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Current File : /usr/share/doc/dovecot-core/wiki/HowTo.Rootless.txt
Rootless Installation
=====================

It's possible to make Dovecot run under a single system user without requiring
root privileges at any point. This shouldn't be thought of as a security
feature, but instead simply as a way for non-admins to run Dovecot in their
favorite mail server. It's also useful if you just wish to test Dovecot without
messing up your system.

If you think of this as a good way to achieve security, ask yourself which is
worse:

a)

 * A very small possibility to get root privileges through Dovecot.
 * A small possibility without logging in to get into system as a
   non-privileged *dovecot* user, chrooted into an empty directory.
 * A small possibility to get user's privileges after logging in, but no
   possibility to read others' mails since they're saved with different UIDs
   (plus you might also be chrooted to your own mailbox).

b)

 * Absolutely zero possibility to get root privileges through Dovecot.
 * A small possibility to get into system as a mail user, possibly even without
   logging in, and being able to read everyone's mail (and finally gaining
   roots by exploiting some just discovered local vulnerability, unless you
   bothered to set up a special chrooted environment).

Installation
------------

Install somewhere under home directory:

---%<-------------------------------------------------------------------------
./configure --prefix=$HOME/dovecot
make
make install
---%<-------------------------------------------------------------------------

Dovecot is then started by running '~/dovecot/sbin/dovecot'. The example
configuration file exists in '~/dovecot/share/doc/dovecot/example-config/' and
needs to be copied to '~/dovecot/etc/dovecot/'.

Configuration
-------------

The important settings to change for rootless installation are:

 * Set usernames and group to the user which dovecot will be run under:

   ---%<----------------------------------------------------------------------
   default_internal_user = user
   default_login_user = user
   default_internal_group = group
   ---%<----------------------------------------------------------------------

 * Remove default chrooting from all services:

   ---%<----------------------------------------------------------------------
   service anvil {
     chroot =
   }
   service imap-login {
     chroot =
   }
   service pop3-login {
     chroot =
   }
   ---%<----------------------------------------------------------------------

 * Change listener ports:

   ---%<----------------------------------------------------------------------
   service imap-login {
     inet_listener imap {
       port = 10143
     }
     inet_listener imaps {
       port = 10993
     }
   }
   service pop3-login {
     inet_listener pop3 {
       port = 10110
     }
     inet_listener pop3s {
       port = 10995
     }
   }
   ---%<----------------------------------------------------------------------

 * Change logging destination:

   ---%<----------------------------------------------------------------------
   log_path = /home/user/dovecot.log
   ---%<----------------------------------------------------------------------

 * Instead of <passdb PAM> [PasswordDatabase.PAM.txt] use for example
   <passwd-file> [AuthDatabase.PasswdFile.txt]:

   ---%<----------------------------------------------------------------------
   passdb {
     driver = passwd-file
     args = /home/user/dovecot/etc/passwd
   }
   userdb {
     driver = passwd
   }
   ---%<----------------------------------------------------------------------

   Where the 'passwd' file contains the username and password for your login
   user:

   ---%<----------------------------------------------------------------------
   user:{PLAIN}pass
   ---%<----------------------------------------------------------------------

(This file was created from the wiki on 2019-06-19 12:42)

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