Dairenn Lombard wrote:
My original question remains, however... Is that all there is to it?
What is doing the SMTP AUTH? QMail itself? Is it patched to query
MySQL? Is the existance of the e-mail address and a match password
in the vpopmail MySQL database *all* there is to SMTP AUTH working?
From the qmail-smtpd manpage:
qmail-smtpd supports ESMTP, including the 8BITMIME, DATA,
PIPELINING, SIZE, and AUTH options. qmail-smtpd includes a "MAIL
FROM:" parameter parser and obeys "Auth" and "Size" advertisements.
qmail-smtpd can accept LOGIN, PLAIN, and CRAM-MD5 AUTH types. It
invokes checkprogram, which reads on file descriptor 3 the
username, a 0 byte, the password or CRAM-MD5 digest/response derived
from the SMTP client, another 0 byte, a CRAM-MD5 challenge (if
applicable to the AUTH type), and a final 0 byte. checkprogram invokes
subprogram upon successful authentication, which should in turn return 0
to qmail-smtpd, effectively setting the environment variables
$RELAYCLIENT and $TCPREMOTEINFO (any supplied value replaced with the
authenticated username). qmail-smtpd will reject the authentication
attempt if it receives a nonzero return value from checkprogram or
subprogram.
The /var/qmail/supervise/smtp/run says:
exec /usr/bin/softlimit -m 12000000 \
/usr/bin/tcpserver -v -R -H -l $HOSTNAME -x $TCP_CDB -c "$MAXSMTPD" \
-u "$QMAILDUID" -g "$NOFILESGID" 0 smtp \
$RBLSMTPD $BLACKLIST $SMTPD $VCHKPW /bin/true 2>&1
That's it: SMTP auth is handled through VCHKPW="/home/vpopmail/bin/vchkpw",
that is part of vpopmail package. It uses libvpopmail to handle requests to
users database.
--
Best regards,
Alexey Loukianov mailto:[EMAIL PROTECTED]
System Engineer,
IT Department,
Lavtech Corp.
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