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rewrote scram cache implementation

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This commit is contained in:
Daniel Gultsch 2020-12-30 22:01:08 +01:00
parent 692ee6c9fb
commit 2a57c92f63
1 changed files with 44 additions and 8 deletions
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52
src/main/java/eu/siacs/conversations/crypto/sasl/ScramMechanism.java
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@ -4,6 +4,10 @@ import android.annotation.TargetApi;
import android.os.Build;
import android.util.Base64;
import com.google.common.base.Objects;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.macs.HMac;
import org.bouncycastle.crypto.params.KeyParameter;
@ -11,6 +15,7 @@ import org.bouncycastle.crypto.params.KeyParameter;
import java.nio.charset.Charset;
import java.security.InvalidKeyException;
import java.security.SecureRandom;
import java.util.concurrent.ExecutionException;
import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.utils.CryptoHelper;
@ -27,17 +32,46 @@ abstract class ScramMechanism extends SaslMechanism {
protected abstract Digest getDigest();
private KeyPair getKeyPair(final String password, final String salt, final int iterations) {
try {
private static final Cache<CacheKey, KeyPair> CACHE = CacheBuilder.newBuilder().maximumSize(10).build();
private static class CacheKey {
final String algorithm;
final String password;
final String salt;
final int iterations;
private CacheKey(String algorithm, String password, String salt, int iterations) {
this.algorithm = algorithm;
this.password = password;
this.salt = salt;
this.iterations = iterations;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
CacheKey cacheKey = (CacheKey) o;
return iterations == cacheKey.iterations &&
Objects.equal(algorithm, cacheKey.algorithm) &&
Objects.equal(password, cacheKey.password) &&
Objects.equal(salt, cacheKey.salt);
}
@Override
public int hashCode() {
return Objects.hashCode(algorithm, password, salt, iterations);
}
}
private KeyPair getKeyPair(final String password, final String salt, final int iterations) throws ExecutionException {
return CACHE.get(new CacheKey(getHMAC().getAlgorithmName(), password, salt, iterations), () -> {
final byte[] saltedPassword, serverKey, clientKey;
saltedPassword = hi(password.getBytes(), Base64.decode(salt, Base64.DEFAULT), iterations);
serverKey = hmac(saltedPassword, SERVER_KEY_BYTES);
clientKey = hmac(saltedPassword, CLIENT_KEY_BYTES);
return new KeyPair(clientKey, serverKey);
} catch (final InvalidKeyException | NumberFormatException e) {
return null;
}
});
}
private final String clientNonce;
@ -162,8 +196,10 @@ abstract class ScramMechanism extends SaslMechanism {
final byte[] authMessage = (clientFirstMessageBare + ',' + new String(serverFirstMessage) + ','
+ clientFinalMessageWithoutProof).getBytes();
final KeyPair keys = getKeyPair(CryptoHelper.saslPrep(account.getPassword()), salt, iterationCount);
if (keys == null) {
final KeyPair keys;
try {
keys = getKeyPair(CryptoHelper.saslPrep(account.getPassword()), salt, iterationCount);
} catch (ExecutionException e) {
throw new AuthenticationException("Invalid keys generated");
}
final byte[] clientSignature;