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119 lines
3.5 KiB
Groff
119 lines
3.5 KiB
Groff
.\" Copyright (c) 2003 FreeBSD Project
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd January 26, 2003
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.Dt FTPCHROOT 5
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.Os
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.Sh NAME
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.Nm ftpchroot
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.Nd "list users and groups subject to FTP access restrictions"
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.Sh DESCRIPTION
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The file
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.Nm
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is read by
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.Xr ftpd 8
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at the beginning of an FTP session, after having authenticated the user.
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Each line in
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.Nm
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corresponds to a user or group.
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If a line in
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.Nm
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matches the current user or a group he is a member of,
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access restrictions will be applied to this
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session by changing its root directory with
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.Xr chroot 2
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to that specified on the line or to the user's login directory.
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.Pp
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The order of records in
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.Nm
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is important because the first match will be used.
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Fields on each line are separated by tabs or spaces.
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.Pp
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The first field specifies a user or group name.
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If it is prefixed by an
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.Dq at
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sign,
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.Ql @ ,
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it specifies a group name;
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the line will match each user who is a member of this group.
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As a special case, a single
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.Ql @
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in this field will match any user.
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A username is specified otherwise.
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.Pp
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The optional second field describes the directory for the user
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or each member of the group to be locked up in using
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.Xr chroot 2 .
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Be it omitted, the user's login directory will be used.
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If it is not an absolute pathname, then it will be relative
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to the user's login directory.
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If it contains the
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.Pa /./
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separator,
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.Xr ftpd 8
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will treat its left-hand side as the name of the directory to do
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.Xr chroot 2
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to, and its right-hand side to change the current directory to afterwards.
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.Sh FILES
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.Bl -tag -width ".Pa /etc/ftpchroot" -compact
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.It Pa /etc/ftpchroot
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.El
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.Sh EXAMPLES
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These lines in
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.Nm
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will lock up the user
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.Dq Li webuser
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and each member of the group
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.Dq Li hostee
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in their respective login directories:
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.Bd -literal -offset indent
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webuser
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@hostee
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.Ed
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.Pp
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And this line will tell
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.Xr ftpd 8
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to lock up the user
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.Dq Li joe
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in
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.Pa /var/spool/ftp
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and then to change the current directory to
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.Pa /joe ,
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which is relative to the session's new root:
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.Pp
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.Dl "joe /var/spool/ftp/./joe"
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.Pp
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And finally the following line will lock up every user connecting
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through FTP in his respective
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.Pa ~/public_html ,
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thus lowering possible impact on the system
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from intrinsic insecurity of FTP:
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.Pp
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.Dl "@ public_html"
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.Sh SEE ALSO
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.Xr chroot 2 ,
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.Xr group 5 ,
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.Xr passwd 5 ,
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.Xr ftpd 8
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