[Pkg-samba-maint] Bug#974868: samba: can't serve size-limited Time Machine shares on i386
Reid Priedhorsky
reid at reidster.net
Sun Nov 15 19:58:21 GMT 2020
Package: samba
Version: 2:4.9.5+dfsg-5+deb10u1
Severity: important
Tags: patch
Hi,
With the following line on a share in smb.conf:
fruit:time machine max size = 640G
authentication fails on my Mac when attempting to mount the share. This
appears in the log:
fruit_tmsize_do_dirent: tmsize overflow
I'm pretty sure the problem is an instance of this upstream bug:
https://bugzilla.samba.org/show_bug.cgi?id=13622
which was fixed with this patch:
https://bugzilla.samba.org/attachment.cgi?id=15850
The share mounts and Time Machine is happy with it if I remove the
configuration line noted.
I believe the bug is fixed in the testing and unstable versions of the
package, but I haven't verified this. The testing package has unmet
dependencies on stable and there seems to be no backport. I am running
multi-arch but the amd64 package had dependency problems I couldn't figure
out. So the request is to apply the (quite short) patch to the stable version.
I tagged it important because serving Time Machine shares is a common use of
Samba and without this option, I can't put the share on a common filesystem
without the backups growing unbounded. In my case, I have one Time Machine
backup that's excessively large already and I want to keep it from getting
worse.
Please let me know what additional information I can provide to help.
Thanks for your hard work on Debian! This particular box was originally
installed around 1998 and upgraded smoothly since then, which speaks very well
for the project IMO.
Reid
-- Package-specific info:
* /etc/samba/smb.conf present, and attached
* /var/lib/samba/dhcp.conf present, and attached
-- System Information:
Debian Release: 10.6
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: i386 (x86_64)
Foreign Architectures: amd64
Kernel: Linux 4.19.0-12-amd64 (SMP w/12 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages samba depends on:
ii adduser 3.118
ii dpkg 1.19.7
ii libbsd0 0.9.1-2
ii libc6 2.28-10
ii libldb1 2:1.5.1+really1.4.6-3
ii libpam-modules 1.3.1-5
ii libpam-runtime 1.3.1-5
ii libpopt0 1.16-12
ii libpython2.7 2.7.16-2+deb10u1
ii libtalloc2 2.1.14-2
ii libtdb1 1.3.16-2+b1
ii libtevent0 0.9.37-1
ii lsb-base 10.2019051400
ii procps 2:3.3.15-2
ii python 2.7.16-1
ii python-dnspython 1.16.0-1
ii python-samba 2:4.9.5+dfsg-5+deb10u1
ii python2.7 2.7.16-2+deb10u1
ii samba-common 2:4.9.5+dfsg-5+deb10u1
ii samba-common-bin 2:4.9.5+dfsg-5+deb10u1
ii samba-libs 2:4.9.5+dfsg-5+deb10u1
ii tdb-tools 1.3.16-2+b1
Versions of packages samba recommends:
ii attr 1:2.4.48-4
ii logrotate 3.14.0-4
ii samba-dsdb-modules 2:4.9.5+dfsg-5+deb10u1
ii samba-vfs-modules 2:4.9.5+dfsg-5+deb10u1
Versions of packages samba suggests:
pn bind9 <none>
pn bind9utils <none>
pn ctdb <none>
pn ldb-tools <none>
pn ntp | chrony <none>
pn smbldap-tools <none>
pn ufw <none>
pn winbind <none>
-- no debconf information
-------------- next part --------------
#
# 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]
# Time Machine stuff
min protocol = SMB2
fruit:time machine = yes
fruit:aapl = yes
fruit:delete_empty_adfiles = yes
## Browsing/Identification ###
# Change this to the workgroup/NT-domain name your Samba server will part of
workgroup = JESSNET
#### 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
# We want Samba to only log to /var/log/samba/log.{smbd,nmbd}.
# Append syslog at 1 if you want important messages to be sent to syslog too.
logging = file
# 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 server" 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
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 config * : backend = tdb
; idmap config * : range = 3000-7999
; idmap config YOURDOMAINHERE : backend = tdb
; idmap config YOURDOMAINHERE : range = 100000-999999
; 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 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 =======================
;[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.
# The following parameter makes 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
[reid-tm-share]
path = /storage/scratch/timemachine-reid
browseable = yes
writeable = yes
valid users = reid-tm
vfs objects = catia fruit streams_xattr
# can't enable this b/c bug on 32-bit architectures:
# https://bugzilla.samba.org/show_bug.cgi?id=13622
; fruit:time machine max size = 640G
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