Merge "Fix NOT_RESTRICTED network capability and enforce it." into mnc-dev

7 files changed, 120 insertions, 46 deletions

diff --git a/core/java/android/net/ConnectivityManager.java b/core/java/android/net/ConnectivityManager.java
index abed1f0..605acb0 100644
--- a/core/java/android/net/ConnectivityManager.java
+++ b/core/java/android/net/ConnectivityManager.java
@@ -964,41 +964,6 @@ public class ConnectivityManager {
         return 1;
     }
 
-    /**
-     * Removes the NET_CAPABILITY_NOT_RESTRICTED capability from the given
-     * NetworkCapabilities object if all the capabilities it provides are
-     * typically provided by restricted networks.
-     *
-     * TODO: consider:
-     * - Moving to NetworkCapabilities
-     * - Renaming it to guessRestrictedCapability and make it set the
-     *   restricted capability bit in addition to clearing it.
-     * @hide
-     */
-    public static void maybeMarkCapabilitiesRestricted(NetworkCapabilities nc) {
-        for (int capability : nc.getCapabilities()) {
-            switch (capability) {
-                case NetworkCapabilities.NET_CAPABILITY_CBS:
-                case NetworkCapabilities.NET_CAPABILITY_DUN:
-                case NetworkCapabilities.NET_CAPABILITY_EIMS:
-                case NetworkCapabilities.NET_CAPABILITY_FOTA:
-                case NetworkCapabilities.NET_CAPABILITY_IA:
-                case NetworkCapabilities.NET_CAPABILITY_IMS:
-                case NetworkCapabilities.NET_CAPABILITY_RCS:
-                case NetworkCapabilities.NET_CAPABILITY_XCAP:
-                case NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED: //there by default
-                    continue;
-                default:
-                    // At least one capability usually provided by unrestricted
-                    // networks. Conclude that this network is unrestricted.
-                    return;
-            }
-        }
-        // All the capabilities are typically provided by restricted networks.
-        // Conclude that this network is restricted.
-        nc.removeCapability(NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED);
-    }
-
     private NetworkCapabilities networkCapabilitiesForFeature(int networkType, String feature) {
         if (networkType == TYPE_MOBILE) {
             int cap = -1;
@@ -1021,14 +986,14 @@ public class ConnectivityManager {
             }
             NetworkCapabilities netCap = new NetworkCapabilities();
             netCap.addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR).addCapability(cap);
-            maybeMarkCapabilitiesRestricted(netCap);
+            netCap.maybeMarkCapabilitiesRestricted();
             return netCap;
         } else if (networkType == TYPE_WIFI) {
             if ("p2p".equals(feature)) {
                 NetworkCapabilities netCap = new NetworkCapabilities();
                 netCap.addTransportType(NetworkCapabilities.TRANSPORT_WIFI);
                 netCap.addCapability(NetworkCapabilities.NET_CAPABILITY_WIFI_P2P);
-                maybeMarkCapabilitiesRestricted(netCap);
+                netCap.maybeMarkCapabilitiesRestricted();
                 return netCap;
             }
         }
diff --git a/core/java/android/net/NetworkCapabilities.java b/core/java/android/net/NetworkCapabilities.java
index 651fb35..29b063a 100644
--- a/core/java/android/net/NetworkCapabilities.java
+++ b/core/java/android/net/NetworkCapabilities.java
@@ -38,10 +38,7 @@ public final class NetworkCapabilities implements Parcelable {
      */
     public NetworkCapabilities() {
         clearAll();
-        mNetworkCapabilities =
-                (1 << NET_CAPABILITY_NOT_RESTRICTED) |
-                (1 << NET_CAPABILITY_TRUSTED) |
-                (1 << NET_CAPABILITY_NOT_VPN);
+        mNetworkCapabilities = DEFAULT_CAPABILITIES;
     }
 
     public NetworkCapabilities(NetworkCapabilities nc) {
@@ -187,6 +184,28 @@ public final class NetworkCapabilities implements Parcelable {
     private static final int MAX_NET_CAPABILITY = NET_CAPABILITY_CAPTIVE_PORTAL;
 
     /**
+     * Capabilities that are set by default when the object is constructed.
+     */
+    private static final long DEFAULT_CAPABILITIES =
+            (1 << NET_CAPABILITY_NOT_RESTRICTED) |
+            (1 << NET_CAPABILITY_TRUSTED) |
+            (1 << NET_CAPABILITY_NOT_VPN);
+
+    /**
+     * Capabilities that suggest that a network is restricted.
+     * {@see #maybeMarkCapabilitiesRestricted}.
+     */
+    private static final long RESTRICTED_CAPABILITIES =
+            (1 << NET_CAPABILITY_CBS) |
+            (1 << NET_CAPABILITY_DUN) |
+            (1 << NET_CAPABILITY_EIMS) |
+            (1 << NET_CAPABILITY_FOTA) |
+            (1 << NET_CAPABILITY_IA) |
+            (1 << NET_CAPABILITY_IMS) |
+            (1 << NET_CAPABILITY_RCS) |
+            (1 << NET_CAPABILITY_XCAP);
+
+    /**
      * Adds the given capability to this {@code NetworkCapability} instance.
      * Multiple capabilities may be applied sequentially.  Note that when searching
      * for a network to satisfy a request, all capabilities requested must be satisfied.
@@ -269,6 +288,22 @@ public final class NetworkCapabilities implements Parcelable {
     }
 
     /**
+     * Removes the NET_CAPABILITY_NOT_RESTRICTED capability if all the capabilities it provides are
+     * typically provided by restricted networks.
+     *
+     * TODO: consider:
+     * - Renaming it to guessRestrictedCapability and make it set the
+     *   restricted capability bit in addition to clearing it.
+     * @hide
+     */
+    public void maybeMarkCapabilitiesRestricted() {
+        // If all the capabilities are typically provided by restricted networks, conclude that this
+        // network is restricted.
+        if ((mNetworkCapabilities & ~(DEFAULT_CAPABILITIES | RESTRICTED_CAPABILITIES)) == 0)
+            removeCapability(NET_CAPABILITY_NOT_RESTRICTED);
+    }
+
+    /**
      * Representing the transport type.  Apps should generally not care about transport.  A
      * request for a fast internet connection could be satisfied by a number of different
      * transports.  If any are specified here it will be satisfied a Network that matches
diff --git a/core/java/android/net/NetworkRequest.java b/core/java/android/net/NetworkRequest.java
index e61594c..e184ec4 100644
--- a/core/java/android/net/NetworkRequest.java
+++ b/core/java/android/net/NetworkRequest.java
@@ -83,7 +83,13 @@ public class NetworkRequest implements Parcelable {
          * Build {@link NetworkRequest} give the current set of capabilities.
          */
         public NetworkRequest build() {
-            return new NetworkRequest(mNetworkCapabilities, ConnectivityManager.TYPE_NONE,
+            // Make a copy of mNetworkCapabilities so we don't inadvertently remove NOT_RESTRICTED
+            // when later an unrestricted capability could be added to mNetworkCapabilities, in
+            // which case NOT_RESTRICTED should be returned to mNetworkCapabilities, which
+            // maybeMarkCapabilitiesRestricted() doesn't add back.
+            final NetworkCapabilities nc = new NetworkCapabilities(mNetworkCapabilities);
+            nc.maybeMarkCapabilitiesRestricted();
+            return new NetworkRequest(nc, ConnectivityManager.TYPE_NONE,
                     ConnectivityManager.REQUEST_ID_UNSET);
         }
 
diff --git a/core/java/android/os/INetworkManagementService.aidl b/core/java/android/os/INetworkManagementService.aidl
index 8114155..cd84c8f 100644
--- a/core/java/android/os/INetworkManagementService.aidl
+++ b/core/java/android/os/INetworkManagementService.aidl
@@ -388,8 +388,10 @@ interface INetworkManagementService
 
     /**
      * Setup a new physical network.
+     * @param permission null if no permissions required to access this network.  PERMISSION_NETWORK
+     *                   or PERMISSION_SYSTEM to set respective permission.
      */
-    void createPhysicalNetwork(int netId);
+    void createPhysicalNetwork(int netId, String permission);
 
     /**
      * Setup a new VPN.
@@ -416,6 +418,13 @@ interface INetworkManagementService
     void setDefaultNetId(int netId);
     void clearDefaultNetId();
 
+    /**
+     * Set permission for a network.
+     * @param permission null to clear permissions. PERMISSION_NETWORK or PERMISSION_SYSTEM to set
+     *                   permission.
+     */
+    void setNetworkPermission(int netId, String permission);
+
     void setPermission(String permission, in int[] uids);
     void clearPermission(in int[] uids);
 
diff --git a/services/core/java/com/android/server/ConnectivityService.java b/services/core/java/com/android/server/ConnectivityService.java
index 6a22f22..0802d30 100644
--- a/services/core/java/com/android/server/ConnectivityService.java
+++ b/services/core/java/com/android/server/ConnectivityService.java
@@ -4024,6 +4024,16 @@ public class ConnectivityService extends IConnectivityManager.Stub
         }
         if (!Objects.equals(nai.networkCapabilities, networkCapabilities)) {
             final int oldScore = nai.getCurrentScore();
+            if (nai.networkCapabilities.hasCapability(NET_CAPABILITY_NOT_RESTRICTED) !=
+                    networkCapabilities.hasCapability(NET_CAPABILITY_NOT_RESTRICTED)) {
+                try {
+                    mNetd.setNetworkPermission(nai.network.netId,
+                            networkCapabilities.hasCapability(NET_CAPABILITY_NOT_RESTRICTED) ?
+                                    null : NetworkManagementService.PERMISSION_SYSTEM);
+                } catch (RemoteException e) {
+                    loge("Exception in setNetworkPermission: " + e);
+                }
+            }
             synchronized (nai) {
                 nai.networkCapabilities = networkCapabilities;
             }
@@ -4491,7 +4501,10 @@ public class ConnectivityService extends IConnectivityManager.Stub
                             (networkAgent.networkMisc == null ||
                                 !networkAgent.networkMisc.allowBypass));
                 } else {
-                    mNetd.createPhysicalNetwork(networkAgent.network.netId);
+                    mNetd.createPhysicalNetwork(networkAgent.network.netId,
+                            networkAgent.networkCapabilities.hasCapability(
+                                    NET_CAPABILITY_NOT_RESTRICTED) ?
+                                    null : NetworkManagementService.PERMISSION_SYSTEM);
                 }
             } catch (Exception e) {
                 loge("Error creating network " + networkAgent.network.netId + ": "
diff --git a/services/core/java/com/android/server/NetworkManagementService.java b/services/core/java/com/android/server/NetworkManagementService.java
index 0e3134d..433f707 100644
--- a/services/core/java/com/android/server/NetworkManagementService.java
+++ b/services/core/java/com/android/server/NetworkManagementService.java
@@ -131,6 +131,19 @@ public class NetworkManagementService extends INetworkManagementService.Stub
      */
     public static final String LIMIT_GLOBAL_ALERT = "globalAlert";
 
+    /**
+     * String to pass to netd to indicate that a network is only accessible
+     * to apps that have the CHANGE_NETWORK_STATE permission.
+     */
+    public static final String PERMISSION_NETWORK = "NETWORK";
+
+    /**
+     * String to pass to netd to indicate that a network is only
+     * accessible to system apps and those with the CONNECTIVITY_INTERNAL
+     * permission.
+     */
+    public static final String PERMISSION_SYSTEM = "SYSTEM";
+
     class NetdResponseCode {
         /* Keep in sync with system/netd/server/ResponseCode.h */
         public static final int InterfaceListResult       = 110;
@@ -2329,11 +2342,15 @@ public class NetworkManagementService extends INetworkManagementService.Stub
     }
 
     @Override
-    public void createPhysicalNetwork(int netId) {
+    public void createPhysicalNetwork(int netId, String permission) {
         mContext.enforceCallingOrSelfPermission(CONNECTIVITY_INTERNAL, TAG);
 
         try {
-            mConnector.execute("network", "create", netId);
+            if (permission != null) {
+                mConnector.execute("network", "create", netId, permission);
+            } else {
+                mConnector.execute("network", "create", netId);
+            }
         } catch (NativeDaemonConnectorException e) {
             throw e.rethrowAsParcelableException();
         }
@@ -2425,6 +2442,22 @@ public class NetworkManagementService extends INetworkManagementService.Stub
     }
 
     @Override
+    public void setNetworkPermission(int netId, String permission) {
+        mContext.enforceCallingOrSelfPermission(CONNECTIVITY_INTERNAL, TAG);
+
+        try {
+            if (permission != null) {
+                mConnector.execute("network", "permission", "network", "set", permission, netId);
+            } else {
+                mConnector.execute("network", "permission", "network", "clear", netId);
+            }
+        } catch (NativeDaemonConnectorException e) {
+            throw e.rethrowAsParcelableException();
+        }
+    }
+
+
+    @Override
     public void setPermission(String permission, int[] uids) {
         mContext.enforceCallingOrSelfPermission(CONNECTIVITY_INTERNAL, TAG);
 
diff --git a/services/tests/servicestests/src/com/android/server/ConnectivityServiceTest.java b/services/tests/servicestests/src/com/android/server/ConnectivityServiceTest.java
index 19d29f3..696f106 100644
--- a/services/tests/servicestests/src/com/android/server/ConnectivityServiceTest.java
+++ b/services/tests/servicestests/src/com/android/server/ConnectivityServiceTest.java
@@ -937,6 +937,19 @@ public class ConnectivityServiceTest extends AndroidTestCase {
     }
 
     private void tryNetworkFactoryRequests(int capability) throws Exception {
+        // Verify NOT_RESTRICTED is set appropriately
+        final NetworkCapabilities nc = new NetworkRequest.Builder().addCapability(capability)
+                .build().networkCapabilities;
+        if (capability == NET_CAPABILITY_CBS || capability == NET_CAPABILITY_DUN ||
+                capability == NET_CAPABILITY_EIMS || capability == NET_CAPABILITY_FOTA ||
+                capability == NET_CAPABILITY_IA || capability == NET_CAPABILITY_IMS ||
+                capability == NET_CAPABILITY_RCS || capability == NET_CAPABILITY_XCAP ||
+                capability == NET_CAPABILITY_TRUSTED || capability == NET_CAPABILITY_NOT_VPN) {
+            assertFalse(nc.hasCapability(NET_CAPABILITY_NOT_RESTRICTED));
+        } else {
+            assertTrue(nc.hasCapability(NET_CAPABILITY_NOT_RESTRICTED));
+        }
+
         NetworkCapabilities filter = new NetworkCapabilities();
         filter.addCapability(capability);
         final HandlerThread handlerThread = new HandlerThread("testNetworkFactoryRequests");