forked from loweel/zabov
795 lines
19 KiB
Go
795 lines
19 KiB
Go
package dns
|
|
|
|
import (
|
|
"bytes"
|
|
"crypto"
|
|
"crypto/dsa"
|
|
"crypto/ecdsa"
|
|
"crypto/elliptic"
|
|
_ "crypto/md5"
|
|
"crypto/rand"
|
|
"crypto/rsa"
|
|
_ "crypto/sha1"
|
|
_ "crypto/sha256"
|
|
_ "crypto/sha512"
|
|
"encoding/asn1"
|
|
"encoding/binary"
|
|
"encoding/hex"
|
|
"math/big"
|
|
"sort"
|
|
"strings"
|
|
"time"
|
|
|
|
"golang.org/x/crypto/ed25519"
|
|
)
|
|
|
|
// DNSSEC encryption algorithm codes.
|
|
const (
|
|
_ uint8 = iota
|
|
RSAMD5
|
|
DH
|
|
DSA
|
|
_ // Skip 4, RFC 6725, section 2.1
|
|
RSASHA1
|
|
DSANSEC3SHA1
|
|
RSASHA1NSEC3SHA1
|
|
RSASHA256
|
|
_ // Skip 9, RFC 6725, section 2.1
|
|
RSASHA512
|
|
_ // Skip 11, RFC 6725, section 2.1
|
|
ECCGOST
|
|
ECDSAP256SHA256
|
|
ECDSAP384SHA384
|
|
ED25519
|
|
ED448
|
|
INDIRECT uint8 = 252
|
|
PRIVATEDNS uint8 = 253 // Private (experimental keys)
|
|
PRIVATEOID uint8 = 254
|
|
)
|
|
|
|
// AlgorithmToString is a map of algorithm IDs to algorithm names.
|
|
var AlgorithmToString = map[uint8]string{
|
|
RSAMD5: "RSAMD5",
|
|
DH: "DH",
|
|
DSA: "DSA",
|
|
RSASHA1: "RSASHA1",
|
|
DSANSEC3SHA1: "DSA-NSEC3-SHA1",
|
|
RSASHA1NSEC3SHA1: "RSASHA1-NSEC3-SHA1",
|
|
RSASHA256: "RSASHA256",
|
|
RSASHA512: "RSASHA512",
|
|
ECCGOST: "ECC-GOST",
|
|
ECDSAP256SHA256: "ECDSAP256SHA256",
|
|
ECDSAP384SHA384: "ECDSAP384SHA384",
|
|
ED25519: "ED25519",
|
|
ED448: "ED448",
|
|
INDIRECT: "INDIRECT",
|
|
PRIVATEDNS: "PRIVATEDNS",
|
|
PRIVATEOID: "PRIVATEOID",
|
|
}
|
|
|
|
// AlgorithmToHash is a map of algorithm crypto hash IDs to crypto.Hash's.
|
|
var AlgorithmToHash = map[uint8]crypto.Hash{
|
|
RSAMD5: crypto.MD5, // Deprecated in RFC 6725
|
|
DSA: crypto.SHA1,
|
|
RSASHA1: crypto.SHA1,
|
|
RSASHA1NSEC3SHA1: crypto.SHA1,
|
|
RSASHA256: crypto.SHA256,
|
|
ECDSAP256SHA256: crypto.SHA256,
|
|
ECDSAP384SHA384: crypto.SHA384,
|
|
RSASHA512: crypto.SHA512,
|
|
ED25519: crypto.Hash(0),
|
|
}
|
|
|
|
// DNSSEC hashing algorithm codes.
|
|
const (
|
|
_ uint8 = iota
|
|
SHA1 // RFC 4034
|
|
SHA256 // RFC 4509
|
|
GOST94 // RFC 5933
|
|
SHA384 // Experimental
|
|
SHA512 // Experimental
|
|
)
|
|
|
|
// HashToString is a map of hash IDs to names.
|
|
var HashToString = map[uint8]string{
|
|
SHA1: "SHA1",
|
|
SHA256: "SHA256",
|
|
GOST94: "GOST94",
|
|
SHA384: "SHA384",
|
|
SHA512: "SHA512",
|
|
}
|
|
|
|
// DNSKEY flag values.
|
|
const (
|
|
SEP = 1
|
|
REVOKE = 1 << 7
|
|
ZONE = 1 << 8
|
|
)
|
|
|
|
// The RRSIG needs to be converted to wireformat with some of the rdata (the signature) missing.
|
|
type rrsigWireFmt struct {
|
|
TypeCovered uint16
|
|
Algorithm uint8
|
|
Labels uint8
|
|
OrigTtl uint32
|
|
Expiration uint32
|
|
Inception uint32
|
|
KeyTag uint16
|
|
SignerName string `dns:"domain-name"`
|
|
/* No Signature */
|
|
}
|
|
|
|
// Used for converting DNSKEY's rdata to wirefmt.
|
|
type dnskeyWireFmt struct {
|
|
Flags uint16
|
|
Protocol uint8
|
|
Algorithm uint8
|
|
PublicKey string `dns:"base64"`
|
|
/* Nothing is left out */
|
|
}
|
|
|
|
func divRoundUp(a, b int) int {
|
|
return (a + b - 1) / b
|
|
}
|
|
|
|
// KeyTag calculates the keytag (or key-id) of the DNSKEY.
|
|
func (k *DNSKEY) KeyTag() uint16 {
|
|
if k == nil {
|
|
return 0
|
|
}
|
|
var keytag int
|
|
switch k.Algorithm {
|
|
case RSAMD5:
|
|
// Look at the bottom two bytes of the modules, which the last
|
|
// item in the pubkey.
|
|
// This algorithm has been deprecated, but keep this key-tag calculation.
|
|
modulus, _ := fromBase64([]byte(k.PublicKey))
|
|
if len(modulus) > 1 {
|
|
x := binary.BigEndian.Uint16(modulus[len(modulus)-2:])
|
|
keytag = int(x)
|
|
}
|
|
default:
|
|
keywire := new(dnskeyWireFmt)
|
|
keywire.Flags = k.Flags
|
|
keywire.Protocol = k.Protocol
|
|
keywire.Algorithm = k.Algorithm
|
|
keywire.PublicKey = k.PublicKey
|
|
wire := make([]byte, DefaultMsgSize)
|
|
n, err := packKeyWire(keywire, wire)
|
|
if err != nil {
|
|
return 0
|
|
}
|
|
wire = wire[:n]
|
|
for i, v := range wire {
|
|
if i&1 != 0 {
|
|
keytag += int(v) // must be larger than uint32
|
|
} else {
|
|
keytag += int(v) << 8
|
|
}
|
|
}
|
|
keytag += keytag >> 16 & 0xFFFF
|
|
keytag &= 0xFFFF
|
|
}
|
|
return uint16(keytag)
|
|
}
|
|
|
|
// ToDS converts a DNSKEY record to a DS record.
|
|
func (k *DNSKEY) ToDS(h uint8) *DS {
|
|
if k == nil {
|
|
return nil
|
|
}
|
|
ds := new(DS)
|
|
ds.Hdr.Name = k.Hdr.Name
|
|
ds.Hdr.Class = k.Hdr.Class
|
|
ds.Hdr.Rrtype = TypeDS
|
|
ds.Hdr.Ttl = k.Hdr.Ttl
|
|
ds.Algorithm = k.Algorithm
|
|
ds.DigestType = h
|
|
ds.KeyTag = k.KeyTag()
|
|
|
|
keywire := new(dnskeyWireFmt)
|
|
keywire.Flags = k.Flags
|
|
keywire.Protocol = k.Protocol
|
|
keywire.Algorithm = k.Algorithm
|
|
keywire.PublicKey = k.PublicKey
|
|
wire := make([]byte, DefaultMsgSize)
|
|
n, err := packKeyWire(keywire, wire)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
wire = wire[:n]
|
|
|
|
owner := make([]byte, 255)
|
|
off, err1 := PackDomainName(strings.ToLower(k.Hdr.Name), owner, 0, nil, false)
|
|
if err1 != nil {
|
|
return nil
|
|
}
|
|
owner = owner[:off]
|
|
// RFC4034:
|
|
// digest = digest_algorithm( DNSKEY owner name | DNSKEY RDATA);
|
|
// "|" denotes concatenation
|
|
// DNSKEY RDATA = Flags | Protocol | Algorithm | Public Key.
|
|
|
|
var hash crypto.Hash
|
|
switch h {
|
|
case SHA1:
|
|
hash = crypto.SHA1
|
|
case SHA256:
|
|
hash = crypto.SHA256
|
|
case SHA384:
|
|
hash = crypto.SHA384
|
|
case SHA512:
|
|
hash = crypto.SHA512
|
|
default:
|
|
return nil
|
|
}
|
|
|
|
s := hash.New()
|
|
s.Write(owner)
|
|
s.Write(wire)
|
|
ds.Digest = hex.EncodeToString(s.Sum(nil))
|
|
return ds
|
|
}
|
|
|
|
// ToCDNSKEY converts a DNSKEY record to a CDNSKEY record.
|
|
func (k *DNSKEY) ToCDNSKEY() *CDNSKEY {
|
|
c := &CDNSKEY{DNSKEY: *k}
|
|
c.Hdr = k.Hdr
|
|
c.Hdr.Rrtype = TypeCDNSKEY
|
|
return c
|
|
}
|
|
|
|
// ToCDS converts a DS record to a CDS record.
|
|
func (d *DS) ToCDS() *CDS {
|
|
c := &CDS{DS: *d}
|
|
c.Hdr = d.Hdr
|
|
c.Hdr.Rrtype = TypeCDS
|
|
return c
|
|
}
|
|
|
|
// Sign signs an RRSet. The signature needs to be filled in with the values:
|
|
// Inception, Expiration, KeyTag, SignerName and Algorithm. The rest is copied
|
|
// from the RRset. Sign returns a non-nill error when the signing went OK.
|
|
// There is no check if RRSet is a proper (RFC 2181) RRSet. If OrigTTL is non
|
|
// zero, it is used as-is, otherwise the TTL of the RRset is used as the
|
|
// OrigTTL.
|
|
func (rr *RRSIG) Sign(k crypto.Signer, rrset []RR) error {
|
|
if k == nil {
|
|
return ErrPrivKey
|
|
}
|
|
// s.Inception and s.Expiration may be 0 (rollover etc.), the rest must be set
|
|
if rr.KeyTag == 0 || len(rr.SignerName) == 0 || rr.Algorithm == 0 {
|
|
return ErrKey
|
|
}
|
|
|
|
h0 := rrset[0].Header()
|
|
rr.Hdr.Rrtype = TypeRRSIG
|
|
rr.Hdr.Name = h0.Name
|
|
rr.Hdr.Class = h0.Class
|
|
if rr.OrigTtl == 0 { // If set don't override
|
|
rr.OrigTtl = h0.Ttl
|
|
}
|
|
rr.TypeCovered = h0.Rrtype
|
|
rr.Labels = uint8(CountLabel(h0.Name))
|
|
|
|
if strings.HasPrefix(h0.Name, "*") {
|
|
rr.Labels-- // wildcard, remove from label count
|
|
}
|
|
|
|
sigwire := new(rrsigWireFmt)
|
|
sigwire.TypeCovered = rr.TypeCovered
|
|
sigwire.Algorithm = rr.Algorithm
|
|
sigwire.Labels = rr.Labels
|
|
sigwire.OrigTtl = rr.OrigTtl
|
|
sigwire.Expiration = rr.Expiration
|
|
sigwire.Inception = rr.Inception
|
|
sigwire.KeyTag = rr.KeyTag
|
|
// For signing, lowercase this name
|
|
sigwire.SignerName = strings.ToLower(rr.SignerName)
|
|
|
|
// Create the desired binary blob
|
|
signdata := make([]byte, DefaultMsgSize)
|
|
n, err := packSigWire(sigwire, signdata)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
signdata = signdata[:n]
|
|
wire, err := rawSignatureData(rrset, rr)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
hash, ok := AlgorithmToHash[rr.Algorithm]
|
|
if !ok {
|
|
return ErrAlg
|
|
}
|
|
|
|
switch rr.Algorithm {
|
|
case ED25519:
|
|
// ed25519 signs the raw message and performs hashing internally.
|
|
// All other supported signature schemes operate over the pre-hashed
|
|
// message, and thus ed25519 must be handled separately here.
|
|
//
|
|
// The raw message is passed directly into sign and crypto.Hash(0) is
|
|
// used to signal to the crypto.Signer that the data has not been hashed.
|
|
signature, err := sign(k, append(signdata, wire...), crypto.Hash(0), rr.Algorithm)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
rr.Signature = toBase64(signature)
|
|
case RSAMD5, DSA, DSANSEC3SHA1:
|
|
// See RFC 6944.
|
|
return ErrAlg
|
|
default:
|
|
h := hash.New()
|
|
h.Write(signdata)
|
|
h.Write(wire)
|
|
|
|
signature, err := sign(k, h.Sum(nil), hash, rr.Algorithm)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
rr.Signature = toBase64(signature)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func sign(k crypto.Signer, hashed []byte, hash crypto.Hash, alg uint8) ([]byte, error) {
|
|
signature, err := k.Sign(rand.Reader, hashed, hash)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
switch alg {
|
|
case RSASHA1, RSASHA1NSEC3SHA1, RSASHA256, RSASHA512:
|
|
return signature, nil
|
|
|
|
case ECDSAP256SHA256, ECDSAP384SHA384:
|
|
ecdsaSignature := &struct {
|
|
R, S *big.Int
|
|
}{}
|
|
if _, err := asn1.Unmarshal(signature, ecdsaSignature); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var intlen int
|
|
switch alg {
|
|
case ECDSAP256SHA256:
|
|
intlen = 32
|
|
case ECDSAP384SHA384:
|
|
intlen = 48
|
|
}
|
|
|
|
signature := intToBytes(ecdsaSignature.R, intlen)
|
|
signature = append(signature, intToBytes(ecdsaSignature.S, intlen)...)
|
|
return signature, nil
|
|
|
|
// There is no defined interface for what a DSA backed crypto.Signer returns
|
|
case DSA, DSANSEC3SHA1:
|
|
// t := divRoundUp(divRoundUp(p.PublicKey.Y.BitLen(), 8)-64, 8)
|
|
// signature := []byte{byte(t)}
|
|
// signature = append(signature, intToBytes(r1, 20)...)
|
|
// signature = append(signature, intToBytes(s1, 20)...)
|
|
// rr.Signature = signature
|
|
|
|
case ED25519:
|
|
return signature, nil
|
|
}
|
|
|
|
return nil, ErrAlg
|
|
}
|
|
|
|
// Verify validates an RRSet with the signature and key. This is only the
|
|
// cryptographic test, the signature validity period must be checked separately.
|
|
// This function copies the rdata of some RRs (to lowercase domain names) for the validation to work.
|
|
func (rr *RRSIG) Verify(k *DNSKEY, rrset []RR) error {
|
|
// First the easy checks
|
|
if !IsRRset(rrset) {
|
|
return ErrRRset
|
|
}
|
|
if rr.KeyTag != k.KeyTag() {
|
|
return ErrKey
|
|
}
|
|
if rr.Hdr.Class != k.Hdr.Class {
|
|
return ErrKey
|
|
}
|
|
if rr.Algorithm != k.Algorithm {
|
|
return ErrKey
|
|
}
|
|
if !strings.EqualFold(rr.SignerName, k.Hdr.Name) {
|
|
return ErrKey
|
|
}
|
|
if k.Protocol != 3 {
|
|
return ErrKey
|
|
}
|
|
|
|
// IsRRset checked that we have at least one RR and that the RRs in
|
|
// the set have consistent type, class, and name. Also check that type and
|
|
// class matches the RRSIG record.
|
|
if h0 := rrset[0].Header(); h0.Class != rr.Hdr.Class || h0.Rrtype != rr.TypeCovered {
|
|
return ErrRRset
|
|
}
|
|
|
|
// RFC 4035 5.3.2. Reconstructing the Signed Data
|
|
// Copy the sig, except the rrsig data
|
|
sigwire := new(rrsigWireFmt)
|
|
sigwire.TypeCovered = rr.TypeCovered
|
|
sigwire.Algorithm = rr.Algorithm
|
|
sigwire.Labels = rr.Labels
|
|
sigwire.OrigTtl = rr.OrigTtl
|
|
sigwire.Expiration = rr.Expiration
|
|
sigwire.Inception = rr.Inception
|
|
sigwire.KeyTag = rr.KeyTag
|
|
sigwire.SignerName = strings.ToLower(rr.SignerName)
|
|
// Create the desired binary blob
|
|
signeddata := make([]byte, DefaultMsgSize)
|
|
n, err := packSigWire(sigwire, signeddata)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
signeddata = signeddata[:n]
|
|
wire, err := rawSignatureData(rrset, rr)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
sigbuf := rr.sigBuf() // Get the binary signature data
|
|
if rr.Algorithm == PRIVATEDNS { // PRIVATEOID
|
|
// TODO(miek)
|
|
// remove the domain name and assume its ours?
|
|
}
|
|
|
|
hash, ok := AlgorithmToHash[rr.Algorithm]
|
|
if !ok {
|
|
return ErrAlg
|
|
}
|
|
|
|
switch rr.Algorithm {
|
|
case RSASHA1, RSASHA1NSEC3SHA1, RSASHA256, RSASHA512, RSAMD5:
|
|
// TODO(mg): this can be done quicker, ie. cache the pubkey data somewhere??
|
|
pubkey := k.publicKeyRSA() // Get the key
|
|
if pubkey == nil {
|
|
return ErrKey
|
|
}
|
|
|
|
h := hash.New()
|
|
h.Write(signeddata)
|
|
h.Write(wire)
|
|
return rsa.VerifyPKCS1v15(pubkey, hash, h.Sum(nil), sigbuf)
|
|
|
|
case ECDSAP256SHA256, ECDSAP384SHA384:
|
|
pubkey := k.publicKeyECDSA()
|
|
if pubkey == nil {
|
|
return ErrKey
|
|
}
|
|
|
|
// Split sigbuf into the r and s coordinates
|
|
r := new(big.Int).SetBytes(sigbuf[:len(sigbuf)/2])
|
|
s := new(big.Int).SetBytes(sigbuf[len(sigbuf)/2:])
|
|
|
|
h := hash.New()
|
|
h.Write(signeddata)
|
|
h.Write(wire)
|
|
if ecdsa.Verify(pubkey, h.Sum(nil), r, s) {
|
|
return nil
|
|
}
|
|
return ErrSig
|
|
|
|
case ED25519:
|
|
pubkey := k.publicKeyED25519()
|
|
if pubkey == nil {
|
|
return ErrKey
|
|
}
|
|
|
|
if ed25519.Verify(pubkey, append(signeddata, wire...), sigbuf) {
|
|
return nil
|
|
}
|
|
return ErrSig
|
|
|
|
default:
|
|
return ErrAlg
|
|
}
|
|
}
|
|
|
|
// ValidityPeriod uses RFC1982 serial arithmetic to calculate
|
|
// if a signature period is valid. If t is the zero time, the
|
|
// current time is taken other t is. Returns true if the signature
|
|
// is valid at the given time, otherwise returns false.
|
|
func (rr *RRSIG) ValidityPeriod(t time.Time) bool {
|
|
var utc int64
|
|
if t.IsZero() {
|
|
utc = time.Now().UTC().Unix()
|
|
} else {
|
|
utc = t.UTC().Unix()
|
|
}
|
|
modi := (int64(rr.Inception) - utc) / year68
|
|
mode := (int64(rr.Expiration) - utc) / year68
|
|
ti := int64(rr.Inception) + modi*year68
|
|
te := int64(rr.Expiration) + mode*year68
|
|
return ti <= utc && utc <= te
|
|
}
|
|
|
|
// Return the signatures base64 encodedig sigdata as a byte slice.
|
|
func (rr *RRSIG) sigBuf() []byte {
|
|
sigbuf, err := fromBase64([]byte(rr.Signature))
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
return sigbuf
|
|
}
|
|
|
|
// publicKeyRSA returns the RSA public key from a DNSKEY record.
|
|
func (k *DNSKEY) publicKeyRSA() *rsa.PublicKey {
|
|
keybuf, err := fromBase64([]byte(k.PublicKey))
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
|
|
if len(keybuf) < 1+1+64 {
|
|
// Exponent must be at least 1 byte and modulus at least 64
|
|
return nil
|
|
}
|
|
|
|
// RFC 2537/3110, section 2. RSA Public KEY Resource Records
|
|
// Length is in the 0th byte, unless its zero, then it
|
|
// it in bytes 1 and 2 and its a 16 bit number
|
|
explen := uint16(keybuf[0])
|
|
keyoff := 1
|
|
if explen == 0 {
|
|
explen = uint16(keybuf[1])<<8 | uint16(keybuf[2])
|
|
keyoff = 3
|
|
}
|
|
|
|
if explen > 4 || explen == 0 || keybuf[keyoff] == 0 {
|
|
// Exponent larger than supported by the crypto package,
|
|
// empty, or contains prohibited leading zero.
|
|
return nil
|
|
}
|
|
|
|
modoff := keyoff + int(explen)
|
|
modlen := len(keybuf) - modoff
|
|
if modlen < 64 || modlen > 512 || keybuf[modoff] == 0 {
|
|
// Modulus is too small, large, or contains prohibited leading zero.
|
|
return nil
|
|
}
|
|
|
|
pubkey := new(rsa.PublicKey)
|
|
|
|
var expo uint64
|
|
// The exponent of length explen is between keyoff and modoff.
|
|
for _, v := range keybuf[keyoff:modoff] {
|
|
expo <<= 8
|
|
expo |= uint64(v)
|
|
}
|
|
if expo > 1<<31-1 {
|
|
// Larger exponent than supported by the crypto package.
|
|
return nil
|
|
}
|
|
|
|
pubkey.E = int(expo)
|
|
pubkey.N = new(big.Int).SetBytes(keybuf[modoff:])
|
|
return pubkey
|
|
}
|
|
|
|
// publicKeyECDSA returns the Curve public key from the DNSKEY record.
|
|
func (k *DNSKEY) publicKeyECDSA() *ecdsa.PublicKey {
|
|
keybuf, err := fromBase64([]byte(k.PublicKey))
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
pubkey := new(ecdsa.PublicKey)
|
|
switch k.Algorithm {
|
|
case ECDSAP256SHA256:
|
|
pubkey.Curve = elliptic.P256()
|
|
if len(keybuf) != 64 {
|
|
// wrongly encoded key
|
|
return nil
|
|
}
|
|
case ECDSAP384SHA384:
|
|
pubkey.Curve = elliptic.P384()
|
|
if len(keybuf) != 96 {
|
|
// Wrongly encoded key
|
|
return nil
|
|
}
|
|
}
|
|
pubkey.X = new(big.Int).SetBytes(keybuf[:len(keybuf)/2])
|
|
pubkey.Y = new(big.Int).SetBytes(keybuf[len(keybuf)/2:])
|
|
return pubkey
|
|
}
|
|
|
|
func (k *DNSKEY) publicKeyDSA() *dsa.PublicKey {
|
|
keybuf, err := fromBase64([]byte(k.PublicKey))
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
if len(keybuf) < 22 {
|
|
return nil
|
|
}
|
|
t, keybuf := int(keybuf[0]), keybuf[1:]
|
|
size := 64 + t*8
|
|
q, keybuf := keybuf[:20], keybuf[20:]
|
|
if len(keybuf) != 3*size {
|
|
return nil
|
|
}
|
|
p, keybuf := keybuf[:size], keybuf[size:]
|
|
g, y := keybuf[:size], keybuf[size:]
|
|
pubkey := new(dsa.PublicKey)
|
|
pubkey.Parameters.Q = new(big.Int).SetBytes(q)
|
|
pubkey.Parameters.P = new(big.Int).SetBytes(p)
|
|
pubkey.Parameters.G = new(big.Int).SetBytes(g)
|
|
pubkey.Y = new(big.Int).SetBytes(y)
|
|
return pubkey
|
|
}
|
|
|
|
func (k *DNSKEY) publicKeyED25519() ed25519.PublicKey {
|
|
keybuf, err := fromBase64([]byte(k.PublicKey))
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
if len(keybuf) != ed25519.PublicKeySize {
|
|
return nil
|
|
}
|
|
return keybuf
|
|
}
|
|
|
|
type wireSlice [][]byte
|
|
|
|
func (p wireSlice) Len() int { return len(p) }
|
|
func (p wireSlice) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
|
|
func (p wireSlice) Less(i, j int) bool {
|
|
_, ioff, _ := UnpackDomainName(p[i], 0)
|
|
_, joff, _ := UnpackDomainName(p[j], 0)
|
|
return bytes.Compare(p[i][ioff+10:], p[j][joff+10:]) < 0
|
|
}
|
|
|
|
// Return the raw signature data.
|
|
func rawSignatureData(rrset []RR, s *RRSIG) (buf []byte, err error) {
|
|
wires := make(wireSlice, len(rrset))
|
|
for i, r := range rrset {
|
|
r1 := r.copy()
|
|
h := r1.Header()
|
|
h.Ttl = s.OrigTtl
|
|
labels := SplitDomainName(h.Name)
|
|
// 6.2. Canonical RR Form. (4) - wildcards
|
|
if len(labels) > int(s.Labels) {
|
|
// Wildcard
|
|
h.Name = "*." + strings.Join(labels[len(labels)-int(s.Labels):], ".") + "."
|
|
}
|
|
// RFC 4034: 6.2. Canonical RR Form. (2) - domain name to lowercase
|
|
h.Name = strings.ToLower(h.Name)
|
|
// 6.2. Canonical RR Form. (3) - domain rdata to lowercase.
|
|
// NS, MD, MF, CNAME, SOA, MB, MG, MR, PTR,
|
|
// HINFO, MINFO, MX, RP, AFSDB, RT, SIG, PX, NXT, NAPTR, KX,
|
|
// SRV, DNAME, A6
|
|
//
|
|
// RFC 6840 - Clarifications and Implementation Notes for DNS Security (DNSSEC):
|
|
// Section 6.2 of [RFC4034] also erroneously lists HINFO as a record
|
|
// that needs conversion to lowercase, and twice at that. Since HINFO
|
|
// records contain no domain names, they are not subject to case
|
|
// conversion.
|
|
switch x := r1.(type) {
|
|
case *NS:
|
|
x.Ns = strings.ToLower(x.Ns)
|
|
case *MD:
|
|
x.Md = strings.ToLower(x.Md)
|
|
case *MF:
|
|
x.Mf = strings.ToLower(x.Mf)
|
|
case *CNAME:
|
|
x.Target = strings.ToLower(x.Target)
|
|
case *SOA:
|
|
x.Ns = strings.ToLower(x.Ns)
|
|
x.Mbox = strings.ToLower(x.Mbox)
|
|
case *MB:
|
|
x.Mb = strings.ToLower(x.Mb)
|
|
case *MG:
|
|
x.Mg = strings.ToLower(x.Mg)
|
|
case *MR:
|
|
x.Mr = strings.ToLower(x.Mr)
|
|
case *PTR:
|
|
x.Ptr = strings.ToLower(x.Ptr)
|
|
case *MINFO:
|
|
x.Rmail = strings.ToLower(x.Rmail)
|
|
x.Email = strings.ToLower(x.Email)
|
|
case *MX:
|
|
x.Mx = strings.ToLower(x.Mx)
|
|
case *RP:
|
|
x.Mbox = strings.ToLower(x.Mbox)
|
|
x.Txt = strings.ToLower(x.Txt)
|
|
case *AFSDB:
|
|
x.Hostname = strings.ToLower(x.Hostname)
|
|
case *RT:
|
|
x.Host = strings.ToLower(x.Host)
|
|
case *SIG:
|
|
x.SignerName = strings.ToLower(x.SignerName)
|
|
case *PX:
|
|
x.Map822 = strings.ToLower(x.Map822)
|
|
x.Mapx400 = strings.ToLower(x.Mapx400)
|
|
case *NAPTR:
|
|
x.Replacement = strings.ToLower(x.Replacement)
|
|
case *KX:
|
|
x.Exchanger = strings.ToLower(x.Exchanger)
|
|
case *SRV:
|
|
x.Target = strings.ToLower(x.Target)
|
|
case *DNAME:
|
|
x.Target = strings.ToLower(x.Target)
|
|
}
|
|
// 6.2. Canonical RR Form. (5) - origTTL
|
|
wire := make([]byte, Len(r1)+1) // +1 to be safe(r)
|
|
off, err1 := PackRR(r1, wire, 0, nil, false)
|
|
if err1 != nil {
|
|
return nil, err1
|
|
}
|
|
wire = wire[:off]
|
|
wires[i] = wire
|
|
}
|
|
sort.Sort(wires)
|
|
for i, wire := range wires {
|
|
if i > 0 && bytes.Equal(wire, wires[i-1]) {
|
|
continue
|
|
}
|
|
buf = append(buf, wire...)
|
|
}
|
|
return buf, nil
|
|
}
|
|
|
|
func packSigWire(sw *rrsigWireFmt, msg []byte) (int, error) {
|
|
// copied from zmsg.go RRSIG packing
|
|
off, err := packUint16(sw.TypeCovered, msg, 0)
|
|
if err != nil {
|
|
return off, err
|
|
}
|
|
off, err = packUint8(sw.Algorithm, msg, off)
|
|
if err != nil {
|
|
return off, err
|
|
}
|
|
off, err = packUint8(sw.Labels, msg, off)
|
|
if err != nil {
|
|
return off, err
|
|
}
|
|
off, err = packUint32(sw.OrigTtl, msg, off)
|
|
if err != nil {
|
|
return off, err
|
|
}
|
|
off, err = packUint32(sw.Expiration, msg, off)
|
|
if err != nil {
|
|
return off, err
|
|
}
|
|
off, err = packUint32(sw.Inception, msg, off)
|
|
if err != nil {
|
|
return off, err
|
|
}
|
|
off, err = packUint16(sw.KeyTag, msg, off)
|
|
if err != nil {
|
|
return off, err
|
|
}
|
|
off, err = PackDomainName(sw.SignerName, msg, off, nil, false)
|
|
if err != nil {
|
|
return off, err
|
|
}
|
|
return off, nil
|
|
}
|
|
|
|
func packKeyWire(dw *dnskeyWireFmt, msg []byte) (int, error) {
|
|
// copied from zmsg.go DNSKEY packing
|
|
off, err := packUint16(dw.Flags, msg, 0)
|
|
if err != nil {
|
|
return off, err
|
|
}
|
|
off, err = packUint8(dw.Protocol, msg, off)
|
|
if err != nil {
|
|
return off, err
|
|
}
|
|
off, err = packUint8(dw.Algorithm, msg, off)
|
|
if err != nil {
|
|
return off, err
|
|
}
|
|
off, err = packStringBase64(dw.PublicKey, msg, off)
|
|
if err != nil {
|
|
return off, err
|
|
}
|
|
return off, nil
|
|
}
|