On Wed, 31 Mar 2021 10:59:10 -0700, in gmane.comp.hardware.beagleboard.user
Bob Hammond <propgrinder-re5jqeeqqe8avxtiumw...@public.gmane.org> wrote:
>debian@beaglebone:/mnt/media/etc$ su root
>Password:
>su: Authentication failure
>debian@beaglebone:/mnt/media/etc$ su root
>Password:
>su: Authentication failure
>debian@beaglebone:/mnt/media/etc$ sudo nano shadow
> GNU nano 2.7.4 File: shadow
>
I'm beginning to get lost in just what machine is which in this
discussion.
You obviously have some device that boots and lets you sign in. I'm
presuming you then mounted an SD card (or subdirectory of said card).
Note that, by default for quite some years, a stock Beaglebone does not
assign a password to the root account (or it is something impossible to
enter), and prevents direct login as root. Your "su root" is likely failing
for that reason. However, you do have sudo privileges (had you run sudo
recently before the above cut&paste -- on normal Beagle images, the first
run of sudo [and runs after some timeout period] prompt for the user
password, but you don't appear to have had to enter that).
Try entering
sudo su
or maybe
sudo bash
debian@beaglebone:~$ sudo su
[sudo] password for debian:
root@beaglebone:/home/debian# exit
exit
debian@beaglebone:~$ sudo bash
root@beaglebone:/home/debian# exit
exit
debian@beaglebone:~$
debian@beaglebone:~$ sudo cat /etc/passwd
root:x:0:0:root:/root:/bin/bash
...
debian@beaglebone:~$ sudo cat /etc/shadow
root:$6$5qgZEu6UrcE6p.vz$HcTDnuyYnQDb3QCslR59OSMIor.Y4ugey8DNqPvoNDvZ8BFBZqIbQQkKBpf9SeT3Bma5xG8EsIX7bt1OWUKmV/:18493:0:99999:7:::
...
Granted, those are for the local machine. Have you tried "diff"ing the
running (eMMC?) version of the files with the files on the mounted SD? Also
compare the file owner/group and access (hmmm... group and gshadow files
too)
debian@beaglebone:~$ ls -l /etc
total 784
...
-rw-r--r-- 1 root root 1095 Feb 24 09:41 group
-rw-r--r-- 1 root root 1086 Oct 1 01:59 group-
-rw-r----- 1 root shadow 933 Feb 24 09:41 gshadow
-rw-r----- 1 root shadow 924 Oct 1 01:59 gshadow-
...
-rw-r--r-- 1 root root 1600 Aug 19 2020 passwd
-rw-r--r-- 1 root root 1533 Aug 19 2020 passwd-
...
-rw-r----- 1 root shadow 934 Aug 19 2020 shadow
-rw-r----- 1 root shadow 902 Aug 19 2020 shadow-
...
debian@beaglebone:~$
Unless you've created a lot of custom users on the SD card, it could be
worth just copying the files (using sudo) from the running machine to the
SD card, and verifying (ls) they have the correct privileges/owner/group
after the copy.
--
Dennis L Bieber
--
For more options, visit http://beagleboard.org/discuss
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