1 /*
2 * Copyright (c) 1999 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 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
39 const char* check_length(krb5_context, krb5_principal, krb5_data *);
40
41 /* specify the api-version this library conforms to */
42
43 int 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 */
48 const char*
check_length(krb5_context context,krb5_principal prinipal,krb5_data * password)49 check_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
68 const char*
check_cracklib(krb5_context context,krb5_principal principal,krb5_data * password)69 check_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