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fix: incorrect verdict handling that caused packets to pass through even after they had been blocked (#52)

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Toby 2024-02-11 13:05:05 -08:00 committed by GitHub
parent 27c9b91a61
commit 6d33a0d51c
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GPG Key ID: B5690EEEBB952194
2 changed files with 25 additions and 9 deletions
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17
engine/tcp.go
View File

@ -65,7 +65,7 @@ func (f *tcpStreamFactory) New(ipFlow, tcpFlow gopacket.Flow, tcp *layers.TCP, a
ctx.Verdict = tcpVerdictAcceptStream
f.Logger.TCPStreamAction(info, ruleset.ActionAllow, true)
// a tcpStream with no activeEntries is a no-op
return &tcpStream{}
return &tcpStream{finalVerdict: tcpVerdictAcceptStream}
}
// Create entries for each analyzer
entries := make([]*tcpStreamEntry, 0, len(ans))
@ -109,6 +109,7 @@ type tcpStream struct {
ruleset ruleset.Ruleset
activeEntries []*tcpStreamEntry
doneEntries []*tcpStreamEntry
finalVerdict tcpVerdict
}
type tcpStreamEntry struct {
@ -119,8 +120,13 @@ type tcpStreamEntry struct {
}
func (s *tcpStream) Accept(tcp *layers.TCP, ci gopacket.CaptureInfo, dir reassembly.TCPFlowDirection, nextSeq reassembly.Sequence, start *bool, ac reassembly.AssemblerContext) bool {
// Only accept packets if we still have active entries
return len(s.activeEntries) > 0
if len(s.activeEntries) > 0 {
return true
} else {
ctx := ac.(*tcpContext)
ctx.Verdict = s.finalVerdict
return false
}
}
func (s *tcpStream) ReassembledSG(sg reassembly.ScatterGather, ac reassembly.AssemblerContext) {
@ -152,7 +158,9 @@ func (s *tcpStream) ReassembledSG(sg reassembly.ScatterGather, ac reassembly.Ass
}
action := result.Action
if action != ruleset.ActionMaybe && action != ruleset.ActionModify {
ctx.Verdict = actionToTCPVerdict(action)
verdict := actionToTCPVerdict(action)
s.finalVerdict = verdict
ctx.Verdict = verdict
s.logger.TCPStreamAction(s.info, action, false)
// Verdict issued, no need to process any more packets
s.closeActiveEntries()
@ -160,6 +168,7 @@ func (s *tcpStream) ReassembledSG(sg reassembly.ScatterGather, ac reassembly.Ass
}
if len(s.activeEntries) == 0 && ctx.Verdict == tcpVerdictAccept {
// All entries are done but no verdict issued, accept stream
s.finalVerdict = tcpVerdictAcceptStream
ctx.Verdict = tcpVerdictAcceptStream
s.logger.TCPStreamAction(s.info, ruleset.ActionAllow, true)
}

17
engine/udp.go
View File

@ -65,7 +65,7 @@ func (f *udpStreamFactory) New(ipFlow, udpFlow gopacket.Flow, udp *layers.UDP, u
uc.Verdict = udpVerdictAcceptStream
f.Logger.UDPStreamAction(info, ruleset.ActionAllow, true)
// a udpStream with no activeEntries is a no-op
return &udpStream{}
return &udpStream{finalVerdict: udpVerdictAcceptStream}
}
// Create entries for each analyzer
entries := make([]*udpStreamEntry, 0, len(ans))
@ -167,6 +167,7 @@ type udpStream struct {
ruleset ruleset.Ruleset
activeEntries []*udpStreamEntry
doneEntries []*udpStreamEntry
finalVerdict udpVerdict
}
type udpStreamEntry struct {
@ -177,8 +178,12 @@ type udpStreamEntry struct {
}
func (s *udpStream) Accept(udp *layers.UDP, rev bool, uc *udpContext) bool {
// Only accept packets if we still have active entries
return len(s.activeEntries) > 0
if len(s.activeEntries) > 0 {
return true
} else {
uc.Verdict = s.finalVerdict
return false
}
}
func (s *udpStream) Feed(udp *layers.UDP, rev bool, uc *udpContext) {
@ -221,16 +226,18 @@ func (s *udpStream) Feed(udp *layers.UDP, rev bool, uc *udpContext) {
}
}
if action != ruleset.ActionMaybe {
var final bool
uc.Verdict, final = actionToUDPVerdict(action)
verdict, final := actionToUDPVerdict(action)
uc.Verdict = verdict
s.logger.UDPStreamAction(s.info, action, false)
if final {
s.finalVerdict = verdict
s.closeActiveEntries()
}
}
}
if len(s.activeEntries) == 0 && uc.Verdict == udpVerdictAccept {
// All entries are done but no verdict issued, accept stream
s.finalVerdict = udpVerdictAcceptStream
uc.Verdict = udpVerdictAcceptStream
s.logger.UDPStreamAction(s.info, ruleset.ActionAllow, true)
}