bekkalokk/gitea-web: host pages

hosts/bekkalokk/services/gitea/web-secret-provider/default.nix

@@ -6,9 +6,9 @@ let
     "Kurs"
   ];
 
-  giteaCfg = config.services.gitea;
+  cfg = config.services.gitea;
 
-  giteaWebSecretProviderScript = pkgs.writers.writePython3 "gitea-web-secret-provider" {
+  program = pkgs.writers.writePython3 "gitea-web-secret-provider" {
     libraries = with pkgs.python3Packages; [ requests ];
     flakeIgnore = [
       "E501" # Line over 80 chars lol
@@ -20,7 +20,28 @@ let
     makeWrapperArgs = [
       "--prefix PATH : ${(lib.makeBinPath [ pkgs.openssh ])}"
     ];
-  } (builtins.fileContents ./gitea-web-secret-provider.py);
+  } (lib.pipe ./gitea-web-secret-provider.py [
+    builtins.readFile
+    (lib.splitString "\n")
+    (lib.drop 2)
+    lib.concatLines
+  ]);
+
+  commonHardening = {
+    NoNewPrivileges = true;
+    PrivateTmp = true;
+    PrivateDevices = true;
+    ProtectSystem = true;
+    ProtectHome = true;
+    ProtectControlGroups = true;
+    ProtectKernelModules = true;
+    ProtectKernelTunables = true;
+    RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
+    RestrictRealtime = true;
+    RestrictSUIDSGID = true;
+    MemoryDenyWriteExecute = true;
+    LockPersonality = true;
+  };
 in
 {
   sops.secrets."gitea/web-secret-provider/token" = {
@@ -61,7 +82,9 @@ in
   # https://www.freedesktop.org/software/systemd/man/latest/systemd.unit.html#Specifiers
   # %i - instance name (after the @)
   # %d - secrets directory
-  systemd.services."gitea-web-secret-provider@" = {
+  # %S - /var/lib
+  systemd.services = {
+    "gitea-web-secret-provider@" = {
       description = "Ensure all repos in %i has an SSH key to push web content";
       requires = [ "gitea.service" "network.target" ];
       serviceConfig = {
@@ -71,39 +94,35 @@ in
           args = lib.cli.toGNUCommandLineShell { } {
             org = "%i";
             token-path = "%d/token";
-          api-url = "${giteaCfg.settings.server.ROOT_URL}api/v1";
+            api-url = "${cfg.settings.server.ROOT_URL}api/v1";
-          key-dir = "/var/lib/gitea-web/keys/%i";
+            key-dir = "%S/gitea-web/keys/%i";
-          authorized-keys-path = "/var/lib/gitea-web/authorized_keys.d/%i";
+            authorized-keys-path = "%S/gitea-web/authorized_keys.d/%i";
-          rrsync-script = pkgs.writeShellScript "rrsync-chown" ''
+            rrsync-path = "${pkgs.rrsync}/bin/rrsync";
-            ${lib.getExe pkgs.rrsync} -wo "$1"
+            web-dir = "%S/gitea-web/web";
-            ${pkgs.coreutils}/bin/chown -R gitea:nginx "$1"
-          '';
-          web-dir = "/var/lib/gitea-web/web";
           };
-      in "${giteaWebSecretProviderScript} ${args}";
+        in "${program} ${args}";
         User = "gitea";
         Group = "gitea";
         StateDirectory = "%i";
         LoadCredential = [
           "token:${config.sops.secrets."gitea/web-secret-provider/token".path}"
         ];
-      NoNewPrivileges = true;
+      } // commonHardening;
-      PrivateTmp = true;
+    };
-      PrivateDevices = true;
+
-      ProtectSystem = true;
+    "gitea-web-chown@" = {
-      ProtectHome = true;
+      description = "Ensure all gitea-web content has correct ownership";
-      ProtectControlGroups = true;
+      serviceConfig = {
-      ProtectKernelModules = true;
+        Slice = "system-giteaweb.slice";
-      ProtectKernelTunables = true;
+        Type = "oneshot";
-      RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
+        ExecStart = "${pkgs.coreutils}/bin/chown -R gitea:nginx '%S/gitea-web/web/%i'";
-      RestrictRealtime = true;
+        PrivateNetwork = true;
-      RestrictSUIDSGID = true;
+      } // commonHardening;
-      MemoryDenyWriteExecute = true;
-      LockPersonality = true;
     };
   };
 
-  systemd.timers."gitea-web-secret-provider@" = {
+  systemd.timers = {
+    "gitea-web-secret-provider@" = {
       description = "Ensure all repos in %i has an SSH key to push web content";
       timerConfig = {
         RandomizedDelaySec = "1h";
@@ -113,7 +132,24 @@ in
       };
     };
 
-  systemd.targets.timers.wants = map (org: "gitea-web-secret-provider@${org}.timer") organizations;
+    "gitea-web-chown@" = {
+      description = "Ensure all gitea-web content is owned by the gitea user";
+      timerConfig = {
+        RandomizedDelaySec = "10m";
+        Persistent = true;
+        Unit = "gitea-web-chown@%i.service";
+        OnCalendar = "hourly";
+      };
+    };
+  };
+
+  systemd.targets.timers.wants = lib.mapCartesianProduct ({ timer, org }: "${timer}@${org}.timer") {
+    timer = [
+      "gitea-web-secret-provider"
+      "gitea-web-chown"
+    ];
+    org = organizations;
+  };
 
   services.openssh.authorizedKeysFiles = map (org: "/var/lib/gitea-web/authorized_keys.d/${org}") organizations;
 

hosts/bekkalokk/services/gitea/web-secret-provider/gitea-web-secret-provider.py

@@ -1,3 +1,6 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i python3 -p "python3.withPackages(ps: with ps; [ requests ])" openssh
+
 import argparse
 import hashlib
 import os
@@ -13,7 +16,7 @@ def parse_args():
     parser.add_argument("--api-url", metavar='URL', type=str, help="The URL of the Gitea API", default="https://git.pvv.ntnu.no/api/v1")
     parser.add_argument("--key-dir", metavar='PATH', type=Path, help="The directory to store the generated keys in", default="/run/gitea-web-secret-provider")
     parser.add_argument("--authorized-keys-path", metavar='PATH', type=Path, help="The path to the resulting authorized_keys file", default="/etc/ssh/authorized_keys.d/gitea-web-secret-provider")
-    parser.add_argument("--rrsync-script", metavar='PATH', type=Path, help="The path to a rrsync script, taking the destination path as its single argument")
+    parser.add_argument("--rrsync-path", metavar='PATH', type=Path, help="The path to the rrsync binary", default="/run/current-system/sw/bin/rrsync")
     parser.add_argument("--web-dir", metavar='PATH', type=Path, help="The directory to sync the repositories to", default="/var/www")
     parser.add_argument("--force", action="store_true", help="Overwrite existing keys")
     return parser.parse_args()
@@ -45,14 +48,15 @@ def generate_ssh_key(args: argparse.Namespace, repository: str):
             [
                 "ssh-keygen",
                 *("-t", "ed25519"),
+                *("-b", "4096"),
                 *("-f", key_path),
                 *("-N", ""),
                 *("-C", f"{args.org}/{repository}"),
             ],
             check=True,
             stdin=subprocess.DEVNULL,
-            stdout=subprocess.PIPE,
+            stdout=subprocess.DEVNULL,
-            stderr=subprocess.PIPE,
+            stderr=subprocess.DEVNULL
         )
         print(f"Generated SSH key for `{args.org}/{repository}`")
 
@@ -78,7 +82,7 @@ SSH_OPTS = ",".join([
 def generate_authorized_keys(args: argparse.Namespace, repo_public_keys: list[tuple[str, str]]):
     lines = []
     for repo, public_key in repo_public_keys:
-        command = f"{args.rrsync_script} {args.web_dir}/{args.org}/{repo}"
+        command = f"{args.rrsync_path} -wo {args.web_dir}/{args.org}/{repo}"
         lines.append(f'command="{command}",{SSH_OPTS} {public_key}')
 
     with open(args.authorized_keys_path, "w") as f: