\" $NetBSD: creds_msdos.8,v 1.6 2024/05/13 23:10:47 gutteridge Exp $

\" $NetBSD: creds_msdos.8,v 1.6 2024/05/13 23:10:47 gutteridge Exp $
\"
\" Copyright (c) 2019 Matthew R. Green
\" All rights reserved.
\"
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Dd June 10, 2019
Dt CREDS_MSDOS 8
Os
Sh NAME
Nm creds_msdos
Nd automatically add login credentials from MS-DOS partition
Sh SYNOPSIS
Nm
Ar start
Sh DESCRIPTION
The
Nm
rc.d script allows automatic addition of login credentials during boot
using a special file found on the MS-DOS partition of a bootable image.
This script is not distributed with the normal system and is only
included with pre-installed bootable images.
The goal is to allow remote access of the system without having to
edit the primary root file system (which may not be accessible from
the host the image is being written from), but place this information
in the MS-DOS partition that most platforms can easily access.
Pp
Typically, an installable image (such as
Pa arm64.img )
is written to an SD card or similar media, and has both a native FFS
partition as well as an MS-DOS partition for booting.
If this script is enabled and has been pointed at the boot partition
it will inspect the file
Pa creds.txt
for any credentials to be added to the system.
Pp
The following list gives the supported options in the credentials files.
In all cases
Ar user
is the username to be created, and the user will be added to the
Ql wheel
group.
Bl -tag -width Ic
\"
It Ic sshkeyfile Ar user Ar keyfile
Look for the
Ar keyfile
in the MS-DOS boot partition and merge ssh keys from this file into user's
Pa ~/.ssh/authorized_keys
file.
\"
It Ic sshkey Ar user Ar keystring
Add the
Ar keystring
to the user's
Pa ~/.ssh/authorized_keys
file.
\"
It Ic useraddpwhash Ar user Ar pwhash
Use
Ar pwhash
as the users's password hash.
\"
It Ic useradd Ar user Ar password
Use
Ar password
as the users's unencrypted raw password that will be hashed.
Pp
This method is
Em not recommended
as it leaves unencrypted passwords around until such time that the script runs.
If this method is used then the
Pa creds.txt
file will be shredded and deleted using
Ql rm -P
after the credentials are updated.
El
Sh FILES
Pa /boot/creds.txt
Sh SEE ALSO
Xr pwhash 1 ,
Xr rm 1 ,
Xr ssh 1 ,
Xr ssh_config 5 ,
Xr mount_msdos 8 ,
Xr sshd 8 ,
Xr useradd 8
Sh HISTORY
The
Nm
script appeared in
Nx 9.0 .
Sh AUTHORS
An Matthew R. Green Aq Mt [email protected] .