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fuzzFunctions.go
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fuzzFunctions.go
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package main
import (
"bytes"
"crypto/md5"
"encoding/binary"
"math/rand"
"net"
"time"
fuzz "github.com/google/gofuzz"
"github.com/google/gopacket/layers"
)
// FuzzHardwareAddrValidFix sets the MAC address to a static value
func FuzzHardwareAddrValidFix(i *net.HardwareAddr, c fuzz.Continue) {
*i = net.HardwareAddr{0xcc, 0xaa, 0xff, 0xff, 0xee, 0xee}
}
// FuzzIPAddrValidRandom fuzzes a net.IP type with a syntactically correct address
func FuzzIPAddrValidRandom(i *net.IP, c fuzz.Continue) {
*i = net.IP{byte(rand.Intn(256)), byte(rand.Intn(256)), byte(rand.Intn(256)), byte(rand.Intn(256))}
}
// FuzzPCFLenValid sets the length of the PCFValue field to a valid value
// by calculating the length from the PCFLen field.
func FuzzPCFLenValid(i *layers.PCFLen, c fuzz.Continue) {
*i = layers.PCFLen(len(shimLayer.PCFValue.Value))
}
// FuzzPCFIntegrityValidRandom fuzzes the integrity value random from 0x00 to 0x03
func FuzzPCFIntegrityValidRandom(i *layers.PCFIntegrity, c fuzz.Continue) {
*i = layers.PCFIntegrity(rand.Intn(4))
}
type varPSNValidThirdRandomNumber struct {
fuzzPSNPacketCounter int
}
// PSNValidThirdRandomNumber holds the variables for the fuzzing function.
var PSNValidThirdRandomNumber varPSNValidThirdRandomNumber
// FuzzPSNValidThirdRandom fuzzes the PSN value so, that every third packet gets a random PSN.
func FuzzPSNValidThirdRandom(i *layers.PSN, c fuzz.Continue) {
if PSNValidThirdRandomNumber.fuzzPSNPacketCounter%3 == 0 {
*i = layers.PSN(rand.Int31n(4200000))
}
PSNValidThirdRandomNumber.fuzzPSNPacketCounter++
}
type varPSNValidThirdEarlierNumber struct {
nextPSN layers.PSN
everyThirdPSN layers.PSN
fuzzPSNPacketCounter int
}
// PSNValidThirdEarlierNumber holds the variables for the fuzzing function.
var PSNValidThirdEarlierNumber varPSNValidThirdEarlierNumber
// FuzzPSNValidThirdEarlierNumber fuzzes the PSN value so, that every third packet gets the same value as an earlier packet.
func FuzzPSNValidThirdEarlierNumber(i *layers.PSN, c fuzz.Continue) {
PSNValidThirdEarlierNumber.nextPSN = shimLayer.PSN.Value
*i = PSNValidThirdEarlierNumber.nextPSN
if PSNValidThirdEarlierNumber.fuzzPSNPacketCounter%3 == 0 {
*i = PSNValidThirdEarlierNumber.everyThirdPSN
PSNValidThirdEarlierNumber.everyThirdPSN = PSNValidThirdEarlierNumber.nextPSN
}
PSNValidThirdEarlierNumber.fuzzPSNPacketCounter++
}
type varPSNInvalidRepeatNumber struct {
nextPSN layers.PSN
repeatPSN layers.PSN
fuzzPSNPacketCounter int
}
// PSNInvalidRepeatNumber holds the variables for the fuzzing function.
var PSNInvalidRepeatNumber varPSNInvalidRepeatNumber
// FuzzPSNInvalidRepeatNumber fuzzes the PSN value so, that every fifth packet gets the same value as the packet before.
func FuzzPSNInvalidRepeatNumber(i *layers.PSN, c fuzz.Continue) {
if PSNInvalidRepeatNumber.fuzzPSNPacketCounter%5 != 0 {
// Let the last value be stored every fifth packet, so we can set it a second time
PSNInvalidRepeatNumber.repeatPSN = shimLayer.PSN.Value
}
PSNInvalidRepeatNumber.nextPSN = PSNInvalidRepeatNumber.repeatPSN
*i = PSNInvalidRepeatNumber.nextPSN
PSNInvalidRepeatNumber.fuzzPSNPacketCounter++
}
type varPSNValidUpcounting struct {
nextPSN layers.PSN
fuzzPSNPacketCounter int
randSource rand.Source
randGen *rand.Rand
}
// PSNValidUpcounting holds the variables for the fuzzing function.
var PSNValidUpcounting varPSNValidUpcounting
// FuzzPSNValidUpcounting starts with a random PSN and increments it by one for every packet.
func FuzzPSNValidUpcounting(i *layers.PSN, c fuzz.Continue) {
if PSNValidUpcounting.fuzzPSNPacketCounter == 0 {
PSNValidUpcounting.randSource = rand.NewSource(time.Now().UnixNano())
PSNValidUpcounting.randGen = rand.New(PSNValidUpcounting.randSource)
PSNValidUpcounting.nextPSN = layers.PSN(PSNValidUpcounting.randGen.Int31n(420000000))
}
// Wrap around at the maximum uint32 value
if PSNValidUpcounting.nextPSN < 0xFFFFFFFF {
PSNValidUpcounting.nextPSN++
} else {
PSNValidUpcounting.nextPSN = 1
}
*i = PSNValidUpcounting.nextPSN
PSNValidUpcounting.fuzzPSNPacketCounter++
}
type varPSNInvalidUpcounting struct {
nextPSN layers.PSN
fuzzPSNPacketCounter int
randSource rand.Source
randGen *rand.Rand
}
// PSNInvalidUpcounting holds the variables for the fuzzing function.
var PSNInvalidUpcounting varPSNInvalidUpcounting
// FuzzPSNInvalidUpcounting starts with a random PSN and increments it by one for every packet.
// It wraps around, but sends a packet with PSN 0, which isn't allowed.
func FuzzPSNInvalidUpcounting(i *layers.PSN, c fuzz.Continue) {
if PSNInvalidUpcounting.fuzzPSNPacketCounter == 0 {
PSNInvalidUpcounting.randSource = rand.NewSource(time.Now().UnixNano())
PSNInvalidUpcounting.randGen = rand.New(PSNInvalidUpcounting.randSource)
PSNInvalidUpcounting.nextPSN = layers.PSN(PSNInvalidUpcounting.randGen.Int31n(420000000))
}
// Wrap around at the maximum value
if PSNInvalidUpcounting.nextPSN < 0xFFFFFFFF {
PSNInvalidUpcounting.nextPSN++
} else {
// By specification a PSN with value 0 isn't allowed.
PSNInvalidUpcounting.nextPSN = 0
}
*i = PSNInvalidUpcounting.nextPSN
PSNInvalidUpcounting.fuzzPSNPacketCounter++
}
type varPSNInvalidZero struct {
nextPSN layers.PSN
fuzzPSNPacketCounter int
randSource rand.Source
randGen *rand.Rand
}
// PSNInvalidZero holds the variables for the fuzzing function.
var PSNInvalidZero varPSNInvalidZero
// FuzzPSNInvalidZero starts with a random PSN and increments it by one for every packet.
// It inserts a zero value for PSN every tenth packet.
func FuzzPSNInvalidZero(i *layers.PSN, c fuzz.Continue) {
if PSNInvalidZero.fuzzPSNPacketCounter == 0 {
PSNInvalidZero.randSource = rand.NewSource(time.Now().UnixNano())
PSNInvalidZero.randGen = rand.New(PSNInvalidZero.randSource)
PSNInvalidZero.nextPSN = layers.PSN(PSNInvalidZero.randGen.Int31n(420000000))
}
// Wrap around at the maximum value
if PSNInvalidZero.nextPSN < 0xFFFFFFFF {
PSNInvalidZero.nextPSN++
} else {
// By specification a PSN with value 0 isn't allowed.
PSNInvalidZero.nextPSN = 1
}
if PSNInvalidZero.fuzzPSNPacketCounter%10 == 0 && PSNInvalidZero.fuzzPSNPacketCounter != 0 {
*i = 0
} else {
*i = PSNInvalidZero.nextPSN
}
PSNInvalidZero.fuzzPSNPacketCounter++
}
type varPSNInvalidDowncounting struct {
nextPSN layers.PSN
fuzzPSNPacketCounter int
randSource rand.Source
randGen *rand.Rand
}
// PSNInvalidDowncounting holds the variables for the fuzzing function.
var PSNInvalidDowncounting varPSNInvalidDowncounting
// FuzzPSNInvalidDowncounting starts with a random PSN and decrements it by one for every packet.
// It wraps around.
func FuzzPSNInvalidDowncounting(i *layers.PSN, c fuzz.Continue) {
if PSNInvalidDowncounting.fuzzPSNPacketCounter == 0 {
PSNInvalidDowncounting.randSource = rand.NewSource(time.Now().UnixNano())
PSNInvalidDowncounting.randGen = rand.New(PSNInvalidDowncounting.randSource)
PSNInvalidDowncounting.nextPSN = layers.PSN(PSNInvalidDowncounting.randGen.Int31n(420000000))
}
// Wrap around at the minimum value
if PSNInvalidDowncounting.nextPSN > 0 {
PSNInvalidDowncounting.nextPSN--
} else {
PSNInvalidDowncounting.nextPSN = 0xFFFFFFFF
}
*i = PSNInvalidDowncounting.nextPSN
PSNInvalidDowncounting.fuzzPSNPacketCounter++
}
type varPSEValidUpcounting struct {
nextPSE layers.PSE
fuzzPSEPacketCounter int
randSource rand.Source
randGen *rand.Rand
}
// PSEValidUpcounting holds the variables for the fuzzing function.
var PSEValidUpcounting varPSEValidUpcounting
// FuzzPSEValidUpcounting starts with a random PSN and increments it by one for every packet.
func FuzzPSEValidUpcounting(i *layers.PSE, c fuzz.Continue) {
switch {
case PSEValidUpcounting.fuzzPSEPacketCounter == 0:
PSEValidUpcounting.randSource = rand.NewSource(time.Now().UnixNano())
PSEValidUpcounting.randGen = rand.New(PSEValidUpcounting.randSource)
PSEValidUpcounting.nextPSE = 0
case PSEValidUpcounting.fuzzPSEPacketCounter == 1:
PSEValidUpcounting.nextPSE = layers.PSE(PSEValidUpcounting.randGen.Int31n(420000000))
default:
// Wrap around at the maximum uint32 value
if PSEValidUpcounting.nextPSE < 0xFFFFFFFF {
PSEValidUpcounting.nextPSE++
} else {
PSEValidUpcounting.nextPSE = 1
}
}
*i = PSEValidUpcounting.nextPSE
PSEValidUpcounting.fuzzPSEPacketCounter++
}
type varPSEInvalidZero struct {
nextPSE layers.PSE
fuzzPSEPacketCounter int
randSource rand.Source
randGen *rand.Rand
}
// PSEInvalidZero holds the variables for the fuzzing function.
var PSEInvalidZero varPSEInvalidZero
// FuzzPSEInvalidZero starts with a PSE of 0 and increments it by one for every packet.
// It wraps around. It sets the PSE to 0 every tenth packet.
func FuzzPSEInvalidZero(i *layers.PSE, c fuzz.Continue) {
if PSEInvalidZero.fuzzPSEPacketCounter == 0 {
PSEInvalidZero.randSource = rand.NewSource(time.Now().UnixNano())
PSEInvalidZero.randGen = rand.New(PSEInvalidZero.randSource)
PSEInvalidZero.nextPSE = layers.PSE(PSEInvalidZero.randGen.Int31n(420000000))
}
// Wrap around at the maximum value
if PSEInvalidZero.nextPSE < 0xFFFFFFFF {
PSEInvalidZero.nextPSE++
} else {
PSEInvalidZero.nextPSE = 0xFFFFFFFF
}
if PSEInvalidZero.fuzzPSEPacketCounter%10 == 0 && PSEInvalidZero.fuzzPSEPacketCounter != 0 {
*i = 0
} else {
*i = PSEInvalidZero.nextPSE
}
PSEInvalidZero.fuzzPSEPacketCounter++
}
type varPCFValueInvalid struct {
nextPCFValue layers.PSE
fuzzPCFValuePacketCounter int
randSource rand.Source
randGen *rand.Rand
}
// PCFValueInvalid holds the variables for the fuzzing function.
var PCFValueInvalid varPCFValueInvalid
// FuzzPCFValueInvalid sets a random PCFValue and inserts an empty PCFValue every tenth packet.
func FuzzPCFValueInvalid(i *layers.PCFValue, c fuzz.Continue) {
randByte := make([]byte, c.Int31n(64))
c.Read(randByte)
*i = randByte
if PCFValueInvalid.fuzzPCFValuePacketCounter%10 == 0 {
shimLayer.XFlag.Value = true
*i = []byte{}
}
PCFValueInvalid.fuzzPCFValuePacketCounter++
}
type varPayloadRandomManual struct {
nextPayload layers.Payload
fuzzPayloadPacketCounter int
}
// PayloadRandomManual holds the variables for the fuzzing function.
var PayloadRandomManual varPayloadRandomManual
// FuzzPayloadRandomManual sets a random Payload between -max-payload-len and -min-payload-len.
// Every 25th packet is set with another fix value, which you can add in this function.
func FuzzPayloadRandomManual(i *layers.Payload, c fuzz.Continue) {
randByte := make([]byte, c.Intn(*maxPayloadLen-*minPayloadLen)+*minPayloadLen)
c.Read(randByte)
*i = randByte
if PayloadRandomManual.fuzzPayloadPacketCounter != 0 && PayloadRandomManual.fuzzPayloadPacketCounter%25 == 0 {
switch c.Intn(3) {
case 0:
shimLayer.XFlag.Value = false
*i = []byte{0xcc, 0xa2, 0x85, 0x46, 0xbd, 0x3a, 0x89}
case 1:
shimLayer.XFlag.Value = false
*i = []byte{0xbd, 0x3a, 0x89}
case 2:
shimLayer.XFlag.Value = false
*i = []byte{}
}
}
PayloadRandomManual.fuzzPayloadPacketCounter++
}
type varPayloadRandomSpecificFirstByte struct {
nextPayload layers.Payload
fuzzPayloadPacketCounter int
}
// PayloadRandomSpecificFirstByte holds the variables for the fuzzing function.
var PayloadRandomSpecificFirstByte varPayloadRandomSpecificFirstByte
// FuzzPayloadRandomSpecificFirstByte sets a random Payload between -max-payload-len and -min-payload-len.
// Every 5th packet is set randomly with one of the interesting start bytes from the overlaying protocol.
func FuzzPayloadRandomSpecificFirstByte(i *layers.Payload, c fuzz.Continue) {
randByte := make([]byte, c.Intn(*maxPayloadLen-*minPayloadLen)+*minPayloadLen)
c.Read(randByte)
*i = randByte
if PayloadRandomSpecificFirstByte.fuzzPayloadPacketCounter != 0 && PayloadRandomSpecificFirstByte.fuzzPayloadPacketCounter%5 == 0 {
if len(*i) != 0 {
switch c.Intn(7) {
case 0:
(*i)[0] = 0xCC
case 1:
(*i)[0] = 0xAA
case 2:
(*i)[0] = 0xBB
case 3:
(*i)[0] = 0xFF
case 4:
(*i)[0] = 0x88
case 5:
(*i)[0] = 0x77
case 6:
(*i)[0] = 0x00
}
}
}
PayloadRandomSpecificFirstByte.fuzzPayloadPacketCounter++
}
type varPayloadRandomSpecificEncrypted struct {
nextPayload layers.Payload
fuzzPayloadPacketCounter int
cryptoKey []byte
cryptoSecret []byte
}
// PayloadRandomSpecificEncrypted holds the variables for the fuzzing function.
var PayloadRandomSpecificEncrypted = varPayloadRandomSpecificEncrypted{
cryptoKey: []byte{0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF},
cryptoSecret: []byte{0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF},
}
// FuzzvarPayloadRandomSpecificEncrypted sets a random Payload between -max-payload-len and -min-payload-len.
// Afterwards the payload gets encrypted and protected
func FuzzvarPayloadRandomSpecificEncrypted(i *layers.Payload, c fuzz.Continue) {
// Generate random bytes
randByte := make([]byte, c.Intn(*maxPayloadLen-*minPayloadLen)+*minPayloadLen)
c.Read(randByte)
*i = randByte
// Set the first byte to a "It's a Packet" byte for the plus-debug protocol
(*i)[0] = 0x00
if *verbose {
Info.Printf("Rand bytes before encryption: %x\n", *i)
}
// Get the Shim Header
shimlayerHeader := SerializePLUSHeader()
if *verbose {
Info.Printf("ShimLayer header from Serialize function: %x\n", shimlayerHeader)
}
// Took the implementation for encryption and protection from plus-debug from Roman Muentener, ZHAW
buf := make([]byte, (17 + len(shimlayerHeader) + len(*i))) // reserve 16 bytes for checksum + 1 byte for header len
if *verbose {
Info.Printf("buf: %x\n", buf)
}
bufStart := buf[17:]
if *verbose {
Info.Printf("bufStart: %x\n", bufStart)
}
buf[16] = byte(len(shimlayerHeader)) // 0-15 is for checksum/secret afterwards, 16 for header len
_ = copy(bufStart, shimlayerHeader)
if *verbose {
Info.Printf("bufStart after Header Copy: %x\n", bufStart)
}
_ = copy(bufStart[len(shimlayerHeader):], *i)
if *verbose {
Info.Printf("bufStart after data copy: %x\n", bufStart)
}
_ = copy(buf, PayloadRandomSpecificEncrypted.cryptoSecret)
if *verbose {
Info.Printf("buf after secret copy: %x\n", buf)
}
// Encrypt the data with the function from Roman Muentener of the plus-debug protocol
data := buf[16:]
if *verbose {
Info.Printf("data before encryption: %x\n", data)
}
keyLen := len(PayloadRandomSpecificEncrypted.cryptoKey)
dataLen := len(data)
for j := 0; j < dataLen; j++ {
data[j] ^= PayloadRandomSpecificEncrypted.cryptoKey[j%keyLen]
}
// End of encryption
if *verbose {
Info.Printf("data after encryption: %x\n", data)
Info.Printf("buf after encryption: %x\n", buf)
}
hash := md5.Sum(buf)
if *verbose {
Info.Printf("hash of buf: %x\n", hash)
}
if len(hash) != 16 {
panic("Hash has bogus length! BUG. REPORT THIS!")
}
_ = copy(buf, hash[0:])
// initialize i with new length
*i = make([]byte, len(buf))
_ = copy(*i, buf)
if *verbose {
Info.Printf("Payload to send (buf): %x\n", buf)
Info.Printf("Payload to send (i): %x\n", *i)
}
// To check implementation of encryption and protection, the following code is the opposite from above.
if *verbose {
// Save the hash for comparison
packetHash := make([]byte, 16)
_ = copy(packetHash, buf[0:16])
// Set the secret
_ = copy(buf, PayloadRandomSpecificEncrypted.cryptoSecret)
// Compute the hash
checkHash := md5.Sum(buf)
calculatedHash := checkHash[0:]
Info.Printf("hash of check: %x\n", calculatedHash)
// If hashes are not equal something is fishy
if !bytes.Equal(packetHash, calculatedHash) {
Info.Println("Hash not correct.")
}
// Decrypt the packet
data = buf[16:]
dataLen = len(data)
for j := 0; j < dataLen; j++ {
data[j] ^= PayloadRandomSpecificEncrypted.cryptoKey[j%keyLen]
}
headerLen := buf[16]
// Extract the header
header := buf[17 : 17+headerLen]
Info.Printf("ShimLayer header from Serialize funtion: %x\n", shimlayerHeader)
Info.Printf("Decrypted header from packet: %x\n", header)
// Compare it with the header we got
if !bytes.Equal(shimlayerHeader, header) {
Info.Println("Headers doesn't match.")
}
buf = buf[17+headerLen:]
}
PayloadRandomSpecificEncrypted.fuzzPayloadPacketCounter++
}
// SerializePLUSHeader serializes the PLUS header into a byte stream from the header values.
// It is the same function as in the layers package for the ShimLayerType
func SerializePLUSHeader() []byte {
var bytes []byte
var lengthAndIntegrity int8
l := shimLayer
if l.XFlag.Value {
//Extended Header
bytes = make([]byte, 22+len(l.PCFValue.Value))
// Generate length and integrity field, because they are 1 byte together.
lengthAndIntegrity = int8(l.PCFLen.Value)<<2 | int8(l.PCFIntegrity.Value)
} else {
// Basic Header
bytes = make([]byte, 20)
}
// Generate magic and flags in one uint32 value, because magic and flags share 4 bytes. We get the magic and shift it 4 bits to add the flags by shifting them
// in the correct order.
magicAndFlags := ((((uint32(l.Magic.Value) << 4) | (boolToInt(bool(l.LFlag.Value)) << 3)) | (boolToInt(bool(l.RFlag.Value)) << 2)) | (boolToInt(bool(l.SFlag.Value)) << 1)) | boolToInt(bool(l.XFlag.Value))
// fmt.Println("Magic: ", p.Magic<<4)
// fmt.Println("LFlag: ", boolToInt(p.LFlag)<<3)
// fmt.Println("RFlag: ", boolToInt(p.RFlag)<<2)
// fmt.Println("SFlag: ", boolToInt(p.SFlag)<<1)
// fmt.Println("XFlag: ", boolToInt(p.XFlag))
// fmt.Println(magicAndFlags)
binary.BigEndian.PutUint32(bytes, uint32(magicAndFlags))
binary.BigEndian.PutUint64(bytes[4:], uint64(l.CAT.Value))
binary.BigEndian.PutUint32(bytes[12:], uint32(l.PSN.Value))
binary.BigEndian.PutUint32(bytes[16:], uint32(l.PSE.Value))
// Write fields of extended Header only if XFlag is set.
if l.XFlag.Value {
bytes[20] = uint8(l.PCFType.Value)
bytes[21] = uint8(lengthAndIntegrity)
copy(bytes[22:], l.PCFValue.Value)
}
return bytes
}
// boolToInt is a utility function for converting bool -> 0/1
// during serialization/decoding
func boolToInt(b bool) uint32 {
if b {
return 1
}
return 0
}
// fuzzFuncs defines slice for fuzzing functions and add them to slice, which is used from the fuzzer.
// You have to add your custom fuzzing functions here manually to fuzzFuncs.
var fuzzFuncs = []interface{}{FuzzPCFLenValid, FuzzPCFIntegrityValidRandom, FuzzPSNInvalidZero, FuzzPSEValidUpcounting}