1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /* lib/krb5/krb/mk_rep.c */
3 /*
4 * Copyright 1990 by the Massachusetts Institute of Technology.
5 * All Rights Reserved.
6 *
7 * Export of this software from the United States of America may
8 * require a specific license from the United States Government.
9 * It is the responsibility of any person or organization contemplating
10 * export to obtain such a license before exporting.
11 *
12 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
13 * distribute this software and its documentation for any purpose and
14 * without fee is hereby granted, provided that the above copyright
15 * notice appear in all copies and that both that copyright notice and
16 * this permission notice appear in supporting documentation, and that
17 * the name of M.I.T. not be used in advertising or publicity pertaining
18 * to distribution of the software without specific, written prior
19 * permission. Furthermore if you modify this software you must label
20 * your software as modified software and not distribute it in such a
21 * fashion that it might be confused with the original M.I.T. software.
22 * M.I.T. makes no representations about the suitability of
23 * this software for any purpose. It is provided "as is" without express
24 * or implied warranty.
25 */
26 /*
27 * Copyright (c) 2006-2008, Novell, Inc.
28 * All rights reserved.
29 *
30 * Redistribution and use in source and binary forms, with or without
31 * modification, are permitted provided that the following conditions are met:
32 *
33 * * Redistributions of source code must retain the above copyright notice,
34 * this list of conditions and the following disclaimer.
35 * * Redistributions in binary form must reproduce the above copyright
36 * notice, this list of conditions and the following disclaimer in the
37 * documentation and/or other materials provided with the distribution.
38 * * The copyright holder's name is not used to endorse or promote products
39 * derived from this software without specific prior written permission.
40 *
41 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
42 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
45 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
46 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
47 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
48 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
49 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
51 * POSSIBILITY OF SUCH DAMAGE.
52 */
53
54 #include "k5-int.h"
55 #include "int-proto.h"
56 #include "auth_con.h"
57
58 /*
59 Formats a KRB_AP_REP message into outbuf.
60
61 The outbuf buffer storage is allocated, and should be freed by the
62 caller when finished.
63
64 returns system errors
65 */
66
67 static krb5_error_code
k5_mk_rep(krb5_context context,krb5_auth_context auth_context,krb5_data * outbuf,int dce_style)68 k5_mk_rep(krb5_context context, krb5_auth_context auth_context,
69 krb5_data *outbuf, int dce_style)
70 {
71 krb5_error_code retval;
72 krb5_ap_rep_enc_part repl;
73 krb5_ap_rep reply;
74 krb5_data * scratch;
75 krb5_data * toutbuf;
76
77 /* Make the reply */
78 if (((auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) ||
79 (auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE)) &&
80 (auth_context->local_seq_number == 0)) {
81 if ((retval = krb5_generate_seq_number(context,
82 &auth_context->key->keyblock,
83 &auth_context->local_seq_number)))
84 return(retval);
85 }
86
87 if (dce_style) {
88 krb5_us_timeofday(context, &repl.ctime, &repl.cusec);
89 } else {
90 repl.ctime = auth_context->authentp->ctime;
91 repl.cusec = auth_context->authentp->cusec;
92 }
93
94 if (dce_style)
95 repl.subkey = NULL;
96 else if (auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_USE_SUBKEY) {
97 assert(auth_context->negotiated_etype != ENCTYPE_NULL);
98
99 retval = k5_generate_and_save_subkey(context, auth_context,
100 &auth_context->key->keyblock,
101 auth_context->negotiated_etype);
102 if (retval)
103 return retval;
104 repl.subkey = &auth_context->send_subkey->keyblock;
105 } else
106 repl.subkey = auth_context->authentp->subkey;
107
108 if (dce_style)
109 repl.seq_number = auth_context->remote_seq_number;
110 else
111 repl.seq_number = auth_context->local_seq_number;
112
113 TRACE_MK_REP(context, repl.ctime, repl.cusec, repl.subkey,
114 repl.seq_number);
115
116 /* encode it before encrypting */
117 if ((retval = encode_krb5_ap_rep_enc_part(&repl, &scratch)))
118 return retval;
119
120 if ((retval = k5_encrypt_keyhelper(context, auth_context->key,
121 KRB5_KEYUSAGE_AP_REP_ENCPART, scratch,
122 &reply.enc_part)))
123 goto cleanup_scratch;
124
125 if (!(retval = encode_krb5_ap_rep(&reply, &toutbuf))) {
126 *outbuf = *toutbuf;
127 free(toutbuf);
128 }
129
130 memset(reply.enc_part.ciphertext.data, 0, reply.enc_part.ciphertext.length);
131 free(reply.enc_part.ciphertext.data);
132 reply.enc_part.ciphertext.length = 0;
133 reply.enc_part.ciphertext.data = 0;
134
135 cleanup_scratch:
136 memset(scratch->data, 0, scratch->length);
137 krb5_free_data(context, scratch);
138
139 return retval;
140 }
141
142 krb5_error_code KRB5_CALLCONV
krb5_mk_rep(krb5_context context,krb5_auth_context auth_context,krb5_data * outbuf)143 krb5_mk_rep(krb5_context context, krb5_auth_context auth_context, krb5_data *outbuf)
144 {
145 return k5_mk_rep(context, auth_context, outbuf, 0);
146 }
147
148 krb5_error_code KRB5_CALLCONV
krb5_mk_rep_dce(krb5_context context,krb5_auth_context auth_context,krb5_data * outbuf)149 krb5_mk_rep_dce(krb5_context context, krb5_auth_context auth_context, krb5_data *outbuf)
150 {
151 return k5_mk_rep(context, auth_context, outbuf, 1);
152 }
153