gpg-based password wallet

I've been using the following script for a while to store passwords in an encrypted file. As you can see from the comments, it's based on a script from a linux.com article, but I've added several features which make it more agreeable to me. To use, save it as an executable file somewhere in your path (I've saved it as ~/bin/wallet).

You'll need to specify the location of the encrypted wallet file. You can do that in one of three ways:

1. with the PASSWD_LIST environment variable
2. having something like 'PASSWD_LIST=/path/to/wallet.gpg' in ~/.walletrc
3. on the command line: wallet -c /path/to/wallet.gpg
   

Then just type wallet to view your password wallet in less, or type wallet -e to edit your wallet (set your VISUAL environment variable to your favorite editor, or wallet will default to vi).

And here's the script...

#!/bin/bash

# alteration of script described at
# http://www.linux.com/article.pl?sid=07/03/06/1640216
# changes from original:
# 1. use of VISUAL envariable for editor
# 2. storage of password in variable, rather than file
# 3. view-only mode (rather than always opening in text editor)
# 4. symmetric encryption
# 5. saving backup copy of encrypted password file prior to editing
# 6. creates password wallet if it doesn't exist
# 7. encrypted file can be specified by -c option, by PASSWD_LIST
#    envariable, or in ~/.walletrc

if [ -f ~/.walletrc ]; then
. ~/.walletrc
fi

if [ -z ${VISUAL} ]; then
VISUAL=vi
fi

EDIT_PWFILE=0
while getopts 'ec:' OPTION
do
case $OPTION in
e) EDIT_PWFILE=1;;
c) PASSWD_LIST="$OPTARG";;
?) printf "usage: %s [ -e ] [ -c encrypted file ]\n" $( basename $0 ) >&2
 exit 2
 ;;
esac
done
shift $(($OPTIND - 1))

if [ -z "${PASSWD_LIST}" ]; then
echo "need the encrypted file specified by PASSWD_LIST (in ~/.walletrc"
echo "or the envariable) or with the -c option"
exit 2
fi

if [ ! -f $PASSWD_LIST ]; then
echo "$PASSWD_LIST doesn't exist--attempting to create..."
echo "(you'll need to give gpg a master password in a moment)"
mkdir -p $( dirname ${PASSWD_LIST} )
TEMPFILE=$( mktemp /tmp/wallet.XXXXXX )
gpg -c -o ${PASSWD_LIST} ${TEMPFILE}
rm -f ${TEMPFILE}
EDIT_PWFILE=1
fi

# prompt the user for the password
PASSWORD=$( dialog --stdout --backtitle "Password Locker" \
--title "Master Password" --clear --passwordbox \
"Enter the Password Locker master password." 10 51 )
RETVAL=$?

case $RETVAL in
1)
  echo "Authentication Required!"
  exit 1;;
255)
  echo "Authentication Required!"
  exit 1;;
esac

# if we're not editing the file, just display it and quit
if [ $EDIT_PWFILE -eq 0 ]; then
echo $PASSWORD | gpg --decrypt --passphrase-fd 0 $PASSWD_LIST | less
clear
exit
fi

TMPDIR=$( mktemp -d /tmp/wallet.XXXXXX )
chmod 700 ${TMPDIR}
PASSWD_LIST_UNENCRYPTED=${TMPDIR}/wallet
# decrypt the password list
echo $PASSWORD | gpg -o $PASSWD_LIST_UNENCRYPTED --passphrase-fd 0 \
$PASSWD_LIST &> /dev/null
RETVAL=$?

# if decryption succeeded, open the password list in the editor
# and then re-encrypt it after the editor closes
case $RETVAL in
0)
  mv $PASSWD_LIST ${PASSWD_LIST}.bak
  ${VISUAL} $PASSWD_LIST_UNENCRYPTED 2> /dev/null;
  echo $PASSWORD | gpg -c -o $PASSWD_LIST --passphrase-fd 0 \
      $PASSWD_LIST_UNENCRYPTED &> /dev/null
  CRYPT_RETVAL=$?
  if [ $CRYPT_RETVAL -eq 0 ]; then
      rm -rf ${TMPDIR}
      clear
  else
      echo -n "gpg failed to encrypt your password file! "
      echo "Please fix the problem manually!"
      echo "unencrypted file at $PASSWD_LIST_UNENCRYPTED"
      exit 1
  fi;;
?)
  echo "error condition detected (invalid password?)"
  rm -rf ${TMPDIR}
  exit 1;;
esac