mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-11-14 22:32:30 +01:00
8b1a5062e0
Some people expect jail.conf(5) to have a list of jail parameters. jail(8) contains a comprehensive list of all parameters to be used during jail invocation or in jail.conf. Highlighting where to look for jail parameters seems a reasonable solution. PR: 244569 Reported by: joneum@ Approved by: 0mp (manpages, mentor) Reviewed by: debdrup Differential Revision: https://reviews.freebsd.org/D28701
233 lines
7.0 KiB
Groff
233 lines
7.0 KiB
Groff
.\" Copyright (c) 2012 James Gritton
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd April 18, 2021
|
|
.Dt JAIL.CONF 5
|
|
.Os
|
|
.Sh NAME
|
|
.Nm jail.conf
|
|
.Nd configuration file for
|
|
.Xr jail 8
|
|
.Sh DESCRIPTION
|
|
A
|
|
.Xr jail 8
|
|
configuration file consists of one or more jail definitions statements,
|
|
and parameter or variable statements within those jail definitions.
|
|
A jail definition statement looks something like a C compound statement.
|
|
A parameter statement looks like a C assignment,
|
|
including a terminating semicolon.
|
|
.Pp
|
|
The general syntax of a jail definition is:
|
|
.Bd -literal -offset indent
|
|
jailname {
|
|
parameter = "value";
|
|
parameter = "value";
|
|
...
|
|
}
|
|
.Ed
|
|
.Pp
|
|
Each jail is required to have a
|
|
.Va name
|
|
at the front of its definition.
|
|
This is used by
|
|
.Xr jail 8
|
|
to specify a jail on the command line and report the jail status,
|
|
and is also passed to the kernel when creating the jail.
|
|
.Ss Parameters
|
|
A jail is defined by a set of named parameters, specified inside the
|
|
jail definition.
|
|
.Em See
|
|
.Xr jail 8
|
|
.Em for a list of jail parameters
|
|
passed to the kernel, as well as internal parameters used when creating and
|
|
removing jails.
|
|
.Pp
|
|
A typical parameter has a name and a value.
|
|
Some parameters are boolean and may be specified with values of
|
|
.Dq true
|
|
or
|
|
.Dq false ,
|
|
or as valueless shortcuts, with a
|
|
.Dq no
|
|
prefix indicating a false value.
|
|
For example, these are equivalent:
|
|
.Bd -literal -offset indent
|
|
allow.mount = "false";
|
|
allow.nomount;
|
|
.Ed
|
|
.Pp
|
|
Other parameters may have more than one value.
|
|
A comma-separated list of values may be set in a single statement,
|
|
or an existing parameter list may be appended to using
|
|
.Dq += :
|
|
.Bd -literal -offset indent
|
|
ip4.addr = 10.1.1.1, 10.1.1.2, 10.1.1.3;
|
|
|
|
ip4.addr = 10.1.1.1;
|
|
ip4.addr += 10.1.1.2;
|
|
ip4.addr += 10.1.1.3;
|
|
.Ed
|
|
.Pp
|
|
Note the
|
|
.Va name
|
|
parameter is implicitly set to the name in the jail definition.
|
|
.Ss String format
|
|
Parameter values, including jail names, can be single tokens or quoted
|
|
strings.
|
|
A token is any sequence of characters that aren't considered special in
|
|
the syntax of the configuration file (such as a semicolon or
|
|
whitespace).
|
|
If a value contains anything more than letters, numbers, dots, dashes
|
|
and underscores, it is advisable to put quote marks around that value.
|
|
Either single or double quotes may be used.
|
|
.Pp
|
|
Special characters may be quoted by preceding them with a backslash.
|
|
Common C-style backslash character codes are also supported, including
|
|
control characters and octal or hex ASCII codes.
|
|
A backslash at the end of a line will ignore the subsequent newline and
|
|
continue the string at the start of the next line.
|
|
.Ss Variables
|
|
A string may use shell-style variable substitution.
|
|
A parameter or variable name preceded by a dollar sign, and possibly
|
|
enclosed in braces, will be replaced with the value of that parameter or
|
|
variable.
|
|
For example, a jail's path may be defined in terms of its name or
|
|
hostname:
|
|
.Bd -literal -offset indent
|
|
path = "/var/jail/$name";
|
|
|
|
path = "/var/jail/${host.hostname}";
|
|
.Ed
|
|
.Pp
|
|
Variable substitution occurs in unquoted tokens or in double-quoted
|
|
strings, but not in single-quote strings.
|
|
.Pp
|
|
A variable is defined in the same way a parameter is, except that the
|
|
variable name is preceded with a dollar sign:
|
|
.Bd -literal -offset indent
|
|
$parentdir = "/var/jail";
|
|
path = "$parentdir/$name";
|
|
.Ed
|
|
.Pp
|
|
The difference between parameters and variables is that variables are
|
|
only used for substitution, while parameters are used both for
|
|
substitution and for passing to the kernel.
|
|
.Ss Wildcards
|
|
A jail definition with a name of
|
|
.Dq *
|
|
is used to define wildcard parameters.
|
|
Every defined jail will contain both the parameters from its own
|
|
definition statement, as well as any parameters in a wildcard
|
|
definition.
|
|
.Pp
|
|
Variable substitution is done on a per-jail basis, even when that
|
|
substitution is for a parameter defined in a wildcard section.
|
|
This is useful for wildcard parameters based on e.g. a jail's name.
|
|
.Pp
|
|
Later definitions in the configuration file supersede earlier ones, so a
|
|
wildcard section placed before (above) a jail definition defines
|
|
parameters that could be changed on a per-jail basis.
|
|
Or a wildcard section placed after (below) all jails would contain
|
|
parameters that always apply to every jail.
|
|
Multiple wildcard statements are allowed, and wildcard parameters may
|
|
also be specified outside of a jail definition statement.
|
|
.Pp
|
|
If hierarchical jails are defined, a partial-matching wildcard
|
|
definition may be specified.
|
|
For example, a definition with a name of
|
|
.Dq foo.*
|
|
would apply to jails with names like
|
|
.Dq foo.bar
|
|
and
|
|
.Dq foo.bar.baz .
|
|
.Ss Comments
|
|
The configuration file may contain comments in the common C, C++, and
|
|
shell formats:
|
|
.Bd -literal -offset indent
|
|
/* This is a C style comment.
|
|
* It may span multiple lines.
|
|
*/
|
|
|
|
// This is a C++ style comment.
|
|
|
|
# This is a shell style comment.
|
|
.Ed
|
|
.Pp
|
|
Comments are legal wherever whitespace is allowed, i.e. anywhere except
|
|
in the middle of a string or a token.
|
|
.Sh EXAMPLES
|
|
.Bd -literal
|
|
# Typical static defaults:
|
|
# Use the rc scripts to start and stop jails. Mount jail's /dev.
|
|
exec.start = "/bin/sh /etc/rc";
|
|
exec.stop = "/bin/sh /etc/rc.shutdown jail";
|
|
exec.clean;
|
|
mount.devfs;
|
|
|
|
# Dynamic wildcard parameter:
|
|
# Base the path off the jail name.
|
|
path = "/var/jail/$name";
|
|
|
|
# A typical jail.
|
|
foo {
|
|
host.hostname = "foo.com";
|
|
ip4.addr = 10.1.1.1, 10.1.1.2, 10.1.1.3;
|
|
}
|
|
|
|
# This jail overrides the defaults defined above.
|
|
bar {
|
|
exec.start = '';
|
|
exec.stop = '';
|
|
path = /;
|
|
mount.nodevfs;
|
|
persist; // Required because there are no processes
|
|
}
|
|
.Ed
|
|
.Sh SEE ALSO
|
|
.Xr jail_set 2 ,
|
|
.Xr rc.conf 5 ,
|
|
.Xr jail 8 ,
|
|
.Xr jls 8
|
|
.Sh HISTORY
|
|
The
|
|
.Xr jail 8
|
|
utility appeared in
|
|
.Fx 4.0 .
|
|
The
|
|
.Nm
|
|
file was added in
|
|
.Fx 9.1 .
|
|
.Sh AUTHORS
|
|
.An -nosplit
|
|
The jail feature was written by
|
|
.An Poul-Henning Kamp
|
|
for R&D Associates
|
|
who contributed it to
|
|
.Fx .
|
|
.Pp
|
|
.An James Gritton
|
|
added the extensible jail parameters and configuration file.
|