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hackacad/usr/local/share/bastille/rdr.sh
2021-01-05 18:24:02 -07:00

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#!/bin/sh
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# * Neither the name of the copyright holder nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
. /usr/local/share/bastille/common.sh
. /usr/local/etc/bastille/bastille.conf
usage() {
error_exit "Usage: bastille rdr TARGET [clear] | [list] | [tcp <host_port> <jail_port>] | [udp <host_port> <jail_port>]"
}
# Handle special-case commands first.
case "$1" in
help|-h|--help)
usage
;;
esac
if [ $# -lt 2 ]; then
usage
fi
TARGET="${1}"
shift
# Can only redirect to single jail
if [ "${TARGET}" = 'ALL' ]; then
error_exit "Can only redirect to a single jail."
fi
# Check jail name valid
JAIL_NAME=$(jls -j "${TARGET}" name 2>/dev/null)
if [ -z "${JAIL_NAME}" ]; then
error_exit "Jail not found: ${TARGET}"
fi
# Check jail ip4 address valid
if [ "$(bastille config $TARGET get vnet)" != 'enabled' ]; then
JAIL_IP=$(jls -j "${TARGET}" ip4.addr 2>/dev/null)
if [ -z "${JAIL_IP}" -o "${JAIL_IP}" = "-" ]; then
error_exit "Jail IP not found: ${TARGET}"
fi
fi
# Check rdr-anchor is setup in pf.conf
if ! (pfctl -sn | grep rdr-anchor | grep 'rdr/\*' >/dev/null); then
error_exit "rdr-anchor not found in pf.conf"
fi
# Check ext_if is setup in pf.conf
EXT_IF=$(grep '^[[:space:]]*ext_if[[:space:]]*=' /etc/pf.conf)
if [ -z "${JAIL_NAME}" ]; then
error_exit "ext_if not defined in pf.conf"
fi
while [ $# -gt 0 ]; do
case "$1" in
list)
pfctl -a "rdr/${JAIL_NAME}" -Psn 2>/dev/null
shift
;;
clear)
pfctl -a "rdr/${JAIL_NAME}" -Fn
shift
;;
tcp)
if [ $# -lt 3 ]; then
usage
fi
( pfctl -a "rdr/${JAIL_NAME}" -Psn;
printf '%s\nrdr pass on $ext_if inet proto tcp to port %s -> %s port %s\n' "$EXT_IF" "$2" "$JAIL_IP" "$3" ) \
| pfctl -a "rdr/${JAIL_NAME}" -f-
shift 3
;;
udp)
if [ $# -lt 3 ]; then
usage
fi
( pfctl -a "rdr/${JAIL_NAME}" -Psn;
printf '%s\nrdr pass on $ext_if inet proto udp to port %s -> %s port %s\n' "$EXT_IF" "$2" "$JAIL_IP" "$3" ) \
| pfctl -a "rdr/${JAIL_NAME}" -f-
shift 3
;;
*)
usage
;;
esac
done