creds_msdos(8) - NetBSD Manual Pages

CREDS_MSDOS(8)          NetBSD System Manager's Manual          CREDS_MSDOS(8)


NAME

     creds_msdos -- automatically add login credentials from MSDOS partition


SYNOPSIS

     creds_msdos start


DESCRIPTION

     The creds_msdos rc.d script allows automatic addition of login creden-
     tials during boot using a special file found on the MSDOS 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 MSDOS partition that
     most platforms can easily access.

     Typically, an installable image (such as arm64.img) is written to an SD
     card or similar media, and has both a native FFS partition as well as an
     MSDOS partition for booting.  If this script is enabled and has been
     pointed at the boot partition it will inspect the file creds.txt for any
     credentials to be added to the system.

     These are the supported options in the credentials files:
           sshkeyfile user keyfile
           sshkey user keystring
           useraddpwhash user pwhash
           useradd user password

     In all cases user is the username to be added, and the user will be added
     to the ``wheel'' group.

     The sshkeyfile method looks in the MSDOS boot partition for the specified
     file and merges ssh keys from this file into user's
     ~/.ssh/authorized_keys file.

     The sshkey method adds the keystring to the user's ~/.ssh/authorized_keys
     file.

     The useraddpwhash method uses pwhash as the users's password hash.

     The above three methods are the preferred methods.

     For the useradd method password is an unencrypted raw password that will
     be hashed and added to the system.  This method is not recommended as it
     leaves unencrypted passwords around until such time that the script runs.
     If this method is used then the creds.txt file will be shredded and
     deleted using ``rm -P'' after the credentials are updated.


FILES

     /boot/creds.txt


SEE ALSO

     pwhash(1), rm(1), ssh(1), ssh_config(5), mount_msdos(8), sshd(8),
     useradd(8)


HISTORY

     The creds_msdos script appeared in NetBSD 9.0.


AUTHORS

     Matthew R. Green <mrg@eterna.com.au>.

NetBSD 10.99                     June 10, 2019                    NetBSD 10.99