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This adds negative trust anchor support and allows reading trust anchor
data from disk, from files
/etc/systemd/dnssec-trust-anchors.d/*.positive and
/etc/systemd/dnssec-trust-anchros.d/*.negative, as well as the matching
counterparts in /usr/lib and /run.
The positive trust anchor files are more or less compatible to normal
DNS zone files containing DNSKEY and DS RRs. The negative trust anchor
files contain only new-line separated hostnames for which to require no
signing.
By default no trust anchor files are installed, in which case the
compiled-in root domain DS RR is used, as before. As soon as at least
one positive root anchor for the root is defined via trust anchor files
this buil-in DS RR is not added though.
For NXDOMAIN, it is not sufficient to prove that the next-closest
enclosure does not exist, we must also prove that there is no
wildcard domain directly below the closest enclosure which would
synthesise the name that has been requested.
For positive responses, in addition to exact matches, we should
accept wildcard ones. In that case we must first prove that
there is no precise match (i.e., that the closest encounter
is not the record itself) and secondly that the source of
synthesis exists.
Previously, we'd use the same set of identifiers for both, but that's
actually incorrect. It didn't matter much since the only NSEC3 hash
algorithm defined (SHA-1) is mapped to code 1 which is also what it is
encoded as in DS digests, but we really should make sure to use two
distinct enumerations.
We don't implement it, and we have no intention to, but at least mention
that it exists.
(This also adds a couple of other algorithms to the algorithm string
list, where these strings were missing previously.)
Fixes:
```
$ ./configure ... --enable-dbus
$ make
$ make valgrind-tests TESTS=test-bus-marshal
...
==25301== 51 bytes in 1 blocks are definitely lost in loss record 7 of 18
==25301== at 0x4C2DD9F: realloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==25301== by 0x5496B8C: ??? (in /lib/x86_64-linux-gnu/libdbus-1.so.3.14.3)
==25301== by 0x54973E3: _dbus_string_append_printf_valist (in /lib/x86_64-linux-gnu/libdbus-1.so.3.14.3)
==25301== by 0x547E5C2: _dbus_set_error_valist (in /lib/x86_64-linux-gnu/libdbus-1.so.3.14.3)
==25301== by 0x547E73E: dbus_set_error (in /lib/x86_64-linux-gnu/libdbus-1.so.3.14.3)
==25301== by 0x548969A: dbus_message_demarshal (in /lib/x86_64-linux-gnu/libdbus-1.so.3.14.3)
==25301== by 0x115C1A: main (test-bus-marshal.c:244)
==25301==
```
When we verified a signature, fix up the RR's TTL to the original TTL
mentioned in the signature, and store the signature expiry information
in the RR, too. Then, use that when adding RRs to the cache.
This renames dns_transaction_stop() to dns_transaction_stop_timeout()
and makes it only about stopping the transaction timeout. This is safe,
as in most occasions we call dns_transaction_stop() at the same time as
dns_transaction_close_connection() anyway, which does the rest of what
dns_transaction_stop() used to do. And in the one where we don't call
it, it's implicitly called by the UDP emission or TCP connection code.
This also closes the connections as we enter the validation phase of a
transaction, so that no further messages may be received then.
This removes dnssec_algorithm_supported() and simply uses the
algorithm_to_gcrypt() result as indication whether a DNSSEC algorithm is
supported.
The patch also renames "algorithm" to "md_algorithm", in a few cases, in
order to avoid confusion between DNSSEC signature algorithms and gcrypt
message digest algorithms.
Previously, we'd not allow control characters to be embedded in domain
names, even when escaped. Since cloudflare uses \000 however to
implement its synthethic minimally covering NSEC RRs, we should allow
them, as long as they are properly escaped.
