I've been trying to configure my server for security, but I have no idea what I'm doing. I'm following various guides to the best of my ability - one of them being the following: http://wiki.centos.org/HowTos/OS_Protection
After making changes and logging out, my passwords no longer work when attempting to log back in. These are the two changes that I suspect may be causing the issue:
1) I changed the password protection from md5 to sha512 with the following code:
authconfig --passalgo=sha512 --update
2) I changed
/etc/pam.d/system-auth to look like this:
touch /var/log/tallylog cat << 'EOF' > /etc/pam.d/system-auth #%PAM-1.0 # This file is auto-generated. # User changes will be destroyed the next time authconfig is run. auth required pam_env.so auth sufficient pam_unix.so nullok try_first_pass auth requisite pam_succeed_if.so uid >= 500 quiet auth required pam_deny.so auth required pam_tally2.so deny=3 onerr=fail unlock_time=60 account required pam_unix.so account sufficient pam_succeed_if.so uid < 500 quiet account required pam_permit.so account required pam_tally2.so per_user password requisite pam_cracklib.so try_first_pass retry=3 minlen=9 lcredit=-2 ucredit=-2 dcredit=-2 ocredit=-2 password sufficient pam_unix.so sha512 shadow nullok try_first_pass use_authtok remember=10 password required pam_deny.so session optional pam_keyinit.so revoke session required pam_limits.so session [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid session required pam_unix.so EOF
How can I fix this? Am I going to need to reinstall CentOS and start from scratch?