From 35fdbc81480cdeaafc593fe952b2b28ebccbb0c2 Mon Sep 17 00:00:00 2001 From: Ivan Nardi <12729895+IvanNardi@users.noreply.github.com> Date: Tue, 18 Oct 2022 16:40:15 +0200 Subject: TLS: explicit ignore client certificate (#1776) TLS classification usually stops after processing *server* certificates (if any). That means, that *client* certificate, if present, is usually ignored. However in some corner cases (i.e. unidirectional traffic) we might end up processing client certificate and exposing its metadata: the issue is that the application will think that this metadata are about the server and not about the client. So, for the time being, always ignore client certificate processing. As a future work, we might find an efficient way to process and export both certificates. --- ...ient_certificate_with_missing_server_one.pcapng | Bin 0 -> 6328 bytes tests/pcap/tls_unidirectional.pcap | Bin 0 -> 15217 bytes ..._certificate_with_missing_server_one.pcapng.out | 31 +++++++++++++++++++++ tests/result/tls_unidirectional.pcap.out | 31 +++++++++++++++++++++ 4 files changed, 62 insertions(+) create mode 100644 tests/pcap/tls_client_certificate_with_missing_server_one.pcapng create mode 100644 tests/pcap/tls_unidirectional.pcap create mode 100644 tests/result/tls_client_certificate_with_missing_server_one.pcapng.out create mode 100644 tests/result/tls_unidirectional.pcap.out (limited to 'tests') diff --git a/tests/pcap/tls_client_certificate_with_missing_server_one.pcapng b/tests/pcap/tls_client_certificate_with_missing_server_one.pcapng new file mode 100644 index 000000000..40cb1eb30 Binary files /dev/null and b/tests/pcap/tls_client_certificate_with_missing_server_one.pcapng differ diff --git a/tests/pcap/tls_unidirectional.pcap b/tests/pcap/tls_unidirectional.pcap new file mode 100644 index 000000000..c46674086 Binary files /dev/null and b/tests/pcap/tls_unidirectional.pcap differ diff --git a/tests/result/tls_client_certificate_with_missing_server_one.pcapng.out b/tests/result/tls_client_certificate_with_missing_server_one.pcapng.out new file mode 100644 index 000000000..65d569510 --- /dev/null +++ b/tests/result/tls_client_certificate_with_missing_server_one.pcapng.out @@ -0,0 +1,31 @@ +Guessed flow protos: 0 + +DPI Packets (TCP): 16 (8.00 pkts/flow) +Confidence DPI : 2 (flows) +Num dissector calls: 4 (2.00 diss/flow) +LRU cache ookla: 0/0/0 (insert/search/found) +LRU cache bittorrent: 0/0/0 (insert/search/found) +LRU cache zoom: 0/0/0 (insert/search/found) +LRU cache stun: 0/0/0 (insert/search/found) +LRU cache tls_cert: 0/3/0 (insert/search/found) +LRU cache mining: 0/0/0 (insert/search/found) +LRU cache msteams: 0/0/0 (insert/search/found) +Automa host: 0/0 (search/found) +Automa domain: 0/0 (search/found) +Automa tls cert: 0/0 (search/found) +Automa risk mask: 0/0 (search/found) +Automa common alpns: 0/0 (search/found) +Patricia risk mask: 4/0 (search/found) +Patricia risk: 0/0 (search/found) +Patricia protocols: 4/0 (search/found) + +TLS 17 5526 2 + +JA3 Host Stats: + IP Address # JA3C + 1 192.168.1.128 1 + 2 195.181.174.176 1 + + + 1 TCP 195.181.174.176:443 <-> 192.168.1.128:48260 [proto: 91/TLS][IP: 0/Unknown][Encrypted][Confidence: DPI][cat: Web/5][3 pkts/1654 bytes <-> 6 pkts/1779 bytes][Goodput ratio: 87/78][0.04 sec][ALPN: anydesk/6.2.0/linux][bytes ratio: -0.036 (Mixed)][IAT c2s/s2c min/avg/max/stddev: 3/0 10/8 17/20 7/9][Pkt Len c2s/s2c min/avg/max/stddev: 66/66 551/296 1514/1160 681/400][Risk: ** Missing SNI TLS Extn **][Risk Score: 50][TLSv1.2][JA3C: 29b5a018fa5992fe23560c16af0dc9fc][JA3S: e58f0b3c1e9eefb8ee4f92aeceee5858][Firefox][Cipher: TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384][Plen Bins: 0,0,0,0,0,0,0,0,0,33,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,33,0,0,0,0,0,0,0,0,0,0,33,0,0] + 2 TCP 192.168.1.128:59754 <-> 192.168.1.181:7070 [proto: 91/TLS][IP: 0/Unknown][Encrypted][Confidence: DPI][cat: Web/5][6 pkts/1953 bytes <-> 2 pkts/140 bytes][Goodput ratio: 79/0][0.08 sec][bytes ratio: 0.866 (Upload)][IAT c2s/s2c min/avg/max/stddev: 0/6 15/6 54/6 20/0][Pkt Len c2s/s2c min/avg/max/stddev: 66/66 326/70 1352/74 469/4][Risk: ** Known Proto on Non Std Port **** TLS (probably) Not Carrying HTTPS **** Missing SNI TLS Extn **][Risk Score: 110][Risk Info: No ALPN][TLSv1.2][JA3C: 201999283915cc31cee6b15472ef3332][Firefox][Plen Bins: 0,0,0,0,0,0,0,0,50,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,50,0,0,0,0,0,0,0] diff --git a/tests/result/tls_unidirectional.pcap.out b/tests/result/tls_unidirectional.pcap.out new file mode 100644 index 000000000..4f8fa35e7 --- /dev/null +++ b/tests/result/tls_unidirectional.pcap.out @@ -0,0 +1,31 @@ +Guessed flow protos: 0 + +DPI Packets (TCP): 12 (6.00 pkts/flow) +Confidence DPI : 2 (flows) +Num dissector calls: 4 (2.00 diss/flow) +LRU cache ookla: 0/0/0 (insert/search/found) +LRU cache bittorrent: 0/0/0 (insert/search/found) +LRU cache zoom: 0/0/0 (insert/search/found) +LRU cache stun: 0/0/0 (insert/search/found) +LRU cache tls_cert: 0/2/0 (insert/search/found) +LRU cache mining: 0/0/0 (insert/search/found) +LRU cache msteams: 0/0/0 (insert/search/found) +Automa host: 1/1 (search/found) +Automa domain: 1/0 (search/found) +Automa tls cert: 0/0 (search/found) +Automa risk mask: 0/0 (search/found) +Automa common alpns: 0/0 (search/found) +Patricia risk mask: 4/0 (search/found) +Patricia risk: 0/0 (search/found) +Patricia protocols: 3/1 (search/found) + +TLS 27 7693 1 +Google 6 6972 1 + +JA3 Host Stats: + IP Address # JA3C + 1 192.168.1.128 1 + + + 1 TCP 192.168.1.128:48260 -> 195.181.174.176:443 [proto: 91/TLS][IP: 0/Unknown][Encrypted][Confidence: DPI][cat: Web/5][27 pkts/7693 bytes -> 0 pkts/0 bytes][Goodput ratio: 77/0][58.79 sec][ALPN: anydesk/6.2.0/linux][bytes ratio: 1.000 (Upload)][IAT c2s/s2c min/avg/max/stddev: 0/0 2023/0 10210/0 3873/0][Pkt Len c2s/s2c min/avg/max/stddev: 66/0 285/0 1514/0 460/0][Risk: ** Missing SNI TLS Extn **** Unidirectional Traffic **][Risk Score: 60][Risk Info: No server to client traffic][TLSv1.2][JA3C: 29b5a018fa5992fe23560c16af0dc9fc][Firefox][Plen Bins: 0,20,20,0,10,0,0,0,0,10,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10,0,0,0,10,0,0,0,0,0,0,20,0,0] + 2 TCP 142.250.27.188:5228 -> 10.140.72.24:12654 [VLAN: 308][proto: 91.126/TLS.Google][IP: 126/Google][Encrypted][Confidence: DPI][cat: Web/5][6 pkts/6972 bytes -> 0 pkts/0 bytes][Goodput ratio: 94/0][0.16 sec][bytes ratio: 1.000 (Upload)][IAT c2s/s2c min/avg/max/stddev: 0/0 32/0 160/0 64/0][Pkt Len c2s/s2c min/avg/max/stddev: 78/0 1162/0 1418/0 490/0][Risk: ** Known Proto on Non Std Port **** Unidirectional Traffic **][Risk Score: 60][Risk Info: No client to server traffic][ServerNames: *.google.com,*.appengine.google.com,*.bdn.dev,*.cloud.google.com,*.crowdsource.google.com,*.datacompute.google.com,*.google.ca,*.google.cl,*.google.co.in,*.google.co.jp,*.google.co.uk,*.google.com.ar,*.google.com.au,*.google.com.br,*.google.com.co,*.google.com.mx,*.google.com.tr,*.google.com.vn,*.google.de,*.google.es,*.google.fr,*.google.hu,*.google.it,*.google.nl,*.google.pl,*.google.pt,*.googleadapis.com,*.googleapis.cn,*.googlevideo.com,*.gstatic.cn,*.gstatic-cn.com,googlecnapps.cn,*.googlecnapps.cn,googleapps-cn.com,*.googleapps-cn.com,gkecnapps.cn,*.gkecnapps.cn,googledownloads.cn,*.googledownloads.cn,recaptcha.net.cn,*.recaptcha.net.cn,widevine.cn,*.widevine.cn,ampproject.org.cn,*.ampproject.org.cn,ampproject.net.cn,*.ampproject.net.cn,google-analytics-cn.com,*.google-analytics-cn.com,googleadservices-cn.com,*.googleadservices-cn.com,googlevads-cn.com,*.googlevads-cn.com,googleapis-cn.com,*.googleapis-cn.com,googleoptimize-cn.com,*.googleoptimize-cn.com,doubleclick-cn.net,*.doubleclick-cn.net,*.fls.doubleclick-cn.net,*.g.doubleclick-cn.net,doubleclick.cn,*.doubleclick.cn,*.fls.doubleclick.cn,*.g.doubleclick.cn,dartsearch-cn.net,*.dartsearch-cn.net,googletraveladservices-cn.com,*.googletraveladservices-cn.com,googletagservices-cn.com,*.googletagservices-cn.com,googletagmanager-cn.com,*.googletagmanager-cn.com,googlesyndication-cn.com,*.googlesyndication-cn.com,*.safeframe.googlesyndication-cn.com,app-measurement-cn.com,*.app-measurement-cn.com,gvt1-cn.com,*.gvt1-cn.com,gvt2-cn.com,*.gvt2-cn.com,2mdn-cn.net,*.2mdn-cn.net,googleflights-cn.net,*.googleflights-cn.net,admob-cn.com,*.admob-cn.com,*.gstatic.com,*.metric.gstatic.com,*.gvt1.com,*.gcpcdn.gvt1.com,*.gvt2.com,*.gcp.gvt2.com,*.url.google.com,*.youtube-nocookie.com,*.ytimg.com,android.com,*.android.com,*.flash.android.com,g.cn,*.g.cn,g.co,*.g.co,goo.gl,www.goo.gl,google-analytics.com,*.google-analytics.com,google.com,googlecommerce.com,*.googlecommerce.com,ggpht.cn,*.ggpht.cn,urchin.com,*.urchin.com,youtu.be,youtube.com,*.youtube.com,youtubeeducation.com,*.youtubeeducation.com,youtubekids.com,*.youtubekids.com,yt.be,*.yt.be,android.clients.google.com,developer.android.google.cn,developers.android.google.cn,source.android.google.cn][JA3S: 84aaf6d03fc8c5bfb56d1d188735b268][Issuer: C=US, O=Google Trust Services LLC, CN=GTS CA 1C3][Subject: CN=*.google.com][Certificate SHA-1: 02:64:CA:2E:8A:2F:BB:C4:97:9D:A7:AC:2B:47:FF:DE:28:0E:71:B1][Validity: 2021-11-01 02:19:52 - 2022-01-24 02:19:51][Cipher: TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256][Plen Bins: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,20,0,0,0,0,0,80,0,0,0,0,0] -- cgit v1.2.3