Sylvain Munaut | 76504e0 | 2010-12-07 00:24:32 +0100 | [diff] [blame] | 1 | # -*- coding: utf-8 -*- |
| 2 | |
| 3 | """ pySim: various utilities |
| 4 | """ |
| 5 | |
| 6 | # |
| 7 | # Copyright (C) 2009-2010 Sylvain Munaut <tnt@246tNt.com> |
| 8 | # |
| 9 | # This program is free software: you can redistribute it and/or modify |
| 10 | # it under the terms of the GNU General Public License as published by |
| 11 | # the Free Software Foundation, either version 2 of the License, or |
| 12 | # (at your option) any later version. |
| 13 | # |
| 14 | # This program is distributed in the hope that it will be useful, |
| 15 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | # GNU General Public License for more details. |
| 18 | # |
| 19 | # You should have received a copy of the GNU General Public License |
| 20 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 21 | # |
| 22 | |
| 23 | |
Harald Welte | ee3501f | 2021-04-02 13:00:18 +0200 | [diff] [blame] | 24 | def h2b(s: str) -> bytearray: |
Harald Welte | 4f6ca43 | 2021-02-01 17:51:56 +0100 | [diff] [blame] | 25 | """convert from a string of hex nibbles to a sequence of bytes""" |
| 26 | return bytearray.fromhex(s) |
Sylvain Munaut | 76504e0 | 2010-12-07 00:24:32 +0100 | [diff] [blame] | 27 | |
Harald Welte | ee3501f | 2021-04-02 13:00:18 +0200 | [diff] [blame] | 28 | def b2h(b: bytearray) -> str: |
Harald Welte | 4f6ca43 | 2021-02-01 17:51:56 +0100 | [diff] [blame] | 29 | """convert from a sequence of bytes to a string of hex nibbles""" |
| 30 | return ''.join(['%02x'%(x) for x in b]) |
Sylvain Munaut | 76504e0 | 2010-12-07 00:24:32 +0100 | [diff] [blame] | 31 | |
Harald Welte | ee3501f | 2021-04-02 13:00:18 +0200 | [diff] [blame] | 32 | def h2i(s:str): |
| 33 | """convert from a string of hex nibbles to a list of integers""" |
Sylvain Munaut | 76504e0 | 2010-12-07 00:24:32 +0100 | [diff] [blame] | 34 | return [(int(x,16)<<4)+int(y,16) for x,y in zip(s[0::2], s[1::2])] |
| 35 | |
Harald Welte | ee3501f | 2021-04-02 13:00:18 +0200 | [diff] [blame] | 36 | def i2h(s) -> str: |
| 37 | """convert from a list of integers to a string of hex nibbles""" |
Sylvain Munaut | 76504e0 | 2010-12-07 00:24:32 +0100 | [diff] [blame] | 38 | return ''.join(['%02x'%(x) for x in s]) |
| 39 | |
Harald Welte | ee3501f | 2021-04-02 13:00:18 +0200 | [diff] [blame] | 40 | def h2s(s:str) -> str: |
| 41 | """convert from a string of hex nibbles to an ASCII string""" |
Vadim Yanitskiy | eb06b45 | 2020-05-10 02:32:46 +0700 | [diff] [blame] | 42 | return ''.join([chr((int(x,16)<<4)+int(y,16)) for x,y in zip(s[0::2], s[1::2]) |
| 43 | if int(x + y, 16) != 0xff]) |
Alexander Chemeris | a5f0ea6 | 2017-07-18 16:48:47 +0300 | [diff] [blame] | 44 | |
Harald Welte | ee3501f | 2021-04-02 13:00:18 +0200 | [diff] [blame] | 45 | def s2h(s:str) -> str: |
| 46 | """convert from an ASCII string to a string of hex nibbles""" |
Harald Welte | 4f6ca43 | 2021-02-01 17:51:56 +0100 | [diff] [blame] | 47 | b = bytearray() |
| 48 | b.extend(map(ord, s)) |
| 49 | return b2h(b) |
Alexander Chemeris | a5f0ea6 | 2017-07-18 16:48:47 +0300 | [diff] [blame] | 50 | |
Supreeth Herle | 7d77d2d | 2020-05-11 09:07:08 +0200 | [diff] [blame] | 51 | # List of bytes to string |
Harald Welte | ee3501f | 2021-04-02 13:00:18 +0200 | [diff] [blame] | 52 | def i2s(s) -> str: |
| 53 | """convert from a list of integers to an ASCII string""" |
Supreeth Herle | 7d77d2d | 2020-05-11 09:07:08 +0200 | [diff] [blame] | 54 | return ''.join([chr(x) for x in s]) |
| 55 | |
Harald Welte | ee3501f | 2021-04-02 13:00:18 +0200 | [diff] [blame] | 56 | def swap_nibbles(s:str) -> str: |
| 57 | """swap the nibbles in a hex string""" |
Sylvain Munaut | 76504e0 | 2010-12-07 00:24:32 +0100 | [diff] [blame] | 58 | return ''.join([x+y for x,y in zip(s[1::2], s[0::2])]) |
| 59 | |
Harald Welte | ee3501f | 2021-04-02 13:00:18 +0200 | [diff] [blame] | 60 | def rpad(s:str, l:int, c='f') -> str: |
| 61 | """pad string on the right side. |
| 62 | Args: |
| 63 | s : string to pad |
| 64 | l : total length to pad to |
| 65 | c : padding character |
| 66 | Returns: |
| 67 | String 's' padded with as many 'c' as needed to reach total length of 'l' |
| 68 | """ |
Sylvain Munaut | 76504e0 | 2010-12-07 00:24:32 +0100 | [diff] [blame] | 69 | return s + c * (l - len(s)) |
| 70 | |
Harald Welte | ee3501f | 2021-04-02 13:00:18 +0200 | [diff] [blame] | 71 | def lpad(s:str, l:int, c='f') -> str: |
| 72 | """pad string on the left side. |
| 73 | Args: |
| 74 | s : string to pad |
| 75 | l : total length to pad to |
| 76 | c : padding character |
| 77 | Returns: |
| 78 | String 's' padded with as many 'c' as needed to reach total length of 'l' |
| 79 | """ |
Sylvain Munaut | 76504e0 | 2010-12-07 00:24:32 +0100 | [diff] [blame] | 80 | return c * (l - len(s)) + s |
Alexander Chemeris | 5e96c3d | 2013-07-04 17:33:33 +0400 | [diff] [blame] | 81 | |
Harald Welte | ee3501f | 2021-04-02 13:00:18 +0200 | [diff] [blame] | 82 | def half_round_up(n:int) -> int: |
Ben Fox-Moore | 0ec1475 | 2018-09-24 15:47:02 +0200 | [diff] [blame] | 83 | return (n + 1)//2 |
| 84 | |
| 85 | # IMSI encoded format: |
| 86 | # For IMSI 0123456789ABCDE: |
| 87 | # |
| 88 | # | byte 1 | 2 upper | 2 lower | 3 upper | 3 lower | ... | 9 upper | 9 lower | |
| 89 | # | length in bytes | 0 | odd/even | 2 | 1 | ... | E | D | |
| 90 | # |
| 91 | # If the IMSI is less than 15 characters, it should be padded with 'f' from the end. |
| 92 | # |
| 93 | # The length is the total number of bytes used to encoded the IMSI. This includes the odd/even |
| 94 | # parity bit. E.g. an IMSI of length 14 is 8 bytes long, not 7, as it uses bytes 2 to 9 to |
| 95 | # encode itself. |
| 96 | # |
| 97 | # Because of this, an odd length IMSI fits exactly into len(imsi) + 1 // 2 bytes, whereas an |
| 98 | # even length IMSI only uses half of the last byte. |
| 99 | |
Harald Welte | ee3501f | 2021-04-02 13:00:18 +0200 | [diff] [blame] | 100 | def enc_imsi(imsi:str): |
| 101 | """Converts a string IMSI into the encoded value of the EF""" |
Ben Fox-Moore | 0ec1475 | 2018-09-24 15:47:02 +0200 | [diff] [blame] | 102 | l = half_round_up(len(imsi) + 1) # Required bytes - include space for odd/even indicator |
Alexander Chemeris | 7be92ff | 2013-07-10 11:18:06 +0400 | [diff] [blame] | 103 | oe = len(imsi) & 1 # Odd (1) / Even (0) |
Ben Fox-Moore | 0ec1475 | 2018-09-24 15:47:02 +0200 | [diff] [blame] | 104 | ei = '%02x' % l + swap_nibbles('%01x%s' % ((oe<<3)|1, rpad(imsi, 15))) |
Alexander Chemeris | 7be92ff | 2013-07-10 11:18:06 +0400 | [diff] [blame] | 105 | return ei |
| 106 | |
Alexander Chemeris | 5e96c3d | 2013-07-04 17:33:33 +0400 | [diff] [blame] | 107 | def dec_imsi(ef): |
| 108 | """Converts an EF value to the imsi string representation""" |
| 109 | if len(ef) < 4: |
| 110 | return None |
Pau Espin Pedrol | 665bd22 | 2017-12-29 20:30:35 +0100 | [diff] [blame] | 111 | l = int(ef[0:2], 16) * 2 # Length of the IMSI string |
Ben Fox-Moore | 0ec1475 | 2018-09-24 15:47:02 +0200 | [diff] [blame] | 112 | l = l - 1 # Encoded length byte includes oe nibble |
| 113 | swapped = swap_nibbles(ef[2:]).rstrip('f') |
Philipp Maier | cd3d626 | 2020-05-11 21:41:56 +0200 | [diff] [blame] | 114 | if len(swapped) < 1: |
| 115 | return None |
Alexander Chemeris | 5e96c3d | 2013-07-04 17:33:33 +0400 | [diff] [blame] | 116 | oe = (int(swapped[0])>>3) & 1 # Odd (1) / Even (0) |
Ben Fox-Moore | 0ec1475 | 2018-09-24 15:47:02 +0200 | [diff] [blame] | 117 | if not oe: |
| 118 | # if even, only half of last byte was used |
Alexander Chemeris | 5e96c3d | 2013-07-04 17:33:33 +0400 | [diff] [blame] | 119 | l = l-1 |
Ben Fox-Moore | 0ec1475 | 2018-09-24 15:47:02 +0200 | [diff] [blame] | 120 | if l != len(swapped) - 1: |
Alexander Chemeris | 5e96c3d | 2013-07-04 17:33:33 +0400 | [diff] [blame] | 121 | return None |
Ben Fox-Moore | 0ec1475 | 2018-09-24 15:47:02 +0200 | [diff] [blame] | 122 | imsi = swapped[1:] |
Alexander Chemeris | 5e96c3d | 2013-07-04 17:33:33 +0400 | [diff] [blame] | 123 | return imsi |
| 124 | |
| 125 | def dec_iccid(ef): |
| 126 | return swap_nibbles(ef).strip('f') |
Alexander Chemeris | 7be92ff | 2013-07-10 11:18:06 +0400 | [diff] [blame] | 127 | |
| 128 | def enc_iccid(iccid): |
| 129 | return swap_nibbles(rpad(iccid, 20)) |
| 130 | |
| 131 | def enc_plmn(mcc, mnc): |
Alexander Chemeris | dddbf52 | 2017-07-18 16:49:59 +0300 | [diff] [blame] | 132 | """Converts integer MCC/MNC into 3 bytes for EF""" |
Harald Welte | 7f1d3c4 | 2020-05-12 21:12:44 +0200 | [diff] [blame] | 133 | if len(mnc) == 2: |
Vadim Yanitskiy | c8458e2 | 2021-03-12 00:34:10 +0100 | [diff] [blame] | 134 | mnc += "F" # pad to 3 digits if needed |
| 135 | return (mcc[1] + mcc[0]) + (mnc[2] + mcc[2]) + (mnc[1] + mnc[0]) |
Alexander Chemeris | a5f0ea6 | 2017-07-18 16:48:47 +0300 | [diff] [blame] | 136 | |
| 137 | def dec_spn(ef): |
| 138 | byte1 = int(ef[0:2]) |
| 139 | hplmn_disp = (byte1&0x01 == 0x01) |
| 140 | oplmn_disp = (byte1&0x02 == 0x02) |
| 141 | name = h2s(ef[2:]) |
| 142 | return (name, hplmn_disp, oplmn_disp) |
| 143 | |
| 144 | def enc_spn(name, hplmn_disp=False, oplmn_disp=False): |
| 145 | byte1 = 0x00 |
| 146 | if hplmn_disp: byte1 = byte1|0x01 |
| 147 | if oplmn_disp: byte1 = byte1|0x02 |
| 148 | return i2h([byte1])+s2h(name) |
Alexander Chemeris | 19fffa1 | 2018-01-11 13:06:43 +0900 | [diff] [blame] | 149 | |
Supreeth Herle | f394853 | 2020-03-24 12:23:51 +0100 | [diff] [blame] | 150 | def hexstr_to_Nbytearr(s, nbytes): |
| 151 | return [s[i:i+(nbytes*2)] for i in range(0, len(s), (nbytes*2)) ] |
| 152 | |
Daniel Laszlo Sitzer | 851e9c0 | 2018-12-04 19:40:08 +0100 | [diff] [blame] | 153 | # Accepts hex string representing three bytes |
| 154 | def dec_mcc_from_plmn(plmn): |
| 155 | ia = h2i(plmn) |
| 156 | digit1 = ia[0] & 0x0F # 1st byte, LSB |
| 157 | digit2 = (ia[0] & 0xF0) >> 4 # 1st byte, MSB |
| 158 | digit3 = ia[1] & 0x0F # 2nd byte, LSB |
| 159 | if digit3 == 0xF and digit2 == 0xF and digit1 == 0xF: |
| 160 | return 0xFFF # 4095 |
Supreeth Herle | d24f163 | 2019-11-30 10:37:09 +0100 | [diff] [blame] | 161 | return derive_mcc(digit1, digit2, digit3) |
Daniel Laszlo Sitzer | 851e9c0 | 2018-12-04 19:40:08 +0100 | [diff] [blame] | 162 | |
| 163 | def dec_mnc_from_plmn(plmn): |
| 164 | ia = h2i(plmn) |
Vadim Yanitskiy | b271be3 | 2021-03-11 23:56:58 +0100 | [diff] [blame] | 165 | digit1 = ia[2] & 0x0F # 3rd byte, LSB |
| 166 | digit2 = (ia[2] & 0xF0) >> 4 # 3rd byte, MSB |
| 167 | digit3 = (ia[1] & 0xF0) >> 4 # 2nd byte, MSB |
Daniel Laszlo Sitzer | 851e9c0 | 2018-12-04 19:40:08 +0100 | [diff] [blame] | 168 | if digit3 == 0xF and digit2 == 0xF and digit1 == 0xF: |
| 169 | return 0xFFF # 4095 |
Supreeth Herle | d24f163 | 2019-11-30 10:37:09 +0100 | [diff] [blame] | 170 | return derive_mnc(digit1, digit2, digit3) |
Daniel Laszlo Sitzer | 851e9c0 | 2018-12-04 19:40:08 +0100 | [diff] [blame] | 171 | |
| 172 | def dec_act(twohexbytes): |
| 173 | act_list = [ |
| 174 | {'bit': 15, 'name': "UTRAN"}, |
| 175 | {'bit': 14, 'name': "E-UTRAN"}, |
| 176 | {'bit': 7, 'name': "GSM"}, |
| 177 | {'bit': 6, 'name': "GSM COMPACT"}, |
| 178 | {'bit': 5, 'name': "cdma2000 HRPD"}, |
| 179 | {'bit': 4, 'name': "cdma2000 1xRTT"}, |
| 180 | ] |
| 181 | ia = h2i(twohexbytes) |
| 182 | u16t = (ia[0] << 8)|ia[1] |
| 183 | sel = [] |
| 184 | for a in act_list: |
| 185 | if u16t & (1 << a['bit']): |
| 186 | sel.append(a['name']) |
| 187 | return sel |
| 188 | |
| 189 | def dec_xplmn_w_act(fivehexbytes): |
| 190 | res = {'mcc': 0, 'mnc': 0, 'act': []} |
| 191 | plmn_chars = 6 |
| 192 | act_chars = 4 |
| 193 | plmn_str = fivehexbytes[:plmn_chars] # first three bytes (six ascii hex chars) |
| 194 | act_str = fivehexbytes[plmn_chars:plmn_chars + act_chars] # two bytes after first three bytes |
| 195 | res['mcc'] = dec_mcc_from_plmn(plmn_str) |
| 196 | res['mnc'] = dec_mnc_from_plmn(plmn_str) |
| 197 | res['act'] = dec_act(act_str) |
| 198 | return res |
| 199 | |
| 200 | def format_xplmn_w_act(hexstr): |
| 201 | s = "" |
herlesupreeth | 45fa604 | 2020-09-18 15:32:20 +0200 | [diff] [blame] | 202 | for rec_data in hexstr_to_Nbytearr(hexstr, 5): |
Daniel Laszlo Sitzer | 851e9c0 | 2018-12-04 19:40:08 +0100 | [diff] [blame] | 203 | rec_info = dec_xplmn_w_act(rec_data) |
| 204 | if rec_info['mcc'] == 0xFFF and rec_info['mnc'] == 0xFFF: |
| 205 | rec_str = "unused" |
| 206 | else: |
Supreeth Herle | d24f163 | 2019-11-30 10:37:09 +0100 | [diff] [blame] | 207 | rec_str = "MCC: %03d MNC: %03d AcT: %s" % (rec_info['mcc'], rec_info['mnc'], ", ".join(rec_info['act'])) |
Daniel Laszlo Sitzer | 851e9c0 | 2018-12-04 19:40:08 +0100 | [diff] [blame] | 208 | s += "\t%s # %s\n" % (rec_data, rec_str) |
| 209 | return s |
| 210 | |
Sebastian Viviani | e61170c | 2020-06-03 08:57:00 +0100 | [diff] [blame] | 211 | def dec_loci(hexstr): |
| 212 | res = {'tmsi': '', 'mcc': 0, 'mnc': 0, 'lac': '', 'status': 0} |
| 213 | res['tmsi'] = hexstr[:8] |
| 214 | res['mcc'] = dec_mcc_from_plmn(hexstr[8:14]) |
| 215 | res['mnc'] = dec_mnc_from_plmn(hexstr[8:14]) |
| 216 | res['lac'] = hexstr[14:18] |
| 217 | res['status'] = h2i(hexstr[20:22]) |
| 218 | return res |
| 219 | |
| 220 | def dec_psloci(hexstr): |
| 221 | res = {'p-tmsi': '', 'p-tmsi-sig': '', 'mcc': 0, 'mnc': 0, 'lac': '', 'rac': '', 'status': 0} |
| 222 | res['p-tmsi'] = hexstr[:8] |
| 223 | res['p-tmsi-sig'] = hexstr[8:14] |
| 224 | res['mcc'] = dec_mcc_from_plmn(hexstr[14:20]) |
| 225 | res['mnc'] = dec_mnc_from_plmn(hexstr[14:20]) |
| 226 | res['lac'] = hexstr[20:24] |
| 227 | res['rac'] = hexstr[24:26] |
| 228 | res['status'] = h2i(hexstr[26:28]) |
| 229 | return res |
| 230 | |
| 231 | def dec_epsloci(hexstr): |
| 232 | res = {'guti': '', 'mcc': 0, 'mnc': 0, 'tac': '', 'status': 0} |
| 233 | res['guti'] = hexstr[:24] |
| 234 | res['tai'] = hexstr[24:34] |
| 235 | res['mcc'] = dec_mcc_from_plmn(hexstr[24:30]) |
| 236 | res['mnc'] = dec_mnc_from_plmn(hexstr[24:30]) |
| 237 | res['tac'] = hexstr[30:34] |
| 238 | res['status'] = h2i(hexstr[34:36]) |
| 239 | return res |
| 240 | |
Harald Welte | ca67394 | 2020-06-03 15:19:40 +0200 | [diff] [blame] | 241 | def dec_xplmn(threehexbytes): |
| 242 | res = {'mcc': 0, 'mnc': 0, 'act': []} |
| 243 | plmn_chars = 6 |
| 244 | plmn_str = threehexbytes[:plmn_chars] # first three bytes (six ascii hex chars) |
| 245 | res['mcc'] = dec_mcc_from_plmn(plmn_str) |
| 246 | res['mnc'] = dec_mnc_from_plmn(plmn_str) |
| 247 | return res |
| 248 | |
| 249 | def format_xplmn(hexstr): |
| 250 | s = "" |
herlesupreeth | 45fa604 | 2020-09-18 15:32:20 +0200 | [diff] [blame] | 251 | for rec_data in hexstr_to_Nbytearr(hexstr, 3): |
Harald Welte | ca67394 | 2020-06-03 15:19:40 +0200 | [diff] [blame] | 252 | rec_info = dec_xplmn(rec_data) |
| 253 | if rec_info['mcc'] == 0xFFF and rec_info['mnc'] == 0xFFF: |
| 254 | rec_str = "unused" |
| 255 | else: |
| 256 | rec_str = "MCC: %03d MNC: %03d" % (rec_info['mcc'], rec_info['mnc']) |
| 257 | s += "\t%s # %s\n" % (rec_data, rec_str) |
| 258 | return s |
| 259 | |
Alexander Chemeris | 19fffa1 | 2018-01-11 13:06:43 +0900 | [diff] [blame] | 260 | def derive_milenage_opc(ki_hex, op_hex): |
| 261 | """ |
| 262 | Run the milenage algorithm to calculate OPC from Ki and OP |
| 263 | """ |
| 264 | from Crypto.Cipher import AES |
| 265 | from Crypto.Util.strxor import strxor |
| 266 | from pySim.utils import b2h |
| 267 | |
| 268 | # We pass in hex string and now need to work on bytes |
Harald Welte | eab8d2a | 2021-03-05 18:30:23 +0100 | [diff] [blame] | 269 | ki_bytes = bytes(h2b(ki_hex)) |
| 270 | op_bytes = bytes(h2b(op_hex)) |
Harald Welte | ab34fa8 | 2021-03-05 18:39:59 +0100 | [diff] [blame] | 271 | aes = AES.new(ki_bytes, AES.MODE_ECB) |
Harald Welte | eab8d2a | 2021-03-05 18:30:23 +0100 | [diff] [blame] | 272 | opc_bytes = aes.encrypt(op_bytes) |
| 273 | return b2h(strxor(opc_bytes, op_bytes)) |
Alexander Chemeris | 19fffa1 | 2018-01-11 13:06:43 +0900 | [diff] [blame] | 274 | |
| 275 | def calculate_luhn(cc): |
| 276 | """ |
| 277 | Calculate Luhn checksum used in e.g. ICCID and IMEI |
| 278 | """ |
Daniel Willmann | dd014ea | 2020-10-19 10:35:11 +0200 | [diff] [blame] | 279 | num = list(map(int, str(cc))) |
Alexander Chemeris | 19fffa1 | 2018-01-11 13:06:43 +0900 | [diff] [blame] | 280 | check_digit = 10 - sum(num[-2::-2] + [sum(divmod(d * 2, 10)) for d in num[::-2]]) % 10 |
| 281 | return 0 if check_digit == 10 else check_digit |
Philipp Maier | 7592eee | 2019-09-12 13:03:23 +0200 | [diff] [blame] | 282 | |
| 283 | def mcc_from_imsi(imsi): |
| 284 | """ |
| 285 | Derive the MCC (Mobile Country Code) from the first three digits of an IMSI |
| 286 | """ |
| 287 | if imsi == None: |
| 288 | return None |
| 289 | |
| 290 | if len(imsi) > 3: |
| 291 | return imsi[:3] |
| 292 | else: |
| 293 | return None |
| 294 | |
| 295 | def mnc_from_imsi(imsi, long=False): |
| 296 | """ |
| 297 | Derive the MNC (Mobile Country Code) from the 4th to 6th digit of an IMSI |
| 298 | """ |
| 299 | if imsi == None: |
| 300 | return None |
| 301 | |
| 302 | if len(imsi) > 3: |
| 303 | if long: |
| 304 | return imsi[3:6] |
| 305 | else: |
| 306 | return imsi[3:5] |
| 307 | else: |
| 308 | return None |
Supreeth Herle | d24f163 | 2019-11-30 10:37:09 +0100 | [diff] [blame] | 309 | |
| 310 | def derive_mcc(digit1, digit2, digit3): |
| 311 | """ |
| 312 | Derive decimal representation of the MCC (Mobile Country Code) |
| 313 | from three given digits. |
| 314 | """ |
| 315 | |
| 316 | mcc = 0 |
| 317 | |
| 318 | if digit1 != 0x0f: |
| 319 | mcc += digit1 * 100 |
| 320 | if digit2 != 0x0f: |
| 321 | mcc += digit2 * 10 |
| 322 | if digit3 != 0x0f: |
| 323 | mcc += digit3 |
| 324 | |
| 325 | return mcc |
| 326 | |
| 327 | def derive_mnc(digit1, digit2, digit3=0x0f): |
| 328 | """ |
| 329 | Derive decimal representation of the MNC (Mobile Network Code) |
| 330 | from two or (optionally) three given digits. |
| 331 | """ |
| 332 | |
| 333 | mnc = 0 |
| 334 | |
| 335 | # 3-rd digit is optional for the MNC. If present |
| 336 | # the algorythm is the same as for the MCC. |
| 337 | if digit3 != 0x0f: |
| 338 | return derive_mcc(digit1, digit2, digit3) |
| 339 | |
| 340 | if digit1 != 0x0f: |
| 341 | mnc += digit1 * 10 |
| 342 | if digit2 != 0x0f: |
| 343 | mnc += digit2 |
| 344 | |
| 345 | return mnc |
Supreeth Herle | 4b1c763 | 2019-12-22 09:00:59 +0100 | [diff] [blame] | 346 | |
| 347 | def dec_msisdn(ef_msisdn): |
| 348 | """ |
| 349 | Decode MSISDN from EF.MSISDN or EF.ADN (same structure). |
| 350 | See 3GPP TS 31.102, section 4.2.26 and 4.4.2.3. |
| 351 | """ |
| 352 | |
| 353 | # Convert from str to (kind of) 'bytes' |
| 354 | ef_msisdn = h2b(ef_msisdn) |
| 355 | |
| 356 | # Make sure mandatory fields are present |
| 357 | if len(ef_msisdn) < 14: |
| 358 | raise ValueError("EF.MSISDN is too short") |
| 359 | |
| 360 | # Skip optional Alpha Identifier |
| 361 | xlen = len(ef_msisdn) - 14 |
| 362 | msisdn_lhv = ef_msisdn[xlen:] |
| 363 | |
| 364 | # Parse the length (in bytes) of the BCD encoded number |
Harald Welte | 4f6ca43 | 2021-02-01 17:51:56 +0100 | [diff] [blame] | 365 | bcd_len = msisdn_lhv[0] |
Supreeth Herle | 4b1c763 | 2019-12-22 09:00:59 +0100 | [diff] [blame] | 366 | # BCD length = length of dial num (max. 10 bytes) + 1 byte ToN and NPI |
| 367 | if bcd_len == 0xff: |
| 368 | return None |
| 369 | elif bcd_len > 11 or bcd_len < 1: |
| 370 | raise ValueError("Length of MSISDN (%d bytes) is out of range" % bcd_len) |
| 371 | |
| 372 | # Parse ToN / NPI |
Harald Welte | 4f6ca43 | 2021-02-01 17:51:56 +0100 | [diff] [blame] | 373 | ton = (msisdn_lhv[1] >> 4) & 0x07 |
| 374 | npi = msisdn_lhv[1] & 0x0f |
Supreeth Herle | 4b1c763 | 2019-12-22 09:00:59 +0100 | [diff] [blame] | 375 | bcd_len -= 1 |
| 376 | |
| 377 | # No MSISDN? |
| 378 | if not bcd_len: |
| 379 | return (npi, ton, None) |
| 380 | |
| 381 | msisdn = swap_nibbles(b2h(msisdn_lhv[2:][:bcd_len])).rstrip('f') |
| 382 | # International number 10.5.118/3GPP TS 24.008 |
Vadim Yanitskiy | 7ba2428 | 2020-02-27 00:04:13 +0700 | [diff] [blame] | 383 | if ton == 0x01: |
Supreeth Herle | 4b1c763 | 2019-12-22 09:00:59 +0100 | [diff] [blame] | 384 | msisdn = '+' + msisdn |
| 385 | |
| 386 | return (npi, ton, msisdn) |
Supreeth Herle | 5a54101 | 2019-12-22 08:59:16 +0100 | [diff] [blame] | 387 | |
| 388 | def enc_msisdn(msisdn, npi=0x01, ton=0x03): |
| 389 | """ |
| 390 | Encode MSISDN as LHV so it can be stored to EF.MSISDN. |
| 391 | See 3GPP TS 31.102, section 4.2.26 and 4.4.2.3. |
| 392 | |
| 393 | Default NPI / ToN values: |
| 394 | - NPI: ISDN / telephony numbering plan (E.164 / E.163), |
| 395 | - ToN: network specific or international number (if starts with '+'). |
| 396 | """ |
| 397 | |
| 398 | # Leading '+' indicates International Number |
| 399 | if msisdn[0] == '+': |
| 400 | msisdn = msisdn[1:] |
| 401 | ton = 0x01 |
| 402 | |
| 403 | # Append 'f' padding if number of digits is odd |
| 404 | if len(msisdn) % 2 > 0: |
| 405 | msisdn += 'f' |
| 406 | |
| 407 | # BCD length also includes NPI/ToN header |
| 408 | bcd_len = len(msisdn) // 2 + 1 |
| 409 | npi_ton = (npi & 0x0f) | ((ton & 0x07) << 4) | 0x80 |
| 410 | bcd = rpad(swap_nibbles(msisdn), 10 * 2) # pad to 10 octets |
| 411 | |
| 412 | return ('%02x' % bcd_len) + ('%02x' % npi_ton) + bcd |
Supreeth Herle | 441c4a7 | 2020-03-24 10:19:15 +0100 | [diff] [blame] | 413 | |
Supreeth Herle | 0c4d82d | 2020-04-20 13:28:31 +0200 | [diff] [blame] | 414 | def dec_st(st, table="sim"): |
| 415 | """ |
| 416 | Parses the EF S/U/IST and prints the list of available services in EF S/U/IST |
| 417 | """ |
| 418 | |
Supreeth Herle | df33037 | 2020-04-20 14:48:55 +0200 | [diff] [blame] | 419 | if table == "isim": |
| 420 | from pySim.ts_31_103 import EF_IST_map |
| 421 | lookup_map = EF_IST_map |
| 422 | elif table == "usim": |
Supreeth Herle | 0c4d82d | 2020-04-20 13:28:31 +0200 | [diff] [blame] | 423 | from pySim.ts_31_102 import EF_UST_map |
| 424 | lookup_map = EF_UST_map |
| 425 | else: |
| 426 | from pySim.ts_51_011 import EF_SST_map |
| 427 | lookup_map = EF_SST_map |
| 428 | |
| 429 | st_bytes = [st[i:i+2] for i in range(0, len(st), 2) ] |
| 430 | |
| 431 | avail_st = "" |
| 432 | # Get each byte and check for available services |
| 433 | for i in range(0, len(st_bytes)): |
| 434 | # Byte i contains info about Services num (8i+1) to num (8i+8) |
| 435 | byte = int(st_bytes[i], 16) |
| 436 | # Services in each byte are in order MSB to LSB |
| 437 | # MSB - Service (8i+8) |
| 438 | # LSB - Service (8i+1) |
| 439 | for j in range(1, 9): |
| 440 | if byte&0x01 == 0x01 and ((8*i) + j in lookup_map): |
| 441 | # Byte X contains info about Services num (8X-7) to num (8X) |
| 442 | # bit = 1: service available |
| 443 | # bit = 0: service not available |
| 444 | avail_st += '\tService %d - %s\n' % ((8*i) + j, lookup_map[(8*i) + j]) |
| 445 | byte = byte >> 1 |
| 446 | return avail_st |
Supreeth Herle | 9837055 | 2020-05-11 09:04:41 +0200 | [diff] [blame] | 447 | |
| 448 | def first_TLV_parser(bytelist): |
| 449 | ''' |
| 450 | first_TLV_parser([0xAA, 0x02, 0xAB, 0xCD, 0xFF, 0x00]) -> (170, 2, [171, 205]) |
| 451 | |
| 452 | parses first TLV format record in a list of bytelist |
| 453 | returns a 3-Tuple: Tag, Length, Value |
| 454 | Value is a list of bytes |
| 455 | parsing of length is ETSI'style 101.220 |
| 456 | ''' |
| 457 | Tag = bytelist[0] |
| 458 | if bytelist[1] == 0xFF: |
| 459 | Len = bytelist[2]*256 + bytelist[3] |
| 460 | Val = bytelist[4:4+Len] |
| 461 | else: |
| 462 | Len = bytelist[1] |
| 463 | Val = bytelist[2:2+Len] |
| 464 | return (Tag, Len, Val) |
| 465 | |
| 466 | def TLV_parser(bytelist): |
| 467 | ''' |
| 468 | TLV_parser([0xAA, ..., 0xFF]) -> [(T, L, [V]), (T, L, [V]), ...] |
| 469 | |
| 470 | loops on the input list of bytes with the "first_TLV_parser()" function |
| 471 | returns a list of 3-Tuples |
| 472 | ''' |
| 473 | ret = [] |
| 474 | while len(bytelist) > 0: |
| 475 | T, L, V = first_TLV_parser(bytelist) |
| 476 | if T == 0xFF: |
| 477 | # padding bytes |
| 478 | break |
| 479 | ret.append( (T, L, V) ) |
| 480 | # need to manage length of L |
| 481 | if L > 0xFE: |
| 482 | bytelist = bytelist[ L+4 : ] |
| 483 | else: |
| 484 | bytelist = bytelist[ L+2 : ] |
| 485 | return ret |
Supreeth Herle | d572ede | 2020-03-22 09:55:04 +0100 | [diff] [blame] | 486 | |
Supreeth Herle | d84daa1 | 2020-03-24 12:20:40 +0100 | [diff] [blame] | 487 | def enc_st(st, service, state=1): |
| 488 | """ |
| 489 | Encodes the EF S/U/IST/EST and returns the updated Service Table |
| 490 | |
| 491 | Parameters: |
| 492 | st - Current value of SIM/USIM/ISIM Service Table |
| 493 | service - Service Number to encode as activated/de-activated |
| 494 | state - 1 mean activate, 0 means de-activate |
| 495 | |
| 496 | Returns: |
| 497 | s - Modified value of SIM/USIM/ISIM Service Table |
| 498 | |
| 499 | Default values: |
| 500 | - state: 1 - Sets the particular Service bit to 1 |
| 501 | """ |
| 502 | st_bytes = [st[i:i+2] for i in range(0, len(st), 2) ] |
| 503 | |
| 504 | s = "" |
| 505 | # Check whether the requested service is present in each byte |
| 506 | for i in range(0, len(st_bytes)): |
| 507 | # Byte i contains info about Services num (8i+1) to num (8i+8) |
| 508 | if service in range((8*i) + 1, (8*i) + 9): |
| 509 | byte = int(st_bytes[i], 16) |
| 510 | # Services in each byte are in order MSB to LSB |
| 511 | # MSB - Service (8i+8) |
| 512 | # LSB - Service (8i+1) |
| 513 | mod_byte = 0x00 |
| 514 | # Copy bit by bit contents of byte to mod_byte with modified bit |
| 515 | # for requested service |
| 516 | for j in range(1, 9): |
| 517 | mod_byte = mod_byte >> 1 |
| 518 | if service == (8*i) + j: |
| 519 | mod_byte = state == 1 and mod_byte|0x80 or mod_byte&0x7f |
| 520 | else: |
| 521 | mod_byte = byte&0x01 == 0x01 and mod_byte|0x80 or mod_byte&0x7f |
| 522 | byte = byte >> 1 |
| 523 | |
| 524 | s += ('%02x' % (mod_byte)) |
| 525 | else: |
| 526 | s += st_bytes[i] |
| 527 | |
| 528 | return s |
| 529 | |
Supreeth Herle | 3b342c2 | 2020-03-24 16:15:02 +0100 | [diff] [blame] | 530 | def dec_addr_tlv(hexstr): |
Supreeth Herle | d572ede | 2020-03-22 09:55:04 +0100 | [diff] [blame] | 531 | """ |
Supreeth Herle | 3b342c2 | 2020-03-24 16:15:02 +0100 | [diff] [blame] | 532 | Decode hex string to get EF.P-CSCF Address or EF.ePDGId or EF.ePDGIdEm. |
| 533 | See 3GPP TS 31.102 version 13.4.0 Release 13, section 4.2.8, 4.2.102 and 4.2.104. |
Supreeth Herle | d572ede | 2020-03-22 09:55:04 +0100 | [diff] [blame] | 534 | """ |
| 535 | |
| 536 | # Convert from hex str to int bytes list |
Supreeth Herle | 3b342c2 | 2020-03-24 16:15:02 +0100 | [diff] [blame] | 537 | addr_tlv_bytes = h2i(hexstr) |
Supreeth Herle | d572ede | 2020-03-22 09:55:04 +0100 | [diff] [blame] | 538 | |
| 539 | s = "" |
| 540 | |
| 541 | # Get list of tuples containing parsed TLVs |
Supreeth Herle | 3b342c2 | 2020-03-24 16:15:02 +0100 | [diff] [blame] | 542 | tlvs = TLV_parser(addr_tlv_bytes) |
Supreeth Herle | d572ede | 2020-03-22 09:55:04 +0100 | [diff] [blame] | 543 | |
| 544 | for tlv in tlvs: |
| 545 | # tlv = (T, L, [V]) |
| 546 | # T = Tag |
| 547 | # L = Length |
| 548 | # [V] = List of value |
| 549 | |
| 550 | # Invalid Tag value scenario |
| 551 | if tlv[0] != 0x80: |
| 552 | continue |
| 553 | |
Supreeth Herle | d6a5ec5 | 2020-06-01 12:27:51 +0200 | [diff] [blame] | 554 | # Empty field - Zero length |
| 555 | if tlv[1] == 0: |
| 556 | continue |
| 557 | |
Supreeth Herle | d572ede | 2020-03-22 09:55:04 +0100 | [diff] [blame] | 558 | # First byte in the value has the address type |
| 559 | addr_type = tlv[2][0] |
Supreeth Herle | 43fd03b | 2020-03-25 14:52:46 +0100 | [diff] [blame] | 560 | # TODO: Support parsing of IPv6 |
Supreeth Herle | 3b342c2 | 2020-03-24 16:15:02 +0100 | [diff] [blame] | 561 | # Address Type: 0x00 (FQDN), 0x01 (IPv4), 0x02 (IPv6), other (Reserved) |
Supreeth Herle | d572ede | 2020-03-22 09:55:04 +0100 | [diff] [blame] | 562 | if addr_type == 0x00: #FQDN |
| 563 | # Skip address tye byte i.e. first byte in value list |
| 564 | content = tlv[2][1:] |
| 565 | s += "\t%s # %s\n" % (i2h(content), i2s(content)) |
Supreeth Herle | 43fd03b | 2020-03-25 14:52:46 +0100 | [diff] [blame] | 566 | elif addr_type == 0x01: #IPv4 |
| 567 | # Skip address tye byte i.e. first byte in value list |
| 568 | # Skip the unused byte in Octect 4 after address type byte as per 3GPP TS 31.102 |
| 569 | ipv4 = tlv[2][2:] |
| 570 | content = '.'.join(str(x) for x in ipv4) |
| 571 | s += "\t%s # %s\n" % (i2h(ipv4), content) |
Supreeth Herle | d572ede | 2020-03-22 09:55:04 +0100 | [diff] [blame] | 572 | |
| 573 | return s |
Philipp Maier | ff84c23 | 2020-05-12 17:24:18 +0200 | [diff] [blame] | 574 | |
Supreeth Herle | 3b342c2 | 2020-03-24 16:15:02 +0100 | [diff] [blame] | 575 | def enc_addr_tlv(addr, addr_type='00'): |
Supreeth Herle | 3c0bd7a | 2020-03-23 11:59:33 +0100 | [diff] [blame] | 576 | """ |
Supreeth Herle | 3b342c2 | 2020-03-24 16:15:02 +0100 | [diff] [blame] | 577 | Encode address TLV object used in EF.P-CSCF Address, EF.ePDGId and EF.ePDGIdEm. |
| 578 | See 3GPP TS 31.102 version 13.4.0 Release 13, section 4.2.8, 4.2.102 and 4.2.104. |
Supreeth Herle | 3c0bd7a | 2020-03-23 11:59:33 +0100 | [diff] [blame] | 579 | |
| 580 | Default values: |
Supreeth Herle | 3b342c2 | 2020-03-24 16:15:02 +0100 | [diff] [blame] | 581 | - addr_type: 00 - FQDN format of Address |
Supreeth Herle | 3c0bd7a | 2020-03-23 11:59:33 +0100 | [diff] [blame] | 582 | """ |
| 583 | |
| 584 | s = "" |
| 585 | |
Supreeth Herle | 654eca7 | 2020-03-25 14:25:38 +0100 | [diff] [blame] | 586 | # TODO: Encoding of IPv6 address |
| 587 | if addr_type == '00': #FQDN |
Supreeth Herle | 3b342c2 | 2020-03-24 16:15:02 +0100 | [diff] [blame] | 588 | hex_str = s2h(addr) |
Supreeth Herle | 3c0bd7a | 2020-03-23 11:59:33 +0100 | [diff] [blame] | 589 | s += '80' + ('%02x' % ((len(hex_str)//2)+1)) + '00' + hex_str |
Supreeth Herle | 654eca7 | 2020-03-25 14:25:38 +0100 | [diff] [blame] | 590 | elif addr_type == '01': #IPv4 |
| 591 | ipv4_list = addr.split('.') |
| 592 | ipv4_str = "" |
| 593 | for i in ipv4_list: |
| 594 | ipv4_str += ('%02x' % (int(i))) |
| 595 | |
| 596 | # Unused bytes shall be set to 'ff'. i.e 4th Octet after Address Type is not used |
| 597 | # IPv4 Address is in octet 5 to octet 8 of the TLV data object |
| 598 | s += '80' + ('%02x' % ((len(ipv4_str)//2)+2)) + '01' + 'ff' + ipv4_str |
Supreeth Herle | 3c0bd7a | 2020-03-23 11:59:33 +0100 | [diff] [blame] | 599 | |
| 600 | return s |
| 601 | |
Philipp Maier | 4723650 | 2021-03-09 21:28:25 +0100 | [diff] [blame] | 602 | def is_hex(string, minlen=2, maxlen=None) -> bool: |
| 603 | """ |
| 604 | Check if a string is a valid hexstring |
| 605 | """ |
| 606 | |
| 607 | # Filter obviously bad strings |
| 608 | if not string: |
| 609 | return False |
| 610 | if len(string) < minlen or minlen < 2: |
| 611 | return False |
| 612 | if len(string) % 2: |
| 613 | return False |
| 614 | if maxlen and len(string) > maxlen: |
| 615 | return False |
| 616 | |
| 617 | # Try actual encoding to be sure |
| 618 | try: |
| 619 | try_encode = h2b(string) |
| 620 | return True |
| 621 | except: |
| 622 | return False |
| 623 | |
Harald Welte | 79b5ba4 | 2021-01-08 21:22:38 +0100 | [diff] [blame] | 624 | def sanitize_pin_adm(pin_adm, pin_adm_hex = None): |
Philipp Maier | e8536c0 | 2020-05-11 21:35:01 +0200 | [diff] [blame] | 625 | """ |
| 626 | The ADM pin can be supplied either in its hexadecimal form or as |
| 627 | ascii string. This function checks the supplied opts parameter and |
Harald Welte | 236a65f | 2021-04-03 10:20:11 +0200 | [diff] [blame] | 628 | returns the pin_adm as hex encoded string, regardless in which form |
Philipp Maier | e8536c0 | 2020-05-11 21:35:01 +0200 | [diff] [blame] | 629 | it was originally supplied by the user |
| 630 | """ |
| 631 | |
Harald Welte | 79b5ba4 | 2021-01-08 21:22:38 +0100 | [diff] [blame] | 632 | if pin_adm is not None: |
| 633 | if len(pin_adm) <= 8: |
| 634 | pin_adm = ''.join(['%02x'%(ord(x)) for x in pin_adm]) |
Philipp Maier | e8536c0 | 2020-05-11 21:35:01 +0200 | [diff] [blame] | 635 | pin_adm = rpad(pin_adm, 16) |
| 636 | |
| 637 | else: |
| 638 | raise ValueError("PIN-ADM needs to be <=8 digits (ascii)") |
| 639 | |
Harald Welte | 79b5ba4 | 2021-01-08 21:22:38 +0100 | [diff] [blame] | 640 | if pin_adm_hex is not None: |
| 641 | if len(pin_adm_hex) == 16: |
| 642 | pin_adm = pin_adm_hex |
Philipp Maier | e8536c0 | 2020-05-11 21:35:01 +0200 | [diff] [blame] | 643 | # Ensure that it's hex-encoded |
| 644 | try: |
| 645 | try_encode = h2b(pin_adm) |
| 646 | except ValueError: |
| 647 | raise ValueError("PIN-ADM needs to be hex encoded using this option") |
| 648 | else: |
| 649 | raise ValueError("PIN-ADM needs to be exactly 16 digits (hex encoded)") |
| 650 | |
| 651 | return pin_adm |
| 652 | |
Philipp Maier | ff84c23 | 2020-05-12 17:24:18 +0200 | [diff] [blame] | 653 | def init_reader(opts): |
| 654 | """ |
| 655 | Init card reader driver |
| 656 | """ |
Philipp Maier | c8caec2 | 2021-02-22 16:07:53 +0100 | [diff] [blame] | 657 | try: |
| 658 | if opts.pcsc_dev is not None: |
| 659 | print("Using PC/SC reader interface") |
| 660 | from pySim.transport.pcsc import PcscSimLink |
| 661 | sl = PcscSimLink(opts.pcsc_dev) |
| 662 | elif opts.osmocon_sock is not None: |
| 663 | print("Using Calypso-based (OsmocomBB) reader interface") |
| 664 | from pySim.transport.calypso import CalypsoSimLink |
| 665 | sl = CalypsoSimLink(sock_path=opts.osmocon_sock) |
| 666 | elif opts.modem_dev is not None: |
| 667 | print("Using modem for Generic SIM Access (3GPP TS 27.007)") |
| 668 | from pySim.transport.modem_atcmd import ModemATCommandLink |
| 669 | sl = ModemATCommandLink(device=opts.modem_dev, baudrate=opts.modem_baud) |
| 670 | else: # Serial reader is default |
| 671 | print("Using serial reader interface") |
| 672 | from pySim.transport.serial import SerialSimLink |
| 673 | sl = SerialSimLink(device=opts.device, baudrate=opts.baudrate) |
| 674 | return sl |
| 675 | except Exception as e: |
| 676 | print("Card reader initialization failed with exception:\n" + str(e)) |
| 677 | return None |
Philipp Maier | ff84c23 | 2020-05-12 17:24:18 +0200 | [diff] [blame] | 678 | |
Supreeth Herle | 95b4e8d | 2020-03-24 12:49:16 +0100 | [diff] [blame] | 679 | |
Supreeth Herle | 95ec772 | 2020-03-24 13:09:03 +0100 | [diff] [blame] | 680 | def enc_ePDGSelection(hexstr, mcc, mnc, epdg_priority='0001', epdg_fqdn_format='00'): |
| 681 | """ |
| 682 | Encode ePDGSelection so it can be stored at EF.ePDGSelection or EF.ePDGSelectionEm. |
| 683 | See 3GPP TS 31.102 version 15.2.0 Release 15, section 4.2.104 and 4.2.106. |
| 684 | |
| 685 | Default values: |
| 686 | - epdg_priority: '0001' - 1st Priority |
| 687 | - epdg_fqdn_format: '00' - Operator Identifier FQDN |
| 688 | """ |
| 689 | |
| 690 | plmn1 = enc_plmn(mcc, mnc) + epdg_priority + epdg_fqdn_format |
| 691 | # TODO: Handle encoding of Length field for length more than 127 Bytes |
| 692 | content = '80' + ('%02x' % (len(plmn1)//2)) + plmn1 |
| 693 | content = rpad(content, len(hexstr)) |
| 694 | return content |
| 695 | |
Supreeth Herle | 95b4e8d | 2020-03-24 12:49:16 +0100 | [diff] [blame] | 696 | def dec_ePDGSelection(sixhexbytes): |
| 697 | """ |
| 698 | Decode ePDGSelection to get EF.ePDGSelection or EF.ePDGSelectionEm. |
| 699 | See 3GPP TS 31.102 version 15.2.0 Release 15, section 4.2.104 and 4.2.106. |
| 700 | """ |
| 701 | |
| 702 | res = {'mcc': 0, 'mnc': 0, 'epdg_priority': 0, 'epdg_fqdn_format': ''} |
| 703 | plmn_chars = 6 |
| 704 | epdg_priority_chars = 4 |
| 705 | epdg_fqdn_format_chars = 2 |
| 706 | # first three bytes (six ascii hex chars) |
| 707 | plmn_str = sixhexbytes[:plmn_chars] |
| 708 | # two bytes after first three bytes |
| 709 | epdg_priority_str = sixhexbytes[plmn_chars:plmn_chars + epdg_priority_chars] |
| 710 | # one byte after first five bytes |
| 711 | epdg_fqdn_format_str = sixhexbytes[plmn_chars + epdg_priority_chars:plmn_chars + epdg_priority_chars + epdg_fqdn_format_chars] |
| 712 | res['mcc'] = dec_mcc_from_plmn(plmn_str) |
| 713 | res['mnc'] = dec_mnc_from_plmn(plmn_str) |
| 714 | res['epdg_priority'] = epdg_priority_str |
| 715 | res['epdg_fqdn_format'] = epdg_fqdn_format_str == '00' and 'Operator Identifier FQDN' or 'Location based FQDN' |
| 716 | return res |
| 717 | |
| 718 | def format_ePDGSelection(hexstr): |
| 719 | ePDGSelection_info_tag_chars = 2 |
| 720 | ePDGSelection_info_tag_str = hexstr[:2] |
herlesupreeth | 3a261d3 | 2021-01-05 09:20:11 +0100 | [diff] [blame] | 721 | s = "" |
Supreeth Herle | 95b4e8d | 2020-03-24 12:49:16 +0100 | [diff] [blame] | 722 | # Minimum length |
| 723 | len_chars = 2 |
| 724 | # TODO: Need to determine length properly - definite length support only |
| 725 | # Inconsistency in spec: 3GPP TS 31.102 version 15.2.0 Release 15, 4.2.104 |
| 726 | # As per spec, length is 5n, n - number of PLMNs |
| 727 | # But, each PLMN entry is made of PLMN (3 Bytes) + ePDG Priority (2 Bytes) + ePDG FQDN format (1 Byte) |
| 728 | # Totalling to 6 Bytes, maybe length should be 6n |
| 729 | len_str = hexstr[ePDGSelection_info_tag_chars:ePDGSelection_info_tag_chars+len_chars] |
herlesupreeth | 3a261d3 | 2021-01-05 09:20:11 +0100 | [diff] [blame] | 730 | |
| 731 | # Not programmed scenario |
| 732 | if int(len_str, 16) == 255 or int(ePDGSelection_info_tag_str, 16) == 255: |
| 733 | len_chars = 0 |
| 734 | ePDGSelection_info_tag_chars = 0 |
Supreeth Herle | 95b4e8d | 2020-03-24 12:49:16 +0100 | [diff] [blame] | 735 | if len_str[0] == '8': |
| 736 | # The bits 7 to 1 denotes the number of length octets if length > 127 |
| 737 | if int(len_str[1]) > 0: |
| 738 | # Update number of length octets |
| 739 | len_chars = len_chars * int(len_str[1]) |
| 740 | len_str = hexstr[ePDGSelection_info_tag_chars:len_chars] |
| 741 | |
| 742 | content_str = hexstr[ePDGSelection_info_tag_chars+len_chars:] |
| 743 | # Right pad to prevent index out of range - multiple of 6 bytes |
| 744 | content_str = rpad(content_str, len(content_str) + (12 - (len(content_str) % 12))) |
Supreeth Herle | 95b4e8d | 2020-03-24 12:49:16 +0100 | [diff] [blame] | 745 | for rec_data in hexstr_to_Nbytearr(content_str, 6): |
| 746 | rec_info = dec_ePDGSelection(rec_data) |
| 747 | if rec_info['mcc'] == 0xFFF and rec_info['mnc'] == 0xFFF: |
| 748 | rec_str = "unused" |
| 749 | else: |
| 750 | rec_str = "MCC: %03d MNC: %03d ePDG Priority: %s ePDG FQDN format: %s" % \ |
| 751 | (rec_info['mcc'], rec_info['mnc'], rec_info['epdg_priority'], rec_info['epdg_fqdn_format']) |
| 752 | s += "\t%s # %s\n" % (rec_data, rec_str) |
| 753 | return s |
Supreeth Herle | 556b0fe | 2020-03-25 11:26:57 +0100 | [diff] [blame] | 754 | |
| 755 | def get_addr_type(addr): |
| 756 | """ |
| 757 | Validates the given address and returns it's type (FQDN or IPv4 or IPv6) |
| 758 | Return: 0x00 (FQDN), 0x01 (IPv4), 0x02 (IPv6), None (Bad address argument given) |
| 759 | |
| 760 | TODO: Handle IPv6 |
| 761 | """ |
| 762 | |
| 763 | # Empty address string |
| 764 | if not len(addr): |
| 765 | return None |
| 766 | |
Supreeth Herle | 556b0fe | 2020-03-25 11:26:57 +0100 | [diff] [blame] | 767 | addr_list = addr.split('.') |
| 768 | |
| 769 | # Check for IPv4/IPv6 |
| 770 | try: |
| 771 | import ipaddress |
| 772 | # Throws ValueError if addr is not correct |
Denis 'GNUtoo' Carikli | 79f5b60 | 2020-02-15 04:02:57 +0700 | [diff] [blame] | 773 | ipa = ipaddress.ip_address(addr) |
Supreeth Herle | 556b0fe | 2020-03-25 11:26:57 +0100 | [diff] [blame] | 774 | |
| 775 | if ipa.version == 4: |
| 776 | return 0x01 |
| 777 | elif ipa.version == 6: |
| 778 | return 0x02 |
| 779 | except Exception as e: |
| 780 | invalid_ipv4 = True |
| 781 | for i in addr_list: |
| 782 | # Invalid IPv4 may qualify for a valid FQDN, so make check here |
| 783 | # e.g. 172.24.15.300 |
| 784 | import re |
| 785 | if not re.match('^[0-9_]+$', i): |
| 786 | invalid_ipv4 = False |
| 787 | break |
| 788 | |
| 789 | if invalid_ipv4: |
| 790 | return None |
| 791 | |
| 792 | fqdn_flag = True |
| 793 | for i in addr_list: |
| 794 | # Only Alpha-numeric characters and hyphen - RFC 1035 |
| 795 | import re |
| 796 | if not re.match("^[a-zA-Z0-9]+(?:-[a-zA-Z0-9]+)?$", i): |
| 797 | fqdn_flag = False |
| 798 | break |
| 799 | |
| 800 | # FQDN |
| 801 | if fqdn_flag: |
| 802 | return 0x00 |
| 803 | |
| 804 | return None |
Harald Welte | 67d551a | 2021-01-21 14:50:01 +0100 | [diff] [blame] | 805 | |
Harald Welte | 1e45657 | 2021-04-02 17:16:30 +0200 | [diff] [blame] | 806 | def sw_match(sw:str, pattern:str) -> bool: |
Harald Welte | 67d551a | 2021-01-21 14:50:01 +0100 | [diff] [blame] | 807 | """Match given SW against given pattern.""" |
| 808 | # Create a masked version of the returned status word |
| 809 | sw_lower = sw.lower() |
| 810 | sw_masked = "" |
| 811 | for i in range(0, 4): |
Philipp Maier | 78e32f2 | 2021-03-22 20:39:24 +0100 | [diff] [blame] | 812 | if pattern[i] == '?': |
Harald Welte | 67d551a | 2021-01-21 14:50:01 +0100 | [diff] [blame] | 813 | sw_masked = sw_masked + '?' |
Philipp Maier | 78e32f2 | 2021-03-22 20:39:24 +0100 | [diff] [blame] | 814 | elif pattern[i] == 'x': |
Harald Welte | 67d551a | 2021-01-21 14:50:01 +0100 | [diff] [blame] | 815 | sw_masked = sw_masked + 'x' |
| 816 | else: |
| 817 | sw_masked = sw_masked + sw_lower[i] |
Philipp Maier | 78e32f2 | 2021-03-22 20:39:24 +0100 | [diff] [blame] | 818 | # Compare the masked version against the pattern |
Harald Welte | 67d551a | 2021-01-21 14:50:01 +0100 | [diff] [blame] | 819 | return sw_masked == pattern |
Philipp Maier | 5d3e259 | 2021-02-22 17:22:16 +0100 | [diff] [blame] | 820 | |
Harald Welte | ee3501f | 2021-04-02 13:00:18 +0200 | [diff] [blame] | 821 | def tabulate_str_list(str_list, width:int = 79, hspace:int = 2, lspace:int = 1, |
| 822 | align_left:bool = True): |
| 823 | """Pretty print a list of strings into a tabulated form. |
| 824 | |
| 825 | Args: |
| 826 | width : total width in characters per line |
| 827 | space : horizontal space between cells |
| 828 | lspace : number of spaces before row |
| 829 | align_lef : Align text to the left side |
| 830 | Returns: |
| 831 | multi-line string containing formatted table |
| 832 | """ |
Philipp Maier | 5d3e259 | 2021-02-22 17:22:16 +0100 | [diff] [blame] | 833 | if str_list == None: |
| 834 | return "" |
| 835 | if len(str_list) <= 0: |
| 836 | return "" |
| 837 | longest_str = max(str_list, key=len) |
| 838 | cellwith = len(longest_str) + hspace |
| 839 | cols = width // cellwith |
| 840 | rows = (len(str_list) - 1) // cols + 1 |
| 841 | table = [] |
| 842 | for i in iter(range(rows)): |
| 843 | str_list_row = str_list[i::rows] |
| 844 | if (align_left): |
| 845 | format_str_cell = '%%-%ds' |
| 846 | else: |
| 847 | format_str_cell = '%%%ds' |
| 848 | format_str_row = (format_str_cell % cellwith) * len(str_list_row) |
| 849 | format_str_row = (" " * lspace) + format_str_row |
| 850 | table.append(format_str_row % tuple(str_list_row)) |
| 851 | return '\n'.join(table) |