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Home Articles

Secure Coding Techniques in Java- All You Need To Know

by Feeba Mahin
November 23, 2022
in Articles, Java Programming
Secure Coding Techniques in Java-All You Need To Know
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Security is one of the most complex, broad, and important aspects of software development. Software security is also frequently overlooked, or oversimplified to just a few minor adjustments at the end of the development cycle. We can see the results in the annual list of major data security breaches, which in 2019 amounted to over 3 billion exposed records. If it can happen to Capital One, it can happen to you.

The good news is that Java is a longstanding development platform with many built-in security features. The Java Security package has undergone intensive battle testing, and is frequently updated for new security vulnerabilities.

But even with a solid development platform, it is important to stay vigilant. Application development is a complex undertaking, and vulnerabilities can hide in the background noise. You should be thinking about security at every stage of application development, from class-level language features to API endpoint authorization.

Thirteen rules for developing secure Java applications

The following ground rules offer a good foundation for building more secure Java applications.

Java security rule #1: Write clean, strong Java code

Keep your code as simple as possible without sacrificing functionality.

Always expose as little information as possible in your code. Hiding implementation details supports code that is both maintainable and secure. These three tips will go a long way toward writing secure Java code:

  • Make good use of Java’s access modifiers. Knowing how to declare different access levels for classes, methods, and their attributes will go a long way to protecting your code. Everything that can be made private, should be private.
  • Avoid reflection and introspection. There are some cases where such advanced techniques are merited, but for the most part you should avoid them. Using reflection eliminates strong typing, which can introduce weak points and instability to your code. Comparing class names as strings is prone to error and can easily lead to collision of namespace.
  • Always define the smallest possible API and interface surfaces. Decouple components and make them interact across the smallest area possible. Even if one area of your application is infected by a breach, others will be safe.

Java security rule #2: Avoid serialization

This is another coding tip, but it’s important enough to be a rule of its own. Serialization takes a remote input and transforms it into a fully endowed object. It dispenses with constructors and access modifiers, and allows for a stream of unknown data to become running code in the JVM. As a result, Java serialization is deeply and inherently insecure.

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Java security rule #3: Never expose unencrypted credentials or PII

It’s hard to believe, but this avoidable mistake causes pain year after year.

When a user enters a password into the browser, it is sent as plaintext to your server. That should be the last time it sees the light of day. You must encrypt the password through a one-way cypher before persisting it to the database, and then do it again whenever you compare against that value.

The rules for passwords apply to all personally identifiable information (PII): credit cards, social security numbers, etc. Any personal information entrusted to your application should be treated with the highest level of care.

Unencrypted credentials or PII in a database is a gaping security hole, waiting for an attacker to discover. Likewise, never write raw credentials to a log, or otherwise transmit to file or network. Instead, create a salted hash for your passwords. Be sure to do your research and use a recommended hashing algorithm.

Java security rule #4: Use known and tested libraries

Use known, reliable libraries and frameworks whenever possible. This applies across the spectrum, from password hashing to REST API authorization.

Fortunately, Java and its ecosystem have your back here. For application security, Spring Security is the de facto standard. It offers a wide-range of options and the flexibility to fit with any app architecture, and it incorporate a range of security approaches.

Your first instinct in tackling security should be to do your research. Research best-practices, and then research what library will implement those practices for you.

Even using a reliable tool, it is fairly easy to bungle authorization and authentication. Be sure to move slowly and double check everything you do.

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Java security rule #5: Be paranoid about external input

Whether it comes from a user typing into a form, a datastore, or a remote API, never trust external input.

SQL injection and cross-site scripting (XSS) are just the most commonly known attacks that can result from mishandling external input.

Anytime you receive input, it should be sanity checked and sanitized. This is especially true of anything that might be presented to another tool or system for processing. For example, if something could wind up as an argument for a OS command-line: beware!

A special and well-known instance is SQL injection, which is covered in the next rule.

Java security rule #6: Always use prepared statements to handle SQL parameters

Anytime you build up an SQL statement, you risk inserting a fragment of executable code.

Knowing this, it’s a good practice to always use the java.sql.PreparedStatement class to create SQL. Similar facilities exist for NoSQL stores like MongoDB. If you are using an ORM layer, the implementation will use PreparedStatements for you under the hood.

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Java security rule #7: Don’t reveal implementation via error messages

Error messages in production can be a fertile source of information for attackers. Stack traces, especially, can reveal information about the technology you are using and how you are using it. Avoid revealing stack traces to end users.

Failed-login alerts also fall into this category. It is generally accepted that an error message should be given as “Login failed” versus “Did not find that user” or “Incorrect password.” Offer as little help to potentially nefarious users as possible.

Ideally, error messages should not reveal the underlying technology stack for your application. Keep that information as opaque as possible.

Java security rule #8: Keep security releases up to date

As of 2019, Oracle has implemented a new licensing scheme and release schedule for Java. Unfortunately for developers, the new release does not make things easier. Nonetheless, you are responsible for frequently checking for security updates and applying them to your JRE and JDK.

Make sure you know what critical patches are available by regularly checking the Oracle homepage for security alerts. Every quarter, Oracle delivers an automated patch update for the current LTS (long-term-support) release of Java. The trouble is, that patch is only available if you are paying for a Java support license.

Java security rule #9: Look for dependency vulnerabilities

There are many tools available to automatically scan your codebase and dependencies for vulnerabilities. All you have to do is use them.

OWASP, the Open Web Application Security Project, is an organization dedicated to improving code security. OWASP’s list of trusted, high-quality automated code scanning tools includes several Java-oriented tools.

Check your codebase regularly, but also keep an eye on third-party dependencies. Attackers target both open- and closed-source libraries. Watch for updates to your dependencies, and update your system as new security fixes are released.

Java security rule #10: Monitor and log user activity

Even a simple brute-force attack can be successful if you aren’t actively monitoring your application. Use monitoring and logging tools to keep an eye on app health.

If you’d like to be convinced why monitoring is important, just sit and watch TCP packets on your applications listening port. You’ll see all kinds of activity, well beyond simple user interactions. Some of that activity will be bots and evil-doers scanning for vulnerabilities.

You should be logging and monitoring for failed login attempts and deploying counter-measures to prevent remote clients from attacking with impunity.

Monitoring can alert you to unexplained spikes, and logging can help unravel what went wrong following an attack.

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Java security rule #11: Watch out for Denial of Service (DoS) attacks

Anytime you are processing potentially expensive resources or undertaking potentially expensive operations, you should guard against runaway resource usage.

Oracle maintains a list of potential vectors for this type of problem in its Secure Coding Guidelines for Java SE document, under the “Denial Of Service” heading.

Basically, anytime you go to perform an expensive operation, like unzipping a compressed file, you should monitor for exploding resource usage. Don’t trust file manifests. Trust only the actual on-disk or in-memory consumption, monitor it, and guard against bring-the-server-to-its-knees excesses.

Java security rule #12: Consider using the Java security manager

Java has a security manager that can be used to restrict the resources a running process has access to. It can isolate the program with respect to disk, memory, network, and JVM access. Narrowing down these requirements for your app reduces the footprint of possible harm from an attack. Such isolation can also be inconvenient, which is why SecurityManager isn’t enabled by default.

Java security rule #13: Consider using an external cloud authentication service

Some applications simply must own their user data; for the rest, a cloud service provider could make sense.

Search around and you’ll find a range of cloud authentication providers. The benefit of such a service is that the provider is responsible for securing sensitive user data, not you. On the other hand, adding an authentication service increases the complexity of your enterprise architecture. Some solutions, like FireBase Authentication, include SDKs for integrating across the stack.

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Conclusion

I’ve presented 13 rules for developing more secure Java applications. These rules are tried-and-true, but the greatest rule of all is this: be suspicious. Always approach software development with a security-minded outlook. Look for vulnerabilities in your code, take advantage of the Java security APIs and packages, and use third-party tools to monitor and log your code for security issues.

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Feeba Mahin

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