lib/otp/otp_verify.c

   1 /*
   2  * Copyright (c) 1995 - 2000 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include "config.h"
  36 RCSID("$Id$");
  37 #endif
  38
  39 #include "otp_locl.h"
  40
  41 int
  42 otp_verify_user_1 (OtpContext *ctx, const char *passwd)
  43 {
  44   OtpKey key1, key2;
  45
  46   if (otp_parse (key1, passwd, ctx->alg)) {
  47     ctx->err = "Syntax error in reply";
  48     return -1;
  49   }
  50   memcpy (key2, key1, sizeof(key1));
  51   ctx->alg->next (key2);
  52   if (memcmp (ctx->key, key2, sizeof(key2)) == 0) {
  53     --ctx->n;
  54     memcpy (ctx->key, key1, sizeof(key1));
  55     return 0;
  56   } else
  57     return -1;
  58 }
  59
  60 int
  61 otp_verify_user (OtpContext *ctx, const char *passwd)
  62 {
  63   void *dbm;
  64   int ret;
  65
  66   if (!ctx->challengep)
  67     return -1;
  68   ret = otp_verify_user_1 (ctx, passwd);
  69   dbm = otp_db_open ();
  70   if (dbm == NULL) {
  71     free(ctx->user);
  72     return -1;
  73   }
  74   otp_put (dbm, ctx);
  75   free(ctx->user);
  76   otp_db_close (dbm);
  77   return ret;
  78 }