编程实现基于属性点访问控制模型ABAC,条件:创建主体S,客体O,环境E,操作O的集合并写入数据库,创建访问控制策略,可信应用监控器启用,接收用户对权限的访问请求,进行决策,决策结果为拒绝或运行,出现冲突时拒绝优先,缺乏匹配的策略时默认决策为拒绝
时间: 2024-03-17 10:44:23 浏览: 28
ABAC模型(Attribute-Based Access Control)是一种基于属性的访问控制模型,可以根据主体、客体和环境的属性来进行访问控制决策。下面是一个基于属性点访问控制模型ABAC的Python实现,包括创建主体S、客体O、环境E,操作O的集合并写入数据库,创建访问控制策略,可信应用监控器启用,接收用户对权限的访问请求,进行决策等功能。
首先,我们需要安装一些Python库,包括flask、sqlalchemy和pyyaml,我们可以使用pip install命令进行安装。
```python
pip install flask sqlalchemy pyyaml
```
接下来,我们创建一个名为abac的Python包,并在其中创建如下几个文件:
- database.py:用于创建数据库和表格,以及向表格中添加数据。
- model.py:用于定义主体、客体、环境和操作的模型,以及定义访问策略和请求的模型。
- policy.py:用于创建和管理访问策略。
- decision.py:用于进行访问控制决策,并返回决策结果。
database.py:
```python
from flask_sqlalchemy import SQLAlchemy
from model import Subject, Object, Environment, Operation
db = SQLAlchemy()
def create_database():
db.create_all()
def add_subject(name, attributes):
subject = Subject(name=name, attributes=attributes)
db.session.add(subject)
db.session.commit()
def add_object(name, attributes):
object = Object(name=name, attributes=attributes)
db.session.add(object)
db.session.commit()
def add_environment(name, attributes):
environment = Environment(name=name, attributes=attributes)
db.session.add(environment)
db.session.commit()
def add_operation(name, attributes):
operation = Operation(name=name, attributes=attributes)
db.session.add(operation)
db.session.commit()
```
model.py:
```python
from flask_sqlalchemy import SQLAlchemy
from sqlalchemy import Table, Column, Integer, ForeignKey
from sqlalchemy.orm import relationship
db = SQLAlchemy()
class Subject(db.Model):
__tablename__ = 'subjects'
id = Column(Integer, primary_key=True)
name = Column(String(50))
attributes = Column(String(1000))
class Object(db.Model):
__tablename__ = 'objects'
id = Column(Integer, primary_key=True)
name = Column(String(50))
attributes = Column(String(1000))
class Environment(db.Model):
__tablename__ = 'environments'
id = Column(Integer, primary_key=True)
name = Column(String(50))
attributes = Column(String(1000))
class Operation(db.Model):
__tablename__ = 'operations'
id = Column(Integer, primary_key=True)
name = Column(String(50))
attributes = Column(String(1000))
class Policy(db.Model):
__tablename__ = 'policies'
id = Column(Integer, primary_key=True)
subject_id = Column(Integer, ForeignKey('subjects.id'))
object_id = Column(Integer, ForeignKey('objects.id'))
environment_id = Column(Integer, ForeignKey('environments.id'))
operation_id = Column(Integer, ForeignKey('operations.id'))
effect = Column(String(10))
subject = relationship("Subject")
object = relationship("Object")
environment = relationship("Environment")
operation = relationship("Operation")
class Request():
def __init__(self, subject_attributes, object_attributes, environment_attributes, operation_attributes):
self.subject_attributes = subject_attributes
self.object_attributes = object_attributes
self.environment_attributes = environment_attributes
self.operation_attributes = operation_attributes
```
policy.py:
```python
import yaml
from model import Policy, Request, Subject, Object, Environment, Operation
from sqlalchemy import or_
def create_policy(subject_name, object_name, environment_name, operation_name, effect):
policy = Policy(subject=Subject.query.filter_by(name=subject_name).first(),
object=Object.query.filter_by(name=object_name).first(),
environment=Environment.query.filter_by(name=environment_name).first(),
operation=Operation.query.filter_by(name=operation_name).first(),
effect=effect)
db.session.add(policy)
db.session.commit()
def load_policies(file_path):
with open(file_path, 'r') as f:
policies = yaml.load(f, Loader=yaml.FullLoader)
for policy in policies:
create_policy(policy['subject'], policy['object'], policy['environment'], policy['operation'], policy['effect'])
def check_request(request):
policies = Policy.query.filter_by(subject_id=request.subject_attributes['id'],
object_id=request.object_attributes['id'],
operation_id=request.operation_attributes['id']).all()
for policy in policies:
if eval(policy.environment.attributes + '\n' + policy.subject.attributes + '\n' + policy.object.attributes):
return policy.effect
return 'deny'
```
decision.py:
```python
from model import Request
from policy import check_request
def access_control(subject_attributes, object_attributes, environment_attributes, operation_attributes):
request = Request(subject_attributes, object_attributes, environment_attributes, operation_attributes)
return check_request(request)
```
最后,我们编写一个简单的Flask应用程序,用于创建数据库、添加主体、客体、环境和操作,以及对访问请求进行访问控制决策。在启动应用程序之前,请确保已经创建了数据库,并且已经添加了主体、客体、环境和操作。
```python
from flask import Flask, request, jsonify
from database import create_database, add_subject, add_object, add_environment, add_operation
from model import Subject, Object, Environment, Operation
from decision import access_control
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///abac.db'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
create_database()
add_subject('Alice', '{"role": "admin", "department": "finance"}')
add_subject('Bob', '{"role": "user", "department": "sales"}')
add_object('file', '{"type": "confidential", "owner": "Alice"}')
add_object('database', '{"type": "public", "owner": "Bob"}')
add_environment('time', '{"hour": 9}')
add_operation('read', '{"type": "read"}')
add_operation('write', '{"type": "write"}')
@app.route('/access_control', methods=['POST'])
def access_control_endpoint():
subject_attributes = request.json['subject_attributes']
object_attributes = request.json['object_attributes']
environment_attributes = request.json['environment_attributes']
operation_attributes = request.json['operation_attributes']
result = access_control(subject_attributes, object_attributes, environment_attributes, operation_attributes)
return jsonify({'result': result})
if __name__ == '__main__':
app.run(debug=True)
```
现在,我们可以使用POST请求调用/access_control端点,并传递主体、客体、环境和操作的属性,以获取访问控制决策结果。