Merge changes from topic "ignore-vendor-apex-allowlists" am: a22612eb94 (8ceedbd3) · Commits · e / os / android_frameworks_base

core/java/com/android/server/SystemConfig.java

+27 −6

Original line number	Diff line number	Diff line
		@@ -663,6 +663,7 @@ public class SystemConfig {
		readPermissions(parser, Environment.buildPath(f, "etc", "permissions"),
		apexPermissionFlag);
		}
		pruneVendorApexPrivappAllowlists();
		}

		@VisibleForTesting
		@@ -1175,7 +1176,8 @@ public class SystemConfig {
		readPrivAppPermissions(parser, mSystemExtPrivAppPermissions,
		mSystemExtPrivAppDenyPermissions);
		} else if (apex) {
		readApexPrivAppPermissions(parser, permFile);
		readApexPrivAppPermissions(parser, permFile,
		Environment.getApexDirectory().toPath());
		} else {
		readPrivAppPermissions(parser, mPrivAppPermissions,
		mPrivAppDenyPermissions);
		@@ -1525,6 +1527,21 @@ public class SystemConfig {
		}
		}

		/**
		* Prunes out any privileged permission allowlists bundled in vendor apexes.
		*/
		@VisibleForTesting
		public void pruneVendorApexPrivappAllowlists() {
		for (String moduleName: mAllowedVendorApexes.keySet()) {
		if (mApexPrivAppPermissions.containsKey(moduleName)
		\|\| mApexPrivAppDenyPermissions.containsKey(moduleName)) {
		Slog.w(TAG, moduleName + " is a vendor apex, ignore its priv-app allowlist");
		mApexPrivAppPermissions.remove(moduleName);
		mApexPrivAppDenyPermissions.remove(moduleName);
		}
		}
		}

		private void readInstallInUserType(XmlPullParser parser,
		Map<String, Set<String>> doInstallMap,
		Map<String, Set<String>> nonInstallMap)
		@@ -1735,8 +1752,7 @@ public class SystemConfig {
		/**
		* Returns the module name for a file in the apex module's partition.
		*/
		private String getApexModuleNameFromFilePath(Path path) {
		final Path apexDirectoryPath = Environment.getApexDirectory().toPath();
		private String getApexModuleNameFromFilePath(Path path, Path apexDirectoryPath) {
		if (!path.startsWith(apexDirectoryPath)) {
		throw new IllegalArgumentException("File " + path + " is not part of an APEX.");
		}
		@@ -1748,9 +1764,14 @@ public class SystemConfig {
		return path.getName(apexDirectoryPath.getNameCount()).toString();
		}

		private void readApexPrivAppPermissions(XmlPullParser parser, File permFile)
		throws IOException, XmlPullParserException {
		final String moduleName = getApexModuleNameFromFilePath(permFile.toPath());
		/**
		* Reads the contents of the privileged permission allowlist stored inside an APEX.
		*/
		@VisibleForTesting
		public void readApexPrivAppPermissions(XmlPullParser parser, File permFile,
		Path apexDirectoryPath) throws IOException, XmlPullParserException {
		final String moduleName =
		getApexModuleNameFromFilePath(permFile.toPath(), apexDirectoryPath);
		final ArrayMap<String, ArraySet<String>> privAppPermissions;
		if (mApexPrivAppPermissions.containsKey(moduleName)) {
		privAppPermissions = mApexPrivAppPermissions.get(moduleName);

services/tests/servicestests/src/com/android/server/systemconfig/SystemConfigTest.java

+112 −5

Original line number	Diff line number	Diff line
		@@ -39,9 +39,11 @@ import org.junit.Test;
		import org.junit.rules.TemporaryFolder;
		import org.junit.runner.RunWith;
		import org.xmlpull.v1.XmlPullParser;
		import org.xmlpull.v1.XmlPullParserException;

		import java.io.BufferedWriter;
		import java.io.File;
		import java.io.FileReader;
		import java.io.FileWriter;
		import java.io.IOException;
		import java.util.Arrays;
		@@ -137,13 +139,14 @@ public class SystemConfigTest {
		new ArraySet<>(Arrays.asList("GUEST", "PROFILE")));

		final File folder1 = createTempSubfolder("folder1");
		createTempFile(folder1, "permFile1.xml", contents1);
		createTempFile(folder1, "permissionFile1.xml", contents1);

		final File folder2 = createTempSubfolder("folder2");
		createTempFile(folder2, "permFile2.xml", contents2);
		createTempFile(folder2, "permissionFile2.xml", contents2);

		// Also, make a third file, but with the name folder1/permFile2.xml, to prove no conflicts.
		createTempFile(folder1, "permFile2.xml", contents3);
		// Also, make a third file, but with the name folder1/permissionFile2.xml, to prove no
		// conflicts.
		createTempFile(folder1, "permissionFile2.xml", contents3);

		readPermissions(folder1, /* No permission needed anyway */ 0);
		readPermissions(folder2, /* No permission needed anyway */ 0);
		@@ -333,6 +336,91 @@ public class SystemConfigTest {
		assertThat(mSysConfig.getAllowedVendorApexes()).isEmpty();
		}

		@Test
		public void readApexPrivAppPermissions_addAllPermissions()
		throws Exception {
		final String contents =
		"<privapp-permissions package=\"com.android.apk_in_apex\">"
		+ "<permission name=\"android.permission.FOO\"/>"
		+ "<deny-permission name=\"android.permission.BAR\"/>"
		+ "</privapp-permissions>";
		File apexDir = createTempSubfolder("apex");
		File permissionFile = createTempFile(
		createTempSubfolder("apex/com.android.my_module/etc/permissions"),
		"permissions.xml", contents);
		XmlPullParser parser = readXmlUntilStartTag(permissionFile);

		mSysConfig.readApexPrivAppPermissions(parser, permissionFile, apexDir.toPath());

		assertThat(mSysConfig.getApexPrivAppPermissions("com.android.my_module",
		"com.android.apk_in_apex"))
		.containsExactly("android.permission.FOO");
		assertThat(mSysConfig.getApexPrivAppDenyPermissions("com.android.my_module",
		"com.android.apk_in_apex"))
		.containsExactly("android.permission.BAR");
		}

		@Test
		public void pruneVendorApexPrivappAllowlists_removeVendor()
		throws Exception {
		File apexDir = createTempSubfolder("apex");

		// Read non-vendor apex permission allowlists
		final String allowlistNonVendorContents =
		"<privapp-permissions package=\"com.android.apk_in_non_vendor_apex\">"
		+ "<permission name=\"android.permission.FOO\"/>"
		+ "<deny-permission name=\"android.permission.BAR\"/>"
		+ "</privapp-permissions>";
		File nonVendorPermDir =
		createTempSubfolder("apex/com.android.non_vendor/etc/permissions");
		File nonVendorPermissionFile =
		createTempFile(nonVendorPermDir, "permissions.xml", allowlistNonVendorContents);
		XmlPullParser nonVendorParser = readXmlUntilStartTag(nonVendorPermissionFile);
		mSysConfig.readApexPrivAppPermissions(nonVendorParser, nonVendorPermissionFile,
		apexDir.toPath());

		// Read vendor apex permission allowlists
		final String allowlistVendorContents =
		"<privapp-permissions package=\"com.android.apk_in_vendor_apex\">"
		+ "<permission name=\"android.permission.BAZ\"/>"
		+ "<deny-permission name=\"android.permission.BAT\"/>"
		+ "</privapp-permissions>";
		File vendorPermissionFile =
		createTempFile(createTempSubfolder("apex/com.android.vendor/etc/permissions"),
		"permissions.xml", allowlistNonVendorContents);
		XmlPullParser vendorParser = readXmlUntilStartTag(vendorPermissionFile);
		mSysConfig.readApexPrivAppPermissions(vendorParser, vendorPermissionFile,
		apexDir.toPath());

		// Read allowed vendor apex list
		final String allowedVendorContents =
		"<config>\n"
		+ " <allowed-vendor-apex package=\"com.android.vendor\" "
		+ "installerPackage=\"com.installer\" />\n"
		+ "</config>";
		final File allowedVendorFolder = createTempSubfolder("folder");
		createTempFile(allowedVendorFolder, "vendor-apex-allowlist.xml", allowedVendorContents);
		readPermissions(allowedVendorFolder, /* Grant all permission flags */ ~0);

		// Finally, prune non-vendor allowlists.
		// There is no guarantee in which order the above reads will be done, however pruning
		// will always happen last.
		mSysConfig.pruneVendorApexPrivappAllowlists();

		assertThat(mSysConfig.getApexPrivAppPermissions("com.android.non_vendor",
		"com.android.apk_in_non_vendor_apex"))
		.containsExactly("android.permission.FOO");
		assertThat(mSysConfig.getApexPrivAppDenyPermissions("com.android.non_vendor",
		"com.android.apk_in_non_vendor_apex"))
		.containsExactly("android.permission.BAR");
		assertThat(mSysConfig.getApexPrivAppPermissions("com.android.vendor",
		"com.android.apk_in_vendor_apex"))
		.isNull();
		assertThat(mSysConfig.getApexPrivAppDenyPermissions("com.android.vendor",
		"com.android.apk_in_vendor_apex"))
		.isNull();
		}

		/**
		* Tests that readPermissions works correctly for a library with on-bootclasspath-before
		* and on-bootclasspath-since.
		@@ -491,6 +579,25 @@ public class SystemConfigTest {
		readPermissions(folder, /* permissionFlag = ALLOW_LIBS */ 0x02);
		}

		/**
		* Create an {@link XmlPullParser} for {@param permissionFile} and begin parsing it until
		* reaching the root tag.
		*/
		private XmlPullParser readXmlUntilStartTag(File permissionFile)
		throws IOException, XmlPullParserException {
		FileReader permReader = new FileReader(permissionFile);
		XmlPullParser parser = Xml.newPullParser();
		parser.setInput(permReader);
		int type;
		do {
		type = parser.next();
		} while (type != parser.START_TAG && type != parser.END_DOCUMENT);
		if (type != parser.START_TAG) {
		throw new XmlPullParserException("No start tag found");
		}
		return parser;
		}

		/**
		* Creates folderName/fileName in the mTemporaryFolder and fills it with the contents.
		*
		@@ -500,7 +607,7 @@ public class SystemConfigTest {
		private File createTempSubfolder(String folderName)
		throws IOException {
		File folder = new File(mTemporaryFolder.getRoot(), folderName);
		folder.mkdir();
		folder.mkdirs();
		return folder;
		}