Authentication in LDAP with different UID

Jose Morelli Neto jmorelli at gmail.com
Tue Jan 9 06:24:06 EST 2007 

2007/1/8, Guus Leeuw jr. <Guus.Leeuw at guusleeuwit.com>:
>
>
>
>
> Hello,

Hi Guus!

>
> First of all a couple of questions:
>
> 1)       Are you planning to manage multiple domains' mail, or just the domain.com mail?

Yes, I need to manage more two domains, like lists.domain.com and domain.org.

>
> 2)       Can you post the contents of the canonical.cf file that postfix uses for canonical mapping?

I needed to modify the configurations of canonical, because I wasn't
send mail. Now it is thus:
main.cf --------
recipient_canonical_maps = proxy:ldap:/etc/postfix/ldap/recipient_canonical.cf
sender_canonical_maps = proxy:ldap:/etc/postfix/ldap/sender_canonical.cf
main.cf --------

recipient_canonical.cf ----------
server_host = ldap://ldap.domain.com:389
bind = yes
bind_dn = cn=admin,dc=domain,dc=com
bind_pw = password

search_base = ou=users,dc=domain,dc=com
query_filter = (&(mail=%s)(objectClass=CourierMailAccount)(enableMail=Y))
result_attribute = uid
result_filter = %s at domain.com
recipient_canonical.cf ----------

sender_canonical.cf --------
server_host = ldap://ldap.domain.com:389
bind = yes
bind_dn = cn=admin,dc=domain,dc=com
bind_pw = password

search_base = ou=users,dc=domain,dc=com
query_filter = (&(uid=%s)(objectClass=CourierMailAccount)(enableMail=Y))
result_attribute = mail
sender_canonical.cf --------

As you can see in file recipient_canonical.cf, the result_filter have
@domain.com fixed. This way, it wouldn't work with virtual domains,
i'll need to add an attribute with code+domain like 12345 at domain.com.

>
> 3)       Why would you want SASL to talk to PAM for PAM to talk to LDAP? Why not do the whole thing in 1 go?


Yes, the reason is that this server directly effects the
authentication of ssh in LDAP. I Tried authenticate SASL directly in
LDAP, with this saslauthd configuration:
ldap_servers: ldap://ldap.domain.com/
ldap_version: 3
ldap_search_base: ou=users,dc=domain,dc=com
ldap_filter: uid=%u
ldap_auth_method: bind


It's works normally.

>
> I belief, you told imapd to use the PLAIN mechanism… AFAIK PLAIN is not equal to PAM in terms of mechanism… OK, PAM method, I could understand, but then again, that raises question 3.

Yes, I understand that using salauthd as method this will autenticate
on PAM (and this work). I see in imapd.conf manual, that this can
autenticate (or get an attribute) directly in LDAP, but i don't found
any example of this.

If I can get the UID from LDAP after postfix deliver via LMTP to
Cyrus, and before the Cyrus verify that the mailboxes exist (and
verify using the UID), this will work perfectly. The tests with
canonical worked, but I will need to convert the mail address
everytime, and I will have to modify my LDAP Base (~ 150.000
registers). I belive that there is an "corret way" to make this.
>
> Can you bind to the LDAP server with the uid 12345? Can you bind to LDAP with user.12345 at domain.com?

yes with uid 12345, and no with user.12345 at domain.com.

>
>
>
>
> Without answers, it would be difficult to help (for me).
>
>

I understand, also it's difficult for me to explain :)

>
> Regards,
>
> Guus
>

Thank's for your interest in this problem!

Neto.


>
> From: info-cyrus-bounces at lists.andrew.cmu.edu [mailto:info-cyrus-bounces at lists.andrew.cmu.edu] On Behalf Of Jose Morelli Neto
>  Sent: 08 January 2007 12:07
>  To: info-cyrus at lists.andrew.cmu.edu
>  Subject: Authentication in LDAP with different UID
>
>
>
>
> Hello,
>
>  I am updating the mail server at my work and in this process I decided to change the Courier-IMAP for the Cyrus-IMAP, however I still came across myself with a problem without solution (at least for me). Here, all users have an personal ID who is used to effect the authentication in some systems (also in the mail). For example, an user with the personal ID 12345 possess the mail user at domain.com
>
>
>  If I create the mailbox in cyrus with the personal ID (cm user.12345), I can connect through imap/pop3 and cyrus get access to the mailbox without problems (using as user 12345), however when sending a message for this user, postfix delivery saw LMTP for cyrus, that does not locate mailbox (with the error: lmtpunix [5514]: to verify_user (user.12345) failed: Mailbox you donate not exist). Then if I create mailbox with the user's mail ( cm user.user at domain.com), the message is delivery without problems from postfix to cyrus (that it finds mailbox), however I can't have access to mailbox saw IMAP/POP using as login the person code (12345) and only the email ( user at domain.com).
>
>  The authentication of cyrus is made by SASL using the mechanism PAM (that it validates through  LDAP).
>
>
>  It follows some configurations to facilitate the understanding:
>  /etc/imapd.conf --------------------------------------
>  configdirectory: /var/lib/imap
>  partition-default: /var/spool/imap
>  admins: cyrus
>  sievedir: /var/lib/imap/sieve
>  sendmail: /usr/sbin/sendmail
>  hashimapspool: true
>  sasl_pwcheck_method: saslauthd
>  sasl_mech_list: PLAIN
>  tls_cert_file: /usr/share/ssl/certs/cyrus-imapd.pem
>  tls_key_file: /usr/share/ssl/certs/cyrus-imapd.pem
>  tls_ca_file: /usr/share/ssl/certs/ca- bundle.crt
>  virtdomains: userid
>  defaultdomain: domain.com
>  /etc/imapd.conf --------------------------------------
>
>  /etc/postfix/main.cf --------------------------------
>  virtual_transport = lmtp:unix:/var/lib/imap/socket/lmtp
>  canonical_maps = proxy:ldap:/etc/postfix/ldap/canonical.cf
>  /etc/postfix/main.cf --------------------------------
>
>  usuário.ldif -------------------------
>  dn: uid=12345,ou=users,dc=domain,dc=com
>  uid: 12345
>  cn: Test User
>  sn: test
>  loginShell: /bin/false
>  uidNumber: 90001
>  mail: user at domain.com
>  quota: 20971520
>  gidNumber: 513
>  homeDirectory: /home/user
>  mailbox: /home/user/Maildir/
>  mailHost: siaimail10.domain.com
>  description: description
>  enableMail: S
>  objectClass: top
>  objectClass: person
>  objectClass: posixAccount
>  objectClass: shadowAccount
>  objectClass: CourierMailAccount
>  objectClass: inetLocalMailRecipient
>  usuário.ldif -------------------------
>
>
>   I tried through postfix, modify/create/use some macro (those used in master.cf: ${user} ${extension}) that it passed to cyrus the personal ID (in the place of the address) but I did not have success.
>
>   I made with the SASL authenticate in LDAP using the UID, but did not give very certain, therefore cyrus uses proper login to locate mailbox, and thus I don't deliver the message saw lmtp (therefore mailbox was with the name of the user).
>
>
>   The only thing next than I found of what necessary patch of the Kolab was one that allows (theoretically, I did not make tests) to consult the virtual domínios through ldap.
>
>  I used canonical_maps in postfix quering ldap for the mail ( user at domain.com) and returning email (12345 at dominio.com), but for virtual domains I would have to add a new attribute in LDAP with the personal ID + the domain.
>
>   Someone has experience in this integration and that it can help me?
>
>
>   thank's for attention.
>  Neto.
>
>
>  --
>  José Morelli Neto
>  http://josemorelli.net
>
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-- 
José Morelli Neto
http://josemorelli.net

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