FliegenKLATSCH commented on a change in pull request #119: Add support for
openssh host key certificates
URL: https://github.com/apache/mina-sshd/pull/119#discussion_r409752593
##########
File path: sshd-core/src/main/java/org/apache/sshd/client/kex/DHGClient.java
##########
@@ -154,4 +168,54 @@ public boolean next(int cmd, Buffer buffer) throws
Exception {
return true;
}
+
+ protected void verifyCertificate(Session session, OpenSshCertificate
openSshKey) throws Exception {
+ PublicKey signatureKey = openSshKey.getCaPubKey();
+ String keyAlg = KeyUtils.getKeyType(signatureKey);
+ Signature verif = ValidateUtils.checkNotNull(
+ NamedFactory.create(session.getSignatureFactories(), keyAlg),
+ "No verifier located for algorithm=%s", keyAlg);
+ verif.initVerifier(session, signatureKey);
+ verif.update(session, openSshKey.getMessage());
+ if (!verif.verify(session, openSshKey.getSignature())) {
+ throw new
SshException(SshConstants.SSH2_DISCONNECT_KEY_EXCHANGE_FAILED,
+ "KeyExchange CA signature verification failed for key
type=" + keyAlg);
+ }
+
+ if (openSshKey.getType() != OpenSshCertificate.SSH_CERT_TYPE_HOST) {
+ throw new
SshException(SshConstants.SSH2_DISCONNECT_KEY_EXCHANGE_FAILED,
+ "KeyExchange signature verification failed, not a host key
(2): "
+ + openSshKey.getType());
+ }
+
+ long now = System.currentTimeMillis() / 1000;
+ if (now <= openSshKey.getValidAfter() || now >=
openSshKey.getValidBefore()) {
Review comment:
>A certificate is considered valid if:
The <= should be a strict <, but with the negation it should be correct
besides this.
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