1 /* 2 * Copyright (c) 1997 - 2002 Kungliga Tekniska H�gskolan 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 RCSID("$Id: mk_req_ext.c 19511 2006-12-27 12:07:22Z lha $"); 37 38 krb5_error_code 39 _krb5_mk_req_internal(krb5_context context, 40 krb5_auth_context *auth_context, 41 const krb5_flags ap_req_options, 42 krb5_data *in_data, 43 krb5_creds *in_creds, 44 krb5_data *outbuf, 45 krb5_key_usage checksum_usage, 46 krb5_key_usage encrypt_usage) 47 { 48 krb5_error_code ret; 49 krb5_data authenticator; 50 Checksum c; 51 Checksum *c_opt; 52 krb5_auth_context ac; 53 54 if(auth_context) { 55 if(*auth_context == NULL) 56 ret = krb5_auth_con_init(context, auth_context); 57 else 58 ret = 0; 59 ac = *auth_context; 60 } else 61 ret = krb5_auth_con_init(context, &ac); 62 if(ret) 63 return ret; 64 65 if(ac->local_subkey == NULL && (ap_req_options & AP_OPTS_USE_SUBKEY)) { 66 ret = krb5_auth_con_generatelocalsubkey(context, 67 ac, 68 &in_creds->session); 69 if(ret) 70 goto out; 71 } 72 73 krb5_free_keyblock(context, ac->keyblock); 74 ret = krb5_copy_keyblock(context, &in_creds->session, &ac->keyblock); 75 if (ret) 76 goto out; 77 78 /* it's unclear what type of checksum we can use. try the best one, except: 79 * a) if it's configured differently for the current realm, or 80 * b) if the session key is des-cbc-crc 81 */ 82 83 if (in_data) { 84 if(ac->keyblock->keytype == ETYPE_DES_CBC_CRC) { 85 /* this is to make DCE secd (and older MIT kdcs?) happy */ 86 ret = krb5_create_checksum(context, 87 NULL, 88 0, 89 CKSUMTYPE_RSA_MD4, 90 in_data->data, 91 in_data->length, 92 &c); 93 } else if(ac->keyblock->keytype == ETYPE_ARCFOUR_HMAC_MD5 || 94 ac->keyblock->keytype == ETYPE_ARCFOUR_HMAC_MD5_56 || 95 ac->keyblock->keytype == ETYPE_DES_CBC_MD4 || 96 ac->keyblock->keytype == ETYPE_DES_CBC_MD5) { 97 /* this is to make MS kdc happy */ 98 ret = krb5_create_checksum(context, 99 NULL, 100 0, 101 CKSUMTYPE_RSA_MD5, 102 in_data->data, 103 in_data->length, 104 &c); 105 } else { 106 krb5_crypto crypto; 107 108 ret = krb5_crypto_init(context, ac->keyblock, 0, &crypto); 109 if (ret) 110 goto out; 111 ret = krb5_create_checksum(context, 112 crypto, 113 checksum_usage, 114 0, 115 in_data->data, 116 in_data->length, 117 &c); 118 krb5_crypto_destroy(context, crypto); 119 } 120 c_opt = &c; 121 } else { 122 c_opt = NULL; 123 } 124 125 if (ret) 126 goto out; 127 128 ret = krb5_build_authenticator (context, 129 ac, 130 ac->keyblock->keytype, 131 in_creds, 132 c_opt, 133 NULL, 134 &authenticator, 135 encrypt_usage); 136 if (c_opt) 137 free_Checksum (c_opt); 138 if (ret) 139 goto out; 140 141 ret = krb5_build_ap_req (context, ac->keyblock->keytype, 142 in_creds, ap_req_options, authenticator, outbuf); 143 out: 144 if(auth_context == NULL) 145 krb5_auth_con_free(context, ac); 146 return ret; 147 } 148 149 krb5_error_code KRB5_LIB_FUNCTION 150 krb5_mk_req_extended(krb5_context context, 151 krb5_auth_context *auth_context, 152 const krb5_flags ap_req_options, 153 krb5_data *in_data, 154 krb5_creds *in_creds, 155 krb5_data *outbuf) 156 { 157 return _krb5_mk_req_internal (context, 158 auth_context, 159 ap_req_options, 160 in_data, 161 in_creds, 162 outbuf, 163 KRB5_KU_AP_REQ_AUTH_CKSUM, 164 KRB5_KU_AP_REQ_AUTH); 165 } 166