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Xris Brunton | 27 Jan 04:22

shisa seems to hang

Hi


I have just installed shishi on my Ubuntu server and every time I type any command in shisa other than 'shisa -V' or 'shisa -h' it just seems to hang and gives no response (verbose has been of no use either). It did this with the official Ubuntu packages and then also when they were removed and 0.34 compiled and installed. The shishi daemon is definitely runinng and I have been through all the instructions to no avail. Is this a bug or am I just doing something stupid.

OS = Ubuntu Gutsy
Kernel = 2.6.20-16
Shishi - 0.0.34

Regards

Xris



--
Give a man a fish, and you'll feed him for a day.
Teach a man to fish, and he'll buy a funny hat.
Talk to a hungry man about fish, and you're a consultant.
 - Scott Adams 
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Simon Josefsson | 31 Jan 10:39
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Re: shisa seems to hang

"Xris Brunton" <xris.brunton <at> gmail.com> writes:

> Hi
> I have just installed shishi on my Ubuntu server and every time I type any
> command in shisa other than 'shisa -V' or 'shisa -h' it just seems to hang
> and gives no response (verbose has been of no use either). It did this with
> the official Ubuntu packages and then also when they were removed and
> 0.34compiled and installed. The shishi daemon is definitely runinng
> and I have
> been through all the instructions to no avail. Is this a bug or am I just
> doing something stupid.

Hi!  Thanks for your interest.

I've seen that too, and the reason has been that a read from /dev/random
or /dev/urandom blocks.  Use 'strace shishi' to find out if this is
indeed the case.

It may also be blocking DNS requests, to find out the Kerberos server
for a poorly guessed domain.  Try 'shishi -v' to get some more
information on what Shishi is doing.  However, this should time out
relatively fast, whereas blocking /dev/*random may block for a long
time.

It has been suggested that applications should use a libgcrypt random
seeds file.  The Shishi command line tools could implement that, but I'm
less sure how it would work for a library.  More investigation is needed
here...

/Simon
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Xris Brunton | 3 Feb 10:08

Re: shisa seems to hang

Hi Simon


Thanks heaps for the response. Ran the strace and you were correct problem seems to be the blocking on /dev/random, /dev/urandom is fine (as you would expect seeing as it exists to avoid blocking issues). I can do a quick and dirty work around by deleting /dev/random and sym-linking /dev/random to /dev/urandom this will last until the machine is rebooted so I can add principals, keys, passwords etc.

Regards

Xris



On Jan 31, 2008 8:39 PM, Simon Josefsson <simon <at> josefsson.org> wrote:
"Xris Brunton" <xris.brunton <at> gmail.com> writes:

> Hi
> I have just installed shishi on my Ubuntu server and every time I type any
> command in shisa other than 'shisa -V' or 'shisa -h' it just seems to hang
> and gives no response (verbose has been of no use either). It did this with
> the official Ubuntu packages and then also when they were removed and
> 0.34compiled and installed. The shishi daemon is definitely runinng
> and I have
> been through all the instructions to no avail. Is this a bug or am I just
> doing something stupid.

Hi!  Thanks for your interest.

I've seen that too, and the reason has been that a read from /dev/random
or /dev/urandom blocks.  Use 'strace shishi' to find out if this is
indeed the case.

It may also be blocking DNS requests, to find out the Kerberos server
for a poorly guessed domain.  Try 'shishi -v' to get some more
information on what Shishi is doing.  However, this should time out
relatively fast, whereas blocking /dev/*random may block for a long
time.

It has been suggested that applications should use a libgcrypt random
seeds file.  The Shishi command line tools could implement that, but I'm
less sure how it would work for a library.  More investigation is needed
here...

/Simon



--
Give a man a fish, and you'll feed him for a day.
Teach a man to fish, and he'll buy a funny hat.
Talk to a hungry man about fish, and you're a consultant.
 - Scott Adams 
_______________________________________________
Help-shishi mailing list
Help-shishi <at> gnu.org
http://lists.gnu.org/mailman/listinfo/help-shishi
Permalink | Reply |

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