Semgrep pre-commit hook

Co-authored-by: Dániel Kántor <[email protected]>

rule-types/github/semgrep_secrets_scanning.test.yaml

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+tests:
+  - name: "Should have Semgrep pre-commit hook configured"
+    def: {}
+    params: {}
+    expect: "pass"
+    git:
+      repo_base: correct
+  - name: "Should fail Semgrep pre-commit hook is not configured"
+    def: {}
+    params: {}
+    expect: "fail"
+    git:
+      repo_base: misconfigured

rule-types/github/semgrep_secrets_scanning.testdata/correct/.pre-commit-config.yaml

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+repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v3.2.0
+    hooks:
+    -   id: trailing-whitespace
+    -   id: end-of-file-fixer
+    -   id: check-yaml
+    -   id: check-added-large-files
+        args: ['--maxkb=600']
+-   repo: https://github.com/semgrep/pre-commit
+    rev: 'v1.101.0'
+    hooks:
+      - id: semgrep

rule-types/github/semgrep_secrets_scanning.testdata/misconfigured/.pre-commit-config.yaml

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+repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v3.2.0
+    hooks:
+    -   id: trailing-whitespace
+    -   id: end-of-file-fixer
+    -   id: check-yaml
+    -   id: check-added-large-files
+        args: ['--maxkb=600']

rule-types/github/semgrep_secrets_scanning.yaml

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+---
+version: v1
+release_phase: alpha
+type: rule-type
+name: semgrep_secrets_scanning
+display_name: Enable Semgrep Pre-commit hooks for detecting secrets
+short_failure_message: Semgrep Pre-commit hook is not configured for the repository
+severity:
+  value: medium
+context: {}
+description: |
+  Verifies that Semgrep Pre-commit hook is configured via a GitHub action for the repository, and remediate
+guidance: |
+  Likewise, you can configure a hook to run a semgrep scan with the semgrep hook. As an example, the following configuration would scan the files to be committed with a specified config, skipping files with unknown extensions.
+  For more information, see the [Semgrep Pre-commit](https://semgrep.dev/docs/secure-guardrails/secure-guardrails-in-semgrep) documentation.
+def:
+  in_entity: repository
+  rule_schema:
+    type: object
+    properties: {}
+  ingest:
+    type: git
+    git: {}
+  eval:
+    type: rego
+    rego:
+      type: deny-by-default
+      def: |
+        package minder
+        import future.keywords.if
+        import future.keywords.every
+
+        default message := "Semgrep pre-commit hook is not configured for the repository"
+        default allow := false
+
+        
+        # pre-commit hook
+        precommit := file.read(".pre-commit-config.yaml")
+        
+        parsed_data := parse_yaml(precommit)
+
+        allow if {
+          some repo_id, hook_id
+          repo_data := parsed_data.repos[repo_id]
+          endswith(repo_data["repo"], "https://github.com/semgrep/pre-commit")
+          semgrep_hooks = repo_data["hooks"]
+          semgrep_hooks[hook_id].id == "semgrep"
+        }
+
+        message := "" if allow
+  alert:
+    type: security_advisory
+    security_advisory: {}