hostap/hostapd/wps-ap-nfc.py
Jouni Malinen 03cd173bd8 WPS: Clear sent_carrier to avoid errors in python script
This is needed to avoid errors when reporting the result of an NFC
connection handover that failed.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
2013-02-24 13:12:32 +02:00

274 lines
7 KiB
Python
Executable file

#!/usr/bin/python
#
# Example nfcpy to hostapd wrapper for WPS NFC operations
# Copyright (c) 2012-2013, Jouni Malinen <j@w1.fi>
#
# This software may be distributed under the terms of the BSD license.
# See README for more details.
import os
import sys
import time
import nfc
import nfc.ndef
import nfc.llcp
import nfc.handover
import logging
logging.basicConfig()
import wpactrl
wpas_ctrl = '/var/run/hostapd'
def wpas_connect():
ifaces = []
if os.path.isdir(wpas_ctrl):
try:
ifaces = [os.path.join(wpas_ctrl, i) for i in os.listdir(wpas_ctrl)]
except OSError, error:
print "Could not find hostapd: ", error
return None
if len(ifaces) < 1:
print "No hostapd control interface found"
return None
for ctrl in ifaces:
try:
wpas = wpactrl.WPACtrl(ctrl)
return wpas
except wpactrl.error, error:
print "Error: ", error
pass
return None
def wpas_tag_read(message):
wpas = wpas_connect()
if (wpas == None):
return
print wpas.request("WPS_NFC_TAG_READ " + message.encode("hex"))
def wpas_get_config_token():
wpas = wpas_connect()
if (wpas == None):
return None
return wpas.request("WPS_NFC_CONFIG_TOKEN NDEF").rstrip().decode("hex")
def wpas_get_password_token():
wpas = wpas_connect()
if (wpas == None):
return None
return wpas.request("WPS_NFC_TOKEN NDEF").rstrip().decode("hex")
def wpas_get_handover_sel():
wpas = wpas_connect()
if (wpas == None):
return None
return wpas.request("NFC_GET_HANDOVER_SEL NDEF WPS-CR").rstrip().decode("hex")
def wpas_report_handover(req, sel):
wpas = wpas_connect()
if (wpas == None):
return None
return wpas.request("NFC_REPORT_HANDOVER RESP WPS " +
str(req).encode("hex") + " " +
str(sel).encode("hex"))
class HandoverServer(nfc.handover.HandoverServer):
def __init__(self):
super(HandoverServer, self).__init__()
def process_request(self, request):
print "HandoverServer - request received"
print "Parsed handover request: " + request.pretty()
sel = nfc.ndef.HandoverSelectMessage(version="1.2")
for carrier in request.carriers:
print "Remote carrier type: " + carrier.type
if carrier.type == "application/vnd.wfa.wsc":
print "WPS carrier type match - add WPS carrier record"
self.received_carrier = carrier.record
data = wpas_get_handover_sel()
if data is None:
print "Could not get handover select carrier record from hostapd"
continue
print "Handover select carrier record from hostapd:"
print data.encode("hex")
self.sent_carrier = data
message = nfc.ndef.Message(data);
sel.add_carrier(message[0], "active", message[1:])
print "Handover select:"
print sel.pretty()
print str(sel).encode("hex")
print "Sending handover select"
return sel
def wps_handover_resp(peer):
print "Trying to handle WPS handover"
srv = HandoverServer()
srv.sent_carrier = None
nfc.llcp.activate(peer);
try:
print "Trying handover";
srv.start()
print "Wait for disconnect"
while nfc.llcp.connected():
time.sleep(0.1)
print "Disconnected after handover"
except nfc.llcp.ConnectRefused:
print "Handover connection refused"
nfc.llcp.shutdown()
return
if srv.sent_carrier:
wpas_report_handover(srv.received_carrier, srv.sent_carrier)
print "Remove peer"
nfc.llcp.shutdown()
print "Done with handover"
def wps_tag_read(tag):
if len(tag.ndef.message):
message = nfc.ndef.Message(tag.ndef.message)
print "message type " + message.type
for record in message:
print "record type " + record.type
if record.type == "application/vnd.wfa.wsc":
print "WPS tag - send to hostapd"
wpas_tag_read(tag.ndef.message)
break
else:
print "Empty tag"
print "Remove tag"
while tag.is_present:
time.sleep(0.1)
def wps_write_config_tag(clf):
print "Write WPS config token"
data = wpas_get_config_token()
if (data == None):
print "Could not get WPS config token from hostapd"
return
print "Touch an NFC tag"
while True:
tag = clf.poll()
if tag == None:
time.sleep(0.1)
continue
break
print "Tag found - writing"
tag.ndef.message = data
print "Done - remove tag"
while tag.is_present:
time.sleep(0.1)
def wps_write_password_tag(clf):
print "Write WPS password token"
data = wpas_get_password_token()
if (data == None):
print "Could not get WPS password token from hostapd"
return
print "Touch an NFC tag"
while True:
tag = clf.poll()
if tag == None:
time.sleep(0.1)
continue
break
print "Tag found - writing"
tag.ndef.message = data
print "Done - remove tag"
while tag.is_present:
time.sleep(0.1)
def find_peer(clf):
while True:
if nfc.llcp.connected():
print "LLCP connected"
general_bytes = nfc.llcp.startup({})
peer = clf.listen(ord(os.urandom(1)) + 250, general_bytes)
if isinstance(peer, nfc.DEP):
print "listen -> DEP";
if peer.general_bytes.startswith("Ffm"):
print "Found DEP"
return peer
print "mismatch in general_bytes"
print peer.general_bytes
peer = clf.poll(general_bytes)
if isinstance(peer, nfc.DEP):
print "poll -> DEP";
if peer.general_bytes.startswith("Ffm"):
print "Found DEP"
return peer
print "mismatch in general_bytes"
print peer.general_bytes
if peer:
print "Found tag"
return peer
def main():
clf = nfc.ContactlessFrontend()
try:
if len(sys.argv) > 1 and sys.argv[1] == "write-config":
wps_write_config_tag(clf)
raise SystemExit
if len(sys.argv) > 1 and sys.argv[1] == "write-password":
wps_write_password_tag(clf)
raise SystemExit
while True:
print "Waiting for a tag or peer to be touched"
tag = find_peer(clf)
if isinstance(tag, nfc.DEP):
wps_handover_resp(tag)
continue
if tag.ndef:
wps_tag_read(tag)
continue
print "Not an NDEF tag - remove tag"
while tag.is_present:
time.sleep(0.1)
except KeyboardInterrupt:
raise SystemExit
finally:
clf.close()
raise SystemExit
if __name__ == '__main__':
main()