576 lines
17 KiB
Go
576 lines
17 KiB
Go
package utils
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import (
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"bytes"
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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/rsa"
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"crypto/tls"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"errors"
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"fmt"
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"math/big"
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"net"
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"os"
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"path/filepath"
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"strings"
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"time"
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"github.com/authelia/authelia/v4/internal/configuration/schema"
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"github.com/authelia/authelia/v4/internal/logging"
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)
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// PEMBlockType represent an enum of the existing PEM block types.
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type PEMBlockType int
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const (
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// Certificate block type.
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Certificate PEMBlockType = iota
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// PrivateKey block type.
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PrivateKey
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)
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// GenerateCertificate generate a certificate given a private key. RSA, Ed25519 and ECDSA are officially supported.
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func GenerateCertificate(privateKeyBuilder PrivateKeyBuilder, hosts []string, validFrom time.Time, validFor time.Duration, isCA bool) ([]byte, []byte, error) {
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privateKey, err := privateKeyBuilder.Build()
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if err != nil {
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return nil, nil, fmt.Errorf("unable to build private key: %w", err)
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}
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notBefore := validFrom
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notAfter := validFrom.Add(validFor)
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
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if err != nil {
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return nil, nil, fmt.Errorf("failed to generate serial number: %v", err)
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}
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template := x509.Certificate{
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SerialNumber: serialNumber,
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Subject: pkix.Name{
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Organization: []string{"Acme Co"},
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},
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NotBefore: notBefore,
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NotAfter: notAfter,
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KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
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BasicConstraintsValid: true,
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}
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for _, h := range hosts {
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if ip := net.ParseIP(h); ip != nil {
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template.IPAddresses = append(template.IPAddresses, ip)
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} else {
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template.DNSNames = append(template.DNSNames, h)
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}
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}
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if isCA {
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template.IsCA = true
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template.KeyUsage |= x509.KeyUsageCertSign
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}
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certDERBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(privateKey), privateKey)
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if err != nil {
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return nil, nil, fmt.Errorf("failed to create certificate: %v", err)
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}
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certPEMBytes, err := ConvertDERToPEM(certDERBytes, Certificate)
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if err != nil {
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return nil, nil, fmt.Errorf("failed to convert certificate in DER format into PEM: %v", err)
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}
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keyDERBytes, err := x509.MarshalPKCS8PrivateKey(privateKey)
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if err != nil {
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return nil, nil, fmt.Errorf("failed to marshal private key: %v", err)
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}
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keyPEMBytes, err := ConvertDERToPEM(keyDERBytes, PrivateKey)
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if err != nil {
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return nil, nil, fmt.Errorf("faile to convert certificate in DER format into PEM: %v", err)
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}
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return certPEMBytes, keyPEMBytes, nil
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}
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// ConvertDERToPEM convert certificate in DER format into PEM format.
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func ConvertDERToPEM(der []byte, blockType PEMBlockType) ([]byte, error) {
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var buf bytes.Buffer
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var blockTypeStr string
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switch blockType {
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case Certificate:
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blockTypeStr = "CERTIFICATE"
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case PrivateKey:
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blockTypeStr = "PRIVATE KEY"
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default:
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return nil, fmt.Errorf("unknown PEM block type %d", blockType)
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}
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if err := pem.Encode(&buf, &pem.Block{Type: blockTypeStr, Bytes: der}); err != nil {
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return nil, fmt.Errorf("failed to encode DER data into PEM: %v", err)
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}
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return buf.Bytes(), nil
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}
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func publicKey(privateKey any) any {
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switch k := privateKey.(type) {
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case *rsa.PrivateKey:
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return &k.PublicKey
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case *ecdsa.PrivateKey:
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return &k.PublicKey
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case ed25519.PrivateKey:
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return k.Public().(ed25519.PublicKey)
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default:
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return nil
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}
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}
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// PrivateKeyBuilder interface for a private key builder.
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type PrivateKeyBuilder interface {
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Build() (any, error)
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}
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// RSAKeyBuilder builder of RSA private key.
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type RSAKeyBuilder struct {
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keySizeInBits int
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}
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// WithKeySize configure the key size to use with RSA.
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func (rkb RSAKeyBuilder) WithKeySize(bits int) RSAKeyBuilder {
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rkb.keySizeInBits = bits
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return rkb
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}
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// Build a RSA private key.
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func (rkb RSAKeyBuilder) Build() (any, error) {
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return rsa.GenerateKey(rand.Reader, rkb.keySizeInBits)
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}
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// Ed25519KeyBuilder builder of Ed25519 private key.
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type Ed25519KeyBuilder struct{}
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// Build an Ed25519 private key.
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func (ekb Ed25519KeyBuilder) Build() (any, error) {
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_, priv, err := ed25519.GenerateKey(rand.Reader)
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return priv, err
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}
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// ECDSAKeyBuilder builder of ECDSA private key.
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type ECDSAKeyBuilder struct {
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curve elliptic.Curve
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}
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// WithCurve configure the curve to use for the ECDSA private key.
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func (ekb ECDSAKeyBuilder) WithCurve(curve elliptic.Curve) ECDSAKeyBuilder {
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ekb.curve = curve
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return ekb
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}
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// Build an ECDSA private key.
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func (ekb ECDSAKeyBuilder) Build() (any, error) {
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return ecdsa.GenerateKey(ekb.curve, rand.Reader)
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}
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// ParseX509FromPEM parses PEM bytes and returns a PKCS key.
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func ParseX509FromPEM(data []byte) (key any, err error) {
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block, _ := pem.Decode(data)
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if block == nil {
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return nil, errors.New("failed to parse PEM block containing the key")
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}
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switch block.Type {
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case BlockTypeRSAPrivateKey:
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key, err = x509.ParsePKCS1PrivateKey(block.Bytes)
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case BlockTypeECDSAPrivateKey:
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key, err = x509.ParseECPrivateKey(block.Bytes)
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case BlockTypePKCS8PrivateKey:
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key, err = x509.ParsePKCS8PrivateKey(block.Bytes)
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case BlockTypeRSAPublicKey:
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key, err = x509.ParsePKCS1PublicKey(block.Bytes)
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case BlockTypePKIXPublicKey:
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key, err = x509.ParsePKIXPublicKey(block.Bytes)
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case BlockTypeCertificate:
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key, err = x509.ParseCertificate(block.Bytes)
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default:
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return nil, fmt.Errorf("unknown block type: %s", block.Type)
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}
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if err != nil {
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return nil, err
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}
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return key, nil
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}
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// CastX509AsCertificate converts an interface to an *x509.Certificate.
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func CastX509AsCertificate(c any) (certificate *x509.Certificate, ok bool) {
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switch t := c.(type) {
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case x509.Certificate:
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return &t, true
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case *x509.Certificate:
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return t, true
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default:
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return nil, false
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}
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}
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// IsX509PrivateKey returns true if the provided interface is an rsa.PrivateKey, ecdsa.PrivateKey, or ed25519.PrivateKey.
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func IsX509PrivateKey(i any) bool {
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switch i.(type) {
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case rsa.PrivateKey, *rsa.PrivateKey, ecdsa.PrivateKey, *ecdsa.PrivateKey, ed25519.PrivateKey, *ed25519.PrivateKey:
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return true
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default:
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return false
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}
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}
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// NewTLSConfig generates a tls.Config from a schema.TLSConfig and a x509.CertPool.
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func NewTLSConfig(config *schema.TLSConfig, certPool *x509.CertPool) (tlsConfig *tls.Config) {
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var certificates []tls.Certificate
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if config.CertificateChain.HasCertificates() && config.PrivateKey != nil {
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certificates = []tls.Certificate{
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{
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Certificate: config.CertificateChain.CertificatesRaw(),
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Leaf: config.CertificateChain.Leaf(),
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PrivateKey: config.PrivateKey,
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},
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}
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}
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return &tls.Config{
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ServerName: config.ServerName,
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InsecureSkipVerify: config.SkipVerify, //nolint:gosec // Informed choice by user. Off by default.
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MinVersion: config.MinimumVersion.MinVersion(),
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MaxVersion: config.MinimumVersion.MaxVersion(),
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RootCAs: certPool,
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Certificates: certificates,
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}
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}
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// NewX509CertPool generates a x509.CertPool from the system PKI and the directory specified.
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func NewX509CertPool(directory string) (certPool *x509.CertPool, warnings []error, errors []error) {
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certPool, err := x509.SystemCertPool()
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if err != nil {
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warnings = append(warnings, fmt.Errorf("could not load system certificate pool which may result in untrusted certificate issues: %v", err))
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certPool = x509.NewCertPool()
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}
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logger := logging.Logger()
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logger.Tracef("Starting scan of directory %s for certificates", directory)
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if directory != "" {
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certsFileInfo, err := os.ReadDir(directory)
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if err != nil {
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errors = append(errors, fmt.Errorf("could not read certificates from directory %v", err))
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} else {
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for _, certFileInfo := range certsFileInfo {
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nameLower := strings.ToLower(certFileInfo.Name())
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if !certFileInfo.IsDir() && (strings.HasSuffix(nameLower, ".cer") || strings.HasSuffix(nameLower, ".crt") || strings.HasSuffix(nameLower, ".pem")) {
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certPath := filepath.Join(directory, certFileInfo.Name())
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logger.Tracef("Found possible cert %s, attempting to add it to the pool", certPath)
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certBytes, err := os.ReadFile(certPath)
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if err != nil {
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errors = append(errors, fmt.Errorf("could not read certificate %v", err))
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} else if ok := certPool.AppendCertsFromPEM(certBytes); !ok {
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errors = append(errors, fmt.Errorf("could not import certificate %s", certFileInfo.Name()))
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}
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}
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}
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}
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}
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logger.Tracef("Finished scan of directory %s for certificates", directory)
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return certPool, warnings, errors
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}
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// WriteCertificateBytesToPEM writes a certificate/csr to a file in the PEM format.
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func WriteCertificateBytesToPEM(cert []byte, path string, csr bool) (err error) {
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out, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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return fmt.Errorf("failed to open %s for writing: %w", path, err)
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}
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blockType := BlockTypeCertificate
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if csr {
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blockType = BlockTypeCertificateRequest
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}
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if err = pem.Encode(out, &pem.Block{Bytes: cert, Type: blockType}); err != nil {
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_ = out.Close()
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return err
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}
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return out.Close()
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}
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// WriteKeyToPEM writes a key that can be encoded as a PEM to a file in the PEM format.
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func WriteKeyToPEM(key any, path string, pkcs8 bool) (err error) {
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pemBlock, err := PEMBlockFromX509Key(key, pkcs8)
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if err != nil {
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return err
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}
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out, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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return fmt.Errorf("failed to open %s for writing: %w", path, err)
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}
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if err = pem.Encode(out, pemBlock); err != nil {
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_ = out.Close()
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return err
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}
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return out.Close()
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}
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// PEMBlockFromX509Key turns a PublicKey or PrivateKey into a pem.Block.
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func PEMBlockFromX509Key(key any, pkcs8 bool) (pemBlock *pem.Block, err error) {
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var (
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data []byte
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blockType string
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)
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switch k := key.(type) {
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case *rsa.PrivateKey:
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if pkcs8 {
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blockType = BlockTypePKCS8PrivateKey
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data, err = x509.MarshalPKCS8PrivateKey(key)
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break
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}
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blockType = BlockTypeRSAPrivateKey
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data = x509.MarshalPKCS1PrivateKey(k)
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case *ecdsa.PrivateKey:
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if pkcs8 {
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blockType = BlockTypePKCS8PrivateKey
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data, err = x509.MarshalPKCS8PrivateKey(key)
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break
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}
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blockType = BlockTypeECDSAPrivateKey
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data, err = x509.MarshalECPrivateKey(k)
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case ed25519.PrivateKey:
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blockType = BlockTypePKCS8PrivateKey
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data, err = x509.MarshalPKCS8PrivateKey(k)
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case *rsa.PublicKey:
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if pkcs8 {
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blockType = BlockTypePKIXPublicKey
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data, err = x509.MarshalPKIXPublicKey(key)
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break
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}
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blockType = BlockTypeRSAPublicKey
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data = x509.MarshalPKCS1PublicKey(k)
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case *ecdsa.PublicKey, ed25519.PublicKey:
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blockType = BlockTypePKIXPublicKey
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data, err = x509.MarshalPKIXPublicKey(k)
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default:
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err = fmt.Errorf("failed to match key type: %T", k)
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}
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if err != nil {
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return nil, fmt.Errorf("failed to marshal key: %w", err)
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}
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return &pem.Block{
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Type: blockType,
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Bytes: data,
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}, nil
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}
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// KeySigAlgorithmFromString returns a x509.PublicKeyAlgorithm and x509.SignatureAlgorithm given a keyAlgorithm and signatureAlgorithm string.
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func KeySigAlgorithmFromString(keyAlgorithm, signatureAlgorithm string) (keyAlg x509.PublicKeyAlgorithm, sigAlg x509.SignatureAlgorithm) {
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keyAlg = PublicKeyAlgorithmFromString(keyAlgorithm)
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if keyAlg == x509.UnknownPublicKeyAlgorithm {
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return x509.UnknownPublicKeyAlgorithm, x509.UnknownSignatureAlgorithm
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}
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switch keyAlg {
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case x509.RSA:
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return keyAlg, RSASignatureAlgorithmFromString(signatureAlgorithm)
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case x509.ECDSA:
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return keyAlg, ECDSASignatureAlgorithmFromString(signatureAlgorithm)
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case x509.Ed25519:
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return keyAlg, x509.PureEd25519
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default:
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return keyAlg, x509.UnknownSignatureAlgorithm
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}
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}
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// PublicKeyAlgorithmFromString returns a x509.PublicKeyAlgorithm given an appropriate string.
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func PublicKeyAlgorithmFromString(algorithm string) (alg x509.PublicKeyAlgorithm) {
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switch strings.ToUpper(algorithm) {
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case KeyAlgorithmRSA:
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return x509.RSA
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case KeyAlgorithmECDSA:
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return x509.ECDSA
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case KeyAlgorithmEd25519:
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return x509.Ed25519
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default:
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return x509.UnknownPublicKeyAlgorithm
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}
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}
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// RSASignatureAlgorithmFromString returns a x509.SignatureAlgorithm for the RSA x509.PublicKeyAlgorithm given an
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// algorithm string.
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func RSASignatureAlgorithmFromString(algorithm string) (alg x509.SignatureAlgorithm) {
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switch strings.ToUpper(algorithm) {
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case HashAlgorithmSHA1:
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return x509.SHA1WithRSA
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case HashAlgorithmSHA256:
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return x509.SHA256WithRSA
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case HashAlgorithmSHA384:
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return x509.SHA384WithRSA
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case HashAlgorithmSHA512:
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return x509.SHA512WithRSA
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default:
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return x509.UnknownSignatureAlgorithm
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}
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}
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// ECDSASignatureAlgorithmFromString returns a x509.SignatureAlgorithm for the ECDSA x509.PublicKeyAlgorithm given an
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// algorithm string.
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func ECDSASignatureAlgorithmFromString(algorithm string) (alg x509.SignatureAlgorithm) {
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switch strings.ToUpper(algorithm) {
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case HashAlgorithmSHA1:
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return x509.ECDSAWithSHA1
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case HashAlgorithmSHA256:
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return x509.ECDSAWithSHA256
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case HashAlgorithmSHA384:
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return x509.ECDSAWithSHA384
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case HashAlgorithmSHA512:
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return x509.ECDSAWithSHA512
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default:
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return x509.UnknownSignatureAlgorithm
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}
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}
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// EllipticCurveFromString turns a string into an elliptic.Curve.
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func EllipticCurveFromString(curveString string) (curve elliptic.Curve) {
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switch strings.ToUpper(curveString) {
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case EllipticCurveAltP224, EllipticCurveP224:
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return elliptic.P224()
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case EllipticCurveAltP256, EllipticCurveP256:
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return elliptic.P256()
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case EllipticCurveAltP384, EllipticCurveP384:
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return elliptic.P384()
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case EllipticCurveAltP521, EllipticCurveP521:
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return elliptic.P521()
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default:
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return nil
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}
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}
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// PublicKeyFromPrivateKey returns a PublicKey when provided with a PrivateKey.
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func PublicKeyFromPrivateKey(privateKey any) (publicKey any) {
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switch k := privateKey.(type) {
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case *rsa.PrivateKey:
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return &k.PublicKey
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case *ecdsa.PrivateKey:
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return &k.PublicKey
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case ed25519.PrivateKey:
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return k.Public().(ed25519.PublicKey)
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default:
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return nil
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}
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}
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// X509ParseKeyUsage parses a list of key usages. If provided with an empty list returns a default of Key Encipherment
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// and Digital Signature unless ca is true in which case it returns Cert Sign.
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func X509ParseKeyUsage(keyUsages []string, ca bool) (keyUsage x509.KeyUsage) {
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if len(keyUsages) == 0 {
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keyUsage = x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature
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if ca {
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keyUsage |= x509.KeyUsageCertSign
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}
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return keyUsage
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}
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for _, keyUsageString := range keyUsages {
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switch strings.ToLower(keyUsageString) {
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case "digitalsignature", "digital_signature":
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keyUsage |= x509.KeyUsageDigitalSignature
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case "keyencipherment", "key_encipherment":
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keyUsage |= x509.KeyUsageKeyEncipherment
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case "dataencipherment", "data_encipherment":
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keyUsage |= x509.KeyUsageDataEncipherment
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case "keyagreement", "key_agreement":
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keyUsage |= x509.KeyUsageKeyAgreement
|
|
case "certsign", "cert_sign", "certificatesign", "certificate_sign":
|
|
keyUsage |= x509.KeyUsageCertSign
|
|
case "crlsign", "crl_sign":
|
|
keyUsage |= x509.KeyUsageCRLSign
|
|
case "encipheronly", "encipher_only":
|
|
keyUsage |= x509.KeyUsageEncipherOnly
|
|
case "decipheronly", "decipher_only":
|
|
keyUsage |= x509.KeyUsageDecipherOnly
|
|
}
|
|
}
|
|
|
|
return keyUsage
|
|
}
|
|
|
|
// X509ParseExtendedKeyUsage parses a list of extended key usages. If provided with an empty list returns a default of
|
|
// Server Auth unless ca is true in which case it returns a default of Any.
|
|
func X509ParseExtendedKeyUsage(extKeyUsages []string, ca bool) (extKeyUsage []x509.ExtKeyUsage) {
|
|
if len(extKeyUsages) == 0 {
|
|
if ca {
|
|
extKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageAny}
|
|
} else {
|
|
extKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth}
|
|
}
|
|
|
|
return extKeyUsage
|
|
}
|
|
|
|
loop:
|
|
for _, extKeyUsageString := range extKeyUsages {
|
|
switch strings.ToLower(extKeyUsageString) {
|
|
case "any":
|
|
extKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageAny}
|
|
break loop
|
|
case "serverauth", "server_auth":
|
|
extKeyUsage = append(extKeyUsage, x509.ExtKeyUsageServerAuth)
|
|
case "clientauth", "client_auth":
|
|
extKeyUsage = append(extKeyUsage, x509.ExtKeyUsageClientAuth)
|
|
case "codesigning", "code_signing":
|
|
extKeyUsage = append(extKeyUsage, x509.ExtKeyUsageCodeSigning)
|
|
case "emailprotection", "email_protection":
|
|
extKeyUsage = append(extKeyUsage, x509.ExtKeyUsageEmailProtection)
|
|
case "ipsecendsystem", "ipsec_endsystem", "ipsec_end_system":
|
|
extKeyUsage = append(extKeyUsage, x509.ExtKeyUsageIPSECEndSystem)
|
|
case "ipsectunnel", "ipsec_tunnel":
|
|
extKeyUsage = append(extKeyUsage, x509.ExtKeyUsageIPSECTunnel)
|
|
case "ipsecuser", "ipsec_user":
|
|
extKeyUsage = append(extKeyUsage, x509.ExtKeyUsageIPSECUser)
|
|
case "ocspsigning", "ocsp_signing":
|
|
extKeyUsage = append(extKeyUsage, x509.ExtKeyUsageOCSPSigning)
|
|
}
|
|
}
|
|
|
|
return extKeyUsage
|
|
}
|