Skip to content

LDAP Authentication

Introduction

Getting started with ldap and this mailserver we need to take 3 parts in account:

  • postfix
  • dovecot
  • saslauthd (this can also be handled by dovecot)

Variables to Control Provisioning by the Container

Have a look at the ENVIRONMENT.md for information on the default values.

postfix

  • LDAP_QUERY_FILTER_USER
  • LDAP_QUERY_FILTER_GROUP
  • LDAP_QUERY_FILTER_ALIAS
  • LDAP_QUERY_FILTER_DOMAIN
  • LDAP_QUERY_FILTER_SENDERS

saslauthd

  • SASLAUTHD_LDAP_FILTER

dovecot

  • DOVECOT_USER_FILTER
  • DOVECOT_PASS_FILTER

LDAP Setup - Kopano / Zarafa

Example Code
---
version: '2'

services:
  mail:
    image: mailserver/docker-mailserver:latest
    hostname: mail
    domainname: domain.com
    container_name: mail

    ports:
      - "25:25"
      - "143:143"
      - "587:587"
      - "993:993"

    volumes:
      - maildata:/var/mail
      - mailstate:/var/mail-state
      - ./config/:/tmp/docker-mailserver/

    environment:
      # We are not using dovecot here
      - SMTP_ONLY=1
      - ENABLE_SPAMASSASSIN=1
      - ENABLE_CLAMAV=1
      - ENABLE_FAIL2BAN=1
      - ENABLE_POSTGREY=1
      - SASLAUTHD_PASSWD=

      # >>> SASL Authentication
      - ENABLE_SASLAUTHD=1
      - SASLAUTHD_LDAP_SERVER=<yourLdapContainer/yourLdapServer>
      - SASLAUTHD_LDAP_PROTO=
      - SASLAUTHD_LDAP_BIND_DN=cn=Administrator,cn=Users,dc=mydomain,dc=loc
      - SASLAUTHD_LDAP_PASSWORD=mypassword
      - SASLAUTHD_LDAP_SEARCH_BASE=dc=mydomain,dc=loc
      - SASLAUTHD_LDAP_FILTER=(&(sAMAccountName=%U)(objectClass=person))
      - SASLAUTHD_MECHANISMS=ldap
      # <<< SASL Authentication

      # >>> Postfix Ldap Integration
      - ENABLE_LDAP=1
      - LDAP_SERVER_HOST=<yourLdapContainer/yourLdapServer>
      - LDAP_SEARCH_BASE=dc=mydomain,dc=loc
      - LDAP_BIND_DN=cn=Administrator,cn=Users,dc=mydomain,dc=loc
      - LDAP_BIND_PW=mypassword
      - LDAP_QUERY_FILTER_USER=(&(objectClass=user)(mail=%s))
      - LDAP_QUERY_FILTER_GROUP=(&(objectclass=group)(mail=%s))
      - LDAP_QUERY_FILTER_ALIAS=(&(objectClass=user)(otherMailbox=%s))
      - LDAP_QUERY_FILTER_DOMAIN=(&(|(mail=*@%s)(mailalias=*@%s)(mailGroupMember=*@%s))(mailEnabled=TRUE))
      # <<< Postfix Ldap Integration

      # >>> Kopano Integration
      - ENABLE_POSTFIX_VIRTUAL_TRANSPORT=1
      - POSTFIX_DAGENT=lmtp:kopano:2003
      # <<< Kopano Integration

      - ONE_DIR=1
      - DMS_DEBUG=0
      - SSL_TYPE=letsencrypt
      - PERMIT_DOCKER=host

    cap_add:
      - NET_ADMIN

volumes:
  maildata:
    driver: local
  mailstate:
    driver: local

If your directory has not the postfix-book schema installed, then you must change the internal attribute handling for dovecot. For this you have to change the pass_attr and the user_attr mapping, as shown in the example below:

- DOVECOT_PASS_ATTR=<YOUR_USER_IDENTIFYER_ATTRIBUTE>=user,<YOUR_USER_PASSWORD_ATTRIBUTE>=password
- DOVECOT_USER_ATTR=<YOUR_USER_HOME_DIRECTORY_ATTRIBUTE>=home,<YOUR_USER_MAILSTORE_ATTRIBUTE>=mail,<YOUR_USER_MAIL_UID_ATTRIBUTE>=uid, <YOUR_USER_MAIL_GID_ATTRIBUTE>=gid

The following example illustrates this for a directory that has the qmail-schema installed and that uses uid:

- DOVECOT_PASS_ATTRS=uid=user,userPassword=password
- DOVECOT_USER_ATTRS=homeDirectory=home,qmailUID=uid,qmailGID=gid,mailMessageStore=mail
- DOVECOT_PASS_FILTER=(&(objectClass=qmailUser)(uid=%u)(accountStatus=active))
- DOVECOT_USER_FILTER=(&(objectClass=qmailUser)(uid=%u)(accountStatus=active))