146 lines
3.3 KiB
Go
146 lines
3.3 KiB
Go
/*
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* Copyright 2022 The Dragonfly Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package rpc
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import (
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"bytes"
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"context"
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"crypto/tls"
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"fmt"
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"net"
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"github.com/soheilhy/cmux"
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"google.golang.org/grpc/credentials"
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)
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const (
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// cmux's TLS matcher read at least 3 + 1 bytes
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tlsRecordPrefix = 4
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)
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type muxTransportCredentials struct {
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credentials credentials.TransportCredentials
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tlsMatcher cmux.Matcher
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tlsPrefer bool
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}
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func WithTLSPreferClientHandshake(prefer bool) func(m *muxTransportCredentials) {
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return func(m *muxTransportCredentials) {
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m.tlsPrefer = prefer
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}
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}
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func NewMuxTransportCredentials(c *tls.Config, opts ...func(m *muxTransportCredentials)) credentials.TransportCredentials {
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m := &muxTransportCredentials{
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tlsMatcher: cmux.TLS(),
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credentials: credentials.NewTLS(c),
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}
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for _, opt := range opts {
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opt(m)
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}
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return m
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}
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func (m *muxTransportCredentials) ClientHandshake(ctx context.Context, s string, conn net.Conn) (net.Conn, credentials.AuthInfo, error) {
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if m.tlsPrefer {
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return m.credentials.ClientHandshake(ctx, s, conn)
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}
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return conn, info{credentials.CommonAuthInfo{SecurityLevel: credentials.NoSecurity}}, nil
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}
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func (m *muxTransportCredentials) ServerHandshake(conn net.Conn) (net.Conn, credentials.AuthInfo, error) {
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var prefix = make([]byte, tlsRecordPrefix)
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n, err := conn.Read(prefix)
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if err != nil {
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return nil, nil, err
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}
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if n != tlsRecordPrefix {
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_ = conn.Close()
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return nil, nil, fmt.Errorf("short read handshake")
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}
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conn = &muxConn{
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Conn: conn,
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buf: prefix,
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}
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// tls
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if m.tlsMatcher(bytes.NewReader(prefix)) {
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return m.credentials.ServerHandshake(conn)
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}
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// non-tls
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return conn, info{credentials.CommonAuthInfo{SecurityLevel: credentials.NoSecurity}}, nil
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}
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func (m *muxTransportCredentials) Info() credentials.ProtocolInfo {
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return credentials.ProtocolInfo{
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ProtocolVersion: "",
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SecurityProtocol: "mux",
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ServerName: "",
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}
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}
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func (m *muxTransportCredentials) Clone() credentials.TransportCredentials {
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return &muxTransportCredentials{
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tlsMatcher: cmux.TLS(),
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credentials: m.credentials.Clone(),
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}
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}
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func (m *muxTransportCredentials) OverrideServerName(s string) error {
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return m.credentials.OverrideServerName(s)
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}
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// info contains the auth information for an insecure connection.
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// It implements the AuthInfo interface.
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type info struct {
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credentials.CommonAuthInfo
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}
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// AuthType returns the type of info as a string.
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func (info) AuthType() string {
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return "insecure"
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}
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type muxConn struct {
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net.Conn
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buf []byte
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}
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func (m *muxConn) Read(b []byte) (int, error) {
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if len(m.buf) == 0 {
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return m.Conn.Read(b)
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}
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wn := copy(b, m.buf)
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if wn < len(m.buf) {
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m.buf = m.buf[wn:]
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return wn, nil
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}
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m.buf = nil
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b = b[wn:]
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n, err := m.Conn.Read(b)
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return n + wn, err
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}
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