You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
258 lines
5.9 KiB
258 lines
5.9 KiB
package conn
|
|
|
|
import (
|
|
"bytes"
|
|
"errors"
|
|
"io"
|
|
"testing"
|
|
|
|
"github.com/gtank/merlin"
|
|
"github.com/stretchr/testify/assert"
|
|
"golang.org/x/crypto/chacha20poly1305"
|
|
|
|
"github.com/tendermint/tendermint/crypto"
|
|
"github.com/tendermint/tendermint/crypto/ed25519"
|
|
)
|
|
|
|
type buffer struct {
|
|
next bytes.Buffer
|
|
}
|
|
|
|
func (b *buffer) Read(data []byte) (n int, err error) {
|
|
return b.next.Read(data)
|
|
}
|
|
|
|
func (b *buffer) Write(data []byte) (n int, err error) {
|
|
return b.next.Write(data)
|
|
}
|
|
|
|
func (b *buffer) Bytes() []byte {
|
|
return b.next.Bytes()
|
|
}
|
|
|
|
func (b *buffer) Close() error {
|
|
return nil
|
|
}
|
|
|
|
type evilConn struct {
|
|
secretConn *SecretConnection
|
|
buffer *buffer
|
|
|
|
locEphPub *[32]byte
|
|
locEphPriv *[32]byte
|
|
remEphPub *[32]byte
|
|
privKey crypto.PrivKey
|
|
|
|
readStep int
|
|
writeStep int
|
|
readOffset int
|
|
|
|
shareEphKey bool
|
|
badEphKey bool
|
|
shareAuthSignature bool
|
|
badAuthSignature bool
|
|
}
|
|
|
|
func newEvilConn(shareEphKey, badEphKey, shareAuthSignature, badAuthSignature bool) *evilConn {
|
|
privKey := ed25519.GenPrivKey()
|
|
locEphPub, locEphPriv := genEphKeys()
|
|
var rep [32]byte
|
|
c := &evilConn{
|
|
locEphPub: locEphPub,
|
|
locEphPriv: locEphPriv,
|
|
remEphPub: &rep,
|
|
privKey: privKey,
|
|
|
|
shareEphKey: shareEphKey,
|
|
badEphKey: badEphKey,
|
|
shareAuthSignature: shareAuthSignature,
|
|
badAuthSignature: badAuthSignature,
|
|
}
|
|
|
|
return c
|
|
}
|
|
|
|
func (c *evilConn) Read(data []byte) (n int, err error) {
|
|
if !c.shareEphKey {
|
|
return 0, io.EOF
|
|
}
|
|
|
|
switch c.readStep {
|
|
case 0:
|
|
if !c.badEphKey {
|
|
bz, err := cdc.MarshalBinaryLengthPrefixed(c.locEphPub)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
copy(data, bz[c.readOffset:])
|
|
n = len(data)
|
|
} else {
|
|
bz, err := cdc.MarshalBinaryLengthPrefixed([]byte("drop users;"))
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
copy(data, bz)
|
|
n = len(data)
|
|
}
|
|
c.readOffset += n
|
|
|
|
if n >= 32 {
|
|
c.readOffset = 0
|
|
c.readStep = 1
|
|
if !c.shareAuthSignature {
|
|
c.readStep = 2
|
|
}
|
|
}
|
|
|
|
return n, nil
|
|
case 1:
|
|
signature := c.signChallenge()
|
|
if !c.badAuthSignature {
|
|
bz, err := cdc.MarshalBinaryLengthPrefixed(authSigMessage{c.privKey.PubKey(), signature})
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
n, err = c.secretConn.Write(bz)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
if c.readOffset > len(c.buffer.Bytes()) {
|
|
return len(data), nil
|
|
}
|
|
copy(data, c.buffer.Bytes()[c.readOffset:])
|
|
} else {
|
|
bz, err := cdc.MarshalBinaryLengthPrefixed([]byte("select * from users;"))
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
n, err = c.secretConn.Write(bz)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
if c.readOffset > len(c.buffer.Bytes()) {
|
|
return len(data), nil
|
|
}
|
|
copy(data, c.buffer.Bytes())
|
|
}
|
|
c.readOffset += len(data)
|
|
return n, nil
|
|
default:
|
|
return 0, io.EOF
|
|
}
|
|
}
|
|
|
|
func (c *evilConn) Write(data []byte) (n int, err error) {
|
|
switch c.writeStep {
|
|
case 0:
|
|
err := cdc.UnmarshalBinaryLengthPrefixed(data, c.remEphPub)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
c.writeStep = 1
|
|
if !c.shareAuthSignature {
|
|
c.writeStep = 2
|
|
}
|
|
return len(data), nil
|
|
case 1:
|
|
// Signature is not needed, therefore skipped.
|
|
return len(data), nil
|
|
default:
|
|
return 0, io.EOF
|
|
}
|
|
}
|
|
|
|
func (c *evilConn) Close() error {
|
|
return nil
|
|
}
|
|
|
|
func (c *evilConn) signChallenge() []byte {
|
|
// Sort by lexical order.
|
|
loEphPub, hiEphPub := sort32(c.locEphPub, c.remEphPub)
|
|
|
|
transcript := merlin.NewTranscript("TENDERMINT_SECRET_CONNECTION_TRANSCRIPT_HASH")
|
|
|
|
transcript.AppendMessage(labelEphemeralLowerPublicKey, loEphPub[:])
|
|
transcript.AppendMessage(labelEphemeralUpperPublicKey, hiEphPub[:])
|
|
|
|
// Check if the local ephemeral public key was the least, lexicographically
|
|
// sorted.
|
|
locIsLeast := bytes.Equal(c.locEphPub[:], loEphPub[:])
|
|
|
|
// Compute common diffie hellman secret using X25519.
|
|
dhSecret, err := computeDHSecret(c.remEphPub, c.locEphPriv)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
transcript.AppendMessage(labelDHSecret, dhSecret[:])
|
|
|
|
// Generate the secret used for receiving, sending, challenge via HKDF-SHA2
|
|
// on the transcript state (which itself also uses HKDF-SHA2 to derive a key
|
|
// from the dhSecret).
|
|
recvSecret, sendSecret := deriveSecrets(dhSecret, locIsLeast)
|
|
|
|
const challengeSize = 32
|
|
var challenge [challengeSize]byte
|
|
challengeSlice := transcript.ExtractBytes(labelSecretConnectionMac, challengeSize)
|
|
|
|
copy(challenge[:], challengeSlice[0:challengeSize])
|
|
|
|
sendAead, err := chacha20poly1305.New(sendSecret[:])
|
|
if err != nil {
|
|
panic(errors.New("invalid send SecretConnection Key"))
|
|
}
|
|
recvAead, err := chacha20poly1305.New(recvSecret[:])
|
|
if err != nil {
|
|
panic(errors.New("invalid receive SecretConnection Key"))
|
|
}
|
|
|
|
b := &buffer{}
|
|
c.secretConn = &SecretConnection{
|
|
conn: b,
|
|
recvBuffer: nil,
|
|
recvNonce: new([aeadNonceSize]byte),
|
|
sendNonce: new([aeadNonceSize]byte),
|
|
recvAead: recvAead,
|
|
sendAead: sendAead,
|
|
}
|
|
c.buffer = b
|
|
|
|
// Sign the challenge bytes for authentication.
|
|
locSignature, err := signChallenge(&challenge, c.privKey)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
return locSignature
|
|
}
|
|
|
|
// TestMakeSecretConnection creates an evil connection and tests that
|
|
// MakeSecretConnection errors at different stages.
|
|
func TestMakeSecretConnection(t *testing.T) {
|
|
testCases := []struct {
|
|
name string
|
|
conn *evilConn
|
|
errMsg string
|
|
}{
|
|
{"refuse to share ethimeral key", newEvilConn(false, false, false, false), "EOF"},
|
|
{"share bad ethimeral key", newEvilConn(true, true, false, false), "Insufficient bytes to decode"},
|
|
{"refuse to share auth signature", newEvilConn(true, false, false, false), "EOF"},
|
|
{"share bad auth signature", newEvilConn(true, false, true, true), "failed to decrypt SecretConnection"},
|
|
{"all good", newEvilConn(true, false, true, false), ""},
|
|
}
|
|
|
|
for _, tc := range testCases {
|
|
tc := tc
|
|
t.Run(tc.name, func(t *testing.T) {
|
|
privKey := ed25519.GenPrivKey()
|
|
_, err := MakeSecretConnection(tc.conn, privKey)
|
|
if tc.errMsg != "" {
|
|
if assert.Error(t, err) {
|
|
assert.Contains(t, err.Error(), tc.errMsg)
|
|
}
|
|
} else {
|
|
assert.NoError(t, err)
|
|
}
|
|
})
|
|
}
|
|
}
|