sshd: Move ssh deamon configuration to own role

roles/base/tasks/main.yml

@@ -25,50 +25,6 @@
     owner: root
     group: "{{ ansible_wheel }}"
 
-# use mozilla recommended settings (only prefer aes256 over chacha20)
-# https://infosec.mozilla.org/guidelines/openssh.html
-- name: tighten sshd kex algorithms
-  lineinfile:
-    path: /etc/ssh/sshd_config
-    line: "KexAlgorithms curve25519-sha256@libssh.org,\
-     diffie-hellman-group-exchange-sha256"
-    regexp: "^KexAlgorithms .*"
-  notify: restart sshd
-- name: tighten sshd ciphers
-  lineinfile:
-    path: /etc/ssh/sshd_config
-    line: "Ciphers aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,\
-     aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr"
-    regexp: "^Ciphers .*"
-  notify: restart sshd
-- name: tighten sshd macs
-  lineinfile:
-    path: /etc/ssh/sshd_config
-    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 .*"
-  notify: restart sshd
-
-- name: disable ecdsa key from sshd
-  lineinfile:
-    path: /etc/ssh/sshd_config
-    line: "#HostKey /etc/ssh/ssh_host_ecdsa_key"
-    regexp: "^#?HostKey /etc/ssh/ssh_host_ecdsa_key"
-  notify: restart sshd
-- name: disable rsa key from sshd
-  lineinfile:
-    path: /etc/ssh/sshd_config
-    line: "#HostKey /etc/ssh/ssh_host_rsa_key"
-    regexp: "^#?HostKey /etc/ssh/ssh_host_rsa_key"
-  notify: restart sshd
-- name: enable ed25519 key from sshd
-  lineinfile:
-    path: /etc/ssh/sshd_config
-    line: "HostKey /etc/ssh/ssh_host_ed25519_key"
-    regexp: "^#?HostKey /etc/ssh/ssh_host_ed25519_key"
-  notify: restart sshd
-
 - name: install basic roles
   include_role:
     name: "{{ role }}"
@@ -76,5 +32,6 @@
     - network
     - pki
     - psacct
+    - sshd
   loop_control:
     loop_var: role

roles/sshd/handlers/main.yml

@@ -0,0 +1,5 @@
+---
+- name: restart sshd
+  service:
+    name: sshd
+    state: restarted

roles/sshd/tasks/main.yml

@@ -0,0 +1,60 @@
+---
+
+# based on mozilla recommended settings
+#   https://infosec.mozilla.org/guidelines/openssh.html
+#
+#   * prefer aes over chacha for hardware acceleration
+#   * use only ed25519 host key
+#
+
+- name: tighten ssh kex algorithm
+  lineinfile:
+    path: /etc/ssh/sshd_config
+    line: "KexAlgorithms curve25519-sha256@libssh.org,\
+     diffie-hellman-group-exchange-sha256"
+    regexp: "^KexAlgorithms .*"
+    validate: "sshd -t -f %s"
+  notify: restart sshd
+
+- name: tighten sshd ciphers
+  lineinfile:
+    path: /etc/ssh/sshd_config
+    line: "Ciphers aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,\
+     aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr"
+    regexp: "^Ciphers .*"
+    validate: "sshd -t -f %s"
+  notify: restart sshd
+
+- name: tighten sshd macs
+  lineinfile:
+    path: /etc/ssh/sshd_config
+    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 .*"
+    validate: "sshd -t -f %s"
+  notify: restart sshd
+
+- name: disable ecdsa key from sshd
+  lineinfile:
+    path: /etc/ssh/sshd_config
+    line: "#HostKey /etc/ssh/ssh_host_ecdsa_key"
+    regexp: "^#?HostKey /etc/ssh/ssh_host_ecdsa_key"
+    validate: "sshd -t -f %s"
+  notify: restart sshd
+
+- name: disable rsa key from sshd
+  lineinfile:
+    path: /etc/ssh/sshd_config
+    line: "#HostKey /etc/ssh/ssh_host_rsa_key"
+    regexp: "^#?HostKey /etc/ssh/ssh_host_rsa_key"
+    validate: "sshd -t -f %s"
+  notify: restart sshd
+
+- name: enable ed25519 key from sshd
+  lineinfile:
+    path: /etc/ssh/sshd_config
+    line: "HostKey /etc/ssh/ssh_host_ed25519_key"
+    regexp: "^#?HostKey /etc/ssh/ssh_host_ed25519_key"
+    validate: "sshd -t -f %s"
+  notify: restart sshd