sing-box: Interface tun "permission denied"

Maintainer: @brvphoenix
Environment: x86_64, OpenWrt SNAPSHOT r23293-98e6ea32a4

Description:

On /etc/config/sing-box on default specify sing-box user. But if use tun mode:

Mon Jun 19 14:13:01 2023 daemon.err sing-box[3376]: FATAL[0000] start service: initialize inbound/tun[0]: configure tun interface: permission denied

/dev/net/tun must be managed with root privileges.

My inbounds, for example:

  "inbounds": [
    {
      "type": "tun",
      "interface_name": "tun0",
      "domain_strategy": "ipv4_only",
      "inet4_address": "172.19.0.1/30",
      "auto_route": false,
      "strict_route": false,
      "sniff": true 
   }
  ],

I think that in openwrt tun inbound will be the most frequently used. Perhaps you should change the default user to root.

Thanks for adding this package.

Start by inspecting the default user setting in /etc/config/sing-box and the tun inbound requirements for /dev/net/tun on OpenWrt. Reproduce the provided permission-denied error with the sample tun configuration; done means the package's default configuration handles tun mode correctly without breaking the stated non-root setup.