lib/gs2/gs2wrap.c

   1 /* gs2parser.h --- GS2 parser.
   2  * Copyright (C) 2006  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 #include "gs2parser.h"
  24
  25 #include <stdint.h>
  26
  27 /*
  28  *
  29  *  1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
  30  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  31  *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  32  *  |  client_qops  |               client_maxbuf                   |
  33  *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  34  *  |                   channel_binding_length                      |
  35  *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  36  *  |[client_cbqops]|          [channel_binding_data]               /
  37  *  /                                                               /
  38  *  /                         /      [authzid]                      /
  39  *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  40  *
  41  */
  42 int
  43 gs2_parse_request (const char *request, size_t reqlen,
  44                    int clientp,
  45                    int *qop, size_t *maxbuf, size_t *cblen,
  46                    int *cbqops, char **cbdata, char **authzid)
  47 {
  48   size_t l;
  49
  50   if (reqlen < 8)
  51     return -1;
  52
  53   if (qop)
  54     *qop = request[0];
  55
  56   if (maxbuf)
  57     *maxbuf =
  58       (request[1] << 16) & 0xFF0000 |
  59       (request[2] << 8) & 0xFF00 |
  60       (request[3]) & 0xFF;
  61
  62   l = (request[4] << 24) & 0xFF000000 |
  63     (request[5] << 16) & 0xFF0000 |
  64     (request[6] << 8) & 0xFF00 |
  65     (request[7]) & 0xFF;
  66
  67   if (l > 0 && reqlen == 8)
  68     return -2;
  69
  70   if (cblen)
  71     *cblen = l;
  72
  73   if (l > 0)
  74     {
  75       if (cbqops)
  76         *cbqops = request[8];
  77       if (cbdata)
  78         *cbdata = &request[9];
  79       if (authzid)
  80         *authzid = &request[9] + l;
  81     }
  82   else
  83     {
  84       if (cbqops)
  85         *cbqops = 0;
  86       if (cbdata)
  87         *cbdata = NULL;
  88       if (authzid)
  89         *authzid = NULL;
  90     }
  91
  92   return 0;
  93 }