initrd: track files in /boot in kexec_tree.txt

Fixes #1248

initrd/bin/gui-init

@@ -66,12 +66,13 @@ verify_global_hashes()
   # Check the hashes of all the files, ignoring signatures for now
   check_config /boot force
   TMP_HASH_FILE="/tmp/kexec/kexec_hashes.txt"
+  TMP_TREE_FILE="/tmp/kexec/kexec_tree.txt"
   TMP_PACKAGE_TRIGGER_PRE="/tmp/kexec/kexec_package_trigger_pre.txt"
   TMP_PACKAGE_TRIGGER_POST="/tmp/kexec/kexec_package_trigger_post.txt"
 
-  if ( cd /boot && sha256sum -c "$TMP_HASH_FILE" > /tmp/hash_output ) then
+  if verify_checksums /boot ; then
     return 0
-  elif [ ! -f $TMP_HASH_FILE ]; then
+  elif [[ ! -f "$TMP_HASH_FILE" || ! -f "$TMP_TREE_FILE" ]] ; then
     if (whiptail $BG_COLOR_ERROR --title 'ERROR: Missing Hash File!' \
         --yesno "The file containing hashes for /boot is missing!\n\nIf you are setting this system up for the first time, select Yes to update\nyour list of checksums.\n\nOtherwise this could indicate a compromise and you should select No to\nreturn to the main menu.\n\nWould you like to update your checksums now?" 0 80) then
       if update_checksums ; then

initrd/bin/kexec-select-boot

@@ -52,7 +52,7 @@ verify_global_hashes()
 {
 	echo "+++ Checking verified boot hash file "
 	# Check the hashes of all the files
-	if cd $bootdir && sha256sum -c "$TMP_HASH_FILE" > /tmp/hash_output ; then
+	if verify_checksums "$bootdir" ; then
 		echo "+++ Verified boot hashes "
 		valid_hash='y'
 		valid_global_hash='y'
@@ -326,6 +326,7 @@ while true; do
 	TMP_DEFAULT_FILE=`find /tmp/kexec/kexec_default.*.txt 2>/dev/null | head -1` || true
 	TMP_MENU_FILE="/tmp/kexec/kexec_menu.txt"
 	TMP_HASH_FILE="/tmp/kexec/kexec_hashes.txt"
+	TMP_TREE_FILE="/tmp/kexec/kexec_tree.txt"
 	TMP_DEFAULT_HASH_FILE="/tmp/kexec/kexec_default_hashes.txt"
 	TMP_ROLLBACK_FILE="/tmp/kexec/kexec_rollback.txt"
 	TMP_KEY_DEVICES="/tmp/kexec/kexec_key_devices.txt"
@@ -385,4 +386,4 @@ while true; do
 	fi
 done
 
-die "!!! Shouldn't get here""
+die "!!! Shouldn't get here"

initrd/bin/kexec-sign-config

@@ -27,12 +27,16 @@ confirm_gpg_card
 if [ "$update" = "y" ]; then
 	(
 		cd /boot
-		find ./ -type f ! -name '*kexec*' -print0 | xargs -0 sha256sum > /boot/kexec_hashes.txt
+		find ./ -type f ! -path './kexec*' -print0 | xargs -0 sha256sum > /boot/kexec_hashes.txt
 		if [ -e /boot/kexec_default_hashes.txt ]; then
 			DEFAULT_FILES=$(cat /boot/kexec_default_hashes.txt | cut -f3 -d ' ')
 			echo $DEFAULT_FILES | xargs sha256sum > /boot/kexec_default_hashes.txt
 		fi
+
+		#also save the file & directory structure to detect added files
+		print_tree > /boot/kexec_tree.txt
 	)
+	[ $? -eq 0 ] || die "$paramsdir: Failed to update hashes."
 
 	# Remove any package trigger log files
 	# We don't need them after the user decides to sign

initrd/bin/oem-factory-reset

@@ -195,9 +195,14 @@ generate_checksums()
     fi
 
     # generate hashes
-    find /boot -type f ! -name '*kexec*' -print0 \
-        | xargs -0 sha256sum > /boot/kexec_hashes.txt 2>/dev/null \
-        || whiptail_error_die "Error generating kexec hashes"
+    (
+        set -e -o pipefail
+        cd /boot
+        find ./ -type f ! -path './kexec*' -print0 \
+            | xargs -0 sha256sum > /boot/kexec_hashes.txt 2>/dev/null
+        print_tree > /boot/kexec_tree.txt
+    )
+    [ $? -eq 0 ] || whiptail_error_die "Error generating kexec hashes"
 
     param_files=`find /boot/kexec*.txt`
     [ -z "$param_files" ] \

initrd/etc/functions

@@ -337,6 +337,31 @@ update_checksums()
 	return $rv
 }
 
+print_tree() {
+	#use \x0 as long as possible to avoid issues with newlines in file names
+	find ./ ! -path './kexec*' -print0 | sort -z | xargs -0 printf "%s\n"
+}
+
+verify_checksums()
+{
+	local boot_dir="$1"
+
+	(
+		set +e -o pipefail
+		local ret=0
+		cd "$boot_dir" || ret=1
+		sha256sum -c "$TMP_HASH_FILE" > /tmp/hash_output || ret=1
+
+		# also make sure that the file & directory structure didn't change
+		# (sha256sum won't detect added files)
+		print_tree > /tmp/tree_output || ret=1
+		diff "$TMP_TREE_FILE" /tmp/tree_output > /tmp/tree_diff || ret=1
+		grep -E '^\+[^\+].*$' /tmp/tree_diff | sed -E 's/^\+(.*)/(new) \1/g' >> /tmp/hash_output
+		exit $ret
+	)
+	return $?
+}
+
 # detect and set /boot device
 # mount /boot if successful
 detect_boot_device()