IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 1 November 2016 (all times are UTC)
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| 12:52 | <al-geo> cyberorg please help. i am trying to rum gui program on startup but not successfully. http://paste.opensuse.org/18086903 its info what i think help you to understand problem
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| 12:53 | line 4 in http://paste.opensuse.org/18086903 is false
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| 19:45 | <MRH2> Hi I am trying to unlock a screen that is running mdm/cinnamon 3 on a fat client - it was suggested i try LDM_PASSWORD_HASH=true
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| 19:46 | but doesn;t seem to work
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| 19:46 | cinnamon is using pam to authenticate
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| 19:47 | and the option in the config file (on cinnamon) is PamStack=mdm
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| 19:48 | should it be something else?
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| 20:12 | <vagrantc> no idea what mdm is
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| 20:19 | <MRH2> copy of gdm afaik
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| 20:20 | like in gnome gdm.conf where u have PamStack=gdm
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| 21:02 | <MRH2> where is it possible to find more info about LDM_PASSWORD_HASH
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| 21:15 | <quinox> man lts.conf
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| 21:15 | LDM_PASSWORD_HASH
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| 21:16 | boolean, default False
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| 21:16 | When set to True, this will create a proper shadow entry on the client, allowing for screen locking, and other things which require authentication to work. Note, this allows you to
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| 21:16 | change your password locally, or possibly other actions such as sudo, but these changes are only temporary and will not persist on reboot.
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| 21:16 | versions: LDM 2.2.14+, LTSP 5.5.2+
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| 21:19 | for more documentation I think you'll have to reach the source
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| 21:27 | <MRH2> ok i think i got it
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| 21:27 | shadow is is only readable by group shadow
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| 21:28 | <vagrantc> that should definitely be very restrictive
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| 21:29 | the LDM code to update the password runs as root, so should be able to update it
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| 21:29 | !shell
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| 21:29 | <ltsp> I do not know about 'shell', but I do know about these similar topics: 'shell-screen', 'gnome-shell'
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| 21:29 | <vagrantc> !shell-screen | echo MRH2
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| 21:29 | <ltsp> MRH2 shell-screen: One way to get local root access to troubleshoot a thin client is to use a shell SCREEN: https://help.ubuntu.com/community/UbuntuLTSP/ClientTroubleshooting#Using%20a%20shell%20SCREEN
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| 21:41 | <MRH2> thanks
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| 21:41 | ok i can read /etc/shadow
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| 21:41 | i can see the entry for the logged in user that wa added
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| 21:42 | now how does the - let's say gnome 3 - screen lock authenticate against it
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| 21:43 | <vagrantc> probably /etc/pam.d/common-auth
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| 21:43 | which is probably included by an application specific file in /etc/pam.d/
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| 21:44 | and pam_unix in common-auth is probably what it should be authenticating against
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| 21:44 | it's been a while since i've disected the pam stack enough to remember off the top of my head
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| 21:52 | <MRH2> thanks
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| 21:55 | <alkisg_web> MRH2: try `su - username`, if you can authenticate with su, then the screensaver should also work
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| 21:55 | Note that ltsp doesn't support any other display managers than LDM, so you're probably *not* using MDM
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| 21:56 | <MRH2> ok so what happens to all the gnome config files that say gdm
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| 21:57 | <alkisg_web> For example?
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| 21:59 | <MRH2> i was trying to mess around with a local gdm.conf file for example
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| 21:59 | but guess that is just not used
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| 21:59 | <alkisg_web> Since gdm isn't running, which app will read gdm.conf, wherever that is?
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| 22:01 | <MRH2> i was trying to figure out where the screen lock is getting it from
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| 22:02 | <alkisg_web> It should be pam's common-auth
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| 22:02 | Does the `su` command work?
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| 22:02 | <MRH2> yep
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| 22:03 | just not the screenlock
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| 22:03 | <alkisg_web> And screensaver unlocking doesn't work? That's strange
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| 22:03 | Which screensaver is that? ps aux|grep screen
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| 22:08 | <MRH2> cinnamon-screensaver and cinnamon-screensaver-dialog
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| 22:09 | <alkisg_web> Btw, verify that mdm/gdm are not running, while ldm is... right?
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| 22:16 | <vagrantc> MRH2: this is on linux mint, if i recall?
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| 22:28 | <MRH2> yep almost there except for the screen locking
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| 22:29 | mdm is also running
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| 22:32 | with xorg and the greeter login
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| 22:32 | everything else is running under ldm
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| 22:39 | <MRH2> and separate xorg process
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| 22:44 | etc/pam.d/cinnamon-screensaver has @include common-auth
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| 22:48 | <MRH2> do i need to @include common-session ?
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| 22:52 | <vagrantc> you might want to look at /var/log/auth.log or other related logs on the client
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| 22:52 | after attempting to login with the screensaver
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| 23:37 | <MRH2> mdm display manager was a service inherited from the server image i'll add it to the list of excludes (doesn't seem to relate to this though)
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| 23:37 | i'l check that log s suggested :)
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