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Add baseband caching, fix UAF bug

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* Fixes #106
 * Fixes #107
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Cryptiiiic 2022-10-08 23:21:20 -07:00
parent 93b74bdefe
commit 077c03fa83
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GPG key ID: 6027B509EFE3A76B
3 changed files with 146 additions and 54 deletions
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2
external/tsschecker vendored

@ -1 +1 @@
Subproject commit ad4c0d92f42e2cd2e90efdb38ed7fc11dd356656
Subproject commit 4734e9a597dab98142b84829d88b6c0a24e98377

193
src/futurerestore.cpp
View file

@ -1941,10 +1941,27 @@ void futurerestore::downloadLatestFirmwareComponents() {
void futurerestore::downloadLatestBaseband() {
auto manifeststr = getLatestManifest();
auto pathStr = getPathOfElementInManifest("BasebandFirmware", manifeststr, getDeviceBoardNoCopy(), 0);
// TODO: Baseband caching. How on earth does basebandfirmware digest work?
info("Downloading Baseband\n\n");
retassure(!downloadPartialzip(getLatestFirmwareUrl(), pathStr, basebandTempPath.c_str()),
"Could not download baseband\n");
auto *bbcfgDigestString = getBBCFGDigestInManifest(manifeststr, getDeviceBoardNoCopy(), 0);
uint32_t basebandSize;
char *basebandData = readBaseband(basebandTempPath, basebandData, reinterpret_cast<size_t *>(&basebandSize));
bool cached = false;
if(bbcfgDigestString != nullptr && basebandData != nullptr) {
const char *bbcfgData = extractZipFileToString(basebandData, "bbcfg.mbn", &basebandSize);
if(bbcfgData != nullptr) {
auto *hash = getSHABuffer((char *) bbcfgData, basebandSize, ((_client->device->chip_id < 0x8010) ? 3 : 1));
if(hash && bbcfgDigestString && !memcmp(bbcfgDigestString, hash, ((_client->device->chip_id < 0x8010) ? 20 : 32))) {
info("Using cached Baseband.\n");
safeFree(bbcfgDigestString);
safeFree(hash);
cached = true;
}
}
}
if(!cached) {
info("Downloading Baseband\n\n");
retassure(!downloadPartialzip(getLatestFirmwareUrl(), pathStr, basebandTempPath.c_str()),
"Could not download baseband\n");
}
saveStringToFile(manifeststr, basebandManifestTempPath);
setBasebandPath(basebandTempPath);
setBasebandManifestPath(basebandManifestTempPath);
@ -2128,6 +2145,60 @@ void futurerestore::loadBaseband(std::string basebandPath) {
__func__, basebandPath.c_str());
}
char *futurerestore::readBaseband(std::string basebandPath, char *data, size_t *sz) {
std::ifstream basebandFileStream(basebandPath, std::ios::binary | std::ios::in | std::ios::ate);
if(!basebandFileStream.good()) {
return nullptr;
}
size_t basebandSize = basebandFileStream.tellg();
basebandFileStream.seekg(0, std::ios_base::beg);
uint64_t *basebandData = nullptr;
std::allocator<uint8_t> alloc;
basebandData = (uint64_t *)alloc.allocate(basebandSize);
if(!basebandData) {
return nullptr;
}
basebandFileStream.read((char *)basebandData, (std::streamsize)basebandSize);
if(!basebandFileStream.good()) {
return nullptr;
}
*sz = basebandSize;
return reinterpret_cast<char *>(basebandData);
}
unsigned char *futurerestore::getSHABuffer(char *data, size_t dataSize, int type) {
std::allocator<uint8_t> alloc;
auto *fileHash = (unsigned char *)nullptr;
switch(type) {
case 0:
fileHash = (unsigned char *) alloc.allocate(48);
memset(fileHash, 0, 48);
SHA384((const unsigned char*)data, (unsigned int)dataSize, fileHash);
break;
case 1:
fileHash = (unsigned char *) alloc.allocate(32);
memset(fileHash, 0, 32);
SHA256((const unsigned char*)data, (unsigned int)dataSize, fileHash);
break;
case 2:
fileHash = (unsigned char *) alloc.allocate(64);
memset(fileHash, 0, 64);
SHA512((const unsigned char*)data, (unsigned int)dataSize, fileHash);
break;
case 3:
fileHash = (unsigned char *) alloc.allocate(20);
memset(fileHash, 0, 20);
SHA1((const unsigned char*)data, (unsigned int)dataSize, fileHash);
break;
default:
fileHash = (unsigned char *) alloc.allocate(48);
memset(fileHash, 0, 48);
SHA384((const unsigned char*)data, (unsigned int)dataSize, fileHash);
break;
}
return fileHash;
}
unsigned char *futurerestore::getSHA(const std::string& filePath, int type) {
std::ifstream fileStream(filePath, std::ios::binary | std::ios::in | std::ios::ate);
if(!fileStream.good()) {
@ -2153,30 +2224,7 @@ unsigned char *futurerestore::getSHA(const std::string& filePath, int type) {
__func__, filePath.c_str(), dataSize);
return nullptr;
}
auto *fileHash = (unsigned char *)nullptr;
switch(type) {
case 0:
fileHash = (unsigned char *) alloc.allocate(48);
SHA384((const unsigned char*)data, (unsigned int)dataSize, fileHash);
break;
case 1:
fileHash = (unsigned char *) alloc.allocate(32);
SHA256((const unsigned char*)data, (unsigned int)dataSize, fileHash);
break;
case 2:
fileHash = (unsigned char *) alloc.allocate(64);
SHA512((const unsigned char*)data, (unsigned int)dataSize, fileHash);
break;
case 3:
fileHash = (unsigned char *) alloc.allocate(20);
SHA1((const unsigned char*)data, (unsigned int)dataSize, fileHash);
break;
default:
fileHash = (unsigned char *) alloc.allocate(48);
SHA384((const unsigned char*)data, (unsigned int)dataSize, fileHash);
break;
}
return fileHash;
return getSHABuffer(data, dataSize, type);
}
#pragma mark static methods
@ -2343,6 +2391,31 @@ unsigned char *futurerestore::getDigestOfElementInManifest(const char *element,
return (unsigned char *)digestStr;
}
unsigned char *futurerestore::getBBCFGDigestInManifest(const char *manifeststr, const char *boardConfig,
int isUpdateInstall) {
char *digestStr = nullptr;
ptr_smart<plist_t> buildmanifest(NULL, plist_free);
uint64_t size;
plist_from_xml(manifeststr, (uint32_t) strlen(manifeststr), &buildmanifest);
if (plist_t identity = getBuildidentityWithBoardconfig(buildmanifest._p, boardConfig, isUpdateInstall)) {
if (plist_t manifest = plist_dict_get_item(identity, "Manifest")) {
if (plist_t elem = plist_dict_get_item(manifest, "BasebandFirmware")) {
if (plist_t path = plist_dict_get_item(elem, "BBCFG-DownloadDigest")) {
if (plist_get_data_val(path, &digestStr, &size), digestStr) {
goto noerror;
}
}
}
}
}
return nullptr;
noerror:
return (unsigned char *)digestStr;
}
bool
futurerestore::elemExists(const char *element, const char *manifeststr, const char *boardConfig, int isUpdateInstall) {
char *pathStr = nullptr;
@ -2394,27 +2467,36 @@ void futurerestore::checkForUpdates() {
bool fail = false;
char *buffer = nullptr;
uint32_t sz = 0;
uint32_t sz2 = 0;
if(download_to_buffer(url.c_str(), &buffer, &sz)) {
fail = true;
} else {
std::string num_str = extractZipFileToString(buffer, "latest_build_num.txt", sz);
if(num_str.empty()) {
sz2 = sz;
const char *tmp = extractZipFileToString(buffer, "latest_build_num.txt", &sz);
if(!tmp) {
fail = true;
} else {
this->latest_num = num_str;
std::string num_str = std::string(tmp);
if (num_str.empty()) {
fail = true;
} else {
this->latest_num = num_str;
}
}
}
if(download_to_buffer(url.c_str(), &buffer, &sz)) {
const char *tmp = extractZipFileToString(buffer, "latest_build_sha.txt", &sz2);
if(!tmp) {
fail = true;
} else {
std::string sha_str = extractZipFileToString(buffer, "latest_build_sha.txt", sz);
if(sha_str.empty()) {
std::string sha_str = std::string(tmp);
if (sha_str.empty()) {
fail = true;
} else {
this->latest_sha = sha_str;
}
}
if(this->latest_num.empty() || this->latest_sha.empty()) {
if(this->latest_num.empty() || this->latest_sha.empty() || fail) {
info("ERROR: failed to check for futurerestore updates! continuing...\n");
return;
}
@ -2422,7 +2504,7 @@ void futurerestore::checkForUpdates() {
if(std::equal(this->current_sha.begin(), this->current_sha.end(), this->latest_sha.begin())) {
updated = true;
} else {
if(std::stoi(this->current_num) < std::stoi(this->latest_num)) {
if (std::stoi(this->current_num) < std::stoi(this->latest_num)) {
info("Error: Futurerestore is outdated! Please download the latest futurerestore! exitting...\n");
exit(-1);
} else {
@ -2434,47 +2516,54 @@ void futurerestore::checkForUpdates() {
}
}
std::string futurerestore::extractZipFileToString(char *zip_buffer, const char *file, uint32_t sz) {
bool fail = false;
#endif
const char *futurerestore::extractZipFileToString(char *zip_buffer, const char *file, uint32_t *sz) {
std::allocator<uint8_t> alloc;
std::string str;
zip_error_t *err = nullptr;
zip_source_t *target_source_zip = zip_source_buffer_create(zip_buffer, sz, 0, err);
unsigned char *target_buffer = nullptr;
zip_source_t *target_source_zip = zip_source_buffer_create(zip_buffer, *sz, 0, err);
if(err != nullptr) {
return nullptr;
}
if(target_source_zip == nullptr) {
return nullptr;
}
zip_t *target_zip = zip_open_from_source(target_source_zip, 0, err);
if(err != nullptr) {
info("err: %d %s\n", __LINE__, zip_error_strerror(err));
}
if(target_zip == nullptr) {
fail = true;
return nullptr;
} else {
int idx = zip_name_locate(target_zip, file, 0);
if(idx < 0) {
fail = true;
return nullptr;
} else {
struct zip_stat zstat;
zip_stat_init(&zstat);
if(zip_stat_index(target_zip, idx, 0, &zstat) != 0) {
fail = true;
return nullptr;
} else {
struct zip_file* target_file = zip_fopen_index(target_zip, idx, 0);
if (target_file == nullptr) {
fail = true;
return nullptr;
} else {
unsigned char *target_buffer = (unsigned char*)alloc.allocate(zstat.size+1);
target_buffer = (unsigned char*)alloc.allocate(zstat.size+1);
if(target_buffer == nullptr) {
fail = true;
return nullptr;
} else {
if (zip_fread(target_file, target_buffer, zstat.size) != zstat.size) {
fail = true;
return nullptr;
} else {
target_buffer[zstat.size] = '\0';
str = std::string(reinterpret_cast<const char *>(target_buffer));
*sz = zstat.size;
}
}
free(target_buffer);
}
zip_fclose(target_file);
}
}
}
return fail ? "" : str;
return (const char *)target_buffer;
}
#endif

5
src/futurerestore.hpp
View file

@ -154,6 +154,8 @@ public:
void loadKernel(std::string kernelPath);
void loadSep(std::string sepPath);
void loadBaseband(std::string basebandPath);
char *readBaseband(std::string basebandPath, char *data, size_t *sz);
unsigned char *getSHABuffer(char *data, size_t dataSize, int type = 0);
unsigned char *getSHA(const std::string& filePath, int type = 0);
void setCustomLatest(std::string version){_customLatest = version; _useCustomLatest = true;}
@ -189,9 +191,10 @@ public:
static void saveStringToFile(std::string str, std::string path);
static char *getPathOfElementInManifest(const char *element, const char *manifeststr, const char *boardConfig, int isUpdateInstall);
static unsigned char *getDigestOfElementInManifest(const char *element, const char *manifeststr, const char *boardConfig, int isUpdateInstall);
static unsigned char *getBBCFGDigestInManifest(const char *manifeststr, const char *boardConfig, int isUpdateInstall);
static bool elemExists(const char *element, const char *manifeststr, const char *boardConfig, int isUpdateInstall);
static std::string getGeneratorFromSHSH2(plist_t shsh2);
static std::string extractZipFileToString(char *zip_buffer, const char *file, uint32_t sz);
static const char *extractZipFileToString(char *zip_buffer, const char *file, uint32_t *sz);
};