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comparison web/secure.py @ 185:adbf70d1449f

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working
author Matt Johnston <matt@ucc.asn.au>
date Thu, 06 Feb 2014 22:45:16 +0800
parents
children 101c66da848d
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184:cbe14244a372 185:adbf70d1449f
1 import os
2 import time
3 import fcntl
4 import hmac
5 import binascii
6 import sys
7
8 import config
9
10 __all__ = ["get_csrf_blob", "check_csrf_blob", "setup_csrf"]
11
12 def get_user_hash():
13 return "aaa"
14
15 def setup_csrf():
16 NONCE_SIZE=16
17 global _csrf_fd, _csrf_key
18 _csrf_fd = open('%s/csrf.dat' % config.DATA_PATH, 'r+')
19
20 try:
21 fcntl.lockf(_csrf_fd, fcntl.LOCK_EX | fcntl.LOCK_NB)
22 os.fchmod(_csrf_fd.fileno(), 0600)
23 _csrf_fd.write("%d-%s" % (os.getpid(), binascii.hexlify(os.urandom(NONCE_SIZE))))
24 _csrf_fd.flush()
25 _csrf_fd.seek(0)
26 except IOError:
27 pass
28 fcntl.lockf(_csrf_fd, fcntl.LOCK_SH)
29 _csrf_key = _csrf_fd.read()
30 # keep the lock open until we go away
31
32
33 def get_csrf_blob():
34 expiry = int(config.CSRF_TIMEOUT + time.time())
35 content = '%s-%s' % (get_user_hash(), expiry)
36 mac = hmac.new(_csrf_key, content).hexdigest()
37 return "%s-%s" % (content, mac)
38
39 def check_csrf_blob(blob):
40 toks = blob.split('-')
41 if len(toks) != 3:
42 return False
43
44 user, expiry, mac = toks
45 if user != get_user_hash():
46 return False
47
48 try:
49 exp = int(expiry)
50 except ValueError:
51 return False
52
53 if exp < 1000000000:
54 return False
55
56 if exp > time.time():
57 return False
58
59 check_content = "%s-%s" % (user, expiry)
60 check_mac = hmac.new(_csrf_key, content).hexdigest()
61 if mac == check_mac:
62 return True
63
64 return False
65