[Dovecot] [BUG?] LDAP authentication with aliases issues

31 Jul 2011

      Hello,
I am trying to configure Dovecot with LDAP authentication. My LDAP tree
structure is as following:
dc=root,dc=pl
\_ ou=Users
\_ uid=test
\_ ou=Mail
\_ ou=domain.pl
\_ uid=alias_to_test
I cannot authenticate using
'uid=alias_to_test,ou=domain.pl,ou=Mail,dc=root,dc=pl'. If I try to
authenticate using
'uid=alias_to_test,ou=domain.pl,ou=Mail,dc=root,dc=pl', following entry
appears in the Dovecot's log file:
#v+
auth: Debug: client in: AUTH    1       PLAIN   service=imap    secured
lip=127.0.0.1   rip=127.0.0.1   lport=993       rport=59818

resp=YWxpYXMxQGFsaWFzeS5wbABhbGlhczFAYWxpYXN5LnBsAGFzZHF3ZWFzZA==
auth: Debug: ldap(alias_to_test@domain.pl,127.0.0.1): pass search:
base=uid=alias_to_test,ou=domain.pl,ou=Mail,dc=root,dc=pl scope=base
filter=(&(objectClass=posixAccount)) fields=uid,userPassword
auth: Debug: auth(alias_to_test@domain.pl,127.0.0.1): username changed
alias_to_test@domain.pl -> test
auth: Debug: ldap(test,127.0.0.1): result: uid(user)=test
userPassword(password)={CRYPT}ACnZvF4.K46UI
auth: Debug: client out: OK     1       user=test
auth: Debug: ldap(test,127.0.0.1): user search:
base=uid=test,ou=,ou=Mail,dc=root,dc=pl scope=base
filter=(&(objectClass=posixAccount)(uid=test))
fields=homeDirectory,uidNumber,gidNumber
auth: Debug: master out: FAIL   2551840769
#v-
In the LDAP server log file, following entries appear during
authentication attempt
#v+
ldap slapd[11729]: conn=1125 op=0 BIND dn="cn=Manager,dc=root,dc=pl"
method=128
ldap slapd[11729]: conn=1125 op=0 BIND dn="cn=Manager,dc=root,dc=pl"
mech=SIMPLE ssf=0
ldap slapd[11729]: conn=1125 op=0 RESULT tag=97 err=0 text=
ldap slapd[11729]: conn=1125 op=1 SRCH
base="uid=alias_to_test,ou=domain.pl,ou=Mail,dc=root,dc=pl" scope=0
deref=3 filter="(&(objectClass=posixAccount))"
ldap slapd[11729]: conn=1125 op=1 SRCH attr=uid userPassword
ldap slapd[11729]: conn=1125 op=1 SEARCH RESULT tag=101 err=0 nentries=1
text=
ldap slapd[11729]: conn=1125 op=2 do_search: invalid dn:
"uid=test,ou=,ou=Mail,dc=root,dc=pl"
ldap slapd[11729]: conn=1125 op=2 SEARCH RESULT tag=101 err=34
nentries=0 text=invalid DN
#v-
It seems that LDAP AuthDatabase doesn't change the context when looking
up for the target object, to which the alias points. Futhermore, the
filter for the target object '(&(objectClass=posixAccount)(uid=test))'
was not defined by me anywhere in the configuration file 'dovecot-ldap.ext'.
I have tried both authentication ways: 'password lookups' and
'authentication binding' with the same result. However, There is no
problem to authenticate as 'uid=test,ou=Users,dc=root,dc=pl' (of cource
after modifying the configuration file listed at the end).
I suppose that it can be a bug in LDAP AuthDatabase, so I am writing
this post as a potential bug report.
Below are my configuration data:

# dovecot -n
# 2.0.13: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.38.8-1 x86_64
auth_debug = yes
auth_debug_passwords = yes
auth_mechanisms = plain login
auth_socket_path = /var/run/dovecot/auth-userdb
auth_verbose = yes
auth_verbose_passwords = plain
listen = *
mail_debug = yes
mail_gid = 2000
mail_uid = 2000
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
passdb {
args = /etc/dovecot/dovecot-ldap.conf.ext
driver = ldap
}
plugin {
sieve = ~/.dovecot.sieve
sieve_dir = ~/sieve
}
postmaster_address = postmaster@domain.pl
protocols = imap pop3 sieve
service auth {
unix_listener /var/spool/postfix/private/auth {
mode = 0666
}
unix_listener auth-userdb {
group = vmail
mode = 0600
user = vmail
}
}
service imap-login {
inet_listener imap {
port = 143
}
inet_listener imaps {
port = 993
ssl = yes
}
}
service pop3-login {
inet_listener pop3 {
port = 110
}
inet_listener pop3s {
port = 995
ssl = yes
}
}
ssl = required
ssl_cert = </etc/openssl/certs/vmail.pem
ssl_key = </etc/openssl/private/vmail.key
userdb {
args = /etc/dovecot/dovecot-ldap.conf.ext
driver = ldap
}
verbose_ssl = yes

# cat /etc/dovecot/dovecot-ldap.ext
uris = ldap://X.Y.Z.V/
dn = cn=Manager,dc=root,dc=pl
dnpass = password
auth_bind = no
ldap_version = 3
base = uid=%n,ou=%d,ou=Mail,dc=root,dc=pl
deref = always
scope = base
pass_attrs = uid=user,userPassword=password
pass_filter = (&(objectClass=posixAccount))
default_pass_scheme = CRYPT

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