Root user not recognizing on Solaris-10 (shadow file corruption) Post: 303040060

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Operating Systems Solaris Root user not recognizing on Solaris-10 (shadow file corruption) Post 303040060 by solaris_1977 on Tuesday 22nd of October 2019 07:05:36 PM

10-22-2019

Registered User

Root user not recognizing on Solaris-10 (shadow file corruption)

Hello,
I got into a wired state on one of solaris 10 server. When I noticed that server is having some issue, I found that there were dumpadm.conf entries in /etc/shadow and real entries were wiped of. Probably somebody fat fingers.
I was able to boot into failsafe, break SVM mirror, copied /etc/oshadow to /etc/shadow and boot into single user mode. But there is still some issue and I am not sure how to fix it. OS is not able to recognize root, looks like its mapping with UID is broken. shadow file is owned by "1 0". If I touch a new file, that also created with same ownership.
I boot into failsafe mode and there it already shows ownership of root (/a/etc/shadow). Then I did "chown 0:sys /a/etc/shadow" and boot again in single user mode. Still no luck.

Code:

# ls -l /etc/passwd /etc/shadow
-rw-r--r--   1 0        sys         1846 Oct 22 15:07 /etc/passwd
-r--------   1 0        sys         1818 Oct 22 15:08 /etc/shadow
# id
uid=0 gid=0(root)
# id -a
uid=0 gid=0(root)
# id -a root
id: invalid user name: "root"
# cat /etc/shadow | grep -i root
root:x:18191::::::
# cat /etc/passwd | grep -i root
root:x:0:0:Super-User:/:/sbin/sh
# chown root:sys /etc/shadow
chown: unknown user id root
#

Please suggest, how can I fix it. Boot from Solaris DVD is last option as, this server is located remotely.

Thanks

Last edited by solaris_1977; 10-22-2019 at 11:29 PM..

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nbdst

NBDST(8)						    BSD System Manager's Manual 						  NBDST(8)

NAME

     nbdst -- NetBoot deferred shadow tool

SYNOPSIS

     nbdst [-recycle | -preallocate size] devnode shadowfile

DESCRIPTION

     nbdst is used during NetBoot to associate a shadow file with the disk image being used as the root device. After the shadow file is attached,
     subsequent writes to the root device will be redirected to the shadow file, which normally resides on local storage.  nbdst is invoked by
     /etc/rc.netboot

ARGUMENTS

     The following arguments must be specified:
     devnode	    The device node of the root device, in the form "disk0"
     shadowfile     Path to a shadow file which will be created and associated with the NetBoot root device

OPTIONS

     -recycle  If a shadow file already exists, reset it and use it again.  Otherwise, information written to an existing shadow file will reap-
	       pear.  Reusing a previous shadow file without resetting it requires that the shadow file be created with the same base image.

     -preallocate size
	       Set the shadow file to the given size up front.	This forces a reset of the shadow file (like -recycle).

NOTE

     nbdst can only be run as root.

SEE ALSO

     hdiutil(1), hdik(8)

macOS								    29 Apr 2003 							     macOS

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