group Module
     __________________________________________________________

   Table of Contents

   1. Admin Guide

        1.1. Overview

              1.1.1. Strict membership checking
              1.1.2. Regular Expression based checking

        1.2. Dependencies

              1.2.1. OpenSIPS Modules
              1.2.2. External Libraries or Applications

        1.3. Exported Parameters

              1.3.1. db_url (string)
              1.3.2. table (string)
              1.3.3. user_column (string)
              1.3.4. domain_column (string)
              1.3.5. group_column (string)
              1.3.6. use_domain (integer)
              1.3.7. re_table (string)
              1.3.8. re_exp_column (string)
              1.3.9. re_gid_column (string)
              1.3.10. multiple_gid (integer)
              1.3.11. aaa_url (string)

        1.4. Exported Functions

              1.4.1. db_is_user_in(uri, group)
              1.4.2. db_get_user_group(uri, output_avp)
              1.4.3. aaa_is_user_in(uri, group)

   2. Contributors

        2.1. By Commit Statistics
        2.2. By Commit Activity

   3. Documentation

        3.1. Contributors

   List of Tables

   2.1. Top contributors by DevScore^(1), authored commits^(2) and
          lines added/removed^(3)

   2.2. Most recently active contributors^(1) to this module

   List of Examples

   1.1. Set db_url parameter
   1.2. Set table parameter
   1.3. Set user_column parameter
   1.4. Set domain_column parameter
   1.5. Set group_column parameter
   1.6. Set use_domain parameter
   1.7. Set re_table parameter
   1.8. Set reg_exp_column parameter
   1.9. Set re_gid_column parameter
   1.10. Set multiple_gid parameter
   1.11. Set aaa_url parameter
   1.12. db_is_user_in usage
   1.13. db_get_user_group usage
   1.14. aaa_is_user_in usage

Chapter 1. Admin Guide

1.1. Overview

   This module provides functionalities for different methods of
   group membership checking.

1.1.1. Strict membership checking

   There is a database table that contains list of users and
   groups they belong to. The module provides the possibility to
   check if a specific user belongs to a specific group.

   There is no DB caching support, each check involving a DB
   query.

1.1.2. Regular Expression based checking

   Another database table contains list of regular expressions and
   group IDs. A matching occurs if the user URI match the regular
   expression. This type of matching may be used to fetch the
   group ID(s) the user belongs to (via RE matching) .

   Due performance reasons (regular expression evaluation), DB
   cache support is available: the table content is loaded into
   memory at startup and all regular expressions are compiled.

1.2. Dependencies

1.2.1. OpenSIPS Modules

   The following modules must be loaded before this module:
     * A database module, like mysql, postgres or dbtext.
     * An AAA module, like radius or diameter.

1.2.2. External Libraries or Applications

   The following libraries or applications must be installed
   before running OpenSIPS with this module loaded:
     * None.

1.3. Exported Parameters

1.3.1. db_url (string)

   URL of the database table to be used.

   Example 1.1. Set db_url parameter

...
modparam("group", "db_url", "mysql://username:password@dbhost/opensips")
...


1.3.2. table (string)

   Name of the table holding strict definitions of groups and
   their members.

   Default value is “grp”.

   Example 1.2. Set table parameter

...
modparam("group", "table", "grp_table")
...


1.3.3. user_column (string)

   Name of the “table” column holding usernames.

   Default value is “username”.

   Example 1.3. Set user_column parameter

...
modparam("group", "user_column", "user")
...


1.3.4. domain_column (string)

   Name of the “table” column holding domains.

   Default value is “domain”.

   Example 1.4. Set domain_column parameter

...
modparam("group", "domain_column", "realm")
...


1.3.5. group_column (string)

   Name of the “table” column holding groups.

   Default value is “grp”.

   Example 1.5. Set group_column parameter

...
modparam("group", "group_column", "grp")
...


1.3.6. use_domain (integer)

   If enabled (set to non zero value) then domain will be used
   also used for strict group matching; otherwise only the
   username part will be used.

   Default value is 0 (no).

   Example 1.6. Set use_domain parameter

...
modparam("group", "use_domain", 1)
...


1.3.7. re_table (string)

   Name of the table holding definitions for regular-expression
   based groups. If no table is defined, the regular-expression
   support is disabled.

   Default value is “NULL”.

   Example 1.7. Set re_table parameter

...
modparam("group", "re_table", "re_grp")
...


1.3.8. re_exp_column (string)

   Name of the “re_table” column holding the regular expression
   used for user matching.

   Default value is “reg_exp”.

   Example 1.8. Set reg_exp_column parameter

...
modparam("group", "reg_exp_column", "re")
...


1.3.9. re_gid_column (string)

   Name of the “re_table” column holding the group IDs.

   Default value is “group_id”.

   Example 1.9. Set re_gid_column parameter

...
modparam("group", "re_gid_column", "grp_id")
...


1.3.10. multiple_gid (integer)

   If enabled (non zero value) the regular-expression matching
   will return all group IDs that match the user; otherwise only
   the first will be returned.

   Default value is “1”.

   Example 1.10. Set multiple_gid parameter

...
modparam("group", "multiple_gid", 0)
...


1.3.11. aaa_url (string)

   This is the url representing the AAA protocol used and the
   location of the configuration file of this protocol.

   Example 1.11. Set aaa_url parameter
...
modparam("group", "aaa_url", "radius:/etc/radiusclient-ng/radiusclient.c
onf")
...


1.4. Exported Functions

1.4.1.  db_is_user_in(uri, group)

   This function is to be used for script group membership. The
   function returns true if username in the given URI is member of
   the given group and false if not.

   Meaning of the parameters is as follows:
     * uri (string) - a SIP URI whose username and optionally
       domain to be used. Possible values:
          + "Request-URI" - Use Request-URI username and
            (optionally) domain.
          + "To" - Use To username and (optionally) domain.
          + "From" - Use From username and (optionally) domain.
          + "Credentials" - Use digest credentials username.
          + (default) - parse the given input as a SIP URI
     * group (string) - the group to check

   This function can be used from REQUEST_ROUTE and FAILURE_ROUTE.

   Example 1.12. db_is_user_in usage

...
if (db_is_user_in("Request-URI", "ld")) {
        ...
}
...
$avp(grouptocheck)="offline";

if (db_is_user_in("Credentials", $avp(grouptocheck))) {
        ...
}
...


1.4.2.  db_get_user_group(uri, output_avp)

   This function is to be used for regular expression based group
   membership, using DB support. The function returns true if the
   username in the given "uri" belongs to at least one group.

   All matching group IDs shall be returned in "output_avp" if
   multiple_gid is enabled, otherwise only the first one to match
   (the records are attempted in reversed order of the results
   returned by the RDBMS).

   Meaning of the parameters is as follows:
     * uri (string) - a SIP URI to be matched against the regular
       expressions:
          + "Request-URI" - Use Request-URI
          + "To" - Use To URI.
          + "From" - Use From URI
          + "Credentials" - Use digest credentials username and
            realm.
          + (default) - parse the given input as a SIP URI
     * output_avp (var) - a list of matched group IDs

   This function can be used from REQUEST_ROUTE and FAILURE_ROUTE.

   Example 1.13. db_get_user_group usage

...
if (db_get_user_group("Request-URI", $avp(10))) {
    xdbg("User $ru belongs to the following groups: $(avp(10)[*])\n");
    ....
};
...


1.4.3.  aaa_is_user_in(uri, group)

   This function checks group membership, using AAA support. The
   function returns true if username in the given "uri" is member
   of the given group and false if not.

   Meaning of the parameters is as follows:
     * uri (string) - a SIP URI whose username and optionally
       domain to be used, this can be one of:
          + "Request-URI" - Use Request-URI username and
            (optionally) domain.
          + "To" - Use To username and (optionally) domain.
          + "From" - Use From username and (optionally) domain.
          + "Credentials" - Use digest credentials username.
     * group (string) - Name of the group to check.

   This function can be used from REQUEST_ROUTE.

   Example 1.14. aaa_is_user_in usage

...
if (aaa_is_user_in("Request-URI", "ld")) {
        ...
};
...


Chapter 2. Contributors

2.1. By Commit Statistics

   Table 2.1. Top contributors by DevScore^(1), authored
   commits^(2) and lines added/removed^(3)
     Name DevScore Commits Lines ++ Lines --
   1. Bogdan-Andrei Iancu (@bogdan-iancu) 45 30 848 395
   2. Jan Janak (@janakj) 34 20 1370 148
   3. Daniel-Constantin Mierla (@miconda) 25 18 176 226
   4. Liviu Chircu (@liviuchircu) 14 10 80 132
   5. Irina-Maria Stanescu 10 4 466 59
   6. Andrei Pelinescu-Onciul 7 5 101 40
   7. Henning Westerholt (@henningw) 7 5 27 46
   8. Razvan Crainea (@razvancrainea) 5 3 13 11
   9. Vlad Patrascu (@rvlad-patrascu) 5 2 78 106
   10. Edson Gellert Schubert 5 1 0 206

   All remaining contributors: Jiri Kuthan (@jiriatipteldotorg),
   Dan Pascu (@danpascu), Sergio Gutierrez, Konstantin Bokarius,
   Norman Brandinger (@NormB), UnixDev, Anca Vamanu, Peter
   Lemenkov (@lemenkov).

   (1) DevScore = author_commits + author_lines_added /
   (project_lines_added / project_commits) + author_lines_deleted
   / (project_lines_deleted / project_commits)

   (2) including any documentation-related commits, excluding
   merge commits. Regarding imported patches/code, we do our best
   to count the work on behalf of the proper owner, as per the
   "fix_authors" and "mod_renames" arrays in
   opensips/doc/build-contrib.sh. If you identify any
   patches/commits which do not get properly attributed to you,
   please submit a pull request which extends "fix_authors" and/or
   "mod_renames".

   (3) ignoring whitespace edits, renamed files and auto-generated
   files

2.2. By Commit Activity

   Table 2.2. Most recently active contributors^(1) to this module
                      Name                   Commit Activity
   1.  Dan Pascu (@danpascu)               Oct 2007 - Apr 2019
   2.  Liviu Chircu (@liviuchircu)         Mar 2014 - Apr 2019
   3.  Bogdan-Andrei Iancu (@bogdan-iancu) Jul 2005 - Apr 2019
   4.  Vlad Patrascu (@rvlad-patrascu)     May 2017 - Apr 2019
   5.  Peter Lemenkov (@lemenkov)          Jun 2018 - Jun 2018
   6.  Razvan Crainea (@razvancrainea)     Jun 2011 - Aug 2015
   7.  Irina-Maria Stanescu                Aug 2009 - Dec 2009
   8.  Anca Vamanu                         Sep 2009 - Sep 2009
   9.  UnixDev                             Feb 2009 - Feb 2009
   10. Sergio Gutierrez                    Dec 2008 - Dec 2008

   All remaining contributors: Henning Westerholt (@henningw),
   Daniel-Constantin Mierla (@miconda), Konstantin Bokarius, Edson
   Gellert Schubert, Norman Brandinger (@NormB), Jan Janak
   (@janakj), Andrei Pelinescu-Onciul, Jiri Kuthan
   (@jiriatipteldotorg).

   (1) including any documentation-related commits, excluding
   merge commits

Chapter 3. Documentation

3.1. Contributors

   Last edited by: Liviu Chircu (@liviuchircu), Peter Lemenkov
   (@lemenkov), Bogdan-Andrei Iancu (@bogdan-iancu), Razvan
   Crainea (@razvancrainea), Irina-Maria Stanescu, Sergio
   Gutierrez, Daniel-Constantin Mierla (@miconda), Konstantin
   Bokarius, Edson Gellert Schubert, Dan Pascu (@danpascu), Jan
   Janak (@janakj).

   Documentation Copyrights:

   Copyright © 2009 Voice Sistem SRL

   Copyright © 2003 FhG FOKUS
