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Re: [tor-bugs] #26083 [Obfuscation/Obfsproxy]: Bridge detector. Fake?
#26083: Bridge detector. Fake?
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Reporter: cypherpunks | Owner: asn
Type: defect | Status: new
Priority: Medium | Milestone:
Component: Obfuscation/Obfsproxy | Version:
Severity: Normal | Resolution:
Keywords: | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor:
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Comment (by cypherpunks):
Here's the code in case Pastebin or someone else deletes it with a DMCA,
{{{
#!text/x-python
import os
import socks
import socket
import sys
import time
obfs4_detected = 0
host = sys.argv[1]
port = int(sys.argv[2])
print "Wait for 100 sec. Verify target: " +host, port
s = socks.socksocket()
s.set_proxy(socks.SOCKS5, "127.0.0.1", 9150)
s.connect((host, port))
rand_string = os.urandom(16384)
s.send(rand_string)
s.settimeout(15)
try:
data = s.recv(16384)
if data == "":
obfs4_detected = 1
except socket.timeout:
obfs4_detected = 0
s.close()
if obfs4_detected == 1:
s = socks.socksocket()
s.set_proxy(socks.SOCKS5, "127.0.0.1", 9150)
s.connect((host, port))
rand_string = os.urandom(8191)
s.send(rand_string)
start = time.time()
s.settimeout(95)
try:
data = s.recv(16384)
if data == "":
end = time.time()
delta = end - start
if delta >= 29:
obfs4_detected = 1
except socket.timeout:
obfs4_detected = 0
s.close()
if obfs4_detected:
print "DETECTED!!!!!111"
else:
print "NOT OBFS4?"
}}}
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26083#comment:2>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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