def auth(request, slot):
"""REST API endpoint for performing authentication against a USIM.
Expects a JSON body containing RAND and AUTN.
Returns a JSON body containing RES, CK, IK and Kc."""
try:
# there are two hex-string JSON parameters in the body: rand and autn
content = json.loads(request.content.read())
rand = content['rand']
autn = content['autn']
except:
request.setResponseCode(400)
return "Malformed Request"
try:
tp = PcscSimLink(slot, apdu_tracer=ApduPrintTracer())
tp.connect()
except ReaderError:
request.setResponseCode(404)
return "Specified SIM Slot doesn't exist"
except ProtocolError:
request.setResponseCode(500)
return "Error"
except NoCardError:
request.setResponseCode(410)
return "No SIM card inserted in slot"
scc = SimCardCommands(tp)
card = UsimCard(scc)
# this should be part of UsimCard, but FairewavesSIM breaks with that :/
scc.cla_byte = "00"
scc.sel_ctrl = "0004"
try:
card.read_aids()
card.select_adf_by_aid(adf='usim')
res, sw = scc.authenticate(rand, autn)
except SwMatchError as e:
request.setResponseCode(500)
return "Communication Error %s" % e
tp.disconnect()
return json.dumps(res, indent=4)
