roles/samba-dc: Deploy a Samba AD DC

The *samba-dc* role installs Samba on the managed node and configures it
as an Active Directory Domain controller. A custom module,
`samba_domain` handles the provisioning using `samba-tool domain
provision` in an idempotent way.

roles/samba-dc/defaults/main.yml

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+samba_dc_use_rfc2307: true

roles/samba-dc/handlers/main.yml

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+- name: restore samba file contexts
+  command: restorecon -RF /var/lib/samba
+- name: display generated admin password
+  debug:
+    var=samba_dc_provision.admin_password
+- name: save firewalld configuration
+  command: firewall-cmd --runtime-to-permanent

roles/samba-dc/library/samba_domain

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+# vim: set ft=python :
+import errno
+import os
+import subprocess
+
+
+def get_samba_paths(samba='samba'):
+    lines = []
+    paths = {}
+    cmd = [samba, '--show-build']
+    with open(os.devnull, 'r') as nul:
+        p = subprocess.Popen(
+            cmd, stdin=nul, stdout=subprocess.PIPE, stderr=subprocess.PIPE
+        )
+        out, err = p.communicate()
+        in_paths = False
+        for line in out.splitlines():
+            out += line
+            if line.startswith(b'Paths:'):
+                in_paths = True
+                continue
+            if in_paths:
+                if line.startswith(b'   '):
+                    parts = line.decode().split(':', 1)
+                    if len(parts) != 2:
+                        raise ValueError(
+                            'Unexpected output from samba: {}'.format(line)
+                        )
+                    paths[parts[0].strip()] = parts[1].strip()
+                else:
+                    in_paths = False
+        if p.returncode != 0:
+            raise subprocess.CalledProcessError(p.returncode, cmd, out, err)
+        return paths
+
+
+def main():
+    module = AnsibleModule(
+        argument_spec=dict(
+            realm=dict(
+                required=True,
+            ),
+            domain=dict(
+                required=False,
+            ),
+            use_rfc2307=dict(
+                required=False,
+                type='bool',
+                default=True,
+            ),
+            dns_backend=dict(
+                required=False,
+                choices=[
+                    'BIND9_DLZ',
+                    'SAMBA_INTERNAL',
+                ],
+            ),
+        ),
+        supports_check_mode=True,
+    )
+
+    realm = module.params['realm']
+    domain = module.params['domain'] or realm.split('.')[0]
+    use_rfc2307 = module.params['use_rfc2307']
+    dns_backend = module.params['dns_backend']
+
+    samba_tool = module.get_bin_path('samba-tool', required=True)
+    samba = module.get_bin_path('samba', required=True)
+
+    try:
+        samba_paths = get_samba_paths(samba)
+    except OSError as e:
+        module.fail_json(msg='Error running samba: {}'.format(e))
+    except subprocess.CalledProcessError as e:
+        module.fail_json(
+            msg='Error running samba: {}'.format(e),
+            stdout=e.stdout,
+            stderr=e.stderr,
+        )
+
+    changed = not os.path.isdir(os.path.join(
+        samba_paths['STATEDIR'],
+        'sysvol',
+        realm.lower(),
+    ))
+
+    if changed and not module.check_mode:
+        try:
+            os.unlink(samba_paths['CONFIGFILE'])
+        except OSError as e:
+            if e.errno != errno.ENOENT:
+                raise
+        cmd = [
+            samba_tool,
+            'domain',
+            'provision',
+            '--realm={}'.format(realm),
+            '--domain={}'.format(domain),
+        ]
+        if use_rfc2307:
+            cmd.append('--use-rfc2307')
+        if dns_backend:
+            cmd += ('--dns-backend', dns_backend)
+        rc, out, err = module.run_command(cmd, check_rc=True)
+        admin_password = ''
+        domain_sid = ''
+        for line in err.splitlines():
+            if line.startswith('Admin password:'):
+                admin_password = line.split(':', 1)[1].lstrip()
+            if line.startswith('DOMAIN SID:'):
+                domain_sid = line.split(':', 1)[1].lstrip()
+        module.exit_json(
+            changed=True,
+            rc=rc,
+            admin_password=admin_password,
+            domain_sid=domain_sid,
+        )
+
+    module.exit_json(changed=changed)
+
+
+from ansible.module_utils.basic import *
+if __name__ == '__main__':
+    main()

roles/samba-dc/tasks/main.yml

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+- name: load distribution-specific values
+  include_vars: '{{ item }}'
+  with_first_found:
+  - '{{ ansible_distribution }}.yml'
+  - defaults.yml
+  tags:
+  - always
+
+- name: ensure packages are installed
+  package:
+    name={{ samba_dc_packages|join(',') }}
+    state=present
+  tags:
+  - install
+
+- name: ensure selinux file contexts are correct
+  sefcontext:
+    target={{ item.path }}
+    setype={{ item.setype }}
+    state=present
+  with_items: '{{ samba_selinux_contexts }}'
+  notify: restore samba file contexts
+
+- name: ensure kerberos is configured
+  template:
+    src=krb5.conf.j2
+    dest=/etc/krb5.conf.d/samba.conf
+
+- name: ensure domain is provisioned
+  samba_domain:
+    realm={{ krb5_realm }}
+    domain={{ netbios_domain|d(omit) }}
+    use_rfc2307={{ samba_dc_use_rfc2307 }}
+    dns_backend={{ samba_dc_dns_backend|d(omit) }}
+  register: samba_dc_provision
+  notify:
+  - restore samba file contexts
+  - display generated admin password
+
+- name: ensure samba starts at boot
+  service:
+    name=samba
+    enabled=yes
+- name: ensure samba is running
+  service:
+    name=samba
+    state=started
+
+- name: ensure firewall is configured for samba
+  firewalld:
+    service={{ item if '/' not in item else omit }}
+    port={{ item if '/' in item else omit }}
+    state=enabled
+    permanent=no
+    immediate=yes
+  with_items: '{{ samba_firewall }}'
+  notify: save firewalld configuration
+  when: host_users_firewalld|d(true)|bool
+  tags:
+  - firewalld

roles/samba-dc/templates/krb5.conf.j2

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+[libdefaults]
+default_realm = {{ krb5_realm }}
+dns_lookup_realm = false
+dns_lookup_kdc = true

roles/samba-dc/vars/defaults.yml

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+samba_dc_packages:
+- krb5-workstation
+- openldap-clients
+- samba-dc
+- samba-dc-bind-dlz
+- samba-winbind-clients
+- tdb-tools

roles/samba-dc/vars/main.yml

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+samba_selinux_contexts:
+- path: /var/lib/samba/bind-dns/dns.keytab
+  setype: named_conf_t
+- path: /var/lib/samba/bind-dns/named.conf.*
+  setype: named_conf_t
+- path: /var/lib/samba/bind-dns/dns(/.*)?
+  setype: named_var_run_t
+samba_firewall:
+- dns
+- kerberos
+- 135/tcp
+- ldap
+- 389/udp
+- samba
+- kpasswd
+- ldaps
+- 3268/tcp
+- 3269/tcp
+- 49152-65535/tcp