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allow-notify allow-query allow-recursion allow-transfer blackhole
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Sources allowed to notify a slave server of zone changes. This is relevant only on a slave server. Sources that can perform DNS queries on this server. Sources allowed to make recursive queries through this server. Sources allowed to receive zone transfers from the server. Sources that the server will not use for queries or query resolution.
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Let s look at several of these access controls. I have already discussed the allow-query access control, which provides control over who can query the BIND server. The allow-recursion
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CHAPTER 11 s HARDENING DNS AND BIND
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control is particularly important. It specifies the sources, if any, that will be allowed to make recursive queries to this BIND server. I will talk more about recursion in the Notify, Recursion, and Forwarding section. The allow-transfer option specifies which hosts are allowed to receive zone transfers from this host. You should limit this to only those hosts that actually need to conduct zone transfers with the server. For example, if this server is authoritative for one or more domains, then I recommend creating an acl containing the IP addresses of any slave servers and limiting the allow-transfer access control to that acl. You can see this in Listing 11-12. Listing 11-12. The allow-transfer Option acl "transfer" { 192.168.0.200; 192.168.1.10; 192.168.2.20; }; ... options { allow-transfer { transfer; }; }; ... In Listing 11-12 I have created an acl called transfer that contains the IP addresses of some hypothetical slave servers. I have then used this acl in the allow-transfer option to allow only these slave servers to receive zone transfers from this server. You can also override the allow-transfer option for an individual view or zone by specifying the option in the view or zone statement. The last access control option in Table 11-6 is blackhole. The blackhole access control option allows you to specify a list of sources that the server will never accept queries for and, importantly, will never use to resolve a query. Many people define a special acl that contains a variety of IP addresses and networks, such as bogon networks or the IP addresses of attackers, and then uses this acl in the blackhole option to block queries from these addresses.13 You can see this in Listing 11-13. Listing 11-13. The blackhole Option acl "badsource" { 0.0.0.0/8; 1.0.0.0/8; 2.0.0.0/8; 203.28.13.12; }; ... options { blackhole { badsource; }; }; ...
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13. See 2 for details of bogon networks and other potential sources to block.
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CHAPTER 11 s HARDENING DNS AND BIND
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s Note See 2 for some information on IP networks from which you should not accept queries.
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You can override all these access controls, except blackhole, by specifying the access control options in individual view or zone statements. This allows you to increase the granularity of your access control by controlling it at the individual view or zone level.
Ports, Addresses, and Firewalling
The next couple of options I will cover control the source IP addresses and ports that your BIND server will use. This can have a significant impact on how you firewall your host and how your network firewalls handle your DNS traffic. By default, when started, BIND will listen on UDP and TCP port 53 on all interfaces attached to your system. When remote clients send their query requests, they originate from ephemeral ports and connect to port 53 on the BIND server.14 The BIND server sends its replies from port 53 back to the ephemeral port on the client.
s Note I describe using iptables to firewall DNS servers in 2.
Binding to all interfaces on the BIND server is often not an ideal configuration, so you will probably want to limit the interfaces to which BIND is bound. The listen-on option addresses this requirement and allows you to specify the port and IP address on which BIND will listen. Listing 11-14 shows the listen-on option. Listing 11-14. listen-on Option listen-on { 192.168.0.100; }; You can also specify multiple IP addresses in your listen-on option to allow BIND to listen on multiple interfaces, like so: listen-on { 192.168.0.101; 203.28.13.12; }; By default BIND listens on port 53, but you can also specify a different port using the listen-on option, like so: listen-on port 1053 { 192.168.0.100; }; Finally, you can specify more than one listen-on option to provide a greater granularity of control over where BIND listens. You can see this in Listing 11-15.
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