1/*
2 * Copyright (c) 1999 Kungliga Tekniska H��gskolan
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 KTH nor the names of its contributors may be
18 *    used to endorse or promote products derived from this software without
19 *    specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY KTH AND ITS CONTRIBUTORS ``AS IS'' AND ANY
22 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL KTH OR ITS CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
32
33/* $Id$ */
34
35#include <string.h>
36#include <stdlib.h>
37#include <krb5.h>
38
39const char* check_length(krb5_context, krb5_principal, krb5_data *);
40
41/* specify the api-version this library conforms to */
42
43int version = 0;
44
45/* just check the length of the password, this is what the default
46   check does, but this lets you specify the minimum length in
47   krb5.conf */
48const char*
49check_length(krb5_context context,
50             krb5_principal prinipal,
51             krb5_data *password)
52{
53    int min_length = krb5_config_get_int_default(context, NULL, 6,
54						 "password_quality",
55						 "min_length",
56						 NULL);
57    if(password->length < min_length)
58	return "Password too short";
59    return NULL;
60}
61
62#ifdef DICTPATH
63
64/* use cracklib to check password quality; this requires a patch for
65   cracklib that can be found at
66   ftp://ftp.pdc.kth.se/pub/krb/src/cracklib.patch */
67
68const char*
69check_cracklib(krb5_context context,
70	       krb5_principal principal,
71	       krb5_data *password)
72{
73    char *s = malloc(password->length + 1);
74    char *msg;
75    char *strings[2];
76    if(s == NULL)
77	return NULL; /* XXX */
78    strings[0] = principal->name.name_string.val[0]; /* XXX */
79    strings[1] = NULL;
80    memcpy(s, password->data, password->length);
81    s[password->length] = '\0';
82    msg = FascistCheck(s, DICTPATH, strings);
83    memset(s, 0, password->length);
84    free(s);
85    return msg;
86}
87#endif
88