1/*	$NetBSD: encapsulate.c,v 1.1.1.1 2011/04/13 18:14:45 elric 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 "gsskrb5_locl.h"
37
38void
39_gssapi_encap_length (size_t data_len,
40		      size_t *len,
41		      size_t *total_len,
42		      const gss_OID mech)
43{
44    size_t len_len;
45
46    *len = 1 + 1 + mech->length + data_len;
47
48    len_len = der_length_len(*len);
49
50    *total_len = 1 + len_len + *len;
51}
52
53void
54_gsskrb5_encap_length (size_t data_len,
55			  size_t *len,
56			  size_t *total_len,
57			  const gss_OID mech)
58{
59    _gssapi_encap_length(data_len + 2, len, total_len, mech);
60}
61
62void *
63_gsskrb5_make_header (void *ptr,
64			 size_t len,
65			 const void *type,
66			 const gss_OID mech)
67{
68    u_char *p = ptr;
69    p = _gssapi_make_mech_header(p, len, mech);
70    memcpy (p, type, 2);
71    p += 2;
72    return p;
73}
74
75void *
76_gssapi_make_mech_header(void *ptr,
77			 size_t len,
78			 const gss_OID mech)
79{
80    u_char *p = ptr;
81    int e;
82    size_t len_len, foo;
83
84    *p++ = 0x60;
85    len_len = der_length_len(len);
86    e = der_put_length (p + len_len - 1, len_len, len, &foo);
87    if(e || foo != len_len)
88	abort ();
89    p += len_len;
90    *p++ = 0x06;
91    *p++ = mech->length;
92    memcpy (p, mech->elements, mech->length);
93    p += mech->length;
94    return p;
95}
96
97/*
98 * Give it a krb5_data and it will encapsulate with extra GSS-API wrappings.
99 */
100
101OM_uint32
102_gssapi_encapsulate(
103    OM_uint32 *minor_status,
104    const krb5_data *in_data,
105    gss_buffer_t output_token,
106    const gss_OID mech
107)
108{
109    size_t len, outer_len;
110    void *p;
111
112    _gssapi_encap_length (in_data->length, &len, &outer_len, mech);
113
114    output_token->length = outer_len;
115    output_token->value  = malloc (outer_len);
116    if (output_token->value == NULL) {
117	*minor_status = ENOMEM;
118	return GSS_S_FAILURE;
119    }
120
121    p = _gssapi_make_mech_header (output_token->value, len, mech);
122    memcpy (p, in_data->data, in_data->length);
123    return GSS_S_COMPLETE;
124}
125
126/*
127 * Give it a krb5_data and it will encapsulate with extra GSS-API krb5
128 * wrappings.
129 */
130
131OM_uint32
132_gsskrb5_encapsulate(
133			OM_uint32 *minor_status,
134			const krb5_data *in_data,
135			gss_buffer_t output_token,
136			const void *type,
137			const gss_OID mech
138)
139{
140    size_t len, outer_len;
141    u_char *p;
142
143    _gsskrb5_encap_length (in_data->length, &len, &outer_len, mech);
144
145    output_token->length = outer_len;
146    output_token->value  = malloc (outer_len);
147    if (output_token->value == NULL) {
148	*minor_status = ENOMEM;
149	return GSS_S_FAILURE;
150    }
151
152    p = _gsskrb5_make_header (output_token->value, len, type, mech);
153    memcpy (p, in_data->data, in_data->length);
154    return GSS_S_COMPLETE;
155}
156