1 /* 2 * Copyright (c) 1997 - 2002 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 krb5_error_code 37 _krb5_mk_req_internal(krb5_context context, 38 krb5_auth_context *auth_context, 39 const krb5_flags ap_req_options, 40 krb5_data *in_data, 41 krb5_creds *in_creds, 42 krb5_data *outbuf, 43 krb5_key_usage checksum_usage, 44 krb5_key_usage encrypt_usage) 45 { 46 krb5_error_code ret; 47 krb5_data authenticator; 48 Checksum c; 49 Checksum *c_opt; 50 krb5_auth_context ac; 51 52 if(auth_context) { 53 if(*auth_context == NULL) 54 ret = krb5_auth_con_init(context, auth_context); 55 else 56 ret = 0; 57 ac = *auth_context; 58 } else 59 ret = krb5_auth_con_init(context, &ac); 60 if(ret) 61 return ret; 62 63 if(ac->local_subkey == NULL && (ap_req_options & AP_OPTS_USE_SUBKEY)) { 64 ret = krb5_auth_con_generatelocalsubkey(context, 65 ac, 66 &in_creds->session); 67 if(ret) 68 goto out; 69 } 70 71 krb5_free_keyblock(context, ac->keyblock); 72 ret = krb5_copy_keyblock(context, &in_creds->session, &ac->keyblock); 73 if (ret) 74 goto out; 75 76 /* it's unclear what type of checksum we can use. try the best one, except: 77 * a) if it's configured differently for the current realm, or 78 * b) if the session key is des-cbc-crc 79 */ 80 81 if (in_data) { 82 if(ac->keyblock->keytype == ETYPE_DES_CBC_CRC) { 83 /* this is to make DCE secd (and older MIT kdcs?) happy */ 84 ret = krb5_create_checksum(context, 85 NULL, 86 0, 87 CKSUMTYPE_RSA_MD4, 88 in_data->data, 89 in_data->length, 90 &c); 91 } else if(ac->keyblock->keytype == ETYPE_ARCFOUR_HMAC_MD5 || 92 ac->keyblock->keytype == ETYPE_ARCFOUR_HMAC_MD5_56 || 93 ac->keyblock->keytype == ETYPE_DES_CBC_MD4 || 94 ac->keyblock->keytype == ETYPE_DES_CBC_MD5) { 95 /* this is to make MS kdc happy */ 96 ret = krb5_create_checksum(context, 97 NULL, 98 0, 99 CKSUMTYPE_RSA_MD5, 100 in_data->data, 101 in_data->length, 102 &c); 103 } else { 104 krb5_crypto crypto; 105 106 ret = krb5_crypto_init(context, ac->keyblock, 0, &crypto); 107 if (ret) 108 goto out; 109 ret = krb5_create_checksum(context, 110 crypto, 111 checksum_usage, 112 0, 113 in_data->data, 114 in_data->length, 115 &c); 116 krb5_crypto_destroy(context, crypto); 117 } 118 c_opt = &c; 119 } else { 120 c_opt = NULL; 121 } 122 123 if (ret) 124 goto out; 125 126 ret = _krb5_build_authenticator(context, 127 ac, 128 ac->keyblock->keytype, 129 in_creds, 130 c_opt, 131 &authenticator, 132 encrypt_usage); 133 if (c_opt) 134 free_Checksum (c_opt); 135 if (ret) 136 goto out; 137 138 ret = krb5_build_ap_req (context, ac->keyblock->keytype, 139 in_creds, ap_req_options, authenticator, outbuf); 140 out: 141 if(auth_context == NULL) 142 krb5_auth_con_free(context, ac); 143 return ret; 144 } 145 146 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 147 krb5_mk_req_extended(krb5_context context, 148 krb5_auth_context *auth_context, 149 const krb5_flags ap_req_options, 150 krb5_data *in_data, 151 krb5_creds *in_creds, 152 krb5_data *outbuf) 153 { 154 return _krb5_mk_req_internal (context, 155 auth_context, 156 ap_req_options, 157 in_data, 158 in_creds, 159 outbuf, 160 KRB5_KU_AP_REQ_AUTH_CKSUM, 161 KRB5_KU_AP_REQ_AUTH); 162 } 163