- djm@cvs.openbsd.org 2012/12/02 20:47:48

[Makefile regress/forward-control.sh]
     regress for AllowTcpForwarding local/remote; ok markus@

ChangeLog

@@ -27,6 +27,9 @@
    - djm@cvs.openbsd.org 2012/11/22 22:49:30
      [regress/Makefile regress/keys-command.sh]
      regress for AuthorizedKeysCommand; hints from markus@
+   - djm@cvs.openbsd.org 2012/12/02 20:47:48
+     [Makefile regress/forward-control.sh]
+     regress for AllowTcpForwarding local/remote; ok markus@
 
 20121114
  - (djm) OpenBSD CVS Sync

regress/Makefile

@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile,v 1.59 2012/11/22 22:49:30 djm Exp $
+#	$OpenBSD: Makefile,v 1.60 2012/12/02 20:47:48 djm Exp $
 
 REGRESS_TARGETS=	t1 t2 t3 t4 t5 t6 t7 t8 t9 t-exec
 tests:		$(REGRESS_TARGETS)
@@ -58,7 +58,8 @@ LTESTS= 	connect \
 		cert-hostkey \
 		cert-userkey \
 		host-expand \
-		keys-command
+		keys-command \
+		forward-control
 
 INTEROP_TESTS=	putty-transfer putty-ciphers putty-kex conch-ciphers
 #INTEROP_TESTS+=ssh-com ssh-com-client ssh-com-keygen ssh-com-sftp
@@ -78,7 +79,9 @@ CLEANFILES=	t2.out t3.out t6.out1 t6.out2 t7.out t7.out.pub copy.1 copy.2 \
 		known_hosts-cert host_ca_key* cert_host_key* \
 		putty.rsa2 sshd_proxy_orig ssh_proxy_bak \
 		key.rsa-* key.dsa-* key.ecdsa-* \
-		authorized_principals_${USER} expect actual
+		authorized_principals_${USER} expect actual ready \
+		sshd_proxy.* authorized_keys_${USER}.*
+
 
 # Enable all malloc(3) randomisations and checks
 TEST_ENV=      "MALLOC_OPTIONS=AFGJPRX"

regress/forward-control.sh

@@ -0,0 +1,168 @@
+#	$OpenBSD: forward-control.sh,v 1.1 2012/12/02 20:47:48 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 5 && 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 5 && return 1
+		sleep 1
+	done
+	return 0
+}
+
+# usage: check_lfwd protocol Y|N message
+check_lfwd() {
+	_proto=$1
+	_expected=$2
+	_message=$3
+	rm -f $READY
+	${SSH} -oProtocol=$_proto -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 protocol Y|N message
+check_rfwd() {
+	_proto=$1
+	_expected=$2
+	_message=$3
+	rm -f $READY
+	${SSH} -oProtocol=$_proto -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
+for p in 1 2 ; do
+	check_lfwd $p Y "proto $p, default configuration"
+	check_rfwd $p Y "proto $p, default configuration"
+done
+
+# 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}
+	for _proto in 1 2 ; do
+		cp ${OBJ}/authorized_keys_${USER}.bak \
+		    ${OBJ}/authorized_keys_${USER}
+		_prefix="proto $_proto, AllowTcpForwarding=$_tcpfwd"
+		# No PermitOpen
+		( cat ${OBJ}/sshd_proxy.bak ;
+		  echo "AllowTcpForwarding $_tcpfwd" ) \
+		    > ${OBJ}/sshd_proxy
+		check_lfwd $_proto $_plain_lfwd "$_prefix"
+		check_rfwd $_proto $_plain_rfwd "$_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 $_proto $_nopermit_lfwd "$_prefix, !PermitOpen"
+		check_rfwd $_proto $_nopermit_rfwd "$_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 $_proto $_nopermit_lfwd "$_prefix, !permitopen"
+		check_rfwd $_proto $_nopermit_rfwd "$_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 $_proto $_permit_lfwd "$_prefix, permitopen"
+		check_rfwd $_proto $_permit_rfwd "$_prefix, permitopen"
+	done
+}
+
+#                      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