mk_rep.c revision 120945 
1/*
2 * Copyright (c) 1997 - 2002 Kungliga Tekniska H�gskolan
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
36RCSID("$Id: mk_rep.c,v 1.21 2002/12/19 13:30:36 joda Exp $");
37
38krb5_error_code
39krb5_mk_rep(krb5_context context,
40	    krb5_auth_context auth_context,
41	    krb5_data *outbuf)
42{
43    krb5_error_code ret;
44    AP_REP ap;
45    EncAPRepPart body;
46    u_char *buf = NULL;
47    size_t buf_size;
48    size_t len;
49    krb5_crypto crypto;
50
51    ap.pvno = 5;
52    ap.msg_type = krb_ap_rep;
53
54    memset (&body, 0, sizeof(body));
55
56    body.ctime = auth_context->authenticator->ctime;
57    body.cusec = auth_context->authenticator->cusec;
58    body.subkey = NULL;
59    if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
60	krb5_generate_seq_number (context,
61				  auth_context->keyblock,
62				  &auth_context->local_seqnumber);
63	body.seq_number = malloc (sizeof(*body.seq_number));
64	if (body.seq_number == NULL) {
65	    krb5_set_error_string (context, "malloc: out of memory");
66	    return ENOMEM;
67	}
68	*(body.seq_number) = auth_context->local_seqnumber;
69    } else
70	body.seq_number = NULL;
71
72    ap.enc_part.etype = auth_context->keyblock->keytype;
73    ap.enc_part.kvno  = NULL;
74
75    ASN1_MALLOC_ENCODE(EncAPRepPart, buf, buf_size, &body, &len, ret);
76    free_EncAPRepPart (&body);
77    if(ret)
78	return ret;
79    ret = krb5_crypto_init(context, auth_context->keyblock,
80			   0 /* ap.enc_part.etype */, &crypto);
81    if (ret) {
82	free (buf);
83	return ret;
84    }
85    ret = krb5_encrypt (context,
86			crypto,
87			KRB5_KU_AP_REQ_ENC_PART,
88			buf + buf_size - len,
89			len,
90			&ap.enc_part.cipher);
91    krb5_crypto_destroy(context, crypto);
92    free(buf);
93    if (ret)
94	return ret;
95
96    ASN1_MALLOC_ENCODE(AP_REP, outbuf->data, outbuf->length, &ap, &len, ret);
97    free_AP_REP (&ap);
98    return ret;
99}
100