terrascan

terrascan documentation

Version in MegaLinter: 1.18.11
Visit Official Web Site
See How to configure terrascan rules
See Index of problems detected by terrascan

Configuration in MegaLinter

Enable terrascan by adding TERRAFORM_TERRASCAN in ENABLE_LINTERS variable
Disable terrascan by adding TERRAFORM_TERRASCAN in DISABLE_LINTERS variable

Variable	Description	Default value
TERRAFORM_TERRASCAN_ARGUMENTS	User custom arguments to add in linter CLI call Ex: `-s --foo "bar"`
TERRAFORM_TERRASCAN_COMMAND_REMOVE_ARGUMENTS	User custom arguments to remove from command line before calling the linter Ex: `-s --foo "bar"`
TERRAFORM_TERRASCAN_FILE_EXTENSIONS	Allowed file extensions. `"*"` matches any extension, `""` matches empty extension. Empty list excludes all files Ex: `[".py", ""]`	`[".tf"]`
TERRAFORM_TERRASCAN_FILE_NAMES_REGEX	File name regex filters. Regular expression list for filtering files by their base names using regex full match. Empty list includes all files Ex: `["Dockerfile(-.+)?", "Jenkinsfile"]`	Include every file
TERRAFORM_TERRASCAN_PRE_COMMANDS	List of bash commands to run before the linter	None
TERRAFORM_TERRASCAN_POST_COMMANDS	List of bash commands to run after the linter	None
TERRAFORM_TERRASCAN_UNSECURED_ENV_VARIABLES	List of env variables explicitly not filtered before calling TERRAFORM_TERRASCAN and its pre/post commands	None
TERRAFORM_TERRASCAN_CONFIG_FILE	terrascan configuration file nameUse `LINTER_DEFAULT` to let the linter find it	`terrascan-config.toml`
TERRAFORM_TERRASCAN_RULES_PATH	Path where to find linter configuration file	Workspace folder, then MegaLinter default rules
TERRAFORM_TERRASCAN_DISABLE_ERRORS	Run linter but consider errors as warnings	`false`
TERRAFORM_TERRASCAN_DISABLE_ERRORS_IF_LESS_THAN	Maximum number of errors allowed	`0`
TERRAFORM_TERRASCAN_CLI_EXECUTABLE	Override CLI executable	`['terrascan']`

MegaLinter Flavours

This linter is available in the following flavours

Flavor	Description	Embedded linters
all	Default MegaLinter Flavor	125
cupcake	MegaLinter for the most commonly used languages	84
security	Optimized for security	24
terraform	Optimized for TERRAFORM based projects	56

Behind the scenes

How are identified applicable files

File extensions: .tf

How the linting is performed

terrascan is called once on the whole project directory (project CLI lint mode)

filtering can not be done using MegaLinter configuration variables,it must be done using terrascan configuration or ignore file (if existing)
VALIDATE_ALL_CODEBASE: false doesn't make terrascan analyze only updated files

Example calls

terrascan scan -i terraform -t all -f myfile.tf

Help content

Terrascan

Detect compliance and security violations across Infrastructure as Code to mitigate risk before provisioning cloud native infrastructure.
For more information, please visit https://runterrascan.io/

Usage:
  terrascan [command]

Available Commands:
  init        Initializes Terrascan and clones policies from the Terrascan GitHub repository.
  scan        Detect compliance and security violations across Infrastructure as Code.
  server      Run Terrascan as an API server
  version     Terrascan version

Flags:
  -c, --config-path string      config file path
  -l, --log-level string        log level (debug, info, warn, error, panic, fatal) (default "info")
      --log-output-dir string   directory path to write the log and output files
  -x, --log-type string         log output type (console, json) (default "console")
  -o, --output string           output type (human, json, yaml, xml, junit-xml, sarif, github-sarif) (default "human")
      --temp-dir string         temporary directory path to download remote repository,module and templates

Use "terrascan [command] --help" for more information about a command.

Installation on mega-linter Docker image

Dockerfile commands :

# renovate: datasource=docker depName=alpine/terragrunt
ARG TERRAFORM_TERRASCAN_VERSION=1.18.11
FROM tenable/terrascan:${TERRAFORM_TERRASCAN_VERSION} as terrascan
COPY --link --from=terrascan /go/bin/terrascan /usr/bin/