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xex.cpp
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xex.cpp
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#ifdef IDALDR
#include <ida.hpp>
#include <diskio.hpp>
#include <typeinf.hpp>
#else
#include <cstdarg>
#endif
#include "xex.hpp"
#include "xex_headerids.hpp"
#include "xex_keys.hpp"
#include <cstring>
#include <cstdio>
#include <memory>
#include <cstdlib>
#include "3rdparty/aes.hpp"
#include <excrypt.h>
int lzx_decompress(const void* lzx_data, size_t lzx_len, void* dest,
size_t dest_len, uint32_t window_size, void* window_data,
size_t window_data_len); // lzx.cpp
bool xex_log_verbose = true;
bool XEXFile::load(void* file)
{
seek(file, 0, SEEK_END);
auto fsize = tell(file);
seek(file, 0, 0);
load_error_ = uint32_t(XEXLoadError::Unfinished);
read(&xex_header_, sizeof(xex::XexHeader), 1, file);
*(uint32_t*)&xex_header_.ModuleFlags =
_byteswap_ulong(*(uint32_t*)&xex_header_.ModuleFlags);
if (xex_header_.Magic != MAGIC_XEX2 && xex_header_.Magic != MAGIC_XEX1 &&
xex_header_.Magic != MAGIC_XEX25 && xex_header_.Magic != MAGIC_XEX2D &&
xex_header_.Magic != MAGIC_XEX3F && xex_header_.Magic != MAGIC_XEX0)
{
load_error_ = uint32_t(XEXLoadError::InvalidMagic);
return false;
}
// Convert XEX0/XEX3F header to XEX2
int dirHeaderOffset = sizeof(xex::XexHeader);
if (xex_header_.Magic == MAGIC_XEX0)
{
memset(&xex_header_, 0, sizeof(xex::XexHeader));
seek(file, 0, 0);
xex0::XexHeader header0;
read(&header0, sizeof(xex0::XexHeader), 1, file);
xex_header_.Magic = header0.Magic;
xex_header_.SizeOfHeaders = header0.SizeOfHeaders;
security_info_.ImageInfo.LoadAddress = header0.LoadAddress;
security_info_.ImageSize = header0.ImageSize;
xex_header_.HeaderDirectoryEntryCount = header0.HeaderDirectoryEntryCount;
dirHeaderOffset = sizeof(xex0::XexHeader);
}
else if (xex_header_.Magic == MAGIC_XEX3F)
{
memset(&xex_header_, 0, sizeof(xex::XexHeader));
seek(file, 0, 0);
xex3f::XexHeader header3f;
read(&header3f, sizeof(xex3f::XexHeader), 1, file);
xex_header_.Magic = header3f.Magic;
// TODO: convert flags from pre-XEX1 to XEX1+?
*(uint32_t*)&xex_header_.ModuleFlags =
_byteswap_ulong(*(uint32_t*)&header3f.ModuleFlags);
xex_header_.SizeOfHeaders = header3f.SizeOfHeaders;
xex_header_.SizeOfDiscardableHeaders = header3f.SizeOfDiscardableHeaders;
security_info_.ImageInfo.LoadAddress = header3f.LoadAddress;
security_info_.ImageSize = header3f.ImageSize;
xex_header_.HeaderDirectoryEntryCount = header3f.HeaderDirectoryEntryCount;
dirHeaderOffset = sizeof(xex3f::XexHeader);
}
// Read in XEX header section
xex_headers_.resize(xex_header_.SizeOfHeaders);
seek(file, 0, 0);
read(xex_headers_.data(), 1, xex_header_.SizeOfHeaders, file);
data_length_ = (uint32_t)(fsize - xex_header_.SizeOfHeaders);
seek(file, dirHeaderOffset, 0);
// Read in directory entry / optional header keyvalues
for (uint32_t i = 0; i < xex_header_.HeaderDirectoryEntryCount; i++)
{
xex::XexDirectoryEntry header;
read(&header, sizeof(xex::XexDirectoryEntry), 1, file);
directory_entries_[header.Key] = header.Value;
// XEX25 (and probably XEX2D) use a different imports key
// some part of them isn't loading properly though, so disable loading imports for those for now
#ifndef IDALDR
if (header.Key == XEX_HEADER_IMPORTS_BETA)
directory_entries_[XEX_HEADER_IMPORTS] = header.Value;
#endif
if (header.Key == XEX_HEADER_BUILD_VERSIONS_BETA)
directory_entries_[XEX_HEADER_BUILD_VERSIONS] = header.Value;
if (header.Key == XEX_HEADER_TLS_DATA_BETA)
directory_entries_[XEX_HEADER_TLS_DATA] = header.Value;
if (header.Key == XEX_HEADER_STACK_SIZE_BETA)
directory_entries_[XEX_HEADER_STACK_SIZE] = header.Value;
// Not sure if we should do this:
if (header.Key == XEX_HEADER_PE_EXPORTS_BETA)
directory_entries_[XEX_HEADER_PE_EXPORTS] = header.Value;
}
// Read security info
has_secinfo_ = read_secinfo(file);
if (has_secinfo_) {
uint32_t state = verify_secinfo(file);
// Kinda hacky way to get the security info size...
// Maybe should save this somewhere when reading instead?
auto page_desc_size = security_info_.PageDescriptorCount * sizeof(xex::HvPageInfo);
auto secinfo_size = security_info_.Size - page_desc_size;
seek(file, xex_header_.SecurityInfo + secinfo_size, 0);
for (uint32_t i = 0; i < security_info_.PageDescriptorCount; i++) {
xex::HvPageInfo page_desc;
read(&page_desc, sizeof(xex::HvPageInfo), 1, file);
// bitfields, ugh, endianswap manually
page_desc.SizeInfo = _byteswap_ulong(page_desc.SizeInfo);
page_descriptors_.push_back(page_desc);
}
}
// Read various optional headers
if (directory_entries_.count(XEX_HEADER_PE_BASE))
opt_base_address_ = directory_entries_[XEX_HEADER_PE_BASE];
if (directory_entries_.count(XEX_HEADER_ENTRY_POINT))
entry_point_ = directory_entries_[XEX_HEADER_ENTRY_POINT];
*(uint32_t*)&privileges_ = opt_header(XEX_HEADER_PRIVILEGES);
*(uint32_t*)&privileges32_ = opt_header(XEX_HEADER_PRIVILEGES_32);
execution_id_ = opt_header_ptr<xex_opt::XexExecutionId>(XEX_HEADER_EXECUTION_ID);
if (execution_id_)
{
if (header().Magic != MAGIC_XEX2D)
{
*(uint32_t*)&execution_id_->BaseVersion = _byteswap_ulong(*(uint32_t*)&execution_id_->BaseVersion);
*(uint32_t*)&execution_id_->Version = _byteswap_ulong(*(uint32_t*)&execution_id_->Version);
}
else
{
auto* exec_2d = (xex_opt::xex2d::XexExecutionId*)execution_id_;
*(uint32_t*)&exec_2d->Version = _byteswap_ulong(*(uint32_t*)&exec_2d->Version);
}
}
auto exec_id_25 = opt_header_ptr<xex_opt::xex25::XexExecutionId>(XEX_HEADER_EXECUTION_ID_BETA);
if (exec_id_25)
*(uint32_t*)&exec_id_25->Version = _byteswap_ulong(*(uint32_t*)&exec_id_25->Version);
vital_stats_ = opt_header_ptr<xex_opt::XexVitalStats>(XEX_HEADER_VITAL_STATS);
tls_data_ = opt_header_ptr<xex_opt::XexTlsData>(XEX_HEADER_TLS_DATA);
data_descriptor_ = opt_header_ptr<xex_opt::XexFileDataDescriptor>(XEX_FILE_DATA_DESCRIPTOR_HEADER);
auto libs = opt_header_ptr<xex_opt::XexImageLibraryVersions>(XEX_HEADER_BUILD_VERSIONS);
if (libs)
{
auto count = (libs->Size - 4) / sizeof(xex_opt::XexImageLibraryVersion);
for (uint32_t i = 0; i < count; i++)
libraries_.push_back(libs->Libraries[i]);
}
if (directory_entries_.count(XEX_HEADER_PE_MODULE_NAME))
{
auto* header = opt_header_ptr<xex_opt::XexStringHeader>(XEX_HEADER_PE_MODULE_NAME);
if (header)
pe_module_name_ = std::string(header->Data, (uint32_t)header->Size);
}
// Try decrypting/decompressing the basefile
if (!read_basefile(file, 0) && !read_basefile(file, 1) && !read_basefile(file, 2) && !read_basefile(file, 3))
return false;
// Basefile seems to have read fine, try reading the PE headers
if (basefile_is_pe())
if (!pe_load(pe_data_.data()))
return false;
// Let's map in the XEX sections too, seeing as there's no tools for pre-XEX2 to view these with
auto sects = opt_header_ptr<xex_opt::XexSectionHeaders>(XEX_HEADER_SECTION_TABLE);
if (sects)
{
auto count = (sects->Size - 4) / sizeof(xex_opt::XexSectionHeader);
for (uint32_t i = 0; i < count; i++)
{
auto& section = sects->Sections[i];
IMAGE_SECTION_HEADER pe_sec = {};
pe_sec.Characteristics = IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ;
pe_sec.VirtualAddress = section.VirtualAddress - base_address();
pe_sec.VirtualSize = section.VirtualSize;
pe_sec.SizeOfRawData = section.VirtualSize;
std::copy_n(section.SectionName, 8, pe_sec.Name);
xex_sections_.push_back(pe_sec);
}
}
// XEX3F stores resources with PE sections in a different table:
auto sects_beta = opt_header_ptr<xex_opt::xex3f::XexSectionHeaders>(XEX_HEADER_SECTION_TABLE_BETA);
if (sects_beta)
{
auto count = (sects_beta->Size - 4) / sizeof(xex_opt::xex3f::XexSectionHeader);
auto start_index = sections_.size(); // skip PE sections
for (auto i = start_index; i < count; i++)
{
auto& section = sects_beta->Sections[i];
IMAGE_SECTION_HEADER pe_sec = {};
pe_sec.Characteristics = IMAGE_SCN_CNT_INITIALIZED_DATA;
if ((section.PageInfoFlags & xex::HvPageInfoFlags::PageInfoFlag_NoWrite))
{
if (!(section.PageInfoFlags & xex::HvPageInfoFlags::PageInfoFlag_NoExecute))
pe_sec.Characteristics = IMAGE_SCN_CNT_CODE;
}
pe_sec.Characteristics |= IMAGE_SCN_MEM_READ;
if (!(section.PageInfoFlags & xex::HvPageInfoFlags::PageInfoFlag_NoWrite))
pe_sec.Characteristics |= IMAGE_SCN_MEM_WRITE;
if (!(section.PageInfoFlags & xex::HvPageInfoFlags::PageInfoFlag_NoExecute))
pe_sec.Characteristics |= IMAGE_SCN_MEM_EXECUTE;
pe_sec.VirtualAddress = section.VirtualAddress;
pe_sec.VirtualSize = section.VirtualSize;
pe_sec.SizeOfRawData = section.SizeOfRawData;
pe_sec.PointerToRawData = section.PointerToRawData - xex_header_.SizeOfHeaders;
std::copy_n(section.SectionName, 8, pe_sec.Name);
xex_sections_.push_back(pe_sec);
}
}
if (basefile_is_pe())
{
// Try reading imports & exports
read_imports(file);
read_exports(file);
}
else
{
// No image to hash, treat it as valid...
valid_image_hash_ = true;
}
if (!security_info_.ImageInfo.ImportTableCount) {
// No import tables to hash, so treat it as valid...
valid_imports_hash_ = true;
}
load_error_ = uint32_t(XEXLoadError::Success);
return true;
}
// Reads import libraries & function info from XEX import table
bool XEXFile::read_imports(void* file)
{
if (!directory_entries_.count(XEX_HEADER_IMPORTS))
return false;
if (!directory_entries_[XEX_HEADER_IMPORTS])
return false;
seek(file, directory_entries_[XEX_HEADER_IMPORTS], 0);
xex_opt::XexImportDescriptor import_desc;
read(&import_desc, sizeof(xex_opt::XexImportDescriptor), 1, file);
// Seperate the library names in the name table
std::vector<std::string> import_libs;
std::string cur_lib = "";
for (uint32_t i = 0; i < import_desc.NameTableSize; i++)
{
if (!cur_lib.length())
{
// align to 4 bytes
if ((i % 4) != 0)
{
uint32_t align = 4 - (i % 4);
align = std::min(align, import_desc.NameTableSize - i); // don't let us align past end of nametable
i += align - 1; // minus 1 since for loop will add 1 to it too
seek(file, align, SEEK_CUR);
continue;
}
}
char name_char;
read(&name_char, 1, 1, file);
if (name_char == '\0' || name_char == '\xCD')
{
if (cur_lib.length())
{
import_libs.push_back(cur_lib);
cur_lib = "";
}
}
else
cur_lib += name_char;
}
// Get import table hashes ready for verifying...
// (Hash is of +4 into the table, ie skipping the TableSize field)
uint8_t hash_expected[20];
uint8_t hash[20];
std::copy_n(security_info_.ImageInfo.ImportDigest, 20, hash_expected);
valid_imports_hash_ = true;
// Read in each import library
for (uint32_t i = 0; i < import_desc.ModuleCount; i++)
{
auto table_addr = tell(file);
#ifndef IDALDR
// Check hash of table against expected hash
// TODO: this only seems to work for XEX2 atm, need to find method for XEX1...
if (valid_imports_hash_) // Only check import hashes while they're valid
{
xe::be<uint32_t> table_size;
read(&table_size, 4, 1, file);
auto table_data = std::make_unique<uint8_t[]>(table_size - 4);
read(table_data.get(), table_size - 4, 1, file);
ExCryptSha(table_data.get(), table_size - 4, 0, 0, 0, 0, hash, 20);
valid_imports_hash_ = ExCryptMemDiff(hash, hash_expected, 20) == 0;
// Copy the next tables hash from NextImportDigest
std::copy_n(table_data.get(), 20, hash_expected);
}
#endif
seek(file, table_addr, 0);
// Read in import table header
xex_opt::XexImportTable table_header;
if (header().Magic == MAGIC_XEX2D) {
// XEX2D has a slightly smaller import table, read it and copy stuff over...
xex_opt::xex2d::XexImportTable table_header_2d;
read(&table_header_2d, sizeof(xex_opt::xex2d::XexImportTable), 1, file);
// Copy over to normal table header
table_header.TableSize = table_header_2d.TableSize;
std::copy_n(table_header_2d.NextImportDigest, 0x14, table_header.NextImportDigest);
table_header.ModuleNumber = table_header_2d.ModuleNumber;
*(uint32_t*)&table_header.Version = _byteswap_ulong(*(uint32_t*)&table_header_2d.Version);
*(uint32_t*)&table_header.VersionMin = 0;
table_header.Unused = table_header_2d.Unused;
table_header.ModuleIndex = table_header_2d.ModuleIndex;
table_header.ImportCount = table_header_2d.ImportCount;
}
else
{
read(&table_header, sizeof(xex_opt::XexImportTable), 1, file);
*(uint32_t*)&table_header.Version = _byteswap_ulong(*(uint32_t*)&table_header.Version);
*(uint32_t*)&table_header.VersionMin = _byteswap_ulong(*(uint32_t*)&table_header.VersionMin);
}
auto& libname = import_libs.at(table_header.ModuleIndex);
if (!imports_.count(libname))
imports_[libname] = std::map<uint32_t, XEXFunction>();
if (!import_tables_.count(libname))
import_tables_[libname] = table_header;
for (uint32_t j = 0; j < table_header.ImportCount; j++)
{
xe::be<uint32_t> record_addr;
read(&record_addr, sizeof(uint32_t), 1, file);
if (!record_addr)
continue;
// Read import data from basefile
auto record_offset = pe_rva_to_offset(record_addr);
auto record_value = *(uint32_t*)(pe_data() + record_offset);
record_value = _byteswap_ulong(record_value);
auto record_type = (record_value & 0xFF000000) >> 24;
auto ordinal = record_value & 0xFFFF;
XEXFunction imp;
if (imports_[libname].count(ordinal))
imp = imports_[libname][ordinal];
if (record_type == 0)
{
// variable
imp.ThunkAddr = record_addr;
}
else if (record_type == 1)
{
// function
imp.FuncAddr = record_addr;
// have to rewrite code to set r3 & r4 like xorlosers loader does
// r3 = module index afaik
// r4 = ordinal
// important to note that basefiles extracted via xextool have this rewrite done already, but raw basefile from XEX doesn't!
// todo: find out how to add to imports window like xorloser loader...
*(uint32_t*)(pe_data() + record_offset + 0) = _byteswap_ulong(0x38600000 | table_header.ModuleIndex);
*(uint32_t*)(pe_data() + record_offset + 4) = _byteswap_ulong(0x38800000 | ordinal);
}
else // todo: fix this
dbgmsg("[+] %s import %d (@ 0x%X) unknown type %d!\n", libname.c_str(), ordinal, record_addr, record_type);
imports_[libname][ordinal] = imp;
}
// Seek to end of this import table
seek(file, table_addr + table_header.TableSize, 0);
}
// Handle callcap imports
if (directory_entries_.count(XEX_HEADER_CALLCAP_IMPORTS))
{
xex_opt::XexCallcapImports callcap;
std::copy_n(
reinterpret_cast<xex_opt::XexCallcapImports*>(xex_headers_.data() + directory_entries_[XEX_HEADER_CALLCAP_IMPORTS]),
1,
&callcap);
if (!callcap.BeginFunctionThunkAddress || !callcap.EndFunctionThunkAddress)
return true;
dbgmsg("[+] Naming callcap imports... (%X-%X)\n", uint32_t(callcap.BeginFunctionThunkAddress), uint32_t(callcap.EndFunctionThunkAddress));
for (auto& addr : { callcap.BeginFunctionThunkAddress, callcap.EndFunctionThunkAddress })
{
if (!addr)
continue;
uint32_t import_offset = pe_rva_to_offset(addr);
uint32_t info_1 = *(uint32_t*)(pe_data() + import_offset);
uint32_t info_2 = *(uint32_t*)(pe_data() + import_offset + 4);
info_1 = _byteswap_ulong(info_1);
info_2 = _byteswap_ulong(info_2);
auto ordinal_1 = info_1 & 0xFFFF;
auto ordinal_2 = info_2 & 0xFFFF;
auto moduleidx_1 = (info_1 & 0xFF0000) >> 16;
auto moduleidx_2 = (info_2 & 0xFF0000) >> 16;
// Sanity check the callcap info, values from first dword should match values in second
if (ordinal_1 != ordinal_2 || moduleidx_1 != moduleidx_2)
{
dbgmsg("[!] Invalid callcap at 0x%X? (%X %X %X %X)\n", addr, ordinal_1, ordinal_2, moduleidx_1, moduleidx_2);
continue;
}
// Not sure if it should always be xbdm or not...
std::string libname = "xbdm.xex";
if (import_libs.size() > moduleidx_1)
libname = import_libs.at(moduleidx_1);
if (!imports_.count(libname))
imports_[libname] = std::map<uint32_t, XEXFunction>();
XEXFunction imp;
if (imports_[libname].count(ordinal_1))
imp = imports_[libname][ordinal_1];
imp.ThunkAddr = addr;
imp.FuncAddr = addr;
*(uint32_t*)(pe_data() + import_offset + 0) = _byteswap_ulong(0x38600000 | moduleidx_1);
*(uint32_t*)(pe_data() + import_offset + 4) = _byteswap_ulong(0x38800000 | ordinal_1);
imports_[libname][ordinal_1] = imp;
}
}
return true;
}
// Reads function info defined inside XEX export table
bool XEXFile::read_exports(void* file)
{
uint32_t exports_va = security_info_.ImageInfo.ExportTableAddress;
if (xex_header_.Magic == MAGIC_XEX1 && directory_entries_.count(XEX_HEADER_EXPORTS_XEX1))
exports_va = directory_entries_[XEX_HEADER_EXPORTS_XEX1];
if (!exports_va)
return false;
auto export_table_offset = pe_rva_to_offset(exports_va);
xex_opt::HvImageExportTable export_table;
std::copy_n(
reinterpret_cast<const xex_opt::HvImageExportTable*>(pe_data() + export_table_offset), 1,
&export_table);
if (export_table.Magic[0] != XEX_HV_MAGIC_0 ||
export_table.Magic[1] != XEX_HV_MAGIC_HVE ||
export_table.Magic[2] != XEX_HV_MAGIC_2)
{
dbgmsg("[+] Export table magic is invalid! (0x%X 0x%X 0x%X)\n", export_table.Magic[0], export_table.Magic[1], export_table.Magic[2]);
return false;
}
dbgmsg("[+] Loading module exports...\n");
#ifdef IDALDR
char module_name[256];
get_root_filename(module_name, 256);
#endif
auto ordinal_addrs_va = exports_va + sizeof(xex_opt::HvImageExportTable);
auto ordinal_addrs_offset = export_table_offset + sizeof(xex_opt::HvImageExportTable);
for (uint32_t i = 0; i < export_table.Count; i++)
{
auto ordinal = export_table.Base + i;
XEXFunction exp;
if (exports_.count(ordinal))
exp = exports_[ordinal];
exp.ThunkAddr = (uint32_t)(ordinal_addrs_va + (i * 4));
exp.FuncAddr = *(uint32_t*)(pe_data() + ordinal_addrs_offset + (i * 4));
exp.FuncAddr = _byteswap_ulong(exp.FuncAddr);
if (!exp.FuncAddr)
continue;
exp.FuncAddr += (export_table.ImageBaseAddress << 16);
exports_[ordinal] = exp;
}
return true;
}
uint32_t XEXFile::verify_secinfo(void* file)
{
valid_signature_ = false;
valid_header_hash_ = false;
if (xex_header_.Magic != MAGIC_XEX2)
return 0; // TODO: figure out how to verify XEX1 etc...
#ifndef IDALDR
int imageinfo_offset = 8;
if (xex_header_.Magic == MAGIC_XEX2D)
imageinfo_offset = 4;
int imageinfo_size = sizeof(xex2::HvImageInfo);
switch (xex_header_.Magic) {
case MAGIC_XEX1:
imageinfo_size = sizeof(xex1::HvImageInfo);
break;
case MAGIC_XEX25:
imageinfo_size = sizeof(xex25::HvImageInfo);
break;
case MAGIC_XEX2D:
imageinfo_size = sizeof(xex2d::SecurityInfo) - 4; // probably wrong, doesn't matter since XEX2D signatures are null anyway
break;
}
// "XEX: XexpVerifyXexHeaders: SecurityInfo offset invalid\n";
uint32_t header_remainder = xex_header_.SizeOfHeaders - xex_header_.SecurityInfo;
bool valid_offset = true;
if (xex_header_.SecurityInfo > xex_header_.SizeOfHeaders || header_remainder < 4)
valid_offset = false;
// "XEX: XexpVerifyXexHeaders: SecurityInfo size invalid\n"
bool valid_size = true;
if (security_info_.Size < 0x184 || security_info_.Size > header_remainder)
valid_size = false;
uint8_t hash[20];
if (valid_offset && valid_size)
{
// Check signature validity
auto imageinfo = std::make_unique<uint8_t[]>(imageinfo_size);
seek(file, (uint64_t)xex_header_.SecurityInfo + imageinfo_offset, 0);
read(imageinfo.get(), imageinfo_size, 1, file);
ExCryptRotSumSha(imageinfo.get() + 0x100, imageinfo_size - 0x100, 0, 0, hash, 20);
auto* salt = "XBOX360XEX";
if (security_info_.ImageInfo.ImageFlags.RevocationCheckRequired)
salt = "XBOX360REV";
int pubkey_idx = 0;
for (; pubkey_idx < num_pubkeys; pubkey_idx++)
{
EXCRYPT_RSAPUB_2048 pubKey;
ExCryptBn_BeToLeKey((EXCRYPT_RSA*)&pubKey, pubkey_bytes[pubkey_idx], 0x110);
EXCRYPT_SIG tmp;
std::copy_n(reinterpret_cast<EXCRYPT_SIG*>(imageinfo.get()), 1, &tmp);
valid_signature_ = ExCryptBnQwBeSigVerify(&tmp, hash, (uint8_t*)salt, (EXCRYPT_RSA*)&pubKey);
if (valid_signature_)
{
signkey_index_ = pubkey_idx;
break;
}
}
// Check header hash
uint32_t imageinfo_end = xex_header_.SecurityInfo + imageinfo_offset + imageinfo_size;
uint32_t header_remainsize = xex_header_.SizeOfHeaders - imageinfo_end;
auto header_remainbytes = std::make_unique<uint8_t[]>(header_remainsize);
seek(file, imageinfo_end, 0);
read(header_remainbytes.get(), header_remainsize, 1, file);
auto xex_header_raw = std::make_unique<uint8_t[]>((uint64_t)xex_header_.SecurityInfo + 8);
seek(file, 0, 0);
read(xex_header_raw.get(), 1, (uint64_t)xex_header_.SecurityInfo + 8, file);
ExCryptSha(header_remainbytes.get(), header_remainsize, xex_header_raw.get(), xex_header_.SecurityInfo + 8, 0, 0, hash, 20);
valid_header_hash_ = ExCryptMemDiff(hash, security_info_.ImageInfo.HeaderHash, 20) == 0;
}
return valid_signature_ && valid_header_hash_;
#endif
return 0;
}
// Reads in the different XEX formats SecurityInfo into the XEX2 SecurityInfo struct
bool XEXFile::read_secinfo(void* file)
{
auto magic = xex_header_.Magic;
if (magic == MAGIC_XEX3F || magic == MAGIC_XEX0)
return false; // XEX3F/XEX0 doesn't have securityinfo header!
if (magic == MAGIC_XEX2)
{
seek(file, xex_header_.SecurityInfo, 0);
read(&security_info_, sizeof(xex2::SecurityInfo), 1, file);
*(uint32_t*)&security_info_.ImageInfo.ImageFlags = _byteswap_ulong(*(uint32_t*)&security_info_.ImageInfo.ImageFlags);
*(uint32_t*)&security_info_.AllowedMediaTypes = _byteswap_ulong(*(uint32_t*)&security_info_.AllowedMediaTypes);
return true;
}
// Not an XEX2 - have to "convert" them into XEX2's securityinfo format
// SecurityInfo.Size - always at SecurityInfo[0]
seek(file, xex_header_.SecurityInfo, 0);
// Special case for XEX2D as security info is formatted a lot differently there
if (magic == MAGIC_XEX2D)
{
xex2d::SecurityInfo secInfo2D;
read(&secInfo2D, sizeof(xex2d::SecurityInfo), 1, file);
memset(&security_info_, 0, sizeof(xex2::SecurityInfo));
security_info_.Size = secInfo2D.Size;
std::copy_n(secInfo2D.Signature, 0x100, security_info_.ImageInfo.Signature);
// HeaderHash
std::copy_n(secInfo2D.ImageHash, 0x14, security_info_.ImageInfo.ImageHash);
security_info_.ImageInfo.LoadAddress = secInfo2D.LoadAddress;
security_info_.ImageSize = secInfo2D.ImageSize;
// CurrentVersion
// LowestAcceptableVersion
security_info_.PageDescriptorCount = (uint32_t)secInfo2D.PageDescriptorCount;
*(uint32_t*)&security_info_.ImageInfo.ImageFlags = (uint32_t)secInfo2D.ImageFlags; // todo: convert flags on-the-fly?
return true;
}
read(&security_info_.Size, sizeof(uint32_t), 1, file);
// SecurityInfo.ImageSize - mostly at SecurityInfo[4]
seek(file, xex_header_.SecurityInfo + 4, 0);
read(&security_info_.ImageSize, sizeof(uint32_t), 1, file);
// Read fields common to all XEX versions
// TODO: find some nicer way to handle all this!
std::map<uint32_t, size_t> offsets;
{
#define READ_FIELD(n, sz) offsets = { \
{MAGIC_XEX1, offsetof(xex1::SecurityInfo, n)}, \
{MAGIC_XEX25, offsetof(xex25::SecurityInfo, n)}, \
}; \
seek(file, xex_header_.SecurityInfo + offsets[magic], 0); \
read(&security_info_.n, sz, 1, file);
READ_FIELD(ImageInfo.Signature, 0x100);
READ_FIELD(ImageInfo.ImageFlags, sizeof(uint32_t));
READ_FIELD(ImageInfo.LoadAddress, sizeof(uint32_t));
READ_FIELD(ImageInfo.ImageHash, 0x14);
READ_FIELD(ImageInfo.ImportDigest, 0x14);
READ_FIELD(ImageInfo.ImageKey, 0x10);
READ_FIELD(AllowedMediaTypes, sizeof(xex::AllowedMediaTypes));
READ_FIELD(PageDescriptorCount, sizeof(uint32_t));
*(uint32_t*)&security_info_.ImageInfo.ImageFlags = _byteswap_ulong(*(uint32_t*)&security_info_.ImageInfo.ImageFlags);
*(uint32_t*)&security_info_.AllowedMediaTypes = _byteswap_ulong(*(uint32_t*)&security_info_.AllowedMediaTypes);
#undef READ_FIELD
}
if (magic == MAGIC_XEX25)
{
// Read fields shared between XEX2 and XEX25
auto offset_exportTable = offsetof(xex25::SecurityInfo, ImageInfo.ExportTableAddress);
seek(file, xex_header_.SecurityInfo + offset_exportTable, 0);
read(&security_info_.ImageInfo.ExportTableAddress, 1, sizeof(uint32_t), file);
}
else if (magic == MAGIC_XEX1)
{
// Read fields shared between XEX2 and XEX1
auto offset_mediaId = offsetof(xex1::SecurityInfo, ImageInfo.MediaID);
seek(file, xex_header_.SecurityInfo + offset_mediaId, 0);
read(&security_info_.ImageInfo.MediaID, 0x10, 1, file);
auto offset_gameRegion = offsetof(xex1::SecurityInfo, ImageInfo.GameRegion);
seek(file, xex_header_.SecurityInfo + offset_gameRegion, 0);
read(&security_info_.ImageInfo.GameRegion, sizeof(xex::GameRegion), 1, file);
}
return true;
}
// Reads (and optionally decrypts) the basefile from the XEX in "raw" format
bool XEXFile::read_basefile_raw(void* file, bool encrypted)
{
pe_data_.resize(image_size());
seek(file, xex_header_.SizeOfHeaders, 0);
read(pe_data_.data(), 1, data_length_, file);
if (encrypted)
{
AES_ctx aes;
uint8_t iv[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
AES_init_ctx_iv(&aes, session_key_, iv);
AES_CBC_decrypt_buffer(&aes, pe_data_.data(), data_length_);
}
return true;
}
// Reads (and optionally decrypts) the basefile from the XEX in uncompressed format
bool XEXFile::read_basefile_uncompressed(void* file, bool encrypted)
{
if (!data_descriptor_)
{
load_error_ = uint32_t(XEXLoadError::MissingDataDescriptor);
return false;
}
int num_blocks = (data_descriptor_->Size - 8) / 8;
auto xex_blocks = std::make_unique<xex_opt::XexRawDataDescriptor[]>(num_blocks);
std::copy_n(
reinterpret_cast<xex_opt::XexRawDataDescriptor*>(xex_headers_.data() + directory_entries_[XEX_FILE_DATA_DESCRIPTOR_HEADER] + 8),
num_blocks,
xex_blocks.get());
AES_ctx aes;
uint8_t iv[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
if (encrypted)
AES_init_ctx_iv(&aes, session_key_, iv);
pe_data_.resize(image_size());
uint32_t position = 0;
seek(file, xex_header_.SizeOfHeaders, 0);
for (int i = 0; i < num_blocks; i++)
{
// if it's the first block & encrypted, we'll test-decrypt the first 16 bytes
// so we can test if it decrypted properly with this key, without needing to process the entire block
if (i == 0 && encrypted)
{
// Read first 16 bytes of block and decrypt
auto pos = tell(file);
read(pe_data_.data(), 1, 0x10, file);
AES_ECB_decrypt(&aes, pe_data_.data());
#ifdef IDALDR
// Check basefile header - needed for IDALDR since we don't compute image hash for that
if (!basefile_is_valid())
{
pe_data_.clear();
load_error_ = uint32_t(XEXLoadError::InvalidBaseFile);
return false;
}
#endif
// Reinit AES & seek back to start of block
AES_init_ctx_iv(&aes, session_key_, iv);
seek(file, pos, 0);
}
read(pe_data_.data() + position, 1, xex_blocks[i].DataSize, file);
if (encrypted)
AES_CBC_decrypt_buffer(&aes, pe_data_.data() + position, xex_blocks[i].DataSize);
position += xex_blocks[i].DataSize;
memset(pe_data_.data() + position, 0, xex_blocks[i].ZeroSize);
position += xex_blocks[i].ZeroSize;
}
// todo: verify block size sum == ImageSize ?
return true;
}
// Reads (and optionally decrypts) the basefile from the XEX in LZX-compressed format
bool XEXFile::read_basefile_compressed(void* file, bool encrypted)
{
AES_ctx aes;
if (encrypted)
{
uint8_t iv[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
AES_init_ctx_iv(&aes, session_key_, iv);
}
// read windowsize & first block from file_data_descriptor header
xex_opt::XexCompressedDataDescriptor compression_info =
*reinterpret_cast<xex_opt::XexCompressedDataDescriptor*>(
xex_headers_.data() + directory_entries_[XEX_FILE_DATA_DESCRIPTOR_HEADER] + 8);
auto* cur_block = &compression_info.FirstDescriptor;
// Alloc memory for the PE
pe_data_.resize(image_size());
// LZX init...
std::unique_ptr<uint8_t[]> comp_buffer = std::make_unique<uint8_t[]>(data_length_);
if (!comp_buffer || !comp_buffer.get())
{
load_error_ = uint32_t(XEXLoadError::AllocFailed);
dbgmsg("[!] Error: failed to allocate decompression buffer!?\n");
return false;
}
uint8_t* d = comp_buffer.get();
int retcode = 0;
// Start decompressing
seek(file, xex_header_.SizeOfHeaders, 0);
xex_opt::XexDataDescriptor next_block;
uint8_t* block_data = 0;
while (cur_block->Size)
{
block_data = (uint8_t*)malloc(cur_block->Size);
read(block_data, 1, cur_block->Size, file);
if (encrypted)
AES_CBC_decrypt_buffer(&aes, block_data, cur_block->Size);
// Check hash of the block - don't want to attempt decompressing invalid data!
uint8_t sha_hash[0x14];
ExCryptSha(block_data, cur_block->Size, nullptr, 0, nullptr, 0, sha_hash, sizeof(sha_hash));
if (memcmp(sha_hash, cur_block->DataDigest, 0x14) != 0)
{
retcode = 2;
load_error_ = uint32_t(XEXLoadError::BadBlockHash);
goto end;
}
std::copy_n(reinterpret_cast<xex_opt::XexDataDescriptor*>(block_data), 1, &next_block);
uint8_t* p = block_data + sizeof(xex_opt::XexDataDescriptor);
while (true)
{
uint16_t comp_size = *(uint16_t*)p;
p += 2;
if (!comp_size)
break;
comp_size = _byteswap_ushort(comp_size);
if (comp_size > 0x9800) // sanity check: shouldn't be above 0x9800
{
retcode = 1;
load_error_ = uint32_t(XEXLoadError::BadBlockSize);
goto end;
}
// Read in LZX buffer
std::copy_n(p, comp_size, d);
p += comp_size;
d += comp_size;
}
std::copy_n(reinterpret_cast<xex_opt::XexDataDescriptor*>(&next_block), 1, cur_block);
free(block_data);
block_data = 0;
}
retcode = lzx_decompress(comp_buffer.get(), d - comp_buffer.get(), pe_data_.data(), pe_data_.size(), compression_info.WindowSize, nullptr, 0);
end:
if (block_data)
free(block_data);
if (retcode != 0)
{
load_error_ = retcode;
dbgmsg("[!] read_basefile_decompressed error code = %d!\n", retcode);
}
return retcode == 0;
}
// TODO: fix this to work with older XEX formats
uint32_t XEXFile::xex_va_to_offset(uint32_t va)
{
if (!data_descriptor_)
return false;
auto comp_format = data_descriptor_->DataFormat();
// convert VA to RVA if necessary
if (va >= base_address())
va -= base_address();
if (comp_format == xex_opt::XexDataFormat::None)
return xex_header_.SizeOfHeaders + va;
if (comp_format != xex_opt::XexDataFormat::Raw)
return 0; // can't get offset for compressed XEXs
int num_blocks = (data_descriptor_->Size - 8) / 8;
auto xex_blocks = std::make_unique<xex_opt::XexRawDataDescriptor[]>(num_blocks);
std::copy_n(
reinterpret_cast<xex_opt::XexRawDataDescriptor*>(xex_headers_.data() + directory_entries_[XEX_FILE_DATA_DESCRIPTOR_HEADER] + 8),
num_blocks,
xex_blocks.get());
// Uncompressed blocks can have any number of zeroes appended to them, instead of these zeroes being stored in the XEX
// To locate the RVA just track the block size + zero size together, and then return its proper address without zeroes.
uint32_t position = 0;
uint32_t real_position = 0;
for (int i = 0; i < num_blocks; i++)
{
const auto& block = xex_blocks[i];
auto block_end = position + block.DataSize;
if (va >= position && va < block_end)
return xex_header_.SizeOfHeaders + real_position + (va - position);
position += block.DataSize + block.ZeroSize;
real_position += block.DataSize;
}
return 0;
}
// TODO: fix this to work with older XEX formats
uint32_t XEXFile::xex_offset_to_va(uint32_t offset)
{
if (!data_descriptor_)
return false;
auto comp_format = data_descriptor_->DataFormat();
if (xex_header_.SizeOfHeaders > offset)
return 0;
offset -= xex_header_.SizeOfHeaders;
if (comp_format == xex_opt::XexDataFormat::None)
return base_address() + offset;
if (comp_format != xex_opt::XexDataFormat::Raw)
return 0; // can't get offset for compressed XEXs
int num_blocks = (data_descriptor_->Size - 8) / 8;
auto xex_blocks = std::make_unique<xex_opt::XexRawDataDescriptor[]>(num_blocks);