Blesta 3.0: More on Security (video)

August 17, 2012 | Posted by Paul


Back in May our largest competitor WHMCS was compromised, and I wrote a blog post titled “Thoughts on Security“. After my post, the hackers released a data dump and the personal information of their customers became public. Names, email addresses, credit card numbers and more. A nightmare scenario for any company, and worse for their customers.

I got a lot of email, and a few phone calls after that post. People are now, more than ever, concerned about security and they should be. It’s something that cannot be taken for granted, and can no longer be ignored. It requires diligence. There is no such thing as security through obscurity.

Most recently LinkedIn, Dropbox, and Blizzard were all compromised. These are big companies with big budgets and they are big targets, but it highlights the fact that nobody is immune.

Today’s post is sort of a follow up on that last post. I wanted to be more specific in terms of security measures we’ve taken within our software — specifically our next major release, version 3. It’s because we believe security doesn’t come from obscurity that we are so open about the steps we take to protect not just our customer data, but in as far as possible, our customers’ customers.

We don’t claim to know everything there is to know about security, but it’s an area we spend a considerable amount of time in discussion, research, and development. It takes priority over new features in our development cycle.

Passwords

Passwords in v3 are stored using bcrypt, computed from an HMAC-SHA-256 hash of the user password, if supported by the server. The advantage to using bcrypt is that it slows down the time it takes to compute the value. How could slowing it down possibly be good you might ask? Because, if an attacker happens to acquire your users’ hashed passwords, and also the key used to generate the HMAC-SHA-256 hashes, it would be impractical and time consuming to brute force them from a list of common passwords (known as a dictionary attack). Without the HMAC key, it becomes computationally infeasible to brute force (with 2^256 possible combinations of hashed passwords, and a 1/4 second to compute 1 bcrypt password, you would only be able to attempt 126,144,000 bcrypt passwords per year. So, statistically, it would take 4.5897 x10^68 years to crack a single user’s password).

Now, assuming the HMAC key is known, a 60,000 password dictionary file would take statistically 2.083 hours to crack 1 users password assuming the password is in the dictionary to begin with. This is fantastic because it gives you much needed time to reset every users password and notify them, making the leaked hashes virtually useless.

Additionally, a bcrypt password is never the same. If user A and user B both have a password of “hunter2″, the stored values will not be identical.

Two-Factor Authentication

Blesta supports two-factor authentication (in v2.5 and v3) for both TOTP (Time based One Time Password) and MOTP (Mobile One Time Password) for staff users. Both methods use a token, like OATH Token for the iPhone. Staff members log-in by entering their username and password, and are then prompted for their one time password. Once this token is entered, it can never be used again, so a man in the middle attack is not feasible.

I did a video on Staff Login a while back that shows two-factor authentication in action, if you haven’t seen it.

PHPIDS Plugin

Shipping with v3 is a plugin called PHPIDS, which is an intrusion detection system. The plugin is excellent at detecting, logging, and blocking various attacks and uses the PHPIDS library.

From the PHPIDS website:

Currently the PHPIDS detects all sorts of XSS, SQL Injection, header injection, directory traversal, RFE/LFI, DoS and LDAP attacks. Through special conversion algorithms the PHPIDS is even able to detect heavily obfuscated attacks – this covers several charsets like UTF-7, entities of all forms – such as JavaScript Unicode, decimal- and hex-entities as well as comment obfuscation, obfuscation through concatenation, shell code and many other variants.

Furthermore the PHPIDS is able to detect yet unknown attack patterns with the PHPIDS Centrifuge component. This component does in depth string analysis and measurement and detects about 85% to 90% of all tested vectors given a minimum length of 25 characters.

The video is below, as usual you can make the video full screen, and be sure to turn on your sound.

ACL (Access Control List)

v3 introduces a fully featured ACL. Access to different areas and tasks is limited to the group a staff member is part of. For example, a support staff member may only need to have access to support features, and be kept far away from private customer details. You have fine-grained control over what they can and can’t access.

I did a video on this one too, appropriately named Full Featured ACL. It’s worth a watch, if you haven’t seen it.

Extensive Logging

v3 logs a lot of things, including credit card accesses. Anytime a staff member views a credit card number it’s logged. If card numbers are siphoned off, you’ll be able to tell exactly who took them.

Offsite Gateways and Batch Processing

In v3 we are introducing offsite storage of card details for gateways that support it, like Authorize.net’s CIM method. For those using local storage of card numbers they are still encrypted. Now with up to 3072-bit RSA cipher (depending on your system), and you can optionally set a passphrase on them. A passphrase is similar to a password, and is not stored on the server anywhere. Credit card numbers can be encrypted without the passphrase, but the passphrase would be required to decrypt them. When enabled, all payments made from stored card numbers must be batched manually with the passphrase. It’s an added layer of security that can be enabled or disabled anytime. (Just don’t forget the passphrase if you set one!)

minPHP and PDO

The open source PHP framework we wrote, minPHP, provides foundation level security for Blesta v3. minPHP supports, and v3 uses PDO which helps make queries safe and secure through parameter binding. Cody wrote more on this in his article title Eliminating SQL Injection.

Smarty’s not that Smart

Blesta has never used the Smarty template system, and v3 is no different. We rarely trust 3rd party libraries, especially bloated ones with very little benefit. The template system in minPHP is light weight and secure and it has many similarities to the template system we used in previous versions. We feel justified in our approach to keeping things simple and light weight, especially in light of recent security exploits with Smarty that affected at least two of our competitors.

Our strict requirements in terms of integration of 3rd party libraries, and our aversion to bloated code put Blesta on a higher playing field.

In Conclusion

I’m not good at marketing, I’m really not. I tend to think of good marketers as a little dishonest and don’t always hold them in the highest esteem. Their job is to portray their product in the best possible light and at times make it seem better than the competition. I think the product should speak for itself and I am passionate about what we’re doing because I know we are building something great.

Part of what sets us apart from our competition is our desire to do things right, along with our expertise to follow through on that desire. No shortcuts. No compromise. After all, that’s what I would want in a billing system for myself, because, if the focus is right, everything else will fall into place. If not, it’s an exhausting game of cat and mouse and I have no interest in that.

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Blesta 3.0: Eliminating SQL Injection

August 15, 2011 | Posted by Cody


SQL injection is a serious concern for developers, and there are a number of ways of dealing with it; however the best, and most proven method, is through parameter binding. What parameter binding does is substitute variable data within a query with parameters, which are then replaced by the database driver during query execution. Since the database driver is intimately aware of which parts of the query are parameters it can parse the query and then execute it with the bound parameters safely set.

The framework that Blesta 3 is built on, minPHP, handles parameter binding through use of the PDO extension. But because writing queries is tedious and prone to typos, minPHP offers a database access object to interface with PDO in the Record class. A query that would otherwise looks like this…

$this->query("SELECT `users`.`first_name`, `users`.`last_name` FROM `users` WHERE `id`=?", 3);

becomes…

$this->Record->select(array("users.first_name","users.last_name"))->from("users")->where("id", "=", 3);

No need to worry about syntax, semantics, escaping data, or back-ticks. That’s all handled by the computer, which loves performing tedious operations over and over.

We’ll look at how to overcome cross site scripting (XSS) vulnerabilities next week.

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