Update vendored tls-tris

- Stop buffering bytes after ClientHello
- Fix client address case missed in 2794e822

vendor/github.com/Psiphon-Labs/tls-tris/handshake_server.go

@@ -101,12 +101,13 @@ func (c *Conn) serverHandshake() error {
 			err = fmt.Errorf("passthrough: %s", err)
 		}
 
+		clientAddr := c.conn.RemoteAddr().String()
+		clientIP, _, _ := net.SplitHostPort(clientAddr)
+
 		if !doPassthrough {
 			if !obfuscator.VerifyTLSPassthroughMessage(
 				c.config.PassthroughKey, hs.clientHello.random) {
 
-				clientAddr := c.conn.RemoteAddr().String()
-				clientIP, _, _ := net.SplitHostPort(clientAddr)
 				c.config.PassthroughLogInvalidMessage(clientIP)
 
 				doPassthrough = true
@@ -116,13 +117,18 @@ func (c *Conn) serverHandshake() error {
 
 		if !doPassthrough {
 			if !c.config.PassthroughHistoryAddNew(
-				c.conn.RemoteAddr().String(), hs.clientHello.random) {
+				clientIP, hs.clientHello.random) {
 
 				doPassthrough = true
 				err = errors.New("passthrough: duplicate client random")
 			}
 		}
 
+		// Call GetReadBuffer, in both passthrough and non-passthrough cases, to
+		// stop buffering all read bytes.
+
+		passthroughReadBuffer := c.conn.(*recorderConn).GetReadBuffer().Bytes()
+
 		if doPassthrough {
 
 			// When performing passthrough, we must exit at the "return err" below.
@@ -131,8 +137,6 @@ func (c *Conn) serverHandshake() error {
 				err = errors.New("passthrough: missing error")
 			}
 
-			passthroughReadBuffer := c.conn.(*recorderConn).GetReadBuffer().Bytes()
-
 			// Modifying c.conn directly is safe only because Conn.Handshake, which
 			// calls Conn.serverHandshake, is holding c.handshakeMutex and c.in locks,
 			// and because of the serial nature of c.conn access during the handshake

vendor/vendor.json

@@ -141,10 +141,10 @@
 			"revisionTime": "2020-01-16T02:28:06Z"
 		},
 		{
-			"checksumSHA1": "vK+EtAIPYfEe9M9rSoGZYffUsxo=",
+			"checksumSHA1": "udq1ER8m9FUb3+G39Li2Q3bBi7g=",
 			"path": "github.com/Psiphon-Labs/tls-tris",
-			"revision": "16ab4b2ea797315638cb1ee75f438ef9502b617c",
-			"revisionTime": "2020-05-04T18:37:24Z"
+			"revision": "7d791789810f0e7bd780cd3846e419171739dbf8",
+			"revisionTime": "2020-06-10T16:11:56Z"
 		},
 		{
 			"checksumSHA1": "30PBqj9BW03KCVqASvLg3bR+xYc=",