5 SAMBA

5.1 Basic Configuration

First stop SAMBA.

/etc/init.d/samba stop

Copy the example SAMBA configuration file into the SAMBA directory ...

cp /usr/share/doc/python-mmc-base/contrib/samba/smb.conf /etc/samba/

... and adjust it to your needs.

vi /etc/samba/smb.conf

Set the following values in the section [global]:

workgroup = EXAMPLE
netbiosname = PDC-SRV-EXAMPLE
ldap admin dn = cn=admin,dc=example,dc=com
ldap suffix = dc=example,dc=com
logon path = \\%N\profiles\%U

Add the following lines to the section [global]:

preferred master = yes
os level = 65
wins support = yes
timeserver = yes
socket options = SO_KEEPALIVE IPTOS_LOWDELAY SO_SNDBUF=8192 SO_RCVBUF=8192
logon drive = H:
passwd program = /usr/sbin/smbldap-passwd -u %u
passwd chat = "Changing password for*\nNew password*" %n\n "*Retype new password*" %n\n
add user script = /usr/sbin/smbldap-useradd -m "%u"
add user to group script = /usr/sbin/smbldap-groupmod -m "%u" "%g"
set primary group script = /usr/sbin/smbldap-usermod -g "%g" "%u"
add group script = /usr/sbin/ambldap-groupadd -p "%g"
delete user script = /usr/sbin/smbldap-userdel "%u"
delete user from group script = /usr/sbin/smbldap-groupmod -x "%u" "%g"
delete group script = /usr/sbin/smbldap-groupdel "%g"
obey pam restrictions = no
ldap idmap suffix = ou=Users
ldap delete dn = yes
security = user

Add the following line to the section [homes]:

hide files = /Maildir/

Remove the following line from the sections [printers] and [print$]:

printer admin = root,@lpadmin

Set the following values in the section [print$]:

write list = Administrator,root,@lpadmin

Add the following line to the section [profiles]:

hide files = /desktop.ini/ntuser.ini/NTUSER.*/

Set the following values in the section [archives]:

path = /home/samba/archives

At this point the SAMBA configuration file should look like this:

     [global]
        workgroup = EXAMPLE
        netbiosname = PDC-SRV-EXAMPLE
        preferred master = yes
        os level = 65
        wins support = yes
        enable privileges = yes
        timeserver = yes
        socket options = SO_KEEPALIVE IPTOS_LOWDELAY SO_SNDBUF=8192 SO_RCVBUF=8192
        log level = 3
        null passwords = yes
        security = user
        # unix charset = ISO8859-1
        name resolve order = bcast host
        domain logons = yes
        domain master = yes
        printing = cups
        printcap name = cups
        logon path = \\%N\profiles\%U
        logon script = logon.bat
        logon drive = H:
        map acl inherit = yes
        nt acl support = yes
        passdb backend = ldapsam:ldap://127.0.0.1/
        obey pam restrictions = no

        ldap admin dn = cn=admin,dc=example,dc=com
        ldap suffix = dc=example,dc=com
        ldap group suffix = ou=Groups
        ldap user suffix = ou=Users
        ldap machine suffix = ou=Computers
        ldap idmap suffix = ou=Users
        ldap passwd sync = yes
        ldap delete dn = yes

        passwd program = /usr/sbin/smbldap-passwd -u %u
        passwd chat = "Changing password for*\nNew password*" %n\n "*Retype new password*" %n\n
       
	add user script = /usr/sbin/smbldap-useradd -m "%u"
        add user to group script = /usr/sbin/smbldap-groupmod -m "%u" "%g"
        set primary group script = /usr/sbin/smbldap-usermod -g "%g" "%u"
        add group script = /usr/sbin/ambldap-groupadd -p "%g"
        add machine script = /usr/lib/mmc/add_machine_script '%u'
        delete user script = /usr/sbin/smbldap-userdel "%u"
        delete user from group script = /usr/sbin/smbldap-groupmod -x "%u" "%g"
        delete group script = /usr/sbin/smbldap-groupdel "%g"

     [homes]
        comment = Home directories
        browseable = no
        writeable = yes
        create mask = 0700
        directory mask = 0700
	hide files = /Maildir/

     [public]
        comment = Public share
        path = /home/samba/shares/public
        browseable = yes
        public = yes
        writeable = yes

     [archives]
        comment = Backup share
        path = /home/samba/archives
        browseable = yes
        public = no
        writeable = no

     [printers]
        comment = Printers
        path = /tmp
        browseable = no
        public = yes
        guest ok = yes
        writeable = no
        printable = yes

     [print$]
        comment = Drivers
        path = /var/lib/samba/printers
        browseable = yes
        guest ok = yes
        read only = yes
        write list = Administrator,root,@lpadmin

     [netlogon]
        path = /home/samba/netlogon
        public = no
        writeable = no
        browseable = no

     [profiles]
        path = /home/samba/profiles
        writeable = yes
        create mask = 0700
        directory mask = 0700
        browseable = no
        hide files = /desktop.ini/ntuser.ini/NTUSER.*/

     [partage]
        comment = aucun
        path = /home/samba/partage
        browseable = yes
        public = no
        writeable = yes

If all went ok, the command ...

testparm

... should give no errors.

Now give SAMBA the needed credentials to write into the LDAP.

smbpasswd -w %ldap_admin_password%

E.g.:

smbpasswd -w howtoforge

The output should look like this:

Setting stored password for "cn=admin,dc=example,dc=com" in secrets.tdb

Next you need to create a SID for your workgroup.

net getlocalsid %your_workgroup%

E.g.:

net getlocalsid EXAMPLE

The output should look like this - note it down you'll need it in a few moments:

SID for domain EXAMPLE is: S-1-5-21-3159899821-123882392-54881133

Check if the SID has really been recorded into LDAP.

slapcat | grep sambaDomainName

The output should look like this:

dn: sambaDomainName=EXAMPLE,dc=example,dc=com
sambaDomainName: EXAMPLE

Now start SAMBA

/etc/init.d/samba start

5.2 LDAP Directory

First you need to create the smbldap-tools configuration file - it defines how to communicate with the LDAP server.

vi /etc/smbldap-tools/smbldap_bind.conf

The content should look like this:

slaveDN="cn=admin,dc=example,dc=com"
slavePw="howtoforge"
masterDN="cn=admin,dc=example,dc=com"
masterPw="howtoforge"

Now create the main configuration file.

vi /etc/smbldap-tools/smbldap.conf

The content should look like this (Replace the SID with your own!):

SID="S-1-5-21-3159899821-123882392-54881133"
sambaDomain="EXAMPLE"
ldapTLS="0"
suffix="dc=example,dc=com"
usersdn="ou=Users,${suffix}"
computersdn="ou=Computers,${suffix}"
groupsdn="ou=Groups,${suffix}"
idmapdn="ou=Idmap,${suffix}"
sambaUnixIdPooldn="sambaDomainName=EXAMPLE,${suffix}"
scope="sub"
hash_encrypt="SSHA"
userLoginShell="/bin/bash"
userHome="/home/%U"
userHomeDirectoryMode="700"
userGecos="System User"
defaultUserGid="513"
defaultComputerGid="515"
skeletonDir="/etc/skel"
defaultMaxPasswordAge="45"
userSmbHome="\\PDC-SRV-EXAMPLE\%U"
userProfile="\\PDC-SRV-EXAMPLE\profiles\%U"
userHomeDrive="H:"
userScript="logon.bat"
mailDomain="example.com"
smbpasswd="/usr/bin/smbpasswd"

Time to populate the LDAP diretory. This will also create the domain administrator account (Administrator)

smbldap-populate -m 512 -a Administrator

Note: You'll be asked to enter a password for the domain administrator account.

Afterwards you have to modify the uid-number for this account - otherwise you won't be able to use the mailserver with this account. Additionally we add this account to the group "Domain Users" :

smbldap-usermod -u 3000 -G "Domain Users" Administrator

5.3 NSS LDAP Configuration

In this step we configure the system to use the LDAP directory to get user and group lists.

Edit the nsswitch configuration.

vi /etc/nsswitch.conf

The content should look like this:

# /etc/nsswitch.conf
#
# Example configuration of GNU Name Service Switch functionality.
# If you have the `glibc-doc' and `info' packages installed, try:
# `info libc "Name Service Switch"' for information about this file.
passwd:         compat ldap
group:          compat ldap
shadow:         compat ldap
hosts:          files dns
networks:       files
protocols:      db files
services:       db files
ethers:         db files
rpc:            db files
netgroup:       nis

5.4 SAMBA Directories

Create the needed directories for the SAMBA server, ...

mkdir -p /home/samba/shares/public/
mkdir /home/samba/netlogon/
mkdir /home/samba/profiles/
mkdir /home/samba/partage/
mkdir /home/samba/archives/

... change the ownership and adjust the rights.

chown -R :"Domain Users" /home/samba/
chmod 777 /var/spool/samba/ /home/samba/shares/public/
chmod 755 /home/samba/netlogon/
chmod 770 /home/samba/profiles/ /home/samba/partage/
chmod 700 /home/samba/archives/

6 PAM LDAP Configuration

In this step you'll add LDAP-support to PAM.

vi /etc/pam.d/common-account

The content should look like this:

#
# /etc/pam.d/common-account - authorization settings common to all services
#
# This file is included from other service-specific PAM config files,
# and should contain a list of the authorization modules that define
# the central access policy for use on the system.  The default is to
# only deny service to users whose accounts are expired in /etc/shadow.
#
account required        pam_unix.so
account sufficient      pam_ldap.so

vi /etc/pam.d/common-auth

The content should look like this:

#
# /etc/pam.d/common-auth - authentication settings common to all services
#
# This file is included from other service-specific PAM config files,
# and should contain a list of the authentication modules that define
# the central authentication scheme for use on the system
# (e.g., /etc/shadow, LDAP, Kerberos, etc.).  The default is to use the
# traditional Unix authentication mechanisms.
#
auth    sufficient      pam_unix.so nullok_secure
auth    sufficient      pam_ldap.so use_first_pass
auth    required        pam_deny.so

vi /etc/pam.d/common-password

The content should look like this:

#
# /etc/pam.d/common-password - password-related modules common to all services
#
# This file is included from other service-specific PAM config files,
# and should contain a list of modules that define  the services to be
#used to change user passwords.  The default is pam_unix
# The "nullok" option allows users to change an empty password, else
# empty passwords are treated as locked accounts.
#
# (Add `md5' after the module name to enable MD5 passwords)
#
# The "obscure" option replaces the old `OBSCURE_CHECKS_ENAB' option in
# login.defs. Also the "min" and "max" options enforce the length of the
# new password.
password        sufficient      pam_unix.so nullok obscure min=4 max=8 md5
password        sufficient      pam_ldap.so use_first_pass use_authtok
password        required        pam_deny.so
# Alternate strength checking for password. Note that this
# requires the libpam-cracklib package to be installed.
# You will need to comment out the password line above and
# uncomment the next two in order to use this.
# (Replaces the `OBSCURE_CHECKS_ENAB', `CRACKLIB_DICTPATH')
#
# password required       pam_cracklib.so retry=3 minlen=6 difok=3
# password required       pam_unix.so use_authtok nullok md5

vi /etc/pam.d/common-session

The content should look like this:

#
# /etc/pam.d/common-session - session-related modules common to all services
#
# This file is included from other service-specific PAM config files,
# and should contain a list of modules that define tasks to be performed
# at the start and end of sessions of *any* kind (both interactive and
# non-interactive).  The default is pam_unix.
#
session required        pam_unix.so
session optional        pam_ldap.so

Afterwards reboot the system.

reboot

When the system is up again, give the group "Domain Admins" the right to add machines to the domain.

net -U Administrator rpc rights grant 'DOMAIN\Domain Admins' SeMachineAccountPrivilege

7 SSL For Mail

First prepare a configuration file with the needed information.

vi /etc/ssl/mail.cnf

Add the following content:

[ req ] 
default_bits            = 2048 
default_keyfile         = privkey.pem 
distinguished_name      = req_distinguished_name 
prompt                  = no 
string_mask             = nombstr 
x509_extensions         = server_cert
[ req_distinguished_name ] 
countryName             = DE 
stateOrProvinceName     = Niedersachsen
localityName            = Lueneburg
organizationName        = Projektfarm GmbH
organizationalUnitName  = IT
commonName              = server1.example.com
emailAddress            = postmaster@example.com
[ server_cert ] 
basicConstraints        = critical, CA:FALSE 
subjectKeyIdentifier    = hash 
keyUsage                = digitalSignature, keyEncipherment 
extendedKeyUsage        = serverAuth, clientAuth 
nsCertType              = server 
nsComment               = "mailserver"

Now create the SSL certificate ...

openssl req -x509 -new -config /etc/ssl/mail.cnf -out /etc/ssl/certs/mail.pem -keyout /etc/ssl/private/mail.key -days 365 -nodes -batch

... and adjust the rights for the key in order that only root is allowed to read it.

chmod 600 /etc/ssl/private/mail.key