339 Zeilen
14 KiB
Python
Ausführbare Datei
339 Zeilen
14 KiB
Python
Ausführbare Datei
#!/usr/bin/python3
|
|
import argparse
|
|
import sqlite3
|
|
from cryptography import x509
|
|
from cryptography.hazmat.primitives.asymmetric import rsa
|
|
from cryptography.hazmat.backends import default_backend
|
|
from cryptography.hazmat.primitives import hashes
|
|
from cryptography.hazmat.primitives.serialization import PrivateFormat, NoEncryption, BestAvailableEncryption, load_pem_private_key
|
|
from cryptography.x509.oid import NameOID
|
|
from cryptography.hazmat.primitives.serialization import Encoding
|
|
from concurrent.futures import ThreadPoolExecutor
|
|
import datetime
|
|
|
|
|
|
def parser_factory():
|
|
parser = argparse.ArgumentParser(description="Programm zur Administration von Zertifikaten")
|
|
parser.add_argument("--db", type=str, help="Datenbank die benutzt wird.", default="certificates.sqlite3")
|
|
subparser = parser.add_subparsers(dest="aktion", title="Kommandos", )
|
|
newca = subparser.add_parser("newca", help="erstellt ein neues CA-Zertifikat")
|
|
request = subparser.add_parser("request", help="erstellt eine Zertifikatsanfrage")
|
|
sign = subparser.add_parser("sign", help="TBI Signiert eine Zertifikatsanfrage")
|
|
config = subparser.add_parser("config", help="TBI")
|
|
for kommando in [ newca, request]:
|
|
kommando.add_argument("--length", type=int, help="Schlüssellänge des Zertifikats, sollte ein Exponent von 2 und größer als 1024 sein", default=4096, dest="länge")
|
|
kommando.add_argument("--commonname", type=str, help="Name des Besitzers", required=True, dest="cn")
|
|
kommando.add_argument("--location", help="Stadt", dest="l")
|
|
kommando.add_argument("--state", help="Bundesland/Kanton", dest="st")
|
|
kommando.add_argument("--organization", help="Firma", dest="o")
|
|
kommando.add_argument("--ou", help="Abteilung", dest="ou")
|
|
kommando.add_argument("--country", help="Land", dest="c")
|
|
kommando.add_argument("--street", help="Straße", dest="street")
|
|
request.add_argument(
|
|
"--san",
|
|
help="Alternativer Name für die Resource, kann eine Emailadresse, URI oder eine Domain sein. sonderzeichen in Domains sollten bereits mittels IDNA umkodiert worden sein.",
|
|
action="append",
|
|
dest="san",
|
|
nargs="?",
|
|
)
|
|
request.add_argument("-s", dest="server", action="store_true", help="Serverzertifikat")
|
|
request.add_argument("-cl", dest="client", action="store_true", help="Clientzertifikat")
|
|
request.add_argument("-co", dest="code", action="store_true", help="Codesignaturzertifikat")
|
|
request.add_argument("-e", dest="email", action="store_true", help="Emailzertifikat")
|
|
request.add_argument("--ca", dest="ca", help="Certificate Authority, Zertifizierungstelle mit optionaler Pfadlänge", nargs="?", type=int)
|
|
newca.add_argument("tage", type=int, help="Tage die das Zertifikat gültig ist")
|
|
return parser
|
|
|
|
def initdb(cursor):
|
|
cursor.execute("CREATE TABLE IF NOT EXISTS \"certificates\" ( `commonname` TEXT NOT NULL, `serial` TEXT NOT NULL UNIQUE, `publickey` TEXT NOT NULL, `privatkey` TEXT NOT NULL UNIQUE, `parent` integer, `ca` INTEGER NOT NULL, PRIMARY KEY(`commonname`), FOREIGN KEY(`parent`) REFERENCES `certificates`(`serial`) ) WITHOUT ROWID")
|
|
cursor.execute("CREATE TABLE IF NOT EXISTS \"requests\" ( `commonname` TEXT NOT NULL, `csr` TEXT NOT NULL UNIQUE, `privatkey` TEXT NOT NULL, PRIMARY KEY(`commonname`) )")
|
|
|
|
def print_wrp(text):
|
|
def wrapper(*t):
|
|
print(text)
|
|
return wrapper
|
|
|
|
def str_exttype(exttype):
|
|
if isinstance(exttype, x509.BasicConstraints):
|
|
if not exttype.ca:
|
|
return "Keine CA"
|
|
if exttype.path_length in [None, 0]:
|
|
return "CA, unendliche Pfadlänge"
|
|
return "CA, Pfadlänge {}".format(exttype.path_length)
|
|
elif isinstance(exttype, x509.ExtendedKeyUsage):
|
|
text = ""
|
|
for usage in exttype:
|
|
text += usage._name + ", "
|
|
return text[:-2]
|
|
elif isinstance(exttype, x509.SubjectAlternativeName):
|
|
text = ""
|
|
for an in exttype._general_names:
|
|
text += an._value + ", "
|
|
return text[:-2]
|
|
else:
|
|
return repr(exttype)
|
|
|
|
def print_info(cert):
|
|
for name in cert.subject.rdns:
|
|
for oid in name:
|
|
print("{}: {}".format(oid._oid._name, oid.value))
|
|
for extension in cert.extensions:
|
|
kritisch = "kritisch"
|
|
if not extension.critical:
|
|
kritisch = "nicht" + kritisch
|
|
print("{}({}): {}".format(extension.oid._name, kritisch, str_exttype(extension.value)))
|
|
|
|
class Certwrapper:
|
|
def __init__(self, backend):
|
|
self.threads = ThreadPoolExecutor(3, "cryptoops")
|
|
self.anfragetemplate = x509.CertificateSigningRequestBuilder()
|
|
self.backend = backend
|
|
|
|
def gencert(self, länge):
|
|
return self.threads.submit(rsa.generate_private_key, 65537, länge, self.backend)
|
|
|
|
def sign(self, subject, issuer, time_valid, public_key, privat_ca_key, extensions=None, ca_key=None):
|
|
if not extensions:
|
|
extensions = []
|
|
builder = x509.CertificateBuilder()
|
|
jetzt = datetime.datetime.now()
|
|
builder = builder.serial_number(x509.random_serial_number())
|
|
builder = builder.not_valid_before(jetzt)
|
|
builder = builder.not_valid_after(jetzt + time_valid)
|
|
builder = builder.subject_name(subject)
|
|
builder = builder.issuer_name(issuer)
|
|
builder = builder.public_key(public_key)
|
|
for extension in extensions:
|
|
builder = builder.add_extension(extension, True)
|
|
if ca_key:
|
|
builder = builder.add_extension(x509.AuthorityKeyIdentifier(ca_key.fingerprint(hashes.SHA512()), None, None), True)
|
|
return builder.sign(privat_ca_key, hashes.SHA512(), self.backend)
|
|
|
|
def request(self, subject, erweiterungen=[], certlänge=4096):
|
|
cert = self.gencert(certlänge)
|
|
anfrage = self.anfragetemplate.subject_name(subject)
|
|
for erweiterung in erweiterungen:
|
|
anfrage = anfrage.add_extension(erweiterung, True)
|
|
anfrage = anfrage.sign(cert.result(), hashes.SHA512(), self.backend)
|
|
return {
|
|
"privat": cert.result(),
|
|
"csr": anfrage
|
|
}
|
|
|
|
|
|
class DBbackend:
|
|
def __init__(self, connection):
|
|
self.connection = connection
|
|
|
|
def insert_certificate(self, commonname: str, serial, publickey, privatkey, ca: bool):
|
|
self.connection.execute(
|
|
"INSERT INTO `certificates`(commonname, serial, publickey, privatkey, ca) VALUES (?, ?, ?, ?, ?)",
|
|
(
|
|
commonname,
|
|
serial,
|
|
publickey,
|
|
privatkey,
|
|
ca
|
|
)
|
|
)
|
|
self.connection.commit()
|
|
|
|
def insert_request(self, commonname, cst, privatkey):
|
|
self.connection.execute(
|
|
"INSERT INTO `requests`(commonname, csr, privatkey) VALUES (?, ?, ?)",
|
|
(
|
|
commonname,
|
|
csr,
|
|
privatkey,
|
|
)
|
|
)
|
|
self.connection.commit()
|
|
|
|
|
|
class Commands:
|
|
def __init__(self, backend, connection, args):
|
|
self.backend = backend
|
|
self.threads = ThreadPoolExecutor(3, "cryptoops")
|
|
self.connection = connection
|
|
self.connection.row_factory = sqlite3.Row
|
|
self.cursor = connection.cursor()
|
|
self.arguments = args
|
|
self.wrapper = Certwrapper(backend)
|
|
self.db = DBbackend(connection)
|
|
|
|
def get(self, name):
|
|
try:
|
|
return self.__getattribute__(name)
|
|
except (AttributeError, TypeError):
|
|
return None
|
|
|
|
def fragen(self, fragen, typ=tuple):
|
|
antworten = []
|
|
for id in fragen:
|
|
antworten.append(typ(id, self.frage(fragen[id], False)))
|
|
return antworten
|
|
|
|
def frage(self, text, typ=str):
|
|
while True:
|
|
antwort = input("{}: ".format(text))
|
|
try:
|
|
return typ(antwort)
|
|
except TypeError:
|
|
print("Falsche Eingabe")
|
|
continue
|
|
|
|
def parsedn(self, dn):
|
|
namen = []
|
|
if dn.cn:
|
|
namen.append(x509.NameAttribute(x509.NameOID.COMMON_NAME, dn.cn))
|
|
if dn.st:
|
|
namen.append(x509.NameAttribute(x509.NameOID.STATE_OR_PROVINCE_NAME, dn.st))
|
|
if dn.l:
|
|
namen.append(x509.NameAttribute(x509.NameOID.LOCALITY_NAME, dn.l))
|
|
if dn.o:
|
|
namen.append(x509.NameAttribute(x509.NameOID.ORGANIZATION_NAME, dn.o))
|
|
if dn.ou:
|
|
namen.append(x509.NameAttribute(x509.NameOID.ORGANIZATIONAL_UNIT_NAME, dn.ou))
|
|
if dn.c:
|
|
namen.append(x509.NameAttribute(x509.NameOID.COUNTRY_NAME, dn.c))
|
|
if dn.street:
|
|
namen.append(x509.NameAttribute(x509.NameOID.STREET_ADDRESS, dn.street))
|
|
return namen
|
|
|
|
def newca(self):
|
|
privater = self.wrapper.gencert(self.arguments.länge)
|
|
jetzt = datetime.datetime.now()
|
|
privater.add_done_callback(print_wrp("Privater Schlüssel generiert"))
|
|
subject = x509.Name(self.parsedn(self.arguments))
|
|
zertifikat = self.wrapper.sign(
|
|
subject=subject,
|
|
issuer=subject,
|
|
time_valid=datetime.timedelta(days=self.arguments.tage),
|
|
public_key=privater.result().public_key(),
|
|
privat_ca_key=privater.result()
|
|
)
|
|
passwort = self.frage("Passwort")
|
|
if passwort:
|
|
encryption = BestAvailableEncryption(passwort.encode())
|
|
else:
|
|
encryption = NoEncryption()
|
|
self.db.insert_certificate(
|
|
self.arguments.cn,
|
|
hex(zertifikat.serial_number),
|
|
zertifikat.public_bytes(Encoding.PEM),
|
|
privater.result().private_bytes(encoding=Encoding.PEM, format=PrivateFormat.PKCS8, encryption_algorithm=encryption),
|
|
True
|
|
)
|
|
|
|
def request(self):
|
|
erweiterungen = []
|
|
if self.arguments.ca:
|
|
erweiterungen.append(x509.BasicConstraints(True, self.arguments.ca))
|
|
else:
|
|
erweiterungen.append(x509.BasicConstraints(False, None))
|
|
if self.arguments.san:
|
|
alt = []
|
|
for san in self.arguments.san:
|
|
if ":" in san:
|
|
alt.append(x509.UniformResourceIdentifier(san))
|
|
elif "@" in san:
|
|
alt.append(x509.RFC822Name(san))
|
|
else:
|
|
alt.append(x509.DNSName(san))
|
|
erweiterungen.append(x509.SubjectAlternativeName(alt))
|
|
ziele = []
|
|
if self.arguments.server:
|
|
ziele.append(x509.oid.ExtendedKeyUsageOID.SERVER_AUTH)
|
|
if self.arguments.client:
|
|
ziele.append(x509.oid.ExtendedKeyUsageOID.CLIENT_AUTH)
|
|
if self.arguments.code:
|
|
ziele.append(x509.oid.ExtendedKeyUsageOID.CODE_SIGNING)
|
|
if self.arguments.email:
|
|
ziele.append(x509.oid.ExtendedKeyUsageOID.EMAIL_PROTECTION)
|
|
erweiterungen.append(x509.ExtendedKeyUsage(ziele))
|
|
anfrage = self.wrapper.request(
|
|
subject=x509.Name(self.parsedn(self.arguments)),
|
|
erweiterungen=erweiterungen,
|
|
certlänge=self.arguments.länge
|
|
)
|
|
passwort = self.frage("Passwort")
|
|
if passwort:
|
|
encryption = BestAvailableEncryption(passwort.encode())
|
|
else:
|
|
encryption = NoEncryption()
|
|
self.db.insert_request(
|
|
self.arguments.cn,
|
|
anfrage.public_bytes(Encoding.PEM),
|
|
privater.result().private_bytes(encoding=Encoding.PEM, format=PrivateFormat.PKCS8, encryption_algorithm=encryption),
|
|
)
|
|
self.connection.commit()
|
|
|
|
def sign(self):
|
|
def delete_request(subject):
|
|
self.cursor.execute("DELETE FROM requests WHERE commonname=?", (subject, ))
|
|
self.cursor.execute("SELECT commonname, csr, privatkey FROM requests")
|
|
for reihe in self.cursor.fetchall():
|
|
try:
|
|
anfrage = x509.load_pem_x509_csr(reihe["csr"], self.backend)
|
|
if not anfrage.is_signature_valid:
|
|
raise TypeError()
|
|
except TypeError:
|
|
delete_request(reihe["commonname"])
|
|
continue
|
|
print_info(anfrage)
|
|
if not self.frage("Möchten Sie das Zertifikat signieren[01]" ,int):
|
|
delete_request(reihe["commonname"])
|
|
continue
|
|
cas = []
|
|
for row in self.cursor.execute("SELECT commonname, publickey, privatkey FROM certificates WHERE ca=1"):
|
|
cas.append((row["commonname"], x509.load_pem_x509_certificate(row["publickey"], self.backend), row["privatkey"]))
|
|
print("Wähle die CA:\n")
|
|
for counter in range(1, len(cas)+1):
|
|
print("{}: {}".format(counter, cas[counter-1][0]))
|
|
while True:
|
|
antwort = self.frage("CA", int)
|
|
antwort -= 1
|
|
if 0 <= antwort < len(cas):
|
|
break
|
|
try:
|
|
privat = load_pem_private_key(cas[antwort][2], None, self.backend)
|
|
except TypeError:
|
|
while True:
|
|
try:
|
|
pw = self.frage("Passwort")
|
|
privat = load_pem_private_key(cas[antwort][2], pw.encode("utf-8"), self.backend)
|
|
except TypeError:
|
|
print("Falsches Passwort")
|
|
ca = cas[antwort][1]
|
|
dn = cas[antwort][0]
|
|
zertifikat = self.sign_cert(
|
|
anfrage.subject,
|
|
ca.subject,
|
|
datetime.timedelta(days=self.frage("Laufzeit", int)),
|
|
anfrage.public_key(),
|
|
privat,
|
|
[ext.value for ext in anfrage.extensions],
|
|
ca
|
|
)
|
|
self.db.insert_certificate(
|
|
reihe["commonname"],
|
|
hex(zertifikat.serial_number),
|
|
zertifikat.public_bytes(Encoding.PEM),
|
|
reihe["privatkey"],
|
|
dn,
|
|
0
|
|
)
|
|
delete_request(reihe["commonname"])
|
|
self.connection.commit()
|
|
|
|
if __name__ == "__main__":
|
|
parser = parser_factory()
|
|
argumente = parser.parse_args()
|
|
print(argumente.aktion)
|
|
datenbank = sqlite3.connect(argumente.db)
|
|
initdb(datenbank.cursor())
|
|
commandos = Commands(default_backend(), datenbank, argumente)
|
|
if commandos.get(argumente.aktion):
|
|
commandos.get(argumente.aktion)()
|
|
else:
|
|
parser.print_help() |