[Samba] Force Create Mode Problems

Eric Krause ekrause at ringsidecreative.com
Tue Jun 21 16:31:41 UTC 2016

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 =====================================

                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
;               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 ==============================

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

                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

                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

248 548 2500 w
248 217 3782 c



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