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// Copyright (C) 2015 The Android Open Source Project
//
// 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.google.gerrit.gpg;
import com.google.common.base.Strings;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.extensions.registration.DynamicSet;
import com.google.gerrit.reviewdb.client.BooleanProjectConfig;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.server.EnableSignedPush;
import com.google.gerrit.server.config.AllUsersName;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.git.ReceivePackInitializer;
import com.google.gerrit.server.project.ProjectCache;
import com.google.gerrit.server.project.ProjectState;
import com.google.inject.AbstractModule;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.ProvisionException;
import com.google.inject.Singleton;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import org.eclipse.jgit.lib.Config;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.transport.PreReceiveHook;
import org.eclipse.jgit.transport.PreReceiveHookChain;
import org.eclipse.jgit.transport.ReceivePack;
import org.eclipse.jgit.transport.SignedPushConfig;
class SignedPushModule extends AbstractModule {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
@Override
protected void configure() {
if (!BouncyCastleUtil.havePGP()) {
throw new ProvisionException("Bouncy Castle PGP not installed");
}
bind(PublicKeyStore.class).toProvider(StoreProvider.class);
DynamicSet.bind(binder(), ReceivePackInitializer.class).to(Initializer.class);
}
@Singleton
private static class Initializer implements ReceivePackInitializer {
private final SignedPushConfig signedPushConfig;
private final SignedPushPreReceiveHook hook;
private final ProjectCache projectCache;
@Inject
Initializer(
@GerritServerConfig Config cfg,
@EnableSignedPush boolean enableSignedPush,
SignedPushPreReceiveHook hook,
ProjectCache projectCache) {
this.hook = hook;
this.projectCache = projectCache;
if (enableSignedPush) {
String seed = cfg.getString("receive", null, "certNonceSeed");
if (Strings.isNullOrEmpty(seed)) {
seed = randomString(64);
}
signedPushConfig = new SignedPushConfig();
signedPushConfig.setCertNonceSeed(seed);
signedPushConfig.setCertNonceSlopLimit(
cfg.getInt("receive", null, "certNonceSlop", 5 * 60));
} else {
signedPushConfig = null;
}
}
@Override
public void init(Project.NameKey project, ReceivePack rp) {
ProjectState ps = projectCache.get(project);
if (!ps.is(BooleanProjectConfig.ENABLE_SIGNED_PUSH)) {
rp.setSignedPushConfig(null);
return;
} else if (signedPushConfig == null) {
logger.atSevere().log(
"receive.enableSignedPush is true for project %s but"
+ " false in gerrit.config, so signed push verification is"
+ " disabled",
project.get());
rp.setSignedPushConfig(null);
return;
}
rp.setSignedPushConfig(signedPushConfig);
List<PreReceiveHook> hooks = new ArrayList<>(3);
if (ps.is(BooleanProjectConfig.REQUIRE_SIGNED_PUSH)) {
hooks.add(SignedPushPreReceiveHook.Required.INSTANCE);
}
hooks.add(hook);
hooks.add(rp.getPreReceiveHook());
rp.setPreReceiveHook(PreReceiveHookChain.newChain(hooks));
}
}
@Singleton
private static class StoreProvider implements Provider<PublicKeyStore> {
private final GitRepositoryManager repoManager;
private final AllUsersName allUsers;
@Inject
StoreProvider(GitRepositoryManager repoManager, AllUsersName allUsers) {
this.repoManager = repoManager;
this.allUsers = allUsers;
}
@Override
public PublicKeyStore get() {
final Repository repo;
try {
repo = repoManager.openRepository(allUsers);
} catch (IOException e) {
throw new ProvisionException("Cannot open " + allUsers, e);
}
return new PublicKeyStore(repo) {
@Override
public void close() {
try {
super.close();
} finally {
repo.close();
}
}
};
}
}
private static String randomString(int len) {
Random random;
try {
random = SecureRandom.getInstance("SHA1PRNG");
} catch (NoSuchAlgorithmException e) {
throw new IllegalStateException(e);
}
StringBuilder sb = new StringBuilder(len);
for (int i = 0; i < len; i++) {
sb.append((char) random.nextInt());
}
return sb.toString();
}
}
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