حلقة إعادة التوجيه لـ SSO

الدعم
1

Hey there,

we’re using Discourse [v2.3.0.beta2 +130] with SSO. For a few months now (sorry that I can’t pinpoint the exact update that caused the issue) collegues are reporting SSO redirect loops (followed by 429 errors which is ok) when clicking on discourse links in webmail clients. This only happens, if one is already logged in. We can reproduce in Firefox and Chrome on Windows and Linux. Steps to reproduce:

  • When logged out of discourse (all cookies cleaned etc)
  • Click on a Disourse link in Gmail or Zimbra
  • A new tab opens with the Discourse URL
  • After getting redirected to our SSO login enter your credencials
  • You get successfully logged in
  • Click on another Discourse link in Gmail or Zimbra
  • A new tab opens with the Discourse URL
  • You get redirected to the SSO login
  • Then you get redirected back to Disrourse with the token in the URL
  • Then Discourse redirects you back to the SSO login
  • and so on …

Strangly this doesn’t happen if the link is copy/pasted instead of clicked on. This strikes me as weird.

These are the URLs in the loop

  • https:// forum.our.tld/
  • https:// forum.our.tld/session/sso
  • https:// sso.our.tld/sso/discourse?sso=bm9u…%3D%3D&sig=3944…
  • https:// forum.our.tld/session/sso_login?sso=bm9uY…1B%0AbmRyZWFz…Vhc19sYXV0X…JTQwZ2…dHAlM0ElMkYl…BBKitodHRw…pdG9y…rJTI4ZW…Vu%0AZGUr…9fdXJs%0APWh0…Nlc3Npb2…3D%0A&sig=13f4…

I found similar topics here but none of them is matching my exact problem:

Any ideas what might be wrong here?

2

I’d be interested to check the email provider responsible for sending emails on behalf of your discourse install, I’ve seen similar behaviour on a client when they accidentally enabled email tracking (which essentially rewrites the links) on the discourse emails.

There can be other potential candidates too which may need the forum link for identification.

3

Discourse is sending mails via our own mailservers. There’s no link rewriting or tracking involved.

I also suspected Gmail at first, but the issue is the same with Zimbra.

4

Did you check the email raw? Maybe something interesting can be found there.

But before I row this to the wrong bank, are those links actually being opened in a real browser or some sort of web-view

5

It’s a real desktop browser. Right-click → copy link location → paste works. A simple left-click opens a new tab and then hangs in the loop. I don’t know if some Javascript is interfering with what’s actually happening or if it’s just a target=blank.

6

I think You really need to check the email RAW for possible issues since the link being sent is correct.

7

I can even reproduce with this page:

<!doctype html>
<html>
  <head><title>foo</title></head>
  <body>
    <a href="https://forum.our.tld/t/title/3940/551">https://forum.our.tld/t/title/3940/551</a>
  </body>
</html>

When clicking on the link I’m in the redirect loop, if I copy/paste it it works.
I’m … puzzeled.
The only thing I can think of that’s different in a browser when clicking on a link vs. copy/pasting the link is the referrer.

8

عذراً إذا كنت أقول الشيء الأكثر وضوحاً، لكنني أرى مصدر المشكلة في هذه المسألة على WebKit WebView.
حاولت استخدام الحلول البديلة المذكورة هنا على منتدى discourse دون نجاح.

اقترح أحد زملائي (وهو مبرمج ويب، بينما لست كذلك) إجراء تغيير ما على مزود SSO (وليس myforum.com/session/sso_provider) بحيث عند استدعائه للمنتدى، يرسل طلب GET في استعلام URL مع معلمة إضافية هي login=mylogin.
من المرجح أن استدعاء إنشاء الرمز يتغير
من myssoprovider.com/sso?sso=xxxxx&sig=xxxxx
إلى myssoprovider.com/sso?sso=xxxxx&sig=xxxxx&login=mylogin.

لكن حسب علمي، لا يمكن تنفيذ مثل هذا الشيء من جانب discourse عبر لوحة الإعدادات، بل يتطلب ذلك تعديلاً يتعمق أكثر وقد يسبب مشاكل أو يُفقد عند التحديثات.

شكراً لاقتراحاتكم.

9

لا أحد لديه فكرة حول ذلك سوى انتظار إصلاح أبل للمشكلة؟

10

مرحبًا @nikod، واجهنا مشكلة مماثلة في شركتنا وحلناها عن طريق ضبط إعداد “ملفات تعريف الارتباط من نفس الموقع” على “lax” بدلاً من “strict”:

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