5cc9fabecf
SVN r280384 updated the maximum password length from 16 bytes to 255. The manual was not updated to reflect this. Found while working on kern/207069. MFC after: 3 days X-MFC-to: stable/11 stable/10 Sponsored by: Smule, Inc.
168 lines
4.6 KiB
Groff
168 lines
4.6 KiB
Groff
.\" Copyright (c) 2011-2018 Devin Teske
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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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.\" $FreeBSD$
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.\"
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.Dd June 24, 2018
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.Dt CHECK-PASSWORD.4TH 8
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.Os
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.Sh NAME
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.Nm check-password.4th
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.Nd FreeBSD password-checking boot module
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.Sh DESCRIPTION
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The file that goes by the name of
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.Nm
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is a set of commands designed to do one or more of the following:
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.Pp
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.Dl o Prevent booting without password
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.Dl o Prevent modification of boot options without password
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.Dl o Provide a password to mount geli(8) encrypted root disk(s)
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.Pp
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The commands of
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.Nm
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by themselves are not enough for most uses.
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Please refer to the
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examples below for the most common situations, and to
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.Xr loader 8
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for additional commands.
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.Pp
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Before using any of the commands provided in
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.Nm ,
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it must be included
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through the command:
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.Pp
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.Dl include check-password.4th
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.Pp
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This line is present in
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.Pa /boot/loader.4th
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file, so it is not needed (and should not be re-issued) in a normal setup.
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.Pp
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The commands provided by it are:
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.Pp
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.Bl -tag -width disable-module_module -compact -offset indent
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.It Ic check-password
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Multi-purpose function that can protect the interactive boot menu,
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prevent boot without password, or prompt for geli(8) passphrase
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.Pq depending on Xr loader.conf 5 settings .
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.Pp
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First checks
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.Va bootlock_password
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and if-set, the user cannot continue until the correct password is entered.
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.Pp
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Next, checks
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.Va geom_eli_passphrase_prompt
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and if set to
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.Li YES
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.Pq case-insensitive
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prompts the user to enter their GELI password for later mounting of the root
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device(s) during boot.
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.Pp
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Last, checks
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.Va password
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and if-set, tries to
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.Ic autoboot
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and only prompts for password on failure or user-interrupt.
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See
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.Xr loader.conf 5
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for additional information.
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.El
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.Pp
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The environment variables that effect its behavior are:
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.Bl -tag -width bootlock_password -offset indent
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.It Va bootlock_password
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Sets the bootlock password (up to 255 characters long) that is required by
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.Ic check-password
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to be entered before the system is allowed to boot.
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.It Va geom_eli_passphrase_prompt
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Selects whether loader(8) will prompt for GELI credentials, handing-off to the
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kernel for later mounting of
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.Xr geli 8
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encrypted root device(s).
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.It Va password
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Sets the password (up to 255 characters long) that is required by
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.Ic check-password
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before the user is allowed to visit the boot menu.
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.El
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.Sh FILES
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.Bl -tag -width /boot/check-password.4th -compact
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.It Pa /boot/loader
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The
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.Xr loader 8 .
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.It Pa /boot/check-password.4th
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.Nm
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itself.
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.It Pa /boot/loader.rc
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.Xr loader 8
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bootstrapping script.
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.El
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.Sh EXAMPLES
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Standard i386
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.Pa /boot/loader.rc :
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.Pp
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.Bd -literal -offset indent -compact
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include /boot/loader.4th
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check-password
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.Ed
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.Pp
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Set a password in
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.Xr loader.conf 5
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to prevent modification of boot options:
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.Pp
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.Bd -literal -offset indent -compact
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password="abc123"
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.Ed
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.Pp
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Set a password in
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.Xr loader.conf 5
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to prevent booting without password:
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.Pp
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.Bd -literal -offset indent -compact
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bootlock_password="boot"
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.Ed
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.Pp
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Add the following to
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.Xr loader.conf 5
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to generate a prompt at boot to collect GELI credentials for mounting
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.Xr geli 8
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encrypted root device(s):
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.Pp
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.Bd -literal -offset indent -compact
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geom_eli_passphrase_prompt="YES"
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.Ed
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.Sh SEE ALSO
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.Xr loader.conf 5 ,
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.Xr loader 8 ,
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.Xr loader.4th 8
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.Sh HISTORY
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The
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.Nm
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set of commands first appeared in
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.Fx 9.0 .
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.Sh AUTHORS
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The
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.Nm
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set of commands was written by
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.An -nosplit
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.An Devin Teske Aq dteske@FreeBSD.org .
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