Brian Waters | 13d9601 | 2017-12-08 16:53:31 -0600 | [diff] [blame^] | 1 | /***************************************************************************************************** |
| 2 | * Software License Agreement (BSD License) |
| 3 | * Author : Souheil Ben Ayed <souheil@tera.ics.keio.ac.jp> |
| 4 | * |
| 5 | * Copyright (c) 2009-2010, Souheil Ben Ayed, Teraoka Laboratory of Keio University, and the WIDE Project |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use of this software in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions are met: |
| 10 | * |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * |
| 18 | * 3. All advertising materials mentioning features or use of this software |
| 19 | * must display the following acknowledgement: |
| 20 | * This product includes software developed by Souheil Ben Ayed <souheil@tera.ics.keio.ac.jp>. |
| 21 | * |
| 22 | * 4. Neither the name of Souheil Ben Ayed, Teraoka Laboratory of Keio University or the WIDE Project nor the |
| 23 | * names of its contributors may be used to endorse or promote products |
| 24 | * derived from this software without specific prior written permission. |
| 25 | * |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ''AS IS'' AND ANY |
| 27 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| 28 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 29 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY |
| 30 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| 31 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 32 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| 33 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 34 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 35 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 36 | *****************************************************************************************************/ |
| 37 | |
| 38 | |
| 39 | #include "eap_tls.h" |
| 40 | |
| 41 | int eap_tls_configure(char * configfile); |
| 42 | int eap_tls_init(struct eap_state_machine *smd); |
| 43 | int eap_tls_initPickUp(struct eap_state_machine *smd); |
| 44 | int eap_tls_buildReq(struct eap_state_machine *smd, u8 eap_md5, |
| 45 | struct eap_packet * eapPacket); |
| 46 | int eap_tls_getTimeout(struct eap_state_machine *smd, int * timeout); |
| 47 | boolean eap_tls_check(struct eap_state_machine *smd, |
| 48 | struct eap_packet *eapRespData); |
| 49 | int eap_tls_process(struct eap_state_machine *smd, |
| 50 | struct eap_packet *eapRespData); |
| 51 | boolean eap_tls_isDone(struct eap_state_machine *smd); |
| 52 | int eap_tls_getKey(struct eap_state_machine *smd, u8** msk, int * msklen, u8** emsk, int * emsklen); |
| 53 | void eap_tls_unregister(void); |
| 54 | void eap_tls_free(void * data); |
| 55 | |
| 56 | REGISTER_METHOD("eap_tls", "eap_tls_configure", "eap_tls_init", "eap_tls_initPickUp", "eap_tls_buildReq", "eap_tls_getTimeout", "eap_tls_check", "eap_tls_process", "eap_tls_isDone", "eap_tls_getKey", "eap_tls_unregister", "eap_tls_free") |
| 57 | ; |
| 58 | |
| 59 | int eap_tls_configure(char * configfile) |
| 60 | { |
| 61 | int ret; |
| 62 | extern FILE * eaptlsin; |
| 63 | |
| 64 | if (configfile) |
| 65 | { |
| 66 | tls_global_conf.conffile = configfile; |
| 67 | } |
| 68 | tls_global_conf.certfile = NULL; |
| 69 | tls_global_conf.keyfile = NULL; |
| 70 | tls_global_conf.cafile = NULL; |
| 71 | tls_global_conf.crlfile = NULL; |
| 72 | tls_global_conf.check_cert_cn_username = FALSE; |
| 73 | |
| 74 | /*Parse EAP TLS configuration file */ |
| 75 | eaptlsin = fopen(tls_global_conf.conffile, "r"); |
| 76 | if (!eaptlsin) |
| 77 | { |
| 78 | TRACE_DEBUG(INFO,"%s[EAP TLS plugin] Unable to open configuration file %s for reading: %s",DIAMEAP_EXTENSION, tls_global_conf.conffile, strerror(errno)); |
| 79 | return errno; |
| 80 | } |
| 81 | |
| 82 | /* call yacc parser */ |
| 83 | CHECK_FCT(eaptlsparse(&tls_global_conf)); |
| 84 | |
| 85 | |
| 86 | tls_global_conf.max_size = 64*1024 /* As per RFC 5216 recommendation */; |
| 87 | |
| 88 | /* Initializing GnuTLS library */ |
| 89 | ret = diameap_tls_init(&tls_global_conf); |
| 90 | |
| 91 | return ret; |
| 92 | } |
| 93 | |
| 94 | int eap_tls_init(struct eap_state_machine *smd) |
| 95 | { |
| 96 | int ret; |
| 97 | struct tls_data *data = NULL; |
| 98 | CHECK_MALLOC(data = malloc(sizeof(struct tls_data))); |
| 99 | memset(data, 0, sizeof(struct tls_data)); |
| 100 | CHECK_FCT(diameap_tls_initialize(data)); |
| 101 | ret = diameap_tls_init_session(&tls_global_conf, data); |
| 102 | |
| 103 | smd->methodData = (struct tls_data*) data; |
| 104 | if (ret < 0) |
| 105 | { |
| 106 | return ret; |
| 107 | } |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | int eap_tls_initPickUp(struct eap_state_machine *smd) |
| 112 | { |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | int eap_tls_buildReq(struct eap_state_machine *smd, u8 id, |
| 117 | struct eap_packet * eapPacket) |
| 118 | { |
| 119 | struct tls_data * data; |
| 120 | data = (struct tls_data *) smd->methodData; |
| 121 | |
| 122 | if (data->more_toreceive == TRUE) |
| 123 | { |
| 124 | CHECK_FCT(diameap_eap_tls_buildReq_ack(id,eapPacket)); |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | if (data->state == START) |
| 129 | { |
| 130 | CHECK_FCT(diameap_eap_tls_buildReq_start(id,eapPacket)); |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | if (data->state == CONTINUE) |
| 135 | { |
| 136 | diameap_eap_tls_buildReq_data(data, id, eapPacket); |
| 137 | |
| 138 | smd->methodData = (struct tls_data*) data; |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | return 0; |
| 143 | } |
| 144 | |
| 145 | int eap_tls_getTimeout(struct eap_state_machine *smd, int * timeout) |
| 146 | { |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | boolean eap_tls_check(struct eap_state_machine *smd, |
| 151 | struct eap_packet *eapRespData) |
| 152 | { |
| 153 | eap_type type; |
| 154 | if(diameap_eap_get_type(eapRespData,&type)!=0){ |
| 155 | goto cf; |
| 156 | } |
| 157 | if (type == TYPE_EAP_TLS) |
| 158 | { |
| 159 | return TRUE; |
| 160 | } |
| 161 | cf: |
| 162 | TRACE_DEBUG(INFO,"%s[EAP TLS plugin] EAP-TLS check failed: Received EAP packet with different EAP-Type (Type = %d)",DIAMEAP_EXTENSION, type); |
| 163 | return FALSE; |
| 164 | } |
| 165 | |
| 166 | int eap_tls_process(struct eap_state_machine *smd, |
| 167 | struct eap_packet *eapRespData) |
| 168 | { |
| 169 | struct tls_data * data; |
| 170 | data = (struct tls_data *) smd->methodData; |
| 171 | struct tls_msg tlsmsg; |
| 172 | CHECK_FCT(diameap_eap_tls_parse(&tlsmsg,eapRespData)); |
| 173 | |
| 174 | if ((tlsmsg.datalength == 0)) |
| 175 | { |
| 176 | if (data->more_tosend_length > 0) |
| 177 | { |
| 178 | //ACK and more to send |
| 179 | return 0; |
| 180 | } |
| 181 | else |
| 182 | { |
| 183 | //Success |
| 184 | if (data->handshake == TRUE) |
| 185 | { |
| 186 | data->state = SUCCESS; |
| 187 | smd->user.success = TRUE; |
| 188 | |
| 189 | if(tls_global_conf.check_cert_cn_username == TRUE){ |
| 190 | unsigned int list_size; |
| 191 | const gnutls_datum_t * list = gnutls_certificate_get_peers (data->session, &list_size); |
| 192 | if(list_size<1){ |
| 193 | goto failure; |
| 194 | } |
| 195 | |
| 196 | gnutls_x509_crt_t cert; |
| 197 | |
| 198 | CHECK_GNUTLS_DO(gnutls_x509_crt_init(&cert),{ |
| 199 | TRACE_DEBUG(NONE,"%s[EAP TLS plugin] [GnuTLS] error in initialization crt init",DIAMEAP_EXTENSION); |
| 200 | goto failure;}); |
| 201 | |
| 202 | CHECK_GNUTLS_DO(gnutls_x509_crt_import(cert, &list[0], GNUTLS_X509_FMT_DER), { |
| 203 | TRACE_DEBUG(NONE,"%s[EAP TLS plugin] [GnuTLS] error parsing certificate",DIAMEAP_EXTENSION); |
| 204 | goto failure;}); |
| 205 | |
| 206 | void * buff; |
| 207 | size_t size_buffer; |
| 208 | int ret; |
| 209 | ret = gnutls_x509_crt_get_dn_by_oid(cert,GNUTLS_OID_X520_COMMON_NAME,0,0,NULL,&size_buffer); |
| 210 | if( ret != GNUTLS_E_SHORT_MEMORY_BUFFER){ |
| 211 | CHECK_GNUTLS_DO(ret,{ |
| 212 | TRACE_DEBUG(NONE,"%s[EAP TLS plugin] [GnuTLS] error get dn by oid",DIAMEAP_EXTENSION); |
| 213 | goto failure;}); |
| 214 | } |
| 215 | |
| 216 | CHECK_MALLOC_DO(buff=malloc(size_buffer), goto failure); |
| 217 | |
| 218 | CHECK_GNUTLS_DO(gnutls_x509_crt_get_dn_by_oid(cert,GNUTLS_OID_X520_COMMON_NAME,0,0,buff,&size_buffer),{ |
| 219 | TRACE_DEBUG(NONE,"%s[EAP TLS plugin] [GnuTLS] error get dn by oid",DIAMEAP_EXTENSION); |
| 220 | goto failure;}); |
| 221 | |
| 222 | if(strncmp((char *)smd->user.userid,buff,smd->user.useridLength)!=0){ |
| 223 | goto failure; |
| 224 | } |
| 225 | |
| 226 | gnutls_x509_crt_deinit(cert); |
| 227 | goto next; |
| 228 | |
| 229 | failure: |
| 230 | TRACE_DEBUG(NONE,"%s[EAP TLS plugin] Checking failed. certificate's CN does not match User_Name AVP value.",DIAMEAP_EXTENSION); |
| 231 | data->state = FAILURE; |
| 232 | smd->user.success = FALSE; |
| 233 | gnutls_x509_crt_deinit(cert); |
| 234 | } |
| 235 | |
| 236 | next: |
| 237 | smd->methodData = (struct tls_data*) data; |
| 238 | return 0; |
| 239 | |
| 240 | } |
| 241 | |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | } |
| 246 | |
| 247 | if (data->more_toreceive == TRUE) |
| 248 | { |
| 249 | //reassemble received fragment to TLS Response |
| 250 | CHECK_FCT(diameap_tls_reassemble(&data->tlsResp,tlsmsg)); |
| 251 | } |
| 252 | else |
| 253 | { |
| 254 | //receive the first fragment or a complete TLS message |
| 255 | CHECK_FCT(diameap_tls_copy(&data->tlsResp,tlsmsg)); |
| 256 | } |
| 257 | |
| 258 | if (tlsmsg.flags & TLS_FLAG_MORE) |
| 259 | { |
| 260 | data->more_toreceive = TRUE; |
| 261 | smd->methodData = (struct tls_data*) data; |
| 262 | return 0; |
| 263 | } |
| 264 | else |
| 265 | { |
| 266 | //last fragment received |
| 267 | data->more_toreceive = FALSE; |
| 268 | } |
| 269 | data->state = CONTINUE; |
| 270 | diameap_tls_process_receive(data); |
| 271 | |
| 272 | if (data->state == SUCCESS) |
| 273 | { |
| 274 | smd->user.success = TRUE; |
| 275 | } |
| 276 | smd->methodData = (struct tls_data*) data; |
| 277 | return 0; |
| 278 | } |
| 279 | |
| 280 | boolean eap_tls_isDone(struct eap_state_machine *smd) |
| 281 | { |
| 282 | struct tls_data * data; |
| 283 | data = (struct tls_data *) smd->methodData; |
| 284 | if (data->state == CONTINUE || data->state == START) |
| 285 | { |
| 286 | return FALSE; |
| 287 | } |
| 288 | return TRUE; |
| 289 | } |
| 290 | |
| 291 | int eap_tls_getKey(struct eap_state_machine *smd, u8 ** msk, int *msklen, u8 ** emsk, int *emsklen) |
| 292 | { |
| 293 | struct tls_data * data; |
| 294 | int len = emsk ? 128 : 64; |
| 295 | data = (struct tls_data *) smd->methodData; |
| 296 | *msk = malloc(len); |
| 297 | if (gnutls_prf(data->session, strlen("client EAP encryption"), |
| 298 | "client EAP encryption", 0, 0, NULL, len, (char *) *msk) |
| 299 | != GNUTLS_E_SUCCESS) |
| 300 | { |
| 301 | free(*msk); |
| 302 | *msk = NULL; |
| 303 | *msklen = 0; |
| 304 | return 1; |
| 305 | } |
| 306 | else |
| 307 | { |
| 308 | *msklen = 64; |
| 309 | } |
| 310 | if (emsk) { |
| 311 | *emsk = malloc(64); |
| 312 | memcpy(*emsk, (*msk)+64, 64); |
| 313 | memset((*msk)+64, 0, 64); |
| 314 | *emsklen = 64; |
| 315 | } |
| 316 | |
| 317 | return 0; |
| 318 | } |
| 319 | |
| 320 | void eap_tls_unregister(void) |
| 321 | { |
| 322 | // |
| 323 | } |
| 324 | |
| 325 | void eap_tls_free(void * mdata) |
| 326 | { |
| 327 | struct tls_data *data; |
| 328 | data = (struct tls_data*) mdata; |
| 329 | gnutls_deinit(data->session); |
| 330 | if(data->tlsReq.data){ |
| 331 | free(data->tlsReq.data); |
| 332 | data->tlsReq.data=NULL; |
| 333 | } |
| 334 | if(data->tlsResp.data){ |
| 335 | free(data->tlsResp.data); |
| 336 | data->tlsResp.data=NULL; |
| 337 | } |
| 338 | free(data); |
| 339 | data=NULL; |
| 340 | } |
| 341 | |
| 342 | //send TLS ACK Request (empty TLS msg) |
| 343 | int diameap_eap_tls_buildReq_ack(u8 id, struct eap_packet * eapPacket) |
| 344 | { |
| 345 | u8* payload; |
| 346 | struct tls_msg tlsmsg; |
| 347 | int len; |
| 348 | CHECK_FCT(diameap_tls_new(&tlsmsg)); |
| 349 | CHECK_FCT(diameap_tls_new_tls_packet(&payload,&len,tlsmsg)); |
| 350 | CHECK_FCT(diameap_eap_new(EAP_REQUEST,id,TYPE_EAP_TLS,payload,len,eapPacket)); |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | // parse EAP TLS msg |
| 355 | int diameap_eap_tls_parse(struct tls_msg * tlsmsg, struct eap_packet *eapPacket) |
| 356 | { |
| 357 | u8 *datatls; |
| 358 | int len; |
| 359 | |
| 360 | //initialize a new empty EAP TLS msg |
| 361 | diameap_tls_new(tlsmsg); |
| 362 | //retrieve the data field from EAP Packet |
| 363 | diameap_eap_get_data(eapPacket, &datatls, &len); |
| 364 | //parse EAP TLS msg |
| 365 | diameap_tls_parse(datatls, len, tlsmsg); |
| 366 | return 0; |
| 367 | } |
| 368 | |
| 369 | int diameap_eap_tls_buildReq_start(u8 id, struct eap_packet * eapPacket) |
| 370 | { |
| 371 | u8* payload; |
| 372 | struct tls_msg tlsmsg; |
| 373 | int len; |
| 374 | CHECK_FCT(diameap_tls_new(&tlsmsg)); |
| 375 | CHECK_FCT(diameap_tls_set_flags(&tlsmsg,TLS_FLAG_START)); |
| 376 | CHECK_FCT(diameap_tls_new_tls_packet(&payload,&len,tlsmsg)); |
| 377 | CHECK_FCT(diameap_eap_new(EAP_REQUEST,id,TYPE_EAP_TLS,payload,len,eapPacket)); |
| 378 | return 0; |
| 379 | } |
| 380 | |
| 381 | int diameap_eap_tls_buildReq_data(struct tls_data * data, int id, |
| 382 | struct eap_packet * eapPacket) |
| 383 | { |
| 384 | struct tls_msg tlsmsg; |
| 385 | u8* datatosend; |
| 386 | u8 * eaptls_data; |
| 387 | int length = 0; |
| 388 | |
| 389 | diameap_tls_new(&tlsmsg); |
| 390 | |
| 391 | if (data->more_tosend_length == 0) |
| 392 | { |
| 393 | //First fragment of message or the only fragment of message |
| 394 | data->more_tosend_length = data->tlsReq.datalength; |
| 395 | } |
| 396 | if (data->more_tosend_length > tls_global_conf.max_size) |
| 397 | { |
| 398 | //New fragment of message. Is not the last fragment. |
| 399 | length = tls_global_conf.max_size; |
| 400 | CHECK_FCT(diameap_tls_set_flags(&tlsmsg,TLS_FLAG_MORE)); |
| 401 | if (data->more_tosend_length == data->tlsReq.datalength) |
| 402 | { |
| 403 | //The first fragment of message |
| 404 | CHECK_FCT(diameap_tls_set_message_length(&tlsmsg,data->tlsReq.datalength));//set L flag and length value |
| 405 | } |
| 406 | } |
| 407 | else |
| 408 | { |
| 409 | //The last fragment or the only fragment. |
| 410 | length = data->more_tosend_length; |
| 411 | } |
| 412 | |
| 413 | datatosend = malloc(sizeof(u8) * length); |
| 414 | U8COPY(datatosend,0,length,data->tlsReq.data+(data->tlsReq.datalength-data->more_tosend_length)); |
| 415 | data->more_tosend_length -= length; |
| 416 | CHECK_FCT(diameap_tls_set_data(&tlsmsg,datatosend,length)); |
| 417 | |
| 418 | CHECK_FCT(diameap_tls_new_tls_packet(&eaptls_data,&length,tlsmsg)); |
| 419 | CHECK_FCT(diameap_eap_new(EAP_REQUEST,id,TYPE_EAP_TLS,eaptls_data,length,eapPacket)); |
| 420 | |
| 421 | if (data->more_tosend_length == 0) |
| 422 | { |
| 423 | diameap_tls_new(&data->tlsReq); |
| 424 | } |
| 425 | return 0; |
| 426 | } |