Init

cmd/bgpfuzz/main.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"flag"
+	"os"
+
+	"github.com/bio-routing/bgpfuzz/pkg/bgpfuzz"
+	log "github.com/sirupsen/logrus"
+)
+
+var (
+	targetStr = flag.String("target", "", "IP-Address of peer")
+	localASN  = flag.Uint("local_asn", 0, "Local ASN")
+)
+
+func main() {
+	flag.Parse()
+
+	f := bgpfuzz.New(*targetStr, uint16(*localASN))
+	err := f.TestOpen()
+	if err != nil {
+		log.Errorf("OPEN tests failed: %v", err)
+		os.Exit(1)
+	}
+}

go.mod

@@ -0,0 +1,10 @@
+module github.com/bio-routing/bgpfuzz
+
+go 1.13
+
+require (
+	github.com/bio-routing/bio-rd v0.0.0-20190917132728-59e01a4b8560
+	github.com/bio-routing/tflow2 v0.0.0-20190917141429-d470c7d82fcd
+	github.com/pkg/errors v0.8.1
+	github.com/sirupsen/logrus v1.4.2
+)

go.sum

@@ -0,0 +1,97 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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+github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
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pkg/bgpfuzz/bgp.go

@@ -0,0 +1,43 @@
+package bgpfuzz
+
+import (
+	"io"
+	"net"
+
+	"github.com/bio-routing/bio-rd/protocols/bgp/packet"
+	"github.com/pkg/errors"
+)
+
+var (
+	header = []byte{
+		255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+		0, 0, // Length
+		0, // Type
+	}
+
+	headerLengthOffset = 16
+	headerTypeOffset   = 18
+)
+
+func getHeader() []byte {
+	ret := make([]byte, 0, 19)
+	copy(ret, header)
+	return ret
+}
+
+func recvMsg(c net.Conn) (msg []byte, err error) {
+	buffer := make([]byte, packet.MaxLen)
+	_, err = io.ReadFull(c, buffer[0:packet.MinLen])
+	if err != nil {
+		return nil, errors.Wrap(err, "Read failed")
+	}
+
+	l := int(buffer[16])*256 + int(buffer[17])
+	toRead := l
+	_, err = io.ReadFull(c, buffer[packet.MinLen:toRead])
+	if err != nil {
+		return nil, errors.Wrap(err, "Read failed")
+	}
+
+	return buffer, nil
+}

pkg/bgpfuzz/fuzz.go

@@ -0,0 +1,17 @@
+package bgpfuzz
+
+// Fuzzer represents a fuzzer
+type Fuzzer struct {
+	target   string
+	localASN uint16
+	history  []byte
+}
+
+// New creates a new fuzzer
+func New(target string, localASN uint16) *Fuzzer {
+	return &Fuzzer{
+		target:   target,
+		localASN: localASN,
+		history:  make([]byte, 0, 10000),
+	}
+}

pkg/bgpfuzz/open.go

@@ -0,0 +1,154 @@
+package bgpfuzz
+
+import (
+	"bytes"
+	"fmt"
+	"net"
+
+	"github.com/bio-routing/bio-rd/protocols/bgp/packet"
+	"github.com/bio-routing/tflow2/convert"
+)
+
+const (
+	openMsgType   = 1
+	versionOffset = 0
+)
+
+var basicOpenMsg = []byte{
+	4,    // Version
+	0, 0, // ASN
+	0, 0, // Hold Time
+	192, 0, 2, 1, // BGP Identifier
+	0, // Opt param len
+}
+
+func (f *Fuzzer) getValidOpenMsg() []byte {
+	msg := make([]byte, 0, 10)
+	copy(msg, basicOpenMsg)
+	y := f.localASN % 256
+	x := f.localASN - y
+	msg[1] = uint8(x)
+	msg[2] = uint8(y)
+	return msg
+}
+
+func (f *Fuzzer) invalidVersionNumber() []byte {
+	m := f.getValidOpenMsg()
+	m[versionOffset] = 5
+
+	return m
+}
+
+func (f *Fuzzer) invalidASN() []byte {
+	m := f.getValidOpenMsg()
+	m[1] = 0
+	m[2] = 0
+
+	return m
+}
+
+func (f *Fuzzer) invalidBGPIdentifier() []byte {
+	m := f.getValidOpenMsg()
+	m[5] = 0
+	m[6] = 0
+	m[7] = 0
+	m[8] = 0
+
+	return m
+}
+
+func (f *Fuzzer) invalidOptParmLen() []byte {
+	m := f.getValidOpenMsg()
+	m[9] = 10
+
+	return m
+}
+
+// TestOpen performs tests around the BGP OPEN message
+func (f *Fuzzer) TestOpen() error {
+	tests := []struct {
+		name   string
+		packet []byte
+	}{
+		{
+			name:   "Invalid Version Number",
+			packet: f.invalidVersionNumber(),
+		},
+		{
+			name:   "Invalid ASN (0)",
+			packet: f.invalidASN(),
+		},
+		{
+			name:   "Invalid BGP Identifier",
+			packet: f.invalidBGPIdentifier(),
+		},
+		{
+			name:   "Invalid Opt. Param length",
+			packet: f.invalidOptParmLen(),
+		},
+	}
+
+	for _, test := range tests {
+		f.history = make([]byte, 0, 10000)
+
+		c, err := net.Dial("tcp", fmt.Sprintf("%s:179", f.target))
+		if err != nil {
+			return fmt.Errorf("dial failed for test %q: %v", test.name, err)
+		}
+
+		data, err := recvMsg(c)
+		if err != nil {
+			return fmt.Errorf("Unable receive message for test %q: %v", test.name, err)
+		}
+
+		msg, err := packet.Decode(bytes.NewBuffer(data), &packet.DecodeOptions{})
+		if err != nil {
+			return fmt.Errorf("Unable to decode message for test %q: %v", test.name, err)
+		}
+
+		hdr := getHeader()
+		hdr[headerTypeOffset] = openMsgType
+
+		l := convert.Uint16Byte(uint16(len(test.packet)))
+
+		hdr[headerLengthOffset] = l[0]
+		hdr[headerLengthOffset+1] = l[1]
+
+		f.history = append(f.history, hdr...)
+		_, err = c.Write(hdr)
+		if err != nil {
+			return fmt.Errorf("write failed for test %q: %v", test.name, err)
+		}
+
+		f.history = append(f.history, test.packet...)
+		_, err = c.Write(test.packet)
+		if err != nil {
+			return fmt.Errorf("write failed for test %q: %v", test.name, err)
+		}
+
+		data, err = recvMsg(c)
+		if err != nil {
+			fmt.Printf("Test %q:\n", test.name)
+			fmt.Printf("Read from socket failed after sending payload\n")
+			fmt.Printf("Error: %v\n", err)
+			fmt.Printf("Payload: %v\n", f.history)
+			return nil
+		}
+
+		msg, err = packet.Decode(bytes.NewBuffer(data), &packet.DecodeOptions{})
+		if err != nil {
+			return fmt.Errorf("Unable to decode message for test %q: %v", test.name, err)
+		}
+
+		if msg.Header.Type != packet.NotificationMsg {
+			fmt.Printf("Test %q:\n", test.name)
+			fmt.Printf("Target did not send expected NOTIFICATION message\n")
+			fmt.Printf("Payload: %v\n", f.history)
+			return nil
+		}
+
+		fmt.Printf("Test %q successful\n", test.name)
+	}
+
+	return nil
+}