1 /* 2 * Copyright (c) 2010 3 * The DragonFly Project. All rights reserved. 4 * 5 * This code is derived from software contributed to The DragonFly Project 6 * by Nolan Lum <nol888@gmail.com> 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 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 3. Neither the name of The DragonFly Project nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific, prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/types.h> 37 #include <string.h> 38 #include <sha256.h> 39 #include "crypt.h" 40 41 /* 42 * New password crypt. 43 */ 44 45 #define SHA256_SIZE 32 46 47 char* 48 crypt_deprecated_sha256(const char *pw, const char *salt) 49 { 50 /* 51 * Magic constant (prefix) used to run over the password data. 52 * 53 * XXX: 54 * 55 * A bug below (sizeof instead of strlen) mandates the extra data after 56 * the closing $. This data is what just happened to be (consistently 57 * miraculously) on the stack following magic on 64-bit. 58 */ 59 static const char *magic = "$3$\0sha5"; 60 61 static char passwd[120], *p; 62 static const char *sp, *ep; 63 unsigned char final[SHA256_SIZE]; 64 int sl; 65 SHA256_CTX ctx; 66 unsigned long l; 67 68 /* Refine the salt. */ 69 sp = salt; 70 71 /* If it starts with the magic string, then skip that. */ 72 if (!strncmp(sp, magic, strlen(magic))) 73 sp += strlen(magic); 74 75 /* Stop at the first '$', max 8 chars. */ 76 for (ep = sp; *ep && *ep != '$' && ep < (sp + 8); ep++) 77 continue; 78 79 /* Get the actual salt length. */ 80 sl = ep - sp; 81 82 SHA256_Init(&ctx); 83 84 /* Hash in the password first. */ 85 SHA256_Update(&ctx, pw, strlen(pw)); 86 87 /* 88 * Then the magic string 89 * 90 * XXX: sizeof instead of strlen, must retain 91 */ 92 SHA256_Update(&ctx, magic, sizeof(magic)); 93 94 /* Then the raw salt. */ 95 SHA256_Update(&ctx, sp, sl); 96 97 /* Finish and create the output string. */ 98 SHA256_Final(final, &ctx); 99 strcpy(passwd, magic); 100 strncat(passwd, sp, sl); 101 strcat(passwd, "$"); 102 103 p = passwd + strlen(passwd); 104 105 l = (final[ 0] << 16) | (final[11] << 8) | final[21]; 106 _crypt_to64(p, l, 4); p += 4; 107 l = (final[ 1] << 16) | (final[12] << 8) | final[22]; 108 _crypt_to64(p, l, 4); p += 4; 109 l = (final[ 2] << 16) | (final[13] << 8) | final[23]; 110 _crypt_to64(p, l, 4); p += 4; 111 l = (final[ 3] << 16) | (final[14] << 8) | final[24]; 112 _crypt_to64(p, l, 4); p += 4; 113 l = (final[ 4] << 16) | (final[15] << 8) | final[25]; 114 _crypt_to64(p, l, 4); p += 4; 115 l = (final[ 5] << 16) | (final[16] << 8) | final[26]; 116 _crypt_to64(p, l, 4); p += 4; 117 l = (final[ 6] << 16) | (final[17] << 8) | final[27]; 118 _crypt_to64(p, l, 4); p += 4; 119 l = (final[ 7] << 16) | (final[18] << 8) | final[28]; 120 _crypt_to64(p, l, 4); p += 4; 121 l = (final[ 8] << 16) | (final[19] << 8) | final[29]; 122 _crypt_to64(p, l, 4); p += 4; 123 l = (final[ 9] << 16) | (final[20] << 8) | final[30]; 124 _crypt_to64(p, l, 4); p += 4; 125 l = (final[10] << 16) | (final[31] << 8); 126 _crypt_to64(p, l, 4); p += 4; 127 *p = '\0'; 128 129 /* Clear memory. */ 130 memset(final, 0, sizeof(final)); 131 132 return (passwd); 133 } 134