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64 lines
2.0 KiB
Go
64 lines
2.0 KiB
Go
package ca
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import (
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"bytes"
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"crypto/sha256"
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"crypto/x509"
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"encoding/hex"
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"fmt"
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"strings"
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"time"
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)
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// NewFingerprintVerifier returns a function that verifies whether a certificate's SHA-256 fingerprint matches the given one.
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func NewFingerprintVerifier(fingerprint string, time func() time.Time) (func(certs []*x509.Certificate, serverName string) error, error) {
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switch fingerprint {
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case "chrome", "firefox", "safari", "ios", "android", "edge", "360", "qq", "random", "randomized": // WTF???
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return nil, fmt.Errorf("`fingerprint` is used for TLS certificate pinning. If you need to specify the browser fingerprint, use `client-fingerprint`")
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}
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fingerprint = strings.TrimSpace(strings.Replace(fingerprint, ":", "", -1))
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fpByte, err := hex.DecodeString(fingerprint)
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if err != nil {
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return nil, fmt.Errorf("fingerprint string decode error: %w", err)
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}
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if len(fpByte) != 32 {
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return nil, fmt.Errorf("fingerprint string length error,need sha256 fingerprint")
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}
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return func(certs []*x509.Certificate, serverName string) error {
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// ssl pining
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for i, cert := range certs {
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hash := sha256.Sum256(cert.Raw)
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if bytes.Equal(fpByte, hash[:]) {
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if i > 0 {
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// When the fingerprint matches a non-leaf certificate,
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// the certificate chain validity is verified using the certificate as the trusted root certificate.
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opts := x509.VerifyOptions{
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Roots: x509.NewCertPool(),
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Intermediates: x509.NewCertPool(),
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DNSName: serverName,
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}
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if time != nil {
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opts.CurrentTime = time()
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}
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opts.Roots.AddCert(certs[i])
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for _, cert := range certs[1 : i+1] { // stop at i
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opts.Intermediates.AddCert(cert)
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}
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_, err := certs[0].Verify(opts)
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return err
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}
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return nil
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}
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}
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return errNotMatch
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}, nil
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}
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// CalculateFingerprint computes the SHA-256 fingerprint of the given DER-encoded certificate and returns it as a hex string.
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func CalculateFingerprint(certDER []byte) string {
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hash := sha256.Sum256(certDER)
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return hex.EncodeToString(hash[:])
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}
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