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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| # Test Description | ||
|
|
||
| Test earlier alert matches after trigger raw stream reassembly when there's a | ||
| completed DNS TCP transaction. | ||
|
|
||
| ## PCAP | ||
|
|
||
| dns-tcp-multi.pcap, crafted for this test, shared in the Redmine ticket. | ||
|
|
||
| ## Behavior | ||
|
|
||
| The capture shows three request-response DNS transactions: | ||
| Query 1: suricata.io | ||
| Query 2: oisf.net | ||
| Query 3: suricata.org | ||
|
|
||
| We match those against a single payload rule without any DNS keywords, | ||
| and inspecting content `suricata|02|`. Ideally, the expectation is to have 2 alerts, | ||
| for the portion of the stream associated with Query 1 - that's because on the | ||
| wire we observe that for Query three the content is `suricata|03|`. | ||
|
|
||
| ## Related issues | ||
|
|
||
| https://redmine.openinfosecfoundation.org/issues/7018 | ||
| https://redmine.openinfosecfoundation.org/issues/7004 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| # This rule will only match on the first DNS transaction that contains | ||
| # `suricata`, as the second is followed by |03| | ||
| alert dns any any -> any any (msg:"DNS suricata query - payload rule"; content:"suricata|02|"; sid:1; rev:1;) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,205 @@ | ||
| args: | ||
| - -k none | ||
|
|
||
| pcap: ../bug-7004-ids-dns-keywords/input.pcap | ||
|
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||
| checks: | ||
| - filter: | ||
| min-version: 7 | ||
| count: 2 | ||
| match: | ||
| event_type: alert | ||
| - filter: | ||
| min-version: 8 | ||
| count: 1 | ||
| match: | ||
| event_type: alert | ||
| pcap_cnt: 7 | ||
| alert.signature: DNS suricata query - payload rule | ||
| alert.signature_id: 1 | ||
| proto: TCP | ||
| src_ip: 10.16.1.11 | ||
| src_port: 36926 | ||
| app_proto: dns | ||
| dest_ip: 9.9.9.9 | ||
| dest_port: 53 | ||
| direction: to_server | ||
| - filter: | ||
| min-version: 8 | ||
| count: 1 | ||
| match: | ||
| event_type: alert | ||
| pcap_cnt: 9 | ||
| alert.signature: DNS suricata query - payload rule | ||
| alert.signature_id: 1 | ||
| app_proto: dns | ||
| proto: TCP | ||
| src_ip: 9.9.9.9 | ||
| src_port: 53 | ||
| dest_ip: 10.16.1.11 | ||
| dest_port: 36926 | ||
| direction: to_client | ||
| - filter: | ||
| count: 1 | ||
| match: | ||
| event_type: dns | ||
| pcap_cnt: 5 | ||
| dest_ip: 9.9.9.9 | ||
| dest_port: 53 | ||
| dns.id: 0 | ||
| dns.opcode: 0 | ||
| dns.rrname: suricata.io | ||
| dns.rrtype: A | ||
| dns.tx_id: 0 | ||
| dns.type: query | ||
| proto: TCP | ||
| src_ip: 10.16.1.11 | ||
| src_port: 36926 | ||
| - filter: | ||
| count: 1 | ||
| match: | ||
| event_type: dns | ||
| pcap_cnt: 7 | ||
| proto: TCP | ||
| src_ip: 10.16.1.11 | ||
| src_port: 36926 | ||
| dest_ip: 9.9.9.9 | ||
| dest_port: 53 | ||
| dns.answers[0].rdata: 35.212.0.44 | ||
| dns.answers[0].rrname: suricata.io | ||
| dns.answers[0].rrtype: A | ||
| dns.answers[0].ttl: 490 | ||
| dns.flags: '8180' | ||
| dns.grouped.A[0]: 35.212.0.44 | ||
| dns.id: 0 | ||
| dns.opcode: 0 | ||
| dns.qr: true | ||
| dns.ra: true | ||
| dns.rcode: NOERROR | ||
| dns.rd: true | ||
| dns.rrname: suricata.io | ||
| dns.rrtype: A | ||
| dns.type: answer | ||
| dns.version: 2 | ||
| - filter: | ||
| count: 1 | ||
| match: | ||
| event_type: dns | ||
| pcap_cnt: 9 | ||
| proto: TCP | ||
| src_ip: 10.16.1.11 | ||
| src_port: 36926 | ||
| dest_ip: 9.9.9.9 | ||
| dest_port: 53 | ||
| dns.id: 0 | ||
| dns.opcode: 0 | ||
| dns.rrname: oisf.net | ||
| dns.rrtype: A | ||
| dns.tx_id: 2 | ||
| dns.type: query | ||
| - filter: | ||
| count: 1 | ||
| match: | ||
| event_type: dns | ||
| pcap_cnt: 10 | ||
| proto: TCP | ||
| src_ip: 10.16.1.11 | ||
| src_port: 36926 | ||
| dest_ip: 9.9.9.9 | ||
| dest_port: 53 | ||
| dns.answers[0].rdata: 192.0.78.190 | ||
| dns.answers[0].rrname: oisf.net | ||
| dns.answers[0].rrtype: A | ||
| dns.answers[0].ttl: 207 | ||
| dns.answers[1].rdata: 192.0.78.209 | ||
| dns.answers[1].rrname: oisf.net | ||
| dns.answers[1].rrtype: A | ||
| dns.answers[1].ttl: 207 | ||
| dns.flags: '8180' | ||
| dns.grouped.A[0]: 192.0.78.190 | ||
| dns.grouped.A[1]: 192.0.78.209 | ||
| dns.id: 0 | ||
| dns.opcode: 0 | ||
| dns.qr: true | ||
| dns.ra: true | ||
| dns.rcode: NOERROR | ||
| dns.rd: true | ||
| dns.rrname: oisf.net | ||
| dns.rrtype: A | ||
| dns.type: answer | ||
| dns.version: 2 | ||
| - filter: | ||
| count: 1 | ||
| match: | ||
| event_type: dns | ||
| pcap_cnt: 11 | ||
| proto: TCP | ||
| src_ip: 10.16.1.11 | ||
| src_port: 36926 | ||
| dest_ip: 9.9.9.9 | ||
| dest_port: 53 | ||
| dns.id: 0 | ||
| dns.opcode: 0 | ||
| dns.rrname: suricata.org | ||
| dns.rrtype: A | ||
| dns.tx_id: 4 | ||
| dns.type: query | ||
| - filter: | ||
| count: 1 | ||
| match: | ||
| event_type: dns | ||
| pcap_cnt: 12 | ||
| proto: TCP | ||
| src_ip: 10.16.1.11 | ||
| src_port: 36926 | ||
| dest_ip: 9.9.9.9 | ||
| dest_port: 53 | ||
| dns.answers[0].rdata: 15.197.148.33 | ||
| dns.answers[0].rrname: suricata.org | ||
| dns.answers[0].rrtype: A | ||
| dns.answers[0].ttl: 600 | ||
| dns.answers[1].rdata: 3.33.130.190 | ||
| dns.answers[1].rrname: suricata.org | ||
| dns.answers[1].rrtype: A | ||
| dns.answers[1].ttl: 600 | ||
| dns.flags: '8180' | ||
| dns.grouped.A[0]: 15.197.148.33 | ||
| dns.grouped.A[1]: 3.33.130.190 | ||
| dns.id: 0 | ||
| dns.opcode: 0 | ||
| dns.qr: true | ||
| dns.ra: true | ||
| dns.rcode: NOERROR | ||
| dns.rd: true | ||
| dns.rrname: suricata.org | ||
| dns.rrtype: A | ||
| dns.type: answer | ||
| dns.version: 2 | ||
| - filter: | ||
| count: 1 | ||
| match: | ||
| event_type: flow | ||
| app_proto: dns | ||
| proto: TCP | ||
| src_ip: 10.16.1.11 | ||
| src_port: 36926 | ||
| dest_ip: 9.9.9.9 | ||
| dest_port: 53 | ||
| flow.age: 0 | ||
| flow.alerted: true | ||
| flow.bytes_toclient: 575 | ||
| flow.bytes_toserver: 627 | ||
| flow.pkts_toclient: 6 | ||
| flow.pkts_toserver: 8 | ||
| flow.reason: shutdown | ||
| flow.state: closed | ||
| tcp.ack: true | ||
| tcp.fin: true | ||
| tcp.psh: true | ||
| tcp.state: closed | ||
| tcp.syn: true | ||
| tcp.tc_max_regions: 1 | ||
| tcp.tcp_flags: 1b | ||
| tcp.tcp_flags_tc: 1b | ||
| tcp.tcp_flags_ts: 1b | ||
| tcp.ts_max_regions: 1 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| # Test Description | ||
|
|
||
| Test earlier alert matches after trigger raw stream reassembly when there's a | ||
| completed DNS TCP transaction. | ||
|
|
||
| ## PCAP | ||
|
|
||
| dns-tcp-multi.pcap, crafted for this test, shared in the Redmine ticket. | ||
|
|
||
| The capture shows three request-response DNS transactions: | ||
| Query 1: suricata.io | ||
| Query 2: oisf.net | ||
| Query 3: suricata.org | ||
|
|
||
| ## Behavior | ||
|
|
||
| We match those against a single payload rule without any DNS keywords, | ||
| and inspecting content `suricata|02|`. Ideally, the expectation is to have 2 alerts, | ||
| for the portion of the stream associated with Query 1 - that's because on the | ||
| wire we observe that for Query three the content is `suricata|03|`. | ||
|
|
||
| For IPS mode, as a larger portion of the stream buffer is kept available, and as | ||
| it still contains the matching bytes, we'll see more alerts triggered. | ||
|
|
||
| ## Related issues | ||
|
|
||
| https://redmine.openinfosecfoundation.org/issues/7018 | ||
| https://redmine.openinfosecfoundation.org/issues/7004 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| # This rule will only match on the first DNS transaction that contains | ||
| # `suricata`, as the second is followed by |03| | ||
| alert dns any any -> any any (msg:"DNS suricata query - payload rule"; content:"suricata|02|"; sid:1; rev:1;) |
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