NAME

       sasl_callbacks - How to work with SASL callbacks

SYNOPSIS

       #include <sasl/sasl.h>

DESCRIPTION

       sasl_callbacks  are used when the application needs some information from the application. Common reasons
       are getting for getting usernames and passwords. A client MUST specify what callbacks they support in the
       sasl_client/server_init() or sasl_client/server_new() calls.  If  an  authentication  mechanism  needs  a
       callback that the application does not state it supports it cannot be used.

       If  a  callback  has  an  id parameter that should be checked to make sure you are giving the appropriate
       value.

       If an application is using the client side of the library functions  to  handle  the  callbacks  are  not
       necessary.    Instead    the   application   may   deal   with   callbacks   via   SASL_INTERACT's.   See
       sasl_client_start/step() for more information.

       The list of callbacks follows:

Common Callbacks

       sasl_getopt_t
               Get an option value

       sasl_log_t
               Log message handler

       sasl_getpath_t
               Get path to search for plugins (e.g. SASL mechanisms)

       sasl_verifyfile_t
               Verify files for use by SASL

       sasl_canon_user_t
               Username canonicalization function.

Client-only Callbacks

       sasl_getsimple_t
               Get user/language list

       sasl_getsecret_t
               Get authentication secret

       sasl_chalprompt_t
               Display challenge and prompt for response

       sasl_getrealm_t
               Get the realm for authentication

Server-only Callbacks

       sasl_authorize_t
               Authorize policy callback

       sasl_server_userdb_checkpass_t
               verify plaintext password

       sasl_server_userdb_setpass_t
               set plaintext password

       sasl_getconfpath_t
               Get path to search for SASL configuration file (server side only). New in SASL 2.1.22.

RETURN VALUE

       SASL callback functions should return SASL  return  codes.  See  sasl.h  for  a  complete  list.  SASL_OK
       typically indicates success.

CONFORMING TO

       RFC 4422

SEE ALSO

       sasl(3),  sasl_errors(3),  sasl_authorize_t(3),  sasl_log_t(3), sasl_getpath_t(3), sasl_getconfpath_t(3),
       sasl_verifyfile_t(3), sasl_canon_user_t(3), sasl_getsimple(3), sasl_getsecret_t(3), sasl_chalprompt_t(3),
       sasl_getrealm_t(3),                sasl_authorize_t(3),                sasl_server_userdb_checkpass_t(3),
       sasl_server_userdb_setpass_t(3)

SASL                                            12 February 2006                               sasl_callbacks(3)