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Code Issues Releases Wiki Activity

verify downloaded key by comparing fingerprints

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This commit is contained in:
Dominik Schürmann 2014-03-20 19:11:51 +01:00
parent 77365202e0
commit 0510e0e217
1 changed files with 42 additions and 32 deletions
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56
OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/service/KeychainIntentService.java
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@ -25,6 +25,7 @@ import android.os.Bundle;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import org.spongycastle.openpgp.*;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.Id;
@ -745,49 +746,58 @@ public class KeychainIntentService extends IntentService
ArrayList<ImportKeysListEntry> entries = data.getParcelableArrayList(DOWNLOAD_KEY_LIST);
String keyServer = data.getString(DOWNLOAD_KEY_SERVER);
// TODO: add extra which requires fingerprint suport and force verification!
// only supported by newer sks keyserver versions
// this downloads the keys and places them into the ImportKeysListEntry entries
HkpKeyServer server = new HkpKeyServer(keyServer);
for (ImportKeysListEntry entry : entries) {
byte[] downloadedKey = server.get(entry.getKeyIdHex()).getBytes();
// if available use complete fingerprint for get request
byte[] downloadedKeyBytes;
if (entry.getFingerPrintHex() != null) {
downloadedKeyBytes = server.get(entry.getFingerPrintHex()).getBytes();
} else {
downloadedKeyBytes = server.get(entry.getKeyIdHex()).getBytes();
}
/**
* TODO: copied from ImportKeysListLoader
*
*
* this parses the downloaded key
*/
// need to have access to the bufferedInput, so we can reuse it for the possible
// PGPObject chunks after the first one, e.g. files with several consecutive ASCII
// armor blocks
// create PGPKeyRing object based on downloaded armored key
PGPKeyRing downloadedKey = null;
BufferedInputStream bufferedInput =
new BufferedInputStream(new ByteArrayInputStream(downloadedKey));
try {
// read all available blocks... (asc files can contain many blocks with BEGIN END)
while (bufferedInput.available() > 0) {
new BufferedInputStream(new ByteArrayInputStream(downloadedKeyBytes));
if (bufferedInput.available() > 0) {
InputStream in = PGPUtil.getDecoderStream(bufferedInput);
PGPObjectFactory objectFactory = new PGPObjectFactory(in);
// go through all objects in this block
// get first object in block
Object obj;
while ((obj = objectFactory.nextObject()) != null) {
if ((obj = objectFactory.nextObject()) != null) {
Log.d(Constants.TAG, "Found class: " + obj.getClass());
if (obj instanceof PGPKeyRing) {
PGPKeyRing newKeyring = (PGPKeyRing) obj;
entry.setBytes(newKeyring.getEncoded());
downloadedKey = (PGPKeyRing) obj;
} else {
Log.e(Constants.TAG, "Object not recognized as PGPKeyRing!");
throw new PgpGeneralException("Object not recognized as PGPKeyRing!");
}
}
}
} catch (Exception e) {
Log.e(Constants.TAG, "Exception on parsing key file!", e);
// verify downloaded key by comparing fingerprints
if (entry.getFingerPrintHex() != null) {
String downloadedKeyFp = PgpKeyHelper.convertFingerprintToHex(downloadedKey.getPublicKey().getFingerprint(), false);
if (downloadedKeyFp.equals(entry.getFingerPrintHex())) {
Log.d(Constants.TAG, "fingerprint of downloaded key is the same as the requested fingerprint!");
} else {
throw new PgpGeneralException("fingerprint of downloaded key is NOT the same as the requested fingerprint!");
}
}
// save key bytes in entry object for doing the
// actual import afterwards
entry.setBytes(downloadedKey.getEncoded());
}
Intent importIntent = new Intent(this, KeychainIntentService.class);
importIntent.setAction(ACTION_IMPORT_KEYRING);
Bundle importData = new Bundle();