717 lines
20 KiB
Go
717 lines
20 KiB
Go
package brontide
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import (
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"bytes"
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"encoding/hex"
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"fmt"
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"io"
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"math"
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"net"
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"testing"
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"testing/iotest"
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"github.com/btcsuite/btcd/btcec"
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"github.com/lightningnetwork/lnd/lnwire"
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)
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type maybeNetConn struct {
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conn net.Conn
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err error
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}
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func makeListener() (*Listener, *lnwire.NetAddress, error) {
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// First, generate the long-term private keys for the brontide listener.
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localPriv, err := btcec.NewPrivateKey(btcec.S256())
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if err != nil {
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return nil, nil, err
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}
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// Having a port of ":0" means a random port, and interface will be
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// chosen for our listener.
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addr := "localhost:0"
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// Our listener will be local, and the connection remote.
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listener, err := NewListener(localPriv, addr)
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if err != nil {
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return nil, nil, err
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}
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netAddr := &lnwire.NetAddress{
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IdentityKey: localPriv.PubKey(),
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Address: listener.Addr().(*net.TCPAddr),
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}
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return listener, netAddr, nil
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}
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func establishTestConnection() (net.Conn, net.Conn, func(), error) {
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listener, netAddr, err := makeListener()
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if err != nil {
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return nil, nil, nil, err
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}
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defer listener.Close()
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// Nos, generate the long-term private keys remote end of the connection
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// within our test.
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remotePriv, err := btcec.NewPrivateKey(btcec.S256())
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if err != nil {
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return nil, nil, nil, err
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}
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// Initiate a connection with a separate goroutine, and listen with our
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// main one. If both errors are nil, then encryption+auth was
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// successful.
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remoteConnChan := make(chan maybeNetConn, 1)
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go func() {
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remoteConn, err := Dial(remotePriv, netAddr, net.Dial)
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remoteConnChan <- maybeNetConn{remoteConn, err}
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}()
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localConnChan := make(chan maybeNetConn, 1)
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go func() {
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localConn, err := listener.Accept()
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localConnChan <- maybeNetConn{localConn, err}
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}()
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remote := <-remoteConnChan
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if remote.err != nil {
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return nil, nil, nil, err
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}
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local := <-localConnChan
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if local.err != nil {
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return nil, nil, nil, err
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}
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cleanUp := func() {
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local.conn.Close()
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remote.conn.Close()
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}
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return local.conn, remote.conn, cleanUp, nil
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}
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func TestConnectionCorrectness(t *testing.T) {
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// Create a test connection, grabbing either side of the connection
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// into local variables. If the initial crypto handshake fails, then
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// we'll get a non-nil error here.
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localConn, remoteConn, cleanUp, err := establishTestConnection()
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if err != nil {
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t.Fatalf("unable to establish test connection: %v", err)
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}
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defer cleanUp()
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// Test out some message full-message reads.
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for i := 0; i < 10; i++ {
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msg := []byte("hello" + string(i))
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if _, err := localConn.Write(msg); err != nil {
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t.Fatalf("remote conn failed to write: %v", err)
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}
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readBuf := make([]byte, len(msg))
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if _, err := remoteConn.Read(readBuf); err != nil {
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t.Fatalf("local conn failed to read: %v", err)
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}
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if !bytes.Equal(readBuf, msg) {
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t.Fatalf("messages don't match, %v vs %v",
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string(readBuf), string(msg))
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}
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}
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// Now try incremental message reads. This simulates first writing a
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// message header, then a message body.
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outMsg := []byte("hello world")
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if _, err := localConn.Write(outMsg); err != nil {
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t.Fatalf("remote conn failed to write: %v", err)
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}
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readBuf := make([]byte, len(outMsg))
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if _, err := remoteConn.Read(readBuf[:len(outMsg)/2]); err != nil {
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t.Fatalf("local conn failed to read: %v", err)
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}
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if _, err := remoteConn.Read(readBuf[len(outMsg)/2:]); err != nil {
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t.Fatalf("local conn failed to read: %v", err)
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}
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if !bytes.Equal(outMsg, readBuf) {
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t.Fatalf("messages don't match, %v vs %v",
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string(readBuf), string(outMsg))
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}
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}
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// TestConecurrentHandshakes verifies the listener's ability to not be blocked
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// by other pending handshakes. This is tested by opening multiple tcp
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// connections with the listener, without completing any of the brontide acts.
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// The test passes if real brontide dialer connects while the others are
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// stalled.
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func TestConcurrentHandshakes(t *testing.T) {
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listener, netAddr, err := makeListener()
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if err != nil {
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t.Fatalf("unable to create listener connection: %v", err)
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}
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defer listener.Close()
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const nblocking = 5
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// Open a handful of tcp connections, that do not complete any steps of
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// the brontide handshake.
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connChan := make(chan maybeNetConn)
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for i := 0; i < nblocking; i++ {
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go func() {
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conn, err := net.Dial("tcp", listener.Addr().String())
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connChan <- maybeNetConn{conn, err}
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}()
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}
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// Receive all connections/errors from our blocking tcp dials. We make a
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// pass to gather all connections and errors to make sure we defer the
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// calls to Close() on all successful connections.
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tcpErrs := make([]error, 0, nblocking)
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for i := 0; i < nblocking; i++ {
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result := <-connChan
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if result.conn != nil {
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defer result.conn.Close()
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}
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if result.err != nil {
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tcpErrs = append(tcpErrs, result.err)
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}
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}
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for _, tcpErr := range tcpErrs {
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if tcpErr != nil {
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t.Fatalf("unable to tcp dial listener: %v", tcpErr)
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}
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}
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// Now, construct a new private key and use the brontide dialer to
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// connect to the listener.
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remotePriv, err := btcec.NewPrivateKey(btcec.S256())
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if err != nil {
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t.Fatalf("unable to generate private key: %v", err)
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}
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go func() {
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remoteConn, err := Dial(remotePriv, netAddr, net.Dial)
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connChan <- maybeNetConn{remoteConn, err}
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}()
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// This connection should be accepted without error, as the brontide
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// connection should bypass stalled tcp connections.
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conn, err := listener.Accept()
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if err != nil {
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t.Fatalf("unable to accept dial: %v", err)
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}
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defer conn.Close()
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result := <-connChan
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if result.err != nil {
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t.Fatalf("unable to dial %v: %v", netAddr, result.err)
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}
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result.conn.Close()
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}
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func TestMaxPayloadLength(t *testing.T) {
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t.Parallel()
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b := Machine{}
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b.split()
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// Create a payload that's only *slightly* above the maximum allotted
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// payload length.
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payloadToReject := make([]byte, math.MaxUint16+1)
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// A write of the payload generated above to the state machine should
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// be rejected as it's over the max payload length.
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err := b.WriteMessage(payloadToReject)
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if err != ErrMaxMessageLengthExceeded {
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t.Fatalf("payload is over the max allowed length, the write " +
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"should have been rejected")
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}
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// Generate another payload which should be accepted as a valid
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// payload.
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payloadToAccept := make([]byte, math.MaxUint16-1)
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if err := b.WriteMessage(payloadToAccept); err != nil {
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t.Fatalf("write for payload was rejected, should have been " +
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"accepted")
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}
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// Generate a final payload which is only *slightly* above the max payload length
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// when the MAC is accounted for.
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payloadToReject = make([]byte, math.MaxUint16+1)
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// This payload should be rejected.
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err = b.WriteMessage(payloadToReject)
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if err != ErrMaxMessageLengthExceeded {
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t.Fatalf("payload is over the max allowed length, the write " +
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"should have been rejected")
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}
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}
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func TestWriteMessageChunking(t *testing.T) {
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// Create a test connection, grabbing either side of the connection
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// into local variables. If the initial crypto handshake fails, then
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// we'll get a non-nil error here.
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localConn, remoteConn, cleanUp, err := establishTestConnection()
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if err != nil {
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t.Fatalf("unable to establish test connection: %v", err)
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}
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defer cleanUp()
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// Attempt to write a message which is over 3x the max allowed payload
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// size.
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largeMessage := bytes.Repeat([]byte("kek"), math.MaxUint16*3)
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// Launch a new goroutine to write the large message generated above in
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// chunks. We spawn a new goroutine because otherwise, we may block as
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// the kernel waits for the buffer to flush.
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errCh := make(chan error)
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go func() {
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defer close(errCh)
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bytesWritten, err := localConn.Write(largeMessage)
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if err != nil {
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errCh <- fmt.Errorf("unable to write message: %v", err)
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return
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}
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// The entire message should have been written out to the remote
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// connection.
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if bytesWritten != len(largeMessage) {
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errCh <- fmt.Errorf("bytes not fully written")
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return
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}
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}()
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// Attempt to read the entirety of the message generated above.
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buf := make([]byte, len(largeMessage))
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if _, err := io.ReadFull(remoteConn, buf); err != nil {
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t.Fatalf("unable to read message: %v", err)
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}
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err = <-errCh
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if err != nil {
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t.Fatal(err)
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}
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// Finally, the message the remote end of the connection received
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// should be identical to what we sent from the local connection.
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if !bytes.Equal(buf, largeMessage) {
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t.Fatalf("bytes don't match")
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}
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}
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// TestBolt0008TestVectors ensures that our implementation of brontide exactly
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// matches the test vectors within the specification.
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func TestBolt0008TestVectors(t *testing.T) {
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t.Parallel()
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// First, we'll generate the state of the initiator from the test
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// vectors at the appendix of BOLT-0008
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initiatorKeyBytes, err := hex.DecodeString("1111111111111111111111" +
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"111111111111111111111111111111111111111111")
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if err != nil {
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t.Fatalf("unable to decode hex: %v", err)
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}
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initiatorPriv, _ := btcec.PrivKeyFromBytes(btcec.S256(),
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initiatorKeyBytes)
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// We'll then do the same for the responder.
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responderKeyBytes, err := hex.DecodeString("212121212121212121212121" +
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"2121212121212121212121212121212121212121")
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if err != nil {
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t.Fatalf("unable to decode hex: %v", err)
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}
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responderPriv, responderPub := btcec.PrivKeyFromBytes(btcec.S256(),
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responderKeyBytes)
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// With the initiator's key data parsed, we'll now define a custom
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// EphemeralGenerator function for the state machine to ensure that the
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// initiator and responder both generate the ephemeral public key
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// defined within the test vectors.
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initiatorEphemeral := EphemeralGenerator(func() (*btcec.PrivateKey, error) {
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e := "121212121212121212121212121212121212121212121212121212" +
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"1212121212"
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eBytes, err := hex.DecodeString(e)
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if err != nil {
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return nil, err
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}
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priv, _ := btcec.PrivKeyFromBytes(btcec.S256(), eBytes)
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return priv, nil
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})
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responderEphemeral := EphemeralGenerator(func() (*btcec.PrivateKey, error) {
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e := "222222222222222222222222222222222222222222222222222" +
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"2222222222222"
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eBytes, err := hex.DecodeString(e)
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if err != nil {
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return nil, err
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}
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priv, _ := btcec.PrivKeyFromBytes(btcec.S256(), eBytes)
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return priv, nil
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})
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// Finally, we'll create both brontide state machines, so we can begin
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// our test.
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initiator := NewBrontideMachine(true, initiatorPriv, responderPub,
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initiatorEphemeral)
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responder := NewBrontideMachine(false, responderPriv, nil,
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responderEphemeral)
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// We'll start with the initiator generating the initial payload for
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// act one. This should consist of exactly 50 bytes. We'll assert that
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// the payload return is _exactly_ the same as what's specified within
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// the test vectors.
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actOne, err := initiator.GenActOne()
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if err != nil {
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t.Fatalf("unable to generate act one: %v", err)
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}
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expectedActOne, err := hex.DecodeString("00036360e856310ce5d294e" +
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"8be33fc807077dc56ac80d95d9cd4ddbd21325eff73f70df608655115" +
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"1f58b8afe6c195782c6a")
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if err != nil {
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t.Fatalf("unable to parse expected act one: %v", err)
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}
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if !bytes.Equal(expectedActOne, actOne[:]) {
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t.Fatalf("act one mismatch: expected %x, got %x",
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expectedActOne, actOne)
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}
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// With the assertion above passed, we'll now process the act one
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// payload with the responder of the crypto handshake.
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if err := responder.RecvActOne(actOne); err != nil {
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t.Fatalf("responder unable to process act one: %v", err)
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}
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// Next, we'll start the second act by having the responder generate
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// its contribution to the crypto handshake. We'll also verify that we
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// produce the _exact_ same byte stream as advertised within the spec's
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// test vectors.
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actTwo, err := responder.GenActTwo()
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if err != nil {
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t.Fatalf("unable to generate act two: %v", err)
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}
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expectedActTwo, err := hex.DecodeString("0002466d7fcae563e5cb09a0" +
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"d1870bb580344804617879a14949cf22285f1bae3f276e2470b93aac58" +
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"3c9ef6eafca3f730ae")
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if err != nil {
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t.Fatalf("unable to parse expected act two: %v", err)
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}
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if !bytes.Equal(expectedActTwo, actTwo[:]) {
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t.Fatalf("act two mismatch: expected %x, got %x",
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expectedActTwo, actTwo)
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}
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// Moving the handshake along, we'll also ensure that the initiator
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// accepts the act two payload.
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if err := initiator.RecvActTwo(actTwo); err != nil {
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t.Fatalf("initiator unable to process act two: %v", err)
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}
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// At the final step, we'll generate the last act from the initiator
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// and once again verify that it properly matches the test vectors.
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actThree, err := initiator.GenActThree()
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if err != nil {
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t.Fatalf("unable to generate act three: %v", err)
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}
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expectedActThree, err := hex.DecodeString("00b9e3a702e93e3a9948c2e" +
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"d6e5fd7590a6e1c3a0344cfc9d5b57357049aa22355361aa02e55a8f" +
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"c28fef5bd6d71ad0c38228dc68b1c466263b47fdf31e560e139ba")
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if err != nil {
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t.Fatalf("unable to parse expected act three: %v", err)
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}
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if !bytes.Equal(expectedActThree, actThree[:]) {
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t.Fatalf("act three mismatch: expected %x, got %x",
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expectedActThree, actThree)
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}
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// Finally, we'll ensure that the responder itself also properly parses
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// the last payload in the crypto handshake.
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if err := responder.RecvActThree(actThree); err != nil {
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t.Fatalf("responder unable to process act three: %v", err)
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}
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// As a final assertion, we'll ensure that both sides have derived the
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// proper symmetric encryption keys.
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sendingKey, err := hex.DecodeString("969ab31b4d288cedf6218839b27a3e2" +
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"140827047f2c0f01bf5c04435d43511a9")
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if err != nil {
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t.Fatalf("unable to parse sending key: %v", err)
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}
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recvKey, err := hex.DecodeString("bb9020b8965f4df047e07f955f3c4b884" +
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"18984aadc5cdb35096b9ea8fa5c3442")
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if err != nil {
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t.Fatalf("unable to parse receiving key: %v", err)
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}
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chainKey, err := hex.DecodeString("919219dbb2920afa8db80f9a51787a840" +
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"bcf111ed8d588caf9ab4be716e42b01")
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if err != nil {
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t.Fatalf("unable to parse chaining key: %v", err)
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}
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if !bytes.Equal(initiator.sendCipher.secretKey[:], sendingKey) {
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t.Fatalf("sending key mismatch: expected %x, got %x",
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initiator.sendCipher.secretKey[:], sendingKey)
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}
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if !bytes.Equal(initiator.recvCipher.secretKey[:], recvKey) {
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t.Fatalf("receiving key mismatch: expected %x, got %x",
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initiator.recvCipher.secretKey[:], recvKey)
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}
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if !bytes.Equal(initiator.chainingKey[:], chainKey) {
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t.Fatalf("chaining key mismatch: expected %x, got %x",
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initiator.chainingKey[:], chainKey)
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}
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if !bytes.Equal(responder.sendCipher.secretKey[:], recvKey) {
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t.Fatalf("sending key mismatch: expected %x, got %x",
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responder.sendCipher.secretKey[:], recvKey)
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}
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if !bytes.Equal(responder.recvCipher.secretKey[:], sendingKey) {
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t.Fatalf("receiving key mismatch: expected %x, got %x",
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responder.recvCipher.secretKey[:], sendingKey)
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}
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if !bytes.Equal(responder.chainingKey[:], chainKey) {
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t.Fatalf("chaining key mismatch: expected %x, got %x",
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responder.chainingKey[:], chainKey)
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}
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// Now test as per section "transport-message test" in Test Vectors
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// (the transportMessageVectors ciphertexts are from this section of BOLT 8);
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// we do slightly greater than 1000 encryption/decryption operations
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// to ensure that the key rotation algorithm is operating as expected.
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// The starting point for enc/decr is already guaranteed correct from the
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// above tests of sendingKey, receivingKey, chainingKey.
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transportMessageVectors := map[int]string{
|
|
0: "cf2b30ddf0cf3f80e7c35a6e6730b59fe802473180f396d88a8fb0db8cb" +
|
|
"cf25d2f214cf9ea1d95",
|
|
1: "72887022101f0b6753e0c7de21657d35a4cb2a1f5cde2650528bbc8f837" +
|
|
"d0f0d7ad833b1a256a1",
|
|
500: "178cb9d7387190fa34db9c2d50027d21793c9bc2d40b1e14dcf30ebeeeb2" +
|
|
"20f48364f7a4c68bf8",
|
|
501: "1b186c57d44eb6de4c057c49940d79bb838a145cb528d6e8fd26dbe50a6" +
|
|
"0ca2c104b56b60e45bd",
|
|
1000: "4a2f3cc3b5e78ddb83dcb426d9863d9d9a723b0337c89dd0b005d89f8d3" +
|
|
"c05c52b76b29b740f09",
|
|
1001: "2ecd8c8a5629d0d02ab457a0fdd0f7b90a192cd46be5ecb6ca570bfc5e2" +
|
|
"68338b1a16cf4ef2d36",
|
|
}
|
|
|
|
// Payload for every message is the string "hello".
|
|
payload := []byte("hello")
|
|
|
|
var buf bytes.Buffer
|
|
|
|
for i := 0; i < 1002; i++ {
|
|
err = initiator.WriteMessage(payload)
|
|
if err != nil {
|
|
t.Fatalf("could not write message %s", payload)
|
|
}
|
|
_, err = initiator.Flush(&buf)
|
|
if err != nil {
|
|
t.Fatalf("could not flush message: %v", err)
|
|
}
|
|
if val, ok := transportMessageVectors[i]; ok {
|
|
binaryVal, err := hex.DecodeString(val)
|
|
if err != nil {
|
|
t.Fatalf("Failed to decode hex string %s", val)
|
|
}
|
|
if !bytes.Equal(buf.Bytes(), binaryVal) {
|
|
t.Fatalf("Ciphertext %x was not equal to expected %s",
|
|
buf.String()[:], val)
|
|
}
|
|
}
|
|
|
|
// Responder decrypts the bytes, in every iteration, and
|
|
// should always be able to decrypt the same payload message.
|
|
plaintext, err := responder.ReadMessage(&buf)
|
|
if err != nil {
|
|
t.Fatalf("failed to read message in responder: %v", err)
|
|
}
|
|
|
|
// Ensure decryption succeeded
|
|
if !bytes.Equal(plaintext, payload) {
|
|
t.Fatalf("Decryption failed to receive plaintext: %s, got %s",
|
|
payload, plaintext)
|
|
}
|
|
|
|
// Clear out the buffer for the next iteration
|
|
buf.Reset()
|
|
}
|
|
}
|
|
|
|
// timeoutWriter wraps an io.Writer and throws an iotest.ErrTimeout after
|
|
// writing n bytes.
|
|
type timeoutWriter struct {
|
|
w io.Writer
|
|
n int64
|
|
}
|
|
|
|
func NewTimeoutWriter(w io.Writer, n int64) io.Writer {
|
|
return &timeoutWriter{w, n}
|
|
}
|
|
|
|
func (t *timeoutWriter) Write(p []byte) (int, error) {
|
|
n := len(p)
|
|
if int64(n) > t.n {
|
|
n = int(t.n)
|
|
}
|
|
n, err := t.w.Write(p[:n])
|
|
t.n -= int64(n)
|
|
if err == nil && t.n == 0 {
|
|
return n, iotest.ErrTimeout
|
|
}
|
|
return n, err
|
|
}
|
|
|
|
const payloadSize = 10
|
|
|
|
type flushChunk struct {
|
|
errAfter int64
|
|
expN int
|
|
expErr error
|
|
}
|
|
|
|
type flushTest struct {
|
|
name string
|
|
chunks []flushChunk
|
|
}
|
|
|
|
var flushTests = []flushTest{
|
|
{
|
|
name: "partial header write",
|
|
chunks: []flushChunk{
|
|
// Write 18-byte header in two parts, 16 then 2.
|
|
{
|
|
errAfter: encHeaderSize - 2,
|
|
expN: 0,
|
|
expErr: iotest.ErrTimeout,
|
|
},
|
|
{
|
|
errAfter: 2,
|
|
expN: 0,
|
|
expErr: iotest.ErrTimeout,
|
|
},
|
|
// Write payload and MAC in one go.
|
|
{
|
|
errAfter: -1,
|
|
expN: payloadSize,
|
|
},
|
|
},
|
|
},
|
|
{
|
|
name: "full payload then full mac",
|
|
chunks: []flushChunk{
|
|
// Write entire header and entire payload w/o MAC.
|
|
{
|
|
errAfter: encHeaderSize + payloadSize,
|
|
expN: payloadSize,
|
|
expErr: iotest.ErrTimeout,
|
|
},
|
|
// Write the entire MAC.
|
|
{
|
|
errAfter: -1,
|
|
expN: 0,
|
|
},
|
|
},
|
|
},
|
|
{
|
|
name: "payload-only, straddle, mac-only",
|
|
chunks: []flushChunk{
|
|
// Write header and all but last byte of payload.
|
|
{
|
|
errAfter: encHeaderSize + payloadSize - 1,
|
|
expN: payloadSize - 1,
|
|
expErr: iotest.ErrTimeout,
|
|
},
|
|
// Write last byte of payload and first byte of MAC.
|
|
{
|
|
errAfter: 2,
|
|
expN: 1,
|
|
expErr: iotest.ErrTimeout,
|
|
},
|
|
// Write 10 bytes of the MAC.
|
|
{
|
|
errAfter: 10,
|
|
expN: 0,
|
|
expErr: iotest.ErrTimeout,
|
|
},
|
|
// Write the remaining 5 MAC bytes.
|
|
{
|
|
errAfter: -1,
|
|
expN: 0,
|
|
},
|
|
},
|
|
},
|
|
}
|
|
|
|
// TestFlush asserts a Machine's ability to handle timeouts during Flush that
|
|
// cause partial writes, and that the machine can properly resume writes on
|
|
// subsequent calls to Flush.
|
|
func TestFlush(t *testing.T) {
|
|
// Run each test individually, to assert that they pass in isolation.
|
|
for _, test := range flushTests {
|
|
t.Run(test.name, func(t *testing.T) {
|
|
var (
|
|
w bytes.Buffer
|
|
b Machine
|
|
)
|
|
b.split()
|
|
testFlush(t, test, &b, &w)
|
|
})
|
|
}
|
|
|
|
// Finally, run the tests serially as if all on one connection.
|
|
t.Run("flush serial", func(t *testing.T) {
|
|
var (
|
|
w bytes.Buffer
|
|
b Machine
|
|
)
|
|
b.split()
|
|
for _, test := range flushTests {
|
|
testFlush(t, test, &b, &w)
|
|
}
|
|
})
|
|
}
|
|
|
|
// testFlush buffers a message on the Machine, then flushes it to the io.Writer
|
|
// in chunks. Once complete, a final call to flush is made to assert that Write
|
|
// is not called again.
|
|
func testFlush(t *testing.T, test flushTest, b *Machine, w io.Writer) {
|
|
payload := make([]byte, payloadSize)
|
|
if err := b.WriteMessage(payload); err != nil {
|
|
t.Fatalf("unable to write message: %v", err)
|
|
}
|
|
|
|
for _, chunk := range test.chunks {
|
|
assertFlush(t, b, w, chunk.errAfter, chunk.expN, chunk.expErr)
|
|
}
|
|
|
|
// We should always be able to call Flush after a message has been
|
|
// successfully written, and it should result in a NOP.
|
|
assertFlush(t, b, w, 0, 0, nil)
|
|
}
|
|
|
|
// assertFlush flushes a chunk to the passed io.Writer. If n >= 0, a
|
|
// timeoutWriter will be used the flush should stop with iotest.ErrTimeout after
|
|
// n bytes. The method asserts that the returned error matches expErr and that
|
|
// the number of bytes written by Flush matches expN.
|
|
func assertFlush(t *testing.T, b *Machine, w io.Writer, n int64, expN int,
|
|
expErr error) {
|
|
|
|
t.Helper()
|
|
|
|
if n >= 0 {
|
|
w = NewTimeoutWriter(w, n)
|
|
}
|
|
nn, err := b.Flush(w)
|
|
if err != expErr {
|
|
t.Fatalf("expected flush err: %v, got: %v", expErr, err)
|
|
}
|
|
if nn != expN {
|
|
t.Fatalf("expected n: %d, got: %d", expN, nn)
|
|
}
|
|
}
|