samba - Aug 2004 - Win2K Clients Getting Password Prompt When Trying To Access Samba Shares

I'm running Samba 3.0.4 with Kerberos 5 v 1.3.4.  I'm accessing Win2k 
shares from the Samba box without a hitch, but whenever I try to open up 
Samba shares on the Win2K clients, I get a password prompt.  If I access 
the shares via the IP address of the Samba machine, there's no problem.

I don't know if this is relevant, but my Win2k PDC is showing the 
following error on a regular basis

Pre-authentication failed:
  	User Name:		mp1$
  	User ID:		ALBERNI.NET\mp1$
  	Service Name:		krbtgt/ALBERNI.NET
  	Pre-Authentication Type:	0x0
  	Failure Code:		0x19
  	Client Address:		64.141.6.251


Below is my configs:

smb.conf:
[global]

# workgroup = NT-Domain-Name or Workgroup-Name, eg: REDHAT4
    workgroup = ALBERNI.NET

username map = /etc/samba/smbusers
idmap uid = 10000-20000
idmap gid = 10000-20000
template shell = /bin/bash
winbind separator = +
winbind use default domain = Yes
winbind enum users = yes
winbind enum groups = yes
encrypt passwords = yes

# server string is the equivalent of the NT Description field
    server string = MP1 Samba Server

# Security mode. Defines in which mode Samba will operate. Possible
# values are share, user, server, domain and ads. Most people will want
# user level security. See the HOWTO Collection for details.
    security = ADS

# 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.
hosts allow = 64.141.6. 127.

# If you want to automatically load your printer list rather
# than setting them up individually then you'll need this
    load printers = yes

# you may wish to override the location of the printcap file
;   printcap name = /etc/printcap

# on SystemV system setting printcap name to lpstat should allow
# you to automatically obtain a printer list from the SystemV spool
# system
;   printcap name = lpstat

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

# 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/log.%m

# Put a capping on the size of the log files (in Kb).
    max log size = 50

# Use password server option only with security = server
# The argument list may include:
#   password server = My_PDC_Name [My_BDC_Name] [My_Next_BDC_Name]
# or to auto-locate the domain controller/s
#   password server = *
;   password server = <NT-Server-Name>
password server = *

# Use the realm option only with security = ads
# Specifies the Active Directory realm the host is part of
;   realm = MY_REALM
realm = ALBERNI.NET
ads server = cedar.alberni.net

# Backend to store user information in. New installations should
# use either tdbsam or ldapsam. smbpasswd is available for backwards
# compatibility. tdbsam requires no further configuration.
;   passdb backend = tdbsam

# 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.
# Note: Consider carefully the location in the configuration file of
#       this line.  The included file is read at that point.
;   include = /usr/local/samba/lib/smb.conf.%m

# Most people will find that this option gives better performance.
# See the chapter 'Samba performance issues' in the Samba HOWTO
Collection
# and the manual pages for details.
# You may want to add the following on a Linux system:
#         SO_RCVBUF=8192 SO_SNDBUF=8192
    socket options = TCP_NODELAY

# 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

# 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
os level = 10

# 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

# 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

# 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 default is NO.
    dns proxy = no

# These scripts are used on a domain controller or stand-alone
# machine to add or delete corresponding unix accounts
;  add user script = /usr/sbin/useradd %u
;  add group script = /usr/sbin/groupadd %g
;  add machine script = /usr/sbin/adduser -n -g machines -c Machine -d 
/dev/null -s /bin/false %u
;  delete user script = /usr/sbin/userdel %u
;  delete user from group script = /usr/sbin/deluser %u %g
;  delete group script = /usr/sbin/groupdel %g


#============================ 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 = /usr/local/samba/lib/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 = /usr/local/samba/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 = /usr/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
    writable = yes
    printable = no
    write list = alberni.net

# 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.

[logs]
path = /var/log
public = no
admin users = root admin administrator
valid users = root admin administrator
read only = no
browseable = yes
writeable = yes

krb5.conf:
[logging]
default = FILE:/var/log/krb5/libs.log
kdc = FILE:/var/log/krb5/kdc.log
admin_server = FILE:/var/log/krb5/admin.log

[libdefaults]
ticket_lifetime = 24000
default_realm = ALBERNI.NET
forwardable = true
proxiable = true
default_tgs_enctypes = des-cbc-crc des-cbc-md5
default_tkt_enctypes = des-cbc-crc des-cbc-md5

[realms]
ALBERNI.NET = {
kdc = cedar.alberni.net
default_domain = alberni.net
}

[domain_realm]
.alberni.net = CEDAR.ALBERNI.NET
alberni.net = CEDAR.ALBERNI.NET

nsswitch.conf:
passwd:         compat winbind
group:          compat winbind

hosts:          files dns winbind
networks:       files

services:       files
protocols:      files
rpc:            files
ethers:         files
netmasks:       files
netgroup:       files
bootparams:     files

automount:      files
aliases:        files


-- 
A. Clausen
techlists@alberni.net

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A. Clausen wrote:
| I'm running Samba 3.0.4 with Kerberos 5 v 1.3.4.  I'm accessing Win2k
| shares from the Samba box without a hitch, but whenever I try to open up
| Samba shares on the Win2K clients, I get a password prompt.  If I access
| the shares via the IP address of the Samba machine, there's no problem.
|
| I don't know if this is relevant, but my Win2k PDC is showing the
| following error on a regular basis
|
| Pre-authentication failed:
|      User Name:        mp1$
|      User ID:        ALBERNI.NET\mp1$
|      Service Name:        krbtgt/ALBERNI.NET
|      Pre-Authentication Type:    0x0
|      Failure Code:        0x19
|      Client Address:        64.141.6.251

Windows 200x requires krb5 preauthentication by the client
before it will issue a TGT.  Looks like your kerberos setup
is not working correctly (also the cause of the password
prompt issue mentioned above).




cheers, jerry
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