1.\" Copyright (c) 2003 FreeBSD Project 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd January 26, 2003 28.Dt FTPCHROOT 5 29.Os 30.Sh NAME 31.Nm ftpchroot 32.Nd "list users and groups subject to FTP access restrictions" 33.Sh DESCRIPTION 34The file 35.Nm 36is read by 37.Xr ftpd 8 38at the beginning of an FTP session, after having authenticated the user. 39Each line in 40.Nm 41corresponds to a user or group. 42If a line in 43.Nm 44matches the current user or a group he is a member of, 45access restrictions will be applied to this 46session by changing its root directory with 47.Xr chroot 2 48to that specified on the line or to the user's login directory. 49.Pp 50The order of records in 51.Nm 52is important because the first match will be used. 53Fields on each line are separated by tabs or spaces. 54.Pp 55The first field specifies a user or group name. 56If it is prefixed by an 57.Dq at 58sign, 59.Ql @ , 60it specifies a group name; 61the line will match each user who is a member of this group. 62As a special case, a single 63.Ql @ 64in this field will match any user. 65A username is specified otherwise. 66.Pp 67The optional second field describes the directory for the user 68or each member of the group to be locked up in using 69.Xr chroot 2 . 70Be it omitted, the user's login directory will be used. 71If it is not an absolute pathname, then it will be relative 72to the user's login directory. 73If it contains the 74.Pa /./ 75separator, 76.Xr ftpd 8 77will treat its left-hand side as the name of the directory to do 78.Xr chroot 2 79to, and its right-hand side to change the current directory to afterwards. 80.Sh FILES 81.Bl -tag -width ".Pa /etc/ftpchroot" -compact 82.It Pa /etc/ftpchroot 83.El 84.Sh EXAMPLES 85These lines in 86.Nm 87will lock up the user 88.Dq Li webuser 89and each member of the group 90.Dq Li hostee 91in their respective login directories: 92.Bd -literal -offset indent 93webuser 94@hostee 95.Ed 96.Pp 97And this line will tell 98.Xr ftpd 8 99to lock up the user 100.Dq Li joe 101in 102.Pa /var/spool/ftp 103and then to change the current directory to 104.Pa /joe , 105which is relative to the session's new root: 106.Pp 107.Dl "joe /var/spool/ftp/./joe" 108.Pp 109And finally the following line will lock up every user connecting 110through FTP in his respective 111.Pa ~/public_html , 112thus lowering possible impact on the system 113from intrinsic insecurity of FTP: 114.Pp 115.Dl "@ public_html" 116.Sh SEE ALSO 117.Xr chroot 2 , 118.Xr group 5 , 119.Xr passwd 5 , 120.Xr ftpd 8 121