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110 lines
2.5 KiB
Bash
110 lines
2.5 KiB
Bash
# $OpenBSD: dynamic-forward.sh,v 1.14 2023/01/02 07:03:57 djm Exp $
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# Placed in the Public Domain.
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tid="dynamic forwarding"
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FWDPORT=`expr $PORT + 1`
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cp $OBJ/ssh_config $OBJ/ssh_config.orig
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if have_prog nc && nc -h 2>&1 | grep "proxy address" >/dev/null; then
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proxycmd="nc -x 127.0.0.1:$FWDPORT -X"
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elif have_prog connect; then
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proxycmd="connect -S 127.0.0.1:$FWDPORT -"
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else
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echo "skipped (no suitable ProxyCommand found)"
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exit 0
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fi
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trace "will use ProxyCommand $proxycmd"
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start_ssh() {
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direction="$1"
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arg="$2"
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n=0
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error="1"
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trace "start dynamic -$direction forwarding, fork to background"
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(cat $OBJ/ssh_config.orig ; echo "$arg") > $OBJ/ssh_config
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while [ "$error" -ne 0 -a "$n" -lt 3 ]; do
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n=`expr $n + 1`
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${SSH} -F $OBJ/ssh_config -f -$direction $FWDPORT -q \
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-oExitOnForwardFailure=yes somehost exec sh -c \
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\'"echo \$\$ > $OBJ/remote_pid; exec sleep 444"\'
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error=$?
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if [ "$error" -ne 0 ]; then
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trace "forward failed attempt $n err $error"
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sleep $n
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fi
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done
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if [ "$error" -ne 0 ]; then
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fatal "failed to start dynamic forwarding"
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fi
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}
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stop_ssh() {
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if [ -f $OBJ/remote_pid ]; then
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remote=`cat $OBJ/remote_pid`
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trace "terminate remote shell, pid $remote"
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if [ $remote -gt 1 ]; then
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kill -HUP $remote
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fi
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else
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fail "no pid file: $OBJ/remote_pid"
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fi
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}
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check_socks() {
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direction=$1
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expect_success=$2
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for s in 4 5; do
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for h in 127.0.0.1 localhost; do
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trace "testing ssh socks version $s host $h (-$direction)"
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${SSH} -F $OBJ/ssh_config \
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-o "ProxyCommand ${proxycmd}${s} $h $PORT 2>/dev/null" \
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somehost cat ${DATA} > ${COPY}
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r=$?
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if [ "x$expect_success" = "xY" ] ; then
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if [ $r -ne 0 ] ; then
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fail "ssh failed with exit status $r"
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fi
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test -f ${COPY} || fail "failed copy ${DATA}"
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cmp ${DATA} ${COPY} || fail "corrupted copy of ${DATA}"
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elif [ $r -eq 0 ] ; then
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fail "ssh unexpectedly succeeded"
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fi
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done
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done
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}
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start_sshd
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for d in D R; do
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verbose "test -$d forwarding"
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start_ssh $d
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check_socks $d Y
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stop_ssh
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test "x$d" = "xR" || continue
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# Test PermitRemoteOpen
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verbose "PermitRemoteOpen=any"
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start_ssh $d PermitRemoteOpen=any
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check_socks $d Y
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stop_ssh
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verbose "PermitRemoteOpen=none"
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start_ssh $d PermitRemoteOpen=none
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check_socks $d N
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stop_ssh
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verbose "PermitRemoteOpen=explicit"
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start_ssh $d \
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PermitRemoteOpen="127.0.0.1:$PORT [::1]:$PORT localhost:$PORT"
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check_socks $d Y
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stop_ssh
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verbose "PermitRemoteOpen=disallowed"
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start_ssh $d \
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PermitRemoteOpen="127.0.0.1:1 [::1]:1 localhost:1"
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check_socks $d N
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stop_ssh
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done
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