docs/shell.rst

pySim-shell
===========

pySim-shell is an interactive command line shell for all kind of interactions with SIM cards.

The interactive shell provides command for

* navigating the on-card filesystem hierarchy
* authenticating with PINs such as ADM1
* CHV/PIN management (VERIFY, ENABLE, DISABLE, UNBLOCK)
* decoding of SELECT response (file control parameters)
* reading and writing of files and records in raw, hex-encoded binary format
* for some files where related support has been developed:

 * decoded reading (display file data in JSON format)
 * decoded writing (encode from JSON to binary format, then write)

By means of using the python ``cmd2`` module, various useful features improve usability:

* history of commands (persistent across restarts)
* output re-direction to files on your computer
* output piping through external tools like 'grep'
* tab completion of commands and SELECT-able files/directories
* interactive help for all commands

Running pySim-shell
-------------------

pySim-shell has a variety of command line arguments to control

* which transport to use (how to use a reader to talk to the SIM card)
* whether to automatically verify an ADM pin (and in which format)
* whether to execute a start-up script

.. argparse::
   :module: pySim-shell
   :func: option_parser



cmd2 basics
-----------

FIXME



ISO7816 commands
----------------

This category of commands relates to commands that originate in the ISO 7861-4 specifications,
most of them have a 1:1 resemblance in the specification.

select
~~~~~~

The ``select`` command is used to select a file, either by its FID, AID or by its symbolic name.

Try ``select`` with tab-completion to get a list of all current selectable items:

::

  pySIM-shell (MF)> select
  ..                2fe2              a0000000871004    EF.ARR            MF
  2f00              3f00              ADF.ISIM          EF.DIR
  2f05              7f10              ADF.USIM          EF.ICCID
  2f06              7f20              DF.GSM            EF.PL
  2f08              a0000000871002    DF.TELECOM        EF.UMPC

Use ``select`` with a specific FID or name to select the new file.

This will

* output the [JSON decoded, if possible] select response
* change the prompt to the newly selected file
* enable any commands specific to the newly-selected file

::

  pySIM-shell (MF)> select ADF.USIM
  {
      "file_descriptor": {
          "shareable": true,
          "file_type": "df",
          "structure": "no_info_given"
      },
      "df_name": "A0000000871002FFFFFFFF8907090000",
      "proprietary_info": {
          "uicc_characteristics": "71",
          "available_memory": 101640
      },
      "life_cycle_status_int": "operational_activated",
      "security_attrib_compact": "00",
      "pin_status_template_do": "90017083010183018183010A83010B"
  }
  pySIM-shell (MF/ADF.USIM)>



change_chv
~~~~~~~~~~
.. argparse::
   :module: pySim-shell
   :func: Iso7816Commands.change_chv_parser


disable_chv
~~~~~~~~~~~
.. argparse::
   :module: pySim-shell
   :func: Iso7816Commands.disable_chv_parser


enable_chv
~~~~~~~~~~
.. argparse::
   :module: pySim-shell
   :func: Iso7816Commands.enable_chv_parser


unblock_chv
~~~~~~~~~~~
.. argparse::
   :module: pySim-shell
   :func: Iso7816Commands.unblock_chv_parser


verify_chv
~~~~~~~~~~
This command allows you to verify a CHV (PIN), which is how the specifications call
it if you authenticate yourself with the said CHV/PIN.

.. argparse::
   :module: pySim-shell
   :func: Iso7816Commands.verify_chv_parser

deactivate_file
~~~~~~~~~~~~~~~
Deactivate the currently selected file.  This used to be called INVALIDATE in TS 11.11.


activate_file
~~~~~~~~~~~~~
Activate the currently selected file.  This used to be called REHABILITATE in TS 11.11.

open_channel
~~~~~~~~~~~~
.. argparse::
   :module: pySim-shell
   :func: Iso7816Commands.open_chan_parser

close_channel
~~~~~~~~~~~~~
.. argparse::
   :module: pySim-shell
   :func: Iso7816Commands.close_chan_parser


suspend_uicc
~~~~~~~~~~~~
This command allows you to perform the SUSPEND UICC command on the card.  This is a relatively
recent power-saving addition to the UICC specifications, allowing for suspend/resume while maintaining
state, as opposed to a full power-off (deactivate) and power-on (activate) of the card.

The pySim command just sends that SUSPEND UICC command and doesn't perform the full related sequence
including the electrical power down.

.. argparse::
   :module: pySim-shell
   :func: Iso7816Commands.suspend_uicc_parser


pySim commands
--------------

Commands in this category are pySim specific; they do not have a 1:1 correspondence to ISO 7816
or 3GPP commands. Mostly they will operate either only on local (in-memory) state, or execute
a complex sequence of card-commands.

desc
~~~~

Display human readable file description for the currently selected file.


dir
~~~
.. argparse::
   :module: pySim-shell
   :func: PySimCommands.dir_parser


export
~~~~~~
.. argparse::
   :module: pySim-shell
   :func: PySimCommands.export_parser


tree
~~~~

Display a tree of the card filesystem.  It is important to note that this displays a tree
of files that might potentially exist (based on the card profile).  In order to determine if
a given file really exists on a given card, you have to try to select that file.


verify_adm
~~~~~~~~~~

Verify the ADM (Administrator) PIN specified as argument.  This is typically needed in order
to get write/update permissions to most of the files on SIM cards.

Currently only ADM1 is supported.


reset
~~~~~

Perform card reset and display the card ATR.


Linear Fixed EF commands
------------------------

These commands become enabled only when your currently selected file is of *Linear Fixed EF* type.

read_record
~~~~~~~~~~~
.. argparse::
   :module: pySim.filesystem
   :func: LinFixedEF.ShellCommands.read_rec_parser


read_record_decoded
~~~~~~~~~~~~~~~~~~~
.. argparse::
   :module: pySim.filesystem
   :func: LinFixedEF.ShellCommands.read_rec_dec_parser


read_records
~~~~~~~~~~~~
.. argparse::
   :module: pySim.filesystem
   :func: LinFixedEF.ShellCommands.read_recs_parser


read_records_decoded
~~~~~~~~~~~~~~~~~~~~
.. argparse::
   :module: pySim.filesystem
   :func: LinFixedEF.ShellCommands.read_recs_dec_parser


update_record
~~~~~~~~~~~~~
.. argparse::
   :module: pySim.filesystem
   :func: LinFixedEF.ShellCommands.upd_rec_parser


update_record_decoded
~~~~~~~~~~~~~~~~~~~~~
.. argparse::
   :module: pySim.filesystem
   :func: LinFixedEF.ShellCommands.upd_rec_dec_parser


edit_record_decoded
~~~~~~~~~~~~~~~~~~~
.. argparse::
   :module: pySim.filesystem
   :func: LinFixedEF.ShellCommands.edit_rec_dec_parser

This command will read the selected record, decode it to its JSON representation, save
that JSON to a temporary file on your computer, and launch your configured text editor.

You may then perform whatever modifications to the JSON representation, save + leave your
text editor.

Afterwards, the modified JSON will be re-encoded to the binary format, and the result written
back to the record on the SIM card.

This allows for easy interactive modification of records.



Transparent EF commands
-----------------------

These commands become enabled only when your currently selected file is of *Transparent EF* type.


read_binary
~~~~~~~~~~~
.. argparse::
   :module: pySim.filesystem
   :func: TransparentEF.ShellCommands.read_bin_parser


read_binary_decoded
~~~~~~~~~~~~~~~~~~~
.. argparse::
   :module: pySim.filesystem
   :func: TransparentEF.ShellCommands.read_bin_dec_parser


update_binary
~~~~~~~~~~~~~
.. argparse::
   :module: pySim.filesystem
   :func: TransparentEF.ShellCommands.upd_bin_parser


update_binary_decoded
~~~~~~~~~~~~~~~~~~~~~
.. argparse::
   :module: pySim.filesystem
   :func: TransparentEF.ShellCommands.upd_bin_dec_parser

In normal operation, update_binary_decoded needs a JSON document representing the entire file contents as
input.  This can be inconvenient if you want to keep 99% of the content but just toggle one specific
parameter.   That's where the JSONpath support comes in handy:  You can specify a JSONpath to an element
inside the document as well as a new value for tat field:

Th below example demonstrates this by modifying the ofm field within EF.AD:

::

  pySIM-shell (MF/ADF.USIM/EF.AD)> read_binary_decoded
  {
      "ms_operation_mode": "normal",
      "specific_facilities": {
          "ofm": true
      },
      "len_of_mnc_in_imsi": 2
  }
  pySIM-shell (MF/ADF.USIM/EF.AD)> update_binary_decoded --json-path specific_facilities.ofm false
  pySIM-shell (MF/ADF.USIM/EF.AD)> read_binary_decoded
  {
      "ms_operation_mode": "normal",
      "specific_facilities": {
          "ofm": false
      },
      "len_of_mnc_in_imsi": 2
  }


edit_binary_decoded
~~~~~~~~~~~~~~~~~~~
This command will read the selected binary EF, decode it to its JSON representation, save
that JSON to a temporary file on your computer, and launch your configured text editor.

You may then perform whatever modifications to the JSON representation, save + leave your
text editor.

Afterwards, the modified JSON will be re-encoded to the binary format, and the result written
to the SIM card.

This allows for easy interactive modification of file contents.



BER-TLV EF commands
-------------------

BER-TLV EFs are files that contain BER-TLV structured data.  Every file can contain any number
of variable-length IEs (DOs).  The tag within a BER-TLV EF must be unique within the file.

The commands below become enabled only when your currently selected file is of *BER-TLV EF* type.

retrieve_tags
~~~~~~~~~~~~~

Retrieve a list of all tags present in the currently selected file.


retrieve_data
~~~~~~~~~~~~~
.. argparse::
   :module: pySim.filesystem
   :func: BerTlvEF.ShellCommands.retrieve_data_parser


set_data
~~~~~~~~
.. argparse::
   :module: pySim.filesystem
   :func: BerTlvEF.ShellCommands.set_data_parser


del_data
~~~~~~~~
.. argparse::
   :module: pySim.filesystem
   :func: BerTlvEF.ShellCommands.del_data_parser



USIM commands
-------------

authenticate
~~~~~~~~~~~~
.. argparse::
   :module: pySim.ts_31_102
   :func: ADF_USIM.AddlShellCommands.authenticate_parser



cmd2 settable parameters
------------------------

``cmd2`` has the concept of *settable parameters* which act a bit like environment variables in an OS-level
shell: They can be read and set, and they will influence the behavior somehow.

conserve_write
~~~~~~~~~~~~~~

If enabled, pySim will (when asked to write to a card) always first read the respective file/record and
verify if the to-be-written value differs from the current on-card value.  If not, the write will be skipped.
Writes will only be performed if the new value is different from the current on-card value.

If disabled, pySim will always write irrespective of the current/new value.

json_pretty_print
~~~~~~~~~~~~~~~~~

This parameter determines if generated JSON output should (by default) be pretty-printed (multi-line
output with indent level of 4 spaces) or not.

The default value of this parameter is 'true'.

debug
~~~~~

If enabled, full python back-traces will be displayed in case of exceptions

apdu_trace
~~~~~~~~~~

Boolean variable that determines if a hex-dump of the command + response APDU shall be printed.

numeric_path
~~~~~~~~~~~~

Boolean variable that determines if path (e.g. in prompt) is displayed with numeric FIDs or string names.

::

  pySIM-shell (MF/EF.ICCID)> set numeric_path True
  numeric_path - was: False
  now: True
  pySIM-shell (3f00/2fe2)> set numeric_path False
  numeric_path - was: True
  now: False
  pySIM-shell (MF/EF.ICCID)> help set