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|
/*
* Copyright (C) 2012-2014 Dominik Schürmann <dominik@dominikschuermann.de>
* Copyright (C) 2010-2014 Thialfihar <thi@thialfihar.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sufficientlysecure.keychain.pgp;
import org.spongycastle.bcpg.CompressionAlgorithmTags;
import org.spongycastle.bcpg.HashAlgorithmTags;
import org.spongycastle.bcpg.PublicKeyAlgorithmTags;
import org.spongycastle.bcpg.SymmetricKeyAlgorithmTags;
import org.spongycastle.bcpg.sig.Features;
import org.spongycastle.bcpg.sig.KeyFlags;
import org.spongycastle.jce.spec.ElGamalParameterSpec;
import org.spongycastle.openpgp.PGPException;
import org.spongycastle.openpgp.PGPKeyPair;
import org.spongycastle.openpgp.PGPPrivateKey;
import org.spongycastle.openpgp.PGPPublicKey;
import org.spongycastle.openpgp.PGPSecretKey;
import org.spongycastle.openpgp.PGPSecretKeyRing;
import org.spongycastle.openpgp.PGPSignature;
import org.spongycastle.openpgp.PGPSignatureGenerator;
import org.spongycastle.openpgp.PGPSignatureSubpacketGenerator;
import org.spongycastle.openpgp.operator.PBESecretKeyDecryptor;
import org.spongycastle.openpgp.operator.PBESecretKeyEncryptor;
import org.spongycastle.openpgp.operator.PGPContentSignerBuilder;
import org.spongycastle.openpgp.operator.PGPDigestCalculator;
import org.spongycastle.openpgp.operator.jcajce.JcaKeyFingerprintCalculator;
import org.spongycastle.openpgp.operator.jcajce.JcaPGPContentSignerBuilder;
import org.spongycastle.openpgp.operator.jcajce.JcaPGPDigestCalculatorProviderBuilder;
import org.spongycastle.openpgp.operator.jcajce.JcaPGPKeyPair;
import org.spongycastle.openpgp.operator.jcajce.JcePBESecretKeyDecryptorBuilder;
import org.spongycastle.openpgp.operator.jcajce.JcePBESecretKeyEncryptorBuilder;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.service.OperationResultParcel;
import org.sufficientlysecure.keychain.service.OperationResultParcel.LogLevel;
import org.sufficientlysecure.keychain.service.OperationResultParcel.LogType;
import org.sufficientlysecure.keychain.service.OperationResultParcel.OperationLog;
import org.sufficientlysecure.keychain.service.OperationResults.EditKeyResult;
import org.sufficientlysecure.keychain.service.SaveKeyringParcel;
import org.sufficientlysecure.keychain.service.SaveKeyringParcel.SubkeyAdd;
import org.sufficientlysecure.keychain.util.IterableIterator;
import org.sufficientlysecure.keychain.util.Log;
import org.sufficientlysecure.keychain.util.Primes;
import org.sufficientlysecure.keychain.util.ProgressScaler;
import java.io.IOException;
import java.math.BigInteger;
import java.security.InvalidAlgorithmParameterException;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.SignatureException;
import java.util.Arrays;
import java.util.Date;
import java.util.Iterator;
import java.util.Stack;
/**
* This class is the single place where ALL operations that actually modify a PGP public or secret
* key take place.
* <p/>
* Note that no android specific stuff should be done here, ie no imports from com.android.
* <p/>
* All operations support progress reporting to a Progressable passed on initialization.
* This indicator may be null.
*/
public class PgpKeyOperation {
private Stack<Progressable> mProgress;
// most preferred is first
private static final int[] PREFERRED_SYMMETRIC_ALGORITHMS = new int[]{
SymmetricKeyAlgorithmTags.AES_256,
SymmetricKeyAlgorithmTags.AES_192,
SymmetricKeyAlgorithmTags.AES_128,
SymmetricKeyAlgorithmTags.CAST5
};
private static final int[] PREFERRED_HASH_ALGORITHMS = new int[]{
HashAlgorithmTags.SHA512,
HashAlgorithmTags.SHA384,
HashAlgorithmTags.SHA224,
HashAlgorithmTags.SHA256,
HashAlgorithmTags.RIPEMD160
};
private static final int[] PREFERRED_COMPRESSION_ALGORITHMS = new int[]{
CompressionAlgorithmTags.ZLIB,
CompressionAlgorithmTags.BZIP2,
CompressionAlgorithmTags.ZIP
};
/*
* Note: s2kcount is a number between 0 and 0xff that controls the
* number of times to iterate the password hash before use. More
* iterations are useful against offline attacks, as it takes more
* time to check each password. The actual number of iterations is
* rather complex, and also depends on the hash function in use.
* Refer to Section 3.7.1.3 in rfc4880.txt. Bigger numbers give
* you more iterations. As a rough rule of thumb, when using
* SHA256 as the hashing function, 0x10 gives you about 64
* iterations, 0x20 about 128, 0x30 about 256 and so on till 0xf0,
* or about 1 million iterations. The maximum you can go to is
* 0xff, or about 2 million iterations. I'll use 0xc0 as a
* default -- about 130,000 iterations.
*
* http://kbsriram.com/2013/01/generating-rsa-keys-with-bouncycastle.html
*/
private static final int SECRET_KEY_ENCRYPTOR_HASH_ALGO = HashAlgorithmTags.SHA512;
private static final int SECRET_KEY_ENCRYPTOR_SYMMETRIC_ALGO = SymmetricKeyAlgorithmTags.AES_256;
private static final int SECRET_KEY_ENCRYPTOR_S2K_COUNT = 0x60;
public PgpKeyOperation(Progressable progress) {
super();
if (progress != null) {
mProgress = new Stack<Progressable>();
mProgress.push(progress);
}
}
private void subProgressPush(int from, int to) {
if (mProgress == null) {
return;
}
mProgress.push(new ProgressScaler(mProgress.peek(), from, to, 100));
}
private void subProgressPop() {
if (mProgress == null) {
return;
}
if (mProgress.size() == 1) {
throw new RuntimeException("Tried to pop progressable without prior push! "
+ "This is a programming error, please file a bug report.");
}
mProgress.pop();
}
private void progress(int message, int current) {
if (mProgress == null) {
return;
}
mProgress.peek().setProgress(message, current, 100);
}
/** Creates new secret key. */
private PGPKeyPair createKey(int algorithmChoice, int keySize, OperationLog log, int indent) {
try {
if (keySize < 512) {
log.add(LogLevel.ERROR, LogType.MSG_CR_ERROR_KEYSIZE_512, indent);
return null;
}
int algorithm;
KeyPairGenerator keyGen;
switch (algorithmChoice) {
case PublicKeyAlgorithmTags.DSA: {
progress(R.string.progress_generating_dsa, 30);
keyGen = KeyPairGenerator.getInstance("DSA", Constants.BOUNCY_CASTLE_PROVIDER_NAME);
keyGen.initialize(keySize, new SecureRandom());
algorithm = PGPPublicKey.DSA;
break;
}
case PublicKeyAlgorithmTags.ELGAMAL_ENCRYPT: {
progress(R.string.progress_generating_elgamal, 30);
keyGen = KeyPairGenerator.getInstance("ElGamal", Constants.BOUNCY_CASTLE_PROVIDER_NAME);
BigInteger p = Primes.getBestPrime(keySize);
BigInteger g = new BigInteger("2");
ElGamalParameterSpec elParams = new ElGamalParameterSpec(p, g);
keyGen.initialize(elParams);
algorithm = PGPPublicKey.ELGAMAL_ENCRYPT;
break;
}
case PublicKeyAlgorithmTags.RSA_GENERAL: {
progress(R.string.progress_generating_rsa, 30);
keyGen = KeyPairGenerator.getInstance("RSA", Constants.BOUNCY_CASTLE_PROVIDER_NAME);
keyGen.initialize(keySize, new SecureRandom());
algorithm = PGPPublicKey.RSA_GENERAL;
break;
}
default: {
log.add(LogLevel.ERROR, LogType.MSG_CR_ERROR_UNKNOWN_ALGO, indent);
return null;
}
}
// build new key pair
return new JcaPGPKeyPair(algorithm, keyGen.generateKeyPair(), new Date());
} catch(NoSuchProviderException e) {
throw new RuntimeException(e);
} catch(NoSuchAlgorithmException e) {
throw new RuntimeException(e);
} catch(InvalidAlgorithmParameterException e) {
throw new RuntimeException(e);
} catch(PGPException e) {
Log.e(Constants.TAG, "internal pgp error", e);
log.add(LogLevel.ERROR, LogType.MSG_CR_ERROR_INTERNAL_PGP, indent);
return null;
}
}
public EditKeyResult createSecretKeyRing(SaveKeyringParcel saveParcel) {
OperationLog log = new OperationLog();
int indent = 0;
try {
log.add(LogLevel.START, LogType.MSG_CR, indent);
progress(R.string.progress_building_key, 0);
indent += 1;
if (saveParcel.mAddSubKeys.isEmpty()) {
log.add(LogLevel.ERROR, LogType.MSG_CR_ERROR_NO_MASTER, indent);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
if (saveParcel.mAddUserIds.isEmpty()) {
log.add(LogLevel.ERROR, LogType.MSG_CR_ERROR_NO_USER_ID, indent);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
SubkeyAdd add = saveParcel.mAddSubKeys.remove(0);
if ((add.mFlags & KeyFlags.CERTIFY_OTHER) != KeyFlags.CERTIFY_OTHER) {
log.add(LogLevel.ERROR, LogType.MSG_CR_ERROR_NO_CERTIFY, indent);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
if (add.mExpiry == null) {
log.add(LogLevel.ERROR, LogType.MSG_CR_ERROR_NULL_EXPIRY, indent);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
if (add.mAlgorithm == PublicKeyAlgorithmTags.ELGAMAL_ENCRYPT) {
log.add(LogLevel.ERROR, LogType.MSG_CR_ERROR_MASTER_ELGAMAL, indent);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
subProgressPush(10, 30);
PGPKeyPair keyPair = createKey(add.mAlgorithm, add.mKeysize, log, indent);
subProgressPop();
// return null if this failed (an error will already have been logged by createKey)
if (keyPair == null) {
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
progress(R.string.progress_building_master_key, 40);
// Build key encrypter and decrypter based on passphrase
PGPDigestCalculator encryptorHashCalc = new JcaPGPDigestCalculatorProviderBuilder()
.build().get(SECRET_KEY_ENCRYPTOR_HASH_ALGO);
PBESecretKeyEncryptor keyEncryptor = new JcePBESecretKeyEncryptorBuilder(
SECRET_KEY_ENCRYPTOR_SYMMETRIC_ALGO, encryptorHashCalc, SECRET_KEY_ENCRYPTOR_S2K_COUNT)
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME).build("".toCharArray());
// NOTE: only SHA1 is supported for key checksum calculations.
PGPDigestCalculator sha1Calc = new JcaPGPDigestCalculatorProviderBuilder()
.build().get(HashAlgorithmTags.SHA1);
PGPSecretKey masterSecretKey = new PGPSecretKey(keyPair.getPrivateKey(), keyPair.getPublicKey(),
sha1Calc, true, keyEncryptor);
PGPSecretKeyRing sKR = new PGPSecretKeyRing(
masterSecretKey.getEncoded(), new JcaKeyFingerprintCalculator());
subProgressPush(50, 100);
return internal(sKR, masterSecretKey, add.mFlags, add.mExpiry, saveParcel, "", log);
} catch (PGPException e) {
log.add(LogLevel.ERROR, LogType.MSG_CR_ERROR_INTERNAL_PGP, indent);
Log.e(Constants.TAG, "pgp error encoding key", e);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
} catch (IOException e) {
Log.e(Constants.TAG, "io error encoding key", e);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
}
/** This method introduces a list of modifications specified by a SaveKeyringParcel to a
* WrappedSecretKeyRing.
*
* This method relies on WrappedSecretKeyRing's canonicalization property!
*
* Note that PGPPublicKeyRings can not be directly modified. Instead, the corresponding
* PGPSecretKeyRing must be modified and consequently consolidated with its public counterpart.
* This is a natural workflow since pgp keyrings are immutable data structures: Old semantics
* are changed by adding new certificates, which implicitly override older certificates.
*
*/
public EditKeyResult modifySecretKeyRing(CanonicalizedSecretKeyRing wsKR, SaveKeyringParcel saveParcel,
String passphrase) {
OperationLog log = new OperationLog();
int indent = 0;
/*
* 1. Unlock private key
* 2a. Add certificates for new user ids
* 2b. Add revocations for revoked user ids
* 3. If primary user id changed, generate new certificates for both old and new
* 4a. For each subkey change, generate new subkey binding certificate
* 4b. For each subkey revocation, generate new subkey revocation certificate
* 5. Generate and add new subkeys
* 6. If requested, change passphrase
*/
log.add(LogLevel.START, LogType.MSG_MF, indent,
PgpKeyHelper.convertKeyIdToHex(wsKR.getMasterKeyId()));
indent += 1;
progress(R.string.progress_building_key, 0);
// Make sure this is called with a proper SaveKeyringParcel
if (saveParcel.mMasterKeyId == null || saveParcel.mMasterKeyId != wsKR.getMasterKeyId()) {
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_KEYID, indent);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
// We work on bouncycastle object level here
PGPSecretKeyRing sKR = wsKR.getRing();
PGPSecretKey masterSecretKey = sKR.getSecretKey();
// Make sure the fingerprint matches
if (saveParcel.mFingerprint == null
|| !Arrays.equals(saveParcel.mFingerprint,
masterSecretKey.getPublicKey().getFingerprint())) {
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_FINGERPRINT, indent);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
// read masterKeyFlags, and use the same as before.
// since this is the master key, this contains at least CERTIFY_OTHER
PGPPublicKey masterPublicKey = masterSecretKey.getPublicKey();
int masterKeyFlags = readKeyFlags(masterPublicKey) | KeyFlags.CERTIFY_OTHER;
long masterKeyExpiry = masterPublicKey.getValidSeconds() == 0L ? 0L :
masterPublicKey.getCreationTime().getTime() / 1000 + masterPublicKey.getValidSeconds();
return internal(sKR, masterSecretKey, masterKeyFlags, masterKeyExpiry, saveParcel, passphrase, log);
}
private EditKeyResult internal(PGPSecretKeyRing sKR, PGPSecretKey masterSecretKey,
int masterKeyFlags, long masterKeyExpiry,
SaveKeyringParcel saveParcel, String passphrase,
OperationLog log) {
int indent = 1;
progress(R.string.progress_modify, 0);
PGPPublicKey masterPublicKey = masterSecretKey.getPublicKey();
// 1. Unlock private key
progress(R.string.progress_modify_unlock, 10);
log.add(LogLevel.DEBUG, LogType.MSG_MF_UNLOCK, indent);
PGPPrivateKey masterPrivateKey;
{
try {
PBESecretKeyDecryptor keyDecryptor = new JcePBESecretKeyDecryptorBuilder().setProvider(
Constants.BOUNCY_CASTLE_PROVIDER_NAME).build(passphrase.toCharArray());
masterPrivateKey = masterSecretKey.extractPrivateKey(keyDecryptor);
} catch (PGPException e) {
log.add(LogLevel.ERROR, LogType.MSG_MF_UNLOCK_ERROR, indent + 1);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
}
try {
{ // work on master secret key
PGPPublicKey modifiedPublicKey = masterPublicKey;
// 2a. Add certificates for new user ids
subProgressPush(15, 25);
for (int i = 0; i < saveParcel.mAddUserIds.size(); i++) {
progress(R.string.progress_modify_adduid, (i - 1) * (100 / saveParcel.mAddUserIds.size()));
String userId = saveParcel.mAddUserIds.get(i);
log.add(LogLevel.INFO, LogType.MSG_MF_UID_ADD, indent, userId);
if (userId.equals("")) {
log.add(LogLevel.ERROR, LogType.MSG_MF_UID_ERROR_EMPTY, indent + 1);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
// this operation supersedes all previous binding and revocation certificates,
// so remove those to retain assertions from canonicalization for later operations
@SuppressWarnings("unchecked")
Iterator<PGPSignature> it = modifiedPublicKey.getSignaturesForID(userId);
if (it != null) {
for (PGPSignature cert : new IterableIterator<PGPSignature>(it)) {
if (cert.getKeyID() != masterPublicKey.getKeyID()) {
// foreign certificate?! error error error
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_INTEGRITY, indent);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
if (cert.getSignatureType() == PGPSignature.CERTIFICATION_REVOCATION
|| cert.getSignatureType() == PGPSignature.NO_CERTIFICATION
|| cert.getSignatureType() == PGPSignature.CASUAL_CERTIFICATION
|| cert.getSignatureType() == PGPSignature.POSITIVE_CERTIFICATION
|| cert.getSignatureType() == PGPSignature.DEFAULT_CERTIFICATION) {
modifiedPublicKey = PGPPublicKey.removeCertification(
modifiedPublicKey, userId, cert);
}
}
}
// if it's supposed to be primary, we can do that here as well
boolean isPrimary = saveParcel.mChangePrimaryUserId != null
&& userId.equals(saveParcel.mChangePrimaryUserId);
// generate and add new certificate
PGPSignature cert = generateUserIdSignature(masterPrivateKey,
masterPublicKey, userId, isPrimary, masterKeyFlags, masterKeyExpiry);
modifiedPublicKey = PGPPublicKey.addCertification(modifiedPublicKey, userId, cert);
}
subProgressPop();
// 2b. Add revocations for revoked user ids
subProgressPush(25, 40);
for (int i = 0; i < saveParcel.mRevokeUserIds.size(); i++) {
progress(R.string.progress_modify_revokeuid, (i - 1) * (100 / saveParcel.mRevokeUserIds.size()));
String userId = saveParcel.mRevokeUserIds.get(i);
log.add(LogLevel.INFO, LogType.MSG_MF_UID_REVOKE, indent, userId);
// Make sure the user id exists (yes these are 10 LoC in Java!)
boolean exists = false;
//noinspection unchecked
for (String uid : new IterableIterator<String>(modifiedPublicKey.getUserIDs())) {
if (userId.equals(uid)) {
exists = true;
break;
}
}
if (!exists) {
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_NOEXIST_REVOKE, indent);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
// a duplicate revocation will be removed during canonicalization, so no need to
// take care of that here.
PGPSignature cert = generateRevocationSignature(masterPrivateKey,
masterPublicKey, userId);
modifiedPublicKey = PGPPublicKey.addCertification(modifiedPublicKey, userId, cert);
}
subProgressPop();
// 3. If primary user id changed, generate new certificates for both old and new
if (saveParcel.mChangePrimaryUserId != null) {
progress(R.string.progress_modify_primaryuid, 40);
// keep track if we actually changed one
boolean ok = false;
log.add(LogLevel.INFO, LogType.MSG_MF_UID_PRIMARY, indent);
indent += 1;
// we work on the modifiedPublicKey here, to respect new or newly revoked uids
// noinspection unchecked
for (String userId : new IterableIterator<String>(modifiedPublicKey.getUserIDs())) {
boolean isRevoked = false;
PGPSignature currentCert = null;
// noinspection unchecked
for (PGPSignature cert : new IterableIterator<PGPSignature>(
modifiedPublicKey.getSignaturesForID(userId))) {
if (cert.getKeyID() != masterPublicKey.getKeyID()) {
// foreign certificate?! error error error
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_INTEGRITY, indent);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
// we know from canonicalization that if there is any revocation here, it
// is valid and not superseded by a newer certification.
if (cert.getSignatureType() == PGPSignature.CERTIFICATION_REVOCATION) {
isRevoked = true;
continue;
}
// we know from canonicalization that there is only one binding
// certification here, so we can just work with the first one.
if (cert.getSignatureType() == PGPSignature.NO_CERTIFICATION ||
cert.getSignatureType() == PGPSignature.CASUAL_CERTIFICATION ||
cert.getSignatureType() == PGPSignature.POSITIVE_CERTIFICATION ||
cert.getSignatureType() == PGPSignature.DEFAULT_CERTIFICATION) {
currentCert = cert;
}
}
if (currentCert == null) {
// no certificate found?! error error error
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_INTEGRITY, indent);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
// we definitely should not update certifications of revoked keys, so just leave it.
if (isRevoked) {
// revoked user ids cannot be primary!
if (userId.equals(saveParcel.mChangePrimaryUserId)) {
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_REVOKED_PRIMARY, indent);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
continue;
}
// if this is~ the/a primary user id
if (currentCert.getHashedSubPackets() != null
&& currentCert.getHashedSubPackets().isPrimaryUserID()) {
// if it's the one we want, just leave it as is
if (userId.equals(saveParcel.mChangePrimaryUserId)) {
ok = true;
continue;
}
// otherwise, generate new non-primary certification
log.add(LogLevel.DEBUG, LogType.MSG_MF_PRIMARY_REPLACE_OLD, indent);
modifiedPublicKey = PGPPublicKey.removeCertification(
modifiedPublicKey, userId, currentCert);
PGPSignature newCert = generateUserIdSignature(
masterPrivateKey, masterPublicKey, userId, false,
masterKeyFlags, masterKeyExpiry);
modifiedPublicKey = PGPPublicKey.addCertification(
modifiedPublicKey, userId, newCert);
continue;
}
// if we are here, this is not currently a primary user id
// if it should be
if (userId.equals(saveParcel.mChangePrimaryUserId)) {
// add shiny new primary user id certificate
log.add(LogLevel.DEBUG, LogType.MSG_MF_PRIMARY_NEW, indent);
modifiedPublicKey = PGPPublicKey.removeCertification(
modifiedPublicKey, userId, currentCert);
PGPSignature newCert = generateUserIdSignature(
masterPrivateKey, masterPublicKey, userId, true,
masterKeyFlags, masterKeyExpiry);
modifiedPublicKey = PGPPublicKey.addCertification(
modifiedPublicKey, userId, newCert);
ok = true;
}
// user id is not primary and is not supposed to be - nothing to do here.
}
indent -= 1;
if (!ok) {
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_NOEXIST_PRIMARY, indent);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
}
// Update the secret key ring
if (modifiedPublicKey != masterPublicKey) {
masterSecretKey = PGPSecretKey.replacePublicKey(masterSecretKey, modifiedPublicKey);
masterPublicKey = modifiedPublicKey;
sKR = PGPSecretKeyRing.insertSecretKey(sKR, masterSecretKey);
}
}
// 4a. For each subkey change, generate new subkey binding certificate
subProgressPush(50, 60);
for (int i = 0; i < saveParcel.mChangeSubKeys.size(); i++) {
progress(R.string.progress_modify_subkeychange, (i-1) * (100 / saveParcel.mChangeSubKeys.size()));
SaveKeyringParcel.SubkeyChange change = saveParcel.mChangeSubKeys.get(i);
log.add(LogLevel.INFO, LogType.MSG_MF_SUBKEY_CHANGE,
indent, PgpKeyHelper.convertKeyIdToHex(change.mKeyId));
PGPSecretKey sKey = sKR.getSecretKey(change.mKeyId);
if (sKey == null) {
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_SUBKEY_MISSING,
indent + 1, PgpKeyHelper.convertKeyIdToHex(change.mKeyId));
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
// expiry must not be in the past
if (change.mExpiry != null && change.mExpiry != 0 &&
new Date(change.mExpiry*1000).before(new Date())) {
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_PAST_EXPIRY,
indent + 1, PgpKeyHelper.convertKeyIdToHex(change.mKeyId));
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
// if this is the master key, update uid certificates instead
if (change.mKeyId == masterPublicKey.getKeyID()) {
int flags = change.mFlags == null ? masterKeyFlags : change.mFlags;
long expiry = change.mExpiry == null ? masterKeyExpiry : change.mExpiry;
if ((flags & KeyFlags.CERTIFY_OTHER) != KeyFlags.CERTIFY_OTHER) {
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_NO_CERTIFY, indent + 1);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
PGPPublicKey pKey =
updateMasterCertificates(masterPrivateKey, masterPublicKey,
flags, expiry, indent, log);
if (pKey == null) {
// error log entry has already been added by updateMasterCertificates itself
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
masterSecretKey = PGPSecretKey.replacePublicKey(masterSecretKey, pKey);
masterPublicKey = pKey;
sKR = PGPSecretKeyRing.insertSecretKey(sKR, masterSecretKey);
continue;
}
// otherwise, continue working on the public key
PGPPublicKey pKey = sKey.getPublicKey();
// keep old flags, or replace with new ones
int flags = change.mFlags == null ? readKeyFlags(pKey) : change.mFlags;
long expiry;
if (change.mExpiry == null) {
long valid = pKey.getValidSeconds();
expiry = valid == 0
? 0
: pKey.getCreationTime().getTime() / 1000 + pKey.getValidSeconds();
} else {
expiry = change.mExpiry;
}
// drop all old signatures, they will be superseded by the new one
//noinspection unchecked
for (PGPSignature sig : new IterableIterator<PGPSignature>(pKey.getSignatures())) {
// special case: if there is a revocation, don't use expiry from before
if ( (change.mExpiry == null || change.mExpiry == 0L)
&& sig.getSignatureType() == PGPSignature.SUBKEY_REVOCATION) {
expiry = 0;
}
pKey = PGPPublicKey.removeCertification(pKey, sig);
}
// generate and add new signature
PGPSignature sig = generateSubkeyBindingSignature(masterPublicKey, masterPrivateKey,
sKey, pKey, flags, expiry, passphrase);
pKey = PGPPublicKey.addCertification(pKey, sig);
sKR = PGPSecretKeyRing.insertSecretKey(sKR, PGPSecretKey.replacePublicKey(sKey, pKey));
}
subProgressPop();
// 4b. For each subkey revocation, generate new subkey revocation certificate
subProgressPush(60, 70);
for (int i = 0; i < saveParcel.mRevokeSubKeys.size(); i++) {
progress(R.string.progress_modify_subkeyrevoke, (i-1) * (100 / saveParcel.mRevokeSubKeys.size()));
long revocation = saveParcel.mRevokeSubKeys.get(i);
log.add(LogLevel.INFO, LogType.MSG_MF_SUBKEY_REVOKE,
indent, PgpKeyHelper.convertKeyIdToHex(revocation));
PGPSecretKey sKey = sKR.getSecretKey(revocation);
if (sKey == null) {
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_SUBKEY_MISSING,
indent+1, PgpKeyHelper.convertKeyIdToHex(revocation));
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
PGPPublicKey pKey = sKey.getPublicKey();
// generate and add new signature
PGPSignature sig = generateRevocationSignature(masterPublicKey, masterPrivateKey, pKey);
pKey = PGPPublicKey.addCertification(pKey, sig);
sKR = PGPSecretKeyRing.insertSecretKey(sKR, PGPSecretKey.replacePublicKey(sKey, pKey));
}
subProgressPop();
// 5. Generate and add new subkeys
subProgressPush(70, 90);
for (int i = 0; i < saveParcel.mAddSubKeys.size(); i++) {
progress(R.string.progress_modify_subkeyadd, (i-1) * (100 / saveParcel.mAddSubKeys.size()));
SaveKeyringParcel.SubkeyAdd add = saveParcel.mAddSubKeys.get(i);
log.add(LogLevel.INFO, LogType.MSG_MF_SUBKEY_NEW, indent, add.mKeysize,
PgpKeyHelper.getAlgorithmInfo(add.mAlgorithm) );
if (add.mExpiry == null) {
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_NULL_EXPIRY, indent +1);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
if (add.mExpiry > 0L && new Date(add.mExpiry*1000).before(new Date())) {
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_PAST_EXPIRY, indent +1);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
// generate a new secret key (privkey only for now)
subProgressPush(
(i-1) * (100 / saveParcel.mAddSubKeys.size()),
i * (100 / saveParcel.mAddSubKeys.size())
);
PGPKeyPair keyPair = createKey(add.mAlgorithm, add.mKeysize, log, indent);
subProgressPop();
if (keyPair == null) {
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_PGP, indent +1);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
// add subkey binding signature (making this a sub rather than master key)
PGPPublicKey pKey = keyPair.getPublicKey();
PGPSignature cert = generateSubkeyBindingSignature(
masterPublicKey, masterPrivateKey, keyPair.getPrivateKey(), pKey,
add.mFlags, add.mExpiry);
pKey = PGPPublicKey.addSubkeyBindingCertification(pKey, cert);
PGPSecretKey sKey; {
// Build key encrypter and decrypter based on passphrase
PGPDigestCalculator encryptorHashCalc = new JcaPGPDigestCalculatorProviderBuilder()
.build().get(SECRET_KEY_ENCRYPTOR_HASH_ALGO);
PBESecretKeyEncryptor keyEncryptor = new JcePBESecretKeyEncryptorBuilder(
SECRET_KEY_ENCRYPTOR_SYMMETRIC_ALGO, encryptorHashCalc, SECRET_KEY_ENCRYPTOR_S2K_COUNT)
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME).build(passphrase.toCharArray());
// NOTE: only SHA1 is supported for key checksum calculations.
PGPDigestCalculator sha1Calc = new JcaPGPDigestCalculatorProviderBuilder()
.build().get(HashAlgorithmTags.SHA1);
sKey = new PGPSecretKey(keyPair.getPrivateKey(), pKey, sha1Calc, false, keyEncryptor);
}
log.add(LogLevel.DEBUG, LogType.MSG_MF_SUBKEY_NEW_ID,
indent+1, PgpKeyHelper.convertKeyIdToHex(sKey.getKeyID()));
sKR = PGPSecretKeyRing.insertSecretKey(sKR, sKey);
}
subProgressPop();
// 6. If requested, change passphrase
if (saveParcel.mNewPassphrase != null) {
progress(R.string.progress_modify_passphrase, 90);
log.add(LogLevel.INFO, LogType.MSG_MF_PASSPHRASE, indent);
indent += 1;
PGPDigestCalculator encryptorHashCalc = new JcaPGPDigestCalculatorProviderBuilder().build()
.get(SECRET_KEY_ENCRYPTOR_HASH_ALGO);
PBESecretKeyDecryptor keyDecryptor = new JcePBESecretKeyDecryptorBuilder().setProvider(
Constants.BOUNCY_CASTLE_PROVIDER_NAME).build(passphrase.toCharArray());
// Build key encryptor based on new passphrase
PBESecretKeyEncryptor keyEncryptorNew = new JcePBESecretKeyEncryptorBuilder(
SECRET_KEY_ENCRYPTOR_SYMMETRIC_ALGO, encryptorHashCalc, SECRET_KEY_ENCRYPTOR_S2K_COUNT)
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME).build(
saveParcel.mNewPassphrase.toCharArray());
// noinspection unchecked
for (PGPSecretKey sKey : new IterableIterator<PGPSecretKey>(sKR.getSecretKeys())) {
log.add(LogLevel.DEBUG, LogType.MSG_MF_PASSPHRASE_KEY, indent,
PgpKeyHelper.convertKeyIdToHex(sKey.getKeyID()));
boolean ok = false;
try {
// try to set new passphrase
sKey = PGPSecretKey.copyWithNewPassword(sKey, keyDecryptor, keyEncryptorNew);
ok = true;
} catch (PGPException e) {
// if this is the master key, error!
if (sKey.getKeyID() == masterPublicKey.getKeyID()) {
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_PASSPHRASE_MASTER, indent+1);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
// being in here means decrypt failed, likely due to a bad passphrase try
// again with an empty passphrase, maybe we can salvage this
try {
log.add(LogLevel.DEBUG, LogType.MSG_MF_PASSPHRASE_EMPTY_RETRY, indent+1);
PBESecretKeyDecryptor emptyDecryptor =
new JcePBESecretKeyDecryptorBuilder().setProvider(
Constants.BOUNCY_CASTLE_PROVIDER_NAME).build("".toCharArray());
sKey = PGPSecretKey.copyWithNewPassword(sKey, emptyDecryptor, keyEncryptorNew);
ok = true;
} catch (PGPException e2) {
// non-fatal but not ok, handled below
}
}
if (!ok) {
// for a subkey, it's merely a warning
log.add(LogLevel.WARN, LogType.MSG_MF_PASSPHRASE_FAIL, indent+1,
PgpKeyHelper.convertKeyIdToHex(sKey.getKeyID()));
continue;
}
sKR = PGPSecretKeyRing.insertSecretKey(sKR, sKey);
}
indent -= 1;
}
} catch (IOException e) {
Log.e(Constants.TAG, "encountered IOException while modifying key", e);
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_ENCODE, indent+1);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
} catch (PGPException e) {
Log.e(Constants.TAG, "encountered pgp error while modifying key", e);
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_PGP, indent+1);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
} catch (SignatureException e) {
Log.e(Constants.TAG, "encountered SignatureException while modifying key", e);
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_SIG, indent+1);
return new EditKeyResult(EditKeyResult.RESULT_ERROR, log, null);
}
progress(R.string.progress_done, 100);
log.add(LogLevel.OK, LogType.MSG_MF_SUCCESS, indent);
return new EditKeyResult(OperationResultParcel.RESULT_OK, log, new UncachedKeyRing(sKR));
}
/** Update all (non-revoked) uid signatures with new flags and expiry time. */
private static PGPPublicKey updateMasterCertificates(
PGPPrivateKey masterPrivateKey, PGPPublicKey masterPublicKey,
int flags, long expiry, int indent, OperationLog log)
throws PGPException, IOException, SignatureException {
// keep track if we actually changed one
boolean ok = false;
log.add(LogLevel.DEBUG, LogType.MSG_MF_MASTER, indent);
indent += 1;
PGPPublicKey modifiedPublicKey = masterPublicKey;
// we work on the modifiedPublicKey here, to respect new or newly revoked uids
// noinspection unchecked
for (String userId : new IterableIterator<String>(modifiedPublicKey.getUserIDs())) {
boolean isRevoked = false;
PGPSignature currentCert = null;
// noinspection unchecked
for (PGPSignature cert : new IterableIterator<PGPSignature>(
modifiedPublicKey.getSignaturesForID(userId))) {
if (cert.getKeyID() != masterPublicKey.getKeyID()) {
// foreign certificate?! error error error
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_INTEGRITY, indent);
return null;
}
// we know from canonicalization that if there is any revocation here, it
// is valid and not superseded by a newer certification.
if (cert.getSignatureType() == PGPSignature.CERTIFICATION_REVOCATION) {
isRevoked = true;
continue;
}
// we know from canonicalization that there is only one binding
// certification here, so we can just work with the first one.
if (cert.getSignatureType() == PGPSignature.NO_CERTIFICATION ||
cert.getSignatureType() == PGPSignature.CASUAL_CERTIFICATION ||
cert.getSignatureType() == PGPSignature.POSITIVE_CERTIFICATION ||
cert.getSignatureType() == PGPSignature.DEFAULT_CERTIFICATION) {
currentCert = cert;
}
}
if (currentCert == null) {
// no certificate found?! error error error
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_INTEGRITY, indent);
return null;
}
// we definitely should not update certifications of revoked keys, so just leave it.
if (isRevoked) {
continue;
}
// add shiny new user id certificate
boolean isPrimary = currentCert.getHashedSubPackets() != null &&
currentCert.getHashedSubPackets().isPrimaryUserID();
modifiedPublicKey = PGPPublicKey.removeCertification(
modifiedPublicKey, userId, currentCert);
PGPSignature newCert = generateUserIdSignature(
masterPrivateKey, masterPublicKey, userId, isPrimary, flags, expiry);
modifiedPublicKey = PGPPublicKey.addCertification(
modifiedPublicKey, userId, newCert);
ok = true;
}
if (!ok) {
// might happen, theoretically, if there is a key with no uid..
log.add(LogLevel.ERROR, LogType.MSG_MF_ERROR_MASTER_NONE, indent);
return null;
}
return modifiedPublicKey;
}
private static PGPSignature generateUserIdSignature(
PGPPrivateKey masterPrivateKey, PGPPublicKey pKey, String userId, boolean primary,
int flags, long expiry)
throws IOException, PGPException, SignatureException {
PGPContentSignerBuilder signerBuilder = new JcaPGPContentSignerBuilder(
masterPrivateKey.getPublicKeyPacket().getAlgorithm(), HashAlgorithmTags.SHA512)
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
PGPSignatureGenerator sGen = new PGPSignatureGenerator(signerBuilder);
PGPSignatureSubpacketGenerator hashedPacketsGen = new PGPSignatureSubpacketGenerator();
{
/*
* From RFC about critical subpackets:
* If a subpacket is encountered that is
* marked critical but is unknown to the evaluating software, the
* evaluator SHOULD consider the signature to be in error.
* An evaluator may "recognize" a subpacket, but not implement it. The
* purpose of the critical bit is to allow the signer to tell an
* evaluator that it would prefer a new, unknown feature to generate an
* error than be ignored.
*/
/* non-critical subpackets: */
hashedPacketsGen.setPreferredSymmetricAlgorithms(false, PREFERRED_SYMMETRIC_ALGORITHMS);
hashedPacketsGen.setPreferredHashAlgorithms(false, PREFERRED_HASH_ALGORITHMS);
hashedPacketsGen.setPreferredCompressionAlgorithms(false, PREFERRED_COMPRESSION_ALGORITHMS);
hashedPacketsGen.setPrimaryUserID(false, primary);
/* critical subpackets: we consider those important for a modern pgp implementation */
hashedPacketsGen.setSignatureCreationTime(true, new Date());
// Request that senders add the MDC to the message (authenticate unsigned messages)
hashedPacketsGen.setFeature(true, Features.FEATURE_MODIFICATION_DETECTION);
hashedPacketsGen.setKeyFlags(true, flags);
if (expiry > 0) {
hashedPacketsGen.setKeyExpirationTime(
true, expiry - pKey.getCreationTime().getTime() / 1000);
}
}
sGen.setHashedSubpackets(hashedPacketsGen.generate());
sGen.init(PGPSignature.POSITIVE_CERTIFICATION, masterPrivateKey);
return sGen.generateCertification(userId, pKey);
}
private static PGPSignature generateRevocationSignature(
PGPPrivateKey masterPrivateKey, PGPPublicKey pKey, String userId)
throws IOException, PGPException, SignatureException {
PGPContentSignerBuilder signerBuilder = new JcaPGPContentSignerBuilder(
masterPrivateKey.getPublicKeyPacket().getAlgorithm(), HashAlgorithmTags.SHA512)
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
PGPSignatureGenerator sGen = new PGPSignatureGenerator(signerBuilder);
PGPSignatureSubpacketGenerator subHashedPacketsGen = new PGPSignatureSubpacketGenerator();
subHashedPacketsGen.setSignatureCreationTime(true, new Date());
sGen.setHashedSubpackets(subHashedPacketsGen.generate());
sGen.init(PGPSignature.CERTIFICATION_REVOCATION, masterPrivateKey);
return sGen.generateCertification(userId, pKey);
}
private static PGPSignature generateRevocationSignature(
PGPPublicKey masterPublicKey, PGPPrivateKey masterPrivateKey, PGPPublicKey pKey)
throws IOException, PGPException, SignatureException {
PGPContentSignerBuilder signerBuilder = new JcaPGPContentSignerBuilder(
masterPublicKey.getAlgorithm(), HashAlgorithmTags.SHA512)
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
PGPSignatureGenerator sGen = new PGPSignatureGenerator(signerBuilder);
PGPSignatureSubpacketGenerator subHashedPacketsGen = new PGPSignatureSubpacketGenerator();
subHashedPacketsGen.setSignatureCreationTime(true, new Date());
sGen.setHashedSubpackets(subHashedPacketsGen.generate());
// Generate key revocation or subkey revocation, depending on master/subkey-ness
if (masterPublicKey.getKeyID() == pKey.getKeyID()) {
sGen.init(PGPSignature.KEY_REVOCATION, masterPrivateKey);
return sGen.generateCertification(masterPublicKey);
} else {
sGen.init(PGPSignature.SUBKEY_REVOCATION, masterPrivateKey);
return sGen.generateCertification(masterPublicKey, pKey);
}
}
private static PGPSignature generateSubkeyBindingSignature(
PGPPublicKey masterPublicKey, PGPPrivateKey masterPrivateKey,
PGPSecretKey sKey, PGPPublicKey pKey, int flags, long expiry, String passphrase)
throws IOException, PGPException, SignatureException {
PBESecretKeyDecryptor keyDecryptor = new JcePBESecretKeyDecryptorBuilder()
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME).build(
passphrase.toCharArray());
PGPPrivateKey subPrivateKey = sKey.extractPrivateKey(keyDecryptor);
return generateSubkeyBindingSignature(masterPublicKey, masterPrivateKey, subPrivateKey,
pKey, flags, expiry);
}
private static PGPSignature generateSubkeyBindingSignature(
PGPPublicKey masterPublicKey, PGPPrivateKey masterPrivateKey,
PGPPrivateKey subPrivateKey, PGPPublicKey pKey, int flags, long expiry)
throws IOException, PGPException, SignatureException {
// date for signing
Date creationTime = new Date();
PGPSignatureSubpacketGenerator unhashedPacketsGen = new PGPSignatureSubpacketGenerator();
// If this key can sign, we need a primary key binding signature
if ((flags & KeyFlags.SIGN_DATA) > 0) {
// cross-certify signing keys
PGPSignatureSubpacketGenerator subHashedPacketsGen = new PGPSignatureSubpacketGenerator();
subHashedPacketsGen.setSignatureCreationTime(false, creationTime);
PGPContentSignerBuilder signerBuilder = new JcaPGPContentSignerBuilder(
pKey.getAlgorithm(), HashAlgorithmTags.SHA512)
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
PGPSignatureGenerator sGen = new PGPSignatureGenerator(signerBuilder);
sGen.init(PGPSignature.PRIMARYKEY_BINDING, subPrivateKey);
sGen.setHashedSubpackets(subHashedPacketsGen.generate());
PGPSignature certification = sGen.generateCertification(masterPublicKey, pKey);
unhashedPacketsGen.setEmbeddedSignature(true, certification);
}
PGPSignatureSubpacketGenerator hashedPacketsGen;
{
hashedPacketsGen = new PGPSignatureSubpacketGenerator();
hashedPacketsGen.setSignatureCreationTime(true, creationTime);
hashedPacketsGen.setKeyFlags(true, flags);
if (expiry > 0) {
hashedPacketsGen.setKeyExpirationTime(true,
expiry - pKey.getCreationTime().getTime() / 1000);
}
}
PGPContentSignerBuilder signerBuilder = new JcaPGPContentSignerBuilder(
masterPublicKey.getAlgorithm(), HashAlgorithmTags.SHA512)
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
PGPSignatureGenerator sGen = new PGPSignatureGenerator(signerBuilder);
sGen.init(PGPSignature.SUBKEY_BINDING, masterPrivateKey);
sGen.setHashedSubpackets(hashedPacketsGen.generate());
sGen.setUnhashedSubpackets(unhashedPacketsGen.generate());
return sGen.generateCertification(masterPublicKey, pKey);
}
/** Returns all flags valid for this key.
*
* This method does not do any validity checks on the signature, so it should not be used on
* a non-canonicalized key!
*
*/
private static int readKeyFlags(PGPPublicKey key) {
int flags = 0;
//noinspection unchecked
for(PGPSignature sig : new IterableIterator<PGPSignature>(key.getSignatures())) {
if (sig.getHashedSubPackets() == null) {
continue;
}
flags |= sig.getHashedSubPackets().getKeyFlags();
}
return flags;
}
}
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