1 /* $NetBSD: rd_rep.c,v 1.1.1.2 2014/04/24 12:45:51 pettai Exp $ */ 2 3 /* 4 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include "krb5_locl.h" 37 38 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 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 52 ret = decode_AP_REP(inbuf->data, inbuf->length, &ap_rep, &len); 53 if (ret) 54 return ret; 55 if (ap_rep.pvno != 5) { 56 ret = KRB5KRB_AP_ERR_BADVERSION; 57 krb5_clear_error_message (context); 58 goto out; 59 } 60 if (ap_rep.msg_type != krb_ap_rep) { 61 ret = KRB5KRB_AP_ERR_MSG_TYPE; 62 krb5_clear_error_message (context); 63 goto out; 64 } 65 66 ret = krb5_crypto_init(context, auth_context->keyblock, 0, &crypto); 67 if (ret) 68 goto out; 69 ret = krb5_decrypt_EncryptedData (context, 70 crypto, 71 KRB5_KU_AP_REQ_ENC_PART, 72 &ap_rep.enc_part, 73 &data); 74 krb5_crypto_destroy(context, crypto); 75 if (ret) 76 goto out; 77 78 *repl = malloc(sizeof(**repl)); 79 if (*repl == NULL) { 80 ret = ENOMEM; 81 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 82 goto out; 83 } 84 ret = decode_EncAPRepPart(data.data, data.length, *repl, &len); 85 if (ret) { 86 krb5_set_error_message(context, ret, N_("Failed to decode EncAPRepPart", "")); 87 return ret; 88 } 89 90 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) { 91 if ((*repl)->ctime != auth_context->authenticator->ctime || 92 (*repl)->cusec != auth_context->authenticator->cusec) 93 { 94 krb5_free_ap_rep_enc_part(context, *repl); 95 *repl = NULL; 96 ret = KRB5KRB_AP_ERR_MUT_FAIL; 97 krb5_clear_error_message (context); 98 goto out; 99 } 100 } 101 if ((*repl)->seq_number) 102 krb5_auth_con_setremoteseqnumber(context, auth_context, 103 *((*repl)->seq_number)); 104 if ((*repl)->subkey) 105 krb5_auth_con_setremotesubkey(context, auth_context, (*repl)->subkey); 106 107 out: 108 krb5_data_free (&data); 109 free_AP_REP (&ap_rep); 110 return ret; 111 } 112 113 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 114 krb5_free_ap_rep_enc_part (krb5_context context, 115 krb5_ap_rep_enc_part *val) 116 { 117 if (val) { 118 free_EncAPRepPart (val); 119 free (val); 120 } 121 } 122