1 /* 2 * Copyright (c) 1997 - 2001 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 36 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 37 krb5_rd_rep(krb5_context context, 38 krb5_auth_context auth_context, 39 const krb5_data *inbuf, 40 krb5_ap_rep_enc_part **repl) 41 { 42 krb5_error_code ret; 43 AP_REP ap_rep; 44 size_t len; 45 krb5_data data; 46 krb5_crypto crypto; 47 48 krb5_data_zero (&data); 49 50 ret = decode_AP_REP(inbuf->data, inbuf->length, &ap_rep, &len); 51 if (ret) 52 return ret; 53 if (ap_rep.pvno != 5) { 54 ret = KRB5KRB_AP_ERR_BADVERSION; 55 krb5_clear_error_message (context); 56 goto out; 57 } 58 if (ap_rep.msg_type != krb_ap_rep) { 59 ret = KRB5KRB_AP_ERR_MSG_TYPE; 60 krb5_clear_error_message (context); 61 goto out; 62 } 63 64 ret = krb5_crypto_init(context, auth_context->keyblock, 0, &crypto); 65 if (ret) 66 goto out; 67 ret = krb5_decrypt_EncryptedData (context, 68 crypto, 69 KRB5_KU_AP_REQ_ENC_PART, 70 &ap_rep.enc_part, 71 &data); 72 krb5_crypto_destroy(context, crypto); 73 if (ret) 74 goto out; 75 76 *repl = malloc(sizeof(**repl)); 77 if (*repl == NULL) { 78 ret = ENOMEM; 79 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 80 goto out; 81 } 82 ret = decode_EncAPRepPart(data.data, data.length, *repl, &len); 83 if (ret) { 84 krb5_set_error_message(context, ret, N_("Failed to decode EncAPRepPart", "")); 85 return ret; 86 } 87 88 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) { 89 if ((*repl)->ctime != auth_context->authenticator->ctime || 90 (*repl)->cusec != auth_context->authenticator->cusec) 91 { 92 krb5_free_ap_rep_enc_part(context, *repl); 93 *repl = NULL; 94 ret = KRB5KRB_AP_ERR_MUT_FAIL; 95 krb5_clear_error_message (context); 96 goto out; 97 } 98 } 99 if ((*repl)->seq_number) 100 krb5_auth_con_setremoteseqnumber(context, auth_context, 101 *((*repl)->seq_number)); 102 if ((*repl)->subkey) 103 krb5_auth_con_setremotesubkey(context, auth_context, (*repl)->subkey); 104 105 out: 106 krb5_data_free (&data); 107 free_AP_REP (&ap_rep); 108 return ret; 109 } 110 111 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 112 krb5_free_ap_rep_enc_part (krb5_context context, 113 krb5_ap_rep_enc_part *val) 114 { 115 if (val) { 116 free_EncAPRepPart (val); 117 free (val); 118 } 119 } 120