android/ui: add mdm hooks (#364)

Updates tailscale/corp#19743

Adds the hooks for the various MDM settings applicable to Android with
the exception of the keyExpirationNotice which we'll handle separately.

Signed-off-by: Jonathan Nobels <jonathan@tailscale.com>

android/src/main/java/com/tailscale/ipn/mdm/MDMSettings.kt

@@ -18,41 +18,71 @@ object MDMSettings {
 
   val forceEnabled = BooleanMDMSetting("ForceEnabled", "Force Enabled Connection Toggle")
 
+  // Handled on the backed
   val exitNodeID = StringMDMSetting("ExitNodeID", "Forced Exit Node: Stable ID")
+
+  // (jonathan) TODO: Unused but required. There is some funky go string duration parsing required
+  // here.
   val keyExpirationNotice = StringMDMSetting("KeyExpirationNotice", "Key Expiration Notice Period")
+
   val loginURL = StringMDMSetting("LoginURL", "Custom control server URL")
+
   val managedByCaption = StringMDMSetting("ManagedByCaption", "Managed By - Caption")
+
   val managedByOrganizationName =
       StringMDMSetting("ManagedByOrganizationName", "Managed By - Organization Name")
+
   val managedByURL = StringMDMSetting("ManagedByURL", "Managed By - Support URL")
+
+  // Handled on the backend
   val tailnet = StringMDMSetting("Tailnet", "Recommended/Required Tailnet Name")
 
   val hiddenNetworkDevices =
       StringArrayListMDMSetting("HiddenNetworkDevices", "Hidden Network Device Categories")
 
+  // Unused on Android
   val allowIncomingConnections =
       AlwaysNeverUserDecidesMDMSetting("AllowIncomingConnections", "Allow Incoming Connections")
+
+  // Unused on Android
   val detectThirdPartyAppConflicts =
       AlwaysNeverUserDecidesMDMSetting(
           "DetectThirdPartyAppConflicts", "Detect potentially problematic third-party apps")
+
   val exitNodeAllowLANAccess =
       AlwaysNeverUserDecidesMDMSetting(
           "ExitNodeAllowLANAccess", "Allow LAN Access when using an exit node")
+
+  // Handled on the backend
   val postureChecking =
       AlwaysNeverUserDecidesMDMSetting("PostureChecking", "Enable Posture Checking")
+
   val useTailscaleDNSSettings =
       AlwaysNeverUserDecidesMDMSetting("UseTailscaleDNSSettings", "Use Tailscale DNS Settings")
+
+  // Unused on Android
   val useTailscaleSubnets =
       AlwaysNeverUserDecidesMDMSetting("UseTailscaleSubnets", "Use Tailscale Subnets")
 
   val exitNodesPicker = ShowHideMDMSetting("ExitNodesPicker", "Exit Nodes Picker")
+
   val manageTailnetLock = ShowHideMDMSetting("ManageTailnetLock", "“Manage Tailnet lock” menu item")
+
+  // Unused on Android
   val resetToDefaults = ShowHideMDMSetting("ResetToDefaults", "“Reset to Defaults” menu item")
+
   val runExitNode = ShowHideMDMSetting("RunExitNode", "Run as Exit Node")
+
+  // Unused on Android
   val testMenu = ShowHideMDMSetting("TestMenu", "Show Debug Menu")
+
+  // Unused on Android
   val updateMenu = ShowHideMDMSetting("UpdateMenu", "“Update Available” menu item")
+
+  // (jonathan) TODO: Use this when suggested exit nodes are implemented
   val allowedSuggestedExitNodes =
       StringArrayListMDMSetting("AllowedSuggestedExitNodes", "Allowed Suggested Exit Nodes")
+
   val allSettings by lazy {
     MDMSettings::class
         .declaredMemberProperties

android/src/main/java/com/tailscale/ipn/mdm/MDMSettingsDefinitions.kt

@@ -81,7 +81,12 @@ class ShowHideMDMSetting(key: String, localizedTitle: String) :
 enum class AlwaysNeverUserDecides(val value: String) {
   Always("always"),
   Never("never"),
-  UserDecides("user-decides")
+  UserDecides("user-decides");
+
+  val hiddenFromUser: Boolean
+    get() {
+      return this != UserDecides
+    }
 }
 
 enum class ShowHide(val value: String) {

android/src/main/java/com/tailscale/ipn/ui/util/PeerHelper.kt

@@ -3,6 +3,7 @@
 
 package com.tailscale.ipn.ui.util
 
+import com.tailscale.ipn.mdm.MDMSettings
 import com.tailscale.ipn.ui.model.Netmap
 import com.tailscale.ipn.ui.model.Tailcfg
 import com.tailscale.ipn.ui.model.UserID
@@ -19,21 +20,41 @@ class PeerCategorizer {
     val selfNode = netmap.SelfNode
     var grouped = mutableMapOf<UserID, MutableList<Tailcfg.Node>>()
 
+    val mdm = MDMSettings.hiddenNetworkDevices.flow.value
+    val hideMyDevices = mdm?.contains("current-user") ?: false
+    val hideOtherDevices = mdm?.contains("other-users") ?: false
+    val hideTaggedDevices = mdm?.contains("tagged-devices") ?: false
+
+    val me = netmap.currentUserProfile()
+
     for (peer in (peers + selfNode)) {
-      // (jonathan) TODO: MDM -> There are a number of MDM settings to hide devices from the user
-      // (jonathan) TODO: MDM -> currentUser, otherUsers, taggedDevices
+
       val userId = peer.User
+      val profile = netmap.userProfile(userId)
+
+      // Mullvad nodes should not be shown in the peer list
+      if (peer.isMullvadNode) {
+        continue
+      }
+
+      // Hide devices based on MDM settings
+      if (hideMyDevices && userId == me?.ID) {
+        continue
+      }
+
+      if (hideOtherDevices && userId != me?.ID) {
+        continue
+      }
+
+      if (hideTaggedDevices && (profile?.isTaggedDevice() == true)) {
+        continue
+      }
 
-      // Mullvad based nodes should not be shown in the peer list
-      if (!peer.isMullvadNode) {
       if (!grouped.containsKey(userId)) {
         grouped[userId] = mutableListOf()
       }
       grouped[userId]?.add(peer)
     }
-    }
-
-    val me = netmap.currentUserProfile()
 
     peerSets =
         grouped

android/src/main/java/com/tailscale/ipn/ui/view/DNSSettingsView.kt

@@ -21,6 +21,7 @@ import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.tailscale.ipn.R
+import com.tailscale.ipn.mdm.MDMSettings
 import com.tailscale.ipn.ui.model.DnsType
 import com.tailscale.ipn.ui.notifier.Notifier
 import com.tailscale.ipn.ui.util.ClipboardValueView
@@ -48,6 +49,7 @@ fun DNSSettingsView(
         entry.value?.let { resolvers -> ViewableRoute(name = entry.key, resolvers) } ?: run { null }
       } ?: emptyList()
   val useCorpDNS = Notifier.prefs.collectAsState().value?.CorpDNS == true
+  val dnsSettingsMDMDisposition = MDMSettings.useTailscaleDNSSettings.flow.collectAsState().value
 
   Scaffold(topBar = { Header(R.string.dns_settings, onBack = backToSettings) }) { innerPadding ->
     LoadingIndicator.Wrap {
@@ -66,6 +68,7 @@ fun DNSSettingsView(
               },
               supportingContent = { Text(stringResource(state.caption)) })
 
+          if (!dnsSettingsMDMDisposition.hiddenFromUser) {
             Lists.ItemDivider()
             Setting.Switch(
                 R.string.use_ts_dns,
@@ -75,6 +78,7 @@ fun DNSSettingsView(
                   model.toggleCorpDNS { LoadingIndicator.stop() }
                 })
           }
+        }
 
         if (resolvers.isNotEmpty()) {
           item("resolversHeader") { Lists.SectionDivider(stringResource(R.string.resolvers)) }

android/src/main/java/com/tailscale/ipn/ui/view/ExitNodePicker.kt

@@ -21,6 +21,8 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.tailscale.ipn.R
+import com.tailscale.ipn.mdm.MDMSettings
+import com.tailscale.ipn.mdm.ShowHide
 import com.tailscale.ipn.ui.notifier.Notifier
 import com.tailscale.ipn.ui.theme.disabledListItem
 import com.tailscale.ipn.ui.theme.listItem
@@ -45,6 +47,9 @@ fun ExitNodePicker(
       val mullvadExitNodeCount = model.mullvadExitNodeCount.collectAsState().value
       val anyActive = model.anyActive.collectAsState()
       val allowLANAccess = Notifier.prefs.collectAsState().value?.ExitNodeAllowLANAccess == true
+      val showRunAsExitNode = MDMSettings.runExitNode.flow.collectAsState().value
+      val allowLanAccessMDMDisposition =
+          MDMSettings.exitNodeAllowLANAccess.flow.collectAsState().value
 
       LazyColumn(modifier = Modifier.padding(innerPadding)) {
         item(key = "header") {
@@ -55,9 +60,12 @@ fun ExitNodePicker(
                   online = true,
                   selected = !anyActive.value,
               ))
+
+          if (showRunAsExitNode == ShowHide.Show) {
             Lists.ItemDivider()
             RunAsExitNodeItem(nav = nav, viewModel = model)
           }
+        }
 
         item(key = "divider1") { Lists.SectionDivider() }
 
@@ -71,7 +79,7 @@ fun ExitNodePicker(
           }
         }
 
-        // TODO: make sure this actually works, and if not, leave it out for now
+        if (!allowLanAccessMDMDisposition.hiddenFromUser) {
           item(key = "allowLANAccess") {
             Lists.SectionDivider()
 
@@ -84,6 +92,7 @@ fun ExitNodePicker(
       }
     }
   }
+}
 
 @Composable
 fun ExitNodeItem(

android/src/main/java/com/tailscale/ipn/ui/view/MainView.kt

@@ -64,6 +64,8 @@ import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.google.accompanist.permissions.ExperimentalPermissionsApi
 import com.tailscale.ipn.R
+import com.tailscale.ipn.mdm.MDMSettings
+import com.tailscale.ipn.mdm.ShowHide
 import com.tailscale.ipn.ui.model.Ipn
 import com.tailscale.ipn.ui.model.IpnLocal
 import com.tailscale.ipn.ui.model.Netmap
@@ -113,11 +115,20 @@ fun MainView(
             val stateVal = viewModel.stateRes.collectAsState(initial = R.string.placeholder).value
             val stateStr = stringResource(id = stateVal)
             val netmap = viewModel.netmap.collectAsState(initial = null).value
+            val showExitNodePicker = MDMSettings.exitNodesPicker.flow.collectAsState().value
+            val allowToggle = MDMSettings.forceEnabled.flow.collectAsState().value
 
             ListItem(
                 colors = MaterialTheme.colorScheme.surfaceContainerListItem,
                 leadingContent = {
-                  TintedSwitch(onCheckedChange = { viewModel.toggleVpn() }, checked = isOn.value)
+                  TintedSwitch(
+                      onCheckedChange = {
+                        if (allowToggle) {
+                          viewModel.toggleVpn()
+                        }
+                      },
+                      enabled = !allowToggle,
+                      checked = isOn.value)
                 },
                 headlineContent = {
                   user?.NetworkProfile?.DomainName?.let { domain ->
@@ -157,7 +168,10 @@ fun MainView(
 
                 ExpiryNotificationIfNecessary(netmap = netmap, action = { viewModel.login() })
 
-                ExitNodeStatus(navAction = navigation.onNavigateToExitNodes, viewModel = viewModel)
+                if (showExitNodePicker == ShowHide.Show) {
+                  ExitNodeStatus(
+                      navAction = navigation.onNavigateToExitNodes, viewModel = viewModel)
+                }
 
                 PeerList(
                     viewModel = viewModel,
@@ -263,7 +277,10 @@ fun ExitNodeStatus(navAction: () -> Unit, viewModel: MainViewModel) {
 @Composable
 fun SettingsButton(action: () -> Unit) {
   IconButton(modifier = Modifier.size(24.dp), onClick = { action() }) {
-    Icon(Icons.Outlined.Settings, contentDescription = "Open settings", tint = MaterialTheme.colorScheme.onSurfaceVariant)
+    Icon(
+        Icons.Outlined.Settings,
+        contentDescription = "Open settings",
+        tint = MaterialTheme.colorScheme.onSurfaceVariant)
   }
 }
 

android/src/main/java/com/tailscale/ipn/ui/view/SettingsView.kt

@@ -26,6 +26,8 @@ import androidx.compose.ui.tooling.preview.Preview
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.tailscale.ipn.BuildConfig
 import com.tailscale.ipn.R
+import com.tailscale.ipn.mdm.MDMSettings
+import com.tailscale.ipn.mdm.ShowHide
 import com.tailscale.ipn.ui.Links
 import com.tailscale.ipn.ui.theme.link
 import com.tailscale.ipn.ui.theme.listItem
@@ -43,6 +45,8 @@ fun SettingsView(settingsNav: SettingsNav, viewModel: SettingsViewModel = viewMo
   val tailnetLockEnabled = viewModel.tailNetLockEnabled.collectAsState().value
   val corpDNSEnabled = viewModel.corpDNSEnabled.collectAsState().value
 
+  val showTailnetLock = MDMSettings.manageTailnetLock.flow.collectAsState().value
+
   Scaffold(
       topBar = {
         Header(titleRes = R.string.settings_title, onBack = settingsNav.onNavigateBackHome)
@@ -68,6 +72,7 @@ fun SettingsView(settingsNav: SettingsNav, viewModel: SettingsViewModel = viewMo
                   },
               onClick = settingsNav.onNavigateToDNSSettings)
 
+          if (showTailnetLock == ShowHide.Show) {
             Lists.ItemDivider()
             Setting.Text(
                 R.string.tailnet_lock,
@@ -76,6 +81,7 @@ fun SettingsView(settingsNav: SettingsNav, viewModel: SettingsViewModel = viewMo
                       stringResource(if (it) R.string.enabled else R.string.disabled)
                     },
                 onClick = settingsNav.onNavigateToTailnetLock)
+          }
 
           Lists.ItemDivider()
           Setting.Text(R.string.permissions, onClick = settingsNav.onNavigateToPermissions)

android/src/main/java/com/tailscale/ipn/ui/viewModel/IpnViewModel.kt

@@ -9,6 +9,7 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.tailscale.ipn.App
 import com.tailscale.ipn.IPNReceiver
+import com.tailscale.ipn.mdm.MDMSettings
 import com.tailscale.ipn.ui.localapi.Client
 import com.tailscale.ipn.ui.model.Ipn
 import com.tailscale.ipn.ui.model.IpnLocal
@@ -86,6 +87,12 @@ open class IpnViewModel : ViewModel() {
 
   fun login(options: Ipn.Options = Ipn.Options(), completionHandler: (Result<Unit>) -> Unit = {}) {
 
+    MDMSettings.loginURL.flow.value?.let {
+      Log.d(TAG, "Using MDM derived control URL: $it")
+      loginWithCustomControlURL(it, completionHandler)
+      return
+    }
+
     val loginAction = {
       Client(viewModelScope).startLoginInteractive { result ->
         result