Better hardening-basic role
This commit is contained in:
Claudio Maradonna
parent
25f404da4e
commit
6a875bc851
GPG key ID:
0CBA58694C5680D9
7 changed files with 168 additions and 79 deletions
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@ -13,8 +13,10 @@
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- role: iptables-ipfs
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tags: [firewall, ipfs]
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- fail2ban-basic
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- hardening-basic
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- role: fail2ban-basic
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tags: [hardening]
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- role: hardening-basic
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tags: [hardening]
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- yggdrasil
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- role: snort-community
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tags: snort
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@ -2,11 +2,15 @@
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# defaults file for hardening-basic
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hardening_sshd_enabled: true
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hardening_sshd_port: 22
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hardening_sshd_authorized_key_file: .ssh/authorized_keys
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hardening_sshd_tcp_forward: false
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hardening_sshd_legal_banner: false
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hardening_sshd_permissions_set_sticky_bit: true
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hardening_modprobe_files:
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- /etc/modprobe.d/disable-network-filesystems.conf
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- /etc/modprobe.d/disable-rare-filesystems.conf
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- /etc/modprobe.d/disable-rare-protocols.conf
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- /etc/modprobe.d/disable-vivid.conf
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hardening_modprobe_disable_list:
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ipv6: [ipv6]
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network_filesystems: [cifs,nfs,nfsv3,nfsv4,gfs2]
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rare_filesystems: [cramfs,freevxfs,jffs2,hfs,hfsplus,squashfs,udf]
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rare_protocols: [dccp,sctp,rds,tipc,n-hdlc,ax25,netrom,x25,rose,decnet,econet,af_802154,ipx,appletalk,psnap,p8023,p8022,can,atm]
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vivid: [vivid]
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@ -3,27 +3,16 @@
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- name: Basic Hardening
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block:
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- name: Create and copy hardening files
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ansible.builtin.template:
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src: '{{ item.src }}'
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dest: '/etc/{{ item.path }}'
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with_community.general.filetree: '../templates/etc/'
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when: item.state == 'file'
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- name: Harden SSH Config
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when: 'hardening_sshd_enabled is true'
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block:
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- name: Check if sshd_config/99-hardening exists
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stat:
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path: /etc/ssh/sshd_config.d/99-hardening.conf
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register: file_name
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- name: Download sshd_config
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when: not file_name.stat.exists
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ansible.builtin.get_url:
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url: https://git.unitoo.it/unitoo/configurations/raw/branch/master/ssh/etc/ssh/sshd_config
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dest: /etc/ssh/sshd_config.d/99-hardening.conf
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- name: Enable TCP SSH Forwarding
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when: 'hardening_sshd_tcp_forward is true'
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replace:
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path: /etc/ssh/sshd_config.d/99-hardening.conf
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regexp: 'AllowTcpForwarding no'
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replace: 'AllowTcpForwarding yes'
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backup: yes
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- name: Give 1700 permissions to .ssh folder
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ansible.builtin.file:
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@ -44,30 +33,3 @@
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ansible.builtin.systemd:
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state: restarted
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name: sshd
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- name: Create if not exists /etc/modprobe.d
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file:
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path: /etc/modprobe.d
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state: directory
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- name: modprobe.d setup
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include_tasks: modprobe.yml
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loop: "{{ hardening_modprobe_files }}"
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loop_control:
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loop_var: file
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- name: Create if not exists /etc/sysctl.d
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file:
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path: /etc/sysctl.d
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state: directory
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- name: Check if sysctl/99-hardening exists
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stat:
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path: /etc/sysctl.d/99-hardening.conf
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register: file_name
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- name: Download sysctl.conf
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when: not file_name.stat.exists
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ansible.builtin.get_url:
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url: https://git.unitoo.it/unitoo/configurations/raw/branch/master/sysctl/etc/sysctl.conf
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dest: /etc/sysctl.d/99-hardening.conf
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@ -1,10 +0,0 @@
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- name: Check if {{ file }} exists
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stat:
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path: "{{ file }}"
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register: file_name
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- name: Download {{ file }}
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when: not file_name.stat.exists
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ansible.builtin.get_url:
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url: "https://git.unitoo.it/unitoo/configurations/raw/branch/master/modprobe/{{file}}"
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dest: "{{ file }}"
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@ -0,0 +1,7 @@
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{% for section in hardening_modprobe_disable_list %}
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# Disable for {{ section }}
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{% for item in hardening_modprobe_disable_list[section] %}
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install {{ item }} /bin/false
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{% endfor %}
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{% endfor %}
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@ -0,0 +1,58 @@
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{% if hardening_sshd_enabled %}
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Protocol 2 # Protocol 1 is fundamentally broken
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StrictModes yes # Protects from misconfiguration
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#ListenAddress [ip-here] # Listening address
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Port {{ hardening_sshd_port }} # Listening port. Normal 22
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AuthenticationMethods publickey # Only public key authentication allowed
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AuthorizedKeysFile {{ hardening_sshd_authorized_key_file }}
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PubkeyAuthentication yes # Allow public key authentication
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HostKey /etc/ssh/ssh_host_ed25519_key # Only allow ECDSA pubic key authentication
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HostKeyAlgorithms ssh-ed25519-cert-v01@openssh.com,ssh-ed25519 # Host keys the client should accepts
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KexAlgorithms curve25519-sha256 # Specifies the available KEX (Key Exchange) algorithms
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Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com # Specifies the ciphers allowed
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MACs hmac-sha2-512-etm@openssh.com # Specifies the available MAC alg.
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#Only allow incoming ECDSA and ed25519 sessions:
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HostbasedAcceptedKeyTypes ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519
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PubkeyAcceptedKeyTypes sk-ecdsa-sha2-nistp256@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,ssh-ed25519
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#CASignatureAlgorithms ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519
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PermitRootLogin WITHOUT-PASSWORD # Enable/disable root login
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#AllowUsers [username] # Authorized SSH users are inside the admin group
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MaxAuthTries 5 # Maximum allowed authentication attempts
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MaxSessions 2 # Maximum allowed sessions by the user
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PasswordAuthentication no # No username password authentication
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PermitEmptyPasswords no # No empty password authentcation allowed
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IgnoreRhosts yes # Dont read users rhost files
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HostbasedAuthentication no # Disable host-based authentication
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ChallengeResponseAuthentication no # Unused authentication scheme
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X11Forwarding no # Disable X11 forwarding
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LogLevel VERBOSE # Fingerprint details of failed login attempts
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SyslogFacility AUTH # Logging authentication and authorization related commands
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UseDNS no # Client from a location without proper DNS generate a warning in the logs
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PermitTunnel no # Only SSH connection and nothing else
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AllowTcpForwarding {{ 'yes' if hardening_sshd_tcp_forward else 'no' }} # Disablow tunneling out via SSH
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AllowStreamLocalForwarding no # Disablow tunneling out via SSH
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GatewayPorts no # Disablow tunneling out via SSH
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AllowAgentForwarding no # Do not allow agent forwarding
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{% if hardening_sshd_legal_banner %}
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Banner /etc/issue.net # Show legal login banner
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{% endif %}
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PrintLastLog yes # Show last login
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ClientAliveInterval 900 # Client timeout (15 minutes)
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ClientAliveCountMax 0 # This way enforces timeouts on the server side
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LoginGraceTime 30 # Authenticatin must happen within 30 seconds
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MaxStartups 2 # Max concurrent SSH sessions
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TCPKeepAlive yes # Do not use TCP keep-alive
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AcceptEnv LANG LC_* # Allow client to pass locale environment variables
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{% endif %}
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@ -0,0 +1,66 @@
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# Hardened sysctl conf
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fs.protected_regular = 2
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fs.protected_fifos = 2
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fs.protected_hardlinks = 1
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fs.protected_symlinks = 1
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fs.suid_dumpable = 0
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kernel.core_uses_pid = 1
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kernel.ctrl-alt-del = 0
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kernel.dmesg_restrict = 1
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kernel.kptr_restrict = 2
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kernel.randomize_va_space = 2
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kernel.sysrq = 0
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kernel.unprivileged_bpf_disabled = 1
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net.core.bpf_jit_harden = 2
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net.ipv4.conf.all.accept_redirects = 0
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net.ipv4.conf.all.accept_source_route = 0
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net.ipv4.conf.all.bootp_relay = 0
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net.ipv4.conf.all.forwarding = 0
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net.ipv4.conf.all.log_martians = 1
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net.ipv4.conf.all.mc_forwarding = 0
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net.ipv4.conf.all.proxy_arp = 0
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net.ipv4.conf.all.rp_filter = 1
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net.ipv4.conf.all.send_redirects = 0
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net.ipv4.conf.all.secure_redirects=0
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net.ipv4.tcp_rfc1337=1
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net.ipv4.tcp_sack=0
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net.ipv4.tcp_dsack=0
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net.ipv4.tcp_fack=0
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net.ipv4.conf.default.accept_redirects = 0
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net.ipv4.conf.default.accept_source_route = 0
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net.ipv4.conf.default.log_martians = 1
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net.ipv4.conf.default.rp_filter=1
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net.ipv4.conf.default.send_redirects=0
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net.ipv4.conf.default.secure_redirects=0
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net.ipv4.icmp_echo_ignore_broadcasts = 1
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net.ipv4.icmp_ignore_bogus_error_responses = 1
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net.ipv4.tcp_syncookies = 1
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net.ipv4.tcp_timestamps = 1
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dev.tty.ldisc_autoload=0
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vm.unprivileged_userfaultfd=0
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kernel.kexec_load_disabled=1
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kernel.perf_event_paranoid=2
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kernel.yama.ptrace_scope=2
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vm.mmap_rnd_bits=32
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vm.mmap_rnd_compat_bits=16
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# Uncomment do disable ipv6
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#net.ipv6.conf.all.disable_ipv6=1
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#net.ipv6.conf.default.disable_ipv6=1
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#net.ipv6.conf.lo.disable_ipv6=1
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net.ipv6.conf.all.accept_redirects = 0
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net.ipv6.conf.all.accept_source_route = 0
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net.ipv6.conf.default.accept_redirects = 0
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net.ipv6.conf.default.accept_source_route = 0
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vm.swappiness = 15
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