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"""0MQ authentication related functions and classes."""
# Copyright (C) PyZMQ Developers
# Distributed under the terms of the Modified BSD License.
import datetime
import glob
import io
import os
import zmq
from zmq.utils.strtypes import bytes, unicode, b, u
_cert_secret_banner = u("""# **** Generated on {0} by pyzmq ****
# ZeroMQ CURVE **Secret** Certificate
# DO NOT PROVIDE THIS FILE TO OTHER USERS nor change its permissions.
""")
_cert_public_banner = u("""# **** Generated on {0} by pyzmq ****
# ZeroMQ CURVE Public Certificate
# Exchange securely, or use a secure mechanism to verify the contents
# of this file after exchange. Store public certificates in your home
# directory, in the .curve subdirectory.
""")
def _write_key_file(key_filename, banner, public_key, secret_key=None, metadata=None, encoding='utf-8'):
"""Create a certificate file"""
if isinstance(public_key, bytes):
public_key = public_key.decode(encoding)
if isinstance(secret_key, bytes):
secret_key = secret_key.decode(encoding)
with io.open(key_filename, 'w', encoding='utf8') as f:
f.write(banner.format(datetime.datetime.now()))
f.write(u('metadata\n'))
if metadata:
for k, v in metadata.items():
if isinstance(k, bytes):
k = k.decode(encoding)
if isinstance(v, bytes):
v = v.decode(encoding)
f.write(u(" {0} = {1}\n").format(k, v))
f.write(u('curve\n'))
f.write(u(" public-key = \"{0}\"\n").format(public_key))
if secret_key:
f.write(u(" secret-key = \"{0}\"\n").format(secret_key))
def create_certificates(key_dir, name, metadata=None):
"""Create zmq certificates.
Returns the file paths to the public and secret certificate files.
"""
public_key, secret_key = zmq.curve_keypair()
base_filename = os.path.join(key_dir, name)
secret_key_file = "{0}.key_secret".format(base_filename)
public_key_file = "{0}.key".format(base_filename)
now = datetime.datetime.now()
_write_key_file(public_key_file,
_cert_public_banner.format(now),
public_key)
_write_key_file(secret_key_file,
_cert_secret_banner.format(now),
public_key,
secret_key=secret_key,
metadata=metadata)
return public_key_file, secret_key_file
def load_certificate(filename):
"""Load public and secret key from a zmq certificate.
Returns (public_key, secret_key)
If the certificate file only contains the public key,
secret_key will be None.
If there is no public key found in the file, ValueError will be raised.
"""
public_key = None
secret_key = None
if not os.path.exists(filename):
raise IOError("Invalid certificate file: {0}".format(filename))
with open(filename, 'rb') as f:
for line in f:
line = line.strip()
if line.startswith(b'#'):
continue
if line.startswith(b'public-key'):
public_key = line.split(b"=", 1)[1].strip(b' \t\'"')
if line.startswith(b'secret-key'):
secret_key = line.split(b"=", 1)[1].strip(b' \t\'"')
if public_key and secret_key:
break
if public_key is None:
raise ValueError("No public key found in %s" % filename)
return public_key, secret_key
def load_certificates(directory='.'):
"""Load public keys from all certificates in a directory"""
certs = {}
if not os.path.isdir(directory):
raise IOError("Invalid certificate directory: {0}".format(directory))
# Follow czmq pattern of public keys stored in *.key files.
glob_string = os.path.join(directory, "*.key")
cert_files = glob.glob(glob_string)
for cert_file in cert_files:
public_key, _ = load_certificate(cert_file)
if public_key:
certs[public_key] = True
return certs
__all__ = ['create_certificates', 'load_certificate', 'load_certificates']
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