1/*	$NetBSD: otp_verify.c,v 1.2 2017/01/28 21:31:50 christos Exp $	*/
2
3/*
4 * Copyright (c) 1995 - 2000 Kungliga Tekniska H��gskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#ifdef HAVE_CONFIG_H
37#include "config.h"
38__RCSID("$NetBSD: otp_verify.c,v 1.2 2017/01/28 21:31:50 christos Exp $");
39#endif
40
41#include "otp_locl.h"
42
43int
44otp_verify_user_1 (OtpContext *ctx, const char *passwd)
45{
46  OtpKey key1, key2;
47
48  if (otp_parse (key1, passwd, ctx->alg)) {
49    ctx->err = "Syntax error in reply";
50    return -1;
51  }
52  memcpy (key2, key1, sizeof(key1));
53  ctx->alg->next (key2);
54  if (memcmp (ctx->key, key2, sizeof(key2)) == 0) {
55    --ctx->n;
56    memcpy (ctx->key, key1, sizeof(key1));
57    return 0;
58  } else
59    return -1;
60}
61
62int
63otp_verify_user (OtpContext *ctx, const char *passwd)
64{
65  void *dbm;
66  int ret;
67
68  if (!ctx->challengep)
69    return -1;
70  ret = otp_verify_user_1 (ctx, passwd);
71  dbm = otp_db_open ();
72  if (dbm == NULL) {
73    free(ctx->user);
74    return -1;
75  }
76  otp_put (dbm, ctx);
77  free(ctx->user);
78  otp_db_close (dbm);
79  return ret;
80}
81