196 lines
7.3 KiB
Python
196 lines
7.3 KiB
Python
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from OpenSSL.crypto import load_certificate, load_privatekey, \
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dump_certificate, dump_privatekey, \
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PKey, X509, X509Extension, \
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TYPE_RSA, FILETYPE_PEM
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from os import makedirs, unlink, listdir
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from os.path import join, isdir, isfile
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from datetime import datetime
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PKI_DIR = '/srv/tls/x509/autosign'
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def autosign_certif(cn,
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authority_cn,
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authority_name,
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type_,
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config,
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):
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ca_name = gen_chain(cn,
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authority_cn,
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authority_name,
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config,
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)
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cert_name, key_name = gen_certificate(cn,
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authority_cn,
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authority_name,
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type_,
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config,
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)
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return ca_name, cert_name, key_name
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def gen_chain(cn: str,
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authority_cn: str,
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authority_name: str,
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config,
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):
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week_number = datetime.now().isocalendar().week
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root_dir_name = join(PKI_DIR, authority_cn)
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ca_dir_name = join(root_dir_name, 'ca')
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key_ca_name = join(ca_dir_name, 'private.key')
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cert_ca_name = f'certificate_{week_number}.crt'
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cert_ca_filename = join(ca_dir_name, cert_ca_name)
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local_ca_dir_name = join(root_dir_name, 'certificats', cn, 'ca')
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if not isfile(cert_ca_filename):
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if not isdir(ca_dir_name):
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makedirs(ca_dir_name)
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_gen_cert(True,
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[authority_cn],
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root_dir_name,
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key_ca_name,
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cert_ca_filename,
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config,
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)
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for filename in listdir(ca_dir_name):
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if not filename.endswith('.crt') or filename == cert_ca_name:
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continue
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unlink(join(ca_dir_name, filename))
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return cert_ca_filename
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def _gen_cert(is_ca,
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common_names,
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root_dir_name,
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key_file,
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cert_file,
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config,
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type=None,
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ca_cert=None,
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ca_key=None,
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):
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validity_end_in_seconds = 10*24*60*60
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email_address = config['email']
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country_name = config['country']
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locality_name = config['locality']
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state_or_province_name = config['state']
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organization_name = config['org_name']
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organization_unit_name = config['org_unit_name']
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#can look at generated file using openssl:
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#openssl x509 -inform pem -in selfsigned.crt -noout -text
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# create a key pair
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if isfile(key_file):
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with open(key_file) as fh:
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filecontent = bytes(fh.read(), 'utf-8')
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key = load_privatekey(FILETYPE_PEM, filecontent)
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else:
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key = _gen_key_pair()
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cert = X509()
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cert.set_version(2)
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cert.get_subject().C = country_name
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cert.get_subject().ST = state_or_province_name
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cert.get_subject().L = locality_name
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cert.get_subject().O = organization_name
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cert.get_subject().OU = organization_unit_name
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cert.get_subject().CN = common_names[0]
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cert.get_subject().emailAddress = email_address
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cert_ext = []
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if not is_ca:
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cert_ext.append(X509Extension(b'basicConstraints', False, b'CA:FALSE'))
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cert_ext.append(X509Extension(b'keyUsage', True, b'digitalSignature, keyEncipherment'))
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cert_ext.append(X509Extension(b'subjectAltName', False, ", ".join([f'DNS:{common_name}' for common_name in common_names]).encode('ascii')))
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if type == 'server':
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cert_ext.append(X509Extension(b'extendedKeyUsage', True, b'serverAuth'))
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else:
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cert_ext.append(X509Extension(b'extendedKeyUsage', True, b'clientAuth'))
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else:
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cert_ext.append(X509Extension(b'basicConstraints', False, b'CA:TRUE'))
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cert_ext.append(X509Extension(b"keyUsage", True, b'keyCertSign, cRLSign'))
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cert_ext.append(X509Extension(b'subjectAltName', False, f'email:{email_address}'.encode()))
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cert_ext.append(X509Extension(b'subjectKeyIdentifier', False, b"hash", subject=cert))
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cert.add_extensions(cert_ext)
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sn_filename = join(root_dir_name, 'serial_number')
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if isfile(sn_filename):
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with open(sn_filename, 'r') as fh:
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serial_number = int(fh.read().strip()) + 1
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else:
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serial_number = 0
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cert.set_serial_number(serial_number)
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with open(sn_filename, 'w') as fh:
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fh.write(str(serial_number))
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cert.gmtime_adj_notBefore(0)
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cert.gmtime_adj_notAfter(validity_end_in_seconds)
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if is_ca:
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ca_cert = cert
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ca_key = key
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else:
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with open(ca_cert) as fh:
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filecontent = bytes(fh.read(), 'utf-8')
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ca_cert = load_certificate(FILETYPE_PEM, filecontent)
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with open(ca_key) as fh:
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filecontent = bytes(fh.read(), 'utf-8')
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ca_key = load_privatekey(FILETYPE_PEM, filecontent)
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cert.set_issuer(ca_cert.get_subject())
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cert.add_extensions([X509Extension(b"authorityKeyIdentifier", False, b'keyid:always', issuer=ca_cert)])
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cert.set_pubkey(key)
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cert.sign(ca_key, "sha512")
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with open(cert_file, "wt") as f:
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f.write(dump_certificate(FILETYPE_PEM, cert).decode("utf-8"))
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if not is_ca:
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f.write(dump_certificate(FILETYPE_PEM, ca_cert).decode("utf-8"))
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with open(key_file, "wt") as f:
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f.write(dump_privatekey(FILETYPE_PEM, key).decode("utf-8"))
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def _gen_key_pair():
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key = PKey()
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key.generate_key(TYPE_RSA, 4096)
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return key
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def gen_certificate(cn,
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authority_cn,
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authority_name,
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type,
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config,
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):
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root_cert_dir_name = join(PKI_DIR, authority_cn, 'certificats', cn)
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week_number = datetime.now().isocalendar().week
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root_dir_name = join(PKI_DIR, authority_cn)
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ca_dir_name = join(root_dir_name, 'ca')
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key_ca_name = join(ca_dir_name, 'private.key')
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certificate_name = f'certificate_{week_number}.crt'
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cert_ca_name = join(ca_dir_name, certificate_name)
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cert_ca_external_name = join(root_cert_dir_name, 'ca', certificate_name)
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dir_name = join(root_cert_dir_name, type)
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key_name = join(dir_name, f'private.key')
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cert_name = join(dir_name, certificate_name)
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external = False
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if isfile(cert_ca_external_name):
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external = True
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elif not isfile(cert_ca_name):
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raise Exception(f'cannot find CA file "{cert_ca_name}" for "{cn}"')
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if not isfile(cert_name):
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if external:
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raise Exception(f"cannot find CA private key (\"{authority_cn}\") to sign certificat for \"{cn}\" ({key_ca_name}), is it sign with external authority (like Let's Encrypt certification)?")
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if not isdir(dir_name):
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makedirs(dir_name)
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common_names = [cn]
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_gen_cert(False,
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common_names,
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root_dir_name,
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key_name,
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cert_name,
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config,
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ca_cert=cert_ca_name,
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ca_key=key_ca_name,
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type=type,
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)
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for filename in listdir(dir_name):
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if not filename.endswith('.crt') or filename == certificate_name:
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continue
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unlink(join(dir_name, filename))
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return cert_name, key_name
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