[Nagiosplug-devel] [ nagiosplug-Bugs-3066166 ] check_http fails to connect to some SSL servers/devices

[SourceForge.net]

Bugs item #3066166, was opened at 2010-09-14 15:27
Message generated for change (Comment added) made by rabinnh
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=397597&aid=3066166&group_id=29880

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: General plugin execution
Group: None
>Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: rabinnh (rabinnh)
Assigned to: Nobody/Anonymous (nobody)
Summary: check_http fails to connect to some SSL servers/devices

Initial Comment:
Error is "CRITICAL - Cannot make SSL connection"

This has repeatedly been reported an closed for different servers; i.e. Tomcat, Oracle AppServer, etc.  I can still see the issue on some access points that I have.

I debugged through the code and the problem and solution are simple;in "ssltuils.c" in the function "int np_net_ssl_init_with_hostname", is the following line of code:

if ((c = SSL_CTX_new (SSLv23_client_method ())) == NULL) {

If this call fails, the error is returned.  However, on systems that fail, falling back to TLS works fine, for example:

if ((c = SSL_CTX_new (TLSv1_client_method ())) == NULL) {

sslutil.c should attempt both methods




----------------------------------------------------------------------

>Comment By: rabinnh (rabinnh)
Date: 2010-09-27 10:37

Message:
Version 1.4.15.  Previous causes may have been fixed, but not the one that
I identified.  I have attached the patch to sslutils.c to fallback to TLS
if SSL doesn't work.

FWIW, in other cases, I changed the command configuration to use just the
IP address instead of host headers.
-I 
instead of
-H 

----------------------------------------------------------------------

Comment By: Thomas Guyot-Sionnest (dermoth)
Date: 2010-09-27 08:27

Message:
Thanks for your bug report. Which version of the nagios-plugins are you
using? I believe this has been fixed in 1.4.15.

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=397597&aid=3066166&group_id=29880