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Overview

Tracee offers a set of network events that makes it easy to trace network activity in common protocols.

Available network events

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.data.dst_port=80

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Trace all DNS packets received ONLY from Google DNS server '8.8.8.8':

tracee --output json --events net_packet_dns.data.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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Network Based Signatures

It is possible to create Golang 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.

  1. 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() {}