sasl_client_start - Cyrus SASL documentation

       The Cyrus Team

       1993-2016, The Cyrus Team

2.1.28                                             2025-02-28                               SASL_CLIENT_START(3)

intsasl_client_start(sasl_conn_t*conn,constchar*mechlist,sasl_interact_t**prompt_need,constchar**clientout,unsigned*clientoutlen,constchar**mech);sasl_client_start()  selects a mechanism for authentication and starts the authentication session.
              The mechlist is the list of mechanisms the client might like to use. The mech‐ anisms in the  list
              are  not necessarily  supported by  the client  or  even  valid. SASL determines which of these to
              use based upon the security preferences specified earlier. The  list  of mechanisms is typically a
              list of mechanisms the server supports acquired from a capability request.

              If SASL_INTERACT is returned the library needs some values  to   be  filled   in   before  it  can
              proceed.  The  prompt_need  structure  will  be  filled  in  with requests. The application should
              fulfill   these  requests  and  call  sasl_client_start  again  with  identical  parameters   (the
              prompt_need parameter will  be  the  same pointer as before but filled in by the application).

              Parameters

                     • conn – is the SASL connection context

                     • mechlist – is a list of mechanisms the server has available.  Punctuation is ignored.

                     • prompt_need – is filled in with a list of prompts needed to continue (if necessary).

                     • clientout –

                       is  created.  It is  the  initial client  response  to  send to the server. It is the job
                       of the client to send it over the network to the server.  Any protocol  specific encoding
                       (such as base64 encoding) necessary needs to be done by the client.

                       If the protocol lacks client‐send‐first  capability,  then set clientout to NULL.

                       If  there  is no initial client‐send, then *clientout will be set to NULL on return.

                     • clientoutlen – length of clientout.

                     • mech – contains the name of the chosen  SASL mechanism  (on success)

       sasl_client_start - Cyrus SASL documentation

       SASL  callback  functions should return SASL return codes.  See sasl.h for a complete list. SASL_CONTINUE
       indicates success and that there are more steps needed in the authentication.

       Other return codes indicate errors and should either be handled or the authentication session  should  be
       quit.

RFC4422,:saslman:sasl(3),      sasl_callbacks(3),      sasl_client_init(3),     sasl_client_new(3),
       sasl_client_step(3), sasl_errors(3)

       #include <sasl/sasl.h>

       int sasl_client_start(sasl_conn_t * conn,
               const char * mechlist,
               sasl_interact_t ** prompt_need,
               const char ** clientout,
               unsigned * clientoutlen,
               const char ** mech);