RFR [14] JDK-8226374 Restrict signature algorithms and named groups

Sean Mullan sean.mullan at oracle.com
Wed Jul 10 15:29:50 UTC 2019

I think we should modify the description of the 
jdk.tls.disabledAlgorithms property to state that named groups can also 
be restricted. For example:

diff -r a7b9d6d4940e src/java.base/share/conf/security/java.security
--- a/src/java.base/share/conf/security/java.security   Thu Jun 20 
09:35:41 2019 -0700
+++ b/src/java.base/share/conf/security/java.security   Wed Jul 10 
11:21:32 2019 -0400
@@ -678,7 +678,7 @@
  # when using SSL/TLS/DTLS.  This section describes the mechanism for 
  # algorithms during SSL/TLS/DTLS security parameters negotiation, 
  # protocol version negotiation, cipher suites selection, peer 
-# and key exchange mechanisms.
+# and key exchange mechanisms, and named groups.
  # Disabled algorithms will not be negotiated for SSL/TLS connections, even
  # if they are enabled explicitly in an application.

This should also be in the CSR.

Also, in the CSR you list all the different signature algorithms that 
could be disabled, but you use the TLS names, and not the standard JCE 
names. I found this a bit confusing, since if you added those exact TLS 
names to jdk.tls.disabledAlgorithms, I don't think it will work, or if 
it does we need additional changes to the jdk.tls.disabledAlgorithms 
definition - and maybe that is what we should do?  Also, I don't think 
it is possible to disable individual RSASSA-PSS algorithms, I think you 
can just disable all or none of them because the parameters are 
specified separately and not part of the standard JCE name. Similar to 
other algorithms - how would I just disable ecdsa_secp256r1_sha256 and 
nothing else? Is that an issue?


On 7/9/19 12:43 PM, Xuelei Fan wrote:
> Hi,
> Could I get the following update reviewed?
> webrev: http://cr.openjdk.java.net/~xuelei/8226374/webrev.01/
> CSR:    https://bugs.openjdk.java.net/browse/JDK-8227445
> During handshaking, the selection of signature algorithms was not 
> checked with the algorithm constraints.  Then the available signature 
> algorithms may be ignored if a restricted algorithm get selected.  The 
> connection should be able to be established as there are available 
> algorithms.
> Within this update, more algorithm constraints checking are introduced 
> in the signature algorithms and named groups code.
> The significant changes are in NamedGroup.java and SignatureScheme.java, 
> in order to introduce the checking and algorithm parameters and specs.
> Note that the following JDK 13 review thread was close out.
> https://mail.openjdk.java.net/pipermail/security-dev/2019-July/020348.html
> I targeted this enhancement to JDK 14, and come up with a CSR request.
> Thanks,
> Xuelei

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