mirror of https://github.com/slackhq/nebula.git
271 lines
8.0 KiB
Go
271 lines
8.0 KiB
Go
package main
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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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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"math"
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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/ed25519"
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)
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type caFlags struct {
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set *flag.FlagSet
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name *string
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duration *time.Duration
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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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ips *string
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subnets *string
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argonMemory *uint
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argonIterations *uint
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argonParallelism *uint
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encryption *bool
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curve *string
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}
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func newCaFlags() *caFlags {
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cf := caFlags{set: flag.NewFlagSet("ca", flag.ContinueOnError)}
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cf.set.Usage = func() {}
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cf.name = cf.set.String("name", "", "Required: name of the certificate authority")
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cf.duration = cf.set.Duration("duration", time.Duration(time.Hour*8760), "Optional: amount of time the certificate should be valid for. Valid time units are seconds: \"s\", minutes: \"m\", hours: \"h\"")
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cf.outKeyPath = cf.set.String("out-key", "ca.key", "Optional: path to write the private key to")
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cf.outCertPath = cf.set.String("out-crt", "ca.crt", "Optional: path to write the certificate to")
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cf.outQRPath = cf.set.String("out-qr", "", "Optional: output a qr code image (png) of the certificate")
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cf.groups = cf.set.String("groups", "", "Optional: comma separated list of groups. This will limit which groups subordinate certs can use")
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cf.ips = cf.set.String("ips", "", "Optional: comma separated list of ipv4 address and network in CIDR notation. This will limit which ipv4 addresses and networks subordinate certs can use for ip addresses")
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cf.subnets = cf.set.String("subnets", "", "Optional: comma separated list of ipv4 address and network in CIDR notation. This will limit which ipv4 addresses and networks subordinate certs can use in subnets")
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cf.argonMemory = cf.set.Uint("argon-memory", 2*1024*1024, "Optional: Argon2 memory parameter (in KiB) used for encrypted private key passphrase")
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cf.argonParallelism = cf.set.Uint("argon-parallelism", 4, "Optional: Argon2 parallelism parameter used for encrypted private key passphrase")
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cf.argonIterations = cf.set.Uint("argon-iterations", 1, "Optional: Argon2 iterations parameter used for encrypted private key passphrase")
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cf.encryption = cf.set.Bool("encrypt", false, "Optional: prompt for passphrase and write out-key in an encrypted format")
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cf.curve = cf.set.String("curve", "25519", "EdDSA/ECDSA Curve (25519, P256)")
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return &cf
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}
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func parseArgonParameters(memory uint, parallelism uint, iterations uint) (*cert.Argon2Parameters, error) {
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if memory <= 0 || memory > math.MaxUint32 {
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return nil, newHelpErrorf("-argon-memory must be be greater than 0 and no more than %d KiB", uint32(math.MaxUint32))
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}
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if parallelism <= 0 || parallelism > math.MaxUint8 {
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return nil, newHelpErrorf("-argon-parallelism must be be greater than 0 and no more than %d", math.MaxUint8)
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}
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if iterations <= 0 || iterations > math.MaxUint32 {
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return nil, newHelpErrorf("-argon-iterations must be be greater than 0 and no more than %d", uint32(math.MaxUint32))
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}
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return cert.NewArgon2Parameters(uint32(memory), uint8(parallelism), uint32(iterations)), nil
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}
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func ca(args []string, out io.Writer, errOut io.Writer, pr PasswordReader) error {
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cf := newCaFlags()
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err := cf.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("name", cf.name); err != nil {
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return err
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}
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if err := mustFlagString("out-key", cf.outKeyPath); err != nil {
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return err
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}
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if err := mustFlagString("out-crt", cf.outCertPath); err != nil {
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return err
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}
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var kdfParams *cert.Argon2Parameters
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if *cf.encryption {
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if kdfParams, err = parseArgonParameters(*cf.argonMemory, *cf.argonParallelism, *cf.argonIterations); err != nil {
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return err
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}
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}
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if *cf.duration <= 0 {
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return &helpError{"-duration must be greater than 0"}
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}
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var groups []string
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if *cf.groups != "" {
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for _, rg := range strings.Split(*cf.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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var ips []*net.IPNet
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if *cf.ips != "" {
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for _, rs := range strings.Split(*cf.ips, ",") {
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rs := strings.Trim(rs, " ")
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if rs != "" {
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ip, ipNet, err := net.ParseCIDR(rs)
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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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if ip.To4() == nil {
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return newHelpErrorf("invalid ip definition: can only be ipv4, have %s", rs)
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}
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ipNet.IP = ip
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ips = append(ips, ipNet)
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}
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}
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}
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var subnets []*net.IPNet
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if *cf.subnets != "" {
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for _, rs := range strings.Split(*cf.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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if s.IP.To4() == nil {
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return newHelpErrorf("invalid subnet definition: can only be ipv4, have %s", rs)
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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 passphrase []byte
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if *cf.encryption {
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for i := 0; i < 5; i++ {
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out.Write([]byte("Enter passphrase: "))
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passphrase, err = pr.ReadPassword()
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if err == ErrNoTerminal {
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return fmt.Errorf("out-key must be encrypted interactively")
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} else if err != nil {
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return fmt.Errorf("error reading passphrase: %s", err)
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}
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if len(passphrase) > 0 {
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break
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}
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}
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if len(passphrase) == 0 {
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return fmt.Errorf("no passphrase specified, remove -encrypt flag to write out-key in plaintext")
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}
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}
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var curve cert.Curve
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var pub, rawPriv []byte
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switch *cf.curve {
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case "25519", "X25519", "Curve25519", "CURVE25519":
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curve = cert.Curve_CURVE25519
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pub, rawPriv, err = ed25519.GenerateKey(rand.Reader)
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if err != nil {
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return fmt.Errorf("error while generating ed25519 keys: %s", err)
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}
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case "P256":
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var key *ecdsa.PrivateKey
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curve = cert.Curve_P256
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key, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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if err != nil {
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return fmt.Errorf("error while generating ecdsa keys: %s", err)
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}
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// ecdh.PrivateKey lets us get at the encoded bytes, even though
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// we aren't using ECDH here.
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eKey, err := key.ECDH()
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if err != nil {
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return fmt.Errorf("error while converting ecdsa key: %s", err)
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}
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rawPriv = eKey.Bytes()
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pub = eKey.PublicKey().Bytes()
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}
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nc := cert.NebulaCertificate{
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Details: cert.NebulaCertificateDetails{
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Name: *cf.name,
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Groups: groups,
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Ips: ips,
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Subnets: subnets,
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NotBefore: time.Now(),
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NotAfter: time.Now().Add(*cf.duration),
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PublicKey: pub,
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IsCA: true,
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Curve: curve,
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},
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}
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if _, err := os.Stat(*cf.outKeyPath); err == nil {
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return fmt.Errorf("refusing to overwrite existing CA key: %s", *cf.outKeyPath)
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}
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if _, err := os.Stat(*cf.outCertPath); err == nil {
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return fmt.Errorf("refusing to overwrite existing CA cert: %s", *cf.outCertPath)
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}
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err = nc.Sign(curve, rawPriv)
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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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var b []byte
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if *cf.encryption {
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b, err = cert.EncryptAndMarshalSigningPrivateKey(curve, rawPriv, passphrase, kdfParams)
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if err != nil {
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return fmt.Errorf("error while encrypting out-key: %s", err)
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}
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} else {
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b = cert.MarshalSigningPrivateKey(curve, rawPriv)
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}
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err = os.WriteFile(*cf.outKeyPath, b, 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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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 = os.WriteFile(*cf.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 *cf.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 = os.WriteFile(*cf.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 caSummary() string {
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return "ca <flags>: create a self signed certificate authority"
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}
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func caHelp(out io.Writer) {
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cf := newCaFlags()
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out.Write([]byte("Usage of " + os.Args[0] + " " + caSummary() + "\n"))
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cf.set.SetOutput(out)
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cf.set.PrintDefaults()
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}
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