Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
We'll validate user provided certificates, checking fields such as: * Common Name * Organization * NotBefore, NotAfter * DNS Subject Alternative Name Also, we ensure that the certificates are signed by the specified CAs.
- Loading branch information
1 parent
8d20f34
commit f514e7f
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| package pkiutil | ||
|
|
||
| import ( | ||
| "crypto/x509" | ||
| "fmt" | ||
| "slices" | ||
| "time" | ||
| ) | ||
|
|
||
| // CertCheck can be used to validate certificates. Unspecified fields are | ||
| // ignored. "NotBefore" and "NotAfter" are checked implicitly. | ||
| type CertCheck struct { | ||
| // Ensure that the certificate has the specified Common Name. | ||
| CN string | ||
| // Ensure that the certificate contains the following organizations. | ||
| O []string | ||
| // Ensure that the certificate contains the following DNS SANs. | ||
| DNSSANs []string | ||
| // Ensure that the certificate contains the following IP SANs. | ||
| IPSANs []string | ||
| // Validate the certificate against the specified CA certificate. | ||
| CaPEM string | ||
| AllowSelfSigned bool | ||
| } | ||
|
|
||
| func (check CertCheck) ValidateKeypair(certPEM string, keyPEM string) error { | ||
| cert, _, err := LoadCertificate(certPEM, keyPEM) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to parse certificate: %w", err) | ||
| } | ||
|
|
||
| return check.ValidateCert(cert) | ||
| } | ||
|
|
||
| func (check CertCheck) ValidateCert(cert *x509.Certificate) error { | ||
| if check.CN != "" && check.CN != cert.Subject.CommonName { | ||
| return fmt.Errorf("invalid certificate CN, expected: %s, actual: %s ", | ||
| check.CN, cert.Subject.CommonName) | ||
| } | ||
| for _, checkO := range check.O { | ||
| if !slices.Contains(cert.Subject.Organization, checkO) { | ||
| return fmt.Errorf("missing cert organization: %s, actual: %v", | ||
| checkO, cert.Subject.Organization) | ||
| } | ||
| } | ||
|
|
||
| now := time.Now() | ||
| if now.Before(cert.NotBefore) { | ||
| return fmt.Errorf("invalid certificate, not valid before: %v, current time: %v", | ||
| cert.NotBefore, now) | ||
| } | ||
| if now.After(cert.NotAfter) { | ||
| return fmt.Errorf("certificate expired since: %v, current time: %v", | ||
| cert.NotAfter, now) | ||
| } | ||
|
|
||
| if !check.AllowSelfSigned { | ||
| verifyOpts := x509.VerifyOptions{} | ||
| if check.CaPEM != "" { | ||
| roots := x509.NewCertPool() | ||
| if !roots.AppendCertsFromPEM([]byte(check.CaPEM)) { | ||
| return fmt.Errorf("invalid CA certificate") | ||
| } | ||
| verifyOpts.Roots = roots | ||
| } | ||
|
|
||
| if _, err := cert.Verify(verifyOpts); err != nil { | ||
| return fmt.Errorf("certificate validation failure: %w", err) | ||
| } | ||
| } | ||
|
|
||
| for _, dnsName := range check.DNSSANs { | ||
| if err := cert.VerifyHostname(dnsName); err != nil { | ||
| return fmt.Errorf("certificate dns name (%s) validation failure: %w, allowed dns names: %v", | ||
| dnsName, err, cert.DNSNames) | ||
| } | ||
| } | ||
| for _, ip := range check.IPSANs { | ||
| if err := cert.VerifyHostname("[" + ip + "]"); err != nil { | ||
| return fmt.Errorf("certificate ip (%s) validation failure: %w, allowed IPs: %v", | ||
| ip, err, cert.IPAddresses) | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } |