# CBOM Security and Compliance Rules
# Category: cbom-security, cbom-compliance
# Evaluates cryptographic assets (algorithms, protocols, certificates, related-crypto-material) for weaknesses.

- id: CBS-001
  name: "Weak/Deprecated Cryptographic Algorithm"
  description: "Usage of weak or deprecated cryptographic algorithms such as MD5, SHA-1, RC4, DES, 3DES, or Blowfish exposes data to decryption or collision attacks."
  severity: high
  category: cbom-security
  dry-run-support: full
  standards:
    nist-800-53:
      - "SC-13 Cryptographic Protection"
    iso-27001:
      - "A.8.24 Use of cryptography"
  condition: |
    components[
      cryptoProperties.assetType = 'algorithm'
      and (
        $contains($lowercase($safeStr(cryptoProperties.algorithmProperties.algorithmFamily)), 'md5')
        or $contains($lowercase($safeStr(cryptoProperties.algorithmProperties.algorithmFamily)), 'sha-1')
        or $contains($lowercase($safeStr(cryptoProperties.algorithmProperties.algorithmFamily)), 'sha1')
        or $contains($lowercase($safeStr(cryptoProperties.algorithmProperties.algorithmFamily)), 'rc4')
        or $contains($lowercase($safeStr(cryptoProperties.algorithmProperties.algorithmFamily)), 'des')
        or $contains($lowercase($safeStr(cryptoProperties.algorithmProperties.algorithmFamily)), 'blowfish')
        or $contains($lowercase($safeStr(cryptoProperties.algorithmProperties.algorithmFamily)), 'md4')
        or $contains($lowercase($safeStr(cryptoProperties.algorithmProperties.algorithmFamily)), 'rc2')
      )
    ]
  location: |
    {
      "bomRef": $firstNonEmpty($."bom-ref", bom.serialNumber)
    }
  message: "Weak/Deprecated cryptographic algorithm family '{{ cryptoProperties.algorithmProperties.algorithmFamily }}' detected in component '{{ name }}'"
  mitigation: "Migrate to secure alternatives like SHA-256, SHA-3, or AES-GCM."
  evidence: |
    {
      "algorithmFamily": cryptoProperties.algorithmProperties.algorithmFamily,
      "primitive": cryptoProperties.algorithmProperties.primitive
    }

- id: CBS-002
  name: "Insecure Cipher Mode of Operation"
  description: "Electronic Codebook (ECB) mode lacks cryptographic diffusion and exposes patterns in ciphertext, while Cipher Block Chaining (CBC) without authenticated encryption (AEAD) is vulnerable to padding oracle attacks."
  severity: high
  category: cbom-security
  dry-run-support: full
  standards:
    nist-800-53:
      - "SC-13 Cryptographic Protection"
  condition: |
    components[
      cryptoProperties.assetType = 'algorithm'
      and (
        cryptoProperties.algorithmProperties.mode = 'ecb'
        or (cryptoProperties.algorithmProperties.mode = 'cbc' and cryptoProperties.algorithmProperties.primitive != 'ae')
      )
    ]
  location: |
    {
      "bomRef": $firstNonEmpty($."bom-ref", bom.serialNumber)
    }
  message: "Insecure cipher mode '{{ cryptoProperties.algorithmProperties.mode }}' detected for component '{{ name }}'"
  mitigation: "Use authenticated encryption modes such as GCM or CCM."
  evidence: |
    {
      "algorithmFamily": cryptoProperties.algorithmProperties.algorithmFamily,
      "mode": cryptoProperties.algorithmProperties.mode,
      "primitive": cryptoProperties.algorithmProperties.primitive
    }

- id: CBS-003
  name: "Insufficient Classical Security Level or Key Size"
  description: "Symmetric algorithms with security levels under 128 bits, or asymmetric algorithms (like RSA) with keys under 2048 bits, are vulnerable to brute-force attacks."
  severity: high
  category: cbom-security
  dry-run-support: full
  standards:
    nist-800-53:
      - "SC-13 Cryptographic Protection"
  condition: |
    components[
      (
        cryptoProperties.assetType = 'algorithm'
        and $number(cryptoProperties.algorithmProperties.classicalSecurityLevel) > 0
        and $number(cryptoProperties.algorithmProperties.classicalSecurityLevel) < 128
      )
      or (
        cryptoProperties.assetType = 'related-crypto-material'
        and cryptoProperties.relatedCryptoMaterialProperties.type = 'private-key'
        and $number(cryptoProperties.relatedCryptoMaterialProperties.size) > 0
        and $number(cryptoProperties.relatedCryptoMaterialProperties.size) < 2048
      )
    ]
  location: |
    {
      "bomRef": $firstNonEmpty($."bom-ref", bom.serialNumber)
    }
  message: "Cryptographic strength is insufficient: {{ $firstNonEmpty(cryptoProperties.algorithmProperties.classicalSecurityLevel, cryptoProperties.relatedCryptoMaterialProperties.size) }} bits"
  mitigation: "Upgrade key lengths to at least 128 bits for symmetric keys and 2048 bits (preferably 3072 or 4096 bits) for asymmetric/RSA keys."
  evidence: |
    {
      "assetType": cryptoProperties.assetType,
      "classicalSecurityLevel": cryptoProperties.algorithmProperties.classicalSecurityLevel,
      "keySize": cryptoProperties.relatedCryptoMaterialProperties.size
    }

- id: CBS-004
  name: "Outdated/Insecure Protocol Version"
  description: "Outdated protocols such as SSL v2, SSL v3, TLS 1.0, or TLS 1.1 contain severe vulnerabilities and should be disabled in favor of TLS 1.2 or TLS 1.3."
  severity: critical
  category: cbom-security
  dry-run-support: full
  standards:
    nist-800-53:
      - "SC-8 Transmission Confidentiality and Integrity"
  condition: |
    components[
      cryptoProperties.assetType = 'protocol'
      and (
        cryptoProperties.protocolProperties.type = 'tls' or cryptoProperties.protocolProperties.type = 'dtls'
      )
      and (
        $contains($lowercase($safeStr(cryptoProperties.protocolProperties.version)), '1.0')
        or $contains($lowercase($safeStr(cryptoProperties.protocolProperties.version)), '1.1')
        or $contains($lowercase($safeStr(cryptoProperties.protocolProperties.version)), 'ssl')
        or $contains($lowercase($safeStr(cryptoProperties.protocolProperties.version)), '2.0')
        or $contains($lowercase($safeStr(cryptoProperties.protocolProperties.version)), '3.0')
      )
    ]
  location: |
    {
      "bomRef": $firstNonEmpty($."bom-ref", bom.serialNumber)
    }
  message: "Insecure protocol version '{{ cryptoProperties.protocolProperties.version }}' detected for component '{{ name }}'"
  mitigation: "Require TLS 1.2 or TLS 1.3 as the minimum protocol version."
  evidence: |
    {
      "protocol": cryptoProperties.protocolProperties.type,
      "version": cryptoProperties.protocolProperties.version
    }

- id: CBC-001
  name: "Expired or Expiring Certificate"
  description: "Certificates that have expired or are close to their expiration date will cause service disruptions or trust validation failures."
  severity: high
  category: cbom-compliance
  dry-run-support: full
  condition: |
    components[
      cryptoProperties.assetType = 'certificate'
      and $hasProp($, 'cdx:cert:isExpired', 'true')
    ]
  location: |
    {
      "bomRef": $firstNonEmpty($."bom-ref", bom.serialNumber)
    }
  message: "Certificate for Subject '{{ cryptoProperties.certificateProperties.subjectName }}' has expired or is invalid"
  mitigation: "Renew the certificate and update the deployment trust stores."
  evidence: |
    {
      "subject": cryptoProperties.certificateProperties.subjectName,
      "issuer": cryptoProperties.certificateProperties.issuerName,
      "notValidAfter": cryptoProperties.certificateProperties.notValidAfter
    }