Added DNS zones, DNSSEC signing

dns.go

@@ -0,0 +1,435 @@
+package dns_api
+
+import (
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"git.gammaspectra.live/givna.me/dns-api/ed25519"
+	"github.com/miekg/dns"
+	"math"
+	"net"
+	"strings"
+	"time"
+)
+
+type RRSet []dns.RR
+
+func (l RRSet) Get(rrt uint16, name string) (rrset RRSet) {
+	for _, rr := range l {
+		if rr != nil && rr.Header().Rrtype == rrt && rr.Header().Name == name {
+			rrset = append(rrset, rr)
+		}
+	}
+
+	return
+}
+
+func (l RRSet) Delete(rrt uint16, name string) {
+	for i, rr := range l {
+		if rr != nil && rr.Header().Rrtype == rrt && rr.Header().Name == name {
+			l[i] = nil
+		}
+	}
+}
+
+type Zone struct {
+	publicKey  ed25519.PublicKey
+	privateKey ed25519.PrivateKey
+
+	dnsKey *dns.DNSKEY
+
+	rrset RRSet
+
+	enforcedEntries RRSet
+}
+
+func NewZoneFromPrivateKey(baseZone string, privateKey ed25519.PrivateKey) *Zone {
+	zone := NewZoneFromPublicKey(baseZone, privateKey.Public().(ed25519.PublicKey))
+	if zone == nil {
+		return nil
+	}
+
+	zone.privateKey = privateKey
+
+	return zone
+}
+
+func NewZoneFromPublicKey(baseZone string, publicKey ed25519.PublicKey) *Zone {
+	if len(baseZone) == 0 || baseZone[len(baseZone)-1] != '.' {
+		return nil
+	}
+
+	zone := &Zone{
+		publicKey: publicKey,
+	}
+
+	zone.dnsKey = new(dns.DNSKEY)
+	zone.dnsKey.Hdr.Rrtype = dns.TypeDNSKEY
+	zone.dnsKey.Hdr.Name = PublicKeyToOnionV3(publicKey) + "." + baseZone
+	zone.dnsKey.Hdr.Class = dns.ClassINET
+	//public key cannot expire
+	zone.dnsKey.Hdr.Ttl = 2147483647
+	zone.dnsKey.Flags = 257 //KSK
+	zone.dnsKey.Protocol = 3
+	zone.dnsKey.Algorithm = dns.ED25519
+	zone.dnsKey.PublicKey = base64.StdEncoding.EncodeToString(publicKey)
+
+	return zone
+}
+
+func (z *Zone) DeleteRR(rrtype string, name string) error {
+	rrt, ok := dns.StringToType[rrtype]
+	if !ok {
+		return fmt.Errorf("could not find record type for %s", rrtype)
+	}
+
+	z.rrset.Delete(rrt, name)
+	return nil
+}
+
+func (z *Zone) GetRR(rrtype string, name string) (rrset RRSet) {
+	rrt, ok := dns.StringToType[rrtype]
+	if !ok {
+		return nil
+	}
+
+	return z.rrset.Get(rrt, name)
+}
+
+func (z *Zone) AddRR(rr dns.RR) error {
+	if rr == nil {
+		return errors.New("no valid record found")
+	}
+
+	if !strings.HasSuffix(rr.Header().Name, z.Name()) {
+		return fmt.Errorf("%s is not part of %s", rr.Header().Name, z.Name())
+	}
+
+	z.rrset = append(z.rrset, rr)
+
+	return nil
+}
+
+func (z *Zone) AddRecord(name string, ttl uint32, rr dns.RR) error {
+	if rr == nil {
+		return errors.New("no valid record found")
+	}
+	hdr := rr.Header()
+	hdr.Name = name
+	hdr.Class = dns.ClassINET
+	hdr.Ttl = ttl
+
+	return z.AddRR(rr)
+}
+
+func (z *Zone) AddRecordA(name string, ip net.IP, ttl uint32) error {
+	ip = ip.To4()
+	if ip == nil {
+		return errors.New("invalid ipv4")
+	}
+
+	record := new(dns.A)
+	record.Hdr.Rrtype = dns.TypeA
+	record.A = ip
+	return z.AddRecord(name, ttl, record)
+}
+
+func (z *Zone) AddRecordAAAA(name string, ip net.IP, ttl uint32) error {
+	ip = ip.To16()
+	if ip == nil {
+		return errors.New("invalid ipv6")
+	}
+
+	record := new(dns.AAAA)
+	record.Hdr.Rrtype = dns.TypeAAAA
+	record.AAAA = ip
+	return z.AddRecord(name, ttl, record)
+}
+
+func (z *Zone) AddRecordCNAME(name string, target string, ttl uint32) error {
+	record := new(dns.CNAME)
+	record.Hdr.Rrtype = dns.TypeCNAME
+	record.Target = target
+	return z.AddRecord(name, ttl, record)
+}
+
+func (z *Zone) AddRecordTXT(name string, txt []string, ttl uint32) error {
+	record := new(dns.TXT)
+	record.Hdr.Rrtype = dns.TypeTXT
+	record.Txt = txt
+	return z.AddRecord(name, ttl, record)
+}
+
+func (z *Zone) AddRecordCAA(name string, flag uint8, tag, value string, ttl uint32) error {
+	record := new(dns.CAA)
+	record.Hdr.Rrtype = dns.TypeCAA
+	record.Flag = flag
+	record.Tag = tag
+	record.Value = value
+	return z.AddRecord(name, ttl, record)
+}
+
+func (z *Zone) AddRecordTLSA(name string, usage, selector, matchingType uint8, certificate string, ttl uint32) error {
+	record := new(dns.TLSA)
+	record.Hdr.Rrtype = dns.TypeTLSA
+	record.Usage = usage
+	record.Selector = selector
+	record.MatchingType = matchingType
+	record.Certificate = certificate
+	return z.AddRecord(name, ttl, record)
+}
+
+func (z *Zone) AddRecordSVCB(name string, priority uint16, target string, value []dns.SVCBKeyValue, ttl uint32) error {
+	record := new(dns.SVCB)
+	record.Hdr.Rrtype = dns.TypeSVCB
+	record.Priority = priority
+	record.Target = target
+	record.Value = value
+	return z.AddRecord(name, ttl, record)
+}
+
+func (z *Zone) AddRecordHTTPS(name string, priority uint16, target string, value []dns.SVCBKeyValue, ttl uint32) error {
+	record := new(dns.HTTPS)
+	record.Hdr.Rrtype = dns.TypeHTTPS
+	record.Priority = priority
+	record.Target = target
+	record.Value = value
+	return z.AddRecord(name, ttl, record)
+}
+
+func (z *Zone) AddRecordSSHFP(name string, algorithm, ktype uint8, fingerprint string, ttl uint32) error {
+	record := new(dns.SSHFP)
+	record.Hdr.Rrtype = dns.TypeSSHFP
+	record.Algorithm = algorithm
+	record.Type = ktype
+	record.FingerPrint = fingerprint
+	return z.AddRecord(name, ttl, record)
+}
+
+func (z *Zone) AddRecordMX(name string, preference uint16, mx string, ttl uint32) error {
+	record := new(dns.MX)
+	record.Hdr.Rrtype = dns.TypeMX
+	record.Preference = preference
+	record.Mx = mx
+	return z.AddRecord(name, ttl, record)
+}
+
+func (z *Zone) SetRR(rrtype string, name string, rrset RRSet) error {
+
+	rrt, ok := dns.StringToType[rrtype]
+	if !ok {
+		return fmt.Errorf("could not find record type for %s", rrtype)
+	}
+
+	z.rrset.Delete(rrt, name)
+
+	for i, rr := range rrset {
+		if rr != nil && rr.Header().Rrtype != rrt {
+			return fmt.Errorf("expected %s, got record type %s at index %d", rrtype, dns.TypeToString[rr.Header().Rrtype], i)
+		}
+	}
+
+	for _, rr := range rrset {
+		if rr != nil {
+			if err := z.AddRR(rr); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+func (z *Zone) GetRRSet() RRSet {
+
+	set := make(RRSet, 0, len(z.rrset))
+	for _, rr := range z.rrset {
+		if rr != nil {
+			set = append(set, rr)
+		}
+	}
+	return set
+}
+
+func (z *Zone) AddMissingRecords() {
+	func() {
+		for _, rr := range z.rrset.Get(dns.TypeDNSKEY, z.Name()) {
+			if k, ok := rr.(*dns.DNSKEY); ok {
+				if k.Flags == z.dnsKey.Flags && k.PublicKey == z.dnsKey.PublicKey && k.Algorithm == z.dnsKey.Algorithm {
+					return
+				}
+			}
+		}
+		z.AddRR(z.dnsKey)
+	}()
+
+	func() {
+		for _, rr := range z.rrset.Get(dns.TypeCDNSKEY, z.Name()) {
+			if k, ok := rr.(*dns.CDNSKEY); ok {
+				if k.Flags == z.dnsKey.Flags && k.PublicKey == z.dnsKey.PublicKey && k.Algorithm == z.dnsKey.Algorithm {
+					return
+				}
+			}
+		}
+		cdnskey := dns.CDNSKEY{DNSKEY: *z.dnsKey}
+		cdnskey.Hdr.Rrtype = dns.TypeCDNSKEY
+		z.AddRR(&cdnskey)
+	}()
+
+	func() {
+		ds := z.dnsKey.ToDS(dns.SHA256)
+		if ds == nil {
+			return
+		}
+		for _, rr := range z.rrset.Get(dns.TypeCDS, z.Name()) {
+			if k, ok := rr.(*dns.CDS); ok {
+				if k.KeyTag == ds.KeyTag && k.Digest == ds.Digest {
+					return
+				}
+			}
+		}
+
+		cds := dns.CDS{DS: *ds}
+		cds.Hdr.Rrtype = dns.TypeCDS
+		z.AddRR(&cds)
+	}()
+}
+
+func (z *Zone) Sign() (rrsigs []*dns.RRSIG, err error) {
+
+	var types []uint16
+	var names []string
+
+	inTypes := func(i uint16) bool {
+		if i == dns.TypeRRSIG ||
+			i == dns.TypeDS ||
+			i == dns.TypeTA ||
+			i == dns.TypeSOA ||
+			i == dns.TypeRP {
+			return true
+		}
+		for _, j := range types {
+			if i == j {
+				return true
+			}
+		}
+		return false
+	}
+
+	inNames := func(i string) bool {
+		for _, j := range names {
+			if i == j {
+				return true
+			}
+		}
+		return false
+	}
+
+	z.AddMissingRecords()
+
+	for _, rr := range z.rrset {
+		if rr == nil {
+			continue
+		}
+		h := rr.Header()
+		if !inTypes(h.Rrtype) {
+			types = append(types, h.Rrtype)
+		}
+		if !inNames(h.Name) {
+			names = append(names, h.Name)
+		}
+	}
+
+	//TODO: do check, remove entries
+	/*
+		//TODO: make this an allowlist
+		if rrt == dns.TypeRRSIG ||
+			rrt == dns.TypeDNSKEY ||
+			rrt == dns.TypeCDNSKEY ||
+			rrt == dns.TypeDS ||
+			rrt == dns.TypeCDS ||
+			rrt == dns.TypeNS ||
+			rrt == dns.TypeTA ||
+			rrt == dns.TypeRP ||
+			rrt == dns.TypeSOA { //TODO: allow changing some but with verification of values
+			return fmt.Errorf("type %s not allowed", rrtype)
+		}
+	*/
+
+	//Check if another ZSK key exists for zones, otherwise behave as CSK
+
+	var isKSKOnly bool
+	for _, rr := range z.rrset.Get(dns.TypeDNSKEY, z.Name()) {
+		if k, ok := rr.(*dns.DNSKEY); ok {
+			//found ZSK key that is not ours
+			if k.Flags == 256 && k.PublicKey != z.dnsKey.PublicKey && k.Algorithm == z.dnsKey.Algorithm {
+				isKSKOnly = true
+				break
+			}
+		}
+	}
+
+	//only sign DNSKEY, CDNSKEY, DS, CDS as KSK
+	if isKSKOnly {
+		types = []uint16{dns.TypeDS, dns.TypeCDS, dns.TypeDNSKEY, dns.TypeCDNSKEY}
+	}
+
+	for _, rname := range names {
+		for _, rtype := range types {
+			rrset := z.rrset.Get(rtype, rname)
+			if len(rrset) > 0 {
+				rrsig, err := z.SignRRSet(rrset)
+				if err != nil {
+					return nil, err
+				} else {
+					rrsigs = append(rrsigs, rrsig)
+				}
+			}
+		}
+	}
+
+	return rrsigs, nil
+}
+
+//TODO: implement NSEC or similar
+
+func (z *Zone) SignRRSet(rrset RRSet) (*dns.RRSIG, error) {
+	if rrset == nil || len(rrset) == 0 {
+		return nil, errors.New("no records to sign")
+	}
+
+	if z.privateKey == nil {
+		return nil, errors.New("nil private key")
+	}
+
+	sig := new(dns.RRSIG)
+	//67 years or max uint32, RFC 4034 points to RFC1982 for max of 68y period
+	expirationTime := time.Now().UTC().AddDate(67, 0, 0).Unix()
+	if expirationTime > math.MaxUint32 {
+		expirationTime = math.MaxUint32
+	}
+
+	sig.Expiration = uint32(expirationTime)
+	sig.Inception = uint32(time.Now().UTC().Add(-time.Hour).Unix()) //add one hour in the past
+	sig.KeyTag = z.dnsKey.KeyTag()
+	sig.SignerName = z.dnsKey.Hdr.Name
+	sig.Algorithm = z.dnsKey.Algorithm
+
+	if err := sig.Sign(z.privateKey, rrset); err != nil {
+		return nil, err
+	}
+
+	return sig, nil
+}
+
+func (z *Zone) Name() string {
+	return z.dnsKey.Hdr.Name
+}
+
+func (z *Zone) DNSKEY() *dns.DNSKEY {
+	return z.dnsKey
+}
+
+func (z *Zone) PubKey() ed25519.PublicKey {
+	return z.publicKey
+}

dns_test.go

@@ -0,0 +1,32 @@
+package dns_api
+
+import (
+	"net"
+	"testing"
+)
+
+const testZone = "example.com."
+
+func TestRecordSign(t *testing.T) {
+
+	zone := NewZoneFromPrivateKey(testZone, DecodeTorPrivateKey(testPrivateKey))
+	t.Logf("zone name %s", zone.Name())
+
+	if err := zone.AddRecordA("test."+zone.Name(), net.IPv4(1, 2, 3, 4), 3600); err != nil {
+		t.Error(err)
+	}
+
+	rrsigs, err := zone.Sign()
+
+	if err != nil {
+		t.Error(err)
+	}
+
+	for _, rr := range zone.GetRRSet() {
+		t.Logf("    %s\n", rr.String())
+	}
+
+	for _, rr := range rrsigs {
+		t.Logf("    %s\n", rr.String())
+	}
+}

ed25519/key.go

@@ -5,6 +5,7 @@ import (
 	"crypto"
 	goEd25519 "crypto/ed25519"
 	"crypto/sha512"
+	"errors"
 	"filippo.io/edwards25519"
 	"io"
 	"strconv"
@@ -33,6 +34,19 @@ func Sign(privateKey PrivateKey, message []byte) []byte {
 	return signature
 }
 
+// Sign signs the given message with priv.
+// Ed25519 performs two passes over messages to be signed and therefore cannot
+// handle pre-hashed messages. Thus opts.HashFunc() must return zero to
+// indicate the message hasn't been hashed. This can be achieved by passing
+// crypto.Hash(0) as the value for opts.
+func (priv PrivateKey) Sign(rand io.Reader, message []byte, opts crypto.SignerOpts) (signature []byte, err error) {
+	if opts.HashFunc() != crypto.Hash(0) {
+		return nil, errors.New("ed25519: cannot sign hashed message")
+	}
+
+	return Sign(priv, message), nil
+}
+
 func sign(signature, privateKey, message []byte) {
 	if l := len(privateKey); l != PrivateKeySize {
 		panic("ed25519: bad private key length: " + strconv.Itoa(l))

go.mod

@@ -4,7 +4,13 @@ go 1.18
 
 require (
 	filippo.io/edwards25519 v1.0.0
+	github.com/miekg/dns v1.1.49
 	golang.org/x/crypto v0.0.0-20220525230936-793ad666bf5e
 )
 
-require golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 // indirect
+require (
+	golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 // indirect
+	golang.org/x/net v0.0.0-20220607020251-c690dde0001d // indirect
+	golang.org/x/sys v0.0.0-20220614162138-6c1b26c55098 // indirect
+	golang.org/x/tools v0.1.11 // indirect
+)

go.sum

@@ -1,6 +1,42 @@
 filippo.io/edwards25519 v1.0.0 h1:0wAIcmJUqRdI8IJ/3eGi5/HwXZWPujYXXlkrQogz0Ek=
 filippo.io/edwards25519 v1.0.0/go.mod h1:N1IkdkCkiLB6tki+MYJoSx2JTY9NUlxZE7eHn5EwJns=
+github.com/miekg/dns v1.1.49 h1:qe0mQU3Z/XpFeE+AEBo2rqaS1IPBJ3anmqZ4XiZJVG8=
+github.com/miekg/dns v1.1.49/go.mod h1:e3IlAVfNqAllflbibAZEWOXOQ+Ynzk/dDozDxY7XnME=
+github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20220525230936-793ad666bf5e h1:T8NU3HyQ8ClP4SEE+KbFlg6n0NhuTsN4MyznaarGsZM=
 golang.org/x/crypto v0.0.0-20220525230936-793ad666bf5e/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
-golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 h1:SrN+KX8Art/Sf4HNj6Zcz06G7VEz+7w9tdXTPOZ7+l4=
-golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 h1:6zppjxzCulZykYSLyVDYbneBfbaBIQPYMevg0bEwv2s=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
+golang.org/x/net v0.0.0-20210726213435-c6fcb2dbf985/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/net v0.0.0-20220607020251-c690dde0001d h1:4SFsTMi4UahlKoloni7L4eYzhFRifURQLw+yv0QDCx8=
+golang.org/x/net v0.0.0-20220607020251-c690dde0001d/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=
+golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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