Fix "uncontrolled data use"

internal/objectstorage/filestore/file.go

@@ -44,9 +44,17 @@
 }
 
 func (s *Store) Get(ctx context.Context, gitoid string) (io.ReadCloser, error) {
-	return os.Open(filepath.Join(s.prefix, gitoid+".json"))
+	if filepath.IsLocal(gitoid) {
+		return os.Open(filepath.Join(s.prefix, gitoid+".json"))
+	} else {
+		return nil, filepath.ErrBadPattern
+	}
 }
 
 func (s *Store) Store(ctx context.Context, gitoid string, payload []byte) error {
-	return os.WriteFile(filepath.Join(s.prefix, gitoid+".json"), payload, 0644)
+	if filepath.IsLocal(gitoid) {
+		return os.WriteFile(filepath.Join(s.prefix, gitoid+".json"), payload, 0644)
+	} else {
+		return filepath.ErrBadPattern
+	}
 }

internal/objectstorage/filestore/file_test.go

@@ -0,0 +1,95 @@
+// Copyright 2024 The Archivista Contributors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package filestore_test
+
+import (
+	"context"
+	"io"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/in-toto/archivista/internal/objectstorage/filestore"
+	"github.com/stretchr/testify/suite"
+)
+
+// Test Suite: UT FileStoreSuite
+type UTFileStoreSuite struct {
+	suite.Suite
+	tempDir string
+	payload []byte
+}
+
+func TestUTFileStoreSuite(t *testing.T) {
+	suite.Run(t, new(UTFileStoreSuite))
+}
+
+func (ut *UTFileStoreSuite) SetupTest() {
+	// Create a temporary directory for testing
+	tempDir, err := os.MkdirTemp("", "filestore_test")
+	if err != nil {
+		ut.FailNow(err.Error())
+	}
+	ut.tempDir = tempDir
+	ut.payload = []byte("test payload")
+}
+
+func (ut *UTFileStoreSuite) TearDownTest() {
+	os.RemoveAll(ut.tempDir)
+}
+func (ut *UTFileStoreSuite) Test_Get() {
+
+	store, _, err := filestore.New(context.Background(), ut.tempDir, "")
+	if err != nil {
+		ut.FailNow(err.Error())
+	}
+
+	// Define a test payload
+	payload := []byte("test payload")
+
+	// Store the payload
+	err = store.Store(context.Background(), "test_gitoid", payload)
+	if err != nil {
+		ut.FailNow(err.Error())
+	}
+
+	// Attempt storing at malicious payload location
+	err = store.Store(context.Background(), "../../test_gitoid", payload)
+	if err != nil && err != filepath.ErrBadPattern {
+		ut.FailNowf("Failed to detect bad path: %v", err.Error())
+	}
+
+	// Retrieve the payload
+	reader, err := store.Get(context.Background(), "test_gitoid")
+	if err != nil {
+		ut.FailNowf("Failed to retrieve payload: %v", err.Error())
+	}
+	defer reader.Close()
+
+	// Read the payload from the reader
+	retrievedPayload, err := io.ReadAll(reader)
+	if err != nil {
+		ut.FailNowf("Failed to read payload: %v", err.Error())
+	}
+
+	// Compare the retrieved payload with the original payload
+	ut.Equal(string(retrievedPayload), string(payload))
+
+	// Attempt to retrieve non-local payload
+	_, err = store.Get(context.Background(), "/etc/passwd")
+	if err != nil && err != filepath.ErrBadPattern {
+		ut.FailNowf("Failed to detect bad path: %v", err.Error())
+	}
+
+}