[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=14019#comment-14019 ] 

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

That's a pretty massive step to take, particularly since I think every Linux distribution would be affected, and the solution we had to use for RH6 is *not* popular, to understate matters.

I suppose one option would be to offer the rebuilt libcurl packages, but just document how to install and select it in the non-RH6 case. I don't know that that helps you much, though, since very few sites would bother.

I would suggest you make the case for this on the dev list and see what kind of reaction there is.

> 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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