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k-9/src/com/fsck/k9/crypto/Apg.java

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Java
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package com.fsck.k9.crypto;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.ContentUris;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import android.database.Cursor;
import android.net.Uri;
import android.support.v4.app.Fragment;
import android.widget.Toast;
import com.fsck.k9.R;
import com.fsck.k9.activity.MessageCompose;
import com.fsck.k9.mail.Message;
import com.fsck.k9.mail.MessagingException;
import com.fsck.k9.mail.Part;
import com.fsck.k9.mail.internet.MimeUtility;
/**
* APG integration.
*/
public class Apg extends CryptoProvider {
static final long serialVersionUID = 0x21071235;
public static final String NAME = "apg";
private static final String mApgPackageName = "org.thialfihar.android.apg";
private static final int mMinRequiredVersion = 16;
public static final String AUTHORITY = "org.thialfihar.android.apg.provider";
public static final Uri CONTENT_URI_SECRET_KEY_RING_BY_KEY_ID =
Uri.parse("content://" + AUTHORITY + "/key_rings/secret/key_id/");
public static final Uri CONTENT_URI_SECRET_KEY_RING_BY_EMAILS =
Uri.parse("content://" + AUTHORITY + "/key_rings/secret/emails/");
public static final Uri CONTENT_URI_PUBLIC_KEY_RING_BY_KEY_ID =
Uri.parse("content://" + AUTHORITY + "/key_rings/public/key_id/");
public static final Uri CONTENT_URI_PUBLIC_KEY_RING_BY_EMAILS =
Uri.parse("content://" + AUTHORITY + "/key_rings/public/emails/");
public static class Intent {
public static final String DECRYPT = "org.thialfihar.android.apg.intent.DECRYPT";
public static final String ENCRYPT = "org.thialfihar.android.apg.intent.ENCRYPT";
public static final String DECRYPT_FILE = "org.thialfihar.android.apg.intent.DECRYPT_FILE";
public static final String ENCRYPT_FILE = "org.thialfihar.android.apg.intent.ENCRYPT_FILE";
public static final String DECRYPT_AND_RETURN = "org.thialfihar.android.apg.intent.DECRYPT_AND_RETURN";
public static final String ENCRYPT_AND_RETURN = "org.thialfihar.android.apg.intent.ENCRYPT_AND_RETURN";
public static final String SELECT_PUBLIC_KEYS = "org.thialfihar.android.apg.intent.SELECT_PUBLIC_KEYS";
public static final String SELECT_SECRET_KEY = "org.thialfihar.android.apg.intent.SELECT_SECRET_KEY";
}
public static final String EXTRA_TEXT = "text";
public static final String EXTRA_DATA = "data";
public static final String EXTRA_ERROR = "error";
public static final String EXTRA_DECRYPTED_MESSAGE = "decryptedMessage";
public static final String EXTRA_ENCRYPTED_MESSAGE = "encryptedMessage";
public static final String EXTRA_SIGNATURE = "signature";
public static final String EXTRA_SIGNATURE_KEY_ID = "signatureKeyId";
public static final String EXTRA_SIGNATURE_USER_ID = "signatureUserId";
public static final String EXTRA_SIGNATURE_SUCCESS = "signatureSuccess";
public static final String EXTRA_SIGNATURE_UNKNOWN = "signatureUnknown";
public static final String EXTRA_USER_ID = "userId";
public static final String EXTRA_KEY_ID = "keyId";
public static final String EXTRA_ENCRYPTION_KEY_IDS = "encryptionKeyIds";
public static final String EXTRA_SELECTION = "selection";
public static final String EXTRA_MESSAGE = "message";
public static final String EXTRA_INTENT_VERSION = "intentVersion";
public static final String INTENT_VERSION = "1";
// Note: The support package only allows us to use the lower 16 bits of a request code.
public static final int DECRYPT_MESSAGE = 0x0000A001;
public static final int ENCRYPT_MESSAGE = 0x0000A002;
public static final int SELECT_PUBLIC_KEYS = 0x0000A003;
public static final int SELECT_SECRET_KEY = 0x0000A004;
public static Pattern PGP_MESSAGE =
Pattern.compile(".*?(-----BEGIN PGP MESSAGE-----.*?-----END PGP MESSAGE-----).*",
Pattern.DOTALL);
public static Pattern PGP_SIGNED_MESSAGE =
Pattern.compile(".*?(-----BEGIN PGP SIGNED MESSAGE-----.*?-----BEGIN PGP SIGNATURE-----.*?-----END PGP SIGNATURE-----).*",
Pattern.DOTALL);
public static Apg createInstance() {
return new Apg();
}
/**
* Check whether APG is installed and at a high enough version.
*
* @param context
* @return whether a suitable version of APG was found
*/
@Override
public boolean isAvailable(Context context) {
try {
PackageInfo pi = context.getPackageManager().getPackageInfo(mApgPackageName, 0);
if (pi.versionCode >= mMinRequiredVersion) {
return true;
} else {
Toast.makeText(context,
R.string.error_apg_version_not_supported, Toast.LENGTH_SHORT).show();
}
} catch (NameNotFoundException e) {
// not found
}
return false;
}
/**
* Select the signature key.
*
* @param activity
* @param pgpData
* @return success or failure
*/
@Override
public boolean selectSecretKey(Activity activity, PgpData pgpData) {
android.content.Intent intent = new android.content.Intent(Intent.SELECT_SECRET_KEY);
intent.putExtra(EXTRA_INTENT_VERSION, INTENT_VERSION);
try {
activity.startActivityForResult(intent, Apg.SELECT_SECRET_KEY);
return true;
} catch (ActivityNotFoundException e) {
Toast.makeText(activity,
R.string.error_activity_not_found,
Toast.LENGTH_SHORT).show();
return false;
}
}
/**
* Select encryption keys.
*
* @param activity
* @param emails The emails that should be used for preselection.
* @param pgpData
* @return success or failure
*/
@Override
public boolean selectEncryptionKeys(Activity activity, String emails, PgpData pgpData) {
android.content.Intent intent = new android.content.Intent(Apg.Intent.SELECT_PUBLIC_KEYS);
intent.putExtra(EXTRA_INTENT_VERSION, INTENT_VERSION);
long[] initialKeyIds = null;
if (!pgpData.hasEncryptionKeys()) {
List<Long> keyIds = new ArrayList<Long>();
if (pgpData.hasSignatureKey()) {
keyIds.add(pgpData.getSignatureKeyId());
}
try {
Uri contentUri = Uri.withAppendedPath(
Apg.CONTENT_URI_PUBLIC_KEY_RING_BY_EMAILS,
emails);
Cursor c = activity.getContentResolver().query(contentUri,
new String[] { "master_key_id" },
null, null, null);
if (c != null) {
while (c.moveToNext()) {
keyIds.add(c.getLong(0));
}
}
if (c != null) {
c.close();
}
} catch (SecurityException e) {
Toast.makeText(activity,
activity.getResources().getString(R.string.insufficient_apg_permissions),
Toast.LENGTH_LONG).show();
}
if (!keyIds.isEmpty()) {
initialKeyIds = new long[keyIds.size()];
for (int i = 0, size = keyIds.size(); i < size; ++i) {
initialKeyIds[i] = keyIds.get(i);
}
}
} else {
initialKeyIds = pgpData.getEncryptionKeys();
}
intent.putExtra(Apg.EXTRA_SELECTION, initialKeyIds);
try {
activity.startActivityForResult(intent, Apg.SELECT_PUBLIC_KEYS);
return true;
} catch (ActivityNotFoundException e) {
Toast.makeText(activity,
R.string.error_activity_not_found,
Toast.LENGTH_SHORT).show();
return false;
}
}
/**
* Get secret key ids based on a given email.
*
* @param context
* @param email The email in question.
* @return key ids
*/
@Override
public long[] getSecretKeyIdsFromEmail(Context context, String email) {
long ids[] = null;
try {
Uri contentUri = Uri.withAppendedPath(Apg.CONTENT_URI_SECRET_KEY_RING_BY_EMAILS,
email);
Cursor c = context.getContentResolver().query(contentUri,
new String[] { "master_key_id" },
null, null, null);
if (c != null && c.getCount() > 0) {
ids = new long[c.getCount()];
while (c.moveToNext()) {
ids[c.getPosition()] = c.getLong(0);
}
}
if (c != null) {
c.close();
}
} catch (SecurityException e) {
Toast.makeText(context,
context.getResources().getString(R.string.insufficient_apg_permissions),
Toast.LENGTH_LONG).show();
}
return ids;
}
/**
* Get public key ids based on a given email.
*
* @param context
* @param email The email in question.
* @return key ids
*/
@Override
public long[] getPublicKeyIdsFromEmail(Context context, String email) {
long ids[] = null;
try {
Uri contentUri = Uri.withAppendedPath(Apg.CONTENT_URI_PUBLIC_KEY_RING_BY_EMAILS, email);
Cursor c = context.getContentResolver().query(contentUri,
new String[] { "master_key_id" }, null, null, null);
if (c != null && c.getCount() > 0) {
ids = new long[c.getCount()];
while (c.moveToNext()) {
ids[c.getPosition()] = c.getLong(0);
}
}
if (c != null) {
c.close();
}
} catch (SecurityException e) {
Toast.makeText(context,
context.getResources().getString(R.string.insufficient_apg_permissions),
Toast.LENGTH_LONG).show();
}
return ids;
}
/**
* Find out if a given email has a secret key.
*
* @param context
* @param email The email in question.
* @return true if there is a secret key for this email.
*/
@Override
public boolean hasSecretKeyForEmail(Context context, String email) {
try {
Uri contentUri = Uri.withAppendedPath(Apg.CONTENT_URI_SECRET_KEY_RING_BY_EMAILS, email);
Cursor c = context.getContentResolver().query(contentUri,
new String[] { "master_key_id" }, null, null, null);
if (c != null && c.getCount() > 0) {
c.close();
return true;
}
if (c != null) {
c.close();
}
} catch (SecurityException e) {
Toast.makeText(context,
context.getResources().getString(R.string.insufficient_apg_permissions),
Toast.LENGTH_LONG).show();
}
return false;
}
/**
* Find out if a given email has a public key.
*
* @param context
* @param email The email in question.
* @return true if there is a public key for this email.
*/
@Override
public boolean hasPublicKeyForEmail(Context context, String email) {
try {
Uri contentUri = Uri.withAppendedPath(Apg.CONTENT_URI_PUBLIC_KEY_RING_BY_EMAILS, email);
Cursor c = context.getContentResolver().query(contentUri,
new String[] { "master_key_id" }, null, null, null);
if (c != null && c.getCount() > 0) {
c.close();
return true;
}
if (c != null) {
c.close();
}
} catch (SecurityException e) {
Toast.makeText(context,
context.getResources().getString(R.string.insufficient_apg_permissions),
Toast.LENGTH_LONG).show();
}
return false;
}
/**
* Get the user id based on the key id.
*
* @param context
* @param keyId
* @return user id
*/
@Override
public String getUserId(Context context, long keyId) {
String userId = null;
try {
Uri contentUri = ContentUris.withAppendedId(
Apg.CONTENT_URI_SECRET_KEY_RING_BY_KEY_ID,
keyId);
Cursor c = context.getContentResolver().query(contentUri,
new String[] { "user_id" },
null, null, null);
if (c != null && c.moveToFirst()) {
userId = c.getString(0);
}
if (c != null) {
c.close();
}
} catch (SecurityException e) {
Toast.makeText(context,
context.getResources().getString(R.string.insufficient_apg_permissions),
Toast.LENGTH_LONG).show();
}
if (userId == null) {
userId = context.getString(R.string.unknown_crypto_signature_user_id);
}
return userId;
}
/**
* Handle the activity results that concern us.
*
* @param activity
* @param requestCode
* @param resultCode
* @param data
* @return handled or not
*/
@Override
public boolean onActivityResult(Activity activity, int requestCode, int resultCode,
android.content.Intent data, PgpData pgpData) {
switch (requestCode) {
case Apg.SELECT_SECRET_KEY:
if (resultCode != Activity.RESULT_OK || data == null) {
break;
}
pgpData.setSignatureKeyId(data.getLongExtra(Apg.EXTRA_KEY_ID, 0));
pgpData.setSignatureUserId(data.getStringExtra(Apg.EXTRA_USER_ID));
((MessageCompose) activity).updateEncryptLayout();
break;
case Apg.SELECT_PUBLIC_KEYS:
if (resultCode != Activity.RESULT_OK || data == null) {
pgpData.setEncryptionKeys(null);
((MessageCompose) activity).onEncryptionKeySelectionDone();
break;
}
pgpData.setEncryptionKeys(data.getLongArrayExtra(Apg.EXTRA_SELECTION));
((MessageCompose) activity).onEncryptionKeySelectionDone();
break;
case Apg.ENCRYPT_MESSAGE:
if (resultCode != Activity.RESULT_OK || data == null) {
pgpData.setEncryptionKeys(null);
((MessageCompose) activity).onEncryptDone();
break;
}
pgpData.setEncryptedData(data.getStringExtra(Apg.EXTRA_ENCRYPTED_MESSAGE));
// this was a stupid bug in an earlier version, just gonna leave this in for an APG
// version or two
if (pgpData.getEncryptedData() == null) {
pgpData.setEncryptedData(data.getStringExtra(Apg.EXTRA_DECRYPTED_MESSAGE));
}
if (pgpData.getEncryptedData() != null) {
((MessageCompose) activity).onEncryptDone();
}
break;
default:
return false;
}
return true;
}
@Override
public boolean onDecryptActivityResult(CryptoDecryptCallback callback, int requestCode,
int resultCode, android.content.Intent data, PgpData pgpData) {
switch (requestCode) {
case Apg.DECRYPT_MESSAGE: {
if (resultCode != Activity.RESULT_OK || data == null) {
break;
}
pgpData.setSignatureUserId(data.getStringExtra(Apg.EXTRA_SIGNATURE_USER_ID));
pgpData.setSignatureKeyId(data.getLongExtra(Apg.EXTRA_SIGNATURE_KEY_ID, 0));
pgpData.setSignatureSuccess(data.getBooleanExtra(Apg.EXTRA_SIGNATURE_SUCCESS, false));
pgpData.setSignatureUnknown(data.getBooleanExtra(Apg.EXTRA_SIGNATURE_UNKNOWN, false));
pgpData.setDecryptedData(data.getStringExtra(Apg.EXTRA_DECRYPTED_MESSAGE));
callback.onDecryptDone(pgpData);
break;
}
default: {
return false;
}
}
return true;
}
/**
* Start the encrypt activity.
*
* @param activity
* @param data
* @param pgpData
* @return success or failure
*/
@Override
public boolean encrypt(Activity activity, String data, PgpData pgpData) {
android.content.Intent intent = new android.content.Intent(Intent.ENCRYPT_AND_RETURN);
intent.putExtra(EXTRA_INTENT_VERSION, INTENT_VERSION);
intent.setType("text/plain");
intent.putExtra(Apg.EXTRA_TEXT, data);
intent.putExtra(Apg.EXTRA_ENCRYPTION_KEY_IDS, pgpData.getEncryptionKeys());
intent.putExtra(Apg.EXTRA_SIGNATURE_KEY_ID, pgpData.getSignatureKeyId());
try {
activity.startActivityForResult(intent, Apg.ENCRYPT_MESSAGE);
return true;
} catch (ActivityNotFoundException e) {
Toast.makeText(activity,
R.string.error_activity_not_found,
Toast.LENGTH_SHORT).show();
return false;
}
}
/**
* Start the decrypt activity.
*
* @param fragment
* @param data
* @param pgpData
* @return success or failure
*/
@Override
public boolean decrypt(Fragment fragment, String data, PgpData pgpData) {
android.content.Intent intent = new android.content.Intent(Apg.Intent.DECRYPT_AND_RETURN);
intent.putExtra(EXTRA_INTENT_VERSION, INTENT_VERSION);
intent.setType("text/plain");
if (data == null) {
return false;
}
try {
intent.putExtra(EXTRA_TEXT, data);
fragment.startActivityForResult(intent, Apg.DECRYPT_MESSAGE);
return true;
} catch (ActivityNotFoundException e) {
Toast.makeText(fragment.getActivity(), R.string.error_activity_not_found, Toast.LENGTH_SHORT).show();
return false;
}
}
@Override
public boolean isEncrypted(Message message) {
String data = null;
try {
Part part = MimeUtility.findFirstPartByMimeType(message, "text/plain");
if (part == null) {
part = MimeUtility.findFirstPartByMimeType(message, "text/html");
}
if (part != null) {
data = MimeUtility.getTextFromPart(part);
}
} catch (MessagingException e) {
// guess not...
// TODO: maybe log this?
}
if (data == null) {
return false;
}
Matcher matcher = PGP_MESSAGE.matcher(data);
return matcher.matches();
}
@Override
public boolean isSigned(Message message) {
String data = null;
try {
Part part = MimeUtility.findFirstPartByMimeType(message, "text/plain");
if (part == null) {
part = MimeUtility.findFirstPartByMimeType(message, "text/html");
}
if (part != null) {
data = MimeUtility.getTextFromPart(part);
}
} catch (MessagingException e) {
// guess not...
// TODO: maybe log this?
}
if (data == null) {
return false;
}
Matcher matcher = PGP_SIGNED_MESSAGE.matcher(data);
return matcher.matches();
}
/**
* Get the name of the provider.
*
* @return provider name
*/
@Override
public String getName() {
return NAME;
}
/**
* Test the APG installation.
*
* @return success or failure
*/
@Override
public boolean test(Context context) {
if (!isAvailable(context)) {
return false;
}
try {
// try out one content provider to check permissions
Uri contentUri = ContentUris.withAppendedId(
Apg.CONTENT_URI_SECRET_KEY_RING_BY_KEY_ID,
12345);
Cursor c = context.getContentResolver().query(contentUri,
new String[] { "user_id" },
null, null, null);
if (c != null) {
c.close();
}
} catch (SecurityException e) {
// if there was a problem, then let the user know, this will not stop K9/APG from
// working, but some features won't be available, so we can still return "true"
Toast.makeText(context,
context.getResources().getString(R.string.insufficient_apg_permissions),
Toast.LENGTH_LONG).show();
}
return true;
}
}
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