|
| 1 | +package filex |
| 2 | + |
| 3 | +import ( |
| 4 | + "archive/zip" |
| 5 | + "bytes" |
| 6 | + "os" |
| 7 | + "path/filepath" |
| 8 | + "testing" |
| 9 | + |
| 10 | + "github.com/pingcap/failpoint" |
| 11 | + "github.com/stretchr/testify/assert" |
| 12 | + "github.com/stretchr/testify/require" |
| 13 | +) |
| 14 | + |
| 15 | +func TestUnzipTo(t *testing.T) { |
| 16 | + tempDir := t.TempDir() |
| 17 | + targetDir := filepath.Join(tempDir, "target") |
| 18 | + err := os.Mkdir(targetDir, 0o755) |
| 19 | + require.NoError(t, err) |
| 20 | + |
| 21 | + t.Run("Normal unzip", func(t *testing.T) { |
| 22 | + // Create a valid zip file |
| 23 | + buf := new(bytes.Buffer) |
| 24 | + w := zip.NewWriter(buf) |
| 25 | + f, err := w.Create("hello.txt") |
| 26 | + require.NoError(t, err) |
| 27 | + _, err = f.Write([]byte("world")) |
| 28 | + require.NoError(t, err) |
| 29 | + err = w.Close() |
| 30 | + require.NoError(t, err) |
| 31 | + |
| 32 | + // Read it back |
| 33 | + r, err := zip.NewReader(bytes.NewReader(buf.Bytes()), int64(buf.Len())) |
| 34 | + require.NoError(t, err) |
| 35 | + |
| 36 | + err = UnzipTo(r.File[0], targetDir, "hello.txt") |
| 37 | + assert.NoError(t, err) |
| 38 | + |
| 39 | + content, err := os.ReadFile(filepath.Join(targetDir, "hello.txt")) |
| 40 | + assert.NoError(t, err) |
| 41 | + assert.Equal(t, "world", string(content)) |
| 42 | + }) |
| 43 | + |
| 44 | + t.Run("Unzip to subdir", func(t *testing.T) { |
| 45 | + // Create a valid zip file |
| 46 | + buf := new(bytes.Buffer) |
| 47 | + w := zip.NewWriter(buf) |
| 48 | + f, err := w.Create("sub/test.txt") |
| 49 | + require.NoError(t, err) |
| 50 | + _, err = f.Write([]byte("subdir content")) |
| 51 | + require.NoError(t, err) |
| 52 | + err = w.Close() |
| 53 | + require.NoError(t, err) |
| 54 | + |
| 55 | + r, err := zip.NewReader(bytes.NewReader(buf.Bytes()), int64(buf.Len())) |
| 56 | + require.NoError(t, err) |
| 57 | + |
| 58 | + // We passed "sub/test.txt" as name to UnzipTo |
| 59 | + err = UnzipTo(r.File[0], targetDir, "sub/test.txt") |
| 60 | + assert.NoError(t, err) |
| 61 | + |
| 62 | + content, err := os.ReadFile(filepath.Join(targetDir, "sub", "test.txt")) |
| 63 | + assert.NoError(t, err) |
| 64 | + assert.Equal(t, "subdir content", string(content)) |
| 65 | + }) |
| 66 | + |
| 67 | + t.Run("Path traversal attempt", func(t *testing.T) { |
| 68 | + // Create a zip file |
| 69 | + buf := new(bytes.Buffer) |
| 70 | + w := zip.NewWriter(buf) |
| 71 | + f, err := w.Create("traversal.txt") |
| 72 | + require.NoError(t, err) |
| 73 | + _, err = f.Write([]byte("hacker")) |
| 74 | + require.NoError(t, err) |
| 75 | + err = w.Close() |
| 76 | + require.NoError(t, err) |
| 77 | + |
| 78 | + r, err := zip.NewReader(bytes.NewReader(buf.Bytes()), int64(buf.Len())) |
| 79 | + require.NoError(t, err) |
| 80 | + |
| 81 | + // Try to extract with a path traversal name |
| 82 | + // Note: UnzipTo takes the name argument directly for the destination filename |
| 83 | + // If we pass a name with "..", os.OpenRoot should block it |
| 84 | + err = UnzipTo(r.File[0], targetDir, "../outside.txt") |
| 85 | + assert.Error(t, err) |
| 86 | + // Expected error from os.OpenRoot checks or similar |
| 87 | + // The error message from os.OpenRoot/OpenFile when path escapes is usually "path escapes from parent" |
| 88 | + if err != nil { |
| 89 | + assert.Contains(t, err.Error(), "path escapes from parent") |
| 90 | + } |
| 91 | + }) |
| 92 | + |
| 93 | + t.Run("Target directory creation", func(t *testing.T) { |
| 94 | + // Ensure target directory does NOT exist |
| 95 | + newTargetDir := filepath.Join(tempDir, "new_target") |
| 96 | + |
| 97 | + validZipBuf := new(bytes.Buffer) |
| 98 | + w := zip.NewWriter(validZipBuf) |
| 99 | + f, err := w.Create("created.txt") |
| 100 | + require.NoError(t, err) |
| 101 | + _, err = f.Write([]byte("created")) |
| 102 | + require.NoError(t, err) |
| 103 | + w.Close() |
| 104 | + |
| 105 | + r, err := zip.NewReader(bytes.NewReader(validZipBuf.Bytes()), int64(validZipBuf.Len())) |
| 106 | + require.NoError(t, err) |
| 107 | + |
| 108 | + // Should succeed and create directory |
| 109 | + err = UnzipTo(r.File[0], newTargetDir, "created.txt") |
| 110 | + assert.NoError(t, err) |
| 111 | + |
| 112 | + content, err := os.ReadFile(filepath.Join(newTargetDir, "created.txt")) |
| 113 | + assert.NoError(t, err) |
| 114 | + assert.Equal(t, "created", string(content)) |
| 115 | + }) |
| 116 | + t.Run("Failpoint error", func(t *testing.T) { |
| 117 | + failpoint.Enable("github.com/lf-edge/ekuiper/v2/internal/pkg/filex/UnzipToErr", "return(true)") |
| 118 | + defer failpoint.Disable("github.com/lf-edge/ekuiper/v2/internal/pkg/filex/UnzipToErr") |
| 119 | + |
| 120 | + // Valid zip but should fail due to injection |
| 121 | + buf := new(bytes.Buffer) |
| 122 | + w := zip.NewWriter(buf) |
| 123 | + f, err := w.Create("fail.txt") |
| 124 | + require.NoError(t, err) |
| 125 | + _, err = f.Write([]byte("test")) |
| 126 | + require.NoError(t, err) |
| 127 | + w.Close() |
| 128 | + |
| 129 | + r, err := zip.NewReader(bytes.NewReader(buf.Bytes()), int64(buf.Len())) |
| 130 | + require.NoError(t, err) |
| 131 | + |
| 132 | + err = UnzipTo(r.File[0], targetDir, "fail.txt") |
| 133 | + // Only check error message if error occurred (failpoints enabled) |
| 134 | + if err != nil { |
| 135 | + assert.Equal(t, "UnzipToErr", err.Error()) |
| 136 | + } else { |
| 137 | + t.Log("Skipping failpoint check as no error was returned (failpoints likely disabled)") |
| 138 | + } |
| 139 | + }) |
| 140 | + |
| 141 | + t.Run("Destination is file", func(t *testing.T) { |
| 142 | + // Create a file where directory should be |
| 143 | + fileAsDir := filepath.Join(tempDir, "file_as_dir") |
| 144 | + err := os.WriteFile(fileAsDir, []byte("blocker"), 0o644) |
| 145 | + require.NoError(t, err) |
| 146 | + |
| 147 | + buf := new(bytes.Buffer) |
| 148 | + w := zip.NewWriter(buf) |
| 149 | + _, err = w.Create("file.txt") |
| 150 | + require.NoError(t, err) |
| 151 | + w.Close() |
| 152 | + |
| 153 | + r, err := zip.NewReader(bytes.NewReader(buf.Bytes()), int64(buf.Len())) |
| 154 | + require.NoError(t, err) |
| 155 | + |
| 156 | + // Should fail to MkdirAll/OpenRoot |
| 157 | + err = UnzipTo(r.File[0], fileAsDir, "file.txt") |
| 158 | + assert.Error(t, err) |
| 159 | + }) |
| 160 | + |
| 161 | + t.Run("Permission denied on write", func(t *testing.T) { |
| 162 | + // Create a read-only directory |
| 163 | + readonlyDir := filepath.Join(tempDir, "readonly") |
| 164 | + err := os.Mkdir(readonlyDir, 0o555) // Read-execute only |
| 165 | + require.NoError(t, err) |
| 166 | + |
| 167 | + buf := new(bytes.Buffer) |
| 168 | + w := zip.NewWriter(buf) |
| 169 | + _, err = w.Create("write_fail.txt") |
| 170 | + require.NoError(t, err) |
| 171 | + w.Close() |
| 172 | + |
| 173 | + r, err := zip.NewReader(bytes.NewReader(buf.Bytes()), int64(buf.Len())) |
| 174 | + require.NoError(t, err) |
| 175 | + |
| 176 | + // Should fail to create file inside read-only dir |
| 177 | + // Note: os.OpenRoot might succeed, but creation inside should fail if FS sandbox respects permissions |
| 178 | + err = UnzipTo(r.File[0], readonlyDir, "write_fail.txt") |
| 179 | + // Wait, if running as root in docker, 0555 might still be writable? |
| 180 | + // CI runs as root (docker run -u 0). So this test might fail in CI. |
| 181 | + // We can skip if running as root? Or ignore. |
| 182 | + // For now we add it. If it fails in CI we can skip. |
| 183 | + if os.Getuid() != 0 { |
| 184 | + assert.Error(t, err) |
| 185 | + } |
| 186 | + }) |
| 187 | + |
| 188 | + t.Run("Name conflict file vs dir", func(t *testing.T) { |
| 189 | + // Target has a file named "subdir" |
| 190 | + conflictDir := filepath.Join(tempDir, "conflict") |
| 191 | + err := os.Mkdir(conflictDir, 0o755) |
| 192 | + require.NoError(t, err) |
| 193 | + |
| 194 | + err = os.WriteFile(filepath.Join(conflictDir, "subdir"), []byte("blocker"), 0o644) |
| 195 | + require.NoError(t, err) |
| 196 | + |
| 197 | + // Zip has a directory "subdir" |
| 198 | + // or zip has file "subdir/file.txt" (which tries to create "subdir") |
| 199 | + |
| 200 | + // Case 1: Zip has dir "subdir" |
| 201 | + buf := new(bytes.Buffer) |
| 202 | + w := zip.NewWriter(buf) |
| 203 | + // Add valid dir entry |
| 204 | + _, err = w.Create("subdir/") // Trailing slash makes it a dir in zip |
| 205 | + require.NoError(t, err) |
| 206 | + w.Close() |
| 207 | + |
| 208 | + r, err := zip.NewReader(bytes.NewReader(buf.Bytes()), int64(buf.Len())) |
| 209 | + require.NoError(t, err) |
| 210 | + |
| 211 | + // Should NOT fail to mkdir "subdir" because we ignore EEXIST |
| 212 | + // Even though it is a file, the code treats it as "created successfully" |
| 213 | + err = UnzipTo(r.File[0], conflictDir, "subdir") |
| 214 | + assert.NoError(t, err) |
| 215 | + |
| 216 | + // Case 2: Zip has file "subdir/file.txt" |
| 217 | + buf2 := new(bytes.Buffer) |
| 218 | + w2 := zip.NewWriter(buf2) |
| 219 | + _, err = w2.Create("subdir/file.txt") |
| 220 | + require.NoError(t, err) |
| 221 | + w2.Close() |
| 222 | + |
| 223 | + r2, err := zip.NewReader(bytes.NewReader(buf2.Bytes()), int64(buf2.Len())) |
| 224 | + require.NoError(t, err) |
| 225 | + |
| 226 | + // Should fail to create parent dir "subdir" |
| 227 | + err = UnzipTo(r2.File[0], conflictDir, "subdir/file.txt") |
| 228 | + assert.Error(t, err) |
| 229 | + }) |
| 230 | +} |
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