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package dns import ( "crypto" "crypto/ecdsa" "crypto/rsa" "encoding/binary" "math/big" "strings" "time" ) // Sign signs a dns.Msg. It fills the signature with the appropriate data. // The SIG record should have the SignerName, KeyTag, Algorithm, Inception // and Expiration set. func (rr *SIG) Sign(k crypto.Signer, m *Msg) ([]byte, error) { if k == nil { return nil, ErrPrivKey } if rr.KeyTag == 0 || rr.SignerName == "" || rr.Algorithm == 0 { return nil, ErrKey } rr.Hdr = RR_Header{Name: ".", Rrtype: TypeSIG, Class: ClassANY, Ttl: 0} rr.OrigTtl, rr.TypeCovered, rr.Labels = 0, 0, 0 buf := make([]byte, m.Len()+Len(rr)) mbuf, err := m.PackBuffer(buf) if err != nil { return nil, err } if &buf[0] != &mbuf[0] { return nil, ErrBuf } off, err := PackRR(rr, buf, len(mbuf), nil, false) if err != nil { return nil, err } buf = buf[:off:cap(buf)] hash, ok := AlgorithmToHash[rr.Algorithm] if !ok { return nil, ErrAlg } hasher := hash.New() // Write SIG rdata hasher.Write(buf[len(mbuf)+1+2+2+4+2:]) // Write message hasher.Write(buf[:len(mbuf)]) signature, err := sign(k, hasher.Sum(nil), hash, rr.Algorithm) if err != nil { return nil, err } rr.Signature = toBase64(signature) buf = append(buf, signature...) if len(buf) > int(^uint16(0)) { return nil, ErrBuf } // Adjust sig data length rdoff := len(mbuf) + 1 + 2 + 2 + 4 rdlen := binary.BigEndian.Uint16(buf[rdoff:]) rdlen += uint16(len(signature)) binary.BigEndian.PutUint16(buf[rdoff:], rdlen) // Adjust additional count adc := binary.BigEndian.Uint16(buf[10:]) adc++ binary.BigEndian.PutUint16(buf[10:], adc) return buf, nil } // Verify validates the message buf using the key k. // It's assumed that buf is a valid message from which rr was unpacked. func (rr *SIG) Verify(k *KEY, buf []byte) error { if k == nil { return ErrKey } if rr.KeyTag == 0 || rr.SignerName == "" || rr.Algorithm == 0 { return ErrKey } var hash crypto.Hash switch rr.Algorithm { case RSASHA1: hash = crypto.SHA1 case RSASHA256, ECDSAP256SHA256: hash = crypto.SHA256 case ECDSAP384SHA384: hash = crypto.SHA384 case RSASHA512: hash = crypto.SHA512 default: return ErrAlg } hasher := hash.New() buflen := len(buf) qdc := binary.BigEndian.Uint16(buf[4:]) anc := binary.BigEndian.Uint16(buf[6:]) auc := binary.BigEndian.Uint16(buf[8:]) adc := binary.BigEndian.Uint16(buf[10:]) offset := headerSize var err error for i := uint16(0); i < qdc && offset < buflen; i++ { _, offset, err = UnpackDomainName(buf, offset) if err != nil { return err } // Skip past Type and Class offset += 2 + 2 } for i := uint16(1); i < anc+auc+adc && offset < buflen; i++ { _, offset, err = UnpackDomainName(buf, offset) if err != nil { return err } // Skip past Type, Class and TTL offset += 2 + 2 + 4 if offset+1 >= buflen { continue } rdlen := binary.BigEndian.Uint16(buf[offset:]) offset += 2 offset += int(rdlen) } if offset >= buflen { return &Error{err: "overflowing unpacking signed message"} } // offset should be just prior to SIG bodyend := offset // owner name SHOULD be root _, offset, err = UnpackDomainName(buf, offset) if err != nil { return err } // Skip Type, Class, TTL, RDLen offset += 2 + 2 + 4 + 2 sigstart := offset // Skip Type Covered, Algorithm, Labels, Original TTL offset += 2 + 1 + 1 + 4 if offset+4+4 >= buflen { return &Error{err: "overflow unpacking signed message"} } expire := binary.BigEndian.Uint32(buf[offset:]) offset += 4 incept := binary.BigEndian.Uint32(buf[offset:]) offset += 4 now := uint32(time.Now().Unix()) if now < incept || now > expire { return ErrTime } // Skip key tag offset += 2 var signername string signername, offset, err = UnpackDomainName(buf, offset) if err != nil { return err } // If key has come from the DNS name compression might // have mangled the case of the name if !strings.EqualFold(signername, k.Header().Name) { return &Error{err: "signer name doesn't match key name"} } sigend := offset hasher.Write(buf[sigstart:sigend]) hasher.Write(buf[:10]) hasher.Write([]byte{ byte((adc - 1) << 8), byte(adc - 1), }) hasher.Write(buf[12:bodyend]) hashed := hasher.Sum(nil) sig := buf[sigend:] switch k.Algorithm { case RSASHA1, RSASHA256, RSASHA512: pk := k.publicKeyRSA() if pk != nil { return rsa.VerifyPKCS1v15(pk, hash, hashed, sig) } case ECDSAP256SHA256, ECDSAP384SHA384: pk := k.publicKeyECDSA() r := new(big.Int).SetBytes(sig[:len(sig)/2]) s := new(big.Int).SetBytes(sig[len(sig)/2:]) if pk != nil { if ecdsa.Verify(pk, hashed, r, s) { return nil } return ErrSig } } return ErrKeyAlg }