Configuring ejabberd 20.03 or older

Here are the main entry points to learn more about ejabberd configuration. ejabberd is extremely powerful and can be configured in many ways with many options.

Do not let this complexity scare you. Most of you will be fine with default config file (or light changes).

Config File Formatting

Yaml Configuration File Format

The configuration file will be loaded the first time you start ejabberd. The configuration file name MUST have “.yml” or “.yaml” extension. This helps ejabberd to differentiate between the new and legacy file formats (see section Legacy Configuration File).

The configuration file is written in YAML.

Note that ejabberd never edits the configuration file. If you are changing parameter from web admin interface, you will need to apply them to configuration file manually. This is to prevent messing up with your config file comments, syntax, etc.

Please, consult ejabberd.log for configuration errors. ejabberd will report syntax related errors, as well as complains about unknown options and invalid values. Make sure you respect indentation (YAML is sensitive to this) or you will get pretty cryptic errors.

Legacy Configuration File

In previous ejabberd version the configuration file should be written in Erlang terms. The format is still supported, but it is highly recommended to convert it to the new YAML format using convert_to_yaml command from ejabberdctl (see ejabberdctl and List of ejabberd Commands for details).

If you want to specify some options using the old Erlang format, you can set them in an additional cfg file, and include it using the include_config_file option, see Include Additional Configuration Files for the option description and a related example in Restrict Execution with AccessCommands.

Configuring One or Several XMPP Domains

Host Names

ejabberd supports managing several independent XMPP domains on a single ejabberd instance, using a feature called virtual hosting.

The option hosts defines a list containing one or more domains that ejabberd will serve.

Of course, the hosts list can contain just one domain if you do not want to host multiple XMPP domains on the same instance.

The syntax is: [HostName1, Hostname2]

Examples:

• Serving one domain:

hosts: [example.org]

• Serving three domains:

  hosts:
    - example.net
    - example.com
    - jabber.somesite.org

Virtual Hosting

When managing several XMPP domains in a single instance, those domains are truly independent. It means they can even have different configuration parameters.

Options can be defined separately for every virtual host using the host_config option.

The syntax is: {HostName: [Option, ...]}

Examples:

• Domain example.net is using the internal authentication method while domain example.com is using the LDAP server running on the domain localhost to perform authentication:

  host_config:
    example.net:
      auth_method: internal
    example.com:
      auth_method: ldap
      ldap_servers:
        - localhost
      ldap_uids:
        - uid
      ldap_rootdn: "dc=localdomain"
      ldap_rootdn: "dc=example,dc=com"
      ldap_password: ""

• Domain example.net is using SQL to perform authentication while domain example.com is using the LDAP servers running on the domains localhost and otherhost:

host_config: example.net: auth_method: sql sql_type: odbc sql_server: "DSN=ejabberd;UID=ejabberd;PWD=ejabberd" example.com: auth_method: ldap ldap_servers: - localhost - otherhost ldap_uids: - uid ldap_rootdn: "dc=localdomain" ldap_rootdn: "dc=example,dc=com" ldap_password: ""

To define specific ejabberd modules in a virtual host, you can define the global modules option with the common modules, and later add specific modules to certain virtual hosts. To accomplish that, instead of defining each option in host_config use append_host_config with the same syntax.

In this example three virtual hosts have some similar modules, but there are also other different modules for some specific virtual hosts:

 ## This ejabberd server has three vhosts:
 hosts:
   - one.example.org
   - two.example.org
   - three.example.org

 ## Configuration of modules that are common to all vhosts
 modules:
   mod_roster:    {}
   mod_configure: {}
   mod_disco:     {}
   mod_private:   {}
   mod_time:      {}
   mod_last:      {}
   mod_version:   {}

 ## Add some modules to vhost one:
 append_host_config:
   one.example.org:
     modules:
       mod_muc:
         host: conference.one.example.org
       mod_ping: {}

 ## Add a module just to vhost two:
 append_host_config:
   two.example.org:
     modules:
       mod_muc:
         host: conference.two.example.org

Basic Configuration

Logging

ejabberd configuration can help a lot by having the right amount of logging set up.

Here is a few general option to configure logging:

loglevel: Number: Verbosity of log files generated by ejabberd. Available levels are.

• 0: No ejabberd log at all (not recommended)
• 1: Critical
• 2: Error
• 3: Warning
• 4: Info
• 5: Debug

log_rotate: size, date and count: The rotation parameters describe how to rotate logs. Either size and/or date can trigger log rotation. Setting count to N keeps N rotated logs. Setting count to 0 does not disable rotation, it instead rotates the file and keeps no previous versions around. Setting size to X rotate log when it reaches X bytes. To disable rotation set the size to 0 and the date to "" Date syntax is taken from the syntax newsyslog uses in newsyslog.conf.

Here are some examples:

• $D0 rotate every night at midnight
• $D23 rotate every day at 23:00 hr
• $W0D23 rotate every week on Sunday at 23:00 hr
• $W5D16 rotate every week on Friday at 16:00 hr
• $M1D0 rotate on the first day of every month at midnight
• $M5D6 rotate on every 5th day of the month at 6:00 hr

The values in default configuration file are:

    log_rotate_size: 0
    log_rotate_date: "$D0"
    log_rotate_count: 1

log_rate_limit: Number: This option is used for overload protection: If you want to limit the number of messages per second allowed from error_logger, which is a good idea if you want to avoid a flood of messages when system is overloaded, you can set a limit. Default value is 100.

For example:

    log_rate_limit: 100

hide_sensitive_log_data: Boolean: We have a privacy option to ensure we do not log IP address or sensitive data. Default value is false for backward compatibility.

For example:

    hide_sensitive_log_data: false

Listening Ports

The option listen defines for which ports, addresses and network protocols ejabberd will listen and what services will be run on them. Each element of the list is an associative array with the following elements:

• Port number. Optionally also the IP address and/or a transport protocol.

• Listening module that serves this port.

• Options for the TCP socket and for the listening module.

The option syntax is:

[Listener, ...]:

Example:

 listen:
   -
     port: 5222
     module: ejabberd_c2s
     starttls: true
   -
     port: 5269
     module: ejabberd_s2s_in
     transport: tcp

Port Number, IP Address and Transport Protocol

The port number defines which port to listen for incoming connections. It can be a Jabber/XMPP standard port or any other valid port number.

The IP address can be represented as a string. The socket will listen only in that network interface. It is possible to specify a generic address ("0.0.0.0" for IPv4 or "::" for IPv6), so ejabberd will listen in all addresses. Depending on the type of the IP address, IPv4 or IPv6 will be used. When the IP address is not specified, it will listen on all IPv4 network addresses.

Note that on some operating systems and/or OS configurations, listening on "::" will mean listening for IPv4 traffic as well as IPv6 traffic.

Some example values for IP address:

• "0.0.0.0" to listen in all IPv4 network interfaces. This is the default value when no IP is specified.

• "::" to listen in all IPv6 network interfaces

• "10.11.12.13" is the IPv4 address 10.11.12.13

• "::FFFF:127.0.0.1" is the IPv6 address ::FFFF:127.0.0.1/128

The transport protocol can be tcp or udp. Default is tcp.

Listening Module

The available modules, their purpose and the options allowed by each one are:

ejabberd_c2s: Handles c2s connections. Options: access, ciphers, dhfile, protocol_options, max_fsm_queue, max_stanza_size, shaper, starttls, starttls_required, tls, zlib, tls_compression

ejabberd_s2s_in: Handles incoming s2s connections. Options: max_stanza_size, shaper, tls_compression

ejabberd_service: Interacts with an external component (as defined in the Jabber Component Protocol (XEP-0114). Options: access, hosts, max_fsm_queue, password, check_from, shaper_rule

ejabberd_sip: Handles SIP requests as defined in RFC 3261. Options: certfile, tls

ejabberd_stun: Handles STUN/TURN requests as defined in RFC 5389 and RFC 5766. Options: certfile, tls, use_turn, turn_ip, turn_port_range, turn_max_allocations, turn_max_permissions, shaper, server_name, auth_realm, auth_type

ejabberd_http: Handles incoming HTTP connections. This module is responsible for serving Web Admin, but also XMPP BOSH and Websocket with proper request handler configured. Options: default_host, dhfile, request_handlers, tls, tls_compression, trusted_proxies (global option)

ejabberd_xmlrpc: Handles XML-RPC requests to execute ejabberd commands. Options: access_commands, maxsessions, timeout. For explanations about access_commands see Restrict Execution with AccessCommands. Check some XML-RPC examples. You can find more information in the old ejabberd_xmlrpc documentation.

Options

This is a detailed description of each option allowed by the listening modules:

access: AccessName: This option defines access to the port. The default value is all.

backlog: Value: The backlog value defines the maximum length that the queue of pending connections may grow to. This should be increased if the server is going to handle lots of new incoming connections as they may be dropped if there is no space in the queue (and ejabberd was not able to accept them immediately). Default value is 5.

ciphers: Ciphers: OpenSSL ciphers list in the same format accepted by ‘openssl ciphers’ command.

protocol_options: ProtocolOpts: List of general options relating to SSL/TLS. These map to OpenSSL’s set_options(). The default entry is: "no_sslv3|cipher_server_preference|no_compression"

default_host: undefined|HostName: If the HTTP request received by ejabberd contains the HTTP header Host with an ambiguous virtual host that doesn’t match any one defined in ejabberd (see Host Names), then this configured HostName is set as the request Host. The default value of this option is: undefined.

dhfile: Path: Full path to a file containing custom parameters for Diffie-Hellman key exchange. Such a file could be created with the command openssl dhparam -out dh.pem 2048. If this option is not specified, default parameters will be used, which might not provide the same level of security as using custom parameters.

hosts: {Hostname: [HostOption, ...]}: The external Jabber component that connects to this ejabberd_service can serve one or more hostnames. As HostOption you can define options for the component; currently the only allowed option is the password required to the component when attempt to connect to ejabberd: password: Secret. Note that you cannot define in a single ejabberd_service components of different services: add an ejabberd_service for each service, as seen in an example below. This option may not be necessary if the component already provides the host in its packets; in that case, you can simply provide the password option that will be used for all the hosts (see port 5236 definition in the example below).

Remember that you must also install and enable the module mod\_bosh, and the ejabberd_c2s listener must be available too.

If HTTP Bind (BOSH) is enabled, it will be available at http://server:port/bosh/. Be aware that support for HTTP Bind is also needed in the XMPP client. Remark also that HTTP Bind can be interesting to host a web-based XMPP client such as JWChat (check the tutorials to install JWChat with ejabberd and an embedded local web server or Apache).

max_fsm_queue: Size: This option specifies the maximum number of elements in the queue of the FSM (Finite State Machine). Roughly speaking, each message in such queues represents one XML stanza queued to be sent into its relevant outgoing stream. If queue size reaches the limit (because, for example, the receiver of stanzas is too slow), the FSM and the corresponding connection (if any) will be terminated and error message will be logged. The reasonable value for this option depends on your hardware configuration. This option can be specified for ejabberd_service and ejabberd_c2s listeners, or also globally for ejabberd_s2s_out. If the option is not specified for ejabberd_service or ejabberd_c2s listeners, the globally configured value is used. The allowed values are integers and ’undefined’. Default value: ’10000’.

max_stanza_size: Size: This option specifies an approximate maximum size in bytes of XML stanzas. Approximate, because it is calculated with the precision of one block of read data. For example {max_stanza_size, 65536}. The default value is infinity. Recommended values are 65536 for c2s connections and 131072 for s2s connections. s2s max stanza size must always much higher than c2s limit. Change this value with extreme care as it can cause unwanted disconnect if set too low.

password: Secret: Specify the password to verify an external component that connects to the port.

request_handlers: {Path: Module}: To define one or several handlers that will serve HTTP requests. The Path is a string; so the URIs that start with that Path will be served by Module. For example, if you want mod_foo to serve the URIs that start with /a/b/, and you also want mod_bosh to serve the URIs /bosh/, use this option:

  request_handlers:
  /a/b: mod_foo
  /bosh: mod_bosh
  /mqtt: mod_mqtt

check_from: true|false: This option can be used with ejabberd_service only. XEP-0114 requires that the domain must match the hostname of the component. If this option is set to false, ejabberd will allow the component to send stanzas with any arbitrary domain in the ’from’ attribute. Only use this option if you are completely sure about it. The default value is true, to be compliant with XEP-0114.

shaper: none|ShaperName: This option defines a shaper for the port (see section Shapers). The default value is none.

shaper_rule: none|ShaperRule: This option defines a shaper rule for the ejabberd_service (see section Shapers). The recommended value is fast.

starttls: true|false: This option specifies that STARTTLS encryption is available on connections to the port. You should also set the certfiles option or configure ACME.

starttls_required: true|false: This option specifies that STARTTLS encryption is required on connections to the port. No unencrypted connections will be allowed. You should also set the certfiles option or configure ACME.

timeout: Integer: Timeout of the connections, expressed in milliseconds. Default: 5000

tls: true|false: This option specifies that traffic on the port will be encrypted using SSL immediately after connecting. This was the traditional encryption method in the early Jabber software, commonly on port 5223 for client-to-server communications. But this method is nowadays deprecated and not recommended. The preferable encryption method is STARTTLS on port 5222, as defined RFC 6120: XMPP Core, which can be enabled in ejabberd with the option starttls. If this option is set, you should also set the certfiles option or configure ACME. The option tls can also be used in ejabberd_http to support HTTPS.

tls_compression: true|false: Whether to enable or disable TLS compression. The default value is false.

use_proxy_protocol: true|false: Is this listener accessed by proxy service that is using proxy protocol for supplying real IP addresses to ejabberd server. You can read about this protocol in Proxy protocol specification. The default value of this option isfalse.

zlib: true|false: This option specifies that Zlib stream compression (as defined in XEP-0138) is available on connections to the port.

Global Options

There are some additional global options that can be specified in the ejabberd configuration file (outside listen):

acme: Automated SSL certificate management. See section ACME.

certfiles: List of paths: The option accepts a list of file paths (optionally with wildcards) containing either PEM certificates or PEM private keys. At startup, ejabberd sorts the certificates, finds matching private keys and rebuilds full certificates chains. Use this option when enabling options like starttls or tls in listeners ejabberd_c2s, ejabberd_s2s or ejabberd_http.

c2s_cafile: Path: Full path to a file containing one or more CA certificates in PEM format. All client certificates should be signed by one of these root CA certificates and should contain the corresponding JID(s) in subjectAltName field.

c2s_ciphers: Ciphers: OpenSSL ciphers list in the same format accepted by ‘openssl ciphers’ command.

c2s_dhfile: Path: Full path to a file containing custom DH parameters. Such a file could be created with the command openssl dhparam -out dh.pem 2048. If this option is not specified, default parameters will be used, which might not provide the same level of security as using custom parameters.

c2s_protocol_options: ProtocolOpts: List of general options relating to SSL/TLS. These map to OpenSSL’s set_options(). The default entry is: "no_sslv3|cipher_server_preference|no_compression"

c2s_tls_compression: true|false: Whether to enable or disable TLS compression for c2s connections. The default value is false.

s2s_use_starttls: false|optional|required|required_trusted: This option defines if s2s connections don’t use STARTTLS encryption; if STARTTLS can be used optionally; if STARTTLS is required to establish the connection; or if STARTTLS is required and the remote certificate must be valid and trusted. Do note that required_trusted is deprecated and will be unsupported in future releases. Instead, set it to required and make sure mod_s2s_dialback is NOT loaded. The default value is to not use STARTTLS: false.

s2s_dhfile: Path: Full path to a file containing custom DH parameters. Such a file could be created with the command openssl dhparam -out dh.pem 2048. If this option is not specified, default parameters will be used, which might not provide the same level of security as using custom parameters.

s2s_ciphers: Ciphers: OpenSSL ciphers list in the same format accepted by ‘openssl ciphers’ command.

s2s_protocol_options: ProtocolOpts: List of general options relating to SSL/TLS. These map to OpenSSL’s set_options(). The default entry is: "no_sslv3|cipher_server_preference|no_compression"

outgoing_s2s_families: [Family, ...]: Specify which address families to try, in what order. By default it first tries connecting with IPv4, if that fails it tries using IPv6.

outgoing_s2s_timeout: Timeout: The timeout in seconds for outgoing S2S connection attempts.

s2s_access: Access: The policy for incoming and outgoing s2s connections to other XMPP servers. The default value is all. You can disable connections to other servers (federation) here by setting it to none, but this will not block other locally hosted servers as, for performance reasons, they are connected internally and not via the s2s module. To block even those you might need to use an additional module, for example mod_isolation.

s2s_dns_timeout: Timeout: The timeout in seconds for DNS resolving. The default value is 10.

s2s_dns_retries: Number: DNS resolving retries in seconds. The default value is 2.

s2s_max_retry_delay: Seconds: The maximum allowed delay for retry to connect after a failed connection attempt. Specified in seconds. The default value is 300 seconds (5 minutes).

s2s_tls_compression: true|false: Whether to enable or disable TLS compression for s2s connections. The default value is false.

trusted_proxies: all | [IpString]: Specify what proxies are trusted when an HTTP request contains the header X-Forwarded-For You can specify all to allow all proxies, or specify a list of IPs in string format. The default value is: ["127.0.0.1"]. This allows, if enabled, to be able to know the real IP of the request, for admin purpose, or security configuration (for example using mod_fail2ban)). Important: The proxy MUST be configured to set the X-Forwarded-For header if you enable this option as, otherwise, the client can set it itself and as a result the IP value cannot be trusted for security rules in ejabberd.

Examples

For example, the following simple configuration defines:

• There are three domains. The default certificate file is server.pem. However, the c2s and s2s connections to the domain example.com use the file example_com.pem.

• Port 5222 listens for c2s connections with STARTTLS, and also allows plain connections for old clients.

• Port 5223 listens for c2s connections with the old SSL.

• Port 5269 listens for s2s connections with STARTTLS. The socket is set for IPv6 instead of IPv4.

• Port 3478 listens for STUN requests over UDP.

• Port 5280 listens for HTTP requests, and serves the HTTP-Bind (BOSH) service.

• Port 5281 listens for HTTP requests, using HTTPS to serve HTTP-Bind (BOSH) and the Web Admin as explained in Managing: Web Admin. The socket only listens connections to the IP address 127.0.0.1.

   hosts:
     - example.com
     - example.org
     - example.net

   certfiles:
     - /etc/ejabberd/server.pem
     - /etc/ejabberd/example_com.pem

   listen:
     -
       port: 5222
       module: ejabberd_c2s
       access: c2s
       shaper: c2s_shaper
       starttls: true
       max_stanza_size: 65536
     -
       port: 5223
       module: ejabberd_c2s
       access: c2s
       shaper: c2s_shaper
       tls: true
       max_stanza_size: 65536
     -
       port: 5269
       ip: "::"
       module: ejabberd_s2s_in
       shaper: s2s_shaper
       max_stanza_size: 131072
     -
       port: 3478
       transport: udp
       module: ejabberd_stun
     -
       port: 5280
       module: ejabberd_http
       request_handlers:
         /bosh: mod_bosh
     -
       port: 5281
       ip: 127.0.0.1
       module: ejabberd_http
       tls: true
       request_handlers:
         /admin: ejabberd_web_admin
         /bosh: mod_bosh

   s2s_use_starttls: optional
   outgoing_s2s_families:
     - ipv4
     - ipv6
   outgoing_s2s_timeout: 10000
   trusted_proxies: [127.0.0.1, 192.168.1.11]

In this example, the following configuration defines that:

• c2s connections are listened for on port 5222 (all IPv4 addresses) and on port 5223 (SSL, IP 192.168.0.1 and fdca:8ab6:a243:75ef::1) and denied for the user called ‘bad’.

• s2s connections are listened for on port 5269 (all IPv4 addresses) with STARTTLS for secured traffic strictly required, and the certificates are verified. Incoming and outgoing connections of remote XMPP servers are denied, only two servers can connect: “jabber.example.org” and “example.com”.

• Port 5280 is serving the Web Admin and the HTTP-Bind (BOSH) service in all the IPv4 addresses. Note that it is also possible to serve them on different ports. The second example in section Managing: Web Admin shows how exactly this can be done. A request handler to serve MQTT over Websocket is also defined.

• All users except for the administrators have a traffic of limit 1,000Bytes/second

• The AIM transport aim.example.org is connected to port 5233 on localhost IP addresses (127.0.0.1 and ::1) with password ‘aimsecret’.

• The ICQ transport JIT (icq.example.org and sms.example.org) is connected to port 5234 with password ‘jitsecret’.

• The MSN transport msn.example.org is connected to port 5235 with password ‘msnsecret’.

• The Yahoo! transport yahoo.example.org is connected to port 5236 with password ‘yahoosecret’.

• The Gadu-Gadu transport gg.example.org is connected to port 5237 with password ‘ggsecret’.

• The Jabber Mail Component jmc.example.org is connected to port 5238 with password ‘jmcsecret’.

• The service custom has enabled the special option to avoiding checking the from attribute in the packets send by this component. The component can send packets in behalf of any users from the server, or even on behalf of any server.

   acl:
     blocked:
       user: bad
     trusted_servers:
       server:
         - example.com
         - jabber.example.org
     xmlrpc_bot:
       user:
         - xmlrpc-robot@example.org
   shaper:
     normal: 1000
   shaper_rules:
     c2s_shaper:
       - none: admin
       - normal
   access_rules:
     c2s:
       - deny: blocked
       - allow
     xmlrpc_access:
       - allow: xmlrpc_bot
     s2s:
       - allow: trusted_servers
   certfiles:
     - /path/to/ssl.pem
   s2s_access: s2s
   s2s_use_starttls: required_trusted
   listen:
     -
       port: 5222
       module: ejabberd_c2s
       shaper: c2s_shaper
       access: c2s
     -
       ip: 192.168.0.1
       port: 5223
       module: ejabberd_c2s
       tls: true
       access: c2s
     -
       ip: "FDCA:8AB6:A243:75EF::1"
       port: 5223
       module: ejabberd_c2s
       tls: true
       access: c2s
     -
       port: 5269
       module: ejabberd_s2s_in
     -
       port: 5280
       module: ejabberd_http
       request_handlers:
         /admin: ejabberd_web_admin
         /bosh: mod_bosh
                              /mqtt: mod_mqtt
     -
       port: 4560
       module: ejabberd_xmlrpc
       access_commands: {}
     -
       ip: 127.0.0.1
       port: 5233
       module: ejabberd_service
       hosts:
         aim.example.org:
           password: aimsecret
     -
       ip: "::1"
       port: 5233
       module: ejabberd_service
       hosts:
         aim.example.org:
           password: aimsecret
     -
       port: 5234
       module: ejabberd_service
       hosts:
         icq.example.org:
           password: jitsecret
         sms.example.org:
           password: jitsecret
     -
       port: 5235
       module: ejabberd_service
       hosts:
         msn.example.org:
           password: msnsecret
     -
       port: 5236
       module: ejabberd_service
       password: yahoosecret
     -
       port: 5237
       module: ejabberd_service
       hosts:
         gg.example.org:
           password: ggsecret
     -
       port: 5238
       module: ejabberd_service
       hosts:
         jmc.example.org:
           password: jmcsecret
     -
       port: 5239
       module: ejabberd_service
       check_from: false
       hosts:
         custom.example.org:
           password: customsecret

Note, that for services based in jabberd14 or WPJabber you have to make the transports log and do XDB by themselves:

 <!--
       You have to add elogger and rlogger entries here when using ejabberd.
       In this case the transport will do the logging.
    -->

 <log id='logger'>
   <host/>
   <logtype/>
   <format>%d: [%t] (%h): %s</format>
   <file>/var/log/jabber/service.log</file>
 </log>

 <!--
       Some XMPP server implementations do not provide
       XDB services (for example, jabberd2 and ejabberd).
       xdb_file.so is loaded in to handle all XDB requests.
    -->

 <xdb id="xdb">
   <host/>
   <load>
     <!-- this is a lib of wpjabber or jabberd14 -->
     <xdb_file>/usr/lib/jabber/xdb_file.so</xdb_file>
     </load>
   <xdb_file xmlns="jabber:config:xdb_file">
     <spool><jabberd:cmdline flag='s'>/var/spool/jabber</jabberd:cmdline></spool>
   </xdb_file>
 </xdb>

ACME

ACME is used to automatically obtain SSL certificates for the domains served by ejabberd, which means that certificate requests and renewals are performed to some CA server (aka "ACME server") in a fully automated mode. The automated mode is enabled by default. However, since ACME requires HTTP challenges (i.e. an ACME server will connect to ejabberd server on HTTP port 80 during certificate issuance), some configuration of ejabberd is still required. Namely, an HTTP listener for ejabberd_http module should be configured on non-TLS port with so called "ACME well known" request handler:

    listen:
      ...
      -
        module: ejabberd_http
        port: 5280
        request_handlers:
          /.well-known/acme-challenge: ejabberd_acme
          ...
      ...

Note that the ACME protocol requires challenges to be sent on port 80. Since this is a privileged port, ejabberd cannot listen on it directly without root privileges. Thus you need some mechanism to forward port 80 to the port defined by the listener (port 5280 in the example above). There are several ways to do this: using NAT, setcap (Linux only), or HTTP front-ends (e.g. sslh, nginx, haproxy and so on). Pick one that fits your installation the best, but DON'T run ejabberd as root.

If you see errors in the logs with ACME server problem reports, it's highly recommended to change ca_url option of section acme to the URL pointing to some staging ACME environment, fix the problems until you obtain a certificate, and then change the URL back and retry using request-certificate ejabberdctl command (see below). This is needed because ACME servers typically have rate limits, preventing you from requesting certificates too rapidly and you can get stuck for several hours or even days. By default, ejabberd uses Let's Encrypt authority. Thus, the default value of ca_url option is https://acme-v02.api.letsencrypt.org/directory and the staging URL will be https://acme-staging-v02.api.letsencrypt.org/directory:

    acme:
      ## Staging environment
      ca_url: https://acme-staging-v02.api.letsencrypt.org/directory
      ## Production environment (the default):
      # ca_url: https://acme-v02.api.letsencrypt.org/directory

The automated mode can be disabled by setting auto option of section acme to false:

    acme:
      auto: false
      ...

In this case automated renewals are still enabled, however, in order to request a new certificate, you need to run request-certificate ejabberdctl command:

`$ ejabberdctl request-certificate all`

If you only want to request certificates for a subset of the domains, run:

`$ ejabberdctl request-certificate domain.tld,pubsub.domain.tld,server.com,conference.server.com,...`

You can view the certificates obtained using ACME:

    $ ejabberdctl list-certificates
    domain.tld /path/to/cert/file1 true
    server.com /path/to/cert/file2 false
    ...

The output is mostly self-explained: every line contains the domain, the corresponding certificate file, and whether this certificate file is used or not. A certificate might not be used for several reasons: mostly because ejabberd detects a better certificate (i.e. not expired, or having a longer lifetime). It's recommended to revoke unused certificates if they are not yet expired (see below).

At any point you can revoke a certificate: pick the certificate file from the listing above and run:

$ ejabberdctl revoke-certificate /path/to/cert/file

If the commands return errors, consult the log files for details.

Available ACME options

ca_url: The ACME directory URL used as an entry point for the ACME server. The default value is https://acme-v02.api.letsencrypt.org/directory - the directory URL of Let's Encrypt authority.

contact: A list of contact addresses (typically emails) where an ACME server will send notifications when problems occur. The default is an empty list which means an ACME server will send no notices.

auto: Whether to automatically request certificates for all configured domains (that yet have no a certificate) on server start or configuration reload. The default is true.

cert_type: A type of a certificate key. Available values are ec and rsa for EC and RSA certificates respectively. It's better to have RSA certificates for the purpose of backward compatibility with legacy clients and servers, thus the default is rsa.

Example:

    acme:
      ca_url: https://acme-v02.api.letsencrypt.org/directory
      contact:
        - mailto:admin@domain.tld
        - mailto:bot@domain.tld
      auto: true
      cert_type: rsa

ACME implementation details

In nutshell, certification requests are performed in two phases. Firstly, ejabberd creates an account at the ACME server. That is an EC private key. Secondly, a certificate is requested. In the case of a revocation, no account is used - only a cerificate in question is needed. All information is stored under acme directory inside spool directory of ejabberd (typically /var/lib/ejabberd). An example content of the directory is the following:

$ tree /var/lib/ejabberd
/var/lib/ejabberd
├── acme
│   ├── account.key
│   └── live
│       ├── 251ce180d964e98a2f18b65504df2ab7c55943e2
│       └── 93816a8429ebbaa75574eb3f59d4a806b67d6917
...

Here, account.key is the EC private key used to identify the ACME account. You can inspect its content using openssl command:

openssl ec -text -noout -in /var/lib/ejabberd/acme/account.key

Obtained certificates are stored under acme/live directory. You can inspect any of the certificates using openssl command as well:

openssl x509 -text -noout -in /var/lib/ejabberd/acme/live/251ce180d964e98a2f18b65504df2ab7c55943e2

In the case of errors, you can delete the whole acme directory - ejabberd will recreate its content on next certification request. However, don't delete it too frequently - usually there is a rate limit on the number of accounts and certificates an ACME server creates. In particular, for Let's Encrypt the limits are described here.

Authentication

The option auth_method defines the authentication methods that are used for user authentication. The syntax is:

[Method, ...] :

The following authentication methods are supported by ejabberd:

• internal — See section Internal.

• external — See section External Script.

• ldap — See section  LDAP.

• sql — See section Relational Databases.

• anonymous — See section Anonymous Login and SASL Anonymous.

• pam — See section Pam Authentication.

When the option is omitted, ejabberd will rely upon the default database which is configured in default_db option. If this option is not set neither the default authentication method will be internal.

Account creation is only supported by internal, external and sql methods.

The option resource_conflict defines the action when a client attempts to login to an account with a resource that is already connected. The option syntax is:

resource_conflict: setresource|closenew|closeold: The possible values match exactly the three possibilities described in XMPP Core: section 7.7.2.2. The default value is closeold. If the client uses old Jabber Non-SASL authentication (XEP-0078), then this option is not respected, and the action performed is closeold.

fqdn: undefined|FqdnString|[FqdnString]: Allows you to define the Fully Qualified Domain Name of the machine, in case it isn't detected automatically. The FQDN is used to authenticate some clients that use the DIGEST-MD5 SASL mechanism.

disable_sasl_mechanisms: Mechanism|[Mechanism, ...]: Specify a list of SASL mechanisms (such as "DIGEST-MD5", "SCRAM-SHA1" or "X-OAUTH2") that should not be offered to the client. The mechanisms can be listed as lowercase or uppercase strings.

Internal

ejabberd uses its internal Mnesia database as the default authentication method. The value internal will enable the internal authentication method.

The option auth_password_format: plain|scram defines in what format the users passwords are stored:

plain: The password is stored as plain text in the database. This is risky because the passwords can be read if your database gets compromised. This is the default value. This format allows clients to authenticate using: the old Jabber Non-SASL (XEP-0078), SASL PLAIN, SASL DIGEST-MD5, and SASL SCRAM-SHA-1.

scram: The password is not stored, only some information that allows to verify the hash provided by the client. It is impossible to obtain the original plain password from the stored information; for this reason, when this value is configured it cannot be changed to plain anymore. This format allows clients to authenticate using: SASL PLAIN and SASL SCRAM-SHA-1.

For details about the client-server communication when using SCRAM-SHA-1, refer to SASL and SCRAM-SHA-1.

When you enable SCRAM password format for internal storage, if you try to authenticate a user that had their password already stored in plain text, their password will be automatically converted to SCRAM format. It means database is converted as you use it.

If you want to convert your Mnesia database all at once, you can look into the Erlang function: ejabberd_auth_internal:maybe_scram_passwords/0.

Examples:

• To use internal authentication on example.org and LDAP authentication on example.net:

  host_config:
    example.org:
      auth_method: [internal]
    example.net:
      auth_method: [ldap]

• To use internal authentication with hashed passwords on all virtual hosts:

  auth_method: internal
  auth_password_format: scram

Note on SCRAM using and foreign authentication limitations: when using the SCRAM password format, it is not possible to use foreign authentication method in ejabberd, as the real password is not known, Foreign authentication are use to authenticate through various bridges ejabberd provide. Foreign authentication includes at the moment SIP and TURN auth support and they will not be working with SCRAM.

External Script

In this authentication method, when ejabberd starts, it start a script, and calls it to perform authentication tasks.

The server administrator can write the external authentication script in any language. The details on the interface between ejabberd and the script are described in the ejabberd Developers Guide. There are also several example authentication scripts.

These are the specific options:

extauth_program: PathToScript: Indicate in this option the full path to the external authentication script. The script must be executable by ejabberd.

extauth_instances: Integer: Indicate how many instances of the script to run simultaneously to serve authentication in the virtual host. The default value is the minimum number: 1.

auth_use_cache: false|true: Starting in ejabberd 17.06, caching has received a complete overhaul. Instead of extauth_cache, a set of new variables describes cache behaviour, and the default value is now true. Note that caching interferes with the ability to maintain multiple passwords per account. So if your authentication mechanism supports application-specific passwords, caching must be disabled. The options are called auth_use_cache, auth_cache_missed, auth_cache_size, auth_cache_life_time, and you can see details in the section Caching.

This example sets external authentication, the extauth script, enables caching for 10 minutes, and starts three instances of the script for each virtual host defined in ejabberd:

 auth_method: [external]
 extauth_program: /etc/ejabberd/JabberAuth.class.php
 extauth_instances: 3
 auth_use_cache: false

Anonymous Login and SASL Anonymous

The anonymous authentication method enables two modes for anonymous authentication:

Anonymous login: This is a standard login, that use the classical login and password mechanisms, but where password is accepted or preconfigured for all anonymous users. This login is compliant with SASL authentication, password and digest non-SASL authentication, so this option will work with almost all XMPP clients

SASL Anonymous: This is a special SASL authentication mechanism that allows to login without providing username or password (see XEP-0175). The main advantage of SASL Anonymous is that the protocol was designed to give the user a login. This is useful to avoid in some case, where the server has many users already logged or registered and when it is hard to find a free username. The main disavantage is that you need a client that specifically supports the SASL Anonymous protocol.

The anonymous authentication method can be configured with the following options. Remember that you can use the host_config option to set virtual host specific options (see section Virtual Hosting).

allow_multiple_connections: false|true: This option is only used when the anonymous mode is enabled. Setting it to true means that the same username can be taken multiple times in anonymous login mode if different resource are used to connect. This option is only useful in very special occasions. The default value is false.

anonymous_protocol: login_anon | sasl_anon | both: login_anon means that the anonymous login method will be used. sasl_anon means that the SASL Anonymous method will be used. both means that SASL Anonymous and login anonymous are both enabled.

Those options are defined for each virtual host with the host_config parameter (see section  Virtual Hosting).

Examples:

• To enable anonymous login on all virtual hosts:

  auth_method: [anonymous]
  anonymous_protocol: login_anon

• Similar as previous example, but limited to public.example.org:

  host_config:
    public.example.org:
      auth_method: [anonymous]
      anonymous_protoco: login_anon

• To enable anonymous login and internal authentication on a virtual host:

  host_config:
    public.example.org:
      auth_method:
        - internal
        - anonymous
      anonymous_protocol: login_anon

• To enable SASL Anonymous on a virtual host:

  host_config:
    public.example.org:
      auth_method: [anonymous]
      anonymous_protocol: sasl_anon

• To enable SASL Anonymous and anonymous login on a virtual host:

  host_config:
    public.example.org:
      auth_method: [anonymous]
      anonymous_protocol: both

• To enable SASL Anonymous, anonymous login, and internal authentication on a virtual host:

  host_config:
    public.example.org:
      auth_method:
        - internal
        - anonymous
      anonymous_protocol: both

There are more configuration examples and XMPP client example stanzas in Anonymous users support.

PAM Authentication

ejabberd supports authentication via Pluggable Authentication Modules (PAM). PAM is currently supported in AIX, FreeBSD, HP-UX, Linux, Mac OS X, NetBSD and Solaris. PAM authentication is disabled by default, so you have to configure and compile ejabberd with PAM support enabled:

./configure --enable-pam && make install

Options:

pam_service: Name: This option defines the PAM service name. Default is ejabberd. Refer to the PAM documentation of your operation system for more information.

pam_userinfotype: username|jid: This option defines what type of information about the user ejabberd provides to the PAM service: only the username, or the user JID. Default is username.

Example:

 auth_method: [pam]
 pam_service: ejabberd

Though it is quite easy to set up PAM support in ejabberd, PAM itself introduces some security issues:

• To perform PAM authentication ejabberd uses external C-program called epam. By default, it is located in /var/lib/ejabberd/priv/bin/ directory. You have to set it root on execution in the case when your PAM module requires root privileges (pam_unix.so for example). Also you have to grant access for ejabberd to this file and remove all other permissions from it. Execute with root privileges:

  chown root:ejabberd /var/lib/ejabberd/priv/bin/epam
  chmod 4750 /var/lib/ejabberd/priv/bin/epam

• Make sure you have the latest version of PAM installed on your system. Some old versions of PAM modules cause memory leaks. If you are not able to use the latest version, you can kill(1) epam process periodically to reduce its memory consumption: ejabberd will restart this process immediately.

• epam program tries to turn off delays on authentication failures. However, some PAM modules ignore this behavior and rely on their own configuration options. You can create a configuration file ejabberd.pam. This example shows how to turn off delays in pam_unix.so module:

  #%PAM-1.0
  auth        sufficient  pam_unix.so likeauth nullok nodelay
  account     sufficient  pam_unix.so

That is not a ready to use configuration file: you must use it as a

hint when building your own PAM configuration instead. Note that if you want to disable delays on authentication failures in the PAM configuration file, you have to restrict access to this file, so a malicious user can’t use your configuration to perform brute-force attacks.

• You may want to allow login access only for certain users. pam_listfile.so module provides such functionality.

• If you use pam_winbind to authorise against a Windows Active Directory, then /etc/nsswitch.conf must be configured to use winbind as well.

JWT Authentication

ejabberd supports authentication using JSON Web Token (JWT). When enabled, clients send signed tokens instead of passwords, which are checked using a private key specified in the jwt_key option. JWT payload must look like this:

    {
      "jid": "test@example.org",
      "exp": 1564436511
    }
 ```

Options:

**`jwt_key: Path`**:   Full path to a file containing the JWT private key.

**`jwt_auth_only_rule: AccessName`**:   The accounts that match this access rule can authenticate only using JWT, even if ejabberd is configured to support other auth methods too.

Example:
``` yaml
 auth_method: jwt
 jwt_key: /path/to/jwt/key

In this example, admins can use both JWT and plain passwords, while the rest of users can use only JWT.

 # the order is important here, don't use [sql, jwt]
 auth_method: [jwt, sql]

 access_rules:
   ...
   jwt_only:
     deny: admin
     allow: all

 jwt_auth_only_rule: jwt_only

Access Rules

This section describes new ACL syntax introduced in ejabberd 16.06. For old access rule and ACL syntax documentation, please refer to configuration document archive

ACL Definition

Access control in ejabberd is performed via Access Control Lists (ACLs). The declarations of ACLs in the configuration file have the following syntax:

acl: { ACLName: { ACLType: ACLValue } }

ACLType: ACLValue can be one of the following:

all: Matches all JIDs. Example:

     acl:
       world: all

user: Username: Matches the user with the name Username on any of the local virtual host. Example:

     acl:
       admin:
         user: yozhik

user: {Username: Server} | Jid: Matches the user with the JID Username@Server and any resource. Example:

     acl:
       admin:
         - user:
             yozhik@example.org
         - user: peter@example.org

server: Server: Matches any JID from server Server. Example:

      acl:
       exampleorg:
         server: example.org

resource: Resource: Matches any JID with a resource Resource. Example:

     acl:
       mucklres:
         resource: muckl

shared_group: Groupname: Matches any member of a Shared Roster Group with name Groupname in the virtual host. Example:

     acl:
       techgroupmembers:
         shared_group: techteam

shared_group: {Groupname: Server}: Matches any member of a Shared Roster Group with name Groupname in the virtual host Server. Example:

     acl:
       techgroupmembers:
         shared_group:
           techteam: example.org

ip: Network: Matches any IP address from the Network. Example:

     acl:
       loopback:
         ip:
           - 127.0.0.0/8
           - "::1"

user_regexp: Regexp: Matches any local user with a name that matches Regexp on local virtual hosts. Example:

     acl:
       tests:
         user_regexp: "^test[0-9]*$"

user_regexp: {Regexp: Server} | JidRegexp: Matches any user with a name that matches Regexp at server Server. Example:

     acl:
       tests:
         user_regexp:
           - "^test1": example.org
           - "^test2@example.org"

server_regexp: Regexp: Matches any JID from the server that matches Regexp. Example:

     acl:
       icq:
         server_regexp: "^icq\\."

resource_regexp: Regexp: Matches any JID with a resource that matches Regexp. Example:

     acl:
       icq:
         resource_regexp: "^laptop\\."

node_regexp: {UserRegexp: ServerRegexp}: Matches any user with a name that matches UserRegexp at any server that matches ServerRegexp. Example:

     acl:
       yozhik:
         node_regexp:
           "^yozhik$": "^example.(com|org)$"

user_glob: Glob:

user_glob: {Glob: Server}:

server_glob: Glob:

resource_glob: Glob:

node_glob: {UserGlob: ServerGlob}: This is the same as above. However, it uses shell glob patterns instead of regexp. These patterns can have the following special characters:

• *: matches any string including the null string.

• ?: matches any single character.

• [...]: matches any of the enclosed characters. Character ranges are specified by a pair of characters separated by a -. If the first character after [ is a !, any character not enclosed is matched.

The following ACLName are pre-defined:

all: Matches any JID.

none: Matches no JID.

Access Rights

An entry allowing or denying access to different services. The syntax is:

access_rules: { AccessName: { - allow|deny: ACLRule|ACLDefinition } }

Each definition may contain arbitrary number of - allow or - deny sections, and each section can contain any number of acl rules (as defined in previous section, it recognizes one additional rule acl: RuleName that matches when acl rule named RuleName matches). If no rule or definition is defined, the rule all is applied.

Definition's - allow and - deny sections are processed in top to bottom order, and first one for which all listed acl rules matches is returned as result of access rule. If no rule matches deny is returned.

To simplify configuration two shortcut version are available: - allow: acl and - allow, example below shows equivalent definitions where short or long version are used:

    access_rules:
      a_short: admin
      a_long:
        - acl: admin
      b_short:
        - deny: banned
        - allow
      b_long:
        - deny:
          - acl: banned
        - allow:
          - all

If you define specific Access rights in a virtual host, remember that the globally defined Access rights have precedence over those. This means that, in case of conflict, the Access granted or denied in the global server is used and the Access of a virtual host doesn't have effect.

Example:

      access_rules:
        configure:
          - allow: admin
        something:
          - deny: someone
          - allow
        s2s_banned:
          - deny: problematic_hosts
          - deny:
            - acl: banned_forever
          - deny:
            - ip: 222.111.222.111/32
          - deny:
            - ip: 111.222.111.222/32
          - allow
        xmlrpc_access:
          - allow:
            - user: peter@example.com
          - allow:
            - user: ivone@example.com
          - allow:
            - user: bot@example.com
            - ip: 10.0.0.0/24

The following AccessName are pre-defined:

all: Always returns the value ‘allow’.

none: Always returns the value ‘deny’.

Shaper Rules

An entry allowing to declaring shaper to use for matching user/hosts. The syntax is:

shaper_rules: { ShaperRuleName: { - Number|ShaperName: ACLRule|ACLDefinition } }

Semantic is similar to that described in Access Rights section, only difference is that instead using - allow or - deny, name of shaper or number should be used.

Examples:

shaper_rules:
  connections_limit:
    - 10:
      - user: peter@example.com
    - 100: admin
    - 5
  download_speed:
    - fast: admin
    - slow: anonymous_users
    - normal
  log_days: 30

Limiting Opened Sessions with ACL

The special access max_user_sessions specifies the maximum number of sessions (authenticated connections) per user. If a user tries to open more sessions by using different resources, the first opened session will be disconnected. The error session replaced will be sent to the disconnected session. The value for this option can be either a number, or infinity. The default value is infinity.

The syntax is:

{ max_user_sessions: { - Number: ACLRule|ACLDefinition } }

This example limits the number of sessions per user to 5 for all users, and to 10 for admins:

shaper_rules: max_user_sessions: - 10: admin - 5

Several connections to a remote XMPP server with ACL

The special access max_s2s_connections specifies how many simultaneous S2S connections can be established to a specific remote XMPP server. The default value is 1. There’s also available the access max_s2s_connections_per_node.

The syntax is:

{ max_s2s_connections: { ACLName: MaxNumber } }

Examples:

• Allow up to 3 connections with each remote server:

shaper_rules: max_s2s_connections: 3

Shapers

Shapers enable you to limit connection traffic. The syntax is:

shaper: { ShaperName: Rate }: where Rate stands for the maximum allowed incoming rate in bytes per second. When a connection exceeds this limit, ejabberd stops reading from the socket until the average rate is again below the allowed maximum.

Examples:

• To define a shaper named ‘normal’ with traffic speed limited to 1,000bytes/second:

shaper: normal: 1000

• To define a shaper named ‘fast’ with traffic speed limited to 50,000bytes/second:

shaper: fast: 50000

Default Language

The option language defines the default language of server strings that can be seen by XMPP clients. If a XMPP client does not support xml:lang, the specified language is used.

The option syntax is:

language: Language: The default value is en. In order to take effect there must be a translation file Language.msg in ejabberd’s msgs directory.

For example, to set Russian as default language:

language: ru

The page Internationalization and Localization provides more details.

CAPTCHA

Some ejabberd modules can be configured to require a CAPTCHA challenge on certain actions. If the client does not support CAPTCHA Forms (XEP-0158), a web link is provided so the user can fill the challenge in a web browser.

An example script is provided that generates the image using ImageMagick’s Convert program.

Info

We do not provide example scripts to support image generation on Microsoft Windows. Captcha will not work with ejabberd Windows installer.

The configurable options are:

captcha_cmd: Path: Full path to a script that generates the image. The default value disables the feature: undefined

captcha_url: URL: An URL where CAPTCHA requests should be sent. You need to configure request_handlers for ejabberd_http listener as well.

Example configuration:

hosts: [example.org]

captcha_cmd: /lib/ejabberd/priv/bin/captcha.sh captcha_url: http://example.org:5280/captcha ## captcha_url: https://example.org:443/captcha ## captcha_url: http://example.com/captcha

listen: ... - port: 5280 module: ejabberd_http request_handlers: /captcha: ejabberd_captcha ...

Node settings

net_ticktime: 60

This option can be used to tune tick time parameter of net_kernel. It tells erlang VM how often nodes should check if intra-node communication was not interrupted. This option must have identical value on all nodes, or it will lead to subtle bugs. Usually leaving default value of this is option is best, tweak it only if you know what you are doing.

STUN and TURN

ejabberd is able to act as a stand-alone STUN/TURN server (RFC 5389/RFC 5766). In that role ejabberd helps clients with ICE (RFC 5245) or Jingle ICE (XEP-0176) support to discover their external addresses and ports and to relay media traffic when it is impossible to establish direct peer-to-peer connection.

You should configure ejabberd_stun listening module as described in Listening Module section. The specific configurable options are:

tls: true|false: If enabled, certfile option must be set, otherwise ejabberd will not be able to accept TLS connections. Obviously, this option makes sense for tcp transport only. The default is false.

certfile: Path: Path to the certificate file. Only makes sense when tls is set.

use_turn: true|false: Enables/disables TURN (media relay) functionality. The default is false.

turn_ip: String: The IPv4 address advertised by your TURN server. The address should not be NAT’ed or firewalled. There is not default, so you should set this option explicitly. Implies use_turn.

turn_min_port: Integer: Together with turn_max_port forms port range to allocate from. The default is 49152. Implies use_turn.

turn_max_port: Integer: Together with turn_min_port forms port range to allocate from. The default is 65535. Implies use_turn.

turn_max_allocations: Integer|infinity: Maximum number of TURN allocations available from the particular IP address. The default value is 10. Implies use_turn.

turn_max_permissions: Integer|infinity: Maximum number of TURN permissions available from the particular IP address. The default value is 10. Implies use_turn.

auth_type: user|anonymous: Which authentication type to use for TURN allocation requests. When type user is set, ejabberd authentication backend is used. For anonymous type no authentication is performed (not recommended for public services). The default is user. Implies use_turn.

auth_realm: String: When auth_type is set to user and you have several virtual hosts configured you should set this option explicitly to the virtual host you want to serve on this particular listening port. Implies use_turn.

shaper: Atom: For tcp transports defines shaper to use. The default is none.

server_name: String: Defines software version to return with every response. The default is the STUN library version.

Example configuration with disabled TURN functionality (STUN only):

listen: ... - port: 3478 transport: udp module: ejabberd_stun - port: 3478 module: ejabberd_stun - port: 5349 module: ejabberd_stun certfile: /etc/ejabberd/server.pem ...

Example configuration with TURN functionality. Note that STUN is always enabled if TURN is enabled. Here, only UDP section is shown:

listen: ... - port: 3478 transport: udp use_turn: true turn_ip: 10.20.30.1 module: ejabberd_stun ...

You also need to configure DNS SRV records properly so clients can easily discover a STUN/TURN server serving your XMPP domain. Refer to section DNS Discovery of a Server of RFC 5389 and section Creating an Allocation of RFC 5766 for details.

Example DNS SRV configuration for STUN only:

_stun._udp IN SRV 0 0 3478 stun.example.com. _stun._tcp IN SRV 0 0 3478 stun.example.com. _stuns._tcp IN SRV 0 0 5349 stun.example.com.

And you should also add these in the case if TURN is enabled:

_turn._udp IN SRV 0 0 3478 turn.example.com. _turn._tcp IN SRV 0 0 3478 turn.example.com. _turns._tcp IN SRV 0 0 5349 turn.example.com.

SIP

SIP Configuration

ejabberd has built-in SIP support. In order to activate it you need to add listeners for it, configure DNS properly and enable mod_sip for the desired virtual host.

To add a listener you should configure ejabberd_sip listening module as described in Listening Module section. If option tls is specified, option certfile must be specified as well, otherwise incoming TLS connections would fail.

Example configuration with standard ports (as per RFC 3261):

listen: ... - port: 5060 transport: udp module: ejabberd_sip - port: 5060 module: ejabberd_sip - port: 5061 module: ejabberd_sip tls: true certfile: /etc/ejabberd/server.pem ...

Note that there is no StartTLS support in SIP and SNI support is somewhat tricky, so for TLS you have to configure different virtual hosts on different ports if you have different certificate files for them.

Next you need to configure DNS SIP records for your virtual domains. Refer to RFC 3263 for the detailed explanation. Simply put, you should add NAPTR and SRV records for your domains. Skip NAPTR configuration if your DNS provider doesn't support this type of records. It’s not fatal, however, highly recommended.

Example configuration of NAPTR records:

example.com IN NAPTR 10 0 "s" "SIPS+D2T" "" _sips._tcp.example.com. example.com IN NAPTR 20 0 "s" "SIP+D2T" "" _sip._tcp.example.com. example.com IN NAPTR 30 0 "s" "SIP+D2U" "" _sip._udp.example.com.

Example configuration of SRV records with standard ports (as per RFC 3261):

_sip._udp IN SRV 0 0 5060 sip.example.com. _sip._tcp IN SRV 0 0 5060 sip.example.com. _sips._tcp IN SRV 0 0 5061 sip.example.com.

Note on SIP usage

SIP authentication does not support SCRAM. As such, it is not possible to use mod_sip to authenticate when ejabberd has been set to encrypt password with SCRAM.

Include Additional Configuration Files

The option include_config_file in a configuration file instructs ejabberd to include other configuration files immediately.

The basic syntax is:

include_config_file: [Filename]

It is possible to specify suboptions using the full syntax:

include_config_file: { Filename: [Suboption, ...] }: The filename can be indicated either as an absolute path, or relative to the main ejabberd configuration file. It isn't possible to use wildcards. The file must exist and be readable.

The allowed suboptions are:

disallow: [Optionname, ...]: Disallows the usage of those options in the included configuration file. The options that match this criteria are not accepted. The default value is an empty list: []

allow_only: [Optionname, ...]: Allows only the usage of those options in the included configuration file. The options that do not match this criteria are not accepted. The default value is: all

This is a basic example:

include_config_file: /etc/ejabberd/additional.yml

In this example, the included file is not allowed to contain a listen option. If such an option is present, the option will not be accepted. The file is in a subdirectory from where the main configuration file is.

include_config_file: ./example.org/additional_not_listen.yml: disallow: [listen]

Please notice that options already defined in the main configuration file cannot be redefined in the included configuration files. But you can use host_config and append_host_config as usual (see Virtual Hosting).

In this example, ejabberd.yml defines some ACL for the whole ejabberd server, and later includes another file:

acl: admin: user: - admin@localhost include_config_file: /etc/ejabberd/acl.yml

The file acl.yml can add additional administrators to one of the virtual hosts:

append_host_config: localhost: acl: admin: user: - bob@localhost - jan@localhost

Option Macros in Configuration File

In the ejabberd configuration file, it is possible to define a macro for a value and later use this macro when defining an option.

A macro is defined with this syntax:

define_macro: { ’MACRO’: Value }: Defines a macro. The value can be any valid arbitrary YAML value. For convenience, it's recommended to define a macro name in capital letters.

Duplicated macros are not allowed.

Macros are processed after additional configuration files have been included, so it is possible to use macros that are defined in configuration files included before the usage.

It is possible to use a macro in the definition of another macro.

This example shows the basic usage of a macro:

define_macro: LOG_LEVEL_NUMBER: 5 loglevel: LOG_LEVEL_NUMBER

The resulting option interpreted by ejabberd is: loglevel: 5.

This example shows that values can be any arbitrary YAML value:

define_macro: USERBOB: user: - bob@localhost acl: admin: USERBOB

The resulting option interpreted by ejabberd is:

acl: admin: user: - bob@localhost

This complex example:

define_macro: NUMBER_PORT_C2S: 5222 NUMBER_PORT_HTTP: 5280 listen: - port: NUMBER_PORT_C2S module: ejabberd_c2s - port: NUMBER_PORT_HTTP module: ejabberd_http

produces this result after being interpreted:

listen: - port: 5222 module: ejabberd_c2s - port: 5280 module: ejabberd_http

Database and LDAP Configuration

ejabberd uses its internal Mnesia database by default. However, it is possible to use a relational database, key-value storage or an LDAP server to store persistent, long-living data. ejabberd is very flexible: you can configure different authentication methods for different virtual hosts, you can configure different authentication mechanisms for the same virtual host (fallback), you can set different storage systems for modules, and so forth.

The following databases are supported by ejabberd:

• Mnesia

• MySQL

• Any ODBC compatible database

• PostgreSQL

• MS SQL Server/SQL Azure

• SQLite

• Redis (only for transient data)

The following LDAP servers are tested with ejabberd:

• Active Directory (see section Active Directory)

• OpenLDAP

• CommuniGate Pro

• Normally any LDAP compatible server should work; inform us about your success with a not-listed server so that we can list it here.

Important note about virtual hosting: if you define several domains in ejabberd.yml (see section Host Names), you probably want that each virtual host uses a different configuration of database, authentication and storage, so that usernames do not conflict and mix between different virtual hosts. For that purpose, the options described in the next sections must be set inside a host_config for each vhost (see section Virtual Hosting). For example:

host_config: public.example.org: sql_type: pgsql sql_server: localhost sql_database: database-public-example-org sql_username: ejabberd sql_password: password auth_method: [sql]

Relational Databases

There are two schemas usable for ejabberd. The default lecacy schema allows to store one XMPP domain into one ejabberd database. The 'new' schema allows to handle several XMPP domains in a single ejabberd database. Using this new schema is best when serving several XMPP domains and/or changing domains from time to time. This avoid need to manage several databases and handle complex configuration changes.

You need to upload SQL schema to your SQL server. Choose the one from this list. If you are using MySQL and choose the default schema, use mysql.sql. If you are using PostgreSQL and need the new schema, use pg.new.sql.

If you choose the new schema, you MUST add an extra line into ejabberd.yml configuration file to enable the feature:

new_sql_schema: true

The actual database access is defined in the options with sql_ prefix. The values are used to define if we want to use ODBC, or one of the two native interface available, PostgreSQL or MySQL.

The following parameters are available:

sql_type: mysql | pgsql | odbc | mssql | sqlite: The type of an SQL connection. The default is odbc.

sql_server: String: A hostname of the SQL server. The default is localhost.

sql_port: Port: The port where the SQL server is accepting connections. The option is valid for mysql, pgsql and mssql. The default is 3306 and 5432 respectively.

sql_database: String: The database name. The default is ejabberd. The option is valid for mysql, pgsql and mssql.

sql_username: String: The username. The default is ejabberd. The option is valid for mysql, pgsql and mssql.

sql_password: String: The password. The default is empty string. The option is valid for mysql, pgsql and mssql.

sql_ssl: Boolean: use ssl if not set plain tcp. The default value is false. The option is valid for pgsql and mysql.

sql_ssl_verify: Boolean: if set verify ssl connect. The default value is false. The option is valid for pgsql.

sql_ssl_cafile: String: The path to a CA certificate file. By default the option is not set. The option is valid for pgsql.

sql_ssl_certfile: String: The path to a client/authentication certificate file. By default the option is not set. The option is valid for pgsql.

sql_pool_size: N: By default ejabberd opens 10 connections to the database for each virtual host. You can change this number by using this option.

sql_keepalive_interval: N: You can configure an interval to make a dummy SQL request to keep alive the connections to the database. The default value is ’undefined’, so no keepalive requests are made. Specify in seconds: for example 28800 means 8 hours.

sql_start_interval: N: If the connection to the database fails, ejabberd waits 30 seconds before retrying. You can modify this interval with this option.

sql_prepared_statements: Boolean: If you need to disable prepared statements. The default value is true. The option is valid for pgsql and mysql.

Example of plain ODBC connection:

sql_server: "DSN=database;UID=ejabberd;PWD=password"

Example of MySQL connection:

sql_type: mysql sql_server: server.company.com sql_port: 3306 # the default sql_database: mydb sql_username: user1 sql_password: "****" sql_pool_size: 5

Microsoft SQL Notes

For now, MS SQL is only supported in Unix-like OS'es. You need to have FreeTDS and unixODBC installed on your machine. Also, in some cases you need to add machine name to sql_username, especially when you have sql_server defined as an IP address, e.g.:

sql_type: mssql sql_server: 1.2.3.4 ... sql_username: user1@host

SQL Authentication

You can authenticate users against an SQL database, see the option auth_method in section Authentication.

The option auth_password_format is supported, for details see section Internal. Please note that if you use SQL auth method and set SCRAM format, old plain passwords that may be stored in the database are not automatically scrammed. For that, you can execute the command:

ejabberdctl convert_to_scram example.org

SQL Storage

An ODBC compatible database also can be used to store information into from several ejabberd modules. See section Modules Overview to see which modules can be used with relational databases like MySQL. To enable storage to your database, just make sure that your database is running well (see previous sections), and add the module option db_type: sql or set default_db: sql globally if you want to use SQL for all modules.

LDAP

ejabberd has built-in LDAP support. You can authenticate users against LDAP server and use LDAP directory as vCard storage.

Usually ejabberd treats LDAP as a read-only storage: it is possible to consult data, but not possible to create accounts or edit vCard that is stored in LDAP. However, it is possible to change passwords if mod_register module is enabled and LDAP server supports RFC 3062.

LDAP Connection

Two connections are established to the LDAP server per vhost, one for authentication and other for regular calls.

Parameters:

ldap_servers: [Servers, ...]: List of IP addresses or DNS names of your LDAP servers. This option is required.

ldap_encrypt: none|tls: Type of connection encryption to the LDAP server. Allowed values are: none, tls. The value tls enables encryption by using LDAP over SSL. Note that STARTTLS encryption is not supported. The default value is: none.

ldap_tls_verify: false|soft|hard: This option specifies whether to verify LDAP server certificate or not when TLS is enabled. When hard is enabled ejabberd doesn’t proceed if a certificate is invalid. When soft is enabled ejabberd proceeds even if check fails. The default is false which means no checks are performed.

ldap_tls_cacertfile: Path: Path to file containing PEM encoded CA certificates. This option is needed (and required) when TLS verification is enabled.

ldap_tls_depth: Number: Specifies the maximum verification depth when TLS verification is enabled, i.e. how far in a chain of certificates the verification process can proceed before the verification is considered to fail. Peer certificate = 0, CA certificate = 1, higher level CA certificate = 2, etc. The value 2 thus means that a chain can at most contain peer cert, CA cert, next CA cert, and an additional CA cert. The default value is 1.

ldap_port: Number: Port to connect to your LDAP server. The default port is 389 if encryption is disabled; and 636 if encryption is enabled. If you configure a value, it is stored in ejabberd’s database. Then, if you remove that value from the configuration file, the value previously stored in the database will be used instead of the default port.

ldap_rootdn: RootDN: Bind DN. The default value is empty string "" which means ‘anonymous connection’.

ldap_password: Password: Bind password. The default value is is empty string.

ldap_deref_aliases: never|always|finding|searching: Whether or not to dereference aliases. The default is never.

Example:

auth_method: [ldap] ldap_servers: - ldap1.example.org ldap_port: 389 ldap_rootdn: "cn=Manager,dc=domain,dc=org" ldap_password: "****"

LDAP Authentication

You can authenticate users against an LDAP directory. Note that current LDAP implementation does not support SASL authentication.

Available options are:

ldap_base: Base: LDAP base directory which stores users accounts. This option is required.

ldap_uids: [ ldap_uidattr | {ldap_uidattr: ldap_uidattr_format} ]: LDAP attribute which holds a list of attributes to use as alternatives for getting the JID. The default attributes are [{uid, %u}]. The attributes are of the form: [{ldap_uidattr}] or [{ldap_uidattr, ldap_uidattr_format}]. You can use as many comma separated attributes as needed. The values for ldap_uidattr and ldap_uidattr_format are described as follow:

• ldap_uidattr: LDAP attribute which holds the user’s part of a JID. The default value is uid.

• ldap_uidattr_format: Format of the ldap_uidattr variable. The format must contain one and only one pattern variable %u which will be replaced by the user’s part of a JID. For example, %u@example.org. The default value is %u.

ldap_filter: Filter: RFC 4515 LDAP filter. The default Filter value is: undefined. Example: (&(objectClass=shadowAccount)(memberOf=Jabber Users)). Please, do not forget to close brackets and do not use superfluous whitespaces. Also you must not use ldap_uidattr attribute in filter because this attribute will be substituted in LDAP filter automatically.

ldap_dn_filter: { Filter: FilterAttrs }: This filter is applied on the results returned by the main filter. This filter performs additional LDAP lookup to make the complete result. This is useful when you are unable to define all filter rules in ldap_filter. You can define %u, %d, %s and %D pattern variables in Filter: %u is replaced by a user’s part of a JID, %d is replaced by the corresponding domain (virtual host), all %s variables are consecutively replaced by values of FilterAttrs attributes and %D is replaced by Distinguished Name. By default ldap_dn_filter is undefined. Example:

 ldap_dn_filter:
   "(&(name=%s)(owner=%D)(user=%u@%d))": [sn]

Since this filter makes additional LDAP lookups, use it only in the last resort: try to define all filter rules in ldap_filter if possible.

LDAP Examples

Common example

Let’s say ldap.example.org is the name of our LDAP server. We have users with their passwords in ou=Users,dc=example,dc=org directory. Also we have addressbook, which contains users emails and their additional infos in ou=AddressBook,dc=example,dc=org directory. The connection to the LDAP server is encrypted using TLS, and using the custom port 6123. Corresponding authentication section should looks like this:

## Authentication method auth_method: [ldap] ## DNS name of our LDAP server ldap_servers: [ldap.example.org] ## Bind to LDAP server as "cn=Manager,dc=example,dc=org" with password "secret" ldap_rootdn: "cn=Manager,dc=example,dc=org" ldap_password: secret ldap_encrypt: tls ldap_port: 6123 ## Define the user's base ldap_base: "ou=Users,dc=example,dc=org" ## We want to authorize users from 'shadowAccount' object class only ldap_filter: "(objectClass=shadowAccount)"

Now we want to use users LDAP-info as their vCards. We have four attributes defined in our LDAP schema: mail — email address, givenName — first name, sn — second name, birthDay — birthday. Also we want users to search each other. Let’s see how we can set it up:

modules: ... mod_vcard: db_type: ldap ## We use the same server and port, but want to bind anonymously because ## our LDAP server accepts anonymous requests to ## "ou=AddressBook,dc=example,dc=org" subtree. ldap_rootdn: "" ldap_password: "" ## define the addressbook's base ldap_base: "ou=AddressBook,dc=example,dc=org" ## uidattr: user's part of JID is located in the "mail" attribute ## uidattr_format: common format for our emails ldap_uids: mail: "%u@mail.example.org" ## We have to define empty filter here, because entries in addressbook does not ## belong to shadowAccount object class ldap_filter: "" ## Now we want to define vCard pattern ldap_vcard_map: NICKNAME: {"%u": []} # just use user's part of JID as their nickname GIVEN: {"%s": [givenName]} FAMILY: {"%s": [sn]} FN: {"%s, %s": [sn, givenName]} # example: "Smith, John" EMAIL: {"%s": [mail]} BDAY: {"%s": [birthDay]}]} ## Search form ldap_search_fields: User: "%u" Name: givenName "Family Name": sn Email: mail Birthday: birthDay ## vCard fields to be reported ## Note that JID is always returned with search results ldap_search_reported: "Full Name": FN Nickname: NICKNAME Birthday: BDAY ...

Note that mod_vcard with LDAP backend checks for the existence of the user before searching their information in LDAP.

Active Directory

Active Directory is just an LDAP-server with predefined attributes. A sample configuration is shown below:

auth_method: [ldap] ldap_servers: [office.org] # List of LDAP servers ldap_base: "DC=office,DC=org" # Search base of LDAP directory ldap_rootdn: "CN=Administrator,CN=Users,DC=office,DC=org" # LDAP manager ldap_password: "*" # Password to LDAP manager ldap_uids: [sAMAccountName] ldap_filter: "(memberOf=*)"

modules: ... mod_vcard: db_type: ldap ldap_vcard_map: NICKNAME: {"%u": []} GIVEN: {"%s": [givenName]} MIDDLE: {"%s": [initials]} FAMILY: {"%s": [sn]} FN: {"%s": [displayName]} EMAIL: {"%s": [mail]} ORGNAME: {"%s": [company]} ORGUNIT: {"%s": [department]} CTRY: {"%s": [c]} LOCALITY: {"%s": [l]} STREET: {"%s": [streetAddress]} REGION: {"%s": [st]} PCODE: {"%s": [postalCode]} TITLE: {"%s": [title]} URL: {"%s": [wWWHomePage]} DESC: {"%s": [description]} TEL: {"%s": [telephoneNumber]}]} ldap_search_fields: User: "%u" Name: givenName "Family Name": sn Email: mail Company: company Department: department Role: title Description: description Phone: telephoneNumber ldap_search_reported: "Full Name": FN Nickname: NICKNAME Email: EMAIL ...

Redis

Redis is an advanced key-value cache and store. You can use it to store transient data, such as records for C2S (client) sessions. There are several options available:

redis_server: String: A hostname of the Redis server. The default is localhost.

redis_port: Port: The port where the Redis server is accepting connections. The default is 6379.

redis_password: String: The password to the Redis server. The default is an empty string, i.e. no password.

redis_db: N: Redis database number. The default is 0.

redis_connect_timeout: N: A number of seconds to wait for the connection to be established to the Redis server. The default is 1 second.

Example configuration:

redis_server: redis.server.com redis_db: 1

Default database configuration

You can simplify the configuration by setting the default database. This can be done with default_db option:

default_db: mnesia|sql: This will define the default database for a module lacking db_type option or if auth_method option is not set.

Session Management

By default pointers to C2S sessions are kept in Mnesia. You may want to use another database backend for this. The option is:

sm_db_type: mnesia|sql|redis: Note that for sql or redis you should have them configured. See sections Relational Databases or Redis.

Modules Configuration

The option modules defines the list of modules that will be loaded after ejabberd’s startup. Each entry in the list is a tuple in which the first element is the name of a module and the second is a list of options for that module.

The syntax is:

modules: { ModuleName: ModuleOptions }

Examples:

• In this example only the module mod_muc is loaded and no module options are specified between the square brackets:

modules: mod_muc: {}

• In the second example the modules mod_muc, mod_time, and mod_version are loaded without options.

modules: mod_muc: {} mod_time: {} mod_version: {}

Modules Overview

The following table lists all modules included in ejabberd.

Module	Feature	Dependencies
mod_adhoc	Ad-Hoc Commands (XEP-0050)
mod_announce	Manage announcements	recommends mod_adhoc
mod_block_strangers	Block packets from non-subscribers
mod_blocking	Simple Communications Blocking (XEP-0191)	mod_privacy
mod_bosh	BOSH (XEP-0124) and XMPP over BOSH (XEP-0206)	ejabberd_c2s listener
mod_caps	Entity Capabilities (XEP-0115)
mod_carboncopy	Message Carbons (XEP-0280)
mod_client_state	Filter stanzas for inactive clients
mod_configure	Server configuration using Ad-Hoc	mod_adhoc
mod_delegation	Namespace Delegation (XEP-0355)
mod_disco	Service Discovery (XEP-0030)
mod_fail2ban	Bans IPs that show the malicious signs
mod_http_api	REST API for ejabberd using JSON data
mod_http_fileserver	Small HTTP file server
mod_http_upload	HTTP File Upload (XEP-0363)
mod_http_upload_quota	HTTP File Upload Quotas	mod_http_upload
mod_jidprep	JID Prep (XEP-0328)
mod_last	Last Activity (XEP-0012)
mod_mam	Message Archive Management (XEP-0313)	mod_mam
mod_mix	Mediated Information eXchange (XEP-0369)	mod_pubsub
mod_metrics	Simple metrics handler for runtime statistics
mod_muc	Multi-User Chat (XEP-0045)
mod_muc_admin	Administrative commands for Multi-User Chat	mod_muc
mod_muc_log	Multi-User Chat room logging	mod_muc
mod_multicast	Extended Stanza Addressing (XEP-0033)
mod_offline	Offline message storage (XEP-0160)
mod_ping	XMPP Ping and periodic keepalives (XEP-0199)
mod_pres_counter	Detect presence subscription flood
mod_privacy	Blocking Communication (XEP-0016)
mod_private	Private XML Storage (XEP-0049)
mod_privilege	Privileged Entity (XEP-0356)
mod_proxy65	SOCKS5 Bytestreams (XEP-0065)
mod_pubsub	Pub-Sub (XEP-0060), PEP (XEP-0163)	mod_caps
mod_push	Push Notifications (XEP-0357)
mod_push_keepalive	Keep sessions of push clients alive	mod_push
mod_register	In-Band Registration (XEP-0077)
mod_register_web	Web for Account Registrations
mod_roster	Roster management (XMPP IM)
mod_s2s_dialback	Server Dialback (XEP-0220)
mod_service_log	Copy user messages to logger service
mod_shared_roster	Shared roster management	mod_roster
mod_shared_roster_ldap	LDAP Shared roster management	mod_roster
mod_sic	Server IP Check (XEP-0279)
mod_sip	SIP Registrar/Proxy (RFC 3261)	ejabberd_sip
mod_stats	Statistics Gathering (XEP-0039)
mod_stream_mgmt	Stream Management (XEP-0198)
mod_time	Entity Time (XEP-0202)
mod_vcard	vcard-temp (XEP-0054)
mod_vcard_xupdate	vCard-Based Avatars (XEP-0153)	mod_vcard
mod_version	Software Version (XEP-0092)

• (*) This module requires a supported database. For a list of supported databases, see section Database and LDAP Configuration.

You can see which database backend each module needs by looking at the suffix:

• No suffix, this means that the module uses Erlang’s built-in database Mnesia as backend or SQL database (see Database and LDAP Configuration).

• ‘_ldap’, this means that the module needs an LDAP server as backend.

You can find more contributed modules on the ejabberd website. Please remember that these contributions might not work or that they can contain severe bugs and security leaks. Therefore, use them at your own risk!

Common Options

The following options are used by many modules. Therefore, they are described in this separate section.

host

This option defines the Jabber ID of a service provided by an ejabberd module.

The syntax is:

host: HostName:

If you include the keyword “@HOST@” in the HostName, it is replaced at start time with the real virtual host string.

This example configures the MUC module to provide its service in the Jabber ID conference.example.org:

modules: ... mod_muc: host: conference.example.org ...

However, if there are several virtual hosts and this module is enabled in all of them, the “@HOST@” keyword must be used:

modules: ... mod_muc: host: "conference.@HOST@" ...

Caching

There are several global options to enable caching and configure its behaviour:

use_cache: false|true: Enable or disable cache. The default is true.

cache_missed: false|true: Whether or not to cache missed lookups. When there is an attempt to lookup for a value in a database and this value is not found and the option is set to true, this attempt will be cached and no attempts will be performed until the cache expires. Usually you don't want to change it. Default is true.

cache_size: Items|infinity: A maximum number of items (not memory!) in cache. The rule of thumb, for all tables except rosters, you should set it to the number of maximum online users you expect. For roster multiply this number by 20 or so. If the cache size reaches this threshold, it's fully cleared, i.e. all items are deleted, and the corresponding warning is logged. You should avoid frequent cache clearance, because this degrades performance. The default value is 1000.

cache_life_time: Seconds|infinity: The time (in seconds) of a cached item to keep in cache. Once it's expired, the corresponding item is erased from cache. The default value is 3600 seconds, that is one hour.

These options can also be defined specifically in several modules. Additionally, some core ejabberd parts support those options, like auth, oauth, router and sm. In those cases, please prepend the option names with the part name, for example router_use_cache, or sm_cache_size.

mod_admin_extra

Available option:

module_resource: Resource: Indicate the resource that the XMPP stanzas must use in the FROM or TO JIDs. This is only useful in the vcard set and get commands. The default value is "mod_admin_extra".

In this example configuration, the users vCards can only be modified by executing mod_admin_extra commands:

acl:
  adminextraresource:
    - resource: "modadminextraf8x,31ad"
access_rules:
  vcard_set:
    - allow: adminextraresource
modules:
  mod_admin_extra:
    module_resource: "modadminextraf8x,31ad"
  mod_vcard:
    access_set: vcard_set

Description of some commands:

pushroster: The file used by pushroster and pushroster-all must be placed: - Windows: on the directory were you installed ejabberd: C:/Program Files/ejabberd - Other OS: on the same directory where the .beam files are. Example content for the roster file:

[{<<"bob">>, <<"example.org">>, <<"workers">>, <<"Bob">>}, {<<"mart">>, <<"example.org">>, <<"workers">>, <<"Mart">>}, {<<"Rich">>, <<"example.org">>, <<"bosses">>, <<"Rich">>}].

srg-create: If you want to put a group Name with blankspaces, use the characters "' and '" to define when the Name starts and ends. For example:

ejabberdctl srg-create g1 example.org "'Group number 1'" this_is_g1 g1

ban-account: This command kicks all the connected sessions of the account from the server. It also changes their password to a randomly generated one, so they can't login anymore unless a server administrator changes their password again.

It is possible to define the reason of the ban. The new password also includes the reason and the date and time of the ban.

For example, if this command is called:

ejabberdctl vhost example.org ban-account boby Spammed several MUC rooms

then the sessions of the local account which JID is boby@example.org will be kicked, and its password will be set to something like this:

BANNED_ACCOUNT--20080425T21:45:07--2176635--Spammed_several_MUC_rooms

mod_announce

This module enables configured users to broadcast announcements and to set the message of the day (MOTD). Configured users can perform these actions with a XMPP client either using Ad-hoc commands or sending messages to specific JIDs.

The Ad-hoc commands are listed in the Server Discovery. For this feature to work, mod_adhoc must be enabled.

The specific JIDs where messages can be sent are listed below. The first JID in each entry will apply only to the specified virtual host example.org, while the JID between brackets will apply to all virtual hosts in ejabberd.

example.org/announce/all (example.org/announce/all-hosts/all): The message is sent to all registered users. If the user is online and connected to several resources, only the resource with the highest priority will receive the message. If the registered user is not connected, the message will be stored offline in assumption that offline storage (see section  mod_offline) is enabled.

example.org/announce/online (example.org/announce/all-hosts/online): The message is sent to all connected users. If the user is online and connected to several resources, all resources will receive the message.

example.org/announce/motd (example.org/announce/all-hosts/motd): The message is set as the message of the day (MOTD) and is sent to users when they login. In addition the message is sent to all connected users (similar to announce/online).

example.org/announce/motd/update (example.org/announce/all-hosts/motd/update): The message is set as message of the day (MOTD) and is sent to users when they login. The message is not sent to any currently connected user.

example.org/announce/motd/delete (example.org/announce/all-hosts/motd/delete): Any message sent to this JID removes the existing message of the day (MOTD).

Options:

db_type: mnesia|sql: Define the type of storage where the module will create the tables and store user information. The default is the storage defined by the global option default_db, or mnesia if omitted. If sql value is defined, make sure you have defined the database, see database.

use_cache: false|true: Use this option and related ones as explained in section Caching.

access: AccessName: This option specifies who is allowed to send announcements and to set the message of the day (by default, nobody is able to send such messages).

Examples:

• Only administrators can send announcements:

access_rules: announce: - allow: admin

modules: ... mod_adhoc: {} mod_announce: access: announce ...

• Administrators as well as the direction can send announcements:

acl: direction: user: big_boss@example.org assistant@example.org admin: user: admin@example.org access_rules: announce: - allow: admin - allow: direction

modules: ... mod_adhoc: {} mod_announce: access: announce ...

Note that mod_announce can be resource intensive on large deployments as it can broadcast lot of messages. This module should be disabled for instances of ejabberd with hundreds of thousands users.

mod_block_strangers

This module allows to block/log messages coming from an unknown entity. If a writing entity is not in your roster, you can let this module drop and/or log the message. By default you'll just not receive message from that entity. Enable this module if you want to drop SPAM messages.

Options:

drop: true|false: This option specifies if strangers messages should be dropped or not. The default value is true.

log: true|false: This option specifies if strangers messages should be logged (as info message) in ejabberd logs. The default value is false.

allow_local_users: true|false: This option specifies if strangers from the same local host should be accepted or not. The default value is true.

allow_transports: true|false: If set to true and some server's JID is in user's roster, then messages from any user of this server are accepted even if no subscription present. The default value is true.

captcha: true|false: Whether to generate CAPTCHA or not in response to messages from strangers. See also section CAPTCHA. The default value is false.

mod_bosh

This module implements XMPP over BOSH as defined in XEP-0124 and XEP-0206. BOSH stands for Bidirectional-streams Over Synchronous HTTP. It makes it possible to simulate long lived connections required by XMPP over HTTP protocol. In practice, this module makes it possible to use XMPP in a browser without Websocket support and more generally to have a way to use XMPP while having to get through an HTTP proxy.

Enabling BOSH support

mod_bosh extends ejabberd’s built in HTTP service with a configurable resource at which this service will be hosted.

To use XMPP over BOSH, enable the module:

modules: ... mod_bosh: {} ...

and add mod_bosh in the HTTP listener service, together with ejabberd_c2s. For example:

listen: - port: 5222 module: ejabberd_c2s max_stanza_size: 65536 shaper: c2s_shaper access: c2s ... - port: 5280 module: ejabberd_http request_handlers: /bosh: mod_bosh /admin: ejabberd_web_admin ...

With this configuration, the module will serve the requests sent to http://example.org:5280/bosh/

Please, remember that this page is not designed to be used by web browsers, it is used by XMPP clients that support XMPP over BOSH.

Options

• {max_inactivity, Seconds}: Define the maximum inactivity period in seconds. Default value is 30 seconds. For example, to set 50 seconds:

  modules: ... mod_bosh: max_inactivity: 50 ...

• use_cache: false|true: Use this option and related ones as explained in section Caching.

Discovery

You also need to configure DNS SRV records properly so clients can easily discover a BOSH server serving your XMPP domain. Refer to XEP-0156.

Example DNS TXT configuration for BOSH:

_xmppconnect IN TXT "[ _xmpp-client-xbosh=https://web.example.org:5280/bosh ]"

mod_client_state

This module allows for queueing certain types of stanzas when a client indicates that the user is not actively using the client right now (see XEP-0352). This can save bandwidth and resources.

A stanza is dropped from the queue if it's effectively obsoleted by a new one (e.g., a new presence stanza would replace an old one from the same client). The queue is flushed if a stanza arrives that won't be queued, or if the queue size reaches a certain limit (currently 100 stanzas), or if the client becomes active again.

Options:

queue_chat_states: true|false: Queue “standalone” chat state notifications (as defined in XEP-0085) while a client indicates inactivity. The default value is true.

queue_pep: true|false: Queue PEP notifications while a client is inactive. When the queue is flushed, only the most recent notification of a given PEP node is delivered. The default value is true.

queue_presence: true|false: While a client is inactive, queue presence stanzas that indicate (un)availability. The default value is true.

Example:

modules: ... mod_client_state: queue_chat_states: true queue_pep: false queue_presence: true ...

mod_delegation

This module is an implementation of (XEP-0355). Only admin mode has been implemented by now. Namespace delegation allows external services to handle IQ using specific namespace. This may be applied for external PEP service.

Example:

To use the module add mod_delegation to modules section. If you want to delegate namespaces to a component, specify them in the namespaces option, and associate them to a access rule, e.g.:

module: ... mod_delegation: namespaces: "urn:xmpp:mam:1": filtering: [node] access: external_mam "http://jabber.org/protocol/pubsub": access: external_pubsub ...

You'll also have to define the access rules to allow the component to handle the namespaces:

access_rules: ... external_pubsub: - allow: external_component external_mam: - allow: external_component

acl: ... external_component: server: - sat-pubsub.example.org

In the example above sat-pubsub.example.org will receive all pubsub requests and all MAM requests with the node filtering attribute presented in <query/>.

Make sure you do not delegate the same namespace to several services at the same time. As in the example above to have the sat-pubsub.example.org component perform correctly disable the mod_pubsub module.

Security issue

Namespace delegation gives components access to sensitive data, so permission should be granted carefully, only if you trust the component.

Note

This module is complementary to mod_privilege (XEP-0356) but can also be used separately.

mod_disco

This module adds support for Service Discovery (XEP-0030). With this module enabled, services on your server can be discovered by XMPP clients. Note that ejabberd has no modules with support for the superseded Jabber Browsing (XEP-0011) and Agent Information (XEP-0094). Accordingly, XMPP clients need to have support for the newer Service Discovery protocol if you want them be able to discover the services you offer.

Options:

extra_domains: [Domain, ...]: With this option, you can specify a list of extra domains that are added to the Service Discovery item list.

server_info: [ { modules: Modules, name: Name, urls: [URL, ...] } ]: Specify additional information about the server, as described in Contact Addresses for XMPP Services (XEP-0157). Modules can be the keyword ‘all’, in which case the information is reported in all the services; or a list of ejabberd modules, in which case the information is only specified for the services provided by those modules. Any arbitrary Name and URL can be specified, not only contact addresses.

Examples:

• To serve a link to the Jabber User Directory on jabber.org:

modules: ... mod_disco: extra_domains: [users.jabber.org] ...

• To serve a link to the transports on another server:

modules: ... mod_disco: extra_domains: - icq.example.com - msn.example.com ...

• To serve a link to a few friendly servers:

modules: ... mod_disco: extra_domains: - example.org - example.com ...

• With this configuration, all services show abuse addresses, feedback address on the main server, and admin addresses for both the main server and the vJUD service:

modules: ... mod_disco: server_info: - modules: all name: abuse-addresses urls: [mailto:abuse@shakespeare.lit] - modules: [mod_muc] name: "Web chatroom logs" urls: [http://www.example.org/muc-logs] - modules: [mod_disco] name: feedback-addresses urls: - http://shakespeare.lit/feedback.php - mailto:feedback@shakespeare.lit - xmpp:feedback@shakespeare.lit - modules: - mod_disco - mod_vcard name: admin-addresses urls: - mailto:xmpp@shakespeare.lit - xmpp:admins@shakespeare.lit ...

mod_fail2ban

The module bans IPs that show the malicious signs. Currently only C2S authentication failures are detected.

Unlike the fail2ban standalone program, mod_fail2ban clears the record of authentication failures c2s_auth_ban_lifetime seconds after the first failure or on a successful authentication. It also does not simply block network traffic, but provides the client with a descriptive error message.

Available options:

c2s_auth_ban_lifetime: Seconds: The lifetime of the IP ban caused by too many C2S authentication failures. The default is 3600, i.e. one hour.

c2s_max_auth_failures: Integer: The number of C2S authentication failures to trigger the IP ban. The default is 20.

access: AccessName: Specify an access rule for whitelisting IP addresses or networks. If the rule returns ‘allow’ for a given IP address, that address will never be banned. The AccessName should be of type ip. The default value is none.

Example:

modules: ... mod_fail2ban: c2s_auth_ban_lifetime: 7200 c2s_max_auth_failures: 50 ...

Warning: You should not use mod_fail2ban behind a proxy or load balancer. ejabberd will see the failures as coming from the load balancer and, when the threshold of auth failures is reached, will reject all connections coming from the load balancer. You can lock all your user base out of ejabberd when using mod_fail2ban behind a proxy.

mod_http_api

This module provides a ReST API to call ejabberd commands using JSON data.

To start using it, simply add it as a request handler, for example:

listen: - port: 5280 module: ejabberd_http request_handlers: /api: mod_http_api

To use a specific API version N, add a vN element in the URL path, like:

   /api/v2: mod_http_api

Access rights are defined with those global options:

commands_admin_access: configure commands: - add_commands: user

add_commands allows exporting a class of commands, from

• open: methods that are not risky and can be called without any access check

• restricted: the same, but will appear only in ejabberdctl list. This is the default.

• admin: auth is required with XMLRPC and HTTP API and checked for admin privileges, works as usual in ejabberdctl.

• user: can be used through XMLRPC and HTTP API, even by user. Only admin can use the commands for other users.

Then, to run a command, send a POST request to the following URL: http://localhost:5280/api/<command_name>

It's also possible to enable unrestricted access to some commands from group of IP addresses by using option admin_ip_access by having fragment like this in configuration file:

modules: mod_http_api: admin_ip_access: admin_ip_access_rule

access: admin_ip_access_rule: admin_ip_acl: - command1 - command2 ## use all to give access to all commands

acl: admin_ip_acl: ip: - 127.0.0.1/8

mod_http_fileserver

This simple module serves files from the local disk over HTTP.

Options:

docroot: Path: Directory to serve the files.

accesslog: Path: File to log accesses using an Apache-like format. No log will be recorded if this option is not specified.

directory_indices: [Index, ...]: Indicate one or more directory index files, similarly to Apache’s DirectoryIndex variable. When a web request hits a directory instead of a regular file, those directory indices are looked in order, and the first one found is returned.

custom_headers: {Name: Value}: Indicate custom HTTP headers to be included in all responses. Default value is: []

content_types: {Name: Type}: Specify mappings of extension to content type. There are several content types already defined, with this option you can add new definitions, modify or delete existing ones. To delete an existing definition, simply define it with a value: ‘undefined’.

default_content_type: Type: Specify the content type to use for unknown extensions. Default value is ‘application/octet-stream’.

This example configuration will serve the files from the local directory /var/www in the address http://example.org:5280/pub/archive/. In this example a new content type ogg is defined, png is redefined, and jpg definition is deleted. To use this module you must enable it:

modules: ... mod_http_fileserver: docroot: /var/www accesslog: /var/log/ejabberd/access.log directory_indices: - index.html - main.htm custom_headers: X-Powered-By: Erlang/OTP X-Fry: "It's a widely-believed fact!" content_types: .ogg: audio/ogg .png: image/png .jpg: undefined default_content_type: text/html ...

And define it as a handler in the HTTP service:

listen: ... - port: 5280 module: ejabberd_http request_handlers: ... /pub/archive: mod_http_fileserver ... ...

mod_http_upload

This module allows for requesting permissions to upload a file via HTTP as described in XEP-0363. If the request is accepted, the client receives a URL for uploading the file and another URL from which that file can later be downloaded.

In order to use this module, it must be configured as a request_handler for an ejabberd_http listener.

Options:

host: HostName: This option defines the JID for the HTTP upload service. The keyword “@HOST@” is replaced with the virtual host name. Default: upload.@HOST@.

name: Text: This option defines the Service Discovery name for the HTTP upload service. Default: HTTP File Upload.

access: AccessName: This option defines the access rule to limit who is permitted to use the HTTP upload service. The default value is local. If no access rule of that name exists, no user will be allowed to use the service.

max_size: Size: This option limits the acceptable file size. Either a number of bytes (larger than zero) or infinity must be specified. Default: 104857600.

secret_length: Length: This option defines the length of the random string included in the GET and PUT URLs generated by mod_http_upload. The minimum length is 8 characters, but it is recommended to choose a larger value. Default: 40.

jid_in_url: node|sha1: When this option is set to node, the node identifier of the user's JID (i.e., the user name) is included in the GET and PUT URLs generated by mod_http_upload. Otherwise, a SHA-1 hash of the user's bare JID is included instead. Default: sha1.

thumbnail: true|false: This option specifies whether ejabberd should create thumbnails of uploaded images. If a thumbnail is created, a <thumbnail/> element that contains the download <uri/> and some metadata is returned with the PUT response. Default: false.

file_mode: Mode: This option defines the permission bits of uploaded files. The bits are specified as an octal number (see the chmod(1) manual page) within double quotes. For example: "0644". Default: undefined.

dir_mode: Mode: This option defines the permission bits of the docroot directory and any directories created during file uploads. The bits are specified as an octal number (see the chmod(1) manual page) within double quotes. For example: "0755". Default: undefined.

docroot: Path: Uploaded files are stored below the directory specified (as an absolute path) with this option. The keyword @HOME@ is replaced with the home directory of the user running ejabberd, and the keyword @HOST@ with the virtual host name. Default: "@HOME@/upload".

put_url: URL: This option specifies the initial part of the PUT URLs used for file uploads. The keyword @HOST@ is replaced with the virtual host name. Default: "https://@HOST@:5443". Note: Different virtual hosts cannot use the same PUT URL.

get_url: URL: This option specifies the initial part of the GET URLs used for downloading the files. By default, it is set to the same value as the put_url. The keyword @HOST@ is replaced with the virtual host name. Note: If GET requests are handled by mod_http_upload, the get_url must match the put_url. Setting it to a different value only makes sense if an external web server or mod_http_fileserver is used to serve the uploaded files.

service_url: URL: WARNING: The service_url option is deprecated and will be unsupported in future releases, better use the external_secret option instead. If a service_url is specified, upload slot requests are forwarded to this external service instead of being handled by mod_http_upload itself. Whenever an upload slot request is accepted as per the access rule, a HTTP GET query with jid, name, size, and content_type fields is issued. In order to accept the request, the service must return an HTTP status code of 200 or 201 and two lines of text/plain output. The first line is forwarded to the XMPP client as the PUT URL, the second line as the GET URL. In order to reject the request, the service should return a status code of 402 (resource-constraint), 403 (not-allowed), or 413 (not-acceptable). Default: undefined.

custom_headers: {Name: Value}: This option specifies additional header fields to be included in all HTTP responses. Default: [].

rm_on_unregister: true|false: This option specifies whether files uploaded by a user should be removed when that user is unregistered. Default: true.

external_secret: "text": This option makes it possible to offload all HTTP Upload processing to a separate HTTP server. Both ejabberd and the HTTP server should share this secret and behave exactly as described at Prosody's mod_http_upload_external in the 'Implementation' section. Default: undefined.

Example:

certfiles: - /etc/ejabberd/certificate.pem

listen: ... - port: 5443 module: ejabberd_http tls: true request_handlers: ... upload: mod_http_upload ... ...

modules: ... mod_http_upload: docroot: /ejabberd/upload put_url: "https://@HOST@:5443/upload" ...

And using a separate HTTP server to host the files:

modules: ... mod_http_upload: put_url: https://separate.http.server/upload external_secret: "foo bar baz" ...

mod_http_upload_quota

This module adds quota support for mod_http_upload.

Options:

max_days: Days: If a number larger than zero is specified, any files (and directories) older than this number of days are removed from the subdirectories of the docroot directory, once per day. Default: infinity.

access_hard_quota: AccessName: This option defines which access rule is used to specify the "hard quota" for the matching JIDs. That rule must yield a positive number for any JID that is supposed to have a quota limit. This is the number of megabytes a corresponding user may upload. When this threshold is exceeded, ejabberd deletes the oldest files uploaded by that user until their disk usage equals or falls below the specified soft quota (see below).

access_soft_quota: AccessName: This option defines which access rule is used to specify the "soft quota" for the matching JIDs. That rule must yield a positive number of megabytes for any JID that is supposed to have a quota limit. See the description of the access_hard_quota option for details.

Note: It's not necessary to specify the access_hard_quota and access_soft_quota options in order to use the quota feature. You can stick to the default names and just specify access rules such as those in the following example.

shaper_rules: ... soft_upload_quota: - 1000: all # MiB hard_upload_quota: - 1100: all # MiB ...

modules: ... mod_http_upload: {} mod_http_upload_quota: max_days: 100 ...

ejabberd_http_ws

This module enables XMPP communication over Websocket connection as described in RFC 7395.

Enabling Websocket support

To enable this module it must have handler added to request_handlers section of ejabberd_http listener:

listen: ... - port: 5280 module: ejabberd_http request_handlers: ... /xmpp: ejabberd_http_ws ... ...

This module can be configured by using those options that should be placed in general section of config file:

• websocket_origin: ignore|URL: This option enables validation for "Origin" header to protect against connections from other domains than given in config. In this way, the lower layer load balancer can get chosen for a specific ejabberd implementation while still providing a secure websocket connection. Default value of this option is ignore. Example value of URL: "https://test.example.org:8081"

• websocket_ping_interval: Seconds: Defines time between pings send by server to client (Websocket level protocol pings are used for this) to keep connection active. If client won't respond to two corresponding pings connection will be assumed as closed. Value of 0 can be used to disable it feature. This options do make server send pings only for connections using rfc compliant protocol, for older style connections server expects that whitespace pings would be used for this purpose. Default value of this option is set to 60.

• websocket_timeout: Seconds: Amount of time without any communication after which connection would be closed. The specified number of seconds must be larger than 0. This option is set to 300 by default.

Discovery

You also need to configure DNS SRV records properly so clients can easily discover Websocket service for your XMPP domain. Refer to XEP-0156.

Example DNS TXT configuration for Websocket:

_xmppconnect IN TXT "[ _xmpp-client-websocket=wss://web.example.com:443/ws ]"

Testing Websocket

A test client can be found on Github: Websocket test client

mod_jidprep

This module allows XMPP clients to ask the server to normalize a JID as per the rules specified in RFC 6122: XMPP Address Format. This might be useful for clients in certain constrained environments, or for testing purposes.

Options:

access: AccessName: This option defines which access rule will be used to control who is allowed to use this service. The default is local.

mod_last

Description

This module adds support for Last Activity (XEP-0012). It can be used to discover when a disconnected user last accessed the server, to know when a connected user was last active on the server, or to query the uptime of the ejabberd server.

Options

db_type: mnesia|sql: Define the type of storage where the module will create the tables and store user information. The default is the storage defined by the global option default_db, or mnesia if omitted. If sql value is defined, make sure you have defined the database, see database.

use_cache: false|true: Use this option and related ones as explained in section Caching.

Example Configuration

modules:
  mod_last: {}

Implementation notes

You may want to disable that module depending on several parameters:

• Privacy: You may not want to store the last presence of your users in database.
• Performance: If you have usage pattern with large spike of disconnect, you may want to disable that module to limit traffic spike on your mod_last database backend.

Note that you may want also to purge last activity that is too old to limit the storage size of those data.

mod_mam

This module implements Message Archive Management as described in XEP-0313. Versions 0.2 and 0.3 are supported at the moment. Compatible XMPP clients can use it to store their chat history on the server.

Options:

assume_mam_usage: true|false: This option determines how ejabberd's stream management code handles unacknowledged messages when the connection is lost. Usually, such messages are either bounced or resent. However, neither is done for messages that were stored in the user's MAM archive if this option is set to true. In this case, ejabberd assumes those messages will be retrieved from the archive. The default is false.

compress_xml: true|false: When enabled, new messages added to archives are compressed using a custom compression algorithm (for details see the ejabberd 18.12 release notes). This feature works only with db_type: sql. The default value is false.

db_type: mnesia|sql: Define the type of storage where the module will create the tables and store user information. The default is the storage defined by the global option default_db, or mnesia if omitted. If sql value is defined, make sure you have defined the database, see database. Note: If mnesia is used, the total size of all MAM archives cannot exceed 2 GB. The delete_old_mam_messages command could be run periodically to make sure the mnesia data won't grow beyond that limit. To support larger archives, sql storage must be used.

default: always|never|roster: The option defines default policy for chat history. When always is set every chat message is stored. With roster only chat history with contacts from user's roster is stored. never fully disables chat history. Note that a client can change its policy via protocol commands. The default is never.

request_activates_archiving: true|false: If this option is enabled, no messages are stored for a user until their client issue a MAM request, regardless of the value of the default option. Once the server received a request, that user's messages are archived as usual. The default is false.

use_cache: false|true: Use this option and related ones as explained in section Caching.

user_mucsub_from_muc_archive: false|true: this option is used to enable storage optimization when using MucSub on large chat rooms along with MAM. The default is false (disabled), to keep former behaviour as default.

mod_mix

This module is an experimental implementation Mediated Information eXchange (MIX) as described in XEP-0369. Our implementation is based on version 0.13.0.

This feature was added in ejabberd 16.03 as an experimental feature, updated in 19.02, and is not yet ready to use in production.

To learn more about how to use that feature, you can refer to our tutorial: Getting started with XEP-0369: Mediated Information eXchange (MIX) v0.1.

mod_metrics

This module sends events to external backend (by now it only supports grapherl). Supported events are: sm_register_connection, sm_remove_connection, user_send_packet, user_receive_packet, s2s_send_packet, s2s_receive_packet, register_user, remove_user, offline_message.

When enabled, every call to these hooks triggers a counter event to the configured backend.

Backend is not configurable yet, by now it requires to be grapherl running in localhost and listening to port 11111.

mod_muc

This module provides a Multi-User Chat (XEP-0045) service. Users can discover existing rooms, join or create them. Occupants of a room can chat in public or have private chats.

Some of the features of Multi-User Chat:

• Sending public and private messages to room occupants.

• Inviting other users to a room.

• Setting a room subject.

• Creating password protected rooms.

• Kicking and banning occupants.

The MUC service allows any Jabber ID to register a nickname, so nobody else can use that nickname in any room in the MUC service. To register a nickname, open the Service Discovery in your XMPP client and register in the MUC service.

This module supports clustering and load balancing. One module can be started per cluster node. Rooms are distributed at creation time on all available MUC module instances. The multi-user chat module is clustered but the rooms themselves are not clustered nor fault-tolerant: if the node managing a set of rooms goes down, the rooms disappear and they will be recreated on an available node on first connection attempt.

Module options:

host: HostName: This option defines the Jabber ID of the service. If the host option is not specified, the Jabber ID will be the hostname of the virtual host with the prefix ‘conference.’. The keyword “@HOST@” is replaced at start time with the real virtual host name.

db_type: mnesia|sql: Define the type of storage where the module will create the tables and store user information. The default is the storage defined by the global option default_db, or mnesia if omitted. If sql value is defined, make sure you have defined the database, see database.

access: AccessName: You can specify who is allowed to use the Multi-User Chat service. By default everyone is allowed to use it.

access_create: AccessName: To configure who is allowed to create new rooms at the Multi-User Chat service, this option can be used. By default any account in the local ejabberd server is allowed to create rooms.

access_persistent: AccessName: To configure who is allowed to modify the ’persistent’ room option. By default any account in the local ejabberd server is allowed to modify that option.

access_mam: AccessName: To configure who is allowed to modify the ’mam’ room option. By default any account in the local ejabberd server is allowed to modify that option.

access_admin: AccessName: This option specifies who is allowed to administrate the Multi-User Chat service. The default value is none, which means that only the room creator can administer their room. The administrators can send a normal message to the service JID, and it will be shown in all active rooms as a service message. The administrators can send a groupchat message to the JID of an active room, and the message will be shown in the room as a service message.

access_register: AccessName: This option specifies who is allowed to register nickname within the Multi-User Chat service. The default is all for backward compatibility, which means that any user is allowed to register any free nick.

history_size: Size: A small history of the current discussion is sent to users when they enter the room. With this option you can define the number of history messages to keep and send to users joining the room. The value is an integer. Setting the value to 0 disables the history feature and, as a result, nothing is kept in memory. The default value is 20. This value is global and thus affects all rooms on the service.

max_users: Number: This option defines at the service level, the maximum number of users allowed per room. It can be lowered in each room configuration but cannot be increased in individual room configuration. The default value is 200.

max_users_admin_threshold: Number: This option defines the number of service admins or room owners allowed to enter the room when the maximum number of allowed occupants was reached. The default limit is 5.

max_user_conferences: Number: This option defines the maximum number of rooms that any given user can join. The default value is 100. This option is used to prevent possible abuses. Note that this is a soft limit: some users can sometimes join more conferences in cluster configurations.

max_room_id: Number: This option defines the maximum number of characters that Room ID can have when creating a new room. The default value is to not limit: infinity.

regexp_room_id: String: This option defines the regular expression that a Room ID must satisfy to allow the room creation. The default value is the empty string.

max_room_name: Number: This option defines the maximum number of characters that Room Name can have when configuring the room. The default value is to not limit: infinity.

max_room_desc: Number: This option defines the maximum number of characters that Room Description can have when configuring the room. The default value is to not limit: infinity.

max_rooms_discoitems: Number: When there are more rooms than this Number, only the non-empty ones are returned in a Service Discovery query. The default value is: 100.

min_message_interval: Number: This option defines the minimum interval between two messages send by an occupant in seconds. This option is global and valid for all rooms. A decimal value can be used. When this option is not defined, message rate is not limited. This feature can be used to protect a MUC service from occupant abuses and limit number of messages that will be broadcasted by the service. A good value for this minimum message interval is 0.4 second. If an occupant tries to send messages faster, an error is send back explaining that the message has been discarded and describing the reason why the message is not acceptable.

min_presence_interval: Number: This option defines the minimum of time between presence changes coming from a given occupant in seconds. This option is global and valid for all rooms. A decimal value can be used. When this option is not defined, no restriction is applied. This option can be used to protect a MUC service for occupants abuses. If an occupant tries to change its presence more often than the specified interval, the presence is cached by ejabberd and only the last presence is broadcasted to all occupants in the room after expiration of the interval delay. Intermediate presence packets are silently discarded. A good value for this option is 4 seconds.

max_users_presence: Number: This option defines after how many users in the room, it is considered overcrowded. When a MUC room is considered overcrowed, presence broadcasts are limited to reduce load, traffic and excessive presence 'storm' received by participants.

default_room_options: {OptionName: OptionValue}: This module option allows to define the desired default room options. Note that the creator of a room can modify the options of his room at any time using an XMPP client with MUC capability. All of those room options can be set to true or false, except password and title which are strings, and max_users that is integer. The available room options and the default values are:

• allow_change_subj: true|false: Allow occupants to change the subject.

• allow_private_messages: true|false: Occupants can send private messages to other occupants.

• allow_private_messages_from_visitors: anyone|moderators|nobody: Visitors can send private messages to other occupants.

• allow_query_users: true|false: Occupants can send IQ queries to other occupants.

• allow_subscription: true|false: Allow users to subscribe to room events as described in Multi-User Chat Subscriptions.

• allow_user_invites: false|true: Allow occupants to send invitations.

• allow_visitor_nickchange: true|false: Allow visitors to change nickname.

• allow_visitor_status: true|false: Allow visitors to send status text in presence updates. If disallowed, the status text is stripped before broadcasting the presence update to all the room occupants.

• anonymous: true|false: The room is anonymous: occupants don’t see the real JIDs of other occupants. Note that the room moderators can always see the real JIDs of the occupants.

• captcha_protected: false|true: When a user tries to join a room where they have no affiliation (not owner, admin or member), the room requires them to fill a CAPTCHA challenge (see section CAPTCHA) in order to accept their join in the room.

• lang: Language: Preferred language for the discussions in the room. The language format should conform to RFC 5646.

• logging: false|true: The public messages are logged using mod_muc_log.

• mam: false|true: Enable message archiving. Implies mod_mam is enabled.

• max_users: Number: Maximum number of occupants in the room. The default value is 200.

• members_by_default: true|false: The occupants that enter the room are participants by default, so they have ’voice’.

• members_only: false|true: Only members of the room can enter.

• moderated: true|false: Only occupants with ’voice’ can send public messages.

• password: roompass123: Password of the room. You may want to enable the next option too.

• password_protected: false|true: The password is required to enter the room.

• persistent: false|true: The room persists even if the last participant leaves.

• presence_broadcast: [moderator, participant, visitor]: List of roles for which presence is broadcasted. The list can contain one or several of: moderator, participant, visitor.

• public: true|false: The room is public in the list of the MUC service, so it can be discovered. MUC admins and room participants will see private rooms in Service Discovery, and the room name will have the word: "private".

• public_list: true|false: The list of participants is public, without requiring to enter the room.

• title: Room Title: A human-readable title of the room.

Examples:

• In the first example everyone is allowed to use the Multi-User Chat service. Everyone will also be able to create new rooms but only the user admin@example.org is allowed to administrate any room. In this example they are also a global administrator. When admin@example.org sends a message such as ‘Tomorrow, the XMPP server will be moved to new hardware. This will involve service breakdowns around 23:00 UMT. We apologise for this inconvenience.’ to conference.example.org, it will be displayed in all active rooms. In this example the history feature is disabled.

acl: admin: user: - admin@example.org

access_rules: muc_admin: - allow: admin

modules: ... mod_muc: access: all access_create: all access_admin: muc_admin history_size: 0 ...

• In the second example the Multi-User Chat service is only accessible by paying customers registered on our domains and on other servers. Of course the administrator is also allowed to access rooms. In addition, he is the only authority able to create and administer rooms. When admin@example.org sends a message such as ‘Tomorrow, the Jabber server will be moved to new hardware. This will involve service breakdowns around 23:00 UMT. We apologise for this inconvenience.’ to conference.example.org, it will be displayed in all active rooms. No history_size option is used, this means that the feature is enabled and the default value of 20 history messages will be send to the users.

acl: paying_customers: user: - customer1@example.net - customer2@example.com - customer3@example.org admin: user: - admin@example.org

access_rules: muc_admin - allow: admin muc_access: - allow: paying_customers - allow: admin

modules: ... mod_muc: access: muc_access access_create: muc_admin access_admin: muc_admin ...

• In the following example, MUC anti abuse options are used. An occupant cannot send more than one message every 0.4 seconds and cannot change its presence more than once every 4 seconds. The Room IDs can contain only letters and numbers. The length of Room IDs and Room Names are limited to 20 characters, and Room Description to 300 characters. No ACLs are defined, but some user restriction could be added as well:

modules: ... mod_muc: min_message_interval: 0.4 min_presence_interval: 4 regexp_room_id: "^[a-z0-9]+$" max_room_id: 20 max_room_name: 20 max_room_desc: 300 ...

• This example shows how to use default_room_options to make sure the newly created rooms have by default those options.

modules: ... mod_muc: access: muc_access access_create: muc_admin default_room_options: allow_change_subj: false allow_query_users: true allow_private_messages: true members_by_default: false presence_broadcast: [visitor, moderator] title: "New chatroom" anonymous: false access_admin: muc_admin ...

mod_muc_log

This module enables optional logging of Multi-User Chat (MUC) public conversations to HTML. Once you enable this module, users can join a room using a MUC capable XMPP client, and if they have enough privileges, they can request the configuration form in which they can set the option to enable room logging.

Features:

• Room details are added on top of each page: room title, JID, author, subject and configuration.

• The room JID in the generated HTML is a link to join the room (using XMPP URI).

• Subject and room configuration changes are tracked and displayed.

• Joins, leaves, nick changes, kicks, bans and ‘/me’ are tracked and displayed, including the reason if available.

• Generated HTML files are XHTML 1.0 Transitional and CSS compliant.

• Timestamps are self-referencing links.

• Links on top for quicker navigation: Previous day, Next day, Up.

• CSS is used for style definition, and a custom CSS file can be used.

• URLs on messages and subjects are converted to hyperlinks.

• Timezone used on timestamps is shown on the log files.

• A custom link can be added on top of each page.

Options:

access_log: AccessName: This option restricts which occupants are allowed to enable or disable room logging. The default value is muc_admin. Note for this default setting you need to have an access rule for muc_admin in order to take effect.

cssfile: false|URL: With this option you can set whether the HTML files should have a custom CSS file or if they need to use the embedded CSS file. Allowed values are false and an URL to a CSS file. With the first value, HTML files will include the embedded CSS code. With the latter, you can specify the URL of the custom CSS file (for example: http://example.com/my.css). The default value is false.

dirname: room_jid|room_name: Allows to configure the name of the room directory. Allowed values are room_jid and room_name. With the first value, the room directory name will be the full room JID. With the latter, the room directory name will be only the room name, not including the MUC service name. The default value is room_jid.

dirtype: subdirs|plain: The type of the created directories can be specified with this option. Allowed values are subdirs and plain. With the first value, subdirectories are created for each year and month. With the latter, the names of the log files contain the full date, and there are no subdirectories. The default value is subdirs.

file_format: html|plaintext: Define the format of the log files: html stores in HTML format, plaintext stores in plain text. The default value is html.

file_permissions: {mode: Mode, group: Group}: Define the permissions that must be used when creating the log files: the number of the mode, and the numeric id of the group that will own the files. The default value is {644, 33}.

outdir: Path: This option sets the full path to the directory in which the HTML files should be stored. Make sure the ejabberd daemon user has write access on that directory. The default value is www/muc.

spam_prevention: true|false: To prevent spam, the spam_prevention option adds a special attribute to links that prevent their indexation by search engines. The default value is true, which mean that nofollow attributes will be added to user submitted links.

timezone: local|universal: The time zone for the logs is configurable with this option. Allowed values are local and universal. With the first value, the local time, as reported to Erlang by the operating system, will be used. With the latter, GMT/UTC time will be used. The default value is local.

top_link: {URL: Text}: With this option you can customize the link on the top right corner of each log file. The default value is {/, Home}.

url: URL: A top level URL where a client is able to access logs of a particular conference. The conference name is appended to the URL if dirname is room_name or a conference JID is appended to the URL if dirname is room_jid.

Examples:

• In the first example any room owner can enable logging, and a custom CSS file will be used, http://example.com/my.css. The names of the log files will contain the full date, and there will be no subdirectories. The log files will be stored in /var/www/muclogs, and the time zone will be GMT/UTC. Finally, the top link will be <a href="http://www.jabber.ru/">Jabber.ru</a>.

access_rules: - muc: allow

modules: ... mod_muc_log: access_log: muc cssfile: http://example.com/my.css dirtype: plain dirname: room_jid outdir: /var/www/muclogs timezone: universal spam_prevention: true top_link: http://www.jabber.ru/: Jabber.ru ...

• In the second example only admin1@example.org and admin2@example.net can enable logging, and the embedded CSS file will be used. The names of the log files will only contain the day (number), and there will be subdirectories for each year and month. The log files will be stored in /var/www/muclogs, and the local time will be used. Finally, the top link will be the default <a href="/">Home</a>.

acl: admin: user: - admin1@example.org - admin2@example.net access_rules: muc_log: - allow: admin

modules: ... mod_muc_log: access_log: muc_log cssfile: false dirtype: subdirs file_permissions: mode: 644 group: 33 outdir: /var/www/muclogs timezone: local ...

• In the third example log files are served by mod_http_fileserver module and are available at https://domain.tld:5443/chatlogs:

    listen:
      ...
      -
        module: ejabberd_http
        port: 5443
        tls: true
        request_hanlers:
          /chatlogs: mod_http_fileserver
          ...
  
    modules:
      ...
      mod_http_fileserver:
        docroot: /var/www/muclogs
        ...
      mod_muc_log:
        url: https://domain.tld:5443/chatlogs
        outdir: /var/www/muclogs
        ...
  

mod_multicast

This module implements a service for Extended Stanza Addressing (XEP-0033)

Enabling multicast

Edit ejabberd.yml and add the module to the list of modules:

mod_multicast: []

Configurable options

• host: Define the hostname of the service. Default value: "multicast.SERVER"

• access: Specify who can send packets to the multicast service. Default value: all

• limits: Specify a list of custom limits which override the default ones defined in XEP-0033. Limits are defined per sender type and stanza type, where:

• The sender type can be: local or remote.
• The stanza type can be: message or presence.
• The number can be a positive integer or the key word infinite.
• Default values:

local: message: 100 presence: 100 remote: message: 20 presence: 20

Example configuration

# Only admins can send packets to multicast service access_rules: multicast: - allow: admin

# If you want to allow all your users: access_rules: multicast: - allow

# This allows both admins and remote users to send packets, # but does not allow local users acl: allservers: server_glob: "*" access_rules: multicast: - allow: admin - deny: local - allow: allservers

modules: mod_multicast: host: multicast.example.org access: multicast limits: local: message: 40 presence: infinite remote: message: 150

Service check

You have to restart ejabberd after adding or modifying mod_multicast configuration.

To verify the service is running, login to ejabberd with a XMPP client, open the service discovery and check that there's a service called "Multicast".

How to simulate group chat with multicast

For stanza sender

Instead of sending two stanzas, like this:

<message to='user2@localhost' type='chat'>
   <body>Hello, world!</body>
</message>
<message to='user3@localhost' type='chat'>
   <body>Hello, world!</body>
</message>

now you can send a stanza like this:

<message to='multicast.localhost' type='chat'>
   <addresses xmlns='http://jabber.org/protocol/address'>
       <address type='to' jid='user2@localhost'/>
       <address type='cc' jid='user3@localhost'/>
   </addresses>
   <body>Hello, world!</body>
</message>

For the stanza receivers

They will receive something like this:

<message from='user1@localhost/tka1'
        to='user3@localhost'
        type='chat'>
  <addresses xmlns='http://jabber.org/protocol/address'>
    <address type='cc'
        jid='user3@localhost'/>
  </addresses>
  <body>Hello, world!</body>
</message>

The addresses tag let the receiver knows that there were multiple recipients and can:

• Display it properly in client interface.
• Reply to all recipients.

mod_offline

Description

This module implements offline message storage (XEP-0160) and flexible offline message retrieval (XEP-0013). This means that all messages sent to an offline user will be stored on the server until that user comes online again. Thus it is very similar to how email works. A user is considered offline if no session presence priority > 0 are currently open.

Note that ejabberdctl has a command to delete expired messages (see section Managing: ejabberdctl).

Options

db_type: mnesia|sql: Define the type of storage where the module will create the tables and store user information. The default is the storage defined by the global option default_db, or mnesia if omitted. If sql value is defined, make sure you have defined the database, see database.

access_max_user_messages: AccessName: This option defines which access rule (atom) will be enforced to limit the maximum number of offline messages that a user can have (quota). When a user has too many offline messages, any new messages that they receive are discarded, and a resource-constraint error is returned to the sender. The default value is max_user_offline_messages. Then you can define an access rule with a syntax similar to max_user_sessions (see Limiting Opened Sessions with ACL).

store_empty_body: true|false|unless_chat_state: Whether or not to store messages that lack a <body/> element. The default value is unless_chat_state, which tells ejabberd to store messages even if they lack the <body/> element, unless they only contain a chat state notification (as defined in XEP-0085).

pool_size: Size: This option specifies the size of the worker pool for storing offline messages. The allowed values are positive integers. Default value: 16.

bounce_groupchat: false|true: This option is use the disable an optimisation that avoids bouncing error messages when groupchat messages could not be stored as offline. It will reduce chat room load, without any drawback in standard use cases. You may change default value only if you have a custom module which uses offline hook after mod_offline. This option can be useful for both standard MUC and MucSub, but the bounce is much more likely to happen in the context of MucSub, so it is even more important to have it on large MucSub services.The default is false, meaning the optimisation is enabled.

use_mam_for_storage: false|true: This is an experimental option. Enabling this option will make mod_offline not use the former spool table for storing MucSub offline messages, but will use the archive table instead. This use of the archive table is cleaner and it makes it possible for clients to slowly drop the former offline use case and rely on message archive instead. It also further reduce the storage required when you enabled MucSub. Enabling this option has a known drawback for the moment: most of flexible message retrieval queries don’t work (those that allow retrieval/deletion of messages by id), but this specification is not widely used. The default value is false to keep former behaviour as default and ensure this option is disabled.

Example Configuration

This example allows power users to have as much as 5000 offline messages, administrators up to 2000, and all the other users up to 100.

acl: admin: user: - admin1@localhost - admin2@example.org poweruser: user: - bob@example.org - jane@example.org

shaper_rules: max_user_offline_messages: - 5000: poweruser - 2000: admin - 100

modules: ... mod_offline: access_max_user_messages: max_user_offline_messages ...

Implementation notes

You have several approach for a client to learn what happened when it was offline:

• offline storage: This is adequate especially when a single client is typically used at a time.
• message archive (MAM): This is a new archiving feature. A client (for example a mobile client) can use it to resync its own history with what happened when it was offline. In that case, the client is responsible for marking messages it considers new as "unread". See mod_mam.

Some clients may rely on offline and/or message archives to catch up on messages on reconnect, but client developers should always consider interactions with those two modules together.

mod_ping

This module implements support for XMPP Ping (XEP-0199) and periodic keepalives. When this module is enabled ejabberd responds correctly to ping requests, as defined in the protocol.

Configuration options:

send_pings: true|false: If this option is set to true, the server sends pings to connected clients that are not active in a given interval ping_interval. This is useful to keep client connections alive or checking availability. By default this option is disabled.

ping_interval: Seconds: How often to send pings to connected clients, if the previous option is enabled. If a client connection does not send or receive any stanza in this interval, a ping request is sent to the client. The default value is 60 seconds.

ping_ack_timeout: Seconds: How long to wait before deeming that a client has not answered a given server ping request. default value is 32 seconds.

timeout_action: none|kill: What to do when a client does not answer to a server ping request in less than ping_ack_timeout. The default is to do nothing.

This example enables Ping responses, configures the module to send pings to client connections that are inactive for 4 minutes, and if a client does not answer to the ping in less than 32 seconds, its connection is closed:

modules: ... mod_ping: send_pings: true ping_interval: 240 timeout_action: kill ...

mod_pres_counter

This module detects flood/spam in presence subscription stanza traffic. If a user sends or receives more of those stanzas in a time interval, the exceeding stanzas are silently dropped, and warning is logged.

Configuration options:

count: StanzaNumber: The number of subscription presence stanzas (subscribe, unsubscribe, subscribed, unsubscribed) allowed for any direction (input or output) per time interval. Please note that two users subscribing to each other usually generate 4 stanzas, so the recommended value is 4 or more. The default value is: 5.

interval: Seconds: The time interval defined in seconds. The default value is 60.

This example enables the module, and allows up to 5 presence subscription stanzas to be sent or received by the users in 60 seconds:

modules: ... mod_pres_counter: count: 5 interval: 60 ...

mod_privacy

This module implements XEP-0016: Privacy Lists`. If end users have support for it in their XMPP client, they will be able to:

• Retrieving one’s privacy lists.
• Adding, removing, and editing one’s privacy lists.
• Setting, changing, or declining active lists.
• Setting, changing, or declining the default list (i.e., the list that is active by default).
• Allowing or blocking messages based on JID, group, or subscription type (or globally).
• Allowing or blocking inbound presence notifications based on JID, group, or subscription type (or globally).
• Allowing or blocking outbound presence notifications based on JID, group, or subscription type (or globally).
• Allowing or blocking IQ stanzas based on JID, group, or subscription type (or globally).
• Allowing or blocking all communications based on JID, group, or subscription type (or globally).

Options:

db_type: mnesia|sql: Define the type of storage where the module will create the tables and store user information. The default is the storage defined by the global option default_db, or mnesia if omitted. If sql value is defined, make sure you have defined the database, see database.

use_cache: false|true: Use this option and related ones as explained in section Caching.

mod_private

This module adds support for Private XML Storage (XEP-0049):

Using this method, XMPP entities can store private data on the server and retrieve it whenever necessary. The data stored might be anything, as long as it is valid XML. One typical usage for this namespace is the server-side storage of client-specific preferences; another is Bookmark Storage (XEP-0048).

Options:

db_type: mnesia|sql: Define the type of storage where the module will create the tables and store user information. The default is the storage defined by the global option default_db, or mnesia if omitted. If sql value is defined, make sure you have defined the database, see database.

use_cache: false|true: Use this option and related ones as explained in section Caching.

mod_privilege

This module is an implementation of (XEP-0356). This extension allows components to have privileged access to other entity data (send messages on behalf of the server or on behalf of a user, get/set user roster, access presence information, etc.). This may be used to write powerful external components, for example implementing an external PEP (XEP-0163: Personal Eventing Protocol) or MAM (XEP-0313: Message Archive Management) service.

Permission list

By default a component does not have any privileged access. It is worth noting that the permissions listed below grant access to the component to a specific data type for all users of the domain.

When configuring mod_privilege module, here are the available permissions:

• presence
• managed_entity: receive server user presence.
• roster: the component is allowed to receive the presence of both the users and the contacts in their roster.
• message
• outgoing: the component is allowed to send messages on behalf of either the server or a bare JID of server users.
• roster
• get: read access to a user's roster.
• set: write access to a user's roster.
• both: read/write access to a user's roster.

You grant access to the component by providing an ACL to apply to that permission or all to give that access level to all authenticated components.

Example

If you want to grant privileged access to a component, specify it in the module configurations, e.g.:

module:
...
  mod_privilege:
    roster:
      get: all
    presence:
      managed_entity: all
    message:
      outgoing: all

In the example above, the sat-pubsub.example.org component can get the roster of every user of the server and send messages on behalf of the server.

Note: You need to make sure you have a listener configured to connect your component. Check the listener section for more information.

Here is a more complete example, with ACL and support for namespace delegation (XEP-0355):

listen:
...
  - port: 8888
    module: ejabberd_service
    hosts:
      sat-pubsub.example.org:
        password: mypass

acl:
...
  external_component:
    server:
      - sat-pubsub.example.org

access_rules:
...
  external_pubsub:
    - allow: external_component

module:
...
  mod_delegation:
    namespaces:
      "http://jabber.org/protocol/pubsub":
         access: external_pubsub
  mod_privilege:
    roster:
      get: external_pubsub
    presence:
      managed_entity: external_pubsub
    message:
      outgoing: external_pubsub

Security issue

Privileged access gives components access to sensitive data, so permission should be granted carefully, only if you trust a component.

Note

This module is complementary to mod_delegation (XEP-0355) but can also be used separately.

mod_proxy65

This module implements SOCKS5 Bytestreams (XEP-0065). It allows ejabberd to act as a file transfer proxy between two XMPP clients.

Options:

host: HostName: This option defines the Jabber ID of the service. If the host option is not specified, the Jabber ID will be the hostname of the virtual host with the prefix ‘proxy.’. The keyword “@HOST@” is replaced at start time with the real virtual host name.

name: Text: Defines Service Discovery name of the service. Default is SOCKS5 Bytestreams.

ip: IP: This option specifies which network interface to listen for. Default is an IP address of the service’s DNS name, or, if fails, "127.0.0.1".

port: Number: This option defines port to listen for incoming connections. Default is 7777.

hostname: HostName: Defines a hostname advertised by the service when establishing a session with clients. This is useful when you run the service behind a NAT. The keyword “@HOST@” is replaced with the virtual host name. The default is the value of ip option. Examples: proxy.mydomain.org, 200.150.100.50. Note that not all clients understand domain names in stream negotiation, so you should think twice before setting domain name in this option.

auth_type: anonymous|plain: SOCKS5 authentication type. Possible values are anonymous and plain. Default is anonymous.

access: AccessName: Defines ACL for file transfer initiators. Default is all.

max_connections: Number: Maximum number of active connections per file transfer initiator. No limit by default.

shaper: none|ShaperName: This option defines shaper for the file transfer peers. Shaper with the maximum bandwidth will be selected. Default is none.

Examples:

• The simplest configuration of the module:

modules: ... mod_proxy65: {} ...

• More complicated configuration.

acl: admin: user: - admin@example.org proxy_users: server: - example.org

access_rules: proxy65_access: - allow: proxy_users shaper_rules: proxy65_shaper: - none: admin - proxyrate: proxy_users

shaper: proxyrate: 10240

modules: ... mod_proxy65: host: proxy1.example.org name: "File Transfer Proxy" ip: 200.150.100.1 port: 7778 max_connections: 5 access: proxy65_access shaper: proxy65_shaper ...

mod_pubsub

This module offers a Publish-Subscribe Service (XEP-0060). The functionality in mod_pubsub can be extended using plugins. The plugin that implements PEP (Personal Eventing via Pubsub) (XEP-0163) is enabled in the default ejabberd configuration file, and it requires mod_caps.

Options:

host: HostName: This option defines the Jabber ID of the service. If the host option is not specified, the Jabber ID will be the hostname of the virtual host with the prefix ‘pubsub.’. The keyword “@HOST@” is replaced at start time with the real virtual host name.

If you use mod_pubsub with sql db_type, please ensure the prefix contains only one dot, for example ‘pubsub.’, or ‘publish.’,.

access_createnode: AccessName: This option restricts which users are allowed to create pubsub nodes using ACL and ACCESS. By default any account in the local ejabberd server is allowed to create pubsub nodes.

max_items_node: MaxItems: Define the maximum number of items that can be stored in a node. Default value is 10.

max_subscriptions_node: MaxSubs: Define the maximum number of subscriptions managed by a node. Default value is undefined; no limitation.

plugins: [ Plugin, ...]: To specify which pubsub node plugins to use. The first one in the list is used by default. If this option is not defined, the default plugins list is: [flat]. PubSub clients can define which plugin to use when creating a node: add type=’plugin-name’ attribute to the create stanza element.

• flat plugin handles the default behaviour and follows standard XEP-0060 implementation.

• pep plugin adds extension to handle Personal Eventing Protocol (XEP-0163) to the PubSub engine. Adding pep plugin to PubSub make it handle PEP automatically.

nodetree: Nodetree: To specify which nodetree to use. If not defined, the default pubsub nodetree is used: tree. Only one nodetree can be used per host, and is shared by all node plugins.

• tree nodetree store node configuration and relations on the database. flat nodes are stored without any relationship, and hometree nodes can have child nodes.

• virtual nodetree does not store nodes on database. This saves resources on systems with tons of nodes. If using the virtual nodetree, you can only enable those node plugins: [flat, pep] or [flat]; any other plugins configuration will not work. Also, all nodes will have the default configuration, and this can not be changed. Using “virtual” nodetree requires to start from a clean database, it will not work if you used the default “tree” nodetree before.

• dag nodetree provides experimental support for PubSub Collection Nodes (XEP-0248). In that case you should also add “dag” node plugin as default, for example:

  plugins: [flat,pep]
  

ignore_pep_from_offline: false|true: To specify whether or not we should get last published PEP items from users in our roster which are offline when we connect. Value is true or false. If not defined, pubsub assumes true so we only get last items of online contacts.

last_item_cache: false|true: To specify whether or not pubsub should cache last items. Value is true or false. If not defined, pubsub do not cache last items. On systems with not so many nodes, caching last items speeds up pubsub and allows to raise user connection rate. The cost is memory usage, as every item is stored in memory.

default_node_config: Config: To override default node configuration, regardless of node plugin. Value is a list of key-value definition. Node configuration still uses default configuration defined by node plugin, and overrides any items by value defined in this configurable list.

pep_mapping: {Key, Value}: This allow to define a Key-Value list to choose defined node plugins on given PEP namespace. The following example will use node_tune instead of node_pep for every PEP node with tune namespace:

 modules:
   ...
   mod_pubsub:
     pep_mapping:
       http://jabber.org/protocol/tune: tune
   ...

Example of configuration that uses flat nodes as default, and allows use of flat, hometree and pep nodes:

modules: ... mod_pubsub: access_createnode: pubsub_createnode max_subscriptions_node: 100 default_node_config: notification_type: normal notify_retract: false max_items: 4 plugins: - flat - pep ...

Using relational database requires using mod_pubsub with db_type sql. Only flat, hometree and pep plugins supports SQL. The following example shows previous configuration with SQL usage:

modules: ... mod_pubsub: db_type: sql access_createnode: pubsub_createnode ignore_pep_from_offline: true last_item_cache: false plugins: - flat - pep ...

mod_push

This module implements the XMPP server's part of the push notification solution specified in XEP-0357. It does not generate, for example, APNS or FCM notifications directly. Instead, it's designed to work with so-called "app servers" operated by third-party vendors of mobile apps. Those app servers will usually trigger notification delivery to the user's mobile device using platform-dependant backend services such as FCM or APNS.

Options:

include_sender: true|false: If this option is set to true, the sender's JID is included with push notifications generated for incoming messages with a body. Default: false.

include_body: true|false|String: If this option is set to true, the message text is included with push notifications generated for incoming messages with a body. The option can instead be set to a static text, in which case the specified text will be included in place of the actual message body. This can be useful to signal the app server whether the notification was triggered by a message with body (as opposed to other types of traffic) without leaking actual message contents. Default: "New message".

db_type: mnesia|sql: The type of storage where the module will store push session information. The default is the storage defined by the global option default_db, or mnesia if omitted. If sql is specified, make sure you have configured the database, see the database section.

use_cache: false|true: Use this option and related ones as explained in the section on caching.

mod_push_keepalive

This module tries to keep the stream management session of a disconnected mobile client alive if the client enabled push notifications for that session. However, the normal session resumption timeout is restored once a push notification is issued, so the session will be closed if the client doesn't respond to push notifications.

Options:

resume_timeout: Seconds|undefined: This option specifies the number of seconds until the session of a disconnected push client times out. This timeout is only in effect as long as no push notification is issued. Once that happened, the resumption timeout configured for the stream management module is restored. If this option is set to undefined, the resumption timeout won't be modified by mod_push_keepalive. Default: 259200.

wake_on_start: true|false: If this option is set to true, notifications are generated for all registered push clients during server startup. This option should not be enabled on servers with many push clients as it can generate significant load on the involved push services. Default: false.

wake_on_timeout: true|false: If this option is set to true, a notification is generated shortly before the session would time out as per the resume_timeout described above. Default: true.

mod_register

This module adds support for In-Band Registration (XEP-0077). This protocol enables end users to use a XMPP client to:

• Register a new account on the server.

• Change the password from an existing account on the server.

• Delete an existing account on the server.

Options:

access: AccessName: Specify rules to restrict what usernames can be registered and unregistered. If a rule returns ‘deny’ on the requested username, registration and unregistration of that user name is denied. There are no restrictions by default.

access_from: AccessName: By default, ejabberd doesn't allow to register new accounts from s2s or existing c2s sessions. You can change it by defining access rule in this option. Use with care: allowing registration from s2s leads to uncontrolled massive accounts creation by rogue users.

captcha_protected: false|true: Protect registrations with CAPTCHA (see section CAPTCHA). The default is false.

ip_access: AccessName: Define rules to allow or deny account registration depending on the IP address of the XMPP client. The AccessName should be of type ip. The default value is all.

password_strength: Entropy: This option sets the minimum Shannon entropy for passwords. The value Entropy is a number of bits of entropy. The recommended minimum is 32 bits. The default is 0, i.e. no checks are performed.

redirect_url: URL: This option enables registration redirection as described in XEP-0077: In-Band Registration: Redirection.

registration_watchers: [ JID, ...]: This option defines a list of JIDs which will be notified each time a new account is registered.

welcome_message: {subject: Subject, body: Body}: Set a welcome message that is sent to each newly registered account. The first string is the subject, and the second string is the message body.

This module reads also another option defined globally for the server: registration_timeout: Timeout. This option limits the frequency of registration from a given IP or username. So, a user that tries to register a new account from the same IP address or JID during this number of seconds after their previous registration will receive an error resource-constraint with the explanation: “Users are not allowed to register accounts so quickly”. The timeout is expressed in seconds, and it must be an integer. To disable this limitation, instead of an integer put a word like: infinity. Default value: 600 seconds.

Examples:

• Next example prohibits the registration of too short account names, and allows to create accounts only to clients of the local network:

acl: loopback: ip: - 127.0.0.0/8 - "::1" shortname: user_glob: - "?" - "??" ## The same using regexp: ##user_regexp: "^..?$"

access_rules: mynetworks: - allow: loopback register: - deny: shortname - allow: all

modules: mod_register: ip_access: mynetworks access: register

• This configuration prohibits usage of In-Band Registration to create or delete accounts, but allows existing accounts to change the password:

modules: ... mod_register: access: none ...

• This configuration disables all In-Band Registration functionality: create, delete accounts and change password:

modules: ... ## mod_register: ## access: register ...

• Define the welcome message and two registration watchers. Also define a registration timeout of one hour:

registration_timeout: 3600 modules: ... mod_register: welcome_message: subject: "Welcome!" body: |- Hi. Welcome to this XMPP server. Check https://xmpp.org/

      Bye
  registration_watchers:
    - admin1@example.org
    - boss@example.net
  redirect_url: http://my.site.org/register
...

mod_register_web

This module provides a web page where people can:

• Register a new account on the server.

• Change the password from an existing account on the server.

• Delete an existing account on the server.

This module supports CAPTCHA image to register a new account. To enable this feature, configure the options captcha_cmd and captcha_host.

Options:

registration_watchers: [ JID, ...]: This option defines a list of JIDs which will be notified each time a new account is registered.

This example configuration shows how to enable the module and the web handler:

hosts: - localhost - example.org - example.com

certfiles: - /etc/ejabberd/certificate.pem

listen: ... - port: 5281 module: ejabberd_http tls: true request_handlers: /register: mod_register_web ...

modules: ... mod_register_web: {} ...

For example, the users of the host example.org can visit the page: https://example.org:5281/register/ It is important to include the last / character in the URL, otherwise the subpages URL will be incorrect.

mod_roster

This module implements roster management as defined in RFC 6121: XMPP IM. It also supports Roster Versioning (XEP-0237).

Options:

db_type: mnesia|sql: Define the type of storage where the module will create the tables and store user information. The default is the storage defined by the global option default_db, or mnesia if omitted. If sql value is defined, make sure you have defined the database, see database.

use_cache: false|true: Use this option and related ones as explained in section Caching.

versioning: false|true: Enables Roster Versioning. This option is disabled by default. We use a simplified version of roster versioning.

store_current_id: false|true: If this option is enabled, the current version number is stored on the database. If disabled, the version number is calculated on the fly each time. Enabling this option reduces the load for both ejabberd and the database. This option does not affect the client in any way. This option is only useful if Roster Versioning is enabled. This option is disabled by default. Important: if you use mod_shared_roster or mod_shared_roster_ldap, you must disable this option.

access: This option can be configured to specify rules to restrict roster management. If a rule returns ‘deny’ on the requested user name, that user cannot modify their personal roster: not add/remove/modify contacts, or subscribe/unsubscribe presence. By default there aren’t restrictions.

This example configuration enables Roster Versioning with storage of current id. The ICQ and MSN transports can get ICQ and MSN contacts, add them, or remove them for any local account:

modules: ... mod_roster: versioning: true store_current_id: true ...

With this example configuration, only admins can manage their rosters; everybody else cannot modify the roster:

acl: admin: user: - sarah@example.org access_rules: roster: - allow: admin

modules: ... mod_roster: access: roster ...

mod_s2s_dialback

This module adds support for the Server Dialback protocol (XEP-0220) to provide identity verification based on DNS.

mod_service_log

This module adds support for logging end user packets via a XMPP message auditing service such as Bandersnatch. All user packets are encapsulated in a <route/> element and sent to the specified service(s).

Options:

loggers: [Names, ...]: With this option a (list of) service(s) that will receive the packets can be specified.

Examples:

• To log all end user packets to the Bandersnatch service running on bandersnatch.example.com:

modules: ... mod_service_log: loggers: [bandersnatch.example.com] ...

• To log all end user packets to the Bandersnatch service running on bandersnatch.example.com and the backup service on bandersnatch.example.org:

modules: ... mod_service_log: loggers: - bandersnatch.example.com - bandersnatch.example.org ...

mod_shared_roster

This module enables you to create shared roster groups. This means that you can create groups of people that can see members from (other) groups in their rosters. The big advantages of this feature are that end users do not need to manually add all users to their rosters, and that they cannot permanently delete users from the shared roster groups. A shared roster group can have members from any XMPP server, but the presence will only be available from and to members of the same virtual host where the group is created.

It still allows the users to have / add their own contacts, as it does not replace the standard roster. Instead, the shared roster contacts are merged to the relevant users at retrieval time. The standard user rosters thus stay unmodified.

Special values like @all@ and @online@ will help populating the shared roster dynamically. It means that the actual list of members in those shared rosters is generated dynamically at retrieval time.

Note: mod_shared_roster depends on mod_roster being enabled. Roster queries will return 503 errors if mod_roster is not enabled.

Options:

db_type: mnesia|sql: Define the type of storage where the module will create the tables and store user information. The default is the storage defined by the global option default_db, or mnesia if omitted. If sql value is defined, make sure you have defined the database, see database.

Shared roster groups can be edited only via the Web Admin. Each group has a unique identification and the following parameters:

• Name: The name of the group, which will be displayed in the roster.

• Description: The description of the group. This parameter does not affect anything.

• Members: A list of JIDs of group members, entered one per line in the Web Admin. The special member directive @all@ represents all the registered users in the virtual host; which is only recommended for a small server with just a few hundred users. The special member directive @online@ represents the online users in the virtual host.

• Displayed groups: A list of groups that will be in the rosters of this group’s members. A group of other vhost can be identified with groupid@vhost

Examples:

• Take the case of a computer club that wants all its members seeing each other in their rosters. To achieve this, they need to create a shared roster group similar to this one:

Identification: Group ‘club_members’

Name: Club Members

Description: Members from the computer club

Members: member1@example.org, member2@example.org, member3@example.org

Displayed groups: club_members

• In another case we have a company which has three divisions: Management, Marketing and Sales. All group members should see all other members in their rosters. Additionally, all managers should have all marketing and sales people in their roster. Simultaneously, all marketeers and the whole sales team should see all managers. This scenario can be achieved by creating shared roster groups as shown in the following lists:

First list:

Identification: Group ‘management’

Name: Management

Description: Management

Members: manager1@example.org, manager2@example.org

Displayed groups: management, marketing, sales

Second list:

Identification: Group ‘marketing’

Name: Marketing

Description: Marketing

Members: marketeer1@example.org, marketeer2@example.org, marketeer3@example.org

Displayed groups: management, marketing

Third list:

Identification: Group ‘sales’

Name: Sales

Description: Sales

Members: salesman1@example.org, salesman2@example.org, salesman3@example.org

Displayed groups: management, sales

mod_shared_roster_ldap

This module lets the server administrator automatically populate users’ rosters (contact lists) with entries based on users and groups defined in an LDAP-based directory.

Note: mod_shared_roster_ldap depends on mod_roster being enabled. Roster queries will return 503 errors if mod_roster is not enabled.

Configuration parameters

The module accepts the following configuration parameters. Some of them, if unspecified, default to the values specified for the top level of configuration. This lets you avoid specifying, for example, the bind password, in multiple places.

use_cache: false|true: Use this option and related ones as explained in section Caching.

Filters

These parameters specify LDAP filters used to query for shared roster information. All of them are run against the ldap_base.

ldap_rfilter: So called “Roster Filter”. Used to find names of all “shared roster” groups. See also the ldap_groupattr parameter. If unspecified, defaults to the top-level parameter of the same name. You must specify it in some place in the configuration, there is no default.

ldap_ufilter: “User Filter” – used for retrieving the human-readable name of roster entries (usually full names of people in the roster). See also the parameters ldap_userdesc and ldap_useruid. If unspecified, defaults to the top-level parameter of the same name. If that one also is unspecified, then the filter is assembled from values of other parameters as follows ([ldap_SOMETHING] is used to mean “the value of the configuration parameter ldap_SOMETHING”):

(&(&([ldap_memberattr]=[ldap_memberattr_format])([ldap_groupattr]=%g))[ldap_filter])

Subsequently %u and %g are replaced with a *. This means that given the defaults, the filter sent to the LDAP server would be (&(memberUid=*)(cn=*)). If however the ldap_memberattr_format is something like uid=%u,ou=People,o=org, then the filter will be (&(memberUid=uid=*,ou=People,o=org)(cn=*)).

ldap_gfilter: “Group Filter” – used when retrieving human-readable name (a.k.a. “Display Name”) and the members of a group. See also the parameters ldap_groupattr, ldap_groupdesc and ldap_memberattr. If unspecified, defaults to the top-level parameter of the same name. If that one also is unspecified, then the filter is constructed exactly in the same way as User Filter.

ldap_filter: Additional filter which is AND-ed together with User Filter and Group Filter. If unspecified, defaults to the top-level parameter of the same name. If that one is also unspecified, then no additional filter is merged with the other filters.

Note that you will probably need to manually define the User and Group Filter (since the auto-assembled ones will not work) if:

• your ldap_memberattr_format is anything other than a simple %u,

• and the attribute specified with ldap_memberattr does not support substring matches.

An example where it is the case is OpenLDAP and (unique)MemberName attribute from the groupOf(Unique)Names objectClass. A symptom of this problem is that you will see messages such as the following in your slapd.log:

get_filter: unknown filter type=130 filter="(&(?=undefined)(?=undefined)(something=else))"

Attributes

These parameters specify the names of the attributes which hold interesting data in the entries returned by running filters specified in section Filters.

ldap_groupattr: The name of the attribute that holds the group name, and that is used to differentiate between them. Retrieved from results of the “Roster Filter” and “Group Filter”. Defaults to cn.

ldap_groupdesc: The name of the attribute which holds the human-readable group name in the objects you use to represent groups. Retrieved from results of the “Group Filter”. Defaults to whatever ldap_groupattr is set.

ldap_memberattr: The name of the attribute which holds the IDs of the members of a group. Retrieved from results of the “Group Filter”. Defaults to memberUid.

The name of the attribute differs depending on the objectClass you use for your group objects, for example:

posixGroup -> memberUid groupOfNames -> member groupOfUniqueNames -> uniqueMember

ldap_userdesc: The name of the attribute which holds the human-readable user name. Retrieved from results of the “User Filter”. Defaults to cn.

ldap_useruid: The name of the attribute which holds the ID of a roster item. Value of this attribute in the roster item objects needs to match the ID retrieved from the ldap_memberattr attribute of a group object. Retrieved from results of the “User Filter”. Defaults to cn.

Control parameters

These parameters control the behaviour of the module.

ldap_memberattr_format: A globbing format for extracting user ID from the value of the attribute named by ldap_memberattr. Defaults to %u, which means that the whole value is the member ID. If you change it to something different, you may also need to specify the User and Group Filters manually — see section Filters.

ldap_memberattr_format_re: A regex for extracting user ID from the value of the attribute named by ldap_memberattr.

An example value “CN=(\\w*),(OU=.*,)*DC=company,DC=com” works for user IDs such as the following:

• CN=Romeo,OU=Montague,DC=company,DC=com
• CN=Abram,OU=Servants,OU=Montague,DC=company,DC=com
• CN=Juliet,OU=Capulet,DC=company,DC=com
• CN=Peter,OU=Servants,OU=Capulet,DC=company,DC=com

In case:

• the option is unset,
• or the re module in unavailable in the current Erlang environment,
• or the regular expression does not compile,

then instead of a regular expression, a simple format specified by ldap_memberattr_format is used. Also, in the last two cases an error message is logged during the module initialization.

Also, note that in all cases ldap_memberattr_format (and *not* the regex version) is used for constructing the default “User/Group Filter” — see section Filters.

ldap_auth_check: Whether the module should check (via the ejabberd authentication subsystem) for existence of each user in the shared LDAP roster. See section mod_shared_roster_ldap form more information. Set to off if you want to disable the check. Defaults to on.

ldap_user_cache_validity: Number of seconds for which the cache for roster item full names is considered fresh after retrieval. 300 by default. See section mod_shared_roster_ldap on how it is used during roster retrieval.

ldap_group_cache_validity: Number of seconds for which the cache for group membership is considered fresh after retrieval. 300 by default. See section mod_shared_roster_ldap on how it is used during roster retrieval.

Connection parameters

The module also accepts the connection parameters, all of which default to the top-level parameter of the same name, if unspecified. See LDAP Connection] for more information about them.

Retrieving the roster

When the module is called to retrieve the shared roster for a user, the following algorithm is used:

1. [step:rfilter] A list of names of groups to display is created: the Roster Filter is run against the base DN, retrieving the values of the attribute named by ldap_groupattr.

2. Unless the group cache is fresh (see the ldap_group_cache_validity option), it is refreshed:

3. Information for all groups is retrieved using a single query: the Group Filter is run against the Base DN, retrieving the values of attributes named by ldap_groupattr (group ID), ldap_groupdesc (group “Display Name”) and ldap_memberattr (IDs of group members).

4. group “Display Name”, read from the attribute named by ldap_groupdesc, is stored in the cache for the given group

5. the following processing takes place for each retrieved value of attribute named by ldap_memberattr:

6. the user ID part of it is extracted using ldap_memberattr_format(_re),

7. then (unless ldap_auth_check is set to off) for each found user ID, the module checks (using the ejabberd authentication subsystem) whether such user exists in the given virtual host. It is skipped if the check is enabled and fails.

This step is here for historical reasons. If you have a tidy DIT and properly defined “Roster Filter” and “Group Filter”, it is safe to disable it by setting ldap_auth_check to off — it will speed up the roster retrieval.

1. the user ID is stored in the list of members in the cache for the given group

2. For each item (group name) in the list of groups retrieved in step [step:rfilter]:

3. the display name of a shared roster group is retrieved from the group cache

4. for each IDs of users which belong to the group, retrieved from the group cache:

5. the ID is skipped if it’s the same as the one for which we are retrieving the roster. This is so that the user does not have himself in the roster.

6. the display name of a shared roster user is retrieved:

7. first, unless the user name cache is fresh (see the ldap_user_cache_validity option), it is refreshed by running the User Filter, against the Base DN, retrieving the values of attributes named by ldap_useruid and ldap_userdesc.

8. then, the display name for the given user ID is retrieved from the user name cache.

Configuration examples

Since there are many possible DIT layouts, it will probably be easiest to understand how to configure the module by looking at an example for a given DIT (or one resembling it).

Flat DIT

This seems to be the kind of DIT for which this module was initially designed. Basically there are just user objects, and group membership is stored in an attribute individually for each user. For example in a layout shown in figure [fig:msrl-dit-flat], the group of each user is stored in its ou attribute.

Such layout has a few downsides, including:

• information duplication – the group name is repeated in every member object

• difficult group management – information about group members is not centralized, but distributed between member objects

• inefficiency – the list of unique group names has to be computed by iterating over all users

This however seems to be a common DIT layout, so the module keeps supporting it. You can use the following configuration…

modules: ... mod_shared_roster_ldap: ldap_base: "ou=flat,dc=nodomain" ldap_rfilter: "(objectClass=inetOrgPerson)" ldap_groupattr: ou ldap_memberattr: cn ldap_filter: "(objectClass=inetOrgPerson)" ldap_userdesc: displayName ...

…to be provided with a roster as shown in figure [fig:msrl-roster-flat] upon connecting as user czesio.

Deep DIT

This type of DIT contains distinctly typed objects for users and groups – see figure [fig:msrl-dit-deep]. They are shown separated into different subtrees, but it’s not a requirement.

If you use the following example module configuration with it:

modules: ... mod_shared_roster_ldap: ldap_base: "ou=deep,dc=nodomain" ldap_rfilter: "(objectClass=groupOfUniqueNames)" ldap_filter: "" ldap_gfilter: "(&(objectClass=groupOfUniqueNames)(cn=%g))" ldap_groupdesc: description ldap_memberattr: uniqueMember ldap_memberattr_format: "cn=%u,ou=people,ou=deep,dc=nodomain" ldap_ufilter: "(&(objectClass=inetOrgPerson)(cn=%u))" ldap_userdesc: displayName ...

…and connect as user czesio, then ejabberd will provide you with the roster shown in figure [fig:msrl-roster-deep].

mod_sic

This module adds support for Server IP Check (XEP-0279). This protocol enables a client to discover its external IP address.

mod_sip

This module adds SIP proxy/registrar support for the corresponding virtual host. Note that it is not enough to just load this module only. You should also configure listeners and DNS records properly. See section SIP for the full explanation.

Example configuration:

modules: ... mod_sip: {} ...

Options:

record_route: SIP_URI: When the option always_record_route is set or when SIP outbound is utilized RFC 5626, ejabberd inserts Record-Route header field with this SIP_URI into a SIP message. The default is SIP URI constructed from the virtual host.

always_record_route: true|false: Always insert Record-Route header into SIP messages. This approach allows to bypass NATs/firewalls a bit more easily. The default is true.

routes: [SIP_URI]: You can set a list of SIP URIs of routes pointing to this proxy server. The default is a list of a SIP URI constructed from the virtual host.

flow_timeout_udp: Seconds: For SIP outbound UDP connections set a keep-alive timer to Seconds. The default is 29.

flow_timeout_tcp: Seconds: For SIP outbound TCP connections set a keep-alive timer to Seconds. The default is 120.

via: [{type: Type, host: Host, port: Port}]: With this option for every Type you can specify Host and Port to set in Via header of outgoing SIP messages, where Type can be udp, tcp or tls. Host is a string and Port is a non negative integer. This is useful if you’re running your server in a non-standard network topology.

Example complex configuration:

modules: ... mod_sip: always_record_route: false record_route: "sip:example.com;lr" routes: - "sip:example.com;lr" - "sip:sip.example.com;lr" flow_timeout_udp: 30 flow_timeout_tcp: 130 via: - type: tls host: sip-tls.example.com port: 5061 - type: tcp host: sip-tcp.example.com port: 5060 - type: udp host: sip-udp.example.com port: 5060 ...

mod_stats

This module adds support for Statistics Gathering (XEP-0039). This protocol allows you to retrieve next statistics from your ejabberd deployment:

• Total number of registered users on the current virtual host (users/total).

• Total number of registered users on all virtual hosts (users/all-hosts/total).

• Total number of online users on the current virtual host (users/online).

• Total number of online users on all virtual hosts (users/all-hosts/online).

As there are only a small amount of clients (for example Tkabber) and software libraries with support for this XEP, a few examples are given of the XML you need to send in order to get the statistics. Here they are:

• You can request the number of online users on the current virtual host (example.org) by sending:

• You can request the total number of registered users on all virtual hosts by sending:

mod_stream_mgmt

This module adds support for Stream Management (XEP-0198). This protocol allows active management of an XML stream between two XMPP entities, including features for stanza acknowledgements and stream resumption.

Options:

max_ack_queue: Size: This option specifies the maximum number of unacknowledged stanzas queued for possible retransmission. When the limit is exceeded, the client session is terminated. The allowed values are positive integers and infinity. You should be careful when setting this value as it should not be set too low, otherwise, you could killed sessions in loop, before they get the chance to finish proper session initiation. It should definitely be set higher that the size of the offline queue (for example at least 3 times the value of the max offline queue and never lower than 1000). Default value: 5000.

max_resume_timeout: Seconds: A client may specify the number of seconds until a session times out if the connection is lost. During this period of time, the client may resume the session. This option limits the number of seconds a client is permitted to request. It must be set to a number equal to or larger than the default resume_timeout (see below). By default, it is set to the same value as the resume_timeout option.

resend_on_timeout: true|false|if_offline: If this option is set to true, any message stanzas that weren’t acknowledged by the client will be resent on session timeout. This behavior might often be desired, but could have unexpected results under certain circumstances. For example, a message that was sent to two resources might get resent to one of them if the other one timed out. Therefore, the default value for this option is false, which tells ejabberd to generate an error message instead. As an alternative, the option may be set to if_offline. In this case, unacknowledged messages are resent only if no other resource is online when the session times out. Otherwise, error messages are generated.

resume_timeout: Seconds: This option configures the (default) number of seconds until a session times out if the connection is lost. During this period of time, a client may resume the session. (Note that the client may request a different timeout value, see the max_resume_timeout option above.) Setting it to 0 effectively disables session resumption. The default value is 300.

ack_timeout: Seconds: The default value is 60. Setting it to infinity effectively disables the timeout.

queue_type: Discipline: The default value is ram. The accepted values are ram and file.

mod_time

This module features support for Entity Time (XEP-0202). By using this XEP, you are able to discover the time at another entity’s location.

mod_vcard

This module allows end users to store and retrieve their vCard, and to retrieve other users vCards, as defined in vcard-temp (XEP-0054). The module also implements an uncomplicated Jabber User Directory based on the vCards of these users. Moreover, it enables the server to send its vCard when queried.

Options:

host: HostName: This option defines the Jabber ID of the service. If the host option is not specified, the Jabber ID will be the hostname of the virtual host with the prefix ‘vjud.’. The keyword “@HOST@” is replaced at start time with the real virtual host name.

db_type: mnesia|sql|ldap: Define the type of storage where the module will create the tables and store user information. The default is the storage defined by the global option default_db, or mnesia if omitted. If sql value is defined, make sure you have defined the database, see database. If ldap value is defined, check its specific options, see vCards in LDAP.

use_cache: false|true: Use this option and related ones as explained in section Caching.

search: true|false: This option specifies whether the search functionality is enabled or not. If disabled, the option host will be ignored and the Jabber User Directory service will not appear in the Service Discovery item list. The default value is false.

matches: infinity|Number: With this option, the number of reported search results can be limited. If the option’s value is set to infinity, all search results are reported. The default value is 30.

allow_return_all: false|true: This option enables you to specify if search operations with empty input fields should return all users who added some information to their vCard. The default value is false.

search_all_hosts, true|false: If this option is set to true, search operations will apply to all virtual hosts. Otherwise only the current host will be searched. The default value is true. This option is available in mod_vcard when using Mnesia, but not when using SQL storage.

Examples:

• In this first situation, search results are limited to twenty items, every user who added information to their vCard will be listed when people do an empty search, and only users from the current host will be returned:

modules: ... mod_vcard: search: true matches: 20 allow_return_all: true search_all_hosts: false ...

• The second situation differs in a way that search results are not limited, and that all virtual hosts will be searched instead of only the current one:

modules: ... mod_vcard: search: true matches: infinity allow_return_all: true ...

vCards in LDAP

ejabberd can map LDAP attributes to vCard fields. This feature is enabled when the mod_vcard module is configured with db_type: ldap. Notice that it does not depend on the authentication method (see LDAP Authentication).

Usually ejabberd treats LDAP as a read-only storage: it is possible to consult data, but not possible to create accounts or edit vCard that is stored in LDAP. However, it is possible to change passwords if mod_register module is enabled and LDAP server supports RFC 3062.

This feature has its own optional parameters. The first group of parameters has the same meaning as the top-level LDAP parameters to set the authentication method: ldap_servers, ldap_port, ldap_rootdn, ldap_password, ldap_base, ldap_uids, ldap_deref_aliases and ldap_filter. See section LDAP Authentication for detailed information about these options. If one of these options is not set, ejabberd will look for the top-level option with the same name.

The second group of parameters consists of the following mod_vcard-specific options:

host: HostName: This option defines the Jabber ID of the service. If the host option is not specified, the Jabber ID will be the hostname of the virtual host with the prefix ‘vjud.’. The keyword “@HOST@” is replaced at start time with the real virtual host name.

search: true|false: This option specifies whether the search functionality is enabled (value: true) or disabled (value: false). If disabled, the option host will be ignored and the Jabber User Directory service will not appear in the Service Discovery item list. The default value is false.

matches: infinity|Number: With this option, the number of reported search results can be limited. If the option’s value is set to infinity, all search results are reported. The default value is 30.

ldap_vcard_map: {Name: {Pattern, LDAPattributes}, ...}: With this option you can set the table that maps LDAP attributes to vCard fields. Name is the type name of the vCard as defined in RFC 2426. Pattern is a string which contains pattern variables %u, %d or %s. LDAPattributes is the list containing LDAP attributes. The pattern variables %s will be sequentially replaced with the values of LDAP attributes from List_of_LDAP_attributes, %u will be replaced with the user part of a JID, and %d will be replaced with the domain part of a JID. The default is:

 NICKNAME: {"%u": []}
 FN: {"%s": [displayName]}
 LAST: {"%s": [sn]}
 FIRST: {"%s": [givenName]}
 MIDDLE: {"%s": [initials]}
 ORGNAME: {"%s": [o]}
 ORGUNIT: {"%s": [ou]}
 CTRY: {"%s": [c]}
 LOCALITY: {"%s": [l]}
 STREET: {"%s": [street]}
 REGION: {"%s": [st]}
 PCODE: {"%s": [postalCode]}
 TITLE: {"%s": [title]}
 URL: {"%s": [labeleduri]}
 DESC: {"%s": [description]}
 TEL: {"%s": [telephoneNumber]}
 EMAIL: {"%s": [mail]}
 BDAY: {"%s": [birthDay]}
 ROLE: {"%s": [employeeType]}
 PHOTO: {"%s": [jpegPhoto]}

ldap_search_fields: {Name: Attribute, ...}: This option defines the search form and the LDAP attributes to search within. Name is the name of a search form field which will be automatically translated by using the translation files (see msgs/*.msg for available words). Attribute is the LDAP attribute or the pattern %u. The default is:

 User: "%u"
 "Full Name": displayName
 "Given Name": givenName
 "Middle Name": initials
 "Family Name": sn
 Nickname: "%u"
 Birthday: birthDay
 Country: c
 City: l
 Email: mail
 "Organization Name": o
 "Organization Unit": ou

ldap_search_reported: {SearchField: VcardField}, ...}: This option defines which search fields should be reported. SearchField is the name of a search form field which will be automatically translated by using the translation files (see msgs/*.msg for available words). VcardField is the vCard field name defined in the ldap_vcard_map option. The default is:

 "Full Name": FN
 "Given Name": FIRST
 "Middle Name": MIDDLE
 "Family Name": LAST
 "Nickname": NICKNAME
 "Birthday": BDAY
 "Country": CTRY
 "City": LOCALITY
 "Email": EMAIL
 "Organization Name": ORGNAME
 "Organization Unit": ORGUNIT

Examples:

• Let’s say ldap.example.org is the name of our LDAP server. We have users with their passwords in ou=Users,dc=example,dc=org directory. Also we have addressbook, which contains users emails and their additional infos in ou=AddressBook,dc=example,dc=org directory. Corresponding authentication section should looks like this:

## authentication method auth_method: ldap ## DNS name of our LDAP server ldap_servers: - ldap.example.org ## We want to authorize users from 'shadowAccount' object class only ldap_filter: "(objectClass=shadowAccount)"

Now we want to use users LDAP-info as their vCards. We have four attributes defined in our LDAP schema: mail — email address, givenName — first name, sn — second name, birthDay — birthday. Also we want users to search each other. Let’s see how we can set it up:

modules: mod_vcard: db_type: ldap ## We use the same server and port, but want to bind anonymously because ## our LDAP server accepts anonymous requests to ## "ou=AddressBook,dc=example,dc=org" subtree. ldap_rootdn: "" ldap_password: "" ## define the addressbook's base ldap_base: "ou=AddressBook,dc=example,dc=org" ## uidattr: user's part of JID is located in the "mail" attribute ## uidattr_format: common format for our emails ldap_uids: {"mail": "%u@mail.example.org"} ## Now we want to define vCard pattern ldap_vcard_map: NICKNAME: {"%u": []} # just use user's part of JID as their nickname FIRST: {"%s": [givenName]} LAST: {"%s": [sn]} FN: {"%s, %s": [sn, givenName]} # example: "Smith, John" EMAIL: {"%s": [mail]} BDAY: {"%s": [birthDay]} ## Search form ldap_search_fields: User: "%u" Name: givenName "Family Name": sn Email: mail Birthday: birthDay ## vCard fields to be reported ## Note that JID is always returned with search results ldap_search_reported: "Full Name": FN Nickname: NICKNAME Birthday: BDAY

Note that mod_vcard with LDAP backend checks an existence of the user before searching their info in LDAP.

• ldap_vcard_map example:

ldap_vcard_map: NICKNAME: {"%u": []} # just use user's part of JID as their nickname FN: {"%s": [displayName]} CTRY: {Russia: []} EMAIL: {"%u@%d": []} DESC: {"%s\n%s": [title, description]}

• ldap_search_fields example:

ldap_search_fields: User: uid "Full Name": displayName Email: mail

• ldap_search_reported example:

ldap_search_reported: "Full Name": FN Email: EMAIL Birthday: BDAY Nickname: NICKNAME

mod_vcard_xupdate

The user’s client can store an avatar in the user vCard. The vCard-Based Avatars protocol (XEP-0153) provides a method for clients to inform the contacts what is the avatar hash value. However, simple or small clients may not implement that protocol.

If this module is enabled, all the outgoing client presence stanzas get automatically the avatar hash on behalf of the client. So, the contacts receive the presence stanzas with the Update Data described in XEP-0153 as if the client would had inserted it itself. If the client had already included such element in the presence stanza, it is replaced with the element generated by ejabberd.

By enabling this module, each vCard modification produces a hash recalculation, and each presence sent by a client produces hash retrieval and a presence stanza rewrite. For this reason, enabling this module will introduce a computational overhead in servers with clients that change frequently their presence.

Supported options:

use_cache: false|true: Use this option and related ones as explained in section Caching.

mod_version

This module implements Software Version (XEP-0092). Consequently, it answers ejabberd’s version when queried.

Options:

show_os: true|false: Should the operating system be revealed or not. The default value is true.