Update middleware logic

router/error.go

@@ -93,7 +93,7 @@ func (e *RequestError) AbortWithStatus(status int, c *gin.Context) {
 
 // Helper function to just abort with an internal server error. This is generally the response
 // from most errors encountered by the API.
-func (e *RequestError) AbortWithServerError(c *gin.Context) {
+func (e *RequestError) Abort(c *gin.Context) {
 	e.AbortWithStatus(http.StatusInternalServerError, c)
 }
 
@@ -128,7 +128,7 @@ func (e *RequestError) AbortFilesystemError(c *gin.Context) {
 		return
 	}
 
-	e.AbortWithServerError(c)
+	e.Abort(c)
 }
 
 // Format the error to a string and include the UUID.

router/middleware.go

@@ -3,61 +3,101 @@ package router
 import (
 	"github.com/gin-gonic/gin"
 	"github.com/google/uuid"
+	"github.com/pkg/errors"
 	"github.com/pterodactyl/wings/config"
 	"github.com/pterodactyl/wings/server"
+	"io"
 	"net/http"
 	"strings"
 )
 
+type Middleware struct{}
+
+// A custom handler function allowing for errors bubbled up by c.Error() to be returned in a
+// standardized format with tracking UUIDs on them for easier log searching.
+func (m *Middleware) ErrorHandler() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		c.Next()
+		err := c.Errors.Last()
+		if err == nil {
+			return
+		}
+
+		tracked := TrackedError(err)
+		// If there is a server in the context for this request pull it out so that we can
+		// track the error specifically for that server.
+		if s, ok := c.Get("server"); ok {
+			tracked = TrackedServerError(err, s.(*server.Server))
+		}
+
+		// Sometimes requests have already modifed the status by the time this handler is
+		// called. In those cases, try to attach the error message but don't try to change
+		// the response status since it has already been set.
+		if c.Writer.Status() != 200 {
+			if err.Error() == io.EOF.Error() {
+				c.JSON(c.Writer.Status(), gin.H{"error": "A JSON formatted body is required for this endpoint."})
+			} else {
+				tracked.AbortWithStatus(c.Writer.Status(), c)
+			}
+			return
+		}
+		tracked.Abort(c)
+		return
+	}
+}
+
 // Set the access request control headers on all of the requests.
-func SetAccessControlHeaders(c *gin.Context) {
-	c.Header("Access-Control-Allow-Headers", "Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization")
+func (m *Middleware) SetAccessControlHeaders() gin.HandlerFunc {
+	origins := config.Get().AllowedOrigins
+	location := config.Get().PanelLocation
+	return func(c *gin.Context) {
+		c.Header("Access-Control-Allow-Credentials", "true")
+		c.Header("Access-Control-Allow-Methods", "GET, POST, PATCH, PUT, DELETE, OPTIONS")
+		c.Header("Access-Control-Allow-Headers", "Accept, Accept-Encoding, Authorization, Cache-Control, Content-Type, Content-Length, Origin, X-Real-IP, X-CSRF-Token")
 
 		o := c.GetHeader("Origin")
-	if o != config.Get().PanelLocation {
-		for _, origin := range config.Get().AllowedOrigins {
+		if o != location {
+			for _, origin := range origins {
 				if origin != "*" && o != origin {
 					continue
 				}
-
 				c.Header("Access-Control-Allow-Origin", origin)
 				c.Next()
 				return
 			}
 		}
-
-	c.Header("Access-Control-Allow-Origin", config.Get().PanelLocation)
+		c.Header("Access-Control-Allow-Origin", location)
 		c.Next()
 	}
+}
 
 // Authenticates the request token against the given permission string, ensuring that
 // if it is a server permission, the token has control over that server. If it is a global
 // token, this will ensure that the request is using a properly signed global token.
-func AuthorizationMiddleware(c *gin.Context) {
+func (m *Middleware) RequireAuthorization() gin.HandlerFunc {
+	token := config.Get().AuthenticationToken
+	return func(c *gin.Context) {
 		auth := strings.SplitN(c.GetHeader("Authorization"), " ", 2)
-
 		if len(auth) != 2 || auth[0] != "Bearer" {
 			c.Header("WWW-Authenticate", "Bearer")
 			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{
 				"error": "The required authorization heads were not present in the request.",
 			})
-
 			return
 		}
 
-	// Try to match the request against the global token for the Daemon, regardless
-	// of the permission type. If nothing is matched we will fall through to the Panel
-	// API to try and validate permissions for a server.
-	if auth[1] == config.Get().AuthenticationToken {
+		// All requests to Wings must be authorized with the authentication token present in
+		// the Wings configuration file. Remeber, all requests to Wings come from the Panel
+		// backend, or using a signed JWT for temporary authentication.
+		if auth[1] == token {
 			c.Next()
-
 			return
 		}
-
 		c.AbortWithStatusJSON(http.StatusForbidden, gin.H{
 			"error": "You are not authorized to access this endpoint.",
 		})
 	}
+}
 
 // Helper function to fetch a server out of the servers collection stored in memory.
 func GetServer(uuid string) *server.Server {
@@ -68,14 +108,28 @@ func GetServer(uuid string) *server.Server {
 
 // Ensure that the requested server exists in this setup. Returns a 404 if we cannot
 // locate it.
-func ServerExists(c *gin.Context) {
+func (m *Middleware) ServerExists() gin.HandlerFunc {
+	return func(c *gin.Context) {
 		u, err := uuid.Parse(c.Param("server"))
-	if err != nil || GetServer(u.String()) == nil {
+		if err == nil {
+			if s := GetServer(u.String()); s != nil {
+				c.Set("server", s)
+				c.Next()
+				return
+			}
+		}
 		c.AbortWithStatusJSON(http.StatusNotFound, gin.H{
 			"error": "The resource you requested does not exist.",
 		})
-		return
+	}
 }
 
-	c.Next()
+// Returns the server instance from the gin context. If there is no server set in the
+// context (e.g. calling from a controller not protected by ServerExists) this function
+// will panic.
+func ExtractServer(c *gin.Context) *server.Server {
+	if s, ok := c.Get("server"); ok {
+		return s.(*server.Server)
+	}
+	panic(errors.New("cannot extract server, missing on gin context"))
 }

router/router.go

@@ -9,10 +9,9 @@ import (
 func Configure() *gin.Engine {
 	gin.SetMode("release")
 
+	m := Middleware{}
 	router := gin.New()
-
-	router.Use(gin.Recovery())
-	router.Use(SetAccessControlHeaders)
+	router.Use(gin.Recovery(), m.ErrorHandler(), m.SetAccessControlHeaders())
 	// @todo log this into a different file so you can setup IP blocking for abusive requests and such.
 	// This should still dump requests in debug mode since it does help with understanding the request
 	// lifecycle and quickly seeing what was called leading to the logs. However, it isn't feasible to mix
@@ -40,16 +39,16 @@ func Configure() *gin.Engine {
 	// This route is special it sits above all of the other requests because we are
 	// using a JWT to authorize access to it, therefore it needs to be publicly
 	// accessible.
-	router.GET("/api/servers/:server/ws", ServerExists, getServerWebsocket)
+	router.GET("/api/servers/:server/ws", m.ServerExists(), getServerWebsocket)
 
 	// This request is called by another daemon when a server is going to be transferred out.
 	// This request does not need the AuthorizationMiddleware as the panel should never call it
 	// and requests are authenticated through a JWT the panel issues to the other daemon.
-	router.GET("/api/servers/:server/archive", ServerExists, getServerArchive)
+	router.GET("/api/servers/:server/archive", m.ServerExists(), getServerArchive)
 
 	// All of the routes beyond this mount will use an authorization middleware
 	// and will not be accessible without the correct Authorization header provided.
-	protected := router.Use(AuthorizationMiddleware)
+	protected := router.Use(m.RequireAuthorization())
 	protected.POST("/api/update", postUpdateConfiguration)
 	protected.GET("/api/system", getSystemInformation)
 	protected.GET("/api/servers", getAllServers)
@@ -59,7 +58,7 @@ func Configure() *gin.Engine {
 	// These are server specific routes, and require that the request be authorized, and
 	// that the server exist on the Daemon.
 	server := router.Group("/api/servers/:server")
-	server.Use(AuthorizationMiddleware, ServerExists)
+	server.Use(m.RequireAuthorization(), m.ServerExists())
 	{
 		server.GET("", getServer)
 		server.PATCH("", patchServer)

router/router_download.go

@@ -15,7 +15,7 @@ import (
 func getDownloadBackup(c *gin.Context) {
 	token := tokens.BackupPayload{}
 	if err := tokens.ParseToken([]byte(c.Query("token")), &token); err != nil {
-		TrackedError(err).AbortWithServerError(c)
+		TrackedError(err).Abort(c)
 		return
 	}
 
@@ -36,13 +36,13 @@ func getDownloadBackup(c *gin.Context) {
 			return
 		}
 
-		TrackedServerError(err, s).AbortWithServerError(c)
+		TrackedServerError(err, s).Abort(c)
 		return
 	}
 
 	f, err := os.Open(b.Path())
 	if err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		TrackedServerError(err, s).Abort(c)
 		return
 	}
 	defer f.Close()
@@ -58,7 +58,7 @@ func getDownloadBackup(c *gin.Context) {
 func getDownloadFile(c *gin.Context) {
 	token := tokens.FilePayload{}
 	if err := tokens.ParseToken([]byte(c.Query("token")), &token); err != nil {
-		TrackedError(err).AbortWithServerError(c)
+		TrackedError(err).Abort(c)
 		return
 	}
 
@@ -75,7 +75,7 @@ func getDownloadFile(c *gin.Context) {
 	// If there is an error or we're somehow trying to download a directory, just
 	// respond with the appropriate error.
 	if err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		TrackedServerError(err, s).Abort(c)
 		return
 	} else if st.IsDir() {
 		c.AbortWithStatusJSON(http.StatusNotFound, gin.H{
@@ -86,7 +86,7 @@ func getDownloadFile(c *gin.Context) {
 
 	f, err := os.Open(p)
 	if err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		TrackedServerError(err, s).Abort(c)
 		return
 	}
 

router/router_server.go

@@ -41,7 +41,7 @@ func getServerLogs(c *gin.Context) {
 
 	out, err := s.ReadLogfile(l)
 	if err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		TrackedServerError(err, s).Abort(c)
 		return
 	}
 
@@ -110,7 +110,7 @@ func postServerCommands(c *gin.Context) {
 	s := GetServer(c.Param("server"))
 
 	if running, err := s.Environment.IsRunning(); err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		TrackedServerError(err, s).Abort(c)
 		return
 	} else if !running {
 		c.AbortWithStatusJSON(http.StatusBadGateway, gin.H{
@@ -144,7 +144,7 @@ func patchServer(c *gin.Context) {
 	buf.ReadFrom(c.Request.Body)
 
 	if err := s.UpdateDataStructure(buf.Bytes()); err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		TrackedServerError(err, s).Abort(c)
 		return
 	}
 
@@ -214,7 +214,7 @@ func deleteServer(c *gin.Context) {
 	// forcibly terminate it before removing the container, so we do not need to handle
 	// that here.
 	if err := s.Environment.Destroy(); err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		TrackedServerError(err, s).Abort(c)
 	}
 
 	// Once the environment is terminated, remove the server files from the system. This is

router/router_server_backup.go

@@ -34,7 +34,7 @@ func postServerBackup(c *gin.Context) {
 	}
 
 	if err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		TrackedServerError(err, s).Abort(c)
 		return
 	}
 
@@ -63,7 +63,7 @@ func deleteServerBackup(c *gin.Context) {
 			return
 		}
 
-		TrackedServerError(err, s).AbortWithServerError(c)
+		TrackedServerError(err, s).Abort(c)
 		return
 	}
 
@@ -72,7 +72,7 @@ func deleteServerBackup(c *gin.Context) {
 		// the backup previously and it is now missing when we go to delete, just treat it as having
 		// been successful, rather than returning a 404.
 		if !errors.Is(err, os.ErrNotExist) {
-			TrackedServerError(err, s).AbortWithServerError(c)
+			TrackedServerError(err, s).Abort(c)
 			return
 		}
 	}

router/router_server_files.go

@@ -192,7 +192,7 @@ func postServerDeleteFiles(c *gin.Context) {
 	}
 
 	if err := g.Wait(); err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		TrackedServerError(err, s).Abort(c)
 		return
 	}
 
@@ -205,7 +205,7 @@ func postServerWriteFile(c *gin.Context) {
 
 	f, err := url.QueryUnescape(c.Query("file"))
 	if err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		TrackedServerError(err, s).Abort(c)
 		return
 	}
 	f = "/" + strings.TrimLeft(f, "/")
@@ -225,6 +225,51 @@ func postServerWriteFile(c *gin.Context) {
 	c.Status(http.StatusNoContent)
 }
 
+// Writes the contents of the remote URL to a file on a server.
+func postServerDownloadRemoteFile(c *gin.Context) {
+	s := ExtractServer(c)
+	var data struct {
+		URL      string `binding:"required" json:"url"`
+		BasePath string `json:"path"`
+	}
+	if err := c.BindJSON(&data); err != nil {
+		return
+	}
+
+	u, err := url.Parse(data.URL)
+	if err != nil {
+		if e, ok := err.(*url.Error); ok {
+			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
+				"error": "An error occurred while parsing that URL: " + e.Err.Error(),
+			})
+			return
+		}
+		TrackedServerError(err, s).Abort(c)
+		return
+	}
+
+	resp, err := http.Get(u.String())
+	if err != nil {
+		TrackedServerError(err, s).Abort(c)
+		return
+	}
+	defer resp.Body.Close()
+
+	filename := strings.Split(u.Path, "/")
+	if err := s.Filesystem().Writefile(filepath.Join(data.BasePath, filename[len(filename)-1]), resp.Body); err != nil {
+		if errors.Is(err, filesystem.ErrIsDirectory) {
+			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
+				"error": "Cannot write file, name conflicts with an existing directory by the same name.",
+			})
+			return
+		}
+		TrackedServerError(err, s).AbortFilesystemError(c)
+		return
+	}
+
+	c.Status(http.StatusNoContent)
+}
+
 // Create a directory on a server.
 func postServerCreateDirectory(c *gin.Context) {
 	s := GetServer(c.Param("server"))
@@ -246,7 +291,7 @@ func postServerCreateDirectory(c *gin.Context) {
 			return
 		}
 
-		TrackedServerError(err, s).AbortWithServerError(c)
+		TrackedServerError(err, s).Abort(c)
 		return
 	}
 
@@ -315,7 +360,7 @@ func postServerDecompressFiles(c *gin.Context) {
 			return
 		}
 
-		TrackedServerError(err, s).AbortWithServerError(c)
+		TrackedServerError(err, s).Abort(c)
 		return
 	}
 
@@ -418,7 +463,7 @@ func postServerChmodFile(c *gin.Context) {
 func postServerUploadFiles(c *gin.Context) {
 	token := tokens.UploadPayload{}
 	if err := tokens.ParseToken([]byte(c.Query("token")), &token); err != nil {
-		TrackedError(err).AbortWithServerError(c)
+		TrackedError(err).Abort(c)
 		return
 	}
 

router/router_server_ws.go

@@ -14,7 +14,7 @@ func getServerWebsocket(c *gin.Context) {
 	s := GetServer(c.Param("server"))
 	handler, err := websocket.GetHandler(s, c.Writer, c.Request)
 	if err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		TrackedServerError(err, s).Abort(c)
 		return
 	}
 	defer handler.Connection.Close()

router/router_system.go

@@ -16,7 +16,7 @@ import (
 func getSystemInformation(c *gin.Context) {
 	i, err := system.GetSystemInformation()
 	if err != nil {
-		TrackedError(err).AbortWithServerError(c)
+		TrackedError(err).Abort(c)
 
 		return
 	}
@@ -45,7 +45,7 @@ func postCreateServer(c *gin.Context) {
 			return
 		}
 
-		TrackedError(err).AbortWithServerError(c)
+		TrackedError(err).Abort(c)
 		return
 	}
 
@@ -99,7 +99,7 @@ func postUpdateConfiguration(c *gin.Context) {
 		// before this code was run.
 		config.Set(&ccopy)
 
-		TrackedError(err).AbortWithServerError(c)
+		TrackedError(err).Abort(c)
 		return
 	}
 

router/router_transfer.go

@@ -37,7 +37,7 @@ func getServerArchive(c *gin.Context) {
 
 	token := tokens.TransferPayload{}
 	if err := tokens.ParseToken([]byte(auth[1]), &token); err != nil {
-		TrackedError(err).AbortWithServerError(c)
+		TrackedError(err).Abort(c)
 		return
 	}
 
@@ -53,7 +53,7 @@ func getServerArchive(c *gin.Context) {
 	st, err := s.Archiver.Stat()
 	if err != nil {
 		if !errors.Is(err, os.ErrNotExist) {
-			TrackedServerError(err, s).SetMessage("failed to stat archive").AbortWithServerError(c)
+			TrackedServerError(err, s).SetMessage("failed to stat archive").Abort(c)
 			return
 		}
 
@@ -63,7 +63,7 @@ func getServerArchive(c *gin.Context) {
 
 	checksum, err := s.Archiver.Checksum()
 	if err != nil {
-		TrackedServerError(err, s).SetMessage("failed to calculate checksum").AbortWithServerError(c)
+		TrackedServerError(err, s).SetMessage("failed to calculate checksum").Abort(c)
 		return
 	}
 
@@ -76,7 +76,7 @@ func getServerArchive(c *gin.Context) {
 			tserr.SetMessage("failed to open archive")
 		}
 
-		tserr.AbortWithServerError(c)
+		tserr.Abort(c)
 		return
 	}
 	defer file.Close()