73 lines
3.2 KiB
Bash
73 lines
3.2 KiB
Bash
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#!/bin/sh
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#################################################################
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# #
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# Copyright 2010 Fidelity Information Services, Inc #
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# #
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# This source code contains the intellectual property #
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# of its copyright holder(s), and is made available #
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# under a license. If you do not know the terms of #
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# the license, please stop and do not read further. #
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# #
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#################################################################
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#############################################################################################
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#
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# encrypt_db_key.sh - encrypts the symmetric database key with the recipient's public key.
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# The file is signed by the key provider.
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#
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# Arguments:
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# $1 - Input file with symmetric encryption key protected wiht user
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# $2 - Path of the output file.
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# $3 - Email address of the public key's owner.
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# Rest of line is comment for the output file
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#
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#############################################################################################
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hostos=`uname -s`
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# try to get a predictable which
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if [ "OS/390" = "$hostos" ] ; then which=whence ;
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elif [ -x "/usr/bin/which" ] ; then which=/usr/bin/which
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else which=which
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fi
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# echo and options
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ECHO=/bin/echo
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ECHO_OPTIONS=""
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#Linux honors escape sequence only when run with -e
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if [ "Linux" = "$hostos" ] ; then ECHO_OPTIONS="-e" ; fi
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# Input file, output file and recipient e-mail id are mandatory
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if [ $# -lt 3 ]; then
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$ECHO "Usage: `basename $0` input_key_file output_key_file recipient_id" ; exit 1
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fi
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# Identify GnuPG - it is required
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if [ -x "`$which gpg 2>&1`" ] ; then gpg=gpg
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elif [ -x "`$which gpg2 2>&1`" ] ; then gpg=gpg2
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else $ECHO "Able to find neither gpg nor gpg2. Exiting" ; exit 1 ; fi
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# Confirm existence of and ability to read input file
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if [ ! -r "$1" ] ; then $ECHO $1 does not exist or is not readable ; exit 1 ; fi
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input_file=$1
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# Confirm ability to create output file
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output_dir=`dirname $2` ; if [ -z "$output_dir" ] ; then output_dir=$PWD ; fi
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if [ ! -w $output_dir ] ; then $ECHO $output_dir does not exist or is not writable ; exit 1 ; fi
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if [ -f $2 ] ; then
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if [ ! -w $2 ] ; then $ECHO Unable to overwrite output file $2 ; exit 1 ; fi
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fi
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output_file=$2
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recipient=$3
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# Get comment for key, create default if none provided on command line
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shift 3
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comment="$*" ; if [ -z "$comment" ] ; then comment="$output_file created from $input_file for $recipient by $USER `date -u`" ; fi
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# Get passphrase for GnuPG keyring
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$ECHO $ECHO_OPTIONS Passphrase for keyring: \\c ; stty -echo ; read passphrase ; stty echo ; $ECHO ""
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# Yes, providing the passphrase on the command line to the second gpg command is not ideal, but that
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# but that is the best we can do with this reference implementation. Otherwise it must prompt twice.
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echo $passphrase | $gpg --batch --passphrase-fd 0 --quiet --decrypt $input_file | $gpg --encrypt --armor --sign --output $output_file --comment "$comment" --recipient $recipient --batch --passphrase "$passphrase"
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