Dovecot with LDAP

Before Set up Dovecot with LDAP, you should prepare Postfix with LDAP. See also “Postfix with LDAP for Dovecot”.

Install packages

$ sudo apt-get install dovecot-pop3d dovecot-lmtpd dovecot-ldap dovecot-postfix

Configuration

/etc/dovecot/dovecot.conf

This file is basic configuration. It will be not changed.

!include_try /usr/share/dovecot/protocols.d/*.protocol
dict {
}
!include conf.d/*.conf
!include_try local.conf

/etc/dovecot/dovecot-ldap.conf.ext

You configure the connection to LDAP, and mapping of LDAP attributes in this file.

Default is enable “base = ” only. The value of “base” is null.

After change;

uris = ldap://ldap01.example.org/ ldap://ldap02.example.org/
tls = yes
tls_ca_cert_file = /etc/ssl/certs/ca-certificates.crt
tls_ca_cert_dir = /etc/ssl/certs
auth_bind = yes
auth_bind_userdn = uid=%n,ou=People,dc=example,dc=org
ldap_version = 3
base = ou=People,dc=example,dc=org
deref = never
scope = subtree
user_attrs = homeDirectory=home,uidNumber=uid,gidNumber=gid
user_filter = (&(objectClass=posixAccount)(uid=%n))
pass_attrs = uid=user,userPassword=password
pass_filter = (&(objectClass=posixAccount)(uid=%n))

“user_attrs” and “user_filter” are related user account.

  • “homeDirectory”, “uidNumber” and “gidNumber” are LDAP attributes
  • “home”, “uid” and “gid” are Dovecot attributes

“pass_attrs” and “pass_filter” are related password.

  • “uid” and “userPassword” are LDAP attributes
  • “user” and “password” are Dovecot attributes.

“%n” is user part in “user@domain” of mail address. I will user account mail address. See also Variables (of Dovecot).

/etc/dovecot/conf.d/10-auth.conf

Change authentication mechanism for using LDAP.

Default;

auth_mechanisms = plain
!include auth-system.conf.ext

After change;

auth_mechanisms = plain
!include auth-ldap.conf.ext

/etc/doveconf/conf.d/10-mail.conf

Set up location of mail delivery.

Default is null.

After change;

mail_location = maildir:/var/vmail/%d/%n/Maildir

Login account is email address. (user0@example.org) But this domain name is dummy. “auth_bind_userdn” specify “uid=%n”, “%n” is account name only. If support multiple domain, follow, and change LDAP setting of userdn to using “mailAddress”, and “olcAccess”.

Check configuration

Check configuration finally with “doveconf -n” command.