update..

roles/common/tasks/nis-install-server.yml

@@ -37,6 +37,48 @@
     - nis-install-client
 
 
+# ---
+# Since Debian 11 (bullseye) password hashing uses 'yescrypt' by default. 
+#
+# Note:
+#    'yescrypt' is not supported by Debian 10 (buster) nor by Ubuntu 18.04 and smaller
+#
+# ---
+
+- name: (nis-install-server.yml) Check if file '/etc/pam.d/common-password' exists 
+  stat:
+    path: /etc/pam.d/common-password
+  register: file_etc_pam_d_common_password
+  tags:
+    - nis-install
+    - nis-install-server
+  when:
+    - ansible_facts['distribution'] == "Debian"
+    - ansible_facts['distribution_major_version']|int >= 11
+
+- name: (nis-install-server.yml) Check if default hash for password is 'yescrypt'
+  shell: "grep -i -q -E  '^password.+yescrypt' /etc/pam.d/common-password"
+  register: presence_of_passwprd_hashing_yescrypt
+  changed_when: 
+    - presence_of_passwprd_hashing_yescrypt.rc < 1
+  failed_when:
+    - presence_of_passwprd_hashing_yescrypt.rc >= 2
+  when:
+    - ansible_facts['distribution'] == "Debian"
+    - ansible_distribution_major_version|int >= 11
+    - ansible_distribution_major_version|int <= 12
+    - file_etc_pam_d_common_password.stat.exists == True
+
+- name: (nis-install-server.yml) Change default password hash for local system accounts from SHA-512 to yescrypt
+  shell: perl -i -n -p -e "s/^(password.+)yescrypt/\1sha512/" /etc/pam.d/common-password
+  when:
+    - ansible_facts['distribution'] == "Debian"
+    - ansible_facts['distribution_major_version']|int >= 11
+    - ansible_facts['distribution_major_version']|int <= 12
+    - file_etc_pam_d_common_password.stat.exists == True
+    - presence_of_passwprd_hashing_yescrypt is changed
+
+
 # ---
 # /etc/default/nis
 # ---