# $OpenBSD: cfgmatch.sh,v 1.14 2024/09/27 01:05:54 djm Exp $ # Placed in the Public Domain. tid="sshd_config match" pidfile=$OBJ/remote_pid fwdport=3301 fwd="-L $fwdport:127.0.0.1:$PORT" echo "ExitOnForwardFailure=yes" >> $OBJ/ssh_config echo "ExitOnForwardFailure=yes" >> $OBJ/ssh_proxy start_client() { rm -f $pidfile ${SSH} -q $fwd "$@" somehost \ exec sh -c \'"echo \$\$ > $pidfile; exec sleep 100"\' \ >>$TEST_REGRESS_LOGFILE 2>&1 & client_pid=$! # Wait for remote end n=0 while test ! -f $pidfile ; do sleep 1 n=`expr $n + 1` if test $n -gt 60; then kill $client_pid fatal "timeout waiting for background ssh" fi done } stop_client() { pid=`cat $pidfile` if [ ! -z "$pid" ]; then kill $pid fi wait } cp $OBJ/sshd_proxy $OBJ/sshd_proxy_bak echo "PermitOpen 127.0.0.1:1 # comment" >>$OBJ/sshd_config echo "Match Address 127.0.0.1" >>$OBJ/sshd_config echo "PermitOpen 127.0.0.1:2 127.0.0.1:3 127.0.0.1:$PORT" >>$OBJ/sshd_config grep -v AuthorizedKeysFile $OBJ/sshd_proxy_bak > $OBJ/sshd_proxy echo "AuthorizedKeysFile /dev/null # comment" >>$OBJ/sshd_proxy echo "PermitOpen 127.0.0.1:1" >>$OBJ/sshd_proxy echo "Match user $USER" >>$OBJ/sshd_proxy echo "AuthorizedKeysFile /dev/null $OBJ/authorized_keys_%u" >>$OBJ/sshd_proxy echo "Match Address 127.0.0.1 # comment" >>$OBJ/sshd_proxy echo "PermitOpen 127.0.0.1:2 127.0.0.1:3 127.0.0.1:$PORT" >>$OBJ/sshd_proxy ${SUDO} ${SSHD} -f $OBJ/sshd_config -T >/dev/null || \ fail "config w/match fails config test" start_sshd # Test Match + PermitOpen in sshd_config. This should be permitted trace "match permitopen localhost" start_client -F $OBJ/ssh_config ${SSH} -q -p $fwdport -F $OBJ/ssh_config somehost true || \ fail "match permitopen permit" stop_client # Same but from different source. This should not be permitted trace "match permitopen proxy" start_client -F $OBJ/ssh_proxy ${SSH} -q -p $fwdport -F $OBJ/ssh_config somehost true && \ fail "match permitopen deny" stop_client # Retry previous with key option, should also be denied. cp /dev/null $OBJ/authorized_keys_$USER for t in ${SSH_KEYTYPES}; do printf 'permitopen="127.0.0.1:'$PORT'" ' >> $OBJ/authorized_keys_$USER cat $OBJ/$t.pub >> $OBJ/authorized_keys_$USER done trace "match permitopen proxy w/key opts" start_client -F $OBJ/ssh_proxy ${SSH} -q -p $fwdport -F $OBJ/ssh_config somehost true && \ fail "match permitopen deny w/key opt" stop_client # Test both sshd_config and key options permitting the same dst/port pair. # Should be permitted. trace "match permitopen localhost" start_client -F $OBJ/ssh_config ${SSH} -q -p $fwdport -F $OBJ/ssh_config somehost true || \ fail "match permitopen permit" stop_client cp $OBJ/sshd_proxy_bak $OBJ/sshd_proxy echo "PermitOpen 127.0.0.1:1 127.0.0.1:$PORT 127.0.0.2:2" >>$OBJ/sshd_proxy echo "Match User $USER" >>$OBJ/sshd_proxy echo "PermitOpen 127.0.0.1:1 127.0.0.1:2" >>$OBJ/sshd_proxy # Test that a Match overrides a PermitOpen in the global section trace "match permitopen proxy w/key opts" start_client -F $OBJ/ssh_proxy ${SSH} -q -p $fwdport -F $OBJ/ssh_config somehost true && \ fail "match override permitopen" stop_client cp $OBJ/sshd_proxy_bak $OBJ/sshd_proxy echo "PermitOpen 127.0.0.1:1 127.0.0.1:$PORT 127.0.0.2:2" >>$OBJ/sshd_proxy echo "Match User NoSuchUser" >>$OBJ/sshd_proxy echo "PermitOpen 127.0.0.1:1 127.0.0.1:2" >>$OBJ/sshd_proxy # Test that a rule that doesn't match doesn't override, plus test a # PermitOpen entry that's not at the start of the list trace "nomatch permitopen proxy w/key opts" start_client -F $OBJ/ssh_proxy ${SSH} -q -p $fwdport -F $OBJ/ssh_config somehost true || \ fail "nomatch override permitopen" stop_client # Test parsing of available Match criteria (with the exception of Group which # requires knowledge of actual group memberships user running the test). params="user:user:u1 host:host:h1 address:addr:1.2.3.4 \ localaddress:laddr:5.6.7.8 rdomain:rdomain:rdom1" for separator in " " "=" ; do cp $OBJ/sshd_proxy_bak $OBJ/sshd_config echo 'Banner /nomatch' >>$OBJ/sshd_config for i in $params; do config=`echo $i | cut -f1 -d:` criteria=`echo $i | cut -f2 -d:` value=`echo $i | cut -f3 -d:` cat >>$OBJ/sshd_config <<EOD Match ${config}${separator}${value} Banner /$value EOD done ${SUDO} ${SSHD} -f $OBJ/sshd_config -T >/dev/null || \ fail "validate config for w/out spec" # Test matching each criteria. for i in $params; do testcriteria=`echo $i | cut -f2 -d:` expected=/`echo $i | cut -f3 -d:` spec="" for j in $params; do config=`echo $j | cut -f1 -d:` criteria=`echo $j | cut -f2 -d:` value=`echo $j | cut -f3 -d:` if [ "$criteria" = "$testcriteria" ]; then spec="$criteria=$value,$spec" else spec="$criteria=1$value,$spec" fi done trace "test spec $spec" result=`${SUDO} ${SSHD} -f $OBJ/sshd_config -T -C "$spec" | \ awk '$1=="banner"{print $2}'` if [ "$result" != "$expected" ]; then fail "match $config expected $expected got $result" fi done done