GenerateCSR

Source

import demistomock as demisto
from CommonServerPython import *
from cryptography import x509
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import rsa


def main():
    try:
        # Generate a key
        key = rsa.generate_private_key(public_exponent=65537, key_size=2048, backend=default_backend())

        toWarRoom = demisto.getArg("OutputToWarRoom")
        cn = demisto.getArg("cn")
        email = demisto.getArg("email")
        organization = demisto.getArg("org")
        organizational_unit = demisto.getArg("orgUnit")
        country = demisto.getArg("country")
        state = demisto.getArg("state")
        locality = demisto.getArg("locality")

        cert_attributes = [x509.NameAttribute(x509.OID_COMMON_NAME, cn)]

        # Generate the CSR
        builder = x509.CertificateSigningRequestBuilder()

        # Build CSR Attributes for CertificateSigningRequestBuilder Object
        if email:
            cert_attributes.append(x509.NameAttribute(x509.OID_EMAIL_ADDRESS, email))

        if organization:
            cert_attributes.append(x509.NameAttribute(x509.OID_ORGANIZATION_NAME, organization))

        if organizational_unit:
            cert_attributes.append(x509.NameAttribute(x509.OID_ORGANIZATIONAL_UNIT_NAME, organizational_unit))

        if country:
            cert_attributes.append(x509.NameAttribute(x509.OID_COUNTRY_NAME, country))

        if state:
            cert_attributes.append(x509.NameAttribute(x509.OID_STATE_OR_PROVINCE_NAME, state))

        if locality:
            cert_attributes.append(x509.NameAttribute(x509.OID_LOCALITY_NAME, locality))

        builder = builder.subject_name(x509.Name(cert_attributes))

        builder = builder.add_extension(x509.BasicConstraints(ca=False, path_length=None), critical=False)

        csr = builder.sign(key, hashes.SHA256(), default_backend())

        pem_req = csr.public_bytes(serialization.Encoding.PEM)

        pem_text = pem_req.decode("utf8")

        results = [
            fileResult(filename="request.csr", data=pem_text),
        ]

        if toWarRoom == "True":
            results.append(pem_text)

        return_results(results)

    except Exception as ex:
        return_error(f"An Error occured: {ex}", error=ex)


""" ENTRY POINT """

if __name__ in ("__main__", "__builtin__", "builtins"):
    main()

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