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273 lines
6.4 KiB
273 lines
6.4 KiB
package conn
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import (
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"bytes"
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"errors"
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"io"
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"testing"
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gogotypes "github.com/gogo/protobuf/types"
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"github.com/gtank/merlin"
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"github.com/stretchr/testify/assert"
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"golang.org/x/crypto/chacha20poly1305"
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"github.com/tendermint/tendermint/crypto"
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"github.com/tendermint/tendermint/crypto/ed25519"
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cryptoenc "github.com/tendermint/tendermint/crypto/encoding"
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"github.com/tendermint/tendermint/libs/protoio"
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tmp2p "github.com/tendermint/tendermint/proto/tendermint/p2p"
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)
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type buffer struct {
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next bytes.Buffer
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}
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func (b *buffer) Read(data []byte) (n int, err error) {
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return b.next.Read(data)
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}
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func (b *buffer) Write(data []byte) (n int, err error) {
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return b.next.Write(data)
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}
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func (b *buffer) Bytes() []byte {
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return b.next.Bytes()
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}
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func (b *buffer) Close() error {
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return nil
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}
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type evilConn struct {
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secretConn *SecretConnection
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buffer *buffer
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locEphPub *[32]byte
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locEphPriv *[32]byte
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remEphPub *[32]byte
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privKey crypto.PrivKey
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readStep int
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writeStep int
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readOffset int
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shareEphKey bool
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badEphKey bool
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shareAuthSignature bool
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badAuthSignature bool
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}
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func newEvilConn(shareEphKey, badEphKey, shareAuthSignature, badAuthSignature bool) *evilConn {
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privKey := ed25519.GenPrivKey()
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locEphPub, locEphPriv := genEphKeys()
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var rep [32]byte
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c := &evilConn{
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locEphPub: locEphPub,
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locEphPriv: locEphPriv,
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remEphPub: &rep,
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privKey: privKey,
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shareEphKey: shareEphKey,
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badEphKey: badEphKey,
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shareAuthSignature: shareAuthSignature,
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badAuthSignature: badAuthSignature,
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}
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return c
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}
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func (c *evilConn) Read(data []byte) (n int, err error) {
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if !c.shareEphKey {
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return 0, io.EOF
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}
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switch c.readStep {
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case 0:
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if !c.badEphKey {
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lc := *c.locEphPub
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bz, err := protoio.MarshalDelimited(&gogotypes.BytesValue{Value: lc[:]})
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if err != nil {
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panic(err)
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}
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copy(data, bz[c.readOffset:])
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n = len(data)
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} else {
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bz, err := protoio.MarshalDelimited(&gogotypes.BytesValue{Value: []byte("drop users;")})
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if err != nil {
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panic(err)
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}
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copy(data, bz)
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n = len(data)
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}
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c.readOffset += n
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if n >= 32 {
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c.readOffset = 0
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c.readStep = 1
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if !c.shareAuthSignature {
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c.readStep = 2
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}
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}
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return n, nil
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case 1:
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signature := c.signChallenge()
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if !c.badAuthSignature {
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pkpb, err := cryptoenc.PubKeyToProto(c.privKey.PubKey())
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if err != nil {
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panic(err)
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}
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bz, err := protoio.MarshalDelimited(&tmp2p.AuthSigMessage{PubKey: pkpb, Sig: signature})
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if err != nil {
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panic(err)
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}
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n, err = c.secretConn.Write(bz)
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if err != nil {
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panic(err)
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}
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if c.readOffset > len(c.buffer.Bytes()) {
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return len(data), nil
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}
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copy(data, c.buffer.Bytes()[c.readOffset:])
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} else {
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bz, err := protoio.MarshalDelimited(&gogotypes.BytesValue{Value: []byte("select * from users;")})
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if err != nil {
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panic(err)
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}
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n, err = c.secretConn.Write(bz)
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if err != nil {
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panic(err)
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}
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if c.readOffset > len(c.buffer.Bytes()) {
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return len(data), nil
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}
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copy(data, c.buffer.Bytes())
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}
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c.readOffset += len(data)
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return n, nil
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default:
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return 0, io.EOF
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}
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}
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func (c *evilConn) Write(data []byte) (n int, err error) {
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switch c.writeStep {
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case 0:
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var (
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bytes gogotypes.BytesValue
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remEphPub [32]byte
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)
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err := protoio.UnmarshalDelimited(data, &bytes)
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if err != nil {
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panic(err)
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}
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copy(remEphPub[:], bytes.Value)
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c.remEphPub = &remEphPub
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c.writeStep = 1
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if !c.shareAuthSignature {
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c.writeStep = 2
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}
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return len(data), nil
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case 1:
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// Signature is not needed, therefore skipped.
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return len(data), nil
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default:
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return 0, io.EOF
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}
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}
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func (c *evilConn) Close() error {
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return nil
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}
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func (c *evilConn) signChallenge() []byte {
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// Sort by lexical order.
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loEphPub, hiEphPub := sort32(c.locEphPub, c.remEphPub)
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transcript := merlin.NewTranscript("TENDERMINT_SECRET_CONNECTION_TRANSCRIPT_HASH")
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transcript.AppendMessage(labelEphemeralLowerPublicKey, loEphPub[:])
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transcript.AppendMessage(labelEphemeralUpperPublicKey, hiEphPub[:])
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// Check if the local ephemeral public key was the least, lexicographically
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// sorted.
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locIsLeast := bytes.Equal(c.locEphPub[:], loEphPub[:])
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// Compute common diffie hellman secret using X25519.
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dhSecret, err := computeDHSecret(c.remEphPub, c.locEphPriv)
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if err != nil {
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panic(err)
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}
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transcript.AppendMessage(labelDHSecret, dhSecret[:])
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// Generate the secret used for receiving, sending, challenge via HKDF-SHA2
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// on the transcript state (which itself also uses HKDF-SHA2 to derive a key
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// from the dhSecret).
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recvSecret, sendSecret := deriveSecrets(dhSecret, locIsLeast)
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const challengeSize = 32
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var challenge [challengeSize]byte
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challengeSlice := transcript.ExtractBytes(labelSecretConnectionMac, challengeSize)
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copy(challenge[:], challengeSlice[0:challengeSize])
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sendAead, err := chacha20poly1305.New(sendSecret[:])
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if err != nil {
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panic(errors.New("invalid send SecretConnection Key"))
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}
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recvAead, err := chacha20poly1305.New(recvSecret[:])
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if err != nil {
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panic(errors.New("invalid receive SecretConnection Key"))
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}
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b := &buffer{}
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c.secretConn = &SecretConnection{
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conn: b,
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recvBuffer: nil,
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recvNonce: new([aeadNonceSize]byte),
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sendNonce: new([aeadNonceSize]byte),
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recvAead: recvAead,
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sendAead: sendAead,
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}
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c.buffer = b
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// Sign the challenge bytes for authentication.
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locSignature, err := signChallenge(&challenge, c.privKey)
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if err != nil {
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panic(err)
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}
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return locSignature
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}
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// TestMakeSecretConnection creates an evil connection and tests that
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// MakeSecretConnection errors at different stages.
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func TestMakeSecretConnection(t *testing.T) {
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testCases := []struct {
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name string
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conn *evilConn
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errMsg string
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}{
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{"refuse to share ethimeral key", newEvilConn(false, false, false, false), "EOF"},
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{"share bad ethimeral key", newEvilConn(true, true, false, false), "wrong wireType"},
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{"refuse to share auth signature", newEvilConn(true, false, false, false), "EOF"},
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{"share bad auth signature", newEvilConn(true, false, true, true), "failed to decrypt SecretConnection"},
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{"all good", newEvilConn(true, false, true, false), ""},
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}
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for _, tc := range testCases {
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tc := tc
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t.Run(tc.name, func(t *testing.T) {
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privKey := ed25519.GenPrivKey()
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_, err := MakeSecretConnection(tc.conn, privKey)
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if tc.errMsg != "" {
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if assert.Error(t, err) {
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assert.Contains(t, err.Error(), tc.errMsg)
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}
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} else {
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assert.NoError(t, err)
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}
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})
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}
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}
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