Cannot access ext4 external drive from a Windows 8 laptop

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Cannot access ext4 external drive from a Windows 8 laptop

Postby jvhm on Sat Feb 16, 2013 6:39 pm

Hello everyone!

I'm having an issue with Samba recently, regarding sharing an ext4 external drive and accessing it through a Windows 8 laptop.

The problem is: I have a Linux Mint 14 laptop and, connected to it, a USB Hard Drive formated as ext4. I need to access this Hard Drive through a local network (Samba sharing), but I just can't do it. I can see the actual folder in my Windows 8 system, but when I try to access it, I receive a message that I don't have permissions to do that. As far as I know, Samba is working fine in my Mint, as I can actually see all the folders that I share through my network and, also, if I share some folder that is not inside my USB drive (let's say, some folder inside my Home directory), it works perfectly fine: I can access it without any trouble in Windows 8.

I've benn searching for a solution for that, but got no lucky until now. Here's my /etc/samba/smb.conf file:

Code: Select all
#
# 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.
# A well-established practice is to name the original file
# "smb.conf.master" and create the "real" config file with
# testparm -s smb.conf.master >smb.conf
# This minimizes the size of the really used smb.conf file
# which, according to the Samba Team, impacts performance
# However, use this with caution if your smb.conf file contains nested
# "include" statements. See Debian bug #483187 for a case
# where using a master file is not a good idea.
#

#======================= 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, LinuxMint)

# 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

# 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 director 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
# The following parameter makes sure that only "username" can connect
#
# 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

;    wins support = no
    username map = /etc/samba/smbusers
[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

# 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
#
;   preexec = /bin/mount /cdrom
;   postexec = /bin/umount /cdrom


[JVHMHD]
    path = /media/jvhm/JVHMHD-1TB
;    available = yes
;    browseable = yes
    public = yes
;    writable = no


JVHMHD-1TB is the name of my USB drive. If I try to share directly some folder inside of it, the result is the same.
I'd appreciate any response!
Best regards!
jvhm
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Joined: Sat Feb 16, 2013 6:23 pm

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Re: Cannot access ext4 external drive from a Windows 8 lapto

Postby altair4 on Sun Feb 17, 2013 8:52 am

The problem isn't Samba. The problem is Linux.

Take a loot at the permissions of /media/jvhm:
Code: Select all
ls -dl /media/jvhm

It should look something like this:
drwxr-x---+ 2 root root 4096 Jan 30 19:25 /media/jvhm

Doesn't look good does it - unless you're root. Notice that "+" at the end of the permissions? It's using Access Control Lists to determine who has access and the only one who has access is "jvhm". A very complicated solution to a problem that doesn't exist.

I would suggest the following. Edit your share definition to look like this:
[JVHMHD]
path = /media/jvhm/JVHMHD-1TB
; available = yes
; browseable = yes
public = yes
; writable = no
force user = jvhm

Then restart samba:
Code: Select all
sudo service smbd restart


Wait a few minutes and try it again. THe remote user will be converted to jvhm and then have access.
Please add a [SOLVED] at the end of your original subject header if your question has been answered and solved.
altair4
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Re: Cannot share external drive at all <SOLVED>

Postby maelstrom666 on Thu Feb 28, 2013 3:55 am

I'm having the same problem with external drives, except I'm not even using windows, AND the other computer has the exact same 64bit Mint Nadia + Cinnamon AND same user id (but different computer name obviously)

I can easily share another folder I own (Public for example) by right clicking and going to Sharing Options because they've made that easy to do. I can even mount it on the same computer lol so you know it works

Permissions for my ext drive are at 777 (drwxrwxrwx) and my username (not root) is both the owner and group, which matches the other Mint computer username too

I've noticed that Mint hasn't added my share to smb.conf so...

Question 1 - Is it necessary for me to do so? (fyi I've already tried with no luck, but if I should leave it there, please let me know)

Question 2 - Should the external drive be mounted on startup instead of automounted, and should the mount point be different from the default?


Thanks
Last edited by maelstrom666 on Sat Mar 02, 2013 12:22 am, edited 1 time in total.
maelstrom666
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Re: Cannot access ext4 external drive from a Windows 8 lapto

Postby altair4 on Thu Feb 28, 2013 7:34 am

I'm going to assume that you are using Mint14 since at the moment it's the only one that fits your symptoms.

It's the exact same problem with the exact same fix except in your case the "force user" line is placed in another location. Edit smb.conf and add the following line right under the workgroup line:
Code: Select all
force user = your-user-name

Then restart samba:
Code: Select all
sudo service smbd restart


BTW, There are two different methods used to create a Samba share:

Samba Classic Share = share definition is in /etc/samba/smb.conf
Samba Usershare = share definition is in /var/lib/samba/usershares - created from the File Manager

** Classic shares can be edited whereas Usershares cannot.
** Very bad idea to create a samba share using both methods on the same target folder at the same time. If you did that remove one share or the other.
Please add a [SOLVED] at the end of your original subject header if your question has been answered and solved.
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