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s The find command is a powerful tool for searching for particular files and objects on your system; Tip

Linux security permissions can be highly inflexible. If a user has the write permissions, or a group they belong to has write permissions to a directory, the user will be able to delete the files in that directory even if they do not own those files. This has some serious implications for directories to which more than one user or application share write permissions. In Listing 4-7 user bob belonging to the group sales can create a file in the directory /usr/sharedfiles. Listing 4-7. Sticky Bits puppy$ su bob puppy$ cd /usr/ puppy$ ls -l sharedfiles drwxrwxr-x 2 root sales puppy$ cd sharedfiles puppy$ vi bobsfile puppy$ ls -l bobsfile -rw-rw-r-1 bob bob

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.

New TryParse() methods have been added to Guid, Version and Enum types: Guid myGuid; Guid.TryParse("not a guid", out myGuid);

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

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" { 1921680200; 192168110; 192168220; }; .. 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" { 0000/8; 1000/8; 2000/8; 203281312; }; .. options { blackhole { badsource; }; }; ....

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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.

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.