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- #
- # p0f - RST+ signatures
- # ---------------------
- #
- # .-------------------------------------------------------------------------.
- # | The purpose of this file is to cover signatures for reset packets |
- # | (RST and RST+ACK). This mode of operation can be enabled with -A option |
- # | and is considered to be least accurate. Please refer to p0f.fp for more |
- # | information on the metrics used and for a guide on adding new entries |
- # | to this file. This database is looking for a caring maintainer. |
- # `-------------------------------------------------------------------------'
- #
- # (C) Copyright 2000-2004 by Michal Zalewski <lcamtuf@coredump.cx>
- #
- # Submit all additions to the authors. Read p0f.fp before adding any
- # signatures. Run p0f -R -C after making any modifications. This file is
- # NOT compatible with SYN, SYN+ACK, or stray ACK modes. Use only with -R
- # option.
- #
- # IMPORTANT INFORMATION ABOUT THE INTERDEPENDENCY OF SYNs AND RST+ACKs
- # --------------------------------------------------------------------
- #
- # Some silly systems may copy WSS from the SYN packet you've sent,
- # in which case, you need to wildcard the value. Use test/sendsyn.c for
- # "connection refused" and test/sendack.c for "connection dropped" signatures
- # - both tools use a distinct WSS of 12345, which is an easy way to tell
- # if WSS should be wildcarded.
- #
- # IMPORTANT INFORMATION ABOUT COMMON IMPLEMENTATION FLAWS
- # -------------------------------------------------------
- #
- # There are several types of RST packets you will surely encounter.
- # Some systems, including most reputable ones, are severily brain-damaged
- # and generate some illegal combinations from time to time. This is WAY
- # more common than with other packet types, because a broken RST does not
- # have any immediately noticable consequences; besides, the RFC793 is fairly
- # difficult to comprehend when it comes to this type of responses.
- #
- # P0f will give you a hint on new RST signatures, but it is your duty to
- # diagnose the problem and append the proper description when adding the
- # signature. Below is a list of valid and invalid states:
- #
- # - "Connection refused" message: this is a RST+ACK packet, SEQ number
- # set to zero, ACK number non-zero. This is a valid response and
- # is denoted by p0f as "refused" (quirk combination: K, 0, A).
- #
- # There are some very cases when this is incorrectly sent in response
- # to an unexpected ACK packet.
- #
- # - Illegal combination: RST+ACK packet, SEQ number set to zero, ACK
- # number zero. This is denoted by p0f as "invalid-K0" (quirk combination:
- # K and 0, no A).
- #
- # - Illegal combination: RST+ACK, SEQ number non-zero, ACK number zero
- # or non-zero. This is denoted by p0f as "invalid-K" and
- # "invalid-KA", respectively (quirk combinations, K, sometimes A, no 0).
- #
- # This combination is frequently generated by Cisco routers in certain
- # configurations in response to ACK (!). Brain dead, by all means, and
- # usually a result of (incorrectly) setting ACK flag on a valid RST packet.
- #
- # - "Connection dropped": RST, sequence number non-zero, ACK zero or
- # non-zero. This is denoted as "dropped" and "dropped 2" respectively
- # (quirk combinations: no K, sometimes A, no 0). While the ACK value should
- # be zeroed, it is not strictly against the RFC, and some systems either
- # leak memory there or set it to the value of SEQ.
- #
- # The latter variant, with non-zero ACK, is particularly common on
- # Windows.
- #
- # - Ilegal combination: RST, SEQ number zero, ACK zero or non-zero.
- # Denoted as "invalid-0" and "invalid-0A". Obviously incorrect, and
- # will not have the desired effect.
- #
- # Ok. That's it. RFC793 does not get much respect nowadays.
- #
- # IMPORTANT INFORMATION ABOUT DIFFERENCES IN COMPARISON TO p0f.fp:
- # ----------------------------------------------------------------
- #
- # - Packet size may be wildcarded. The meaning of wildcard is, however,
- # hardcoded as 'size > PACKET_BIG' (defined as 100 in config.h). This is
- # because some stupid devices (including Ciscos) tend to send back RST
- # packets quoting anything you have sent them in ACK packet previously.
- # Use sparingly, only if -X confirms the device actually bounces back
- # whatever you send.
- #
- # - A new quirk, 'K', is introduced to denote RST+ACK packets (as opposed
- # to plain RST). This quirk is only compatible with this mode.
- #
- # - A new quirk, 'Q', is used to denote SEQ number equal to ACK number.
- # This happens from time to time in RST and RST+ACK packets, but
- # is practically unheard of in other modes.
- #
- # - A new quirk, '0', is used to denote packets with SEQ number set to 0.
- # This happens on some RSTs, and is once again unheard of in other modes.
- #
- # - 'D' quirk is not a bug; some devices send verbose text messages
- # describing why a connection got dropped; it's actually suggested
- # by RFC1122. Of course, some systems have their own standards, and
- # put all kinds of crap in their RST responses (including FreeBSD and
- # Cisco). Use -X to examine those values.
- #
- # - 'A' and 'T' quirks are not an anomaly in certain cases for the reasons
- # described in p0fa.fp.
- #
-
- ################################
- # Connection refused - RST+ACK #
- ################################
-
- 0:255:0:40:.:K0A:Linux:2.0/2.2 (refused)
- 0:64:1:40:.:K0A:FreeBSD:4.8 (refused)
- 0:64:1:40:.:K0ZA:Linux:recent 2.4 (refused)
-
- 0:128:0:40:.:K0A:Windows:XP/2000 (refused)
- 0:128:0:40:.:K0UA:-Windows:XP/2000 while browsing (refused)
-
- ######################################
- # Connection dropped / timeout - RST #
- ######################################
-
- 0:64:1:40:.:.:FreeBSD:4.8 (dropped)
- 0:255:0:40:.:.:Linux:2.0/2.2 or IOS 12.x (dropped)
- 0:64:1:40:.:Z:Linux:recent 2.4 (dropped)
- 0:255:1:40:.:Z:Linux:early 2.4 (dropped)
- 0:32:0:40:.:.:Xylan:OmniSwitch / Linksys WAP11 AP (dropped)
- 0:64:1:40:.:U:NetIron:load balancer (dropped)
-
- 0:128:1:40:.:QA:Windows:XP/2000 (dropped 2)
- 0:128:1:40:.:A:-Windows:XP/2000 while browsing (1) (dropped 2)
- 0:128:1:40:.:QUA:-Windows:XP/2000 while browsing (2) (dropped 2)
- 0:128:1:40:.:UA:-Windows:XP/2000 while browsing a lot (dropped 2)
- 0:128:1:40:.:.:@Windows:98 (?) (dropped)
-
- 0:64:0:40:.:A:Ascend:TAOS or BayTech (dropped 2)
-
- *:255:0:40:.:QA:Cisco:LocalDirector (dropped 2)
-
- 0:64:1:40:.:A:Hasbani:WindWeb (dropped 2)
- S23:255:1:40:.:.:Solaris:2.5 (dropped)
-
- #######################################################
- # Connection dropped / timeout - RST with description #
- #######################################################
-
- 0:255:1:58:.:D:MacOS:9.x "No TCP/No listener" (seldom SunOS 5.x) (dropped)
- 0:255:1:53:.:D:MacOS:8.5 "no tcp, reset" (dropped)
- 0:255:1:65:.:D:MacOS:X "tcp_close, during connect" (dropped)
- 0:255:1:54:.:D:MacOS:X "tcp_disconnect" (dropped)
- 0:255:1:62:.:D:HP/UX:? "tcp_fin_wait_2_timeout" (dropped)
- 32768:255:1:54:.:D:MacOS:8.5 "tcp_disconnect" (dropped)
- 0:255:1:63:.:D:@Unknown: "Go away" device (dropped)
-
- 0:255:0:62:.:D:SunOS:5.x "new data when detached" (1) (dropped)
- 32768:255:1:62:.:D:SunOS:5.x "new data when detached" (2) (dropped)
- 0:255:1:67:.:D:SunOS:5.x "tcp_lift_anchor, can't wait" (dropped)
-
- 0:255:0:46:.:D:HP/UX:11.00 "No TCP" (dropped)
-
- # More obscure ones:
- # 648:255:1:54:.:D:MacOS:??? "tcp_disconnect" (dropped)
- # 0:45:1:53:.:D:MacOS:7.x "no tcp, reset" (dropped)
-
- ##############################################
- # Connection dropped / timeout - broken RSTs #
- ##############################################
-
- S12:255:1:58:.:KAD:Solaris:2.x "tcp_disconnect" (dropped, lame)
- S43:64:1:40:.:KA:AOL:proxy (dropped, lame)
- *:64:1:40:.:KA:FreeBSD:4.8 (dropped, lame)
- *:64:1:52:N,N,T:KAT:Linux:2.4 (?) (dropped, lame)
- 0:255:0:40:.:KAF:3Com:SuperStack II (dropped, lame)
- *:255:0:40:.:KA:Intel:Netport print server (dropped, lame)
- *:150:0:40:.:KA:Linksys:BEF router (dropped, lame)
-
- *:32:0:44:.:KZD:@NetWare:??? "ehnc" (dropped, lame)
- 0:64:0:40:.:KQ0:BayTech:RPC-3 telnet host (dropped, lame)
-
- #############################################
- # Connection dropped / timeout - extra data #
- #############################################
-
- *:255:0:*:.:KAD:Cisco:IOS/PIX NAT + data (1) (dropped, lame)
- 0:255:0:*:.:D:Windows:NT 4.0 SP6a + data (dropped)
- 0:255:0:*:.:K0AD:Isolation:Infocrypt accelerator + data (dropped, lame)
-
- *:255:0:*:.:AD:Cisco:IOS/PIX NAT + data (2) (dropped)
-
- *:64:1:*:N,N,T:KATD:Linux:2.4 (?) + data (dropped, lame)
- *:64:1:*:.:KAD:FreeBSD:4.8 + data (dropped, lame)
-
-
-
-