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) REDEBUG("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         case SSL2_VERSION:
 577                 str_version = "SSL 2.0";
 578                 break;
 579         case SSL3_VERSION:
 580                 str_version = "SSL 3.0 ";
 581                 break;
 582         case TLS1_VERSION:
 583                 str_version = "TLS 1.0 ";
 584                 break;
 585         default:
 586                 str_version = "Unknown TLS version";
 587                 break;
 588         }
 589
 590         if (tls_session->info.version == SSL3_VERSION ||
 591             tls_session->info.version == TLS1_VERSION) {
 592                 switch (tls_session->info.content_type) {
 593                 case SSL3_RT_CHANGE_CIPHER_SPEC:
 594                         str_content_type = "ChangeCipherSpec";
 595                         break;
 596                 case SSL3_RT_ALERT:
 597                         str_content_type = "Alert";
 598                         break;
 599                 case SSL3_RT_HANDSHAKE:
 600                         str_content_type = "Handshake";
 601                         break;
 602                 case SSL3_RT_APPLICATION_DATA:
 603                         str_content_type = "ApplicationData";
 604                         break;
 605                 default:
 606                         str_content_type = "UnknownContentType";
 607                         break;
 608                 }
 609
 610                 if (tls_session->info.content_type == SSL3_RT_ALERT) {
 611                         str_details1 = ", ???";
 612
 613                         if (tls_session->info.record_len == 2) {
 614
 615                                 switch (tls_session->info.alert_level) {
 616                                 case SSL3_AL_WARNING:
 617                                         str_details1 = ", warning";
 618                                         break;
 619                                 case SSL3_AL_FATAL:
 620                                         str_details1 = ", fatal";
 621                                         break;
 622                                 }
 623
 624                                 str_details2 = " ???";
 625                                 switch (tls_session->info.alert_description) {
 626                                 case SSL3_AD_CLOSE_NOTIFY:
 627                                         str_details2 = " close_notify";
 628                                         break;
 629                                 case SSL3_AD_UNEXPECTED_MESSAGE:
 630                                         str_details2 = " unexpected_message";
 631                                         break;
 632                                 case SSL3_AD_BAD_RECORD_MAC:
 633                                         str_details2 = " bad_record_mac";
 634                                         break;
 635                                 case TLS1_AD_DECRYPTION_FAILED:
 636                                         str_details2 = " decryption_failed";
 637                                         break;
 638                                 case TLS1_AD_RECORD_OVERFLOW:
 639                                         str_details2 = " record_overflow";
 640                                         break;
 641                                 case SSL3_AD_DECOMPRESSION_FAILURE:
 642                                         str_details2 = " decompression_failure";
 643                                         break;
 644                                 case SSL3_AD_HANDSHAKE_FAILURE:
 645                                         str_details2 = " handshake_failure";
 646                                         break;
 647                                 case SSL3_AD_BAD_CERTIFICATE:
 648                                         str_details2 = " bad_certificate";
 649                                         break;
 650                                 case SSL3_AD_UNSUPPORTED_CERTIFICATE:
 651                                         str_details2 = " unsupported_certificate";
 652                                         break;
 653                                 case SSL3_AD_CERTIFICATE_REVOKED:
 654                                         str_details2 = " certificate_revoked";
 655                                         break;
 656                                 case SSL3_AD_CERTIFICATE_EXPIRED:
 657                                         str_details2 = " certificate_expired";
 658                                         break;
 659                                 case SSL3_AD_CERTIFICATE_UNKNOWN:
 660                                         str_details2 = " certificate_unknown";
 661                                         break;
 662                                 case SSL3_AD_ILLEGAL_PARAMETER:
 663                                         str_details2 = " illegal_parameter";
 664                                         break;
 665                                 case TLS1_AD_UNKNOWN_CA:
 666                                         str_details2 = " unknown_ca";
 667                                         break;
 668                                 case TLS1_AD_ACCESS_DENIED:
 669                                         str_details2 = " access_denied";
 670                                         break;
 671                                 case TLS1_AD_DECODE_ERROR:
 672                                         str_details2 = " decode_error";
 673                                         break;
 674                                 case TLS1_AD_DECRYPT_ERROR:
 675                                         str_details2 = " decrypt_error";
 676                                         break;
 677                                 case TLS1_AD_EXPORT_RESTRICTION:
 678                                         str_details2 = " export_restriction";
 679                                         break;
 680                                 case TLS1_AD_PROTOCOL_VERSION:
 681                                         str_details2 = " protocol_version";
 682                                         break;
 683                                 case TLS1_AD_INSUFFICIENT_SECURITY:
 684                                         str_details2 = " insufficient_security";
 685                                         break;
 686                                 case TLS1_AD_INTERNAL_ERROR:
 687                                         str_details2 = " internal_error";
 688                                         break;
 689                                 case TLS1_AD_USER_CANCELLED:
 690                                         str_details2 = " user_canceled";
 691                                         break;
 692                                 case TLS1_AD_NO_RENEGOTIATION:
 693                                         str_details2 = " no_renegotiation";
 694                                         break;
 695                                 }
 696                         }
 697                 }
 698
 699                 if (tls_session->info.content_type == SSL3_RT_HANDSHAKE) {
 700                         str_details1 = "???";
 701
 702                         if (tls_session->info.record_len > 0)
 703                         switch (tls_session->info.handshake_type) {
 704                         case SSL3_MT_HELLO_REQUEST:
 705                                 str_details1 = ", HelloRequest";
 706                                 break;
 707                         case SSL3_MT_CLIENT_HELLO:
 708                                 str_details1 = ", ClientHello";
 709                                 break;
 710                         case SSL3_MT_SERVER_HELLO:
 711                                 str_details1 = ", ServerHello";
 712                                 break;
 713                         case SSL3_MT_CERTIFICATE:
 714                                 str_details1 = ", Certificate";
 715                                 break;
 716                         case SSL3_MT_SERVER_KEY_EXCHANGE:
 717                                 str_details1 = ", ServerKeyExchange";
 718                                 break;
 719                         case SSL3_MT_CERTIFICATE_REQUEST:
 720                                 str_details1 = ", CertificateRequest";
 721                                 break;
 722                         case SSL3_MT_SERVER_DONE:
 723                                 str_details1 = ", ServerHelloDone";
 724                                 break;
 725                         case SSL3_MT_CERTIFICATE_VERIFY:
 726                                 str_details1 = ", CertificateVerify";
 727                                 break;
 728                         case SSL3_MT_CLIENT_KEY_EXCHANGE:
 729                                 str_details1 = ", ClientKeyExchange";
 730                                 break;
 731                         case SSL3_MT_FINISHED:
 732                                 str_details1 = ", Finished";
 733                                 break;
 734                         }
 735                 }
 736         }
 737
 738         snprintf(tls_session->info.info_description,
 739                  sizeof(tls_session->info.info_description),
 740                  "%s %s%s [length %04lx]%s%s\n",
 741                  str_write_p, str_version, str_content_type,
 742                  (unsigned long)tls_session->info.record_len,
 743                  str_details1, str_details2);
 744
 745         request = SSL_get_ex_data(tls_session->ssl, FR_TLS_EX_INDEX_REQUEST);
 746
 747         RDEBUG2("%s\n", tls_session->info.info_description);
 748 }
 749
 750 static CONF_PARSER cache_config[] = {
 751         { "enable", PW_TYPE_BOOLEAN,
 752           offsetof(fr_tls_server_conf_t, session_cache_enable), NULL, "no" },
 753         { "lifetime", PW_TYPE_INTEGER,
 754           offsetof(fr_tls_server_conf_t, session_timeout), NULL, "24" },
 755         { "max_entries", PW_TYPE_INTEGER,
 756           offsetof(fr_tls_server_conf_t, session_cache_size), NULL, "255" },
 757         { "name", PW_TYPE_STRING_PTR,
 758           offsetof(fr_tls_server_conf_t, session_id_name), NULL, NULL},
 759         { "persist_dir", PW_TYPE_STRING_PTR,
 760           offsetof(fr_tls_server_conf_t, session_cache_path), NULL, NULL},
 761         { NULL, -1, 0, NULL, NULL }        /* end the list */
 762 };
 763
 764 static CONF_PARSER verify_config[] = {
 765         { "tmpdir", PW_TYPE_STRING_PTR,
 766           offsetof(fr_tls_server_conf_t, verify_tmp_dir), NULL, NULL},
 767         { "client", PW_TYPE_STRING_PTR,
 768           offsetof(fr_tls_server_conf_t, verify_client_cert_cmd), NULL, NULL},
 769         { NULL, -1, 0, NULL, NULL }        /* end the list */
 770 };
 771
 772 #ifdef HAVE_OPENSSL_OCSP_H
 773 static CONF_PARSER ocsp_config[] = {
 774         { "enable", PW_TYPE_BOOLEAN,
 775           offsetof(fr_tls_server_conf_t, ocsp_enable), NULL, "no"},
 776         { "override_cert_url", PW_TYPE_BOOLEAN,
 777           offsetof(fr_tls_server_conf_t, ocsp_override_url), NULL, "no"},
 778         { "url", PW_TYPE_STRING_PTR,
 779           offsetof(fr_tls_server_conf_t, ocsp_url), NULL, NULL },
 780         { "use_nonce", PW_TYPE_BOOLEAN,
 781           offsetof(fr_tls_server_conf_t, ocsp_use_nonce), NULL, "yes"},
 782         { "timeout", PW_TYPE_INTEGER,
 783           offsetof(fr_tls_server_conf_t, ocsp_timeout), NULL, "yes"},
 784         { "softfail", PW_TYPE_BOOLEAN,
 785           offsetof(fr_tls_server_conf_t, ocsp_softfail), NULL, "yes"},
 786         { NULL, -1, 0, NULL, NULL }        /* end the list */
 787 };
 788 #endif
 789
 790 static CONF_PARSER tls_server_config[] = {
 791         { "rsa_key_exchange", PW_TYPE_BOOLEAN,
 792           offsetof(fr_tls_server_conf_t, rsa_key), NULL, "no" },
 793         { "dh_key_exchange", PW_TYPE_BOOLEAN,
 794           offsetof(fr_tls_server_conf_t, dh_key), NULL, "yes" },
 795         { "rsa_key_length", PW_TYPE_INTEGER,
 796           offsetof(fr_tls_server_conf_t, rsa_key_length), NULL, "512" },
 797         { "dh_key_length", PW_TYPE_INTEGER,
 798           offsetof(fr_tls_server_conf_t, dh_key_length), NULL, "512" },
 799         { "verify_depth", PW_TYPE_INTEGER,
 800           offsetof(fr_tls_server_conf_t, verify_depth), NULL, "0" },
 801         { "CA_path", PW_TYPE_FILE_INPUT | PW_TYPE_DEPRECATED,
 802           offsetof(fr_tls_server_conf_t, ca_path), NULL, NULL },
 803         { "ca_path", PW_TYPE_FILE_INPUT,
 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_FILE_INPUT,
 808           offsetof(fr_tls_server_conf_t, private_key_file), NULL, NULL },
 809         { "certificate_file", PW_TYPE_FILE_INPUT,
 810           offsetof(fr_tls_server_conf_t, certificate_file), NULL, NULL },
 811         { "CA_file", PW_TYPE_FILE_INPUT | PW_TYPE_DEPRECATED,
 812           offsetof(fr_tls_server_conf_t, ca_file), NULL, NULL },
 813         { "ca_file", PW_TYPE_FILE_INPUT,
 814           offsetof(fr_tls_server_conf_t, ca_file), NULL, NULL },
 815         { "private_key_password", PW_TYPE_STRING_PTR,
 816           offsetof(fr_tls_server_conf_t, private_key_password), NULL, NULL },
 817 #ifdef PSK_MAX_IDENTITY_LEN
 818         { "psk_identity", PW_TYPE_STRING_PTR,
 819           offsetof(fr_tls_server_conf_t, psk_identity), NULL, NULL },
 820         { "psk_hexphrase", PW_TYPE_STRING_PTR,
 821           offsetof(fr_tls_server_conf_t, psk_password), NULL, NULL },
 822 #endif
 823         { "dh_file", PW_TYPE_STRING_PTR,
 824           offsetof(fr_tls_server_conf_t, dh_file), NULL, NULL },
 825         { "random_file", PW_TYPE_STRING_PTR,
 826           offsetof(fr_tls_server_conf_t, random_file), NULL, NULL },
 827         { "fragment_size", PW_TYPE_INTEGER,
 828           offsetof(fr_tls_server_conf_t, fragment_size), NULL, "1024" },
 829         { "include_length", PW_TYPE_BOOLEAN,
 830           offsetof(fr_tls_server_conf_t, include_length), NULL, "yes" },
 831         { "check_crl", PW_TYPE_BOOLEAN,
 832           offsetof(fr_tls_server_conf_t, check_crl), NULL, "no"},
 833         { "allow_expired_crl", PW_TYPE_BOOLEAN,
 834           offsetof(fr_tls_server_conf_t, allow_expired_crl), NULL, NULL},
 835         { "check_cert_cn", PW_TYPE_STRING_PTR,
 836           offsetof(fr_tls_server_conf_t, check_cert_cn), NULL, NULL},
 837         { "cipher_list", PW_TYPE_STRING_PTR,
 838           offsetof(fr_tls_server_conf_t, cipher_list), NULL, NULL},
 839         { "check_cert_issuer", PW_TYPE_STRING_PTR,
 840           offsetof(fr_tls_server_conf_t, check_cert_issuer), 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_FILE_INPUT,
 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_FILE_INPUT,
 879           offsetof(fr_tls_server_conf_t, private_key_file), NULL, NULL },
 880         { "certificate_file", PW_TYPE_FILE_INPUT,
 881           offsetof(fr_tls_server_conf_t, certificate_file), NULL, NULL },
 882         { "ca_file", PW_TYPE_FILE_INPUT,
 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                 WDEBUG2("rlm_eap_tls: Unable to set DH parameters.  DH cipher suites may not work!");
 931                 WDEBUG2("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("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("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("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("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("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("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("OCSP response has wrong nonce value");
1345                 goto ocsp_end;
1346         }
1347         if(OCSP_basic_verify(bresp, NULL, store, 0)!=1){
1348                 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("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         X509_CINF *client_inf;
1477         STACK_OF(X509_EXTENSION) *ext_list;
1478         SSL *ssl;
1479         int err, depth, lookup, loc;
1480         fr_tls_server_conf_t *conf;
1481         int my_ok = ok;
1482         REQUEST *request;
1483         ASN1_INTEGER *sn = NULL;
1484         ASN1_TIME *asn_time = NULL;
1485         VALUE_PAIR **certs;
1486         char **identity;
1487 #ifdef HAVE_OPENSSL_OCSP_H
1488         X509_STORE *ocsp_store = NULL;
1489         X509 *issuer_cert;
1490 #endif
1491
1492         client_cert = X509_STORE_CTX_get_current_cert(ctx);
1493         err = X509_STORE_CTX_get_error(ctx);
1494         depth = X509_STORE_CTX_get_error_depth(ctx);
1495
1496         lookup = depth;
1497
1498         /*
1499          *      Log client/issuing cert.  If there's an error, log
1500          *      issuing cert.
1501          */
1502         if ((lookup > 1) && !my_ok) lookup = 1;
1503
1504         /*
1505          * Retrieve the pointer to the SSL of the connection currently treated
1506          * and the application specific data stored into the SSL object.
1507          */
1508         ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
1509         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1510         if (!conf) return 1;
1511
1512         request = (REQUEST *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
1513
1514         if (!request) return 1; /* FIXME: outbound TLS */
1515
1516         rad_assert(request != NULL);
1517         certs = (VALUE_PAIR **)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CERTS);
1518         rad_assert(certs != NULL);
1519         identity = (char **)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_IDENTITY);
1520 #ifdef HAVE_OPENSSL_OCSP_H
1521         ocsp_store = (X509_STORE *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_STORE);
1522 #endif
1523
1524         /*
1525          *      Get the Serial Number
1526          */
1527         buf[0] = '\0';
1528         sn = X509_get_serialNumber(client_cert);
1529
1530         /*
1531          *      For this next bit, we create the attributes *only* if
1532          *      we're at the client or issuing certificate, AND we
1533          *      have a user identity.  i.e. we don't create the
1534          *      attributes for RadSec connections.
1535          */
1536         if (identity &&
1537             (lookup <= 1) && sn && ((size_t) sn->length < (sizeof(buf) / 2))) {
1538                 char *p = buf;
1539                 int i;
1540
1541                 for (i = 0; i < sn->length; i++) {
1542                         sprintf(p, "%02x", (unsigned int)sn->data[i]);
1543                         p += 2;
1544                 }
1545                 pairmake(NULL, certs, cert_attr_names[FR_TLS_SERIAL][lookup], buf, T_OP_SET);
1546         }
1547
1548
1549         /*
1550          *      Get the Expiration Date
1551          */
1552         buf[0] = '\0';
1553         asn_time = X509_get_notAfter(client_cert);
1554         if (identity && (lookup <= 1) && asn_time &&
1555             (asn_time->length < (int) sizeof(buf))) {
1556                 memcpy(buf, (char*) asn_time->data, asn_time->length);
1557                 buf[asn_time->length] = '\0';
1558                 pairmake(NULL, certs, cert_attr_names[FR_TLS_EXPIRATION][lookup], buf, T_OP_SET);
1559         }
1560
1561         /*
1562          *      Get the Subject & Issuer
1563          */
1564         subject[0] = issuer[0] = '\0';
1565         X509_NAME_oneline(X509_get_subject_name(client_cert), subject,
1566                           sizeof(subject));
1567         subject[sizeof(subject) - 1] = '\0';
1568         if (identity && (lookup <= 1) && subject[0]) {
1569                 pairmake(NULL, certs, cert_attr_names[FR_TLS_SUBJECT][lookup], subject, T_OP_SET);
1570         }
1571
1572         X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), issuer,
1573                           sizeof(issuer));
1574         issuer[sizeof(issuer) - 1] = '\0';
1575         if (identity && (lookup <= 1) && issuer[0]) {
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                 pairmake(NULL, certs, cert_attr_names[FR_TLS_CN][lookup], common_name, T_OP_SET);
1587         }
1588
1589 #ifdef GEN_EMAIL
1590         /*
1591          *      Get the RFC822 Subject Alternative Name
1592          */
1593         loc = X509_get_ext_by_NID(client_cert, NID_subject_alt_name, 0);
1594         if (lookup <= 1 && loc >= 0) {
1595                 X509_EXTENSION *ext = NULL;
1596                 GENERAL_NAMES *names = NULL;
1597                 int i;
1598
1599                 if ((ext = X509_get_ext(client_cert, loc)) &&
1600                     (names = X509V3_EXT_d2i(ext))) {
1601                         for (i = 0; i < sk_GENERAL_NAME_num(names); i++) {
1602                                 GENERAL_NAME *name = sk_GENERAL_NAME_value(names, i);
1603
1604                                 switch (name->type) {
1605                                 case GEN_EMAIL:
1606                                         pairmake(NULL, certs, cert_attr_names[FR_TLS_SAN_EMAIL][lookup],
1607                                                  (char *) ASN1_STRING_data(name->d.rfc822Name), T_OP_SET);
1608                                         break;
1609                                 default:
1610                                         /* XXX TODO handle other SAN types */
1611                                         break;
1612                                 }
1613                         }
1614                 }
1615                 if (names != NULL)
1616                         sk_GENERAL_NAME_free(names);
1617         }
1618 #endif  /* GEN_EMAIL */
1619
1620         /*
1621          *      If the CRL has expired, that might still be OK.
1622          */
1623         if (!my_ok &&
1624             (conf->allow_expired_crl) &&
1625             (err == X509_V_ERR_CRL_HAS_EXPIRED)) {
1626                 my_ok = 1;
1627                 X509_STORE_CTX_set_error( ctx, 0 );
1628         }
1629
1630         if (!my_ok) {
1631                 char const *p = X509_verify_cert_error_string(err);
1632                 ERROR("--> verify error:num=%d:%s\n",err, p);
1633                 REDEBUG("SSL says error %d : %s", err, p);
1634                 return my_ok;
1635         }
1636
1637         if (lookup == 0) {
1638                 client_inf = client_cert->cert_info;
1639                 ext_list = client_inf->extensions;
1640         } else {
1641                 ext_list = NULL;
1642         }
1643
1644         /*
1645          *      Grab the X509 extensions, and create attributes out of them.
1646          *      For laziness, we re-use the OpenSSL names
1647          */
1648         if (sk_X509_EXTENSION_num(ext_list) > 0) {
1649                 int i, len;
1650                 char *p;
1651                 BIO *out;
1652
1653                 out = BIO_new(BIO_s_mem());
1654                 strlcpy(subject, "TLS-Client-Cert-", sizeof(subject));
1655
1656                 for (i = 0; i < sk_X509_EXTENSION_num(ext_list); i++) {
1657                         ASN1_OBJECT *obj;
1658                         X509_EXTENSION *ext;
1659                         VALUE_PAIR *vp;
1660
1661                         ext = sk_X509_EXTENSION_value(ext_list, i);
1662
1663                         obj = X509_EXTENSION_get_object(ext);
1664                         i2a_ASN1_OBJECT(out, obj);
1665                         len = BIO_read(out, subject + 16 , sizeof(subject) - 16 - 1);
1666                         if (len <= 0) continue;
1667
1668                         subject[16 + len] = '\0';
1669
1670                         X509V3_EXT_print(out, ext, 0, 0);
1671                         len = BIO_read(out, issuer , sizeof(issuer) - 1);
1672                         if (len <= 0) continue;
1673
1674                         issuer[len] = '\0';
1675
1676                         /*
1677                          *      Mash the OpenSSL name to our name, and
1678                          *      create the attribute.
1679                          */
1680                         for (p = subject + 16; *p != '\0'; p++) {
1681                                 if (*p == ' ') *p = '-';
1682                         }
1683
1684                         vp = pairmake(NULL, certs, subject, issuer, T_OP_ADD);
1685                         if (vp) debug_pair_list(vp);
1686                 }
1687
1688                 BIO_free_all(out);
1689         }
1690
1691         switch (ctx->error) {
1692
1693         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
1694                 ERROR("issuer= %s\n", issuer);
1695                 break;
1696         case X509_V_ERR_CERT_NOT_YET_VALID:
1697         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
1698                 ERROR("notBefore=");
1699 #if 0
1700                 ASN1_TIME_print(bio_err, X509_get_notBefore(ctx->current_cert));
1701 #endif
1702                 break;
1703         case X509_V_ERR_CERT_HAS_EXPIRED:
1704         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
1705                 ERROR("notAfter=");
1706 #if 0
1707                 ASN1_TIME_print(bio_err, X509_get_notAfter(ctx->current_cert));
1708 #endif
1709                 break;
1710         }
1711
1712         /*
1713          *      If we're at the actual client cert, apply additional
1714          *      checks.
1715          */
1716         if (depth == 0) {
1717                 /*
1718                  *      If the conf tells us to, check cert issuer
1719                  *      against the specified value and fail
1720                  *      verification if they don't match.
1721                  */
1722                 if (conf->check_cert_issuer &&
1723                     (strcmp(issuer, conf->check_cert_issuer) != 0)) {
1724                         AUTH("rlm_eap_tls: Certificate issuer (%s) does not match specified value (%s)!", issuer, conf->check_cert_issuer);
1725                         my_ok = 0;
1726                 }
1727
1728                 /*
1729                  *      If the conf tells us to, check the CN in the
1730                  *      cert against xlat'ed value, but only if the
1731                  *      previous checks passed.
1732                  */
1733                 if (my_ok && conf->check_cert_cn) {
1734                         if (radius_xlat(cn_str, sizeof(cn_str), request, conf->check_cert_cn, NULL, NULL) < 0) {
1735                                 /* if this fails, fail the verification */
1736                                 my_ok = 0;
1737                         } else {
1738                                 RDEBUG2("checking certificate CN (%s) with xlat'ed value (%s)", common_name, cn_str);
1739                                 if (strcmp(cn_str, common_name) != 0) {
1740                                         AUTH("rlm_eap_tls: Certificate CN (%s) does not match specified value (%s)!", common_name, cn_str);
1741                                         my_ok = 0;
1742                                 }
1743                         }
1744                 } /* check_cert_cn */
1745
1746 #ifdef HAVE_OPENSSL_OCSP_H
1747                 if (my_ok && conf->ocsp_enable){
1748                         RDEBUG2("--> Starting OCSP Request");
1749                         if(X509_STORE_CTX_get1_issuer(&issuer_cert, ctx, client_cert)!=1) {
1750                                 ERROR("Couldn't get issuer_cert for %s", common_name);
1751                         }
1752                         my_ok = ocsp_check(ocsp_store, issuer_cert, client_cert, conf);
1753                 }
1754 #endif
1755
1756                 while (conf->verify_client_cert_cmd) {
1757                         char filename[256];
1758                         int fd;
1759                         FILE *fp;
1760
1761                         snprintf(filename, sizeof(filename), "%s/%s.client.XXXXXXXX",
1762                                  conf->verify_tmp_dir, progname);
1763                         fd = mkstemp(filename);
1764                         if (fd < 0) {
1765                                 RDEBUG("Failed creating file in %s: %s",
1766                                        conf->verify_tmp_dir, strerror(errno));
1767                                 break;
1768                         }
1769
1770                         fp = fdopen(fd, "w");
1771                         if (!fp) {
1772                                 RDEBUG("Failed opening file %s: %s",
1773                                        filename, strerror(errno));
1774                                 break;
1775                         }
1776
1777                         if (!PEM_write_X509(fp, client_cert)) {
1778                                 fclose(fp);
1779                                 RDEBUG("Failed writing certificate to file");
1780                                 goto do_unlink;
1781                         }
1782                         fclose(fp);
1783
1784                         if (!pairmake_packet("TLS-Client-Cert-Filename",
1785                                              filename, T_OP_SET)) {
1786                                 RDEBUG("Failed creating TLS-Client-Cert-Filename");
1787
1788                                 goto do_unlink;
1789                         }
1790
1791                         RDEBUG("Verifying client certificate: %s", conf->verify_client_cert_cmd);
1792                         if (radius_exec_program(request, conf->verify_client_cert_cmd, true, true, NULL, 0,
1793                                                 request->packet->vps, NULL) != 0) {
1794                                 AUTH("rlm_eap_tls: Certificate CN (%s) fails external verification!", common_name);
1795                                 my_ok = 0;
1796                         } else {
1797                                 RDEBUG("Client certificate CN %s passed external validation", common_name);
1798                         }
1799
1800                 do_unlink:
1801                         unlink(filename);
1802                         break;
1803                 }
1804
1805
1806         } /* depth == 0 */
1807
1808         if (debug_flag > 0) {
1809                 RDEBUG2("chain-depth=%d, ", depth);
1810                 RDEBUG2("error=%d", err);
1811
1812                 if (identity) RDEBUG2("--> User-Name = %s", *identity);
1813                 RDEBUG2("--> BUF-Name = %s", common_name);
1814                 RDEBUG2("--> subject = %s", subject);
1815                 RDEBUG2("--> issuer  = %s", issuer);
1816                 RDEBUG2("--> verify return:%d", my_ok);
1817         }
1818         return my_ok;
1819 }
1820
1821
1822 #ifdef HAVE_OPENSSL_OCSP_H
1823 /*
1824  *      Create Global X509 revocation store and use it to verify
1825  *      OCSP responses
1826  *
1827  *      - Load the trusted CAs
1828  *      - Load the trusted issuer certificates
1829  */
1830 static X509_STORE *init_revocation_store(fr_tls_server_conf_t *conf)
1831 {
1832         X509_STORE *store = NULL;
1833
1834         store = X509_STORE_new();
1835
1836         /* Load the CAs we trust */
1837         if (conf->ca_file || conf->ca_path)
1838                 if(!X509_STORE_load_locations(store, conf->ca_file, conf->ca_path)) {
1839                         ERROR("rlm_eap: X509_STORE error %s", ERR_error_string(ERR_get_error(), NULL));
1840                         ERROR("rlm_eap_tls: Error reading Trusted root CA list %s",conf->ca_file );
1841                         return NULL;
1842                 }
1843
1844 #ifdef X509_V_FLAG_CRL_CHECK
1845         if (conf->check_crl)
1846                 X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK);
1847 #endif
1848         return store;
1849 }
1850 #endif  /* HAVE_OPENSSL_OCSP_H */
1851
1852 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
1853 #ifndef OPENSSL_NO_ECDH
1854 static int set_ecdh_curve(SSL_CTX *ctx, char const *ecdh_curve)
1855 {
1856         int      nid;
1857         EC_KEY  *ecdh;
1858
1859         if (!ecdh_curve || !*ecdh_curve) return 0;
1860
1861         nid = OBJ_sn2nid(ecdh_curve);
1862         if (!nid) {
1863                 ERROR("Unknown ecdh_curve \"%s\"", ecdh_curve);
1864                 return -1;
1865         }
1866
1867         ecdh = EC_KEY_new_by_curve_name(nid);
1868         if (!ecdh) {
1869                 ERROR("Unable to create new curve \"%s\"", ecdh_curve);
1870                 return -1;
1871         }
1872
1873         SSL_CTX_set_tmp_ecdh(ctx, ecdh);
1874
1875         SSL_CTX_set_options(ctx, SSL_OP_SINGLE_ECDH_USE);
1876
1877         EC_KEY_free(ecdh);
1878
1879         return 0;
1880 }
1881 #endif
1882 #endif
1883
1884 /*
1885  * DIE OPENSSL DIE DIE DIE
1886  *
1887  * What a palaver, just to free some data attached the
1888  * session. We need to do this because the "remove" callback
1889  * is called when refcount > 0 sometimes, if another thread
1890  * is using the session
1891  */
1892 static void sess_free_vps(UNUSED void *parent, void *data_ptr,
1893                                 UNUSED CRYPTO_EX_DATA *ad, UNUSED int idx,
1894                                 UNUSED long argl, UNUSED void *argp)
1895 {
1896         VALUE_PAIR *vp = data_ptr;
1897         if (!vp) return;
1898
1899         DEBUG2("  Freeing cached session VPs %p", vp);
1900
1901         pairfree(&vp);
1902 }
1903
1904
1905 /*
1906  *      Create Global context SSL and use it in every new session
1907  *
1908  *      - Load the trusted CAs
1909  *      - Load the Private key & the certificate
1910  *      - Set the Context options & Verify options
1911  */
1912 static SSL_CTX *init_tls_ctx(fr_tls_server_conf_t *conf, int client)
1913 {
1914         SSL_CTX *ctx;
1915         X509_STORE *certstore;
1916         int verify_mode = SSL_VERIFY_NONE;
1917         int ctx_options = 0;
1918         int type;
1919
1920         /*
1921          *      Add all the default ciphers and message digests
1922          *      Create our context.
1923          */
1924         SSL_library_init();
1925         SSL_load_error_strings();
1926
1927         /*
1928          *      SHA256 is in all versions of OpenSSL, but isn't
1929          *      initialized by default.  It's needed for WiMAX
1930          *      certificates.
1931          */
1932 #ifdef HAVE_OPENSSL_EVP_SHA256
1933         EVP_add_digest(EVP_sha256());
1934 #endif
1935
1936         ctx = SSL_CTX_new(TLSv1_method());
1937
1938         /*
1939          * Save the config on the context so that callbacks which
1940          * only get SSL_CTX* e.g. session persistence, can get it
1941          */
1942         SSL_CTX_set_app_data(ctx, conf);
1943
1944         /*
1945          * Identify the type of certificates that needs to be loaded
1946          */
1947         if (conf->file_type) {
1948                 type = SSL_FILETYPE_PEM;
1949         } else {
1950                 type = SSL_FILETYPE_ASN1;
1951         }
1952
1953         /*
1954          * Set the password to load private key
1955          */
1956         if (conf->private_key_password) {
1957 #ifdef __APPLE__
1958                 /*
1959                  * We don't want to put the private key password in eap.conf, so  check
1960                  * for our special string which indicates we should get the password
1961                  * programmatically.
1962                  */
1963                 char const* special_string = "Apple:UseCertAdmin";
1964                 if (strncmp(conf->private_key_password,
1965                                         special_string,
1966                                         strlen(special_string)) == 0)
1967                 {
1968                         char cmd[256];
1969                         const long max_password_len = 128;
1970                         snprintf(cmd, sizeof(cmd) - 1,
1971                                          "/usr/sbin/certadmin --get-private-key-passphrase \"%s\"",
1972                                          conf->private_key_file);
1973
1974                         DEBUG2("rlm_eap: Getting private key passphrase using command \"%s\"", cmd);
1975
1976                         FILE* cmd_pipe = popen(cmd, "r");
1977                         if (!cmd_pipe) {
1978                                 ERROR("TLS: %s command failed.  Unable to get private_key_password", cmd);
1979                                 ERROR("Error reading private_key_file %s", conf->private_key_file);
1980                                 return NULL;
1981                         }
1982
1983                         talloc_free(conf->private_key_password);
1984                         conf->private_key_password = talloc_array(conf, char, max_password_len);
1985                         if (!conf->private_key_password) {
1986                                 ERROR("TLS: Can't allocate space for private_key_password");
1987                                 ERROR("TLS: Error reading private_key_file %s", conf->private_key_file);
1988                                 pclose(cmd_pipe);
1989                                 return NULL;
1990                         }
1991
1992                         fgets(conf->private_key_password, max_password_len, cmd_pipe);
1993                         pclose(cmd_pipe);
1994
1995                         /* Get rid of newline at end of password. */
1996                         conf->private_key_password[strlen(conf->private_key_password) - 1] = '\0';
1997                         DEBUG2("rlm_eap:  Password from command = \"%s\"", conf->private_key_password);
1998                 }
1999 #endif
2000                 SSL_CTX_set_default_passwd_cb_userdata(ctx, conf->private_key_password);
2001                 SSL_CTX_set_default_passwd_cb(ctx, cbtls_password);
2002         }
2003
2004 #ifdef PSK_MAX_IDENTITY_LEN
2005         if ((conf->psk_identity && !conf->psk_password) ||
2006             (!conf->psk_identity && conf->psk_password) ||
2007             (conf->psk_identity && !*conf->psk_identity) ||
2008             (conf->psk_password && !*conf->psk_password)) {
2009                 ERROR("Invalid PSK Configuration: psk_identity or psk_password are empty");
2010                 return NULL;
2011         }
2012
2013         if (conf->psk_identity) {
2014                 size_t psk_len, hex_len;
2015                 char buffer[PSK_MAX_PSK_LEN];
2016
2017                 if (conf->certificate_file ||
2018                     conf->private_key_password || conf->private_key_file ||
2019                     conf->ca_file || conf->ca_path) {
2020                         ERROR("When PSKs are used, No certificate configuration is permitted");
2021                         return NULL;
2022                 }
2023
2024                 if (client) {
2025                         SSL_CTX_set_psk_client_callback(ctx,
2026                                                         psk_client_callback);
2027                 } else {
2028                         SSL_CTX_set_psk_server_callback(ctx,
2029                                                         psk_server_callback);
2030                 }
2031
2032                 psk_len = strlen(conf->psk_password);
2033                 if (strlen(conf->psk_password) > (2 * PSK_MAX_PSK_LEN)) {
2034                         ERROR("psk_hexphrase is too long (max %d)",
2035                                PSK_MAX_PSK_LEN);
2036                         return NULL;
2037                 }
2038
2039                 hex_len = fr_hex2bin(conf->psk_password,
2040                                      (uint8_t *) buffer, psk_len);
2041                 if (psk_len != (2 * hex_len)) {
2042                         ERROR("psk_hexphrase is not all hex");
2043                         return NULL;
2044                 }
2045
2046                 goto post_ca;
2047         }
2048 #else
2049         (void) client;  /* -Wunused */
2050 #endif
2051
2052         /*
2053          *      Load our keys and certificates
2054          *
2055          *      If certificates are of type PEM then we can make use
2056          *      of cert chain authentication using openssl api call
2057          *      SSL_CTX_use_certificate_chain_file.  Please see how
2058          *      the cert chain needs to be given in PEM from
2059          *      openSSL.org
2060          */
2061         if (!conf->certificate_file) goto load_ca;
2062
2063         if (type == SSL_FILETYPE_PEM) {
2064                 if (!(SSL_CTX_use_certificate_chain_file(ctx, conf->certificate_file))) {
2065                         ERROR("Error reading certificate file %s:%s",
2066                                conf->certificate_file,
2067                                ERR_error_string(ERR_get_error(), NULL));
2068                         return NULL;
2069                 }
2070
2071         } else if (!(SSL_CTX_use_certificate_file(ctx, conf->certificate_file, type))) {
2072                 ERROR("Error reading certificate file %s:%s",
2073                        conf->certificate_file,
2074                        ERR_error_string(ERR_get_error(), NULL));
2075                 return NULL;
2076         }
2077
2078         /* Load the CAs we trust */
2079 load_ca:
2080         if (conf->ca_file || conf->ca_path) {
2081                 if (!SSL_CTX_load_verify_locations(ctx, conf->ca_file, conf->ca_path)) {
2082                         ERROR("rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
2083                         ERROR("rlm_eap_tls: Error reading Trusted root CA list %s",conf->ca_file );
2084                         return NULL;
2085                 }
2086         }
2087         if (conf->ca_file && *conf->ca_file) SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(conf->ca_file));
2088
2089         if (conf->private_key_file) {
2090                 if (!(SSL_CTX_use_PrivateKey_file(ctx, conf->private_key_file, type))) {
2091                         ERROR("Failed reading private key file %s:%s",
2092                                conf->private_key_file,
2093                                ERR_error_string(ERR_get_error(), NULL));
2094                         return NULL;
2095                 }
2096
2097                 /*
2098                  * Check if the loaded private key is the right one
2099                  */
2100                 if (!SSL_CTX_check_private_key(ctx)) {
2101                         ERROR("Private key does not match the certificate public key");
2102                         return NULL;
2103                 }
2104         }
2105
2106 #ifdef PSK_MAX_IDENTITY_LEN
2107 post_ca:
2108 #endif
2109
2110         /*
2111          *      Set ctx_options
2112          */
2113         ctx_options |= SSL_OP_NO_SSLv2;
2114         ctx_options |= SSL_OP_NO_SSLv3;
2115 #ifdef SSL_OP_NO_TICKET
2116         ctx_options |= SSL_OP_NO_TICKET ;
2117 #endif
2118
2119         /*
2120          *      SSL_OP_SINGLE_DH_USE must be used in order to prevent
2121          *      small subgroup attacks and forward secrecy. Always
2122          *      using
2123          *
2124          *      SSL_OP_SINGLE_DH_USE has an impact on the computer
2125          *      time needed during negotiation, but it is not very
2126          *      large.
2127          */
2128         ctx_options |= SSL_OP_SINGLE_DH_USE;
2129
2130         /*
2131          *      SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS to work around issues
2132          *      in Windows Vista client.
2133          *      http://www.openssl.org/~bodo/tls-cbc.txt
2134          *      http://www.nabble.com/(RADIATOR)-Radiator-Version-3.16-released-t2600070.html
2135          */
2136         ctx_options |= SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
2137
2138         SSL_CTX_set_options(ctx, ctx_options);
2139
2140         /*
2141          *      TODO: Set the RSA & DH
2142          *      SSL_CTX_set_tmp_rsa_callback(ctx, cbtls_rsa);
2143          *      SSL_CTX_set_tmp_dh_callback(ctx, cbtls_dh);
2144          */
2145
2146         /*
2147          *      set the message callback to identify the type of
2148          *      message.  For every new session, there can be a
2149          *      different callback argument.
2150          *
2151          *      SSL_CTX_set_msg_callback(ctx, cbtls_msg);
2152          */
2153
2154         /*
2155          *      Set eliptical curve crypto configuration.
2156          */
2157 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
2158 #ifndef OPENSSL_NO_ECDH
2159         if (set_ecdh_curve(ctx, conf->ecdh_curve) < 0) {
2160                 return NULL;
2161         }
2162 #endif
2163 #endif
2164
2165         /* Set Info callback */
2166         SSL_CTX_set_info_callback(ctx, cbtls_info);
2167
2168         /*
2169          *      Callbacks, etc. for session resumption.
2170          */
2171         if (conf->session_cache_enable) {
2172                 SSL_CTX_sess_set_new_cb(ctx, cbtls_new_session);
2173                 SSL_CTX_sess_set_get_cb(ctx, cbtls_get_session);
2174                 SSL_CTX_sess_set_remove_cb(ctx, cbtls_remove_session);
2175
2176                 SSL_CTX_set_quiet_shutdown(ctx, 1);
2177                 if (FR_TLS_EX_INDEX_VPS < 0)
2178                         FR_TLS_EX_INDEX_VPS = SSL_SESSION_get_ex_new_index(0, NULL, NULL, NULL, sess_free_vps);
2179         }
2180
2181         /*
2182          *      Check the certificates for revocation.
2183          */
2184 #ifdef X509_V_FLAG_CRL_CHECK
2185         if (conf->check_crl) {
2186           certstore = SSL_CTX_get_cert_store(ctx);
2187           if (certstore == NULL) {
2188             ERROR("rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
2189             ERROR("rlm_eap_tls: Error reading Certificate Store");
2190             return NULL;
2191           }
2192           X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK);
2193         }
2194 #endif
2195
2196         /*
2197          *      Set verify modes
2198          *      Always verify the peer certificate
2199          */
2200         verify_mode |= SSL_VERIFY_PEER;
2201         verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
2202         verify_mode |= SSL_VERIFY_CLIENT_ONCE;
2203         SSL_CTX_set_verify(ctx, verify_mode, cbtls_verify);
2204
2205         if (conf->verify_depth) {
2206                 SSL_CTX_set_verify_depth(ctx, conf->verify_depth);
2207         }
2208
2209         /* Load randomness */
2210         if (conf->random_file) {
2211                 if (!(RAND_load_file(conf->random_file, 1024*1024))) {
2212                         ERROR("rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
2213                         ERROR("rlm_eap_tls: Error loading randomness");
2214                         return NULL;
2215                 }
2216         }
2217
2218         /*
2219          * Set the cipher list if we were told to
2220          */
2221         if (conf->cipher_list) {
2222                 if (!SSL_CTX_set_cipher_list(ctx, conf->cipher_list)) {
2223                         ERROR("rlm_eap_tls: Error setting cipher list");
2224                         return NULL;
2225                 }
2226         }
2227
2228         /*
2229          *      Setup session caching
2230          */
2231         if (conf->session_cache_enable) {
2232                 /*
2233                  *      Create a unique context Id per EAP-TLS configuration.
2234                  */
2235                 if (conf->session_id_name) {
2236                         snprintf(conf->session_context_id,
2237                                  sizeof(conf->session_context_id),
2238                                  "FR eap %s",
2239                                  conf->session_id_name);
2240                 } else {
2241                         snprintf(conf->session_context_id,
2242                                  sizeof(conf->session_context_id),
2243                                  "FR eap %p", conf);
2244                 }
2245
2246                 /*
2247                  *      Cache it, and DON'T auto-clear it.
2248                  */
2249                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_SERVER | SSL_SESS_CACHE_NO_AUTO_CLEAR);
2250
2251                 SSL_CTX_set_session_id_context(ctx,
2252                                                (unsigned char *) conf->session_context_id,
2253                                                (unsigned int) strlen(conf->session_context_id));
2254
2255                 /*
2256                  *      Our timeout is in hours, this is in seconds.
2257                  */
2258                 SSL_CTX_set_timeout(ctx, conf->session_timeout * 3600);
2259
2260                 /*
2261                  *      Set the maximum number of entries in the
2262                  *      session cache.
2263                  */
2264                 SSL_CTX_sess_set_cache_size(ctx, conf->session_cache_size);
2265
2266         } else {
2267                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
2268         }
2269
2270         return ctx;
2271 }
2272
2273
2274 /*
2275  *      Free TLS client/server config
2276  *      Should not be called outside this code, as a callback is
2277  *      added to automatically free the data when the CONF_SECTION
2278  *      is freed.
2279  */
2280 static void tls_server_conf_free(fr_tls_server_conf_t *conf)
2281 {
2282         if (!conf) return;
2283
2284         if (conf->ctx) SSL_CTX_free(conf->ctx);
2285
2286 #ifdef HAVE_OPENSSL_OCSP_H
2287         if (conf->ocsp_store) X509_STORE_free(conf->ocsp_store);
2288         conf->ocsp_store = NULL;
2289 #endif
2290
2291 #ifndef NDEBUG
2292         memset(conf, 0, sizeof(*conf));
2293 #endif
2294         talloc_free(conf);
2295 }
2296
2297
2298 fr_tls_server_conf_t *tls_server_conf_parse(CONF_SECTION *cs)
2299 {
2300         fr_tls_server_conf_t *conf;
2301
2302         /*
2303          *      If cs has already been parsed there should be a cached copy
2304          *      of conf already stored, so just return that.
2305          */
2306         conf = cf_data_find(cs, "tls-conf");
2307         if (conf) {
2308                 DEBUG("Using cached TLS configuration from previous invocation");
2309                 return conf;
2310         }
2311
2312         conf = talloc_zero(cs, fr_tls_server_conf_t);
2313         if (!conf) {
2314                 ERROR("Out of memory");
2315                 return NULL;
2316         }
2317
2318         if (cf_section_parse(cs, conf, tls_server_config) < 0) {
2319         error:
2320                 tls_server_conf_free(conf);
2321                 return NULL;
2322         }
2323
2324         /*
2325          *      Save people from their own stupidity.
2326          */
2327         if (conf->fragment_size < 100) conf->fragment_size = 100;
2328
2329         if (!conf->private_key_file) {
2330                 ERROR("TLS Server requires a private key file");
2331                 goto error;
2332         }
2333
2334         if (!conf->certificate_file) {
2335                 ERROR("TLS Server requires a certificate file");
2336                 goto error;
2337         }
2338
2339         /*
2340          *      Initialize TLS
2341          */
2342         conf->ctx = init_tls_ctx(conf, 0);
2343         if (conf->ctx == NULL) {
2344                 goto error;
2345         }
2346
2347 #ifdef HAVE_OPENSSL_OCSP_H
2348         /*
2349          *      Initialize OCSP Revocation Store
2350          */
2351         if (conf->ocsp_enable) {
2352                 conf->ocsp_store = init_revocation_store(conf);
2353                 if (conf->ocsp_store == NULL) goto error;
2354         }
2355 #endif /*HAVE_OPENSSL_OCSP_H*/
2356
2357         if (load_dh_params(conf->ctx, conf->dh_file) < 0) {
2358                 goto error;
2359         }
2360
2361         if (generate_eph_rsa_key(conf->ctx) < 0) {
2362                 goto error;
2363         }
2364
2365         if (conf->verify_tmp_dir) {
2366                 if (chmod(conf->verify_tmp_dir, S_IRWXU) < 0) {
2367                         ERROR("Failed changing permissions on %s: %s", conf->verify_tmp_dir, strerror(errno));
2368                         goto error;
2369                 }
2370         }
2371
2372         if (conf->verify_client_cert_cmd && !conf->verify_tmp_dir) {
2373                 ERROR("You MUST set the verify directory in order to use verify_client_cmd");
2374                 goto error;
2375         }
2376
2377         /*
2378          *      Cache conf in cs in case we're asked to parse this again.
2379          */
2380         cf_data_add(cs, "tls-conf", conf, (void *)(void *) tls_server_conf_free);
2381
2382         return conf;
2383 }
2384
2385 fr_tls_server_conf_t *tls_client_conf_parse(CONF_SECTION *cs)
2386 {
2387         fr_tls_server_conf_t *conf;
2388
2389         conf = cf_data_find(cs, "tls-conf");
2390         if (conf) {
2391                 DEBUG("Using cached TLS configuration from previous invocation");
2392                 return conf;
2393         }
2394
2395         conf = talloc_zero(cs, fr_tls_server_conf_t);
2396         if (!conf) {
2397                 ERROR("Out of memory");
2398                 return NULL;
2399         }
2400
2401         if (cf_section_parse(cs, conf, tls_client_config) < 0) {
2402         error:
2403                 tls_server_conf_free(conf);
2404                 return NULL;
2405         }
2406
2407         /*
2408          *      Save people from their own stupidity.
2409          */
2410         if (conf->fragment_size < 100) conf->fragment_size = 100;
2411
2412         /*
2413          *      Initialize TLS
2414          */
2415         conf->ctx = init_tls_ctx(conf, 1);
2416         if (conf->ctx == NULL) {
2417                 goto error;
2418         }
2419
2420         if (load_dh_params(conf->ctx, conf->dh_file) < 0) {
2421                 goto error;
2422         }
2423
2424         if (generate_eph_rsa_key(conf->ctx) < 0) {
2425                 goto error;
2426         }
2427
2428         cf_data_add(cs, "tls-conf", conf, (void *)(void *) tls_server_conf_free);
2429
2430         return conf;
2431 }
2432
2433 int tls_success(tls_session_t *ssn, REQUEST *request)
2434 {
2435         VALUE_PAIR *vp, *vps = NULL;
2436         fr_tls_server_conf_t *conf;
2437
2438         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CONF);
2439         rad_assert(conf != NULL);
2440
2441         /*
2442          *      If there's no session resumption, delete the entry
2443          *      from the cache.  This means either it's disabled
2444          *      globally for this SSL context, OR we were told to
2445          *      disable it for this user.
2446          *
2447          *      This also means you can't turn it on just for one
2448          *      user.
2449          */
2450         if ((!ssn->allow_session_resumption) ||
2451             (((vp = pairfind(request->config_items, 1127, 0, TAG_ANY)) != NULL) &&
2452              (vp->vp_integer == 0))) {
2453                 SSL_CTX_remove_session(ssn->ctx,
2454                                        ssn->ssl->session);
2455                 ssn->allow_session_resumption = 0;
2456
2457                 /*
2458                  *      If we're in a resumed session and it's
2459                  *      not allowed,
2460                  */
2461                 if (SSL_session_reused(ssn->ssl)) {
2462                         RDEBUG("FAIL: Forcibly stopping session resumption as it is not allowed.");
2463                         return -1;
2464                 }
2465
2466                 /*
2467                  *      Else resumption IS allowed, so we store the
2468                  *      user data in the cache.
2469                  */
2470         } else if (!SSL_session_reused(ssn->ssl)) {
2471                 size_t size;
2472                 VALUE_PAIR **certs;
2473                 char buffer[2 * MAX_SESSION_SIZE + 1];
2474
2475                 size = ssn->ssl->session->session_id_length;
2476                 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
2477
2478                 fr_bin2hex(ssn->ssl->session->session_id, buffer, size);
2479
2480                 vp = paircopy2(NULL, request->reply->vps, PW_USER_NAME, 0, TAG_ANY);
2481                 if (vp) pairadd(&vps, vp);
2482
2483                 vp = paircopy2(NULL, request->packet->vps, PW_STRIPPED_USER_NAME, 0, TAG_ANY);
2484                 if (vp) pairadd(&vps, vp);
2485
2486                 vp = paircopy2(NULL, request->reply->vps, PW_CACHED_SESSION_POLICY, 0, TAG_ANY);
2487                 if (vp) pairadd(&vps, vp);
2488
2489                 certs = (VALUE_PAIR **)SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CERTS);
2490
2491                 /*
2492                  *      Hmm... the certs should probably be session data.
2493                  */
2494                 if (certs) {
2495                         /*
2496                          *      @todo: some go into reply, others into
2497                          *      request
2498                          */
2499                         pairadd(&vps, paircopy(NULL, *certs));
2500                 }
2501
2502                 if (vps) {
2503                         RDEBUG2("Saving session %s vps %p in the cache", buffer, vps);
2504                         SSL_SESSION_set_ex_data(ssn->ssl->session,
2505                                                 FR_TLS_EX_INDEX_VPS, vps);
2506                         if (conf->session_cache_path) {
2507                                 /* write the VPs to the cache file */
2508                                 char filename[256], buf[1024];
2509                                 FILE *vp_file;
2510
2511                                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
2512                                         conf->session_cache_path, FR_DIR_SEP, buffer
2513                                         );
2514                                 vp_file = fopen(filename, "w");
2515                                 if (vp_file == NULL) {
2516                                         RDEBUG2("Could not write session VPs to persistent cache: %s", strerror(errno));
2517                                 } else {
2518                                         vp_cursor_t cursor;
2519                                         /* generate a dummy user-style entry which is easy to read back */
2520                                         fprintf(vp_file, "# SSL cached session\n");
2521                                         fprintf(vp_file, "%s\n", buffer);
2522                                         for (vp = paircursor(&cursor, &vps);
2523                                              vp;
2524                                              vp = pairnext(&cursor)) {
2525                                                 vp_prints(buf, sizeof(buf), vp);
2526                                                 fprintf(vp_file, "\t%s%s\n", buf, ",");
2527                                         }
2528                                         fclose(vp_file);
2529                                 }
2530                         }
2531                 } else {
2532                         RWDEBUG2("No information to cache: session caching will be disabled for session %s", buffer);
2533                         SSL_CTX_remove_session(ssn->ctx,
2534                                                ssn->ssl->session);
2535                 }
2536
2537                 /*
2538                  *      Else the session WAS allowed.  Copy the cached
2539                  *      reply.
2540                  */
2541         } else {
2542                 size_t size;
2543                 char buffer[2 * MAX_SESSION_SIZE + 1];
2544
2545                 size = ssn->ssl->session->session_id_length;
2546                 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
2547
2548                 fr_bin2hex(ssn->ssl->session->session_id, buffer, size);
2549
2550                 vps = SSL_SESSION_get_ex_data(ssn->ssl->session,
2551                                              FR_TLS_EX_INDEX_VPS);
2552                 if (!vps) {
2553                         RWDEBUG("No information in cached session %s", buffer);
2554                         return -1;
2555
2556                 } else {
2557                         vp_cursor_t cursor;
2558
2559                         RDEBUG("Adding cached attributes for session %s:", buffer);
2560                         debug_pair_list(vps);
2561
2562                         for (vp = paircursor(&cursor, &vps);
2563                              vp;
2564                              vp = pairnext(&cursor)) {
2565                                 /*
2566                                  *      TLS-* attrs get added back to
2567                                  *      the request list.
2568                                  */
2569                                 if ((vp->da->vendor == 0) &&
2570                                     (vp->da->attr >= 1910) &&
2571                                     (vp->da->attr < 1929)) {
2572                                         pairadd(&request->packet->vps,
2573                                                 paircopyvp(request->packet, vp));
2574                                 } else {
2575                                         pairadd(&request->reply->vps,
2576                                                 paircopyvp(request->packet, vp));
2577                                 }
2578                         }
2579
2580                         if (conf->session_cache_path) {
2581                                 /* "touch" the cached session/vp file */
2582                                 char filename[256];
2583
2584                                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
2585                                         conf->session_cache_path, FR_DIR_SEP, buffer
2586                                         );
2587                                 utime(filename, NULL);
2588                                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
2589                                         conf->session_cache_path, FR_DIR_SEP, buffer
2590                                         );
2591                                 utime(filename, NULL);
2592                         }
2593
2594                         /*
2595                          *      Mark the request as resumed.
2596                          */
2597                         pairmake_packet("EAP-Session-Resumed", "1", T_OP_SET);
2598                 }
2599         }
2600
2601         return 0;
2602 }
2603
2604
2605 void tls_fail(tls_session_t *ssn)
2606 {
2607         /*
2608          *      Force the session to NOT be cached.
2609          */
2610         SSL_CTX_remove_session(ssn->ctx, ssn->ssl->session);
2611 }
2612
2613 fr_tls_status_t tls_application_data(tls_session_t *ssn,
2614                                      REQUEST *request)
2615
2616 {
2617         int err;
2618
2619         /*
2620          *      Decrypt the complete record.
2621          */
2622         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data,
2623                         ssn->dirty_in.used);
2624         if (err != (int) ssn->dirty_in.used) {
2625                 record_init(&ssn->dirty_in);
2626                 RDEBUG("Failed writing %d to SSL BIO: %d",
2627                        ssn->dirty_in.used, err);
2628                 return FR_TLS_FAIL;
2629         }
2630
2631         /*
2632          *      Clear the dirty buffer now that we are done with it
2633          *      and init the clean_out buffer to store decrypted data
2634          */
2635         record_init(&ssn->dirty_in);
2636         record_init(&ssn->clean_out);
2637
2638         /*
2639          *      Read (and decrypt) the tunneled data from the
2640          *      SSL session, and put it into the decrypted
2641          *      data buffer.
2642          */
2643         err = SSL_read(ssn->ssl, ssn->clean_out.data,
2644                        sizeof(ssn->clean_out.data));
2645
2646         if (err < 0) {
2647                 int code;
2648
2649                 RDEBUG("SSL_read Error");
2650
2651                 code = SSL_get_error(ssn->ssl, err);
2652                 switch (code) {
2653                 case SSL_ERROR_WANT_READ:
2654                         DEBUG("Error in fragmentation logic: SSL_WANT_READ");
2655                         return FR_TLS_MORE_FRAGMENTS;
2656
2657                 case SSL_ERROR_WANT_WRITE:
2658                         DEBUG("Error in fragmentation logic: SSL_WANT_WRITE");
2659                         break;
2660
2661                 default:
2662                         DEBUG("Error in fragmentation logic: ?");
2663
2664                         /*
2665                          *      FIXME: Call int_ssl_check?
2666                          */
2667                         break;
2668                 }
2669                 return FR_TLS_FAIL;
2670         }
2671
2672         if (err == 0) {
2673                 RWDEBUG("No data inside of the tunnel.");
2674         }
2675
2676         /*
2677          *      Passed all checks, successfully decrypted data
2678          */
2679         ssn->clean_out.used = err;
2680
2681         return FR_TLS_OK;
2682 }
2683
2684
2685 /*
2686  * Acknowledge received is for one of the following messages sent earlier
2687  * 1. Handshake completed Message, so now send, EAP-Success
2688  * 2. Alert Message, now send, EAP-Failure
2689  * 3. Fragment Message, now send, next Fragment
2690  */
2691 fr_tls_status_t tls_ack_handler(tls_session_t *ssn, REQUEST *request)
2692 {
2693         RDEBUG2("Received TLS ACK");
2694
2695         if (ssn == NULL){
2696                 RERROR("FAIL: Unexpected ACK received.  Could not obtain session information.");
2697                 return FR_TLS_INVALID;
2698         }
2699         if (ssn->info.initialized == 0) {
2700                 RDEBUG("No SSL info available. Waiting for more SSL data.");
2701                 return FR_TLS_REQUEST;
2702         }
2703         if ((ssn->info.content_type == handshake) &&
2704             (ssn->info.origin == 0)) {
2705                 RERROR("FAIL: ACK without earlier message.");
2706                 return FR_TLS_INVALID;
2707         }
2708
2709         switch (ssn->info.content_type) {
2710         case alert:
2711                 RDEBUG2("ACK alert");
2712                 return FR_TLS_FAIL;
2713
2714         case handshake:
2715                 if ((ssn->info.handshake_type == finished) &&
2716                     (ssn->dirty_out.used == 0)) {
2717                         RDEBUG2("ACK handshake is finished");
2718
2719                         /*
2720                          *      From now on all the content is
2721                          *      application data set it here as nobody else
2722                          *      sets it.
2723                          */
2724                         ssn->info.content_type = application_data;
2725                         return FR_TLS_SUCCESS;
2726                 } /* else more data to send */
2727
2728                 RDEBUG2("ACK handshake fragment handler");
2729                 /* Fragmentation handler, send next fragment */
2730                 return FR_TLS_REQUEST;
2731
2732         case application_data:
2733                 RDEBUG2("ACK handshake fragment handler in application data");
2734                 return FR_TLS_REQUEST;
2735
2736                 /*
2737                  *      For the rest of the conditions, switch over
2738                  *      to the default section below.
2739                  */
2740         default:
2741                 RDEBUG2("ACK default");
2742                 RERROR("Invalid ACK received: %d",
2743                        ssn->info.content_type);
2744                 return FR_TLS_INVALID;
2745         }
2746 }
2747
2748 #endif  /* WITH_TLS */
2749