From c2da95882ea7a4218a4432ee5da8165aa61addfc Mon Sep 17 00:00:00 2001
From: John Klug <john.klug@multitech.com>
Date: Thu, 18 May 2017 16:16:52 -0500
Subject: Allow a variety of user-ids to be updated by mts-ubpasswd

---
 src/ubpasswd.sh | 50 ++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 44 insertions(+), 6 deletions(-)

(limited to 'src/ubpasswd.sh')

diff --git a/src/ubpasswd.sh b/src/ubpasswd.sh
index 1a32ef4..9fea52d 100755
--- a/src/ubpasswd.sh
+++ b/src/ubpasswd.sh
@@ -6,8 +6,22 @@
 # and salt.  But the password is printed
 # for reference.
 # ubpasswd -h will print usage.
+#
+# Command changes the password based on the following
+# user list.  The first user in this list that is found in
+# /etc/shadow is changed. root is only changed if mtadm
+# or admin is not found.
+ADMINLIST="mtadm admin root"
+MTS=/sys/devices/platform/mts-io
+
+if (( $(id -u) != 0 )) ; then
+  echo "Must have root privilege to procede."
+  exit 1
+fi
+
 if ! [[ -x /sbin/mts-hashpwd ]] ; then
   echo Need /sbin/mts-hashpwd to proceed.
+  exit 1
 fi
 usage() {
   echo "ubpasswd [-u] [-d] [-s salt] [password]"
@@ -54,9 +68,6 @@ fi
 
 len=8
 saltlen=128
-mts=/sys/devices/platform/mts-io
-did=$(cat "${mts}/device-id")
-mac=$(cat "${mts}/mac-eth")
 
 if ! /bin/fgrep "mts password protected" /dev/mtdblock2 >/dev/null 2>&1;  then
 	echo "U-Boot does not support password protection."
@@ -71,8 +82,19 @@ echo "salt: $salt"
 ((debug)) && echo upwd is $upwd
 ((debug)) && echo did length is ${#did}
 if ((upwd == 0)) ; then
+  if ! [[ -f "${MTS}/device-id" ]] ; then
+    echo "${MTS}/device-id not found.  Maybe mts-io driver is not loaded?"
+    exit 1
+  fi
+  if ! [[ -f "${MTS}/mac-eth" ]] ; then
+    echo "${MTS}/mac-eth not found.  Maybe mts-io driver is not loaded?"
+    exit 1
+  fi
+
+  did=$(cat "${MTS}/device-id")
+  mac=$(cat "${MTS}/mac-eth")
   if ((${#did} == 0)) ; then
-    echo "${mts}/device-id must have a non-zero length value"
+    echo "${MTS}/device-id must have a non-zero length value"
     usage
   fi
     if ((${#mac} == 0)) ; then
@@ -99,8 +121,24 @@ pass="${BASH_REMATCH[1]}"
 password_hash="${BASH_REMATCH[2]}"
 echo "uboot password hash: \"$password_hash\""
 if ((ubonly == 0)) ; then
-  echo "setting root password to ${pass}"
-  echo -e "${pass}\n${pass}" | /usr/bin/passwd >/dev/null 2>&1
+  rstring="^"${ADMINLIST// /:|^}":"
+  list=" "$(egrep "${rstring}" /etc/shadow | sed 's/:.*//')" "
+  for u in $ADMINLIST ; do
+    ((debug)) && echo "list is: $list, u: is $u"
+    if [[ $list =~ [[:space:]]${u}[[:space:]] ]] ; then
+      USER="${u}"
+      ((debug)) && echo Change password of $USER
+      break
+    fi
+  done
+  if ((${#USER} == 0)) ; then
+    echo "No administrator user found"
+    echo "Cannot change the administrator password"
+    echo "Suggest using the \"-u\" option"
+    exit 1
+  fi
+  echo "setting ${USER} password to ${pass}"
+  echo -e "${pass}\n${pass}" | /usr/bin/passwd "${USER}" >/dev/null 2>&1
 fi
 echo "u-boot password is ${pass}"
 set -x
-- 
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