[Samba] Printing with smbspool_krb5_wrapper not working in Ubuntu 16.04

Rowland Penny rpenny at samba.org
Sat Aug 5 13:55:56 UTC 2017


On Sat, 5 Aug 2017 15:29:54 +0200
Van Svensson via samba <samba at lists.samba.org> wrote:

> Rowland Penny wrote:
> 
> > On Sat, 5 Aug 2017 14:44:34 +0200
> > Van Svensson via samba <samba at lists.samba.org> wrote:
> > 
> > > Rowland Penny wrote:
> > > 
> > > > On Sat, 5 Aug 2017 13:06:18 +0200
> > > > Van Svensson via samba <samba at lists.samba.org> wrote:
> > > > 
> > > > > Thanks for your reply! I have now filed a bug in launchpad
> > > > > (https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1708817).
> > > > > 
> > > > > When I compare the cups error_log with 14.04 where it does
> > > > > work I see that 16.04 uses two backslashes when setting
> > > > > KRB5CCNAME while 14.04 does not use backslashes, maybe that
> > > > > is the problem?
> > > > > 
> > > > > Sometimes the cups error_log also have the below line
> > > > > "HTTP_STATE_WAITING Closing for error 32 (Broken pipe)" like I
> > > > > show below. Both this line and the line "Could not determine
> > > > > network interfaces, you must use a interfaces config line"
> > > > > maybe can give some idea on what goes wrong? The line
> > > > > "Printing jobs and dirty files" can maybe be ignored since it
> > > > > also shows up in 14.04 where it works.
> > > > 
> > > > It might help if you could tell us what versions of Samba you
> > > > are using (it might shock you, but some people don't use Ubuntu
> > > > ), it would also be a good idea to post your smb.conf files.
> > > 
> > > I attach the smb.conf file which is exactly the same for both
> > > Ubuntu 14.04 and 16.04. On 14.04 I have Samba version
> > > 2:4.3.11+dfsg-0ubuntu0.14.04.10 and on 16.04 I have
> > > 2:4.3.11+dfsg-0ubuntu0.16.04.9.
> >
> > Sorry, but this mailing list strips off attachments, you will need
> > to copy it into the post.
> 
> Here it comes (according to "diff" the smb.conf file is exactly the
> same for both Ubuntu 14.04 and 16.04):
> 
> #
> # Sample configuration file for the Samba suite for Debian GNU/Linux.
> #
> #
> # This is the main Samba configuration file. You should read the
> # smb.conf(5) manual page in order to understand the options listed
> # here. Samba has a huge number of configurable options most of which 
> # are not shown in this example
> #
> # Some options that are often worth tuning have been included as
> # commented-out examples in this file.
> #  - When such options are commented with ";", the proposed setting
> #    differs from the default Samba behaviour
> #  - When commented with "#", the proposed setting is the default
> #    behaviour of Samba but the option is considered important
> #    enough to be mentioned here
> #
> # NOTE: Whenever you modify this file you should run the command
> # "testparm" to check that you have not made any basic syntactic 
> # errors. 
> 
> #======================= Global Settings =======================
> 
> [global]
> 
> ## Browsing/Identification ###
> 
> # Change this to the workgroup/NT-domain name your Samba server will
> part of workgroup = WORKGROUP
> 
> # server string is the equivalent of the NT Description field
>         server string = %h server (Samba, Ubuntu)
> 
> # Windows Internet Name Serving Support Section:
> # WINS Support - Tells the NMBD component of Samba to enable its WINS
> Server #   wins support = no
> 
> # 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
> 
> # This will prevent nmbd to search for NetBIOS names through DNS.
>    dns proxy = no
> 
> #### Networking ####
> 
> # The specific set of interfaces / networks to bind to
> # This can be either the interface name or an IP address/netmask;
> # interface names are normally preferred
> ;   interfaces = 127.0.0.0/8 eth0
> 
> # Only bind to the named interfaces and/or networks; you must use the
> # 'interfaces' option above to use this.
> # It is recommended that you enable this feature if your Samba
> machine is # not protected by a firewall or is a firewall itself.
> However, this # option cannot handle dynamic or non-broadcast
> interfaces correctly. ;   bind interfaces only = yes
> 
> 
> 
> #### Debugging/Accounting ####
> 
> # This tells Samba to use a separate log file for each machine
> # that connects
>    log file = /var/log/samba/log.%m
> 
> # Cap the size of the individual log files (in KiB).
>    max log size = 1000
> 
> # If you want Samba to only log through syslog then set the following
> # parameter to 'yes'.
> #   syslog only = no
> 
> # We want Samba to log a minimum amount of information to syslog.
> Everything # should go to /var/log/samba/log.{smbd,nmbd} instead. If
> you want to log # through syslog you should set the following
> parameter to something higher. syslog = 0
> 
> # Do something sensible when Samba crashes: mail the admin a backtrace
>    panic action = /usr/share/samba/panic-action %d
> 
> 
> ####### Authentication #######
> 
> # Server role. Defines in which mode Samba will operate. Possible
> # values are "standalone server", "member server", "classic primary
> # domain controller", "classic backup domain controller", "active
> # directory domain controller". 
> #
> # Most people will want "standalone sever" or "member server".
> # Running as "active directory domain controller" will require first
> # running "samba-tool domain provision" to wipe databases and create a
> # new domain.
>    server role = standalone server
> 
> # If you are using encrypted passwords, Samba will need to know what
> # password database type you are using.  
>    passdb backend = tdbsam
> 
>    obey pam restrictions = yes
> 
> # This boolean parameter controls whether Samba attempts to sync the
> Unix # password with the SMB password when the encrypted SMB password
> in the # passdb is changed.
>    unix password sync = yes
> 
> # For Unix password sync to work on a Debian GNU/Linux system, the
> following # parameters must be set (thanks to Ian Kahan
> <<kahan at informatik.tu-muenchen.de> for # sending the correct chat
> script for the passwd program in Debian Sarge). passwd program
> = /usr/bin/passwd %u passwd chat = *Enter\snew\s*\spassword:* %n\n
> *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
> 
> # This boolean controls whether PAM will be used for password changes
> # when requested by an SMB client instead of the program listed in
> # 'passwd program'. The default is 'no'.
>    pam password change = yes
> 
> # This option controls how unsuccessful authentication attempts are
> mapped # to anonymous connections
>    map to guest = bad user
> 
> ########## Domains ###########
> 
> #
> # The following settings only takes effect if 'server role = primary
> # classic domain controller', 'server role = backup domain controller'
> # or 'domain logons' is set 
> #
> 
> # It specifies the location of the user's
> # profile directory from the client point of view) The following
> # required a [profiles] share to be setup on the samba server (see
> # below)
> ;   logon path = \\%N\profiles\%U
> # Another common choice is storing the profile in the user's home
> directory # (this is Samba's default)
> #   logon path = \\%N\%U\profile
> 
> # The following setting only takes effect if 'domain logons' is set
> # It specifies the location of a user's home directory (from the
> client # point of view)
> ;   logon drive = H:
> #   logon home = \\%N\%U
> 
> # The following setting only takes effect if 'domain logons' is set
> # It specifies the script to run during logon. The script must be
> stored # in the [netlogon] share
> # NOTE: Must be store in 'DOS' file format convention
> ;   logon script = logon.cmd
> 
> # This allows Unix users to be created on the domain controller via
> the SAMR # RPC pipe.  The example command creates a user account with
> a disabled Unix # password; please adapt to your needs
> ; add user script = /usr/sbin/adduser --quiet --disabled-password
> --gecos "" %u
> 
> # This allows machine accounts to be created on the domain controller
> via the # SAMR RPC pipe.  
> # The following assumes a "machines" group exists on the system
> ; add machine script  = /usr/sbin/useradd -g machines -c "%u machine
> account" -d /var/lib/samba -s /bin/false %u
> 
> # This allows Unix groups to be created on the domain controller via
> the SAMR # RPC pipe.  
> ; add group script = /usr/sbin/addgroup --force-badname %g
> 
> ############ Misc ############
> 
> # 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 = /home/samba/etc/smb.conf.%m
> 
> # Some defaults for winbind (make sure you're not using the ranges
> # for something else.)
> ;   idmap uid = 10000-20000
> ;   idmap gid = 10000-20000
> ;   template shell = /bin/bash
> 
> # Setup usershare options to enable non-root users to share folders
> # with the net usershare command.
> 
> # Maximum number of usershare. 0 (default) means that usershare is
> disabled. ;   usershare max shares = 100
> 
> # Allow users who've been granted usershare privileges to create
> # public shares, not just authenticated ones
>    usershare allow guests = yes
> 
> #======================= Share Definitions =======================
> 
> # Un-comment the following (and tweak the other settings below to
> suit) # to enable the default home directory shares. This will share
> each # user's home directory as \\server\username
> ;[homes]
> ;   comment = Home Directories
> ;   browseable = no
> 
> # By default, the home directories are exported read-only. Change the
> # next parameter to 'no' if you want to be able to write to them.
> ;   read only = yes
> 
> # File creation mask is set to 0700 for security reasons. If you want
> to # create files with group=rw permissions, set next parameter to
> 0775. ;   create mask = 0700
> 
> # Directory creation mask is set to 0700 for security reasons. If you
> want to # create dirs. with group=rw permissions, set next parameter
> to 0775. ;   directory mask = 0700
> 
> # By default, \\server\username shares can be connected to by anyone
> # with access to the samba server.
> # Un-comment the following parameter to make sure that only "username"
> # can connect to \\server\username
> # This might need tweaking when using external authentication schemes
> ;   valid users = %S
> 
> # Un-comment the following and create the netlogon directory for
> Domain Logons # (you need to configure Samba to act as a domain
> controller too.) ;[netlogon]
> ;   comment = Network Logon Service
> ;   path = /home/samba/netlogon
> ;   guest ok = yes
> ;   read only = yes
> 
> # Un-comment the following and create the profiles directory to store
> # users profiles (see the "logon path" option above)
> # (you need to configure Samba to act as a domain controller too.)
> # The path below should be writable by all users so that their
> # profile directory may be created the first time they log on
> ;[profiles]
> ;   comment = Users profiles
> ;   path = /home/samba/profiles
> ;   guest ok = no
> ;   browseable = no
> ;   create mask = 0600
> ;   directory mask = 0700
> 
> [printers]
>    comment = All Printers
>    browseable = no
>    path = /var/spool/samba
>    printable = yes
>    guest ok = no
>    read only = yes
>    create mask = 0700
> 
> # Windows clients look for this share name as a source of downloadable
> # printer drivers
> [print$]
>    comment = Printer Drivers
>    path = /var/lib/samba/printers
>    browseable = yes
>    read only = yes
>    guest ok = no
> # Uncomment to allow remote administration of Windows print drivers.
> # You may need to replace 'lpadmin' with the name of the group your
> # admin users are members of.
> # Please note that you also need to set appropriate Unix permissions
> # to the drivers directory for these users to have write rights in it
> ;   write list = root, @lpadmin
> 

OK, after I removed all the commented lines and default lines, I was
left with this:

[global]
   server string = %h server (Samba, Ubuntu)
   dns proxy = no

   log file = /var/log/samba/log.%m
   max log size = 1000
   syslog = 0
   panic action = /usr/share/samba/panic-action %d

   server role = standalone server
   obey pam restrictions = yes
   unix password sync = yes

   passwd program = /usr/bin/passwd %u
   passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .

   pam password change = yes
   map to guest = bad user
   usershare allow guests = yes

[printers]
   comment = All Printers
   browseable = no
   path = /var/spool/samba
   printable = yes
   create mask = 0700

[print$]
   comment = Printer Drivers
   path = /var/lib/samba/printers

About the only thing wrong with this is that you haven't set:
 'security = user'

I also take it that your users exist on the machine in /etc/passwd and
in Samba

You might also want to point out to Ubuntu that the 4.3.x versions are
EOL and that 4.7.0 will be released very soon, at which point the only
supported versions (by Samba) will be 4.5.x, 4.6.x and 4.7.x 

Rowland



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