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| author | Lennart Poettering <lennart@poettering.net> | 2016-01-14 17:28:58 +0100 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2016-01-17 20:44:25 +0100 |
| commit | 1827a1582cbd9dcd1ce337b2404ec4425cb0dfd0 (patch) | |
| tree | 252219a53e8794c7e51b05efa0f5a122da287104 /src/resolve/resolved-dns-dnssec.c | |
| parent | 54b778e7d63ce0af0d5e9401b563c6dd28eff9d3 (diff) | |
| download | systemd-1827a1582cbd9dcd1ce337b2404ec4425cb0dfd0.tar.gz | |
resolved: do not use NSEC RRs from the wrong zone for proofs
When proving NODATA DS lookups we need to insist on looking at the parent zone's NSEC RR, not the child zone's.
When proving any other NODATA lookups we need to insist on looking at the child zone's NSEC RR, not the parent's.
Diffstat (limited to 'src/resolve/resolved-dns-dnssec.c')
| -rw-r--r-- | src/resolve/resolved-dns-dnssec.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/resolve/resolved-dns-dnssec.c b/src/resolve/resolved-dns-dnssec.c index f39454b9f9..b6fb362daa 100644 --- a/src/resolve/resolved-dns-dnssec.c +++ b/src/resolve/resolved-dns-dnssec.c @@ -1583,6 +1583,19 @@ int dnssec_nsec_test(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *r if (r < 0) return r; if (r > 0) { + if (key->type == DNS_TYPE_DS) { + /* If we look for a DS RR and the server sent us the NSEC RR of the child zone + * we have a problem. For DS RRs we want the NSEC RR from the parent */ + if (bitmap_isset(rr->nsec.types, DNS_TYPE_SOA)) + continue; + } else { + /* For all RR types, ensure that if NS is set SOA is set too, so that we know + * we got the child's NSEC. */ + if (bitmap_isset(rr->nsec.types, DNS_TYPE_NS) && + !bitmap_isset(rr->nsec.types, DNS_TYPE_SOA)) + continue; + } + if (bitmap_isset(rr->nsec.types, key->type)) *result = DNSSEC_NSEC_FOUND; else if (bitmap_isset(rr->nsec.types, DNS_TYPE_CNAME)) |