mcp-server-semgrep/semgrep-rules/go/lang/security/audit/crypto/tls.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: tls-with-insecure-cipher
  message: >-
    Detected an insecure CipherSuite via the 'tls' module. This suite is considered
    weak.
    Use the function 'tls.CipherSuites()' to get a list of good cipher suites.
    See https://golang.org/pkg/crypto/tls/#InsecureCipherSuites
    for why and what other cipher suites to use.
  metadata:
    cwe:
    - 'CWE-327: Use of a Broken or Risky Cryptographic Algorithm'
    owasp:
    - A03:2017 - Sensitive Data Exposure
    - A02:2021 - Cryptographic Failures
    source-rule-url: https://github.com/securego/gosec/blob/master/rules/tls.go
    references:
    - https://golang.org/pkg/crypto/tls/#InsecureCipherSuites
    category: security
    technology:
    - go
    confidence: HIGH
    subcategory:
    - vuln
    likelihood: HIGH
    impact: LOW
  languages: [go]
  severity: WARNING
  pattern-either:
  - pattern: |
      tls.Config{..., CipherSuites: []$TYPE{..., tls.TLS_RSA_WITH_RC4_128_SHA, ...}}
  - pattern: |
      tls.Config{..., CipherSuites: []$TYPE{..., tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA, ...}}
  - pattern: |
      tls.Config{..., CipherSuites: []$TYPE{..., tls.TLS_RSA_WITH_AES_128_CBC_SHA256, ...}}
  - pattern: |
      tls.Config{..., CipherSuites: []$TYPE{..., tls.TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, ...}}
  - pattern: |
      tls.Config{..., CipherSuites: []$TYPE{..., tls.TLS_ECDHE_RSA_WITH_RC4_128_SHA, ...}}
  - pattern: |
      tls.Config{..., CipherSuites: []$TYPE{..., tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, ...}}
  - pattern: |
      tls.Config{..., CipherSuites: []$TYPE{..., tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, ...}}
  - pattern: |
      tls.Config{..., CipherSuites: []$TYPE{..., tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256, ...}}
  - pattern: |
      tls.CipherSuite{..., TLS_RSA_WITH_RC4_128_SHA, ...}
  - pattern: |
      tls.CipherSuite{..., TLS_RSA_WITH_3DES_EDE_CBC_SHA, ...}
  - pattern: |
      tls.CipherSuite{..., TLS_RSA_WITH_AES_128_CBC_SHA256, ...}
  - pattern: |
      tls.CipherSuite{..., TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, ...}
  - pattern: |
      tls.CipherSuite{..., TLS_ECDHE_RSA_WITH_RC4_128_SHA, ...}
  - pattern: |
      tls.CipherSuite{..., TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, ...}
  - pattern: |
      tls.CipherSuite{..., TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, ...}
  - pattern: |
      tls.CipherSuite{..., TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256, ...}