classes/image: Allow openssh empty passwords login.

Allow empty passwords login so that the default root user can login in
through openssh.

(From OE-Core rev: 39ef0a705ca059f9a7c68aa1710c81411fb7c762)

Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 9 insertions, 0 deletions

diff --git a/meta/classes/core-image.bbclass b/meta/classes/core-image.bbclass
index e2ad0fcf31..25f5c5a8dc 100644
--- a/meta/classes/core-image.bbclass
+++ b/meta/classes/core-image.bbclass
@@ -69,4 +69,6 @@ ROOTFS_POSTPROCESS_COMMAND += "rootfs_update_timestamp ; "
 
 # Zap the root password if debug-tweaks feature is not enabled
 ROOTFS_POSTPROCESS_COMMAND += '${@base_contains("IMAGE_FEATURES", "debug-tweaks", "", "zap_root_password ; ",d)}'
+# Allow openssh accept empty password login if both debug-tweaks and ssh-server-openssh are enabled
+ROOTFS_POSTPROCESS_COMMAND += '${@base_contains("IMAGE_FEATURES", "debug-tweaks ssh-server-openssh", "openssh_allow_empty_password; ", "",d)}'
 
diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
index fb932b9d66..0772363f18 100644
--- a/meta/classes/image.bbclass
+++ b/meta/classes/image.bbclass
@@ -318,6 +318,13 @@ zap_root_password () {
         mv ${IMAGE_ROOTFS}/etc/passwd.new ${IMAGE_ROOTFS}/etc/passwd
 } 
 
+# allow openssh accept login with empty password string
+openssh_allow_empty_password () {
+        if [ -e ${IMAGE_ROOTFS}${sysconfdir}/ssh/sshd_config ]; then
+                sed -i 's#.*PermitEmptyPasswords.*#PermitEmptyPasswords yes#' ${IMAGE_ROOTFS}${sysconfdir}/ssh/sshd_config
+        fi
+}
+
 # Turn any symbolic /sbin/init link into a file
 remove_init_link () {
         if [ -h ${IMAGE_ROOTFS}/sbin/init ]; then