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65074f6f31
The function `pf_setup_pdesc()` handles ruleset evaluation for non-reassembled packets. Having it called before `pf_mtag` is checked for flags `PF_MTAG_FLAG_ROUTE_TO` and `PF_MTAG_FLAG_DUMMYNET` will cause loops for fragmented packets if reassembly is disabled. Move `pd` zeroing and `pf_mtag` extraction from `pf_setup_pdesc()` to a separate function `pf_init_pdesc()` and change the order of function calls: first call `pf_init_pdesc()`, then check if the currently processed packet has been reinjected from dummynet, finally call `pf_setup_pdesc()`. Add functionality of sending UDP packets to `pft_ping.py` with fragmentation support and fix broken IPv6 reassembly. Reviewed by: kp Differential Revision: https://reviews.freebsd.org/D46880
613 lines
15 KiB
Bash
613 lines
15 KiB
Bash
#
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# SPDX-License-Identifier: BSD-2-Clause
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#
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# Copyright (c) 2017 Kristof Provost <kp@FreeBSD.org>
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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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# 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 copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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. $(atf_get_srcdir)/utils.subr
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common_dir=$(atf_get_srcdir)/../common
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atf_test_case "too_many_fragments" "cleanup"
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too_many_fragments_head()
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{
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atf_set descr 'IPv4 fragment limitation test'
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atf_set require.user root
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}
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too_many_fragments_body()
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{
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pft_init
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epair=$(vnet_mkepair)
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vnet_mkjail alcatraz ${epair}a
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ifconfig ${epair}b inet 192.0.2.1/24 up
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jexec alcatraz ifconfig ${epair}a 192.0.2.2/24 up
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ifconfig ${epair}b mtu 200
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jexec alcatraz ifconfig ${epair}a mtu 200
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jexec alcatraz pfctl -e
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pft_set_rules alcatraz \
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"set reassemble yes" \
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"pass keep state"
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# So we know pf is limiting things
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jexec alcatraz sysctl net.inet.ip.maxfragsperpacket=1024
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# Sanity check
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atf_check -s exit:0 -o ignore ping -c 1 192.0.2.2
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# We can ping with < 64 fragments
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atf_check -s exit:0 -o ignore ping -c 1 -s 800 192.0.2.2
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# Too many fragments should fail
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atf_check -s exit:2 -o ignore ping -c 1 -s 20000 192.0.2.2
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}
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too_many_fragments_cleanup()
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{
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pft_cleanup
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}
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atf_test_case "v6" "cleanup"
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v6_head()
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{
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atf_set descr 'IPv6 fragmentation test'
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atf_set require.user root
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atf_set require.progs scapy
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}
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v6_body()
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{
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pft_init
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epair_send=$(vnet_mkepair)
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epair_link=$(vnet_mkepair)
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vnet_mkjail alcatraz ${epair_send}b ${epair_link}a
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vnet_mkjail singsing ${epair_link}b
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ifconfig ${epair_send}a inet6 2001:db8:42::1/64 no_dad up
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jexec alcatraz ifconfig ${epair_send}b inet6 2001:db8:42::2/64 no_dad up
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jexec alcatraz ifconfig ${epair_link}a inet6 2001:db8:43::2/64 no_dad up
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jexec alcatraz sysctl net.inet6.ip6.forwarding=1
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jexec singsing ifconfig ${epair_link}b inet6 2001:db8:43::3/64 no_dad up
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jexec singsing route add -6 2001:db8:42::/64 2001:db8:43::2
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route add -6 2001:db8:43::/64 2001:db8:42::2
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jexec alcatraz ifconfig ${epair_send}b inet6 -ifdisabled
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jexec alcatraz ifconfig ${epair_link}a inet6 -ifdisabled
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jexec singsing ifconfig ${epair_link}b inet6 -ifdisabled
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ifconfig ${epair_send}a inet6 -ifdisabled
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ifconfig ${epair_send}a
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jexec alcatraz ifconfig ${epair_send}b
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lladdr=$(jexec alcatraz ifconfig ${epair_send}b | awk '/ scopeid / { print($2); }' | cut -f 1 -d %)
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jexec alcatraz pfctl -e
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pft_set_rules alcatraz \
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"set reassemble yes" \
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"pass keep state" \
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"block in" \
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"pass in inet6 proto icmp6 icmp6-type { neighbrsol, neighbradv }" \
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"pass in inet6 proto icmp6 icmp6-type { echoreq, echorep }" \
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"set skip on lo"
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# Host test
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atf_check -s exit:0 -o ignore \
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ping -6 -c 1 2001:db8:42::2
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atf_check -s exit:0 -o ignore \
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ping -6 -c 1 -s 4500 2001:db8:42::2
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atf_check -s exit:0 -o ignore\
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ping -6 -c 1 -b 70000 -s 65000 2001:db8:42::2
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# Force an NDP lookup
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ping -6 -c 1 ${lladdr}%${epair_send}a
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atf_check -s exit:0 -o ignore\
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ping -6 -c 1 -b 70000 -s 65000 ${lladdr}%${epair_send}a
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# Forwarding test
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atf_check -s exit:0 -o ignore \
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ping -6 -c 1 2001:db8:43::3
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atf_check -s exit:0 -o ignore \
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ping -6 -c 1 -s 4500 2001:db8:43::3
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atf_check -s exit:0 -o ignore\
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ping -6 -c 1 -b 70000 -s 65000 2001:db8:43::3
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$(atf_get_srcdir)/CVE-2019-5597.py \
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${epair_send}a \
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2001:db8:42::1 \
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2001:db8:43::3
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}
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v6_cleanup()
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{
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pft_cleanup
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}
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atf_test_case "mtu_diff" "cleanup"
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mtu_diff_head()
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{
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atf_set descr 'Test reassembly across different MTUs, PR #255432'
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atf_set require.user root
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}
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mtu_diff_body()
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{
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pft_init
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epair_small=$(vnet_mkepair)
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epair_large=$(vnet_mkepair)
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vnet_mkjail first ${epair_small}b ${epair_large}a
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vnet_mkjail second ${epair_large}b
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ifconfig ${epair_small}a 192.0.2.1/25 up
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jexec first ifconfig ${epair_small}b 192.0.2.2/25 up
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jexec first sysctl net.inet.ip.forwarding=1
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jexec first ifconfig ${epair_large}a 192.0.2.130/25 up
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jexec first ifconfig ${epair_large}a mtu 9000
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jexec second ifconfig ${epair_large}b 192.0.2.131/25 up
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jexec second ifconfig ${epair_large}b mtu 9000
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jexec second route add default 192.0.2.130
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route add 192.0.2.128/25 192.0.2.2
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jexec first pfctl -e
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pft_set_rules first \
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"set reassemble yes" \
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"pass keep state"
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# Sanity checks
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atf_check -s exit:0 -o ignore ping -c 1 192.0.2.2
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atf_check -s exit:0 -o ignore ping -c 1 192.0.2.130
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atf_check -s exit:0 -o ignore ping -c 1 192.0.2.131
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# Large packet that'll get reassembled and sent out in one on the large
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# epair
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atf_check -s exit:0 -o ignore ping -c 1 -s 8000 192.0.2.131
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}
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mtu_diff_cleanup()
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{
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pft_cleanup
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}
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frag_common()
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{
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name=$1
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pft_init
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epair=$(vnet_mkepair)
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vnet_mkjail alcatraz ${epair}a
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ifconfig ${epair}b inet 192.0.2.1/24 up
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jexec alcatraz ifconfig ${epair}a 192.0.2.2/24 up
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jexec alcatraz pfctl -e
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pft_set_rules alcatraz \
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"set reassemble yes" \
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"pass keep state"
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# Sanity check
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atf_check -s exit:0 -o ignore ping -c 1 192.0.2.2
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atf_check -s exit:0 -o ignore $(atf_get_srcdir)/frag-${1}.py \
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--to 192.0.2.2 \
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--fromaddr 192.0.2.1 \
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--sendif ${epair}b \
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--recvif ${epair}b
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}
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atf_test_case "overreplace" "cleanup"
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overreplace_head()
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{
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atf_set descr 'ping fragment that overlaps fragment at index boundary and replace it'
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atf_set require.user root
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atf_set require.progs scapy
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}
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overreplace_body()
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{
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frag_common overreplace
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}
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overreplace_cleanup()
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{
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pft_cleanup
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}
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atf_test_case "overindex" "cleanup"
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overindex_head()
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{
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atf_set descr 'ping fragment that overlaps the first fragment at index boundary'
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atf_set require.user root
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atf_set require.progs scapy
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}
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overindex_body()
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{
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frag_common overindex
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}
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overindex_cleanup()
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{
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pft_cleanup
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}
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atf_test_case "overlimit" "cleanup"
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overlimit_head()
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{
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atf_set descr 'ping fragment at index boundary that cannot be requeued'
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atf_set require.user root
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atf_set require.progs scapy
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}
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overlimit_body()
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{
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frag_common overlimit
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}
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overlimit_cleanup()
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{
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pft_cleanup
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}
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atf_test_case "reassemble" "cleanup"
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reassemble_head()
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{
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atf_set descr 'Test reassembly'
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atf_set require.user root
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}
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reassemble_body()
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{
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pft_init
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epair=$(vnet_mkepair)
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vnet_mkjail alcatraz ${epair}a
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ifconfig ${epair}b inet 192.0.2.1/24 up
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jexec alcatraz ifconfig ${epair}a 192.0.2.2/24 up
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# Sanity check
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atf_check -s exit:0 -o ignore ping -c 1 192.0.2.2
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jexec alcatraz pfctl -e
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pft_set_rules alcatraz \
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"pass out" \
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"block in" \
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"pass in inet proto icmp all icmp-type echoreq"
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# Single fragment passes
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atf_check -s exit:0 -o ignore ping -c 1 192.0.2.2
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# But a fragmented ping does not
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atf_check -s exit:2 -o ignore ping -c 1 -s 2000 192.0.2.2
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pft_set_rules alcatraz \
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"set reassemble yes" \
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"pass out" \
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"block in" \
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"pass in inet proto icmp all icmp-type echoreq"
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# Both single packet & fragmented pass when we scrub
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atf_check -s exit:0 -o ignore ping -c 1 192.0.2.2
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atf_check -s exit:0 -o ignore ping -c 1 -s 2000 192.0.2.2
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}
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reassemble_cleanup()
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{
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pft_cleanup
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}
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atf_test_case "no_df" "cleanup"
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no_df_head()
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{
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atf_set descr 'Test removing of DF flag'
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atf_set require.user root
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}
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no_df_body()
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{
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setup_router_server_ipv4
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ifconfig ${epair_tester}a mtu 9000
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jexec router ifconfig ${epair_tester}b mtu 9000
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jexec router ifconfig ${epair_server}a mtu 1500
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jexec server ifconfig ${epair_server}b mtu 1500
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# Sanity check.
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ping_server_check_reply exit:0 --ping-type=icmp
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pft_set_rules router \
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"set reassemble no" \
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"pass out" \
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"block in" \
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"pass in inet proto icmp all icmp-type echoreq"
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# Ping with normal, fragmentable packets.
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ping_server_check_reply exit:1 --ping-type=icmp --send-length=2000
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pft_set_rules router \
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"set reassemble yes" \
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"pass out" \
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"block in" \
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"pass in inet proto icmp all icmp-type echoreq"
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# Ping with normal, fragmentable packets.
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ping_server_check_reply exit:0 --ping-type=icmp --send-length=2000
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# Ping with non-fragmentable packets.
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ping_server_check_reply exit:1 --ping-type=icmp --send-length=2000 --send-flags DF
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pft_set_rules router \
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"set reassemble yes no-df" \
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"pass out" \
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"block in" \
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"pass in inet proto icmp all icmp-type echoreq"
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# Ping with non-fragmentable packets again.
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# This time pf will strip the DF flag.
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ping_server_check_reply exit:0 --ping-type=icmp --send-length=2000 --send-flags DF
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}
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no_df_cleanup()
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{
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pft_cleanup
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}
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atf_test_case "no_df" "cleanup"
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no_df_head()
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{
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atf_set descr 'Test removing of DF flag'
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atf_set require.user root
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}
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no_df_body()
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{
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setup_router_server_ipv4
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# Tester can send long packets which will get fragmented by the router.
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# Replies from server will come in fragments which might get
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# reassembled resulting in a long reply packet sent back to tester.
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ifconfig ${epair_tester}a mtu 9000
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jexec router ifconfig ${epair_tester}b mtu 9000
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jexec router ifconfig ${epair_server}a mtu 1500
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jexec server ifconfig ${epair_server}b mtu 1500
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# Sanity check.
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ping_server_check_reply exit:0 --ping-type=icmp
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# Enable packet reassembly with clearing of the no-df flag.
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pft_set_rules router \
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"scrub all fragment reassemble no-df" \
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"block" \
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"pass inet proto icmp all icmp-type echoreq"
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# Ping with non-fragmentable packets.
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# pf will strip the DF flag resulting in fragmentation and packets
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# getting properly forwarded.
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ping_server_check_reply exit:0 --ping-type=icmp --send-length=2000 --send-flags DF
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}
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no_df_cleanup()
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{
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pft_cleanup
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}
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atf_test_case "reassemble_slowpath" "cleanup"
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reassemble_slowpath_head()
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{
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atf_set descr 'Test reassembly on the slow path'
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atf_set require.user root
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}
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reassemble_slowpath_body()
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{
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if ! sysctl -q kern.features.ipsec >/dev/null ; then
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atf_skip "This test requires ipsec"
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fi
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setup_router_server_ipv4
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# Now define an ipsec policy so we end up taking the slow path.
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# We don't actually need the traffic to go through ipsec, we just don't
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# want to go through ip_tryforward().
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echo "flush;
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spdflush;
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spdadd 203.0.113.1/32 203.0.113.2/32 any -P out ipsec esp/transport//require;
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add 203.0.113.1 203.0.113.2 esp 0x1001 -E aes-gcm-16 \"12345678901234567890\";" \
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| jexec router setkey -c
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# Sanity check.
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ping_server_check_reply exit:0 --ping-type=icmp
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# Enable packet reassembly with clearing of the no-df flag.
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pft_set_rules router \
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"scrub in on ${epair_tester}b fragment no reassemble" \
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"scrub on ${epair_server}a fragment reassemble" \
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"pass"
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# Ensure that the packet makes it through the slow path
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atf_check -s exit:0 -o ignore \
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ping -c 1 -s 2000 198.51.100.2
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}
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reassemble_slowpath_cleanup()
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{
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pft_cleanup
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}
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atf_test_case "dummynet" "cleanup"
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dummynet_head()
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{
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atf_set descr 'dummynet + reassembly test'
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atf_set require.user root
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}
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dummynet_body()
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{
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pft_init
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dummynet_init
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epair=$(vnet_mkepair)
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vnet_mkjail alcatraz ${epair}a
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ifconfig ${epair}b inet 192.0.2.1/24 up
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jexec alcatraz ifconfig ${epair}a 192.0.2.2/24 up
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# Sanity check
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atf_check -s exit:0 -o ignore ping -c 1 192.0.2.2
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jexec alcatraz dnctl pipe 1 config bw 600Byte/s
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jexec alcatraz dnctl pipe 2 config bw 700Byte/s
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jexec alcatraz pfctl -e
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pft_set_rules alcatraz \
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"set reassemble yes" \
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"block" \
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"pass inet proto icmp all icmp-type echoreq dnpipe (1, 2)"
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|
|
|
atf_check -s exit:0 -o ignore ping -s 2000 -c 1 192.0.2.2
|
|
}
|
|
|
|
dummynet_cleanup()
|
|
{
|
|
pft_cleanup
|
|
}
|
|
|
|
atf_test_case "dummynet_nat" "cleanup"
|
|
dummynet_nat_head()
|
|
{
|
|
atf_set descr 'Test dummynet on NATed fragmented traffic'
|
|
atf_set require.user root
|
|
}
|
|
|
|
dummynet_nat_body()
|
|
{
|
|
pft_init
|
|
dummynet_init
|
|
|
|
epair_one=$(vnet_mkepair)
|
|
ifconfig ${epair_one}a 192.0.2.1/24 up
|
|
|
|
epair_two=$(vnet_mkepair)
|
|
|
|
vnet_mkjail alcatraz ${epair_one}b ${epair_two}a
|
|
jexec alcatraz ifconfig ${epair_one}b 192.0.2.2/24 up
|
|
jexec alcatraz ifconfig ${epair_two}a 198.51.100.1/24 up
|
|
jexec alcatraz sysctl net.inet.ip.forwarding=1
|
|
|
|
vnet_mkjail singsing ${epair_two}b
|
|
jexec singsing ifconfig ${epair_two}b 198.51.100.2/24 up
|
|
jexec singsing route add default 198.51.100.1
|
|
|
|
route add 198.51.100.0/24 192.0.2.2
|
|
|
|
jexec alcatraz dnctl pipe 1 config bw 1600Byte/s
|
|
jexec alcatraz dnctl pipe 2 config bw 1700Byte/s
|
|
|
|
jexec alcatraz pfctl -e
|
|
pft_set_rules alcatraz \
|
|
"set reassemble yes" \
|
|
"nat on ${epair_two}a from 192.0.2.0/24 -> (${epair_two}a)" \
|
|
"block in" \
|
|
"pass in inet proto icmp all icmp-type echoreq dnpipe (1, 2)"
|
|
|
|
atf_check -s exit:0 -o ignore ping -c 1 198.51.100.2
|
|
atf_check -s exit:0 -o ignore ping -c 1 -s 2000 198.51.100.2
|
|
}
|
|
|
|
dummynet_nat_cleanup()
|
|
{
|
|
pft_cleanup
|
|
}
|
|
|
|
atf_test_case "dummynet_fragmented" "cleanup"
|
|
dummynet_fragmented_head()
|
|
{
|
|
atf_set descr 'Test dummynet on NATed fragmented traffic'
|
|
atf_set require.user root
|
|
}
|
|
|
|
dummynet_fragmented_body()
|
|
{
|
|
pft_init
|
|
dummynet_init
|
|
|
|
# No test for IPv6. IPv6 fragment reassembly can't be disabled.
|
|
setup_router_dummy_ipv4
|
|
|
|
jexec router dnctl pipe 1 config delay 1
|
|
|
|
pft_set_rules router \
|
|
"set reassemble no" \
|
|
"block" \
|
|
"pass inet6 proto icmp6 icmp6-type { neighbrsol, neighbradv }" \
|
|
"pass in on ${epair_tester}b inet proto udp dnpipe (1, 1)" \
|
|
"pass out on ${epair_server}a inet proto udp" \
|
|
|
|
ping_dummy_check_request exit:0 --ping-type=udp --send-length=10000 --send-frag-length=1280
|
|
|
|
rules=$(mktemp) || exit 1
|
|
jexec router pfctl -qvsr > $rules
|
|
|
|
# Count that fragmented packets have hit the rule only once and that
|
|
# they have not created states. There is no stateful firewall support
|
|
# for fragmented packets.
|
|
grep -A2 'pass in on epair0b inet proto udp all keep state dnpipe(1, 1)' $rules |
|
|
grep -qE 'Packets: 8\s+Bytes: 10168\s+States: 0\s+' ||
|
|
atf_fail "Fragmented packets not counted correctly"
|
|
}
|
|
|
|
dummynet_fragmented_cleanup()
|
|
{
|
|
pft_cleanup
|
|
}
|
|
|
|
atf_init_test_cases()
|
|
{
|
|
atf_add_test_case "too_many_fragments"
|
|
atf_add_test_case "v6"
|
|
atf_add_test_case "mtu_diff"
|
|
atf_add_test_case "overreplace"
|
|
atf_add_test_case "overindex"
|
|
atf_add_test_case "overlimit"
|
|
atf_add_test_case "reassemble"
|
|
atf_add_test_case "no_df"
|
|
atf_add_test_case "reassemble_slowpath"
|
|
atf_add_test_case "dummynet"
|
|
atf_add_test_case "dummynet_nat"
|
|
atf_add_test_case "dummynet_fragmented"
|
|
}
|