1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
# GNU MediaGoblin -- federated, autonomous media hosting
# Copyright (C) 2011, 2012 MediaGoblin contributors. See AUTHORS.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import bcrypt
import random
import six
from mediagoblin import mg_globals
from mediagoblin.tools.crypto import get_timed_signer_url
from mediagoblin.tools.mail import send_email
from mediagoblin.tools.template import render_template
def bcrypt_check_password(raw_pass, stored_hash, extra_salt=None):
"""
Check to see if this password matches.
Args:
- raw_pass: user submitted password to check for authenticity.
- stored_hash: The hash of the raw password (and possibly extra
salt) to check against
- extra_salt: (optional) If this password is with stored with a
non-database extra salt (probably in the config file) for extra
security, factor this into the check.
Returns:
True or False depending on success.
"""
if extra_salt:
raw_pass = "{}:{}".format(extra_salt, raw_pass)
hashed_pass = bcrypt.hashpw(raw_pass.encode('utf-8'), stored_hash)
# Reduce risk of timing attacks by hashing again with a random
# number (thx to zooko on this advice, which I hopefully
# incorporated right.)
#
# See also:
rand_salt = bcrypt.gensalt(5)
randplus_stored_hash = bcrypt.hashpw(stored_hash, rand_salt)
randplus_hashed_pass = bcrypt.hashpw(hashed_pass, rand_salt)
return randplus_stored_hash == randplus_hashed_pass
def bcrypt_gen_password_hash(raw_pass, extra_salt=None):
"""
Generate a salt for this new password.
Args:
- raw_pass: user submitted password
- extra_salt: (optional) If this password is with stored with a
non-database extra salt
"""
if extra_salt:
raw_pass = "{}:{}".format(extra_salt, raw_pass)
return str(
bcrypt.hashpw(raw_pass.encode('utf-8'), bcrypt.gensalt()))
def fake_login_attempt():
"""
Pretend we're trying to login.
Nothing actually happens here, we're just trying to take up some
time, approximately the same amount of time as
bcrypt_check_password, so as to avoid figuring out what users are
on the system by intentionally faking logins a bunch of times.
"""
rand_salt = bcrypt.gensalt(5)
hashed_pass = bcrypt.hashpw(str(random.random()), rand_salt)
randplus_stored_hash = bcrypt.hashpw(str(random.random()), rand_salt)
randplus_hashed_pass = bcrypt.hashpw(hashed_pass, rand_salt)
randplus_stored_hash == randplus_hashed_pass
EMAIL_FP_VERIFICATION_TEMPLATE = (
"{uri}?"
"token={fp_verification_key}")
def send_fp_verification_email(user, request):
"""
Send the verification email to users to change their password.
Args:
- user: a user object
- request: the request
"""
fp_verification_key = get_timed_signer_url('mail_verification_token') \
.dumps(user.id)
rendered_email = render_template(
request, 'mediagoblin/plugins/basic_auth/fp_verification_email.txt',
{'username': user.username,
'verification_url': EMAIL_FP_VERIFICATION_TEMPLATE.format(
uri=request.urlgen('mediagoblin.plugins.basic_auth.verify_forgot_password',
qualified=True),
fp_verification_key=fp_verification_key)})
# TODO: There is no error handling in place
send_email(
mg_globals.app_config['email_sender_address'],
[user.email],
'GNU MediaGoblin - Change forgotten password!',
rendered_email)
|
