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#!/bin/sh
DIVERTED_ASKPASS=${DIVERTED_ASKPASS:-/lib/cryptsetup/askpass.cryptsetup}
NUKE_PASSWORD_HASH_PATH=${NUKE_PASSWORD_HASH_PATH:-/etc/cryptsetup-nuke-password/password_hash}
CRYPT_HELPER=${CRYPT_HELPER:-/usr/lib/cryptsetup-nuke-password/crypt}
sanity_checks() {
local cryptsetup="$(which cryptsetup 2>/dev/null)"
if [ -z "$cryptsetup" ]; then
echo "$0: WARNING: cryptsetup not found in PATH" >&2
return 1
fi
if [ ! -e "$CRYPTTAB_SOURCE" ]; then
echo "$0: WARNING: \$CRYPTTAB_SOURCE (value: $CRYPTTAB_SOURCE) does not exist" >&2
return 1
fi
if [ ! -x "$CRYPT_HELPER" ]; then
echo "$0: WARNING: $CRYPT_HELPER is not executable" >&2
return 1
fi
return 0
}
hash_is_matching() {
local pass="$1"
local pass_hash
if [ ! -r $NUKE_PASSWORD_HASH_PATH ]; then
# No hash, no match
return 1
fi
pass_hash=$(cat $NUKE_PASSWORD_HASH_PATH)
if echo -n "$pass" | $CRYPT_HELPER --check "$pass_hash"; then
# User typed the nuke password!
return 0
else
return 1
fi
}
nuke_cryptsetup_partition() {
local partition="$1"
cryptsetup --batch-mode erase "$partition"
}
if [ ! -x "$DIVERTED_ASKPASS" ]; then
echo "ERROR: $DIVERTED_ASKPASS is not available/executable" >&2
exit 1
fi
PASSWORD=$($DIVERTED_ASKPASS "$1")
if sanity_checks && hash_is_matching "$PASSWORD"; then
nuke_cryptsetup_partition "$CRYPTTAB_SOURCE"
fi
# Forward the password
echo -n "$PASSWORD"
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