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/* $Id: pkcs7-asn1-decoder.cpp $ */
/** @file
* IPRT - Crypto - PKCS \#7, Decoder for ASN.1.
*/
/*
* Copyright (C) 2006-2020 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "internal/iprt.h"
#include <iprt/crypto/pkcs7.h>
#include <iprt/err.h>
#include <iprt/string.h>
#include <iprt/crypto/spc.h>
#include <iprt/crypto/tsp.h>
#include "pkcs7-internal.h"
/*
* PKCS #7 ContentInfo
*/
typedef enum RTCRPKCS7CONTENTINFOCHOICE
{
RTCRPKCS7CONTENTINFOCHOICE_INVALID = 0,
RTCRPKCS7CONTENTINFOCHOICE_UNKNOWN,
RTCRPKCS7CONTENTINFOCHOICE_SIGNED_DATA,
RTCRPKCS7CONTENTINFOCHOICE_SPC_INDIRECT_DATA_CONTENT,
RTCRPKCS7CONTENTINFOCHOICE_TSP_TST_INFO,
RTCRPKCS7CONTENTINFOCHOICE_END,
RTCRPKCS7CONTENTINFOCHOICE_32BIT_HACK = 0x7fffffff
} RTCRPKCS7CONTENTINFOCHOICE;
static int rtCrPkcs7ContentInfo_DecodeExtra(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTCRPKCS7CONTENTINFO pThis,
const char *pszErrorTag)
{
RT_NOREF_PV(fFlags); RT_NOREF_PV(pszErrorTag);
pThis->u.pCore = NULL;
/*
* Figure the type.
*/
RTCRPKCS7CONTENTINFOCHOICE enmChoice;
size_t cbContent = 0;
if (RTAsn1ObjId_CompareWithString(&pThis->ContentType, RTCRPKCS7SIGNEDDATA_OID) == 0)
{
enmChoice = RTCRPKCS7CONTENTINFOCHOICE_SIGNED_DATA;
cbContent = sizeof(*pThis->u.pSignedData);
}
else if (RTAsn1ObjId_CompareWithString(&pThis->ContentType, RTCRSPCINDIRECTDATACONTENT_OID) == 0)
{
enmChoice = RTCRPKCS7CONTENTINFOCHOICE_SPC_INDIRECT_DATA_CONTENT;
cbContent = sizeof(*pThis->u.pIndirectDataContent);
}
else if (RTAsn1ObjId_CompareWithString(&pThis->ContentType, RTCRTSPTSTINFO_OID) == 0)
{
enmChoice = RTCRPKCS7CONTENTINFOCHOICE_TSP_TST_INFO;
cbContent = sizeof(*pThis->u.pTstInfo);
}
else
{
enmChoice = RTCRPKCS7CONTENTINFOCHOICE_UNKNOWN;
cbContent = 0;
}
int rc = VINF_SUCCESS;
if (enmChoice != RTCRPKCS7CONTENTINFOCHOICE_UNKNOWN)
{
/*
* Detect CMS octet string format and open the content cursor.
*
* Current we don't have any octent string content which, they're all
* sequences, which make detection so much simpler.
*/
PRTASN1OCTETSTRING pOctetString = &pThis->Content;
RTASN1CURSOR ContentCursor;
rc = RTAsn1CursorInitSubFromCore(pCursor, &pThis->Content.Asn1Core, &ContentCursor, "Content");
if ( RT_SUCCESS(rc)
&& RTAsn1CursorIsNextEx(&ContentCursor, ASN1_TAG_OCTET_STRING, ASN1_TAGFLAG_PRIMITIVE | ASN1_TAGCLASS_UNIVERSAL))
{
rc = RTAsn1MemAllocZ(&pThis->Content.EncapsulatedAllocation, (void **)&pThis->Content.pEncapsulated,
sizeof(*pOctetString));
if (RT_SUCCESS(rc))
{
pThis->pCmsContent = pOctetString = (PRTASN1OCTETSTRING)pThis->Content.pEncapsulated;
rc = RTAsn1OctetString_DecodeAsn1(&ContentCursor, 0, pOctetString, "CmsContent");
if (RT_SUCCESS(rc))
rc = RTAsn1CursorCheckEnd(&ContentCursor);
if (RT_SUCCESS(rc))
rc = RTAsn1CursorInitSubFromCore(pCursor, &pOctetString->Asn1Core, &ContentCursor, "CmsContent");
}
}
if (RT_SUCCESS(rc))
{
/*
* Allocate memory for the decoded content.
*/
rc = RTAsn1MemAllocZ(&pOctetString->EncapsulatedAllocation, (void **)&pOctetString->pEncapsulated, cbContent);
if (RT_SUCCESS(rc))
{
pThis->u.pCore = pOctetString->pEncapsulated;
/*
* Decode it.
*/
switch (enmChoice)
{
case RTCRPKCS7CONTENTINFOCHOICE_SIGNED_DATA:
rc = RTCrPkcs7SignedData_DecodeAsn1(&ContentCursor, 0, pThis->u.pSignedData, "SignedData");
break;
case RTCRPKCS7CONTENTINFOCHOICE_SPC_INDIRECT_DATA_CONTENT:
rc = RTCrSpcIndirectDataContent_DecodeAsn1(&ContentCursor, 0, pThis->u.pIndirectDataContent,
"IndirectDataContent");
break;
case RTCRPKCS7CONTENTINFOCHOICE_TSP_TST_INFO:
rc = RTCrTspTstInfo_DecodeAsn1(&ContentCursor, 0, pThis->u.pTstInfo, "TstInfo");
break;
default:
AssertFailed();
rc = VERR_IPE_NOT_REACHED_DEFAULT_CASE;
break;
}
if (RT_SUCCESS(rc))
rc = RTAsn1CursorCheckOctStrEnd(&ContentCursor, &pThis->Content);
if (RT_SUCCESS(rc))
return VINF_SUCCESS;
RTAsn1MemFree(&pOctetString->EncapsulatedAllocation, pOctetString->pEncapsulated);
pOctetString->pEncapsulated = NULL;
pThis->u.pCore = NULL;
}
}
}
return rc;
}
/*
* Generate the code.
*/
#include <iprt/asn1-generator-asn1-decoder.h>
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