login/client.c

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/* client.c --- Non-standard SASL mechanism LOGIN, client side.
 * Copyright (C) 2002-2025 Simon Josefsson
 *
 * This file is part of GNU SASL Library.
 *
 * GNU SASL Library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * GNU SASL Library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with GNU SASL Library; if not, see
 * <https://www.gnu.org/licenses/>.
 *
 */
 
#include <config.h>
 
/* Get malloc, free. */
#include <stdlib.h>
 
/* Get strlen. */
#include <string.h>
 
/* Get specification. */
#include "login.h"
 
struct _Gsasl_login_client_state
{
  int step;
};
 
int
_gsasl_login_client_start (Gsasl_session *sctx _GL_UNUSED, void **mech_data)
{
  struct _Gsasl_login_client_state *state;
 
  state = malloc (sizeof (*state));
  if (state == NULL)
    return GSASL_MALLOC_ERROR;
 
  state->step = 0;
 
  *mech_data = state;
 
  return GSASL_OK;
}
 
int
_gsasl_login_client_step (Gsasl_session *sctx _GL_UNUSED,
                          void *mech_data,
                          const char *input _GL_UNUSED,
                          size_t input_len _GL_UNUSED,
                          char **output, size_t *output_len)
{
  struct _Gsasl_login_client_state *state = mech_data;
  const char *p;
  int res;
 
  switch (state->step)
    {
    case 0:
      p = gsasl_property_get (sctx, GSASL_AUTHID);
      if (!p)
        return GSASL_NO_AUTHID;
 
      *output = strdup (p);
      *output_len = strlen (p);
 
      state->step++;
      res = GSASL_NEEDS_MORE;
      break;
 
    case 1:
      p = gsasl_property_get (sctx, GSASL_PASSWORD);
      if (!p)
        return GSASL_NO_PASSWORD;
 
      *output = strdup (p);
      if (!*output)
        return GSASL_MALLOC_ERROR;
      *output_len = strlen (*output);
 
      state->step++;
      res = GSASL_OK;
      break;
 
    default:
      res = GSASL_MECHANISM_CALLED_TOO_MANY_TIMES;
      break;
    }
 
  return res;
}
 
void
_gsasl_login_client_finish (Gsasl_session *sctx _GL_UNUSED, void *mech_data)
{
  struct _Gsasl_login_client_state *state = mech_data;
 
  if (!state)
    return;
 
  free (state);
}