import org.graylog2.plugin.logmessage.LogMessage

import java.util.regex.Matcher
import java.util.regex.Pattern

rule "ModSecurity Logging to GELF"

        // sample log line httpd: [error] [client a.b.c.d] ModSecurity: Warning. Operator LT matched 5 at TX:inbound_anomaly_score. [file "modsecurity_crs_60_correlation.conf"] [line "33"] [id "981203"] [msg "Inbound Anomaly Score (Total Inbound Score: 2, SQLi=, XSS=): Request Missing an Accept Header"] [hostname "www"] [uri "/index.php"] [unique_id "UUl6i38AAA"]        

        when
            m : LogMessage( facility == "local6", shortMessage matches "(?s).*ModSecurity:.*" )
        then
        Matcher matcher = Pattern.compile("\\[client (\\d+.\\d+.\\d+.\\d+)\\] .*?\\[id \"(.*?)\"\\] .*?\\[msg \"(.*?)\"\\]").matcher(m.getShortMessage());
        if (matcher.find()) {
            m.addAdditionalData("_SRC",matcher.group(1));
            m.addAdditionalData("_modsec_id",matcher.group(2));
            m.addAdditionalData("_modsec_msg",matcher.group(3));
        }
end


rule "Parsing Snort to GELF"

    //sample log line snort: [1:2402000:2907] ET DROP Dshield Block Listed Source [Classification: Misc Attack] [Priority: 2]: {TCP} a.b.c.d:24495 -> a.b.c.d:8081

    when
        m : LogMessage( facility == "local5" )
    then
        Matcher matcher = Pattern.compile("snort: +\\[(\\d+:\\d+:\\d+)\\] (.*?) \\[Classification:.*?\\] \\[Priority:.*?\\]: \\{(.*?)\\} (\\d+.\\d+.\\d+.\\d+):?(\\d*) -> (\\d+.\\d+.\\d+.\\d+):?(\\d*)").matcher(m.getShortMessage());
        if (matcher.find()) {
            m.addAdditionalData("_snort_id",matcher.group(1));
            m.addAdditionalData("_snort_msg",matcher.group(2));
            m.addAdditionalData("_PROTO",matcher.group(3));
            m.addAdditionalData("_SRC",matcher.group(4));
            m.addAdditionalData("_SPT",matcher.group(5));
            m.addAdditionalData("_DST",matcher.group(6));
            m.addAdditionalData("_DPT",matcher.group(7));
        }

end

rule "Parsing access_log to GELF"
        // sample log line httpd: a.b.c.d - - [21/Mar/2013:15:36:15 +0700] "GET /a/b.css.jsf?ln=primefaces-aristo HTTP/1.0" 304 - "http://www/index.jsf" "Mozilla/5.0 (Windows NT 5.1)" 1203 287

    when
        m : LogMessage( facility == "local4" )
    then
        Matcher matcher = Pattern.compile("httpd: +(\\d+.\\d+.\\d+.\\d+) .*?\"([A-Z]+) ([^\"]+) HTTP..?.?.?\" (\\d+) ([0-9-]+) \\\"([^\"]+)\\\" \\\"([^\"]+)\\\"").matcher(m.getShortMessage());
        if (matcher.find()) {
            m.addAdditionalData("_SRC",matcher.group(1));
            m.addAdditionalData("_verb",matcher.group(2));
            m.addAdditionalData("_request",matcher.group(3));
            m.addAdditionalData("_status",matcher.group(4));
            m.addAdditionalData("_referer",matcher.group(6));
            m.addAdditionalData("_ua",matcher.group(7));
        }
end 

rule "Parsing core switch"
    // sample log line 321533: Jun 26 08:11:17.164: %SEC-6-IPACCESSLOGP: list ACL1 denied udp a.b.c.d(6387) (TenGigabitEthernet1/1 x.y.z) -> a.b.c.d(137), 1 packet

    when
        m : LogMessage( shortMessage matches "(?s).*%SEC-6-IPACCESSLOGP.*" && facility == "local7" )
    then

        Matcher matcher = Pattern.compile("%SEC-6-IPACCESSLOGP: +list +([A-Za-z0-9\\-]+) +([a-zA-Z0-9]+) +([a-z]+) +(\\d+.\\d+.\\d+.\\d+)\\((\\d+)\\) +\\(([A-Za-z0-9/]+) +([0-9a-z\\.]*)\\) +-> +(\\d+.\\d+.\\d+.\\d+)\\((\\d+)\\), +(\\d+)").matcher(m.getShortMessage());
        if (matcher.find()) {
            m.addAdditionalData("_ACL",matcher.group(1));
            m.addAdditionalData("_PERM",matcher.group(2));
            m.addAdditionalData("_PROTO",matcher.group(3));
            m.addAdditionalData("_SRC",matcher.group(4));
            m.addAdditionalData("_SPT",matcher.group(5));
            m.addAdditionalData("_INT",matcher.group(6));
            m.addAdditionalData("_MAC",matcher.group(7));
            m.addAdditionalData("_DST",matcher.group(8));
            m.addAdditionalData("_DPT",matcher.group(9));
            m.addAdditionalData("_COUNT",matcher.group(10));

        }

end

rule "Parsing ASA log 106023 to GELF"
// sample SA-4-106023: Deny tcp src XXX:a.b.c.d/41258 dst YYY:a.b.c.d/1051 by access-group "XXXX"
    when
        m : LogMessage( facility == "local4" && shortMessage matches "(?s).*%ASA-[0-9]-106023:.*" )
    then
        #System.out.println("[m]"+m.getShortMessage()+"[/m]");
        Matcher matcher = Pattern.compile("%ASA-([0-9])-([0-9]+): +Deny +([A-Za-z ]+) +src +([A-Za-z_0-9-]+):(\\d+\\.\\d+\\.\\d+\\.\\d+)/(\\d+) [A-Za-z ]+ ([A-Za-z_0-9-]+):(\\d+\\.\\d+\\.\\d+\\.\\d+)/(\\d+) by access-group \"([A-Za-z_0-9-]+)\"").matcher(m.getShortMessage());
        if (matcher.find()) {
            m.addAdditionalData("_LVL",matcher.group(1));
            m.addAdditionalData("_MSGID",matcher.group(2));
            m.addAdditionalData("_PROTO",matcher.group(3));
            m.addAdditionalData("_SNAME",matcher.group(4));
            m.addAdditionalData("_SRC",matcher.group(5));
            m.addAdditionalData("_SPT",matcher.group(6));
            m.addAdditionalData("_DNAME",matcher.group(7));
            m.addAdditionalData("_DST",matcher.group(8));
            m.addAdditionalData("_DPT",matcher.group(9));
            m.addAdditionalData("_ACL",matcher.group(10));
        }
end 


rule "Parsing other ASA log to GELF"
    when
        m : LogMessage( facility == "local4" && shortMessage not matches "(?s)%ASA-[0-9]-(106023):.*" )
    then
        Matcher matcher = Pattern.compile("%ASA-([0-9])-([0-9]+): (.*)").matcher(m.getShortMessage());
        if (matcher.find()) {
            m.addAdditionalData("_LVL",matcher.group(1));
            m.addAdditionalData("_MSGID",matcher.group(2));
            m.addAdditionalData("_MSG",matcher.group(3));
        }
end