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SAML Login via iFrame fails with "OneLogin\Saml2\Error Invalid ACS Response: invalid_response" #2857
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opened 2026-02-05 05:28:49 +03:00 by OVERLORD
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Reference: starred/BookStack#2857
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Originally created by @add-n2x on GitHub (Jun 18, 2022).
Attempted Debugging
Searched GitHub Issues
Describe the Scenario
I've configured BookStack with an external SimpleSAML idP at sso.domain.com. This is working fine in an individual browser tab.
Then there is also a Nextcloud menu integration at cloud.domain.com. I'm explicitly allowing BookStack to be embedded into iFrames by having these set:
So far so good. But when I click on the Bockstack Login button in the iFrame I get:
No InResponseTo at the Response, but it was provided the requestId related to the AuthNRequest sent by the SP: ONELOGIN_de3e4f6fd111dabe7794c431f9fc050c0160a0e6Exact BookStack Version
v22.04.2
Log Content
Server Log
Browser Log
Stacktrace
PHP Version
8.1.6
Hosting Environment
Ubuntu VPS, Caddy, BookStack & DB in Docker Compose
PHP Version: 8.1.6
BookStack Version: v22.04.2
@ssddanbrown commented on GitHub (Jun 18, 2022):
Hi @davidtrattnig,
Usually scenarios like this can have trouble due to cookie controls blocking cookie usage within iframes and hence issues with session persistence.
Based upon the error message, It seems to me like the BookStack session system is working but something is lost in the response back from SimpleSAML.
Assuming you're using SimpleSAMLphp, what values are set for the
session.cookie.secureandsession.cookie.samesiteoptions (If existing)?@add-n2x commented on GitHub (Jun 19, 2022):
Thanks @ssddanbrown. Yes it's SimpleSAML. I don't have these Cookies set. But I have a "
__Host-nc_sameSiteCookiestrict: true" and "__Host-nc_sameSiteCookielax: true" set in the Cookie. Not sure if that's related to SimpleSAML.@ssddanbrown commented on GitHub (Jun 19, 2022):
Hi @davidtrattnig,
For clarity, the option names I listed previously were for options within your SimpleSAMLphp configuration file, not the name of cookies.
Do you have such options in your SimpleSAMLphp config?
@add-n2x commented on GitHub (Jun 19, 2022):
Clear, thx. I do not have control over the SimpleSAML instance but it is hosted by a third party. I've forwarded your tip and am waiting for an answer now.
@ssddanbrown commented on GitHub (Jun 25, 2022):
I'm going to close this off since there's no pending action on our side but if you need any other support feel free to still comment and this can be re-opened if required.