Merge "IFace: update comments" into sc-dev am: 4d00d917b6 (11145fa8) · Commits · e / os / android_hardware_interfaces

biometrics/face/aidl/android/hardware/biometrics/face/IFace.aidl

+12 −10

Original line number	Diff line number	Diff line
		@@ -25,28 +25,30 @@ interface IFace {
		/**
		* getSensorProps:
		*
		* @return A list of properties for all face sensors available to the HAL.
		* @return A list of properties for all of the face sensors supported by the HAL.
		*/
		SensorProps[] getSensorProps();

		/**
		* createSession:
		*
		* Creates a session that can be used by the framework to perform operations such as
		* enroll, authenticate, etc. for the given sensorId and userId.
		* Creates an instance of ISession that can be used by the framework to perform operations such
		* as ISession#enroll, ISession#authenticate, etc. for the given sensorId and userId.
		*
		* Calling this method while there is an active session is considered an error. If the
		* framework is in a bad state and for some reason cannot close its session, it should use
		* the reset method below.
		* Calling this method while there is an active session is considered an error. If the framework
		* wants to create a new session when it already has an active session, it must first cancel the
		* current operation if it's cancellable or wait until it completes. Then, the framework must
		* explicitly close the session with ISession#close. Once the framework receives
		* ISessionCallback#onSessionClosed, a new session can be created.
		*
		* Implementations must store user-specific state or metadata in /data/vendor_de/<user>/facedata
		* as specified by the SELinux policy. The directory /data/vendor_de is managed by vold (see
		* vold_prepare_subdirs.cpp). Implementations may store additional user-specific data, such as
		* embeddings or templates in StrongBox.
		* embeddings or templates, in StrongBox.
		*
		* @param sensorId The sensorId with which this session is being created.
		* @param userId The userId with which this session is being created.
		* @param cb A callback to notify the framework about the session's results and events.
		* @param sensorId The sensorId for which this session is being created.
		* @param userId The userId for which this session is being created.
		* @param cb A callback to notify the framework about the session's events.
		* @return A new session.
		*/
		ISession createSession(in int sensorId, in int userId, in ISessionCallback cb);

biometrics/face/aidl/android/hardware/biometrics/face/ISession.aidl

+122 −70

Original line number	Diff line number	Diff line
		@@ -24,7 +24,6 @@ import android.hardware.common.NativeHandle;
		import android.hardware.keymaster.HardwareAuthToken;

		/**
		* Operations that can be performed for unique sessions retrieved via IFace#createSession.
		* Operations defined within this interface can be divided into the following categories:
		* 1) Cancellable operations. These are usually the operations that can execute for several
		* minutes. To allow for cancellation, they return an instance of ICancellationSignal that
		@@ -83,15 +82,20 @@ interface ISession {
		* \| 0 \| 10 \| <Time4> \| <Random4> \|
		* ----------------------------------------------
		*
		* Callbacks that signify the end of this operation's lifecycle:
		* - ISessionCallback#onChallengeGenerated
		*
		*/
		void generateChallenge();

		/**
		* revokeChallenge:
		*
		* Revokes a challenge that was previously generated. Note that if an invalid combination of
		* parameters is requested, the implementation must still notify the framework using the
		* provided callback.
		* Revokes a challenge that was previously generated. Note that if a non-existent challenge is
		* provided, the HAL must still notify the framework using ISessionCallback#onChallengeRevoked.
		*
		* Callbacks that signify the end of this operation's lifecycle:
		* - ISessionCallback#onChallengeRevoked
		*
		* @param challenge Challenge that should be revoked.
		*/
		@@ -100,9 +104,9 @@ interface ISession {
		/**
		* getEnrollmentConfig:
		*
		* Returns the enrollment configuration depending on the provided enrollment type. Enrollment
		* configuration determines how many stages the enrollment will have and the requirements for
		* each of the stages.
		* Returns the enrollment configuration for the provided enrollment type. Enrollment
		* configuration determines how many stages the enrollment will have and the requirements
		* for each of the stages.
		*
		* @param enrollmentType See the EnrollmentType enum.
		* @return An EnrollmentStageConfig array that describes each enrollment stage.
		@@ -117,22 +121,28 @@ interface ISession {
		* At any point during enrollment, if a non-recoverable error occurs, the HAL must notify the
		* framework via ISessionCallback#onError with the applicable enrollment-specific error.
		*
		* Before capturing face data, the implementation must first verify the authenticity and
		* integrity of the provided HardwareAuthToken. In addition, it must check that the challenge
		* within the provided HardwareAuthToken is valid. See ISession#generateChallenge. If any of
		* the above checks fail, the framework must be notified using ISessionCallback#onError with
		* Error::UNABLE_TO_PROCESS.
		* Before capturing face data, the HAL must first verify the authenticity and integrity of the
		* provided HardwareAuthToken. In addition, it must check that the challenge within the provided
		* HardwareAuthToken is valid. See ISession#generateChallenge. If any of the above checks fail,
		* the framework must be notified using ISessionCallback#onError with Error::UNABLE_TO_PROCESS.
		*
		* During enrollment, the implementation may notify the framework via
		* ISessionCallback#onAcquired with messages that may be used to guide the user. This callback
		* can be invoked multiple times if necessary. Similarly, the framework may be notified of
		* enrollment progress changes via ISessionCallback#onEnrollmentProgress. Once the framework is
		* notified that there are 0 "remaining" steps, the framework may cache the "enrollmentId". See
		* During enrollment, the HAL may notify the framework via ISessionCallback#onAcquired with
		* messages that may be used to guide the user. This callback can be invoked multiple times if
		* necessary. Similarly, the framework may be notified of enrollment progress changes via
		* ISessionCallback#onEnrollmentProgress. Once the framework is notified that there are 0
		* "remaining" steps, the framework may cache the "enrollmentId". See
		* ISessionCallback#onEnrollmentProgress for more info.
		*
		* When a face is successfully added and before the framework is notified of remaining=0, the
		* implementation MUST update and associate this (sensorId, userId) pair with a new
		* entropy-encoded random identifier. See ISession#getAuthenticatorId for more information.
		* HAL must update and associate this (sensorId, userId) pair with a new entropy-encoded random
		* identifier. See ISession#getAuthenticatorId for more information.
		*
		* Callbacks that signify the end of this operation's lifecycle:
		* - ISessionCallback#onError
		* - ISessionCallback#onEnrollmentProgress(enrollmentId, remaining=0)
		*
		* Other applicable callbacks:
		* - ISessionCallback#onAcquired
		*
		* @param hat See above documentation.
		* @param enrollmentType See the EnrollmentType enum.
		@@ -154,15 +164,18 @@ interface ISession {
		* At any point during authentication, if a non-recoverable error occurs, the HAL must notify
		* the framework via ISessionCallback#onError with the applicable authentication-specific error.
		*
		* During authentication, the implementation may notify the framework via
		* ISessionCallback#onAcquired with messages that may be used to guide the user. This callback
		* can be invoked multiple times if necessary.
		* During authentication, the HAL may notify the framework via ISessionCallback#onAcquired with
		* messages that may be used to guide the user. This callback can be invoked multiple times if
		* necessary.
		*
		* The HAL must notify the framework of accepts/rejects via ISessionCallback#onAuthentication*.
		* The HAL must notify the framework of accepts/rejects via
		* ISessionCallback#onAuthenticationSucceeded and ISessionCallback#onAuthenticationFailed,
		* correspondingly.
		*
		* The authentication lifecycle ends when either
		* 1) A face is accepted, and ISessionCallback#onAuthenticationSucceeded is invoked, or
		* 2) Any non-recoverable error occurs (such as lockout). See the full list of
		* The authentication lifecycle ends when any of the following happens:
		* 1) A face is accepted, and ISessionCallback#onAuthenticationSucceeded is invoked.
		* 2) A face is rejected, and ISessionCallback#onAuthenticationFailed is invoked.
		* 3) Any non-recoverable error occurs (such as lockout). See the full list of
		* authentication-specific errors in the Error enum.
		*
		* Note that upon successful authentication, the lockout counter for this (sensorId, userId)
		@@ -174,16 +187,26 @@ interface ISession {
		* must be set with the operationId passed in during #authenticate. If the sensor is NOT
		* SensorStrength::STRONG, the HardwareAuthToken MUST be null.
		*
		* Callbacks that signify the end of this operation's lifecycle:
		* - ISessionCallback#onError
		* - ISessionCallback#onAuthenticationSucceeded
		* - ISessionCallback#onAuthenticationFailed
		*
		* Other applicable callbacks:
		* - ISessionCallback#onAcquired
		* - ISessionCallback#onLockoutTimed
		* - ISessionCallback#onLockoutPermanent
		*
		* @param operationId For sensors configured as SensorStrength::STRONG, this must be used ONLY
		* upon successful authentication and wrapped in the HardwareAuthToken's
		* "challenge" field and sent to the framework via
		* ISessionCallback#onAuthenticated. The operationId is an opaque identifier
		* created from a separate secure subsystem such as, but not limited to
		* KeyStore/KeyMaster. The HardwareAuthToken can then be used as an
		* attestation for the provided operation. For example, this is used
		* to unlock biometric-bound auth-per-use keys (see
		* ISessionCallback#onAuthenticationSucceeded. The operationId is an opaque
		* identifier created from a separate secure subsystem such as, but not
		* limited to KeyStore/KeyMaster. The HardwareAuthToken can then be used as
		* an attestation for the provided operation. For example, this is used to
		* unlock biometric-bound auth-per-use keys (see
		* setUserAuthenticationParameters in KeyGenParameterSpec.Builder and
		* KeyProtection.Builder.
		* KeyProtection.Builder).
		* @return ICancellationSignal An object that can be used by the framework to cancel this
		* operation.
		*/
		@@ -193,32 +216,36 @@ interface ISession {
		* detectInteraction:
		*
		* A request to start looking for faces without performing matching. Must only be called if
		* SensorProps#supportsDetectInteraction is true. If invoked on implementations that do not
		* support this functionality, the HAL must respond with ISession#onError(UNABLE_TO_PROCESS, 0).
		* SensorProps#supportsDetectInteraction is true. If invoked on HALs that do not support this
		* functionality, the HAL must respond with ISession#onError(UNABLE_TO_PROCESS, 0).
		*
		* The framework will use this method in cases where determing user presence is required, but
		* identifying/authentication is not. For example, when the device is encrypted (first boot) or
		* in lockdown mode.
		* The framework will use this operation in cases where determining user presence is required,
		* but identifying/authenticating is not. For example, when the device is encrypted (first boot)
		* or in lockdown mode.
		*
		* At any point during detectInteraction, if a non-recoverable error occurs, the HAL must notify
		* the framework via ISessionCallback#onError with the applicable error.
		*
		* The implementation must only check for a face-like image was detected (e.g. to
		* minimize interactions due to non-face objects), and the lockout counter must not
		* be modified.
		* The HAL must only check whether a face-like image was detected (e.g. to minimize interactions
		* due to non-face objects), and the lockout counter must not be modified.
		*
		* Upon detecting any face, the implementation must invoke
		* ISessionCallback#onInteractionDetected.
		* Upon detecting any face, the HAL must invoke ISessionCallback#onInteractionDetected.
		*
		* The lifecycle of this operation ends when either
		* The lifecycle of this operation ends when either:
		* 1) Any face is detected and the framework is notified via
		* ISessionCallback#onInteractiondetected
		* 2) The operation was cancelled by the framework (see ICancellationSignal)
		* 3) An error occurred, for example ERROR::TIMEOUT
		* ISessionCallback#onInteractionDetected.
		* 2) An error occurrs, for example Error::TIMEOUT.
		*
		* Note that if the operation is canceled, the implementation must notify the framework via
		* Note that if the operation is canceled, the HAL must notify the framework via
		* ISessionCallback#onError with Error::CANCELED.
		*
		* Callbacks that signify the end of this operation's lifecycle:
		* - ISessionCallback#onError
		* - ISessionCallback#onInteractionDetected
		*
		* Other applicable callbacks:
		* - ISessionCallback#onAcquired
		*
		* @return ICancellationSignal An object that can be used by the framework to cancel this
		* operation.
		*/
		@@ -227,12 +254,14 @@ interface ISession {
		/*
		* enumerateEnrollments:
		*
		* A request to enumerate (list) the enrollments for this (sensorId, userId) pair. The
		* framework typically uses this to ensure that its cache is in sync with the HAL.
		* A request to enumerate (list) the enrollments for this (sensorId, userId) pair. The framework
		* typically uses this to ensure that its cache is in sync with the HAL.
		*
		* The implementation must then notify the framework with a list of enrollments applicable
		* for the current session via ISessionCallback#onEnrollmentsEnumerated.
		* The HAL must then notify the framework with a list of enrollments applicable for the current
		* session via ISessionCallback#onEnrollmentsEnumerated.
		*
		* Callbacks that signify the end of this operation's lifecycle:
		* - ISessionCallback#onEnrollmentsEnumerated
		*/
		void enumerateEnrollments();

		@@ -242,8 +271,12 @@ interface ISession {
		* A request to remove the enrollments for this (sensorId, userId) pair.
		*
		* After removing the enrollmentIds from everywhere necessary (filesystem, secure subsystems,
		* etc), the implementation must notify the framework via ISessionCallback#onEnrollmentsRemoved.
		* etc), the HAL must notify the framework via ISessionCallback#onEnrollmentsRemoved.
		*
		* Callbacks that signify the end of this operation's lifecycle:
		* - ISessionCallback#onEnrollmentsRemoved
		*
		* @param enrollmentIds a list of enrollments that should be removed.
		*/
		void removeEnrollments(in int[] enrollmentIds);

		@@ -257,6 +290,10 @@ interface ISession {
		*
		* The HAL must notify the framework about the result by calling
		* ISessionCallback#onFeaturesRetrieved.
		*
		* Callbacks that signify the end of this operation's lifecycle:
		* - ISessionCallback#onError
		* - ISessionCallback#onFeaturesRetrieved
		*/
		void getFeatures();

		@@ -264,15 +301,19 @@ interface ISession {
		* setFeature:
		*
		* Enables or disables a feature for this (sensorId, userId) pair. Because certain features may
		* decrease security, the user must enter their password before this method is invoked
		* (see @param hat). The HAL must verify the hat before changing any feature state.
		* decrease security, the user must enter their password before this operation is invoked
		* (see @param hat). The HAL must verify the HAT before changing any feature state.
		*
		* If the hat is invalid or if the user is not enrolled, the HAL must invoke
		* If the HAT is invalid or if the user is not enrolled, the HAL must invoke
		* ISessionCallback#onError with Error::UNABLE_TO_PROCESS.
		*
		* After the feature is successfully set, the HAL must notify the framework by calling
		* ISessionCallback#onFeatureSet.
		*
		* Callbacks that signify the end of this operation's lifecycle:
		* - ISessionCallback#onError
		* - ISessionCallback#onFeatureSet
		*
		* @param hat HardwareAuthToken See above documentation.
		* @param feature The feature to be enabled or disabled.
		* @param enabled Whether the provided features should be enabled or disabled.
		@@ -295,8 +336,8 @@ interface ISession {
		* KeyProtection.Builder.setInvalidatedByBiometricEnrollment.
		*
		* In addition, upon successful face authentication, the signed HAT that is returned to
		* the framework via ISessionCallback#onAuthenticated must contain this identifier in the
		* authenticatorId field.
		* the framework via ISessionCallback#onAuthenticationSucceeded must contain this identifier in
		* the authenticatorId field.
		*
		* Returns an entropy-encoded random identifier associated with the current set of enrollments
		* via ISessionCallback#onAuthenticatorIdRetrieved. The authenticatorId
		@@ -305,20 +346,21 @@ interface ISession {
		* 3) MUST not change if a face is deleted.
		* 4) MUST be an entropy-encoded random number
		*
		* Callbacks that signify the end of this operation's lifecycle:
		* - ISessionCallback#onAuthenticatorIdRetrieved
		*/
		void getAuthenticatorId();

		/**
		* invalidateAuthenticatorId:
		*
		* This method only applies to sensors that are configured as SensorStrength::STRONG. If invoked
		* by the framework for sensor of other strengths, the HAL should immediately invoke
		* This operation only applies to sensors that are configured as SensorStrength::STRONG. If
		* invoked by the framework for sensors of other strengths, the HAL should immediately invoke
		* ISessionCallback#onAuthenticatorIdInvalidated.
		*
		* The following only applies to sensors that are configured as SensorStrength::STRONG.
		*
		* When invoked by the framework, the implementation must perform the following sequence of
		* events:
		* When invoked by the framework, the HAL must perform the following sequence of events:
		* 1) Update the authenticatorId with a new entropy-encoded random number
		* 2) Persist the new authenticatorId to non-ephemeral storage
		* 3) Notify the framework that the above is completed, via
		@@ -326,18 +368,20 @@ interface ISession {
		*
		* A practical use case of invalidation would be when the user adds a new enrollment to a sensor
		* managed by a different HAL instance. The public android.security.keystore APIs bind keys to
		* "all biometrics" rather than "face-only" or "face-only" (see #getAuthenticatorId
		* for more details). As such, the framework would coordinate invalidation across multiple
		* biometric HALs as necessary.
		* "all biometrics" rather than "fingerprint-only" or "face-only" (see #getAuthenticatorId for
		* more details). As such, the framework would coordinate invalidation across multiple biometric
		* HALs as necessary.
		*
		* Callbacks that signify the end of this operation's lifecycle:
		* - ISessionCallback#onAuthenticatorIdInvalidated
		*/
		void invalidateAuthenticatorId();

		/**
		* resetLockout:
		*
		* Requests the implementation to clear the lockout counter. Upon receiving this request, the
		* implementation must perform the following:
		* Requests the HAL to clear the lockout counter. Upon receiving this request, the HAL must
		* perform the following:
		* 1) Verify the authenticity and integrity of the provided HAT
		* 2) Verify that the timestamp provided within the HAT is relatively recent (e.g. on the
		* order of minutes, not hours).
		@@ -373,6 +417,9 @@ interface ISession {
		* See the Android CDD section 7.3.10 for the full set of lockout and rate-limiting
		* requirements.
		*
		* Callbacks that signify the end of this operation's lifecycle:
		* - ISessionCallback#onLockoutCleared
		*
		* @param hat HardwareAuthToken See above documentation.
		*/
		void resetLockout(in HardwareAuthToken hat);
		@@ -384,9 +431,14 @@ interface ISession {
		* If the HAL is busy performing a cancellable operation, the operation must be explicitly
		* cancelled with a call to ICancellationSignal#cancel before the session can be closed.
		*
		* After a session is closed, the HAL must notify the framework by calling
		* ISessionCallback#onSessionClosed.
		*
		* All sessions must be explicitly closed. Calling IFace#createSession while there is an active
		* session is considered an error.
		*
		* Callbacks that signify the end of this operation's lifecycle:
		* - ISessionCallback#onSessionClosed
		*/
		void close();
		}

biometrics/face/aidl/android/hardware/biometrics/face/ISessionCallback.aidl

+13 −13

Original line number	Diff line number	Diff line
		@@ -37,11 +37,11 @@ interface ISessionCallback {

		/**
		* This method must only be used to notify the framework during the following operations:
		* 1) ISession#authenticate
		* 2) ISession#detectInteraction
		* - ISession#authenticate
		* - ISession#detectInteraction
		*
		* These messages may be used to provide user guidance multiple times if necessary per
		* operation.
		* These messages may be used to provide user guidance multiple times per operation if
		* necessary.
		*
		* @param frame See the AuthenticationFrame enum.
		*/
		@@ -51,8 +51,8 @@ interface ISessionCallback {
		* This method must only be used to notify the framework during the ISession#enroll
		* operation.
		*
		* These messages may be used to provide user guidance multiple times if necessary per
		* operation.
		* These messages may be used to provide user guidance multiple times per operation if
		* necessary.
		*
		* @param frame See the EnrollmentFrame enum.
		*/
		@@ -60,18 +60,18 @@ interface ISessionCallback {

		/**
		* This method must only be used to notify the framework during the following operations:
		* 1) ISession#enroll
		* 2) ISession#authenticate
		* 3) ISession#detectInteraction
		* 4) ISession#invalidateAuthenticatorId
		* 5) ISession#resetLockout
		* - ISession#enroll
		* - ISession#authenticate
		* - ISession#detectInteraction
		* - ISession#invalidateAuthenticatorId
		* - ISession#resetLockout
		*
		* These messages may be used to notify the framework or user that a non-recoverable error
		* has occurred. The operation is finished, and the HAL must proceed with the next operation
		* or return to the idling state.
		*
		* Note that cancellation (see common::ICancellationSignal) and preemption must be followed with
		* an Error::CANCELED message.
		* Note that cancellation (see common::ICancellationSignal) must be followed with an
		* Error::CANCELED message.
		*
		* @param error See the Error enum.
		* @param vendorCode Only valid if error == Error::VENDOR. The vendorCode must be used to index