From 30eff2fb90b93e30b51f98662fbc3bda5e9131d4 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Sun, 1 Oct 2023 20:28:56 +0200
Subject: add role for nginx-sso

---
 roles/nginx/auth/sso/backend/defaults/main.yml     | 37 ++++++++++++++++++++++
 roles/nginx/auth/sso/backend/handlers/main.yml     | 12 +++++++
 roles/nginx/auth/sso/backend/tasks/main.yml        | 37 ++++++++++++++++++++++
 .../sso/backend/templates/nginx-sso@.service.j2    | 31 ++++++++++++++++++
 roles/nginx/auth/sso/base/defaults/main.yml        |  7 ++++
 roles/nginx/auth/sso/base/tasks/main.yml           |  6 ++++
 .../nginx/auth/sso/base/templates/nginx.snippet.j2 | 23 ++++++++++++++
 7 files changed, 153 insertions(+)
 create mode 100644 roles/nginx/auth/sso/backend/defaults/main.yml
 create mode 100644 roles/nginx/auth/sso/backend/handlers/main.yml
 create mode 100644 roles/nginx/auth/sso/backend/tasks/main.yml
 create mode 100644 roles/nginx/auth/sso/backend/templates/nginx-sso@.service.j2
 create mode 100644 roles/nginx/auth/sso/base/defaults/main.yml
 create mode 100644 roles/nginx/auth/sso/base/tasks/main.yml
 create mode 100644 roles/nginx/auth/sso/base/templates/nginx.snippet.j2

(limited to 'roles/nginx')

diff --git a/roles/nginx/auth/sso/backend/defaults/main.yml b/roles/nginx/auth/sso/backend/defaults/main.yml
new file mode 100644
index 00000000..d1928f77
--- /dev/null
+++ b/roles/nginx/auth/sso/backend/defaults/main.yml
@@ -0,0 +1,37 @@
+---
+# nginx_sso_backend_configs:
+#   example:
+#     login:
+#       title: "example.com - Login"
+#       default_method: "simple"
+#       hide_mfa_field: true
+#       names:
+#         simple: "Username / Password"
+#     cookie:
+#       domain: ".example.com"
+#       authentication_key: "very-very-secret"
+#       prefix: nginx-sso-example
+#       secure: yes
+#       expire: 3600
+#     listen:
+#       addr: "0.0.0.0"
+#       port: 8082
+#     audit_log:
+#       targets:
+#       - fd://stdout
+#       events: ['access_denied', 'login_success', 'login_failure', 'logout', 'validate']
+#       headers: ['x-origin-uri']
+#       trusted_ip_headers: ["X-Forwarded-For", "RemoteAddr", "X-Real-IP"]
+#     acl:
+#       rule_sets:
+#       - rules:
+#         - field: "x-host"
+#           regexp: ".*"
+#         allow: ["@_authenticated"]
+#     providers:
+#       simple:
+#         enable_basic_auth: false
+#         users:
+#           admin: "{{ 'admin' | password_hash('bcrypt', ('admin@example.com/nginx-sso' | bcrypt_salt)) }}"
+#         groups:
+#           admins: ["admin"]
diff --git a/roles/nginx/auth/sso/backend/handlers/main.yml b/roles/nginx/auth/sso/backend/handlers/main.yml
new file mode 100644
index 00000000..2209c7bf
--- /dev/null
+++ b/roles/nginx/auth/sso/backend/handlers/main.yml
@@ -0,0 +1,12 @@
+---
+- name: restart nginx-sso
+  loop: "{{ nginx_sso_backend_configs | list }}"
+  service:
+    name: "nginx-sso@{{ item }}.service"
+    state: restarted
+
+- name: reload nginx-sso
+  loop: "{{ nginx_sso_backend_configs | list }}"
+  service:
+    name: "nginx-sso@{{ item }}.service"
+    state: reloaded
diff --git a/roles/nginx/auth/sso/backend/tasks/main.yml b/roles/nginx/auth/sso/backend/tasks/main.yml
new file mode 100644
index 00000000..4d555d69
--- /dev/null
+++ b/roles/nginx/auth/sso/backend/tasks/main.yml
@@ -0,0 +1,37 @@
+---
+- name: install nginx-sso package
+  apt:
+    name: nginx-sso
+    state: present
+
+- name: create configuration directory
+  file:
+    path: /etc/nginx/auth/sso
+    state: directory
+
+- name: generate configuration file
+  loop: "{{ nginx_sso_backend_configs | dict2items }}"
+  loop_control:
+    label: "{{ item.key }}"
+  copy:
+    content: |
+      # ansible generated
+
+      {{ item.value | to_nice_yaml }}
+    dest: "/etc/nginx/auth/sso/{{ item.key }}.yml"
+    mode: 0400
+  notify: reload nginx-sso
+
+- name: generate systemd service unit
+  template:
+    src: nginx-sso@.service.j2
+    dest: /etc/systemd/system/nginx-sso@.service
+  notify: restart nginx-sso
+
+- name: make sure nginx-sso services are enabled and started
+  loop: "{{ nginx_sso_backend_configs | list }}"
+  systemd:
+    name: "nginx-sso@{{ item }}.service"
+    daemon_reload: yes
+    state: started
+    enabled: yes
diff --git a/roles/nginx/auth/sso/backend/templates/nginx-sso@.service.j2 b/roles/nginx/auth/sso/backend/templates/nginx-sso@.service.j2
new file mode 100644
index 00000000..e2464f6f
--- /dev/null
+++ b/roles/nginx/auth/sso/backend/templates/nginx-sso@.service.j2
@@ -0,0 +1,31 @@
+[Unit]
+Description=Nginx SSO authentication daemon (%I)
+
+[Service]
+Restart=on-failure
+ExecStart=/usr/bin/nginx-sso --config /etc/nginx/auth/sso/%i.yml --frontend-dir /usr/share/nginx-sso/frontend
+ExecReload=/bin/kill -HUP $MAINPID
+
+# systemd hardening-options
+AmbientCapabilities=
+CapabilityBoundingSet=
+DeviceAllow=/dev/null rw
+DevicePolicy=strict
+LockPersonality=true
+MemoryDenyWriteExecute=true
+NoNewPrivileges=true
+PrivateDevices=true
+PrivateTmp=true
+PrivateUsers=true
+ProtectControlGroups=true
+ProtectHome=true
+ProtectKernelModules=true
+ProtectKernelTunables=true
+ProtectSystem=full
+RemoveIPC=true
+RestrictNamespaces=true
+RestrictRealtime=true
+SystemCallArchitectures=native
+
+[Install]
+WantedBy=multi-user.target
diff --git a/roles/nginx/auth/sso/base/defaults/main.yml b/roles/nginx/auth/sso/base/defaults/main.yml
new file mode 100644
index 00000000..4e5d9d4b
--- /dev/null
+++ b/roles/nginx/auth/sso/base/defaults/main.yml
@@ -0,0 +1,7 @@
+---
+# nginx_sso_backends:
+#   example:
+#     auth_url: http://127.0.0.1:8082
+#     base_url: https://login.example.com
+#   foo:
+#     base_url: https://login.foo.bar
diff --git a/roles/nginx/auth/sso/base/tasks/main.yml b/roles/nginx/auth/sso/base/tasks/main.yml
new file mode 100644
index 00000000..dbae0bd4
--- /dev/null
+++ b/roles/nginx/auth/sso/base/tasks/main.yml
@@ -0,0 +1,6 @@
+---
+- name: generate nginx snippets
+  loop: "{{ nginx_sso_backends | dict2items }}"
+  template:
+    src: nginx.snippet.j2
+    dest: "/etc/nginx/snippets/sso-{{ item.key }}.conf"
diff --git a/roles/nginx/auth/sso/base/templates/nginx.snippet.j2 b/roles/nginx/auth/sso/base/templates/nginx.snippet.j2
new file mode 100644
index 00000000..f8558d59
--- /dev/null
+++ b/roles/nginx/auth/sso/base/templates/nginx.snippet.j2
@@ -0,0 +1,23 @@
+auth_request /sso-auth;
+error_page 401 = @error401;
+
+location /sso-auth {
+    internal;
+
+    proxy_pass {{ item.value.auth_url | default(item.value.base_url + '/auth') }};
+    proxy_pass_request_body off;
+    proxy_set_header Content-Length "";
+    proxy_set_header X-Origin-URI $request_uri;
+    proxy_set_header X-Host $http_host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+}
+
+location /sso-logout {
+    return 302 {{ item.value.base_url }}/logout?go=$scheme://$http_host/;
+}
+
+location @error401 {
+    return 302 {{ item.value.base_url }}/login?go=$scheme://$http_host$request_uri;
+}
-- 
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