1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.server.wifi.util; 18 19 import android.content.Context; 20 import android.net.wifi.WifiConfiguration; 21 import android.net.wifi.WifiEnterpriseConfig; 22 import android.telephony.TelephonyManager; 23 24 /** 25 * Utilities for the Wifi Service to interact with telephony. 26 */ 27 public class TelephonyUtil { 28 29 /** 30 * Get the identity for the current SIM or null if the sim is not available 31 */ getSimIdentity(Context context, int eapMethod)32 public static String getSimIdentity(Context context, int eapMethod) { 33 TelephonyManager tm = TelephonyManager.from(context); 34 if (tm != null) { 35 String imsi = tm.getSubscriberId(); 36 String mccMnc = ""; 37 38 if (tm.getSimState() == TelephonyManager.SIM_STATE_READY) { 39 mccMnc = tm.getSimOperator(); 40 } 41 42 return buildIdentity(eapMethod, imsi, mccMnc); 43 } else { 44 return null; 45 } 46 } 47 48 /** 49 * create Permanent Identity base on IMSI, 50 * 51 * rfc4186 & rfc4187: 52 * identity = usernam@realm 53 * with username = prefix | IMSI 54 * and realm is derived MMC/MNC tuple according 3GGP spec(TS23.003) 55 */ buildIdentity(int eapMethod, String imsi, String mccMnc)56 private static String buildIdentity(int eapMethod, String imsi, String mccMnc) { 57 if (imsi == null || imsi.isEmpty()) { 58 return null; 59 } 60 61 String prefix; 62 if (eapMethod == WifiEnterpriseConfig.Eap.SIM) { 63 prefix = "1"; 64 } else if (eapMethod == WifiEnterpriseConfig.Eap.AKA) { 65 prefix = "0"; 66 } else if (eapMethod == WifiEnterpriseConfig.Eap.AKA_PRIME) { 67 prefix = "6"; 68 } else { // not a valide EapMethod 69 return null; 70 } 71 72 /* extract mcc & mnc from mccMnc */ 73 String mcc; 74 String mnc; 75 if (mccMnc != null && !mccMnc.isEmpty()) { 76 mcc = mccMnc.substring(0, 3); 77 mnc = mccMnc.substring(3); 78 if (mnc.length() == 2) { 79 mnc = "0" + mnc; 80 } 81 } else { 82 // extract mcc & mnc from IMSI, assume mnc size is 3 83 mcc = imsi.substring(0, 3); 84 mnc = imsi.substring(3, 6); 85 } 86 87 return prefix + imsi + "@wlan.mnc" + mnc + ".mcc" + mcc + ".3gppnetwork.org"; 88 } 89 90 /** 91 * Checks if the network is a sim config. 92 * 93 * @param config Config corresponding to the network. 94 * @return true if it is a sim config, false otherwise. 95 */ isSimConfig(WifiConfiguration config)96 public static boolean isSimConfig(WifiConfiguration config) { 97 if (config == null || config.enterpriseConfig == null) { 98 return false; 99 } 100 101 return isSimEapMethod(config.enterpriseConfig.getEapMethod()); 102 } 103 104 /** 105 * Checks if the network is a sim config. 106 * 107 * @param method 108 * @return true if it is a sim config, false otherwise. 109 */ isSimEapMethod(int eapMethod)110 public static boolean isSimEapMethod(int eapMethod) { 111 return eapMethod == WifiEnterpriseConfig.Eap.SIM 112 || eapMethod == WifiEnterpriseConfig.Eap.AKA 113 || eapMethod == WifiEnterpriseConfig.Eap.AKA_PRIME; 114 } 115 } 116