add reloader for authenticator

cmd/gost/.config/secrets.txt → .config/secrets.txt

+# period for live reloading
+reload          3s
+
 # username password
 
 $test.admin$ $123456$

README.md

@@ -19,6 +19,7 @@ gost - GO Simple Tunnel
 * 多端口监听
 * 可设置转发代理，支持多级转发(代理链)
 * 支持标准HTTP/HTTPS/HTTP2/SOCKS4(A)/SOCKS5代理协议
+* Web代理支持[探测防御](https://docs.ginuerzh.xyz/gost/probe_resist/)
 * [支持多种隧道类型](https://docs.ginuerzh.xyz/gost/configuration/)
 * [SOCKS5代理支持TLS协商加密](https://docs.ginuerzh.xyz/gost/socks/)
 * [Tunnel UDP over TCP](https://docs.ginuerzh.xyz/gost/socks/)

README_en.md

@@ -16,6 +16,7 @@ Features
 * Listening on multiple ports
 * Multi-level forward proxy - proxy chain
 * Standard HTTP/HTTPS/HTTP2/SOCKS4(A)/SOCKS5 proxy protocols support
+* [Probing resistance](https://docs.ginuerzh.xyz/gost/en/probe_resist/) support for web proxy
 * [Support multiple tunnel types](https://docs.ginuerzh.xyz/gost/en/configuration/)
 * [TLS encryption via negotiation support for SOCKS5 proxy](https://docs.ginuerzh.xyz/gost/en/socks/)
 * [Tunnel UDP over TCP](https://docs.ginuerzh.xyz/gost/en/socks/)

auth.go

+package gost
+
+import (
+	"bufio"
+	"io"
+	"strings"
+	"sync"
+	"time"
+)
+
+// Authenticator is an interface for user authentication.
+type Authenticator interface {
+	Authenticate(user, password string) bool
+}
+
+// LocalAuthenticator is an Authenticator that authenticates client by local key-value pairs.
+type LocalAuthenticator struct {
+	kvs     map[string]string
+	period  time.Duration
+	stopped chan struct{}
+	mux     sync.RWMutex
+}
+
+// NewLocalAuthenticator creates an Authenticator that authenticates client by local infos.
+func NewLocalAuthenticator(kvs map[string]string) *LocalAuthenticator {
+	return &LocalAuthenticator{
+		kvs:     kvs,
+		stopped: make(chan struct{}),
+	}
+}
+
+// Authenticate checks the validity of the provided user-password pair.
+func (au *LocalAuthenticator) Authenticate(user, password string) bool {
+	if au == nil {
+		return true
+	}
+
+	au.mux.RLock()
+	defer au.mux.RUnlock()
+
+	if len(au.kvs) == 0 {
+		return true
+	}
+
+	v, ok := au.kvs[user]
+	return ok && (v == "" || password == v)
+}
+
+// Add adds a key-value pair to the Authenticator.
+func (au *LocalAuthenticator) Add(k, v string) {
+	au.mux.Lock()
+	defer au.mux.Unlock()
+	if au.kvs == nil {
+		au.kvs = make(map[string]string)
+	}
+	au.kvs[k] = v
+}
+
+// Reload parses config from r, then live reloads the bypass.
+func (au *LocalAuthenticator) Reload(r io.Reader) error {
+	var period time.Duration
+	kvs := make(map[string]string)
+
+	if r == nil || au.Stopped() {
+		return nil
+	}
+
+	// splitLine splits a line text by white space.
+	// A line started with '#' will be ignored, otherwise it is valid.
+	split := func(line string) []string {
+		if line == "" {
+			return nil
+		}
+		line = strings.Replace(line, "\t", " ", -1)
+		line = strings.TrimSpace(line)
+
+		if strings.IndexByte(line, '#') == 0 {
+			return nil
+		}
+
+		var ss []string
+		for _, s := range strings.Split(line, " ") {
+			if s = strings.TrimSpace(s); s != "" {
+				ss = append(ss, s)
+			}
+		}
+		return ss
+	}
+
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		line := scanner.Text()
+		ss := split(line)
+		if len(ss) == 0 {
+			continue
+		}
+
+		switch ss[0] {
+		case "reload": // reload option
+			if len(ss) > 1 {
+				period, _ = time.ParseDuration(ss[1])
+			}
+		default:
+			var k, v string
+			k = ss[0]
+			if len(ss) > 1 {
+				v = ss[1]
+			}
+			kvs[k] = v
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return err
+	}
+
+	au.mux.Lock()
+	defer au.mux.Unlock()
+
+	au.period = period
+	au.kvs = kvs
+
+	return nil
+}
+
+// Period returns the reload period.
+func (au *LocalAuthenticator) Period() time.Duration {
+	if au.Stopped() {
+		return -1
+	}
+
+	au.mux.RLock()
+	defer au.mux.RUnlock()
+
+	return au.period
+}
+
+// Stop stops reloading.
+func (au *LocalAuthenticator) Stop() {
+	select {
+	case <-au.stopped:
+	default:
+		close(au.stopped)
+	}
+}
+
+// Stopped checks whether the reloader is stopped.
+func (au *LocalAuthenticator) Stopped() bool {
+	select {
+	case <-au.stopped:
+		return true
+	default:
+		return false
+	}
+}

auth_test.go

+package gost
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"net/url"
+	"testing"
+	"time"
+)
+
+var localAuthenticatorTests = []struct {
+	clientUser  *url.Userinfo
+	serverUsers []*url.Userinfo
+	valid       bool
+}{
+	{nil, nil, true},
+	{nil, []*url.Userinfo{url.User("admin")}, false},
+	{nil, []*url.Userinfo{url.UserPassword("", "123456")}, false},
+	{nil, []*url.Userinfo{url.UserPassword("admin", "123456")}, false},
+
+	{url.User("admin"), nil, true},
+	{url.User("admin"), []*url.Userinfo{url.User("admin")}, true},
+	{url.User("admin"), []*url.Userinfo{url.User("test")}, false},
+	{url.User("admin"), []*url.Userinfo{url.UserPassword("test", "123456")}, false},
+	{url.User("admin"), []*url.Userinfo{url.UserPassword("admin", "123456")}, false},
+	{url.User("admin"), []*url.Userinfo{url.UserPassword("admin", "")}, true},
+	{url.User("admin"), []*url.Userinfo{url.UserPassword("", "123456")}, false},
+
+	{url.UserPassword("", ""), nil, true},
+	{url.UserPassword("", "123456"), nil, true},
+	{url.UserPassword("", "123456"), []*url.Userinfo{url.UserPassword("", "123456")}, true},
+	{url.UserPassword("", "123456"), []*url.Userinfo{url.UserPassword("admin", "")}, false},
+	{url.UserPassword("", "123456"), []*url.Userinfo{url.UserPassword("admin", "123456")}, false},
+
+	{url.UserPassword("admin", "123456"), nil, true},
+	{url.UserPassword("admin", "123456"), []*url.Userinfo{url.User("admin")}, true},
+	{url.UserPassword("admin", "123456"), []*url.Userinfo{url.User("test")}, false},
+	{url.UserPassword("admin", "123456"), []*url.Userinfo{url.UserPassword("admin", "")}, true},
+	{url.UserPassword("admin", "123456"), []*url.Userinfo{url.UserPassword("", "123456")}, false},
+	{url.UserPassword("admin", "123456"), []*url.Userinfo{url.UserPassword("admin", "123")}, false},
+	{url.UserPassword("admin", "123456"), []*url.Userinfo{url.UserPassword("test", "123456")}, false},
+	{url.UserPassword("admin", "123456"), []*url.Userinfo{url.UserPassword("admin", "123456")}, true},
+
+	{url.UserPassword("admin", "123456"), []*url.Userinfo{
+		url.UserPassword("test", "123"),
+		url.UserPassword("admin", "123456"),
+	}, true},
+}
+
+func TestLocalAuthenticator(t *testing.T) {
+	for i, tc := range localAuthenticatorTests {
+		tc := tc
+		t.Run(fmt.Sprintf("#%d", i), func(t *testing.T) {
+			au := NewLocalAuthenticator(nil)
+			for _, u := range tc.serverUsers {
+				if u != nil {
+					p, _ := u.Password()
+					au.Add(u.Username(), p)
+				}
+			}
+
+			var u, p string
+			if tc.clientUser != nil {
+				u = tc.clientUser.Username()
+				p, _ = tc.clientUser.Password()
+			}
+			if au.Authenticate(u, p) != tc.valid {
+				t.Error("authenticate result should be", tc.valid)
+			}
+		})
+	}
+}
+
+var localAuthenticatorReloadTests = []struct {
+	r       io.Reader
+	period  time.Duration
+	kvs     map[string]string
+	stopped bool
+}{
+	{
+		r:      nil,
+		period: 0,
+		kvs:    nil,
+	},
+	{
+		r:      bytes.NewBufferString(""),
+		period: 0,
+	},
+	{
+		r:      bytes.NewBufferString("reload 10s"),
+		period: 10 * time.Second,
+	},
+	{
+		r: bytes.NewBufferString("# reload 10s\n"),
+	},
+	{
+		r:      bytes.NewBufferString("reload 10s\n#admin"),
+		period: 10 * time.Second,
+	},
+	{
+		r:      bytes.NewBufferString("reload 10s\nadmin"),
+		period: 10 * time.Second,
+		kvs: map[string]string{
+			"admin": "",
+		},
+	},
+	{
+		r: bytes.NewBufferString("# reload 10s\nadmin"),
+		kvs: map[string]string{
+			"admin": "",
+		},
+	},
+	{
+		r: bytes.NewBufferString("# reload 10s\nadmin #123456"),
+		kvs: map[string]string{
+			"admin": "#123456",
+		},
+		stopped: true,
+	},
+	{
+		r: bytes.NewBufferString("admin \t #123456\n\n\ntest \t 123456"),
+		kvs: map[string]string{
+			"admin": "#123456",
+			"test":  "123456",
+		},
+		stopped: true,
+	},
+	{
+		r: bytes.NewBufferString(`
+		$test.admin$ $123456$
+		@test.admin@ @123456@
+		test.admin# #123456#
+		test.admin\admin 123456
+		`),
+		kvs: map[string]string{
+			"$test.admin$":      "$123456$",
+			"@test.admin@":      "@123456@",
+			"test.admin#":       "#123456#",
+			"test.admin\\admin": "123456",
+		},
+		stopped: true,
+	},
+}
+
+func TestLocalAuthenticatorReload(t *testing.T) {
+	isEquals := func(a, b map[string]string) bool {
+		if len(a) == 0 && len(b) == 0 {
+			return true
+		}
+		if len(a) != len(b) {
+			return false
+		}
+
+		for k, v := range a {
+			if b[k] != v {
+				return false
+			}
+		}
+		return true
+	}
+	for i, tc := range localAuthenticatorReloadTests {
+		tc := tc
+		t.Run(fmt.Sprintf("#%d", i), func(t *testing.T) {
+			au := NewLocalAuthenticator(nil)
+
+			if err := au.Reload(tc.r); err != nil {
+				t.Error(err)
+			}
+			if au.Period() != tc.period {
+				t.Errorf("#%d test failed: period value should be %v, got %v",
+					i, tc.period, au.Period())
+			}
+			if !isEquals(au.kvs, tc.kvs) {
+				t.Errorf("#%d test failed: %v, %s", i, au.kvs, tc.kvs)
+			}
+
+			if tc.stopped {
+				au.Stop()
+				if au.Period() >= 0 {
+					t.Errorf("period of the stopped reloader should be minus value")
+				}
+				au.Stop()
+			}
+			if au.Stopped() != tc.stopped {
+				t.Errorf("#%d test failed: stopped value should be %v, got %v",
+					i, tc.stopped, au.Stopped())
+			}
+		})
+	}
+}

bypass.go

@@ -223,44 +223,22 @@ func (bp *Bypass) Reload(r io.Reader) error {
 	scanner := bufio.NewScanner(r)
 	for scanner.Scan() {
 		line := scanner.Text()
-		if n := strings.IndexByte(line, '#'); n >= 0 {
-			line = line[:n]
-		}
-		line = strings.Replace(line, "\t", " ", -1)
-		line = strings.TrimSpace(line)
-		if line == "" {
+		ss := splitLine(line)
+		if len(ss) == 0 {
 			continue
 		}
-
-		// reload option
-		if strings.HasPrefix(line, "reload ") {
-			var ss []string
-			for _, s := range strings.Split(line, " ") {
-				if s = strings.TrimSpace(s); s != "" {
-					ss = append(ss, s)
-				}
-			}
-			if len(ss) == 2 {
+		switch ss[0] {
+		case "reload": // reload option
+			if len(ss) > 1 {
 				period, _ = time.ParseDuration(ss[1])
-				continue
 			}
-		}
-
-		// reverse option
-		if strings.HasPrefix(line, "reverse ") {
-			var ss []string
-			for _, s := range strings.Split(line, " ") {
-				if s = strings.TrimSpace(s); s != "" {
-					ss = append(ss, s)
-				}
-			}
-			if len(ss) == 2 {
+		case "reverse": // reverse option
+			if len(ss) > 1 {
 				reversed, _ = strconv.ParseBool(ss[1])
-				continue
 			}
+		default:
+			matchers = append(matchers, NewMatcher(ss[0]))
 		}
-
-		matchers = append(matchers, NewMatcher(line))
 	}
 
 	if err := scanner.Err(); err != nil {

bypass_test.go

@@ -220,7 +220,7 @@ var bypassReloadTests = []struct {
 		stopped:  true,
 	},
 	{
-		r:        bytes.NewBufferString("#reverse true\n#reload 10s\n192.168.1.0/24"),
+		r:        bytes.NewBufferString("#reverse true\n#reload 10s\n192.168.1.0/24 #comment"),
 		reversed: false,
 		period:   0,
 		addr:     "192.168.10.2",
@@ -244,7 +244,7 @@ var bypassReloadTests = []struct {
 		stopped:  true,
 	},
 	{
-		r:        bytes.NewBufferString("#reverse true\n#reload 10s\nexample.com"),
+		r:        bytes.NewBufferString("#reverse true\n#reload 10s\nexample.com #comment"),
 		reversed: false,
 		period:   0,
 		addr:     "example.com",

cmd/gost/.config/probe_resist.txt

-Hello World!
\ No newline at end of file

cmd/gost/cfg.go

@@ -118,6 +118,24 @@ func parseUsers(authFile string) (users []*url.Userinfo, err error) {
 	return
 }
 
+func parseAuthenticator(s string) (gost.Authenticator, error) {
+	if s == "" {
+		return nil, nil
+	}
+	f, err := os.Open(s)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	au := gost.NewLocalAuthenticator(nil)
+	au.Reload(f)
+
+	go gost.PeriodReload(au, s)
+
+	return au, nil
+}
+
 func parseIP(s string, port string) (ips []string) {
 	if s == "" {
 		return

cmd/gost/route.go

@@ -257,12 +257,14 @@ func (r *route) GenRouters() ([]router, error) {
 		if err != nil {
 			return nil, err
 		}
-		users, err := parseUsers(node.Get("secrets"))
+		authenticator, err := parseAuthenticator(node.Get("secrets"))
 		if err != nil {
 			return nil, err
 		}
-		if node.User != nil {
-			users = append(users, node.User)
+		if authenticator == nil && node.User != nil {
+			kvs := make(map[string]string)
+			kvs[node.User.Username()], _ = node.User.Password()
+			authenticator = gost.NewLocalAuthenticator(kvs)
 		}
 		certFile, keyFile := node.Get("cert"), node.Get("key")
 		tlsCfg, err := tlsConfig(certFile, keyFile)
@@ -298,8 +300,8 @@ func (r *route) GenRouters() ([]router, error) {
 			ln, err = gost.KCPListener(node.Addr, config)
 		case "ssh":
 			config := &gost.SSHConfig{
-				Users:     users,
-				TLSConfig: tlsCfg,
+				Authenticator: authenticator,
+				TLSConfig:     tlsCfg,
 			}
 			if node.Protocol == "forward" {
 				ln, err = gost.TCPListener(node.Addr)
@@ -416,7 +418,7 @@ func (r *route) GenRouters() ([]router, error) {
 			// gost.AddrHandlerOption(node.Addr),
 			gost.AddrHandlerOption(ln.Addr().String()),
 			gost.ChainHandlerOption(chain),
-			gost.UsersHandlerOption(users...),
+			gost.AuthenticatorHandlerOption(authenticator),
 			gost.TLSConfigHandlerOption(tlsCfg),
 			gost.WhitelistHandlerOption(whitelist),
 			gost.BlacklistHandlerOption(blacklist),

gost.go

@@ -11,6 +11,7 @@ import (
 	"io"
 	"math/big"
 	"net"
+	"strings"
 	"sync"
 	"time"
 
@@ -18,7 +19,7 @@ import (
 )
 
 // Version is the gost version.
-const Version = "2.7"
+const Version = "2.7.1"
 
 // Debug is a flag that enables the debug log.
 var Debug bool
@@ -180,7 +181,22 @@ func (c *nopConn) SetWriteDeadline(t time.Time) error {
 	return &net.OpError{Op: "set", Net: "nop", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
 }
 
-// Accepter represents a network endpoint that can accept connection from peer.
-type Accepter interface {
-	Accept() (net.Conn, error)
+// splitLine splits a line text by white space, mainly used by config parser.
+func splitLine(line string) []string {
+	if line == "" {
+		return nil
+	}
+	if n := strings.IndexByte(line, '#'); n >= 0 {
+		line = line[:n]
+	}
+	line = strings.Replace(line, "\t", " ", -1)
+	line = strings.TrimSpace(line)
+
+	var ss []string
+	for _, s := range strings.Split(line, " ") {
+		if s = strings.TrimSpace(s); s != "" {
+			ss = append(ss, s)
+		}
+	}
+	return ss
 }

handler.go

@@ -20,21 +20,22 @@ type Handler interface {
 
 // HandlerOptions describes the options for Handler.
 type HandlerOptions struct {
-	Addr        string
-	Chain       *Chain
-	Users       []*url.Userinfo
-	TLSConfig   *tls.Config
-	Whitelist   *Permissions
-	Blacklist   *Permissions
-	Strategy    Strategy
-	Bypass      *Bypass
-	Retries     int
-	Timeout     time.Duration
-	Resolver    Resolver
-	Hosts       *Hosts
-	ProbeResist string
-	Node        Node
-	Host        string
+	Addr          string
+	Chain         *Chain
+	Users         []*url.Userinfo
+	Authenticator Authenticator
+	TLSConfig     *tls.Config
+	Whitelist     *Permissions
+	Blacklist     *Permissions
+	Strategy      Strategy
+	Bypass        *Bypass
+	Retries       int
+	Timeout       time.Duration
+	Resolver      Resolver
+	Hosts         *Hosts
+	ProbeResist   string
+	Node          Node
+	Host          string
 }
 
 // HandlerOption allows a common way to set handler options.
@@ -58,6 +59,23 @@ func ChainHandlerOption(chain *Chain) HandlerOption {
 func UsersHandlerOption(users ...*url.Userinfo) HandlerOption {
 	return func(opts *HandlerOptions) {
 		opts.Users = users
+
+		kvs := make(map[string]string)
+		for _, u := range users {
+			if u != nil {
+				kvs[u.Username()], _ = u.Password()
+			}
+		}
+		if len(kvs) > 0 {
+			opts.Authenticator = NewLocalAuthenticator(kvs)
+		}
+	}
+}
+
+// AuthenticatorHandlerOption sets the Authenticator option of HandlerOptions.
+func AuthenticatorHandlerOption(au Authenticator) HandlerOption {
+	return func(opts *HandlerOptions) {
+		opts.Authenticator = au
 	}
 }
 

hosts.go

@@ -4,7 +4,6 @@ import (
 	"bufio"
 	"io"
 	"net"
-	"strings"
 	"sync"
 	"time"
 
@@ -94,42 +93,28 @@ func (h *Hosts) Reload(r io.Reader) error {
 	scanner := bufio.NewScanner(r)
 	for scanner.Scan() {
 		line := scanner.Text()
-		if n := strings.IndexByte(line, '#'); n >= 0 {
-			line = line[:n]
-		}
-		line = strings.Replace(line, "\t", " ", -1)
-		line = strings.TrimSpace(line)
-		if line == "" {
-			continue
-		}
-		var ss []string
-		for _, s := range strings.Split(line, " ") {
-			if s = strings.TrimSpace(s); s != "" {
-				ss = append(ss, s)
-			}
-		}
+		ss := splitLine(line)
 		if len(ss) < 2 {
 			continue // invalid lines are ignored
 		}
 
-		// reload option
-		if strings.ToLower(ss[0]) == "reload" {
+		switch ss[0] {
+		case "reload": // reload option
 			period, _ = time.ParseDuration(ss[1])
-			continue
-		}
-
-		ip := net.ParseIP(ss[0])
-		if ip == nil {
-			continue // invalid IP addresses are ignored
-		}
-		host := Host{
-			IP:       ip,
-			Hostname: ss[1],
-		}
-		if len(ss) > 2 {
-			host.Aliases = ss[2:]
+		default:
+			ip := net.ParseIP(ss[0])
+			if ip == nil {
+				break // invalid IP addresses are ignored
+			}
+			host := Host{
+				IP:       ip,
+				Hostname: ss[1],
+			}
+			if len(ss) > 2 {
+				host.Aliases = ss[2:]
+			}
+			hosts = append(hosts, host)
 		}
-		hosts = append(hosts, host)
 	}
 	if err := scanner.Err(); err != nil {
 		return err

http.go

@@ -299,7 +299,7 @@ func (h *httpHandler) authenticate(conn net.Conn, req *http.Request, resp *http.
 		log.Logf("[http] %s -> %s : Authorization '%s' '%s'",
 			conn.RemoteAddr(), conn.LocalAddr(), u, p)
 	}
-	if authenticate(u, p, h.options.Users...) {
+	if h.options.Authenticator == nil || h.options.Authenticator.Authenticate(u, p) {
 		return true
 	}
 
@@ -423,20 +423,3 @@ func basicProxyAuth(proxyAuth string) (username, password string, ok bool) {
 
 	return cs[:s], cs[s+1:], true
 }
-
-func authenticate(username, password string, users ...*url.Userinfo) bool {
-	if len(users) == 0 {
-		return true
-	}
-
-	for _, user := range users {
-		u := user.Username()
-		p, _ := user.Password()
-		if (u == username && p == password) ||
-			(u == username && p == "") ||
-			(u == "" && p == password) {
-			return true
-		}
-	}
-	return false
-}

http2.go

@@ -457,9 +457,10 @@ func (h *http2Handler) authenticate(w http.ResponseWriter, r *http.Request, resp
 	if Debug && (u != "" || p != "") {
 		log.Logf("[http2] %s - %s : Authorization '%s' '%s'", r.RemoteAddr, laddr, u, p)
 	}
-	if authenticate(u, p, h.options.Users...) {
+	if h.options.Authenticator == nil || h.options.Authenticator.Authenticate(u, p) {
 		return true
 	}
+
 	// probing resistance is enabled
 	if ss := strings.SplitN(h.options.ProbeResist, ":", 2); len(ss) == 2 {
 		switch ss[0] {

http2_test.go

@@ -1088,7 +1088,7 @@ func TestHTTP2ProxyWithFileProbeResist(t *testing.T) {
 		Listener: ln,
 		Handler: HTTP2Handler(
 			UsersHandlerOption(url.UserPassword("admin", "123456")),
-			ProbeResistHandlerOption("file:.testdata/probe_resist.txt"),
+			ProbeResistHandlerOption("file:.config/probe_resist.txt"),
 		),
 	}
 	go server.Run()

http_test.go

@@ -26,7 +26,7 @@ var httpProxyTests = []struct {
 	{url.User("admin"), []*url.Userinfo{url.UserPassword("admin", "")}, ""},
 	{url.UserPassword("admin", "123456"), nil, ""},
 	{url.UserPassword("admin", "123456"), []*url.Userinfo{url.User("admin")}, ""},
-	{url.UserPassword("admin", "123456"), []*url.Userinfo{url.UserPassword("", "123456")}, ""},
+	{url.UserPassword("admin", "123456"), []*url.Userinfo{url.UserPassword("", "123456")}, "407 Proxy Authentication Required"},
 	{url.UserPassword("", "123456"), []*url.Userinfo{url.UserPassword("", "123456")}, ""},
 	{url.UserPassword("admin", "123456"), []*url.Userinfo{url.UserPassword("admin", "123456")}, ""},
 	{url.UserPassword("admin", "123456"), []*url.Userinfo{url.UserPassword("user", "pass"), url.UserPassword("admin", "123456")}, ""},
@@ -312,7 +312,7 @@ func TestHTTPProxyWithFileProbeResist(t *testing.T) {
 		Listener: ln,
 		Handler: HTTPHandler(
 			UsersHandlerOption(url.UserPassword("admin", "123456")),
-			ProbeResistHandlerOption("file:.testdata/probe_resist.txt"),
+			ProbeResistHandlerOption("file:.config/probe_resist.txt"),
 		),
 	}
 	go server.Run()

reload.go

@@ -17,26 +17,7 @@ type Reloader interface {
 // Stoppable is the interface that indicates a Reloader can be stopped.
 type Stoppable interface {
 	Stop()
-}
-
-//StopReloader is the interface that adds Stop method to the Reloader.
-type StopReloader interface {
-	Reloader
-	Stoppable
-}
-
-type nopStoppable struct {
-	Reloader
-}
-
-func (nopStoppable) Stop() {
-	return
-}
-
-// NopStoppable returns a StopReloader with a no-op Stop method,
-// wrapping the provided Reloader r.
-func NopStoppable(r Reloader) StopReloader {
-	return nopStoppable{r}
+	Stopped() bool
 }
 
 // PeriodReload reloads the config configFile periodically according to the period of the Reloader r.

resolver.go

@@ -278,29 +278,10 @@ func (r *resolver) Reload(rd io.Reader) error {
 		return nil
 	}
 
-	split := func(line string) []string {
-		if line == "" {
-			return nil
-		}
-		if n := strings.IndexByte(line, '#'); n >= 0 {
-			line = line[:n]
-		}
-		line = strings.Replace(line, "\t", " ", -1)
-		line = strings.TrimSpace(line)
-
-		var ss []string
-		for _, s := range strings.Split(line, " ") {
-			if s = strings.TrimSpace(s); s != "" {
-				ss = append(ss, s)
-			}
-		}
-		return ss
-	}
-
 	scanner := bufio.NewScanner(rd)
 	for scanner.Scan() {
 		line := scanner.Text()
-		ss := split(line)
+		ss := splitLine(line)
 		if len(ss) == 0 {
 			continue
 		}

server.go

@@ -8,6 +8,11 @@ import (
 	"github.com/go-log/log"
 )
 
+// Accepter represents a network endpoint that can accept connection from peer.
+type Accepter interface {
+	Accept() (net.Conn, error)
+}
+
 // Server is a proxy server.
 type Server struct {
 	Listener Listener

snapcraft.yaml

@@ -14,7 +14,7 @@ apps:
 
 parts:
   go:
-    source-tag: go1.11
+    source-tag: go1.10
   gost:
     after: [go]
     source: .

socks.go

@@ -96,9 +96,10 @@ func (selector *clientSelector) OnSelected(method uint8, conn net.Conn) (net.Con
 }
 
 type serverSelector struct {
-	methods   []uint8
-	Users     []*url.Userinfo
-	TLSConfig *tls.Config
+	methods []uint8
+	// Users     []*url.Userinfo
+	Authenticator Authenticator
+	TLSConfig     *tls.Config
 }
 
 func (selector *serverSelector) Methods() []uint8 {
@@ -121,8 +122,8 @@ func (selector *serverSelector) Select(methods ...uint8) (method uint8) {
 		}
 	}
 
-	// when user/pass is set, auth is mandatory
-	if len(selector.Users) > 0 {
+	// when Authenticator is set, auth is mandatory
+	if selector.Authenticator != nil {
 		if method == gosocks5.MethodNoAuth {
 			method = gosocks5.MethodUserPass
 		}
@@ -155,18 +156,8 @@ func (selector *serverSelector) OnSelected(method uint8, conn net.Conn) (net.Con
 		if Debug {
 			log.Logf("[socks5] %s - %s: %s", conn.RemoteAddr(), conn.LocalAddr(), req.String())
 		}
-		valid := false
-		for _, user := range selector.Users {
-			username := user.Username()
-			password, _ := user.Password()
-			if (req.Username == username && req.Password == password) ||
-				(req.Username == username && password == "") ||
-				(username == "" && req.Password == password) {
-				valid = true
-				break
-			}
-		}
-		if len(selector.Users) > 0 && !valid {
+
+		if selector.Authenticator != nil && !selector.Authenticator.Authenticate(req.Username, req.Password) {
 			resp := gosocks5.NewUserPassResponse(gosocks5.UserPassVer, gosocks5.Failure)
 			if err := resp.Write(conn); err != nil {
 				log.Logf("[socks5] %s - %s: %s", conn.RemoteAddr(), conn.LocalAddr(), err)
@@ -788,8 +779,9 @@ func (h *socks5Handler) Init(options ...HandlerOption) {
 		tlsConfig = DefaultTLSConfig
 	}
 	h.selector = &serverSelector{ // socks5 server selector
-		Users:     h.options.Users,
-		TLSConfig: tlsConfig,
+		// Users:     h.options.Users,
+		Authenticator: h.options.Authenticator,
+		TLSConfig:     tlsConfig,
 	}
 	// methods that socks5 server supported
 	h.selector.AddMethod(

socks_test.go

@@ -25,7 +25,7 @@ var socks5ProxyTests = []struct {
 	{url.User("admin"), []*url.Userinfo{url.UserPassword("admin", "")}, true},
 	{url.UserPassword("admin", "123456"), nil, true},
 	{url.UserPassword("admin", "123456"), []*url.Userinfo{url.User("admin")}, true},
-	{url.UserPassword("admin", "123456"), []*url.Userinfo{url.UserPassword("", "123456")}, true},
+	{url.UserPassword("admin", "123456"), []*url.Userinfo{url.UserPassword("", "123456")}, false},
 	{url.UserPassword("", "123456"), []*url.Userinfo{url.UserPassword("", "123456")}, true},
 	{url.UserPassword("admin", "123456"), []*url.Userinfo{url.UserPassword("admin", "123456")}, true},
 	{url.UserPassword("admin", "123456"), []*url.Userinfo{url.UserPassword("user", "pass"), url.UserPassword("admin", "123456")}, true},

ssh.go

@@ -7,7 +7,6 @@ import (
 	"errors"
 	"fmt"
 	"net"
-	"net/url"
 	"strconv"
 	"strings"
 	"sync"
@@ -466,8 +465,8 @@ func (h *sshForwardHandler) Init(options ...HandlerOption) {
 	}
 	h.config = &ssh.ServerConfig{}
 
-	h.config.PasswordCallback = defaultSSHPasswordCallback(h.options.Users...)
-	if len(h.options.Users) == 0 {
+	h.config.PasswordCallback = defaultSSHPasswordCallback(h.options.Authenticator)
+	if h.options.Authenticator == nil {
 		h.config.NoClientAuth = true
 	}
 	tlsConfig := h.options.TLSConfig
@@ -665,8 +664,8 @@ func (h *sshForwardHandler) tcpipForwardRequest(sshConn ssh.Conn, req *ssh.Reque
 
 // SSHConfig holds the SSH tunnel server config
 type SSHConfig struct {
-	Users     []*url.Userinfo
-	TLSConfig *tls.Config
+	Authenticator Authenticator
+	TLSConfig     *tls.Config
 }
 
 type sshTunnelListener struct {
@@ -688,8 +687,8 @@ func SSHTunnelListener(addr string, config *SSHConfig) (Listener, error) {
 	}
 
 	sshConfig := &ssh.ServerConfig{}
-	sshConfig.PasswordCallback = defaultSSHPasswordCallback(config.Users...)
-	if len(config.Users) == 0 {
+	sshConfig.PasswordCallback = defaultSSHPasswordCallback(config.Authenticator)
+	if config.Authenticator == nil {
 		sshConfig.NoClientAuth = true
 	}
 	tlsConfig := config.TLSConfig
@@ -808,14 +807,10 @@ func getHostPortFromAddr(addr net.Addr) (host string, port int, err error) {
 // PasswordCallbackFunc is a callback function used by SSH server.
 type PasswordCallbackFunc func(conn ssh.ConnMetadata, password []byte) (*ssh.Permissions, error)
 
-func defaultSSHPasswordCallback(users ...*url.Userinfo) PasswordCallbackFunc {
+func defaultSSHPasswordCallback(au Authenticator) PasswordCallbackFunc {
 	return func(conn ssh.ConnMetadata, password []byte) (*ssh.Permissions, error) {
-		for _, user := range users {
-			u := user.Username()
-			p, _ := user.Password()
-			if u == conn.User() && p == string(password) {
-				return nil, nil
-			}
+		if au.Authenticate(conn.User(), string(password)) {
+			return nil, nil
 		}
 		log.Logf("[ssh] %s -> %s : password rejected for %s", conn.RemoteAddr(), conn.LocalAddr(), conn.User())
 		return nil, fmt.Errorf("password rejected for %s", conn.User())