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383 lines
10 KiB
383 lines
10 KiB
package conn
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import (
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"bufio"
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"encoding/hex"
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"flag"
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"fmt"
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"io"
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"log"
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"net"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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"github.com/tendermint/tendermint/crypto/ed25519"
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cmn "github.com/tendermint/tendermint/libs/common"
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)
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type kvstoreConn struct {
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*io.PipeReader
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*io.PipeWriter
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}
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func (drw kvstoreConn) Close() (err error) {
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err2 := drw.PipeWriter.CloseWithError(io.EOF)
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err1 := drw.PipeReader.Close()
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if err2 != nil {
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return err
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}
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return err1
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}
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// Each returned ReadWriteCloser is akin to a net.Connection
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func makeKVStoreConnPair() (fooConn, barConn kvstoreConn) {
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barReader, fooWriter := io.Pipe()
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fooReader, barWriter := io.Pipe()
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return kvstoreConn{fooReader, fooWriter}, kvstoreConn{barReader, barWriter}
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}
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func makeSecretConnPair(tb testing.TB) (fooSecConn, barSecConn *SecretConnection) {
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var fooConn, barConn = makeKVStoreConnPair()
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var fooPrvKey = ed25519.GenPrivKey()
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var fooPubKey = fooPrvKey.PubKey()
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var barPrvKey = ed25519.GenPrivKey()
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var barPubKey = barPrvKey.PubKey()
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// Make connections from both sides in parallel.
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var trs, ok = cmn.Parallel(
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func(_ int) (val interface{}, err error, abort bool) {
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fooSecConn, err = MakeSecretConnection(fooConn, fooPrvKey)
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if err != nil {
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tb.Errorf("Failed to establish SecretConnection for foo: %v", err)
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return nil, err, true
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}
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remotePubBytes := fooSecConn.RemotePubKey()
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if !remotePubBytes.Equals(barPubKey) {
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err = fmt.Errorf("Unexpected fooSecConn.RemotePubKey. Expected %v, got %v",
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barPubKey, fooSecConn.RemotePubKey())
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tb.Error(err)
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return nil, err, false
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}
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return nil, nil, false
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},
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func(_ int) (val interface{}, err error, abort bool) {
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barSecConn, err = MakeSecretConnection(barConn, barPrvKey)
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if barSecConn == nil {
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tb.Errorf("Failed to establish SecretConnection for bar: %v", err)
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return nil, err, true
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}
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remotePubBytes := barSecConn.RemotePubKey()
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if !remotePubBytes.Equals(fooPubKey) {
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err = fmt.Errorf("Unexpected barSecConn.RemotePubKey. Expected %v, got %v",
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fooPubKey, barSecConn.RemotePubKey())
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tb.Error(err)
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return nil, nil, false
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}
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return nil, nil, false
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},
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)
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require.Nil(tb, trs.FirstError())
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require.True(tb, ok, "Unexpected task abortion")
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return
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}
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func TestSecretConnectionHandshake(t *testing.T) {
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fooSecConn, barSecConn := makeSecretConnPair(t)
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if err := fooSecConn.Close(); err != nil {
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t.Error(err)
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}
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if err := barSecConn.Close(); err != nil {
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t.Error(err)
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}
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}
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func TestConcurrentWrite(t *testing.T) {
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fooSecConn, barSecConn := makeSecretConnPair(t)
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fooWriteText := cmn.RandStr(dataMaxSize)
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// write from two routines.
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// should be safe from race according to net.Conn:
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// https://golang.org/pkg/net/#Conn
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n := 100
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wg := new(sync.WaitGroup)
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wg.Add(3)
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go writeLots(t, wg, fooSecConn, fooWriteText, n)
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go writeLots(t, wg, fooSecConn, fooWriteText, n)
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// Consume reads from bar's reader
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readLots(t, wg, barSecConn, n*2)
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wg.Wait()
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if err := fooSecConn.Close(); err != nil {
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t.Error(err)
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}
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}
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func TestConcurrentRead(t *testing.T) {
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fooSecConn, barSecConn := makeSecretConnPair(t)
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fooWriteText := cmn.RandStr(dataMaxSize)
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n := 100
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// read from two routines.
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// should be safe from race according to net.Conn:
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// https://golang.org/pkg/net/#Conn
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wg := new(sync.WaitGroup)
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wg.Add(3)
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go readLots(t, wg, fooSecConn, n/2)
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go readLots(t, wg, fooSecConn, n/2)
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// write to bar
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writeLots(t, wg, barSecConn, fooWriteText, n)
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wg.Wait()
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if err := fooSecConn.Close(); err != nil {
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t.Error(err)
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}
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}
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func writeLots(t *testing.T, wg *sync.WaitGroup, conn net.Conn, txt string, n int) {
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defer wg.Done()
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for i := 0; i < n; i++ {
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_, err := conn.Write([]byte(txt))
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if err != nil {
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t.Fatalf("Failed to write to fooSecConn: %v", err)
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}
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}
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}
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func readLots(t *testing.T, wg *sync.WaitGroup, conn net.Conn, n int) {
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readBuffer := make([]byte, dataMaxSize)
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for i := 0; i < n; i++ {
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_, err := conn.Read(readBuffer)
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assert.NoError(t, err)
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}
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wg.Done()
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}
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func TestSecretConnectionReadWrite(t *testing.T) {
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fooConn, barConn := makeKVStoreConnPair()
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fooWrites, barWrites := []string{}, []string{}
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fooReads, barReads := []string{}, []string{}
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// Pre-generate the things to write (for foo & bar)
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for i := 0; i < 100; i++ {
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fooWrites = append(fooWrites, cmn.RandStr((cmn.RandInt()%(dataMaxSize*5))+1))
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barWrites = append(barWrites, cmn.RandStr((cmn.RandInt()%(dataMaxSize*5))+1))
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}
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// A helper that will run with (fooConn, fooWrites, fooReads) and vice versa
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genNodeRunner := func(id string, nodeConn kvstoreConn, nodeWrites []string, nodeReads *[]string) cmn.Task {
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return func(_ int) (interface{}, error, bool) {
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// Initiate cryptographic private key and secret connection trhough nodeConn.
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nodePrvKey := ed25519.GenPrivKey()
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nodeSecretConn, err := MakeSecretConnection(nodeConn, nodePrvKey)
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if err != nil {
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t.Errorf("Failed to establish SecretConnection for node: %v", err)
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return nil, err, true
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}
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// In parallel, handle some reads and writes.
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var trs, ok = cmn.Parallel(
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func(_ int) (interface{}, error, bool) {
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// Node writes:
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for _, nodeWrite := range nodeWrites {
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n, err := nodeSecretConn.Write([]byte(nodeWrite))
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if err != nil {
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t.Errorf("Failed to write to nodeSecretConn: %v", err)
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return nil, err, true
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}
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if n != len(nodeWrite) {
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err = fmt.Errorf("Failed to write all bytes. Expected %v, wrote %v", len(nodeWrite), n)
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t.Error(err)
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return nil, err, true
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}
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}
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if err := nodeConn.PipeWriter.Close(); err != nil {
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t.Error(err)
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return nil, err, true
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}
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return nil, nil, false
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},
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func(_ int) (interface{}, error, bool) {
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// Node reads:
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readBuffer := make([]byte, dataMaxSize)
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for {
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n, err := nodeSecretConn.Read(readBuffer)
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if err == io.EOF {
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return nil, nil, false
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} else if err != nil {
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t.Errorf("Failed to read from nodeSecretConn: %v", err)
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return nil, err, true
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}
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*nodeReads = append(*nodeReads, string(readBuffer[:n]))
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}
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if err := nodeConn.PipeReader.Close(); err != nil {
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t.Error(err)
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return nil, err, true
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}
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return nil, nil, false
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},
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)
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assert.True(t, ok, "Unexpected task abortion")
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// If error:
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if trs.FirstError() != nil {
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return nil, trs.FirstError(), true
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}
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// Otherwise:
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return nil, nil, false
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}
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}
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// Run foo & bar in parallel
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var trs, ok = cmn.Parallel(
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genNodeRunner("foo", fooConn, fooWrites, &fooReads),
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genNodeRunner("bar", barConn, barWrites, &barReads),
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)
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require.Nil(t, trs.FirstError())
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require.True(t, ok, "unexpected task abortion")
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// A helper to ensure that the writes and reads match.
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// Additionally, small writes (<= dataMaxSize) must be atomically read.
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compareWritesReads := func(writes []string, reads []string) {
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for {
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// Pop next write & corresponding reads
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var read, write string = "", writes[0]
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var readCount = 0
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for _, readChunk := range reads {
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read += readChunk
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readCount++
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if len(write) <= len(read) {
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break
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}
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if len(write) <= dataMaxSize {
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break // atomicity of small writes
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}
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}
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// Compare
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if write != read {
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t.Errorf("Expected to read %X, got %X", write, read)
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}
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// Iterate
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writes = writes[1:]
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reads = reads[readCount:]
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if len(writes) == 0 {
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break
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}
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}
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}
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compareWritesReads(fooWrites, barReads)
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compareWritesReads(barWrites, fooReads)
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}
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// Run go test -update from within this module
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// to update the golden test vector file
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var update = flag.Bool("update", false, "update .golden files")
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func TestDeriveSecretsAndChallengeGolden(t *testing.T) {
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goldenFilepath := filepath.Join("testdata", t.Name()+".golden")
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if *update {
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t.Logf("Updating golden test vector file %s", goldenFilepath)
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data := createGoldenTestVectors(t)
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cmn.WriteFile(goldenFilepath, []byte(data), 0644)
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}
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f, err := os.Open(goldenFilepath)
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if err != nil {
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log.Fatal(err)
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}
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defer f.Close()
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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line := scanner.Text()
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params := strings.Split(line, ",")
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randSecretVector, err := hex.DecodeString(params[0])
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require.Nil(t, err)
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randSecret := new([32]byte)
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copy((*randSecret)[:], randSecretVector)
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locIsLeast, err := strconv.ParseBool(params[1])
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require.Nil(t, err)
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expectedRecvSecret, err := hex.DecodeString(params[2])
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require.Nil(t, err)
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expectedSendSecret, err := hex.DecodeString(params[3])
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require.Nil(t, err)
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expectedChallenge, err := hex.DecodeString(params[4])
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require.Nil(t, err)
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recvSecret, sendSecret, challenge := deriveSecretAndChallenge(randSecret, locIsLeast)
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require.Equal(t, expectedRecvSecret, (*recvSecret)[:], "Recv Secrets aren't equal")
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require.Equal(t, expectedSendSecret, (*sendSecret)[:], "Send Secrets aren't equal")
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require.Equal(t, expectedChallenge, (*challenge)[:], "challenges aren't equal")
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}
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}
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// Creates the data for a test vector file.
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// The file format is:
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// Hex(diffie_hellman_secret), loc_is_least, Hex(recvSecret), Hex(sendSecret), Hex(challenge)
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func createGoldenTestVectors(t *testing.T) string {
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data := ""
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for i := 0; i < 32; i++ {
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randSecretVector := cmn.RandBytes(32)
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randSecret := new([32]byte)
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copy((*randSecret)[:], randSecretVector)
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data += hex.EncodeToString((*randSecret)[:]) + ","
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locIsLeast := cmn.RandBool()
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data += strconv.FormatBool(locIsLeast) + ","
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recvSecret, sendSecret, challenge := deriveSecretAndChallenge(randSecret, locIsLeast)
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data += hex.EncodeToString((*recvSecret)[:]) + ","
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data += hex.EncodeToString((*sendSecret)[:]) + ","
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data += hex.EncodeToString((*challenge)[:]) + "\n"
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}
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return data
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}
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func BenchmarkSecretConnection(b *testing.B) {
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b.StopTimer()
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fooSecConn, barSecConn := makeSecretConnPair(b)
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fooWriteText := cmn.RandStr(dataMaxSize)
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// Consume reads from bar's reader
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go func() {
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readBuffer := make([]byte, dataMaxSize)
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for {
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_, err := barSecConn.Read(readBuffer)
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if err == io.EOF {
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return
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} else if err != nil {
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b.Fatalf("Failed to read from barSecConn: %v", err)
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}
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}
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}()
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b.StartTimer()
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for i := 0; i < b.N; i++ {
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_, err := fooSecConn.Write([]byte(fooWriteText))
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if err != nil {
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b.Fatalf("Failed to write to fooSecConn: %v", err)
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}
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}
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b.StopTimer()
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if err := fooSecConn.Close(); err != nil {
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b.Error(err)
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}
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//barSecConn.Close() race condition
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}
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func fingerprint(bz []byte) []byte {
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const fbsize = 40
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if len(bz) < fbsize {
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return bz
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} else {
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return bz[:fbsize]
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}
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}
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