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