Installationsanleitung: Unterschied zwischen den Versionen
|  (→Ubuntu 14.04 Installation / Samba4) |  (→Ubuntu 14.04 Installation / Samba4) | ||
| Zeile 106: | Zeile 106: | ||
|      chown root:root /etc/dhcpd/dhcpd.keytab   |      chown root:root /etc/dhcpd/dhcpd.keytab   | ||
|      chmod 400 /etc/dhcpd/dhcpd.keytab |      chmod 400 /etc/dhcpd/dhcpd.keytab | ||
| + | Scripte erstellen | ||
| + |     cat > /usr/sbin/samba-dnsupdate.sh << "EOF" | ||
| + |     #!/bin/bash | ||
| + |     # Begin samba-dnsupdate.sh | ||
| + |     # Author: DJ Lucas <dj_AT_linuxfromscratch_DOT_org> | ||
| + |     # kerberos_creds() courtesy of Sergey Urushkin | ||
| + |     # http://www.kuron-germany.de/michael/blog/wp-content/uploads/2012/03/dhcpdns-sergey2.txt | ||
| + |     # DHCP server should be authoritative for its own records, sleep for 5 seconds | ||
| + |     # to allow unconfigured Windows hosts to create their own DNS records | ||
| + |     # In order to use this script you should disable dynamic updates by hosts that | ||
| + |     # will receive addresses from this DHCP server. Instructions are found here: | ||
| + |     # https://wiki.archlinux.org/index.php/Samba_4_Active_Directory_Domain_Controller#DHCP | ||
| + |     binPath=/usr/local/samba/bin/ | ||
| + |     sleep 5 | ||
| + |     checkvalues() | ||
| + |     { | ||
| + |         [ -z "${2}" ] && echo "Error: argument '${1}' requires a parameter." && exit 1 | ||
| + |         case ${2} in | ||
| + |                 -*) | ||
| + |                         echo "Error: Invalid parameter '${2}' passed to ${1}." | ||
| + |                         exit 1 | ||
| + |                 ;; | ||
| + | |||
| + |                 *) | ||
| + |                         return 0 | ||
| + |                 ;; | ||
| + |         esac | ||
| + |      } | ||
| + |     showhelp() | ||
| + |      { | ||
| + |     echo -e "\n"`basename ${0}` "uses samba-tool to update DNS records in Samba 4's DNS" | ||
| + |     echo "server when using INTERNAL DNS or BIND9 DLZ plugin." | ||
| + |     echo "" | ||
| + |     echo "    Command line options (and variables):" | ||
| + |     echo "" | ||
| + |     echo "      -a | --action      Action for this script to perform" | ||
| + |     echo "                         ACTION={add|delete}" | ||
| + |     echo "      -c | --krb5cc      Path of the krb5 credential cache (optional)" | ||
| + |     echo "                         Default: KRB5CC=/run/dhcpd.krb5cc" | ||
| + |     echo "      -d | --domain      The DNS domain/zone to be updated" | ||
| + |     echo "                         DOMAIN={domain.tld}" | ||
| + |     echo "      -h | --help        Show this help message and exit" | ||
| + |     echo "      -H | --hostname    Hostname of the record to be updated" | ||
| + |     echo "                         HNAME={hostname}" | ||
| + |     echo "      -i | --ip          IP address of the host to be updated" | ||
| + |     echo "                         IP={0.0.0.0}" | ||
| + |     echo "      -k | --keytab      Krb5 keytab to be used for authorization (optional)" | ||
| + |     echo "                         Default: KEYTAB=/etc/dhcp/dhcpd.keytab" | ||
| + |     echo "      -m | --mitkrb5     Use MIT krb5 client utilities" | ||
| + |     echo "                         MITKRB5={YES|NO}" | ||
| + |     echo "      -n | --nameserver  DNS server to be updated (must use FQDN, not IP)" | ||
| + |     echo "                         NAMESERVER={server.internal.domain.tld}" | ||
| + |     echo "      -p | --principal   Principal used for DNS updates" | ||
| + |     echo "                         PRINCIPAL={user@domain.tld}" | ||
| + |     echo "      -r | --realm       Authentication realm" | ||
| + |     echo "                         REALM={DOMAIN.TLD}" | ||
| + |     echo "      -z | --zone        Then name of the zone to be updated in AD. | ||
| + |     echo "                         ZONE={zonename} | ||
| + |     echo "" | ||
| + |     echo "Example: $(basename $0) -d domain.tld -i 192.168.0.x -n 192.168.0.x \\" | ||
| + |     echo "             -r DOMAIN.TLD -p user@domain.tld -H HOSTNAME -m" | ||
| + |     echo "" | ||
| + |     } | ||
| + |     # Process arguments | ||
| + |     [ -z "$1" ] && showhelp && exit 1 | ||
| + |     while [ -n "$1" ]; do | ||
| + |         case $1 in | ||
| + |                 -a | --action) | ||
| + |                         checkvalues ${1} ${2} | ||
| + |                         ACTION=${2} | ||
| + |                         shift 2 | ||
| + |                 ;; | ||
| + |                 -c | --krb5cc) | ||
| + |                         checkvalues ${1} ${2} | ||
| + |                         KRB5CC=${2} | ||
| + |                         shift 2 | ||
| + |                 ;; | ||
| + |                 -d | --domain) | ||
| + |                         checkvalues ${1} ${2} | ||
| + |                         DOMAIN=${2} | ||
| + |                         shift 2 | ||
| + |                 ;; | ||
| + |                 -h | --help) | ||
| + |                         showhelp | ||
| + |                         exit 0 | ||
| + |                 ;; | ||
| + |                 -H | --hostname) | ||
| + |                         checkvalues ${1} ${2} | ||
| + |                         HNAME=${2%%.*} | ||
| + |                         shift 2 | ||
| + |                 ;; | ||
| + |                 -i | --ip) | ||
| + |                         checkvalues ${1} ${2} | ||
| + |                         IP=${2} | ||
| + |                         shift 2 | ||
| + |                 ;; | ||
| + |                 -k | --keytab) | ||
| + |                         checkvalues ${1} ${2} | ||
| + |                         KEYTAB=${2} | ||
| + |                         shift 2 | ||
| + |                 ;; | ||
| + |                 -m | --mitkrb5) | ||
| + |                         KRB5MIT=YES | ||
| + |                         shift 1 | ||
| + |                 ;; | ||
| + |                 -n | --nameserver) | ||
| + |                         checkvalues ${1} ${2} | ||
| + |                         NAMESERVER=${2} | ||
| + |                         shift 2 | ||
| + |                 ;; | ||
| + |                 -p | --principal) | ||
| + |                         checkvalues ${1} ${2} | ||
| + |                         PRINCIPAL=${2} | ||
| + |                         shift 2 | ||
| + |                 ;; | ||
| + |                 -r | --realm) | ||
| + |                         checkvalues ${1} ${2} | ||
| + |                         REALM=${2} | ||
| + |                         shift 2 | ||
| + |                 ;; | ||
| + |                 -z | --zone) | ||
| + |                         checkvalues ${1} ${2} | ||
| + |                         ZONE=${2} | ||
| + |                         shift 2 | ||
| + |                 ;; | ||
| + | |||
| + |                 *) | ||
| + |                         echo "Error!!! Unknown command line opion!" | ||
| + |                         echo "Try" `basename $0` "--help." | ||
| + |                         exit 1 | ||
| + |                 ;; | ||
| + |         esac | ||
| + | done | ||
| + | |||
| + | # Sanity checking | ||
| + | [ -z "$ACTION" ] && echo "Error: action not set." && exit 2 | ||
| + | case "$ACTION" in | ||
| + |         add | Add | ADD) | ||
| + |                 ACTION=ADD | ||
| + |         ;; | ||
| + |         del | delete | Delete | DEL | DELETE) | ||
| + |                 ACTION=DEL | ||
| + |         ;; | ||
| + |         *) | ||
| + |                 echo "Error: invalid action \"$ACTION\"." && exit 3 | ||
| + |         ;; | ||
| + | esac | ||
| + | [ -z "$KRB5CC" ] && KRB5CC=/run/dhcpd.krb5cc | ||
| + | [ -z "$DOMAIN" ] && echo "Error: invalid domain." && exit 4 | ||
| + | [ -z "$HNAME" ] && [ "$ACTION" == "ADD" ] && \ | ||
| + |      echo "Error: hostname not set." && exit 5 | ||
| + | [ -z "$IP" ] && echo "Error: IP address not set." && exit 6 | ||
| + | [ -z "$KEYTAB" ] && KEYTAB=/etc/dhcp/dhcpd.keytab | ||
| + | [ -z "$NAMESERVER" ] && echo "Error: nameservers not set." && exit 7 | ||
| + | [ -z "$PRINCIPAL" ] && echo "Error: principal not set." && exit 8 | ||
| + | [ -z "$REALM" ] && echo "Error: realm not set." && exit 9 | ||
| + | [ -z "$ZONE" ] && echo "Error: zone not set." && exit 10 | ||
| + | |||
| + | # Disassemble IP for reverse lookups | ||
| + | OCT1=$(echo $IP | cut -d . -f 1) | ||
| + | OCT2=$(echo $IP | cut -d . -f 2) | ||
| + | OCT3=$(echo $IP | cut -d . -f 3) | ||
| + |     OCT4=$(echo $IP | cut -d . -f 4) | ||
| + |     RZONE="$OCT3.$OCT2.$OCT1.in-addr.arpa" | ||
| + |     kerberos_creds() { | ||
| + |     export KRB5_KTNAME="$KEYTAB" | ||
| + |     export KRB5CCNAME="$KRB5CC" | ||
| + |     if [ "$KRB5MIT" = "YES" ]; then | ||
| + |     KLISTARG="-s" | ||
| + |     else | ||
| + |     KLISTARG="-t" | ||
| + |     fi | ||
| + |     klist $KLISTARG || kinit -k -t "$KEYTAB" -c "$KRB5CC" "$PRINCIPAL" || { logger -s -p daemon.error -t dhcpd kinit for dynamic DNS failed; exit 11; } | ||
| + |     } | ||
| + |     add_host(){ | ||
| + |     logger -s -p daemon.info -t dhcpd Adding A record for host $HNAME with IP $IP to zone $ZONE on server $NAMESERVER | ||
| + |     $binPathsamba-tool dns add $NAMESERVER $ZONE $HNAME A $IP -k yes | ||
| + |     } | ||
| + |     delete_host(){ | ||
| + |     logger -s -p daemon.info -t dhcpd Removing A record for host $HNAME with IP $IP from zone $ZONE on server $NAMESERVER | ||
| + |     $binPathsamba-tool dns delete $NAMESERVER $ZONE $HNAME A $IP -k yes | ||
| + |     } | ||
| + |     update_host(){ | ||
| + |     CURIP=$(host -t A $HNAME | cut -d " " -f 4) | ||
| + |     logger -s -p daemon.info -t dhcpd Removing A record for host $HNAME with IP $CURIP from zone $ZONE on server $NAMESERVER | ||
| + |     $binPathsamba-tool dns delete $NAMESERVER $ZONE $HNAME A $CURIP -k yes | ||
| + |     add_host | ||
| + |     } | ||
| + |     add_ptr(){ | ||
| + |     logger -s -p daemon.info -t dhcpd Adding PTR record $OCT4 with hostname $HNAME to zone $RZONE on server $NAMESERVER | ||
| + |     $binPathsamba-tool dns add $NAMESERVER $RZONE $OCT4 PTR $HNAME.$DOMAIN -k yes | ||
| + |     } | ||
| + |     delete_ptr(){ | ||
| + |     logger -s -p daemon.info -t dhcpd Removing PTR record $OCT4 with hostname $HNAME from zone $RZONE on server $NAMESERVER | ||
| + |     $binPathsamba-tool dns delete $NAMESERVER $RZONE $OCT4 PTR $HNAME.$DOMAIN -k yes | ||
| + |     } | ||
| + |     update_ptr(){ | ||
| + |     CURHNAME=$(host -t PTR $OCT4 | cut -d " " -f 5) | ||
| + |     logger -s -p daemon.info -t dhcpd Removing PTR record $OCT4 with hostname $CURHNAME from zone $RZONE on server $NAMESERVER | ||
| + |     $binPathsamba-tool dns delete $NAMESERVER $RZONE $OCT4 PTR $CURHNAME -k yes | ||
| + |     add_ptr | ||
| + |     } | ||
| + |     case "$ACTION" in | ||
| + |     ADD) | ||
| + |         kerberos_creds | ||
| + |         host -t A $HNAME.$DOMAIN > /dev/null | ||
| + |         if [ "${?}" == 0 ]; then | ||
| + |             update_host | ||
| + |         else | ||
| + |             add_host | ||
| + |         fi | ||
| + |         host -t PTR $IP > /dev/null | ||
| + |         if [ "${?}" == 0 ]; then | ||
| + |             update_ptr | ||
| + |         else | ||
| + |             add_ptr | ||
| + |         fi | ||
| + |     ;; | ||
| + |     DEL) | ||
| + |         kerberos_creds | ||
| + |         host -t A $HNAME.$DOMAIN > /dev/null | ||
| + |         if [ "${?}" == 0 ]; then | ||
| + |             delete_host | ||
| + |         fi | ||
| + | |||
| + |         host -t PTR $IP > /dev/null | ||
| + |         if [ "${?}" == 0 ]; then | ||
| + |             delete_ptr | ||
| + |         fi | ||
| + |     ;; | ||
| + |     *) | ||
| + |         echo "Error: Invalid action '$ACTION'!" && exit 12 | ||
| + |     ;; | ||
| + |     esac | ||
| + |     # End samba-dnsupdate.sh | ||
| + |     EOF | ||
| + |     chmod 750 /usr/sbin/samba-dnsupdate.sh | ||
| == Einzelnachweise == | == Einzelnachweise == | ||
| <references /> | <references /> | ||
Version vom 6. Januar 2015, 20:10 Uhr
Inhaltsverzeichnis
Debian
Debian 5 Installation (VMware)
- Installation mit Netzwerkspiegel
- CD bereitstellen
- aptitude install psmisc (Killproc VMware)
- aptitude install gcc-4.1 + link
- aptitude install Linux-headers-2.6.26-2-all-amd64
- aptitude install make
- Install vmwaretool
Hinweis:
- Debian Source /etc/apt/sources.list (apt-get update)
- aptitude search …
Debian 6 Installation (VMware)
- Installation mit Netzwerkspiegel
- CD bereitstellen
- aptitude install gcc-4.3 + link
- aptitude install Linux-headers-…-2-all-amd64
- aptitude install make
- Install vmwaretool
Ubuntu
Ubuntu 14.04 Installation / Samba4
- Ubuntu 14.04 Server Standard durchführen (OpenSSH Server auswählen).
- Password für den Root-User setzen.
sudo passwd root
- statische IP-Adresse in der Datei /etc/network/interface setzen.
face eth0 inet static Ub address 172.16.41.200 netmaster 255.255.255.0 network 172.16.41.0 broadcast 172.16.41.255 gateway 172.16.41.2 dns-nameservers 172.16.41.200 8.8.8.8 dbs-serach corp.net
- Hostnamen setzen (/etc/hosts).
172.16.41.200 selb-main1.corp.net echo selb-main1.corp.net > /etc/hostname
- Softwareupdate durchführen.
apt-get update && apt-get upgrade -y
- Softwarepakete installieren (Konfiguration Kerberos 2x selb-main1).
apt-get install git build-essential libacl1-dev libattr1-dev libblkid-dev libgnutls-dev libreadline-dev python-dev python-dnspython gdb pkg-config libpopt-dev libldap2-dev dnsutils libbsd-dev attr krb5-user docbook-xsl libcups2-dev libpam0q-dev ntp -u
- Aktuelle Samba4 Version von Samba.org laden.
git clone -b v4-2-stable git://git.samba.org/samba.git samba4 (wird im aktuellen Verzeichnis abgelegt)
- Software kompilieren und installieren.
cd samba4 ./configure —enable-debug —enable-selftest make make install
- Domaine erstelle.
cd /usr/local/samba/bin/samba/bin samba-tool domain provision —realm=albatec-al.net —domain=CORP.NET —adminpass=„Server123“ —server-role=dc —dns-backend=SAMBA_INTERNAL
- Samba starten.
/usr/local/samba/sbin/samba
- Sambaversionen überprüfen, müssen identisch sein.
/usr/local/samba/sbin/samba -V /usr/local/samba//bin/smbclient -V
- Samba Funktionalität überprüfen.
/usr/local/samba//bin/smbclient -L localhost -U% /usr/local/samba//bin/smbclient //localhost/netlogon -UAdministrator%“Server123“ -c ‚ls’
- Namensauflösung anpassen.
echo domain CORP.NET >> /etc/resolv.conf
- DNS Forwarder in Sambakonfiguratiosdatei (usr/local/samba/etc/smb.conf) ändern.
dns forwarder = 8.8.8.8
- Kerberos konfigurieren (/usr/local/samba/share/setup/krb5.conf).
default_realm = CORP.NET
- Kerberos überprüfen.
kinit adminiatrator@CORP.NET klist -e
- Zeitserver konfigurieren (/etc/ntp.conf).
- Userverzeichnis erstellen und konfigurieren.
mkdir -m 770 /Users chmod g+s /Users chown root:users /Users
- Userverzeichnis mit Samba bereitstellen.
   [Users]
       directory_mode: parameter = 0700
       read only = No
       path = /Users
       csc policy = documents
- Ablauf des Passworts für den Administrator deaktivieren.
samba-tool user setexpiry administrator —noexpiry
- Passwortkomplexität deaktivieren.
samba-tool domain passwordsettings set —complexity=off
- Domänverwaltung erfolgt über einen Windows-Client(Windows 7).
http://www.microsoft.com/en-us/download/details.aspx?id=7887 Feature nach der Installation aktivieren.
- Grafische Oberfläche auf dem Ubuntu-Server installieren.
agt-get install xorg gnome-core gnome-system-tools gnome-app-install
- Samba Logging konfigurieren.
   # Debug Logging information
       log level = 2
       log file = /var/log/samba/samba.log.%m
       max log size = 50
       debug timestamp = yes
- DHCP Server installieren
apt-get install isc-dhcp-server
- Sambaanpassung für DHCP [1]
Create User und add Group
samba-tool user create dhcp --description="Unprivileged user for DNS updates via DHCP server" samba-tool group addmembers DnsAdmins dhcp
Export Benutzerberechtigung
samba-tool domain exportkeytab --principal=dhcp@albatec-al.net dhcpd.keytab install -vdm 755 /etc/dhcpd mv dhcpd.keytab /etc/dhcpd/ chown root:root /etc/dhcpd/dhcpd.keytab chmod 400 /etc/dhcpd/dhcpd.keytab
Scripte erstellen
cat > /usr/sbin/samba-dnsupdate.sh << "EOF" #!/bin/bash # Begin samba-dnsupdate.sh # Author: DJ Lucas <dj_AT_linuxfromscratch_DOT_org> # kerberos_creds() courtesy of Sergey Urushkin # http://www.kuron-germany.de/michael/blog/wp-content/uploads/2012/03/dhcpdns-sergey2.txt # DHCP server should be authoritative for its own records, sleep for 5 seconds # to allow unconfigured Windows hosts to create their own DNS records # In order to use this script you should disable dynamic updates by hosts that # will receive addresses from this DHCP server. Instructions are found here: # https://wiki.archlinux.org/index.php/Samba_4_Active_Directory_Domain_Controller#DHCP binPath=/usr/local/samba/bin/ sleep 5 checkvalues() { [ -z "${2}" ] && echo "Error: argument '${1}' requires a parameter." && exit 1 case ${2} in -*) echo "Error: Invalid parameter '${2}' passed to ${1}." exit 1 ;;
               *)
                       return 0
               ;;
       esac
    }
   showhelp()
    {
   echo -e "\n"`basename ${0}` "uses samba-tool to update DNS records in Samba 4's DNS"
   echo "server when using INTERNAL DNS or BIND9 DLZ plugin."
   echo ""
   echo "    Command line options (and variables):"
   echo ""
   echo "      -a | --action      Action for this script to perform"
   echo "                         ACTION={add|delete}"
   echo "      -c | --krb5cc      Path of the krb5 credential cache (optional)"
   echo "                         Default: KRB5CC=/run/dhcpd.krb5cc"
   echo "      -d | --domain      The DNS domain/zone to be updated"
   echo "                         DOMAIN={domain.tld}"
   echo "      -h | --help        Show this help message and exit"
   echo "      -H | --hostname    Hostname of the record to be updated"
   echo "                         HNAME={hostname}"
   echo "      -i | --ip          IP address of the host to be updated"
   echo "                         IP={0.0.0.0}"
   echo "      -k | --keytab      Krb5 keytab to be used for authorization (optional)"
   echo "                         Default: KEYTAB=/etc/dhcp/dhcpd.keytab"
   echo "      -m | --mitkrb5     Use MIT krb5 client utilities"
   echo "                         MITKRB5={YES|NO}"
   echo "      -n | --nameserver  DNS server to be updated (must use FQDN, not IP)"
   echo "                         NAMESERVER={server.internal.domain.tld}"
   echo "      -p | --principal   Principal used for DNS updates"
   echo "                         PRINCIPAL={user@domain.tld}"
   echo "      -r | --realm       Authentication realm"
   echo "                         REALM={DOMAIN.TLD}"
   echo "      -z | --zone        Then name of the zone to be updated in AD.
   echo "                         ZONE={zonename}
   echo ""
   echo "Example: $(basename $0) -d domain.tld -i 192.168.0.x -n 192.168.0.x \\"
   echo "             -r DOMAIN.TLD -p user@domain.tld -H HOSTNAME -m"
   echo ""
   }
   # Process arguments
   [ -z "$1" ] && showhelp && exit 1
   while [ -n "$1" ]; do
       case $1 in
               -a | --action)
                       checkvalues ${1} ${2}
                       ACTION=${2}
                       shift 2
               ;;
               -c | --krb5cc)
                       checkvalues ${1} ${2}
                       KRB5CC=${2}
                       shift 2
               ;;
               -d | --domain)
                       checkvalues ${1} ${2}
                       DOMAIN=${2}
                       shift 2
               ;;
               -h | --help)
                       showhelp
                       exit 0
               ;;
               -H | --hostname)
                       checkvalues ${1} ${2}
                       HNAME=${2%%.*}
                       shift 2
               ;;
               -i | --ip)
                       checkvalues ${1} ${2}
                       IP=${2}
                       shift 2
               ;;
               -k | --keytab)
                       checkvalues ${1} ${2}
                       KEYTAB=${2}
                       shift 2
               ;;
               -m | --mitkrb5)
                       KRB5MIT=YES
                       shift 1
               ;;
               -n | --nameserver)
                       checkvalues ${1} ${2}
                       NAMESERVER=${2}
                       shift 2
               ;;
               -p | --principal)
                       checkvalues ${1} ${2}
                       PRINCIPAL=${2}
                       shift 2
               ;;
               -r | --realm)
                       checkvalues ${1} ${2}
                       REALM=${2}
                       shift 2
               ;;
               -z | --zone)
                       checkvalues ${1} ${2}
                       ZONE=${2}
                       shift 2
               ;;
               *)
                       echo "Error!!! Unknown command line opion!"
                       echo "Try" `basename $0` "--help."
                       exit 1
               ;;
       esac
done
- Sanity checking
[ -z "$ACTION" ] && echo "Error: action not set." && exit 2 case "$ACTION" in
       add | Add | ADD)
               ACTION=ADD
       ;;
       del | delete | Delete | DEL | DELETE)
               ACTION=DEL
       ;;
       *)
               echo "Error: invalid action \"$ACTION\"." && exit 3
       ;;
esac [ -z "$KRB5CC" ] && KRB5CC=/run/dhcpd.krb5cc [ -z "$DOMAIN" ] && echo "Error: invalid domain." && exit 4 [ -z "$HNAME" ] && [ "$ACTION" == "ADD" ] && \
echo "Error: hostname not set." && exit 5
[ -z "$IP" ] && echo "Error: IP address not set." && exit 6 [ -z "$KEYTAB" ] && KEYTAB=/etc/dhcp/dhcpd.keytab [ -z "$NAMESERVER" ] && echo "Error: nameservers not set." && exit 7 [ -z "$PRINCIPAL" ] && echo "Error: principal not set." && exit 8 [ -z "$REALM" ] && echo "Error: realm not set." && exit 9 [ -z "$ZONE" ] && echo "Error: zone not set." && exit 10
- Disassemble IP for reverse lookups
OCT1=$(echo $IP | cut -d . -f 1) OCT2=$(echo $IP | cut -d . -f 2) OCT3=$(echo $IP | cut -d . -f 3)
   OCT4=$(echo $IP | cut -d . -f 4)
   RZONE="$OCT3.$OCT2.$OCT1.in-addr.arpa"
   kerberos_creds() {
   export KRB5_KTNAME="$KEYTAB"
   export KRB5CCNAME="$KRB5CC"
   if [ "$KRB5MIT" = "YES" ]; then
   KLISTARG="-s"
   else
   KLISTARG="-t"
   fi
   klist $KLISTARG || kinit -k -t "$KEYTAB" -c "$KRB5CC" "$PRINCIPAL" || { logger -s -p daemon.error -t dhcpd kinit for dynamic DNS failed; exit 11; }
   }
   add_host(){
   logger -s -p daemon.info -t dhcpd Adding A record for host $HNAME with IP $IP to zone $ZONE on server $NAMESERVER
   $binPathsamba-tool dns add $NAMESERVER $ZONE $HNAME A $IP -k yes
   }
   delete_host(){
   logger -s -p daemon.info -t dhcpd Removing A record for host $HNAME with IP $IP from zone $ZONE on server $NAMESERVER
   $binPathsamba-tool dns delete $NAMESERVER $ZONE $HNAME A $IP -k yes
   }
   update_host(){
   CURIP=$(host -t A $HNAME | cut -d " " -f 4)
   logger -s -p daemon.info -t dhcpd Removing A record for host $HNAME with IP $CURIP from zone $ZONE on server $NAMESERVER
   $binPathsamba-tool dns delete $NAMESERVER $ZONE $HNAME A $CURIP -k yes
   add_host
   }
   add_ptr(){
   logger -s -p daemon.info -t dhcpd Adding PTR record $OCT4 with hostname $HNAME to zone $RZONE on server $NAMESERVER
   $binPathsamba-tool dns add $NAMESERVER $RZONE $OCT4 PTR $HNAME.$DOMAIN -k yes
   }
   delete_ptr(){
   logger -s -p daemon.info -t dhcpd Removing PTR record $OCT4 with hostname $HNAME from zone $RZONE on server $NAMESERVER
   $binPathsamba-tool dns delete $NAMESERVER $RZONE $OCT4 PTR $HNAME.$DOMAIN -k yes
   }
   update_ptr(){
   CURHNAME=$(host -t PTR $OCT4 | cut -d " " -f 5)
   logger -s -p daemon.info -t dhcpd Removing PTR record $OCT4 with hostname $CURHNAME from zone $RZONE on server $NAMESERVER
   $binPathsamba-tool dns delete $NAMESERVER $RZONE $OCT4 PTR $CURHNAME -k yes
   add_ptr
   }
   case "$ACTION" in
   ADD)
       kerberos_creds
       host -t A $HNAME.$DOMAIN > /dev/null
       if [ "${?}" == 0 ]; then
           update_host
       else
           add_host
       fi
       host -t PTR $IP > /dev/null
       if [ "${?}" == 0 ]; then
           update_ptr
       else
           add_ptr
       fi
   ;;
   DEL)
       kerberos_creds
       host -t A $HNAME.$DOMAIN > /dev/null
       if [ "${?}" == 0 ]; then
           delete_host
       fi
       host -t PTR $IP > /dev/null
       if [ "${?}" == 0 ]; then
           delete_ptr
       fi
   ;;
   *)
       echo "Error: Invalid action '$ACTION'!" && exit 12
   ;;
   esac
   # End samba-dnsupdate.sh
   EOF
   chmod 750 /usr/sbin/samba-dnsupdate.sh

