1/*	$NetBSD: rd_rep.c,v 1.2 2017/01/28 21:31:49 christos Exp $	*/
2
3/*
4 * Copyright (c) 1997 - 2001 Kungliga Tekniska H��gskolan
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
38KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
39krb5_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    *repl = NULL;
51    krb5_data_zero (&data);
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	krb5_clear_error_message (context);
59	goto out;
60    }
61    if (ap_rep.msg_type != krb_ap_rep) {
62	ret = KRB5KRB_AP_ERR_MSG_TYPE;
63	krb5_clear_error_message (context);
64	goto out;
65    }
66
67    ret = krb5_crypto_init(context, auth_context->keyblock, 0, &crypto);
68    if (ret)
69	goto out;
70    ret = krb5_decrypt_EncryptedData(context,
71				     crypto,
72				     KRB5_KU_AP_REQ_ENC_PART,
73				     &ap_rep.enc_part,
74				     &data);
75    krb5_crypto_destroy(context, crypto);
76    if (ret)
77	goto out;
78
79    *repl = malloc(sizeof(**repl));
80    if (*repl == NULL) {
81	ret = krb5_enomem(context);
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        goto out;
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	    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    if (ret) {
107        krb5_free_ap_rep_enc_part(context, *repl);
108        *repl = NULL;
109    }
110    krb5_data_free(&data);
111    free_AP_REP(&ap_rep);
112    return ret;
113}
114
115KRB5_LIB_FUNCTION void KRB5_LIB_CALL
116krb5_free_ap_rep_enc_part (krb5_context context,
117			   krb5_ap_rep_enc_part *val)
118{
119    if (val) {
120	free_EncAPRepPart (val);
121	free (val);
122    }
123}
124