直接上源码

# -*- coding:utf-8 -*-
"""
Created on 2017/7/1

@author: jj
模拟 csrf

csrf 验证cookie 中的 csrftoken  和 post 请求中的 csrfmiddlewaretoken 是否一致
再验证是否为 服务其发出的 csrftoken

cas 验证规则
在 csrf 的基础上验证  post 请求中 lt
"""
import urllib
import urllib2
import requests
import re
import cookielib

headers = [('User-Agent', 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.86 Safari/537.36')]
login_url = "http://127.0.0.1:8000/cas/login"  # POST发送到的网址
# login_url = "http://127.0.0.1:8000/admin/login/?next=/admin/"  # POST发送到的网址

filename = 'cookie.txt'


def login(par1):

    cookie = cookielib.MozillaCookieJar()
    # 从文件中读取cookie内容到变量
    cookie.load(filename, ignore_discard=True, ignore_expires=True)
    # 创建请求的request
    postdata = urllib.urlencode(par1)
    # 利用urllib2的build_opener方法创建一个opener
    opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cookie))
    opener.addheaders.append(headers[0])
    opener.addheaders.append(headers[1])
    response = opener.open(login_url, postdata)
    print response.read()


def save_cookie():
    ckjar = cookielib.MozillaCookieJar(filename)
    ckproc = urllib2.HTTPCookieProcessor(ckjar)
    opener = urllib2.build_opener(ckproc)
    f = opener.open(login_url)
    content = f.read()
    pattern_csrf = re.compile(r"name='csrfmiddlewaretoken' value='(.*?)' />", re.S)
    pattern_lt = re.compile(r'<input id="id_lt" name="lt" type="hidden" value="(.*?)" />', re.S)
    csrf = re.findall(pattern_csrf, content)
    lt = re.findall(pattern_lt, content)
    f.close()
    ckjar.save(ignore_discard=True, ignore_expires=True)
    return csrf[0], lt[0]


if __name__ == "__main__":
    csrf, lt = save_cookie()

    headers.append(('csrftoken', csrf))

    data = {"username": "admin",
            "password": "admin",
            "csrfmiddlewaretoken": csrf,
            "lt": lt,
            "renew": 'False',
            "warn": 'on'}
    login(data)

返回结果