8d09cb243f
* Fix some typos Corect some words for reading more easily * Update NOERROR response code NOERROR is a response code so I revert the typo checking for it
64 lines
2.4 KiB
Go
64 lines
2.4 KiB
Go
package dnssec
|
|
|
|
import (
|
|
"github.com/coredns/coredns/plugin/pkg/response"
|
|
"github.com/coredns/coredns/request"
|
|
|
|
"github.com/miekg/dns"
|
|
)
|
|
|
|
// nsec returns an NSEC useful for NXDOMAIN responses.
|
|
// See https://tools.ietf.org/html/draft-valsorda-dnsop-black-lies-00
|
|
// For example, a request for the non-existing name a.example.com would
|
|
// cause the following NSEC record to be generated:
|
|
// a.example.com. 3600 IN NSEC \000.a.example.com. ( RRSIG NSEC ... )
|
|
// This inturn makes every NXDOMAIN answer a NODATA one, don't forget to flip
|
|
// the header rcode to NOERROR.
|
|
func (d Dnssec) nsec(state request.Request, mt response.Type, ttl, incep, expir uint32, server string) ([]dns.RR, error) {
|
|
nsec := &dns.NSEC{}
|
|
nsec.Hdr = dns.RR_Header{Name: state.QName(), Ttl: ttl, Class: dns.ClassINET, Rrtype: dns.TypeNSEC}
|
|
nsec.NextDomain = "\\000." + state.QName()
|
|
if state.Name() == state.Zone {
|
|
nsec.TypeBitMap = filter18(state.QType(), apexBitmap, mt)
|
|
} else {
|
|
nsec.TypeBitMap = filter14(state.QType(), zoneBitmap, mt)
|
|
}
|
|
|
|
sigs, err := d.sign([]dns.RR{nsec}, state.Zone, ttl, incep, expir, server)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return append(sigs, nsec), nil
|
|
}
|
|
|
|
// The NSEC bit maps we return.
|
|
var (
|
|
zoneBitmap = [...]uint16{dns.TypeA, dns.TypeHINFO, dns.TypeTXT, dns.TypeAAAA, dns.TypeLOC, dns.TypeSRV, dns.TypeCERT, dns.TypeSSHFP, dns.TypeRRSIG, dns.TypeNSEC, dns.TypeTLSA, dns.TypeHIP, dns.TypeOPENPGPKEY, dns.TypeSPF}
|
|
apexBitmap = [...]uint16{dns.TypeA, dns.TypeNS, dns.TypeSOA, dns.TypeHINFO, dns.TypeMX, dns.TypeTXT, dns.TypeAAAA, dns.TypeLOC, dns.TypeSRV, dns.TypeCERT, dns.TypeSSHFP, dns.TypeRRSIG, dns.TypeNSEC, dns.TypeDNSKEY, dns.TypeTLSA, dns.TypeHIP, dns.TypeOPENPGPKEY, dns.TypeSPF}
|
|
)
|
|
|
|
// filter14 filters out t from bitmap (if it exists). If mt is not an NODATA response, just return the entire bitmap.
|
|
func filter14(t uint16, bitmap [14]uint16, mt response.Type) []uint16 {
|
|
if mt != response.NoData && mt != response.NameError {
|
|
return zoneBitmap[:]
|
|
}
|
|
for i := range bitmap {
|
|
if bitmap[i] == t {
|
|
return append(bitmap[:i], bitmap[i+1:]...)
|
|
}
|
|
}
|
|
return zoneBitmap[:] // make a slice
|
|
}
|
|
|
|
func filter18(t uint16, bitmap [18]uint16, mt response.Type) []uint16 {
|
|
if mt != response.NoData && mt != response.NameError {
|
|
return apexBitmap[:]
|
|
}
|
|
for i := range bitmap {
|
|
if bitmap[i] == t {
|
|
return append(bitmap[:i], bitmap[i+1:]...)
|
|
}
|
|
}
|
|
return apexBitmap[:] // make a slice
|
|
}
|