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/*
* This file is part of caronte (https://github.com/eciavatta/caronte).
* Copyright (c) 2020 Emiliano Ciavatta.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package main
import (
"context"
"encoding/binary"
"github.com/flier/gohs/hyperscan"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/google/gopacket/tcpassembly"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"math/rand"
"net"
"testing"
"time"
)
func TestTakeReleaseScanners(t *testing.T) {
wrapper := NewTestStorageWrapper(t)
serverNet := ParseIPNet(testDstIP)
ruleManager := TestRulesManager{
databaseUpdated: make(chan RulesDatabase),
}
database, err := hyperscan.NewStreamDatabase(hyperscan.NewPattern("/nope/", 0))
require.NoError(t, err)
factory := NewBiDirectionalStreamFactory(wrapper.Storage, *serverNet, &ruleManager)
version := NewRowID()
ruleManager.DatabaseUpdateChannel() <- RulesDatabase{database, 0, version}
time.Sleep(10 * time.Millisecond)
n := 1000
for i := 0; i < n; i++ {
scanner := factory.takeScanner()
assert.Equal(t, scanner.version, version)
if i%50 == 0 {
version = NewRowID()
ruleManager.DatabaseUpdateChannel() <- RulesDatabase{database, 0, version}
time.Sleep(10 * time.Millisecond)
}
factory.releaseScanner(scanner)
}
assert.Len(t, factory.scanners, 1)
scanners := make([]Scanner, n)
for i := 0; i < n; i++ {
scanners[i] = factory.takeScanner()
assert.Equal(t, scanners[i].version, version)
}
for i := 0; i < n; i++ {
factory.releaseScanner(scanners[i])
}
assert.Len(t, factory.scanners, n)
version = NewRowID()
ruleManager.DatabaseUpdateChannel() <- RulesDatabase{database, 0, version}
time.Sleep(10 * time.Millisecond)
for i := 0; i < n; i++ {
scanners[i] = factory.takeScanner()
assert.Equal(t, scanners[i].version, version)
factory.releaseScanner(scanners[i])
}
close(ruleManager.DatabaseUpdateChannel())
wrapper.Destroy(t)
}
func TestConnectionFactory(t *testing.T) {
wrapper := NewTestStorageWrapper(t)
wrapper.AddCollection(Connections)
wrapper.AddCollection(ConnectionStreams)
ruleManager := TestRulesManager{
databaseUpdated: make(chan RulesDatabase),
}
clientIP := layers.NewIPEndpoint(net.ParseIP(testSrcIP))
serverIP := layers.NewIPEndpoint(net.ParseIP(testDstIP))
serverPort := layers.NewTCPPortEndpoint(dstPort)
clientServerNetFlow, err := gopacket.FlowFromEndpoints(clientIP, serverIP)
require.NoError(t, err)
serverClientNetFlow, err := gopacket.FlowFromEndpoints(serverIP, clientIP)
require.NoError(t, err)
database, err := hyperscan.NewStreamDatabase(hyperscan.NewPattern("/nope/", 0))
require.NoError(t, err)
factory := NewBiDirectionalStreamFactory(wrapper.Storage, *ParseIPNet(testDstIP), &ruleManager)
version := NewRowID()
ruleManager.DatabaseUpdateChannel() <- RulesDatabase{database, 0, version}
time.Sleep(10 * time.Millisecond)
testInteraction := func(netFlow gopacket.Flow, transportFlow gopacket.Flow, otherSeenChan chan time.Time,
completed chan bool) {
time.Sleep(time.Duration(rand.Intn(1000)) * time.Millisecond)
stream := factory.New(netFlow, transportFlow)
seen := time.Now()
stream.Reassembled([]tcpassembly.Reassembly{{[]byte{}, 0, true, true, seen}})
stream.ReassemblyComplete()
var startedAt, closedAt time.Time
if netFlow == serverClientNetFlow {
otherSeenChan <- seen
return
}
otherSeen, ok := <-otherSeenChan
require.True(t, ok)
if seen.Before(otherSeen) {
startedAt = seen
closedAt = otherSeen
} else {
startedAt = otherSeen
closedAt = seen
}
close(otherSeenChan)
var result Connection
connectionFlow := StreamFlow{netFlow.Src(), netFlow.Dst(), transportFlow.Src(), transportFlow.Dst()}
connectionID := CustomRowID(connectionFlow.Hash(), startedAt)
op := wrapper.Storage.Find(Connections).Context(wrapper.Context)
err := op.Filter(OrderedDocument{{"_id", connectionID}}).First(&result)
require.NoError(t, err)
assert.NotNil(t, result)
assert.Equal(t, CustomRowID(connectionFlow.Hash(), result.StartedAt), result.ID)
assert.Equal(t, netFlow.Src().String(), result.SourceIP)
assert.Equal(t, netFlow.Dst().String(), result.DestinationIP)
assert.Equal(t, binary.BigEndian.Uint16(transportFlow.Src().Raw()), result.SourcePort)
assert.Equal(t, binary.BigEndian.Uint16(transportFlow.Dst().Raw()), result.DestinationPort)
assert.Equal(t, startedAt.Unix(), result.StartedAt.Unix())
assert.Equal(t, closedAt.Unix(), result.ClosedAt.Unix())
completed <- true
}
completed := make(chan bool)
n := 1000
for port := 40000; port < 40000+n; port++ {
clientPort := layers.NewTCPPortEndpoint(layers.TCPPort(port))
clientServerTransportFlow, err := gopacket.FlowFromEndpoints(clientPort, serverPort)
require.NoError(t, err)
serverClientTransportFlow, err := gopacket.FlowFromEndpoints(serverPort, clientPort)
require.NoError(t, err)
otherSeenChan := make(chan time.Time)
go testInteraction(clientServerNetFlow, clientServerTransportFlow, otherSeenChan, completed)
go testInteraction(serverClientNetFlow, serverClientTransportFlow, otherSeenChan, completed)
}
timeout := time.Tick(10 * time.Second)
for i := 0; i < n; i++ {
select {
case <-completed:
continue
case <-timeout:
t.Fatal("timeout")
}
}
assert.Len(t, factory.connections, 0)
close(ruleManager.DatabaseUpdateChannel())
wrapper.Destroy(t)
}
type TestRulesManager struct {
databaseUpdated chan RulesDatabase
}
func (rm TestRulesManager) LoadRules() error {
return nil
}
func (rm TestRulesManager) AddRule(_ context.Context, _ Rule) (RowID, error) {
return RowID{}, nil
}
func (rm TestRulesManager) DeleteRule(_ context.Context, _ RowID) error {
return nil
}
func (rm TestRulesManager) GetRule(_ RowID) (Rule, bool) {
return Rule{}, false
}
func (rm TestRulesManager) UpdateRule(_ context.Context, _ RowID, _ Rule) (bool, error) {
return false, nil
}
func (rm TestRulesManager) GetRules() []Rule {
return nil
}
func (rm TestRulesManager) SetFlag(_ context.Context, _ string) error {
return nil
}
func (rm TestRulesManager) FillWithMatchedRules(_ *Connection, _ map[uint][]PatternSlice, _ map[uint][]PatternSlice) {
}
func (rm TestRulesManager) DatabaseUpdateChannel() chan RulesDatabase {
return rm.databaseUpdated
}
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