re: SSL related DoS

2011-04-18 Thread Nick Gearls
there doesn't seem to be any immediate demand for renegotiation support, so it makes the most sense to leave it optional-to-enable rather than optional-to-disable. If you want to protect some parts of your site with client authentication, then you need to enable insecure renegotiation to

Re: SSL related DoS

2011-04-17 Thread Stefan Fritsch
On Sat, 16 Apr 2011, Eric Covener wrote: would mod_reqtimeout step in after too many renegotiations had eaten too much wall time? Whenever mod_ssl reads data from the client, mod_reqtimeout will check the configured timeouts. It is possible that the data sent during reneg may prevent the

Re: SSL related DoS

2011-04-17 Thread Jeff Trawick
On Sat, Apr 16, 2011 at 3:39 PM, Daniel Ruggeri drugg...@primary.net wrote: On 4/16/2011 11:52 AM, Chris Hill wrote: Dear Apache httpd dev list, ... The reason why I insist in this is that the world has come to depend on HTTP/SOAP over SSL (and Apache/OpenSSL are probably the most popular

Re: SSL related DoS

2011-04-17 Thread Chris Hill
Yes, disabled by default now. My point was just make sure it did not come back again, at least not without a config parameter to easily disable/enable. On Sun, Apr 17, 2011 at 8:41 AM, Jeff Trawick traw...@gmail.com wrote: On Sat, Apr 16, 2011 at 3:39 PM, Daniel Ruggeri drugg...@primary.net

Re: SSL related DoS

2011-04-17 Thread Chris Hill
Bill, that is already good, but then the question still remains of whether there is something that can be done disable/control/detect too many handshakes from any given client (new or renegotiated). I'd love to understand whether this is even a reasonable thing discuss, as I do not have knowledge

Re: SSL related DoS

2011-04-16 Thread Daniel Ruggeri
On 4/16/2011 11:52 AM, Chris Hill wrote: Dear Apache httpd dev list, ... The reason why I insist in this is that the world has come to depend on HTTP/SOAP over SSL (and Apache/OpenSSL are probably the most popular implementation) for business critical apps, yet, it is not clear how these

Re: SSL related DoS

2011-04-16 Thread William A. Rowe Jr.
On 4/16/2011 2:39 PM, Daniel Ruggeri wrote: On 4/16/2011 11:52 AM, Chris Hill wrote: but how can I ensure this will never be turned back on in future releases given the lack of configuration parameters? Chris; I believe this topic (enable/disable renegotiation) was brought up on this

Re: SSL related DoS

2011-04-16 Thread Eric Covener
would mod_reqtimeout step in after too many renegotiations had eaten too much wall time?

Re: SSL related DoS

2011-04-16 Thread Erwann ABALEA
2011/4/16 Chris Hill chris.hill...@gmail.com: [...] SSL handshakes take more processing power in the server side than on the client side (some commented in the order of 15x more). This is great news for attackers who want to take down a site and the work has already be done for them through