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
krb5_rd_rep(krb5_context context,krb5_auth_context auth_context,const krb5_data * inbuf,krb5_ap_rep_enc_part ** repl)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
krb5_free_ap_rep_enc_part(krb5_context context,krb5_ap_rep_enc_part * val)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