sasl_client_start - Man Page

Cyrus SASL documentation

Synopsis

#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);

Description

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

Return Value

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.

See Also

RFC 4422,:saslman:sasl(3), sasl_callbacks(3), sasl_client_init(3), sasl_client_new(3), sasl_client_step(3), sasl_errors(3)

Author

The Cyrus Team

Referenced By

sasl(3), sasl_callbacks(3), sasl_client_init(3), sasl_client_new(3), sasl_client_step(3).

November 08, 2018 2.1.27 Cyrus SASL