From da82d052a88f0662acbcacb35a18a2f5f855c96a Mon Sep 17 00:00:00 2001
From: Aathavan <7279940-aathavan@users.noreply.gitlab.com>
Date: Tue, 11 Apr 2023 08:04:22 +0000
Subject: [PATCH] Port Samba role

---
 home/.chezmoi.yaml.tmpl                       |  9 +++
 .../run_onchange_after_30-samba.tmpl          | 10 ---
 .../run_onchange_after_51-samba.tmpl          | 81 +++++++++++++++++++
 .../rclone/system/s3-docker.service.tmpl      | 14 ++++
 .../rclone/system/s3-public.service.tmpl      |  2 +-
 .../rclone/system/s3-system.service.tmpl      | 14 ++++
 home/dot_config/samba/config.tmpl             | 67 +++++++++++++++
 7 files changed, 186 insertions(+), 11 deletions(-)
 delete mode 100644 home/.chezmoiscripts/universal/run_onchange_after_30-samba.tmpl
 create mode 100644 home/.chezmoiscripts/universal/run_onchange_after_51-samba.tmpl
 create mode 100644 home/dot_config/rclone/system/s3-docker.service.tmpl
 create mode 100644 home/dot_config/rclone/system/s3-system.service.tmpl
 create mode 100644 home/dot_config/samba/config.tmpl

diff --git a/home/.chezmoi.yaml.tmpl b/home/.chezmoi.yaml.tmpl
index 5825e2a5..e44c5833 100644
--- a/home/.chezmoi.yaml.tmpl
+++ b/home/.chezmoi.yaml.tmpl
@@ -115,6 +115,9 @@
 {{-   writeToStdout "Chezmoi is running in headless environment.\n" -}}
 {{- end -}}
 
+{{- $sambaNetBiosName := (default $hostname (env "SAMBA_NETBIOS_NAME")) -}}
+{{- $sambaWorkGroupName := (default "BETELGEUSE" (env "SAMBA_WORKGROUP")) -}}
+
 encryption: "age"
 age:
   identity: "{{ .chezmoi.homeDir }}/.config/age/chezmoi.txt"
@@ -136,10 +139,14 @@ data:
       secondary: 1.1.1.1#cloudflare-dns.com
     docker:
       doRegion: nyc1
+    domain: "{{ $domain }}"
     headless: {{ $headless }}
     home: "{{ .chezmoi.homeDir }}"
     homeParentFolder: "{{ if eq .chezmoi.os "linux" }}/home{{ else if eq .chezmoi.os "darwin" }}/Users{{ else }}C:\Users{{ end }}"
     hostname: "{{ $hostname }}"
+    samba:
+      netbiosName: "{{ $sambaNetBiosName }}"
+      workgroup: "{{ $sambaWorkGroupName }}"
     ssh:
       allowTCPForwarding: no
       allowUsers: {{ output "echo" "$USER" }}
@@ -149,6 +156,7 @@ data:
       excludedSubnets:
         - 10.0.0.0/24
         - 10.14.50.0/24
+        - 192.168.1.0/24
     qubes: {{ ne (stat (joinPath "usr" "bin" "qubes-session")) false }}
     restricted: {{ $restricted }}
     softwareGroup: "{{ $softwareGroup }}"
@@ -163,6 +171,7 @@ data:
       r2: "{{ $cloudflareR2AccountId }}"
       username: "{{ $cloudflareUsername }}"
     defaultBrowser: firefox
+    # `domain` is kept here for backwards compatibility, but the .host.domain is the preferred selector
     domain: "{{ $domain }}"
     email: "{{ $email }}"
     gcloud:
diff --git a/home/.chezmoiscripts/universal/run_onchange_after_30-samba.tmpl b/home/.chezmoiscripts/universal/run_onchange_after_30-samba.tmpl
deleted file mode 100644
index 239e8278..00000000
--- a/home/.chezmoiscripts/universal/run_onchange_after_30-samba.tmpl
+++ /dev/null
@@ -1,10 +0,0 @@
-{{- if (ne .host.distro.family "windows") -}}
-#!/usr/bin/env bash
-
-{{ includeTemplate "universal/profile" }}
-{{ includeTemplate "universal/logg" }}
-
-# Samba logic
-echo true
-
-{{ end -}}
diff --git a/home/.chezmoiscripts/universal/run_onchange_after_51-samba.tmpl b/home/.chezmoiscripts/universal/run_onchange_after_51-samba.tmpl
new file mode 100644
index 00000000..9ba2bdeb
--- /dev/null
+++ b/home/.chezmoiscripts/universal/run_onchange_after_51-samba.tmpl
@@ -0,0 +1,81 @@
+{{- if (ne .host.distro.family "windows") -}}
+#!/usr/bin/env bash
+# @file Samba Configuration
+# @brief This script configures Samba by applying the configuration stored in `${XDG_DATA_HOME:-$HOME/.config}/samba/config` if the `smbd` application is available
+# @description
+#     This script applies the Samba configuration stored in `${XDG_DATA_HOME:-$HOME/.config}/samba/config` if Samba is installed.
+#     The script and default configuration set up two Samba shares.
+#
+#     ## Security
+#
+#     Both shares are configured by default to only accept connections
+#     from hosts with DNS that ends in `.local.PUBLIC_SERVICES_DOMAIN`, where `PUBLIC_SERVICES_DOMAIN` is an environment variable that
+#     can be passed into Install Doctor. So, if your `PUBLIC_SERVICES_DOMAIN` environment variable is set to `megabyte.space`, then
+#     a device with a FQDN of `alpha.local.megabyte.space` pointing to its LAN location will be able to connect but a device
+#     with a FQDN of `alpha.megabyte.space` will not be able to connect.
+#
+#     ## Samba Shares / S3 Backup
+#
+#     If CloudFlare R2 credentials are provided, Samba is configured to store its shared files in the Rclone mounts so that your
+#     Samba shares are synchronized to the S3 buckets. If not, new folders are created. Either way, the folder / symlink that the
+#     shares host data from are stored at `/mnt/samba-private` and `/mnt/samba-public`.
+#
+#     1. The **public** share (named "Public") can be accessed by anyone (including write permissions with the default settings)
+#     2. The **private** share (named "Private") can be accessed by specifying the PAM credentials of anyone who has an account that is included in the `sambausers` group
+#
+#     ## Symlinks
+#
+#     Symlinks are disabled for security reasons. This is because, with symlinking enabled, people can create symlinks on the shares and use the symlinks to access system files outside of the
+#     Samba shares. There are commented-out lines in the default configuration that you can uncomment to enable the symlinks in shares.
+#
+#     ## Printers
+#
+#     Printer sharing is not enabled by default. There are commented lines in the default configuration that should provide a nice stepping
+#     stone if you want to use Samba for printer sharing (with CUPS).
+#
+#     ## Environment Variables
+#
+#     The following chart details some of the environment variables that are used to determine the configuration of the
+#     Samba shares:
+#
+#     | Environment Variable        | Description                                                                                         |
+#     |-----------------------------|-----------------------------------------------------------------------------------------------------|
+#     | `PUBLIC_SERVICES_DOMAIN`    | Used to determine which hosts can connect to the Samba share (e.g. `.local.PUBLIC_SERVICES_DOMAIN`) |
+#     | `SAMBA_NETBIOS_NAME`        | Determines the NetBIOS name (defaults to the `HOSTNAME` environment variable value)                 |
+#     | `SAMBA_WORKGROUP`           | Controls Samba workgroup name (defaults to "BETELGEUSE")                                            |
+#
+#     ## Links
+#
+#     * [Default Samba configuration](https://github.com/megabyte-labs/install.doctor/tree/master/home/dot_local/samba/config.tmpl)
+#     * [Secrets / Environment variables documentation](https://install.doctor/docs/customization/secrets)
+
+{{ includeTemplate "universal/profile" }}
+{{ includeTemplate "universal/logg" }}
+
+### Configure Samba server
+if command -v smbd > /dev/null; then
+    ### Ensure private Samba directory / symlink exists
+    if [ -d /mnt/s3-private ] && [ ! -d /mnt/samba-private ]; then
+        sudo ln -s /mnt/s3-private /mnt/samba-private
+    else
+        sudo mkdir /mnt/samba-private
+    fi
+
+    ### Ensure public Samba directory / symlink exists
+    if [ -d /mnt/s3-public ] && [ ! -d /mnt/samba-public ]; then
+        sudo ln -s /mnt/s3-public /mnt/samba-public
+    else
+        sudo mkdir /mnt/samba-public
+    fi
+
+    ### Copy the Samba server configuration file
+    logg info "Copying Samba server configuration to /etc/samba/smb.conf"
+    sudo cp -f "${XDG_DATA_HOME:-$HOME/.config}/samba/config" "/etc/samba/smb.conf"
+
+    ### Reload configuration file changes
+    smbcontrol smbd reload-config
+else
+    logg info "Samba server is not installed"
+fi
+
+{{ end -}}
diff --git a/home/dot_config/rclone/system/s3-docker.service.tmpl b/home/dot_config/rclone/system/s3-docker.service.tmpl
new file mode 100644
index 00000000..d6efc0d7
--- /dev/null
+++ b/home/dot_config/rclone/system/s3-docker.service.tmpl
@@ -0,0 +1,14 @@
+[Unit]
+Description=rclone S3 service (docker)
+After=network-online.target
+
+[Service]
+Type=simple
+User=rclone
+ExecStart=/usr/local/bin/rclone-mount "rclone" "rclone" "s3-docker"
+ExecStop=/bin/fusermount -u /mnt/s3-docker
+Restart=always
+RestartSec=10
+
+[Install]
+WantedBy=default.target
diff --git a/home/dot_config/rclone/system/s3-public.service.tmpl b/home/dot_config/rclone/system/s3-public.service.tmpl
index 0c893775..1ff090fe 100644
--- a/home/dot_config/rclone/system/s3-public.service.tmpl
+++ b/home/dot_config/rclone/system/s3-public.service.tmpl
@@ -1,5 +1,5 @@
 [Unit]
-Description=rclone S3 system service (public)
+Description=rclone S3 service (public)
 After=network-online.target
 
 [Service]
diff --git a/home/dot_config/rclone/system/s3-system.service.tmpl b/home/dot_config/rclone/system/s3-system.service.tmpl
new file mode 100644
index 00000000..72a35bcf
--- /dev/null
+++ b/home/dot_config/rclone/system/s3-system.service.tmpl
@@ -0,0 +1,14 @@
+[Unit]
+Description=rclone S3 service (system)
+After=network-online.target
+
+[Service]
+Type=simple
+User=rclone
+ExecStart=/usr/local/bin/rclone-mount "rclone" "rclone" "s3-system"
+ExecStop=/bin/fusermount -u /mnt/s3-system
+Restart=always
+RestartSec=10
+
+[Install]
+WantedBy=default.target
diff --git a/home/dot_config/samba/config.tmpl b/home/dot_config/samba/config.tmpl
new file mode 100644
index 00000000..fe327d48
--- /dev/null
+++ b/home/dot_config/samba/config.tmpl
@@ -0,0 +1,67 @@
+[global]
+  # Allow connections with hostnames that can be resolved from hostname.local.{{ .user.domain }}
+  allow hosts = .local.{{ .user.domain }}
+  hostname lookups = yes
+  # Allows users without accounts to log in and be assigned to the guest account
+  map to guest = bad user
+  netbios name = {{ .host.samba.netbiosName }}
+  obey pam restrictions = yes
+  proxy = no
+  # Allow using DNS to specify allowed hosts
+  # Source: https://serverfault.com/questions/702455/samba-hosts-allow-example-com
+  dns proxy = yes
+  security = user
+  server role = standalone server
+  server string = Samba on %L
+  workgroup = {{ .host.samba.workgroup }}
+  # Printing - Uncomment these lines to enable Samba printer sharing with CUPSD
+  # Source: https://wiki.archlinux.org/index.php/CUPS/Printer_sharing
+  # load printers = yes
+  # printing = CUPS
+  # Symlinks - Uncomment the following two options to enable symlinking (including symlinks outside of the shared folder)
+  # This feature is disabled by default due to security concerns (i.e. people can create symlinks on the shares and access system files if the share is writable)
+  # unix extension = no
+  # wide links = yes
+
+[Private]
+  browsable = yes
+  comment = Authenticated share with read/write capabilities (backed up to S3)
+  follow symlinks = no
+  guest only = no
+  path = /mnt/samba-private
+  public = no
+  valid users = @sambausers
+  writable = true
+
+[Public]
+  browsable = yes
+  comment = Public folder provided for file sharing on the LAN (backed up to S3)
+  follow symlinks = no
+  guest only = yes
+  path = /mnt/samba-public
+  public = yes
+  writable = yes
+
+# [printers]
+#   browsable = yes
+#   comment = Printers
+#   path = /var/spool/samba/
+#   printable = yes
+#   public = yes
+#   writable = no
+
+# [print]
+#   browsable = yes
+#   comment = Printer drivers
+#   path = /var/lib/samba/printers
+#   public = yes
+#   writable = no
+
+# [HPOfficeJetPro]
+#   comment = HP OfficeJet Pro printer
+#   path = /var/spool/samba/
+#   printable = yes
+#   # Source: https://wiki.samba.org/index.php/Setting_up_Samba_as_a_Print_Server
+#   printer name = HP OfficeJet Pro 6978
+#   public = yes
+#   writable = no