What is DNS Rrsig?
An RRSIG-record holds a DNSSEC signature for a record set (one or more DNS records with the same name and type). Resolvers can verify the signature with a public key stored in a DNSKEY-record.
How does nsec work?
NSEC works by returning the “next secure” record. For example, consider a name server that defines AAAA records for api, blog, and www. If you request a record for store, it would return an NSEC record containing www, meaning there’s no AAAA records between store and www when the records are sorted alphabetically.
What comes first in an Rrsig record?
When an authoritative name server uses the private key of the ZSK pair to sign each RRset in a zone, the digital signature on each RRset is stored in an RRSIG record. Therefore, a signed zone contains an RRSIG record for each RRset. The first four fields specify the owner name, TTL, class, and RR type.
How do I secure my DNS?
Here are some of the most effective ways to lock down DNS servers.
- Use DNS forwarders.
- Use caching-only DNS servers.
- Use DNS advertisers.
- Use DNS resolvers.
- Protect DNS from cache pollution.
- Enable DDNS for secure connections only.
- Disable zone transfers.
- Use firewalls to control DNS access.
What does Rrsig stand for?
RRSIG (resource record signature) Contains the DNSSEC signature for a record set. DNS resolvers verify the signature with a public key, stored in a DNSKEY record. DNSKEY. Contains the public key that a DNS resolver uses to verify DNSSEC signatures in RRSIG records.
How is the digest of a DNSKEY RR calculated?
According to RFC4034: The DS record refers to a DNSKEY RR by including a digest of that DNSKEY RR. The digest is calculated by concatenating the canonical form of the fully qualified owner name of the DNSKEY RR with the DNSKEY RDATA, and then applying the digest algorithm.
How does the resolver validate the DNSKEY record?
The resolver can then pull the DNSKEY record containing the public ZSK from the name server. Together, the RRset, RRSIG, and public ZSK can validate the response. If we trust the zone-signing key in the DNSKEY record, we can trust all the records in the zone. But, what if the zone-signing key was compromised?
Where is the DNSKEY record in the parent zone?
References a DNSKEY record in the sub-delegated zone. The DS record is placed in the parent zone along with the delegating NS records. Contains a link to the next record name in the zone and lists the record types that exist for the record’s name.
How is RRSIG used to validate DNS records?
Thanks to the RRSIG and the private key sent along with DNS records, each client is able to validate the authenticity of the DNS records received by comparing the data received with the domain’s public key stored in the DNSKEY DNS record.