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Full Discussion: Root user not recognizing on Solaris-10 (shadow file corruption)
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
Old 10-22-2019
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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LEARN ABOUT X11R4

install-solaris

install-solaris(1M)													       install-solaris(1M)

NAME

       install-solaris - install the Solaris operating system

SYNOPSIS

       install-solaris

       install-solaris	invokes  the  Solaris  Install	program. Depending on graphical capability and available memory at the time of invocation,
       install-solaris invokes either a text-based installer or a graphical installer.

       The following minimum requirements for physical memory dictate which features are available during installation:

       For SPARC machines:

       128 MB

	   Minimum physical memory for all installation types

       128 MB

	   Minimum physical memory required for windowing system

       384 MB

	   Minimum physical memory required for graphical-based installation

       For x86 machines:

       256 MB

	   Minimum physical memory for all installation types

       256 MB

	   Minimum physical memory required for windowing system

       512 MB

	   Minimum physical memory required for graphical-based installation

       In some cases, even if the minimum physical memory is present, available virtual memory after system startup can limit the number  of  fea-
       tures available.

       install-solaris	exists	only  on  the Solaris installation media (CD or DVD) and should be invoked only from there. Refer to the  for more
       details.

       install-solaris allows installation of the operating system onto any standalone system. install-solaris loads the software available on the
       installation media. Refer to the  for disk space requirements.

       Refer to the  for more information on the various menus and selections.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcdrom  (Solaris instal-  |
       |			     |lation media)		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

       pkginfo(1), install(1M), pkgadd(1M), attributes(5)

       It is advisable to exit install-solaris by means of the exit options in the install-solaris menus.

								    23 Sep 2005 					       install-solaris(1M)
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