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Thread: Folder Permissions

  1. #1
    Join Date
    Mar 2009
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    Pittsburgh, PA
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    41
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    Ubuntu 10.04 Lucid Lynx

    Folder Permissions

    Dumb question, I was looking on my Server which I use for Samba and I was able to get into my wife's file directory. By default I should not be able to get into that directory. I did check the permissions with a ls -l and I own my shares user and group and she owns her folder user and group but I can move and work with files just as if they were my own.

    Does anyone know why this would be happening, its not a big issue but I would like to understand why this would be happening.
    Thanks.

  2. #2
    Join Date
    Jun 2007
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    1,941

    Re: Folder Permissions

    How are you mapping the drives or giving permissions within Samba? If you set the permissions in Samba correctly, you should not be able to do this. If you leave permissions in Samba open, you'll be able to modify anything openly - just depends on how you have it setup.

    Might want to put your samba config in here within [code] braces.

  3. #3
    Join Date
    Mar 2009
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    Pittsburgh, PA
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    Ubuntu 10.04 Lucid Lynx

    Re: Folder Permissions

    I was able to map a network share to my wife's directory and first it didn't prompt me for credentials, and two it opened with no issue.

    Im not sure if this makes a difference or not but my server does run BIND/DNS on the same machine. Also my wife and I are both members of the admin group. I believe that doesn't make a difference but whatever.

    As requested here is my smb.conf file

    #======================= Global Settings =======================

    [global]

    ## Browsing/Identification ###

    # Change this to the workgroup/NT-domain name your Samba server will part of
    workgroup = oberlander.local

    # server string is the equivalent of the NT Description field
    server string = %h server (HOMEKNOWLEDGE)

    # 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

    # What naming service and in what order should we use to resolve host names
    # to IP addresses
    ; name resolve order = lmhosts host wins bcast

    #### 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 #######

    # "security = user" is always a good idea. This will require a Unix account
    # in this server for every user accessing the server. See
    # /usr/share/doc/samba-doc/htmldocs/Samba3-HOWTO/ServerType.html
    # in the samba-doc package for details.
    # security = user

    guest account = nobody

    # You may wish to use password encryption. See the section on
    # 'encrypt passwords' in the smb.conf(5) manpage before enabling.
    encrypt passwords = true

    # 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@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 ###########

    # Is this machine able to authenticate users. Both PDC and BDC
    # must have this setting enabled. If you are the BDC you must
    # change the 'domain master' setting to no
    #
    ; domain logons = yes
    #
    # The following setting only takes effect if '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

    ########## Printing ##########

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

    # lpr(ng) printing. You may wish to override the location of the
    # printcap file
    ; printing = bsd
    ; printcap name = /etc/printcap

    # CUPS printing. See also the cupsaddsmb(8) manpage in the
    # cupsys-client package.
    ; printing = cups
    ; printcap name = cups

    ############ 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

    # Most people will find that this option gives better performance.
    # See smb.conf(5) and /usr/share/doc/samba-doc/htmldocs/Samba3-HOWTO/speed.html
    # for details
    # You may want to add the following on a Linux system:
    # SO_RCVBUF=8192 SO_SNDBUF=8192
    # socket options = TCP_NODELAY

    # The following parameter is useful only if you have the linpopup package
    # installed. The samba maintainer and the linpopup maintainer are
    # working to ease installation and configuration of linpopup and samba.
    ; message command = /bin/sh -c '/usr/bin/linpopup "%f" "%m" %s; rm %s' &

    # Domain Master specifies Samba to be the Domain Master Browser. If this
    # machine will be configured as a BDC (a secondary logon server), you
    # must set this to 'no'; otherwise, the default behavior is recommended.
    # domain master = auto

    # 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

    # The following was the default behaviour in sarge,
    # but samba upstream reverted the default because it might induce
    # performance issues in large organizations.
    # See Debian bug #368251 for some of the consequences of *not*
    # having this setting and smb.conf(5) for details.
    ; winbind enum groups = yes
    ; winbind enum users = yes

    # 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
    ; share modes = no

    # 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

    # A sample share for sharing your CD-ROM with others.
    ;[cdrom]
    ; comment = Samba server's CD-ROM
    ; read only = yes
    ; locking = no
    ; path = /cdrom
    ; guest ok = yes

    [matthew]
    comment = Matt's share
    read only = no
    locking = no
    path = /shares/matthew
    guest ok = no
    writable = yes
    browsable = no
    public = no

    [amanda]
    comment = Amanda's share
    read only = no
    locking = no
    path = /shares/amanda
    guest account = nobody
    guest ok = no
    writable = yes
    browsable = no
    public = no

    [public]
    comment = public share
    read only = no
    locking = no
    path = /shares/public
    guest ok = yes
    guest account = nobody
    writable = yes
    browsable = yes
    public = yes

    [media]
    comment = Media share
    read only = no
    locking = no
    path = /shares/media
    guest account = nobody
    guest ok = yes
    writable = yes
    browsable = yes
    public = yes


    # The next two parameters show how to auto-mount a CD-ROM when the
    # cdrom share is accesed. For this to work /etc/fstab must contain
    # an entry like this:
    #
    # /dev/scd0 /cdrom iso9660 defaults,noauto,ro,user 0 0
    #
    # The CD-ROM gets unmounted automatically after the connection to the
    #
    # If you don't want to use auto-mounting/unmounting make sure the CD
    # is mounted on /cdrom


    Thanks for the help.

  4. #4
    Join Date
    Mar 2009
    Location
    Pittsburgh, PA
    Beans
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    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Folder Permissions

    I was able to find the problem on both the server side and the client side.

    For anyone who stumbles on this, I changed the file permissions for the group. This will stop any access from the cli, for samba I added a line of code in the file for a "valid users =" this prompted me for credentials when connecting to my wife's share, and it will not allow me to connect with my credentials.

    Hope this helps.

  5. #5
    Join Date
    Nov 2008
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    Metro Boston
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    Kubuntu 14.04 Trusty Tahr

    Re: Folder Permissions

    Just a hint for the future. If you were using standard home directories, like /home/matthew and /home/amanda, you could have enabled the [homes] share and used that instead.

    Is there some reason your stuff is under /shares/? Do you have other things in your home directories that you don't want to share?

    See the "Special Sections" part of the smb.conf manual page ("man smb.conf" from a prompt) to learn about the [homes] share.

    If you want to enforce privacy at the OS level, both your directories should have 0700 permissions.

  6. #6
    Join Date
    Aug 2006
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    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Folder Permissions

    you need to enable
    Code:
    security = user
    it was commented out in the config
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  7. #7
    Join Date
    Mar 2009
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    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Folder Permissions

    I did think about sharing out my home directories but, since I designed my server with a data hard drive which is mounted to /shares. I seamed like a better design when I created the server.

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