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Drop TLS_RSA ciphers from default cipher suites for JDK 24 (elastic#123600) (elastic#123988)
This PR adjusts the list of supported ciphers to reflect ciphers available in JDK 24. JDK 24 [drops](https://bugs.openjdk.org/browse/JDK-8245545) support for `TLS_RSA` suites. These ciphers will no longer be supported in Elasticsearch with a bundled JDK with version >= 24. JDK's of lower versions will continue to support to dropped ciphers. I will follow up this PR with a separate docs PR.
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‎docs/changelog/123600.yaml‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,17 @@
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pr: 123600
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summary: Drop `TLS_RSA` cipher support for JDK 24
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area: TLS
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type: breaking
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issues: []
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breaking:
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title: Drop `TLS_RSA` cipher support for JDK 24
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area: Cluster and node setting
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details: >-
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This change removes `TLS_RSA` ciphers from the list of default supported ciphers,
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for Elasticsearch deployments running on JDK 24.
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impact: >-
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The dropped ciphers are `TLS_RSA_WITH_AES_256_GCM_SHA384`, `TLS_RSA_WITH_AES_128_GCM_SHA256`,
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`TLS_RSA_WITH_AES_256_CBC_SHA256`, `TLS_RSA_WITH_AES_128_CBC_SHA256`, `TLS_RSA_WITH_AES_256_CBC_SHA`,
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and `TLS_RSA_WITH_AES_128_CBC_SHA`. TLS connections to Elasticsearch using these ciphers will no longer work.
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Please configure your clients to use one of supported cipher suites.
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notable: false

‎libs/ssl-config/src/main/java/org/elasticsearch/common/ssl/SslConfigurationLoader.java‎

Lines changed: 39 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -62,7 +62,7 @@ public abstract class SslConfigurationLoader {
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static final List<String> DEFAULT_PROTOCOLS = List.of("TLSv1.3", "TLSv1.2");
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65-
private static final List<String> JDK12_CIPHERS = List.of(
65+
private static final List<String> PRE_JDK24_CIPHERS = List.of(
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// TLSv1.3 cipher has PFS, AEAD, hardware support
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"TLS_AES_256_GCM_SHA384",
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"TLS_AES_128_GCM_SHA256",
@@ -111,7 +111,44 @@ public abstract class SslConfigurationLoader {
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"TLS_RSA_WITH_AES_128_CBC_SHA"
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);
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114-
static final List<String> DEFAULT_CIPHERS = JDK12_CIPHERS;
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private static final List<String> JDK24_CIPHERS = List.of(
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// TLSv1.3 cipher has PFS, AEAD, hardware support
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"TLS_AES_256_GCM_SHA384",
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"TLS_AES_128_GCM_SHA256",
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// TLSv1.3 cipher has PFS, AEAD
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"TLS_CHACHA20_POLY1305_SHA256",
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// PFS, AEAD, hardware support
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"TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
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"TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
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// PFS, AEAD, hardware support
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"TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
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"TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
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// PFS, AEAD
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"TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256",
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"TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256",
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// PFS, hardware support
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"TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384",
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"TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256",
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// PFS, hardware support
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"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384",
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"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256",
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// PFS, hardware support
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"TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA",
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"TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA",
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// PFS, hardware support
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"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA",
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"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA"
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);
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static final List<String> DEFAULT_CIPHERS = Runtime.version().feature() < 24 ? PRE_JDK24_CIPHERS : JDK24_CIPHERS;
115152
private static final char[] EMPTY_PASSWORD = new char[0];
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public static final List<X509Field> GLOBAL_DEFAULT_RESTRICTED_TRUST_FIELDS = List.of(X509Field.SAN_OTHERNAME_COMMONNAME);
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‎x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/XPackSettings.java‎

Lines changed: 22 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -212,7 +212,7 @@ public Iterator<Setting<?>> settings() {
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Property.NodeScope
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);
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215-
private static final List<String> JDK12_CIPHERS = List.of(
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private static final List<String> PRE_JDK24_CIPHERS = List.of(
216216
"TLS_AES_256_GCM_SHA384",
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"TLS_AES_128_GCM_SHA256", // TLSv1.3 cipher has PFS, AEAD, hardware support
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"TLS_CHACHA20_POLY1305_SHA256", // TLSv1.3 cipher has PFS, AEAD
@@ -238,7 +238,27 @@ public Iterator<Setting<?>> settings() {
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"TLS_RSA_WITH_AES_128_CBC_SHA"
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); // hardware support
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241-
public static final List<String> DEFAULT_CIPHERS = JDK12_CIPHERS;
241+
private static final List<String> JDK24_CIPHERS = List.of(
242+
"TLS_AES_256_GCM_SHA384",
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"TLS_AES_128_GCM_SHA256", // TLSv1.3 cipher has PFS, AEAD, hardware support
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"TLS_CHACHA20_POLY1305_SHA256", // TLSv1.3 cipher has PFS, AEAD
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"TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
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"TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256", // PFS, AEAD, hardware support
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"TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
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"TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256", // PFS, AEAD, hardware support
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"TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256",
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"TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256", // PFS, AEAD
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"TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384",
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"TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256", // PFS, hardware support
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"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384",
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"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256", // PFS, hardware support
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"TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA",
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"TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA", // PFS, hardware support
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"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA",
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"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA" // PFS, hardware support
259+
); // hardware support
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public static final List<String> DEFAULT_CIPHERS = Runtime.version().feature() < 24 ? PRE_JDK24_CIPHERS : JDK24_CIPHERS;
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243263
public static final Setting<String> PASSWORD_HASHING_ALGORITHM = defaultStoredPasswordHashAlgorithmSetting(
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"xpack.security.authc.password_hashing.algorithm",

‎x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/XPackSettingsTests.java‎

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@@ -30,8 +30,22 @@
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public class XPackSettingsTests extends ESTestCase {
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public void testDefaultSSLCiphers() {
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assertThat(XPackSettings.DEFAULT_CIPHERS, hasItem("TLS_RSA_WITH_AES_128_CBC_SHA"));
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assertThat(XPackSettings.DEFAULT_CIPHERS, hasItem("TLS_RSA_WITH_AES_256_CBC_SHA"));
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assertThat(XPackSettings.DEFAULT_CIPHERS, hasItem("TLS_AES_256_GCM_SHA384"));
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assertThat(XPackSettings.DEFAULT_CIPHERS, hasItem("TLS_AES_128_GCM_SHA256"));
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assertThat(XPackSettings.DEFAULT_CIPHERS, hasItem("TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256"));
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assertThat(XPackSettings.DEFAULT_CIPHERS, hasItem("TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384"));
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38+
if (Runtime.version().feature() < 24) {
39+
assertThat(XPackSettings.DEFAULT_CIPHERS, hasItem("TLS_RSA_WITH_AES_256_CBC_SHA256"));
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assertThat(XPackSettings.DEFAULT_CIPHERS, hasItem("TLS_RSA_WITH_AES_128_CBC_SHA256"));
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assertThat(XPackSettings.DEFAULT_CIPHERS, hasItem("TLS_RSA_WITH_AES_256_CBC_SHA"));
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assertThat(XPackSettings.DEFAULT_CIPHERS, hasItem("TLS_RSA_WITH_AES_128_CBC_SHA"));
43+
} else {
44+
assertThat(XPackSettings.DEFAULT_CIPHERS, not(hasItem("TLS_RSA_WITH_AES_256_CBC_SHA256")));
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assertThat(XPackSettings.DEFAULT_CIPHERS, not(hasItem("TLS_RSA_WITH_AES_128_CBC_SHA256")));
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assertThat(XPackSettings.DEFAULT_CIPHERS, not(hasItem("TLS_RSA_WITH_AES_256_CBC_SHA")));
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assertThat(XPackSettings.DEFAULT_CIPHERS, not(hasItem("TLS_RSA_WITH_AES_128_CBC_SHA")));
48+
}
3549
}
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3751
public void testChaCha20InCiphersOnJdk12Plus() {

‎x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/ssl/SSLConfigurationSettingsTests.java‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -35,15 +35,15 @@ public void testParseCipherSettingsWithoutPrefix() {
3535
final Settings settings = Settings.builder()
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.put("cipher_suites.0", "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256")
3737
.put("cipher_suites.1", "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256")
38-
.put("cipher_suites.2", "TLS_RSA_WITH_AES_128_CBC_SHA256")
38+
.put("cipher_suites.2", Runtime.version().feature() < 24 ? "TLS_RSA_WITH_AES_128_CBC_SHA256" : "TLS_AES_256_GCM_SHA384")
3939
.build();
4040
assertThat(
4141
ssl.ciphers.get(settings),
4242
is(
4343
Arrays.asList(
4444
"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256",
4545
"TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256",
46-
"TLS_RSA_WITH_AES_128_CBC_SHA256"
46+
Runtime.version().feature() < 24 ? "TLS_RSA_WITH_AES_128_CBC_SHA256" : "TLS_AES_256_GCM_SHA384"
4747
)
4848
)
4949
);

‎x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/transport/SecurityServerTransportInterceptorTests.java‎

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@@ -1130,7 +1130,7 @@ public void testProfileFiltersCreatedDifferentlyForDifferentTransportAndRemoteCl
11301130
mock(SslKeyConfig.class),
11311131
randomFrom(SslVerificationMode.values()),
11321132
SslClientAuthenticationMode.NONE,
1133-
List.of("TLS_RSA_WITH_AES_256_GCM_SHA384"),
1133+
List.of(Runtime.version().feature() < 24 ? "TLS_RSA_WITH_AES_256_GCM_SHA384" : "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256"),
11341134
List.of("TLSv1.2")
11351135
)
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);

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