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 36krb5_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_ccache ccache, 42 krb5_creds *in_creds, 43 krb5_data *outbuf, 44 krb5_key_usage checksum_usage, 45 krb5_key_usage encrypt_usage) 46{ 47 krb5_error_code ret; 48 krb5_data authenticator; 49 Checksum c; 50 Checksum *c_opt; 51 krb5_auth_context ac; 52 53 if(auth_context) { 54 if(*auth_context == NULL) 55 ret = krb5_auth_con_init(context, auth_context); 56 else 57 ret = 0; 58 ac = *auth_context; 59 } else 60 ret = krb5_auth_con_init(context, &ac); 61 if(ret) 62 return ret; 63 64 if(ac->local_subkey == NULL && (ap_req_options & AP_OPTS_USE_SUBKEY)) { 65 ret = krb5_auth_con_generatelocalsubkey(context, 66 ac, 67 &in_creds->session); 68 if(ret) 69 goto out; 70 } 71 72 krb5_free_keyblock(context, ac->keyblock); 73 ret = krb5_copy_keyblock(context, &in_creds->session, &ac->keyblock); 74 if (ret) 75 goto out; 76 77 /* it's unclear what type of checksum we can use. try the best one, except: 78 * a) if it's configured differently for the current realm, or 79 * b) if the session key is des-cbc-crc 80 */ 81 82 if (in_data) { 83 if(ac->keyblock->keytype == ETYPE_DES_CBC_CRC) { 84 /* this is to make DCE secd (and older MIT kdcs?) happy */ 85 ret = krb5_create_checksum(context, 86 NULL, 87 0, 88 CKSUMTYPE_RSA_MD4, 89 in_data->data, 90 in_data->length, 91 &c); 92 } else if(ac->keyblock->keytype == ETYPE_ARCFOUR_HMAC_MD5 || 93 ac->keyblock->keytype == ETYPE_ARCFOUR_HMAC_MD5_56 || 94 ac->keyblock->keytype == ETYPE_DES_CBC_MD4 || 95 ac->keyblock->keytype == ETYPE_DES_CBC_MD5) { 96 /* this is to make MS kdc happy */ 97 ret = krb5_create_checksum(context, 98 NULL, 99 0, 100 CKSUMTYPE_RSA_MD5, 101 in_data->data, 102 in_data->length, 103 &c); 104 } else { 105 krb5_crypto crypto; 106 107 ret = krb5_crypto_init(context, ac->keyblock, 0, &crypto); 108 if (ret) 109 goto out; 110 ret = krb5_create_checksum(context, 111 crypto, 112 checksum_usage, 113 0, 114 in_data->data, 115 in_data->length, 116 &c); 117 krb5_crypto_destroy(context, crypto); 118 } 119 c_opt = &c; 120 } else { 121 c_opt = NULL; 122 } 123 124 if (ret) 125 goto out; 126 127 ret = _krb5_build_authenticator(context, 128 ac, 129 ac->keyblock->keytype, 130 in_creds, 131 c_opt, 132 &authenticator, 133 encrypt_usage); 134 if (c_opt) 135 free_Checksum (c_opt); 136 if (ret) 137 goto out; 138 139 ret = krb5_build_ap_req (context, ac->keyblock->keytype, 140 in_creds, ap_req_options, authenticator, outbuf); 141out: 142 if(auth_context == NULL) 143 krb5_auth_con_free(context, ac); 144 return ret; 145} 146 147KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 148krb5_mk_req_extended(krb5_context context, 149 krb5_auth_context *auth_context, 150 const krb5_flags ap_req_options, 151 krb5_data *in_data, 152 krb5_creds *in_creds, 153 krb5_data *outbuf) 154{ 155 return _krb5_mk_req_internal(context, 156 auth_context, 157 ap_req_options, 158 in_data, 159 NULL, 160 in_creds, 161 outbuf, 162 KRB5_KU_AP_REQ_AUTH_CKSUM, 163 KRB5_KU_AP_REQ_AUTH); 164} 165