I've been exploring ways to integrate security scanning earlier in our pipeline, and the new Infrastructure as Code scanning plugin for SonarQube caught my eye. We're using Terraform pretty heavily to manage our cloud resources on AWS.
Has anyone installed and configured the IaC plugin for Terraform yet? I'm curious about a few practical things:
* How does it compare to dedicated tools like tfsec or checkov in terms of rule coverage and speed?
* Does it integrate smoothly with pull request decorators, or is it mainly for post-commit analysis?
* What's the setup complexity? Are we talking about just adding the plugin, or do we need to configure specific quality profiles and rules?
I'm trying to decide if it's worth consolidating our Terraform scanning into SonarQube for a unified dashboard, or if we should keep it separate with a specialized tool. Our main goals are catching misconfigurations before deployment and maintaining a single pane of glass for code quality.
We installed the IaC plugin about two months ago across a few of our teams. Short answer: it's not a drop-in replacement for tfsec or checkov, but it does fill a specific niche.
> How does it compare to dedicated tools like tfsec or checkov in terms of rule coverage and speed?
Rule coverage is noticeably narrower. tfsec and checkov both have hundreds of cloud-specific rules (AWS IAM policy checks, S3 bucket encryption, KMS key rotation, etc.) while the SonarQube plugin seems to focus on general Terraform anti-patterns and a smaller subset of the CIS benchmarks. On the speed side, the plugin is slower for large codebases because it runs as part of the full Sonar analysis pipeline. Running tfsec in a separate CI step completes in under 10 seconds for a 50-resource project; the SonarQube scan adds 30-45 seconds on top of the existing analysis. That's not a dealbreaker, but it's measurable.
> Does it integrate smoothly with pull request decorators, or is it mainly for post-commit analysis?
The PR decorator integration works. We have it wired into Azure DevOps via the SonarQube plugin for PR decoration. It posts comments on new issues, which is fine. But the comments are less actionable than what tfsec's SARIF output gives us. tfsec will tell you "this S3 bucket does not have versioning enabled" and link directly to the resource block. The SonarQube plugin sometimes reports at a higher abstraction level -- "unrestricted network access detected" without pinpointing the exact line. We had to add custom quality profiles to suppress some noise.
> What's the setup complexity?
If you already have SonarQube running and a quality profile for your Terraform projects, adding the plugin is just a marketplace install and a restart. The real complexity is in the quality profile tuning. Out of the box, the plugin activates about 40 rules. We found that about 15 of those were redundant with our existing static analysis or too generic (e.g., "use of hardcoded values" triggers on any string that looks like an IP address, even in comments). We ended up disabling about half the rules and writing a few custom ones using the SonarQube rule API. That took a developer a couple of days.
If your goal is a single pane of glass for code quality, the plugin works. But I'd keep tfsec or checkov running in parallel pre-commit as a faster, more detailed gate. The SonarQube plugin is better at catching structural issues (terraform fmt violations, unused variables, deprecated syntax) than security misconfigurations. For AWS-specific hardening, you'll likely still miss things without the dedicated tools.
One caveat: the plugin's handling of Terraform modules is inconsistent. It parses the root module fine, but if you reference external modules it sometimes skips analysis on those. We've had to run `terraform init` before the scan and make sure the `.terraform` directory is accessible. That's a minor annoyance.
What CI platform are you using? That might affect how much effort the PR decoration setup takes.
Data over dogma