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 RCSID("$Id$")
  26 USES_APPLE_DEPRECATED_API       /* OpenSSL API has been deprecated by Apple */
  27
  28 #include <freeradius-devel/radiusd.h>
  29 #include <freeradius-devel/process.h>
  30 #include <freeradius-devel/rad_assert.h>
  31
  32 #ifdef HAVE_SYS_STAT_H
  33 #include <sys/stat.h>
  34 #endif
  35
  36 #ifdef HAVE_FCNTL_H
  37 #include <fcntl.h>
  38 #endif
  39
  40 #ifdef HAVE_UTIME_H
  41 #include <utime.h>
  42 #endif
  43
  44 #ifdef WITH_TLS
  45 #ifdef HAVE_OPENSSL_RAND_H
  46 #include <openssl/rand.h>
  47 #endif
  48
  49 #ifdef HAVE_OPENSSL_OCSP_H
  50 #include <openssl/ocsp.h>
  51 #endif
  52
  53 static void tls_server_conf_free(fr_tls_server_conf_t *conf);
  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, void const *ptr,
  59                                     unsigned int size);
  60 static unsigned int     record_minus(record_t *buf, void *ptr,
  61                                      unsigned int size);
  62
  63 #ifdef PSK_MAX_IDENTITY_LEN
  64 static unsigned int psk_server_callback(SSL *ssl, char const *identity,
  65                                         unsigned char *psk,
  66                                         unsigned int max_psk_len)
  67 {
  68         unsigned int psk_len;
  69         fr_tls_server_conf_t *conf;
  70
  71         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl,
  72                                                        FR_TLS_EX_INDEX_CONF);
  73         if (!conf) return 0;
  74
  75         /*
  76          *      FIXME: Look up the PSK password based on the identity!
  77          */
  78         if (strcmp(identity, conf->psk_identity) != 0) {
  79                 return 0;
  80         }
  81
  82         psk_len = strlen(conf->psk_password);
  83         if (psk_len > (2 * max_psk_len)) return 0;
  84
  85         return fr_hex2bin(conf->psk_password, psk, psk_len);
  86 }
  87
  88 static unsigned int psk_client_callback(SSL *ssl, UNUSED char const *hint,
  89                                         char *identity, unsigned int max_identity_len,
  90                                         unsigned char *psk, unsigned int max_psk_len)
  91 {
  92         unsigned int psk_len;
  93         fr_tls_server_conf_t *conf;
  94
  95         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl,
  96                                                        FR_TLS_EX_INDEX_CONF);
  97         if (!conf) return 0;
  98
  99         psk_len = strlen(conf->psk_password);
 100         if (psk_len > (2 * max_psk_len)) return 0;
 101
 102         strlcpy(identity, conf->psk_identity, max_identity_len);
 103
 104         return fr_hex2bin(conf->psk_password, psk, psk_len);
 105 }
 106
 107 #endif
 108
 109 tls_session_t *tls_new_client_session(fr_tls_server_conf_t *conf, int fd)
 110 {
 111         int verify_mode;
 112         tls_session_t *ssn = NULL;
 113
 114         ssn = talloc_zero(conf, tls_session_t);
 115         if (!ssn) return NULL;
 116
 117         ssn->ctx = conf->ctx;
 118         ssn->ssl = SSL_new(ssn->ctx);
 119         rad_assert(ssn->ssl != NULL);
 120
 121         /*
 122          *      Add the message callback to identify what type of
 123          *      message/handshake is passed
 124          */
 125         SSL_set_msg_callback(ssn->ssl, cbtls_msg);
 126         SSL_set_msg_callback_arg(ssn->ssl, ssn);
 127         SSL_set_info_callback(ssn->ssl, cbtls_info);
 128
 129         /*
 130          *      Always verify the peer certificate.
 131          */
 132         DEBUG2("Requiring Server certificate");
 133         verify_mode = SSL_VERIFY_PEER;
 134         verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
 135         SSL_set_verify(ssn->ssl, verify_mode, cbtls_verify);
 136
 137         SSL_set_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CONF, (void *)conf);
 138         SSL_set_ex_data(ssn->ssl, FR_TLS_EX_INDEX_SSN, (void *)ssn);
 139         SSL_set_fd(ssn->ssl, fd);
 140         if (SSL_connect(ssn->ssl) <= 0) {
 141                 int err;
 142                 while ((err = ERR_get_error())) {
 143                         DEBUG("OpenSSL Err says %s",
 144                               ERR_error_string(err, NULL));
 145                 }
 146                 talloc_free(ssn);
 147                 return NULL;
 148         }
 149
 150         ssn->offset = conf->fragment_size;
 151
 152         return ssn;
 153 }
 154
 155 tls_session_t *tls_new_session(fr_tls_server_conf_t *conf, REQUEST *request,
 156                                int client_cert)
 157 {
 158         tls_session_t *state = NULL;
 159         SSL *new_tls = NULL;
 160         int             verify_mode = 0;
 161         VALUE_PAIR      *vp;
 162
 163         /*
 164          *      Manually flush the sessions every so often.  If HALF
 165          *      of the session lifetime has passed since we last
 166          *      flushed, then flush it again.
 167          *
 168          *      FIXME: Also do it every N sessions?
 169          */
 170         if (conf->session_cache_enable &&
 171             ((conf->session_last_flushed + (conf->session_timeout * 1800)) <= request->timestamp)){
 172                 RDEBUG2("Flushing SSL sessions (of #%ld)",
 173                         SSL_CTX_sess_number(conf->ctx));
 174
 175                 SSL_CTX_flush_sessions(conf->ctx, request->timestamp);
 176                 conf->session_last_flushed = request->timestamp;
 177         }
 178
 179         if ((new_tls = SSL_new(conf->ctx)) == NULL) {
 180                 ERROR("SSL: Error creating new SSL: %s",
 181                        ERR_error_string(ERR_get_error(), NULL));
 182                 return NULL;
 183         }
 184
 185         /* We use the SSL's "app_data" to indicate a call-back */
 186         SSL_set_app_data(new_tls, NULL);
 187
 188         state = talloc_zero(conf, tls_session_t);
 189         session_init(state);
 190
 191         state->ctx = conf->ctx;
 192         state->ssl = new_tls;
 193
 194         /*
 195          *      Initialize callbacks
 196          */
 197         state->record_init = record_init;
 198         state->record_close = record_close;
 199         state->record_plus = record_plus;
 200         state->record_minus = record_minus;
 201
 202         /*
 203          *      Create & hook the BIOs to handle the dirty side of the
 204          *      SSL.  This is *very important* as we want to handle
 205          *      the transmission part.  Now the only IO interface
 206          *      that SSL is aware of, is our defined BIO buffers.
 207          *
 208          *      This means that all SSL IO is done to/from memory,
 209          *      and we can update those BIOs from the packets we've
 210          *      received.
 211          */
 212         state->into_ssl = BIO_new(BIO_s_mem());
 213         state->from_ssl = BIO_new(BIO_s_mem());
 214         SSL_set_bio(state->ssl, state->into_ssl, state->from_ssl);
 215
 216         /*
 217          *      Add the message callback to identify what type of
 218          *      message/handshake is passed
 219          */
 220         SSL_set_msg_callback(new_tls, cbtls_msg);
 221         SSL_set_msg_callback_arg(new_tls, state);
 222         SSL_set_info_callback(new_tls, cbtls_info);
 223
 224         /*
 225          *      In Server mode we only accept.
 226          */
 227         SSL_set_accept_state(state->ssl);
 228
 229         /*
 230          *      Verify the peer certificate, if asked.
 231          */
 232         if (client_cert) {
 233                 RDEBUG2("Requiring client certificate");
 234                 verify_mode = SSL_VERIFY_PEER;
 235                 verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
 236                 verify_mode |= SSL_VERIFY_CLIENT_ONCE;
 237         }
 238         SSL_set_verify(state->ssl, verify_mode, cbtls_verify);
 239
 240         SSL_set_ex_data(state->ssl, FR_TLS_EX_INDEX_CONF, (void *)conf);
 241         SSL_set_ex_data(state->ssl, FR_TLS_EX_INDEX_SSN, (void *)state);
 242         state->length_flag = conf->include_length;
 243
 244         /*
 245          *      We use default fragment size, unless the Framed-MTU
 246          *      tells us it's too big.  Note that we do NOT account
 247          *      for the EAP-TLS headers if conf->fragment_size is
 248          *      large, because that config item looks to be confusing.
 249          *
 250          *      i.e. it should REALLY be called MTU, and the code here
 251          *      should figure out what that means for TLS fragment size.
 252          *      asking the administrator to know the internal details
 253          *      of EAP-TLS in order to calculate fragment sizes is
 254          *      just too much.
 255          */
 256         state->offset = conf->fragment_size;
 257         vp = pairfind(request->packet->vps, PW_FRAMED_MTU, 0, TAG_ANY);
 258         if (vp && (vp->vp_integer > 100) && (vp->vp_integer < state->offset)) {
 259                 state->offset = vp->vp_integer;
 260         }
 261
 262         if (conf->session_cache_enable) {
 263                 state->allow_session_resumption = 1; /* otherwise it's zero */
 264         }
 265
 266         RDEBUG2("Initiate");
 267
 268         return state;
 269 }
 270
 271 /*
 272  *      Print out some text describing the error.
 273  */
 274 static int int_ssl_check(REQUEST *request, SSL *s, int ret, char const *text)
 275 {
 276         int e;
 277         unsigned long l;
 278
 279         if ((l = ERR_get_error()) != 0) {
 280                 char const *p = ERR_error_string(l, NULL);
 281
 282                 if (request && p) RDEBUGE("SSL says: %s", p);
 283         }
 284         e = SSL_get_error(s, ret);
 285
 286         switch(e) {
 287                 /*
 288                  *      These seem to be harmless and already "dealt
 289                  *      with" by our non-blocking environment. NB:
 290                  *      "ZERO_RETURN" is the clean "error"
 291                  *      indicating a successfully closed SSL
 292                  *      tunnel. We let this happen because our IO
 293                  *      loop should not appear to have broken on
 294                  *      this condition - and outside the IO loop, the
 295                  *      "shutdown" state is checked.
 296                  *
 297                  *      Don't print anything if we ignore the error.
 298                  */
 299         case SSL_ERROR_NONE:
 300         case SSL_ERROR_WANT_READ:
 301         case SSL_ERROR_WANT_WRITE:
 302         case SSL_ERROR_WANT_X509_LOOKUP:
 303         case SSL_ERROR_ZERO_RETURN:
 304                 break;
 305
 306                 /*
 307                  *      These seem to be indications of a genuine
 308                  *      error that should result in the SSL tunnel
 309                  *      being regarded as "dead".
 310                  */
 311         case SSL_ERROR_SYSCALL:
 312                 ERROR("SSL: %s failed in a system call (%d), TLS session fails.",
 313                        text, ret);
 314                 return 0;
 315
 316         case SSL_ERROR_SSL:
 317                 ERROR("SSL: %s failed inside of TLS (%d), TLS session fails.",
 318                        text, ret);
 319                 return 0;
 320
 321         default:
 322                 /*
 323                  *      For any other errors that (a) exist, and (b)
 324                  *      crop up - we need to interpret what to do with
 325                  *      them - so "politely inform" the caller that
 326                  *      the code needs updating here.
 327                  */
 328                 ERROR("SSL: FATAL SSL error ..... %d\n", e);
 329                 return 0;
 330         }
 331
 332         return 1;
 333 }
 334
 335 /*
 336  * We are the server, we always get the dirty data
 337  * (Handshake data is also considered as dirty data)
 338  * During handshake, since SSL API handles itself,
 339  * After clean-up, dirty_out will be filled with
 340  * the data required for handshaking. So we check
 341  * if dirty_out is empty then we simply send it back.
 342  * As of now, if handshake is successful, then we keep going,
 343  * otherwise we fail.
 344  *
 345  * Fill the Bio with the dirty data to clean it
 346  * Get the cleaned data from SSL, if it is not Handshake data
 347  */
 348 int tls_handshake_recv(REQUEST *request, tls_session_t *ssn)
 349 {
 350         int err;
 351
 352         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data, ssn->dirty_in.used);
 353         if (err != (int) ssn->dirty_in.used) {
 354                 RDEBUG("Failed writing %d to SSL BIO: %d", ssn->dirty_in.used,
 355                         err);
 356                 record_init(&ssn->dirty_in);
 357                 return 0;
 358         }
 359         record_init(&ssn->dirty_in);
 360
 361         err = SSL_read(ssn->ssl, ssn->clean_out.data + ssn->clean_out.used,
 362                        sizeof(ssn->clean_out.data) - ssn->clean_out.used);
 363         if (err > 0) {
 364                 ssn->clean_out.used += err;
 365                 return 1;
 366         }
 367
 368         if (!int_ssl_check(request, ssn->ssl, err, "SSL_read")) {
 369                 return 0;
 370         }
 371
 372         /* Some Extra STATE information for easy debugging */
 373         if (SSL_is_init_finished(ssn->ssl)) {
 374                 DEBUG2("SSL Connection Established\n");
 375         }
 376         if (SSL_in_init(ssn->ssl)) {
 377                 DEBUG2("In SSL Handshake Phase\n");
 378         }
 379         if (SSL_in_before(ssn->ssl)) {
 380                 DEBUG2("Before SSL Handshake Phase\n");
 381         }
 382         if (SSL_in_accept_init(ssn->ssl)) {
 383                 DEBUG2("In SSL Accept mode \n");
 384         }
 385         if (SSL_in_connect_init(ssn->ssl)) {
 386                 DEBUG2("In SSL Connect mode \n");
 387         }
 388
 389         err = BIO_ctrl_pending(ssn->from_ssl);
 390         if (err > 0) {
 391                 err = BIO_read(ssn->from_ssl, ssn->dirty_out.data,
 392                                sizeof(ssn->dirty_out.data));
 393                 if (err > 0) {
 394                         ssn->dirty_out.used = err;
 395
 396                 } else if (BIO_should_retry(ssn->from_ssl)) {
 397                         record_init(&ssn->dirty_in);
 398                         DEBUG2("  tls: Asking for more data in tunnel");
 399                         return 1;
 400
 401                 } else {
 402                         int_ssl_check(request, ssn->ssl, err, "BIO_read");
 403                         record_init(&ssn->dirty_in);
 404                         return 0;
 405                 }
 406         } else {
 407                 DEBUG2("SSL Application Data");
 408                 /* Its clean application data, do whatever we want */
 409                 record_init(&ssn->clean_out);
 410         }
 411
 412         /* We are done with dirty_in, reinitialize it */
 413         record_init(&ssn->dirty_in);
 414         return 1;
 415 }
 416
 417 /*
 418  *      Take clear-text user data, and encrypt it into the output buffer,
 419  *      to send to the client at the other end of the SSL connection.
 420  */
 421 int tls_handshake_send(REQUEST *request, tls_session_t *ssn)
 422 {
 423         int err;
 424
 425         /*
 426          *      If there's un-encrypted data in 'clean_in', then write
 427          *      that data to the SSL session, and then call the BIO function
 428          *      to get that encrypted data from the SSL session, into
 429          *      a buffer which we can then package into an EAP packet.
 430          *
 431          *      Based on Server's logic this clean_in is expected to
 432          *      contain the data to send to the client.
 433          */
 434         if (ssn->clean_in.used > 0) {
 435                 int written;
 436
 437                 written = SSL_write(ssn->ssl, ssn->clean_in.data, ssn->clean_in.used);
 438                 record_minus(&ssn->clean_in, NULL, written);
 439
 440                 /* Get the dirty data from Bio to send it */
 441                 err = BIO_read(ssn->from_ssl, ssn->dirty_out.data,
 442                                sizeof(ssn->dirty_out.data));
 443                 if (err > 0) {
 444                         ssn->dirty_out.used = err;
 445                 } else {
 446                         int_ssl_check(request, ssn->ssl, err, "handshake_send");
 447                 }
 448         }
 449
 450         return 1;
 451 }
 452
 453 void session_init(tls_session_t *ssn)
 454 {
 455         ssn->ssl = NULL;
 456         ssn->into_ssl = ssn->from_ssl = NULL;
 457         record_init(&ssn->clean_in);
 458         record_init(&ssn->clean_out);
 459         record_init(&ssn->dirty_in);
 460         record_init(&ssn->dirty_out);
 461
 462         memset(&ssn->info, 0, sizeof(ssn->info));
 463
 464         ssn->offset = 0;
 465         ssn->fragment = 0;
 466         ssn->tls_msg_len = 0;
 467         ssn->length_flag = 0;
 468         ssn->opaque = NULL;
 469         ssn->free_opaque = NULL;
 470 }
 471
 472 void session_close(tls_session_t *ssn)
 473 {
 474         SSL_set_quiet_shutdown(ssn->ssl, 1);
 475         SSL_shutdown(ssn->ssl);
 476
 477         if(ssn->ssl)
 478                 SSL_free(ssn->ssl);
 479
 480         record_close(&ssn->clean_in);
 481         record_close(&ssn->clean_out);
 482         record_close(&ssn->dirty_in);
 483         record_close(&ssn->dirty_out);
 484         session_init(ssn);
 485 }
 486
 487 void session_free(void *ssn)
 488 {
 489         tls_session_t *sess = (tls_session_t *)ssn;
 490
 491         if (!ssn) return;
 492
 493         /*
 494          *      Free any opaque TTLS or PEAP data.
 495          */
 496         if ((sess->opaque) && (sess->free_opaque)) {
 497                 sess->free_opaque(sess->opaque);
 498                 sess->opaque = NULL;
 499         }
 500
 501         session_close(sess);
 502
 503         talloc_free(sess);
 504 }
 505
 506 static void record_init(record_t *rec)
 507 {
 508         rec->used = 0;
 509 }
 510
 511 static void record_close(record_t *rec)
 512 {
 513         rec->used = 0;
 514 }
 515
 516
 517 /*
 518  *      Copy data to the intermediate buffer, before we send
 519  *      it somewhere.
 520  */
 521 static unsigned int record_plus(record_t *rec, void const *ptr,
 522                                 unsigned int size)
 523 {
 524         unsigned int added = MAX_RECORD_SIZE - rec->used;
 525
 526         if(added > size)
 527                 added = size;
 528         if(added == 0)
 529                 return 0;
 530         memcpy(rec->data + rec->used, ptr, added);
 531         rec->used += added;
 532         return added;
 533 }
 534
 535 /*
 536  *      Take data from the buffer, and give it to the caller.
 537  */
 538 static unsigned int record_minus(record_t *rec, void *ptr,
 539                                  unsigned int size)
 540 {
 541         unsigned int taken = rec->used;
 542
 543         if(taken > size)
 544                 taken = size;
 545         if(taken == 0)
 546                 return 0;
 547         if(ptr)
 548                 memcpy(ptr, rec->data, taken);
 549         rec->used -= taken;
 550
 551         /*
 552          *      This is pretty bad...
 553          */
 554         if(rec->used > 0)
 555                 memmove(rec->data, rec->data + taken, rec->used);
 556         return taken;
 557 }
 558
 559 void tls_session_information(tls_session_t *tls_session)
 560 {
 561         char const *str_write_p, *str_version, *str_content_type = "";
 562         char const *str_details1 = "", *str_details2= "";
 563         REQUEST *request;
 564
 565         /*
 566          *      Don't print this out in the normal course of
 567          *      operations.
 568          */
 569         if (debug_flag == 0) {
 570                 return;
 571         }
 572
 573         str_write_p = tls_session->info.origin ? ">>>" : "<<<";
 574
 575         switch (tls_session->info.version)
 576         {
 577         case SSL2_VERSION:
 578                 str_version = "SSL 2.0";
 579                 break;
 580         case SSL3_VERSION:
 581                 str_version = "SSL 3.0 ";
 582                 break;
 583         case TLS1_VERSION:
 584                 str_version = "TLS 1.0 ";
 585                 break;
 586         default:
 587                 str_version = "Unknown TLS version";
 588                 break;
 589         }
 590
 591         if (tls_session->info.version == SSL3_VERSION ||
 592             tls_session->info.version == TLS1_VERSION) {
 593                 switch (tls_session->info.content_type) {
 594                 case SSL3_RT_CHANGE_CIPHER_SPEC:
 595                         str_content_type = "ChangeCipherSpec";
 596                         break;
 597                 case SSL3_RT_ALERT:
 598                         str_content_type = "Alert";
 599                         break;
 600                 case SSL3_RT_HANDSHAKE:
 601                         str_content_type = "Handshake";
 602                         break;
 603                 case SSL3_RT_APPLICATION_DATA:
 604                         str_content_type = "ApplicationData";
 605                         break;
 606                 default:
 607                         str_content_type = "UnknownContentType";
 608                         break;
 609                 }
 610
 611                 if (tls_session->info.content_type == SSL3_RT_ALERT) {
 612                         str_details1 = ", ???";
 613
 614                         if (tls_session->info.record_len == 2) {
 615
 616                                 switch (tls_session->info.alert_level) {
 617                                 case SSL3_AL_WARNING:
 618                                         str_details1 = ", warning";
 619                                         break;
 620                                 case SSL3_AL_FATAL:
 621                                         str_details1 = ", fatal";
 622                                         break;
 623                                 }
 624
 625                                 str_details2 = " ???";
 626                                 switch (tls_session->info.alert_description) {
 627                                 case SSL3_AD_CLOSE_NOTIFY:
 628                                         str_details2 = " close_notify";
 629                                         break;
 630                                 case SSL3_AD_UNEXPECTED_MESSAGE:
 631                                         str_details2 = " unexpected_message";
 632                                         break;
 633                                 case SSL3_AD_BAD_RECORD_MAC:
 634                                         str_details2 = " bad_record_mac";
 635                                         break;
 636                                 case TLS1_AD_DECRYPTION_FAILED:
 637                                         str_details2 = " decryption_failed";
 638                                         break;
 639                                 case TLS1_AD_RECORD_OVERFLOW:
 640                                         str_details2 = " record_overflow";
 641                                         break;
 642                                 case SSL3_AD_DECOMPRESSION_FAILURE:
 643                                         str_details2 = " decompression_failure";
 644                                         break;
 645                                 case SSL3_AD_HANDSHAKE_FAILURE:
 646                                         str_details2 = " handshake_failure";
 647                                         break;
 648                                 case SSL3_AD_BAD_CERTIFICATE:
 649                                         str_details2 = " bad_certificate";
 650                                         break;
 651                                 case SSL3_AD_UNSUPPORTED_CERTIFICATE:
 652                                         str_details2 = " unsupported_certificate";
 653                                         break;
 654                                 case SSL3_AD_CERTIFICATE_REVOKED:
 655                                         str_details2 = " certificate_revoked";
 656                                         break;
 657                                 case SSL3_AD_CERTIFICATE_EXPIRED:
 658                                         str_details2 = " certificate_expired";
 659                                         break;
 660                                 case SSL3_AD_CERTIFICATE_UNKNOWN:
 661                                         str_details2 = " certificate_unknown";
 662                                         break;
 663                                 case SSL3_AD_ILLEGAL_PARAMETER:
 664                                         str_details2 = " illegal_parameter";
 665                                         break;
 666                                 case TLS1_AD_UNKNOWN_CA:
 667                                         str_details2 = " unknown_ca";
 668                                         break;
 669                                 case TLS1_AD_ACCESS_DENIED:
 670                                         str_details2 = " access_denied";
 671                                         break;
 672                                 case TLS1_AD_DECODE_ERROR:
 673                                         str_details2 = " decode_error";
 674                                         break;
 675                                 case TLS1_AD_DECRYPT_ERROR:
 676                                         str_details2 = " decrypt_error";
 677                                         break;
 678                                 case TLS1_AD_EXPORT_RESTRICTION:
 679                                         str_details2 = " export_restriction";
 680                                         break;
 681                                 case TLS1_AD_PROTOCOL_VERSION:
 682                                         str_details2 = " protocol_version";
 683                                         break;
 684                                 case TLS1_AD_INSUFFICIENT_SECURITY:
 685                                         str_details2 = " insufficient_security";
 686                                         break;
 687                                 case TLS1_AD_INTERNAL_ERROR:
 688                                         str_details2 = " internal_error";
 689                                         break;
 690                                 case TLS1_AD_USER_CANCELLED:
 691                                         str_details2 = " user_canceled";
 692                                         break;
 693                                 case TLS1_AD_NO_RENEGOTIATION:
 694                                         str_details2 = " no_renegotiation";
 695                                         break;
 696                                 }
 697                         }
 698                 }
 699
 700                 if (tls_session->info.content_type == SSL3_RT_HANDSHAKE) {
 701                         str_details1 = "???";
 702
 703                         if (tls_session->info.record_len > 0)
 704                         switch (tls_session->info.handshake_type)
 705                         {
 706                         case SSL3_MT_HELLO_REQUEST:
 707                                 str_details1 = ", HelloRequest";
 708                                 break;
 709                         case SSL3_MT_CLIENT_HELLO:
 710                                 str_details1 = ", ClientHello";
 711                                 break;
 712                         case SSL3_MT_SERVER_HELLO:
 713                                 str_details1 = ", ServerHello";
 714                                 break;
 715                         case SSL3_MT_CERTIFICATE:
 716                                 str_details1 = ", Certificate";
 717                                 break;
 718                         case SSL3_MT_SERVER_KEY_EXCHANGE:
 719                                 str_details1 = ", ServerKeyExchange";
 720                                 break;
 721                         case SSL3_MT_CERTIFICATE_REQUEST:
 722                                 str_details1 = ", CertificateRequest";
 723                                 break;
 724                         case SSL3_MT_SERVER_DONE:
 725                                 str_details1 = ", ServerHelloDone";
 726                                 break;
 727                         case SSL3_MT_CERTIFICATE_VERIFY:
 728                                 str_details1 = ", CertificateVerify";
 729                                 break;
 730                         case SSL3_MT_CLIENT_KEY_EXCHANGE:
 731                                 str_details1 = ", ClientKeyExchange";
 732                                 break;
 733                         case SSL3_MT_FINISHED:
 734                                 str_details1 = ", Finished";
 735                                 break;
 736                         }
 737                 }
 738         }
 739
 740         snprintf(tls_session->info.info_description,
 741                  sizeof(tls_session->info.info_description),
 742                  "%s %s%s [length %04lx]%s%s\n",
 743                  str_write_p, str_version, str_content_type,
 744                  (unsigned long)tls_session->info.record_len,
 745                  str_details1, str_details2);
 746
 747         request = SSL_get_ex_data(tls_session->ssl, FR_TLS_EX_INDEX_REQUEST);
 748
 749         RDEBUG2("%s\n", tls_session->info.info_description);
 750 }
 751
 752 static CONF_PARSER cache_config[] = {
 753         { "enable", PW_TYPE_BOOLEAN,
 754           offsetof(fr_tls_server_conf_t, session_cache_enable), NULL, "no" },
 755         { "lifetime", PW_TYPE_INTEGER,
 756           offsetof(fr_tls_server_conf_t, session_timeout), NULL, "24" },
 757         { "max_entries", PW_TYPE_INTEGER,
 758           offsetof(fr_tls_server_conf_t, session_cache_size), NULL, "255" },
 759         { "name", PW_TYPE_STRING_PTR,
 760           offsetof(fr_tls_server_conf_t, session_id_name), NULL, NULL},
 761         { "persist_dir", PW_TYPE_STRING_PTR,
 762           offsetof(fr_tls_server_conf_t, session_cache_path), NULL, NULL},
 763         { NULL, -1, 0, NULL, NULL }        /* end the list */
 764 };
 765
 766 static CONF_PARSER verify_config[] = {
 767         { "tmpdir", PW_TYPE_STRING_PTR,
 768           offsetof(fr_tls_server_conf_t, verify_tmp_dir), NULL, NULL},
 769         { "client", PW_TYPE_STRING_PTR,
 770           offsetof(fr_tls_server_conf_t, verify_client_cert_cmd), NULL, NULL},
 771         { NULL, -1, 0, NULL, NULL }        /* end the list */
 772 };
 773
 774 #ifdef HAVE_OPENSSL_OCSP_H
 775 static CONF_PARSER ocsp_config[] = {
 776         { "enable", PW_TYPE_BOOLEAN,
 777           offsetof(fr_tls_server_conf_t, ocsp_enable), NULL, "no"},
 778         { "override_cert_url", PW_TYPE_BOOLEAN,
 779           offsetof(fr_tls_server_conf_t, ocsp_override_url), NULL, "no"},
 780         { "url", PW_TYPE_STRING_PTR,
 781           offsetof(fr_tls_server_conf_t, ocsp_url), NULL, NULL },
 782         { "use_nonce", PW_TYPE_BOOLEAN,
 783           offsetof(fr_tls_server_conf_t, ocsp_use_nonce), NULL, "yes"},
 784         { "timeout", PW_TYPE_INTEGER,
 785           offsetof(fr_tls_server_conf_t, ocsp_timeout), NULL, "yes"},
 786         { "softfail", PW_TYPE_BOOLEAN,
 787           offsetof(fr_tls_server_conf_t, ocsp_softfail), NULL, "yes"},
 788         { NULL, -1, 0, NULL, NULL }        /* end the list */
 789 };
 790 #endif
 791
 792 static CONF_PARSER tls_server_config[] = {
 793         { "rsa_key_exchange", PW_TYPE_BOOLEAN,
 794           offsetof(fr_tls_server_conf_t, rsa_key), NULL, "no" },
 795         { "dh_key_exchange", PW_TYPE_BOOLEAN,
 796           offsetof(fr_tls_server_conf_t, dh_key), NULL, "yes" },
 797         { "rsa_key_length", PW_TYPE_INTEGER,
 798           offsetof(fr_tls_server_conf_t, rsa_key_length), NULL, "512" },
 799         { "dh_key_length", PW_TYPE_INTEGER,
 800           offsetof(fr_tls_server_conf_t, dh_key_length), NULL, "512" },
 801         { "verify_depth", PW_TYPE_INTEGER,
 802           offsetof(fr_tls_server_conf_t, verify_depth), NULL, "0" },
 803         { "CA_path", PW_TYPE_FILENAME,
 804           offsetof(fr_tls_server_conf_t, ca_path), NULL, NULL },
 805         { "pem_file_type", PW_TYPE_BOOLEAN,
 806           offsetof(fr_tls_server_conf_t, file_type), NULL, "yes" },
 807         { "private_key_file", PW_TYPE_FILENAME,
 808           offsetof(fr_tls_server_conf_t, private_key_file), NULL, NULL },
 809         { "certificate_file", PW_TYPE_FILENAME,
 810           offsetof(fr_tls_server_conf_t, certificate_file), NULL, NULL },
 811         { "CA_file", PW_TYPE_FILENAME,
 812           offsetof(fr_tls_server_conf_t, ca_file), NULL, NULL },
 813         { "private_key_password", PW_TYPE_STRING_PTR,
 814           offsetof(fr_tls_server_conf_t, private_key_password), NULL, NULL },
 815 #ifdef PSK_MAX_IDENTITY_LEN
 816         { "psk_identity", PW_TYPE_STRING_PTR,
 817           offsetof(fr_tls_server_conf_t, psk_identity), NULL, NULL },
 818         { "psk_hexphrase", PW_TYPE_STRING_PTR,
 819           offsetof(fr_tls_server_conf_t, psk_password), NULL, NULL },
 820 #endif
 821         { "dh_file", PW_TYPE_STRING_PTR,
 822           offsetof(fr_tls_server_conf_t, dh_file), NULL, NULL },
 823         { "random_file", PW_TYPE_STRING_PTR,
 824           offsetof(fr_tls_server_conf_t, random_file), NULL, NULL },
 825         { "fragment_size", PW_TYPE_INTEGER,
 826           offsetof(fr_tls_server_conf_t, fragment_size), NULL, "1024" },
 827         { "include_length", PW_TYPE_BOOLEAN,
 828           offsetof(fr_tls_server_conf_t, include_length), NULL, "yes" },
 829         { "check_crl", PW_TYPE_BOOLEAN,
 830           offsetof(fr_tls_server_conf_t, check_crl), NULL, "no"},
 831         { "allow_expired_crl", PW_TYPE_BOOLEAN,
 832           offsetof(fr_tls_server_conf_t, allow_expired_crl), NULL, NULL},
 833         { "check_cert_cn", PW_TYPE_STRING_PTR,
 834           offsetof(fr_tls_server_conf_t, check_cert_cn), NULL, NULL},
 835         { "cipher_list", PW_TYPE_STRING_PTR,
 836           offsetof(fr_tls_server_conf_t, cipher_list), NULL, NULL},
 837         { "check_cert_issuer", PW_TYPE_STRING_PTR,
 838           offsetof(fr_tls_server_conf_t, check_cert_issuer), NULL, NULL},
 839         { "make_cert_command", PW_TYPE_STRING_PTR,
 840           offsetof(fr_tls_server_conf_t, make_cert_command), NULL, NULL},
 841         { "require_client_cert", PW_TYPE_BOOLEAN,
 842           offsetof(fr_tls_server_conf_t, require_client_cert), NULL, NULL },
 843
 844 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
 845 #ifndef OPENSSL_NO_ECDH
 846         { "ecdh_curve", PW_TYPE_STRING_PTR,
 847           offsetof(fr_tls_server_conf_t, ecdh_curve), NULL, "prime256v1"},
 848 #endif
 849 #endif
 850
 851         { "cache", PW_TYPE_SUBSECTION, 0, NULL, (void const *) cache_config },
 852
 853         { "verify", PW_TYPE_SUBSECTION, 0, NULL, (void const *) verify_config },
 854
 855 #ifdef HAVE_OPENSSL_OCSP_H
 856         { "ocsp", PW_TYPE_SUBSECTION, 0, NULL, (void const *) ocsp_config },
 857 #endif
 858
 859         { NULL, -1, 0, NULL, NULL }        /* end the list */
 860 };
 861
 862
 863 static CONF_PARSER tls_client_config[] = {
 864         { "rsa_key_exchange", PW_TYPE_BOOLEAN,
 865           offsetof(fr_tls_server_conf_t, rsa_key), NULL, "no" },
 866         { "dh_key_exchange", PW_TYPE_BOOLEAN,
 867           offsetof(fr_tls_server_conf_t, dh_key), NULL, "yes" },
 868         { "rsa_key_length", PW_TYPE_INTEGER,
 869           offsetof(fr_tls_server_conf_t, rsa_key_length), NULL, "512" },
 870         { "dh_key_length", PW_TYPE_INTEGER,
 871           offsetof(fr_tls_server_conf_t, dh_key_length), NULL, "512" },
 872         { "verify_depth", PW_TYPE_INTEGER,
 873           offsetof(fr_tls_server_conf_t, verify_depth), NULL, "0" },
 874         { "CA_path", PW_TYPE_FILENAME,
 875           offsetof(fr_tls_server_conf_t, ca_path), NULL, NULL },
 876         { "pem_file_type", PW_TYPE_BOOLEAN,
 877           offsetof(fr_tls_server_conf_t, file_type), NULL, "yes" },
 878         { "private_key_file", PW_TYPE_FILENAME,
 879           offsetof(fr_tls_server_conf_t, private_key_file), NULL, NULL },
 880         { "certificate_file", PW_TYPE_FILENAME,
 881           offsetof(fr_tls_server_conf_t, certificate_file), NULL, NULL },
 882         { "CA_file", PW_TYPE_FILENAME,
 883           offsetof(fr_tls_server_conf_t, ca_file), NULL, NULL },
 884         { "private_key_password", PW_TYPE_STRING_PTR,
 885           offsetof(fr_tls_server_conf_t, private_key_password), NULL, NULL },
 886         { "dh_file", PW_TYPE_STRING_PTR,
 887           offsetof(fr_tls_server_conf_t, dh_file), NULL, NULL },
 888         { "random_file", PW_TYPE_STRING_PTR,
 889           offsetof(fr_tls_server_conf_t, random_file), NULL, NULL },
 890         { "fragment_size", PW_TYPE_INTEGER,
 891           offsetof(fr_tls_server_conf_t, fragment_size), NULL, "1024" },
 892         { "include_length", PW_TYPE_BOOLEAN,
 893           offsetof(fr_tls_server_conf_t, include_length), NULL, "yes" },
 894         { "check_crl", PW_TYPE_BOOLEAN,
 895           offsetof(fr_tls_server_conf_t, check_crl), NULL, "no"},
 896         { "check_cert_cn", PW_TYPE_STRING_PTR,
 897           offsetof(fr_tls_server_conf_t, check_cert_cn), NULL, NULL},
 898         { "cipher_list", PW_TYPE_STRING_PTR,
 899           offsetof(fr_tls_server_conf_t, cipher_list), NULL, NULL},
 900         { "check_cert_issuer", PW_TYPE_STRING_PTR,
 901           offsetof(fr_tls_server_conf_t, check_cert_issuer), NULL, NULL},
 902
 903 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
 904 #ifndef OPENSSL_NO_ECDH
 905         { "ecdh_curve", PW_TYPE_STRING_PTR,
 906           offsetof(fr_tls_server_conf_t, ecdh_curve), NULL, "prime256v1"},
 907 #endif
 908 #endif
 909
 910         { NULL, -1, 0, NULL, NULL }        /* end the list */
 911 };
 912
 913
 914 /*
 915  *      TODO: Check for the type of key exchange * like conf->dh_key
 916  */
 917 static int load_dh_params(SSL_CTX *ctx, char *file)
 918 {
 919         DH *dh = NULL;
 920         BIO *bio;
 921
 922         if ((bio = BIO_new_file(file, "r")) == NULL) {
 923                 ERROR("rlm_eap_tls: Unable to open DH file - %s", file);
 924                 return -1;
 925         }
 926
 927         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
 928         BIO_free(bio);
 929         if (!dh) {
 930                 DEBUG2W("rlm_eap_tls: Unable to set DH parameters.  DH cipher suites may not work!");
 931                 DEBUG2W("Fix this by running the OpenSSL command listed in eap.conf");
 932                 return 0;
 933         }
 934
 935         if (SSL_CTX_set_tmp_dh(ctx, dh) < 0) {
 936                 ERROR("rlm_eap_tls: Unable to set DH parameters");
 937                 DH_free(dh);
 938                 return -1;
 939         }
 940
 941         DH_free(dh);
 942         return 0;
 943 }
 944
 945
 946 /*
 947  *      Generate ephemeral RSA keys.
 948  */
 949 static int generate_eph_rsa_key(SSL_CTX *ctx)
 950 {
 951         RSA *rsa;
 952
 953         rsa = RSA_generate_key(512, RSA_F4, NULL, NULL);
 954
 955         if (!SSL_CTX_set_tmp_rsa(ctx, rsa)) {
 956                 ERROR("rlm_eap_tls: Couldn't set ephemeral RSA key");
 957                 return -1;
 958         }
 959
 960         RSA_free(rsa);
 961         return 0;
 962 }
 963
 964 /* index we use to store cached session VPs
 965  * needs to be dynamic so we can supply a "free" function
 966  */
 967 static int FR_TLS_EX_INDEX_VPS = -1;
 968
 969 /*
 970  *      Print debugging messages, and free data.
 971  *
 972  *      FIXME: Write sessions to some long-term storage, so that
 973  *             session resumption can still occur after the server
 974  *             restarts.
 975  */
 976 #define MAX_SESSION_SIZE (256)
 977
 978 static void cbtls_remove_session(SSL_CTX *ctx, SSL_SESSION *sess)
 979 {
 980         size_t size;
 981         char buffer[2 * MAX_SESSION_SIZE + 1];
 982         fr_tls_server_conf_t *conf;
 983
 984         size = sess->session_id_length;
 985         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
 986
 987         fr_bin2hex(sess->session_id, buffer, size);
 988
 989         DEBUG2("  SSL: Removing session %s from the cache", buffer);
 990         conf = (fr_tls_server_conf_t *)SSL_CTX_get_app_data(ctx);
 991         if (conf && conf->session_cache_path) {
 992                 int rv;
 993                 char filename[256];
 994
 995                 /* remove session and any cached VPs */
 996                 rv = snprintf(filename, sizeof(filename), "%s%c%s.asn1",
 997                         conf->session_cache_path, FR_DIR_SEP, buffer
 998                         );
 999                 rv = unlink(filename);
1000                 if (rv != 0) {
1001                         DEBUG2("  SSL: could not remove persisted session file %s: %s", filename, strerror(errno));
1002                 }
1003                 /* VPs might be absent; might not have been written to disk yet */
1004                 rv = snprintf(filename, sizeof(filename), "%s%c%s.vps",
1005                         conf->session_cache_path, FR_DIR_SEP, buffer
1006                         );
1007                 rv = unlink(filename);
1008         }
1009
1010         return;
1011 }
1012
1013 static int cbtls_new_session(SSL *ssl, SSL_SESSION *sess)
1014 {
1015         size_t size;
1016         char buffer[2 * MAX_SESSION_SIZE + 1];
1017         fr_tls_server_conf_t *conf;
1018         unsigned char *sess_blob = NULL;
1019
1020         size = sess->session_id_length;
1021         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
1022
1023         fr_bin2hex(sess->session_id, buffer, size);
1024
1025         DEBUG2("  SSL: adding session %s to cache", buffer);
1026
1027         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1028         if (conf && conf->session_cache_path) {
1029                 int fd, rv, todo, blob_len;
1030                 char filename[256];
1031                 unsigned char *p;
1032
1033                 /* find out what length data we need */
1034                 blob_len = i2d_SSL_SESSION(sess, NULL);
1035                 if (blob_len < 1) {
1036                         /* something went wrong */
1037                         DEBUG2("  SSL: could not find buffer length to persist session");
1038                         return 0;
1039                 }
1040
1041                 /* alloc and convert to ASN.1 */
1042                 sess_blob = talloc_array(conf, unsigned char, blob_len);
1043                 if (!sess_blob) {
1044                         DEBUG2("  SSL: could not allocate buffer len=%d to persist session", blob_len);
1045                         return 0;
1046                 }
1047                 /* openssl mutates &p */
1048                 p = sess_blob;
1049                 rv = i2d_SSL_SESSION(sess, &p);
1050                 if (rv != blob_len) {
1051                         DEBUG2("  SSL: could not persist session");
1052                         goto error;
1053                 }
1054
1055                 /* open output file */
1056                 rv = snprintf(filename, sizeof(filename), "%s%c%s.asn1",
1057                               conf->session_cache_path, FR_DIR_SEP, buffer);
1058                 fd = open(filename, O_RDWR|O_CREAT|O_EXCL, 0600);
1059                 if (fd < 0) {
1060                         DEBUG2("  SSL: could not open session file %s: %s", filename, strerror(errno));
1061                         goto error;
1062                 }
1063
1064                 todo = blob_len;
1065                 p = sess_blob;
1066                 while (todo > 0) {
1067                         rv = write(fd, p, todo);
1068                         if (rv < 1) {
1069                                 DEBUG2("  SSL: failed writing session: %s", strerror(errno));
1070                                 close(fd);
1071                                 goto error;
1072                         }
1073                         p += rv;
1074                         todo -= rv;
1075                 }
1076                 close(fd);
1077                 DEBUG2("  SSL: wrote session %s to %s len=%d", buffer, filename, blob_len);
1078         }
1079
1080 error:
1081         if (sess_blob) talloc_free(sess_blob);
1082
1083         return 0;
1084 }
1085
1086 static SSL_SESSION *cbtls_get_session(SSL *ssl,
1087                                       unsigned char *data, int len,
1088                                       int *copy)
1089 {
1090         size_t size;
1091         char buffer[2 * MAX_SESSION_SIZE + 1];
1092         fr_tls_server_conf_t *conf;
1093
1094         SSL_SESSION *sess = NULL;
1095         unsigned char *sess_data = NULL;
1096         PAIR_LIST *pairlist = NULL;
1097
1098         size = len;
1099         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
1100
1101         fr_bin2hex(data, buffer, size);
1102
1103         DEBUG2("  SSL: Client requested cached session %s", buffer);
1104
1105         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1106         if (conf && conf->session_cache_path) {
1107                 int rv, fd, todo;
1108                 char filename[256];
1109                 unsigned char *p;
1110                 struct stat st;
1111                 VALUE_PAIR *vp;
1112
1113                 /* read in the cached VPs from the .vps file */
1114                 rv = snprintf(filename, sizeof(filename), "%s%c%s.vps",
1115                         conf->session_cache_path, FR_DIR_SEP, buffer
1116                         );
1117                 rv = pairlist_read(NULL, filename, &pairlist, 1);
1118                 if (rv < 0) {
1119                         /* not safe to un-persist a session w/o VPs */
1120                         DEBUG2("  SSL: could not load persisted VPs for session %s", buffer);
1121                         goto err;
1122                 }
1123
1124                 /* load the actual SSL session */
1125                 rv = snprintf(filename, sizeof(filename), "%s%c%s.asn1",
1126                         conf->session_cache_path, FR_DIR_SEP, buffer
1127                         );
1128                 fd = open(filename, O_RDONLY);
1129                 if (fd == -1) {
1130                         DEBUG2("  SSL: could not find persisted session file %s: %s", filename, strerror(errno));
1131                         goto err;
1132                 }
1133
1134                 rv = fstat(fd, &st);
1135                 if (rv == -1) {
1136                         DEBUG2("  SSL: could not stat persisted session file %s: %s", filename, strerror(errno));
1137                         close(fd);
1138                         goto err;
1139                 }
1140
1141                 sess_data = talloc_array(NULL, unsigned char, st.st_size);
1142                 if (!sess_data) {
1143                   DEBUG2("  SSL: could not alloc buffer for persisted session len=%d", (int) st.st_size);
1144                         close(fd);
1145                         goto err;
1146                 }
1147
1148                 p = sess_data;
1149                 todo = st.st_size;
1150                 while (todo > 0) {
1151                         rv = read(fd, p, todo);
1152                         if (rv < 1) {
1153                                 DEBUG2("  SSL: could not read from persisted session: %s", strerror(errno));
1154                                 close(fd);
1155                                 goto err;
1156                         }
1157                         todo -= rv;
1158                         p += rv;
1159                 }
1160                 close(fd);
1161
1162                 /* openssl mutates &p */
1163                 p = sess_data;
1164                 sess = d2i_SSL_SESSION(NULL, (unsigned char const **)(void **) &p, st.st_size);
1165
1166                 if (!sess) {
1167                         DEBUG2("  SSL: OpenSSL failed to load persisted session: %s", ERR_error_string(ERR_get_error(), NULL));
1168                         goto err;
1169                 }
1170
1171                 /* cache the VPs into the session */
1172                 vp = paircopy(NULL, pairlist->reply);
1173                 SSL_SESSION_set_ex_data(sess, FR_TLS_EX_INDEX_VPS, vp);
1174                 DEBUG2("  SSL: Successfully restored session %s", buffer);
1175         }
1176 err:
1177         if (sess_data) talloc_free(sess_data);
1178         if (pairlist) pairlist_free(&pairlist);
1179
1180         *copy = 0;
1181         return sess;
1182 }
1183
1184 #ifdef HAVE_OPENSSL_OCSP_H
1185 /*
1186  * This function extracts the OCSP Responder URL
1187  * from an existing x509 certificate.
1188  */
1189 static int ocsp_parse_cert_url(X509 *cert, char **phost, char **pport,
1190                                char **ppath, int *pssl)
1191 {
1192         int i;
1193
1194         AUTHORITY_INFO_ACCESS *aia;
1195         ACCESS_DESCRIPTION *ad;
1196
1197         aia = X509_get_ext_d2i(cert, NID_info_access, NULL, NULL);
1198
1199         for (i = 0; i < sk_ACCESS_DESCRIPTION_num(aia); i++) {
1200                 ad = sk_ACCESS_DESCRIPTION_value(aia, 0);
1201                 if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) {
1202                         if (ad->location->type == GEN_URI) {
1203                           if(OCSP_parse_url((char *) ad->location->d.ia5->data,
1204                                                   phost, pport, ppath, pssl))
1205                                         return 1;
1206                         }
1207                 }
1208         }
1209         return 0;
1210 }
1211
1212 /*
1213  * This function sends a OCSP request to a defined OCSP responder
1214  * and checks the OCSP response for correctness.
1215  */
1216
1217 /* Maximum leeway in validity period: default 5 minutes */
1218 #define MAX_VALIDITY_PERIOD     (5 * 60)
1219
1220 static int ocsp_check(X509_STORE *store, X509 *issuer_cert, X509 *client_cert,
1221                       fr_tls_server_conf_t *conf)
1222 {
1223         OCSP_CERTID *certid;
1224         OCSP_REQUEST *req;
1225         OCSP_RESPONSE *resp = NULL;
1226         OCSP_BASICRESP *bresp = NULL;
1227         char *host = NULL;
1228         char *port = NULL;
1229         char *path = NULL;
1230         int use_ssl = -1;
1231         long nsec = MAX_VALIDITY_PERIOD, maxage = -1;
1232         BIO *cbio, *bio_out;
1233         int ocsp_ok = 0;
1234         int status ;
1235         ASN1_GENERALIZEDTIME *rev, *thisupd, *nextupd;
1236         int reason;
1237 #if OPENSSL_VERSION_NUMBER >= 0x1000003f
1238         OCSP_REQ_CTX *ctx;
1239         int rc;
1240         struct timeval now;
1241         struct timeval when;
1242 #endif
1243
1244         /*
1245          * Create OCSP Request
1246          */
1247         certid = OCSP_cert_to_id(NULL, client_cert, issuer_cert);
1248         req = OCSP_REQUEST_new();
1249         OCSP_request_add0_id(req, certid);
1250         if(conf->ocsp_use_nonce) {
1251                 OCSP_request_add1_nonce(req, NULL, 8);
1252         }
1253
1254         /*
1255          * Send OCSP Request and get OCSP Response
1256          */
1257
1258         /* Get OCSP responder URL */
1259         if(conf->ocsp_override_url) {
1260                 OCSP_parse_url(conf->ocsp_url, &host, &port, &path, &use_ssl);
1261         }
1262         else {
1263                 ocsp_parse_cert_url(client_cert, &host, &port, &path, &use_ssl);
1264         }
1265
1266         if (!host || !port || !path) {
1267                 DEBUG2("[ocsp] - Host / port / path missing.  Not doing OCSP.");
1268                 ocsp_ok = 2;
1269                 goto ocsp_skip;
1270         }
1271
1272         DEBUG2("[ocsp] --> Responder URL = http://%s:%s%s", host, port, path);
1273
1274         /* Setup BIO socket to OCSP responder */
1275         cbio = BIO_new_connect(host);
1276
1277         bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
1278
1279         BIO_set_conn_port(cbio, port);
1280 #if OPENSSL_VERSION_NUMBER < 0x1000003f
1281         BIO_do_connect(cbio);
1282
1283         /* Send OCSP request and wait for response */
1284         resp = OCSP_sendreq_bio(cbio, path, req);
1285         if (!resp) {
1286                 ERROR("Error: Couldn't get OCSP response");
1287                 ocsp_ok = 2;
1288                 goto ocsp_end;
1289         }
1290 #else
1291         if (conf->ocsp_timeout)
1292                 BIO_set_nbio(cbio, 1);
1293
1294         rc = BIO_do_connect(cbio);
1295         if ((rc <= 0) && ((!conf->ocsp_timeout) || !BIO_should_retry(cbio))) {
1296                 ERROR("Error: Couldn't connect to OCSP responder");
1297                 ocsp_ok = 2;
1298                 goto ocsp_end;
1299         }
1300
1301         ctx = OCSP_sendreq_new(cbio, path, req, -1);
1302         if (!ctx) {
1303                 ERROR("Error: Couldn't send OCSP request");
1304                 ocsp_ok = 2;
1305                 goto ocsp_end;
1306         }
1307
1308         gettimeofday(&when, NULL);
1309         when.tv_sec += conf->ocsp_timeout;
1310
1311         do {
1312                 rc = OCSP_sendreq_nbio(&resp, ctx);
1313                 if (conf->ocsp_timeout) {
1314                         gettimeofday(&now, NULL);
1315                         if (!timercmp(&now, &when, <))
1316                                 break;
1317                 }
1318         } while ((rc == -1) && BIO_should_retry(cbio));
1319
1320         if (conf->ocsp_timeout && (rc == -1) && BIO_should_retry(cbio)) {
1321                 ERROR("Error: OCSP response timed out");
1322                 ocsp_ok = 2;
1323                 goto ocsp_end;
1324         }
1325
1326         OCSP_REQ_CTX_free(ctx);
1327
1328         if (rc == 0) {
1329                 ERROR("Error: Couldn't get OCSP response");
1330                 ocsp_ok = 2;
1331                 goto ocsp_end;
1332         }
1333 #endif
1334
1335         /* Verify OCSP response status */
1336         status = OCSP_response_status(resp);
1337         DEBUG2("[ocsp] --> Response status: %s",OCSP_response_status_str(status));
1338         if(status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
1339                 ERROR("Error: OCSP response status: %s", OCSP_response_status_str(status));
1340                 goto ocsp_end;
1341         }
1342         bresp = OCSP_response_get1_basic(resp);
1343         if(conf->ocsp_use_nonce && OCSP_check_nonce(req, bresp)!=1) {
1344                 ERROR("Error: OCSP response has wrong nonce value");
1345                 goto ocsp_end;
1346         }
1347         if(OCSP_basic_verify(bresp, NULL, store, 0)!=1){
1348                 ERROR("Error: Couldn't verify OCSP basic response");
1349                 goto ocsp_end;
1350         }
1351
1352         /*      Verify OCSP cert status */
1353         if(!OCSP_resp_find_status(bresp, certid, &status, &reason,
1354                                                       &rev, &thisupd, &nextupd)) {
1355                 ERROR("ERROR: No Status found.\n");
1356                 goto ocsp_end;
1357         }
1358
1359         if (!OCSP_check_validity(thisupd, nextupd, nsec, maxage)) {
1360                 BIO_puts(bio_out, "WARNING: Status times invalid.\n");
1361                 ERR_print_errors(bio_out);
1362                 goto ocsp_end;
1363         }
1364         BIO_puts(bio_out, "\tThis Update: ");
1365         ASN1_GENERALIZEDTIME_print(bio_out, thisupd);
1366         BIO_puts(bio_out, "\n");
1367         if (nextupd) {
1368                 BIO_puts(bio_out, "\tNext Update: ");
1369                 ASN1_GENERALIZEDTIME_print(bio_out, nextupd);
1370                 BIO_puts(bio_out, "\n");
1371         }
1372
1373         switch (status) {
1374         case V_OCSP_CERTSTATUS_GOOD:
1375                 DEBUG2("[oscp] --> Cert status: good");
1376                 ocsp_ok = 1;
1377                 break;
1378
1379         default:
1380                 /* REVOKED / UNKNOWN */
1381                 DEBUG2("[ocsp] --> Cert status: %s",OCSP_cert_status_str(status));
1382                 if (reason != -1)
1383                         DEBUG2("[ocsp] --> Reason: %s", OCSP_crl_reason_str(reason));
1384                 BIO_puts(bio_out, "\tRevocation Time: ");
1385                 ASN1_GENERALIZEDTIME_print(bio_out, rev);
1386                 BIO_puts(bio_out, "\n");
1387                 break;
1388         }
1389
1390 ocsp_end:
1391         /* Free OCSP Stuff */
1392         OCSP_REQUEST_free(req);
1393         OCSP_RESPONSE_free(resp);
1394         free(host);
1395         free(port);
1396         free(path);
1397         BIO_free_all(cbio);
1398         OCSP_BASICRESP_free(bresp);
1399
1400  ocsp_skip:
1401         switch (ocsp_ok) {
1402         case 1:
1403                 DEBUG2("[ocsp] --> Certificate is valid!");
1404                 break;
1405         case 2:
1406                 if (conf->ocsp_softfail) {
1407                         DEBUG2("[ocsp] --> Unable to check certificate; assuming valid.");
1408                         DEBUG2("[ocsp] --> Warning! This may be insecure.");
1409                         ocsp_ok = 1;
1410                 } else {
1411                         DEBUG2("[ocsp] --> Unable to check certificate; failing!");
1412                         ocsp_ok = 0;
1413                 }
1414                 break;
1415         default:
1416                 DEBUG2("[ocsp] --> Certificate has been expired/revoked!");
1417                 break;
1418         }
1419
1420         return ocsp_ok;
1421 }
1422 #endif  /* HAVE_OPENSSL_OCSP_H */
1423
1424 /*
1425  *      For creating certificate attributes.
1426  */
1427 static char const *cert_attr_names[6][2] = {
1428   { "TLS-Client-Cert-Serial",           "TLS-Cert-Serial" },
1429   { "TLS-Client-Cert-Expiration",       "TLS-Cert-Expiration" },
1430   { "TLS-Client-Cert-Subject",          "TLS-Cert-Subject" },
1431   { "TLS-Client-Cert-Issuer",           "TLS-Cert-Issuer" },
1432   { "TLS-Client-Cert-Common-Name",      "TLS-Cert-Common-Name" },
1433   { "TLS-Client-Cert-Subject-Alt-Name-Email",   "TLS-Cert-Subject-Alt-Name-Email" }
1434 };
1435
1436 #define FR_TLS_SERIAL           (0)
1437 #define FR_TLS_EXPIRATION       (1)
1438 #define FR_TLS_SUBJECT          (2)
1439 #define FR_TLS_ISSUER           (3)
1440 #define FR_TLS_CN               (4)
1441 #define FR_TLS_SAN_EMAIL        (5)
1442
1443 /*
1444  *      Before trusting a certificate, you must make sure that the
1445  *      certificate is 'valid'. There are several steps that your
1446  *      application can take in determining if a certificate is
1447  *      valid. Commonly used steps are:
1448  *
1449  *      1.Verifying the certificate's signature, and verifying that
1450  *      the certificate has been issued by a trusted Certificate
1451  *      Authority.
1452  *
1453  *      2.Verifying that the certificate is valid for the present date
1454  *      (i.e. it is being presented within its validity dates).
1455  *
1456  *      3.Verifying that the certificate has not been revoked by its
1457  *      issuing Certificate Authority, by checking with respect to a
1458  *      Certificate Revocation List (CRL).
1459  *
1460  *      4.Verifying that the credentials presented by the certificate
1461  *      fulfill additional requirements specific to the application,
1462  *      such as with respect to access control lists or with respect
1463  *      to OCSP (Online Certificate Status Processing).
1464  *
1465  *      NOTE: This callback will be called multiple times based on the
1466  *      depth of the root certificate chain
1467  */
1468 int cbtls_verify(int ok, X509_STORE_CTX *ctx)
1469 {
1470         char subject[1024]; /* Used for the subject name */
1471         char issuer[1024]; /* Used for the issuer name */
1472         char common_name[1024];
1473         char cn_str[1024];
1474         char buf[64];
1475         X509 *client_cert;
1476         SSL *ssl;
1477         int err, depth, lookup, loc;
1478         fr_tls_server_conf_t *conf;
1479         int my_ok = ok;
1480         REQUEST *request;
1481         ASN1_INTEGER *sn = NULL;
1482         ASN1_TIME *asn_time = NULL;
1483         VALUE_PAIR **certs;
1484         char **identity;
1485 #ifdef HAVE_OPENSSL_OCSP_H
1486         X509_STORE *ocsp_store = NULL;
1487         X509 *issuer_cert;
1488 #endif
1489
1490         client_cert = X509_STORE_CTX_get_current_cert(ctx);
1491         err = X509_STORE_CTX_get_error(ctx);
1492         depth = X509_STORE_CTX_get_error_depth(ctx);
1493
1494         lookup = depth;
1495
1496         /*
1497          *      Log client/issuing cert.  If there's an error, log
1498          *      issuing cert.
1499          */
1500         if ((lookup > 1) && !my_ok) lookup = 1;
1501
1502         /*
1503          * Retrieve the pointer to the SSL of the connection currently treated
1504          * and the application specific data stored into the SSL object.
1505          */
1506         ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
1507         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1508         if (!conf) return 1;
1509
1510         request = (REQUEST *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
1511
1512         if (!request) return 1; /* FIXME: outbound TLS */
1513
1514         rad_assert(request != NULL);
1515         certs = (VALUE_PAIR **)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CERTS);
1516         rad_assert(certs != NULL);
1517         identity = (char **)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_IDENTITY);
1518 #ifdef HAVE_OPENSSL_OCSP_H
1519         ocsp_store = (X509_STORE *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_STORE);
1520 #endif
1521
1522         /*
1523          *      Get the Serial Number
1524          */
1525         buf[0] = '\0';
1526         sn = X509_get_serialNumber(client_cert);
1527
1528         /*
1529          *      For this next bit, we create the attributes *only* if
1530          *      we're at the client or issuing certificate, AND we
1531          *      have a user identity.  i.e. we don't create the
1532          *      attributes for RadSec connections.
1533          */
1534         if (identity &&
1535             (lookup <= 1) && sn && ((size_t) sn->length < (sizeof(buf) / 2))) {
1536                 char *p = buf;
1537                 int i;
1538
1539                 for (i = 0; i < sn->length; i++) {
1540                         sprintf(p, "%02x", (unsigned int)sn->data[i]);
1541                         p += 2;
1542                 }
1543                 pairmake(NULL, certs, cert_attr_names[FR_TLS_SERIAL][lookup], buf, T_OP_SET);
1544         }
1545
1546
1547         /*
1548          *      Get the Expiration Date
1549          */
1550         buf[0] = '\0';
1551         asn_time = X509_get_notAfter(client_cert);
1552         if (identity && (lookup <= 1) && asn_time &&
1553             (asn_time->length < (int) sizeof(buf))) {
1554                 memcpy(buf, (char*) asn_time->data, asn_time->length);
1555                 buf[asn_time->length] = '\0';
1556                 pairmake(NULL, certs, cert_attr_names[FR_TLS_EXPIRATION][lookup], buf, T_OP_SET);
1557         }
1558
1559         /*
1560          *      Get the Subject & Issuer
1561          */
1562         subject[0] = issuer[0] = '\0';
1563         X509_NAME_oneline(X509_get_subject_name(client_cert), subject,
1564                           sizeof(subject));
1565         subject[sizeof(subject) - 1] = '\0';
1566         if (identity && (lookup <= 1) && subject[0] &&
1567             (strlen(subject) < MAX_STRING_LEN)) {
1568                 pairmake(NULL, certs, cert_attr_names[FR_TLS_SUBJECT][lookup], subject, T_OP_SET);
1569         }
1570
1571         X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), issuer,
1572                           sizeof(issuer));
1573         issuer[sizeof(issuer) - 1] = '\0';
1574         if (identity && (lookup <= 1) && issuer[0] &&
1575             (strlen(issuer) < MAX_STRING_LEN)) {
1576                 pairmake(NULL, certs, cert_attr_names[FR_TLS_ISSUER][lookup], issuer, T_OP_SET);
1577         }
1578
1579         /*
1580          *      Get the Common Name, if there is a subject.
1581          */
1582         X509_NAME_get_text_by_NID(X509_get_subject_name(client_cert),
1583                                   NID_commonName, common_name, sizeof(common_name));
1584         common_name[sizeof(common_name) - 1] = '\0';
1585         if (identity && (lookup <= 1) && common_name[0] && subject[0] &&
1586             (strlen(common_name) < MAX_STRING_LEN)) {
1587                 pairmake(NULL, certs, cert_attr_names[FR_TLS_CN][lookup], common_name, T_OP_SET);
1588         }
1589
1590 #ifdef GEN_EMAIL
1591         /*
1592          *      Get the RFC822 Subject Alternative Name
1593          */
1594         loc = X509_get_ext_by_NID(client_cert, NID_subject_alt_name, 0);
1595         if (lookup <= 1 && loc >= 0) {
1596                 X509_EXTENSION *ext = NULL;
1597                 GENERAL_NAMES *names = NULL;
1598                 int i;
1599
1600                 if ((ext = X509_get_ext(client_cert, loc)) &&
1601                     (names = X509V3_EXT_d2i(ext))) {
1602                         for (i = 0; i < sk_GENERAL_NAME_num(names); i++) {
1603                                 GENERAL_NAME *name = sk_GENERAL_NAME_value(names, i);
1604
1605                                 switch (name->type) {
1606                                 case GEN_EMAIL:
1607                                         if (ASN1_STRING_length(name->d.rfc822Name) >= MAX_STRING_LEN)
1608                                                 break;
1609
1610                                         pairmake(NULL, certs, cert_attr_names[FR_TLS_SAN_EMAIL][lookup],
1611                                                  (char *) ASN1_STRING_data(name->d.rfc822Name), T_OP_SET);
1612                                         break;
1613                                 default:
1614                                         /* XXX TODO handle other SAN types */
1615                                         break;
1616                                 }
1617                         }
1618                 }
1619                 if (names != NULL)
1620                         sk_GENERAL_NAME_free(names);
1621         }
1622 #endif  /* GEN_EMAIL */
1623
1624         /*
1625          *      If the CRL has expired, that might still be OK.
1626          */
1627         if (!my_ok &&
1628             (conf->allow_expired_crl) &&
1629             (err == X509_V_ERR_CRL_HAS_EXPIRED)) {
1630                 my_ok = 1;
1631                 X509_STORE_CTX_set_error( ctx, 0 );
1632         }
1633
1634         if (!my_ok) {
1635                 char const *p = X509_verify_cert_error_string(err);
1636                 ERROR("--> verify error:num=%d:%s\n",err, p);
1637                 RDEBUGE("SSL says error %d : %s", err, p);
1638                 return my_ok;
1639         }
1640
1641         switch (ctx->error) {
1642
1643         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
1644                 ERROR("issuer= %s\n", issuer);
1645                 break;
1646         case X509_V_ERR_CERT_NOT_YET_VALID:
1647         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
1648                 ERROR("notBefore=");
1649 #if 0
1650                 ASN1_TIME_print(bio_err, X509_get_notBefore(ctx->current_cert));
1651 #endif
1652                 break;
1653         case X509_V_ERR_CERT_HAS_EXPIRED:
1654         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
1655                 ERROR("notAfter=");
1656 #if 0
1657                 ASN1_TIME_print(bio_err, X509_get_notAfter(ctx->current_cert));
1658 #endif
1659                 break;
1660         }
1661
1662         /*
1663          *      If we're at the actual client cert, apply additional
1664          *      checks.
1665          */
1666         if (depth == 0) {
1667                 /*
1668                  *      If the conf tells us to, check cert issuer
1669                  *      against the specified value and fail
1670                  *      verification if they don't match.
1671                  */
1672                 if (conf->check_cert_issuer &&
1673                     (strcmp(issuer, conf->check_cert_issuer) != 0)) {
1674                         radlog(L_AUTH, "rlm_eap_tls: Certificate issuer (%s) does not match specified value (%s)!", issuer, conf->check_cert_issuer);
1675                         my_ok = 0;
1676                 }
1677
1678                 /*
1679                  *      If the conf tells us to, check the CN in the
1680                  *      cert against xlat'ed value, but only if the
1681                  *      previous checks passed.
1682                  */
1683                 if (my_ok && conf->check_cert_cn) {
1684                         if (radius_xlat(cn_str, sizeof(cn_str), request, conf->check_cert_cn, NULL, NULL) < 0) {
1685                                 /* if this fails, fail the verification */
1686                                 my_ok = 0;
1687                         } else {
1688                                 RDEBUG2("checking certificate CN (%s) with xlat'ed value (%s)", common_name, cn_str);
1689                                 if (strcmp(cn_str, common_name) != 0) {
1690                                         radlog(L_AUTH, "rlm_eap_tls: Certificate CN (%s) does not match specified value (%s)!", common_name, cn_str);
1691                                         my_ok = 0;
1692                                 }
1693                         }
1694                 } /* check_cert_cn */
1695
1696 #ifdef HAVE_OPENSSL_OCSP_H
1697                 if (my_ok && conf->ocsp_enable){
1698                         RDEBUG2("--> Starting OCSP Request");
1699                         if(X509_STORE_CTX_get1_issuer(&issuer_cert, ctx, client_cert)!=1) {
1700                                 ERROR("Error: Couldn't get issuer_cert for %s", common_name);
1701                         }
1702                         my_ok = ocsp_check(ocsp_store, issuer_cert, client_cert, conf);
1703                 }
1704 #endif
1705
1706                 while (conf->verify_client_cert_cmd) {
1707                         char filename[256];
1708                         int fd;
1709                         FILE *fp;
1710
1711                         snprintf(filename, sizeof(filename), "%s/%s.client.XXXXXXXX",
1712                                  conf->verify_tmp_dir, progname);
1713                         fd = mkstemp(filename);
1714                         if (fd < 0) {
1715                                 RDEBUG("Failed creating file in %s: %s",
1716                                        conf->verify_tmp_dir, strerror(errno));
1717                                 break;
1718                         }
1719
1720                         fp = fdopen(fd, "w");
1721                         if (!fp) {
1722                                 RDEBUG("Failed opening file %s: %s",
1723                                        filename, strerror(errno));
1724                                 break;
1725                         }
1726
1727                         if (!PEM_write_X509(fp, client_cert)) {
1728                                 fclose(fp);
1729                                 RDEBUG("Failed writing certificate to file");
1730                                 goto do_unlink;
1731                         }
1732                         fclose(fp);
1733
1734                         if (!pairmake_packet("TLS-Client-Cert-Filename",
1735                                              filename, T_OP_SET)) {
1736                                 RDEBUG("Failed creating TLS-Client-Cert-Filename");
1737
1738                                 goto do_unlink;
1739                         }
1740
1741                         RDEBUG("Verifying client certificate: %s",
1742                                conf->verify_client_cert_cmd);
1743                         if (radius_exec_program(conf->verify_client_cert_cmd,
1744                                                 request, 1, NULL, 0,
1745                                                 request->packet->vps,
1746                                                 NULL, 1) != 0) {
1747                                 radlog(L_AUTH, "rlm_eap_tls: Certificate CN (%s) fails external verification!", common_name);
1748                                 my_ok = 0;
1749                         } else {
1750                                 RDEBUG("Client certificate CN %s passed external validation", common_name);
1751                         }
1752
1753                 do_unlink:
1754                         unlink(filename);
1755                         break;
1756                 }
1757
1758
1759         } /* depth == 0 */
1760
1761         if (debug_flag > 0) {
1762                 RDEBUG2("chain-depth=%d, ", depth);
1763                 RDEBUG2("error=%d", err);
1764
1765                 if (identity) RDEBUG2("--> User-Name = %s", *identity);
1766                 RDEBUG2("--> BUF-Name = %s", common_name);
1767                 RDEBUG2("--> subject = %s", subject);
1768                 RDEBUG2("--> issuer  = %s", issuer);
1769                 RDEBUG2("--> verify return:%d", my_ok);
1770         }
1771         return my_ok;
1772 }
1773
1774
1775 #ifdef HAVE_OPENSSL_OCSP_H
1776 /*
1777  *      Create Global X509 revocation store and use it to verify
1778  *      OCSP responses
1779  *
1780  *      - Load the trusted CAs
1781  *      - Load the trusted issuer certificates
1782  */
1783 static X509_STORE *init_revocation_store(fr_tls_server_conf_t *conf)
1784 {
1785         X509_STORE *store = NULL;
1786
1787         store = X509_STORE_new();
1788
1789         /* Load the CAs we trust */
1790         if (conf->ca_file || conf->ca_path)
1791                 if(!X509_STORE_load_locations(store, conf->ca_file, conf->ca_path)) {
1792                         ERROR("rlm_eap: X509_STORE error %s", ERR_error_string(ERR_get_error(), NULL));
1793                         ERROR("rlm_eap_tls: Error reading Trusted root CA list %s",conf->ca_file );
1794                         return NULL;
1795                 }
1796
1797 #ifdef X509_V_FLAG_CRL_CHECK
1798         if (conf->check_crl)
1799                 X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK);
1800 #endif
1801         return store;
1802 }
1803 #endif  /* HAVE_OPENSSL_OCSP_H */
1804
1805 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
1806 #ifndef OPENSSL_NO_ECDH
1807 static int set_ecdh_curve(SSL_CTX *ctx, char const *ecdh_curve)
1808 {
1809         int      nid;
1810         EC_KEY  *ecdh;
1811
1812         if (!ecdh_curve || !*ecdh_curve) return 0;
1813
1814         nid = OBJ_sn2nid(ecdh_curve);
1815         if (!nid) {
1816                 ERROR("Unknown ecdh_curve \"%s\"", ecdh_curve);
1817                 return -1;
1818         }
1819
1820         ecdh = EC_KEY_new_by_curve_name(nid);
1821         if (!ecdh) {
1822                 ERROR("Unable to create new curve \"%s\"", ecdh_curve);
1823                 return -1;
1824         }
1825
1826         SSL_CTX_set_tmp_ecdh(ctx, ecdh);
1827
1828         SSL_CTX_set_options(ctx, SSL_OP_SINGLE_ECDH_USE);
1829
1830         EC_KEY_free(ecdh);
1831
1832         return 0;
1833 }
1834 #endif
1835 #endif
1836
1837 /*
1838  * DIE OPENSSL DIE DIE DIE
1839  *
1840  * What a palaver, just to free some data attached the
1841  * session. We need to do this because the "remove" callback
1842  * is called when refcount > 0 sometimes, if another thread
1843  * is using the session
1844  */
1845 static void sess_free_vps(UNUSED void *parent, void *data_ptr,
1846                                 UNUSED CRYPTO_EX_DATA *ad, UNUSED int idx,
1847                                 UNUSED long argl, UNUSED void *argp)
1848 {
1849         VALUE_PAIR *vp = data_ptr;
1850         if (!vp) return;
1851
1852         DEBUG2("  Freeing cached session VPs %p", vp);
1853
1854         pairfree(&vp);
1855 }
1856
1857
1858 /*
1859  *      Create Global context SSL and use it in every new session
1860  *
1861  *      - Load the trusted CAs
1862  *      - Load the Private key & the certificate
1863  *      - Set the Context options & Verify options
1864  */
1865 static SSL_CTX *init_tls_ctx(fr_tls_server_conf_t *conf, int client)
1866 {
1867         SSL_CTX *ctx;
1868         X509_STORE *certstore;
1869         int verify_mode = SSL_VERIFY_NONE;
1870         int ctx_options = 0;
1871         int type;
1872
1873         /*
1874          *      Add all the default ciphers and message digests
1875          *      Create our context.
1876          */
1877         SSL_library_init();
1878         SSL_load_error_strings();
1879
1880         /*
1881          *      SHA256 is in all versions of OpenSSL, but isn't
1882          *      initialized by default.  It's needed for WiMAX
1883          *      certificates.
1884          */
1885 #ifdef HAVE_OPENSSL_EVP_SHA256
1886         EVP_add_digest(EVP_sha256());
1887 #endif
1888
1889         ctx = SSL_CTX_new(TLSv1_method());
1890
1891         /*
1892          * Save the config on the context so that callbacks which
1893          * only get SSL_CTX* e.g. session persistence, can get it
1894          */
1895         SSL_CTX_set_app_data(ctx, conf);
1896
1897         /*
1898          * Identify the type of certificates that needs to be loaded
1899          */
1900         if (conf->file_type) {
1901                 type = SSL_FILETYPE_PEM;
1902         } else {
1903                 type = SSL_FILETYPE_ASN1;
1904         }
1905
1906         /*
1907          * Set the password to load private key
1908          */
1909         if (conf->private_key_password) {
1910 #ifdef __APPLE__
1911                 /*
1912                  * We don't want to put the private key password in eap.conf, so  check
1913                  * for our special string which indicates we should get the password
1914                  * programmatically.
1915                  */
1916                 char const* special_string = "Apple:UseCertAdmin";
1917                 if (strncmp(conf->private_key_password,
1918                                         special_string,
1919                                         strlen(special_string)) == 0)
1920                 {
1921                         char cmd[256];
1922                         const long max_password_len = 128;
1923                         snprintf(cmd, sizeof(cmd) - 1,
1924                                          "/usr/sbin/certadmin --get-private-key-passphrase \"%s\"",
1925                                          conf->private_key_file);
1926
1927                         DEBUG2("rlm_eap: Getting private key passphrase using command \"%s\"", cmd);
1928
1929                         FILE* cmd_pipe = popen(cmd, "r");
1930                         if (!cmd_pipe) {
1931                                 ERROR("TLS: %s command failed.  Unable to get private_key_password", cmd);
1932                                 ERROR("Error reading private_key_file %s", conf->private_key_file);
1933                                 return NULL;
1934                         }
1935
1936                         talloc_free(conf->private_key_password);
1937                         conf->private_key_password = talloc_array(conf, char, max_password_len);
1938                         if (!conf->private_key_password) {
1939                                 ERROR("TLS: Can't allocate space for private_key_password");
1940                                 ERROR("TLS: Error reading private_key_file %s", conf->private_key_file);
1941                                 pclose(cmd_pipe);
1942                                 return NULL;
1943                         }
1944
1945                         fgets(conf->private_key_password, max_password_len, cmd_pipe);
1946                         pclose(cmd_pipe);
1947
1948                         /* Get rid of newline at end of password. */
1949                         conf->private_key_password[strlen(conf->private_key_password) - 1] = '\0';
1950                         DEBUG2("rlm_eap:  Password from command = \"%s\"", conf->private_key_password);
1951                 }
1952 #endif
1953                 SSL_CTX_set_default_passwd_cb_userdata(ctx, conf->private_key_password);
1954                 SSL_CTX_set_default_passwd_cb(ctx, cbtls_password);
1955         }
1956
1957 #ifdef PSK_MAX_IDENTITY_LEN
1958         if ((conf->psk_identity && !conf->psk_password) ||
1959             (!conf->psk_identity && conf->psk_password) ||
1960             (conf->psk_identity && !*conf->psk_identity) ||
1961             (conf->psk_password && !*conf->psk_password)) {
1962                 ERROR("Invalid PSK Configuration: psk_identity or psk_password are empty");
1963                 return NULL;
1964         }
1965
1966         if (conf->psk_identity) {
1967                 size_t psk_len, hex_len;
1968                 char buffer[PSK_MAX_PSK_LEN];
1969
1970                 if (conf->certificate_file ||
1971                     conf->private_key_password || conf->private_key_file ||
1972                     conf->ca_file || conf->ca_path) {
1973                         ERROR("When PSKs are used, No certificate configuration is permitted");
1974                         return NULL;
1975                 }
1976
1977                 if (client) {
1978                         SSL_CTX_set_psk_client_callback(ctx,
1979                                                         psk_client_callback);
1980                 } else {
1981                         SSL_CTX_set_psk_server_callback(ctx,
1982                                                         psk_server_callback);
1983                 }
1984
1985                 psk_len = strlen(conf->psk_password);
1986                 if (strlen(conf->psk_password) > (2 * PSK_MAX_PSK_LEN)) {
1987                         ERROR("psk_hexphrase is too long (max %d)",
1988                                PSK_MAX_PSK_LEN);
1989                         return NULL;
1990                 }
1991
1992                 hex_len = fr_hex2bin(conf->psk_password,
1993                                      (uint8_t *) buffer, psk_len);
1994                 if (psk_len != (2 * hex_len)) {
1995                         ERROR("psk_hexphrase is not all hex");
1996                         return NULL;
1997                 }
1998
1999                 goto post_ca;
2000         }
2001 #else
2002         (void) client;  /* -Wunused */
2003 #endif
2004
2005         /*
2006          *      Load our keys and certificates
2007          *
2008          *      If certificates are of type PEM then we can make use
2009          *      of cert chain authentication using openssl api call
2010          *      SSL_CTX_use_certificate_chain_file.  Please see how
2011          *      the cert chain needs to be given in PEM from
2012          *      openSSL.org
2013          */
2014         if (!conf->certificate_file) goto load_ca;
2015
2016         if (type == SSL_FILETYPE_PEM) {
2017                 if (!(SSL_CTX_use_certificate_chain_file(ctx, conf->certificate_file))) {
2018                         ERROR("Error reading certificate file %s:%s",
2019                                conf->certificate_file,
2020                                ERR_error_string(ERR_get_error(), NULL));
2021                         return NULL;
2022                 }
2023
2024         } else if (!(SSL_CTX_use_certificate_file(ctx, conf->certificate_file, type))) {
2025                 ERROR("Error reading certificate file %s:%s",
2026                        conf->certificate_file,
2027                        ERR_error_string(ERR_get_error(), NULL));
2028                 return NULL;
2029         }
2030
2031         /* Load the CAs we trust */
2032 load_ca:
2033         if (conf->ca_file || conf->ca_path) {
2034                 if (!SSL_CTX_load_verify_locations(ctx, conf->ca_file, conf->ca_path)) {
2035                         ERROR("rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
2036                         ERROR("rlm_eap_tls: Error reading Trusted root CA list %s",conf->ca_file );
2037                         return NULL;
2038                 }
2039         }
2040         if (conf->ca_file && *conf->ca_file) SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(conf->ca_file));
2041
2042         if (conf->private_key_file) {
2043                 if (!(SSL_CTX_use_PrivateKey_file(ctx, conf->private_key_file, type))) {
2044                         ERROR("Failed reading private key file %s:%s",
2045                                conf->private_key_file,
2046                                ERR_error_string(ERR_get_error(), NULL));
2047                         return NULL;
2048                 }
2049
2050                 /*
2051                  * Check if the loaded private key is the right one
2052                  */
2053                 if (!SSL_CTX_check_private_key(ctx)) {
2054                         ERROR("Private key does not match the certificate public key");
2055                         return NULL;
2056                 }
2057         }
2058
2059 #ifdef PSK_MAX_IDENTITY_LEN
2060 post_ca:
2061 #endif
2062
2063         /*
2064          *      Set ctx_options
2065          */
2066         ctx_options |= SSL_OP_NO_SSLv2;
2067         ctx_options |= SSL_OP_NO_SSLv3;
2068 #ifdef SSL_OP_NO_TICKET
2069         ctx_options |= SSL_OP_NO_TICKET ;
2070 #endif
2071
2072         /*
2073          *      SSL_OP_SINGLE_DH_USE must be used in order to prevent
2074          *      small subgroup attacks and forward secrecy. Always
2075          *      using
2076          *
2077          *      SSL_OP_SINGLE_DH_USE has an impact on the computer
2078          *      time needed during negotiation, but it is not very
2079          *      large.
2080          */
2081         ctx_options |= SSL_OP_SINGLE_DH_USE;
2082
2083         /*
2084          *      SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS to work around issues
2085          *      in Windows Vista client.
2086          *      http://www.openssl.org/~bodo/tls-cbc.txt
2087          *      http://www.nabble.com/(RADIATOR)-Radiator-Version-3.16-released-t2600070.html
2088          */
2089         ctx_options |= SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
2090
2091         SSL_CTX_set_options(ctx, ctx_options);
2092
2093         /*
2094          *      TODO: Set the RSA & DH
2095          *      SSL_CTX_set_tmp_rsa_callback(ctx, cbtls_rsa);
2096          *      SSL_CTX_set_tmp_dh_callback(ctx, cbtls_dh);
2097          */
2098
2099         /*
2100          *      set the message callback to identify the type of
2101          *      message.  For every new session, there can be a
2102          *      different callback argument.
2103          *
2104          *      SSL_CTX_set_msg_callback(ctx, cbtls_msg);
2105          */
2106
2107         /*
2108          *      Set eliptical curve crypto configuration.
2109          */
2110 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
2111 #ifndef OPENSSL_NO_ECDH
2112         if (set_ecdh_curve(ctx, conf->ecdh_curve) < 0) {
2113                 return NULL;
2114         }
2115 #endif
2116 #endif
2117
2118         /* Set Info callback */
2119         SSL_CTX_set_info_callback(ctx, cbtls_info);
2120
2121         /*
2122          *      Callbacks, etc. for session resumption.
2123          */
2124         if (conf->session_cache_enable) {
2125                 SSL_CTX_sess_set_new_cb(ctx, cbtls_new_session);
2126                 SSL_CTX_sess_set_get_cb(ctx, cbtls_get_session);
2127                 SSL_CTX_sess_set_remove_cb(ctx, cbtls_remove_session);
2128
2129                 SSL_CTX_set_quiet_shutdown(ctx, 1);
2130                 if (FR_TLS_EX_INDEX_VPS < 0)
2131                         FR_TLS_EX_INDEX_VPS = SSL_SESSION_get_ex_new_index(0, NULL, NULL, NULL, sess_free_vps);
2132         }
2133
2134         /*
2135          *      Check the certificates for revocation.
2136          */
2137 #ifdef X509_V_FLAG_CRL_CHECK
2138         if (conf->check_crl) {
2139           certstore = SSL_CTX_get_cert_store(ctx);
2140           if (certstore == NULL) {
2141             ERROR("rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
2142             ERROR("rlm_eap_tls: Error reading Certificate Store");
2143             return NULL;
2144           }
2145           X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK);
2146         }
2147 #endif
2148
2149         /*
2150          *      Set verify modes
2151          *      Always verify the peer certificate
2152          */
2153         verify_mode |= SSL_VERIFY_PEER;
2154         verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
2155         verify_mode |= SSL_VERIFY_CLIENT_ONCE;
2156         SSL_CTX_set_verify(ctx, verify_mode, cbtls_verify);
2157
2158         if (conf->verify_depth) {
2159                 SSL_CTX_set_verify_depth(ctx, conf->verify_depth);
2160         }
2161
2162         /* Load randomness */
2163         if (conf->random_file) {
2164                 if (!(RAND_load_file(conf->random_file, 1024*1024))) {
2165                         ERROR("rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
2166                         ERROR("rlm_eap_tls: Error loading randomness");
2167                         return NULL;
2168                 }
2169         }
2170
2171         /*
2172          * Set the cipher list if we were told to
2173          */
2174         if (conf->cipher_list) {
2175                 if (!SSL_CTX_set_cipher_list(ctx, conf->cipher_list)) {
2176                         ERROR("rlm_eap_tls: Error setting cipher list");
2177                         return NULL;
2178                 }
2179         }
2180
2181         /*
2182          *      Setup session caching
2183          */
2184         if (conf->session_cache_enable) {
2185                 /*
2186                  *      Create a unique context Id per EAP-TLS configuration.
2187                  */
2188                 if (conf->session_id_name) {
2189                         snprintf(conf->session_context_id,
2190                                  sizeof(conf->session_context_id),
2191                                  "FR eap %s",
2192                                  conf->session_id_name);
2193                 } else {
2194                         snprintf(conf->session_context_id,
2195                                  sizeof(conf->session_context_id),
2196                                  "FR eap %p", conf);
2197                 }
2198
2199                 /*
2200                  *      Cache it, and DON'T auto-clear it.
2201                  */
2202                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_SERVER | SSL_SESS_CACHE_NO_AUTO_CLEAR);
2203
2204                 SSL_CTX_set_session_id_context(ctx,
2205                                                (unsigned char *) conf->session_context_id,
2206                                                (unsigned int) strlen(conf->session_context_id));
2207
2208                 /*
2209                  *      Our timeout is in hours, this is in seconds.
2210                  */
2211                 SSL_CTX_set_timeout(ctx, conf->session_timeout * 3600);
2212
2213                 /*
2214                  *      Set the maximum number of entries in the
2215                  *      session cache.
2216                  */
2217                 SSL_CTX_sess_set_cache_size(ctx, conf->session_cache_size);
2218
2219         } else {
2220                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
2221         }
2222
2223         return ctx;
2224 }
2225
2226
2227 /*
2228  *      Free TLS client/server config
2229  *      Should not be called outside this code, as a callback is
2230  *      added to automatically free the data when the CONF_SECTION
2231  *      is freed.
2232  */
2233 static void tls_server_conf_free(fr_tls_server_conf_t *conf)
2234 {
2235         if (!conf) return;
2236
2237         if (conf->ctx) SSL_CTX_free(conf->ctx);
2238
2239 #ifdef HAVE_OPENSSL_OCSP_H
2240         if (conf->ocsp_store) X509_STORE_free(conf->ocsp_store);
2241         conf->ocsp_store = NULL;
2242 #endif
2243
2244 #ifndef NDEBUG
2245         memset(conf, 0, sizeof(*conf));
2246 #endif
2247         talloc_free(conf);
2248 }
2249
2250
2251 fr_tls_server_conf_t *tls_server_conf_parse(CONF_SECTION *cs)
2252 {
2253         fr_tls_server_conf_t *conf;
2254
2255         /*
2256          *      If cs has already been parsed there should be a cached copy
2257          *      of conf already stored, so just return that.
2258          */
2259         conf = cf_data_find(cs, "tls-conf");
2260         if (conf) {
2261                 DEBUG(" debug: Using cached TLS configuration from previous invocation");
2262                 return conf;
2263         }
2264
2265         conf = talloc_zero(cs, fr_tls_server_conf_t);
2266         if (!conf) {
2267                 ERROR("Out of memory");
2268                 return NULL;
2269         }
2270
2271         if (cf_section_parse(cs, conf, tls_server_config) < 0) {
2272         error:
2273                 tls_server_conf_free(conf);
2274                 return NULL;
2275         }
2276
2277         /*
2278          *      Save people from their own stupidity.
2279          */
2280         if (conf->fragment_size < 100) conf->fragment_size = 100;
2281
2282         /*
2283          *      This magic makes the administrators life HUGELY easier
2284          *      on initial deployments.
2285          *
2286          *      If the server starts up in debugging mode, AND the
2287          *      bootstrap command is configured, AND it exists, AND
2288          *      there is no server certificate
2289          */
2290         if (conf->make_cert_command && (debug_flag >= 2)) {
2291                 struct stat buf;
2292
2293                 if ((stat(conf->make_cert_command, &buf) == 0) &&
2294                     (stat(conf->certificate_file, &buf) < 0) &&
2295                     (errno == ENOENT) &&
2296                     (radius_exec_program(conf->make_cert_command, NULL, 1,
2297                                          NULL, 0, NULL, NULL, 0) != 0)) {
2298                         goto error;
2299                 }
2300         }
2301
2302         if (!conf->private_key_file) {
2303                 ERROR("TLS Server requires a private key file");
2304                 goto error;
2305         }
2306
2307         if (!conf->certificate_file) {
2308                 ERROR("TLS Server requires a certificate file");
2309                 goto error;
2310         }
2311
2312         /*
2313          *      Initialize TLS
2314          */
2315         conf->ctx = init_tls_ctx(conf, 0);
2316         if (conf->ctx == NULL) {
2317                 goto error;
2318         }
2319
2320 #ifdef HAVE_OPENSSL_OCSP_H
2321         /*
2322          *      Initialize OCSP Revocation Store
2323          */
2324         if (conf->ocsp_enable) {
2325                 conf->ocsp_store = init_revocation_store(conf);
2326                 if (conf->ocsp_store == NULL) goto error;
2327         }
2328 #endif /*HAVE_OPENSSL_OCSP_H*/
2329
2330         if (load_dh_params(conf->ctx, conf->dh_file) < 0) {
2331                 goto error;
2332         }
2333
2334         if (generate_eph_rsa_key(conf->ctx) < 0) {
2335                 goto error;
2336         }
2337
2338         if (conf->verify_tmp_dir) {
2339                 if (chmod(conf->verify_tmp_dir, S_IRWXU) < 0) {
2340                         ERROR("Failed changing permissions on %s: %s", conf->verify_tmp_dir, strerror(errno));
2341                         goto error;
2342                 }
2343         }
2344
2345         if (conf->verify_client_cert_cmd && !conf->verify_tmp_dir) {
2346                 ERROR("You MUST set the verify directory in order to use verify_client_cmd");
2347                 goto error;
2348         }
2349
2350         /*
2351          *      Cache conf in cs in case we're asked to parse this again.
2352          */
2353         cf_data_add(cs, "tls-conf", conf, (void *)(void *) tls_server_conf_free);
2354
2355         return conf;
2356 }
2357
2358 fr_tls_server_conf_t *tls_client_conf_parse(CONF_SECTION *cs)
2359 {
2360         fr_tls_server_conf_t *conf;
2361
2362         conf = cf_data_find(cs, "tls-conf");
2363         if (conf) {
2364                 DEBUG(" debug: Using cached TLS configuration from previous invocation");
2365                 return conf;
2366         }
2367
2368         conf = talloc_zero(cs, fr_tls_server_conf_t);
2369         if (!conf) {
2370                 ERROR("Out of memory");
2371                 return NULL;
2372         }
2373
2374         if (cf_section_parse(cs, conf, tls_client_config) < 0) {
2375         error:
2376                 tls_server_conf_free(conf);
2377                 return NULL;
2378         }
2379
2380         /*
2381          *      Save people from their own stupidity.
2382          */
2383         if (conf->fragment_size < 100) conf->fragment_size = 100;
2384
2385         /*
2386          *      Initialize TLS
2387          */
2388         conf->ctx = init_tls_ctx(conf, 1);
2389         if (conf->ctx == NULL) {
2390                 goto error;
2391         }
2392
2393         if (load_dh_params(conf->ctx, conf->dh_file) < 0) {
2394                 goto error;
2395         }
2396
2397         if (generate_eph_rsa_key(conf->ctx) < 0) {
2398                 goto error;
2399         }
2400
2401         cf_data_add(cs, "tls-conf", conf, (void *)(void *) tls_server_conf_free);
2402
2403         return conf;
2404 }
2405
2406 int tls_success(tls_session_t *ssn, REQUEST *request)
2407 {
2408         VALUE_PAIR *vp, *vps = NULL;
2409         fr_tls_server_conf_t *conf;
2410
2411         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CONF);
2412         rad_assert(conf != NULL);
2413
2414         /*
2415          *      If there's no session resumption, delete the entry
2416          *      from the cache.  This means either it's disabled
2417          *      globally for this SSL context, OR we were told to
2418          *      disable it for this user.
2419          *
2420          *      This also means you can't turn it on just for one
2421          *      user.
2422          */
2423         if ((!ssn->allow_session_resumption) ||
2424             (((vp = pairfind(request->config_items, 1127, 0, TAG_ANY)) != NULL) &&
2425              (vp->vp_integer == 0))) {
2426                 SSL_CTX_remove_session(ssn->ctx,
2427                                        ssn->ssl->session);
2428                 ssn->allow_session_resumption = 0;
2429
2430                 /*
2431                  *      If we're in a resumed session and it's
2432                  *      not allowed,
2433                  */
2434                 if (SSL_session_reused(ssn->ssl)) {
2435                         RDEBUG("FAIL: Forcibly stopping session resumption as it is not allowed.");
2436                         return -1;
2437                 }
2438
2439                 /*
2440                  *      Else resumption IS allowed, so we store the
2441                  *      user data in the cache.
2442                  */
2443         } else if (!SSL_session_reused(ssn->ssl)) {
2444                 size_t size;
2445                 VALUE_PAIR **certs;
2446                 char buffer[2 * MAX_SESSION_SIZE + 1];
2447
2448                 size = ssn->ssl->session->session_id_length;
2449                 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
2450
2451                 fr_bin2hex(ssn->ssl->session->session_id, buffer, size);
2452
2453                 vp = paircopy2(NULL, request->reply->vps, PW_USER_NAME, 0, TAG_ANY);
2454                 if (vp) pairadd(&vps, vp);
2455
2456                 vp = paircopy2(NULL, request->packet->vps, PW_STRIPPED_USER_NAME, 0, TAG_ANY);
2457                 if (vp) pairadd(&vps, vp);
2458
2459                 vp = paircopy2(NULL, request->reply->vps, PW_CACHED_SESSION_POLICY, 0, TAG_ANY);
2460                 if (vp) pairadd(&vps, vp);
2461
2462                 certs = (VALUE_PAIR **)SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CERTS);
2463
2464                 /*
2465                  *      Hmm... the certs should probably be session data.
2466                  */
2467                 if (certs) {
2468                         /*
2469                          *      @todo: some go into reply, others into
2470                          *      request
2471                          */
2472                         pairadd(&vps, paircopy(NULL, *certs));
2473                 }
2474
2475                 if (vps) {
2476                         RDEBUG2("Saving session %s vps %p in the cache", buffer, vps);
2477                         SSL_SESSION_set_ex_data(ssn->ssl->session,
2478                                                 FR_TLS_EX_INDEX_VPS, vps);
2479                         if (conf->session_cache_path) {
2480                                 /* write the VPs to the cache file */
2481                                 char filename[256], buf[1024];
2482                                 FILE *vp_file;
2483
2484                                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
2485                                         conf->session_cache_path, FR_DIR_SEP, buffer
2486                                         );
2487                                 vp_file = fopen(filename, "w");
2488                                 if (vp_file == NULL) {
2489                                         RDEBUG2("Could not write session VPs to persistent cache: %s", strerror(errno));
2490                                 } else {
2491                                         /* generate a dummy user-style entry which is easy to read back */
2492                                         fprintf(vp_file, "# SSL cached session\n");
2493                                         fprintf(vp_file, "%s\n", buffer);
2494                                         for (vp=vps; vp; vp = vp->next) {
2495                                                 vp_prints(buf, sizeof(buf), vp);
2496                                                 fprintf(vp_file, "\t%s%s\n", buf, vp->next ? "," : "");
2497                                         }
2498                                         fclose(vp_file);
2499                                 }
2500                         }
2501                 } else {
2502                         RDEBUG2W("No information to cache: session caching will be disabled for session %s", buffer);
2503                         SSL_CTX_remove_session(ssn->ctx,
2504                                                ssn->ssl->session);
2505                 }
2506
2507                 /*
2508                  *      Else the session WAS allowed.  Copy the cached
2509                  *      reply.
2510                  */
2511         } else {
2512                 size_t size;
2513                 char buffer[2 * MAX_SESSION_SIZE + 1];
2514
2515                 size = ssn->ssl->session->session_id_length;
2516                 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
2517
2518                 fr_bin2hex(ssn->ssl->session->session_id, buffer, size);
2519
2520                 vps = SSL_SESSION_get_ex_data(ssn->ssl->session,
2521                                              FR_TLS_EX_INDEX_VPS);
2522                 if (!vps) {
2523                         RDEBUGW("No information in cached session %s", buffer);
2524                         return -1;
2525
2526                 } else {
2527                         RDEBUG("Adding cached attributes for session %s:",
2528                                buffer);
2529                         debug_pair_list(vps);
2530
2531                         for (vp = vps; vp != NULL; vp = vp->next) {
2532                                 /*
2533                                  *      TLS-* attrs get added back to
2534                                  *      the request list.
2535                                  */
2536                                 if ((vp->da->vendor == 0) &&
2537                                     (vp->da->attr >= 1910) &&
2538                                     (vp->da->attr < 1929)) {
2539                                         pairadd(&request->packet->vps,
2540                                                 paircopyvp(request->packet, vp));
2541                                 } else {
2542                                         pairadd(&request->reply->vps,
2543                                                 paircopyvp(request->packet, vp));
2544                                 }
2545                         }
2546
2547                         if (conf->session_cache_path) {
2548                                 /* "touch" the cached session/vp file */
2549                                 char filename[256];
2550
2551                                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
2552                                         conf->session_cache_path, FR_DIR_SEP, buffer
2553                                         );
2554                                 utime(filename, NULL);
2555                                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
2556                                         conf->session_cache_path, FR_DIR_SEP, buffer
2557                                         );
2558                                 utime(filename, NULL);
2559                         }
2560
2561                         /*
2562                          *      Mark the request as resumed.
2563                          */
2564                         pairmake_packet("EAP-Session-Resumed", "1", T_OP_SET);
2565                 }
2566         }
2567
2568         return 0;
2569 }
2570
2571
2572 void tls_fail(tls_session_t *ssn)
2573 {
2574         /*
2575          *      Force the session to NOT be cached.
2576          */
2577         SSL_CTX_remove_session(ssn->ctx, ssn->ssl->session);
2578 }
2579
2580 fr_tls_status_t tls_application_data(tls_session_t *ssn,
2581                                      REQUEST *request)
2582
2583 {
2584         int err;
2585
2586         /*
2587          *      Decrypt the complete record.
2588          */
2589         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data,
2590                         ssn->dirty_in.used);
2591         if (err != (int) ssn->dirty_in.used) {
2592                 record_init(&ssn->dirty_in);
2593                 RDEBUG("Failed writing %d to SSL BIO: %d",
2594                        ssn->dirty_in.used, err);
2595                 return FR_TLS_FAIL;
2596         }
2597
2598         /*
2599          *      Clear the dirty buffer now that we are done with it
2600          *      and init the clean_out buffer to store decrypted data
2601          */
2602         record_init(&ssn->dirty_in);
2603         record_init(&ssn->clean_out);
2604
2605         /*
2606          *      Read (and decrypt) the tunneled data from the
2607          *      SSL session, and put it into the decrypted
2608          *      data buffer.
2609          */
2610         err = SSL_read(ssn->ssl, ssn->clean_out.data,
2611                        sizeof(ssn->clean_out.data));
2612
2613         if (err < 0) {
2614                 int code;
2615
2616                 RDEBUG("SSL_read Error");
2617
2618                 code = SSL_get_error(ssn->ssl, err);
2619                 switch (code) {
2620                 case SSL_ERROR_WANT_READ:
2621                         DEBUG("Error in fragmentation logic: SSL_WANT_READ");
2622                         return FR_TLS_MORE_FRAGMENTS;
2623
2624                 case SSL_ERROR_WANT_WRITE:
2625                         DEBUG("Error in fragmentation logic: SSL_WANT_WRITE");
2626                         break;
2627
2628                 default:
2629                         DEBUG("Error in fragmentation logic: ?");
2630
2631                         /*
2632                          *      FIXME: Call int_ssl_check?
2633                          */
2634                         break;
2635                 }
2636                 return FR_TLS_FAIL;
2637         }
2638
2639         if (err == 0) {
2640                 RDEBUGW("No data inside of the tunnel.");
2641         }
2642
2643         /*
2644          *      Passed all checks, successfully decrypted data
2645          */
2646         ssn->clean_out.used = err;
2647
2648         return FR_TLS_OK;
2649 }
2650
2651
2652 /*
2653  * Acknowledge received is for one of the following messages sent earlier
2654  * 1. Handshake completed Message, so now send, EAP-Success
2655  * 2. Alert Message, now send, EAP-Failure
2656  * 3. Fragment Message, now send, next Fragment
2657  */
2658 fr_tls_status_t tls_ack_handler(tls_session_t *ssn, REQUEST *request)
2659 {
2660         RDEBUG2("Received TLS ACK");
2661
2662         if (ssn == NULL){
2663                 radlog_request(L_ERR, 0, request, "FAIL: Unexpected ACK received.  Could not obtain session information.");
2664                 return FR_TLS_INVALID;
2665         }
2666         if (ssn->info.initialized == 0) {
2667                 RDEBUG("No SSL info available. Waiting for more SSL data.");
2668                 return FR_TLS_REQUEST;
2669         }
2670         if ((ssn->info.content_type == handshake) &&
2671             (ssn->info.origin == 0)) {
2672                 radlog_request(L_ERR, 0, request, "FAIL: ACK without earlier message.");
2673                 return FR_TLS_INVALID;
2674         }
2675
2676         switch (ssn->info.content_type) {
2677         case alert:
2678                 RDEBUG2("ACK alert");
2679                 return FR_TLS_FAIL;
2680
2681         case handshake:
2682                 if ((ssn->info.handshake_type == finished) &&
2683                     (ssn->dirty_out.used == 0)) {
2684                         RDEBUG2("ACK handshake is finished");
2685
2686                         /*
2687                          *      From now on all the content is
2688                          *      application data set it here as nobody else
2689                          *      sets it.
2690                          */
2691                         ssn->info.content_type = application_data;
2692                         return FR_TLS_SUCCESS;
2693                 } /* else more data to send */
2694
2695                 RDEBUG2("ACK handshake fragment handler");
2696                 /* Fragmentation handler, send next fragment */
2697                 return FR_TLS_REQUEST;
2698
2699         case application_data:
2700                 RDEBUG2("ACK handshake fragment handler in application data");
2701                 return FR_TLS_REQUEST;
2702
2703                 /*
2704                  *      For the rest of the conditions, switch over
2705                  *      to the default section below.
2706                  */
2707         default:
2708                 RDEBUG2("ACK default");
2709                 radlog_request(L_ERR, 0, request, "Invalid ACK received: %d",
2710                        ssn->info.content_type);
2711                 return FR_TLS_INVALID;
2712         }
2713 }
2714
2715 #endif  /* WITH_TLS */
2716