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wintrust: Implement decoding SPC links.

This commit is contained in:
Juan Lang 2007-08-10 11:23:55 -07:00 committed by Alexandre Julliard
parent 44047e02c2
commit 29cae46fce
3 changed files with 348 additions and 13 deletions
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2
dlls/wintrust/Makefile.in
View File

@ -4,7 +4,7 @@ SRCDIR = @srcdir@
VPATH = @srcdir@
MODULE = wintrust.dll
IMPORTLIB = libwintrust.$(IMPLIBEXT)
IMPORTS = crypt32 user32 advapi32 kernel32
IMPORTS = crypt32 user32 advapi32 kernel32 ntdll
DELAYIMPORTS = imagehlp
C_SRCS = \

347
dlls/wintrust/asn.c
View File

@ -18,16 +18,32 @@
*
*/
#include <stdarg.h>
#include <assert.h>
#define NONAMELESSUNION
#include "windef.h"
#include "winbase.h"
#include "winerror.h"
#include "wincrypt.h"
#include "wintrust.h"
#include "snmp.h"
#include "winternl.h"
#include "wine/debug.h"
#include "wine/exception.h"
WINE_DEFAULT_DEBUG_CHANNEL(cryptasn);
#ifdef WORDS_BIGENDIAN
#define hton16(x) (x)
#define n16toh(x) (x)
#else
#define hton16(x) RtlUshortByteSwap(x)
#define n16toh(x) RtlUshortByteSwap(x)
#endif
BOOL WINAPI WVTAsn1SpcLinkEncode(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, BYTE *pbEncoded,
DWORD *pcbEncoded)
@ -48,14 +64,337 @@ BOOL WINAPI WVTAsn1SpcPeImageDataEncode(DWORD dwCertEncodingType,
return FALSE;
}
/* Gets the number of length bytes from the given (leading) length byte */
#define GET_LEN_BYTES(b) ((b) <= 0x7f ? 1 : 1 + ((b) & 0x7f))
/* Helper function to get the encoded length of the data starting at pbEncoded,
* where pbEncoded[0] is the tag. If the data are too short to contain a
* length or if the length is too large for cbEncoded, sets an appropriate
* error code and returns FALSE.
*/
static BOOL CRYPT_GetLen(const BYTE *pbEncoded, DWORD cbEncoded, DWORD *len)
{
BOOL ret;
if (cbEncoded <= 1)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
else if (pbEncoded[1] <= 0x7f)
{
if (pbEncoded[1] + 1 > cbEncoded)
{
SetLastError(CRYPT_E_ASN1_EOD);
ret = FALSE;
}
else
{
*len = pbEncoded[1];
ret = TRUE;
}
}
else if (pbEncoded[1] == 0x80)
{
FIXME("unimplemented for indefinite-length encoding\n");
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
else
{
BYTE lenLen = GET_LEN_BYTES(pbEncoded[1]);
if (lenLen > sizeof(DWORD) + 1)
{
SetLastError(CRYPT_E_ASN1_LARGE);
ret = FALSE;
}
else if (lenLen + 2 > cbEncoded)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
else
{
DWORD out = 0;
pbEncoded += 2;
while (--lenLen)
{
out <<= 8;
out |= *pbEncoded++;
}
if (out + lenLen + 1 > cbEncoded)
{
SetLastError(CRYPT_E_ASN1_EOD);
ret = FALSE;
}
else
{
*len = out;
ret = TRUE;
}
}
}
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeOctets(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
DWORD bytesNeeded, dataLen;
TRACE("%p, %d, %08x, %p, %d\n", pbEncoded, cbEncoded, dwFlags,
pvStructInfo, *pcbStructInfo);
if (!cbEncoded)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
else if (pbEncoded[0] != ASN_OCTETSTRING)
{
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
}
else if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
bytesNeeded = sizeof(CRYPT_DATA_BLOB);
else
bytesNeeded = dataLen + sizeof(CRYPT_DATA_BLOB);
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
SetLastError(ERROR_MORE_DATA);
*pcbStructInfo = bytesNeeded;
ret = FALSE;
}
else
{
CRYPT_DATA_BLOB *blob;
BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
blob = (CRYPT_DATA_BLOB *)pvStructInfo;
blob->cbData = dataLen;
if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
blob->pbData = (BYTE *)pbEncoded + 1 + lenBytes;
else
{
assert(blob->pbData);
if (blob->cbData)
memcpy(blob->pbData, pbEncoded + 1 + lenBytes,
blob->cbData);
}
}
}
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeSPCLinkInternal(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = FALSE;
DWORD bytesNeeded = sizeof(SPC_LINK), dataLen;
TRACE("%p, %d, %08x, %p, %d\n", pbEncoded, cbEncoded, dwFlags,
pvStructInfo, *pcbStructInfo);
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
DWORD realDataLen;
switch (pbEncoded[0])
{
case ASN_CONTEXT:
bytesNeeded += (dataLen + 1) * sizeof(WCHAR);
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
*pcbStructInfo = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
PSPC_LINK link = (PSPC_LINK)pvStructInfo;
DWORD i;
link->dwLinkChoice = SPC_URL_LINK_CHOICE;
for (i = 0; i < dataLen; i++)
link->u.pwszUrl[i] =
*(pbEncoded + 1 + lenBytes + i);
link->u.pwszUrl[i] = '\0';
TRACE("returning url %s\n", debugstr_w(link->u.pwszUrl));
}
break;
case ASN_CONSTRUCTOR | ASN_CONTEXT | 1:
{
CRYPT_DATA_BLOB classId;
DWORD size = sizeof(classId);
if ((ret = CRYPT_AsnDecodeOctets(dwCertEncodingType, NULL,
pbEncoded + 1 + lenBytes, cbEncoded - 1 - lenBytes,
CRYPT_DECODE_NOCOPY_FLAG, &classId, &size)))
{
if (classId.cbData != sizeof(SPC_UUID))
{
SetLastError(CRYPT_E_BAD_ENCODE);
ret = FALSE;
}
else
{
CRYPT_DATA_BLOB data;
/* The tag length for the classId must be 1 since the
* length is correct.
*/
size = sizeof(data);
if ((ret = CRYPT_AsnDecodeOctets(dwCertEncodingType, NULL,
pbEncoded + 3 + lenBytes + classId.cbData,
cbEncoded - 3 - lenBytes - classId.cbData,
CRYPT_DECODE_NOCOPY_FLAG, &data, &size)))
{
bytesNeeded += data.cbData;
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
*pcbStructInfo = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
PSPC_LINK link = (PSPC_LINK)pvStructInfo;
link->dwLinkChoice = SPC_MONIKER_LINK_CHOICE;
/* pwszFile pointer was set by caller, copy it
* before overwriting it
*/
link->u.Moniker.SerializedData.pbData =
(BYTE *)link->u.pwszFile;
memcpy(&link->u.Moniker.ClassId, classId.pbData,
classId.cbData);
memcpy(link->u.Moniker.SerializedData.pbData,
data.pbData, data.cbData);
link->u.Moniker.SerializedData.cbData = data.cbData;
}
}
}
}
break;
}
case ASN_CONSTRUCTOR | ASN_CONTEXT | 2:
if (dataLen && pbEncoded[1 + lenBytes] != ASN_CONTEXT)
SetLastError(CRYPT_E_ASN1_BADTAG);
else if ((ret = CRYPT_GetLen(pbEncoded + 1 + lenBytes, dataLen,
&realDataLen)))
{
BYTE realLenBytes = GET_LEN_BYTES(pbEncoded[2 + lenBytes]);
bytesNeeded += realDataLen + sizeof(WCHAR);
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
*pcbStructInfo = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
PSPC_LINK link = (PSPC_LINK)pvStructInfo;
DWORD i;
const BYTE *ptr = pbEncoded + 2 + lenBytes + realLenBytes;
link->dwLinkChoice = SPC_FILE_LINK_CHOICE;
for (i = 0; i < dataLen / sizeof(WCHAR); i++)
link->u.pwszFile[i] =
hton16(*(WORD *)(ptr + i * sizeof(WCHAR)));
link->u.pwszFile[realDataLen / sizeof(WCHAR)] = '\0';
TRACE("returning file %s\n", debugstr_w(link->u.pwszFile));
}
}
else
{
bytesNeeded += sizeof(WCHAR);
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
*pcbStructInfo = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
PSPC_LINK link = (PSPC_LINK)pvStructInfo;
link->dwLinkChoice = SPC_FILE_LINK_CHOICE;
link->u.pwszFile[0] = '\0';
ret = TRUE;
}
}
break;
default:
SetLastError(CRYPT_E_ASN1_BADTAG);
}
}
TRACE("returning %d\n", ret);
return ret;
}
BOOL WINAPI WVTAsn1SpcLinkDecode(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
void *pvStructInfo, DWORD *pcbStructInfo)
{
FIXME("(0x%08x, %s, %p, %d, 0x%08x, %p, %p)\n", dwCertEncodingType,
debugstr_a(lpszStructType), pbEncoded, cbEncoded, dwFlags,
pvStructInfo, pcbStructInfo);
return FALSE;
BOOL ret = FALSE;
TRACE("%p, %d, %08x, %p, %d\n", pbEncoded, cbEncoded, dwFlags,
pvStructInfo, *pcbStructInfo);
__TRY
{
DWORD bytesNeeded;
ret = CRYPT_AsnDecodeSPCLinkInternal(dwCertEncodingType,
lpszStructType, pbEncoded, cbEncoded, dwFlags, NULL, &bytesNeeded);
if (ret)
{
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
*pcbStructInfo = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
SPC_LINK *link = (SPC_LINK *)pvStructInfo;
link->u.pwszFile =
(LPWSTR)((BYTE *)pvStructInfo + sizeof(SPC_LINK));
ret = CRYPT_AsnDecodeSPCLinkInternal(dwCertEncodingType,
lpszStructType, pbEncoded, cbEncoded, dwFlags, pvStructInfo,
pcbStructInfo);
}
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
}
__ENDTRY
TRACE("returning %d\n", ret);
return ret;
}
BOOL WINAPI WVTAsn1SpcPeImageDataDecode(DWORD dwCertEncodingType,

12
dlls/wintrust/tests/asn.c
View File

@ -147,7 +147,6 @@ static void test_decodeSPCLink(void)
ret = CryptDecodeObjectEx(X509_ASN_ENCODING, SPC_LINK_STRUCT,
emptyURLSPCLink, sizeof(emptyURLSPCLink), CRYPT_DECODE_ALLOC_FLAG, NULL,
(BYTE *)&buf, &size);
todo_wine
ok(ret, "CryptDecodeObjectEx failed: %08x\n", GetLastError());
if (ret)
{
@ -160,7 +159,6 @@ static void test_decodeSPCLink(void)
ret = CryptDecodeObjectEx(X509_ASN_ENCODING, SPC_LINK_STRUCT,
urlSPCLink, sizeof(urlSPCLink), CRYPT_DECODE_ALLOC_FLAG, NULL,
(BYTE *)&buf, &size);
todo_wine
ok(ret, "CryptDecodeObjectEx failed: %08x\n", GetLastError());
if (ret)
{
@ -173,7 +171,6 @@ static void test_decodeSPCLink(void)
ret = CryptDecodeObjectEx(X509_ASN_ENCODING, SPC_LINK_STRUCT,
fileSPCLink, sizeof(fileSPCLink), CRYPT_DECODE_ALLOC_FLAG, NULL,
(BYTE *)&buf, &size);
todo_wine
ok(ret, "CryptDecodeObjectEx failed: %08x\n", GetLastError());
if (ret)
{
@ -186,7 +183,6 @@ static void test_decodeSPCLink(void)
ret = CryptDecodeObjectEx(X509_ASN_ENCODING, SPC_LINK_STRUCT,
emptyMonikerSPCLink, sizeof(emptyMonikerSPCLink), CRYPT_DECODE_ALLOC_FLAG,
NULL, (BYTE *)&buf, &size);
todo_wine
ok(ret, "CryptDecodeObjectEx failed: %08x\n", GetLastError());
if (ret)
{
@ -195,14 +191,15 @@ static void test_decodeSPCLink(void)
link = (SPC_LINK *)buf;
ok(link->dwLinkChoice == SPC_MONIKER_LINK_CHOICE,
"Expected SPC_MONIKER_LINK_CHOICE, got %d\n", link->dwLinkChoice);
ok(!memcmp(&link->Moniker, &emptyMoniker, sizeof(emptyMoniker)),
"Unexpected value\n");
ok(!memcmp(&link->Moniker.ClassId, &emptyMoniker.ClassId,
sizeof(emptyMoniker.ClassId)), "Unexpected value\n");
ok(link->Moniker.SerializedData.cbData == 0,
"Expected no serialized data\n");
LocalFree(buf);
}
ret = CryptDecodeObjectEx(X509_ASN_ENCODING, SPC_LINK_STRUCT,
monikerSPCLink, sizeof(monikerSPCLink), CRYPT_DECODE_ALLOC_FLAG, NULL,
(BYTE *)&buf, &size);
todo_wine
ok(ret, "CryptDecodeObjectEx failed: %08x\n", GetLastError());
if (ret)
{
@ -224,7 +221,6 @@ static void test_decodeSPCLink(void)
ret = CryptDecodeObjectEx(X509_ASN_ENCODING, SPC_LINK_STRUCT,
badMonikerSPCLink, sizeof(badMonikerSPCLink), CRYPT_DECODE_ALLOC_FLAG,
NULL, (BYTE *)&buf, &size);
todo_wine
ok(!ret && GetLastError() == CRYPT_E_BAD_ENCODE,
"Expected CRYPT_E_BAD_ENCODE, got %08x\n", GetLastError());
}