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@ -63,6 +63,7 @@
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using android::base::StringPrintf;
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using android::fs_mgr::GetEntryForMountPoint;
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using android::vold::BuildDataPath;
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using android::vold::kEmptyAuthentication;
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using android::vold::KeyBuffer;
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using android::vold::writeStringToFile;
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@ -86,9 +87,9 @@ bool s_systemwide_keys_initialized = false;
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// Some users are ephemeral, don't try to wipe their keys from disk
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std::set<userid_t> s_ephemeral_users;
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// Map user ids to key references
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std::map<userid_t, std::string> s_de_key_raw_refs;
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std::map<userid_t, std::string> s_ce_key_raw_refs;
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// Map user ids to encryption policies
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std::map<userid_t, EncryptionPolicy> s_de_policies;
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std::map<userid_t, EncryptionPolicy> s_ce_policies;
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} // namespace
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@ -195,23 +196,18 @@ static bool read_and_fixate_user_ce_key(userid_t user_id,
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}
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// Retrieve the options to use for encryption policies on the /data filesystem.
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static void get_data_file_encryption_options(EncryptionOptions* options) {
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static bool get_data_file_encryption_options(EncryptionOptions* options) {
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auto entry = GetEntryForMountPoint(&fstab_default, DATA_MNT_POINT);
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if (entry == nullptr) {
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return;
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LOG(ERROR) << "No mount point entry for " << DATA_MNT_POINT;
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return false;
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}
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if (!ParseOptions(entry->encryption_options, options)) {
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LOG(ERROR) << "Unable to parse encryption options for " << DATA_MNT_POINT ": "
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<< entry->encryption_options;
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return;
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return false;
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}
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}
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// Retrieve the version to use for encryption policies on the /data filesystem.
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static int get_data_file_policy_version(void) {
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EncryptionOptions options;
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get_data_file_encryption_options(&options);
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return options.version;
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return true;
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}
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// Retrieve the options to use for encryption policies on adoptable storage.
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@ -220,29 +216,25 @@ static bool get_volume_file_encryption_options(EncryptionOptions* options) {
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android::base::GetProperty("ro.crypto.volume.contents_mode", "aes-256-xts");
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auto filenames_mode =
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android::base::GetProperty("ro.crypto.volume.filenames_mode", "aes-256-heh");
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return ParseOptions(android::base::GetProperty("ro.crypto.volume.options",
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contents_mode + ":" + filenames_mode + ":v1"),
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options);
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}
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// Install a key for use by encrypted files on the /data filesystem.
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static bool install_data_key(const KeyBuffer& key, std::string* raw_ref) {
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return android::vold::installKey(key, DATA_MNT_POINT, get_data_file_policy_version(), raw_ref);
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}
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// Evict a key for use by encrypted files on the /data filesystem.
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static bool evict_data_key(const std::string& raw_ref) {
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return android::vold::evictKey(DATA_MNT_POINT, raw_ref, get_data_file_policy_version());
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auto options_string = android::base::GetProperty("ro.crypto.volume.options",
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contents_mode + ":" + filenames_mode + ":v1");
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if (!ParseOptions(options_string, options)) {
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LOG(ERROR) << "Unable to parse volume encryption options: " << options_string;
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return false;
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}
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return true;
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}
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static bool read_and_install_user_ce_key(userid_t user_id,
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const android::vold::KeyAuthentication& auth) {
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if (s_ce_key_raw_refs.count(user_id) != 0) return true;
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if (s_ce_policies.count(user_id) != 0) return true;
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EncryptionOptions options;
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if (!get_data_file_encryption_options(&options)) return false;
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KeyBuffer ce_key;
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if (!read_and_fixate_user_ce_key(user_id, auth, &ce_key)) return false;
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std::string ce_raw_ref;
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if (!install_data_key(ce_key, &ce_raw_ref)) return false;
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s_ce_key_raw_refs[user_id] = ce_raw_ref;
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EncryptionPolicy ce_policy;
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if (!installKey(DATA_MNT_POINT, options, ce_key, &ce_policy)) return false;
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s_ce_policies[user_id] = ce_policy;
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LOG(DEBUG) << "Installed ce key for user " << user_id;
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return true;
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}
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@ -268,6 +260,8 @@ static bool destroy_dir(const std::string& dir) {
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// NB this assumes that there is only one thread listening for crypt commands, because
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// it creates keys in a fixed location.
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static bool create_and_install_user_keys(userid_t user_id, bool create_ephemeral) {
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EncryptionOptions options;
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if (!get_data_file_encryption_options(&options)) return false;
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KeyBuffer de_key, ce_key;
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if (!android::vold::randomKey(&de_key)) return false;
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if (!android::vold::randomKey(&ce_key)) return false;
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@ -289,24 +283,24 @@ static bool create_and_install_user_keys(userid_t user_id, bool create_ephemeral
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kEmptyAuthentication, de_key))
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return false;
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}
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std::string de_raw_ref;
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if (!install_data_key(de_key, &de_raw_ref)) return false;
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s_de_key_raw_refs[user_id] = de_raw_ref;
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std::string ce_raw_ref;
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if (!install_data_key(ce_key, &ce_raw_ref)) return false;
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s_ce_key_raw_refs[user_id] = ce_raw_ref;
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EncryptionPolicy de_policy;
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if (!installKey(DATA_MNT_POINT, options, de_key, &de_policy)) return false;
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s_de_policies[user_id] = de_policy;
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EncryptionPolicy ce_policy;
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if (!installKey(DATA_MNT_POINT, options, ce_key, &ce_policy)) return false;
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s_ce_policies[user_id] = ce_policy;
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LOG(DEBUG) << "Created keys for user " << user_id;
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return true;
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}
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static bool lookup_key_ref(const std::map<userid_t, std::string>& key_map, userid_t user_id,
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std::string* raw_ref) {
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static bool lookup_policy(const std::map<userid_t, EncryptionPolicy>& key_map, userid_t user_id,
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EncryptionPolicy* policy) {
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auto refi = key_map.find(user_id);
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if (refi == key_map.end()) {
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LOG(DEBUG) << "Cannot find key for " << user_id;
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return false;
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}
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*raw_ref = refi->second;
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*policy = refi->second;
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return true;
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}
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@ -318,6 +312,8 @@ static bool is_numeric(const char* name) {
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}
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static bool load_all_de_keys() {
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EncryptionOptions options;
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if (!get_data_file_encryption_options(&options)) return false;
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auto de_dir = user_key_dir + "/de";
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auto dirp = std::unique_ptr<DIR, int (*)(DIR*)>(opendir(de_dir.c_str()), closedir);
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if (!dirp) {
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@ -339,13 +335,13 @@ static bool load_all_de_keys() {
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continue;
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}
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userid_t user_id = std::stoi(entry->d_name);
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if (s_de_key_raw_refs.count(user_id) == 0) {
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if (s_de_policies.count(user_id) == 0) {
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auto key_path = de_dir + "/" + entry->d_name;
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KeyBuffer key;
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if (!android::vold::retrieveKey(key_path, kEmptyAuthentication, &key)) return false;
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std::string raw_ref;
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if (!install_data_key(key, &raw_ref)) return false;
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s_de_key_raw_refs[user_id] = raw_ref;
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KeyBuffer de_key;
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if (!android::vold::retrieveKey(key_path, kEmptyAuthentication, &de_key)) return false;
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EncryptionPolicy de_policy;
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if (!installKey(DATA_MNT_POINT, options, de_key, &de_policy)) return false;
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s_de_policies[user_id] = de_policy;
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LOG(DEBUG) << "Installed de key for user " << user_id;
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}
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}
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@ -361,13 +357,16 @@ bool fscrypt_initialize_systemwide_keys() {
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LOG(INFO) << "Already initialized";
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return true;
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}
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EncryptionOptions options;
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if (!get_data_file_encryption_options(&options)) return false;
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EncryptionPolicy device_policy;
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get_data_file_encryption_options(&device_policy.options);
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KeyBuffer device_key;
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if (!android::vold::retrieveKey(true, kEmptyAuthentication, device_key_path, device_key_temp,
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&device_key))
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return false;
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if (!android::vold::retrieveAndInstallKey(true, kEmptyAuthentication, device_key_path,
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device_key_temp, "", device_policy.options.version,
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&device_policy.key_raw_ref))
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EncryptionPolicy device_policy;
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if (!android::vold::installKey(DATA_MNT_POINT, options, device_key, &device_policy))
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return false;
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std::string options_string;
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@ -375,19 +374,21 @@ bool fscrypt_initialize_systemwide_keys() {
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LOG(ERROR) << "Unable to serialize options";
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return false;
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}
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std::string options_filename = std::string("/data") + fscrypt_key_mode;
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std::string options_filename = std::string(DATA_MNT_POINT) + fscrypt_key_mode;
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if (!android::vold::writeStringToFile(options_string, options_filename)) return false;
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std::string ref_filename = std::string("/data") + fscrypt_key_ref;
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std::string ref_filename = std::string(DATA_MNT_POINT) + fscrypt_key_ref;
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if (!android::vold::writeStringToFile(device_policy.key_raw_ref, ref_filename)) return false;
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LOG(INFO) << "Wrote system DE key reference to:" << ref_filename;
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KeyBuffer per_boot_key;
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if (!android::vold::randomKey(&per_boot_key)) return false;
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std::string per_boot_raw_ref;
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if (!install_data_key(per_boot_key, &per_boot_raw_ref)) return false;
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EncryptionPolicy per_boot_policy;
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if (!android::vold::installKey(DATA_MNT_POINT, options, per_boot_key, &per_boot_policy))
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return false;
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std::string per_boot_ref_filename = std::string("/data") + fscrypt_key_per_boot_ref;
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if (!android::vold::writeStringToFile(per_boot_raw_ref, per_boot_ref_filename)) return false;
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if (!android::vold::writeStringToFile(per_boot_policy.key_raw_ref, per_boot_ref_filename))
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return false;
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LOG(INFO) << "Wrote per boot key reference to:" << per_boot_ref_filename;
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if (!android::vold::FsyncDirectory(device_key_dir)) return false;
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@ -431,7 +432,7 @@ bool fscrypt_vold_create_user_key(userid_t user_id, int serial, bool ephemeral)
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return true;
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}
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// FIXME test for existence of key that is not loaded yet
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if (s_ce_key_raw_refs.count(user_id) != 0) {
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if (s_ce_policies.count(user_id) != 0) {
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LOG(ERROR) << "Already exists, can't fscrypt_vold_create_user_key for " << user_id
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<< " serial " << serial;
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// FIXME should we fail the command?
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@ -466,13 +467,13 @@ static void drop_caches_if_needed() {
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static bool evict_ce_key(userid_t user_id) {
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bool success = true;
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std::string raw_ref;
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EncryptionPolicy policy;
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// If we haven't loaded the CE key, no need to evict it.
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if (lookup_key_ref(s_ce_key_raw_refs, user_id, &raw_ref)) {
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success &= evict_data_key(raw_ref);
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if (lookup_policy(s_ce_policies, user_id, &policy)) {
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success &= android::vold::evictKey(DATA_MNT_POINT, policy);
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drop_caches_if_needed();
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}
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s_ce_key_raw_refs.erase(user_id);
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s_ce_policies.erase(user_id);
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return success;
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}
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@ -482,10 +483,11 @@ bool fscrypt_destroy_user_key(userid_t user_id) {
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return true;
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}
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bool success = true;
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std::string raw_ref;
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success &= evict_ce_key(user_id);
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success &= lookup_key_ref(s_de_key_raw_refs, user_id, &raw_ref) && evict_data_key(raw_ref);
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s_de_key_raw_refs.erase(user_id);
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EncryptionPolicy de_policy;
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success &= lookup_policy(s_de_policies, user_id, &de_policy) &&
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android::vold::evictKey(DATA_MNT_POINT, de_policy);
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s_de_policies.erase(user_id);
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auto it = s_ephemeral_users.find(user_id);
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if (it != s_ephemeral_users.end()) {
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s_ephemeral_users.erase(it);
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@ -587,11 +589,12 @@ static bool read_or_create_volkey(const std::string& misc_path, const std::strin
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}
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android::vold::KeyAuthentication auth("", secdiscardable_hash);
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if (!get_volume_file_encryption_options(&policy->options)) return false;
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return android::vold::retrieveAndInstallKey(true, auth, key_path, key_path + "_tmp",
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volume_uuid, policy->options.version,
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&policy->key_raw_ref);
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EncryptionOptions options;
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if (!get_volume_file_encryption_options(&options)) return false;
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KeyBuffer key;
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if (!android::vold::retrieveKey(true, auth, key_path, key_path + "_tmp", &key)) return false;
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if (!android::vold::installKey(BuildDataPath(volume_uuid), options, key, policy)) return false;
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return true;
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}
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static bool destroy_volkey(const std::string& misc_path, const std::string& volume_uuid) {
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@ -667,7 +670,7 @@ bool fscrypt_unlock_user_key(userid_t user_id, int serial, const std::string& to
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LOG(DEBUG) << "fscrypt_unlock_user_key " << user_id << " serial=" << serial
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<< " token_present=" << (token_hex != "!");
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if (fscrypt_is_native()) {
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if (s_ce_key_raw_refs.count(user_id) != 0) {
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if (s_ce_policies.count(user_id) != 0) {
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LOG(WARNING) << "Tried to unlock already-unlocked key for user " << user_id;
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return true;
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}
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@ -757,9 +760,7 @@ bool fscrypt_prepare_user_storage(const std::string& volume_uuid, userid_t user_
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if (fscrypt_is_native()) {
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EncryptionPolicy de_policy;
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if (volume_uuid.empty()) {
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if (!lookup_key_ref(s_de_key_raw_refs, user_id, &de_policy.key_raw_ref))
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return false;
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get_data_file_encryption_options(&de_policy.options);
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if (!lookup_policy(s_de_policies, user_id, &de_policy)) return false;
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if (!EnsurePolicy(de_policy, system_de_path)) return false;
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if (!EnsurePolicy(de_policy, misc_de_path)) return false;
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if (!EnsurePolicy(de_policy, vendor_de_path)) return false;
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@ -789,13 +790,10 @@ bool fscrypt_prepare_user_storage(const std::string& volume_uuid, userid_t user_
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|
|
if (fscrypt_is_native()) {
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|
|
|
|
EncryptionPolicy ce_policy;
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|
|
|
|
if (volume_uuid.empty()) {
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|
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|
|
if (!lookup_key_ref(s_ce_key_raw_refs, user_id, &ce_policy.key_raw_ref))
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|
return false;
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|
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|
|
get_data_file_encryption_options(&ce_policy.options);
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|
|
if (!lookup_policy(s_ce_policies, user_id, &ce_policy)) return false;
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|
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if (!EnsurePolicy(ce_policy, system_ce_path)) return false;
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if (!EnsurePolicy(ce_policy, misc_ce_path)) return false;
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if (!EnsurePolicy(ce_policy, vendor_ce_path)) return false;
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} else {
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|
|
if (!read_or_create_volkey(misc_ce_path, volume_uuid, &ce_policy)) return false;
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}
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