xref: /freebsd/lib/libcrypt/crypt.c (revision 42c159fe388a3765f69860c84183700af37aca8a)
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("$FreeBSD$");
29 
30 #include <sys/types.h>
31 #include <string.h>
32 #include <libutil.h>
33 #include <unistd.h>
34 #include "crypt.h"
35 
36 static 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 		NULL,
62 		NULL,
63 		NULL
64 	}
65 };
66 
67 static int crypt_type = -1;
68 
69 static void
70 crypt_setdefault(void)
71 {
72 	char *def;
73 	size_t i;
74 
75 	if (crypt_type != -1)
76 		return;
77 	def = auth_getval("crypt_default");
78 	if (def == NULL) {
79 		crypt_type = 0;
80 		return;
81 	}
82 	for (i = 0; i < sizeof(crypt_types) / sizeof(crypt_types[0]) - 1; i++) {
83 		if (strcmp(def, crypt_types[i].name) == 0) {
84 			crypt_type = (int)i;
85 			return;
86 		}
87 	}
88 	crypt_type = 0;
89 }
90 
91 const char *
92 crypt_get_format(void)
93 {
94 
95 	crypt_setdefault();
96 	return (crypt_types[crypt_type].name);
97 }
98 
99 int
100 crypt_set_format(const char *type)
101 {
102 	size_t i;
103 
104 	crypt_setdefault();
105 	for (i = 0; i < sizeof(crypt_types) / sizeof(crypt_types[0]) - 1; i++) {
106 		if (strcmp(type, crypt_types[i].name) == 0) {
107 			crypt_type = (int)i;
108 			return (1);
109 		}
110 	}
111 	return (0);
112 }
113 
114 char *
115 crypt(const char *passwd, const char *salt)
116 {
117 	size_t i;
118 
119 	crypt_setdefault();
120 	for (i = 0; i < sizeof(crypt_types) / sizeof(crypt_types[0]) - 1; i++) {
121 		if (crypt_types[i].magic != NULL && strncmp(salt,
122 		    crypt_types[i].magic, strlen(crypt_types[i].magic)) == 0)
123 			return (crypt_types[i].func(passwd, salt));
124 	}
125 	return (crypt_types[crypt_type].func(passwd, salt));
126 }
127