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Operating Systems Linux Red Hat Winbind and pam - restrict all services except for samba access Post 302594727 by klyne on Wednesday 1st of February 2012 04:47:51 AM
Old 02-01-2012
Winbind and pam - restrict all services except for samba access

Hi,

I have recently taken control of a number of RHEL5.3 servers that have samba shares setup on them and are authenticating using pam and winbind. My issue is that any user that has an active directory account can currently log in to the linux boxes using their ad credentials. I need to restrict all services except for samba access.

As a test to try and disable ssh I have tried adding the below line to /etc/pam.d/sshd but this has had the effect of stopping all new ssh connections. I hav also created the /etc/ssh_allow.pamlist file with the list of users that require access:

Code:
 
auth       required   pam_listfile.so onerr=fail item=user sense=allow file=/etc/ssh_allow.pamlist


/etc/pam.d/sshd

Code:
 
#%PAM-1.0
#auth       required   pam_listfile.so onerr=fail item=user sense=allow file=/etc/ssh_allow.pamlist
auth       include      system-auth
account    required     pam_nologin.so
account    include      system-auth
password   include      system-auth
session    optional     pam_keyinit.so force revoke
session    include      system-auth
session    required     pam_loginuid.so

/etc/pam.d/system-auth-ac
Code:
 
auth required /lib/security/$ISA/pam_env.so
auth sufficient /lib/security/$ISA/pam_unix.so likeauth nullok
auth sufficient /lib/security/$ISA/pam_winbind.so use_first_pass
auth required /lib/security/$ISA/pam_deny.so
account required /lib/security/$ISA/pam_unix.so
account sufficient /lib/security/$ISA/pam_succeed_if.so uid < 100 quiet
account sufficient /lib/security/$ISA/pam_winbind.so use_first_pass
account required /lib/security/$ISA/pam_permit.so
password requisite /lib/security/$ISA/pam_cracklib.so retry=3 type=
password sufficient /lib/security/$ISA/pam_unix.so nullok use_authtok md5 shadow
password sufficient /lib/security/$ISA/pam_winbind.so use_first_pass
password required /lib/security/$ISA/pam_deny.so
session required /lib/security/$ISA/pam_limits.so
session required /lib/security/$ISA/pam_unix.so
session required /lib/security/$ISA/pam_winbind.so use_first_pass

Any help would be greatly appreciated.

Thanks,
Keith
 

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TDBBACKUP(1M)						    System Administration tools 					     TDBBACKUP(1M)

NAME
tdbbackup - tool for backing up and for validating the integrity of samba .tdb files SYNOPSIS
tdbbackup [-s suffix] [-v] [-h] DESCRIPTION
This tool is part of the samba(1) suite. tdbbackup is a tool that may be used to backup samba .tdb files. This tool may also be used to verify the integrity of the .tdb files prior to samba startup or during normal operation. If it finds file damage and it finds a prior backup the backup file will be restored. OPTIONS
-h Get help information. -s suffix The -s option allows the adminisistrator to specify a file backup extension. This way it is possible to keep a history of tdb backup files by using a new suffix for each backup. -v The -v will check the database for damages (currupt data) which if detected causes the backup to be restored. COMMANDS
GENERAL INFORMATION The tdbbackup utility can safely be run at any time. It was designed so that it can be used at any time to validate the integrity of tdb files, even during Samba operation. Typical usage for the command will be: tdbbackup [-s suffix] *.tdb Before restarting samba the following command may be run to validate .tdb files: tdbbackup -v [-s suffix] *.tdb Samba .tdb files are stored in various locations, be sure to run backup all .tdb file on the system. Important files includes: o secrets.tdb - usual location is in the /usr/local/samba/private directory, or on some systems in /etc/samba. o passdb.tdb - usual location is in the /usr/local/samba/private directory, or on some systems in /etc/samba. o *.tdb located in the /usr/local/samba/var directory or on some systems in the /var/cache or /var/lib/samba directories. VERSION
This man page is correct for version 3.0 of the Samba suite. AUTHOR
The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open Source project similar to the way the Linux kernel is developed. The tdbbackup man page was written by John H Terpstra. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+----------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+----------------------+ |Availability | SUNWsmbar, SUNWsmbau | +--------------------+----------------------+ |Interface Stability | External | +--------------------+----------------------+ NOTES
Source for Samba is available on http://opensolaris.org. Samba(7) delivers the set of four SMF(5) services as can be seen from the following example: $ svcs samba wins winbind swat STATE STIME FMRI disabled Apr_21 svc:/network/samba:default disabled Apr_21 svc:/network/winbind:default disabled Apr_21 svc:/network/wins:default disabled Apr_21 svc:/network/swat:default where the services are: "samba" runs the smbd daemon managing the CIFS sessions "wins" runs the nmbd daemon enabling the browsing (WINS) "winbind" runs the winbindd daemon making the domain idmap "swat" Samba Web Administration Tool is a service providing access to browser-based Samba administration interface and on-line documentation. The service runs on software loopback network interface on port 901/tcp, i.e. opening "http://localhost:901/" in browser will access the SWAT service on local machine. Please note: SWAT uses HTTP Basic Authentication scheme where user name and passwords are sent over the network in clear text. In the SWAT case the user name is root. Transferring such sensitive data is advisable only on the software loopback network interface or over secure networks. Samba 3.0 01/19/2009 TDBBACKUP(1M)
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