tests: Enable wpa_supplicant D-Bus support for hwsim tests

This allows automated testing of the wpa_supplicant D-Bus interface. The
instance controlling wlan0 registers with D-Bus if dbus-daemon was
started successfully. This is only used in VM testing, i.e., not when
run-tests.sh is used on the host system with D-Bus running for normal
system purposes.

Signed-off-by: Jouni Malinen <j@w1.fi>

tests/hwsim/example-wpa_supplicant.config

@@ -52,9 +52,9 @@ CONFIG_OCSP=y
 
 #CONFIG_ELOOP_POLL=y
 
-#CONFIG_CTRL_IFACE_DBUS=y
+CONFIG_CTRL_IFACE_DBUS=y
-#CONFIG_CTRL_IFACE_DBUS_NEW=y
+CONFIG_CTRL_IFACE_DBUS_NEW=y
-#CONFIG_CTRL_IFACE_DBUS_INTRO=y
+CONFIG_CTRL_IFACE_DBUS_INTRO=y
 
 CONFIG_PEERKEY=y
 CONFIG_IEEE80211W=y

tests/hwsim/start.sh

@@ -104,8 +104,14 @@ test -f /proc/modules && sudo modprobe mac80211_hwsim radios=6 channels=$NUM_CH
 sudo ifconfig hwsim0 up
 sudo $WLANTEST -i hwsim0 -n $LOGDIR/hwsim0.pcapng -c -dt -L $LOGDIR/hwsim0 &
 for i in 0 1 2; do
+    DBUSARG=""
+    if [ $i = "0" -a -r /var/run/dbus/pid -a -r /var/run/dbus/hwsim-test ]; then
+	if $WPAS | grep -q -- -u; then
+	    DBUSARG="-u"
+	fi
+    fi
     sudo $(printf -- "$VALGRIND_WPAS" $i) $WPAS -g /tmp/wpas-wlan$i -G$GROUP -Dnl80211 -iwlan$i -c $LOGDIR/p2p$i.conf \
-         -ddKt$TRACE -f $LOGDIR/log$i &
+         -ddKt$TRACE -f $LOGDIR/log$i $DBUSARG &
 done
 sudo $(printf -- "$VALGRIND_WPAS" 5) $WPAS -g /tmp/wpas-wlan5 -G$GROUP \
     -ddKt$TRACE -f $LOGDIR/log5 &

tests/hwsim/vm/dbus.conf

@@ -0,0 +1,37 @@
+<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN"
+ "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
+<busconfig>
+  <type>system</type>
+  <user>messagebus</user>
+  <fork/>
+  <standard_system_servicedirs/>
+  <servicehelper>/usr/lib/dbus-1.0/dbus-daemon-launch-helper</servicehelper>
+  <pidfile>/var/run/dbus/pid</pidfile>
+  <auth>EXTERNAL</auth>
+  <listen>unix:path=/var/run/dbus/system_bus_socket</listen>
+  <policy context="default">
+    <allow user="*"/>
+    <deny own="*"/>
+    <deny send_type="method_call"/>
+    <allow send_type="signal"/>
+    <allow send_requested_reply="true" send_type="method_return"/>
+    <allow send_requested_reply="true" send_type="error"/>
+    <allow receive_type="method_call"/>
+    <allow receive_type="method_return"/>
+    <allow receive_type="error"/>
+    <allow receive_type="signal"/>
+    <allow send_destination="org.freedesktop.DBus"/>
+    <deny send_destination="org.freedesktop.DBus"
+          send_interface="org.freedesktop.DBus"
+          send_member="UpdateActivationEnvironment"/>
+  </policy>
+  <policy user="root">
+    <allow own="fi.epitest.hostap.WPASupplicant"/>
+    <allow send_destination="fi.epitest.hostap.WPASupplicant"/>
+    <allow send_interface="fi.epitest.hostap.WPASupplicant"/>
+    <allow own="fi.w1.wpa_supplicant1"/>
+    <allow send_destination="fi.w1.wpa_supplicant1"/>
+    <allow send_interface="fi.w1.wpa_supplicant1"/>
+    <allow receive_sender="fi.w1.wpa_supplicant1" receive_type="signal"/>
+  </policy>
+</busconfig>

tests/hwsim/vm/inside.sh

@@ -45,10 +45,16 @@ chmod +x /tmp/bin/sudo
 export PATH=/tmp/bin:$EPATH:$PATH
 
 # some tests assume adm/admin group(s) exist(s)
-echo 'adm:x:0:' > /etc/group
+cat > /etc/group <<EOF
-echo 'admin:x:0:' >> /etc/group
+adm:x:0:
+admin:x:0:
+messagebus:x:106:
+EOF
 # root should exist
-echo 'root:x:0:0:root:/tmp:/bin/bash' > /etc/passwd
+cat > /etc/passwd <<EOF
+root:x:0:0:root:/tmp:/bin/bash
+messagebus:x:102:106::/var/run/dbus:/bin/false
+EOF
 cat > /etc/ethertypes <<EOF
 IPv4	 	0800  	ip ip4
 ARP		0806	ether-arp
@@ -92,6 +98,11 @@ else
 	echo $TESTDIR/vm/uevent.sh > /sys/kernel/uevent_helper
 	COUNTRY=00 crda
 
+	mkdir -p /var/run/dbus
+	touch /var/run/dbus/hwsim-test
+	chown messagebus.messagebus /var/run/dbus
+	dbus-daemon --config-file=$TESTDIR/vm/dbus.conf --fork
+
 	cd $TESTDIR
 	./run-all.sh $ARGS </dev/ttyS0 >/dev/ttyS0 2>&1
 	if test -d /sys/kernel/debug/gcov ; then