How to setup .ssh folder permissions
chmod 700 ~/.ssh # (drwx------)
chmod 600 ~/.ssh/authorized_keys # (-rw-------)
chmod 600 ~/.ssh/id_rsa # (-rw-------)
chmod 644 ~/.ssh/id_rsa.pub # (-rw-r--r--)
chmod 755 ~ # (drwxr-xr-x)
ref: https://superuser.com/questions/215504/permissions-on-private-key-in-ssh-folder
