KEP-3619: update cri-api version

Signed-off-by: Shingo Omura <everpeace@gmail.com>

vendor/google.golang.org/grpc/credentials/tls.go

@@ -27,9 +27,13 @@ import (
 	"net/url"
 	"os"
 
+	"google.golang.org/grpc/grpclog"
 	credinternal "google.golang.org/grpc/internal/credentials"
+	"google.golang.org/grpc/internal/envconfig"
 )
 
+var logger = grpclog.Component("credentials")
+
 // TLSInfo contains the auth information for a TLS authenticated connection.
 // It implements the AuthInfo interface.
 type TLSInfo struct {
@@ -112,6 +116,22 @@ func (c *tlsCreds) ClientHandshake(ctx context.Context, authority string, rawCon
 		conn.Close()
 		return nil, nil, ctx.Err()
 	}
+
+	// The negotiated protocol can be either of the following:
+	// 1. h2: When the server supports ALPN. Only HTTP/2 can be negotiated since
+	//    it is the only protocol advertised by the client during the handshake.
+	//    The tls library ensures that the server chooses a protocol advertised
+	//    by the client.
+	// 2. "" (empty string): If the server doesn't support ALPN. ALPN is a requirement
+	//    for using HTTP/2 over TLS. We can terminate the connection immediately.
+	np := conn.ConnectionState().NegotiatedProtocol
+	if np == "" {
+		if envconfig.EnforceALPNEnabled {
+			conn.Close()
+			return nil, nil, fmt.Errorf("credentials: cannot check peer: missing selected ALPN property")
+		}
+		logger.Warningf("Allowing TLS connection to server %q with ALPN disabled. TLS connections to servers with ALPN disabled will be disallowed in future grpc-go releases", cfg.ServerName)
+	}
 	tlsInfo := TLSInfo{
 		State: conn.ConnectionState(),
 		CommonAuthInfo: CommonAuthInfo{
@@ -131,8 +151,20 @@ func (c *tlsCreds) ServerHandshake(rawConn net.Conn) (net.Conn, AuthInfo, error)
 		conn.Close()
 		return nil, nil, err
 	}
+	cs := conn.ConnectionState()
+	// The negotiated application protocol can be empty only if the client doesn't
+	// support ALPN. In such cases, we can close the connection since ALPN is required
+	// for using HTTP/2 over TLS.
+	if cs.NegotiatedProtocol == "" {
+		if envconfig.EnforceALPNEnabled {
+			conn.Close()
+			return nil, nil, fmt.Errorf("credentials: cannot check peer: missing selected ALPN property")
+		} else if logger.V(2) {
+			logger.Info("Allowing TLS connection from client with ALPN disabled. TLS connections with ALPN disabled will be disallowed in future grpc-go releases")
+		}
+	}
 	tlsInfo := TLSInfo{
-		State: conn.ConnectionState(),
+		State: cs,
 		CommonAuthInfo: CommonAuthInfo{
 			SecurityLevel: PrivacyAndIntegrity,
 		},