begin restricting admin ops to the admin channel

src/mesh/MeshPlugin.cpp

@@ -1,4 +1,5 @@
 #include "MeshPlugin.h"
+#include "Channels.h"
 #include "MeshService.h"
 #include "NodeDB.h"
 #include <assert.h>
@@ -11,7 +12,7 @@ const MeshPacket *MeshPlugin::currentRequest;
  * If any of the current chain of plugins has already sent a reply, it will be here.  This is useful to allow
  * the RoutingPlugin to avoid sending redundant acks
  */
- MeshPacket *MeshPlugin::currentReply;
+MeshPacket *MeshPlugin::currentReply;
 
 MeshPlugin::MeshPlugin(const char *_name) : name(_name)
 {
@@ -46,8 +47,15 @@ void MeshPlugin::callPlugins(const MeshPacket &mp)
 
         pi.currentRequest = &mp;
 
-        // We only call plugins that are interested in the packet (and the message is destined to us or we are promiscious)
-        bool wantsPacket = (pi.isPromiscuous || toUs) && pi.wantPacket(&mp);
+        /// received channel
+        auto ch = channels.getByIndex(mp.channel);
+        assert(ch.has_settings);
+
+        /// Is the channel this packet arrived on acceptable? (security check)
+        bool rxChannelOk = !pi.boundChannel || (mp.from == 0) || (strcmp(ch.settings.name, pi.boundChannel) == 0);
+
+        /// We only call plugins that are interested in the packet (and the message is destined to us or we are promiscious)
+        bool wantsPacket = rxChannelOk && (pi.isPromiscuous || toUs) && pi.wantPacket(&mp);
         // DEBUG_MSG("Plugin %s wantsPacket=%d\n", pi.name, wantsPacket);
         if (wantsPacket) {
             pluginFound = true;
@@ -76,7 +84,7 @@ void MeshPlugin::callPlugins(const MeshPacket &mp)
         pi.currentRequest = NULL;
     }
 
-    if(currentReply) {
+    if (currentReply) {
         DEBUG_MSG("Sending response\n");
         service.sendToMesh(currentReply);
         currentReply = NULL;
@@ -109,10 +117,11 @@ void setReplyTo(MeshPacket *p, const MeshPacket &to)
 {
     assert(p->which_payloadVariant == MeshPacket_decoded_tag); // Should already be set by now
     p->to = getFrom(&to);
+    p->channel = to.channel; // Use the same channel that the request came in on
 
     // No need for an ack if we are just delivering locally (it just generates an ignored ack)
     p->want_ack = (to.from != 0) ? to.want_ack : false;
-    if(p->priority == MeshPacket_Priority_UNSET)
+    if (p->priority == MeshPacket_Priority_UNSET)
         p->priority = MeshPacket_Priority_RELIABLE;
     p->decoded.request_id = to.id;
 }

src/mesh/MeshPlugin.h

@@ -1,9 +1,9 @@
 #pragma once
 
 #include "mesh/MeshTypes.h"
-#include <vector>
 #include <OLEDDisplay.h>
 #include <OLEDDisplayUi.h>
+#include <vector>
 /** A baseclass for any mesh "plugin".
  *
  * A plugin allows you to add new features to meshtastic device code, without needing to know messaging details.
@@ -37,12 +37,20 @@ class MeshPlugin
   protected:
     const char *name;
 
-    /* Most plugins only care about packets that are destined for their node (i.e. broadcasts or has their node as the specific recipient)
-    But some plugs might want to 'sniff' packets that are merely being routed (passing through the current node).  Those plugins can set this to
-    true and their handleReceived() will be called for every packet.
+    /* Most plugins only care about packets that are destined for their node (i.e. broadcasts or has their node as the specific
+    recipient) But some plugs might want to 'sniff' packets that are merely being routed (passing through the current node). Those
+    plugins can set this to true and their handleReceived() will be called for every packet.
     */
     bool isPromiscuous = false;
 
+    /** If a bound channel name is set, we will only accept received packets that come in on that channel.
+     * A special exception (FIXME, not sure if this is a good idea) - packets that arrive on the local interface
+     * are allowed on any channel (this lets the local user do anything).
+     *
+     * We will send responses on the same channel that the request arrived on.
+     */
+    const char *boundChannel = NULL;
+
     /**
      * If this plugin is currently handling a request currentRequest will be preset
      * to the packet with the request.  This is mostly useful for reply handlers.
@@ -78,10 +86,7 @@ class MeshPlugin
      */
     virtual bool wantUIFrame() { return false; }
 
-
-
   private:
-
     /**
      * If any of the current chain of plugins has already sent a reply, it will be here.  This is useful to allow
      * the RoutingPlugin to avoid sending redundant acks
@@ -98,5 +103,5 @@ class MeshPlugin
 
 /** set the destination and packet parameters of packet p intended as a reply to a particular "to" packet
  * This ensures that if the request packet was sent reliably, the reply is sent that way as well.
-*/
+ */
 void setReplyTo(MeshPacket *p, const MeshPacket &to);

src/plugins/AdminPlugin.cpp

@@ -8,7 +8,8 @@
 
 AdminPlugin *adminPlugin;
 
-void AdminPlugin::handleGetChannel(const MeshPacket &req, uint32_t channelIndex) {
+void AdminPlugin::handleGetChannel(const MeshPacket &req, uint32_t channelIndex)
+{
     if (req.decoded.want_response) {
         // We create the reply here
         AdminMessage r = AdminMessage_init_default;
@@ -121,5 +122,6 @@ MeshPacket *AdminPlugin::allocReply()
 
 AdminPlugin::AdminPlugin() : ProtobufPlugin("Admin", PortNum_ADMIN_APP, AdminMessage_fields)
 {
-    // FIXME, restrict to the admin channel for rx
+    // restrict to the admin channel for rx
+    boundChannel = "admin";
 }