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 #define LOG_PREFIX "tls"
  60
  61 #ifdef ENABLE_OPENSSL_VERSION_CHECK
  62 typedef struct libssl_defect {
  63         uint64_t        high;
  64         uint64_t        low;
  65
  66         char const      *id;
  67         char const      *name;
  68         char const      *comment;
  69 } libssl_defect_t;
  70
  71 /* Record critical defects in libssl here (newest first)*/
  72 static libssl_defect_t libssl_defects[] =
  73 {
  74         {
  75                 .low            = 0x010001000,          /* 1.0.1  */
  76                 .high           = 0x01000106f,          /* 1.0.1f */
  77                 .id             = "CVE-2014-0160",
  78                 .name           = "Heartbleed",
  79                 .comment        = "For more information see http://heartbleed.com"
  80         }
  81 };
  82 #endif /* ENABLE_OPENSSL_VERSION_CHECK */
  83
  84 FR_NAME_NUMBER const fr_tls_status_table[] = {
  85         { "invalid",                    FR_TLS_INVALID },
  86         { "request",                    FR_TLS_REQUEST },
  87         { "response",                   FR_TLS_RESPONSE },
  88         { "success",                    FR_TLS_SUCCESS },
  89         { "fail",                       FR_TLS_FAIL },
  90         { "noop",                       FR_TLS_NOOP },
  91
  92         { "start",                      FR_TLS_START },
  93         { "ok",                         FR_TLS_OK },
  94         { "ack",                        FR_TLS_ACK },
  95         { "first fragment",             FR_TLS_FIRST_FRAGMENT },
  96         { "more fragments",             FR_TLS_MORE_FRAGMENTS },
  97         { "length included",            FR_TLS_LENGTH_INCLUDED },
  98         { "more fragments with length", FR_TLS_MORE_FRAGMENTS_WITH_LENGTH },
  99         { "handled",                    FR_TLS_HANDLED },
 100         {  NULL ,                       -1},
 101 };
 102
 103 /* index we use to store cached session VPs
 104  * needs to be dynamic so we can supply a "free" function
 105  */
 106 int fr_tls_ex_index_vps = -1;
 107 int fr_tls_ex_index_certs = -1;
 108
 109 /* Session */
 110 static void             session_close(tls_session_t *ssn);
 111 static void             session_init(tls_session_t *ssn);
 112
 113 /* record */
 114 static void             record_init(record_t *buf);
 115 static void             record_close(record_t *buf);
 116 static unsigned int     record_plus(record_t *buf, void const *ptr,
 117                                     unsigned int size);
 118 static unsigned int     record_minus(record_t *buf, void *ptr,
 119                                      unsigned int size);
 120
 121 #ifdef PSK_MAX_IDENTITY_LEN
 122 static bool identity_is_safe(const char *identity)
 123 {
 124         char c;
 125
 126         if (!identity) return true;
 127
 128         while ((c = *(identity++)) != '\0') {
 129                 if (isalpha((int) c) || isdigit((int) c) || isspace((int) c) ||
 130                     (c == '@') || (c == '-') || (c == '_') || (c == '.')) {
 131                         continue;
 132                 }
 133
 134                 return false;
 135         }
 136
 137         return true;
 138 }
 139
 140
 141 /*
 142  *      When a client uses TLS-PSK to talk to a server, this callback
 143  *      is used by the server to determine the PSK to use.
 144  */
 145 static unsigned int psk_server_callback(SSL *ssl, const char *identity,
 146                                         unsigned char *psk,
 147                                         unsigned int max_psk_len)
 148 {
 149         unsigned int psk_len = 0;
 150         fr_tls_server_conf_t *conf;
 151         REQUEST *request;
 152
 153         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl,
 154                                                        FR_TLS_EX_INDEX_CONF);
 155         if (!conf) return 0;
 156
 157         request = (REQUEST *)SSL_get_ex_data(ssl,
 158                                              FR_TLS_EX_INDEX_REQUEST);
 159         if (request && conf->psk_query) {
 160                 size_t hex_len;
 161                 VALUE_PAIR *vp;
 162                 char buffer[2 * PSK_MAX_PSK_LEN + 4]; /* allow for too-long keys */
 163
 164                 /*
 165                  *      The passed identity is weird.  Deny it.
 166                  */
 167                 if (!identity_is_safe(identity)) {
 168                         RWDEBUG("Invalid characters in PSK identity %s", identity);
 169                         return 0;
 170                 }
 171
 172                 vp = pair_make_request("TLS-PSK-Identity", identity, T_OP_SET);
 173                 if (!vp) return 0;
 174
 175                 hex_len = radius_xlat(buffer, sizeof(buffer), request, conf->psk_query,
 176                                       NULL, NULL);
 177                 if (!hex_len) {
 178                         RWDEBUG("PSK expansion returned an empty string.");
 179                         return 0;
 180                 }
 181
 182                 /*
 183                  *      The returned key is truncated at MORE than
 184                  *      OpenSSL can handle.  That way we can detect
 185                  *      the truncation, and complain about it.
 186                  */
 187                 if (hex_len > (2 * max_psk_len)) {
 188                         RWDEBUG("Returned PSK is too long (%u > %u)",
 189                                 (unsigned int) hex_len, 2 * max_psk_len);
 190                         return 0;
 191                 }
 192
 193                 /*
 194                  *      Leave the TLS-PSK-Identity in the request, and
 195                  *      convert the expansion from printable string
 196                  *      back to hex.
 197                  */
 198                 return fr_hex2bin(psk, max_psk_len, buffer, hex_len);
 199         }
 200
 201         if (!conf->psk_identity) {
 202                 DEBUG("No static PSK identity set.  Rejecting the user");
 203                 return 0;
 204         }
 205
 206         /*
 207          *      No REQUEST, or no dynamic query.  Just look for a
 208          *      static identity.
 209          */
 210         if (strcmp(identity, conf->psk_identity) != 0) {
 211                 ERROR("Supplied PSK identity %s does not match configuration.  Rejecting.",
 212                       identity);
 213                 return 0;
 214         }
 215
 216         psk_len = strlen(conf->psk_password);
 217         if (psk_len > (2 * max_psk_len)) return 0;
 218
 219         return fr_hex2bin(psk, max_psk_len, conf->psk_password, psk_len);
 220 }
 221
 222 static unsigned int psk_client_callback(SSL *ssl, UNUSED char const *hint,
 223                                         char *identity, unsigned int max_identity_len,
 224                                         unsigned char *psk, unsigned int max_psk_len)
 225 {
 226         unsigned int psk_len;
 227         fr_tls_server_conf_t *conf;
 228
 229         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl,
 230                                                        FR_TLS_EX_INDEX_CONF);
 231         if (!conf) return 0;
 232
 233         psk_len = strlen(conf->psk_password);
 234         if (psk_len > (2 * max_psk_len)) return 0;
 235
 236         strlcpy(identity, conf->psk_identity, max_identity_len);
 237
 238         return fr_hex2bin(psk, max_psk_len, conf->psk_password, psk_len);
 239 }
 240
 241 #endif
 242
 243 static int _tls_session_free(tls_session_t *ssn)
 244 {
 245         /*
 246          *      Free any opaque TTLS or PEAP data.
 247          */
 248         if ((ssn->opaque) && (ssn->free_opaque)) {
 249                 ssn->free_opaque(ssn->opaque);
 250                 ssn->opaque = NULL;
 251         }
 252
 253         session_close(ssn);
 254
 255         return 0;
 256 }
 257
 258 tls_session_t *tls_new_client_session(TALLOC_CTX *ctx, fr_tls_server_conf_t *conf, int fd)
 259 {
 260         int verify_mode;
 261         tls_session_t *ssn = NULL;
 262         REQUEST *request;
 263
 264         ssn = talloc_zero(ctx, tls_session_t);
 265         if (!ssn) return NULL;
 266
 267         talloc_set_destructor(ssn, _tls_session_free);
 268
 269         ssn->ctx = conf->ctx;
 270
 271         SSL_CTX_set_mode(ssn->ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER | SSL_MODE_AUTO_RETRY);
 272
 273         ssn->ssl = SSL_new(ssn->ctx);
 274         if (!ssn->ssl) {
 275                 talloc_free(ssn);
 276                 return NULL;
 277         }
 278
 279         request = request_alloc(ssn);
 280         SSL_set_ex_data(ssn->ssl, FR_TLS_EX_INDEX_REQUEST, (void *)request);
 281
 282         /*
 283          *      Add the message callback to identify what type of
 284          *      message/handshake is passed
 285          */
 286         SSL_set_msg_callback(ssn->ssl, cbtls_msg);
 287         SSL_set_msg_callback_arg(ssn->ssl, ssn);
 288         SSL_set_info_callback(ssn->ssl, cbtls_info);
 289
 290         /*
 291          *      Always verify the peer certificate.
 292          */
 293         DEBUG2("Requiring Server certificate");
 294         verify_mode = SSL_VERIFY_PEER;
 295         verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
 296         SSL_set_verify(ssn->ssl, verify_mode, cbtls_verify);
 297
 298         SSL_set_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CONF, (void *)conf);
 299         SSL_set_ex_data(ssn->ssl, FR_TLS_EX_INDEX_SSN, (void *)ssn);
 300         SSL_set_fd(ssn->ssl, fd);
 301         if (SSL_connect(ssn->ssl) <= 0) {
 302                 int err;
 303                 while ((err = ERR_get_error())) {
 304                         ERROR("tls: %s", ERR_error_string(err, NULL));
 305                 }
 306                 talloc_free(ssn);
 307
 308                 return NULL;
 309         }
 310
 311         ssn->mtu = conf->fragment_size;
 312
 313         return ssn;
 314 }
 315
 316
 317 /** Create a new TLS session
 318  *
 319  * Configures a new TLS session, configuring options, setting callbacks etc...
 320  *
 321  * @param ctx to alloc session data in. Should usually be NULL unless the lifetime of the
 322  *      session is tied to another talloc'd object.
 323  * @param conf to use to configure the tls session.
 324  * @param request The current #REQUEST.
 325  * @param client_cert Whether to require a client_cert.
 326  * @return a new session on success, or NULL on error.
 327  */
 328 tls_session_t *tls_new_session(TALLOC_CTX *ctx, fr_tls_server_conf_t *conf, REQUEST *request, bool client_cert)
 329 {
 330         tls_session_t   *state = NULL;
 331         SSL             *new_tls = NULL;
 332         int             verify_mode = 0;
 333         VALUE_PAIR      *vp;
 334
 335         rad_assert(request != NULL);
 336
 337         RDEBUG2("Initiating new EAP-TLS session");
 338
 339         /*
 340          *      Manually flush the sessions every so often.  If HALF
 341          *      of the session lifetime has passed since we last
 342          *      flushed, then flush it again.
 343          *
 344          *      FIXME: Also do it every N sessions?
 345          */
 346         if (conf->session_cache_enable &&
 347             ((conf->session_last_flushed + ((int)conf->session_timeout * 1800)) <= request->timestamp)){
 348                 RDEBUG2("Flushing SSL sessions (of #%ld)", SSL_CTX_sess_number(conf->ctx));
 349
 350                 SSL_CTX_flush_sessions(conf->ctx, request->timestamp);
 351                 conf->session_last_flushed = request->timestamp;
 352         }
 353
 354         if ((new_tls = SSL_new(conf->ctx)) == NULL) {
 355                 RERROR("Error creating new SSL session: %s", ERR_error_string(ERR_get_error(), NULL));
 356                 return NULL;
 357         }
 358
 359         /* We use the SSL's "app_data" to indicate a call-back */
 360         SSL_set_app_data(new_tls, NULL);
 361
 362         if ((state = talloc_zero(ctx, tls_session_t)) == NULL) {
 363                 RERROR("Error allocating memory for SSL state");
 364                 return NULL;
 365         }
 366         session_init(state);
 367         talloc_set_destructor(state, _tls_session_free);
 368
 369         state->ctx = conf->ctx;
 370         state->ssl = new_tls;
 371
 372         /*
 373          *      Initialize callbacks
 374          */
 375         state->record_init = record_init;
 376         state->record_close = record_close;
 377         state->record_plus = record_plus;
 378         state->record_minus = record_minus;
 379
 380         /*
 381          *      Create & hook the BIOs to handle the dirty side of the
 382          *      SSL.  This is *very important* as we want to handle
 383          *      the transmission part.  Now the only IO interface
 384          *      that SSL is aware of, is our defined BIO buffers.
 385          *
 386          *      This means that all SSL IO is done to/from memory,
 387          *      and we can update those BIOs from the packets we've
 388          *      received.
 389          */
 390         state->into_ssl = BIO_new(BIO_s_mem());
 391         state->from_ssl = BIO_new(BIO_s_mem());
 392         SSL_set_bio(state->ssl, state->into_ssl, state->from_ssl);
 393
 394         /*
 395          *      Add the message callback to identify what type of
 396          *      message/handshake is passed
 397          */
 398         SSL_set_msg_callback(new_tls, cbtls_msg);
 399         SSL_set_msg_callback_arg(new_tls, state);
 400         SSL_set_info_callback(new_tls, cbtls_info);
 401
 402         /*
 403          *      In Server mode we only accept.
 404          */
 405         SSL_set_accept_state(state->ssl);
 406
 407         /*
 408          *      Verify the peer certificate, if asked.
 409          */
 410         if (client_cert) {
 411                 RDEBUG2("Setting verify mode to require certificate from client");
 412                 verify_mode = SSL_VERIFY_PEER;
 413                 verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
 414                 verify_mode |= SSL_VERIFY_CLIENT_ONCE;
 415         }
 416         SSL_set_verify(state->ssl, verify_mode, cbtls_verify);
 417
 418         SSL_set_ex_data(state->ssl, FR_TLS_EX_INDEX_CONF, (void *)conf);
 419         SSL_set_ex_data(state->ssl, FR_TLS_EX_INDEX_SSN, (void *)state);
 420         state->length_flag = conf->include_length;
 421
 422         /*
 423          *      We use default fragment size, unless the Framed-MTU
 424          *      tells us it's too big.  Note that we do NOT account
 425          *      for the EAP-TLS headers if conf->fragment_size is
 426          *      large, because that config item looks to be confusing.
 427          *
 428          *      i.e. it should REALLY be called MTU, and the code here
 429          *      should figure out what that means for TLS fragment size.
 430          *      asking the administrator to know the internal details
 431          *      of EAP-TLS in order to calculate fragment sizes is
 432          *      just too much.
 433          */
 434         state->mtu = conf->fragment_size;
 435         vp = fr_pair_find_by_num(request->packet->vps, PW_FRAMED_MTU, 0, TAG_ANY);
 436         if (vp && (vp->vp_integer > 100) && (vp->vp_integer < state->mtu)) {
 437                 state->mtu = vp->vp_integer;
 438         }
 439
 440         if (conf->session_cache_enable) state->allow_session_resumption = true; /* otherwise it's false */
 441
 442         return state;
 443 }
 444
 445 /*
 446  *      Print out some text describing the error.
 447  */
 448 static int int_ssl_check(REQUEST *request, SSL *s, int ret, char const *text)
 449 {
 450         int e;
 451         unsigned long l;
 452
 453         if ((l = ERR_get_error()) != 0) {
 454                 char const *p = ERR_error_string(l, NULL);
 455
 456                 if (p) ROPTIONAL(REDEBUG, ERROR, "SSL says: %s", p);
 457         }
 458
 459         e = SSL_get_error(s, ret);
 460         switch (e) {
 461         /*
 462          *      These seem to be harmless and already "dealt
 463          *      with" by our non-blocking environment. NB:
 464          *      "ZERO_RETURN" is the clean "error"
 465          *      indicating a successfully closed SSL
 466          *      tunnel. We let this happen because our IO
 467          *      loop should not appear to have broken on
 468          *      this condition - and outside the IO loop, the
 469          *      "shutdown" state is checked.
 470          *
 471          *      Don't print anything if we ignore the error.
 472          */
 473         case SSL_ERROR_NONE:
 474         case SSL_ERROR_WANT_READ:
 475         case SSL_ERROR_WANT_WRITE:
 476         case SSL_ERROR_WANT_X509_LOOKUP:
 477         case SSL_ERROR_ZERO_RETURN:
 478                 break;
 479
 480         /*
 481          *      These seem to be indications of a genuine
 482          *      error that should result in the SSL tunnel
 483          *      being regarded as "dead".
 484          */
 485         case SSL_ERROR_SYSCALL:
 486                 ROPTIONAL(REDEBUG, ERROR, "%s failed in a system call (%d), TLS session failed", text, ret);
 487                 return 0;
 488
 489         case SSL_ERROR_SSL:
 490                 ROPTIONAL(REDEBUG, ERROR, "%s failed inside of TLS (%d), TLS session failed", text, ret);
 491                 return 0;
 492
 493         /*
 494          *      For any other errors that (a) exist, and (b)
 495          *      crop up - we need to interpret what to do with
 496          *      them - so "politely inform" the caller that
 497          *      the code needs updating here.
 498          */
 499         default:
 500                 ROPTIONAL(REDEBUG, ERROR, "FATAL SSL error: %d", e);
 501                 return 0;
 502         }
 503
 504         return 1;
 505 }
 506
 507 /*
 508  * We are the server, we always get the dirty data
 509  * (Handshake data is also considered as dirty data)
 510  * During handshake, since SSL API handles itself,
 511  * After clean-up, dirty_out will be filled with
 512  * the data required for handshaking. So we check
 513  * if dirty_out is empty then we simply send it back.
 514  * As of now, if handshake is successful, then we keep going,
 515  * otherwise we fail.
 516  *
 517  * Fill the Bio with the dirty data to clean it
 518  * Get the cleaned data from SSL, if it is not Handshake data
 519  */
 520 int tls_handshake_recv(REQUEST *request, tls_session_t *ssn)
 521 {
 522         int err;
 523
 524         if (ssn->invalid_hb_used) return 0;
 525
 526         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data, ssn->dirty_in.used);
 527         if (err != (int) ssn->dirty_in.used) {
 528                 REDEBUG("Failed writing %zd bytes to SSL BIO: %d", ssn->dirty_in.used, err);
 529                 record_init(&ssn->dirty_in);
 530                 return 0;
 531         }
 532         record_init(&ssn->dirty_in);
 533
 534         err = SSL_read(ssn->ssl, ssn->clean_out.data + ssn->clean_out.used,
 535                        sizeof(ssn->clean_out.data) - ssn->clean_out.used);
 536         if (err > 0) {
 537                 ssn->clean_out.used += err;
 538                 return 1;
 539         }
 540
 541         if (!int_ssl_check(request, ssn->ssl, err, "SSL_read")) return 0;
 542
 543         /* Some Extra STATE information for easy debugging */
 544         if (SSL_is_init_finished(ssn->ssl)) RDEBUG2("SSL Connection Established");
 545         if (SSL_in_init(ssn->ssl)) RDEBUG2("In SSL Handshake Phase");
 546         if (SSL_in_before(ssn->ssl)) RDEBUG2("Before SSL Handshake Phase");
 547         if (SSL_in_accept_init(ssn->ssl)) RDEBUG2("In SSL Accept mode");
 548         if (SSL_in_connect_init(ssn->ssl)) RDEBUG2("In SSL Connect mode");
 549
 550         err = BIO_ctrl_pending(ssn->from_ssl);
 551         if (err > 0) {
 552                 err = BIO_read(ssn->from_ssl, ssn->dirty_out.data,
 553                                sizeof(ssn->dirty_out.data));
 554                 if (err > 0) {
 555                         ssn->dirty_out.used = err;
 556
 557                 } else if (BIO_should_retry(ssn->from_ssl)) {
 558                         record_init(&ssn->dirty_in);
 559                         RDEBUG2("Asking for more data in tunnel");
 560                         return 1;
 561
 562                 } else {
 563                         int_ssl_check(request, ssn->ssl, err, "BIO_read");
 564                         record_init(&ssn->dirty_in);
 565                         return 0;
 566                 }
 567         } else {
 568                 RDEBUG2("SSL Application Data");
 569                 /* Its clean application data, do whatever we want */
 570                 record_init(&ssn->clean_out);
 571         }
 572
 573         /* We are done with dirty_in, reinitialize it */
 574         record_init(&ssn->dirty_in);
 575         return 1;
 576 }
 577
 578 /*
 579  *      Take cleartext user data, and encrypt it into the output buffer,
 580  *      to send to the client at the other end of the SSL connection.
 581  */
 582 int tls_handshake_send(REQUEST *request, tls_session_t *ssn)
 583 {
 584         int err;
 585
 586         /*
 587          *      If there's un-encrypted data in 'clean_in', then write
 588          *      that data to the SSL session, and then call the BIO function
 589          *      to get that encrypted data from the SSL session, into
 590          *      a buffer which we can then package into an EAP packet.
 591          *
 592          *      Based on Server's logic this clean_in is expected to
 593          *      contain the data to send to the client.
 594          */
 595         if (ssn->clean_in.used > 0) {
 596                 int written;
 597
 598                 written = SSL_write(ssn->ssl, ssn->clean_in.data, ssn->clean_in.used);
 599                 record_minus(&ssn->clean_in, NULL, written);
 600
 601                 /* Get the dirty data from Bio to send it */
 602                 err = BIO_read(ssn->from_ssl, ssn->dirty_out.data,
 603                                sizeof(ssn->dirty_out.data));
 604                 if (err > 0) {
 605                         ssn->dirty_out.used = err;
 606                 } else {
 607                         int_ssl_check(request, ssn->ssl, err, "handshake_send");
 608                 }
 609         }
 610
 611         return 1;
 612 }
 613
 614 static void session_init(tls_session_t *ssn)
 615 {
 616         ssn->ssl = NULL;
 617         ssn->into_ssl = ssn->from_ssl = NULL;
 618         record_init(&ssn->clean_in);
 619         record_init(&ssn->clean_out);
 620         record_init(&ssn->dirty_in);
 621         record_init(&ssn->dirty_out);
 622
 623         memset(&ssn->info, 0, sizeof(ssn->info));
 624
 625         ssn->mtu = 0;
 626         ssn->fragment = false;
 627         ssn->tls_msg_len = 0;
 628         ssn->length_flag = false;
 629         ssn->opaque = NULL;
 630         ssn->free_opaque = NULL;
 631 }
 632
 633 static void session_close(tls_session_t *ssn)
 634 {
 635         SSL_set_quiet_shutdown(ssn->ssl, 1);
 636         SSL_shutdown(ssn->ssl);
 637
 638         if (ssn->ssl) {
 639                 SSL_free(ssn->ssl);
 640                 ssn->ssl = NULL;
 641         }
 642
 643         record_close(&ssn->clean_in);
 644         record_close(&ssn->clean_out);
 645         record_close(&ssn->dirty_in);
 646         record_close(&ssn->dirty_out);
 647         session_init(ssn);
 648 }
 649
 650 static void record_init(record_t *rec)
 651 {
 652         rec->used = 0;
 653 }
 654
 655 static void record_close(record_t *rec)
 656 {
 657         rec->used = 0;
 658 }
 659
 660
 661 /*
 662  *      Copy data to the intermediate buffer, before we send
 663  *      it somewhere.
 664  */
 665 static unsigned int record_plus(record_t *rec, void const *ptr,
 666                                 unsigned int size)
 667 {
 668         unsigned int added = MAX_RECORD_SIZE - rec->used;
 669
 670         if(added > size)
 671                 added = size;
 672         if(added == 0)
 673                 return 0;
 674         memcpy(rec->data + rec->used, ptr, added);
 675         rec->used += added;
 676         return added;
 677 }
 678
 679 /*
 680  *      Take data from the buffer, and give it to the caller.
 681  */
 682 static unsigned int record_minus(record_t *rec, void *ptr,
 683                                  unsigned int size)
 684 {
 685         unsigned int taken = rec->used;
 686
 687         if(taken > size)
 688                 taken = size;
 689         if(taken == 0)
 690                 return 0;
 691         if(ptr)
 692                 memcpy(ptr, rec->data, taken);
 693         rec->used -= taken;
 694
 695         /*
 696          *      This is pretty bad...
 697          */
 698         if(rec->used > 0)
 699                 memmove(rec->data, rec->data + taken, rec->used);
 700         return taken;
 701 }
 702
 703 void tls_session_information(tls_session_t *tls_session)
 704 {
 705         char const *str_write_p, *str_version, *str_content_type = "";
 706         char const *str_details1 = "", *str_details2= "";
 707         REQUEST *request;
 708         char buffer[32];
 709
 710         /*
 711          *      Don't print this out in the normal course of
 712          *      operations.
 713          */
 714         if (rad_debug_lvl == 0) {
 715                 return;
 716         }
 717
 718         str_write_p = tls_session->info.origin ? ">>>" : "<<<";
 719
 720         switch (tls_session->info.version) {
 721         case SSL2_VERSION:
 722                 str_version = "SSL 2.0 ";
 723                 break;
 724         case SSL3_VERSION:
 725                 str_version = "SSL 3.0 ";
 726                 break;
 727         case TLS1_VERSION:
 728                 str_version = "TLS 1.0 ";
 729                 break;
 730 #ifdef TLS1_1_VERSION
 731         case TLS1_1_VERSION:
 732                 str_version = "TLS 1.1 ";
 733                 break;
 734 #endif
 735 #ifdef TLS1_2_VERSION
 736         case TLS1_2_VERSION:
 737                 str_version = "TLS 1.2 ";
 738                 break;
 739 #endif
 740 #ifdef TLS1_3_VERSON
 741         case TLS1_3_VERSION:
 742                 str_version = "TLS 1.3 ";
 743                 break;
 744 #endif
 745
 746         default:
 747                 sprintf(buffer, "UNKNOWN TLS VERSION ?%04X?", tls_session->info.version);
 748                 str_version = buffer;
 749                 break;
 750         }
 751
 752         if (tls_session->info.version == SSL3_VERSION ||
 753             tls_session->info.version == TLS1_VERSION) {
 754                 switch (tls_session->info.content_type) {
 755                 case SSL3_RT_CHANGE_CIPHER_SPEC:
 756                         str_content_type = "ChangeCipherSpec";
 757                         break;
 758
 759                 case SSL3_RT_ALERT:
 760                         str_content_type = "Alert";
 761                         break;
 762
 763                 case SSL3_RT_HANDSHAKE:
 764                         str_content_type = "Handshake";
 765                         break;
 766
 767                 case SSL3_RT_APPLICATION_DATA:
 768                         str_content_type = "ApplicationData";
 769                         break;
 770
 771                 default:
 772                         str_content_type = "UnknownContentType";
 773                         break;
 774                 }
 775
 776                 if (tls_session->info.content_type == SSL3_RT_ALERT) {
 777                         str_details1 = ", ???";
 778
 779                         if (tls_session->info.record_len == 2) {
 780
 781                                 switch (tls_session->info.alert_level) {
 782                                 case SSL3_AL_WARNING:
 783                                         str_details1 = ", warning";
 784                                         break;
 785                                 case SSL3_AL_FATAL:
 786                                         str_details1 = ", fatal";
 787                                         break;
 788                                 }
 789
 790                                 str_details2 = " ???";
 791                                 switch (tls_session->info.alert_description) {
 792                                 case SSL3_AD_CLOSE_NOTIFY:
 793                                         str_details2 = " close_notify";
 794                                         break;
 795
 796                                 case SSL3_AD_UNEXPECTED_MESSAGE:
 797                                         str_details2 = " unexpected_message";
 798                                         break;
 799
 800                                 case SSL3_AD_BAD_RECORD_MAC:
 801                                         str_details2 = " bad_record_mac";
 802                                         break;
 803
 804                                 case TLS1_AD_DECRYPTION_FAILED:
 805                                         str_details2 = " decryption_failed";
 806                                         break;
 807
 808                                 case TLS1_AD_RECORD_OVERFLOW:
 809                                         str_details2 = " record_overflow";
 810                                         break;
 811
 812                                 case SSL3_AD_DECOMPRESSION_FAILURE:
 813                                         str_details2 = " decompression_failure";
 814                                         break;
 815
 816                                 case SSL3_AD_HANDSHAKE_FAILURE:
 817                                         str_details2 = " handshake_failure";
 818                                         break;
 819
 820                                 case SSL3_AD_BAD_CERTIFICATE:
 821                                         str_details2 = " bad_certificate";
 822                                         break;
 823
 824                                 case SSL3_AD_UNSUPPORTED_CERTIFICATE:
 825                                         str_details2 = " unsupported_certificate";
 826                                         break;
 827
 828                                 case SSL3_AD_CERTIFICATE_REVOKED:
 829                                         str_details2 = " certificate_revoked";
 830                                         break;
 831
 832                                 case SSL3_AD_CERTIFICATE_EXPIRED:
 833                                         str_details2 = " certificate_expired";
 834                                         break;
 835
 836                                 case SSL3_AD_CERTIFICATE_UNKNOWN:
 837                                         str_details2 = " certificate_unknown";
 838                                         break;
 839
 840                                 case SSL3_AD_ILLEGAL_PARAMETER:
 841                                         str_details2 = " illegal_parameter";
 842                                         break;
 843
 844                                 case TLS1_AD_UNKNOWN_CA:
 845                                         str_details2 = " unknown_ca";
 846                                         break;
 847
 848                                 case TLS1_AD_ACCESS_DENIED:
 849                                         str_details2 = " access_denied";
 850                                         break;
 851
 852                                 case TLS1_AD_DECODE_ERROR:
 853                                         str_details2 = " decode_error";
 854                                         break;
 855
 856                                 case TLS1_AD_DECRYPT_ERROR:
 857                                         str_details2 = " decrypt_error";
 858                                         break;
 859
 860                                 case TLS1_AD_EXPORT_RESTRICTION:
 861                                         str_details2 = " export_restriction";
 862                                         break;
 863
 864                                 case TLS1_AD_PROTOCOL_VERSION:
 865                                         str_details2 = " protocol_version";
 866                                         break;
 867
 868                                 case TLS1_AD_INSUFFICIENT_SECURITY:
 869                                         str_details2 = " insufficient_security";
 870                                         break;
 871
 872                                 case TLS1_AD_INTERNAL_ERROR:
 873                                         str_details2 = " internal_error";
 874                                         break;
 875
 876                                 case TLS1_AD_USER_CANCELLED:
 877                                         str_details2 = " user_canceled";
 878                                         break;
 879
 880                                 case TLS1_AD_NO_RENEGOTIATION:
 881                                         str_details2 = " no_renegotiation";
 882                                         break;
 883                                 }
 884                         }
 885                 }
 886
 887                 if (tls_session->info.content_type == SSL3_RT_HANDSHAKE) {
 888                         str_details1 = "???";
 889
 890                         if (tls_session->info.record_len > 0) switch (tls_session->info.handshake_type) {
 891                         case SSL3_MT_HELLO_REQUEST:
 892                                 str_details1 = ", HelloRequest";
 893                                 break;
 894
 895                         case SSL3_MT_CLIENT_HELLO:
 896                                 str_details1 = ", ClientHello";
 897                                 break;
 898
 899                         case SSL3_MT_SERVER_HELLO:
 900                                 str_details1 = ", ServerHello";
 901                                 break;
 902
 903                         case SSL3_MT_CERTIFICATE:
 904                                 str_details1 = ", Certificate";
 905                                 break;
 906
 907                         case SSL3_MT_SERVER_KEY_EXCHANGE:
 908                                 str_details1 = ", ServerKeyExchange";
 909                                 break;
 910
 911                         case SSL3_MT_CERTIFICATE_REQUEST:
 912                                 str_details1 = ", CertificateRequest";
 913                                 break;
 914
 915                         case SSL3_MT_SERVER_DONE:
 916                                 str_details1 = ", ServerHelloDone";
 917                                 break;
 918
 919                         case SSL3_MT_CERTIFICATE_VERIFY:
 920                                 str_details1 = ", CertificateVerify";
 921                                 break;
 922
 923                         case SSL3_MT_CLIENT_KEY_EXCHANGE:
 924                                 str_details1 = ", ClientKeyExchange";
 925                                 break;
 926
 927                         case SSL3_MT_FINISHED:
 928                                 str_details1 = ", Finished";
 929                                 break;
 930                         }
 931                 }
 932         }
 933
 934         snprintf(tls_session->info.info_description,
 935                  sizeof(tls_session->info.info_description),
 936                  "%s %s%s [length %04lx]%s%s\n",
 937                  str_write_p, str_version, str_content_type,
 938                  (unsigned long)tls_session->info.record_len,
 939                  str_details1, str_details2);
 940
 941         request = SSL_get_ex_data(tls_session->ssl, FR_TLS_EX_INDEX_REQUEST);
 942         if (request) {
 943                 RDEBUG2("%s", tls_session->info.info_description);
 944         } else {
 945                 DEBUG2("%s", tls_session->info.info_description);
 946         }
 947 }
 948
 949 static CONF_PARSER cache_config[] = {
 950         { "enable", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, session_cache_enable), "no" },
 951
 952         { "lifetime", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, session_timeout), "24" },
 953         { "name", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, session_id_name), NULL },
 954
 955         { "max_entries", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, session_cache_size), "255" },
 956         { "persist_dir", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, session_cache_path), NULL },
 957         CONF_PARSER_TERMINATOR
 958 };
 959
 960 static CONF_PARSER verify_config[] = {
 961         { "tmpdir", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, verify_tmp_dir), NULL },
 962         { "client", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, verify_client_cert_cmd), NULL },
 963         CONF_PARSER_TERMINATOR
 964 };
 965
 966 #ifdef HAVE_OPENSSL_OCSP_H
 967 static CONF_PARSER ocsp_config[] = {
 968         { "enable", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_enable), "no" },
 969         { "override_cert_url", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_override_url), "no" },
 970         { "url", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, ocsp_url), NULL },
 971         { "use_nonce", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_use_nonce), "yes" },
 972         { "timeout", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, ocsp_timeout), "yes" },
 973         { "softfail", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_softfail), "no" },
 974         CONF_PARSER_TERMINATOR
 975 };
 976 #endif
 977
 978 static CONF_PARSER tls_server_config[] = {
 979         { "rsa_key_exchange", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, rsa_key), "no" },
 980         { "dh_key_exchange", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, dh_key), "yes" },
 981         { "rsa_key_length", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, rsa_key_length), "512" },
 982         { "dh_key_length", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, dh_key_length), "512" },
 983         { "verify_depth", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, verify_depth), "0" },
 984         { "CA_path", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT | PW_TYPE_DEPRECATED, fr_tls_server_conf_t, ca_path), NULL },
 985         { "ca_path", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_path), NULL },
 986         { "pem_file_type", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, file_type), "yes" },
 987         { "private_key_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, private_key_file), NULL },
 988         { "certificate_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, certificate_file), NULL },
 989         { "CA_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT | PW_TYPE_DEPRECATED, fr_tls_server_conf_t, ca_file), NULL },
 990         { "ca_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_file), NULL },
 991         { "private_key_password", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_SECRET, fr_tls_server_conf_t, private_key_password), NULL },
 992 #ifdef PSK_MAX_IDENTITY_LEN
 993         { "psk_identity", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, psk_identity), NULL },
 994         { "psk_hexphrase", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_SECRET, fr_tls_server_conf_t, psk_password), NULL },
 995         { "psk_query", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, psk_query), NULL },
 996 #endif
 997         { "dh_file", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, dh_file), NULL },
 998         { "random_file", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, random_file), NULL },
 999         { "fragment_size", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, fragment_size), "1024" },
1000         { "include_length", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, include_length), "yes" },
1001         { "check_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, check_crl), "no" },
1002 #ifdef X509_V_FLAG_CRL_CHECK_ALL
1003         { "check_all_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, check_all_crl), "no" },
1004 #endif
1005         { "allow_expired_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, allow_expired_crl), NULL },
1006         { "check_cert_cn", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_cn), NULL },
1007         { "cipher_list", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, cipher_list), NULL },
1008         { "check_cert_issuer", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_issuer), NULL },
1009         { "require_client_cert", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, require_client_cert), NULL },
1010
1011 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
1012 #ifndef OPENSSL_NO_ECDH
1013         { "ecdh_curve", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, ecdh_curve), "prime256v1" },
1014 #endif
1015 #endif
1016
1017 #ifdef SSL_OP_NO_TLSv1
1018         { "disable_tlsv1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1), NULL },
1019 #endif
1020
1021 #ifdef SSL_OP_NO_TLSv1_1
1022         { "disable_tlsv1_1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_1), NULL },
1023 #endif
1024
1025 #ifdef SSL_OP_NO_TLSv1_2
1026         { "disable_tlsv1_2", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_2), NULL },
1027 #endif
1028
1029         { "cache", FR_CONF_POINTER(PW_TYPE_SUBSECTION, NULL), (void const *) cache_config },
1030
1031         { "verify", FR_CONF_POINTER(PW_TYPE_SUBSECTION, NULL), (void const *) verify_config },
1032
1033 #ifdef HAVE_OPENSSL_OCSP_H
1034         { "ocsp", FR_CONF_POINTER(PW_TYPE_SUBSECTION, NULL), (void const *) ocsp_config },
1035 #endif
1036         CONF_PARSER_TERMINATOR
1037 };
1038
1039
1040 static CONF_PARSER tls_client_config[] = {
1041         { "rsa_key_exchange", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, rsa_key), "no" },
1042         { "dh_key_exchange", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, dh_key), "yes" },
1043         { "rsa_key_length", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, rsa_key_length), "512" },
1044         { "dh_key_length", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, dh_key_length), "512" },
1045         { "verify_depth", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, verify_depth), "0" },
1046         { "ca_path", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_path), NULL },
1047         { "pem_file_type", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, file_type), "yes" },
1048         { "private_key_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, private_key_file), NULL },
1049         { "certificate_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, certificate_file), NULL },
1050         { "ca_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_file), NULL },
1051         { "private_key_password", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_SECRET, fr_tls_server_conf_t, private_key_password), NULL },
1052         { "dh_file", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, dh_file), NULL },
1053         { "random_file", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, random_file), NULL },
1054         { "fragment_size", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, fragment_size), "1024" },
1055         { "include_length", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, include_length), "yes" },
1056         { "check_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, check_crl), "no" },
1057         { "check_cert_cn", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_cn), NULL },
1058         { "cipher_list", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, cipher_list), NULL },
1059         { "check_cert_issuer", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_issuer), NULL },
1060
1061 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
1062 #ifndef OPENSSL_NO_ECDH
1063         { "ecdh_curve", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, ecdh_curve), "prime256v1" },
1064 #endif
1065 #endif
1066
1067 #ifdef SSL_OP_NO_TLSv1
1068         { "disable_tlsv1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1), NULL },
1069 #endif
1070
1071 #ifdef SSL_OP_NO_TLSv1_1
1072         { "disable_tlsv1_1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_1), NULL },
1073 #endif
1074
1075 #ifdef SSL_OP_NO_TLSv1_2
1076         { "disable_tlsv1_2", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_2), NULL },
1077 #endif
1078         CONF_PARSER_TERMINATOR
1079 };
1080
1081
1082 /*
1083  *      TODO: Check for the type of key exchange * like conf->dh_key
1084  */
1085 static int load_dh_params(SSL_CTX *ctx, char *file)
1086 {
1087         DH *dh = NULL;
1088         BIO *bio;
1089
1090         if (!file) return 0;
1091
1092         if ((bio = BIO_new_file(file, "r")) == NULL) {
1093                 ERROR(LOG_PREFIX ": Unable to open DH file - %s", file);
1094                 return -1;
1095         }
1096
1097         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
1098         BIO_free(bio);
1099         if (!dh) {
1100                 WARN(LOG_PREFIX ": Unable to set DH parameters.  DH cipher suites may not work!");
1101                 WARN(LOG_PREFIX ": Fix this by running the OpenSSL command listed in eap.conf");
1102                 return 0;
1103         }
1104
1105         if (SSL_CTX_set_tmp_dh(ctx, dh) < 0) {
1106                 ERROR(LOG_PREFIX ": Unable to set DH parameters");
1107                 DH_free(dh);
1108                 return -1;
1109         }
1110
1111         DH_free(dh);
1112         return 0;
1113 }
1114
1115
1116 /*
1117  *      Print debugging messages, and free data.
1118  */
1119 #define MAX_SESSION_SIZE (256)
1120
1121 static void cbtls_remove_session(SSL_CTX *ctx, SSL_SESSION *sess)
1122 {
1123         size_t                  size;
1124         char                    buffer[2 * MAX_SESSION_SIZE + 1];
1125         fr_tls_server_conf_t    *conf;
1126
1127         size = sess->session_id_length;
1128         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
1129
1130         fr_bin2hex(buffer, sess->session_id, size);
1131
1132         conf = (fr_tls_server_conf_t *)SSL_CTX_get_app_data(ctx);
1133         if (!conf) {
1134                 DEBUG(LOG_PREFIX ": Failed to find TLS configuration in session");
1135                 return;
1136         }
1137
1138         {
1139                 int rv;
1140                 char filename[256];
1141
1142                 DEBUG2(LOG_PREFIX ": Removing session %s from the cache", buffer);
1143
1144                 /* remove session and any cached VPs */
1145                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
1146                          conf->session_cache_path, FR_DIR_SEP, buffer);
1147                 rv = unlink(filename);
1148                 if (rv != 0) {
1149                         DEBUG2(LOG_PREFIX ": Could not remove persisted session file %s: %s",
1150                                filename, fr_syserror(errno));
1151                 }
1152                 /* VPs might be absent; might not have been written to disk yet */
1153                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
1154                          conf->session_cache_path, FR_DIR_SEP, buffer);
1155                 unlink(filename);
1156         }
1157
1158         return;
1159 }
1160
1161 static int cbtls_new_session(SSL *ssl, SSL_SESSION *sess)
1162 {
1163         size_t                  size;
1164         char                    buffer[2 * MAX_SESSION_SIZE + 1];
1165         fr_tls_server_conf_t    *conf;
1166         unsigned char           *sess_blob = NULL;
1167
1168         REQUEST                 *request = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
1169
1170         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1171         if (!conf) {
1172                 RWDEBUG("Failed to find TLS configuration in session");
1173                 return 0;
1174         }
1175
1176         size = sess->session_id_length;
1177         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
1178
1179         fr_bin2hex(buffer, sess->session_id, size);
1180
1181         {
1182                 int fd, rv, todo, blob_len;
1183                 char filename[256];
1184                 unsigned char *p;
1185
1186                 RDEBUG2("Serialising session %s, and storing in cache", buffer);
1187
1188                 /* find out what length data we need */
1189                 blob_len = i2d_SSL_SESSION(sess, NULL);
1190                 if (blob_len < 1) {
1191                         /* something went wrong */
1192                         RWDEBUG("Session serialisation failed, couldn't determine required buffer length");
1193                         return 0;
1194                 }
1195
1196
1197                 /* Do not convert to TALLOC - Thread safety */
1198                 /* alloc and convert to ASN.1 */
1199                 sess_blob = malloc(blob_len);
1200                 if (!sess_blob) {
1201                         RWDEBUG("Session serialisation failed, couldn't allocate buffer (%d bytes)", blob_len);
1202                         return 0;
1203                 }
1204                 /* openssl mutates &p */
1205                 p = sess_blob;
1206                 rv = i2d_SSL_SESSION(sess, &p);
1207                 if (rv != blob_len) {
1208                         RWDEBUG("Session serialisation failed");
1209                         goto error;
1210                 }
1211
1212                 /* open output file */
1213                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
1214                          conf->session_cache_path, FR_DIR_SEP, buffer);
1215                 fd = open(filename, O_RDWR|O_CREAT|O_EXCL, 0600);
1216                 if (fd < 0) {
1217                         RERROR("Session serialisation failed, failed opening session file %s: %s",
1218                               filename, fr_syserror(errno));
1219                         goto error;
1220                 }
1221
1222                 todo = blob_len;
1223                 p = sess_blob;
1224                 while (todo > 0) {
1225                         rv = write(fd, p, todo);
1226                         if (rv < 1) {
1227                                 RWDEBUG("Failed writing session: %s", fr_syserror(errno));
1228                                 close(fd);
1229                                 goto error;
1230                         }
1231                         p += rv;
1232                         todo -= rv;
1233                 }
1234                 close(fd);
1235                 RWDEBUG("Wrote session %s to %s (%d bytes)", buffer, filename, blob_len);
1236         }
1237
1238 error:
1239         free(sess_blob);
1240
1241         return 0;
1242 }
1243
1244 static SSL_SESSION *cbtls_get_session(SSL *ssl, unsigned char *data, int len, int *copy)
1245 {
1246         size_t                  size;
1247         char                    buffer[2 * MAX_SESSION_SIZE + 1];
1248         fr_tls_server_conf_t    *conf;
1249         TALLOC_CTX              *talloc_ctx;
1250
1251         SSL_SESSION             *sess = NULL;
1252         unsigned char           *sess_data = NULL;
1253         PAIR_LIST               *pairlist = NULL;
1254
1255         REQUEST                 *request = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
1256
1257         rad_assert(request != NULL);
1258
1259         size = len;
1260         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
1261
1262         fr_bin2hex(buffer, data, size);
1263
1264         RDEBUG2("Peer requested cached session: %s", buffer);
1265
1266         *copy = 0;
1267
1268         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1269         if (!conf) {
1270                 RWDEBUG("Failed to find TLS configuration in session");
1271                 return NULL;
1272         }
1273
1274         talloc_ctx = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_TALLOC);
1275
1276         {
1277                 int             rv, fd, todo;
1278                 char            filename[256];
1279                 unsigned char   *p;
1280                 struct stat     st;
1281                 VALUE_PAIR      *vps = NULL;
1282
1283                 /* read in the cached VPs from the .vps file */
1284                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
1285                          conf->session_cache_path, FR_DIR_SEP, buffer);
1286                 rv = pairlist_read(talloc_ctx, filename, &pairlist, 1);
1287                 if (rv < 0) {
1288                         /* not safe to un-persist a session w/o VPs */
1289                         RWDEBUG("Failed loading persisted VPs for session %s", buffer);
1290                         goto err;
1291                 }
1292
1293                 /* load the actual SSL session */
1294                 snprintf(filename, sizeof(filename), "%s%c%s.asn1", conf->session_cache_path, FR_DIR_SEP, buffer);
1295                 fd = open(filename, O_RDONLY);
1296                 if (fd < 0) {
1297                         RWDEBUG("No persisted session file %s: %s", filename, fr_syserror(errno));
1298                         goto err;
1299                 }
1300
1301                 rv = fstat(fd, &st);
1302                 if (rv < 0) {
1303                         RWDEBUG("Failed stating persisted session file %s: %s", filename, fr_syserror(errno));
1304                         close(fd);
1305                         goto err;
1306                 }
1307
1308                 sess_data = talloc_array(NULL, unsigned char, st.st_size);
1309                 if (!sess_data) {
1310                         RWDEBUG("Failed allocating buffer for persisted session (%d bytes)", (int) st.st_size);
1311                         close(fd);
1312                         goto err;
1313                 }
1314
1315                 p = sess_data;
1316                 todo = st.st_size;
1317                 while (todo > 0) {
1318                         rv = read(fd, p, todo);
1319                         if (rv < 1) {
1320                                 RWDEBUG("Failed reading persisted session: %s", fr_syserror(errno));
1321                                 close(fd);
1322                                 goto err;
1323                         }
1324                         todo -= rv;
1325                         p += rv;
1326                 }
1327                 close(fd);
1328
1329                 /* openssl mutates &p */
1330                 p = sess_data;
1331                 sess = d2i_SSL_SESSION(NULL, (unsigned char const **)(void **) &p, st.st_size);
1332
1333                 if (!sess) {
1334                         RWDEBUG("Failed loading persisted session: %s", ERR_error_string(ERR_get_error(), NULL));
1335                         goto err;
1336                 }
1337
1338                 /* move the cached VPs into the session */
1339                 fr_pair_list_mcopy_by_num(talloc_ctx, &vps, &pairlist->reply, 0, 0, TAG_ANY);
1340
1341                 SSL_SESSION_set_ex_data(sess, fr_tls_ex_index_vps, vps);
1342                 RWDEBUG("Successfully restored session %s", buffer);
1343                 rdebug_pair_list(L_DBG_LVL_2, request, vps, "reply:");
1344         }
1345 err:
1346         if (sess_data) talloc_free(sess_data);
1347         if (pairlist) pairlist_free(&pairlist);
1348
1349         return sess;
1350 }
1351
1352 #ifdef HAVE_OPENSSL_OCSP_H
1353
1354 /** Extract components of OCSP responser URL from a certificate
1355  *
1356  * @param[in] cert to extract URL from.
1357  * @param[out] host_out Portion of the URL (must be freed with free()).
1358  * @param[out] port_out Port portion of the URL (must be freed with free()).
1359  * @param[out] path_out Path portion of the URL (must be freed with free()).
1360  * @param[out] is_https Whether the responder should be contacted using https.
1361  * @return
1362  *      - 0 if no valid URL is contained in the certificate.
1363  *      - 1 if a URL was found and parsed.
1364  *      - -1 if at least one URL was found, but none could be parsed.
1365  */
1366 static int ocsp_parse_cert_url(X509 *cert, char **host_out, char **port_out,
1367                                char **path_out, int *is_https)
1368 {
1369         int                     i;
1370         bool                    found_uri = false;
1371
1372         AUTHORITY_INFO_ACCESS   *aia;
1373         ACCESS_DESCRIPTION      *ad;
1374
1375         aia = X509_get_ext_d2i(cert, NID_info_access, NULL, NULL);
1376
1377         for (i = 0; i < sk_ACCESS_DESCRIPTION_num(aia); i++) {
1378                 ad = sk_ACCESS_DESCRIPTION_value(aia, i);
1379                 if (OBJ_obj2nid(ad->method) != NID_ad_OCSP) continue;
1380                 if (ad->location->type != GEN_URI) continue;
1381                 found_uri = true;
1382
1383                 if (OCSP_parse_url((char *) ad->location->d.ia5->data, host_out,
1384                                    port_out, path_out, is_https)) return 1;
1385         }
1386         return found_uri ? -1 : 0;
1387 }
1388
1389 /*
1390  * This function sends a OCSP request to a defined OCSP responder
1391  * and checks the OCSP response for correctness.
1392  */
1393
1394 /* Maximum leeway in validity period: default 5 minutes */
1395 #define MAX_VALIDITY_PERIOD     (5 * 60)
1396
1397 static int ocsp_check(REQUEST *request, X509_STORE *store, X509 *issuer_cert, X509 *client_cert,
1398                       fr_tls_server_conf_t *conf)
1399 {
1400         OCSP_CERTID     *certid;
1401         OCSP_REQUEST    *req;
1402         OCSP_RESPONSE   *resp = NULL;
1403         OCSP_BASICRESP  *bresp = NULL;
1404         char            *host = NULL;
1405         char            *port = NULL;
1406         char            *path = NULL;
1407         char            hostheader[1024];
1408         int             use_ssl = -1;
1409         long            nsec = MAX_VALIDITY_PERIOD, maxage = -1;
1410         BIO             *cbio, *bio_out;
1411         int             ocsp_ok = 0;
1412         int             status;
1413         ASN1_GENERALIZEDTIME *rev, *thisupd, *nextupd;
1414         int             reason;
1415 #if OPENSSL_VERSION_NUMBER >= 0x1000003f
1416         OCSP_REQ_CTX    *ctx;
1417         int             rc;
1418         struct timeval  now;
1419         struct timeval  when;
1420 #endif
1421
1422         /*
1423          * Create OCSP Request
1424          */
1425         certid = OCSP_cert_to_id(NULL, client_cert, issuer_cert);
1426         req = OCSP_REQUEST_new();
1427         OCSP_request_add0_id(req, certid);
1428         if (conf->ocsp_use_nonce) OCSP_request_add1_nonce(req, NULL, 8);
1429
1430         /*
1431          * Send OCSP Request and get OCSP Response
1432          */
1433
1434         /* Get OCSP responder URL */
1435         if (conf->ocsp_override_url) {
1436                 char *url;
1437
1438         use_ocsp_url:
1439                 memcpy(&url, &conf->ocsp_url, sizeof(url));
1440                 /* Reading the libssl src, they do a strdup on the URL, so it could of been const *sigh* */
1441                 OCSP_parse_url(url, &host, &port, &path, &use_ssl);
1442                 if (!host || !port || !path) {
1443                         RWDEBUG("ocsp: Host or port or path missing from configured URL \"%s\".  Not doing OCSP", url);
1444                         goto skipped;
1445                 }
1446         } else {
1447                 int ret;
1448
1449                 ret = ocsp_parse_cert_url(client_cert, &host, &port, &path, &use_ssl);
1450                 switch (ret) {
1451                 case -1:
1452                         RWDEBUG("ocsp: Invalid URL in certificate.  Not doing OCSP");
1453                         break;
1454
1455                 case 0:
1456                         if (conf->ocsp_url) {
1457                                 RWDEBUG("ocsp: No OCSP URL in certificate, falling back to configured URL");
1458                                 goto use_ocsp_url;
1459                         }
1460                         RWDEBUG("ocsp: No OCSP URL in certificate.  Not doing OCSP");
1461                         goto skipped;
1462
1463                 case 1:
1464                         break;
1465                 }
1466         }
1467
1468         RDEBUG2("ocsp: Using responder URL \"http://%s:%s%s\"", host, port, path);
1469
1470         /* Check host and port length are sane, then create Host: HTTP header */
1471         if ((strlen(host) + strlen(port) + 2) > sizeof(hostheader)) {
1472                 RWDEBUG("ocsp: Host and port too long");
1473                 goto ocsp_skip;
1474         }
1475         snprintf(hostheader, sizeof(hostheader), "%s:%s", host, port);
1476
1477         /* Setup BIO socket to OCSP responder */
1478         cbio = BIO_new_connect(host);
1479
1480         bio_out = NULL;
1481         if (rad_debug_lvl) {
1482                 if (default_log.dst == L_DST_STDOUT) {
1483                         bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
1484                 } else if (default_log.dst == L_DST_STDERR) {
1485                         bio_out = BIO_new_fp(stderr, BIO_NOCLOSE);
1486                 }
1487         }
1488
1489         BIO_set_conn_port(cbio, port);
1490 #if OPENSSL_VERSION_NUMBER < 0x1000003f
1491         BIO_do_connect(cbio);
1492
1493         /* Send OCSP request and wait for response */
1494         resp = OCSP_sendreq_bio(cbio, path, req);
1495         if (!resp) {
1496                 REDEBUG("ocsp: Couldn't get OCSP response");
1497                 ocsp_ok = 2;
1498                 goto ocsp_end;
1499         }
1500 #else
1501         if (conf->ocsp_timeout)
1502                 BIO_set_nbio(cbio, 1);
1503
1504         rc = BIO_do_connect(cbio);
1505         if ((rc <= 0) && ((!conf->ocsp_timeout) || !BIO_should_retry(cbio))) {
1506                 REDEBUG("ocsp: Couldn't connect to OCSP responder");
1507                 ocsp_ok = 2;
1508                 goto ocsp_end;
1509         }
1510
1511         ctx = OCSP_sendreq_new(cbio, path, NULL, -1);
1512         if (!ctx) {
1513                 REDEBUG("ocsp: Couldn't create OCSP request");
1514                 ocsp_ok = 2;
1515                 goto ocsp_end;
1516         }
1517
1518         if (!OCSP_REQ_CTX_add1_header(ctx, "Host", hostheader)) {
1519                 REDEBUG("ocsp: Couldn't set Host header");
1520                 ocsp_ok = 2;
1521                 goto ocsp_end;
1522         }
1523
1524         if (!OCSP_REQ_CTX_set1_req(ctx, req)) {
1525                 REDEBUG("ocsp: Couldn't add data to OCSP request");
1526                 ocsp_ok = 2;
1527                 goto ocsp_end;
1528         }
1529
1530         gettimeofday(&when, NULL);
1531         when.tv_sec += conf->ocsp_timeout;
1532
1533         do {
1534                 rc = OCSP_sendreq_nbio(&resp, ctx);
1535                 if (conf->ocsp_timeout) {
1536                         gettimeofday(&now, NULL);
1537                         if (!timercmp(&now, &when, <))
1538                                 break;
1539                 }
1540         } while ((rc == -1) && BIO_should_retry(cbio));
1541
1542         if (conf->ocsp_timeout && (rc == -1) && BIO_should_retry(cbio)) {
1543                 REDEBUG("ocsp: Response timed out");
1544                 ocsp_ok = 2;
1545                 goto ocsp_end;
1546         }
1547
1548         OCSP_REQ_CTX_free(ctx);
1549
1550         if (rc == 0) {
1551                 REDEBUG("ocsp: Couldn't get OCSP response");
1552                 ocsp_ok = 2;
1553                 goto ocsp_end;
1554         }
1555 #endif
1556
1557         /* Verify OCSP response status */
1558         status = OCSP_response_status(resp);
1559         if (status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
1560                 REDEBUG("ocsp: Response status: %s", OCSP_response_status_str(status));
1561                 goto ocsp_end;
1562         }
1563         bresp = OCSP_response_get1_basic(resp);
1564         if (conf->ocsp_use_nonce && OCSP_check_nonce(req, bresp)!=1) {
1565                 REDEBUG("ocsp: Response has wrong nonce value");
1566                 goto ocsp_end;
1567         }
1568         if (OCSP_basic_verify(bresp, NULL, store, 0)!=1){
1569                 REDEBUG("ocsp: Couldn't verify OCSP basic response");
1570                 goto ocsp_end;
1571         }
1572
1573         /*      Verify OCSP cert status */
1574         if (!OCSP_resp_find_status(bresp, certid, &status, &reason, &rev, &thisupd, &nextupd)) {
1575                 REDEBUG("ocsp: No Status found");
1576                 goto ocsp_end;
1577         }
1578
1579         if (!OCSP_check_validity(thisupd, nextupd, nsec, maxage)) {
1580                 if (bio_out) {
1581                         BIO_puts(bio_out, "WARNING: Status times invalid.\n");
1582                         ERR_print_errors(bio_out);
1583                 }
1584                 goto ocsp_end;
1585         }
1586
1587         if (bio_out) {
1588                 BIO_puts(bio_out, "\tThis Update: ");
1589                 ASN1_GENERALIZEDTIME_print(bio_out, thisupd);
1590                 BIO_puts(bio_out, "\n");
1591                 if (nextupd) {
1592                         BIO_puts(bio_out, "\tNext Update: ");
1593                         ASN1_GENERALIZEDTIME_print(bio_out, nextupd);
1594                         BIO_puts(bio_out, "\n");
1595                 }
1596         }
1597
1598         switch (status) {
1599         case V_OCSP_CERTSTATUS_GOOD:
1600                 RDEBUG2("ocsp: Cert status: good");
1601                 ocsp_ok = 1;
1602                 break;
1603
1604         default:
1605                 /* REVOKED / UNKNOWN */
1606                 REDEBUG("ocsp: Cert status: %s", OCSP_cert_status_str(status));
1607                 if (reason != -1) REDEBUG("ocsp: Reason: %s", OCSP_crl_reason_str(reason));
1608
1609                 if (bio_out) {
1610                         BIO_puts(bio_out, "\tRevocation Time: ");
1611                         ASN1_GENERALIZEDTIME_print(bio_out, rev);
1612                         BIO_puts(bio_out, "\n");
1613                 }
1614                 break;
1615         }
1616
1617 ocsp_end:
1618         /* Free OCSP Stuff */
1619         OCSP_REQUEST_free(req);
1620         OCSP_RESPONSE_free(resp);
1621         free(host);
1622         free(port);
1623         free(path);
1624         BIO_free_all(cbio);
1625         if (bio_out) BIO_free(bio_out);
1626         OCSP_BASICRESP_free(bresp);
1627
1628  ocsp_skip:
1629         switch (ocsp_ok) {
1630         case 1:
1631                 RDEBUG2("ocsp: Certificate is valid");
1632                 break;
1633
1634         case 2:
1635                 if (conf->ocsp_softfail) {
1636                         RWDEBUG("ocsp: Unable to check certificate, assuming it's valid");
1637                         RWDEBUG("ocsp: This may be insecure");
1638                         ocsp_ok = 1;
1639                 } else {
1640                         REDEBUG("ocsp: Unable to check certificate, failing");
1641                         ocsp_ok = 0;
1642                 }
1643                 break;
1644
1645         default:
1646                 REDEBUG("ocsp: Certificate has been expired/revoked");
1647                 break;
1648         }
1649
1650         return ocsp_ok;
1651 }
1652 #endif  /* HAVE_OPENSSL_OCSP_H */
1653
1654 /*
1655  *      For creating certificate attributes.
1656  */
1657 static char const *cert_attr_names[8][2] = {
1658         { "TLS-Client-Cert-Serial",                     "TLS-Cert-Serial" },
1659         { "TLS-Client-Cert-Expiration",                 "TLS-Cert-Expiration" },
1660         { "TLS-Client-Cert-Subject",                    "TLS-Cert-Subject" },
1661         { "TLS-Client-Cert-Issuer",                     "TLS-Cert-Issuer" },
1662         { "TLS-Client-Cert-Common-Name",                "TLS-Cert-Common-Name" },
1663         { "TLS-Client-Cert-Subject-Alt-Name-Email",     "TLS-Cert-Subject-Alt-Name-Email" },
1664         { "TLS-Client-Cert-Subject-Alt-Name-Dns",       "TLS-Cert-Subject-Alt-Name-Dns" },
1665         { "TLS-Client-Cert-Subject-Alt-Name-Upn",       "TLS-Cert-Subject-Alt-Name-Upn" }
1666 };
1667
1668 #define FR_TLS_SERIAL           (0)
1669 #define FR_TLS_EXPIRATION       (1)
1670 #define FR_TLS_SUBJECT          (2)
1671 #define FR_TLS_ISSUER           (3)
1672 #define FR_TLS_CN               (4)
1673 #define FR_TLS_SAN_EMAIL        (5)
1674 #define FR_TLS_SAN_DNS          (6)
1675 #define FR_TLS_SAN_UPN          (7)
1676
1677 /*
1678  *      Before trusting a certificate, you must make sure that the
1679  *      certificate is 'valid'. There are several steps that your
1680  *      application can take in determining if a certificate is
1681  *      valid. Commonly used steps are:
1682  *
1683  *      1.Verifying the certificate's signature, and verifying that
1684  *      the certificate has been issued by a trusted Certificate
1685  *      Authority.
1686  *
1687  *      2.Verifying that the certificate is valid for the present date
1688  *      (i.e. it is being presented within its validity dates).
1689  *
1690  *      3.Verifying that the certificate has not been revoked by its
1691  *      issuing Certificate Authority, by checking with respect to a
1692  *      Certificate Revocation List (CRL).
1693  *
1694  *      4.Verifying that the credentials presented by the certificate
1695  *      fulfill additional requirements specific to the application,
1696  *      such as with respect to access control lists or with respect
1697  *      to OCSP (Online Certificate Status Processing).
1698  *
1699  *      NOTE: This callback will be called multiple times based on the
1700  *      depth of the root certificate chain
1701  */
1702 int cbtls_verify(int ok, X509_STORE_CTX *ctx)
1703 {
1704         char            subject[1024]; /* Used for the subject name */
1705         char            issuer[1024]; /* Used for the issuer name */
1706         char            attribute[1024];
1707         char            value[1024];
1708         char            common_name[1024];
1709         char            cn_str[1024];
1710         char            buf[64];
1711         X509            *client_cert;
1712         X509_CINF       *client_inf;
1713         STACK_OF(X509_EXTENSION) *ext_list;
1714         SSL             *ssl;
1715         int             err, depth, lookup, loc;
1716         fr_tls_server_conf_t *conf;
1717         int             my_ok = ok;
1718
1719         ASN1_INTEGER    *sn = NULL;
1720         ASN1_TIME       *asn_time = NULL;
1721         VALUE_PAIR      **certs;
1722         char **identity;
1723 #ifdef HAVE_OPENSSL_OCSP_H
1724         X509_STORE      *ocsp_store = NULL;
1725         X509            *issuer_cert;
1726 #endif
1727         VALUE_PAIR      *vp;
1728         TALLOC_CTX      *talloc_ctx;
1729
1730         REQUEST         *request;
1731
1732         client_cert = X509_STORE_CTX_get_current_cert(ctx);
1733         err = X509_STORE_CTX_get_error(ctx);
1734         depth = X509_STORE_CTX_get_error_depth(ctx);
1735
1736         lookup = depth;
1737
1738         /*
1739          *      Log client/issuing cert.  If there's an error, log
1740          *      issuing cert.
1741          */
1742         if ((lookup > 1) && !my_ok) lookup = 1;
1743
1744         /*
1745          * Retrieve the pointer to the SSL of the connection currently treated
1746          * and the application specific data stored into the SSL object.
1747          */
1748         ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
1749         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1750         if (!conf) return 1;
1751
1752         request = (REQUEST *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
1753         rad_assert(request != NULL);
1754         certs = (VALUE_PAIR **)SSL_get_ex_data(ssl, fr_tls_ex_index_certs);
1755
1756         identity = (char **)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_IDENTITY);
1757 #ifdef HAVE_OPENSSL_OCSP_H
1758         ocsp_store = (X509_STORE *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_STORE);
1759 #endif
1760
1761         talloc_ctx = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_TALLOC);
1762
1763         /*
1764          *      Get the Serial Number
1765          */
1766         buf[0] = '\0';
1767         sn = X509_get_serialNumber(client_cert);
1768
1769         RDEBUG2("Creating attributes from certificate OIDs");
1770         RINDENT();
1771
1772         /*
1773          *      For this next bit, we create the attributes *only* if
1774          *      we're at the client or issuing certificate, AND we
1775          *      have a user identity.  i.e. we don't create the
1776          *      attributes for RadSec connections.
1777          */
1778         if (certs && identity &&
1779             (lookup <= 1) && sn && ((size_t) sn->length < (sizeof(buf) / 2))) {
1780                 char *p = buf;
1781                 int i;
1782
1783                 for (i = 0; i < sn->length; i++) {
1784                         sprintf(p, "%02x", (unsigned int)sn->data[i]);
1785                         p += 2;
1786                 }
1787                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SERIAL][lookup], buf, T_OP_SET);
1788                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
1789         }
1790
1791
1792         /*
1793          *      Get the Expiration Date
1794          */
1795         buf[0] = '\0';
1796         asn_time = X509_get_notAfter(client_cert);
1797         if (certs && identity && (lookup <= 1) && asn_time &&
1798             (asn_time->length < (int) sizeof(buf))) {
1799                 memcpy(buf, (char*) asn_time->data, asn_time->length);
1800                 buf[asn_time->length] = '\0';
1801                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_EXPIRATION][lookup], buf, T_OP_SET);
1802                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
1803         }
1804
1805         /*
1806          *      Get the Subject & Issuer
1807          */
1808         subject[0] = issuer[0] = '\0';
1809         X509_NAME_oneline(X509_get_subject_name(client_cert), subject,
1810                           sizeof(subject));
1811         subject[sizeof(subject) - 1] = '\0';
1812         if (certs && identity && (lookup <= 1) && subject[0]) {
1813                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SUBJECT][lookup], subject, T_OP_SET);
1814                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
1815         }
1816
1817         X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), issuer,
1818                           sizeof(issuer));
1819         issuer[sizeof(issuer) - 1] = '\0';
1820         if (certs && identity && (lookup <= 1) && issuer[0]) {
1821                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_ISSUER][lookup], issuer, T_OP_SET);
1822                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
1823         }
1824
1825         /*
1826          *      Get the Common Name, if there is a subject.
1827          */
1828         X509_NAME_get_text_by_NID(X509_get_subject_name(client_cert),
1829                                   NID_commonName, common_name, sizeof(common_name));
1830         common_name[sizeof(common_name) - 1] = '\0';
1831         if (certs && identity && (lookup <= 1) && common_name[0] && subject[0]) {
1832                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_CN][lookup], common_name, T_OP_SET);
1833                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
1834         }
1835
1836         /*
1837          *      Get the RFC822 Subject Alternative Name
1838          */
1839         loc = X509_get_ext_by_NID(client_cert, NID_subject_alt_name, 0);
1840         if (certs && (lookup <= 1) && (loc >= 0)) {
1841                 X509_EXTENSION *ext = NULL;
1842                 GENERAL_NAMES *names = NULL;
1843                 int i;
1844
1845                 if ((ext = X509_get_ext(client_cert, loc)) &&
1846                     (names = X509V3_EXT_d2i(ext))) {
1847                         for (i = 0; i < sk_GENERAL_NAME_num(names); i++) {
1848                                 GENERAL_NAME *name = sk_GENERAL_NAME_value(names, i);
1849
1850                                 switch (name->type) {
1851 #ifdef GEN_EMAIL
1852                                 case GEN_EMAIL:
1853                                         vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SAN_EMAIL][lookup],
1854                                                       (char *) ASN1_STRING_data(name->d.rfc822Name), T_OP_SET);
1855                                         rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
1856                                         break;
1857 #endif  /* GEN_EMAIL */
1858 #ifdef GEN_DNS
1859                                 case GEN_DNS:
1860                                         vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SAN_DNS][lookup],
1861                                                       (char *) ASN1_STRING_data(name->d.dNSName), T_OP_SET);
1862                                         rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
1863                                         break;
1864 #endif  /* GEN_DNS */
1865 #ifdef GEN_OTHERNAME
1866                                 case GEN_OTHERNAME:
1867                                         /* look for a MS UPN */
1868                                         if (NID_ms_upn == OBJ_obj2nid(name->d.otherName->type_id)) {
1869                                             /* we've got a UPN - Must be ASN1-encoded UTF8 string */
1870                                             if (name->d.otherName->value->type == V_ASN1_UTF8STRING) {
1871                                                     vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SAN_UPN][lookup],
1872                                                                   (char *) ASN1_STRING_data(name->d.otherName->value->value.utf8string), T_OP_SET);
1873                                                     rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
1874                                                 break;
1875                                             } else {
1876                                                 RWARN("Invalid UPN in Subject Alt Name (should be UTF-8)");
1877                                                 break;
1878                                             }
1879                                         }
1880                                         break;
1881 #endif  /* GEN_OTHERNAME */
1882                                 default:
1883                                         /* XXX TODO handle other SAN types */
1884                                         break;
1885                                 }
1886                         }
1887                 }
1888                 if (names != NULL)
1889                         sk_GENERAL_NAME_free(names);
1890         }
1891
1892         /*
1893          *      If the CRL has expired, that might still be OK.
1894          */
1895         if (!my_ok &&
1896             (conf->allow_expired_crl) &&
1897             (err == X509_V_ERR_CRL_HAS_EXPIRED)) {
1898                 my_ok = 1;
1899                 X509_STORE_CTX_set_error( ctx, 0 );
1900         }
1901
1902         if (!my_ok) {
1903                 char const *p = X509_verify_cert_error_string(err);
1904                 RERROR("SSL says error %d : %s", err, p);
1905                 REXDENT();
1906                 return my_ok;
1907         }
1908
1909         if (lookup == 0) {
1910                 client_inf = client_cert->cert_info;
1911                 ext_list = client_inf->extensions;
1912         } else {
1913                 ext_list = NULL;
1914         }
1915
1916         /*
1917          *      Grab the X509 extensions, and create attributes out of them.
1918          *      For laziness, we re-use the OpenSSL names
1919          */
1920         if (certs && (sk_X509_EXTENSION_num(ext_list) > 0)) {
1921                 int i, len;
1922                 char *p;
1923                 BIO *out;
1924
1925                 out = BIO_new(BIO_s_mem());
1926                 strlcpy(attribute, "TLS-Client-Cert-", sizeof(attribute));
1927
1928                 for (i = 0; i < sk_X509_EXTENSION_num(ext_list); i++) {
1929                         ASN1_OBJECT *obj;
1930                         X509_EXTENSION *ext;
1931
1932                         ext = sk_X509_EXTENSION_value(ext_list, i);
1933
1934                         obj = X509_EXTENSION_get_object(ext);
1935                         i2a_ASN1_OBJECT(out, obj);
1936                         len = BIO_read(out, attribute + 16 , sizeof(attribute) - 16 - 1);
1937                         if (len <= 0) continue;
1938
1939                         attribute[16 + len] = '\0';
1940
1941                         for (p = attribute + 16; *p != '\0'; p++) {
1942                                 if (*p == ' ') *p = '-';
1943                         }
1944
1945                         X509V3_EXT_print(out, ext, 0, 0);
1946                         len = BIO_read(out, value , sizeof(value) - 1);
1947                         if (len <= 0) continue;
1948
1949                         value[len] = '\0';
1950
1951                         vp = fr_pair_make(talloc_ctx, certs, attribute, value, T_OP_ADD);
1952                         if (!vp) {
1953                                 RDEBUG3("Skipping %s += '%s'.  Please check that both the "
1954                                         "attribute and value are defined in the dictionaries",
1955                                         attribute, value);
1956                         } else {
1957                                 /*
1958                                  *      rdebug_pair_list indents (so pre REXDENT())
1959                                  */
1960                                 REXDENT();
1961                                 rdebug_pair_list(L_DBG_LVL_2, request, vp, NULL);
1962                                 RINDENT();
1963                         }
1964                 }
1965
1966                 BIO_free_all(out);
1967         }
1968
1969         REXDENT();
1970
1971         switch (ctx->error) {
1972         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
1973                 RERROR("issuer=%s", issuer);
1974                 break;
1975
1976         case X509_V_ERR_CERT_NOT_YET_VALID:
1977         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
1978                 RERROR("notBefore=");
1979 #if 0
1980                 ASN1_TIME_print(bio_err, X509_get_notBefore(ctx->current_cert));
1981 #endif
1982                 break;
1983
1984         case X509_V_ERR_CERT_HAS_EXPIRED:
1985         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
1986                 RERROR("notAfter=");
1987 #if 0
1988                 ASN1_TIME_print(bio_err, X509_get_notAfter(ctx->current_cert));
1989 #endif
1990                 break;
1991         }
1992
1993         /*
1994          *      If we're at the actual client cert, apply additional
1995          *      checks.
1996          */
1997         if (depth == 0) {
1998                 /*
1999                  *      If the conf tells us to, check cert issuer
2000                  *      against the specified value and fail
2001                  *      verification if they don't match.
2002                  */
2003                 if (conf->check_cert_issuer &&
2004                     (strcmp(issuer, conf->check_cert_issuer) != 0)) {
2005                         AUTH(LOG_PREFIX ": Certificate issuer (%s) does not match specified value (%s)!",
2006                              issuer, conf->check_cert_issuer);
2007                         my_ok = 0;
2008                 }
2009
2010                 /*
2011                  *      If the conf tells us to, check the CN in the
2012                  *      cert against xlat'ed value, but only if the
2013                  *      previous checks passed.
2014                  */
2015                 if (my_ok && conf->check_cert_cn) {
2016                         if (radius_xlat(cn_str, sizeof(cn_str), request, conf->check_cert_cn, NULL, NULL) < 0) {
2017                                 /* if this fails, fail the verification */
2018                                 my_ok = 0;
2019                         } else {
2020                                 RDEBUG2("checking certificate CN (%s) with xlat'ed value (%s)", common_name, cn_str);
2021                                 if (strcmp(cn_str, common_name) != 0) {
2022                                         AUTH(LOG_PREFIX ": Certificate CN (%s) does not match specified value (%s)!",
2023                                              common_name, cn_str);
2024                                         my_ok = 0;
2025                                 }
2026                         }
2027                 } /* check_cert_cn */
2028
2029 #ifdef HAVE_OPENSSL_OCSP_H
2030                 if (my_ok && conf->ocsp_enable){
2031                         RDEBUG2("Starting OCSP Request");
2032                         if (X509_STORE_CTX_get1_issuer(&issuer_cert, ctx, client_cert) != 1) {
2033                                 RERROR("Couldn't get issuer_cert for %s", common_name);
2034                         } else {
2035                                 my_ok = ocsp_check(request, ocsp_store, issuer_cert, client_cert, conf);
2036                         }
2037                 }
2038 #endif
2039
2040                 while (conf->verify_client_cert_cmd) {
2041                         char filename[256];
2042                         int fd;
2043                         FILE *fp;
2044
2045                         snprintf(filename, sizeof(filename), "%s/%s.client.XXXXXXXX",
2046                                  conf->verify_tmp_dir, progname);
2047                         fd = mkstemp(filename);
2048                         if (fd < 0) {
2049                                 RDEBUG("Failed creating file in %s: %s",
2050                                        conf->verify_tmp_dir, fr_syserror(errno));
2051                                 break;
2052                         }
2053
2054                         fp = fdopen(fd, "w");
2055                         if (!fp) {
2056                                 close(fd);
2057                                 RDEBUG("Failed opening file %s: %s",
2058                                        filename, fr_syserror(errno));
2059                                 break;
2060                         }
2061
2062                         if (!PEM_write_X509(fp, client_cert)) {
2063                                 fclose(fp);
2064                                 RDEBUG("Failed writing certificate to file");
2065                                 goto do_unlink;
2066                         }
2067                         fclose(fp);
2068
2069                         if (!pair_make_request("TLS-Client-Cert-Filename",
2070                                              filename, T_OP_SET)) {
2071                                 RDEBUG("Failed creating TLS-Client-Cert-Filename");
2072
2073                                 goto do_unlink;
2074                         }
2075
2076                         RDEBUG("Verifying client certificate: %s", conf->verify_client_cert_cmd);
2077                         if (radius_exec_program(request, NULL, 0, NULL, request, conf->verify_client_cert_cmd,
2078                                                 request->packet->vps,
2079                                                 true, true, EXEC_TIMEOUT) != 0) {
2080                                 AUTH(LOG_PREFIX ": Certificate CN (%s) fails external verification!", common_name);
2081                                 my_ok = 0;
2082                         } else {
2083                                 RDEBUG("Client certificate CN %s passed external validation", common_name);
2084                         }
2085
2086                 do_unlink:
2087                         unlink(filename);
2088                         break;
2089                 }
2090
2091
2092         } /* depth == 0 */
2093
2094         if (RDEBUG_ENABLED3) {
2095                 RDEBUG3("chain-depth   : %d", depth);
2096                 RDEBUG3("error         : %d", err);
2097
2098                 if (identity) RDEBUG3("identity      : %s", *identity);
2099                 RDEBUG3("common name   : %s", common_name);
2100                 RDEBUG3("subject       : %s", subject);
2101                 RDEBUG3("issuer        : %s", issuer);
2102                 RDEBUG3("verify return : %d", my_ok);
2103         }
2104         return my_ok;
2105 }
2106
2107
2108 #ifdef HAVE_OPENSSL_OCSP_H
2109 /*
2110  *      Create Global X509 revocation store and use it to verify
2111  *      OCSP responses
2112  *
2113  *      - Load the trusted CAs
2114  *      - Load the trusted issuer certificates
2115  */
2116 static X509_STORE *init_revocation_store(fr_tls_server_conf_t *conf)
2117 {
2118         X509_STORE *store = NULL;
2119
2120         store = X509_STORE_new();
2121
2122         /* Load the CAs we trust */
2123         if (conf->ca_file || conf->ca_path)
2124                 if(!X509_STORE_load_locations(store, conf->ca_file, conf->ca_path)) {
2125                         ERROR(LOG_PREFIX ": X509_STORE error %s", ERR_error_string(ERR_get_error(), NULL));
2126                         ERROR(LOG_PREFIX ": Error reading Trusted root CA list %s",conf->ca_file );
2127                         return NULL;
2128                 }
2129
2130 #ifdef X509_V_FLAG_CRL_CHECK
2131         if (conf->check_crl)
2132                 X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK);
2133 #endif
2134 #ifdef X509_V_FLAG_CRL_CHECK_ALL
2135         if (conf->check_all_crl)
2136                 X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK_ALL);
2137 #endif
2138         return store;
2139 }
2140 #endif  /* HAVE_OPENSSL_OCSP_H */
2141
2142 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
2143 #ifndef OPENSSL_NO_ECDH
2144 static int set_ecdh_curve(SSL_CTX *ctx, char const *ecdh_curve)
2145 {
2146         int      nid;
2147         EC_KEY  *ecdh;
2148
2149         if (!ecdh_curve || !*ecdh_curve) return 0;
2150
2151         nid = OBJ_sn2nid(ecdh_curve);
2152         if (!nid) {
2153                 ERROR(LOG_PREFIX ": Unknown ecdh_curve \"%s\"", ecdh_curve);
2154                 return -1;
2155         }
2156
2157         ecdh = EC_KEY_new_by_curve_name(nid);
2158         if (!ecdh) {
2159                 ERROR(LOG_PREFIX ": Unable to create new curve \"%s\"", ecdh_curve);
2160                 return -1;
2161         }
2162
2163         SSL_CTX_set_tmp_ecdh(ctx, ecdh);
2164
2165         SSL_CTX_set_options(ctx, SSL_OP_SINGLE_ECDH_USE);
2166
2167         EC_KEY_free(ecdh);
2168
2169         return 0;
2170 }
2171 #endif
2172 #endif
2173
2174 /*
2175  * DIE OPENSSL DIE DIE DIE
2176  *
2177  * What a palaver, just to free some data attached the
2178  * session. We need to do this because the "remove" callback
2179  * is called when refcount > 0 sometimes, if another thread
2180  * is using the session
2181  */
2182 static void sess_free_vps(UNUSED void *parent, void *data_ptr,
2183                                 UNUSED CRYPTO_EX_DATA *ad, UNUSED int idx,
2184                                 UNUSED long argl, UNUSED void *argp)
2185 {
2186         VALUE_PAIR *vp = data_ptr;
2187         if (!vp) return;
2188
2189         DEBUG2(LOG_PREFIX ": Freeing cached session VPs");
2190
2191         fr_pair_list_free(&vp);
2192 }
2193
2194 static void sess_free_certs(UNUSED void *parent, void *data_ptr,
2195                                 UNUSED CRYPTO_EX_DATA *ad, UNUSED int idx,
2196                                 UNUSED long argl, UNUSED void *argp)
2197 {
2198         VALUE_PAIR **certs = data_ptr;
2199         if (!certs) return;
2200
2201         DEBUG2(LOG_PREFIX ": Freeing cached session Certificates");
2202
2203         fr_pair_list_free(certs);
2204 }
2205
2206 /** Add all the default ciphers and message digests reate our context.
2207  *
2208  * This should be called exactly once from main, before reading the main config
2209  * or initialising any modules.
2210  */
2211 void tls_global_init(void)
2212 {
2213         SSL_load_error_strings();       /* readable error messages (examples show call before library_init) */
2214         SSL_library_init();             /* initialize library */
2215         OpenSSL_add_all_algorithms();   /* required for SHA2 in OpenSSL < 0.9.8o and 1.0.0.a */
2216         OPENSSL_config(NULL);
2217
2218         /*
2219          *      Initialize the index for the certificates.
2220          */
2221         fr_tls_ex_index_certs = SSL_SESSION_get_ex_new_index(0, NULL, NULL, NULL, sess_free_certs);
2222 }
2223
2224 #ifdef ENABLE_OPENSSL_VERSION_CHECK
2225 /** Check for vulnerable versions of libssl
2226  *
2227  * @param acknowledged The highest CVE number a user has confirmed is not present in the system's libssl.
2228  * @return 0 if the CVE specified by the user matches the most recent CVE we have, else -1.
2229  */
2230 int tls_global_version_check(char const *acknowledged)
2231 {
2232         uint64_t v;
2233
2234         if ((strcmp(acknowledged, libssl_defects[0].id) != 0) && (strcmp(acknowledged, "yes") != 0)) {
2235                 bool bad = false;
2236                 size_t i;
2237
2238                 /* Check for bad versions */
2239                 v = (uint64_t) SSLeay();
2240
2241                 for (i = 0; i < (sizeof(libssl_defects) / sizeof(*libssl_defects)); i++) {
2242                         libssl_defect_t *defect = &libssl_defects[i];
2243
2244                         if ((v >= defect->low) && (v <= defect->high)) {
2245                                 ERROR("Refusing to start with libssl version %s (in range %s)",
2246                                       ssl_version(), ssl_version_range(defect->low, defect->high));
2247                                 ERROR("Security advisory %s (%s)", defect->id, defect->name);
2248                                 ERROR("%s", defect->comment);
2249
2250                                 bad = true;
2251                         }
2252                 }
2253
2254                 if (bad) {
2255                         INFO("Once you have verified libssl has been correctly patched, "
2256                              "set security.allow_vulnerable_openssl = '%s'", libssl_defects[0].id);
2257                         return -1;
2258                 }
2259         }
2260
2261         return 0;
2262 }
2263 #endif
2264
2265 /** Free any memory alloced by libssl
2266  *
2267  */
2268 void tls_global_cleanup(void)
2269 {
2270         ERR_remove_state(0);
2271         ENGINE_cleanup();
2272         CONF_modules_unload(1);
2273         ERR_free_strings();
2274         EVP_cleanup();
2275         CRYPTO_cleanup_all_ex_data();
2276 }
2277
2278 /** Create SSL context
2279  *
2280  * - Load the trusted CAs
2281  * - Load the Private key & the certificate
2282  * - Set the Context options & Verify options
2283  */
2284 SSL_CTX *tls_init_ctx(fr_tls_server_conf_t *conf, int client)
2285 {
2286         SSL_CTX         *ctx;
2287         X509_STORE      *certstore;
2288         int             verify_mode = SSL_VERIFY_NONE;
2289         int             ctx_options = 0;
2290         int             ctx_tls_versions = 0;
2291         int             type;
2292
2293         /*
2294          *      SHA256 is in all versions of OpenSSL, but isn't
2295          *      initialized by default.  It's needed for WiMAX
2296          *      certificates.
2297          */
2298 #ifdef HAVE_OPENSSL_EVP_SHA256
2299         EVP_add_digest(EVP_sha256());
2300 #endif
2301
2302         ctx = SSL_CTX_new(SSLv23_method()); /* which is really "all known SSL / TLS methods".  Idiots. */
2303         if (!ctx) {
2304                 int err;
2305                 while ((err = ERR_get_error())) {
2306                         ERROR(LOG_PREFIX ": Failed creating SSL context: %s", ERR_error_string(err, NULL));
2307                         return NULL;
2308                 }
2309         }
2310
2311         /*
2312          * Save the config on the context so that callbacks which
2313          * only get SSL_CTX* e.g. session persistence, can get it
2314          */
2315         SSL_CTX_set_app_data(ctx, conf);
2316
2317         /*
2318          * Identify the type of certificates that needs to be loaded
2319          */
2320         if (conf->file_type) {
2321                 type = SSL_FILETYPE_PEM;
2322         } else {
2323                 type = SSL_FILETYPE_ASN1;
2324         }
2325
2326         /*
2327          * Set the password to load private key
2328          */
2329         if (conf->private_key_password) {
2330 #ifdef __APPLE__
2331                 /*
2332                  * We don't want to put the private key password in eap.conf, so  check
2333                  * for our special string which indicates we should get the password
2334                  * programmatically.
2335                  */
2336                 char const* special_string = "Apple:UseCertAdmin";
2337                 if (strncmp(conf->private_key_password, special_string, strlen(special_string)) == 0) {
2338                         char cmd[256];
2339                         char *password;
2340                         long const max_password_len = 128;
2341                         snprintf(cmd, sizeof(cmd) - 1, "/usr/sbin/certadmin --get-private-key-passphrase \"%s\"",
2342                                  conf->private_key_file);
2343
2344                         DEBUG2(LOG_PREFIX ":  Getting private key passphrase using command \"%s\"", cmd);
2345
2346                         FILE* cmd_pipe = popen(cmd, "r");
2347                         if (!cmd_pipe) {
2348                                 ERROR(LOG_PREFIX ": %s command failed: Unable to get private_key_password", cmd);
2349                                 ERROR(LOG_PREFIX ": Error reading private_key_file %s", conf->private_key_file);
2350                                 return NULL;
2351                         }
2352
2353                         rad_const_free(conf->private_key_password);
2354                         password = talloc_array(conf, char, max_password_len);
2355                         if (!password) {
2356                                 ERROR(LOG_PREFIX ": Can't allocate space for private_key_password");
2357                                 ERROR(LOG_PREFIX ": Error reading private_key_file %s", conf->private_key_file);
2358                                 pclose(cmd_pipe);
2359                                 return NULL;
2360                         }
2361
2362                         fgets(password, max_password_len, cmd_pipe);
2363                         pclose(cmd_pipe);
2364
2365                         /* Get rid of newline at end of password. */
2366                         password[strlen(password) - 1] = '\0';
2367
2368                         DEBUG3(LOG_PREFIX ": Password from command = \"%s\"", password);
2369                         conf->private_key_password = password;
2370                 }
2371 #endif
2372
2373                 {
2374                         char *password;
2375
2376                         memcpy(&password, &conf->private_key_password, sizeof(password));
2377                         SSL_CTX_set_default_passwd_cb_userdata(ctx, password);
2378                         SSL_CTX_set_default_passwd_cb(ctx, cbtls_password);
2379                 }
2380         }
2381
2382 #ifdef PSK_MAX_IDENTITY_LEN
2383         if (!client) {
2384                 /*
2385                  *      No dynamic query exists.  There MUST be a
2386                  *      statically configured identity and password.
2387                  */
2388                 if (conf->psk_query && !*conf->psk_query) {
2389                         ERROR(LOG_PREFIX ": Invalid PSK Configuration: psk_query cannot be empty");
2390                         return NULL;
2391                 }
2392
2393                 /*
2394                  *      Set the callback only if we can check things.
2395                  */
2396                 if (conf->psk_identity || conf->psk_query) {
2397                         SSL_CTX_set_psk_server_callback(ctx, psk_server_callback);
2398                 }
2399
2400         } else if (conf->psk_query) {
2401                 ERROR(LOG_PREFIX ": Invalid PSK Configuration: psk_query cannot be used for outgoing connections");
2402                 return NULL;
2403         }
2404
2405         /*
2406          *      Now check that if PSK is being used, the config is valid.
2407          */
2408         if ((conf->psk_identity && !conf->psk_password) ||
2409             (!conf->psk_identity && conf->psk_password) ||
2410             (conf->psk_identity && !*conf->psk_identity) ||
2411             (conf->psk_password && !*conf->psk_password)) {
2412                 ERROR(LOG_PREFIX ": Invalid PSK Configuration: psk_identity or psk_password are empty");
2413                 return NULL;
2414         }
2415
2416         if (conf->psk_identity) {
2417                 size_t psk_len, hex_len;
2418                 uint8_t buffer[PSK_MAX_PSK_LEN];
2419
2420                 if (conf->certificate_file ||
2421                     conf->private_key_password || conf->private_key_file ||
2422                     conf->ca_file || conf->ca_path) {
2423                         ERROR(LOG_PREFIX ": When PSKs are used, No certificate configuration is permitted");
2424                         return NULL;
2425                 }
2426
2427                 if (client) {
2428                         SSL_CTX_set_psk_client_callback(ctx,
2429                                                         psk_client_callback);
2430                 }
2431
2432                 psk_len = strlen(conf->psk_password);
2433                 if (strlen(conf->psk_password) > (2 * PSK_MAX_PSK_LEN)) {
2434                         ERROR(LOG_PREFIX ": psk_hexphrase is too long (max %d)", PSK_MAX_PSK_LEN);
2435                         return NULL;
2436                 }
2437
2438                 /*
2439                  *      Check the password now, so that we don't have
2440                  *      errors at run-time.
2441                  */
2442                 hex_len = fr_hex2bin(buffer, sizeof(buffer), conf->psk_password, psk_len);
2443                 if (psk_len != (2 * hex_len)) {
2444                         ERROR(LOG_PREFIX ": psk_hexphrase is not all hex");
2445                         return NULL;
2446                 }
2447
2448                 goto post_ca;
2449         }
2450 #else
2451         (void) client;  /* -Wunused */
2452 #endif
2453
2454         /*
2455          *      Load our keys and certificates
2456          *
2457          *      If certificates are of type PEM then we can make use
2458          *      of cert chain authentication using openssl api call
2459          *      SSL_CTX_use_certificate_chain_file.  Please see how
2460          *      the cert chain needs to be given in PEM from
2461          *      openSSL.org
2462          */
2463         if (!conf->certificate_file) goto load_ca;
2464
2465         if (type == SSL_FILETYPE_PEM) {
2466                 if (!(SSL_CTX_use_certificate_chain_file(ctx, conf->certificate_file))) {
2467                         ERROR(LOG_PREFIX ": Error reading certificate file %s:%s", conf->certificate_file,
2468                               ERR_error_string(ERR_get_error(), NULL));
2469                         return NULL;
2470                 }
2471
2472         } else if (!(SSL_CTX_use_certificate_file(ctx, conf->certificate_file, type))) {
2473                 ERROR(LOG_PREFIX ": Error reading certificate file %s:%s",
2474                       conf->certificate_file,
2475                       ERR_error_string(ERR_get_error(), NULL));
2476                 return NULL;
2477         }
2478
2479         /* Load the CAs we trust */
2480 load_ca:
2481         if (conf->ca_file || conf->ca_path) {
2482                 if (!SSL_CTX_load_verify_locations(ctx, conf->ca_file, conf->ca_path)) {
2483                         ERROR(LOG_PREFIX ": SSL error %s", ERR_error_string(ERR_get_error(), NULL));
2484                         ERROR(LOG_PREFIX ": Error reading Trusted root CA list %s",conf->ca_file );
2485                         return NULL;
2486                 }
2487         }
2488         if (conf->ca_file && *conf->ca_file) SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(conf->ca_file));
2489
2490         if (conf->private_key_file) {
2491                 if (!(SSL_CTX_use_PrivateKey_file(ctx, conf->private_key_file, type))) {
2492                         ERROR(LOG_PREFIX ": Failed reading private key file %s:%s",
2493                               conf->private_key_file,
2494                               ERR_error_string(ERR_get_error(), NULL));
2495                         return NULL;
2496                 }
2497
2498                 /*
2499                  * Check if the loaded private key is the right one
2500                  */
2501                 if (!SSL_CTX_check_private_key(ctx)) {
2502                         ERROR(LOG_PREFIX ": Private key does not match the certificate public key");
2503                         return NULL;
2504                 }
2505         }
2506
2507 #ifdef PSK_MAX_IDENTITY_LEN
2508 post_ca:
2509 #endif
2510
2511         /*
2512          *      We never want SSLv2 or SSLv3.
2513          */
2514         ctx_options |= SSL_OP_NO_SSLv2;
2515         ctx_options |= SSL_OP_NO_SSLv3;
2516
2517         /*
2518          *      As of 3.0.5, we always allow TLSv1.1 and TLSv1.2.
2519          *      Though they can be *globally* disabled if necessary.x
2520          */
2521 #ifdef SSL_OP_NO_TLSv1
2522         if (conf->disable_tlsv1) ctx_options |= SSL_OP_NO_TLSv1;
2523
2524         ctx_tls_versions |= SSL_OP_NO_TLSv1;
2525 #endif
2526 #ifdef SSL_OP_NO_TLSv1_1
2527         if (conf->disable_tlsv1_1) ctx_options |= SSL_OP_NO_TLSv1_1;
2528
2529         ctx_tls_versions |= SSL_OP_NO_TLSv1_1;
2530 #endif
2531 #ifdef SSL_OP_NO_TLSv1_2
2532         if (conf->disable_tlsv1_2) ctx_options |= SSL_OP_NO_TLSv1_2;
2533
2534         ctx_tls_versions |= SSL_OP_NO_TLSv1_2;
2535 #endif
2536
2537         if ((ctx_options & ctx_tls_versions) == ctx_tls_versions) {
2538                 ERROR(LOG_PREFIX ": You have disabled all available TLS versions.  EAP will not work");
2539                 return NULL;
2540         }
2541
2542 #ifdef SSL_OP_NO_TICKET
2543         ctx_options |= SSL_OP_NO_TICKET;
2544 #endif
2545
2546         /*
2547          *      SSL_OP_SINGLE_DH_USE must be used in order to prevent
2548          *      small subgroup attacks and forward secrecy. Always
2549          *      using
2550          *
2551          *      SSL_OP_SINGLE_DH_USE has an impact on the computer
2552          *      time needed during negotiation, but it is not very
2553          *      large.
2554          */
2555         ctx_options |= SSL_OP_SINGLE_DH_USE;
2556
2557         /*
2558          *      SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS to work around issues
2559          *      in Windows Vista client.
2560          *      http://www.openssl.org/~bodo/tls-cbc.txt
2561          *      http://www.nabble.com/(RADIATOR)-Radiator-Version-3.16-released-t2600070.html
2562          */
2563         ctx_options |= SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
2564
2565         SSL_CTX_set_options(ctx, ctx_options);
2566
2567         /*
2568          *      TODO: Set the RSA & DH
2569          *      SSL_CTX_set_tmp_rsa_callback(ctx, cbtls_rsa);
2570          *      SSL_CTX_set_tmp_dh_callback(ctx, cbtls_dh);
2571          */
2572
2573         /*
2574          *      set the message callback to identify the type of
2575          *      message.  For every new session, there can be a
2576          *      different callback argument.
2577          *
2578          *      SSL_CTX_set_msg_callback(ctx, cbtls_msg);
2579          */
2580
2581         /*
2582          *      Set eliptical curve crypto configuration.
2583          */
2584 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
2585 #ifndef OPENSSL_NO_ECDH
2586         if (set_ecdh_curve(ctx, conf->ecdh_curve) < 0) {
2587                 return NULL;
2588         }
2589 #endif
2590 #endif
2591
2592         /* Set Info callback */
2593         SSL_CTX_set_info_callback(ctx, cbtls_info);
2594
2595         /*
2596          *      Callbacks, etc. for session resumption.
2597          */
2598         if (conf->session_cache_enable) {
2599                 /*
2600                  *      Cache sessions on disk if requested.
2601                  */
2602                 if (conf->session_cache_path) {
2603                         SSL_CTX_sess_set_new_cb(ctx, cbtls_new_session);
2604                         SSL_CTX_sess_set_get_cb(ctx, cbtls_get_session);
2605                         SSL_CTX_sess_set_remove_cb(ctx, cbtls_remove_session);
2606                 }
2607
2608                 SSL_CTX_set_quiet_shutdown(ctx, 1);
2609                 if (fr_tls_ex_index_vps < 0)
2610                         fr_tls_ex_index_vps = SSL_SESSION_get_ex_new_index(0, NULL, NULL, NULL, sess_free_vps);
2611         }
2612
2613         /*
2614          *      Check the certificates for revocation.
2615          */
2616 #ifdef X509_V_FLAG_CRL_CHECK
2617         if (conf->check_crl) {
2618                 certstore = SSL_CTX_get_cert_store(ctx);
2619                 if (certstore == NULL) {
2620                         ERROR(LOG_PREFIX ": SSL error %s", ERR_error_string(ERR_get_error(), NULL));
2621                         ERROR(LOG_PREFIX ": Error reading Certificate Store");
2622                         return NULL;
2623                 }
2624                 X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK);
2625
2626 #ifdef X509_V_FLAG_CRL_CHECK_ALL
2627                 if (conf->check_all_crl)
2628                         X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK_ALL);
2629 #endif
2630         }
2631 #endif
2632
2633         /*
2634          *      Set verify modes
2635          *      Always verify the peer certificate
2636          */
2637         verify_mode |= SSL_VERIFY_PEER;
2638         verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
2639         verify_mode |= SSL_VERIFY_CLIENT_ONCE;
2640         SSL_CTX_set_verify(ctx, verify_mode, cbtls_verify);
2641
2642         if (conf->verify_depth) {
2643                 SSL_CTX_set_verify_depth(ctx, conf->verify_depth);
2644         }
2645
2646         /* Load randomness */
2647         if (conf->random_file) {
2648                 if (!(RAND_load_file(conf->random_file, 1024*10))) {
2649                         ERROR(LOG_PREFIX ": SSL error %s", ERR_error_string(ERR_get_error(), NULL));
2650                         ERROR(LOG_PREFIX ": Error loading randomness");
2651                         return NULL;
2652                 }
2653         }
2654
2655         /*
2656          * Set the cipher list if we were told to
2657          */
2658         if (conf->cipher_list) {
2659                 if (!SSL_CTX_set_cipher_list(ctx, conf->cipher_list)) {
2660                         ERROR(LOG_PREFIX ": Error setting cipher list");
2661                         return NULL;
2662                 }
2663         }
2664
2665         /*
2666          *      Setup session caching
2667          */
2668         if (conf->session_cache_enable) {
2669                 /*
2670                  *      Create a unique context Id per EAP-TLS configuration.
2671                  */
2672                 if (conf->session_id_name) {
2673                         snprintf(conf->session_context_id, sizeof(conf->session_context_id),
2674                                  "FR eap %s", conf->session_id_name);
2675                 } else {
2676                         snprintf(conf->session_context_id, sizeof(conf->session_context_id),
2677                                  "FR eap %p", conf);
2678                 }
2679
2680                 /*
2681                  *      Cache it, and DON'T auto-clear it.
2682                  */
2683                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_SERVER | SSL_SESS_CACHE_NO_AUTO_CLEAR);
2684
2685                 SSL_CTX_set_session_id_context(ctx,
2686                                                (unsigned char *) conf->session_context_id,
2687                                                (unsigned int) strlen(conf->session_context_id));
2688
2689                 /*
2690                  *      Our timeout is in hours, this is in seconds.
2691                  */
2692                 SSL_CTX_set_timeout(ctx, conf->session_timeout * 3600);
2693
2694                 /*
2695                  *      Set the maximum number of entries in the
2696                  *      session cache.
2697                  */
2698                 SSL_CTX_sess_set_cache_size(ctx, conf->session_cache_size);
2699
2700         } else {
2701                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
2702         }
2703
2704         return ctx;
2705 }
2706
2707
2708 /*
2709  *      Free TLS client/server config
2710  *      Should not be called outside this code, as a callback is
2711  *      added to automatically free the data when the CONF_SECTION
2712  *      is freed.
2713  */
2714 static int _tls_server_conf_free(fr_tls_server_conf_t *conf)
2715 {
2716         if (conf->ctx) SSL_CTX_free(conf->ctx);
2717
2718 #ifdef HAVE_OPENSSL_OCSP_H
2719         if (conf->ocsp_store) X509_STORE_free(conf->ocsp_store);
2720         conf->ocsp_store = NULL;
2721 #endif
2722
2723 #ifndef NDEBUG
2724         memset(conf, 0, sizeof(*conf));
2725 #endif
2726         return 0;
2727 }
2728
2729 static fr_tls_server_conf_t *tls_server_conf_alloc(TALLOC_CTX *ctx)
2730 {
2731         fr_tls_server_conf_t *conf;
2732
2733         conf = talloc_zero(ctx, fr_tls_server_conf_t);
2734         if (!conf) {
2735                 ERROR(LOG_PREFIX ": Out of memory");
2736                 return NULL;
2737         }
2738
2739         talloc_set_destructor(conf, _tls_server_conf_free);
2740
2741         return conf;
2742 }
2743
2744 fr_tls_server_conf_t *tls_server_conf_parse(CONF_SECTION *cs)
2745 {
2746         fr_tls_server_conf_t *conf;
2747
2748         /*
2749          *      If cs has already been parsed there should be a cached copy
2750          *      of conf already stored, so just return that.
2751          */
2752         conf = cf_data_find(cs, "tls-conf");
2753         if (conf) {
2754                 DEBUG(LOG_PREFIX ": Using cached TLS configuration from previous invocation");
2755                 return conf;
2756         }
2757
2758         conf = tls_server_conf_alloc(cs);
2759
2760         if (cf_section_parse(cs, conf, tls_server_config) < 0) {
2761         error:
2762                 talloc_free(conf);
2763                 return NULL;
2764         }
2765
2766         /*
2767          *      Save people from their own stupidity.
2768          */
2769         if (conf->fragment_size < 100) conf->fragment_size = 100;
2770
2771         if (!conf->private_key_file) {
2772                 ERROR(LOG_PREFIX ": TLS Server requires a private key file");
2773                 goto error;
2774         }
2775
2776         if (!conf->certificate_file) {
2777                 ERROR(LOG_PREFIX ": TLS Server requires a certificate file");
2778                 goto error;
2779         }
2780
2781         /*
2782          *      Initialize TLS
2783          */
2784         conf->ctx = tls_init_ctx(conf, 0);
2785         if (conf->ctx == NULL) {
2786                 goto error;
2787         }
2788
2789 #ifdef HAVE_OPENSSL_OCSP_H
2790         /*
2791          *      Initialize OCSP Revocation Store
2792          */
2793         if (conf->ocsp_enable) {
2794                 conf->ocsp_store = init_revocation_store(conf);
2795                 if (conf->ocsp_store == NULL) goto error;
2796         }
2797 #endif /*HAVE_OPENSSL_OCSP_H*/
2798         {
2799                 char *dh_file;
2800
2801                 memcpy(&dh_file, &conf->dh_file, sizeof(dh_file));
2802                 if (load_dh_params(conf->ctx, dh_file) < 0) {
2803                         goto error;
2804                 }
2805         }
2806
2807         if (conf->verify_tmp_dir) {
2808                 if (chmod(conf->verify_tmp_dir, S_IRWXU) < 0) {
2809                         ERROR(LOG_PREFIX ": Failed changing permissions on %s: %s",
2810                               conf->verify_tmp_dir, fr_syserror(errno));
2811                         goto error;
2812                 }
2813         }
2814
2815         if (conf->verify_client_cert_cmd && !conf->verify_tmp_dir) {
2816                 ERROR(LOG_PREFIX ": You MUST set the verify directory in order to use verify_client_cmd");
2817                 goto error;
2818         }
2819
2820         /*
2821          *      Cache conf in cs in case we're asked to parse this again.
2822          */
2823         cf_data_add(cs, "tls-conf", conf, NULL);
2824
2825         return conf;
2826 }
2827
2828 fr_tls_server_conf_t *tls_client_conf_parse(CONF_SECTION *cs)
2829 {
2830         fr_tls_server_conf_t *conf;
2831
2832         conf = cf_data_find(cs, "tls-conf");
2833         if (conf) {
2834                 DEBUG2(LOG_PREFIX ": Using cached TLS configuration from previous invocation");
2835                 return conf;
2836         }
2837
2838         conf = tls_server_conf_alloc(cs);
2839
2840         if (cf_section_parse(cs, conf, tls_client_config) < 0) {
2841         error:
2842                 talloc_free(conf);
2843                 return NULL;
2844         }
2845
2846         /*
2847          *      Save people from their own stupidity.
2848          */
2849         if (conf->fragment_size < 100) conf->fragment_size = 100;
2850
2851         /*
2852          *      Initialize TLS
2853          */
2854         conf->ctx = tls_init_ctx(conf, 1);
2855         if (conf->ctx == NULL) {
2856                 goto error;
2857         }
2858
2859         {
2860                 char *dh_file;
2861
2862                 memcpy(&dh_file, &conf->dh_file, sizeof(dh_file));
2863                 if (load_dh_params(conf->ctx, dh_file) < 0) {
2864                         goto error;
2865                 }
2866         }
2867
2868         cf_data_add(cs, "tls-conf", conf, NULL);
2869
2870         return conf;
2871 }
2872
2873 int tls_success(tls_session_t *ssn, REQUEST *request)
2874 {
2875         VALUE_PAIR *vp, *vps = NULL;
2876         fr_tls_server_conf_t *conf;
2877         TALLOC_CTX *talloc_ctx;
2878
2879         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CONF);
2880         rad_assert(conf != NULL);
2881
2882         talloc_ctx = SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_TALLOC);
2883
2884         /*
2885          *      If there's no session resumption, delete the entry
2886          *      from the cache.  This means either it's disabled
2887          *      globally for this SSL context, OR we were told to
2888          *      disable it for this user.
2889          *
2890          *      This also means you can't turn it on just for one
2891          *      user.
2892          */
2893         if ((!ssn->allow_session_resumption) ||
2894             (((vp = fr_pair_find_by_num(request->config, PW_ALLOW_SESSION_RESUMPTION, 0, TAG_ANY)) != NULL) &&
2895              (vp->vp_integer == 0))) {
2896                 SSL_CTX_remove_session(ssn->ctx,
2897                                        ssn->ssl->session);
2898                 ssn->allow_session_resumption = false;
2899
2900                 /*
2901                  *      If we're in a resumed session and it's
2902                  *      not allowed,
2903                  */
2904                 if (SSL_session_reused(ssn->ssl)) {
2905                         RDEBUG("Forcibly stopping session resumption as it is not allowed");
2906                         return -1;
2907                 }
2908
2909         /*
2910          *      Else resumption IS allowed, so we store the
2911          *      user data in the cache.
2912          */
2913         } else if (!SSL_session_reused(ssn->ssl)) {
2914                 size_t size;
2915                 VALUE_PAIR **certs;
2916                 char buffer[2 * MAX_SESSION_SIZE + 1];
2917
2918                 size = ssn->ssl->session->session_id_length;
2919                 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
2920
2921                 fr_bin2hex(buffer, ssn->ssl->session->session_id, size);
2922
2923                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->reply->vps, PW_USER_NAME, 0, TAG_ANY);
2924                 if (vp) fr_pair_add(&vps, vp);
2925
2926                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->packet->vps, PW_STRIPPED_USER_NAME, 0, TAG_ANY);
2927                 if (vp) fr_pair_add(&vps, vp);
2928
2929                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->packet->vps, PW_STRIPPED_USER_DOMAIN, 0, TAG_ANY);
2930                 if (vp) fr_pair_add(&vps, vp);
2931
2932                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->reply->vps, PW_CHARGEABLE_USER_IDENTITY, 0, TAG_ANY);
2933                 if (vp) fr_pair_add(&vps, vp);
2934
2935                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->reply->vps, PW_CACHED_SESSION_POLICY, 0, TAG_ANY);
2936                 if (vp) fr_pair_add(&vps, vp);
2937
2938                 certs = (VALUE_PAIR **)SSL_get_ex_data(ssn->ssl, fr_tls_ex_index_certs);
2939
2940                 /*
2941                  *      Hmm... the certs should probably be session data.
2942                  */
2943                 if (certs) {
2944                         /*
2945                          *      @todo: some go into reply, others into
2946                          *      request
2947                          */
2948                         fr_pair_add(&vps, fr_pair_list_copy(talloc_ctx, *certs));
2949
2950                         /*
2951                          *      Save the certs in the packet, so that we can see them.
2952                          */
2953                         fr_pair_add(&request->packet->vps, fr_pair_list_copy(request->packet, *certs));
2954                 }
2955
2956                 if (vps) {
2957                         SSL_SESSION_set_ex_data(ssn->ssl->session, fr_tls_ex_index_vps, vps);
2958                         rdebug_pair_list(L_DBG_LVL_2, request, vps, "  caching ");
2959
2960                         if (conf->session_cache_path) {
2961                                 /* write the VPs to the cache file */
2962                                 char filename[256], buf[1024];
2963                                 FILE *vp_file;
2964
2965                                 RDEBUG2("Saving session %s in the disk cache", buffer);
2966
2967                                 snprintf(filename, sizeof(filename), "%s%c%s.vps", conf->session_cache_path,
2968                                          FR_DIR_SEP, buffer);
2969                                 vp_file = fopen(filename, "w");
2970                                 if (vp_file == NULL) {
2971                                         RWDEBUG("Could not write session VPs to persistent cache: %s",
2972                                                 fr_syserror(errno));
2973                                 } else {
2974                                         VALUE_PAIR *prev = NULL;
2975                                         vp_cursor_t cursor;
2976                                         /* generate a dummy user-style entry which is easy to read back */
2977                                         fprintf(vp_file, "# SSL cached session\n");
2978                                         fprintf(vp_file, "%s\n\t", buffer);
2979
2980                                         for (vp = fr_cursor_init(&cursor, &vps);
2981                                              vp;
2982                                              vp = fr_cursor_next(&cursor)) {
2983                                                 /*
2984                                                  *      Terminate the previous line.
2985                                                  */
2986                                                 if (prev) fprintf(vp_file, ",\n\t");
2987
2988                                                 /*
2989                                                  *      Write this one.
2990                                                  */
2991                                                 vp_prints(buf, sizeof(buf), vp);
2992                                                 fputs(buf, vp_file);
2993                                                 prev = vp;
2994                                         }
2995
2996                                         /*
2997                                          *      Terminate the final line.
2998                                          */
2999                                         fprintf(vp_file, "\n");
3000                                         fclose(vp_file);
3001                                 }
3002                         } else {
3003                                 RDEBUG("Failed to find 'persist_dir' in TLS configuration.  Session will not be cached on disk.");
3004                         }
3005                 } else {
3006                         RDEBUG2("No information to cache: session caching will be disabled for session %s", buffer);
3007                         SSL_CTX_remove_session(ssn->ctx, ssn->ssl->session);
3008                 }
3009
3010         /*
3011          *      Else the session WAS allowed.  Copy the cached reply.
3012          */
3013         } else {
3014                 size_t size;
3015                 char buffer[2 * MAX_SESSION_SIZE + 1];
3016
3017                 size = ssn->ssl->session->session_id_length;
3018                 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
3019
3020                 fr_bin2hex(buffer, ssn->ssl->session->session_id, size);
3021
3022                 /*
3023                  *      The "restore VPs from OpenSSL cache" code is
3024                  *      now in eaptls_process()
3025                  */
3026
3027                 if (conf->session_cache_path) {
3028                         /* "touch" the cached session/vp file */
3029                         char filename[256];
3030
3031                         snprintf(filename, sizeof(filename), "%s%c%s.asn1",
3032                                  conf->session_cache_path, FR_DIR_SEP, buffer);
3033                         utime(filename, NULL);
3034                         snprintf(filename, sizeof(filename), "%s%c%s.vps",
3035                                  conf->session_cache_path, FR_DIR_SEP, buffer);
3036                         utime(filename, NULL);
3037                 }
3038
3039                 /*
3040                  *      Mark the request as resumed.
3041                  */
3042                 pair_make_request("EAP-Session-Resumed", "1", T_OP_SET);
3043         }
3044
3045         return 0;
3046 }
3047
3048
3049 void tls_fail(tls_session_t *ssn)
3050 {
3051         /*
3052          *      Force the session to NOT be cached.
3053          */
3054         SSL_CTX_remove_session(ssn->ctx, ssn->ssl->session);
3055 }
3056
3057 fr_tls_status_t tls_application_data(tls_session_t *ssn, REQUEST *request)
3058
3059 {
3060         int err;
3061         VALUE_PAIR **certs;
3062
3063         /*
3064          *      Decrypt the complete record.
3065          */
3066         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data,
3067                         ssn->dirty_in.used);
3068         if (err != (int) ssn->dirty_in.used) {
3069                 record_init(&ssn->dirty_in);
3070                 RDEBUG("Failed writing %zd bytes to SSL BIO: %d", ssn->dirty_in.used, err);
3071                 return FR_TLS_FAIL;
3072         }
3073
3074         /*
3075          *      Clear the dirty buffer now that we are done with it
3076          *      and init the clean_out buffer to store decrypted data
3077          */
3078         record_init(&ssn->dirty_in);
3079         record_init(&ssn->clean_out);
3080
3081         /*
3082          *      Read (and decrypt) the tunneled data from the
3083          *      SSL session, and put it into the decrypted
3084          *      data buffer.
3085          */
3086         err = SSL_read(ssn->ssl, ssn->clean_out.data, sizeof(ssn->clean_out.data));
3087         if (err < 0) {
3088                 int code;
3089
3090                 RDEBUG("SSL_read Error");
3091
3092                 code = SSL_get_error(ssn->ssl, err);
3093                 switch (code) {
3094                 case SSL_ERROR_WANT_READ:
3095                         DEBUG("Error in fragmentation logic: SSL_WANT_READ");
3096                         return FR_TLS_MORE_FRAGMENTS;
3097
3098                 case SSL_ERROR_WANT_WRITE:
3099                         DEBUG("Error in fragmentation logic: SSL_WANT_WRITE");
3100                         break;
3101
3102                 default:
3103                         DEBUG("Error in fragmentation logic: %s", ERR_error_string(code, NULL));
3104
3105                         /*
3106                          *      FIXME: Call int_ssl_check?
3107                          */
3108                         break;
3109                 }
3110                 return FR_TLS_FAIL;
3111         }
3112
3113         if (err == 0) RWDEBUG("No data inside of the tunnel");
3114
3115         /*
3116          *      Passed all checks, successfully decrypted data
3117          */
3118         ssn->clean_out.used = err;
3119
3120         /*
3121          *      Add the certificates to intermediate packets, so that
3122          *      the inner tunnel policies can use them.
3123          */
3124         certs = (VALUE_PAIR **)SSL_get_ex_data(ssn->ssl, fr_tls_ex_index_certs);
3125
3126         if (certs) fr_pair_add(&request->packet->vps, fr_pair_list_copy(request->packet, *certs));
3127
3128         return FR_TLS_OK;
3129 }
3130
3131
3132 /*
3133  * Acknowledge received is for one of the following messages sent earlier
3134  * 1. Handshake completed Message, so now send, EAP-Success
3135  * 2. Alert Message, now send, EAP-Failure
3136  * 3. Fragment Message, now send, next Fragment
3137  */
3138 fr_tls_status_t tls_ack_handler(tls_session_t *ssn, REQUEST *request)
3139 {
3140         if (ssn == NULL){
3141                 REDEBUG("Unexpected ACK received:  No ongoing SSL session");
3142                 return FR_TLS_INVALID;
3143         }
3144         if (!ssn->info.initialized) {
3145                 RDEBUG("No SSL info available.  Waiting for more SSL data");
3146                 return FR_TLS_REQUEST;
3147         }
3148
3149         if ((ssn->info.content_type == handshake) && (ssn->info.origin == 0)) {
3150                 REDEBUG("Unexpected ACK received:  We sent no previous messages");
3151                 return FR_TLS_INVALID;
3152         }
3153
3154         switch (ssn->info.content_type) {
3155         case alert:
3156                 RDEBUG2("Peer ACKed our alert");
3157                 return FR_TLS_FAIL;
3158
3159         case handshake:
3160                 if ((ssn->info.handshake_type == handshake_finished) && (ssn->dirty_out.used == 0)) {
3161                         RDEBUG2("Peer ACKed our handshake fragment.  handshake is finished");
3162
3163                         /*
3164                          *      From now on all the content is
3165                          *      application data set it here as nobody else
3166                          *      sets it.
3167                          */
3168                         ssn->info.content_type = application_data;
3169                         return FR_TLS_SUCCESS;
3170                 } /* else more data to send */
3171
3172                 RDEBUG2("Peer ACKed our handshake fragment");
3173                 /* Fragmentation handler, send next fragment */
3174                 return FR_TLS_REQUEST;
3175
3176         case application_data:
3177                 RDEBUG2("Peer ACKed our application data fragment");
3178                 return FR_TLS_REQUEST;
3179
3180                 /*
3181                  *      For the rest of the conditions, switch over
3182                  *      to the default section below.
3183                  */
3184         default:
3185                 REDEBUG("Invalid ACK received: %d", ssn->info.content_type);
3186                 return FR_TLS_INVALID;
3187         }
3188 }
3189 #endif  /* WITH_TLS */
3190