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Vendor TextDrawable and TrustedIntents

Browse source 
These were the only two libraries we were still getting from JCenter,
which was permanently shut down recently: https://jfrog.com/blog/jcenter-sunset/
This commit is contained in:
Alexander Bakker 2024-08-26 23:06:09 +02:00
parent 9eae773efb
commit 991da65af0
14 changed files with 1791 additions and 247 deletions
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app/src/main/java/info/guardianproject/trustedintents/ApkSignaturePin.java Normal file
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package info.guardianproject.trustedintents;
import android.content.pm.Signature;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
public abstract class ApkSignaturePin {
protected String[] fingerprints; // hex-encoded SHA-256 hashes of the certs
protected byte[][] certificates; // array of DER-encoded X.509 certificates
private Signature[] signatures;
public Signature[] getSignatures() {
if (signatures == null) {
signatures = new Signature[certificates.length];
for (int i = 0; i < certificates.length; i++)
signatures[i] = new Signature(certificates[i]);
}
return signatures;
}
/**
* Gets the fingerprint of the first certificate in the signature.
*
* @param algorithm - Which hash to use (e.g. MD5, SHA1, SHA-256)
* @return the fingerprint as hex String
*/
public String getFingerprint(String algorithm) {
try {
MessageDigest md = MessageDigest.getInstance(algorithm);
byte[] hashBytes = md.digest(certificates[0]);
BigInteger bi = new BigInteger(1, hashBytes);
md.reset();
return String.format("%0" + (hashBytes.length << 1) + "x", bi);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return null;
}
/**
* Gets the MD5 fingerprint of the first certificate in the signature.
*
* @return the MD5 sum as hex String
*/
public String getMD5Fingerprint() {
return getFingerprint("MD5");
}
/**
* Gets the SHA1 fingerprint of the first certificate in the signature.
*
* @return the SHA1 sum as hex String
*/
public String getSHA1Fingerprint() {
return getFingerprint("SHA1");
}
/**
* Gets the SHA-256 fingerprint of the first certificate in the signature.
*
* @return the SHA-256 sum as hex String
*/
public String getSHA256Fingerprint() {
return getFingerprint("SHA-256");
}
/**
* Compares the calculated SHA-256 cert fingerprint to the stored one.
*
* @return the result of the comparison
*/
public boolean doFingerprintsMatchCertificates() {
if (fingerprints == null || certificates == null)
return false;
String[] calcedFingerprints = new String[certificates.length];
for (int i = 0; i < calcedFingerprints.length; i++)
calcedFingerprints[i] = getSHA256Fingerprint();
if (fingerprints.length == 0 || calcedFingerprints.length == 0)
return false;
return Arrays.equals(fingerprints, calcedFingerprints);
}
}

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app/src/main/java/info/guardianproject/trustedintents/LICENSE.txt Normal file
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app/src/main/java/info/guardianproject/trustedintents/TrustedIntents.java Normal file
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package info.guardianproject.trustedintents;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.ResolveInfo;
import android.content.pm.Signature;
import android.text.TextUtils;
import android.util.Log;
import java.lang.reflect.Constructor;
import java.security.cert.CertificateException;
import java.util.LinkedHashSet;
public class TrustedIntents {
private static TrustedIntents instance;
private static PackageManager pm;
private final LinkedHashSet<ApkSignaturePin> pinList;
private TrustedIntents(Context context) {
pm = context.getPackageManager();
this.pinList = new LinkedHashSet<ApkSignaturePin>();
}
public static TrustedIntents get(Context context) {
if (instance == null)
instance = new TrustedIntents(context);
return instance;
}
/**
* Check whether a resolved {@link Activity} is trusted.
*
* @param resolveInfo the one to check
* @return whether the {@code Intent}'s receiver is trusted
*/
public boolean isReceiverTrusted(ResolveInfo resolveInfo) {
return isPackageNameTrusted(resolveInfo.activityInfo.packageName);
}
/**
* Check whether a resolved {@link Activity} is trusted.
*
* @param activityInfo the one to check
* @return whether the {@code Intent}'s receiver is trusted
*/
public boolean isReceiverTrusted(ActivityInfo activityInfo) {
return isPackageNameTrusted(activityInfo.packageName);
}
/**
* Check an {@link Intent} is trusted based on the {@code packageName} set
* by {@link Intent#setPackage(String)}
*
* @param intent the one to check
* @return whether the {@code Intent}'s receiver is trusted
*/
public boolean isReceiverTrusted(Intent intent) {
if (!isIntentSane(intent))
return false;
String packageName = intent.getPackage();
if (TextUtils.isEmpty(packageName)) {
packageName = intent.getComponent().getPackageName();
}
return isPackageNameTrusted(packageName);
}
/**
* Check whether a {@code packageName} is trusted.
*
* @param packageName the one to check
* @return whether the {@code packageName} is trusted
*/
public boolean isPackageNameTrusted(String packageName) {
try {
checkTrustedSigner(packageName);
} catch (NameNotFoundException e) {
e.printStackTrace();
return false;
} catch (CertificateException e) {
return false;
}
return true;
}
/**
* Returns an {@link Intent} if the sending app is signed by one of
* the trusted signing keys as set in {@link #addTrustedSigner(Class)}.
*
* @returns {@code null} if there is no {@code Intent} or if the
* sender is not trusted.
* @see #addTrustedSigner(Class)
*/
public Intent getIntentFromTrustedSender(Activity activity) {
Intent intent = activity.getIntent();
String packageName = getCallingPackageName(activity);
if (TextUtils.isEmpty(packageName)) {
return null;
}
if (isPackageNameTrusted(packageName)) {
return intent;
}
return null;
}
/**
* Get the package name of the {@link Activity} that sent the
* {@link Intent} that started this {@code Activity}.
* <p/>
* <strong>WARNING</strong>: If the {@code Activity} has
* {@code android:launchMode="singleInstance"} or {@code "singleTask"}, then
* this method will not disconnect because it is not possible to get the
* calling {@code Activity}, as set by
* {@link Activity#startActivityForResult(Intent, int)}
*
* @param activity the {@code Activity} to check for the {@code Intent}
* @return the package of the sending app or {@code null} if it was not a
* {@code ACTION_CONNECT Intent} or the {@code Intent} was not sent
* with {@link Activity#startActivityForResult(Intent, int)}
*/
public static String getCallingPackageName(Activity activity) {
// getCallingPackage() was unstable until android-18, use this
ComponentName componentName = activity.getCallingActivity();
if (componentName == null)
return null;
String packageName = componentName.getPackageName();
if (TextUtils.isEmpty(packageName)) {
Log.e(activity.getClass().getSimpleName(),
"Received Intent without sender! The Intent must be sent using startActivityForResult() and received without launchMode singleTask or singleInstance!");
}
return packageName;
}
/**
* This is used to check whether an {@link Intent} that will be sent is
* complete. It should <strong>not</strong> be used with {@code Intent}s
* that have been received already.
*/
private boolean isIntentSane(Intent intent) {
if (intent == null)
return false;
if (TextUtils.isEmpty(intent.getPackage())) {
ComponentName componentName = intent.getComponent();
if (componentName == null || TextUtils.isEmpty(componentName.getPackageName())) {
return false;
}
}
return true;
}
/**
* Add an APK signature that is always trusted for any packageName.
*
* @param cls {@link Class} of the {@link ApkSignaturePin} to trust
* @return boolean
* @throws {@link IllegalArgumentException} the class cannot be instantiated
*/
public boolean addTrustedSigner(Class<? extends ApkSignaturePin> cls) {
try {
Constructor<? extends ApkSignaturePin> constructor = cls.getConstructor();
return pinList.add((ApkSignaturePin) constructor.newInstance((Object[]) null));
} catch (Exception e) {
e.printStackTrace();
throw new IllegalArgumentException(e);
}
}
/**
* Remove an APK signature from the trusted set.
*
* @param cls {@link Class} of the {@link ApkSignaturePin} to remove
*/
public boolean removeTrustedSigner(Class<? extends ApkSignaturePin> cls) {
for (ApkSignaturePin pin : pinList) {
if (pin.getClass().equals(cls)) {
return pinList.remove(pin);
}
}
return false;
}
/**
* Remove all {@link ApkSignaturePin}s from the trusted set.
*/
public boolean removeAllTrustedSigners() {
pinList.clear();
return pinList.isEmpty();
}
/**
* Check if a {@link ApkSignaturePin} is trusted.
*
* @param cls {@link Class} of the {@link ApkSignaturePin} to check
*/
public boolean isTrustedSigner(Class<? extends ApkSignaturePin> cls) {
for (ApkSignaturePin pin : pinList) {
if (pin.getClass().equals(cls)) {
return true;
}
}
return false;
}
public void checkTrustedSigner(String packageName)
throws NameNotFoundException, CertificateException {
PackageInfo packageInfo = pm.getPackageInfo(packageName, PackageManager.GET_SIGNATURES);
checkTrustedSigner(packageInfo.signatures);
}
public void checkTrustedSigner(PackageInfo packageInfo)
throws NameNotFoundException, CertificateException {
checkTrustedSigner(packageInfo.signatures);
}
public void checkTrustedSigner(Signature[] signatures)
throws NameNotFoundException, CertificateException {
if (signatures == null || signatures.length == 0)
throw new CertificateException("signatures cannot be null or empty!");
for (int i = 0; i < signatures.length; i++)
if (signatures[i] == null || signatures[i].toByteArray().length == 0)
throw new CertificateException("Certificates cannot be null or empty!");
// check whether the APK signer is trusted for all apps
for (ApkSignaturePin pin : pinList)
if (areSignaturesEqual(signatures, pin.getSignatures()))
return; // found a matching trusted APK signer
throw new CertificateException("APK signatures did not match!");
}
public boolean areSignaturesEqual(Signature[] sigs0, Signature[] sigs1) {
// TODO where is Android's implementation of this that I can just call?
if (sigs0 == null || sigs1 == null)
return false;
if (sigs0.length == 0 || sigs1.length == 0)
return false;
if (sigs0.length != sigs1.length)
return false;
for (int i = 0; i < sigs0.length; i++)
if (!sigs0[i].equals(sigs1[i]))
return false;
return true;
}
public void startActivity(Context context, Intent intent) throws CertificateException {
if (!isIntentSane(intent))
throw new ActivityNotFoundException("The intent was null or empty!");
String packageName = intent.getPackage();
if (TextUtils.isEmpty(packageName)) {
packageName = intent.getComponent().getPackageName();
intent.setPackage(packageName);
}
try {
checkTrustedSigner(packageName);
} catch (NameNotFoundException e) {
e.printStackTrace();
throw new ActivityNotFoundException(e.getLocalizedMessage());
}
context.startActivity(intent);
}
}