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Merge branch '2467-add-a-system-test-checking-a-malformed-ixfr' into 'main'

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Add a system test checking a malformed IXFR

Closes #2467

See merge request isc-projects/bind9!5132
This commit is contained in:
Michał Kępień
2021-06-02 11:35:55 +00:00
parent c70d9c4e9a 5547003a3d
commit 715dc196e2
1 changed files with 61 additions and 1 deletions
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62
bin/tests/system/ixfr/tests.sh
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@@ -108,7 +108,7 @@ if [ $ret != 0 ]; then echo_i "failed"; fi
status=$((status+ret))
n=$((n+1))
echo_i "testing AXFR fallback after IXFR failure ($n)"
echo_i "testing AXFR fallback after IXFR failure (not exact error) ($n)"
ret=0
# Provide a broken IXFR response and a working fallback AXFR response
@@ -142,6 +142,66 @@ $DIG $DIGOPTS @10.53.0.1 nil. TXT | grep 'fallback AXFR' >/dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=$((status+ret))
n=$((n+1))
echo_i "testing AXFR fallback after IXFR failure (bad SOA owner) ($n)"
ret=0
# Prepare for checking the logs later on.
nextpart ns1/named.run >/dev/null
# Provide a broken IXFR response and a working fallback AXFR response.
sendcmd <<EOF
/SOA/
nil. 300 SOA ns.nil. root.nil. 4 300 300 604800 300
/IXFR/
nil. 300 SOA ns.nil. root.nil. 4 300 300 604800 300
nil. 300 SOA ns.nil. root.nil. 3 300 300 604800 300
bad-owner. 300 SOA ns.nil. root.nil. 4 300 300 604800 300
test.nil. 300 TXT "serial 4, malformed IXFR"
nil. 300 SOA ns.nil. root.nil. 4 300 300 604800 300
/AXFR/
nil. 300 SOA ns.nil. root.nil. 4 300 300 604800 300
/AXFR/
nil. 300 NS ns.nil.
test.nil. 300 TXT "serial 4, fallback AXFR"
/AXFR/
nil. 300 SOA ns.nil. root.nil. 4 300 300 604800 300
EOF
$RNDCCMD 10.53.0.1 refresh nil | sed 's/^/ns1 /' | cat_i
# A broken server would accept the malformed IXFR and apply its contents to the
# zone. A fixed one would reject the IXFR and fall back to AXFR. Both IXFR and
# AXFR above bring the nil. zone up to serial 4, but we cannot reliably query
# for the SOA record to check whether the transfer was finished because a broken
# server would send back SERVFAIL responses to SOA queries after accepting the
# malformed IXFR. Instead, check transfer progress by querying for a TXT record
# at test.nil. which is present in both IXFR and AXFR (with different contents).
_wait_until_transfer_is_finished() {
$DIG $DIGOPTS +tries=1 +time=1 @10.53.0.1 test.nil. TXT > dig.out.test$n.1 &&
grep -q -F "serial 4" dig.out.test$n.1
}
if ! retry_quiet 10 _wait_until_transfer_is_finished; then
echo_i "timed out waiting for version 4 of zone nil. to be transferred"
ret=1
fi
# At this point a broken server would be serving a zone with no SOA records.
# Try crashing it by triggering a SOA refresh query.
$RNDCCMD 10.53.0.1 refresh nil | sed 's/^/ns1 /' | cat_i
# Do not wait until the zone refresh completes - even if a crash has not
# happened by now, a broken server would never serve the record which is only
# present in the fallback AXFR, so checking for that is enough to verify if a
# server is broken or not; if it is, it is bound to crash shortly anyway.
$DIG $DIGOPTS test.nil. TXT @10.53.0.1 > dig.out.test$n.2 || ret=1
grep -q -F "serial 4, fallback AXFR" dig.out.test$n.2 || ret=1
# Ensure the expected error is logged.
nextpart ns1/named.run | grep -q -F "SOA name mismatch" || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=$((status+ret))
n=$((n+1))
echo_i "testing ixfr-from-differences option ($n)"
# ns3 is primary; ns4 is secondary