Date: Sat, 30 Jan 2021 15:27:08 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 253096] TCP MD5 regression on STABLE/13 Message-ID: <bug-253096-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253096 Bug ID: 253096 Summary: TCP MD5 regression on STABLE/13 Product: Base System Version: 13.0-STABLE Hardware: amd64 OS: Any Status: New Keywords: regression Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: zarychtam@plan-b.pwste.edu.pl Created attachment 222023 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=222023&action=edit A sample of MD5 signed traffic I was testing net/bird on 13.0-ALPHA3 and found that BGP MD5 signed IPv4 session with another instance of Bird running on stable/11 cannot be established. Please let me describe the scenario. On affected machine running 13.0-ALPHA I have: # cat /etc/ipsec.conf flush ; add 172.31.1.2 172.31.1.6 tcp 0x1000 -A tcp-md5 "abigpassword" ; add 172.31.1.6 172.31.1.2 tcp 0x1001 -A tcp-md5 "abigpassword" ; # setkey -D 172.31.1.6 172.31.1.2 tcp mode=any spi=4097(0x00001001) reqid=0(0x00000000) A: tcp-md5 61626967 70617373 776f7264 seq=0x00000000 replay=0 flags=0x00000040 state=mature created: Jan 30 15:32:23 2021 current: Jan 30 15:54:43 2021 diff: 1340(s) hard: 0(s) soft: 0(s) last: Jan 30 15:33:05 2021 hard: 0(s) soft: 0(s) current: 440(bytes) hard: 0(bytes) soft: 0(bytes) allocated: 131 hard: 0 soft: 0 sadb_seq=1 pid=7647 refcnt=1 172.31.1.2 172.31.1.6 tcp mode=any spi=4096(0x00001000) reqid=0(0x00000000) A: tcp-md5 61626967 70617373 776f7264 seq=0x00000000 replay=0 flags=0x00000040 state=mature created: Jan 30 15:32:23 2021 current: Jan 30 15:54:43 2021 diff: 1340(s) hard: 0(s) soft: 0(s) last: Jan 30 15:33:05 2021 hard: 0(s) soft: 0(s) current: 4111(bytes) hard: 0(bytes) soft: 0(bytes) allocated: 52 hard: 0 soft: 0 sadb_seq=0 pid=7647 refcnt=1 On machine running stable/11 I have: # cat /etc/ipsec.conf flush ; add 172.31.1.6 172.31.1.2 tcp 0x1000 -A tcp-md5 "abigpassword" ; add 172.31.1.2 172.31.1.6 tcp 0x1001 -A tcp-md5 "abigpassword" ; # setkey -D 172.31.1.2 172.31.1.6 tcp mode=any spi=4097(0x00001001) reqid=0(0x00000000) A: tcp-md5 61626967 70617373 776f7264 seq=0x00000000 replay=0 flags=0x00000040 state=mature created: Jan 30 15:18:20 2021 current: Jan 30 15:55:13 2021 diff: 2213(s) hard: 0(s) soft: 0(s) last: Jan 30 15:26:32 2021 hard: 0(s) soft: 0(s) current: 8031(bytes) hard: 0(bytes) soft: 0(bytes) allocated: 101 hard: 0 soft: 0 sadb_seq=1 pid=85243 refcnt=1 172.31.1.6 172.31.1.2 tcp mode=any spi=4096(0x00001000) reqid=0(0x00000000) A: tcp-md5 61626967 70617373 776f7264 seq=0x00000000 replay=0 flags=0x00000040 state=mature created: Jan 30 15:18:20 2021 current: Jan 30 15:55:13 2021 diff: 2213(s) hard: 0(s) soft: 0(s) last: Jan 30 15:33:05 2021 hard: 0(s) soft: 0(s) current: 10226(bytes) hard: 0(bytes) soft: 0(bytes) allocated: 131 hard: 0 soft: 0 sadb_seq=0 pid=85243 refcnt=1 So far, everything looks fine, now for easier debugging I take nc(1) and try to transmit some signed TCP segments. They arrive from stable/11 to stable/13 as signed correctly, but the responding traffic is reported to be signed incorrectly (please see attached dumps). The handshake looks fine, but the segments send later from the affected stable/13 have invalid signatures what is reported accordingly on both sides. -- You are receiving this mail because: You are the assignee for the bug.home | help
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