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"
36RCSID("$Id$");
37#endif
38
39#include "otp_locl.h"
40
41int
42otp_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
60int
61otp_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}
79