Does nginx support SSL resumption?

[Igor Sysoev]

On Sat, May 30, 2009 at 12:04:27AM -0700, Michael Shadle wrote:

> Is there any reason for not enabling this? some sort of possible security risk?

> Seems like it saves a lot of negotiation overhead on each request

Yes. However, built-in OpenSSL session cache leads to memory fragmentation,
see http://marc.info/?t=120127289900027

Also I do think that shared SSL session cache should be enabled by default.

BTW, http://wiki.nginx.org/NginxHttpSslModule is outdated:
ssl_session_cache has yet two paramters "off" and "none" (default one):

"off" is hard off: nginx says explicitly to a client that sessions can not
reused.

"none" is soft off: nginx says to a client that session can be resued, but
nginx actually never reuses them. This is workaround for some mail clients
as ssl_session_cache may be used in mail proxy as well as in HTTP server.

> This is what I mean by "SSL resumption" I think it's what you're
> talking about too.
> http://rdist.root.org/2009/03/10/note-to-wordpress-on-ssl/
> 
> 
> 
> 2009/5/29 Igor Sysoev <is at rambler-co.ru>:
> > On Fri, May 29, 2009 at 04:09:23PM -0700, Michael Shadle wrote:
> >
> >> If so, is it enabled by default? How can I enable it?
> >
> > If you mean SSL session reusing, then
> >
> > ssl_session_cache  shared:SSL:10m;
> >
> > Default is "ssl_session_cache none".
> >
> >
> > --
> > Igor Sysoev
> > http://sysoev.ru/en/
> >
> >

-- 
Igor Sysoev
http://sysoev.ru/en/