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236 lines
7.7 KiB
Bash
236 lines
7.7 KiB
Bash
# $OpenBSD: forward-control.sh,v 1.7 2018/06/07 14:29:43 djm Exp $
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# Placed in the Public Domain.
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tid="sshd control of local and remote forwarding"
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LFWD_PORT=3320
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RFWD_PORT=3321
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CTL=$OBJ/ctl-sock
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READY=$OBJ/ready
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wait_for_file_to_appear() {
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_path=$1
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_n=0
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while test ! -f $_path ; do
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test $_n -eq 1 && trace "waiting for $_path to appear"
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_n=`expr $_n + 1`
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test $_n -ge 20 && return 1
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sleep 1
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done
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return 0
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}
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wait_for_process_to_exit() {
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_pid=$1
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_n=0
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while kill -0 $_pid 2>/dev/null ; do
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test $_n -eq 1 && trace "waiting for $_pid to exit"
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_n=`expr $_n + 1`
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test $_n -ge 20 && return 1
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sleep 1
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done
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return 0
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}
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# usage: check_lfwd Y|N message
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check_lfwd() {
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_expected=$1
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_message=$2
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rm -f $READY
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${SSH} -F $OBJ/ssh_proxy \
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-L$LFWD_PORT:127.0.0.1:$PORT \
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-o ExitOnForwardFailure=yes \
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-n host exec sh -c \'"sleep 60 & echo \$! > $READY ; wait "\' \
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>/dev/null 2>&1 &
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_sshpid=$!
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wait_for_file_to_appear $READY || \
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fatal "check_lfwd ssh fail: $_message"
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${SSH} -F $OBJ/ssh_config -p $LFWD_PORT \
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-oConnectionAttempts=4 host true >/dev/null 2>&1
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_result=$?
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kill $_sshpid `cat $READY` 2>/dev/null
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wait_for_process_to_exit $_sshpid
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if test "x$_expected" = "xY" -a $_result -ne 0 ; then
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fail "check_lfwd failed (expecting success): $_message"
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elif test "x$_expected" = "xN" -a $_result -eq 0 ; then
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fail "check_lfwd succeeded (expecting failure): $_message"
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elif test "x$_expected" != "xY" -a "x$_expected" != "xN" ; then
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fatal "check_lfwd invalid argument \"$_expected\""
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else
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verbose "check_lfwd done (expecting $_expected): $_message"
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fi
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}
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# usage: check_rfwd Y|N message
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check_rfwd() {
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_expected=$1
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_message=$2
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rm -f $READY
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${SSH} -F $OBJ/ssh_proxy \
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-R127.0.0.1:$RFWD_PORT:127.0.0.1:$PORT \
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-o ExitOnForwardFailure=yes \
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-n host exec sh -c \'"sleep 60 & echo \$! > $READY ; wait "\' \
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>/dev/null 2>&1 &
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_sshpid=$!
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wait_for_file_to_appear $READY
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_result=$?
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if test $_result -eq 0 ; then
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${SSH} -F $OBJ/ssh_config -p $RFWD_PORT \
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-oConnectionAttempts=4 host true >/dev/null 2>&1
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_result=$?
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kill $_sshpid `cat $READY` 2>/dev/null
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wait_for_process_to_exit $_sshpid
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fi
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if test "x$_expected" = "xY" -a $_result -ne 0 ; then
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fail "check_rfwd failed (expecting success): $_message"
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elif test "x$_expected" = "xN" -a $_result -eq 0 ; then
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fail "check_rfwd succeeded (expecting failure): $_message"
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elif test "x$_expected" != "xY" -a "x$_expected" != "xN" ; then
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fatal "check_rfwd invalid argument \"$_expected\""
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else
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verbose "check_rfwd done (expecting $_expected): $_message"
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fi
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}
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start_sshd
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cp ${OBJ}/sshd_proxy ${OBJ}/sshd_proxy.bak
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cp ${OBJ}/authorized_keys_${USER} ${OBJ}/authorized_keys_${USER}.bak
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# Sanity check: ensure the default config allows forwarding
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check_lfwd Y "default configuration"
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check_rfwd Y "default configuration"
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# Usage: lperm_tests yes|local|remote|no Y|N Y|N Y|N Y|N Y|N Y|N
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lperm_tests() {
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_tcpfwd=$1
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_plain_lfwd=$2
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_plain_rfwd=$3
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_nopermit_lfwd=$4
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_nopermit_rfwd=$5
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_permit_lfwd=$6
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_permit_rfwd=$7
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_badfwd1=127.0.0.1:22
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_badfwd2=127.0.0.2:22
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_goodfwd=127.0.0.1:${PORT}
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cp ${OBJ}/authorized_keys_${USER}.bak ${OBJ}/authorized_keys_${USER}
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_prefix="AllowTcpForwarding=$_tcpfwd"
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# No PermitOpen
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( cat ${OBJ}/sshd_proxy.bak ;
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echo "AllowTcpForwarding $_tcpfwd" ) \
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> ${OBJ}/sshd_proxy
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check_lfwd $_plain_lfwd "$_prefix"
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check_rfwd $_plain_rfwd "$_prefix"
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# PermitOpen via sshd_config that doesn't match
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( cat ${OBJ}/sshd_proxy.bak ;
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echo "AllowTcpForwarding $_tcpfwd" ;
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echo "PermitOpen $_badfwd1 $_badfwd2" ) \
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> ${OBJ}/sshd_proxy
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check_lfwd $_nopermit_lfwd "$_prefix, !PermitOpen"
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check_rfwd $_nopermit_rfwd "$_prefix, !PermitOpen"
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# PermitOpen via sshd_config that does match
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( cat ${OBJ}/sshd_proxy.bak ;
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echo "AllowTcpForwarding $_tcpfwd" ;
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echo "PermitOpen $_badfwd1 $_goodfwd $_badfwd2" ) \
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> ${OBJ}/sshd_proxy
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check_lfwd $_plain_lfwd "$_prefix, PermitOpen"
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check_rfwd $_plain_rfwd "$_prefix, PermitOpen"
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# permitopen keys option.
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# NB. permitopen via authorized_keys should have same
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# success/fail as via sshd_config
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# permitopen via authorized_keys that doesn't match
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sed "s/^/permitopen=\"$_badfwd1\",permitopen=\"$_badfwd2\" /" \
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< ${OBJ}/authorized_keys_${USER}.bak \
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> ${OBJ}/authorized_keys_${USER} || fatal "sed 1 fail"
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( cat ${OBJ}/sshd_proxy.bak ;
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echo "AllowTcpForwarding $_tcpfwd" ) \
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> ${OBJ}/sshd_proxy
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check_lfwd $_nopermit_lfwd "$_prefix, !permitopen"
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check_rfwd $_nopermit_rfwd "$_prefix, !permitopen"
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# permitopen via authorized_keys that does match
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sed "s/^/permitopen=\"$_badfwd1\",permitopen=\"$_goodfwd\" /" \
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< ${OBJ}/authorized_keys_${USER}.bak \
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> ${OBJ}/authorized_keys_${USER} || fatal "sed 2 fail"
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( cat ${OBJ}/sshd_proxy.bak ;
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echo "AllowTcpForwarding $_tcpfwd" ) \
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> ${OBJ}/sshd_proxy
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check_lfwd $_permit_lfwd "$_prefix, permitopen"
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check_rfwd $_permit_rfwd "$_prefix, permitopen"
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# Check port-forwarding flags in authorized_keys.
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# These two should refuse all.
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sed "s/^/no-port-forwarding /" \
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< ${OBJ}/authorized_keys_${USER}.bak \
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> ${OBJ}/authorized_keys_${USER} || fatal "sed 3 fail"
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( cat ${OBJ}/sshd_proxy.bak ;
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echo "AllowTcpForwarding $_tcpfwd" ) \
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> ${OBJ}/sshd_proxy
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check_lfwd N "$_prefix, no-port-forwarding"
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check_rfwd N "$_prefix, no-port-forwarding"
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sed "s/^/restrict /" \
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< ${OBJ}/authorized_keys_${USER}.bak \
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> ${OBJ}/authorized_keys_${USER} || fatal "sed 4 fail"
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( cat ${OBJ}/sshd_proxy.bak ;
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echo "AllowTcpForwarding $_tcpfwd" ) \
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> ${OBJ}/sshd_proxy
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check_lfwd N "$_prefix, restrict"
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check_rfwd N "$_prefix, restrict"
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# This should pass the same cases as _nopermit*
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sed "s/^/restrict,port-forwarding /" \
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< ${OBJ}/authorized_keys_${USER}.bak \
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> ${OBJ}/authorized_keys_${USER} || fatal "sed 5 fail"
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( cat ${OBJ}/sshd_proxy.bak ;
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echo "AllowTcpForwarding $_tcpfwd" ) \
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> ${OBJ}/sshd_proxy
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check_lfwd $_plain_lfwd "$_prefix, restrict,port-forwarding"
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check_rfwd $_plain_rfwd "$_prefix, restrict,port-forwarding"
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}
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# permit-open none mismatch match
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# AllowTcpForwarding local remote local remote local remote
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lperm_tests yes Y Y N Y Y Y
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lperm_tests local Y N N N Y N
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lperm_tests remote N Y N Y N Y
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lperm_tests no N N N N N N
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# Usage: rperm_tests yes|local|remote|no Y|N Y|N Y|N Y|N Y|N Y|N
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rperm_tests() {
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_tcpfwd=$1
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_plain_lfwd=$2
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_plain_rfwd=$3
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_nopermit_lfwd=$4
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_nopermit_rfwd=$5
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_permit_lfwd=$6
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_permit_rfwd=$7
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_badfwd1=127.0.0.1:22
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_badfwd2=127.0.0.2:${RFWD_PORT}
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_goodfwd=127.0.0.1:${RFWD_PORT}
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cp ${OBJ}/authorized_keys_${USER}.bak ${OBJ}/authorized_keys_${USER}
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_prefix="AllowTcpForwarding=$_tcpfwd"
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# PermitListen via sshd_config that doesn't match
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( cat ${OBJ}/sshd_proxy.bak ;
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echo "AllowTcpForwarding $_tcpfwd" ;
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echo "PermitListen $_badfwd1 $_badfwd2" ) \
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> ${OBJ}/sshd_proxy
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check_lfwd $_nopermit_lfwd "$_prefix, !PermitListen"
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check_rfwd $_nopermit_rfwd "$_prefix, !PermitListen"
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# PermitListen via sshd_config that does match
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( cat ${OBJ}/sshd_proxy.bak ;
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echo "AllowTcpForwarding $_tcpfwd" ;
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echo "PermitListen $_badfwd1 $_goodfwd $_badfwd2" ) \
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> ${OBJ}/sshd_proxy
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check_lfwd $_plain_lfwd "$_prefix, PermitListen"
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check_rfwd $_plain_rfwd "$_prefix, PermitListen"
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}
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# permit-remote-open none mismatch match
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# AllowTcpForwarding local remote local remote local remote
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rperm_tests yes Y Y Y N Y Y
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rperm_tests local Y N Y N Y N
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rperm_tests remote N Y N N N Y
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rperm_tests no N N N N N N
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