| 1 | #! /bin/sh |
| 2 | ### |
| 3 | ### Front-end for public-key operations |
| 4 | ### |
| 5 | ### (c) 2012 Mark Wooding |
| 6 | ### |
| 7 | |
| 8 | ###----- Licensing notice --------------------------------------------------- |
| 9 | ### |
| 10 | ### This file is part of the distorted.org.uk key management suite. |
| 11 | ### |
| 12 | ### distorted-keys is free software; you can redistribute it and/or modify |
| 13 | ### it under the terms of the GNU General Public License as published by |
| 14 | ### the Free Software Foundation; either version 2 of the License, or |
| 15 | ### (at your option) any later version. |
| 16 | ### |
| 17 | ### distorted-keys is distributed in the hope that it will be useful, |
| 18 | ### but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | ### GNU General Public License for more details. |
| 21 | ### |
| 22 | ### You should have received a copy of the GNU General Public License |
| 23 | ### along with distorted-keys; if not, write to the Free Software Foundation, |
| 24 | ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 25 | |
| 26 | set -e |
| 27 | : ${ETC=@pkgconfdir@} |
| 28 | : ${KEYS=@pkgstatedir@} |
| 29 | : ${KEYSLIB=@pkglibdir@} |
| 30 | export ETC KEYS KEYSLIB |
| 31 | |
| 32 | . "$KEYSLIB"/keyfunc.sh |
| 33 | |
| 34 | usage="COMMAND [ARGUMENTS ...]" |
| 35 | |
| 36 | ###-------------------------------------------------------------------------- |
| 37 | ### Common utilities. |
| 38 | |
| 39 | unpack () { |
| 40 | key=$1 |
| 41 | ## Unpack the KEY and set up to use it as a public key for future |
| 42 | ## operations. |
| 43 | |
| 44 | mktmp |
| 45 | exec 3<"$key" |
| 46 | |
| 47 | ## Read the properties. |
| 48 | endp=nil |
| 49 | while read line; do |
| 50 | case "$line" in ENDPROP) endp=t; break ;; esac |
| 51 | setprops "property" kprop_ "$line" |
| 52 | done <&3 |
| 53 | case $endp in |
| 54 | nil) echo >&2 "$quis: invalid public key (no ENDPROP line)"; exit 1 ;; |
| 55 | esac |
| 56 | checkprops "property" kprop_ "$g_props" |
| 57 | |
| 58 | ## Fetch the type-handling library. |
| 59 | if [ ! -f $KEYSLIB/ktype.$kprop_type ]; then |
| 60 | echo >&2 "$quis: unknown key type \`$kprop_type'" |
| 61 | exit 1 |
| 62 | fi |
| 63 | . $KEYSLIB/ktype.$kprop_type |
| 64 | checkprops "property" kprop_ "$k_props" |
| 65 | |
| 66 | ## Write the rest of the public key somewhere convenient. |
| 67 | mkdir $tmp/pubkey |
| 68 | cat <&3 >$tmp/pubkey/pub |
| 69 | k_import $tmp/pubkey |
| 70 | exec 3>&- |
| 71 | } |
| 72 | |
| 73 | ###-------------------------------------------------------------------------- |
| 74 | ### Commands. |
| 75 | |
| 76 | defcmd encrypt [-o CIPHERTEXT] KEY [MESSAGE] <<EOF |
| 77 | Encrypt the MESSAGE (default stdin) using the public key KEY. Write the |
| 78 | ciphertext to CIPHERTEXT (default stdout). |
| 79 | EOF |
| 80 | cmd_encrypt () { |
| 81 | unset out |
| 82 | while getopts "o:" opt; do |
| 83 | case $opt in |
| 84 | o) out=$OPTARG ;; |
| 85 | *) usage_err ;; |
| 86 | esac |
| 87 | done |
| 88 | shift $(( $OPTIND - 1 )) |
| 89 | case $# in |
| 90 | 1) ;; |
| 91 | 2) msg=$2; exec <"$msg" ;; |
| 92 | *) usage_err ;; |
| 93 | esac |
| 94 | key=$1 |
| 95 | unpack "$key" |
| 96 | case ${out+t} in |
| 97 | t) c_encrypt $tmp/pubkey - >"$out.new"; mv "$out.new" "$out" ;; |
| 98 | *) c_encrypt $tmp/pubkey - ;; |
| 99 | esac |
| 100 | } |
| 101 | |
| 102 | defcmd verify KEY SIGNATURE [MESSAGE] <<EOF |
| 103 | Verify a SIGNATURE (literal, not a filename) against a MESSAGE (default |
| 104 | stdin) using the public KEY. |
| 105 | EOF |
| 106 | cmd_verify () { |
| 107 | case $# in |
| 108 | 2) ;; |
| 109 | 3) msg=$3; exec <"$msg" ;; |
| 110 | *) usage_err ;; |
| 111 | esac |
| 112 | key=$1 sig=$2 |
| 113 | unpack "$key" |
| 114 | c_verify $tmp/pubkey - "$sig" |
| 115 | } |
| 116 | |
| 117 | ###-------------------------------------------------------------------------- |
| 118 | ### Main program. |
| 119 | |
| 120 | while getopts "hv" opt; do |
| 121 | case "$opt" in |
| 122 | h) do_help; exit ;; |
| 123 | v) version; exit ;; |
| 124 | *) usage_err ;; |
| 125 | esac |
| 126 | done |
| 127 | shift $(( $OPTIND - 1 )) |
| 128 | |
| 129 | case $# in 0) usage_err ;; esac |
| 130 | |
| 131 | dispatch "$@" |
| 132 | |
| 133 | ###----- That's all, folks -------------------------------------------------- |