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pki.py
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pki.py
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from . import logging
import json
import os
# Ignore bandit false positive: B404:blacklist
# The purpose of this module is to safely encapsulate calls via fork.
import subprocess # nosec
import tempfile
import yaml
__all__ = ['PKI']
LOG = logging.getLogger(__name__)
class PKI:
def __init__(self, *, block_strings=True):
self.block_strings = block_strings
self._ca_config_string = None
@property
def ca_config(self):
if not self._ca_config_string:
self._ca_config_string = json.dumps({
'signing': {
'default': {
'expiry':
'8760h',
'usages': [
'signing', 'key encipherment', 'server auth',
'client auth'
],
},
},
})
return self._ca_config_string
def generate_ca(self, ca_name):
result = self._cfssl(['gencert', '-initca', 'csr.json'],
files={
'csr.json':
self.csr(name=ca_name, groups=['Kubernetes']),
})
return (self._wrap_ca(ca_name, result['cert']),
self._wrap_ca_key(ca_name, result['key']))
def generate_keypair(self, name):
priv_result = self._openssl(['genrsa', '-out', 'priv.pem'])
pub_result = self._openssl(
['rsa', '-in', 'priv.pem', '-pubout', '-out', 'pub.pem'],
files={
'priv.pem': priv_result['priv.pem'],
})
return (self._wrap_pub_key(name, pub_result['pub.pem']),
self._wrap_priv_key(name, priv_result['priv.pem']))
def generate_certificate(self,
name,
*,
ca_cert,
ca_key,
cn,
groups=None,
hosts=None):
if groups is None:
groups = []
if hosts is None:
hosts = []
result = self._cfssl(
[
'gencert', '-ca', 'ca.pem', '-ca-key', 'ca-key.pem', '-config',
'ca-config.json', 'csr.json'
],
files={
'ca-config.json': self.ca_config,
'ca.pem': ca_cert,
'ca-key.pem': ca_key,
'csr.json': self.csr(name=cn, groups=groups, hosts=hosts),
})
return (self._wrap_cert(name, result['cert']),
self._wrap_cert_key(name, result['key']))
def csr(self,
*,
name,
groups=None,
hosts=None,
key={
'algo': 'rsa',
'size': 2048
}):
if groups is None:
groups = []
if hosts is None:
hosts = []
return json.dumps({
'CN': name,
'key': key,
'hosts': hosts,
'names': [{
'O': g
} for g in groups],
})
def _cfssl(self, command, *, files=None):
if not files:
files = {}
with tempfile.TemporaryDirectory() as tmp:
for filename, data in files.items():
with open(os.path.join(tmp, filename), 'w') as f:
f.write(data)
# Ignore bandit false positive:
# B603:subprocess_without_shell_equals_true
# This method wraps cfssl calls originating from this module.
result = subprocess.check_output( # nosec
['cfssl'] + command, cwd=tmp, stderr=subprocess.PIPE)
if not isinstance(result, str):
result = result.decode('utf-8')
return json.loads(result)
def _openssl(self, command, *, files=None):
if not files:
files = {}
with tempfile.TemporaryDirectory() as tmp:
for filename, data in files.items():
with open(os.path.join(tmp, filename), 'w') as f:
f.write(data)
# Ignore bandit false positive:
# B603:subprocess_without_shell_equals_true
# This method wraps openssl calls originating from this module.
subprocess.check_call( # nosec
['openssl'] + command,
cwd=tmp,
stderr=subprocess.PIPE)
result = {}
for filename in os.listdir(tmp):
if filename not in files:
with open(os.path.join(tmp, filename)) as f:
result[filename] = f.read()
return result
def _wrap_ca(self, name, data):
return self._wrap(kind='CertificateAuthority', name=name, data=data)
def _wrap_ca_key(self, name, data):
return self._wrap(kind='CertificateAuthorityKey', name=name, data=data)
def _wrap_cert(self, name, data):
return self._wrap(kind='Certificate', name=name, data=data)
def _wrap_cert_key(self, name, data):
return self._wrap(kind='CertificateKey', name=name, data=data)
def _wrap_priv_key(self, name, data):
return self._wrap(kind='PrivateKey', name=name, data=data)
def _wrap_pub_key(self, name, data):
return self._wrap(kind='PublicKey', name=name, data=data)
def _wrap(self, *, data, kind, name):
return {
'schema': 'deckhand/%s/v1' % kind,
'metadata': {
'schema': 'metadata/Document/v1',
'name': name,
'layeringDefinition': {
'abstract': False,
'layer': 'site',
},
'storagePolicy': 'cleartext',
},
'data': self._block_literal(data),
}
def _block_literal(self, data):
if self.block_strings:
return block_literal(data)
else:
return data
class block_literal(str):
pass
def block_literal_representer(dumper, data):
return dumper.represent_scalar('tag:yaml.org,2002:str',
str(data),
style='|')
yaml.add_representer(block_literal, block_literal_representer)