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# Script to get password from plugin-runner to cryptroot-unlock
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# Copyright © 2018 Teddy Hogeborn
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# Copyright © 2018 Björn Påhlsson
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# This file is part of Mandos.
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# Mandos is free software: you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# Mandos is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with Mandos. If not, see <http://www.gnu.org/licenses/>.
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# Contact the authors at <mandos@recompile.se>.
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# This script is made to run in the initramfs, and must not be run in
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# the normal system environment.
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# Temporary file for the password
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passfile=$(mktemp -p /run -t mandos.XXXXXX)
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trap "rm -f -- $passfile 2>/dev/null" EXIT
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# Disable the plugins which conflict with "askpass" as distributed by
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cat <<-EOF >>/conf/conf.d/mandos/plugin-runner.conf
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--disable=askpass-fifo
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--disable=password-prompt
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# In case a password is retrieved by other means than by plugin-runner
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# (such as typing it on the console into the prompt given by the
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# "askpass" program), this dummy plugin will be made to exit
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# successfully, thereby forcing plugin-runner to stop all its plugins
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# and also exit itself.
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cat <<-EOF > /lib/mandos/plugins.d/dummy
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while [ -e /run/mandos-keep-running ]; do
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# exit successfully to force plugin-runner to finish
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chmod u=rwx,go=rx /lib/mandos/plugins.d/dummy
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# This file is the flag which keeps the dummy plugin running
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touch /run/mandos-keep-running
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# Keep running plugin-runner and trying any password, until either a
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# password is accepted by cryptroot-unlock, or plugin-runner fails, or
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# the file /run/mandos-keep-running has been removed.
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while command -v cryptroot-unlock >/dev/null 2>&1; do
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/lib/mandos/plugin-runner > "$passfile" &
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echo $! > /run/mandos-plugin-runner.pid
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# Try this password ten times (or ten seconds)
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for loop in 1 2 3 4 5 6 7 8 9 10; do
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if [ -e /run/mandos-keep-running ]; then
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cryptroot-unlock < "$passfile" >/dev/null 2>&1 && break 2
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rm -f /run/mandos-plugin-runner.pid /run/mandos-keep-running
added
removed
mandos-to-cryptroot-unlock
