739 lines
15 KiB
Groff
739 lines
15 KiB
Groff
.\" $NetBSD: ftpd.conf.5,v 1.37 2009/04/09 02:25:45 joerg Exp $
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.\"
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.\" Copyright (c) 1997-2008 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Luke Mewburn.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd April 13, 2007
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.Dt FTPD.CONF 5
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.Os
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.Sh NAME
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.Nm ftpd.conf
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.Nd
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.Xr ftpd 8
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configuration file
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.Sh DESCRIPTION
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|
The
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.Nm
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file specifies various configuration options for
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.Xr ftpd 8
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|
that apply once a user has authenticated their connection.
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.Pp
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.Nm
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|
consists of a series of lines, each of which may contain a
|
|
configuration directive, a comment, or a blank line.
|
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Directives that appear later in the file override settings by previous
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directives.
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This allows
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.Sq wildcard
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entries to define defaults, and then have class-specific overrides.
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.Pp
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|
A directive line has the format:
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.Dl command class [arguments]
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.Pp
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|
A
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|
.Dq \e
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|
is the escape character; it can be used to escape the meaning of the
|
|
comment character, or if it is the last character on a line, extends
|
|
a configuration directive across multiple lines.
|
|
A
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|
.Dq #
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|
is the comment character, and all characters from it to the end of
|
|
line are ignored (unless it is escaped with the escape character).
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.Pp
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|
Each authenticated user is a member of a
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.Em class ,
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|
which is determined by
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.Xr ftpusers 5 .
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.Em class
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|
is used to determine which
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.Nm
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|
entries apply to the user.
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The following special classes exist when parsing entries in
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.Nm :
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.Bl -tag -width "chroot" -compact -offset indent
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.It Sy all
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|
Matches any class.
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.It Sy none
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|
Matches no class.
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.El
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.Pp
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|
Each class has a type, which may be one of:
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|
.Bl -tag -width "CHROOT" -offset indent
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|
.It Sy GUEST
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|
Guests (as per the
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.Dq anonymous
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|
and
|
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.Dq ftp
|
|
logins).
|
|
A
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|
.Xr chroot 2
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|
is performed after login.
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|
.It Sy CHROOT
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|
.Xr chroot 2 Ns ed
|
|
users (as per
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|
.Xr ftpchroot 5 ) .
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|
A
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|
.Xr chroot 2
|
|
is performed after login.
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.It Sy REAL
|
|
Normal users.
|
|
.El
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|
.Pp
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|
The
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|
.Xr ftpd 8
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|
.Sy STAT
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|
command will return the class settings for the current user as defined by
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.Nm ,
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|
unless the
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|
.Sy private
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|
directive is set for the class.
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|
.Pp
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|
Each configuration line may be one of:
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|
.Bl -tag -width 4n
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|
.It Sy advertize Ar class Op Ar host
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|
Set the address to advertise in the response to the
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|
.Sy PASV
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|
and
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|
.Sy LPSV
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|
commands to the address for
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|
.Ar host
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|
(which may be either a host name or IP address).
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|
This may be useful in some firewall configurations, although many
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ftp clients may not work if the address being advertised is different
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to the address that they've connected to.
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|
If
|
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.Ar class
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|
is
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.Dq none
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or
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.Ar host
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not is specified, disable this.
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.It Sy checkportcmd Ar class Op Sy off
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|
Check the
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.Sy PORT
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command for validity.
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|
The
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.Sy PORT
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|
command will fail if the IP address specified does not match the
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.Tn FTP
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command connection, or if the remote TCP port number is less than
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.Dv IPPORT_RESERVED .
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|
It is
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|
.Em strongly
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|
encouraged that this option be used, especially for sites concerned
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|
with potential security problems with
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.Tn FTP
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|
bounce attacks.
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|
If
|
|
.Ar class
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|
is
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|
.Dq none
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or
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.Sy off
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|
is specified, disable this feature, otherwise enable it.
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|
.It Sy chroot Ar class Op Sy pathformat
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|
If
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.Ar pathformat
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|
is not specified or
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.Ar class
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|
is
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|
.Dq none ,
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|
use the default behavior (see below).
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|
Otherwise,
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|
.Ar pathformat
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|
is parsed to create a directory to create as the root directory with
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.Xr chroot 2
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into upon login.
|
|
.Pp
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|
.Ar pathformat
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|
can contain the following escape strings:
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|
.Bl -tag -width "Escape" -offset indent -compact
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|
.It Sy "Escape"
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|
.Sy Description
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|
.It "\&%c"
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Class name.
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|
.It "\&%d"
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Home directory of user.
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.It "\&%u"
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User name.
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|
.It "\&%\&%"
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|
A
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.Dq \&%
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|
character.
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.El
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|
.Pp
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|
The default root directory is:
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|
.Bl -tag -width "CHROOT" -offset indent -compact
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.It Sy CHROOT
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|
The user's home directory.
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.It Sy GUEST
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|
If
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|
.Fl a Ar anondir
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|
is specified, use
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|
.Ar anondir ,
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|
otherwise the home directory of the
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.Sq ftp
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user.
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|
.It Sy REAL
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|
By default no
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.Xr chroot 2
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|
is performed.
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.El
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|
.It Sy classtype Ar class Ar type
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|
Set the class type of
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.Ar class
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to
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.Ar type
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|
(see above).
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|
.It Sy conversion Ar class Ar suffix Op Ar "type disable command"
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|
Define an automatic in-line file conversion.
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|
If a file to retrieve ends in
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.Ar suffix ,
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|
and a real file (sans
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.Ar suffix )
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|
exists, then the output of
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.Ar command
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|
is returned instead of the contents of the file.
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.Pp
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|
.Bl -tag -width "disable" -offset indent
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|
.It Ar suffix
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|
The suffix to initiate the conversion.
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|
.It Ar type
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|
A list of valid file types for the conversion.
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|
Valid types are:
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.Sq f
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|
(file), and
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.Sq d
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|
(directory).
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|
.It Ar disable
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|
The name of file that will prevent conversion if it exists.
|
|
A file name of
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|
.Dq Pa \&.
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|
will prevent this disabling action
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|
(i.e., the conversion is always permitted.)
|
|
.It Ar command
|
|
The command to run for the conversion.
|
|
The first word should be the full path name
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|
of the command, as
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|
.Xr execv 3
|
|
is used to execute the command.
|
|
All instances of the word
|
|
.Dq %s
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|
in
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|
.Ar command
|
|
are replaced with the requested file (sans
|
|
.Ar suffix ) .
|
|
.El
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|
.Pp
|
|
Conversion directives specified later in the file override earlier
|
|
conversions with the same suffix.
|
|
.It Sy denyquick Ar class Op Sy off
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|
Enforce
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|
.Xr ftpusers 5
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|
rules after the
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.Sy USER
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|
command is received, rather than after the
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|
.Sy PASS
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|
command is received.
|
|
Whilst enabling this feature may allow information leakage about
|
|
available accounts (for example, if you allow some users of a
|
|
.Sy REAL
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|
or
|
|
.Sy CHROOT
|
|
class but not others), it is useful in preventing a denied user
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|
(such as
|
|
.Sq root )
|
|
from entering their password across an insecure connection.
|
|
This option is
|
|
.Em strongly
|
|
recommended for servers which run an anonymous-only service.
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Sy off
|
|
is specified, disable this feature, otherwise enable it.
|
|
.It Sy display Ar class Op Ar file
|
|
If
|
|
.Ar file
|
|
is not specified or
|
|
.Ar class
|
|
is
|
|
.Dq none ,
|
|
disable this.
|
|
Otherwise, each time the user enters a new directory, check if
|
|
.Ar file
|
|
exists, and if so, display its contents to the user.
|
|
Escape sequences are supported; refer to
|
|
.Sx Display file escape sequences
|
|
in
|
|
.Xr ftpd 8
|
|
for more information.
|
|
.It Sy hidesymlinks Ar class Op Sy off
|
|
If
|
|
.Ar class
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|
is
|
|
.Dq none
|
|
or
|
|
.Sy off
|
|
is specified, disable this feature.
|
|
Otherwise, the
|
|
.Sy LIST
|
|
command lists symbolic links as the file or directory the link
|
|
references
|
|
.Pq Dq Li "ls -LlA" .
|
|
Servers which run an anonymous service may wish to enable this
|
|
feature for
|
|
.Sy GUEST
|
|
users, so that symbolic links do not leak names in
|
|
directories that are not searchable by
|
|
.Sy GUEST
|
|
users.
|
|
.It Sy homedir Ar class Op Sy pathformat
|
|
If
|
|
.Ar pathformat
|
|
is not specified or
|
|
.Ar class
|
|
is
|
|
.Dq none ,
|
|
use the default behavior (see below).
|
|
Otherwise,
|
|
.Ar pathformat
|
|
is parsed to create a directory to change into upon login, and to use
|
|
as the
|
|
.Sq home
|
|
directory of the user for tilde expansion in pathnames, etc.
|
|
.Ar pathformat
|
|
is parsed as per the
|
|
.Sy chroot
|
|
directive.
|
|
.Pp
|
|
The default home directory is the home directory of the user for
|
|
.Sy REAL
|
|
users, and
|
|
.Pa /
|
|
for
|
|
.Sy GUEST
|
|
and
|
|
.Sy CHROOT
|
|
users.
|
|
.It Sy limit Ar class Op Ar count Op Ar file
|
|
Limit the maximum number of concurrent connections for
|
|
.Ar class
|
|
to
|
|
.Ar count ,
|
|
with
|
|
.Sq \-1
|
|
meaning unlimited connections.
|
|
If the limit is exceeded and
|
|
.Ar file
|
|
is specified, display its contents to the user.
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Ar count
|
|
is not specified, disable this.
|
|
If
|
|
.Ar file
|
|
is a relative path, it will be searched for in
|
|
.Pa /etc
|
|
(which can be overridden with
|
|
.Fl c Ar confdir ) .
|
|
.It Sy maxfilesize Ar class Op Ar size
|
|
Set the maximum size of an uploaded file to
|
|
.Ar size ,
|
|
with
|
|
.Sq \-1
|
|
meaning unlimited connections.
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Ar size
|
|
is not specified, disable this.
|
|
.It Sy maxtimeout Ar class Op Ar time
|
|
Set the maximum timeout period that a client may request,
|
|
defaulting to two hours.
|
|
This cannot be less than 30 seconds, or the value for
|
|
.Sy timeout .
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Ar time
|
|
is not specified, use the default.
|
|
.It Sy mmapsize Ar class Op Ar size
|
|
Set the size of the sliding window to map a file using
|
|
.Xr mmap 2 .
|
|
If zero,
|
|
.Xr ftpd 8
|
|
will use
|
|
.Xr read 2
|
|
instead.
|
|
The default is zero.
|
|
This option affects only binary transfers.
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Ar size
|
|
is not specified, use the default.
|
|
.It Sy modify Ar class Op Sy off
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Sy off
|
|
is specified, disable the following commands:
|
|
.Sy CHMOD ,
|
|
.Sy DELE ,
|
|
.Sy MKD ,
|
|
.Sy RMD ,
|
|
.Sy RNFR ,
|
|
and
|
|
.Sy UMASK .
|
|
Otherwise, enable them.
|
|
.It Sy motd Ar class Op Ar file
|
|
If
|
|
.Ar file
|
|
is not specified or
|
|
.Ar class
|
|
is
|
|
.Dq none ,
|
|
disable this.
|
|
Otherwise, use
|
|
.Ar file
|
|
as the message of the day file to display after login.
|
|
Escape sequences are supported; refer to
|
|
.Sx Display file escape sequences
|
|
in
|
|
.Xr ftpd 8
|
|
for more information.
|
|
If
|
|
.Ar file
|
|
is a relative path, it will be searched for in
|
|
.Pa /etc
|
|
(which can be overridden with
|
|
.Fl c Ar confdir ) .
|
|
.It Sy notify Ar class Op Ar fileglob
|
|
If
|
|
.Ar fileglob
|
|
is not specified or
|
|
.Ar class
|
|
is
|
|
.Dq none ,
|
|
disable this.
|
|
Otherwise, each time the user enters a new directory,
|
|
notify the user of any files matching
|
|
.Ar fileglob .
|
|
.It Sy passive Ar class Op Sy off
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Sy off
|
|
is specified, prevent passive
|
|
.Sy ( PASV ,
|
|
.Sy LPSV ,
|
|
and
|
|
.Sy EPSV )
|
|
connections.
|
|
Otherwise, enable them.
|
|
.It Sy portrange Ar class Op Ar min Ar max
|
|
Set the range of port number which will be used for the passive data port.
|
|
.Ar max
|
|
must be greater than
|
|
.Ar min ,
|
|
and both numbers must be be between
|
|
.Dv IPPORT_RESERVED
|
|
(1024) and 65535.
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or no arguments are specified, disable this.
|
|
.It Sy private Ar class Op Sy off
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Sy off
|
|
is specified, do not display class information in the output of the
|
|
.Sy STAT
|
|
command.
|
|
Otherwise, display the information.
|
|
.It Sy rateget Ar class Op Ar rate
|
|
Set the maximum get
|
|
.Pq Sy RETR
|
|
transfer rate throttle for
|
|
.Ar class
|
|
to
|
|
.Ar rate
|
|
bytes per second.
|
|
If
|
|
.Ar rate
|
|
is 0, the throttle is disabled.
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Ar rate
|
|
is not specified, disable this.
|
|
.It Sy rateput Ar class Op Ar rate
|
|
Set the maximum put
|
|
.Pq Sy STOR
|
|
transfer rate throttle for
|
|
.Ar class
|
|
to
|
|
.Ar rate
|
|
bytes per second.
|
|
If
|
|
.Ar rate
|
|
is 0, the throttle is disabled.
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Ar rate
|
|
is not specified, disable this.
|
|
.It Sy readsize Ar class Op Ar size
|
|
Set the size of the read buffer to
|
|
.Xr read 2
|
|
a file.
|
|
The default is the file system block size.
|
|
This option affects only binary transfers.
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Ar size
|
|
is not specified, use the default.
|
|
.It Sy recvbufsize Ar class Op Ar size
|
|
Set the size of the socket receive buffer.
|
|
The default is zero and the system default value will be used.
|
|
This option affects only passive transfers.
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Ar size
|
|
is not specified, use the default.
|
|
.It Sy sanenames Ar class Op Sy off
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Sy off
|
|
is specified, allow uploaded file names to contain any characters valid for a
|
|
file name.
|
|
Otherwise, only permit file names which don't start with a
|
|
.Sq \&.
|
|
and only comprise of characters from the set
|
|
.Dq [-+,._A-Za-z0-9] .
|
|
.It Sy sendbufsize Ar class Op Ar size
|
|
Set the size of the socket send buffer.
|
|
The default is zero and the system default value will be used.
|
|
This option affects only binary transfers.
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Ar size
|
|
is not specified, use the default.
|
|
.It Sy sendlowat Ar class Op Ar size
|
|
Set the low water mark of socket send buffer.
|
|
The default is zero and system default value will be used.
|
|
This option affects only for binary transfer.
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Ar size
|
|
is not specified, use the default.
|
|
.It Sy template Ar class Op Ar refclass
|
|
Define
|
|
.Ar refclass
|
|
as the
|
|
.Sq template
|
|
for
|
|
.Ar class ;
|
|
any reference to
|
|
.Ar refclass
|
|
in following directives will also apply to members of
|
|
.Ar class .
|
|
This is useful to define a template class so that other classes which are
|
|
to share common attributes can be easily defined without unnecessary
|
|
duplication.
|
|
There can be only one template defined at a time.
|
|
If
|
|
.Ar refclass
|
|
is not specified, disable the template for
|
|
.Ar class .
|
|
.It Sy timeout Ar class Op Ar time
|
|
Set the inactivity timeout period.
|
|
(the default is fifteen minutes).
|
|
This cannot be less than 30 seconds, or greater than the value for
|
|
.Sy maxtimeout .
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Ar time
|
|
is not specified, use the default.
|
|
.It Sy umask Ar class Op Ar umaskval
|
|
Set the umask to
|
|
.Ar umaskval .
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Ar umaskval
|
|
is not specified, set to the default of
|
|
.Li 027 .
|
|
.It Sy upload Ar class Op Sy off
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Sy off
|
|
is specified, disable the following commands:
|
|
.Sy APPE ,
|
|
.Sy STOR ,
|
|
and
|
|
.Sy STOU ,
|
|
as well as the modify commands:
|
|
.Sy CHMOD ,
|
|
.Sy DELE ,
|
|
.Sy MKD ,
|
|
.Sy RMD ,
|
|
.Sy RNFR ,
|
|
and
|
|
.Sy UMASK .
|
|
Otherwise, enable them.
|
|
.It Sy writesize Ar class Op Ar size
|
|
Limit the number of bytes to
|
|
.Xr write 2
|
|
at a time.
|
|
The default is zero, which means all the data available as a result of
|
|
.Xr mmap 2
|
|
or
|
|
.Xr read 2
|
|
will be written at a time.
|
|
This option affects only binary transfers.
|
|
If
|
|
.Ar class
|
|
is
|
|
.Dq none
|
|
or
|
|
.Ar size
|
|
is not specified, use the default.
|
|
.El
|
|
.Ss Numeric argument suffix parsing
|
|
Where command arguments are numeric, a decimal number is expected.
|
|
Two or more numbers may be separated by an
|
|
.Dq x
|
|
to indicate a product.
|
|
Each number may have one of the following optional suffixes:
|
|
.Bl -tag -width 3n -offset indent -compact
|
|
.It b
|
|
Block; multiply by 512
|
|
.It k
|
|
Kibi; multiply by 1024 (1 KiB)
|
|
.It m
|
|
Mebi; multiply by 1048576 (1 MiB)
|
|
.It g
|
|
Gibi; multiply by 1073741824 (1 GiB)
|
|
.It t
|
|
Tebi; multiply by 1099511627776 (1 TiB)
|
|
.It w
|
|
Word; multiply by the number of bytes in an integer
|
|
.El
|
|
.Pp
|
|
See
|
|
.Xr strsuftoll 3
|
|
for more information.
|
|
.Sh DEFAULTS
|
|
The following defaults are used:
|
|
.Pp
|
|
.Bd -literal -offset indent -compact
|
|
checkportcmd all
|
|
classtype chroot CHROOT
|
|
classtype guest GUEST
|
|
classtype real REAL
|
|
display none
|
|
limit all \-1 # unlimited connections
|
|
maxtimeout all 7200 # 2 hours
|
|
modify all
|
|
motd all motd
|
|
notify none
|
|
passive all
|
|
timeout all 900 # 15 minutes
|
|
umask all 027
|
|
upload all
|
|
modify guest off
|
|
umask guest 0707
|
|
.Ed
|
|
.Sh FILES
|
|
.Bl -tag -width /usr/share/examples/ftpd/ftpd.conf -compact
|
|
.It Pa /etc/ftpd.conf
|
|
This file.
|
|
.It Pa /usr/share/examples/ftpd/ftpd.conf
|
|
A sample
|
|
.Nm
|
|
file.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr strsuftoll 3 ,
|
|
.Xr ftpchroot 5 ,
|
|
.Xr ftpusers 5 ,
|
|
.Xr ftpd 8
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
functionality was implemented in
|
|
.Nx 1.3
|
|
and later releases by Luke Mewburn, based on work by Simon Burge.
|