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 <string.h> 36 #include <unistd.h> 37 38 #include "crypt.h" 39 40 /* 41 * List of supported crypt(3) formats. 42 * 43 * The default algorithm is the last entry in the list (second-to-last 44 * array element since the last is a sentinel). The reason for placing 45 * the default last rather than first is that DES needs to be at the 46 * bottom for the algorithm guessing logic in crypt(3) to work correctly, 47 * and it needs to be the default for backward compatibility. 48 */ 49 static const struct crypt_format { 50 const char *name; 51 int (*func)(const char *, const char *, char *); 52 const char *magic; 53 } crypt_formats[] = { 54 { "md5", crypt_md5, "$1$" }, 55 #ifdef HAS_BLOWFISH 56 { "blf", crypt_blowfish, "$2" }, 57 #endif 58 { "nth", crypt_nthash, "$3$" }, 59 { "sha256", crypt_sha256, "$5$" }, 60 { "sha512", crypt_sha512, "$6$" }, 61 #ifdef HAS_DES 62 { "des", crypt_des, "_" }, 63 #endif 64 65 /* sentinel */ 66 { NULL, NULL, NULL } 67 }; 68 69 static const struct crypt_format *crypt_format = 70 &crypt_formats[(sizeof crypt_formats / sizeof *crypt_formats) - 2]; 71 72 #define DES_SALT_ALPHABET \ 73 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" 74 75 /* 76 * Returns the name of the currently selected format. 77 */ 78 const char * 79 crypt_get_format(void) 80 { 81 82 return (crypt_format->name); 83 } 84 85 /* 86 * Selects the format to use for subsequent crypt(3) invocations. 87 */ 88 int 89 crypt_set_format(const char *format) 90 { 91 const struct crypt_format *cf; 92 93 for (cf = crypt_formats; cf->name != NULL; ++cf) { 94 if (strcasecmp(cf->name, format) == 0) { 95 crypt_format = cf; 96 return (1); 97 } 98 } 99 return (0); 100 } 101 102 /* 103 * Hash the given password with the given salt. If the salt begins with a 104 * magic string (e.g. "$6$" for sha512), the corresponding format is used; 105 * otherwise, the currently selected format is used. 106 */ 107 char * 108 crypt_r(const char *passwd, const char *salt, struct crypt_data *data) 109 { 110 const struct crypt_format *cf; 111 int (*func)(const char *, const char *, char *); 112 #ifdef HAS_DES 113 int len; 114 #endif 115 116 for (cf = crypt_formats; cf->name != NULL; ++cf) 117 if (cf->magic != NULL && strstr(salt, cf->magic) == salt) { 118 func = cf->func; 119 goto match; 120 } 121 #ifdef HAS_DES 122 len = strlen(salt); 123 if ((len == 13 || len == 2) && strspn(salt, DES_SALT_ALPHABET) == len) { 124 func = crypt_des; 125 goto match; 126 } 127 #endif 128 func = crypt_format->func; 129 match: 130 if (func(passwd, salt, data->__buf) != 0) 131 return (NULL); 132 return (data->__buf); 133 } 134 135 char * 136 crypt(const char *passwd, const char *salt) 137 { 138 static struct crypt_data data; 139 140 return (crypt_r(passwd, salt, &data)); 141 } 142