shuiyu1123
161ab9d3a8
- 新增 mcp_server.py: 标准 MCP stdio 传输层入口 - TUI: 回车发送消息，Shift+回车换行 (SendTextArea子类) - 子Agent: 移除 max_steps=20 限制 - 安全引擎: 移除 ALWAYS_CONFIRM 关键词强制拦截 - code_editor: diff弹窗绿底(+)/红底(-)背景色
272 lines
9.3 KiB
Python
272 lines
9.3 KiB
Python
"""
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安全层 - 统一的指令安全检查
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拦截所有工具调用，通过 AI 识别风险并请求用户确认
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"""
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import json
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import threading
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from typing import Optional, Tuple
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# ── 安全模式 ──
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MODE_UNRESTRICTED = 0 # 无限制：直接执行
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MODE_NORMAL = 1 # 普通：AI 识别风险
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MODE_MANUAL = 2 # 人工：所有指令都确认
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MODE_NAMES = {
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MODE_UNRESTRICTED: "无限制",
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MODE_NORMAL: "普通",
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MODE_MANUAL: "人工确认",
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}
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class SafetyLayer:
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"""统一安全检查层"""
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def __init__(self):
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self.mode = MODE_NORMAL
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self.cli = None
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self._analysis_cache = {} # 缓存分析结果
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self._lock = threading.Lock()
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def set_cli(self, cli):
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self.cli = cli
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def get_mode(self) -> int:
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return self.mode
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def get_mode_name(self) -> str:
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return MODE_NAMES.get(self.mode, "未知")
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def set_mode(self, mode: int):
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self.mode = mode
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def cycle_mode(self) -> str:
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"""切换到下一个模式，返回新模式名称"""
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self.mode = (self.mode + 1) % 3
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return self.get_mode_name()
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# ── 核心：拦截检查 ──
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def check(self, tool_name: str, tool_args: str) -> Tuple[bool, str]:
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"""
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检查工具调用是否安全
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返回: (允许执行, 消息)
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"""
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# 无限制模式：直接放行
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if self.mode == MODE_UNRESTRICTED:
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return True, ""
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# 人工确认模式：所有指令都确认
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if self.mode == MODE_MANUAL:
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return self._ask_user_confirm(
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tool_name, tool_args,
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risk_level="中",
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impact="当前为人工确认模式，所有指令需要确认",
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reason="模式要求"
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)
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# 普通模式：AI 识别风险
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return self._ai_analyze(tool_name, tool_args)
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# ── AI 风险识别 ──
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def _ai_analyze(self, tool_name: str, tool_args: str) -> Tuple[bool, str]:
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"""使用当前引擎独立分析指令风险（不带历史对话）"""
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# 快速预检：明显安全的指令直接放行
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if self._is_quick_safe(tool_name, tool_args):
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return True, ""
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# 获取引擎
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engine = None
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if self.cli and hasattr(self.cli, 'current_engine'):
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engine = self.cli.current_engine
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if not engine:
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# 无引擎时降级为人工确认
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return self._ask_user_confirm(
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tool_name, tool_args,
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risk_level="未知",
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impact="无法进行 AI 风险分析",
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reason="无可用引擎"
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)
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# 检查缓存
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cache_key = f"{tool_name}:{tool_args[:100]}"
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with self._lock:
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if cache_key in self._analysis_cache:
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cached = self._analysis_cache[cache_key]
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if cached["safe"]:
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return True, ""
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return self._ask_user_confirm(
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tool_name, tool_args,
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risk_level=cached["level"],
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impact=cached["impact"],
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reason=cached["reason"]
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)
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# 调用 AI 独立分析（不带任何历史对话）
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analysis_prompt = f"""你是一个安全分析器。分析以下工具调用是否存在安全风险。
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工具: {tool_name}
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参数: {tool_args}
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只返回以下 JSON（不要其他内容）:
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{{"safe": true/false, "level": "低/中/高", "reason": "风险原因", "impact": "执行后可能的影响"}}
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判断标准:
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- safe=true: 读取操作、查看信息、无害查询
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- safe=false: 删除文件、执行系统命令、修改配置、网络请求、git 危险操作
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- level 低: 只读操作但可能泄露信息
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- level 中: 修改操作可撤销
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- level 高: 不可逆操作、系统级操作"""
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try:
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response = engine.generate_response(analysis_prompt, system_prompt="你是安全分析器。只返回 JSON，不要其他内容。")
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if not response:
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return self._ask_user_confirm(
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tool_name, tool_args,
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risk_level="未知",
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impact="AI 分析无响应",
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reason="引擎未返回结果"
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)
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# 解析 JSON
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result = self._parse_analysis(response)
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if result and result.get("safe") is True:
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# 缓存安全结果
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with self._lock:
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self._analysis_cache[cache_key] = result
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return True, ""
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# 不安全，请求用户确认
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level = result.get("level", "中") if result else "未知"
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reason = result.get("reason", "AI 识别到潜在风险") if result else "AI 分析失败"
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impact = result.get("impact", "未知影响") if result else "未知影响"
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return self._ask_user_confirm(
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tool_name, tool_args,
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risk_level=level,
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impact=impact,
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reason=reason
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)
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except Exception as e:
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return self._ask_user_confirm(
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tool_name, tool_args,
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risk_level="未知",
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impact=f"AI 分析异常: {e}",
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reason="分析过程出错"
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)
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def _parse_analysis(self, response: str) -> Optional[dict]:
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"""解析 AI 返回的分析结果"""
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import re
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# 尝试直接解析 JSON
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response = response.strip()
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# 去掉 markdown 代码块
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if response.startswith("```"):
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response = response.split("\n", 1)[-1] if "\n" in response else response[3:]
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if response.endswith("```"):
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response = response[:-3]
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response = response.strip()
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try:
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return json.loads(response)
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except json.JSONDecodeError:
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pass
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# 尝试从文本中提取 JSON
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match = re.search(r'\{[^{}]*"safe"[^{}]*\}', response)
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if match:
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try:
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return json.loads(match.group())
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except json.JSONDecodeError:
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pass
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return None
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def _is_quick_safe(self, tool_name: str, tool_args: str) -> bool:
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"""快速预检：明显安全的操作直接放行"""
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args = tool_args.strip().lower()
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# 纯读取操作
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safe_patterns = {
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"code_editor": ["read_range", "find ", "regex ", "symbols", "imports",
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"ast_info", "stats", "structure", "context", "todo",
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"callers", "diff ", "diff_text"],
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"git_tools": ["status", "log", "diff", "branch", "remote", "show",
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"blame", "contributors", "summary"],
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"file_manager": ["list", "read", "info", "search"],
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"cmd_executor": [], # 命令执行不跳过
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"auto_engineer": ["metrics", "security", "complexity", "duplicates",
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"suggest", "info"],
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"task_manager": ["list"],
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"browser_auto": ["status", "title", "url", "text", "html", "attr",
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"value", "eval", "query", "cookies"],
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"sub_agent": ["list", "status", "result", "stats"],
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"network_tools": ["ping", "status", "headers", "ip"],
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"tool_search": [],
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}
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patterns = safe_patterns.get(tool_name, [])
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for p in patterns:
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if args.startswith(p):
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return True
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return False
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# ── 用户交互 ──
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def _ask_user_confirm(self, tool_name: str, tool_args: str,
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risk_level: str = "中", impact: str = "",
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reason: str = "") -> Tuple[bool, str]:
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"""向用户展示风险信息并请求确认"""
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from colorama import Fore, Style
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# 风险等级颜色
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level_colors = {
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"低": Fore.YELLOW,
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"中": Fore.LIGHTYELLOW_EX,
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"高": Fore.RED,
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"未知": Fore.LIGHTBLACK_EX,
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}
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level_color = level_colors.get(risk_level, Fore.YELLOW)
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# 截断过长的参数
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display_args = tool_args
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if len(display_args) > 200:
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display_args = display_args[:200] + "..."
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print()
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print(f" {Fore.RED}{'═' * 50}{Style.RESET_ALL}")
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print(f" {Fore.RED} 安全检查{Style.RESET_ALL}")
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print(f" {Fore.RED}{'═' * 50}{Style.RESET_ALL}")
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print(f" {Fore.CYAN}工具:{Style.RESET_ALL} {tool_name}")
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print(f" {Fore.CYAN}指令:{Style.RESET_ALL} {display_args}")
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print(f" {level_color}风险:{Style.RESET_ALL} {risk_level}")
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if reason:
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print(f" {Fore.YELLOW}原因:{Style.RESET_ALL} {reason}")
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if impact:
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print(f" {Fore.YELLOW}影响:{Style.RESET_ALL} {impact}")
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print(f" {Fore.RED}{'─' * 50}{Style.RESET_ALL}")
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try:
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choice = input(f" {Fore.WHITE}是否执行? (y/n): {Style.RESET_ALL}").strip().lower()
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if choice in ('y', 'yes', '是'):
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return True, "用户确认执行"
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else:
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return False, "用户取消执行"
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except (KeyboardInterrupt, EOFError):
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print()
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return False, "用户中断"
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# ── 全局单例 ──
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_safety = SafetyLayer()
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def get_safety() -> SafetyLayer:
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return _safety
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