Device Trust from Android Enterprise - Integration guide

Important: Access to the device trust signals in the AMAPI SDK is restricted to prevent unauthorized usage. For additional information see: Device Trust from Android Enterprise - Signals access.

This document should be your primary guide for usage of the AMAPI SDK for the purposes of receiving device trust signals.

The AMAPI SDK enables your application (which we may sometimes refer to as a "Companion" app) to access device trust signals from the ADP (Android Device Policy) app. Your app can then use these signals to compute the device's trust state and enact business logic as chosen.

Prerequisites

• Access to the device trust signals is restricted to prevent unauthorized usage. For information on how to apply, go to the device trust signals access page.
• Android Enterprise recommends integrating the Play Integrity suite of APIs into your client application and referring to the result prior to reading and relying on the device trust signals. Devices that fail Play Integrity API checks shouldn't be trusted, nor any signals derived from the device used to make trust posture determinations. You can refer to Play Integrity's documentation for more details.

Note: Device Trust from Android Enterprise requires Android 10 or later.

Integrate with the AMAPI SDK in your application

To access the device trust signals your application has to integrate with the AMAPI SDK. You can find more information about this library and how to add it to your application in the AMAPI SDK integration guide.

Note: This process requires version 1.3.0+ of the AMAPI SDK library. You can find the latest available release in the AMAPI SDK library's release notes.
We strongly recommend always using the latest version of the library to benefit from the available bug fixes and improvements.

Add required permissions

A few of the signals returned from the Device Trust from Android Enterprise API requires that the app declares the same permission that would be required to access this information in the first place, in particular:

Signal	Required permission
Network State	ACCESS_NETWORK_STATE
Screen lock complexity	REQUEST_PASSWORD_COMPLEXITY

If these permissions are not included in the app's AndroidManifest.xml, the Device Trust from Android Enterprise API will return PERMISSION_ISSUE in the metadata of the related signal:

internalDeviceSettings=DeviceSettings{
  screenLockComplexity=COMPLEXITY_UNSPECIFIED,
  internalScreenLockComplexityMetadata=Metadata{
    dataIssues=[
      DataIssue{
        issueType=PERMISSION_ISSUE,
        issueLevel=WARNING,
        issueDetails=IssueDetailsCase{none}
      }
    ]
  },

For additional details see the list of the available device trust signals.

Steps to access the device trust signals

Applications that want to access the device trust signals are required to verify that the client environment is up to date and update it if necessary.

The steps to access the device trust signals are:

• Verify the client environment
• Prepare the client environment
• Access device trust signals

Verify the client environment

Note: The API requires an up to date version of GMSCore and the ADP app on the device to work correctly. To check the current device stat, you can use EnvironmentClient's getEnvironment method to check if the ADP app is installed and up to date for the requested Role.

The following code example shows how to use getEnvironment to read the current state of the ADP app. Your application can then create a deviceClient to access the device trust signals if the environment is ready and up to date (see Access device trust signals).

Key Point: Calling getEnvironment or prepareEnvironment without setting a Role will result in an InvalidArgumentException.

Kotlin

import com.google.android.managementapi.common.model.Role
import com.google.android.managementapi.device.DeviceClient
import com.google.android.managementapi.device.DeviceClientFactory
import com.google.android.managementapi.device.model.GetDeviceRequest
import com.google.android.managementapi.environment.EnvironmentClient
import com.google.android.managementapi.environment.EnvironmentClientFactory
import com.google.android.managementapi.environment.model.Environment.AndroidDevicePolicyEnvironment.State.INSTALLED
import com.google.android.managementapi.environment.model.Environment.AndroidDevicePolicyEnvironment.State.NOT_INSTALLED
import com.google.android.managementapi.environment.model.Environment.AndroidDevicePolicyEnvironment.State.READY
import com.google.android.managementapi.environment.model.Environment.AndroidDevicePolicyEnvironment.Version.UP_TO_DATE
import com.google.android.managementapi.environment.model.GetEnvironmentRequest
import com.google.android.managementapi.environment.model.PrepareEnvironmentRequest

try {
    val context = applicationContext

    val roles = listOf(Role.builder().setRoleType(Role.RoleType.IDENTITY_PROVIDER).build())
    val request = GetEnvironmentRequest.builder().setRoles(roles).build()
    val environmentClient = EnvironmentClientFactory.create(context)
    val environmentResponse = environmentClient.getEnvironment(request)

    if (environmentResponse.hasAndroidDevicePolicyEnvironment()) {
        val adpEnvironment = environmentResponse.androidDevicePolicyEnvironment

        if (adpEnvironment.state == READY && adpEnvironment.version == UP_TO_DATE) {
            // AMAPI Environment State OK, Version OK.  Requesting Device signals..
            checkDevice(deviceClient = DeviceClientFactory.create(context))
        } else if (adpEnvironment.state == INSTALLED) {
            // prepareEnvironment should be called, calling
            // prepareEnvironment won't show the UI
            prepareEnvironment(context, environmentClient)
        } else if (adpEnvironment.state == NOT_INSTALLED) {
            // prepareEnvironment should be called, calling
            // prepareEnvironment will show the UI
            prepareEnvironment(context, environmentClient)
        }
    }
} catch (e: Exception) {
    Log.e(TAG, "Exception", e)
}

Java

import static com.google.android.managementapi.environment.model.Environment.AndroidDevicePolicyEnvironment.State.INSTALLED;
import static com.google.android.managementapi.environment.model.Environment.AndroidDevicePolicyEnvironment.State.NOT_INSTALLED;
import static com.google.android.managementapi.environment.model.Environment.AndroidDevicePolicyEnvironment.State.READY;
import static com.google.android.managementapi.environment.model.Environment.AndroidDevicePolicyEnvironment.Version.UP_TO_DATE;

import com.google.android.managementapi.common.model.Role;
import com.google.android.managementapi.device.DeviceClient;
import com.google.android.managementapi.device.DeviceClientFactory;
import com.google.android.managementapi.device.model.Device;
import com.google.android.managementapi.device.model.GetDeviceRequest;
import com.google.android.managementapi.environment.EnvironmentClient;
import com.google.android.managementapi.environment.EnvironmentClientFactory;
import com.google.android.managementapi.environment.model.Environment;
import com.google.android.managementapi.environment.model.Environment.AndroidDevicePolicyEnvironment;
import com.google.android.managementapi.environment.model.GetEnvironmentRequest;
import com.google.android.managementapi.environment.model.PrepareEnvironmentRequest;
import com.google.android.managementapi.environment.model.PrepareEnvironmentResponse;

try {
    Context context = getApplicationContext();

    ImmutableList roles = new ImmutableList.Builder()
            .add(Role.builder()
                    .setRoleType(Role.RoleType.IDENTITY_PROVIDER)
                    .build())
            .build();

    EnvironmentClient environmentClient = EnvironmentClientFactory.create(context);
    GetEnvironmentRequest request = GetEnvironmentRequest.builder()
            .setRoles(roles)
            .build();

    ListenableFuture getEnvironmentFuture = environmentClient.getEnvironmentAsync(request);
    Futures.addCallback(getEnvironmentFuture, new FutureCallback<>() {
        @Override
        public void onSuccess(Environment environment) {
            AndroidDevicePolicyEnvironment adpEnvironment = environment.getAndroidDevicePolicyEnvironment();

            AndroidDevicePolicyEnvironment.State state = adpEnvironment.getState();
            AndroidDevicePolicyEnvironment.Version version = adpEnvironment.getVersion();
            if (state == READY && version == UP_TO_DATE) {
                // AMAPI Environment State OK, Version OK.  Requesting Device signals..
                DeviceClient deviceClient = DeviceClientFactory.create(context);
                checkDevice(deviceClient);
            } else if (state == INSTALLED) {
                // prepareEnvironment should be called, calling
                // prepareEnvironment won't show the UI
                prepareEnvironment(context, environmentClient);
            } else if (state == NOT_INSTALLED) {
                // prepareEnvironment should be called, calling
                // prepareEnvironment will show the UI
                prepareEnvironment(context, environmentClient);
            }
        }

        @Override
        public void onFailure(Throwable t) {
            Log.d(TAG, t.toString());
        }
    }, MoreExecutors.directExecutor());
} catch (Exception e) {
    Log.d(TAG, e.toString());
}

If the ADP app is installed but not up to date, your application should call prepareEnvironment to silently update the ADP app without user intervention.

If the ADP app is not installed, your application can call prepareEnvironment to prompt the user to install the ADP app. See Prepare the client environment.

Prepare the client environment

Note: If the client environment on the device isn't ready, it is required to call prepareEnvironment to install or update the ADP app before accessing the device trust signals.

• If the ADP app is already installed, the API will silently update it with no user intervention.

• If the ADP app is not installed, the API will prompt the user to accept the installation of the ADP app.

It is possible to register a callback to monitor the user choice. See Track user interaction during the ADP app installation for additional details.

We recommend that the prepareEnvironment call is done from a foreground process, during the onboarding UX flow to avoid surprising the user with the Install Android Device Policy modal dialog. If calling from a foreground process is not possible, because this is a Web flow and the Android component has no UI, calling from background is permitted with the requirement that this happens during the onboarding UX flow.

Note: On managed devices it is recommended that the IT admin deploys the ADP app to the managed devices silently using the managed play. There are additional controls available with Managed Play that the IT admin may use:

• policy.productPolicy[].autoInstallPolicy - controls the priority and situation to install the app
• policy.productPolicy[].autoUpdateMode - controls the app update priority. The IT admin may set this to AUTO_UPDATE_HIGH_PRIORITY

Once the environment is correctly set up, it is possible to access the device trust Signals. See Access device trust signals.

Key Point: Calling getEnvironment or prepareEnvironment without setting a Role will result in an InvalidArgumentException.

Kotlin

try {
    val myNotificationReceiverService = ComponentName(
        context, MyNotificationReceiverService::class.java
    )

    val roles = listOf(Role.builder().setRoleType(Role.RoleType.IDENTITY_PROVIDER).build())
    val request = PrepareEnvironmentRequest.builder().setRoles(roles).build()

    val response =
        environmentClient.prepareEnvironment(request, myNotificationReceiverService)

    val environment = response.environment
    val adpEnvironment = environment.androidDevicePolicyEnvironment

    val state = adpEnvironment.state
    val version = adpEnvironment.version
    if (state == READY && version == UP_TO_DATE) {
        // Environment is prepared, access device posture signals using
        // DeviceClient.
        checkDevice(deviceClient = DeviceClientFactory.create(context))
    } else {
        // The prepareEnvironment call failed to prepare
        Log.w(
            TAG, "AMAPI environment was not ready: " + state + " - " + version
        )
    }

} catch (e: java.lang.Exception) {
    Log.d(TAG, e.toString())
}

Java

try {
    ComponentName myNotificationReceiverService = new ComponentName(
            context,
            MyNotificationReceiverService.class
    );

    ImmutableList roles = new ImmutableList.Builder()
            .add(Role.builder()
                    .setRoleType(Role.RoleType.IDENTITY_PROVIDER)
                    .build())
            .build();


    PrepareEnvironmentRequest request = PrepareEnvironmentRequest.builder()
            .setRoles(roles)
            .build();

    ListenableFuture environmentFuture =
            environmentClient.prepareEnvironmentAsync(
                    request,
                    myNotificationReceiverService
            );

    Futures.addCallback(environmentFuture, new FutureCallback<>() {
        @Override
        public void onSuccess(PrepareEnvironmentResponse response) {
            Environment environment = response.getEnvironment();
            AndroidDevicePolicyEnvironment adpEnvironment = environment.getAndroidDevicePolicyEnvironment();

            AndroidDevicePolicyEnvironment.State state = adpEnvironment.getState();
            AndroidDevicePolicyEnvironment.Version version = adpEnvironment.getVersion();
            if (state == READY && version == UP_TO_DATE) {
                // AMAPI Environment State OK, Version OK.  Requesting Device signals..
                DeviceClient deviceClient = DeviceClientFactory.create(context);
                checkDevice(deviceClient);
            } else {
                // The prepareEnvironment call failed to prepare
                Log.w(
                        TAG, "AMAPI environment was not ready: "
                        + adpEnvironment.getState() + " - " + adpEnvironment.getVersion()
                );
            }
        }

        @Override
        public void onFailure(@NonNull Throwable t) {
            // Handle the error
            Log.d(TAG, "AMAPI response did not contain an ADP environment");
        }
    }, MoreExecutors.directExecutor());
} catch (Exception e) {
    Log.d(TAG, e.toString());
}

Access device trust signals

Note: Accessing the device trust signals requires an up to date environment. Always check the environment as explained in the Verify the client environment section before trying to access the device posture information.

To Access the device trust signals you are interested in, you can use the deviceClient instance seen in the previous step to request the Device object.

Kotlin

try {
    kotlin.runCatching {
        deviceClient.getDeviceAwait(GetDeviceRequest.getDefaultInstance())
    }.onFailure { t ->
        Log.d(TAG, t.toString())
    }.onSuccess { device ->
        // Access device posture signals available in device
        val deviceString = device.toString()
        Log.d(TAG, deviceString)
    }
} catch (e: java.lang.Exception) {
    Log.d(TAG, e.toString())
}

Java

try {
    ListenableFuture deviceFuture =
            deviceClient.getDevice(GetDeviceRequest.getDefaultInstance());

    Futures.addCallback(deviceFuture, new FutureCallback() {
        @Override
        public void onSuccess(Device device) {
            // Access device posture signals available in device
            String deviceString = device.toString();
            Log.d(TAG, deviceString);
        }

        @Override
        public void onFailure(Throwable t) {
            Log.d(TAG, Log.d(TAG, t.toString());
        }
    }, MoreExecutors.directExecutor());
} catch (Exception e) {
    Log.d(TAG, e.toString());
}

Track user interaction during ADP app installation

If the device needs to install the ADP app during the prepareEnvironment your application can track the user interaction implementing a NotificationReceiverService to receive notifications overriding getPrepareEnvironmentListener:

Kotlin

import android.util.Log
import com.google.android.managementapi.environment.EnvironmentListener
import com.google.android.managementapi.environment.model.EnvironmentEvent.EventCase.Kind.ANDROID_DEVICE_POLICY_INSTALL_CONSENT_ACCEPTED
import com.google.android.managementapi.environment.model.EnvironmentEvent
import com.google.android.managementapi.notification.NotificationReceiverService

class MyNotificationReceiverService : NotificationReceiverService() {
    override fun getPrepareEnvironmentListener(): EnvironmentListener {
        return MyEnvironmentListener()
    }
}

class MyEnvironmentListener : EnvironmentListener {
    override fun onEnvironmentEvent(
        event: EnvironmentEvent
    ) {
        if (event.event.kind == ANDROID_DEVICE_POLICY_INSTALL_CONSENT_ACCEPTED) {
            Log.d(TAG, "User provided install consent")
        } else {
            Log.d(TAG, "User rejected install consent")
        }
    }

    companion object {
        private val TAG: String = MyEnvironmentListener::class.java.simpleName
    }
}

Java

import static com.google.android.managementapi.environment.model.EnvironmentEvent.EventCase.Kind.ANDROID_DEVICE_POLICY_INSTALL_CONSENT_ACCEPTED;

import android.util.Log;
import androidx.annotation.NonNull;
import com.google.android.managementapi.environment.EnvironmentListener;
import com.google.android.managementapi.environment.model.EnvironmentEvent;
import com.google.android.managementapi.notification.NotificationReceiverService;

class MyNotificationReceiverService extends NotificationReceiverService {
    @NonNull
    @Override
    protected EnvironmentListener getPrepareEnvironmentListener() {
        return new MyEnvironmentListener();
    }
}
class MyEnvironmentListener implements EnvironmentListener {
    final private String TAG = MyEnvironmentListener.class.getSimpleName();

    @Override
    public void onEnvironmentEvent(EnvironmentEvent event) {
        if (event.getEvent().getKind() == ANDROID_DEVICE_POLICY_INSTALL_CONSENT_ACCEPTED)
        {
            Log.d(TAG, "User provided install consent");
        } else {
            Log.d(TAG, "User rejected install consent");
        }
    }
}

Known issues

There are no known issues at the moment.