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Add a field to Modbus/TCP log to indicate the Modbus PDU type

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Add the `pdu_type` field to Modbus over TCP logs to indicate whether the Modbus
message was a request or a response. Due to the client/server nature of Modbus
over TCP/IP, all messages from the TCP session originator are requests, while
all messages from the TCP session responder are responses.

Adding this information to the default log surfaces protocol metadata in a way
that doesn't require users to understand the Modbus over TCP protocol.
This commit is contained in:
Michael Torres 2022-07-17 21:18:50 +00:00
parent bab2036aa4
commit b85801aa7e
4 changed files with 40000 additions and 39995 deletions
Download patch file Download diff file Expand all files Collapse all files

5
scripts/base/protocols/modbus/main.zeek
View file

@ -22,6 +22,8 @@ export {
unit: count &log &optional;
## The name of the function message that was sent.
func: string &log &optional;
## Whether this PDU was a response ("RESP") or request ("REQ")
pdu_type: string &log &optional;
## The exception if the response was a failure.
exception: string &log &optional;
};
@ -55,6 +57,9 @@ event modbus_message(c: connection, headers: ModbusHeaders, is_orig: bool) &prio
c$modbus$tid = headers$tid;
c$modbus$unit = headers$uid;
c$modbus$func = function_codes[headers$function_code];
## If this message is from the TCP originator, it is a request. Otherwise,
## it is a response.
c$modbus$pdu_type = is_orig ? "REQ" : "RESP";
}
event modbus_message(c: connection, headers: ModbusHeaders, is_orig: bool) &priority=-5

34
testing/btest/Baseline/scripts.base.protocols.modbus.exception_handling/modbus.log
View file

@ -5,21 +5,21 @@
#unset_field -
#path modbus
#open XXXX-XX-XX-XX-XX-XX
#fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p tid unit func exception
#types time string addr port addr port count count string string
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-156 -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-29 -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-160 -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-33 -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 0 WRITE_SINGLE_REGISTER -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-162 -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 21504 1 unknown-35 -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-36 -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-37 -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 0 unknown-38 -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-175 -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-179 -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 12032 0 unknown-0 -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 0 unknown-0 -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-165 -
#fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p tid unit func pdu_type exception
#types time string addr port addr port count count string string string
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-156 RESP -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-29 REQ -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-160 RESP -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-33 REQ -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 0 WRITE_SINGLE_REGISTER REQ -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-162 RESP -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 21504 1 unknown-35 REQ -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-36 REQ -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-37 REQ -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 0 unknown-38 REQ -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-175 RESP -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-179 RESP -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 12032 0 unknown-0 REQ -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 0 unknown-0 REQ -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.66.235 2582 166.161.16.230 502 0 1 unknown-165 RESP -
#close XXXX-XX-XX-XX-XX-XX

79942
testing/btest/Baseline/scripts.base.protocols.modbus.policy/modbus.log
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File diff suppressed because it is too large Load diff

14
testing/btest/Baseline/scripts.base.protocols.modbus.register_parsing/modbus.log
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@ -5,11 +5,11 @@
#unset_field -
#path modbus
#open XXXX-XX-XX-XX-XX-XX
#fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p tid unit func exception
#types time string addr port addr port count count string string
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 10.1.1.234 51411 10.10.5.104 502 1119 255 READ_INPUT_REGISTERS -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 10.1.1.234 51411 10.10.5.104 502 2606 255 READ_INPUT_REGISTERS -
XXXXXXXXXX.XXXXXX ClEkJM2Vm5giqnMf4h 10.1.1.234 51411 10.10.5.104 502 6714 255 READ_INPUT_REGISTERS -
XXXXXXXXXX.XXXXXX C4J4Th3PJpwUYZZ6gc 10.1.1.234 51411 10.10.5.104 502 12993 255 READ_INPUT_REGISTERS -
XXXXXXXXXX.XXXXXX CtPZjS20MLrsMUOJi2 10.1.1.234 51411 10.10.5.104 502 17667 255 READ_INPUT_REGISTERS -
#fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p tid unit func pdu_type exception
#types time string addr port addr port count count string string string
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 10.1.1.234 51411 10.10.5.104 502 1119 255 READ_INPUT_REGISTERS REQ -
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 10.1.1.234 51411 10.10.5.104 502 2606 255 READ_INPUT_REGISTERS RESP -
XXXXXXXXXX.XXXXXX ClEkJM2Vm5giqnMf4h 10.1.1.234 51411 10.10.5.104 502 6714 255 READ_INPUT_REGISTERS RESP -
XXXXXXXXXX.XXXXXX C4J4Th3PJpwUYZZ6gc 10.1.1.234 51411 10.10.5.104 502 12993 255 READ_INPUT_REGISTERS REQ -
XXXXXXXXXX.XXXXXX CtPZjS20MLrsMUOJi2 10.1.1.234 51411 10.10.5.104 502 17667 255 READ_INPUT_REGISTERS RESP -
#close XXXX-XX-XX-XX-XX-XX