lib/external/server.c

   1 /* server.c --- EXTERNAL mechanism as defined in RFC 2222, server side.
   2  * Copyright (C) 2002, 2003, 2004, 2005  Simon Josefsson
   3  *
   4  * This file is part of GNU SASL Library.
   5  *
   6  * GNU SASL Library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public License
   8  * as published by the Free Software Foundation; either version 2.1 of
   9  * the License, or (at your option) any later version.
  10  *
  11  * GNU SASL Library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with GNU SASL Library; if not, write to the Free
  18  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19  * Boston, MA 02110-1301, USA.
  20  *
  21  */
  22
  23 #if HAVE_CONFIG_H
  24 # include "config.h"
  25 #endif
  26
  27 /* Get specification. */
  28 #include "external.h"
  29
  30 /* Get memchr. */
  31 #include <string.h>
  32
  33 int
  34 _gsasl_external_server_step (Gsasl_session * sctx,
  35                              void *mech_data,
  36                              const char *input, size_t input_len,
  37                              char **output, size_t * output_len)
  38 {
  39   *output_len = 0;
  40   *output = NULL;
  41
  42   if (!input)
  43     return GSASL_NEEDS_MORE;
  44
  45   /* Quoting rfc2222bis-09:
  46    * extern-resp       = *( UTF8-char-no-nul )
  47    * UTF8-char-no-nul  = UTF8-1-no-nul / UTF8-2 / UTF8-3 / UTF8-4
  48    * UTF8-1-no-nul     = %x01-7F */
  49   if (memchr (input, '\0', input_len))
  50     return GSASL_MECHANISM_PARSE_ERROR;
  51
  52   /* FIXME: Validate that input is UTF-8. */
  53
  54   if (input_len > 0)
  55     gsasl_property_set_raw (sctx, GSASL_AUTHZID, input, input_len);
  56   else
  57     gsasl_property_set (sctx, GSASL_AUTHZID, NULL);
  58
  59   return gsasl_callback (NULL, sctx, GSASL_VALIDATE_EXTERNAL);
  60 }