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The allowanonymous and allowplaintext options both relate to the use of SASL authentication mechanisms. The first disables the SASL ANONYMOUS mechanism (which is done by default). You should ensure this remains off, as the ANONYMOUS mechanism provides no security and allows anybody to sign into your Cyrus IMAP. The second controls whether Cyrus IMAP will accept plain-text mechanisms of authentication such as PLAIN or LOGIN. Setting this to no will disable plain-text passwords unless TLS is enabled and running. This ensures that if you use plain-text authentication mechanisms, you can use them only if your connection is encrypted with TLS. I recommend setting this option to no and enabling TLS. The next three options control additional configuration items in Cyrus IMAP The server. name variable allows you to specify the hostname that Cyrus IMAP will present to incoming IMAP or POP connections. If it is not specified, then this defaults to the result of the gethostname system call. The syslog_prefix variable allows you to append a string to the process field of any Cyrus IMAP syslog entries. The last of these three entries, the temp_path variable, tells Cyrus IMAP what directory to use as its temporary directory. If this is not specified, it defaults to /tmp. The last four options in Table 9-3 control Cyrus IMAP s use of TLS. The first two entries, tls_cert_file and tls_key_file, specify the location of your server s certificate and keyfile to Cyrus IMAP. You can also specify disabled as the content of either of these options to disable TLS. The next two options, tls_ca_file and tls_ca_path, allow you to specify the location of your CA certificate file and the path that contains your CA files (including your certificate hashes).

Normally you will want to test your changes before moving them to production (or you probably should), so Windows Azure allows you to deploy applications to a staging deployment as well. To access the staging deployment, click the arrow on the right of the manage project screen to show the staging options and upload in a similar manner similar to what we just did. When you want to promote your staging application to production, click the blue sphere with the two white arrows in the middle. After accepting a confirmation that you really want to do this, Windows Azure will then move your staged application into production.

To enable TLS, you need to add these lines to your imapd.conf file. Listing 9-14 shows my imapd.conf with TLS enabled and some of the options I have been discussing added. Listing 9-14. Enabling TLS with Cyrus IMAP configdirectory: /var/imap partition-default: /var/spool/imap admins: root bob sasl_pwcheck_method: saslauthd allowplaintext: no allowanonymouslogin: no tls_cert_file: /var/imap/certs/puppy_cert.pem tls_key_file: /var/imap/certs/puppy_key.pem tls_ca_file: /var/imap/certs/CA_cert.pem tls_ca_path: /var/imap/certs/ If you have set up Cyrus IMAP in a chroot jail, you need to create, copy, or move your certificates and the directory containing your CA certificate and hashes into the chroot jail. Ensure you use the tightest permissions possible on your keys so they are not vulnerable. I generally set its permissions to 0400. Enter the following: puppy# chmod 0400 puppy_key.pem

The next configuration file, cyrus.conf, controls the master daemon. I have created one from the sample normal.conf contained in the Cyrus IMAP source package and copied it into my chroot jail as cyrus.conf. The cyrus.conf file does two important functions for you; it tells Cyrus IMAP which services (IMAP or POP, or both, for example) to start, and it tells Cyrus IMAP the location of the lmtp socket your MTA uses to inject mail into Cyrus and then the mailboxes. I will cover these two functions. The cyrus.conf man file describes the other options in the cyrus.conf file. puppy# man cyrus.conf The functions relating to starting and stopping services and specifying the location of the lmtp socket are contained in a block of configuration items called SERVICES. This block of configuration items is contained in brackets, { }. The first function the cryus.conf file performs is to tell Cyrus IMAP which services to start. As you can see in Listing 9-15, the uncommented items in the first seven lines handle this. Listing 9-15. The cyrus.conf Services SERVICES { # add or remove based on preferences # imap cmd="imapd" listen="imap" imaps cmd="imapd -s" listen="imaps" # pop3 cmd="pop3d" listen="pop3" pop3s cmd="pop3d -s" listen="pop3s" # sieve cmd="timsieved" listen="sieve"