Allow usersFile to be specified for basic or digest auth

docs/toml.md

@@ -191,20 +191,24 @@ Supported filters:
 # To enable basic auth on an entrypoint
 # with 2 user/pass: test:test and test2:test2
 # Passwords can be encoded in MD5, SHA1 and BCrypt: you can use htpasswd to generate those ones
+# Users can be specified directly in the toml file, or indirectly by referencing an external file; if both are provided, the two are merged, with external file contents having precedence
 # [entryPoints]
 #   [entryPoints.http]
 #   address = ":80"
 #   [entryPoints.http.auth.basic]
 #   users = ["test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/", "test2:$apr1$d9hr9HBB$4HxwgUir3HP4EsggP/QNo0"]
+#   usersFile = "/path/to/.htpasswd"
 #
 # To enable digest auth on an entrypoint
 # with 2 user/realm/pass: test:traefik:test and test2:traefik:test2
 # You can use htdigest to generate those ones
+# Users can be specified directly in the toml file, or indirectly by referencing an external file; if both are provided, the two are merged, with external file contents having precedence
 # [entryPoints]
 #   [entryPoints.http]
 #   address = ":80"
 #   [entryPoints.http.auth.basic]
 #   users = ["test:traefik:a2688e031edb4be6a3797f3882655c05 ", "test2:traefik:518845800f9e2bfb1f1f740ec24f074e"]
+#   usersFile = "/path/to/.htdigest"
 #
 # To specify an https entrypoint with a minimum TLS version, and specifying an array of cipher suites (from crypto/tls):
 # [entryPoints]
@@ -551,14 +555,17 @@ address = ":8080"
 # To enable basic auth on the webui
 # with 2 user/pass: test:test and test2:test2
 # Passwords can be encoded in MD5, SHA1 and BCrypt: you can use htpasswd to generate those ones
+# Users can be specified directly in the toml file, or indirectly by referencing an external file; if both are provided, the two are merged, with external file contents having precedence
 #   [web.auth.basic]
 #     users = ["test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/", "test2:$apr1$d9hr9HBB$4HxwgUir3HP4EsggP/QNo0"]
+#     usersFile = "/path/to/.htpasswd"
 # To enable digest auth on the webui
 # with 2 user/realm/pass: test:traefik:test and test2:traefik:test2
 # You can use htdigest to generate those ones
+# Users can be specified directly in the toml file, or indirectly by referencing an external file; if both are provided, the two are merged, with external file contents having precedence
 #   [web.auth.digest]
 #     users = ["test:traefik:a2688e031edb4be6a3797f3882655c05 ", "test2:traefik:518845800f9e2bfb1f1f740ec24f074e"]
-
+#     usersFile = "/path/to/.htdigest"
 ```
 
 - `/`: provides a simple HTML frontend of Træfik

middlewares/authenticator.go

@@ -2,6 +2,7 @@ package middlewares
 
 import (
 	"fmt"
+	"io/ioutil"
 	"net/http"
 	"strings"
 
@@ -25,7 +26,7 @@ func NewAuthenticator(authConfig *types.Auth) (*Authenticator, error) {
 	var err error
 	authenticator := Authenticator{}
 	if authConfig.Basic != nil {
-		authenticator.users, err = parserBasicUsers(authConfig.Basic.Users)
+		authenticator.users, err = parserBasicUsers(authConfig.Basic)
 		if err != nil {
 			return nil, err
 		}
@@ -43,7 +44,7 @@ func NewAuthenticator(authConfig *types.Auth) (*Authenticator, error) {
 			}
 		})
 	} else if authConfig.Digest != nil {
-		authenticator.users, err = parserDigestUsers(authConfig.Digest.Users)
+		authenticator.users, err = parserDigestUsers(authConfig.Digest)
 		if err != nil {
 			return nil, err
 		}
@@ -64,9 +65,17 @@ func NewAuthenticator(authConfig *types.Auth) (*Authenticator, error) {
 	return &authenticator, nil
 }
 
-func parserBasicUsers(users types.Users) (map[string]string, error) {
+func parserBasicUsers(basic *types.Basic) (map[string]string, error) {
+	var userStrs []string
+	if basic.UsersFile != "" {
+		var err error
+		if userStrs, err = getLinesFromFile(basic.UsersFile); err != nil {
+			return nil, err
+		}
+	}
+	userStrs = append(basic.Users, userStrs...)
 	userMap := make(map[string]string)
-	for _, user := range users {
+	for _, user := range userStrs {
 		split := strings.Split(user, ":")
 		if len(split) != 2 {
 			return nil, fmt.Errorf("Error parsing Authenticator user: %v", user)
@@ -76,9 +85,17 @@ func parserBasicUsers(users types.Users) (map[string]string, error) {
 	return userMap, nil
 }
 
-func parserDigestUsers(users types.Users) (map[string]string, error) {
+func parserDigestUsers(digest *types.Digest) (map[string]string, error) {
+	var userStrs []string
+	if digest.UsersFile != "" {
+		var err error
+		if userStrs, err = getLinesFromFile(digest.UsersFile); err != nil {
+			return nil, err
+		}
+	}
+	userStrs = append(digest.Users, userStrs...)
 	userMap := make(map[string]string)
-	for _, user := range users {
+	for _, user := range userStrs {
 		split := strings.Split(user, ":")
 		if len(split) != 3 {
 			return nil, fmt.Errorf("Error parsing Authenticator user: %v", user)
@@ -88,6 +105,23 @@ func parserDigestUsers(users types.Users) (map[string]string, error) {
 	return userMap, nil
 }
 
+func getLinesFromFile(filename string) ([]string, error) {
+	dat, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+	// Trim lines and filter out blanks
+	rawLines := strings.Split(string(dat), "\n")
+	var filteredLines []string
+	for _, rawLine := range rawLines {
+		line := strings.TrimSpace(rawLine)
+		if line != "" {
+			filteredLines = append(filteredLines, line)
+		}
+	}
+	return filteredLines, nil
+}
+
 func (a *Authenticator) secretBasic(user, realm string) string {
 	if secret, ok := a.users[user]; ok {
 		return secret

middlewares/authenticator_test.go

@@ -5,13 +5,65 @@ import (
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
+	"os"
 	"testing"
 
 	"github.com/codegangsta/negroni"
 	"github.com/containous/traefik/types"
 	"github.com/stretchr/testify/assert"
 )
 
+func TestAuthUsersFromFile(t *testing.T) {
+	tests := []struct {
+		authType   string
+		usersStr   string
+		userKeys   []string
+		parserFunc func(fileName string) (map[string]string, error)
+	}{
+		{
+			authType: "basic",
+			usersStr: "test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/\ntest2:$apr1$d9hr9HBB$4HxwgUir3HP4EsggP/QNo0\n",
+			userKeys: []string{"test", "test2"},
+			parserFunc: func(fileName string) (map[string]string, error) {
+				basic := &types.Basic{
+					UsersFile: fileName,
+				}
+				return parserBasicUsers(basic)
+			},
+		},
+		{
+			authType: "digest",
+			usersStr: "test:traefik:a2688e031edb4be6a3797f3882655c05 \ntest2:traefik:518845800f9e2bfb1f1f740ec24f074e\n",
+			userKeys: []string{"test:traefik", "test2:traefik"},
+			parserFunc: func(fileName string) (map[string]string, error) {
+				digest := &types.Digest{
+					UsersFile: fileName,
+				}
+				return parserDigestUsers(digest)
+			},
+		},
+	}
+
+	for _, test := range tests {
+		test := test
+		t.Run(test.authType, func(t *testing.T) {
+			t.Parallel()
+			usersFile, err := ioutil.TempFile("", "auth-users")
+			assert.NoError(t, err, "there should be no error")
+			defer os.Remove(usersFile.Name())
+			_, err = usersFile.Write([]byte(test.usersStr))
+			assert.NoError(t, err, "there should be no error")
+			users, err := test.parserFunc(usersFile.Name())
+			assert.NoError(t, err, "there should be no error")
+			assert.Equal(t, 2, len(users), "they should be equal")
+			_, ok := users[test.userKeys[0]]
+			assert.True(t, ok, "user test should be found")
+			_, ok = users[test.userKeys[1]]
+			assert.True(t, ok, "user test2 should be found")
+		})
+	}
+}
+
 func TestBasicAuthFail(t *testing.T) {
 	authMiddleware, err := NewAuthenticator(&types.Auth{
 		Basic: &types.Basic{

traefik.sample.toml

@@ -247,20 +247,24 @@
 # To enable basic auth on an entrypoint
 # with 2 user/pass: test:test and test2:test2
 # Passwords can be encoded in MD5, SHA1 and BCrypt: you can use htpasswd to generate those ones
+# Users can be specified directly in the toml file, or indirectly by referencing an external file; if both are provided, the two are merged, with external file contents having precedence
 # [entryPoints]
 #   [entryPoints.http]
 #   address = ":80"
 #   [entryPoints.http.auth.basic]
 #   users = ["test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/", "test2:$apr1$d9hr9HBB$4HxwgUir3HP4EsggP/QNo0"]
+#   usersFile = "/path/to/.htpasswd"
 #
 # To enable digest auth on an entrypoint
 # with 2 user/realm/pass: test:traefik:test and test2:traefik:test2
 # You can use htdigest to generate those ones
+# Users can be specified directly in the toml file, or indirectly by referencing an external file; if both are provided, the two are merged, with external file contents having precedence
 # [entryPoints]
 #   [entryPoints.http]
 #   address = ":80"
 #   [entryPoints.http.auth.basic]
 #   users = ["test:traefik:a2688e031edb4be6a3797f3882655c05 ", "test2:traefik:518845800f9e2bfb1f1f740ec24f074e"]
+#   usersFile = "/path/to/.htdigest"
 #
 # To specify an https entrypoint with a minimum TLS version, and specifying an array of cipher suites (from crypto/tls):
 # [entryPoints]
@@ -340,13 +344,17 @@
 # To enable basic auth on the webui
 # with 2 user/pass: test:test and test2:test2
 # Passwords can be encoded in MD5, SHA1 and BCrypt: you can use htpasswd to generate those ones
+# Users can be specified directly in the toml file, or indirectly by referencing an external file; if both are provided, the two are merged, with external file contents having precedence
 #   [web.auth.basic]
 #     users = ["test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/", "test2:$apr1$d9hr9HBB$4HxwgUir3HP4EsggP/QNo0"]
+#     usersFile = "/path/to/.htpasswd"
 # To enable digest auth on the webui
 # with 2 user/realm/pass: test:traefik:test and test2:traefik:test2
 # You can use htdigest to generate those ones
+# Users can be specified directly in the toml file, or indirectly by referencing an external file; if both are provided, the two are merged, with external file contents having precedence
 #   [web.auth.digest]
 #     users = ["test:traefik:a2688e031edb4be6a3797f3882655c05 ", "test2:traefik:518845800f9e2bfb1f1f740ec24f074e"]
+#     usersFile = "/path/to/.htdigest"
 
 
 ################################################################

types/types.go

@@ -241,12 +241,14 @@ type Users []string
 
 // Basic HTTP basic authentication
 type Basic struct {
-	Users `mapstructure:","`
+	Users     `mapstructure:","`
+	UsersFile string
 }
 
 // Digest HTTP authentication
 type Digest struct {
-	Users `mapstructure:","`
+	Users     `mapstructure:","`
+	UsersFile string
 }
 
 // CanonicalDomain returns a lower case domain with trim space