sources/saml: add default error messages to exceptions

[ConzorKingKong]

Details

Gives default message for saml exceptions and allows for adding custom error messages as well

closes #13598

Checklist

• Local tests pass (ak test authentik/)
• The code has been formatted (make lint-fix)

If an API change has been made

• The API schema has been updated (make gen-build)

If changes to the frontend have been made

• The code has been formatted (make web)

If applicable

• The documentation has been updated
• The documentation has been formatted (make website)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.16%. Comparing base (f836c38) to head (c32c9cc).
Report is 30 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15562   +/-   ##
=======================================
  Coverage   93.15%   93.16%           
=======================================
  Files         831      831           
  Lines       44135    44146   +11     
=======================================
+ Hits        41114    41127   +13     
+ Misses       3021     3019    -2     

Flag	Coverage Δ
e2e	46.63% <100.00%> (-0.01%)	⬇️
integration	23.48% <0.00%> (-0.02%)	⬇️
unit	91.25% <100.00%> (+<0.01%)	⬆️

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[cheggerdev]

Thank you for fixing this issue.

[ConzorKingKong]

Anytime @cheggerdev

[cheggerdev]

@rissson @BeryJu Please review this PR

Would you mind to cherry-pick this to 2025.6.x release branch ?

[rissson]

We don't cherry pick those sort of changes to previous versions.

[cheggerdev]

We don't cherry pick those sort of changes to previous versions.

It would be really nice and helpful when this will go into 2025.8

[cheggerdev]

The 2025.8 branch has been opened. Can this PR go into it, please ?

[ConzorKingKong]

@cheggerdev are you running into a SAML error right now that you need this to debug? If you message me on discord, I can try and help you debug your problem. I've played with zabbix a bit while testing some integrations so I might have a little context

[cheggerdev]

@cheggerdev are you running into a SAML error right now that you need this to debug? If you message me on discord — peshekdotdev — I can try and help you debug your problem. I've played with zabbix a bit while testing some integrations so I might have a little context

@ConzorKingKong I still run into a SAML error.
I use a Let's Encrypt certificate issued with acme.sh --ecc.
My current theory is that authentik saml cannot deal with ECC certificates but with RSA only. See issue #15412
authentik oauth works with ECC certificate.