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Message-Id: <9330381537132576@sas1-d627dcb07a0e.qloud-c.yandex.net>
Date: Mon, 17 Sep 2018 00:16:16 +0300
From: Алексей Болдырев
<devel-net-ne-vlezay80@...dex.ru>
To: netdev <netdev@...r.kernel.org>
Subject: Oddities with connmark
Actually, there is a suricata with the following rules:
#pass tls any any -> any any (pcre: "/play.google.com/i"; tls_sni;nfq_set_mark:0x8/0xffffffff; sid:2466;)
#pass tls any any -> any any (pcre: "/google.com/i"; tls_sni;nfq_set_mark:0x8/0xffffffff; sid:2465;)
#pass tls any any -> any any (pcre: "/gstatic.com/i"; tls_sni;nfq_set_mark:0x8/0xffffffff; sid:2467;)
#pass tls any any -> any any (pcre: "/googleservice.com/i"; tls_sni;nfq_set_mark:0x8/0xffffffff; sid:2467;)
pass tls any any -> any any (pcre: "/youtube.com/s"; tls_sni;nfq_set_mark:0x2/0xffffffff; sid:2455;)
pass tls any any -> any any (pcre: "/googlevideo.com/s"; tls_sni;nfq_set_mark:0x2/0xffffffff; sid:2456;)
pass http any any <> any any (content: "tactical-market.ru"; http_header;nfq_set_mark:0x4/0xffffffff; sid:2457;)
pass http any any <> any any (content: "voent.org"; http_header;nfq_set_mark:0x4/0xffffffff; sid:2458;)
pass http any any <> any any (content: "h-mag.ru"; http_header;nfq_set_mark:0x4/0xffffffff; sid:2459;)
pass tls any any <> any any (content: "voent.org";tls_sni;nfq_set_mark:0x4/0xffffffff; sid:2460;)
pass tls any any <> any any (content: "h-mag.ru";tls_sni;nfq_set_mark:0x4/0xffffffff; sid:2461;)
rejectboth tcp any any <> any any (content: "GET http://";content: "Host: "; sid:2462;)
pass http any any <> any any (content: "302";http_stat_code;content: "ivrn.net";http_header;nfq_set_mark:0x64/0xffffffff; sid:2463;)
pass ssh any any <> any any (nfq_set_mark:0x6/0xffffffff; sid:2464;)
#reject tls any any <> any any (content:"www.youtube.com"; tls_sni;nfq_set_mark:0x2/0xffffffff; sid:2456;)
#ytimg.com
iptables:
Chain PREROUTING (policy ACCEPT 228K packets, 138M bytes)
pkts bytes target prot opt in out source destination
11 3630 RETURN all -- * * 0.0.0.0 255.255.255.255
127K 121M RETURN all -- eth1 * 0.0.0.0/0 0.0.0.0/0
187 11489 RETURN all -- ppp0 * 0.0.0.0/0 0.0.0.0/0
10365 2323K RETURN all -- vpns0.10 * 0.0.0.0/0 0.0.0.0/0
0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 rpfilter invert LOG flags 0 level 4 prefix "IP SPOOFING: "
0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0 rpfilter invert
0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0 -m ipv4options --flags 7
0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0 -m ipv4options --flags 3
0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0 -m ipv4options --flags 9
0 0 MARK all -- * * 0.0.0.0/0 0.0.0.0/0 match-set dpi_detect dst MARK xset 0x40/0xfe
0 0 MARK all -- * * 0.0.0.0/0 0.0.0.0/0 match-set dpi_detect src MARK xset 0x40/0xfe
Chain INPUT (policy ACCEPT 107K packets, 45M bytes)
pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 120K packets, 93M bytes)
pkts bytes target prot opt in out source destination
241K 185M DPI all -- * * 0.0.0.0/0 0.0.0.0/0
120K 93M DPI_SH all -- * * 0.0.0.0/0 0.0.0.0/0
2063 123K TCPMSS tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp flags:0x06/0x02 TCPMSS clamp to PMTU
Chain OUTPUT (policy ACCEPT 109K packets, 24M bytes)
pkts bytes target prot opt in out source destination
Chain POSTROUTING (policy ACCEPT 229K packets, 116M bytes)
pkts bytes target prot opt in out source destination
Chain DPI (1 references)
pkts bytes target prot opt in out source destination
0 0 RETURN all -- * * 198.18.0.0/15 192.168.0.0/15
0 0 RETURN all -- * * 192.168.0.0/16 198.18.0.0/15
0 0 RETURN all -- * * 192.168.0.0/16 192.168.0.0/16
121K 93M NFQUEUE all -- * * 0.0.0.0/0 0.0.0.0/0 mark match ! 0x1/0x1 NFQUEUE num 0
Chain DPI_SH (1 references)
pkts bytes target prot opt in out source destination
3542 2688K RETURN all -- * * 0.0.0.0/0 0.0.0.0/0 connmark match 0x8/0xfe
53 45450 CONNMARK all -- * * 0.0.0.0/0 0.0.0.0/0 mark match 0x8/0xfe CONNMARK xset 0x8/0xfe
0 0 CONNMARK all -- * * 0.0.0.0/0 0.0.0.0/0 mark match 0x4/0xfe CONNMARK xset 0x4/0xfe
8 9366 CONNMARK all -- * * 0.0.0.0/0 0.0.0.0/0 mark match 0x2/0xfe CONNMARK xset 0x2/0xfe
24094 27M CLASSIFY all -- * * 0.0.0.0/0 0.0.0.0/0 connmark match 0x2/0xfe CLASSIFY set 1:11
0 0 CLASSIFY all -- * * 0.0.0.0/0 0.0.0.0/0 connmark match 0x4/0xfe CLASSIFY set 1:12
0 0 SET all -- * * 0.0.0.0/0 0.0.0.0/0 mark match 0x64/0xfe add-set dpi_detect src
0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 mark match 0x64/0xfe LOG flags 0 level 4 prefix "INFOROOM DPI: "
ip6tables:
Chain PREROUTING (policy ACCEPT 314 packets, 60079 bytes)
pkts bytes target prot opt in out source destination
0 0 RETURN all eth1 * ::/0 ::/0
6722 5704K RETURN all ppp0 * ::/0 ::/0
2 112 RETURN all vpns0.10 * ::/0 ::/0
0 0 LOG all * * ::/0 ::/0 rpfilter invert LOG flags 0 level 4 prefix "IP6 SPOOFING: "
0 0 DROP all * * ::/0 ::/0 rpfilter invert
Chain INPUT (policy ACCEPT 15 packets, 984 bytes)
pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 299 packets, 59095 bytes)
pkts bytes target prot opt in out source destination
23065 13M DPI all * * ::/0 ::/0
11539 6450K DPI_SH all * * ::/0 ::/0
172 13760 TCPMSS tcp * * ::/0 ::/0 tcp flags:0x06/0x02 TCPMSS clamp to PMTU
Chain OUTPUT (policy ACCEPT 13 packets, 896 bytes)
pkts bytes target prot opt in out source destination
Chain POSTROUTING (policy ACCEPT 312 packets, 59991 bytes)
pkts bytes target prot opt in out source destination
Chain DPI (1 references)
pkts bytes target prot opt in out source destination
1 1280 RETURN all * * 2a01:d0:c353::/48 2a01:d0:c353::/48
0 0 RETURN all * * 2a01:d0:c353::/48 2a01:d0:c353::/48
11526 6448K NFQUEUE all * * ::/0 ::/0 mark match ! 0x1/0x1 NFQUEUE num 0
Chain DPI_SH (1 references)
pkts bytes target prot opt in out source destination
0 0 RETURN all * * ::/0 ::/0 connmark match 0x8/0xfe
0 0 CONNMARK all * * ::/0 ::/0 mark match 0x8/0xfe CONNMARK xset 0x8/0xfe
0 0 CONNMARK all * * ::/0 ::/0 mark match 0x4/0xfe CONNMARK xset 0x4/0xfe
31 36225 CONNMARK all * * ::/0 ::/0 mark match 0x2/0xfe CONNMARK xset 0x2/0xfe
215 86776 CLASSIFY all * * ::/0 ::/0 connmark match 0x2/0xfe CLASSIFY set 1:11
0 0 CLASSIFY all * * ::/0 ::/0 connmark match 0x4/0xfe CLASSIFY set 1:12
0 0 LOG all * * ::/0 ::/0 mark match 0x64/0xfe LOG flags 0 level 4 prefix "INFOROOM DPI: "
Now the question: why when going on google.com, the rule
314 115K CLASSIFY all * * ::/0 ::/0 connmark match 0x2/0xfe CLASSIFY set 1:11
starts to work? In theory, it should work if you go to youtube.com.
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