Harald Welte | c781ab8 | 2021-05-23 11:50:19 +0200 | [diff] [blame] | 1 | #!/usr/bin/env python3 |
| 2 | |
| 3 | # RESTful HTTP service for performing authentication against USIM cards |
| 4 | # |
| 5 | # (C) 2021 by Harald Welte <laforge@osmocom.org> |
| 6 | # |
| 7 | # This program is free software: you can redistribute it and/or modify |
| 8 | # it under the terms of the GNU General Public License as published by |
| 9 | # the Free Software Foundation, either version 2 of the License, or |
| 10 | # (at your option) any later version. |
| 11 | # |
| 12 | # This program is distributed in the hope that it will be useful, |
| 13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | # GNU General Public License for more details. |
| 16 | # |
| 17 | # You should have received a copy of the GNU General Public License |
| 18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | |
| 20 | import json |
| 21 | import sys |
| 22 | import argparse |
| 23 | |
| 24 | from klein import run, route |
| 25 | |
| 26 | from pySim.transport import ApduTracer |
| 27 | from pySim.transport.pcsc import PcscSimLink |
| 28 | from pySim.commands import SimCardCommands |
| 29 | from pySim.cards import UsimCard |
| 30 | from pySim.exceptions import * |
| 31 | |
| 32 | class ApduPrintTracer(ApduTracer): |
| 33 | def trace_response(self, cmd, sw, resp): |
| 34 | #print("CMD: %s -> RSP: %s %s" % (cmd, sw, resp)) |
| 35 | pass |
| 36 | |
| 37 | @route('/sim-auth-api/v1/slot/<int:slot>') |
| 38 | def auth(request, slot): |
| 39 | """REST API endpoint for performing authentication against a USIM. |
| 40 | Expects a JSON body containing RAND and AUTN. |
| 41 | Returns a JSON body containing RES, CK, IK and Kc.""" |
| 42 | try: |
| 43 | # there are two hex-string JSON parameters in the body: rand and autn |
| 44 | content = json.loads(request.content.read()) |
| 45 | rand = content['rand'] |
| 46 | autn = content['autn'] |
| 47 | except: |
| 48 | request.setResponseCode(400) |
| 49 | return "Malformed Request" |
| 50 | |
| 51 | try: |
| 52 | tp = PcscSimLink(slot, apdu_tracer=ApduPrintTracer()) |
| 53 | tp.connect() |
| 54 | except ReaderError: |
| 55 | request.setResponseCode(404) |
| 56 | return "Specified SIM Slot doesn't exist" |
| 57 | except ProtocolError: |
| 58 | request.setResponseCode(500) |
| 59 | return "Error" |
| 60 | except NoCardError: |
| 61 | request.setResponseCode(410) |
| 62 | return "No SIM card inserted in slot" |
| 63 | |
| 64 | scc = SimCardCommands(tp) |
| 65 | card = UsimCard(scc) |
| 66 | # this should be part of UsimCard, but FairewavesSIM breaks with that :/ |
| 67 | scc.cla_byte = "00" |
| 68 | scc.sel_ctrl = "0004" |
| 69 | try: |
| 70 | card.read_aids() |
| 71 | card.select_adf_by_aid(adf='usim') |
| 72 | res, sw = scc.authenticate(rand, autn) |
| 73 | except SwMatchError as e: |
| 74 | request.setResponseCode(500) |
| 75 | return "Communication Error %s" % e |
| 76 | |
| 77 | tp.disconnect() |
| 78 | |
| 79 | return json.dumps(res, indent=4) |
| 80 | |
| 81 | def main(argv): |
| 82 | parser = argparse.ArgumentParser() |
| 83 | parser.add_argument("-H", "--host", help="Host/IP to bind HTTP to", default="localhost") |
| 84 | parser.add_argument("-p", "--port", help="TCP port to bind HTTP to", default=8000) |
| 85 | #parser.add_argument("-v", "--verbose", help="increase output verbosity", action='count', default=0) |
| 86 | |
| 87 | args = parser.parse_args() |
| 88 | |
| 89 | run(args.host, args.port) |
| 90 | |
| 91 | if __name__ == "__main__": |
| 92 | main(sys.argv) |