From: David Groep Date: Mon, 8 May 2015 10:00:00 +0200 Subject: New fetch-crl3 version 3.0.16 improving cache expiry controls Dear CAs, Relying Parties, Users, and all others interested, In this announcement of the IGTF: 1. Updated fetch-crl3 (3.0.16) with improved cache expiry control mitigating issues with too-long cache control expirations sent by certain content delivery networks when serving CRLs ========================================================================= 1. Updated fetch-crl3 (3.0.16) with improved cache expiry control ========================================================================= Some content delivery networks (CDNs), including EdgeCast, may send HTTP cache control headers that cause fetch-crl to retain an copy of a certificate revocation list (CRL) beyond its nextUpdate time. If that happens, this CRL will be considered 'expired' and it will disable the affected CA. However, since the HTTP cache headers had previously indicated that the CRL content was still 'current' as retrieved from the CDN, fetch-crl will NOT update it. Thus, the affected CA or CAs will be 'disabled' for the periodbetween nextUpdate and cache expiry. This currently affects the TERENA "3rd Generation" Trusted Certificate Service, which is served by DigiCert using the EdgeCast CDN. Only the EdgeCast CDN (crl3.digicert.com) is affected; the CacheFly CDN (crl4.digicert.com) does not suffer from this issue. Fetch-crl 3.0.16 implements additional checks that will force cache expiration to happen before nextUpdate (by default, nextUpdate must be at least 7 hours past the cache expiration). It will also limit the maximum time that fetch-crl will consider a CRL 'current' (by default maximum 96 hrs), regardles of cache-control headers. For documentation see http://www.nikhef.nl/grid/fetchcrl3/, and you can download the new version in RRM and source form at https://dist.eugridpma.info/distribution/util/fetch-crl/ This new version will also be available through Fedora EPEL and Debian is due time. ========================================================================= About this news letter ---------------------- This newsletter carries IGTF information intended for relying parties. For more information about this newsletter and how to subscribe, refer to the EUGridPMA web site at https://www.eugridpma.org/ +-----------------------------------------------------------------------+ | For information on the IGTF Distribution, how to use it and what is | | contains, please read the information at | | https://dist.eugridpma.info/distribution/igtf/README.txt | | | | This file contains important information for new users and should be | | read before installing this Distribution. | +-----------------------------------------------------------------------+ If you have suggestions or improvements for the distribution format, to have it better suit your needs, please contact the EUGridPMA PMA at or your Regional Policy Management Authority. See the IGTF web site (www.igtf.net) for further information.