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annotate doc/GrcardSIM2-programming @ 18:da6e9d0b2ee6

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author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Mar 2021 07:57:09 +0000
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children 42229bec887b
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1 The card model which we call GrcardSIM2 is one of the many smart card models
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2 made and sold by Grcard in China. As of this writing (2021-03) and going back
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3 to somewhere around 2013, it is the card model they sell when a customer asks
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4 for a GSM-only SIM card, as opposed to USIM cards for UMTS/LTE/etc. This card
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5 model was once resold by Sysmocom as sysmoSIM-GR2, and we are hoping to get a
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6 batch of our own FreeCalypso-branded version which we call FCSIM1.
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7
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8 Our fc-simtool supports full programming of these cards: you can take a card
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9 whose initial state is "blank" or unprogrammed, or a card with some previous
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10 programming, and you can program it to your own liking using fc-simtool. For
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11 the purpose of programming this particular card model (as opposed to USIM/ISIM
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12 cards), our fc-simtool offers the following advantages over well-known
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13 competitor pySim-prog:
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14
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15 * These cards support all 3 versions of COMP128 algorithm (v1, v2 and v3), but
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16 pySim-prog unconditionally selects COMP128v1. Our grcard2-set-comp128 command
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17 allows any of the 3 algorithm versions to be selected, and in the Mother's
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18 opinion it makes no sense to select any version other than COMP128v3 for new
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19 GSM network deployments.
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20
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21 * These cards have a fairly sophisticated security model with two different ADM
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22 access levels: see GrcardSIM2-security-model article for the details.
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23 pySim-prog support for this security model is fundamentally broken: it
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24 authenticates with ADM11 as required for writing Ki, but does not support any
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25 option of changing this key to a secure one, as would be required in any
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26 application where traditional SIM security is desired. OTOH, pySim-prog
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27 needlessly resets ADM5, even though they could have left it alone - ADM11 by
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28 itself is sufficient for writing to all files.
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29
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30 * Further on the security model, GrcardSIM2 cards allow admins to reset
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31 PIN1/PIN2/PUK1/PUK2 secret codes after authenticating with ADM5 or ADM11 -
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32 this mechanism is the only way to reset PUK1 and PUK2 if the previous codes
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33 are unknown. pySim-prog provides no support for setting PIN/PUK codes.
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34
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35 * fc-simtool allows every single file in the card file system to be written as
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36 you like. Absolutely any file can be read and written in raw hex, and we also
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37 provide high-level read and write commands for most files. In contrast,
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38 pySim-prog implements a rigid and inflexible programming model, writing only
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39 a few files and only in one very limited way.
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40
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41 Using fc-simtool to program GrcardSIM2 cards
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42 ============================================
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43
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44 To begin with, you must know the ADM11 (aka SUPER ADM) secret code for your
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45 card. If you got your card directly from Grcard factory or from a reseller such
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46 as FreeCalypso who leaves this default ADM11 key unchanged, your ADM11 key is
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47 ASCII-decimal 88888888, and you need to authenticate as follows:
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48
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49 verify-ext 11 88888888
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50
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51 If the previous owner of your card changed this ADM11 key to something else, or
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52 if you had Grcard factory program cards for you with different ADM keys, then
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53 you need to know what the ADM11 secret is - if it is lost, there is no recovery,
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54 and you have to get a new card. If you have a non-default ADM11 key, you need
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55 to enter it using either verify-ext 11 or verify-hex 11 command, depending on
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56 whether the key falls into the restricted ASCII-decimal subset or not. In any
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57 case, this verify-ext 11 or verify-hex 11 command should ideally be the first
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58 command in your fc-simtool session; if it is not the first command in the
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59 session, then it needs to be preceded with select MF.
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60
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61 Once you have authenticated with ADM11, you are ready to run your programming
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62 scripts. Because fc-simtool is not a "one size fits all" tool like pySim-prog,
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63 but rather a fully generalized command shell that allows you to poke at whatever
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64 files you like in whatever order and manner you like, practical SIM programming
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65 should be done with customized command scripts. Furthermore, we recommend that
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66 you split your custom programming scripts into two levels:
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67
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68 1) You should have one command script which you install under
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69 /opt/freecalypso/sim-scripts that programs SIMs appropriately for your GSM
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70 network. This script should be the same for all of your cards, programming
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71 SST, PLMN selection (PLMNsel and FPLMN) and branding files SPN, PNN and OPL.
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72 See our fcsim1-defprog script for a starting point.
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73
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74 2) Per-card settings like ICCID, IMSI, ACC and Ki can only be set either
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75 manually (OK for one or two cards, but doesn't scale), or by way of custom
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76 front end or wrapper programs that generate and execute one-time fc-simtool
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77 command scripts. We plan on implementing one such front end tool once we
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78 get our FCSIM1 card batch made.
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79
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80 Please refer to Admin-write-commands, GrcardSIM2-WEKI-file and
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81 GrcardSIM2-security-model articles for commands to be used in crafting your
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82 custom programming scripts.