| 1 | ### -*-sh-*- |
| 2 | ### |
| 3 | ### Common key management functions. |
| 4 | ### |
| 5 | ### (c) 2011 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 | quis=${0##*/} |
| 27 | |
| 28 | ###-------------------------------------------------------------------------- |
| 29 | ### Configuration variables. |
| 30 | |
| 31 | PACKAGE="@PACKAGE@" VERSION="@VERSION@" |
| 32 | pkgconfdir="@pkgconfdir@" pkglibdir="@pkglibdir@" |
| 33 | bindir="@bindir@" |
| 34 | |
| 35 | case ":$PATH:" in *:"$bindir":*) ;; *) PATH=$bindir:$PATH ;; esac |
| 36 | |
| 37 | if [ -f $KEYS/keys.conf ]; then . $KEYS/keys.conf; fi |
| 38 | : ${random=/dev/random} |
| 39 | |
| 40 | case "${KEYS_DEBUG+t}" in t) set -x ;; esac |
| 41 | |
| 42 | ###-------------------------------------------------------------------------- |
| 43 | ### Cleanup handling. |
| 44 | |
| 45 | cleanups="" |
| 46 | cleanup () { cleanups="$cleanups $1"; } |
| 47 | trap 'rc=$?; for i in $cleanups; do $i; done; exit $rc' EXIT |
| 48 | trap 'exit 127' INT TERM |
| 49 | |
| 50 | ###-------------------------------------------------------------------------- |
| 51 | ### Utility functions. |
| 52 | |
| 53 | ## Temporary directory. |
| 54 | unset tmp |
| 55 | rmtmp () { cd /; rm -rf $tmp; } |
| 56 | mktmp () { |
| 57 | ## Make and return the name of a temporary directory. |
| 58 | |
| 59 | case "${tmp+t}" in t) echo "$tmp"; return ;; esac |
| 60 | mem=$(userv root claim-mem-dir </dev/null) |
| 61 | tmp="$mem/keys.tmp.$$" |
| 62 | rm -rf "$tmp" |
| 63 | mkdir -m700 "$tmp" |
| 64 | echo "$tmp" |
| 65 | } |
| 66 | |
| 67 | ###-------------------------------------------------------------------------- |
| 68 | ### Input validation functions. |
| 69 | |
| 70 | checknumber () { |
| 71 | what=$1 thing=$2 |
| 72 | case "$thing" in |
| 73 | "" | [!1-9]* | *[!0-9]*) |
| 74 | echo >&2 "$quis: bad $what \`$thing'" |
| 75 | exit 1 |
| 76 | ;; |
| 77 | esac |
| 78 | } |
| 79 | |
| 80 | checkword () { |
| 81 | what=$1 thing=$2 |
| 82 | case "$thing" in |
| 83 | "" | *[!-0-9a-zA-Z_!%@+=]*) |
| 84 | echo >&2 "$quis: bad $what: \`$thing'" |
| 85 | exit 1 |
| 86 | ;; |
| 87 | esac |
| 88 | } |
| 89 | |
| 90 | checklabel () { |
| 91 | what=$1 thing=$2 |
| 92 | case "$thing" in |
| 93 | *[!-0-9a-zA-Z_!%@+=/#]* | *//* | /* | */) |
| 94 | echo >&2 "$quis: bad $what label \`$thing'" |
| 95 | exit 1 |
| 96 | ;; |
| 97 | esac |
| 98 | } |
| 99 | |
| 100 | ###-------------------------------------------------------------------------- |
| 101 | ### Crypto operations. |
| 102 | ### |
| 103 | ### We use Seccure for this, but it's interface is Very Annoying. |
| 104 | |
| 105 | run_seccure () { |
| 106 | op=$1; shift |
| 107 | ## run_seccure OP ARG ... |
| 108 | ## |
| 109 | ## Run a Seccure program, ensuring that its stderr is reported if it had |
| 110 | ## anything very interesting to say, but suppressed if it was boring. |
| 111 | |
| 112 | ## We need a temporary place for the error output. |
| 113 | case ${tmp+t} in |
| 114 | t) ;; |
| 115 | *) |
| 116 | echo >&2 "$quis (INTERNAL): run_seccure called without tmpdir" |
| 117 | exit 127 |
| 118 | ;; |
| 119 | esac |
| 120 | |
| 121 | ## Run the program. |
| 122 | set +e; seccure-$op "$@" 2>$tmp/seccure.out; rc=$?; set -e |
| 123 | grep -v '^WARNING: Cannot obtain memory lock' $tmp/seccure.out >&2 || : |
| 124 | return $rc |
| 125 | } |
| 126 | |
| 127 | ec_public () { |
| 128 | private=$1 |
| 129 | ## Write the public key corresponding to PRIVATE to stdout. |
| 130 | |
| 131 | run_seccure key -q -cp256 -F"$private" |
| 132 | } |
| 133 | |
| 134 | ec_keygen () { |
| 135 | private=$1 public=$2 |
| 136 | ## Make a new key, write private key to PRIVATE and public key to PUBLIC. |
| 137 | |
| 138 | dd if=$random bs=1 count=512 2>/dev/null | |
| 139 | openssl dgst -sha384 -binary | |
| 140 | (umask 077 && openssl base64 >"$private") |
| 141 | ec_public "$private" >"$public" |
| 142 | } |
| 143 | |
| 144 | ec_encrypt () { |
| 145 | public=$1; shift |
| 146 | ## Encrypt stuff using the PUBLIC key. Use -i/-o or redirection. |
| 147 | |
| 148 | run_seccure encrypt -q -cp256 -m128 "$@" -- $(cat "$public") |
| 149 | } |
| 150 | |
| 151 | ec_decrypt () { |
| 152 | private=$1; shift |
| 153 | ## Decrypt stuff using the PRIVATE key. Use -i/-o or redirection. |
| 154 | |
| 155 | run_seccure decrypt -q -cp256 -m128 -F"$private" "$@" |
| 156 | } |
| 157 | |
| 158 | ec_sign () { |
| 159 | private=$1; shift |
| 160 | ## Sign stuff using the PRIVATE key. Use -i/-o or redirection. |
| 161 | |
| 162 | run_seccure sign -q -cp256 -F"$private" "$@" |
| 163 | } |
| 164 | |
| 165 | ec_verify () { |
| 166 | public=$1 signature=$2; shift |
| 167 | ## Verify a SIGNATURE using the PUBLIC key; use -i or redirection for the |
| 168 | ## input. |
| 169 | |
| 170 | run_seccure verify -q -cp256 "$@" -- $(cat "$public") "$signature" |
| 171 | } |
| 172 | |
| 173 | ###-------------------------------------------------------------------------- |
| 174 | ### Help text. |
| 175 | |
| 176 | dohelp () { |
| 177 | case "$KEYS_HELP" in t) ;; *) return ;; esac |
| 178 | help; exit |
| 179 | } |
| 180 | |
| 181 | defhelp () { read umsg; usage="usage: $quis${umsg+ }$umsg"; help=$(cat); } |
| 182 | help () { showhelp; } |
| 183 | showhelp () { |
| 184 | cat <<EOF |
| 185 | $usage |
| 186 | |
| 187 | $help |
| 188 | EOF |
| 189 | } |
| 190 | |
| 191 | ###----- That's all, folks -------------------------------------------------- |