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Bug: logging in after clearing session redirects to clearing session #112


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closes #28

@Flix6x Flix6x self-assigned this May 1, 2021
@Flix6x Flix6x added bug Something isn't working UI labels May 1, 2021
@Flix6x Flix6x added this to the 0.5.0 milestone May 1, 2021
@Flix6x Flix6x marked this pull request as ready for review May 1, 2021 14:10
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Flix6x commented May 1, 2021

In this PR I try to address the underlying problem: that clearing the session is not supposed to log out the user.

We had some logic to prevent this already, which keeps around a few session keys that relate to the user being logged in. I added three more Flask session keys that I saw were immediately in use after a user logs in. I think these new session keys may not have been in use when @nhoening first set up this logic in f559b72?

@Flix6x Flix6x requested a review from nhoening May 1, 2021 14:22
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nhoening commented May 1, 2021

The logout function in Flask_Security does invalidate the fs_paa and fs_cc fields, so seen from that side we seem to do it correctly to leave them alone if we do not want a logout. I also checked how old the lines are in that function which deal with these fields and they are younger than our last commit about this stuff.

I also learned the following:
"fs_" is a slask security namespace.
"paa" stands for "Primary authentication at" and "Cc" for "CSRF cookie".
"_fresh" is from flask_login and marks if the session is fresh. It gets invalidates in flask_login's implementation of logout_user.

So ― I'm fine with them staying if that helps.

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nhoening commented May 1, 2021

Should we add a change log entry for this?

@Flix6x Flix6x merged commit 52a8f41 into main May 1, 2021
@Flix6x Flix6x deleted the issue-28-Bug_logging_in_after_clearing_session_redirects_to_clearing_session branch May 1, 2021 21:51
Flix6x added a commit that referenced this pull request May 6, 2021
… clearing session (#112)

Prevent user from being logged out when clearing the session.

* Create draft PR for #28

* More session keys to avoid clearing

* Changelog entry

Co-authored-by: Flix6x <>
Co-authored-by: F.N. Claessen <>
Co-authored-by: Felix Claessen <>
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Bug: logging in after clearing session redirects to clearing session
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