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
36KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
37krb5_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
111KRB5_LIB_FUNCTION void KRB5_LIB_CALL
112krb5_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