securetempfilecreation.md

Use secure temporary file creation

org.openrewrite.java.security.SecureTempFileCreation

java.io.File.createTempFile() has exploitable default file permissions. This recipe migrates to the more secure java.nio.file.Files.createTempFile().

Source

GitHub, Issue Tracker, Maven Central

• groupId: org.openrewrite.recipe
• artifactId: rewrite-java-security
• version: 2.0.1

Example

{% tabs %} {% tab title="Test.java" %}

Before

{% code title="Test.java" %}

import java.io.File;
import java.io.IOException;

class Test {
    static void method() throws IOException {
        File tempDir = File.createTempFile("hello", "world");
    }
}

{% endcode %}

After

{% code title="Test.java" %}

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;

class Test {
    static void method() throws IOException {
        File tempDir = Files.createTempFile("hello", "world").toFile();
    }
}

{% endcode %}

{% endtab %} {% tab title="Diff" %} {% code %}

--- Test.java
+++ Test.java
@@ -3,0 +3,1 @@
import java.io.File;
import java.io.IOException;
+import java.nio.file.Files;

@@ -6,1 +7,1 @@
class Test {
    static void method() throws IOException {
-       File tempDir = File.createTempFile("hello", "world");
+       File tempDir = Files.createTempFile("hello", "world").toFile();
    }

{% endcode %} {% endtab %} {% endtabs %}

Usage

This recipe has no required configuration options. It can be activated by adding a dependency on org.openrewrite.recipe:rewrite-java-security:2.0.1 in your build file or by running a shell command (in which case no build changes are needed): {% tabs %} {% tab title="Gradle" %} {% code title="build.gradle" %}

plugins {
    id("org.openrewrite.rewrite") version("6.1.4")
}

rewrite {
    activeRecipe("org.openrewrite.java.security.SecureTempFileCreation")
}

repositories {
    mavenCentral()
}

dependencies {
    rewrite("org.openrewrite.recipe:rewrite-java-security:2.0.1")
}

{% endcode %} {% endtab %} {% tab title="Maven POM" %} {% code title="pom.xml" %}

<project>
  <build>
    <plugins>
      <plugin>
        <groupId>org.openrewrite.maven</groupId>
        <artifactId>rewrite-maven-plugin</artifactId>
        <version>5.2.4</version>
        <configuration>
          <activeRecipes>
            <recipe>org.openrewrite.java.security.SecureTempFileCreation</recipe>
          </activeRecipes>
        </configuration>
        <dependencies>
          <dependency>
            <groupId>org.openrewrite.recipe</groupId>
            <artifactId>rewrite-java-security</artifactId>
            <version>2.0.1</version>
          </dependency>
        </dependencies>
      </plugin>
    </plugins>
  </build>
</project>

{% endcode %} {% endtab %}

{% tab title="Maven Command Line" %} {% code title="shell" %} You will need to have Maven installed on your machine before you can run the following command.

mvn -U org.openrewrite.maven:rewrite-maven-plugin:run \
  -Drewrite.recipeArtifactCoordinates=org.openrewrite.recipe:rewrite-java-security:RELEASE \
  -Drewrite.activeRecipes=org.openrewrite.java.security.SecureTempFileCreation

{% endcode %} {% endtab %} {% endtabs %}

Contributors

• Jonathan Leitschuh
• Jonathan Schnéider
• Knut Wannheden
• Scott Jungling
• Sam Snyder

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