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ssh - Restore file permission on CentOS 7

itemprop="text">


I managed to messed up
server permissions on entire server



chown root:root -R
/
chmod 777 -R
/


How to fix it?

I can't login as root using terminal on that machine it show error "Invalid
password" and SSH shows error "connection reset by remote
server"



Note:

I
try to reinstall CentOS 7 using USB. but got stuck during Select disk stage as it will
not let me select / without formating it.
This question explains what my
commands did. href="https://serverfault.com/questions/364677/why-is-chmod-r-777-destructive">Why is
"chmod -R 777 /" destructive?


class="post-text" itemprop="text">
class="normal">Answer



I managed
to Solve it, here are the steps i followed.



To
fix the issue of root login using terminal.




  1. boot using bootable
    USB/CD

  2. select recover and mound disk


  3. go to mounted folder and run
    chown root -R / and chmod 755 -R
    /

  4. chmod 0700 -R
    /root/.ssh

  5. reboot normally

  6. Ignore SElinux contexts warnings and let it re-store
    contexts



After this you
will be able to login to machine using root



To
fix file permission and owners info use these commands rpm --setperms
{packagename}
and rpm --setugids
{packagename}




To fix you
all system just rum them in loop href="http://www.cyberciti.biz/tips/reset-rhel-centos-fedora-package-file-permission.html"
rel="nofollow noreferrer">more details
here



for p in $(rpm
-qa); do rpm --setperms $p; done
for p in $(rpm -qa); do rpm --setugids $p;
done


It will fix
permissions for most of packages.



If you can't
login using SSH follow these
steps





  1. systemctl
    restart sshd
    It will
    fail

  2. systemctl status sshd It
    will show you the file with wrong permissions

  3. Fix the
    file permission using chmod 0700 -R /root/.ssh OR
    chmod 0700 your_file_path

  4. repeat this process until SSH service start
    successfully



Using these
steps I managed to restore all essential services on my server.



Finally to restore default permissions for
vhosts created using Plesk.

I use this command as described on
plesk
website



#
/usr/local/psa/bin/repair
--restore-vhosts-permissions


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