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crypt32: Decode enhanced key usages using CRYPT_AsnDecodeArrayNoAlloc.

This commit is contained in:
Juan Lang 2009-10-14 13:06:47 -07:00 committed by Alexandre Julliard
parent 36fc7b06b1
commit b1a1b32b59
1 changed files with 22 additions and 175 deletions
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197
dlls/crypt32/decode.c
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@ -58,12 +58,6 @@
WINE_DEFAULT_DEBUG_CHANNEL(cryptasn);
WINE_DECLARE_DEBUG_CHANNEL(crypt);
struct GenericArray
{
DWORD cItems;
BYTE *rgItems;
};
typedef BOOL (WINAPI *CryptDecodeObjectFunc)(DWORD, LPCSTR, const BYTE *,
DWORD, DWORD, void *, DWORD *);
typedef BOOL (WINAPI *CryptDecodeObjectExFunc)(DWORD, LPCSTR, const BYTE *,
@ -605,173 +599,6 @@ struct AsnArrayItemSize
DWORD size;
};
/* Decodes an array of like types into a struct GenericArray.
* The layout and decoding of the array are described by a struct
* AsnArrayDescriptor.
*/
static BOOL CRYPT_AsnDecodeArray(const struct AsnArrayDescriptor *arrayDesc,
const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo,
DWORD *pcbDecoded, void *startingPointer)
{
BOOL ret = TRUE;
TRACE("%p, %p, %d, %08x, %p, %p, %d, %p\n", arrayDesc, pbEncoded,
cbEncoded, dwFlags, pDecodePara, pvStructInfo, *pcbStructInfo,
startingPointer);
if (!cbEncoded)
{
SetLastError(CRYPT_E_ASN1_EOD);
ret = FALSE;
}
else if (!arrayDesc->tag || pbEncoded[0] == arrayDesc->tag)
{
DWORD dataLen;
if ((ret = CRYPT_GetLengthIndefinite(pbEncoded, cbEncoded, &dataLen)))
{
DWORD bytesNeeded, cItems = 0, decoded;
BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
/* There can be arbitrarily many items, but there is often only one.
*/
struct AsnArrayItemSize itemSize = { 0 }, *itemSizes = &itemSize;
decoded = 1 + lenBytes;
bytesNeeded = sizeof(struct GenericArray);
if (dataLen)
{
const BYTE *ptr;
BOOL doneDecoding = FALSE;
for (ptr = pbEncoded + 1 + lenBytes; ret && !doneDecoding; )
{
if (dataLen == CMSG_INDEFINITE_LENGTH)
{
if (ptr[0] == 0)
{
doneDecoding = TRUE;
if (ptr[1] != 0)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
else
decoded += 2;
}
}
else if (ptr - pbEncoded - 1 - lenBytes >= dataLen)
doneDecoding = TRUE;
if (!doneDecoding)
{
DWORD itemEncoded, itemDataLen, itemDecoded, size = 0;
/* Each item decoded may not tolerate extraneous bytes,
* so get the length of the next element if known.
*/
if ((ret = CRYPT_GetLengthIndefinite(ptr,
cbEncoded - (ptr - pbEncoded), &itemDataLen)))
{
if (itemDataLen == CMSG_INDEFINITE_LENGTH)
itemEncoded = cbEncoded - (ptr - pbEncoded);
else
itemEncoded = 1 + GET_LEN_BYTES(ptr[1]) +
itemDataLen;
}
if (ret)
ret = arrayDesc->decodeFunc(ptr, itemEncoded,
dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, &size,
&itemDecoded);
if (ret)
{
cItems++;
if (itemSizes != &itemSize)
itemSizes = CryptMemRealloc(itemSizes,
cItems * sizeof(struct AsnArrayItemSize));
else if (cItems > 1)
{
itemSizes =
CryptMemAlloc(
cItems * sizeof(struct AsnArrayItemSize));
if (itemSizes)
memcpy(itemSizes, &itemSize,
sizeof(itemSize));
}
if (itemSizes)
{
decoded += itemDecoded;
itemSizes[cItems - 1].encodedLen = itemEncoded;
itemSizes[cItems - 1].size = size;
bytesNeeded += size;
ptr += itemEncoded;
}
else
ret = FALSE;
}
}
}
}
if (ret)
{
if (pcbDecoded)
*pcbDecoded = decoded;
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, bytesNeeded)))
{
DWORD i;
BYTE *nextData;
const BYTE *ptr;
struct GenericArray *array;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
array = pvStructInfo;
array->cItems = cItems;
if (startingPointer)
array->rgItems = startingPointer;
else
array->rgItems = (BYTE *)array +
sizeof(struct GenericArray);
nextData = array->rgItems +
array->cItems * arrayDesc->itemSize;
for (i = 0, ptr = pbEncoded + 1 + lenBytes; ret &&
i < cItems && ptr - pbEncoded - 1 - lenBytes <
dataLen; i++)
{
DWORD itemDecoded;
if (arrayDesc->hasPointer)
*(BYTE **)(array->rgItems + i * arrayDesc->itemSize
+ arrayDesc->pointerOffset) = nextData;
ret = arrayDesc->decodeFunc(ptr,
itemSizes[i].encodedLen,
dwFlags & ~CRYPT_DECODE_ALLOC_FLAG,
array->rgItems + i * arrayDesc->itemSize,
&itemSizes[i].size, &itemDecoded);
if (ret)
{
nextData += itemSizes[i].size - arrayDesc->itemSize;
ptr += itemDecoded;
}
}
if (!ret && (dwFlags & CRYPT_DECODE_ALLOC_FLAG))
CRYPT_FreeSpace(pDecodePara, pvStructInfo);
}
}
if (itemSizes != &itemSize)
CryptMemFree(itemSizes);
}
}
else
{
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
}
return ret;
}
/* Decodes an array of like types into a structure described by a struct
* AsnArrayDescriptor. Doesn't allocate memory for the decoded items,
* leaves that up to the caller.
@ -5128,9 +4955,29 @@ static BOOL WINAPI CRYPT_AsnDecodeEnhancedKeyUsage(DWORD dwCertEncodingType,
offsetof(CERT_ENHKEY_USAGE, rgpszUsageIdentifier),
sizeof(CERT_ENHKEY_USAGE),
CRYPT_AsnDecodeOidInternal, sizeof(LPSTR), TRUE, 0 };
DWORD bytesNeeded;
ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, NULL, NULL);
ret = CRYPT_AsnDecodeArrayNoAlloc(&arrayDesc, pbEncoded, cbEncoded,
dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, &bytesNeeded, NULL);
if (ret)
{
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
pvStructInfo, pcbStructInfo, bytesNeeded)))
{
CERT_ENHKEY_USAGE *usage;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
usage = pvStructInfo;
usage->rgpszUsageIdentifier = (LPSTR *)
((BYTE *)pvStructInfo + sizeof(CERT_ENHKEY_USAGE));
ret = CRYPT_AsnDecodeArrayNoAlloc(&arrayDesc,
pbEncoded, cbEncoded, dwFlags & ~CRYPT_DECODE_ALLOC_FLAG,
&usage->cUsageIdentifier, pcbStructInfo, NULL);
}
}
}
__EXCEPT_PAGE_FAULT
{