
UAC Module

Ramona-Elena Modroiu

   Voice System

Edited by

Ramona-Elena Modroiu

   Copyright © 2005 Voice Sistem
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   Table of Contents
   1. User's Guide

        1.1. Overview
        1.2. Dependencies

              1.2.1. OpenSER Modules
              1.2.2. External Libraries or Applications

        1.3. Exported Parameters

              1.3.1. rr_store_param (string)
              1.3.2. from_restore_mode (string)
              1.3.3. from_passwd (string)
              1.3.4. credential (string)
              1.3.5. auth_realm_avp (string)
              1.3.6. auth_username_avp (string)
              1.3.7. auth_password_avp (string)

        1.4. Exported Functions

              1.4.1. uac_replace_from(display,uri)
              1.4.2. uac_replace_from(uri)
              1.4.3. uac_restore_from()
              1.4.4. uac_auth()

   2. Developer's Guide
   3. Frequently Asked Questions

   List of Examples
   1-1. Set rr_store_param parameter
   1-2. Set from_restore_mode parameter
   1-3. Set from_passwd parameter
   1-4. Set credential parameter
   1-5. Set auth_realm_avp parameter
   1-6. Set auth_username_avp parameter
   1-7. Set auth_password_avp parameter
   1-8. uac_replace_from usage
   1-9. uac_replace_from usage
   1-10. uac_restore_from usage
   1-11. uac_auth usage
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Chapter 1. User's Guide

1.1. Overview

   UAC (User Agent Client) module provides some basic UAC
   functionalities like FROM header manipulation (anonymization)
   or client authentication.

   Known limitations in this version:

     * authentication does not support qop;
     * CSeq not increased during authentication - the response
       may be rejected.
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1.2. Dependencies

1.2.1. OpenSER Modules

   The following modules must be loaded before this module:

     * TM - Transaction Module
     * RR - Record-Route Module, but only if restore mode for
       FROM URI is set to "auto".
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1.2.2. External Libraries or Applications

   The following libraries or applications must be installed
   before running OpenSER with this module loaded:

     * None
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1.3. Exported Parameters

1.3.1. rr_store_param (string)

   Name of Record-Route header parameter that will be used to
   store (encoded) the original FROM URI.

   This parameter is optional, it's default value being "vsf". 

   Example 1-1. Set rr_store_param parameter
...
modparam("uac","rr_store_param","my_param")
...
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1.3.2. from_restore_mode (string)

   There are 3 mode of restoring the original FROM URI:

     * "none" - no information about original URI is stored;
       restoretion is not possible.
     * "manual" - all following replies will be restored, but not
       also the sequential requests - this must be manually
       updated based on original URI.
     * "auto" - all sequential requests and replies will be
       automatically updated based on stored original URI.

   This parameter is optional, it's default value being "auto". 

   Example 1-2. Set from_restore_mode parameter 
...
modparam("uac","from_restore_mode","auto")
...
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1.3.3. from_passwd (string)

   String password to be used to encrypt the RR storing paramter.
   If empty, no encryption will be used.

   Default value of this parameter is empty. 

   Example 1-3. Set from_passwd parameter
...
modparam("uac","from_passwd","my_secret_passwd")
...
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1.3.4. credential (string)

   Contains a multiple definition of credentials used to perform
   authentication.

   This parameter is required if UAC authentication is used. 

   Example 1-4. Set credential parameter
...
modparam("uac","credential","username:domain:password")
...
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1.3.5. auth_realm_avp (string)

   The definition of an AVP that might contain the realm to be
   used to perform authentication.

   If you define it, you also need to define "auth_username_avp"
   (Section 1.3.6) and "auth_username_avp" (Section 1.3.7). 

   Example 1-5. Set auth_realm_avp parameter
...
modparam("uac","auth_realm_avp","$avp(i:10)")
...
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1.3.6. auth_username_avp (string)

   The definition of an AVP that might contain the username to be
   used to perform authentication.

   If you define it, you also need to define "auth_realm_avp"
   (Section 1.3.5) and "auth_username_avp" (Section 1.3.7). 

   Example 1-6. Set auth_username_avp parameter
...
modparam("uac","auth_username_avp","$avp(i:11)")
...
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1.3.7. auth_password_avp (string)

   The definition of an AVP that might contain the password to be
   used to perform authentication.

   If you define it, you also need to define "auth_password_avp"
   (Section 1.3.7) and "auth_username_avp" (Section 1.3.7). 

   Example 1-7. Set auth_password_avp parameter
...
modparam("uac","auth_password_avp","$avp(i:12)")
...
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1.4. Exported Functions

1.4.1. uac_replace_from(display,uri)

   Replace in FROM header the display name and the URI part.

   display and URI parameters can include pseudo-variables.

   This function can be used from REQUEST_ROUTE.

   Example 1-8. uac_replace_from usage
...
# replace both display and uri
uac_replace_from("$avp(s:display)","$avp(s:uri)");
# replace only display and do not touch uri
uac_replace_from("batman","");
# remove display and replace uri
uac_replace_from("","sip:robin@gotham.org");
# remove display and do not touch uri
uac_replace_from("","");
...
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1.4.2. uac_replace_from(uri)

   Replace in FROM header the the URI part without altering the
   display name.

   URI parameter can include pseudo-variables.

   This function can be used from REQUEST_ROUTE.

   Example 1-9. uac_replace_from usage
...
uac_replace_from("sip:batman@gotham.org");
...
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1.4.3. uac_restore_from()

   This function will check if the FROM URI was modified and will
   use the information stored in header parameter to restore the
   original FROM URI value.

   This function can be used from REQUEST_ROUTE.

   Example 1-10. uac_restore_from usage
...
uac_restore_from();
...
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1.4.4. uac_auth()

   This function can be called only from failure route and will
   build the authentication response header and insert it into
   the request without sending anything.

   This function can be used from FAILURE_ROUTE.

   Example 1-11. uac_auth usage
...
uac_auth();
...
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Chapter 2. Developer's Guide

   The module does not provide any API to use in other OpenSER
   modules.
     _________________________________________________________

Chapter 3. Frequently Asked Questions

   3.1. Where can I find more about OpenSER?
   3.2. Where can I post a question about this module?
   3.3. How can I report a bug?

   3.1. Where can I find more about OpenSER?

   Take a look at http://openser.org/.

   3.2. Where can I post a question about this module?

   First at all check if your question was already answered on
   one of our mailing lists:

     * User Mailing List -
       http://openser.org/cgi-bin/mailman/listinfo/users
     * Developer Mailing List -
       http://openser.org/cgi-bin/mailman/listinfo/devel

   E-mails regarding any stable version should be sent to
   <users@openser.org> and e-mail regarding development versions
   or CVS snapshots should be send to <devel@openser.org>.

   If you want to keep the mail private, send it to
   <team@openser.org>.

   3.3. How can I report a bug?

   Please follow the guidelines provided at:
   http://sourceforge.net/tracker/?group_id=139143
