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-.TH s/qmail: qmail-popup 8
-.SH NAME
-qmail-popup \- read a POP username and password
-.SH SYNOPSIS
-.B qmail-popup
-.I hostname
-.I subprogram
-.SH DESCRIPTION
-.B qmail-popup
-reads a POP username and password from the network.
-It then runs
-.IR subprogram .
-
-.B 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.
-File descriptor 5 is used to provide additional logging.
-It invokes
-.IR 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
-.IR hostname ,
-and a final 0 byte.
-.B qmail-popup
-then waits for
-.I subprogram
-to finish.
-It prints an error message if
-.I subprogram
-crashes or exits nonzero.
-
-.B qmail-popup
-has a 20-minute idle timeout.
-
-.SH "AUTHENTICATION"
-.B qmail-popup
-supports both username/password and APOP authentication.
-This latter is invoked, once the 
-environment variable
-.I POP3AUTH='apop'
-or 
-.I POP3AUTH='+apop'
-is set. 
-In this case, you need to provide a
-APOP-capable PAM, eg. 
-.BR qmail-authuser .
-
-.B 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 connection
-and wreak havoc.
-
-.SH "STLS/POP3S SUPPORT"
-.B qmail-popup
-can be adviced to work on a TLS encrypted connection.
-
-At first, using
-.B sslserver
-and binding 
-.BR qmail-popup ,
-.B qmail-pop3d 
-on (in particular) the POP3S port
-.I 995 
-provides mandatory TLS encryption.
-
-Second, in case you provide
-the environment variable 
-.I UCSPITLS='' 
-together with
-.BR sslserver ,
-.B qmail-popup
-communicates with the
-.B sslserver
-program interface through a control socket, 
-a reading and a writing pipe created dynamically
-during the session start after announcing 
-.I STLS
-to the client, thus allowing TLS encryption on request.
-In case
-.IR UCSPITLS='!'
-is set, STLS is required; while setting
-.IR UCSPITLS='-'
-disables STLS.
-
-.SH "LOGGING"
-.B qmail-popup
-provides logging of accepted and rejected POP3 sessions
-using about the same format as
-.BR qmail-smtpd .
-The authentication mechanism is indicated via
-.I User 
-in case the userid/password method was used, and
-.I Apop
-if APOP challenge/response was applicable.
-The communication protocol may be either
-.I POP3
-or 
-.I POP3S
-for of a STLS/POP3S secured connection.
-The
-.I username
-provided for authentication is displayed after the 
-sequence 
-.IR '?~' .
-In case
-.B qmail-popup
-is setup requiring STLS by means of
-.IR UCSPITLS='!' ,
-the log displays 'Any' as auth method 
-and 'unknown' as username.
-
-
-The log is available on file descriptor 5. 
-In order to display the result use the redirection '5>&1'.
-
-.B qmail-popup
-is based on a program contributed by Russ Nelson.
-
-.SH "SEE ALSO"
-maildir(5),
-qmail-authuser(8),
-qmail-pop3d(8),
-qmail-log(8).
-