[Samba] Force Create Mode Problems

[Eric Krause]

Hi there. I am using Samba 4.2.10 on Scientific Linux 7.1.

I am currently trying to make an SMB share that is accessible to all of our Active Directory domain users. Additionally, this share needs to allow read/write access for our clients, who are using FTP. All of the subdirectories for this share represent an individual FTP user's folder.

The share is named "ftpshares". The problem that I am currently having with this share is that I cannot seem to get the "force create mode" setting to perform as expected. I would like it to force 0766 to the share, its subdirectories, and the files created within. However, when I look at a file that was created from a windows machine, these are the permissions that I see:

-rwxrwx-w-+ 1 root domain users 0 Jun 21 12:26 test.txt

This is a problem, as FTP users can only write to the file. This seems like a really strange behavior. I have posted my smb.conf for your review. Any help you can give me would be greatly appreciated.

# This is the main Samba configuration file. For detailed information about the
# options listed here, refer to the smb.conf(5) manual page. Samba has a huge
# number of configurable options, most of which are not shown in this example.
#
# The Official Samba 3.2.x HOWTO and Reference Guide contains step-by-step
# guides for installing, configuring, and using Samba:
# http://www.samba.org/samba/docs/Samba-HOWTO-Collection.pdf
#
# The Samba-3 by Example guide has working examples for smb.conf. This guide is
# generated daily: http://www.samba.org/samba/docs/Samba-Guide.pdf
#
# In this file, lines starting with a semicolon (;) or a hash (#) are
# comments and are ignored. This file uses hashes to denote commentary and
# semicolons for parts of the file you may wish to configure.
#
# Note: Run the "testparm" command after modifying this file to check for basic
# syntax errors.
#
#---------------
# Security-Enhanced Linux (SELinux) Notes:
#
# Turn the samba_domain_controller Boolean on to allow Samba to use the useradd
# and groupadd family of binaries. Run the following command as the root user to
# turn this Boolean on:
# setsebool -P samba_domain_controller on
#
# Turn the samba_enable_home_dirs Boolean on if you want to share home
# directories via Samba. Run the following command as the root user to turn this
# Boolean on:
# setsebool -P samba_enable_home_dirs on
#
# If you create a new directory, such as a new top-level directory, label it
# with samba_share_t so that SELinux allows Samba to read and write to it. Do
# not label system directories, such as /etc/ and /home/, with samba_share_t, as
# such directories should already have an SELinux label.
#
# Run the "ls -ldZ /path/to/directory" command to view the current SELinux
# label for a given directory.
#
# Set SELinux labels only on files and directories you have created. Use the
# chcon command to temporarily change a label:
# chcon -t samba_share_t /path/to/directory
#
# Changes made via chcon are lost when the file system is relabeled or commands
# such as restorecon are run.
#
# Use the samba_export_all_ro or samba_export_all_rw Boolean to share system
# directories. To share such directories and only allow read-only permissions:
# setsebool -P samba_export_all_ro on
# To share such directories and allow read and write permissions:
# setsebool -P samba_export_all_rw on
#
# To run scripts (preexec/root prexec/print command/...), copy them to the
# /var/lib/samba/scripts/ directory so that SELinux will allow smbd to run them.
# Note that if you move the scripts to /var/lib/samba/scripts/, they retain
# their existing SELinux labels, which may be labels that SELinux does not allow
# smbd to run. Copying the scripts will result in the correct SELinux labels.
# Run the "restorecon -R -v /var/lib/samba/scripts" command as the root user to
# apply the correct SELinux labels to these files.
#
#--------------
#
#======================= Global Settings =====================================

[global]
netbios name = FS04
workgroup = RSC
server string = Samba Server Version %v
security = ads
realm = AD.RINGSIDECREATIVE.COM
socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=131072 SO_SNDBUF=131072
use sendfile = true
idmap config * : backend = tdb
idmap config * : range = 100000-199999
idmap config RSC : backend = rid
idmap config RSC : range = 100000-199999
winbind separator = +
winbind enum users = yes
winbind enum groups = yes
winbind use default domain = yes
winbind refresh tickets = yes
restrict anonymous = 2
log file = /var/log/samba/log.%m
max log size = 50

# ----------------------- Network-Related Options -------------------------
#
# workgroup = the Windows NT domain name or workgroup name, for example, MYGROUP.
#
# server string = the equivalent of the Windows NT Description field.
#
# netbios name = used to specify a server name that is not tied to the hostname.
#
# interfaces = used to configure Samba to listen on multiple network interfaces.
# If you have multiple interfaces, you can use the "interfaces =" option to
# configure which of those interfaces Samba listens on. Never omit the localhost
# interface (lo).
#
# hosts allow = the hosts allowed to connect. This option can also be used on a
# per-share basis.
#
# hosts deny = the hosts not allowed to connect. This option can also be used on
# a per-share basis.
#
# max protocol = used to define the supported protocol. The default is NT1. You
# can set it to SMB2 if you want experimental SMB2 support.
#
; workgroup = RSC
; netbios name = FS04

; interfaces = lo eth0 192.168.12.2/24 192.168.13.2/24
; hosts allow = 127. 192.168.12. 192.168.13.

; max protocol = SMB2

# --------------------------- Logging Options -----------------------------
#
# log file = specify where log files are written to and how they are split.
#
# max log size = specify the maximum size log files are allowed to reach. Log
# files are rotated when they reach the size specified with "max log size".
#

# log files split per-machine:
# maximum size of 50KB per log file, then rotate:

# ----------------------- Standalone Server Options ------------------------
#
# security = the mode Samba runs in. This can be set to user, share
# (deprecated), or server (deprecated).
#
# passdb backend = the backend used to store user information in. New
# installations should use either tdbsam or ldapsam. No additional configuration
# is required for tdbsam. The "smbpasswd" utility is available for backwards
# compatibility.
#



# ----------------------- Domain Members Options ------------------------
#
# security = must be set to domain or ads.
#
# passdb backend = the backend used to store user information in. New
# installations should use either tdbsam or ldapsam. No additional configuration
# is required for tdbsam. The "smbpasswd" utility is available for backwards
# compatibility.
#
# realm = only use the realm option when the "security = ads" option is set.
# The realm option specifies the Active Directory realm the host is a part of.
#
# password server = only use this option when the "security = server"
# option is set, or if you cannot use DNS to locate a Domain Controller. The
# argument list can include My_PDC_Name, [My_BDC_Name], and [My_Next_BDC_Name]:
#
# password server = My_PDC_Name [My_BDC_Name] [My_Next_BDC_Name]
#
# Use "password server = *" to automatically locate Domain Controllers.

; security = domain
; passdb backend = tdbsam
; realm = MY_REALM

; password server = <NT-Server-Name>

# ----------------------- Domain Controller Options ------------------------
#
# security = must be set to user for domain controllers.
#
# passdb backend = the backend used to store user information in. New
# installations should use either tdbsam or ldapsam. No additional configuration
# is required for tdbsam. The "smbpasswd" utility is available for backwards
# compatibility.
#
# domain master = specifies Samba to be the Domain Master Browser, allowing
# Samba to collate browse lists between subnets. Do not use the "domain master"
# option if you already have a Windows NT domain controller performing this task.
#
# domain logons = allows Samba to provide a network logon service for Windows
# workstations.
#
# logon script = specifies a script to run at login time on the client. These
# scripts must be provided in a share named NETLOGON.
#
# logon path = specifies (with a UNC path) where user profiles are stored.
#
#
; security = user
; passdb backend = tdbsam

; domain master = yes
; domain logons = yes

# the following login script name is determined by the machine name
# (%m):
; logon script = %m.bat
# the following login script name is determined by the UNIX user used:
; logon script = %u.bat
; logon path = \\%L\Profiles\%u
# use an empty path to disable profile support:
; logon path =

# various scripts can be used on a domain controller or a stand-alone
# machine to add or delete corresponding UNIX accounts:

; add user script = /usr/sbin/useradd "%u" -n -g users
; add group script = /usr/sbin/groupadd "%g"
; add machine script = /usr/sbin/useradd -n -c "Workstation (%u)" -M -d /nohome -s /bin/false "%u"
; delete user script = /usr/sbin/userdel "%u"
; delete user from group script = /usr/sbin/userdel "%u" "%g"
; delete group script = /usr/sbin/groupdel "%g"


# ----------------------- Browser Control Options ----------------------------
#
# local master = when set to no, Samba does not become the master browser on
# your network. When set to yes, normal election rules apply.
#
# os level = determines the precedence the server has in master browser
# elections. The default value should be reasonable.
#
# preferred master = when set to yes, Samba forces a local browser election at
# start up (and gives itself a slightly higher chance of winning the election).
#
; local master = no
; os level = 33
; preferred master = yes

#----------------------------- Name Resolution -------------------------------
#
# This section details the support for the Windows Internet Name Service (WINS).
#
# Note: Samba can be either a WINS server or a WINS client, but not both.
#
# wins support = when set to yes, the NMBD component of Samba enables its WINS
# server.
#
# wins server = tells the NMBD component of Samba to be a WINS client.
#
# wins proxy = when set to yes, Samba answers 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.
#
# dns proxy = when set to yes, Samba attempts to resolve NetBIOS names via DNS
# nslookups.

; wins support = yes
; wins server = w.x.y.z
; wins proxy = yes

; dns proxy = yes

# --------------------------- Printing Options -----------------------------
#
# The options in this section allow you to configure a non-default printing
# system.
#
# load printers = when set you yes, the list of printers is automatically
# loaded, rather than setting them up individually.
#
# cups options = allows you to pass options to the CUPS library. Setting this
# option to raw, for example, allows you to use drivers on your Windows clients.
#
# printcap name = used to specify an alternative printcap file.
#


; printcap name = /etc/printcap
# obtain a list of printers automatically on UNIX System V systems:
; printcap name = lpstat
; printing = cups

# --------------------------- File System Options ---------------------------
#
# The options in this section can be un-commented if the file system supports
# extended attributes, and those attributes are enabled (usually via the
# "user_xattr" mount option). These options allow the administrator to specify
# that DOS attributes are stored in extended attributes and also make sure that
# Samba does not change the permission bits.
#
# Note: These options can be used on a per-share basis. Setting them globally
# (in the [global] section) makes them the default for all shares.

; map archive = no
; map hidden = no
; map read only = no
; map system = no
; store dos attributes = yes


#============================ Share Definitions ==============================

;[homes]
; comment = Home Directories
; browseable = no
; writable = yes
; valid users = %S
; valid users = MYDOMAIN\%S

[printers]
comment = All Printers
path = /var/spool/samba
browseable = no
guest ok = no
writable = no
printable = yes

# Un-comment the following and create the netlogon directory for Domain Logons:
; [netlogon]
; comment = Network Logon Service
; path = /var/lib/samba/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 = /var/lib/samba/profiles
; browseable = no
; guest ok = yes

# A publicly accessible directory that is read only, except for users in the
# "staff" group (which have write permissions):
; [public]
; comment = Public Stuff
; path = /home/samba
; public = yes
; writable = yes
; printable = no
; write list = +staff

[ftpshares]
writeable = yes
admin users = @"RSC+Domain Admins"
path = /mnt/fs/ftps
write list = "Domain Users",@"Domain Users"
valid users = "Domain Users",@"Domain Users"
force create mode = 0766
browsable = yes
force directory mode = 0766

eric krause | network engineer
ringside.cutters.flavor.picnic.moonlink

248 548 2500 w
248 217 3782 c

ringsidecreative.com

<http://ringsidecreative.com/>

[Eric Krause]

Rowland,

Thanks for your input. Per your suggestions, I have changed the global options in my configuration:

[global]
netbios name = FS04
workgroup = RSC
server string = Samba Server Version %v
security = ads
realm = AD.RINGSIDECREATIVE.COM
use sendfile = true
idmap config * : backend = tdb
idmap config * : range = 200000-299999
idmap config RSC : backend = rid
idmap config RSC : range = 100000-199999
winbind separator = +
winbind enum users = yes
winbind enum groups = yes
winbind use default domain = yes
winbind refresh tickets = yes
restrict anonymous = 2
log file = /var/log/samba/log.%m
max log size = 50

I then reloaded the samba service (systemctl restart smb) However, I still get the same problems when creating a file from a windows machine.

I appreciate the suggestion about using Windows ACLs. However, I think that doing so would also require a reengineering of the FTP side of this server. I'd like for the server to function without the use of Windows ACLs, if possible.

Are there any logs that I can provide that will assist with troubleshooting this issue? I have looked through the logs in /var/log/samba, but I haven't found very much useful information.

Let me know. Thanks.

-----Original Message-----
From: samba [mailto:samba-***@lists.samba.org] On Behalf Of Rowland penny
Sent: Tuesday, June 21, 2016 1:23 PM
To: ***@lists.samba.org
Subject: Re: [Samba] Force Create Mode Problems

Post by Eric Krause
Hi there. I am using Samba 4.2.10 on Scientific Linux 7.1.
I am currently trying to make an SMB share that is accessible to all of our Active Directory domain users. Additionally, this share needs to allow read/write access for our clients, who are using FTP. All of the subdirectories for this share represent an individual FTP user's folder.
-rwxrwx-w-+ 1 root domain users 0 Jun 21 12:26 test.txt
This is a problem, as FTP users can only write to the file. This seems like a really strange behavior. I have posted my smb.conf for your review. Any help you can give me would be greatly appreciated.
# This is the main Samba configuration file. For detailed information
about the # options listed here, refer to the smb.conf(5) manual page.
Samba has a huge # number of configurable options, most of which are not shown in this example.
#
# The Official Samba 3.2.x HOWTO and Reference Guide contains
# http://www.samba.org/samba/docs/Samba-HOWTO-Collection.pdf
#
# The Samba-3 by Example guide has working examples for smb.conf. This
http://www.samba.org/samba/docs/Samba-Guide.pdf
#
# In this file, lines starting with a semicolon (;) or a hash (#) are
# comments and are ignored. This file uses hashes to denote commentary
and # semicolons for parts of the file you may wish to configure.
#
# Note: Run the "testparm" command after modifying this file to check
for basic # syntax errors.
#
#---------------
#
# Turn the samba_domain_controller Boolean on to allow Samba to use
the useradd # and groupadd family of binaries. Run the following
# setsebool -P samba_domain_controller on # # Turn the
samba_enable_home_dirs Boolean on if you want to share home #
directories via Samba. Run the following command as the root user to
# setsebool -P samba_enable_home_dirs on # # If you create a new
directory, such as a new top-level directory, label it # with
samba_share_t so that SELinux allows Samba to read and write to it. Do
# not label system directories, such as /etc/ and /home/, with
samba_share_t, as # such directories should already have an SELinux label.
#
# Run the "ls -ldZ /path/to/directory" command to view the current
SELinux # label for a given directory.
#
# Set SELinux labels only on files and directories you have created.
# chcon -t samba_share_t /path/to/directory # # Changes made via chcon
are lost when the file system is relabeled or commands # such as
restorecon are run.
#
# Use the samba_export_all_ro or samba_export_all_rw Boolean to share
# setsebool -P samba_export_all_ro on
# setsebool -P samba_export_all_rw on
#
# To run scripts (preexec/root prexec/print command/...), copy them to
the # /var/lib/samba/scripts/ directory so that SELinux will allow smbd to run them.
# Note that if you move the scripts to /var/lib/samba/scripts/, they
retain # their existing SELinux labels, which may be labels that
SELinux does not allow # smbd to run. Copying the scripts will result in the correct SELinux labels.
# Run the "restorecon -R -v /var/lib/samba/scripts" command as the
root user to # apply the correct SELinux labels to these files.
#
#--------------
#
#======================= Global Settings
=====================================
[global]
netbios name = FS04
workgroup = RSC
server string = Samba Server Version %v
security = ads
realm = AD.RINGSIDECREATIVE.COM
socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=131072 SO_SNDBUF=131072
use sendfile = true
idmap config * : backend = tdb
idmap config * : range = 100000-199999
idmap config RSC : backend = rid
idmap config RSC : range = 100000-199999
winbind separator = +
winbind enum users = yes
winbind enum groups = yes
winbind use default domain = yes
winbind refresh tickets = yes
restrict anonymous = 2
log file = /var/log/samba/log.%m
max log size = 50
# ----------------------- Network-Related Options
------------------------- # # workgroup = the Windows NT domain name
or workgroup name, for example, MYGROUP.
#
# server string = the equivalent of the Windows NT Description field.
#
# netbios name = used to specify a server name that is not tied to the hostname.
#
# interfaces = used to configure Samba to listen on multiple network interfaces.
# If you have multiple interfaces, you can use the "interfaces ="
option to # configure which of those interfaces Samba listens on.
Never omit the localhost # interface (lo).
#
# hosts allow = the hosts allowed to connect. This option can also be
used on a # per-share basis.
#
# hosts deny = the hosts not allowed to connect. This option can also
be used on # a per-share basis.
#
# max protocol = used to define the supported protocol. The default is
NT1. You # can set it to SMB2 if you want experimental SMB2 support.
#
; workgroup = RSC
; netbios name = FS04
; interfaces = lo eth0 192.168.12.2/24 192.168.13.2/24
; hosts allow = 127. 192.168.12. 192.168.13.
; max protocol = SMB2
# --------------------------- Logging Options
----------------------------- # # log file = specify where log files
are written to and how they are split.
#
# max log size = specify the maximum size log files are allowed to
reach. Log # files are rotated when they reach the size specified with "max log size".
#
# ----------------------- Standalone Server Options
------------------------ # # security = the mode Samba runs in. This
can be set to user, share # (deprecated), or server (deprecated).
#
# passdb backend = the backend used to store user information in. New
# installations should use either tdbsam or ldapsam. No additional
configuration # is required for tdbsam. The "smbpasswd" utility is
available for backwards # compatibility.
#
# ----------------------- Domain Members Options
------------------------ # # security = must be set to domain or ads.
#
# passdb backend = the backend used to store user information in. New
# installations should use either tdbsam or ldapsam. No additional
configuration # is required for tdbsam. The "smbpasswd" utility is
available for backwards # compatibility.
#
# realm = only use the realm option when the "security = ads" option is set.
# The realm option specifies the Active Directory realm the host is a part of.
#
# password server = only use this option when the "security = server"
# option is set, or if you cannot use DNS to locate a Domain
#
# password server = My_PDC_Name [My_BDC_Name] [My_Next_BDC_Name] # #
Use "password server = *" to automatically locate Domain Controllers.
; security = domain
; passdb backend = tdbsam
; realm = MY_REALM
; password server = <NT-Server-Name>
# ----------------------- Domain Controller Options
------------------------ # # security = must be set to user for domain
controllers.
#
# passdb backend = the backend used to store user information in. New
# installations should use either tdbsam or ldapsam. No additional
configuration # is required for tdbsam. The "smbpasswd" utility is
available for backwards # compatibility.
#
# domain master = specifies Samba to be the Domain Master Browser,
allowing # Samba to collate browse lists between subnets. Do not use the "domain master"
# option if you already have a Windows NT domain controller performing this task.
#
# domain logons = allows Samba to provide a network logon service for
Windows # workstations.
#
# logon script = specifies a script to run at login time on the
client. These # scripts must be provided in a share named NETLOGON.
#
# logon path = specifies (with a UNC path) where user profiles are stored.
#
#
; security = user
; passdb backend = tdbsam
; domain master = yes
; domain logons = yes
# the following login script name is determined by the machine name
; logon script = %m.bat
; logon script = %u.bat
; logon path = \\%L\Profiles\%u
; logon path =
# various scripts can be used on a domain controller or a stand-alone
; add user script = /usr/sbin/useradd "%u" -n -g users
; add group script = /usr/sbin/groupadd "%g"
; add machine script = /usr/sbin/useradd -n -c "Workstation (%u)" -M -d /nohome -s /bin/false "%u"
; delete user script = /usr/sbin/userdel "%u"
; delete user from group script = /usr/sbin/userdel "%u" "%g"
; delete group script = /usr/sbin/groupdel "%g"
# ----------------------- Browser Control Options
---------------------------- # # local master = when set to no, Samba
does not become the master browser on # your network. When set to yes,
normal election rules apply.
#
# os level = determines the precedence the server has in master
browser # elections. The default value should be reasonable.
#
# preferred master = when set to yes, Samba forces a local browser
election at # start up (and gives itself a slightly higher chance of winning the election).
#
; local master = no
; os level = 33
; preferred master = yes
#----------------------------- Name Resolution
------------------------------- # # This section details the support
for the Windows Internet Name Service (WINS).
#
# Note: Samba can be either a WINS server or a WINS client, but not both.
#
# wins support = when set to yes, the NMBD component of Samba enables
its WINS # server.
#
# wins server = tells the NMBD component of Samba to be a WINS client.
#
# wins proxy = when set to yes, Samba answers 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.
#
# dns proxy = when set to yes, Samba attempts to resolve NetBIOS names
via DNS # nslookups.
; wins support = yes
; wins server = w.x.y.z
; wins proxy = yes
; dns proxy = yes
# --------------------------- Printing Options
----------------------------- # # The options in this section allow
you to configure a non-default printing # system.
#
# load printers = when set you yes, the list of printers is
automatically # loaded, rather than setting them up individually.
#
# cups options = allows you to pass options to the CUPS library.
Setting this # option to raw, for example, allows you to use drivers on your Windows clients.
#
# printcap name = used to specify an alternative printcap file.
#
; printcap name = /etc/printcap
; printcap name = lpstat
; printing = cups
# --------------------------- File System Options
--------------------------- # # The options in this section can be
un-commented if the file system supports # extended attributes, and
those attributes are enabled (usually via the # "user_xattr" mount
option). These options allow the administrator to specify # that DOS
attributes are stored in extended attributes and also make sure that #
Samba does not change the permission bits.
#
# Note: These options can be used on a per-share basis. Setting them
globally # (in the [global] section) makes them the default for all shares.
; map archive = no
; map hidden = no
; map read only = no
; map system = no
; store dos attributes = yes
#============================ Share Definitions
==============================
;[homes]
; comment = Home Directories
; browseable = no
; writable = yes
; valid users = %S
; valid users = MYDOMAIN\%S
[printers]
comment = All Printers
path = /var/spool/samba
browseable = no
guest ok = no
writable = no
printable = yes
; [netlogon]
; comment = Network Logon Service
; path = /var/lib/samba/netlogon
; guest ok = yes
; writable = no
; share modes = no
# Un-comment the following to provide a specific roving profile share.
; [Profiles]
; path = /var/lib/samba/profiles
; browseable = no
; guest ok = yes
# A publicly accessible directory that is read only, except for users
; [public]
; comment = Public Stuff
; path = /home/samba
; public = yes
; writable = yes
; printable = no
; write list = +staff
[ftpshares]
writeable = yes
path = /mnt/fs/ftps
force create mode = 0766
browsable = yes
force directory mode = 0766
eric krause | network engineer
ringside.cutters.flavor.picnic.moonlink
248 548 2500 w
248 217 3782 c
ringsidecreative.com
<http://ringsidecreative.com/>

Wouldn't you be better setting the permissions from windows ?

See here for more info:
https://wiki.samba.org/index.php/Shares_with_Windows_ACLs

Having said that, there are a couple of things in your smb.conf that I think you need to look at. Do you really understand what you have set in 'socket options' ? are you sure you need this line ?

Second thing is a definite problem, you have:

idmap config * : range = 100000-199999

and:

idmap config RSC : range = 100000-199999

These ranges are not supposed to overlap, never mind overlap, both your ranges are exactly the same, you need to change one.

Rowland



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eric krause | network engineer
ringside.cutters.flavor.picnic.moonlink

248 548 2500 w
248 217 3782 c

ringsidecreative.com

<http://ringsidecreative.com/>