SMTP AUTH over SSL only?

[Matthew Seaman]

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Michael W. Lucas wrote:
> Hi folks,
> 
> I have a FreeBSD 7.0 server where I'd like to authenticate against
> /etc/master.passwd when using SMTP AUTH and Sendmail.  This means
> using LOGIN, which can use either plain text or SSL-tunneled
> connections.  I'd like to allow SMTP AUTH only over SSL, and disallow
> it over unencrypted connections.  Any suggestions on this?  Surely
> there's just some switch I'm missing?  The archives and search engines
> are full of people trying to get SSL working, not people trying to
> turn off non-SSL connections.
> 
> Here's the relevant snippets of sendmail.mc I'm using.
> 
> TRUST_AUTH_MECH(`GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN')dnl
> define(`confAUTH_MECHANISMS', `GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN')dnl
> define(`CERT_DIR', `/usr/local/etc/certs')dnl
> define(`confCACERT_PATH', `CERT_DIR')dnl
> define(`confCACERT', `CERT_DIR/hostname.pem')dnl
> define(`confSERVER_CERT', `CERT_DIR/hostname.pem')dnl
> define(`confSERVER_KEY', `CERT_DIR/hostname-key.pem')dnl
> define(`confCLIENT_CERT', `CERT_DIR/hostname.pem')dnl
> define(`confCLIENT_KEY', `CERT_DIR/hostname-key.pem')dnl
> DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl
> DAEMON_OPTIONS(`Port=smtps, Name=TLSMTA, M=s')dnl
> 
> Any suggestions greatly appreciated!

Add this to your /etc/mail/`hostname`.mc:

define(`confAUTH_OPTIONS', `p,y')dnl

See  /usr/share/doc/smm/08.sendmailop/paper.ascii.gz for details
- -- search for the section on AuthOptions..

	Cheers,

	Matthew
- -- 
Dr Matthew J Seaman MA, D.Phil.                   7 Priory Courtyard
                                                  Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey     Ramsgate
                                                  Kent, CT11 9PW
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