| // Copyright (c) 2013 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Contains the implementation of class Mount. |
| |
| #include "cryptohome/storage/mount.h" |
| |
| #include <errno.h> |
| #include <sys/mount.h> |
| #include <sys/stat.h> |
| |
| #include <map> |
| #include <memory> |
| #include <set> |
| #include <utility> |
| |
| #include <base/bind.h> |
| #include <base/callback_helpers.h> |
| #include <base/files/file_path.h> |
| #include <base/logging.h> |
| #include <base/hash/sha1.h> |
| #include <base/strings/string_number_conversions.h> |
| #include <base/strings/string_util.h> |
| #include <base/strings/stringprintf.h> |
| #include <base/threading/platform_thread.h> |
| #include <base/values.h> |
| #include <chaps/isolate.h> |
| #include <chaps/token_manager_client.h> |
| #include <brillo/cryptohome.h> |
| #include <brillo/process/process.h> |
| #include <brillo/scoped_umask.h> |
| #include <brillo/secure_blob.h> |
| #include <chromeos/constants/cryptohome.h> |
| #include <google/protobuf/util/message_differencer.h> |
| |
| #include "cryptohome/chaps_client_factory.h" |
| #include "cryptohome/cryptohome_common.h" |
| #include "cryptohome/cryptohome_metrics.h" |
| #include "cryptohome/cryptolib.h" |
| #include "cryptohome/dircrypto_data_migrator/migration_helper.h" |
| #include "cryptohome/dircrypto_util.h" |
| #include "cryptohome/filesystem_layout.h" |
| #include "cryptohome/pkcs11_init.h" |
| #include "cryptohome/platform.h" |
| #include "cryptohome/storage/homedirs.h" |
| #include "cryptohome/storage/mount_utils.h" |
| #include "cryptohome/tpm.h" |
| #include "cryptohome/vault_keyset.h" |
| #include "cryptohome/vault_keyset.pb.h" |
| |
| using base::FilePath; |
| using base::StringPrintf; |
| using brillo::BlobToString; |
| using brillo::SecureBlob; |
| using brillo::cryptohome::home::GetRootPath; |
| using brillo::cryptohome::home::GetUserPath; |
| using brillo::cryptohome::home::IsSanitizedUserName; |
| using brillo::cryptohome::home::kGuestUserName; |
| using brillo::cryptohome::home::SanitizeUserName; |
| using brillo::cryptohome::home::SanitizeUserNameWithSalt; |
| using chaps::IsolateCredentialManager; |
| using google::protobuf::util::MessageDifferencer; |
| |
| namespace { |
| constexpr bool __attribute__((unused)) MountUserSessionOOP() { |
| return USE_MOUNT_OOP; |
| } |
| |
| } // namespace |
| |
| namespace cryptohome { |
| |
| const char kChapsUserName[] = "chaps"; |
| const char kDefaultSharedAccessGroup[] = "chronos-access"; |
| |
| // Message to use when generating a secret for WebAuthn. |
| const char kWebAuthnSecretHmacMessage[] = "AuthTimeWebAuthnSecret"; |
| |
| void StartUserFileAttrsCleanerService(cryptohome::Platform* platform, |
| const std::string& username) { |
| std::unique_ptr<brillo::Process> file_attrs = |
| platform->CreateProcessInstance(); |
| |
| file_attrs->AddArg("/sbin/initctl"); |
| file_attrs->AddArg("start"); |
| file_attrs->AddArg("--no-wait"); |
| file_attrs->AddArg("file_attrs_cleaner_tool"); |
| file_attrs->AddArg( |
| base::StringPrintf("OBFUSCATED_USERNAME=%s", username.c_str())); |
| |
| if (file_attrs->Run() != 0) |
| PLOG(WARNING) << "Error while running file_attrs_cleaner_tool"; |
| } |
| |
| Mount::Mount(Platform* platform, HomeDirs* homedirs) |
| : default_user_(-1), |
| chaps_user_(-1), |
| default_group_(-1), |
| default_access_group_(-1), |
| system_salt_(), |
| platform_(platform), |
| homedirs_(homedirs), |
| pkcs11_state_(kUninitialized), |
| dircrypto_key_reference_(), |
| legacy_mount_(true), |
| bind_mount_downloads_(true), |
| mount_type_(MountType::NONE), |
| shadow_only_(false), |
| default_chaps_client_factory_(new ChapsClientFactory()), |
| chaps_client_factory_(default_chaps_client_factory_.get()), |
| dircrypto_migration_stopped_condition_(&active_dircrypto_migrator_lock_), |
| mount_guest_session_out_of_process_(true), |
| mount_non_ephemeral_session_out_of_process_(true), |
| mount_guest_session_non_root_namespace_(true) {} |
| |
| Mount::Mount() : Mount(nullptr, nullptr) {} |
| |
| Mount::~Mount() { |
| if (IsMounted()) |
| UnmountCryptohome(); |
| } |
| |
| bool Mount::Init() { |
| bool result = true; |
| |
| // Get the user id and group id of the default user |
| if (!platform_->GetUserId(kDefaultSharedUser, &default_user_, |
| &default_group_)) { |
| result = false; |
| } |
| |
| // Get the user id of the chaps user. |
| gid_t not_used; |
| if (!platform_->GetUserId(kChapsUserName, &chaps_user_, ¬_used)) { |
| result = false; |
| } |
| |
| // Get the group id of the default shared access group. |
| if (!platform_->GetGroupId(kDefaultSharedAccessGroup, |
| &default_access_group_)) { |
| result = false; |
| } |
| |
| // One-time load of the global system salt (used in generating username |
| // hashes) |
| if (!homedirs_->GetSystemSalt(&system_salt_)) { |
| LOG(ERROR) << "Failed to load or create the system salt"; |
| result = false; |
| } |
| |
| mounter_.reset(new MountHelper( |
| default_user_, default_group_, default_access_group_, system_salt_, |
| legacy_mount_, bind_mount_downloads_, platform_)); |
| |
| std::unique_ptr<MountNamespace> chrome_mnt_ns; |
| if (mount_guest_session_non_root_namespace_ || IsolateUserSession()) { |
| chrome_mnt_ns = std::make_unique<MountNamespace>( |
| base::FilePath(kUserSessionMountNamespacePath), platform_); |
| } |
| |
| // When the |user_session_isolation| USE flag is set, the mount namespace for |
| // both Guest and regular sessions will be created by session_manager. |
| if (mount_guest_session_non_root_namespace_ && !IsolateUserSession()) { |
| if (!chrome_mnt_ns->Create()) { |
| std::string message = |
| base::StringPrintf("Failed to create mount namespace at %s", |
| kUserSessionMountNamespacePath); |
| cryptohome::ForkAndCrash(message); |
| result = false; |
| } |
| } |
| |
| if (mount_guest_session_out_of_process_ || |
| mount_non_ephemeral_session_out_of_process_) { |
| out_of_process_mounter_.reset(new OutOfProcessMountHelper( |
| system_salt_, std::move(chrome_mnt_ns), legacy_mount_, |
| bind_mount_downloads_, platform_)); |
| } |
| |
| return result; |
| } |
| |
| MountType Mount::DeriveVaultMountType(const std::string& obfuscated_username, |
| bool shall_migrate) const { |
| FilePath ecryptfs_vault_path = GetEcryptfsUserVaultPath(obfuscated_username); |
| bool ecryptfs_vault_exists = platform_->DirectoryExists(ecryptfs_vault_path); |
| |
| if (ecryptfs_vault_exists) { |
| // Keep legacy ecryptfs of migrate to dir_crypto. |
| return shall_migrate ? MountType::DIR_CRYPTO : MountType::ECRYPTFS; |
| } else { |
| // no ecrypfs vault means we have dir_crypto setup. |
| if (shall_migrate) { |
| LOG(ERROR) << "No eCryptfs vault to migrate."; |
| return MountType::NONE; |
| } |
| return MountType::DIR_CRYPTO; |
| } |
| } |
| |
| MountType Mount::ChooseVaultMountType(bool force_ecryptfs) const { |
| if (force_ecryptfs) { |
| return MountType::ECRYPTFS; |
| } |
| |
| dircrypto::KeyState state = platform_->GetDirCryptoKeyState(ShadowRoot()); |
| switch (state) { |
| case dircrypto::KeyState::NOT_SUPPORTED: |
| return MountType::ECRYPTFS; |
| case dircrypto::KeyState::NO_KEY: |
| return MountType::DIR_CRYPTO; |
| case dircrypto::KeyState::UNKNOWN: |
| case dircrypto::KeyState::ENCRYPTED: |
| LOG(ERROR) << "Unexpected state " << static_cast<int>(state); |
| return MountType::NONE; |
| } |
| } |
| |
| bool Mount::AddEcryptfsAuthToken(const FileSystemKeyset& file_system_keyset, |
| std::string* key_signature, |
| std::string* filename_key_signature) const { |
| // Add the File Encryption key (FEK) from the vault keyset. This is the key |
| // that is used to encrypt the file contents when the file is persisted to the |
| // lower filesystem by eCryptfs. |
| *key_signature = |
| CryptoLib::SecureBlobToHex(file_system_keyset.KeyReference().fek_sig); |
| if (!platform_->AddEcryptfsAuthToken(file_system_keyset.Key().fek, |
| *key_signature, |
| file_system_keyset.Key().fek_salt)) { |
| LOG(ERROR) << "Couldn't add eCryptfs file encryption key to keyring."; |
| return false; |
| } |
| |
| // Add the File Name Encryption Key (FNEK) from the vault keyset. This is the |
| // key that is used to encrypt the file name when the file is persisted to the |
| // lower filesystem by eCryptfs. |
| *filename_key_signature = |
| CryptoLib::SecureBlobToHex(file_system_keyset.KeyReference().fnek_sig); |
| if (!platform_->AddEcryptfsAuthToken(file_system_keyset.Key().fnek, |
| *filename_key_signature, |
| file_system_keyset.Key().fnek_salt)) { |
| LOG(ERROR) << "Couldn't add eCryptfs filename encryption key to keyring."; |
| return false; |
| } |
| |
| return true; |
| } |
| |
| MountError Mount::MountEphemeralCryptohome(const std::string& username) { |
| username_ = username; |
| |
| if (homedirs_->IsOrWillBeOwner(username_)) { |
| return MOUNT_ERROR_EPHEMERAL_MOUNT_BY_OWNER; |
| } |
| |
| // Ephemeral mounts don't require dropping keys since they're not dircrypto |
| // mounts. This callback will be executed in the destructor at the latest so |
| // |this| will always be valid. |
| base::Closure cleanup = |
| base::Bind(&Mount::TearDownEphemeralMount, base::Unretained(this)); |
| |
| // Ephemeral cryptohomes for regular users are mounted in-process. |
| if (!MountEphemeralCryptohomeInternal(username_, mounter_.get(), |
| std::move(cleanup))) { |
| homedirs_->Remove(username_); |
| return MOUNT_ERROR_FATAL; |
| } |
| |
| return MOUNT_ERROR_NONE; |
| } |
| |
| bool Mount::PrepareCryptohome(const std::string& obfuscated_username, |
| bool force_ecryptfs) { |
| MountType mount_type = ChooseVaultMountType(force_ecryptfs); |
| if (mount_type == MountType::ECRYPTFS) { |
| // Create the user's vault. |
| FilePath vault_path = GetEcryptfsUserVaultPath(obfuscated_username); |
| if (!platform_->CreateDirectory(vault_path)) { |
| LOG(ERROR) << "Couldn't create vault path: " << vault_path.value(); |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool Mount::MountCryptohome(const std::string& username, |
| const FileSystemKeyset& file_system_keyset, |
| const Mount::MountArgs& mount_args, |
| bool is_pristine, |
| MountError* mount_error) { |
| username_ = username; |
| std::string obfuscated_username = |
| SanitizeUserNameWithSalt(username_, system_salt_); |
| |
| if (!mount_args.shadow_only) { |
| if (!mounter_->EnsureUserMountPoints(username_)) { |
| LOG(ERROR) << "Error creating mountpoint."; |
| *mount_error = MOUNT_ERROR_CREATE_CRYPTOHOME_FAILED; |
| return false; |
| } |
| } |
| |
| mount_type_ = DeriveVaultMountType(obfuscated_username, |
| mount_args.to_migrate_from_ecryptfs); |
| if (mount_type_ == MountType::NONE) { |
| // TODO(dlunev): there should be a more proper error code set. CREATE_FAILED |
| // is a temporary returned error to keep the behaviour unchanged while |
| // refactoring. |
| *mount_error = MOUNT_ERROR_CREATE_CRYPTOHOME_FAILED; |
| return false; |
| } |
| |
| pkcs11_token_auth_data_ = file_system_keyset.chaps_key(); |
| if (!platform_->ClearUserKeyring()) { |
| LOG(ERROR) << "Failed to clear user keyring"; |
| } |
| |
| // Checks whether migration from ecryptfs to dircrypto is needed, and returns |
| // an error when necessary. |
| if (homedirs_->EcryptfsCryptohomeExists(obfuscated_username) && |
| homedirs_->DircryptoCryptohomeExists(obfuscated_username) && |
| !mount_args.to_migrate_from_ecryptfs) { |
| // If both types of home directory existed, it implies that the migration |
| // attempt was aborted in the middle before doing clean up. |
| LOG(ERROR) << "Mount failed because both eCryptfs and dircrypto home" |
| << " directories were found. Need to resume and finish" |
| << " migration first."; |
| *mount_error = MOUNT_ERROR_PREVIOUS_MIGRATION_INCOMPLETE; |
| return false; |
| } |
| |
| if (mount_type_ == MountType::ECRYPTFS && mount_args.force_dircrypto) { |
| // If dircrypto is forced, it's an error to mount ecryptfs home. |
| LOG(ERROR) << "Mount attempt with force_dircrypto on eCryptfs."; |
| *mount_error = MOUNT_ERROR_OLD_ENCRYPTION; |
| return false; |
| } |
| |
| if (!platform_->SetupProcessKeyring()) { |
| LOG(ERROR) << "Failed to set up a process keyring."; |
| *mount_error = MOUNT_ERROR_SETUP_PROCESS_KEYRING_FAILED; |
| return false; |
| } |
| // When migrating, mount both eCryptfs and dircrypto. |
| const bool should_mount_ecryptfs = |
| mount_type_ == MountType::ECRYPTFS || mount_args.to_migrate_from_ecryptfs; |
| const bool should_mount_dircrypto = mount_type_ == MountType::DIR_CRYPTO; |
| if (!should_mount_ecryptfs && !should_mount_dircrypto) { |
| NOTREACHED() << "Unexpected mount type " << static_cast<int>(mount_type_); |
| *mount_error = MOUNT_ERROR_UNEXPECTED_MOUNT_TYPE; |
| return false; |
| } |
| |
| MountHelperInterface* helper; |
| if (mount_non_ephemeral_session_out_of_process_) { |
| helper = out_of_process_mounter_.get(); |
| } else { |
| helper = mounter_.get(); |
| } |
| // Ensure we don't leave any mounts hanging on intermediate errors. |
| // The closure won't outlive the class so |this| will always be valid. |
| // |out_of_process_mounter_|/|mounter_| will always be valid since this |
| // callback runs in the destructor at the latest. |
| base::ScopedClosureRunner unmount_and_drop_keys_runner(base::BindOnce( |
| &Mount::UnmountAndDropKeys, base::Unretained(this), |
| base::BindOnce(&MountHelperInterface::TearDownNonEphemeralMount, |
| base::Unretained(helper)))); |
| |
| std::string key_signature, fnek_signature; |
| if (should_mount_ecryptfs) { |
| // Add the decrypted key to the keyring so that ecryptfs can use it. |
| if (!AddEcryptfsAuthToken(file_system_keyset, &key_signature, |
| &fnek_signature)) { |
| LOG(ERROR) << "Error adding eCryptfs keys."; |
| *mount_error = MOUNT_ERROR_KEYRING_FAILED; |
| return false; |
| } |
| } |
| if (should_mount_dircrypto) { |
| dircrypto_key_reference_.policy_version = |
| dircrypto::GetDirectoryPolicyVersion( |
| GetUserMountDirectory(obfuscated_username)); |
| if (dircrypto_key_reference_.policy_version < 0) { |
| dircrypto_key_reference_.policy_version = |
| dircrypto::CheckFscryptKeyIoctlSupport() ? FSCRYPT_POLICY_V2 |
| : FSCRYPT_POLICY_V1; |
| } |
| dircrypto_key_reference_.reference = |
| file_system_keyset.KeyReference().fek_sig; |
| if (!platform_->AddDirCryptoKeyToKeyring(file_system_keyset.Key().fek, |
| &dircrypto_key_reference_)) { |
| LOG(ERROR) << "Error adding dircrypto key."; |
| *mount_error = MOUNT_ERROR_KEYRING_FAILED; |
| return false; |
| } |
| } |
| |
| // Mount cryptohome |
| // /home/.shadow: owned by root |
| // /home/.shadow/$hash: owned by root |
| // /home/.shadow/$hash/vault: owned by root |
| // /home/.shadow/$hash/mount: owned by root |
| // /home/.shadow/$hash/mount/root: owned by root |
| // /home/.shadow/$hash/mount/user: owned by chronos |
| // /home/chronos: owned by chronos |
| // /home/chronos/user: owned by chronos |
| // /home/user/$hash: owned by chronos |
| // /home/root/$hash: owned by root |
| |
| mount_point_ = GetUserMountDirectory(obfuscated_username); |
| if (!platform_->CreateDirectory(mount_point_)) { |
| PLOG(ERROR) << "User mount directory creation failed for " |
| << mount_point_.value(); |
| *mount_error = MOUNT_ERROR_DIR_CREATION_FAILED; |
| return false; |
| } |
| if (mount_args.to_migrate_from_ecryptfs) { |
| FilePath temporary_mount_point = |
| GetUserTemporaryMountDirectory(obfuscated_username); |
| if (!platform_->CreateDirectory(temporary_mount_point)) { |
| PLOG(ERROR) << "User temporary mount directory creation failed for " |
| << temporary_mount_point.value(); |
| *mount_error = MOUNT_ERROR_DIR_CREATION_FAILED; |
| return false; |
| } |
| } |
| |
| // Since Service::Mount cleans up stale mounts, we should only reach |
| // this point if someone attempts to re-mount an in-use mount point. |
| if (platform_->IsDirectoryMounted(mount_point_)) { |
| LOG(ERROR) << "Mount point is busy: " << mount_point_.value(); |
| *mount_error = MOUNT_ERROR_FATAL; |
| return false; |
| } |
| |
| if (should_mount_dircrypto) { |
| if (!platform_->SetDirCryptoKey(mount_point_, dircrypto_key_reference_)) { |
| LOG(ERROR) << "Failed to set directory encryption policy for " |
| << mount_point_.value(); |
| *mount_error = MOUNT_ERROR_SET_DIR_CRYPTO_KEY_FAILED; |
| return false; |
| } |
| } |
| |
| MountHelper::Options mount_opts = { |
| mount_type_, mount_args.to_migrate_from_ecryptfs, mount_args.shadow_only}; |
| |
| cryptohome::ReportTimerStart(cryptohome::kPerformMountTimer); |
| if (!helper->PerformMount(mount_opts, username_, key_signature, |
| fnek_signature, is_pristine, mount_error)) { |
| LOG(ERROR) << "MountHelper::PerformMount failed, error = " << *mount_error; |
| return false; |
| } |
| |
| cryptohome::ReportTimerStop(cryptohome::kPerformMountTimer); |
| |
| // TODO(chromium:1147601): Move this into user_session.cc and add unittests |
| // when service.cc is gone. |
| PrepareWebAuthnSecret(obfuscated_username, file_system_keyset.Key().fek, |
| file_system_keyset.Key().fnek); |
| |
| // At this point we're done mounting so move the clean-up closure to the |
| // instance variable. |
| mount_cleanup_ = unmount_and_drop_keys_runner.Release(); |
| |
| *mount_error = MOUNT_ERROR_NONE; |
| |
| switch (mount_type_) { |
| case MountType::ECRYPTFS: |
| ReportHomedirEncryptionType(HomedirEncryptionType::kEcryptfs); |
| break; |
| case MountType::DIR_CRYPTO: |
| ReportHomedirEncryptionType(HomedirEncryptionType::kDircrypto); |
| break; |
| default: |
| // We're only interested in encrypted home directories. |
| NOTREACHED() << "Unknown homedir encryption type: " |
| << static_cast<int>(mount_type_); |
| break; |
| } |
| |
| // Start file attribute cleaner service. |
| StartUserFileAttrsCleanerService(platform_, obfuscated_username); |
| |
| // TODO(fqj,b/116072767) Ignore errors since unlabeled files are currently |
| // still okay during current development progress. |
| platform_->RestoreSELinuxContexts(GetUserMountDirectory(obfuscated_username), |
| true); |
| |
| return true; |
| } |
| |
| bool Mount::MountEphemeralCryptohomeInternal( |
| const std::string& username, |
| MountHelperInterface* ephemeral_mounter, |
| base::Closure cleanup) { |
| // Ephemeral cryptohome can't be mounted twice. |
| CHECK(ephemeral_mounter->CanPerformEphemeralMount()); |
| |
| base::ScopedClosureRunner cleanup_runner(cleanup); |
| |
| if (!ephemeral_mounter->PerformEphemeralMount(username)) { |
| LOG(ERROR) << "PerformEphemeralMount() failed, aborting ephemeral mount"; |
| return false; |
| } |
| |
| // Mount succeeded, move the clean-up closure to the instance variable. |
| mount_cleanup_ = cleanup_runner.Release(); |
| |
| mount_type_ = MountType::EPHEMERAL; |
| return true; |
| } |
| |
| void Mount::PrepareWebAuthnSecret(const std::string& obfuscated_username, |
| const brillo::SecureBlob& fek, |
| const brillo::SecureBlob& fnek) { |
| // This WebAuthn secret can be rederived upon in-session user auth success |
| // since they will unlock the vault keyset. |
| const std::string message(kWebAuthnSecretHmacMessage); |
| webauthn_secret_ = std::make_unique<brillo::SecureBlob>( |
| CryptoLib::HmacSha256(brillo::SecureBlob::Combine(fnek, fek), |
| brillo::Blob(message.cbegin(), message.cend()))); |
| clear_webauthn_secret_timer_.Start( |
| FROM_HERE, base::TimeDelta::FromSeconds(5), |
| base::BindOnce(&Mount::ClearWebAuthnSecret, base::Unretained(this))); |
| } |
| |
| void Mount::ClearWebAuthnSecret() { |
| webauthn_secret_.reset(); |
| } |
| |
| std::unique_ptr<brillo::SecureBlob> Mount::GetWebAuthnSecret() { |
| return std::move(webauthn_secret_); |
| } |
| |
| void Mount::TearDownEphemeralMount() { |
| if (!mounter_->TearDownEphemeralMount()) { |
| ReportCryptohomeError(kEphemeralCleanUpFailed); |
| } |
| } |
| |
| void Mount::UnmountAndDropKeys(base::OnceClosure unmounter) { |
| std::move(unmounter).Run(); |
| |
| // Invalidate dircrypto key to make directory contents inaccessible. |
| if (!dircrypto_key_reference_.reference.empty()) { |
| bool result = platform_->InvalidateDirCryptoKey(dircrypto_key_reference_, |
| ShadowRoot()); |
| if (!result) { |
| // TODO(crbug.com/1116109): We should think about what to do after this |
| // operation failed. |
| LOG(ERROR) << "Failed to invalidate dircrypto key"; |
| } |
| ReportInvalidateDirCryptoKeyResult(result); |
| dircrypto_key_reference_.policy_version = FSCRYPT_POLICY_V1; |
| dircrypto_key_reference_.reference.clear(); |
| } |
| } |
| |
| bool Mount::UnmountCryptohome() { |
| // There should be no file access when unmounting. |
| // Stop dircrypto migration if in progress. |
| MaybeCancelActiveDircryptoMigrationAndWait(); |
| |
| if (!mount_cleanup_.is_null()) { |
| std::move(mount_cleanup_).Run(); |
| } |
| |
| if (homedirs_->AreEphemeralUsersEnabled()) |
| homedirs_->RemoveNonOwnerCryptohomes(); |
| |
| RemovePkcs11Token(); |
| mount_type_ = MountType::NONE; |
| |
| platform_->ClearUserKeyring(); |
| |
| return true; |
| } |
| |
| bool Mount::IsMounted() const { |
| return (mounter_ && mounter_->MountPerformed()) || |
| (out_of_process_mounter_ && out_of_process_mounter_->MountPerformed()); |
| } |
| |
| bool Mount::IsNonEphemeralMounted() const { |
| return IsMounted() && mount_type_ != MountType::EPHEMERAL; |
| } |
| |
| bool Mount::OwnsMountPoint(const FilePath& path) const { |
| return (mounter_ && mounter_->IsPathMounted(path)) || |
| (out_of_process_mounter_ && |
| out_of_process_mounter_->IsPathMounted(path)); |
| } |
| |
| bool Mount::CreateTrackedSubdirectories(const std::string& username) const { |
| std::string obfuscated_username = |
| SanitizeUserNameWithSalt(username, system_salt_); |
| return mounter_->CreateTrackedSubdirectories(obfuscated_username, |
| mount_type_); |
| } |
| |
| bool Mount::MountGuestCryptohome() { |
| username_ = ""; |
| MountHelperInterface* ephemeral_mounter = nullptr; |
| base::Closure cleanup; |
| |
| if (mount_guest_session_out_of_process_) { |
| // Ephemeral cryptohomes for Guest sessions are mounted out-of-process. |
| ephemeral_mounter = out_of_process_mounter_.get(); |
| // This callback will be executed in the destructor at the latest so |
| // |out_of_process_mounter_| will always be valid. Error reporting is done |
| // in the helper process in cryptohome_namespace_mounter.cc. |
| cleanup = base::Bind( |
| base::IgnoreResult(&OutOfProcessMountHelper::TearDownEphemeralMount), |
| base::Unretained(out_of_process_mounter_.get())); |
| } else { |
| ephemeral_mounter = mounter_.get(); |
| // This callback will be executed in the destructor at the latest so |
| // |this| will always be valid. |
| cleanup = |
| base::Bind(&Mount::TearDownEphemeralMount, base::Unretained(this)); |
| } |
| |
| return MountEphemeralCryptohomeInternal(kGuestUserName, ephemeral_mounter, |
| std::move(cleanup)); |
| } |
| |
| FilePath Mount::GetUserDirectoryForUser( |
| const std::string& obfuscated_username) const { |
| return ShadowRoot().Append(obfuscated_username); |
| } |
| |
| FilePath Mount::GetUserTemporaryMountDirectory( |
| const std::string& obfuscated_username) const { |
| return mounter_->GetUserTemporaryMountDirectory(obfuscated_username); |
| } |
| |
| bool Mount::CheckChapsDirectory(const FilePath& dir) { |
| const Platform::Permissions kChapsDirPermissions = { |
| chaps_user_, // chaps |
| default_access_group_, // chronos-access |
| S_IRWXU | S_IRGRP | S_IXGRP // 0750 |
| }; |
| const Platform::Permissions kChapsFilePermissions = { |
| chaps_user_, // chaps |
| default_access_group_, // chronos-access |
| S_IRUSR | S_IWUSR | S_IRGRP // 0640 |
| }; |
| const Platform::Permissions kChapsSaltPermissions = { |
| 0, // root |
| 0, // root |
| S_IRUSR | S_IWUSR // 0600 |
| }; |
| |
| // If the Chaps database directory does not exist, create it. |
| if (!platform_->DirectoryExists(dir)) { |
| if (!platform_->CreateDirectory(dir)) { |
| LOG(ERROR) << "Failed to create " << dir.value(); |
| return false; |
| } |
| if (!platform_->SetOwnership(dir, kChapsDirPermissions.user, |
| kChapsDirPermissions.group, true)) { |
| LOG(ERROR) << "Couldn't set file ownership for " << dir.value(); |
| return false; |
| } |
| if (!platform_->SetPermissions(dir, kChapsDirPermissions.mode)) { |
| LOG(ERROR) << "Couldn't set permissions for " << dir.value(); |
| return false; |
| } |
| return true; |
| } |
| // Directory already exists so check permissions and log a warning |
| // if not as expected then attempt to apply correct permissions. |
| std::map<FilePath, Platform::Permissions> special_cases; |
| special_cases[dir.Append("auth_data_salt")] = kChapsSaltPermissions; |
| if (!platform_->ApplyPermissionsRecursive( |
| dir, kChapsFilePermissions, kChapsDirPermissions, special_cases)) { |
| LOG(ERROR) << "Chaps permissions failure."; |
| return false; |
| } |
| return true; |
| } |
| |
| bool Mount::InsertPkcs11Token() { |
| FilePath token_dir = homedirs_->GetChapsTokenDir(username_); |
| if (!CheckChapsDirectory(token_dir)) |
| return false; |
| // We may create a salt file and, if so, we want to restrict access to it. |
| brillo::ScopedUmask scoped_umask(kDefaultUmask); |
| |
| // Derive authorization data for the token from the passkey. |
| FilePath salt_file = homedirs_->GetChapsTokenSaltPath(username_); |
| |
| std::unique_ptr<chaps::TokenManagerClient> chaps_client( |
| chaps_client_factory_->New()); |
| |
| Pkcs11Init pkcs11init; |
| int slot_id = 0; |
| if (!chaps_client->LoadToken( |
| IsolateCredentialManager::GetDefaultIsolateCredential(), token_dir, |
| pkcs11_token_auth_data_, |
| pkcs11init.GetTpmTokenLabelForUser(username_), &slot_id)) { |
| LOG(ERROR) << "Failed to load PKCS #11 token."; |
| ReportCryptohomeError(kLoadPkcs11TokenFailed); |
| } |
| pkcs11_token_auth_data_.clear(); |
| ReportTimerStop(kPkcs11InitTimer); |
| return true; |
| } |
| |
| void Mount::RemovePkcs11Token() { |
| FilePath token_dir = homedirs_->GetChapsTokenDir(username_); |
| std::unique_ptr<chaps::TokenManagerClient> chaps_client( |
| chaps_client_factory_->New()); |
| chaps_client->UnloadToken( |
| IsolateCredentialManager::GetDefaultIsolateCredential(), token_dir); |
| } |
| |
| base::Value Mount::GetStatus(int active_key_index) { |
| base::Value dv(base::Value::Type::DICTIONARY); |
| std::string user = SanitizeUserNameWithSalt(username_, system_salt_); |
| base::Value keysets(base::Value::Type::LIST); |
| std::vector<int> key_indices; |
| if (user.length() && |
| homedirs_->keyset_management()->GetVaultKeysets(user, &key_indices)) { |
| for (auto key_index : key_indices) { |
| base::Value keyset_dict(base::Value::Type::DICTIONARY); |
| std::unique_ptr<VaultKeyset> keyset( |
| homedirs_->keyset_management()->LoadVaultKeysetForUser(user, |
| key_index)); |
| if (keyset.get()) { |
| bool tpm = |
| keyset->serialized().flags() & SerializedVaultKeyset::TPM_WRAPPED; |
| bool scrypt = keyset->serialized().flags() & |
| SerializedVaultKeyset::SCRYPT_WRAPPED; |
| keyset_dict.SetBoolKey("tpm", tpm); |
| keyset_dict.SetBoolKey("scrypt", scrypt); |
| keyset_dict.SetBoolKey("ok", true); |
| keyset_dict.SetIntKey("last_activity", |
| keyset->serialized().last_activity_timestamp()); |
| if (keyset->serialized().has_key_data()) { |
| // TODO(wad) Add additional KeyData |
| keyset_dict.SetStringKey("label", |
| keyset->serialized().key_data().label()); |
| } |
| } else { |
| keyset_dict.SetBoolKey("ok", false); |
| } |
| // TODO(wad) Replace key_index use with key_label() use once |
| // legacy keydata is populated. |
| if (mount_type_ != MountType::EPHEMERAL && key_index == active_key_index) |
| keyset_dict.SetBoolKey("current", true); |
| keyset_dict.SetIntKey("index", key_index); |
| keysets.Append(std::move(keyset_dict)); |
| } |
| } |
| dv.SetKey("keysets", std::move(keysets)); |
| dv.SetBoolKey("mounted", IsMounted()); |
| std::string obfuscated_owner; |
| homedirs_->GetOwner(&obfuscated_owner); |
| dv.SetStringKey("owner", obfuscated_owner); |
| dv.SetBoolKey("enterprise", homedirs_->enterprise_owned()); |
| |
| std::string mount_type_string; |
| switch (mount_type_) { |
| case MountType::NONE: |
| mount_type_string = "none"; |
| break; |
| case MountType::ECRYPTFS: |
| mount_type_string = "ecryptfs"; |
| break; |
| case MountType::DIR_CRYPTO: |
| mount_type_string = "dircrypto"; |
| break; |
| case MountType::EPHEMERAL: |
| mount_type_string = "ephemeral"; |
| break; |
| } |
| dv.SetStringKey("type", mount_type_string); |
| |
| return dv; |
| } |
| |
| bool Mount::MigrateToDircrypto( |
| const dircrypto_data_migrator::MigrationHelper::ProgressCallback& callback, |
| MigrationType migration_type) { |
| std::string obfuscated_username = |
| SanitizeUserNameWithSalt(username_, system_salt_); |
| FilePath temporary_mount = |
| GetUserTemporaryMountDirectory(obfuscated_username); |
| if (!IsMounted() || mount_type_ != MountType::DIR_CRYPTO || |
| !platform_->DirectoryExists(temporary_mount) || |
| !mounter_->IsPathMounted(temporary_mount)) { |
| LOG(ERROR) << "Not mounted for eCryptfs->dircrypto migration."; |
| return false; |
| } |
| // Do migration. |
| constexpr uint64_t kMaxChunkSize = 128 * 1024 * 1024; |
| dircrypto_data_migrator::MigrationHelper migrator( |
| platform_, temporary_mount, mount_point_, |
| GetUserDirectoryForUser(obfuscated_username), kMaxChunkSize, |
| migration_type); |
| { // Abort if already cancelled. |
| base::AutoLock lock(active_dircrypto_migrator_lock_); |
| if (is_dircrypto_migration_cancelled_) |
| return false; |
| CHECK(!active_dircrypto_migrator_); |
| active_dircrypto_migrator_ = &migrator; |
| } |
| bool success = migrator.Migrate(callback); |
| // This closure will be run immediately so |mounter_| will be valid. |
| UnmountAndDropKeys(base::BindOnce(&MountHelper::TearDownNonEphemeralMount, |
| base::Unretained(mounter_.get()))); |
| { // Signal the waiting thread. |
| base::AutoLock lock(active_dircrypto_migrator_lock_); |
| active_dircrypto_migrator_ = nullptr; |
| dircrypto_migration_stopped_condition_.Signal(); |
| } |
| if (!success) { |
| LOG(ERROR) << "Failed to migrate."; |
| return false; |
| } |
| // Clean up. |
| FilePath vault_path = GetEcryptfsUserVaultPath(obfuscated_username); |
| if (!platform_->DeletePathRecursively(temporary_mount) || |
| !platform_->DeletePathRecursively(vault_path)) { |
| LOG(ERROR) << "Failed to delete the old vault."; |
| return false; |
| } |
| return true; |
| } |
| |
| void Mount::MaybeCancelActiveDircryptoMigrationAndWait() { |
| base::AutoLock lock(active_dircrypto_migrator_lock_); |
| is_dircrypto_migration_cancelled_ = true; |
| while (active_dircrypto_migrator_) { |
| active_dircrypto_migrator_->Cancel(); |
| LOG(INFO) << "Waiting for dircrypto migration to stop."; |
| dircrypto_migration_stopped_condition_.Wait(); |
| LOG(INFO) << "Dircrypto migration stopped."; |
| } |
| } |
| |
| bool Mount::IsShadowOnly() const { |
| return shadow_only_; |
| } |
| } // namespace cryptohome |
