UbuntuHelp:Cyrus
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目录
Introduction
Cyrus is one of the most widely used IMAP/POP servers. Cyrus is apreciated for virtualisation of mailboxes and cool stuff like server side filtering (sieve) or shared folders. It is frequently used in universities. In this howto, a basic installation of Cyrus with authentication on PAM will be explained.
Installation
Cyrus is in the main repository of Ubuntu (and as a consequence benefit fromnoal security support). Install the following packages:
cyrus21-admin cyrus21-clients cyrus21-imapd sasl2-bin(see InstallingSoftware). If you dot not have a MTA yet, this step will install
postfix. Please refer to the Postfix page for details.
Configuration
Cyrus
Cyrus configuration is done in two configurations files:/etc/imapd.confand
/etc/cyrus.conf. First, edit the
/etc/cyrus.confto activate the protocols you want. Here, imap and imaps will be activated:
8<---------------------------------------- SERVICES { # --- Normal cyrus spool, or Murder backends --- # add or remove based on preferences imap cmd="imapd -U 30" listen="imap" prefork=0 maxchild=100 imaps cmd="imapd -s -U 30" listen="imaps" prefork=0 maxchild=100 #pop3 cmd="pop3d -U 30" listen="pop3" prefork=0 maxchild=50 #pop3s cmd="pop3d -s -U 30" listen="pop3s" prefork=0 maxchild=50 8<----------------------------------------Then edit
/etc/imapd.conf(do not believe the name, it concerns general Cyrus stuff configuration). Only some parameters will be focused as most of options will match most of the needs.
8<---------------------------------------- # UNIX Hierarchy Convention # Set to yes, and cyrus will accept dots in names, and use the forward # slash "/" to delimit levels of the hierarchy. This is done by converting # internally all dots to "^", and all "/" to dots. So the "rabbit.holes" # mailbox of user "helmer.fudd" is stored in "user.elmer^fud.rabbit^holes" unixhierarchysep: no 8<----------------------------------------By default, unixhierarchysep if set to
no
which means that the separator is "." and not "/". You will have to turn in to yesif you want your mailbox to contains "." for example if you use mail addresses for naming your mailboxes.
8<---------------------------------------- # Uncomment the following and add the space-separated users who # have admin rights for all services. admins: cyrus 8<----------------------------------------
This parameter define an administrator for all the services. It will be require for administration operations like mailbox creation.
8<---------------------------------------- # Do note that, since sasl will be run as user cyrus, you may have a lot of # trouble to set this up right. sasl_pwcheck_method: saslauthd 8<----------------------------------------Indicates the method used for user authentication.
saslauthdcan also be used for Postfix authentication, as detailed in Postfix page. Last, change the
/etc/default/saslauthd:
# This needs to be uncommented before saslauthd will be run automatically START=yes # You must specify the authentication mechanisms you wish to use. # This defaults to "pam" for PAM support, but may also include # "shadow" or "sasldb", like this: MECHANISMS="pam"
Your authentication will be based on PAM. Probabily PAM is correctly setup on your machine.
Just launchsaslauthddaemon:
# /etc/init.d/saslauthd start
Mail Transfert Agent
You have to configure your mail transfert agent to deliver your messages in yocyrusilbox. In this howto, Postfix MTA will be presented. Feel free to add you favorite MTA.
Postfix
With postfix, there are two ways of delivering messages in you mailbox: with a special transport namcyrusr v
lmtphich is a protocol more or less similar to smtp). Choose the one you prefer. The
cyrus
transport is the simplest, lmtp
is the most powerfull (you can communicate with lmtp between machines).
cyrus transport
In your postfixmain.cfconfiguration file, add the following line:
mailbox_transport = cyrusOn Ubuntu installation, the transport
cyrus
is NOT already configured in /etc/postfix/master.cf. You must add manually at the end of
master.cfthe following lines:
# The Cyrus deliver program has changed incompatibly, multiple times. cyrus unix - n n - - pipe flags=R user=cyrus argv=/usr/sbin/cyrdeliver -e -m "${extension}" ${user}
lmtp
In your postfixmain.cfconfiguration file, add the following line:
mailbox_transport = lmtp:unix:/var/run/lmtpBy default, on Ubuntu, the Unix socket lmtp is opened. Make sure the socket matches the socket specified in your
/etc/cyrus.confand
/etc/imapd.conf. In your postfix
master.cfconfiguration file, edit the following line:
lmtp unix - - - - - lmtp
to
lmtp unix - - n - - lmtpOtherwise, "No such file or directory" errors will be logged in the
/var/log/mail.logas postfix tries to look for the socket in a chrooted environment.
Mailbox creation
First, you have define a "password" for the user admin for the cyrusadm. With root make this:
# saslpasswd2 -c cyrus Password: TYPE YOUR CYRUS PASSWORD HERE Again (for verification): RETYPE YOUR CYRUS PASSWORDYou also have to create the mailboxes for the users. User the
cyradmutility for that:
cyradm --user cyrus localhost IMAP Password: localhost>You can have the full description of the commands available by typing
help. We will give more details in the section Administration & Maintenance.
Mailbox creation is done like this:
localhost>cm user.totoDot not forget the prefix
user.or the mailbox created will be considered as a shared mailbox.
Test
Test that your installation works correctly:
# telnet localhost imap Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. * OK hostname Cyrus IMAP4 v2.1.18-IPv6-Debian-2.1.18-2ubuntu2 server ready imap login user password imap OK User logged inWhere user and password are your login and password on the server. If it does not work check
/var/log/mail.logfor evidence.
Administration / Maintenance
Links
Postfix Cyrus Web cyradm HOWTO