first commit

internal/filecheck/filecheck.go

@@ -0,0 +1,39 @@
+/*
+© Copyright IBM Corporation 2019, 2023
+
+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 filecheck
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+
+	"github.com/ibm-messaging/mq-container/internal/pathutils"
+)
+
+// CheckFileSource checks the filename is valid
+func CheckFileSource(fileName string) error {
+
+	absFile, _ := filepath.Abs(fileName)
+
+	prefixes := []string{"bin", "boot", "dev", "lib", "lib64", "proc", "sbin", "sys"}
+	for _, prefix := range prefixes {
+		if strings.HasPrefix(absFile, pathutils.CleanPath("/", prefix)) {
+			return fmt.Errorf("Filename resolves to invalid path '%v'", absFile)
+		}
+	}
+	return nil
+}

internal/filecheck/filecheck_test.go

@@ -0,0 +1,40 @@
+/*
+© Copyright IBM Corporation 2019
+
+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 filecheck
+
+import (
+	"testing"
+)
+
+func TestCheckFileSource(t *testing.T) {
+
+	invalidFilenames := []string{"/bin", "/boot", "/dev", "/lib", "/lib64", "/proc", "/sbin", "/sys", "/bin/myfile", "/boot/mydir/myfile", "/var/../dev", "/var/../lib/myfile"}
+	for _, invalidFilename := range invalidFilenames {
+		err := CheckFileSource(invalidFilename)
+		if err == nil {
+			t.Errorf("Expected to receive an error for filename '%v'", invalidFilename)
+		}
+	}
+
+	validFilenames := []string{"/var", "/mydir/dev", "/mydir/dev/myfile"}
+	for _, validFilename := range validFilenames {
+		err := CheckFileSource(validFilename)
+		if err != nil {
+			t.Errorf("Unexpected error received: %v", err)
+		}
+	}
+}