• 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 2222
  
• 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)

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