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Old 02-21-2006, 08:21 AM   #1
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Samba --> nobody run "add user script = /usr/sbin/useradd ....." ??!!


I have the following configuration:

Two PDCs with Fedora Core 4: PDC1 and PDC2.

PDC1 trusts PDC2, respectively PDC2 is trusted to PDC1.
I join an XP workstation to PDC2. After restart i can see both domains in the login screen domain combo box.
I can logon to PDC2 , but not to PDC1, since the PDC2's /etc/passwd lacks the username from PDC1 i am trying to log in with. To correct this i edit smb.conf adding this line:

add user script = /usr/sbin/useradd %u -g users -s /bin/false -d /dev/null

After another unsuccessful login to PDC1 (with username ivan for example) in the PDC2's log (/var/log/samba/winxp.log) can be seen the following lines:

useradd: unable to lock password file
useradd ....gave 1

When i try to access a share on PDC2 with a PDC1 user (ivan for example), useradd is executed successfully, and user ivan is added to /etc/passwd.

I found out that during login "add user script = /usr/sbin/useradd %u ......" is executed with user nobody, and this user has no right to execute useradd, hence an error occurs.

After that i added user nobody in the /etc/sudoers so he could execute sudo on PDC2:

visudo -f sudoers
%nobody ALL=/usr/sbin/useradd

And edited smb.conf on PDC2 like this:

add user script = sudo -u root /usr/sbin/useradd %u ......

Now the logging to PDC1 works fine, but this is not normal!

My question is:
Is this a bug in samba, why when mapping a drive useradd runs as root (as described in the samba manual), but when logging, it runs as user nobody who has no right to execute useradd?

If am wrong - correct me, or point me to another solution.

Thanks in advance :-)
Old 02-23-2006, 04:54 AM   #2
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Please do not post the same thread in more than one forum. Picking the most relevant forum and posting it once there makes it easier for other members to help you and keeps the discussion all in one place.

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