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# $OpenBSD: forward-control.sh,v 1.4 2017/04/30 23:34:55 djm Exp $
# Placed in the Public Domain.
tid="sshd control of local and remote forwarding"
LFWD_PORT=3320
RFWD_PORT=3321
CTL=$OBJ/ctl-sock
READY=$OBJ/ready
wait_for_file_to_appear() {
_path=$1
_n=0
while test ! -e $_path ; do
test $_n -eq 1 && trace "waiting for $_path to appear"
_n=`expr $_n + 1`
test $_n -ge 10 && return 1
sleep 1
done
return 0
}
wait_for_process_to_exit() {
_pid=$1
_n=0
while kill -0 $_pid 2>/dev/null ; do
test $_n -eq 1 && trace "waiting for $_pid to exit"
_n=`expr $_n + 1`
test $_n -ge 10 && return 1
sleep 1
done
return 0
}
# usage: check_lfwd Y|N message
check_lfwd() {
_expected=$1
_message=$2
rm -f $READY
${SSH} -F $OBJ/ssh_proxy \
-L$LFWD_PORT:127.0.0.1:$PORT \
-o ExitOnForwardFailure=yes \
-n host "sleep 60 & echo \$! > $READY ; wait " \
>/dev/null 2>&1 &
_sshpid=$!
wait_for_file_to_appear $READY || \
fatal "check_lfwd ssh fail: $_message"
${SSH} -F $OBJ/ssh_config -p $LFWD_PORT \
-oConnectionAttempts=4 host true >/dev/null 2>&1
_result=$?
kill $_sshpid `cat $READY` 2>/dev/null
wait_for_process_to_exit $_sshpid
if test "x$_expected" = "xY" -a $_result -ne 0 ; then
fail "check_lfwd failed (expecting success): $_message"
elif test "x$_expected" = "xN" -a $_result -eq 0 ; then
fail "check_lfwd succeeded (expecting failure): $_message"
elif test "x$_expected" != "xY" -a "x$_expected" != "xN" ; then
fatal "check_lfwd invalid argument \"$_expected\""
else
verbose "check_lfwd done (expecting $_expected): $_message"
fi
}
# usage: check_rfwd Y|N message
check_rfwd() {
_expected=$1
_message=$2
rm -f $READY
${SSH} -F $OBJ/ssh_proxy \
-R$RFWD_PORT:127.0.0.1:$PORT \
-o ExitOnForwardFailure=yes \
-n host "sleep 60 & echo \$! > $READY ; wait " \
>/dev/null 2>&1 &
_sshpid=$!
wait_for_file_to_appear $READY
_result=$?
if test $_result -eq 0 ; then
${SSH} -F $OBJ/ssh_config -p $RFWD_PORT \
-oConnectionAttempts=4 host true >/dev/null 2>&1
_result=$?
kill $_sshpid `cat $READY` 2>/dev/null
wait_for_process_to_exit $_sshpid
fi
if test "x$_expected" = "xY" -a $_result -ne 0 ; then
fail "check_rfwd failed (expecting success): $_message"
elif test "x$_expected" = "xN" -a $_result -eq 0 ; then
fail "check_rfwd succeeded (expecting failure): $_message"
elif test "x$_expected" != "xY" -a "x$_expected" != "xN" ; then
fatal "check_rfwd invalid argument \"$_expected\""
else
verbose "check_rfwd done (expecting $_expected): $_message"
fi
}
start_sshd
cp ${OBJ}/sshd_proxy ${OBJ}/sshd_proxy.bak
cp ${OBJ}/authorized_keys_${USER} ${OBJ}/authorized_keys_${USER}.bak
# Sanity check: ensure the default config allows forwarding
check_lfwd Y "default configuration"
check_rfwd Y "default configuration"
# Usage: all_tests yes|local|remote|no Y|N Y|N Y|N Y|N Y|N Y|N
all_tests() {
_tcpfwd=$1
_plain_lfwd=$2
_plain_rfwd=$3
_nopermit_lfwd=$4
_nopermit_rfwd=$5
_permit_lfwd=$6
_permit_rfwd=$7
_badfwd=127.0.0.1:22
_goodfwd=127.0.0.1:${PORT}
cp ${OBJ}/authorized_keys_${USER}.bak ${OBJ}/authorized_keys_${USER}
_prefix="AllowTcpForwarding=$_tcpfwd"
# No PermitOpen
( cat ${OBJ}/sshd_proxy.bak ;
echo "AllowTcpForwarding $_tcpfwd" ) \
> ${OBJ}/sshd_proxy
check_lfwd $_plain_lfwd "$_prefix"
check_rfwd $_plain_rfwd "$_prefix"
# PermitOpen via sshd_config that doesn't match
( cat ${OBJ}/sshd_proxy.bak ;
echo "AllowTcpForwarding $_tcpfwd" ;
echo "PermitOpen $_badfwd" ) \
> ${OBJ}/sshd_proxy
check_lfwd $_nopermit_lfwd "$_prefix, !PermitOpen"
check_rfwd $_nopermit_rfwd "$_prefix, !PermitOpen"
# PermitOpen via sshd_config that does match
( cat ${OBJ}/sshd_proxy.bak ;
echo "AllowTcpForwarding $_tcpfwd" ;
echo "PermitOpen $_badfwd $_goodfwd" ) \
> ${OBJ}/sshd_proxy
# NB. permitopen via authorized_keys should have same
# success/fail as via sshd_config
# permitopen via authorized_keys that doesn't match
sed "s/^/permitopen=\"$_badfwd\" /" \
< ${OBJ}/authorized_keys_${USER}.bak \
> ${OBJ}/authorized_keys_${USER} || fatal "sed 1 fail"
( cat ${OBJ}/sshd_proxy.bak ;
echo "AllowTcpForwarding $_tcpfwd" ) \
> ${OBJ}/sshd_proxy
check_lfwd $_nopermit_lfwd "$_prefix, !permitopen"
check_rfwd $_nopermit_rfwd "$_prefix, !permitopen"
# permitopen via authorized_keys that does match
sed "s/^/permitopen=\"$_badfwd\",permitopen=\"$_goodfwd\" /" \
< ${OBJ}/authorized_keys_${USER}.bak \
> ${OBJ}/authorized_keys_${USER} || fatal "sed 2 fail"
( cat ${OBJ}/sshd_proxy.bak ;
echo "AllowTcpForwarding $_tcpfwd" ) \
> ${OBJ}/sshd_proxy
check_lfwd $_permit_lfwd "$_prefix, permitopen"
check_rfwd $_permit_rfwd "$_prefix, permitopen"
}
# no-permitopen mismatch-permitopen match-permitopen
# AllowTcpForwarding local remote local remote local remote
all_tests yes Y Y N Y Y Y
all_tests local Y N N N Y N
all_tests remote N Y N Y N Y
all_tests no N N N N N N
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