File: build.c

package info (click to toggle)
strongswan 2.8.0+dfsg-1+etch2
  • links: PTS
  • area: main
  • in suites: etch
  • size: 15,344 kB
  • ctags: 15,752
  • sloc: ansic: 104,081; sh: 6,913; asm: 4,026; perl: 3,711; makefile: 3,215; pascal: 250; yacc: 221; lex: 190; xml: 147; awk: 124; sed: 98; lisp: 3
file content (242 lines) | stat: -rw-r--r-- 5,473 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
/* Build a X.509 attribute certificate
 * Copyright (C) 2002  Ueli Galizzi, Ariane Seiler
 * Copyright (C) 2004  Andreas Steffen
 * Zuercher Hochschule Winterthur, Switzerland
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * RCSID $Id: build.c,v 1.14 2005/09/06 11:47:57 as Exp $
 */

#include <stdlib.h>
#include <string.h>

#include <freeswan.h>

#include "../pluto/constants.h"
#include "../pluto/defs.h"
#include "../pluto/oid.h"
#include "../pluto/asn1.h"
#include "../pluto/x509.h"
#include "../pluto/log.h"

#include "build.h"

static u_char ASN1_group_oid_str[] = {
    0x06, 0x08,
          0x2b, 0x06, 0x01, 0x05, 0x05, 0x07, 0x0a ,0x04
};

static const chunk_t ASN1_group_oid = strchunk(ASN1_group_oid_str);

static u_char ASN1_authorityKeyIdentifier_oid_str[] = {
    0x06, 0x03,
          0x55, 0x1d, 0x23
};

static const chunk_t ASN1_authorityKeyIdentifier_oid
	  = strchunk(ASN1_authorityKeyIdentifier_oid_str);

static u_char ASN1_noRevAvail_ext_str[] = {
    0x30, 0x09,
          0x06, 0x03,
	        0x55, 0x1d, 0x38,
	  0x04, 0x02,
	        0x05, 0x00
};

static const chunk_t ASN1_noRevAvail_ext = strchunk(ASN1_noRevAvail_ext_str);

/*
 * build directoryName
 */
static chunk_t
build_directoryName(asn1_t tag, chunk_t name)
{
    return asn1_wrap(tag, "m"
		, asn1_simple_object(ASN1_CONTEXT_C_4, name));
}

/*
 * build holder
 */
static chunk_t
build_holder(void)
{
    return asn1_wrap(ASN1_SEQUENCE, "mm"
		, asn1_wrap(ASN1_CONTEXT_C_0, "mm"
		    , build_directoryName(ASN1_SEQUENCE, user->issuer)
		    , asn1_simple_object(ASN1_INTEGER, user->serialNumber)
		  )
		, build_directoryName(ASN1_CONTEXT_C_1, user->subject));
}

/*
 * build v2Form
 */
static chunk_t
build_v2_form(void)
{
    return asn1_wrap(ASN1_CONTEXT_C_0, "m"
		, build_directoryName(ASN1_SEQUENCE, signer->subject));
}

/*
 * build attrCertValidityPeriod
 */
static chunk_t
build_attr_cert_validity(void)
{
    return asn1_wrap(ASN1_SEQUENCE, "mm"
		, timetoasn1(&notBefore, ASN1_GENERALIZEDTIME) 
		, timetoasn1(&notAfter,  ASN1_GENERALIZEDTIME));
}

/*
 * build attributes
 */
static chunk_t
build_ietfAttributes(ietfAttrList_t *list)
{
    chunk_t ietfAttributes;
    ietfAttrList_t *item = list;
    size_t size = 0;
    u_char *pos;

    /* precalculate the total size of all values */
    while (item != NULL)
    {
	size_t len = item->attr->value.len;

	size += 1 + (len > 0) + (len >= 128) + (len >= 256) + (len >= 65536) + len;
	item = item->next;
    }
    pos = build_asn1_object(&ietfAttributes, ASN1_SEQUENCE, size);

    while (list != NULL)
    {
	ietfAttr_t *attr = list->attr;
	asn1_t type = ASN1_NULL;

	switch (attr->kind)
	{
	case IETF_ATTRIBUTE_OCTETS:
	    type = ASN1_OCTET_STRING;
	    break;
	case IETF_ATTRIBUTE_STRING:
	    type = ASN1_UTF8STRING;
	    break;
	case IETF_ATTRIBUTE_OID:
	    type = ASN1_OID;
	    break;
	}
	mv_chunk(&pos, asn1_simple_object(type, attr->value));

	list = list->next;
    }

    return asn1_wrap(ASN1_SEQUENCE, "m", ietfAttributes);
}

/*
 * build attribute type
 */
static chunk_t
build_attribute_type(const chunk_t type, chunk_t content)
{
    return asn1_wrap(ASN1_SEQUENCE, "cm"
		, type
		, asn1_wrap(ASN1_SET, "m", content));
}

/*
 * build attributes
 */
static chunk_t
build_attributes(void)
{
     return asn1_wrap(ASN1_SEQUENCE, "m"
		, build_attribute_type(ASN1_group_oid
		    , build_ietfAttributes(groups)));
}

/*
 * build authorityKeyIdentifier
 */
static chunk_t
build_authorityKeyID(x509cert_t *signer)
{
    chunk_t keyIdentifier = (signer->subjectKeyID.ptr == NULL)
			? empty_chunk
			: asn1_simple_object(ASN1_CONTEXT_S_0
				, signer->subjectKeyID);

    chunk_t authorityCertIssuer = build_directoryName(ASN1_CONTEXT_C_1
				, signer->issuer);

    chunk_t authorityCertSerialNumber = asn1_simple_object(ASN1_CONTEXT_S_2
				, signer->serialNumber);

    return asn1_wrap(ASN1_SEQUENCE, "cm"
		, ASN1_authorityKeyIdentifier_oid
		, asn1_wrap(ASN1_OCTET_STRING, "m"
		    , asn1_wrap(ASN1_SEQUENCE, "mmm"
			, keyIdentifier
			, authorityCertIssuer
			, authorityCertSerialNumber
		      )
		  )
	   );
}

/*
 * build extensions
 */
static chunk_t
build_extensions(void)
{
    return asn1_wrap(ASN1_SEQUENCE, "mc"
		, build_authorityKeyID(signer)
		, ASN1_noRevAvail_ext);
}

/*
 * build attributeCertificateInfo
 */
static chunk_t
build_attr_cert_info(void)
{
    return asn1_wrap(ASN1_SEQUENCE, "cmmcmmmm"
		, ASN1_INTEGER_1
		, build_holder()
		, build_v2_form()
		, ASN1_sha1WithRSA_id
		, asn1_simple_object(ASN1_INTEGER, serial)
		, build_attr_cert_validity()
		, build_attributes()
		, build_extensions());
}

/*
 * build an X.509 attribute certificate
 */
chunk_t
build_attr_cert(void)
{
    chunk_t attributeCertificateInfo = build_attr_cert_info();
    chunk_t signatureValue = pkcs1_build_signature(attributeCertificateInfo
				, OID_SHA1, signerkey, TRUE);

    return asn1_wrap(ASN1_SEQUENCE, "mcm"
		, attributeCertificateInfo
		, ASN1_sha1WithRSA_id
		, signatureValue);
}