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/*
* ZLint Copyright 2024 Regents of the University of Michigan
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy
* of the License at http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package util
import (
"github.com/zmap/zcrypto/x509"
)
// IsCACert returns true if c has IsCA set.
func IsCACert(c *x509.Certificate) bool {
return c.IsCA
}
// IsRootCA returns true if c has IsCA set and is also self-signed.
func IsRootCA(c *x509.Certificate) bool {
return IsCACert(c) && IsSelfSigned(c)
}
// IsSubCA returns true if c has IsCA set, but is not self-signed.
func IsSubCA(c *x509.Certificate) bool {
return IsCACert(c) && !IsSelfSigned(c)
}
// IsSelfSigned returns true if SelfSigned is set.
func IsSelfSigned(c *x509.Certificate) bool {
return c.SelfSigned
}
// IsSubscriberCert returns true for if a certificate is not a CA and not
// self-signed.
func IsSubscriberCert(c *x509.Certificate) bool {
return !IsCACert(c) && !IsSelfSigned(c)
}
// IsDelegatedOCSPResponderCert returns true if the id-kp-OCSPSigning EKU is set
// According https://tools.ietf.org/html/rfc6960#section-4.2.2.2 it is not sufficient
// to have only the id-kp-anyExtendedKeyUsage included
func IsDelegatedOCSPResponderCert(cert *x509.Certificate) bool {
return HasEKU(cert, x509.ExtKeyUsageOcspSigning)
}
func IsServerAuthCert(cert *x509.Certificate) bool {
if len(cert.ExtKeyUsage) == 0 {
return true
}
for _, eku := range cert.ExtKeyUsage {
if eku == x509.ExtKeyUsageAny || eku == x509.ExtKeyUsageServerAuth {
return true
}
}
return false
}
// IsEmailProtectionCert returns true if the certificate presented is for use protecting emails.
// A certificate is for use protecting emails if it contains the Any Purpose or emailProtection
// EKUs or if the certificate contains no EKUs. This last point is a way of being overly cautious
// and choosing to prefer false positives over false negatives.
func IsEmailProtectionCert(cert *x509.Certificate) bool {
if len(cert.ExtKeyUsage) == 0 {
return true
}
for _, eku := range cert.ExtKeyUsage {
if eku == x509.ExtKeyUsageAny || eku == x509.ExtKeyUsageEmailProtection {
return true
}
}
return false
}
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