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Webauth error starting on Sunday

Kai Lanz lanz at stanford.edu
Mon Dec 14 10:07:02 PST 2015


Starting Sunday, Dec. 13, at about 4am, we started getting errors from webauth on our department server, Pangea.
We have the following in apache’s error_log:

[Sun Dec 13 17:00:01 2015] [error] mod_webauth: curl_easy_perform: error(35): error:0D0890A1:asn1 encoding routines:func(137):reason(161)
[Sun Dec 13 17:00:01 2015] [error] mod_webauth: mwa_get_service_token: couldn't get new service token from webkdc
[Sun Dec 13 17:00:01 2015] [emerg] mod_webauth: mwa_get_service_token FAILD!!
[Sun Dec 13 17:00:01 2015] [emerg] mod_webauth: redirect_request_token: no service token, denying request
[Sun Dec 13 17:00:01 2015] [warn] mod_webauth: failure_redirect: no URL configured

Googling for these errors turns up a post from Russ Allbery in 2013 which says these symptoms occur when the
campus KDC admins renew their SSL cert, and the new cert uses a different signing authority from the old one.

Was there an update to the SSL certs on our KDCs over the weekend? It has broken webauth on our server; we
rely on webauth pretty extensively, and a lot of our pages are now inaccessible. If Russ’s old post is correct, what
is the new signing authority? How can I incorporate that into our config on Pangea to fix this? (I have a ca-bundle.crt
file in /usr/share/ssl/certs which I could update if I knew who the new signer is.)

— Kai Lanz
Senior System Administrator


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