implement auth middleware

api/auth.go

@@ -1 +1,65 @@
 package api
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/Pterodactyl/wings/config"
+	"github.com/Pterodactyl/wings/control"
+	"github.com/gin-gonic/gin"
+	log "github.com/sirupsen/logrus"
+)
+
+const (
+	accessTokenHeader  = "X-Access-Token"
+	accessServerHeader = "X-Access-Server"
+)
+
+type responseError struct {
+	Error string `json:"error"`
+}
+
+// AuthHandler returns a HandlerFunc that checks request authentication
+// permission is a permission string describing the required permission to access the route
+func AuthHandler(permission string) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		requestToken := c.Request.Header.Get(accessTokenHeader)
+		requestServer := c.Request.Header.Get(accessServerHeader)
+
+		if requestToken != "" {
+			// c: master controller, permissions not related to specific server
+			if strings.HasPrefix(permission, "c:") {
+				if config.Get().ContainsAuthKey(requestToken) {
+					return
+				}
+			} else {
+				// All other permission strings not starting with c: require a server to be provided
+				if requestServer != "" {
+					server := control.GetServer(requestServer)
+					if server != nil {
+						if strings.HasPrefix(permission, "g:") {
+							if config.Get().ContainsAuthKey(requestToken) {
+								return
+							}
+						}
+
+						if strings.HasPrefix(permission, "s:") {
+							if server.HasPermission(requestToken, permission) {
+								return
+							}
+						}
+					} else {
+						c.JSON(http.StatusNotFound, responseError{"Server defined in " + accessServerHeader + " is not known."})
+					}
+				} else {
+					c.JSON(http.StatusBadRequest, responseError{"No " + accessServerHeader + " header provided."})
+				}
+			}
+		} else {
+			log.Debug("Token missing in request.")
+			c.JSON(http.StatusBadRequest, responseError{"No " + accessTokenHeader + " header provided."})
+		}
+		c.JSON(http.StatusForbidden, responseError{"You are do not have permission to perform this action."})
+		c.Abort()
+	}
+}

api/auth_test.go

@@ -1,11 +1,148 @@
 package api
 
 import (
+	"net/http"
+	"net/http/httptest"
 	"testing"
 
+	"github.com/gin-gonic/gin"
 	"github.com/stretchr/testify/assert"
+
+	"github.com/Pterodactyl/wings/config"
+	"github.com/Pterodactyl/wings/control"
 )
 
-func TestFunction(t *testing.T) {
-	assert.Equal(t, 1, 1)
+const configFile = "_testdata/config.json"
+
+func TestAuthHandler(t *testing.T) {
+	gin.SetMode(gin.ReleaseMode)
+
+	t.Run("rejects missing token", func(t *testing.T) {
+		loadConfiguration(t, false)
+
+		responded, rec := requestMiddlewareWith("c:somepermission", "", "")
+
+		assert.False(t, responded)
+		assert.Equal(t, rec.Code, http.StatusBadRequest)
+	})
+
+	t.Run("rejects c:* with invalid key", func(t *testing.T) {
+		loadConfiguration(t, false)
+
+		responded, rec := requestMiddlewareWith("c:somepermission", "invalidkey", "")
+
+		assert.False(t, responded)
+		assert.Equal(t, rec.Code, http.StatusForbidden)
+	})
+
+	t.Run("accepts existing c: key", func(t *testing.T) {
+		loadConfiguration(t, false)
+
+		responded, rec := requestMiddlewareWith("c:somepermission", "existingkey", "") // TODO: working token
+
+		assert.True(t, responded)
+		assert.Equal(t, rec.Code, http.StatusOK)
+	})
+
+	t.Run("rejects missing server uuid", func(t *testing.T) {
+		loadConfiguration(t, true)
+
+		responded, rec := requestMiddlewareWith("g:test", "existingkey", "")
+
+		assert.False(t, responded)
+		assert.Equal(t, rec.Code, http.StatusBadRequest)
+	})
+
+	t.Run("rejects not existing server", func(t *testing.T) {
+		loadConfiguration(t, true)
+
+		responded, rec := requestMiddlewareWith("g:test", "existingkey", "notexistingserver")
+
+		assert.False(t, responded)
+		assert.Equal(t, rec.Code, http.StatusNotFound)
+	})
+
+	t.Run("accepts server with existing g: key", func(t *testing.T) {
+		loadConfiguration(t, true)
+
+		responded, rec := requestMiddlewareWith("g:test", "existingkey", "existingserver")
+
+		assert.True(t, responded)
+		assert.Equal(t, rec.Code, http.StatusOK)
+	})
+
+	t.Run("rejects server with not existing g: key", func(t *testing.T) {
+		loadConfiguration(t, true)
+
+		responded, rec := requestMiddlewareWith("g:test", "notexistingkey", "existingserver")
+
+		assert.False(t, responded)
+		assert.Equal(t, rec.Code, http.StatusForbidden)
+	})
+
+	t.Run("rejects server with not existing s: key", func(t *testing.T) {
+		loadConfiguration(t, true)
+
+		responded, rec := requestMiddlewareWith("s:test", "notexistingskey", "existingserver")
+
+		assert.False(t, responded)
+		assert.Equal(t, rec.Code, http.StatusForbidden)
+	})
+
+	t.Run("accepts server with existing s: key with specific permission", func(t *testing.T) {
+		loadConfiguration(t, true)
+
+		responded, rec := requestMiddlewareWith("s:test", "existingspecificskey", "existingserver")
+
+		assert.True(t, responded)
+		assert.Equal(t, rec.Code, http.StatusOK)
+	})
+
+	t.Run("accepts server with existing s: key with gloabl permission", func(t *testing.T) {
+		loadConfiguration(t, true)
+
+		responded, rec := requestMiddlewareWith("s:test", "existingglobalskey", "existingserver")
+
+		assert.True(t, responded)
+		assert.Equal(t, rec.Code, http.StatusOK)
+	})
+
+	t.Run("rejects server with existing s: key without permission", func(t *testing.T) {
+		loadConfiguration(t, true)
+
+		responded, rec := requestMiddlewareWith("s:without", "existingspecificskey", "existingserver")
+
+		assert.False(t, responded)
+		assert.Equal(t, rec.Code, http.StatusForbidden)
+	})
+}
+
+func requestMiddlewareWith(neededPermission string, token string, serverUUID string) (responded bool, recorder *httptest.ResponseRecorder) {
+	router := gin.New()
+	responded = false
+	recorder = httptest.NewRecorder()
+	req, _ := http.NewRequest("GET", "/", nil)
+
+	router.GET("/", AuthHandler(neededPermission), func(c *gin.Context) {
+		c.String(http.StatusOK, "Access granted.")
+		responded = true
+	})
+
+	req.Header.Set(accessTokenHeader, token)
+	req.Header.Set(accessServerHeader, serverUUID)
+	router.ServeHTTP(recorder, req)
+	return
+}
+
+func loadConfiguration(t *testing.T, serverConfig bool) {
+	if err := config.LoadConfiguration(configFile); err != nil {
+		t.Error(err)
+		return
+	}
+
+	if serverConfig {
+		if err := control.LoadServerConfigurations("_testdata/servers/"); err != nil {
+			t.Error(err)
+		}
+	}
 }

config/config.go

@@ -76,13 +76,16 @@ type Config struct {
 		// If set to <= 0 logs are kept forever
 		DeleteAfterDays int `mapstructure:"deleteAfterDays"`
 	} `mapstructure:"log"`
+
+	AuthKeys []string `mapstructure:"authKeys"`
 }
 
 var config *Config
 
-func LoadConfiguration(path *string) error {
-	if path != nil {
-		viper.SetConfigFile(*path)
+// LoadConfiguration loads the configuration from a specified file
+func LoadConfiguration(path string) error {
+	if path != "" {
+		viper.SetConfigFile(path)
 	} else {
 		viper.AddConfigPath("./")
 		viper.SetConfigName("config")
@@ -109,3 +112,13 @@ func Get() *Config {
 func setDefaults() {
 
 }
+
+// ContainsAuthKey checks wether the config contains a specified authentication key
+func (c *Config) ContainsAuthKey(key string) bool {
+	for _, k := range c.AuthKeys {
+		if k == key {
+			return true
+		}
+	}
+	return false
+}

config/config_test.go

@@ -6,10 +6,22 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-var configFile = "../config.example.json"
+const configFile = "../config.example.json"
 
 func TestLoadConfiguraiton(t *testing.T) {
-	err := LoadConfiguration(&configFile)
+	err := LoadConfiguration(configFile)
 	assert.Nil(t, err)
 	assert.Equal(t, Get().Web.ListenHost, "0.0.0.0")
 }
+
+func TestContainsAuthKey(t *testing.T) {
+	t.Run("key exists", func(t *testing.T) {
+		LoadConfiguration(configFile)
+		assert.True(t, Get().ContainsAuthKey("somekey"))
+	})
+
+	t.Run("key doesn't exist", func(t *testing.T) {
+		LoadConfiguration(configFile)
+		assert.False(t, Get().ContainsAuthKey("someotherkey"))
+	})
+}