| /* 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); |
| } |
| } |