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