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/*
* Copyright (C) 2012 Martin Willi
* Copyright (C) 2012 revosec AG
* Copyright (C) 2012 Tobias Brunner
* Copyright (C) 2002-2008 Andreas Steffen
* Copyright (C) 2005 Jan Hutter, Martin Willi
* 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.
*/
#include "pkcs7_generic.h"
#include "pkcs7_data.h"
#include "pkcs7_signed_data.h"
#include "pkcs7_enveloped_data.h"
#include <utils/debug.h>
#include <asn1/oid.h>
#include <asn1/asn1.h>
#include <asn1/asn1_parser.h>
/**
* ASN.1 definition of the PKCS#7 ContentInfo type
*/
static const asn1Object_t contentInfoObjects[] = {
{ 0, "contentInfo", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */
{ 1, "contentType", ASN1_OID, ASN1_BODY }, /* 1 */
{ 1, "content", ASN1_CONTEXT_C_0, ASN1_OPT |
ASN1_BODY }, /* 2 */
{ 1, "end opt", ASN1_EOC, ASN1_END }, /* 3 */
{ 0, "exit", ASN1_EOC, ASN1_EXIT }
};
#define PKCS7_INFO_TYPE 1
#define PKCS7_INFO_CONTENT 2
/**
* Parse PKCS#7 contentInfo object
*/
static pkcs7_t* parse_contentInfo(chunk_t blob)
{
asn1_parser_t *parser;
chunk_t object, content = chunk_empty;
int objectID, type = OID_UNKNOWN;
bool success = FALSE;
parser = asn1_parser_create(contentInfoObjects, blob);
parser->set_top_level(parser, 0);
while (parser->iterate(parser, &objectID, &object))
{
if (objectID == PKCS7_INFO_TYPE)
{
type = asn1_known_oid(object);
if (type < OID_PKCS7_DATA || type > OID_PKCS7_ENCRYPTED_DATA)
{
DBG1(DBG_ASN, "unknown pkcs7 content type");
goto end;
}
}
else if (objectID == PKCS7_INFO_CONTENT)
{
content = object;
}
}
success = parser->success(parser);
end:
parser->destroy(parser);
if (success)
{
switch (type)
{
case OID_PKCS7_DATA:
return pkcs7_data_load(blob, content);
case OID_PKCS7_SIGNED_DATA:
return pkcs7_signed_data_load(blob, content);
case OID_PKCS7_ENVELOPED_DATA:
return pkcs7_enveloped_data_load(blob, content);
default:
DBG1(DBG_ASN, "pkcs7 content type %d not supported", type);
return NULL;
}
}
return NULL;
}
pkcs7_t *pkcs7_generic_load(container_type_t type, va_list args)
{
chunk_t blob = chunk_empty;
while (TRUE)
{
switch (va_arg(args, builder_part_t))
{
case BUILD_BLOB_ASN1_DER:
blob = va_arg(args, chunk_t);
continue;
case BUILD_END:
break;
default:
return NULL;
}
break;
}
if (blob.len)
{
if (blob.len >= 2 &&
blob.ptr[0] == ASN1_SEQUENCE && blob.ptr[1] == 0x80)
{ /* looks like infinite length BER encoding, but we can't handle it.
* ignore silently, our openssl backend can handle it */
return NULL;
}
return parse_contentInfo(blob);
}
return NULL;
}
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