QMAIL-POPUP(8) - Linux man page online | Administration and privileged commands

Read a POP username and password.

qmail-popup(8) System Manager's Manual qmail-popup(8)


qmail-popup - read a POP username and password


qmail-popup hostname subprogram


qmail-popup reads a POP username and password from the network. It then runs subprogram. qmail-popup is most commonly invoked from inetd as qmail-popup CHANGEME checkpassword qmail-pop3d Maildir with CHANGEME replaced by the fully qualified domain name of the local host. qmail-popup 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 writ‐ ing 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 subprogram crashes or exits nonzero. qmail-popup 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 connec‐ tion and wreak havoc. qmail-popup has a 20-minute idle timeout. qmail-popup is based on a program contributed by Russ Nelson.


maildir(5), qmail-local(8), qmail-pop3d(8)
This manual Reference Other manuals
qmail-popup(8) referred by checkapoppw(8) | checkpw(8) | qmail-pop3d(8)
refer to maildir(5) | qmail-local(8) | qmail-pop3d(8)
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