xstep.c

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/* xstep.c --- Perform one SASL authentication step.
 * Copyright (C) 2002-2024 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 License along with GNU SASL Library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */
 
#include <config.h>
#include "internal.h"
 
int
gsasl_step (Gsasl_session *sctx,
            const char *input, size_t input_len,
            char **output, size_t *output_len)
{
  Gsasl_step_function step;
 
  if (sctx->clientp)
    step = sctx->mech->client.step;
  else
    step = sctx->mech->server.step;
 
  return step (sctx, sctx->mech_data, input, input_len, output, output_len);
}
 
int
gsasl_step64 (Gsasl_session *sctx, const char *b64input, char **b64output)
{
  size_t input_len = 0, output_len = 0;
  char *input = NULL, *output = NULL;
  int res;
 
  if (b64input)
    {
      res = gsasl_base64_from (b64input, strlen (b64input),
                               &input, &input_len);
      if (res != GSASL_OK)
        return GSASL_BASE64_ERROR;
    }
 
  res = gsasl_step (sctx, input, input_len, &output, &output_len);
 
  free (input);
 
  if (res == GSASL_OK || res == GSASL_NEEDS_MORE)
    {
      int tmpres = gsasl_base64_to (output, output_len, b64output, NULL);
 
      free (output);
 
      if (tmpres != GSASL_OK)
        return tmpres;
    }
 
  return res;
}