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https://github.com/cemu-project/Cemu.git
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FST: Refactoring to fix a read bug + verify all reads
- Fixes a bug where corrupted data would be returned when reading files from unhashed sections with non-block aligned offset or size - Added hash checks for all reads where possible. This means that FST now can automatically catch corruptions when they are encountered while reading from the volume
This commit is contained in:
Exzap
parent
ca2e0a7c31
commit
a5717e1b11
@ -3,8 +3,7 @@
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#include "Cemu/ncrypto/ncrypto.h"
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#include "Cafe/Filesystem/WUD/wud.h"
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#include "util/crypto/aes128.h"
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#include "openssl/evp.h" /* EVP_Digest */
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#include "openssl/sha.h" /* SHA1 / SHA256_DIGEST_LENGTH */
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#include "openssl/sha.h" /* SHA1 / SHA256 */
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#include "fstUtil.h"
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#include "FST.h"
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@ -141,7 +140,7 @@ struct DiscPartitionTableHeader
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static constexpr uint32 MAGIC_VALUE = 0xCCA6E67B;
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/* +0x00 */ uint32be magic;
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/* +0x04 */ uint32be sectorSize; // must be 0x8000?
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/* +0x04 */ uint32be blockSize; // must be 0x8000?
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/* +0x08 */ uint8 partitionTableHash[20]; // hash of the data range at +0x800 to end of sector (0x8000)
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/* +0x1C */ uint32be numPartitions;
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};
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@ -164,10 +163,10 @@ struct DiscPartitionHeader
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static constexpr uint32 MAGIC_VALUE = 0xCC93A4F5;
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/* +0x00 */ uint32be magic;
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/* +0x04 */ uint32be sectorSize; // must match DISC_SECTOR_SIZE
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/* +0x04 */ uint32be sectorSize; // must match DISC_SECTOR_SIZE for hashed blocks
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/* +0x08 */ uint32be ukn008;
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/* +0x0C */ uint32be ukn00C;
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/* +0x0C */ uint32be ukn00C; // h3 array size?
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/* +0x10 */ uint32be h3HashNum;
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/* +0x14 */ uint32be fstSize; // in bytes
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/* +0x18 */ uint32be fstSector; // relative to partition start
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@ -178,13 +177,15 @@ struct DiscPartitionHeader
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/* +0x24 */ uint8 fstHashType;
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/* +0x25 */ uint8 fstEncryptionType; // purpose of this isn't really understood. Maybe it controls which key is being used? (1 -> disc key, 2 -> partition key)
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/* +0x26 */ uint8 versionA;
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/* +0x27 */ uint8 ukn027; // also a version field?
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/* +0x26 */ uint8be versionA;
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/* +0x27 */ uint8be ukn027; // also a version field?
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// there is an array at +0x40 ? Related to H3 list. Also related to value at +0x0C and h3HashNum
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/* +0x28 */ uint8be _uknOrPadding028[0x18];
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/* +0x40 */ uint8be h3HashArray[32]; // dynamic size. Only present if fstHashType != 0
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};
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static_assert(sizeof(DiscPartitionHeader) == 0x28);
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static_assert(sizeof(DiscPartitionHeader) == 0x40+0x20);
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bool FSTVolume::FindDiscKey(const fs::path& path, NCrypto::AesKey& discTitleKey)
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{
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@ -269,7 +270,7 @@ FSTVolume* FSTVolume::OpenFromDiscImage(const fs::path& path, NCrypto::AesKey& d
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cemuLog_log(LogType::Force, "Disc image rejected because decryption failed");
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return nullptr;
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}
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if (partitionHeader->sectorSize != DISC_SECTOR_SIZE)
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if (partitionHeader->blockSize != DISC_SECTOR_SIZE)
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{
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cemuLog_log(LogType::Force, "Disc image rejected because partition sector size is invalid");
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return nullptr;
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@ -336,6 +337,9 @@ FSTVolume* FSTVolume::OpenFromDiscImage(const fs::path& path, NCrypto::AesKey& d
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cemu_assert_debug(partitionHeaderSI.fstEncryptionType == 1);
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// todo - check other fields?
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if(partitionHeaderSI.fstHashType == 0 && partitionHeaderSI.h3HashNum != 0)
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cemuLog_log(LogType::Force, "FST: Partition uses unhashed blocks but stores a non-zero amount of H3 hashes");
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// GM partition
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DiscPartitionHeader partitionHeaderGM{};
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if (!readPartitionHeader(partitionHeaderGM, gmPartitionIndex))
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@ -349,9 +353,10 @@ FSTVolume* FSTVolume::OpenFromDiscImage(const fs::path& path, NCrypto::AesKey& d
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// if decryption is necessary
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// load SI FST
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dataSource->SetBaseOffset((uint64)partitionArray[siPartitionIndex].partitionAddress * DISC_SECTOR_SIZE);
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auto siFST = OpenFST(dataSource.get(), (uint64)partitionHeaderSI.fstSector * DISC_SECTOR_SIZE, partitionHeaderSI.fstSize, &discTitleKey, static_cast<FSTVolume::ClusterHashMode>(partitionHeaderSI.fstHashType));
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auto siFST = OpenFST(dataSource.get(), (uint64)partitionHeaderSI.fstSector * DISC_SECTOR_SIZE, partitionHeaderSI.fstSize, &discTitleKey, static_cast<FSTVolume::ClusterHashMode>(partitionHeaderSI.fstHashType), nullptr);
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if (!siFST)
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return nullptr;
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cemu_assert_debug(!(siFST->HashIsDisabled() && partitionHeaderSI.h3HashNum != 0)); // if hash is disabled, no H3 data may be present
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// load ticket file for partition that we want to decrypt
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NCrypto::ETicketParser ticketParser;
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std::vector<uint8> ticketData = siFST->ExtractFile(fmt::format("{:02x}/title.tik", gmPartitionIndex));
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@ -360,16 +365,32 @@ FSTVolume* FSTVolume::OpenFromDiscImage(const fs::path& path, NCrypto::AesKey& d
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cemuLog_log(LogType::Force, "Disc image ticket file is invalid");
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return nullptr;
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}
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#if 0
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// each SI partition seems to contain a title.tmd that we could parse and which should have information about the associated GM partition
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// but the console seems to ignore this file for disc images, at least when mounting, so we shouldn't rely on it either
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std::vector<uint8> tmdData = siFST->ExtractFile(fmt::format("{:02x}/title.tmd", gmPartitionIndex));
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if (tmdData.empty())
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{
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cemuLog_log(LogType::Force, "Disc image TMD file is missing");
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return nullptr;
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}
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// parse TMD
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NCrypto::TMDParser tmdParser;
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if (!tmdParser.parse(tmdData.data(), tmdData.size()))
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{
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cemuLog_log(LogType::Force, "Disc image TMD file is invalid");
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return nullptr;
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}
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#endif
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delete siFST;
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NCrypto::AesKey gmTitleKey;
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ticketParser.GetTitleKey(gmTitleKey);
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// load GM partition
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dataSource->SetBaseOffset((uint64)partitionArray[gmPartitionIndex].partitionAddress * DISC_SECTOR_SIZE);
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FSTVolume* r = OpenFST(std::move(dataSource), (uint64)partitionHeaderGM.fstSector * DISC_SECTOR_SIZE, partitionHeaderGM.fstSize, &gmTitleKey, static_cast<FSTVolume::ClusterHashMode>(partitionHeaderGM.fstHashType));
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FSTVolume* r = OpenFST(std::move(dataSource), (uint64)partitionHeaderGM.fstSector * DISC_SECTOR_SIZE, partitionHeaderGM.fstSize, &gmTitleKey, static_cast<FSTVolume::ClusterHashMode>(partitionHeaderGM.fstHashType), nullptr);
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if (r)
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SET_FST_ERROR(OK);
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cemu_assert_debug(!(r->HashIsDisabled() && partitionHeaderGM.h3HashNum != 0)); // if hash is disabled, no H3 data may be present
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return r;
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}
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@ -426,15 +447,15 @@ FSTVolume* FSTVolume::OpenFromContentFolder(fs::path folderPath, ErrorCode* erro
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}
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// load FST
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// fstSize = size of first cluster?
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FSTVolume* fstVolume = FSTVolume::OpenFST(std::move(dataSource), 0, fstSize, &titleKey, fstHashMode);
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FSTVolume* fstVolume = FSTVolume::OpenFST(std::move(dataSource), 0, fstSize, &titleKey, fstHashMode, &tmdParser);
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if (fstVolume)
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SET_FST_ERROR(OK);
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return fstVolume;
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}
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FSTVolume* FSTVolume::OpenFST(FSTDataSource* dataSource, uint64 fstOffset, uint32 fstSize, NCrypto::AesKey* partitionTitleKey, ClusterHashMode fstHashMode)
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FSTVolume* FSTVolume::OpenFST(FSTDataSource* dataSource, uint64 fstOffset, uint32 fstSize, NCrypto::AesKey* partitionTitleKey, ClusterHashMode fstHashMode, NCrypto::TMDParser* optionalTMD)
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{
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cemu_assert_debug(fstHashMode != ClusterHashMode::RAW || fstHashMode != ClusterHashMode::RAW2);
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cemu_assert_debug(fstHashMode != ClusterHashMode::RAW || fstHashMode != ClusterHashMode::RAW_STREAM);
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if (fstSize < sizeof(FSTHeader))
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return nullptr;
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constexpr uint64 FST_CLUSTER_OFFSET = 0;
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@ -465,6 +486,34 @@ FSTVolume* FSTVolume::OpenFST(FSTDataSource* dataSource, uint64 fstOffset, uint3
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clusterTable[i].offset = clusterDataTable[i].offset;
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clusterTable[i].size = clusterDataTable[i].size;
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clusterTable[i].hashMode = static_cast<FSTVolume::ClusterHashMode>((uint8)clusterDataTable[i].hashMode);
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clusterTable[i].hasContentHash = false; // from the TMD file (H4?)
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}
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// if the TMD is available (when opening .app files) we can use the extra info from it to validate unhashed clusters
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// each content entry in the TMD corresponds to one cluster used by the FST
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if(optionalTMD)
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{
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if(numCluster != optionalTMD->GetContentList().size())
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{
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cemuLog_log(LogType::Force, "FST: Number of clusters does not match TMD content list");
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return nullptr;
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}
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auto& contentList = optionalTMD->GetContentList();
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for(size_t i=0; i<contentList.size(); i++)
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{
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auto& cluster = clusterTable[i];
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auto& content = contentList[i];
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cluster.hasContentHash = true;
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cluster.contentHashIsSHA1 = HAS_FLAG(contentList[i].contentFlags, NCrypto::TMDParser::TMDContentFlags::FLAG_SHA1);
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cluster.contentSize = content.size;
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static_assert(sizeof(content.hash32) == sizeof(cluster.contentHash32));
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memcpy(cluster.contentHash32, content.hash32, sizeof(cluster.contentHash32));
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// if unhashed mode, then initialize the hash context
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if(cluster.hashMode == ClusterHashMode::RAW || cluster.hashMode == ClusterHashMode::RAW_STREAM)
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{
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cluster.singleHashCtx.reset(EVP_MD_CTX_new());
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EVP_DigestInit_ex(cluster.singleHashCtx.get(), cluster.contentHashIsSHA1 ? EVP_sha1() : EVP_sha256(), nullptr);
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}
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}
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}
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// preprocess FST table
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FSTHeader_FileEntry* fileTable = (FSTHeader_FileEntry*)(clusterDataTable + numCluster);
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@ -491,16 +540,17 @@ FSTVolume* FSTVolume::OpenFST(FSTDataSource* dataSource, uint64 fstOffset, uint3
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fstVolume->m_offsetFactor = fstHeader->offsetFactor;
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fstVolume->m_sectorSize = DISC_SECTOR_SIZE;
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fstVolume->m_partitionTitlekey = *partitionTitleKey;
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std::swap(fstVolume->m_cluster, clusterTable);
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std::swap(fstVolume->m_entries, fstEntries);
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std::swap(fstVolume->m_nameStringTable, nameStringTable);
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fstVolume->m_hashIsDisabled = fstHeader->hashIsDisabled != 0;
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fstVolume->m_cluster = std::move(clusterTable);
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fstVolume->m_entries = std::move(fstEntries);
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fstVolume->m_nameStringTable = std::move(nameStringTable);
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return fstVolume;
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}
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FSTVolume* FSTVolume::OpenFST(std::unique_ptr<FSTDataSource> dataSource, uint64 fstOffset, uint32 fstSize, NCrypto::AesKey* partitionTitleKey, ClusterHashMode fstHashMode)
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FSTVolume* FSTVolume::OpenFST(std::unique_ptr<FSTDataSource> dataSource, uint64 fstOffset, uint32 fstSize, NCrypto::AesKey* partitionTitleKey, ClusterHashMode fstHashMode, NCrypto::TMDParser* optionalTMD)
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{
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FSTDataSource* ds = dataSource.release();
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FSTVolume* fstVolume = OpenFST(ds, fstOffset, fstSize, partitionTitleKey, fstHashMode);
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FSTVolume* fstVolume = OpenFST(ds, fstOffset, fstSize, partitionTitleKey, fstHashMode, optionalTMD);
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if (!fstVolume)
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{
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delete ds;
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@ -757,7 +807,7 @@ uint32 FSTVolume::ReadFile(FSTFileHandle& fileHandle, uint32 offset, uint32 size
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return 0;
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cemu_assert_debug(!HAS_FLAG(entry.GetFlags(), FSTEntry::FLAGS::FLAG_LINK));
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FSTCluster& cluster = m_cluster[entry.fileInfo.clusterIndex];
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if (cluster.hashMode == ClusterHashMode::RAW || cluster.hashMode == ClusterHashMode::RAW2)
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if (cluster.hashMode == ClusterHashMode::RAW || cluster.hashMode == ClusterHashMode::RAW_STREAM)
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return ReadFile_HashModeRaw(entry.fileInfo.clusterIndex, entry, offset, size, dataOut);
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else if (cluster.hashMode == ClusterHashMode::HASH_INTERLEAVED)
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return ReadFile_HashModeHashed(entry.fileInfo.clusterIndex, entry, offset, size, dataOut);
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@ -765,87 +815,15 @@ uint32 FSTVolume::ReadFile(FSTFileHandle& fileHandle, uint32 offset, uint32 size
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return 0;
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}
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uint32 FSTVolume::ReadFile_HashModeRaw(uint32 clusterIndex, FSTEntry& entry, uint32 readOffset, uint32 readSize, void* dataOut)
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{
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const uint32 readSizeInput = readSize;
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uint8* dataOutU8 = (uint8*)dataOut;
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if (readOffset >= entry.fileInfo.fileSize)
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return 0;
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else if ((readOffset + readSize) >= entry.fileInfo.fileSize)
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readSize = (entry.fileInfo.fileSize - readOffset);
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const FSTCluster& cluster = m_cluster[clusterIndex];
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uint64 clusterOffset = (uint64)cluster.offset * m_sectorSize;
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uint64 absFileOffset = entry.fileInfo.fileOffset * m_offsetFactor + readOffset;
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// make sure the raw range we read is aligned to AES block size (16)
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uint64 readAddrStart = absFileOffset & ~0xF;
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uint64 readAddrEnd = (absFileOffset + readSize + 0xF) & ~0xF;
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bool usesInitialIV = readOffset < 16;
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if (!usesInitialIV)
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readAddrStart -= 16; // read previous AES block since we require it for the IV
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uint32 prePadding = (uint32)(absFileOffset - readAddrStart); // number of extra bytes we read before readOffset (for AES alignment and IV calculation)
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uint32 postPadding = (uint32)(readAddrEnd - (absFileOffset + readSize));
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uint8 readBuffer[64 * 1024];
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// read first chunk
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// if file read offset (readOffset) is within the first AES-block then use initial IV calculated from cluster index
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// otherwise read previous AES-block is the IV (AES-CBC)
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uint64 readAddrCurrent = readAddrStart;
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uint32 rawBytesToRead = (uint32)std::min((readAddrEnd - readAddrStart), (uint64)sizeof(readBuffer));
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if (m_dataSource->readData(clusterIndex, clusterOffset, readAddrCurrent, readBuffer, rawBytesToRead) != rawBytesToRead)
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{
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cemuLog_log(LogType::Force, "FST read error in raw content");
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return 0;
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}
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readAddrCurrent += rawBytesToRead;
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uint8 iv[16]{};
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if (usesInitialIV)
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{
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// for the first AES block, the IV is initialized from cluster index
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iv[0] = (uint8)(clusterIndex >> 8);
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iv[1] = (uint8)(clusterIndex >> 0);
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AES128_CBC_decrypt_updateIV(readBuffer, readBuffer, rawBytesToRead, m_partitionTitlekey.b, iv);
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std::memcpy(dataOutU8, readBuffer + prePadding, rawBytesToRead - prePadding - postPadding);
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dataOutU8 += (rawBytesToRead - prePadding - postPadding);
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readSize -= (rawBytesToRead - prePadding - postPadding);
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}
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else
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{
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// IV is initialized from previous AES block (AES-CBC)
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std::memcpy(iv, readBuffer, 16);
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AES128_CBC_decrypt_updateIV(readBuffer + 16, readBuffer + 16, rawBytesToRead - 16, m_partitionTitlekey.b, iv);
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std::memcpy(dataOutU8, readBuffer + prePadding, rawBytesToRead - prePadding - postPadding);
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dataOutU8 += (rawBytesToRead - prePadding - postPadding);
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readSize -= (rawBytesToRead - prePadding - postPadding);
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}
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// read remaining chunks
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while (readSize > 0)
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{
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uint32 bytesToRead = (uint32)std::min((uint32)sizeof(readBuffer), readSize);
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uint32 alignedBytesToRead = (bytesToRead + 15) & ~0xF;
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if (m_dataSource->readData(clusterIndex, clusterOffset, readAddrCurrent, readBuffer, alignedBytesToRead) != alignedBytesToRead)
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{
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cemuLog_log(LogType::Force, "FST read error in raw content");
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return 0;
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}
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AES128_CBC_decrypt_updateIV(readBuffer, readBuffer, alignedBytesToRead, m_partitionTitlekey.b, iv);
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std::memcpy(dataOutU8, readBuffer, bytesToRead);
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dataOutU8 += bytesToRead;
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readSize -= bytesToRead;
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readAddrCurrent += alignedBytesToRead;
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}
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return readSizeInput - readSize;
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}
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constexpr size_t BLOCK_SIZE = 0x10000;
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constexpr size_t BLOCK_HASH_SIZE = 0x0400;
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constexpr size_t BLOCK_FILE_SIZE = 0xFC00;
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struct FSTRawBlock
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{
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std::vector<uint8> rawData; // unhashed block size depends on sector size field in partition header
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};
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struct FSTHashedBlock
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{
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uint8 rawData[BLOCK_SIZE];
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@ -887,12 +865,160 @@ struct FSTHashedBlock
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static_assert(sizeof(FSTHashedBlock) == BLOCK_SIZE);
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struct FSTCachedRawBlock
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{
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FSTRawBlock blockData;
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uint8 ivForNextBlock[16];
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uint64 lastAccess;
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};
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struct FSTCachedHashedBlock
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{
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FSTHashedBlock blockData;
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uint64 lastAccess;
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};
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// Checks cache fill state and if necessary drops least recently accessed block from the cache. Optionally allows to recycle the released cache entry to cut down cost of memory allocation and clearing
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void FSTVolume::TrimCacheIfRequired(FSTCachedRawBlock** droppedRawBlock, FSTCachedHashedBlock** droppedHashedBlock)
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{
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// calculate size used by cache
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size_t cacheSize = 0;
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for (auto& itr : m_cacheDecryptedRawBlocks)
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cacheSize += itr.second->blockData.rawData.size();
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for (auto& itr : m_cacheDecryptedHashedBlocks)
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cacheSize += sizeof(FSTCachedHashedBlock) + sizeof(FSTHashedBlock);
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// only trim if cache is full (larger than 2MB)
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if (cacheSize < 2*1024*1024) // 2MB
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return;
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// scan both cache lists to find least recently accessed block to drop
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auto dropRawItr = std::min_element(m_cacheDecryptedRawBlocks.begin(), m_cacheDecryptedRawBlocks.end(), [](const auto& a, const auto& b) -> bool
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{ return a.second->lastAccess < b.second->lastAccess; });
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auto dropHashedItr = std::min_element(m_cacheDecryptedHashedBlocks.begin(), m_cacheDecryptedHashedBlocks.end(), [](const auto& a, const auto& b) -> bool
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{ return a.second->lastAccess < b.second->lastAccess; });
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uint64 lastAccess = std::numeric_limits<uint64>::max();
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if(dropRawItr != m_cacheDecryptedRawBlocks.end())
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lastAccess = dropRawItr->second->lastAccess;
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if(dropHashedItr != m_cacheDecryptedHashedBlocks.end())
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lastAccess = std::min<uint64>(lastAccess, dropHashedItr->second->lastAccess);
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if(dropRawItr != m_cacheDecryptedRawBlocks.end() && dropRawItr->second->lastAccess == lastAccess)
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{
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if (droppedRawBlock)
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*droppedRawBlock = dropRawItr->second;
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else
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delete dropRawItr->second;
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m_cacheDecryptedRawBlocks.erase(dropRawItr);
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return;
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}
|
||||
else if(dropHashedItr != m_cacheDecryptedHashedBlocks.end() && dropHashedItr->second->lastAccess == lastAccess)
|
||||
{
|
||||
if (droppedHashedBlock)
|
||||
*droppedHashedBlock = dropHashedItr->second;
|
||||
else
|
||||
delete dropHashedItr->second;
|
||||
m_cacheDecryptedHashedBlocks.erase(dropHashedItr);
|
||||
}
|
||||
}
|
||||
|
||||
void FSTVolume::DetermineUnhashedBlockIV(uint32 clusterIndex, uint32 blockIndex, uint8 ivOut[16])
|
||||
{
|
||||
memset(ivOut, 0, sizeof(ivOut));
|
||||
if(blockIndex == 0)
|
||||
{
|
||||
ivOut[0] = (uint8)(clusterIndex >> 8);
|
||||
ivOut[1] = (uint8)(clusterIndex >> 0);
|
||||
}
|
||||
else
|
||||
{
|
||||
// the last 16 encrypted bytes of the previous block are the IV (AES CBC)
|
||||
// if the previous block is cached we can grab the IV from there. Otherwise we have to read the 16 bytes from the data source
|
||||
uint32 prevBlockIndex = blockIndex - 1;
|
||||
uint64 cacheBlockId = ((uint64)clusterIndex << (64 - 16)) | (uint64)prevBlockIndex;
|
||||
auto itr = m_cacheDecryptedRawBlocks.find(cacheBlockId);
|
||||
if (itr != m_cacheDecryptedRawBlocks.end())
|
||||
{
|
||||
memcpy(ivOut, itr->second->ivForNextBlock, 16);
|
||||
}
|
||||
else
|
||||
{
|
||||
cemu_assert(m_sectorSize >= 16);
|
||||
uint64 clusterOffset = (uint64)m_cluster[clusterIndex].offset * m_sectorSize;
|
||||
uint8 prevIV[16];
|
||||
if (m_dataSource->readData(clusterIndex, clusterOffset, blockIndex * m_sectorSize - 16, prevIV, 16) != 16)
|
||||
{
|
||||
cemuLog_log(LogType::Force, "Failed to read IV for raw FST block");
|
||||
m_detectedCorruption = true;
|
||||
return;
|
||||
}
|
||||
memcpy(ivOut, prevIV, 16);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
FSTCachedRawBlock* FSTVolume::GetDecryptedRawBlock(uint32 clusterIndex, uint32 blockIndex)
|
||||
{
|
||||
FSTCluster& cluster = m_cluster[clusterIndex];
|
||||
uint64 clusterOffset = (uint64)cluster.offset * m_sectorSize;
|
||||
// generate id for cache
|
||||
uint64 cacheBlockId = ((uint64)clusterIndex << (64 - 16)) | (uint64)blockIndex;
|
||||
// lookup block in cache
|
||||
FSTCachedRawBlock* block = nullptr;
|
||||
auto itr = m_cacheDecryptedRawBlocks.find(cacheBlockId);
|
||||
if (itr != m_cacheDecryptedRawBlocks.end())
|
||||
{
|
||||
block = itr->second;
|
||||
block->lastAccess = ++m_cacheAccessCounter;
|
||||
return block;
|
||||
}
|
||||
// if cache already full, drop least recently accessed block and recycle FSTCachedRawBlock object if possible
|
||||
TrimCacheIfRequired(&block, nullptr);
|
||||
if (!block)
|
||||
block = new FSTCachedRawBlock();
|
||||
block->blockData.rawData.resize(m_sectorSize);
|
||||
// block not cached, read new
|
||||
block->lastAccess = ++m_cacheAccessCounter;
|
||||
if (m_dataSource->readData(clusterIndex, clusterOffset, blockIndex * m_sectorSize, block->blockData.rawData.data(), m_sectorSize) != m_sectorSize)
|
||||
{
|
||||
cemuLog_log(LogType::Force, "Failed to read raw FST block");
|
||||
delete block;
|
||||
m_detectedCorruption = true;
|
||||
return nullptr;
|
||||
}
|
||||
// decrypt hash data
|
||||
uint8 iv[16]{};
|
||||
DetermineUnhashedBlockIV(clusterIndex, blockIndex, iv);
|
||||
memcpy(block->ivForNextBlock, block->blockData.rawData.data() + m_sectorSize - 16, 16);
|
||||
AES128_CBC_decrypt(block->blockData.rawData.data(), block->blockData.rawData.data(), m_sectorSize, m_partitionTitlekey.b, iv);
|
||||
// if this is the next block, then hash it
|
||||
if(cluster.hasContentHash)
|
||||
{
|
||||
if(cluster.singleHashNumBlocksHashed == blockIndex)
|
||||
{
|
||||
cemu_assert_debug(!(cluster.contentSize % m_sectorSize)); // size should be multiple of sector size? Regardless, the hashing code below can handle non-aligned sizes
|
||||
bool isLastBlock = blockIndex == (std::max<uint32>(cluster.contentSize / m_sectorSize, 1) - 1);
|
||||
uint32 hashSize = m_sectorSize;
|
||||
if(isLastBlock)
|
||||
hashSize = cluster.contentSize - (uint64)blockIndex*m_sectorSize;
|
||||
EVP_DigestUpdate(cluster.singleHashCtx.get(), block->blockData.rawData.data(), hashSize);
|
||||
cluster.singleHashNumBlocksHashed++;
|
||||
if(isLastBlock)
|
||||
{
|
||||
uint8 hash[32];
|
||||
EVP_DigestFinal_ex(cluster.singleHashCtx.get(), hash, nullptr);
|
||||
if(memcmp(hash, cluster.contentHash32, cluster.contentHashIsSHA1 ? 20 : 32) != 0)
|
||||
{
|
||||
cemuLog_log(LogType::Force, "FST: Raw section hash mismatch");
|
||||
delete block;
|
||||
m_detectedCorruption = true;
|
||||
return nullptr;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
// register in cache
|
||||
m_cacheDecryptedRawBlocks.emplace(cacheBlockId, block);
|
||||
return block;
|
||||
}
|
||||
|
||||
FSTCachedHashedBlock* FSTVolume::GetDecryptedHashedBlock(uint32 clusterIndex, uint32 blockIndex)
|
||||
{
|
||||
const FSTCluster& cluster = m_cluster[clusterIndex];
|
||||
@ -908,22 +1034,17 @@ FSTCachedHashedBlock* FSTVolume::GetDecryptedHashedBlock(uint32 clusterIndex, ui
|
||||
block->lastAccess = ++m_cacheAccessCounter;
|
||||
return block;
|
||||
}
|
||||
// if cache already full, drop least recently accessed block (but recycle the FSTHashedBlock* object)
|
||||
if (m_cacheDecryptedHashedBlocks.size() >= 16)
|
||||
{
|
||||
auto dropItr = std::min_element(m_cacheDecryptedHashedBlocks.begin(), m_cacheDecryptedHashedBlocks.end(), [](const auto& a, const auto& b) -> bool
|
||||
{ return a.second->lastAccess < b.second->lastAccess; });
|
||||
block = dropItr->second;
|
||||
m_cacheDecryptedHashedBlocks.erase(dropItr);
|
||||
}
|
||||
else
|
||||
// if cache already full, drop least recently accessed block and recycle FSTCachedHashedBlock object if possible
|
||||
TrimCacheIfRequired(nullptr, &block);
|
||||
if (!block)
|
||||
block = new FSTCachedHashedBlock();
|
||||
// block not cached, read new
|
||||
block->lastAccess = ++m_cacheAccessCounter;
|
||||
if (m_dataSource->readData(clusterIndex, clusterOffset, blockIndex * BLOCK_SIZE, block->blockData.rawData, BLOCK_SIZE) != BLOCK_SIZE)
|
||||
{
|
||||
cemuLog_log(LogType::Force, "Failed to read FST block");
|
||||
cemuLog_log(LogType::Force, "Failed to read hashed FST block");
|
||||
delete block;
|
||||
m_detectedCorruption = true;
|
||||
return nullptr;
|
||||
}
|
||||
// decrypt hash data
|
||||
@ -931,11 +1052,46 @@ FSTCachedHashedBlock* FSTVolume::GetDecryptedHashedBlock(uint32 clusterIndex, ui
|
||||
AES128_CBC_decrypt(block->blockData.getHashData(), block->blockData.getHashData(), BLOCK_HASH_SIZE, m_partitionTitlekey.b, iv);
|
||||
// decrypt file data
|
||||
AES128_CBC_decrypt(block->blockData.getFileData(), block->blockData.getFileData(), BLOCK_FILE_SIZE, m_partitionTitlekey.b, block->blockData.getH0Hash(blockIndex%16));
|
||||
// compare with H0 to verify data integrity
|
||||
NCrypto::CHash160 h0;
|
||||
SHA1(block->blockData.getFileData(), BLOCK_FILE_SIZE, h0.b);
|
||||
uint32 h0Index = (blockIndex % 4096);
|
||||
if (memcmp(h0.b, block->blockData.getH0Hash(h0Index & 0xF), sizeof(h0.b)) != 0)
|
||||
{
|
||||
cemuLog_log(LogType::Force, "FST: Hash H0 mismatch in hashed block (section {} index {})", clusterIndex, blockIndex);
|
||||
delete block;
|
||||
m_detectedCorruption = true;
|
||||
return nullptr;
|
||||
}
|
||||
// register in cache
|
||||
m_cacheDecryptedHashedBlocks.emplace(cacheBlockId, block);
|
||||
return block;
|
||||
}
|
||||
|
||||
uint32 FSTVolume::ReadFile_HashModeRaw(uint32 clusterIndex, FSTEntry& entry, uint32 readOffset, uint32 readSize, void* dataOut)
|
||||
{
|
||||
uint8* dataOutU8 = (uint8*)dataOut;
|
||||
if (readOffset >= entry.fileInfo.fileSize)
|
||||
return 0;
|
||||
else if ((readOffset + readSize) >= entry.fileInfo.fileSize)
|
||||
readSize = (entry.fileInfo.fileSize - readOffset);
|
||||
uint64 absFileOffset = entry.fileInfo.fileOffset * m_offsetFactor + readOffset;
|
||||
uint32 remainingReadSize = readSize;
|
||||
while (remainingReadSize > 0)
|
||||
{
|
||||
const FSTCachedRawBlock* rawBlock = this->GetDecryptedRawBlock(clusterIndex, absFileOffset/m_sectorSize);
|
||||
if (!rawBlock)
|
||||
break;
|
||||
uint32 blockOffset = (uint32)(absFileOffset % m_sectorSize);
|
||||
uint32 bytesToRead = std::min<uint32>(remainingReadSize, m_sectorSize - blockOffset);
|
||||
std::memcpy(dataOutU8, rawBlock->blockData.rawData.data() + blockOffset, bytesToRead);
|
||||
dataOutU8 += bytesToRead;
|
||||
remainingReadSize -= bytesToRead;
|
||||
absFileOffset += bytesToRead;
|
||||
}
|
||||
return readSize - remainingReadSize;
|
||||
}
|
||||
|
||||
uint32 FSTVolume::ReadFile_HashModeHashed(uint32 clusterIndex, FSTEntry& entry, uint32 readOffset, uint32 readSize, void* dataOut)
|
||||
{
|
||||
/*
|
||||
@ -966,7 +1122,6 @@ uint32 FSTVolume::ReadFile_HashModeHashed(uint32 clusterIndex, FSTEntry& entry,
|
||||
*/
|
||||
|
||||
const FSTCluster& cluster = m_cluster[clusterIndex];
|
||||
uint64 clusterBaseOffset = (uint64)cluster.offset * m_sectorSize;
|
||||
uint64 fileReadOffset = entry.fileInfo.fileOffset * m_offsetFactor + readOffset;
|
||||
uint32 blockIndex = (uint32)(fileReadOffset / BLOCK_FILE_SIZE);
|
||||
uint32 bytesRemaining = readSize;
|
||||
@ -1019,6 +1174,8 @@ bool FSTVolume::Next(FSTDirectoryIterator& directoryIterator, FSTFileHandle& fil
|
||||
|
||||
FSTVolume::~FSTVolume()
|
||||
{
|
||||
for (auto& itr : m_cacheDecryptedRawBlocks)
|
||||
delete itr.second;
|
||||
for (auto& itr : m_cacheDecryptedHashedBlocks)
|
||||
delete itr.second;
|
||||
if (m_sourceIsOwned)
|
||||
|
||||
@ -1,5 +1,6 @@
|
||||
#pragma once
|
||||
#include "Cemu/ncrypto/ncrypto.h"
|
||||
#include "openssl/evp.h"
|
||||
|
||||
struct FSTFileHandle
|
||||
{
|
||||
@ -45,6 +46,7 @@ public:
|
||||
~FSTVolume();
|
||||
|
||||
uint32 GetFileCount() const;
|
||||
bool HasCorruption() const { return m_detectedCorruption; }
|
||||
|
||||
bool OpenFile(std::string_view path, FSTFileHandle& fileHandleOut, bool openOnlyFiles = false);
|
||||
|
||||
@ -86,15 +88,25 @@ private:
|
||||
enum class ClusterHashMode : uint8
|
||||
{
|
||||
RAW = 0, // raw data + encryption, no hashing?
|
||||
RAW2 = 1, // raw data + encryption, with hash stored in tmd?
|
||||
RAW_STREAM = 1, // raw data + encryption, with hash stored in tmd?
|
||||
HASH_INTERLEAVED = 2, // hashes + raw interleaved in 0x10000 blocks (0x400 bytes of hashes at the beginning, followed by 0xFC00 bytes of data)
|
||||
};
|
||||
|
||||
struct FSTCluster
|
||||
{
|
||||
FSTCluster() : singleHashCtx(nullptr, &EVP_MD_CTX_free) {}
|
||||
|
||||
uint32 offset;
|
||||
uint32 size;
|
||||
ClusterHashMode hashMode;
|
||||
// extra data if TMD is available
|
||||
bool hasContentHash;
|
||||
uint8 contentHash32[32];
|
||||
bool contentHashIsSHA1; // if true then it's SHA1 (with extra bytes zeroed out), otherwise it's SHA256
|
||||
uint64 contentSize; // size of the content (in blocks)
|
||||
// hash context for single hash mode (content hash must be available)
|
||||
std::unique_ptr<EVP_MD_CTX, decltype(&EVP_MD_CTX_free)> singleHashCtx; // unique_ptr to make this move-only
|
||||
uint32 singleHashNumBlocksHashed{0};
|
||||
};
|
||||
|
||||
struct FSTEntry
|
||||
@ -164,17 +176,30 @@ private:
|
||||
bool m_sourceIsOwned{};
|
||||
uint32 m_sectorSize{}; // for cluster offsets
|
||||
uint32 m_offsetFactor{}; // for file offsets
|
||||
bool m_hashIsDisabled{}; // disables hash verification (for all clusters of this volume?)
|
||||
std::vector<FSTCluster> m_cluster;
|
||||
std::vector<FSTEntry> m_entries;
|
||||
std::vector<char> m_nameStringTable;
|
||||
NCrypto::AesKey m_partitionTitlekey;
|
||||
bool m_detectedCorruption{false};
|
||||
|
||||
/* Cache for decrypted hashed blocks */
|
||||
bool HashIsDisabled() const
|
||||
{
|
||||
return m_hashIsDisabled;
|
||||
}
|
||||
|
||||
/* Cache for decrypted raw and hashed blocks */
|
||||
std::unordered_map<uint64, struct FSTCachedRawBlock*> m_cacheDecryptedRawBlocks;
|
||||
std::unordered_map<uint64, struct FSTCachedHashedBlock*> m_cacheDecryptedHashedBlocks;
|
||||
uint64 m_cacheAccessCounter{};
|
||||
|
||||
void DetermineUnhashedBlockIV(uint32 clusterIndex, uint32 blockIndex, uint8 ivOut[16]);
|
||||
|
||||
struct FSTCachedRawBlock* GetDecryptedRawBlock(uint32 clusterIndex, uint32 blockIndex);
|
||||
struct FSTCachedHashedBlock* GetDecryptedHashedBlock(uint32 clusterIndex, uint32 blockIndex);
|
||||
|
||||
void TrimCacheIfRequired(struct FSTCachedRawBlock** droppedRawBlock, struct FSTCachedHashedBlock** droppedHashedBlock);
|
||||
|
||||
/* File reading */
|
||||
uint32 ReadFile_HashModeRaw(uint32 clusterIndex, FSTEntry& entry, uint32 readOffset, uint32 readSize, void* dataOut);
|
||||
uint32 ReadFile_HashModeHashed(uint32 clusterIndex, FSTEntry& entry, uint32 readOffset, uint32 readSize, void* dataOut);
|
||||
@ -185,7 +210,10 @@ private:
|
||||
/* +0x00 */ uint32be magic;
|
||||
/* +0x04 */ uint32be offsetFactor;
|
||||
/* +0x08 */ uint32be numCluster;
|
||||
/* +0x0C */ uint32be ukn0C;
|
||||
/* +0x0C */ uint8be hashIsDisabled;
|
||||
/* +0x0D */ uint8be ukn0D;
|
||||
/* +0x0E */ uint8be ukn0E;
|
||||
/* +0x0F */ uint8be ukn0F;
|
||||
/* +0x10 */ uint32be ukn10;
|
||||
/* +0x14 */ uint32be ukn14;
|
||||
/* +0x18 */ uint32be ukn18;
|
||||
@ -262,8 +290,8 @@ private:
|
||||
|
||||
static_assert(sizeof(FSTHeader_FileEntry) == 0x10);
|
||||
|
||||
static FSTVolume* OpenFST(FSTDataSource* dataSource, uint64 fstOffset, uint32 fstSize, NCrypto::AesKey* partitionTitleKey, ClusterHashMode fstHashMode);
|
||||
static FSTVolume* OpenFST(std::unique_ptr<FSTDataSource> dataSource, uint64 fstOffset, uint32 fstSize, NCrypto::AesKey* partitionTitleKey, ClusterHashMode fstHashMode);
|
||||
static FSTVolume* OpenFST(FSTDataSource* dataSource, uint64 fstOffset, uint32 fstSize, NCrypto::AesKey* partitionTitleKey, ClusterHashMode fstHashMode, NCrypto::TMDParser* optionalTMD);
|
||||
static FSTVolume* OpenFST(std::unique_ptr<FSTDataSource> dataSource, uint64 fstOffset, uint32 fstSize, NCrypto::AesKey* partitionTitleKey, ClusterHashMode fstHashMode, NCrypto::TMDParser* optionalTMD);
|
||||
static bool ProcessFST(FSTHeader_FileEntry* fileTable, uint32 numFileEntries, uint32 numCluster, std::vector<char>& nameStringTable, std::vector<FSTEntry>& fstEntries);
|
||||
|
||||
bool MatchFSTEntryName(FSTEntry& entry, std::string_view comparedName)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user