[Dovecot] dovecot+LDAP/AD encoding issue

[Wiethoff, Helge]

Hello everybody,

i have a problem with dovecot+Active Directory as Authentication-Service. I am not able to use special characters (äöüß (german umlaut)) within a password. Normally I would suggest that the ldap-query is done in UTF-8 but as I debugged the auth-process, I have seen that the password is ISO-8859-1 encoded.
The "original" query (from roundcube for example) is UTF-8 encoded (I dumped the POST-Query).
So far I wasn't able to find my error by myself or by searching the web. Maybe someone of you can give me a hint :-)

Thanks and greetings from Germany,
Helge

----
dovecot --version
2.0.16
----
D-AS01:/etc/dovecot # grep -v '^ *\(#.*\)\?$' dovecot-ldap.conf.ext
uris = ldap://10.37.5.90
dn = CN=ldap-d-as01,CN=Users,DC=tfh-bochum,DC=de
dnpass = xxxx
auth_bind = yes
ldap_version = 3
base = ou=Benutzer, ou=Lehre, dc=tfh-bochum, dc=de
user_attrs = =uid=10000,=gid=10000,=home=/srv/mail/%Ld/%Ln
user_filter = mail=%u
pass_attrs = =uid=10000,=gid=10000,=home=/srv/mail/%Ld/%Ln
pass_filter = (&(mail=%u)(!(extensionAttribute3=*)))
----
dovecot -n
# 2.0.16: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.37.6-0.11-default x86_64 openSUSE 11.4 (x86_64)
auth_debug = yes
auth_mechanisms = plain login
auth_username_translation = %Lu
auth_verbose = yes
mail_location = maildir:~/Maildir
mail_max_userip_connections = 1000
mail_plugins = quota
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave
namespace {
  inbox = yes
  list = yes
  location =
  prefix = INBOX/
  separator = /
  subscriptions = yes
  type = private
}
namespace {
  list = yes
  location = maildir:%%h/Maildir:INDEX=%h/Maildir/shared/%%u:CONTROL=%h/Maildir/shared/%%u
  prefix = shared/%%u/
  separator = /
  subscriptions = yes
  type = shared
}
passdb {
  args = /etc/dovecot/dovecot-ldap.conf.ext
  driver = ldap
}
plugin {
  acl = vfile
  acl_shared_dict = file:/srv/mail/shared-mailboxes
  quota = maildir:Quota
  quota_rule = *:storage=1G
  sieve = ~/.dovecot.sieve
  sieve_dir = ~/sieve
  sieve_max_redirects = 10
}
protocols = imap pop3 sieve lmtp
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
  unix_listener auth-userdb {
    group = vmail
    mode = 0770
    user = root
  }
}
service imap-login {
  process_min_avail = 4
  service_count = 0
}
service managesieve-login {
  inet_listener sieve {
    address = *
    port = 4190
  }
  inet_listener sieve_deprecated {
    address = *
    port = 2000
  }
  process_min_avail = 2
  service_count = 0
}
ssl_ca = </etc/ssl/certs/tfh_dfn_dtag_cacert.pem
ssl_cert = </etc/ssl/certs/imap.stud.tfh-bochum.de-20110530-cert-302177588.pem
ssl_key = </etc/ssl/private/imap.stud.tfh-bochum.de-20110530.key
userdb {
  args = /etc/dovecot/dovecot-ldap.conf.ext
  driver = ldap
}
protocol lmtp {
  mail_plugins = quota
}
protocol imap {
  mail_plugins = quota acl imap_acl imap_quota
}
protocol pop3 {
  mail_plugins = quota
}
________________________________
  Helge Wiethoff
 Medienzentrum
Telefon: +49 (234) 968 8717
Fax: +49 (234) 968 3453
E-Mail: Wiethoff at tfh-bochum.de

Technische Fachhochschule Georg Agricola
für Rohstoff, Energie und Umwelt zu Bochum
Staatlich anerkannte Fachhochschule der
DMT-Gesellschaft für Lehre und Bildung mbH
Herner Straße 45
44787 Bochum
http://www.tfh-bochum.de
________________________________
Träger: DMT-Gesellschaft für Lehre und Bildung mbH
Sitz der Gesellschaft: Bochum
Registergericht: Amtsgericht Bochum
Handelsregister: B 4052

Geschäftsführung:
Prof. Dr. Jürgen Kretschmann (Vorsitzender)
Manfred Freitag