[JIRA] Commented: (SSPCPP-441) Libcurl versions before 7.20 do not refresh caches of IdP IP address look-ups - this breaks SAML1 attribute query if the IdP's IP address is changed

[Scott Cantor (JIRA)]

    [ https://issues.shibboleth.net/jira/browse/SSPCPP-441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14021#comment-14021 ] 

Scott Cantor commented on SSPCPP-441:
-------------------------------------

I probably just assumed, I didn't think that making it opt-in would buy you a lot. That's probably feasible.

I don't know if that would fix it or not; if it's fixable with an accessible setting, then that could work. I'm also willing to do something in the code to set that option myself so that 2.5 would just fix it outright.

Is that something you can test?


> Libcurl versions before 7.20 do not refresh caches of IdP IP address look-ups - this breaks SAML1 attribute query if the IdP's IP address is changed
> ----------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: SSPCPP-441
>                 URL: https://issues.shibboleth.net/jira/browse/SSPCPP-441
>             Project: Shibboleth SP - C++
>          Issue Type: Bug
>         Environment: CentOS 5, RedHat 5, any other distribution that ships a version of libcurl before 7.20
> CentOS 6 and RedHat 6 are not affected, please see Description for reason why.
>            Reporter: Sara Hopkins
>            Assignee: Scott Cantor
>
> Please see this shibboleth-users discussion, in particular the last six emails:
> http://groups.google.com/group/shibboleth-users/browse_thread/thread/03b347520659428c/1b866419a1198144?pli=1
> There is a bug in libcurl versions lower than 7.20 which means that once an IdP's IP address has been looked up for attribute query purposes, it is cached and no further DNS lookups are made for that hostname until the SP is restarted. The bug was fixed in libcurl 7.20 - http://daniel.haxx.se/blog/2010/02/09/a-big-curl-forward/ - and http://curl.haxx.se/changes.html
> So, if an IdP IP address is changed, and it runs up against this bug, the SP operator has to restart shibd to get things working again for that IdP/SP pair..
> I know that this is not an SP bug, but the problem is that the CentOS5/RedHat5 libcurl is only 7.15.5! This is something of a problem for operators of SPs on those platforms. But I know that the CentOS and RH6 platforms are not affected, even though they also ship a version of libcurl lower than 7.20, because of this:
> https://wiki.shibboleth.net/confluence/display/SHIB2/NativeSPLinuxRH6
> Might I suggest that this solution is built for CentOS/RH5 as well, in order to work around this libcurl bug?

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