userblacklist Module

Hardy Kahl

   1&1 Internet AG

Edited by

Henning Westerholt

   1&1 Internet AG
   <henning.westerholt@1und1.de>

   Copyright © 2008 1&1 Internet AG
   Revision History
   Revision $Revision: 5906 $ $Date: 2009-07-21 10:45:05 +0300
                              (Tue, 21 Jul 2009) $
     __________________________________________________________

   Table of Contents

   1. Admin Guide

        1.1. Overview
        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. db_table (string)
              1.3.3. use_domain (integer)

        1.4. Exported Functions

              1.4.1. check_user_blacklist (string user, string
                      domain, string number, string table)

              1.4.2. check_blacklist (string table)

        1.5. MI Commands

              1.5.1. reload_blacklist

        1.6. Installation and Running

              1.6.1. Database setup

   List of Examples

   1.1. Set db_url parameter
   1.2. Set db_table parameter
   1.3. Set use_domain parameter
   1.4. check_user_blacklist usage
   1.5. check_blacklist usage
   1.6. reload_blacklists usage
   1.7. Example database content - globalblacklist table
   1.8. Example database content - userblacklist table

Chapter 1. Admin Guide

1.1. Overview

   The userblacklist module allows OpenSIPS to handle blacklists
   on a per user basis. This information is stored in a database
   table, which is queried to decide if the number (more exactly,
   the request URI user) is blacklisted or not.

   An additional functionality that this module provides is the
   ability to handle global blacklists. This lists are loaded on
   startup into memory, thus providing a better performance then
   in the userblacklist case. This global blacklists are useful to
   only allow calls to certain international destinations, i.e.
   block all not whitelisted numbers. They could also used to
   prevent the blacklisting of important numbers, as whitelisting
   is supported too. This is useful for example to prevent the
   customer from blocking emergency call number or service
   hotlines.

   The module exports two functions, check_blacklist and
   check_user_blacklist for usage in the config file. Furthermore
   its provide a FIFO function to reload the global blacklist
   cache.

1.2. Dependencies

1.2.1. OpenSIPS Modules

   The module depends on the following modules (in the other words
   the listed modules must be loaded before this module):
     * database -- Any database module

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 to the database containing the routing data.

   Default value is
   "mysql://opensipsro:opensipsro@localhost/opensips".

   Example 1.1. Set db_url parameter
...
modparam("userblacklist", "db_url", "dbdriver://username:password@dbhost
/dbname")
...

1.3.2. db_table (string)

   Name of the table where the user blacklist data is stored.

   Default value is "userblacklist".

   Example 1.2. Set db_table parameter
...
modparam("userblacklist", "db_table", "userblacklist")
...

1.3.3. use_domain (integer)

   If set to non-zero value, the domain column in the
   userblacklist is used.

   Default value is "0".

   Example 1.3. Set use_domain parameter
...
modparam("userblacklist", "use_domain", 0)
...

1.4. Exported Functions

1.4.1.  check_user_blacklist (string user, string domain, string
number, string table)

   Finds the longest prefix that matches the request URI user (or
   the number parameter) for the given user and domain name in the
   database. If a match is found and it is not set to whitelist,
   false is returned. Otherwise, true is returned.
   Pseudo-variables or AVPs can be used for the user, domain and
   number parameters. The number and table variables are optional,
   the defaults are used if they are ommited. The number parameter
   can be used to check for example against the from URI user.

   Example 1.4. check_user_blacklist usage
...
$avp(i:80) = $rU;
# rewrite the R-URI
if (!check_user_blacklist("$avp(i:80)", "$avp(i:82)"))
        sl_send_reply("403", "Forbidden");
        exit;
}
...

1.4.2.  check_blacklist (string table)

   Finds the longest prefix that matches the request URI for the
   given table. If a match is found and it is not set to
   whitelist, false is returned. Otherwise, true is returned.

   Example 1.5. check_blacklist usage
...
if (!check_blacklist("global_blacklist")))
        sl_send_reply("403", "Forbidden");
        exit;
}
...

1.5. MI Commands

1.5.1.  reload_blacklist

   Reload the internal global blacklist cache. This is necessary
   after the database tables for the global blacklist have been
   changed.

   Example 1.6. reload_blacklists usage
...
opensipsctl fifo reload_blacklist
...

1.6. Installation and Running

1.6.1. Database setup

   Before running OpenSIPS with userblacklist, you have to setup
   the database table where the module will read the blacklist
   data. For that, if the table was not created by the
   installation script or you choose to install everything by
   yourself you can use the userblacklist-create.sql SQL script in
   the database directories in the opensips/scripts folder as
   template. Database and table name can be set with module
   parameters so they can be changed, but the name of the columns
   must be as they are in the SQL script. You can also find the
   complete database documentation on the project webpage,
   http://www.opensips.org/html/docs/db/db-schema-devel.html.

   Example 1.7. Example database content - globalblacklist table
...
+----+-----------+-----------+
| id | prefix    | whitelist |
+----+-----------+-----------+
|  1 |           |         0 |
|  2 | 1         |         1 |
|  3 | 123456    |         0 |
|  4 | 123455787 |         0 |
+----+-----------+-----------+
...

   This table will setup a global blacklist for all numbers, only
   allowing calls starting with "1". Numbers that starting with
   "123456" and "123455787" are also blacklisted, because the
   longest prefix will be matched.

   Example 1.8. Example database content - userblacklist table
...
+----+----------------+-------------+-----------+-----------+
| id | username       | domain      | prefix    | whitelist |
+----+----------------+-------------+-----------+-----------+
| 23 | 49721123456788 |             | 1234      |         0 |
| 22 | 49721123456788 |             | 123456788 |         1 |
| 21 | 49721123456789 |             | 12345     |         0 |
| 20 | 494675231      |             | 499034133 |         1 |
| 19 | 494675231      | test        | 499034132 |         0 |
| 18 | 494675453      | test.domain | 49901     |         0 |
| 17 | 494675454      |             | 49900     |         0 |
+----+----------------+-------------+-----------+-----------+
...

   This table will setup user specific blacklists for certain
   usernames. For example for user "49721123456788" the prefix
   "1234" will be not allowed, but the number "123456788" is
   allowed. Additionally a domain could be specified that is used
   for username matching if the "use_domain" parameter is set.
