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The access file enables sendmail to filter out domains you specify as legitimate or not. With the access file, you can assign actions whenever a particular domain name satisfies your filtering. The format of a file entry is as follows: target action
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where target is the domain, user, or network that we want to track down and action is the result we want to happen when a target satisfies our filtering. Listing 15-8 shows an example access file. Listing 15-8. Filtering Out the Good Domains from the Bad ryan@example.com OK
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CHAPTER 15 LINUX MAIL SERVICES
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spamattacker.example.net 192.168.1.10 Connect:192.168.1
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REJECT RELAY REJECT
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This access file contains four lines that control how sendmail will handle email received from clients before sending it. The first line will allow emails from ryan@example.com to be sent, with the OK action. The second line will stop mail from the domain spamattacker.example.net from being sent, with the REJECT action. The third line will allow email from the computer with the IP address 192.168.1.10 to be sent using your mail server to its proper target host, with the RELAY action. The last line covers the rest of the 192.168.1 network and will reject emails from those computers, with the REJECT action. The Connect: keyword gives additional information about the source of the email. You can leave this out like in the third line and the action will still work. There are other actions that can be used, and Table 15-1 lists the common ones. Table 15-1. Actions Available for the access File
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OK REJECT RELAY DISCARD NNN your_text
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Accept local email. Reject the email and tell the sender that the sending failed. Accept the email and allow it to be relayed via SMTP. The mail server will act as a bridge to the sender s intended domain in case this server is not that domain. Drop the email. NNN is one of the errors listed in RFC821, and your_text is your own custom message.
Lines that start with # are treated as comments and are ignored by both sendmail and makemap. Whenever you change the contents of the access file, you need to recreate those contents to be placed on its database file, called access.db so the situation here is similar to that for aliases. The access.db file is the one referenced by sendmail during the filtering process and it provides a way to update that database. This enables sendmail to provide fast filtering of your rules as you have enumerated them in the access file. You can update the contents of access.db along with the rest of the database files by restarting sendmail, or you can do it manually by using the makemap command. The makemap command creates a database map equivalent of a source file, which sendmail can use. The makemap command uses the following syntax: makemap maptype resultfile < givenfile where maptype is the type of map you want to use for the resulting database map resultfile based on the source file represented by givenfile. You can use the btree value to create B-tree-formatted maps or the hash value to create hash-formatted maps. We will use the hash value for the maptype to use hash tables on the resulting database file. To update the access.db file based on the contents of the access file, enter the following at the terminal: makemap hash /etc/mail/access.db < /etc/mail/access
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CHAPTER 15 LINUX MAIL SERVICES
Once the command runs, your access.db file is updated. You can also use the makemap command to manually update the database files of both virtusertable and mailertable, which will be discussed later in this chapter. Using the access file for security is a good measure, but it is inadequate for anything serious such as protecting a mailing list. You must not rely too much on this file for security.
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