s3tables: improve robustness, security, and error propagation in handlers

- Implement strict table name validation (prevention of path traversal and character enforcement)
- Add nil checks for entry.Entry in all listing loops to prevent panics
- Propagate backend errors instead of swallowing them or assuming 404
- Correctly map filer_pb.ErrNotFound to appropriate S3 error codes
- Standardize existence checks across bucket, namespace, and table handlers

weed/s3api/s3tables/handler_bucket_create.go

@@ -2,6 +2,7 @@ package s3tables
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"net/http"
 	"time"
@@ -47,17 +48,17 @@ func (h *S3TablesHandler) handleCreateTableBucket(w http.ResponseWriter, r *http
 	// Check if bucket already exists
 	exists := false
 	err := filerClient.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
-		resp, err := client.LookupDirectoryEntry(r.Context(), &filer_pb.LookupDirectoryEntryRequest{
+		_, err := filer_pb.LookupEntry(r.Context(), client, &filer_pb.LookupDirectoryEntryRequest{
 			Directory: TablesPath,
 			Name:      req.Name,
 		})
 		if err != nil {
-			// Not found is expected when creating a new bucket
-			return nil
-		}
-		if resp.Entry != nil {
-			exists = true
+			if errors.Is(err, filer_pb.ErrNotFound) {
+				return nil
+			}
+			return err
 		}
+		exists = true
 		return nil
 	})
 

weed/s3api/s3tables/handler_bucket_get_list_delete.go

@@ -48,7 +48,7 @@ func (h *S3TablesHandler) handleGetTableBucket(w http.ResponseWriter, r *http.Re
 	})
 
 	if err != nil {
-		if errors.Is(err, ErrNotFound) {
+		if errors.Is(err, filer_pb.ErrNotFound) {
 			h.writeError(w, http.StatusNotFound, ErrCodeNoSuchBucket, fmt.Sprintf("table bucket %s not found", bucketName))
 		} else {
 			h.writeError(w, http.StatusInternalServerError, ErrCodeInternalError, fmt.Sprintf("failed to get table bucket: %v", err))
@@ -108,6 +108,9 @@ func (h *S3TablesHandler) handleListTableBuckets(w http.ResponseWriter, r *http.
 				if respErr != nil {
 					break
 				}
+				if entry.Entry == nil {
+					continue
+				}
 				hasMore = true
 				lastFileName = entry.Entry.Name
 
@@ -157,7 +160,7 @@ func (h *S3TablesHandler) handleListTableBuckets(w http.ResponseWriter, r *http.
 
 	if err != nil {
 		// Check if it's a "not found" error - return empty list in that case
-		if errors.Is(err, ErrNotFound) {
+		if errors.Is(err, filer_pb.ErrNotFound) {
 			buckets = []TableBucketSummary{}
 		} else {
 			// For other errors, return error response
@@ -228,7 +231,7 @@ func (h *S3TablesHandler) handleDeleteTableBucket(w http.ResponseWriter, r *http
 	})
 
 	if err != nil {
-		if !errors.Is(err, ErrNotFound) {
+		if !errors.Is(err, filer_pb.ErrNotFound) {
 			h.writeError(w, http.StatusInternalServerError, ErrCodeInternalError, fmt.Sprintf("failed to list bucket entries: %v", err))
 			return err
 		}

weed/s3api/s3tables/handler_namespace.go

@@ -50,31 +50,34 @@ func (h *S3TablesHandler) handleCreateNamespace(w http.ResponseWriter, r *http.R
 
 	// Check if table bucket exists
 	bucketPath := getTableBucketPath(bucketName)
-	var bucketExists bool
 	err = filerClient.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
 		_, err := h.getExtendedAttribute(r.Context(), client, bucketPath, ExtendedKeyMetadata)
-		bucketExists = err == nil
-		return nil
+		return err
 	})
 
-	if !bucketExists {
-		h.writeError(w, http.StatusNotFound, ErrCodeNoSuchBucket, fmt.Sprintf("table bucket %s not found", bucketName))
-		return fmt.Errorf("bucket not found")
+	if err != nil {
+		if errors.Is(err, filer_pb.ErrNotFound) {
+			h.writeError(w, http.StatusNotFound, ErrCodeNoSuchBucket, fmt.Sprintf("table bucket %s not found", bucketName))
+		} else {
+			h.writeError(w, http.StatusInternalServerError, ErrCodeInternalError, fmt.Sprintf("failed to check table bucket: %v", err))
+		}
+		return err
 	}
 
 	namespacePath := getNamespacePath(bucketName, namespaceName)
 
 	// Check if namespace already exists
-	exists := false
 	err = filerClient.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
 		_, err := h.getExtendedAttribute(r.Context(), client, namespacePath, ExtendedKeyMetadata)
-		exists = err == nil
-		return nil
+		return err
 	})
 
-	if exists {
+	if err == nil {
 		h.writeError(w, http.StatusConflict, ErrCodeNamespaceAlreadyExists, fmt.Sprintf("namespace %s already exists", namespaceName))
 		return fmt.Errorf("namespace already exists")
+	} else if !errors.Is(err, filer_pb.ErrNotFound) {
+		h.writeError(w, http.StatusInternalServerError, ErrCodeInternalError, fmt.Sprintf("failed to check namespace: %v", err))
+		return err
 	}
 
 	// Create the namespace
@@ -231,10 +234,13 @@ func (h *S3TablesHandler) handleListNamespaces(w http.ResponseWriter, r *http.Re
 				if respErr != nil {
 					break
 				}
+				if entry.Entry == nil {
+					continue
+				}
 				hasMore = true
 				lastFileName = entry.Entry.Name
 
-				if entry.Entry == nil || !entry.Entry.IsDirectory {
+				if !entry.Entry.IsDirectory {
 					continue
 				}
 
@@ -278,7 +284,12 @@ func (h *S3TablesHandler) handleListNamespaces(w http.ResponseWriter, r *http.Re
 	})
 
 	if err != nil {
-		namespaces = []NamespaceSummary{}
+		if errors.Is(err, filer_pb.ErrNotFound) {
+			namespaces = []NamespaceSummary{}
+		} else {
+			h.writeError(w, http.StatusInternalServerError, ErrCodeInternalError, fmt.Sprintf("failed to list namespaces: %v", err))
+			return err
+		}
 	}
 
 	resp := &ListNamespacesResponse{
@@ -349,7 +360,7 @@ func (h *S3TablesHandler) handleDeleteNamespace(w http.ResponseWriter, r *http.R
 	})
 
 	if err != nil {
-		if !errors.Is(err, ErrNotFound) {
+		if !errors.Is(err, filer_pb.ErrNotFound) {
 			h.writeError(w, http.StatusInternalServerError, ErrCodeInternalError, fmt.Sprintf("failed to list namespace entries: %v", err))
 			return err
 		}

weed/s3api/s3tables/handler_policy.go

@@ -35,16 +35,18 @@ func (h *S3TablesHandler) handlePutTableBucketPolicy(w http.ResponseWriter, r *h
 
 	// Check if bucket exists
 	bucketPath := getTableBucketPath(bucketName)
-	var bucketExists bool
 	err = filerClient.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
 		_, err := h.getExtendedAttribute(r.Context(), client, bucketPath, ExtendedKeyMetadata)
-		bucketExists = err == nil
-		return nil
+		return err
 	})
 
-	if !bucketExists {
-		h.writeError(w, http.StatusNotFound, ErrCodeNoSuchBucket, fmt.Sprintf("table bucket %s not found", bucketName))
-		return fmt.Errorf("bucket not found")
+	if err != nil {
+		if errors.Is(err, filer_pb.ErrNotFound) {
+			h.writeError(w, http.StatusNotFound, ErrCodeNoSuchBucket, fmt.Sprintf("table bucket %s not found", bucketName))
+		} else {
+			h.writeError(w, http.StatusInternalServerError, ErrCodeInternalError, fmt.Sprintf("failed to check table bucket: %v", err))
+		}
+		return err
 	}
 
 	// Write policy
@@ -125,7 +127,7 @@ func (h *S3TablesHandler) handleDeleteTableBucketPolicy(w http.ResponseWriter, r
 		return h.deleteExtendedAttribute(r.Context(), client, bucketPath, ExtendedKeyPolicy)
 	})
 
-	if err != nil && !errors.Is(err, ErrNotFound) && !errors.Is(err, ErrAttributeNotFound) {
+	if err != nil && !errors.Is(err, filer_pb.ErrNotFound) && !errors.Is(err, ErrAttributeNotFound) {
 		h.writeError(w, http.StatusInternalServerError, ErrCodeInternalError, "failed to delete table bucket policy")
 		return err
 	}
@@ -166,16 +168,18 @@ func (h *S3TablesHandler) handlePutTablePolicy(w http.ResponseWriter, r *http.Re
 
 	// Check if table exists
 	tablePath := getTablePath(bucketName, namespaceName, req.Name)
-	var tableExists bool
 	err = filerClient.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
 		_, err := h.getExtendedAttribute(r.Context(), client, tablePath, ExtendedKeyMetadata)
-		tableExists = err == nil
-		return nil
+		return err
 	})
 
-	if !tableExists {
-		h.writeError(w, http.StatusNotFound, ErrCodeNoSuchTable, fmt.Sprintf("table %s not found", req.Name))
-		return fmt.Errorf("table not found")
+	if err != nil {
+		if errors.Is(err, filer_pb.ErrNotFound) {
+			h.writeError(w, http.StatusNotFound, ErrCodeNoSuchTable, fmt.Sprintf("table %s not found", req.Name))
+		} else {
+			h.writeError(w, http.StatusInternalServerError, ErrCodeInternalError, fmt.Sprintf("failed to check table: %v", err))
+		}
+		return err
 	}
 
 	// Write policy
@@ -268,7 +272,7 @@ func (h *S3TablesHandler) handleDeleteTablePolicy(w http.ResponseWriter, r *http
 		return h.deleteExtendedAttribute(r.Context(), client, tablePath, ExtendedKeyPolicy)
 	})
 
-	if err != nil && !errors.Is(err, ErrNotFound) && !errors.Is(err, ErrAttributeNotFound) {
+	if err != nil && !errors.Is(err, filer_pb.ErrNotFound) && !errors.Is(err, ErrAttributeNotFound) {
 		h.writeError(w, http.StatusInternalServerError, ErrCodeInternalError, "failed to delete table policy")
 		return err
 	}

weed/s3api/s3tables/handler_table.go

@@ -3,6 +3,7 @@ package s3tables
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"net/http"
 	"strings"
@@ -57,34 +58,48 @@ func (h *S3TablesHandler) handleCreateTable(w http.ResponseWriter, r *http.Reque
 		h.writeError(w, http.StatusBadRequest, ErrCodeInvalidRequest, "table name must be between 1 and 255 characters")
 		return fmt.Errorf("invalid table name length")
 	}
+	if req.Name == "." || req.Name == ".." || strings.Contains(req.Name, "/") {
+		h.writeError(w, http.StatusBadRequest, ErrCodeInvalidRequest, "invalid table name: cannot be '.', '..' or contain '/'")
+		return fmt.Errorf("invalid table name")
+	}
+	for _, ch := range req.Name {
+		if (ch >= 'a' && ch <= 'z') || (ch >= '0' && ch <= '9') || ch == '_' {
+			continue
+		}
+		h.writeError(w, http.StatusBadRequest, ErrCodeInvalidRequest, "invalid table name: only 'a-z', '0-9', and '_' are allowed")
+		return fmt.Errorf("invalid table name")
+	}
 
 	// Check if namespace exists
 	namespacePath := getNamespacePath(bucketName, namespaceName)
-	var namespaceExists bool
 	err = filerClient.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
 		_, err := h.getExtendedAttribute(r.Context(), client, namespacePath, ExtendedKeyMetadata)
-		namespaceExists = err == nil
-		return nil
+		return err
 	})
 
-	if !namespaceExists {
-		h.writeError(w, http.StatusNotFound, ErrCodeNoSuchNamespace, fmt.Sprintf("namespace %s not found", namespaceName))
-		return fmt.Errorf("namespace not found")
+	if err != nil {
+		if errors.Is(err, filer_pb.ErrNotFound) {
+			h.writeError(w, http.StatusNotFound, ErrCodeNoSuchNamespace, fmt.Sprintf("namespace %s not found", namespaceName))
+		} else {
+			h.writeError(w, http.StatusInternalServerError, ErrCodeInternalError, fmt.Sprintf("failed to check namespace: %v", err))
+		}
+		return err
 	}
 
 	tablePath := getTablePath(bucketName, namespaceName, req.Name)
 
 	// Check if table already exists
-	exists := false
 	err = filerClient.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
 		_, err := h.getExtendedAttribute(r.Context(), client, tablePath, ExtendedKeyMetadata)
-		exists = err == nil
-		return nil
+		return err
 	})
 
-	if exists {
+	if err == nil {
 		h.writeError(w, http.StatusConflict, ErrCodeTableAlreadyExists, fmt.Sprintf("table %s already exists", req.Name))
 		return fmt.Errorf("table already exists")
+	} else if !errors.Is(err, filer_pb.ErrNotFound) {
+		h.writeError(w, http.StatusInternalServerError, ErrCodeInternalError, fmt.Sprintf("failed to check table: %v", err))
+		return err
 	}
 
 	// Create the table
@@ -299,10 +314,13 @@ func (h *S3TablesHandler) listTablesInNamespaceWithClient(ctx context.Context, c
 			if respErr != nil {
 				break
 			}
+			if entry.Entry == nil {
+				continue
+			}
 			hasMore = true
 			lastFileName = entry.Entry.Name
 
-			if entry.Entry == nil || !entry.Entry.IsDirectory {
+			if !entry.Entry.IsDirectory {
 				continue
 			}
 
@@ -373,10 +391,13 @@ func (h *S3TablesHandler) listTablesInAllNamespaces(ctx context.Context, filerCl
 				if respErr != nil {
 					break
 				}
+				if entry.Entry == nil {
+					continue
+				}
 				hasMore = true
 				lastFileName = entry.Entry.Name
 
-				if entry.Entry == nil || !entry.Entry.IsDirectory {
+				if !entry.Entry.IsDirectory {
 					continue
 				}
 
@@ -434,16 +455,18 @@ func (h *S3TablesHandler) handleDeleteTable(w http.ResponseWriter, r *http.Reque
 	tablePath := getTablePath(bucketName, namespaceName, req.Name)
 
 	// Check if table exists
-	var tableExists bool
 	err = filerClient.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
 		_, err := h.getExtendedAttribute(r.Context(), client, tablePath, ExtendedKeyMetadata)
-		tableExists = err == nil
-		return nil
+		return err
 	})
 
-	if !tableExists {
-		h.writeError(w, http.StatusNotFound, ErrCodeNoSuchTable, fmt.Sprintf("table %s not found", req.Name))
-		return fmt.Errorf("table not found")
+	if err != nil {
+		if errors.Is(err, filer_pb.ErrNotFound) {
+			h.writeError(w, http.StatusNotFound, ErrCodeNoSuchTable, fmt.Sprintf("table %s not found", req.Name))
+		} else {
+			h.writeError(w, http.StatusInternalServerError, ErrCodeInternalError, fmt.Sprintf("failed to check table: %v", err))
+		}
+		return err
 	}
 
 	// Delete the table