Intermediate CA certificate template

Example:

{
  "key_gen": {
    "enabled": true,
    "key_type": {
      "allowed_types": [
        "rsa",
        "ecdsa",
        "Ed25519"
      ],
      "default_key_type":"rsa"
    },
    "rsa_key_size": {
      "min_bits": 2048,
      "max_bits": 4096,
      "default_bits": 2048
    },
    "ecdsa_curve": {
      "allowed_curves": [
        "P-256",
        "P-384",
        "P-521"
      ],
      "default_curve":"P-256"
    }
  },
  "issue_types": [
    "client_authentication",
    "server_authentication",
    "private_smime"
  ],
  "signature_algorithm": {
    "allowed_algorithms": [
      "sha1WithRSA",
      "sha256WithRSA",
      "sha384WithRSA",
      "sha512WithRSA",
      "sha256WithECDSA",
      "sha384WithECDSA",
      "sha512WithECDSA",
      "match_issuer"
    ],
    "default_algorithm": "match_issuer"
  },
  "subject": {
    "attributes": [
      {
        "type": "common_name",
        "include": "optional",
        "encoding": "auto",
        "allowed_source": [
          "csr",
          "fixed_value",
          "user_supplied"
        ]
      },
      {
        "type": "organization_name",
        "include": "optional",
        "encoding": "auto",
        "allowed_source": [
          "csr",
          "fixed_value",
          "user_supplied"
        ]
      },
      {
        "type": "organization_unit",
        "include": "optional",
        "encoding": "auto",
        "allowed_source": [
          "csr",
          "fixed_value",
          "user_supplied"
        ]
      },
      {
        "type": "street_address",
        "include": "optional",
        "encoding": "auto",
        "allowed_source": [
          "csr",
          "fixed_value",
          "user_supplied"
        ]
      },
      {
        "type": "postal_code",
        "include": "optional",
        "encoding": "auto",
        "allowed_source": [
          "csr",
          "fixed_value",
          "user_supplied"
        ]
      },
      {
        "type": "locality",
        "include": "optional",
        "encoding": "auto",
        "allowed_source": [
          "csr",
          "fixed_value",
          "user_supplied"
        ]
      },
      {
        "type": "state",
        "include": "optional",
        "encoding": "auto",
        "allowed_source": [
          "csr",
          "fixed_value",
          "user_supplied"
        ]
      },
      {
        "type": "country",
        "include": "optional",
        "encoding": "auto",
        "allowed_source": [
          "csr",
          "fixed_value",
          "user_supplied"
        ]
      }
    ]
  },
  "extensions": {
    "extended_key_usage": {
      "critical": false,
      "required_usages": [
        {
          "oid": "server_authentication",
          "name": ""
        }
      ],
      "optional_usages": [
        {
          "oid": "client_authentication",
          "name": ""
        }
      ]
    },
    "san": {
      "critical": false,
      "dns_name": {
        "include": "no",
        "auto_include_cn": "no",
        "allowed_source": [
          "csr",
          "fixed_value",
          "user_supplied"
        ]
      }
    },
    "basic_constraints": {
      "ca": true
    }
  },
  "renewal_settings": {
    "renew_valid_cert": "anytime",
    "renew_expired_cert": "anytime",
    "renew_revoked_cert": false,
    "renewal_key_pair": "optional",
    "allow_override_renewal_key_pair": true
  },
  "serial_number_size": 20,
  "validity": {
    "min_duration": {
      "value": 1,
      "unit": "years"
    },
    "max_duration": {
      "value": 10,
      "unit": "years"
    },
    "default_duration": {
      "value": 1,
      "unit": "years"
    }
  }
}