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/**
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server.fingerprint;
import android.hardware.biometrics.fingerprint.V2_1.IBiometricsFingerprint;
import com.android.internal.logging.MetricsLogger;
import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
import android.content.Context;
import android.hardware.fingerprint.Fingerprint;
import android.hardware.fingerprint.FingerprintManager;
import android.hardware.fingerprint.IFingerprintServiceReceiver;
import android.os.IBinder;
import android.os.RemoteException;
import android.util.Slog;
/**
* A class to keep track of the authentication state for a given client.
*/
public abstract class AuthenticationClient extends ClientMonitor {
private long mOpId;
public abstract int handleFailedAttempt();
public abstract void resetFailedAttempts();
public static final int LOCKOUT_NONE = 0;
public static final int LOCKOUT_TIMED = 1;
public static final int LOCKOUT_PERMANENT = 2;
public AuthenticationClient(Context context, long halDeviceId, IBinder token,
IFingerprintServiceReceiver receiver, int targetUserId, int groupId, long opId,
boolean restricted, String owner) {
super(context, halDeviceId, token, receiver, targetUserId, groupId, restricted, owner);
mOpId = opId;
}
@Override
public boolean onAuthenticated(int fingerId, int groupId) {
boolean result = false;
boolean authenticated = fingerId != 0;
IFingerprintServiceReceiver receiver = getReceiver();
if (receiver != null) {
try {
MetricsLogger.action(getContext(), MetricsEvent.ACTION_FINGERPRINT_AUTH,
authenticated);
if (!authenticated) {
receiver.onAuthenticationFailed(getHalDeviceId());
} else {
if (DEBUG) {
Slog.v(TAG, "onAuthenticated(owner=" + getOwnerString()
+ ", id=" + fingerId + ", gp=" + groupId + ")");
}
Fingerprint fp = !getIsRestricted()
? new Fingerprint("" /* TODO */, groupId, fingerId, getHalDeviceId())
: null;
receiver.onAuthenticationSucceeded(getHalDeviceId(), fp, getTargetUserId());
}
} catch (RemoteException e) {
Slog.w(TAG, "Failed to notify Authenticated:", e);
result = true; // client failed
}
} else {
result = true; // client not listening
}
if (!authenticated) {
if (receiver != null) {
vibrateError();
}
// allow system-defined limit of number of attempts before giving up
int lockoutMode = handleFailedAttempt();
if (lockoutMode != LOCKOUT_NONE) {
try {
Slog.w(TAG, "Forcing lockout (fp driver code should do this!), mode(" +
lockoutMode + ")");
stop(false);
int errorCode = lockoutMode == LOCKOUT_TIMED ?
FingerprintManager.FINGERPRINT_ERROR_LOCKOUT :
FingerprintManager.FINGERPRINT_ERROR_LOCKOUT_PERMANENT;
receiver.onError(getHalDeviceId(), errorCode, 0 /* vendorCode */);
} catch (RemoteException e) {
Slog.w(TAG, "Failed to notify lockout:", e);
}
}
result |= lockoutMode != LOCKOUT_NONE; // in a lockout mode
} else {
if (receiver != null) {
vibrateSuccess();
}
result |= true; // we have a valid fingerprint, done
resetFailedAttempts();
}
return result;
}
/**
* Start authentication
*/
@Override
public int start() {
IBiometricsFingerprint daemon = getFingerprintDaemon();
if (daemon == null) {
Slog.w(TAG, "start authentication: no fingerprint HAL!");
return ERROR_ESRCH;
}
try {
final int result = daemon.authenticate(mOpId, getGroupId());
if (result != 0) {
Slog.w(TAG, "startAuthentication failed, result=" + result);
MetricsLogger.histogram(getContext(), "fingeprintd_auth_start_error", result);
onError(FingerprintManager.FINGERPRINT_ERROR_HW_UNAVAILABLE, 0 /* vendorCode */);
return result;
}
if (DEBUG) Slog.w(TAG, "client " + getOwnerString() + " is authenticating...");
} catch (RemoteException e) {
Slog.e(TAG, "startAuthentication failed", e);
return ERROR_ESRCH;
}
return 0; // success
}
@Override
public int stop(boolean initiatedByClient) {
if (mAlreadyCancelled) {
Slog.w(TAG, "stopAuthentication: already cancelled!");
return 0;
}
IBiometricsFingerprint daemon = getFingerprintDaemon();
if (daemon == null) {
Slog.w(TAG, "stopAuthentication: no fingerprint HAL!");
return ERROR_ESRCH;
}
try {
final int result = daemon.cancel();
if (result != 0) {
Slog.w(TAG, "stopAuthentication failed, result=" + result);
return result;
}
if (DEBUG) Slog.w(TAG, "client " + getOwnerString() + " is no longer authenticating");
} catch (RemoteException e) {
Slog.e(TAG, "stopAuthentication failed", e);
return ERROR_ESRCH;
}
mAlreadyCancelled = true;
return 0; // success
}
@Override
public boolean onEnrollResult(int fingerId, int groupId, int remaining) {
if (DEBUG) Slog.w(TAG, "onEnrollResult() called for authenticate!");
return true; // Invalid for Authenticate
}
@Override
public boolean onRemoved(int fingerId, int groupId, int remaining) {
if (DEBUG) Slog.w(TAG, "onRemoved() called for authenticate!");
return true; // Invalid for Authenticate
}
@Override
public boolean onEnumerationResult(int fingerId, int groupId, int remaining) {
if (DEBUG) Slog.w(TAG, "onEnumerationResult() called for authenticate!");
return true; // Invalid for Authenticate
}
}
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