# coding=utf-8 import ast import base64 import gzip import json import os import socket import subprocess import sys import tempfile import pwd import resource import uuid_utils.compat as uuid from common.utils.logger import maxkb_logger from django.utils.translation import gettext_lazy as _ from maxkb.const import BASE_DIR, CONFIG from maxkb.const import PROJECT_DIR from textwrap import dedent python_directory = sys.executable class ToolExecutor: def __init__(self, sandbox=False): self.sandbox = sandbox if sandbox: self.sandbox_path = CONFIG.get("SANDBOX_HOME", '/opt/maxkb-app/sandbox') self.user = 'sandbox' else: self.sandbox_path = os.path.join(PROJECT_DIR, 'data', 'sandbox') self.user = None self.sandbox_so_path = f'{self.sandbox_path}/lib/sandbox.so' self.process_timeout_seconds = int(CONFIG.get("SANDBOX_PYTHON_PROCESS_TIMEOUT_SECONDS", '3600')) try: self._init_sandbox_dir() except Exception as e: # 本机忽略异常，容器内不忽略 maxkb_logger.error(f'Exception: {e}', exc_info=True) if self.sandbox: raise e def _init_sandbox_dir(self): if not self.sandbox: # 不是sandbox就不初始化目录 return try: # 只初始化一次 fd = os.open(os.path.join(PROJECT_DIR, 'tmp', 'tool_executor_init_dir.lock'), os.O_CREAT | os.O_EXCL | os.O_WRONLY) os.close(fd) except FileExistsError: # 文件已存在 → 已初始化过 return maxkb_logger.debug("init dir") try: os.system("chmod -R g-rwx /dev/shm /dev/mqueue") os.system("chmod o-rwx /run/postgresql") except Exception as e: maxkb_logger.warning(f'Exception: {e}', exc_info=True) pass if CONFIG.get("SANDBOX_TMP_DIR_ENABLED", '0') == "1": os.system("chmod g+rwx /tmp") # 初始化sandbox配置文件 sandbox_lib_path = os.path.dirname(self.sandbox_so_path) sandbox_conf_file_path = f'{sandbox_lib_path}/.sandbox.conf' if os.path.exists(sandbox_conf_file_path): os.remove(sandbox_conf_file_path) allow_subprocess = CONFIG.get("SANDBOX_PYTHON_ALLOW_SUBPROCESS", '0') banned_hosts = CONFIG.get("SANDBOX_PYTHON_BANNED_HOSTS", '').strip() if banned_hosts: hostname = socket.gethostname() local_ip = socket.gethostbyname(hostname) banned_hosts = f"{banned_hosts},{hostname},{local_ip}" with open(sandbox_conf_file_path, "w") as f: f.write(f"SANDBOX_PYTHON_BANNED_HOSTS={banned_hosts}\n") f.write(f"SANDBOX_PYTHON_ALLOW_SUBPROCESS={allow_subprocess}\n") os.system(f"chmod -R 550 {self.sandbox_path}") def exec_code(self, code_str, keywords, function_name=None): _id = str(uuid.uuid7()) success = '{"code":200,"msg":"成功","data":exec_result}' err = '{"code":500,"msg":str(e),"data":None}' action_function = f'({function_name !a}, locals_v.get({function_name !a}))' if function_name else 'locals_v.popitem()' python_paths = CONFIG.get_sandbox_python_package_paths().split(',') set_run_user = f'os.setgid({pwd.getpwnam(self.user).pw_gid});os.setuid({pwd.getpwnam(self.user).pw_uid});' if self.sandbox else '' _exec_code = f""" try: import os, sys, json, base64, builtins path_to_exclude = ['/opt/py3/lib/python3.11/site-packages', '/opt/maxkb-app/apps'] sys.path = [p for p in sys.path if p not in path_to_exclude] sys.path += {python_paths} locals_v={'{}'} keywords={keywords} globals_v={'{}'} {set_run_user} os.environ.clear() exec({dedent(code_str)!a}, globals_v, locals_v) f_name, f = {action_function} for local in locals_v: globals_v[local] = locals_v[local] exec_result=f(**keywords) builtins.print("\\n{_id}:"+base64.b64encode(json.dumps({success}, default=str).encode()).decode(), flush=True) except Exception as e: builtins.print("\\n{_id}:"+base64.b64encode(json.dumps({err}, default=str).encode()).decode(), flush=True) """ maxkb_logger.debug(f"Sandbox execute code: {_exec_code}") with tempfile.NamedTemporaryFile(mode='w', suffix='.py', delete=True) as f: f.write(_exec_code) f.flush() subprocess_result = self._exec(f.name) if subprocess_result.returncode != 0: raise Exception(subprocess_result.stderr or subprocess_result.stdout or "Unknown exception occurred") lines = subprocess_result.stdout.splitlines() result_line = [line for line in lines if line.startswith(_id)] if not result_line: maxkb_logger.error("\n".join(lines)) raise Exception("No result found.") result = json.loads(base64.b64decode(result_line[-1].split(":", 1)[1]).decode()) if result.get('code') == 200: return result.get('data') raise Exception(result.get('msg')) def _generate_mcp_server_code(self, _code, params): # 解析代码，提取导入语句和函数定义 try: tree = ast.parse(_code) except SyntaxError: return _code imports = [] functions = [] other_code = [] for node in tree.body: if isinstance(node, ast.Import) or isinstance(node, ast.ImportFrom): imports.append(ast.unparse(node)) elif isinstance(node, ast.FunctionDef): # 修改函数参数以包含 params 中的默认值 arg_names = [arg.arg for arg in node.args.args] # 为参数添加默认值，确保参数顺序正确 defaults = [] num_defaults = 0 # 从后往前检查哪些参数有默认值 for i, arg_name in enumerate(arg_names): if arg_name in params: num_defaults = len(arg_names) - i break # 为有默认值的参数创建默认值列表 if num_defaults > 0: for i in range(len(arg_names) - num_defaults, len(arg_names)): arg_name = arg_names[i] if arg_name in params: default_value = params[arg_name] if isinstance(default_value, str): defaults.append(ast.Constant(value=default_value)) elif isinstance(default_value, (int, float, bool)): defaults.append(ast.Constant(value=default_value)) elif default_value is None: defaults.append(ast.Constant(value=None)) else: defaults.append(ast.Constant(value=str(default_value))) else: # 如果某个参数没有默认值，需要添加 None 占位 defaults.append(ast.Constant(value=None)) node.args.defaults = defaults func_code = ast.unparse(node) functions.append(f"@mcp.tool()\n{func_code}\n") else: other_code.append(ast.unparse(node)) # 构建完整的 MCP 服务器代码 code_parts = ["from mcp.server.fastmcp import FastMCP"] code_parts.extend(imports) code_parts.append(f"\nmcp = FastMCP(\"{uuid.uuid7()}\")\n") code_parts.extend(other_code) code_parts.extend(functions) code_parts.append("\nmcp.run(transport=\"stdio\")\n") return "\n".join(code_parts) def generate_mcp_server_code(self, code_str, params): python_paths = CONFIG.get_sandbox_python_package_paths().split(',') code = self._generate_mcp_server_code(code_str, params) set_run_user = f'os.setgid({pwd.getpwnam(self.user).pw_gid});os.setuid({pwd.getpwnam(self.user).pw_uid});' if self.sandbox else '' return f""" import os, sys, logging logging.basicConfig(level=logging.WARNING) logging.getLogger("mcp").setLevel(logging.ERROR) logging.getLogger("mcp.server").setLevel(logging.ERROR) path_to_exclude = ['/opt/py3/lib/python3.11/site-packages', '/opt/maxkb-app/apps'] sys.path = [p for p in sys.path if p not in path_to_exclude] sys.path += {python_paths} {set_run_user} os.environ.clear() exec({dedent(code)!a}) """ def get_tool_mcp_config(self, code, params): _code = self.generate_mcp_server_code(code, params) maxkb_logger.debug(f"Python code of mcp tool: {_code}") compressed_and_base64_encoded_code_str = base64.b64encode(gzip.compress(_code.encode())).decode() tool_config = { 'command': sys.executable, 'args': [ '-c', f'import base64,gzip; exec(gzip.decompress(base64.b64decode(\'{compressed_and_base64_encoded_code_str}\')).decode())', ], 'cwd': self.sandbox_path, 'env': { 'LD_PRELOAD': self.sandbox_so_path, }, 'transport': 'stdio', } return tool_config def _exec(self, execute_file): kwargs = {'cwd': BASE_DIR, 'env': { 'LD_PRELOAD': self.sandbox_so_path, }} try: def set_resource_limit(): if not self.sandbox: return mem_limit = int(CONFIG.get("SANDBOX_PYTHON_PROCESS_LIMIT_MEM_MB", '128')) * 1024 * 1024 resource.setrlimit(resource.RLIMIT_RSS, (mem_limit, mem_limit)) subprocess_result = subprocess.run( [python_directory, execute_file], preexec_fn=set_resource_limit, timeout=self.process_timeout_seconds, text=True, capture_output=True, **kwargs) return subprocess_result except subprocess.TimeoutExpired: raise Exception(_(f"Process execution timed out after {self.process_timeout_seconds} seconds.")) def validate_mcp_transport(self, code_str): servers = json.loads(code_str) for server, config in servers.items(): if config.get('transport') not in ['sse', 'streamable_http']: raise Exception(_('Only support transport=sse or transport=streamable_http'))