src/main/tls.c

   1 /*
   2  * tls.c
   3  *
   4  * Version:     $Id$
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * Copyright 2001  hereUare Communications, Inc. <raghud@hereuare.com>
  21  * Copyright 2003  Alan DeKok <aland@freeradius.org>
  22  * Copyright 2006  The FreeRADIUS server project
  23  */
  24
  25 #include <freeradius-devel/ident.h>
  26 RCSID("$Id$")
  27
  28 #include <freeradius-devel/autoconf.h>
  29 #include <freeradius-devel/radiusd.h>
  30 #include <freeradius-devel/process.h>
  31 #include <freeradius-devel/rad_assert.h>
  32
  33 #ifdef HAVE_SYS_STAT_H
  34 #include <sys/stat.h>
  35 #endif
  36
  37 #ifdef WITH_TLS
  38 #ifdef HAVE_OPENSSL_RAND_H
  39 #include <openssl/rand.h>
  40 #endif
  41
  42 #ifdef HAVE_OPENSSL_OCSP_H
  43 #include <openssl/ocsp.h>
  44 #endif
  45
  46 #ifdef HAVE_PTHREAD_H
  47 #define PTHREAD_MUTEX_LOCK pthread_mutex_lock
  48 #define PTHREAD_MUTEX_UNLOCK pthread_mutex_unlock
  49 #else
  50 #define PTHREAD_MUTEX_LOCK(_x)
  51 #define PTHREAD_MUTEX_UNLOCK(_x)
  52 #endif
  53
  54
  55 /* record */
  56 static void             record_init(record_t *buf);
  57 static void             record_close(record_t *buf);
  58 static unsigned int     record_plus(record_t *buf, const void *ptr,
  59                                     unsigned int size);
  60 static unsigned int     record_minus(record_t *buf, void *ptr,
  61                                      unsigned int size);
  62
  63 #ifdef PSK_MAX_IDENTITY_LEN
  64 static unsigned int psk_server_callback(SSL *ssl, const char *identity,
  65                                         unsigned char *psk, int max_psk_len)
  66 {
  67         unsigned int psk_len;
  68         fr_tls_server_conf_t *conf;
  69
  70         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl,
  71                                                        FR_TLS_EX_INDEX_CONF);
  72         if (!conf) return 0;
  73
  74         /*
  75          *      FIXME: Look up the PSK password based on the identity!
  76          */
  77         if (strcmp(identity, conf->psk_identity) != 0) {
  78                 return 0;
  79         }
  80
  81         psk_len = strlen(conf->psk_password);
  82         if (psk_len > (2 * max_psk_len)) return 0;
  83
  84         return fr_hex2bin(conf->psk_password, psk, psk_len);
  85 }
  86
  87 static unsigned int psk_client_callback(SSL *ssl, UNUSED const char *hint,
  88                                         char *identity, unsigned int max_identity_len,
  89                                         unsigned char *psk, unsigned int max_psk_len)
  90 {
  91         unsigned int psk_len;
  92         fr_tls_server_conf_t *conf;
  93
  94         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl,
  95                                                        FR_TLS_EX_INDEX_CONF);
  96         if (!conf) return 0;
  97
  98         psk_len = strlen(conf->psk_password);
  99         if (psk_len > (2 * max_psk_len)) return 0;
 100
 101         strlcpy(identity, conf->psk_identity, max_identity_len);
 102
 103         return fr_hex2bin(conf->psk_password, psk, psk_len);
 104 }
 105
 106 #endif
 107
 108 tls_session_t *tls_new_client_session(fr_tls_server_conf_t *conf, int fd)
 109 {
 110         int verify_mode;
 111         tls_session_t *ssn = NULL;
 112
 113         ssn = (tls_session_t *) malloc(sizeof(*ssn));
 114         memset(ssn, 0, sizeof(*ssn));
 115
 116         ssn->ctx = conf->ctx;
 117         ssn->ssl = SSL_new(ssn->ctx);
 118         rad_assert(ssn->ssl != NULL);
 119
 120         /*
 121          *      Add the message callback to identify what type of
 122          *      message/handshake is passed
 123          */
 124         SSL_set_msg_callback(ssn->ssl, cbtls_msg);
 125         SSL_set_msg_callback_arg(ssn->ssl, ssn);
 126         SSL_set_info_callback(ssn->ssl, cbtls_info);
 127
 128         /*
 129          *      Always verify the peer certificate.
 130          */
 131         DEBUG2("Requiring Server certificate");
 132         verify_mode = SSL_VERIFY_PEER;
 133         verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
 134         SSL_set_verify(ssn->ssl, verify_mode, cbtls_verify);
 135
 136         SSL_set_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CONF, (void *)conf);
 137         SSL_set_fd(ssn->ssl, fd);
 138         if (SSL_connect(ssn->ssl) <= 0) {
 139                 int err;
 140                 while ((err = ERR_get_error())) {
 141                         DEBUG("OpenSSL Err says %s",
 142                               ERR_error_string(err, NULL));
 143                 }
 144                 free(ssn);
 145                 return NULL;
 146         }
 147
 148         return ssn;
 149 }
 150
 151 tls_session_t *tls_new_session(fr_tls_server_conf_t *conf, REQUEST *request,
 152                                int client_cert)
 153 {
 154         tls_session_t *state = NULL;
 155         SSL *new_tls = NULL;
 156         int             verify_mode = 0;
 157         VALUE_PAIR      *vp;
 158
 159         /*
 160          *      Manually flush the sessions every so often.  If HALF
 161          *      of the session lifetime has passed since we last
 162          *      flushed, then flush it again.
 163          *
 164          *      FIXME: Also do it every N sessions?
 165          */
 166         if (conf->session_cache_enable &&
 167             ((conf->session_last_flushed + (conf->session_timeout * 1800)) <= request->timestamp)){
 168                 RDEBUG2("Flushing SSL sessions (of #%ld)",
 169                         SSL_CTX_sess_number(conf->ctx));
 170
 171                 SSL_CTX_flush_sessions(conf->ctx, request->timestamp);
 172                 conf->session_last_flushed = request->timestamp;
 173         }
 174
 175         if ((new_tls = SSL_new(conf->ctx)) == NULL) {
 176                 radlog(L_ERR, "SSL: Error creating new SSL: %s",
 177                        ERR_error_string(ERR_get_error(), NULL));
 178                 return NULL;
 179         }
 180
 181         /* We use the SSL's "app_data" to indicate a call-back */
 182         SSL_set_app_data(new_tls, NULL);
 183
 184         state = (tls_session_t *)malloc(sizeof(*state));
 185         memset(state, 0, sizeof(*state));
 186         session_init(state);
 187
 188         state->ctx = conf->ctx;
 189         state->ssl = new_tls;
 190
 191         /*
 192          *      Initialize callbacks
 193          */
 194         state->record_init = record_init;
 195         state->record_close = record_close;
 196         state->record_plus = record_plus;
 197         state->record_minus = record_minus;
 198
 199         /*
 200          *      Create & hook the BIOs to handle the dirty side of the
 201          *      SSL.  This is *very important* as we want to handle
 202          *      the transmission part.  Now the only IO interface
 203          *      that SSL is aware of, is our defined BIO buffers.
 204          *
 205          *      This means that all SSL IO is done to/from memory,
 206          *      and we can update those BIOs from the packets we've
 207          *      received.
 208          */
 209         state->into_ssl = BIO_new(BIO_s_mem());
 210         state->from_ssl = BIO_new(BIO_s_mem());
 211         SSL_set_bio(state->ssl, state->into_ssl, state->from_ssl);
 212
 213         /*
 214          *      Add the message callback to identify what type of
 215          *      message/handshake is passed
 216          */
 217         SSL_set_msg_callback(new_tls, cbtls_msg);
 218         SSL_set_msg_callback_arg(new_tls, state);
 219         SSL_set_info_callback(new_tls, cbtls_info);
 220
 221         /*
 222          *      In Server mode we only accept.
 223          */
 224         SSL_set_accept_state(state->ssl);
 225
 226         /*
 227          *      Verify the peer certificate, if asked.
 228          */
 229         if (client_cert) {
 230                 RDEBUG2("Requiring client certificate");
 231                 verify_mode = SSL_VERIFY_PEER;
 232                 verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
 233                 verify_mode |= SSL_VERIFY_CLIENT_ONCE;
 234         }
 235         SSL_set_verify(state->ssl, verify_mode, cbtls_verify);
 236
 237         SSL_set_ex_data(state->ssl, FR_TLS_EX_INDEX_CONF, (void *)conf);
 238         state->length_flag = conf->include_length;
 239
 240         /*
 241          *      We use default fragment size, unless the Framed-MTU
 242          *      tells us it's too big.  Note that we do NOT account
 243          *      for the EAP-TLS headers if conf->fragment_size is
 244          *      large, because that config item looks to be confusing.
 245          *
 246          *      i.e. it should REALLY be called MTU, and the code here
 247          *      should figure out what that means for TLS fragment size.
 248          *      asking the administrator to know the internal details
 249          *      of EAP-TLS in order to calculate fragment sizes is
 250          *      just too much.
 251          */
 252         state->offset = conf->fragment_size;
 253         vp = pairfind(request->packet->vps, PW_FRAMED_MTU, 0);
 254         if (vp && (vp->vp_integer > 100) && (vp->vp_integer < state->offset)) {
 255                 state->offset = vp->vp_integer;
 256         }
 257
 258         if (conf->session_cache_enable) {
 259                 state->allow_session_resumption = 1; /* otherwise it's zero */
 260         }
 261
 262         RDEBUG2("Initiate");
 263
 264         return state;
 265 }
 266
 267 /*
 268  *      Print out some text describing the error.
 269  */
 270 static int int_ssl_check(REQUEST *request, SSL *s, int ret, const char *text)
 271 {
 272         int e;
 273         unsigned long l;
 274
 275         if ((l = ERR_get_error()) != 0) {
 276                 const char *p = ERR_error_string(l, NULL);
 277                 VALUE_PAIR *vp;
 278
 279                 radlog(L_ERR, "SSL error %s", p);
 280
 281                 if (request) {
 282                         vp = pairmake("Module-Failure-Message", p, T_OP_ADD);
 283                         if (vp) pairadd(&request->packet->vps, vp);
 284                 }
 285         }
 286         e = SSL_get_error(s, ret);
 287
 288         switch(e) {
 289                 /*
 290                  *      These seem to be harmless and already "dealt
 291                  *      with" by our non-blocking environment. NB:
 292                  *      "ZERO_RETURN" is the clean "error"
 293                  *      indicating a successfully closed SSL
 294                  *      tunnel. We let this happen because our IO
 295                  *      loop should not appear to have broken on
 296                  *      this condition - and outside the IO loop, the
 297                  *      "shutdown" state is checked.
 298                  *
 299                  *      Don't print anything if we ignore the error.
 300                  */
 301         case SSL_ERROR_NONE:
 302         case SSL_ERROR_WANT_READ:
 303         case SSL_ERROR_WANT_WRITE:
 304         case SSL_ERROR_WANT_X509_LOOKUP:
 305         case SSL_ERROR_ZERO_RETURN:
 306                 break;
 307
 308                 /*
 309                  *      These seem to be indications of a genuine
 310                  *      error that should result in the SSL tunnel
 311                  *      being regarded as "dead".
 312                  */
 313         case SSL_ERROR_SYSCALL:
 314                 radlog(L_ERR, "SSL: %s failed in a system call (%d), TLS session fails.",
 315                        text, ret);
 316                 return 0;
 317
 318         case SSL_ERROR_SSL:
 319                 radlog(L_ERR, "SSL: %s failed inside of TLS (%d), TLS session fails.",
 320                        text, ret);
 321                 return 0;
 322
 323         default:
 324                 /*
 325                  *      For any other errors that (a) exist, and (b)
 326                  *      crop up - we need to interpret what to do with
 327                  *      them - so "politely inform" the caller that
 328                  *      the code needs updating here.
 329                  */
 330                 radlog(L_ERR, "SSL: FATAL SSL error ..... %d\n", e);
 331                 return 0;
 332         }
 333
 334         return 1;
 335 }
 336
 337 /*
 338  * We are the server, we always get the dirty data
 339  * (Handshake data is also considered as dirty data)
 340  * During handshake, since SSL API handles itself,
 341  * After clean-up, dirty_out will be filled with
 342  * the data required for handshaking. So we check
 343  * if dirty_out is empty then we simply send it back.
 344  * As of now, if handshake is successful, then we keep going,
 345  * otherwise we fail.
 346  *
 347  * Fill the Bio with the dirty data to clean it
 348  * Get the cleaned data from SSL, if it is not Handshake data
 349  */
 350 int tls_handshake_recv(REQUEST *request, tls_session_t *ssn)
 351 {
 352         int err;
 353
 354         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data, ssn->dirty_in.used);
 355         if (err != (int) ssn->dirty_in.used) {
 356                 RDEBUG("Failed writing %d to SSL BIO: %d", ssn->dirty_in.used,
 357                         err);
 358                 record_init(&ssn->dirty_in);
 359                 return 0;
 360         }
 361         record_init(&ssn->dirty_in);
 362
 363         err = SSL_read(ssn->ssl, ssn->clean_out.data + ssn->clean_out.used,
 364                        sizeof(ssn->clean_out.data) - ssn->clean_out.used);
 365         if (err > 0) {
 366                 ssn->clean_out.used += err;
 367                 return 1;
 368         }
 369
 370         if (!int_ssl_check(request, ssn->ssl, err, "SSL_read")) {
 371                 return 0;
 372         }
 373
 374         /* Some Extra STATE information for easy debugging */
 375         if (SSL_is_init_finished(ssn->ssl)) {
 376                 DEBUG2("SSL Connection Established\n");
 377         }
 378         if (SSL_in_init(ssn->ssl)) {
 379                 DEBUG2("In SSL Handshake Phase\n");
 380         }
 381         if (SSL_in_before(ssn->ssl)) {
 382                 DEBUG2("Before SSL Handshake Phase\n");
 383         }
 384         if (SSL_in_accept_init(ssn->ssl)) {
 385                 DEBUG2("In SSL Accept mode \n");
 386         }
 387         if (SSL_in_connect_init(ssn->ssl)) {
 388                 DEBUG2("In SSL Connect mode \n");
 389         }
 390
 391         err = BIO_ctrl_pending(ssn->from_ssl);
 392         if (err > 0) {
 393                 err = BIO_read(ssn->from_ssl, ssn->dirty_out.data,
 394                                sizeof(ssn->dirty_out.data));
 395                 if (err > 0) {
 396                         ssn->dirty_out.used = err;
 397
 398                 } else if (BIO_should_retry(ssn->from_ssl)) {
 399                         record_init(&ssn->dirty_in);
 400                         DEBUG2("  tls: Asking for more data in tunnel");
 401                         return 1;
 402
 403                 } else {
 404                         int_ssl_check(request, ssn->ssl, err, "BIO_read");
 405                         record_init(&ssn->dirty_in);
 406                         return 0;
 407                 }
 408         } else {
 409                 DEBUG2("SSL Application Data");
 410                 /* Its clean application data, do whatever we want */
 411                 record_init(&ssn->clean_out);
 412         }
 413
 414         /* We are done with dirty_in, reinitialize it */
 415         record_init(&ssn->dirty_in);
 416         return 1;
 417 }
 418
 419 /*
 420  *      Take clear-text user data, and encrypt it into the output buffer,
 421  *      to send to the client at the other end of the SSL connection.
 422  */
 423 int tls_handshake_send(REQUEST *request, tls_session_t *ssn)
 424 {
 425         int err;
 426
 427         /*
 428          *      If there's un-encrypted data in 'clean_in', then write
 429          *      that data to the SSL session, and then call the BIO function
 430          *      to get that encrypted data from the SSL session, into
 431          *      a buffer which we can then package into an EAP packet.
 432          *
 433          *      Based on Server's logic this clean_in is expected to
 434          *      contain the data to send to the client.
 435          */
 436         if (ssn->clean_in.used > 0) {
 437                 int written;
 438
 439                 written = SSL_write(ssn->ssl, ssn->clean_in.data, ssn->clean_in.used);
 440                 record_minus(&ssn->clean_in, NULL, written);
 441
 442                 /* Get the dirty data from Bio to send it */
 443                 err = BIO_read(ssn->from_ssl, ssn->dirty_out.data,
 444                                sizeof(ssn->dirty_out.data));
 445                 if (err > 0) {
 446                         ssn->dirty_out.used = err;
 447                 } else {
 448                         int_ssl_check(request, ssn->ssl, err, "handshake_send");
 449                 }
 450         }
 451
 452         return 1;
 453 }
 454
 455 void session_init(tls_session_t *ssn)
 456 {
 457         ssn->ssl = NULL;
 458         ssn->into_ssl = ssn->from_ssl = NULL;
 459         record_init(&ssn->clean_in);
 460         record_init(&ssn->clean_out);
 461         record_init(&ssn->dirty_in);
 462         record_init(&ssn->dirty_out);
 463
 464         memset(&ssn->info, 0, sizeof(ssn->info));
 465
 466         ssn->offset = 0;
 467         ssn->fragment = 0;
 468         ssn->tls_msg_len = 0;
 469         ssn->length_flag = 0;
 470         ssn->opaque = NULL;
 471         ssn->free_opaque = NULL;
 472 }
 473
 474 void session_close(tls_session_t *ssn)
 475 {
 476         SSL_set_quiet_shutdown(ssn->ssl, 1);
 477         SSL_shutdown(ssn->ssl);
 478
 479         if(ssn->ssl)
 480                 SSL_free(ssn->ssl);
 481
 482         record_close(&ssn->clean_in);
 483         record_close(&ssn->clean_out);
 484         record_close(&ssn->dirty_in);
 485         record_close(&ssn->dirty_out);
 486         session_init(ssn);
 487 }
 488
 489 void session_free(void *ssn)
 490 {
 491         tls_session_t *sess = (tls_session_t *)ssn;
 492
 493         if (!ssn) return;
 494
 495         /*
 496          *      Free any opaque TTLS or PEAP data.
 497          */
 498         if ((sess->opaque) && (sess->free_opaque)) {
 499                 sess->free_opaque(sess->opaque);
 500                 sess->opaque = NULL;
 501         }
 502
 503         session_close(sess);
 504
 505         free(sess);
 506 }
 507
 508 static void record_init(record_t *rec)
 509 {
 510         rec->used = 0;
 511 }
 512
 513 static void record_close(record_t *rec)
 514 {
 515         rec->used = 0;
 516 }
 517
 518
 519 /*
 520  *      Copy data to the intermediate buffer, before we send
 521  *      it somewhere.
 522  */
 523 static unsigned int record_plus(record_t *rec, const void *ptr,
 524                                 unsigned int size)
 525 {
 526         unsigned int added = MAX_RECORD_SIZE - rec->used;
 527
 528         if(added > size)
 529                 added = size;
 530         if(added == 0)
 531                 return 0;
 532         memcpy(rec->data + rec->used, ptr, added);
 533         rec->used += added;
 534         return added;
 535 }
 536
 537 /*
 538  *      Take data from the buffer, and give it to the caller.
 539  */
 540 static unsigned int record_minus(record_t *rec, void *ptr,
 541                                  unsigned int size)
 542 {
 543         unsigned int taken = rec->used;
 544
 545         if(taken > size)
 546                 taken = size;
 547         if(taken == 0)
 548                 return 0;
 549         if(ptr)
 550                 memcpy(ptr, rec->data, taken);
 551         rec->used -= taken;
 552
 553         /*
 554          *      This is pretty bad...
 555          */
 556         if(rec->used > 0)
 557                 memmove(rec->data, rec->data + taken, rec->used);
 558         return taken;
 559 }
 560
 561 void tls_session_information(tls_session_t *tls_session)
 562 {
 563         const char *str_write_p, *str_version, *str_content_type = "";
 564         const char *str_details1 = "", *str_details2= "";
 565         REQUEST *request;
 566
 567         /*
 568          *      Don't print this out in the normal course of
 569          *      operations.
 570          */
 571         if (debug_flag == 0) {
 572                 return;
 573         }
 574
 575         str_write_p = tls_session->info.origin ? ">>>" : "<<<";
 576
 577         switch (tls_session->info.version)
 578         {
 579         case SSL2_VERSION:
 580                 str_version = "SSL 2.0";
 581                 break;
 582         case SSL3_VERSION:
 583                 str_version = "SSL 3.0 ";
 584                 break;
 585         case TLS1_VERSION:
 586                 str_version = "TLS 1.0 ";
 587                 break;
 588         default:
 589                 str_version = "Unknown TLS version";
 590                 break;
 591         }
 592
 593         if (tls_session->info.version == SSL3_VERSION ||
 594             tls_session->info.version == TLS1_VERSION) {
 595                 switch (tls_session->info.content_type) {
 596                 case SSL3_RT_CHANGE_CIPHER_SPEC:
 597                         str_content_type = "ChangeCipherSpec";
 598                         break;
 599                 case SSL3_RT_ALERT:
 600                         str_content_type = "Alert";
 601                         break;
 602                 case SSL3_RT_HANDSHAKE:
 603                         str_content_type = "Handshake";
 604                         break;
 605                 case SSL3_RT_APPLICATION_DATA:
 606                         str_content_type = "ApplicationData";
 607                         break;
 608                 default:
 609                         str_content_type = "UnknownContentType";
 610                         break;
 611                 }
 612
 613                 if (tls_session->info.content_type == SSL3_RT_ALERT) {
 614                         str_details1 = ", ???";
 615
 616                         if (tls_session->info.record_len == 2) {
 617
 618                                 switch (tls_session->info.alert_level) {
 619                                 case SSL3_AL_WARNING:
 620                                         str_details1 = ", warning";
 621                                         break;
 622                                 case SSL3_AL_FATAL:
 623                                         str_details1 = ", fatal";
 624                                         break;
 625                                 }
 626
 627                                 str_details2 = " ???";
 628                                 switch (tls_session->info.alert_description) {
 629                                 case SSL3_AD_CLOSE_NOTIFY:
 630                                         str_details2 = " close_notify";
 631                                         break;
 632                                 case SSL3_AD_UNEXPECTED_MESSAGE:
 633                                         str_details2 = " unexpected_message";
 634                                         break;
 635                                 case SSL3_AD_BAD_RECORD_MAC:
 636                                         str_details2 = " bad_record_mac";
 637                                         break;
 638                                 case TLS1_AD_DECRYPTION_FAILED:
 639                                         str_details2 = " decryption_failed";
 640                                         break;
 641                                 case TLS1_AD_RECORD_OVERFLOW:
 642                                         str_details2 = " record_overflow";
 643                                         break;
 644                                 case SSL3_AD_DECOMPRESSION_FAILURE:
 645                                         str_details2 = " decompression_failure";
 646                                         break;
 647                                 case SSL3_AD_HANDSHAKE_FAILURE:
 648                                         str_details2 = " handshake_failure";
 649                                         break;
 650                                 case SSL3_AD_BAD_CERTIFICATE:
 651                                         str_details2 = " bad_certificate";
 652                                         break;
 653                                 case SSL3_AD_UNSUPPORTED_CERTIFICATE:
 654                                         str_details2 = " unsupported_certificate";
 655                                         break;
 656                                 case SSL3_AD_CERTIFICATE_REVOKED:
 657                                         str_details2 = " certificate_revoked";
 658                                         break;
 659                                 case SSL3_AD_CERTIFICATE_EXPIRED:
 660                                         str_details2 = " certificate_expired";
 661                                         break;
 662                                 case SSL3_AD_CERTIFICATE_UNKNOWN:
 663                                         str_details2 = " certificate_unknown";
 664                                         break;
 665                                 case SSL3_AD_ILLEGAL_PARAMETER:
 666                                         str_details2 = " illegal_parameter";
 667                                         break;
 668                                 case TLS1_AD_UNKNOWN_CA:
 669                                         str_details2 = " unknown_ca";
 670                                         break;
 671                                 case TLS1_AD_ACCESS_DENIED:
 672                                         str_details2 = " access_denied";
 673                                         break;
 674                                 case TLS1_AD_DECODE_ERROR:
 675                                         str_details2 = " decode_error";
 676                                         break;
 677                                 case TLS1_AD_DECRYPT_ERROR:
 678                                         str_details2 = " decrypt_error";
 679                                         break;
 680                                 case TLS1_AD_EXPORT_RESTRICTION:
 681                                         str_details2 = " export_restriction";
 682                                         break;
 683                                 case TLS1_AD_PROTOCOL_VERSION:
 684                                         str_details2 = " protocol_version";
 685                                         break;
 686                                 case TLS1_AD_INSUFFICIENT_SECURITY:
 687                                         str_details2 = " insufficient_security";
 688                                         break;
 689                                 case TLS1_AD_INTERNAL_ERROR:
 690                                         str_details2 = " internal_error";
 691                                         break;
 692                                 case TLS1_AD_USER_CANCELLED:
 693                                         str_details2 = " user_canceled";
 694                                         break;
 695                                 case TLS1_AD_NO_RENEGOTIATION:
 696                                         str_details2 = " no_renegotiation";
 697                                         break;
 698                                 }
 699                         }
 700                 }
 701
 702                 if (tls_session->info.content_type == SSL3_RT_HANDSHAKE) {
 703                         str_details1 = "???";
 704
 705                         if (tls_session->info.record_len > 0)
 706                         switch (tls_session->info.handshake_type)
 707                         {
 708                         case SSL3_MT_HELLO_REQUEST:
 709                                 str_details1 = ", HelloRequest";
 710                                 break;
 711                         case SSL3_MT_CLIENT_HELLO:
 712                                 str_details1 = ", ClientHello";
 713                                 break;
 714                         case SSL3_MT_SERVER_HELLO:
 715                                 str_details1 = ", ServerHello";
 716                                 break;
 717                         case SSL3_MT_CERTIFICATE:
 718                                 str_details1 = ", Certificate";
 719                                 break;
 720                         case SSL3_MT_SERVER_KEY_EXCHANGE:
 721                                 str_details1 = ", ServerKeyExchange";
 722                                 break;
 723                         case SSL3_MT_CERTIFICATE_REQUEST:
 724                                 str_details1 = ", CertificateRequest";
 725                                 break;
 726                         case SSL3_MT_SERVER_DONE:
 727                                 str_details1 = ", ServerHelloDone";
 728                                 break;
 729                         case SSL3_MT_CERTIFICATE_VERIFY:
 730                                 str_details1 = ", CertificateVerify";
 731                                 break;
 732                         case SSL3_MT_CLIENT_KEY_EXCHANGE:
 733                                 str_details1 = ", ClientKeyExchange";
 734                                 break;
 735                         case SSL3_MT_FINISHED:
 736                                 str_details1 = ", Finished";
 737                                 break;
 738                         }
 739                 }
 740         }
 741
 742         snprintf(tls_session->info.info_description,
 743                  sizeof(tls_session->info.info_description),
 744                  "%s %s%s [length %04lx]%s%s\n",
 745                  str_write_p, str_version, str_content_type,
 746                  (unsigned long)tls_session->info.record_len,
 747                  str_details1, str_details2);
 748
 749         request = SSL_get_ex_data(tls_session->ssl, FR_TLS_EX_INDEX_REQUEST);
 750
 751         RDEBUG2("%s\n", tls_session->info.info_description);
 752 }
 753
 754 static CONF_PARSER cache_config[] = {
 755         { "enable", PW_TYPE_BOOLEAN,
 756           offsetof(fr_tls_server_conf_t, session_cache_enable), NULL, "no" },
 757         { "lifetime", PW_TYPE_INTEGER,
 758           offsetof(fr_tls_server_conf_t, session_timeout), NULL, "24" },
 759         { "max_entries", PW_TYPE_INTEGER,
 760           offsetof(fr_tls_server_conf_t, session_cache_size), NULL, "255" },
 761         { "name", PW_TYPE_STRING_PTR,
 762           offsetof(fr_tls_server_conf_t, session_id_name), NULL, NULL},
 763         { NULL, -1, 0, NULL, NULL }           /* end the list */
 764 };
 765
 766 static CONF_PARSER verify_config[] = {
 767         { "tmpdir", PW_TYPE_STRING_PTR,
 768           offsetof(fr_tls_server_conf_t, verify_tmp_dir), NULL, NULL},
 769         { "client", PW_TYPE_STRING_PTR,
 770           offsetof(fr_tls_server_conf_t, verify_client_cert_cmd), NULL, NULL},
 771         { NULL, -1, 0, NULL, NULL }           /* end the list */
 772 };
 773
 774 #ifdef HAVE_OPENSSL_OCSP_H
 775 static CONF_PARSER ocsp_config[] = {
 776         { "enable", PW_TYPE_BOOLEAN,
 777           offsetof(fr_tls_server_conf_t, ocsp_enable), NULL, "no"},
 778         { "override_cert_url", PW_TYPE_BOOLEAN,
 779           offsetof(fr_tls_server_conf_t, ocsp_override_url), NULL, "no"},
 780         { "url", PW_TYPE_STRING_PTR,
 781           offsetof(fr_tls_server_conf_t, ocsp_url), NULL, NULL },
 782         { NULL, -1, 0, NULL, NULL }           /* end the list */
 783 };
 784 #endif
 785
 786 static CONF_PARSER tls_server_config[] = {
 787         { "rsa_key_exchange", PW_TYPE_BOOLEAN,
 788           offsetof(fr_tls_server_conf_t, rsa_key), NULL, "no" },
 789         { "dh_key_exchange", PW_TYPE_BOOLEAN,
 790           offsetof(fr_tls_server_conf_t, dh_key), NULL, "yes" },
 791         { "rsa_key_length", PW_TYPE_INTEGER,
 792           offsetof(fr_tls_server_conf_t, rsa_key_length), NULL, "512" },
 793         { "dh_key_length", PW_TYPE_INTEGER,
 794           offsetof(fr_tls_server_conf_t, dh_key_length), NULL, "512" },
 795         { "verify_depth", PW_TYPE_INTEGER,
 796           offsetof(fr_tls_server_conf_t, verify_depth), NULL, "0" },
 797         { "CA_path", PW_TYPE_FILENAME,
 798           offsetof(fr_tls_server_conf_t, ca_path), NULL, NULL },
 799         { "pem_file_type", PW_TYPE_BOOLEAN,
 800           offsetof(fr_tls_server_conf_t, file_type), NULL, "yes" },
 801         { "private_key_file", PW_TYPE_FILENAME,
 802           offsetof(fr_tls_server_conf_t, private_key_file), NULL, NULL },
 803         { "certificate_file", PW_TYPE_FILENAME,
 804           offsetof(fr_tls_server_conf_t, certificate_file), NULL, NULL },
 805         { "CA_file", PW_TYPE_FILENAME,
 806           offsetof(fr_tls_server_conf_t, ca_file), NULL, NULL },
 807         { "private_key_password", PW_TYPE_STRING_PTR,
 808           offsetof(fr_tls_server_conf_t, private_key_password), NULL, NULL },
 809 #ifdef PSK_MAX_IDENTITY_LEN
 810         { "psk_identity", PW_TYPE_STRING_PTR,
 811           offsetof(fr_tls_server_conf_t, psk_identity), NULL, NULL },
 812         { "psk_hexphrase", PW_TYPE_STRING_PTR,
 813           offsetof(fr_tls_server_conf_t, psk_password), NULL, NULL },
 814 #endif
 815         { "dh_file", PW_TYPE_STRING_PTR,
 816           offsetof(fr_tls_server_conf_t, dh_file), NULL, NULL },
 817         { "random_file", PW_TYPE_STRING_PTR,
 818           offsetof(fr_tls_server_conf_t, random_file), NULL, NULL },
 819         { "fragment_size", PW_TYPE_INTEGER,
 820           offsetof(fr_tls_server_conf_t, fragment_size), NULL, "1024" },
 821         { "include_length", PW_TYPE_BOOLEAN,
 822           offsetof(fr_tls_server_conf_t, include_length), NULL, "yes" },
 823         { "check_crl", PW_TYPE_BOOLEAN,
 824           offsetof(fr_tls_server_conf_t, check_crl), NULL, "no"},
 825         { "allow_expired_crl", PW_TYPE_BOOLEAN,
 826           offsetof(fr_tls_server_conf_t, allow_expired_crl), NULL, NULL},
 827         { "check_cert_cn", PW_TYPE_STRING_PTR,
 828           offsetof(fr_tls_server_conf_t, check_cert_cn), NULL, NULL},
 829         { "cipher_list", PW_TYPE_STRING_PTR,
 830           offsetof(fr_tls_server_conf_t, cipher_list), NULL, NULL},
 831         { "check_cert_issuer", PW_TYPE_STRING_PTR,
 832           offsetof(fr_tls_server_conf_t, check_cert_issuer), NULL, NULL},
 833         { "make_cert_command", PW_TYPE_STRING_PTR,
 834           offsetof(fr_tls_server_conf_t, make_cert_command), NULL, NULL},
 835         { "require_client_cert", PW_TYPE_BOOLEAN,
 836           offsetof(fr_tls_server_conf_t, require_client_cert), NULL, NULL },
 837
 838 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
 839 #ifndef OPENSSL_NO_ECDH
 840         { "ecdh_curve", PW_TYPE_STRING_PTR,
 841           offsetof(fr_tls_server_conf_t, ecdh_curve), NULL, "prime256v1"},
 842 #endif
 843 #endif
 844
 845         { "cache", PW_TYPE_SUBSECTION, 0, NULL, (const void *) cache_config },
 846
 847         { "verify", PW_TYPE_SUBSECTION, 0, NULL, (const void *) verify_config },
 848
 849 #ifdef HAVE_OPENSSL_OCSP_H
 850         { "ocsp", PW_TYPE_SUBSECTION, 0, NULL, (const void *) ocsp_config },
 851 #endif
 852
 853         { NULL, -1, 0, NULL, NULL }           /* end the list */
 854 };
 855
 856
 857 static CONF_PARSER tls_client_config[] = {
 858         { "rsa_key_exchange", PW_TYPE_BOOLEAN,
 859           offsetof(fr_tls_server_conf_t, rsa_key), NULL, "no" },
 860         { "dh_key_exchange", PW_TYPE_BOOLEAN,
 861           offsetof(fr_tls_server_conf_t, dh_key), NULL, "yes" },
 862         { "rsa_key_length", PW_TYPE_INTEGER,
 863           offsetof(fr_tls_server_conf_t, rsa_key_length), NULL, "512" },
 864         { "dh_key_length", PW_TYPE_INTEGER,
 865           offsetof(fr_tls_server_conf_t, dh_key_length), NULL, "512" },
 866         { "verify_depth", PW_TYPE_INTEGER,
 867           offsetof(fr_tls_server_conf_t, verify_depth), NULL, "0" },
 868         { "CA_path", PW_TYPE_FILENAME,
 869           offsetof(fr_tls_server_conf_t, ca_path), NULL, NULL },
 870         { "pem_file_type", PW_TYPE_BOOLEAN,
 871           offsetof(fr_tls_server_conf_t, file_type), NULL, "yes" },
 872         { "private_key_file", PW_TYPE_FILENAME,
 873           offsetof(fr_tls_server_conf_t, private_key_file), NULL, NULL },
 874         { "certificate_file", PW_TYPE_FILENAME,
 875           offsetof(fr_tls_server_conf_t, certificate_file), NULL, NULL },
 876         { "CA_file", PW_TYPE_FILENAME,
 877           offsetof(fr_tls_server_conf_t, ca_file), NULL, NULL },
 878         { "private_key_password", PW_TYPE_STRING_PTR,
 879           offsetof(fr_tls_server_conf_t, private_key_password), NULL, NULL },
 880         { "dh_file", PW_TYPE_STRING_PTR,
 881           offsetof(fr_tls_server_conf_t, dh_file), NULL, NULL },
 882         { "random_file", PW_TYPE_STRING_PTR,
 883           offsetof(fr_tls_server_conf_t, random_file), NULL, NULL },
 884         { "fragment_size", PW_TYPE_INTEGER,
 885           offsetof(fr_tls_server_conf_t, fragment_size), NULL, "1024" },
 886         { "include_length", PW_TYPE_BOOLEAN,
 887           offsetof(fr_tls_server_conf_t, include_length), NULL, "yes" },
 888         { "check_crl", PW_TYPE_BOOLEAN,
 889           offsetof(fr_tls_server_conf_t, check_crl), NULL, "no"},
 890         { "check_cert_cn", PW_TYPE_STRING_PTR,
 891           offsetof(fr_tls_server_conf_t, check_cert_cn), NULL, NULL},
 892         { "cipher_list", PW_TYPE_STRING_PTR,
 893           offsetof(fr_tls_server_conf_t, cipher_list), NULL, NULL},
 894         { "check_cert_issuer", PW_TYPE_STRING_PTR,
 895           offsetof(fr_tls_server_conf_t, check_cert_issuer), NULL, NULL},
 896
 897 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
 898 #ifndef OPENSSL_NO_ECDH
 899         { "ecdh_curve", PW_TYPE_STRING_PTR,
 900           offsetof(fr_tls_server_conf_t, ecdh_curve), NULL, "prime256v1"},
 901 #endif
 902 #endif
 903
 904         { NULL, -1, 0, NULL, NULL }           /* end the list */
 905 };
 906
 907
 908 /*
 909  *      TODO: Check for the type of key exchange * like conf->dh_key
 910  */
 911 static int load_dh_params(SSL_CTX *ctx, char *file)
 912 {
 913         DH *dh = NULL;
 914         BIO *bio;
 915
 916         if ((bio = BIO_new_file(file, "r")) == NULL) {
 917                 radlog(L_ERR, "rlm_eap_tls: Unable to open DH file - %s", file);
 918                 return -1;
 919         }
 920
 921         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
 922         BIO_free(bio);
 923         if (!dh) {
 924                 DEBUG2("WARNING: rlm_eap_tls: Unable to set DH parameters.  DH cipher suites may not work!");
 925                 DEBUG2("WARNING: Fix this by running the OpenSSL command listed in eap.conf");
 926                 return 0;
 927         }
 928
 929         if (SSL_CTX_set_tmp_dh(ctx, dh) < 0) {
 930                 radlog(L_ERR, "rlm_eap_tls: Unable to set DH parameters");
 931                 DH_free(dh);
 932                 return -1;
 933         }
 934
 935         DH_free(dh);
 936         return 0;
 937 }
 938
 939
 940 /*
 941  *      Generate ephemeral RSA keys.
 942  */
 943 static int generate_eph_rsa_key(SSL_CTX *ctx)
 944 {
 945         RSA *rsa;
 946
 947         rsa = RSA_generate_key(512, RSA_F4, NULL, NULL);
 948
 949         if (!SSL_CTX_set_tmp_rsa(ctx, rsa)) {
 950                 radlog(L_ERR, "rlm_eap_tls: Couldn't set ephemeral RSA key");
 951                 return -1;
 952         }
 953
 954         RSA_free(rsa);
 955         return 0;
 956 }
 957
 958
 959 /*
 960  *      Print debugging messages, and free data.
 961  *
 962  *      FIXME: Write sessions to some long-term storage, so that
 963  *             session resumption can still occur after the server
 964  *             restarts.
 965  */
 966 #define MAX_SESSION_SIZE (256)
 967
 968 static void cbtls_remove_session(UNUSED SSL_CTX *ctx, SSL_SESSION *sess)
 969 {
 970         size_t size;
 971         char buffer[2 * MAX_SESSION_SIZE + 1];
 972
 973         size = sess->session_id_length;
 974         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
 975
 976         fr_bin2hex(sess->session_id, buffer, size);
 977
 978         DEBUG2("  SSL: Removing session %s from the cache", buffer);
 979
 980         return;
 981 }
 982
 983 static int cbtls_new_session(UNUSED SSL *s, SSL_SESSION *sess)
 984 {
 985         size_t size;
 986         char buffer[2 * MAX_SESSION_SIZE + 1];
 987
 988         size = sess->session_id_length;
 989         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
 990
 991         fr_bin2hex(sess->session_id, buffer, size);
 992
 993         DEBUG2("  SSL: adding session %s to cache", buffer);
 994
 995         return 0;
 996 }
 997
 998 static SSL_SESSION *cbtls_get_session(UNUSED SSL *s,
 999                                       unsigned char *data, int len,
1000                                       int *copy)
1001 {
1002         size_t size;
1003         char buffer[2 * MAX_SESSION_SIZE + 1];
1004
1005         size = len;
1006         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
1007
1008         fr_bin2hex(data, buffer, size);
1009
1010         DEBUG2("  SSL: Client requested nonexistent cached session %s",
1011                buffer);
1012
1013         *copy = 0;
1014         return NULL;
1015 }
1016
1017 #ifdef HAVE_OPENSSL_OCSP_H
1018 /*
1019  * This function extracts the OCSP Responder URL
1020  * from an existing x509 certificate.
1021  */
1022 static int ocsp_parse_cert_url(X509 *cert, char **phost, char **pport,
1023                                char **ppath, int *pssl)
1024 {
1025         int i;
1026
1027         AUTHORITY_INFO_ACCESS *aia;
1028         ACCESS_DESCRIPTION *ad;
1029
1030         aia = X509_get_ext_d2i(cert, NID_info_access, NULL, NULL);
1031
1032         for (i = 0; i < sk_ACCESS_DESCRIPTION_num(aia); i++) {
1033                 ad = sk_ACCESS_DESCRIPTION_value(aia, 0);
1034                 if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) {
1035                         if (ad->location->type == GEN_URI) {
1036                                 if(OCSP_parse_url(ad->location->d.ia5->data,
1037                                         phost, pport, ppath, pssl))
1038                                         return 1;
1039                         }
1040                 }
1041         }
1042         return 0;
1043 }
1044
1045 /*
1046  * This function sends a OCSP request to a defined OCSP responder
1047  * and checks the OCSP response for correctness.
1048  */
1049
1050 /* Maximum leeway in validity period: default 5 minutes */
1051 #define MAX_VALIDITY_PERIOD     (5 * 60)
1052
1053 static int ocsp_check(X509_STORE *store, X509 *issuer_cert, X509 *client_cert,
1054                       fr_tls_server_conf_t *conf)
1055 {
1056         OCSP_CERTID *certid;
1057         OCSP_REQUEST *req;
1058         OCSP_RESPONSE *resp;
1059         OCSP_BASICRESP *bresp = NULL;
1060         char *host = NULL;
1061         char *port = NULL;
1062         char *path = NULL;
1063         int use_ssl = -1;
1064         long nsec = MAX_VALIDITY_PERIOD, maxage = -1;
1065         BIO *cbio, *bio_out;
1066         int ocsp_ok = 0;
1067         int status ;
1068         ASN1_GENERALIZEDTIME *rev, *thisupd, *nextupd;
1069         int reason;
1070
1071         /*
1072          * Create OCSP Request
1073          */
1074         certid = OCSP_cert_to_id(NULL, client_cert, issuer_cert);
1075         req = OCSP_REQUEST_new();
1076         OCSP_request_add0_id(req, certid);
1077         OCSP_request_add1_nonce(req, NULL, 8);
1078
1079         /*
1080          * Send OCSP Request and get OCSP Response
1081          */
1082
1083         /* Get OCSP responder URL */
1084         if(conf->ocsp_override_url) {
1085                 OCSP_parse_url(conf->ocsp_url, &host, &port, &path, &use_ssl);
1086         }
1087         else {
1088                 ocsp_parse_cert_url(client_cert, &host, &port, &path, &use_ssl);
1089         }
1090
1091         DEBUG2("[ocsp] --> Responder URL = http://%s:%s%s", host, port, path);
1092
1093         /* Setup BIO socket to OCSP responder */
1094         cbio = BIO_new_connect(host);
1095
1096         bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
1097
1098         BIO_set_conn_port(cbio, port);
1099         BIO_do_connect(cbio);
1100
1101         /* Send OCSP request and wait for response */
1102         resp = OCSP_sendreq_bio(cbio, path, req);
1103         if(resp==0) {
1104                 radlog(L_ERR, "Error: Couldn't get OCSP response");
1105                 goto ocsp_end;
1106         }
1107
1108         /* Verify OCSP response status */
1109         status = OCSP_response_status(resp);
1110         DEBUG2("[ocsp] --> Response status: %s",OCSP_response_status_str(status));
1111         if(status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
1112                 radlog(L_ERR, "Error: OCSP response status: %s", OCSP_response_status_str(status));
1113                 goto ocsp_end;
1114         }
1115         bresp = OCSP_response_get1_basic(resp);
1116         if(OCSP_check_nonce(req, bresp)!=1) {
1117                 radlog(L_ERR, "Error: OCSP response has wrong nonce value");
1118                 goto ocsp_end;
1119         }
1120         if(OCSP_basic_verify(bresp, NULL, store, 0)!=1){
1121                 radlog(L_ERR, "Error: Couldn't verify OCSP basic response");
1122                 goto ocsp_end;
1123         }
1124
1125         /*      Verify OCSP cert status */
1126         if(!OCSP_resp_find_status(bresp, certid, &status, &reason,
1127                                                       &rev, &thisupd, &nextupd)) {
1128                 radlog(L_ERR, "ERROR: No Status found.\n");
1129                 goto ocsp_end;
1130         }
1131
1132         if (!OCSP_check_validity(thisupd, nextupd, nsec, maxage)) {
1133                 BIO_puts(bio_out, "WARNING: Status times invalid.\n");
1134                 ERR_print_errors(bio_out);
1135                 goto ocsp_end;
1136         }
1137         BIO_puts(bio_out, "\tThis Update: ");
1138         ASN1_GENERALIZEDTIME_print(bio_out, thisupd);
1139         BIO_puts(bio_out, "\n");
1140         BIO_puts(bio_out, "\tNext Update: ");
1141         ASN1_GENERALIZEDTIME_print(bio_out, nextupd);
1142         BIO_puts(bio_out, "\n");
1143
1144         switch (status) {
1145         case V_OCSP_CERTSTATUS_GOOD:
1146                 DEBUG2("[oscp] --> Cert status: good");
1147                 ocsp_ok = 1;
1148                 break;
1149
1150         default:
1151                 /* REVOKED / UNKNOWN */
1152                 DEBUG2("[ocsp] --> Cert status: %s",OCSP_cert_status_str(status));
1153                 if (reason != -1)
1154                         DEBUG2("[ocsp] --> Reason: %s", OCSP_crl_reason_str(reason));
1155                 BIO_puts(bio_out, "\tRevocation Time: ");
1156                 ASN1_GENERALIZEDTIME_print(bio_out, rev);
1157                 BIO_puts(bio_out, "\n");
1158                 break;
1159         }
1160
1161 ocsp_end:
1162         /* Free OCSP Stuff */
1163         OCSP_REQUEST_free(req);
1164         OCSP_RESPONSE_free(resp);
1165         free(host);
1166         free(port);
1167         free(path);
1168         BIO_free_all(cbio);
1169         OCSP_BASICRESP_free(bresp);
1170
1171         if (ocsp_ok) {
1172                 DEBUG2("[ocsp] --> Certificate is valid!");
1173         } else {
1174                 DEBUG2("[ocsp] --> Certificate has been expired/revoked!");
1175         }
1176
1177         return ocsp_ok;
1178 }
1179 #endif  /* HAVE_OPENSSL_OCSP_H */
1180
1181 /*
1182  *      For creating certificate attributes.
1183  */
1184 static const char *cert_attr_names[6][2] = {
1185   { "TLS-Client-Cert-Serial",           "TLS-Cert-Serial" },
1186   { "TLS-Client-Cert-Expiration",       "TLS-Cert-Expiration" },
1187   { "TLS-Client-Cert-Subject",          "TLS-Cert-Subject" },
1188   { "TLS-Client-Cert-Issuer",           "TLS-Cert-Issuer" },
1189   { "TLS-Client-Cert-Common-Name",      "TLS-Cert-Common-Name" },
1190   { "TLS-Client-Cert-Subject-Alt-Name-Email",   "TLS-Cert-Subject-Alt-Name-Email" }
1191 };
1192
1193 #define FR_TLS_SERIAL           (0)
1194 #define FR_TLS_EXPIRATION       (1)
1195 #define FR_TLS_SUBJECT          (2)
1196 #define FR_TLS_ISSUER           (3)
1197 #define FR_TLS_CN               (4)
1198 #define FR_TLS_SAN_EMAIL        (5)
1199
1200 /*
1201  *      Before trusting a certificate, you must make sure that the
1202  *      certificate is 'valid'. There are several steps that your
1203  *      application can take in determining if a certificate is
1204  *      valid. Commonly used steps are:
1205  *
1206  *      1.Verifying the certificate's signature, and verifying that
1207  *      the certificate has been issued by a trusted Certificate
1208  *      Authority.
1209  *
1210  *      2.Verifying that the certificate is valid for the present date
1211  *      (i.e. it is being presented within its validity dates).
1212  *
1213  *      3.Verifying that the certificate has not been revoked by its
1214  *      issuing Certificate Authority, by checking with respect to a
1215  *      Certificate Revocation List (CRL).
1216  *
1217  *      4.Verifying that the credentials presented by the certificate
1218  *      fulfill additional requirements specific to the application,
1219  *      such as with respect to access control lists or with respect
1220  *      to OCSP (Online Certificate Status Processing).
1221  *
1222  *      NOTE: This callback will be called multiple times based on the
1223  *      depth of the root certificate chain
1224  */
1225 int cbtls_verify(int ok, X509_STORE_CTX *ctx)
1226 {
1227         char subject[1024]; /* Used for the subject name */
1228         char issuer[1024]; /* Used for the issuer name */
1229         char common_name[1024];
1230         char cn_str[1024];
1231         char buf[64];
1232         X509 *client_cert;
1233         SSL *ssl;
1234         int err, depth, lookup, loc;
1235         fr_tls_server_conf_t *conf;
1236         int my_ok = ok;
1237         REQUEST *request;
1238         ASN1_INTEGER *sn = NULL;
1239         ASN1_TIME *asn_time = NULL;
1240         VALUE_PAIR **certs;
1241         char **identity;
1242 #ifdef HAVE_OPENSSL_OCSP_H
1243         X509_STORE *ocsp_store = NULL;
1244         X509 *issuer_cert;
1245 #endif
1246
1247         client_cert = X509_STORE_CTX_get_current_cert(ctx);
1248         err = X509_STORE_CTX_get_error(ctx);
1249         depth = X509_STORE_CTX_get_error_depth(ctx);
1250
1251         lookup = depth;
1252
1253         /*
1254          *      Log client/issuing cert.  If there's an error, log
1255          *      issuing cert.
1256          */
1257         if ((lookup > 1) && !my_ok) lookup = 1;
1258
1259         /*
1260          * Retrieve the pointer to the SSL of the connection currently treated
1261          * and the application specific data stored into the SSL object.
1262          */
1263         ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
1264         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1265         if (!conf) return 1;
1266
1267         request = (REQUEST *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
1268
1269         if (!request) return 1; /* FIXME: outbound TLS */
1270
1271         rad_assert(request != NULL);
1272         certs = (VALUE_PAIR **)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CERTS);
1273         rad_assert(certs != NULL);
1274         identity = (char **)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_IDENTITY);
1275 #ifdef HAVE_OPENSSL_OCSP_H
1276         ocsp_store = (X509_STORE *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_STORE);
1277 #endif
1278
1279
1280         /*
1281          *      Get the Serial Number
1282          */
1283         buf[0] = '\0';
1284         sn = X509_get_serialNumber(client_cert);
1285
1286         /*
1287          *      For this next bit, we create the attributes *only* if
1288          *      we're at the client or issuing certificate, AND we
1289          *      have a user identity.  i.e. we don't create the
1290          *      attributes for RadSec connections.
1291          */
1292         if (identity &&
1293             (lookup <= 1) && sn && ((size_t) sn->length < (sizeof(buf) / 2))) {
1294                 char *p = buf;
1295                 int i;
1296
1297                 for (i = 0; i < sn->length; i++) {
1298                         sprintf(p, "%02x", (unsigned int)sn->data[i]);
1299                         p += 2;
1300                 }
1301                 pairadd(certs,
1302                         pairmake(cert_attr_names[FR_TLS_SERIAL][lookup], buf, T_OP_SET));
1303         }
1304
1305
1306         /*
1307          *      Get the Expiration Date
1308          */
1309         buf[0] = '\0';
1310         asn_time = X509_get_notAfter(client_cert);
1311         if (identity && (lookup <= 1) && asn_time &&
1312             (asn_time->length < MAX_STRING_LEN)) {
1313                 memcpy(buf, (char*) asn_time->data, asn_time->length);
1314                 buf[asn_time->length] = '\0';
1315                 pairadd(certs,
1316                         pairmake(cert_attr_names[FR_TLS_EXPIRATION][lookup], buf, T_OP_SET));
1317         }
1318
1319         /*
1320          *      Get the Subject & Issuer
1321          */
1322         subject[0] = issuer[0] = '\0';
1323         X509_NAME_oneline(X509_get_subject_name(client_cert), subject,
1324                           sizeof(subject));
1325         subject[sizeof(subject) - 1] = '\0';
1326         if (identity && (lookup <= 1) && subject[0] &&
1327             (strlen(subject) < MAX_STRING_LEN)) {
1328                 pairadd(certs,
1329                         pairmake(cert_attr_names[FR_TLS_SUBJECT][lookup], subject, T_OP_SET));
1330         }
1331
1332         X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), issuer,
1333                           sizeof(issuer));
1334         issuer[sizeof(issuer) - 1] = '\0';
1335         if (identity && (lookup <= 1) && issuer[0] &&
1336             (strlen(issuer) < MAX_STRING_LEN)) {
1337                 pairadd(certs,
1338                         pairmake(cert_attr_names[FR_TLS_ISSUER][lookup], issuer, T_OP_SET));
1339         }
1340
1341         /*
1342          *      Get the Common Name
1343          */
1344         X509_NAME_get_text_by_NID(X509_get_subject_name(client_cert),
1345                                   NID_commonName, common_name, sizeof(common_name));
1346         common_name[sizeof(common_name) - 1] = '\0';
1347         if (identity && (lookup <= 1) && common_name[0] &&
1348             (strlen(common_name) < MAX_STRING_LEN)) {
1349                 pairadd(certs,
1350                         pairmake(cert_attr_names[FR_TLS_CN][lookup], common_name, T_OP_SET));
1351         }
1352
1353 #ifdef GEN_EMAIL
1354         /*
1355          *      Get the RFC822 Subject Alternative Name
1356          */
1357         loc = X509_get_ext_by_NID(client_cert, NID_subject_alt_name, 0);
1358         if (lookup <= 1 && loc >= 0) {
1359                 X509_EXTENSION *ext = NULL;
1360                 GENERAL_NAMES *names = NULL;
1361                 int i;
1362
1363                 if ((ext = X509_get_ext(client_cert, loc)) &&
1364                     (names = X509V3_EXT_d2i(ext))) {
1365                         for (i = 0; i < sk_GENERAL_NAME_num(names); i++) {
1366                                 GENERAL_NAME *name = sk_GENERAL_NAME_value(names, i);
1367
1368                                 switch (name->type) {
1369                                 case GEN_EMAIL:
1370                                         if (ASN1_STRING_length(name->d.rfc822Name) >= MAX_STRING_LEN)
1371                                                 break;
1372
1373                                         pairadd(certs,
1374                                                 pairmake(cert_attr_names[FR_TLS_SAN_EMAIL][lookup],
1375                                                          ASN1_STRING_data(name->d.rfc822Name), T_OP_SET));
1376                                         break;
1377                                 default:
1378                                         /* XXX TODO handle other SAN types */
1379                                         break;
1380                                 }
1381                         }
1382                 }
1383                 if (names != NULL)
1384                         sk_GENERAL_NAME_free(names);
1385         }
1386 #endif  /* GEN_EMAIL */
1387
1388         /*
1389          *      If the CRL has expired, that might still be OK.
1390          */
1391         if (!my_ok &&
1392             (conf->allow_expired_crl) &&
1393             (err == X509_V_ERR_CRL_HAS_EXPIRED)) {
1394                 my_ok = 1;
1395                 X509_STORE_CTX_set_error( ctx, 0 );
1396         }
1397
1398         if (!my_ok) {
1399                 const char *p = X509_verify_cert_error_string(err);
1400                 radlog(L_ERR,"--> verify error:num=%d:%s\n",err, p);
1401                 radius_pairmake(request, &request->packet->vps,
1402                                 "Module-Failure-Message", p, T_OP_SET);
1403                 return my_ok;
1404         }
1405
1406         switch (ctx->error) {
1407
1408         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
1409                 radlog(L_ERR, "issuer= %s\n", issuer);
1410                 break;
1411         case X509_V_ERR_CERT_NOT_YET_VALID:
1412         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
1413                 radlog(L_ERR, "notBefore=");
1414 #if 0
1415                 ASN1_TIME_print(bio_err, X509_get_notBefore(ctx->current_cert));
1416 #endif
1417                 break;
1418         case X509_V_ERR_CERT_HAS_EXPIRED:
1419         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
1420                 radlog(L_ERR, "notAfter=");
1421 #if 0
1422                 ASN1_TIME_print(bio_err, X509_get_notAfter(ctx->current_cert));
1423 #endif
1424                 break;
1425         }
1426
1427         /*
1428          *      If we're at the actual client cert, apply additional
1429          *      checks.
1430          */
1431         if (depth == 0) {
1432                 /*
1433                  *      If the conf tells us to, check cert issuer
1434                  *      against the specified value and fail
1435                  *      verification if they don't match.
1436                  */
1437                 if (conf->check_cert_issuer &&
1438                     (strcmp(issuer, conf->check_cert_issuer) != 0)) {
1439                         radlog(L_AUTH, "rlm_eap_tls: Certificate issuer (%s) does not match specified value (%s)!", issuer, conf->check_cert_issuer);
1440                         my_ok = 0;
1441                 }
1442
1443                 /*
1444                  *      If the conf tells us to, check the CN in the
1445                  *      cert against xlat'ed value, but only if the
1446                  *      previous checks passed.
1447                  */
1448                 if (my_ok && conf->check_cert_cn) {
1449                         if (!radius_xlat(cn_str, sizeof(cn_str), conf->check_cert_cn, request, NULL)) {
1450                                 radlog(L_ERR, "rlm_eap_tls (%s): xlat failed.",
1451                                        conf->check_cert_cn);
1452                                 /* if this fails, fail the verification */
1453                                 my_ok = 0;
1454                         } else {
1455                                 RDEBUG2("checking certificate CN (%s) with xlat'ed value (%s)", common_name, cn_str);
1456                                 if (strcmp(cn_str, common_name) != 0) {
1457                                         radlog(L_AUTH, "rlm_eap_tls: Certificate CN (%s) does not match specified value (%s)!", common_name, cn_str);
1458                                         my_ok = 0;
1459                                 }
1460                         }
1461                 } /* check_cert_cn */
1462
1463 #ifdef HAVE_OPENSSL_OCSP_H
1464                 if (my_ok && conf->ocsp_enable){
1465                         RDEBUG2("--> Starting OCSP Request");
1466                         if(X509_STORE_CTX_get1_issuer(&issuer_cert, ctx, client_cert)!=1) {
1467                                 radlog(L_ERR, "Error: Couldn't get issuer_cert for %s", common_name);
1468                         }
1469                         my_ok = ocsp_check(ocsp_store, issuer_cert, client_cert, conf);
1470                 }
1471 #endif
1472
1473                 while (conf->verify_client_cert_cmd) {
1474                         char filename[256];
1475                         int fd;
1476                         FILE *fp;
1477
1478                         snprintf(filename, sizeof(filename), "%s/%s.client.XXXXXXXX",
1479                                  conf->verify_tmp_dir, progname);
1480                         fd = mkstemp(filename);
1481                         if (fd < 0) {
1482                                 RDEBUG("Failed creating file in %s: %s",
1483                                        conf->verify_tmp_dir, strerror(errno));
1484                                 break;
1485                         }
1486
1487                         fp = fdopen(fd, "w");
1488                         if (!fp) {
1489                                 RDEBUG("Failed opening file %s: %s",
1490                                        filename, strerror(errno));
1491                                 break;
1492                         }
1493
1494                         if (!PEM_write_X509(fp, client_cert)) {
1495                                 fclose(fp);
1496                                 RDEBUG("Failed writing certificate to file");
1497                                 goto do_unlink;
1498                         }
1499                         fclose(fp);
1500
1501                         if (!radius_pairmake(request, &request->packet->vps,
1502                                              "TLS-Client-Cert-Filename",
1503                                              filename, T_OP_SET)) {
1504                                 RDEBUG("Failed creating TLS-Client-Cert-Filename");
1505
1506                                 goto do_unlink;
1507                         }
1508
1509                         RDEBUG("Verifying client certificate: %s",
1510                                conf->verify_client_cert_cmd);
1511                         if (radius_exec_program(conf->verify_client_cert_cmd,
1512                                                 request, 1, NULL, 0,
1513                                                 request->packet->vps,
1514                                                 NULL, 1) != 0) {
1515                                 radlog(L_AUTH, "rlm_eap_tls: Certificate CN (%s) fails external verification!", common_name);
1516                                 my_ok = 0;
1517                         } else {
1518                                 RDEBUG("Client certificate CN %s passed external validation", common_name);
1519                         }
1520
1521                 do_unlink:
1522                         unlink(filename);
1523                         break;
1524                 }
1525
1526
1527         } /* depth == 0 */
1528
1529         if (debug_flag > 0) {
1530                 RDEBUG2("chain-depth=%d, ", depth);
1531                 RDEBUG2("error=%d", err);
1532
1533                 if (identity) RDEBUG2("--> User-Name = %s", *identity);
1534                 RDEBUG2("--> BUF-Name = %s", common_name);
1535                 RDEBUG2("--> subject = %s", subject);
1536                 RDEBUG2("--> issuer  = %s", issuer);
1537                 RDEBUG2("--> verify return:%d", my_ok);
1538         }
1539         return my_ok;
1540 }
1541
1542
1543 #ifdef HAVE_OPENSSL_OCSP_H
1544 /*
1545  *      Create Global X509 revocation store and use it to verify
1546  *      OCSP responses
1547  *
1548  *      - Load the trusted CAs
1549  *      - Load the trusted issuer certificates
1550  */
1551 static X509_STORE *init_revocation_store(fr_tls_server_conf_t *conf)
1552 {
1553         X509_STORE *store = NULL;
1554
1555         store = X509_STORE_new();
1556
1557         /* Load the CAs we trust */
1558         if (conf->ca_file || conf->ca_path)
1559                 if(!X509_STORE_load_locations(store, conf->ca_file, conf->ca_path)) {
1560                         radlog(L_ERR, "rlm_eap: X509_STORE error %s", ERR_error_string(ERR_get_error(), NULL));
1561                         radlog(L_ERR, "rlm_eap_tls: Error reading Trusted root CA list %s",conf->ca_file );
1562                         return NULL;
1563                 }
1564
1565 #ifdef X509_V_FLAG_CRL_CHECK
1566         if (conf->check_crl)
1567                 X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK);
1568 #endif
1569         return store;
1570 }
1571 #endif  /* HAVE_OPENSSL_OCSP_H */
1572
1573 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
1574 #ifndef OPENSSL_NO_ECDH
1575 static int set_ecdh_curve(SSL_CTX *ctx, const char *ecdh_curve)
1576 {
1577         int      nid;
1578         EC_KEY  *ecdh;
1579
1580         if (!ecdh_curve || !*ecdh_curve) return 0;
1581
1582         nid = OBJ_sn2nid(ecdh_curve);
1583         if (!nid) {
1584                 radlog(L_ERR, "Unknown ecdh_curve \"%s\"", ecdh_curve);
1585                 return -1;
1586         }
1587
1588         ecdh = EC_KEY_new_by_curve_name(nid);
1589         if (!ecdh) {
1590                 radlog(L_ERR, "Unable to create new curve \"%s\"", ecdh_curve);
1591                 return -1;
1592         }
1593
1594         SSL_CTX_set_tmp_ecdh(ctx, ecdh);
1595
1596         SSL_CTX_set_options(ctx, SSL_OP_SINGLE_ECDH_USE);
1597
1598         EC_KEY_free(ecdh);
1599
1600         return 0;
1601 }
1602 #endif
1603 #endif
1604
1605 /* index we use to store cached session VPs
1606  * needs to be dynamic so we can supply a "free" function
1607  */
1608 static int FR_TLS_EX_INDEX_VPS = -1;
1609
1610 /*
1611  * DIE OPENSSL DIE DIE DIE
1612  *
1613  * What a palaver, just to free some data attached the
1614  * session. We need to do this because the "remove" callback
1615  * is called when refcount > 0 sometimes, if another thread
1616  * is using the session
1617  */
1618 static void sess_free_vps(UNUSED void *parent, void *data_ptr,
1619                                 UNUSED CRYPTO_EX_DATA *ad, UNUSED int idx,
1620                                 UNUSED long argl, UNUSED void *argp)
1621 {
1622         VALUE_PAIR *vp = data_ptr;
1623         if (!vp) return;
1624
1625         DEBUG2("  Freeing cached session VPs %p", vp);
1626
1627         pairfree(&vp);
1628 }
1629
1630
1631 /*
1632  *      Create Global context SSL and use it in every new session
1633  *
1634  *      - Load the trusted CAs
1635  *      - Load the Private key & the certificate
1636  *      - Set the Context options & Verify options
1637  */
1638 static SSL_CTX *init_tls_ctx(fr_tls_server_conf_t *conf, int client)
1639 {
1640         const SSL_METHOD *meth;
1641         SSL_CTX *ctx;
1642         X509_STORE *certstore;
1643         int verify_mode = SSL_VERIFY_NONE;
1644         int ctx_options = 0;
1645         int type;
1646
1647         /*
1648          *      Add all the default ciphers and message digests
1649          *      Create our context.
1650          */
1651         SSL_library_init();
1652         SSL_load_error_strings();
1653
1654         /*
1655          *      SHA256 is in all versions of OpenSSL, but isn't
1656          *      initialized by default.  It's needed for WiMAX
1657          *      certificates.
1658          */
1659 #ifdef HAVE_OPENSSL_EVP_SHA256
1660         EVP_add_digest(EVP_sha256());
1661 #endif
1662
1663         meth = TLSv1_method();
1664         ctx = SSL_CTX_new(meth);
1665
1666         /*
1667          * Identify the type of certificates that needs to be loaded
1668          */
1669         if (conf->file_type) {
1670                 type = SSL_FILETYPE_PEM;
1671         } else {
1672                 type = SSL_FILETYPE_ASN1;
1673         }
1674
1675         /*
1676          * Set the password to load private key
1677          */
1678         if (conf->private_key_password) {
1679 #ifdef __APPLE__
1680                 /*
1681                  * We don't want to put the private key password in eap.conf, so  check
1682                  * for our special string which indicates we should get the password
1683                  * programmatically.
1684                  */
1685                 const char* special_string = "Apple:UseCertAdmin";
1686                 if (strncmp(conf->private_key_password,
1687                                         special_string,
1688                                         strlen(special_string)) == 0)
1689                 {
1690                         char cmd[256];
1691                         const long max_password_len = 128;
1692                         snprintf(cmd, sizeof(cmd) - 1,
1693                                          "/usr/sbin/certadmin --get-private-key-passphrase \"%s\"",
1694                                          conf->private_key_file);
1695
1696                         DEBUG2("rlm_eap: Getting private key passphrase using command \"%s\"", cmd);
1697
1698                         FILE* cmd_pipe = popen(cmd, "r");
1699                         if (!cmd_pipe) {
1700                                 radlog(L_ERR, "rlm_eap: %s command failed.      Unable to get private_key_password", cmd);
1701                                 radlog(L_ERR, "rlm_eap: Error reading private_key_file %s", conf->private_key_file);
1702                                 return NULL;
1703                         }
1704
1705                         free(conf->private_key_password);
1706                         conf->private_key_password = malloc(max_password_len * sizeof(char));
1707                         if (!conf->private_key_password) {
1708                                 radlog(L_ERR, "rlm_eap: Can't malloc space for private_key_password");
1709                                 radlog(L_ERR, "rlm_eap: Error reading private_key_file %s", conf->private_key_file);
1710                                 pclose(cmd_pipe);
1711                                 return NULL;
1712                         }
1713
1714                         fgets(conf->private_key_password, max_password_len, cmd_pipe);
1715                         pclose(cmd_pipe);
1716
1717                         /* Get rid of newline at end of password. */
1718                         conf->private_key_password[strlen(conf->private_key_password) - 1] = '\0';
1719                         DEBUG2("rlm_eap:  Password from command = \"%s\"", conf->private_key_password);
1720                 }
1721 #endif
1722                 SSL_CTX_set_default_passwd_cb_userdata(ctx, conf->private_key_password);
1723                 SSL_CTX_set_default_passwd_cb(ctx, cbtls_password);
1724         }
1725
1726 #ifdef PSK_MAX_IDENTITY_LEN
1727         if ((conf->psk_identity && !conf->psk_password) ||
1728             (!conf->psk_identity && conf->psk_password) ||
1729             (conf->psk_identity && !*conf->psk_identity) ||
1730             (conf->psk_password && !*conf->psk_password)) {
1731                 radlog(L_ERR, "Invalid PSK Configuration: psk_identity or psk_password are empty");
1732                 return NULL;
1733         }
1734
1735         if (conf->psk_identity) {
1736                 size_t psk_len, hex_len;
1737                 char buffer[PSK_MAX_PSK_LEN];
1738
1739                 if (conf->certificate_file ||
1740                     conf->private_key_password || conf->private_key_file ||
1741                     conf->ca_file || conf->ca_path) {
1742                         radlog(L_ERR, "When PSKs are used, No certificate configuration is permitted");
1743                         return NULL;
1744                 }
1745
1746                 if (client) {
1747                         SSL_CTX_set_psk_client_callback(ctx,
1748                                                         psk_client_callback);
1749                 } else {
1750                         SSL_CTX_set_psk_server_callback(ctx,
1751                                                         psk_server_callback);
1752                 }
1753
1754                 psk_len = strlen(conf->psk_password);
1755                 if (strlen(conf->psk_password) > (2 * PSK_MAX_PSK_LEN)) {
1756                         radlog(L_ERR, "psk_hexphrase is too long (max %d)",
1757                                PSK_MAX_PSK_LEN);
1758                         return NULL;
1759                 }
1760
1761                 hex_len = fr_hex2bin(conf->psk_password, buffer, psk_len);
1762                 if (psk_len != (2 * hex_len)) {
1763                         radlog(L_ERR, "psk_hexphrase is not all hex");
1764                         return NULL;
1765                 }
1766
1767                 goto post_ca;
1768         }
1769 #endif
1770
1771         /*
1772          *      Load our keys and certificates
1773          *
1774          *      If certificates are of type PEM then we can make use
1775          *      of cert chain authentication using openssl api call
1776          *      SSL_CTX_use_certificate_chain_file.  Please see how
1777          *      the cert chain needs to be given in PEM from
1778          *      openSSL.org
1779          */
1780         if (!conf->certificate_file) goto load_ca;
1781
1782         if (type == SSL_FILETYPE_PEM) {
1783                 if (!(SSL_CTX_use_certificate_chain_file(ctx, conf->certificate_file))) {
1784                         radlog(L_ERR, "Error reading certificate file %s:%s",
1785                                conf->certificate_file,
1786                                ERR_error_string(ERR_get_error(), NULL));
1787                         return NULL;
1788                 }
1789
1790         } else if (!(SSL_CTX_use_certificate_file(ctx, conf->certificate_file, type))) {
1791                 radlog(L_ERR, "Error reading certificate file %s:%s",
1792                        conf->certificate_file,
1793                        ERR_error_string(ERR_get_error(), NULL));
1794                 return NULL;
1795         }
1796
1797         /* Load the CAs we trust */
1798 load_ca:
1799         if (conf->ca_file || conf->ca_path) {
1800                 if (!SSL_CTX_load_verify_locations(ctx, conf->ca_file, conf->ca_path)) {
1801                         radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
1802                         radlog(L_ERR, "rlm_eap_tls: Error reading Trusted root CA list %s",conf->ca_file );
1803                         return NULL;
1804                 }
1805         }
1806         if (conf->ca_file && *conf->ca_file) SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(conf->ca_file));
1807
1808         if (conf->private_key_file) {
1809                 if (!(SSL_CTX_use_PrivateKey_file(ctx, conf->private_key_file, type))) {
1810                         radlog(L_ERR, "Failed reading private key file %s:%s",
1811                                conf->private_key_file,
1812                                ERR_error_string(ERR_get_error(), NULL));
1813                         return NULL;
1814                 }
1815
1816                 /*
1817                  * Check if the loaded private key is the right one
1818                  */
1819                 if (!SSL_CTX_check_private_key(ctx)) {
1820                         radlog(L_ERR, "Private key does not match the certificate public key");
1821                         return NULL;
1822                 }
1823         }
1824
1825 #ifdef PSK_MAX_IDENTITY_LEN
1826 post_ca:
1827 #endif
1828
1829         /*
1830          *      Set ctx_options
1831          */
1832         ctx_options |= SSL_OP_NO_SSLv2;
1833         ctx_options |= SSL_OP_NO_SSLv3;
1834 #ifdef SSL_OP_NO_TICKET
1835         ctx_options |= SSL_OP_NO_TICKET ;
1836 #endif
1837
1838         /*
1839          *      SSL_OP_SINGLE_DH_USE must be used in order to prevent
1840          *      small subgroup attacks and forward secrecy. Always
1841          *      using
1842          *
1843          *      SSL_OP_SINGLE_DH_USE has an impact on the computer
1844          *      time needed during negotiation, but it is not very
1845          *      large.
1846          */
1847         ctx_options |= SSL_OP_SINGLE_DH_USE;
1848
1849         /*
1850          *      SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS to work around issues
1851          *      in Windows Vista client.
1852          *      http://www.openssl.org/~bodo/tls-cbc.txt
1853          *      http://www.nabble.com/(RADIATOR)-Radiator-Version-3.16-released-t2600070.html
1854          */
1855         ctx_options |= SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
1856
1857         SSL_CTX_set_options(ctx, ctx_options);
1858
1859         /*
1860          *      TODO: Set the RSA & DH
1861          *      SSL_CTX_set_tmp_rsa_callback(ctx, cbtls_rsa);
1862          *      SSL_CTX_set_tmp_dh_callback(ctx, cbtls_dh);
1863          */
1864
1865         /*
1866          *      set the message callback to identify the type of
1867          *      message.  For every new session, there can be a
1868          *      different callback argument.
1869          *
1870          *      SSL_CTX_set_msg_callback(ctx, cbtls_msg);
1871          */
1872
1873         /*
1874          *      Set eliptical curve crypto configuration.
1875          */
1876 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
1877 #ifndef OPENSSL_NO_ECDH
1878         if (set_ecdh_curve(ctx, conf->ecdh_curve) < 0) {
1879                 return NULL;
1880         }
1881 #endif
1882 #endif
1883
1884         /* Set Info callback */
1885         SSL_CTX_set_info_callback(ctx, cbtls_info);
1886
1887         /*
1888          *      Callbacks, etc. for session resumption.
1889          */
1890         if (conf->session_cache_enable) {
1891                 SSL_CTX_sess_set_new_cb(ctx, cbtls_new_session);
1892                 SSL_CTX_sess_set_get_cb(ctx, cbtls_get_session);
1893                 SSL_CTX_sess_set_remove_cb(ctx, cbtls_remove_session);
1894
1895                 SSL_CTX_set_quiet_shutdown(ctx, 1);
1896                 if (FR_TLS_EX_INDEX_VPS < 0)
1897                         FR_TLS_EX_INDEX_VPS = SSL_SESSION_get_ex_new_index(0, NULL, NULL, NULL, sess_free_vps);
1898         }
1899
1900         /*
1901          *      Check the certificates for revocation.
1902          */
1903 #ifdef X509_V_FLAG_CRL_CHECK
1904         if (conf->check_crl) {
1905           certstore = SSL_CTX_get_cert_store(ctx);
1906           if (certstore == NULL) {
1907             radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
1908             radlog(L_ERR, "rlm_eap_tls: Error reading Certificate Store");
1909             return NULL;
1910           }
1911           X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK);
1912         }
1913 #endif
1914
1915         /*
1916          *      Set verify modes
1917          *      Always verify the peer certificate
1918          */
1919         verify_mode |= SSL_VERIFY_PEER;
1920         verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
1921         verify_mode |= SSL_VERIFY_CLIENT_ONCE;
1922         SSL_CTX_set_verify(ctx, verify_mode, cbtls_verify);
1923
1924         if (conf->verify_depth) {
1925                 SSL_CTX_set_verify_depth(ctx, conf->verify_depth);
1926         }
1927
1928         /* Load randomness */
1929         if (!(RAND_load_file(conf->random_file, 1024*1024))) {
1930                 radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
1931                 radlog(L_ERR, "rlm_eap_tls: Error loading randomness");
1932                 return NULL;
1933         }
1934
1935         /*
1936          * Set the cipher list if we were told to
1937          */
1938         if (conf->cipher_list) {
1939                 if (!SSL_CTX_set_cipher_list(ctx, conf->cipher_list)) {
1940                         radlog(L_ERR, "rlm_eap_tls: Error setting cipher list");
1941                         return NULL;
1942                 }
1943         }
1944
1945         /*
1946          *      Setup session caching
1947          */
1948         if (conf->session_cache_enable) {
1949                 /*
1950                  *      Create a unique context Id per EAP-TLS configuration.
1951                  */
1952                 if (conf->session_id_name) {
1953                         snprintf(conf->session_context_id,
1954                                  sizeof(conf->session_context_id),
1955                                  "FR eap %s",
1956                                  conf->session_id_name);
1957                 } else {
1958                         snprintf(conf->session_context_id,
1959                                  sizeof(conf->session_context_id),
1960                                  "FR eap %p", conf);
1961                 }
1962
1963                 /*
1964                  *      Cache it, and DON'T auto-clear it.
1965                  */
1966                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_SERVER | SSL_SESS_CACHE_NO_AUTO_CLEAR);
1967
1968                 SSL_CTX_set_session_id_context(ctx,
1969                                                (unsigned char *) conf->session_context_id,
1970                                                (unsigned int) strlen(conf->session_context_id));
1971
1972                 /*
1973                  *      Our timeout is in hours, this is in seconds.
1974                  */
1975                 SSL_CTX_set_timeout(ctx, conf->session_timeout * 3600);
1976
1977                 /*
1978                  *      Set the maximum number of entries in the
1979                  *      session cache.
1980                  */
1981                 SSL_CTX_sess_set_cache_size(ctx, conf->session_cache_size);
1982
1983         } else {
1984                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
1985         }
1986
1987         return ctx;
1988 }
1989
1990
1991 void tls_server_conf_free(fr_tls_server_conf_t *conf)
1992 {
1993         if (!conf) return;
1994
1995         if (conf->cs) cf_section_parse_free(conf->cs, conf);
1996
1997         if (conf->ctx) SSL_CTX_free(conf->ctx);
1998
1999 #ifdef HAVE_OPENSSL_OCSP_H
2000         if (conf->ocsp_store) X509_STORE_free(conf->ocsp_store);
2001         conf->ocsp_store = NULL;
2002 #endif
2003
2004         memset(conf, 0, sizeof(*conf));
2005         free(conf);
2006 }
2007
2008
2009 fr_tls_server_conf_t *tls_server_conf_parse(CONF_SECTION *cs)
2010 {
2011         fr_tls_server_conf_t *conf;
2012
2013         conf = malloc(sizeof(*conf));
2014         if (!conf) {
2015                 radlog(L_ERR, "Out of memory");
2016                 return NULL;
2017         }
2018         memset(conf, 0, sizeof(*conf));
2019
2020         if (cf_section_parse(cs, conf, tls_server_config) < 0) {
2021         error:
2022                 tls_server_conf_free(conf);
2023                 return NULL;
2024         }
2025
2026         /*
2027          *      Save people from their own stupidity.
2028          */
2029         if (conf->fragment_size < 100) conf->fragment_size = 100;
2030
2031         /*
2032          *      This magic makes the administrators life HUGELY easier
2033          *      on initial deployments.
2034          *
2035          *      If the server starts up in debugging mode, AND the
2036          *      bootstrap command is configured, AND it exists, AND
2037          *      there is no server certificate
2038          */
2039         if (conf->make_cert_command && (debug_flag >= 2)) {
2040                 struct stat buf;
2041
2042                 if ((stat(conf->make_cert_command, &buf) == 0) &&
2043                     (stat(conf->certificate_file, &buf) < 0) &&
2044                     (errno == ENOENT) &&
2045                     (radius_exec_program(conf->make_cert_command, NULL, 1,
2046                                          NULL, 0, NULL, NULL, 0) != 0)) {
2047                         goto error;
2048                 }
2049         }
2050
2051         if (!conf->private_key_file) {
2052                 radlog(L_ERR, "TLS Server requires a private key file");
2053                 goto error;
2054         }
2055
2056         if (!conf->certificate_file) {
2057                 radlog(L_ERR, "TLS Server requires a certificate file");
2058                 goto error;
2059         }
2060
2061         /*
2062          *      Initialize TLS
2063          */
2064         conf->ctx = init_tls_ctx(conf, 0);
2065         if (conf->ctx == NULL) {
2066                 goto error;
2067         }
2068
2069 #ifdef HAVE_OPENSSL_OCSP_H
2070         /*
2071          *      Initialize OCSP Revocation Store
2072          */
2073         if (conf->ocsp_enable) {
2074                 conf->ocsp_store = init_revocation_store(conf);
2075                 if (conf->ocsp_store == NULL) goto error;
2076         }
2077 #endif /*HAVE_OPENSSL_OCSP_H*/
2078
2079         if (load_dh_params(conf->ctx, conf->dh_file) < 0) {
2080                 goto error;
2081         }
2082
2083         if (generate_eph_rsa_key(conf->ctx) < 0) {
2084                 goto error;
2085         }
2086
2087         if (conf->verify_tmp_dir) {
2088                 if (chmod(conf->verify_tmp_dir, S_IRWXU) < 0) {
2089                         radlog(L_ERR, "Failed changing permissions on %s: %s", conf->verify_tmp_dir, strerror(errno));
2090                         goto error;
2091                 }
2092         }
2093
2094         if (conf->verify_client_cert_cmd && !conf->verify_tmp_dir) {
2095                 radlog(L_ERR, "You MUST set the verify directory in order to use verify_client_cmd");
2096                 goto error;
2097         }
2098
2099         return conf;
2100 }
2101
2102 fr_tls_server_conf_t *tls_client_conf_parse(CONF_SECTION *cs)
2103 {
2104         fr_tls_server_conf_t *conf;
2105
2106         conf = malloc(sizeof(*conf));
2107         if (!conf) {
2108                 radlog(L_ERR, "Out of memory");
2109                 return NULL;
2110         }
2111         memset(conf, 0, sizeof(*conf));
2112
2113         if (cf_section_parse(cs, conf, tls_client_config) < 0) {
2114         error:
2115                 tls_server_conf_free(conf);
2116                 return NULL;
2117         }
2118
2119         /*
2120          *      Save people from their own stupidity.
2121          */
2122         if (conf->fragment_size < 100) conf->fragment_size = 100;
2123
2124         /*
2125          *      Initialize TLS
2126          */
2127         conf->ctx = init_tls_ctx(conf, 1);
2128         if (conf->ctx == NULL) {
2129                 goto error;
2130         }
2131
2132         if (load_dh_params(conf->ctx, conf->dh_file) < 0) {
2133                 goto error;
2134         }
2135
2136         if (generate_eph_rsa_key(conf->ctx) < 0) {
2137                 goto error;
2138         }
2139
2140         return conf;
2141 }
2142
2143 int tls_success(tls_session_t *ssn, REQUEST *request)
2144 {
2145         VALUE_PAIR *vp, *vps = NULL;
2146         fr_tls_server_conf_t *conf;
2147
2148         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CONF);
2149         rad_assert(conf != NULL);
2150
2151         /*
2152          *      If there's no session resumption, delete the entry
2153          *      from the cache.  This means either it's disabled
2154          *      globally for this SSL context, OR we were told to
2155          *      disable it for this user.
2156          *
2157          *      This also means you can't turn it on just for one
2158          *      user.
2159          */
2160         if ((!ssn->allow_session_resumption) ||
2161             (((vp = pairfind(request->config_items, 1127, 0)) != NULL) &&
2162              (vp->vp_integer == 0))) {
2163                 SSL_CTX_remove_session(ssn->ctx,
2164                                        ssn->ssl->session);
2165                 ssn->allow_session_resumption = 0;
2166
2167                 /*
2168                  *      If we're in a resumed session and it's
2169                  *      not allowed,
2170                  */
2171                 if (SSL_session_reused(ssn->ssl)) {
2172                         RDEBUG("FAIL: Forcibly stopping session resumption as it is not allowed.");
2173                         return -1;
2174                 }
2175
2176                 /*
2177                  *      Else resumption IS allowed, so we store the
2178                  *      user data in the cache.
2179                  */
2180         } else if (!SSL_session_reused(ssn->ssl)) {
2181                 size_t size;
2182                 char buffer[2 * MAX_SESSION_SIZE + 1];
2183
2184                 size = ssn->ssl->session->session_id_length;
2185                 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
2186
2187                 fr_bin2hex(ssn->ssl->session->session_id, buffer, size);
2188
2189
2190                 vp = paircopy2(request->reply->vps, PW_USER_NAME, 0);
2191                 if (vp) pairadd(&vps, vp);
2192
2193                 vp = paircopy2(request->packet->vps, PW_STRIPPED_USER_NAME, 0);
2194                 if (vp) pairadd(&vps, vp);
2195
2196                 vp = paircopy2(request->reply->vps, PW_CACHED_SESSION_POLICY, 0);
2197                 if (vp) pairadd(&vps, vp);
2198
2199                 if (vps) {
2200                         RDEBUG2("Saving session %s vps %p in the cache", buffer, vps);
2201                         SSL_SESSION_set_ex_data(ssn->ssl->session,
2202                                                 FR_TLS_EX_INDEX_VPS, vps);
2203                 } else {
2204                         RDEBUG2("WARNING: No information to cache: session caching will be disabled for session %s", buffer);
2205                         SSL_CTX_remove_session(ssn->ctx,
2206                                                ssn->ssl->session);
2207                 }
2208
2209                 /*
2210                  *      Else the session WAS allowed.  Copy the cached
2211                  *      reply.
2212                  */
2213         } else {
2214                 size_t size;
2215                 char buffer[2 * MAX_SESSION_SIZE + 1];
2216
2217                 size = ssn->ssl->session->session_id_length;
2218                 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
2219
2220                 fr_bin2hex(ssn->ssl->session->session_id, buffer, size);
2221
2222
2223                 vp = SSL_SESSION_get_ex_data(ssn->ssl->session,
2224                                              FR_TLS_EX_INDEX_VPS);
2225                 if (!vp) {
2226                         RDEBUG("WARNING: No information in cached session %s", buffer);
2227                         return -1;
2228
2229                 } else {
2230                         RDEBUG("Adding cached attributes for session %s vps %p to the reply:", buffer, vp);
2231                         debug_pair_list(vp);
2232                         pairadd(&request->reply->vps, paircopy(vp));
2233
2234                         /*
2235                          *      Mark the request as resumed.
2236                          */
2237                         vp = pairmake("EAP-Session-Resumed", "1", T_OP_SET);
2238                         if (vp) pairadd(&request->packet->vps, vp);
2239                 }
2240         }
2241
2242         return 0;
2243 }
2244
2245
2246 void tls_fail(tls_session_t *ssn)
2247 {
2248         /*
2249          *      Force the session to NOT be cached.
2250          */
2251         SSL_CTX_remove_session(ssn->ctx, ssn->ssl->session);
2252 }
2253
2254 fr_tls_status_t tls_application_data(tls_session_t *ssn,
2255                                      REQUEST *request)
2256
2257 {
2258         int err;
2259
2260         /*
2261          *      Decrypt the complete record.
2262          */
2263         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data,
2264                         ssn->dirty_in.used);
2265         if (err != (int) ssn->dirty_in.used) {
2266                 record_init(&ssn->dirty_in);
2267                 RDEBUG("Failed writing %d to SSL BIO: %d",
2268                        ssn->dirty_in.used, err);
2269                 return FR_TLS_FAIL;
2270         }
2271
2272         /*
2273          *      Clear the dirty buffer now that we are done with it
2274          *      and init the clean_out buffer to store decrypted data
2275          */
2276         record_init(&ssn->dirty_in);
2277         record_init(&ssn->clean_out);
2278
2279         /*
2280          *      Read (and decrypt) the tunneled data from the
2281          *      SSL session, and put it into the decrypted
2282          *      data buffer.
2283          */
2284         err = SSL_read(ssn->ssl, ssn->clean_out.data,
2285                        sizeof(ssn->clean_out.data));
2286
2287         if (err < 0) {
2288                 int code;
2289
2290                 RDEBUG("SSL_read Error");
2291
2292                 code = SSL_get_error(ssn->ssl, err);
2293                 switch (code) {
2294                 case SSL_ERROR_WANT_READ:
2295                         return FR_TLS_MORE_FRAGMENTS;
2296                         DEBUG("Error in fragmentation logic: SSL_WANT_READ");
2297                         break;
2298
2299                 case SSL_ERROR_WANT_WRITE:
2300                         DEBUG("Error in fragmentation logic: SSL_WANT_WRITE");
2301                         break;
2302
2303                 default:
2304                         DEBUG("Error in fragmentation logic: ?");
2305
2306                         /*
2307                          *      FIXME: Call int_ssl_check?
2308                          */
2309                         break;
2310                 }
2311                 return FR_TLS_FAIL;
2312         }
2313
2314         if (err == 0) {
2315                 RDEBUG("WARNING: No data inside of the tunnel.");
2316         }
2317
2318         /*
2319          *      Passed all checks, successfully decrypted data
2320          */
2321         ssn->clean_out.used = err;
2322
2323         return FR_TLS_OK;
2324 }
2325
2326
2327 /*
2328  * Acknowledge received is for one of the following messages sent earlier
2329  * 1. Handshake completed Message, so now send, EAP-Success
2330  * 2. Alert Message, now send, EAP-Failure
2331  * 3. Fragment Message, now send, next Fragment
2332  */
2333 fr_tls_status_t tls_ack_handler(tls_session_t *ssn, REQUEST *request)
2334 {
2335         RDEBUG2("Received TLS ACK");
2336
2337         if (ssn == NULL){
2338                 radlog_request(L_ERR, 0, request, "FAIL: Unexpected ACK received.  Could not obtain session information.");
2339                 return FR_TLS_INVALID;
2340         }
2341         if (ssn->info.initialized == 0) {
2342                 RDEBUG("No SSL info available. Waiting for more SSL data.");
2343                 return FR_TLS_REQUEST;
2344         }
2345         if ((ssn->info.content_type == handshake) &&
2346             (ssn->info.origin == 0)) {
2347                 radlog_request(L_ERR, 0, request, "FAIL: ACK without earlier message.");
2348                 return FR_TLS_INVALID;
2349         }
2350
2351         switch (ssn->info.content_type) {
2352         case alert:
2353                 RDEBUG2("ACK alert");
2354                 return FR_TLS_FAIL;
2355
2356         case handshake:
2357                 if ((ssn->info.handshake_type == finished) &&
2358                     (ssn->dirty_out.used == 0)) {
2359                         RDEBUG2("ACK handshake is finished");
2360
2361                         /*
2362                          *      From now on all the content is
2363                          *      application data set it here as nobody else
2364                          *      sets it.
2365                          */
2366                         ssn->info.content_type = application_data;
2367                         return FR_TLS_SUCCESS;
2368                 } /* else more data to send */
2369
2370                 RDEBUG2("ACK handshake fragment handler");
2371                 /* Fragmentation handler, send next fragment */
2372                 return FR_TLS_REQUEST;
2373
2374         case application_data:
2375                 RDEBUG2("ACK handshake fragment handler in application data");
2376                 return FR_TLS_REQUEST;
2377
2378                 /*
2379                  *      For the rest of the conditions, switch over
2380                  *      to the default section below.
2381                  */
2382         default:
2383                 RDEBUG2("ACK default");
2384                 radlog_request(L_ERR, 0, request, "Invalid ACK received: %d",
2385                        ssn->info.content_type);
2386                 return FR_TLS_INVALID;
2387         }
2388 }
2389
2390 static void dump_hex(const char *msg, const uint8_t *data, size_t data_len)
2391 {
2392         size_t i;
2393
2394         if (debug_flag < 3) return;
2395
2396         printf("%s %d\n", msg, (int) data_len);
2397         if (data_len > 256) data_len = 256;
2398
2399         for (i = 0; i < data_len; i++) {
2400                 if ((i & 0x0f) == 0x00) printf ("%02x: ", (unsigned int) i);
2401                 printf("%02x ", data[i]);
2402                 if ((i & 0x0f) == 0x0f) printf ("\n");
2403         }
2404         printf("\n");
2405         fflush(stdout);
2406 }
2407
2408 static void tls_socket_close(rad_listen_t *listener)
2409 {
2410         listen_socket_t *sock = listener->data;
2411
2412         listener->status = RAD_LISTEN_STATUS_REMOVE_FD;
2413         listener->tls = NULL; /* parent owns this! */
2414
2415         if (sock->parent) {
2416                 /*
2417                  *      Decrement the number of connections.
2418                  */
2419                 if (sock->parent->num_connections > 0) {
2420                         sock->parent->num_connections--;
2421                 }
2422                 if (sock->client->num_connections > 0) {
2423                         sock->client->num_connections--;
2424                 }
2425         }
2426
2427         /*
2428          *      Tell the event handler that an FD has disappeared.
2429          */
2430         DEBUG("Client has closed connection");
2431         event_new_fd(listener);
2432
2433         /*
2434          *      Do NOT free the listener here.  It's in use by
2435          *      a request, and will need to hang around until
2436          *      all of the requests are done.
2437          *
2438          *      It is instead free'd in remove_from_request_hash()
2439          */
2440 }
2441
2442 static int tls_socket_write(rad_listen_t *listener, REQUEST *request)
2443 {
2444         uint8_t *p;
2445         ssize_t rcode;
2446         listen_socket_t *sock = listener->data;
2447
2448         p = sock->ssn->dirty_out.data;
2449
2450         while (p < (sock->ssn->dirty_out.data + sock->ssn->dirty_out.used)) {
2451                 RDEBUG3("Writing to socket %d", request->packet->sockfd);
2452                 rcode = write(request->packet->sockfd, p,
2453                               (sock->ssn->dirty_out.data + sock->ssn->dirty_out.used) - p);
2454                 if (rcode <= 0) {
2455                         RDEBUG("Error writing to TLS socket: %s", strerror(errno));
2456
2457                         tls_socket_close(listener);
2458                         return 0;
2459                 }
2460                 p += rcode;
2461         }
2462
2463         sock->ssn->dirty_out.used = 0;
2464
2465         return 1;
2466 }
2467
2468
2469 static int tls_socket_recv(rad_listen_t *listener)
2470 {
2471         int doing_init = FALSE;
2472         ssize_t rcode;
2473         RADIUS_PACKET *packet;
2474         REQUEST *request;
2475         listen_socket_t *sock = listener->data;
2476         fr_tls_status_t status;
2477         RADCLIENT *client = sock->client;
2478
2479         if (!sock->packet) {
2480                 sock->packet = rad_alloc(0);
2481                 if (!sock->packet) return 0;
2482
2483                 sock->packet->sockfd = listener->fd;
2484                 sock->packet->src_ipaddr = sock->other_ipaddr;
2485                 sock->packet->src_port = sock->other_port;
2486                 sock->packet->dst_ipaddr = sock->my_ipaddr;
2487                 sock->packet->dst_port = sock->my_port;
2488
2489                 if (sock->request) sock->request->packet = sock->packet;
2490         }
2491
2492         /*
2493          *      Allocate a REQUEST for debugging.
2494          */
2495         if (!sock->request) {
2496                 sock->request = request = request_alloc();
2497                 if (!sock->request) {
2498                         radlog(L_ERR, "Out of memory");
2499                         return 0;
2500                 }
2501
2502                 rad_assert(request->packet == NULL);
2503                 rad_assert(sock->packet != NULL);
2504                 request->packet = sock->packet;
2505
2506                 request->component = "<core>";
2507                 request->component = "<tls-connect>";
2508
2509                 /*
2510                  *      Not sure if we should do this on every packet...
2511                  */
2512                 request->reply = rad_alloc(0);
2513                 if (!request->reply) return 0;
2514
2515                 request->options = RAD_REQUEST_OPTION_DEBUG2;
2516
2517                 rad_assert(sock->ssn == NULL);
2518
2519                 sock->ssn = tls_new_session(listener->tls, sock->request,
2520                                             listener->tls->require_client_cert);
2521                 if (!sock->ssn) {
2522                         request_free(&sock->request);
2523                         sock->packet = NULL;
2524                         return 0;
2525                 }
2526
2527                 SSL_set_ex_data(sock->ssn->ssl, FR_TLS_EX_INDEX_REQUEST, (void *)request);
2528                 SSL_set_ex_data(sock->ssn->ssl, FR_TLS_EX_INDEX_CERTS, (void *)&request->packet->vps);
2529
2530                 doing_init = TRUE;
2531         }
2532
2533         rad_assert(sock->request != NULL);
2534         rad_assert(sock->request->packet != NULL);
2535         rad_assert(sock->packet != NULL);
2536         rad_assert(sock->ssn != NULL);
2537
2538         request = sock->request;
2539
2540         RDEBUG3("Reading from socket %d", request->packet->sockfd);
2541         PTHREAD_MUTEX_LOCK(&sock->mutex);
2542         rcode = read(request->packet->sockfd,
2543                      sock->ssn->dirty_in.data,
2544                      sizeof(sock->ssn->dirty_in.data));
2545         if ((rcode < 0) && (errno == ECONNRESET)) {
2546         do_close:
2547                 PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2548                 tls_socket_close(listener);
2549                 return 0;
2550         }
2551
2552         if (rcode < 0) {
2553                 RDEBUG("Error reading TLS socket: %s", strerror(errno));
2554                 goto do_close;
2555         }
2556
2557         /*
2558          *      Normal socket close.
2559          */
2560         if (rcode == 0) goto do_close;
2561
2562         sock->ssn->dirty_in.used = rcode;
2563         memset(sock->ssn->dirty_in.data + sock->ssn->dirty_in.used,
2564                0, 16);
2565
2566         dump_hex("READ FROM SSL", sock->ssn->dirty_in.data, sock->ssn->dirty_in.used);
2567
2568         /*
2569          *      Catch attempts to use non-SSL.
2570          */
2571         if (doing_init && (sock->ssn->dirty_in.data[0] != handshake)) {
2572                 RDEBUG("Non-TLS data sent to TLS socket: closing");
2573                 goto do_close;
2574         }
2575
2576         /*
2577          *      Skip ahead to reading application data.
2578          */
2579         if (SSL_is_init_finished(sock->ssn->ssl)) goto app;
2580
2581         if (!tls_handshake_recv(request, sock->ssn)) {
2582                 RDEBUG("FAILED in TLS handshake receive");
2583                 goto do_close;
2584         }
2585
2586         if (sock->ssn->dirty_out.used > 0) {
2587                 tls_socket_write(listener, request);
2588                 PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2589                 return 0;
2590         }
2591
2592 app:
2593         /*
2594          *      FIXME: Run the packet through a virtual server in
2595          *      order to see if we like the certificate presented by
2596          *      the client.
2597          */
2598
2599         status = tls_application_data(sock->ssn, request);
2600         RDEBUG("Application data status %d", status);
2601
2602         if (status == FR_TLS_MORE_FRAGMENTS) {
2603                 PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2604                 return 0;
2605         }
2606
2607         if (sock->ssn->clean_out.used == 0) {
2608                 PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2609                 return 0;
2610         }
2611
2612         dump_hex("TUNNELED DATA", sock->ssn->clean_out.data, sock->ssn->clean_out.used);
2613
2614         /*
2615          *      If the packet is a complete RADIUS packet, return it to
2616          *      the caller.  Otherwise...
2617          */
2618         if ((sock->ssn->clean_out.used < 20) ||
2619             (((sock->ssn->clean_out.data[2] << 8) | sock->ssn->clean_out.data[3]) != (int) sock->ssn->clean_out.used)) {
2620                 RDEBUG("Received bad packet: Length %d contents %d",
2621                        sock->ssn->clean_out.used,
2622                        (sock->ssn->clean_out.data[2] << 8) | sock->ssn->clean_out.data[3]);
2623                 goto do_close;
2624         }
2625
2626         packet = sock->packet;
2627         packet->data = rad_malloc(sock->ssn->clean_out.used);
2628         packet->data_len = sock->ssn->clean_out.used;
2629         record_minus(&sock->ssn->clean_out, packet->data, packet->data_len);
2630         packet->vps = NULL;
2631         PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2632
2633         if (!rad_packet_ok(packet, 0)) {
2634                 RDEBUG("Received bad packet: %s", fr_strerror());
2635                 tls_socket_close(listener);
2636                 return 0;       /* do_close unlocks the mutex */
2637         }
2638
2639         /*
2640          *      Copied from src/lib/radius.c, rad_recv();
2641          */
2642         if (fr_debug_flag) {
2643                 char host_ipaddr[128];
2644
2645                 if ((packet->code > 0) && (packet->code < FR_MAX_PACKET_CODE)) {
2646                         RDEBUG("tls_recv: %s packet from host %s port %d, id=%d, length=%d",
2647                                fr_packet_codes[packet->code],
2648                                inet_ntop(packet->src_ipaddr.af,
2649                                          &packet->src_ipaddr.ipaddr,
2650                                          host_ipaddr, sizeof(host_ipaddr)),
2651                                packet->src_port,
2652                                packet->id, (int) packet->data_len);
2653                 } else {
2654                         RDEBUG("tls_recv: Packet from host %s port %d code=%d, id=%d, length=%d",
2655                                inet_ntop(packet->src_ipaddr.af,
2656                                          &packet->src_ipaddr.ipaddr,
2657                                          host_ipaddr, sizeof(host_ipaddr)),
2658                                packet->src_port,
2659                                packet->code,
2660                                packet->id, (int) packet->data_len);
2661                 }
2662         }
2663
2664         FR_STATS_INC(auth, total_requests);
2665
2666         return 1;
2667 }
2668
2669
2670 int dual_tls_recv(rad_listen_t *listener)
2671 {
2672         RADIUS_PACKET *packet;
2673         REQUEST *request;
2674         RAD_REQUEST_FUNP fun = NULL;
2675         listen_socket_t *sock = listener->data;
2676         RADCLIENT       *client = sock->client;
2677
2678         if (!tls_socket_recv(listener)) {
2679                 return 0;
2680         }
2681
2682         rad_assert(sock->request != NULL);
2683         rad_assert(sock->request->packet != NULL);
2684         rad_assert(sock->packet != NULL);
2685         rad_assert(sock->ssn != NULL);
2686
2687         request = sock->request;
2688         packet = sock->packet;
2689
2690         /*
2691          *      Some sanity checks, based on the packet code.
2692          */
2693         switch(packet->code) {
2694         case PW_AUTHENTICATION_REQUEST:
2695                 if (listener->type != RAD_LISTEN_AUTH) goto bad_packet;
2696                 FR_STATS_INC(auth, total_requests);
2697                 fun = rad_authenticate;
2698                 break;
2699
2700         case PW_ACCOUNTING_REQUEST:
2701                 if (listener->type != RAD_LISTEN_ACCT) goto bad_packet;
2702                 FR_STATS_INC(acct, total_requests);
2703                 fun = rad_accounting;
2704                 break;
2705
2706         case PW_STATUS_SERVER:
2707                 if (!mainconfig.status_server) {
2708                         FR_STATS_INC(auth, total_unknown_types);
2709                         DEBUG("WARNING: Ignoring Status-Server request due to security configuration");
2710                         rad_free(&sock->packet);
2711                         request->packet = NULL;
2712                         return 0;
2713                 }
2714                 fun = rad_status_server;
2715                 break;
2716
2717         default:
2718         bad_packet:
2719                 FR_STATS_INC(auth, total_unknown_types);
2720
2721                 DEBUG("Invalid packet code %d sent from client %s port %d : IGNORED",
2722                       packet->code, client->shortname, packet->src_port);
2723                 rad_free(&sock->packet);
2724                 request->packet = NULL;
2725                 return 0;
2726         } /* switch over packet types */
2727
2728         if (!request_receive(listener, packet, client, fun)) {
2729                 FR_STATS_INC(auth, total_packets_dropped);
2730                 rad_free(&sock->packet);
2731                 request->packet = NULL;
2732                 return 0;
2733         }
2734
2735         sock->packet = NULL;    /* we have no need for more partial reads */
2736         request->packet = NULL;
2737
2738         return 1;
2739 }
2740
2741
2742 /*
2743  *      Send a response packet
2744  */
2745 int dual_tls_send(rad_listen_t *listener, REQUEST *request)
2746 {
2747         listen_socket_t *sock = listener->data;
2748
2749         rad_assert(request->listener == listener);
2750         rad_assert(listener->send == dual_tls_send);
2751
2752         /*
2753          *      Accounting reject's are silently dropped.
2754          *
2755          *      We do it here to avoid polluting the rest of the
2756          *      code with this knowledge
2757          */
2758         if (request->reply->code == 0) return 0;
2759
2760         /*
2761          *      Pack the VPs
2762          */
2763         if (rad_encode(request->reply, request->packet,
2764                        request->client->secret) < 0) {
2765                 RDEBUG("Failed encoding packet: %s", fr_strerror());
2766                 return 0;
2767         }
2768
2769         /*
2770          *      Sign the packet.
2771          */
2772         if (rad_sign(request->reply, request->packet,
2773                        request->client->secret) < 0) {
2774                 RDEBUG("Failed signing packet: %s", fr_strerror());
2775                 return 0;
2776         }
2777
2778         PTHREAD_MUTEX_LOCK(&sock->mutex);
2779         /*
2780          *      Write the packet to the SSL buffers.
2781          */
2782         record_plus(&sock->ssn->clean_in,
2783                     request->reply->data, request->reply->data_len);
2784
2785         /*
2786          *      Do SSL magic to get encrypted data.
2787          */
2788         tls_handshake_send(request, sock->ssn);
2789
2790         /*
2791          *      And finally write the data to the socket.
2792          */
2793         if (sock->ssn->dirty_out.used > 0) {
2794                 dump_hex("WRITE TO SSL", sock->ssn->dirty_out.data, sock->ssn->dirty_out.used);
2795
2796                 tls_socket_write(listener, request);
2797         }
2798         PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2799
2800         return 0;
2801 }
2802
2803
2804 int proxy_tls_recv(rad_listen_t *listener)
2805 {
2806         int rcode;
2807         size_t length;
2808         listen_socket_t *sock = listener->data;
2809         char buffer[256];
2810         uint8_t data[1024];
2811         RADIUS_PACKET *packet;
2812         RAD_REQUEST_FUNP fun = NULL;
2813
2814         DEBUG3("Proxy SSL socket has data to read");
2815         PTHREAD_MUTEX_LOCK(&sock->mutex);
2816 redo:
2817         rcode = SSL_read(sock->ssn->ssl, data, 4);
2818         if (rcode <= 0) {
2819                 int err = SSL_get_error(sock->ssn->ssl, rcode);
2820                 switch (err) {
2821                 case SSL_ERROR_WANT_READ:
2822                 case SSL_ERROR_WANT_WRITE:
2823                         rcode = 0;
2824                         goto redo;
2825                 case SSL_ERROR_ZERO_RETURN:
2826                         /* remote end sent close_notify, send one back */
2827                         SSL_shutdown(sock->ssn->ssl);
2828
2829                 case SSL_ERROR_SYSCALL:
2830                 do_close:
2831                         PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2832                         tls_socket_close(listener);
2833                         return 0;
2834
2835                 default:
2836                         while ((err = ERR_get_error())) {
2837                                 DEBUG("proxy recv says %s",
2838                                       ERR_error_string(err, NULL));
2839                         }
2840
2841                         goto do_close;
2842                 }
2843         }
2844
2845         length = (data[2] << 8) | data[3];
2846         DEBUG3("Proxy received header saying we have a packet of %u bytes",
2847                (unsigned int) length);
2848
2849         if (length > sizeof(data)) {
2850                 DEBUG("Received packet will be too large! (%u)",
2851                       (data[2] << 8) | data[3]);
2852                 goto do_close;
2853         }
2854
2855         rcode = SSL_read(sock->ssn->ssl, data + 4, length);
2856         if (rcode <= 0) {
2857                 switch (SSL_get_error(sock->ssn->ssl, rcode)) {
2858                 case SSL_ERROR_WANT_READ:
2859                 case SSL_ERROR_WANT_WRITE:
2860                         rcode = 0;
2861                         break;
2862
2863                 case SSL_ERROR_ZERO_RETURN:
2864                         /* remote end sent close_notify, send one back */
2865                         SSL_shutdown(sock->ssn->ssl);
2866                         goto do_close;
2867                 default:
2868                         goto do_close;
2869                 }
2870         }
2871         PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2872
2873         packet = rad_alloc(0);
2874         packet->sockfd = listener->fd;
2875         packet->src_ipaddr = sock->other_ipaddr;
2876         packet->src_port = sock->other_port;
2877         packet->dst_ipaddr = sock->my_ipaddr;
2878         packet->dst_port = sock->my_port;
2879         packet->code = data[0];
2880         packet->id = data[1];
2881         packet->data_len = length;
2882         packet->data = rad_malloc(packet->data_len);
2883         memcpy(packet->data, data, packet->data_len);
2884         memcpy(packet->vector, packet->data + 4, 16);
2885
2886         /*
2887          *      FIXME: Client MIB updates?
2888          */
2889         switch(packet->code) {
2890         case PW_AUTHENTICATION_ACK:
2891         case PW_ACCESS_CHALLENGE:
2892         case PW_AUTHENTICATION_REJECT:
2893                 fun = rad_authenticate;
2894                 break;
2895
2896 #ifdef WITH_ACCOUNTING
2897         case PW_ACCOUNTING_RESPONSE:
2898                 fun = rad_accounting;
2899                 break;
2900 #endif
2901
2902         default:
2903                 /*
2904                  *      FIXME: Update MIB for packet types?
2905                  */
2906                 radlog(L_ERR, "Invalid packet code %d sent to a proxy port "
2907                        "from home server %s port %d - ID %d : IGNORED",
2908                        packet->code,
2909                        ip_ntoh(&packet->src_ipaddr, buffer, sizeof(buffer)),
2910                        packet->src_port, packet->id);
2911                 rad_free(&packet);
2912                 return 0;
2913         }
2914
2915         if (!request_proxy_reply(packet)) {
2916                 rad_free(&packet);
2917                 return 0;
2918         }
2919
2920         return 1;
2921 }
2922
2923 int proxy_tls_send(rad_listen_t *listener, REQUEST *request)
2924 {
2925         int rcode;
2926         listen_socket_t *sock = listener->data;
2927
2928         /*
2929          *      Normal proxying calls us with the data already
2930          *      encoded.  The "ping home server" code does not.  So,
2931          *      if there's no packet, encode it here.
2932          */
2933         if (!request->proxy->data) {
2934                 request->proxy_listener->encode(request->proxy_listener,
2935                                                 request);
2936         }
2937
2938         DEBUG3("Proxy is writing %u bytes to SSL",
2939                (unsigned int) request->proxy->data_len);
2940         PTHREAD_MUTEX_LOCK(&sock->mutex);
2941         while ((rcode = SSL_write(sock->ssn->ssl, request->proxy->data,
2942                                   request->proxy->data_len)) < 0) {
2943                 int err;
2944                 while ((err = ERR_get_error())) {
2945                         DEBUG("proxy SSL_write says %s",
2946                               ERR_error_string(err, NULL));
2947                 }
2948                 PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2949                 tls_socket_close(listener);
2950                 return 0;
2951         }
2952         PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2953
2954         return 1;
2955 }
2956
2957 #endif  /* WITH_TLS */