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From: Julien Vehent on 19 May 2010 08:00
Hey guys,

I want to set up SASL authentication using LDAPDB, but it seems that
postfix connects to LDAP but doesn't send anything to it...

I try to authenticate using 'auth plain <base64>', and I receive :

535 5.7.8 Error: authentication failed: authentication failure

Connection to LDAP works fine at the network level, but the only thing
that postfix send to Slapd (sniffed using tcpdump) is a "UNBIND" request.
Confirmed by the logs of slapd:

----
May 18 17:25:29 samchiel slapd[1431]: conn=35 fd=17 ACCEPT from
IP=127.0.0.1:57368 (IP=127.0.0.1:389)
May 18 17:25:29 samchiel slapd[1431]: conn=35 op=0 UNBIND
May 18 17:25:29 samchiel slapd[1431]: conn=35 fd=17 closed
----

Postfix says the following:

----
May 18 17:25:29 samchiel postfix/smtpd[12094]: < localhost[127.0.0.1]:
auth plain XXXXXXXXXXXXXXXXXXXXX
May 18 17:25:29 samchiel postfix/smtpd[12094]: xsasl_cyrus_server_first:
sasl_method plain, init_response XXXXXXXXXXXXXXXXXXXXX
May 18 17:25:29 samchiel postfix/smtpd[12094]: xsasl_cyrus_server_first:
decoded initial response
May 18 17:25:29 samchiel postfix/smtpd[12094]: warning: SASL
authentication failure: Password verification failed
May 18 17:25:29 samchiel postfix/smtpd[12094]: warning:
localhost[127.0.0.1]: SASL plain authentication failed: authentication
failure
May 18 17:25:29 samchiel postfix/smtpd[12094]: > localhost[127.0.0.1]: 535
5.7.8 Error: authentication failed: authentication failure
----

So, I assumed there might be something wrong with my configuration. Since
I'm on Debian Squeeze (for testing purpose), I have a
/etc/postfix/sasl/smtpd.conf that contains the configuration of ldapdb:

----
# cat /etc/postfix/sasl/smtpd.conf
pwcheck_method: auxprop
auxprop_plugin: ldapdb
mech_list: PLAIN LOGIN
ldapdb_uri: ldap://localhost
ldapdb_id: postfix
ldapdb_pw: ZZZZzzzzZZZZZZZ
ldapdb_mech: DIGEST-MD5 PLAIN LOGIN
----

and sasl directives in main.conf

----
# grep smtpd_sasl main.cf
smtpd_sasl_type = cyrus
smtpd_sasl_auth_enable = yes
smtpd_sasl_path = smtpd
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $mydomain
smtpd_sasl_authenticated_header = yes
----


Did I miss anything ? Any clue on why postfix doesn't send anything but an
UNBIND request to LDAP ?



Thanks,
Julien


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