nixos/uwsgi: add support for POSIX capabilities
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rnhmjoj
parent
01c7c2815c
commit
c00240e41e
2 changed files with 104 additions and 28 deletions
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@ -5,11 +5,24 @@ with lib;
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let
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cfg = config.services.uwsgi;
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isEmperor = cfg.instance.type == "emperor";
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imperialPowers =
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[
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# spawn other user processes
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"CAP_SETUID" "CAP_SETGID"
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"CAP_SYS_CHROOT"
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# transfer capabilities
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"CAP_SETPCAP"
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# create other user sockets
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"CAP_CHOWN"
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];
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buildCfg = name: c:
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let
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plugins =
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if any (n: !any (m: m == n) cfg.plugins) (c.plugins or [])
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then throw "`plugins` attribute in UWSGI configuration contains plugins not in config.services.uwsgi.plugins"
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then throw "`plugins` attribute in uWSGI configuration contains plugins not in config.services.uwsgi.plugins"
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else c.plugins or cfg.plugins;
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hasPython = v: filter (n: n == "python${v}") plugins != [];
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@ -18,7 +31,7 @@ let
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python =
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if hasPython2 && hasPython3 then
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throw "`plugins` attribute in UWSGI configuration shouldn't contain both python2 and python3"
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throw "`plugins` attribute in uWSGI configuration shouldn't contain both python2 and python3"
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else if hasPython2 then cfg.package.python2
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else if hasPython3 then cfg.package.python3
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else null;
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@ -43,7 +56,7 @@ let
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oldPaths = filter (x: x != null) (map getPath env');
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in env' ++ [ "PATH=${optionalString (oldPaths != []) "${last oldPaths}:"}${pythonEnv}/bin" ];
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}
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else if c.type == "emperor"
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else if isEmperor
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then {
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emperor = if builtins.typeOf c.vassals != "set" then c.vassals
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else pkgs.buildEnv {
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@ -51,7 +64,7 @@ let
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paths = mapAttrsToList buildCfg c.vassals;
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};
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} // removeAttrs c [ "type" "vassals" ]
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else throw "`type` attribute in UWSGI configuration should be either 'normal' or 'emperor'";
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else throw "`type` attribute in uWSGI configuration should be either 'normal' or 'emperor'";
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};
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in pkgs.writeTextDir "${name}.json" (builtins.toJSON uwsgiCfg);
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@ -79,7 +92,7 @@ in {
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};
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instance = mkOption {
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type = with lib.types; let
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type = with types; let
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valueType = nullOr (oneOf [
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bool
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int
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@ -137,31 +150,65 @@ in {
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user = mkOption {
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type = types.str;
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default = "uwsgi";
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description = "User account under which uwsgi runs.";
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description = "User account under which uWSGI runs.";
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};
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group = mkOption {
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type = types.str;
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default = "uwsgi";
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description = "Group account under which uwsgi runs.";
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description = "Group account under which uWSGI runs.";
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};
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capabilities = mkOption {
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type = types.listOf types.str;
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apply = caps: caps ++ optionals isEmperor imperialPowers;
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default = [ ];
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example = literalExample ''
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[
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"CAP_NET_BIND_SERVICE" # bind on ports <1024
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"CAP_NET_RAW" # open raw sockets
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]
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'';
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description = ''
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Grant capabilities to the uWSGI instance. See the
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<literal>capabilities(7)</literal> for available values.
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<note>
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<para>
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uWSGI runs as an unprivileged user (even as Emperor) with the minimal
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capabilities required. This option can be used to add fine-grained
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permissions without running the service as root.
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</para>
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<para>
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When in Emperor mode, any capability to be inherited by a vassal must
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be specified again in the vassal configuration using <literal>cap</literal>.
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See the uWSGI <link
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xlink:href="https://uwsgi-docs.readthedocs.io/en/latest/Capabilities.html">docs</link>
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for more information.
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</para>
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</note>
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'';
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};
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};
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};
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config = mkIf cfg.enable {
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systemd.tmpfiles.rules = optional (cfg.runDir != "/run/uwsgi") ''
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d ${cfg.runDir} 775 ${cfg.user} ${cfg.group}
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'';
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systemd.services.uwsgi = {
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wantedBy = [ "multi-user.target" ];
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preStart = ''
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mkdir -p ${cfg.runDir}
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chown ${cfg.user}:${cfg.group} ${cfg.runDir}
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'';
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serviceConfig = {
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User = cfg.user;
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Group = cfg.group;
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Type = "notify";
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ExecStart = "${cfg.package}/bin/uwsgi --uid ${cfg.user} --gid ${cfg.group} --json ${buildCfg "server" cfg.instance}/server.json";
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ExecStart = "${cfg.package}/bin/uwsgi --json ${buildCfg "server" cfg.instance}/server.json";
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ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
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ExecStop = "${pkgs.coreutils}/bin/kill -INT $MAINPID";
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NotifyAccess = "main";
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KillSignal = "SIGQUIT";
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AmbientCapabilities = cfg.capabilities;
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CapabilityBoundingSet = cfg.capabilities;
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};
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};
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@ -6,31 +6,48 @@ import ./make-test-python.nix ({ pkgs, ... }:
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};
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machine = { pkgs, ... }: {
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services.uwsgi.enable = true;
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services.uwsgi.plugins = [ "python3" "php" ];
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services.uwsgi.instance = {
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type = "emperor";
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vassals.python = {
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users.users.hello =
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{ isSystemUser = true;
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group = "hello";
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};
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users.groups.hello = { };
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services.uwsgi = {
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enable = true;
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plugins = [ "python3" "php" ];
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capabilities = [ "CAP_NET_BIND_SERVICE" ];
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instance.type = "emperor";
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instance.vassals.hello = {
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type = "normal";
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master = true;
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workers = 2;
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http = ":8000";
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immediate-uid = "hello";
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immediate-gid = "hello";
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module = "wsgi:application";
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http = ":80";
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cap = "net_bind_service";
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pythonPackages = self: [ self.flask ];
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chdir = pkgs.writeTextDir "wsgi.py" ''
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from flask import Flask
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import subprocess
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application = Flask(__name__)
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@application.route("/")
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def hello():
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return "Hello World!"
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return "Hello, World!"
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@application.route("/whoami")
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def whoami():
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whoami = "${pkgs.coreutils}/bin/whoami"
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proc = subprocess.run(whoami, capture_output=True)
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return proc.stdout.decode().strip()
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'';
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pythonPackages = self: with self; [ flask ];
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};
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vassals.php = {
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instance.vassals.php = {
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type = "normal";
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master = true;
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workers = 2;
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http-socket = ":8001";
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http-socket = ":8000";
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http-socket-modifier1 = 14;
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php-index = "index.php";
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php-docroot = pkgs.writeTextDir "index.php" ''
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@ -44,9 +61,21 @@ import ./make-test-python.nix ({ pkgs, ... }:
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''
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machine.wait_for_unit("multi-user.target")
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machine.wait_for_unit("uwsgi.service")
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machine.wait_for_open_port(8000)
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machine.wait_for_open_port(8001)
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assert "Hello World" in machine.succeed("curl -fv 127.0.0.1:8000")
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assert "Hello World" in machine.succeed("curl -fv 127.0.0.1:8001")
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with subtest("uWSGI has started"):
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machine.wait_for_unit("uwsgi.service")
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with subtest("Vassal can bind on port <1024"):
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machine.wait_for_open_port(80)
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hello = machine.succeed("curl -f http://machine").strip()
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assert "Hello, World!" in hello, f"Excepted 'Hello, World!', got '{hello}'"
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with subtest("Vassal is running as dedicated user"):
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username = machine.succeed("curl -f http://machine/whoami").strip()
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assert username == "hello", f"Excepted 'hello', got '{username}'"
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with subtest("PHP plugin is working"):
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machine.wait_for_open_port(8000)
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assert "Hello World" in machine.succeed("curl -fv http://machine:8000")
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'';
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})
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