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markt pushed a commit to branch 10.1.x
in repository https://gitbox.apache.org/repos/asf/tomcat.git
The following commit(s) were added to refs/heads/10.1.x by this push:
new caab2b9250 Improve CVE-2024-56337 protection
caab2b9250 is described below
commit caab2b9250346d140c920653dc395c99dc044a1a
Author: Mark Thomas <[email protected]>
AuthorDate: Fri Feb 21 11:54:55 2025 +0000
Improve CVE-2024-56337 protection
Don't use reflection unless necessary. This means less impact for those
using Tomcat in an embedded environment.
---
bin/catalina.bat | 1 +
bin/catalina.sh | 1 +
.../org/apache/tomcat/util/compat/Jre12Compat.java | 151 +++++++++++++++++++++
.../org/apache/tomcat/util/compat/Jre16Compat.java | 2 +-
java/org/apache/tomcat/util/compat/JreCompat.java | 132 ++++++++++++++----
.../tomcat/util/compat/LocalStrings.properties | 2 +
webapps/docs/changelog.xml | 6 +-
7 files changed, 263 insertions(+), 32 deletions(-)
diff --git a/bin/catalina.bat b/bin/catalina.bat
index 5e1a3e8006..af97bedc4c 100755
--- a/bin/catalina.bat
+++ b/bin/catalina.bat
@@ -226,6 +226,7 @@ set
LOGGING_MANAGER=-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogMa
rem Configure module start-up parameters
set "JAVA_OPTS=%JAVA_OPTS% --add-opens=java.base/java.lang=ALL-UNNAMED"
+set "JAVA_OPTS=%JAVA_OPTS% --add-opens=java.base/java.lang.reflect=ALL-UNNAMED"
set "JAVA_OPTS=%JAVA_OPTS% --add-opens=java.base/java.io=ALL-UNNAMED"
set "JAVA_OPTS=%JAVA_OPTS% --add-opens=java.base/java.util=ALL-UNNAMED"
set "JAVA_OPTS=%JAVA_OPTS%
--add-opens=java.base/java.util.concurrent=ALL-UNNAMED"
diff --git a/bin/catalina.sh b/bin/catalina.sh
index 959a637389..abc43a6117 100755
--- a/bin/catalina.sh
+++ b/bin/catalina.sh
@@ -299,6 +299,7 @@ fi
# Add the module start-up parameters required by Tomcat
JAVA_OPTS="$JAVA_OPTS --add-opens=java.base/java.lang=ALL-UNNAMED"
+JAVA_OPTS="$JAVA_OPTS --add-opens=java.base/java.lang.reflect=ALL-UNNAMED"
JAVA_OPTS="$JAVA_OPTS --add-opens=java.base/java.io=ALL-UNNAMED"
JAVA_OPTS="$JAVA_OPTS --add-opens=java.base/java.util=ALL-UNNAMED"
JAVA_OPTS="$JAVA_OPTS --add-opens=java.base/java.util.concurrent=ALL-UNNAMED"
diff --git a/java/org/apache/tomcat/util/compat/Jre12Compat.java
b/java/org/apache/tomcat/util/compat/Jre12Compat.java
new file mode 100644
index 0000000000..ea27f455f4
--- /dev/null
+++ b/java/org/apache/tomcat/util/compat/Jre12Compat.java
@@ -0,0 +1,151 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.tomcat.util.compat;
+
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodHandles.Lookup;
+import java.lang.invoke.VarHandle;
+import java.lang.management.ManagementFactory;
+import java.lang.reflect.Field;
+import java.lang.reflect.InaccessibleObjectException;
+import java.lang.reflect.Modifier;
+import java.util.List;
+import java.util.Optional;
+
+import org.apache.juli.logging.Log;
+import org.apache.juli.logging.LogFactory;
+import org.apache.tomcat.util.res.StringManager;
+
+public class Jre12Compat extends JreCompat {
+
+ private static final Log log = LogFactory.getLog(Jre12Compat.class);
+ private static final StringManager sm =
StringManager.getManager(Jre12Compat.class);
+
+ private static final boolean supported;
+
+ static {
+ // Don't need any Java 12 specific classes (yet) so just test for one
of
+ // the new ones for now.
+ Class<?> c1 = null;
+ try {
+ c1 = Class.forName("java.text.CompactNumberFormat");
+ } catch (ClassNotFoundException cnfe) {
+ // Must be pre-Java 12
+ log.debug(sm.getString("jre12Compat.javaPre12"), cnfe);
+ }
+
+ supported = (c1 != null);
+ }
+
+ static boolean isSupported() {
+ return supported;
+ }
+
+
+ /*
+ * The behaviour of the canonical file name cache varies by Java version.
+ *
+ * The cache was removed in Java 21 so these methods and the associated
code can be removed once the minimum Java
+ * version is 21.
+ *
+ * For 12 <= Java <= 20, the cache was present but disabled by default.
+ *
+ * For Java < 12, the cache was enabled by default. Tomcat assumes the
cache is enabled unless proven otherwise.
+ *
+ * Tomcat 10.1 has a minimum Java version of 11.
+ *
+ * The static field in java.io.FileSystem will be set before any
application code gets a chance to run. Therefore,
+ * the value of that field can be determined by looking at the command
line arguments. This enables us to determine
+ * the status without having using reflection.
+ *
+ * This is Java 12 and later.
+ */
+ @Override
+ public boolean isCanonCachesDisabled() {
+ if (canonCachesDisabled != null) {
+ return canonCachesDisabled.booleanValue();
+ }
+ synchronized (canonCachesDisabledLock) {
+ if (canonCachesDisabled != null) {
+ return canonCachesDisabled.booleanValue();
+ }
+
+ List<String> args =
ManagementFactory.getRuntimeMXBean().getInputArguments();
+ for (String arg : args) {
+ // If any command line argument attempts to enable the cache,
assume it is enabled.
+ if (arg.startsWith(USE_CANON_CACHES_CMD_ARG)) {
+ String value =
arg.substring(USE_CANON_CACHES_CMD_ARG.length());
+ boolean cacheEnabled =
Boolean.valueOf(value).booleanValue();
+ if (cacheEnabled) {
+ canonCachesDisabled = Boolean.FALSE;
+ return false;
+ }
+ }
+ }
+ canonCachesDisabled = Boolean.TRUE;
+ return true;
+ }
+ }
+
+
+ /*
+ * Java 12 increased security around reflection so additional code is
required to disable the cache since a final
+ * field needs to be changed.
+ */
+ @Override
+ protected void ensureUseCanonCachesFieldIsPopulated() {
+ if (useCanonCachesField != null) {
+ return;
+ }
+ synchronized (useCanonCachesFieldLock) {
+ if (useCanonCachesField != null) {
+ return;
+ }
+
+ Field f = null;
+ try {
+ Class<?> clazz = Class.forName("java.io.FileSystem");
+ f = clazz.getDeclaredField("useCanonCaches");
+ // Need this because the 'useCanonCaches' field is private
+ f.setAccessible(true);
+
+ /*
+ * Need this in Java 12 to 17 (and it only works up to Java
17) because the 'useCanonCaches' field is
+ * final.
+ *
+ * This will fail in Java 18 to 20 but since those versions
are no longer supported it is acceptable for
+ * the attempt to set the 'useCanonCaches' field to fail.
Users that really want to use Java 18 to 20
+ * will have to ensure that they do not explicitly enable the
canonical file name cache.
+ */
+ VarHandle modifiers;
+ Lookup lookup = MethodHandles.privateLookupIn(Field.class,
MethodHandles.lookup());
+ modifiers = lookup.findVarHandle(Field.class, "modifiers",
int.class);
+ modifiers.set(f, f.getModifiers() & ~Modifier.FINAL);
+ } catch (InaccessibleObjectException |
ReflectiveOperationException | IllegalArgumentException e) {
+ // Make sure field is not set.
+ f = null;
+ log.warn(sm.getString("jreCompat.useCanonCaches.init"), e);
+ }
+
+ if (f == null) {
+ useCanonCachesField = Optional.empty();
+ } else {
+ useCanonCachesField = Optional.of(f);
+ }
+ }
+ }
+}
diff --git a/java/org/apache/tomcat/util/compat/Jre16Compat.java
b/java/org/apache/tomcat/util/compat/Jre16Compat.java
index c4d6f3f1d1..70e5fb1094 100644
--- a/java/org/apache/tomcat/util/compat/Jre16Compat.java
+++ b/java/org/apache/tomcat/util/compat/Jre16Compat.java
@@ -28,7 +28,7 @@ import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.res.StringManager;
-class Jre16Compat extends JreCompat {
+class Jre16Compat extends Jre12Compat {
private static final Log log = LogFactory.getLog(Jre16Compat.class);
private static final StringManager sm =
StringManager.getManager(Jre16Compat.class);
diff --git a/java/org/apache/tomcat/util/compat/JreCompat.java
b/java/org/apache/tomcat/util/compat/JreCompat.java
index e188d57ed1..a0feab9f3f 100644
--- a/java/org/apache/tomcat/util/compat/JreCompat.java
+++ b/java/org/apache/tomcat/util/compat/JreCompat.java
@@ -16,12 +16,15 @@
*/
package org.apache.tomcat.util.compat;
+import java.lang.management.ManagementFactory;
import java.lang.reflect.Field;
import java.lang.reflect.InaccessibleObjectException;
import java.net.SocketAddress;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.security.PrivilegedExceptionAction;
+import java.util.List;
+import java.util.Optional;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletionException;
@@ -42,12 +45,17 @@ public class JreCompat {
private static final JreCompat instance;
private static final boolean graalAvailable;
+ private static final boolean jre12Available;
private static final boolean jre16Available;
private static final boolean jre19Available;
private static final boolean jre21Available;
private static final boolean jre22Available;
- private static final Field useCanonCachesField;
+ protected static final String USE_CANON_CACHES_CMD_ARG =
"-Dsun.io.useCanonCaches=";
+ protected static volatile Boolean canonCachesDisabled;
+ protected static final Object canonCachesDisabledLock = new Object();
+ protected static volatile Optional<Field> useCanonCachesField;
+ protected static final Object useCanonCachesFieldLock = new Object();
static {
boolean result = false;
@@ -69,46 +77,43 @@ public class JreCompat {
jre21Available = true;
jre19Available = true;
jre16Available = true;
+ jre12Available = true;
} else if (Jre21Compat.isSupported()) {
instance = new Jre21Compat();
jre22Available = false;
jre21Available = true;
jre19Available = true;
jre16Available = true;
+ jre12Available = true;
} else if (Jre19Compat.isSupported()) {
instance = new Jre19Compat();
jre22Available = false;
jre21Available = false;
jre19Available = true;
jre16Available = true;
+ jre12Available = true;
} else if (Jre16Compat.isSupported()) {
instance = new Jre16Compat();
jre22Available = false;
jre21Available = false;
jre19Available = false;
jre16Available = true;
+ jre12Available = true;
+ } else if (Jre12Compat.isSupported()) {
+ instance = new Jre12Compat();
+ jre22Available = false;
+ jre21Available = false;
+ jre19Available = false;
+ jre16Available = false;
+ jre12Available = true;
} else {
instance = new JreCompat();
jre22Available = false;
jre21Available = false;
jre19Available = false;
jre16Available = false;
+ jre12Available = false;
}
-
- Field f1 = null;
- try {
- Class<?> clazz = Class.forName("java.io.FileSystem");
- f1 = clazz.getDeclaredField("useCanonCaches");
- f1.setAccessible(true);
- } catch (InaccessibleObjectException | ReflectiveOperationException |
IllegalArgumentException e) {
- /*
- * Log at debug level as this will only be an issue if the field
needs to be accessed and most
- * configurations will not need to do so. Appropriate warnings
will be logged if an attempt is made to use
- * the field when it could not be found/accessed.
- */
- log.debug(sm.getString("jreCompat.useCanonCaches.init"), e);
- }
- useCanonCachesField = f1;
}
@@ -122,6 +127,11 @@ public class JreCompat {
}
+ public static boolean isJre12Available() {
+ return jre12Available;
+ }
+
+
public static boolean isJre16Available() {
return jre16Available;
}
@@ -286,28 +296,56 @@ public class JreCompat {
/*
- * The behaviour of the canonical file cache varies by Java version.
+ * The behaviour of the canonical file name cache varies by Java version.
*
* The cache was removed in Java 21 so these methods and the associated
code can be removed once the minimum Java
* version is 21.
*
- * For 12 <= Java <= 20, the cache was present but disabled by default.
Since the user may have changed the default
- * Tomcat has to assume the cache is enabled unless proven otherwise.
+ * For 12 <= Java <= 20, the cache was present but disabled by default.
*
* For Java < 12, the cache was enabled by default. Tomcat assumes the
cache is enabled unless proven otherwise.
+ *
+ * Tomcat 10.1 has a minimum Java version of 11.
+ *
+ * The static field in java.io.FileSystem will be set before any
application code gets a chance to run. Therefore,
+ * the value of that field can be determined by looking at the command
line arguments. This enables us to determine
+ * the status without having using reflection.
+ *
+ * This is Java 11.
*/
public boolean isCanonCachesDisabled() {
- if (useCanonCachesField == null) {
- // No need to log a warning. The warning will be logged when
trying to disable the cache.
- return false;
+ if (canonCachesDisabled != null) {
+ return canonCachesDisabled.booleanValue();
}
- boolean result = false;
- try {
- result = !((Boolean) useCanonCachesField.get(null)).booleanValue();
- } catch (ReflectiveOperationException e) {
- // No need to log a warning. The warning will be logged when
trying to disable the cache.
+ synchronized (canonCachesDisabledLock) {
+ if (canonCachesDisabled != null) {
+ return canonCachesDisabled.booleanValue();
+ }
+
+ boolean cacheEnabled = true;
+ List<String> args =
ManagementFactory.getRuntimeMXBean().getInputArguments();
+ for (String arg : args) {
+ // To consider the cache disabled
+ // - there must be at least one command line argument that
disables it
+ // - there must be no command line arguments that enable it
+ if (arg.startsWith(USE_CANON_CACHES_CMD_ARG)) {
+ String valueAsString =
arg.substring(USE_CANON_CACHES_CMD_ARG.length());
+ boolean valueAsBoolean =
Boolean.valueOf(valueAsString).booleanValue();
+ if (valueAsBoolean) {
+ canonCachesDisabled = Boolean.FALSE;
+ return false;
+ } else {
+ cacheEnabled = false;
+ }
+ }
+ }
+ if (cacheEnabled) {
+ canonCachesDisabled = Boolean.FALSE;
+ } else {
+ canonCachesDisabled = Boolean.TRUE;
+ }
+ return canonCachesDisabled.booleanValue();
}
- return result;
}
@@ -318,16 +356,50 @@ public class JreCompat {
* as a result of this call, otherwise {@code false}
*/
public boolean disableCanonCaches() {
- if (useCanonCachesField == null) {
+ ensureUseCanonCachesFieldIsPopulated();
+ if (useCanonCachesField.isEmpty()) {
log.warn(sm.getString("jreCompat.useCanonCaches.none"));
return false;
}
try {
- useCanonCachesField.set(null, Boolean.FALSE);
+ useCanonCachesField.get().set(null, Boolean.FALSE);
} catch (ReflectiveOperationException | IllegalArgumentException e) {
log.warn(sm.getString("jreCompat.useCanonCaches.failed"), e);
return false;
}
+ synchronized (canonCachesDisabledLock) {
+ canonCachesDisabled = Boolean.TRUE;
+ }
return true;
}
+
+
+ protected void ensureUseCanonCachesFieldIsPopulated() {
+ if (useCanonCachesField != null) {
+ return;
+ }
+ synchronized (useCanonCachesFieldLock) {
+ if (useCanonCachesField != null) {
+ return;
+ }
+
+ Field f = null;
+ try {
+ Class<?> clazz = Class.forName("java.io.FileSystem");
+ f = clazz.getDeclaredField("useCanonCaches");
+ // Need this because the 'useCanonCaches' field is private
final
+ f.setAccessible(true);
+ } catch (InaccessibleObjectException |
ReflectiveOperationException | IllegalArgumentException e) {
+ // Make sure field is not set.
+ f = null;
+ log.warn(sm.getString("jreCompat.useCanonCaches.init"), e);
+ }
+
+ if (f == null) {
+ useCanonCachesField = Optional.empty();
+ } else {
+ useCanonCachesField = Optional.of(f);
+ }
+ }
+ }
}
diff --git a/java/org/apache/tomcat/util/compat/LocalStrings.properties
b/java/org/apache/tomcat/util/compat/LocalStrings.properties
index 738e2ae4ac..5f8bdaefb2 100644
--- a/java/org/apache/tomcat/util/compat/LocalStrings.properties
+++ b/java/org/apache/tomcat/util/compat/LocalStrings.properties
@@ -16,6 +16,8 @@
# Do not edit this file directly.
# To edit translations see:
https://tomcat.apache.org/getinvolved.html#Translations
+jre12Compat.javaPre12=Method not found so assuming code is running on a
pre-Java 12 JVM
+
jre16Compat.javaPre16=Class not found so assuming code is running on a
pre-Java 16 JVM
jre16Compat.unexpected=Failed to create references to Java 16 classes and
methods
diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
index cfd1fe14cc..8ad82411bd 100644
--- a/webapps/docs/changelog.xml
+++ b/webapps/docs/changelog.xml
@@ -129,6 +129,10 @@
Fix a bug in the JRE compatibility detection that incorrectly
identified
Java 19 and Java 20 as supporting Java 21 features. (markt)
</fix>
+ <fix>
+ Improve the checks for exposure to and protection against
CVE-2024-56337
+ so that reflection is not used unless required. (markt)
+ </fix>
</changelog>
</subsection>
<subsection name="Coyote">
@@ -160,7 +164,7 @@
<fix>
<bug>69576</bug>: Avoid possible failure intializing
<code>JreCompat</code> due to uncaught exception introduced for the
- check for CVE-2004-56337. (remm)
+ check for CVE-2024-56337. (remm)
</fix>
</changelog>
</subsection>
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