From 96232fb34906f9efd98189838141d896668d3dd8 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Wed, 2 Jun 2021 02:25:33 +0200
Subject: prometheus: preliminary tls support for exporter connections

---
 .../prometheus/exporter/base/tasks/main.yml        |  4 +-
 .../prometheus/exporter/base/tasks/tls.yml         | 61 ++++++++++++++++++++++
 .../prometheus/exporter/base/templates/service.j2  |  2 +-
 3 files changed, 64 insertions(+), 3 deletions(-)
 create mode 100644 roles/monitoring/prometheus/exporter/base/tasks/tls.yml

(limited to 'roles/monitoring/prometheus/exporter')

diff --git a/roles/monitoring/prometheus/exporter/base/tasks/main.yml b/roles/monitoring/prometheus/exporter/base/tasks/main.yml
index fab6ff7b..9a214f39 100644
--- a/roles/monitoring/prometheus/exporter/base/tasks/main.yml
+++ b/roles/monitoring/prometheus/exporter/base/tasks/main.yml
@@ -23,8 +23,8 @@
     home: /nonexistent
     create_home: no
 
-## TODO:
-## - create certificate/key
+- name: create TLS certificate and key
+  import_tasks: tls.yml
 
 - name: generate systemd service unit
   template:
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..b2731b09
--- /dev/null
+++ b/roles/monitoring/prometheus/exporter/base/tasks/tls.yml
@@ -0,0 +1,61 @@
+---
+- 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
+
+## TODO: implement remote singing using server
+
+- name: create exporter certificate
+  openssl_certificate:
+    path: /etc/ssl/prometheus/exporter/crt.pem
+    csr_path: /etc/ssl/prometheus/exporter/csr.pem
+    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
+  notify: restart prometheus-exporter-exporter
+
+## TODO: install /etc/ssl/prometheus/ca-crt.pem from server
diff --git a/roles/monitoring/prometheus/exporter/base/templates/service.j2 b/roles/monitoring/prometheus/exporter/base/templates/service.j2
index e2c54d6c..c24baf43 100644
--- a/roles/monitoring/prometheus/exporter/base/templates/service.j2
+++ b/roles/monitoring/prometheus/exporter/base/templates/service.j2
@@ -4,7 +4,7 @@ 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="{{ prometheus_exporter_listen }}"
+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
-- 
cgit v1.2.3