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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 = { '0', 'x', ' ', 'L', 'U' };
/* Main menu */
private static final byte[] title = { '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 = {'S', 'h', 'o', 'w', ' ', 'L', 'U', ' ', 'c', 'o', 'u', 'n', 't', 'e', 'r'};
private static final byte[] changeIMSI = {'C', 'h', 'a', 'n', 'g', 'e', ' ', 'I', 'M', 'S', 'I'};
private static final byte[] invalidIMSI = {'I', 'n', 'v', 'a', 'l', 'i', 'd', ' ', 'I', 'M', 'S', 'I'};
private static final byte[] noChange = {'N', 'o', ' ', 'c', 'h', 'a', 'n', 'g', 'e'};
private static final byte[] changed = {'I', 'M', 'S', 'I', ' ', 'c', 'h', 'a', 'n', 'g', 'e', 'd', '!'};
private static final byte error[] = {'E', 'R', 'R', 'O', 'R' };
private final Object[] itemListMain = {title, showLU, changeIMSI};
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);
handleMenuResponseMain();
}
}
if (event == EVENT_EVENT_DOWNLOAD_LOCATION_STATUS) {
LUCounter[0]++;
showMsg(LUCounter);
}
}
private void showMenu(Object[] itemList) {
ProactiveHandler proHdlr = ProactiveHandler.getTheHandler();
proHdlr.init((byte) PRO_CMD_SELECT_ITEM,(byte)0,DEV_ID_ME);
for (byte i=(byte)0; i < itemList.length; 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;
}
/*
This was used to find out that the first byte of a text field seems to be 4.
private byte[] getResponseDBG()
{
ProactiveResponseHandler rspHdlr;
byte resp[];
byte strlen = -1;
rspHdlr = ProactiveResponseHandler.getTheHandler();
for (byte occurence = 1; occurence <= 3; occurence++) {
short len;
try {
if (rspHdlr.findTLV(TAG_TEXT_STRING, (byte)occurence) != TLV_NOT_FOUND) {
if ((len = rspHdlr.getValueLength()) > 1) {
len = 3;
resp = new byte[len];
rspHdlr.copyValue((short)0, resp, (short)0, (short)(len));
showMsg(resp);
showMsgAndWaitKey(Bytes.hexdump(resp));
return resp;
}
}
} catch (Exception e) {
showError((short)(30 + occurence));
return null;
}
}
showError((short)(39));
return null;
}
*/
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, byte[] prefillVal, 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);
if (prefillVal != null && prefillVal.length > 0) {
/* appendTLV() expects the first byte to be some header before the actual text.
* At first I thought it was the value's length, but turned out to only work for lengths under 8...
* In the end I reversed the value 4 from the first byte read by rspHdlr.copyValue() for
* TAG_TEXT_STRING fields. As long as we write 4 into the first byte, things just work out,
* apparently.
* Fucking well could have said so in the API docs, too; oh the brain damage, oh the hours wasted.
* This is the appendTLV() variant that writes one byte ahead of writing an array: */
proHdlr.appendTLV((byte)(TAG_DEFAULT_TEXT), (byte)4, prefillVal, (short)0,
(short)(prefillVal.length));
}
proHdlr.send();
return getResponse();
}
private void showError(short code) {
byte[] msg = {'E', '?', '?'};
msg[1] = (byte)('0' + code / 10);
msg[2] = (byte)('0' + code % 10);
showMsg(msg);
}
private void handleMenuResponseMain() {
ProactiveResponseHandler rspHdlr = ProactiveResponseHandler.getTheHandler();
switch (rspHdlr.getItemIdentifier()) {
case 1: /* Show LU counter */
showMsg(LUCounter);
break;
case 2: /* Change IMSI */
byte prevIMSI_mi[] = readIMSI();
byte prevIMSI_str[] = MobileIdentity.mi2str(prevIMSI_mi);
promptIMSI(prevIMSI_str);
break;
}
}
private void promptIMSI(byte prevIMSI_str[])
{
byte newIMSI_str[] = prevIMSI_str;
try {
newIMSI_str = prompt(changeIMSI, newIMSI_str, (short)0, (short)15);
} catch (Exception e) {
showError((short)40);
return;
}
if (newIMSI_str.length < 6 || newIMSI_str.length > 15
|| !Bytes.isDigit(newIMSI_str)) {
showMsg(invalidIMSI);
return;
}
if (Bytes.equals(newIMSI_str, prevIMSI_str)) {
showMsg(noChange);
return;
}
byte mi[];
try {
/* The IMSI file should be 9 bytes long, even if the IMSI is shorter */
mi = MobileIdentity.str2mi(newIMSI_str, MobileIdentity.MI_IMSI, (byte)9);
writeIMSI(mi);
showMsg(changed);
} catch (Exception e) {
showError((short)42);
}
}
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[]) throws Exception
{
if (mi.length != 9)
throw new Exception();
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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