[PATCH 1/1] Just warn if linked libssl is more recent

Arran Cudbard-Bell a.cudbardb at freeradius.org
Tue Jun 17 11:10:31 CEST 2014

On 17 Jun 2014, at 08:43, Christian Hesse <list at eworm.de> wrote:

> Arran Cudbard-Bell <a.cudbardb at freeradius.org> on Tue, 2014/06/17 08:31:
>> On 17 Jun 2014, at 07:12, Christian Hesse <list at eworm.de> wrote:
>>> From: Christian Hesse <mail at eworm.de>
>>> Even if dynamic linking is just fine, radiusd fails after ever openssl
>>> update. (Distribution toolkits do not detect this, so distribution
>>> packages break on a regular basis.)
>>> This changes behavior so that it still fails on library downgrade, but
>>> just warns if openssl library has been upgraded.
>> The point of adding the check, was because even minor versions of libssl
>> had changes which broke ABI compatibility.
>> I'm not sure how your suggestion helps? If there's any change in libssl
>> version it could cause ABI incompatibility, it doesn't matter if it's
>> an upgrade or downgrade.
> I had thought this is to fetch cases where libssl version changes and
> introduces any (possibly old) security vulnerabilities.
> In theory ABI should stay compatible with minor updates. And major updates
> should break if dynamic linking breaks.
> Or did that happen when system toolchain (gcc and friends) was updated?
> Still the question is whether freeradius should break on ABI incompatibility
> change (which should still give a warning with my patch) or break on *every*
> openssl update, regardless of whether or not ABI changed.
> Searching for "freeradius libssl version mismatch" gives a lot of matches, so
> looks like this is a real issue.

Some of those aren't for FreeRADIUS.


OpenSSH has also adopted this approach, with a very similar message to us.
Obviously they got annoyed too.

I've changed the behaviour to match theirs.

Arran Cudbard-Bell <a.cudbardb at freeradius.org>
FreeRADIUS Development Team

FD31 3077 42EC 7FCD 32FE 5EE2 56CF 27F9 30A8 CAA2

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