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#
# Copyright (C) 2017 FreeIPA Contributors see COPYING for license
#
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from __future__ import absolute_import, print_function
import argparse
from cryptography import x509
from cryptography.x509.oid import NameOID
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization
import datetime
ISSUER_CN = 'example.test'
class ExternalCA:
"""
Provide external CA for testing
"""
def __init__(self, days=365):
self.now = datetime.datetime.utcnow()
self.delta = datetime.timedelta(days=days)
def create_ca(self, cn=ISSUER_CN):
"""Create root CA.
:returns: bytes -- Root CA in PEM format.
"""
self.ca_key = rsa.generate_private_key(
public_exponent=65537,
key_size=2048,
backend=default_backend(),
)
self.ca_public_key = self.ca_key.public_key()
subject = self.issuer = x509.Name([
x509.NameAttribute(NameOID.COMMON_NAME, str(cn)),
])
builder = x509.CertificateBuilder()
builder = builder.subject_name(subject)
builder = builder.issuer_name(self.issuer)
builder = builder.public_key(self.ca_public_key)
builder = builder.serial_number(x509.random_serial_number())
builder = builder.not_valid_before(self.now)
builder = builder.not_valid_after(self.now + self.delta)
builder = builder.add_extension(
x509.KeyUsage(
digital_signature=False,
content_commitment=False,
key_encipherment=False,
data_encipherment=False,
key_agreement=False,
key_cert_sign=True,
crl_sign=True,
encipher_only=False,
decipher_only=False,
),
critical=True,
)
builder = builder.add_extension(
x509.BasicConstraints(ca=True, path_length=None),
critical=True,
)
builder = builder.add_extension(
x509.SubjectKeyIdentifier.from_public_key(self.ca_public_key),
critical=False,
)
builder = builder.add_extension(
x509.AuthorityKeyIdentifier.from_issuer_public_key(
self.ca_public_key
),
critical=False,
)
cert = builder.sign(self.ca_key, hashes.SHA256(), default_backend())
return cert.public_bytes(serialization.Encoding.PEM)
def sign_csr(self, ipa_csr, path_length=1):
"""Sign certificate CSR.
:param ipa_csr: CSR in PEM format.
:type ipa_csr: bytes.
:returns: bytes -- Signed CA in PEM format.
"""
csr_tbs = x509.load_pem_x509_csr(ipa_csr, default_backend())
csr_public_key = csr_tbs.public_key()
csr_subject = csr_tbs.subject
builder = x509.CertificateBuilder()
builder = builder.public_key(csr_public_key)
builder = builder.subject_name(csr_subject)
builder = builder.serial_number(x509.random_serial_number())
builder = builder.issuer_name(self.issuer)
builder = builder.not_valid_before(self.now)
builder = builder.not_valid_after(self.now + self.delta)
builder = builder.add_extension(
x509.KeyUsage(
digital_signature=False,
content_commitment=False,
key_encipherment=False,
data_encipherment=False,
key_agreement=False,
key_cert_sign=True,
crl_sign=True,
encipher_only=False,
decipher_only=False,
),
critical=True,
)
builder = builder.add_extension(
x509.SubjectKeyIdentifier.from_public_key(csr_public_key),
critical=False,
)
builder = builder.add_extension(
x509.AuthorityKeyIdentifier.from_issuer_public_key(
self.ca_public_key
),
critical=False,
)
builder = builder.add_extension(
x509.BasicConstraints(ca=True, path_length=path_length),
critical=True,
)
cert = builder.sign(
private_key=self.ca_key,
algorithm=hashes.SHA256(),
backend=default_backend(),
)
return cert.public_bytes(serialization.Encoding.PEM)
def main():
IPA_CSR = '/root/ipa.csr'
ROOT_CA = '/tmp/rootca.pem'
IPA_CA = '/tmp/ipaca.pem'
parser = argparse.ArgumentParser("Create external CA")
parser.add_argument(
'--csr', type=argparse.FileType('rb'), default=IPA_CSR,
help="Path to ipa.csr (default: {})".format(IPA_CSR)
)
parser.add_argument(
'--rootca', type=argparse.FileType('wb'), default=ROOT_CA,
help="New root CA file (default: {})".format(ROOT_CA)
)
parser.add_argument(
'--ipaca', type=argparse.FileType('wb'), default=IPA_CA,
help="New IPA CA file (default: {})".format(ROOT_CA)
)
args = parser.parse_args()
with args.csr as f:
ipa_csr = f.read()
external_ca = ExternalCA()
root_ca = external_ca.create_ca()
ipa_ca = external_ca.sign_csr(ipa_csr)
with args.rootca as f:
f.write(root_ca)
with args.ipaca as f:
f.write(ipa_ca)
o = "ipa-server-install --external-cert-file={} --external-cert-file={}"
print(o.format(args.rootca.name, args.ipaca.name))
if __name__ == '__main__':
main()
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