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com.google.gerrit.sshd.SshLog 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.common.collect.ListMultimap;
import com.google.common.collect.MultimapBuilder;
import com.google.gerrit.extensions.events.LifecycleListener;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.PeerDaemonUser;
import com.google.gerrit.server.audit.AuditService;
import com.google.gerrit.server.audit.SshAuditEvent;
import com.google.gerrit.server.config.ConfigKey;
import com.google.gerrit.server.config.ConfigUpdatedEvent;
import com.google.gerrit.server.config.GerritConfigListener;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.gerrit.server.ioutil.HexFormat;
import com.google.gerrit.server.util.SystemLog;
import com.google.gerrit.server.util.time.TimeUtil;
import com.google.gerrit.sshd.SshScope.Context;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.util.Collections;
import java.util.List;
import org.apache.log4j.AsyncAppender;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.spi.LoggingEvent;
import org.eclipse.jgit.lib.Config;
@Singleton
class SshLog implements LifecycleListener, GerritConfigListener {
private static final Logger log = Logger.getLogger(SshLog.class);
private static final String LOG_NAME = "sshd_log";
private static final String P_SESSION = "session";
private static final String P_USER_NAME = "userName";
private static final String P_ACCOUNT_ID = "accountId";
private static final String P_WAIT = "queueWaitTime";
private static final String P_EXEC = "executionTime";
private static final String P_STATUS = "status";
private static final String P_AGENT = "agent";
private final Provider session;
private final Provider context;
private volatile AsyncAppender async;
private final AuditService auditService;
private final SystemLog systemLog;
private final Object lock = new Object();
@Inject
SshLog(
final Provider session,
final Provider context,
SystemLog systemLog,
@GerritServerConfig Config config,
AuditService auditService) {
this.session = session;
this.context = context;
this.auditService = auditService;
this.systemLog = systemLog;
if (config.getBoolean("sshd", "requestLog", true)) {
enableLogging();
}
}
/** @return true if a change in state has occurred */
public boolean enableLogging() {
synchronized (lock) {
if (async == null) {
async = systemLog.createAsyncAppender(LOG_NAME, new SshLogLayout());
return true;
}
return false;
}
}
/** @return true if a change in state has occurred */
public boolean disableLogging() {
synchronized (lock) {
if (async != null) {
async.close();
async = null;
return true;
}
return false;
}
}
@Override
public void start() {}
@Override
public void stop() {
disableLogging();
}
void onLogin() {
LoggingEvent entry = log("LOGIN FROM " + session.get().getRemoteAddressAsString());
if (async != null) {
async.append(entry);
}
audit(context.get(), "0", "LOGIN");
}
void onAuthFail(SshSession sd) {
final LoggingEvent event =
new LoggingEvent( //
Logger.class.getName(), // fqnOfCategoryClass
log, // logger
TimeUtil.nowMs(), // when
Level.INFO, // level
"AUTH FAILURE FROM " + sd.getRemoteAddressAsString(), // message text
"SSHD", // thread name
null, // exception information
null, // current NDC string
null, // caller location
null // MDC properties
);
event.setProperty(P_SESSION, id(sd.getSessionId()));
event.setProperty(P_USER_NAME, sd.getUsername());
final String error = sd.getAuthenticationError();
if (error != null) {
event.setProperty(P_STATUS, error);
}
if (async != null) {
async.append(event);
}
audit(null, "FAIL", "AUTH");
}
void onExecute(DispatchCommand dcmd, int exitValue, SshSession sshSession) {
final Context ctx = context.get();
ctx.finished = TimeUtil.nowMs();
String cmd = extractWhat(dcmd);
final LoggingEvent event = log(cmd);
event.setProperty(P_WAIT, (ctx.started - ctx.created) + "ms");
event.setProperty(P_EXEC, (ctx.finished - ctx.started) + "ms");
final String status;
switch (exitValue) {
case BaseCommand.STATUS_CANCEL:
status = "killed";
break;
case BaseCommand.STATUS_NOT_FOUND:
status = "not-found";
break;
case BaseCommand.STATUS_NOT_ADMIN:
status = "not-admin";
break;
default:
status = String.valueOf(exitValue);
break;
}
event.setProperty(P_STATUS, status);
String peerAgent = sshSession.getPeerAgent();
if (peerAgent != null) {
event.setProperty(P_AGENT, peerAgent);
}
if (async != null) {
async.append(event);
}
audit(context.get(), status, dcmd);
}
private ListMultimap extractParameters(DispatchCommand dcmd) {
if (dcmd == null) {
return MultimapBuilder.hashKeys(0).arrayListValues(0).build();
}
String[] cmdArgs = dcmd.getArguments();
String paramName = null;
int argPos = 0;
ListMultimap parms = MultimapBuilder.hashKeys().arrayListValues().build();
for (int i = 2; i < cmdArgs.length; i++) {
String arg = cmdArgs[i];
// -- stop parameters parsing
if (arg.equals("--")) {
for (i++; i < cmdArgs.length; i++) {
parms.put("$" + argPos++, cmdArgs[i]);
}
break;
}
// --param=value
int eqPos = arg.indexOf('=');
if (arg.startsWith("--") && eqPos > 0) {
parms.put(arg.substring(0, eqPos), arg.substring(eqPos + 1));
continue;
}
// -p value or --param value
if (arg.startsWith("-")) {
if (paramName != null) {
parms.put(paramName, null);
}
paramName = arg;
continue;
}
// value
if (paramName == null) {
parms.put("$" + argPos++, arg);
} else {
parms.put(paramName, arg);
paramName = null;
}
}
if (paramName != null) {
parms.put(paramName, null);
}
return parms;
}
void onLogout() {
LoggingEvent entry = log("LOGOUT");
if (async != null) {
async.append(entry);
}
audit(context.get(), "0", "LOGOUT");
}
private LoggingEvent log(String msg) {
final SshSession sd = session.get();
final CurrentUser user = sd.getUser();
final LoggingEvent event =
new LoggingEvent( //
Logger.class.getName(), // fqnOfCategoryClass
log, // logger
TimeUtil.nowMs(), // when
Level.INFO, // level
msg, // message text
"SSHD", // thread name
null, // exception information
null, // current NDC string
null, // caller location
null // MDC properties
);
event.setProperty(P_SESSION, id(sd.getSessionId()));
String userName = "-";
String accountId = "-";
if (user != null && user.isIdentifiedUser()) {
IdentifiedUser u = user.asIdentifiedUser();
userName = u.getUserName().orElse(null);
accountId = "a/" + u.getAccountId().toString();
} else if (user instanceof PeerDaemonUser) {
userName = PeerDaemonUser.USER_NAME;
}
event.setProperty(P_USER_NAME, userName);
event.setProperty(P_ACCOUNT_ID, accountId);
return event;
}
private static String id(int id) {
return HexFormat.fromInt(id);
}
void audit(Context ctx, Object result, String cmd) {
audit(ctx, result, cmd, null);
}
void audit(Context ctx, Object result, DispatchCommand cmd) {
audit(ctx, result, extractWhat(cmd), extractParameters(cmd));
}
private void audit(Context ctx, Object result, String cmd, ListMultimap params) {
String sessionId;
CurrentUser currentUser;
long created;
if (ctx == null) {
sessionId = null;
currentUser = null;
created = TimeUtil.nowMs();
} else {
SshSession session = ctx.getSession();
sessionId = HexFormat.fromInt(session.getSessionId());
currentUser = session.getUser();
created = ctx.created;
}
auditService.dispatch(new SshAuditEvent(sessionId, currentUser, cmd, created, params, result));
}
private String extractWhat(DispatchCommand dcmd) {
if (dcmd == null) {
return "Command was already destroyed";
}
StringBuilder commandName = new StringBuilder(dcmd.getCommandName());
String[] args = dcmd.getArguments();
for (int i = 1; i < args.length; i++) {
commandName.append(".").append(args[i]);
}
return commandName.toString();
}
@Override
public List configUpdated(ConfigUpdatedEvent event) {
ConfigKey sshdRequestLog = ConfigKey.create("sshd", "requestLog");
if (!event.isValueUpdated(sshdRequestLog)) {
return Collections.emptyList();
}
boolean stateUpdated;
try {
boolean enabled = event.getNewConfig().getBoolean("sshd", "requestLog", true);
if (enabled) {
stateUpdated = enableLogging();
} else {
stateUpdated = disableLogging();
}
return stateUpdated
? Collections.singletonList(event.accept(sshdRequestLog))
: Collections.emptyList();
} catch (IllegalArgumentException iae) {
return Collections.singletonList(event.reject(sshdRequestLog));
}
}
}
