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/* $Id: asn1-ut-string-decode.cpp $ */
/** @file
* IPRT - ASN.1, XXX STRING Types, Decoding.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* 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, in version 3 of the
* License.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "internal/iprt.h"
#include <iprt/asn1.h>
#include <iprt/alloca.h>
#include <iprt/err.h>
#include <iprt/string.h>
#include <iprt/ctype.h>
#include <iprt/formats/asn1.h>
RTDECL(int) RTAsn1String_DecodeAsn1(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1STRING pThis, const char *pszErrorTag)
{
RT_ZERO(*pThis);
AssertReturn(!(fFlags & RTASN1CURSOR_GET_F_IMPLICIT), VERR_INVALID_PARAMETER);
int rc = RTAsn1CursorReadHdr(pCursor, &pThis->Asn1Core, pszErrorTag);
if (RT_SUCCESS(rc))
{
/*
* Do tag matching.
*/
switch (pThis->Asn1Core.uTag)
{
case ASN1_TAG_UTF8_STRING:
case ASN1_TAG_NUMERIC_STRING:
case ASN1_TAG_PRINTABLE_STRING:
case ASN1_TAG_T61_STRING:
case ASN1_TAG_VIDEOTEX_STRING:
case ASN1_TAG_IA5_STRING:
case ASN1_TAG_GENERALIZED_TIME:
case ASN1_TAG_GRAPHIC_STRING:
case ASN1_TAG_VISIBLE_STRING:
case ASN1_TAG_GENERAL_STRING:
case ASN1_TAG_UNIVERSAL_STRING:
case ASN1_TAG_BMP_STRING:
rc = VINF_SUCCESS;
break;
default:
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_TAG_MISMATCH,
"%s: Not a string object: fClass=%#x / uTag=%#x",
pszErrorTag, pThis->Asn1Core.fClass, pThis->Asn1Core.uTag);
}
if (RT_SUCCESS(rc))
{
/*
* Match flags. CER/DER makes it complicated.
*/
if (pThis->Asn1Core.fClass == (ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_PRIMITIVE))
{
/*
* Primitive strings are simple.
*/
RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
pThis->Asn1Core.pOps = &g_RTAsn1String_Vtable;
pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
RTAsn1CursorInitAllocation(pCursor, &pThis->Allocation);
/* UTF-8 conversion is done lazily, upon request. */
return VINF_SUCCESS;
}
if (pThis->Asn1Core.fClass == (ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_CONSTRUCTED))
{
/*
* Constructed strings are not yet fully implemented.
*/
if (pCursor->fFlags & RTASN1CURSOR_FLAGS_DER)
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_ILLEGAL_CONSTRUCTED_STRING,
"%s: DER encoding does not allow constructed strings (cb=%#x uTag=%#x fClass=%#x)",
pszErrorTag, pThis->Asn1Core.cb, pThis->Asn1Core.uTag, pThis->Asn1Core.fClass);
else if (pCursor->fFlags & RTASN1CURSOR_FLAGS_CER)
{
if (pThis->Asn1Core.cb > 1000)
rc = VINF_SUCCESS;
else
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_ILLEGAL_CONSTRUCTED_STRING,
"%s: Constructed strings only allowed for >1000 byte in CER encoding: cb=%#x uTag=%#x fClass=%#x",
pszErrorTag, pThis->Asn1Core.cb,
pThis->Asn1Core.uTag, pThis->Asn1Core.fClass);
}
/** @todo implement constructed strings. */
if (RT_SUCCESS(rc))
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CONSTRUCTED_STRING_NOT_IMPL,
"%s: Support for constructed strings is not implemented", pszErrorTag);
}
else
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_TAG_FLAG_CLASS_MISMATCH,
"%s: Not a valid string object: fClass=%#x / uTag=%#x",
pszErrorTag, pThis->Asn1Core.fClass, pThis->Asn1Core.uTag);
}
}
RT_ZERO(*pThis);
return rc;
}
/**
* Common worker for the specific string type getters.
*
* @returns IPRT status code
* @param pCursor The cursor.
* @param fFlags The RTASN1CURSOR_GET_F_XXX flags.
* @param uTag The string tag.
* @param pThis The output object.
* @param pszErrorTag The error tag.
* @param pszWhat The string type name.
*/
static int rtAsn1XxxString_DecodeAsn1(PRTASN1CURSOR pCursor, uint32_t fFlags, uint8_t uTag, PRTASN1STRING pThis,
const char *pszErrorTag, const char *pszWhat)
{
pThis->cchUtf8 = 0;
pThis->pszUtf8 = NULL;
int rc = RTAsn1CursorReadHdr(pCursor, &pThis->Asn1Core, pszErrorTag);
if (RT_SUCCESS(rc))
{
rc = RTAsn1CursorMatchTagClassFlagsString(pCursor, &pThis->Asn1Core, uTag,
ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_PRIMITIVE,
fFlags, pszErrorTag, pszWhat);
if (RT_SUCCESS(rc))
{
if (!(pThis->Asn1Core.fClass & ASN1_TAGFLAG_CONSTRUCTED))
{
RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
pThis->Asn1Core.pOps = &g_RTAsn1String_Vtable;
pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
RTAsn1CursorInitAllocation(pCursor, &pThis->Allocation);
/* UTF-8 conversion is done lazily, upon request. */
return VINF_SUCCESS;
}
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CONSTRUCTED_STRING_NOT_IMPL,
"%s: Constructed %s not implemented.", pszErrorTag, pszWhat);
}
}
RT_ZERO(*pThis);
return rc;
}
/*
* Generate code for the tag specific decoders.
*/
#define RTASN1STRING_IMPL(a_uTag, a_szTag, a_Api) \
RTDECL(int) RT_CONCAT(a_Api,_DecodeAsn1)(PRTASN1CURSOR pCursor, uint32_t fFlags, \
PRTASN1STRING pThis, const char *pszErrorTag) \
{ \
return rtAsn1XxxString_DecodeAsn1(pCursor, fFlags, a_uTag, pThis, pszErrorTag, a_szTag); \
}
#include "asn1-ut-string-template2.h"
/*
* Generate code for the associated collection types.
*/
#define RTASN1TMPL_TEMPLATE_FILE "../common/asn1/asn1-ut-string-template.h"
#include <iprt/asn1-generator-internal-header.h>
#include <iprt/asn1-generator-asn1-decoder.h>
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