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tools: cleanup function names and add crypto wrappers

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This commit is contained in:
Kishi85 2019-03-23 09:46:36 +01:00
parent 710c42c805
commit fd2134753a
5 changed files with 80 additions and 70 deletions
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12
acertmgr/__init__.py
View File

@ -37,8 +37,8 @@ def create_authority(settings):
acc_file = settings['account_key']
if not os.path.isfile(acc_file):
print("Account key not found at '{0}'. Creating RSA key.".format(acc_file))
tools.new_rsa_key(acc_file)
acc_key = tools.read_key(acc_file)
tools.new_account_key(acc_file)
acc_key = tools.read_pem_key(acc_file)
authority_module = importlib.import_module("acertmgr.authority.{0}".format(settings["api"]))
authority_class = getattr(authority_module, "ACMEAuthority")
@ -67,7 +67,7 @@ def cert_get(settings):
key_length = settings['key_length']
if not os.path.isfile(key_file):
print("SSL key not found at '{0}'. Creating {1} bit RSA key.".format(key_file, key_length))
tools.new_rsa_key(key_file, key_length)
tools.new_ssl_key(key_file, key_length)
acme = create_authority(settings)
@ -82,13 +82,13 @@ def cert_get(settings):
challenge_handlers[domain] = create_challenge_handler(settings['handlers'][domain])
try:
key = tools.read_key(key_file)
key = tools.read_pem_key(key_file)
cr = tools.new_cert_request(settings['domainlist'], key)
print("Reading account key...")
acme.register_account()
crt, ca = acme.get_crt_from_csr(cr, settings['domainlist'], challenge_handlers)
with io.open(crt_file, "w") as crt_fd:
crt_fd.write(tools.convert_cert_to_pem(crt))
crt_fd.write(tools.convert_cert_to_pem_str(crt))
# if resulting certificate is valid: store in final location
if tools.is_cert_valid(crt_file, 60):
@ -97,7 +97,7 @@ def cert_get(settings):
os.chmod(crt_final, stat.S_IREAD)
if "static_ca" in settings and not settings['static_ca'] and ca is not None:
with io.open(settings['ca_file'], "w") as ca_fd:
ca_fd.write(tools.convert_cert_to_pem(ca))
ca_fd.write(tools.convert_cert_to_pem_str(ca))
finally:
os.remove(csr_file)
os.remove(crt_file)

31
acertmgr/authority/v1.py
View File

@ -12,11 +12,6 @@ import json
import re
import time
from cryptography import x509
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import padding
from acertmgr import tools
from acertmgr.authority.acme import ACMEAuthority as AbstractACMEAuthority
@ -38,9 +33,9 @@ class ACMEAuthority(AbstractACMEAuthority):
header = {
"alg": "RS256",
"jwk": {
"e": tools.to_json_base64(tools.byte_string_format(numbers.e)),
"e": tools.bytes_to_base64url(tools.number_to_byte_format(numbers.e)),
"kty": "RSA",
"n": tools.to_json_base64(tools.byte_string_format(numbers.n)),
"n": tools.bytes_to_base64url(tools.number_to_byte_format(numbers.n)),
},
}
return header
@ -51,17 +46,14 @@ class ACMEAuthority(AbstractACMEAuthority):
# @param payload the message
# @return tuple of return code and request answer
def _send_signed(self, url, header, payload):
payload64 = tools.to_json_base64(json.dumps(payload).encode('utf8'))
payload64 = tools.bytes_to_base64url(json.dumps(payload).encode('utf8'))
protected = copy.deepcopy(header)
protected["nonce"] = tools.get_url(self.ca + "/directory").headers['Replay-Nonce']
protected64 = tools.to_json_base64(json.dumps(protected).encode('utf8'))
# @todo check why this padding is not working
# pad = padding.PSS(mgf=padding.MGF1(hashes.SHA256()), salt_length=padding.PSS.MAX_LENGTH)
pad = padding.PKCS1v15()
out = self.key.sign('.'.join([protected64, payload64]).encode('utf8'), pad, hashes.SHA256())
protected64 = tools.bytes_to_base64url(json.dumps(protected).encode('utf8'))
out = tools.signature_of_str(self.key, '.'.join([protected64, payload64]))
data = json.dumps({
"header": header, "protected": protected64,
"payload": payload64, "signature": tools.to_json_base64(out),
"payload": payload64, "signature": tools.bytes_to_base64url(out),
})
try:
resp = tools.get_url(url, data.encode('utf8'))
@ -94,10 +86,8 @@ class ACMEAuthority(AbstractACMEAuthority):
# @note algorithm and parts of the code are from acme-tiny
def get_crt_from_csr(self, csr, domains, challenge_handlers):
header = self._prepare_header()
accountkey_json = json.dumps(header['jwk'], sort_keys=True, separators=(',', ':'))
account_hash = hashes.Hash(hashes.SHA256(), backend=default_backend())
account_hash.update(accountkey_json.encode('utf8'))
account_thumbprint = tools.to_json_base64(account_hash.finalize())
account_thumbprint = tools.bytes_to_base64url(
tools.hash_of_str(json.dumps(header['jwk'], sort_keys=True, separators=(',', ':'))))
challenges = dict()
tokens = dict()
@ -173,15 +163,14 @@ class ACMEAuthority(AbstractACMEAuthority):
# get the new certificate
print("Signing certificate...")
csr_der = csr.public_bytes(serialization.Encoding.DER)
code, result = self._send_signed(self.ca + "/acme/new-cert", header, {
"resource": "new-cert",
"csr": tools.to_json_base64(csr_der),
"csr": tools.bytes_to_base64url(tools.convert_csr_to_der_bytes(csr)),
})
if code != 201:
raise ValueError("Error signing certificate: {0} {1}".format(code, result))
# return signed certificate!
print("Certificate signed!")
cert = x509.load_der_x509_certificate(result, default_backend())
cert = tools.convert_der_bytes_to_cert(result)
return cert, tools.download_issuer_ca(cert)

31
acertmgr/authority/v2.py
View File

@ -11,11 +11,6 @@ import json
import re
import time
from cryptography import x509
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import padding
from acertmgr import tools
from acertmgr.authority.acme import ACMEAuthority as AbstractACMEAuthority
@ -56,8 +51,8 @@ class ACMEAuthority(AbstractACMEAuthority):
"alg": self.algorithm,
"jwk": {
"kty": "RSA",
"e": tools.to_json_base64(tools.byte_string_format(numbers.e)),
"n": tools.to_json_base64(tools.byte_string_format(numbers.n)),
"e": tools.bytes_to_base64url(tools.number_to_byte_format(numbers.e)),
"n": tools.bytes_to_base64url(tools.number_to_byte_format(numbers.n)),
},
}
self.account_id = None # will be updated to correct value during account registration
@ -92,7 +87,7 @@ class ACMEAuthority(AbstractACMEAuthority):
payload = {}
if not protected:
protected = {}
payload64 = tools.to_json_base64(json.dumps(payload).encode('utf8'))
payload64 = tools.bytes_to_base64url(json.dumps(payload).encode('utf8'))
# Request a new nonce if there is none in cache
if not self.nonce:
@ -104,13 +99,12 @@ class ACMEAuthority(AbstractACMEAuthority):
protected["alg"] = self.algorithm
if self.account_id:
protected["kid"] = self.account_id
protected64 = tools.to_json_base64(json.dumps(protected).encode('utf8'))
pad = padding.PKCS1v15()
out = self.key.sign('.'.join([protected64, payload64]).encode('utf8'), pad, hashes.SHA256())
protected64 = tools.bytes_to_base64url(json.dumps(protected).encode('utf8'))
out = tools.signature_of_str(self.key, '.'.join([protected64, payload64]))
data = json.dumps({
"protected": protected64,
"payload": payload64,
"signature": tools.to_json_base64(out),
"signature": tools.bytes_to_base64url(out),
})
try:
return self._request_url(url, data, raw_result)
@ -153,10 +147,8 @@ class ACMEAuthority(AbstractACMEAuthority):
# @return the certificate and corresponding ca as a tuple
# @note algorithm and parts of the code are from acme-tiny
def get_crt_from_csr(self, csr, domains, challenge_handlers):
accountkey_json = json.dumps(self.account_protected['jwk'], sort_keys=True, separators=(',', ':'))
account_hash = hashes.Hash(hashes.SHA256(), backend=default_backend())
account_hash.update(accountkey_json.encode('utf8'))
account_thumbprint = tools.to_json_base64(account_hash.finalize())
account_thumbprint = tools.bytes_to_base64url(
tools.hash_of_str(json.dumps(self.account_protected['jwk'], sort_keys=True, separators=(',', ':'))))
print("Ordering certificate for {}".format(domains))
identifiers = [{'type': 'dns', 'value': domain} for domain in domains]
@ -242,9 +234,8 @@ class ACMEAuthority(AbstractACMEAuthority):
# get the new certificate
print("Finalizing certificate")
csr_der = csr.public_bytes(serialization.Encoding.DER)
code, finalize, _ = self._request_acme_url(order['finalize'], {
"csr": tools.to_json_base64(csr_der),
"csr": tools.bytes_to_base64url(tools.convert_csr_to_der_bytes(csr)),
})
while code < 400 and (finalize.get('status') == 'pending' or finalize.get('status') == 'processing'):
time.sleep(5)
@ -261,10 +252,10 @@ class ACMEAuthority(AbstractACMEAuthority):
cert_dict = re.match((r'(?P<cert>-----BEGIN CERTIFICATE-----[^\-]+-----END CERTIFICATE-----)\n\n'
r'(?P<ca>-----BEGIN CERTIFICATE-----[^\-]+-----END CERTIFICATE-----)?'),
certificate.decode('utf-8'), re.DOTALL).groupdict()
cert = x509.load_pem_x509_certificate(cert_dict['cert'].encode('utf-8'), default_backend())
cert = tools.convert_pem_str_to_cert(cert_dict['cert'])
if cert_dict['ca'] is None:
ca = tools.download_issuer_ca(cert)
else:
ca = x509.load_pem_x509_certificate(cert_dict['ca'].encode('utf-8'), default_backend())
ca = tools.convert_pem_str_to_cert(cert_dict['ca'])
return cert, ca

7
acertmgr/modes/dns/abstract.py
View File

@ -9,8 +9,6 @@ import dns.query
import dns.resolver
import dns.tsigkeyring
import dns.update
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from acertmgr import tools
from acertmgr.modes.abstract import AbstractChallengeHandler
@ -40,10 +38,7 @@ class DNSChallengeHandler(AbstractChallengeHandler):
@staticmethod
def _determine_txtvalue(thumbprint, token):
keyauthorization = "{0}.{1}".format(token, thumbprint)
digest = hashes.Hash(hashes.SHA256(), backend=default_backend())
digest.update(keyauthorization.encode('utf8'))
return tools.to_json_base64(digest.finalize())
return tools.bytes_to_base64url(tools.hash_of_str("{0}.{1}".format(token, thumbprint)))
def create_challenge(self, domain, thumbprint, token):
domain = self._determine_challenge_domain(domain)

69
acertmgr/tools.py
View File

@ -16,7 +16,7 @@ import six
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
from cryptography.hazmat.primitives.asymmetric import rsa, padding
from cryptography.x509.oid import NameOID, ExtensionOID
try:
@ -39,8 +39,7 @@ def get_url(url, data=None, headers=None):
# @return the tuple of dates: (notBefore, notAfter)
def get_cert_valid_times(cert_file):
with io.open(cert_file, 'r') as f:
cert_data = f.read().encode('utf-8')
cert = x509.load_pem_x509_certificate(cert_data, default_backend())
cert = convert_pem_str_to_cert(f.read())
return cert.not_valid_before, cert.not_valid_after
@ -85,9 +84,15 @@ def new_cert_request(names, key):
return req
# @brief generate a new rsa key
# @brief generate a new ssl key
# @param path path where the new key file should be written
def new_rsa_key(path, key_size=4096):
def new_account_key(path, key_size=4096):
return new_ssl_key(path, key_size)
# @brief generate a new ssl key
# @param path path where the new key file should be written
def new_ssl_key(path, key_size=4096):
private_key = rsa.generate_private_key(
public_exponent=65537,
key_size=key_size,
@ -106,6 +111,15 @@ def new_rsa_key(path, key_size=4096):
print('Warning: Could not set file permissions on {0}!'.format(path))
# @brief read a key from file
# @param path path to key file
# @return the key in pyopenssl format
def read_pem_key(path):
with io.open(path, 'r') as f:
key_data = f.read().encode('utf-8')
return serialization.load_pem_private_key(key_data, None, default_backend())
# @brief download the issuer ca for a given certificate
# @param cert certificate data
# @returns ca certificate data
@ -124,7 +138,7 @@ def download_issuer_ca(cert):
print("Downloading CA certificate from {}".format(ca_issuers))
resp = get_url(ca_issuers)
code = resp.getcode()
if code >= 400:
if code >= 400:
print("Could not download issuer CA (error {}) for given certificate: {}".format(code, cert))
return None
@ -134,30 +148,51 @@ def download_issuer_ca(cert):
# @brief convert certificate to PEM format
# @param cert certificate object in pyopenssl format
# @return the certificate in PEM format
def convert_cert_to_pem(cert):
def convert_cert_to_pem_str(cert):
return cert.public_bytes(serialization.Encoding.PEM).decode('utf8')
# @brief read a key from file
# @param path path to key file
# @return the key in pyopenssl format
def read_key(path):
with io.open(path, 'r') as f:
key_data = f.read().encode('utf-8')
return serialization.load_pem_private_key(key_data, None, default_backend())
# @brief load a PEM certificate from str
def convert_pem_str_to_cert(certdata):
return x509.load_pem_x509_certificate(certdata.encode('utf8'), default_backend())
# @brief serialize CSR to DER bytes
def convert_csr_to_der_bytes(data):
return data.public_bytes(serialization.Encoding.DER)
# @brief load a DER certificate from str
def convert_der_bytes_to_cert(data):
return x509.load_der_x509_certificate(data, default_backend())
# @brief sign string with key
def signature_of_str(key, string):
# @todo check why this padding is not working
# pad = padding.PSS(mgf=padding.MGF1(hashes.SHA256()), salt_length=padding.PSS.MAX_LENGTH)
pad = padding.PKCS1v15()
return key.sign(string.encode('utf8'), pad, hashes.SHA256())
# @brief hash a string
def hash_of_str(string):
account_hash = hashes.Hash(hashes.SHA256(), backend=default_backend())
account_hash.update(string.encode('utf8'))
return account_hash.finalize()
# @brief helper function to base64 encode for JSON objects
# @param b the string to encode
# @param b the byte-string to encode
# @return the encoded string
def to_json_base64(b):
def bytes_to_base64url(b):
return base64.urlsafe_b64encode(b).decode('utf8').replace("=", "")
# @brief convert numbers to byte-string
# @param num number to convert
# @return byte-string containing the number
def byte_string_format(num):
def number_to_byte_format(num):
n = format(num, 'x')
n = "0{0}".format(n) if len(n) % 2 else n
return binascii.unhexlify(n)