Apply suggestions from code review - fix typos/style, make things private

Co-authored-by: Tony Torralba <atorralba@users.noreply.github.com>

Author: joefarebrother

java/ql/lib/semmle/code/java/security/ImproperIntentVerificationQuery.qll

@@ -10,7 +10,7 @@ private class OnReceiveMethod extends Method {
         .hasQualifiedName("android.content", "BroadcastReceiver", "onReceive")
   }
 
-  /** Gets the paramter of this method that holds the received `Intent`. */
+  /** Gets the parameter of this method that holds the received `Intent`. */
   Parameter getIntentParameter() { result = this.getParameter(1) }
 }
 
@@ -30,7 +30,7 @@ private class VerifiedIntentConfig extends DataFlow::Configuration {
   }
 }
 
-/** An `onReceive` method that doesn't verify the action of the intent it recieves. */
+/** An `onReceive` method that doesn't verify the action of the intent it receives. */
 class UnverifiedOnReceiveMethod extends OnReceiveMethod {
   UnverifiedOnReceiveMethod() {
     not any(VerifiedIntentConfig c).hasFlow(DataFlow::parameterNode(this.getIntentParameter()), _)
@@ -70,7 +70,7 @@ class SystemActionName extends Top {
     )
   }
 
-  /** Gets the name of the system intent that this expression or attriute represents. */
+  /** Gets the name of the system intent that this expression or attribute represents. */
   string getName() { result = name }
 
   override string toString() {
@@ -125,8 +125,8 @@ private class RegisterSystemActionConfig extends DataFlow::Configuration {
   }
 }
 
-/** Holds if `rrc` registers a reciever `orm` to recieve the system action `sa` that doesn't verifiy intents it recieves. */
-predicate registeredUnverifiedSystemReceiver(
+/** Holds if `rrc` registers a receiver `orm` to receive the system action `sa` that doesn't verify the intents it receives. */
+private predicate registeredUnverifiedSystemReceiver(
   RegisterReceiverCall rrc, UnverifiedOnReceiveMethod orm, SystemActionName sa
 ) {
   exists(RegisterSystemActionConfig conf, ConstructorCall cc |
@@ -136,8 +136,8 @@ predicate registeredUnverifiedSystemReceiver(
   )
 }
 
-/** Holds if the XML element `rec` declares a reciever `orm` to recieve the system action named `sa` that doesn't verifiy intents it recieves. */
-predicate xmlUnverifiedSystemReceiver(
+/** Holds if the XML element `rec` declares a receiver `orm` to receive the system action named `sa` that doesn't verify intents it receives. */
+private predicate xmlUnverifiedSystemReceiver(
   XMLElement rec, UnverifiedOnReceiveMethod orm, SystemActionName sa
 ) {
   exists(XMLElement filter, XMLElement action, Class ormty |
@@ -152,7 +152,7 @@ predicate xmlUnverifiedSystemReceiver(
   )
 }
 
-/** Holds if `reg` registers (either explicitly or through XML) a reciever `orm` to recieve the system action named `sa` that doesn't verify intents it recieves. */
+/** Holds if `reg` registers (either explicitly or through XML) a receiver `orm` to receive the system action named `sa` that doesn't verify the intents it receives. */
 predicate unverifiedSystemReceiver(Top reg, Method orm, SystemActionName sa) {
   registeredUnverifiedSystemReceiver(reg, orm, sa) or
   xmlUnverifiedSystemReceiver(reg, orm, sa)

java/ql/src/Security/CWE/CWE-925/Bad.java

@@ -1,8 +1,8 @@
-...
+// ...
 IntentFilter filter = new IntentFilter(Intent.ACTION_SHUTDOWN);
 BroadcastReceiver sReceiver = new ShutDownReceiver();
 context.registerReceiver(sReceiver, filter);
-...
+// ...
 
 public class ShutdownReceiver extends BroadcastReceiver {
     @Override

java/ql/src/Security/CWE/CWE-925/Good.java

@@ -1,8 +1,8 @@
-...
+// ...
 IntentFilter filter = new IntentFilter(Intent.ACTION_SHUTDOWN);
 BroadcastReceiver sReceiver = new ShutDownReceiver();
 context.registerReceiver(sReceiver, filter);
-...
+// ...
 
 public class ShutdownReceiver extends BroadcastReceiver {
     @Override

java/ql/src/Security/CWE/CWE-925/ImproperIntentVerification.qhelp

@@ -6,18 +6,18 @@
 
 <overview>
 <p>
-When an android application uses a <code>BroadcastReciever</code> to receive Intents, 
-it is also able to receive explicit Intents that are sent drctly to it, egardless of its filter.
+When an android application uses a <code>BroadcastReciever</code> to receive intents, 
+it is also able to receive explicit intents that are sent directly to it, regardless of its filter.
 
 Certain intent actions are only able to be sent by the operating system, not third-party applications. 
-However, a <code>BroadcastReceiver</code> that is registered to recieve system intents is still able to recieve 
+However, a <code>BroadcastReceiver</code> that is registered to receive system intents is still able to receive 
 other intents from a third-party application, so it should check that the intent received has the expected action.
-Otherwise, a third-party application could impersonate the system this way and cause unintended behaviour, such as a denial of service.
+Otherwise, a third-party application could impersonate the system this way and cause unintended behavior, such as a denial of service.
 </p>
 </overview>
 
 <example>
-  <p>In the following code, the <code>ShutdownReceiver</code> initiates a shutdown procedure upon receiving an Intent, 
+  <p>In the following code, the <code>ShutdownReceiver</code> initiates a shutdown procedure upon receiving an intent, 
   without checking that the received action is indeed <code>ACTION_SHUTDOWN</code>. This allows third-party applications to 
   send explicit intents to this receiver to cause a denial of service.</p>
 <sample src="Bad.java" />

java/ql/src/change-notes/2022-04-27-intent-verification.md

@@ -2,5 +2,5 @@
 category: newQuery
 ---
 * A new query "Improper Verification of Intent by Broadcast Receiver" (`java/improper-intent-verification`) has been added. 
-This query finds instances of Android `BroadcastReceiver`s that don't verify the action string of received Intents when registered
+This query finds instances of Android `BroadcastReceiver`s that don't verify the action string of received intents when registered
 to receive system intents.