Samba configuration

Configuring Samba server on Linux

Login as root

#cd /etc/samba
#cp smb.conf smbbk.conf

Then Edit smb.conf file

#vi smb.conf

# 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 (perhaps too
# many!) most of which are not shown in this example
#
# Any line which starts with a ; (semi-colon) or a # (hash)
# is a comment and is ignored. In this example we will use a #
# for commentry and a ; for parts of the config file that you
# may wish to enable
#
# 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]

# workgroup = NT-Domain-Name or Workgroup-Name
workgroup = infotech.com

# server string is the equivalent of the NT Description field
server string = Samba Server

# This option is important for security. It allows you to restrict
# connections to machines which are on your local network. The
# following example restricts access to two C class networks and
# the "loopback" interface. For more examples of the syntax see
# the smb.conf man page
; hosts allow = 192.168.1. 192.168.2. 127.

# if you want to automatically load your printer list rather
# than setting them up individually then you'll need this
printcap name = /etc/printcap
load printers = yes

# It should not be necessary to spell out the print system type unless
# yours is non-standard. Currently supported print systems include:
# bsd, sysv, plp, lprng, aix, hpux, qnx
printing = lprng

# This option tells cups that the data has already been rasterized
cups options = raw

# Uncomment this if you want a guest account, you must add this to /etc/passwd
# otherwise the user "nobody" is used
guest account = pcguest

# this tells Samba to use a separate log file for each machine
# that connects
log file = /var/log/samba/%m.log
# all log information in one file
# log file = /var/log/samba/smbd.log

# Put a capping on the size of the log files (in Kb).
max log size = 500

# Security mode. Most people will want user level security. See
# security_level.txt for details.
security = user
# Use password server option only with security = server
; password server =

# Password Level allows matching of _n_ characters of the password for
# all combinations of upper and lower case.
password level = 8
username level = 8

# You may wish to use password encryption. Please read
# ENCRYPTION.txt, Win95.txt and WinNT.txt in the Samba documentation.
# Do not enable this option unless you have read those documents
encrypt passwords = yes
; smb passwd file = /etc/samba/smbpasswd

# The following are needed to allow password changing from Windows to
# update the Linux system password also.
# NOTE: Use these with 'encrypt passwords' and 'smb passwd file' above.
# NOTE2: You do NOT need these to allow workstations to change only
# the encrypted SMB passwords. They allow the Unix password
# to be kept in sync with the SMB password.
; unix password sync = Yes
; passwd program = /usr/bin/passwd %u
; passwd chat = *New*UNIX*password* %n\n *ReType*new*UNIX*password* %n\n *passwd:*all*authentication*tokens*updated*successfully*

# Unix users can map to different SMB User names
; username map = /etc/samba/smbusers

# 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 = /etc/samba/smb.conf.%m

# Most people will find that this option gives better performance.
# See speed.txt and the manual pages for details
socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192

# Configure Samba to use multiple interfaces
# If you have multiple network interfaces then you must list them
# here. See the man page for details.
; interfaces = 192.168.12.2/24 192.168.13.2/24

# Configure remote browse list synchronisation here
# request announcement to, or browse list sync from:
# a specific host or from / to a whole subnet (see below)
; remote browse sync = 192.168.3.25 192.168.5.255
# Cause this host to announce itself to local subnets here
; remote announce = 192.168.1.255 192.168.2.44

# Browser Control Options:
# set local master to no if you don't want Samba to become a master
# browser on your network. Otherwise the normal election rules apply
; local master = no

# OS Level determines the precedence of this server in master browser
# elections. The default value should be reasonable
; os level = 33

# Domain Master specifies Samba to be the Domain Master Browser. This
# allows Samba to collate browse lists between subnets. Don't use this
# if you already have a Windows NT domain controller doing this job
; domain master = yes

# Preferred Master causes Samba to force a local browser election on startup
# and gives it a slightly higher chance of winning the election
; preferred master = yes

# Enable this if you want Samba to be a domain logon server for
# Windows95 workstations.
; domain logons = yes

# if you enable domain logons then you may want a per-machine or
# per user logon script
# run a specific logon batch file per workstation (machine)
; logon script = %m.bat
# run a specific logon batch file per username
; logon script = %U.bat

# Where to store roving profiles (only for Win95 and WinNT)
# %L substitutes for this servers netbios name, %U is username
# You must uncomment the [Profiles] share below
; logon path = \\%L\Profiles\%U

# All NetBIOS names must be resolved to IP Addresses
# 'Name Resolve Order' allows the named resolution mechanism to be specified
# the default order is "host lmhosts wins bcast". "host" means use the unix
# system gethostbyname() function call that will use either /etc/hosts OR
# DNS or NIS depending on the settings of /etc/host.config, /etc/nsswitch.conf
# and the /etc/resolv.conf file. "host" therefore is system configuration
# dependant. This parameter is most often of use to prevent DNS lookups
# in order to resolve NetBIOS names to IP Addresses. Use with care!
# The example below excludes use of name resolution for machines that are NOT
# on the local network segment
# - OR - are not deliberately to be known via lmhosts or via WINS.
; name resolve order = wins lmhosts bcast

# Windows Internet Name Serving Support Section:
# WINS Support - Tells the NMBD component of Samba to enable it's WINS Server
; wins support = yes

# 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

# WINS Proxy - Tells Samba to answer 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.
; wins proxy = yes

# DNS Proxy - tells Samba whether or not to try to resolve NetBIOS names
# via DNS nslookups. The built-in default for versions 1.9.17 is yes,
# this has been changed in version 1.9.18 to no.
dns proxy = no

# Case Preservation can be handy - system default is _no_
# NOTE: These can be set on a per share basis
; preserve case = no
; short preserve case = no
# Default case is normally upper case for all DOS files
; default case = lower
# Be very careful with case sensitivity - it can break things!
; case sensitive = no

#============================ Share Definitions ==============================
idmap uid = 16777216-33554431
idmap gid = 16777216-33554431
template shell = /bin/false
winbind use default domain = no
[homes]
comment = INFRA
path = /home
valid users = %S (Aravindan ramesh KK don’t use comma)
public = no
printable = no
create mask = 0765
browseable = no
writable = yes

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


# NOTE: If you have a BSD-style print system there is no need to
# specifically define each individual printer
[printers]
comment = All Printers
path = /var/spool/samba
browseable = no
# Set public = yes to allow user 'guest account' to print
guest ok = no
writable = no
printable = yes

# This one is useful for people to share files
;[tmp]
; comment = Temporary file space
; path = /tmp
; read only = no
; public = yes

# A publicly accessible directory, but read only, except for people in
# the "staff" group
;[public]
; comment = Public Stuff
; path = /home/samba
; public = yes
; read only = yes
; write list = @staff

# Other examples.
#
# A private printer, usable only by fred. Spool data will be placed in fred's
# home directory. Note that fred must have write access to the spool directory,
# wherever it is.
;[fredsprn]
; comment = Fred's Printer
; valid users = fred
; path = /homes/fred
; printer = freds_printer
; public = no
; writable = no
; printable = yes

# A private directory, usable only by fred. Note that fred requires write
# access to the directory.
;[fredsdir]
; comment = Fred's Service
; path = /usr/somewhere/private
; valid users = fred
; public = no
; writable = yes
; printable = no

# a service which has a different directory for each machine that connects
# this allows you to tailor configurations to incoming machines. You could
# also use the %u option to tailor it by user name.
# The %m gets replaced with the machine name that is connecting.
;[pchome]
; comment = PC Directories
; path = /usr/pc/%m
; public = no
; writable = yes

# A publicly accessible directory, read/write to all users. Note that all files
# created in the directory by users will be owned by the default user, so
# any user with access can delete any other user's files. Obviously this
# directory must be writable by the default user. Another user could of course
# be specified, in which case all files would be owned by that user instead.
;[public]
; path = /usr/somewhere/else/public
; public = yes
; only guest = yes
; writable = yes
; printable = no

# The following two entries demonstrate how to share a directory so that two
# users can place files there that will be owned by the specific users. In this
# setup, the directory should be writable by both users and should have the
# sticky bit set on it to prevent abuse. Obviously this could be extended to
# as many users as required.
;[myshare]
; comment = Mary's and Fred's stuff
; path = /usr/somewhere/shared
; valid users = mary fred
; public = no
; writable = yes
; printable = no
; create mask = 0765


After saving this samba file.


Add users and set password by using this commands

#useradd –u 5001 –g 0 –o –d /home/Aravindan –m Aravindan
#useradd –u 5002 –g 0 –d /home/ramesh –m ramesh

#smbpasswd –a aravindan
#smbpasswd –a ramesh
New file smbpasswd created in /etc/samba directory

To check

#testparm /etc/samba/smb.conf

Then Start the samba service

#/etc/init.d/smb start or restart
#chkconfig smb on

Squid proxy configuratiion on LINUX

SQUID PROXY CONFIGURATION (LINUX 7.1 AND ABOVE)

Configuration file - /etc/squid/squid.conf

1. Edit squid.conf file with vi editor
2. Locate “http_port” remove the “#” and add the port number next to it(default 3128)
3. Locate “cache_mem 8 MB” and remove the “#”
4. Locate “cache_dir ufs /usr/spool/squid 100 16 256” , and remove the “#”
5. Locate “dns_nameserver”, remove the “#” and add the DNS IP next to it
6. Locate session “ACCESS CONTROLS”
7. set rule “acl all src 0.0.0.0/0.0.0.0”
8. Leave other rules as such
9. Go to “http_access”
10. set access “http_access allow all”. Give a “#” for all other rules

Last 4 steps steps will set http_access rule . Here the example is for giving access to all IP’s (i.e., 0.0.0.0/0.0.0.0). If you need additional rules to be set, set specific rules as mentioned at the end of this procedure.

Setup your client browser to point to this squid. If you face any problem, check /var/log/messages for any clue.

Note: You must restart squid for any changes in squid.conf to take effect.

To stop/start/restart the service

# /etc/rc.d/init.d/squid start

# /etc/rc.d/init.d/squid stop

# /etc/rc.d/init.d/squid restart

Setting up User based authentication with Squid.

This enables any user accessing internet through this proxy to get authenticated using username and password.

Copy /usr/lob/squid/ncsa_auth to /usr/bin/ncsa_auth

Create password file (# touch /usr/etc/passwd)

Create users for the above passwd file (use “htpasswd” command as below)

# htpasswd -c /usr/etc/passwd

Enter password for new user

User you have created as above will be authenticated for browsing. Set the below in squid.conf file

Locate “authenticate_program /usr/bin/ncsa_auth /usr/etc/passwd” and remove the “#”

Locate “authenticate_children” remove the “#” and set value 32 (which is max)

Go to “ACCESS CONTROLS”

Create a new ACL, “acl word proxy_auth REQUIRED”

Go to http_access, set access “http_access allow word”

Denying FTP access:

acl ftp proto FTP

http_access deny ftp

Denying Bad Domains:

acl baddomain dst

http_access deny baddomains

Denying access to sites with the “bad words” in the URL

acl badURL url_regex -i

http_access deny badUrl

http_access allow myNet

http_access deny all

Setting up additional IP rules for LAN users in “ACCESS CONTROL”

Set a rule for net access for only a specific range of IP

“acl mylan src 192.168.10.0/255.255.255.0”

“http_access allow mylan”

“http_access deny all”

This will allow access to all users in network “192.168.10.0” and deny all others.

Note: When you set specific rules as above; do remember to set “http_access deny all” at the end. If there are allow rules after deny all those rules will go void.

Cache Access Log

This tag is used to specify the path of the access.log file, which logs the client request activity. It contains an entry for every HTTP and ICP queries received

“cache_access_log /var/log/squid_access.log”

granting trace privilege to a user

GRANTING TRACE PRIVILEGE TO USER


1. connect to oracle as sys as sysdba
2. Run the plustrce.sql (file will in the path ORACLE_HOME\sqlplus\admin\plustrce.sql.)
For example: E:\oracle\ora92\sqlplus\admin\plustrce.sql
Please see the below screen for reference.




4. Grant the plustrace privilege to the user as below