meta-ampere: Support Ampere password policy

Implement Ampere password policy as followings:
 - Password must between 9-20 characters, 1 lower case, 1 upper case,
   one digit and 1 special character.
 - No more than 3 consecutive identical characters.

Signed-off-by: Hieu Huynh <hieuh@os.amperecomputing.com>
Change-Id: I20134f51e06ef0aabeddfc4d1560acfa7483deab

2 files changed, 34 insertions, 0 deletions

diff --git a/meta-ampere/meta-common/recipes-extended/pam/libpam/pam.d/common-password b/meta-ampere/meta-common/recipes-extended/pam/libpam/pam.d/common-password
new file mode 100644
index 0000000000..5a42680ee2
--- /dev/null
+++ b/meta-ampere/meta-common/recipes-extended/pam/libpam/pam.d/common-password
@@ -0,0 +1,30 @@
+#
+# /etc/pam.d/common-password - password-related modules common to all services
+#
+# This file is included from other service-specific PAM config files,
+# and should contain a list of modules that define the services to be
+# used to change user passwords.  The default is pam_unix.
+
+# Explanation of pam_unix options:
+#
+# The "sha512" option enables salted SHA512 passwords.  Without this option,
+# the default is Unix crypt.  Prior releases used the option "md5".
+#
+# The "obscure" option replaces the old `OBSCURE_CHECKS_ENAB' option in
+# login.defs.
+#
+# See the pam_unix manpage for other options.
+
+# here are the per-package modules (the "Primary" block)
+password	[success=ok default=die]	pam_cracklib.so debug enforce_for_root reject_username minlen=9 difok=0 lcredit=-1 ocredit=-1 dcredit=-1 ucredit=-1 maxrepeat=3
+password	[success=ok default=die]	pam_ipmicheck.so spec_grp_name=ipmi use_authtok
+password	[success=ok ignore=ignore default=die]	pam_pwhistory.so debug enforce_for_root remember=0 use_authtok
+password	[success=ok default=die]	pam_unix.so sha512 use_authtok
+password	[success=1 default=die] 	pam_ipmisave.so spec_grp_name=ipmi spec_pass_file=/etc/ipmi_pass key_file=/etc/key_file
+# here's the fallback if no module succeeds
+password	requisite			pam_deny.so
+# prime the stack with a positive return value if there isn't one already;
+# this avoids us returning an error just because nothing sets a success code
+# since the modules above will each just jump around
+password	required			pam_permit.so
+# and here are more per-package modules (the "Additional" block)
diff --git a/meta-ampere/meta-common/recipes-extended/pam/libpam_%.bbappend b/meta-ampere/meta-common/recipes-extended/pam/libpam_%.bbappend
new file mode 100644
index 0000000000..4ede0332eb
--- /dev/null
+++ b/meta-ampere/meta-common/recipes-extended/pam/libpam_%.bbappend
@@ -0,0 +1,4 @@
+FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"
+
+SRC_URI += " file://pam.d/common-password \
+            "