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fixed trigger out of bounds panic, test all strategies w/ pcap file (file not included) #7

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merged 3 commits into from
Mar 2, 2024
Merged

fixed trigger out of bounds panic, test all strategies w/ pcap file (file not included) #7

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7bdc7fa
fixed trigger out of bounds panic, test all strategies w/ pcap file
garmr-ulfr Feb 29, 2024
ce00cfb
skipping TestApplyAllStrategies until input.pcap file added
garmr-ulfr Mar 1, 2024
0096280
fix expected value for ip trigger test
garmr-ulfr Mar 1, 2024
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1 change: 1 addition & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
/geneva
/geneva.exe
profile.cov
/internal/testdata/input.pcap
28 changes: 17 additions & 11 deletions actions/tamper_action.go
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Original file line number Diff line number Diff line change
Expand Up @@ -236,7 +236,7 @@ var (
"dataofs": TCPFieldDataOff,
"flags": TCPFieldFlags,
"window": TCPFieldWindow,
"urgent": TCPFieldUrgent,
"urgptr": TCPFieldUrgent,
"chksum": TCPFieldChecksum,
"options-eol": TCPOptionEol,
"options-nop": TCPOptionNop,
Expand All @@ -253,8 +253,8 @@ var (

// tcpOptionLengths is a map of TCP options to the length of their data field.
tcpOptionLengths = map[TCPField]int{
TCPOptionEol: 0,
TCPOptionNop: 0,
TCPOptionEol: 1,
TCPOptionNop: 1,
TCPOptionMss: 2,
TCPOptionWscale: 1,
TCPOptionSackok: 0, // the geneva team has this listed as 0, so at most the data is deleted
Expand Down Expand Up @@ -313,14 +313,20 @@ func NewTCPTamperAction(ta TamperAction) (*TCPTamperAction, error) {
case field == TCPLoad:
gen.vBytes = []byte(ta.NewValue)
default:
val, err := strconv.ParseUint(ta.NewValue, 10, 32)
if err != nil {
return nil, fmt.Errorf(
"%w: %q is not a valid value for field %q",
ErrInvalidTamperRule,
ta.NewValue,
ta.Field,
)
var (
val uint64
err error
)
if ta.NewValue != "" {
val, err = strconv.ParseUint(ta.NewValue, 10, 32)
if err != nil {
return nil, fmt.Errorf(
"%w: %q is not a valid value for field %q",
ErrInvalidTamperRule,
ta.NewValue,
ta.Field,
)
}
}

gen.vUint = uint32(val)
Expand Down
72 changes: 42 additions & 30 deletions geneva_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3,43 +3,55 @@ package geneva_test
import (
"testing"

"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/google/gopacket/pcap"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"

"github.com/getlantern/geneva"
"github.com/getlantern/geneva/strategy"
)

var examples = []string{
"[TCP:flags:PA]-duplicate(tamper{TCP:dataofs:replace:10}(tamper{TCP:chksum:corrupt},),)-|",
"[TCP:flags:PA]-duplicate(tamper{TCP:dataofs:replace:10}(tamper{IP:ttl:replace:10},),)-|",
"[TCP:flags:PA]-duplicate(tamper{TCP:dataofs:replace:10}(tamper{TCP:ack:corrupt},),)-|",
"[TCP:flags:PA]-duplicate(tamper{TCP:options-wscale:corrupt}(tamper{TCP:dataofs:replace:8},),)-|",
"[TCP:flags:PA]-duplicate(tamper{TCP:load:corrupt}(tamper{TCP:chksum:corrupt},),)-|",
"[TCP:flags:PA]-duplicate(tamper{TCP:load:corrupt}(tamper{IP:ttl:replace:8},),)-|",
"[TCP:flags:PA]-duplicate(tamper{TCP:load:corrupt}(tamper{TCP:ack:corrupt},),)-|",
"[TCP:flags:S]-duplicate(,tamper{TCP:load:corrupt})-|",
"[TCP:flags:PA]-duplicate(tamper{IP:len:replace:64},)-|",
"[TCP:flags:A]-duplicate(,tamper{TCP:flags:replace:R}(tamper{TCP:chksum:corrupt},))-|",
"[TCP:flags:A]-duplicate(,tamper{TCP:flags:replace:R}(tamper{IP:ttl:replace:10},))-|",
"[TCP:flags:A]-duplicate(,tamper{TCP:options-md5header:corrupt}(tamper{TCP:flags:replace:R},))-|",
"[TCP:flags:A]-duplicate(,tamper{TCP:flags:replace:RA}(tamper{TCP:chksum:corrupt},))-|",
"[TCP:flags:A]-duplicate(,tamper{TCP:flags:replace:RA}(tamper{IP:ttl:replace:10},))-|",
"[TCP:flags:A]-duplicate(,tamper{TCP:options-md5header:corrupt}(tamper{TCP:flags:replace:R},))-|",
"[TCP:flags:A]-duplicate(,tamper{TCP:flags:replace:FRAPUEN}(tamper{TCP:chksum:corrupt},))-|",
"[TCP:flags:A]-duplicate(,tamper{TCP:flags:replace:FREACN}(tamper{IP:ttl:replace:10},))-|",
"[TCP:flags:A]-duplicate(,tamper{TCP:flags:replace:FRAPUN}(tamper{TCP:options-md5header:corrupt},))-|",
"[TCP:flags:PA]-fragment{tcp:8:False}-| [TCP:flags:A]-tamper{TCP:seq:corrupt}-|",
"[TCP:flags:PA]-fragment{tcp:8:True}(,fragment{tcp:4:True})-|",
"[TCP:flags:PA]-fragment{tcp:-1:True}-|",
"[TCP:flags:PA]-duplicate(tamper{TCP:flags:replace:F}(tamper{IP:len:replace:78},),)-|",
"[TCP:flags:S]-duplicate(tamper{TCP:flags:replace:SA},)-|",
"[TCP:flags:PA]-tamper{TCP:options-uto:corrupt}-|",
}

func TestNewStrategy(t *testing.T) {
t.Parallel()

for i, s := range examples {
for i, s := range geneva.Strategies {
_, err := geneva.NewStrategy(s)
if err != nil {
t.Errorf("failed to parse strategy %d %q: %v", i, s, err)
assert.NoError(t, err, "failed to parse strategy %d %q", i, s)
}
}

func TestApplyAllStrategies(t *testing.T) {
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If we're not going to ship internal/testdata/input.pcap (and it makes sense to me why we're not right now), what do you think about adding t.Skip("no input.pcap file") at the head of this test so that it doesn't interfere with anyone running the tests after an initial clone?

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Good point. Adding it.

t.Parallel()

t.Log("reading pcap file")

packets := []gopacket.Packet{}
handle, err := pcap.OpenOffline("internal/testdata/input.pcap")
require.NoError(t, err, "failed to open pcap file")

packetSource := gopacket.NewPacketSource(handle, handle.LinkType())
for packet := range packetSource.Packets() {
packets = append(packets, packet)
}

t.Log("parsing strategies")

strategies := []*strategy.Strategy{}
for _, s := range geneva.Strategies {
strat, err := geneva.NewStrategy(s)
assert.NoError(t, err, "failed to parse strategy %q", s)
strategies = append(strategies, strat)
}

t.Log("applying strategies")

for _, s := range strategies {
for _, p := range packets {
p := gopacket.NewPacket(p.Data(), layers.LayerTypeEthernet, gopacket.Default)
_, err := s.Apply(p, strategy.DirectionOutbound)
assert.NoError(t, err, "strategy: %s\n%v", s, p)
}
}
}
67 changes: 67 additions & 0 deletions strategies.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,67 @@
package geneva

var Strategies = []string{
"[TCP:flags:PA]-duplicate(tamper{TCP:dataofs:replace:10}(tamper{TCP:chksum:corrupt},),)-| \\/",
"[TCP:flags:PA]-duplicate(tamper{TCP:dataofs:replace:10}(tamper{IP:ttl:replace:10},),)-| \\/",
"[TCP:flags:PA]-duplicate(tamper{TCP:dataofs:replace:10}(tamper{TCP:ack:corrupt},),)-| \\/",
"[TCP:flags:PA]-duplicate(tamper{TCP:options-wscale:corrupt}(tamper{TCP:dataofs:replace:8},),)-| \\/",
"[TCP:flags:PA]-duplicate(tamper{TCP:load:corrupt}(tamper{TCP:chksum:corrupt},),)-| \\/",
"[TCP:flags:PA]-duplicate(tamper{TCP:load:corrupt}(tamper{IP:ttl:replace:8},),)-| \\/",
"[TCP:flags:PA]-duplicate(tamper{TCP:load:corrupt}(tamper{TCP:ack:corrupt},),)-| \\/",
"[TCP:flags:S]-duplicate(,tamper{TCP:load:corrupt})-| \\/",
"[TCP:flags:PA]-duplicate(tamper{IP:len:replace:64},)-| \\/",
"[TCP:flags:A]-duplicate(,tamper{TCP:flags:replace:R}(tamper{TCP:chksum:corrupt},))-| \\/",
"[TCP:flags:A]-duplicate(,tamper{TCP:flags:replace:R}(tamper{IP:ttl:replace:10},))-| \\/",
"[TCP:flags:A]-duplicate(,tamper{TCP:options-md5header:corrupt}(tamper{TCP:flags:replace:R},))-| \\/",
"[TCP:flags:A]-duplicate(,tamper{TCP:flags:replace:RA}(tamper{TCP:chksum:corrupt},))-| \\/",
"[TCP:flags:A]-duplicate(,tamper{TCP:flags:replace:RA}(tamper{IP:ttl:replace:10},))-| \\/",
"[TCP:flags:A]-duplicate(,tamper{TCP:options-md5header:corrupt}(tamper{TCP:flags:replace:R},))-| \\/",
"[TCP:flags:A]-duplicate(,tamper{TCP:flags:replace:FRAPUEN}(tamper{TCP:chksum:corrupt},))-| \\/",
"[TCP:flags:A]-duplicate(,tamper{TCP:flags:replace:FREACN}(tamper{IP:ttl:replace:10},))-| \\/",
"[TCP:flags:A]-duplicate(,tamper{TCP:flags:replace:FRAPUN}(tamper{TCP:options-md5header:corrupt},))-| \\/",
"[TCP:flags:PA]-fragment{tcp:8:False}-| [TCP:flags:A]-tamper{TCP:seq:corrupt}-| \\/",
"[TCP:flags:PA]-fragment{tcp:8:True}(,fragment{tcp:4:True})-| \\/",
"[TCP:flags:PA]-fragment{tcp:-1:True}-| \\/",
"[TCP:flags:PA]-duplicate(tamper{TCP:flags:replace:F}(tamper{IP:len:replace:78},),)-| \\/",
"[TCP:flags:S]-duplicate(tamper{TCP:flags:replace:SA},)-| \\/",
"[TCP:flags:PA]-tamper{TCP:options-uto:corrupt}-| \\/",

"[TCP:options-sackok:]-tamper{TCP:dataofs:replace:7}-| \\/",
"[TCP:options-sack::4]-fragment{tcp:-1:False}-| \\/",
"[TCP:options-nop:]-tamper{TCP:urgptr:corrupt}(tamper{TCP:options-eol:corrupt},)-| \\/",
"[TCP:options-nop:]-fragment{ip:-1:True:9}(drop,)-| \\/",
"[TCP:urgptr:0]-duplicate-| \\/",
"[TCP:dataofs:10:3]-tamper{TCP:options-mss:replace:17484}(fragment{tcp:-1:False},)-| \\/",
"[TCP:options-sack:]-tamper{TCP:window:corrupt}(tamper{TCP:options-eol:corrupt},)-| \\/",
"[TCP:options-altchksum:]-duplicate(fragment{ip:-1:False},)-| \\/",
"[TCP:options-altchksumopt:]-fragment{tcp:-1:True}-| \\/",
"[TCP:dataofs:8]-duplicate(duplicate,)-| \\/",
"[TCP:options-md5header:]-duplicate-| \\/",
"[TCP:options-md5header:]-fragment{tcp:-1:False}-| [TCP:options-wscale:7]-drop-| \\/",
"[TCP:options-uto:]-duplicate(,tamper{TCP:load:replace:y0qgai1woz})-| \\/",
"[TCP:options-sackok::1]-tamper{TCP:window:replace:120}(tamper{TCP:ack:corrupt},)-| \\/",
"[TCP:load:]-tamper{TCP:options-uto:corrupt}(fragment{tcp:-1:False},)-| [TCP:options-uto:]-tamper{TCP:options-mss:replace:}-| \\/",
"[TCP:options-wscale:]-tamper{TCP:options-nop:corrupt}(tamper{TCP:options-altchksum:replace:},)-| \\/",
"[TCP:options-sack::1]-tamper{TCP:chksum:replace:22170}-| \\/",
"[TCP:load:]-fragment{tcp:-1:False}(tamper{TCP:urgptr:replace:29},)-| \\/",
"[TCP:urgptr:0]-fragment{tcp:-1:False}(duplicate,tamper{TCP:options-sackok:replace:})-| \\/",
"[TCP:options-eol:]-tamper{TCP:window:corrupt}-| \\/",
"[TCP:options-uto:]-tamper{TCP:options-altchksum:replace:90}(duplicate(tamper{TCP:options-sack:replace:},),)-| \\/",
"[TCP:options-altchksumopt:]-tamper{TCP:options-uto:replace:}(tamper{TCP:load:corrupt}(fragment{tcp:-1:True}(,drop),),)-| \\/",
"[TCP:options-altchksumopt:]-fragment{tcp:-1:False}(drop,duplicate)-| \\/",
"[TCP:options-eol:]-tamper{TCP:urgptr:corrupt}(duplicate,)-| \\/",
"[TCP:options-sack:]-duplicate(tamper{TCP:urgptr:corrupt}(fragment{tcp:-1:False},),)-| \\/",
"[TCP:options-nop::2]-fragment{tcp:46:True}(fragment{tcp:-1:True},)-| \\/",
"[TCP:chksum:26741]-duplicate(tamper{TCP:options-timestamp:replace:},)-| \\/",
"[TCP:options-uto:]-duplicate(,tamper{TCP:options-nop:replace:})-| \\/",
"[TCP:options-altchksum:]-tamper{TCP:options-wscale:replace:248}(tamper{TCP:options-sackok:replace:},)-| \\/",
"[TCP:options-sackok:]-duplicate(duplicate(,tamper{TCP:load:replace:GET%20/%3Fq%3Dultrasurf%20HTTP/1.1%0D%0AHost%3A%2023.88.46.143%3A4228%0D%0AUser-Agent%3A%20python-requests/2.23.0%0D%0AAccept-Encoding%3A%20gzip%2C%20deflate%0D%0AAccept%3A%20%2A/%2A%0D%0AConnection%3A%20keep-alive%0D%0A%0D%0A}),duplicate)-| \\/",
"[TCP:options-sackok::1]-fragment{tcp:29:False:14}(tamper{TCP:options-timestamp:replace:4263716593},)-| \\/",
"[TCP:options-altchksumopt:]-tamper{TCP:options-nop:corrupt}(duplicate,)-| \\/",

// Can't find where these Strategies came from. They are not in the geneva paper or the geneva team's repo.
// "[TCP:reserved:0]-fragment{tcp:-1:True}(,tamper{TCP:options-uto:replace:})-| \\/",
// "[TCP:options-nop:]-tamper{TCP:load:replace:}(tamper{TCP:reserved:corrupt}(tamper{TCP:options-sackok:corrupt},),)-| \\/",
// "[TCP:options-sack:]-fragment{tcp:-1:True}(,tamper{TCP:reserved:replace:1})-| \\/",
// "[TCP:reserved:0]-duplicate(tamper{TCP:options-sackok:corrupt},)-| \\/",
}
61 changes: 0 additions & 61 deletions strategies.txt
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This file was deleted.

13 changes: 2 additions & 11 deletions triggers/ip_trigger.go
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
package triggers

import (
"bytes"
"fmt"
"net"
"strconv"
Expand Down Expand Up @@ -110,17 +111,7 @@ func (t *IPTrigger) Matches(pkt gopacket.Packet) (bool, error) {
case IPFieldDestAddress:
return ipLayer.DstIP.Equal(net.ParseIP(t.value)), nil
case IPFieldPayload:
if len(ipLayer.Payload) < len(t.value) {
return false, nil
}

for i, r := range []byte(t.value) {
if r != ipLayer.Payload[i] {
return false, nil
}
}

return true, nil
return bytes.Equal(ipLayer.Payload, []byte(t.value)), nil
}

// The rest of the triggers work on numbers.
Expand Down
26 changes: 3 additions & 23 deletions triggers/tcp_trigger.go
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
package triggers

import (
"bytes"
"errors"
"fmt"
"math"
Expand Down Expand Up @@ -182,17 +183,7 @@ func matchTCPOption(field TCPField, value string, tcpLayer *layers.TCP) (bool, e

for _, opt := range tcpLayer.Options {
if opt.OptionType == optKind {
if len(opt.OptionData) < len(value) {
return false, nil
}

for i, b := range opt.OptionData {
if b != []byte(value)[i] {
return false, nil
}
}

return true, nil
return bytes.Equal(opt.OptionData, []byte(value)), nil
}
}

Expand All @@ -210,18 +201,7 @@ func (t *TCPTrigger) Matches(pkt gopacket.Packet) (bool, error) {
case TCPFieldFlags:
return matchField(t.value, tcpLayer), nil
case TCPFieldPayload:
if len(tcpLayer.Payload) < len(t.value) {
return false, nil
}

for i, r := range []byte(t.value) {
if r != tcpLayer.Payload[i] {
return false, nil
}
}

return true, nil

return bytes.Equal(tcpLayer.Payload, []byte(t.value)), nil
case TCPFieldOptionEOL, TCPFieldOptionNOP, TCPFieldOptionMSS, TCPFieldOptionWScale,
TCPFieldOptionSackOk, TCPFieldOptionSack, TCPFieldOptionTimestamp,
TCPFieldOptionAltChecksum, TCPFieldOptionAltChecksumOpt, TCPFieldOptionMD5Header,
Expand Down
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