How to telnet as root

[qingbo]

After I issued a 'chmod o-rwx' at root directory as root, I can no longer telnet as a regular user (don't laugh at what I did. I know it's dumm). It will say 'no shell'. Now I can only ftp to the site as root or regular user. The problem is I can't telnet using root ('No system console'). And I can't physically go to the site at this time. Is there anyway to change that and allow me to telnet?

It's solaris 2.6

Thanks

hehe

 

[jad]

umm, yes, but you really want to turn it back straight away

2 ways ...

1 add a '.rhosts' file with the name of your current machine to the home directory of root on the target system and 'rlogin' to it ...

or you can modify '/etc/default/login' and comment out the 'CONSOLE' line

ftp this file to you, make the changes and ftp it back ...

(at least you didn't do what i did and accidentally modify the passwd file so that root doesn't have a valid shell

another way of accessing it, if you have it, is to use samba ... sparingly

add the /etc directory to the samba configuration (with SWAT) and then connect as root and modify the file directly ... but this is kinda a last resort.

hope some of this helps

 

[qingbo]

I commented out the 'console' in the 'etc/default/login' file and I was able to login as root. Thanks

Now when I login as other use, it says 'ld.so.1: internal: malloc failed'.

What is that?
thanks
Qingbo

 

[jad]

it can't access the library directories because you chmod'd them ...

ok ... i guess you'll want to know what they were ... sorta

well cd to /usr and chmod -R o+rx .

that should cure it for you

you'll also want to do a few other checks, but it's a safe bet that /usr is all allowed to be accessed by any user.

 

[d3funct]

Are you using NIS on the system? If so you can add a root entry and specify the shell as /sbin/sh and then do a ypmake to update root. I had a similar problem (for a different reason ) where I had no shell for root.
I'd changed the shell to /bin/ksh for root but on Solaris root's default shell should always be /sbin/sh. Anyway, I was able to correct the problem by doing the above and I was then able to access the server fix the problem, then comment out the root entry on my NIS mapfile and re-issue ypmake to clean up. Hope it helps.
Jon Zimmer
jon.zimmer@pf.net
The software required `Windows 95 or better', so I installed Linux.

 

[jad]

no we're creating NIS now ... but didn't have it then

In a NIS system you should really have root specific to each machine, as this can be a security issue, and there can be a problem if the NIS screws up

(actually i changed the shell, by copying a linux compatible passwd file on to one of our linux boxes, and linux doesn't have /sbin/sh

i have some code that converts passwd+shadow on Solaris to old style single passwd files ... (aka Linux 2.0)

 

[qingbo]

I was able to login as a regulare user by 'chmod'. Now it has this error:

'segmentation fault (out of memory)'

Anyone has experience with that?

Qingbo

 

[teddy74]

Hi !

check if the userid has write permissions in his home directory and also if he is able to write in to /tmp
,if not then try giving write permissions , hope it would help

rajesh
;-)

 

[jad]

sounds good!

except that home directories should be owned by the user, so i think its the /tmp directory ...

chmod +t /tmp
chmod a+wrx /tmp

 

[sunman]

Jad-

I liked your ftp approach - very creative. By the way, very early in my Unix career, I exactly edited the passwd file and changed the /sbin/sh to /bin/sh which unfortunately, /bin does not have sh. I had to boot mini-root from cd ....

Talk to you later.

Al