Targeted Code Reviews in Regulated Industries
Erik Dietrich explains why targeted code reviews are ideal in regulated industries and covers a couple of targeted code review techniques.
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Editorial Note: I originally wrote this post for the SmartBear blog. You can check out the original here, at their site. While you’re there, check out the work of the other authors writing for them, as well.
For a lot of people out there developing software, life is pretty simple. I say this not because there’s anything simple about software development, but because life around the practice of software development is simple. You come in around 9, spend the day doing what the software needs to have done to it, and you go home at 5. Maybe every now and then you stay late some days to make a push.
As organizations get bigger and more specialized, however, the outlook starts to change. Growth brings larger and larger headcount, which, in turn, means more communication channels and general, bureaucratic overhead. Growth also brings more outsider scrutiny and general public interest, particularly as companies go public and make headlines. Such organizations start to become regulated.
Simply put, a regulated organization is one in which the government takes an interest. Legislation about how the organization must behave is created, enacted, and enforced, the latter often coming in the form of check-ups, inspections, or audits. Large companies may find themselves regulated in ad hoc fashion, or it may happen due to their size and public influence. Other companies are regulated at any size, simply by virtue of their industry. This latter designation applies to the finance, energy, healthcare, and defense industries, to name a few.
The Productivity Impact of Regulation
However your company comes to be regulated, the impact on you, as a software developer, is noticeable. You have to do stuff with which your peers at other organizations needn’t bother. You need to follow certain protocols for database access or document your code in certain ways. Often times, and at larger organizations, this takes on a “death by a thousand cuts” status in your life and it starts to feel as though you do a lot more box-checking than software development.
This, in spite of the importance of complying with this regulations, is an untenable state of affairs for a group. To put a point on it with hyperbole, one surefire way to have your software comply with all regulations is not to write any software. While that’s clearly never the actual mission of your company, it can sometimes feel that way as regulation compliance starts to swallow your time.
Targeted Code Review
Code review, properly applied, can help.
In this case, however, I’m not talking about what most of us think of as the standard code review. The standard code review is one in which groups put a second (or third, fourth, etc.) set of eyes on each change-set committed by a developer to look for anything that might seem amiss. That’s an activity with plenty of value, but in the “death by a thousand cuts” world, it just means 500 cuts for each person.
To combat the problem of all developers needing to have too many compliance concerns in their head at all times, a helpful strategy is to specialize, at least when it comes to code review purview. Specializing in code is a dicey proposition because it leads to silos and hoarding of knowledge. However, specializing in review purview can help to relieve the pressure on each developer to keep dozens of checklist items in his or her head.
Make no mistake; this is not an activity designed to absolve individuals of any responsibility for regulatory compliance in their code. Rather, it is intended to eliminate the need for everyone to be equally expert on all things compliance-related. 90% becomes “good enough for the rest to be caught at review,” meaning that developers don’t need to incur diminishing returns on their time chasing the last 10%. They can move on, let the expert catch that last 10%, learn from the expert so that next time it’s 95% vs. 5%, and so on.
This is also not meant to replace the standard form of code review. Rather, it’s meant to complement it and to be an addition. Perform your normal code reviews for general code quality and work-checking, and then perform batched, specialized reviews for compliance as well.
Let’s take a look at some examples of what this might look like. What are some specialized types of code review?
Security and Threat Modeling
With this style of targeted code review, you’d have someone who focused specifically on threat modeling. They wouldn’t be looking for odd use of design patterns or better encapsulation schemes or anything generalized. Rather, they’d be looking at the code purely from the perspective of how it might be exploited. This could, frankly, be applicable to just about any organization, but ones for that an exploit would be disastrous, such as financial institutions, come to mind.
Would the code get into an exploitable state if it generated an exception here? Is this call to the logger dumping anything that is too sensitive for operations to see? Is the person passing these strings to the proper encrypting utility?
These are the types of questions that the specialized security reviewer would be asking. He’d then follow up with the developers to help them get better at thinking about these things ahead of time.
It may sound strange to many of you, but there are plenty of developers writing code that directly impacts the physical world. Think of the self-driving car, or, more mundanely, think of the firmware that exists in today’s cars. Think of something like a hearing aid that, turned up too loudly, could blow out someone’s ear drum.
A review for physical safety would involve a domain and code expert looking at changes and asking, “Could someone get hurt with this, somehow?”
Personally Identifiable Information (PII)
Another oft-regulated concern is the management of personally identifiable information. This is of specific concern around legislation like HIPAA, where people are legally entitled to privacy of medical records. This means that companies in the industry have to be extremely diligent about when identifying information is paired with medical information and who can see it.
With this style of code review, someone would be asking questions like “could this anonymized data be de-anonymized in any way” and “are we storing this in such a way that their local admins couldn’t go poking around in people’s records?”
Having these targeted code reviews is important, but there’s an equally important concern for keeping them valuable. They can’t become bureaucratic, check-the-box activities. When the specialized reviewer notices an issue, he or she should have a discussion with the team to make them aware and increase general knowledge on the topic. Or, even better, he or she should conceive of a way to automate the check or write some kind of test for it and make it impossible to make the mistake in the future.
While these reviews are primarily about catching potential problems, they’re more broadly about raising the team’s game without impacting productivity. They can only succeed in this capacity if everyone involved is continuously thinking critically and getting out in front of potential problems.
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