Merge branch 'topic/prometheus'

6 files changed, 174 insertions, 28 deletions

diff --git a/roles/monitoring/prometheus/exporter/base/defaults/main.yml b/roles/monitoring/prometheus/exporter/base/defaults/main.yml
index 5f8ce103..963763a5 100644
--- a/roles/monitoring/prometheus/exporter/base/defaults/main.yml
+++ b/roles/monitoring/prometheus/exporter/base/defaults/main.yml
@@ -1,2 +1,2 @@
 ---
-prometheus_exporter_port: 9000
+prometheus_exporter_listen: ":9999"
diff --git a/roles/monitoring/prometheus/exporter/base/handlers/main.yml b/roles/monitoring/prometheus/exporter/base/handlers/main.yml
new file mode 100644
index 00000000..ebd760cf
--- /dev/null
+++ b/roles/monitoring/prometheus/exporter/base/handlers/main.yml
@@ -0,0 +1,5 @@
+---
+- name: restart prometheus-exporter-exporter
+  service:
+    name: prometheus-exporter-exporter
+    state: restarted
diff --git a/roles/monitoring/prometheus/exporter/base/tasks/main.yml b/roles/monitoring/prometheus/exporter/base/tasks/main.yml
index c3a04bd9..9a214f39 100644
--- a/roles/monitoring/prometheus/exporter/base/tasks/main.yml
+++ b/roles/monitoring/prometheus/exporter/base/tasks/main.yml
@@ -1,16 +1,40 @@
 ---
-- name: create main configuration directories
-  loop:
-  - exporters-available
-  - exporters-enabled
+- name: check if prometheus apt component of spreadspace repo is enabled
+  assert:
+    msg: "please enable the 'prometheus' component of spreadspace repo using 'spreadspace_apt_repo_components'"
+    that:
+    - spreadspace_apt_repo_components is defined
+    - "'prometheus' in spreadspace_apt_repo_components"
+
+- name: install apt packages
+  apt:
+    name: prom-exporter-exporter
+    state: present
+
+- name: create configuration directories
   file:
-    path: "/etc/prometheus-exporter/{{ item }}"
+    path: /etc/prometheus/exporter/enabled
     state: directory
 
-- name: install nginx vhost
-  vars:
-    nginx_vhost:
-      name: prometheus-exporter
-      content: "{{ lookup('template', 'nginx-vhost.conf.j2') }}"
-  include_role:
-    name: nginx/vhost
+- name: add user for prometheus-exporter
+  user:
+    name: prometheus-exporter
+    system: yes
+    home: /nonexistent
+    create_home: no
+
+- name: create TLS certificate and key
+  import_tasks: tls.yml
+
+- name: generate systemd service unit
+  template:
+    src: service.j2
+    dest: /etc/systemd/system/prometheus-exporter-exporter.service
+  notify: restart prometheus-exporter-exporter
+
+- name: make sure prometheus-exporter-exporter is enabled and started
+  systemd:
+    name: prometheus-exporter-exporter.service
+    daemon_reload: yes
+    state: started
+    enabled: yes
diff --git a/roles/monitoring/prometheus/exporter/base/tasks/tls.yml b/roles/monitoring/prometheus/exporter/base/tasks/tls.yml
new file mode 100644
index 00000000..e34025e4
--- /dev/null
+++ b/roles/monitoring/prometheus/exporter/base/tasks/tls.yml
@@ -0,0 +1,100 @@
+---
+- name: install python-cryptoraphy
+  apt:
+    name: "{{ python_basename }}-cryptography"
+    state: present
+
+- name: create base directory
+  file:
+    path: /etc/ssl/prometheus
+    state: directory
+
+- name: create exporter cert/key directory
+  file:
+    path: /etc/ssl/prometheus/exporter
+    state: directory
+    owner: root
+    group: prometheus-exporter
+    mode: 0750
+
+- name: create exporter private key
+  openssl_privatekey:
+    path: /etc/ssl/prometheus/exporter/key.pem
+    type: RSA
+    size: 4096
+    owner: prometheus-exporter
+    group: prometheus-exporter
+    mode: 0400
+  notify: restart prometheus-exporter-exporter
+
+- name: create signing request for exporter certificate
+  openssl_csr:
+    path: /etc/ssl/prometheus/exporter/csr.pem
+    privatekey_path: /etc/ssl/prometheus/exporter/key.pem
+    CN: "{{ inventory_hostname }}"
+    subject_alt_name:
+    - "DNS:{{ host_name }}.{{ host_domain }}"
+    - "IP:{{ ansible_default_ipv4.address }}"
+    key_usage:
+    - digitalSignature
+    key_usage_critical: yes
+    extended_key_usage:
+    - serverAuth
+    extended_key_usage_critical: yes
+    basic_constraints:
+    - 'CA:FALSE'
+    basic_constraints_critical: yes
+
+- name: slurp CSR
+  slurp:
+    src: /etc/ssl/prometheus/exporter/csr.pem
+  register: prometheus_exporter_server_csr
+
+- name: check if exporter certificate exists
+  stat:
+    path: /etc/ssl/prometheus/exporter/crt.pem
+  register: prometheus_exporter_server_cert
+
+- name: read exporter client certificate validity
+  when: prometheus_exporter_server_cert.stat.exists
+  openssl_certificate_info:
+    path: /etc/ssl/prometheus/exporter/crt.pem
+    valid_at:
+      ten_years: '+3650d'
+  register: prometheus_exporter_server_cert_info
+
+- name: slurp existing exporter certificate
+  when: prometheus_exporter_server_cert.stat.exists
+  slurp:
+    src: /etc/ssl/prometheus/exporter/crt.pem
+  register: prometheus_exporter_server_cert_current
+
+- name: generate exporter certificate
+  delegate_to: "{{ prometheus_server }}"
+  community.crypto.x509_certificate_pipe:
+    content: "{{ prometheus_exporter_server_cert_current.content | default('') | b64decode }}"
+    csr_content: "{{ prometheus_exporter_server_csr.content | b64decode }}"
+    provider: ownca
+    ownca_path: /etc/ssl/prometheus/ca-crt.pem
+    ownca_privatekey_path: /etc/ssl/prometheus/ca/key.pem
+    ownca_digest: sha256
+    ownca_not_after: "+18250d" ## 50 years
+    force: "{{ prometheus_exporter_server_cert.stat.exists and (not prometheus_exporter_server_cert_info.valid_at.ten_years) }}"
+  register: prometheus_exporter_server_cert
+
+- name: store exporter certificate
+  copy:
+    content: "{{ prometheus_exporter_server_cert.certificate }}"
+    dest: /etc/ssl/prometheus/exporter/crt.pem
+  notify: restart prometheus-exporter-exporter
+
+- name: slurp CA certificate
+  delegate_to: "{{ prometheus_server }}"
+  slurp:
+    src: /etc/ssl/prometheus/ca-crt.pem
+  register: prometheus_exporter_ca_certificate
+
+- name: install CA certificate
+  copy:
+    content: "{{ prometheus_exporter_ca_certificate.content | b64decode }}"
+    dest: /etc/ssl/prometheus/ca-crt.pem
diff --git a/roles/monitoring/prometheus/exporter/base/templates/nginx-vhost.conf.j2 b/roles/monitoring/prometheus/exporter/base/templates/nginx-vhost.conf.j2
deleted file mode 100644
index e032ca3d..00000000
--- a/roles/monitoring/prometheus/exporter/base/templates/nginx-vhost.conf.j2
+++ /dev/null
@@ -1,15 +0,0 @@
-server {
-  listen {{ prometheus_exporter_port }};
-  listen [::]:{{ prometheus_exporter_port }};
-  server_name _;
-
-  ## TODO: configure ssl
-
-  location / {
-     return 404 "unknown exporter: $uri\n";
-  }
-  include /etc/prometheus-exporter/exporters-enabled/*;
-
-  access_log /var/log/nginx/access-prometheus-exporter.log;
-  error_log /var/log/nginx/error-prometheus-exporter.log;
-}
diff --git a/roles/monitoring/prometheus/exporter/base/templates/service.j2 b/roles/monitoring/prometheus/exporter/base/templates/service.j2
new file mode 100644
index 00000000..c24baf43
--- /dev/null
+++ b/roles/monitoring/prometheus/exporter/base/templates/service.j2
@@ -0,0 +1,32 @@
+[Unit]
+Description=Prometheus exporter proxy
+
+[Service]
+Restart=always
+User=prometheus-exporter
+ExecStart=/usr/bin/prometheus-exporter-exporter -config.dirs=/etc/prometheus/exporter/enabled -config.file="" -web.listen-address="" -web.tls.listen-address="{{ prometheus_exporter_listen }}" -web.tls.cert="/etc/ssl/prometheus/exporter/crt.pem" -web.tls.key="/etc/ssl/prometheus/exporter/key.pem" --web.tls.ca="/etc/ssl/prometheus/ca-crt.pem" -web.tls.verify
+{# TODO: implement reloading once the exporter_exporter supports this #}
+
+# 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=strict
+RemoveIPC=true
+RestrictNamespaces=true
+RestrictRealtime=true
+SystemCallArchitectures=native
+
+[Install]
+WantedBy=multi-user.target