By Andy Thurai
Like many other open source models, Hadoop has followed a path that hasn’t focused much on security. In order to effectively use Big Data, it needs to be secured properly. However if you try to force fit into an older security model, you might end up compromising more than you think. But if you make it highly secure, it might interfere with performance.
In order to effectively secure Big Data, you must mitigate the following security risks that aren’t addressed by prior security models.
Issue #1: Are the keys to the kingdom with you?
In a hosted environment, the provider holds the keys to your secure data. If a government agency legally demands access, the providers are obligated to provide access to your data. While it is necessary, the onus should be on you to control when, what, and how much you are giving others access to and also keep track of the information released to facilitate internal auditing processes.
Keep the keys to the kingdom with you. An encryption proxy can provide a tighter control.
Issue#2: Encrypting slows things down
If you encrypt the entire data, it could slow the performance down significantly. In order to avoid that, some of the Big Data, BI, and analytics programs choose to encrypt only portions of sensitive data. It is imperative to use a Big Data eco-system that is intelligent enough to encrypt data selectively.
Issue #3: Identifiable, sensitive data is a big risk
Sensitive data can be classified into two groups: Risk or Compliance. Safeguarding your data might include one of the following:
- Completely redact this information so you can never get the original information back. While this is the most effective method, it would be difficult to get the original data back if needed.
- Tokenize the sensitive data using proxy tokenization solution. You can create a completely random token that can be made to look like the original data to fit the format so it won’t break the backend systems. The sensitive data can be stored in a secure vault and only associated tokens can be distributed.
- Encrypt the sensitive data using mechanisms such as Format Preserving Encryption (FPE) so the output encrypted data fits the format of the original data. Care should be exercised in selecting a solution to make sure the solution has strong key management & strong encryption capabilities.
Issue #4: Data and access control properties together
If you let applications/services access the raw data that could be disastrous. Instead, you might want to enforce the data access controls, as close to the data as possible. You need to distribute data, associated properties, classification levels, and enforce them where the data is. One way to enforce this would be to have an API expose data that can control the exposure based on data attributes locally.
Issue #5: Protect the exposure APIs
Many of the Big Data components communicate via APIs (i.e. HDFS, HBase, and HCatalog). When you allow such powerful APIs to be exposed with very little, or no protection, it could lead to disastrous results. The most effective way to protect your Big Data goldmine would be to introduce a touchless API security Gateway in front of the Hadoop clusters. The clusters can be made to trust calls ONLY from the secure gateway. By choosing a hardened Big Data security gateway you can enforce all of the above by using very rich authentication and authorization schemes.
Issue #6: Name node protection
This issue is important enough for me to call this out as a separate issue. This arises from the architectural perspective that, if no proper resource protection is enforced, the NameNode can become the single point of failure making the entire Hadoop cluster useless. It is as easy as someone launching a DOS attack against webHDFS by producing excessive activity that can bring webHDFS down.
Issue #7: Identify, Authenticate, Authorize and control the data access
You need to have an effective Identity Management and Access control system in place to make this happen. You also need to identify the user base and effectively control access to the data consistently based on access control policies without relying on an additional identity silos. Ideally, authentication and authorization for Hadoop should leverage existing identity management investments. The enforcement should also take into account the time based restrictions as well (such as certain users can access certain data only during specific periods, etc.).
Issue #8: Monitor, Log and analyze the usage patterns
Once you have implemented an effective data access controls based classification, you also need to monitor and log the usage patterns. You need to constantly analyze the usage patterns to make sure that there is no unusual activity. It is very crucial to catch an unusual activity and access-pattern early enough so you can avoid dumps of data making it out of your repository to a hacker.
As more and more organizations are rushing to implement and utilize the power of Big Data, care should be exercised to secure Big Data. Extending the existing security models to fit Big Data may not solve the problem; as a matter of fact it might introduce additional performance issues as discussed above. A solid security framework needs to be thought out before organizations can adopt enterprise grade Big Data.