Services: Add a WebSocket service

The WebSocket service isolates communication with a WebSocket to its
own isolated process. Similar to other isolating services, it has its
own user and group.

Base/etc/SystemServer.ini

@@ -32,6 +32,16 @@ SocketPermissions=660
 User=symbol
 Lazy=1
 
+[WebSocket]
+Socket=/tmp/portal/websocket
+SocketPermissions=660
+Lazy=1
+Priority=low
+User=websocket
+BootModes=text,graphical,self-test
+MultiInstance=1
+AcceptSocketConnections=1
+
 [LookupServer]
 Socket=/tmp/portal/lookup
 SocketPermissions=660

Base/etc/group

@@ -4,7 +4,7 @@ tty:x:2:
 phys:x:3:window,anon
 audio:x:4:anon
 utmp:x:5:
-lookup:x:10:protocol,anon
+lookup:x:10:protocol,websocket,anon
 protocol:x:11:webcontent,anon
 notify:x:12:anon
 window:x:13:anon,notify
@@ -12,4 +12,5 @@ clipboard:x:14:anon,notify
 webcontent:x:15:anon
 image:x:16:anon,webcontent
 symbol:x:17:anon
+websocket:x:18:webcontent,anon
 users:x:100:anon

Base/etc/passwd

@@ -7,5 +7,6 @@ clipboard:!:14:14:Clipboard,,,:/:/bin/false
 webcontent:!:15:15:WebContent,,,:/:/bin/false
 image:!:16:16:ImageDecoder,,,:/:/bin/false
 symbol:!:17:17:SymbolServer,,,:/:/bin/false
+websocket:!:18:18:WebSocket,,,:/:/bin/false
 anon:!:100:100:Anonymous,,,:/home/anon:/bin/sh
 nona:!:200:200:Nona,,,:/home/nona:/bin/sh