chore: import upstream snapshot with attribution
This commit is contained in:
wehub-resource-sync
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#!/usr/bin/env python3
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"""
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s03_permission.py - Permission System
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Three gates inserted before tool execution:
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Gate 1: Hard deny list (rm -rf /, sudo, ...)
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Gate 2: Rule matching (write outside workspace? destructive cmd?)
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Gate 3: User approval (pause and wait for confirmation)
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+-------+ +--------+ +--------+ +--------+ +------+
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| Tool | -> | Gate 1 | -> | Gate 2 | -> | Gate 3 | -> | Exec |
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| call | | deny? | | match? | | allow? | | |
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+-------+ +--------+ +--------+ +--------+ +------+
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| | | |
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v v v v
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(normal) (blocked) (ask user) (user says no?)
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Only one line added to the agent loop:
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if not check_permission(block):
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continue
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Builds on s02 (multi-tool). Usage:
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python s03_permission/code.py
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Needs: pip install anthropic python-dotenv + ANTHROPIC_API_KEY in .env
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"""
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import os, subprocess
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from pathlib import Path
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try:
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import readline
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readline.parse_and_bind('set bind-tty-special-chars off')
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readline.parse_and_bind('set input-meta on')
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readline.parse_and_bind('set output-meta on')
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readline.parse_and_bind('set convert-meta off')
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except ImportError:
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pass
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from anthropic import Anthropic
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from dotenv import load_dotenv
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load_dotenv(override=True)
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if os.getenv("ANTHROPIC_BASE_URL"):
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os.environ.pop("ANTHROPIC_AUTH_TOKEN", None)
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WORKDIR = Path.cwd()
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client = Anthropic(base_url=os.getenv("ANTHROPIC_BASE_URL"))
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MODEL = os.environ["MODEL_ID"]
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SYSTEM = f"You are a coding agent at {WORKDIR}. All destructive operations require user approval."
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# ═══════════════════════════════════════════════════════════
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# FROM s02 (unchanged): Tool Implementations
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# ═══════════════════════════════════════════════════════════
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def safe_path(p: str) -> Path:
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path = (WORKDIR / p).resolve()
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if not path.is_relative_to(WORKDIR):
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raise ValueError(f"Path escapes workspace: {p}")
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return path
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def run_bash(command: str) -> str:
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try:
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r = subprocess.run(command, shell=True, cwd=WORKDIR,
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capture_output=True, text=True, timeout=120)
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out = (r.stdout + r.stderr).strip()
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return out[:50000] if out else "(no output)"
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except subprocess.TimeoutExpired:
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return "Error: Timeout (120s)"
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def run_read(path: str, limit: int | None = None) -> str:
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try:
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lines = safe_path(path).read_text().splitlines()
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if limit and limit < len(lines):
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lines = lines[:limit] + [f"... ({len(lines) - limit} more lines)"]
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return "\n".join(lines)
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except Exception as e:
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return f"Error: {e}"
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def run_write(path: str, content: str) -> str:
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try:
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file_path = safe_path(path)
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file_path.parent.mkdir(parents=True, exist_ok=True)
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file_path.write_text(content)
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return f"Wrote {len(content)} bytes to {path}"
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except Exception as e:
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return f"Error: {e}"
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def run_edit(path: str, old_text: str, new_text: str) -> str:
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try:
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file_path = safe_path(path)
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text = file_path.read_text()
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if old_text not in text:
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return f"Error: text not found in {path}"
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file_path.write_text(text.replace(old_text, new_text, 1))
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return f"Edited {path}"
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except Exception as e:
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return f"Error: {e}"
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def run_glob(pattern: str) -> str:
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import glob as g
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try:
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results = []
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for match in g.glob(pattern, root_dir=WORKDIR):
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if (WORKDIR / match).resolve().is_relative_to(WORKDIR):
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results.append(match)
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return "\n".join(results) if results else "(no matches)"
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except Exception as e:
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return f"Error: {e}"
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# ═══════════════════════════════════════════════════════════
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# FROM s02 (unchanged): Tool Definitions & Dispatch
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# ═══════════════════════════════════════════════════════════
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TOOLS = [
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{"name": "bash", "description": "Run a shell command.",
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"input_schema": {"type": "object", "properties": {"command": {"type": "string"}}, "required": ["command"]}},
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{"name": "read_file", "description": "Read file contents.",
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"input_schema": {"type": "object", "properties": {"path": {"type": "string"}, "limit": {"type": "integer"}}, "required": ["path"]}},
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{"name": "write_file", "description": "Write content to a file.",
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"input_schema": {"type": "object", "properties": {"path": {"type": "string"}, "content": {"type": "string"}}, "required": ["path", "content"]}},
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{"name": "edit_file", "description": "Replace exact text in a file once.",
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"input_schema": {"type": "object", "properties": {"path": {"type": "string"}, "old_text": {"type": "string"}, "new_text": {"type": "string"}}, "required": ["path", "old_text", "new_text"]}},
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{"name": "glob", "description": "Find files matching a glob pattern.",
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"input_schema": {"type": "object", "properties": {"pattern": {"type": "string"}}, "required": ["pattern"]}},
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]
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TOOL_HANDLERS = {
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"bash": run_bash, "read_file": run_read, "write_file": run_write,
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"edit_file": run_edit, "glob": run_glob,
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}
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# ═══════════════════════════════════════════════════════════
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# NEW in s03: Three-Gate Permission Pipeline
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# ═══════════════════════════════════════════════════════════
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# Gate 1: Hard deny list — always forbidden
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DENY_LIST = ["rm -rf /", "sudo", "shutdown", "reboot", "mkfs", "dd if=", "> /dev/sda"]
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def check_deny_list(command: str) -> str | None:
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for pattern in DENY_LIST:
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if pattern in command:
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return f"Blocked: '{pattern}' is on the deny list"
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return None
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# Gate 2: Rule matching — context-dependent checks
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PERMISSION_RULES = [
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{"tools": ["write_file", "edit_file"],
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"check": lambda args: not (WORKDIR / args.get("path", "")).resolve().is_relative_to(WORKDIR),
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"message": "Writing outside workspace"},
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{"tools": ["bash"],
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"check": lambda args: any(kw in args.get("command", "") for kw in ["rm ", "> /etc/", "chmod 777"]),
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"message": "Potentially destructive command"},
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]
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def check_rules(tool_name: str, args: dict) -> str | None:
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for rule in PERMISSION_RULES:
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if tool_name in rule["tools"] and rule["check"](args):
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return rule["message"]
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return None
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# Gate 3: User approval — wait for confirmation after rule match
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def ask_user(tool_name: str, args: dict, reason: str) -> str:
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print(f"\n\033[33m⚠ {reason}\033[0m")
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print(f" Tool: {tool_name}({args})")
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choice = input(" Allow? [y/N] ").strip().lower()
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return "allow" if choice in ("y", "yes") else "deny"
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# Pipeline: all three gates chained
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def check_permission(block) -> bool:
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if block.name == "bash":
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reason = check_deny_list(block.input.get("command", ""))
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if reason:
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print(f"\n\033[31m⛔ {reason}\033[0m")
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return False
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reason = check_rules(block.name, block.input)
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if reason:
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decision = ask_user(block.name, block.input, reason)
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if decision == "deny":
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return False
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return True
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# ═══════════════════════════════════════════════════════════
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# agent_loop — same as s02, with check_permission() inserted
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# ═══════════════════════════════════════════════════════════
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def agent_loop(messages: list):
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while True:
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response = client.messages.create(
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model=MODEL, system=SYSTEM, messages=messages,
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tools=TOOLS, max_tokens=8000,
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)
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messages.append({"role": "assistant", "content": response.content})
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if response.stop_reason != "tool_use":
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return
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results = []
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for block in response.content:
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if block.type != "tool_use":
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continue
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print(f"\033[36m> {block.name}\033[0m")
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# s03 change: run through permission pipeline before executing
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if not check_permission(block):
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results.append({"type": "tool_result", "tool_use_id": block.id,
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"content": "Permission denied."})
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continue
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handler = TOOL_HANDLERS.get(block.name)
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output = handler(**block.input) if handler else f"Unknown: {block.name}"
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print(str(output)[:200])
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results.append({"type": "tool_result", "tool_use_id": block.id, "content": output})
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messages.append({"role": "user", "content": results})
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if __name__ == "__main__":
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print("s03: Permission")
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print("输入问题，回车发送。输入 q 退出。\n")
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history = []
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while True:
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try:
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query = input("\033[36ms03 >> \033[0m")
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except (EOFError, KeyboardInterrupt):
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break
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if query.strip().lower() in ("q", "exit", ""):
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break
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history.append({"role": "user", "content": query})
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agent_loop(history)
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for block in history[-1]["content"]:
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if getattr(block, "type", None) == "text":
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print(block.text)
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print()
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