1 /* $NetBSD: mk_priv.c,v 1.1.1.2 2014/04/24 12:45:50 pettai Exp $ */
2
3 /*
4 * Copyright (c) 1997 - 2003 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_mk_priv(krb5_context context,krb5_auth_context auth_context,const krb5_data * userdata,krb5_data * outbuf,krb5_replay_data * outdata)39 krb5_mk_priv(krb5_context context,
40 krb5_auth_context auth_context,
41 const krb5_data *userdata,
42 krb5_data *outbuf,
43 krb5_replay_data *outdata)
44 {
45 krb5_error_code ret;
46 KRB_PRIV s;
47 EncKrbPrivPart part;
48 u_char *buf = NULL;
49 size_t buf_size;
50 size_t len = 0;
51 krb5_crypto crypto;
52 krb5_keyblock *key;
53 krb5_replay_data rdata;
54
55 if ((auth_context->flags &
56 (KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE)) &&
57 outdata == NULL)
58 return KRB5_RC_REQUIRED; /* XXX better error, MIT returns this */
59
60 if (auth_context->local_subkey)
61 key = auth_context->local_subkey;
62 else if (auth_context->remote_subkey)
63 key = auth_context->remote_subkey;
64 else
65 key = auth_context->keyblock;
66
67 memset(&rdata, 0, sizeof(rdata));
68
69 part.user_data = *userdata;
70
71 krb5_us_timeofday (context, &rdata.timestamp, &rdata.usec);
72
73 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
74 part.timestamp = &rdata.timestamp;
75 part.usec = &rdata.usec;
76 } else {
77 part.timestamp = NULL;
78 part.usec = NULL;
79 }
80
81 if (auth_context->flags & KRB5_AUTH_CONTEXT_RET_TIME) {
82 outdata->timestamp = rdata.timestamp;
83 outdata->usec = rdata.usec;
84 }
85
86 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
87 rdata.seq = auth_context->local_seqnumber;
88 part.seq_number = &rdata.seq;
89 } else
90 part.seq_number = NULL;
91
92 if (auth_context->flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE)
93 outdata->seq = auth_context->local_seqnumber;
94
95 part.s_address = auth_context->local_address;
96 part.r_address = auth_context->remote_address;
97
98 krb5_data_zero (&s.enc_part.cipher);
99
100 ASN1_MALLOC_ENCODE(EncKrbPrivPart, buf, buf_size, &part, &len, ret);
101 if (ret)
102 goto fail;
103 if (buf_size != len)
104 krb5_abortx(context, "internal error in ASN.1 encoder");
105
106 s.pvno = 5;
107 s.msg_type = krb_priv;
108 s.enc_part.etype = key->keytype;
109 s.enc_part.kvno = NULL;
110
111 ret = krb5_crypto_init(context, key, 0, &crypto);
112 if (ret) {
113 free (buf);
114 return ret;
115 }
116 ret = krb5_encrypt (context,
117 crypto,
118 KRB5_KU_KRB_PRIV,
119 buf + buf_size - len,
120 len,
121 &s.enc_part.cipher);
122 krb5_crypto_destroy(context, crypto);
123 if (ret) {
124 free(buf);
125 return ret;
126 }
127 free(buf);
128
129
130 ASN1_MALLOC_ENCODE(KRB_PRIV, buf, buf_size, &s, &len, ret);
131 if (ret)
132 goto fail;
133 if (buf_size != len)
134 krb5_abortx(context, "internal error in ASN.1 encoder");
135
136 krb5_data_free (&s.enc_part.cipher);
137
138 ret = krb5_data_copy(outbuf, buf + buf_size - len, len);
139 if (ret) {
140 krb5_set_error_message(context, ENOMEM,
141 N_("malloc: out of memory", ""));
142 free(buf);
143 return ENOMEM;
144 }
145 free (buf);
146 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE)
147 auth_context->local_seqnumber =
148 (auth_context->local_seqnumber + 1) & 0xFFFFFFFF;
149 return 0;
150
151 fail:
152 free (buf);
153 krb5_data_free (&s.enc_part.cipher);
154 return ret;
155 }
156