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AI应用的API安全：从认证到授权的完整指南

news 2026/5/30 16:32:43

AI应用的API安全：从认证到授权的完整指南

前言

我们的 API 曾经被恶意调用，导致服务不可用。后来我们建立了完整的 API 安全体系。

今天，分享我们是如何保护 API 的。

一、API 安全威胁

1.1 威胁类型

class APIThreats: THREATS = { "authentication": {"description": "认证绕过", "severity": "high"}, "authorization": {"description": "越权访问", "severity": "high"}, "rate_limiting": {"description": "API 滥用", "severity": "medium"}, "injection": {"description": "注入攻击", "severity": "high"} }

1.2 攻击向量

class AttackVectors: VECTORS = { "brute_force": {"description": "暴力破解"}, "credential_stuffing": {"description": "凭证填充"}, "man_in_the_middle": {"description": "中间人攻击"}, "cross_site_request_forgery": {"description": "CSRF"} }

二、认证机制

2.1 JWT 认证

class JWTAuthentication: def authenticate(self, token: str) -> dict: """JWT 认证""" import jwt try: payload = jwt.decode(token, "secret", algorithms=["HS256"]) return {"user_id": payload["sub"], "valid": True} except jwt.InvalidTokenError: return {"valid": False}

2.2 API Key 认证

class APIKeyAuthentication: def authenticate(self, api_key: str) -> dict: """API Key 认证""" valid_keys = ["valid_key_1", "valid_key_2"] return {"valid": api_key in valid_keys}

三、授权机制

3.1 RBAC

class RBACAuthorization: def authorize(self, user_id: str, resource: str, action: str) -> bool: """基于角色的访问控制""" roles = { "admin": {"permissions": ["*"]}, "user": {"permissions": ["read", "create"]} } role = self._get_role(user_id) return action in roles.get(role, {}).get("permissions", [])

3.2 ABAC

class ABACAuthorization: def authorize(self, user: dict, resource: dict, action: str) -> bool: """基于属性的访问控制""" return user["department"] == resource["department"]

四、安全防护

4.1 限流

class RateLimiting: def __init__(self): self.limits = {"standard": 100, "premium": 1000} def check(self, user_id: str, plan: str) -> bool: """检查限流""" current = self._get_request_count(user_id) return current < self.limits.get(plan, 100)

4.2 输入验证

class InputValidation: def validate(self, input_data: dict) -> dict: """验证输入""" checks = [ {"name": "required_fields", "passed": "email" in input_data}, {"name": "email_format", "passed": self._is_valid_email(input_data.get("email"))} ] return {"valid": all(c["passed"] for c in checks), "checks": checks}

五、安全监控

5.1 异常检测

class AnomalyDetection: def detect(self, request: dict) -> dict: """检测异常""" anomalies = [] if request["frequency"] > 100: anomalies.append("请求频率异常") return {"anomalies": anomalies, "risk_level": "high" if anomalies else "low"}

5.2 审计日志

class AuditLogging: def log(self, event: dict) -> dict: """记录审计日志""" return { "event": event["type"], "user_id": event["user_id"], "timestamp": datetime.now().isoformat(), "details": event["details"] }