| // Copyright 2015 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. |
| |
| #ifndef CRYPTOHOME_TPM2_IMPL_H_ |
| #define CRYPTOHOME_TPM2_IMPL_H_ |
| |
| #include <stdint.h> |
| |
| #include <map> |
| #include <memory> |
| #include <set> |
| #include <string> |
| |
| #include <base/macros.h> |
| #include <base/threading/platform_thread.h> |
| #include <base/threading/thread.h> |
| #include <tpm_manager/client/tpm_manager_utility.h> |
| #include <tpm_manager/proto_bindings/tpm_manager.pb.h> |
| #include <trunks/error_codes.h> |
| #include <trunks/hmac_session.h> |
| #include <trunks/tpm_generated.h> |
| #include <trunks/tpm_state.h> |
| #include <trunks/tpm_utility.h> |
| #include <trunks/trunks_factory.h> |
| #include <trunks/trunks_factory_impl.h> |
| |
| #include "cryptohome/le_credential_backend.h" |
| #include "cryptohome/pinweaver_le_credential_backend.h" |
| #include "cryptohome/signature_sealing_backend_tpm2_impl.h" |
| #include "cryptohome/tpm.h" |
| |
| namespace trunks { |
| |
| class AuthorizationDelegate; |
| |
| } // namespace trunks |
| |
| namespace cryptohome { |
| |
| const uint32_t kDefaultTpmRsaModulusSize = 2048; |
| const uint32_t kDefaultTpmPublicExponent = 0x10001; |
| |
| class Tpm2Impl : public Tpm { |
| public: |
| // This object may be used across multiple threads but the Trunks D-Bus proxy |
| // can only be used on a single thread. This structure holds all Trunks client |
| // objects for a particular thread. |
| struct TrunksClientContext { |
| trunks::TrunksFactory* factory; |
| std::unique_ptr<trunks::TrunksFactoryImpl> factory_impl; |
| std::unique_ptr<trunks::TpmState> tpm_state; |
| std::unique_ptr<trunks::TpmUtility> tpm_utility; |
| }; |
| |
| Tpm2Impl() = default; |
| // Does not take ownership of pointers. |
| Tpm2Impl(trunks::TrunksFactory* factory, |
| tpm_manager::TpmManagerUtility* tpm_manager_utility); |
| Tpm2Impl(const Tpm2Impl&) = delete; |
| Tpm2Impl& operator=(const Tpm2Impl&) = delete; |
| |
| virtual ~Tpm2Impl() = default; |
| |
| // Tpm methods |
| TpmVersion GetVersion() override { return TpmVersion::TPM_2_0; } |
| hwsec::error::TPMErrorBase EncryptBlob( |
| TpmKeyHandle key_handle, |
| const brillo::SecureBlob& plaintext, |
| const brillo::SecureBlob& key, |
| brillo::SecureBlob* ciphertext) override; |
| hwsec::error::TPMErrorBase DecryptBlob( |
| TpmKeyHandle key_handle, |
| const brillo::SecureBlob& ciphertext, |
| const brillo::SecureBlob& key, |
| const std::map<uint32_t, std::string>& pcr_map, |
| brillo::SecureBlob* plaintext) override; |
| hwsec::error::TPMErrorBase SealToPcrWithAuthorization( |
| const brillo::SecureBlob& plaintext, |
| const brillo::SecureBlob& auth_value, |
| const std::map<uint32_t, std::string>& pcr_map, |
| brillo::SecureBlob* sealed_data) override; |
| hwsec::error::TPMErrorBase PreloadSealedData( |
| const brillo::SecureBlob& sealed_data, |
| ScopedKeyHandle* preload_handle) override; |
| hwsec::error::TPMErrorBase UnsealWithAuthorization( |
| base::Optional<TpmKeyHandle> preload_handle, |
| const brillo::SecureBlob& sealed_data, |
| const brillo::SecureBlob& auth_value, |
| const std::map<uint32_t, std::string>& pcr_map, |
| brillo::SecureBlob* plaintext) override; |
| hwsec::error::TPMErrorBase GetPublicKeyHash( |
| TpmKeyHandle key_handle, brillo::SecureBlob* hash) override; |
| bool GetOwnerPassword(brillo::SecureBlob* owner_password) override; |
| bool IsEnabled() override; |
| bool IsOwned() override; |
| bool IsOwnerPasswordPresent() override; |
| bool HasResetLockPermissions() override; |
| bool PerformEnabledOwnedCheck(bool* enabled, bool* owned) override; |
| bool GetRandomDataBlob(size_t length, brillo::Blob* data) override; |
| bool GetRandomDataSecureBlob(size_t length, |
| brillo::SecureBlob* data) override; |
| bool GetAlertsData(Tpm::AlertsData* alerts) override; |
| bool DefineNvram(uint32_t index, size_t length, uint32_t flags) override; |
| bool DestroyNvram(uint32_t index) override; |
| bool WriteNvram(uint32_t index, const brillo::SecureBlob& blob) override; |
| bool OwnerWriteNvram(uint32_t index, const brillo::SecureBlob& blob) override; |
| bool ReadNvram(uint32_t index, brillo::SecureBlob* blob) override; |
| bool IsNvramDefined(uint32_t index) override; |
| bool IsNvramLocked(uint32_t index) override; |
| bool WriteLockNvram(uint32_t index) override; |
| unsigned int GetNvramSize(uint32_t index) override; |
| bool SealToPCR0(const brillo::SecureBlob& value, |
| brillo::SecureBlob* sealed_value) override; |
| bool Unseal(const brillo::SecureBlob& sealed_value, |
| brillo::SecureBlob* value) override; |
| bool CreateDelegate(const std::set<uint32_t>& bound_pcrs, |
| uint8_t delegate_family_label, |
| uint8_t delegate_label, |
| brillo::Blob* delegate_blob, |
| brillo::Blob* delegate_secret) override; |
| bool Sign(const brillo::SecureBlob& key_blob, |
| const brillo::SecureBlob& input, |
| uint32_t bound_pcr_index, |
| brillo::SecureBlob* signature) override; |
| bool CreatePCRBoundKey(const std::map<uint32_t, std::string>& pcr_map, |
| AsymmetricKeyUsage key_type, |
| brillo::SecureBlob* key_blob, |
| brillo::SecureBlob* public_key_der, |
| brillo::SecureBlob* creation_blob) override; |
| bool VerifyPCRBoundKey(const std::map<uint32_t, std::string>& pcr_map, |
| const brillo::SecureBlob& key_blob, |
| const brillo::SecureBlob& creation_blob) override; |
| bool ExtendPCR(uint32_t pcr_index, const brillo::Blob& extension) override; |
| bool ReadPCR(uint32_t pcr_index, brillo::Blob* pcr_value) override; |
| bool IsEndorsementKeyAvailable() override; |
| bool CreateEndorsementKey() override; |
| bool TakeOwnership(int max_timeout_tries, |
| const brillo::SecureBlob& owner_password) override; |
| bool WrapRsaKey(const brillo::SecureBlob& public_modulus, |
| const brillo::SecureBlob& prime_factor, |
| brillo::SecureBlob* wrapped_key) override; |
| hwsec::error::TPMErrorBase LoadWrappedKey( |
| const brillo::SecureBlob& wrapped_key, |
| ScopedKeyHandle* key_handle) override; |
| bool LegacyLoadCryptohomeKey(ScopedKeyHandle* key_handle, |
| brillo::SecureBlob* key_blob) override; |
| void CloseHandle(TpmKeyHandle key_handle) override; |
| void GetStatus(base::Optional<TpmKeyHandle> key, |
| TpmStatusInfo* status) override; |
| base::Optional<bool> IsSrkRocaVulnerable() override; |
| bool GetDictionaryAttackInfo(int* counter, |
| int* threshold, |
| bool* lockout, |
| int* seconds_remaining) override; |
| // Asynchronously resets DA lock in tpm_managerd. |
| bool ResetDictionaryAttackMitigation( |
| const brillo::Blob& /* delegate_blob */, |
| const brillo::Blob& /* delegate_secret */) override; |
| void DeclareTpmFirmwareStable() override; |
| bool RemoveOwnerDependency(Tpm::TpmOwnerDependency dependency) override; |
| bool ClearStoredPassword() override; |
| bool GetVersionInfo(TpmVersionInfo* version_info) override; |
| bool GetIFXFieldUpgradeInfo(IFXFieldUpgradeInfo* info) override; |
| bool GetRsuDeviceId(std::string* device_id) override; |
| LECredentialBackend* GetLECredentialBackend() override; |
| SignatureSealingBackend* GetSignatureSealingBackend() override; |
| bool GetDelegate(brillo::Blob* blob, |
| brillo::Blob* secret, |
| bool* has_reset_lock_permissions) override; |
| |
| // Gets the trunks objects for the current thread, initializing new ones if |
| // necessary. Returns true on success. |
| bool GetTrunksContext(TrunksClientContext** trunks); |
| |
| // Loads the key from its DER-encoded Subject Public Key Info. Key is of type |
| // |key_type|. Algorithm scheme and hashing algorithm are passed via |scheme| |
| // and |hash_alg|. Currently, only the RSA keys are supported. |
| // The loaded key handle is returned via |key_handle|. |
| bool LoadPublicKeyFromSpki(const brillo::Blob& public_key_spki_der, |
| AsymmetricKeyUsage key_type, |
| trunks::TPM_ALG_ID scheme, |
| trunks::TPM_ALG_ID hash_alg, |
| trunks::AuthorizationDelegate* session_delegate, |
| ScopedKeyHandle* key_handle); |
| |
| base::Optional<bool> IsDelegateBoundToPcr() override; |
| bool DelegateCanResetDACounter() override; |
| std::map<uint32_t, std::string> GetPcrMap( |
| const std::string& obfuscated_username, |
| bool use_extended_pcr) const override; |
| |
| // Derives the |auth_value| by decrypting the |pass_blob| using |key_handle| |
| // and hashing the result. The input |pass_blob| must have 256 bytes, the |
| // size of cryptohome key modulus. |
| hwsec::error::TPMErrorBase GetAuthValue( |
| base::Optional<TpmKeyHandle> key_handle, |
| const brillo::SecureBlob& pass_blob, |
| brillo::SecureBlob* auth_value) override; |
| |
| private: |
| // Initializes |tpm_manager_utility_|; returns |true| iff successful. |
| bool InitializeTpmManagerUtility(); |
| |
| // Calls |TpmManagerUtility::GetTpmStatus| and stores the result into |
| // |is_enabled_|, |is_owned_|, and |last_tpm_manager_data_| for later use. |
| bool CacheTpmManagerStatus(); |
| |
| // This method given a Tpm generated public area, returns the DER encoded |
| // public key. |
| bool PublicAreaToPublicKeyDER(const trunks::TPMT_PUBLIC& public_area, |
| brillo::SecureBlob* public_key_der); |
| |
| // Updates tpm_status_ according to the requested |refresh_type|. Returns |
| // true on success. Use |REFRESH_IF_NEEDED| for most calls. Use |
| // |FORCE_REFRESH| for calls which are querying a field that can change at any |
| // time, like the dictionary attack counter. |
| enum class RefreshType { REFRESH_IF_NEEDED, FORCE_REFRESH }; |
| bool UpdateTpmStatus(RefreshType refresh_type); |
| |
| // wrapped tpm_manager proxy to get information from |tpm_manager|. |
| tpm_manager::TpmManagerUtility* tpm_manager_utility_{nullptr}; |
| |
| // Per-thread trunks object management. |
| std::map<base::PlatformThreadId, std::unique_ptr<TrunksClientContext>> |
| trunks_contexts_; |
| |
| // Used to provide thread-safe access to trunks_contexts_. |
| base::Lock trunks_contexts_lock_; |
| |
| TrunksClientContext external_trunks_context_; |
| bool has_external_trunks_context_ = false; |
| |
| // Cache of TPM version info, base::nullopt if cache doesn't exist. |
| base::Optional<TpmVersionInfo> version_info_; |
| |
| // True, if the tpm firmware has been already successfully declared stable. |
| bool fw_declared_stable_ = false; |
| |
| // Indicates if the TPM is already enabled. |
| bool is_enabled_ = false; |
| |
| // Indicates if the TPM is already owned. |
| bool is_owned_ = false; |
| |
| // This flag indicates |CacheTpmManagerStatus| shall be called when the |
| // ownership taken signal is confirmed to be connected. |
| bool shall_cache_tpm_manager_status_ = true; |
| |
| // Records |LocalData| from tpm_manager last time we query, either by |
| // explicitly requesting the update or from dbus signal. |
| tpm_manager::LocalData last_tpm_manager_data_; |
| |
| #if USE_PINWEAVER |
| PinweaverLECredentialBackend le_credential_backend_{this}; |
| #endif |
| SignatureSealingBackendTpm2Impl signature_sealing_backend_{this}; |
| }; |
| |
| } // namespace cryptohome |
| |
| #endif // CRYPTOHOME_TPM2_IMPL_H_ |
