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 #include <ctype.h>
  44
  45 #ifdef WITH_TLS
  46 #  ifdef HAVE_OPENSSL_RAND_H
  47 #    include <openssl/rand.h>
  48 #  endif
  49
  50 #  ifdef HAVE_OPENSSL_OCSP_H
  51 #    include <openssl/ocsp.h>
  52 #  endif
  53
  54 #  ifdef HAVE_OPENSSL_EVP_H
  55 #    include <openssl/evp.h>
  56 #  endif
  57 #  include <openssl/ssl.h>
  58
  59 #ifdef ENABLE_OPENSSL_VERSION_CHECK
  60 typedef struct libssl_defect {
  61         uint64_t        high;
  62         uint64_t        low;
  63
  64         char const      *id;
  65         char const      *name;
  66         char const      *comment;
  67 } libssl_defect_t;
  68
  69 /* Record critical defects in libssl here (newest first)*/
  70 static libssl_defect_t libssl_defects[] =
  71 {
  72         {
  73                 .low            = 0x010001000,          /* 1.0.1  */
  74                 .high           = 0x01000106f,          /* 1.0.1f */
  75                 .id             = "CVE-2014-0160",
  76                 .name           = "Heartbleed",
  77                 .comment        = "For more information see http://heartbleed.com"
  78         }
  79 };
  80 #endif
  81
  82 /* index we use to store cached session VPs
  83  * needs to be dynamic so we can supply a "free" function
  84  */
  85 static int fr_tls_ex_index_vps = -1;
  86 int fr_tls_ex_index_certs = -1;
  87
  88 /* Session */
  89 static void             session_close(tls_session_t *ssn);
  90 static void             session_init(tls_session_t *ssn);
  91
  92 /* record */
  93 static void             record_init(record_t *buf);
  94 static void             record_close(record_t *buf);
  95 static unsigned int     record_plus(record_t *buf, void const *ptr,
  96                                     unsigned int size);
  97 static unsigned int     record_minus(record_t *buf, void *ptr,
  98                                      unsigned int size);
  99
 100 #ifdef PSK_MAX_IDENTITY_LEN
 101 static bool identity_is_safe(const char *identity)
 102 {
 103         char c;
 104
 105         if (!identity) return true;
 106
 107         while ((c = *(identity++)) != '\0') {
 108                 if (isalpha((int) c) || isdigit((int) c) || isspace((int) c) ||
 109                     (c == '@') || (c == '-') || (c == '_') || (c == '.')) {
 110                         continue;
 111                 }
 112
 113                 return false;
 114         }
 115
 116         return true;
 117 }
 118
 119
 120 /*
 121  *      When a client uses TLS-PSK to talk to a server, this callback
 122  *      is used by the server to determine the PSK to use.
 123  */
 124 static unsigned int psk_server_callback(SSL *ssl, const char *identity,
 125                                         unsigned char *psk,
 126                                         unsigned int max_psk_len)
 127 {
 128         unsigned int psk_len = 0;
 129         fr_tls_server_conf_t *conf;
 130         REQUEST *request;
 131
 132         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl,
 133                                                        FR_TLS_EX_INDEX_CONF);
 134         if (!conf) return 0;
 135
 136         request = (REQUEST *)SSL_get_ex_data(ssl,
 137                                              FR_TLS_EX_INDEX_REQUEST);
 138         if (request && conf->psk_query) {
 139                 size_t hex_len;
 140                 VALUE_PAIR *vp;
 141                 char buffer[2 * PSK_MAX_PSK_LEN + 4]; /* allow for too-long keys */
 142
 143                 /*
 144                  *      The passed identity is weird.  Deny it.
 145                  */
 146                 if (!identity_is_safe(identity)) {
 147                         RWDEBUG("Invalid characters in PSK identity %s", identity);
 148                         return 0;
 149                 }
 150
 151                 vp = pairmake_packet("TLS-PSK-Identity", identity, T_OP_SET);
 152                 if (!vp) return 0;
 153
 154                 hex_len = radius_xlat(buffer, sizeof(buffer), request, conf->psk_query,
 155                                       NULL, NULL);
 156                 if (!hex_len) {
 157                         RWDEBUG("PSK expansion returned an empty string.");
 158                         return 0;
 159                 }
 160
 161                 /*
 162                  *      The returned key is truncated at MORE than
 163                  *      OpenSSL can handle.  That way we can detect
 164                  *      the truncation, and complain about it.
 165                  */
 166                 if (hex_len > (2 * max_psk_len)) {
 167                         RWDEBUG("Returned PSK is too long (%u > %u)",
 168                                 (unsigned int) hex_len, 2 * max_psk_len);
 169                         return 0;
 170                 }
 171
 172                 /*
 173                  *      Leave the TLS-PSK-Identity in the request, and
 174                  *      convert the expansion from printable string
 175                  *      back to hex.
 176                  */
 177                 return fr_hex2bin(psk, max_psk_len, buffer, hex_len);
 178         }
 179
 180         if (!conf->psk_identity) {
 181                 DEBUG("No static PSK identity set.  Rejecting the user");
 182                 return 0;
 183         }
 184
 185         /*
 186          *      No REQUEST, or no dynamic query.  Just look for a
 187          *      static identity.
 188          */
 189         if (strcmp(identity, conf->psk_identity) != 0) {
 190                 ERROR("Supplied PSK identity %s does not match configuration.  Rejecting.",
 191                       identity);
 192                 return 0;
 193         }
 194
 195         psk_len = strlen(conf->psk_password);
 196         if (psk_len > (2 * max_psk_len)) return 0;
 197
 198         return fr_hex2bin(psk, max_psk_len, conf->psk_password, psk_len);
 199 }
 200
 201 static unsigned int psk_client_callback(SSL *ssl, UNUSED char const *hint,
 202                                         char *identity, unsigned int max_identity_len,
 203                                         unsigned char *psk, unsigned int max_psk_len)
 204 {
 205         unsigned int psk_len;
 206         fr_tls_server_conf_t *conf;
 207
 208         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl,
 209                                                        FR_TLS_EX_INDEX_CONF);
 210         if (!conf) return 0;
 211
 212         psk_len = strlen(conf->psk_password);
 213         if (psk_len > (2 * max_psk_len)) return 0;
 214
 215         strlcpy(identity, conf->psk_identity, max_identity_len);
 216
 217         return fr_hex2bin(psk, max_psk_len, conf->psk_password, psk_len);
 218 }
 219
 220 #endif
 221
 222 static int _tls_session_free(tls_session_t *ssn)
 223 {
 224         /*
 225          *      Free any opaque TTLS or PEAP data.
 226          */
 227         if ((ssn->opaque) && (ssn->free_opaque)) {
 228                 ssn->free_opaque(ssn->opaque);
 229                 ssn->opaque = NULL;
 230         }
 231
 232         session_close(ssn);
 233
 234         return 0;
 235 }
 236
 237 tls_session_t *tls_new_client_session(TALLOC_CTX *ctx, fr_tls_server_conf_t *conf, int fd)
 238 {
 239         int verify_mode;
 240         tls_session_t *ssn = NULL;
 241         REQUEST *request;
 242
 243         ssn = talloc_zero(ctx, tls_session_t);
 244         if (!ssn) return NULL;
 245
 246         talloc_set_destructor(ssn, _tls_session_free);
 247
 248         ssn->ctx = conf->ctx;
 249
 250         SSL_CTX_set_mode(ssn->ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER | SSL_MODE_AUTO_RETRY);
 251
 252         ssn->ssl = SSL_new(ssn->ctx);
 253         if (!ssn->ssl) {
 254                 talloc_free(ssn);
 255                 return NULL;
 256         }
 257
 258         request = request_alloc(ssn);
 259         SSL_set_ex_data(ssn->ssl, FR_TLS_EX_INDEX_REQUEST, (void *)request);
 260
 261         /*
 262          *      Add the message callback to identify what type of
 263          *      message/handshake is passed
 264          */
 265         SSL_set_msg_callback(ssn->ssl, cbtls_msg);
 266         SSL_set_msg_callback_arg(ssn->ssl, ssn);
 267         SSL_set_info_callback(ssn->ssl, cbtls_info);
 268
 269         /*
 270          *      Always verify the peer certificate.
 271          */
 272         DEBUG2("Requiring Server certificate");
 273         verify_mode = SSL_VERIFY_PEER;
 274         verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
 275         SSL_set_verify(ssn->ssl, verify_mode, cbtls_verify);
 276
 277         SSL_set_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CONF, (void *)conf);
 278         SSL_set_ex_data(ssn->ssl, FR_TLS_EX_INDEX_SSN, (void *)ssn);
 279         SSL_set_fd(ssn->ssl, fd);
 280         if (SSL_connect(ssn->ssl) <= 0) {
 281                 int err;
 282                 while ((err = ERR_get_error())) {
 283                         ERROR("tls: %s", ERR_error_string(err, NULL));
 284                 }
 285                 talloc_free(ssn);
 286
 287                 return NULL;
 288         }
 289
 290         ssn->offset = conf->fragment_size;
 291
 292         return ssn;
 293 }
 294
 295
 296 /** Create a new TLS session
 297  *
 298  * Configures a new TLS session, configuring options, setting callbacks etc...
 299  *
 300  * @param ctx to alloc session data in. Should usually be NULL unless the lifetime of the
 301  *      session is tied to another talloc'd object.
 302  * @param conf to use to configure the tls session.
 303  * @param request The current #REQUEST.
 304  * @param client_cert Whether to require a client_cert.
 305  * @return a new session on success, or NULL on error.
 306  */
 307 tls_session_t *tls_new_session(TALLOC_CTX *ctx, fr_tls_server_conf_t *conf, REQUEST *request, bool client_cert)
 308 {
 309         tls_session_t *state = NULL;
 310         SSL *new_tls = NULL;
 311         int             verify_mode = 0;
 312         VALUE_PAIR      *vp;
 313
 314         rad_assert(request != NULL);
 315
 316         /*
 317          *      Manually flush the sessions every so often.  If HALF
 318          *      of the session lifetime has passed since we last
 319          *      flushed, then flush it again.
 320          *
 321          *      FIXME: Also do it every N sessions?
 322          */
 323         if (conf->session_cache_enable &&
 324             ((conf->session_last_flushed + ((int)conf->session_timeout * 1800)) <= request->timestamp)){
 325                 RDEBUG2("Flushing SSL sessions (of #%ld)",
 326                         SSL_CTX_sess_number(conf->ctx));
 327
 328                 SSL_CTX_flush_sessions(conf->ctx, request->timestamp);
 329                 conf->session_last_flushed = request->timestamp;
 330         }
 331
 332         if ((new_tls = SSL_new(conf->ctx)) == NULL) {
 333                 RERROR("Error creating new SSL session: %s", ERR_error_string(ERR_get_error(), NULL));
 334                 return NULL;
 335         }
 336
 337         /* We use the SSL's "app_data" to indicate a call-back */
 338         SSL_set_app_data(new_tls, NULL);
 339
 340         if ((state = talloc_zero(ctx, tls_session_t)) == NULL) {
 341                 RERROR("Error allocating memory for SSL state");
 342                 return NULL;
 343         }
 344         session_init(state);
 345         talloc_set_destructor(state, _tls_session_free);
 346
 347         state->ctx = conf->ctx;
 348         state->ssl = new_tls;
 349
 350         /*
 351          *      Initialize callbacks
 352          */
 353         state->record_init = record_init;
 354         state->record_close = record_close;
 355         state->record_plus = record_plus;
 356         state->record_minus = record_minus;
 357
 358         /*
 359          *      Create & hook the BIOs to handle the dirty side of the
 360          *      SSL.  This is *very important* as we want to handle
 361          *      the transmission part.  Now the only IO interface
 362          *      that SSL is aware of, is our defined BIO buffers.
 363          *
 364          *      This means that all SSL IO is done to/from memory,
 365          *      and we can update those BIOs from the packets we've
 366          *      received.
 367          */
 368         state->into_ssl = BIO_new(BIO_s_mem());
 369         state->from_ssl = BIO_new(BIO_s_mem());
 370         SSL_set_bio(state->ssl, state->into_ssl, state->from_ssl);
 371
 372         /*
 373          *      Add the message callback to identify what type of
 374          *      message/handshake is passed
 375          */
 376         SSL_set_msg_callback(new_tls, cbtls_msg);
 377         SSL_set_msg_callback_arg(new_tls, state);
 378         SSL_set_info_callback(new_tls, cbtls_info);
 379
 380         /*
 381          *      In Server mode we only accept.
 382          */
 383         SSL_set_accept_state(state->ssl);
 384
 385         /*
 386          *      Verify the peer certificate, if asked.
 387          */
 388         if (client_cert) {
 389                 RDEBUG2("Requiring client certificate");
 390                 verify_mode = SSL_VERIFY_PEER;
 391                 verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
 392                 verify_mode |= SSL_VERIFY_CLIENT_ONCE;
 393         }
 394         SSL_set_verify(state->ssl, verify_mode, cbtls_verify);
 395
 396         SSL_set_ex_data(state->ssl, FR_TLS_EX_INDEX_CONF, (void *)conf);
 397         SSL_set_ex_data(state->ssl, FR_TLS_EX_INDEX_SSN, (void *)state);
 398         state->length_flag = conf->include_length;
 399
 400         /*
 401          *      We use default fragment size, unless the Framed-MTU
 402          *      tells us it's too big.  Note that we do NOT account
 403          *      for the EAP-TLS headers if conf->fragment_size is
 404          *      large, because that config item looks to be confusing.
 405          *
 406          *      i.e. it should REALLY be called MTU, and the code here
 407          *      should figure out what that means for TLS fragment size.
 408          *      asking the administrator to know the internal details
 409          *      of EAP-TLS in order to calculate fragment sizes is
 410          *      just too much.
 411          */
 412         state->offset = conf->fragment_size;
 413         vp = pairfind(request->packet->vps, PW_FRAMED_MTU, 0, TAG_ANY);
 414         if (vp && (vp->vp_integer > 100) && (vp->vp_integer < state->offset)) {
 415                 state->offset = vp->vp_integer;
 416         }
 417
 418         if (conf->session_cache_enable) state->allow_session_resumption = true; /* otherwise it's false */
 419
 420         RDEBUG2("Initiate");
 421
 422         return state;
 423 }
 424
 425 /*
 426  *      Print out some text describing the error.
 427  */
 428 static int int_ssl_check(REQUEST *request, SSL *s, int ret, char const *text)
 429 {
 430         int e;
 431         unsigned long l;
 432
 433         if ((l = ERR_get_error()) != 0) {
 434                 char const *p = ERR_error_string(l, NULL);
 435
 436                 if (request && p) REDEBUG("SSL says: %s", p);
 437         }
 438         e = SSL_get_error(s, ret);
 439
 440         switch (e) {
 441                 /*
 442                  *      These seem to be harmless and already "dealt
 443                  *      with" by our non-blocking environment. NB:
 444                  *      "ZERO_RETURN" is the clean "error"
 445                  *      indicating a successfully closed SSL
 446                  *      tunnel. We let this happen because our IO
 447                  *      loop should not appear to have broken on
 448                  *      this condition - and outside the IO loop, the
 449                  *      "shutdown" state is checked.
 450                  *
 451                  *      Don't print anything if we ignore the error.
 452                  */
 453         case SSL_ERROR_NONE:
 454         case SSL_ERROR_WANT_READ:
 455         case SSL_ERROR_WANT_WRITE:
 456         case SSL_ERROR_WANT_X509_LOOKUP:
 457         case SSL_ERROR_ZERO_RETURN:
 458                 break;
 459
 460                 /*
 461                  *      These seem to be indications of a genuine
 462                  *      error that should result in the SSL tunnel
 463                  *      being regarded as "dead".
 464                  */
 465         case SSL_ERROR_SYSCALL:
 466                 ERROR("SSL: %s failed in a system call (%d), TLS session fails.",
 467                        text, ret);
 468                 return 0;
 469
 470         case SSL_ERROR_SSL:
 471                 ERROR("SSL: %s failed inside of TLS (%d), TLS session fails.",
 472                        text, ret);
 473                 return 0;
 474
 475         default:
 476                 /*
 477                  *      For any other errors that (a) exist, and (b)
 478                  *      crop up - we need to interpret what to do with
 479                  *      them - so "politely inform" the caller that
 480                  *      the code needs updating here.
 481                  */
 482                 ERROR("SSL: FATAL SSL error ..... %d\n", e);
 483                 return 0;
 484         }
 485
 486         return 1;
 487 }
 488
 489 /*
 490  * We are the server, we always get the dirty data
 491  * (Handshake data is also considered as dirty data)
 492  * During handshake, since SSL API handles itself,
 493  * After clean-up, dirty_out will be filled with
 494  * the data required for handshaking. So we check
 495  * if dirty_out is empty then we simply send it back.
 496  * As of now, if handshake is successful, then we keep going,
 497  * otherwise we fail.
 498  *
 499  * Fill the Bio with the dirty data to clean it
 500  * Get the cleaned data from SSL, if it is not Handshake data
 501  */
 502 int tls_handshake_recv(REQUEST *request, tls_session_t *ssn)
 503 {
 504         int err;
 505
 506         if (ssn->invalid_hb_used) return 0;
 507
 508         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data, ssn->dirty_in.used);
 509         if (err != (int) ssn->dirty_in.used) {
 510                 RDEBUG("Failed writing %d to SSL BIO: %d", ssn->dirty_in.used,
 511                         err);
 512                 record_init(&ssn->dirty_in);
 513                 return 0;
 514         }
 515         record_init(&ssn->dirty_in);
 516
 517         err = SSL_read(ssn->ssl, ssn->clean_out.data + ssn->clean_out.used,
 518                        sizeof(ssn->clean_out.data) - ssn->clean_out.used);
 519         if (err > 0) {
 520                 ssn->clean_out.used += err;
 521                 return 1;
 522         }
 523
 524         if (!int_ssl_check(request, ssn->ssl, err, "SSL_read")) {
 525                 return 0;
 526         }
 527
 528         /* Some Extra STATE information for easy debugging */
 529         if (SSL_is_init_finished(ssn->ssl)) {
 530                 DEBUG2("SSL Connection Established\n");
 531         }
 532         if (SSL_in_init(ssn->ssl)) {
 533                 DEBUG2("In SSL Handshake Phase\n");
 534         }
 535         if (SSL_in_before(ssn->ssl)) {
 536                 DEBUG2("Before SSL Handshake Phase\n");
 537         }
 538         if (SSL_in_accept_init(ssn->ssl)) {
 539                 DEBUG2("In SSL Accept mode \n");
 540         }
 541         if (SSL_in_connect_init(ssn->ssl)) {
 542                 DEBUG2("In SSL Connect mode \n");
 543         }
 544
 545         err = BIO_ctrl_pending(ssn->from_ssl);
 546         if (err > 0) {
 547                 err = BIO_read(ssn->from_ssl, ssn->dirty_out.data,
 548                                sizeof(ssn->dirty_out.data));
 549                 if (err > 0) {
 550                         ssn->dirty_out.used = err;
 551
 552                 } else if (BIO_should_retry(ssn->from_ssl)) {
 553                         record_init(&ssn->dirty_in);
 554                         DEBUG2("  tls: Asking for more data in tunnel");
 555                         return 1;
 556
 557                 } else {
 558                         int_ssl_check(request, ssn->ssl, err, "BIO_read");
 559                         record_init(&ssn->dirty_in);
 560                         return 0;
 561                 }
 562         } else {
 563                 DEBUG2("SSL Application Data");
 564                 /* Its clean application data, do whatever we want */
 565                 record_init(&ssn->clean_out);
 566         }
 567
 568         /* We are done with dirty_in, reinitialize it */
 569         record_init(&ssn->dirty_in);
 570         return 1;
 571 }
 572
 573 /*
 574  *      Take cleartext user data, and encrypt it into the output buffer,
 575  *      to send to the client at the other end of the SSL connection.
 576  */
 577 int tls_handshake_send(REQUEST *request, tls_session_t *ssn)
 578 {
 579         int err;
 580
 581         /*
 582          *      If there's un-encrypted data in 'clean_in', then write
 583          *      that data to the SSL session, and then call the BIO function
 584          *      to get that encrypted data from the SSL session, into
 585          *      a buffer which we can then package into an EAP packet.
 586          *
 587          *      Based on Server's logic this clean_in is expected to
 588          *      contain the data to send to the client.
 589          */
 590         if (ssn->clean_in.used > 0) {
 591                 int written;
 592
 593                 written = SSL_write(ssn->ssl, ssn->clean_in.data, ssn->clean_in.used);
 594                 record_minus(&ssn->clean_in, NULL, written);
 595
 596                 /* Get the dirty data from Bio to send it */
 597                 err = BIO_read(ssn->from_ssl, ssn->dirty_out.data,
 598                                sizeof(ssn->dirty_out.data));
 599                 if (err > 0) {
 600                         ssn->dirty_out.used = err;
 601                 } else {
 602                         int_ssl_check(request, ssn->ssl, err, "handshake_send");
 603                 }
 604         }
 605
 606         return 1;
 607 }
 608
 609 static void session_init(tls_session_t *ssn)
 610 {
 611         ssn->ssl = NULL;
 612         ssn->into_ssl = ssn->from_ssl = NULL;
 613         record_init(&ssn->clean_in);
 614         record_init(&ssn->clean_out);
 615         record_init(&ssn->dirty_in);
 616         record_init(&ssn->dirty_out);
 617
 618         memset(&ssn->info, 0, sizeof(ssn->info));
 619
 620         ssn->offset = 0;
 621         ssn->fragment = 0;
 622         ssn->tls_msg_len = 0;
 623         ssn->length_flag = 0;
 624         ssn->opaque = NULL;
 625         ssn->free_opaque = NULL;
 626 }
 627
 628 static void session_close(tls_session_t *ssn)
 629 {
 630         SSL_set_quiet_shutdown(ssn->ssl, 1);
 631         SSL_shutdown(ssn->ssl);
 632
 633         if (ssn->ssl) {
 634                 SSL_free(ssn->ssl);
 635                 ssn->ssl = NULL;
 636         }
 637
 638         record_close(&ssn->clean_in);
 639         record_close(&ssn->clean_out);
 640         record_close(&ssn->dirty_in);
 641         record_close(&ssn->dirty_out);
 642         session_init(ssn);
 643 }
 644
 645 static void record_init(record_t *rec)
 646 {
 647         rec->used = 0;
 648 }
 649
 650 static void record_close(record_t *rec)
 651 {
 652         rec->used = 0;
 653 }
 654
 655
 656 /*
 657  *      Copy data to the intermediate buffer, before we send
 658  *      it somewhere.
 659  */
 660 static unsigned int record_plus(record_t *rec, void const *ptr,
 661                                 unsigned int size)
 662 {
 663         unsigned int added = MAX_RECORD_SIZE - rec->used;
 664
 665         if(added > size)
 666                 added = size;
 667         if(added == 0)
 668                 return 0;
 669         memcpy(rec->data + rec->used, ptr, added);
 670         rec->used += added;
 671         return added;
 672 }
 673
 674 /*
 675  *      Take data from the buffer, and give it to the caller.
 676  */
 677 static unsigned int record_minus(record_t *rec, void *ptr,
 678                                  unsigned int size)
 679 {
 680         unsigned int taken = rec->used;
 681
 682         if(taken > size)
 683                 taken = size;
 684         if(taken == 0)
 685                 return 0;
 686         if(ptr)
 687                 memcpy(ptr, rec->data, taken);
 688         rec->used -= taken;
 689
 690         /*
 691          *      This is pretty bad...
 692          */
 693         if(rec->used > 0)
 694                 memmove(rec->data, rec->data + taken, rec->used);
 695         return taken;
 696 }
 697
 698 void tls_session_information(tls_session_t *tls_session)
 699 {
 700         char const *str_write_p, *str_version, *str_content_type = "";
 701         char const *str_details1 = "", *str_details2= "";
 702         REQUEST *request;
 703
 704         /*
 705          *      Don't print this out in the normal course of
 706          *      operations.
 707          */
 708         if (debug_flag == 0) {
 709                 return;
 710         }
 711
 712         str_write_p = tls_session->info.origin ? ">>>" : "<<<";
 713
 714         switch (tls_session->info.version) {
 715         case SSL2_VERSION:
 716                 str_version = "SSL 2.0";
 717                 break;
 718         case SSL3_VERSION:
 719                 str_version = "SSL 3.0 ";
 720                 break;
 721         case TLS1_VERSION:
 722                 str_version = "TLS 1.0 ";
 723                 break;
 724         default:
 725                 str_version = "Unknown TLS version";
 726                 break;
 727         }
 728
 729         if (tls_session->info.version == SSL3_VERSION ||
 730             tls_session->info.version == TLS1_VERSION) {
 731                 switch (tls_session->info.content_type) {
 732                 case SSL3_RT_CHANGE_CIPHER_SPEC:
 733                         str_content_type = "ChangeCipherSpec";
 734                         break;
 735
 736                 case SSL3_RT_ALERT:
 737                         str_content_type = "Alert";
 738                         break;
 739
 740                 case SSL3_RT_HANDSHAKE:
 741                         str_content_type = "Handshake";
 742                         break;
 743
 744                 case SSL3_RT_APPLICATION_DATA:
 745                         str_content_type = "ApplicationData";
 746                         break;
 747
 748                 default:
 749                         str_content_type = "UnknownContentType";
 750                         break;
 751                 }
 752
 753                 if (tls_session->info.content_type == SSL3_RT_ALERT) {
 754                         str_details1 = ", ???";
 755
 756                         if (tls_session->info.record_len == 2) {
 757
 758                                 switch (tls_session->info.alert_level) {
 759                                 case SSL3_AL_WARNING:
 760                                         str_details1 = ", warning";
 761                                         break;
 762                                 case SSL3_AL_FATAL:
 763                                         str_details1 = ", fatal";
 764                                         break;
 765                                 }
 766
 767                                 str_details2 = " ???";
 768                                 switch (tls_session->info.alert_description) {
 769                                 case SSL3_AD_CLOSE_NOTIFY:
 770                                         str_details2 = " close_notify";
 771                                         break;
 772
 773                                 case SSL3_AD_UNEXPECTED_MESSAGE:
 774                                         str_details2 = " unexpected_message";
 775                                         break;
 776
 777                                 case SSL3_AD_BAD_RECORD_MAC:
 778                                         str_details2 = " bad_record_mac";
 779                                         break;
 780
 781                                 case TLS1_AD_DECRYPTION_FAILED:
 782                                         str_details2 = " decryption_failed";
 783                                         break;
 784
 785                                 case TLS1_AD_RECORD_OVERFLOW:
 786                                         str_details2 = " record_overflow";
 787                                         break;
 788
 789                                 case SSL3_AD_DECOMPRESSION_FAILURE:
 790                                         str_details2 = " decompression_failure";
 791                                         break;
 792
 793                                 case SSL3_AD_HANDSHAKE_FAILURE:
 794                                         str_details2 = " handshake_failure";
 795                                         break;
 796
 797                                 case SSL3_AD_BAD_CERTIFICATE:
 798                                         str_details2 = " bad_certificate";
 799                                         break;
 800
 801                                 case SSL3_AD_UNSUPPORTED_CERTIFICATE:
 802                                         str_details2 = " unsupported_certificate";
 803                                         break;
 804
 805                                 case SSL3_AD_CERTIFICATE_REVOKED:
 806                                         str_details2 = " certificate_revoked";
 807                                         break;
 808
 809                                 case SSL3_AD_CERTIFICATE_EXPIRED:
 810                                         str_details2 = " certificate_expired";
 811                                         break;
 812
 813                                 case SSL3_AD_CERTIFICATE_UNKNOWN:
 814                                         str_details2 = " certificate_unknown";
 815                                         break;
 816
 817                                 case SSL3_AD_ILLEGAL_PARAMETER:
 818                                         str_details2 = " illegal_parameter";
 819                                         break;
 820
 821                                 case TLS1_AD_UNKNOWN_CA:
 822                                         str_details2 = " unknown_ca";
 823                                         break;
 824
 825                                 case TLS1_AD_ACCESS_DENIED:
 826                                         str_details2 = " access_denied";
 827                                         break;
 828
 829                                 case TLS1_AD_DECODE_ERROR:
 830                                         str_details2 = " decode_error";
 831                                         break;
 832
 833                                 case TLS1_AD_DECRYPT_ERROR:
 834                                         str_details2 = " decrypt_error";
 835                                         break;
 836
 837                                 case TLS1_AD_EXPORT_RESTRICTION:
 838                                         str_details2 = " export_restriction";
 839                                         break;
 840
 841                                 case TLS1_AD_PROTOCOL_VERSION:
 842                                         str_details2 = " protocol_version";
 843                                         break;
 844
 845                                 case TLS1_AD_INSUFFICIENT_SECURITY:
 846                                         str_details2 = " insufficient_security";
 847                                         break;
 848
 849                                 case TLS1_AD_INTERNAL_ERROR:
 850                                         str_details2 = " internal_error";
 851                                         break;
 852
 853                                 case TLS1_AD_USER_CANCELLED:
 854                                         str_details2 = " user_canceled";
 855                                         break;
 856
 857                                 case TLS1_AD_NO_RENEGOTIATION:
 858                                         str_details2 = " no_renegotiation";
 859                                         break;
 860                                 }
 861                         }
 862                 }
 863
 864                 if (tls_session->info.content_type == SSL3_RT_HANDSHAKE) {
 865                         str_details1 = "???";
 866
 867                         if (tls_session->info.record_len > 0) switch (tls_session->info.handshake_type) {
 868                         case SSL3_MT_HELLO_REQUEST:
 869                                 str_details1 = ", HelloRequest";
 870                                 break;
 871
 872                         case SSL3_MT_CLIENT_HELLO:
 873                                 str_details1 = ", ClientHello";
 874                                 break;
 875
 876                         case SSL3_MT_SERVER_HELLO:
 877                                 str_details1 = ", ServerHello";
 878                                 break;
 879
 880                         case SSL3_MT_CERTIFICATE:
 881                                 str_details1 = ", Certificate";
 882                                 break;
 883
 884                         case SSL3_MT_SERVER_KEY_EXCHANGE:
 885                                 str_details1 = ", ServerKeyExchange";
 886                                 break;
 887
 888                         case SSL3_MT_CERTIFICATE_REQUEST:
 889                                 str_details1 = ", CertificateRequest";
 890                                 break;
 891
 892                         case SSL3_MT_SERVER_DONE:
 893                                 str_details1 = ", ServerHelloDone";
 894                                 break;
 895
 896                         case SSL3_MT_CERTIFICATE_VERIFY:
 897                                 str_details1 = ", CertificateVerify";
 898                                 break;
 899
 900                         case SSL3_MT_CLIENT_KEY_EXCHANGE:
 901                                 str_details1 = ", ClientKeyExchange";
 902                                 break;
 903
 904                         case SSL3_MT_FINISHED:
 905                                 str_details1 = ", Finished";
 906                                 break;
 907                         }
 908                 }
 909         }
 910
 911         snprintf(tls_session->info.info_description,
 912                  sizeof(tls_session->info.info_description),
 913                  "%s %s%s [length %04lx]%s%s\n",
 914                  str_write_p, str_version, str_content_type,
 915                  (unsigned long)tls_session->info.record_len,
 916                  str_details1, str_details2);
 917
 918         request = SSL_get_ex_data(tls_session->ssl, FR_TLS_EX_INDEX_REQUEST);
 919         if (request) {
 920                 RDEBUG2("%s", tls_session->info.info_description);
 921         } else {
 922                 DEBUG2("%s", tls_session->info.info_description);
 923         }
 924 }
 925
 926 static CONF_PARSER cache_config[] = {
 927         { "enable", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, session_cache_enable), "no" },
 928
 929         { "lifetime", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, session_timeout), "24" },
 930         { "name", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, session_id_name), NULL },
 931
 932         { "max_entries", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, session_cache_size), "255" },
 933         { "persist_dir", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, session_cache_path), NULL },
 934         { NULL, -1, 0, NULL, NULL }        /* end the list */
 935 };
 936
 937 static CONF_PARSER verify_config[] = {
 938         { "tmpdir", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, verify_tmp_dir), NULL },
 939         { "client", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, verify_client_cert_cmd), NULL },
 940         { NULL, -1, 0, NULL, NULL }        /* end the list */
 941 };
 942
 943 #ifdef HAVE_OPENSSL_OCSP_H
 944 static CONF_PARSER ocsp_config[] = {
 945         { "enable", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_enable), "no" },
 946         { "override_cert_url", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_override_url), "no" },
 947         { "url", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, ocsp_url), NULL },
 948         { "use_nonce", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_use_nonce), "yes" },
 949         { "timeout", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, ocsp_timeout), "yes" },
 950         { "softfail", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_softfail), "no" },
 951         { NULL, -1, 0, NULL, NULL }        /* end the list */
 952 };
 953 #endif
 954
 955 static CONF_PARSER tls_server_config[] = {
 956         { "rsa_key_exchange", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, rsa_key), "no" },
 957         { "dh_key_exchange", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, dh_key), "yes" },
 958         { "rsa_key_length", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, rsa_key_length), "512" },
 959         { "dh_key_length", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, dh_key_length), "512" },
 960         { "verify_depth", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, verify_depth), "0" },
 961         { "CA_path", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT | PW_TYPE_DEPRECATED, fr_tls_server_conf_t, ca_path), NULL },
 962         { "ca_path", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_path), NULL },
 963         { "pem_file_type", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, file_type), "yes" },
 964         { "private_key_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, private_key_file), NULL },
 965         { "certificate_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, certificate_file), NULL },
 966         { "CA_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT | PW_TYPE_DEPRECATED, fr_tls_server_conf_t, ca_file), NULL },
 967         { "ca_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_file), NULL },
 968         { "private_key_password", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_SECRET, fr_tls_server_conf_t, private_key_password), NULL },
 969 #ifdef PSK_MAX_IDENTITY_LEN
 970         { "psk_identity", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, psk_identity), NULL },
 971         { "psk_hexphrase", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_SECRET, fr_tls_server_conf_t, psk_password), NULL },
 972         { "psk_query", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, psk_query), NULL },
 973 #endif
 974         { "dh_file", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, dh_file), NULL },
 975         { "random_file", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, random_file), NULL },
 976         { "fragment_size", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, fragment_size), "1024" },
 977         { "include_length", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, include_length), "yes" },
 978         { "check_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, check_crl), "no" },
 979         { "allow_expired_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, allow_expired_crl), NULL },
 980         { "check_cert_cn", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_cn), NULL },
 981         { "cipher_list", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, cipher_list), NULL },
 982         { "check_cert_issuer", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_issuer), NULL },
 983         { "require_client_cert", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, require_client_cert), NULL },
 984
 985 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
 986 #ifndef OPENSSL_NO_ECDH
 987         { "ecdh_curve", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, ecdh_curve), "prime256v1" },
 988 #endif
 989 #endif
 990
 991 #ifdef SSL_OP_NO_TLSv1_1
 992         { "disable_tlsv1_1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_1), NULL },
 993 #endif
 994
 995         /*
 996          * @fixme Disabled because using TLS1.2 seems to cause MPPE key issues with eapol_test
 997          * need to fix FreeRADIUS or wpa_supplicant.
 998          */
 999 #ifdef SSL_OP_NO_TLSv1_2
1000         { "disable_tlsv1_2", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_2), "yes" },
1001 #endif
1002
1003         { "cache", FR_CONF_POINTER(PW_TYPE_SUBSECTION, NULL), (void const *) cache_config },
1004
1005         { "verify", FR_CONF_POINTER(PW_TYPE_SUBSECTION, NULL), (void const *) verify_config },
1006
1007 #ifdef HAVE_OPENSSL_OCSP_H
1008         { "ocsp", FR_CONF_POINTER(PW_TYPE_SUBSECTION, NULL), (void const *) ocsp_config },
1009 #endif
1010
1011         { NULL, -1, 0, NULL, NULL }        /* end the list */
1012 };
1013
1014
1015 static CONF_PARSER tls_client_config[] = {
1016         { "rsa_key_exchange", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, rsa_key), "no" },
1017         { "dh_key_exchange", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, dh_key), "yes" },
1018         { "rsa_key_length", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, rsa_key_length), "512" },
1019         { "dh_key_length", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, dh_key_length), "512" },
1020         { "verify_depth", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, verify_depth), "0" },
1021         { "ca_path", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_path), NULL },
1022         { "pem_file_type", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, file_type), "yes" },
1023         { "private_key_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, private_key_file), NULL },
1024         { "certificate_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, certificate_file), NULL },
1025         { "ca_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_file), NULL },
1026         { "private_key_password", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_SECRET, fr_tls_server_conf_t, private_key_password), NULL },
1027         { "dh_file", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, dh_file), NULL },
1028         { "random_file", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, random_file), NULL },
1029         { "fragment_size", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, fragment_size), "1024" },
1030         { "include_length", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, include_length), "yes" },
1031         { "check_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, check_crl), "no" },
1032         { "check_cert_cn", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_cn), NULL },
1033         { "cipher_list", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, cipher_list), NULL },
1034         { "check_cert_issuer", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_issuer), NULL },
1035
1036 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
1037 #ifndef OPENSSL_NO_ECDH
1038         { "ecdh_curve", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, ecdh_curve), "prime256v1" },
1039 #endif
1040 #endif
1041
1042 #ifdef SSL_OP_NO_TLSv1_1
1043         { "disable_tlsv1_1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_1), NULL },
1044 #endif
1045 #ifdef SSL_OP_NO_TLSv1_2
1046         { "disable_tlsv1_2", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_2), NULL },
1047 #endif
1048
1049         { NULL, -1, 0, NULL, NULL }        /* end the list */
1050 };
1051
1052
1053 /*
1054  *      TODO: Check for the type of key exchange * like conf->dh_key
1055  */
1056 static int load_dh_params(SSL_CTX *ctx, char *file)
1057 {
1058         DH *dh = NULL;
1059         BIO *bio;
1060
1061         if (!file) return 0;
1062
1063         if ((bio = BIO_new_file(file, "r")) == NULL) {
1064                 ERROR("tls: Unable to open DH file - %s", file);
1065                 return -1;
1066         }
1067
1068         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
1069         BIO_free(bio);
1070         if (!dh) {
1071                 WARN("tls: Unable to set DH parameters.  DH cipher suites may not work!");
1072                 WARN("Fix this by running the OpenSSL command listed in eap.conf");
1073                 return 0;
1074         }
1075
1076         if (SSL_CTX_set_tmp_dh(ctx, dh) < 0) {
1077                 ERROR("tls: Unable to set DH parameters");
1078                 DH_free(dh);
1079                 return -1;
1080         }
1081
1082         DH_free(dh);
1083         return 0;
1084 }
1085
1086
1087 /*
1088  *      Print debugging messages, and free data.
1089  *
1090  *      FIXME: Write sessions to some long-term storage, so that
1091  *             session resumption can still occur after the server
1092  *             restarts.
1093  */
1094 #define MAX_SESSION_SIZE (256)
1095
1096 static void cbtls_remove_session(SSL_CTX *ctx, SSL_SESSION *sess)
1097 {
1098         size_t size;
1099         char buffer[2 * MAX_SESSION_SIZE + 1];
1100         fr_tls_server_conf_t *conf;
1101
1102         size = sess->session_id_length;
1103         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
1104
1105         fr_bin2hex(buffer, sess->session_id, size);
1106
1107         DEBUG2("  SSL: Removing session %s from the cache", buffer);
1108         conf = (fr_tls_server_conf_t *)SSL_CTX_get_app_data(ctx);
1109         if (conf && conf->session_cache_path) {
1110                 int rv;
1111                 char filename[256];
1112
1113                 /* remove session and any cached VPs */
1114                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
1115                          conf->session_cache_path, FR_DIR_SEP, buffer);
1116                 rv = unlink(filename);
1117                 if (rv != 0) {
1118                         DEBUG2("  SSL: could not remove persisted session file %s: %s", filename, fr_syserror(errno));
1119                 }
1120                 /* VPs might be absent; might not have been written to disk yet */
1121                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
1122                          conf->session_cache_path, FR_DIR_SEP, buffer);
1123                 unlink(filename);
1124         }
1125
1126         return;
1127 }
1128
1129 static int cbtls_new_session(SSL *ssl, SSL_SESSION *sess)
1130 {
1131         size_t size;
1132         char buffer[2 * MAX_SESSION_SIZE + 1];
1133         fr_tls_server_conf_t *conf;
1134         unsigned char *sess_blob = NULL;
1135
1136         size = sess->session_id_length;
1137         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
1138
1139         fr_bin2hex(buffer, sess->session_id, size);
1140
1141         DEBUG2("  SSL: adding session %s to cache", buffer);
1142
1143         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1144         if (conf && conf->session_cache_path) {
1145                 int fd, rv, todo, blob_len;
1146                 char filename[256];
1147                 unsigned char *p;
1148
1149                 /* find out what length data we need */
1150                 blob_len = i2d_SSL_SESSION(sess, NULL);
1151                 if (blob_len < 1) {
1152                         /* something went wrong */
1153                         DEBUG2("  SSL: could not find buffer length to persist session");
1154                         return 0;
1155                 }
1156
1157
1158                 /* Do not convert to TALLOC - Thread safety */
1159                 /* alloc and convert to ASN.1 */
1160                 sess_blob = malloc(blob_len);
1161                 if (!sess_blob) {
1162                         DEBUG2("  SSL: could not allocate buffer len=%d to persist session", blob_len);
1163                         return 0;
1164                 }
1165                 /* openssl mutates &p */
1166                 p = sess_blob;
1167                 rv = i2d_SSL_SESSION(sess, &p);
1168                 if (rv != blob_len) {
1169                         DEBUG2("  SSL: could not persist session");
1170                         goto error;
1171                 }
1172
1173                 /* open output file */
1174                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
1175                          conf->session_cache_path, FR_DIR_SEP, buffer);
1176                 fd = open(filename, O_RDWR|O_CREAT|O_EXCL, 0600);
1177                 if (fd < 0) {
1178                         DEBUG2("  SSL: could not open session file %s: %s", filename, fr_syserror(errno));
1179                         goto error;
1180                 }
1181
1182                 todo = blob_len;
1183                 p = sess_blob;
1184                 while (todo > 0) {
1185                         rv = write(fd, p, todo);
1186                         if (rv < 1) {
1187                                 DEBUG2("  SSL: failed writing session: %s", fr_syserror(errno));
1188                                 close(fd);
1189                                 goto error;
1190                         }
1191                         p += rv;
1192                         todo -= rv;
1193                 }
1194                 close(fd);
1195                 DEBUG2("  SSL: wrote session %s to %s len=%d", buffer, filename, blob_len);
1196         }
1197
1198 error:
1199         free(sess_blob);
1200
1201         return 0;
1202 }
1203
1204 static SSL_SESSION *cbtls_get_session(SSL *ssl,
1205                                       unsigned char *data, int len,
1206                                       int *copy)
1207 {
1208         size_t size;
1209         char buffer[2 * MAX_SESSION_SIZE + 1];
1210         fr_tls_server_conf_t *conf;
1211         TALLOC_CTX *talloc_ctx;
1212
1213         SSL_SESSION *sess = NULL;
1214         unsigned char *sess_data = NULL;
1215         PAIR_LIST *pairlist = NULL;
1216
1217         size = len;
1218         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
1219
1220         fr_bin2hex(buffer, data, size);
1221
1222         DEBUG2("  SSL: Client requested cached session %s", buffer);
1223
1224         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1225         talloc_ctx = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_TALLOC);
1226         if (conf && conf->session_cache_path) {
1227                 int rv, fd, todo;
1228                 char filename[256];
1229                 unsigned char *p;
1230                 struct stat st;
1231                 VALUE_PAIR *vp;
1232
1233                 /* read in the cached VPs from the .vps file */
1234                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
1235                          conf->session_cache_path, FR_DIR_SEP, buffer);
1236                 rv = pairlist_read(NULL, filename, &pairlist, 1);
1237                 if (rv < 0) {
1238                         /* not safe to un-persist a session w/o VPs */
1239                         DEBUG2("  SSL: could not load persisted VPs for session %s", buffer);
1240                         goto err;
1241                 }
1242
1243                 /* load the actual SSL session */
1244                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
1245                          conf->session_cache_path, FR_DIR_SEP, buffer);
1246                 fd = open(filename, O_RDONLY);
1247                 if (fd < 0) {
1248                         DEBUG2("  SSL: could not find persisted session file %s: %s", filename, fr_syserror(errno));
1249                         goto err;
1250                 }
1251
1252                 rv = fstat(fd, &st);
1253                 if (rv < 0) {
1254                         DEBUG2("  SSL: could not stat persisted session file %s: %s", filename, fr_syserror(errno));
1255                         close(fd);
1256                         goto err;
1257                 }
1258
1259                 sess_data = talloc_array(NULL, unsigned char, st.st_size);
1260                 if (!sess_data) {
1261                   DEBUG2("  SSL: could not alloc buffer for persisted session len=%d", (int) st.st_size);
1262                         close(fd);
1263                         goto err;
1264                 }
1265
1266                 p = sess_data;
1267                 todo = st.st_size;
1268                 while (todo > 0) {
1269                         rv = read(fd, p, todo);
1270                         if (rv < 1) {
1271                                 DEBUG2("  SSL: could not read from persisted session: %s", fr_syserror(errno));
1272                                 close(fd);
1273                                 goto err;
1274                         }
1275                         todo -= rv;
1276                         p += rv;
1277                 }
1278                 close(fd);
1279
1280                 /* openssl mutates &p */
1281                 p = sess_data;
1282                 sess = d2i_SSL_SESSION(NULL, (unsigned char const **)(void **) &p, st.st_size);
1283
1284                 if (!sess) {
1285                         DEBUG2("  SSL: OpenSSL failed to load persisted session: %s", ERR_error_string(ERR_get_error(), NULL));
1286                         goto err;
1287                 }
1288
1289                 /* cache the VPs into the session */
1290                 vp = paircopy(talloc_ctx, pairlist->reply);
1291                 SSL_SESSION_set_ex_data(sess, fr_tls_ex_index_vps, vp);
1292                 DEBUG2("  SSL: Successfully restored session %s", buffer);
1293         }
1294 err:
1295         if (sess_data) talloc_free(sess_data);
1296         if (pairlist) pairlist_free(&pairlist);
1297
1298         *copy = 0;
1299         return sess;
1300 }
1301
1302 #ifdef HAVE_OPENSSL_OCSP_H
1303 /*
1304  * This function extracts the OCSP Responder URL
1305  * from an existing x509 certificate.
1306  */
1307 static int ocsp_parse_cert_url(X509 *cert, char **phost, char **pport,
1308                                char **ppath, int *pssl)
1309 {
1310         int i;
1311
1312         AUTHORITY_INFO_ACCESS *aia;
1313         ACCESS_DESCRIPTION *ad;
1314
1315         aia = X509_get_ext_d2i(cert, NID_info_access, NULL, NULL);
1316
1317         for (i = 0; i < sk_ACCESS_DESCRIPTION_num(aia); i++) {
1318                 ad = sk_ACCESS_DESCRIPTION_value(aia, i);
1319                 if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) {
1320                         if (ad->location->type == GEN_URI) {
1321                           if(OCSP_parse_url((char *) ad->location->d.ia5->data,
1322                                                   phost, pport, ppath, pssl))
1323                                         return 1;
1324                         }
1325                 }
1326         }
1327         return 0;
1328 }
1329
1330 /*
1331  * This function sends a OCSP request to a defined OCSP responder
1332  * and checks the OCSP response for correctness.
1333  */
1334
1335 /* Maximum leeway in validity period: default 5 minutes */
1336 #define MAX_VALIDITY_PERIOD     (5 * 60)
1337
1338 static int ocsp_check(X509_STORE *store, X509 *issuer_cert, X509 *client_cert,
1339                       fr_tls_server_conf_t *conf)
1340 {
1341         OCSP_CERTID *certid;
1342         OCSP_REQUEST *req;
1343         OCSP_RESPONSE *resp = NULL;
1344         OCSP_BASICRESP *bresp = NULL;
1345         char *host = NULL;
1346         char *port = NULL;
1347         char *path = NULL;
1348         char hostheader[1024];
1349         int use_ssl = -1;
1350         long nsec = MAX_VALIDITY_PERIOD, maxage = -1;
1351         BIO *cbio, *bio_out;
1352         int ocsp_ok = 0;
1353         int status ;
1354         ASN1_GENERALIZEDTIME *rev, *thisupd, *nextupd;
1355         int reason;
1356 #if OPENSSL_VERSION_NUMBER >= 0x1000003f
1357         OCSP_REQ_CTX *ctx;
1358         int rc;
1359         struct timeval now;
1360         struct timeval when;
1361 #endif
1362
1363         /*
1364          * Create OCSP Request
1365          */
1366         certid = OCSP_cert_to_id(NULL, client_cert, issuer_cert);
1367         req = OCSP_REQUEST_new();
1368         OCSP_request_add0_id(req, certid);
1369         if(conf->ocsp_use_nonce) {
1370                 OCSP_request_add1_nonce(req, NULL, 8);
1371         }
1372
1373         /*
1374          * Send OCSP Request and get OCSP Response
1375          */
1376
1377         /* Get OCSP responder URL */
1378         if (conf->ocsp_override_url) {
1379                 char *url;
1380
1381                 memcpy(&url, &conf->ocsp_url, sizeof(url));
1382                 /* Reading the libssl src, they do a strdup on the URL, so it could of been const *sigh* */
1383                 OCSP_parse_url(url, &host, &port, &path, &use_ssl);
1384         }
1385         else {
1386                 ocsp_parse_cert_url(client_cert, &host, &port, &path, &use_ssl);
1387         }
1388
1389         if (!host || !port || !path) {
1390                 DEBUG2("[ocsp] - Host / port / path missing.  Not doing OCSP");
1391                 ocsp_ok = 2;
1392                 goto ocsp_skip;
1393         }
1394
1395         DEBUG2("[ocsp] --> Responder URL = http://%s:%s%s", host, port, path);
1396
1397         /* Check host and port length are sane, then create Host: HTTP header */
1398         if ((strlen(host) + strlen(port) + 2) > sizeof(hostheader)) {
1399                 ERROR("OCSP Host and port too long");
1400                 goto ocsp_skip;
1401         }
1402         snprintf(hostheader, sizeof(hostheader), "%s:%s", host, port);
1403
1404         /* Setup BIO socket to OCSP responder */
1405         cbio = BIO_new_connect(host);
1406
1407         bio_out = NULL;
1408         if (debug_flag) {
1409                 if (default_log.dst == L_DST_STDOUT) {
1410                         bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
1411                 } else if (default_log.dst == L_DST_STDERR) {
1412                         bio_out = BIO_new_fp(stderr, BIO_NOCLOSE);
1413                 }
1414         }
1415
1416         BIO_set_conn_port(cbio, port);
1417 #if OPENSSL_VERSION_NUMBER < 0x1000003f
1418         BIO_do_connect(cbio);
1419
1420         /* Send OCSP request and wait for response */
1421         resp = OCSP_sendreq_bio(cbio, path, req);
1422         if (!resp) {
1423                 ERROR("Couldn't get OCSP response");
1424                 ocsp_ok = 2;
1425                 goto ocsp_end;
1426         }
1427 #else
1428         if (conf->ocsp_timeout)
1429                 BIO_set_nbio(cbio, 1);
1430
1431         rc = BIO_do_connect(cbio);
1432         if ((rc <= 0) && ((!conf->ocsp_timeout) || !BIO_should_retry(cbio))) {
1433                 ERROR("Couldn't connect to OCSP responder");
1434                 ocsp_ok = 2;
1435                 goto ocsp_end;
1436         }
1437
1438         ctx = OCSP_sendreq_new(cbio, path, NULL, -1);
1439         if (!ctx) {
1440                 ERROR("Couldn't create OCSP request");
1441                 ocsp_ok = 2;
1442                 goto ocsp_end;
1443         }
1444
1445         if (!OCSP_REQ_CTX_add1_header(ctx, "Host", hostheader)) {
1446                 ERROR("Couldn't set Host header");
1447                 ocsp_ok = 2;
1448                 goto ocsp_end;
1449         }
1450
1451         if (!OCSP_REQ_CTX_set1_req(ctx, req)) {
1452                 ERROR("Couldn't add data to OCSP request");
1453                 ocsp_ok = 2;
1454                 goto ocsp_end;
1455         }
1456
1457         gettimeofday(&when, NULL);
1458         when.tv_sec += conf->ocsp_timeout;
1459
1460         do {
1461                 rc = OCSP_sendreq_nbio(&resp, ctx);
1462                 if (conf->ocsp_timeout) {
1463                         gettimeofday(&now, NULL);
1464                         if (!timercmp(&now, &when, <))
1465                                 break;
1466                 }
1467         } while ((rc == -1) && BIO_should_retry(cbio));
1468
1469         if (conf->ocsp_timeout && (rc == -1) && BIO_should_retry(cbio)) {
1470                 ERROR("OCSP response timed out");
1471                 ocsp_ok = 2;
1472                 goto ocsp_end;
1473         }
1474
1475         OCSP_REQ_CTX_free(ctx);
1476
1477         if (rc == 0) {
1478                 ERROR("Couldn't get OCSP response");
1479                 ocsp_ok = 2;
1480                 goto ocsp_end;
1481         }
1482 #endif
1483
1484         /* Verify OCSP response status */
1485         status = OCSP_response_status(resp);
1486         DEBUG2("[ocsp] --> Response status: %s",OCSP_response_status_str(status));
1487         if(status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
1488                 ERROR("OCSP response status: %s", OCSP_response_status_str(status));
1489                 goto ocsp_end;
1490         }
1491         bresp = OCSP_response_get1_basic(resp);
1492         if(conf->ocsp_use_nonce && OCSP_check_nonce(req, bresp)!=1) {
1493                 ERROR("OCSP response has wrong nonce value");
1494                 goto ocsp_end;
1495         }
1496         if(OCSP_basic_verify(bresp, NULL, store, 0)!=1){
1497                 ERROR("Couldn't verify OCSP basic response");
1498                 goto ocsp_end;
1499         }
1500
1501         /*      Verify OCSP cert status */
1502         if(!OCSP_resp_find_status(bresp, certid, &status, &reason,
1503                                                       &rev, &thisupd, &nextupd)) {
1504                 ERROR("No Status found.\n");
1505                 goto ocsp_end;
1506         }
1507
1508         if (!OCSP_check_validity(thisupd, nextupd, nsec, maxage)) {
1509                 if (bio_out) {
1510                         BIO_puts(bio_out, "WARNING: Status times invalid.\n");
1511                         ERR_print_errors(bio_out);
1512                 }
1513                 goto ocsp_end;
1514         }
1515
1516
1517         if (bio_out) {
1518                 BIO_puts(bio_out, "\tThis Update: ");
1519                 ASN1_GENERALIZEDTIME_print(bio_out, thisupd);
1520                 BIO_puts(bio_out, "\n");
1521                 if (nextupd) {
1522                         BIO_puts(bio_out, "\tNext Update: ");
1523                         ASN1_GENERALIZEDTIME_print(bio_out, nextupd);
1524                         BIO_puts(bio_out, "\n");
1525                 }
1526         }
1527
1528         switch (status) {
1529         case V_OCSP_CERTSTATUS_GOOD:
1530                 DEBUG2("[oscp] --> Cert status: good");
1531                 ocsp_ok = 1;
1532                 break;
1533
1534         default:
1535                 /* REVOKED / UNKNOWN */
1536                 DEBUG2("[ocsp] --> Cert status: %s",OCSP_cert_status_str(status));
1537                 if (reason != -1)
1538                         DEBUG2("[ocsp] --> Reason: %s", OCSP_crl_reason_str(reason));
1539
1540                 if (bio_out) {
1541                         BIO_puts(bio_out, "\tRevocation Time: ");
1542                         ASN1_GENERALIZEDTIME_print(bio_out, rev);
1543                         BIO_puts(bio_out, "\n");
1544                 }
1545                 break;
1546         }
1547
1548 ocsp_end:
1549         /* Free OCSP Stuff */
1550         OCSP_REQUEST_free(req);
1551         OCSP_RESPONSE_free(resp);
1552         free(host);
1553         free(port);
1554         free(path);
1555         BIO_free_all(cbio);
1556         if (bio_out) BIO_free(bio_out);
1557         OCSP_BASICRESP_free(bresp);
1558
1559  ocsp_skip:
1560         switch (ocsp_ok) {
1561         case 1:
1562                 DEBUG2("[ocsp] --> Certificate is valid!");
1563                 break;
1564         case 2:
1565                 if (conf->ocsp_softfail) {
1566                         DEBUG2("[ocsp] --> Unable to check certificate; assuming valid");
1567                         DEBUG2("[ocsp] --> Warning! This may be insecure");
1568                         ocsp_ok = 1;
1569                 } else {
1570                         DEBUG2("[ocsp] --> Unable to check certificate; failing!");
1571                         ocsp_ok = 0;
1572                 }
1573                 break;
1574         default:
1575                 DEBUG2("[ocsp] --> Certificate has been expired/revoked!");
1576                 break;
1577         }
1578
1579         return ocsp_ok;
1580 }
1581 #endif  /* HAVE_OPENSSL_OCSP_H */
1582
1583 /*
1584  *      For creating certificate attributes.
1585  */
1586 static char const *cert_attr_names[8][2] = {
1587   { "TLS-Client-Cert-Serial",           "TLS-Cert-Serial" },
1588   { "TLS-Client-Cert-Expiration",       "TLS-Cert-Expiration" },
1589   { "TLS-Client-Cert-Subject",          "TLS-Cert-Subject" },
1590   { "TLS-Client-Cert-Issuer",           "TLS-Cert-Issuer" },
1591   { "TLS-Client-Cert-Common-Name",      "TLS-Cert-Common-Name" },
1592   { "TLS-Client-Cert-Subject-Alt-Name-Email",   "TLS-Cert-Subject-Alt-Name-Email" },
1593   { "TLS-Client-Cert-Subject-Alt-Name-Dns",     "TLS-Cert-Subject-Alt-Name-Dns" },
1594   { "TLS-Client-Cert-Subject-Alt-Name-Upn",     "TLS-Cert-Subject-Alt-Name-Upn" }
1595 };
1596
1597 #define FR_TLS_SERIAL           (0)
1598 #define FR_TLS_EXPIRATION       (1)
1599 #define FR_TLS_SUBJECT          (2)
1600 #define FR_TLS_ISSUER           (3)
1601 #define FR_TLS_CN               (4)
1602 #define FR_TLS_SAN_EMAIL        (5)
1603 #define FR_TLS_SAN_DNS          (6)
1604 #define FR_TLS_SAN_UPN          (7)
1605
1606 /*
1607  *      Before trusting a certificate, you must make sure that the
1608  *      certificate is 'valid'. There are several steps that your
1609  *      application can take in determining if a certificate is
1610  *      valid. Commonly used steps are:
1611  *
1612  *      1.Verifying the certificate's signature, and verifying that
1613  *      the certificate has been issued by a trusted Certificate
1614  *      Authority.
1615  *
1616  *      2.Verifying that the certificate is valid for the present date
1617  *      (i.e. it is being presented within its validity dates).
1618  *
1619  *      3.Verifying that the certificate has not been revoked by its
1620  *      issuing Certificate Authority, by checking with respect to a
1621  *      Certificate Revocation List (CRL).
1622  *
1623  *      4.Verifying that the credentials presented by the certificate
1624  *      fulfill additional requirements specific to the application,
1625  *      such as with respect to access control lists or with respect
1626  *      to OCSP (Online Certificate Status Processing).
1627  *
1628  *      NOTE: This callback will be called multiple times based on the
1629  *      depth of the root certificate chain
1630  */
1631 int cbtls_verify(int ok, X509_STORE_CTX *ctx)
1632 {
1633         char subject[1024]; /* Used for the subject name */
1634         char issuer[1024]; /* Used for the issuer name */
1635         char attribute[1024];
1636         char value[1024];
1637         char common_name[1024];
1638         char cn_str[1024];
1639         char buf[64];
1640         X509 *client_cert;
1641         X509_CINF *client_inf;
1642         STACK_OF(X509_EXTENSION) *ext_list;
1643         SSL *ssl;
1644         int err, depth, lookup, loc;
1645         fr_tls_server_conf_t *conf;
1646         int my_ok = ok;
1647         REQUEST *request;
1648         ASN1_INTEGER *sn = NULL;
1649         ASN1_TIME *asn_time = NULL;
1650         VALUE_PAIR **certs;
1651         char **identity;
1652 #ifdef HAVE_OPENSSL_OCSP_H
1653         X509_STORE *ocsp_store = NULL;
1654         X509 *issuer_cert;
1655 #endif
1656         VALUE_PAIR *vp;
1657         TALLOC_CTX *talloc_ctx;
1658
1659         client_cert = X509_STORE_CTX_get_current_cert(ctx);
1660         err = X509_STORE_CTX_get_error(ctx);
1661         depth = X509_STORE_CTX_get_error_depth(ctx);
1662
1663         lookup = depth;
1664
1665         /*
1666          *      Log client/issuing cert.  If there's an error, log
1667          *      issuing cert.
1668          */
1669         if ((lookup > 1) && !my_ok) lookup = 1;
1670
1671         /*
1672          * Retrieve the pointer to the SSL of the connection currently treated
1673          * and the application specific data stored into the SSL object.
1674          */
1675         ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
1676         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1677         if (!conf) return 1;
1678
1679         request = (REQUEST *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
1680         rad_assert(request != NULL);
1681         certs = (VALUE_PAIR **)SSL_get_ex_data(ssl, fr_tls_ex_index_certs);
1682
1683         identity = (char **)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_IDENTITY);
1684 #ifdef HAVE_OPENSSL_OCSP_H
1685         ocsp_store = (X509_STORE *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_STORE);
1686 #endif
1687
1688         talloc_ctx = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_TALLOC);
1689
1690         /*
1691          *      Get the Serial Number
1692          */
1693         buf[0] = '\0';
1694         sn = X509_get_serialNumber(client_cert);
1695
1696         RDEBUG2("TLS Verify adding attributes");
1697         RINDENT();
1698
1699         /*
1700          *      For this next bit, we create the attributes *only* if
1701          *      we're at the client or issuing certificate, AND we
1702          *      have a user identity.  i.e. we don't create the
1703          *      attributes for RadSec connections.
1704          */
1705         if (certs && identity &&
1706             (lookup <= 1) && sn && ((size_t) sn->length < (sizeof(buf) / 2))) {
1707                 char *p = buf;
1708                 int i;
1709
1710                 for (i = 0; i < sn->length; i++) {
1711                         sprintf(p, "%02x", (unsigned int)sn->data[i]);
1712                         p += 2;
1713                 }
1714                 vp = pairmake(talloc_ctx, certs, cert_attr_names[FR_TLS_SERIAL][lookup], buf, T_OP_SET);
1715                 rdebug_pair(L_DBG_LVL_2, request, vp, "&request:");
1716         }
1717
1718
1719         /*
1720          *      Get the Expiration Date
1721          */
1722         buf[0] = '\0';
1723         asn_time = X509_get_notAfter(client_cert);
1724         if (certs && identity && (lookup <= 1) && asn_time &&
1725             (asn_time->length < (int) sizeof(buf))) {
1726                 memcpy(buf, (char*) asn_time->data, asn_time->length);
1727                 buf[asn_time->length] = '\0';
1728                 vp = pairmake(talloc_ctx, certs, cert_attr_names[FR_TLS_EXPIRATION][lookup], buf, T_OP_SET);
1729                 rdebug_pair(L_DBG_LVL_2, request, vp, "&request:");
1730         }
1731
1732         /*
1733          *      Get the Subject & Issuer
1734          */
1735         subject[0] = issuer[0] = '\0';
1736         X509_NAME_oneline(X509_get_subject_name(client_cert), subject,
1737                           sizeof(subject));
1738         subject[sizeof(subject) - 1] = '\0';
1739         if (certs && identity && (lookup <= 1) && subject[0]) {
1740                 vp = pairmake(talloc_ctx, certs, cert_attr_names[FR_TLS_SUBJECT][lookup], subject, T_OP_SET);
1741                 rdebug_pair(L_DBG_LVL_2, request, vp, "&request:");
1742         }
1743
1744         X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), issuer,
1745                           sizeof(issuer));
1746         issuer[sizeof(issuer) - 1] = '\0';
1747         if (certs && identity && (lookup <= 1) && issuer[0]) {
1748                 vp = pairmake(talloc_ctx, certs, cert_attr_names[FR_TLS_ISSUER][lookup], issuer, T_OP_SET);
1749                 rdebug_pair(L_DBG_LVL_2, request, vp, "&request:");
1750         }
1751
1752         /*
1753          *      Get the Common Name, if there is a subject.
1754          */
1755         X509_NAME_get_text_by_NID(X509_get_subject_name(client_cert),
1756                                   NID_commonName, common_name, sizeof(common_name));
1757         common_name[sizeof(common_name) - 1] = '\0';
1758         if (certs && identity && (lookup <= 1) && common_name[0] && subject[0]) {
1759                 vp = pairmake(talloc_ctx, certs, cert_attr_names[FR_TLS_CN][lookup], common_name, T_OP_SET);
1760                 rdebug_pair(L_DBG_LVL_2, request, vp, "&request:");
1761         }
1762
1763         /*
1764          *      Get the RFC822 Subject Alternative Name
1765          */
1766         loc = X509_get_ext_by_NID(client_cert, NID_subject_alt_name, 0);
1767         if (certs && (lookup <= 1) && (loc >= 0)) {
1768                 X509_EXTENSION *ext = NULL;
1769                 GENERAL_NAMES *names = NULL;
1770                 int i;
1771
1772                 if ((ext = X509_get_ext(client_cert, loc)) &&
1773                     (names = X509V3_EXT_d2i(ext))) {
1774                         for (i = 0; i < sk_GENERAL_NAME_num(names); i++) {
1775                                 GENERAL_NAME *name = sk_GENERAL_NAME_value(names, i);
1776
1777                                 switch (name->type) {
1778 #ifdef GEN_EMAIL
1779                                 case GEN_EMAIL:
1780                                         vp = pairmake(talloc_ctx, certs, cert_attr_names[FR_TLS_SAN_EMAIL][lookup],
1781                                                       (char *) ASN1_STRING_data(name->d.rfc822Name), T_OP_SET);
1782                                         rdebug_pair(L_DBG_LVL_2, request, vp, "&request:");
1783                                         break;
1784 #endif  /* GEN_EMAIL */
1785 #ifdef GEN_DNS
1786                                 case GEN_DNS:
1787                                         vp = pairmake(talloc_ctx, certs, cert_attr_names[FR_TLS_SAN_DNS][lookup],
1788                                                       (char *) ASN1_STRING_data(name->d.dNSName), T_OP_SET);
1789                                         rdebug_pair(L_DBG_LVL_2, request, vp, "&request:");
1790                                         break;
1791 #endif  /* GEN_DNS */
1792 #ifdef GEN_OTHERNAME
1793                                 case GEN_OTHERNAME:
1794                                         /* look for a MS UPN */
1795                                         if (NID_ms_upn == OBJ_obj2nid(name->d.otherName->type_id)) {
1796                                             /* we've got a UPN - Must be ASN1-encoded UTF8 string */
1797                                             if (name->d.otherName->value->type == V_ASN1_UTF8STRING) {
1798                                                     vp = pairmake(talloc_ctx, certs, cert_attr_names[FR_TLS_SAN_UPN][lookup],
1799                                                                   (char *) ASN1_STRING_data(name->d.otherName->value->value.utf8string), T_OP_SET);
1800                                                     rdebug_pair(L_DBG_LVL_2, request, vp, "&request:");
1801                                                 break;
1802                                             } else {
1803                                                 RWARN("Invalid UPN in Subject Alt Name (should be UTF-8)");
1804                                                 break;
1805                                             }
1806                                         }
1807                                         break;
1808 #endif  /* GEN_OTHERNAME */
1809                                 default:
1810                                         /* XXX TODO handle other SAN types */
1811                                         break;
1812                                 }
1813                         }
1814                 }
1815                 if (names != NULL)
1816                         sk_GENERAL_NAME_free(names);
1817         }
1818
1819         /*
1820          *      If the CRL has expired, that might still be OK.
1821          */
1822         if (!my_ok &&
1823             (conf->allow_expired_crl) &&
1824             (err == X509_V_ERR_CRL_HAS_EXPIRED)) {
1825                 my_ok = 1;
1826                 X509_STORE_CTX_set_error( ctx, 0 );
1827         }
1828
1829         if (!my_ok) {
1830                 char const *p = X509_verify_cert_error_string(err);
1831                 RERROR("SSL says error %d : %s", err, p);
1832                 REXDENT();
1833                 return my_ok;
1834         }
1835
1836         if (lookup == 0) {
1837                 client_inf = client_cert->cert_info;
1838                 ext_list = client_inf->extensions;
1839         } else {
1840                 ext_list = NULL;
1841         }
1842
1843         /*
1844          *      Grab the X509 extensions, and create attributes out of them.
1845          *      For laziness, we re-use the OpenSSL names
1846          */
1847         if (sk_X509_EXTENSION_num(ext_list) > 0) {
1848                 int i, len;
1849                 char *p;
1850                 BIO *out;
1851
1852                 out = BIO_new(BIO_s_mem());
1853                 strlcpy(attribute, "TLS-Client-Cert-", sizeof(attribute));
1854
1855                 for (i = 0; i < sk_X509_EXTENSION_num(ext_list); i++) {
1856                         ASN1_OBJECT *obj;
1857                         X509_EXTENSION *ext;
1858
1859                         ext = sk_X509_EXTENSION_value(ext_list, i);
1860
1861                         obj = X509_EXTENSION_get_object(ext);
1862                         i2a_ASN1_OBJECT(out, obj);
1863                         len = BIO_read(out, attribute + 16 , sizeof(attribute) - 16 - 1);
1864                         if (len <= 0) continue;
1865
1866                         attribute[16 + len] = '\0';
1867
1868                         X509V3_EXT_print(out, ext, 0, 0);
1869                         len = BIO_read(out, value , sizeof(value) - 1);
1870                         if (len <= 0) continue;
1871
1872                         value[len] = '\0';
1873
1874                         /*
1875                          *      Mash the OpenSSL name to our name, and
1876                          *      create the attribute.
1877                          */
1878                         for (p = value + 16; *p != '\0'; p++) {
1879                                 if (*p == ' ') *p = '-';
1880                         }
1881
1882                         vp = pairmake(talloc_ctx, certs, attribute, value, T_OP_ADD);
1883                         if (!vp) {
1884                                 RDEBUG3("Skipping %s += '%s'.  Define %s in the server dictionary "
1885                                         "if you require this attribute", attribute, value, attribute);
1886                         } else {
1887                                 rdebug_pair_list(L_DBG_LVL_2, request, vp, NULL);
1888                         }
1889                 }
1890
1891                 BIO_free_all(out);
1892         }
1893
1894         REXDENT();
1895
1896         switch (ctx->error) {
1897         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
1898                 RERROR("issuer=%s", issuer);
1899                 break;
1900
1901         case X509_V_ERR_CERT_NOT_YET_VALID:
1902         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
1903                 RERROR("notBefore=");
1904 #if 0
1905                 ASN1_TIME_print(bio_err, X509_get_notBefore(ctx->current_cert));
1906 #endif
1907                 break;
1908
1909         case X509_V_ERR_CERT_HAS_EXPIRED:
1910         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
1911                 RERROR("notAfter=");
1912 #if 0
1913                 ASN1_TIME_print(bio_err, X509_get_notAfter(ctx->current_cert));
1914 #endif
1915                 break;
1916         }
1917
1918         /*
1919          *      If we're at the actual client cert, apply additional
1920          *      checks.
1921          */
1922         if (depth == 0) {
1923                 /*
1924                  *      If the conf tells us to, check cert issuer
1925                  *      against the specified value and fail
1926                  *      verification if they don't match.
1927                  */
1928                 if (conf->check_cert_issuer &&
1929                     (strcmp(issuer, conf->check_cert_issuer) != 0)) {
1930                         AUTH("tls: Certificate issuer (%s) does not match specified value (%s)!", issuer, conf->check_cert_issuer);
1931                         my_ok = 0;
1932                 }
1933
1934                 /*
1935                  *      If the conf tells us to, check the CN in the
1936                  *      cert against xlat'ed value, but only if the
1937                  *      previous checks passed.
1938                  */
1939                 if (my_ok && conf->check_cert_cn) {
1940                         if (radius_xlat(cn_str, sizeof(cn_str), request, conf->check_cert_cn, NULL, NULL) < 0) {
1941                                 /* if this fails, fail the verification */
1942                                 my_ok = 0;
1943                         } else {
1944                                 RDEBUG2("checking certificate CN (%s) with xlat'ed value (%s)", common_name, cn_str);
1945                                 if (strcmp(cn_str, common_name) != 0) {
1946                                         AUTH("tls: Certificate CN (%s) does not match specified value (%s)!", common_name, cn_str);
1947                                         my_ok = 0;
1948                                 }
1949                         }
1950                 } /* check_cert_cn */
1951
1952 #ifdef HAVE_OPENSSL_OCSP_H
1953                 if (my_ok && conf->ocsp_enable){
1954                         RDEBUG2("--> Starting OCSP Request");
1955                         if (X509_STORE_CTX_get1_issuer(&issuer_cert, ctx, client_cert) != 1) {
1956                                 RERROR("Couldn't get issuer_cert for %s", common_name);
1957                         } else {
1958                                 my_ok = ocsp_check(ocsp_store, issuer_cert, client_cert, conf);
1959                         }
1960                 }
1961 #endif
1962
1963                 while (conf->verify_client_cert_cmd) {
1964                         char filename[256];
1965                         int fd;
1966                         FILE *fp;
1967
1968                         snprintf(filename, sizeof(filename), "%s/%s.client.XXXXXXXX",
1969                                  conf->verify_tmp_dir, progname);
1970                         fd = mkstemp(filename);
1971                         if (fd < 0) {
1972                                 RDEBUG("Failed creating file in %s: %s",
1973                                        conf->verify_tmp_dir, fr_syserror(errno));
1974                                 break;
1975                         }
1976
1977                         fp = fdopen(fd, "w");
1978                         if (!fp) {
1979                                 close(fd);
1980                                 RDEBUG("Failed opening file %s: %s",
1981                                        filename, fr_syserror(errno));
1982                                 break;
1983                         }
1984
1985                         if (!PEM_write_X509(fp, client_cert)) {
1986                                 fclose(fp);
1987                                 RDEBUG("Failed writing certificate to file");
1988                                 goto do_unlink;
1989                         }
1990                         fclose(fp);
1991
1992                         if (!pairmake_packet("TLS-Client-Cert-Filename",
1993                                              filename, T_OP_SET)) {
1994                                 RDEBUG("Failed creating TLS-Client-Cert-Filename");
1995
1996                                 goto do_unlink;
1997                         }
1998
1999                         RDEBUG("Verifying client certificate: %s", conf->verify_client_cert_cmd);
2000                         if (radius_exec_program(NULL, 0, NULL, request, conf->verify_client_cert_cmd,
2001                                                 request->packet->vps,
2002                                                 true, true, EXEC_TIMEOUT) != 0) {
2003                                 AUTH("tls: Certificate CN (%s) fails external verification!", common_name);
2004                                 my_ok = 0;
2005                         } else {
2006                                 RDEBUG("Client certificate CN %s passed external validation", common_name);
2007                         }
2008
2009                 do_unlink:
2010                         unlink(filename);
2011                         break;
2012                 }
2013
2014
2015         } /* depth == 0 */
2016
2017         if (debug_flag > 0) {
2018                 RDEBUG2("chain-depth=%d, ", depth);
2019                 RDEBUG2("error=%d", err);
2020
2021                 if (identity) RDEBUG2("--> User-Name = %s", *identity);
2022                 RDEBUG2("--> BUF-Name = %s", common_name);
2023                 RDEBUG2("--> subject = %s", subject);
2024                 RDEBUG2("--> issuer  = %s", issuer);
2025                 RDEBUG2("--> verify return:%d", my_ok);
2026         }
2027         return my_ok;
2028 }
2029
2030
2031 #ifdef HAVE_OPENSSL_OCSP_H
2032 /*
2033  *      Create Global X509 revocation store and use it to verify
2034  *      OCSP responses
2035  *
2036  *      - Load the trusted CAs
2037  *      - Load the trusted issuer certificates
2038  */
2039 static X509_STORE *init_revocation_store(fr_tls_server_conf_t *conf)
2040 {
2041         X509_STORE *store = NULL;
2042
2043         store = X509_STORE_new();
2044
2045         /* Load the CAs we trust */
2046         if (conf->ca_file || conf->ca_path)
2047                 if(!X509_STORE_load_locations(store, conf->ca_file, conf->ca_path)) {
2048                         ERROR("tls: X509_STORE error %s", ERR_error_string(ERR_get_error(), NULL));
2049                         ERROR("tls: Error reading Trusted root CA list %s",conf->ca_file );
2050                         return NULL;
2051                 }
2052
2053 #ifdef X509_V_FLAG_CRL_CHECK
2054         if (conf->check_crl)
2055                 X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK);
2056 #endif
2057         return store;
2058 }
2059 #endif  /* HAVE_OPENSSL_OCSP_H */
2060
2061 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
2062 #ifndef OPENSSL_NO_ECDH
2063 static int set_ecdh_curve(SSL_CTX *ctx, char const *ecdh_curve)
2064 {
2065         int      nid;
2066         EC_KEY  *ecdh;
2067
2068         if (!ecdh_curve || !*ecdh_curve) return 0;
2069
2070         nid = OBJ_sn2nid(ecdh_curve);
2071         if (!nid) {
2072                 ERROR("Unknown ecdh_curve \"%s\"", ecdh_curve);
2073                 return -1;
2074         }
2075
2076         ecdh = EC_KEY_new_by_curve_name(nid);
2077         if (!ecdh) {
2078                 ERROR("Unable to create new curve \"%s\"", ecdh_curve);
2079                 return -1;
2080         }
2081
2082         SSL_CTX_set_tmp_ecdh(ctx, ecdh);
2083
2084         SSL_CTX_set_options(ctx, SSL_OP_SINGLE_ECDH_USE);
2085
2086         EC_KEY_free(ecdh);
2087
2088         return 0;
2089 }
2090 #endif
2091 #endif
2092
2093 /*
2094  * DIE OPENSSL DIE DIE DIE
2095  *
2096  * What a palaver, just to free some data attached the
2097  * session. We need to do this because the "remove" callback
2098  * is called when refcount > 0 sometimes, if another thread
2099  * is using the session
2100  */
2101 static void sess_free_vps(UNUSED void *parent, void *data_ptr,
2102                                 UNUSED CRYPTO_EX_DATA *ad, UNUSED int idx,
2103                                 UNUSED long argl, UNUSED void *argp)
2104 {
2105         VALUE_PAIR *vp = data_ptr;
2106         if (!vp) return;
2107
2108         DEBUG2("  Freeing cached session VPs");
2109
2110         pairfree(&vp);
2111 }
2112
2113 static void sess_free_certs(UNUSED void *parent, void *data_ptr,
2114                                 UNUSED CRYPTO_EX_DATA *ad, UNUSED int idx,
2115                                 UNUSED long argl, UNUSED void *argp)
2116 {
2117         VALUE_PAIR **certs = data_ptr;
2118         if (!certs) return;
2119
2120         DEBUG2("  Freeing cached session Certificates");
2121
2122         pairfree(certs);
2123 }
2124
2125 /** Add all the default ciphers and message digests reate our context.
2126  *
2127  * This should be called exactly once from main, before reading the main config
2128  * or initialising any modules.
2129  */
2130 void tls_global_init(void)
2131 {
2132         SSL_load_error_strings();       /* readable error messages (examples show call before library_init) */
2133         SSL_library_init();             /* initialize library */
2134         OpenSSL_add_all_algorithms();   /* required for SHA2 in OpenSSL < 0.9.8o and 1.0.0.a */
2135         OPENSSL_config(NULL);
2136
2137         /*
2138          *      Initialize the index for the certificates.
2139          */
2140         fr_tls_ex_index_certs = SSL_SESSION_get_ex_new_index(0, NULL, NULL, NULL, sess_free_certs);
2141 }
2142
2143 #ifdef ENABLE_OPENSSL_VERSION_CHECK
2144 /** Check for vulnerable versions of libssl
2145  *
2146  * @param acknowledged The highest CVE number a user has confirmed is not present in the system's libssl.
2147  * @return 0 if the CVE specified by the user matches the most recent CVE we have, else -1.
2148  */
2149 int tls_global_version_check(char const *acknowledged)
2150 {
2151         uint64_t v;
2152
2153         if ((strcmp(acknowledged, libssl_defects[0].id) != 0) && (strcmp(acknowledged, "yes") != 0)) {
2154                 bool bad = false;
2155                 size_t i;
2156
2157                 /* Check for bad versions */
2158                 v = (uint64_t) SSLeay();
2159
2160                 for (i = 0; i < (sizeof(libssl_defects) / sizeof(*libssl_defects)); i++) {
2161                         libssl_defect_t *defect = &libssl_defects[i];
2162
2163                         if ((v >= defect->low) && (v <= defect->high)) {
2164                                 ERROR("Refusing to start with libssl version %s (in range %s)",
2165                                       ssl_version(), ssl_version_range(defect->low, defect->high));
2166                                 ERROR("Security advisory %s (%s)", defect->id, defect->name);
2167                                 ERROR("%s", defect->comment);
2168
2169                                 bad = true;
2170                         }
2171                 }
2172
2173                 if (bad) {
2174                         INFO("Once you have verified libssl has been correctly patched, "
2175                              "set security.allow_vulnerable_openssl = '%s'", libssl_defects[0].id);
2176                         return -1;
2177                 }
2178         }
2179
2180         return 0;
2181 }
2182 #endif
2183
2184 /** Free any memory alloced by libssl
2185  *
2186  */
2187 void tls_global_cleanup(void)
2188 {
2189         ERR_remove_state(0);
2190         ENGINE_cleanup();
2191         CONF_modules_unload(1);
2192         ERR_free_strings();
2193         EVP_cleanup();
2194         CRYPTO_cleanup_all_ex_data();
2195 }
2196
2197 /** Create SSL context
2198  *
2199  * - Load the trusted CAs
2200  * - Load the Private key & the certificate
2201  * - Set the Context options & Verify options
2202  */
2203 SSL_CTX *tls_init_ctx(fr_tls_server_conf_t *conf, int client)
2204 {
2205         SSL_CTX *ctx;
2206         X509_STORE *certstore;
2207         int verify_mode = SSL_VERIFY_NONE;
2208         int ctx_options = 0;
2209         int type;
2210
2211         /*
2212          *      SHA256 is in all versions of OpenSSL, but isn't
2213          *      initialized by default.  It's needed for WiMAX
2214          *      certificates.
2215          */
2216 #ifdef HAVE_OPENSSL_EVP_SHA256
2217         EVP_add_digest(EVP_sha256());
2218 #endif
2219
2220         ctx = SSL_CTX_new(SSLv23_method()); /* which is really "all known SSL / TLS methods".  Idiots. */
2221         if (!ctx) {
2222                 int err;
2223                 while ((err = ERR_get_error())) {
2224                         DEBUG("Failed creating SSL context: %s",
2225                               ERR_error_string(err, NULL));
2226                         return NULL;
2227                 }
2228         }
2229
2230         /*
2231          * Save the config on the context so that callbacks which
2232          * only get SSL_CTX* e.g. session persistence, can get it
2233          */
2234         SSL_CTX_set_app_data(ctx, conf);
2235
2236         /*
2237          * Identify the type of certificates that needs to be loaded
2238          */
2239         if (conf->file_type) {
2240                 type = SSL_FILETYPE_PEM;
2241         } else {
2242                 type = SSL_FILETYPE_ASN1;
2243         }
2244
2245         /*
2246          * Set the password to load private key
2247          */
2248         if (conf->private_key_password) {
2249 #ifdef __APPLE__
2250                 /*
2251                  * We don't want to put the private key password in eap.conf, so  check
2252                  * for our special string which indicates we should get the password
2253                  * programmatically.
2254                  */
2255                 char const* special_string = "Apple:UseCertAdmin";
2256                 if (strncmp(conf->private_key_password, special_string, strlen(special_string)) == 0) {
2257                         char cmd[256];
2258                         char *password;
2259                         long const max_password_len = 128;
2260                         snprintf(cmd, sizeof(cmd) - 1, "/usr/sbin/certadmin --get-private-key-passphrase \"%s\"",
2261                                  conf->private_key_file);
2262
2263                         DEBUG2("tls: Getting private key passphrase using command \"%s\"", cmd);
2264
2265                         FILE* cmd_pipe = popen(cmd, "r");
2266                         if (!cmd_pipe) {
2267                                 ERROR("TLS: %s command failed.  Unable to get private_key_password", cmd);
2268                                 ERROR("Error reading private_key_file %s", conf->private_key_file);
2269                                 return NULL;
2270                         }
2271
2272                         rad_const_free(conf->private_key_password);
2273                         password = talloc_array(conf, char, max_password_len);
2274                         if (!password) {
2275                                 ERROR("TLS: Can't allocate space for private_key_password");
2276                                 ERROR("TLS: Error reading private_key_file %s", conf->private_key_file);
2277                                 pclose(cmd_pipe);
2278                                 return NULL;
2279                         }
2280
2281                         fgets(password, max_password_len, cmd_pipe);
2282                         pclose(cmd_pipe);
2283
2284                         /* Get rid of newline at end of password. */
2285                         password[strlen(password) - 1] = '\0';
2286
2287                         DEBUG3("tls:  Password from command = \"%s\"", password);
2288                         conf->private_key_password = password;
2289                 }
2290 #endif
2291
2292                 {
2293                         char *password;
2294
2295                         memcpy(&password, &conf->private_key_password, sizeof(password));
2296                         SSL_CTX_set_default_passwd_cb_userdata(ctx, password);
2297                         SSL_CTX_set_default_passwd_cb(ctx, cbtls_password);
2298                 }
2299         }
2300
2301 #ifdef PSK_MAX_IDENTITY_LEN
2302         if (!client) {
2303                 /*
2304                  *      No dynamic query exists.  There MUST be a
2305                  *      statically configured identity and password.
2306                  */
2307                 if (conf->psk_query && !*conf->psk_query) {
2308                         ERROR("Invalid PSK Configuration: psk_query cannot be empty");
2309                         return NULL;
2310                 }
2311
2312                 /*
2313                  *      Set the callback only if we can check things.
2314                  */
2315                 if (conf->psk_identity || conf->psk_query) {
2316                         SSL_CTX_set_psk_server_callback(ctx, psk_server_callback);
2317                 }
2318
2319         } else if (conf->psk_query) {
2320                 ERROR("Invalid PSK Configuration: psk_query cannot be used for outgoing connections");
2321                 return NULL;
2322         }
2323
2324         /*
2325          *      Now check that if PSK is being used, the config is valid.
2326          */
2327         if ((conf->psk_identity && !conf->psk_password) ||
2328             (!conf->psk_identity && conf->psk_password) ||
2329             (conf->psk_identity && !*conf->psk_identity) ||
2330             (conf->psk_password && !*conf->psk_password)) {
2331                 ERROR("Invalid PSK Configuration: psk_identity or psk_password are empty");
2332                 return NULL;
2333         }
2334
2335         if (conf->psk_identity) {
2336                 size_t psk_len, hex_len;
2337                 uint8_t buffer[PSK_MAX_PSK_LEN];
2338
2339                 if (conf->certificate_file ||
2340                     conf->private_key_password || conf->private_key_file ||
2341                     conf->ca_file || conf->ca_path) {
2342                         ERROR("When PSKs are used, No certificate configuration is permitted");
2343                         return NULL;
2344                 }
2345
2346                 if (client) {
2347                         SSL_CTX_set_psk_client_callback(ctx,
2348                                                         psk_client_callback);
2349                 }
2350
2351                 psk_len = strlen(conf->psk_password);
2352                 if (strlen(conf->psk_password) > (2 * PSK_MAX_PSK_LEN)) {
2353                         ERROR("psk_hexphrase is too long (max %d)",
2354                                PSK_MAX_PSK_LEN);
2355                         return NULL;
2356                 }
2357
2358                 /*
2359                  *      Check the password now, so that we don't have
2360                  *      errors at run-time.
2361                  */
2362                 hex_len = fr_hex2bin(buffer, sizeof(buffer), conf->psk_password, psk_len);
2363                 if (psk_len != (2 * hex_len)) {
2364                         ERROR("psk_hexphrase is not all hex");
2365                         return NULL;
2366                 }
2367
2368                 goto post_ca;
2369         }
2370 #else
2371         (void) client;  /* -Wunused */
2372 #endif
2373
2374         /*
2375          *      Load our keys and certificates
2376          *
2377          *      If certificates are of type PEM then we can make use
2378          *      of cert chain authentication using openssl api call
2379          *      SSL_CTX_use_certificate_chain_file.  Please see how
2380          *      the cert chain needs to be given in PEM from
2381          *      openSSL.org
2382          */
2383         if (!conf->certificate_file) goto load_ca;
2384
2385         if (type == SSL_FILETYPE_PEM) {
2386                 if (!(SSL_CTX_use_certificate_chain_file(ctx, conf->certificate_file))) {
2387                         ERROR("Error reading certificate file %s:%s",
2388                                conf->certificate_file,
2389                                ERR_error_string(ERR_get_error(), NULL));
2390                         return NULL;
2391                 }
2392
2393         } else if (!(SSL_CTX_use_certificate_file(ctx, conf->certificate_file, type))) {
2394                 ERROR("Error reading certificate file %s:%s",
2395                        conf->certificate_file,
2396                        ERR_error_string(ERR_get_error(), NULL));
2397                 return NULL;
2398         }
2399
2400         /* Load the CAs we trust */
2401 load_ca:
2402         if (conf->ca_file || conf->ca_path) {
2403                 if (!SSL_CTX_load_verify_locations(ctx, conf->ca_file, conf->ca_path)) {
2404                         ERROR("tls: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
2405                         ERROR("tls: Error reading Trusted root CA list %s",conf->ca_file );
2406                         return NULL;
2407                 }
2408         }
2409         if (conf->ca_file && *conf->ca_file) SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(conf->ca_file));
2410
2411         if (conf->private_key_file) {
2412                 if (!(SSL_CTX_use_PrivateKey_file(ctx, conf->private_key_file, type))) {
2413                         ERROR("Failed reading private key file %s:%s",
2414                                conf->private_key_file,
2415                                ERR_error_string(ERR_get_error(), NULL));
2416                         return NULL;
2417                 }
2418
2419                 /*
2420                  * Check if the loaded private key is the right one
2421                  */
2422                 if (!SSL_CTX_check_private_key(ctx)) {
2423                         ERROR("Private key does not match the certificate public key");
2424                         return NULL;
2425                 }
2426         }
2427
2428 #ifdef PSK_MAX_IDENTITY_LEN
2429 post_ca:
2430 #endif
2431
2432         /*
2433          *      We never want SSLv2 or SSLv3.
2434          */
2435         ctx_options |= SSL_OP_NO_SSLv2;
2436         ctx_options |= SSL_OP_NO_SSLv3;
2437
2438         /*
2439          *      As of 3.0.5, we always allow TLSv1.1 and TLSv1.2.
2440          *      Though they can be *globally* disabled if necessary.x
2441          */
2442 #ifdef SSL_OP_NO_TLSv1_1
2443         if (conf->disable_tlsv1_1) ctx_options |= SSL_OP_NO_TLSv1_1;
2444 #endif
2445 #ifdef SSL_OP_NO_TLSv1_2
2446         if (conf->disable_tlsv1_2) ctx_options |= SSL_OP_NO_TLSv1_2;
2447 #endif
2448
2449 #ifdef SSL_OP_NO_TICKET
2450         ctx_options |= SSL_OP_NO_TICKET;
2451 #endif
2452
2453         /*
2454          *      SSL_OP_SINGLE_DH_USE must be used in order to prevent
2455          *      small subgroup attacks and forward secrecy. Always
2456          *      using
2457          *
2458          *      SSL_OP_SINGLE_DH_USE has an impact on the computer
2459          *      time needed during negotiation, but it is not very
2460          *      large.
2461          */
2462         ctx_options |= SSL_OP_SINGLE_DH_USE;
2463
2464         /*
2465          *      SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS to work around issues
2466          *      in Windows Vista client.
2467          *      http://www.openssl.org/~bodo/tls-cbc.txt
2468          *      http://www.nabble.com/(RADIATOR)-Radiator-Version-3.16-released-t2600070.html
2469          */
2470         ctx_options |= SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
2471
2472         SSL_CTX_set_options(ctx, ctx_options);
2473
2474         /*
2475          *      TODO: Set the RSA & DH
2476          *      SSL_CTX_set_tmp_rsa_callback(ctx, cbtls_rsa);
2477          *      SSL_CTX_set_tmp_dh_callback(ctx, cbtls_dh);
2478          */
2479
2480         /*
2481          *      set the message callback to identify the type of
2482          *      message.  For every new session, there can be a
2483          *      different callback argument.
2484          *
2485          *      SSL_CTX_set_msg_callback(ctx, cbtls_msg);
2486          */
2487
2488         /*
2489          *      Set eliptical curve crypto configuration.
2490          */
2491 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
2492 #ifndef OPENSSL_NO_ECDH
2493         if (set_ecdh_curve(ctx, conf->ecdh_curve) < 0) {
2494                 return NULL;
2495         }
2496 #endif
2497 #endif
2498
2499         /* Set Info callback */
2500         SSL_CTX_set_info_callback(ctx, cbtls_info);
2501
2502         /*
2503          *      Callbacks, etc. for session resumption.
2504          */
2505         if (conf->session_cache_enable) {
2506                 SSL_CTX_sess_set_new_cb(ctx, cbtls_new_session);
2507                 SSL_CTX_sess_set_get_cb(ctx, cbtls_get_session);
2508                 SSL_CTX_sess_set_remove_cb(ctx, cbtls_remove_session);
2509
2510                 SSL_CTX_set_quiet_shutdown(ctx, 1);
2511                 if (fr_tls_ex_index_vps < 0)
2512                         fr_tls_ex_index_vps = SSL_SESSION_get_ex_new_index(0, NULL, NULL, NULL, sess_free_vps);
2513         }
2514
2515         /*
2516          *      Check the certificates for revocation.
2517          */
2518 #ifdef X509_V_FLAG_CRL_CHECK
2519         if (conf->check_crl) {
2520                 certstore = SSL_CTX_get_cert_store(ctx);
2521                 if (certstore == NULL) {
2522                         ERROR("tls: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
2523                         ERROR("tls: Error reading Certificate Store");
2524                         return NULL;
2525                 }
2526                 X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK);
2527         }
2528 #endif
2529
2530         /*
2531          *      Set verify modes
2532          *      Always verify the peer certificate
2533          */
2534         verify_mode |= SSL_VERIFY_PEER;
2535         verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
2536         verify_mode |= SSL_VERIFY_CLIENT_ONCE;
2537         SSL_CTX_set_verify(ctx, verify_mode, cbtls_verify);
2538
2539         if (conf->verify_depth) {
2540                 SSL_CTX_set_verify_depth(ctx, conf->verify_depth);
2541         }
2542
2543         /* Load randomness */
2544         if (conf->random_file) {
2545                 if (!(RAND_load_file(conf->random_file, 1024*10))) {
2546                         ERROR("tls: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
2547                         ERROR("tls: Error loading randomness");
2548                         return NULL;
2549                 }
2550         }
2551
2552         /*
2553          * Set the cipher list if we were told to
2554          */
2555         if (conf->cipher_list) {
2556                 if (!SSL_CTX_set_cipher_list(ctx, conf->cipher_list)) {
2557                         ERROR("tls: Error setting cipher list");
2558                         return NULL;
2559                 }
2560         }
2561
2562         /*
2563          *      Setup session caching
2564          */
2565         if (conf->session_cache_enable) {
2566                 /*
2567                  *      Create a unique context Id per EAP-TLS configuration.
2568                  */
2569                 if (conf->session_id_name) {
2570                         snprintf(conf->session_context_id, sizeof(conf->session_context_id),
2571                                  "FR eap %s", conf->session_id_name);
2572                 } else {
2573                         snprintf(conf->session_context_id, sizeof(conf->session_context_id),
2574                                  "FR eap %p", conf);
2575                 }
2576
2577                 /*
2578                  *      Cache it, and DON'T auto-clear it.
2579                  */
2580                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_SERVER | SSL_SESS_CACHE_NO_AUTO_CLEAR);
2581
2582                 SSL_CTX_set_session_id_context(ctx,
2583                                                (unsigned char *) conf->session_context_id,
2584                                                (unsigned int) strlen(conf->session_context_id));
2585
2586                 /*
2587                  *      Our timeout is in hours, this is in seconds.
2588                  */
2589                 SSL_CTX_set_timeout(ctx, conf->session_timeout * 3600);
2590
2591                 /*
2592                  *      Set the maximum number of entries in the
2593                  *      session cache.
2594                  */
2595                 SSL_CTX_sess_set_cache_size(ctx, conf->session_cache_size);
2596
2597         } else {
2598                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
2599         }
2600
2601         return ctx;
2602 }
2603
2604
2605 /*
2606  *      Free TLS client/server config
2607  *      Should not be called outside this code, as a callback is
2608  *      added to automatically free the data when the CONF_SECTION
2609  *      is freed.
2610  */
2611 static int _tls_server_conf_free(fr_tls_server_conf_t *conf)
2612 {
2613         if (conf->ctx) SSL_CTX_free(conf->ctx);
2614
2615 #ifdef HAVE_OPENSSL_OCSP_H
2616         if (conf->ocsp_store) X509_STORE_free(conf->ocsp_store);
2617         conf->ocsp_store = NULL;
2618 #endif
2619
2620 #ifndef NDEBUG
2621         memset(conf, 0, sizeof(*conf));
2622 #endif
2623         return 0;
2624 }
2625
2626 static fr_tls_server_conf_t *tls_server_conf_alloc(TALLOC_CTX *ctx)
2627 {
2628         fr_tls_server_conf_t *conf;
2629
2630         conf = talloc_zero(ctx, fr_tls_server_conf_t);
2631         if (!conf) {
2632                 ERROR("Out of memory");
2633                 return NULL;
2634         }
2635
2636         talloc_set_destructor(conf, _tls_server_conf_free);
2637
2638         return conf;
2639 }
2640
2641 fr_tls_server_conf_t *tls_server_conf_parse(CONF_SECTION *cs)
2642 {
2643         fr_tls_server_conf_t *conf;
2644
2645         /*
2646          *      If cs has already been parsed there should be a cached copy
2647          *      of conf already stored, so just return that.
2648          */
2649         conf = cf_data_find(cs, "tls-conf");
2650         if (conf) {
2651                 DEBUG("Using cached TLS configuration from previous invocation");
2652                 return conf;
2653         }
2654
2655         conf = tls_server_conf_alloc(cs);
2656
2657         if (cf_section_parse(cs, conf, tls_server_config) < 0) {
2658         error:
2659                 talloc_free(conf);
2660                 return NULL;
2661         }
2662
2663         /*
2664          *      Save people from their own stupidity.
2665          */
2666         if (conf->fragment_size < 100) conf->fragment_size = 100;
2667
2668         if (!conf->private_key_file) {
2669                 ERROR("TLS Server requires a private key file");
2670                 goto error;
2671         }
2672
2673         if (!conf->certificate_file) {
2674                 ERROR("TLS Server requires a certificate file");
2675                 goto error;
2676         }
2677
2678         /*
2679          *      Initialize TLS
2680          */
2681         conf->ctx = tls_init_ctx(conf, 0);
2682         if (conf->ctx == NULL) {
2683                 goto error;
2684         }
2685
2686 #ifdef HAVE_OPENSSL_OCSP_H
2687         /*
2688          *      Initialize OCSP Revocation Store
2689          */
2690         if (conf->ocsp_enable) {
2691                 conf->ocsp_store = init_revocation_store(conf);
2692                 if (conf->ocsp_store == NULL) goto error;
2693         }
2694 #endif /*HAVE_OPENSSL_OCSP_H*/
2695         {
2696                 char *dh_file;
2697
2698                 memcpy(&dh_file, &conf->dh_file, sizeof(dh_file));
2699                 if (load_dh_params(conf->ctx, dh_file) < 0) {
2700                         goto error;
2701                 }
2702         }
2703
2704         if (conf->verify_tmp_dir) {
2705                 if (chmod(conf->verify_tmp_dir, S_IRWXU) < 0) {
2706                         ERROR("Failed changing permissions on %s: %s", conf->verify_tmp_dir, fr_syserror(errno));
2707                         goto error;
2708                 }
2709         }
2710
2711         if (conf->verify_client_cert_cmd && !conf->verify_tmp_dir) {
2712                 ERROR("You MUST set the verify directory in order to use verify_client_cmd");
2713                 goto error;
2714         }
2715
2716         /*
2717          *      Cache conf in cs in case we're asked to parse this again.
2718          */
2719         cf_data_add(cs, "tls-conf", conf, NULL);
2720
2721         return conf;
2722 }
2723
2724 fr_tls_server_conf_t *tls_client_conf_parse(CONF_SECTION *cs)
2725 {
2726         fr_tls_server_conf_t *conf;
2727
2728         conf = cf_data_find(cs, "tls-conf");
2729         if (conf) {
2730                 DEBUG("Using cached TLS configuration from previous invocation");
2731                 return conf;
2732         }
2733
2734         conf = tls_server_conf_alloc(cs);
2735
2736         if (cf_section_parse(cs, conf, tls_client_config) < 0) {
2737         error:
2738                 talloc_free(conf);
2739                 return NULL;
2740         }
2741
2742         /*
2743          *      Save people from their own stupidity.
2744          */
2745         if (conf->fragment_size < 100) conf->fragment_size = 100;
2746
2747         /*
2748          *      Initialize TLS
2749          */
2750         conf->ctx = tls_init_ctx(conf, 1);
2751         if (conf->ctx == NULL) {
2752                 goto error;
2753         }
2754
2755         {
2756                 char *dh_file;
2757
2758                 memcpy(&dh_file, &conf->dh_file, sizeof(dh_file));
2759                 if (load_dh_params(conf->ctx, dh_file) < 0) {
2760                         goto error;
2761                 }
2762         }
2763
2764         cf_data_add(cs, "tls-conf", conf, NULL);
2765
2766         return conf;
2767 }
2768
2769 int tls_success(tls_session_t *ssn, REQUEST *request)
2770 {
2771         VALUE_PAIR *vp, *vps = NULL;
2772         fr_tls_server_conf_t *conf;
2773         TALLOC_CTX *talloc_ctx;
2774
2775         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CONF);
2776         rad_assert(conf != NULL);
2777
2778         talloc_ctx = SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_TALLOC);
2779
2780         /*
2781          *      If there's no session resumption, delete the entry
2782          *      from the cache.  This means either it's disabled
2783          *      globally for this SSL context, OR we were told to
2784          *      disable it for this user.
2785          *
2786          *      This also means you can't turn it on just for one
2787          *      user.
2788          */
2789         if ((!ssn->allow_session_resumption) ||
2790             (((vp = pairfind(request->config, PW_ALLOW_SESSION_RESUMPTION, 0, TAG_ANY)) != NULL) &&
2791              (vp->vp_integer == 0))) {
2792                 SSL_CTX_remove_session(ssn->ctx,
2793                                        ssn->ssl->session);
2794                 ssn->allow_session_resumption = false;
2795
2796                 /*
2797                  *      If we're in a resumed session and it's
2798                  *      not allowed,
2799                  */
2800                 if (SSL_session_reused(ssn->ssl)) {
2801                         RDEBUG("FAIL: Forcibly stopping session resumption as it is not allowed");
2802                         return -1;
2803                 }
2804         /*
2805          *      Else resumption IS allowed, so we store the
2806          *      user data in the cache.
2807          */
2808         } else if (!SSL_session_reused(ssn->ssl)) {
2809                 size_t size;
2810                 VALUE_PAIR **certs;
2811                 char buffer[2 * MAX_SESSION_SIZE + 1];
2812
2813                 size = ssn->ssl->session->session_id_length;
2814                 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
2815
2816                 fr_bin2hex(buffer, ssn->ssl->session->session_id, size);
2817
2818                 vp = paircopy_by_num(talloc_ctx, request->reply->vps, PW_USER_NAME, 0, TAG_ANY);
2819                 if (vp) pairadd(&vps, vp);
2820
2821                 vp = paircopy_by_num(talloc_ctx, request->packet->vps, PW_STRIPPED_USER_NAME, 0, TAG_ANY);
2822                 if (vp) pairadd(&vps, vp);
2823
2824                 vp = paircopy_by_num(talloc_ctx, request->packet->vps, PW_STRIPPED_USER_DOMAIN, 0, TAG_ANY);
2825                 if (vp) pairadd(&vps, vp);
2826
2827                 vp = paircopy_by_num(talloc_ctx, request->reply->vps, PW_CHARGEABLE_USER_IDENTITY, 0, TAG_ANY);
2828                 if (vp) pairadd(&vps, vp);
2829
2830                 vp = paircopy_by_num(talloc_ctx, request->reply->vps, PW_CACHED_SESSION_POLICY, 0, TAG_ANY);
2831                 if (vp) pairadd(&vps, vp);
2832
2833                 certs = (VALUE_PAIR **)SSL_get_ex_data(ssn->ssl, fr_tls_ex_index_certs);
2834
2835                 /*
2836                  *      Hmm... the certs should probably be session data.
2837                  */
2838                 if (certs) {
2839                         /*
2840                          *      @todo: some go into reply, others into
2841                          *      request
2842                          */
2843                         pairadd(&vps, paircopy(talloc_ctx, *certs));
2844                 }
2845
2846                 if (vps) {
2847                         RDEBUG2("Saving session %s vps %p in the cache", buffer, vps);
2848                         SSL_SESSION_set_ex_data(ssn->ssl->session, fr_tls_ex_index_vps, vps);
2849                         if (conf->session_cache_path) {
2850                                 /* write the VPs to the cache file */
2851                                 char filename[256], buf[1024];
2852                                 FILE *vp_file;
2853
2854                                 snprintf(filename, sizeof(filename), "%s%c%s.vps", conf->session_cache_path,
2855                                          FR_DIR_SEP, buffer);
2856                                 vp_file = fopen(filename, "w");
2857                                 if (vp_file == NULL) {
2858                                         RDEBUG2("Could not write session VPs to persistent cache: %s",
2859                                                 fr_syserror(errno));
2860                                 } else {
2861                                         vp_cursor_t cursor;
2862                                         /* generate a dummy user-style entry which is easy to read back */
2863                                         fprintf(vp_file, "# SSL cached session\n");
2864                                         fprintf(vp_file, "%s\n", buffer);
2865                                         for (vp = fr_cursor_init(&cursor, &vps);
2866                                              vp;
2867                                              vp = fr_cursor_next(&cursor)) {
2868                                                 vp_prints(buf, sizeof(buf), vp);
2869                                                 fprintf(vp_file, "\t%s,\n", buf);
2870                                         }
2871                                         fclose(vp_file);
2872                                 }
2873                         }
2874                 } else {
2875                         RDEBUG2("No information to cache: session caching will be disabled for session %s", buffer);
2876                         SSL_CTX_remove_session(ssn->ctx, ssn->ssl->session);
2877                 }
2878
2879         /*
2880          *      Else the session WAS allowed.  Copy the cached reply.
2881          */
2882         } else {
2883                 size_t size;
2884                 char buffer[2 * MAX_SESSION_SIZE + 1];
2885
2886                 size = ssn->ssl->session->session_id_length;
2887                 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
2888
2889                 fr_bin2hex(buffer, ssn->ssl->session->session_id, size);
2890
2891                 vps = SSL_SESSION_get_ex_data(ssn->ssl->session, fr_tls_ex_index_vps);
2892                 if (!vps) {
2893                         RWDEBUG("No information in cached session %s", buffer);
2894                         return -1;
2895                 } else {
2896                         vp_cursor_t cursor;
2897
2898                         RDEBUG("Adding cached attributes for session %s:", buffer);
2899                         rdebug_pair_list(L_DBG_LVL_1, request, vps, NULL);
2900                         for (vp = fr_cursor_init(&cursor, &vps);
2901                              vp;
2902                              vp = fr_cursor_next(&cursor)) {
2903                                 /*
2904                                  *      TLS-* attrs get added back to
2905                                  *      the request list.
2906                                  */
2907                                 if ((vp->da->vendor == 0) &&
2908                                     (vp->da->attr >= PW_TLS_CERT_SERIAL) &&
2909                                     (vp->da->attr <= PW_TLS_CLIENT_CERT_SUBJECT_ALT_NAME_UPN)) {
2910                                         pairadd(&request->packet->vps, paircopyvp(request->packet, vp));
2911                                 } else {
2912                                         pairadd(&request->reply->vps, paircopyvp(request->reply, vp));
2913                                 }
2914                         }
2915
2916                         if (conf->session_cache_path) {
2917                                 /* "touch" the cached session/vp file */
2918                                 char filename[256];
2919
2920                                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
2921                                         conf->session_cache_path, FR_DIR_SEP, buffer);
2922                                 utime(filename, NULL);
2923                                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
2924                                         conf->session_cache_path, FR_DIR_SEP, buffer);
2925                                 utime(filename, NULL);
2926                         }
2927
2928                         /*
2929                          *      Mark the request as resumed.
2930                          */
2931                         pairmake_packet("EAP-Session-Resumed", "1", T_OP_SET);
2932                 }
2933         }
2934
2935         return 0;
2936 }
2937
2938
2939 void tls_fail(tls_session_t *ssn)
2940 {
2941         /*
2942          *      Force the session to NOT be cached.
2943          */
2944         SSL_CTX_remove_session(ssn->ctx, ssn->ssl->session);
2945 }
2946
2947 fr_tls_status_t tls_application_data(tls_session_t *ssn,
2948                                      REQUEST *request)
2949
2950 {
2951         int err;
2952
2953         /*
2954          *      Decrypt the complete record.
2955          */
2956         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data,
2957                         ssn->dirty_in.used);
2958         if (err != (int) ssn->dirty_in.used) {
2959                 record_init(&ssn->dirty_in);
2960                 RDEBUG("Failed writing %d to SSL BIO: %d", ssn->dirty_in.used, err);
2961                 return FR_TLS_FAIL;
2962         }
2963
2964         /*
2965          *      Clear the dirty buffer now that we are done with it
2966          *      and init the clean_out buffer to store decrypted data
2967          */
2968         record_init(&ssn->dirty_in);
2969         record_init(&ssn->clean_out);
2970
2971         /*
2972          *      Read (and decrypt) the tunneled data from the
2973          *      SSL session, and put it into the decrypted
2974          *      data buffer.
2975          */
2976         err = SSL_read(ssn->ssl, ssn->clean_out.data, sizeof(ssn->clean_out.data));
2977         if (err < 0) {
2978                 int code;
2979
2980                 RDEBUG("SSL_read Error");
2981
2982                 code = SSL_get_error(ssn->ssl, err);
2983                 switch (code) {
2984                 case SSL_ERROR_WANT_READ:
2985                         DEBUG("Error in fragmentation logic: SSL_WANT_READ");
2986                         return FR_TLS_MORE_FRAGMENTS;
2987
2988                 case SSL_ERROR_WANT_WRITE:
2989                         DEBUG("Error in fragmentation logic: SSL_WANT_WRITE");
2990                         break;
2991
2992                 default:
2993                         DEBUG("Error in fragmentation logic: %s", ERR_error_string(code, NULL));
2994
2995                         /*
2996                          *      FIXME: Call int_ssl_check?
2997                          */
2998                         break;
2999                 }
3000                 return FR_TLS_FAIL;
3001         }
3002
3003         if (err == 0) RWDEBUG("No data inside of the tunnel");
3004
3005         /*
3006          *      Passed all checks, successfully decrypted data
3007          */
3008         ssn->clean_out.used = err;
3009
3010         return FR_TLS_OK;
3011 }
3012
3013
3014 /*
3015  * Acknowledge received is for one of the following messages sent earlier
3016  * 1. Handshake completed Message, so now send, EAP-Success
3017  * 2. Alert Message, now send, EAP-Failure
3018  * 3. Fragment Message, now send, next Fragment
3019  */
3020 fr_tls_status_t tls_ack_handler(tls_session_t *ssn, REQUEST *request)
3021 {
3022         RDEBUG2("Received TLS ACK");
3023
3024         if (ssn == NULL){
3025                 RERROR("FAIL: Unexpected ACK received.  Could not obtain session information");
3026                 return FR_TLS_INVALID;
3027         }
3028         if (ssn->info.initialized == 0) {
3029                 RDEBUG("No SSL info available. Waiting for more SSL data");
3030                 return FR_TLS_REQUEST;
3031         }
3032         if ((ssn->info.content_type == handshake) && (ssn->info.origin == 0)) {
3033                 RERROR("FAIL: ACK without earlier message");
3034                 return FR_TLS_INVALID;
3035         }
3036
3037         switch (ssn->info.content_type) {
3038         case alert:
3039                 RDEBUG2("ACK alert");
3040                 return FR_TLS_FAIL;
3041
3042         case handshake:
3043                 if ((ssn->info.handshake_type == handshake_finished) && (ssn->dirty_out.used == 0)) {
3044                         RDEBUG2("ACK handshake is finished");
3045
3046                         /*
3047                          *      From now on all the content is
3048                          *      application data set it here as nobody else
3049                          *      sets it.
3050                          */
3051                         ssn->info.content_type = application_data;
3052                         return FR_TLS_SUCCESS;
3053                 } /* else more data to send */
3054
3055                 RDEBUG2("ACK handshake fragment handler");
3056                 /* Fragmentation handler, send next fragment */
3057                 return FR_TLS_REQUEST;
3058
3059         case application_data:
3060                 RDEBUG2("ACK handshake fragment handler in application data");
3061                 return FR_TLS_REQUEST;
3062
3063                 /*
3064                  *      For the rest of the conditions, switch over
3065                  *      to the default section below.
3066                  */
3067         default:
3068                 RERROR("Invalid ACK received: %d", ssn->info.content_type);
3069
3070                 return FR_TLS_INVALID;
3071         }
3072 }
3073
3074 #endif  /* WITH_TLS */
3075