Kerberos


This article describes how to achieve single sign on with Active Directory using Identity Management for Unix (available in Windows 2003 R2 and above) or Services for Unix 3.5.

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The Postfix Cyrus SASL support is used to authenticate remote SMTP clients to the Postfix SMTP server. Thanks to the Pluggable Authentication Modules (PAM) in Linux, we can configure Cyrus SASL to delegate the authentication process to an Active Directory server.

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LDAP authentication is available in Dovecot starting version 1.0. Since Active Directory is an implementation of LDAP directory services, we can use the LDAP authentication to authenticate Dovecot against an Active Directory server. But for users of Dovecot prior to 1.0 or those having problems with LDAP authentication, we can instead use the Kerberos authentication mechanism in Windows via the Linux PAM.

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If you weren’t able to succeed in integrating Active Directory into Linux, don’t worry. This article will show you how to test the Kerberos authentication and join the Active Directory domain manually so you can identify the problem.

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