Document that WebView doesn't honor "uses cleartext traffic" flag. (fbf4599a) · Commits · e / os / android_frameworks_base

core/java/android/content/pm/ApplicationInfo.java

+8 −2

Original line number	Diff line number	Diff line
		@@ -339,8 +339,14 @@ public class ApplicationInfo extends PackageItemInfo implements Parcelable {
		* (e.g., HTTP rather than HTTPS; WebSockets rather than WebSockets Secure; XMPP, IMAP, STMP
		* without STARTTLS or TLS). If {@code false}, the app declares that it does not intend to use
		* cleartext network traffic, in which case platform components (e.g., HTTP stacks,
		* {@code WebView}, {@code DownloadManager}, {@code MediaPlayer}) will refuse app's requests to
		* use cleartext traffic. Third-party libraries are encouraged to honor this flag as well.
		* {@code DownloadManager}, {@code MediaPlayer}) will refuse app's requests to use cleartext
		* traffic. Third-party libraries are encouraged to honor this flag as well.
		*
		* <p>NOTE: {@code WebView} does not honor this flag.
		*
		* <p>This flag comes from
		* {@link android.R.styleable#AndroidManifestApplication_usesCleartextTraffic
		* android:usesCleartextTraffic} of the <application> tag.
		*/
		public static final int FLAG_USES_CLEARTEXT_TRAFFIC = 1<<27;

core/java/android/security/NetworkSecurityPolicy.java

+5 −3

Original line number	Diff line number	Diff line
		@@ -46,9 +46,9 @@ public class NetworkSecurityPolicy {
		* without TLS or STARTTLS) is permitted for this process.
		*
		* <p>When cleartext network traffic is not permitted, the platform's components (e.g. HTTP and
		* FTP stacks, {@link android.webkit.WebView}, {@link android.app.DownloadManager},
		* {@link android.media.MediaPlayer}) will refuse this process's requests to use cleartext
		* traffic. Third-party libraries are strongly encouraged to honor this setting as well.
		* FTP stacks, {@link android.app.DownloadManager}, {@link android.media.MediaPlayer}) will
		* refuse this process's requests to use cleartext traffic. Third-party libraries are strongly
		* encouraged to honor this setting as well.
		*
		* <p>This flag is honored on a best effort basis because it's impossible to prevent all
		* cleartext traffic from Android applications given the level of access provided to them. For
		@@ -56,6 +56,8 @@ public class NetworkSecurityPolicy {
		* because it cannot determine whether its traffic is in cleartext. However, most network
		* traffic from applications is handled by higher-level network stacks/components which can
		* honor this aspect of the policy.
		*
		* <p>NOTE: {@link android.webkit.WebView} does not honor this flag.
		*/
		public boolean isCleartextTrafficPermitted() {
		return libcore.net.NetworkSecurityPolicy.isCleartextTrafficPermitted();

core/res/res/values/attrs_manifest.xml

+6 −5

Original line number	Diff line number	Diff line
		@@ -393,8 +393,9 @@
		WebSockets rather than WebSockets Secure; XMPP, IMAP, STMP without STARTTLS or TLS.
		Defaults to true. If set to false {@code false}, the application declares that it does not
		intend to use cleartext network traffic, in which case platform components (e.g. HTTP
		stacks, {@code WebView}, {@code MediaPlayer}) will refuse applications's requests to use
		cleartext traffic. Third-party libraries are encouraged to honor this flag as well. -->
		stacks, {@code DownloadManager}, {@code MediaPlayer}) will refuse applications's requests
		to use cleartext traffic. Third-party libraries are encouraged to honor this flag as well.
		-->
		<attr name="usesCleartextTraffic" format="boolean" />

		<!-- Declare that code from this application will need to be loaded into other
		@@ -1228,9 +1229,9 @@
		HTTPS; WebSockets rather than WebSockets Secure; XMPP, IMAP, STMP without STARTTLS or
		TLS). Defaults to true. If set to false {@code false}, the application declares that it
		does not intend to use cleartext network traffic, in which case platform components
		(e.g. HTTP stacks, {@code WebView}, {@code MediaPlayer}) will refuse applications's
		requests to use cleartext traffic. Third-party libraries are encouraged to honor this
		flag as well. -->
		(e.g. HTTP stacks, {@code DownloadManager}, {@code MediaPlayer}) will refuse
		applications's requests to use cleartext traffic. Third-party libraries are encouraged
		to honor this flag as well. -->
		<attr name="usesCleartextTraffic" />
		<attr name="multiArch" />
		<attr name="extractNativeLibs" />

docs/html/guide/topics/manifest/application-element.jd

+7 −6

Original line number	Diff line number	Diff line
		@@ -452,12 +452,11 @@ href="{@docRoot}guide/topics/ui/actionbar.html">Action Bar</a> developer guide.<
		The default value is {@code "true"}.

		<p>When the attribute is set to {@code "false"}, platform components (for example, HTTP and FTP
		stacks, {@link android.webkit.WebView}, {@link android.app.DownloadManager},
		{@link android.media.MediaPlayer}) will refuse the app's requests to use cleartext traffic.
		Third-party libraries are strongly encouraged to honor this setting as well. The key reason for
		avoiding cleartext traffic is the lack of confidentiality, authenticity, and protections against
		tampering: a network attacker can eavesdrop on transmitted data and also modify it without being
		detected.
		stacks, {@link android.app.DownloadManager}, {@link android.media.MediaPlayer}) will refuse the
		app's requests to use cleartext traffic. Third-party libraries are strongly encouraged to honor this
		setting as well. The key reason for avoiding cleartext traffic is the lack of confidentiality,
		authenticity, and protections against tampering: a network attacker can eavesdrop on transmitted
		data and also modify it without being detected.

		<p>This flag is honored on a best effort basis because it's impossible to prevent all cleartext
		traffic from Android applications given the level of access provided to them. For example, there's
		@@ -467,6 +466,8 @@ handled by higher-level network stacks/components which can honor this flag by e
		from {@link android.content.pm.ApplicationInfo#flags ApplicationInfo.flags} or
		{@link android.security.NetworkSecurityPolicy#isCleartextTrafficPermitted() NetworkSecurityPolicy.isCleartextTrafficPermitted()}.

		<p>NOTE: {@link android.webkit.WebView} does not honor this flag.

		<p>During app development, StrictMode can be used to identify any cleartext traffic from the app: see
		{@link android.os.StrictMode.VmPolicy.Builder#detectCleartextNetwork() StrictMode.VmPolicy.Builder.detectCleartextNetwork()}.