One shot demo server startup

Configure the demo servers to use untrusted
tls certs so that they communicate with each other.

This configuration makes them very unsafe so I've added warnings about
it in the readme.

demo/README

+DO NOT USE THESE DEMO SERVERS IN PRODUCTION
+
 Requires you to have done:
     python setup.py develop
 
 
-The demo start.sh will start three synapse servers on ports 8080, 8081 and 8082, with host names localhost:$port. This can be easily changed to `hostname`:$port in start.sh if required. 
-It will also start a web server on port 8000 pointed at the webclient.
+The demo start.sh will start three synapse servers on ports 8080, 8081 and 8082, with host names localhost:$port. This can be easily changed to `hostname`:$port in start.sh if required.
+
+To enable the servers to communicate untrusted ssl certs are used. In order to do this the servers do not check the certs
+and are configured in a highly insecure way. Do not use these configuration files in production.
 
 stop.sh will stop the synapse servers and the webclient.
 

demo/start.sh

@@ -27,8 +27,70 @@ for port in 8080 8081 8082; do
         --config-path "$DIR/etc/$port.config" \
         --report-stats no
 
-    printf '\n\n# Customisation made by demo/start.sh\n' >> $DIR/etc/$port.config
-    echo 'enable_registration: true' >> $DIR/etc/$port.config
+    if ! grep -F "Customisation made by demo/start.sh" -q  $DIR/etc/$port.config; then
+        printf '\n\n# Customisation made by demo/start.sh\n' >> $DIR/etc/$port.config
+        
+        echo 'enable_registration: true' >> $DIR/etc/$port.config
+
+        # Warning, this heredoc depends on the interaction of tabs and spaces. Please don't
+        # accidentaly bork me with your fancy settings.
+		listeners=$(cat <<-PORTLISTENERS
+		# Configure server to listen on both $https_port and $port
+		# This overides some of the default settings above
+		listeners:
+		  - port: $https_port
+		    type: http
+		    tls: true
+		    resources:
+		      - names: [client, federation]
+		
+		  - port: $port
+		    tls: false
+		    bind_addresses: ['::1', '127.0.0.1']
+		    type: http
+		    x_forwarded: true
+		    resources:
+		      - names: [client, federation]
+		        compress: false
+		PORTLISTENERS
+		)
+        echo "${listeners}" >> $DIR/etc/$port.config
+
+        # Disable tls for the servers
+        printf '\n\n# Disable tls on the servers.' >> $DIR/etc/$port.config
+        echo '# DO NOT USE IN PRODUCTION' >> $DIR/etc/$port.config
+        echo 'use_insecure_ssl_client_just_for_testing_do_not_use: true' >> $DIR/etc/$port.config
+        echo 'federation_verify_certificates: false' >> $DIR/etc/$port.config
+
+        # Set tls paths
+        echo "tls_certificate_path: \"$DIR/etc/localhost:$https_port.tls.crt\"" >> $DIR/etc/$port.config
+        echo "tls_private_key_path: \"$DIR/etc/localhost:$https_port.tls.key\"" >> $DIR/etc/$port.config
+
+        # Generate tls keys
+        openssl req -x509 -newkey rsa:4096 -keyout $DIR/etc/localhost\:$https_port.tls.key -out $DIR/etc/localhost\:$https_port.tls.crt -days 365 -nodes -subj "/O=matrix"
+        
+        # Ignore keys from the trusted keys server
+        echo '# Ignore keys from the trusted keys server' >> $DIR/etc/$port.config
+        echo 'trusted_key_servers:' >> $DIR/etc/$port.config
+        echo '  - server_name: "matrix.org"' >> $DIR/etc/$port.config
+        echo '    accept_keys_insecurely: true' >> $DIR/etc/$port.config
+
+        # Reduce the blacklist
+        blacklist=$(cat <<-BLACK
+		# Set the blacklist so that it doesn't include 127.0.0.1
+		federation_ip_range_blacklist:
+		  - '10.0.0.0/8'
+		  - '172.16.0.0/12'
+		  - '192.168.0.0/16'
+		  - '100.64.0.0/10'
+		  - '169.254.0.0/16'
+		  - '::1/128'
+		  - 'fe80::/64'
+		  - 'fc00::/7'
+		BLACK
+		)
+        echo "${blacklist}" >> $DIR/etc/$port.config
+    fi
 
     # Check script parameters
     if [ $# -eq 1 ]; then