This documentation is for Dovecot v2.x, see wiki1 for v1.x documentation.
Differences between revisions 10 and 18 (spanning 8 versions)
Revision 10 as of 2007-08-15 14:46:43
Size: 1963
Editor: TimoSirainen
Comment:
Revision 18 as of 2019-09-11 14:08:34
Size: 78
Comment: Moved to new doc
Deletions are marked like this. Additions are marked like this.
Line 1: Line 1:
= Passwd =

User is looked up using `getpwnam()` call, which usually looks into `/etc/passwd` file, but depending on [http://en.wikipedia.org/wiki/Name_Service_Switch NSS] configuration it may also look up the user from eg. LDAP database.

Most commonly used as a user database. Many systems use shadow passwords nowadays so it doesn't usually work as a password database. BSDs are an exception to this, they still set the password field even with shadow passwords.

The lookup is by default done in the primary dovecot-auth process, so if NSS is configured to do the lookups from an external server, it slows down all the other authentications while waiting for the reply. To avoid that, you can use {{{blocking=yes}}} argument to do the lookups in auth worker processes:

{{{
# NOTE: v1.0.rc23 and later only
userdb passwd {
  args = blocking=yes
}
}}}

The "blocking" name can be a bit confusing. It doesn't mean that the lookup blocks the whole dovecot-auth, exactly the opposite.

== Field overriding and extra fields ==

v1.1+ only: It's possible to override fields from passwd and add [:UserDatabase/ExtraFields:extra fields] with templates. For example:

{{{
userdb passwd {
  args = home=/var/mail/%u mail=maildir:/var/mail/%u/Maildir
}
}}}

This uses the UID and GID fields from passwd, but home directory is overridden. Also the default [:MailLocation:mail_location] setting is overridden.

== nss_ldap ==

nss_ldap can in some cases return wrong user's information and cause users to log in as each others. With 1.0.rc23 and later you can fix this by using the {{{blocking=yes}}} setting as described above.

There's a nss_ldap bug about this in [https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=154314 RedHat's Bugzilla].

A typical PAM + nss_ldap configuration looks like:

{{{
# NOTE: v1.0.rc23 and later only
  userdb passwd {
    args = blocking=yes
  }
  passdb pam {
    args = dovecot
  }
}}}
Moved to https://doc.dovecot.org/configuration_manual/authentication/passwd/

None: AuthDatabase/Passwd (last edited 2019-09-11 14:08:34 by MichaelSlusarz)