gmane.comp.security.openwall.john.user

Re: JtR OpenCL - AMD GPU not listed

NeonFlash — 2013-05-23T15:45:09

Hi Alexander,

Thanks. It was working for me as per your suggestion, to set the XAUTHORITY environment variable. Apparently this message went out to the mailing list a little later though I sent it before my issue was resolved )

________________________________
 From: Solar Designer <solar-cxoSlKxDwOJWk0Htik3J/w< at >public.gmane.org>
To: john-users-ZwoEplunGu1jrUoiu81ncdBPR1lH4CV8< at >public.gmane.org 
Sent: Thursday, May 23, 2013 1:48 AM
Subject: Re: [john-users] JtR OpenCL - AMD GPU not listed

On Wed, May 22, 2013 at 01:11:30PM -0700, NeonFlash wrote:

As discussed, this is not supposed to work.  You must not enable X forwarding.

This is supposed to work, but you need to set XAUTHORITY as I mentioned
to you in another reply.  Have you tried that?

Yes, but you may set XAUTHORITY to get around this issue.

You may.  Then you won't need to set XAUTHORITY manually.

Alexander

Re: disabling retrieval of cracked passwords

RB — 2013-05-23T13:06:20


Not that I'm aware of.  You could destroy the .pot and just use the .log as
your "evidence", but the passwords will still hit storage, however
temporarily.  Perhaps link john.pot to /dev/null?

disabling retrieval of cracked passwords

Royce Williams — 2013-05-23T04:18:47

Can JtR be run in such a way that the results show that a password was
cracked, but the cracked passwords themselves are not recorded?

--
Royce Williams

Re: How to limit the number of guesses?

Solar Designer — 2013-05-22T21:12:10

No, but:


This is the way to go.  Here's an example:

[List.External:Status50G]
int n, m;

void init()
{
n = m = 0;
}

void filter()
{
if (++n < 1000000000)
return;
n = 0;
status = ++m % 50 == 0;
abort = m >= 1000;
}

This prints the status line after every 50G candidates, and terminates
after 1000G (10^12) candidates.

Alexander

Re: How to limit the number of guesses?

Rafael Veras — 2013-05-22T21:07:22

Very useful!

Is it possible to use both externals simultaneously?

I guess I could just merge them in a custom external as the code is very
simple...

Rafael



On Mon, May 20, 2013 at 5:23 PM, Solar Designer <solar-cxoSlKxDwOJWk0Htik3J/w< at >public.gmane.org> wrote:

Re: JtR OpenCL - AMD GPU not listed

NeonFlash — 2013-05-22T20:26:05

Thanks. I understood the concept of X11 forwarding now.

________________________________
 From: magnum <john.magnum-revL73yDgGBWk0Htik3J/w< at >public.gmane.org>
To: john-users-ZwoEplunGu1jrUoiu81ncdBPR1lH4CV8< at >public.gmane.org 
Sent: Thursday, May 23, 2013 1:16 AM
Subject: Re: [john-users] JtR OpenCL - AMD GPU not listed

On 22 May, 2013, at 21:30 , NeonFlash <psykosonik_frequenz-/E1597aS9LQAvxtiuMwx3w< at >public.gmane.org> wrote:

X forwarding is not what you need (on the contrary, you need to turn it off). If you run "xeyes" from your prompt, that program should pop up on the remote screen, not on yours (which would be the case with X forwarding).

You need to use DISPLAY=:0 like Solar said, and the user owning the X session must grant you permissions to connect to it (or you need to log in to the same user account).

magnum

Re: JtR OpenCL - AMD GPU not listed

NeonFlash — 2013-05-22T20:25:14

Thanks a lot Alexander, it is working now :)

________________________________
 From: Solar Designer <solar-cxoSlKxDwOJWk0Htik3J/w< at >public.gmane.org>
To: john-users< at >lists.openwall.com 
Sent: Thursday, May 23, 2013 1:12 AM
Subject: Re: [john-users] JtR OpenCL - AMD GPU not listed

On Wed, May 22, 2013 at 12:30:48PM -0700, NeonFlash wrote:

Sorry, I gave you wrong advice.  What you actually need is to set the
XAUTHORITY environment variable to point to the ~user/.Xauthority file
for the user currently logged into the X desktop.  And that file must be
made readable to your user account.

Contrary to what you might expect, you must not use X11 forwarding in
order to be able to use the remote GPU.  With X11 forwarding, remote X
apps would talk to your local X server (over SSH), but to use the remote
GPU you actually want them to talk to the remote X server.

Luckily, the server-side X11 forwarding setting does not matter.  What
matters is your client-side X11 forwarding setting (if the server-side
setting

Re: JtR OpenCL - AMD GPU not listed

Solar Designer — 2013-05-22T20:18:30

As discussed, this is not supposed to work.  You must not enable X forwarding.


This is supposed to work, but you need to set XAUTHORITY as I mentioned
to you in another reply.  Have you tried that?


Yes, but you may set XAUTHORITY to get around this issue.


You may.  Then you won't need to set XAUTHORITY manually.

Alexander

Re: JtR OpenCL - AMD GPU not listed

NeonFlash — 2013-05-22T20:11:30

I have tried connecting to the Linux machine over SSH using the ssh command from linux as well.

ssh -X username< at ><IP address of remote machine>


ssh username< at ><IP address of remote machine>

In both the cases, clinfo does not detect GPU and fglrxinfo is unable to open the display.

Please note that I am connecting to the remote machine over SSH as a root user (PermitRootLogin is set to Yes in his sshd_config file). I know this is not secure, but he has provided me root access.

While he is logged into X as a different user. So, would it be a problem?

Should I login as the same user via SSH as the user who is logged into X locally?

I hope this will help in fixing the issue.

Thanks.



________________________________
 From: NeonFlash <psykosonik_frequenz-/E1597aS9LQAvxtiuMwx3w< at >public.gmane.org>
To: "john-users-ZwoEplunGu1jrUoiu81ncdBPR1lH4CV8< at >public.gmane.org" <john-users-ZwoEplunGu1jrUoiu81ncdBPR1lH4CV8< at >public.gmane.org> 
Sent: Thursday, May 23, 2013 1:00 AM
Subject: Re: [john-users] JtR OpenCL - AMD GPU

Re: JtR OpenCL - AMD GPU not listed

magnum — 2013-05-22T19:46:32

X forwarding is not what you need (on the contrary, you need to turn it off). If you run "xeyes" from your prompt, that program should pop up on the remote screen, not on yours (which would be the case with X forwarding).

You need to use DISPLAY=:0 like Solar said, and the user owning the X session must grant you permissions to connect to it (or you need to log in to the same user account).

magnum

Re: Fuzzing with regular expressions

Jan Starke — 2013-05-22T19:45:56

This is a really cool challenge, as flex only supports single byte
character sets (if not only ASCII). Their are some really weird approaches
throughout the web. Maybe I will take a look at it. Until, I changed the
spec to match the code ;-)



I updated the docs; thank you for the advice. The original approach of
using UTF-32 internally by default was driven by performance issues.
Handling UTF-32 is simpler than handling UTF-8. The current approach is
faster with UTF-8, which seems to be the better way...

Regards, Jan

Re: JtR OpenCL - AMD GPU not listed

Solar Designer — 2013-05-22T19:42:53

Sorry, I gave you wrong advice.  What you actually need is to set the
XAUTHORITY environment variable to point to the ~user/.Xauthority file
for the user currently logged into the X desktop.  And that file must be
made readable to your user account.


Contrary to what you might expect, you must not use X11 forwarding in
order to be able to use the remote GPU.  With X11 forwarding, remote X
apps would talk to your local X server (over SSH), but to use the remote
GPU you actually want them to talk to the remote X server.

Luckily, the server-side X11 forwarding setting does not matter.  What
matters is your client-side X11 forwarding setting (if the server-side
setting is enabled).  As I've explained above, to use the remote GPU you
must not use X11 forwarding (just do not enable it in your SSH client).

Alexander

Re: JtR OpenCL - AMD GPU not listed

NeonFlash — 2013-05-22T19:30:48

Hi,

Even after setting that environment variable, issue persists. I am still unable to see the GPU in the clinfo output.

I think the issue is related to connection over SSH. Because my friend is able to run oclHashcat-plus on the machine when he logs into the X. However, over SSH, the GPU is not connected.

I want to use JtR with OpenCL.

I checked the sshd_config file on the machine:

 cat /etc/ssh/sshd_config | grep "X11"
X11Forwarding yes
#X11DisplayOffset 10
#X11UseLocalhost yes
#       X11Forwarding no


X11Forwarding is set.

here is, fglrxinfo output (It does not detect the GPU either):

fglrxinfo
Error: unable to open display (null)


clinfo does not detect the GPU as well.

I am connecting to the machine over SSH using Putty over port 22. I  have checked the option, Enable X11 forwarding under SSH.

I found one more thread here related to a similar (but not the same issue):

http://devgurus.amd.com/thread/159348



________________________________
 From: Solar Designer <solar-cxoSlKxDwOJWk

Re: Fuzzing with regular expressions

magnum — 2013-05-22T19:00:18

This contradicts the Unicode section on http://code.google.com/p/rexgen/ so you might want to revise that. Or better, make the code work like the docs says :-)


OK, I see it now. This also contradicts the web docs: the default is UTF-8 and not UTF-32. And in this case the actual behavior is better - defaulting to UTF-32 would be very odd!

magnum

Re: JtR OpenCL - AMD GPU not listed

Solar Designer — 2013-05-22T18:41:26

Please try:

export DISPLAY=:0
clinfo

does it show the GPU now?

Alexander

Re: JtR OpenCL - AMD GPU not listed

NeonFlash — 2013-05-22T18:33:08

Hi Alexander,


I hope I have all the information you have asked:

1. clinfo does not list the GPU (and I am not sure why). Here are a few lines out of output from the clinfo command. It lists only the CPU and not the GPU.


No protocol specified
Number of platforms:                             1
  Platform Profile:                              FULL_PROFILE
  Platform Version:                              OpenCL 1.2 AMD-APP (938.2)
  Platform Name:                                 AMD Accelerated Parallel Processing
  Platform Vendor:                               Advanced Micro Devices, Inc.
  Platform Extensions:                           cl_khr_icd cl_amd_event_callback cl_amd_offline_devices


  Platform Name:                                 AMD Accelerated Parallel Processing
Number of devices:

Re: JtR OpenCL - AMD GPU not listed

magnum — 2013-05-22T18:18:03

Try to confirm that your GPU works outside of John the Ripper. For example, can you see it with "clinfo" (included with AMD drivers)?

magnum

Re: invitation to john-users team for PHDays Hash Runner contest 23-24 May

Aleksey Cherepanov — 2013-05-22T17:57:47

I successfully registered our team for participation in PHDays Hash
Runner 2013.

On Sun, May 19, 2013 at 04:02:04PM +0400, Aleksey Cherepanov wrote:

My guess was wrong: the contest "starts May,23 9:00(GMT+4) and lasts
for 48 hours. If less than 50% are cracked at the end, 12 hours will
be added" (via < at >repdet https://twitter.com/repdet - he is the main
organizer of hash runner).

You are welcome to participate!

Thanks!

Re: JtR OpenCL - AMD GPU not listed

Solar Designer — 2013-05-22T17:39:04

Does "clinfo" list the GPU?  Is the GPU configured in xorg.conf, and do
you have X running?  (It needs to be, and you should.)

The old workarounds that you found (OS_TIMER 0 and AMD APP SDK
downgrade) were for different issues and are irrelevant (besides,
1.7.9-jumbo-7 already includes a different workaround for the OS_TIMER
issue, so you should not bother).

Alexander

Re: JtR OpenCL - AMD GPU not listed

NeonFlash — 2013-05-22T17:26:19

Hi Lukas,

I have AMD-APP-SDK-v2.6-RC3-lnx64 installed.

Location: /usr/local/opencl/AMD-APP-SDK-v2.6-RC3-lnx64/

I read on the john-dev list that magnum suggested to downgrade from 2.6 to 2.5 version to resolve the issue. Looks like that did not solve the issue either.

Do you need this version information or some other? And how do I find the version information you have requested?

I am on OpenSUSE 11.4

Thanks.




________________________________
 From: Lukas Odzioba <lukas.odzioba-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org>
To: john-users-ZwoEplunGu1jrUoiu81ncdBPR1lH4CV8< at >public.gmane.org; NeonFlash <psykosonik_frequenz-/E1597aS9LQAvxtiuMwx3w< at >public.gmane.org> 
Sent: Wednesday, May 22, 2013 10:50 PM
Subject: Re: [john-users] JtR OpenCL - AMD GPU not listed
 

2013/5/22 NeonFlash <psykosonik_frequenz-/E1597aS9LQAvxtiuMwx3w< at >public.gmane.org>:

What catalyst version do you run?

Lukas

Re: JtR OpenCL - AMD GPU not listed

Lukas Odzioba — 2013-05-22T17:20:56

2013/5/22 NeonFlash <psykosonik_frequenz-/E1597aS9LQAvxtiuMwx3w< at >public.gmane.org>:

What catalyst version do you run?

Lukas