[Openvas-plugins] Parallelization of default_ssh_credentials.nasl

[Henri Doreau]

Hello,

I have noticed a consequent part of the duration of an authenticated
Full & Fast scan was due to default_ssh_credentials.nasl. The script
iterates through a list of 180 username/password couples and
sequentially attempts to use them to connect to the target.

In order to speedup the process, I've tried to load the
username/password list into KB and call get_kb_item() to retrieve each
item in a separate process (see the patch attached, not optimized). As
a result I would have expected to get four (my configuration)
concurrent processes connecting to the target. htop reveals that only
two are executed in parallel. I can't explain this behavior, at the
beginning of the scan I can clearly see four concurrent processes
(spawned by different NVTs). After a while
default_ssh_credentials.nasl is the only one still running, but with
two processes only.

Any idea what could be wrong or what I could be missing?

Regards.

-- 
Henri Doreau |  Greenbone Networks GmbH  |  http://www.greenbone.net
Neuer Graben 17, 49074 Osnabrueck, Germany | AG Osnabrueck, HR B 202460
Executive Directors: Lukas Grunwald, Dr. Jan-Oliver Wagner
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