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431c70e8b9
This is a fixup for https://github.com/coredns/coredns/pull/3310 which replaced some 'iff's with 'if' under the assumption they were typos. I'm fairly confident they were "If and only if" (https://en.wikipedia.org/wiki/If_and_only_if), which is commonly shortened as "iff". I've updated them to the full length 'if, and only if' for the sake of readability. Signed-off-by: Euan Kemp <euan@ngrok.com>
95 lines
2.3 KiB
Go
95 lines
2.3 KiB
Go
package dnssec
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import (
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"crypto"
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"crypto/ecdsa"
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"crypto/rsa"
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"errors"
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"os"
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"time"
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"github.com/coredns/coredns/request"
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"github.com/miekg/dns"
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"golang.org/x/crypto/ed25519"
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)
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// DNSKEY holds a DNSSEC public and private key used for on-the-fly signing.
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type DNSKEY struct {
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K *dns.DNSKEY
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D *dns.DS
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s crypto.Signer
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tag uint16
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}
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// ParseKeyFile read a DNSSEC keyfile as generated by dnssec-keygen or other
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// utilities. It adds ".key" for the public key and ".private" for the private key.
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func ParseKeyFile(pubFile, privFile string) (*DNSKEY, error) {
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f, e := os.Open(pubFile)
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if e != nil {
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return nil, e
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}
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defer f.Close()
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k, e := dns.ReadRR(f, pubFile)
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if e != nil {
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return nil, e
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}
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f, e = os.Open(privFile)
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if e != nil {
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return nil, e
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}
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defer f.Close()
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dk, ok := k.(*dns.DNSKEY)
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if !ok {
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return nil, errors.New("no public key found")
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}
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p, e := dk.ReadPrivateKey(f, privFile)
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if e != nil {
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return nil, e
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}
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if s, ok := p.(*rsa.PrivateKey); ok {
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return &DNSKEY{K: dk, D: dk.ToDS(dns.SHA256), s: s, tag: dk.KeyTag()}, nil
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}
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if s, ok := p.(*ecdsa.PrivateKey); ok {
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return &DNSKEY{K: dk, D: dk.ToDS(dns.SHA256), s: s, tag: dk.KeyTag()}, nil
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}
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if s, ok := p.(ed25519.PrivateKey); ok {
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return &DNSKEY{K: dk, D: dk.ToDS(dns.SHA256), s: s, tag: dk.KeyTag()}, nil
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}
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return &DNSKEY{K: dk, D: dk.ToDS(dns.SHA256), s: nil, tag: 0}, errors.New("no private key found")
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}
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// getDNSKEY returns the correct DNSKEY to the client. Signatures are added when do is true.
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func (d Dnssec) getDNSKEY(state request.Request, zone string, do bool, server string) *dns.Msg {
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keys := make([]dns.RR, len(d.keys))
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for i, k := range d.keys {
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keys[i] = dns.Copy(k.K)
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keys[i].Header().Name = zone
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}
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m := new(dns.Msg)
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m.SetReply(state.Req)
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m.Answer = keys
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if !do {
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return m
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}
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incep, expir := incepExpir(time.Now().UTC())
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if sigs, err := d.sign(keys, zone, 3600, incep, expir, server); err == nil {
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m.Answer = append(m.Answer, sigs...)
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}
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return m
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}
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// Return true if, and only if, this is a zone key with the SEP bit unset. This implies a ZSK (rfc4034 2.1.1).
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func (k DNSKEY) isZSK() bool {
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return k.K.Flags&(1<<8) == (1<<8) && k.K.Flags&1 == 0
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}
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// Return true if, and only if, this is a zone key with the SEP bit set. This implies a KSK (rfc4034 2.1.1).
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func (k DNSKEY) isKSK() bool {
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return k.K.Flags&(1<<8) == (1<<8) && k.K.Flags&1 == 1
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}
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