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/*
* Copyright (C) 2020 Graylog, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* .
*/
package org.graylog2.inputs.codecs;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.Timer;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.net.InetAddresses;
import com.google.inject.assistedinject.Assisted;
import com.google.inject.assistedinject.AssistedInject;
import org.graylog2.plugin.Message;
import org.graylog2.plugin.ResolvableInetSocketAddress;
import org.graylog2.plugin.Tools;
import org.graylog2.plugin.configuration.Configuration;
import org.graylog2.plugin.configuration.ConfigurationRequest;
import org.graylog2.plugin.configuration.fields.BooleanField;
import org.graylog2.plugin.inputs.annotations.Codec;
import org.graylog2.plugin.inputs.annotations.ConfigClass;
import org.graylog2.plugin.inputs.annotations.FactoryClass;
import org.graylog2.plugin.inputs.codecs.AbstractCodec;
import org.graylog2.plugin.inputs.codecs.CodecAggregator;
import org.graylog2.plugin.inputs.transports.NettyTransport;
import org.graylog2.plugin.journal.RawMessage;
import org.graylog2.syslog4j.server.SyslogServerEventIF;
import org.graylog2.syslog4j.server.impl.event.CiscoSyslogServerEvent;
import org.graylog2.syslog4j.server.impl.event.FortiGateSyslogEvent;
import org.graylog2.syslog4j.server.impl.event.SyslogServerEvent;
import org.graylog2.syslog4j.server.impl.event.structured.StructuredSyslogServerEvent;
import org.joda.time.DateTime;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.inject.Inject;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.nio.charset.StandardCharsets;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern;
import static com.codahale.metrics.MetricRegistry.name;
import static com.google.common.base.Strings.isNullOrEmpty;
@Codec(name = "syslog", displayName = "Syslog")
public class SyslogCodec extends AbstractCodec {
private static final Logger LOG = LoggerFactory.getLogger(SyslogCodec.class);
private static final Pattern STRUCTURED_SYSLOG_PATTERN = Pattern.compile("<\\d{1,3}>[0-9]\\d{0,2}\\s.*", Pattern.DOTALL);
private static final Pattern CISCO_WITH_SEQUENCE_NUMBERS_PATTERN = Pattern.compile("<\\d{1,3}>\\d*:\\s.*", Pattern.DOTALL);
private static final Pattern FORTIGATE_PATTERN = Pattern.compile("<\\d{1,3}>date=.*", Pattern.DOTALL);
static final String CK_FORCE_RDNS = "force_rdns";
static final String CK_ALLOW_OVERRIDE_DATE = "allow_override_date";
static final String CK_EXPAND_STRUCTURED_DATA = "expand_structured_data";
static final String CK_STORE_FULL_MESSAGE = "store_full_message";
private final Timer resolveTime;
private final Timer decodeTime;
@AssistedInject
public SyslogCodec(@Assisted Configuration configuration, MetricRegistry metricRegistry) {
super(configuration);
this.resolveTime = metricRegistry.timer(name(SyslogCodec.class, "resolveTime"));
this.decodeTime = metricRegistry.timer(name(SyslogCodec.class, "decodeTime"));
}
@Nullable
@Override
public Message decode(@Nonnull RawMessage rawMessage) {
final String msg = new String(rawMessage.getPayload(), charset);
try (Timer.Context ignored = this.decodeTime.time()) {
final ResolvableInetSocketAddress address = rawMessage.getRemoteAddress();
final InetSocketAddress remoteAddress;
if (address == null) {
remoteAddress = null;
} else {
remoteAddress = address.getInetSocketAddress();
}
return parse(msg, remoteAddress == null ? null : remoteAddress.getAddress(), rawMessage.getTimestamp());
}
}
private Message parse(String msg, InetAddress remoteAddress, DateTime receivedTimestamp) {
/*
* ZOMG funny 80s neckbeard protocols. We are now deciding if to parse
* structured (RFC5424) or unstructured (classic BSD, RFC3164) syslog
* by checking if there is a VERSION after the PRI. Sorry.
*
* ._. _
* R-O-F-L-R-O-F-L-R-O-F-L-IOI-R-O-F-L-R-O-F-L-R-O-F-L / l
* ___________/LOL\____ /: ]
* .__/° °\___/° \ / ::\
* /^^ \ ° ° \_______.__________.____/: OO:\
* .__./ j ________ _________________ ::OO::|
* ./ ^^ j____/° [\______/] .____/ \__:__/
* ._|____/° ° <{(OMG{< / ::
* / ° ° (OMFG{ /
* |° loooooooooooooooooooooooooooooooool
* °L| L|
* () ()
*
*
* http://open.spotify.com/track/2ZtQKBB8wDTtPPqDZhy7xZ
*
*/
final SyslogServerEventIF e;
if (STRUCTURED_SYSLOG_PATTERN.matcher(msg).matches()) {
e = new StructuredSyslogServerEvent(msg, remoteAddress);
} else if (CISCO_WITH_SEQUENCE_NUMBERS_PATTERN.matcher(msg).matches()) {
e = new CiscoSyslogServerEvent(msg, remoteAddress);
} else if (FORTIGATE_PATTERN.matcher(msg).matches()) {
e = new FortiGateSyslogEvent(msg);
} else {
e = new SyslogServerEvent(msg, remoteAddress);
}
// If the message is a structured one, we do not want the message ID and the structured data in the
// message string. See: https://github.com/Graylog2/graylog2-server/issues/845#issuecomment-69499719
final String syslogMessage;
if (e instanceof StructuredSyslogServerEvent) {
final String structMessage = ((StructuredSyslogServerEvent) e).getStructuredMessage().getMessage();
syslogMessage = isNullOrEmpty(structMessage) ? e.getMessage() : structMessage;
} else {
syslogMessage = e.getMessage();
}
final Message m = new Message(syslogMessage, parseHost(e, remoteAddress), parseDate(e, receivedTimestamp));
m.addField("facility", Tools.syslogFacilityToReadable(e.getFacility()));
m.addField("level", e.getLevel());
m.addField("facility_num", e.getFacility());
// I can haz pattern matching?
if (e instanceof CiscoSyslogServerEvent) {
m.addField("sequence_number", ((CiscoSyslogServerEvent) e).getSequenceNumber());
}
if (e instanceof FortiGateSyslogEvent) {
final HashMap fields = new HashMap<>(((FortiGateSyslogEvent) e).getFields());
// The FortiGate "level" field is a string, Graylog requires a numeric value.
fields.remove("level");
m.addFields(fields);
}
// Store full message if configured.
if (configuration.getBoolean(CK_STORE_FULL_MESSAGE)) {
m.addField("full_message", new String(e.getRaw(), charset));
}
final boolean expandStructuredData = configuration.getBoolean(CK_EXPAND_STRUCTURED_DATA);
m.addFields(parseAdditionalData(e, expandStructuredData));
return m;
}
private Map parseAdditionalData(SyslogServerEventIF msg, boolean expand) {
// Structured syslog has more data we can parse.
if (msg instanceof StructuredSyslogServerEvent) {
final StructuredSyslogServerEvent sMsg = (StructuredSyslogServerEvent) msg;
final Map structuredData = new HashMap<>(extractFields(sMsg, expand));
if (!isNullOrEmpty(sMsg.getApplicationName())) {
structuredData.put("application_name", sMsg.getApplicationName());
}
if (!isNullOrEmpty(sMsg.getProcessId())) {
structuredData.put("process_id", sMsg.getProcessId());
}
return structuredData;
} else {
return Collections.emptyMap();
}
}
private String parseHost(SyslogServerEventIF msg, InetAddress remoteAddress) {
if (remoteAddress != null && configuration.getBoolean(CK_FORCE_RDNS)) {
try (Timer.Context ignored = this.resolveTime.time()) {
return Tools.rdnsLookup(remoteAddress);
} catch (UnknownHostException e) {
LOG.warn("Reverse DNS lookup failed. Falling back to parsed hostname.", e);
}
}
final String host = msg.getHost();
return isNullOrEmpty(host) && remoteAddress != null ? InetAddresses.toAddrString(remoteAddress) : host;
}
private DateTime parseDate(SyslogServerEventIF msg, DateTime receivedTimestamp) throws IllegalStateException {
// Check if date could be parsed.
if (msg.getDate() == null) {
if (configuration.getBoolean(CK_ALLOW_OVERRIDE_DATE)) {
LOG.debug("Date could not be parsed. Was set to NOW because {} is true.", CK_ALLOW_OVERRIDE_DATE);
return receivedTimestamp;
} else {
LOG.warn("Syslog message is missing date or date could not be parsed. (Possibly set {} to true) "
+ "Not further handling. Message was: {}",
CK_ALLOW_OVERRIDE_DATE, new String(msg.getRaw(), charset));
throw new IllegalStateException("Syslog message is missing date or date could not be parsed.");
}
}
return new DateTime(msg.getDate());
}
@Nullable
@Override
public CodecAggregator getAggregator() {
return null;
}
@FactoryClass
public interface Factory extends AbstractCodec.Factory {
@Override
SyslogCodec create(Configuration configuration);
@Override
Config getConfig();
@Override
Descriptor getDescriptor();
}
@ConfigClass
public static class Config extends AbstractCodec.Config {
@Override
public ConfigurationRequest getRequestedConfiguration() {
final ConfigurationRequest r = super.getRequestedConfiguration();
r.addField(
new BooleanField(
CK_FORCE_RDNS,
"Force rDNS?",
false,
"Force rDNS resolution of hostname? Use if hostname cannot be parsed. (Be careful if you are sending DNS logs into this input because it can cause a feedback loop.)"
)
);
r.addField(
new BooleanField(
CK_ALLOW_OVERRIDE_DATE,
"Allow overriding date?",
true,
"Allow to override with current date if date could not be parsed?"
)
);
r.addField(
new BooleanField(
CK_STORE_FULL_MESSAGE,
"Store full message?",
false,
"Store the full original syslog message as full_message?"
)
);
r.addField(
new BooleanField(
CK_EXPAND_STRUCTURED_DATA,
"Expand structured data?",
false,
"Expand structured data elements by prefixing attributes with their SD-ID?"
)
);
return r;
}
@Override
public void overrideDefaultValues(@Nonnull ConfigurationRequest cr) {
if (cr.containsField(NettyTransport.CK_PORT)) {
cr.getField(NettyTransport.CK_PORT).setDefaultValue(514);
}
}
}
public static class Descriptor extends AbstractCodec.Descriptor {
@Inject
public Descriptor() {
super(SyslogCodec.class.getAnnotation(Codec.class).displayName());
}
}
@SuppressWarnings("unchecked")
@VisibleForTesting
Map extractFields(final StructuredSyslogServerEvent msg, final boolean expand) {
try {
final Map> raw = msg.getStructuredMessage().getStructuredData();
if (raw != null && !raw.isEmpty()) {
final Map fields = new HashMap<>();
for (Map.Entry> entry : raw.entrySet()) {
if (expand) {
fields.putAll(prefixElements(entry.getKey(), entry.getValue()));
} else {
fields.putAll(entry.getValue());
}
}
return fields;
}
} catch (Exception e) {
LOG.debug("Could not extract structured syslog", e);
}
return Collections.emptyMap();
}
private Map prefixElements(final String prefix, final Map elements) {
if (elements == null || elements.isEmpty()) {
return Collections.emptyMap();
}
final Map prefixedMap = new HashMap<>(elements.size());
for (Map.Entry entry : elements.entrySet()) {
prefixedMap.put(prefix.trim() + "_" + entry.getKey(), entry.getValue());
}
return prefixedMap;
}
}
