Jan Nordqvist | ee699a6 | 2016-02-05 15:30:26 -0800 | [diff] [blame] | 1 | package com.android.configparse; |
| 2 | |
| 3 | import android.content.Context; |
| 4 | import android.net.Uri; |
| 5 | import android.net.wifi.WifiConfiguration; |
| 6 | import android.net.wifi.WifiEnterpriseConfig; |
| 7 | import android.util.Base64; |
| 8 | import android.util.Log; |
| 9 | |
| 10 | import com.android.anqp.eap.AuthParam; |
| 11 | import com.android.anqp.eap.EAP; |
| 12 | import com.android.anqp.eap.EAPMethod; |
| 13 | import com.android.anqp.eap.NonEAPInnerAuth; |
| 14 | import com.android.hotspot2.IMSIParameter; |
| 15 | import com.android.hotspot2.pps.Credential; |
| 16 | import com.android.hotspot2.pps.HomeSP; |
| 17 | |
| 18 | import java.io.IOException; |
| 19 | import java.security.GeneralSecurityException; |
| 20 | import java.security.MessageDigest; |
| 21 | import java.security.PrivateKey; |
| 22 | import java.security.cert.X509Certificate; |
| 23 | import java.util.Arrays; |
| 24 | import java.util.HashSet; |
| 25 | import java.util.List; |
| 26 | |
| 27 | public class ConfigBuilder { |
| 28 | private static final String TAG = "WCFG"; |
| 29 | |
| 30 | private static void dropFile(Uri uri, Context context) { |
| 31 | context.getContentResolver().delete(uri, null, null); |
| 32 | } |
| 33 | |
| 34 | public static WifiConfiguration buildConfig(HomeSP homeSP, X509Certificate caCert, |
| 35 | List<X509Certificate> clientChain, PrivateKey key) |
| 36 | throws IOException, GeneralSecurityException { |
| 37 | |
| 38 | Credential credential = homeSP.getCredential(); |
| 39 | |
| 40 | WifiConfiguration config; |
| 41 | |
| 42 | EAP.EAPMethodID eapMethodID = credential.getEAPMethod().getEAPMethodID(); |
| 43 | switch (eapMethodID) { |
| 44 | case EAP_TTLS: |
| 45 | if (key != null || clientChain != null) { |
| 46 | Log.w(TAG, "Client cert and/or key included with EAP-TTLS profile"); |
| 47 | } |
| 48 | config = buildTTLSConfig(homeSP); |
| 49 | break; |
| 50 | case EAP_TLS: |
| 51 | config = buildTLSConfig(homeSP, clientChain, key); |
| 52 | break; |
| 53 | case EAP_AKA: |
| 54 | case EAP_AKAPrim: |
| 55 | case EAP_SIM: |
| 56 | if (key != null || clientChain != null || caCert != null) { |
| 57 | Log.i(TAG, "Client/CA cert and/or key included with " + |
| 58 | eapMethodID + " profile"); |
| 59 | } |
| 60 | config = buildSIMConfig(homeSP); |
| 61 | break; |
| 62 | default: |
| 63 | throw new IOException("Unsupported EAP Method: " + eapMethodID); |
| 64 | } |
| 65 | |
| 66 | WifiEnterpriseConfig enterpriseConfig = config.enterpriseConfig; |
| 67 | |
| 68 | enterpriseConfig.setCaCertificate(caCert); |
| 69 | enterpriseConfig.setAnonymousIdentity("anonymous@" + credential.getRealm()); |
| 70 | |
| 71 | return config; |
| 72 | } |
| 73 | |
| 74 | // Retain for debugging purposes |
| 75 | /* |
| 76 | private static void xIterateCerts(KeyStore ks, X509Certificate caCert) |
| 77 | throws GeneralSecurityException { |
| 78 | Enumeration<String> aliases = ks.aliases(); |
| 79 | while (aliases.hasMoreElements()) { |
| 80 | String alias = aliases.nextElement(); |
| 81 | Certificate cert = ks.getCertificate(alias); |
| 82 | Log.d("HS2J", "Checking " + alias); |
| 83 | if (cert instanceof X509Certificate) { |
| 84 | X509Certificate x509Certificate = (X509Certificate) cert; |
| 85 | boolean sm = x509Certificate.getSubjectX500Principal().equals( |
| 86 | caCert.getSubjectX500Principal()); |
| 87 | boolean eq = false; |
| 88 | if (sm) { |
| 89 | eq = Arrays.equals(x509Certificate.getEncoded(), caCert.getEncoded()); |
| 90 | } |
| 91 | Log.d("HS2J", "Subject: " + x509Certificate.getSubjectX500Principal() + |
| 92 | ": " + sm + "/" + eq); |
| 93 | } |
| 94 | } |
| 95 | } |
| 96 | */ |
| 97 | |
| 98 | private static WifiConfiguration buildTTLSConfig(HomeSP homeSP) |
| 99 | throws IOException { |
| 100 | Credential credential = homeSP.getCredential(); |
| 101 | |
| 102 | if (credential.getUserName() == null || credential.getPassword() == null) { |
| 103 | throw new IOException("EAP-TTLS provisioned without user name or password"); |
| 104 | } |
| 105 | |
| 106 | EAPMethod eapMethod = credential.getEAPMethod(); |
| 107 | |
| 108 | AuthParam authParam = eapMethod.getAuthParam(); |
| 109 | if (authParam == null || |
| 110 | authParam.getAuthInfoID() != EAP.AuthInfoID.NonEAPInnerAuthType) { |
| 111 | throw new IOException("Bad auth parameter for EAP-TTLS: " + authParam); |
| 112 | } |
| 113 | |
| 114 | WifiConfiguration config = buildBaseConfiguration(homeSP); |
| 115 | NonEAPInnerAuth ttlsParam = (NonEAPInnerAuth) authParam; |
| 116 | WifiEnterpriseConfig enterpriseConfig = config.enterpriseConfig; |
| 117 | enterpriseConfig.setPhase2Method(remapInnerMethod(ttlsParam.getType())); |
| 118 | enterpriseConfig.setIdentity(credential.getUserName()); |
| 119 | enterpriseConfig.setPassword(credential.getPassword()); |
| 120 | |
| 121 | return config; |
| 122 | } |
| 123 | |
| 124 | private static WifiConfiguration buildTLSConfig(HomeSP homeSP, |
| 125 | List<X509Certificate> clientChain, |
| 126 | PrivateKey clientKey) |
| 127 | throws IOException, GeneralSecurityException { |
| 128 | |
| 129 | Credential credential = homeSP.getCredential(); |
| 130 | |
| 131 | X509Certificate clientCertificate = null; |
| 132 | |
| 133 | if (clientKey == null || clientChain == null) { |
| 134 | throw new IOException("No key and/or cert passed for EAP-TLS"); |
| 135 | } |
| 136 | if (credential.getCertType() != Credential.CertType.x509v3) { |
| 137 | throw new IOException("Invalid certificate type for TLS: " + |
| 138 | credential.getCertType()); |
| 139 | } |
| 140 | |
| 141 | byte[] reference = credential.getFingerPrint(); |
| 142 | MessageDigest digester = MessageDigest.getInstance("SHA-256"); |
| 143 | for (X509Certificate certificate : clientChain) { |
| 144 | digester.reset(); |
| 145 | byte[] fingerprint = digester.digest(certificate.getEncoded()); |
| 146 | if (Arrays.equals(reference, fingerprint)) { |
| 147 | clientCertificate = certificate; |
| 148 | break; |
| 149 | } |
| 150 | } |
| 151 | if (clientCertificate == null) { |
| 152 | throw new IOException("No certificate in chain matches supplied fingerprint"); |
| 153 | } |
| 154 | |
| 155 | String alias = Base64.encodeToString(reference, Base64.DEFAULT); |
| 156 | |
| 157 | WifiConfiguration config = buildBaseConfiguration(homeSP); |
| 158 | WifiEnterpriseConfig enterpriseConfig = config.enterpriseConfig; |
| 159 | enterpriseConfig.setClientCertificateAlias(alias); |
| 160 | enterpriseConfig.setClientKeyEntry(clientKey, clientCertificate); |
| 161 | |
| 162 | return config; |
| 163 | } |
| 164 | |
| 165 | private static WifiConfiguration buildSIMConfig(HomeSP homeSP) |
| 166 | throws IOException { |
| 167 | |
| 168 | Credential credential = homeSP.getCredential(); |
| 169 | IMSIParameter credImsi = credential.getImsi(); |
| 170 | |
| 171 | /* |
| 172 | * Uncomment to enforce strict IMSI matching with currently installed SIM cards. |
| 173 | * |
| 174 | TelephonyManager tm = TelephonyManager.from(context); |
| 175 | SubscriptionManager sub = SubscriptionManager.from(context); |
| 176 | boolean match = false; |
| 177 | |
| 178 | for (int subId : sub.getActiveSubscriptionIdList()) { |
| 179 | String imsi = tm.getSubscriberId(subId); |
| 180 | if (credImsi.matches(imsi)) { |
| 181 | match = true; |
| 182 | break; |
| 183 | } |
| 184 | } |
| 185 | if (!match) { |
| 186 | throw new IOException("Supplied IMSI does not match any SIM card"); |
| 187 | } |
| 188 | */ |
| 189 | |
| 190 | WifiConfiguration config = buildBaseConfiguration(homeSP); |
| 191 | config.enterpriseConfig.setPlmn(credImsi.toString()); |
| 192 | return config; |
| 193 | } |
| 194 | |
| 195 | private static WifiConfiguration buildBaseConfiguration(HomeSP homeSP) throws IOException { |
| 196 | EAP.EAPMethodID eapMethodID = homeSP.getCredential().getEAPMethod().getEAPMethodID(); |
| 197 | |
| 198 | WifiConfiguration config = new WifiConfiguration(); |
| 199 | |
| 200 | config.FQDN = homeSP.getFQDN(); |
| 201 | |
| 202 | HashSet<Long> roamingConsortiumIds = homeSP.getRoamingConsortiums(); |
| 203 | config.roamingConsortiumIds = new long[roamingConsortiumIds.size()]; |
| 204 | int i = 0; |
| 205 | for (long id : roamingConsortiumIds) { |
| 206 | config.roamingConsortiumIds[i] = id; |
| 207 | i++; |
| 208 | } |
| 209 | config.providerFriendlyName = homeSP.getFriendlyName(); |
| 210 | |
| 211 | config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_EAP); |
| 212 | config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.IEEE8021X); |
| 213 | |
| 214 | WifiEnterpriseConfig enterpriseConfig = new WifiEnterpriseConfig(); |
| 215 | enterpriseConfig.setEapMethod(remapEAPMethod(eapMethodID)); |
| 216 | enterpriseConfig.setRealm(homeSP.getCredential().getRealm()); |
| 217 | if (homeSP.getUpdateIdentifier() >= 0) { |
| 218 | config.updateIdentifier = Integer.toString(homeSP.getUpdateIdentifier()); |
| 219 | } |
| 220 | config.enterpriseConfig = enterpriseConfig; |
| 221 | if (homeSP.getUpdateIdentifier() >= 0) { |
| 222 | config.updateIdentifier = Integer.toString(homeSP.getUpdateIdentifier()); |
| 223 | } |
| 224 | |
| 225 | return config; |
| 226 | } |
| 227 | |
| 228 | private static int remapEAPMethod(EAP.EAPMethodID eapMethodID) throws IOException { |
| 229 | switch (eapMethodID) { |
| 230 | case EAP_TTLS: |
| 231 | return WifiEnterpriseConfig.Eap.TTLS; |
| 232 | case EAP_TLS: |
| 233 | return WifiEnterpriseConfig.Eap.TLS; |
| 234 | case EAP_SIM: |
| 235 | return WifiEnterpriseConfig.Eap.SIM; |
| 236 | case EAP_AKA: |
| 237 | return WifiEnterpriseConfig.Eap.AKA; |
| 238 | case EAP_AKAPrim: |
| 239 | return WifiEnterpriseConfig.Eap.AKA_PRIME; |
| 240 | default: |
| 241 | throw new IOException("Bad EAP method: " + eapMethodID); |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | private static int remapInnerMethod(NonEAPInnerAuth.NonEAPType type) throws IOException { |
| 246 | switch (type) { |
| 247 | case PAP: |
| 248 | return WifiEnterpriseConfig.Phase2.PAP; |
| 249 | case MSCHAP: |
| 250 | return WifiEnterpriseConfig.Phase2.MSCHAP; |
| 251 | case MSCHAPv2: |
| 252 | return WifiEnterpriseConfig.Phase2.MSCHAPV2; |
| 253 | case CHAP: |
| 254 | default: |
| 255 | throw new IOException("Inner method " + type + " not supported"); |
| 256 | } |
| 257 | } |
| 258 | } |