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17. You will find a brief but comprehensive presentation on root servers at http://www.root-servers.org/ presentations/rootops-gac-rio.pdf.
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Each zone statement can also contain a number of options, including many of the options that can be defined in the options statement. If you specify an option in the zone statement that is also set in the options statement, then the zone statement option will override the options statement option for that zone. Table 11-8 lists some of the key options available to the zone statement. I explained almost all these options earlier in the chapter, in a variety of different sections; where I have done this, I have referred to those sections in the table. You can read about the additional options not listed in Table 11-8 in the BIND Administrator Reference Manual.18 Table 11-8. A Selection of Zone Statement Options
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allow-notify allow-query allow-transfer notify also-notify masters forward forwarders transfer-source notify-source allow-update update-policy
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See the description in the Notify, Recursion, and Forwarding section. See the description in the Access Controls section. See the description in the Access Controls section. See the description in the Notify, Recursion, and Forwarding section. See the description in the Notify, Recursion, and Forwarding section. Species the master DNS servers for a slave zone. See the description in the Notify, Recursion, and Forwarding section. See the description in the Notify, Recursion, and Forwarding section. See the description in the Ports, Addresses, and Firewalling section. See the description in the Ports, Addresses, and Firewalling section. Specifies who is allowed to dynamically update master zones. Specifies policy for Dynamic DNS updates.
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s Note One of the areas I have not covered is the dynamic update of DNS data. This is disabled by default but can be controlled with the allow-update and update-policy access control options. See http:// www.bind9.net/Bv9ARM.ch04.html#dynamic_update and http://www.bind9.net/ Bv9ARM.ch07.html#dynamic_update_security for more details on dynamic updates.
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Transaction signatures (TSIG) provide a mechanism for verifying the identity of the DNS servers with which you are communicating.19 Before TSIG was available, the only method available to determine if information from a particular DNS server was authentic was via IP address verification. Unfortunately, IP addresses are easily spoofed and do not generally provide adequate certainty of a server s identity. TSIG adds cryptographic signatures to DNS
18. http://www.nominum.com/content/documents/bind9arm.pdf 19. TSIG is defined by RFC 2845 (http://www.faqs.org/rfcs/rfc2845.html).
CHAPTER 11 s HARDENING DNS AND BIND
transactions to authenticate those transactions. This signature acts as a shared secret between the servers that are communicating. TSIG is most commonly used to authenticate zone transfers between primary and secondary DNS servers but can also be used to secure queries, responses, and dynamic updates.
s Caution TSIG will not work for transfers between BIND servers and Microsoft DNS servers. Microsoft
DNS supports a variation of GSS-TSIG only, which is a Microsoft-proprietary implementation of secure DNS updates. It uses a different algorithm and is not compatible with TSIG.
TSIG works by signing each DNS transaction between two servers. The transaction is signed by adding a TSIG record to the DNS transaction. The TSIG record is created by hashing the contents of the DNS transaction with a key.20 This key is identical on both servers and represents the shared secret between the two servers. The sending server hashes the DNS transaction with the key. It then sends the DNS transaction and the TSIG record to the receiving server. The receiving server verifies, using its copy of the key, that the hash is valid. If it is valid, then the receiving server accepts the DNS transaction. Let s first look at an example of using TSIG. Say you have two servers, kitten.yourdomain.com with the IP address 192.168.0.2 and puppy.yourdomain.com with the IP address 192.168.0.1. You will secure zone transfers between the two servers using TSIG. The first step in doing this is to create a key that both servers will use. You can do this on either server using the dnssec-keygen command. This command is provided with the BIND distribution and allows you to generate keys for TSIG (and also for DNSSEC, which is where the name of the command comes from), as you can see in Listing 11-22. Listing 11-22. The dnssec-keygen Command kitten# dnssec-keygen -a HMAC-MD5 -b 512 -n HOST kitten_puppy.yourdomain.com Let s break down this command. The first option in the command, -a, allows you to specify the algorithm to be used to generate the key. I have specified HMAC-MD5, which is the only algorithm you can use for your TSIG keys. The -b option specifies the length of the key in bits. I have used the highest possible value, 512. I recommend you do the same. The -n option tells the dnssec-keygen command what type of key you want to generate, and I have specified HOST, which is the only appropriate type of key for TSIG transactions. Lastly I have called the key, kitten_puppy.yourdomain.com, making clear its purpose as the shared secret between these two servers. I recommend naming all your keys in a similar manner. The command in Listing 11-22 created two files: Kkitten_puppy.yourdomain.com.+157+45723.key and Kkitten_puppy.yourdomain.com.+157+45723.private. The filenames are structured like this: Kname_of_key.+algorithm_number+random_key_id.suffix They have a key name of kitten_puppy.yourdomain.com and an algorithm number of 157, which indicates the algorithm HMAC-MD5. You can ignore the random key identifier. The
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