Reset Linux filesystem permissions

I just did something really dumb and I'm wondering if there's any way to reverse it. So I have an AWS EC2 server instance and I was trying to edit the php.ini in /etc. It kept telling me that I didn't have permissions to write to it, so I just thought, "Okay, well nobody's ever really going to see this site, I'll just chmod everything." So I did chmod -R 750 ... I know... I know... What was I thinking. So now it messed everything up and I can't SSH in with my ec2-user login anymore... Is there any way to fix this or did I just permanently wreck it?