mirror of
https://github.com/3proxy/3proxy.git
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daa0e36e41
tcppm and udppm forward a port each, so test both directions of each: a request through the TCP mapper reaching its target, a datagram through the UDP one coming back answered, and a mapper whose rules deny the client answering nothing. tlspr takes its destination from the name in the handshake, so point that name at 127.0.0.1 with nsrecord and give the certificate the same name: the name then both chooses where the request goes and is what the client checks. dnspr answers from its cache, including the documented 0.0.0.0 record, which is handed out as an address rather than withheld. auto is asked to serve an HTTP proxy request, SOCKS4, SOCKS5 and a TLS handshake on one port, and to make nothing of a request that is none of them. Its protocols reach different places, so there are two origins. The SOCKS UDP association was only checked for the port it binds. Send datagrams through it as well, large and small, and check a second association gets its own port - and that one bound inside an intport range still relays. A UDP service has no socket to connect to, so readiness is found by asking until it answers rather than racing it.
177 lines
6.2 KiB
Python
177 lines
6.2 KiB
Python
"""extport and intport: binding the local side of a connection to a range.
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Access rules accumulate until "flush": without it an earlier "allow *"
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matches first and the rule carrying the range is never reached.
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"""
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from harness import int_field
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def _windows():
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"""Pick port windows this platform will actually honour.
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On Linux the kernel applies IP_LOCAL_PORT_RANGE only within
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net.ipv4.ip_local_port_range; a window outside it is ignored and an
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ordinary ephemeral port is used, so a fixed low window would be
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measuring the kernel's own choice rather than the setting.
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"""
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try:
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with open("/proc/sys/net/ipv4/ip_local_port_range") as fp:
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low, high = (int(part) for part in fp.read().split()[:2])
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except (OSError, ValueError):
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return (21400, 21449), (21500, 21549)
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base = low + 1000 if low + 1150 <= high else low
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return (base, base + 49), (base + 100, base + 149)
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(LOW, HIGH), (ILOW, IHIGH) = _windows()
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# Privileged ports: the kernel ignores such a range on Linux, since it is
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# outside net.ipv4.ip_local_port_range, and binding them fails outright
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# without privileges. Either way nothing in the range can be taken, which
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# is the case the fallback exists for.
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UNHONOURED = (1, 99)
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def run(t):
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srv = t.free_port()
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prx = t.free_port()
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sks = t.free_port()
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meth = t.free_port()
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t.start("parent_ports", f"""
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log
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auth iponly
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allow *
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http * /echo* echo
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httpsrv -p{srv}
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# every outgoing connection binds inside the range
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flush
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auth iponly
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allow *
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parent 1000 extport 0.0.0.0 {LOW}-{HIGH}
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proxy -p{prx}
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# the range applies only to CONNECT: an HTTP proxy CONNECT is
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# HTTP_CONNECT, the bare CONNECT operation being the SOCKS one
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flush
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auth iponly
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allow * * * * HTTP_CONNECT
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parent 1000 extport 0.0.0.0 {LOW}-{HIGH}
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allow *
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proxy -p{meth}
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# socks, for the same setting on another service
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flush
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auth iponly
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allow *
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parent 1000 extport 0.0.0.0 {LOW}-{HIGH}
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socks -p{sks}
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""", ports=[srv, prx, sks, meth])
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origin = f"http://127.0.0.1:{srv}"
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proxy = f"127.0.0.1:{prx}"
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# --- extport ---------------------------------------------------------
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# the origin reports the source port it actually saw
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port = int_field(t.http(origin + "/echo", proxy=proxy), "peer.port")
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t.in_range(port, LOW, HIGH, "the outgoing connection binds inside the range")
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seen = []
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for _ in range(5):
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seen.append(int_field(t.http(origin + "/echo", proxy=proxy), "peer.port"))
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outside = [p for p in seen if p is None or not LOW <= p <= HIGH]
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t.eq([], outside, "repeated connections all bind inside the range")
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port = int_field(t.socks_http(f"127.0.0.1:{sks}", origin + "/echo"),
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"peer.port")
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t.in_range(port, LOW, HIGH,
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"socks binds the outgoing connection inside the range")
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# --- per-method scoping ------------------------------------------------
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method_proxy = f"127.0.0.1:{meth}"
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port = int_field(t.http(origin + "/echo", proxy=method_proxy, tunnel=True),
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"peer.port")
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t.in_range(port, LOW, HIGH, "CONNECT uses the range its rule sets")
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# a plain GET matches the later rule, which sets no range
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port = int_field(t.http(origin + "/echo", proxy=method_proxy), "peer.port")
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t.not_in_range(port, LOW, HIGH,
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"a method outside that rule keeps an ephemeral port")
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# --- a range the platform cannot honour --------------------------------
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# Linux ignores a range outside net.ipv4.ip_local_port_range, and any
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# platform can run out of free ports in a range. Either way the
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# connection falls back to an ephemeral port instead of failing.
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unhonoured = t.free_port()
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t.start("parent_unhonoured", f"""
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log
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flush
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auth iponly
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allow *
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parent 1000 extport 0.0.0.0 {UNHONOURED[0]}-{UNHONOURED[1]}
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proxy -p{unhonoured}
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""", ports=[unhonoured])
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r = t.http(origin + "/echo", proxy=f"127.0.0.1:{unhonoured}")
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t.eq(200, r.status, "a range the platform cannot honour still connects")
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t.ne(None, int_field(r, "peer.port"),
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"the connection still has a source port")
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# --- intport -----------------------------------------------------------
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# A UDP association allocates its socket after the destination is known,
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# so the range has to be applied when the rule matches rather than when
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# the chain is walked.
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udps = t.free_port()
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t.start("parent_intport", f"""
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log
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flush
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auth iponly
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allow *
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parent 1000 intport 0.0.0.0 {ILOW}-{IHIGH}
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socks -p{udps}
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""", ports=[udps])
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t.in_range(t.socks_udp_associate(udps), ILOW, IHIGH,
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"UDP ASSOCIATE binds inside the internal range")
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# and the association still carries traffic while bound in the range
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echo = t.udp_echo()
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reply, bound = t.socks_udp(f"127.0.0.1:{udps}", "127.0.0.1", echo, b"data")
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t.eq(b"echo:data", reply, "a range-bound association still relays")
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t.in_range(bound, ILOW, IHIGH, "and the port it relays from is in the range")
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# without a range the association still works, on an ephemeral port
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udps2 = t.free_port()
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t.start("parent_intport_none", f"""
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log
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flush
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auth iponly
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allow *
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socks -p{udps2}
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""", ports=[udps2])
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t.ne(None, t.socks_udp_associate(udps2),
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"UDP ASSOCIATE works without a range")
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# --- configuration errors ------------------------------------------------
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dead = t.free_port()
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t.contains(t.run_config("badaddr", f"""
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log
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allow *
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parent 1000 extport 127.0.0.1 {LOW}-{HIGH}
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proxy -p{dead}
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"""), "requires 0.0.0.0", "a non-zero address with extport is rejected")
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t.contains(t.run_config("badrange", f"""
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log
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allow *
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parent 1000 extport 0.0.0.0 notaport
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proxy -p{dead}
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"""), "bad port range", "a malformed range is rejected")
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t.contains(t.run_config("badorder", f"""
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log
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allow *
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parent 1000 extport 0.0.0.0 {HIGH}-{LOW}
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proxy -p{dead}
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"""), "bad port range", "a reversed range is rejected")
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