crypt.c revision 115720 
1/*
2 * Copyright (c) 1999
3 *      Mark Murray.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY MARK MURRAY AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL MARK MURRAY OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/lib/libcrypt/crypt.c 115720 2003-06-02 19:29:27Z markm $");
29
30#include <sys/types.h>
31#include <string.h>
32#include <libutil.h>
33#include <unistd.h>
34#include "crypt.h"
35
36static const struct {
37	const char *const name;
38	char *(*const func)(const char *, const char *);
39	const char *const magic;
40} crypt_types[] = {
41#ifdef HAS_DES
42	{
43		"des",
44		crypt_des,
45		NULL
46	},
47#endif
48	{
49		"md5",
50		crypt_md5,
51		"$1$"
52	},
53#ifdef HAS_BLOWFISH
54	{
55		"blf",
56		crypt_blowfish,
57		"$2"
58	},
59#endif
60	{
61		"nth",
62		crypt_nthash,
63		"$3$"
64	},
65	{
66		NULL,
67		NULL,
68		NULL
69	}
70};
71
72static int crypt_type = -1;
73
74static void
75crypt_setdefault(void)
76{
77	char *def;
78	size_t i;
79
80	if (crypt_type != -1)
81		return;
82	def = auth_getval("crypt_default");
83	if (def == NULL) {
84		crypt_type = 0;
85		return;
86	}
87	for (i = 0; i < sizeof(crypt_types) / sizeof(crypt_types[0]) - 1; i++) {
88		if (strcmp(def, crypt_types[i].name) == 0) {
89			crypt_type = (int)i;
90			return;
91		}
92	}
93	crypt_type = 0;
94}
95
96const char *
97crypt_get_format(void)
98{
99
100	crypt_setdefault();
101	return (crypt_types[crypt_type].name);
102}
103
104int
105crypt_set_format(const char *type)
106{
107	size_t i;
108
109	crypt_setdefault();
110	for (i = 0; i < sizeof(crypt_types) / sizeof(crypt_types[0]) - 1; i++) {
111		if (strcmp(type, crypt_types[i].name) == 0) {
112			crypt_type = (int)i;
113			return (1);
114		}
115	}
116	return (0);
117}
118
119char *
120crypt(const char *passwd, const char *salt)
121{
122	size_t i;
123
124	crypt_setdefault();
125	for (i = 0; i < sizeof(crypt_types) / sizeof(crypt_types[0]) - 1; i++) {
126		if (crypt_types[i].magic != NULL && strncmp(salt,
127		    crypt_types[i].magic, strlen(crypt_types[i].magic)) == 0)
128			return (crypt_types[i].func(passwd, salt));
129	}
130	return (crypt_types[crypt_type].func(passwd, salt));
131}
132