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         { "use_nonce", PW_TYPE_BOOLEAN,
 783           offsetof(fr_tls_server_conf_t, ocsp_use_nonce), NULL, "yes"},
 784         { "timeout", PW_TYPE_INTEGER,
 785           offsetof(fr_tls_server_conf_t, ocsp_timeout), NULL, "yes"},
 786         { "softfail", PW_TYPE_BOOLEAN,
 787           offsetof(fr_tls_server_conf_t, ocsp_softfail), NULL, "yes"},
 788         { NULL, -1, 0, NULL, NULL }           /* end the list */
 789 };
 790 #endif
 791
 792 static CONF_PARSER tls_server_config[] = {
 793         { "rsa_key_exchange", PW_TYPE_BOOLEAN,
 794           offsetof(fr_tls_server_conf_t, rsa_key), NULL, "no" },
 795         { "dh_key_exchange", PW_TYPE_BOOLEAN,
 796           offsetof(fr_tls_server_conf_t, dh_key), NULL, "yes" },
 797         { "rsa_key_length", PW_TYPE_INTEGER,
 798           offsetof(fr_tls_server_conf_t, rsa_key_length), NULL, "512" },
 799         { "dh_key_length", PW_TYPE_INTEGER,
 800           offsetof(fr_tls_server_conf_t, dh_key_length), NULL, "512" },
 801         { "verify_depth", PW_TYPE_INTEGER,
 802           offsetof(fr_tls_server_conf_t, verify_depth), NULL, "0" },
 803         { "CA_path", PW_TYPE_FILENAME,
 804           offsetof(fr_tls_server_conf_t, ca_path), NULL, NULL },
 805         { "pem_file_type", PW_TYPE_BOOLEAN,
 806           offsetof(fr_tls_server_conf_t, file_type), NULL, "yes" },
 807         { "private_key_file", PW_TYPE_FILENAME,
 808           offsetof(fr_tls_server_conf_t, private_key_file), NULL, NULL },
 809         { "certificate_file", PW_TYPE_FILENAME,
 810           offsetof(fr_tls_server_conf_t, certificate_file), NULL, NULL },
 811         { "CA_file", PW_TYPE_FILENAME,
 812           offsetof(fr_tls_server_conf_t, ca_file), NULL, NULL },
 813         { "private_key_password", PW_TYPE_STRING_PTR,
 814           offsetof(fr_tls_server_conf_t, private_key_password), NULL, NULL },
 815 #ifdef PSK_MAX_IDENTITY_LEN
 816         { "psk_identity", PW_TYPE_STRING_PTR,
 817           offsetof(fr_tls_server_conf_t, psk_identity), NULL, NULL },
 818         { "psk_hexphrase", PW_TYPE_STRING_PTR,
 819           offsetof(fr_tls_server_conf_t, psk_password), NULL, NULL },
 820 #endif
 821         { "dh_file", PW_TYPE_STRING_PTR,
 822           offsetof(fr_tls_server_conf_t, dh_file), NULL, NULL },
 823         { "random_file", PW_TYPE_STRING_PTR,
 824           offsetof(fr_tls_server_conf_t, random_file), NULL, NULL },
 825         { "fragment_size", PW_TYPE_INTEGER,
 826           offsetof(fr_tls_server_conf_t, fragment_size), NULL, "1024" },
 827         { "include_length", PW_TYPE_BOOLEAN,
 828           offsetof(fr_tls_server_conf_t, include_length), NULL, "yes" },
 829         { "check_crl", PW_TYPE_BOOLEAN,
 830           offsetof(fr_tls_server_conf_t, check_crl), NULL, "no"},
 831         { "allow_expired_crl", PW_TYPE_BOOLEAN,
 832           offsetof(fr_tls_server_conf_t, allow_expired_crl), NULL, NULL},
 833         { "check_cert_cn", PW_TYPE_STRING_PTR,
 834           offsetof(fr_tls_server_conf_t, check_cert_cn), NULL, NULL},
 835         { "cipher_list", PW_TYPE_STRING_PTR,
 836           offsetof(fr_tls_server_conf_t, cipher_list), NULL, NULL},
 837         { "check_cert_issuer", PW_TYPE_STRING_PTR,
 838           offsetof(fr_tls_server_conf_t, check_cert_issuer), NULL, NULL},
 839         { "make_cert_command", PW_TYPE_STRING_PTR,
 840           offsetof(fr_tls_server_conf_t, make_cert_command), NULL, NULL},
 841         { "require_client_cert", PW_TYPE_BOOLEAN,
 842           offsetof(fr_tls_server_conf_t, require_client_cert), NULL, NULL },
 843
 844 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
 845 #ifndef OPENSSL_NO_ECDH
 846         { "ecdh_curve", PW_TYPE_STRING_PTR,
 847           offsetof(fr_tls_server_conf_t, ecdh_curve), NULL, "prime256v1"},
 848 #endif
 849 #endif
 850
 851         { "cache", PW_TYPE_SUBSECTION, 0, NULL, (const void *) cache_config },
 852
 853         { "verify", PW_TYPE_SUBSECTION, 0, NULL, (const void *) verify_config },
 854
 855 #ifdef HAVE_OPENSSL_OCSP_H
 856         { "ocsp", PW_TYPE_SUBSECTION, 0, NULL, (const void *) ocsp_config },
 857 #endif
 858
 859         { NULL, -1, 0, NULL, NULL }           /* end the list */
 860 };
 861
 862
 863 static CONF_PARSER tls_client_config[] = {
 864         { "rsa_key_exchange", PW_TYPE_BOOLEAN,
 865           offsetof(fr_tls_server_conf_t, rsa_key), NULL, "no" },
 866         { "dh_key_exchange", PW_TYPE_BOOLEAN,
 867           offsetof(fr_tls_server_conf_t, dh_key), NULL, "yes" },
 868         { "rsa_key_length", PW_TYPE_INTEGER,
 869           offsetof(fr_tls_server_conf_t, rsa_key_length), NULL, "512" },
 870         { "dh_key_length", PW_TYPE_INTEGER,
 871           offsetof(fr_tls_server_conf_t, dh_key_length), NULL, "512" },
 872         { "verify_depth", PW_TYPE_INTEGER,
 873           offsetof(fr_tls_server_conf_t, verify_depth), NULL, "0" },
 874         { "CA_path", PW_TYPE_FILENAME,
 875           offsetof(fr_tls_server_conf_t, ca_path), NULL, NULL },
 876         { "pem_file_type", PW_TYPE_BOOLEAN,
 877           offsetof(fr_tls_server_conf_t, file_type), NULL, "yes" },
 878         { "private_key_file", PW_TYPE_FILENAME,
 879           offsetof(fr_tls_server_conf_t, private_key_file), NULL, NULL },
 880         { "certificate_file", PW_TYPE_FILENAME,
 881           offsetof(fr_tls_server_conf_t, certificate_file), NULL, NULL },
 882         { "CA_file", PW_TYPE_FILENAME,
 883           offsetof(fr_tls_server_conf_t, ca_file), NULL, NULL },
 884         { "private_key_password", PW_TYPE_STRING_PTR,
 885           offsetof(fr_tls_server_conf_t, private_key_password), NULL, NULL },
 886         { "dh_file", PW_TYPE_STRING_PTR,
 887           offsetof(fr_tls_server_conf_t, dh_file), NULL, NULL },
 888         { "random_file", PW_TYPE_STRING_PTR,
 889           offsetof(fr_tls_server_conf_t, random_file), NULL, NULL },
 890         { "fragment_size", PW_TYPE_INTEGER,
 891           offsetof(fr_tls_server_conf_t, fragment_size), NULL, "1024" },
 892         { "include_length", PW_TYPE_BOOLEAN,
 893           offsetof(fr_tls_server_conf_t, include_length), NULL, "yes" },
 894         { "check_crl", PW_TYPE_BOOLEAN,
 895           offsetof(fr_tls_server_conf_t, check_crl), NULL, "no"},
 896         { "check_cert_cn", PW_TYPE_STRING_PTR,
 897           offsetof(fr_tls_server_conf_t, check_cert_cn), NULL, NULL},
 898         { "cipher_list", PW_TYPE_STRING_PTR,
 899           offsetof(fr_tls_server_conf_t, cipher_list), NULL, NULL},
 900         { "check_cert_issuer", PW_TYPE_STRING_PTR,
 901           offsetof(fr_tls_server_conf_t, check_cert_issuer), NULL, NULL},
 902
 903 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
 904 #ifndef OPENSSL_NO_ECDH
 905         { "ecdh_curve", PW_TYPE_STRING_PTR,
 906           offsetof(fr_tls_server_conf_t, ecdh_curve), NULL, "prime256v1"},
 907 #endif
 908 #endif
 909
 910         { NULL, -1, 0, NULL, NULL }           /* end the list */
 911 };
 912
 913
 914 /*
 915  *      TODO: Check for the type of key exchange * like conf->dh_key
 916  */
 917 static int load_dh_params(SSL_CTX *ctx, char *file)
 918 {
 919         DH *dh = NULL;
 920         BIO *bio;
 921
 922         if ((bio = BIO_new_file(file, "r")) == NULL) {
 923                 radlog(L_ERR, "rlm_eap_tls: Unable to open DH file - %s", file);
 924                 return -1;
 925         }
 926
 927         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
 928         BIO_free(bio);
 929         if (!dh) {
 930                 DEBUG2("WARNING: rlm_eap_tls: Unable to set DH parameters.  DH cipher suites may not work!");
 931                 DEBUG2("WARNING: Fix this by running the OpenSSL command listed in eap.conf");
 932                 return 0;
 933         }
 934
 935         if (SSL_CTX_set_tmp_dh(ctx, dh) < 0) {
 936                 radlog(L_ERR, "rlm_eap_tls: Unable to set DH parameters");
 937                 DH_free(dh);
 938                 return -1;
 939         }
 940
 941         DH_free(dh);
 942         return 0;
 943 }
 944
 945
 946 /*
 947  *      Generate ephemeral RSA keys.
 948  */
 949 static int generate_eph_rsa_key(SSL_CTX *ctx)
 950 {
 951         RSA *rsa;
 952
 953         rsa = RSA_generate_key(512, RSA_F4, NULL, NULL);
 954
 955         if (!SSL_CTX_set_tmp_rsa(ctx, rsa)) {
 956                 radlog(L_ERR, "rlm_eap_tls: Couldn't set ephemeral RSA key");
 957                 return -1;
 958         }
 959
 960         RSA_free(rsa);
 961         return 0;
 962 }
 963
 964
 965 /*
 966  *      Print debugging messages, and free data.
 967  *
 968  *      FIXME: Write sessions to some long-term storage, so that
 969  *             session resumption can still occur after the server
 970  *             restarts.
 971  */
 972 #define MAX_SESSION_SIZE (256)
 973
 974 static void cbtls_remove_session(UNUSED SSL_CTX *ctx, SSL_SESSION *sess)
 975 {
 976         size_t size;
 977         char buffer[2 * MAX_SESSION_SIZE + 1];
 978
 979         size = sess->session_id_length;
 980         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
 981
 982         fr_bin2hex(sess->session_id, buffer, size);
 983
 984         DEBUG2("  SSL: Removing session %s from the cache", buffer);
 985
 986         return;
 987 }
 988
 989 static int cbtls_new_session(UNUSED SSL *s, SSL_SESSION *sess)
 990 {
 991         size_t size;
 992         char buffer[2 * MAX_SESSION_SIZE + 1];
 993
 994         size = sess->session_id_length;
 995         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
 996
 997         fr_bin2hex(sess->session_id, buffer, size);
 998
 999         DEBUG2("  SSL: adding session %s to cache", buffer);
1000
1001         return 0;
1002 }
1003
1004 static SSL_SESSION *cbtls_get_session(UNUSED SSL *s,
1005                                       unsigned char *data, int len,
1006                                       int *copy)
1007 {
1008         size_t size;
1009         char buffer[2 * MAX_SESSION_SIZE + 1];
1010
1011         size = len;
1012         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
1013
1014         fr_bin2hex(data, buffer, size);
1015
1016         DEBUG2("  SSL: Client requested nonexistent cached session %s",
1017                buffer);
1018
1019         *copy = 0;
1020         return NULL;
1021 }
1022
1023 #ifdef HAVE_OPENSSL_OCSP_H
1024 /*
1025  * This function extracts the OCSP Responder URL
1026  * from an existing x509 certificate.
1027  */
1028 static int ocsp_parse_cert_url(X509 *cert, char **phost, char **pport,
1029                                char **ppath, int *pssl)
1030 {
1031         int i;
1032
1033         AUTHORITY_INFO_ACCESS *aia;
1034         ACCESS_DESCRIPTION *ad;
1035
1036         aia = X509_get_ext_d2i(cert, NID_info_access, NULL, NULL);
1037
1038         for (i = 0; i < sk_ACCESS_DESCRIPTION_num(aia); i++) {
1039                 ad = sk_ACCESS_DESCRIPTION_value(aia, 0);
1040                 if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) {
1041                         if (ad->location->type == GEN_URI) {
1042                                 if(OCSP_parse_url(ad->location->d.ia5->data,
1043                                         phost, pport, ppath, pssl))
1044                                         return 1;
1045                         }
1046                 }
1047         }
1048         return 0;
1049 }
1050
1051 /*
1052  * This function sends a OCSP request to a defined OCSP responder
1053  * and checks the OCSP response for correctness.
1054  */
1055
1056 /* Maximum leeway in validity period: default 5 minutes */
1057 #define MAX_VALIDITY_PERIOD     (5 * 60)
1058
1059 static int ocsp_check(X509_STORE *store, X509 *issuer_cert, X509 *client_cert,
1060                       fr_tls_server_conf_t *conf)
1061 {
1062         OCSP_CERTID *certid;
1063         OCSP_REQUEST *req;
1064         OCSP_RESPONSE *resp = NULL;
1065         OCSP_BASICRESP *bresp = NULL;
1066         char *host = NULL;
1067         char *port = NULL;
1068         char *path = NULL;
1069         int use_ssl = -1;
1070         long nsec = MAX_VALIDITY_PERIOD, maxage = -1;
1071         BIO *cbio, *bio_out;
1072         int ocsp_ok = 0;
1073         int status ;
1074         ASN1_GENERALIZEDTIME *rev, *thisupd, *nextupd;
1075         int reason;
1076         OCSP_REQ_CTX *ctx;
1077         int rc;
1078         struct timeval now;
1079         struct timeval when;
1080
1081         /*
1082          * Create OCSP Request
1083          */
1084         certid = OCSP_cert_to_id(NULL, client_cert, issuer_cert);
1085         req = OCSP_REQUEST_new();
1086         OCSP_request_add0_id(req, certid);
1087         if(conf->ocsp_use_nonce) {
1088                 OCSP_request_add1_nonce(req, NULL, 8);
1089         }
1090
1091         /*
1092          * Send OCSP Request and get OCSP Response
1093          */
1094
1095         /* Get OCSP responder URL */
1096         if(conf->ocsp_override_url) {
1097                 OCSP_parse_url(conf->ocsp_url, &host, &port, &path, &use_ssl);
1098         }
1099         else {
1100                 ocsp_parse_cert_url(client_cert, &host, &port, &path, &use_ssl);
1101         }
1102
1103         DEBUG2("[ocsp] --> Responder URL = http://%s:%s%s", host, port, path);
1104
1105         /* Setup BIO socket to OCSP responder */
1106         cbio = BIO_new_connect(host);
1107
1108         bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
1109
1110         BIO_set_conn_port(cbio, port);
1111
1112         if (conf->ocsp_timeout)
1113                 BIO_set_nbio(cbio, 1);
1114
1115         rc = BIO_do_connect(cbio);
1116         if ((rc <= 0) && ((!conf->ocsp_timeout) || !BIO_should_retry(cbio))) {
1117                 radlog(L_ERR, "Error: Couldn't connect to OCSP responder");
1118                 ocsp_ok = 2;
1119                 goto ocsp_end;
1120         }
1121
1122         ctx = OCSP_sendreq_new(cbio, path, req, -1);
1123         if (!ctx) {
1124                 radlog(L_ERR, "Error: Couldn't send OCSP request");
1125                 ocsp_ok = 2;
1126                 goto ocsp_end;
1127         }
1128
1129         gettimeofday(&when, NULL);
1130         when.tv_sec += conf->ocsp_timeout;
1131
1132         do {
1133                 rc = OCSP_sendreq_nbio(&resp, ctx);
1134                 if (conf->ocsp_timeout) {
1135                         gettimeofday(&now, NULL);
1136                         if (!timercmp(&now, &when, <))
1137                                 break;
1138                 }
1139         } while ((rc == -1) && BIO_should_retry(cbio));
1140
1141         if (conf->ocsp_timeout && (rc == -1) && BIO_should_retry(cbio)) {
1142                 radlog(L_ERR, "Error: OCSP response timed out");
1143                 ocsp_ok = 2;
1144                 goto ocsp_end;
1145         }
1146
1147         OCSP_REQ_CTX_free(ctx);
1148
1149         if (rc == 0) {
1150                 radlog(L_ERR, "Error: Couldn't get OCSP response");
1151                 ocsp_ok = 2;
1152                 goto ocsp_end;
1153         }
1154
1155         /* Verify OCSP response status */
1156         status = OCSP_response_status(resp);
1157         DEBUG2("[ocsp] --> Response status: %s",OCSP_response_status_str(status));
1158         if(status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
1159                 radlog(L_ERR, "Error: OCSP response status: %s", OCSP_response_status_str(status));
1160                 goto ocsp_end;
1161         }
1162         bresp = OCSP_response_get1_basic(resp);
1163         if(conf->ocsp_use_nonce && OCSP_check_nonce(req, bresp)!=1) {
1164                 radlog(L_ERR, "Error: OCSP response has wrong nonce value");
1165                 goto ocsp_end;
1166         }
1167         if(OCSP_basic_verify(bresp, NULL, store, 0)!=1){
1168                 radlog(L_ERR, "Error: Couldn't verify OCSP basic response");
1169                 goto ocsp_end;
1170         }
1171
1172         /*      Verify OCSP cert status */
1173         if(!OCSP_resp_find_status(bresp, certid, &status, &reason,
1174                                                       &rev, &thisupd, &nextupd)) {
1175                 radlog(L_ERR, "ERROR: No Status found.\n");
1176                 goto ocsp_end;
1177         }
1178
1179         if (!OCSP_check_validity(thisupd, nextupd, nsec, maxage)) {
1180                 BIO_puts(bio_out, "WARNING: Status times invalid.\n");
1181                 ERR_print_errors(bio_out);
1182                 goto ocsp_end;
1183         }
1184         BIO_puts(bio_out, "\tThis Update: ");
1185         ASN1_GENERALIZEDTIME_print(bio_out, thisupd);
1186         BIO_puts(bio_out, "\n");
1187         BIO_puts(bio_out, "\tNext Update: ");
1188         ASN1_GENERALIZEDTIME_print(bio_out, nextupd);
1189         BIO_puts(bio_out, "\n");
1190
1191         switch (status) {
1192         case V_OCSP_CERTSTATUS_GOOD:
1193                 DEBUG2("[oscp] --> Cert status: good");
1194                 ocsp_ok = 1;
1195                 break;
1196
1197         default:
1198                 /* REVOKED / UNKNOWN */
1199                 DEBUG2("[ocsp] --> Cert status: %s",OCSP_cert_status_str(status));
1200                 if (reason != -1)
1201                         DEBUG2("[ocsp] --> Reason: %s", OCSP_crl_reason_str(reason));
1202                 BIO_puts(bio_out, "\tRevocation Time: ");
1203                 ASN1_GENERALIZEDTIME_print(bio_out, rev);
1204                 BIO_puts(bio_out, "\n");
1205                 break;
1206         }
1207
1208 ocsp_end:
1209         /* Free OCSP Stuff */
1210         OCSP_REQUEST_free(req);
1211         OCSP_RESPONSE_free(resp);
1212         free(host);
1213         free(port);
1214         free(path);
1215         BIO_free_all(cbio);
1216         OCSP_BASICRESP_free(bresp);
1217
1218         switch (ocsp_ok) {
1219         case 1:
1220                 DEBUG2("[ocsp] --> Certificate is valid!");
1221                 break;
1222         case 2:
1223                 if (conf->ocsp_softfail) {
1224                         DEBUG2("[ocsp] --> Unable to check certificate; assuming valid.");
1225                         DEBUG2("[ocsp] --> Warning! This may be insecure.");
1226                         ocsp_ok = 1;
1227                 } else {
1228                         DEBUG2("[ocsp] --> Unable to check certificate; failing!");
1229                         ocsp_ok = 0;
1230                 }
1231                 break;
1232         default:
1233                 DEBUG2("[ocsp] --> Certificate has been expired/revoked!");
1234                 break;
1235         }
1236
1237         return ocsp_ok;
1238 }
1239 #endif  /* HAVE_OPENSSL_OCSP_H */
1240
1241 /*
1242  *      For creating certificate attributes.
1243  */
1244 static const char *cert_attr_names[6][2] = {
1245   { "TLS-Client-Cert-Serial",           "TLS-Cert-Serial" },
1246   { "TLS-Client-Cert-Expiration",       "TLS-Cert-Expiration" },
1247   { "TLS-Client-Cert-Subject",          "TLS-Cert-Subject" },
1248   { "TLS-Client-Cert-Issuer",           "TLS-Cert-Issuer" },
1249   { "TLS-Client-Cert-Common-Name",      "TLS-Cert-Common-Name" },
1250   { "TLS-Client-Cert-Subject-Alt-Name-Email",   "TLS-Cert-Subject-Alt-Name-Email" }
1251 };
1252
1253 #define FR_TLS_SERIAL           (0)
1254 #define FR_TLS_EXPIRATION       (1)
1255 #define FR_TLS_SUBJECT          (2)
1256 #define FR_TLS_ISSUER           (3)
1257 #define FR_TLS_CN               (4)
1258 #define FR_TLS_SAN_EMAIL        (5)
1259
1260 /*
1261  *      Before trusting a certificate, you must make sure that the
1262  *      certificate is 'valid'. There are several steps that your
1263  *      application can take in determining if a certificate is
1264  *      valid. Commonly used steps are:
1265  *
1266  *      1.Verifying the certificate's signature, and verifying that
1267  *      the certificate has been issued by a trusted Certificate
1268  *      Authority.
1269  *
1270  *      2.Verifying that the certificate is valid for the present date
1271  *      (i.e. it is being presented within its validity dates).
1272  *
1273  *      3.Verifying that the certificate has not been revoked by its
1274  *      issuing Certificate Authority, by checking with respect to a
1275  *      Certificate Revocation List (CRL).
1276  *
1277  *      4.Verifying that the credentials presented by the certificate
1278  *      fulfill additional requirements specific to the application,
1279  *      such as with respect to access control lists or with respect
1280  *      to OCSP (Online Certificate Status Processing).
1281  *
1282  *      NOTE: This callback will be called multiple times based on the
1283  *      depth of the root certificate chain
1284  */
1285 int cbtls_verify(int ok, X509_STORE_CTX *ctx)
1286 {
1287         char subject[1024]; /* Used for the subject name */
1288         char issuer[1024]; /* Used for the issuer name */
1289         char common_name[1024];
1290         char cn_str[1024];
1291         char buf[64];
1292         X509 *client_cert;
1293         SSL *ssl;
1294         int err, depth, lookup, loc;
1295         fr_tls_server_conf_t *conf;
1296         int my_ok = ok;
1297         REQUEST *request;
1298         ASN1_INTEGER *sn = NULL;
1299         ASN1_TIME *asn_time = NULL;
1300         VALUE_PAIR **certs;
1301         char **identity;
1302 #ifdef HAVE_OPENSSL_OCSP_H
1303         X509_STORE *ocsp_store = NULL;
1304         X509 *issuer_cert;
1305 #endif
1306
1307         client_cert = X509_STORE_CTX_get_current_cert(ctx);
1308         err = X509_STORE_CTX_get_error(ctx);
1309         depth = X509_STORE_CTX_get_error_depth(ctx);
1310
1311         lookup = depth;
1312
1313         /*
1314          *      Log client/issuing cert.  If there's an error, log
1315          *      issuing cert.
1316          */
1317         if ((lookup > 1) && !my_ok) lookup = 1;
1318
1319         /*
1320          * Retrieve the pointer to the SSL of the connection currently treated
1321          * and the application specific data stored into the SSL object.
1322          */
1323         ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
1324         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1325         if (!conf) return 1;
1326
1327         request = (REQUEST *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
1328
1329         if (!request) return 1; /* FIXME: outbound TLS */
1330
1331         rad_assert(request != NULL);
1332         certs = (VALUE_PAIR **)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CERTS);
1333         rad_assert(certs != NULL);
1334         identity = (char **)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_IDENTITY);
1335 #ifdef HAVE_OPENSSL_OCSP_H
1336         ocsp_store = (X509_STORE *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_STORE);
1337 #endif
1338
1339
1340         /*
1341          *      Get the Serial Number
1342          */
1343         buf[0] = '\0';
1344         sn = X509_get_serialNumber(client_cert);
1345
1346         /*
1347          *      For this next bit, we create the attributes *only* if
1348          *      we're at the client or issuing certificate, AND we
1349          *      have a user identity.  i.e. we don't create the
1350          *      attributes for RadSec connections.
1351          */
1352         if (identity &&
1353             (lookup <= 1) && sn && ((size_t) sn->length < (sizeof(buf) / 2))) {
1354                 char *p = buf;
1355                 int i;
1356
1357                 for (i = 0; i < sn->length; i++) {
1358                         sprintf(p, "%02x", (unsigned int)sn->data[i]);
1359                         p += 2;
1360                 }
1361                 pairadd(certs,
1362                         pairmake(cert_attr_names[FR_TLS_SERIAL][lookup], buf, T_OP_SET));
1363         }
1364
1365
1366         /*
1367          *      Get the Expiration Date
1368          */
1369         buf[0] = '\0';
1370         asn_time = X509_get_notAfter(client_cert);
1371         if (identity && (lookup <= 1) && asn_time &&
1372             (asn_time->length < MAX_STRING_LEN)) {
1373                 memcpy(buf, (char*) asn_time->data, asn_time->length);
1374                 buf[asn_time->length] = '\0';
1375                 pairadd(certs,
1376                         pairmake(cert_attr_names[FR_TLS_EXPIRATION][lookup], buf, T_OP_SET));
1377         }
1378
1379         /*
1380          *      Get the Subject & Issuer
1381          */
1382         subject[0] = issuer[0] = '\0';
1383         X509_NAME_oneline(X509_get_subject_name(client_cert), subject,
1384                           sizeof(subject));
1385         subject[sizeof(subject) - 1] = '\0';
1386         if (identity && (lookup <= 1) && subject[0] &&
1387             (strlen(subject) < MAX_STRING_LEN)) {
1388                 pairadd(certs,
1389                         pairmake(cert_attr_names[FR_TLS_SUBJECT][lookup], subject, T_OP_SET));
1390         }
1391
1392         X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), issuer,
1393                           sizeof(issuer));
1394         issuer[sizeof(issuer) - 1] = '\0';
1395         if (identity && (lookup <= 1) && issuer[0] &&
1396             (strlen(issuer) < MAX_STRING_LEN)) {
1397                 pairadd(certs,
1398                         pairmake(cert_attr_names[FR_TLS_ISSUER][lookup], issuer, T_OP_SET));
1399         }
1400
1401         /*
1402          *      Get the Common Name
1403          */
1404         X509_NAME_get_text_by_NID(X509_get_subject_name(client_cert),
1405                                   NID_commonName, common_name, sizeof(common_name));
1406         common_name[sizeof(common_name) - 1] = '\0';
1407         if (identity && (lookup <= 1) && common_name[0] &&
1408             (strlen(common_name) < MAX_STRING_LEN)) {
1409                 pairadd(certs,
1410                         pairmake(cert_attr_names[FR_TLS_CN][lookup], common_name, T_OP_SET));
1411         }
1412
1413 #ifdef GEN_EMAIL
1414         /*
1415          *      Get the RFC822 Subject Alternative Name
1416          */
1417         loc = X509_get_ext_by_NID(client_cert, NID_subject_alt_name, 0);
1418         if (lookup <= 1 && loc >= 0) {
1419                 X509_EXTENSION *ext = NULL;
1420                 GENERAL_NAMES *names = NULL;
1421                 int i;
1422
1423                 if ((ext = X509_get_ext(client_cert, loc)) &&
1424                     (names = X509V3_EXT_d2i(ext))) {
1425                         for (i = 0; i < sk_GENERAL_NAME_num(names); i++) {
1426                                 GENERAL_NAME *name = sk_GENERAL_NAME_value(names, i);
1427
1428                                 switch (name->type) {
1429                                 case GEN_EMAIL:
1430                                         if (ASN1_STRING_length(name->d.rfc822Name) >= MAX_STRING_LEN)
1431                                                 break;
1432
1433                                         pairadd(certs,
1434                                                 pairmake(cert_attr_names[FR_TLS_SAN_EMAIL][lookup],
1435                                                          ASN1_STRING_data(name->d.rfc822Name), T_OP_SET));
1436                                         break;
1437                                 default:
1438                                         /* XXX TODO handle other SAN types */
1439                                         break;
1440                                 }
1441                         }
1442                 }
1443                 if (names != NULL)
1444                         sk_GENERAL_NAME_free(names);
1445         }
1446 #endif  /* GEN_EMAIL */
1447
1448         /*
1449          *      If the CRL has expired, that might still be OK.
1450          */
1451         if (!my_ok &&
1452             (conf->allow_expired_crl) &&
1453             (err == X509_V_ERR_CRL_HAS_EXPIRED)) {
1454                 my_ok = 1;
1455                 X509_STORE_CTX_set_error( ctx, 0 );
1456         }
1457
1458         if (!my_ok) {
1459                 const char *p = X509_verify_cert_error_string(err);
1460                 radlog(L_ERR,"--> verify error:num=%d:%s\n",err, p);
1461                 radius_pairmake(request, &request->packet->vps,
1462                                 "Module-Failure-Message", p, T_OP_SET);
1463                 return my_ok;
1464         }
1465
1466         switch (ctx->error) {
1467
1468         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
1469                 radlog(L_ERR, "issuer= %s\n", issuer);
1470                 break;
1471         case X509_V_ERR_CERT_NOT_YET_VALID:
1472         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
1473                 radlog(L_ERR, "notBefore=");
1474 #if 0
1475                 ASN1_TIME_print(bio_err, X509_get_notBefore(ctx->current_cert));
1476 #endif
1477                 break;
1478         case X509_V_ERR_CERT_HAS_EXPIRED:
1479         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
1480                 radlog(L_ERR, "notAfter=");
1481 #if 0
1482                 ASN1_TIME_print(bio_err, X509_get_notAfter(ctx->current_cert));
1483 #endif
1484                 break;
1485         }
1486
1487         /*
1488          *      If we're at the actual client cert, apply additional
1489          *      checks.
1490          */
1491         if (depth == 0) {
1492                 /*
1493                  *      If the conf tells us to, check cert issuer
1494                  *      against the specified value and fail
1495                  *      verification if they don't match.
1496                  */
1497                 if (conf->check_cert_issuer &&
1498                     (strcmp(issuer, conf->check_cert_issuer) != 0)) {
1499                         radlog(L_AUTH, "rlm_eap_tls: Certificate issuer (%s) does not match specified value (%s)!", issuer, conf->check_cert_issuer);
1500                         my_ok = 0;
1501                 }
1502
1503                 /*
1504                  *      If the conf tells us to, check the CN in the
1505                  *      cert against xlat'ed value, but only if the
1506                  *      previous checks passed.
1507                  */
1508                 if (my_ok && conf->check_cert_cn) {
1509                         if (!radius_xlat(cn_str, sizeof(cn_str), conf->check_cert_cn, request, NULL)) {
1510                                 radlog(L_ERR, "rlm_eap_tls (%s): xlat failed.",
1511                                        conf->check_cert_cn);
1512                                 /* if this fails, fail the verification */
1513                                 my_ok = 0;
1514                         } else {
1515                                 RDEBUG2("checking certificate CN (%s) with xlat'ed value (%s)", common_name, cn_str);
1516                                 if (strcmp(cn_str, common_name) != 0) {
1517                                         radlog(L_AUTH, "rlm_eap_tls: Certificate CN (%s) does not match specified value (%s)!", common_name, cn_str);
1518                                         my_ok = 0;
1519                                 }
1520                         }
1521                 } /* check_cert_cn */
1522
1523 #ifdef HAVE_OPENSSL_OCSP_H
1524                 if (my_ok && conf->ocsp_enable){
1525                         RDEBUG2("--> Starting OCSP Request");
1526                         if(X509_STORE_CTX_get1_issuer(&issuer_cert, ctx, client_cert)!=1) {
1527                                 radlog(L_ERR, "Error: Couldn't get issuer_cert for %s", common_name);
1528                         }
1529                         my_ok = ocsp_check(ocsp_store, issuer_cert, client_cert, conf);
1530                 }
1531 #endif
1532
1533                 while (conf->verify_client_cert_cmd) {
1534                         char filename[256];
1535                         int fd;
1536                         FILE *fp;
1537
1538                         snprintf(filename, sizeof(filename), "%s/%s.client.XXXXXXXX",
1539                                  conf->verify_tmp_dir, progname);
1540                         fd = mkstemp(filename);
1541                         if (fd < 0) {
1542                                 RDEBUG("Failed creating file in %s: %s",
1543                                        conf->verify_tmp_dir, strerror(errno));
1544                                 break;
1545                         }
1546
1547                         fp = fdopen(fd, "w");
1548                         if (!fp) {
1549                                 RDEBUG("Failed opening file %s: %s",
1550                                        filename, strerror(errno));
1551                                 break;
1552                         }
1553
1554                         if (!PEM_write_X509(fp, client_cert)) {
1555                                 fclose(fp);
1556                                 RDEBUG("Failed writing certificate to file");
1557                                 goto do_unlink;
1558                         }
1559                         fclose(fp);
1560
1561                         if (!radius_pairmake(request, &request->packet->vps,
1562                                              "TLS-Client-Cert-Filename",
1563                                              filename, T_OP_SET)) {
1564                                 RDEBUG("Failed creating TLS-Client-Cert-Filename");
1565
1566                                 goto do_unlink;
1567                         }
1568
1569                         RDEBUG("Verifying client certificate: %s",
1570                                conf->verify_client_cert_cmd);
1571                         if (radius_exec_program(conf->verify_client_cert_cmd,
1572                                                 request, 1, NULL, 0,
1573                                                 request->packet->vps,
1574                                                 NULL, 1) != 0) {
1575                                 radlog(L_AUTH, "rlm_eap_tls: Certificate CN (%s) fails external verification!", common_name);
1576                                 my_ok = 0;
1577                         } else {
1578                                 RDEBUG("Client certificate CN %s passed external validation", common_name);
1579                         }
1580
1581                 do_unlink:
1582                         unlink(filename);
1583                         break;
1584                 }
1585
1586
1587         } /* depth == 0 */
1588
1589         if (debug_flag > 0) {
1590                 RDEBUG2("chain-depth=%d, ", depth);
1591                 RDEBUG2("error=%d", err);
1592
1593                 if (identity) RDEBUG2("--> User-Name = %s", *identity);
1594                 RDEBUG2("--> BUF-Name = %s", common_name);
1595                 RDEBUG2("--> subject = %s", subject);
1596                 RDEBUG2("--> issuer  = %s", issuer);
1597                 RDEBUG2("--> verify return:%d", my_ok);
1598         }
1599         return my_ok;
1600 }
1601
1602
1603 #ifdef HAVE_OPENSSL_OCSP_H
1604 /*
1605  *      Create Global X509 revocation store and use it to verify
1606  *      OCSP responses
1607  *
1608  *      - Load the trusted CAs
1609  *      - Load the trusted issuer certificates
1610  */
1611 static X509_STORE *init_revocation_store(fr_tls_server_conf_t *conf)
1612 {
1613         X509_STORE *store = NULL;
1614
1615         store = X509_STORE_new();
1616
1617         /* Load the CAs we trust */
1618         if (conf->ca_file || conf->ca_path)
1619                 if(!X509_STORE_load_locations(store, conf->ca_file, conf->ca_path)) {
1620                         radlog(L_ERR, "rlm_eap: X509_STORE error %s", ERR_error_string(ERR_get_error(), NULL));
1621                         radlog(L_ERR, "rlm_eap_tls: Error reading Trusted root CA list %s",conf->ca_file );
1622                         return NULL;
1623                 }
1624
1625 #ifdef X509_V_FLAG_CRL_CHECK
1626         if (conf->check_crl)
1627                 X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK);
1628 #endif
1629         return store;
1630 }
1631 #endif  /* HAVE_OPENSSL_OCSP_H */
1632
1633 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
1634 #ifndef OPENSSL_NO_ECDH
1635 static int set_ecdh_curve(SSL_CTX *ctx, const char *ecdh_curve)
1636 {
1637         int      nid;
1638         EC_KEY  *ecdh;
1639
1640         if (!ecdh_curve || !*ecdh_curve) return 0;
1641
1642         nid = OBJ_sn2nid(ecdh_curve);
1643         if (!nid) {
1644                 radlog(L_ERR, "Unknown ecdh_curve \"%s\"", ecdh_curve);
1645                 return -1;
1646         }
1647
1648         ecdh = EC_KEY_new_by_curve_name(nid);
1649         if (!ecdh) {
1650                 radlog(L_ERR, "Unable to create new curve \"%s\"", ecdh_curve);
1651                 return -1;
1652         }
1653
1654         SSL_CTX_set_tmp_ecdh(ctx, ecdh);
1655
1656         SSL_CTX_set_options(ctx, SSL_OP_SINGLE_ECDH_USE);
1657
1658         EC_KEY_free(ecdh);
1659
1660         return 0;
1661 }
1662 #endif
1663 #endif
1664
1665 /* index we use to store cached session VPs
1666  * needs to be dynamic so we can supply a "free" function
1667  */
1668 static int FR_TLS_EX_INDEX_VPS = -1;
1669
1670 /*
1671  * DIE OPENSSL DIE DIE DIE
1672  *
1673  * What a palaver, just to free some data attached the
1674  * session. We need to do this because the "remove" callback
1675  * is called when refcount > 0 sometimes, if another thread
1676  * is using the session
1677  */
1678 static void sess_free_vps(UNUSED void *parent, void *data_ptr,
1679                                 UNUSED CRYPTO_EX_DATA *ad, UNUSED int idx,
1680                                 UNUSED long argl, UNUSED void *argp)
1681 {
1682         VALUE_PAIR *vp = data_ptr;
1683         if (!vp) return;
1684
1685         DEBUG2("  Freeing cached session VPs %p", vp);
1686
1687         pairfree(&vp);
1688 }
1689
1690
1691 /*
1692  *      Create Global context SSL and use it in every new session
1693  *
1694  *      - Load the trusted CAs
1695  *      - Load the Private key & the certificate
1696  *      - Set the Context options & Verify options
1697  */
1698 static SSL_CTX *init_tls_ctx(fr_tls_server_conf_t *conf, int client)
1699 {
1700         const SSL_METHOD *meth;
1701         SSL_CTX *ctx;
1702         X509_STORE *certstore;
1703         int verify_mode = SSL_VERIFY_NONE;
1704         int ctx_options = 0;
1705         int type;
1706
1707         /*
1708          *      Add all the default ciphers and message digests
1709          *      Create our context.
1710          */
1711         SSL_library_init();
1712         SSL_load_error_strings();
1713
1714         /*
1715          *      SHA256 is in all versions of OpenSSL, but isn't
1716          *      initialized by default.  It's needed for WiMAX
1717          *      certificates.
1718          */
1719 #ifdef HAVE_OPENSSL_EVP_SHA256
1720         EVP_add_digest(EVP_sha256());
1721 #endif
1722
1723         meth = TLSv1_method();
1724         ctx = SSL_CTX_new(meth);
1725
1726         /*
1727          * Identify the type of certificates that needs to be loaded
1728          */
1729         if (conf->file_type) {
1730                 type = SSL_FILETYPE_PEM;
1731         } else {
1732                 type = SSL_FILETYPE_ASN1;
1733         }
1734
1735         /*
1736          * Set the password to load private key
1737          */
1738         if (conf->private_key_password) {
1739 #ifdef __APPLE__
1740                 /*
1741                  * We don't want to put the private key password in eap.conf, so  check
1742                  * for our special string which indicates we should get the password
1743                  * programmatically.
1744                  */
1745                 const char* special_string = "Apple:UseCertAdmin";
1746                 if (strncmp(conf->private_key_password,
1747                                         special_string,
1748                                         strlen(special_string)) == 0)
1749                 {
1750                         char cmd[256];
1751                         const long max_password_len = 128;
1752                         snprintf(cmd, sizeof(cmd) - 1,
1753                                          "/usr/sbin/certadmin --get-private-key-passphrase \"%s\"",
1754                                          conf->private_key_file);
1755
1756                         DEBUG2("rlm_eap: Getting private key passphrase using command \"%s\"", cmd);
1757
1758                         FILE* cmd_pipe = popen(cmd, "r");
1759                         if (!cmd_pipe) {
1760                                 radlog(L_ERR, "rlm_eap: %s command failed.      Unable to get private_key_password", cmd);
1761                                 radlog(L_ERR, "rlm_eap: Error reading private_key_file %s", conf->private_key_file);
1762                                 return NULL;
1763                         }
1764
1765                         free(conf->private_key_password);
1766                         conf->private_key_password = malloc(max_password_len * sizeof(char));
1767                         if (!conf->private_key_password) {
1768                                 radlog(L_ERR, "rlm_eap: Can't malloc space for private_key_password");
1769                                 radlog(L_ERR, "rlm_eap: Error reading private_key_file %s", conf->private_key_file);
1770                                 pclose(cmd_pipe);
1771                                 return NULL;
1772                         }
1773
1774                         fgets(conf->private_key_password, max_password_len, cmd_pipe);
1775                         pclose(cmd_pipe);
1776
1777                         /* Get rid of newline at end of password. */
1778                         conf->private_key_password[strlen(conf->private_key_password) - 1] = '\0';
1779                         DEBUG2("rlm_eap:  Password from command = \"%s\"", conf->private_key_password);
1780                 }
1781 #endif
1782                 SSL_CTX_set_default_passwd_cb_userdata(ctx, conf->private_key_password);
1783                 SSL_CTX_set_default_passwd_cb(ctx, cbtls_password);
1784         }
1785
1786 #ifdef PSK_MAX_IDENTITY_LEN
1787         if ((conf->psk_identity && !conf->psk_password) ||
1788             (!conf->psk_identity && conf->psk_password) ||
1789             (conf->psk_identity && !*conf->psk_identity) ||
1790             (conf->psk_password && !*conf->psk_password)) {
1791                 radlog(L_ERR, "Invalid PSK Configuration: psk_identity or psk_password are empty");
1792                 return NULL;
1793         }
1794
1795         if (conf->psk_identity) {
1796                 size_t psk_len, hex_len;
1797                 char buffer[PSK_MAX_PSK_LEN];
1798
1799                 if (conf->certificate_file ||
1800                     conf->private_key_password || conf->private_key_file ||
1801                     conf->ca_file || conf->ca_path) {
1802                         radlog(L_ERR, "When PSKs are used, No certificate configuration is permitted");
1803                         return NULL;
1804                 }
1805
1806                 if (client) {
1807                         SSL_CTX_set_psk_client_callback(ctx,
1808                                                         psk_client_callback);
1809                 } else {
1810                         SSL_CTX_set_psk_server_callback(ctx,
1811                                                         psk_server_callback);
1812                 }
1813
1814                 psk_len = strlen(conf->psk_password);
1815                 if (strlen(conf->psk_password) > (2 * PSK_MAX_PSK_LEN)) {
1816                         radlog(L_ERR, "psk_hexphrase is too long (max %d)",
1817                                PSK_MAX_PSK_LEN);
1818                         return NULL;
1819                 }
1820
1821                 hex_len = fr_hex2bin(conf->psk_password, buffer, psk_len);
1822                 if (psk_len != (2 * hex_len)) {
1823                         radlog(L_ERR, "psk_hexphrase is not all hex");
1824                         return NULL;
1825                 }
1826
1827                 goto post_ca;
1828         }
1829 #endif
1830
1831         /*
1832          *      Load our keys and certificates
1833          *
1834          *      If certificates are of type PEM then we can make use
1835          *      of cert chain authentication using openssl api call
1836          *      SSL_CTX_use_certificate_chain_file.  Please see how
1837          *      the cert chain needs to be given in PEM from
1838          *      openSSL.org
1839          */
1840         if (!conf->certificate_file) goto load_ca;
1841
1842         if (type == SSL_FILETYPE_PEM) {
1843                 if (!(SSL_CTX_use_certificate_chain_file(ctx, conf->certificate_file))) {
1844                         radlog(L_ERR, "Error reading certificate file %s:%s",
1845                                conf->certificate_file,
1846                                ERR_error_string(ERR_get_error(), NULL));
1847                         return NULL;
1848                 }
1849
1850         } else if (!(SSL_CTX_use_certificate_file(ctx, conf->certificate_file, type))) {
1851                 radlog(L_ERR, "Error reading certificate file %s:%s",
1852                        conf->certificate_file,
1853                        ERR_error_string(ERR_get_error(), NULL));
1854                 return NULL;
1855         }
1856
1857         /* Load the CAs we trust */
1858 load_ca:
1859         if (conf->ca_file || conf->ca_path) {
1860                 if (!SSL_CTX_load_verify_locations(ctx, conf->ca_file, conf->ca_path)) {
1861                         radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
1862                         radlog(L_ERR, "rlm_eap_tls: Error reading Trusted root CA list %s",conf->ca_file );
1863                         return NULL;
1864                 }
1865         }
1866         if (conf->ca_file && *conf->ca_file) SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(conf->ca_file));
1867
1868         if (conf->private_key_file) {
1869                 if (!(SSL_CTX_use_PrivateKey_file(ctx, conf->private_key_file, type))) {
1870                         radlog(L_ERR, "Failed reading private key file %s:%s",
1871                                conf->private_key_file,
1872                                ERR_error_string(ERR_get_error(), NULL));
1873                         return NULL;
1874                 }
1875
1876                 /*
1877                  * Check if the loaded private key is the right one
1878                  */
1879                 if (!SSL_CTX_check_private_key(ctx)) {
1880                         radlog(L_ERR, "Private key does not match the certificate public key");
1881                         return NULL;
1882                 }
1883         }
1884
1885 #ifdef PSK_MAX_IDENTITY_LEN
1886 post_ca:
1887 #endif
1888
1889         /*
1890          *      Set ctx_options
1891          */
1892         ctx_options |= SSL_OP_NO_SSLv2;
1893         ctx_options |= SSL_OP_NO_SSLv3;
1894 #ifdef SSL_OP_NO_TICKET
1895         ctx_options |= SSL_OP_NO_TICKET ;
1896 #endif
1897
1898         /*
1899          *      SSL_OP_SINGLE_DH_USE must be used in order to prevent
1900          *      small subgroup attacks and forward secrecy. Always
1901          *      using
1902          *
1903          *      SSL_OP_SINGLE_DH_USE has an impact on the computer
1904          *      time needed during negotiation, but it is not very
1905          *      large.
1906          */
1907         ctx_options |= SSL_OP_SINGLE_DH_USE;
1908
1909         /*
1910          *      SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS to work around issues
1911          *      in Windows Vista client.
1912          *      http://www.openssl.org/~bodo/tls-cbc.txt
1913          *      http://www.nabble.com/(RADIATOR)-Radiator-Version-3.16-released-t2600070.html
1914          */
1915         ctx_options |= SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
1916
1917         SSL_CTX_set_options(ctx, ctx_options);
1918
1919         /*
1920          *      TODO: Set the RSA & DH
1921          *      SSL_CTX_set_tmp_rsa_callback(ctx, cbtls_rsa);
1922          *      SSL_CTX_set_tmp_dh_callback(ctx, cbtls_dh);
1923          */
1924
1925         /*
1926          *      set the message callback to identify the type of
1927          *      message.  For every new session, there can be a
1928          *      different callback argument.
1929          *
1930          *      SSL_CTX_set_msg_callback(ctx, cbtls_msg);
1931          */
1932
1933         /*
1934          *      Set eliptical curve crypto configuration.
1935          */
1936 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
1937 #ifndef OPENSSL_NO_ECDH
1938         if (set_ecdh_curve(ctx, conf->ecdh_curve) < 0) {
1939                 return NULL;
1940         }
1941 #endif
1942 #endif
1943
1944         /* Set Info callback */
1945         SSL_CTX_set_info_callback(ctx, cbtls_info);
1946
1947         /*
1948          *      Callbacks, etc. for session resumption.
1949          */
1950         if (conf->session_cache_enable) {
1951                 SSL_CTX_sess_set_new_cb(ctx, cbtls_new_session);
1952                 SSL_CTX_sess_set_get_cb(ctx, cbtls_get_session);
1953                 SSL_CTX_sess_set_remove_cb(ctx, cbtls_remove_session);
1954
1955                 SSL_CTX_set_quiet_shutdown(ctx, 1);
1956                 if (FR_TLS_EX_INDEX_VPS < 0)
1957                         FR_TLS_EX_INDEX_VPS = SSL_SESSION_get_ex_new_index(0, NULL, NULL, NULL, sess_free_vps);
1958         }
1959
1960         /*
1961          *      Check the certificates for revocation.
1962          */
1963 #ifdef X509_V_FLAG_CRL_CHECK
1964         if (conf->check_crl) {
1965           certstore = SSL_CTX_get_cert_store(ctx);
1966           if (certstore == NULL) {
1967             radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
1968             radlog(L_ERR, "rlm_eap_tls: Error reading Certificate Store");
1969             return NULL;
1970           }
1971           X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK);
1972         }
1973 #endif
1974
1975         /*
1976          *      Set verify modes
1977          *      Always verify the peer certificate
1978          */
1979         verify_mode |= SSL_VERIFY_PEER;
1980         verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
1981         verify_mode |= SSL_VERIFY_CLIENT_ONCE;
1982         SSL_CTX_set_verify(ctx, verify_mode, cbtls_verify);
1983
1984         if (conf->verify_depth) {
1985                 SSL_CTX_set_verify_depth(ctx, conf->verify_depth);
1986         }
1987
1988         /* Load randomness */
1989         if (!(RAND_load_file(conf->random_file, 1024*1024))) {
1990                 radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
1991                 radlog(L_ERR, "rlm_eap_tls: Error loading randomness");
1992                 return NULL;
1993         }
1994
1995         /*
1996          * Set the cipher list if we were told to
1997          */
1998         if (conf->cipher_list) {
1999                 if (!SSL_CTX_set_cipher_list(ctx, conf->cipher_list)) {
2000                         radlog(L_ERR, "rlm_eap_tls: Error setting cipher list");
2001                         return NULL;
2002                 }
2003         }
2004
2005         /*
2006          *      Setup session caching
2007          */
2008         if (conf->session_cache_enable) {
2009                 /*
2010                  *      Create a unique context Id per EAP-TLS configuration.
2011                  */
2012                 if (conf->session_id_name) {
2013                         snprintf(conf->session_context_id,
2014                                  sizeof(conf->session_context_id),
2015                                  "FR eap %s",
2016                                  conf->session_id_name);
2017                 } else {
2018                         snprintf(conf->session_context_id,
2019                                  sizeof(conf->session_context_id),
2020                                  "FR eap %p", conf);
2021                 }
2022
2023                 /*
2024                  *      Cache it, and DON'T auto-clear it.
2025                  */
2026                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_SERVER | SSL_SESS_CACHE_NO_AUTO_CLEAR);
2027
2028                 SSL_CTX_set_session_id_context(ctx,
2029                                                (unsigned char *) conf->session_context_id,
2030                                                (unsigned int) strlen(conf->session_context_id));
2031
2032                 /*
2033                  *      Our timeout is in hours, this is in seconds.
2034                  */
2035                 SSL_CTX_set_timeout(ctx, conf->session_timeout * 3600);
2036
2037                 /*
2038                  *      Set the maximum number of entries in the
2039                  *      session cache.
2040                  */
2041                 SSL_CTX_sess_set_cache_size(ctx, conf->session_cache_size);
2042
2043         } else {
2044                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
2045         }
2046
2047         return ctx;
2048 }
2049
2050
2051 void tls_server_conf_free(fr_tls_server_conf_t *conf)
2052 {
2053         if (!conf) return;
2054
2055         if (conf->cs) cf_section_parse_free(conf->cs, conf);
2056
2057         if (conf->ctx) SSL_CTX_free(conf->ctx);
2058
2059 #ifdef HAVE_OPENSSL_OCSP_H
2060         if (conf->ocsp_store) X509_STORE_free(conf->ocsp_store);
2061         conf->ocsp_store = NULL;
2062 #endif
2063
2064         memset(conf, 0, sizeof(*conf));
2065         free(conf);
2066 }
2067
2068
2069 fr_tls_server_conf_t *tls_server_conf_parse(CONF_SECTION *cs)
2070 {
2071         fr_tls_server_conf_t *conf;
2072
2073         conf = malloc(sizeof(*conf));
2074         if (!conf) {
2075                 radlog(L_ERR, "Out of memory");
2076                 return NULL;
2077         }
2078         memset(conf, 0, sizeof(*conf));
2079
2080         if (cf_section_parse(cs, conf, tls_server_config) < 0) {
2081         error:
2082                 tls_server_conf_free(conf);
2083                 return NULL;
2084         }
2085
2086         /*
2087          *      Save people from their own stupidity.
2088          */
2089         if (conf->fragment_size < 100) conf->fragment_size = 100;
2090
2091         /*
2092          *      This magic makes the administrators life HUGELY easier
2093          *      on initial deployments.
2094          *
2095          *      If the server starts up in debugging mode, AND the
2096          *      bootstrap command is configured, AND it exists, AND
2097          *      there is no server certificate
2098          */
2099         if (conf->make_cert_command && (debug_flag >= 2)) {
2100                 struct stat buf;
2101
2102                 if ((stat(conf->make_cert_command, &buf) == 0) &&
2103                     (stat(conf->certificate_file, &buf) < 0) &&
2104                     (errno == ENOENT) &&
2105                     (radius_exec_program(conf->make_cert_command, NULL, 1,
2106                                          NULL, 0, NULL, NULL, 0) != 0)) {
2107                         goto error;
2108                 }
2109         }
2110
2111         if (!conf->private_key_file) {
2112                 radlog(L_ERR, "TLS Server requires a private key file");
2113                 goto error;
2114         }
2115
2116         if (!conf->certificate_file) {
2117                 radlog(L_ERR, "TLS Server requires a certificate file");
2118                 goto error;
2119         }
2120
2121         /*
2122          *      Initialize TLS
2123          */
2124         conf->ctx = init_tls_ctx(conf, 0);
2125         if (conf->ctx == NULL) {
2126                 goto error;
2127         }
2128
2129 #ifdef HAVE_OPENSSL_OCSP_H
2130         /*
2131          *      Initialize OCSP Revocation Store
2132          */
2133         if (conf->ocsp_enable) {
2134                 conf->ocsp_store = init_revocation_store(conf);
2135                 if (conf->ocsp_store == NULL) goto error;
2136         }
2137 #endif /*HAVE_OPENSSL_OCSP_H*/
2138
2139         if (load_dh_params(conf->ctx, conf->dh_file) < 0) {
2140                 goto error;
2141         }
2142
2143         if (generate_eph_rsa_key(conf->ctx) < 0) {
2144                 goto error;
2145         }
2146
2147         if (conf->verify_tmp_dir) {
2148                 if (chmod(conf->verify_tmp_dir, S_IRWXU) < 0) {
2149                         radlog(L_ERR, "Failed changing permissions on %s: %s", conf->verify_tmp_dir, strerror(errno));
2150                         goto error;
2151                 }
2152         }
2153
2154         if (conf->verify_client_cert_cmd && !conf->verify_tmp_dir) {
2155                 radlog(L_ERR, "You MUST set the verify directory in order to use verify_client_cmd");
2156                 goto error;
2157         }
2158
2159         return conf;
2160 }
2161
2162 fr_tls_server_conf_t *tls_client_conf_parse(CONF_SECTION *cs)
2163 {
2164         fr_tls_server_conf_t *conf;
2165
2166         conf = malloc(sizeof(*conf));
2167         if (!conf) {
2168                 radlog(L_ERR, "Out of memory");
2169                 return NULL;
2170         }
2171         memset(conf, 0, sizeof(*conf));
2172
2173         if (cf_section_parse(cs, conf, tls_client_config) < 0) {
2174         error:
2175                 tls_server_conf_free(conf);
2176                 return NULL;
2177         }
2178
2179         /*
2180          *      Save people from their own stupidity.
2181          */
2182         if (conf->fragment_size < 100) conf->fragment_size = 100;
2183
2184         /*
2185          *      Initialize TLS
2186          */
2187         conf->ctx = init_tls_ctx(conf, 1);
2188         if (conf->ctx == NULL) {
2189                 goto error;
2190         }
2191
2192         if (load_dh_params(conf->ctx, conf->dh_file) < 0) {
2193                 goto error;
2194         }
2195
2196         if (generate_eph_rsa_key(conf->ctx) < 0) {
2197                 goto error;
2198         }
2199
2200         return conf;
2201 }
2202
2203 int tls_success(tls_session_t *ssn, REQUEST *request)
2204 {
2205         VALUE_PAIR *vp, *vps = NULL;
2206         fr_tls_server_conf_t *conf;
2207
2208         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CONF);
2209         rad_assert(conf != NULL);
2210
2211         /*
2212          *      If there's no session resumption, delete the entry
2213          *      from the cache.  This means either it's disabled
2214          *      globally for this SSL context, OR we were told to
2215          *      disable it for this user.
2216          *
2217          *      This also means you can't turn it on just for one
2218          *      user.
2219          */
2220         if ((!ssn->allow_session_resumption) ||
2221             (((vp = pairfind(request->config_items, 1127, 0)) != NULL) &&
2222              (vp->vp_integer == 0))) {
2223                 SSL_CTX_remove_session(ssn->ctx,
2224                                        ssn->ssl->session);
2225                 ssn->allow_session_resumption = 0;
2226
2227                 /*
2228                  *      If we're in a resumed session and it's
2229                  *      not allowed,
2230                  */
2231                 if (SSL_session_reused(ssn->ssl)) {
2232                         RDEBUG("FAIL: Forcibly stopping session resumption as it is not allowed.");
2233                         return -1;
2234                 }
2235
2236                 /*
2237                  *      Else resumption IS allowed, so we store the
2238                  *      user data in the cache.
2239                  */
2240         } else if (!SSL_session_reused(ssn->ssl)) {
2241                 size_t size;
2242                 char buffer[2 * MAX_SESSION_SIZE + 1];
2243
2244                 size = ssn->ssl->session->session_id_length;
2245                 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
2246
2247                 fr_bin2hex(ssn->ssl->session->session_id, buffer, size);
2248
2249
2250                 vp = paircopy2(request->reply->vps, PW_USER_NAME, 0);
2251                 if (vp) pairadd(&vps, vp);
2252
2253                 vp = paircopy2(request->packet->vps, PW_STRIPPED_USER_NAME, 0);
2254                 if (vp) pairadd(&vps, vp);
2255
2256                 vp = paircopy2(request->reply->vps, PW_CACHED_SESSION_POLICY, 0);
2257                 if (vp) pairadd(&vps, vp);
2258
2259                 if (vps) {
2260                         RDEBUG2("Saving session %s vps %p in the cache", buffer, vps);
2261                         SSL_SESSION_set_ex_data(ssn->ssl->session,
2262                                                 FR_TLS_EX_INDEX_VPS, vps);
2263                 } else {
2264                         RDEBUG2("WARNING: No information to cache: session caching will be disabled for session %s", buffer);
2265                         SSL_CTX_remove_session(ssn->ctx,
2266                                                ssn->ssl->session);
2267                 }
2268
2269                 /*
2270                  *      Else the session WAS allowed.  Copy the cached
2271                  *      reply.
2272                  */
2273         } else {
2274                 size_t size;
2275                 char buffer[2 * MAX_SESSION_SIZE + 1];
2276
2277                 size = ssn->ssl->session->session_id_length;
2278                 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
2279
2280                 fr_bin2hex(ssn->ssl->session->session_id, buffer, size);
2281
2282
2283                 vp = SSL_SESSION_get_ex_data(ssn->ssl->session,
2284                                              FR_TLS_EX_INDEX_VPS);
2285                 if (!vp) {
2286                         RDEBUG("WARNING: No information in cached session %s", buffer);
2287                         return -1;
2288
2289                 } else {
2290                         RDEBUG("Adding cached attributes for session %s vps %p to the reply:", buffer, vp);
2291                         debug_pair_list(vp);
2292                         pairadd(&request->reply->vps, paircopy(vp));
2293
2294                         /*
2295                          *      Mark the request as resumed.
2296                          */
2297                         vp = pairmake("EAP-Session-Resumed", "1", T_OP_SET);
2298                         if (vp) pairadd(&request->packet->vps, vp);
2299                 }
2300         }
2301
2302         return 0;
2303 }
2304
2305
2306 void tls_fail(tls_session_t *ssn)
2307 {
2308         /*
2309          *      Force the session to NOT be cached.
2310          */
2311         SSL_CTX_remove_session(ssn->ctx, ssn->ssl->session);
2312 }
2313
2314 fr_tls_status_t tls_application_data(tls_session_t *ssn,
2315                                      REQUEST *request)
2316
2317 {
2318         int err;
2319
2320         /*
2321          *      Decrypt the complete record.
2322          */
2323         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data,
2324                         ssn->dirty_in.used);
2325         if (err != (int) ssn->dirty_in.used) {
2326                 record_init(&ssn->dirty_in);
2327                 RDEBUG("Failed writing %d to SSL BIO: %d",
2328                        ssn->dirty_in.used, err);
2329                 return FR_TLS_FAIL;
2330         }
2331
2332         /*
2333          *      Clear the dirty buffer now that we are done with it
2334          *      and init the clean_out buffer to store decrypted data
2335          */
2336         record_init(&ssn->dirty_in);
2337         record_init(&ssn->clean_out);
2338
2339         /*
2340          *      Read (and decrypt) the tunneled data from the
2341          *      SSL session, and put it into the decrypted
2342          *      data buffer.
2343          */
2344         err = SSL_read(ssn->ssl, ssn->clean_out.data,
2345                        sizeof(ssn->clean_out.data));
2346
2347         if (err < 0) {
2348                 int code;
2349
2350                 RDEBUG("SSL_read Error");
2351
2352                 code = SSL_get_error(ssn->ssl, err);
2353                 switch (code) {
2354                 case SSL_ERROR_WANT_READ:
2355                         return FR_TLS_MORE_FRAGMENTS;
2356                         DEBUG("Error in fragmentation logic: SSL_WANT_READ");
2357                         break;
2358
2359                 case SSL_ERROR_WANT_WRITE:
2360                         DEBUG("Error in fragmentation logic: SSL_WANT_WRITE");
2361                         break;
2362
2363                 default:
2364                         DEBUG("Error in fragmentation logic: ?");
2365
2366                         /*
2367                          *      FIXME: Call int_ssl_check?
2368                          */
2369                         break;
2370                 }
2371                 return FR_TLS_FAIL;
2372         }
2373
2374         if (err == 0) {
2375                 RDEBUG("WARNING: No data inside of the tunnel.");
2376         }
2377
2378         /*
2379          *      Passed all checks, successfully decrypted data
2380          */
2381         ssn->clean_out.used = err;
2382
2383         return FR_TLS_OK;
2384 }
2385
2386
2387 /*
2388  * Acknowledge received is for one of the following messages sent earlier
2389  * 1. Handshake completed Message, so now send, EAP-Success
2390  * 2. Alert Message, now send, EAP-Failure
2391  * 3. Fragment Message, now send, next Fragment
2392  */
2393 fr_tls_status_t tls_ack_handler(tls_session_t *ssn, REQUEST *request)
2394 {
2395         RDEBUG2("Received TLS ACK");
2396
2397         if (ssn == NULL){
2398                 radlog_request(L_ERR, 0, request, "FAIL: Unexpected ACK received.  Could not obtain session information.");
2399                 return FR_TLS_INVALID;
2400         }
2401         if (ssn->info.initialized == 0) {
2402                 RDEBUG("No SSL info available. Waiting for more SSL data.");
2403                 return FR_TLS_REQUEST;
2404         }
2405         if ((ssn->info.content_type == handshake) &&
2406             (ssn->info.origin == 0)) {
2407                 radlog_request(L_ERR, 0, request, "FAIL: ACK without earlier message.");
2408                 return FR_TLS_INVALID;
2409         }
2410
2411         switch (ssn->info.content_type) {
2412         case alert:
2413                 RDEBUG2("ACK alert");
2414                 return FR_TLS_FAIL;
2415
2416         case handshake:
2417                 if ((ssn->info.handshake_type == finished) &&
2418                     (ssn->dirty_out.used == 0)) {
2419                         RDEBUG2("ACK handshake is finished");
2420
2421                         /*
2422                          *      From now on all the content is
2423                          *      application data set it here as nobody else
2424                          *      sets it.
2425                          */
2426                         ssn->info.content_type = application_data;
2427                         return FR_TLS_SUCCESS;
2428                 } /* else more data to send */
2429
2430                 RDEBUG2("ACK handshake fragment handler");
2431                 /* Fragmentation handler, send next fragment */
2432                 return FR_TLS_REQUEST;
2433
2434         case application_data:
2435                 RDEBUG2("ACK handshake fragment handler in application data");
2436                 return FR_TLS_REQUEST;
2437
2438                 /*
2439                  *      For the rest of the conditions, switch over
2440                  *      to the default section below.
2441                  */
2442         default:
2443                 RDEBUG2("ACK default");
2444                 radlog_request(L_ERR, 0, request, "Invalid ACK received: %d",
2445                        ssn->info.content_type);
2446                 return FR_TLS_INVALID;
2447         }
2448 }
2449
2450 static void dump_hex(const char *msg, const uint8_t *data, size_t data_len)
2451 {
2452         size_t i;
2453
2454         if (debug_flag < 3) return;
2455
2456         printf("%s %d\n", msg, (int) data_len);
2457         if (data_len > 256) data_len = 256;
2458
2459         for (i = 0; i < data_len; i++) {
2460                 if ((i & 0x0f) == 0x00) printf ("%02x: ", (unsigned int) i);
2461                 printf("%02x ", data[i]);
2462                 if ((i & 0x0f) == 0x0f) printf ("\n");
2463         }
2464         printf("\n");
2465         fflush(stdout);
2466 }
2467
2468 static void tls_socket_close(rad_listen_t *listener)
2469 {
2470         listen_socket_t *sock = listener->data;
2471
2472         listener->status = RAD_LISTEN_STATUS_REMOVE_FD;
2473         listener->tls = NULL; /* parent owns this! */
2474
2475         if (sock->parent) {
2476                 /*
2477                  *      Decrement the number of connections.
2478                  */
2479                 if (sock->parent->num_connections > 0) {
2480                         sock->parent->num_connections--;
2481                 }
2482                 if (sock->client->num_connections > 0) {
2483                         sock->client->num_connections--;
2484                 }
2485         }
2486
2487         /*
2488          *      Tell the event handler that an FD has disappeared.
2489          */
2490         DEBUG("Client has closed connection");
2491         event_new_fd(listener);
2492
2493         /*
2494          *      Do NOT free the listener here.  It's in use by
2495          *      a request, and will need to hang around until
2496          *      all of the requests are done.
2497          *
2498          *      It is instead free'd in remove_from_request_hash()
2499          */
2500 }
2501
2502 static int tls_socket_write(rad_listen_t *listener, REQUEST *request)
2503 {
2504         uint8_t *p;
2505         ssize_t rcode;
2506         listen_socket_t *sock = listener->data;
2507
2508         p = sock->ssn->dirty_out.data;
2509
2510         while (p < (sock->ssn->dirty_out.data + sock->ssn->dirty_out.used)) {
2511                 RDEBUG3("Writing to socket %d", request->packet->sockfd);
2512                 rcode = write(request->packet->sockfd, p,
2513                               (sock->ssn->dirty_out.data + sock->ssn->dirty_out.used) - p);
2514                 if (rcode <= 0) {
2515                         RDEBUG("Error writing to TLS socket: %s", strerror(errno));
2516
2517                         tls_socket_close(listener);
2518                         return 0;
2519                 }
2520                 p += rcode;
2521         }
2522
2523         sock->ssn->dirty_out.used = 0;
2524
2525         return 1;
2526 }
2527
2528
2529 static int tls_socket_recv(rad_listen_t *listener)
2530 {
2531         int doing_init = FALSE;
2532         ssize_t rcode;
2533         RADIUS_PACKET *packet;
2534         REQUEST *request;
2535         listen_socket_t *sock = listener->data;
2536         fr_tls_status_t status;
2537         RADCLIENT *client = sock->client;
2538
2539         if (!sock->packet) {
2540                 sock->packet = rad_alloc(0);
2541                 if (!sock->packet) return 0;
2542
2543                 sock->packet->sockfd = listener->fd;
2544                 sock->packet->src_ipaddr = sock->other_ipaddr;
2545                 sock->packet->src_port = sock->other_port;
2546                 sock->packet->dst_ipaddr = sock->my_ipaddr;
2547                 sock->packet->dst_port = sock->my_port;
2548
2549                 if (sock->request) sock->request->packet = sock->packet;
2550         }
2551
2552         /*
2553          *      Allocate a REQUEST for debugging.
2554          */
2555         if (!sock->request) {
2556                 sock->request = request = request_alloc();
2557                 if (!sock->request) {
2558                         radlog(L_ERR, "Out of memory");
2559                         return 0;
2560                 }
2561
2562                 rad_assert(request->packet == NULL);
2563                 rad_assert(sock->packet != NULL);
2564                 request->packet = sock->packet;
2565
2566                 request->component = "<core>";
2567                 request->component = "<tls-connect>";
2568
2569                 /*
2570                  *      Not sure if we should do this on every packet...
2571                  */
2572                 request->reply = rad_alloc(0);
2573                 if (!request->reply) return 0;
2574
2575                 request->options = RAD_REQUEST_OPTION_DEBUG2;
2576
2577                 rad_assert(sock->ssn == NULL);
2578
2579                 sock->ssn = tls_new_session(listener->tls, sock->request,
2580                                             listener->tls->require_client_cert);
2581                 if (!sock->ssn) {
2582                         request_free(&sock->request);
2583                         sock->packet = NULL;
2584                         return 0;
2585                 }
2586
2587                 SSL_set_ex_data(sock->ssn->ssl, FR_TLS_EX_INDEX_REQUEST, (void *)request);
2588                 SSL_set_ex_data(sock->ssn->ssl, FR_TLS_EX_INDEX_CERTS, (void *)&request->packet->vps);
2589
2590                 doing_init = TRUE;
2591         }
2592
2593         rad_assert(sock->request != NULL);
2594         rad_assert(sock->request->packet != NULL);
2595         rad_assert(sock->packet != NULL);
2596         rad_assert(sock->ssn != NULL);
2597
2598         request = sock->request;
2599
2600         RDEBUG3("Reading from socket %d", request->packet->sockfd);
2601         PTHREAD_MUTEX_LOCK(&sock->mutex);
2602         rcode = read(request->packet->sockfd,
2603                      sock->ssn->dirty_in.data,
2604                      sizeof(sock->ssn->dirty_in.data));
2605         if ((rcode < 0) && (errno == ECONNRESET)) {
2606         do_close:
2607                 PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2608                 tls_socket_close(listener);
2609                 return 0;
2610         }
2611
2612         if (rcode < 0) {
2613                 RDEBUG("Error reading TLS socket: %s", strerror(errno));
2614                 goto do_close;
2615         }
2616
2617         /*
2618          *      Normal socket close.
2619          */
2620         if (rcode == 0) goto do_close;
2621
2622         sock->ssn->dirty_in.used = rcode;
2623         memset(sock->ssn->dirty_in.data + sock->ssn->dirty_in.used,
2624                0, 16);
2625
2626         dump_hex("READ FROM SSL", sock->ssn->dirty_in.data, sock->ssn->dirty_in.used);
2627
2628         /*
2629          *      Catch attempts to use non-SSL.
2630          */
2631         if (doing_init && (sock->ssn->dirty_in.data[0] != handshake)) {
2632                 RDEBUG("Non-TLS data sent to TLS socket: closing");
2633                 goto do_close;
2634         }
2635
2636         /*
2637          *      Skip ahead to reading application data.
2638          */
2639         if (SSL_is_init_finished(sock->ssn->ssl)) goto app;
2640
2641         if (!tls_handshake_recv(request, sock->ssn)) {
2642                 RDEBUG("FAILED in TLS handshake receive");
2643                 goto do_close;
2644         }
2645
2646         if (sock->ssn->dirty_out.used > 0) {
2647                 tls_socket_write(listener, request);
2648                 PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2649                 return 0;
2650         }
2651
2652 app:
2653         /*
2654          *      FIXME: Run the packet through a virtual server in
2655          *      order to see if we like the certificate presented by
2656          *      the client.
2657          */
2658
2659         status = tls_application_data(sock->ssn, request);
2660         RDEBUG("Application data status %d", status);
2661
2662         if (status == FR_TLS_MORE_FRAGMENTS) {
2663                 PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2664                 return 0;
2665         }
2666
2667         if (sock->ssn->clean_out.used == 0) {
2668                 PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2669                 return 0;
2670         }
2671
2672         dump_hex("TUNNELED DATA", sock->ssn->clean_out.data, sock->ssn->clean_out.used);
2673
2674         /*
2675          *      If the packet is a complete RADIUS packet, return it to
2676          *      the caller.  Otherwise...
2677          */
2678         if ((sock->ssn->clean_out.used < 20) ||
2679             (((sock->ssn->clean_out.data[2] << 8) | sock->ssn->clean_out.data[3]) != (int) sock->ssn->clean_out.used)) {
2680                 RDEBUG("Received bad packet: Length %d contents %d",
2681                        sock->ssn->clean_out.used,
2682                        (sock->ssn->clean_out.data[2] << 8) | sock->ssn->clean_out.data[3]);
2683                 goto do_close;
2684         }
2685
2686         packet = sock->packet;
2687         packet->data = rad_malloc(sock->ssn->clean_out.used);
2688         packet->data_len = sock->ssn->clean_out.used;
2689         record_minus(&sock->ssn->clean_out, packet->data, packet->data_len);
2690         packet->vps = NULL;
2691         PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2692
2693         if (!rad_packet_ok(packet, 0)) {
2694                 RDEBUG("Received bad packet: %s", fr_strerror());
2695                 tls_socket_close(listener);
2696                 return 0;       /* do_close unlocks the mutex */
2697         }
2698
2699         /*
2700          *      Copied from src/lib/radius.c, rad_recv();
2701          */
2702         if (fr_debug_flag) {
2703                 char host_ipaddr[128];
2704
2705                 if ((packet->code > 0) && (packet->code < FR_MAX_PACKET_CODE)) {
2706                         RDEBUG("tls_recv: %s packet from host %s port %d, id=%d, length=%d",
2707                                fr_packet_codes[packet->code],
2708                                inet_ntop(packet->src_ipaddr.af,
2709                                          &packet->src_ipaddr.ipaddr,
2710                                          host_ipaddr, sizeof(host_ipaddr)),
2711                                packet->src_port,
2712                                packet->id, (int) packet->data_len);
2713                 } else {
2714                         RDEBUG("tls_recv: Packet from host %s port %d code=%d, id=%d, length=%d",
2715                                inet_ntop(packet->src_ipaddr.af,
2716                                          &packet->src_ipaddr.ipaddr,
2717                                          host_ipaddr, sizeof(host_ipaddr)),
2718                                packet->src_port,
2719                                packet->code,
2720                                packet->id, (int) packet->data_len);
2721                 }
2722         }
2723
2724         FR_STATS_INC(auth, total_requests);
2725
2726         return 1;
2727 }
2728
2729
2730 int dual_tls_recv(rad_listen_t *listener)
2731 {
2732         RADIUS_PACKET *packet;
2733         REQUEST *request;
2734         RAD_REQUEST_FUNP fun = NULL;
2735         listen_socket_t *sock = listener->data;
2736         RADCLIENT       *client = sock->client;
2737
2738         if (!tls_socket_recv(listener)) {
2739                 return 0;
2740         }
2741
2742         rad_assert(sock->request != NULL);
2743         rad_assert(sock->request->packet != NULL);
2744         rad_assert(sock->packet != NULL);
2745         rad_assert(sock->ssn != NULL);
2746
2747         request = sock->request;
2748         packet = sock->packet;
2749
2750         /*
2751          *      Some sanity checks, based on the packet code.
2752          */
2753         switch(packet->code) {
2754         case PW_AUTHENTICATION_REQUEST:
2755                 if (listener->type != RAD_LISTEN_AUTH) goto bad_packet;
2756                 FR_STATS_INC(auth, total_requests);
2757                 fun = rad_authenticate;
2758                 break;
2759
2760         case PW_ACCOUNTING_REQUEST:
2761                 if (listener->type != RAD_LISTEN_ACCT) goto bad_packet;
2762                 FR_STATS_INC(acct, total_requests);
2763                 fun = rad_accounting;
2764                 break;
2765
2766         case PW_STATUS_SERVER:
2767                 if (!mainconfig.status_server) {
2768                         FR_STATS_INC(auth, total_unknown_types);
2769                         DEBUG("WARNING: Ignoring Status-Server request due to security configuration");
2770                         rad_free(&sock->packet);
2771                         request->packet = NULL;
2772                         return 0;
2773                 }
2774                 fun = rad_status_server;
2775                 break;
2776
2777         default:
2778         bad_packet:
2779                 FR_STATS_INC(auth, total_unknown_types);
2780
2781                 DEBUG("Invalid packet code %d sent from client %s port %d : IGNORED",
2782                       packet->code, client->shortname, packet->src_port);
2783                 rad_free(&sock->packet);
2784                 request->packet = NULL;
2785                 return 0;
2786         } /* switch over packet types */
2787
2788         if (!request_receive(listener, packet, client, fun)) {
2789                 FR_STATS_INC(auth, total_packets_dropped);
2790                 rad_free(&sock->packet);
2791                 request->packet = NULL;
2792                 return 0;
2793         }
2794
2795         sock->packet = NULL;    /* we have no need for more partial reads */
2796         request->packet = NULL;
2797
2798         return 1;
2799 }
2800
2801
2802 /*
2803  *      Send a response packet
2804  */
2805 int dual_tls_send(rad_listen_t *listener, REQUEST *request)
2806 {
2807         listen_socket_t *sock = listener->data;
2808
2809         rad_assert(request->listener == listener);
2810         rad_assert(listener->send == dual_tls_send);
2811
2812         /*
2813          *      Accounting reject's are silently dropped.
2814          *
2815          *      We do it here to avoid polluting the rest of the
2816          *      code with this knowledge
2817          */
2818         if (request->reply->code == 0) return 0;
2819
2820         /*
2821          *      Pack the VPs
2822          */
2823         if (rad_encode(request->reply, request->packet,
2824                        request->client->secret) < 0) {
2825                 RDEBUG("Failed encoding packet: %s", fr_strerror());
2826                 return 0;
2827         }
2828
2829         /*
2830          *      Sign the packet.
2831          */
2832         if (rad_sign(request->reply, request->packet,
2833                        request->client->secret) < 0) {
2834                 RDEBUG("Failed signing packet: %s", fr_strerror());
2835                 return 0;
2836         }
2837
2838         PTHREAD_MUTEX_LOCK(&sock->mutex);
2839         /*
2840          *      Write the packet to the SSL buffers.
2841          */
2842         record_plus(&sock->ssn->clean_in,
2843                     request->reply->data, request->reply->data_len);
2844
2845         /*
2846          *      Do SSL magic to get encrypted data.
2847          */
2848         tls_handshake_send(request, sock->ssn);
2849
2850         /*
2851          *      And finally write the data to the socket.
2852          */
2853         if (sock->ssn->dirty_out.used > 0) {
2854                 dump_hex("WRITE TO SSL", sock->ssn->dirty_out.data, sock->ssn->dirty_out.used);
2855
2856                 tls_socket_write(listener, request);
2857         }
2858         PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2859
2860         return 0;
2861 }
2862
2863
2864 int proxy_tls_recv(rad_listen_t *listener)
2865 {
2866         int rcode;
2867         size_t length;
2868         listen_socket_t *sock = listener->data;
2869         char buffer[256];
2870         uint8_t data[1024];
2871         RADIUS_PACKET *packet;
2872         RAD_REQUEST_FUNP fun = NULL;
2873
2874         DEBUG3("Proxy SSL socket has data to read");
2875         PTHREAD_MUTEX_LOCK(&sock->mutex);
2876 redo:
2877         rcode = SSL_read(sock->ssn->ssl, data, 4);
2878         if (rcode <= 0) {
2879                 int err = SSL_get_error(sock->ssn->ssl, rcode);
2880                 switch (err) {
2881                 case SSL_ERROR_WANT_READ:
2882                 case SSL_ERROR_WANT_WRITE:
2883                         rcode = 0;
2884                         goto redo;
2885                 case SSL_ERROR_ZERO_RETURN:
2886                         /* remote end sent close_notify, send one back */
2887                         SSL_shutdown(sock->ssn->ssl);
2888
2889                 case SSL_ERROR_SYSCALL:
2890                 do_close:
2891                         PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2892                         tls_socket_close(listener);
2893                         return 0;
2894
2895                 default:
2896                         while ((err = ERR_get_error())) {
2897                                 DEBUG("proxy recv says %s",
2898                                       ERR_error_string(err, NULL));
2899                         }
2900
2901                         goto do_close;
2902                 }
2903         }
2904
2905         length = (data[2] << 8) | data[3];
2906         DEBUG3("Proxy received header saying we have a packet of %u bytes",
2907                (unsigned int) length);
2908
2909         if (length > sizeof(data)) {
2910                 DEBUG("Received packet will be too large! (%u)",
2911                       (data[2] << 8) | data[3]);
2912                 goto do_close;
2913         }
2914
2915         rcode = SSL_read(sock->ssn->ssl, data + 4, length);
2916         if (rcode <= 0) {
2917                 switch (SSL_get_error(sock->ssn->ssl, rcode)) {
2918                 case SSL_ERROR_WANT_READ:
2919                 case SSL_ERROR_WANT_WRITE:
2920                         rcode = 0;
2921                         break;
2922
2923                 case SSL_ERROR_ZERO_RETURN:
2924                         /* remote end sent close_notify, send one back */
2925                         SSL_shutdown(sock->ssn->ssl);
2926                         goto do_close;
2927                 default:
2928                         goto do_close;
2929                 }
2930         }
2931         PTHREAD_MUTEX_UNLOCK(&sock->mutex);
2932
2933         packet = rad_alloc(0);
2934         packet->sockfd = listener->fd;
2935         packet->src_ipaddr = sock->other_ipaddr;
2936         packet->src_port = sock->other_port;
2937         packet->dst_ipaddr = sock->my_ipaddr;
2938         packet->dst_port = sock->my_port;
2939         packet->code = data[0];
2940         packet->id = data[1];
2941         packet->data_len = length;
2942         packet->data = rad_malloc(packet->data_len);
2943         memcpy(packet->data, data, packet->data_len);
2944         memcpy(packet->vector, packet->data + 4, 16);
2945
2946         /*
2947          *      FIXME: Client MIB updates?
2948          */
2949         switch(packet->code) {
2950         case PW_AUTHENTICATION_ACK:
2951         case PW_ACCESS_CHALLENGE:
2952         case PW_AUTHENTICATION_REJECT:
2953                 fun = rad_authenticate;
2954                 break;
2955
2956 #ifdef WITH_ACCOUNTING
2957         case PW_ACCOUNTING_RESPONSE:
2958                 fun = rad_accounting;
2959                 break;
2960 #endif
2961
2962         default:
2963                 /*
2964                  *      FIXME: Update MIB for packet types?
2965                  */
2966                 radlog(L_ERR, "Invalid packet code %d sent to a proxy port "
2967                        "from home server %s port %d - ID %d : IGNORED",
2968                        packet->code,
2969                        ip_ntoh(&packet->src_ipaddr, buffer, sizeof(buffer)),
2970                        packet->src_port, packet->id);
2971                 rad_free(&packet);
2972                 return 0;
2973         }
2974
2975         if (!request_proxy_reply(packet)) {
2976                 rad_free(&packet);
2977                 return 0;
2978         }
2979
2980         return 1;
2981 }
2982
2983 int proxy_tls_send(rad_listen_t *listener, REQUEST *request)
2984 {
2985         int rcode;
2986         listen_socket_t *sock = listener->data;
2987
2988         /*
2989          *      Normal proxying calls us with the data already
2990          *      encoded.  The "ping home server" code does not.  So,
2991          *      if there's no packet, encode it here.
2992          */
2993         if (!request->proxy->data) {
2994                 request->proxy_listener->encode(request->proxy_listener,
2995                                                 request);
2996         }
2997
2998         DEBUG3("Proxy is writing %u bytes to SSL",
2999                (unsigned int) request->proxy->data_len);
3000         PTHREAD_MUTEX_LOCK(&sock->mutex);
3001         while ((rcode = SSL_write(sock->ssn->ssl, request->proxy->data,
3002                                   request->proxy->data_len)) < 0) {
3003                 int err;
3004                 while ((err = ERR_get_error())) {
3005                         DEBUG("proxy SSL_write says %s",
3006                               ERR_error_string(err, NULL));
3007                 }
3008                 PTHREAD_MUTEX_UNLOCK(&sock->mutex);
3009                 tls_socket_close(listener);
3010                 return 0;
3011         }
3012         PTHREAD_MUTEX_UNLOCK(&sock->mutex);
3013
3014         return 1;
3015 }
3016
3017 #endif  /* WITH_TLS */