1/* 2 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 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 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#include "krb5_locl.h" 35 36#ifdef HEIM_KRB5_ARCFOUR 37 38int krb5_heim_use_broken_arcfour_string2key = 0; 39 40static krb5_error_code 41ARCFOUR_string_to_key_broken(krb5_context context, 42 krb5_enctype enctype, 43 krb5_data password, 44 krb5_salt salt, 45 krb5_data opaque, 46 krb5_keyblock *key) 47{ 48 krb5_error_code ret; 49 size_t i; 50 CCDigestRef m; 51 52 m = CCDigestCreate(kCCDigestMD4); 53 if (m == NULL) { 54 ret = ENOMEM; 55 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 56 goto out; 57 } 58 59 /* LE encoding */ 60 for (i = 0; i < password.length; i++) { 61 unsigned char p; 62 63 p = ((const uint8_t *)password.data)[i] & 0xff; 64 CCDigestUpdate(m, &p, 1); 65 p = 0; 66 CCDigestUpdate(m, &p, 1); 67 } 68 69 key->keytype = enctype; 70 ret = krb5_data_alloc (&key->keyvalue, 16); 71 if (ret) { 72 krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", "")); 73 goto out; 74 } 75 CCDigestFinal(m, key->keyvalue.data); 76 77 out: 78 CCDigestDestroy(m); 79 return ret; 80} 81 82static krb5_error_code 83ARCFOUR_string_to_key(krb5_context context, 84 krb5_enctype enctype, 85 krb5_data password, 86 krb5_salt salt, 87 krb5_data opaque, 88 krb5_keyblock *key) 89{ 90 krb5_error_code ret; 91 uint16_t *s = NULL; 92 size_t len, i; 93 CCDigestRef m; 94 95 if (getenv("KRB5_USE_BROKEN_ARCFOUR_STRING2KEY") || krb5_heim_use_broken_arcfour_string2key) 96 return ARCFOUR_string_to_key_broken(context, enctype, password, 97 salt, opaque, key); 98 99 m = CCDigestCreate(kCCDigestMD4); 100 if (m == NULL) { 101 ret = ENOMEM; 102 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 103 goto out; 104 } 105 106 ret = wind_utf8ucs2_length(password.data, &len); 107 if (ret) { 108 krb5_set_error_message (context, ret, 109 N_("Password not an UCS2 string", "")); 110 goto out; 111 } 112 113 s = malloc (len * sizeof(s[0])); 114 if (len != 0 && s == NULL) { 115 krb5_set_error_message (context, ENOMEM, 116 N_("malloc: out of memory", "")); 117 ret = ENOMEM; 118 goto out; 119 } 120 121 ret = wind_utf8ucs2(password.data, s, &len); 122 if (ret) { 123 krb5_set_error_message (context, ret, 124 N_("Password not an UCS2 string", "")); 125 goto out; 126 } 127 128 /* LE encoding */ 129 for (i = 0; i < len; i++) { 130 unsigned char p; 131 p = (s[i] & 0xff); 132 CCDigestUpdate(m, &p, 1); 133 p = (s[i] >> 8) & 0xff; 134 CCDigestUpdate(m, &p, 1); 135 } 136 137 key->keytype = enctype; 138 ret = krb5_data_alloc (&key->keyvalue, 16); 139 if (ret) { 140 krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", "")); 141 goto out; 142 } 143 CCDigestFinal(m, key->keyvalue.data); 144 145 out: 146 CCDigestDestroy(m); 147 if (s) 148 memset (s, 0, len); 149 free (s); 150 return ret; 151} 152 153struct salt_type _krb5_arcfour_salt[] = { 154 { 155 KRB5_PW_SALT, 156 "pw-salt", 157 ARCFOUR_string_to_key 158 }, 159 { 0 } 160}; 161 162#endif /* HEIM_KRB5_ARCFOUR */ 163