Landing page on saml login

Soutien
1

On previous versions, a landing page was shown on which the “login” button appeared. Clicking this buttons showed the saml login page.
Personally, I really liked this behavior. With the current version 2.4.2 this isn’t possible any more as the saml login page is shown immediately.

Is it configurable?

2

I am not following, you mean we showed a modal that had a single button “Login with SAML” ?

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3

No.
in a previous version (I guess it was 2.3.6) it was like this:

login
login2102×519 38.3 KB

After clicking on « Anmelden » the SAML login window appeared.

If I enable « local logins » the landing page with the login button appears again but I don’t want to have local login and therefore I need to disable it.

4

Can someone help me? maybe @eviltrout ?

5

I certainly didn’t change this on purpose. If you could help us track down when it changed that would be helpful as we could look into the context.

It’s possible it changed for security reasons.

6

This was a long requested improvement to make omniauth behave like real SSO, when the number of omniauth login methods is only one.

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7

How can I help?

one hint: if you enable “local login”, the “Landing page together with the login button” is shown.

8

If you really want the confirmation page, you can link the user to /login (rather than the homepage). That will not trigger the login automatically.

But note this is not really supported, it is just a quirk of the implementation and may change at any time.

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9

New behavior is better and consistent with SSO login. If a message is needed before login it can be implemented in the Identity Provider.

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10

ah, good to know.
I know of 2 reasons:

  • show a very nice landing page with some basic information instead of that “boring” login window
  • “security” (I know, its not really a big blocker). Cheap hacking scripts on the main URL (without the landing page) would fail hopefully as its required to press the login button first.

Is it possible to configure this behavior?

11

You are going to need to hire a dev here to build a plugin to change this. As it stands this is the first complaint I have heard about the new system in months.

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12

I’m a dev :slight_smile: (see my changes in discourse_saml)

Would you accept a PR which adds a configuration option (default: new behavior)?

14

The automatic redirect should not introduce any security vulnerabilities. If you are aware of an exploit, please let us know via our disclosure program: discourse/docs/SECURITY.md at main · discourse/discourse · GitHub

I don’t think we want to add more noise to the settings until we have some more users requesting this change.

You could override this in a plugin by patching this method:

So I think you would want to simplify the function right down to

def redirect_to_login
  dont_cache_page
  cookies[:destination_url] = destination_url
  redirect_to path("/login")
end
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Simple plugin to create landing page for SSO not working anymore
15

Thank you. Very appreciated!
BTW: You are doing a great job with Discourse.

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16

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