DPP: Example script for NFC bootstrapping method
This Python script is an example on how nfcpy can be used to drive an NFC Device to perform DPP bootstrapping operations over DPP (tag with NFC URI and negotiated connection handover). Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen
Jouni Malinen
parent
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commit
703c2b6457
1 changed files with 670 additions and 0 deletions
670
wpa_supplicant/examples/dpp-nfc.py
Executable file
670
wpa_supplicant/examples/dpp-nfc.py
Executable file
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#!/usr/bin/python3
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#
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# Example nfcpy to wpa_supplicant wrapper for DPP NFC operations
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# Copyright (c) 2012-2013, Jouni Malinen <j@w1.fi>
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# Copyright (c) 2019-2020, The Linux Foundation
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#
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# This software may be distributed under the terms of the BSD license.
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# See README for more details.
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import os
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import sys
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import time
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import threading
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import argparse
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import nfc
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import ndef
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import logging
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scriptsdir = os.path.dirname(os.path.realpath("dpp-nfc.py"))
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sys.path.append(os.path.join(scriptsdir, '..', '..', 'wpaspy'))
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import wpaspy
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wpas_ctrl = '/var/run/wpa_supplicant'
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ifname = None
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init_on_touch = False
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in_raw_mode = False
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prev_tcgetattr = 0
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no_input = False
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srv = None
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continue_loop = True
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terminate_now = False
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summary_file = None
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success_file = None
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def summary(txt):
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print(txt)
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if summary_file:
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with open(summary_file, 'a') as f:
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f.write(txt + "\n")
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def success_report(txt):
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summary(txt)
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if success_file:
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with open(success_file, 'a') as f:
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f.write(txt + "\n")
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def wpas_connect():
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ifaces = []
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if os.path.isdir(wpas_ctrl):
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try:
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ifaces = [os.path.join(wpas_ctrl, i) for i in os.listdir(wpas_ctrl)]
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except OSError as error:
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print("Could not find wpa_supplicant: ", error)
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return None
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if len(ifaces) < 1:
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print("No wpa_supplicant control interface found")
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return None
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for ctrl in ifaces:
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if ifname:
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if ifname not in ctrl:
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continue
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try:
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print("Trying to use control interface " + ctrl)
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wpas = wpaspy.Ctrl(ctrl)
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return wpas
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except Exception as e:
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pass
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return None
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def dpp_nfc_uri_process(uri):
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wpas = wpas_connect()
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if wpas is None:
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return False
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peer_id = wpas.request("DPP_NFC_URI " + uri)
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if "FAIL" in peer_id:
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print("Could not parse DPP URI from NFC URI record")
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return False
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peer_id = int(peer_id)
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print("peer_id=%d" % peer_id)
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cmd = "DPP_AUTH_INIT peer=%d" % peer_id
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res = wpas.request(cmd)
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if "OK" not in res:
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print("Failed to initiate DPP Authentication")
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return False
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print("DPP Authentication initiated")
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return True
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def dpp_hs_tag_read(record):
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wpas = wpas_connect()
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if wpas is None:
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return False
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print(record)
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if len(record.data) < 5:
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print("Too short DPP HS")
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return False
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if record.data[0] != 0:
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print("Unexpected URI Identifier Code")
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return False
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uribuf = record.data[1:]
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try:
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uri = uribuf.decode()
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except:
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print("Invalid URI payload")
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return False
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print("URI: " + uri)
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if not uri.startswith("DPP:"):
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print("Not a DPP URI")
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return False
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return dpp_nfc_uri_process(uri)
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def get_status(wpas, extra=None):
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if extra:
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extra = "-" + extra
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else:
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extra = ""
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res = wpas.request("STATUS" + extra)
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lines = res.splitlines()
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vals = dict()
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for l in lines:
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try:
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[name, value] = l.split('=', 1)
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except ValueError:
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logger.info("Ignore unexpected status line: " + l)
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continue
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vals[name] = value
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return vals
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def get_status_field(wpas, field, extra=None):
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vals = get_status(wpas, extra)
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if field in vals:
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return vals[field]
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return None
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def own_addr(wpas):
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return get_status_field(wpas, "address")
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def dpp_bootstrap_gen(wpas, type="qrcode", chan=None, mac=None, info=None,
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curve=None, key=None):
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cmd = "DPP_BOOTSTRAP_GEN type=" + type
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if chan:
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cmd += " chan=" + chan
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if mac:
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if mac is True:
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mac = own_addr(wpas)
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cmd += " mac=" + mac.replace(':', '')
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if info:
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cmd += " info=" + info
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if curve:
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cmd += " curve=" + curve
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if key:
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cmd += " key=" + key
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res = wpas.request(cmd)
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if "FAIL" in res:
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raise Exception("Failed to generate bootstrapping info")
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return int(res)
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def wpas_get_nfc_uri(start_listen=True):
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wpas = wpas_connect()
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if wpas is None:
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return None
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global own_id
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own_id = dpp_bootstrap_gen(wpas, type="nfc-uri", chan="81/1", mac=True)
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res = wpas.request("DPP_BOOTSTRAP_GET_URI %d" % own_id).rstrip()
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if "FAIL" in res:
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return None
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if start_listen:
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wpas.request("DPP_LISTEN 2412 netrole=configurator")
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return res
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def wpas_report_handover_req(uri):
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wpas = wpas_connect()
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if wpas is None:
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return None
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global own_id
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cmd = "DPP_NFC_HANDOVER_REQ own=%d uri=%s" % (own_id, uri)
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return wpas.request(cmd)
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def wpas_report_handover_sel(uri):
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wpas = wpas_connect()
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if wpas is None:
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return None
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global own_id
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cmd = "DPP_NFC_HANDOVER_SEL own=%d uri=%s" % (own_id, uri)
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return wpas.request(cmd)
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def dpp_handover_client(llc):
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uri = wpas_get_nfc_uri(start_listen=False)
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uri = ndef.UriRecord(uri)
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print("NFC URI record for DPP: " + str(uri))
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carrier = ndef.Record('application/vnd.wfa.dpp', 'A', uri.data)
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hr = ndef.HandoverRequestRecord(version="1.4", crn=os.urandom(2))
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hr.add_alternative_carrier('active', carrier.name)
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message = [hr, carrier]
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print("NFC Handover Request message for DPP: " + str(message))
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client = nfc.handover.HandoverClient(llc)
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try:
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summary("Trying to initiate NFC connection handover")
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client.connect()
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summary("Connected for handover")
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except nfc.llcp.ConnectRefused:
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summary("Handover connection refused")
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client.close()
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return
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except Exception as e:
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summary("Other exception: " + str(e))
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client.close()
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return
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summary("Sending handover request")
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if not client.send_records(message):
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summary("Failed to send handover request")
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client.close()
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return
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summary("Receiving handover response")
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message = client.recv_records(timeout=3.0)
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if message is None:
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summary("No response received")
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client.close()
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return
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print("Received message: " + str(message))
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if len(message) < 1 or \
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not isinstance(message[0], ndef.HandoverSelectRecord):
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summary("Response was not Hs - received: " + message.type)
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client.close()
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return
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print("Received message")
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print("alternative carriers: " + str(message[0].alternative_carriers))
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for carrier in message:
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if isinstance(carrier, ndef.HandoverSelectRecord):
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continue
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print("Remote carrier type: " + carrier.type)
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if carrier.type == "application/vnd.wfa.dpp":
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if len(carrier.data) == 0 or carrier.data[0] != 0:
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print("URI Identifier Code 'None' not seen")
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continue
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print("DPP carrier type match - send to wpa_supplicant")
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uri = carrier.data[1:].decode("utf-8")
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print("DPP URI: " + uri)
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res = wpas_report_handover_sel(uri)
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if res is None or "FAIL" in res:
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summary("DPP handover report rejected")
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break
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success_report("DPP handover reported successfully (initiator)")
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print("peer_id=" + res)
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peer_id = int(res)
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# TODO: Single Configurator instance
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wpas = wpas_connect()
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if wpas is None:
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break
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res = wpas.request("DPP_CONFIGURATOR_ADD")
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if "FAIL" in res:
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print("Failed to initiate Configurator")
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break
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conf_id = int(res)
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global own_id
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print("Initiate DPP authentication")
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cmd = "DPP_AUTH_INIT peer=%d own=%d conf=sta-dpp configurator=%d" % (peer_id, own_id, conf_id)
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res = wpas.request(cmd)
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if "FAIL" in res:
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print("Failed to initiate DPP authentication")
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break
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print("Remove peer")
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client.close()
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print("Done with handover")
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global only_one
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if only_one:
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print("only_one -> stop loop")
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global continue_loop
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continue_loop = False
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global no_wait
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if no_wait:
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print("Trying to exit..")
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global terminate_now
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terminate_now = True
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print("Returning from dpp_handover_client")
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class HandoverServer(nfc.handover.HandoverServer):
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def __init__(self, llc):
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super(HandoverServer, self).__init__(llc)
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self.sent_carrier = None
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self.ho_server_processing = False
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self.success = False
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def process_handover_request_message(self, records):
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self.ho_server_processing = True
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clear_raw_mode()
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print("\nHandoverServer - request received: " + str(records))
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carrier = None
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hs = ndef.HandoverSelectRecord('1.4')
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sel = [hs]
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found = False
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for carrier in records:
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if isinstance(carrier, ndef.HandoverRequestRecord):
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continue
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print("Remote carrier type: " + carrier.type)
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if carrier.type == "application/vnd.wfa.dpp":
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print("DPP carrier type match - add DPP carrier record")
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if len(carrier.data) == 0 or carrier.data[0] != 0:
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print("URI Identifier Code 'None' not seen")
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continue
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uri = carrier.data[1:].decode("utf-8")
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print("Received DPP URI: " + uri)
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data = wpas_get_nfc_uri(start_listen=False)
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print("Own URI (pre-processing): %s" % data)
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res = wpas_report_handover_req(uri)
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if res is None or "FAIL" in res:
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print("DPP handover request processing failed")
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continue
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found = True
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self.received_carrier = carrier
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wpas = wpas_connect()
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if wpas is None:
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continue
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global own_id
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data = wpas.request("DPP_BOOTSTRAP_GET_URI %d" % own_id).rstrip()
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if "FAIL" in data:
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continue
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print("Own URI (post-processing): %s" % data)
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uri = ndef.UriRecord(data)
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print("Own bootstrapping NFC URI record: " + str(uri))
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info = wpas.request("DPP_BOOTSTRAP_INFO %d" % own_id)
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freq = None
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for line in info.splitlines():
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if line.startswith("use_freq="):
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freq = int(line.split('=')[1])
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if freq is None:
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print("No channel negotiated over NFC - use channel 1")
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freq = 2412
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res = wpas.request("DPP_LISTEN %d" % freq)
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if "OK" not in res:
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print("Failed to start DPP listen")
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break
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carrier = ndef.Record('application/vnd.wfa.dpp', 'A', uri.data)
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print("Own DPP carrier record: " + str(carrier))
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hs.add_alternative_carrier('active', carrier.name)
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sel = [hs, carrier]
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break
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summary("Sending handover select: " + str(sel))
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self.success = True
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return sel
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def clear_raw_mode():
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import sys, tty, termios
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global prev_tcgetattr, in_raw_mode
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if not in_raw_mode:
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return
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fd = sys.stdin.fileno()
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termios.tcsetattr(fd, termios.TCSADRAIN, prev_tcgetattr)
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in_raw_mode = False
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def getch():
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import sys, tty, termios, select
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global prev_tcgetattr, in_raw_mode
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fd = sys.stdin.fileno()
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prev_tcgetattr = termios.tcgetattr(fd)
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ch = None
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try:
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tty.setraw(fd)
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in_raw_mode = True
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[i, o, e] = select.select([fd], [], [], 0.05)
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if i:
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ch = sys.stdin.read(1)
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finally:
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termios.tcsetattr(fd, termios.TCSADRAIN, prev_tcgetattr)
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in_raw_mode = False
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return ch
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def dpp_tag_read(tag):
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success = False
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for record in tag.ndef.records:
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print(record)
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print("record type " + record.type)
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if record.type == "application/vnd.wfa.dpp":
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summary("DPP HS tag - send to wpa_supplicant")
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success = dpp_hs_tag_read(record)
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break
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if isinstance(record, ndef.UriRecord):
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print("URI record: uri=" + record.uri)
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print("URI record: iri=" + record.iri)
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if record.iri.startswith("DPP:"):
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print("DPP URI")
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if not dpp_nfc_uri_process(record.iri):
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break
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success = True
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else:
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print("Ignore unknown URI")
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break
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if success:
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success_report("Tag read succeeded")
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return success
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def rdwr_connected_write_tag(tag):
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summary("Tag found - writing - " + str(tag))
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if not tag.ndef.is_writeable:
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print("Not a writable tag")
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return
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global dpp_tag_data
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if tag.ndef.capacity < len(dpp_tag_data):
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print("Not enough room for the message")
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return
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tag.ndef.records = dpp_tag_data
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success_report("Tag write succeeded")
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print("Done - remove tag")
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global only_one
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if only_one:
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global continue_loop
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continue_loop = False
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global dpp_sel_wait_remove
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return dpp_sel_wait_remove
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def write_nfc_uri(clf, wait_remove=True):
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print("Write NFC URI record")
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data = wpas_get_nfc_uri()
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if data is None:
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summary("Could not get NFC URI from wpa_supplicant")
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return
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global dpp_sel_wait_remove
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dpp_sel_wait_remove = wait_remove
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print("URI: %s" % data)
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uri = ndef.UriRecord(data)
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print(uri)
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print("Touch an NFC tag")
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global dpp_tag_data
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dpp_tag_data = [uri]
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clf.connect(rdwr={'on-connect': rdwr_connected_write_tag})
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def write_nfc_hs(clf, wait_remove=True):
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print("Write NFC Handover Select record on a tag")
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data = wpas_get_nfc_uri()
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if data is None:
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summary("Could not get NFC URI from wpa_supplicant")
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return
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global dpp_sel_wait_remove
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dpp_sel_wait_remove = wait_remove
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print("URI: %s" % data)
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uri = ndef.UriRecord(data)
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print(uri)
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carrier = ndef.Record('application/vnd.wfa.dpp', 'A', uri.data)
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hs = ndef.HandoverSelectRecord('1.4')
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hs.add_alternative_carrier('active', carrier.name)
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print(hs)
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print(carrier)
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print("Touch an NFC tag")
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global dpp_tag_data
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dpp_tag_data = [hs, carrier]
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print(dpp_tag_data)
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clf.connect(rdwr={'on-connect': rdwr_connected_write_tag})
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def rdwr_connected(tag):
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global only_one, no_wait
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summary("Tag connected: " + str(tag))
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if tag.ndef:
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print("NDEF tag: " + tag.type)
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print(tag.ndef.records)
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success = dpp_tag_read(tag)
|
||||
if only_one and success:
|
||||
global continue_loop
|
||||
continue_loop = False
|
||||
else:
|
||||
summary("Not an NDEF tag - remove tag")
|
||||
return True
|
||||
|
||||
return not no_wait
|
||||
|
||||
def llcp_worker(llc):
|
||||
global init_on_touch
|
||||
if init_on_touch:
|
||||
print("Starting handover client")
|
||||
dpp_handover_client(llc)
|
||||
print("Exiting llcp_worker thread (init_in_touch)")
|
||||
return
|
||||
|
||||
global no_input
|
||||
if no_input:
|
||||
print("Wait for handover to complete")
|
||||
else:
|
||||
print("Wait for handover to complete - press 'i' to initiate")
|
||||
global srv
|
||||
global wait_connection
|
||||
while not wait_connection and srv.sent_carrier is None:
|
||||
if srv.ho_server_processing:
|
||||
time.sleep(0.025)
|
||||
elif no_input:
|
||||
time.sleep(0.5)
|
||||
else:
|
||||
res = getch()
|
||||
if res != 'i':
|
||||
continue
|
||||
clear_raw_mode()
|
||||
print("Starting handover client")
|
||||
dpp_handover_client(llc)
|
||||
print("Exiting llcp_worker thread (manual init)")
|
||||
return
|
||||
|
||||
clear_raw_mode()
|
||||
print("\rExiting llcp_worker thread")
|
||||
|
||||
def llcp_startup(llc):
|
||||
print("Start LLCP server")
|
||||
global srv
|
||||
srv = HandoverServer(llc)
|
||||
return llc
|
||||
|
||||
def llcp_connected(llc):
|
||||
print("P2P LLCP connected")
|
||||
global wait_connection
|
||||
wait_connection = False
|
||||
global init_on_touch
|
||||
if not init_on_touch:
|
||||
global srv
|
||||
srv.start()
|
||||
if init_on_touch or not no_input:
|
||||
threading.Thread(target=llcp_worker, args=(llc,)).start()
|
||||
return True
|
||||
|
||||
def llcp_release(llc):
|
||||
print("LLCP release")
|
||||
return True
|
||||
|
||||
def terminate_loop():
|
||||
global terminate_now
|
||||
return terminate_now
|
||||
|
||||
def main():
|
||||
clf = nfc.ContactlessFrontend()
|
||||
|
||||
parser = argparse.ArgumentParser(description='nfcpy to wpa_supplicant integration for DPP NFC operations')
|
||||
parser.add_argument('-d', const=logging.DEBUG, default=logging.INFO,
|
||||
action='store_const', dest='loglevel',
|
||||
help='verbose debug output')
|
||||
parser.add_argument('-q', const=logging.WARNING, action='store_const',
|
||||
dest='loglevel', help='be quiet')
|
||||
parser.add_argument('--only-one', '-1', action='store_true',
|
||||
help='run only one operation and exit')
|
||||
parser.add_argument('--init-on-touch', '-I', action='store_true',
|
||||
help='initiate handover on touch')
|
||||
parser.add_argument('--no-wait', action='store_true',
|
||||
help='do not wait for tag to be removed before exiting')
|
||||
parser.add_argument('--ifname', '-i',
|
||||
help='network interface name')
|
||||
parser.add_argument('--no-input', '-a', action='store_true',
|
||||
help='do not use stdout input to initiate handover')
|
||||
parser.add_argument('--tag-read-only', '-t', action='store_true',
|
||||
help='tag read only (do not allow connection handover)')
|
||||
parser.add_argument('--handover-only', action='store_true',
|
||||
help='connection handover only (do not allow tag read)')
|
||||
parser.add_argument('--summary',
|
||||
help='summary file for writing status updates')
|
||||
parser.add_argument('--success',
|
||||
help='success file for writing success update')
|
||||
parser.add_argument('--device', default='usb', help='NFC device to open')
|
||||
parser.add_argument('command', choices=['write-nfc-uri',
|
||||
'write-nfc-hs'],
|
||||
nargs='?')
|
||||
args = parser.parse_args()
|
||||
print(args)
|
||||
|
||||
global only_one
|
||||
only_one = args.only_one
|
||||
|
||||
global no_wait
|
||||
no_wait = args.no_wait
|
||||
|
||||
logging.basicConfig(level=args.loglevel)
|
||||
|
||||
global init_on_touch
|
||||
init_on_touch = args.init_on_touch
|
||||
|
||||
if args.ifname:
|
||||
global ifname
|
||||
ifname = args.ifname
|
||||
print("Selected ifname " + ifname)
|
||||
|
||||
if args.summary:
|
||||
global summary_file
|
||||
summary_file = args.summary
|
||||
|
||||
if args.success:
|
||||
global success_file
|
||||
success_file = args.success
|
||||
|
||||
if args.no_input:
|
||||
global no_input
|
||||
no_input = True
|
||||
|
||||
clf = nfc.ContactlessFrontend()
|
||||
global wait_connection
|
||||
|
||||
try:
|
||||
if not clf.open(args.device):
|
||||
print("Could not open connection with an NFC device")
|
||||
raise SystemExit
|
||||
|
||||
if args.command == "write-nfc-uri":
|
||||
write_nfc_uri(clf, wait_remove=not args.no_wait)
|
||||
raise SystemExit
|
||||
|
||||
if args.command == "write-nfc-hs":
|
||||
write_nfc_hs(clf, wait_remove=not args.no_wait)
|
||||
raise SystemExit
|
||||
|
||||
global continue_loop
|
||||
while continue_loop:
|
||||
clear_raw_mode()
|
||||
print("\rWaiting for a tag or peer to be touched")
|
||||
wait_connection = True
|
||||
try:
|
||||
if args.tag_read_only:
|
||||
if not clf.connect(rdwr={'on-connect': rdwr_connected}):
|
||||
break
|
||||
elif args.handover_only:
|
||||
if not clf.connect(llcp={'on-startup': llcp_startup,
|
||||
'on-connect': llcp_connected,
|
||||
'on-release': llcp_release},
|
||||
terminate=terminate_loop):
|
||||
break
|
||||
else:
|
||||
if not clf.connect(rdwr={'on-connect': rdwr_connected},
|
||||
llcp={'on-startup': llcp_startup,
|
||||
'on-connect': llcp_connected,
|
||||
'on-release': llcp_release},
|
||||
terminate=terminate_loop):
|
||||
break
|
||||
except Exception as e:
|
||||
print("clf.connect failed: " + str(e))
|
||||
break
|
||||
|
||||
global srv
|
||||
if only_one and srv and srv.success:
|
||||
raise SystemExit
|
||||
|
||||
except KeyboardInterrupt:
|
||||
raise SystemExit
|
||||
finally:
|
||||
clf.close()
|
||||
|
||||
raise SystemExit
|
||||
|
||||
if __name__ == '__main__':
|
||||
main()
|
||||
Loading…
Reference in a new issue