Ssh – Root only has read permission for /etc/ssh/sshd_config

gitnetwork-attached-storagerootssh

I'm trying to edit my /etc/ssh/sshd_config file as per these instructions to properly set up git on my Synology NAS:
http://www.wonko.de/2010/04/set-up-git-on-synology-nas.html (step 6)

However, when I tried to save the modified sshd_config file while logged in as root, I got the following error:

"/etc/ssh/sshd_config" File is read only

When I typed in "ls -l /etc/ssh/sshd_config" I got:

--rw-r--r-- 1 root root 3745 May 27 06:32 /etc/ssh/sshd_config

Does anyone know how I can change these permissions so they're read/write for root?

Best Answer

lsattr will give you something like this

$:/etc/ssh# lsattr sshd_config
s---ia------------- sshd_config

from "man chattr"

A file with the ‘a’ attribute set can only be open in append mode for writing. Only the superuser or a process possessing the CAP_LINUX_IMMUTABLE capability can set or clear this attribute.

A file with the ‘i’ attribute cannot be modified: it cannot be deleted or renamed, no link can be created to this file and no data can be written to the file. Only the superuser or a process possessing the CAP_LINUX_IMMUTABLE capability can set or clear this attribute.

chattr -ia sshd_config

does the job

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