[Dovecot] Please help: LDAP configuration _almost_ works.

Rob Coward Rob.Coward at game.co.uk
Wed Apr 16 11:16:22 EEST 2008

I cant help you with what is going wrong for you, but we use dovecot
very successfully with ldap lookups against Active Directory, using
auth_bind=yes, and it does not require anonymous connections. The
initial connection is by an un-privileged user that searches for the
user, then a 2nd connection is used, authenticating against AD as the
looked up user using the password supplied to dovecot.

Our setup looks like this:

# rpm -q dovecot

# dovecot -n
# /etc/dovecot.conf
protocols: imap pop3
login_dir: /var/run/dovecot/login
login_executable(default): /usr/libexec/dovecot/imap-login
login_executable(imap): /usr/libexec/dovecot/imap-login
login_executable(pop3): /usr/libexec/dovecot/pop3-login
login_user: dovecotlogin
login_process_size: 64
login_processes_count: 10
login_max_processes_count: 64
first_valid_uid: 97
default_mail_env: maildir:/data/shared/mailstore/%d/%n
mail_location: maildir:/data/shared/mailstore/%d/%n
mail_executable(default): /usr/libexec/dovecot/imap
mail_executable(imap): /usr/libexec/dovecot/imap
mail_executable(pop3): /usr/libexec/dovecot/pop3
mail_plugin_dir(default): /usr/lib64/dovecot/imap
mail_plugin_dir(imap): /usr/lib64/dovecot/imap
mail_plugin_dir(pop3): /usr/lib64/dovecot/pop3
auth default:
    driver: ldap
    args: /etc/dovecot-ldap.conf
    driver: ldap
    args: /etc/dovecot-ldap-fr.conf
    driver: ldap
    args: /etc/dovecot-ldap-se.conf
    driver: ldap
    args: /etc/dovecot-ldap.conf
    driver: ldap
    args: /etc/dovecot-ldap-fr.conf
    driver: ldap
    args: /etc/dovecot-ldap-se.conf

# cat /etc/dovecot-ldap.conf
hosts = ad.our.net
auth_bind = yes
ldap_version = 3
base = OU=Stores,OU=UK,DC=our,DC=net
deref = never
scope = subtree
user_attrs = mail=user
user_filter = (&(objectClass=user)(mail=%u))
pass_attrs = mail=user,userPassword=password,mail=userdb_user
pass_filter = (&(objectClass=user)(mail=%u))
user_global_uid = dovecot
user_global_gid = dovecot

We use multiple userdb / passdb definitions and ldap configs in order to
limit the searches of our AD schema to specific sub-trees, both for
performance and as there are other users elsewhere in our schema that we
dont want dovecot to allow to connect.

Hope this helps you.

On Wed, 2008-04-16 at 00:19 +0100, Wojtek Bogusz wrote:
> >> /etc/ldap/sldap.conf:
> >> access to attr=uid,homeDirectory,uidNumber
> >>         by anonymous read
> > 
> > 	I do not have this in my configuration, and dovecot does indeed use the
> > credential I provide to successfully query LDAP for the user based on
> > the (mail=%u) criteria.  However, it does not see the reply.
> > 	The fact that it does perform the query successfully implies to me that
> > it does not use an anonymous connection.  Very puzzling.
> i have no idea what dovecot is doing :-) from the log file it looks like 
> there are 2 queries to ldap: 1. to check provided password for provided 
> user name, 2. to find a user related information (and from what Steffen 
> wrote this one is done with anonymous user - correct?).
> [on the margin: why isn't it done in one query: get me the user related 
> information, i am binding with provided user and with provided password. 
> this way it would be one query for two things.]
> in my case, i cannot list user related information from ldap in 
> anonymous connection even from command line, using: ldapsearch -x -b 
> 'ou=Users,dc=frontline' '(&(objectClass=posixAccount)(uid=wojtek))' 
> homeDirectory
> so i guess that i have to workout ldap settings for anonymous query. my 
> /etc/ldap/slapd.conf related to access permissions is:
> access to dn.children="ou=Users,dc=frontline" 
> attrs=uid,homeDirectory,uidNumber
>         by anonymous read
> access to attrs=userPassword,sambaNTPassword,sambaLMPassword
>          by dn="cn=admin,dc=frontline" write
>          by anonymous auth
>          by self write
>          by * none
> access to dn.children="ou=Users,dc=frontline"
>          by dn="cn=root,ou=Users,dc=frontline" read
>          by anonymous auth
>          by self write
> access to dn.base="" by * read
> access to *
>          by dn="cn=admin,dc=frontline" write
>          by * read
> maybe the problem is here... any hints please?
> regards, Wojtek

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