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298 lines (260 loc) · 9.22 KB
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from __future__ import annotations
import ast
from datetime import datetime, timezone
import hashlib
from importlib.metadata import PackageNotFoundError, version
import json
import platform
from pathlib import Path
from typing import Any
SENSITIVE_IMPORTS = {
"ctypes",
"marshal",
"mmap",
"pickle",
"socket",
"subprocess",
"winreg",
}
SENSITIVE_CALLS = {
"__import__",
"compile",
"eval",
"exec",
"marshal.loads",
"os.execl",
"os.execle",
"os.execlp",
"os.execlpe",
"os.execv",
"os.execve",
"os.execvp",
"os.execvpe",
"os.popen",
"os.spawnl",
"os.spawnle",
"os.spawnlp",
"os.spawnlpe",
"os.spawnv",
"os.spawnve",
"os.spawnvp",
"os.spawnvpe",
"os.system",
"pickle.loads",
"subprocess.call",
"subprocess.check_call",
"subprocess.check_output",
"subprocess.Popen",
"subprocess.run",
}
def sha256_text(value: str) -> str:
return hashlib.sha256(value.encode("utf-8")).hexdigest()
def sha256_file(path: str | Path) -> str:
digest = hashlib.sha256()
with Path(path).open("rb") as handle:
for chunk in iter(lambda: handle.read(1024 * 1024), b""):
digest.update(chunk)
return digest.hexdigest()
def sha256_text_file(path: str | Path) -> str:
return sha256_text(Path(path).read_text(encoding="utf-8"))
def _utc_now() -> str:
return datetime.now(timezone.utc).isoformat().replace("+00:00", "Z")
def _tool_version() -> str:
try:
return version("patchwork")
except PackageNotFoundError:
return "0.5.0"
def _call_name(node: ast.AST) -> str | None:
if isinstance(node, ast.Name):
return node.id
if isinstance(node, ast.Attribute):
parent = _call_name(node.value)
if parent:
return f"{parent}.{node.attr}"
return node.attr
return None
class AuditVisitor(ast.NodeVisitor):
def __init__(self) -> None:
self.imports: set[str] = set()
self.functions: list[str] = []
self.classes: list[str] = []
self.review_indicators: list[dict[str, object]] = []
self.node_count = 0
def generic_visit(self, node: ast.AST) -> None:
self.node_count += 1
super().generic_visit(node)
def visit_Import(self, node: ast.Import) -> None:
for alias in node.names:
top_level = alias.name.split(".", 1)[0]
self.imports.add(alias.name)
if top_level in SENSITIVE_IMPORTS:
self.review_indicators.append(
{
"kind": "import",
"name": alias.name,
"line": node.lineno,
"reason": "sensitive standard-library capability",
}
)
self.generic_visit(node)
def visit_ImportFrom(self, node: ast.ImportFrom) -> None:
module = node.module or ""
if module:
self.imports.add(module)
top_level = module.split(".", 1)[0]
if top_level in SENSITIVE_IMPORTS:
self.review_indicators.append(
{
"kind": "import",
"name": module,
"line": node.lineno,
"reason": "sensitive standard-library capability",
}
)
self.generic_visit(node)
def visit_FunctionDef(self, node: ast.FunctionDef) -> None:
self.functions.append(node.name)
self.generic_visit(node)
def visit_AsyncFunctionDef(self, node: ast.AsyncFunctionDef) -> None:
self.functions.append(node.name)
self.generic_visit(node)
def visit_ClassDef(self, node: ast.ClassDef) -> None:
self.classes.append(node.name)
self.generic_visit(node)
def visit_Call(self, node: ast.Call) -> None:
name = _call_name(node.func)
if name in SENSITIVE_CALLS:
self.review_indicators.append(
{
"kind": "call",
"name": name,
"line": node.lineno,
"reason": "dynamic execution or process capability",
}
)
self.generic_visit(node)
def analyze_source(source: str, *, path: str | Path | None = None) -> dict[str, Any]:
tree = ast.parse(source, filename=str(path or "<memory>"))
visitor = AuditVisitor()
visitor.visit(tree)
review_indicators = sorted(visitor.review_indicators, key=lambda item: (int(item["line"]), str(item["name"])))
return {
"path": str(path) if path else None,
"sha256": sha256_text(source),
"lines": source.count("\n") + (1 if source else 0),
"bytes_utf8": len(source.encode("utf-8")),
"ast_nodes": visitor.node_count,
"imports": sorted(visitor.imports),
"functions": sorted(visitor.functions),
"classes": sorted(visitor.classes),
"review": {
"indicator_count": len(review_indicators),
"requires_human_review": bool(review_indicators),
"indicators": review_indicators,
},
}
def build_stats(input_source: str, output_source: str | None, audit: dict[str, Any]) -> dict[str, object]:
input_bytes = len(input_source.encode("utf-8"))
output_bytes = len(output_source.encode("utf-8")) if output_source is not None else None
return {
"input_bytes": input_bytes,
"output_bytes": output_bytes,
"ratio": round(output_bytes / max(input_bytes, 1), 4) if output_bytes is not None else None,
"input_lines": input_source.count("\n") + (1 if input_source else 0),
"output_lines": output_source.count("\n") + (1 if output_source else 0) if output_source is not None else None,
"input_sha256": sha256_text(input_source),
"output_sha256": sha256_text(output_source) if output_source is not None else None,
"review_indicator_count": audit.get("review", {}).get("indicator_count", 0),
}
def build_manifest(
*,
input_path: str | Path,
output_path: str | Path,
input_source: str,
output_source: str,
seed: int,
options: dict[str, object],
audit: dict[str, Any],
) -> dict[str, Any]:
return {
"schema": "patchwork.manifest.v1",
"generated_at": _utc_now(),
"tool": {
"name": "patchwork",
"version": _tool_version(),
"python": platform.python_version(),
"platform": platform.platform(),
},
"input": {
"path": str(input_path),
"sha256": sha256_text(input_source),
"bytes_utf8": len(input_source.encode("utf-8")),
},
"output": {
"path": str(output_path),
"sha256": sha256_text(output_source),
"bytes_utf8": len(output_source.encode("utf-8")),
},
"build": {
"cwd": str(Path.cwd()),
"seed": seed,
"options": options,
},
"stats": build_stats(input_source, output_source, audit),
"audit": audit,
}
def verify_manifest(path: str | Path) -> dict[str, Any]:
manifest_path = Path(path)
try:
manifest = json.loads(manifest_path.read_text(encoding="utf-8"))
except FileNotFoundError as exc:
raise ValueError(f"manifest file not found: {manifest_path}") from exc
except json.JSONDecodeError as exc:
raise ValueError(f"invalid manifest JSON: {exc}") from exc
if not isinstance(manifest, dict):
raise ValueError("manifest must contain a JSON object")
errors: list[str] = []
if manifest.get("schema") != "patchwork.manifest.v1":
errors.append("unsupported manifest schema")
build = manifest.get("build", {})
cwd = Path(build.get("cwd") or Path.cwd()) if isinstance(build, dict) else Path.cwd()
checks: dict[str, dict[str, object]] = {}
for section in ("input", "output"):
item = manifest.get(section, {})
if not isinstance(item, dict):
errors.append(f"{section} section missing or invalid")
continue
raw_path = item.get("path")
expected = item.get("sha256")
if not isinstance(raw_path, str) or not isinstance(expected, str):
errors.append(f"{section} path or sha256 missing")
continue
candidate = Path(raw_path)
if not candidate.is_absolute():
candidate = cwd / candidate
exists = candidate.exists()
try:
actual = sha256_text_file(candidate) if exists else None
except UnicodeDecodeError:
actual = None
ok = actual == expected
if not ok:
errors.append(f"{section} hash mismatch or file missing: {candidate}")
checks[section] = {
"path": str(candidate),
"exists": exists,
"expected_sha256": expected,
"actual_sha256": actual,
"ok": ok,
}
return {
"valid": not errors,
"errors": errors,
"checks": checks,
"manifest": str(manifest_path),
}
def write_json(path: str | Path, data: dict[str, Any]) -> Path:
output_path = Path(path)
output_path.parent.mkdir(parents=True, exist_ok=True)
output_path.write_text(json.dumps(data, indent=2, sort_keys=True) + "\n", encoding="utf-8")
return output_path
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