[Dovecot] Please help: LDAP configuration _almost_ works.

Wed Apr 16 12:39:39 EEST 2008

dear Rob, thank you for support!
there are small differences in mine and yours config, like:

- you do not have auth_bind_userdn defined. if i comment my out i cannot 
authenticate at all - log file:
auth(default): ldap(wojtek,192.168.0.200): unknown user
dovecot: auth(default): client out: FAIL^I1^Iuser=wojtek

- you have user_attrs = mail=user, me: user_attrs = 
homeDirectory=home,uidNumber=uid. but i do not think it make any difference.

- i did not have deref = never. do you know what does it do? i do not 
understand man ldapsearch explanation :(

Rob, could you send me your ldap config (/etc/ldap/slapd.conf) please? 
maybe i am making some simple mistake with my ldap config...

cheers, Wojtek

Rob Coward wrote:
> 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-1.0-1.2.0.el5
> 
> # 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:
>   passdb:
>     driver: ldap
>     args: /etc/dovecot-ldap.conf
>   passdb:
>     driver: ldap
>     args: /etc/dovecot-ldap-fr.conf
>   passdb:
>     driver: ldap
>     args: /etc/dovecot-ldap-se.conf
>   userdb:
>     driver: ldap
>     args: /etc/dovecot-ldap.conf
>   userdb:
>     driver: ldap
>     args: /etc/dovecot-ldap-fr.conf
>   userdb:
>     driver: ldap
>     args: /etc/dovecot-ldap-se.conf
> 
> # cat /etc/dovecot-ldap.conf
> hosts = ad.our.net
> dn=CN=Lookup,CN=Users,DC=our,DC=net
> dnpass=XXXXXXXX
> 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.
> Rob
> 
> 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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