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.Dd January 26, 2003 26.Dt FTPCHROOT 5 27.Os 28.Sh NAME 29.Nm ftpchroot 30.Nd "list users and groups subject to FTP access restrictions" 31.Sh DESCRIPTION 32The file 33.Nm 34is read by 35.Xr ftpd 8 36at the beginning of an FTP session, after having authenticated the user. 37Each line in 38.Nm 39corresponds to a user or group. 40If a line in 41.Nm 42matches the current user or a group he is a member of, 43access restrictions will be applied to this 44session by changing its root directory with 45.Xr chroot 2 46to that specified on the line or to the user's login directory. 47.Pp 48The order of records in 49.Nm 50is important because the first match will be used. 51Fields on each line are separated by tabs or spaces. 52.Pp 53The first field specifies a user or group name. 54If it is prefixed by an 55.Dq at 56sign, 57.Ql @ , 58it specifies a group name; 59the line will match each user who is a member of this group. 60As a special case, a single 61.Ql @ 62in this field will match any user. 63A username is specified otherwise. 64.Pp 65The optional second field describes the directory for the user 66or each member of the group to be locked up in using 67.Xr chroot 2 . 68Be it omitted, the user's login directory will be used. 69If it is not an absolute pathname, then it will be relative 70to the user's login directory. 71If it contains the 72.Pa /./ 73separator, 74.Xr ftpd 8 75will treat its left-hand side as the name of the directory to do 76.Xr chroot 2 77to, and its right-hand side to change the current directory to afterwards. 78.Sh FILES 79.Bl -tag -width ".Pa /etc/ftpchroot" -compact 80.It Pa /etc/ftpchroot 81.El 82.Sh EXAMPLES 83These lines in 84.Nm 85will lock up the user 86.Dq Li webuser 87and each member of the group 88.Dq Li hostee 89in their respective login directories: 90.Bd -literal -offset indent 91webuser 92@hostee 93.Ed 94.Pp 95And this line will tell 96.Xr ftpd 8 97to lock up the user 98.Dq Li joe 99in 100.Pa /var/spool/ftp 101and then to change the current directory to 102.Pa /joe , 103which is relative to the session's new root: 104.Pp 105.Dl "joe /var/spool/ftp/./joe" 106.Pp 107And finally the following line will lock up every user connecting 108through FTP in his respective 109.Pa ~/public_html , 110thus lowering possible impact on the system 111from intrinsic insecurity of FTP: 112.Pp 113.Dl "@ public_html" 114.Sh SEE ALSO 115.Xr chroot 2 , 116.Xr group 5 , 117.Xr passwd 5 , 118.Xr ftpd 8 119