1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1999 Mark Murray 5 * Copyright (c) 2014 Dag-Erling Smørgrav 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 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 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 * THIS SOFTWARE IS PROVIDED BY MARK MURRAY AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL MARK MURRAY OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/types.h> 34 35 #include <libutil.h> 36 #include <string.h> 37 #include <unistd.h> 38 39 #include "crypt.h" 40 41 /* 42 * List of supported crypt(3) formats. 43 * 44 * The default algorithm is the last entry in the list (second-to-last 45 * array element since the last is a sentinel). The reason for placing 46 * the default last rather than first is that DES needs to be at the 47 * bottom for the algorithm guessing logic in crypt(3) to work correctly, 48 * and it needs to be the default for backward compatibility. 49 */ 50 static const struct crypt_format { 51 const char *name; 52 int (*func)(const char *, const char *, char *); 53 const char *magic; 54 } crypt_formats[] = { 55 { "md5", crypt_md5, "$1$" }, 56 #ifdef HAS_BLOWFISH 57 { "blf", crypt_blowfish, "$2" }, 58 #endif 59 { "nth", crypt_nthash, "$3$" }, 60 { "sha256", crypt_sha256, "$5$" }, 61 { "sha512", crypt_sha512, "$6$" }, 62 #ifdef HAS_DES 63 { "des", crypt_des, "_" }, 64 #endif 65 66 /* sentinel */ 67 { NULL, NULL, NULL } 68 }; 69 70 static const struct crypt_format *crypt_format = 71 &crypt_formats[(sizeof crypt_formats / sizeof *crypt_formats) - 2]; 72 73 #define DES_SALT_ALPHABET \ 74 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" 75 76 /* 77 * Returns the name of the currently selected format. 78 */ 79 const char * 80 crypt_get_format(void) 81 { 82 83 return (crypt_format->name); 84 } 85 86 /* 87 * Selects the format to use for subsequent crypt(3) invocations. 88 */ 89 int 90 crypt_set_format(const char *format) 91 { 92 const struct crypt_format *cf; 93 94 for (cf = crypt_formats; cf->name != NULL; ++cf) { 95 if (strcasecmp(cf->name, format) == 0) { 96 crypt_format = cf; 97 return (1); 98 } 99 } 100 return (0); 101 } 102 103 /* 104 * Hash the given password with the given salt. If the salt begins with a 105 * magic string (e.g. "$6$" for sha512), the corresponding format is used; 106 * otherwise, the currently selected format is used. 107 */ 108 char * 109 crypt_r(const char *passwd, const char *salt, struct crypt_data *data) 110 { 111 const struct crypt_format *cf; 112 int (*func)(const char *, const char *, char *); 113 #ifdef HAS_DES 114 int len; 115 #endif 116 117 for (cf = crypt_formats; cf->name != NULL; ++cf) 118 if (cf->magic != NULL && strstr(salt, cf->magic) == salt) { 119 func = cf->func; 120 goto match; 121 } 122 #ifdef HAS_DES 123 len = strlen(salt); 124 if ((len == 13 || len == 2) && strspn(salt, DES_SALT_ALPHABET) == len) { 125 func = crypt_des; 126 goto match; 127 } 128 #endif 129 func = crypt_format->func; 130 match: 131 if (func(passwd, salt, data->__buf) != 0) 132 return (NULL); 133 return (data->__buf); 134 } 135 136 char * 137 crypt(const char *passwd, const char *salt) 138 { 139 static struct crypt_data data; 140 141 return (crypt_r(passwd, salt, &data)); 142 } 143