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 /* record */
  54 static void             record_init(record_t *buf);
  55 static void             record_close(record_t *buf);
  56 static unsigned int     record_plus(record_t *buf, void const *ptr,
  57                                     unsigned int size);
  58 static unsigned int     record_minus(record_t *buf, void *ptr,
  59                                      unsigned int size);
  60
  61 #ifdef PSK_MAX_IDENTITY_LEN
  62 static unsigned int psk_server_callback(SSL *ssl, char const *identity,
  63                                         unsigned char *psk,
  64                                         unsigned int max_psk_len)
  65 {
  66         unsigned int psk_len;
  67         fr_tls_server_conf_t *conf;
  68
  69         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl,
  70                                                        FR_TLS_EX_INDEX_CONF);
  71         if (!conf) return 0;
  72
  73         /*
  74          *      FIXME: Look up the PSK password based on the identity!
  75          */
  76         if (strcmp(identity, conf->psk_identity) != 0) {
  77                 return 0;
  78         }
  79
  80         psk_len = strlen(conf->psk_password);
  81         if (psk_len > (2 * max_psk_len)) return 0;
  82
  83         return fr_hex2bin(psk, conf->psk_password, psk_len);
  84 }
  85
  86 static unsigned int psk_client_callback(SSL *ssl, UNUSED char const *hint,
  87                                         char *identity, unsigned int max_identity_len,
  88                                         unsigned char *psk, unsigned int max_psk_len)
  89 {
  90         unsigned int psk_len;
  91         fr_tls_server_conf_t *conf;
  92
  93         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl,
  94                                                        FR_TLS_EX_INDEX_CONF);
  95         if (!conf) return 0;
  96
  97         psk_len = strlen(conf->psk_password);
  98         if (psk_len > (2 * max_psk_len)) return 0;
  99
 100         strlcpy(identity, conf->psk_identity, max_identity_len);
 101
 102         return fr_hex2bin(psk, conf->psk_password, psk_len);
 103 }
 104
 105 #endif
 106
 107 tls_session_t *tls_new_client_session(fr_tls_server_conf_t *conf, int fd)
 108 {
 109         int verify_mode;
 110         tls_session_t *ssn = NULL;
 111
 112         ssn = talloc_zero(conf, tls_session_t);
 113         if (!ssn) return NULL;
 114
 115         ssn->ctx = conf->ctx;
 116
 117         SSL_CTX_set_mode(ssn->ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER | SSL_MODE_AUTO_RETRY);
 118
 119         ssn->ssl = SSL_new(ssn->ctx);
 120         rad_assert(ssn->ssl != NULL);
 121
 122         /*
 123          *      Add the message callback to identify what type of
 124          *      message/handshake is passed
 125          */
 126         SSL_set_msg_callback(ssn->ssl, cbtls_msg);
 127         SSL_set_msg_callback_arg(ssn->ssl, ssn);
 128         SSL_set_info_callback(ssn->ssl, cbtls_info);
 129
 130         /*
 131          *      Always verify the peer certificate.
 132          */
 133         DEBUG2("Requiring Server certificate");
 134         verify_mode = SSL_VERIFY_PEER;
 135         verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
 136         SSL_set_verify(ssn->ssl, verify_mode, cbtls_verify);
 137
 138         SSL_set_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CONF, (void *)conf);
 139         SSL_set_ex_data(ssn->ssl, FR_TLS_EX_INDEX_SSN, (void *)ssn);
 140         SSL_set_fd(ssn->ssl, fd);
 141         if (SSL_connect(ssn->ssl) <= 0) {
 142                 int err;
 143                 while ((err = ERR_get_error())) {
 144                         DEBUG("OpenSSL Err says %s",
 145                               ERR_error_string(err, NULL));
 146                 }
 147                 SSL_free(ssn->ssl);
 148                 talloc_free(ssn);
 149                 return NULL;
 150         }
 151
 152         ssn->offset = conf->fragment_size;
 153
 154         return ssn;
 155 }
 156
 157 tls_session_t *tls_new_session(fr_tls_server_conf_t *conf, REQUEST *request,
 158                                int client_cert)
 159 {
 160         tls_session_t *state = NULL;
 161         SSL *new_tls = NULL;
 162         int             verify_mode = 0;
 163         VALUE_PAIR      *vp;
 164
 165         rad_assert(request != NULL);
 166
 167         /*
 168          *      Manually flush the sessions every so often.  If HALF
 169          *      of the session lifetime has passed since we last
 170          *      flushed, then flush it again.
 171          *
 172          *      FIXME: Also do it every N sessions?
 173          */
 174         if (conf->session_cache_enable &&
 175             ((conf->session_last_flushed + (conf->session_timeout * 1800)) <= request->timestamp)){
 176                 RDEBUG2("Flushing SSL sessions (of #%ld)",
 177                         SSL_CTX_sess_number(conf->ctx));
 178
 179                 SSL_CTX_flush_sessions(conf->ctx, request->timestamp);
 180                 conf->session_last_flushed = request->timestamp;
 181         }
 182
 183         if ((new_tls = SSL_new(conf->ctx)) == NULL) {
 184                 ERROR("SSL: Error creating new SSL: %s",
 185                        ERR_error_string(ERR_get_error(), NULL));
 186                 return NULL;
 187         }
 188
 189         /* We use the SSL's "app_data" to indicate a call-back */
 190         SSL_set_app_data(new_tls, NULL);
 191
 192         state = talloc_zero(conf, tls_session_t);
 193         session_init(state);
 194
 195         state->ctx = conf->ctx;
 196         state->ssl = new_tls;
 197
 198         /*
 199          *      Initialize callbacks
 200          */
 201         state->record_init = record_init;
 202         state->record_close = record_close;
 203         state->record_plus = record_plus;
 204         state->record_minus = record_minus;
 205
 206         /*
 207          *      Create & hook the BIOs to handle the dirty side of the
 208          *      SSL.  This is *very important* as we want to handle
 209          *      the transmission part.  Now the only IO interface
 210          *      that SSL is aware of, is our defined BIO buffers.
 211          *
 212          *      This means that all SSL IO is done to/from memory,
 213          *      and we can update those BIOs from the packets we've
 214          *      received.
 215          */
 216         state->into_ssl = BIO_new(BIO_s_mem());
 217         state->from_ssl = BIO_new(BIO_s_mem());
 218         SSL_set_bio(state->ssl, state->into_ssl, state->from_ssl);
 219
 220         /*
 221          *      Add the message callback to identify what type of
 222          *      message/handshake is passed
 223          */
 224         SSL_set_msg_callback(new_tls, cbtls_msg);
 225         SSL_set_msg_callback_arg(new_tls, state);
 226         SSL_set_info_callback(new_tls, cbtls_info);
 227
 228         /*
 229          *      In Server mode we only accept.
 230          */
 231         SSL_set_accept_state(state->ssl);
 232
 233         /*
 234          *      Verify the peer certificate, if asked.
 235          */
 236         if (client_cert) {
 237                 RDEBUG2("Requiring client certificate");
 238                 verify_mode = SSL_VERIFY_PEER;
 239                 verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
 240                 verify_mode |= SSL_VERIFY_CLIENT_ONCE;
 241         }
 242         SSL_set_verify(state->ssl, verify_mode, cbtls_verify);
 243
 244         SSL_set_ex_data(state->ssl, FR_TLS_EX_INDEX_CONF, (void *)conf);
 245         SSL_set_ex_data(state->ssl, FR_TLS_EX_INDEX_SSN, (void *)state);
 246         state->length_flag = conf->include_length;
 247
 248         /*
 249          *      We use default fragment size, unless the Framed-MTU
 250          *      tells us it's too big.  Note that we do NOT account
 251          *      for the EAP-TLS headers if conf->fragment_size is
 252          *      large, because that config item looks to be confusing.
 253          *
 254          *      i.e. it should REALLY be called MTU, and the code here
 255          *      should figure out what that means for TLS fragment size.
 256          *      asking the administrator to know the internal details
 257          *      of EAP-TLS in order to calculate fragment sizes is
 258          *      just too much.
 259          */
 260         state->offset = conf->fragment_size;
 261         vp = pairfind(request->packet->vps, PW_FRAMED_MTU, 0, TAG_ANY);
 262         if (vp && (vp->vp_integer > 100) && (vp->vp_integer < state->offset)) {
 263                 state->offset = vp->vp_integer;
 264         }
 265
 266         if (conf->session_cache_enable) {
 267                 state->allow_session_resumption = 1; /* otherwise it's zero */
 268         }
 269
 270         RDEBUG2("Initiate");
 271
 272         return state;
 273 }
 274
 275 /*
 276  *      Print out some text describing the error.
 277  */
 278 static int int_ssl_check(REQUEST *request, SSL *s, int ret, char const *text)
 279 {
 280         int e;
 281         unsigned long l;
 282
 283         if ((l = ERR_get_error()) != 0) {
 284                 char const *p = ERR_error_string(l, NULL);
 285
 286                 if (request && p) REDEBUG("SSL says: %s", p);
 287         }
 288         e = SSL_get_error(s, ret);
 289
 290         switch(e) {
 291                 /*
 292                  *      These seem to be harmless and already "dealt
 293                  *      with" by our non-blocking environment. NB:
 294                  *      "ZERO_RETURN" is the clean "error"
 295                  *      indicating a successfully closed SSL
 296                  *      tunnel. We let this happen because our IO
 297                  *      loop should not appear to have broken on
 298                  *      this condition - and outside the IO loop, the
 299                  *      "shutdown" state is checked.
 300                  *
 301                  *      Don't print anything if we ignore the error.
 302                  */
 303         case SSL_ERROR_NONE:
 304         case SSL_ERROR_WANT_READ:
 305         case SSL_ERROR_WANT_WRITE:
 306         case SSL_ERROR_WANT_X509_LOOKUP:
 307         case SSL_ERROR_ZERO_RETURN:
 308                 break;
 309
 310                 /*
 311                  *      These seem to be indications of a genuine
 312                  *      error that should result in the SSL tunnel
 313                  *      being regarded as "dead".
 314                  */
 315         case SSL_ERROR_SYSCALL:
 316                 ERROR("SSL: %s failed in a system call (%d), TLS session fails.",
 317                        text, ret);
 318                 return 0;
 319
 320         case SSL_ERROR_SSL:
 321                 ERROR("SSL: %s failed inside of TLS (%d), TLS session fails.",
 322                        text, ret);
 323                 return 0;
 324
 325         default:
 326                 /*
 327                  *      For any other errors that (a) exist, and (b)
 328                  *      crop up - we need to interpret what to do with
 329                  *      them - so "politely inform" the caller that
 330                  *      the code needs updating here.
 331                  */
 332                 ERROR("SSL: FATAL SSL error ..... %d\n", e);
 333                 return 0;
 334         }
 335
 336         return 1;
 337 }
 338
 339 /*
 340  * We are the server, we always get the dirty data
 341  * (Handshake data is also considered as dirty data)
 342  * During handshake, since SSL API handles itself,
 343  * After clean-up, dirty_out will be filled with
 344  * the data required for handshaking. So we check
 345  * if dirty_out is empty then we simply send it back.
 346  * As of now, if handshake is successful, then we keep going,
 347  * otherwise we fail.
 348  *
 349  * Fill the Bio with the dirty data to clean it
 350  * Get the cleaned data from SSL, if it is not Handshake data
 351  */
 352 int tls_handshake_recv(REQUEST *request, tls_session_t *ssn)
 353 {
 354         int err;
 355
 356         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data, ssn->dirty_in.used);
 357         if (err != (int) ssn->dirty_in.used) {
 358                 RDEBUG("Failed writing %d to SSL BIO: %d", ssn->dirty_in.used,
 359                         err);
 360                 record_init(&ssn->dirty_in);
 361                 return 0;
 362         }
 363         record_init(&ssn->dirty_in);
 364
 365         err = SSL_read(ssn->ssl, ssn->clean_out.data + ssn->clean_out.used,
 366                        sizeof(ssn->clean_out.data) - ssn->clean_out.used);
 367         if (err > 0) {
 368                 ssn->clean_out.used += err;
 369                 return 1;
 370         }
 371
 372         if (!int_ssl_check(request, ssn->ssl, err, "SSL_read")) {
 373                 return 0;
 374         }
 375
 376         /* Some Extra STATE information for easy debugging */
 377         if (SSL_is_init_finished(ssn->ssl)) {
 378                 DEBUG2("SSL Connection Established\n");
 379         }
 380         if (SSL_in_init(ssn->ssl)) {
 381                 DEBUG2("In SSL Handshake Phase\n");
 382         }
 383         if (SSL_in_before(ssn->ssl)) {
 384                 DEBUG2("Before SSL Handshake Phase\n");
 385         }
 386         if (SSL_in_accept_init(ssn->ssl)) {
 387                 DEBUG2("In SSL Accept mode \n");
 388         }
 389         if (SSL_in_connect_init(ssn->ssl)) {
 390                 DEBUG2("In SSL Connect mode \n");
 391         }
 392
 393         err = BIO_ctrl_pending(ssn->from_ssl);
 394         if (err > 0) {
 395                 err = BIO_read(ssn->from_ssl, ssn->dirty_out.data,
 396                                sizeof(ssn->dirty_out.data));
 397                 if (err > 0) {
 398                         ssn->dirty_out.used = err;
 399
 400                 } else if (BIO_should_retry(ssn->from_ssl)) {
 401                         record_init(&ssn->dirty_in);
 402                         DEBUG2("  tls: Asking for more data in tunnel");
 403                         return 1;
 404
 405                 } else {
 406                         int_ssl_check(request, ssn->ssl, err, "BIO_read");
 407                         record_init(&ssn->dirty_in);
 408                         return 0;
 409                 }
 410         } else {
 411                 DEBUG2("SSL Application Data");
 412                 /* Its clean application data, do whatever we want */
 413                 record_init(&ssn->clean_out);
 414         }
 415
 416         /* We are done with dirty_in, reinitialize it */
 417         record_init(&ssn->dirty_in);
 418         return 1;
 419 }
 420
 421 /*
 422  *      Take cleartext user data, and encrypt it into the output buffer,
 423  *      to send to the client at the other end of the SSL connection.
 424  */
 425 int tls_handshake_send(REQUEST *request, tls_session_t *ssn)
 426 {
 427         int err;
 428
 429         /*
 430          *      If there's un-encrypted data in 'clean_in', then write
 431          *      that data to the SSL session, and then call the BIO function
 432          *      to get that encrypted data from the SSL session, into
 433          *      a buffer which we can then package into an EAP packet.
 434          *
 435          *      Based on Server's logic this clean_in is expected to
 436          *      contain the data to send to the client.
 437          */
 438         if (ssn->clean_in.used > 0) {
 439                 int written;
 440
 441                 written = SSL_write(ssn->ssl, ssn->clean_in.data, ssn->clean_in.used);
 442                 record_minus(&ssn->clean_in, NULL, written);
 443
 444                 /* Get the dirty data from Bio to send it */
 445                 err = BIO_read(ssn->from_ssl, ssn->dirty_out.data,
 446                                sizeof(ssn->dirty_out.data));
 447                 if (err > 0) {
 448                         ssn->dirty_out.used = err;
 449                 } else {
 450                         int_ssl_check(request, ssn->ssl, err, "handshake_send");
 451                 }
 452         }
 453
 454         return 1;
 455 }
 456
 457 void session_init(tls_session_t *ssn)
 458 {
 459         ssn->ssl = NULL;
 460         ssn->into_ssl = ssn->from_ssl = NULL;
 461         record_init(&ssn->clean_in);
 462         record_init(&ssn->clean_out);
 463         record_init(&ssn->dirty_in);
 464         record_init(&ssn->dirty_out);
 465
 466         memset(&ssn->info, 0, sizeof(ssn->info));
 467
 468         ssn->offset = 0;
 469         ssn->fragment = 0;
 470         ssn->tls_msg_len = 0;
 471         ssn->length_flag = 0;
 472         ssn->opaque = NULL;
 473         ssn->free_opaque = NULL;
 474 }
 475
 476 void session_close(tls_session_t *ssn)
 477 {
 478         SSL_set_quiet_shutdown(ssn->ssl, 1);
 479         SSL_shutdown(ssn->ssl);
 480
 481         if (ssn->ssl) {
 482                 SSL_free(ssn->ssl);
 483                 ssn->ssl = NULL;
 484         }
 485
 486         record_close(&ssn->clean_in);
 487         record_close(&ssn->clean_out);
 488         record_close(&ssn->dirty_in);
 489         record_close(&ssn->dirty_out);
 490         session_init(ssn);
 491 }
 492
 493 void session_free(void *ssn)
 494 {
 495         tls_session_t *sess = (tls_session_t *)ssn;
 496
 497         if (!ssn) return;
 498
 499         /*
 500          *      Free any opaque TTLS or PEAP data.
 501          */
 502         if ((sess->opaque) && (sess->free_opaque)) {
 503                 sess->free_opaque(sess->opaque);
 504                 sess->opaque = NULL;
 505         }
 506
 507         session_close(sess);
 508
 509         talloc_free(sess);
 510 }
 511
 512 static void record_init(record_t *rec)
 513 {
 514         rec->used = 0;
 515 }
 516
 517 static void record_close(record_t *rec)
 518 {
 519         rec->used = 0;
 520 }
 521
 522
 523 /*
 524  *      Copy data to the intermediate buffer, before we send
 525  *      it somewhere.
 526  */
 527 static unsigned int record_plus(record_t *rec, void const *ptr,
 528                                 unsigned int size)
 529 {
 530         unsigned int added = MAX_RECORD_SIZE - rec->used;
 531
 532         if(added > size)
 533                 added = size;
 534         if(added == 0)
 535                 return 0;
 536         memcpy(rec->data + rec->used, ptr, added);
 537         rec->used += added;
 538         return added;
 539 }
 540
 541 /*
 542  *      Take data from the buffer, and give it to the caller.
 543  */
 544 static unsigned int record_minus(record_t *rec, void *ptr,
 545                                  unsigned int size)
 546 {
 547         unsigned int taken = rec->used;
 548
 549         if(taken > size)
 550                 taken = size;
 551         if(taken == 0)
 552                 return 0;
 553         if(ptr)
 554                 memcpy(ptr, rec->data, taken);
 555         rec->used -= taken;
 556
 557         /*
 558          *      This is pretty bad...
 559          */
 560         if(rec->used > 0)
 561                 memmove(rec->data, rec->data + taken, rec->used);
 562         return taken;
 563 }
 564
 565 void tls_session_information(tls_session_t *tls_session)
 566 {
 567         char const *str_write_p, *str_version, *str_content_type = "";
 568         char const *str_details1 = "", *str_details2= "";
 569         REQUEST *request;
 570
 571         /*
 572          *      Don't print this out in the normal course of
 573          *      operations.
 574          */
 575         if (debug_flag == 0) {
 576                 return;
 577         }
 578
 579         str_write_p = tls_session->info.origin ? ">>>" : "<<<";
 580
 581         switch (tls_session->info.version) {
 582         case SSL2_VERSION:
 583                 str_version = "SSL 2.0";
 584                 break;
 585         case SSL3_VERSION:
 586                 str_version = "SSL 3.0 ";
 587                 break;
 588         case TLS1_VERSION:
 589                 str_version = "TLS 1.0 ";
 590                 break;
 591         default:
 592                 str_version = "Unknown TLS version";
 593                 break;
 594         }
 595
 596         if (tls_session->info.version == SSL3_VERSION ||
 597             tls_session->info.version == TLS1_VERSION) {
 598                 switch (tls_session->info.content_type) {
 599                 case SSL3_RT_CHANGE_CIPHER_SPEC:
 600                         str_content_type = "ChangeCipherSpec";
 601                         break;
 602                 case SSL3_RT_ALERT:
 603                         str_content_type = "Alert";
 604                         break;
 605                 case SSL3_RT_HANDSHAKE:
 606                         str_content_type = "Handshake";
 607                         break;
 608                 case SSL3_RT_APPLICATION_DATA:
 609                         str_content_type = "ApplicationData";
 610                         break;
 611                 default:
 612                         str_content_type = "UnknownContentType";
 613                         break;
 614                 }
 615
 616                 if (tls_session->info.content_type == SSL3_RT_ALERT) {
 617                         str_details1 = ", ???";
 618
 619                         if (tls_session->info.record_len == 2) {
 620
 621                                 switch (tls_session->info.alert_level) {
 622                                 case SSL3_AL_WARNING:
 623                                         str_details1 = ", warning";
 624                                         break;
 625                                 case SSL3_AL_FATAL:
 626                                         str_details1 = ", fatal";
 627                                         break;
 628                                 }
 629
 630                                 str_details2 = " ???";
 631                                 switch (tls_session->info.alert_description) {
 632                                 case SSL3_AD_CLOSE_NOTIFY:
 633                                         str_details2 = " close_notify";
 634                                         break;
 635                                 case SSL3_AD_UNEXPECTED_MESSAGE:
 636                                         str_details2 = " unexpected_message";
 637                                         break;
 638                                 case SSL3_AD_BAD_RECORD_MAC:
 639                                         str_details2 = " bad_record_mac";
 640                                         break;
 641                                 case TLS1_AD_DECRYPTION_FAILED:
 642                                         str_details2 = " decryption_failed";
 643                                         break;
 644                                 case TLS1_AD_RECORD_OVERFLOW:
 645                                         str_details2 = " record_overflow";
 646                                         break;
 647                                 case SSL3_AD_DECOMPRESSION_FAILURE:
 648                                         str_details2 = " decompression_failure";
 649                                         break;
 650                                 case SSL3_AD_HANDSHAKE_FAILURE:
 651                                         str_details2 = " handshake_failure";
 652                                         break;
 653                                 case SSL3_AD_BAD_CERTIFICATE:
 654                                         str_details2 = " bad_certificate";
 655                                         break;
 656                                 case SSL3_AD_UNSUPPORTED_CERTIFICATE:
 657                                         str_details2 = " unsupported_certificate";
 658                                         break;
 659                                 case SSL3_AD_CERTIFICATE_REVOKED:
 660                                         str_details2 = " certificate_revoked";
 661                                         break;
 662                                 case SSL3_AD_CERTIFICATE_EXPIRED:
 663                                         str_details2 = " certificate_expired";
 664                                         break;
 665                                 case SSL3_AD_CERTIFICATE_UNKNOWN:
 666                                         str_details2 = " certificate_unknown";
 667                                         break;
 668                                 case SSL3_AD_ILLEGAL_PARAMETER:
 669                                         str_details2 = " illegal_parameter";
 670                                         break;
 671                                 case TLS1_AD_UNKNOWN_CA:
 672                                         str_details2 = " unknown_ca";
 673                                         break;
 674                                 case TLS1_AD_ACCESS_DENIED:
 675                                         str_details2 = " access_denied";
 676                                         break;
 677                                 case TLS1_AD_DECODE_ERROR:
 678                                         str_details2 = " decode_error";
 679                                         break;
 680                                 case TLS1_AD_DECRYPT_ERROR:
 681                                         str_details2 = " decrypt_error";
 682                                         break;
 683                                 case TLS1_AD_EXPORT_RESTRICTION:
 684                                         str_details2 = " export_restriction";
 685                                         break;
 686                                 case TLS1_AD_PROTOCOL_VERSION:
 687                                         str_details2 = " protocol_version";
 688                                         break;
 689                                 case TLS1_AD_INSUFFICIENT_SECURITY:
 690                                         str_details2 = " insufficient_security";
 691                                         break;
 692                                 case TLS1_AD_INTERNAL_ERROR:
 693                                         str_details2 = " internal_error";
 694                                         break;
 695                                 case TLS1_AD_USER_CANCELLED:
 696                                         str_details2 = " user_canceled";
 697                                         break;
 698                                 case TLS1_AD_NO_RENEGOTIATION:
 699                                         str_details2 = " no_renegotiation";
 700                                         break;
 701                                 }
 702                         }
 703                 }
 704
 705                 if (tls_session->info.content_type == SSL3_RT_HANDSHAKE) {
 706                         str_details1 = "???";
 707
 708                         if (tls_session->info.record_len > 0)
 709                         switch (tls_session->info.handshake_type) {
 710                         case SSL3_MT_HELLO_REQUEST:
 711                                 str_details1 = ", HelloRequest";
 712                                 break;
 713                         case SSL3_MT_CLIENT_HELLO:
 714                                 str_details1 = ", ClientHello";
 715                                 break;
 716                         case SSL3_MT_SERVER_HELLO:
 717                                 str_details1 = ", ServerHello";
 718                                 break;
 719                         case SSL3_MT_CERTIFICATE:
 720                                 str_details1 = ", Certificate";
 721                                 break;
 722                         case SSL3_MT_SERVER_KEY_EXCHANGE:
 723                                 str_details1 = ", ServerKeyExchange";
 724                                 break;
 725                         case SSL3_MT_CERTIFICATE_REQUEST:
 726                                 str_details1 = ", CertificateRequest";
 727                                 break;
 728                         case SSL3_MT_SERVER_DONE:
 729                                 str_details1 = ", ServerHelloDone";
 730                                 break;
 731                         case SSL3_MT_CERTIFICATE_VERIFY:
 732                                 str_details1 = ", CertificateVerify";
 733                                 break;
 734                         case SSL3_MT_CLIENT_KEY_EXCHANGE:
 735                                 str_details1 = ", ClientKeyExchange";
 736                                 break;
 737                         case SSL3_MT_FINISHED:
 738                                 str_details1 = ", Finished";
 739                                 break;
 740                         }
 741                 }
 742         }
 743
 744         snprintf(tls_session->info.info_description,
 745                  sizeof(tls_session->info.info_description),
 746                  "%s %s%s [length %04lx]%s%s\n",
 747                  str_write_p, str_version, str_content_type,
 748                  (unsigned long)tls_session->info.record_len,
 749                  str_details1, str_details2);
 750
 751         request = SSL_get_ex_data(tls_session->ssl, FR_TLS_EX_INDEX_REQUEST);
 752
 753         RDEBUG2("%s\n", tls_session->info.info_description);
 754 }
 755
 756 static CONF_PARSER cache_config[] = {
 757         { "enable", PW_TYPE_BOOLEAN,
 758           offsetof(fr_tls_server_conf_t, session_cache_enable), NULL, "no" },
 759         { "lifetime", PW_TYPE_INTEGER,
 760           offsetof(fr_tls_server_conf_t, session_timeout), NULL, "24" },
 761         { "max_entries", PW_TYPE_INTEGER,
 762           offsetof(fr_tls_server_conf_t, session_cache_size), NULL, "255" },
 763         { "name", PW_TYPE_STRING_PTR,
 764           offsetof(fr_tls_server_conf_t, session_id_name), NULL, NULL},
 765         { "persist_dir", PW_TYPE_STRING_PTR,
 766           offsetof(fr_tls_server_conf_t, session_cache_path), NULL, NULL},
 767         { NULL, -1, 0, NULL, NULL }        /* end the list */
 768 };
 769
 770 static CONF_PARSER verify_config[] = {
 771         { "tmpdir", PW_TYPE_STRING_PTR,
 772           offsetof(fr_tls_server_conf_t, verify_tmp_dir), NULL, NULL},
 773         { "client", PW_TYPE_STRING_PTR,
 774           offsetof(fr_tls_server_conf_t, verify_client_cert_cmd), NULL, NULL},
 775         { NULL, -1, 0, NULL, NULL }        /* end the list */
 776 };
 777
 778 #ifdef HAVE_OPENSSL_OCSP_H
 779 static CONF_PARSER ocsp_config[] = {
 780         { "enable", PW_TYPE_BOOLEAN,
 781           offsetof(fr_tls_server_conf_t, ocsp_enable), NULL, "no"},
 782         { "override_cert_url", PW_TYPE_BOOLEAN,
 783           offsetof(fr_tls_server_conf_t, ocsp_override_url), NULL, "no"},
 784         { "url", PW_TYPE_STRING_PTR,
 785           offsetof(fr_tls_server_conf_t, ocsp_url), NULL, NULL },
 786         { "use_nonce", PW_TYPE_BOOLEAN,
 787           offsetof(fr_tls_server_conf_t, ocsp_use_nonce), NULL, "yes"},
 788         { "timeout", PW_TYPE_INTEGER,
 789           offsetof(fr_tls_server_conf_t, ocsp_timeout), NULL, "yes"},
 790         { "softfail", PW_TYPE_BOOLEAN,
 791           offsetof(fr_tls_server_conf_t, ocsp_softfail), NULL, "yes"},
 792         { NULL, -1, 0, NULL, NULL }        /* end the list */
 793 };
 794 #endif
 795
 796 static CONF_PARSER tls_server_config[] = {
 797         { "rsa_key_exchange", PW_TYPE_BOOLEAN,
 798           offsetof(fr_tls_server_conf_t, rsa_key), NULL, "no" },
 799         { "dh_key_exchange", PW_TYPE_BOOLEAN,
 800           offsetof(fr_tls_server_conf_t, dh_key), NULL, "yes" },
 801         { "rsa_key_length", PW_TYPE_INTEGER,
 802           offsetof(fr_tls_server_conf_t, rsa_key_length), NULL, "512" },
 803         { "dh_key_length", PW_TYPE_INTEGER,
 804           offsetof(fr_tls_server_conf_t, dh_key_length), NULL, "512" },
 805         { "verify_depth", PW_TYPE_INTEGER,
 806           offsetof(fr_tls_server_conf_t, verify_depth), NULL, "0" },
 807         { "CA_path", PW_TYPE_FILE_INPUT | PW_TYPE_DEPRECATED,
 808           offsetof(fr_tls_server_conf_t, ca_path), NULL, NULL },
 809         { "ca_path", PW_TYPE_FILE_INPUT,
 810           offsetof(fr_tls_server_conf_t, ca_path), NULL, NULL },
 811         { "pem_file_type", PW_TYPE_BOOLEAN,
 812           offsetof(fr_tls_server_conf_t, file_type), NULL, "yes" },
 813         { "private_key_file", PW_TYPE_FILE_INPUT,
 814           offsetof(fr_tls_server_conf_t, private_key_file), NULL, NULL },
 815         { "certificate_file", PW_TYPE_FILE_INPUT,
 816           offsetof(fr_tls_server_conf_t, certificate_file), NULL, NULL },
 817         { "CA_file", PW_TYPE_FILE_INPUT | PW_TYPE_DEPRECATED,
 818           offsetof(fr_tls_server_conf_t, ca_file), NULL, NULL },
 819         { "ca_file", PW_TYPE_FILE_INPUT,
 820           offsetof(fr_tls_server_conf_t, ca_file), NULL, NULL },
 821         { "private_key_password", PW_TYPE_STRING_PTR | PW_TYPE_SECRET,
 822           offsetof(fr_tls_server_conf_t, private_key_password), NULL, NULL },
 823 #ifdef PSK_MAX_IDENTITY_LEN
 824         { "psk_identity", PW_TYPE_STRING_PTR,
 825           offsetof(fr_tls_server_conf_t, psk_identity), NULL, NULL },
 826         { "psk_hexphrase", PW_TYPE_STRING_PTR | PW_TYPE_SECRET,
 827           offsetof(fr_tls_server_conf_t, psk_password), NULL, NULL },
 828 #endif
 829         { "dh_file", PW_TYPE_STRING_PTR,
 830           offsetof(fr_tls_server_conf_t, dh_file), NULL, NULL },
 831         { "random_file", PW_TYPE_STRING_PTR,
 832           offsetof(fr_tls_server_conf_t, random_file), NULL, NULL },
 833         { "fragment_size", PW_TYPE_INTEGER,
 834           offsetof(fr_tls_server_conf_t, fragment_size), NULL, "1024" },
 835         { "include_length", PW_TYPE_BOOLEAN,
 836           offsetof(fr_tls_server_conf_t, include_length), NULL, "yes" },
 837         { "check_crl", PW_TYPE_BOOLEAN,
 838           offsetof(fr_tls_server_conf_t, check_crl), NULL, "no"},
 839         { "allow_expired_crl", PW_TYPE_BOOLEAN,
 840           offsetof(fr_tls_server_conf_t, allow_expired_crl), NULL, NULL},
 841         { "check_cert_cn", PW_TYPE_STRING_PTR,
 842           offsetof(fr_tls_server_conf_t, check_cert_cn), NULL, NULL},
 843         { "cipher_list", PW_TYPE_STRING_PTR,
 844           offsetof(fr_tls_server_conf_t, cipher_list), NULL, NULL},
 845         { "check_cert_issuer", PW_TYPE_STRING_PTR,
 846           offsetof(fr_tls_server_conf_t, check_cert_issuer), NULL, NULL},
 847         { "require_client_cert", PW_TYPE_BOOLEAN,
 848           offsetof(fr_tls_server_conf_t, require_client_cert), NULL, NULL },
 849
 850 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
 851 #ifndef OPENSSL_NO_ECDH
 852         { "ecdh_curve", PW_TYPE_STRING_PTR,
 853           offsetof(fr_tls_server_conf_t, ecdh_curve), NULL, "prime256v1"},
 854 #endif
 855 #endif
 856
 857         { "cache", PW_TYPE_SUBSECTION, 0, NULL, (void const *) cache_config },
 858
 859         { "verify", PW_TYPE_SUBSECTION, 0, NULL, (void const *) verify_config },
 860
 861 #ifdef HAVE_OPENSSL_OCSP_H
 862         { "ocsp", PW_TYPE_SUBSECTION, 0, NULL, (void const *) ocsp_config },
 863 #endif
 864
 865         { NULL, -1, 0, NULL, NULL }        /* end the list */
 866 };
 867
 868
 869 static CONF_PARSER tls_client_config[] = {
 870         { "rsa_key_exchange", PW_TYPE_BOOLEAN,
 871           offsetof(fr_tls_server_conf_t, rsa_key), NULL, "no" },
 872         { "dh_key_exchange", PW_TYPE_BOOLEAN,
 873           offsetof(fr_tls_server_conf_t, dh_key), NULL, "yes" },
 874         { "rsa_key_length", PW_TYPE_INTEGER,
 875           offsetof(fr_tls_server_conf_t, rsa_key_length), NULL, "512" },
 876         { "dh_key_length", PW_TYPE_INTEGER,
 877           offsetof(fr_tls_server_conf_t, dh_key_length), NULL, "512" },
 878         { "verify_depth", PW_TYPE_INTEGER,
 879           offsetof(fr_tls_server_conf_t, verify_depth), NULL, "0" },
 880         { "ca_path", PW_TYPE_FILE_INPUT,
 881           offsetof(fr_tls_server_conf_t, ca_path), NULL, NULL },
 882         { "pem_file_type", PW_TYPE_BOOLEAN,
 883           offsetof(fr_tls_server_conf_t, file_type), NULL, "yes" },
 884         { "private_key_file", PW_TYPE_FILE_INPUT,
 885           offsetof(fr_tls_server_conf_t, private_key_file), NULL, NULL },
 886         { "certificate_file", PW_TYPE_FILE_INPUT,
 887           offsetof(fr_tls_server_conf_t, certificate_file), NULL, NULL },
 888         { "ca_file", PW_TYPE_FILE_INPUT,
 889           offsetof(fr_tls_server_conf_t, ca_file), NULL, NULL },
 890         { "private_key_password", PW_TYPE_STRING_PTR | PW_TYPE_SECRET,
 891           offsetof(fr_tls_server_conf_t, private_key_password), NULL, NULL },
 892         { "dh_file", PW_TYPE_STRING_PTR,
 893           offsetof(fr_tls_server_conf_t, dh_file), NULL, NULL },
 894         { "random_file", PW_TYPE_STRING_PTR,
 895           offsetof(fr_tls_server_conf_t, random_file), NULL, NULL },
 896         { "fragment_size", PW_TYPE_INTEGER,
 897           offsetof(fr_tls_server_conf_t, fragment_size), NULL, "1024" },
 898         { "include_length", PW_TYPE_BOOLEAN,
 899           offsetof(fr_tls_server_conf_t, include_length), NULL, "yes" },
 900         { "check_crl", PW_TYPE_BOOLEAN,
 901           offsetof(fr_tls_server_conf_t, check_crl), NULL, "no"},
 902         { "check_cert_cn", PW_TYPE_STRING_PTR,
 903           offsetof(fr_tls_server_conf_t, check_cert_cn), NULL, NULL},
 904         { "cipher_list", PW_TYPE_STRING_PTR,
 905           offsetof(fr_tls_server_conf_t, cipher_list), NULL, NULL},
 906         { "check_cert_issuer", PW_TYPE_STRING_PTR,
 907           offsetof(fr_tls_server_conf_t, check_cert_issuer), NULL, NULL},
 908
 909 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
 910 #ifndef OPENSSL_NO_ECDH
 911         { "ecdh_curve", PW_TYPE_STRING_PTR,
 912           offsetof(fr_tls_server_conf_t, ecdh_curve), NULL, "prime256v1"},
 913 #endif
 914 #endif
 915
 916         { NULL, -1, 0, NULL, NULL }        /* end the list */
 917 };
 918
 919
 920 /*
 921  *      TODO: Check for the type of key exchange * like conf->dh_key
 922  */
 923 static int load_dh_params(SSL_CTX *ctx, char *file)
 924 {
 925         DH *dh = NULL;
 926         BIO *bio;
 927
 928         if (!file) return 0;
 929
 930         if ((bio = BIO_new_file(file, "r")) == NULL) {
 931                 ERROR("tls: Unable to open DH file - %s", file);
 932                 return -1;
 933         }
 934
 935         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
 936         BIO_free(bio);
 937         if (!dh) {
 938                 WDEBUG2("tls: Unable to set DH parameters.  DH cipher suites may not work!");
 939                 WDEBUG2("Fix this by running the OpenSSL command listed in eap.conf");
 940                 return 0;
 941         }
 942
 943         if (SSL_CTX_set_tmp_dh(ctx, dh) < 0) {
 944                 ERROR("tls: Unable to set DH parameters");
 945                 DH_free(dh);
 946                 return -1;
 947         }
 948
 949         DH_free(dh);
 950         return 0;
 951 }
 952
 953
 954 /*
 955  *      Generate ephemeral RSA keys.
 956  */
 957 static int generate_eph_rsa_key(SSL_CTX *ctx)
 958 {
 959         RSA *rsa;
 960
 961         rsa = RSA_generate_key(512, RSA_F4, NULL, NULL);
 962
 963         if (!SSL_CTX_set_tmp_rsa(ctx, rsa)) {
 964                 ERROR("tls: Couldn't set ephemeral RSA key");
 965                 return -1;
 966         }
 967
 968         RSA_free(rsa);
 969         return 0;
 970 }
 971
 972 /* index we use to store cached session VPs
 973  * needs to be dynamic so we can supply a "free" function
 974  */
 975 static int FR_TLS_EX_INDEX_VPS = -1;
 976
 977 /*
 978  *      Print debugging messages, and free data.
 979  *
 980  *      FIXME: Write sessions to some long-term storage, so that
 981  *             session resumption can still occur after the server
 982  *             restarts.
 983  */
 984 #define MAX_SESSION_SIZE (256)
 985
 986 static void cbtls_remove_session(SSL_CTX *ctx, SSL_SESSION *sess)
 987 {
 988         size_t size;
 989         char buffer[2 * MAX_SESSION_SIZE + 1];
 990         fr_tls_server_conf_t *conf;
 991
 992         size = sess->session_id_length;
 993         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
 994
 995         fr_bin2hex(buffer, sess->session_id, size);
 996
 997         DEBUG2("  SSL: Removing session %s from the cache", buffer);
 998         conf = (fr_tls_server_conf_t *)SSL_CTX_get_app_data(ctx);
 999         if (conf && conf->session_cache_path) {
1000                 int rv;
1001                 char filename[256];
1002
1003                 /* remove session and any cached VPs */
1004                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
1005                          conf->session_cache_path, FR_DIR_SEP, buffer);
1006                 rv = unlink(filename);
1007                 if (rv != 0) {
1008                         DEBUG2("  SSL: could not remove persisted session file %s: %s", filename, fr_syserror(errno));
1009                 }
1010                 /* VPs might be absent; might not have been written to disk yet */
1011                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
1012                          conf->session_cache_path, FR_DIR_SEP, buffer);
1013                 unlink(filename);
1014         }
1015
1016         return;
1017 }
1018
1019 static int cbtls_new_session(SSL *ssl, SSL_SESSION *sess)
1020 {
1021         size_t size;
1022         char buffer[2 * MAX_SESSION_SIZE + 1];
1023         fr_tls_server_conf_t *conf;
1024         unsigned char *sess_blob = NULL;
1025
1026         size = sess->session_id_length;
1027         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
1028
1029         fr_bin2hex(buffer, sess->session_id, size);
1030
1031         DEBUG2("  SSL: adding session %s to cache", buffer);
1032
1033         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1034         if (conf && conf->session_cache_path) {
1035                 int fd, rv, todo, blob_len;
1036                 char filename[256];
1037                 unsigned char *p;
1038
1039                 /* find out what length data we need */
1040                 blob_len = i2d_SSL_SESSION(sess, NULL);
1041                 if (blob_len < 1) {
1042                         /* something went wrong */
1043                         DEBUG2("  SSL: could not find buffer length to persist session");
1044                         return 0;
1045                 }
1046
1047                 /* alloc and convert to ASN.1 */
1048                 sess_blob = talloc_array(conf, unsigned char, blob_len);
1049                 if (!sess_blob) {
1050                         DEBUG2("  SSL: could not allocate buffer len=%d to persist session", blob_len);
1051                         return 0;
1052                 }
1053                 /* openssl mutates &p */
1054                 p = sess_blob;
1055                 rv = i2d_SSL_SESSION(sess, &p);
1056                 if (rv != blob_len) {
1057                         DEBUG2("  SSL: could not persist session");
1058                         goto error;
1059                 }
1060
1061                 /* open output file */
1062                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
1063                          conf->session_cache_path, FR_DIR_SEP, buffer);
1064                 fd = open(filename, O_RDWR|O_CREAT|O_EXCL, 0600);
1065                 if (fd < 0) {
1066                         DEBUG2("  SSL: could not open session file %s: %s", filename, fr_syserror(errno));
1067                         goto error;
1068                 }
1069
1070                 todo = blob_len;
1071                 p = sess_blob;
1072                 while (todo > 0) {
1073                         rv = write(fd, p, todo);
1074                         if (rv < 1) {
1075                                 DEBUG2("  SSL: failed writing session: %s", fr_syserror(errno));
1076                                 close(fd);
1077                                 goto error;
1078                         }
1079                         p += rv;
1080                         todo -= rv;
1081                 }
1082                 close(fd);
1083                 DEBUG2("  SSL: wrote session %s to %s len=%d", buffer, filename, blob_len);
1084         }
1085
1086 error:
1087         if (sess_blob) talloc_free(sess_blob);
1088
1089         return 0;
1090 }
1091
1092 static SSL_SESSION *cbtls_get_session(SSL *ssl,
1093                                       unsigned char *data, int len,
1094                                       int *copy)
1095 {
1096         size_t size;
1097         char buffer[2 * MAX_SESSION_SIZE + 1];
1098         fr_tls_server_conf_t *conf;
1099
1100         SSL_SESSION *sess = NULL;
1101         unsigned char *sess_data = NULL;
1102         PAIR_LIST *pairlist = NULL;
1103
1104         size = len;
1105         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
1106
1107         fr_bin2hex(buffer, data, size);
1108
1109         DEBUG2("  SSL: Client requested cached session %s", buffer);
1110
1111         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1112         if (conf && conf->session_cache_path) {
1113                 int rv, fd, todo;
1114                 char filename[256];
1115                 unsigned char *p;
1116                 struct stat st;
1117                 VALUE_PAIR *vp;
1118
1119                 /* read in the cached VPs from the .vps file */
1120                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
1121                          conf->session_cache_path, FR_DIR_SEP, buffer);
1122                 rv = pairlist_read(NULL, filename, &pairlist, 1);
1123                 if (rv < 0) {
1124                         /* not safe to un-persist a session w/o VPs */
1125                         DEBUG2("  SSL: could not load persisted VPs for session %s", buffer);
1126                         goto err;
1127                 }
1128
1129                 /* load the actual SSL session */
1130                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
1131                          conf->session_cache_path, FR_DIR_SEP, buffer);
1132                 fd = open(filename, O_RDONLY);
1133                 if (fd < 0) {
1134                         DEBUG2("  SSL: could not find persisted session file %s: %s", filename, fr_syserror(errno));
1135                         goto err;
1136                 }
1137
1138                 rv = fstat(fd, &st);
1139                 if (rv < 0) {
1140                         DEBUG2("  SSL: could not stat persisted session file %s: %s", filename, fr_syserror(errno));
1141                         close(fd);
1142                         goto err;
1143                 }
1144
1145                 sess_data = talloc_array(NULL, unsigned char, st.st_size);
1146                 if (!sess_data) {
1147                   DEBUG2("  SSL: could not alloc buffer for persisted session len=%d", (int) st.st_size);
1148                         close(fd);
1149                         goto err;
1150                 }
1151
1152                 p = sess_data;
1153                 todo = st.st_size;
1154                 while (todo > 0) {
1155                         rv = read(fd, p, todo);
1156                         if (rv < 1) {
1157                                 DEBUG2("  SSL: could not read from persisted session: %s", fr_syserror(errno));
1158                                 close(fd);
1159                                 goto err;
1160                         }
1161                         todo -= rv;
1162                         p += rv;
1163                 }
1164                 close(fd);
1165
1166                 /* openssl mutates &p */
1167                 p = sess_data;
1168                 sess = d2i_SSL_SESSION(NULL, (unsigned char const **)(void **) &p, st.st_size);
1169
1170                 if (!sess) {
1171                         DEBUG2("  SSL: OpenSSL failed to load persisted session: %s", ERR_error_string(ERR_get_error(), NULL));
1172                         goto err;
1173                 }
1174
1175                 /* cache the VPs into the session */
1176                 vp = paircopy(NULL, pairlist->reply);
1177                 SSL_SESSION_set_ex_data(sess, FR_TLS_EX_INDEX_VPS, vp);
1178                 DEBUG2("  SSL: Successfully restored session %s", buffer);
1179         }
1180 err:
1181         if (sess_data) talloc_free(sess_data);
1182         if (pairlist) pairlist_free(&pairlist);
1183
1184         *copy = 0;
1185         return sess;
1186 }
1187
1188 #ifdef HAVE_OPENSSL_OCSP_H
1189 /*
1190  * This function extracts the OCSP Responder URL
1191  * from an existing x509 certificate.
1192  */
1193 static int ocsp_parse_cert_url(X509 *cert, char **phost, char **pport,
1194                                char **ppath, int *pssl)
1195 {
1196         int i;
1197
1198         AUTHORITY_INFO_ACCESS *aia;
1199         ACCESS_DESCRIPTION *ad;
1200
1201         aia = X509_get_ext_d2i(cert, NID_info_access, NULL, NULL);
1202
1203         for (i = 0; i < sk_ACCESS_DESCRIPTION_num(aia); i++) {
1204                 ad = sk_ACCESS_DESCRIPTION_value(aia, 0);
1205                 if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) {
1206                         if (ad->location->type == GEN_URI) {
1207                           if(OCSP_parse_url((char *) ad->location->d.ia5->data,
1208                                                   phost, pport, ppath, pssl))
1209                                         return 1;
1210                         }
1211                 }
1212         }
1213         return 0;
1214 }
1215
1216 /*
1217  * This function sends a OCSP request to a defined OCSP responder
1218  * and checks the OCSP response for correctness.
1219  */
1220
1221 /* Maximum leeway in validity period: default 5 minutes */
1222 #define MAX_VALIDITY_PERIOD     (5 * 60)
1223
1224 static int ocsp_check(X509_STORE *store, X509 *issuer_cert, X509 *client_cert,
1225                       fr_tls_server_conf_t *conf)
1226 {
1227         OCSP_CERTID *certid;
1228         OCSP_REQUEST *req;
1229         OCSP_RESPONSE *resp = NULL;
1230         OCSP_BASICRESP *bresp = NULL;
1231         char *host = NULL;
1232         char *port = NULL;
1233         char *path = NULL;
1234         int use_ssl = -1;
1235         long nsec = MAX_VALIDITY_PERIOD, maxage = -1;
1236         BIO *cbio, *bio_out;
1237         int ocsp_ok = 0;
1238         int status ;
1239         ASN1_GENERALIZEDTIME *rev, *thisupd, *nextupd;
1240         int reason;
1241 #if OPENSSL_VERSION_NUMBER >= 0x1000003f
1242         OCSP_REQ_CTX *ctx;
1243         int rc;
1244         struct timeval now;
1245         struct timeval when;
1246 #endif
1247
1248         /*
1249          * Create OCSP Request
1250          */
1251         certid = OCSP_cert_to_id(NULL, client_cert, issuer_cert);
1252         req = OCSP_REQUEST_new();
1253         OCSP_request_add0_id(req, certid);
1254         if(conf->ocsp_use_nonce) {
1255                 OCSP_request_add1_nonce(req, NULL, 8);
1256         }
1257
1258         /*
1259          * Send OCSP Request and get OCSP Response
1260          */
1261
1262         /* Get OCSP responder URL */
1263         if(conf->ocsp_override_url) {
1264                 OCSP_parse_url(conf->ocsp_url, &host, &port, &path, &use_ssl);
1265         }
1266         else {
1267                 ocsp_parse_cert_url(client_cert, &host, &port, &path, &use_ssl);
1268         }
1269
1270         if (!host || !port || !path) {
1271                 DEBUG2("[ocsp] - Host / port / path missing.  Not doing OCSP.");
1272                 ocsp_ok = 2;
1273                 goto ocsp_skip;
1274         }
1275
1276         DEBUG2("[ocsp] --> Responder URL = http://%s:%s%s", host, port, path);
1277
1278         /* Setup BIO socket to OCSP responder */
1279         cbio = BIO_new_connect(host);
1280
1281         bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
1282
1283         BIO_set_conn_port(cbio, port);
1284 #if OPENSSL_VERSION_NUMBER < 0x1000003f
1285         BIO_do_connect(cbio);
1286
1287         /* Send OCSP request and wait for response */
1288         resp = OCSP_sendreq_bio(cbio, path, req);
1289         if (!resp) {
1290                 ERROR("Couldn't get OCSP response");
1291                 ocsp_ok = 2;
1292                 goto ocsp_end;
1293         }
1294 #else
1295         if (conf->ocsp_timeout)
1296                 BIO_set_nbio(cbio, 1);
1297
1298         rc = BIO_do_connect(cbio);
1299         if ((rc <= 0) && ((!conf->ocsp_timeout) || !BIO_should_retry(cbio))) {
1300                 ERROR("Couldn't connect to OCSP responder");
1301                 ocsp_ok = 2;
1302                 goto ocsp_end;
1303         }
1304
1305         ctx = OCSP_sendreq_new(cbio, path, req, -1);
1306         if (!ctx) {
1307                 ERROR("Couldn't send OCSP request");
1308                 ocsp_ok = 2;
1309                 goto ocsp_end;
1310         }
1311
1312         gettimeofday(&when, NULL);
1313         when.tv_sec += conf->ocsp_timeout;
1314
1315         do {
1316                 rc = OCSP_sendreq_nbio(&resp, ctx);
1317                 if (conf->ocsp_timeout) {
1318                         gettimeofday(&now, NULL);
1319                         if (!timercmp(&now, &when, <))
1320                                 break;
1321                 }
1322         } while ((rc == -1) && BIO_should_retry(cbio));
1323
1324         if (conf->ocsp_timeout && (rc == -1) && BIO_should_retry(cbio)) {
1325                 ERROR("OCSP response timed out");
1326                 ocsp_ok = 2;
1327                 goto ocsp_end;
1328         }
1329
1330         OCSP_REQ_CTX_free(ctx);
1331
1332         if (rc == 0) {
1333                 ERROR("Couldn't get OCSP response");
1334                 ocsp_ok = 2;
1335                 goto ocsp_end;
1336         }
1337 #endif
1338
1339         /* Verify OCSP response status */
1340         status = OCSP_response_status(resp);
1341         DEBUG2("[ocsp] --> Response status: %s",OCSP_response_status_str(status));
1342         if(status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
1343                 ERROR("OCSP response status: %s", OCSP_response_status_str(status));
1344                 goto ocsp_end;
1345         }
1346         bresp = OCSP_response_get1_basic(resp);
1347         if(conf->ocsp_use_nonce && OCSP_check_nonce(req, bresp)!=1) {
1348                 ERROR("OCSP response has wrong nonce value");
1349                 goto ocsp_end;
1350         }
1351         if(OCSP_basic_verify(bresp, NULL, store, 0)!=1){
1352                 ERROR("Couldn't verify OCSP basic response");
1353                 goto ocsp_end;
1354         }
1355
1356         /*      Verify OCSP cert status */
1357         if(!OCSP_resp_find_status(bresp, certid, &status, &reason,
1358                                                       &rev, &thisupd, &nextupd)) {
1359                 ERROR("No Status found.\n");
1360                 goto ocsp_end;
1361         }
1362
1363         if (!OCSP_check_validity(thisupd, nextupd, nsec, maxage)) {
1364                 BIO_puts(bio_out, "WARNING: Status times invalid.\n");
1365                 ERR_print_errors(bio_out);
1366                 goto ocsp_end;
1367         }
1368         BIO_puts(bio_out, "\tThis Update: ");
1369         ASN1_GENERALIZEDTIME_print(bio_out, thisupd);
1370         BIO_puts(bio_out, "\n");
1371         if (nextupd) {
1372                 BIO_puts(bio_out, "\tNext Update: ");
1373                 ASN1_GENERALIZEDTIME_print(bio_out, nextupd);
1374                 BIO_puts(bio_out, "\n");
1375         }
1376
1377         switch (status) {
1378         case V_OCSP_CERTSTATUS_GOOD:
1379                 DEBUG2("[oscp] --> Cert status: good");
1380                 ocsp_ok = 1;
1381                 break;
1382
1383         default:
1384                 /* REVOKED / UNKNOWN */
1385                 DEBUG2("[ocsp] --> Cert status: %s",OCSP_cert_status_str(status));
1386                 if (reason != -1)
1387                         DEBUG2("[ocsp] --> Reason: %s", OCSP_crl_reason_str(reason));
1388                 BIO_puts(bio_out, "\tRevocation Time: ");
1389                 ASN1_GENERALIZEDTIME_print(bio_out, rev);
1390                 BIO_puts(bio_out, "\n");
1391                 break;
1392         }
1393
1394 ocsp_end:
1395         /* Free OCSP Stuff */
1396         OCSP_REQUEST_free(req);
1397         OCSP_RESPONSE_free(resp);
1398         free(host);
1399         free(port);
1400         free(path);
1401         BIO_free_all(cbio);
1402         OCSP_BASICRESP_free(bresp);
1403
1404  ocsp_skip:
1405         switch (ocsp_ok) {
1406         case 1:
1407                 DEBUG2("[ocsp] --> Certificate is valid!");
1408                 break;
1409         case 2:
1410                 if (conf->ocsp_softfail) {
1411                         DEBUG2("[ocsp] --> Unable to check certificate; assuming valid.");
1412                         DEBUG2("[ocsp] --> Warning! This may be insecure.");
1413                         ocsp_ok = 1;
1414                 } else {
1415                         DEBUG2("[ocsp] --> Unable to check certificate; failing!");
1416                         ocsp_ok = 0;
1417                 }
1418                 break;
1419         default:
1420                 DEBUG2("[ocsp] --> Certificate has been expired/revoked!");
1421                 break;
1422         }
1423
1424         return ocsp_ok;
1425 }
1426 #endif  /* HAVE_OPENSSL_OCSP_H */
1427
1428 /*
1429  *      For creating certificate attributes.
1430  */
1431 static char const *cert_attr_names[6][2] = {
1432   { "TLS-Client-Cert-Serial",           "TLS-Cert-Serial" },
1433   { "TLS-Client-Cert-Expiration",       "TLS-Cert-Expiration" },
1434   { "TLS-Client-Cert-Subject",          "TLS-Cert-Subject" },
1435   { "TLS-Client-Cert-Issuer",           "TLS-Cert-Issuer" },
1436   { "TLS-Client-Cert-Common-Name",      "TLS-Cert-Common-Name" },
1437   { "TLS-Client-Cert-Subject-Alt-Name-Email",   "TLS-Cert-Subject-Alt-Name-Email" }
1438 };
1439
1440 #define FR_TLS_SERIAL           (0)
1441 #define FR_TLS_EXPIRATION       (1)
1442 #define FR_TLS_SUBJECT          (2)
1443 #define FR_TLS_ISSUER           (3)
1444 #define FR_TLS_CN               (4)
1445 #define FR_TLS_SAN_EMAIL        (5)
1446
1447 /*
1448  *      Before trusting a certificate, you must make sure that the
1449  *      certificate is 'valid'. There are several steps that your
1450  *      application can take in determining if a certificate is
1451  *      valid. Commonly used steps are:
1452  *
1453  *      1.Verifying the certificate's signature, and verifying that
1454  *      the certificate has been issued by a trusted Certificate
1455  *      Authority.
1456  *
1457  *      2.Verifying that the certificate is valid for the present date
1458  *      (i.e. it is being presented within its validity dates).
1459  *
1460  *      3.Verifying that the certificate has not been revoked by its
1461  *      issuing Certificate Authority, by checking with respect to a
1462  *      Certificate Revocation List (CRL).
1463  *
1464  *      4.Verifying that the credentials presented by the certificate
1465  *      fulfill additional requirements specific to the application,
1466  *      such as with respect to access control lists or with respect
1467  *      to OCSP (Online Certificate Status Processing).
1468  *
1469  *      NOTE: This callback will be called multiple times based on the
1470  *      depth of the root certificate chain
1471  */
1472 int cbtls_verify(int ok, X509_STORE_CTX *ctx)
1473 {
1474         char subject[1024]; /* Used for the subject name */
1475         char issuer[1024]; /* Used for the issuer name */
1476         char attribute[1024];
1477         char value[1024];
1478         char common_name[1024];
1479         char cn_str[1024];
1480         char buf[64];
1481         X509 *client_cert;
1482         X509_CINF *client_inf;
1483         STACK_OF(X509_EXTENSION) *ext_list;
1484         SSL *ssl;
1485         int err, depth, lookup, loc;
1486         fr_tls_server_conf_t *conf;
1487         int my_ok = ok;
1488         REQUEST *request;
1489         ASN1_INTEGER *sn = NULL;
1490         ASN1_TIME *asn_time = NULL;
1491         VALUE_PAIR **certs;
1492         char **identity;
1493 #ifdef HAVE_OPENSSL_OCSP_H
1494         X509_STORE *ocsp_store = NULL;
1495         X509 *issuer_cert;
1496 #endif
1497
1498         client_cert = X509_STORE_CTX_get_current_cert(ctx);
1499         err = X509_STORE_CTX_get_error(ctx);
1500         depth = X509_STORE_CTX_get_error_depth(ctx);
1501
1502         lookup = depth;
1503
1504         /*
1505          *      Log client/issuing cert.  If there's an error, log
1506          *      issuing cert.
1507          */
1508         if ((lookup > 1) && !my_ok) lookup = 1;
1509
1510         /*
1511          * Retrieve the pointer to the SSL of the connection currently treated
1512          * and the application specific data stored into the SSL object.
1513          */
1514         ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
1515         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1516         if (!conf) return 1;
1517
1518         request = (REQUEST *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
1519
1520         if (!request) return 1; /* FIXME: outbound TLS */
1521
1522         rad_assert(request != NULL);
1523         certs = (VALUE_PAIR **)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CERTS);
1524         rad_assert(certs != NULL);
1525         identity = (char **)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_IDENTITY);
1526 #ifdef HAVE_OPENSSL_OCSP_H
1527         ocsp_store = (X509_STORE *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_STORE);
1528 #endif
1529
1530         /*
1531          *      Get the Serial Number
1532          */
1533         buf[0] = '\0';
1534         sn = X509_get_serialNumber(client_cert);
1535
1536         /*
1537          *      For this next bit, we create the attributes *only* if
1538          *      we're at the client or issuing certificate, AND we
1539          *      have a user identity.  i.e. we don't create the
1540          *      attributes for RadSec connections.
1541          */
1542         if (identity &&
1543             (lookup <= 1) && sn && ((size_t) sn->length < (sizeof(buf) / 2))) {
1544                 char *p = buf;
1545                 int i;
1546
1547                 for (i = 0; i < sn->length; i++) {
1548                         sprintf(p, "%02x", (unsigned int)sn->data[i]);
1549                         p += 2;
1550                 }
1551                 pairmake(NULL, certs, cert_attr_names[FR_TLS_SERIAL][lookup], buf, T_OP_SET);
1552         }
1553
1554
1555         /*
1556          *      Get the Expiration Date
1557          */
1558         buf[0] = '\0';
1559         asn_time = X509_get_notAfter(client_cert);
1560         if (identity && (lookup <= 1) && asn_time &&
1561             (asn_time->length < (int) sizeof(buf))) {
1562                 memcpy(buf, (char*) asn_time->data, asn_time->length);
1563                 buf[asn_time->length] = '\0';
1564                 pairmake(NULL, certs, cert_attr_names[FR_TLS_EXPIRATION][lookup], buf, T_OP_SET);
1565         }
1566
1567         /*
1568          *      Get the Subject & Issuer
1569          */
1570         subject[0] = issuer[0] = '\0';
1571         X509_NAME_oneline(X509_get_subject_name(client_cert), subject,
1572                           sizeof(subject));
1573         subject[sizeof(subject) - 1] = '\0';
1574         if (identity && (lookup <= 1) && subject[0]) {
1575                 pairmake(NULL, certs, cert_attr_names[FR_TLS_SUBJECT][lookup], subject, T_OP_SET);
1576         }
1577
1578         X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), issuer,
1579                           sizeof(issuer));
1580         issuer[sizeof(issuer) - 1] = '\0';
1581         if (identity && (lookup <= 1) && issuer[0]) {
1582                 pairmake(NULL, certs, cert_attr_names[FR_TLS_ISSUER][lookup], issuer, T_OP_SET);
1583         }
1584
1585         /*
1586          *      Get the Common Name, if there is a subject.
1587          */
1588         X509_NAME_get_text_by_NID(X509_get_subject_name(client_cert),
1589                                   NID_commonName, common_name, sizeof(common_name));
1590         common_name[sizeof(common_name) - 1] = '\0';
1591         if (identity && (lookup <= 1) && common_name[0] && subject[0]) {
1592                 pairmake(NULL, certs, cert_attr_names[FR_TLS_CN][lookup], common_name, T_OP_SET);
1593         }
1594
1595 #ifdef GEN_EMAIL
1596         /*
1597          *      Get the RFC822 Subject Alternative Name
1598          */
1599         loc = X509_get_ext_by_NID(client_cert, NID_subject_alt_name, 0);
1600         if (lookup <= 1 && loc >= 0) {
1601                 X509_EXTENSION *ext = NULL;
1602                 GENERAL_NAMES *names = NULL;
1603                 int i;
1604
1605                 if ((ext = X509_get_ext(client_cert, loc)) &&
1606                     (names = X509V3_EXT_d2i(ext))) {
1607                         for (i = 0; i < sk_GENERAL_NAME_num(names); i++) {
1608                                 GENERAL_NAME *name = sk_GENERAL_NAME_value(names, i);
1609
1610                                 switch (name->type) {
1611                                 case GEN_EMAIL:
1612                                         pairmake(NULL, certs, cert_attr_names[FR_TLS_SAN_EMAIL][lookup],
1613                                                  (char *) ASN1_STRING_data(name->d.rfc822Name), T_OP_SET);
1614                                         break;
1615                                 default:
1616                                         /* XXX TODO handle other SAN types */
1617                                         break;
1618                                 }
1619                         }
1620                 }
1621                 if (names != NULL)
1622                         sk_GENERAL_NAME_free(names);
1623         }
1624 #endif  /* GEN_EMAIL */
1625
1626         /*
1627          *      If the CRL has expired, that might still be OK.
1628          */
1629         if (!my_ok &&
1630             (conf->allow_expired_crl) &&
1631             (err == X509_V_ERR_CRL_HAS_EXPIRED)) {
1632                 my_ok = 1;
1633                 X509_STORE_CTX_set_error( ctx, 0 );
1634         }
1635
1636         if (!my_ok) {
1637                 char const *p = X509_verify_cert_error_string(err);
1638                 ERROR("--> verify error:num=%d:%s\n",err, p);
1639                 REDEBUG("SSL says error %d : %s", err, p);
1640                 return my_ok;
1641         }
1642
1643         if (lookup == 0) {
1644                 client_inf = client_cert->cert_info;
1645                 ext_list = client_inf->extensions;
1646         } else {
1647                 ext_list = NULL;
1648         }
1649
1650         /*
1651          *      Grab the X509 extensions, and create attributes out of them.
1652          *      For laziness, we re-use the OpenSSL names
1653          */
1654         if (sk_X509_EXTENSION_num(ext_list) > 0) {
1655                 int i, len;
1656                 char *p;
1657                 BIO *out;
1658
1659                 out = BIO_new(BIO_s_mem());
1660                 strlcpy(attribute, "TLS-Client-Cert-", sizeof(attribute));
1661
1662                 for (i = 0; i < sk_X509_EXTENSION_num(ext_list); i++) {
1663                         ASN1_OBJECT *obj;
1664                         X509_EXTENSION *ext;
1665                         VALUE_PAIR *vp;
1666
1667                         ext = sk_X509_EXTENSION_value(ext_list, i);
1668
1669                         obj = X509_EXTENSION_get_object(ext);
1670                         i2a_ASN1_OBJECT(out, obj);
1671                         len = BIO_read(out, attribute + 16 , sizeof(attribute) - 16 - 1);
1672                         if (len <= 0) continue;
1673
1674                         attribute[16 + len] = '\0';
1675
1676                         X509V3_EXT_print(out, ext, 0, 0);
1677                         len = BIO_read(out, value , sizeof(value) - 1);
1678                         if (len <= 0) continue;
1679
1680                         value[len] = '\0';
1681
1682                         /*
1683                          *      Mash the OpenSSL name to our name, and
1684                          *      create the attribute.
1685                          */
1686                         for (p = value + 16; *p != '\0'; p++) {
1687                                 if (*p == ' ') *p = '-';
1688                         }
1689
1690                         vp = pairmake(NULL, certs, attribute, value, T_OP_ADD);
1691                         if (vp) debug_pair_list(vp);
1692                 }
1693
1694                 BIO_free_all(out);
1695         }
1696
1697         switch (ctx->error) {
1698
1699         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
1700                 ERROR("issuer= %s\n", issuer);
1701                 break;
1702         case X509_V_ERR_CERT_NOT_YET_VALID:
1703         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
1704                 ERROR("notBefore=");
1705 #if 0
1706                 ASN1_TIME_print(bio_err, X509_get_notBefore(ctx->current_cert));
1707 #endif
1708                 break;
1709         case X509_V_ERR_CERT_HAS_EXPIRED:
1710         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
1711                 ERROR("notAfter=");
1712 #if 0
1713                 ASN1_TIME_print(bio_err, X509_get_notAfter(ctx->current_cert));
1714 #endif
1715                 break;
1716         }
1717
1718         /*
1719          *      If we're at the actual client cert, apply additional
1720          *      checks.
1721          */
1722         if (depth == 0) {
1723                 /*
1724                  *      If the conf tells us to, check cert issuer
1725                  *      against the specified value and fail
1726                  *      verification if they don't match.
1727                  */
1728                 if (conf->check_cert_issuer &&
1729                     (strcmp(issuer, conf->check_cert_issuer) != 0)) {
1730                         AUTH("tls: Certificate issuer (%s) does not match specified value (%s)!", issuer, conf->check_cert_issuer);
1731                         my_ok = 0;
1732                 }
1733
1734                 /*
1735                  *      If the conf tells us to, check the CN in the
1736                  *      cert against xlat'ed value, but only if the
1737                  *      previous checks passed.
1738                  */
1739                 if (my_ok && conf->check_cert_cn) {
1740                         if (radius_xlat(cn_str, sizeof(cn_str), request, conf->check_cert_cn, NULL, NULL) < 0) {
1741                                 /* if this fails, fail the verification */
1742                                 my_ok = 0;
1743                         } else {
1744                                 RDEBUG2("checking certificate CN (%s) with xlat'ed value (%s)", common_name, cn_str);
1745                                 if (strcmp(cn_str, common_name) != 0) {
1746                                         AUTH("tls: Certificate CN (%s) does not match specified value (%s)!", common_name, cn_str);
1747                                         my_ok = 0;
1748                                 }
1749                         }
1750                 } /* check_cert_cn */
1751
1752 #ifdef HAVE_OPENSSL_OCSP_H
1753                 if (my_ok && conf->ocsp_enable){
1754                         RDEBUG2("--> Starting OCSP Request");
1755                         if(X509_STORE_CTX_get1_issuer(&issuer_cert, ctx, client_cert)!=1) {
1756                                 ERROR("Couldn't get issuer_cert for %s", common_name);
1757                         }
1758                         my_ok = ocsp_check(ocsp_store, issuer_cert, client_cert, conf);
1759                 }
1760 #endif
1761
1762                 while (conf->verify_client_cert_cmd) {
1763                         char filename[256];
1764                         int fd;
1765                         FILE *fp;
1766
1767                         snprintf(filename, sizeof(filename), "%s/%s.client.XXXXXXXX",
1768                                  conf->verify_tmp_dir, progname);
1769                         fd = mkstemp(filename);
1770                         if (fd < 0) {
1771                                 RDEBUG("Failed creating file in %s: %s",
1772                                        conf->verify_tmp_dir, fr_syserror(errno));
1773                                 break;
1774                         }
1775
1776                         fp = fdopen(fd, "w");
1777                         if (!fp) {
1778                                 RDEBUG("Failed opening file %s: %s",
1779                                        filename, fr_syserror(errno));
1780                                 break;
1781                         }
1782
1783                         if (!PEM_write_X509(fp, client_cert)) {
1784                                 fclose(fp);
1785                                 RDEBUG("Failed writing certificate to file");
1786                                 goto do_unlink;
1787                         }
1788                         fclose(fp);
1789
1790                         if (!pairmake_packet("TLS-Client-Cert-Filename",
1791                                              filename, T_OP_SET)) {
1792                                 RDEBUG("Failed creating TLS-Client-Cert-Filename");
1793
1794                                 goto do_unlink;
1795                         }
1796
1797                         RDEBUG("Verifying client certificate: %s", conf->verify_client_cert_cmd);
1798                         if (radius_exec_program(request, conf->verify_client_cert_cmd, true, true, NULL, 0,
1799                                                 EXEC_TIMEOUT, request->packet->vps, NULL) != 0) {
1800                                 AUTH("tls: Certificate CN (%s) fails external verification!", common_name);
1801                                 my_ok = 0;
1802                         } else {
1803                                 RDEBUG("Client certificate CN %s passed external validation", common_name);
1804                         }
1805
1806                 do_unlink:
1807                         unlink(filename);
1808                         break;
1809                 }
1810
1811
1812         } /* depth == 0 */
1813
1814         if (debug_flag > 0) {
1815                 RDEBUG2("chain-depth=%d, ", depth);
1816                 RDEBUG2("error=%d", err);
1817
1818                 if (identity) RDEBUG2("--> User-Name = %s", *identity);
1819                 RDEBUG2("--> BUF-Name = %s", common_name);
1820                 RDEBUG2("--> subject = %s", subject);
1821                 RDEBUG2("--> issuer  = %s", issuer);
1822                 RDEBUG2("--> verify return:%d", my_ok);
1823         }
1824         return my_ok;
1825 }
1826
1827
1828 #ifdef HAVE_OPENSSL_OCSP_H
1829 /*
1830  *      Create Global X509 revocation store and use it to verify
1831  *      OCSP responses
1832  *
1833  *      - Load the trusted CAs
1834  *      - Load the trusted issuer certificates
1835  */
1836 static X509_STORE *init_revocation_store(fr_tls_server_conf_t *conf)
1837 {
1838         X509_STORE *store = NULL;
1839
1840         store = X509_STORE_new();
1841
1842         /* Load the CAs we trust */
1843         if (conf->ca_file || conf->ca_path)
1844                 if(!X509_STORE_load_locations(store, conf->ca_file, conf->ca_path)) {
1845                         ERROR("tls: X509_STORE error %s", ERR_error_string(ERR_get_error(), NULL));
1846                         ERROR("tls: Error reading Trusted root CA list %s",conf->ca_file );
1847                         return NULL;
1848                 }
1849
1850 #ifdef X509_V_FLAG_CRL_CHECK
1851         if (conf->check_crl)
1852                 X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK);
1853 #endif
1854         return store;
1855 }
1856 #endif  /* HAVE_OPENSSL_OCSP_H */
1857
1858 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
1859 #ifndef OPENSSL_NO_ECDH
1860 static int set_ecdh_curve(SSL_CTX *ctx, char const *ecdh_curve)
1861 {
1862         int      nid;
1863         EC_KEY  *ecdh;
1864
1865         if (!ecdh_curve || !*ecdh_curve) return 0;
1866
1867         nid = OBJ_sn2nid(ecdh_curve);
1868         if (!nid) {
1869                 ERROR("Unknown ecdh_curve \"%s\"", ecdh_curve);
1870                 return -1;
1871         }
1872
1873         ecdh = EC_KEY_new_by_curve_name(nid);
1874         if (!ecdh) {
1875                 ERROR("Unable to create new curve \"%s\"", ecdh_curve);
1876                 return -1;
1877         }
1878
1879         SSL_CTX_set_tmp_ecdh(ctx, ecdh);
1880
1881         SSL_CTX_set_options(ctx, SSL_OP_SINGLE_ECDH_USE);
1882
1883         EC_KEY_free(ecdh);
1884
1885         return 0;
1886 }
1887 #endif
1888 #endif
1889
1890 /*
1891  * DIE OPENSSL DIE DIE DIE
1892  *
1893  * What a palaver, just to free some data attached the
1894  * session. We need to do this because the "remove" callback
1895  * is called when refcount > 0 sometimes, if another thread
1896  * is using the session
1897  */
1898 static void sess_free_vps(UNUSED void *parent, void *data_ptr,
1899                                 UNUSED CRYPTO_EX_DATA *ad, UNUSED int idx,
1900                                 UNUSED long argl, UNUSED void *argp)
1901 {
1902         VALUE_PAIR *vp = data_ptr;
1903         if (!vp) return;
1904
1905         DEBUG2("  Freeing cached session VPs %p", vp);
1906
1907         pairfree(&vp);
1908 }
1909
1910 /*
1911  *      Add all the default ciphers and message digests
1912  *      Create our context.
1913  *
1914  *      This should be called exactly once from main.
1915  */
1916 int tls_global_init(void)
1917 {
1918         long v;
1919
1920         SSL_load_error_strings();       /* readable error messages (examples show call before library_init) */
1921         SSL_library_init();             /* initialize library */
1922 #ifdef HAVE_OPENSSL_EVP_H
1923         OpenSSL_add_all_algorithms();   /* required for SHA2 in OpenSSL < 0.9.8o and 1.0.0.a */
1924 #endif
1925
1926         /* Check for bad versions */
1927         v = SSLeay();
1928
1929         /* 1.0.1 - 1.0.1f CVE-2014-0160 http://heartbleed.com */
1930         if ((v >= 0x010001000) && (v < 0x010001070)) {
1931                 ERROR("Refusing to start with libssl version %s (in range 1.0.1 - 1.0.1f).  "
1932                       "Security advisory CVE-2014-0160 (Heartbleed)", ssl_version());
1933                 ERROR("For more information see http://heartbleed.com");
1934
1935                 return -1;
1936         }
1937
1938         return 0;
1939 }
1940
1941 /*
1942  *      Create Global context SSL and use it in every new session
1943  *
1944  *      - Load the trusted CAs
1945  *      - Load the Private key & the certificate
1946  *      - Set the Context options & Verify options
1947  */
1948 static SSL_CTX *init_tls_ctx(fr_tls_server_conf_t *conf, int client)
1949 {
1950         SSL_CTX *ctx;
1951         X509_STORE *certstore;
1952         int verify_mode = SSL_VERIFY_NONE;
1953         int ctx_options = 0;
1954         int type;
1955
1956         /*
1957          *      SHA256 is in all versions of OpenSSL, but isn't
1958          *      initialized by default.  It's needed for WiMAX
1959          *      certificates.
1960          */
1961 #ifdef HAVE_OPENSSL_EVP_SHA256
1962         EVP_add_digest(EVP_sha256());
1963 #endif
1964
1965         ctx = SSL_CTX_new(TLSv1_method());
1966
1967         /*
1968          * Save the config on the context so that callbacks which
1969          * only get SSL_CTX* e.g. session persistence, can get it
1970          */
1971         SSL_CTX_set_app_data(ctx, conf);
1972
1973         /*
1974          * Identify the type of certificates that needs to be loaded
1975          */
1976         if (conf->file_type) {
1977                 type = SSL_FILETYPE_PEM;
1978         } else {
1979                 type = SSL_FILETYPE_ASN1;
1980         }
1981
1982         /*
1983          * Set the password to load private key
1984          */
1985         if (conf->private_key_password) {
1986 #ifdef __APPLE__
1987                 /*
1988                  * We don't want to put the private key password in eap.conf, so  check
1989                  * for our special string which indicates we should get the password
1990                  * programmatically.
1991                  */
1992                 char const* special_string = "Apple:UseCertAdmin";
1993                 if (strncmp(conf->private_key_password,
1994                                         special_string,
1995                                         strlen(special_string)) == 0)
1996                 {
1997                         char cmd[256];
1998                         long const max_password_len = 128;
1999                         snprintf(cmd, sizeof(cmd) - 1,
2000                                          "/usr/sbin/certadmin --get-private-key-passphrase \"%s\"",
2001                                          conf->private_key_file);
2002
2003                         DEBUG2("tls: Getting private key passphrase using command \"%s\"", cmd);
2004
2005                         FILE* cmd_pipe = popen(cmd, "r");
2006                         if (!cmd_pipe) {
2007                                 ERROR("TLS: %s command failed.  Unable to get private_key_password", cmd);
2008                                 ERROR("Error reading private_key_file %s", conf->private_key_file);
2009                                 return NULL;
2010                         }
2011
2012                         talloc_free(conf->private_key_password);
2013                         conf->private_key_password = talloc_array(conf, char, max_password_len);
2014                         if (!conf->private_key_password) {
2015                                 ERROR("TLS: Can't allocate space for private_key_password");
2016                                 ERROR("TLS: Error reading private_key_file %s", conf->private_key_file);
2017                                 pclose(cmd_pipe);
2018                                 return NULL;
2019                         }
2020
2021                         fgets(conf->private_key_password, max_password_len, cmd_pipe);
2022                         pclose(cmd_pipe);
2023
2024                         /* Get rid of newline at end of password. */
2025                         conf->private_key_password[strlen(conf->private_key_password) - 1] = '\0';
2026
2027                         DEBUG3("tls:  Password from command = \"%s\"", conf->private_key_password);
2028                 }
2029 #endif
2030                 SSL_CTX_set_default_passwd_cb_userdata(ctx, conf->private_key_password);
2031                 SSL_CTX_set_default_passwd_cb(ctx, cbtls_password);
2032         }
2033
2034 #ifdef PSK_MAX_IDENTITY_LEN
2035         if ((conf->psk_identity && !conf->psk_password) ||
2036             (!conf->psk_identity && conf->psk_password) ||
2037             (conf->psk_identity && !*conf->psk_identity) ||
2038             (conf->psk_password && !*conf->psk_password)) {
2039                 ERROR("Invalid PSK Configuration: psk_identity or psk_password are empty");
2040                 return NULL;
2041         }
2042
2043         if (conf->psk_identity) {
2044                 size_t psk_len, hex_len;
2045                 char buffer[PSK_MAX_PSK_LEN];
2046
2047                 if (conf->certificate_file ||
2048                     conf->private_key_password || conf->private_key_file ||
2049                     conf->ca_file || conf->ca_path) {
2050                         ERROR("When PSKs are used, No certificate configuration is permitted");
2051                         return NULL;
2052                 }
2053
2054                 if (client) {
2055                         SSL_CTX_set_psk_client_callback(ctx,
2056                                                         psk_client_callback);
2057                 } else {
2058                         SSL_CTX_set_psk_server_callback(ctx,
2059                                                         psk_server_callback);
2060                 }
2061
2062                 psk_len = strlen(conf->psk_password);
2063                 if (strlen(conf->psk_password) > (2 * PSK_MAX_PSK_LEN)) {
2064                         ERROR("psk_hexphrase is too long (max %d)",
2065                                PSK_MAX_PSK_LEN);
2066                         return NULL;
2067                 }
2068
2069                 hex_len = fr_hex2bin((uint8_t *) buffer, conf->psk_password, psk_len);
2070                 if (psk_len != (2 * hex_len)) {
2071                         ERROR("psk_hexphrase is not all hex");
2072                         return NULL;
2073                 }
2074
2075                 goto post_ca;
2076         }
2077 #else
2078         (void) client;  /* -Wunused */
2079 #endif
2080
2081         /*
2082          *      Load our keys and certificates
2083          *
2084          *      If certificates are of type PEM then we can make use
2085          *      of cert chain authentication using openssl api call
2086          *      SSL_CTX_use_certificate_chain_file.  Please see how
2087          *      the cert chain needs to be given in PEM from
2088          *      openSSL.org
2089          */
2090         if (!conf->certificate_file) goto load_ca;
2091
2092         if (type == SSL_FILETYPE_PEM) {
2093                 if (!(SSL_CTX_use_certificate_chain_file(ctx, conf->certificate_file))) {
2094                         ERROR("Error reading certificate file %s:%s",
2095                                conf->certificate_file,
2096                                ERR_error_string(ERR_get_error(), NULL));
2097                         return NULL;
2098                 }
2099
2100         } else if (!(SSL_CTX_use_certificate_file(ctx, conf->certificate_file, type))) {
2101                 ERROR("Error reading certificate file %s:%s",
2102                        conf->certificate_file,
2103                        ERR_error_string(ERR_get_error(), NULL));
2104                 return NULL;
2105         }
2106
2107         /* Load the CAs we trust */
2108 load_ca:
2109         if (conf->ca_file || conf->ca_path) {
2110                 if (!SSL_CTX_load_verify_locations(ctx, conf->ca_file, conf->ca_path)) {
2111                         ERROR("tls: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
2112                         ERROR("tls: Error reading Trusted root CA list %s",conf->ca_file );
2113                         return NULL;
2114                 }
2115         }
2116         if (conf->ca_file && *conf->ca_file) SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(conf->ca_file));
2117
2118         if (conf->private_key_file) {
2119                 if (!(SSL_CTX_use_PrivateKey_file(ctx, conf->private_key_file, type))) {
2120                         ERROR("Failed reading private key file %s:%s",
2121                                conf->private_key_file,
2122                                ERR_error_string(ERR_get_error(), NULL));
2123                         return NULL;
2124                 }
2125
2126                 /*
2127                  * Check if the loaded private key is the right one
2128                  */
2129                 if (!SSL_CTX_check_private_key(ctx)) {
2130                         ERROR("Private key does not match the certificate public key");
2131                         return NULL;
2132                 }
2133         }
2134
2135 #ifdef PSK_MAX_IDENTITY_LEN
2136 post_ca:
2137 #endif
2138
2139         /*
2140          *      Set ctx_options
2141          */
2142         ctx_options |= SSL_OP_NO_SSLv2;
2143         ctx_options |= SSL_OP_NO_SSLv3;
2144 #ifdef SSL_OP_NO_TICKET
2145         ctx_options |= SSL_OP_NO_TICKET ;
2146 #endif
2147
2148         /*
2149          *      SSL_OP_SINGLE_DH_USE must be used in order to prevent
2150          *      small subgroup attacks and forward secrecy. Always
2151          *      using
2152          *
2153          *      SSL_OP_SINGLE_DH_USE has an impact on the computer
2154          *      time needed during negotiation, but it is not very
2155          *      large.
2156          */
2157         ctx_options |= SSL_OP_SINGLE_DH_USE;
2158
2159         /*
2160          *      SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS to work around issues
2161          *      in Windows Vista client.
2162          *      http://www.openssl.org/~bodo/tls-cbc.txt
2163          *      http://www.nabble.com/(RADIATOR)-Radiator-Version-3.16-released-t2600070.html
2164          */
2165         ctx_options |= SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
2166
2167         SSL_CTX_set_options(ctx, ctx_options);
2168
2169         /*
2170          *      TODO: Set the RSA & DH
2171          *      SSL_CTX_set_tmp_rsa_callback(ctx, cbtls_rsa);
2172          *      SSL_CTX_set_tmp_dh_callback(ctx, cbtls_dh);
2173          */
2174
2175         /*
2176          *      set the message callback to identify the type of
2177          *      message.  For every new session, there can be a
2178          *      different callback argument.
2179          *
2180          *      SSL_CTX_set_msg_callback(ctx, cbtls_msg);
2181          */
2182
2183         /*
2184          *      Set eliptical curve crypto configuration.
2185          */
2186 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
2187 #ifndef OPENSSL_NO_ECDH
2188         if (set_ecdh_curve(ctx, conf->ecdh_curve) < 0) {
2189                 return NULL;
2190         }
2191 #endif
2192 #endif
2193
2194         /* Set Info callback */
2195         SSL_CTX_set_info_callback(ctx, cbtls_info);
2196
2197         /*
2198          *      Callbacks, etc. for session resumption.
2199          */
2200         if (conf->session_cache_enable) {
2201                 SSL_CTX_sess_set_new_cb(ctx, cbtls_new_session);
2202                 SSL_CTX_sess_set_get_cb(ctx, cbtls_get_session);
2203                 SSL_CTX_sess_set_remove_cb(ctx, cbtls_remove_session);
2204
2205                 SSL_CTX_set_quiet_shutdown(ctx, 1);
2206                 if (FR_TLS_EX_INDEX_VPS < 0)
2207                         FR_TLS_EX_INDEX_VPS = SSL_SESSION_get_ex_new_index(0, NULL, NULL, NULL, sess_free_vps);
2208         }
2209
2210         /*
2211          *      Check the certificates for revocation.
2212          */
2213 #ifdef X509_V_FLAG_CRL_CHECK
2214         if (conf->check_crl) {
2215           certstore = SSL_CTX_get_cert_store(ctx);
2216           if (certstore == NULL) {
2217             ERROR("tls: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
2218             ERROR("tls: Error reading Certificate Store");
2219             return NULL;
2220           }
2221           X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK);
2222         }
2223 #endif
2224
2225         /*
2226          *      Set verify modes
2227          *      Always verify the peer certificate
2228          */
2229         verify_mode |= SSL_VERIFY_PEER;
2230         verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
2231         verify_mode |= SSL_VERIFY_CLIENT_ONCE;
2232         SSL_CTX_set_verify(ctx, verify_mode, cbtls_verify);
2233
2234         if (conf->verify_depth) {
2235                 SSL_CTX_set_verify_depth(ctx, conf->verify_depth);
2236         }
2237
2238         /* Load randomness */
2239         if (conf->random_file) {
2240                 if (!(RAND_load_file(conf->random_file, 1024*10))) {
2241                         ERROR("tls: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
2242                         ERROR("tls: Error loading randomness");
2243                         return NULL;
2244                 }
2245         }
2246
2247         /*
2248          * Set the cipher list if we were told to
2249          */
2250         if (conf->cipher_list) {
2251                 if (!SSL_CTX_set_cipher_list(ctx, conf->cipher_list)) {
2252                         ERROR("tls: Error setting cipher list");
2253                         return NULL;
2254                 }
2255         }
2256
2257         /*
2258          *      Setup session caching
2259          */
2260         if (conf->session_cache_enable) {
2261                 /*
2262                  *      Create a unique context Id per EAP-TLS configuration.
2263                  */
2264                 if (conf->session_id_name) {
2265                         snprintf(conf->session_context_id,
2266                                  sizeof(conf->session_context_id),
2267                                  "FR eap %s",
2268                                  conf->session_id_name);
2269                 } else {
2270                         snprintf(conf->session_context_id,
2271                                  sizeof(conf->session_context_id),
2272                                  "FR eap %p", conf);
2273                 }
2274
2275                 /*
2276                  *      Cache it, and DON'T auto-clear it.
2277                  */
2278                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_SERVER | SSL_SESS_CACHE_NO_AUTO_CLEAR);
2279
2280                 SSL_CTX_set_session_id_context(ctx,
2281                                                (unsigned char *) conf->session_context_id,
2282                                                (unsigned int) strlen(conf->session_context_id));
2283
2284                 /*
2285                  *      Our timeout is in hours, this is in seconds.
2286                  */
2287                 SSL_CTX_set_timeout(ctx, conf->session_timeout * 3600);
2288
2289                 /*
2290                  *      Set the maximum number of entries in the
2291                  *      session cache.
2292                  */
2293                 SSL_CTX_sess_set_cache_size(ctx, conf->session_cache_size);
2294
2295         } else {
2296                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
2297         }
2298
2299         return ctx;
2300 }
2301
2302
2303 /*
2304  *      Free TLS client/server config
2305  *      Should not be called outside this code, as a callback is
2306  *      added to automatically free the data when the CONF_SECTION
2307  *      is freed.
2308  */
2309 static int tls_server_conf_free(fr_tls_server_conf_t *conf)
2310 {
2311         if (conf->ctx) SSL_CTX_free(conf->ctx);
2312
2313 #ifdef HAVE_OPENSSL_OCSP_H
2314         if (conf->ocsp_store) X509_STORE_free(conf->ocsp_store);
2315         conf->ocsp_store = NULL;
2316 #endif
2317
2318 #ifndef NDEBUG
2319         memset(conf, 0, sizeof(*conf));
2320 #endif
2321         return 0;
2322 }
2323
2324
2325 fr_tls_server_conf_t *tls_server_conf_parse(CONF_SECTION *cs)
2326 {
2327         fr_tls_server_conf_t *conf;
2328
2329         /*
2330          *      If cs has already been parsed there should be a cached copy
2331          *      of conf already stored, so just return that.
2332          */
2333         conf = cf_data_find(cs, "tls-conf");
2334         if (conf) {
2335                 DEBUG("Using cached TLS configuration from previous invocation");
2336                 return conf;
2337         }
2338
2339         conf = talloc_zero(cs, fr_tls_server_conf_t);
2340         if (!conf) {
2341                 ERROR("Out of memory");
2342                 return NULL;
2343         }
2344
2345         talloc_set_destructor(conf, tls_server_conf_free);
2346
2347         if (cf_section_parse(cs, conf, tls_server_config) < 0) {
2348         error:
2349                 talloc_free(conf);
2350                 return NULL;
2351         }
2352
2353         /*
2354          *      Save people from their own stupidity.
2355          */
2356         if (conf->fragment_size < 100) conf->fragment_size = 100;
2357
2358         if (!conf->private_key_file) {
2359                 ERROR("TLS Server requires a private key file");
2360                 goto error;
2361         }
2362
2363         if (!conf->certificate_file) {
2364                 ERROR("TLS Server requires a certificate file");
2365                 goto error;
2366         }
2367
2368         /*
2369          *      Initialize TLS
2370          */
2371         conf->ctx = init_tls_ctx(conf, 0);
2372         if (conf->ctx == NULL) {
2373                 goto error;
2374         }
2375
2376 #ifdef HAVE_OPENSSL_OCSP_H
2377         /*
2378          *      Initialize OCSP Revocation Store
2379          */
2380         if (conf->ocsp_enable) {
2381                 conf->ocsp_store = init_revocation_store(conf);
2382                 if (conf->ocsp_store == NULL) goto error;
2383         }
2384 #endif /*HAVE_OPENSSL_OCSP_H*/
2385
2386         if (load_dh_params(conf->ctx, conf->dh_file) < 0) {
2387                 goto error;
2388         }
2389
2390         if (generate_eph_rsa_key(conf->ctx) < 0) {
2391                 goto error;
2392         }
2393
2394         if (conf->verify_tmp_dir) {
2395                 if (chmod(conf->verify_tmp_dir, S_IRWXU) < 0) {
2396                         ERROR("Failed changing permissions on %s: %s", conf->verify_tmp_dir, fr_syserror(errno));
2397                         goto error;
2398                 }
2399         }
2400
2401         if (conf->verify_client_cert_cmd && !conf->verify_tmp_dir) {
2402                 ERROR("You MUST set the verify directory in order to use verify_client_cmd");
2403                 goto error;
2404         }
2405
2406         /*
2407          *      Cache conf in cs in case we're asked to parse this again.
2408          */
2409         cf_data_add(cs, "tls-conf", conf, NULL);
2410
2411         return conf;
2412 }
2413
2414 fr_tls_server_conf_t *tls_client_conf_parse(CONF_SECTION *cs)
2415 {
2416         fr_tls_server_conf_t *conf;
2417
2418         conf = cf_data_find(cs, "tls-conf");
2419         if (conf) {
2420                 DEBUG("Using cached TLS configuration from previous invocation");
2421                 return conf;
2422         }
2423
2424         conf = talloc_zero(cs, fr_tls_server_conf_t);
2425         if (!conf) {
2426                 ERROR("Out of memory");
2427                 return NULL;
2428         }
2429
2430         talloc_set_destructor(conf, tls_server_conf_free);
2431
2432         if (cf_section_parse(cs, conf, tls_client_config) < 0) {
2433         error:
2434                 talloc_free(conf);
2435                 return NULL;
2436         }
2437
2438         /*
2439          *      Save people from their own stupidity.
2440          */
2441         if (conf->fragment_size < 100) conf->fragment_size = 100;
2442
2443         /*
2444          *      Initialize TLS
2445          */
2446         conf->ctx = init_tls_ctx(conf, 1);
2447         if (conf->ctx == NULL) {
2448                 goto error;
2449         }
2450
2451         if (load_dh_params(conf->ctx, conf->dh_file) < 0) {
2452                 goto error;
2453         }
2454
2455         if (generate_eph_rsa_key(conf->ctx) < 0) {
2456                 goto error;
2457         }
2458
2459         cf_data_add(cs, "tls-conf", conf, NULL);
2460
2461         return conf;
2462 }
2463
2464 int tls_success(tls_session_t *ssn, REQUEST *request)
2465 {
2466         VALUE_PAIR *vp, *vps = NULL;
2467         fr_tls_server_conf_t *conf;
2468
2469         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CONF);
2470         rad_assert(conf != NULL);
2471
2472         /*
2473          *      If there's no session resumption, delete the entry
2474          *      from the cache.  This means either it's disabled
2475          *      globally for this SSL context, OR we were told to
2476          *      disable it for this user.
2477          *
2478          *      This also means you can't turn it on just for one
2479          *      user.
2480          */
2481         if ((!ssn->allow_session_resumption) ||
2482             (((vp = pairfind(request->config_items, 1127, 0, TAG_ANY)) != NULL) &&
2483              (vp->vp_integer == 0))) {
2484                 SSL_CTX_remove_session(ssn->ctx,
2485                                        ssn->ssl->session);
2486                 ssn->allow_session_resumption = 0;
2487
2488                 /*
2489                  *      If we're in a resumed session and it's
2490                  *      not allowed,
2491                  */
2492                 if (SSL_session_reused(ssn->ssl)) {
2493                         RDEBUG("FAIL: Forcibly stopping session resumption as it is not allowed.");
2494                         return -1;
2495                 }
2496
2497                 /*
2498                  *      Else resumption IS allowed, so we store the
2499                  *      user data in the cache.
2500                  */
2501         } else if (!SSL_session_reused(ssn->ssl)) {
2502                 size_t size;
2503                 VALUE_PAIR **certs;
2504                 char buffer[2 * MAX_SESSION_SIZE + 1];
2505
2506                 size = ssn->ssl->session->session_id_length;
2507                 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
2508
2509                 fr_bin2hex(buffer, ssn->ssl->session->session_id, size);
2510
2511                 vp = paircopy2(NULL, request->reply->vps, PW_USER_NAME, 0, TAG_ANY);
2512                 if (vp) pairadd(&vps, vp);
2513
2514                 vp = paircopy2(NULL, request->packet->vps, PW_STRIPPED_USER_NAME, 0, TAG_ANY);
2515                 if (vp) pairadd(&vps, vp);
2516
2517                 vp = paircopy2(NULL, request->reply->vps, PW_CHARGEABLE_USER_IDENTITY, 0, TAG_ANY);
2518                 if (vp) pairadd(&vps, vp);
2519
2520                 vp = paircopy2(NULL, request->reply->vps, PW_CACHED_SESSION_POLICY, 0, TAG_ANY);
2521                 if (vp) pairadd(&vps, vp);
2522
2523                 certs = (VALUE_PAIR **)SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CERTS);
2524
2525                 /*
2526                  *      Hmm... the certs should probably be session data.
2527                  */
2528                 if (certs) {
2529                         /*
2530                          *      @todo: some go into reply, others into
2531                          *      request
2532                          */
2533                         pairadd(&vps, paircopy(NULL, *certs));
2534                 }
2535
2536                 if (vps) {
2537                         RDEBUG2("Saving session %s vps %p in the cache", buffer, vps);
2538                         SSL_SESSION_set_ex_data(ssn->ssl->session,
2539                                                 FR_TLS_EX_INDEX_VPS, vps);
2540                         if (conf->session_cache_path) {
2541                                 /* write the VPs to the cache file */
2542                                 char filename[256], buf[1024];
2543                                 FILE *vp_file;
2544
2545                                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
2546                                         conf->session_cache_path, FR_DIR_SEP, buffer
2547                                         );
2548                                 vp_file = fopen(filename, "w");
2549                                 if (vp_file == NULL) {
2550                                         RDEBUG2("Could not write session VPs to persistent cache: %s", fr_syserror(errno));
2551                                 } else {
2552                                         vp_cursor_t cursor;
2553                                         /* generate a dummy user-style entry which is easy to read back */
2554                                         fprintf(vp_file, "# SSL cached session\n");
2555                                         fprintf(vp_file, "%s\n", buffer);
2556                                         for (vp = fr_cursor_init(&cursor, &vps);
2557                                              vp;
2558                                              vp = fr_cursor_next(&cursor)) {
2559                                                 vp_prints(buf, sizeof(buf), vp);
2560                                                 fprintf(vp_file, "\t%s,\n", buf);
2561                                         }
2562                                         fclose(vp_file);
2563                                 }
2564                         }
2565                 } else {
2566                         RWDEBUG2("No information to cache: session caching will be disabled for session %s", buffer);
2567                         SSL_CTX_remove_session(ssn->ctx,
2568                                                ssn->ssl->session);
2569                 }
2570
2571                 /*
2572                  *      Else the session WAS allowed.  Copy the cached
2573                  *      reply.
2574                  */
2575         } else {
2576                 size_t size;
2577                 char buffer[2 * MAX_SESSION_SIZE + 1];
2578
2579                 size = ssn->ssl->session->session_id_length;
2580                 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
2581
2582                 fr_bin2hex(buffer, ssn->ssl->session->session_id, size);
2583
2584                 vps = SSL_SESSION_get_ex_data(ssn->ssl->session,
2585                                              FR_TLS_EX_INDEX_VPS);
2586                 if (!vps) {
2587                         RWDEBUG("No information in cached session %s", buffer);
2588                         return -1;
2589
2590                 } else {
2591                         vp_cursor_t cursor;
2592
2593                         RDEBUG("Adding cached attributes for session %s:", buffer);
2594                         debug_pair_list(vps);
2595
2596                         for (vp = fr_cursor_init(&cursor, &vps);
2597                              vp;
2598                              vp = fr_cursor_next(&cursor)) {
2599                                 /*
2600                                  *      TLS-* attrs get added back to
2601                                  *      the request list.
2602                                  */
2603                                 if ((vp->da->vendor == 0) &&
2604                                     (vp->da->attr >= 1910) &&
2605                                     (vp->da->attr < 1929)) {
2606                                         pairadd(&request->packet->vps,
2607                                                 paircopyvp(request->packet, vp));
2608                                 } else {
2609                                         pairadd(&request->reply->vps,
2610                                                 paircopyvp(request->packet, vp));
2611                                 }
2612                         }
2613
2614                         if (conf->session_cache_path) {
2615                                 /* "touch" the cached session/vp file */
2616                                 char filename[256];
2617
2618                                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
2619                                         conf->session_cache_path, FR_DIR_SEP, buffer
2620                                         );
2621                                 utime(filename, NULL);
2622                                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
2623                                         conf->session_cache_path, FR_DIR_SEP, buffer
2624                                         );
2625                                 utime(filename, NULL);
2626                         }
2627
2628                         /*
2629                          *      Mark the request as resumed.
2630                          */
2631                         pairmake_packet("EAP-Session-Resumed", "1", T_OP_SET);
2632                 }
2633         }
2634
2635         return 0;
2636 }
2637
2638
2639 void tls_fail(tls_session_t *ssn)
2640 {
2641         /*
2642          *      Force the session to NOT be cached.
2643          */
2644         SSL_CTX_remove_session(ssn->ctx, ssn->ssl->session);
2645 }
2646
2647 fr_tls_status_t tls_application_data(tls_session_t *ssn,
2648                                      REQUEST *request)
2649
2650 {
2651         int err;
2652
2653         /*
2654          *      Decrypt the complete record.
2655          */
2656         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data,
2657                         ssn->dirty_in.used);
2658         if (err != (int) ssn->dirty_in.used) {
2659                 record_init(&ssn->dirty_in);
2660                 RDEBUG("Failed writing %d to SSL BIO: %d",
2661                        ssn->dirty_in.used, err);
2662                 return FR_TLS_FAIL;
2663         }
2664
2665         /*
2666          *      Clear the dirty buffer now that we are done with it
2667          *      and init the clean_out buffer to store decrypted data
2668          */
2669         record_init(&ssn->dirty_in);
2670         record_init(&ssn->clean_out);
2671
2672         /*
2673          *      Read (and decrypt) the tunneled data from the
2674          *      SSL session, and put it into the decrypted
2675          *      data buffer.
2676          */
2677         err = SSL_read(ssn->ssl, ssn->clean_out.data,
2678                        sizeof(ssn->clean_out.data));
2679
2680         if (err < 0) {
2681                 int code;
2682
2683                 RDEBUG("SSL_read Error");
2684
2685                 code = SSL_get_error(ssn->ssl, err);
2686                 switch (code) {
2687                 case SSL_ERROR_WANT_READ:
2688                         DEBUG("Error in fragmentation logic: SSL_WANT_READ");
2689                         return FR_TLS_MORE_FRAGMENTS;
2690
2691                 case SSL_ERROR_WANT_WRITE:
2692                         DEBUG("Error in fragmentation logic: SSL_WANT_WRITE");
2693                         break;
2694
2695                 default:
2696                         DEBUG("Error in fragmentation logic: %s",
2697                               ERR_error_string(code, NULL));
2698
2699                         /*
2700                          *      FIXME: Call int_ssl_check?
2701                          */
2702                         break;
2703                 }
2704                 return FR_TLS_FAIL;
2705         }
2706
2707         if (err == 0) {
2708                 RWDEBUG("No data inside of the tunnel.");
2709         }
2710
2711         /*
2712          *      Passed all checks, successfully decrypted data
2713          */
2714         ssn->clean_out.used = err;
2715
2716         return FR_TLS_OK;
2717 }
2718
2719
2720 /*
2721  * Acknowledge received is for one of the following messages sent earlier
2722  * 1. Handshake completed Message, so now send, EAP-Success
2723  * 2. Alert Message, now send, EAP-Failure
2724  * 3. Fragment Message, now send, next Fragment
2725  */
2726 fr_tls_status_t tls_ack_handler(tls_session_t *ssn, REQUEST *request)
2727 {
2728         RDEBUG2("Received TLS ACK");
2729
2730         if (ssn == NULL){
2731                 RERROR("FAIL: Unexpected ACK received.  Could not obtain session information.");
2732                 return FR_TLS_INVALID;
2733         }
2734         if (ssn->info.initialized == 0) {
2735                 RDEBUG("No SSL info available. Waiting for more SSL data.");
2736                 return FR_TLS_REQUEST;
2737         }
2738         if ((ssn->info.content_type == handshake) &&
2739             (ssn->info.origin == 0)) {
2740                 RERROR("FAIL: ACK without earlier message.");
2741                 return FR_TLS_INVALID;
2742         }
2743
2744         switch (ssn->info.content_type) {
2745         case alert:
2746                 RDEBUG2("ACK alert");
2747                 return FR_TLS_FAIL;
2748
2749         case handshake:
2750                 if ((ssn->info.handshake_type == finished) &&
2751                     (ssn->dirty_out.used == 0)) {
2752                         RDEBUG2("ACK handshake is finished");
2753
2754                         /*
2755                          *      From now on all the content is
2756                          *      application data set it here as nobody else
2757                          *      sets it.
2758                          */
2759                         ssn->info.content_type = application_data;
2760                         return FR_TLS_SUCCESS;
2761                 } /* else more data to send */
2762
2763                 RDEBUG2("ACK handshake fragment handler");
2764                 /* Fragmentation handler, send next fragment */
2765                 return FR_TLS_REQUEST;
2766
2767         case application_data:
2768                 RDEBUG2("ACK handshake fragment handler in application data");
2769                 return FR_TLS_REQUEST;
2770
2771                 /*
2772                  *      For the rest of the conditions, switch over
2773                  *      to the default section below.
2774                  */
2775         default:
2776                 RDEBUG2("ACK default");
2777                 RERROR("Invalid ACK received: %d",
2778                        ssn->info.content_type);
2779                 return FR_TLS_INVALID;
2780         }
2781 }
2782
2783 #endif  /* WITH_TLS */
2784