qmail-popup - read a POP username and password
qmail-popup hostname subprogram
reads a POP username and password from the network. It then
is most commonly invoked from inetd
qmail-popup CHANGEME checkpassword qmail-pop3d Maildir
with CHANGEME replaced by the fully qualified domain name of the local host.
expects descriptor 0 to read from the network and descriptor
1 to write to the network. It reads a username and password from descriptor 0
in POP's USER-PASS style or APOP style. It invokes subprogram
, with the
same descriptors 0 and 1; descriptor 2 writing to the network; and descriptor
3 reading the username, a 0 byte, the password, another 0 byte, an APOP
timestamp derived from hostname
, and a final 0 byte. qmail-popup
then waits for subprogram
to finish. It prints an error message if
crashes or exits nonzero.
should be used only within a secure network. Otherwise an
eavesdropper can steal passwords. Even if you use APOP, an active attacker can
still take over the connection and wreak havoc.
has a 20-minute idle timeout.
is based on a program contributed by Russ Nelson.
maildir(5), qmail-local(8), qmail-pop3d(8)