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sysmo-usim-tool/sysmo_usimsjs1.py

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Gadgets to modify SYSMO USIM SJS1 parameters
(C) 2017 by Sysmocom s.f.m.c. GmbH
All Rights Reserved
Author: Philipp Maier
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
# Some gadgets to handle functions specific to Sysmo USIM SJS1. The gadgets are
# organized as a loose collection of python functions. Each function serves
# a specific task (e.g. modifiying the auth parameters). For each task two
# functions are implemented sysmo_usim_show_...() to inspect the data that is
# intended to be modified and sysmo_usim_write_...() to perform the actual
# modification task.
# Partial File tree:
# The following tree is incomplete, it just contains the propritary files we
# need to perform the tasks implemented below:
#
# [MF 0x3F00]
# |
# +--[DF_AUTH 0x7FCC]
# | |
# | +--[EF_AUTH 0x6F00]
# | |
# | +--[EF_MLNGC 0x6F01]
# |
# +--[DF_GSM 0x7F20]
# |
# +--[EF_OPC 0x00F7]
# |
# +--[EF_KI 0x00FF]
import sys
from card import *
from simcard import *
from utils import *
# Files (propritary)
SYSMO_USIMSJS1_EF_KI = [0x00, 0xFF]
SYSMO_USIMSJS1_EF_OPC = [0x00, 0xF7]
SYSMO_USIMSJS1_DF_AUTH = [0x7F, 0xCC] #FIXME: Manual does not mention name, just called it "DF_AUTH" might be wrong!
SYSMO_USIMSJS1_EF_AUTH = [0x6F, 0x00]
SYSMO_USIMSJS1_EF_MLNGC = [0x6F, 0x01]
SYSMO_USIMSJS1_EF_SQNC = [0x00, 0xFB] # ADF.USIM
SYSMO_USIMSJS1_EF_SQNA = [0x00, 0xFA] # ADF.USIM
SYSMO_USIMSJS1_EF_EFMLNG = [0x00, 0xFB] # ADF.USIM
SYSMO_USIMSJS1_EF_AC = [0x00, 0xFE] # ADF.USIM
# CHV Types
SYSMO_USIMSJS1_ADM1 = 0x0A
# Authentication algorithms (See sysmousim.pdf cap. 8.5)
SYSMO_USIMSJS1_ALGO_MILENAGE = 0x01
SYSMO_USIMSJS1_ALGO_COMP12V1 = 0x03
SYSMO_USIMSJS1_ALGO_XOR2G = 0x04
SYSMO_USIMSJS1_ALGO_COMP128V2 = 0x06
SYSMO_USIMSJS1_ALGO_COMP128V3 = 0x07
SYSMO_USIMSJS1_ALGO_XOR3G = 0x08
# Application identifier
SYSMO_USIM_AID = [0xa0, 0x00, 0x00, 0x00, 0x87, 0x10, 0x02]
# Default content of record No.1 in EF.DIR
SYSMO_USIM_EF_DIR_REC_1_CONTENT = [0x61, 0x19, 0x4f, 0x10] + SYSMO_USIM_AID + \
[0xff, 0xff, 0xff, 0xff, 0x89, 0x07, 0x09, 0x00, 0x00, 0x50, 0x05,
0x55, 0x53, 0x69, 0x6d, 0x31, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff]
# Abstraction for the file structure of EF.MLNGC, which holds the
# parameters of the milenage authentication algorithm
class SYSMO_USIMSJS1_FILE_EF_MLNGC:
# Default parameters, see also sysmousim-manual.pdf,
# cap. 8.6 "Milenage Configuration (Ci/Ri)
C1 = [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]
C2 = [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01]
C3 = [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02]
C4 = [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04]
C5 = [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08]
R1 = 0x40
R2 = 0x00
R3 = 0x20
R4 = 0x40
R5 = 0x60
def __init__(self, content = None):
if content == None:
return
if len(content) != 85:
return
self.C1 = content[0:16]
self.C2 = content[16:32]
self.C3 = content[32:48]
self.C4 = content[48:64]
self.C5 = content[64:80]
self.R1 = content[80]
self.R2 = content[81]
self.R3 = content[82]
self.R4 = content[83]
self.R5 = content[84]
def __str__(self):
dump = " C1: " + hexdump(self.C1) + "\n"
dump += " C2: " + hexdump(self.C2) + "\n"
dump += " C3: " + hexdump(self.C3) + "\n"
dump += " C4: " + hexdump(self.C4) + "\n"
dump += " C5: " + hexdump(self.C5) + "\n"
dump += " R1: " + str(hex(self.R1)) + "\n"
dump += " R2: " + str(hex(self.R2)) + "\n"
dump += " R3: " + str(hex(self.R3)) + "\n"
dump += " R4: " + str(hex(self.R4)) + "\n"
dump += " R5: " + str(hex(self.R5))
return dump
class SYSMO_USIMSJS1_FILE_EF_SQNC:
# Default parameters
ind_size_bits = 5
sqn_check_enabled = True
sqn_age_limit_enabled = False
sqn_max_delta_enabled = True
sqnms_offset = 0
max_delta = 2**28 << ind_size_bits
age_limit = 2**28 << ind_size_bits
def __init__(self, content = None):
if content == None:
return
if len(content) != 15:
raise ValueError("unexpected length of %u bytes", len(content))
self.ind_size_bits = content[0] & 0xf
self.sqn_check_enabled = bool(content[0] & 0x10)
self.sqn_age_limit_enabled = bool(content[0] & 0x20)
self.sqn_max_delta_enabled = bool(content[0] & 0x40)
self.sqnms_offset = list_to_int(content[1:3])/6
self.max_delta = list_to_int(content[3:9]) >> self.ind_size_bits
self.age_limit = list_to_int(content[9:15]) >> self.ind_size_bits
def __str__(self):
pfx = " "
dump = ""
dump += "%sIND (bits): %u\n" % (pfx, self.ind_size_bits)
dump += "%sSQN Check enabled: %u\n" % (pfx, self.sqn_check_enabled)
dump += "%sSQN Age Limit enabled: %u\n" % (pfx, self.sqn_age_limit_enabled)
dump += "%sSQN Max Delta enabled: %u\n" % (pfx, self.sqn_max_delta_enabled)
dump += "%sSQNms Offset (into SQN array): %u\n" % (pfx, self.sqnms_offset)
dump += "%sMax Delta: %u\n" % (pfx, self.max_delta)
dump += "%sAge Limit: %u\n" % (pfx, self.age_limit)
return dump
def encode(self):
out = list(range(0, 3))
out[0] = self.ind_size_bits & 0x0f
if self.sqn_check_enabled:
out[0] |= 0x10
if self.sqn_age_limit_enabled:
out[0] |= 0x20
if self.sqn_max_delta_enabled:
out[0] |= 0x40
out[1] = (self.sqnms_offset*6) & 0xff
out[2] = (self.sqnms_offset*6) >> 8
out += int_to_list(self.max_delta, 6)
out += int_to_list(self.age_limit, 6)
return out
class SYSMO_USIMSJS1_FILE_EF_SQNA:
seq_array = []
def __init__(self, content, ind = 5):
if content == None:
for i in range(0, 2**ind):
self.seq_array.append(0)
return
if len(content) != 6*(2**ind):
raise ValueError("unexpected length of %u bytes", len(content))
# read in the SEQ array
for i in range(0, 2**ind):
offset = 6*i;
self.seq_array.append(list_to_int(content[offset:offset+6]))
def __str__(self):
pfx = " "
dump = ""
for i in range(len(self.seq_array)):
dump += "%sSEQ[%03d]: %u\n" % (pfx, i, self.seq_array[i])
return dump
def encode(self):
out = []
for i in self.seq_array:
out += int_to_list(i, 6)
return out
# Initalize card (select master file)
def sysmo_usim_init(sim):
print " * Initalizing..."
sim.select(GSM_SIM_MF)
# Authenticate as administrator
def sysmo_usim_admin_auth(sim, adm1, force = False):
rc = True
rem_attemts = sim.chv_retrys(SYSMO_USIMSJS1_ADM1)
print " * Remaining attempts: " + str(rem_attemts)
# Stop if a decreased ADM1 retry counter is detected
if(rem_attemts < 3) and force == False:
print " * Error: Only two authentication attemts remaining, we don't"
print " want to risk another failed authentication attempt!"
print " (double check ADM1 and use option -f to override)"
return False
# Try to authenticate
try:
print " * Authenticating..."
sim.verify_chv(adm1, SYSMO_USIMSJS1_ADM1)
print " * Authentication successful"
except:
print " * Error: Authentication failed!"
rc = False
# Read back and display remaining attemts
rem_attemts = sim.chv_retrys(SYSMO_USIMSJS1_ADM1)
print " * Remaining attempts: " + str(rem_attemts)
return rc
sysmo_usim_algorithms = (
(1, 'MILENAGE'),
(3, 'COMP128v1'),
(4, 'XOR-2G'),
(5, 'GBA'),
(6, 'COMP128v2'),
(7, 'COMP128v3'),
(8, 'XOR-3G'),
(9, 'CIS-B'),
)
sysmo_usim_algorithms_dict_by_nr = dict(sysmo_usim_algorithms)
sysmo_usim_algorithms_dict_by_name = dict([(name.upper(), nr) for nr, name in sysmo_usim_algorithms])
def sysmo_usim_algo_to_str(alg_nr):
return sysmo_usim_algorithms_dict_by_nr.get(alg_nr) or 'INVALID'
def sysmo_usim_str_to_algo(alg_str):
alg_nr = sysmo_usim_algorithms_dict_by_name.get(alg_str.upper())
if alg_nr is None:
raise ValueError('Unknown Algorithm %s' % alg_str)
return alg_nr
# Show current athentication parameters
# (Which algorithim is used for which rat?)
def sysmo_usim_show_auth_params(sim):
sysmo_usim_init(sim)
print " * Reading..."
sim.select(SYSMO_USIMSJS1_DF_AUTH)
sim.select(SYSMO_USIMSJS1_EF_AUTH)
res = sim.read_binary(0x02)
algo_2g, algo_3g = res.apdu[:2]
print " * Current algorithm setting:"
print " 2G: %d=%s" % (algo_2g, sysmo_usim_algo_to_str(algo_2g))
print " 3G: %d=%s" % (algo_3g, sysmo_usim_algo_to_str(algo_3g))
# Program new authentication parameters
def sysmo_usim_write_auth_params(sim, algo_2g_str, algo_3g_str):
if algo_2g_str.isdigit():
algo_2g = int(algo_2g_str)
else:
algo_2g = sysmo_usim_str_to_algo(algo_2g_str)
if algo_3g_str.isdigit():
algo_3g = int(algo_2g_str)
else:
algo_3g = sysmo_usim_str_to_algo(algo_3g_str)
print " * New algorithm setting:"
print " 2G: %d=%s" % (algo_2g, sysmo_usim_algo_to_str(algo_2g))
print " 3G: %d=%s" % (algo_3g, sysmo_usim_algo_to_str(algo_3g))
sysmo_usim_init(sim)
print " * Programming..."
sim.select(SYSMO_USIMSJS1_DF_AUTH)
sim.select(SYSMO_USIMSJS1_EF_AUTH)
sim.update_binary([algo_2g,algo_3g])
def sysmo_usim_get_auth_counter(sim):
sim.select(SYSMO_USIMSJS1_EF_AC)
res = sim.read_binary(4, offset=0)
ctr = list_to_int(res.apdu[0:4])
if ctr == 0:
return "LOCKED"
elif ctr == 0xFFFFFFFF:
return "DISABLED"
else:
return ctr
def sysmo_usim_set_auth_counter(sim, ctr):
if ctr == "LOCKED":
ctr = 0
elif ctr == "DISABLED":
ctr = 0xFFFFFFFF
data = int_to_list(ctr, 4)
sim.select(SYSMO_USIMSJS1_EF_AC)
res = sim.update_binary(data, offset=0)
if ctr == 0:
return "LOCKED"
elif ctr == 0xFFFFFFFF:
return "DISABLED"
else:
return ctr
def sysmo_usim_read_milenage_sqn_params(sim):
sysmo_usim_init(sim)
sim.card.SELECT_ADF_USIM()
sim.select(SYSMO_USIMSJS1_EF_SQNC)
res = sim.read_binary(15, offset = 0)
ef_sqnc = SYSMO_USIMSJS1_FILE_EF_SQNC(res.apdu)
print " * Current SQN Configuration: "
print str(ef_sqnc)
# SQN Array
ind_pow = 2**ef_sqnc.ind_size_bits
sim.select(SYSMO_USIMSJS1_EF_SQNA)
res = sim.read_binary(ind_pow*6, offset=0)
ef_sqna = SYSMO_USIMSJS1_FILE_EF_SQNA(res.apdu)
print " * Current SQN Array: "
print str(ef_sqna)
auth_ctr = sysmo_usim_get_auth_counter(sim)
print "* Authentication Counter: %s\n" % auth_ctr
def sysmo_usim_reset_milenage_sqn_params(sim):
sysmo_usim_init(sim)
print " * Resetting SQN Configuration to defaults..."
sim.card.SELECT_ADF_USIM()
ef_sqnc = SYSMO_USIMSJS1_FILE_EF_SQNC(None)
sim.select(SYSMO_USIMSJS1_EF_SQNC)
res = sim.update_binary(ef_sqnc.encode())
ef_sqna = SYSMO_USIMSJS1_FILE_EF_SQNA(None, ef_sqnc.ind_size_bits)
sim.select(SYSMO_USIMSJS1_EF_SQNA)
res = sim.update_binary(ef_sqna.encode())
sysmo_usim_set_auth_counter(sim, "DISABLED")
# Show current milenage parameters
def sysmo_usim_show_milenage_params(sim):
sysmo_usim_init(sim)
sim.select(SYSMO_USIMSJS1_DF_AUTH)
sim.select(SYSMO_USIMSJS1_EF_MLNGC)
print " * Reading..."
ef_mlngc = SYSMO_USIMSJS1_FILE_EF_MLNGC()
res = sim.read_binary(16, offset = 0)
ef_mlngc.C1 = res.apdu
res = sim.read_binary(16, offset = 16)
ef_mlngc.C2 = res.apdu
res = sim.read_binary(16, offset = 32)
ef_mlngc.C3 = res.apdu
res = sim.read_binary(16, offset = 48)
ef_mlngc.C4 = res.apdu
res = sim.read_binary(16, offset = 64)
ef_mlngc.C5 = res.apdu
res = sim.read_binary(1, offset = 80)
ef_mlngc.R1 = res.apdu[0]
res = sim.read_binary(1, offset = 81)
ef_mlngc.R2 = res.apdu[0]
res = sim.read_binary(1, offset = 82)
ef_mlngc.R3 = res.apdu[0]
res = sim.read_binary(1, offset = 83)
ef_mlngc.R4 = res.apdu[0]
res = sim.read_binary(1, offset = 84)
ef_mlngc.R5 = res.apdu[0]
print " * Current Milenage Parameters in (EF.MLNGC):"
print str(ef_mlngc)
# Write new milenage parameters
def sysmo_usim_write_milenage_params(sim, ef_mlngc):
sysmo_usim_init(sim)
print " * New Milenage Parameters for (EF.MLNGC):"
print str(ef_mlngc)
sim.select(SYSMO_USIMSJS1_DF_AUTH)
sim.select(SYSMO_USIMSJS1_EF_MLNGC)
print " * Programming..."
sim.update_binary(ef_mlngc.C1, offset = 0)
sim.update_binary(ef_mlngc.C2, offset = 16)
sim.update_binary(ef_mlngc.C3, offset = 32)
sim.update_binary(ef_mlngc.C4, offset = 48)
sim.update_binary(ef_mlngc.C5, offset = 64)
sim.update_binary([ef_mlngc.R1], offset = 80)
sim.update_binary([ef_mlngc.R2], offset = 81)
sim.update_binary([ef_mlngc.R3], offset = 82)
sim.update_binary([ef_mlngc.R4], offset = 83)
sim.update_binary([ef_mlngc.R5], offset = 84)
def sysmo_usim_opcmode2str(mode):
if mode == 1:
return 'OPc'
elif mode == 0:
return 'OP'
else:
raise ValueError('Unknown Mode ', mode)
# Show current OPc value
def sysmo_usim_show_opc_params(sim):
sysmo_usim_init(sim)
print " * Reading..."
sim.card.SELECT_ADF_USIM()
sim.select(SYSMO_USIMSJS1_EF_OPC)
res = sim.read_binary(17)
mode_str = sysmo_usim_opcmode2str(res.apdu[0])
print " * Current OP/OPc setting:"
print " %s: %s" % (mode_str, hexdump(res.apdu[1:]))
# Program new OPc value
def sysmo_usim_write_opc_params(sim, select, op):
print " * New OPc setting:"
print " %s: %s" % (sysmo_usim_opcmode2str(select), hexdump(op))
print " OP/OPc: " + hexdump(op)
sysmo_usim_init(sim)
sim.select(GSM_SIM_DF_GSM)
sim.select(SYSMO_USIMSJS1_EF_OPC)
print " * Programming..."
sim.update_binary([select] + op)
# Show current KI value
def sysmo_usim_show_ki_params(sim):
sysmo_usim_init(sim)
print " * Reading..."
sim.select(GSM_SIM_DF_GSM)
sim.select(SYSMO_USIMSJS1_EF_KI)
res = sim.read_binary(16)
print " * Current KI setting:"
print " KI: " + hexdump(res.apdu)
# Program new KI value
def sysmo_usim_write_ki_params(sim, ki):
print " * New KI setting:"
print " KI: " + hexdump(ki)
sysmo_usim_init(sim)
sim.select(GSM_SIM_DF_GSM)
sim.select(SYSMO_USIMSJS1_EF_KI)
print " * Programming..."
sim.update_binary(ki)
# Show the enable status of the USIM application (app is enabled or disabled?)
def sysmo_usim_show_usim_status(sim):
sysmo_usim_init(sim)
print " * Reading..."
sim.select(GSM_USIM_EF_DIR)
res = sim.read_record(0x26, rec_no = 1)
print " * Current status of Record No.1 in EF.DIR:"
print " " + hexdump(res.apdu)
# Show the enable status of the USIM application (app is enabled or disabled?)
def sysmo_usim_show_sim_mode(sim):
sysmo_usim_init(sim)
print " * Reading..."
sim.select(GSM_USIM_EF_DIR)
res = sim.read_record(0x26, rec_no = 1)
print " * Current status of Record No. 1 in EF.DIR:"
print " " + hexdump(res.apdu)
if hexdump(SYSMO_USIM_AID) in hexdump(res.apdu):
print " ==> USIM application enabled"
else:
print " ==> USIM application disabled"
# Show the enable status of the USIM application (app is enabled or disabled?)
def sysmo_usim_write_sim_mode(sim, usim_enabled = True):
if usim_enabled:
new_record = SYSMO_USIM_EF_DIR_REC_1_CONTENT
else:
new_record = [0xFF] * len(SYSMO_USIM_EF_DIR_REC_1_CONTENT)
print " * New status of Record No.1 in EF.DIR:"
print " " + hexdump(new_record)
if hexdump(SYSMO_USIM_AID) in hexdump(new_record):
print " ==> USIM application enabled"
else:
print " ==> USIM application disabled"
sysmo_usim_init(sim)
print " * Programming..."
sim.select(GSM_USIM_EF_DIR)
sim.update_record(new_record, rec_no = 1)
# Show current ICCID value
def sysmo_usim_show_iccid(sim):
sysmo_usim_init(sim)
print " * Reading..."
sim.select(GSM_SIM_EF_ICCID)
res = sim.read_binary(10)
print " * Current ICCID setting:"
print " ICCID: " + hexdump(swap_nibbles(res.apdu))
# Program new ICCID value
def sysmo_usim_write_iccid(sim, iccid):
print " * New ICCID setting:"
print " ICCID: " + hexdump(iccid)
sysmo_usim_init(sim)
sim.select(GSM_SIM_EF_ICCID)
print " * Programming..."
sim.update_binary(swap_nibbles(iccid))
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