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jail(8) with the "exec.clean" parameter not only cleans the enviromnent variables before running commands, but also changes to the user's home directory. While this makes sense when auser is specified (via one of the exec.*_user parameters), it leads to all commands being run in the jail's /root directory even in the absence of an explicitly specified user. This can lead to problems when e.g. rc scripts are run from that non-world-readable directory, and run counter to expectations that jail startup is analogous to system startup. Restrict this behvaiour to only users exlicitly specified, either via the command line or jail parameters, but not the implicit root user. While this changes long-stand practice, it's the more intuitive action. jexec(8) has the same problem, and the same fix. PR: 277210 Reported by: johannes.kunde at gmail Differential Revision: https://reviews.freebsd.org/D46226 (cherry picked from commit 5cf705491727dd963485f9911ee3d52c3bf148db)
129 lines
3.6 KiB
Groff
129 lines
3.6 KiB
Groff
.\"
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.\" Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
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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 August 12, 2024
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.Dt JEXEC 8
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.Os
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.Sh NAME
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.Nm jexec
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.Nd "execute a command inside an existing jail"
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.Sh SYNOPSIS
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.Nm
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.Op Fl l
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.Op Fl u Ar username | Fl U Ar username
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.Ar jail Op Ar command ...
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.Sh DESCRIPTION
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The
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.Nm
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utility executes
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.Ar command
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inside the
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.Ar jail
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identified by its jid or name.
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If
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.Ar command
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is not specified then the user's shell is used.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl l
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Execute in a clean environment.
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The environment is discarded except for
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.Ev HOME , SHELL , TERM , USER ,
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and anything from the login class capability database for the user.
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.Ev PATH
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is set to "/bin:/usr/bin".
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If a user is specified (via
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.Fl u
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or
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.Fl U ) ,
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commands are run from that (possibly jailed) user's directory.
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.It Fl u Ar username
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The user name from host environment as whom the
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.Ar command
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should run.
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This is the default.
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.It Fl U Ar username
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The user name from jailed environment as whom the
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.Ar command
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should run.
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.El
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.Sh EXAMPLES
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.Ss Example 1 : Open a shell in a jail
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The following command specifies a jail by its name and utilizes the current
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user's shell:
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.Pp
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.Dl # jexec name
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.Pp
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It is also possible to specify a jail by its jid:
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.Pp
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.Dl # jexec JID
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.Ss Example 2 : Run a single command without opening a shell
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The following command runs
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.Ql uname -a
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in a jail called
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.Dq name .
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Since a command is specified explicitly,
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.Nm
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does not spawn an interactive shell.
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Instead,
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.Nm
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executes the specified command directly.
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.Pp
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.Dl # jexec name uname -a
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.Ss Example 3 : Open a shell in a jail with a clean environment
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The following command opens a
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.Xr sh 1
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shell in a jail with a clean environment:
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.Pp
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.Dl # jexec -l name sh
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.Ss Example 4 : Open a shell in a jail with the login command
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The following command utilizes
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.Xr login 1
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to access the jail, submitting an audit record, and displaying the
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user's last login, system copyright, and
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.Xr motd 5
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message:
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.Pp
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.Dl # jexec -l name login -f root
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.Sh SEE ALSO
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.Xr jail_attach 2 ,
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.Xr jail 8 ,
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.Xr jls 8
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.Sh HISTORY
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The
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.Nm
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utility was added in
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.Fx 5.1 .
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.Sh BUGS
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If the jail is not identified by
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.Ar jid
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there is a possible race in between the lookup of the jail
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and executing the command inside the jail.
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Giving a
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.Ar jid
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has a similar race as another process can stop the jail and
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start another one after the user looked up the
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.Ar jid .
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