dhcpcd: create dhcpcd user and chroot folder

dhcpcd 9.x adds privelege seperation by creating a chroot
and running parts of the client not as root.

Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>

config/etc/group

@@ -20,6 +20,7 @@ dip:x:40:
 ftp:x:45:
 rsyncd:x:48:
 stunnel:x:51:
+dhcpcd:x:52:
 lock:x:54:
 sshd:x:74:
 pcap:x:77:

config/etc/passwd

@@ -7,6 +7,7 @@ ntp:x:38:38::/etc/ntp:/bin/false
 ftp:x:45:45:anonymous_user:/home/ftp:/bin/false
 rsyncd:x:48:48:rsyncd Daemon:/home/rsync:/bin/false
 stunnel:x:51:51:stunnel Daemon:/var/lib/stunnel:/bin/false
+dhcpcd:x:52:52:dhcpcd privsep user:/run/dhcpcd/chroot:/bin/false
 sshd:x:74:74:sshd:/var/empty:/bin/false
 nobody:x:99:99:Nobody:/home/nobody:/bin/false
 postfix:x:100:100::/var/spool/postfix:/bin/false

src/initscripts/system/mountkernfs

@@ -34,6 +34,11 @@ case "${1}" in
 			mount -n -t tmpfs -o nosuid,nodev,mode=755,size=8M /run /run || failed=1
 		fi
 
+		# create folder for dhcpcd changeroot
+		mkdir -p /run/dhcpcd/chroot
+		chown dhcpcd:dhcpcd /run/dhcpcd/chroot
+		chmod 750 /run/dhcpcd/chroot
+
 		boot_mesg "" ${NORMAL}
 
 		(exit ${failed})