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ede5d4ff5b
Don't drop fragmented packets when reassembly is disabled, they can be matched by rules with "fragment" keyword. Ensure that presence of scrub rules forces old behaviour. Reviewed by: kp Sponsored by: InnoGames GmbH Differential Revision: https://reviews.freebsd.org/D42355
386 lines
9.2 KiB
Bash
386 lines
9.2 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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. $(atf_get_srcdir)/utils.subr
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atf_test_case "too_many_fragments" "cleanup"
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too_many_fragments_head()
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{
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atf_set descr 'IPv4 fragment limitation test'
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atf_set require.user root
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}
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too_many_fragments_body()
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{
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pft_init
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epair=$(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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"scrub all fragment reassemble"
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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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"scrub fragment reassemble" \
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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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"scrub all fragment reassemble"
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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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"scrub all fragment reassemble"
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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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"scrub in" \
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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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pft_set_rules alcatraz \
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"scrub in fragment no reassemble" \
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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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# And the fragmented ping doesn't pass if we do not reassemble
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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:2 -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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"scrub fragment reassemble" \
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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, this will fail.
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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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"scrub any reassemble" \
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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_init_test_cases()
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{
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atf_add_test_case "too_many_fragments"
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atf_add_test_case "v6"
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atf_add_test_case "mtu_diff"
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atf_add_test_case "overreplace"
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atf_add_test_case "overindex"
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atf_add_test_case "overlimit"
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atf_add_test_case "reassemble"
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}
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