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#1 2017-02-01 06:51:35

quasifilmie
Member
Registered: 2011-10-27
Posts: 296

[SOLVED]Can change AD user passwords but can't login via su [winbind]

Hi guys, I have an active directory domain with one controller running server 2012. On my arch member server I have samba/winbind almost setup fully. I have joined the domain and I can list the users with getent passwd and the groups getent group. I have edited /etc/pam.d/system-auth as per the wiki but am stuck at the part where I login with my ad user. I can only login if I do sudo su or use su as root. When the AD user has to enter a password I get "authentication failed".

I have configured this with winbind/samba. I didn't use sssd or realmd at all.



Here is my /etc/pam.d/system-auth



#%PAM-1.0

auth [success=1 default=ignore] pam_localuser.so
auth [success=2 default=die] pam_winbind.so
auth [success=1 default=die] pam_unix.so nullok
auth      requisite pam_deny.so
auth      optional  pam_permit.so
auth      required  pam_env.so

account   required  pam_unix.so
account [success=1 default=ignore] pam_localuser.so
account required pam_winbind.so
account   optional  pam_permit.so
account   required  pam_time.so


password [success=1 default=ignore] pam_localuser.so
password [success=2 default=die] pam_winbind.so
password [success=1 default=die] pam_unix.so sha512 shadow
password requisite pam_deny.so
password  optional  pam_permit.so

session   required  pam_limits.so
session   required pam_mkhomedir.so skel=/etc/skel/ umask=0022
session   required  pam_unix.so
session [success=1 default=ignore] pam_localuser.so
session required pam_winbind.so
session   optional  pam_permit.so

Here is my /etc/pam.d/passwd

#%PAM-1.0
password	required	pam_cracklib.so difok=2 minlen=8 dcredit=2 ocredit=2 retry=3
#password	required	pam_unix.so sha512 shadow use_authtok
password include system-auth

Here is my smb.conf

#======================= Global Settings =====================================
[global]
	security = ADS
	workgroup = LEE
	realm = LEE.CORP

# server string is the equivalent of the NT Description field
#server string = Samba Server

# This option is important for security. It allows you to restrict
# connections to machines which are on your local network. The
# following example restricts access to two C class networks and
# the "loopback" interface. For more examples of the syntax see
# the smb.conf man page
;   hosts allow = 192.168.1. 192.168.2. 127.

# if you want to automatically load your printer list rather
# than setting them up individually then you'll need this
#   printcap name = /etc/printcap
#  load printers = yes

# It should not be necessary to spell out the print system type unless
# yours is non-standard. Currently supported print systems include:
# bsd, sysv, plp, lprng, aix, hpux, qnx
;   printing = bsd

# Uncomment this if you want a guest account, you must add this to /etc/passwd
# otherwise the user "nobody" is used
;  guest account = pcguest

# this tells Samba to use a separate log file for each machine
# that connects
   log file = /var/log/samba/%m.log
   log level = 1
# Put a capping on the size of the log files (in Kb).
   max log size = 50



idmap config * : backend = tdb
idmap config * : range = 3000-7999
idmap config LEE : backend = rid
idmap config LEE : range = 10000-999999

winbind nss info = template
template shell = /bin/bash
template homedir = /home/%U

winbind nss info = rfc2307
winbind use default domain = yes
winbind enum users = yes
winbind enum groups = yes
winbind nested groups = yes
winbind separator = +
winbind refresh tickets = yes
winbind offline logon = yes
winbind cache time = 300

# Security mode. Most people will want user level security. See
# security_level.txt for details.
#   security = user
# Use password server option only with security = server
;   password server = <NT-Server-Name>

# Password Level allows matching of _n_ characters of the password for
# all combinations of upper and lower case.
;  username level = 8

# You may wish to use password encryption. Please read
# ENCRYPTION.txt, Win95.txt and WinNT.txt in the Samba documentation.
# Do not enable this option unless you have read those documents
;  encrypt passwords = yes
;  smb passwd file = /etc/samba/smbpasswd

# The following are needed to allow password changing from Windows to
# update the Linux sytsem password also.
# NOTE: Use these with 'encrypt passwords' and 'smb passwd file' above.
# NOTE2: You do NOT need these to allow workstations to change only
#        the encrypted SMB passwords. They allow the Unix password
#        to be kept in sync with the SMB password.
;  unix password sync = Yes
;  passwd program = /usr/bin/passwd %u
;  passwd chat = *New*UNIX*password* %n\n *ReType*new*UNIX*password* %n\n *passwd:*all*authentication*tokens*updated*successfully*

# Unix users can map to different SMB User names
;  username map = /etc/samba/smbusers

# Using the following line enables you to customise your configuration
# on a per machine basis. The %m gets replaced with the netbios name
# of the machine that is connecting
;   include = /etc/samba/smb.conf.%m

# Configure Samba to use multiple interfaces
# If you have multiple network interfaces then you must list them
# here. See the man page for details.
;   interfaces = 192.168.12.2/24 192.168.13.2/24 

# Configure remote browse list synchronisation here
#  request announcement to, or browse list sync from:
#	a specific host or from / to a whole subnet (see below)
;   remote browse sync = 192.168.3.25 192.168.5.255
# Cause this host to announce itself to local subnets here
;   remote announce = 192.168.1.255 192.168.2.44

# Browser Control Options:
# set local master to no if you don't want Samba to become a master
# browser on your network. Otherwise the normal election rules apply
;   local master = no

# OS Level determines the precedence of this server in master browser
# elections. The default value should be reasonable
;   os level = 33

# Domain Master specifies Samba to be the Domain Master Browser. This
# allows Samba to collate browse lists between subnets. Don't use this
# if you already have a Windows NT domain controller doing this job
;   domain master = yes 

# Preferred Master causes Samba to force a local browser election on startup
# and gives it a slightly higher chance of winning the election
;   preferred master = yes

# Use only if you have an NT server on your network that has been
# configured at install time to be a primary domain controller.
;   domain controller = <NT-Domain-Controller-SMBName>

# Enable this if you want Samba to be a domain logon server for 
# Windows95 workstations. 
;   domain logons = yes

# if you enable domain logons then you may want a per-machine or
# per user logon script
# run a specific logon batch file per workstation (machine)
;   logon script = %m.bat
# run a specific logon batch file per username
;   logon script = %U.bat

# Where to store roving profiles (only for Win95 and WinNT)
#        %L substitutes for this servers netbios name, %U is username
#        You must uncomment the [Profiles] share below
;   logon path = \\%L\Profiles\%U

# All NetBIOS names must be resolved to IP Addresses
# 'Name Resolve Order' allows the named resolution mechanism to be specified
# the default order is "host lmhosts wins bcast". "host" means use the unix
# system gethostbyname() function call that will use either /etc/hosts OR
# DNS or NIS depending on the settings of /etc/host.config, /etc/nsswitch.conf
# and the /etc/resolv.conf file. "host" therefore is system configuration
# dependant. This parameter is most often of use to prevent DNS lookups
# in order to resolve NetBIOS names to IP Addresses. Use with care!
# The example below excludes use of name resolution for machines that are NOT
# on the local network segment
# - OR - are not deliberately to be known via lmhosts or via WINS.
; name resolve order = wins lmhosts bcast

# Windows Internet Name Serving Support Section:
# WINS Support - Tells the NMBD component of Samba to enable it's WINS Server
;   wins support = yes

# WINS Server - Tells the NMBD components of Samba to be a WINS Client
#	Note: Samba can be either a WINS Server, or a WINS Client, but NOT both
;   wins server = w.x.y.z

# WINS Proxy - Tells Samba to answer name resolution queries on
# behalf of a non WINS capable client, for this to work there must be
# at least one	WINS Server on the network. The default is NO.
;   wins proxy = yes

# DNS Proxy - tells Samba whether or not to try to resolve NetBIOS names
# via DNS nslookups. The built-in default for versions 1.9.17 is yes,
# this has been changed in version 1.9.18 to no.
   dns proxy = no 

# Case Preservation can be handy - system default is _no_
# NOTE: These can be set on a per share basis
;  preserve case = no
;  short preserve case = no
# Default case is normally upper case for all DOS files
;  default case = lower
# Be very careful with case sensitivity - it can break things!
;  case sensitive = no

#============================ Share Definitions ==============================
[homes]
   comment = Home Directories
   browseable = no
   writable = yes

# Un-comment the following and create the netlogon directory for Domain Logons
; [netlogon]
;   comment = Network Logon Service
;   path = /home/netlogon
;   guest ok = yes
;   writable = no
;   share modes = no


# Un-comment the following to provide a specific roving profile share
# the default is to use the user's home directory
;[Profiles]
;    path = /home/profiles
;    browseable = no
;    guest ok = yes


# NOTE: If you have a BSD-style print system there is no need to 
# specifically define each individual printer
[printers]
   comment = All Printers
   path = /var/spool/samba
   browseable = no
# Set public = yes to allow user 'guest account' to print
   guest ok = no
   writable = no
   printable = yes

# This one is useful for people to share files
;[tmp]
;   comment = Temporary file space
;   path = /tmp
;   read only = no
;   public = yes

# A publicly accessible directory, but read only, except for people in
# the "staff" group
;[public]
;   comment = Public Stuff
;   path = /home/samba
;   public = yes
;   read only = yes
;   write list = @staff

# Other examples. 
#
# A private printer, usable only by fred. Spool data will be placed in fred's
# home directory. Note that fred must have write access to the spool directory,
# wherever it is.
;[fredsprn]
;   comment = Fred's Printer
;   valid users = fred
;   path = /homes/fred
;   printer = freds_printer
;   public = no
;   writable = no
;   printable = yes

# A private directory, usable only by fred. Note that fred requires write
# access to the directory.
;[fredsdir]
;   comment = Fred's Service
;   path = /usr/somewhere/private
;   valid users = fred
;   public = no
;   writable = yes
;   printable = no

# a service which has a different directory for each machine that connects
# this allows you to tailor configurations to incoming machines. You could
# also use the %u option to tailor it by user name.
# The %m gets replaced with the machine name that is connecting.
;[pchome]
;  comment = PC Directories
;  path = /usr/pc/%m
;  public = no
;  writable = yes

# A publicly accessible directory, read/write to all users. Note that all files
# created in the directory by users will be owned by the default user, so
# any user with access can delete any other user's files. Obviously this
# directory must be writable by the default user. Another user could of course
# be specified, in which case all files would be owned by that user instead.
;[public]
;   path = /usr/somewhere/else/public
;   public = yes
;   only guest = yes
;   writable = yes
;   printable = no

# The following two entries demonstrate how to share a directory so that two
# users can place files there that will be owned by the specific users. In this
# setup, the directory should be writable by both users and should have the
# sticky bit set on it to prevent abuse. Obviously this could be extended to
# as many users as required.
;[myshare]
;   comment = Mary's and Fred's stuff
;   path = /usr/somewhere/shared
;   valid users = mary fred
;   public = no
;   writable = yes
;   printable = no
;   create mask = 0765

Any help would be much appreciated smile

Last edited by quasifilmie (2017-02-25 19:58:48)

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#2 2017-02-02 19:09:57

quasifilmie
Member
Registered: 2011-10-27
Posts: 296

Re: [SOLVED]Can change AD user passwords but can't login via su [winbind]

Update: I am able to successfully update AD users' passwords with the passwd command but can only login with an AD user using "sudo su <user here>" or "sudo -iu <user here>" which of course bypasses password authentication. I know I can change the password because when I go onto my server 2012 and use the new password to login it works.

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#3 2017-02-25 19:57:28

quasifilmie
Member
Registered: 2011-10-27
Posts: 296

Re: [SOLVED]Can change AD user passwords but can't login via su [winbind]

It's been a while but I found a solution.

In /etc/pam.d/su, I uncommented the line "auth sufficient pam_wheel.so trust use_uid" and it works. The gui and direct tty login for ad users didn't work before I uncommented this line and I'm not sure why it would make a difference in this case. To me, this should make only su work properly. If any pam guy can fill me I'd highly appreciate it.

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#4 2017-11-27 22:25:41

AveryFreeman
Member
Registered: 2017-11-25
Posts: 27

Re: [SOLVED]Can change AD user passwords but can't login via su [winbind]

quasifilmie wrote:

It's been a while but I found a solution.

In /etc/pam.d/su, I uncommented the line "auth sufficient pam_wheel.so trust use_uid" and it works. The gui and direct tty login for ad users didn't work before I uncommented this line and I'm not sure why it would make a difference in this case. To me, this should make only su work properly. If any pam guy can fill me I'd highly appreciate it.

I'm not a pam person, but I am noticing that in my version of configuration docs (samba 4.7.3-1), I have these commented lines in /etc/pam.d/su:

# Uncomment the following line to implicitly trust users in the "wheel" group.
#auth		sufficient	pam_wheel.so trust use_uid
# Uncomment the following line to require a user to be in the "wheel" group.
#auth		required	pam_wheel.so use_uid

Last edited by AveryFreeman (2017-11-27 22:26:17)

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