vukzeka commented on code in PR #222:
URL: https://github.com/apache/mina-sshd/pull/222#discussion_r870194796
##########
sshd-core/src/main/java/org/apache/sshd/certificate/OpenSshCertificateBuilder.java:
##########
@@ -104,7 +110,21 @@ public OpenSshCertificateBuilder
principals(Collection<String> principals) {
}
public OpenSshCertificateBuilder
criticalOptions(List<OpenSshCertificate.CertificateOption> criticalOptions) {
- this.criticalOptions = criticalOptions;
+ if (criticalOptions != null && !criticalOptions.isEmpty()) {
+ // check if any duplicates
+ Set<String> names = new HashSet<String>();
+ Set<String> duplicates = criticalOptions.stream().filter(option ->
!names.add(option.getName()))
+ .map(option -> option.getName())
+ .collect(Collectors.toSet());
+ if (!duplicates.isEmpty()) {
+ throw new IllegalArgumentException("Duplicate critical option:
" + String.join(",", duplicates));
+ }
+ // lexically order by "name"
+ List<OpenSshCertificate.CertificateOption> sortedCriticalOptions =
criticalOptions.stream()
+
.sorted(Comparator.comparing(OpenSshCertificate.CertificateOption::getName))
+ .collect(Collectors.toList());
+ this.criticalOptions = sortedCriticalOptions;
+ }
Review Comment:
@tomaswolf I was not aware that duplicate and sorting are applied for
extensions.
I just checked with ssh-keygen and is possible to add custom extensions and
these are not sorted and also duplicates are allowed
for example following
```
ssh-keygen -s user_ca -I certN -n user -O extension:test=value -O
extension:test=value -O extension:[email protected]=value -O
extension:[email protected]=value -O critical:b_critical_option=value -O
critical:a_critical_option=value -V +10d user-key.pub
```
would generate
```Type: [email protected] user certificate
Public key: RSA-CERT
SHA256:c6uq2hsYBCROmuFrWz38sIk+0Hlx75l5kOqRo7J1wv8
Signing CA: RSA SHA256:qBnc5EM9d1dlZSfbtnPBh45cAJt5jM7LcLeGDbFOd38
(using rsa-sha2-512)
Key ID: "certN"
Serial: 0
Valid: from 2022-05-11T13:24:00 to 2022-05-21T13:25:15
Principals:
user
Critical Options: (none)
Extensions:
permit-X11-forwarding
permit-agent-forwarding
permit-port-forwarding
permit-pty
permit-user-rc
test UNKNOWN OPTION (len 9)
test UNKNOWN OPTION (len 9)
[email protected] UNKNOWN OPTION (len 9)
[email protected] UNKNOWN OPTION (len 9)
```
So it looks to me
- duplicates are checked only for standard extensions
- ordering is applied only for standard extensions
- all custom extensions are added in the order as specified and custom
duplicates are allowed
@tomaswolf I can add like that if that sounds correct?
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