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Code Issues Releases Wiki Activity

NFC Yubikey: only pass through hash of message and not whole content

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This commit is contained in:
Dominik Schürmann 2014-07-21 15:10:29 +02:00
parent a10f582513
commit d882572f0d
7 changed files with 121 additions and 55 deletions
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2
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyHelper.java
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@ -95,7 +95,7 @@ public class PgpKeyHelper {
}
/**
* Converts fingerprint to hex (optional: with whitespaces after 4 characters)
* Converts fingerprint to hex
* <p/>
* Fingerprint is shown using lowercase characters. Studies have shown that humans can
* better differentiate between numbers and letters when letters are lowercase.

76
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpSignEncrypt.java
View File

@ -18,6 +18,7 @@
package org.sufficientlysecure.keychain.pgp;
import org.openkeychain.nfc.NfcHandler;
import org.spongycastle.bcpg.ArmoredOutputStream;
import org.spongycastle.bcpg.BCPGOutputStream;
import org.spongycastle.bcpg.S2K;
@ -30,6 +31,7 @@ import org.spongycastle.openpgp.PGPSignatureGenerator;
import org.spongycastle.openpgp.PGPV3SignatureGenerator;
import org.spongycastle.openpgp.operator.jcajce.JcePBEKeyEncryptionMethodGenerator;
import org.spongycastle.openpgp.operator.jcajce.JcePGPDataEncryptorBuilder;
import org.spongycastle.openpgp.operator.jcajce.NfcSyncPGPContentSignerBuilder;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException;
@ -49,8 +51,10 @@ import java.nio.charset.Charset;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SignatureException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.LinkedList;
/**
* This class uses a Builder pattern!
@ -73,7 +77,7 @@ public class PgpSignEncrypt {
private String mSignaturePassphrase;
private boolean mEncryptToSigner;
private boolean mCleartextInput;
private String mNfcData;
private byte[] mNfcData;
private static byte[] NEW_LINE;
@ -127,7 +131,7 @@ public class PgpSignEncrypt {
private String mSignaturePassphrase = null;
private boolean mEncryptToSigner = false;
private boolean mCleartextInput = false;
private String mNfcData = null;
private byte[] mNfcData = null;
public Builder(ProviderHelper providerHelper, String versionHeader, InputData data, OutputStream outStream) {
this.mProviderHelper = providerHelper;
@ -212,7 +216,7 @@ public class PgpSignEncrypt {
return this;
}
public Builder setNfcData(String nfcData) {
public Builder setNfcData(byte[] nfcData) {
mNfcData = nfcData;
return this;
}
@ -244,15 +248,20 @@ public class PgpSignEncrypt {
}
}
public static class WrongPassphraseException extends Exception {
public WrongPassphraseException() {
}
}
public static class NoSigningKeyException extends Exception {
public NoSigningKeyException() {
}
}
public static class NeedNfcDataException extends Exception {
public String mData;
public byte[] mData;
public NeedNfcDataException(String data) {
public NeedNfcDataException(byte[] data) {
mData = data;
}
}
@ -268,7 +277,7 @@ public class PgpSignEncrypt {
*/
public void execute()
throws IOException, PGPException, NoSuchProviderException,
NoSuchAlgorithmException, SignatureException, KeyExtractionException, NoSigningKeyException, NoPassphraseException, NeedNfcDataException {
NoSuchAlgorithmException, SignatureException, KeyExtractionException, NoSigningKeyException, NoPassphraseException, NeedNfcDataException, WrongPassphraseException {
boolean enableSignature = mSignatureMasterKeyId != Constants.key.none;
boolean enableEncryption = ((mEncryptionMasterKeyIds != null && mEncryptionMasterKeyIds.length > 0)
@ -308,10 +317,19 @@ public class PgpSignEncrypt {
updateProgress(R.string.progress_extracting_signature_key, 0, 100);
try {
signingKey.unlock(mSignaturePassphrase);
if (!signingKey.unlock(mSignaturePassphrase)) {
throw new WrongPassphraseException();
}
} catch (PgpGeneralException e) {
throw new KeyExtractionException();
}
// check if hash algo is supported
LinkedList<Integer> supported = signingKey.getSupportedHashAlgorithms();
if (!supported.contains(mSignatureHashAlgorithm)) {
// get most preferred
mSignatureHashAlgorithm = supported.getLast();
}
}
updateProgress(R.string.progress_preparing_streams, 5, 100);
@ -350,17 +368,10 @@ public class PgpSignEncrypt {
}
}
// HACK
boolean useNfc = false;
if (signingKey.getSecretKey().getS2K().getType() == S2K.GNU_DUMMY_S2K
&& signingKey.getSecretKey().getS2K().getProtectionMode() == 2) {
useNfc = true;
}
/* Initialize signature generator object for later usage */
PGPSignatureGenerator signatureGenerator = null;
PGPV3SignatureGenerator signatureV3Generator = null;
if (enableSignature && !useNfc) {
if (enableSignature) {
updateProgress(R.string.progress_preparing_signature, 10, 100);
try {
@ -370,21 +381,17 @@ public class PgpSignEncrypt {
mSignatureHashAlgorithm, cleartext);
} else {
signatureGenerator = signingKey.getSignatureGenerator(
mSignatureHashAlgorithm, cleartext);
mSignatureHashAlgorithm, cleartext, mNfcData);
}
} catch (PgpGeneralException e) {
// TODO throw correct type of exception (which shouldn't be PGPException)
throw new KeyExtractionException();
}
}
// else if (enableSignature && useNfc) {
//
// }
ArmoredOutputStream armorOut = null;
OutputStream out = null;
if (mEnableAsciiArmorOutput && !useNfc) {
OutputStream out;
if (mEnableAsciiArmorOutput) {
armorOut = new ArmoredOutputStream(mOutStream);
armorOut.setHeader("Version", mVersionHeader);
out = armorOut;
@ -397,19 +404,7 @@ public class PgpSignEncrypt {
OutputStream encryptionOut = null;
BCPGOutputStream bcpgOut;
// Barrier function!
if (useNfc && mNfcData == null) {
Log.d(Constants.TAG, "mNfcData is null");
String nfcData = convertStreamToString(mData.getInputStream());
Log.d(Constants.TAG, "nfcData: " + nfcData);
throw new NeedNfcDataException(nfcData);
}
if (useNfc) {
Log.d(Constants.TAG, "mNfcData: " + mNfcData);
out.write(mNfcData.getBytes());
out.flush();
} else if (enableEncryption) {
if (enableEncryption) {
/* actual encryption */
encryptionOut = cPk.open(out, new byte[1 << 16]);
@ -543,12 +538,17 @@ public class PgpSignEncrypt {
Log.e(Constants.TAG, "not supported!");
}
if (enableSignature && !useNfc) {
if (enableSignature) {
updateProgress(R.string.progress_generating_signature, 95, 100);
if (mSignatureForceV3) {
signatureV3Generator.generate().encode(pOut);
} else {
signatureGenerator.generate().encode(pOut);
try {
signatureGenerator.generate().encode(pOut);
} catch (NfcSyncPGPContentSignerBuilder.NfcInteractionNeeded e) {
// this secret key diverts to a OpenPGP card, throw exception with to-be-signed hash
throw new NeedNfcDataException(e.hashToSign);
}
}
}
@ -562,7 +562,7 @@ public class PgpSignEncrypt {
encryptionOut.close();
}
if (mEnableAsciiArmorOutput && !useNfc) {
if (mEnableAsciiArmorOutput) {
armorOut.close();
}

5
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/UncachedKeyRing.java
View File

@ -176,8 +176,9 @@ public class UncachedKeyRing {
for (PGPSecretKey sub : new IterableIterator<PGPSecretKey>(
((PGPSecretKeyRing) mRing).getSecretKeys())) {
S2K s2k = sub.getS2K();
// Set to 1, except if the encryption type is GNU_DUMMY_S2K
if(s2k == null || s2k.getType() != S2K.GNU_DUMMY_S2K) {
// add key, except if the private key has been stripped (GNU extension)
if(s2k == null || (s2k.getType() == S2K.GNU_DUMMY_S2K
&& s2k.getProtectionMode() != S2K.GNU_PROTECTION_MODE_NO_PRIVATE_KEY)) {
result.add(sub.getKeyID());
} else {
Log.d(Constants.TAG, "S2K GNU extension!, mode: " + s2k.getProtectionMode());

79
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/WrappedSecretKey.java
View File

@ -1,5 +1,8 @@
package org.sufficientlysecure.keychain.pgp;
import org.spongycastle.bcpg.HashAlgorithmTags;
import org.spongycastle.bcpg.PublicKeyAlgorithmTags;
import org.spongycastle.bcpg.S2K;
import org.spongycastle.openpgp.PGPException;
import org.spongycastle.openpgp.PGPPrivateKey;
import org.spongycastle.openpgp.PGPPublicKey;
@ -12,19 +15,26 @@ import org.spongycastle.openpgp.PGPSignatureSubpacketVector;
import org.spongycastle.openpgp.PGPUtil;
import org.spongycastle.openpgp.PGPV3SignatureGenerator;
import org.spongycastle.openpgp.operator.PBESecretKeyDecryptor;
import org.spongycastle.openpgp.operator.PGPContentSignerBuilder;
import org.spongycastle.openpgp.operator.PublicKeyDataDecryptorFactory;
import org.spongycastle.openpgp.operator.jcajce.JcaPGPContentSignerBuilder;
import org.spongycastle.openpgp.operator.jcajce.JcePBESecretKeyDecryptorBuilder;
import org.spongycastle.openpgp.operator.jcajce.JcePublicKeyDataDecryptorFactoryBuilder;
import org.spongycastle.openpgp.operator.jcajce.NfcSyncPGPContentSignerBuilder;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException;
import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralMsgIdException;
import org.sufficientlysecure.keychain.util.IterableIterator;
import org.sufficientlysecure.keychain.util.Log;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SignatureException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
/** Wrapper for a PGPSecretKey.
*
@ -42,6 +52,11 @@ public class WrappedSecretKey extends WrappedPublicKey {
private final PGPSecretKey mSecretKey;
private PGPPrivateKey mPrivateKey = null;
private int mPrivateKeyState = PRIVATE_KEY_STATE_LOCKED;
private static int PRIVATE_KEY_STATE_LOCKED = 0;
private static int PRIVATE_KEY_STATE_UNLOCKED = 1;
private static int PRIVATE_KEY_STATE_DIVERT_TO_CARD = 2;
WrappedSecretKey(WrappedSecretKeyRing ring, PGPSecretKey key) {
super(ring, key.getPublicKey());
mSecretKey = key;
@ -59,11 +74,23 @@ public class WrappedSecretKey extends WrappedPublicKey {
return mSecretKey;
}
/**
* Returns true on right passphrase
*/
public boolean unlock(String passphrase) throws PgpGeneralException {
// handle keys on OpenPGP cards like they were unlocked
if (mSecretKey.getS2K().getType() == S2K.GNU_DUMMY_S2K
&& mSecretKey.getS2K().getProtectionMode() == S2K.GNU_PROTECTION_MODE_DIVERT_TO_CARD) {
mPrivateKeyState = PRIVATE_KEY_STATE_DIVERT_TO_CARD;
return true;
}
// try to extract keys using the passphrase
try {
PBESecretKeyDecryptor keyDecryptor = new JcePBESecretKeyDecryptorBuilder().setProvider(
Constants.BOUNCY_CASTLE_PROVIDER_NAME).build(passphrase.toCharArray());
mPrivateKey = mSecretKey.extractPrivateKey(keyDecryptor);
mPrivateKeyState = PRIVATE_KEY_STATE_UNLOCKED;
} catch (PGPException e) {
return false;
}
@ -73,16 +100,46 @@ public class WrappedSecretKey extends WrappedPublicKey {
return true;
}
public PGPSignatureGenerator getSignatureGenerator(int hashAlgo, boolean cleartext)
// TODO: just a hack currently
public LinkedList<Integer> getSupportedHashAlgorithms() {
LinkedList<Integer> supported = new LinkedList<Integer>();
if (mPrivateKeyState == PRIVATE_KEY_STATE_DIVERT_TO_CARD) {
// TODO: only works with SHA256 ?!
supported.add(HashAlgorithmTags.SHA256);
} else {
supported.add(HashAlgorithmTags.MD5);
supported.add(HashAlgorithmTags.RIPEMD160);
supported.add(HashAlgorithmTags.SHA1);
supported.add(HashAlgorithmTags.SHA224);
supported.add(HashAlgorithmTags.SHA256);
supported.add(HashAlgorithmTags.SHA384);
supported.add(HashAlgorithmTags.SHA512); // preferred is latest
}
return supported;
}
public PGPSignatureGenerator getSignatureGenerator(int hashAlgo, boolean cleartext,
byte[] nfcSignedHash)
throws PgpGeneralException {
if(mPrivateKey == null) {
if (mPrivateKeyState == PRIVATE_KEY_STATE_LOCKED) {
throw new PrivateKeyNotUnlockedException();
}
// content signer based on signing key algorithm and chosen hash algorithm
JcaPGPContentSignerBuilder contentSignerBuilder = new JcaPGPContentSignerBuilder(
mSecretKey.getPublicKey().getAlgorithm(), hashAlgo)
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
PGPContentSignerBuilder contentSignerBuilder;
if (mPrivateKeyState == PRIVATE_KEY_STATE_DIVERT_TO_CARD) {
// use synchronous "NFC based" SignerBuilder
contentSignerBuilder = new NfcSyncPGPContentSignerBuilder(
mSecretKey.getPublicKey().getAlgorithm(), hashAlgo,
mSecretKey.getKeyID(), nfcSignedHash)
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
} else {
// content signer based on signing key algorithm and chosen hash algorithm
contentSignerBuilder = new JcaPGPContentSignerBuilder(
mSecretKey.getPublicKey().getAlgorithm(), hashAlgo)
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
}
int signatureType;
if (cleartext) {
@ -101,13 +158,15 @@ public class WrappedSecretKey extends WrappedPublicKey {
signatureGenerator.setHashedSubpackets(spGen.generate());
return signatureGenerator;
} catch(PGPException e) {
// TODO: simply throw PGPException!
throw new PgpGeneralException("Error initializing signature!", e);
}
}
public PGPV3SignatureGenerator getV3SignatureGenerator(int hashAlgo, boolean cleartext)
throws PgpGeneralException {
if(mPrivateKey == null) {
// TODO: divert to card missing
if (mPrivateKeyState != PRIVATE_KEY_STATE_UNLOCKED) {
throw new PrivateKeyNotUnlockedException();
}
@ -134,7 +193,8 @@ public class WrappedSecretKey extends WrappedPublicKey {
}
public PublicKeyDataDecryptorFactory getDecryptorFactory() {
if(mPrivateKey == null) {
// TODO: divert to card missing
if (mPrivateKeyState != PRIVATE_KEY_STATE_UNLOCKED) {
throw new PrivateKeyNotUnlockedException();
}
return new JcePublicKeyDataDecryptorFactoryBuilder()
@ -152,7 +212,8 @@ public class WrappedSecretKey extends WrappedPublicKey {
throws PgpGeneralMsgIdException, NoSuchAlgorithmException, NoSuchProviderException,
PGPException, SignatureException {
if(mPrivateKey == null) {
// TODO: divert to card missing
if (mPrivateKeyState != PRIVATE_KEY_STATE_UNLOCKED) {
throw new PrivateKeyNotUnlockedException();
}

10
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/OpenPgpService.java
View File

@ -136,10 +136,10 @@ public class OpenPgpService extends RemoteService {
return result;
}
private Intent getNfcIntent(Intent data, String in) {
private Intent getNfcIntent(Intent data, byte[] in) {
// build PendingIntent for Yubikey NFC operations
Intent intent = new Intent(getBaseContext(), NfcActivity.class);
intent.setAction(NfcActivity.ACTION_SIGN);
intent.setAction(NfcActivity.ACTION_SIGN_HASH);
intent.putExtra(NfcActivity.EXTRA_NFC_DATA, in);
intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
// pass params through to activity that it can be returned again later to repeat pgp operation
@ -191,7 +191,7 @@ public class OpenPgpService extends RemoteService {
return passphraseBundle;
}
String nfcData = data.getStringExtra(OpenPgpApi.EXTRA_NFC_DATA);
byte[] nfcData = data.getByteArrayExtra(OpenPgpApi.EXTRA_NFC_DATA);
// Get Input- and OutputStream from ParcelFileDescriptor
InputStream is = new ParcelFileDescriptor.AutoCloseInputStream(input);
@ -223,6 +223,8 @@ public class OpenPgpService extends RemoteService {
throw new Exception(getString(R.string.error_could_not_extract_private_key));
} catch (PgpSignEncrypt.NoPassphraseException e) {
throw new Exception(getString(R.string.error_no_signature_passphrase));
} catch (PgpSignEncrypt.WrongPassphraseException e) {
throw new Exception(getString(R.string.error_wrong_passphrase));
} catch (PgpSignEncrypt.NoSigningKeyException e) {
throw new Exception(getString(R.string.error_no_signature_key));
} catch (PgpSignEncrypt.NeedNfcDataException e) {
@ -333,6 +335,8 @@ public class OpenPgpService extends RemoteService {
throw new Exception(getString(R.string.error_could_not_extract_private_key));
} catch (PgpSignEncrypt.NoPassphraseException e) {
throw new Exception(getString(R.string.error_no_signature_passphrase));
} catch (PgpSignEncrypt.WrongPassphraseException e) {
throw new Exception(getString(R.string.error_wrong_passphrase));
} catch (PgpSignEncrypt.NoSigningKeyException e) {
throw new Exception(getString(R.string.error_no_signature_key));
}

2
extern/openpgp-card-nfc-lib vendored

@ -1 +1 @@
Subproject commit d05ad01970f4f08cc747bc1c44a99255d2796c7f
Subproject commit 35cd39bb46f2749d55fe327862826e4bdfe38f51

2
extern/spongycastle vendored

@ -1 +1 @@
Subproject commit 968405ee5d4272330cffdf75f7eee4cd9f5c8646
Subproject commit a68ebd1ffc5af880903b2905c17e4f6ac0f13988