Network Events
Tracee offers a set of network events that makes it easy to trace network activity in common protocols.
Available network events¶
- net_packet_ipv4
- net_packet_ipv6
- net_packet_tcp
- net_packet_udp
- net_packet_icmp
- net_packet_icmpv6
- net_packet_dns
- net_packet_dns_request
- net_packet_dns_response
Examples¶
net_packet_ipv4¶
# three way handshake for a TCP connection.
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{"timestamp":1671040290193572748,"threadStartTime":341237880436231,"processorId":13,"processId":3120261,"cgroupId":20552,"threadId":3120261,"parentProcessId":3101489,"hostProcessId":3120261,"hostThreadId":3120261,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"nc","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2007","eventName":"net_packet_ipv4","argsNum":3,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"10.157.254.193"},{"name":"dst","type":"const char*","value":"10.157.254.1"},{"name":"proto_ipv4","type":"trace.ProtoIPv4","value":{"version":4,"IHL":5,"TOS":0,"length":60,"id":0,"flags":2,"fragOffset":0,"TTL":64,"protocol":"TCP","checksum":10431,"srcIP":"10.157.254.193","dstIP":"10.157.254.1"}}]}
{"timestamp":1671040290193642873,"threadStartTime":341237880436231,"processorId":13,"processId":3120261,"cgroupId":20552,"threadId":3120261,"parentProcessId":3101489,"hostProcessId":3120261,"hostThreadId":3120261,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"nc","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2007","eventName":"net_packet_ipv4","argsNum":3,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"10.157.254.1"},{"name":"dst","type":"const char*","value":"10.157.254.193"},{"name":"proto_ipv4","type":"trace.ProtoIPv4","value":{"version":4,"IHL":5,"TOS":0,"length":52,"id":42858,"flags":2,"fragOffset":0,"TTL":64,"protocol":"TCP","checksum":33116,"srcIP":"10.157.254.1","dstIP":"10.157.254.193"}}]}
# send a single packet and receive an ack.
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{"timestamp":1671040295320501275,"threadStartTime":341237880436231,"processorId":15,"processId":3120261,"cgroupId":20552,"threadId":3120261,"parentProcessId":3101489,"hostProcessId":3120261,"hostThreadId":3120261,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"nc","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2007","eventName":"net_packet_ipv4","argsNum":3,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"10.157.254.193"},{"name":"dst","type":"const char*","value":"10.157.254.1"},{"name":"proto_ipv4","type":"trace.ProtoIPv4","value":{"version":4,"IHL":5,"TOS":0,"length":52,"id":56842,"flags":2,"fragOffset":0,"TTL":64,"protocol":"TCP","checksum":19132,"srcIP":"10.157.254.193","dstIP":"10.157.254.1"}}]}
# receive a single packet and send an ack.
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{"timestamp":1671040299925385970,"threadStartTime":341237880436231,"processorId":5,"processId":3120261,"cgroupId":20552,"threadId":3120261,"parentProcessId":3101489,"hostProcessId":3120261,"hostThreadId":3120261,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"nc","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2007","eventName":"net_packet_ipv4","argsNum":3,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"10.157.254.1"},{"name":"dst","type":"const char*","value":"10.157.254.193"},{"name":"proto_ipv4","type":"trace.ProtoIPv4","value":{"version":4,"IHL":5,"TOS":0,"length":52,"id":42860,"flags":2,"fragOffset":0,"TTL":64,"protocol":"TCP","checksum":33114,"srcIP":"10.157.254.1","dstIP":"10.157.254.193"}}]}
net_packet_ipv6¶
# three way handshake for a TCP under IPv6 connection.
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{"timestamp":1671041051950428522,"threadStartTime":341999636945074,"processorId":3,"processId":3141206,"cgroupId":20552,"threadId":3141206,"parentProcessId":3101489,"hostProcessId":3141206,"hostThreadId":3141206,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"nc","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2008","eventName":"net_packet_ipv6","argsNum":3,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"fd6e:a63d:71f:2000::2"},{"name":"dst","type":"const char*","value":"fd6e:a63d:71f:2000::1"},{"name":"proto_ipv6","type":"trace.ProtoIPv6","value":{"version":6,"trafficClass":0,"flowLabel":917337,"length":40,"nextHeader":"TCP","hopLimit":64,"srcIP":"fd6e:a63d:71f:2000::2","dstIP":"fd6e:a63d:71f:2000::1"}}]}
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# send a single packet and receive an ack.
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{"timestamp":1671041054444933243,"threadStartTime":341999636945074,"processorId":19,"processId":3141206,"cgroupId":20552,"threadId":3141206,"parentProcessId":3101489,"hostProcessId":3141206,"hostThreadId":3141206,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"nc","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2008","eventName":"net_packet_ipv6","argsNum":3,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"fd6e:a63d:71f:2000::2"},{"name":"dst","type":"const char*","value":"fd6e:a63d:71f:2000::1"},{"name":"proto_ipv6","type":"trace.ProtoIPv6","value":{"version":6,"trafficClass":0,"flowLabel":917337,"length":32,"nextHeader":"TCP","hopLimit":64,"srcIP":"fd6e:a63d:71f:2000::2","dstIP":"fd6e:a63d:71f:2000::1"}}]}
# receive a single packet and send an ack.
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net_packet_tcp¶
# three way handshake for the tcp connection (note SYN and ACK flags).
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# send a single packet and receive an ack for the sequence.
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# receive a single packet and send an ack for the sequence.
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net_packet_udp¶
# send a single packet.
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# receive a single packet.
{"timestamp":1671041746569025030,"threadStartTime":342691388187456,"processorId":5,"processId":3160590,"cgroupId":20552,"threadId":3160590,"parentProcessId":3101489,"hostProcessId":3160590,"hostThreadId":3160590,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"nc","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2010","eventName":"net_packet_udp","argsNum":3,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"10.157.254.193"},{"name":"dst","type":"const char*","value":"10.157.254.1"},{"name":"proto_udp","type":"trace.ProtoUDP","value":{"srcPort":8090,"dstPort":54370,"length":10,"checksum":4633}}]}
net_packet_icmp¶
# send an ICMP echo request.
{"timestamp":1671041834556860509,"threadStartTime":342782244688605,"processorId":0,"processId":3162824,"cgroupId":20552,"threadId":3162824,"parentProcessId":3101489,"hostProcessId":3162824,"hostThreadId":3162824,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"ping","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2011","eventName":"net_packet_icmp","argsNum":3,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"10.157.254.1"},{"name":"dst","type":"const char*","value":"10.157.254.193"},{"name":"proto_icmp","type":"trace.ProtoICMP","value":{"typeCode":"EchoRequest","checksum":1592,"id":27646,"seq":1}}]}
# receive an ICMP echo reply.
{"timestamp":1671041834557721951,"threadStartTime":342782244688605,"processorId":13,"processId":3162824,"cgroupId":20552,"threadId":3162824,"parentProcessId":3101489,"hostProcessId":3162824,"hostThreadId":3162824,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"ping","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2011","eventName":"net_packet_icmp","argsNum":3,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"10.157.254.193"},{"name":"dst","type":"const char*","value":"10.157.254.1"},{"name":"proto_icmp","type":"trace.ProtoICMP","value":{"typeCode":"EchoReply","checksum":3640,"id":27646,"seq":1}}]}
net_packet_icmpv6¶
# send an ICMPv6 echo request.
{"timestamp":1671041966651955456,"threadStartTime":342914339316549,"processorId":13,"processId":3166608,"cgroupId":20552,"threadId":3166608,"parentProcessId":3101489,"hostProcessId":3166608,"hostThreadId":3166608,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"ping","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2012","eventName":"net_packet_icmpv6","argsNum":3,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"fd6e:a63d:71f:2000::1"},{"name":"dst","type":"const char*","value":"fd6e:a63d:71f:2000::2"},{"name":"proto_icmpv6","type":"trace.ProtoICMPv6","value":{"typeCode":"EchoRequest","checksum":25099}}]}
# receive an ICMPv6 echo reply.
{"timestamp":1671041966653079084,"threadStartTime":342914339316549,"processorId":3,"processId":3166608,"cgroupId":20552,"threadId":3166608,"parentProcessId":3101489,"hostProcessId":3166608,"hostThreadId":3166608,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"ping","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2012","eventName":"net_packet_icmpv6","argsNum":3,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"fd6e:a63d:71f:2000::2"},{"name":"dst","type":"const char*","value":"fd6e:a63d:71f:2000::1"},{"name":"proto_icmpv6","type":"trace.ProtoICMPv6","value":{"typeCode":"EchoReply","checksum":24843}}]}
net_packet_dns¶
# query type=A from nslookup to local systemd-resolved.
{"timestamp":1671042316117498783,"threadStartTime":343263806334087,"processorId":7,"processId":3179904,"cgroupId":20552,"threadId":3179905,"parentProcessId":3101489,"hostProcessId":3179904,"hostThreadId":3179905,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"isc-net-0000","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2013","eventName":"net_packet_dns","argsNum":5,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"127.0.0.1"},{"name":"dst","type":"const char*","value":"127.0.0.53"},{"name":"src_port","type":"u16","value":42752},{"name":"dst_port","type":"u16","value":53},{"name":"proto_dns","type":"trace.ProtoDNS","value":{"ID":52902,"QR":0,"opCode":"query","AA":0,"TC":0,"RD":1,"RA":0,"Z":0,"responseCode":"no error","QDCount":1,"ANCount":0,"NSCount":0,"ARCount":0,"questions":[{"name":"www.uol.com.br","type":"A","class":"IN"}],"answers":[],"authorities":[],"additionals":[]}}]}
# response from systemd-resolved to nslookup (after querying default nameserver).
# response contains original query and multiple answers to the query.
{"timestamp":1671042316131226611,"threadStartTime":343263806334087,"processorId":10,"processId":3179904,"cgroupId":20552,"threadId":3179905,"parentProcessId":3101489,"hostProcessId":3179904,"hostThreadId":3179905,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"isc-net-0000","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2013","eventName":"net_packet_dns","argsNum":5,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"127.0.0.53"},{"name":"dst","type":"const char*","value":"127.0.0.1"},{"name":"src_port","type":"u16","value":53},{"name":"dst_port","type":"u16","value":42752},{"name":"proto_dns","type":"trace.ProtoDNS","value":{"ID":52902,"QR":1,"opCode":"query","AA":0,"TC":0,"RD":1,"RA":1,"Z":0,"responseCode":"no error","QDCount":1,"ANCount":5,"NSCount":0,"ARCount":0,"questions":[{"name":"www.uol.com.br","type":"A","class":"IN"}],"answers":[{"name":"www.uol.com.br","type":"CNAME","class":"IN","TTL":43,"IP":"","NS":"","CNAME":"dftex7xfha8fh.cloudfront.net","PTR":"","TXTs":null,"SOA":{"MName":"","RName":"","serial":0,"refresh":0,"retry":0,"expire":0,"minimum":0},"SRV":{"priority":0,"weight":0,"port":0,"name":""},"MX":{"preference":0,"name":""},"OPT":[],"URI":{"priority":0,"weight":0,"target":""},"TXT":""},{"name":"dftex7xfha8fh.cloudfront.net","type":"A","class":"IN","TTL":55,"IP":"65.8.214.126","NS":"","CNAME":"","PTR":"","TXTs":null,"SOA":{"MName":"","RName":"","serial":0,"refresh":0,"retry":0,"expire":0,"minimum":0},"SRV":{"priority":0,"weight":0,"port":0,"name":""},"MX":{"preference":0,"name":""},"OPT":[],"URI":{"priority":0,"weight":0,"target":""},"TXT":""},{"name":"dftex7xfha8fh.cloudfront.net","type":"A","class":"IN","TTL":55,"IP":"65.8.214.78","NS":"","CNAME":"","PTR":"","TXTs":null,"SOA":{"MName":"","RName":"","serial":0,"refresh":0,"retry":0,"expire":0,"minimum":0},"SRV":{"priority":0,"weight":0,"port":0,"name":""},"MX":{"preference":0,"name":""},"OPT":[],"URI":{"priority":0,"weight":0,"target":""},"TXT":""},{"name":"dftex7xfha8fh.cloudfront.net","type":"A","class":"IN","TTL":55,"IP":"65.8.214.70","NS":"","CNAME":"","PTR":"","TXTs":null,"SOA":{"MName":"","RName":"","serial":0,"refresh":0,"retry":0,"expire":0,"minimum":0},"SRV":{"priority":0,"weight":0,"port":0,"name":""},"MX":{"preference":0,"name":""},"OPT":[],"URI":{"priority":0,"weight":0,"target":""},"TXT":""},{"name":"dftex7xfha8fh.cloudfront.net","type":"A","class":"IN","TTL":55,"IP":"65.8.214.49","NS":"","CNAME":"","PTR":"","TXTs":null,"SOA":{"MName":"","RName":"","serial":0,"refresh":0,"retry":0,"expire":0,"minimum":0},"SRV":{"priority":0,"weight":0,"port":0,"name":""},"MX":{"preference":0,"name":""},"OPT":[],"URI":{"priority":0,"weight":0,"target":""},"TXT":""}],"authorities":[],"additionals":[]}}]}
# query type=MX from nslookup to local systemd-resolved.
{"timestamp":1671042491079309907,"threadStartTime":343438768169717,"processorId":1,"processId":3183907,"cgroupId":20552,"threadId":3183908,"parentProcessId":3101489,"hostProcessId":3183907,"hostThreadId":3183908,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"isc-net-0000","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2013","eventName":"net_packet_dns","argsNum":5,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"127.0.0.1"},{"name":"dst","type":"const char*","value":"127.0.0.53"},{"name":"src_port","type":"u16","value":34981},{"name":"dst_port","type":"u16","value":53},{"name":"proto_dns","type":"trace.ProtoDNS","value":{"ID":33920,"QR":0,"opCode":"query","AA":0,"TC":0,"RD":1,"RA":0,"Z":0,"responseCode":"no error","QDCount":1,"ANCount":0,"NSCount":0,"ARCount":0,"questions":[{"name":"uol.com.br","type":"MX","class":"IN"}],"answers":[],"authorities":[],"additionals":[]}}]}
# response from systemd-resolved to nslookup containing original MX query and the MX answer.
{"timestamp":1671042491090381166,"threadStartTime":343438768169717,"processorId":10,"processId":3183907,"cgroupId":20552,"threadId":3183908,"parentProcessId":3101489,"hostProcessId":3183907,"hostThreadId":3183908,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"isc-net-0000","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2013","eventName":"net_packet_dns","argsNum":5,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"127.0.0.53"},{"name":"dst","type":"const char*","value":"127.0.0.1"},{"name":"src_port","type":"u16","value":53},{"name":"dst_port","type":"u16","value":34981},{"name":"proto_dns","type":"trace.ProtoDNS","value":{"ID":33920,"QR":1,"opCode":"query","AA":0,"TC":0,"RD":1,"RA":1,"Z":0,"responseCode":"no error","QDCount":1,"ANCount":1,"NSCount":0,"ARCount":0,"questions":[{"name":"uol.com.br","type":"MX","class":"IN"}],"answers":[{"name":"uol.com.br","type":"MX","class":"IN","TTL":17618,"IP":"","NS":"","CNAME":"","PTR":"","TXTs":null,"SOA":{"MName":"","RName":"","serial":0,"refresh":0,"retry":0,"expire":0,"minimum":0},"SRV":{"priority":0,"weight":0,"port":0,"name":""},"MX":{"preference":10,"name":"mx.uol.com.br"},"OPT":[],"URI":{"priority":0,"weight":0,"target":""},"TXT":""}],"authorities":[],"additionals":[]}}]}
net_packet_dns_request¶
# query type=A from nslookup to local systemd-resolved.
# this event does not contain all DNS header fields as the net_packet_dns does.
{"timestamp":1671043215487322928,"threadStartTime":344163176158597,"processorId":5,"processId":3200575,"cgroupId":20552,"threadId":3200576,"parentProcessId":3101489,"hostProcessId":3200575,"hostThreadId":3200576,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"isc-net-0000","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2014","eventName":"net_packet_dns_request","argsNum":2,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"metadata","type":"trace.PktMeta","value":{"src_ip":"127.0.0.1","dst_ip":"127.0.0.53","src_port":46259,"dst_port":53,"protocol":17,"packet_len":60,"iface":"any"}},{"name":"dns_questions","type":"[]trace.DnsQueryData","value":[{"query":"www.uol.com.br","query_type":"A","query_class":"IN"}]}]}
{"timestamp":1671043215503932068,"threadStartTime":344163176158597,"processorId":10,"processId":3200575,"cgroupId":20552,"threadId":3200576,"parentProcessId":3101489,"hostProcessId":3200575,"hostThreadId":3200576,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"isc-net-0000","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2014","eventName":"net_packet_dns_request","argsNum":2,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"metadata","type":"trace.PktMeta","value":{"src_ip":"127.0.0.53","dst_ip":"127.0.0.1","src_port":53,"dst_port":46259,"protocol":17,"packet_len":166,"iface":"any"}},{"name":"dns_questions","type":"[]trace.DnsQueryData","value":[{"query":"www.uol.com.br","query_type":"A","query_class":"IN"}]}]}
Attention
The net_packet_dns_request event is an event that is backwards compatible with an existing event called dns_request. The intention to have such event is to allow existing signatures already relying in the dns_request event, to rely in the new net_packet_dns_request. The benefit for the new event is that, differently from the dns_request event, there is no need to set an interface to monitor events when monitoring net_packet_dns_request. It gets DNS events from all existing interfaces and filters applied.
Important
This event might be deprecated or have its argument types changed in future versions.
net_packet_response¶
# response from systemd-resolved to nslookup (after querying default nameserver).
# response contains original query and multiple answers to the query.
# this event does not contain all DNS header fields as the net_packet_dns does.
{"timestamp":1671043317719969041,"threadStartTime":344265391016498,"processorId":10,"processId":3203040,"cgroupId":20552,"threadId":3203041,"parentProcessId":3101489,"hostProcessId":3203040,"hostThreadId":3203041,"hostParentProcessId":3101489,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"isc-net-0000","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2015","eventName":"net_packet_dns_response","argsNum":2,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"metadata","type":"trace.PktMeta","value":{"src_ip":"127.0.0.53","dst_ip":"127.0.0.1","src_port":53,"dst_port":41373,"protocol":17,"packet_len":166,"iface":"any"}},{"name":"dns_response","type":"[]trace.DnsResponseData","value":[{"query_data":{"query":"www.uol.com.br","query_type":"A","query_class":"IN"},"dns_answer":[{"answer_type":"CNAME","ttl":22,"answer":"dftex7xfha8fh.cloudfront.net"},{"answer_type":"A","ttl":60,"answer":"65.8.214.126"},{"answer_type":"A","ttl":60,"answer":"65.8.214.70"},{"answer_type":"A","ttl":60,"answer":"65.8.214.49"},{"answer_type":"A","ttl":60,"answer":"65.8.214.78"}]}]}]}
Attention
The net_packet_dns_response event is an event that is backwards compatible with an existing event called dns_response. The intention to have such event is to allow existing signatures already relying in the dns_response event, to rely in the new net_packet_dns_response. The benefit for the new event is that, differently from the dns_response event, there is no need to set an interface to monitor events when monitoring net_packet_dns_response. It gets DNS events from all existing interfaces and filters applied.
Important
This event might be deprecated or have its argument types changed in future versions.
Network Event Filtering¶
Supported
For now it is NOT possible to filter the events through the
header fields, but it IS possible, and recommended, to filter
the events through src, dest fields. Not filtering
network events might be hard to consume because of the amount of
traced events.
Trace all TCP packets sent to port 80 anywhere, from any process:
tracee --output json --events net_packet_tcp.args.dst_port=80
{"timestamp":1671149983169847976,"threadStartTime":450930828307685,"processorId":22,"processId":1284215,"cgroupId":27149,"threadId":1284215,"parentProcessId":1268815,"hostProcessId":1284215,"hostThreadId":1284215,"hostParentProcessId":1268815,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"w3m","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2009","eventName":"net_packet_tcp","argsNum":5,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"192.168.100.2"},{"name":"dst","type":"const char*","value":"200.147.3.157"},{"name":"src_port","type":"u16","value":46594},{"name":"dst_port","type":"u16","value":80},{"name":"proto_tcp","type":"trace.ProtoTCP","value":{"srcPort":46594,"dstPort":80,"seq":3415564579,"ack":0,"dataOffset":10,"FIN":0,"SYN":1,"RST":0,"PSH":0,"ACK":0,"URG":0,"ECE":0,"CWR":0,"NS":0,"window":64240,"checksum":61705,"urgent":0}}]}
{"timestamp":1671149983178147951,"threadStartTime":450930828307685,"processorId":23,"processId":1284215,"cgroupId":27149,"threadId":1284215,"parentProcessId":1268815,"hostProcessId":1284215,"hostThreadId":1284215,"hostParentProcessId":1268815,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"w3m","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2009","eventName":"net_packet_tcp","argsNum":5,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"192.168.100.2"},{"name":"dst","type":"const char*","value":"200.147.3.157"},{"name":"src_port","type":"u16","value":46594},{"name":"dst_port","type":"u16","value":80},{"name":"proto_tcp","type":"trace.ProtoTCP","value":{"srcPort":46594,"dstPort":80,"seq":3415564580,"ack":1519583696,"dataOffset":8,"FIN":0,"SYN":0,"RST":0,"PSH":0,"ACK":1,"URG":0,"ECE":0,"CWR":0,"NS":0,"window":502,"checksum":61697,"urgent":0}}]}
{"timestamp":1671149983178263829,"threadStartTime":450930828307685,"processorId":22,"processId":1284215,"cgroupId":27149,"threadId":1284215,"parentProcessId":1268815,"hostProcessId":1284215,"hostThreadId":1284215,"hostParentProcessId":1268815,"userId":1000,"mountNamespace":4026531841,"pidNamespace":4026531836,"processName":"w3m","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2009","eventName":"net_packet_tcp","argsNum":5,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"192.168.100.2"},{"name":"dst","type":"const char*","value":"200.147.3.157"},{"name":"src_port","type":"u16","value":46594},{"name":"dst_port","type":"u16","value":80},{"name":"proto_tcp","type":"trace.ProtoTCP","value":{"srcPort":46594,"dstPort":80,"seq":3415564580,"ack":1519583696,"dataOffset":8,"FIN":0,"SYN":0,"RST":0,"PSH":1,"ACK":1,"URG":0,"ECE":0,"CWR":0,"NS":0,"window":502,"checksum":61907,"urgent":0}}]}
Trace all DNS packets received ONLY from Google DNS server '8.8.8.8':
tracee --output json --events net_packet_dns.args.src=8.8.8.8
(only systemd-resolved, since all the other processes are resolving using local systemd-resolved server 127.0.1.1:53):
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{"timestamp":1671044491458692167,"threadStartTime":17862285588,"processorId":5,"processId":1016,"cgroupId":2847,"threadId":1016,"parentProcessId":1,"hostProcessId":1016,"hostThreadId":1016,"hostParentProcessId":1,"userId":104,"mountNamespace":4026533212,"pidNamespace":4026531836,"processName":"systemd-resolve","hostName":"fujitsu","containerId":"","containerImage":"","containerName":"","podName":"","podNamespace":"","podUID":"","eventId":"2013","eventName":"net_packet_dns","argsNum":5,"returnValue":0,"stackAddresses":[0],"contextFlags":{"containerStarted":false,"isCompat":false},"args":[{"name":"src","type":"const char*","value":"8.8.8.8"},{"name":"dst","type":"const char*","value":"192.168.100.2"},{"name":"src_port","type":"u16","value":53},{"name":"dst_port","type":"u16","value":44834},{"name":"proto_dns","type":"trace.ProtoDNS","value":{"ID":60536,"QR":1,"opCode":"query","AA":0,"TC":0,"RD":1,"RA":1,"Z":0,"responseCode":"no error","QDCount":1,"ANCount":1,"NSCount":0,"ARCount":1,"questions":[{"name":"github.com","type":"A","class":"IN"}],"answers":[{"name":"github.com","type":"A","class":"IN","TTL":60,"IP":"20.201.28.151","NS":"","CNAME":"","PTR":"","TXTs":null,"SOA":{"MName":"","RName":"","serial":0,"refresh":0,"retry":0,"expire":0,"minimum":0},"SRV":{"priority":0,"weight":0,"port":0,"name":""},"MX":{"preference":0,"name":""},"OPT":[],"URI":{"priority":0,"weight":0,"target":""},"TXT":""}],"authorities":[],"additionals":[{"name":"","type":"OPT","class":"Unknown","TTL":0,"IP":"","NS":"","CNAME":"","PTR":"","TXTs":null,"SOA":{"MName":"","RName":"","serial":0,"refresh":0,"retry":0,"expire":0,"minimum":0},"SRV":{"priority":0,"weight":0,"port":0,"name":""},"MX":{"preference":0,"name":""},"OPT":[],"URI":{"priority":0,"weight":0,"target":""},"TXT":""}]}}]}
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Network Based Signatures¶
It is possible to create Golang (or Rego) signatures for the network events. If you haven't read about how to create signatures, do it HERE.
Examples
Below is an example of how to create a signature for the net_packet_dns event. This same example is used by Tracee CI/CD tests and can be found at the GitHub repository, together with some other signatures for the network events.
- net_packet_dns signature example
package main
import (
"fmt"
"strings"
"github.com/aquasecurity/tracee/signatures/helpers"
"github.com/aquasecurity/tracee/types/detect"
"github.com/aquasecurity/tracee/types/protocol"
"github.com/aquasecurity/tracee/types/trace"
)
//
// HOWTO: The way to trigger this test signature is to execute:
//
// nslookup -type=mx uol.com.br and then
// nslookup -type=ns uol.com.br and then
// nslookup -type=soa uol.com.br and then
// nslookup -type=txt uol.com.br
//
// This will cause it trigger once and reset it status.
type e2eDNS struct {
foundMX bool
foundNS bool
foundSOA bool
foundTXTs bool
cb detect.SignatureHandler
}
func (sig *e2eDNS) Init(cb detect.SignatureHandler) error {
sig.cb = cb
sig.foundMX = false // proforma
sig.foundNS = false // proforma
sig.foundSOA = false // proforma
sig.foundTXTs = false // proforma
return nil
}
func (sig *e2eDNS) GetMetadata() (detect.SignatureMetadata, error) {
return detect.SignatureMetadata{
ID: "DNS",
Version: "0.1.0",
Name: "Network DNS Test",
Description: "Network E2E Tests: DNS",
Tags: []string{"e2e", "network"},
}, nil
}
func (sig *e2eDNS) GetSelectedEvents() ([]detect.SignatureEventSelector, error) {
return []detect.SignatureEventSelector{
{Source: "tracee", Name: "net_packet_dns"},
}, nil
}
func (sig *e2eDNS) OnEvent(event protocol.Event) error {
eventObj, ok := event.Payload.(trace.Event)
if !ok {
return fmt.Errorf("failed to cast event's payload")
}
if eventObj.EventName == "net_packet_dns" {
dns, err := helpers.GetProtoDNSByName(eventObj, "proto_dns")
if err != nil {
return err
}
if len(dns.Answers) > 0 {
for _, answer := range dns.Answers {
// check if MX works
if answer.MX.Name == "mx.uol.com.br" && answer.MX.Preference == 10 {
sig.foundMX = true
}
// check if NS works
if answer.NS == "eliot.uol.com.br" {
sig.foundNS = true
}
// check if SOA works
if answer.SOA.RName == "root.uol.com.br" {
sig.foundSOA = true
}
// check if TXTs works
if answer.TXTs != nil && len(answer.TXTs) > 0 {
for _, txt := range answer.TXTs {
if strings.Contains(txt, "spf.uol.com.br") {
sig.foundTXTs = true
}
}
}
}
}
if !sig.foundMX || !sig.foundNS || !sig.foundSOA || !sig.foundTXTs {
return nil
}
if sig.foundMX && sig.foundNS && sig.foundSOA && sig.foundTXTs { // reset signature state
sig.foundMX = false
sig.foundNS = false
sig.foundSOA = false
sig.foundTXTs = false
}
m, _ := sig.GetMetadata()
sig.cb(detect.Finding{
SigMetadata: m,
Event: event,
Data: map[string]interface{}{},
})
}
return nil
}
func (sig *e2eDNS) OnSignal(s detect.Signal) error {
return nil
}
func (sig *e2eDNS) Close() {}