# $Id: openbsd-ftpd_block_ie.diff,v 1.1 2008/12/17 03:42:45 jcs Exp $
#
# refuse ftpd connections from internet explorer users to prevent it
# from creating tons of duplicate connections/transfers.
#
# jcs@jcs.org
#

Index: ftpd.c
===================================================================
RCS file: /mirror/anoncvs/cvs/src/libexec/ftpd/ftpd.c,v
retrieving revision 1.175
diff -u -r1.175 ftpd.c
--- ftpd.c	1 Mar 2007 20:06:27 -0000	1.175
+++ ftpd.c	13 Dec 2008 19:25:11 -0000
@@ -946,6 +946,17 @@
 			fatal("Out of memory.");
 		}
 
+		if (strcmp(passwd, "IEUser@") == 0) {
+			/* fucking ie users */
+			syslog(LOG_INFO|LOG_AUTH,
+			    "ANONYMOUS FTP LOGIN REFUSED FROM %s: IE user",
+			    remotehost);
+			reply(530, "FTP access from Internet Explorer "
+			"denied; use a real FTP client.");
+			kill_slave("approval failure");
+			_exit(0);
+		}
+
 		authok = auth_approval(as, lc, pw->pw_name, "ftp");
 		auth_close(as);
 		as = NULL;