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,v 1.26.4.1 2003/09/18 20:34:30 lha Exp $"); 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, ac, &in_creds->session); 67 if(ret) 68 return ret; 69 } 70 71 #if 0 72 { 73 /* This is somewhat bogus since we're possibly overwriting a 74 value specified by the user, but it's the easiest way to make 75 the code use a compatible enctype */ 76 Ticket ticket; 77 krb5_keytype ticket_keytype; 78 79 ret = decode_Ticket(in_creds->ticket.data, 80 in_creds->ticket.length, 81 &ticket, 82 NULL); 83 krb5_enctype_to_keytype (context, 84 ticket.enc_part.etype, 85 &ticket_keytype); 86 87 if (ticket_keytype == in_creds->session.keytype) 88 krb5_auth_setenctype(context, 89 ac, 90 ticket.enc_part.etype); 91 free_Ticket(&ticket); 92 } 93 #endif 94 95 krb5_free_keyblock(context, ac->keyblock); 96 krb5_copy_keyblock(context, &in_creds->session, &ac->keyblock); 97 98 /* it's unclear what type of checksum we can use. try the best one, except: 99 * a) if it's configured differently for the current realm, or 100 * b) if the session key is des-cbc-crc 101 */ 102 103 if (in_data) { 104 if(ac->keyblock->keytype == ETYPE_DES_CBC_CRC) { 105 /* this is to make DCE secd (and older MIT kdcs?) happy */ 106 ret = krb5_create_checksum(context, 107 NULL, 108 0, 109 CKSUMTYPE_RSA_MD4, 110 in_data->data, 111 in_data->length, 112 &c); 113 } else if(ac->keyblock->keytype == ETYPE_ARCFOUR_HMAC_MD5) { 114 /* this is to make MS kdc happy */ 115 ret = krb5_create_checksum(context, 116 NULL, 117 0, 118 CKSUMTYPE_RSA_MD5, 119 in_data->data, 120 in_data->length, 121 &c); 122 } else { 123 krb5_crypto crypto; 124 125 ret = krb5_crypto_init(context, ac->keyblock, 0, &crypto); 126 if (ret) 127 return ret; 128 ret = krb5_create_checksum(context, 129 crypto, 130 checksum_usage, 131 0, 132 in_data->data, 133 in_data->length, 134 &c); 135 136 krb5_crypto_destroy(context, crypto); 137 } 138 c_opt = &c; 139 } else { 140 c_opt = NULL; 141 } 142 143 ret = krb5_build_authenticator (context, 144 ac, 145 ac->keyblock->keytype, 146 in_creds, 147 c_opt, 148 NULL, 149 &authenticator, 150 encrypt_usage); 151 if (c_opt) 152 free_Checksum (c_opt); 153 if (ret) 154 return ret; 155 156 ret = krb5_build_ap_req (context, ac->keyblock->keytype, 157 in_creds, ap_req_options, authenticator, outbuf); 158 if(auth_context == NULL) 159 krb5_auth_con_free(context, ac); 160 return ret; 161 } 162 163 krb5_error_code 164 krb5_mk_req_extended(krb5_context context, 165 krb5_auth_context *auth_context, 166 const krb5_flags ap_req_options, 167 krb5_data *in_data, 168 krb5_creds *in_creds, 169 krb5_data *outbuf) 170 { 171 return krb5_mk_req_internal (context, 172 auth_context, 173 ap_req_options, 174 in_data, 175 in_creds, 176 outbuf, 177 KRB5_KU_AP_REQ_AUTH_CKSUM, 178 KRB5_KU_AP_REQ_AUTH); 179 } 180