Package: x2goserver Severity: serious
Hi,
my understanding of the x2goadmin code [code], end of sub add_user, is that the code tries to write the sql password in users homes. This will fail for installations that have the user homes on NFS with the option "rootsquash" mounted.
I set the severity to "serious" because I imagine that this is a rather common scenario.
Also, this approach has another problem: Imagine you want to give access to the unix group "staff"? According to the documentation, you can use the options "--addgroup" and "--rmgroup" for this. What if a new employee joins the company later and wants to use x2go? In this case you need to call x2godbadmin for this new user again, which is suboptimal.
Is there really no way to get around generated user passwords?
[code] http://code.x2go.org/gitweb?p=x2goserver.git;a=blob;f=x2goserver/sbin/x2godb...
-- regards, Reinhard
Hi Reinhard,
On So 15 Dez 2013 01:13:35 CET, Reinhard Tartler wrote:
Package: x2goserver Severity: serious
Hi,
my understanding of the x2goadmin code [code], end of sub add_user, is that the code tries to write the sql password in users homes. This will fail for installations that have the user homes on NFS with the option "rootsquash" mounted.
I set the severity to "serious" because I imagine that this is a rather common scenario.
Also, this approach has another problem: Imagine you want to give access to the unix group "staff"? According to the documentation, you can use the options "--addgroup" and "--rmgroup" for this. What if a new employee joins the company later and wants to use x2go? In this case you need to call x2godbadmin for this new user again, which is suboptimal.
Is there really no way to get around generated user passwords?
[code]
http://code.x2go.org/gitweb?p=x2goserver.git;a=blob;f=x2goserver/sbin/x2godb...
I install x2goserver on the file servers and run x2godbadmin there
daily in a cron job.
If you have distributed file servers, one should test for the $HOME to
be accessible in x2godbadmin.
If needed, we could split out x2godbadmin from the x2goserver package
and provide it as a standalone package.
As this is a workaround and not a solution to your question above,
let's see if Alex has a comment on this.
Mike
DAS-NETZWERKTEAM mike gabriel, herweg 7, 24357 fleckeby fon: +49 (1520) 1976 148
GnuPG Key ID 0x25771B31 mail: mike.gabriel@das-netzwerkteam.de, http://das-netzwerkteam.de
freeBusy: https://mail.das-netzwerkteam.de/freebusy/m.gabriel%40das-netzwerkteam.de.xf...
On Mon, Dec 16, 2013 at 2:34 AM, Mike Gabriel <mike.gabriel@das-netzwerkteam.de> wrote:
I install x2goserver on the file servers and run x2godbadmin there daily in a cron job.
If you have distributed file servers, one should test for the $HOME to be accessible in x2godbadmin.
What to do if it isn't accesible? Then the user won't get a password to access the postgres, and x2godbadmin will fail silently. That's even worse!
If needed, we could split out x2godbadmin from the x2goserver package and provide it as a standalone package.
I don't see any benefit in doing so other than moving the problem around instead of solving it.
Cheers,
-- regards, Reinhard
On 13-12-16 08:49, Mike Gabriel <mike.gabriel@das-netzwerkteam.de> wrote:
Hi Reinhard,
On So 15 Dez 2013 01:13:35 CET, Reinhard Tartler wrote:
Package: x2goserver Severity: serious
Hi,
my understanding of the x2goadmin code [code], end of sub add_user, is that the code tries to write the sql password in users homes. This will fail for installations that have the user homes on NFS with the option "rootsquash" mounted.
I set the severity to "serious" because I imagine that this is a rather common scenario.
Also, this approach has another problem: Imagine you want to give access to the unix group "staff"? According to the documentation, you can use the options "--addgroup" and "--rmgroup" for this. What if a new employee joins the company later and wants to use x2go? In this case you need to call x2godbadmin for this new user again, which is suboptimal.
Is there really no way to get around generated user passwords?
There is a way that could work: If configured correctly, postgresql can use GSSAPI (Kerberos) Authentication. That way, the user is authenticated using his login ticket cache which is created anyways. If necessary, one could also provide a keyfile for the cleanup-cronjob so that it can at least access the database with sufficient permissions.
But I have never tried this with x2go and don't know if it would work.
Ciao,
Alexander Wuerstlein.
On Dec 16, 2013 8:59 AM, "Alexander Wuerstlein" < snalwuer@cip.informatik.uni-erlangen.de> wrote:
On 13-12-16 08:49, Mike Gabriel <mike.gabriel@das-netzwerkteam.de> wrote:
Hi Reinhard,
On So 15 Dez 2013 01:13:35 CET, Reinhard Tartler wrote:
Package: x2goserver Severity: serious
Hi,
my understanding of the x2goadmin code [code], end of sub add_user, is that the code tries to write the sql password in users homes. This will fail for installations that have the user homes on NFS with the option "rootsquash" mounted.
I set the severity to "serious" because I imagine that this is a rather common scenario.
Also, this approach has another problem: Imagine you want to give access to the unix group "staff"? According to the documentation, you can use the options "--addgroup" and "--rmgroup" for this. What if a new employee joins the company later and wants to use x2go? In this case you need to call x2godbadmin for this new user again, which is suboptimal.
Is there really no way to get around generated user passwords?
There is a way that could work: If configured correctly, postgresql can use GSSAPI (Kerberos) Authentication. That way, the user is authenticated using his login ticket cache which is created anyways. If necessary, one could also provide a keyfile for the cleanup-cronjob so that it can at least access the database with sufficient permissions.
That would be an option if you are OK to break passwordless ssh key authentication logins.
If you really wanted to go the kerberos route, you would have to create special db principals that can only access the db, and stash a passwordless keyfile in the users home.
But I have never tried this with x2go and don't know if it would work.
Ciao,
Alexander Wuerstlein.
-
Alexander Wuerstlein -
Mike Gabriel -
Reinhard Tartler