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rfb: never return error on unknown traffic
We only try to parse a small subset of what is possible in RFB. Currently we only understand some standard auth schemes and stop parsing when the server-client handshake is complete. Since in IPS mode returning an error from the parser causes drops that are likely uncalled for, we do not want to return errors when we simply do not understand what happens in the traffic. This addresses Redmine OISF#5912.
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,10 @@ | ||
# RFB app-layer event rules. | ||
# | ||
# These SIDs fall in the 2233000+ range. See: | ||
# http://doc.emergingthreats.net/bin/view/Main/SidAllocation and | ||
# https://redmine.openinfosecfoundation.org/projects/suricata/wiki/AppLayer | ||
|
||
alert rfb any any -> any any (msg:"SURICATA RFB Malformed or unknown message"; app-layer-event:rfb.malformed_message; classtype:protocol-command-decode; sid:2233000; rev:1;) | ||
alert rfb any any -> any any (msg:"SURICATA RFB Unimplemented security type"; app-layer-event:rfb.unimplemented_security_type; classtype:protocol-command-decode; sid:2233001; rev:1;) | ||
alert rfb any any -> any any (msg:"SURICATA RFB Unknown security result"; app-layer-event:rfb.unknown_security_result; classtype:protocol-command-decode; sid:2233002; rev:1;) | ||
alert rfb any any -> any any (msg:"SURICATA RFB Unexpected State in Parser"; app-layer-event:rfb.confused_state; classtype:protocol-command-decode; sid:2233003; rev:1;) |
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Original file line number | Diff line number | Diff line change |
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@@ -20,4 +20,4 @@ | |
pub mod detect; | ||
pub mod logger; | ||
pub mod parser; | ||
pub mod rfb; | ||
pub mod rfb; |
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