RFR: 8369950: TLS connection to IPv6 address fails with BCJSSE due to IllegalArgumentException

[Jaikiran Pai]

On Mon, 1 Dec 2025 14:12:04 GMT, Sergey Chernyshev <schernyshev at openjdk.org> wrote:

> Hi all,
> 
> Let me propose a fix and a test case for JDK-8369950.
> 
> The failure reproduces with BCJSSE provider and all implementations of SSLSocket other than SSLSocketImpl.
> 
> In the test case an anonymous wrapper is used, over the standard SSLSocketImpl, to simulate an external JSSE provider. The test case shows the same behavior as in BCJSSE (failure due to non-LDH ASCII characters in the SNI host name).
> 
> The fix avoids constructing SNIHostName when the URL host name is an IPv4 or IPv6 literal address. Other than that, all other FQDN host names that have invalid characters (non-LDH ASCII characters) still produce that exception.
> 
> SNIHostName, as defined in
> https://github.com/openjdk/jdk/blob/873f8a696fa45c7d94a164be20cf3c797ce7f2a6/src/java.base/share/classes/javax/net/ssl/SNIHostName.java#L44-L66
> 
> has the fully qualified DNS hostname of the server. As follows from the section 3, "Server Name Indication", RFC 6066, `Literal IPv4 and IPv6 addresses are not permitted in "HostName"`.
> 
> The fix mirrors the behavior of SSLSocketImpl, that avoids constructing the SNIHostName from literal addresses. Please see
> 
> https://github.com/openjdk/jdk/blob/873f8a696fa45c7d94a164be20cf3c797ce7f2a6/src/java.base/share/classes/sun/security/ssl/Utilities.java#L110-L116
> 
> Testing:
> - standard jtreg tests goups showed no regressions
> - the new test passes with the fix and fails otherwise
> - passes also with BCJSSE in FIPS and standard mode 
> 
> <details><summary> BCJSSE standard</summary>
> 
> 
> STDOUT:
> STDERR:
> Dez. 01, 2025 2:44:02 PM org.bouncycastle.jsse.provider.PropertyUtils getBooleanSecurityProperty
> INFORMATION: Found boolean security property [keystore.type.compat]: true
> Dez. 01, 2025 2:44:02 PM org.bouncycastle.jsse.provider.PropertyUtils getStringSecurityProperty
> INFORMATION: Found string security property [jdk.tls.disabledAlgorithms]: SSLv3, TLSv1, TLSv1.1, DTLSv1.0, RC4, DES, MD5withRSA, DH keySize < 1024, EC keySize < 224, 3DES_EDE_CBC, anon, NULL, ECDH, TLS_RSA_*, rsa_pkcs1_sha1 usage HandshakeSignature, ecdsa_sha1 usage HandshakeSignature, dsa_sha1 usage HandshakeSignature
> Dez. 01, 2025 2:44:02 PM org.bouncycastle.jsse.provider.DisabledAlgorithmConstraints create
> WARNUNG: Ignoring unsupported entry in 'jdk.tls.disabledAlgorithms': rsa_pkcs1_sha1 usage HandshakeSignature
> Dez. 01, 2025 2:44:02 PM org.bouncycastle.jsse.provider.DisabledAlgorithmConstraints create
> WARNUNG: Ignoring unsupported entry in 'jdk.tls.disabledAlgorithms': ecdsa_sha1 usage HandshakeSignature
> Dez. 01, 2025 2...

test/jdk/javax/net/ssl/HttpsURLConnection/SubjectAltNameIPv6.java line 28:

> 26:  * @bug 8369950
> 27:  * @library /test/lib
> 28:  * @summary TLS connection to IPv6 address fails with BCJSSE due to IllegalArgumentException

Nit - as per the jtreg tag order recommendation, the `@summary` should come before the `@library` https://openjdk.org/jtreg/tag-spec.html#ORDER

test/jdk/javax/net/ssl/HttpsURLConnection/SubjectAltNameIPv6.java line 71:

> 69:      * currently 3 minutes by default, but you might try to be
> 70:      * smart about it....
> 71:      */

I am not too familiar with these style of tests, but it looks like there are several similar ones in the `javax/net/ssl` area. Would you know if these comments are still accurate and up to date? In other words, do we need these comments in this test?

test/jdk/javax/net/ssl/HttpsURLConnection/SubjectAltNameIPv6.java line 97:

> 95:         bw.write("HTTP/1.1 200 OK\r\n\r\n\r\n");
> 96:         bw.flush();
> 97:         Thread.sleep(5000);

Is the sleep() necessary for this test?

test/jdk/javax/net/ssl/HttpsURLConnection/SubjectAltNameIPv6.java line 165:

> 163:      */
> 164:     SubjectAltNameIPv6() throws Exception {
> 165:         if (separateServerThread) {

Are these if/else blocks needed or could we simplify the test to just expect the server and client to run as separate threads?

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/28577#discussion_r2580413566
PR Review Comment: https://git.openjdk.org/jdk/pull/28577#discussion_r2580386092
PR Review Comment: https://git.openjdk.org/jdk/pull/28577#discussion_r2580387059
PR Review Comment: https://git.openjdk.org/jdk/pull/28577#discussion_r2580393762