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resolved: try to authenticate SOA on negative replies

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For caching negative replies we need the SOA TTL information. Hence,
let's authenticate all auxiliary SOA RRs through DS requests on all
negative requests.
This commit is contained in:
Lennart Poettering 2017-02-15 20:05:27 +01:00
parent 74a3ed7408
commit 6993d26469
1 changed files with 12 additions and 2 deletions
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14
src/resolve/resolved-dns-transaction.c
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@ -2009,8 +2009,18 @@ int dns_transaction_request_dnssec_keys(DnsTransaction *t) {
r = dns_resource_key_match_rr(t->key, rr, NULL);
if (r < 0)
return r;
if (r == 0)
continue;
if (r == 0) {
/* Hmm, so this SOA RR doesn't match our original question. In this case, maybe this is
* a negative reply, and we need the a SOA RR's TTL in order to cache a negative entry?
* If so, we need to validate it, too. */
r = dns_answer_match_key(t->answer, t->key, NULL);
if (r < 0)
return r;
if (r > 0) /* positive reply, we won't need the SOA and hence don't need to validate
* it. */
continue;
}
r = dnssec_has_rrsig(t->answer, rr->key);
if (r < 0)