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Chapter 6: Securing Domain Name Services (DNS)
Suppose in the fictional named.conf file excerpted in Example 6-11 we see the
following:
allow-transfer { goodmonkeys; };
This statement, which could be nested in either an options{} statement or a zone{}
statement (depending on whether it’s global or zone-specific), says that zone-trans-
fer requests will be honored only if they match the ACL goodmonkeys—i.e., only if
the requests come from 10.10.100.13 and are signed with the key mon_key.
Sources of BIND (and IS Security) Information
The guidelines and techniques we’ve covered here should give you a good start on
securing your BIND server(s). For more in-depth understanding of these techniques,
I strongly recommend you read the BIND v8 Operators’ Guide and the BIND v9
Administrators’ Reference Manual. For me at least, these are among the most useful
documents provided in any OSS package. Another excellent source of BIND security
information is Liu’s “DNS Security” slideshow. The “Resources” section at the end
of this chapter lists information about these and other BIND resources.
Equally important, every BIND user should subscribe to at least one security-advi-
sory email list. BUGTRAQ is my personal favorite, since it’s both timely and inclu-
sive (but it’s also high volume; I recommend ...