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
|
#!/usr/bin/env python
# Copyright (c) 2014, NORDUnet A/S.
# See LICENSE for licensing information.
import argparse
import urllib2
import urllib
import json
import base64
import sys
import struct
import hashlib
import itertools
from certtools import *
import os
import signal
import select
import zipfile
parser = argparse.ArgumentParser(description='')
parser.add_argument('baseurl', help="Base URL for CT server")
parser.add_argument('--sct-file', default=None, metavar="dir", help='SCT:s to verify')
parser.add_argument('--parallel', type=int, default=16, metavar="n", help="Number of parallel verifications")
args = parser.parse_args()
from multiprocessing import Pool
baseurl = args.baseurl
sth = get_sth(baseurl)
def verifysct(sctentry):
timing = timing_point()
leafcert = base64.b64decode(sctentry["leafcert"])
if "issuer_key_hash" in sctentry:
issuer_key_hash = base64.b64decode(sctentry["issuer_key_hash"])
else:
issuer_key_hash = None
try:
if issuer_key_hash:
signed_entry = pack_precert(leafcert, issuer_key_hash)
else:
signed_entry = pack_cert(leafcert)
check_sct_signature(baseurl, signed_entry, sctentry["sct"], precert=issuer_key_hash)
timing_point(timing, "checksig")
except AssertionError, e:
print "ERROR:", e
return (None, None)
except urllib2.HTTPError, e:
print "ERROR:", e
return (None, None)
except ecdsa.keys.BadSignatureError, e:
print "ERROR: bad signature"
return (None, None)
if issuer_key_hash:
merkle_tree_leaf = pack_mtl_precert(sctentry["sct"]["timestamp"], leafcert, issuer_key_hash)
else:
merkle_tree_leaf = pack_mtl(sctentry["sct"]["timestamp"], leafcert)
leaf_hash = get_leaf_hash(merkle_tree_leaf)
try:
proof = get_proof_by_hash(baseurl, leaf_hash, sth["tree_size"])
except SystemExit:
return (None, None)
#print proof
leaf_index = proof["leaf_index"]
inclusion_proof = [base64.b64decode(e) for e in proof["audit_path"]]
calc_root_hash = verify_inclusion_proof(inclusion_proof, leaf_index, sth["tree_size"], leaf_hash)
root_hash = base64.b64decode(sth["sha256_root_hash"])
if root_hash != calc_root_hash:
print "sth"
print base64.b16encode(root_hash)
print base64.b16encode(calc_root_hash)
assert root_hash == calc_root_hash
timing_point(timing, "lookup")
return (True, timing["deltatimes"])
p = Pool(args.parallel, lambda: signal.signal(signal.SIGINT, signal.SIG_IGN))
sctfile = open(args.sct_file)
scts = (json.loads(row) for row in sctfile)
nverified = 0
lastprinted = 0
starttime = datetime.datetime.now()
try:
for result, timing in p.imap_unordered(verifysct, scts):
if timing == None:
print "error"
print "verified", nverified
p.terminate()
p.join()
sys.exit(1)
if result != None:
nverified += 1
deltatime = datetime.datetime.now() - starttime
deltatime_f = deltatime.seconds + deltatime.microseconds / 1000000.0
rate = nverified / deltatime_f
if nverified > lastprinted + 100:
print nverified, "rate %.1f" % rate
lastprinted = nverified
#print timing, "rate %.1f" % rate
print "verified", nverified
except KeyboardInterrupt:
p.terminate()
p.join()
|
