Re: OCSP? (UNCLASSIFIED)
Thank you François! After reading the documentation and looking at the Apache developer's notes, I am still not clear on how to specify an OCSP responder if the responder URI is not included in the responder's certificate. From the Apache developer's notes, I think it is via a configuration option in ssl.conf, but I have not seen an example, only misc notes. Does anyone know how to do this? We would like to be able to specify a specific responder if the URI is not contained in the server's cert. Thanks in advance. Paul François Soumillion wrote: http://www.belgium.be/zip/eid_authentication_proxy_fr.html You will find there an updated version of mod-ssl including OCSP check as well as the documentation to set it up. 2006/10/11, Victor, Dwight P CTR DISA PAC [EMAIL PROTECTED]: Classification: UNCLASSIFIED Caveats: NONE Hi Eriks, Thanks for the tip regarding Tumbleweed WebCullis. I'll definitely have to do some research. Paul, One of my web searches pulled up the fact that HP-UX has a OCSP enabled version of mod_ssl. Seems to be a lucky break for you. Hope that works out. I have experienced a large memory hit anytime certificate checking is performed against the CRLs (some of which are 13 MB in size) in the range of 75MB per Apache server instance. Luckily we aren't that busy, or we would definitely be feeling the pain. BTW, I've been reading a bit about mod_nss (http://directory.fedora.redhat.com/wiki/Mod_nss). This module sounds interesting, but it isn't supported on HP-UX. I'll have to give it a try and I'll let the list know the results (if I can find some time to play with it). Thanks again, Dwight... --- Dwight Victor, CISSP (Contractor) EMAIL: [EMAIL PROTECTED] SMAIL: [EMAIL PROTECTED] TEL: (808) 653-3677 ext 229 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Wednesday, October 11, 2006 10:55 AM To: modssl-users@modssl.org Subject: RE: OCSP? (UNCLASSIFIED) Thanks Eriks, appreciate the info. We are using HP-UX, so the Tumbleweed solution won't work for us. We do have an HP version of Apache that has the OCSP mod of mod_ssl, but we just installed it (today) and haven't had a chance to look at the documentation yet. Will post back and let you know what we found out. Thanks again. Paul Richters, Eriks A wrote: I went down this road a few months ago. Someone wrote a patch that would add OCSP client functionality to Apache, but the patch never got folded into the Apache mainline code. We spent a bit of effort trying to get the patch to work with our version of Apache with no luck. There are two products from commercial organizations out there that can help. One is from Tumbleweed, called Server Validator. It's pricey about $2000 per server, but works pretty well. Its very easy to install and configure and has some nice features for supporting OCSP and failing over to CRLs. It is supported on several platforms. The other product is called WebCullis from the organization that used to be Orion Security. (Orion Security has since been bought by Entrust.) It used to be under the GPL, which was nice. At the time, they only had a version for Windows and Intel based Solaris. I hope this helps. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of pbains Sent: Wednesday, October 11, 2006 4:32 PM To: modssl-users@modssl.org Subject: Re: OCSP? (UNCLASSIFIED) My organization is headed down this road after experiencing performance degradation from checking large CRLs. As we come up with a solution, will post what I find out. Alternatively, if you have any information, would appreciate it, thanks! Paul Victor, Dwight P CTR DISA PAC wrote: Classification: UNCLASSIFIED Caveats: NONE Hello List! Has anyone had any experience/success with using mod_ssl + Apache v2 to query an OCSP responder regarding the status of an end-user provided certificate and allow/deny access based on the response? Any tips, suggestions, discussion would be appreciated. Best Regards, Dwight... --- Dwight Victor, CISSP (Contractor) Systems Administrator / Webmaster General Dynamics C4 Systems EMAIL: [EMAIL PROTECTED] TEL: (808) 653-3677 ext 229 Classification: UNCLASSIFIED Caveats: NONE -- View this message in context: http://www.nabble.com/OCSP--%28UNCLASSIFIED%29-tf1638361.html#a6764147 Sent from the mod_ssl - Users mailing list archive at Nabble.com. __ Apache Interface to OpenSSL (mod_ssl) www.modssl.org User Support Mailing List modssl-users@modssl.org Automated List Manager[EMAIL PROTECTED] __ Apache Interface to OpenSSL (mod_ssl
Re: OCSP? (UNCLASSIFIED)
My organization is headed down this road after experiencing performance degradation from checking large CRLs. As we come up with a solution, will post what I find out. Alternatively, if you have any information, would appreciate it, thanks! Paul Victor, Dwight P CTR DISA PAC wrote: Classification: UNCLASSIFIED Caveats: NONE Hello List! Has anyone had any experience/success with using mod_ssl + Apache v2 to query an OCSP responder regarding the status of an end-user provided certificate and allow/deny access based on the response? Any tips, suggestions, discussion would be appreciated. Best Regards, Dwight... --- Dwight Victor, CISSP (Contractor) Systems Administrator / Webmaster General Dynamics C4 Systems EMAIL: [EMAIL PROTECTED] TEL: (808) 653-3677 ext 229 Classification: UNCLASSIFIED Caveats: NONE -- View this message in context: http://www.nabble.com/OCSP--%28UNCLASSIFIED%29-tf1638361.html#a6764147 Sent from the mod_ssl - Users mailing list archive at Nabble.com. __ Apache Interface to OpenSSL (mod_ssl) www.modssl.org User Support Mailing List modssl-users@modssl.org Automated List Manager[EMAIL PROTECTED]
RE: CRL Checking Uses Excessive Memory
I am working on a DoD project, and we are experiencing high CPU load on HP-UX servers with multiple CPUs in this scenario. We are thinking it is because the CRL size for some CAs is huge - ad-hoc tests done with certs associated with small CRLs do not produce CPU spikes, but large CRLs do. We are running an older version of Apache and the mod_ssl package without OCSP support, but have just installed an updated Apache with mod_ssl and OCSP support. Anyone using this, and if so, have any luck with it? Thanks in advance! Paul Victor, Dwight P CTR DISA PAC wrote: Hi Rob, I also work for the DoD and am using the same CRLs as you (downloaded and converted on a daily basis). We're running a Linux webserver with a single 1.8Ghz Celeron, 512MB of RAM, and 1GB of swap. I haven't noticed any memory issues when checking CRLs. My Apache server starts multiple child servers. It looks like the child servers hit around 60MB of memory usage (max) when processing CRL checks; 500KB to 1MB seems to be the average child server's memory usage when idle. top says my current load average is about 0.03, 0.01, 0.00. When checking CRLs, top says my load average zooms up to around 0.20, 0.05, 0.01. Of course, my userbase is very small and we aren't doing a ton of CRL checks. OCSP should resolve your issue with plowing through the CRLs, however, I have yet to find a viable OCSP solution. There was a patch for mod_ssl, but I haven't heard anything about it since it was last released in 2004. Maybe someone else on this list knows? Rob, why don't you email me offline. I'm in the DISA GAL, if you can get to that. Dwight... -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Walls Rob W Contr 75 CS/SCBS Sent: Friday, April 21, 2006 10:47 AM To: 'modssl-users@modssl.org' Subject: CRL Checking Uses Excessive Memory I work for the DoD. We have about a dozen CA's with their own CRL files. Some of these are over 20M in size. When CRL checking is enabled in Apache (for Linux or Windows), memory use is excessive and httpd processes are killed by the OS (Linux) due to out of memory conditions and all the memory swapping activity sends the proc utilization way up there and makes the server unresponsive. On Windows the CPU use just pegs at 100% (I have no idea what else is going on in there). CRL's are downloaded every day and openssl is used to make hash'd file names (ssl.conf is using SSLCARevocationPath). I don't currently restart apache after retrieving the new CRL files. The Linux machine runs redhat with dual 3ghz xeons and 2Gb ram. SSL works great, but as soon as CRLs are checked, apache starts to go south! I have a 2Gb swap partition and have added another 2Gb swap file to at least keep things running, but it becomes so slow it might as well crash. Each httpd process goes from using about 14Mb of memory when not CRL checking to 250Mb when CRL checking is enabled! BTW: anywhere from 10 to 20 concurrent httpd processes are normal for that machine. Any ideas on how to use large CRL's in Apache? Do I just need more memory? If Apache can't use many large CRL files, would an OSCP solution side-step these problems? Any good ones out there? __ Apache Interface to OpenSSL (mod_ssl) www.modssl.org User Support Mailing List modssl-users@modssl.org Automated List Manager[EMAIL PROTECTED] __ Apache Interface to OpenSSL (mod_ssl) www.modssl.org User Support Mailing List modssl-users@modssl.org Automated List Manager[EMAIL PROTECTED] -- View this message in context: http://www.nabble.com/CRL-Checking-Uses-Excessive-Memory-tf1488925.html#a6764331 Sent from the mod_ssl - Users mailing list archive at Nabble.com. __ Apache Interface to OpenSSL (mod_ssl) www.modssl.org User Support Mailing List modssl-users@modssl.org Automated List Manager[EMAIL PROTECTED]
