IRC chat logs for #ltsp on irc.freenode.net (webchat)


Channel log from 16 March 2015   (all times are UTC)

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14:53
<callan>
hi everyone, is it possible to deny users of my LTSP network from logging into the router via SSH?
14:53
oops, i meant server, not router
14:55
<ogra_>
since the LTSP loin process is tied to ssh that would be quite difficult
14:55
*login
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15:25
<callan>
maybe this is more of a linux question but, say on one of my clients i SSH into the server with a regular account, i am finding that i can view files within non-readable directories
15:26
say i have /home/acct1/file.txt, and /home/acct1 has no user read access, but /home/acct1/file.txt DOES have read access, i can read it
15:26
<jammcq>
that's the 'execute' bit of permissions on the directory that you need to set
15:26
<callan>
within the thin client environment, i get permission denied, which i would expect, but when SSHing into the server, i can read it
15:26
<jammcq>
'execute' on a directory is 'search'
15:27
<callan>
i would like to deny reading of the files though
15:27
<ogra_>
debian (and by inheritance ubuntu) sets that by default on home dirs so people can share files easily
15:28
<callan>
yes, and i've changed that because i don't want that
15:28
<jammcq>
what are the perms on the directory?
15:28
<ogra_>
right, thats up to you :)
15:28
<callan>
751 right now
15:28
i was under the impression that if a directory is unreadable by a user, all files in that directory should also be unreadable
15:28
am i wrong there?
15:29
<jammcq>
are the other people in the same group?
15:30
0751 would be 'execute' for all
15:30
maybe 0750 would be more appropriate
15:31
S_IXUSR (00100) execute/search by owner ("search" applies for direcā€
15:31
tories, and means that entries within the directory
15:31
can be accessed)
15:31
<ogra_>
or even 0700 if you are paranoid :)
15:31
<jammcq>
that's the output of: man 2 chmod
15:31
S_IXGRP and S_IXOTH are the same way
15:32
<callan>
ok if i change the file to 750 it seems to work the way i want
15:32
<jammcq>
yeah, that's what I'd expect
15:32
<callan>
so i guess what i'm confused about is what the point of the read permission is if i can "execute" a text file
15:33
<jammcq>
read perms on a directory? or on a flat file?
15:33
<callan>
on a file, say a text file
15:33
<jammcq>
read and execute are 2 different things.
15:33
not all flat files are executable
15:34
<callan>
here's my example
15:35
so if i set "/home/acct1" to 751, i can read test.txt using "vim /home/acct1/test.txt"
15:35
with another account that has no group or owner relation
15:35
<jammcq>
yes, because the DIRECTORY has the execute bit set
15:35
meaning they can access files in that directory
15:36
<callan>
hmm ok
15:36
<jammcq>
but they probably can't do a 'ls -l' on it
15:36
<callan>
that's right
15:36
ok i think i've got it straight in my head now, thanks for your help
15:36
<jammcq>
so they can't get a listing of what's in the directory, but if they know the pathname, they can access files in the directory
15:37
no prob
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18:36
<slige>
HI - we're running LTSP on Edubuntu 12.04. Just moved to amd64 fm i386. Now in clients, get "printing service not available." in system setting/printing. Pointers for fixing please?
18:38
<vagrantc>
how did you move from i386 to amd64? reinstall?
18:41
<slige>
Edubuntu was already 64-bit. Did 64-bit LTSP commands and updated DHCP server to point to amd64 files. Clients boot fine - run apps, etc. Server has three printers installed.
18:46
<highvoltage>
slige: do you know how your printing was set up? did you perhaps have cups installed in your old think client chroot that's not there anymore? or was there something specified in the old lts.conf?
18:49
<slige>
I copied lts.conf to amd64 location (no printing stuff in it). Let's assume I've completely forgotten how I set up server in 2012. CUPS is in chroot (checked). How to fire it up in client?
18:51
<highvoltage>
check /etc/cups/cups.conf on the old chroot and compare
18:52
(also on old server if applicable)
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18:58
<gothaggis>
hello, i am having a problem - i am using active directory auth w/ ubuntu 14.04 ltsp server. i can ssh into the server using AD username/password no problem, however if I boot up a thin client, and use that same username/password, it just says "No Response from Server: Restarting" any ideas?
18:58
i'm using winbind/samba for ADauth
19:00
and i don't even see an attempt to login in /var/log/auth.log
19:00
<alkisg>
!screen_02
19:00
<ltsp`>
screen_02: To get a root shell on an Ubuntu thin client: https://help.ubuntu.com/community/UbuntuLTSP/ClientTroubleshooting#Using_a_shell_SCREEN
19:00
<alkisg>
Try ssh user@server from there
19:00
Change user, keep server exactly as "server", don't use another hostname or ip
19:04
slige: thin or fat clients? thin clients don't need cups in the chroot unless you're using localapps
19:06
<gothaggis>
alkisg i am able to ssh using the shell screen without a problem
19:06
<alkisg>
gothaggis: what was the exact command that you used?
19:07
<gothaggis>
if i go back to the gui, it still does the 'no reponse from server' thing
19:07
<alkisg>
Also, did you get a prompt to accept the keys?
19:07
<gothaggis>
oh wait
19:07
<slige>
(blink) I have no /etc/cups in old chroot. I'm surprised. Thanks for the pointers - I'll be back tomorrow if I can't get it.
19:07
<gothaggis>
the command i used was ssh username@thinclientserver
19:07
<alkisg>
Don't use thinclientserver, use server
19:08
<slige>
thin clients. Hmmm - new chroot has cups in chroot.
19:08
<alkisg>
It shouldn't matter anyway, the session is in the server
19:08
<gothaggis>
ahhhhhh
19:09
if i do that, it says connect to host server 22 connection refused
19:09
<alkisg>
That's a good place to start troubleshooting :)
19:09
<gothaggis>
i bet my lts.conf is not correct
19:09
thanks ;)
19:09
<alkisg>
getltscfg -a, cat /etc/hosts etc on the client
19:09
There's LDM_SERVER=xxx in lts.conf if you need it
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19:13
<slige>
thanks for your ideas. Back another day.
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