mirror of https://github.com/slackhq/nebula.git
497 lines
12 KiB
Go
497 lines
12 KiB
Go
package cert
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import (
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"bytes"
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"crypto/ecdh"
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"crypto/ecdsa"
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"crypto/ed25519"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/sha256"
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"encoding/binary"
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"encoding/hex"
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"encoding/json"
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"encoding/pem"
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"fmt"
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"math/big"
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"net"
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"net/netip"
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"time"
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"github.com/slackhq/nebula/pkclient"
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"golang.org/x/crypto/curve25519"
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"google.golang.org/protobuf/proto"
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)
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const publicKeyLen = 32
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type certificateV1 struct {
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details detailsV1
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signature []byte
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}
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type detailsV1 struct {
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Name string
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Ips []netip.Prefix
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Subnets []netip.Prefix
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Groups []string
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NotBefore time.Time
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NotAfter time.Time
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PublicKey []byte
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IsCA bool
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Issuer string
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Curve Curve
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}
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type m map[string]interface{}
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func (nc *certificateV1) Version() Version {
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return Version1
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}
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func (nc *certificateV1) Curve() Curve {
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return nc.details.Curve
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}
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func (nc *certificateV1) Groups() []string {
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return nc.details.Groups
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}
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func (nc *certificateV1) IsCA() bool {
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return nc.details.IsCA
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}
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func (nc *certificateV1) Issuer() string {
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return nc.details.Issuer
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}
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func (nc *certificateV1) Name() string {
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return nc.details.Name
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}
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func (nc *certificateV1) Networks() []netip.Prefix {
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return nc.details.Ips
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}
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func (nc *certificateV1) NotAfter() time.Time {
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return nc.details.NotAfter
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}
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func (nc *certificateV1) NotBefore() time.Time {
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return nc.details.NotBefore
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}
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func (nc *certificateV1) PublicKey() []byte {
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return nc.details.PublicKey
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}
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func (nc *certificateV1) Signature() []byte {
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return nc.signature
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}
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func (nc *certificateV1) UnsafeNetworks() []netip.Prefix {
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return nc.details.Subnets
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}
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func (nc *certificateV1) Fingerprint() (string, error) {
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b, err := nc.Marshal()
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if err != nil {
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return "", err
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}
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sum := sha256.Sum256(b)
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return hex.EncodeToString(sum[:]), nil
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}
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func (nc *certificateV1) CheckSignature(key []byte) bool {
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b, err := proto.Marshal(nc.getRawDetails())
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if err != nil {
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return false
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}
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switch nc.details.Curve {
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case Curve_CURVE25519:
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return ed25519.Verify(key, b, nc.signature)
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case Curve_P256:
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x, y := elliptic.Unmarshal(elliptic.P256(), key)
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pubKey := &ecdsa.PublicKey{Curve: elliptic.P256(), X: x, Y: y}
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hashed := sha256.Sum256(b)
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return ecdsa.VerifyASN1(pubKey, hashed[:], nc.signature)
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default:
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return false
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}
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}
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func (nc *certificateV1) Expired(t time.Time) bool {
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return nc.details.NotBefore.After(t) || nc.details.NotAfter.Before(t)
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}
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func (nc *certificateV1) VerifyPrivateKey(curve Curve, key []byte) error {
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if curve != nc.details.Curve {
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return fmt.Errorf("curve in cert and private key supplied don't match")
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}
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if nc.details.IsCA {
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switch curve {
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case Curve_CURVE25519:
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// the call to PublicKey below will panic slice bounds out of range otherwise
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if len(key) != ed25519.PrivateKeySize {
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return fmt.Errorf("key was not 64 bytes, is invalid ed25519 private key")
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}
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if !ed25519.PublicKey(nc.details.PublicKey).Equal(ed25519.PrivateKey(key).Public()) {
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return fmt.Errorf("public key in cert and private key supplied don't match")
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}
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case Curve_P256:
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privkey, err := ecdh.P256().NewPrivateKey(key)
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if err != nil {
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return fmt.Errorf("cannot parse private key as P256: %w", err)
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}
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pub := privkey.PublicKey().Bytes()
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if !bytes.Equal(pub, nc.details.PublicKey) {
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return fmt.Errorf("public key in cert and private key supplied don't match")
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}
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default:
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return fmt.Errorf("invalid curve: %s", curve)
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}
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return nil
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}
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var pub []byte
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switch curve {
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case Curve_CURVE25519:
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var err error
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pub, err = curve25519.X25519(key, curve25519.Basepoint)
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if err != nil {
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return err
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}
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case Curve_P256:
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privkey, err := ecdh.P256().NewPrivateKey(key)
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if err != nil {
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return err
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}
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pub = privkey.PublicKey().Bytes()
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default:
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return fmt.Errorf("invalid curve: %s", curve)
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}
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if !bytes.Equal(pub, nc.details.PublicKey) {
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return fmt.Errorf("public key in cert and private key supplied don't match")
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}
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return nil
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}
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// getRawDetails marshals the raw details into protobuf ready struct
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func (nc *certificateV1) getRawDetails() *RawNebulaCertificateDetails {
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rd := &RawNebulaCertificateDetails{
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Name: nc.details.Name,
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Groups: nc.details.Groups,
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NotBefore: nc.details.NotBefore.Unix(),
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NotAfter: nc.details.NotAfter.Unix(),
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PublicKey: make([]byte, len(nc.details.PublicKey)),
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IsCA: nc.details.IsCA,
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Curve: nc.details.Curve,
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}
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for _, ipNet := range nc.details.Ips {
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mask := net.CIDRMask(ipNet.Bits(), ipNet.Addr().BitLen())
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rd.Ips = append(rd.Ips, addr2int(ipNet.Addr()), ip2int(mask))
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}
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for _, ipNet := range nc.details.Subnets {
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mask := net.CIDRMask(ipNet.Bits(), ipNet.Addr().BitLen())
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rd.Subnets = append(rd.Subnets, addr2int(ipNet.Addr()), ip2int(mask))
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}
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copy(rd.PublicKey, nc.details.PublicKey[:])
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// I know, this is terrible
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rd.Issuer, _ = hex.DecodeString(nc.details.Issuer)
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return rd
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}
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func (nc *certificateV1) String() string {
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if nc == nil {
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return "Certificate {}\n"
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}
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s := "NebulaCertificate {\n"
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s += "\tDetails {\n"
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s += fmt.Sprintf("\t\tName: %v\n", nc.details.Name)
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if len(nc.details.Ips) > 0 {
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s += "\t\tIps: [\n"
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for _, ip := range nc.details.Ips {
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s += fmt.Sprintf("\t\t\t%v\n", ip.String())
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}
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s += "\t\t]\n"
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} else {
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s += "\t\tIps: []\n"
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}
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if len(nc.details.Subnets) > 0 {
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s += "\t\tSubnets: [\n"
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for _, ip := range nc.details.Subnets {
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s += fmt.Sprintf("\t\t\t%v\n", ip.String())
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}
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s += "\t\t]\n"
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} else {
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s += "\t\tSubnets: []\n"
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}
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if len(nc.details.Groups) > 0 {
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s += "\t\tGroups: [\n"
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for _, g := range nc.details.Groups {
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s += fmt.Sprintf("\t\t\t\"%v\"\n", g)
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}
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s += "\t\t]\n"
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} else {
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s += "\t\tGroups: []\n"
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}
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s += fmt.Sprintf("\t\tNot before: %v\n", nc.details.NotBefore)
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s += fmt.Sprintf("\t\tNot After: %v\n", nc.details.NotAfter)
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s += fmt.Sprintf("\t\tIs CA: %v\n", nc.details.IsCA)
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s += fmt.Sprintf("\t\tIssuer: %s\n", nc.details.Issuer)
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s += fmt.Sprintf("\t\tPublic key: %x\n", nc.details.PublicKey)
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s += fmt.Sprintf("\t\tCurve: %s\n", nc.details.Curve)
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s += "\t}\n"
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fp, err := nc.Fingerprint()
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if err == nil {
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s += fmt.Sprintf("\tFingerprint: %s\n", fp)
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}
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s += fmt.Sprintf("\tSignature: %x\n", nc.Signature())
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s += "}"
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return s
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}
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func (nc *certificateV1) MarshalForHandshakes() ([]byte, error) {
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pubKey := nc.details.PublicKey
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nc.details.PublicKey = nil
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rawCertNoKey, err := nc.Marshal()
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if err != nil {
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return nil, err
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}
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nc.details.PublicKey = pubKey
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return rawCertNoKey, nil
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}
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func (nc *certificateV1) Marshal() ([]byte, error) {
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rc := RawNebulaCertificate{
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Details: nc.getRawDetails(),
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Signature: nc.signature,
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}
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return proto.Marshal(&rc)
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}
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func (nc *certificateV1) MarshalPEM() ([]byte, error) {
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b, err := nc.Marshal()
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if err != nil {
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return nil, err
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}
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return pem.EncodeToMemory(&pem.Block{Type: CertificateBanner, Bytes: b}), nil
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}
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func (nc *certificateV1) MarshalJSON() ([]byte, error) {
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fp, _ := nc.Fingerprint()
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jc := m{
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"details": m{
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"name": nc.details.Name,
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"ips": nc.details.Ips,
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"subnets": nc.details.Subnets,
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"groups": nc.details.Groups,
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"notBefore": nc.details.NotBefore,
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"notAfter": nc.details.NotAfter,
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"publicKey": fmt.Sprintf("%x", nc.details.PublicKey),
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"isCa": nc.details.IsCA,
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"issuer": nc.details.Issuer,
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"curve": nc.details.Curve.String(),
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},
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"fingerprint": fp,
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"signature": fmt.Sprintf("%x", nc.Signature()),
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}
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return json.Marshal(jc)
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}
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func (nc *certificateV1) Copy() Certificate {
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c := &certificateV1{
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details: detailsV1{
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Name: nc.details.Name,
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Groups: make([]string, len(nc.details.Groups)),
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Ips: make([]netip.Prefix, len(nc.details.Ips)),
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Subnets: make([]netip.Prefix, len(nc.details.Subnets)),
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NotBefore: nc.details.NotBefore,
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NotAfter: nc.details.NotAfter,
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PublicKey: make([]byte, len(nc.details.PublicKey)),
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IsCA: nc.details.IsCA,
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Issuer: nc.details.Issuer,
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},
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signature: make([]byte, len(nc.signature)),
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}
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copy(c.signature, nc.signature)
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copy(c.details.Groups, nc.details.Groups)
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copy(c.details.PublicKey, nc.details.PublicKey)
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for i, p := range nc.details.Ips {
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c.details.Ips[i] = p
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}
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for i, p := range nc.details.Subnets {
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c.details.Subnets[i] = p
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}
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return c
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}
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// unmarshalCertificateV1 will unmarshal a protobuf byte representation of a nebula cert
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func unmarshalCertificateV1(b []byte, assertPublicKey bool) (*certificateV1, error) {
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if len(b) == 0 {
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return nil, fmt.Errorf("nil byte array")
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}
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var rc RawNebulaCertificate
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err := proto.Unmarshal(b, &rc)
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if err != nil {
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return nil, err
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}
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if rc.Details == nil {
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return nil, fmt.Errorf("encoded Details was nil")
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}
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if len(rc.Details.Ips)%2 != 0 {
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return nil, fmt.Errorf("encoded IPs should be in pairs, an odd number was found")
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}
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if len(rc.Details.Subnets)%2 != 0 {
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return nil, fmt.Errorf("encoded Subnets should be in pairs, an odd number was found")
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}
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nc := certificateV1{
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details: detailsV1{
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Name: rc.Details.Name,
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Groups: make([]string, len(rc.Details.Groups)),
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Ips: make([]netip.Prefix, len(rc.Details.Ips)/2),
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Subnets: make([]netip.Prefix, len(rc.Details.Subnets)/2),
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NotBefore: time.Unix(rc.Details.NotBefore, 0),
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NotAfter: time.Unix(rc.Details.NotAfter, 0),
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PublicKey: make([]byte, len(rc.Details.PublicKey)),
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IsCA: rc.Details.IsCA,
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Curve: rc.Details.Curve,
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},
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signature: make([]byte, len(rc.Signature)),
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}
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copy(nc.signature, rc.Signature)
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copy(nc.details.Groups, rc.Details.Groups)
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nc.details.Issuer = hex.EncodeToString(rc.Details.Issuer)
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if len(rc.Details.PublicKey) < publicKeyLen && assertPublicKey {
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return nil, fmt.Errorf("public key was fewer than 32 bytes; %v", len(rc.Details.PublicKey))
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}
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copy(nc.details.PublicKey, rc.Details.PublicKey)
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var ip netip.Addr
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for i, rawIp := range rc.Details.Ips {
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if i%2 == 0 {
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ip = int2addr(rawIp)
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} else {
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ones, _ := net.IPMask(int2ip(rawIp)).Size()
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nc.details.Ips[i/2] = netip.PrefixFrom(ip, ones)
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}
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}
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for i, rawIp := range rc.Details.Subnets {
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if i%2 == 0 {
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ip = int2addr(rawIp)
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} else {
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ones, _ := net.IPMask(int2ip(rawIp)).Size()
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nc.details.Subnets[i/2] = netip.PrefixFrom(ip, ones)
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}
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}
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return &nc, nil
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}
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func signV1(t *TBSCertificate, curve Curve, key []byte, client *pkclient.PKClient) (*certificateV1, error) {
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c := &certificateV1{
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details: detailsV1{
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Name: t.Name,
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Ips: t.Networks,
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Subnets: t.UnsafeNetworks,
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Groups: t.Groups,
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NotBefore: t.NotBefore,
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NotAfter: t.NotAfter,
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PublicKey: t.PublicKey,
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IsCA: t.IsCA,
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Curve: t.Curve,
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Issuer: t.issuer,
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},
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}
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b, err := proto.Marshal(c.getRawDetails())
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if err != nil {
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return nil, err
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}
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var sig []byte
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switch curve {
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case Curve_CURVE25519:
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signer := ed25519.PrivateKey(key)
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sig = ed25519.Sign(signer, b)
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case Curve_P256:
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if client != nil {
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sig, err = client.SignASN1(b)
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} else {
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signer := &ecdsa.PrivateKey{
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PublicKey: ecdsa.PublicKey{
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Curve: elliptic.P256(),
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},
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// ref: https://github.com/golang/go/blob/go1.19/src/crypto/x509/sec1.go#L95
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D: new(big.Int).SetBytes(key),
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}
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// ref: https://github.com/golang/go/blob/go1.19/src/crypto/x509/sec1.go#L119
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signer.X, signer.Y = signer.Curve.ScalarBaseMult(key)
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// We need to hash first for ECDSA
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// - https://pkg.go.dev/crypto/ecdsa#SignASN1
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hashed := sha256.Sum256(b)
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sig, err = ecdsa.SignASN1(rand.Reader, signer, hashed[:])
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if err != nil {
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return nil, err
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}
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}
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default:
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return nil, fmt.Errorf("invalid curve: %s", c.details.Curve)
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}
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c.signature = sig
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return c, nil
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}
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func ip2int(ip []byte) uint32 {
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if len(ip) == 16 {
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return binary.BigEndian.Uint32(ip[12:16])
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}
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return binary.BigEndian.Uint32(ip)
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}
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func int2ip(nn uint32) net.IP {
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ip := make(net.IP, net.IPv4len)
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binary.BigEndian.PutUint32(ip, nn)
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return ip
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}
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func addr2int(addr netip.Addr) uint32 {
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b := addr.Unmap().As4()
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return binary.BigEndian.Uint32(b[:])
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}
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func int2addr(nn uint32) netip.Addr {
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ip := [4]byte{}
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binary.BigEndian.PutUint32(ip[:], nn)
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return netip.AddrFrom4(ip).Unmap()
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}
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