|
|
"""
|
|
|
Password generation for the IPython notebook.
|
|
|
"""
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Imports
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Stdlib
|
|
|
import getpass
|
|
|
import hashlib
|
|
|
import random
|
|
|
|
|
|
# Our own
|
|
|
from IPython.core.error import UsageError
|
|
|
from IPython.utils.py3compat import cast_bytes, str_to_bytes
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Globals
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
# Length of the salt in nr of hex chars, which implies salt_len * 4
|
|
|
# bits of randomness.
|
|
|
salt_len = 12
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Functions
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
def passwd(passphrase=None, algorithm='sha1'):
|
|
|
"""Generate hashed password and salt for use in notebook configuration.
|
|
|
|
|
|
In the notebook configuration, set `c.NotebookApp.password` to
|
|
|
the generated string.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
passphrase : str
|
|
|
Password to hash. If unspecified, the user is asked to input
|
|
|
and verify a password.
|
|
|
algorithm : str
|
|
|
Hashing algorithm to use (e.g, 'sha1' or any argument supported
|
|
|
by :func:`hashlib.new`).
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
hashed_passphrase : str
|
|
|
Hashed password, in the format 'hash_algorithm:salt:passphrase_hash'.
|
|
|
|
|
|
Examples
|
|
|
--------
|
|
|
>>> passwd('mypassword')
|
|
|
'sha1:7cf3:b7d6da294ea9592a9480c8f52e63cd42cfb9dd12'
|
|
|
|
|
|
"""
|
|
|
if passphrase is None:
|
|
|
for i in range(3):
|
|
|
p0 = getpass.getpass('Enter password: ')
|
|
|
p1 = getpass.getpass('Verify password: ')
|
|
|
if p0 == p1:
|
|
|
passphrase = p0
|
|
|
break
|
|
|
else:
|
|
|
print('Passwords do not match.')
|
|
|
else:
|
|
|
raise UsageError('No matching passwords found. Giving up.')
|
|
|
|
|
|
h = hashlib.new(algorithm)
|
|
|
salt = ('%0' + str(salt_len) + 'x') % random.getrandbits(4 * salt_len)
|
|
|
h.update(cast_bytes(passphrase, 'utf-8') + str_to_bytes(salt, 'ascii'))
|
|
|
|
|
|
return ':'.join((algorithm, salt, h.hexdigest()))
|
|
|
|
|
|
|
|
|
def passwd_check(hashed_passphrase, passphrase):
|
|
|
"""Verify that a given passphrase matches its hashed version.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
hashed_passphrase : str
|
|
|
Hashed password, in the format returned by `passwd`.
|
|
|
passphrase : str
|
|
|
Passphrase to validate.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
valid : bool
|
|
|
True if the passphrase matches the hash.
|
|
|
|
|
|
Examples
|
|
|
--------
|
|
|
>>> from IPython.lib.security import passwd_check
|
|
|
>>> passwd_check('sha1:0e112c3ddfce:a68df677475c2b47b6e86d0467eec97ac5f4b85a',
|
|
|
... 'mypassword')
|
|
|
True
|
|
|
|
|
|
>>> passwd_check('sha1:0e112c3ddfce:a68df677475c2b47b6e86d0467eec97ac5f4b85a',
|
|
|
... 'anotherpassword')
|
|
|
False
|
|
|
"""
|
|
|
try:
|
|
|
algorithm, salt, pw_digest = hashed_passphrase.split(':', 2)
|
|
|
except (ValueError, TypeError):
|
|
|
return False
|
|
|
|
|
|
try:
|
|
|
h = hashlib.new(algorithm)
|
|
|
except ValueError:
|
|
|
return False
|
|
|
|
|
|
if len(pw_digest) == 0:
|
|
|
return False
|
|
|
|
|
|
h.update(cast_bytes(passphrase, 'utf-8') + cast_bytes(salt, 'ascii'))
|
|
|
|
|
|
return h.hexdigest() == pw_digest
|
|
|
|
