RAC Attack - Oracle Cluster Database at Home/RAC Attack 12c/Configure Bind DNS

Enable BIND DNS to start at boot time. [root@collabn1 ~]# chkconfig named on Change named directory permissions. [root@collabn1 ~]# touch /var/named/racattack [root@collabn1 ~]# chgrp named /var/named/racattack [root@collabn1 ~]# chmod 664 /var/named/racattack [root@collabn1 ~]# chmod g+w /var/named Backup the BIND configuration file. [root@collabn1 ~]# cp /etc/named.conf /etc/named.conf.org Change /etc/named.conf permissions. [root@collabn1 ~]# chmod 664 /etc/named.conf Otherwise, the original protection may cause trouble in the restarting named step with write-protection errors in /var/log/messages. Run the following command or edit the /etc/named.conf file to change the named configuration manually. COPY/PASTE from PDF file may not work !!! Go to the RAC Attack 12c web page and copy/paste from there sed -i -e 's/listen-on .*/listen-on port 53 { 192.168.78.51; };/' \ -e 's/allow-query .*/allow-query { 192.168.78.0\/24; localhost; };\n allow-transfer { 192.168.78.0\/24; };/' \ -e '$azone "racattack" {\n type master;\n file "racattack";\n};\n\nzone "in-addr.arpa" {\n type master;\n file "in-addr.arpa";\n};' \ /etc/named.conf In bold the lines that have been modified from the default. options { listen-on port 53 { 192.168.78.51; }; listen-on-v6 port 53 { ::1; }; directory "/var/named"; dump-file "/var/named/data/cache_dump.db"; statistics-file "/var/named/data/named_stats.txt"; memstatistics-file "/var/named/data/named_mem_stats.txt"; allow-query { 192.168.78.0/24; localhost; }; allow-transfer { 192.168.78.0/24; }; recursion yes; dnssec-enable yes; dnssec-validation yes; dnssec-lookaside auto; /* Path to ISC DLV key */ bindkeys-file "/etc/named.iscdlv.key"; managed-keys-directory "/var/named/dynamic"; }; logging { channel default_debug { file "data/named.run"; severity dynamic; }; }; zone "." IN { type hint; file "named.ca"; }; include "/etc/named.rfc1912.zones"; include "/etc/named.root.key"; zone "racattack" { type master; file "racattack"; }; zone "in-addr.arpa" { type master; file "in-addr.arpa"; }; Create the zone file for the racattack domain on collabn1 by running the following command: (Copy & Paste the whole box) echo '$TTL 3H @ IN SOA collabn1 hostmaster ( 101 ; serial 1D ; refresh 1H ; retry 1W ; expire 3H ) ; minimum NS collabn1 NS collabn2 localhost A 127.0.0.1 collabn1 A 192.168.78.51 collabn1-vip A 192.168.78.61 collabn1-priv A 172.16.100.51 collabn2 A 192.168.78.52 collabn2-vip A 192.168.78.62 collabn2-priv A 172.16.100.52 collabn-cluster-scan A 192.168.78.251 collabn-cluster-scan A 192.168.78.252 collabn-cluster-scan A 192.168.78.253' \ > /var/named/racattack Create the reverse zone file on collabn1. (Copy & Paste the whole box) echo '$TTL 3H @ IN SOA collabn1.racattack. hostmaster.racattack. ( 101 ; serial 1D ; refresh 1H ; retry 1W ; expire 3H ) ; minimum NS collabn1.racattack. NS collabn2.racattack. 51.78.168.192 PTR collabn1.racattack. 61.78.168.192 PTR collabn1-vip.racattack. 51.100.16.172 PTR collabn1-priv.racattack. 52.78.168.192 PTR collabn2.racattack. 62.78.168.192 PTR collabn2-vip.racattack. 52.100.16.172 PTR collabn2-priv.racattack. 251.78.168.192 PTR collabn-cluster-scan.racattack. 252.78.168.192 PTR collabn-cluster-scan.racattack. 253.78.168.192 PTR collabn-cluster-scan.racattack.' \ > /var/named/in-addr.arpa Generate the rndc.key file. [root@collabn1 ~]# rndc-confgen -a -r /dev/urandom wrote key file "/etc/rndc.key" [root@collabn1 ~]# chgrp named /etc/rndc.key [root@collabn1 ~]# chmod g+r /etc/rndc.key [root@collabn1 ~]# ls -lrta /etc/rndc.key -rw-r----- 1 root named 77 Nov 10 09:19 /etc/rndc.key Restart the named service. [root@collabn1 ~]# service named restart Stopping named: [ OK ] Starting named: [ OK ] Check that the parameter PEERDNS is set to no in /etc/sysconfig/network-scripts/ifcfg-eth2 to prevent the resolv.conf from being overwritten by the dhcp client: DEVICE=eth2 TYPE=Ethernet UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx ONBOOT=yes NM_CONTROLLED=yes BOOTPROTO=dhcp HWADDR=xx:xx:xx:xx:xx DEFROUTE=yes PEERDNS=no PEERROUTES=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no NAME="System eth2" USERCTL=no note: I (Yury) found that the following two should be set to NO to => DEFROUTE=no, PEERROUTES=no If it was set to yes previously, restart the network and verify that the file /etc/resolv.conf contains now the correct nameservers: [root@collabn1 ~]# service network restart Shutting down interface eth0: [ OK ] Shutting down interface eth1: [ OK ] Shutting down interface eth2: [ OK ] Shutting down loopback interface: [ OK ] Bringing up loopback interface: [ OK ] Bringing up interface eth0: [ OK ] Bringing up interface eth1: [ OK ] Bringing up interface eth2: Determining IP information for eth2... done. [ OK ] /etc/resolv.conf should contain: [root@collabn1 ~]# cat /etc/resolv.conf ; generated by /sbin/dhclient-script nameserver 192.168.78.51 nameserver 192.168.78.52 search racattack Check that the master DNS on collabn1 is working. [root@collabn1 ~]# nslookup collabn-cluster-scan.racattack Server: 192.168.78.51 Address: 192.168.78.51#53 Name: collabn-cluster-scan.racattack Address: 192.168.78.251 Name: collabn-cluster-scan.racattack Address: 192.168.78.252 Name: collabn-cluster-scan.racattack Address: 192.168.78.253 Install VirtualBox Addons Prepare Linux for Oracle