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61 lines
2.0 KiB
Go
61 lines
2.0 KiB
Go
// Vikunja is a to-do list application to facilitate your life.
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// Copyright 2018-present Vikunja and contributors. All rights reserved.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package utils
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import (
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"path/filepath"
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"strings"
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)
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// ContainsPathTraversal checks if a zip entry name contains directory traversal
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// sequences that could be used to write files outside the intended directory.
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// This includes Unix-style traversal (../) and Windows-style absolute paths (C:\, \).
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func ContainsPathTraversal(name string) bool {
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cleanPath := filepath.ToSlash(filepath.Clean(name))
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// Check for parent directory traversal
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if strings.HasPrefix(cleanPath, "../") ||
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strings.Contains(cleanPath, "/../") ||
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cleanPath == ".." {
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return true
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}
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// Check for Unix absolute paths
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if strings.HasPrefix(name, "/") {
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return true
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}
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// Check for Windows-style paths: drive letters (C:), UNC paths (\\), or leading backslash
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if strings.HasPrefix(name, "\\") || strings.Contains(name, ":\\") {
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return true
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}
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// Use filepath.IsAbs to catch any platform-specific absolute paths
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// Note: filepath.IsAbs behavior varies by platform, but we check on all platforms
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// to ensure consistent validation regardless of where the server runs
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if filepath.IsAbs(name) {
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return true
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}
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// Check for Windows volume names (e.g., "C:" without backslash)
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if filepath.VolumeName(name) != "" {
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return true
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}
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return false
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}
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