python 编程实现基于包含主体、客体、环境集合的访问控制模型ABAC

下面是一个简单的 Python 实现 ABAC 模型的示例：

class Subject:
    def __init__(self, name, role=None):
        self.name = name
        self.role = role
        self.attributes = {}

    def add_attribute(self, name, value):
        self.attributes[name] = value

    def get_attribute(self, name):
        return self.attributes.get(name)


class Object:
    def __init__(self, name, obj_type=None):
        self.name = name
        self.obj_type = obj_type
        self.attributes = {}

    def add_attribute(self, name, value):
        self.attributes[name] = value

    def get_attribute(self, name):
        return self.attributes.get(name)


class Environment:
    def __init__(self):
        self.attributes = {}

    def add_attribute(self, name, value):
        self.attributes[name] = value

    def get_attribute(self, name):
        return self.attributes.get(name)


class Policy:
    def __init__(self, subject_attr, object_attr, environment_attr, decision):
        self.subject_attr = subject_attr
        self.object_attr = object_attr
        self.environment_attr = environment_attr
        self.decision = decision

    def evaluate(self, subject, obj, env):
        for attr, value in self.subject_attr.items():
            if subject.get_attribute(attr) != value:
                return False

        for attr, value in self.object_attr.items():
            if obj.get_attribute(attr) != value:
                return False

        for attr, value in self.environment_attr.items():
            if env.get_attribute(attr) != value:
                return False

        return self.decision


# 创建主体、客体和环境
subject = Subject("Alice", "admin")
subject.add_attribute("department", "IT")

obj = Object("Server1", "server")
obj.add_attribute("location", "datacenter")

env = Environment()
env.add_attribute("time", "10:00")

# 创建访问策略
policy = Policy({"role": "admin", "department": "IT"}, {"obj_type": "server", "location": "datacenter"}, {"time": "10:00"}, True)

# 进行访问决策
decision = policy.evaluate(subject, obj, env)
print(decision)  # 输出 True

在这个示例中，我们定义了 Subject、Object 和 Environment 类来分别表示主体、客体和环境，它们都可以包含各种属性。Policy 类表示访问策略，它包含了主体、客体和环境属性的规则以及允许或禁止访问的决策。最后，我们创建了一个访问请求，并使用 Policy 对象来进行访问决策。