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Merge "Use new C++ libfscrypt interface." am: 7e43d985cf am: e96e670746 am: d1823f16c8

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am: 9572a9fcdc

Change-Id: I2bb5b868ea8bf494eab1e4725a82e7b112ad63b2
This commit is contained in:
Paul Crowley 2019-10-25 11:52:07 -07:00 committed by android-build-merger
commit 3941682cf3
1 changed files with 45 additions and 73 deletions
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118
FsCrypt.cpp
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@ -65,18 +65,10 @@ using android::fs_mgr::GetEntryForMountPoint;
using android::vold::kEmptyAuthentication;
using android::vold::KeyBuffer;
using android::vold::writeStringToFile;
using namespace android::fscrypt;
namespace {
struct PolicyKeyRef {
std::string contents_mode;
std::string filenames_mode;
int policy_version;
std::string key_raw_ref;
PolicyKeyRef() : policy_version(0) {}
};
const std::string device_key_dir = std::string() + DATA_MNT_POINT + fscrypt_unencrypted_folder;
const std::string device_key_path = device_key_dir + "/key";
const std::string device_key_temp = device_key_dir + "/temp";
@ -204,46 +196,28 @@ static bool read_and_fixate_user_ce_key(userid_t user_id,
}
// Retrieve the options to use for encryption policies on the /data filesystem.
static void get_data_file_encryption_options(PolicyKeyRef* key_ref) {
static void get_data_file_encryption_options(EncryptionOptions* options) {
auto entry = GetEntryForMountPoint(&fstab_default, DATA_MNT_POINT);
if (entry == nullptr) {
return;
}
key_ref->contents_mode = entry->file_contents_mode;
key_ref->filenames_mode = entry->file_names_mode;
key_ref->policy_version = entry->file_policy_version;
ParseOptionsParts(entry->file_contents_mode, entry->file_names_mode, entry->file_policy_version,
options);
}
// Retrieve the version to use for encryption policies on the /data filesystem.
static int get_data_file_policy_version(void) {
auto entry = GetEntryForMountPoint(&fstab_default, DATA_MNT_POINT);
if (entry == nullptr) {
return 0;
}
return entry->file_policy_version;
EncryptionOptions options;
get_data_file_encryption_options(&options);
return options.version;
}
// Retrieve the options to use for encryption policies on adoptable storage.
static bool get_volume_file_encryption_options(PolicyKeyRef* key_ref) {
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");
key_ref->policy_version = 1;
std::string raw_flags = android::base::GetProperty("ro.crypto.volume.flags", "");
auto flags = android::base::Split(raw_flags, "+");
for (const auto& flag : flags) {
if (flag == "v1") {
key_ref->policy_version = 1;
} else if (flag == "v2") {
key_ref->policy_version = 2;
} else {
LOG(ERROR) << "Unknown flag in ro.crypto.volume.flags: " << flag;
return false;
}
}
return true;
static bool get_volume_file_encryption_options(EncryptionOptions* options) {
return ParseOptionsParts(
android::base::GetProperty("ro.crypto.volume.contents_mode", "aes-256-xts"),
android::base::GetProperty("ro.crypto.volume.filenames_mode", "aes-256-heh"),
android::base::GetProperty("ro.crypto.volume.flags", "v1"), options);
}
// Install a key for use by encrypted files on the /data filesystem.
@ -333,12 +307,6 @@ static bool lookup_key_ref(const std::map<userid_t, std::string>& key_map, useri
return true;
}
static bool ensure_policy(const PolicyKeyRef& key_ref, const std::string& path) {
return fscrypt_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(), key_ref.policy_version) == 0;
}
static bool is_numeric(const char* name) {
for (const char* p = name; *p != '\0'; p++) {
if (!isdigit(*p)) return false;
@ -391,22 +359,24 @@ bool fscrypt_initialize_systemwide_keys() {
return true;
}
PolicyKeyRef device_ref;
get_data_file_encryption_options(&device_ref);
EncryptionPolicy device_policy;
get_data_file_encryption_options(&device_policy.options);
if (!android::vold::retrieveAndInstallKey(true, kEmptyAuthentication, device_key_path,
device_key_temp, "", device_ref.policy_version,
&device_ref.key_raw_ref))
device_key_temp, "", device_policy.options.version,
&device_policy.key_raw_ref))
return false;
std::string options_string =
StringPrintf("%s:%s:v%d", device_ref.contents_mode.c_str(),
device_ref.filenames_mode.c_str(), device_ref.policy_version);
std::string options_string;
if (!OptionsToString(device_policy.options, &options_string)) {
LOG(ERROR) << "Unable to serialize options";
return false;
}
std::string options_filename = std::string("/data") + fscrypt_key_mode;
if (!android::vold::writeStringToFile(options_string, options_filename)) return false;
std::string ref_filename = std::string("/data") + fscrypt_key_ref;
if (!android::vold::writeStringToFile(device_ref.key_raw_ref, ref_filename)) return false;
if (!android::vold::writeStringToFile(device_policy.key_raw_ref, ref_filename)) return false;
LOG(INFO) << "Wrote system DE key reference to:" << ref_filename;
KeyBuffer per_boot_key;
@ -582,7 +552,7 @@ static std::string volume_secdiscardable_path(const std::string& volume_uuid) {
}
static bool read_or_create_volkey(const std::string& misc_path, const std::string& volume_uuid,
PolicyKeyRef* key_ref) {
EncryptionPolicy* policy) {
auto secdiscardable_path = volume_secdiscardable_path(volume_uuid);
std::string secdiscardable_hash;
if (android::vold::pathExists(secdiscardable_path)) {
@ -603,11 +573,11 @@ static bool read_or_create_volkey(const std::string& misc_path, const std::strin
}
android::vold::KeyAuthentication auth("", secdiscardable_hash);
if (!get_volume_file_encryption_options(key_ref)) return false;
if (!get_volume_file_encryption_options(&policy->options)) return false;
return android::vold::retrieveAndInstallKey(true, auth, key_path, key_path + "_tmp",
volume_uuid, key_ref->policy_version,
&key_ref->key_raw_ref);
volume_uuid, policy->options.version,
&policy->key_raw_ref);
}
static bool destroy_volkey(const std::string& misc_path, const std::string& volume_uuid) {
@ -752,17 +722,18 @@ bool fscrypt_prepare_user_storage(const std::string& volume_uuid, userid_t user_
if (!prepare_dir(user_de_path, 0771, AID_SYSTEM, AID_SYSTEM)) return false;
if (fscrypt_is_native()) {
PolicyKeyRef de_ref;
EncryptionPolicy de_policy;
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_options(&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;
if (!lookup_key_ref(s_de_key_raw_refs, user_id, &de_policy.key_raw_ref))
return false;
get_data_file_encryption_options(&de_policy.options);
if (!EnsurePolicy(de_policy, system_de_path)) return false;
if (!EnsurePolicy(de_policy, misc_de_path)) return false;
if (!EnsurePolicy(de_policy, vendor_de_path)) return false;
} else {
if (!read_or_create_volkey(misc_de_path, volume_uuid, &de_ref)) return false;
if (!read_or_create_volkey(misc_de_path, volume_uuid, &de_policy)) return false;
}
if (!ensure_policy(de_ref, user_de_path)) return false;
if (!EnsurePolicy(de_policy, user_de_path)) return false;
}
}
@ -783,19 +754,20 @@ bool fscrypt_prepare_user_storage(const std::string& volume_uuid, userid_t user_
if (!prepare_dir(user_ce_path, 0771, AID_SYSTEM, AID_SYSTEM)) return false;
if (fscrypt_is_native()) {
PolicyKeyRef ce_ref;
EncryptionPolicy ce_policy;
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_options(&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;
if (!lookup_key_ref(s_ce_key_raw_refs, user_id, &ce_policy.key_raw_ref))
return false;
get_data_file_encryption_options(&ce_policy.options);
if (!EnsurePolicy(ce_policy, system_ce_path)) return false;
if (!EnsurePolicy(ce_policy, misc_ce_path)) return false;
if (!EnsurePolicy(ce_policy, vendor_ce_path)) return false;
} else {
if (!read_or_create_volkey(misc_ce_path, volume_uuid, &ce_ref)) return false;
if (!read_or_create_volkey(misc_ce_path, volume_uuid, &ce_policy)) return false;
}
if (!ensure_policy(ce_ref, media_ce_path)) return false;
if (!ensure_policy(ce_ref, user_ce_path)) return false;
if (!EnsurePolicy(ce_policy, media_ce_path)) return false;
if (!EnsurePolicy(ce_policy, user_ce_path)) return false;
}
if (volume_uuid.empty()) {