1 /* 2 * Copyright (c) 1997, 1998 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: rd_rep.c,v 1.20 2000/08/18 06:49:03 assar Exp $"); 37 38 krb5_error_code 39 krb5_rd_rep(krb5_context context, 40 krb5_auth_context auth_context, 41 const krb5_data *inbuf, 42 krb5_ap_rep_enc_part **repl) 43 { 44 krb5_error_code ret; 45 AP_REP ap_rep; 46 size_t len; 47 krb5_data data; 48 krb5_crypto crypto; 49 50 krb5_data_zero (&data); 51 ret = 0; 52 53 ret = decode_AP_REP(inbuf->data, inbuf->length, &ap_rep, &len); 54 if (ret) 55 return ret; 56 if (ap_rep.pvno != 5) { 57 ret = KRB5KRB_AP_ERR_BADVERSION; 58 goto out; 59 } 60 if (ap_rep.msg_type != krb_ap_rep) { 61 ret = KRB5KRB_AP_ERR_MSG_TYPE; 62 goto out; 63 } 64 65 ret = krb5_crypto_init(context, auth_context->keyblock, 0, &crypto); 66 if (ret) 67 goto out; 68 ret = krb5_decrypt_EncryptedData (context, 69 crypto, 70 KRB5_KU_AP_REQ_ENC_PART, 71 &ap_rep.enc_part, 72 &data); 73 krb5_crypto_destroy(context, crypto); 74 if (ret) 75 goto out; 76 77 *repl = malloc(sizeof(**repl)); 78 if (*repl == NULL) { 79 ret = ENOMEM; 80 goto out; 81 } 82 ret = krb5_decode_EncAPRepPart(context, 83 data.data, 84 data.length, 85 *repl, 86 &len); 87 if (ret) 88 return ret; 89 90 if ((*repl)->ctime != auth_context->authenticator->ctime || 91 (*repl)->cusec != auth_context->authenticator->cusec) { 92 ret = KRB5KRB_AP_ERR_MUT_FAIL; 93 goto out; 94 } 95 if ((*repl)->seq_number) 96 auth_context->remote_seqnumber = *((*repl)->seq_number); 97 98 out: 99 krb5_data_free (&data); 100 free_AP_REP (&ap_rep); 101 return ret; 102 } 103 104 void 105 krb5_free_ap_rep_enc_part (krb5_context context, 106 krb5_ap_rep_enc_part *val) 107 { 108 free_EncAPRepPart (val); 109 free (val); 110 } 111