382 lines
12 KiB
C
382 lines
12 KiB
C
/*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright 2021 Lutz Donnerhacke
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <atf-c.h>
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#include <alias.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "util.h"
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ATF_TC_WITHOUT_HEAD(1_portforward);
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ATF_TC_BODY(1_portforward, dummy)
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{
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struct libalias *la = LibAliasInit(NULL);
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struct alias_link *pf1, *pf2, *pf3, *pf4;
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struct ip *p;
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struct udphdr *u;
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ATF_REQUIRE(la != NULL);
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LibAliasSetAddress(la, masq);
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LibAliasSetMode(la, PKT_ALIAS_RESET_ON_ADDR_CHANGE, ~0);
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LibAliasSetMode(la, PKT_ALIAS_DENY_INCOMING, PKT_ALIAS_DENY_INCOMING);
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/*
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* Fully specified
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*/
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pf1 = LibAliasRedirectPort(la, prv1, ntohs(0x1234), ext, ntohs(0x5678), masq, ntohs(0xabcd), IPPROTO_UDP);
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ATF_REQUIRE(pf1 != NULL);
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p = ip_packet(0, 64);
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UDP_UNNAT_CHECK(p, u, ext, 0x5678, masq, 0xabcd, prv1, 0x1234);
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/* try again */
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UDP_UNNAT_CHECK(p, u, ext, 0x5678, masq, 0xabcd, prv1, 0x1234);
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/* different source */
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UDP_UNNAT_FAIL(p, u, pub, 0x5678, masq, 0xabcd);
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UDP_UNNAT_FAIL(p, u, ext, 0xdead, masq, 0xabcd);
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/* clear table by keeping the address */
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LibAliasSetAddress(la, ext);
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LibAliasSetAddress(la, masq);
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/* delete and try again */
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LibAliasRedirectDelete(la, pf1);
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UDP_UNNAT_FAIL(p, u, ext, 0x5678, masq, 0xabcd);
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/*
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* Any external port
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*/
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pf2 = LibAliasRedirectPort(la, prv2, ntohs(0x1234), ext, ntohs(0), masq, ntohs(0xabcd), IPPROTO_UDP);
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ATF_REQUIRE(pf2 != NULL);
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UDP_UNNAT_CHECK(p, u, ext, 0x5678, masq, 0xabcd, prv2, 0x1234);
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/* try again */
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UDP_UNNAT_CHECK(p, u, ext, 0x5678, masq, 0xabcd, prv2, 0x1234);
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/* different source */
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UDP_UNNAT_FAIL(p, u, pub, 0x5678, masq, 0xabcd);
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UDP_UNNAT_CHECK(p, u, ext, 0xdead, masq, 0xabcd, prv2, 0x1234);
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/* clear table by keeping the address */
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LibAliasSetAddress(la, ext);
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LibAliasSetAddress(la, masq);
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/* delete and try again */
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LibAliasRedirectDelete(la, pf2);
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UDP_UNNAT_FAIL(p, u, ext, 0x5678, masq, 0xabcd);
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/*
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* Any external host
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*/
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pf3 = LibAliasRedirectPort(la, prv3, ntohs(0x1234), ANY_ADDR, ntohs(0x5678), masq, ntohs(0xabcd), IPPROTO_UDP);
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ATF_REQUIRE(pf3 != NULL);
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UDP_UNNAT_CHECK(p, u, ext, 0x5678, masq, 0xabcd, prv3, 0x1234);
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/* try again */
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UDP_UNNAT_CHECK(p, u, ext, 0x5678, masq, 0xabcd, prv3, 0x1234);
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/* different source */
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UDP_UNNAT_CHECK(p, u, pub, 0x5678, masq, 0xabcd, prv3, 0x1234);
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UDP_UNNAT_FAIL(p, u, ext, 0xdead, masq, 0xabcd);
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/* clear table by keeping the address */
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LibAliasSetAddress(la, ext);
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LibAliasSetAddress(la, masq);
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/* delete and try again */
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LibAliasRedirectDelete(la, pf3);
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UDP_UNNAT_FAIL(p, u, ext, 0x5678, masq, 0xabcd);
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/*
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* Any external host, any port
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*/
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pf4 = LibAliasRedirectPort(la, cgn, ntohs(0x1234), ANY_ADDR, ntohs(0), masq, ntohs(0xabcd), IPPROTO_UDP);
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ATF_REQUIRE(pf4 != NULL);
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UDP_UNNAT_CHECK(p, u, ext, 0x5678, masq, 0xabcd, cgn, 0x1234);
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/* try again */
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UDP_UNNAT_CHECK(p, u, ext, 0x5678, masq, 0xabcd, cgn, 0x1234);
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/* different source */
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UDP_UNNAT_CHECK(p, u, pub, 0x5678, masq, 0xabcd, cgn, 0x1234);
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UDP_UNNAT_CHECK(p, u, ext, 0xdead, masq, 0xabcd, cgn, 0x1234);
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/* clear table by keeping the address */
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LibAliasSetAddress(la, ext);
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LibAliasSetAddress(la, masq);
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/* delete and try again */
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LibAliasRedirectDelete(la, pf4);
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UDP_UNNAT_FAIL(p, u, ext, 0x5678, masq, 0xabcd);
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free(p);
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LibAliasUninit(la);
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}
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ATF_TC_WITHOUT_HEAD(2_portoverlap);
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ATF_TC_BODY(2_portoverlap, dummy)
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{
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struct libalias *la = LibAliasInit(NULL);
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struct alias_link *pf1, *pf2, *pf3, *pf4;
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struct ip *p;
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struct udphdr *u;
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ATF_REQUIRE(la != NULL);
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LibAliasSetAddress(la, masq);
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LibAliasSetMode(la, PKT_ALIAS_RESET_ON_ADDR_CHANGE, ~0);
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LibAliasSetMode(la, PKT_ALIAS_DENY_INCOMING, PKT_ALIAS_DENY_INCOMING);
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/*
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* Fully specified
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*/
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pf1 = LibAliasRedirectPort(la, prv2, ntohs(0x1234), ext, ntohs(0x5678), masq, ntohs(0xabcd), IPPROTO_UDP);
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ATF_REQUIRE(pf1 != NULL);
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p = ip_packet(0, 64);
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UDP_UNNAT_CHECK(p, u, ext, 0x5678, masq, 0xabcd, prv2, 0x1234);
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/* clear table by keeping the address */
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LibAliasSetAddress(la, ext);
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LibAliasSetAddress(la, masq);
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/*
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* Fully specified (override)
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*/
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pf1 = LibAliasRedirectPort(la, prv1, ntohs(0x1234), ext, ntohs(0x5678), masq, ntohs(0xabcd), IPPROTO_UDP);
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ATF_REQUIRE(pf1 != NULL);
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UDP_UNNAT_CHECK(p, u, ext, 0x5678, masq, 0xabcd, prv1, 0x1234);
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/* clear table by keeping the address */
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LibAliasSetAddress(la, ext);
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LibAliasSetAddress(la, masq);
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/*
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* Any external port
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*/
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pf2 = LibAliasRedirectPort(la, prv2, ntohs(0x1234), ext, ntohs(0), masq, ntohs(0xabcd), IPPROTO_UDP);
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ATF_REQUIRE(pf2 != NULL);
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UDP_UNNAT_CHECK(p, u, ext, 0x5679, masq, 0xabcd, prv2, 0x1234);
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/* more specific rule wins */
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UDP_UNNAT_CHECK(p, u, ext, 0x5678, masq, 0xabcd, prv1, 0x1234);
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/* clear table by keeping the address */
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LibAliasSetAddress(la, ext);
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LibAliasSetAddress(la, masq);
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/*
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* Any external host
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*/
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pf3 = LibAliasRedirectPort(la, prv3, ntohs(0x1234), ANY_ADDR, ntohs(0x5678), masq, ntohs(0xabcd), IPPROTO_UDP);
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ATF_REQUIRE(pf3 != NULL);
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UDP_UNNAT_CHECK(p, u, pub, 0x5678, masq, 0xabcd, prv3, 0x1234);
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/* more specific rule wins */
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UDP_UNNAT_CHECK(p, u, ext, 0x5679, masq, 0xabcd, prv2, 0x1234);
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UDP_UNNAT_CHECK(p, u, ext, 0x5678, masq, 0xabcd, prv1, 0x1234);
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/* clear table by keeping the address */
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LibAliasSetAddress(la, ext);
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LibAliasSetAddress(la, masq);
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/*
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* Any external host, any port
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*/
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pf4 = LibAliasRedirectPort(la, cgn, ntohs(0x1234), ANY_ADDR, ntohs(0), masq, ntohs(0xabcd), IPPROTO_UDP);
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ATF_REQUIRE(pf4 != NULL);
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UDP_UNNAT_CHECK(p, u, prv1, 0x5679, masq, 0xabcd, cgn, 0x1234);
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/* more specific rule wins */
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UDP_UNNAT_CHECK(p, u, pub, 0x5678, masq, 0xabcd, prv3, 0x1234);
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UDP_UNNAT_CHECK(p, u, ext, 0x5679, masq, 0xabcd, prv2, 0x1234);
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UDP_UNNAT_CHECK(p, u, ext, 0x5678, masq, 0xabcd, prv1, 0x1234);
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free(p);
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LibAliasUninit(la);
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}
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ATF_TC_WITHOUT_HEAD(3_redirectany);
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ATF_TC_BODY(3_redirectany, dummy)
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{
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struct libalias *la = LibAliasInit(NULL);
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struct alias_link *pf;
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struct ip *p;
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struct udphdr *u;
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ATF_REQUIRE(la != NULL);
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LibAliasSetMode(la, PKT_ALIAS_DENY_INCOMING, ~0);
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p = ip_packet(0, 64);
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pf = LibAliasRedirectPort(la, prv1, ntohs(0x1234), ANY_ADDR, 0, ANY_ADDR, ntohs(0xabcd), IPPROTO_UDP);
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ATF_REQUIRE(pf != NULL);
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LibAliasSetAddress(la, masq);
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UDP_UNNAT_CHECK(p, u, ext, 0x5678, masq, 0xabcd, prv1, 0x1234);
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UDP_UNNAT_FAIL(p, u, pub, 0x5678, pub, 0xabcd);
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LibAliasSetAddress(la, pub);
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UDP_UNNAT_CHECK(p, u, pub, 0x5679, pub, 0xabcd, prv1, 0x1234);
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UDP_UNNAT_FAIL(p, u, ext, 0x5679, masq, 0xabcd);
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free(p);
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LibAliasUninit(la);
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}
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ATF_TC_WITHOUT_HEAD(4_redirectaddr);
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ATF_TC_BODY(4_redirectaddr, dummy)
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{
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struct libalias *la = LibAliasInit(NULL);
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struct alias_link *pf1, *pf2;
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struct ip *p;
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ATF_REQUIRE(la != NULL);
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LibAliasSetAddress(la, masq);
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pf1 = LibAliasRedirectAddr(la, prv1, pub);
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ATF_REQUIRE(pf1 != NULL);
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p = ip_packet(254, 64);
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UNNAT_CHECK(p, ext, pub, prv1);
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UNNAT_CHECK(p, ext, masq, masq);
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pf2 = LibAliasRedirectAddr(la, prv2, pub);
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ATF_REQUIRE(pf2 != NULL);
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UNNAT_CHECK(p, ext, pub, prv1);
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p->ip_p = 253; /* new flows */
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UNNAT_CHECK(p, ext, pub, prv2);
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UNNAT_CHECK(p, ext, masq, masq);
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p->ip_p = 252; /* new flows */
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NAT_CHECK(p, prv1, ext, pub);
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NAT_CHECK(p, prv2, ext, pub);
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NAT_CHECK(p, prv3, ext, masq);
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LibAliasSetMode(la, PKT_ALIAS_DENY_INCOMING, ~0);
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p->ip_p = 251; /* new flows */
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UNNAT_FAIL(p, ext, pub);
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UNNAT_FAIL(p, ext, masq);
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/* unhide older version */
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LibAliasRedirectDelete(la, pf2);
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LibAliasSetMode(la, 0, ~0);
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p->ip_p = 250; /* new flows */
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UNNAT_CHECK(p, ext, pub, prv1);
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p->ip_p = 249; /* new flows */
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NAT_CHECK(p, prv1, ext, pub);
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NAT_CHECK(p, prv2, ext, masq);
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NAT_CHECK(p, prv3, ext, masq);
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free(p);
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LibAliasUninit(la);
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}
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ATF_TC_WITHOUT_HEAD(5_lsnat);
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ATF_TC_BODY(5_lsnat, dummy)
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{
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struct libalias *la = LibAliasInit(NULL);
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struct alias_link *pf;
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struct ip *p;
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struct udphdr *u;
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ATF_REQUIRE(la != NULL);
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LibAliasSetMode(la, 0, ~0);
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p = ip_packet(0, 64);
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pf = LibAliasRedirectPort(la, cgn, ntohs(0xdead), ANY_ADDR, 0, masq, ntohs(0xabcd), IPPROTO_UDP);
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ATF_REQUIRE(pf != NULL);
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ATF_REQUIRE(0 == LibAliasAddServer(la, pf, prv1, ntohs(0x1234)));
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ATF_REQUIRE(0 == LibAliasAddServer(la, pf, prv2, ntohs(0x2345)));
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ATF_REQUIRE(0 == LibAliasAddServer(la, pf, prv3, ntohs(0x3456)));
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UDP_UNNAT_CHECK(p, u, ext, 0x5678, masq, 0xabcd, prv3, 0x3456);
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UDP_UNNAT_CHECK(p, u, ext, 0x5679, masq, 0xabcd, prv2, 0x2345);
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UDP_UNNAT_CHECK(p, u, ext, 0x567a, masq, 0xabcd, prv1, 0x1234);
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UDP_UNNAT_CHECK(p, u, ext, 0x567b, masq, 0xabcd, prv3, 0x3456);
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UDP_UNNAT_CHECK(p, u, ext, 0x567c, masq, 0xabcd, prv2, 0x2345);
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UDP_UNNAT_CHECK(p, u, ext, 0x567d, masq, 0xabcd, prv1, 0x1234);
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free(p);
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LibAliasUninit(la);
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}
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ATF_TC_WITHOUT_HEAD(6_oneshot);
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ATF_TC_BODY(6_oneshot, dummy)
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{
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struct libalias *la = LibAliasInit(NULL);
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struct alias_link *pf;
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struct ip *p;
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struct udphdr *u;
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ATF_REQUIRE(la != NULL);
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LibAliasSetMode(la, 0, ~0);
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LibAliasSetMode(la, PKT_ALIAS_RESET_ON_ADDR_CHANGE, ~0);
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LibAliasSetMode(la, PKT_ALIAS_DENY_INCOMING, PKT_ALIAS_DENY_INCOMING);
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pf = LibAliasRedirectPort(la, prv1, ntohs(0x1234), ANY_ADDR, 0, masq, ntohs(0xabcd), IPPROTO_UDP);
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ATF_REQUIRE(pf != NULL);
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/* only for fully specified links */
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ATF_CHECK(-1 == LibAliasRedirectDynamic(la, pf));
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LibAliasRedirectDelete(la, pf);
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pf = LibAliasRedirectPort(la, prv1, ntohs(0x1234), ext, ntohs(0x5678), masq, ntohs(0xabcd), IPPROTO_UDP);
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ATF_REQUIRE(pf != NULL);
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ATF_CHECK(0 == LibAliasRedirectDynamic(la, pf));
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p = ip_packet(0, 64);
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UDP_UNNAT_CHECK(p, u, ext, 0x5678, masq, 0xabcd, prv1, 0x1234);
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/* clear table by keeping the address */
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LibAliasSetAddress(la, ext);
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LibAliasSetAddress(la, masq);
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/* does not work anymore */
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UDP_UNNAT_FAIL(p, u, ext, 0x5678, masq, 0xabcd);
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free(p);
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LibAliasUninit(la);
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}
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ATF_TP_ADD_TCS(natin)
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{
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/* Use "dd if=/dev/random bs=2 count=1 | od -x" to reproduce */
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srand(0xe859);
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ATF_TP_ADD_TC(natin, 1_portforward);
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ATF_TP_ADD_TC(natin, 2_portoverlap);
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ATF_TP_ADD_TC(natin, 3_redirectany);
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ATF_TP_ADD_TC(natin, 4_redirectaddr);
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ATF_TP_ADD_TC(natin, 5_lsnat);
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ATF_TP_ADD_TC(natin, 6_oneshot);
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return atf_no_error();
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}
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