Re: [gentoo-security] postfix and SASL

[Joe Strusz]

Whenever i telnet to port 25, and issue the AUTH PLAIN command i receive this:

538: Encryption required for requested authentication mechanism.

What does this mean?

I could really use some help on this... its been bugging me for weeks now.

Also, I do have smtpd_tls_auth_only = yes line


Please help

blargh.

Your fellow befumbled gentoo user.



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>Date: Wed, 05 Oct 2005 12:36:01 +0100
>From: Jonathan Wright <mail@×××××××××.uk>
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>Subject: Re: [gentoo-security] postfix and SASL
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>Benjamin A'Lee wrote:
>>>Not sure but: why on port 25 and not on 465 ?
>>I don't think it actually matters which port; IIRC it just enables
>>STARTTLS by default on 465.
>
>Port 465 is for SSL (i.e. secure communication before any
>application data is transferred) and Port 25 accepts TLS (where the
>data is secured once both parties accept, however, application data
>transfer has occurred).
>
>Anyway, with telnet you can't talk on port 465 :)
>
> > I have confirmed postfix is indeed compiled with SASL support.  And i
> > have TLS working great.  However when i telnet to port 25 and issue the
> > ehlo command, i do receive the starttls etc... yet no AUTH PLAIN
> > lines...
>
>Depending on the configuration, AUTH PLAIN can either be disabled,
>or more likely, it's only send should STARTTLS be issued. I have the
>following lines in my main.cf:
>
>-- cut -----------------------------------------
># SMTPD SERVER CONTROLS
>smtpd_sasl_auth_enable = yes
>smtpd_sasl_security_options = noanonymous, noplaintext
>broken_sasl_auth_clients = yes
>smtpd_sasl_local_domain =
>smtpd_recipient_restrictions = permit_sasl_authenticated,
>permit_mynetworks, reject_unauth_destination
>
>smtpd_use_tls = yes
>smtpd_tls_auth_only = yes
>smtpd_tls_key_file = /etc/postfix/cacert/kenny.key
>smtpd_tls_cert_file = /etc/postfix/cacert/kenny.pem
>smtpd_tls_CAfile = /etc/postfix/cacert/cacert.pem
>smtpd_tls_loglevel = 1
>smtpd_tls_received_header = yes
>smtpd_tls_session_cache_timeout = 3600s
>tls_random_source = dev:/dev/urandom
>-- cut -----------------------------------------
>
>TLS is enabled, but smtpd_tls_auth_only will only permit
>authorization from clients who have issued (and successfully
>negotiated) the STARTTLS comment.
>
>Also, you can define what methods Postfix accepts by modifying the
>smtp_sasl_security_options directive.
>
>HTH,
>
>--
>  Jonathan Wright                           ~ mail at djnauk.co.uk
>                                            ~ www.djnauk.co.uk
>--
>  2.6.12-gentoo-r6-djnauk-b2 AMD Athlon(tm) XP 2100+
>  up 5 days,  3:02,  4 users,  load average: 0.72, 0.97, 0.71
>--
>  "I don't mind straight  people  as  long  as  they  act  gay  in
>  public."
>
>              ~ T-shirt worn by Dennis Rodman of the Chicago Bulls
>--
>gentoo-security@g.o mailing list


Joe Strusz

IT Assistant
Oxford Publishing, Inc.
307 West Jackson Avenue
Oxford, MS 38655-2154
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