Add playbook to run on controller node

ansible/controller-playbook.yml

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+---
+- hosts: 127.0.0.1
+  connection: local
+

ansible/group_vars/all/vars.yml

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+ssh_users:
+  agrabeli:
+    login: agrabeli
+    comment: Maria Xynou
+    keys: ["ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDD0JSwM+t3Uz9lS3Mjoz9oo4vOToWyzboZhYQbP8JY5HvFtAvWanWHnUBO91t6hkgKIMiUqhdCJn26fqkhSGe/bRBaFUocOmuyfcmZoRdi0qzAskmycJsj/w6vWR4x6MYkmJvSeI/MGxjEFt4s2MfOG1tP8CBLUYft9qUleeJa7Jln8c+xbnqB7YngaI190icQHE9NuIB2CXvzbmo3tLtHNMagEwI7VoBDj6mxzTxBd9JhuhF4w5uGxxm0Gp1hzk+15obNnaBS+Anr7jXz8FPwwxCH+XhBZxB1PPpcIayKrf9iLyGtwmhkdDoWCqYAr1mue3LxFso+TZF4bwE4Cjt1 agrabelh@agrabelh"]
+  art:
+    login: art
+    comment: Arturo Filasto
+    keys: ["ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJsibU0nsQFFIdolD1POzXOws4VetV0ZNByINRzY8Hx0 [email protected]"]
+  majakomel:
+    login: majakomel
+    comment: Maja Komel
+    keys:
+      - "ssh-rsa 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"
+  mehul:
+    login: mehul
+    comment: Mehul Gulati
+    keys:
+      - "ssh-rsa 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"
+
+admin_usernames: [ art, majakomel, mehul ]
+non_admin_usernames: [ agrabeli ]

ansible/roles/user_setup/tasks/main.yml

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+---
+- name: create admin users
+  tags: ssh_users
+  user:
+    name: "{{ item }}"
+    group: "admin"
+    comment: "{{ ssh_users[item].comment }}"
+    shell: /bin/bash
+    state: present
+  with_items: "{{ admin_usernames }}"
+
+- name: create non-admin users
+  tags: ssh_users
+  user:
+    name: "{{ item }}"
+    group: "{{ item }}"
+    comment: "{{ ssh_users[item].comment }}"
+    shell: /bin/bash
+    state: present
+  with_items: "{{ non_admin_usernames }}"
+
+- name: create .ssh dir in user homes
+  tags: ssh_users
+  file: path=/home/{{item}}/.ssh state=directory owner={{item}} group={{item}} mode=0700
+  with_items: "{{ admin_usernames | union(non_admin_usernames) }}"
+
+- name: create .ssh/authorized_keys for each user
+  tags: ssh_users
+  template: src=authorized_keys dest=/home/{{item}}/.ssh/authorized_keys owner={{item}} group={{item}} mode=0400
+  with_items: "{{ admin_usernames | union(non_admin_usernames) }}"
+
+- name: list all users currently on the system
+  shell: "getent passwd | awk -F: '$3 > 1000 {print $1}'"
+  register: user_list
+
+- name: remove any stale users
+  user:
+    name: "{{ item }}"
+    state: "absent"
+    remove: "yes"
+  with_items: user_list.stdout_lines
+  when: "item is not nobody and item not in admin_usernames | union(non_admin_usernames)"

ansible/roles/user_setup/templates/authorized_keys

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+# managed by ansible
+# see roles/adm/templates/authorized_keys
+{% for k in passwd[item]['keys'] %}
+{{ k }}
+{% endfor %}

ansible/roles/user_setup/templates/authorized_keys_ubuntu

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+# ansible-managed in ooni-sysadmin.git
+{% for login in adm_logins %}
+{% for k in passwd[login]['keys'] %}
+{{ k }}
+{% endfor %}
+{% endfor %}