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Shipwright/StormLib/src/SFileVerify.cpp

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/*****************************************************************************/
/* SFileVerify.cpp Copyright (c) Ladislav Zezula 2010 */
/*---------------------------------------------------------------------------*/
/* MPQ files and MPQ archives verification. */
/* */
/* The MPQ signature verification has been written by Jean-Francois Roy */
/* <bahamut@macstorm.org> and Justin Olbrantz (Quantam). */
/* The MPQ public keys have been created by MPQKit, using OpenSSL library. */
/* */
/*---------------------------------------------------------------------------*/
/* Date Ver Who Comment */
/* -------- ---- --- ------- */
/* 04.05.10 1.00 Lad The first version of SFileVerify.cpp */
/*****************************************************************************/
#define __STORMLIB_SELF__
#include "StormLib.h"
#include "StormCommon.h"
//-----------------------------------------------------------------------------
// Local defines
#define MPQ_DIGEST_UNIT_SIZE 0x10000
//-----------------------------------------------------------------------------
// Known Blizzard public keys
// Created by Jean-Francois Roy using OpenSSL
static const char * szBlizzardWeakPrivateKey =
"-----BEGIN PRIVATE KEY-----"
"MIIBOQIBAAJBAJJidwS/uILMBSO5DLGsBFknIXWWjQJe2kfdfEk3G/j66w4KkhZ1"
"V61Rt4zLaMVCYpDun7FLwRjkMDSepO1q2DcCAwEAAQJANtiztVDMJh2hE1hjPDKy"
"UmEJ9U/aN3gomuKOjbQbQ/bWWcM/WfhSVHmPqtqh/bQI2UXFr0rnXngeteZHLr/b"
"8QIhAMuWriSKGMACw18/rVVfUrThs915odKBH1Alr3vMVVzZAiEAuBHPSQkgwcb6"
"L4MWaiKuOzq08mSyNqPeN8oSy18q848CIHeMn+3s+eOmu7su1UYQl6yH7OrdBd1q"
"3UxfFNEJiAbhAiAqxdCyOxHGlbM7aS3DOg3cq5ayoN2cvtV7h1R4t8OmVwIgF+5z"
"/6vkzBUsZhd8Nwyis+MeQYH0rpFpMKdTlqmPF2Q="
"-----END PRIVATE KEY-----";
static const char * szBlizzardWeakPublicKey =
"-----BEGIN PUBLIC KEY-----"
"MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAJJidwS/uILMBSO5DLGsBFknIXWWjQJe"
"2kfdfEk3G/j66w4KkhZ1V61Rt4zLaMVCYpDun7FLwRjkMDSepO1q2DcCAwEAAQ=="
"-----END PUBLIC KEY-----";
static const char * szBlizzardStrongPublicKey =
"-----BEGIN PUBLIC KEY-----"
"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsQZ+ziT2h8h+J/iMQpgd"
"tH1HaJzOBE3agjU4yMPcrixaPOZoA4t8bwfey7qczfWywocYo3pleytFF+IuD4HD"
"Fl9OXN1SFyupSgMx1EGZlgbFAomnbq9MQJyMqQtMhRAjFgg4TndS7YNb+JMSAEKp"
"kXNqY28n/EVBHD5TsMuVCL579gIenbr61dI92DDEdy790IzIG0VKWLh/KOTcTJfm"
"Ds/7HQTkGouVW+WUsfekuqNQo7ND9DBnhLjLjptxeFE2AZqYcA1ao3S9LN3GL1tW"
"lVXFIX9c7fWqaVTQlZ2oNsI/ARVApOK3grNgqvwH6YoVYVXjNJEo5sQJsPsdV/hk"
"dwIDAQAB"
"-----END PUBLIC KEY-----";
static const char * szWarcraft3MapPublicKey =
"-----BEGIN PUBLIC KEY-----"
"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA1BwklUUQ3UvjizOBRoF5"
"yyOVc7KD+oGOQH5i6eUk1yfs0luCC70kNucNrfqhmviywVtahRse1JtXCPrx2bd3"
"iN8Dx91fbkxjYIOGTsjYoHKTp0BbaFkJih776fcHgnFSb+7mJcDuJVvJOXxEH6w0"
"1vo6VtujCqj1arqbyoal+xtAaczF3us5cOEp45sR1zAWTn1+7omN7VWV4QqJPaDS"
"gBSESc0l1grO0i1VUSumayk7yBKIkb+LBvcG6WnYZHCi7VdLmaxER5m8oZfER66b"
"heHoiSQIZf9PAY6Guw2DT5BTc54j/AaLQAKf2qcRSgQLVo5kQaddF3rCpsXoB/74"
"6QIDAQAB"
"-----END PUBLIC KEY-----";
static const char * szWowPatchPublicKey =
"-----BEGIN PUBLIC KEY-----"
"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwOsMV0LagAWPEtEQM6b9"
"6FHFkUyGbbyda2/Dfc9dyl21E9QvX+Yw7qKRMAKPzA2TlQQLZKvXpnKXF/YIK5xa"
"5uwg9CEHCEAYolLG4xn0FUOE0E/0PuuytI0p0ICe6rk00PifZzTr8na2wI/l/GnQ"
"bvnIVF1ck6cslATpQJ5JJVMXzoFlUABS19WESw4MXuJAS3AbMhxNWdEhVv7eO51c"
"yGjRLy9QjogZODZTY0fSEksgBqQxNCoYVJYI/sF5K2flDsGqrIp0OdJ6teJlzg1Y"
"UjYnb6bKjlidXoHEXI2TgA/mD6O3XFIt08I9s3crOCTgICq7cgX35qrZiIVWZdRv"
"TwIDAQAB"
"-----END PUBLIC KEY-----";
static const char * szWowSurveyPublicKey =
"-----BEGIN PUBLIC KEY-----"
"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAnIt1DR6nRyyKsy2qahHe"
"MKLtacatn/KxieHcwH87wLBxKy+jZ0gycTmJ7SaTdBAEMDs/V5IPIXEtoqYnid2c"
"63TmfGDU92oc3Ph1PWUZ2PWxBhT06HYxRdbrgHw9/I29pNPi/607x+lzPORITOgU"
"BR6MR8au8HsQP4bn4vkJNgnSgojh48/XQOB/cAln7As1neP61NmVimoLR4Bwi3zt"
"zfgrZaUpyeNCUrOYJmH09YIjbBySTtXOUidoPHjFrMsCWpr6xs8xbETbs7MJFL6a"
"vcUfTT67qfIZ9RsuKfnXJTIrV0kwDSjjuNXiPTmWAehSsiHIsrUXX5RNcwsSjClr"
"nQIDAQAB"
"-----END PUBLIC KEY-----";
static const char * szStarcraft2MapPublicKey =
"-----BEGIN PUBLIC KEY-----"
"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAmk4GT8zb+ICC25a17KZB"
"q/ygKGJ2VSO6IT5PGHJlm1KfnHBA4B6SH3xMlJ4c6eG2k7QevZv+FOhjsAHubyWq"
"2VKqWbrIFKv2ILc2RfMn8J9EDVRxvcxh6slRrVL69D0w1tfVGjMiKq2Fym5yGoRT"
"E7CRgDqbAbXP9LBsCNWHiJLwfxMGzHbk8pIl9oia5pvM7ofZamSHchxlpy6xa4GJ"
"7xKN01YCNvklTL1D7uol3wkwcHc7vrF8QwuJizuA5bSg4poEGtH62BZOYi+UL/z0"
"31YK+k9CbQyM0X0pJoJoYz1TK+Y5J7vBnXCZtfcTYQ/ZzN6UcxTa57dJaiOlCh9z"
"nQIDAQAB"
"-----END PUBLIC KEY-----";
//-----------------------------------------------------------------------------
// Local functions
static void memrev(unsigned char *buf, size_t count)
{
unsigned char *r;
for (r = buf + count - 1; buf < r; buf++, r--)
{
*buf ^= *r;
*r ^= *buf;
*buf ^= *r;
}
}
static bool decode_base64_key(const char * szKeyBase64, rsa_key * key)
{
unsigned char decoded_key[0x200];
const char * szBase64Begin;
const char * szBase64End;
unsigned long decoded_length = sizeof(decoded_key);
unsigned long length;
// Find out the begin of the BASE64 data
szBase64Begin = szKeyBase64 + strlen("-----BEGIN PUBLIC KEY-----");
szBase64End = szBase64Begin + strlen(szBase64Begin) - strlen("-----END PUBLIC KEY-----");
if(szBase64End[0] != '-')
return false;
// decode the base64 string
length = (unsigned long)(szBase64End - szBase64Begin);
if(base64_decode((unsigned char *)szBase64Begin, length, decoded_key, &decoded_length) != CRYPT_OK)
return false;
// Create RSA key
if(rsa_import(decoded_key, decoded_length, key) != CRYPT_OK)
return false;
return true;
}
static void GetPlainAnsiFileName(
const TCHAR * szFileName,
char * szPlainName)
{
const TCHAR * szPlainNameT = GetPlainFileName(szFileName);
// Convert the plain name to ANSI
while(*szPlainNameT != 0)
*szPlainName++ = (char)*szPlainNameT++;
*szPlainName = 0;
}
// Calculate begin and end of the MPQ archive
static void CalculateArchiveRange(
TMPQArchive * ha,
PMPQ_SIGNATURE_INFO pSI)
{
ULONGLONG TempPos = 0;
char szMapHeader[0x200];
// Get the MPQ begin
pSI->BeginMpqData = ha->MpqPos;
// Warcraft III maps are signed from the map header to the end
if(FileStream_Read(ha->pStream, &TempPos, szMapHeader, sizeof(szMapHeader)))
{
// Is it a map header ?
if(szMapHeader[0] == 'H' && szMapHeader[1] == 'M' && szMapHeader[2] == '3' && szMapHeader[3] == 'W')
{
// We will have to hash since the map header
pSI->BeginMpqData = 0;
}
}
// Get the MPQ data end. This is stored in the MPQ header
pSI->EndMpqData = ha->MpqPos + ha->pHeader->ArchiveSize64;
// Get the size of the entire file
FileStream_GetSize(ha->pStream, &pSI->EndOfFile);
}
static bool CalculateMpqHashMd5(
TMPQArchive * ha,
PMPQ_SIGNATURE_INFO pSI,
LPBYTE pMd5Digest)
{
hash_state md5_state;
ULONGLONG BeginBuffer;
ULONGLONG EndBuffer;
LPBYTE pbDigestBuffer = NULL;
// Allocate buffer for creating the MPQ digest.
pbDigestBuffer = STORM_ALLOC(BYTE, MPQ_DIGEST_UNIT_SIZE);
if(pbDigestBuffer == NULL)
return false;
// Initialize the MD5 hash state
md5_init(&md5_state);
// Set the byte offset of begin of the data
BeginBuffer = pSI->BeginMpqData;
// Create the digest
for(;;)
{
ULONGLONG BytesRemaining;
LPBYTE pbSigBegin = NULL;
LPBYTE pbSigEnd = NULL;
DWORD dwToRead = MPQ_DIGEST_UNIT_SIZE;
// Check the number of bytes remaining
BytesRemaining = pSI->EndMpqData - BeginBuffer;
if(BytesRemaining < MPQ_DIGEST_UNIT_SIZE)
dwToRead = (DWORD)BytesRemaining;
if(dwToRead == 0)
break;
// Read the next chunk
if(!FileStream_Read(ha->pStream, &BeginBuffer, pbDigestBuffer, dwToRead))
{
STORM_FREE(pbDigestBuffer);
return false;
}
// Move the current byte offset
EndBuffer = BeginBuffer + dwToRead;
// Check if the signature is within the loaded digest
if(BeginBuffer <= pSI->BeginExclude && pSI->BeginExclude < EndBuffer)
pbSigBegin = pbDigestBuffer + (size_t)(pSI->BeginExclude - BeginBuffer);
if(BeginBuffer <= pSI->EndExclude && pSI->EndExclude < EndBuffer)
pbSigEnd = pbDigestBuffer + (size_t)(pSI->EndExclude - BeginBuffer);
// Zero the part that belongs to the signature
if(pbSigBegin != NULL || pbSigEnd != NULL)
{
if(pbSigBegin == NULL)
pbSigBegin = pbDigestBuffer;
if(pbSigEnd == NULL)
pbSigEnd = pbDigestBuffer + dwToRead;
memset(pbSigBegin, 0, (pbSigEnd - pbSigBegin));
}
// Pass the buffer to the hashing function
md5_process(&md5_state, pbDigestBuffer, dwToRead);
// Move pointers
BeginBuffer += dwToRead;
}
// Finalize the MD5 hash
md5_done(&md5_state, pMd5Digest);
STORM_FREE(pbDigestBuffer);
return true;
}
static void AddTailToSha1(
hash_state * psha1_state,
const char * szTail)
{
unsigned char * pbTail = (unsigned char *)szTail;
unsigned char szUpperCase[0x200];
unsigned long nLength = 0;
// Convert the tail to uppercase
// Note that we don't need to terminate the string with zero
while(*pbTail != 0)
{
szUpperCase[nLength++] = AsciiToUpperTable[*pbTail++];
}
// Append the tail to the SHA1
sha1_process(psha1_state, szUpperCase, nLength);
}
static bool CalculateMpqHashSha1(
TMPQArchive * ha,
PMPQ_SIGNATURE_INFO pSI,
unsigned char * sha1_tail0,
unsigned char * sha1_tail1,
unsigned char * sha1_tail2)
{
ULONGLONG BeginBuffer;
hash_state sha1_state_temp;
hash_state sha1_state;
LPBYTE pbDigestBuffer = NULL;
char szPlainName[MAX_PATH];
// Allocate buffer for creating the MPQ digest.
pbDigestBuffer = STORM_ALLOC(BYTE, MPQ_DIGEST_UNIT_SIZE);
if(pbDigestBuffer == NULL)
return false;
// Initialize SHA1 state structure
sha1_init(&sha1_state);
// Calculate begin of data to be hashed
BeginBuffer = pSI->BeginMpqData;
// Create the digest
for(;;)
{
ULONGLONG BytesRemaining;
DWORD dwToRead = MPQ_DIGEST_UNIT_SIZE;
// Check the number of bytes remaining
BytesRemaining = pSI->EndMpqData - BeginBuffer;
if(BytesRemaining < MPQ_DIGEST_UNIT_SIZE)
dwToRead = (DWORD)BytesRemaining;
if(dwToRead == 0)
break;
// Read the next chunk
if(!FileStream_Read(ha->pStream, &BeginBuffer, pbDigestBuffer, dwToRead))
{
STORM_FREE(pbDigestBuffer);
return false;
}
// Pass the buffer to the hashing function
sha1_process(&sha1_state, pbDigestBuffer, dwToRead);
// Move pointers
BeginBuffer += dwToRead;
}
// Add all three known tails and generate three hashes
memcpy(&sha1_state_temp, &sha1_state, sizeof(hash_state));
sha1_done(&sha1_state_temp, sha1_tail0);
memcpy(&sha1_state_temp, &sha1_state, sizeof(hash_state));
GetPlainAnsiFileName(FileStream_GetFileName(ha->pStream), szPlainName);
AddTailToSha1(&sha1_state_temp, szPlainName);
sha1_done(&sha1_state_temp, sha1_tail1);
memcpy(&sha1_state_temp, &sha1_state, sizeof(hash_state));
AddTailToSha1(&sha1_state_temp, "ARCHIVE");
sha1_done(&sha1_state_temp, sha1_tail2);
// Finalize the MD5 hash
STORM_FREE(pbDigestBuffer);
return true;
}
static DWORD VerifyRawMpqData(
TMPQArchive * ha,
ULONGLONG ByteOffset,
DWORD dwDataSize)
{
ULONGLONG DataOffset = ha->MpqPos + ByteOffset;
LPBYTE pbDataChunk;
LPBYTE pbMD5Array1; // Calculated MD5 array
LPBYTE pbMD5Array2; // MD5 array loaded from the MPQ
DWORD dwBytesInChunk;
DWORD dwChunkCount;
DWORD dwChunkSize = ha->pHeader->dwRawChunkSize;
DWORD dwMD5Size;
DWORD dwErrCode = ERROR_SUCCESS;
// Don't verify zero-sized blocks
if(dwDataSize == 0)
return ERROR_SUCCESS;
// Get the number of data chunks to calculate MD5
assert(dwChunkSize != 0);
dwChunkCount = ((dwDataSize - 1) / dwChunkSize) + 1;
dwMD5Size = dwChunkCount * MD5_DIGEST_SIZE;
// Allocate space for data chunk and for the MD5 array
pbDataChunk = STORM_ALLOC(BYTE, dwChunkSize);
if(pbDataChunk == NULL)
return ERROR_NOT_ENOUGH_MEMORY;
// Allocate space for MD5 array
pbMD5Array1 = STORM_ALLOC(BYTE, dwMD5Size);
pbMD5Array2 = STORM_ALLOC(BYTE, dwMD5Size);
if(pbMD5Array1 == NULL || pbMD5Array2 == NULL)
dwErrCode = ERROR_NOT_ENOUGH_MEMORY;
// Calculate MD5 of each data chunk
if(dwErrCode == ERROR_SUCCESS)
{
LPBYTE pbMD5 = pbMD5Array1;
for(DWORD i = 0; i < dwChunkCount; i++)
{
// Get the number of bytes in the chunk
dwBytesInChunk = STORMLIB_MIN(dwChunkSize, dwDataSize);
// Read the data chunk
if(!FileStream_Read(ha->pStream, &DataOffset, pbDataChunk, dwBytesInChunk))
{
dwErrCode = ERROR_FILE_CORRUPT;
break;
}
// Calculate MD5
CalculateDataBlockHash(pbDataChunk, dwBytesInChunk, pbMD5);
// Move pointers and offsets
DataOffset += dwBytesInChunk;
dwDataSize -= dwBytesInChunk;
pbMD5 += MD5_DIGEST_SIZE;
}
}
// Read the MD5 array
if(dwErrCode == ERROR_SUCCESS)
{
// Read the array of MD5
if(!FileStream_Read(ha->pStream, &DataOffset, pbMD5Array2, dwMD5Size))
dwErrCode = GetLastError();
}
// Compare the array of MD5
if(dwErrCode == ERROR_SUCCESS)
{
// Compare the MD5
if(memcmp(pbMD5Array1, pbMD5Array2, dwMD5Size))
dwErrCode = ERROR_FILE_CORRUPT;
}
// Free memory and return result
if(pbMD5Array2 != NULL)
STORM_FREE(pbMD5Array2);
if(pbMD5Array1 != NULL)
STORM_FREE(pbMD5Array1);
if(pbDataChunk != NULL)
STORM_FREE(pbDataChunk);
return dwErrCode;
}
static DWORD VerifyWeakSignature(
TMPQArchive * ha,
PMPQ_SIGNATURE_INFO pSI)
{
BYTE RevSignature[MPQ_WEAK_SIGNATURE_SIZE];
BYTE Md5Digest[MD5_DIGEST_SIZE];
rsa_key key;
int hash_idx = find_hash("md5");
int result = 0;
// The signature might be zeroed out. In that case, we ignore it
if(!IsValidSignature(pSI->Signature))
return ERROR_WEAK_SIGNATURE_OK;
// Calculate hash of the entire archive, skipping the (signature) file
if(!CalculateMpqHashMd5(ha, pSI, Md5Digest))
return ERROR_VERIFY_FAILED;
// Import the Blizzard key in OpenSSL format
if(!decode_base64_key(szBlizzardWeakPublicKey, &key))
return ERROR_VERIFY_FAILED;
// Verify the signature
memcpy(RevSignature, &pSI->Signature[8], MPQ_WEAK_SIGNATURE_SIZE);
memrev(RevSignature, MPQ_WEAK_SIGNATURE_SIZE);
rsa_verify_hash_ex(RevSignature, MPQ_WEAK_SIGNATURE_SIZE, Md5Digest, sizeof(Md5Digest), LTC_LTC_PKCS_1_V1_5, hash_idx, 0, &result, &key);
rsa_free(&key);
// Return the result
return result ? ERROR_WEAK_SIGNATURE_OK : ERROR_WEAK_SIGNATURE_ERROR;
}
static DWORD VerifyStrongSignatureWithKey(
unsigned char * reversed_signature,
unsigned char * padded_digest,
const char * szPublicKey)
{
rsa_key key;
int result = 0;
// Import the Blizzard key in OpenSSL format
if(!decode_base64_key(szPublicKey, &key))
{
assert(false);
return ERROR_VERIFY_FAILED;
}
// Verify the signature
if(rsa_verify_simple(reversed_signature, MPQ_STRONG_SIGNATURE_SIZE, padded_digest, MPQ_STRONG_SIGNATURE_SIZE, &result, &key) != CRYPT_OK)
return ERROR_VERIFY_FAILED;
// Free the key and return result
rsa_free(&key);
return result ? ERROR_STRONG_SIGNATURE_OK : ERROR_STRONG_SIGNATURE_ERROR;
}
static DWORD VerifyStrongSignature(
TMPQArchive * ha,
PMPQ_SIGNATURE_INFO pSI)
{
unsigned char reversed_signature[MPQ_STRONG_SIGNATURE_SIZE];
unsigned char Sha1Digest_tail0[SHA1_DIGEST_SIZE];
unsigned char Sha1Digest_tail1[SHA1_DIGEST_SIZE];
unsigned char Sha1Digest_tail2[SHA1_DIGEST_SIZE];
unsigned char padded_digest[MPQ_STRONG_SIGNATURE_SIZE];
DWORD dwResult;
size_t digest_offset;
// Calculate SHA1 hash of the archive
if(!CalculateMpqHashSha1(ha, pSI, Sha1Digest_tail0, Sha1Digest_tail1, Sha1Digest_tail2))
return ERROR_VERIFY_FAILED;
// Prepare the signature for decryption
memcpy(reversed_signature, &pSI->Signature[4], MPQ_STRONG_SIGNATURE_SIZE);
memrev(reversed_signature, MPQ_STRONG_SIGNATURE_SIZE);
// Prepare the padded digest for comparison
digest_offset = sizeof(padded_digest) - SHA1_DIGEST_SIZE;
memset(padded_digest, 0xbb, digest_offset);
padded_digest[0] = 0x0b;
// Try Blizzard Strong public key with no SHA1 tail
memcpy(padded_digest + digest_offset, Sha1Digest_tail0, SHA1_DIGEST_SIZE);
memrev(padded_digest + digest_offset, SHA1_DIGEST_SIZE);
dwResult = VerifyStrongSignatureWithKey(reversed_signature, padded_digest, szBlizzardStrongPublicKey);
if(dwResult == ERROR_STRONG_SIGNATURE_OK)
return dwResult;
// Try War 3 map public key with plain file name as SHA1 tail
memcpy(padded_digest + digest_offset, Sha1Digest_tail1, SHA1_DIGEST_SIZE);
memrev(padded_digest + digest_offset, SHA1_DIGEST_SIZE);
dwResult = VerifyStrongSignatureWithKey(reversed_signature, padded_digest, szWarcraft3MapPublicKey);
if(dwResult == ERROR_STRONG_SIGNATURE_OK)
return dwResult;
// Try WoW-TBC public key with "ARCHIVE" as SHA1 tail
memcpy(padded_digest + digest_offset, Sha1Digest_tail2, SHA1_DIGEST_SIZE);
memrev(padded_digest + digest_offset, SHA1_DIGEST_SIZE);
dwResult = VerifyStrongSignatureWithKey(reversed_signature, padded_digest, szWowPatchPublicKey);
if(dwResult == ERROR_STRONG_SIGNATURE_OK)
return dwResult;
// Try Survey public key with no SHA1 tail
memcpy(padded_digest + digest_offset, Sha1Digest_tail0, SHA1_DIGEST_SIZE);
memrev(padded_digest + digest_offset, SHA1_DIGEST_SIZE);
dwResult = VerifyStrongSignatureWithKey(reversed_signature, padded_digest, szWowSurveyPublicKey);
if(dwResult == ERROR_STRONG_SIGNATURE_OK)
return dwResult;
// Try Starcraft II public key with no SHA1 tail
memcpy(padded_digest + digest_offset, Sha1Digest_tail0, SHA1_DIGEST_SIZE);
memrev(padded_digest + digest_offset, SHA1_DIGEST_SIZE);
dwResult = VerifyStrongSignatureWithKey(reversed_signature, padded_digest, szStarcraft2MapPublicKey);
if(dwResult == ERROR_STRONG_SIGNATURE_OK)
return dwResult;
return ERROR_STRONG_SIGNATURE_ERROR;
}
static DWORD VerifyFile(
HANDLE hMpq,
const char * szFileName,
LPDWORD pdwCrc32,
char * pMD5,
DWORD dwFlags)
{
hash_state md5_state;
unsigned char * pFileMd5;
unsigned char md5[MD5_DIGEST_SIZE];
TFileEntry * pFileEntry;
TMPQFile * hf;
BYTE Buffer[0x1000];
HANDLE hFile = NULL;
DWORD dwVerifyResult = 0;
DWORD dwTotalBytes = 0;
DWORD dwCrc32 = 0;
//
// Note: When the MPQ is patched, it will
// automatically check the patched version of the file
//
// Make sure the md5 is initialized
memset(md5, 0, sizeof(md5));
// If we have to verify raw data MD5, do it before file open
if(dwFlags & SFILE_VERIFY_RAW_MD5)
{
TMPQArchive * ha = (TMPQArchive *)hMpq;
// Parse the base MPQ and all patches
while(ha != NULL)
{
// Does the archive have support for raw MD5?
if(ha->pHeader->dwRawChunkSize != 0)
{
// The file has raw MD5 if the archive supports it
dwVerifyResult |= VERIFY_FILE_HAS_RAW_MD5;
// Find file entry for the file
pFileEntry = GetFileEntryLocale(ha, szFileName, g_lcFileLocale);
if(pFileEntry != NULL)
{
// If the file's raw MD5 doesn't match, don't bother with more checks
if(VerifyRawMpqData(ha, pFileEntry->ByteOffset, pFileEntry->dwCmpSize) != ERROR_SUCCESS)
return dwVerifyResult | VERIFY_FILE_RAW_MD5_ERROR;
}
}
// Move to the next patch
ha = ha->haPatch;
}
}
// Attempt to open the file
if(SFileOpenFileEx(hMpq, szFileName, SFILE_OPEN_FROM_MPQ, &hFile))
{
// Get the file size
hf = (TMPQFile *)hFile;
pFileEntry = hf->pFileEntry;
dwTotalBytes = SFileGetFileSize(hFile, NULL);
// Initialize the CRC32 and MD5 contexts
md5_init(&md5_state);
dwCrc32 = crc32(0, Z_NULL, 0);
// Also turn on sector checksum verification
if(dwFlags & SFILE_VERIFY_SECTOR_CRC)
hf->bCheckSectorCRCs = true;
// Go through entire file and update both CRC32 and MD5
for(;;)
{
DWORD dwBytesRead = 0;
// Read data from file
SFileReadFile(hFile, Buffer, sizeof(Buffer), &dwBytesRead, NULL);
if(dwBytesRead == 0)
{
if(GetLastError() == ERROR_CHECKSUM_ERROR)
dwVerifyResult |= VERIFY_FILE_SECTOR_CRC_ERROR;
break;
}
// Update CRC32 value
if(dwFlags & SFILE_VERIFY_FILE_CRC)
dwCrc32 = crc32(dwCrc32, Buffer, dwBytesRead);
// Update MD5 value
if(dwFlags & SFILE_VERIFY_FILE_MD5)
md5_process(&md5_state, Buffer, dwBytesRead);
// Decrement the total size
dwTotalBytes -= dwBytesRead;
}
// If the file has sector checksums, indicate it in the flags
if(dwFlags & SFILE_VERIFY_SECTOR_CRC)
{
if((hf->pFileEntry->dwFlags & MPQ_FILE_SECTOR_CRC) && hf->SectorChksums != NULL && hf->SectorChksums[0] != 0)
dwVerifyResult |= VERIFY_FILE_HAS_SECTOR_CRC;
}
// Check if the entire file has been read
// No point in checking CRC32 and MD5 if not
// Skip checksum checks if the file has patches
if(dwTotalBytes == 0)
{
// Check CRC32 and MD5 only if there is no patches
if(hf->hfPatch == NULL)
{
// Check if the CRC32 matches.
if(dwFlags & SFILE_VERIFY_FILE_CRC)
{
// Only check the CRC32 if it is valid
if(pFileEntry->dwCrc32 != 0)
{
dwVerifyResult |= VERIFY_FILE_HAS_CHECKSUM;
if(dwCrc32 != pFileEntry->dwCrc32)
dwVerifyResult |= VERIFY_FILE_CHECKSUM_ERROR;
}
}
// Check if MD5 matches
if(dwFlags & SFILE_VERIFY_FILE_MD5)
{
// Patch files have their MD5 saved in the patch info
pFileMd5 = (hf->pPatchInfo != NULL) ? hf->pPatchInfo->md5 : pFileEntry->md5;
md5_done(&md5_state, md5);
// Only check the MD5 if it is valid
if(IsValidMD5(pFileMd5))
{
dwVerifyResult |= VERIFY_FILE_HAS_MD5;
if(memcmp(md5, pFileMd5, MD5_DIGEST_SIZE))
dwVerifyResult |= VERIFY_FILE_MD5_ERROR;
}
}
}
else
{
// Patched files are MD5-checked automatically
dwVerifyResult |= VERIFY_FILE_HAS_MD5;
}
}
else
{
dwVerifyResult |= VERIFY_READ_ERROR;
}
SFileCloseFile(hFile);
}
else
{
// Remember that the file couldn't be open
dwVerifyResult |= VERIFY_OPEN_ERROR;
}
// If the caller required CRC32 and/or MD5, give it to him
if(pdwCrc32 != NULL)
*pdwCrc32 = dwCrc32;
if(pMD5 != NULL)
memcpy(pMD5, md5, MD5_DIGEST_SIZE);
return dwVerifyResult;
}
// Used in SFileGetFileInfo
bool QueryMpqSignatureInfo(
TMPQArchive * ha,
PMPQ_SIGNATURE_INFO pSI)
{
TFileEntry * pFileEntry;
ULONGLONG ExtraBytes;
DWORD dwFileSize;
// Make sure it's all zeroed
memset(pSI, 0, sizeof(MPQ_SIGNATURE_INFO));
// Calculate the range of the MPQ
CalculateArchiveRange(ha, pSI);
// If there is "(signature)" file in the MPQ, it has a weak signature
pFileEntry = GetFileEntryLocale(ha, SIGNATURE_NAME, LANG_NEUTRAL);
if(pFileEntry != NULL)
{
// Calculate the begin and end of the signature file itself
pSI->BeginExclude = ha->MpqPos + pFileEntry->ByteOffset;
pSI->EndExclude = pSI->BeginExclude + pFileEntry->dwCmpSize;
dwFileSize = (DWORD)(pSI->EndExclude - pSI->BeginExclude);
// Does the signature have proper size?
if(dwFileSize == MPQ_SIGNATURE_FILE_SIZE)
{
// Read the weak signature
if(!FileStream_Read(ha->pStream, &pSI->BeginExclude, pSI->Signature, dwFileSize))
return false;
pSI->SignatureTypes |= SIGNATURE_TYPE_WEAK;
pSI->cbSignatureSize = dwFileSize;
return true;
}
}
// If there is extra bytes beyond the end of the archive,
// it's the strong signature
ExtraBytes = pSI->EndOfFile - pSI->EndMpqData;
if(ExtraBytes >= (MPQ_STRONG_SIGNATURE_SIZE + 4))
{
// Read the strong signature
if(!FileStream_Read(ha->pStream, &pSI->EndMpqData, pSI->Signature, (MPQ_STRONG_SIGNATURE_SIZE + 4)))
return false;
// Check the signature header "NGIS"
if(pSI->Signature[0] != 'N' || pSI->Signature[1] != 'G' || pSI->Signature[2] != 'I' || pSI->Signature[3] != 'S')
return true; //Not a valid signature, but another filetype could've been appended so not always an error.
pSI->SignatureTypes |= SIGNATURE_TYPE_STRONG;
return true;
}
// Succeeded, but no known signature found
return true;
}
//-----------------------------------------------------------------------------
// Support for weak signature
DWORD SSignFileCreate(TMPQArchive * ha)
{
TMPQFile * hf = NULL;
BYTE EmptySignature[MPQ_SIGNATURE_FILE_SIZE];
DWORD dwErrCode = ERROR_SUCCESS;
// Only save the signature if we should do so
if(ha->dwFileFlags3 != 0)
{
// The (signature) file must be non-encrypted and non-compressed
assert(ha->dwFlags & MPQ_FLAG_SIGNATURE_NEW);
assert(ha->dwFileFlags3 == MPQ_FILE_EXISTS);
assert(ha->dwReservedFiles > 0);
// Create the (signature) file file in the MPQ
// Note that the file must not be compressed or encrypted
dwErrCode = SFileAddFile_Init(ha, SIGNATURE_NAME,
0,
sizeof(EmptySignature),
LANG_NEUTRAL,
ha->dwFileFlags3 | MPQ_FILE_REPLACEEXISTING,
&hf);
// Write the empty signature file to the archive
if(dwErrCode == ERROR_SUCCESS)
{
// Write the empty zeroed file to the MPQ
memset(EmptySignature, 0, sizeof(EmptySignature));
dwErrCode = SFileAddFile_Write(hf, EmptySignature, (DWORD)sizeof(EmptySignature), 0);
SFileAddFile_Finish(hf);
// Clear the invalid mark
ha->dwFlags &= ~(MPQ_FLAG_SIGNATURE_NEW | MPQ_FLAG_SIGNATURE_NONE);
ha->dwReservedFiles--;
}
}
return dwErrCode;
}
DWORD SSignFileFinish(TMPQArchive * ha)
{
MPQ_SIGNATURE_INFO si;
unsigned long signature_len = MPQ_WEAK_SIGNATURE_SIZE;
BYTE WeakSignature[MPQ_SIGNATURE_FILE_SIZE];
BYTE Md5Digest[MD5_DIGEST_SIZE];
rsa_key key;
int hash_idx = find_hash("md5");
// Sanity checks
assert((ha->dwFlags & MPQ_FLAG_CHANGED) == 0);
assert(ha->dwFileFlags3 == MPQ_FILE_EXISTS);
// Query the weak signature info
memset(&si, 0, sizeof(MPQ_SIGNATURE_INFO));
if(!QueryMpqSignatureInfo(ha, &si))
return ERROR_FILE_CORRUPT;
// There must be exactly one signature
if(si.SignatureTypes != SIGNATURE_TYPE_WEAK)
return ERROR_FILE_CORRUPT;
// Calculate MD5 of the entire archive
if(!CalculateMpqHashMd5(ha, &si, Md5Digest))
return ERROR_VERIFY_FAILED;
// Decode the private key
if(!decode_base64_key(szBlizzardWeakPrivateKey, &key))
return ERROR_VERIFY_FAILED;
// Sign the hash
memset(WeakSignature, 0, sizeof(WeakSignature));
rsa_sign_hash_ex(Md5Digest, sizeof(Md5Digest), WeakSignature + 8, &signature_len, LTC_LTC_PKCS_1_V1_5, 0, 0, hash_idx, 0, &key);
memrev(WeakSignature + 8, MPQ_WEAK_SIGNATURE_SIZE);
rsa_free(&key);
// Write the signature to the MPQ. Don't use SFile* functions, but write the hash directly
if(!FileStream_Write(ha->pStream, &si.BeginExclude, WeakSignature, MPQ_SIGNATURE_FILE_SIZE))
return GetLastError();
return ERROR_SUCCESS;
}
//-----------------------------------------------------------------------------
// Public (exported) functions
bool WINAPI SFileGetFileChecksums(HANDLE hMpq, const char * szFileName, LPDWORD pdwCrc32, char * pMD5)
{
DWORD dwVerifyResult;
DWORD dwVerifyFlags = 0;
if(pdwCrc32 != NULL)
dwVerifyFlags |= SFILE_VERIFY_FILE_CRC;
if(pMD5 != NULL)
dwVerifyFlags |= SFILE_VERIFY_FILE_MD5;
dwVerifyResult = VerifyFile(hMpq,
szFileName,
pdwCrc32,
pMD5,
dwVerifyFlags);
// If verification failed, return zero
if(dwVerifyResult & VERIFY_FILE_ERROR_MASK)
{
SetLastError(ERROR_FILE_CORRUPT);
return false;
}
return true;
}
DWORD WINAPI SFileVerifyFile(HANDLE hMpq, const char * szFileName, DWORD dwFlags)
{
return VerifyFile(hMpq,
szFileName,
NULL,
NULL,
dwFlags);
}
// Verifies raw data of the archive Only works for MPQs version 4 or newer
DWORD WINAPI SFileVerifyRawData(HANDLE hMpq, DWORD dwWhatToVerify, const char * szFileName)
{
TMPQArchive * ha = (TMPQArchive *)hMpq;
TFileEntry * pFileEntry;
TMPQHeader * pHeader;
// Verify input parameters
if(!IsValidMpqHandle(hMpq))
return ERROR_INVALID_PARAMETER;
pHeader = ha->pHeader;
// If the archive doesn't have raw data MD5, report it as OK
if(pHeader->dwRawChunkSize == 0)
return ERROR_SUCCESS;
// If we have to verify MPQ header, do it
switch(dwWhatToVerify)
{
case SFILE_VERIFY_MPQ_HEADER:
// Only if the header is of version 4 or newer
if(pHeader->dwHeaderSize >= (MPQ_HEADER_SIZE_V4 - MD5_DIGEST_SIZE))
return VerifyRawMpqData(ha, 0, MPQ_HEADER_SIZE_V4 - MD5_DIGEST_SIZE);
return ERROR_SUCCESS;
case SFILE_VERIFY_HET_TABLE:
// Only if we have HET table
if(pHeader->HetTablePos64 && pHeader->HetTableSize64)
return VerifyRawMpqData(ha, pHeader->HetTablePos64, (DWORD)pHeader->HetTableSize64);
return ERROR_SUCCESS;
case SFILE_VERIFY_BET_TABLE:
// Only if we have BET table
if(pHeader->BetTablePos64 && pHeader->BetTableSize64)
return VerifyRawMpqData(ha, pHeader->BetTablePos64, (DWORD)pHeader->BetTableSize64);
return ERROR_SUCCESS;
case SFILE_VERIFY_HASH_TABLE:
// Hash table is not protected by MD5
return ERROR_SUCCESS;
case SFILE_VERIFY_BLOCK_TABLE:
// Block table is not protected by MD5
return ERROR_SUCCESS;
case SFILE_VERIFY_HIBLOCK_TABLE:
// It is unknown if the hi-block table is protected my MD5 or not.
return ERROR_SUCCESS;
case SFILE_VERIFY_FILE:
// Verify parameters
if(szFileName == NULL || *szFileName == 0)
return ERROR_INVALID_PARAMETER;
// Get the offset of a file
pFileEntry = GetFileEntryLocale(ha, szFileName, g_lcFileLocale);
if(pFileEntry == NULL)
return ERROR_FILE_NOT_FOUND;
return VerifyRawMpqData(ha, pFileEntry->ByteOffset, pFileEntry->dwCmpSize);
}
return ERROR_INVALID_PARAMETER;
}
// Verifies the archive against the signature
DWORD WINAPI SFileVerifyArchive(HANDLE hMpq)
{
MPQ_SIGNATURE_INFO si;
TMPQArchive * ha = (TMPQArchive *)hMpq;
// Verify input parameters
if(!IsValidMpqHandle(hMpq))
return ERROR_VERIFY_FAILED;
// If the archive was modified, we need to flush it
if(ha->dwFlags & MPQ_FLAG_CHANGED)
SFileFlushArchive(hMpq);
// Get the MPQ signature and signature type
memset(&si, 0, sizeof(MPQ_SIGNATURE_INFO));
if(!QueryMpqSignatureInfo(ha, &si))
return ERROR_VERIFY_FAILED;
// If there is no signature
if(si.SignatureTypes == 0)
return ERROR_NO_SIGNATURE;
// We haven't seen a MPQ with both signatures
assert(si.SignatureTypes == SIGNATURE_TYPE_WEAK || si.SignatureTypes == SIGNATURE_TYPE_STRONG);
// Verify the strong signature, if present
if(si.SignatureTypes & SIGNATURE_TYPE_STRONG)
return VerifyStrongSignature(ha, &si);
// Verify the weak signature, if present
if(si.SignatureTypes & SIGNATURE_TYPE_WEAK)
return VerifyWeakSignature(ha, &si);
return ERROR_NO_SIGNATURE;
}
// Verifies the archive against the signature
bool WINAPI SFileSignArchive(HANDLE hMpq, DWORD dwSignatureType)
{
TMPQArchive * ha;
// Verify the archive handle
ha = IsValidMpqHandle(hMpq);
if(ha == NULL)
{
SetLastError(ERROR_INVALID_PARAMETER);
return false;
}
// We only support weak signature, and only for MPQs version 1.0
if(dwSignatureType != SIGNATURE_TYPE_WEAK)
{
SetLastError(ERROR_INVALID_PARAMETER);
return false;
}
// The archive must not be malformed and must not be read-only
if(ha->dwFlags & (MPQ_FLAG_READ_ONLY | MPQ_FLAG_MALFORMED))
{
SetLastError(ERROR_ACCESS_DENIED);
return false;
}
// If the signature is not there yet
if(ha->dwFileFlags3 == 0)
{
// Turn the signature on. The signature will
// be applied when the archive is closed
ha->dwFlags |= MPQ_FLAG_SIGNATURE_NEW | MPQ_FLAG_CHANGED;
ha->dwFileFlags3 = MPQ_FILE_EXISTS;
ha->dwReservedFiles++;
}
return true;
}
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