/etc/apache2/includes/freedombox-single-sign-on.conf is in plinth 0.24.0.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | <IfModule mod_auth_pubtkt.c>
TKTAuthPublicKey /etc/apache2/auth-pubtkt-keys/pubkey.pem
TKTAuthLoginURL /plinth/accounts/sso/login/
TKTAuthBackArgName next
TKTAuthDigest SHA512
TKTAuthRefreshURL /plinth/accounts/sso/refresh/
TKTAuthUnauthURL /plinth
AuthType mod_auth_pubtkt
AuthName "FreedomBox Single Sign On"
Require valid-user
</IfModule>
<IfModule !mod_auth_pubtkt.c>
Deny from all
</IfModule>
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