Allow setting unix socket mode

Signed-off-by: Katalin Rebhan <me@dblsaiko.net>

Author: 2xsaiko

crates/cli/src/server.rs

@@ -5,9 +5,10 @@
 // Please see LICENSE in the repository root for full details.
 
 use std::{
+    fs,
     future::ready,
     net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr, TcpListener, ToSocketAddrs},
-    os::unix::net::UnixListener,
+    os::unix::{fs::PermissionsExt, net::UnixListener},
 };
 
 use anyhow::Context;
@@ -377,8 +378,20 @@ pub fn build_listeners(
                 listener.try_into()?
             }
 
-            HttpBindConfig::Unix { socket } => {
+            HttpBindConfig::Unix { socket, mode } => {
                 let listener = UnixListener::bind(socket).context("could not bind socket")?;
+
+                if let Some(mode) = mode {
+                    let mut permissions = fs::metadata(socket)
+                        .context("could not read socket metadata")?
+                        .permissions();
+                    let mode = u32::from_str_radix(mode, 8)
+                        .with_context(|| format!("could not parse mode: {mode}"))?;
+                    permissions.set_mode(mode);
+                    fs::set_permissions(socket, permissions)
+                        .context("could not set socket permissions")?;
+                }
+
                 listener.try_into()?
             }
 

crates/config/src/sections/http.rs

@@ -36,6 +36,10 @@ fn http_address_example_4() -> &'static str {
     "0.0.0.0:8080"
 }
 
+fn unix_mode_example() -> Option<String> {
+    Some("660".to_string())
+}
+
 #[cfg(not(any(feature = "docker", feature = "dist")))]
 fn http_listener_assets_path_default() -> Utf8PathBuf {
     "./frontend/dist/".into()
@@ -124,6 +128,11 @@ pub enum BindConfig {
         /// Path to the socket
         #[schemars(with = "String")]
         socket: Utf8PathBuf,
+
+        /// Socket file mode. A string representing UNIX permission bits, in octal
+        /// integer format.
+        #[schemars(example = "unix_mode_example")]
+        mode: Option<String>,
     },
 
     /// Accept connections on file descriptors passed by the parent process.

docs/config.schema.json

@@ -893,6 +893,13 @@
             "socket": {
               "description": "Path to the socket",
               "type": "string"
+            },
+            "mode": {
+              "description": "Socket file mode. A string representing UNIX permission bits, in octal integer format.",
+              "examples": [
+                "660"
+              ],
+              "type": "string"
             }
           }
         },

docs/reference/configuration.md

@@ -58,6 +58,7 @@ http:
 
         # Third option: listen on the given UNIX socket
         - socket: /tmp/mas.sock
+          mode: "660" # permissions to set on the socket, optional
 
         # Fourth option: grab an already open file descriptor given by the parent process
         # This is useful when using systemd socket activation