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add security features + java property support

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- set `ALLOW_PLANTUML_INCLUDE` only once and decentralized inside the `DiagramResponse` class and call this init method after initializing the server
- set `PLANTUML_SECURITY_PROFILE` to `INTERNET` by default (BREAKING CHANGES)
- add possibility to set PlantUML system properties over a file with `PLANTUML_PROPERTY_FILE`
- adjust documentation
- add "Breaking changes" hint to README
This commit is contained in:
HeinrichAD 2023-06-10 18:34:27 +02:00 committed by PlantUML
parent 5fa6cbc82f
commit 09a7ce4973
7 changed files with 88 additions and 54 deletions
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15
README.md
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@ -16,7 +16,12 @@
PlantUML Server is a web application to generate UML diagrams on-the-fly.
[PlantUML is **not** affected by the log4j vulnerability.](https://github.com/plantuml/plantuml/issues/826)
> [PlantUML is **not** affected by the log4j vulnerability.](https://github.com/plantuml/plantuml/issues/826)
> **Breaking changes**:
> PlantUML Server sets `PLANTUML_SECURITY_PROFILE` to `INTERNET` by default starting with version `v1.2023.9`.
> You can change its behavior back to work like before if you set the environment variable `PLANTUML_SECURITY_PROFILE` to `LEGACY`.
> But before you do that, please take a look to [PlantUMLs Security](https://plantuml.com/security) page.
![PlantUML Server](https://raw.githubusercontent.com/plantuml/plantuml-server/master/docs/screenshot.png)
@ -119,6 +124,7 @@ You can set all the following variables:
* Default value: `ROOT`
* `PLANTUML_CONFIG_FILE`
* Local path to a PlantUML configuration file (identical to the `-config` flag on the CLI)
* File content will be added before each PlantUML diagram code.
* Default value: `null`
* `PLANTUML_LIMIT_SIZE`
* Limits image width and height
@ -135,6 +141,13 @@ You can set all the following variables:
* `ALLOW_PLANTUML_INCLUDE`
* Enables `!include` processing which can read files from the server into diagrams. Files are read relative to the current working directory.
* Default value: `false`
* `PLANTUML_SECURITY_PROFILE`
* Set PlantUML security profile. See [PlantUML security](https://plantuml.com/security).
* Default value: `INTERNET`
* `PLANTUML_PROPERTY_FILE`
* Set PlantUML system properties (like over the Java command line using the `-Dpropertyname=value` syntax).
* To see what kind of file content is supported, see the documentation of [`java.util.Properties.load`](https://docs.oracle.com/javase/8/docs/api/java/util/Properties.html#load-java.io.Reader-).
* Default value: `null`
## Alternate: How to build your docker image

88
src/main/java/net/sourceforge/plantuml/servlet/DiagramResponse.java
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@ -48,6 +48,8 @@ import net.sourceforge.plantuml.core.DiagramDescription;
import net.sourceforge.plantuml.core.ImageData;
import net.sourceforge.plantuml.error.PSystemError;
import net.sourceforge.plantuml.preproc.Defines;
import net.sourceforge.plantuml.security.SecurityProfile;
import net.sourceforge.plantuml.security.SecurityUtils;
import net.sourceforge.plantuml.version.Version;
/**
@ -61,13 +63,18 @@ public class DiagramResponse {
*/
private static final String POWERED_BY = "PlantUML Version " + Version.versionString();
/**
* PLANTUML_CONFIG_FILE content.
*/
private static final List<String> CONFIG = new ArrayList<>();
/**
* Cache/flag to ensure that the `init()` method is called only once.
*/
private static boolean initialized = false;
static {
OptionFlags.ALLOW_INCLUDE = false;
if ("true".equalsIgnoreCase(System.getenv("ALLOW_PLANTUML_INCLUDE"))) {
OptionFlags.ALLOW_INCLUDE = true;
}
init();
}
/**
@ -96,6 +103,43 @@ public class DiagramResponse {
request = req;
}
/**
* Initialize PlantUML configurations and properties as well as loading the PlantUML config file.
*/
public static void init() {
if (initialized) {
return;
}
initialized = true;
// set allow include to false by default
OptionFlags.ALLOW_INCLUDE = false;
if ("true".equalsIgnoreCase(System.getenv("ALLOW_PLANTUML_INCLUDE"))) {
OptionFlags.ALLOW_INCLUDE = true;
}
// set security profile to INTERNET by default
// NOTE: this property is cached inside PlantUML and cannot be changed after the first call of PlantUML
System.setProperty("PLANTUML_SECURITY_PROFILE", SecurityProfile.INTERNET.toString());
if (System.getenv("PLANTUML_SECURITY_PROFILE") != null) {
System.setProperty("PLANTUML_SECURITY_PROFILE", System.getenv("PLANTUML_SECURITY_PROFILE"));
}
// load properties from file
if (System.getenv("PLANTUML_PROPERTY_FILE") != null) {
try (FileReader propertyFileReader = new FileReader(System.getenv("PLANTUML_PROPERTY_FILE"))) {
System.getProperties().load(propertyFileReader);
} catch (IOException e) {
e.printStackTrace();
}
}
// load PlantUML config file
if (System.getenv("PLANTUML_CONFIG_FILE") != null) {
try (BufferedReader br = new BufferedReader(new FileReader(System.getenv("PLANTUML_CONFIG_FILE")))) {
br.lines().forEach(CONFIG::add);
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* Render and send a specific uml diagram.
*
@ -108,23 +152,8 @@ public class DiagramResponse {
response.addHeader("Access-Control-Allow-Origin", "*");
response.setContentType(getContentType());
if (CONFIG.size() == 0 && System.getenv("PLANTUML_CONFIG_FILE") != null) {
// Read config
final BufferedReader br = new BufferedReader(new FileReader(System.getenv("PLANTUML_CONFIG_FILE")));
if (br == null) {
return;
}
try {
String s = null;
while ((s = br.readLine()) != null) {
CONFIG.add(s);
}
} finally {
br.close();
}
}
SourceStringReader reader = new SourceStringReader(Defines.createEmpty(), uml, CONFIG);
final Defines defines = getPreProcDefines();
SourceStringReader reader = new SourceStringReader(defines, uml, CONFIG);
if (CONFIG.size() > 0 && reader.getBlocks().get(0).getDiagram().getWarningOrError() != null) {
reader = new SourceStringReader(uml);
}
@ -156,6 +185,23 @@ public class DiagramResponse {
diagram.exportDiagram(response.getOutputStream(), idx, new FileFormatOption(format));
}
/**
* Get PlantUML preprocessor defines.
*
* @return preprocessor defines
*/
private Defines getPreProcDefines() {
final Defines defines;
if (SecurityUtils.getSecurityProfile() == SecurityProfile.UNSECURE) {
// set dirpath to current dir but keep filename and filenameNoExtension undefined
defines = Defines.createWithFileName(new java.io.File("dummy.puml"));
defines.overrideFilename("");
} else {
defines = Defines.createEmpty();
}
return defines;
}
/**
* Is block uml unmodified?
*

14
src/main/java/net/sourceforge/plantuml/servlet/PlantUmlServlet.java
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@ -34,7 +34,6 @@ import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import net.sourceforge.plantuml.OptionFlags;
import net.sourceforge.plantuml.api.PlantumlUtils;
import net.sourceforge.plantuml.code.NoPlantumlCompressionException;
import net.sourceforge.plantuml.png.MetadataTag;
@ -55,6 +54,12 @@ import net.sourceforge.plantuml.servlet.utility.UrlDataExtractor;
@SuppressWarnings("SERIAL")
public class PlantUmlServlet extends AsciiCoderServlet {
static {
// Initialize the PlantUML server.
// You could say that this is like the `static void main(String[] args)` of the PlantUML server.
DiagramResponse.init();
}
/**
* Default encoded uml text.
* Bob -> Alice : hello
@ -66,13 +71,6 @@ public class PlantUmlServlet extends AsciiCoderServlet {
return "uml";
}
static {
OptionFlags.ALLOW_INCLUDE = false;
if ("true".equalsIgnoreCase(System.getenv("ALLOW_PLANTUML_INCLUDE"))) {
OptionFlags.ALLOW_INCLUDE = true;
}
}
/**
* Encode arbitrary string to HTML string.
*

8
src/main/java/net/sourceforge/plantuml/servlet/ProxyServlet.java
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@ -41,7 +41,6 @@ import jakarta.servlet.http.HttpServletResponse;
import net.sourceforge.plantuml.BlockUml;
import net.sourceforge.plantuml.FileFormat;
import net.sourceforge.plantuml.OptionFlags;
import net.sourceforge.plantuml.SourceStringReader;
import net.sourceforge.plantuml.core.Diagram;
import net.sourceforge.plantuml.core.UmlSource;
@ -54,13 +53,6 @@ import net.sourceforge.plantuml.core.UmlSource;
@SuppressWarnings("SERIAL")
public class ProxyServlet extends HttpServlet {
static {
OptionFlags.ALLOW_INCLUDE = false;
if ("true".equalsIgnoreCase(System.getenv("ALLOW_PLANTUML_INCLUDE"))) {
OptionFlags.ALLOW_INCLUDE = true;
}
}
public static boolean forbiddenURL(String full) {
if (full == null) {
return true;

8
src/main/java/net/sourceforge/plantuml/servlet/UmlDiagramService.java
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@ -34,7 +34,6 @@ import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import net.sourceforge.plantuml.FileFormat;
import net.sourceforge.plantuml.OptionFlags;
import net.sourceforge.plantuml.servlet.utility.UmlExtractor;
import net.sourceforge.plantuml.servlet.utility.UrlDataExtractor;
@ -44,13 +43,6 @@ import net.sourceforge.plantuml.servlet.utility.UrlDataExtractor;
@SuppressWarnings("SERIAL")
public abstract class UmlDiagramService extends HttpServlet {
static {
OptionFlags.ALLOW_INCLUDE = false;
if ("true".equalsIgnoreCase(System.getenv("ALLOW_PLANTUML_INCLUDE"))) {
OptionFlags.ALLOW_INCLUDE = true;
}
}
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
final String url = request.getRequestURI();

8
src/main/java/net/sourceforge/plantuml/servlet/utility/UmlExtractor.java
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@ -29,7 +29,6 @@ import java.net.URLDecoder;
import net.sourceforge.plantuml.FileFormat;
import net.sourceforge.plantuml.FileFormatOption;
import net.sourceforge.plantuml.OptionFlags;
import net.sourceforge.plantuml.SourceStringReader;
import net.sourceforge.plantuml.code.Transcoder;
import net.sourceforge.plantuml.code.TranscoderUtil;
@ -42,13 +41,6 @@ import net.sourceforge.plantuml.core.ImageData;
*/
public abstract class UmlExtractor {
static {
OptionFlags.ALLOW_INCLUDE = false;
if ("true".equalsIgnoreCase(System.getenv("ALLOW_PLANTUML_INCLUDE"))) {
OptionFlags.ALLOW_INCLUDE = true;
}
}
/**
* Build the complete UML source from the compressed source extracted from the
* HTTP URI.

1
src/main/webapp/WEB-INF/web.xml
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@ -71,6 +71,7 @@
<servlet>
<servlet-name>plantumlservlet</servlet-name>
<servlet-class>net.sourceforge.plantuml.servlet.PlantUmlServlet</servlet-class>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>plantumlservlet</servlet-name>