diff --git a/cloud_setup.sh b/cloud_setup.sh new file mode 100644 index 0000000..85463cb --- /dev/null +++ b/cloud_setup.sh @@ -0,0 +1,300 @@ +#!/bin/sh +PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin + +# General hardening +echo "umask 027" >> /etc/profile +rm /etc/cron.deny 2> /dev/null +rm /etc/at.deny 2> /dev/null +echo 'root' > /etc/cron.allow +echo 'root' > /etc/at.allow +chown root:root /etc/cron* +chown root:root /etc/at* +echo 'sshd : ALL : ALLOW' > /etc/hosts.allow +echo 'ALL: LOCAL, 127.0.0.1' >> /etc/hosts.allow +echo 'ALL: PARANOID' > /etc/hosts.deny +chmod 644 /etc/hosts.allow +chmod 644 /etc/hosts.deny + +# Hide PID 2 +echo 'proc /proc proc defaults,hidepid=2 0 0' >> /etc/fstab + +# Disable unattended-upgrades to prevent it from holding the dpkg frontend lock +systemctl daemon-reload +systemctl disable unattended-upgrades.service +systemctl stop unattended-upgrades.service + +# Check for Updates +apt update + +# Upgrade Ubuntu packages +apt upgrade -y + +# Install needed programs +apt install -y curl jq apt-transport-https htop debhelper ccze tree debsums ca-certificates software-properties-common dh-make neofetch apparmor apparmor-profiles libpam-cgroup libpam-apparmor apparmor-utils apparmor-easyprof haveged auditd audispd-plugins apparmor-profiles-extra autoconf-archive openssh-server fail2ban gnu-standards net-tools gnutls-bin + +# Setup NTP +timedatectl set-ntp true +#timedatectl set-timezone UTC +timedatectl set-timezone America/Los_Angeles +echo 'servers=0.pool.ntp.org 1.pool.ntp.org 2.pool.ntp.org 3.pool.ntp.org' >> /etc/systemd/timesyncd.conf +date + +# Backup SSH_CONFIG +mv /etc/ssh/sshd_config /etc/ssh/sshd_config.bak + +# Harden SSH Settings +cat <<-EOF > /etc/ssh/sshd_config +HostKey /etc/ssh/ssh_host_ed25519_key +HostKey /etc/ssh/ssh_host_rsa_key +HostKey /etc/ssh/ssh_host_ecdsa_key +AcceptEnv LANG LC_* +AllowGroups root sudo +Banner /etc/issue.net +ChallengeResponseAuthentication no +Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes256-ctr +ClientAliveCountMax 0 +ClientAliveInterval 300 +Compression no +HostbasedAuthentication no +IgnoreUserKnownHosts yes +KexAlgorithms curve25519-sha256@libssh.org,ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group-exchange-sha256 +LoginGraceTime 20 +LogLevel VERBOSE +Macs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512,hmac-sha2-256 +MaxAuthTries 3 +MaxSessions 3 +MaxStartups 10:30:60 +PermitEmptyPasswords no +PermitRootLogin no +PubkeyAuthentication yes +PasswordAuthentication no +PermitUserEnvironment no +PrintLastLog yes +PrintMotd no +StrictModes yes +Subsystem sftp internal-sftp +UseDNS no +UsePAM yes +X11Forwarding no +AllowTcpForwarding no +EOF + +# Setup Auditd Rules +cat <<-EOF > /etc/audit/rules.d/server.rules +# Remove any existing rules +-D +# Buffer Size +-b 8192 +# Ignore errors +-i +# Failure Mode +-f 1 +# Audit the audit logs +-w /var/log/audit/ -k auditlog +# Auditd configuration +-w /etc/audit/ -p wa -k auditconfig +-w /etc/libaudit.conf -p wa -k auditconfig +-w /etc/audisp/ -p wa -k audispconfig +# Monitor for use of audit management tools +-w /sbin/auditctl -p x -k audittools +-w /sbin/auditd -p x -k audittools +# Monitor AppArmor configuration changes +-w /etc/apparmor/ -p wa -k apparmor +-w /etc/apparmor.d/ -p wa -k apparmor +# Monitor usage of AppArmor tools +-w /sbin/apparmor_parser -p x -k apparmor_tools +-w /usr/sbin/aa-complain -p x -k apparmor_tools +-w /usr/sbin/aa-disable -p x -k apparmor_tools +-w /usr/sbin/aa-enforce -p x -k apparmor_tools +# Monitor Systemd configuration changes +-w /etc/systemd/ -p wa -k systemd +-w /lib/systemd/ -p wa -k systemd +# Monitor usage of systemd tools +-w /bin/systemctl -p x -k systemd_tools +-w /bin/journalctl -p x -k systemd_tools +# Special files +-a always,exit -F arch=x86_64 -S mknod -S mknodat -k specialfiles +-a always,exit -F arch=b32 -S mknod -S mknodat -k specialfiles +# Mount operations +-a always,exit -F arch=x86_64 -S mount -F auid>=1000 -F auid!=4294967295 -F key=export +-a always,exit -F arch=b32 -S mount -F auid>=1000 -F auid!=4294967295 -F key=export +# Changes to the time +-a always,exit -F arch=x86_64 -S settimeofday -k audit_time_rules +-a always,exit -F arch=x86_64 -S adjtimex -k audit_time_rules +-a always,exit -F arch=x86_64 -S clock_settime -k audit_time_rules +-a always,exit -F arch=b32 -S settimeofday -k audit_time_rules +-a always,exit -F arch=b32 -S adjtimex -k audit_time_rules +-a always,exit -F arch=b32 -S clock_settime -k audit_time_rules +# Cron configuration & scheduled jobs +-w /etc/cron.allow -p wa -k cron +-w /etc/cron.deny -p wa -k cron +-w /etc/cron.d/ -p wa -k cron +-w /etc/cron.daily/ -p wa -k cron +-w /etc/cron.hourly/ -p wa -k cron +-w /etc/cron.monthly/ -p wa -k cron +-w /etc/cron.weekly/ -p wa -k cron +-w /etc/crontab -p wa -k cron +-w /var/spool/cron/crontabs/ -k cron +# User, group, password databases +-w /etc/group -p wa -k audit_rules_usergroup_modification +-w /etc/passwd -p wa -k audit_rules_usergroup_modification +-w /etc/gshadow -p wa -k audit_rules_usergroup_modification +-w /etc/shadow -p wa -k audit_rules_usergroup_modification +-w /etc/security/opasswd -p wa -k audit_rules_usergroup_modification +# MAC-policy +-w /etc/selinux/ -p wa -k MAC-policy +# Monitor usage of passwd +-w /usr/bin/passwd -p x -k passwd_modification +# Monitor for use of tools to change group identifiers +-w /usr/sbin/groupadd -p x -k group_modification +-w /usr/sbin/groupmod -p x -k group_modification +-w /usr/sbin/addgroup -p x -k group_modification +-w /usr/sbin/useradd -p x -k user_modification +-w /usr/sbin/usermod -p x -k user_modification +-w /usr/sbin/adduser -p x -k user_modification +# Monitor module tools +-w /sbin/insmod -p x -k modules +-w /sbin/rmmod -p x -k modules +-w /sbin/modprobe -p x -k modules +-w /usr/sbin/insmod -p x -k modules +-w /usr/sbin/rmmod -p x -k modules +-w /usr/sbin/modprobe -p x -k modules +# Login configuration and information +-w /etc/login.defs -p wa -k login +-w /etc/securetty -p wa -k login +-w /var/log/faillog -p wa -k login +-w /var/run/faillock/ -p wa -k logins +-w /var/log/lastlog -p wa -k login +-w /var/log/tallylog -p wa -k login +# Network configuration +-w /etc/hosts -p wa -k audit_rules_networkconfig_modification +-w /etc/network/ -p wa -k audit_rules_networkconfig_modification +-w /etc/sysconfig/network -p wa -k audit_rules_networkconfig_modification +# System startup scripts +-w /etc/inittab -p wa -k init +-w /etc/init.d/ -p wa -k init +-w /etc/init/ -p wa -k init +# Library search paths +-w /etc/ld.so.conf -p wa -k libpath +# Local time zone +-w /etc/localtime -p wa -k localtime +# Time zone configuration +-w /etc/timezone -p wa -k audit_time_ruleszone +# Kernel parameters +-w /etc/sysctl.conf -p wa -k sysctl +# Modprobe configuration +-w /etc/modprobe.conf -p wa -k modprobe +-w /etc/modprobe.d/ -p wa -k modprobe +-w /etc/modules -p wa -k modprobe +# Module manipulations +-a always,exit -F arch=x86_64 -S init_module -S delete_module -F key=modules +-a always,exit -F arch=x86_64 -S init_module -F key=modules +-a always,exit -F arch=b32 -S init_module -S delete_module -F key=modules +-a always,exit -F arch=b32 -S init_module -F key=modules +# PAM configuration +-w /etc/pam.d/ -p wa -k pam +-w /etc/security/limits.conf -p wa -k pam +-w /etc/security/pam_env.conf -p wa -k pam +-w /etc/security/namespace.conf -p wa -k pam +-w /etc/security/namespace.init -p wa -k pam +# Postfix configuration +-w /etc/aliases -p wa -k mail +-w /etc/postfix/ -p wa -k mail +# SSH configuration +-w /etc/ssh/sshd_config -k sshd +# Changes to hostname +-a always,exit -F arch=x86_64 -S sethostname -S setdomainname -k audit_rules_networkconfig_modification +-a always,exit -F arch=b32 -S sethostname -S setdomainname -k audit_rules_networkconfig_modification +# Changes to issue +-w /etc/issue -p wa -k audit_rules_networkconfig_modification +-w /etc/issue.net -p wa -k audit_rules_networkconfig_modification +# Capture all unauthorized file accesses +-a always,exit -F arch=x86_64 -S creat -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=x86_64 -S creat -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=x86_64 -S openat -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=x86_64 -S openat -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=x86_64 -S open_by_handle_at -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=x86_64 -S open_by_handle_at -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=x86_64 -S truncate -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=x86_64 -S truncate -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=x86_64 -S ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=x86_64 -S ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=x86_64 -S open -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=x86_64 -S open -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=b32 -S open -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=b32 -S open -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=b32 -S creat -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=b32 -S creat -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=b32 -S openat -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=b32 -S openat -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=b32 -S open_by_handle_at -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=b32 -S open_by_handle_at -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=b32 -S truncate -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=b32 -S truncate -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=b32 -S ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -F key=access +-a always,exit -F arch=b32 -S ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -F key=access +# Monitor for use of process ID change (switching accounts) applications +-w /bin/su -p x -k actions +-w /usr/bin/sudo -p x -k actions +-w /etc/sudoers -p wa -k actions +-w /etc/sudoers.d -p wa -k actions +# Make the configuration immutable +-e 2 +EOF + +# Setup Apparmor +echo 'session optional pam_apparmor.so order=user,group,default' > /etc/pam.d/apparmor + +# Rsyslog enable log shipping to centralized syslog server +echo '*.* @@10.16.100.253:514' >> /etc/rsyslog.d/50-default.conf + +# Disable IPv6 in UFW +sed -i "/ipv6=/Id" /etc/default/ufw +echo "IPV6=no" | sudo tee -a /etc/default/ufw + +# Enable UFW firewall +ufw allow 22/tcp +ufw allow from 10.16.100.125 to any port 10050 proto tcp +ufw allow 12800:12801/tcp +ufw enable + +# Enable Services +systemctl enable auditd +systemctl enable apparmor +systemctl enable haveged +systemctl enable ssh +systemctl enable fail2ban +systemctl enable unattended-upgrades + +# Restart Services +systemctl daemon-reload +systemctl restart ssh +systemctl restart fail2ban +systemctl restart unattended-upgrades +systemctl restart apparmor +systemctl restart auditd +systemctl restart haveged +systemctl restart rsyslog + +# Setup SSH Host Keys +rm /etc/ssh/ssh_host_* +ssh-keygen -t ecdsa -b 521 -f /etc/ssh/ssh_host_ecdsa_key -N "" +ssh-keygen -t rsa -b 4096 -f /etc/ssh/ssh_host_rsa_key -N "" +ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -N "" +awk '$5 >= 3071' /etc/ssh/moduli > /etc/ssh/moduli.safe +mv /etc/ssh/moduli.safe /etc/ssh/moduli + +# GRUB enable swap and disable root recovery +echo 'GRUB_CMDLINE_LINUX="cgroup_enable=memory swapaccount=1"' >> /etc/default/grub +echo 'GRUB_DISABLE_RECOVERY="true"' >> /etc/default/grub + +# MOTD +cat <<-EOF > /etc/motd +######################################################################################################################## +# UNAUTHORIZED ACCESS TO THIS DEVICE IS PROHIBITED # +# You must have explicit, authorized permission to access or configure this device. # +# Unauthorized attempts and actions to access or use this system may result in civil and/or criminal penalties. # +# All activities performed on this device are logged and monitored. # +# Disconnect IMMEDIATELY if you are not an authorized user! # +######################################################################################################################## +EOF \ No newline at end of file