Add API for proxy configuration over VPN.

Test: runtest -x
frameworks/base/tests/net/java/com/android/server/ConnectivityServiceTest.java
&& atest HostsideVpnTests
Bug: 76001058
Change-Id: Id4dde4a4103fd93bfbbacc52d0e5ade56ae67a6a
Merged-In: Id4dde4a4103fd93bfbbacc52d0e5ade56ae67a6a

core/java/android/net/ProxyInfo.java

@@ -39,12 +39,12 @@ import java.util.Locale;
  */
 public class ProxyInfo implements Parcelable {
 
-    private String mHost;
+    private final String mHost;
-    private int mPort;
+    private final int mPort;
-    private String mExclusionList;
+    private final String mExclusionList;
-    private String[] mParsedExclusionList;
+    private final String[] mParsedExclusionList;
+    private final Uri mPacFileUrl;
 
-    private Uri mPacFileUrl;
     /**
      *@hide
      */
@@ -96,7 +96,8 @@ public class ProxyInfo implements Parcelable {
     public ProxyInfo(String host, int port, String exclList) {
         mHost = host;
         mPort = port;
-        setExclusionList(exclList);
+        mExclusionList = exclList;
+        mParsedExclusionList = parseExclusionList(mExclusionList);
         mPacFileUrl = Uri.EMPTY;
     }
 
@@ -107,7 +108,8 @@ public class ProxyInfo implements Parcelable {
     public ProxyInfo(Uri pacFileUrl) {
         mHost = LOCAL_HOST;
         mPort = LOCAL_PORT;
-        setExclusionList(LOCAL_EXCL_LIST);
+        mExclusionList = LOCAL_EXCL_LIST;
+        mParsedExclusionList = parseExclusionList(mExclusionList);
         if (pacFileUrl == null) {
             throw new NullPointerException();
         }
@@ -121,7 +123,8 @@ public class ProxyInfo implements Parcelable {
     public ProxyInfo(String pacFileUrl) {
         mHost = LOCAL_HOST;
         mPort = LOCAL_PORT;
-        setExclusionList(LOCAL_EXCL_LIST);
+        mExclusionList = LOCAL_EXCL_LIST;
+        mParsedExclusionList = parseExclusionList(mExclusionList);
         mPacFileUrl = Uri.parse(pacFileUrl);
     }
 
@@ -132,13 +135,22 @@ public class ProxyInfo implements Parcelable {
     public ProxyInfo(Uri pacFileUrl, int localProxyPort) {
         mHost = LOCAL_HOST;
         mPort = localProxyPort;
-        setExclusionList(LOCAL_EXCL_LIST);
+        mExclusionList = LOCAL_EXCL_LIST;
+        mParsedExclusionList = parseExclusionList(mExclusionList);
         if (pacFileUrl == null) {
             throw new NullPointerException();
         }
         mPacFileUrl = pacFileUrl;
     }
 
+    private static String[] parseExclusionList(String exclusionList) {
+        if (exclusionList == null) {
+            return new String[0];
+        } else {
+            return exclusionList.toLowerCase(Locale.ROOT).split(",");
+        }
+    }
+
     private ProxyInfo(String host, int port, String exclList, String[] parsedExclList) {
         mHost = host;
         mPort = port;
@@ -159,6 +171,10 @@ public class ProxyInfo implements Parcelable {
             mExclusionList = source.getExclusionListAsString();
             mParsedExclusionList = source.mParsedExclusionList;
         } else {
+            mHost = null;
+            mPort = 0;
+            mExclusionList = null;
+            mParsedExclusionList = null;
             mPacFileUrl = Uri.EMPTY;
         }
     }
@@ -214,16 +230,6 @@ public class ProxyInfo implements Parcelable {
         return mExclusionList;
     }
 
-    // comma separated
-    private void setExclusionList(String exclusionList) {
-        mExclusionList = exclusionList;
-        if (mExclusionList == null) {
-            mParsedExclusionList = new String[0];
-        } else {
-            mParsedExclusionList = exclusionList.toLowerCase(Locale.ROOT).split(",");
-        }
-    }
-
     /**
      * @hide
      */
@@ -352,8 +358,7 @@ public class ProxyInfo implements Parcelable {
                 }
                 String exclList = in.readString();
                 String[] parsedExclList = in.readStringArray();
-                ProxyInfo proxyProperties =
+                ProxyInfo proxyProperties = new ProxyInfo(host, port, exclList, parsedExclList);
-                        new ProxyInfo(host, port, exclList, parsedExclList);
                 return proxyProperties;
             }
 

services/core/java/com/android/server/ConnectivityService.java

@@ -506,7 +506,8 @@ public class ConnectivityService extends IConnectivityManager.Stub
 
     // A helper object to track the current default HTTP proxy. ConnectivityService needs to tell
     // the world when it changes.
-    private final ProxyTracker mProxyTracker;
+    @VisibleForTesting
+    protected final ProxyTracker mProxyTracker;
 
     final private SettingsObserver mSettingsObserver;
 
@@ -815,7 +816,7 @@ public class ConnectivityService extends IConnectivityManager.Stub
         mPolicyManagerInternal = checkNotNull(
                 LocalServices.getService(NetworkPolicyManagerInternal.class),
                 "missing NetworkPolicyManagerInternal");
-        mProxyTracker = new ProxyTracker(context, mHandler, EVENT_PROXY_HAS_CHANGED);
+        mProxyTracker = makeProxyTracker();
 
         mNetd = NetdService.getInstance();
         mKeyStore = KeyStore.getInstance();
@@ -981,6 +982,11 @@ public class ConnectivityService extends IConnectivityManager.Stub
                 deps);
     }
 
+    @VisibleForTesting
+    protected ProxyTracker makeProxyTracker() {
+        return new ProxyTracker(mContext, mHandler, EVENT_PROXY_HAS_CHANGED);
+    }
+
     private static NetworkCapabilities createDefaultNetworkCapabilitiesForUid(int uid) {
         final NetworkCapabilities netCap = new NetworkCapabilities();
         netCap.addCapability(NET_CAPABILITY_INTERNET);
@@ -3685,20 +3691,46 @@ public class ConnectivityService extends IConnectivityManager.Stub
         }
     }
 
+    /**
+     * Returns information about the proxy a certain network is using. If given a null network, it
+     * it will return the proxy for the bound network for the caller app or the default proxy if
+     * none.
+     *
+     * @param network the network we want to get the proxy information for.
+     * @return Proxy information if a network has a proxy configured, or otherwise null.
+     */
     @Override
     public ProxyInfo getProxyForNetwork(Network network) {
-        if (network == null) return mProxyTracker.getDefaultProxy();
         final ProxyInfo globalProxy = mProxyTracker.getGlobalProxy();
         if (globalProxy != null) return globalProxy;
-        if (!NetworkUtils.queryUserAccess(Binder.getCallingUid(), network.netId)) return null;
+        if (network == null) {
+            // Get the network associated with the calling UID.
+            final Network activeNetwork = getActiveNetworkForUidInternal(Binder.getCallingUid(),
+                    true);
+            if (activeNetwork == null) {
+                return null;
+            }
+            return getLinkPropertiesProxyInfo(activeNetwork);
+        } else if (queryUserAccess(Binder.getCallingUid(), network.netId)) {
             // Don't call getLinkProperties() as it requires ACCESS_NETWORK_STATE permission, which
             // caller may not have.
+            return getLinkPropertiesProxyInfo(network);
+        }
+        // No proxy info available if the calling UID does not have network access.
+        return null;
+    }
+
+    @VisibleForTesting
+    protected boolean queryUserAccess(int uid, int netId) {
+        return NetworkUtils.queryUserAccess(uid, netId);
+    }
+
+    private ProxyInfo getLinkPropertiesProxyInfo(Network network) {
         final NetworkAgentInfo nai = getNetworkAgentInfoForNetwork(network);
         if (nai == null) return null;
         synchronized (nai) {
-            final ProxyInfo proxyInfo = nai.linkProperties.getHttpProxy();
+            final ProxyInfo linkHttpProxy = nai.linkProperties.getHttpProxy();
-            if (proxyInfo == null) return null;
+            return linkHttpProxy == null ? null : new ProxyInfo(linkHttpProxy);
-            return new ProxyInfo(proxyInfo);
         }
     }
 
@@ -3722,11 +3754,10 @@ public class ConnectivityService extends IConnectivityManager.Stub
         mProxyTracker.setDefaultProxy(proxy);
     }
 
-    // If the proxy has changed from oldLp to newLp, resend proxy broadcast with default proxy.
+    // If the proxy has changed from oldLp to newLp, resend proxy broadcast. This method gets called
-    // This method gets called when any network changes proxy, but the broadcast only ever contains
+    // when any network changes proxy.
-    // the default proxy (even if it hasn't changed).
+    // TODO: Remove usage of broadcast extras as they are deprecated and not applicable in a
-    // TODO: Deprecate the broadcast extras as they aren't necessarily applicable in a multi-network
+    // multi-network world where an app might be bound to a non-default network.
-    // world where an app might be bound to a non-default network.
     private void updateProxy(LinkProperties newLp, LinkProperties oldLp) {
         ProxyInfo newProxyInfo = newLp == null ? null : newLp.getHttpProxy();
         ProxyInfo oldProxyInfo = oldLp == null ? null : oldLp.getHttpProxy();
@@ -5893,12 +5924,6 @@ public class ConnectivityService extends IConnectivityManager.Stub
             }
             scheduleUnvalidatedPrompt(networkAgent);
 
-            if (networkAgent.isVPN()) {
-                // Temporarily disable the default proxy (not global).
-                mProxyTracker.setDefaultProxyEnabled(false);
-                // TODO: support proxy per network.
-            }
-
             // Whether a particular NetworkRequest listen should cause signal strength thresholds to
             // be communicated to a particular NetworkAgent depends only on the network's immutable,
             // capabilities, so it only needs to be done once on initial connect, not every time the
@@ -5917,10 +5942,16 @@ public class ConnectivityService extends IConnectivityManager.Stub
         } else if (state == NetworkInfo.State.DISCONNECTED) {
             networkAgent.asyncChannel.disconnect();
             if (networkAgent.isVPN()) {
-                mProxyTracker.setDefaultProxyEnabled(true);
                 updateUids(networkAgent, networkAgent.networkCapabilities, null);
             }
             disconnectAndDestroyNetwork(networkAgent);
+            if (networkAgent.isVPN()) {
+                // As the active or bound network changes for apps, broadcast the default proxy, as
+                // apps may need to update their proxy data. This is called after disconnecting from
+                // VPN to make sure we do not broadcast the old proxy data.
+                // TODO(b/122649188): send the broadcast only to VPN users.
+                mProxyTracker.sendProxyBroadcast();
+            }
         } else if ((oldInfo != null && oldInfo.getState() == NetworkInfo.State.SUSPENDED) ||
                 state == NetworkInfo.State.SUSPENDED) {
             // going into or coming out of SUSPEND: re-score and notify

services/core/java/com/android/server/connectivity/ProxyTracker.java

@@ -309,22 +309,4 @@ public class ProxyTracker {
             }
         }
     }
-
-    /**
-     * Enable or disable the default proxy.
-     *
-     * This sets the flag for enabling/disabling the default proxy and sends the broadcast
-     * if applicable.
-     * @param enabled whether the default proxy should be enabled.
-     */
-    public void setDefaultProxyEnabled(final boolean enabled) {
-        synchronized (mProxyLock) {
-            if (mDefaultProxyEnabled != enabled) {
-                mDefaultProxyEnabled = enabled;
-                if (mGlobalProxy == null && mDefaultProxy != null) {
-                    sendProxyBroadcast();
-                }
-            }
-        }
-    }
 }

tests/net/java/com/android/server/ConnectivityServiceTest.java

@@ -121,6 +121,7 @@ import android.net.NetworkRequest;
 import android.net.NetworkSpecifier;
 import android.net.NetworkStack;
 import android.net.NetworkUtils;
+import android.net.ProxyInfo;
 import android.net.RouteInfo;
 import android.net.UidRange;
 import android.net.metrics.IpConnectivityLog;
@@ -158,6 +159,7 @@ import com.android.server.connectivity.DefaultNetworkMetrics;
 import com.android.server.connectivity.IpConnectivityMetrics;
 import com.android.server.connectivity.MockableSystemProperties;
 import com.android.server.connectivity.Nat464Xlat;
+import com.android.server.connectivity.ProxyTracker;
 import com.android.server.connectivity.Tethering;
 import com.android.server.connectivity.Vpn;
 import com.android.server.net.NetworkPinner;
@@ -1001,6 +1003,11 @@ public class ConnectivityServiceTest {
             return mock(Tethering.class);
         }
 
+        @Override
+        protected ProxyTracker makeProxyTracker() {
+            return mock(ProxyTracker.class);
+        }
+
         @Override
         protected int reserveNetId() {
             while (true) {
@@ -1023,6 +1030,11 @@ public class ConnectivityServiceTest {
             }
         }
 
+        @Override
+        protected boolean queryUserAccess(int uid, int netId) {
+            return true;
+        }
+
         public Nat464Xlat getNat464Xlat(MockNetworkAgent mna) {
             return getNetworkAgentInfoForNetwork(mna.getNetwork()).clatd;
         }
@@ -4914,4 +4926,84 @@ public class ConnectivityServiceTest {
         mCellNetworkAgent.sendLinkProperties(lp);
         verifyTcpBufferSizeChange(TEST_TCP_BUFFER_SIZES);
     }
+
+    @Test
+    public void testGetGlobalProxyForNetwork() {
+        final ProxyInfo testProxyInfo = ProxyInfo.buildDirectProxy("test", 8888);
+        mWiFiNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
+        final Network wifiNetwork = mWiFiNetworkAgent.getNetwork();
+        when(mService.mProxyTracker.getGlobalProxy()).thenReturn(testProxyInfo);
+        assertEquals(testProxyInfo, mService.getProxyForNetwork(wifiNetwork));
+    }
+
+    @Test
+    public void testGetProxyForActiveNetwork() {
+        final ProxyInfo testProxyInfo = ProxyInfo.buildDirectProxy("test", 8888);
+        mWiFiNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
+        mWiFiNetworkAgent.connect(true);
+        waitForIdle();
+        assertNull(mService.getProxyForNetwork(null));
+
+        final LinkProperties testLinkProperties = new LinkProperties();
+        testLinkProperties.setHttpProxy(testProxyInfo);
+
+        mWiFiNetworkAgent.sendLinkProperties(testLinkProperties);
+        waitForIdle();
+
+        assertEquals(testProxyInfo, mService.getProxyForNetwork(null));
+    }
+
+    @Test
+    public void testGetProxyForVPN() {
+        final ProxyInfo testProxyInfo = ProxyInfo.buildDirectProxy("test", 8888);
+
+        // Set up a WiFi network with no proxy
+        mWiFiNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
+        mWiFiNetworkAgent.connect(true);
+        waitForIdle();
+        assertNull(mService.getProxyForNetwork(null));
+
+        // Set up a VPN network with a proxy
+        final int uid = Process.myUid();
+        final MockNetworkAgent vpnNetworkAgent = new MockNetworkAgent(TRANSPORT_VPN);
+        final ArraySet<UidRange> ranges = new ArraySet<>();
+        ranges.add(new UidRange(uid, uid));
+        mMockVpn.setUids(ranges);
+        LinkProperties testLinkProperties = new LinkProperties();
+        testLinkProperties.setHttpProxy(testProxyInfo);
+        vpnNetworkAgent.sendLinkProperties(testLinkProperties);
+        waitForIdle();
+
+        // Connect to VPN with proxy
+        mMockVpn.setNetworkAgent(vpnNetworkAgent);
+        vpnNetworkAgent.connect(true);
+        mMockVpn.connect();
+        waitForIdle();
+
+        // Test that the VPN network returns a proxy, and the WiFi does not.
+        assertEquals(testProxyInfo, mService.getProxyForNetwork(vpnNetworkAgent.getNetwork()));
+        assertEquals(testProxyInfo, mService.getProxyForNetwork(null));
+        assertNull(mService.getProxyForNetwork(mWiFiNetworkAgent.getNetwork()));
+
+        // Test that the VPN network returns no proxy when it is set to null.
+        testLinkProperties.setHttpProxy(null);
+        vpnNetworkAgent.sendLinkProperties(testLinkProperties);
+        waitForIdle();
+        assertNull(mService.getProxyForNetwork(vpnNetworkAgent.getNetwork()));
+        assertNull(mService.getProxyForNetwork(null));
+
+        // Set WiFi proxy and check that the vpn proxy is still null.
+        testLinkProperties.setHttpProxy(testProxyInfo);
+        mWiFiNetworkAgent.sendLinkProperties(testLinkProperties);
+        waitForIdle();
+        assertNull(mService.getProxyForNetwork(null));
+
+        // Disconnect from VPN and check that the active network, which is now the WiFi, has the
+        // correct proxy setting.
+        vpnNetworkAgent.disconnect();
+        waitForIdle();
+        assertEquals(mWiFiNetworkAgent.getNetwork(), mCm.getActiveNetwork());
+        assertEquals(testProxyInfo, mService.getProxyForNetwork(mWiFiNetworkAgent.getNetwork()));
+        assertEquals(testProxyInfo, mService.getProxyForNetwork(null));
+    }
 }