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more fiddling with ssh security now relying on mozilla recommendations

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This commit is contained in:
Timo Makinen 2019-05-28 20:30:03 +03:00
parent 180dae44a4
commit faaddffce4
1 changed files with 11 additions and 10 deletions
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21
roles/base/tasks/main.yml
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@ -14,16 +14,15 @@
owner: root owner: root
group: "{{ ansible_wheel }}" group: "{{ ansible_wheel }}"
# use openbsd kex algorithms but drop ssh-audit errors # use mozilla recommended settings (only prefer aes256 over chacha20)
# https://infosec.mozilla.org/guidelines/openssh.html
- name: tighten sshd kex algorithms - name: tighten sshd kex algorithms
lineinfile: lineinfile:
path: /etc/ssh/sshd_config path: /etc/ssh/sshd_config
line: "KexAlgorithms curve25519-sha256,curve25519-sha256@libssh.org,\ line: "KexAlgorithms curve25519-sha256@libssh.org,\
diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,\ diffie-hellman-group-exchange-sha256"
diffie-hellman-group14-sha256"
regexp: "^KexAlgorithms .*" regexp: "^KexAlgorithms .*"
notify: restart sshd notify: restart sshd
# use openbsd ciphers but in mozilla recommended order (kind of)
- name: tighten sshd ciphers - name: tighten sshd ciphers
lineinfile: lineinfile:
path: /etc/ssh/sshd_config path: /etc/ssh/sshd_config
@ -31,30 +30,32 @@
aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr" aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr"
regexp: "^Ciphers .*" regexp: "^Ciphers .*"
notify: restart sshd notify: restart sshd
# use openbsd macs but drop ssh-audit errors
- name: tighten sshd macs - name: tighten sshd macs
lineinfile: lineinfile:
path: /etc/ssh/sshd_config path: /etc/ssh/sshd_config
line: "MACs hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com" line: "MACs hmac-sha2-512-etm@openssh.com,\
hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com,\
hmac-sha2-512,hmac-sha2-256,umac-128@openssh.com"
regexp: "^MACs .*" regexp: "^MACs .*"
notify: restart sshd notify: restart sshd
- name: disable ecdsa key from sshd - name: disable ecdsa key from sshd
lineinfile: lineinfile:
path: /etc/ssh/sshd_config path: /etc/ssh/sshd_config
line: "#HostKey /etc/ssh/ssh_host_ecdsa_key" line: "#HostKey /etc/ssh/ssh_host_ecdsa_key"
regexp: "HostKey /etc/ssh/ssh_host_ecdsa_key" regexp: "^#?HostKey /etc/ssh/ssh_host_ecdsa_key"
notify: restart sshd notify: restart sshd
- name: enable rsa key from sshd - name: enable rsa key from sshd
lineinfile: lineinfile:
path: /etc/ssh/sshd_config path: /etc/ssh/sshd_config
line: "HostKey /etc/ssh/ssh_host_rsa_key" line: "HostKey /etc/ssh/ssh_host_rsa_key"
regexp: "#?HostKey /etc/ssh/ssh_host_rsa_key" regexp: "^#?HostKey /etc/ssh/ssh_host_rsa_key"
notify: restart sshd notify: restart sshd
- name: enable ed25519 key from sshd - name: enable ed25519 key from sshd
lineinfile: lineinfile:
path: /etc/ssh/sshd_config path: /etc/ssh/sshd_config
line: "HostKey /etc/ssh/ssh_host_ed25519_key" line: "HostKey /etc/ssh/ssh_host_ed25519_key"
regexp: "#?HostKey /etc/ssh/ssh_host_ed25519_key" regexp: "^#?HostKey /etc/ssh/ssh_host_ed25519_key"
notify: restart sshd notify: restart sshd
- name: install basic roles - name: install basic roles