mcp-server-semgrep/semgrep-rules/scala/scala-jwt/security/jwt-hardcode.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: scala-jwt-hardcoded-secret
  languages:
  - scala
  message: >-
    Hardcoded JWT secret or private key is used.
    This is a Insufficiently Protected Credentials weakness: https://cwe.mitre.org/data/definitions/522.html
    Consider using an appropriate security mechanism to protect the credentials (e.g. keeping secrets
    in environment variables)
  metadata:
    category: security
    cwe:
    - 'CWE-522: Insufficiently Protected Credentials'
    owasp:
    - A02:2017 - Broken Authentication
    - A04:2021 - Insecure Design
    source-rule-url: https://semgrep.dev/blog/2020/hardcoded-secrets-unverified-tokens-and-other-common-jwt-mistakes/
    technology:
    - jwt
    confidence: HIGH
    references:
    - https://owasp.org/Top10/A04_2021-Insecure_Design
    cwe2021-top25: true
    subcategory:
    - audit
    likelihood: MEDIUM
    impact: MEDIUM
  pattern-either:
  - pattern: |
      com.auth0.jwt.algorithms.Algorithm.HMAC256("...");
  - pattern: |
      $SECRET = "...";
      ...
      com.auth0.jwt.algorithms.Algorithm.HMAC256($SECRET);
  - pattern: |
      class $CLASS {
        ...
        $DECL $SECRET = "...";
        ...
        def $FUNC (...): $RETURNTYPE = {
          ...
          com.auth0.jwt.algorithms.Algorithm.HMAC256($SECRET);
          ...
        }
        ...
      }
  - pattern: |
      com.auth0.jwt.algorithms.Algorithm.HMAC384("...");
  - pattern: |
      $SECRET = "...";
      ...
      com.auth0.jwt.algorithms.Algorithm.HMAC384($SECRET);
  - pattern: |
      class $CLASS {
        ...
        $DECL $SECRET = "...";
        ...
        def $FUNC (...): $RETURNTYPE = {
          ...
          com.auth0.jwt.algorithms.Algorithm.HMAC384($SECRET);
          ...
        }
        ...
      }
  - pattern: |
      com.auth0.jwt.algorithms.Algorithm.HMAC512("...");
  - pattern: |
      $SECRET = "...";
      ...
      com.auth0.jwt.algorithms.Algorithm.HMAC512($SECRET);
  - pattern: |
      class $CLASS {
        ...
        $DECL $SECRET = "...";
        ...
        def $FUNC (...): $RETURNTYPE = {
          ...
          com.auth0.jwt.algorithms.Algorithm.HMAC512($SECRET);
          ...
        }
        ...
      }
  severity: ERROR