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/* Copyright 2020 sysmocom s.f.m.c. GmbH
* SPDX-License-Identifier: Apache-2.0 */
package org.osmocom.IMSIPseudo;
import org.osmocom.IMSIPseudo.MobileIdentity;
import sim.access.*;
import sim.toolkit.*;
import javacard.framework.*;
public class IMSIPseudo extends Applet implements ToolkitInterface, ToolkitConstants {
// DON'T DECLARE USELESS INSTANCE VARIABLES! They get saved to the EEPROM,
// which has a limited number of write cycles.
private byte STKServicesMenuId;
private SIMView gsmFile;
static byte[] LUCounter = new byte[] { '0', 'x', ' ', 'L', 'U' };
/* Main menu */
private static final byte[] title = new byte[] { 'I', 'M', 'S', 'I', ' ', 'P', 's', 'e', 'u', 'd', 'o', 'n', 'y', 'm',
'i', 'z', 'a', 't', 'i', 'o', 'n'};
private static final byte[] showLU = new byte[] {'S', 'h', 'o', 'w', ' ', 'L', 'U', ' ', 'c', 'o', 'u', 'n', 't', 'e', 'r'};
private static final byte[] showIMSI = new byte[] {'S', 'h', 'o', 'w', ' ', 'I', 'M', 'S', 'I'};
private static final byte[] changeIMSI = new byte[] {'C', 'h', 'a', 'n', 'g', 'e', ' ', 'I', 'M', 'S', 'I', ' '};
private final Object[] itemListMain = {title, showLU, showIMSI, changeIMSI};
/* Change IMSI menu */
private static final byte[] enterIMSI = new byte[] {'E', 'n', 't', 'e', 'r', ' ', 'I', 'M', 'S', 'I' };
private static final byte[] setDigit1 = new byte[] {'S', 'e', 't', ' ', '1', ' ', 'a', 's', ' ', 'l', 'a', 's', 't', ' ',
'd', 'i', 'g', 'i', 't'};
private static final byte[] setDigit2 = new byte[] {'S', 'e', 't', ' ', '2', ' ', 'a', 's', ' ', 'l', 'a', 's', 't', ' ',
'd', 'i', 'g', 'i', 't'};
private final Object[] itemListChangeIMSI = {changeIMSI, enterIMSI, setDigit1, setDigit2};
private IMSIPseudo() {
gsmFile = SIMSystem.getTheSIMView();
/* Register menu and trigger on location updates */
ToolkitRegistry reg = ToolkitRegistry.getEntry();
STKServicesMenuId = reg.initMenuEntry(title, (short)0, (short)title.length, PRO_CMD_SELECT_ITEM, false,
(byte)0, (short)0);
reg.setEvent(EVENT_EVENT_DOWNLOAD_LOCATION_STATUS);
}
public static void install(byte[] bArray, short bOffset, byte bLength) {
IMSIPseudo applet = new IMSIPseudo();
applet.register();
}
public void process(APDU arg0) throws ISOException {
if (selectingApplet())
return;
}
public void processToolkit(byte event) throws ToolkitException {
EnvelopeHandler envHdlr = EnvelopeHandler.getTheHandler();
if (event == EVENT_MENU_SELECTION) {
byte selectedItemId = envHdlr.getItemIdentifier();
if (selectedItemId == STKServicesMenuId) {
showMenu(itemListMain, (byte)4);
handleMenuResponseMain();
}
}
if (event == EVENT_EVENT_DOWNLOAD_LOCATION_STATUS) {
LUCounter[0]++;
showMsg(LUCounter);
}
}
private void showMenu(Object[] itemList, byte itemCount) {
ProactiveHandler proHdlr = ProactiveHandler.getTheHandler();
proHdlr.init((byte) PRO_CMD_SELECT_ITEM,(byte)0,DEV_ID_ME);
for (byte i=(byte)0;i<itemCount;i++) {
if (i == 0) {
/* Title */
proHdlr.appendTLV((byte)(TAG_ALPHA_IDENTIFIER | TAG_SET_CR), (byte[])itemList[i],
(short)0, (short)((byte[])itemList[i]).length);
} else {
/* Menu entry */
proHdlr.appendTLV((byte)(TAG_ITEM | TAG_SET_CR), (byte)i, (byte[])itemList[i], (short)0,
(short)((byte[])itemList[i]).length);
}
}
proHdlr.send();
}
private void showMsg(byte[] msg) {
ProactiveHandler proHdlr = ProactiveHandler.getTheHandler();
proHdlr.initDisplayText((byte)0, DCS_8_BIT_DATA, msg, (short)0, (short)(msg.length));
proHdlr.send();
}
private byte[] getResponse()
{
ProactiveResponseHandler rspHdlr = ProactiveResponseHandler.getTheHandler();
byte[] resp = new byte[rspHdlr.getTextStringLength()];
rspHdlr.copyTextString(resp, (short)0);
return resp;
}
private byte[] showMsgAndWaitKey(byte[] msg) {
ProactiveHandler proHdlr = ProactiveHandler.getTheHandler();
proHdlr.initGetInkey((byte)0, DCS_8_BIT_DATA, msg, (short)0, (short)(msg.length));
proHdlr.send();
return getResponse();
}
private byte[] prompt(byte[] msg, short minLen, short maxLen) {
/* if maxLen < 1, the applet crashes */
if (maxLen < 1)
maxLen = 1;
ProactiveHandler proHdlr = ProactiveHandler.getTheHandler();
proHdlr.initGetInput((byte)0, DCS_8_BIT_DATA, msg, (short)0, (short)(msg.length), minLen, maxLen);
proHdlr.send();
return getResponse();
}
private void showError(short code) {
byte[] msg = new byte[] {'E', '?', '?'};
msg[1] = (byte)('0' + code / 10);
msg[2] = (byte)('0' + code % 10);
showMsg(msg);
}
private byte nibble2hex(byte nibble)
{
nibble = (byte)(nibble & 0xf);
if (nibble < 0xa)
return (byte)('0' + nibble);
else
return (byte)('a' + nibble - 0xa);
}
private byte[] hexdump(byte data[])
{
byte res[] = new byte[(byte)(data.length*2)];
for (byte i = 0; i < data.length; i++) {
res[(byte)(i*2)] = nibble2hex((byte)(data[i] >> 4));
res[(byte)(i*2 + 1)] = nibble2hex(data[i]);
}
return res;
}
private void showIMSI() {
/* 3GPP TS 31.102 4.2.2: IMSI */
byte[] msg = {'C', 'u', 'r', 'r', 'e', 'n', 't', ' ', 'I', 'M', 'S', 'I', ':', ' ',
' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '};
try {
byte IMSI[] = readIMSI();
MobileIdentity.mi2str(msg, (byte)14, (byte)16, IMSI, false);
showMsgAndWaitKey(msg);
} catch (SIMViewException e) {
showError(e.getReason());
}
}
private void handleMenuResponseMain() {
ProactiveResponseHandler rspHdlr = ProactiveResponseHandler.getTheHandler();
switch (rspHdlr.getItemIdentifier()) {
case 1: /* Show LU counter */
showMsg(LUCounter);
break;
case 2: /* Show IMSI */
showIMSI();
break;
case 3: /* Change IMSI */
showMenu(itemListChangeIMSI, (byte)4);
handleMenuResponseChangeIMSI();
break;
}
}
private void handleMenuResponseChangeIMSI() {
ProactiveResponseHandler rspHdlr = ProactiveResponseHandler.getTheHandler();
switch (rspHdlr.getItemIdentifier()) {
case 1: /* enter IMSI */
promptIMSI();
break;
case 2: /* set last digit to 1 */
promptIMSI();
break;
case 3: /* set last digit to 2 */
promptIMSI();
break;
}
}
private void promptIMSI()
{
byte[] msg = {'N', 'e', 'w', ' ', 'I', 'M', 'S', 'I', '?'};
byte imsi[] = prompt(msg, (short)0, (short)15);
/* The IMSI file should be 9 bytes long, even if the IMSI is shorter */
byte mi[];
try {
mi = MobileIdentity.str2mi(imsi, MobileIdentity.MI_IMSI, (byte)9);
showMsgAndWaitKey(hexdump(mi));
} catch (Exception e) {
byte err[] = {'E', 'R', 'R' };
showMsgAndWaitKey(err);
}
}
private byte[] readIMSI()
{
gsmFile.select((short) SIMView.FID_DF_GSM);
gsmFile.select((short) SIMView.FID_EF_IMSI);
byte[] IMSI = new byte[9];
gsmFile.readBinary((short)0, IMSI, (short)0, (short)9);
return IMSI;
}
private void writeIMSI(byte mi[])
{
gsmFile.select((short) SIMView.FID_DF_GSM);
gsmFile.select((short) SIMView.FID_EF_IMSI);
gsmFile.updateBinary((short)0, mi, (short)0, (short)mi.length);
}
}
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