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/* 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(¬Before, ASN1_GENERALIZEDTIME),
timetoasn1(¬After, 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);
}
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