Add util/pki for creating and signing certificates (#1555)
This commit is contained in:
Jake Sanders
GitHub
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211fd9b9a3
commit
05d2b34e10
85
util/pki/certoptions.go
Normal file
85
util/pki/certoptions.go
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@ -0,0 +1,85 @@
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package pki
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import (
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"crypto/ed25519"
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"crypto/x509"
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"crypto/x509/pkix"
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"math/big"
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"net"
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"time"
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)
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// CertOptions are passed to cert options
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type CertOptions struct {
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IsCA bool
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Subject pkix.Name
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DNSNames []string
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IPAddresses []net.IP
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SerialNumber *big.Int
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NotBefore time.Time
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NotAfter time.Time
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Parent *x509.Certificate
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Pub ed25519.PublicKey
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Priv ed25519.PrivateKey
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}
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// CertOption sets CertOptions
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type CertOption func(c *CertOptions)
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// Subject sets the Subject field
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func Subject(subject pkix.Name) CertOption {
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return func(c *CertOptions) {
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c.Subject = subject
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}
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}
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// IsCA states the cert is a CA
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func IsCA() CertOption {
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return func(c *CertOptions) {
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c.IsCA = true
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}
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}
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// DNSNames is a list of hosts to sign in to the certificate
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func DNSNames(names ...string) CertOption {
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return func(c *CertOptions) {
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c.DNSNames = names
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}
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}
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// IPAddresses is a list of IPs to sign in to the certificate
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func IPAddresses(ips ...net.IP) CertOption {
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return func(c *CertOptions) {
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c.IPAddresses = ips
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}
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}
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// KeyPair is the key pair to sign the certificate with
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func KeyPair(pub ed25519.PublicKey, priv ed25519.PrivateKey) CertOption {
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return func(c *CertOptions) {
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c.Pub = pub
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c.Priv = priv
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}
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}
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// SerialNumber is the Certificate Serial number
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func SerialNumber(serial *big.Int) CertOption {
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return func(c *CertOptions) {
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c.SerialNumber = serial
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}
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}
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// NotBefore is the time the certificate is not valid before
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func NotBefore(time time.Time) CertOption {
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return func(c *CertOptions) {
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c.NotBefore = time
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}
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}
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// NotAfter is the time the certificate is not valid after
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func NotAfter(time time.Time) CertOption {
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return func(c *CertOptions) {
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c.NotAfter = time
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}
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}
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164
util/pki/pki.go
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164
util/pki/pki.go
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@ -0,0 +1,164 @@
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// Package pki provides PKI all the PKI functions necessary to run micro over an untrusted network
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// including a CA
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package pki
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import (
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"bytes"
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"crypto/ed25519"
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"crypto/rand"
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"crypto/x509"
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"encoding/pem"
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"github.com/pkg/errors"
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)
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// GenerateKey returns an ed25519 key
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func GenerateKey() (ed25519.PublicKey, ed25519.PrivateKey, error) {
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return ed25519.GenerateKey(rand.Reader)
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}
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// CA generates a self signed CA and returns cert, key in PEM format
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func CA(opts ...CertOption) ([]byte, []byte, error) {
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opts = append(opts, IsCA())
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options := CertOptions{}
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for _, o := range opts {
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o(&options)
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}
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template := &x509.Certificate{
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SignatureAlgorithm: x509.PureEd25519,
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Subject: options.Subject,
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DNSNames: options.DNSNames,
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IPAddresses: options.IPAddresses,
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KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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NotBefore: options.NotBefore,
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NotAfter: options.NotAfter,
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SerialNumber: options.SerialNumber,
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BasicConstraintsValid: true,
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}
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if options.IsCA {
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template.IsCA = true
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template.KeyUsage |= x509.KeyUsageCertSign
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}
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x509Cert, err := x509.CreateCertificate(rand.Reader, template, template, options.Pub, options.Priv)
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if err != nil {
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return nil, nil, err
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}
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cert, key := &bytes.Buffer{}, &bytes.Buffer{}
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if err := pem.Encode(cert, &pem.Block{Type: "CERTIFICATE", Bytes: x509Cert}); err != nil {
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return nil, nil, err
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}
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x509Key, err := x509.MarshalPKCS8PrivateKey(options.Priv)
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if err != nil {
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return nil, nil, err
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}
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if err := pem.Encode(key, &pem.Block{Type: "PRIVATE KEY", Bytes: x509Key}); err != nil {
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return nil, nil, err
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}
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return cert.Bytes(), key.Bytes(), nil
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}
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// CSR generates a certificate request in PEM format
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func CSR(opts ...CertOption) ([]byte, error) {
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options := CertOptions{}
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for _, o := range opts {
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o(&options)
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}
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csrTemplate := &x509.CertificateRequest{
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Subject: options.Subject,
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SignatureAlgorithm: x509.PureEd25519,
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DNSNames: options.DNSNames,
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IPAddresses: options.IPAddresses,
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}
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out := &bytes.Buffer{}
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csr, err := x509.CreateCertificateRequest(rand.Reader, csrTemplate, options.Priv)
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if err != nil {
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return nil, err
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}
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if err := pem.Encode(out, &pem.Block{Type: "CERTIFICATE REQUEST", Bytes: csr}); err != nil {
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return nil, err
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}
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return out.Bytes(), nil
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}
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// Sign decodes a CSR and signs it with the CA
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func Sign(CACrt, CAKey, CSR []byte, opts ...CertOption) ([]byte, error) {
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options := CertOptions{}
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for _, o := range opts {
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o(&options)
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}
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asn1CACrt, err := decodePEM(CACrt)
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if err != nil {
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return nil, errors.Wrap(err, "failed to decode CA Crt PEM")
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}
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if len(asn1CACrt) != 1 {
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return nil, errors.Errorf("expected 1 CA Crt, got %d", len(asn1CACrt))
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}
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caCrt, err := x509.ParseCertificate(asn1CACrt[0].Bytes)
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if err != nil {
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return nil, errors.Wrap(err, "ca is not a valid certificate")
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}
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asn1CAKey, err := decodePEM(CAKey)
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if err != nil {
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return nil, errors.Wrap(err, "failed to decode CA Key PEM")
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}
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if len(asn1CAKey) != 1 {
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return nil, errors.Errorf("expected 1 CA Key, got %d", len(asn1CACrt))
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}
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caKey, err := x509.ParsePKCS8PrivateKey(asn1CAKey[0].Bytes)
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if err != nil {
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return nil, errors.Wrap(err, "ca key is not a valid private key")
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}
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asn1CSR, err := decodePEM(CSR)
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if err != nil {
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return nil, errors.Wrap(err, "failed to decode CSR PEM")
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}
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if len(asn1CSR) != 1 {
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return nil, errors.Errorf("expected 1 CSR, got %d", len(asn1CSR))
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}
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csr, err := x509.ParseCertificateRequest(asn1CSR[0].Bytes)
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if err != nil {
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return nil, errors.Wrap(err, "csr is invalid")
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}
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template := &x509.Certificate{
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SignatureAlgorithm: x509.PureEd25519,
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Subject: csr.Subject,
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DNSNames: csr.DNSNames,
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IPAddresses: csr.IPAddresses,
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KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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NotBefore: options.NotBefore,
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NotAfter: options.NotAfter,
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SerialNumber: options.SerialNumber,
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BasicConstraintsValid: true,
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}
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x509Cert, err := x509.CreateCertificate(rand.Reader, template, caCrt, caCrt.PublicKey, caKey)
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if err != nil {
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return nil, errors.Wrap(err, "Couldn't sign certificate")
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}
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out := &bytes.Buffer{}
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if err := pem.Encode(out, &pem.Block{Type: "CERTIFICATE", Bytes: x509Cert}); err != nil {
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return nil, errors.Wrap(err, "couldn't encode cert")
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}
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return out.Bytes(), nil
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}
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func decodePEM(PEM []byte) ([]*pem.Block, error) {
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var blocks []*pem.Block
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var asn1 *pem.Block
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var rest []byte
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for {
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asn1, rest = pem.Decode(PEM)
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if asn1 == nil {
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return nil, errors.New("PEM is not valid")
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}
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blocks = append(blocks, asn1)
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if len(rest) == 0 {
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break
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}
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}
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return blocks, nil
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}
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90
util/pki/pki_test.go
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90
util/pki/pki_test.go
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@ -0,0 +1,90 @@
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package pki
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import (
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"crypto/ed25519"
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"crypto/rand"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"math/big"
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"net"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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)
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func TestPrivateKey(t *testing.T) {
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_, _, err := GenerateKey()
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assert.NoError(t, err)
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}
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func TestCA(t *testing.T) {
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pub, priv, err := GenerateKey()
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assert.NoError(t, err)
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serialNumberMax := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberMax)
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assert.NoError(t, err, "Couldn't generate serial")
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cert, key, err := CA(
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KeyPair(pub, priv),
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Subject(pkix.Name{
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Organization: []string{"test"},
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}),
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DNSNames("localhost"),
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IPAddresses(net.ParseIP("127.0.0.1")),
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SerialNumber(serialNumber),
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NotBefore(time.Now().Add(time.Minute*-1)),
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NotAfter(time.Now().Add(time.Minute)),
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)
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assert.NoError(t, err, "Couldn't sign CA")
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asn1Key, _ := pem.Decode(key)
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assert.NotNil(t, asn1Key, "Couldn't decode key")
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assert.Equal(t, "PRIVATE KEY", asn1Key.Type)
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decodedKey, err := x509.ParsePKCS8PrivateKey(asn1Key.Bytes)
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assert.NoError(t, err, "Couldn't decode ASN1 Key")
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assert.Equal(t, priv, decodedKey.(ed25519.PrivateKey))
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pool := x509.NewCertPool()
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assert.True(t, pool.AppendCertsFromPEM(cert), "Coudn't parse cert")
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asn1Cert, _ := pem.Decode(cert)
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assert.NotNil(t, asn1Cert, "Couldn't parse pem cert")
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x509cert, err := x509.ParseCertificate(asn1Cert.Bytes)
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assert.NoError(t, err, "Couldn't parse asn1 cert")
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chains, err := x509cert.Verify(x509.VerifyOptions{
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Roots: pool,
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})
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assert.NoError(t, err, "Cert didn't verify")
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assert.Len(t, chains, 1, "CA should have 1 cert in chain")
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}
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func TestCSR(t *testing.T) {
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pub, priv, err := GenerateKey()
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assert.NoError(t, err)
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csr, err := CSR(
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Subject(
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pkix.Name{
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CommonName: "testnode",
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Organization: []string{"microtest"},
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OrganizationalUnit: []string{"super-testers"},
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},
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),
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DNSNames("localhost"),
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IPAddresses(net.ParseIP("127.0.0.1")),
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KeyPair(pub, priv),
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)
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assert.NoError(t, err, "CSR couldn't be encoded")
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asn1csr, _ := pem.Decode(csr)
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assert.NotNil(t, asn1csr)
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decodedcsr, err := x509.ParseCertificateRequest(asn1csr.Bytes)
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assert.NoError(t, err)
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expected := pkix.Name{
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CommonName: "testnode",
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Organization: []string{"microtest"},
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OrganizationalUnit: []string{"super-testers"},
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}
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assert.Equal(t, decodedcsr.Subject.String(), expected.String())
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}
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