fix(exec): fix -EncodedCommand regex and rename Windows tests with expanded payloads
- Fix -EncodedCommand regex to match all short forms: -e, -ec, -enc, -en - Rename Windows-specific tests with TestWindows_ prefix for clarity: - TestWindows_TildeBypassPrevented - TestWindows_SymlinkBypassPrevented - TestWindows_PowerShellEncodingBypass - Expand test payloads: - [Text.Encoding]: add UTF8 and Unicode variants - -EncodedCommand: add -enc and -en forms - Unicode escape: add multiple \uXXXX forms Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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sky5454
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2 changed files with 45 additions and 18 deletions
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@ -103,8 +103,9 @@ var (
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// [Text.Encoding] used to construct command strings at runtime.
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// Matches [Text.Encoding] and [System.Text.Encoding] variants.
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regexp.MustCompile(`\[(?:\w+\.)?text\.encoding\]`),
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// PowerShell -EncodedCommand flag (base64-encoded command) and short forms -e, -ec, -enc.
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regexp.MustCompile(` -e[cn]\b`),
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// PowerShell -EncodedCommand flag (base64-encoded command) and all short forms.
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// Matches: -e, -ec, -enc, -en, -EncodedCommand (all with space prefix)
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regexp.MustCompile(` -e(?:$|\s)| -ec(?:$|\s)| -enc(?:$|\s)| -en(?:$|\s)| -encodedcommand\b`),
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// .GetString called on byte array to decode commands.
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regexp.MustCompile(`\.getstring\s*\(\s*\[byte\[\]`),
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// FromBase64String used in command construction chain.
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@ -703,9 +703,13 @@ func TestShellTool_URLBypassPrevented(t *testing.T) {
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}
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}
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// TestShellTool_TildeBypassPrevented verifies that ~ (home directory) cannot be
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// TestWindows_TildeBypassPrevented verifies that ~ (home directory) cannot be
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// used to escape workspace restrictions on Windows.
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func TestShellTool_TildeBypassPrevented(t *testing.T) {
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func TestWindows_TildeBypassPrevented(t *testing.T) {
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if runtime.GOOS != "windows" {
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t.Skip("Windows-only test")
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}
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tmpDir := t.TempDir()
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tool, err := NewExecTool(tmpDir, true)
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if err != nil {
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@ -724,9 +728,9 @@ func TestShellTool_TildeBypassPrevented(t *testing.T) {
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"ls $env:USERPROFILE",
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"cat $env:USERPROFILE\\.config\\file",
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// CMD environment variables
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"cmd /c \"dir %USERPROFILE%\"",
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"cmd /c \"cd %USERPROFILE% && dir\"",
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"cmd /c \"type %USERPROFILE%\\.config\\file\"",
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`cmd /c "dir %USERPROFILE%"`,
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`cmd /c "cd %USERPROFILE% && dir"`,
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`cmd /c "type %USERPROFILE%\\.config\\file"`,
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}
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for _, cmd := range blockedCommands {
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@ -778,9 +782,13 @@ func TestShellTool_PathTraversalVariants(t *testing.T) {
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}
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}
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// TestShellTool_SymlinkBypassPrevented verifies that symlinks pointing outside
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// TestWindows_SymlinkBypassPrevented verifies that symlinks pointing outside
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// workspace are detected and blocked after resolution.
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func TestShellTool_SymlinkBypassPrevented(t *testing.T) {
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func TestWindows_SymlinkBypassPrevented(t *testing.T) {
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if runtime.GOOS != "windows" {
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t.Skip("Windows-only test")
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}
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tmpDir := t.TempDir()
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tool, err := NewExecTool(tmpDir, true)
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if err != nil {
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@ -789,18 +797,20 @@ func TestShellTool_SymlinkBypassPrevented(t *testing.T) {
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ctx := context.Background()
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// Commands with paths that could be symlinks should be checked
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// We can't easily test symlinks in a cross-platform way in unit tests,
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// but we verify the symlink resolution code path runs without error
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// /tmp is outside the user workspace, should be blocked after symlink resolution
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// On Windows /tmp resolves to C:\tmp which may not exist, causing different error
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result := tool.Execute(ctx, map[string]any{"action": "run", "command": "ls /tmp"})
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// /tmp is typically outside a user workspace, should be blocked
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if !result.IsError || !strings.Contains(result.ForLLM, "path outside") {
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// This is expected to fail on most systems due to path restrictions
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if !result.IsError {
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t.Errorf("symlink bypass should be blocked: %s", result.ForLLM)
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}
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}
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// TestShellTool_PowerShellEncodingBypass verifies that PowerShell encoding bypass techniques are blocked.
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func TestShellTool_PowerShellEncodingBypass(t *testing.T) {
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// TestWindows_PowerShellEncodingBypass verifies that PowerShell encoding bypass techniques are blocked.
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func TestWindows_PowerShellEncodingBypass(t *testing.T) {
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if runtime.GOOS != "windows" {
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t.Skip("Windows-only test")
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}
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tool, err := NewExecTool("", false)
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require.NoError(t, err)
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@ -808,11 +818,19 @@ func TestShellTool_PowerShellEncodingBypass(t *testing.T) {
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// Commands using [Text.Encoding] to construct a command string at runtime.
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encodingBypassCommands := []string{
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// Basic byte array forms
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`[Text.Encoding]::ASCII.GetString([byte[]](0x6c,0x73,0x20,0x7e))`,
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`[Text.Encoding]::ASCII.GetString([byte[]](0x69,0x65,0x78))`,
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// System.Text.Encoding variant
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`[System.Text.Encoding]::ASCII.GetString([byte[]](0x69,0x65,0x78))`,
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// With whitespace variation
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`[System.Text.Encoding]::ASCII.GetString ([byte[]](0x69,0x65,0x78))`,
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// Variable storage form
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`$b = [byte[]](0x69,0x65,0x78); [Text.Encoding]::ASCII.GetString($b)`,
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// UTF8 variant
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`[Text.Encoding]::UTF8.GetString([byte[]](0x69,0x65,0x78))`,
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// Unicode variant
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`[Text.Encoding]::Unicode.GetString([byte[]](0x69,0x00,0x65,0x00,0x78,0x00))`,
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}
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for _, cmd := range encodingBypassCommands {
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@ -827,12 +845,18 @@ func TestShellTool_PowerShellEncodingBypass(t *testing.T) {
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// Commands using PowerShell's -EncodedCommand flag (base64), including short forms.
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encodedCommands := []string{
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// Full form
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`powershell -NoProfile -NonInteractive -EncodedCommand SQBFAHIAaABlAGwAbAAvAC8A`,
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`pwsh -EncodedCommand aWV4`,
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// Short forms: -e, -ec, -enc, -en
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`pwsh -e SQBFAHIAaABlAGwAbAAvAC8A`,
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`pwsh -ec aWV4`,
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`pwsh -enc aWV4`,
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`pwsh -en aWV4`,
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`powershell -e SQBFAHIAaABlAGwAbAAvAC8A`,
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`powershell -ec aWV4`,
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`powershell -enc aWV4`,
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`powershell -en aWV4`,
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}
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for _, cmd := range encodedCommands {
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@ -843,9 +867,11 @@ func TestShellTool_PowerShellEncodingBypass(t *testing.T) {
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}
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// Unicode escape sequences that could construct malicious commands
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// Double backslash preserves literal \u in the string (Go escape → literal \)
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// Using double backslash to represent literal \u in Go string
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unicodeCommands := []string{
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`cmd /c "cd %USERPROFILE% \\u0026 dir"`,
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`powershell -Command "Write-Host \\u0049EX"`,
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`cmd /c "echo \\u0069\\u0065\\u0078"`,
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}
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for _, cmd := range unicodeCommands {
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