Python 和带有 Flask 的 AzureAD - ms-identity-python-webapp 示例仅间歇性登录

Question

我正在尝试从此处设置 Azure AD 身份验证示例： https://github.com/Azure-Samples/ms-identity-python-webapp

我在 AzureAD 上设置了所有配置和权限，但我在登录时遇到间歇性问题。

我已将问题追查到会话密钥，要么没有在 session.get('user'):

内正确写入或读取

def index():
    if not session.get("user"):
        return redirect(url_for("login"))
    return render_template('index.html', user=session["user"], version=msal.__version__)

此外，

if request.args.get('state') != session.get("state"):
    return redirect(url_for("index"))  # No-OP. Goes back to Index page

永远不会 returns 正确，但如果我将其注释掉，有时一切都会正常，它将登录，并允许访问图形应用程序。

我已经在本地设置了 flask_session 目录，它会为每次登录创建缓存（大约 8kb）。

清除 flask_session 文件夹并重新启动应用程序似乎有所帮助，但并不可靠。

如有任何帮助，我们将不胜感激！

为方便起见复制在这里的完整示例：

import uuid
import requests
from flask import Flask, render_template, session, request, redirect, url_for
from flask_session import Session  # https://pythonhosted.org/Flask-Session
import msal
import app_config


app = Flask(__name__)
app.config.from_object(app_config)
Session(app)

# This section is needed for url_for("foo", _external=True) to automatically
# generate http scheme when this sample is running on localhost,
# and to generate https scheme when it is deployed behind reversed proxy.
# See also https://flask.palletsprojects.com/en/1.0.x/deploying/wsgi-standalone/#proxy-setups
from werkzeug.middleware.proxy_fix import ProxyFix
app.wsgi_app = ProxyFix(app.wsgi_app, x_proto=1, x_host=1)

@app.route("/")
def index():
    if not session.get("user"):
        return redirect(url_for("login"))
    return render_template('index.html', user=session["user"], version=msal.__version__)

@app.route("/login")
def login():
    session["state"] = str(uuid.uuid4())
    # Technically we could use empty list [] as scopes to do just sign in,
    # here we choose to also collect end user consent upfront
    auth_url = _build_auth_url(scopes=app_config.SCOPE, state=session["state"])
    return render_template("login.html", auth_url=auth_url, version=msal.__version__)

@app.route(app_config.REDIRECT_PATH)  # Its absolute URL must match your app's redirect_uri set in AAD
def authorized():
    if request.args.get('state') != session.get("state"):
        return redirect(url_for("index"))  # No-OP. Goes back to Index page
    if "error" in request.args:  # Authentication/Authorization failure
        return render_template("auth_error.html", result=request.args)
    if request.args.get('code'):
        cache = _load_cache()
        result = _build_msal_app(cache=cache).acquire_token_by_authorization_code(
            request.args['code'],
            scopes=app_config.SCOPE,  # Misspelled scope would cause an HTTP 400 error here
            redirect_uri=url_for("authorized", _external=True))
        if "error" in result:
            return render_template("auth_error.html", result=result)
        session["user"] = result.get("id_token_claims")
        _save_cache(cache)
    return redirect(url_for("index"))

@app.route("/logout")
def logout():
    session.clear()  # Wipe out user and its token cache from session
    return redirect(  # Also logout from your tenant's web session
        app_config.AUTHORITY + "/oauth2/v2.0/logout" +
        "?post_logout_redirect_uri=" + url_for("index", _external=True))

@app.route("/graphcall")
def graphcall():
    token = _get_token_from_cache(app_config.SCOPE)
    if not token:
        return redirect(url_for("login"))
    graph_data = requests.get(  # Use token to call downstream service
        app_config.ENDPOINT,
        headers={'Authorization': 'Bearer ' + token['access_token']},
        ).json()
    return render_template('display.html', result=graph_data)


def _load_cache():
    cache = msal.SerializableTokenCache()
    if session.get("token_cache"):
        cache.deserialize(session["token_cache"])
    return cache

def _save_cache(cache):
    if cache.has_state_changed:
        session["token_cache"] = cache.serialize()

def _build_msal_app(cache=None, authority=None):
    return msal.ConfidentialClientApplication(
        app_config.CLIENT_ID, authority=authority or app_config.AUTHORITY,
        client_credential=app_config.CLIENT_SECRET, token_cache=cache)

def _build_auth_url(authority=None, scopes=None, state=None):
    return _build_msal_app(authority=authority).get_authorization_request_url(
        scopes or [],
        state=state or str(uuid.uuid4()),
        redirect_uri=url_for("authorized", _external=True))

def _get_token_from_cache(scope=None):
    cache = _load_cache()  # This web app maintains one cache per session
    cca = _build_msal_app(cache=cache)
    accounts = cca.get_accounts()
    if accounts:  # So all account(s) belong to the current signed-in user
        result = cca.acquire_token_silent(scope, account=accounts[0])
        _save_cache(cache)
        return result

app.jinja_env.globals.update(_build_auth_url=_build_auth_url)  # Used in template

if __name__ == "__main__":
    app.run()

Answer 1

我找到了解决方案，或者更准确地说是我的失败：

这个回购： https://github.com/rayluo/flask-session

与此不同： https://github.com/fengsp/flask-session

包含的 requirements.txt 从 rayluo（谢谢！）加载 newer/maintained flask-session，而不是从 pip 加载。

所以对于其他发现此问题的人，请确保您使用正确的版本！

Answer 2

我是 Azure AD 身份验证示例的维护者之一：https://github.com/Azure-Samples/ms-identity-python-webapp 我是我的变通办法回购协议的作者 https://github.com/rayluo/flask-session

在撰写本文时，间接上游模块 cachelib 已在 2 天前发布了一个错误修复，大约在同一时间您遇到了这个问题。因此，对于这里的任何未来读者：您不必显式切换即可使用上述解决方法。该 Azure AD Web 应用程序示例将正确声明它需要的正确依赖项。

Python 和带有 Flask 的 AzureAD - ms-identity-python-webapp 示例仅间歇性登录

Python and AzureAD with Flask - ms-identity-python-webapp example only logging in intermittently

python

azure-active-directory

adal

msal