1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 #include <sys/types.h> 32 33 #include <string.h> 34 #include <unistd.h> 35 36 #include "crypt.h" 37 38 /* 39 * List of supported crypt(3) formats. 40 * 41 * The default algorithm is the last entry in the list (second-to-last 42 * array element since the last is a sentinel). The reason for placing 43 * the default last rather than first is that DES needs to be at the 44 * bottom for the algorithm guessing logic in crypt(3) to work correctly, 45 * and it needs to be the default for backward compatibility. 46 */ 47 static const struct crypt_format { 48 const char *name; 49 int (*func)(const char *, const char *, char *); 50 const char *magic; 51 } crypt_formats[] = { 52 { "md5", crypt_md5, "$1$" }, 53 #ifdef HAS_BLOWFISH 54 { "blf", crypt_blowfish, "$2" }, 55 #endif 56 { "nth", crypt_nthash, "$3$" }, 57 { "sha256", crypt_sha256, "$5$" }, 58 { "sha512", crypt_sha512, "$6$" }, 59 #ifdef HAS_DES 60 { "des", crypt_des, "_" }, 61 #endif 62 63 /* sentinel */ 64 { NULL, NULL, NULL } 65 }; 66 67 static const struct crypt_format *crypt_format = 68 &crypt_formats[(sizeof crypt_formats / sizeof *crypt_formats) - 2]; 69 70 #define DES_SALT_ALPHABET \ 71 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" 72 73 /* 74 * Returns the name of the currently selected format. 75 */ 76 const char * 77 crypt_get_format(void) 78 { 79 80 return (crypt_format->name); 81 } 82 83 /* 84 * Selects the format to use for subsequent crypt(3) invocations. 85 */ 86 int 87 crypt_set_format(const char *format) 88 { 89 const struct crypt_format *cf; 90 91 for (cf = crypt_formats; cf->name != NULL; ++cf) { 92 if (strcasecmp(cf->name, format) == 0) { 93 crypt_format = cf; 94 return (1); 95 } 96 } 97 return (0); 98 } 99 100 /* 101 * Hash the given password with the given salt. If the salt begins with a 102 * magic string (e.g. "$6$" for sha512), the corresponding format is used; 103 * otherwise, the currently selected format is used. 104 */ 105 char * 106 crypt_r(const char *passwd, const char *salt, struct crypt_data *data) 107 { 108 const struct crypt_format *cf; 109 int (*func)(const char *, const char *, char *); 110 #ifdef HAS_DES 111 int len; 112 #endif 113 114 for (cf = crypt_formats; cf->name != NULL; ++cf) 115 if (cf->magic != NULL && strstr(salt, cf->magic) == salt) { 116 func = cf->func; 117 goto match; 118 } 119 #ifdef HAS_DES 120 len = strlen(salt); 121 if ((len == 13 || len == 2) && strspn(salt, DES_SALT_ALPHABET) == len) { 122 func = crypt_des; 123 goto match; 124 } 125 #endif 126 func = crypt_format->func; 127 match: 128 if (func(passwd, salt, data->__buf) != 0) 129 return (NULL); 130 return (data->__buf); 131 } 132 133 char * 134 crypt(const char *passwd, const char *salt) 135 { 136 static struct crypt_data data; 137 138 return (crypt_r(passwd, salt, &data)); 139 } 140