1/*	$NetBSD: mk_priv.c,v 1.2 2017/01/28 21:31:49 christos Exp $	*/
2
3/*
4 * Copyright (c) 1997 - 2003 Kungliga Tekniska H��gskolan
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
38KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
39krb5_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	free(buf);
141	return krb5_enomem(context);
142    }
143    free (buf);
144    if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE)
145	auth_context->local_seqnumber =
146	    (auth_context->local_seqnumber + 1) & 0xFFFFFFFF;
147    return 0;
148
149  fail:
150    free (buf);
151    krb5_data_free (&s.enc_part.cipher);
152    return ret;
153}
154