kdc: Move KDC to run in container

playbooks/ldap.yml

@@ -24,7 +24,6 @@
   roles:
     - base
     - ldap-server
-    - kdc
     - role: ldap_netdb
       when: ldap_master is defined
     - role: ldap_gravatar

playbooks/oci-node.yml

@@ -11,4 +11,4 @@
 
   roles:
     - base
-    - podman
+    - kdc

roles/kdc/files/kdc-container.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Kerberos KDC Container
+
+[Service]
+User=kdc
+EnvironmentFile=/etc/sysconfig/kdc-container
+ExecStart=/usr/bin/podman run --rm -p 127.0.0.1:8001:8000 --name kdc \
+    -e LDAP_BASEDN -e LDAP_BIND_PW -e KRB5_REALM -e KRB5_STASH_PW kdc
+ExecStop=/usr/bin/podman stop kdc
+KillMode=none
+
+[Install]
+WantedBy=multi-user.target

roles/kdc/handlers/main.yml

@@ -1,5 +1,17 @@
 ---
-- name: restart kdc
-  service:
-    name: krb5kdc
+- name: rebuild kdc-container
+  ansible.builtin.command:
+    argv:
+      - podman
+      - build
+      - -t
+      - kdc
+      - /usr/local/src/docker-kdc
+  become: true
+  become_user: kdc
+  notify: restart kdc-container
+
+- name: restart kdc-container
+  ansible.builtin.service:
+    name: kdc-container
     state: restarted

roles/kdc/meta/main.yml

@@ -1,4 +1,4 @@
 ---
 dependencies:
-  - {role: nginx/server}
-  - {role: gunicorn}
+  - {role: git}
+  - {role: podman}

roles/kdc/tasks/main.yml

@@ -1,87 +1,51 @@
 ---
-- name: install packages
-  package:
-    name: "{{ item }}"
-    state: installed
-  with_items:
-    - krb5-server
-    - krb5-server-ldap
-    - python-kdcproxy
+- name: create group
+  ansible.builtin.group:
+    name: kdc
 
-- name: create kerberos config
-  template:
-    dest: /var/kerberos/krb5kdc/kdc.conf
-    src: kdc.conf.j2
+- name: create user
+  ansible.builtin.user:
+    name: kdc
+    comment: Podman KDC
+    group: kdc
+    shell: /sbin/nologin
+
+- name: get container source
+  ansible.builtin.git:
+    dest: /usr/local/src/docker-kdc
+    repo: https://github.com/foo-sh/docker-kdc.git
+    update: false
+  notify: rebuild kdc-container
+
+- name: create service config
+  ansible.builtin.template:
+    dest: /etc/sysconfig/kdc-container
+    src: kdc-container.sysconfig.j2
     mode: 0600
     owner: root
     group: "{{ ansible_wheel }}"
-  notify: restart kdc
 
-- name: store kdc and kadmin ldap auth credentials
-  shell: "( echo '{{ kerberos_kdc_pass }}' ; echo '{{ kerberos_kdc_pass }}' ) | kdb5_ldap_util stashsrvpw uid=krb5kdc,cn={{ kerberos_realm }},ou=System,{{ ldap_basedn }} ; ( echo '{{ kerberos_kadmin_pass }}' ; echo '{{ kerberos_kadmin_pass }}' ) | kdb5_ldap_util stashsrvpw uid=krb5kadmin,cn={{ kerberos_realm }},ou=System,{{ ldap_basedn }}"
-  args:
-    creates: "/var/kerberos/krb5kdc/.k5.ldap.{{ kerberos_realm|lower() }}"
-  no_log: true
-
-- name: store kdc master key
-  shell: "echo '{{ kerberos_master_pass }}' | kdb5_util stash"
-  args:
-    creates: "/var/kerberos/krb5kdc/.k5.{{ kerberos_realm }}"
-  no_log: true
-
-- name: enable kerberos service
-  service:
-    name: krb5kdc
-    state: started
-    enabled: true
-
-- name: create kdcproxy group
-  group:
-    name: kdcproxy
-    system: true
-
-- name: create kdcproxy user
-  user:
-    name: kdcproxy
-    comment: KDC Proxy
-    group: kdcproxy
-    groups: gunicorn
-    home: /var/empty
-    shell: /sbin/nologin
-    system: true
-
-- name: add nginx to kdcproxy group
-  user:
-    name: nginx
-    groups: kdcproxy
-
-- name: create kdcproxy config
-  template:
-    dest: /etc/kdcproxy.conf
-    src: kdcproxy.conf.j2
+- name: create service file
+  ansible.builtin.copy:
+    dest: /etc/systemd/system/kdc-container.service
+    src: kdc-container.service
     mode: 0644
     owner: root
     group: "{{ ansible_wheel }}"
 
-- name: create kdcproxy socket file
-  copy:
-    dest: /lib/systemd/system/gunicorn@kdcproxy.socket
-    src: /lib/systemd/system/gunicorn@.socket
-    mode: 0644
-    owner: root
-    group: "{{ ansible_wheel }}"
-    remote_src: true
-
-- name: enable kdcproxy socket
-  systemd:
-    name: gunicorn@kdcproxy.socket
-    enabled: true
+- name: enable service
+  ansible.builtin.service:
+    name: kdc-container
     state: started
+    enabled: true
 
-- name: create kdcproxy config for nginx
-  template:
-    dest: "/etc/nginx/conf.d/{{ inventory_hostname }}/kdcproxy.conf"
-    src: nginx-kdcproxy.conf.j2
+- name: copy nginx config
+  ansible.builtin.copy:
+    dest: /etc/nginx/conf.d/{{ inventory_hostname }}/kdc-container.conf
+    content: |
+      location /kdcProxy {
+        proxy_pass http://localhost:8001;
+      }             
     mode: 0644
     owner: root
     group: "{{ ansible_wheel }}"

roles/kdc/templates/kdc-container.sysconfig.j2

@@ -0,0 +1,4 @@
+LDAP_BASEDN="{{ ldap_basedn }}"
+LDAP_BIND_PW="{{ kerberos_kdc_pass }}"
+KRB5_REALM="{{ kerberos_realm }}"
+KRB5_STASH_PW="{{ kerberos_master_pass }}"

roles/kdc/templates/kdc.conf.j2

@@ -1,33 +0,0 @@
-[libdefaults]
-  default_realm = {{ kerberos_realm }}
-
-[logging]
-  kdc = SYSLOG
-  admin_server = SYSLOG
-
-[kdcdefaults]
-  # listen on localhost only
-  kdc_listen = 127.0.0.1:88
-  kdc_tcp_listen = 127.0.0.1:88
-
-[realms]
-  {{ kerberos_realm }} = {
-    database_module = ldap.{{ kerberos_realm|lower() }}
-    key_stash_file = "/var/kerberos/krb5kdc/.k5.{{ kerberos_realm }}"
-    max_lifetime = 24h 0m 0s
-    max_renewable_life = 7d 0h 0m 0s
-    master_key_type = aes256-cts-hmac-sha1-96
-    supported_enctypes = aes256-cts-hmac-sha1-96:normal
-  }
-
-[dbmodules]
-  ldap.{{ kerberos_realm|lower() }} = {
-    db_library = kldap
-    disable_last_success = true
-    disable_lockout  = true
-    ldap_kerberos_container_dn = "ou=System,{{ ldap_basedn }}"
-    ldap_kdc_dn = "uid=krb5kdc,cn={{ kerberos_realm }},ou=System,{{ ldap_basedn }}"
-    ldap_kadmind_dn = "uid=krb5kadmin,cn={{ kerberos_realm }},ou=System,{{ ldap_basedn }}"
-    ldap_service_password_file = "/var/kerberos/krb5kdc/.k5.ldap.{{ kerberos_realm|lower() }}"
-    ldap_servers = "{% for item in ldap_server %}ldaps://{{ item }} {% endfor %}"
-  }

roles/kdc/templates/kdcproxy.conf.j2

@@ -1,4 +0,0 @@
-[global]
-
-[{{ kerberos_realm }}]
-kerberos = kerberos+tcp://localhost

roles/kdc/templates/nginx-kdcproxy.conf.j2

@@ -1,3 +0,0 @@
-location /KdcProxy {
-    proxy_pass http://unix:/run/gunicorn/gunicorn-kdcproxy.sock:/KdcProxy;
-}