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markt pushed a commit to branch main
in repository https://gitbox.apache.org/repos/asf/tomcat.git
commit e34fe96ef8ee782b0e56b64358e8dc57cbe336a6
Author: Mark Thomas <ma...@apache.org>
AuthorDate: Tue Jun 3 16:05:53 2025 +0100
Provide finder grained control of multi-part requests
This exposes two new configuration attributes on the Connector:
- maxPartCount
- maxPartHeaderSize
---
java/org/apache/catalina/connector/Connector.java | 24 +++++++++++++++++++
java/org/apache/catalina/connector/Request.java | 28 ++++++++++++++++++-----
webapps/docs/changelog.xml | 7 ++++++
webapps/docs/config/ajp.xml | 15 ++++++++++++
webapps/docs/config/http.xml | 15 ++++++++++++
webapps/docs/config/http2.xml | 2 ++
6 files changed, 85 insertions(+), 6 deletions(-)
diff --git a/java/org/apache/catalina/connector/Connector.java
b/java/org/apache/catalina/connector/Connector.java
index f9b223f8c2..9ff15c5e9a 100644
--- a/java/org/apache/catalina/connector/Connector.java
+++ b/java/org/apache/catalina/connector/Connector.java
@@ -210,6 +210,10 @@ public class Connector extends LifecycleMBeanBase {
*/
protected int maxParameterCount = 1000;
+ private int maxPartCount = 10;
+
+ private int maxPartHeaderSize = 512;
+
/**
* Maximum size of a POST which will be automatically parsed by the
container. 2 MiB by default.
*/
@@ -479,6 +483,26 @@ public class Connector extends LifecycleMBeanBase {
}
+ public int getMaxPartCount() {
+ return maxPartCount;
+ }
+
+
+ public void setMaxPartCount(int maxPartCount) {
+ this.maxPartCount = maxPartCount;
+ }
+
+
+ public int getMaxPartHeaderSize() {
+ return maxPartHeaderSize;
+ }
+
+
+ public void setMaxPartHeaderSize(int maxPartHeaderSize) {
+ this.maxPartHeaderSize = maxPartHeaderSize;
+ }
+
+
/**
* @return the maximum size of a POST which will be automatically parsed
by the container.
*/
diff --git a/java/org/apache/catalina/connector/Request.java
b/java/org/apache/catalina/connector/Request.java
index 9973996014..4fefd870b4 100644
--- a/java/org/apache/catalina/connector/Request.java
+++ b/java/org/apache/catalina/connector/Request.java
@@ -2382,13 +2382,29 @@ public class Request implements HttpServletRequest {
upload.setFileItemFactory(factory);
upload.setFileSizeMax(mce.getMaxFileSize());
upload.setSizeMax(mce.getMaxRequestSize());
- if (maxParameterCount > -1) {
- // There is a limit. The limit for parts needs to be reduced by
- // the number of parameters we have already parsed.
- // Must be under the limit else parsing parameters would have
- // triggered an exception.
- upload.setFileCountMax(maxParameterCount - parameters.size());
+ upload.setPartHeaderSizeMax(connector.getMaxPartHeaderSize());
+ /*
+ * There are two independent limits on the number of parts.
+ *
+ * 1. The limit based on parameters. This is maxParameterCount less
the number of parameters already processed.
+ *
+ * 2. The limit based on parts. This is maxPartCount.
+ *
+ * The lower of these two limits will be applied to this request.
+ *
+ * Note: Either of both limits may be set to -1 (unlimited).
+ */
+ int partLimit = maxParameterCount;
+ if (partLimit > -1) {
+ partLimit = partLimit - parameters.size();
+ }
+ int maxPartCount = connector.getMaxPartCount();
+ if (maxPartCount > -1) {
+ if (partLimit < 0 || partLimit > maxPartCount) {
+ partLimit = maxPartCount;
+ }
}
+ upload.setFileCountMax(partLimit);
parts = new ArrayList<>();
try {
diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
index da5354ed31..2024fd91c9 100644
--- a/webapps/docs/changelog.xml
+++ b/webapps/docs/changelog.xml
@@ -223,6 +223,13 @@
<code>BlockingQueue</code> implementation. Pull request provided by
Paulo Almeida. (markt)
</scode>
+ <add>
+ Provide finer grained control of multi-part request processing via two
+ new attributes on the <code>Connector</code> element.
+ <code>maxPartCount</code> limits the total number of parts in a
+ multi-part request and <code>maxPartHeaderSize</code> limits the size
of
+ the headers provided with each part. (markt)
+ </add>
</changelog>
</subsection>
<subsection name="Jasper">
diff --git a/webapps/docs/config/ajp.xml b/webapps/docs/config/ajp.xml
index 662c0a27fd..8a1af5750b 100644
--- a/webapps/docs/config/ajp.xml
+++ b/webapps/docs/config/ajp.xml
@@ -185,6 +185,21 @@
default of 1000 is used.</p>
</attribute>
+ <attribute name="maxPartCount" required="false">
+ <p>The maximum total number of parts permitted in a request where the
+ content type is <code>multipart/form-data</code>. This limit is in
+ addition to <code>maxParameterCount</code>. Requests that exceed this
+ limit will be rejected. A value of less than 0 means no limit. If not
+ specified, a default of 10 is used.</p>
+ </attribute>
+
+ <attribute name="maxPartHeaderSize" required="false">
+ <p>The maximum number of header bytes permitted per part in a request
+ where the content type is <code>multipart/form-data</code>. Requests that
+ exceed this limit will be rejected. A value of less than 0 means no
limit.
+ If not specified, a default of 512 is used.</p>
+ </attribute>
+
<attribute name="maxPostSize" required="false">
<p>The maximum size in bytes of the POST which will be handled by
the container FORM URL parameter parsing. The limit can be disabled by
diff --git a/webapps/docs/config/http.xml b/webapps/docs/config/http.xml
index 8d84b06dd9..318d2e23db 100644
--- a/webapps/docs/config/http.xml
+++ b/webapps/docs/config/http.xml
@@ -181,6 +181,21 @@
default of 1000 is used.</p>
</attribute>
+ <attribute name="maxPartCount" required="false">
+ <p>The maximum total number of parts permitted in a request where the
+ content type is <code>multipart/form-data</code>. This limit is in
+ addition to <code>maxParameterCount</code>. Requests that exceed this
+ limit will be rejected. A value of less than 0 means no limit. If not
+ specified, a default of 10 is used.</p>
+ </attribute>
+
+ <attribute name="maxPartHeaderSize" required="false">
+ <p>The maximum number of header bytes permitted per part in a request
+ where the content type is <code>multipart/form-data</code>. Requests that
+ exceed this limit will be rejected. A value of less than 0 means no
limit.
+ If not specified, a default of 512 is used.</p>
+ </attribute>
+
<attribute name="maxPostSize" required="false">
<p>The maximum size in bytes of the POST which will be handled by
the container FORM URL parameter parsing. The limit can be disabled by
diff --git a/webapps/docs/config/http2.xml b/webapps/docs/config/http2.xml
index 079ad57f51..df9ae57d67 100644
--- a/webapps/docs/config/http2.xml
+++ b/webapps/docs/config/http2.xml
@@ -240,6 +240,8 @@
<li>maxHttpHeaderSize</li>
<li>maxHttpRequestHeaderSize</li>
<li>maxParameterCount</li>
+ <li>maxPartCount</li>
+ <li>maxPartHeaderSize</li>
<li>maxPostSize</li>
<li>maxSavePostSize</li>
<li>maxTrailerSize</li>
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