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Diffstat (limited to 'crypto/ext4crypt/Ext4CryptPie.cpp')
| -rw-r--r-- | crypto/ext4crypt/Ext4CryptPie.cpp | 861 |
1 files changed, 861 insertions, 0 deletions
diff --git a/crypto/ext4crypt/Ext4CryptPie.cpp b/crypto/ext4crypt/Ext4CryptPie.cpp new file mode 100644 index 000000000..615229ea9 --- /dev/null +++ b/crypto/ext4crypt/Ext4CryptPie.cpp @@ -0,0 +1,861 @@ +/* + * Copyright (C) 2015 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "Ext4CryptPie.h" + +#include "KeyStorage4.h" +#include "KeyUtil.h" +#include "Utils.h" +#include "Decrypt.h" +//#include "VoldUtil.h" + +#include <algorithm> +#include <map> +#include <set> +#include <sstream> +#include <string> +#include <vector> + +#include <dirent.h> +#include <errno.h> +#include <fcntl.h> +#include <unistd.h> +#include <limits.h> +#include <selinux/android.h> +#include <sys/mount.h> +#include <sys/stat.h> +#include <sys/types.h> + +#include <private/android_filesystem_config.h> + +//#include "android/os/IVold.h" + +//#include "cryptfs.h" + +#define EMULATED_USES_SELINUX 0 +#define MANAGE_MISC_DIRS 0 + +#include <cutils/fs.h> +#include <cutils/properties.h> + +#include <ext4_utils/ext4_crypt.h> +#include <keyutils.h> + +#include <android-base/file.h> +//#include <android-base/logging.h> +#include <android-base/properties.h> +#include <android-base/stringprintf.h> + +#include <iostream> +#define LOG(x) std::cout +#define PLOG(x) std::cout +#define DATA_MNT_POINT "/data" + +using android::base::StringPrintf; +using android::base::WriteStringToFile; +using android::vold::kEmptyAuthentication; +using android::vold::KeyBuffer; + +// Store main DE raw ref / policy +std::string de_raw_ref; +// Map user ids to key references +std::map<userid_t, std::string> s_de_key_raw_refs; +std::map<userid_t, std::string> s_ce_key_raw_refs; +// TODO abolish this map, per b/26948053 +std::map<userid_t, KeyBuffer> s_ce_keys; + +namespace { + +struct PolicyKeyRef { + std::string contents_mode; + std::string filenames_mode; + std::string key_raw_ref; +}; + +const std::string device_key_dir = std::string() + DATA_MNT_POINT + e4crypt_unencrypted_folder; +const std::string device_key_path = device_key_dir + "/key"; +const std::string device_key_temp = device_key_dir + "/temp"; + +const std::string user_key_dir = std::string() + DATA_MNT_POINT + "/misc/vold/user_keys"; +const std::string user_key_temp = user_key_dir + "/temp"; +const std::string prepare_subdirs_path = "/system/bin/vold_prepare_subdirs"; + +const std::string systemwide_volume_key_dir = + std::string() + DATA_MNT_POINT + "/misc/vold/volume_keys"; + +bool s_global_de_initialized = false; + +// Some users are ephemeral, don't try to wipe their keys from disk +std::set<userid_t> s_ephemeral_users; + +} + +static bool e4crypt_is_emulated() { + return property_get_bool("persist.sys.emulate_fbe", false); +} + +static const char* escape_empty(const std::string& value) { + return value.empty() ? "null" : value.c_str(); +} + +static std::string get_de_key_path(userid_t user_id) { + return StringPrintf("%s/de/%d", user_key_dir.c_str(), user_id); +} + +static std::string get_ce_key_directory_path(userid_t user_id) { + return StringPrintf("%s/ce/%d", user_key_dir.c_str(), user_id); +} + +// Returns the keys newest first +static std::vector<std::string> get_ce_key_paths(const std::string& directory_path) { + auto dirp = std::unique_ptr<DIR, int (*)(DIR*)>(opendir(directory_path.c_str()), closedir); + if (!dirp) { + PLOG(ERROR) << "Unable to open ce key directory: " + directory_path << std::endl; + return std::vector<std::string>(); + } + std::vector<std::string> result; + for (;;) { + errno = 0; + auto const entry = readdir(dirp.get()); + if (!entry) { + if (errno) { + PLOG(ERROR) << "Unable to read ce key directory: " + directory_path << std::endl; + return std::vector<std::string>(); + } + break; + } + if (entry->d_type != DT_DIR || entry->d_name[0] != 'c') { + LOG(DEBUG) << "Skipping non-key " << entry->d_name << std::endl; + continue; + } + result.emplace_back(directory_path + "/" + entry->d_name); + } + std::sort(result.begin(), result.end()); + std::reverse(result.begin(), result.end()); + return result; +} + +static std::string get_ce_key_current_path(const std::string& directory_path) { + return directory_path + "/current"; +} + +/*static bool get_ce_key_new_path(const std::string& directory_path, + const std::vector<std::string>& paths, + std::string *ce_key_path) { + if (paths.empty()) { + *ce_key_path = get_ce_key_current_path(directory_path); + return true; + } + for (unsigned int i = 0; i < UINT_MAX; i++) { + auto const candidate = StringPrintf("%s/cx%010u", directory_path.c_str(), i); + if (paths[0] < candidate) { + *ce_key_path = candidate; + return true; + } + } + return false; +}*/ + +// Discard all keys but the named one; rename it to canonical name. +// No point in acting on errors in this; ignore them. +static void fixate_user_ce_key(const std::string& directory_path, const std::string &to_fix, + const std::vector<std::string>& paths) { + for (auto const other_path: paths) { + if (other_path != to_fix) { + android::vold::destroyKey(other_path); + } + } + auto const current_path = get_ce_key_current_path(directory_path); + if (to_fix != current_path) { + LOG(DEBUG) << "Renaming " << to_fix << " to " << current_path << std::endl; + if (rename(to_fix.c_str(), current_path.c_str()) != 0) { + PLOG(WARNING) << "Unable to rename " << to_fix << " to " << current_path << std::endl; + } + } +} + +static bool read_and_fixate_user_ce_key(userid_t user_id, + const android::vold::KeyAuthentication& auth, + KeyBuffer *ce_key) { + auto const directory_path = get_ce_key_directory_path(user_id); + auto const paths = get_ce_key_paths(directory_path); + for (auto const ce_key_path: paths) { + LOG(DEBUG) << "Trying user CE key " << ce_key_path << std::endl; + if (android::vold::retrieveKey(ce_key_path, auth, ce_key)) { + LOG(DEBUG) << "Successfully retrieved key" << std::endl; + fixate_user_ce_key(directory_path, ce_key_path, paths); + return true; + } + } + LOG(ERROR) << "Failed to find working ce key for user " << user_id << std::endl; + return false; +} + +static bool read_and_install_user_ce_key(userid_t user_id, + const android::vold::KeyAuthentication& auth) { + if (s_ce_key_raw_refs.count(user_id) != 0) return true; + KeyBuffer ce_key; + if (!read_and_fixate_user_ce_key(user_id, auth, &ce_key)) return false; + std::string ce_raw_ref; + if (!android::vold::installKey(ce_key, &ce_raw_ref)) return false; + s_ce_keys[user_id] = std::move(ce_key); + s_ce_key_raw_refs[user_id] = ce_raw_ref; + LOG(DEBUG) << "Installed ce key for user " << user_id << std::endl; + return true; +} + +static bool prepare_dir(const std::string& dir, mode_t mode, uid_t uid, gid_t gid) { + LOG(DEBUG) << "Preparing: " << dir << std::endl; + if (fs_prepare_dir(dir.c_str(), mode, uid, gid) != 0) { + PLOG(ERROR) << "Failed to prepare " << dir << std::endl; + return false; + } + return true; +} + +/*static bool destroy_dir(const std::string& dir) { + LOG(DEBUG) << "Destroying: " << dir; + if (rmdir(dir.c_str()) != 0 && errno != ENOENT) { + PLOG(ERROR) << "Failed to destroy " << dir; + return false; + } + return true; +}*/ + +// NB this assumes that there is only one thread listening for crypt commands, because +// it creates keys in a fixed location. +static bool create_and_install_user_keys(userid_t user_id, bool create_ephemeral) { + /*KeyBuffer de_key, ce_key; + if (!android::vold::randomKey(&de_key)) return false; + if (!android::vold::randomKey(&ce_key)) return false; + if (create_ephemeral) { + // If the key should be created as ephemeral, don't store it. + s_ephemeral_users.insert(user_id); + } else { + auto const directory_path = get_ce_key_directory_path(user_id); + if (!prepare_dir(directory_path, 0700, AID_ROOT, AID_ROOT)) return false; + auto const paths = get_ce_key_paths(directory_path); + std::string ce_key_path; + if (!get_ce_key_new_path(directory_path, paths, &ce_key_path)) return false; + if (!android::vold::storeKeyAtomically(ce_key_path, user_key_temp, + kEmptyAuthentication, ce_key)) return false; + fixate_user_ce_key(directory_path, ce_key_path, paths); + // Write DE key second; once this is written, all is good. + if (!android::vold::storeKeyAtomically(get_de_key_path(user_id), user_key_temp, + kEmptyAuthentication, de_key)) return false; + } + std::string de_raw_ref; + if (!android::vold::installKey(de_key, &de_raw_ref)) return false; + s_de_key_raw_refs[user_id] = de_raw_ref; + std::string ce_raw_ref; + if (!android::vold::installKey(ce_key, &ce_raw_ref)) return false; + s_ce_keys[user_id] = ce_key; + s_ce_key_raw_refs[user_id] = ce_raw_ref; + LOG(DEBUG) << "Created keys for user " << user_id;*/ + LOG(DEBUG) << "TWRP not doing create_and_install_user_keys\n"; + return true; +} + +bool lookup_key_ref(const std::map<userid_t, std::string>& key_map, userid_t user_id, + std::string* raw_ref) { + auto refi = key_map.find(user_id); + if (refi == key_map.end()) { + LOG(ERROR) << "Cannot find key for " << user_id << std::endl; + return false; + } + *raw_ref = refi->second; + return true; +} + +static void get_data_file_encryption_modes(PolicyKeyRef* key_ref) { + /*struct fstab_rec* rec = fs_mgr_get_entry_for_mount_point(fstab_default, DATA_MNT_POINT); + char const* contents_mode = strdup("ice"); + char const* filenames_mode = strdup("aes-256-heh"); + fs_mgr_get_file_encryption_modes(rec, &contents_mode, &filenames_mode); + key_ref->contents_mode = contents_mode; + key_ref->filenames_mode = filenames_mode;*/ + LOG(INFO) << "contents mode '" << android::base::GetProperty("fbe.contents", "aes-256-xts") << "' filenames '" << android::base::GetProperty("fbe.filenames", "aes-256-heh") << "'\n"; + key_ref->contents_mode = + android::base::GetProperty("fbe.contents", "aes-256-xts"); + key_ref->filenames_mode = + android::base::GetProperty("fbe.filenames", "aes-256-heh"); +} + +static bool ensure_policy(const PolicyKeyRef& key_ref, const std::string& path) { + return e4crypt_policy_ensure(path.c_str(), key_ref.key_raw_ref.data(), + key_ref.key_raw_ref.size(), key_ref.contents_mode.c_str(), + key_ref.filenames_mode.c_str()) == 0; +} + +static bool is_numeric(const char* name) { + for (const char* p = name; *p != '\0'; p++) { + if (!isdigit(*p)) return false; + } + return true; +} + +static bool load_all_de_keys() { + auto de_dir = user_key_dir + "/de"; + auto dirp = std::unique_ptr<DIR, int (*)(DIR*)>(opendir(de_dir.c_str()), closedir); + if (!dirp) { + PLOG(ERROR) << "Unable to read de key directory" << std::endl; + return false; + } + for (;;) { + errno = 0; + auto entry = readdir(dirp.get()); + if (!entry) { + if (errno) { + PLOG(ERROR) << "Unable to read de key directory" << std::endl; + return false; + } + break; + } + if (entry->d_type != DT_DIR || !is_numeric(entry->d_name)) { + LOG(DEBUG) << "Skipping non-de-key " << entry->d_name << std::endl; + continue; + } + userid_t user_id = std::stoi(entry->d_name); + if (s_de_key_raw_refs.count(user_id) == 0) { + auto key_path = de_dir + "/" + entry->d_name; + KeyBuffer key; + if (!android::vold::retrieveKey(key_path, kEmptyAuthentication, &key)) return false; + std::string raw_ref; + if (!android::vold::installKey(key, &raw_ref)) return false; + s_de_key_raw_refs[user_id] = raw_ref; + LOG(DEBUG) << "Installed de key for user " << user_id << std::endl; + } + } + // ext4enc:TODO: go through all DE directories, ensure that all user dirs have the + // correct policy set on them, and that no rogue ones exist. + return true; +} + +bool e4crypt_initialize_global_de() { + LOG(INFO) << "e4crypt_initialize_global_de" << std::endl; + + if (s_global_de_initialized) { + LOG(INFO) << "Already initialized" << std::endl; + return true; + } + + PolicyKeyRef device_ref; + LOG(INFO) << "calling retrieveAndInstallKey\n"; + if (!android::vold::retrieveAndInstallKey(true, kEmptyAuthentication, device_key_path, + device_key_temp, &device_ref.key_raw_ref)) + return false; + get_data_file_encryption_modes(&device_ref); + + std::string modestring = device_ref.contents_mode + ":" + device_ref.filenames_mode; + std::string mode_filename = std::string("/data") + e4crypt_key_mode; + if (!android::base::WriteStringToFile(modestring, mode_filename)) { + PLOG(ERROR) << "Cannot save type" << std::endl; + return false; + } + + std::string ref_filename = std::string("/data") + e4crypt_key_ref; + if (!android::base::WriteStringToFile(device_ref.key_raw_ref, ref_filename)) { + PLOG(ERROR) << "Cannot save key reference to:" << ref_filename << std::endl; + return false; + } + LOG(INFO) << "Wrote system DE key reference to:" << ref_filename << std::endl; + + s_global_de_initialized = true; + de_raw_ref = device_ref.key_raw_ref; + return true; +} + +bool e4crypt_init_user0() { + LOG(DEBUG) << "e4crypt_init_user0\n"; + if (e4crypt_is_native()) { + if (!prepare_dir(user_key_dir, 0700, AID_ROOT, AID_ROOT)) return false; + if (!prepare_dir(user_key_dir + "/ce", 0700, AID_ROOT, AID_ROOT)) return false; + if (!prepare_dir(user_key_dir + "/de", 0700, AID_ROOT, AID_ROOT)) return false; + if (!android::vold::pathExists(get_de_key_path(0))) { + if (!create_and_install_user_keys(0, false)) return false; + } + // TODO: switch to loading only DE_0 here once framework makes + // explicit calls to install DE keys for secondary users + if (!load_all_de_keys()) return false; + } + // We can only safely prepare DE storage here, since CE keys are probably + // entangled with user credentials. The framework will always prepare CE + // storage once CE keys are installed. + if (!e4crypt_prepare_user_storage("", 0, 0, /*android::os::IVold::*/STORAGE_FLAG_DE)) { + LOG(ERROR) << "Failed to prepare user 0 storage" << std::endl; + return false; + } + + // If this is a non-FBE device that recently left an emulated mode, + // restore user data directories to known-good state. + if (!e4crypt_is_native() && !e4crypt_is_emulated()) { + e4crypt_unlock_user_key(0, 0, "!", "!"); + } + + return true; +} + +/*bool e4crypt_vold_create_user_key(userid_t user_id, int serial, bool ephemeral) { + LOG(DEBUG) << "TWRP NOT e4crypt_vold_create_user_key for " << user_id << " serial " << serial; + return true; + if (!e4crypt_is_native()) { + return true; + } + // FIXME test for existence of key that is not loaded yet + if (s_ce_key_raw_refs.count(user_id) != 0) { + LOG(ERROR) << "Already exists, can't e4crypt_vold_create_user_key for " << user_id + << " serial " << serial; + // FIXME should we fail the command? + return true; + } + if (!create_and_install_user_keys(user_id, ephemeral)) { + return false; + } + return true; +} + +static void drop_caches() { + // Clean any dirty pages (otherwise they won't be dropped). + sync(); + // Drop inode and page caches. + if (!WriteStringToFile("3", "/proc/sys/vm/drop_caches")) { + PLOG(ERROR) << "Failed to drop caches during key eviction"; + } +} + +static bool evict_ce_key(userid_t user_id) { + LOG(ERROR) << "TWRP NOT evict_ce_key\n"; + return true; + s_ce_keys.erase(user_id); + bool success = true; + std::string raw_ref; + // If we haven't loaded the CE key, no need to evict it. + if (lookup_key_ref(s_ce_key_raw_refs, user_id, &raw_ref)) { + success &= android::vold::evictKey(raw_ref); + drop_caches(); + } + s_ce_key_raw_refs.erase(user_id); + return success; +} + +bool e4crypt_destroy_user_key(userid_t user_id) { + LOG(DEBUG) << "NOT e4crypt_destroy_user_key(" << user_id << ")"; + return true; + if (!e4crypt_is_native()) { + return true; + } + bool success = true; + std::string raw_ref; + success &= evict_ce_key(user_id); + success &= lookup_key_ref(s_de_key_raw_refs, user_id, &raw_ref) + && android::vold::evictKey(raw_ref); + s_de_key_raw_refs.erase(user_id); + auto it = s_ephemeral_users.find(user_id); + if (it != s_ephemeral_users.end()) { + s_ephemeral_users.erase(it); + } else { + for (auto const path: get_ce_key_paths(get_ce_key_directory_path(user_id))) { + success &= android::vold::destroyKey(path); + } + auto de_key_path = get_de_key_path(user_id); + if (android::vold::pathExists(de_key_path)) { + success &= android::vold::destroyKey(de_key_path); + } else { + LOG(INFO) << "Not present so not erasing: " << de_key_path; + } + } + return success; +} + +static bool emulated_lock(const std::string& path) { + if (chmod(path.c_str(), 0000) != 0) { + PLOG(ERROR) << "Failed to chmod " << path; + return false; + } +#if EMULATED_USES_SELINUX + if (setfilecon(path.c_str(), "u:object_r:storage_stub_file:s0") != 0) { + PLOG(WARNING) << "Failed to setfilecon " << path; + return false; + } +#endif + return true; +}*/ + +static bool emulated_unlock(const std::string& path, mode_t mode) { + if (chmod(path.c_str(), mode) != 0) { + PLOG(ERROR) << "Failed to chmod " << path << std::endl; + // FIXME temporary workaround for b/26713622 + if (e4crypt_is_emulated()) return false; + } +#if EMULATED_USES_SELINUX + if (selinux_android_restorecon(path.c_str(), SELINUX_ANDROID_RESTORECON_FORCE) != 0) { + PLOG(WARNING) << "Failed to restorecon " << path << std::endl; + // FIXME temporary workaround for b/26713622 + if (e4crypt_is_emulated()) return false; + } +#endif + return true; +} + +static bool parse_hex(const std::string& hex, std::string* result) { + if (hex == "!") { + *result = ""; + return true; + } + if (android::vold::HexToStr(hex, *result) != 0) { + LOG(ERROR) << "Invalid FBE hex string" << std::endl; // Don't log the string for security reasons + return false; + } + return true; +} + +static std::string volkey_path(const std::string& misc_path, const std::string& volume_uuid) { + return misc_path + "/vold/volume_keys/" + volume_uuid + "/default"; +} + +static std::string volume_secdiscardable_path(const std::string& volume_uuid) { + return systemwide_volume_key_dir + "/" + volume_uuid + "/secdiscardable"; +} + +static bool read_or_create_volkey(const std::string& misc_path, const std::string& volume_uuid, + PolicyKeyRef* key_ref) { + auto secdiscardable_path = volume_secdiscardable_path(volume_uuid); + std::string secdiscardable_hash; + if (android::vold::pathExists(secdiscardable_path)) { + if (!android::vold::readSecdiscardable(secdiscardable_path, &secdiscardable_hash)) + return false; + } else { + if (fs_mkdirs(secdiscardable_path.c_str(), 0700) != 0) { + PLOG(ERROR) << "Creating directories for: " << secdiscardable_path << std::endl; + return false; + } + if (!android::vold::createSecdiscardable(secdiscardable_path, &secdiscardable_hash)) + return false; + } + auto key_path = volkey_path(misc_path, volume_uuid); + if (fs_mkdirs(key_path.c_str(), 0700) != 0) { + PLOG(ERROR) << "Creating directories for: " << key_path << std::endl; + return false; + } + android::vold::KeyAuthentication auth("", secdiscardable_hash); + if (!android::vold::retrieveAndInstallKey(true, auth, key_path, key_path + "_tmp", + &key_ref->key_raw_ref)) + return false; + key_ref->contents_mode = + android::base::GetProperty("ro.crypto.volume.contents_mode", "aes-256-xts"); + key_ref->filenames_mode = + android::base::GetProperty("ro.crypto.volume.filenames_mode", "aes-256-heh"); + return true; +} + +/*static bool destroy_volkey(const std::string& misc_path, const std::string& volume_uuid) { + auto path = volkey_path(misc_path, volume_uuid); + if (!android::vold::pathExists(path)) return true; + return android::vold::destroyKey(path); +} + +bool e4crypt_add_user_key_auth(userid_t user_id, int serial, const std::string& token_hex, + const std::string& secret_hex) { + LOG(DEBUG) << "e4crypt_add_user_key_auth " << user_id << " serial=" << serial + << " token_present=" << (token_hex != "!"); + if (!e4crypt_is_native()) return true; + if (s_ephemeral_users.count(user_id) != 0) return true; + std::string token, secret; + if (!parse_hex(token_hex, &token)) return false; + if (!parse_hex(secret_hex, &secret)) return false; + auto auth = secret.empty() ? kEmptyAuthentication + : android::vold::KeyAuthentication(token, secret); + auto it = s_ce_keys.find(user_id); + if (it == s_ce_keys.end()) { + LOG(ERROR) << "Key not loaded into memory, can't change for user " << user_id; + return false; + } + const auto &ce_key = it->second; + auto const directory_path = get_ce_key_directory_path(user_id); + auto const paths = get_ce_key_paths(directory_path); + std::string ce_key_path; + if (!get_ce_key_new_path(directory_path, paths, &ce_key_path)) return false; + if (!android::vold::storeKeyAtomically(ce_key_path, user_key_temp, auth, ce_key)) return false; + return true; +} + +bool e4crypt_fixate_newest_user_key_auth(userid_t user_id) { + LOG(DEBUG) << "e4crypt_fixate_newest_user_key_auth " << user_id; + if (!e4crypt_is_native()) return true; + if (s_ephemeral_users.count(user_id) != 0) return true; + auto const directory_path = get_ce_key_directory_path(user_id); + auto const paths = get_ce_key_paths(directory_path); + if (paths.empty()) { + LOG(ERROR) << "No ce keys present, cannot fixate for user " << user_id; + return false; + } + fixate_user_ce_key(directory_path, paths[0], paths); + return true; +}*/ + +// TODO: rename to 'install' for consistency, and take flags to know which keys to install +bool e4crypt_unlock_user_key(userid_t user_id, int serial, const std::string& token_hex, + const std::string& secret_hex) { + LOG(DEBUG) << "e4crypt_unlock_user_key " << user_id << " serial=" << serial + << " token_present=" << (token_hex != "!") << std::endl; + if (e4crypt_is_native()) { + if (s_ce_key_raw_refs.count(user_id) != 0) { + LOG(WARNING) << "Tried to unlock already-unlocked key for user " << user_id << std::endl; + return true; + } + std::string token, secret; + if (!parse_hex(token_hex, &token)) return false; + if (!parse_hex(secret_hex, &secret)) return false; + android::vold::KeyAuthentication auth(token, secret); + if (!read_and_install_user_ce_key(user_id, auth)) { + LOG(ERROR) << "Couldn't read key for " << user_id << std::endl; + return false; + } + } else { + // When in emulation mode, we just use chmod. However, we also + // unlock directories when not in emulation mode, to bring devices + // back into a known-good state. + if (!emulated_unlock(android::vold::BuildDataSystemCePath(user_id), 0771) || + !emulated_unlock(android::vold::BuildDataMiscCePath(user_id), 01771) || + !emulated_unlock(android::vold::BuildDataMediaCePath("", user_id), 0770) || + !emulated_unlock(android::vold::BuildDataUserCePath("", user_id), 0771)) { + LOG(ERROR) << "Failed to unlock user " << user_id << std::endl; + return false; + } + } + return true; +} + +// TODO: rename to 'evict' for consistency +/*bool e4crypt_lock_user_key(userid_t user_id) { + LOG(DEBUG) << "TWRP NOTe4crypt_lock_user_key " << user_id; + return true; + if (e4crypt_is_native()) { + return evict_ce_key(user_id); + } else if (e4crypt_is_emulated()) { + // When in emulation mode, we just use chmod + if (!emulated_lock(android::vold::BuildDataSystemCePath(user_id)) || + !emulated_lock(android::vold::BuildDataMiscCePath(user_id)) || + !emulated_lock(android::vold::BuildDataMediaCePath("", user_id)) || + !emulated_lock(android::vold::BuildDataUserCePath("", user_id))) { + LOG(ERROR) << "Failed to lock user " << user_id; + return false; + } + } + + return true; +}*/ + +static bool prepare_subdirs(const std::string& action, const std::string& volume_uuid, + userid_t user_id, int flags) { + LOG(ERROR) << "not actually forking for vold_prepare_subdirs\n"; + return true; + /*if (0 != android::vold::ForkExecvp( + std::vector<std::string>{prepare_subdirs_path, action, volume_uuid, + std::to_string(user_id), std::to_string(flags)})) { + LOG(ERROR) << "vold_prepare_subdirs failed"; + return false; + } + return true;*/ +} + +bool e4crypt_prepare_user_storage(const std::string& volume_uuid, userid_t user_id, int serial, + int flags) { + LOG(DEBUG) << "e4crypt_prepare_user_storage for volume " << escape_empty(volume_uuid) + << ", user " << user_id << ", serial " << serial << ", flags " << flags << std::endl; + + if (flags & /*android::os::IVold::*/STORAGE_FLAG_DE) { + // DE_sys key + auto system_legacy_path = android::vold::BuildDataSystemLegacyPath(user_id); + auto misc_legacy_path = android::vold::BuildDataMiscLegacyPath(user_id); + auto profiles_de_path = android::vold::BuildDataProfilesDePath(user_id); + + // DE_n key + auto system_de_path = android::vold::BuildDataSystemDePath(user_id); + auto misc_de_path = android::vold::BuildDataMiscDePath(user_id); + auto vendor_de_path = android::vold::BuildDataVendorDePath(user_id); + auto user_de_path = android::vold::BuildDataUserDePath(nullptr, user_id); + + if (volume_uuid.empty()) { + if (!prepare_dir(system_legacy_path, 0700, AID_SYSTEM, AID_SYSTEM)) return false; +#if MANAGE_MISC_DIRS + if (!prepare_dir(misc_legacy_path, 0750, multiuser_get_uid(user_id, AID_SYSTEM), + multiuser_get_uid(user_id, AID_EVERYBODY))) return false; +#endif + if (!prepare_dir(profiles_de_path, 0771, AID_SYSTEM, AID_SYSTEM)) return false; + if (!prepare_dir(system_de_path, 0770, AID_SYSTEM, AID_SYSTEM)) return false; + if (!prepare_dir(misc_de_path, 01771, AID_SYSTEM, AID_MISC)) return false; + if (!prepare_dir(vendor_de_path, 0771, AID_ROOT, AID_ROOT)) return false; + } + if (!prepare_dir(user_de_path, 0771, AID_SYSTEM, AID_SYSTEM)) return false; + + if (e4crypt_is_native()) { + PolicyKeyRef de_ref; + if (volume_uuid.empty()) { + if (!lookup_key_ref(s_de_key_raw_refs, user_id, &de_ref.key_raw_ref)) return false; + get_data_file_encryption_modes(&de_ref); + if (!ensure_policy(de_ref, system_de_path)) return false; + if (!ensure_policy(de_ref, misc_de_path)) return false; + if (!ensure_policy(de_ref, vendor_de_path)) return false; + } else { + if (!read_or_create_volkey(misc_de_path, nullptr, &de_ref)) return false; + } + if (!ensure_policy(de_ref, user_de_path)) return false; + } + } + + if (flags & /*android::os::IVold::*/STORAGE_FLAG_CE) { + // CE_n key + auto system_ce_path = android::vold::BuildDataSystemCePath(user_id); + auto misc_ce_path = android::vold::BuildDataMiscCePath(user_id); + auto vendor_ce_path = android::vold::BuildDataVendorCePath(user_id); + auto media_ce_path = android::vold::BuildDataMediaCePath(nullptr, user_id); + auto user_ce_path = android::vold::BuildDataUserCePath(nullptr, user_id); + + if (volume_uuid.empty()) { + if (!prepare_dir(system_ce_path, 0770, AID_SYSTEM, AID_SYSTEM)) return false; + if (!prepare_dir(misc_ce_path, 01771, AID_SYSTEM, AID_MISC)) return false; + if (!prepare_dir(vendor_ce_path, 0771, AID_ROOT, AID_ROOT)) return false; + } + if (!prepare_dir(media_ce_path, 0770, AID_MEDIA_RW, AID_MEDIA_RW)) return false; + if (!prepare_dir(user_ce_path, 0771, AID_SYSTEM, AID_SYSTEM)) return false; + + if (e4crypt_is_native()) { + PolicyKeyRef ce_ref; + if (volume_uuid.empty()) { + if (!lookup_key_ref(s_ce_key_raw_refs, user_id, &ce_ref.key_raw_ref)) return false; + get_data_file_encryption_modes(&ce_ref); + if (!ensure_policy(ce_ref, system_ce_path)) return false; + if (!ensure_policy(ce_ref, misc_ce_path)) return false; + if (!ensure_policy(ce_ref, vendor_ce_path)) return false; + } else { + if (!read_or_create_volkey(misc_ce_path, nullptr, &ce_ref)) return false; + } + if (!ensure_policy(ce_ref, media_ce_path)) return false; + if (!ensure_policy(ce_ref, user_ce_path)) return false; + } + + if (volume_uuid.empty()) { + // Now that credentials have been installed, we can run restorecon + // over these paths + // NOTE: these paths need to be kept in sync with libselinux + //android::vold::RestoreconRecursive(system_ce_path); + //android::vold::RestoreconRecursive(misc_ce_path); + } + } + if (!prepare_subdirs("prepare", volume_uuid, user_id, flags)) return false; + return true; +} + +/*bool e4crypt_destroy_user_storage(const std::string& volume_uuid, userid_t user_id, int flags) { + LOG(DEBUG) << "TWRP NOT e4crypt_destroy_user_storage for volume " << escape_empty(volume_uuid) + << ", user " << user_id << ", flags " << flags; + bool res = true; + return res; + + res &= prepare_subdirs("destroy", volume_uuid, user_id, flags); + + if (flags & android::os::IVold::STORAGE_FLAG_CE) { + // CE_n key + auto system_ce_path = android::vold::BuildDataSystemCePath(user_id); + auto misc_ce_path = android::vold::BuildDataMiscCePath(user_id); + auto vendor_ce_path = android::vold::BuildDataVendorCePath(user_id); + auto media_ce_path = android::vold::BuildDataMediaCePath(nullptr, user_id); + auto user_ce_path = android::vold::BuildDataUserCePath(nullptr, user_id); + + res &= destroy_dir(media_ce_path); + res &= destroy_dir(user_ce_path); + if (volume_uuid.empty()) { + res &= destroy_dir(system_ce_path); + res &= destroy_dir(misc_ce_path); + res &= destroy_dir(vendor_ce_path); + } else { + if (e4crypt_is_native()) { + res &= destroy_volkey(misc_ce_path, volume_uuid); + } + } + } + + if (flags & android::os::IVold::STORAGE_FLAG_DE) { + // DE_sys key + auto system_legacy_path = android::vold::BuildDataSystemLegacyPath(user_id); + auto misc_legacy_path = android::vold::BuildDataMiscLegacyPath(user_id); + auto profiles_de_path = android::vold::BuildDataProfilesDePath(user_id); + + // DE_n key + auto system_de_path = android::vold::BuildDataSystemDePath(user_id); + auto misc_de_path = android::vold::BuildDataMiscDePath(user_id); + auto vendor_de_path = android::vold::BuildDataVendorDePath(user_id); + auto user_de_path = android::vold::BuildDataUserDePath(nullptr, user_id); + + res &= destroy_dir(user_de_path); + if (volume_uuid.empty()) { + res &= destroy_dir(system_legacy_path); +#if MANAGE_MISC_DIRS + res &= destroy_dir(misc_legacy_path); +#endif + res &= destroy_dir(profiles_de_path); + res &= destroy_dir(system_de_path); + res &= destroy_dir(misc_de_path); + res &= destroy_dir(vendor_de_path); + } else { + if (e4crypt_is_native()) { + res &= destroy_volkey(misc_de_path, volume_uuid); + } + } + } + + return res; +} + +static bool destroy_volume_keys(const std::string& directory_path, const std::string& volume_uuid) { + LOG(ERROR) << "TWRP NOT destroy_volume_keys\n"; + return true; + auto dirp = std::unique_ptr<DIR, int (*)(DIR*)>(opendir(directory_path.c_str()), closedir); + if (!dirp) { + PLOG(ERROR) << "Unable to open directory: " + directory_path; + return false; + } + bool res = true; + for (;;) { + errno = 0; + auto const entry = readdir(dirp.get()); + if (!entry) { + if (errno) { + PLOG(ERROR) << "Unable to read directory: " + directory_path; + return false; + } + break; + } + if (entry->d_type != DT_DIR || entry->d_name[0] == '.') { + LOG(DEBUG) << "Skipping non-user " << entry->d_name; + continue; + } + res &= destroy_volkey(directory_path + "/" + entry->d_name, volume_uuid); + } + return res; +} + +bool e4crypt_destroy_volume_keys(const std::string& volume_uuid) { + bool res = true; + LOG(DEBUG) << "TWRP NOT e4crypt_destroy_volume_keys for volume " << escape_empty(volume_uuid); + /*return res; + auto secdiscardable_path = volume_secdiscardable_path(volume_uuid); + res &= android::vold::runSecdiscardSingle(secdiscardable_path); + res &= destroy_volume_keys("/data/misc_ce", volume_uuid); + res &= destroy_volume_keys("/data/misc_de", volume_uuid); + return res; +}*/ |