install  samba

# apt-get install samba samba-common python-glade2 system-config-samba

config  file edit

# nano /etc/samba/smb.cnf

[global]
workgroup = WORKGROUP
server string = Samba Server %v
netbios name = ubuntu
security = user
map to guest = bad user
dns proxy = no
#============================ Share Definitions ============================== 
[Anonymous]
path = /samba/anonymous
browsable =yes
writable = yes
guest ok = yes
read only = no

-------------------------------
# mkdir -p /samba/anonymous
#service smbd restart

Check the permission for the shared folder.

root@server1:~# ls -l /samba/
total 4
drwxr-xr-x 2 root root 4096 May 27 18:17 anonymous
root@server1:~#

To allow anonymous user give the permissions as follows;

root@server1:~# cd /samba
root@server1:/samba# chmod -R 0755 anonymous/
root@server1:# chown -R nobody:nogroup anonymous/
root@server1:/samba# ls -l
total 4
drwx-xr-x 2 nobody nogroup root 4096 May 27 18:17 anonymous
root@server1:/samba#

You can cross check the content at server also.

root@server1:/samba# ls -l anonymous/
total 0
-rwxr–r– 1 nobody nogroup 0 May 27 18:30 test_samba.txt
root@server1:/samba#

For this I will create a group smbgrp & user srijan to access the samba server with proper authentication

addgroup smbgrp

adduser srijan -G smbgrp

smbpasswd -a srijan

root@server1:~# smbpasswd -a srijan
New SMB password:
Retype new SMB password:
Added user srijan.
root@server1:~#

Now create the folder viz secured in the /samba folder & give permissions like this

mkdir -p /samba/secured
cd /samba
chmod -R 0770 secured/

Again edit the configuration file as :

nano /etc/samba/smb.conf

[secured]
 path = /samba/secured
 valid users = @smbgrp
 guest ok = no
 writable = yes
 browsable = yes
----------------------------------
service smbd restart 

root@server1:~# testparm 
Load smb config files from /etc/samba/smb.conf
rlimit_max: increasing rlimit_max (1024) to minimum Windows limit (16384)
Processing section "[Anonymous]"
Processing section "[secured]"
Loaded services file OK.
Server role: ROLE_STANDALONE
Press enter to see a dump of your service definitions

-----------------------------------------
Now at windows machine check the folder now with the proper credentials