anytls: support cleartext mode

.gitignore

@@ -22,6 +22,7 @@
 
 # dev test only
 /dev/
+.gocache/
 dev*.go
 
 *_test.go

.goreleaser.yml

@@ -14,7 +14,7 @@ builds:
       - darwin
       - freebsd
     goarch:
-          - "386"
+      - 386
       - amd64
       - arm
       - arm64
@@ -27,8 +27,8 @@ builds:
       - v1
       - v3
     goarm:
-          - "6"
-          - "7"
+      - 6
+      - 7
     gomips:
       - hardfloat
       - softfloat
@@ -49,13 +49,13 @@ archives:
       - systemd/*
 
 snapshot:
-    version_template: "{{ incpatch .Version }}-dev-{{.ShortCommit}}"
+  version_template: '{{ incpatch .Version }}-dev-{{.ShortCommit}}'
 
 checksum:
   name_template: "{{ .ProjectName }}_{{ .Version }}_checksums.txt"
 
 release:
-    prerelease: "true"
+  prerelease: true
   draft: true
 
 nfpms:
@@ -73,8 +73,8 @@ nfpms:
     dependencies:
       - libsystemd0
     bindir: /usr/bin
-      release: "1"
-      epoch: "1"
+    release: 1
+    epoch: 1
     version_metadata: git
     section: default
     priority: extra

README.md

@@ -55,6 +55,7 @@ we can set up local listeners as proxy servers, and forward requests to internet
 |Trojan         |√|√|√|√|client & server
 |Trojanc        |√|√|√|√|trojan cleartext(without tls)
 |AnyTLS         |√| |√| |client & server
+|AnyTLSc        |√| |√| |anytls cleartext(without tls)
 |VLESS          |√|√|√|√|client & server
 |VMess          | | |√|√|client only
 |SSR            | | |√| |client only
@@ -198,8 +199,8 @@ URL:
          -forward socks5://serverA:1080,socks5://serverB:1080           (proxy chain)
 
 SCHEME:
-   listen : anytls http kcp mixed pxyproto redir redir6 smux sni socks5 ss tcp tls tproxy trojan trojanc udp unix vless vsock ws wss
-   forward: anytls direct http kcp reject simple-obfs smux socks4 socks4a socks5 ss ssh ssr tcp tls trojan trojanc udp unix vless vmess vsock ws wss
+   listen : anytls anytlsc http kcp mixed pxyproto redir redir6 smux sni socks5 ss tcp tls tproxy trojan trojanc udp unix vless vsock ws wss
+   forward: anytls anytlsc direct http kcp reject simple-obfs smux socks4 socks4a socks5 ss ssh ssr tcp tls trojan trojanc udp unix vless vmess vsock ws wss
 
    Note: use 'glider -scheme all' or 'glider -scheme SCHEME' to see help info for the scheme.
 
@@ -338,9 +339,11 @@ Trojan server scheme:
 --
 AnyTLS client scheme:
   anytls://password@host:port[?serverName=SERVERNAME][&skipVerify=true][&cert=PATH][&synackTimeout=10s]
+  anytlsc://password@host:port     (cleartext, without TLS)
 
 AnyTLS server scheme:
-  anytls://password@host:port?cert=PATH&key=PATH
+  anytls://password@host:port?cert=PATH&key=PATH[&fallback=127.0.0.1:80]
+  anytlsc://password@host:port[?fallback=127.0.0.1:80]     (cleartext, without TLS)
 
 --
 Unix domain socket scheme:

config/glider.conf.example

@@ -86,7 +86,10 @@ listen=127.0.0.1:8443
 # listen=trojanc://PASSWORD@:1234?fallback=127.0.0.1
 
 # anytls server
-# listen=anytls://PASSWORD@:8443?cert=/path/to/cert&key=/path/to/key
+# listen=anytls://PASSWORD@:8443?cert=/path/to/cert&key=/path/to/key&fallback=127.0.0.1:80
+
+# anytlsc server (anytls without tls)
+# listen=anytlsc://PASSWORD@:8443?fallback=127.0.0.1:80
 
 # FORWARDERS
 # ----------
@@ -133,6 +136,9 @@ listen=127.0.0.1:8443
 # anytls as forwarder
 # forward=anytls://PASSWORD@1.1.1.1:8443[?serverName=SERVERNAME][&skipVerify=true]
 
+# anytlsc as forwarder
+# forward=anytlsc://PASSWORD@1.1.1.1:8443
+
 # vless forwarder
 # forward=vless://5a146038-0b56-4e95-b1dc-5c6f5a32cd98@1.1.1.1:443
 

proxy/anytls/anytls.go

@@ -20,10 +20,12 @@ type AnyTLS struct {
 
 	addr       string
 	password   string
+	withTLS    bool
 	serverName string
 	skipVerify bool
 	certFile   string
 	keyFile    string
+	fallback   string
 	tlsConfig  *tls.Config
 
 	synackTimeout time.Duration
@@ -41,10 +43,12 @@ func NewAnyTLS(s string, d proxy.Dialer, p proxy.Proxy) (*AnyTLS, error) {
 		proxy:         p,
 		addr:          u.Host,
 		password:      u.User.Username(),
+		withTLS:       true,
 		serverName:    query.Get("serverName"),
 		skipVerify:    query.Get("skipVerify") == "true",
 		certFile:      query.Get("cert"),
 		keyFile:       query.Get("key"),
+		fallback:      query.Get("fallback"),
 		synackTimeout: 10 * time.Second,
 	}
 	if a.password == "" {
@@ -103,8 +107,10 @@ func init() {
 	proxy.AddUsage("anytls", `
 AnyTLS client scheme:
   anytls://password@host:port[?serverName=SERVERNAME][&skipVerify=true][&cert=PATH][&synackTimeout=10s]
+  anytlsc://password@host:port     (cleartext, without TLS)
 
 AnyTLS server scheme:
-  anytls://password@host:port?cert=PATH&key=PATH
+  anytls://password@host:port?cert=PATH&key=PATH[&fallback=127.0.0.1:80]
+  anytlsc://password@host:port[?fallback=127.0.0.1:80]     (cleartext, without TLS)
 `)
 }

proxy/anytls/client.go

@@ -12,6 +12,7 @@ import (
 
 func init() {
 	proxy.RegisterDialer("anytls", NewAnyTLSDialer)
+	proxy.RegisterDialer("anytlsc", NewClearTextDialer)
 }
 
 func NewAnyTLSDialer(s string, d proxy.Dialer) (proxy.Dialer, error) {
@@ -23,6 +24,15 @@ func NewAnyTLSDialer(s string, d proxy.Dialer) (proxy.Dialer, error) {
 	return a, err
 }
 
+func NewClearTextDialer(s string, d proxy.Dialer) (proxy.Dialer, error) {
+	a, err := NewAnyTLS(s, d, nil)
+	if err != nil {
+		return nil, fmt.Errorf("[anytlsc] create instance error: %s", err)
+	}
+	a.withTLS = false
+	return a, nil
+}
+
 func (s *AnyTLS) Dial(network, addr string) (net.Conn, error) {
 	if network != "tcp" && network != "tcp4" && network != "tcp6" {
 		return nil, proxy.ErrNotSupported
@@ -63,18 +73,22 @@ func (s *AnyTLS) newClientSession() (*session, error) {
 		log.F("[anytls] dial to %s error: %s", s.addr, err)
 		return nil, err
 	}
+	c := rc
+	if s.withTLS {
 		tc := tls.Client(rc, s.tlsConfig)
 		if err := tc.Handshake(); err != nil {
 			_ = rc.Close()
 			return nil, err
 		}
-	if err := writeAuth(tc, s.password, s.padding.authPaddingLen()); err != nil {
-		_ = tc.Close()
+		c = tc
+	}
+	if err := writeAuth(c, s.password, s.padding.authPaddingLen()); err != nil {
+		_ = c.Close()
 		return nil, err
 	}
-	ss := newSession(tc)
+	ss := newSession(c)
 	if err := ss.writeFrame(frame{command: cmdSettings, data: clientSettings(s.padding)}); err != nil {
-		_ = tc.Close()
+		_ = c.Close()
 		return nil, err
 	}
 	ss.start()

proxy/anytls/server.go

@@ -1,9 +1,11 @@
 package anytls
 
 import (
+	"bytes"
 	"crypto/tls"
 	"errors"
 	"fmt"
+	"io"
 	"net"
 	"strings"
 
@@ -14,6 +16,7 @@ import (
 
 func init() {
 	proxy.RegisterServer("anytls", NewAnyTLSServer)
+	proxy.RegisterServer("anytlsc", NewClearTextServer)
 }
 
 func NewAnyTLSServer(s string, p proxy.Proxy) (proxy.Server, error) {
@@ -32,6 +35,15 @@ func NewAnyTLSServer(s string, p proxy.Proxy) (proxy.Server, error) {
 	return a, nil
 }
 
+func NewClearTextServer(s string, p proxy.Proxy) (proxy.Server, error) {
+	a, err := NewAnyTLS(s, nil, p)
+	if err != nil {
+		return nil, fmt.Errorf("[anytlsc] create instance error: %s", err)
+	}
+	a.withTLS = false
+	return a, nil
+}
+
 func (s *AnyTLS) ListenAndServe() {
 	l, err := net.Listen("tcp", s.addr)
 	if err != nil {
@@ -40,7 +52,7 @@ func (s *AnyTLS) ListenAndServe() {
 	}
 	defer l.Close()
 
-	log.F("[anytls] listening TCP on %s", s.addr)
+	log.F("[anytls] listening TCP on %s, with TLS: %v", s.addr, s.withTLS)
 	for {
 		c, err := l.Accept()
 		if err != nil {
@@ -52,19 +64,27 @@ func (s *AnyTLS) ListenAndServe() {
 }
 
 func (s *AnyTLS) Serve(c net.Conn) {
+	if s.withTLS {
 		tlsConn := tls.Server(c, s.tlsConfig)
 		if err := tlsConn.Handshake(); err != nil {
 			_ = tlsConn.Close()
 			log.F("[anytls] error in tls handshake: %s", err)
 			return
 		}
-	if err := readAuth(tlsConn, s.password); err != nil {
-		_ = tlsConn.Close()
+		c = tlsConn
+	}
+	headBuf := bytes.NewBuffer(nil)
+	if err := readAuth(io.TeeReader(c, headBuf), s.password); err != nil {
+		if s.fallback != "" {
+			s.serveFallback(c, s.fallback, headBuf)
+			return
+		}
+		_ = c.Close()
 		log.F("[anytls] auth error from %s: %s", c.RemoteAddr(), err)
 		return
 	}
 
-	ss := newSession(tlsConn)
+	ss := newSession(c)
 	ss.start()
 	for {
 		st, err := ss.acceptStream()
@@ -76,6 +96,28 @@ func (s *AnyTLS) Serve(c net.Conn) {
 	}
 }
 
+func (s *AnyTLS) serveFallback(c net.Conn, target string, headBuf *bytes.Buffer) {
+	defer c.Close()
+
+	dialer := s.proxy.NextDialer(target)
+	rc, err := dialer.Dial("tcp", target)
+	if err != nil {
+		log.F("[anytls-fallback] %s <-> %s via %s, error in dial: %v", c.RemoteAddr(), target, dialer.Addr(), err)
+		return
+	}
+	defer rc.Close()
+
+	if _, err := rc.Write(headBuf.Bytes()); err != nil {
+		log.F("[anytls-fallback] write to rc error: %v", err)
+		return
+	}
+
+	log.F("[anytls-fallback] %s <-> %s via %s", c.RemoteAddr(), target, dialer.Addr())
+	if err := proxy.Relay(c, rc); err != nil {
+		log.F("[anytls-fallback] %s <-> %s via %s, relay error: %v", c.RemoteAddr(), target, dialer.Addr(), err)
+	}
+}
+
 func (s *AnyTLS) serveStream(ss *session, st *stream) {
 	defer st.Close()