1 /* 2 * Copyright (c) 1997 - 2000 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 1.24 2000/11/15 07:01:26 assar 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 0 66 { 67 /* This is somewhat bogus since we're possibly overwriting a 68 value specified by the user, but it's the easiest way to make 69 the code use a compatible enctype */ 70 Ticket ticket; 71 krb5_keytype ticket_keytype; 72 73 ret = decode_Ticket(in_creds->ticket.data, 74 in_creds->ticket.length, 75 &ticket, 76 NULL); 77 krb5_enctype_to_keytype (context, 78 ticket.enc_part.etype, 79 &ticket_keytype); 80 81 if (ticket_keytype == in_creds->session.keytype) 82 krb5_auth_setenctype(context, 83 ac, 84 ticket.enc_part.etype); 85 free_Ticket(&ticket); 86 } 87 #endif 88 89 krb5_free_keyblock(context, ac->keyblock); 90 krb5_copy_keyblock(context, &in_creds->session, &ac->keyblock); 91 92 /* it's unclear what type of checksum we can use. try the best one, except: 93 * a) if it's configured differently for the current realm, or 94 * b) if the session key is des-cbc-crc 95 */ 96 97 if (in_data) { 98 if(ac->keyblock->keytype == ETYPE_DES_CBC_CRC) { 99 /* this is to make DCE secd (and older MIT kdcs?) happy */ 100 ret = krb5_create_checksum(context, 101 NULL, 102 CKSUMTYPE_RSA_MD4, 103 in_data->data, 104 in_data->length, 105 &c); 106 } else { 107 krb5_crypto crypto; 108 109 ret = krb5_crypto_init(context, ac->keyblock, 0, &crypto); 110 if (ret) 111 return ret; 112 ret = krb5_create_checksum(context, 113 crypto, 114 checksum_usage, 115 in_data->data, 116 in_data->length, 117 &c); 118 119 krb5_crypto_destroy(context, crypto); 120 } 121 c_opt = &c; 122 } else { 123 c_opt = NULL; 124 } 125 126 ret = krb5_build_authenticator (context, 127 ac, 128 ac->keyblock->keytype, 129 in_creds, 130 c_opt, 131 NULL, 132 &authenticator, 133 encrypt_usage); 134 if (c_opt) 135 free_Checksum (c_opt); 136 if (ret) 137 return ret; 138 139 ret = krb5_build_ap_req (context, ac->keyblock->keytype, 140 in_creds, ap_req_options, authenticator, outbuf); 141 if(auth_context == NULL) 142 krb5_auth_con_free(context, ac); 143 return ret; 144 } 145 146 krb5_error_code 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