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 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 *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
115 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_free_ap_rep_enc_part(krb5_context context,krb5_ap_rep_enc_part * val)116 krb5_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