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- #!/bin/bash -e
- # vim: set tabstop=8 shiftwidth=4 softtabstop=4 expandtab smarttab colorcolumn=80:
- #
- # Copyright (c) 2017 Red Hat, Inc.
- # Author: Nathaniel McCallum <npmccallum@redhat.com>
- #
- # This program is free software: you can redistribute it and/or modify
- # it under the terms of the GNU General Public License as published by
- # the Free Software Foundation, either version 3 of the License, or
- # (at your option) any later version.
- #
- # This program is distributed in the hope that it will be useful,
- # but WITHOUT ANY WARRANTY; without even the implied warranty of
- # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- # GNU General Public License for more details.
- #
- # You should have received a copy of the GNU General Public License
- # along with this program. If not, see <http://www.gnu.org/licenses/>.
- #
- SUMMARY="Decrypts using the policy defined at encryption time"
- function findexe() {
- [ $# -eq 1 ] || return 1
- while read -r -d: path; do
- [ -f "$path/$1" ] && [ -x "$path/$1" ] && echo "$path/$1" && return 0
- done <<< "$PATH:"
- return 1
- }
- if [ $# -eq 1 ] && [ "$1" == "--summary" ]; then
- echo "$SUMMARY"
- exit 0
- fi
- if ! [ -t 0 ]; then
- read -r -d . hdr
- if ! pin="$(jose fmt -q "$hdr" -SyOg clevis -Og pin -Su-)"; then
- echo "JWE is missing the required 'clevis.pin' header property!" >&2
- exit 1
- fi
- if ! cmd="$(findexe clevis-decrypt-"$pin")"; then
- echo "Unable to locate pin '$pin'!" >&2
- exit 1
- fi
- exec "$cmd" < <(echo -n "$hdr."; /bin/cat)
- fi
- exec >&2
- echo
- echo "Usage: clevis decrypt < JWE > PLAINTEXT"
- echo
- echo "$SUMMARY"
- echo
- exit 2
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