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From GitBox <...@apache.org>
Subject [GitHub] [metron] mmiklavc commented on a change in pull request #1408: METRON-2118: Added a LEEF parser
Date Fri, 17 May 2019 20:57:23 GMT
mmiklavc commented on a change in pull request #1408: METRON-2118: Added a LEEF parser
URL: https://github.com/apache/metron/pull/1408#discussion_r285286533
 
 

 ##########
 File path: metron-platform/metron-parsing/metron-parsers/src/main/java/org/apache/metron/parsers/leef/LEEFParser.java
 ##########
 @@ -0,0 +1,236 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.apache.metron.parsers.leef;
+
+import java.lang.invoke.MethodHandles;
+import java.nio.charset.Charset;
+import java.text.SimpleDateFormat;
+import java.time.Clock;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.apache.metron.parsers.BasicParser;
+import org.apache.metron.parsers.ParseException;
+import org.apache.metron.parsers.cef.CEFParser;
+import org.apache.metron.parsers.utils.DateUtils;
+import org.apache.metron.parsers.utils.SyslogUtils;
+import org.json.simple.JSONObject;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class LEEFParser extends BasicParser {
+	private static final long serialVersionUID = 1L;
+
+	protected static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+	private static final String HEADER_CAPTURE_PATTERN = "[^\\|]*";
+	private static final Charset UTF_8 = Charset.forName("UTF-8");
+	private static final String EXTENSION_CAPTURE_PATTERN = "(?<!\\\\)=";
+
+	private Pattern p;
+	private Pattern pext;
+
+	public void init() {
+
+		// CEF Headers: Device Vendor|Device Product|Device Version|Device Event
+		// Class ID|Name|Severity
+
+		String syslogTime = "(?:Jan(?:uary)?|Feb(?:ruary)?|Mar(?:ch)?|Apr(?:il)?|May|Jun(?:e)?|Jul(?:y)?|Aug(?:ust)?|Sep(?:tember)?|Oct(?:ober)?|Nov(?:ember)?|Dec(?:ember)?)\\b
+(?:(?:0[1-9])|(?:[12][0-9])|(?:3[01])|[1-9]) (?!<[0-9])(?:2[0123]|[01]?[0-9]):(?:[0-5][0-9])(?::(?:(?:[0-5]?[0-9]|60)(?:[:.,][0-9]+)?))(?![0-9])?";
+		String syslogTime5424 = "(?:\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}(?:\\.\\d+)?(?:Z|[+-]\\d{2}:\\d{2}))";
+		String syslogPriority = "<(?:[0-9]+)>";
+		String syslogHost = "[a-z0-9\\.\\\\-_]+";
+
+		StringBuilder sb = new StringBuilder("");
+		sb.append("(?<syslogPriority>");
+		sb.append(syslogPriority);
+		sb.append(")?");
+		sb.append("(?<syslogTime>");
+		sb.append(syslogTime);
+		sb.append("|");
+		sb.append(syslogTime5424);
+		sb.append(")?");
+
+		sb.append("(?<syslogHost>");
+		sb.append(syslogHost);
+		sb.append(")?");
+
+		sb.append(".*");
+
+		sb.append("LEEF:(?<Version>1.0|2.0|0)?\\|");
+
+		headerBlock("DeviceVendor", sb);
+		sb.append("\\|");
+		headerBlock("DeviceProduct", sb);
+		sb.append("\\|");
+		headerBlock("DeviceVersion", sb);
+		sb.append("\\|");
+		headerBlock("DeviceEvent", sb);
+		sb.append("\\|");
+		
+		// add optional delimiter header (only applicable for LEEF 2.0)
+		sb.append("(");
+		headerBlock("Delimiter", sb);
+		sb.append("\\|");
+		sb.append(")?");
+		
+		// extension capture:
+		sb.append(" ?(?<extensions>.*)");
+		String pattern = sb.toString();
+
+		p = Pattern.compile(pattern);
+
+		pext = Pattern.compile(EXTENSION_CAPTURE_PATTERN);
+	}
+
+	@SuppressWarnings("unchecked")
+	public List<JSONObject> parse(byte[] rawMessage) {
+		List<JSONObject> messages = new ArrayList<>();
+
+		String cefString = new String(rawMessage, UTF_8);
+
+		Matcher matcher = p.matcher(cefString);
+
+		while (matcher.find()) {
+			JSONObject obj = new JSONObject();
+			if (!matcher.matches()) {
+				break;
+			}
+			LOG.debug("Found %d groups", matcher.groupCount());
+			obj.put("DeviceVendor", matcher.group("DeviceVendor"));
+			obj.put("DeviceProduct", matcher.group("DeviceProduct"));
+			obj.put("DeviceVersion", matcher.group("DeviceVersion"));
+			obj.put("DeviceEvent", matcher.group("DeviceEvent"));
+			
+			String ext = matcher.group("extensions");
+
+			// In LEEF 2.0 the delimiter can be specified
+			String version = matcher.group("Version");
+			if (version.equals("2.0")) {
+				String delimiter = matcher.group("Delimiter");
+				if (delimiter == null || delimiter.length() == 0) {
+					delimiter = "\\t";
+				}
+				delimiter = "(?<!\\\\)[" + delimiter.replace("^", "\\^").replace("\t", "\\t") + "]";
+				
+				String[] kvs = ext.split(delimiter); 
+				for (String kv: kvs) {
+					String[] a = kv.split("=");
+					obj.put(a[0], a[1]);
+				}
+			} else if (version.equals("1.0") || version.isEmpty()) {
+				// TODO - Support LEEF 1.0 delimiters
+				String delimiter = "\t";
+				String[] kvs = ext.split(delimiter);
+				for (String kv: kvs) {
+					String[] a = kv.split("=");
+					obj.put(a[0], a[1]);
+				}
+			} else {
+				// Found in the wild examples using CEF rules, which need to handle the processing per
the CEFParser
+				// Note that technically LEEF does not support the CEF approach to numbered custom variables.
+				// We however do here, due to some found in the wild exceptions to the standard.
+				CEFParser.parseExtensions(ext, obj);
+			}
+
+			// Rename standard CEF fields to comply with Metron standards
+			obj = mutate(obj, "dst", "ip_dst_addr");
+			obj = mutate(obj, "dstPort", "ip_dst_port");
+			obj = convertToInt(obj, "ip_dst_port");
+
+			obj = mutate(obj, "src", "ip_src_addr");
+			obj = mutate(obj, "srcPort", "ip_src_port");
+			obj = convertToInt(obj, "ip_src_port");
+
+			obj.put("original_string", cefString);
 
 Review comment:
   > This can probably be removed after your PR, though there is also an argument to follow
on from your PR with a general clean-up of all the out of the box parsers, which feels like
a separate unit of work to me. Should this stand for consistency right now, and wait for yours
to go in then follow on as part of the general cleaning? Otherwise yours will have to be in
before this in order for tests to pass.
   
   That sounds good - re: keep your original_string as is for now (though, do reference the
constant fields)

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