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NJAU CAS authentication helper

Project description

NJAU-Auth

南京农业大学统一身份认证(CAS)登录辅助库,使用纯 HTTP 请求完成登录,不依赖 Playwright 或浏览器自动化。

当前支持:

  • 使用学号和统一认证密码登录。
  • 先 GET 登录页,提取 executionpwdEncryptSalt
  • 使用 AES-128-CBC / PKCS7 生成提交用密码密文。
  • 登录前自动检查是否需要图形验证码,必要时用 ddddocr 默认模型识别 80x30 四位字符验证码。
  • 检测账号密码错误、验证码要求和短信二次验证。
  • 通过回调提交短信验证码。
  • 保存并复用 Cookie,减少重复登录。
  • 默认服务地址为 http://jw3.njau.edu.cn/

Installation

pip install njau-auth

Basic Usage

import asyncio
from njau_auth import NJAUAuthManager


async def sms_callback(challenge):
    print(challenge.message)
    return input("SMS code: ").strip()


async def main():
    manager = NJAUAuthManager(
        student_id="2023000000",
        password="your-password",
        sms_callback=sms_callback,
    )

    async with manager:
        result = await manager.login()
        print(result.final_url)
        print(result.cookies)


asyncio.run(main())

CLI

njau-auth-login --student-id 2023000000

如果不传 --password,命令会从交互式密码输入读取。

调试验证码识别时可以保存图片,或指定一次手动验证码:

njau-auth-login --student-id 2023000000 --captcha-image-dir ./captchas
njau-auth-login --student-id 2023000000 --captcha-code abcd

Notes

  • 默认密码密文使用当前 CAS 可接受的形态:pwdEncryptSalt 作为 AES key、固定 16 字节 IV、64 位随机前缀 + 原始密码 作为明文。
  • 图形验证码默认使用 ddddocr 的 common.onnx 模型自动识别。
  • utils.crypto 里保留了固定 key 的兼容函数 encrypt_password_with_fixed_key(),用于兼容其他部署或后续验证。
  • 如果要认证其他 CAS 服务,可在 NJAUAuthClientNJAUAuthManager 中传入 service_urlsuccess_url_contains
  • 当统一认证要求滑块验证码,或图形验证码多次识别失败时,当前版本会抛出 CaptchaRequiredError

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