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/*
* Copyright 2000-2010 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.intellij.ide.passwordSafe.impl.providers.memory;
import com.intellij.ide.passwordSafe.impl.PasswordSafeTimed;
import com.intellij.ide.passwordSafe.impl.providers.BasePasswordSafeProvider;
import com.intellij.ide.passwordSafe.impl.providers.ByteArrayWrapper;
import com.intellij.ide.passwordSafe.impl.providers.EncryptionUtil;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.registry.Registry;
import com.intellij.util.containers.ContainerUtil;
import org.jetbrains.annotations.NotNull;
import java.security.SecureRandom;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.atomic.AtomicReference;
/**
* The provider that stores passwords in memory in encrypted from. It does not stores passwords on the disk,
* so all passwords are forgotten after application exit. Some efforts are done to complicate retrieving passwords
* from page file. However the passwords could be still retrieved from the memory using debugger or full memory dump.
*/
public class MemoryPasswordSafe extends BasePasswordSafeProvider {
/**
* The key to use to encrypt data
*/
private transient final AtomicReference<byte[]> key = new AtomicReference<byte[]>();
/**
* The password database
*/
private transient final PasswordSafeTimed<Map<ByteArrayWrapper, byte[]>> database = new PasswordSafeTimed<Map<ByteArrayWrapper, byte[]>>() {
protected Map<ByteArrayWrapper, byte[]> compute() {
return Collections.synchronizedMap(ContainerUtil.<ByteArrayWrapper, byte[]>newHashMap());
}
@Override
protected int getMinutesToLive() {
return MemoryPasswordSafe.this.getMinutesToLive();
}
};
protected int getMinutesToLive() {
return Registry.intValue("passwordSafe.memorySafe.ttl");
}
@NotNull
@Override
protected byte[] key(Project project, @NotNull Class requestor) {
if (key.get() == null) {
byte[] rnd = new byte[EncryptionUtil.SECRET_KEY_SIZE_BYTES * 16];
new SecureRandom().nextBytes(rnd);
key.compareAndSet(null, EncryptionUtil.genKey(EncryptionUtil.hash(rnd)));
}
return key.get();
}
@Override
protected byte[] getEncryptedPassword(byte[] key) {
return database.get().get(new ByteArrayWrapper(key));
}
@Override
protected void removeEncryptedPassword(byte[] key) {
database.get().remove(new ByteArrayWrapper(key));
}
@Override
protected void storeEncryptedPassword(byte[] key, byte[] encryptedPassword) {
database.get().put(new ByteArrayWrapper(key), encryptedPassword);
}
@Override
public boolean isSupported() {
return true;
}
@Override
public String getDescription() {
return "Memory-based password safe provider. The passwords are stored only for the duration of IDEA process.";
}
@Override
public String getName() {
return "Memory PasswordSafe";
}
}
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