[Samba] Is “obey pam restrictions” still supposed to work in Samba 4?
chentaocredungtao at yahoo.com
Wed Feb 10 21:03:12 UTC 2021
The up-to-date Samba doc says
"When Samba 3.0 is configured to enable PAM support (i.e. --with-pam),
this parameter will control whether or not Samba should obey PAM's
account and session management directives."
Is this still supposed to work with Samba 4 ? I had some strange result,
it seems PAM's restrictions are enforced once, but then not anymore.
I tried to set up a file-size limitation on a Samba share. I'm not
talking about quotas, I'm talking about preventing users from storing
files that are bigger than 100MB, for example. I used
/etc/security/limits.conf for this.
It almost works. Well, it works the first time a user tries to create a
file, and then not anymore.
Here's what I did :
- First I defined a hard filesize limit of 100MB for user johndoe
in /etc/security/limits.conf : "johndoe hard fsize 102400"
- Then I added "session required pam_limits.so" to
/etc/pam.d/samba, in order to tell PAM to enforce the limitations
- And finally, I added "obey pam restrictions = yes" to
At first it seemed promising, when user johndoe tries to copy a file >
100MB, a Windows 10 client throws the following error : An unexpected
error is keeping you from copying the file...An unexpected network error
So far, so good ! That's what I wanted, prevent the user to store a file
But if I click on "Try again", the file is copied anyway.
And if I then try to copy more files > 100MB, no more error message is
thrown, and the copies proceed.
If user johndoe logs out and back in, same result : the first attempt
throws an error, the following attempts succeed.
So, it seems the restriction I set in /etc/security/limits.conf is only
enforced at the first attempt, and is no more enforced afterwards.
Any idea why ? Or any idea how I could achieve my goal (prevent a user
to copy a file > 100MB) ?
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