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// Copyright (C) 2010 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.reviewdb.Account;
import com.google.gerrit.server.AccessPath;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.PeerDaemonUser;
import com.google.gerrit.sshd.SshScope.Context;
import com.google.inject.Inject;
import com.google.inject.Provider;
import org.apache.sshd.server.Command;
import org.apache.sshd.server.Environment;
import org.kohsuke.args4j.Argument;
import org.kohsuke.args4j.Option;
import java.io.IOException;
import java.net.SocketAddress;
import java.util.ArrayList;
import java.util.List;
/**
* Executes any other command as a different user identity.
* <p>
* The calling user must be authenticated as a {@link PeerDaemonUser}, which
* usually requires public key authentication using this daemon's private host
* key, or a key on this daemon's peer host key ring.
*/
public final class SuExec extends BaseCommand {
private final DispatchCommandProvider dispatcher;
private Provider<CurrentUser> caller;
private Provider<SshSession> session;
private IdentifiedUser.GenericFactory userFactory;
private SshScope.Context callingContext;
@Option(name = "--as", required = true)
private Account.Id accountId;
@Option(name = "--from")
private SocketAddress peerAddress;
@Argument(index = 0, multiValued = true, metaVar = "COMMAND")
private List<String> args = new ArrayList<String>();
private Command cmd;
@Inject
SuExec(@CommandName(Commands.ROOT) final DispatchCommandProvider dispatcher,
final Provider<CurrentUser> caller, final Provider<SshSession> session,
final IdentifiedUser.GenericFactory userFactory,
final SshScope.Context callingContext) {
this.dispatcher = dispatcher;
this.caller = caller;
this.session = session;
this.userFactory = userFactory;
this.callingContext = callingContext;
}
@Override
public void start(Environment env) throws IOException {
try {
if (caller.get() instanceof PeerDaemonUser) {
parseCommandLine();
final Context ctx = callingContext.subContext(newSession(), join(args));
final Context old = SshScope.set(ctx);
try {
final BaseCommand cmd = dispatcher.get();
cmd.setArguments(args.toArray(new String[args.size()]));
provideStateTo(cmd);
synchronized (this) {
this.cmd = cmd;
}
cmd.start(env);
} finally {
SshScope.set(old);
}
} else {
throw new UnloggedFailure(1, "fatal: Not a peer daemon");
}
} catch (UnloggedFailure e) {
String msg = e.getMessage();
if (!msg.endsWith("\n")) {
msg += "\n";
}
err.write(msg.getBytes("UTF-8"));
err.flush();
onExit(1);
}
}
private SshSession newSession() {
final SocketAddress peer;
if (peerAddress == null) {
peer = session.get().getRemoteAddress();
} else {
peer = peerAddress;
}
return new SshSession(session.get(), peer, userFactory.create(
AccessPath.SSH_COMMAND, new Provider<SocketAddress>() {
@Override
public SocketAddress get() {
return peer;
}
}, accountId));
}
private static String join(List<String> args) {
StringBuilder r = new StringBuilder();
for (String a : args) {
if (r.length() > 0) {
r.append(" ");
}
r.append(a);
}
return r.toString();
}
@Override
public void destroy() {
synchronized (this) {
if (cmd != null) {
cmd.destroy();
cmd = null;
}
}
}
}
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