com.google.gerrit.sshd.HostKeyProvider Maven / Gradle / Ivy
// Copyright (C) 2009 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.sshd;
import com.google.gerrit.server.config.SitePaths;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.ProvisionException;
import org.apache.sshd.common.KeyPairProvider;
import org.apache.sshd.common.keyprovider.FileKeyPairProvider;
import org.apache.sshd.common.util.SecurityUtils;
import org.apache.sshd.server.keyprovider.SimpleGeneratorHostKeyProvider;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
class HostKeyProvider implements Provider {
private final SitePaths site;
@Inject
HostKeyProvider(final SitePaths site) {
this.site = site;
}
@Override
public KeyPairProvider get() {
final File objKey = site.ssh_key;
final File rsaKey = site.ssh_rsa;
final File dsaKey = site.ssh_dsa;
final List stdKeys = new ArrayList<>(2);
if (rsaKey.exists()) {
stdKeys.add(rsaKey.getAbsolutePath());
}
if (dsaKey.exists()) {
stdKeys.add(dsaKey.getAbsolutePath());
}
if (objKey.exists()) {
if (stdKeys.isEmpty()) {
SimpleGeneratorHostKeyProvider p = new SimpleGeneratorHostKeyProvider();
p.setPath(objKey.getAbsolutePath());
return p;
} else {
// Both formats of host key exist, we don't know which format
// should be authoritative. Complain and abort.
//
stdKeys.add(objKey.getAbsolutePath());
throw new ProvisionException("Multiple host keys exist: " + stdKeys);
}
} else {
if (stdKeys.isEmpty()) {
throw new ProvisionException("No SSH keys under " + site.etc_dir);
}
if (!SecurityUtils.isBouncyCastleRegistered()) {
throw new ProvisionException("Bouncy Castle Crypto not installed;"
+ " needed to read server host keys: " + stdKeys + "");
}
return new FileKeyPairProvider(stdKeys
.toArray(new String[stdKeys.size()]));
}
}
}