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/* Build a X.509 attribute certificate
* Copyright (C) 2002 Ueli Galizzi, Ariane Seiler
* Copyright (C) 2004,2007 Andreas Steffen
* Hochschule fuer Technik Rapperswil, 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 3270 2007-10-08 20:09:57Z andreas $
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <asn1/oid.h>
#include <asn1/asn1.h>
#include <crypto/ietf_attr_list.h>
#include <utils/identification.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 = chunk_from_buf(ASN1_group_oid_str);
static u_char ASN1_authorityKeyIdentifier_oid_str[] = {
0x06, 0x03,
0x55, 0x1d, 0x23
};
static const chunk_t ASN1_authorityKeyIdentifier_oid =
chunk_from_buf(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 = chunk_from_buf(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)
{
identification_t *issuer = usercert->get_issuer(usercert);
identification_t *subject = usercert->get_subject(usercert);
return asn1_wrap(ASN1_SEQUENCE, "mm",
asn1_wrap(ASN1_CONTEXT_C_0, "mm",
build_directoryName(ASN1_SEQUENCE, issuer->get_encoding(issuer)),
asn1_simple_object(ASN1_INTEGER, usercert->get_serialNumber(usercert))
),
build_directoryName(ASN1_CONTEXT_C_1, subject->get_encoding(subject)));
}
/**
* build v2Form
*/
static chunk_t build_v2_form(void)
{
identification_t *subject = signercert->get_subject(signercert);
return asn1_wrap(ASN1_CONTEXT_C_0, "m",
build_directoryName(ASN1_SEQUENCE, subject->get_encoding(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 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, ietfAttr_list_encode(groups)));
}
/**
* build authorityKeyIdentifier
*/
static chunk_t build_authorityKeyID(x509_t *signer)
{
identification_t *issuer = signer->get_issuer(signer);
chunk_t subjectKeyID = signer->get_subjectKeyID(signer);
chunk_t keyIdentifier = (subjectKeyID.ptr == NULL)
? chunk_empty
: asn1_simple_object(ASN1_CONTEXT_S_0, subjectKeyID);
chunk_t authorityCertIssuer = build_directoryName(ASN1_CONTEXT_C_1,
issuer->get_encoding(issuer));
chunk_t authorityCertSerialNumber = asn1_simple_object(ASN1_CONTEXT_S_2,
signer->get_serialNumber(signer));
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(signercert),
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)
{
u_char *pos;
chunk_t rawSignature, signatureValue;
chunk_t attributeCertificateInfo = build_attr_cert_info();
/* build the signature */
signerkey->build_emsa_pkcs1_signature(signerkey, HASH_SHA1,
attributeCertificateInfo, &rawSignature);
pos = build_asn1_object(&signatureValue, ASN1_BIT_STRING,
1 + rawSignature.len);
*pos++ = 0x00;
memcpy(pos, rawSignature.ptr, rawSignature.len);
free(rawSignature.ptr);
return asn1_wrap(ASN1_SEQUENCE, "mcm",
attributeCertificateInfo,
ASN1_sha1WithRSA_id,
signatureValue);
}
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