openvswitch: add SSL support

Open vSwitch supports SSL to connect to an OpenFlow controller. This is
recommended for security. Expand the UCI ovs config section to allow
configuring SSL CA, certificate and private key.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

net/openvswitch/Makefile

@@ -17,7 +17,7 @@ include ./openvswitch.mk
 #
 PKG_NAME:=openvswitch
 PKG_VERSION:=$(ovs_version)
-PKG_RELEASE:=5
+PKG_RELEASE:=6
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://www.openvswitch.org/releases/
 PKG_HASH:=7d5797f2bf2449c6a266149e88f72123540f7fe7f31ad52902057ae8d8f88c38

net/openvswitch/README.md

@@ -69,6 +69,19 @@ ovs ovn_northd, ovn_controller & ovs_bridge.
 Each of these supports a disabled option, which should be 
 set to 0 to launch the respective daemons.
 
+The ovs section section also supports the options below, to configure a set of
+SSL CA, certificate and private key. After adding these to Open vSwitch, you
+may specify ssl: connection methods for e.g. the OpenFlow controller. Note that
+Open vSwitch only reads these files during startup, so it needs to be restarted
+after adding or changing these options.
+
+| Name     | Type    | Required | Default | Description                       |
+|----------|---------|----------|---------|-----------------------------------|
+| disabled | boolean | no       | 0       | If set to 1, do not configure SSL |
+| ca       | string  | no       | (none)  | Path to CA certificate            |
+| cert     | string  | no       | (none)  | Path to certificate               |
+| key      | string  | no       | (none)  | Path to private key               |
+
 The ovs_bridge section also supports the options below,
 for initialising a virtual bridge with an OpenFlow controller.
 

net/openvswitch/files/openvswitch.config

@@ -1,5 +1,8 @@
 config ovs ovs
 	option disabled 1
+	option ca '/etc/openvswitch/example_ca.crt'
+	option cert '/etc/openvswitch/example_cert.crt'
+	option key '/etc/openvswitch/example_key.crt'
 
 config ovn_northd north
 	option disabled 1

net/openvswitch/files/openvswitch.init

@@ -90,6 +90,7 @@ ovs_xx() {
 		ovs)
 			"$ovs_ctl" "$action" \
 				--system-id=random 1000>&-
+			ovs_set_ssl
 			;;
 		ovn_*)
 			"$ovn_ctl" "${action}_${cfgtype#ovn_}"
@@ -216,3 +217,14 @@ ovs_bridge_init() {
 	[ -n "$controller" ] && \
 		ovs-vsctl set-controller "$name" "$controller"
 }
+
+ovs_set_ssl() {
+	local ca="$(uci -q get openvswitch.ovs.ca)"
+	[ -f "$ca" ] || return
+	local cert="$(uci get openvswitch.ovs.cert)"
+	[ -f "$cert" ] || return
+	local key="$(uci get openvswitch.ovs.key)"
+	[ -f "$key" ] || return
+
+	ovs-vsctl set-ssl "$key" "$cert" "$ca"
+}