Add role for git server

The Git server role should support:
* git ssh protocol,
* git protocol,
* git smart http protocol.

Support for cgit will come as a separate role.

9 files changed, 347 insertions, 1 deletions

diff --git a/roles/cgit/files/cgit.conf b/roles/cgit/files/cgit.conf
new file mode 100644
index 0000000..5d7eef8
--- /dev/null
+++ b/roles/cgit/files/cgit.conf
@@ -0,0 +1,15 @@
+# Source: https://wiki.archlinux.org/title/cgit
+
+root /usr/share/cgit/;
+try_files $uri @cgit;
+
+location @cgit {
+   include fastcgi_params;
+
+   fastcgi_param SCRIPT_FILENAME /var/www/cgi-bin/cgit;
+   fastcgi_param PATH_INFO $uri;
+   fastcgi_param QUERY_STRING $args;
+   fastcgi_param HTTP_HOST $server_name;
+
+   fastcgi_pass unix:/run/fcgiwrap.sock;
+}
diff --git a/roles/git/files/.htpasswd b/roles/git/files/.htpasswd
new file mode 100644
index 0000000..0e60d7a
--- /dev/null
+++ b/roles/git/files/.htpasswd
@@ -0,0 +1,7 @@
+$ANSIBLE_VAULT;1.1;AES256
+64613131666434323730373236613166613761643131366263306138383264353036353639346262
+6538393239666239343764636635353130363866353733340a396633653761303630646332633766
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+36373163303237383063323234373635636230633738373762656339333232643631633737383465
+6234623533306338366262386238623266663861346463343239
diff --git a/roles/git/files/git.conf b/roles/git/files/git.conf
new file mode 100644
index 0000000..1434cda
--- /dev/null
+++ b/roles/git/files/git.conf
@@ -0,0 +1,16 @@
+# Source: https://gist.github.com/kierdwyn/3745400e6a184f621b92
+
+location ~ /.+/(info/refs|git-upload-pack|git-receive-pack) {
+    # Set chunks to unlimited, as the body's can be huge.
+    client_max_body_size 0;
+
+    include fastcgi_params;
+    fastcgi_param SCRIPT_FILENAME /usr/lib/git-core/git-http-backend;
+    fastcgi_param GIT_HTTP_EXPORT_ALL "";
+    fastcgi_param GIT_PROJECT_ROOT /srv/git;
+    fastcgi_param PATH_INFO $uri;
+    # Forward REMOTE_USER as we want to know when we are authenticated.
+    fastcgi_param REMOTE_USER $remote_user;
+
+    fastcgi_pass unix:/run/fcgiwrap.sock;
+}
diff --git a/roles/git/files/git.ilvokhin.com b/roles/git/files/git.ilvokhin.com
new file mode 100644
index 0000000..bea98a5
--- /dev/null
+++ b/roles/git/files/git.ilvokhin.com
@@ -0,0 +1,26 @@
+server {
+    server_name git.ilvokhin.com;
+
+    auth_basic "Restricted";
+    auth_basic_user_file /etc/nginx/auth/git/.htpasswd;
+
+    # Asterisk (*) is here to match both git.conf and cgit.conf (if the latter
+    # exists), because cgit comes with a separate role, but they share one
+    # server (git.ilvokhin.com) for usage convenience.
+    include includes/*git.conf
+
+    listen 443 ssl;
+    ssl_certificate /etc/letsencrypt/live/git.ilvokhin.com/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/git.ilvokhin.com/privkey.pem;
+}
+
+server {
+    if ($host = git.ilvokhin.com) {
+        return 301 https://$host$request_uri;
+    }
+
+    server_name git.ilvokhin.com;
+    listen 80;
+
+    return 404;
+}
diff --git a/roles/git/files/id_rsa b/roles/git/files/id_rsa
new file mode 100644
index 0000000..4398f82
--- /dev/null
+++ b/roles/git/files/id_rsa
@@ -0,0 +1,136 @@
+$ANSIBLE_VAULT;1.1;AES256
+34336539613662653738386238613339326134393961643237383132653634373939363663396161
+6536323463323938303138623433653837346639353530330a336132353837323062396231303033
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diff --git a/roles/git/files/id_rsa.pub b/roles/git/files/id_rsa.pub
new file mode 100644
index 0000000..b8b0d6c
--- /dev/null
+++ b/roles/git/files/id_rsa.pub
@@ -0,0 +1 @@
+ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQC4CIFGDMVLHw34NaBVmf1lPlHOF3LtUYkw5S+TTzwgLdKwFcUPV9wHZrCmuIRyAlvEx51h+wqx9HCOZowLt5cYtCspsxrV49xkXmEUUShTmRMMGGsRa06LfYl2S528bl95XRyqqngiUROLWjpWpj4grsfkc+cgnJ8gOK0OAhWZq/w0ip8rNS0ZYc9HR0R5g8lxZtblB7hc4MveIJYmLWC1x+H2jHlZN68I8urGCITigCgKQrGN0wCUNW27m+alAeVXUSk9xI8ALDwu8pwajLVAlYL+FlB588uQ8/4QdPYtrpsxrR9weEVDf7fpLInxQ2bvD9y5XKosL4y20evLmHozykHHf6WhDvEaF4ojq21luVltpBQriTGWlxB4YQCZVU3YoTfvUEbdDXPrvss9+foMK/vY69gQAn0daQ0ZZwzN0kimXJVO9vbQwIc5H0RTjB8ltVYZKWTIEq6YLLxKeaeib8MjyCvjL53KLa/Xyrinj5gzdOwyi1cvuYmlBYf6Lbs= git@git.ilvokhin.com
diff --git a/roles/git/files/no-interactive-login b/roles/git/files/no-interactive-login
new file mode 100644
index 0000000..7e6f6c5
--- /dev/null
+++ b/roles/git/files/no-interactive-login
@@ -0,0 +1,6 @@
+#! /usr/bin/env sh
+
+echo "Hello! You've successfully authenticated," \
+     "but I do not provide interactive shell access."
+
+exit 128
diff --git a/roles/git/tasks/main.yml b/roles/git/tasks/main.yml
new file mode 100644
index 0000000..4134e75
--- /dev/null
+++ b/roles/git/tasks/main.yml
@@ -0,0 +1,137 @@
+- name: Install git
+  ansible.builtin.package:
+    name:
+      - git
+    state: present
+
+- name: Create git user
+  ansible.builtin.user:
+    name: git
+    shell: /usr/bin/git-shell
+    home: /srv/git
+
+- name: Update authorized_keys for Git
+  ansible.posix.authorized_key:
+    user: git
+    state: present
+    # Workaround to make it work `with_fileglob`.
+    # https://github.com/ansible/ansible/issues/48819#issuecomment-623851751
+    key: "{{ lookup('file', item) }}"
+    key_options: no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty
+  with_fileglob:
+    - misc/pubkeys/*.pub
+
+- name: Setup SSH directory for Git
+  ansible.builtin.file:
+    path: /srv/git/.ssh
+    state: directory
+    owner: git
+    group: git
+    mode: u+rw,g-w,o-rwx
+
+# Private key is required to mirror repositories to GitHub.
+- name: Copy private key for Git
+  ansible.builtin.copy:
+    src: files/id_rsa
+    dest: /srv/git/.ssh/id_rsa
+    owner: git
+    group: git
+    mode: u+rw,g-rwx,o-rwx
+
+- name: Setup git-shell-commands directory
+  ansible.builtin.file:
+    path: /srv/git/git-shell-commands
+    state: directory
+    owner: git
+    group: git
+    mode: u+rwx,g-w,o-rwx
+
+- name: Copy no-interactive-login command
+  ansible.builtin.copy:
+    src: files/no-interactive-login
+    dest: /srv/git/git-shell-commands
+    owner: git
+    group: git
+    mode: u+rwx,g+rwx,o-rwx
+
+- name: Enable git-daemon
+  ansible.builtin.service:
+    name: git-daemon.socket
+    enabled: yes
+    state: started
+
+- name: Install fcgiwrap
+  ansible.builtin.package:
+    name:
+      - fcgiwrap
+    state: present
+
+- name: Enable fcgiwrap.socket
+  ansible.builtin.service:
+    name: fcgiwrap.socket
+    enabled: yes
+    state: started
+
+- name: Request SSL certificate for git.ilvokhin.com
+ ansible.builtin.include_role:
+   name: certificate
+ vars:
+   domains:
+     - git.ilvokhin.com
+
+- ansible.builtin.include_role:
+    name: nginx
+
+- name: Setup auth directory for git
+  ansible.builtin.file:
+    path: /etc/nginx/auth/git
+    state: directory
+    owner: root
+    group: root
+    mode: u+rw,g+r,o+r
+
+# Alternative approach is to use community.general.htpasswd module to manage
+# .htpasswd file. Unfortunetly, there are couple of drawbacks:
+# * Target systems should have passlib Python library installed.
+# * Passwords might leak in the Ansible debug output, or even non-debug
+#   without no_log.
+# Seems like managing good old file is more convenient at the moment.
+
+- name: Copy git .htpasswd file to manage HTTP passwords
+  ansible.builtin.copy:
+    src: files/.htpasswd
+    dest: /etc/nginx/auth/git/.htpasswd
+    owner: root
+    group: root
+    mode: u+rw,g+rw,o+r
+
+- name: Copy git.conf to handle git HTTP requests
+  ansible.builtin.copy:
+    src: files/git.conf
+    dest: /etc/nginx/includes
+    owner: root
+    group: root
+    mode: u+rw,g+rw,o+r
+  notify:
+    - Reload nginx
+
+- name: Configure nginx for git.ilvokhin.com
+  ansible.builtin.copy:
+    src: files/git.ilvokhin.com
+    dest: /etc/nginx/sites-available
+    owner: root
+    group: root
+    mode: u+rw,g+r,o+r
+  notify:
+    - Reload nginx
+
+- name: Enable git.ilvokhin.com site
+  ansible.builtin.file:
+    src: /etc/nginx/sites-available/git.ilvokhin.com
+    dest: /etc/nginx/sites-enabled/git.ilvokhin.com
+    owner: root
+    group: root
+    mode: u+rw,g+r,o+r
+    state: link
+  notify:
+    - Reload nginx
diff --git a/roles/nginx/tasks/main.yml b/roles/nginx/tasks/main.yml
index 3fe4615..891e608 100644
--- a/roles/nginx/tasks/main.yml
+++ b/roles/nginx/tasks/main.yml
@@ -10,7 +10,7 @@
     enabled: yes
     state: started
 
-- name: Setup sites directories to serve by nginx
+- name: Setup nginx directories 
   ansible.builtin.file:
     path: '{{ item }}'
     state: directory
@@ -18,6 +18,8 @@
     group: root
     mode: u+rw,g+r,o+r
   loop:
+    - /etc/nginx/auth
+    - /etc/nginx/includes
     - /etc/nginx/sites-available
     - /etc/nginx/sites-enabled