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Defines an access control list that determines which clients can use the server. Reads an external file that contains statements in the same format as /etc/ named.conf. This is very useful when your configuration file becomes very large, as different sections can be divided into logically related files. Determines which activities of the server are logged in the logfile specified by the statement. Defines local server operational characteristics. Defines operational characteristics of other servers. Creates local DNS zones.
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Each of the following sections examines a sample statement involving one of these keywords.
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If you want to define an access control list for all hosts on the local network (10.24.58.*), you would insert this statement:
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acl local_network { 10.24.58/24 };
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Here, 24 indicates the netmask 255.255.255.0 in prefix notation. If your router is the host 10.24.58.32 and you want to prevent any access to the DNS server from that address, you would amend the preceding statement to the following:
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acl local_network { !10.24.58.32; 10.24.58/24 };
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Note that the negation of a specific address from a subnet that is also permitted must precede the definition of that subnet in the statement.
include
Since the definitions for configuring DNS zones (discussed a bit later in the zone section) can be very long for large networks, administrators often place them in a separate file so that they can be managed separately from ACL definitions and system options. Thus, to include all of the zone definitions from the file /var/named/zones.conf, you would insert the following statement into the /etc/named.conf file:
include "/var/named/zones.conf"
options
The options section sets key parameters that affect the run-time behavior of the BIND server. Typically, these are the directories in which the zone databases are stored, and the file in which the process ID of the named process is stored. The following example gives the standard options for BIND 8:
options { directory "/var/named"; pid-file "/var/named/pid"; }
Part VI:
Services, Directories, and Applications
server
The server statement defines characteristics of remote name servers. There are two main options that can be set with a server statement: whether or not a remote server is known to transmit incorrect information, and whether or not the remote server can answer multiple queries during a single request. A sample server statement would look like this:
server 10.24.58.32 { bogus yes; transfer-format many-answers; }
zone
A zone must be created for each network or subdomain that your DNS server manages. Zones can be created either as primary or secondary, depending on which server is authoritative for a particular domain. Entries for IP-to-name and name-to-IP mappings must also be included to correctly resolve both IP address and domain names. For the domain cassowary.net, the following zone entries would need to be created:
zone "cassowary.net" { type master; file "cassowary.net.db"; } zone "58.24.10.in-addr.arpa" { type master; file "cassowary.net.rev"; }
In this case, the two zone files /var/named/cassowary.net.db and /var/named/cassowary .net.rev need to be populated with host information. A sample /var/named/cassowary.net.db file would contain SOA entries like this:
@ IN SOA cassowary.net. root.cassowary.net. 2000011103 ;serial number 10800 ;refresh every three hours 1800 ;retry every 30 mins 1209600 ;Two week expiry 604800) ;Minimum one week expiry IN NS ns.cassowary.net. IN MX 10 firewall.cassowary.net. (
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IN IN IN IN IN
A 10.24.58.1 A 10.24.58.2 A 10.24.58.3 A 10.24.58.4 CNAME tazdevil
;firewall ;webserver ;webserver ;kerberos
A sample /var/named/cassowary.net.rev file would contain SOA entries like this:
@ IN SOA 58.24.10.in-addr.arpa. root.cassowary.net. 2000011103 ;serial number 10800 ;refresh every three hours 1800 ;retry every 30 mins 1209600 ;Two week expiry 604800) ;Minimum one week expiry IN NS ns.cassowary.net. IN PTR firewall.cassowary.net. IN PTR emu.cassowary.net. IN PTR quoll.cassowary.net. IN PTR tazdevil.cassowary.net. (
1 2 3 4
Each host within the domain must have an IP-to-domain mapping as well as a domain-to-IP mapping. Once a change is made to the zone file, you should increment the serial number as appropriate. Note that in addition to address (A) and pointer (PTR) records for IP address and domain names, respectively, it is also possible to identify hosts as mail exchangers (MX) and by canonical names (CNAME). The former is required to define which host is responsible for handling mail within a domain, while the latter is used to create aliases for specific machines (thus, the tazdevil Kerberos server is also known as security.cassowary.net). DNS provides a number of security features, such as options for disabling zone transfers and implementing transaction signatures. Disabling zone transfers ensures that a hacker cannot retrieve a detailed zone list and thereby identify targets to attack. Requesting many zone transfers concurrently is also a popular denial of service attack. Using transaction signatures, on the other hand, ensures that both parties in a DNS exchange (client and server) can be mutually authenticated by using digital signatures. This prevents spoofing of DNS entries from a non-authentic DNS server to clients.
Summary
In this chapter, you have learned how to configure a DNS server and how to retrieve DNS information manually using various client tools. Since DNS is the naming service for the entire Internet, you need to master the skills presented in this chapter before configuring workstations or DNS services.
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