| | 1 | ### -*-sh-*- |
| | 2 | ### |
| | 3 | ### Common key management functions. |
| | 4 | ### |
| | 5 | ### (c) 2011 Mark Wooding |
| | 6 | ### |
| | 7 | |
| | 8 | ###----- Licensing notice --------------------------------------------------- |
| | 9 | ### |
| | 10 | ### This program is free software; you can redistribute it and/or modify |
| | 11 | ### it under the terms of the GNU General Public License as published by |
| | 12 | ### the Free Software Foundation; either version 2 of the License, or |
| | 13 | ### (at your option) any later version. |
| | 14 | ### |
| | 15 | ### This program is distributed in the hope that it will be useful, |
| | 16 | ### but WITHOUT ANY WARRANTY; without even the implied warranty of |
| | 17 | ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| | 18 | ### GNU General Public License for more details. |
| | 19 | ### |
| | 20 | ### You should have received a copy of the GNU General Public License |
| | 21 | ### along with this program; if not, write to the Free Software Foundation, |
| | 22 | ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| | 23 | |
| | 24 | quis=${0##*/} |
| | 25 | |
| | 26 | ###-------------------------------------------------------------------------- |
| | 27 | ### Configuration variables. |
| | 28 | |
| | 29 | PACKAGE="@PACKAGE@" VERSION="@VERSION@" |
| | 30 | pkgconfdir="@pkgconfdir@" pkglibdir="@pkglibdir@" |
| | 31 | bindir="@bindir@" |
| | 32 | |
| | 33 | case ":$PATH:" in *:"$bindir":*) ;; *) PATH=$bindir:$PATH ;; esac |
| | 34 | |
| | 35 | ###-------------------------------------------------------------------------- |
| | 36 | ### Cleanup handling. |
| | 37 | |
| | 38 | cleanups="" |
| | 39 | cleanup () { cleanups="$cleanups $1"; } |
| | 40 | trap 'rc=$?; for i in $cleanups; do $i; done; exit $rc' EXIT |
| | 41 | trap 'exit 127' INT TERM |
| | 42 | |
| | 43 | ###-------------------------------------------------------------------------- |
| | 44 | ### Utility functions. |
| | 45 | |
| | 46 | ## Temporary directory. |
| | 47 | unset tmp |
| | 48 | rmtmp () { cd /; rm -rf $tmp; } |
| | 49 | mktmp () { |
| | 50 | ## Make and return the name of a temporary directory. |
| | 51 | |
| | 52 | case "${tmp+t}" in t) echo "$tmp"; return ;; esac |
| | 53 | mem=$(userv root claim-mem-dir) |
| | 54 | tmp="$mem/keys.tmp.$$" |
| | 55 | rm -rf "$tmp" |
| | 56 | mkdir -m700 "$tmp" |
| | 57 | echo "$tmp" |
| | 58 | } |
| | 59 | |
| | 60 | ###-------------------------------------------------------------------------- |
| | 61 | ### Input validation functions. |
| | 62 | |
| | 63 | checknumber () { |
| | 64 | what=$1 thing=$2 |
| | 65 | case "$thing" in |
| | 66 | "" | [!1-9]* | *[!0-9]*) |
| | 67 | echo >&2 "$quis: bad $what \`$thing'" |
| | 68 | exit 1 |
| | 69 | ;; |
| | 70 | esac |
| | 71 | } |
| | 72 | |
| | 73 | checkword () { |
| | 74 | what=$1 thing=$2 |
| | 75 | case "$thing" in |
| | 76 | "" | *[!-0-9a-zA-Z_!%@+=]*) |
| | 77 | echo >&2 "$quis: bad $what: \`$thing'" |
| | 78 | exit 1 |
| | 79 | ;; |
| | 80 | esac |
| | 81 | } |
| | 82 | |
| | 83 | ###-------------------------------------------------------------------------- |
| | 84 | ### Crypto operations. |
| | 85 | ### |
| | 86 | ### We use Seccure for this, but it's interface is Very Annoying. |
| | 87 | |
| | 88 | run_seccure () { |
| | 89 | op=$1; shift |
| | 90 | ## run_seccure OP ARG ... |
| | 91 | ## |
| | 92 | ## Run a Seccure program, ensuring that its stderr is reported if it had |
| | 93 | ## anything very interesting to say, but suppressed if it was boring. |
| | 94 | |
| | 95 | ## We need a temporary place for the error output. |
| | 96 | case ${tmp+t} in |
| | 97 | t) ;; |
| | 98 | *) |
| | 99 | echo >&2 "$quis (INTERNAL): run_seccure called without tmpdir" |
| | 100 | exit 127 |
| | 101 | ;; |
| | 102 | esac |
| | 103 | |
| | 104 | ## Run the program. |
| | 105 | set +e; seccure-$op "$@" 2>$tmp/seccure.out; rc=$?; set -e |
| | 106 | grep -v '^WARNING: Cannot obtain memory lock' $tmp/seccure.out >&2 || : |
| | 107 | return $rc |
| | 108 | } |
| | 109 | |
| | 110 | ec_public () { |
| | 111 | private=$1 |
| | 112 | ## Write the public key corresponding to PRIVATE to stdout. |
| | 113 | |
| | 114 | run_seccure key -q -cp256 -F"$private" |
| | 115 | } |
| | 116 | |
| | 117 | ec_keygen () { |
| | 118 | private=$1 public=$2 |
| | 119 | ## Make a new key, write private key to PRIVATE and public key to PUBLIC. |
| | 120 | |
| | 121 | dd if=/dev/random bs=1 count=512 2>/dev/null | |
| | 122 | openssl sha384 -binary | |
| | 123 | (umask 077 && openssl base64 >"$private") |
| | 124 | ec_public "$private" >"$public" |
| | 125 | } |
| | 126 | |
| | 127 | ec_encrypt () { |
| | 128 | public=$1; shift |
| | 129 | ## Encrypt stuff using the PUBLIC key. Use -i/-o or redirection. |
| | 130 | |
| | 131 | run_seccure encrypt -q -cp256 -m128 "$@" -- $(cat "$public") |
| | 132 | } |
| | 133 | |
| | 134 | ec_decrypt () { |
| | 135 | private=$1; shift |
| | 136 | ## Decrypt stuff using the PRIVATE key. Use -i/-o or redirection. |
| | 137 | |
| | 138 | run_seccure decrypt -q -cp256 -m128 -F"$private" "$@" |
| | 139 | } |
| | 140 | |
| | 141 | ###-------------------------------------------------------------------------- |
| | 142 | ### Help text. |
| | 143 | |
| | 144 | dohelp () { |
| | 145 | case "$KEYS_HELP" in t) ;; *) return ;; esac |
| | 146 | help; exit |
| | 147 | } |
| | 148 | |
| | 149 | defhelp () { read umsg; usage="usage: $quis${umsg+ }$umsg"; help=$(cat); } |
| | 150 | help () { showhelp; } |
| | 151 | showhelp () { |
| | 152 | cat <<EOF |
| | 153 | $usage |
| | 154 | |
| | 155 | $help |
| | 156 | EOF |
| | 157 | } |
| | 158 | |
| | 159 | ###----- That's all, folks -------------------------------------------------- |
~mdw / distorted-keys / blame_incremental