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, new versions of OpenSSL to older versions of OpenSSL.  */
  72 static libssl_defect_t libssl_defects[] =
  73 {
  74         {
  75                 .low            = 0x01010101f,          /* 1.1.0a */
  76                 .high           = 0x01010101f,          /* 1.1.0a */
  77                 .id             = "CVE-2016-6309",
  78                 .name           = "OCSP status request extension",
  79                 .comment        = "For more information see https://www.openssl.org/news/secadv/20160926.txt"
  80         },
  81         {
  82                 .low            = 0x01010100f,          /* 1.1.0  */
  83                 .high           = 0x01010100f,          /* 1.1.0  */
  84                 .id             = "CVE-2016-6304",
  85                 .name           = "OCSP status request extension",
  86                 .comment        = "For more information see https://www.openssl.org/news/secadv/20160922.txt"
  87         },
  88         {
  89                 .low            = 0x01000209f,          /* 1.0.2i */
  90                 .high           = 0x01000209f,          /* 1.0.2i */
  91                 .id             = "CVE-2016-7052",
  92                 .name           = "OCSP status request extension",
  93                 .comment        = "For more information see https://www.openssl.org/news/secadv/20160926.txt"
  94         },
  95         {
  96                 .low            = 0x01000200f,          /* 1.0.2  */
  97                 .high           = 0x01000208f,          /* 1.0.2h */
  98                 .id             = "CVE-2016-6304",
  99                 .name           = "OCSP status request extension",
 100                 .comment        = "For more information see https://www.openssl.org/news/secadv/20160922.txt"
 101         },
 102         {
 103                 .low            = 0x01000100f,          /* 1.0.1  */
 104                 .high           = 0x01000114f,          /* 1.0.1t */
 105                 .id             = "CVE-2016-6304",
 106                 .name           = "OCSP status request extension",
 107                 .comment        = "For more information see https://www.openssl.org/news/secadv/20160922.txt"
 108         },
 109         {
 110                 .low            = 0x010001000,          /* 1.0.1  */
 111                 .high           = 0x01000106f,          /* 1.0.1f */
 112                 .id             = "CVE-2014-0160",
 113                 .name           = "Heartbleed",
 114                 .comment        = "For more information see http://heartbleed.com"
 115         },
 116 };
 117 #endif /* ENABLE_OPENSSL_VERSION_CHECK */
 118
 119 FR_NAME_NUMBER const fr_tls_status_table[] = {
 120         { "invalid",                    FR_TLS_INVALID },
 121         { "request",                    FR_TLS_REQUEST },
 122         { "response",                   FR_TLS_RESPONSE },
 123         { "success",                    FR_TLS_SUCCESS },
 124         { "fail",                       FR_TLS_FAIL },
 125         { "noop",                       FR_TLS_NOOP },
 126
 127         { "start",                      FR_TLS_START },
 128         { "ok",                         FR_TLS_OK },
 129         { "ack",                        FR_TLS_ACK },
 130         { "first fragment",             FR_TLS_FIRST_FRAGMENT },
 131         { "more fragments",             FR_TLS_MORE_FRAGMENTS },
 132         { "length included",            FR_TLS_LENGTH_INCLUDED },
 133         { "more fragments with length", FR_TLS_MORE_FRAGMENTS_WITH_LENGTH },
 134         { "handled",                    FR_TLS_HANDLED },
 135         {  NULL ,                       -1},
 136 };
 137
 138 /* index we use to store cached session VPs
 139  * needs to be dynamic so we can supply a "free" function
 140  */
 141 int fr_tls_ex_index_vps = -1;
 142 int fr_tls_ex_index_certs = -1;
 143
 144 /* Session */
 145 static void             session_close(tls_session_t *ssn);
 146 static void             session_init(tls_session_t *ssn);
 147
 148 /* record */
 149 static void             record_init(record_t *buf);
 150 static void             record_close(record_t *buf);
 151 static unsigned int     record_plus(record_t *buf, void const *ptr,
 152                                     unsigned int size);
 153 static unsigned int     record_minus(record_t *buf, void *ptr,
 154                                      unsigned int size);
 155
 156 DIAG_OFF(format-nonliteral)
 157 /** Print errors in the TLS thread local error stack
 158  *
 159  * Drains the thread local OpenSSL error queue, and prints out errors.
 160  *
 161  * @param[in] request   The current request (may be NULL).
 162  * @param[in] msg       Error message describing the operation being attempted.
 163  * @param[in] ap        Arguments for msg.
 164  * @return the number of errors drained from the stack.
 165  */
 166 static int tls_verror_log(REQUEST *request, char const *msg, va_list ap)
 167 {
 168         unsigned long   error;
 169         char            *p;
 170         int             in_stack = 0;
 171         char            buffer[256];
 172
 173         int             line;
 174         char const      *file;
 175
 176         /*
 177          *      Pop the first error, so ERR_peek_error()
 178          *      can be used to determine if there are
 179          *      multiple errors.
 180          */
 181         error = ERR_get_error_line(&file, &line);
 182
 183         if (msg) {
 184                 p = talloc_vasprintf(request, msg, ap);
 185
 186                 /*
 187                  *      Single line mode (there's only one error)
 188                  */
 189                 if (error && !ERR_peek_error()) {
 190                         ERR_error_string_n(error, buffer, sizeof(buffer));
 191
 192                         /* Extra verbose */
 193                         if ((request && RDEBUG_ENABLED3) || DEBUG_ENABLED3) {
 194                                 ROPTIONAL(REDEBUG, ERROR, "%s: %s[%i]:%s", p, file, line, buffer);
 195                         } else {
 196                                 ROPTIONAL(REDEBUG, ERROR, "%s: %s", p, buffer);
 197                         }
 198
 199                         talloc_free(p);
 200
 201                         return 1;
 202                 }
 203
 204                 /*
 205                  *      Print the error we were given, irrespective
 206                  *      of whether there were any OpenSSL errors.
 207                  */
 208                 ROPTIONAL(RERROR, ERROR, "%s", p);
 209                 talloc_free(p);
 210         }
 211
 212         /*
 213          *      Stack mode (there are multiple errors)
 214          */
 215         if (!error) return 0;
 216         do {
 217                 ERR_error_string_n(error, buffer, sizeof(buffer));
 218                 /* Extra verbose */
 219                 if ((request && RDEBUG_ENABLED3) || DEBUG_ENABLED3) {
 220                         ROPTIONAL(REDEBUG, ERROR, "%s[%i]:%s", file, line, buffer);
 221                 } else {
 222                         ROPTIONAL(REDEBUG, ERROR, "%s", buffer);
 223                 }
 224                 in_stack++;
 225         } while ((error = ERR_get_error_line(&file, &line)));
 226
 227         return in_stack;
 228 }
 229 DIAG_ON(format-nonliteral)
 230
 231 /** Print errors in the TLS thread local error stack
 232  *
 233  * Drains the thread local OpenSSL error queue, and prints out errors.
 234  *
 235  * @param[in] request   The current request (may be NULL).
 236  * @param[in] msg       Error message describing the operation being attempted.
 237  * @param[in] ...       Arguments for msg.
 238  * @return the number of errors drained from the stack.
 239  */
 240 int tls_error_log(REQUEST *request, char const *msg, ...)
 241 {
 242         va_list ap;
 243         int ret;
 244
 245         va_start(ap, msg);
 246         ret = tls_verror_log(request, msg, ap);
 247         va_end(ap);
 248
 249         return ret;
 250 }
 251
 252 /** Print errors raised by OpenSSL I/O functions
 253  *
 254  * Drains the thread local OpenSSL error queue, and prints out errors
 255  * based on the SSL handle and the return code of the I/O  function.
 256  *
 257  * OpenSSL lists I/O functions to be:
 258  *   - SSL_connect
 259  *   - SSL_accept
 260  *   - SSL_do_handshake
 261  *   - SSL_read
 262  *   - SSL_peek
 263  *   - SSL_write
 264  *
 265  * @param request       The current request (may be NULL).
 266  * @param session       The current tls_session.
 267  * @param ret           from the I/O operation.
 268  * @param msg           Error message describing the operation being attempted.
 269  * @param ...           Arguments for msg.
 270  * @return
 271  *      - 0 TLS session cannot continue.
 272  *      - 1 TLS session may still be viable.
 273  */
 274 int tls_error_io_log(REQUEST *request, tls_session_t *session, int ret, char const *msg, ...)
 275 {
 276         int     error;
 277         va_list ap;
 278
 279         if (ERR_peek_error()) {
 280                 va_start(ap, msg);
 281                 tls_verror_log(request, msg, ap);
 282                 va_end(ap);
 283         }
 284
 285         error = SSL_get_error(session->ssl, ret);
 286         switch (error) {
 287         /*
 288          *      These seem to be harmless and already "dealt
 289          *      with" by our non-blocking environment. NB:
 290          *      "ZERO_RETURN" is the clean "error"
 291          *      indicating a successfully closed SSL
 292          *      tunnel. We let this happen because our IO
 293          *      loop should not appear to have broken on
 294          *      this condition - and outside the IO loop, the
 295          *      "shutdown" state is checked.
 296          *
 297          *      Don't print anything if we ignore the error.
 298          */
 299         case SSL_ERROR_NONE:
 300         case SSL_ERROR_WANT_READ:
 301         case SSL_ERROR_WANT_WRITE:
 302         case SSL_ERROR_WANT_X509_LOOKUP:
 303         case SSL_ERROR_ZERO_RETURN:
 304                 break;
 305
 306         /*
 307          *      These seem to be indications of a genuine
 308          *      error that should result in the SSL tunnel
 309          *      being regarded as "dead".
 310          */
 311         case SSL_ERROR_SYSCALL:
 312                 ROPTIONAL(REDEBUG, ERROR, "System call (I/O) error (%i)", ret);
 313                 return 0;
 314
 315         case SSL_ERROR_SSL:
 316                 ROPTIONAL(REDEBUG, ERROR, "TLS protocol error (%i)", ret);
 317                 return 0;
 318
 319         /*
 320          *      For any other errors that (a) exist, and (b)
 321          *      crop up - we need to interpret what to do with
 322          *      them - so "politely inform" the caller that
 323          *      the code needs updating here.
 324          */
 325         default:
 326                 ROPTIONAL(REDEBUG, ERROR, "TLS session error %i (%i)", error, ret);
 327                 return 0;
 328         }
 329
 330         return 1;
 331 }
 332
 333 #ifdef PSK_MAX_IDENTITY_LEN
 334 static bool identity_is_safe(const char *identity)
 335 {
 336         char c;
 337
 338         if (!identity) return true;
 339
 340         while ((c = *(identity++)) != '\0') {
 341                 if (isalpha((int) c) || isdigit((int) c) || isspace((int) c) ||
 342                     (c == '@') || (c == '-') || (c == '_') || (c == '.')) {
 343                         continue;
 344                 }
 345
 346                 return false;
 347         }
 348
 349         return true;
 350 }
 351
 352 /*
 353  *      When a client uses TLS-PSK to talk to a server, this callback
 354  *      is used by the server to determine the PSK to use.
 355  */
 356 static unsigned int psk_server_callback(SSL *ssl, const char *identity,
 357                                         unsigned char *psk,
 358                                         unsigned int max_psk_len)
 359 {
 360         unsigned int psk_len = 0;
 361         fr_tls_server_conf_t *conf;
 362         REQUEST *request;
 363
 364         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl,
 365                                                        FR_TLS_EX_INDEX_CONF);
 366         if (!conf) return 0;
 367
 368         request = (REQUEST *)SSL_get_ex_data(ssl,
 369                                              FR_TLS_EX_INDEX_REQUEST);
 370         if (request && conf->psk_query) {
 371                 size_t hex_len;
 372                 VALUE_PAIR *vp;
 373                 char buffer[2 * PSK_MAX_PSK_LEN + 4]; /* allow for too-long keys */
 374
 375                 /*
 376                  *      The passed identity is weird.  Deny it.
 377                  */
 378                 if (!identity_is_safe(identity)) {
 379                         RWDEBUG("Invalid characters in PSK identity %s", identity);
 380                         return 0;
 381                 }
 382
 383                 vp = pair_make_request("TLS-PSK-Identity", identity, T_OP_SET);
 384                 if (!vp) return 0;
 385
 386                 hex_len = radius_xlat(buffer, sizeof(buffer), request, conf->psk_query,
 387                                       NULL, NULL);
 388                 if (!hex_len) {
 389                         RWDEBUG("PSK expansion returned an empty string.");
 390                         return 0;
 391                 }
 392
 393                 /*
 394                  *      The returned key is truncated at MORE than
 395                  *      OpenSSL can handle.  That way we can detect
 396                  *      the truncation, and complain about it.
 397                  */
 398                 if (hex_len > (2 * max_psk_len)) {
 399                         RWDEBUG("Returned PSK is too long (%u > %u)",
 400                                 (unsigned int) hex_len, 2 * max_psk_len);
 401                         return 0;
 402                 }
 403
 404                 /*
 405                  *      Leave the TLS-PSK-Identity in the request, and
 406                  *      convert the expansion from printable string
 407                  *      back to hex.
 408                  */
 409                 return fr_hex2bin(psk, max_psk_len, buffer, hex_len);
 410         }
 411
 412         if (!conf->psk_identity) {
 413                 DEBUG("No static PSK identity set.  Rejecting the user");
 414                 return 0;
 415         }
 416
 417         /*
 418          *      No REQUEST, or no dynamic query.  Just look for a
 419          *      static identity.
 420          */
 421         if (strcmp(identity, conf->psk_identity) != 0) {
 422                 ERROR("Supplied PSK identity %s does not match configuration.  Rejecting.",
 423                       identity);
 424                 return 0;
 425         }
 426
 427         psk_len = strlen(conf->psk_password);
 428         if (psk_len > (2 * max_psk_len)) return 0;
 429
 430         return fr_hex2bin(psk, max_psk_len, conf->psk_password, psk_len);
 431 }
 432
 433 static unsigned int psk_client_callback(SSL *ssl, UNUSED char const *hint,
 434                                         char *identity, unsigned int max_identity_len,
 435                                         unsigned char *psk, unsigned int max_psk_len)
 436 {
 437         unsigned int psk_len;
 438         fr_tls_server_conf_t *conf;
 439
 440         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl,
 441                                                        FR_TLS_EX_INDEX_CONF);
 442         if (!conf) return 0;
 443
 444         psk_len = strlen(conf->psk_password);
 445         if (psk_len > (2 * max_psk_len)) return 0;
 446
 447         strlcpy(identity, conf->psk_identity, max_identity_len);
 448
 449         return fr_hex2bin(psk, max_psk_len, conf->psk_password, psk_len);
 450 }
 451
 452 #endif
 453
 454 #define MAX_SESSION_SIZE (256)
 455
 456
 457 void tls_session_id(SSL_SESSION *ssn, char *buffer, size_t bufsize)
 458 {
 459 #if OPENSSL_VERSION_NUMBER < 0x10001000L
 460         size_t size;
 461
 462         size = ssn->session_id_length;
 463         if (size > bufsize) size = bufsize;
 464
 465         fr_bin2hex(buffer, ssn->session_id, size);
 466 #else
 467         unsigned int size;
 468         uint8_t const *p;
 469
 470         p = SSL_SESSION_get_id(ssn, &size);
 471         if (size > bufsize) size = bufsize;
 472
 473         fr_bin2hex(buffer, p, size);
 474
 475 #endif
 476 }
 477
 478
 479
 480 static int _tls_session_free(tls_session_t *ssn)
 481 {
 482         /*
 483          *      Free any opaque TTLS or PEAP data.
 484          */
 485         if ((ssn->opaque) && (ssn->free_opaque)) {
 486                 ssn->free_opaque(ssn->opaque);
 487                 ssn->opaque = NULL;
 488         }
 489
 490         session_close(ssn);
 491
 492         return 0;
 493 }
 494
 495 tls_session_t *tls_new_client_session(TALLOC_CTX *ctx, fr_tls_server_conf_t *conf, int fd)
 496 {
 497         int ret;
 498         int verify_mode;
 499         tls_session_t *ssn = NULL;
 500         REQUEST *request;
 501
 502         ssn = talloc_zero(ctx, tls_session_t);
 503         if (!ssn) return NULL;
 504
 505         talloc_set_destructor(ssn, _tls_session_free);
 506
 507         ssn->ctx = conf->ctx;
 508
 509         SSL_CTX_set_mode(ssn->ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER | SSL_MODE_AUTO_RETRY);
 510
 511         ssn->ssl = SSL_new(ssn->ctx);
 512         if (!ssn->ssl) {
 513                 talloc_free(ssn);
 514                 return NULL;
 515         }
 516
 517         request = request_alloc(ssn);
 518         SSL_set_ex_data(ssn->ssl, FR_TLS_EX_INDEX_REQUEST, (void *)request);
 519
 520         /*
 521          *      Add the message callback to identify what type of
 522          *      message/handshake is passed
 523          */
 524         SSL_set_msg_callback(ssn->ssl, cbtls_msg);
 525         SSL_set_msg_callback_arg(ssn->ssl, ssn);
 526         SSL_set_info_callback(ssn->ssl, cbtls_info);
 527
 528         /*
 529          *      Always verify the peer certificate.
 530          */
 531         DEBUG2("Requiring Server certificate");
 532         verify_mode = SSL_VERIFY_PEER;
 533         verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
 534         SSL_set_verify(ssn->ssl, verify_mode, cbtls_verify);
 535
 536         SSL_set_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CONF, (void *)conf);
 537         SSL_set_ex_data(ssn->ssl, FR_TLS_EX_INDEX_SSN, (void *)ssn);
 538         SSL_set_fd(ssn->ssl, fd);
 539         ret = SSL_connect(ssn->ssl);
 540         if (ret <= 0) {
 541                 tls_error_io_log(NULL, ssn, ret, "Failed in " STRINGIFY(__FUNCTION__) " (SSL_connect)");
 542                 talloc_free(ssn);
 543
 544                 return NULL;
 545         }
 546
 547         ssn->mtu = conf->fragment_size;
 548
 549         return ssn;
 550 }
 551
 552 /** Create a new TLS session
 553  *
 554  * Configures a new TLS session, configuring options, setting callbacks etc...
 555  *
 556  * @param ctx to alloc session data in. Should usually be NULL unless the lifetime of the
 557  *      session is tied to another talloc'd object.
 558  * @param conf to use to configure the tls session.
 559  * @param request The current #REQUEST.
 560  * @param client_cert Whether to require a client_cert.
 561  * @return a new session on success, or NULL on error.
 562  */
 563 tls_session_t *tls_new_session(TALLOC_CTX *ctx, fr_tls_server_conf_t *conf, REQUEST *request, bool client_cert)
 564 {
 565         tls_session_t   *state = NULL;
 566         SSL             *new_tls = NULL;
 567         int             verify_mode = 0;
 568         VALUE_PAIR      *vp;
 569
 570         rad_assert(request != NULL);
 571
 572         RDEBUG2("Initiating new EAP-TLS session");
 573
 574         /*
 575          *      Manually flush the sessions every so often.  If HALF
 576          *      of the session lifetime has passed since we last
 577          *      flushed, then flush it again.
 578          *
 579          *      FIXME: Also do it every N sessions?
 580          */
 581         if (conf->session_cache_enable &&
 582             ((conf->session_last_flushed + ((int)conf->session_timeout * 1800)) <= request->timestamp)){
 583                 RDEBUG2("Flushing SSL sessions (of #%ld)", SSL_CTX_sess_number(conf->ctx));
 584
 585                 SSL_CTX_flush_sessions(conf->ctx, request->timestamp);
 586                 conf->session_last_flushed = request->timestamp;
 587         }
 588
 589         new_tls = SSL_new(conf->ctx);
 590         if (new_tls == NULL) {
 591                 tls_error_log(request, "Error creating new TLS session");
 592                 return NULL;
 593         }
 594
 595         /* We use the SSL's "app_data" to indicate a call-back */
 596         SSL_set_app_data(new_tls, NULL);
 597
 598         if ((state = talloc_zero(ctx, tls_session_t)) == NULL) {
 599                 RERROR("Error allocating memory for SSL state");
 600                 return NULL;
 601         }
 602         session_init(state);
 603         talloc_set_destructor(state, _tls_session_free);
 604
 605         state->ctx = conf->ctx;
 606         state->ssl = new_tls;
 607
 608         /*
 609          *      Initialize callbacks
 610          */
 611         state->record_init = record_init;
 612         state->record_close = record_close;
 613         state->record_plus = record_plus;
 614         state->record_minus = record_minus;
 615
 616         /*
 617          *      Create & hook the BIOs to handle the dirty side of the
 618          *      SSL.  This is *very important* as we want to handle
 619          *      the transmission part.  Now the only IO interface
 620          *      that SSL is aware of, is our defined BIO buffers.
 621          *
 622          *      This means that all SSL IO is done to/from memory,
 623          *      and we can update those BIOs from the packets we've
 624          *      received.
 625          */
 626         state->into_ssl = BIO_new(BIO_s_mem());
 627         state->from_ssl = BIO_new(BIO_s_mem());
 628         SSL_set_bio(state->ssl, state->into_ssl, state->from_ssl);
 629
 630         /*
 631          *      Add the message callback to identify what type of
 632          *      message/handshake is passed
 633          */
 634         SSL_set_msg_callback(new_tls, cbtls_msg);
 635         SSL_set_msg_callback_arg(new_tls, state);
 636         SSL_set_info_callback(new_tls, cbtls_info);
 637
 638         /*
 639          *      In Server mode we only accept.
 640          */
 641         SSL_set_accept_state(state->ssl);
 642
 643         /*
 644          *      Verify the peer certificate, if asked.
 645          */
 646         if (client_cert) {
 647                 RDEBUG2("Setting verify mode to require certificate from client");
 648                 verify_mode = SSL_VERIFY_PEER;
 649                 verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
 650                 verify_mode |= SSL_VERIFY_CLIENT_ONCE;
 651         }
 652         SSL_set_verify(state->ssl, verify_mode, cbtls_verify);
 653
 654         SSL_set_ex_data(state->ssl, FR_TLS_EX_INDEX_CONF, (void *)conf);
 655         SSL_set_ex_data(state->ssl, FR_TLS_EX_INDEX_SSN, (void *)state);
 656         state->length_flag = conf->include_length;
 657
 658         /*
 659          *      We use default fragment size, unless the Framed-MTU
 660          *      tells us it's too big.  Note that we do NOT account
 661          *      for the EAP-TLS headers if conf->fragment_size is
 662          *      large, because that config item looks to be confusing.
 663          *
 664          *      i.e. it should REALLY be called MTU, and the code here
 665          *      should figure out what that means for TLS fragment size.
 666          *      asking the administrator to know the internal details
 667          *      of EAP-TLS in order to calculate fragment sizes is
 668          *      just too much.
 669          */
 670         state->mtu = conf->fragment_size;
 671         vp = fr_pair_find_by_num(request->packet->vps, PW_FRAMED_MTU, 0, TAG_ANY);
 672         if (vp && (vp->vp_integer > 100) && (vp->vp_integer < state->mtu)) {
 673                 state->mtu = vp->vp_integer;
 674         }
 675
 676         if (conf->session_cache_enable) state->allow_session_resumption = true; /* otherwise it's false */
 677
 678         return state;
 679 }
 680
 681 /*
 682  * We are the server, we always get the dirty data
 683  * (Handshake data is also considered as dirty data)
 684  * During handshake, since SSL API handles itself,
 685  * After clean-up, dirty_out will be filled with
 686  * the data required for handshaking. So we check
 687  * if dirty_out is empty then we simply send it back.
 688  * As of now, if handshake is successful, then we keep going,
 689  * otherwise we fail.
 690  *
 691  * Fill the Bio with the dirty data to clean it
 692  * Get the cleaned data from SSL, if it is not Handshake data
 693  */
 694 int tls_handshake_recv(REQUEST *request, tls_session_t *ssn)
 695 {
 696         int err;
 697
 698         if (ssn->invalid_hb_used) return 0;
 699
 700         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data, ssn->dirty_in.used);
 701         if (err != (int) ssn->dirty_in.used) {
 702                 REDEBUG("Failed writing %zd bytes to SSL BIO: %d", ssn->dirty_in.used, err);
 703                 record_init(&ssn->dirty_in);
 704                 return 0;
 705         }
 706         record_init(&ssn->dirty_in);
 707
 708         err = SSL_read(ssn->ssl, ssn->clean_out.data + ssn->clean_out.used,
 709                        sizeof(ssn->clean_out.data) - ssn->clean_out.used);
 710         if (err > 0) {
 711                 ssn->clean_out.used += err;
 712                 return 1;
 713         }
 714
 715         if (!tls_error_io_log(request, ssn, err, "Failed in " STRINGIFY(__FUNCTION__) " (SSL_read)")) return 0;
 716
 717         /* Some Extra STATE information for easy debugging */
 718         if (SSL_is_init_finished(ssn->ssl)) RDEBUG2("SSL Connection Established");
 719         if (SSL_in_init(ssn->ssl)) RDEBUG2("In SSL Handshake Phase");
 720         if (SSL_in_before(ssn->ssl)) RDEBUG2("Before SSL Handshake Phase");
 721         if (SSL_in_accept_init(ssn->ssl)) RDEBUG2("In SSL Accept mode");
 722         if (SSL_in_connect_init(ssn->ssl)) RDEBUG2("In SSL Connect mode");
 723
 724 #if OPENSSL_VERSION_NUMBER >= 0x10001000L
 725         /*
 726          *      Cache the SSL_SESSION pointer.
 727          */
 728         if (!ssn->ssl_session && SSL_is_init_finished(ssn->ssl)) {
 729                 ssn->ssl_session = SSL_get_session(ssn->ssl);
 730                 if (!ssn->ssl_session) {
 731                         RDEBUG("Failed getting SSL session");
 732                         return 0;
 733                 }
 734         }
 735 #endif
 736
 737         err = BIO_ctrl_pending(ssn->from_ssl);
 738         if (err > 0) {
 739                 err = BIO_read(ssn->from_ssl, ssn->dirty_out.data,
 740                                sizeof(ssn->dirty_out.data));
 741                 if (err > 0) {
 742                         ssn->dirty_out.used = err;
 743
 744                 } else if (BIO_should_retry(ssn->from_ssl)) {
 745                         record_init(&ssn->dirty_in);
 746                         RDEBUG2("Asking for more data in tunnel");
 747                         return 1;
 748
 749                 } else {
 750                         tls_error_log(NULL, NULL);
 751                         record_init(&ssn->dirty_in);
 752                         return 0;
 753                 }
 754         } else {
 755                 RDEBUG2("SSL Application Data");
 756                 /* Its clean application data, do whatever we want */
 757                 record_init(&ssn->clean_out);
 758         }
 759
 760         /* We are done with dirty_in, reinitialize it */
 761         record_init(&ssn->dirty_in);
 762         return 1;
 763 }
 764
 765 /*
 766  *      Take cleartext user data, and encrypt it into the output buffer,
 767  *      to send to the client at the other end of the SSL connection.
 768  */
 769 int tls_handshake_send(REQUEST *request, tls_session_t *ssn)
 770 {
 771         int err;
 772
 773         /*
 774          *      If there's un-encrypted data in 'clean_in', then write
 775          *      that data to the SSL session, and then call the BIO function
 776          *      to get that encrypted data from the SSL session, into
 777          *      a buffer which we can then package into an EAP packet.
 778          *
 779          *      Based on Server's logic this clean_in is expected to
 780          *      contain the data to send to the client.
 781          */
 782         if (ssn->clean_in.used > 0) {
 783                 int written;
 784
 785                 written = SSL_write(ssn->ssl, ssn->clean_in.data, ssn->clean_in.used);
 786                 record_minus(&ssn->clean_in, NULL, written);
 787
 788                 /* Get the dirty data from Bio to send it */
 789                 err = BIO_read(ssn->from_ssl, ssn->dirty_out.data,
 790                                sizeof(ssn->dirty_out.data));
 791                 if (err > 0) {
 792                         ssn->dirty_out.used = err;
 793                 } else {
 794                         if (!tls_error_io_log(request, ssn, err,
 795                                               "Failed in " STRINGIFY(__FUNCTION__) " (SSL_write)")) {
 796                                 return 0;
 797                         }
 798                 }
 799         }
 800
 801         return 1;
 802 }
 803
 804 static void session_init(tls_session_t *ssn)
 805 {
 806         ssn->ssl = NULL;
 807         ssn->into_ssl = ssn->from_ssl = NULL;
 808         record_init(&ssn->clean_in);
 809         record_init(&ssn->clean_out);
 810         record_init(&ssn->dirty_in);
 811         record_init(&ssn->dirty_out);
 812
 813         memset(&ssn->info, 0, sizeof(ssn->info));
 814
 815         ssn->mtu = 0;
 816         ssn->fragment = false;
 817         ssn->tls_msg_len = 0;
 818         ssn->length_flag = false;
 819         ssn->opaque = NULL;
 820         ssn->free_opaque = NULL;
 821 }
 822
 823 static void session_close(tls_session_t *ssn)
 824 {
 825         SSL_set_quiet_shutdown(ssn->ssl, 1);
 826         SSL_shutdown(ssn->ssl);
 827
 828         if (ssn->ssl) {
 829                 SSL_free(ssn->ssl);
 830                 ssn->ssl = NULL;
 831         }
 832
 833         record_close(&ssn->clean_in);
 834         record_close(&ssn->clean_out);
 835         record_close(&ssn->dirty_in);
 836         record_close(&ssn->dirty_out);
 837         session_init(ssn);
 838 }
 839
 840 static void record_init(record_t *rec)
 841 {
 842         rec->used = 0;
 843 }
 844
 845 static void record_close(record_t *rec)
 846 {
 847         rec->used = 0;
 848 }
 849
 850
 851 /*
 852  *      Copy data to the intermediate buffer, before we send
 853  *      it somewhere.
 854  */
 855 static unsigned int record_plus(record_t *rec, void const *ptr,
 856                                 unsigned int size)
 857 {
 858         unsigned int added = MAX_RECORD_SIZE - rec->used;
 859
 860         if(added > size)
 861                 added = size;
 862         if(added == 0)
 863                 return 0;
 864         memcpy(rec->data + rec->used, ptr, added);
 865         rec->used += added;
 866         return added;
 867 }
 868
 869 /*
 870  *      Take data from the buffer, and give it to the caller.
 871  */
 872 static unsigned int record_minus(record_t *rec, void *ptr,
 873                                  unsigned int size)
 874 {
 875         unsigned int taken = rec->used;
 876
 877         if(taken > size)
 878                 taken = size;
 879         if(taken == 0)
 880                 return 0;
 881         if(ptr)
 882                 memcpy(ptr, rec->data, taken);
 883         rec->used -= taken;
 884
 885         /*
 886          *      This is pretty bad...
 887          */
 888         if (rec->used > 0) memmove(rec->data, rec->data + taken, rec->used);
 889
 890         return taken;
 891 }
 892
 893 void tls_session_information(tls_session_t *tls_session)
 894 {
 895         char const *str_write_p, *str_version, *str_content_type = "";
 896         char const *str_details1 = "", *str_details2= "";
 897         REQUEST *request;
 898         char buffer[32];
 899
 900         /*
 901          *      Don't print this out in the normal course of
 902          *      operations.
 903          */
 904         if (rad_debug_lvl == 0) return;
 905
 906         str_write_p = tls_session->info.origin ? ">>> send" : "<<< recv";
 907
 908         switch (tls_session->info.version) {
 909         case SSL2_VERSION:
 910                 str_version = "SSL 2.0 ";
 911                 break;
 912         case SSL3_VERSION:
 913                 str_version = "SSL 3.0 ";
 914                 break;
 915         case TLS1_VERSION:
 916                 str_version = "TLS 1.0 ";
 917                 break;
 918 #ifdef TLS1_1_VERSION
 919         case TLS1_1_VERSION:
 920                 str_version = "TLS 1.1 ";
 921                 break;
 922 #endif
 923 #ifdef TLS1_2_VERSION
 924         case TLS1_2_VERSION:
 925                 str_version = "TLS 1.2 ";
 926                 break;
 927 #endif
 928 #ifdef TLS1_3_VERSON
 929         case TLS1_3_VERSION:
 930                 str_version = "TLS 1.3 ";
 931                 break;
 932 #endif
 933
 934         default:
 935                 sprintf(buffer, "UNKNOWN TLS VERSION ?%04X?", tls_session->info.version);
 936                 str_version = buffer;
 937                 break;
 938         }
 939
 940         if (tls_session->info.version == SSL3_VERSION ||
 941             tls_session->info.version == TLS1_VERSION) {
 942                 switch (tls_session->info.content_type) {
 943                 case SSL3_RT_CHANGE_CIPHER_SPEC:
 944                         str_content_type = "ChangeCipherSpec";
 945                         break;
 946
 947                 case SSL3_RT_ALERT:
 948                         str_content_type = "Alert";
 949                         break;
 950
 951                 case SSL3_RT_HANDSHAKE:
 952                         str_content_type = "Handshake";
 953                         break;
 954
 955                 case SSL3_RT_APPLICATION_DATA:
 956                         str_content_type = "ApplicationData";
 957                         break;
 958
 959                 default:
 960                         str_content_type = "UnknownContentType";
 961                         break;
 962                 }
 963
 964                 if (tls_session->info.content_type == SSL3_RT_ALERT) {
 965                         str_details1 = ", ???";
 966
 967                         if (tls_session->info.record_len == 2) {
 968
 969                                 switch (tls_session->info.alert_level) {
 970                                 case SSL3_AL_WARNING:
 971                                         str_details1 = ", warning";
 972                                         break;
 973                                 case SSL3_AL_FATAL:
 974                                         str_details1 = ", fatal";
 975                                         break;
 976                                 }
 977
 978                                 str_details2 = " ???";
 979                                 switch (tls_session->info.alert_description) {
 980                                 case SSL3_AD_CLOSE_NOTIFY:
 981                                         str_details2 = " close_notify";
 982                                         break;
 983
 984                                 case SSL3_AD_UNEXPECTED_MESSAGE:
 985                                         str_details2 = " unexpected_message";
 986                                         break;
 987
 988                                 case SSL3_AD_BAD_RECORD_MAC:
 989                                         str_details2 = " bad_record_mac";
 990                                         break;
 991
 992                                 case TLS1_AD_DECRYPTION_FAILED:
 993                                         str_details2 = " decryption_failed";
 994                                         break;
 995
 996                                 case TLS1_AD_RECORD_OVERFLOW:
 997                                         str_details2 = " record_overflow";
 998                                         break;
 999
1000                                 case SSL3_AD_DECOMPRESSION_FAILURE:
1001                                         str_details2 = " decompression_failure";
1002                                         break;
1003
1004                                 case SSL3_AD_HANDSHAKE_FAILURE:
1005                                         str_details2 = " handshake_failure";
1006                                         break;
1007
1008                                 case SSL3_AD_BAD_CERTIFICATE:
1009                                         str_details2 = " bad_certificate";
1010                                         break;
1011
1012                                 case SSL3_AD_UNSUPPORTED_CERTIFICATE:
1013                                         str_details2 = " unsupported_certificate";
1014                                         break;
1015
1016                                 case SSL3_AD_CERTIFICATE_REVOKED:
1017                                         str_details2 = " certificate_revoked";
1018                                         break;
1019
1020                                 case SSL3_AD_CERTIFICATE_EXPIRED:
1021                                         str_details2 = " certificate_expired";
1022                                         break;
1023
1024                                 case SSL3_AD_CERTIFICATE_UNKNOWN:
1025                                         str_details2 = " certificate_unknown";
1026                                         break;
1027
1028                                 case SSL3_AD_ILLEGAL_PARAMETER:
1029                                         str_details2 = " illegal_parameter";
1030                                         break;
1031
1032                                 case TLS1_AD_UNKNOWN_CA:
1033                                         str_details2 = " unknown_ca";
1034                                         break;
1035
1036                                 case TLS1_AD_ACCESS_DENIED:
1037                                         str_details2 = " access_denied";
1038                                         break;
1039
1040                                 case TLS1_AD_DECODE_ERROR:
1041                                         str_details2 = " decode_error";
1042                                         break;
1043
1044                                 case TLS1_AD_DECRYPT_ERROR:
1045                                         str_details2 = " decrypt_error";
1046                                         break;
1047
1048                                 case TLS1_AD_EXPORT_RESTRICTION:
1049                                         str_details2 = " export_restriction";
1050                                         break;
1051
1052                                 case TLS1_AD_PROTOCOL_VERSION:
1053                                         str_details2 = " protocol_version";
1054                                         break;
1055
1056                                 case TLS1_AD_INSUFFICIENT_SECURITY:
1057                                         str_details2 = " insufficient_security";
1058                                         break;
1059
1060                                 case TLS1_AD_INTERNAL_ERROR:
1061                                         str_details2 = " internal_error";
1062                                         break;
1063
1064                                 case TLS1_AD_USER_CANCELLED:
1065                                         str_details2 = " user_canceled";
1066                                         break;
1067
1068                                 case TLS1_AD_NO_RENEGOTIATION:
1069                                         str_details2 = " no_renegotiation";
1070                                         break;
1071                                 }
1072                         }
1073                 }
1074
1075                 if (tls_session->info.content_type == SSL3_RT_HANDSHAKE) {
1076                         str_details1 = "???";
1077
1078                         if (tls_session->info.record_len > 0) switch (tls_session->info.handshake_type) {
1079                         case SSL3_MT_HELLO_REQUEST:
1080                                 str_details1 = ", HelloRequest";
1081                                 break;
1082
1083                         case SSL3_MT_CLIENT_HELLO:
1084                                 str_details1 = ", ClientHello";
1085                                 break;
1086
1087                         case SSL3_MT_SERVER_HELLO:
1088                                 str_details1 = ", ServerHello";
1089                                 break;
1090
1091                         case SSL3_MT_CERTIFICATE:
1092                                 str_details1 = ", Certificate";
1093                                 break;
1094
1095                         case SSL3_MT_SERVER_KEY_EXCHANGE:
1096                                 str_details1 = ", ServerKeyExchange";
1097                                 break;
1098
1099                         case SSL3_MT_CERTIFICATE_REQUEST:
1100                                 str_details1 = ", CertificateRequest";
1101                                 break;
1102
1103                         case SSL3_MT_SERVER_DONE:
1104                                 str_details1 = ", ServerHelloDone";
1105                                 break;
1106
1107                         case SSL3_MT_CERTIFICATE_VERIFY:
1108                                 str_details1 = ", CertificateVerify";
1109                                 break;
1110
1111                         case SSL3_MT_CLIENT_KEY_EXCHANGE:
1112                                 str_details1 = ", ClientKeyExchange";
1113                                 break;
1114
1115                         case SSL3_MT_FINISHED:
1116                                 str_details1 = ", Finished";
1117                                 break;
1118                         }
1119                 }
1120         }
1121
1122         snprintf(tls_session->info.info_description,
1123                  sizeof(tls_session->info.info_description),
1124                  "%s %s%s [length %04lx]%s%s\n",
1125                  str_write_p, str_version, str_content_type,
1126                  (unsigned long)tls_session->info.record_len,
1127                  str_details1, str_details2);
1128
1129         request = SSL_get_ex_data(tls_session->ssl, FR_TLS_EX_INDEX_REQUEST);
1130         ROPTIONAL(RDEBUG2, DEBUG2, "%s", tls_session->info.info_description);
1131 }
1132
1133 static CONF_PARSER cache_config[] = {
1134         { "enable", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, session_cache_enable), "no" },
1135
1136         { "lifetime", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, session_timeout), "24" },
1137         { "name", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, session_id_name), NULL },
1138
1139         { "max_entries", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, session_cache_size), "255" },
1140         { "persist_dir", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, session_cache_path), NULL },
1141         CONF_PARSER_TERMINATOR
1142 };
1143
1144 static CONF_PARSER verify_config[] = {
1145         { "skip_if_ocsp_ok", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, verify_skip_if_ocsp_ok), "no" },
1146         { "tmpdir", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, verify_tmp_dir), NULL },
1147         { "client", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, verify_client_cert_cmd), NULL },
1148         CONF_PARSER_TERMINATOR
1149 };
1150
1151 #ifdef HAVE_OPENSSL_OCSP_H
1152 static CONF_PARSER ocsp_config[] = {
1153         { "enable", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_enable), "no" },
1154         { "override_cert_url", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_override_url), "no" },
1155         { "url", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, ocsp_url), NULL },
1156         { "use_nonce", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_use_nonce), "yes" },
1157         { "timeout", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, ocsp_timeout), "yes" },
1158         { "softfail", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_softfail), "no" },
1159         CONF_PARSER_TERMINATOR
1160 };
1161 #endif
1162
1163 static CONF_PARSER tls_server_config[] = {
1164         { "verify_depth", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, verify_depth), "0" },
1165         { "CA_path", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT | PW_TYPE_DEPRECATED, fr_tls_server_conf_t, ca_path), NULL },
1166         { "ca_path", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_path), NULL },
1167         { "pem_file_type", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, file_type), "yes" },
1168         { "private_key_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, private_key_file), NULL },
1169         { "certificate_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, certificate_file), NULL },
1170         { "CA_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT | PW_TYPE_DEPRECATED, fr_tls_server_conf_t, ca_file), NULL },
1171         { "ca_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_file), NULL },
1172         { "private_key_password", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_SECRET, fr_tls_server_conf_t, private_key_password), NULL },
1173 #ifdef PSK_MAX_IDENTITY_LEN
1174         { "psk_identity", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, psk_identity), NULL },
1175         { "psk_hexphrase", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_SECRET, fr_tls_server_conf_t, psk_password), NULL },
1176         { "psk_query", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, psk_query), NULL },
1177 #endif
1178         { "dh_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, dh_file), NULL },
1179         { "random_file", FR_CONF_OFFSET(PW_TYPE_FILE_EXISTS, fr_tls_server_conf_t, random_file), NULL },
1180         { "fragment_size", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, fragment_size), "1024" },
1181         { "include_length", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, include_length), "yes" },
1182         { "auto_chain", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, auto_chain), "yes" },
1183         { "disable_single_dh_use", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_single_dh_use), NULL },
1184         { "check_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, check_crl), "no" },
1185 #ifdef X509_V_FLAG_CRL_CHECK_ALL
1186         { "check_all_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, check_all_crl), "no" },
1187 #endif
1188         { "allow_expired_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, allow_expired_crl), NULL },
1189         { "check_cert_cn", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_cn), NULL },
1190         { "cipher_list", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, cipher_list), NULL },
1191         { "check_cert_issuer", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_issuer), NULL },
1192         { "require_client_cert", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, require_client_cert), NULL },
1193
1194 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
1195 #ifndef OPENSSL_NO_ECDH
1196         { "ecdh_curve", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, ecdh_curve), "prime256v1" },
1197 #endif
1198 #endif
1199
1200 #ifdef SSL_OP_NO_TLSv1
1201         { "disable_tlsv1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1), NULL },
1202 #endif
1203
1204 #ifdef SSL_OP_NO_TLSv1_1
1205         { "disable_tlsv1_1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_1), NULL },
1206 #endif
1207
1208 #ifdef SSL_OP_NO_TLSv1_2
1209         { "disable_tlsv1_2", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_2), NULL },
1210 #endif
1211
1212         { "cache", FR_CONF_POINTER(PW_TYPE_SUBSECTION, NULL), (void const *) cache_config },
1213
1214         { "verify", FR_CONF_POINTER(PW_TYPE_SUBSECTION, NULL), (void const *) verify_config },
1215
1216 #ifdef HAVE_OPENSSL_OCSP_H
1217         { "ocsp", FR_CONF_POINTER(PW_TYPE_SUBSECTION, NULL), (void const *) ocsp_config },
1218 #endif
1219         CONF_PARSER_TERMINATOR
1220 };
1221
1222
1223 static CONF_PARSER tls_client_config[] = {
1224         { "verify_depth", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, verify_depth), "0" },
1225         { "ca_path", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_path), NULL },
1226         { "pem_file_type", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, file_type), "yes" },
1227         { "private_key_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, private_key_file), NULL },
1228         { "certificate_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, certificate_file), NULL },
1229         { "ca_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_file), NULL },
1230         { "private_key_password", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_SECRET, fr_tls_server_conf_t, private_key_password), NULL },
1231         { "dh_file", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, dh_file), NULL },
1232         { "random_file", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, random_file), NULL },
1233         { "fragment_size", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, fragment_size), "1024" },
1234         { "include_length", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, include_length), "yes" },
1235         { "check_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, check_crl), "no" },
1236         { "check_cert_cn", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_cn), NULL },
1237         { "cipher_list", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, cipher_list), NULL },
1238         { "check_cert_issuer", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_issuer), NULL },
1239
1240 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
1241 #ifndef OPENSSL_NO_ECDH
1242         { "ecdh_curve", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, ecdh_curve), "prime256v1" },
1243 #endif
1244 #endif
1245
1246 #ifdef SSL_OP_NO_TLSv1
1247         { "disable_tlsv1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1), NULL },
1248 #endif
1249
1250 #ifdef SSL_OP_NO_TLSv1_1
1251         { "disable_tlsv1_1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_1), NULL },
1252 #endif
1253
1254 #ifdef SSL_OP_NO_TLSv1_2
1255         { "disable_tlsv1_2", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_2), NULL },
1256 #endif
1257         CONF_PARSER_TERMINATOR
1258 };
1259
1260
1261 /*
1262  *      TODO: Check for the type of key exchange * like conf->dh_key
1263  */
1264 static int load_dh_params(SSL_CTX *ctx, char *file)
1265 {
1266         DH *dh = NULL;
1267         BIO *bio;
1268
1269         if (!file) return 0;
1270
1271         if ((bio = BIO_new_file(file, "r")) == NULL) {
1272                 ERROR(LOG_PREFIX ": Unable to open DH file - %s", file);
1273                 return -1;
1274         }
1275
1276         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
1277         BIO_free(bio);
1278         if (!dh) {
1279                 WARN(LOG_PREFIX ": Unable to set DH parameters.  DH cipher suites may not work!");
1280                 WARN(LOG_PREFIX ": Fix this by running the OpenSSL command listed in eap.conf");
1281                 return 0;
1282         }
1283
1284         if (SSL_CTX_set_tmp_dh(ctx, dh) < 0) {
1285                 ERROR(LOG_PREFIX ": Unable to set DH parameters");
1286                 DH_free(dh);
1287                 return -1;
1288         }
1289
1290         DH_free(dh);
1291         return 0;
1292 }
1293
1294
1295 /*
1296  *      Print debugging messages, and free data.
1297  */
1298 static void cbtls_remove_session(SSL_CTX *ctx, SSL_SESSION *sess)
1299 {
1300         char                    buffer[2 * MAX_SESSION_SIZE + 1];
1301         fr_tls_server_conf_t    *conf;
1302
1303         tls_session_id(sess, buffer, MAX_SESSION_SIZE);
1304
1305         conf = (fr_tls_server_conf_t *)SSL_CTX_get_app_data(ctx);
1306         if (!conf) {
1307                 DEBUG(LOG_PREFIX ": Failed to find TLS configuration in session");
1308                 return;
1309         }
1310
1311         {
1312                 int rv;
1313                 char filename[256];
1314
1315                 DEBUG2(LOG_PREFIX ": Removing session %s from the cache", buffer);
1316
1317                 /* remove session and any cached VPs */
1318                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
1319                          conf->session_cache_path, FR_DIR_SEP, buffer);
1320                 rv = unlink(filename);
1321                 if (rv != 0) {
1322                         DEBUG2(LOG_PREFIX ": Could not remove persisted session file %s: %s",
1323                                filename, fr_syserror(errno));
1324                 }
1325                 /* VPs might be absent; might not have been written to disk yet */
1326                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
1327                          conf->session_cache_path, FR_DIR_SEP, buffer);
1328                 unlink(filename);
1329         }
1330
1331         return;
1332 }
1333
1334 static int cbtls_new_session(SSL *ssl, SSL_SESSION *sess)
1335 {
1336         char                    buffer[2 * MAX_SESSION_SIZE + 1];
1337         fr_tls_server_conf_t    *conf;
1338         unsigned char           *sess_blob = NULL;
1339
1340         REQUEST                 *request = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
1341
1342         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1343         if (!conf) {
1344                 RWDEBUG("Failed to find TLS configuration in session");
1345                 return 0;
1346         }
1347
1348         tls_session_id(sess, buffer, MAX_SESSION_SIZE);
1349
1350         {
1351                 int fd, rv, todo, blob_len;
1352                 char filename[256];
1353                 unsigned char *p;
1354
1355                 RDEBUG2("Serialising session %s, and storing in cache", buffer);
1356
1357                 /* find out what length data we need */
1358                 blob_len = i2d_SSL_SESSION(sess, NULL);
1359                 if (blob_len < 1) {
1360                         /* something went wrong */
1361                         RWDEBUG("Session serialisation failed, couldn't determine required buffer length");
1362                         return 0;
1363                 }
1364
1365
1366                 /* Do not convert to TALLOC - Thread safety */
1367                 /* alloc and convert to ASN.1 */
1368                 sess_blob = malloc(blob_len);
1369                 if (!sess_blob) {
1370                         RWDEBUG("Session serialisation failed, couldn't allocate buffer (%d bytes)", blob_len);
1371                         return 0;
1372                 }
1373                 /* openssl mutates &p */
1374                 p = sess_blob;
1375                 rv = i2d_SSL_SESSION(sess, &p);
1376                 if (rv != blob_len) {
1377                         RWDEBUG("Session serialisation failed");
1378                         goto error;
1379                 }
1380
1381                 /* open output file */
1382                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
1383                          conf->session_cache_path, FR_DIR_SEP, buffer);
1384                 fd = open(filename, O_RDWR|O_CREAT|O_EXCL, 0600);
1385                 if (fd < 0) {
1386                         RERROR("Session serialisation failed, failed opening session file %s: %s",
1387                               filename, fr_syserror(errno));
1388                         goto error;
1389                 }
1390
1391                 todo = blob_len;
1392                 p = sess_blob;
1393                 while (todo > 0) {
1394                         rv = write(fd, p, todo);
1395                         if (rv < 1) {
1396                                 RWDEBUG("Failed writing session: %s", fr_syserror(errno));
1397                                 close(fd);
1398                                 goto error;
1399                         }
1400                         p += rv;
1401                         todo -= rv;
1402                 }
1403                 close(fd);
1404                 RWDEBUG("Wrote session %s to %s (%d bytes)", buffer, filename, blob_len);
1405         }
1406
1407 error:
1408         free(sess_blob);
1409
1410         return 0;
1411 }
1412
1413 static SSL_SESSION *cbtls_get_session(SSL *ssl, unsigned char *data, int len, int *copy)
1414 {
1415         size_t                  size;
1416         char                    buffer[2 * MAX_SESSION_SIZE + 1];
1417         fr_tls_server_conf_t    *conf;
1418         TALLOC_CTX              *talloc_ctx;
1419
1420         SSL_SESSION             *sess = NULL;
1421         unsigned char           *sess_data = NULL;
1422         PAIR_LIST               *pairlist = NULL;
1423
1424         REQUEST                 *request = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
1425
1426         rad_assert(request != NULL);
1427
1428         size = len;
1429         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
1430
1431         fr_bin2hex(buffer, data, size);
1432
1433         RDEBUG2("Peer requested cached session: %s", buffer);
1434
1435         *copy = 0;
1436
1437         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1438         if (!conf) {
1439                 RWDEBUG("Failed to find TLS configuration in session");
1440                 return NULL;
1441         }
1442
1443         talloc_ctx = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_TALLOC);
1444
1445         {
1446                 int             rv, fd, todo;
1447                 char            filename[256];
1448
1449                 unsigned char const     **o;
1450                 unsigned char           **p;
1451                 uint8_t                 *q;
1452
1453                 struct stat     st;
1454                 VALUE_PAIR      *vps = NULL;
1455
1456                 /* read in the cached VPs from the .vps file */
1457                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
1458                          conf->session_cache_path, FR_DIR_SEP, buffer);
1459                 rv = pairlist_read(talloc_ctx, filename, &pairlist, 1);
1460                 if (rv < 0) {
1461                         /* not safe to un-persist a session w/o VPs */
1462                         RWDEBUG("Failed loading persisted VPs for session %s", buffer);
1463                         goto err;
1464                 }
1465
1466                 /* load the actual SSL session */
1467                 snprintf(filename, sizeof(filename), "%s%c%s.asn1", conf->session_cache_path, FR_DIR_SEP, buffer);
1468                 fd = open(filename, O_RDONLY);
1469                 if (fd < 0) {
1470                         RWDEBUG("No persisted session file %s: %s", filename, fr_syserror(errno));
1471                         goto err;
1472                 }
1473
1474                 rv = fstat(fd, &st);
1475                 if (rv < 0) {
1476                         RWDEBUG("Failed stating persisted session file %s: %s", filename, fr_syserror(errno));
1477                         close(fd);
1478                         goto err;
1479                 }
1480
1481                 sess_data = talloc_array(NULL, unsigned char, st.st_size);
1482                 if (!sess_data) {
1483                         RWDEBUG("Failed allocating buffer for persisted session (%d bytes)", (int) st.st_size);
1484                         close(fd);
1485                         goto err;
1486                 }
1487
1488                 q = sess_data;
1489                 todo = st.st_size;
1490                 while (todo > 0) {
1491                         rv = read(fd, q, todo);
1492                         if (rv < 1) {
1493                                 RWDEBUG("Failed reading persisted session: %s", fr_syserror(errno));
1494                                 close(fd);
1495                                 goto err;
1496                         }
1497                         todo -= rv;
1498                         q += rv;
1499                 }
1500                 close(fd);
1501
1502                 /*
1503                  *      OpenSSL mutates what's passed in, so we assign sess_data to q,
1504                  *      so the value of q gets mutated, and not the value of sess_data.
1505                  *
1506                  *      We then need a pointer to hold &q, but it can't be const, because
1507                  *      clang complains about lack of consting in nested pointer types.
1508                  *
1509                  *      So we memcpy the value of that pointer, to one that
1510                  *      does have a const, which we then pass into d2i_SSL_SESSION *sigh*.
1511                  */
1512                 q = sess_data;
1513                 p = &q;
1514                 memcpy(&o, &p, sizeof(o));
1515                 sess = d2i_SSL_SESSION(NULL, o, st.st_size);
1516                 if (!sess) {
1517                         RWDEBUG("Failed loading persisted session: %s", ERR_error_string(ERR_get_error(), NULL));
1518                         goto err;
1519                 }
1520
1521                 /* move the cached VPs into the session */
1522                 fr_pair_list_mcopy_by_num(talloc_ctx, &vps, &pairlist->reply, 0, 0, TAG_ANY);
1523
1524                 SSL_SESSION_set_ex_data(sess, fr_tls_ex_index_vps, vps);
1525                 RWDEBUG("Successfully restored session %s", buffer);
1526                 rdebug_pair_list(L_DBG_LVL_2, request, vps, "reply:");
1527         }
1528 err:
1529         if (sess_data) talloc_free(sess_data);
1530         if (pairlist) pairlist_free(&pairlist);
1531
1532         return sess;
1533 }
1534
1535 #ifdef HAVE_OPENSSL_OCSP_H
1536
1537 /** Extract components of OCSP responser URL from a certificate
1538  *
1539  * @param[in] cert to extract URL from.
1540  * @param[out] host_out Portion of the URL (must be freed with free()).
1541  * @param[out] port_out Port portion of the URL (must be freed with free()).
1542  * @param[out] path_out Path portion of the URL (must be freed with free()).
1543  * @param[out] is_https Whether the responder should be contacted using https.
1544  * @return
1545  *      - 0 if no valid URL is contained in the certificate.
1546  *      - 1 if a URL was found and parsed.
1547  *      - -1 if at least one URL was found, but none could be parsed.
1548  */
1549 static int ocsp_parse_cert_url(X509 *cert, char **host_out, char **port_out,
1550                                char **path_out, int *is_https)
1551 {
1552         int                     i;
1553         bool                    found_uri = false;
1554
1555         AUTHORITY_INFO_ACCESS   *aia;
1556         ACCESS_DESCRIPTION      *ad;
1557
1558         aia = X509_get_ext_d2i(cert, NID_info_access, NULL, NULL);
1559
1560         for (i = 0; i < sk_ACCESS_DESCRIPTION_num(aia); i++) {
1561                 ad = sk_ACCESS_DESCRIPTION_value(aia, i);
1562                 if (OBJ_obj2nid(ad->method) != NID_ad_OCSP) continue;
1563                 if (ad->location->type != GEN_URI) continue;
1564                 found_uri = true;
1565
1566                 if (OCSP_parse_url((char *) ad->location->d.ia5->data, host_out,
1567                                    port_out, path_out, is_https)) return 1;
1568         }
1569         return found_uri ? -1 : 0;
1570 }
1571
1572 /*
1573  * This function sends a OCSP request to a defined OCSP responder
1574  * and checks the OCSP response for correctness.
1575  */
1576
1577 /* Maximum leeway in validity period: default 5 minutes */
1578 #define MAX_VALIDITY_PERIOD     (5 * 60)
1579
1580 typedef enum {
1581         OCSP_STATUS_FAILED      = 0,
1582         OCSP_STATUS_OK          = 1,
1583         OCSP_STATUS_SKIPPED     = 2,
1584 } ocsp_status_t;
1585
1586 static ocsp_status_t ocsp_check(REQUEST *request, X509_STORE *store, X509 *issuer_cert, X509 *client_cert,
1587                                 fr_tls_server_conf_t *conf)
1588 {
1589         OCSP_CERTID     *certid;
1590         OCSP_REQUEST    *req;
1591         OCSP_RESPONSE   *resp = NULL;
1592         OCSP_BASICRESP  *bresp = NULL;
1593         char            *host = NULL;
1594         char            *port = NULL;
1595         char            *path = NULL;
1596         char            hostheader[1024];
1597         int             use_ssl = -1;
1598         long            nsec = MAX_VALIDITY_PERIOD, maxage = -1;
1599         BIO             *cbio, *bio_out;
1600         ocsp_status_t   ocsp_status = OCSP_STATUS_FAILED;
1601         int             status;
1602         ASN1_GENERALIZEDTIME *rev, *thisupd, *nextupd;
1603         int             reason;
1604 #if OPENSSL_VERSION_NUMBER >= 0x1000003f
1605         OCSP_REQ_CTX    *ctx;
1606         int             rc;
1607         struct timeval  now;
1608         struct timeval  when;
1609 #endif
1610         VALUE_PAIR      *vp;
1611
1612         /*
1613          * Create OCSP Request
1614          */
1615         certid = OCSP_cert_to_id(NULL, client_cert, issuer_cert);
1616         req = OCSP_REQUEST_new();
1617         OCSP_request_add0_id(req, certid);
1618         if (conf->ocsp_use_nonce) OCSP_request_add1_nonce(req, NULL, 8);
1619
1620         /*
1621          * Send OCSP Request and get OCSP Response
1622          */
1623
1624         /* Get OCSP responder URL */
1625         if (conf->ocsp_override_url) {
1626                 char *url;
1627
1628         use_ocsp_url:
1629                 memcpy(&url, &conf->ocsp_url, sizeof(url));
1630                 /* Reading the libssl src, they do a strdup on the URL, so it could of been const *sigh* */
1631                 OCSP_parse_url(url, &host, &port, &path, &use_ssl);
1632                 if (!host || !port || !path) {
1633                         RWDEBUG("ocsp: Host or port or path missing from configured URL \"%s\".  Not doing OCSP", url);
1634                         goto skipped;
1635                 }
1636         } else {
1637                 int ret;
1638
1639                 ret = ocsp_parse_cert_url(client_cert, &host, &port, &path, &use_ssl);
1640                 switch (ret) {
1641                 case -1:
1642                         RWDEBUG("ocsp: Invalid URL in certificate.  Not doing OCSP");
1643                         break;
1644
1645                 case 0:
1646                         if (conf->ocsp_url) {
1647                                 RWDEBUG("ocsp: No OCSP URL in certificate, falling back to configured URL");
1648                                 goto use_ocsp_url;
1649                         }
1650                         RWDEBUG("ocsp: No OCSP URL in certificate.  Not doing OCSP");
1651                         goto skipped;
1652
1653                 case 1:
1654                         break;
1655                 }
1656         }
1657
1658         RDEBUG2("ocsp: Using responder URL \"http://%s:%s%s\"", host, port, path);
1659
1660         /* Check host and port length are sane, then create Host: HTTP header */
1661         if ((strlen(host) + strlen(port) + 2) > sizeof(hostheader)) {
1662                 RWDEBUG("ocsp: Host and port too long");
1663                 goto skipped;
1664         }
1665         snprintf(hostheader, sizeof(hostheader), "%s:%s", host, port);
1666
1667         /* Setup BIO socket to OCSP responder */
1668         cbio = BIO_new_connect(host);
1669
1670         bio_out = NULL;
1671         if (rad_debug_lvl) {
1672                 if (default_log.dst == L_DST_STDOUT) {
1673                         bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
1674                 } else if (default_log.dst == L_DST_STDERR) {
1675                         bio_out = BIO_new_fp(stderr, BIO_NOCLOSE);
1676                 }
1677         }
1678
1679         BIO_set_conn_port(cbio, port);
1680 #if OPENSSL_VERSION_NUMBER < 0x1000003f
1681         BIO_do_connect(cbio);
1682
1683         /* Send OCSP request and wait for response */
1684         resp = OCSP_sendreq_bio(cbio, path, req);
1685         if (!resp) {
1686                 REDEBUG("ocsp: Couldn't get OCSP response");
1687                 ocsp_status = OCSP_STATUS_SKIPPED;
1688                 goto ocsp_end;
1689         }
1690 #else
1691         if (conf->ocsp_timeout)
1692                 BIO_set_nbio(cbio, 1);
1693
1694         rc = BIO_do_connect(cbio);
1695         if ((rc <= 0) && ((!conf->ocsp_timeout) || !BIO_should_retry(cbio))) {
1696                 REDEBUG("ocsp: Couldn't connect to OCSP responder");
1697                 ocsp_status = OCSP_STATUS_SKIPPED;
1698                 goto ocsp_end;
1699         }
1700
1701         ctx = OCSP_sendreq_new(cbio, path, NULL, -1);
1702         if (!ctx) {
1703                 REDEBUG("ocsp: Couldn't create OCSP request");
1704                 ocsp_status = OCSP_STATUS_SKIPPED;
1705                 goto ocsp_end;
1706         }
1707
1708         if (!OCSP_REQ_CTX_add1_header(ctx, "Host", hostheader)) {
1709                 REDEBUG("ocsp: Couldn't set Host header");
1710                 ocsp_status = OCSP_STATUS_SKIPPED;
1711                 goto ocsp_end;
1712         }
1713
1714         if (!OCSP_REQ_CTX_set1_req(ctx, req)) {
1715                 REDEBUG("ocsp: Couldn't add data to OCSP request");
1716                 ocsp_status = OCSP_STATUS_SKIPPED;
1717                 goto ocsp_end;
1718         }
1719
1720         gettimeofday(&when, NULL);
1721         when.tv_sec += conf->ocsp_timeout;
1722
1723         do {
1724                 rc = OCSP_sendreq_nbio(&resp, ctx);
1725                 if (conf->ocsp_timeout) {
1726                         gettimeofday(&now, NULL);
1727                         if (!timercmp(&now, &when, <))
1728                                 break;
1729                 }
1730         } while ((rc == -1) && BIO_should_retry(cbio));
1731
1732         if (conf->ocsp_timeout && (rc == -1) && BIO_should_retry(cbio)) {
1733                 REDEBUG("ocsp: Response timed out");
1734                 ocsp_status = OCSP_STATUS_SKIPPED;
1735                 goto ocsp_end;
1736         }
1737
1738         OCSP_REQ_CTX_free(ctx);
1739
1740         if (rc == 0) {
1741                 REDEBUG("ocsp: Couldn't get OCSP response");
1742                 ocsp_status = OCSP_STATUS_SKIPPED;
1743                 goto ocsp_end;
1744         }
1745 #endif
1746
1747         /* Verify OCSP response status */
1748         status = OCSP_response_status(resp);
1749         if (status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
1750                 REDEBUG("ocsp: Response status: %s", OCSP_response_status_str(status));
1751                 goto ocsp_end;
1752         }
1753         bresp = OCSP_response_get1_basic(resp);
1754         if (conf->ocsp_use_nonce && OCSP_check_nonce(req, bresp)!=1) {
1755                 REDEBUG("ocsp: Response has wrong nonce value");
1756                 goto ocsp_end;
1757         }
1758         if (OCSP_basic_verify(bresp, NULL, store, 0)!=1){
1759                 REDEBUG("ocsp: Couldn't verify OCSP basic response");
1760                 goto ocsp_end;
1761         }
1762
1763         /*      Verify OCSP cert status */
1764         if (!OCSP_resp_find_status(bresp, certid, &status, &reason, &rev, &thisupd, &nextupd)) {
1765                 REDEBUG("ocsp: No Status found");
1766                 goto ocsp_end;
1767         }
1768
1769         if (!OCSP_check_validity(thisupd, nextupd, nsec, maxage)) {
1770                 if (bio_out) {
1771                         BIO_puts(bio_out, "WARNING: Status times invalid.\n");
1772                         ERR_print_errors(bio_out);
1773                 }
1774                 goto ocsp_end;
1775         }
1776
1777         if (bio_out) {
1778                 BIO_puts(bio_out, "\tThis Update: ");
1779                 ASN1_GENERALIZEDTIME_print(bio_out, thisupd);
1780                 BIO_puts(bio_out, "\n");
1781                 if (nextupd) {
1782                         BIO_puts(bio_out, "\tNext Update: ");
1783                         ASN1_GENERALIZEDTIME_print(bio_out, nextupd);
1784                         BIO_puts(bio_out, "\n");
1785                 }
1786         }
1787
1788         switch (status) {
1789         case V_OCSP_CERTSTATUS_GOOD:
1790                 RDEBUG2("ocsp: Cert status: good");
1791                 vp = pair_make_request("TLS-OCSP-Cert-Valid", NULL, T_OP_SET);
1792                 vp->vp_integer = 1;     /* yes */
1793                 ocsp_status = OCSP_STATUS_OK;
1794                 break;
1795
1796         default:
1797                 /* REVOKED / UNKNOWN */
1798                 REDEBUG("ocsp: Cert status: %s", OCSP_cert_status_str(status));
1799                 if (reason != -1) REDEBUG("ocsp: Reason: %s", OCSP_crl_reason_str(reason));
1800
1801                 if (bio_out) {
1802                         BIO_puts(bio_out, "\tRevocation Time: ");
1803                         ASN1_GENERALIZEDTIME_print(bio_out, rev);
1804                         BIO_puts(bio_out, "\n");
1805                 }
1806                 break;
1807         }
1808
1809 ocsp_end:
1810         /* Free OCSP Stuff */
1811         OCSP_REQUEST_free(req);
1812         OCSP_RESPONSE_free(resp);
1813         free(host);
1814         free(port);
1815         free(path);
1816         BIO_free_all(cbio);
1817         if (bio_out) BIO_free(bio_out);
1818         OCSP_BASICRESP_free(bresp);
1819
1820         switch (ocsp_status) {
1821         case OCSP_STATUS_OK:
1822                 RDEBUG2("ocsp: Certificate is valid");
1823                 break;
1824
1825         case OCSP_STATUS_SKIPPED:
1826         skipped:
1827                 vp = pair_make_request("TLS-OCSP-Cert-Valid", NULL, T_OP_SET);
1828                 vp->vp_integer = 2;     /* skipped */
1829                 if (conf->ocsp_softfail) {
1830                         RWDEBUG("ocsp: Unable to check certificate, assuming it's valid");
1831                         RWDEBUG("ocsp: This may be insecure");
1832
1833                         /* Remove OpenSSL errors from queue or handshake will fail */
1834                         while (ERR_get_error());
1835
1836                         ocsp_status = OCSP_STATUS_SKIPPED;
1837                 } else {
1838                         REDEBUG("ocsp: Unable to check certificate, failing");
1839                         ocsp_status = OCSP_STATUS_FAILED;
1840                 }
1841                 break;
1842
1843         default:
1844                 vp = pair_make_request("TLS-OCSP-Cert-Valid", NULL, T_OP_SET);
1845                 vp->vp_integer = 0;     /* no */
1846                 REDEBUG("ocsp: Certificate has been expired/revoked");
1847                 break;
1848         }
1849
1850         return ocsp_status;
1851 }
1852 #endif  /* HAVE_OPENSSL_OCSP_H */
1853
1854 /*
1855  *      For creating certificate attributes.
1856  */
1857 static char const *cert_attr_names[8][2] = {
1858         { "TLS-Client-Cert-Serial",                     "TLS-Cert-Serial" },
1859         { "TLS-Client-Cert-Expiration",                 "TLS-Cert-Expiration" },
1860         { "TLS-Client-Cert-Subject",                    "TLS-Cert-Subject" },
1861         { "TLS-Client-Cert-Issuer",                     "TLS-Cert-Issuer" },
1862         { "TLS-Client-Cert-Common-Name",                "TLS-Cert-Common-Name" },
1863         { "TLS-Client-Cert-Subject-Alt-Name-Email",     "TLS-Cert-Subject-Alt-Name-Email" },
1864         { "TLS-Client-Cert-Subject-Alt-Name-Dns",       "TLS-Cert-Subject-Alt-Name-Dns" },
1865         { "TLS-Client-Cert-Subject-Alt-Name-Upn",       "TLS-Cert-Subject-Alt-Name-Upn" }
1866 };
1867
1868 #define FR_TLS_SERIAL           (0)
1869 #define FR_TLS_EXPIRATION       (1)
1870 #define FR_TLS_SUBJECT          (2)
1871 #define FR_TLS_ISSUER           (3)
1872 #define FR_TLS_CN               (4)
1873 #define FR_TLS_SAN_EMAIL        (5)
1874 #define FR_TLS_SAN_DNS          (6)
1875 #define FR_TLS_SAN_UPN          (7)
1876
1877 /*
1878  *      Before trusting a certificate, you must make sure that the
1879  *      certificate is 'valid'. There are several steps that your
1880  *      application can take in determining if a certificate is
1881  *      valid. Commonly used steps are:
1882  *
1883  *      1.Verifying the certificate's signature, and verifying that
1884  *      the certificate has been issued by a trusted Certificate
1885  *      Authority.
1886  *
1887  *      2.Verifying that the certificate is valid for the present date
1888  *      (i.e. it is being presented within its validity dates).
1889  *
1890  *      3.Verifying that the certificate has not been revoked by its
1891  *      issuing Certificate Authority, by checking with respect to a
1892  *      Certificate Revocation List (CRL).
1893  *
1894  *      4.Verifying that the credentials presented by the certificate
1895  *      fulfill additional requirements specific to the application,
1896  *      such as with respect to access control lists or with respect
1897  *      to OCSP (Online Certificate Status Processing).
1898  *
1899  *      NOTE: This callback will be called multiple times based on the
1900  *      depth of the root certificate chain
1901  */
1902 int cbtls_verify(int ok, X509_STORE_CTX *ctx)
1903 {
1904         char            subject[1024]; /* Used for the subject name */
1905         char            issuer[1024]; /* Used for the issuer name */
1906         char            attribute[1024];
1907         char            value[1024];
1908         char            common_name[1024];
1909         char            cn_str[1024];
1910         char            buf[64];
1911         X509            *client_cert;
1912         X509_CINF       *client_inf;
1913         STACK_OF(X509_EXTENSION) *ext_list;
1914         SSL             *ssl;
1915         int             err, depth, lookup, loc;
1916         fr_tls_server_conf_t *conf;
1917         int             my_ok = ok;
1918
1919         ASN1_INTEGER    *sn = NULL;
1920         ASN1_TIME       *asn_time = NULL;
1921         VALUE_PAIR      **certs;
1922         char **identity;
1923 #ifdef HAVE_OPENSSL_OCSP_H
1924         X509_STORE      *ocsp_store = NULL;
1925         X509            *issuer_cert;
1926         bool            do_verify = false;
1927 #endif
1928         VALUE_PAIR      *vp;
1929         TALLOC_CTX      *talloc_ctx;
1930
1931         REQUEST         *request;
1932
1933         client_cert = X509_STORE_CTX_get_current_cert(ctx);
1934         err = X509_STORE_CTX_get_error(ctx);
1935         depth = X509_STORE_CTX_get_error_depth(ctx);
1936
1937         lookup = depth;
1938
1939         /*
1940          *      Log client/issuing cert.  If there's an error, log
1941          *      issuing cert.
1942          */
1943         if ((lookup > 1) && !my_ok) lookup = 1;
1944
1945         /*
1946          * Retrieve the pointer to the SSL of the connection currently treated
1947          * and the application specific data stored into the SSL object.
1948          */
1949         ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
1950         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1951         if (!conf) return 1;
1952
1953         request = (REQUEST *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
1954         rad_assert(request != NULL);
1955         certs = (VALUE_PAIR **)SSL_get_ex_data(ssl, fr_tls_ex_index_certs);
1956
1957         identity = (char **)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_IDENTITY);
1958 #ifdef HAVE_OPENSSL_OCSP_H
1959         ocsp_store = conf->ocsp_store;
1960 #endif
1961
1962         talloc_ctx = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_TALLOC);
1963
1964         /*
1965          *      Get the Serial Number
1966          */
1967         buf[0] = '\0';
1968         sn = X509_get_serialNumber(client_cert);
1969
1970         RDEBUG2("Creating attributes from certificate OIDs");
1971         RINDENT();
1972
1973         /*
1974          *      For this next bit, we create the attributes *only* if
1975          *      we're at the client or issuing certificate, AND we
1976          *      have a user identity.  i.e. we don't create the
1977          *      attributes for RadSec connections.
1978          */
1979         if (certs && identity &&
1980             (lookup <= 1) && sn && ((size_t) sn->length < (sizeof(buf) / 2))) {
1981                 char *p = buf;
1982                 int i;
1983
1984                 for (i = 0; i < sn->length; i++) {
1985                         sprintf(p, "%02x", (unsigned int)sn->data[i]);
1986                         p += 2;
1987                 }
1988                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SERIAL][lookup], buf, T_OP_SET);
1989                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
1990         }
1991
1992
1993         /*
1994          *      Get the Expiration Date
1995          */
1996         buf[0] = '\0';
1997         asn_time = X509_get_notAfter(client_cert);
1998         if (certs && identity && (lookup <= 1) && asn_time &&
1999             (asn_time->length < (int) sizeof(buf))) {
2000                 memcpy(buf, (char*) asn_time->data, asn_time->length);
2001                 buf[asn_time->length] = '\0';
2002                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_EXPIRATION][lookup], buf, T_OP_SET);
2003                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2004         }
2005
2006         /*
2007          *      Get the Subject & Issuer
2008          */
2009         subject[0] = issuer[0] = '\0';
2010         X509_NAME_oneline(X509_get_subject_name(client_cert), subject,
2011                           sizeof(subject));
2012         subject[sizeof(subject) - 1] = '\0';
2013         if (certs && identity && (lookup <= 1) && subject[0]) {
2014                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SUBJECT][lookup], subject, T_OP_SET);
2015                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2016         }
2017
2018         X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), issuer,
2019                           sizeof(issuer));
2020         issuer[sizeof(issuer) - 1] = '\0';
2021         if (certs && identity && (lookup <= 1) && issuer[0]) {
2022                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_ISSUER][lookup], issuer, T_OP_SET);
2023                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2024         }
2025
2026         /*
2027          *      Get the Common Name, if there is a subject.
2028          */
2029         X509_NAME_get_text_by_NID(X509_get_subject_name(client_cert),
2030                                   NID_commonName, common_name, sizeof(common_name));
2031         common_name[sizeof(common_name) - 1] = '\0';
2032         if (certs && identity && (lookup <= 1) && common_name[0] && subject[0]) {
2033                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_CN][lookup], common_name, T_OP_SET);
2034                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2035         }
2036
2037         /*
2038          *      Get the RFC822 Subject Alternative Name
2039          */
2040         loc = X509_get_ext_by_NID(client_cert, NID_subject_alt_name, 0);
2041         if (certs && (lookup <= 1) && (loc >= 0)) {
2042                 X509_EXTENSION *ext = NULL;
2043                 GENERAL_NAMES *names = NULL;
2044                 int i;
2045
2046                 if ((ext = X509_get_ext(client_cert, loc)) &&
2047                     (names = X509V3_EXT_d2i(ext))) {
2048                         for (i = 0; i < sk_GENERAL_NAME_num(names); i++) {
2049                                 GENERAL_NAME *name = sk_GENERAL_NAME_value(names, i);
2050
2051                                 switch (name->type) {
2052 #ifdef GEN_EMAIL
2053                                 case GEN_EMAIL:
2054                                         vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SAN_EMAIL][lookup],
2055                                                       (char *) ASN1_STRING_data(name->d.rfc822Name), T_OP_SET);
2056                                         rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2057                                         break;
2058 #endif  /* GEN_EMAIL */
2059 #ifdef GEN_DNS
2060                                 case GEN_DNS:
2061                                         vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SAN_DNS][lookup],
2062                                                       (char *) ASN1_STRING_data(name->d.dNSName), T_OP_SET);
2063                                         rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2064                                         break;
2065 #endif  /* GEN_DNS */
2066 #ifdef GEN_OTHERNAME
2067                                 case GEN_OTHERNAME:
2068                                         /* look for a MS UPN */
2069                                         if (NID_ms_upn == OBJ_obj2nid(name->d.otherName->type_id)) {
2070                                             /* we've got a UPN - Must be ASN1-encoded UTF8 string */
2071                                             if (name->d.otherName->value->type == V_ASN1_UTF8STRING) {
2072                                                     vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SAN_UPN][lookup],
2073                                                                   (char *) ASN1_STRING_data(name->d.otherName->value->value.utf8string), T_OP_SET);
2074                                                     rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2075                                                 break;
2076                                             } else {
2077                                                 RWARN("Invalid UPN in Subject Alt Name (should be UTF-8)");
2078                                                 break;
2079                                             }
2080                                         }
2081                                         break;
2082 #endif  /* GEN_OTHERNAME */
2083                                 default:
2084                                         /* XXX TODO handle other SAN types */
2085                                         break;
2086                                 }
2087                         }
2088                 }
2089                 if (names != NULL)
2090                         sk_GENERAL_NAME_free(names);
2091         }
2092
2093         /*
2094          *      If the CRL has expired, that might still be OK.
2095          */
2096         if (!my_ok &&
2097             (conf->allow_expired_crl) &&
2098             (err == X509_V_ERR_CRL_HAS_EXPIRED)) {
2099                 my_ok = 1;
2100                 X509_STORE_CTX_set_error( ctx, 0 );
2101         }
2102
2103         if (!my_ok) {
2104                 char const *p = X509_verify_cert_error_string(err);
2105                 RERROR("SSL says error %d : %s", err, p);
2106                 REXDENT();
2107                 return my_ok;
2108         }
2109
2110         if (lookup == 0) {
2111                 client_inf = client_cert->cert_info;
2112                 ext_list = client_inf->extensions;
2113         } else {
2114                 ext_list = NULL;
2115         }
2116
2117         /*
2118          *      Grab the X509 extensions, and create attributes out of them.
2119          *      For laziness, we re-use the OpenSSL names
2120          */
2121         if (certs && (sk_X509_EXTENSION_num(ext_list) > 0)) {
2122                 int i, len;
2123                 char *p;
2124                 BIO *out;
2125
2126                 out = BIO_new(BIO_s_mem());
2127                 strlcpy(attribute, "TLS-Client-Cert-", sizeof(attribute));
2128
2129                 for (i = 0; i < sk_X509_EXTENSION_num(ext_list); i++) {
2130                         ASN1_OBJECT *obj;
2131                         X509_EXTENSION *ext;
2132
2133                         ext = sk_X509_EXTENSION_value(ext_list, i);
2134
2135                         obj = X509_EXTENSION_get_object(ext);
2136                         i2a_ASN1_OBJECT(out, obj);
2137                         len = BIO_read(out, attribute + 16 , sizeof(attribute) - 16 - 1);
2138                         if (len <= 0) continue;
2139
2140                         attribute[16 + len] = '\0';
2141
2142                         for (p = attribute + 16; *p != '\0'; p++) {
2143                                 if (*p == ' ') *p = '-';
2144                         }
2145
2146                         X509V3_EXT_print(out, ext, 0, 0);
2147                         len = BIO_read(out, value , sizeof(value) - 1);
2148                         if (len <= 0) continue;
2149
2150                         value[len] = '\0';
2151
2152                         vp = fr_pair_make(talloc_ctx, certs, attribute, value, T_OP_ADD);
2153                         if (!vp) {
2154                                 RDEBUG3("Skipping %s += '%s'.  Please check that both the "
2155                                         "attribute and value are defined in the dictionaries",
2156                                         attribute, value);
2157                         } else {
2158                                 /*
2159                                  *      rdebug_pair_list indents (so pre REXDENT())
2160                                  */
2161                                 REXDENT();
2162                                 rdebug_pair_list(L_DBG_LVL_2, request, vp, NULL);
2163                                 RINDENT();
2164                         }
2165                 }
2166
2167                 BIO_free_all(out);
2168         }
2169
2170         REXDENT();
2171
2172         switch (ctx->error) {
2173         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
2174                 RERROR("issuer=%s", issuer);
2175                 break;
2176
2177         case X509_V_ERR_CERT_NOT_YET_VALID:
2178         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
2179                 RERROR("notBefore=");
2180 #if 0
2181                 ASN1_TIME_print(bio_err, X509_get_notBefore(ctx->current_cert));
2182 #endif
2183                 break;
2184
2185         case X509_V_ERR_CERT_HAS_EXPIRED:
2186         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
2187                 RERROR("notAfter=");
2188 #if 0
2189                 ASN1_TIME_print(bio_err, X509_get_notAfter(ctx->current_cert));
2190 #endif
2191                 break;
2192         }
2193
2194         /*
2195          *      If we're at the actual client cert, apply additional
2196          *      checks.
2197          */
2198         if (depth == 0) {
2199                 /*
2200                  *      If the conf tells us to, check cert issuer
2201                  *      against the specified value and fail
2202                  *      verification if they don't match.
2203                  */
2204                 if (conf->check_cert_issuer &&
2205                     (strcmp(issuer, conf->check_cert_issuer) != 0)) {
2206                         AUTH(LOG_PREFIX ": Certificate issuer (%s) does not match specified value (%s)!",
2207                              issuer, conf->check_cert_issuer);
2208                         my_ok = 0;
2209                 }
2210
2211                 /*
2212                  *      If the conf tells us to, check the CN in the
2213                  *      cert against xlat'ed value, but only if the
2214                  *      previous checks passed.
2215                  */
2216                 if (my_ok && conf->check_cert_cn) {
2217                         if (radius_xlat(cn_str, sizeof(cn_str), request, conf->check_cert_cn, NULL, NULL) < 0) {
2218                                 /* if this fails, fail the verification */
2219                                 my_ok = 0;
2220                         } else {
2221                                 RDEBUG2("checking certificate CN (%s) with xlat'ed value (%s)", common_name, cn_str);
2222                                 if (strcmp(cn_str, common_name) != 0) {
2223                                         AUTH(LOG_PREFIX ": Certificate CN (%s) does not match specified value (%s)!",
2224                                              common_name, cn_str);
2225                                         my_ok = 0;
2226                                 }
2227                         }
2228                 } /* check_cert_cn */
2229
2230 #ifdef HAVE_OPENSSL_OCSP_H
2231                 if (my_ok) {
2232                         /*
2233                          *      No OCSP, allow external verification.
2234                          */
2235                         if (!conf->ocsp_enable) {
2236                                 do_verify = true;
2237
2238                         } else {
2239                                 RDEBUG2("Starting OCSP Request");
2240                                 if ((X509_STORE_CTX_get1_issuer(&issuer_cert, ctx, client_cert) != 1) ||
2241                                     !issuer_cert) {
2242                                         /*
2243                                          *      Allow for external verify.
2244                                          */
2245                                         RERROR("Couldn't get issuer_cert for %s", common_name);
2246                                         do_verify = true;
2247
2248                                 } else {
2249                                         /*
2250                                          *      Do the full OCSP checks.
2251                                          *
2252                                          *      If they fail, don't run the external verify.  We don't want
2253                                          *      to allow admins to force authentication success for bad
2254                                          *      certificates.
2255                                          *
2256                                          *      If the OCSP checks succeed, check whether we still want to
2257                                          *      run the external verification routine.  If it's marked as
2258                                          *      "skip verify on OK", then we don't do verify.
2259                                          */
2260                                         my_ok = ocsp_check(request, ocsp_store, issuer_cert, client_cert, conf);
2261                                         if (my_ok != OCSP_STATUS_FAILED) {
2262                                                 do_verify = !conf->verify_skip_if_ocsp_ok;
2263                                         }
2264                                 }
2265                         }
2266                 }
2267 #endif
2268
2269                 if ((my_ok != OCSP_STATUS_FAILED)
2270 #ifdef HAVE_OPENSSL_OCSP_H
2271                     && do_verify
2272 #endif
2273                         ) while (conf->verify_client_cert_cmd) {
2274                         char filename[256];
2275                         int fd;
2276                         FILE *fp;
2277
2278                         snprintf(filename, sizeof(filename), "%s/%s.client.XXXXXXXX",
2279                                  conf->verify_tmp_dir, main_config.name);
2280                         fd = mkstemp(filename);
2281                         if (fd < 0) {
2282                                 RDEBUG("Failed creating file in %s: %s",
2283                                        conf->verify_tmp_dir, fr_syserror(errno));
2284                                 break;
2285                         }
2286
2287                         fp = fdopen(fd, "w");
2288                         if (!fp) {
2289                                 close(fd);
2290                                 RDEBUG("Failed opening file %s: %s",
2291                                        filename, fr_syserror(errno));
2292                                 break;
2293                         }
2294
2295                         if (!PEM_write_X509(fp, client_cert)) {
2296                                 fclose(fp);
2297                                 RDEBUG("Failed writing certificate to file");
2298                                 goto do_unlink;
2299                         }
2300                         fclose(fp);
2301
2302                         if (!pair_make_request("TLS-Client-Cert-Filename",
2303                                              filename, T_OP_SET)) {
2304                                 RDEBUG("Failed creating TLS-Client-Cert-Filename");
2305
2306                                 goto do_unlink;
2307                         }
2308
2309                         RDEBUG("Verifying client certificate: %s", conf->verify_client_cert_cmd);
2310                         if (radius_exec_program(request, NULL, 0, NULL, request, conf->verify_client_cert_cmd,
2311                                                 request->packet->vps,
2312                                                 true, true, EXEC_TIMEOUT) != 0) {
2313                                 AUTH(LOG_PREFIX ": Certificate CN (%s) fails external verification!", common_name);
2314                                 my_ok = 0;
2315                         } else {
2316                                 RDEBUG("Client certificate CN %s passed external validation", common_name);
2317                         }
2318
2319                 do_unlink:
2320                         unlink(filename);
2321                         break;
2322                 }
2323         } /* depth == 0 */
2324
2325         if (certs && request && !my_ok) {
2326                 fr_pair_add(&request->packet->vps, fr_pair_list_copy(request->packet, *certs));
2327         }
2328
2329         if (RDEBUG_ENABLED3) {
2330                 RDEBUG3("chain-depth   : %d", depth);
2331                 RDEBUG3("error         : %d", err);
2332
2333                 if (identity) RDEBUG3("identity      : %s", *identity);
2334                 RDEBUG3("common name   : %s", common_name);
2335                 RDEBUG3("subject       : %s", subject);
2336                 RDEBUG3("issuer        : %s", issuer);
2337                 RDEBUG3("verify return : %d", my_ok);
2338         }
2339
2340         return (my_ok != 0);
2341 }
2342
2343
2344 #ifdef HAVE_OPENSSL_OCSP_H
2345 /*
2346  *      Create Global X509 revocation store and use it to verify
2347  *      OCSP responses
2348  *
2349  *      - Load the trusted CAs
2350  *      - Load the trusted issuer certificates
2351  */
2352 static X509_STORE *init_revocation_store(fr_tls_server_conf_t *conf)
2353 {
2354         X509_STORE *store = NULL;
2355
2356         store = X509_STORE_new();
2357
2358         /* Load the CAs we trust */
2359         if (conf->ca_file || conf->ca_path)
2360                 if (!X509_STORE_load_locations(store, conf->ca_file, conf->ca_path)) {
2361                         tls_error_log(NULL, "Error reading Trusted root CA list \"%s\"", conf->ca_file);
2362                         return NULL;
2363                 }
2364
2365 #ifdef X509_V_FLAG_CRL_CHECK
2366         if (conf->check_crl)
2367                 X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK);
2368 #endif
2369 #ifdef X509_V_FLAG_CRL_CHECK_ALL
2370         if (conf->check_all_crl)
2371                 X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK_ALL);
2372 #endif
2373         return store;
2374 }
2375 #endif  /* HAVE_OPENSSL_OCSP_H */
2376
2377 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
2378 #ifndef OPENSSL_NO_ECDH
2379 static int set_ecdh_curve(SSL_CTX *ctx, char const *ecdh_curve, bool disable_single_dh_use)
2380 {
2381         int      nid;
2382         EC_KEY  *ecdh;
2383
2384         if (!ecdh_curve || !*ecdh_curve) return 0;
2385
2386         nid = OBJ_sn2nid(ecdh_curve);
2387         if (!nid) {
2388                 ERROR(LOG_PREFIX ": Unknown ecdh_curve \"%s\"", ecdh_curve);
2389                 return -1;
2390         }
2391
2392         ecdh = EC_KEY_new_by_curve_name(nid);
2393         if (!ecdh) {
2394                 ERROR(LOG_PREFIX ": Unable to create new curve \"%s\"", ecdh_curve);
2395                 return -1;
2396         }
2397
2398         SSL_CTX_set_tmp_ecdh(ctx, ecdh);
2399
2400         if (!disable_single_dh_use) {
2401                 SSL_CTX_set_options(ctx, SSL_OP_SINGLE_ECDH_USE);
2402         }
2403
2404         EC_KEY_free(ecdh);
2405
2406         return 0;
2407 }
2408 #endif
2409 #endif
2410
2411 /*
2412  * DIE OPENSSL DIE DIE DIE
2413  *
2414  * What a palaver, just to free some data attached the
2415  * session. We need to do this because the "remove" callback
2416  * is called when refcount > 0 sometimes, if another thread
2417  * is using the session
2418  */
2419 static void sess_free_vps(UNUSED void *parent, void *data_ptr,
2420                                 UNUSED CRYPTO_EX_DATA *ad, UNUSED int idx,
2421                                 UNUSED long argl, UNUSED void *argp)
2422 {
2423         VALUE_PAIR *vp = data_ptr;
2424         if (!vp) return;
2425
2426         DEBUG2(LOG_PREFIX ": Freeing cached session VPs");
2427
2428         fr_pair_list_free(&vp);
2429 }
2430
2431 static void sess_free_certs(UNUSED void *parent, void *data_ptr,
2432                                 UNUSED CRYPTO_EX_DATA *ad, UNUSED int idx,
2433                                 UNUSED long argl, UNUSED void *argp)
2434 {
2435         VALUE_PAIR **certs = data_ptr;
2436         if (!certs) return;
2437
2438         DEBUG2(LOG_PREFIX ": Freeing cached session Certificates");
2439
2440         fr_pair_list_free(certs);
2441 }
2442
2443 /** Add all the default ciphers and message digests reate our context.
2444  *
2445  * This should be called exactly once from main, before reading the main config
2446  * or initialising any modules.
2447  */
2448 void tls_global_init(void)
2449 {
2450         SSL_load_error_strings();       /* readable error messages (examples show call before library_init) */
2451         SSL_library_init();             /* initialize library */
2452         OpenSSL_add_all_algorithms();   /* required for SHA2 in OpenSSL < 0.9.8o and 1.0.0.a */
2453         OPENSSL_config(NULL);
2454
2455         /*
2456          *      Initialize the index for the certificates.
2457          */
2458         fr_tls_ex_index_certs = SSL_SESSION_get_ex_new_index(0, NULL, NULL, NULL, sess_free_certs);
2459 }
2460
2461 #ifdef ENABLE_OPENSSL_VERSION_CHECK
2462 /** Check for vulnerable versions of libssl
2463  *
2464  * @param acknowledged The highest CVE number a user has confirmed is not present in the system's libssl.
2465  * @return 0 if the CVE specified by the user matches the most recent CVE we have, else -1.
2466  */
2467 int tls_global_version_check(char const *acknowledged)
2468 {
2469         uint64_t v;
2470         bool bad = false;
2471         size_t i;
2472
2473         return 0; /* Painless Security customization */
2474
2475         if (strcmp(acknowledged, "yes") == 0) return 0;
2476
2477         /* Check for bad versions */
2478         v = (uint64_t) SSLeay();
2479
2480         for (i = 0; i < (sizeof(libssl_defects) / sizeof(*libssl_defects)); i++) {
2481                 libssl_defect_t *defect = &libssl_defects[i];
2482
2483                 if ((v >= defect->low) && (v <= defect->high)) {
2484                         /*
2485                          *      If the CVE is acknowledged, allow it.
2486                          */
2487                         if (!bad && (strcmp(acknowledged, defect->id) == 0)) return 0;
2488
2489                         ERROR("Refusing to start with libssl version %s (in range %s)",
2490                               ssl_version(), ssl_version_range(defect->low, defect->high));
2491                         ERROR("Security advisory %s (%s)", defect->id, defect->name);
2492                         ERROR("%s", defect->comment);
2493
2494                         /*
2495                          *      Only warn about the first one...
2496                          */
2497                         if (!bad) {
2498                                 INFO("Once you have verified libssl has been correctly patched, "
2499                                      "set security.allow_vulnerable_openssl = '%s'", defect->id);
2500
2501                                 bad = true;
2502                         }
2503                 }
2504         }
2505
2506         if (bad) return -1;
2507
2508         return 0;
2509 }
2510 #endif
2511
2512 /** Free any memory alloced by libssl
2513  *
2514  */
2515 void tls_global_cleanup(void)
2516 {
2517         ERR_remove_state(0);
2518         ENGINE_cleanup();
2519         CONF_modules_unload(1);
2520         ERR_free_strings();
2521         EVP_cleanup();
2522         CRYPTO_cleanup_all_ex_data();
2523 }
2524
2525 /** Create SSL context
2526  *
2527  * - Load the trusted CAs
2528  * - Load the Private key & the certificate
2529  * - Set the Context options & Verify options
2530  */
2531 SSL_CTX *tls_init_ctx(fr_tls_server_conf_t *conf, int client)
2532 {
2533         SSL_CTX         *ctx;
2534         X509_STORE      *certstore;
2535         int             verify_mode = SSL_VERIFY_NONE;
2536         int             ctx_options = 0;
2537         int             ctx_tls_versions = 0;
2538         int             type;
2539
2540         /*
2541          *      SHA256 is in all versions of OpenSSL, but isn't
2542          *      initialized by default.  It's needed for WiMAX
2543          *      certificates.
2544          */
2545 #ifdef HAVE_OPENSSL_EVP_SHA256
2546         EVP_add_digest(EVP_sha256());
2547 #endif
2548
2549         ctx = SSL_CTX_new(SSLv23_method()); /* which is really "all known SSL / TLS methods".  Idiots. */
2550         if (!ctx) {
2551                 tls_error_log(NULL, "Failed creating TLS context");
2552                 return NULL;
2553         }
2554
2555         /*
2556          * Save the config on the context so that callbacks which
2557          * only get SSL_CTX* e.g. session persistence, can get it
2558          */
2559         SSL_CTX_set_app_data(ctx, conf);
2560
2561         /*
2562          * Identify the type of certificates that needs to be loaded
2563          */
2564         if (conf->file_type) {
2565                 type = SSL_FILETYPE_PEM;
2566         } else {
2567                 type = SSL_FILETYPE_ASN1;
2568         }
2569
2570         /*
2571          * Set the password to load private key
2572          */
2573         if (conf->private_key_password) {
2574 #ifdef __APPLE__
2575                 /*
2576                  * We don't want to put the private key password in eap.conf, so  check
2577                  * for our special string which indicates we should get the password
2578                  * programmatically.
2579                  */
2580                 char const* special_string = "Apple:UseCertAdmin";
2581                 if (strncmp(conf->private_key_password, special_string, strlen(special_string)) == 0) {
2582                         char cmd[256];
2583                         char *password;
2584                         long const max_password_len = 128;
2585                         snprintf(cmd, sizeof(cmd) - 1, "/usr/sbin/certadmin --get-private-key-passphrase \"%s\"",
2586                                  conf->private_key_file);
2587
2588                         DEBUG2(LOG_PREFIX ":  Getting private key passphrase using command \"%s\"", cmd);
2589
2590                         FILE* cmd_pipe = popen(cmd, "r");
2591                         if (!cmd_pipe) {
2592                                 ERROR(LOG_PREFIX ": %s command failed: Unable to get private_key_password", cmd);
2593                                 ERROR(LOG_PREFIX ": Error reading private_key_file %s", conf->private_key_file);
2594                                 return NULL;
2595                         }
2596
2597                         rad_const_free(conf->private_key_password);
2598                         password = talloc_array(conf, char, max_password_len);
2599                         if (!password) {
2600                                 ERROR(LOG_PREFIX ": Can't allocate space for private_key_password");
2601                                 ERROR(LOG_PREFIX ": Error reading private_key_file %s", conf->private_key_file);
2602                                 pclose(cmd_pipe);
2603                                 return NULL;
2604                         }
2605
2606                         fgets(password, max_password_len, cmd_pipe);
2607                         pclose(cmd_pipe);
2608
2609                         /* Get rid of newline at end of password. */
2610                         password[strlen(password) - 1] = '\0';
2611
2612                         DEBUG3(LOG_PREFIX ": Password from command = \"%s\"", password);
2613                         conf->private_key_password = password;
2614                 }
2615 #endif
2616
2617                 {
2618                         char *password;
2619
2620                         memcpy(&password, &conf->private_key_password, sizeof(password));
2621                         SSL_CTX_set_default_passwd_cb_userdata(ctx, password);
2622                         SSL_CTX_set_default_passwd_cb(ctx, cbtls_password);
2623                 }
2624         }
2625
2626 #ifdef PSK_MAX_IDENTITY_LEN
2627         if (!client) {
2628                 /*
2629                  *      No dynamic query exists.  There MUST be a
2630                  *      statically configured identity and password.
2631                  */
2632                 if (conf->psk_query && !*conf->psk_query) {
2633                         ERROR(LOG_PREFIX ": Invalid PSK Configuration: psk_query cannot be empty");
2634                         return NULL;
2635                 }
2636
2637                 /*
2638                  *      Set the callback only if we can check things.
2639                  */
2640                 if (conf->psk_identity || conf->psk_query) {
2641                         SSL_CTX_set_psk_server_callback(ctx, psk_server_callback);
2642                 }
2643
2644         } else if (conf->psk_query) {
2645                 ERROR(LOG_PREFIX ": Invalid PSK Configuration: psk_query cannot be used for outgoing connections");
2646                 return NULL;
2647         }
2648
2649         /*
2650          *      Now check that if PSK is being used, the config is valid.
2651          */
2652         if ((conf->psk_identity && !conf->psk_password) ||
2653             (!conf->psk_identity && conf->psk_password) ||
2654             (conf->psk_identity && !*conf->psk_identity) ||
2655             (conf->psk_password && !*conf->psk_password)) {
2656                 ERROR(LOG_PREFIX ": Invalid PSK Configuration: psk_identity or psk_password are empty");
2657                 return NULL;
2658         }
2659
2660         if (conf->psk_identity) {
2661                 size_t psk_len, hex_len;
2662                 uint8_t buffer[PSK_MAX_PSK_LEN];
2663
2664                 if (conf->certificate_file ||
2665                     conf->private_key_password || conf->private_key_file ||
2666                     conf->ca_file || conf->ca_path) {
2667                         ERROR(LOG_PREFIX ": When PSKs are used, No certificate configuration is permitted");
2668                         return NULL;
2669                 }
2670
2671                 if (client) {
2672                         SSL_CTX_set_psk_client_callback(ctx,
2673                                                         psk_client_callback);
2674                 }
2675
2676                 psk_len = strlen(conf->psk_password);
2677                 if (strlen(conf->psk_password) > (2 * PSK_MAX_PSK_LEN)) {
2678                         ERROR(LOG_PREFIX ": psk_hexphrase is too long (max %d)", PSK_MAX_PSK_LEN);
2679                         return NULL;
2680                 }
2681
2682                 /*
2683                  *      Check the password now, so that we don't have
2684                  *      errors at run-time.
2685                  */
2686                 hex_len = fr_hex2bin(buffer, sizeof(buffer), conf->psk_password, psk_len);
2687                 if (psk_len != (2 * hex_len)) {
2688                         ERROR(LOG_PREFIX ": psk_hexphrase is not all hex");
2689                         return NULL;
2690                 }
2691
2692                 goto post_ca;
2693         }
2694 #else
2695         (void) client;  /* -Wunused */
2696 #endif
2697
2698         /*
2699          *      Load our keys and certificates
2700          *
2701          *      If certificates are of type PEM then we can make use
2702          *      of cert chain authentication using openssl api call
2703          *      SSL_CTX_use_certificate_chain_file.  Please see how
2704          *      the cert chain needs to be given in PEM from
2705          *      openSSL.org
2706          */
2707         if (!conf->certificate_file) goto load_ca;
2708
2709         if (type == SSL_FILETYPE_PEM) {
2710                 if (!(SSL_CTX_use_certificate_chain_file(ctx, conf->certificate_file))) {
2711                         tls_error_log(NULL, "Failed reading certificate file \"%s\"",
2712                                       conf->certificate_file);
2713                         return NULL;
2714                 }
2715
2716         } else if (!(SSL_CTX_use_certificate_file(ctx, conf->certificate_file, type))) {
2717                 tls_error_log(NULL, "Failed reading certificate file \"%s\"",
2718                               conf->certificate_file);
2719                 return NULL;
2720         }
2721
2722         /* Load the CAs we trust */
2723 load_ca:
2724         if (conf->ca_file || conf->ca_path) {
2725                 if (!SSL_CTX_load_verify_locations(ctx, conf->ca_file, conf->ca_path)) {
2726                         tls_error_log(NULL, "Failed reading Trusted root CA list \"%s\"",
2727                                       conf->ca_file);
2728                         return NULL;
2729                 }
2730         }
2731         if (conf->ca_file && *conf->ca_file) SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(conf->ca_file));
2732
2733         if (conf->private_key_file) {
2734                 if (!(SSL_CTX_use_PrivateKey_file(ctx, conf->private_key_file, type))) {
2735                         tls_error_log(NULL, "Failed reading private key file \"%s\"",
2736                                       conf->private_key_file);
2737                         return NULL;
2738                 }
2739
2740                 /*
2741                  * Check if the loaded private key is the right one
2742                  */
2743                 if (!SSL_CTX_check_private_key(ctx)) {
2744                         ERROR(LOG_PREFIX ": Private key does not match the certificate public key");
2745                         return NULL;
2746                 }
2747         }
2748
2749 #ifdef PSK_MAX_IDENTITY_LEN
2750 post_ca:
2751 #endif
2752
2753         /*
2754          *      We never want SSLv2 or SSLv3.
2755          */
2756         ctx_options |= SSL_OP_NO_SSLv2;
2757         ctx_options |= SSL_OP_NO_SSLv3;
2758
2759         /*
2760          *      As of 3.0.5, we always allow TLSv1.1 and TLSv1.2.
2761          *      Though they can be *globally* disabled if necessary.x
2762          */
2763 #ifdef SSL_OP_NO_TLSv1
2764         if (conf->disable_tlsv1) ctx_options |= SSL_OP_NO_TLSv1;
2765
2766         ctx_tls_versions |= SSL_OP_NO_TLSv1;
2767 #endif
2768 #ifdef SSL_OP_NO_TLSv1_1
2769         if (conf->disable_tlsv1_1) ctx_options |= SSL_OP_NO_TLSv1_1;
2770
2771         ctx_tls_versions |= SSL_OP_NO_TLSv1_1;
2772 #endif
2773 #ifdef SSL_OP_NO_TLSv1_2
2774
2775         if (conf->disable_tlsv1_2) ctx_options |= SSL_OP_NO_TLSv1_2;
2776
2777         ctx_tls_versions |= SSL_OP_NO_TLSv1_2;
2778
2779 #endif
2780
2781         if ((ctx_options & ctx_tls_versions) == ctx_tls_versions) {
2782                 ERROR(LOG_PREFIX ": You have disabled all available TLS versions.  EAP will not work");
2783                 return NULL;
2784         }
2785
2786 #ifdef SSL_OP_NO_TICKET
2787         ctx_options |= SSL_OP_NO_TICKET;
2788 #endif
2789
2790         if (!conf->disable_single_dh_use) {
2791                 /*
2792                  *      SSL_OP_SINGLE_DH_USE must be used in order to prevent
2793                  *      small subgroup attacks and forward secrecy. Always
2794                  *      using SSL_OP_SINGLE_DH_USE has an impact on the
2795                  *      computer time needed during negotiation, but it is not
2796                  *      very large.
2797                  */
2798                 ctx_options |= SSL_OP_SINGLE_DH_USE;
2799         }
2800
2801         /*
2802          *      SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS to work around issues
2803          *      in Windows Vista client.
2804          *      http://www.openssl.org/~bodo/tls-cbc.txt
2805          *      http://www.nabble.com/(RADIATOR)-Radiator-Version-3.16-released-t2600070.html
2806          */
2807         ctx_options |= SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
2808
2809         SSL_CTX_set_options(ctx, ctx_options);
2810
2811         /*
2812          *      TODO: Set the RSA & DH
2813          *      SSL_CTX_set_tmp_rsa_callback(ctx, cbtls_rsa);
2814          *      SSL_CTX_set_tmp_dh_callback(ctx, cbtls_dh);
2815          */
2816
2817         /*
2818          *      set the message callback to identify the type of
2819          *      message.  For every new session, there can be a
2820          *      different callback argument.
2821          *
2822          *      SSL_CTX_set_msg_callback(ctx, cbtls_msg);
2823          */
2824
2825         /*
2826          *      Set eliptical curve crypto configuration.
2827          */
2828 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
2829 #ifndef OPENSSL_NO_ECDH
2830         if (set_ecdh_curve(ctx, conf->ecdh_curve, conf->disable_single_dh_use) < 0) {
2831                 return NULL;
2832         }
2833 #endif
2834 #endif
2835
2836         /*
2837          *      OpenSSL will automatically create certificate chains,
2838          *      unless we tell it to not do that.  The problem is that
2839          *      it sometimes gets the chains right from a certificate
2840          *      signature view, but wrong from the clients view.
2841          */
2842         if (!conf->auto_chain) {
2843                 SSL_CTX_set_mode(ctx, SSL_MODE_NO_AUTO_CHAIN);
2844         }
2845
2846         /* Set Info callback */
2847         SSL_CTX_set_info_callback(ctx, cbtls_info);
2848
2849         /*
2850          *      Callbacks, etc. for session resumption.
2851          */
2852         if (conf->session_cache_enable) {
2853                 /*
2854                  *      Cache sessions on disk if requested.
2855                  */
2856                 if (conf->session_cache_path) {
2857                         SSL_CTX_sess_set_new_cb(ctx, cbtls_new_session);
2858                         SSL_CTX_sess_set_get_cb(ctx, cbtls_get_session);
2859                         SSL_CTX_sess_set_remove_cb(ctx, cbtls_remove_session);
2860                 }
2861
2862                 SSL_CTX_set_quiet_shutdown(ctx, 1);
2863                 if (fr_tls_ex_index_vps < 0)
2864                         fr_tls_ex_index_vps = SSL_SESSION_get_ex_new_index(0, NULL, NULL, NULL, sess_free_vps);
2865         }
2866
2867         /*
2868          *      Check the certificates for revocation.
2869          */
2870 #ifdef X509_V_FLAG_CRL_CHECK
2871         if (conf->check_crl) {
2872                 certstore = SSL_CTX_get_cert_store(ctx);
2873                 if (certstore == NULL) {
2874                         tls_error_log(NULL, "Error reading Certificate Store");
2875                         return NULL;
2876                 }
2877                 X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK);
2878
2879 #ifdef X509_V_FLAG_CRL_CHECK_ALL
2880                 if (conf->check_all_crl)
2881                         X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK_ALL);
2882 #endif
2883         }
2884 #endif
2885
2886         /*
2887          *      Set verify modes
2888          *      Always verify the peer certificate
2889          */
2890         verify_mode |= SSL_VERIFY_PEER;
2891         verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
2892         verify_mode |= SSL_VERIFY_CLIENT_ONCE;
2893         SSL_CTX_set_verify(ctx, verify_mode, cbtls_verify);
2894
2895         if (conf->verify_depth) {
2896                 SSL_CTX_set_verify_depth(ctx, conf->verify_depth);
2897         }
2898
2899         /* Load randomness */
2900         if (conf->random_file) {
2901                 if (!(RAND_load_file(conf->random_file, 1024*10))) {
2902                         tls_error_log(NULL, "Failed loading randomness");
2903                         return NULL;
2904                 }
2905         }
2906
2907         /*
2908          * Set the cipher list if we were told to
2909          */
2910         if (conf->cipher_list) {
2911                 if (!SSL_CTX_set_cipher_list(ctx, conf->cipher_list)) {
2912                         tls_error_log(NULL, "Failed setting cipher list");
2913                         return NULL;
2914                 }
2915         }
2916
2917         /*
2918          *      Setup session caching
2919          */
2920         if (conf->session_cache_enable) {
2921                 /*
2922                  *      Create a unique context Id per EAP-TLS configuration.
2923                  */
2924                 if (conf->session_id_name) {
2925                         snprintf(conf->session_context_id, sizeof(conf->session_context_id),
2926                                  "FR eap %s", conf->session_id_name);
2927                 } else {
2928                         snprintf(conf->session_context_id, sizeof(conf->session_context_id),
2929                                  "FR eap %p", conf);
2930                 }
2931
2932                 /*
2933                  *      Cache it, and DON'T auto-clear it.
2934                  */
2935                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_SERVER | SSL_SESS_CACHE_NO_AUTO_CLEAR);
2936
2937                 SSL_CTX_set_session_id_context(ctx,
2938                                                (unsigned char *) conf->session_context_id,
2939                                                (unsigned int) strlen(conf->session_context_id));
2940
2941                 /*
2942                  *      Our timeout is in hours, this is in seconds.
2943                  */
2944                 SSL_CTX_set_timeout(ctx, conf->session_timeout * 3600);
2945
2946                 /*
2947                  *      Set the maximum number of entries in the
2948                  *      session cache.
2949                  */
2950                 SSL_CTX_sess_set_cache_size(ctx, conf->session_cache_size);
2951
2952         } else {
2953                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
2954         }
2955
2956         return ctx;
2957 }
2958
2959
2960 /*
2961  *      Free TLS client/server config
2962  *      Should not be called outside this code, as a callback is
2963  *      added to automatically free the data when the CONF_SECTION
2964  *      is freed.
2965  */
2966 static int _tls_server_conf_free(fr_tls_server_conf_t *conf)
2967 {
2968         if (conf->ctx) SSL_CTX_free(conf->ctx);
2969
2970 #ifdef HAVE_OPENSSL_OCSP_H
2971         if (conf->ocsp_store) X509_STORE_free(conf->ocsp_store);
2972         conf->ocsp_store = NULL;
2973 #endif
2974
2975 #ifndef NDEBUG
2976         memset(conf, 0, sizeof(*conf));
2977 #endif
2978         return 0;
2979 }
2980
2981 static fr_tls_server_conf_t *tls_server_conf_alloc(TALLOC_CTX *ctx)
2982 {
2983         fr_tls_server_conf_t *conf;
2984
2985         conf = talloc_zero(ctx, fr_tls_server_conf_t);
2986         if (!conf) {
2987                 ERROR(LOG_PREFIX ": Out of memory");
2988                 return NULL;
2989         }
2990
2991         talloc_set_destructor(conf, _tls_server_conf_free);
2992
2993         return conf;
2994 }
2995
2996 fr_tls_server_conf_t *tls_server_conf_parse(CONF_SECTION *cs)
2997 {
2998         fr_tls_server_conf_t *conf;
2999
3000         /*
3001          *      If cs has already been parsed there should be a cached copy
3002          *      of conf already stored, so just return that.
3003          */
3004         conf = cf_data_find(cs, "tls-conf");
3005         if (conf) {
3006                 DEBUG(LOG_PREFIX ": Using cached TLS configuration from previous invocation");
3007                 return conf;
3008         }
3009
3010         conf = tls_server_conf_alloc(cs);
3011
3012         if (cf_section_parse(cs, conf, tls_server_config) < 0) {
3013         error:
3014                 talloc_free(conf);
3015                 return NULL;
3016         }
3017
3018         /*
3019          *      Save people from their own stupidity.
3020          */
3021         if (conf->fragment_size < 100) conf->fragment_size = 100;
3022
3023         if (!conf->private_key_file) {
3024                 ERROR(LOG_PREFIX ": TLS Server requires a private key file");
3025                 goto error;
3026         }
3027
3028         if (!conf->certificate_file) {
3029                 ERROR(LOG_PREFIX ": TLS Server requires a certificate file");
3030                 goto error;
3031         }
3032
3033         /*
3034          *      Initialize TLS
3035          */
3036         conf->ctx = tls_init_ctx(conf, 0);
3037         if (conf->ctx == NULL) {
3038                 goto error;
3039         }
3040
3041 #ifdef HAVE_OPENSSL_OCSP_H
3042         /*
3043          *      Initialize OCSP Revocation Store
3044          */
3045         if (conf->ocsp_enable) {
3046                 conf->ocsp_store = init_revocation_store(conf);
3047                 if (conf->ocsp_store == NULL) goto error;
3048         }
3049 #endif /*HAVE_OPENSSL_OCSP_H*/
3050         {
3051                 char *dh_file;
3052
3053                 memcpy(&dh_file, &conf->dh_file, sizeof(dh_file));
3054                 if (load_dh_params(conf->ctx, dh_file) < 0) {
3055                         goto error;
3056                 }
3057         }
3058
3059         if (conf->verify_tmp_dir) {
3060                 if (chmod(conf->verify_tmp_dir, S_IRWXU) < 0) {
3061                         ERROR(LOG_PREFIX ": Failed changing permissions on %s: %s",
3062                               conf->verify_tmp_dir, fr_syserror(errno));
3063                         goto error;
3064                 }
3065         }
3066
3067         if (conf->verify_client_cert_cmd && !conf->verify_tmp_dir) {
3068                 ERROR(LOG_PREFIX ": You MUST set the verify directory in order to use verify_client_cmd");
3069                 goto error;
3070         }
3071
3072 #ifdef SSL_OP_NO_TLSv1_2
3073         /*
3074          *      OpenSSL 1.0.1f and 1.0.1g get the MS-MPPE keys wrong.
3075          */
3076 #if (OPENSSL_VERSION_NUMBER >= 0x10010060L) && (OPENSSL_VERSION_NUMBER < 0x10010060L)
3077         conf->disable_tlsv1_2 = true;
3078         WARN(LOG_PREFIX ": Disabling TLSv1.2 due to OpenSSL bugs");
3079 #endif
3080 #endif
3081
3082         /*
3083          *      Cache conf in cs in case we're asked to parse this again.
3084          */
3085         cf_data_add(cs, "tls-conf", conf, NULL);
3086
3087         return conf;
3088 }
3089
3090 fr_tls_server_conf_t *tls_client_conf_parse(CONF_SECTION *cs)
3091 {
3092         fr_tls_server_conf_t *conf;
3093
3094         conf = cf_data_find(cs, "tls-conf");
3095         if (conf) {
3096                 DEBUG2(LOG_PREFIX ": Using cached TLS configuration from previous invocation");
3097                 return conf;
3098         }
3099
3100         conf = tls_server_conf_alloc(cs);
3101
3102         if (cf_section_parse(cs, conf, tls_client_config) < 0) {
3103         error:
3104                 talloc_free(conf);
3105                 return NULL;
3106         }
3107
3108         /*
3109          *      Save people from their own stupidity.
3110          */
3111         if (conf->fragment_size < 100) conf->fragment_size = 100;
3112
3113         /*
3114          *      Initialize TLS
3115          */
3116         conf->ctx = tls_init_ctx(conf, 1);
3117         if (conf->ctx == NULL) {
3118                 goto error;
3119         }
3120
3121         {
3122                 char *dh_file;
3123
3124                 memcpy(&dh_file, &conf->dh_file, sizeof(dh_file));
3125                 if (load_dh_params(conf->ctx, dh_file) < 0) {
3126                         goto error;
3127                 }
3128         }
3129
3130         cf_data_add(cs, "tls-conf", conf, NULL);
3131
3132         return conf;
3133 }
3134
3135 int tls_success(tls_session_t *ssn, REQUEST *request)
3136 {
3137         VALUE_PAIR *vp, *vps = NULL;
3138         fr_tls_server_conf_t *conf;
3139         TALLOC_CTX *talloc_ctx;
3140
3141         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CONF);
3142         rad_assert(conf != NULL);
3143
3144         talloc_ctx = SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_TALLOC);
3145
3146         /*
3147          *      If there's no session resumption, delete the entry
3148          *      from the cache.  This means either it's disabled
3149          *      globally for this SSL context, OR we were told to
3150          *      disable it for this user.
3151          *
3152          *      This also means you can't turn it on just for one
3153          *      user.
3154          */
3155         if ((!ssn->allow_session_resumption) ||
3156             (((vp = fr_pair_find_by_num(request->config, PW_ALLOW_SESSION_RESUMPTION, 0, TAG_ANY)) != NULL) &&
3157              (vp->vp_integer == 0))) {
3158                 SSL_CTX_remove_session(ssn->ctx,
3159                                        ssn->ssl_session);
3160                 ssn->allow_session_resumption = false;
3161
3162                 /*
3163                  *      If we're in a resumed session and it's
3164                  *      not allowed,
3165                  */
3166                 if (SSL_session_reused(ssn->ssl)) {
3167                         RDEBUG("Forcibly stopping session resumption as it is not allowed");
3168                         return -1;
3169                 }
3170
3171         /*
3172          *      Else resumption IS allowed, so we store the
3173          *      user data in the cache.
3174          */
3175         } else if (!SSL_session_reused(ssn->ssl)) {
3176                 VALUE_PAIR **certs;
3177                 char buffer[2 * MAX_SESSION_SIZE + 1];
3178
3179                 tls_session_id(ssn->ssl_session, buffer, MAX_SESSION_SIZE);
3180
3181                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->reply->vps, PW_USER_NAME, 0, TAG_ANY);
3182                 if (vp) fr_pair_add(&vps, vp);
3183
3184                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->packet->vps, PW_STRIPPED_USER_NAME, 0, TAG_ANY);
3185                 if (vp) fr_pair_add(&vps, vp);
3186
3187                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->packet->vps, PW_STRIPPED_USER_DOMAIN, 0, TAG_ANY);
3188                 if (vp) fr_pair_add(&vps, vp);
3189
3190                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->reply->vps, PW_CHARGEABLE_USER_IDENTITY, 0, TAG_ANY);
3191                 if (vp) fr_pair_add(&vps, vp);
3192
3193                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->reply->vps, PW_CACHED_SESSION_POLICY, 0, TAG_ANY);
3194                 if (vp) fr_pair_add(&vps, vp);
3195
3196                 certs = (VALUE_PAIR **)SSL_get_ex_data(ssn->ssl, fr_tls_ex_index_certs);
3197
3198                 /*
3199                  *      Hmm... the certs should probably be session data.
3200                  */
3201                 if (certs) {
3202                         /*
3203                          *      @todo: some go into reply, others into
3204                          *      request
3205                          */
3206                         fr_pair_add(&vps, fr_pair_list_copy(talloc_ctx, *certs));
3207
3208                         /*
3209                          *      Save the certs in the packet, so that we can see them.
3210                          */
3211                         fr_pair_add(&request->packet->vps, fr_pair_list_copy(request->packet, *certs));
3212                 }
3213
3214                 if (vps) {
3215                         SSL_SESSION_set_ex_data(ssn->ssl_session, fr_tls_ex_index_vps, vps);
3216                         rdebug_pair_list(L_DBG_LVL_2, request, vps, "  caching ");
3217
3218                         if (conf->session_cache_path) {
3219                                 /* write the VPs to the cache file */
3220                                 char filename[256], buf[1024];
3221                                 FILE *vp_file;
3222
3223                                 RDEBUG2("Saving session %s in the disk cache", buffer);
3224
3225                                 snprintf(filename, sizeof(filename), "%s%c%s.vps", conf->session_cache_path,
3226                                          FR_DIR_SEP, buffer);
3227                                 vp_file = fopen(filename, "w");
3228                                 if (vp_file == NULL) {
3229                                         RWDEBUG("Could not write session VPs to persistent cache: %s",
3230                                                 fr_syserror(errno));
3231                                 } else {
3232                                         VALUE_PAIR *prev = NULL;
3233                                         vp_cursor_t cursor;
3234                                         /* generate a dummy user-style entry which is easy to read back */
3235                                         fprintf(vp_file, "# SSL cached session\n");
3236                                         fprintf(vp_file, "%s\n\t", buffer);
3237
3238                                         for (vp = fr_cursor_init(&cursor, &vps);
3239                                              vp;
3240                                              vp = fr_cursor_next(&cursor)) {
3241                                                 /*
3242                                                  *      Terminate the previous line.
3243                                                  */
3244                                                 if (prev) fprintf(vp_file, ",\n\t");
3245
3246                                                 /*
3247                                                  *      Write this one.
3248                                                  */
3249                                                 vp_prints(buf, sizeof(buf), vp);
3250                                                 fputs(buf, vp_file);
3251                                                 prev = vp;
3252                                         }
3253
3254                                         /*
3255                                          *      Terminate the final line.
3256                                          */
3257                                         fprintf(vp_file, "\n");
3258                                         fclose(vp_file);
3259                                 }
3260                         } else {
3261                                 RDEBUG("Failed to find 'persist_dir' in TLS configuration.  Session will not be cached on disk.");
3262                         }
3263                 } else {
3264                         RDEBUG2("No information to cache: session caching will be disabled for session %s", buffer);
3265                         SSL_CTX_remove_session(ssn->ctx, ssn->ssl_session);
3266                 }
3267
3268         /*
3269          *      Else the session WAS allowed.  Copy the cached reply.
3270          */
3271         } else {
3272                 char buffer[2 * MAX_SESSION_SIZE + 1];
3273
3274                 tls_session_id(ssn->ssl_session, buffer, MAX_SESSION_SIZE);
3275
3276                 /*
3277                  *      The "restore VPs from OpenSSL cache" code is
3278                  *      now in eaptls_process()
3279                  */
3280
3281                 if (conf->session_cache_path) {
3282                         /* "touch" the cached session/vp file */
3283                         char filename[256];
3284
3285                         snprintf(filename, sizeof(filename), "%s%c%s.asn1",
3286                                  conf->session_cache_path, FR_DIR_SEP, buffer);
3287                         utime(filename, NULL);
3288                         snprintf(filename, sizeof(filename), "%s%c%s.vps",
3289                                  conf->session_cache_path, FR_DIR_SEP, buffer);
3290                         utime(filename, NULL);
3291                 }
3292
3293                 /*
3294                  *      Mark the request as resumed.
3295                  */
3296                 pair_make_request("EAP-Session-Resumed", "1", T_OP_SET);
3297         }
3298
3299         return 0;
3300 }
3301
3302
3303 void tls_fail(tls_session_t *ssn)
3304 {
3305         /*
3306          *      Force the session to NOT be cached.
3307          */
3308         SSL_CTX_remove_session(ssn->ctx, ssn->ssl_session);
3309 }
3310
3311 fr_tls_status_t tls_application_data(tls_session_t *ssn, REQUEST *request)
3312
3313 {
3314         int err;
3315         VALUE_PAIR **certs;
3316
3317         /*
3318          *      Decrypt the complete record.
3319          */
3320         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data,
3321                         ssn->dirty_in.used);
3322         if (err != (int) ssn->dirty_in.used) {
3323                 record_init(&ssn->dirty_in);
3324                 RDEBUG("Failed writing %zd bytes to SSL BIO: %d", ssn->dirty_in.used, err);
3325                 return FR_TLS_FAIL;
3326         }
3327
3328         /*
3329          *      Clear the dirty buffer now that we are done with it
3330          *      and init the clean_out buffer to store decrypted data
3331          */
3332         record_init(&ssn->dirty_in);
3333         record_init(&ssn->clean_out);
3334
3335         /*
3336          *      Read (and decrypt) the tunneled data from the
3337          *      SSL session, and put it into the decrypted
3338          *      data buffer.
3339          */
3340         err = SSL_read(ssn->ssl, ssn->clean_out.data, sizeof(ssn->clean_out.data));
3341         if (err < 0) {
3342                 int code;
3343
3344                 RDEBUG("SSL_read Error");
3345
3346                 code = SSL_get_error(ssn->ssl, err);
3347                 switch (code) {
3348                 case SSL_ERROR_WANT_READ:
3349                         DEBUG("Error in fragmentation logic: SSL_WANT_READ");
3350                         return FR_TLS_MORE_FRAGMENTS;
3351
3352                 case SSL_ERROR_WANT_WRITE:
3353                         DEBUG("Error in fragmentation logic: SSL_WANT_WRITE");
3354                         break;
3355
3356                 default:
3357                         REDEBUG("Error in fragmentation logic");
3358                         tls_error_io_log(request, ssn, err,
3359                                          "Failed in " STRINGIFY(__FUNCTION__) " (SSL_read)");
3360                         break;
3361                 }
3362                 return FR_TLS_FAIL;
3363         }
3364
3365         if (err == 0) RWDEBUG("No data inside of the tunnel");
3366
3367         /*
3368          *      Passed all checks, successfully decrypted data
3369          */
3370         ssn->clean_out.used = err;
3371
3372         /*
3373          *      Add the certificates to intermediate packets, so that
3374          *      the inner tunnel policies can use them.
3375          */
3376         certs = (VALUE_PAIR **)SSL_get_ex_data(ssn->ssl, fr_tls_ex_index_certs);
3377
3378         if (certs) fr_pair_add(&request->packet->vps, fr_pair_list_copy(request->packet, *certs));
3379
3380         return FR_TLS_OK;
3381 }
3382
3383
3384 /*
3385  * Acknowledge received is for one of the following messages sent earlier
3386  * 1. Handshake completed Message, so now send, EAP-Success
3387  * 2. Alert Message, now send, EAP-Failure
3388  * 3. Fragment Message, now send, next Fragment
3389  */
3390 fr_tls_status_t tls_ack_handler(tls_session_t *ssn, REQUEST *request)
3391 {
3392         if (ssn == NULL){
3393                 REDEBUG("Unexpected ACK received:  No ongoing SSL session");
3394                 return FR_TLS_INVALID;
3395         }
3396         if (!ssn->info.initialized) {
3397                 RDEBUG("No SSL info available.  Waiting for more SSL data");
3398                 return FR_TLS_REQUEST;
3399         }
3400
3401         if ((ssn->info.content_type == handshake) && (ssn->info.origin == 0)) {
3402                 REDEBUG("Unexpected ACK received:  We sent no previous messages");
3403                 return FR_TLS_INVALID;
3404         }
3405
3406         switch (ssn->info.content_type) {
3407         case alert:
3408                 RDEBUG2("Peer ACKed our alert");
3409                 return FR_TLS_FAIL;
3410
3411         case handshake:
3412                 if ((ssn->info.handshake_type == handshake_finished) && (ssn->dirty_out.used == 0)) {
3413                         RDEBUG2("Peer ACKed our handshake fragment.  handshake is finished");
3414
3415                         /*
3416                          *      From now on all the content is
3417                          *      application data set it here as nobody else
3418                          *      sets it.
3419                          */
3420                         ssn->info.content_type = application_data;
3421                         return FR_TLS_SUCCESS;
3422                 } /* else more data to send */
3423
3424                 RDEBUG2("Peer ACKed our handshake fragment");
3425                 /* Fragmentation handler, send next fragment */
3426                 return FR_TLS_REQUEST;
3427
3428         case application_data:
3429                 RDEBUG2("Peer ACKed our application data fragment");
3430                 return FR_TLS_REQUEST;
3431
3432                 /*
3433                  *      For the rest of the conditions, switch over
3434                  *      to the default section below.
3435                  */
3436         default:
3437                 REDEBUG("Invalid ACK received: %d", ssn->info.content_type);
3438                 return FR_TLS_INVALID;
3439         }
3440 }
3441 #endif  /* WITH_TLS */
3442