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resolved: don't conclude NODATA if CNAME exists

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Instead introduce the new return-code DNSSEC_NSEC_CNAME to indicate
this condition. See RFC 6840, Section 4.3.
This commit is contained in:
Tom Gundersen 2016-01-01 23:07:34 +01:00
parent 964067666f
commit 146035b3bb
3 changed files with 16 additions and 2 deletions
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16
src/resolve/resolved-dns-dnssec.c
View File

@ -1314,8 +1314,15 @@ found_closest_encloser:
if (!pp) {
/* No next closer NSEC3 RR. That means there's a direct NSEC3 RR for our key. */
*result = bitmap_isset(enclosure_rr->nsec3.types, key->type) ? DNSSEC_NSEC_FOUND : DNSSEC_NSEC_NODATA;
if (bitmap_isset(enclosure_rr->nsec3.types, key->type))
*result = DNSSEC_NSEC_FOUND;
else if (bitmap_isset(enclosure_rr->nsec3.types, DNS_TYPE_CNAME))
*result = DNSSEC_NSEC_CNAME;
else
*result = DNSSEC_NSEC_NODATA;
*authenticated = a;
return 0;
}
@ -1393,7 +1400,12 @@ int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *r
if (r < 0)
return r;
if (r > 0) {
*result = bitmap_isset(rr->nsec.types, key->type) ? DNSSEC_NSEC_FOUND : DNSSEC_NSEC_NODATA;
if (bitmap_isset(rr->nsec.types, key->type))
*result = DNSSEC_NSEC_FOUND;
else if (bitmap_isset(rr->nsec.types, DNS_TYPE_CNAME))
*result = DNSSEC_NSEC_CNAME;
else
*result = DNSSEC_NSEC_NODATA;
*authenticated = flags & DNS_ANSWER_AUTHENTICATED;
return 0;
}

1
src/resolve/resolved-dns-dnssec.h
View File

@ -91,6 +91,7 @@ int dnssec_nsec3_hash(DnsResourceRecord *nsec3, const char *name, void *ret);
typedef enum DnssecNsecResult {
DNSSEC_NSEC_NO_RR, /* No suitable NSEC/NSEC3 RR found */
DNSSEC_NSEC_CNAME, /* Would be NODATA, but for the existence of a CNAME RR */
DNSSEC_NSEC_UNSUPPORTED_ALGORITHM,
DNSSEC_NSEC_NXDOMAIN,
DNSSEC_NSEC_NODATA,

1
src/resolve/resolved-dns-transaction.c
View File

@ -2300,6 +2300,7 @@ int dns_transaction_validate_dnssec(DnsTransaction *t) {
break;
case DNSSEC_NSEC_FOUND:
case DNSSEC_NSEC_CNAME:
/* NSEC says it needs to be there, but we couldn't find it? Bummer! */
t->answer_dnssec_result = DNSSEC_NSEC_MISMATCH;
break;