77 lines
1.8 KiB
Go
77 lines
1.8 KiB
Go
package credentials
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import (
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"crypto/tls"
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"encoding/pem"
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"errors"
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"fmt"
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"log"
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"os"
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"os/exec"
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"strings"
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"google.golang.org/grpc/credentials"
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)
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func CredentialsFromKeyWithPasswd(certFile, certKey, passwd string) (credentials.TransportCredentials, error) {
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if certFile == "" {
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return nil, errors.New("certFile cannot be empty")
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}
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if certKey == "" {
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return nil, errors.New("certKey cannot be empty")
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}
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bts, err := os.ReadFile(certKey)
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if err != nil {
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return nil, fmt.Errorf("os.ReadFile certKey: %s", err)
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}
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keyBlock, rest := pem.Decode(bts)
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if keyBlock == nil {
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return nil, errors.New("not valid pem file")
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}
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if len(rest) > 0 {
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return nil, errors.New("rest is not empty")
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}
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if !strings.Contains(keyBlock.Type, "ENCRYPTED") {
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return nil, fmt.Errorf("certificate should has been encrypted with password")
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}
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decriptedKeyPem, err := decryptRSA(certKey, passwd)
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if err != nil {
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return nil, fmt.Errorf("decryptRSA: %s", err)
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}
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bts, err = os.ReadFile(certFile)
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if err != nil {
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return nil, fmt.Errorf("os.ReadFile certFile: %s", err)
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}
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cert, err := tls.X509KeyPair(bts, []byte(decriptedKeyPem))
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if err != nil {
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return nil, fmt.Errorf("tls.X509KeyPair: %s", err)
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}
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log.Println("cert loaded successfuly")
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return credentials.NewServerTLSFromCert(&cert), nil
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}
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func decryptRSA(keyFile, password string) (string, error) {
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// openssl rsa -passin pass:test -in passwd.pem -out passwd.enc.key
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cmd := exec.Command("openssl", "rsa", "-in", keyFile, "-passin", formatPass(password), "-text")
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output_bts, err := cmd.Output()
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if err != nil {
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return "", fmt.Errorf("cmd.Output: %s", err)
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}
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idx := strings.Index(string(output_bts), "-----BEGIN")
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return string(output_bts)[idx:], nil
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}
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func formatPass(password string) string {
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if password == "" {
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return ""
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}
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return "pass:" + password
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}
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