247 lines
6.6 KiB
Go
247 lines
6.6 KiB
Go
package main
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import (
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"crypto/rand"
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"flag"
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"fmt"
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"io"
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"io/ioutil"
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"net"
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"os"
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"strings"
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"time"
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"github.com/skip2/go-qrcode"
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"github.com/slackhq/nebula/cert"
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"golang.org/x/crypto/curve25519"
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)
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type signFlags struct {
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set *flag.FlagSet
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caKeyPath *string
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caCertPath *string
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name *string
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ip *string
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duration *time.Duration
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inPubPath *string
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outKeyPath *string
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outCertPath *string
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outQRPath *string
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groups *string
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subnets *string
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}
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func newSignFlags() *signFlags {
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sf := signFlags{set: flag.NewFlagSet("sign", flag.ContinueOnError)}
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sf.set.Usage = func() {}
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sf.caKeyPath = sf.set.String("ca-key", "ca.key", "Optional: path to the signing CA key")
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sf.caCertPath = sf.set.String("ca-crt", "ca.crt", "Optional: path to the signing CA cert")
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sf.name = sf.set.String("name", "", "Required: name of the cert, usually a hostname")
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sf.ip = sf.set.String("ip", "", "Required: ip and network in CIDR notation to assign the cert")
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sf.duration = sf.set.Duration("duration", 0, "Optional: how long the cert should be valid for. The default is 1 second before the signing cert expires. Valid time units are seconds: \"s\", minutes: \"m\", hours: \"h\"")
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sf.inPubPath = sf.set.String("in-pub", "", "Optional (if out-key not set): path to read a previously generated public key")
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sf.outKeyPath = sf.set.String("out-key", "", "Optional (if in-pub not set): path to write the private key to")
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sf.outCertPath = sf.set.String("out-crt", "", "Optional: path to write the certificate to")
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sf.outQRPath = sf.set.String("out-qr", "", "Optional: output a qr code image (png) of the certificate")
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sf.groups = sf.set.String("groups", "", "Optional: comma separated list of groups")
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sf.subnets = sf.set.String("subnets", "", "Optional: comma separated list of subnet this cert can serve for")
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return &sf
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}
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func signCert(args []string, out io.Writer, errOut io.Writer) error {
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sf := newSignFlags()
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err := sf.set.Parse(args)
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if err != nil {
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return err
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}
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if err := mustFlagString("ca-key", sf.caKeyPath); err != nil {
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return err
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}
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if err := mustFlagString("ca-crt", sf.caCertPath); err != nil {
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return err
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}
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if err := mustFlagString("name", sf.name); err != nil {
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return err
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}
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if err := mustFlagString("ip", sf.ip); err != nil {
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return err
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}
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if *sf.inPubPath != "" && *sf.outKeyPath != "" {
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return newHelpErrorf("cannot set both -in-pub and -out-key")
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}
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rawCAKey, err := ioutil.ReadFile(*sf.caKeyPath)
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if err != nil {
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return fmt.Errorf("error while reading ca-key: %s", err)
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}
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caKey, _, err := cert.UnmarshalEd25519PrivateKey(rawCAKey)
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if err != nil {
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return fmt.Errorf("error while parsing ca-key: %s", err)
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}
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rawCACert, err := ioutil.ReadFile(*sf.caCertPath)
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if err != nil {
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return fmt.Errorf("error while reading ca-crt: %s", err)
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}
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caCert, _, err := cert.UnmarshalNebulaCertificateFromPEM(rawCACert)
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if err != nil {
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return fmt.Errorf("error while parsing ca-crt: %s", err)
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}
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if err := caCert.VerifyPrivateKey(caKey); err != nil {
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return fmt.Errorf("refusing to sign, root certificate does not match private key")
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}
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issuer, err := caCert.Sha256Sum()
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if err != nil {
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return fmt.Errorf("error while getting -ca-crt fingerprint: %s", err)
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}
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if caCert.Expired(time.Now()) {
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return fmt.Errorf("ca certificate is expired")
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}
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// if no duration is given, expire one second before the root expires
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if *sf.duration <= 0 {
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*sf.duration = time.Until(caCert.Details.NotAfter) - time.Second*1
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}
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ip, ipNet, err := net.ParseCIDR(*sf.ip)
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if err != nil {
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return newHelpErrorf("invalid ip definition: %s", err)
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}
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ipNet.IP = ip
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groups := []string{}
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if *sf.groups != "" {
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for _, rg := range strings.Split(*sf.groups, ",") {
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g := strings.TrimSpace(rg)
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if g != "" {
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groups = append(groups, g)
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}
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}
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}
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subnets := []*net.IPNet{}
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if *sf.subnets != "" {
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for _, rs := range strings.Split(*sf.subnets, ",") {
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rs := strings.Trim(rs, " ")
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if rs != "" {
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_, s, err := net.ParseCIDR(rs)
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if err != nil {
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return newHelpErrorf("invalid subnet definition: %s", err)
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}
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subnets = append(subnets, s)
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}
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}
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}
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var pub, rawPriv []byte
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if *sf.inPubPath != "" {
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rawPub, err := ioutil.ReadFile(*sf.inPubPath)
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if err != nil {
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return fmt.Errorf("error while reading in-pub: %s", err)
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}
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pub, _, err = cert.UnmarshalX25519PublicKey(rawPub)
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if err != nil {
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return fmt.Errorf("error while parsing in-pub: %s", err)
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}
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} else {
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pub, rawPriv = x25519Keypair()
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}
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nc := cert.NebulaCertificate{
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Details: cert.NebulaCertificateDetails{
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Name: *sf.name,
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Ips: []*net.IPNet{ipNet},
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Groups: groups,
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Subnets: subnets,
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NotBefore: time.Now(),
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NotAfter: time.Now().Add(*sf.duration),
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PublicKey: pub,
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IsCA: false,
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Issuer: issuer,
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},
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}
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if err := nc.CheckRootConstrains(caCert); err != nil {
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return fmt.Errorf("refusing to sign, root certificate constraints violated: %s", err)
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}
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if *sf.outKeyPath == "" {
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*sf.outKeyPath = *sf.name + ".key"
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}
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if *sf.outCertPath == "" {
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*sf.outCertPath = *sf.name + ".crt"
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}
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if _, err := os.Stat(*sf.outCertPath); err == nil {
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return fmt.Errorf("refusing to overwrite existing cert: %s", *sf.outCertPath)
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}
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err = nc.Sign(caKey)
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if err != nil {
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return fmt.Errorf("error while signing: %s", err)
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}
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if *sf.inPubPath == "" {
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if _, err := os.Stat(*sf.outKeyPath); err == nil {
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return fmt.Errorf("refusing to overwrite existing key: %s", *sf.outKeyPath)
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}
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err = ioutil.WriteFile(*sf.outKeyPath, cert.MarshalX25519PrivateKey(rawPriv), 0600)
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if err != nil {
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return fmt.Errorf("error while writing out-key: %s", err)
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}
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}
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b, err := nc.MarshalToPEM()
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if err != nil {
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return fmt.Errorf("error while marshalling certificate: %s", err)
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}
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err = ioutil.WriteFile(*sf.outCertPath, b, 0600)
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if err != nil {
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return fmt.Errorf("error while writing out-crt: %s", err)
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}
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if *sf.outQRPath != "" {
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b, err = qrcode.Encode(string(b), qrcode.Medium, -5)
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if err != nil {
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return fmt.Errorf("error while generating qr code: %s", err)
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}
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err = ioutil.WriteFile(*sf.outQRPath, b, 0600)
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if err != nil {
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return fmt.Errorf("error while writing out-qr: %s", err)
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}
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}
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return nil
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}
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func x25519Keypair() ([]byte, []byte) {
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var pubkey, privkey [32]byte
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if _, err := io.ReadFull(rand.Reader, privkey[:]); err != nil {
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panic(err)
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}
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curve25519.ScalarBaseMult(&pubkey, &privkey)
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return pubkey[:], privkey[:]
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}
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func signSummary() string {
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return "sign <flags>: create and sign a certificate"
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}
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func signHelp(out io.Writer) {
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sf := newSignFlags()
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out.Write([]byte("Usage of " + os.Args[0] + " " + signSummary() + "\n"))
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sf.set.SetOutput(out)
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sf.set.PrintDefaults()
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}
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