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
 553 /** Create a new TLS session
 554  *
 555  * Configures a new TLS session, configuring options, setting callbacks etc...
 556  *
 557  * @param ctx to alloc session data in. Should usually be NULL unless the lifetime of the
 558  *      session is tied to another talloc'd object.
 559  * @param conf to use to configure the tls session.
 560  * @param request The current #REQUEST.
 561  * @param client_cert Whether to require a client_cert.
 562  * @return a new session on success, or NULL on error.
 563  */
 564 tls_session_t *tls_new_session(TALLOC_CTX *ctx, fr_tls_server_conf_t *conf, REQUEST *request, bool client_cert)
 565 {
 566         tls_session_t   *state = NULL;
 567         SSL             *new_tls = NULL;
 568         int             verify_mode = 0;
 569         VALUE_PAIR      *vp;
 570
 571         rad_assert(request != NULL);
 572
 573         RDEBUG2("Initiating new EAP-TLS session");
 574
 575         /*
 576          *      Manually flush the sessions every so often.  If HALF
 577          *      of the session lifetime has passed since we last
 578          *      flushed, then flush it again.
 579          *
 580          *      FIXME: Also do it every N sessions?
 581          */
 582         if (conf->session_cache_enable &&
 583             ((conf->session_last_flushed + ((int)conf->session_timeout * 1800)) <= request->timestamp)){
 584                 RDEBUG2("Flushing SSL sessions (of #%ld)", SSL_CTX_sess_number(conf->ctx));
 585
 586                 SSL_CTX_flush_sessions(conf->ctx, request->timestamp);
 587                 conf->session_last_flushed = request->timestamp;
 588         }
 589
 590         new_tls = SSL_new(conf->ctx);
 591         if (new_tls == NULL) {
 592                 tls_error_log(request, "Error creating new TLS session");
 593                 return NULL;
 594         }
 595
 596         /* We use the SSL's "app_data" to indicate a call-back */
 597         SSL_set_app_data(new_tls, NULL);
 598
 599         if ((state = talloc_zero(ctx, tls_session_t)) == NULL) {
 600                 RERROR("Error allocating memory for SSL state");
 601                 return NULL;
 602         }
 603         session_init(state);
 604         talloc_set_destructor(state, _tls_session_free);
 605
 606         state->ctx = conf->ctx;
 607         state->ssl = new_tls;
 608
 609         /*
 610          *      Initialize callbacks
 611          */
 612         state->record_init = record_init;
 613         state->record_close = record_close;
 614         state->record_plus = record_plus;
 615         state->record_minus = record_minus;
 616
 617         /*
 618          *      Create & hook the BIOs to handle the dirty side of the
 619          *      SSL.  This is *very important* as we want to handle
 620          *      the transmission part.  Now the only IO interface
 621          *      that SSL is aware of, is our defined BIO buffers.
 622          *
 623          *      This means that all SSL IO is done to/from memory,
 624          *      and we can update those BIOs from the packets we've
 625          *      received.
 626          */
 627         state->into_ssl = BIO_new(BIO_s_mem());
 628         state->from_ssl = BIO_new(BIO_s_mem());
 629         SSL_set_bio(state->ssl, state->into_ssl, state->from_ssl);
 630
 631         /*
 632          *      Add the message callback to identify what type of
 633          *      message/handshake is passed
 634          */
 635         SSL_set_msg_callback(new_tls, cbtls_msg);
 636         SSL_set_msg_callback_arg(new_tls, state);
 637         SSL_set_info_callback(new_tls, cbtls_info);
 638
 639         /*
 640          *      In Server mode we only accept.
 641          */
 642         SSL_set_accept_state(state->ssl);
 643
 644         /*
 645          *      Verify the peer certificate, if asked.
 646          */
 647         if (client_cert) {
 648                 RDEBUG2("Setting verify mode to require certificate from client");
 649                 verify_mode = SSL_VERIFY_PEER;
 650                 verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
 651                 verify_mode |= SSL_VERIFY_CLIENT_ONCE;
 652         }
 653         SSL_set_verify(state->ssl, verify_mode, cbtls_verify);
 654
 655         SSL_set_ex_data(state->ssl, FR_TLS_EX_INDEX_CONF, (void *)conf);
 656         SSL_set_ex_data(state->ssl, FR_TLS_EX_INDEX_SSN, (void *)state);
 657         state->length_flag = conf->include_length;
 658
 659         /*
 660          *      We use default fragment size, unless the Framed-MTU
 661          *      tells us it's too big.  Note that we do NOT account
 662          *      for the EAP-TLS headers if conf->fragment_size is
 663          *      large, because that config item looks to be confusing.
 664          *
 665          *      i.e. it should REALLY be called MTU, and the code here
 666          *      should figure out what that means for TLS fragment size.
 667          *      asking the administrator to know the internal details
 668          *      of EAP-TLS in order to calculate fragment sizes is
 669          *      just too much.
 670          */
 671         state->mtu = conf->fragment_size;
 672         vp = fr_pair_find_by_num(request->packet->vps, PW_FRAMED_MTU, 0, TAG_ANY);
 673         if (vp && (vp->vp_integer > 100) && (vp->vp_integer < state->mtu)) {
 674                 state->mtu = vp->vp_integer;
 675         }
 676
 677         if (conf->session_cache_enable) state->allow_session_resumption = true; /* otherwise it's false */
 678
 679         return state;
 680 }
 681
 682 /*
 683  * We are the server, we always get the dirty data
 684  * (Handshake data is also considered as dirty data)
 685  * During handshake, since SSL API handles itself,
 686  * After clean-up, dirty_out will be filled with
 687  * the data required for handshaking. So we check
 688  * if dirty_out is empty then we simply send it back.
 689  * As of now, if handshake is successful, then we keep going,
 690  * otherwise we fail.
 691  *
 692  * Fill the Bio with the dirty data to clean it
 693  * Get the cleaned data from SSL, if it is not Handshake data
 694  */
 695 int tls_handshake_recv(REQUEST *request, tls_session_t *ssn)
 696 {
 697         int err;
 698
 699         if (ssn->invalid_hb_used) return 0;
 700
 701         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data, ssn->dirty_in.used);
 702         if (err != (int) ssn->dirty_in.used) {
 703                 REDEBUG("Failed writing %zd bytes to SSL BIO: %d", ssn->dirty_in.used, err);
 704                 record_init(&ssn->dirty_in);
 705                 return 0;
 706         }
 707         record_init(&ssn->dirty_in);
 708
 709         err = SSL_read(ssn->ssl, ssn->clean_out.data + ssn->clean_out.used,
 710                        sizeof(ssn->clean_out.data) - ssn->clean_out.used);
 711         if (err > 0) {
 712                 ssn->clean_out.used += err;
 713                 return 1;
 714         }
 715
 716         if (!tls_error_io_log(request, ssn, err, "Failed in " STRINGIFY(__FUNCTION__) " (SSL_read)")) return 0;
 717
 718         /* Some Extra STATE information for easy debugging */
 719         if (SSL_is_init_finished(ssn->ssl)) RDEBUG2("SSL Connection Established");
 720         if (SSL_in_init(ssn->ssl)) RDEBUG2("In SSL Handshake Phase");
 721         if (SSL_in_before(ssn->ssl)) RDEBUG2("Before SSL Handshake Phase");
 722         if (SSL_in_accept_init(ssn->ssl)) RDEBUG2("In SSL Accept mode");
 723         if (SSL_in_connect_init(ssn->ssl)) RDEBUG2("In SSL Connect mode");
 724
 725 #if OPENSSL_VERSION_NUMBER >= 0x10001000L
 726         /*
 727          *      Cache the SSL_SESSION pointer.
 728          */
 729         if (!ssn->ssl_session && SSL_is_init_finished(ssn->ssl)) {
 730                 ssn->ssl_session = SSL_get_session(ssn->ssl);
 731                 if (!ssn->ssl_session) {
 732                         RDEBUG("Failed getting SSL session");
 733                         return 0;
 734                 }
 735         }
 736 #endif
 737
 738         err = BIO_ctrl_pending(ssn->from_ssl);
 739         if (err > 0) {
 740                 err = BIO_read(ssn->from_ssl, ssn->dirty_out.data,
 741                                sizeof(ssn->dirty_out.data));
 742                 if (err > 0) {
 743                         ssn->dirty_out.used = err;
 744
 745                 } else if (BIO_should_retry(ssn->from_ssl)) {
 746                         record_init(&ssn->dirty_in);
 747                         RDEBUG2("Asking for more data in tunnel");
 748                         return 1;
 749
 750                 } else {
 751                         tls_error_log(NULL, NULL);
 752                         record_init(&ssn->dirty_in);
 753                         return 0;
 754                 }
 755         } else {
 756                 RDEBUG2("SSL Application Data");
 757                 /* Its clean application data, do whatever we want */
 758                 record_init(&ssn->clean_out);
 759         }
 760
 761         /* We are done with dirty_in, reinitialize it */
 762         record_init(&ssn->dirty_in);
 763         return 1;
 764 }
 765
 766 /*
 767  *      Take cleartext user data, and encrypt it into the output buffer,
 768  *      to send to the client at the other end of the SSL connection.
 769  */
 770 int tls_handshake_send(REQUEST *request, tls_session_t *ssn)
 771 {
 772         int err;
 773
 774         /*
 775          *      If there's un-encrypted data in 'clean_in', then write
 776          *      that data to the SSL session, and then call the BIO function
 777          *      to get that encrypted data from the SSL session, into
 778          *      a buffer which we can then package into an EAP packet.
 779          *
 780          *      Based on Server's logic this clean_in is expected to
 781          *      contain the data to send to the client.
 782          */
 783         if (ssn->clean_in.used > 0) {
 784                 int written;
 785
 786                 written = SSL_write(ssn->ssl, ssn->clean_in.data, ssn->clean_in.used);
 787                 record_minus(&ssn->clean_in, NULL, written);
 788
 789                 /* Get the dirty data from Bio to send it */
 790                 err = BIO_read(ssn->from_ssl, ssn->dirty_out.data,
 791                                sizeof(ssn->dirty_out.data));
 792                 if (err > 0) {
 793                         ssn->dirty_out.used = err;
 794                 } else {
 795                         if (!tls_error_io_log(request, ssn, err,
 796                                               "Failed in " STRINGIFY(__FUNCTION__) " (SSL_write)")) {
 797                                 return 0;
 798                         }
 799                 }
 800         }
 801
 802         return 1;
 803 }
 804
 805 static void session_init(tls_session_t *ssn)
 806 {
 807         ssn->ssl = NULL;
 808         ssn->into_ssl = ssn->from_ssl = NULL;
 809         record_init(&ssn->clean_in);
 810         record_init(&ssn->clean_out);
 811         record_init(&ssn->dirty_in);
 812         record_init(&ssn->dirty_out);
 813
 814         memset(&ssn->info, 0, sizeof(ssn->info));
 815
 816         ssn->mtu = 0;
 817         ssn->fragment = false;
 818         ssn->tls_msg_len = 0;
 819         ssn->length_flag = false;
 820         ssn->opaque = NULL;
 821         ssn->free_opaque = NULL;
 822 }
 823
 824 static void session_close(tls_session_t *ssn)
 825 {
 826         if (ssn->ssl) {
 827                 SSL_set_quiet_shutdown(ssn->ssl, 1);
 828                 SSL_shutdown(ssn->ssl);
 829
 830                 SSL_free(ssn->ssl);
 831                 ssn->ssl = NULL;
 832         }
 833
 834         record_close(&ssn->clean_in);
 835         record_close(&ssn->clean_out);
 836         record_close(&ssn->dirty_in);
 837         record_close(&ssn->dirty_out);
 838         session_init(ssn);
 839 }
 840
 841 static void record_init(record_t *rec)
 842 {
 843         rec->used = 0;
 844 }
 845
 846 static void record_close(record_t *rec)
 847 {
 848         rec->used = 0;
 849 }
 850
 851
 852 /*
 853  *      Copy data to the intermediate buffer, before we send
 854  *      it somewhere.
 855  */
 856 static unsigned int record_plus(record_t *rec, void const *ptr,
 857                                 unsigned int size)
 858 {
 859         unsigned int added = MAX_RECORD_SIZE - rec->used;
 860
 861         if(added > size)
 862                 added = size;
 863         if(added == 0)
 864                 return 0;
 865         memcpy(rec->data + rec->used, ptr, added);
 866         rec->used += added;
 867         return added;
 868 }
 869
 870 /*
 871  *      Take data from the buffer, and give it to the caller.
 872  */
 873 static unsigned int record_minus(record_t *rec, void *ptr,
 874                                  unsigned int size)
 875 {
 876         unsigned int taken = rec->used;
 877
 878         if(taken > size)
 879                 taken = size;
 880         if(taken == 0)
 881                 return 0;
 882         if(ptr)
 883                 memcpy(ptr, rec->data, taken);
 884         rec->used -= taken;
 885
 886         /*
 887          *      This is pretty bad...
 888          */
 889         if (rec->used > 0) memmove(rec->data, rec->data + taken, rec->used);
 890
 891         return taken;
 892 }
 893
 894 void tls_session_information(tls_session_t *tls_session)
 895 {
 896         char const *str_write_p, *str_version, *str_content_type = "";
 897         char const *str_details1 = "", *str_details2= "";
 898         REQUEST *request;
 899         char buffer[32];
 900
 901         /*
 902          *      Don't print this out in the normal course of
 903          *      operations.
 904          */
 905         if (rad_debug_lvl == 0) return;
 906
 907         str_write_p = tls_session->info.origin ? ">>> send" : "<<< recv";
 908
 909         switch (tls_session->info.version) {
 910         case SSL2_VERSION:
 911                 str_version = "SSL 2.0 ";
 912                 break;
 913         case SSL3_VERSION:
 914                 str_version = "SSL 3.0 ";
 915                 break;
 916         case TLS1_VERSION:
 917                 str_version = "TLS 1.0 ";
 918                 break;
 919 #ifdef TLS1_1_VERSION
 920         case TLS1_1_VERSION:
 921                 str_version = "TLS 1.1 ";
 922                 break;
 923 #endif
 924 #ifdef TLS1_2_VERSION
 925         case TLS1_2_VERSION:
 926                 str_version = "TLS 1.2 ";
 927                 break;
 928 #endif
 929 #ifdef TLS1_3_VERSON
 930         case TLS1_3_VERSION:
 931                 str_version = "TLS 1.3 ";
 932                 break;
 933 #endif
 934
 935         default:
 936                 sprintf(buffer, "UNKNOWN TLS VERSION ?%04X?", tls_session->info.version);
 937                 str_version = buffer;
 938                 break;
 939         }
 940
 941         if (tls_session->info.version == SSL3_VERSION ||
 942             tls_session->info.version == TLS1_VERSION) {
 943                 switch (tls_session->info.content_type) {
 944                 case SSL3_RT_CHANGE_CIPHER_SPEC:
 945                         str_content_type = "ChangeCipherSpec";
 946                         break;
 947
 948                 case SSL3_RT_ALERT:
 949                         str_content_type = "Alert";
 950                         break;
 951
 952                 case SSL3_RT_HANDSHAKE:
 953                         str_content_type = "Handshake";
 954                         break;
 955
 956                 case SSL3_RT_APPLICATION_DATA:
 957                         str_content_type = "ApplicationData";
 958                         break;
 959
 960                 default:
 961                         str_content_type = "UnknownContentType";
 962                         break;
 963                 }
 964
 965                 if (tls_session->info.content_type == SSL3_RT_ALERT) {
 966                         str_details1 = ", ???";
 967
 968                         if (tls_session->info.record_len == 2) {
 969
 970                                 switch (tls_session->info.alert_level) {
 971                                 case SSL3_AL_WARNING:
 972                                         str_details1 = ", warning";
 973                                         break;
 974                                 case SSL3_AL_FATAL:
 975                                         str_details1 = ", fatal";
 976                                         break;
 977                                 }
 978
 979                                 str_details2 = " ???";
 980                                 switch (tls_session->info.alert_description) {
 981                                 case SSL3_AD_CLOSE_NOTIFY:
 982                                         str_details2 = " close_notify";
 983                                         break;
 984
 985                                 case SSL3_AD_UNEXPECTED_MESSAGE:
 986                                         str_details2 = " unexpected_message";
 987                                         break;
 988
 989                                 case SSL3_AD_BAD_RECORD_MAC:
 990                                         str_details2 = " bad_record_mac";
 991                                         break;
 992
 993                                 case TLS1_AD_DECRYPTION_FAILED:
 994                                         str_details2 = " decryption_failed";
 995                                         break;
 996
 997                                 case TLS1_AD_RECORD_OVERFLOW:
 998                                         str_details2 = " record_overflow";
 999                                         break;
1000
1001                                 case SSL3_AD_DECOMPRESSION_FAILURE:
1002                                         str_details2 = " decompression_failure";
1003                                         break;
1004
1005                                 case SSL3_AD_HANDSHAKE_FAILURE:
1006                                         str_details2 = " handshake_failure";
1007                                         break;
1008
1009                                 case SSL3_AD_BAD_CERTIFICATE:
1010                                         str_details2 = " bad_certificate";
1011                                         break;
1012
1013                                 case SSL3_AD_UNSUPPORTED_CERTIFICATE:
1014                                         str_details2 = " unsupported_certificate";
1015                                         break;
1016
1017                                 case SSL3_AD_CERTIFICATE_REVOKED:
1018                                         str_details2 = " certificate_revoked";
1019                                         break;
1020
1021                                 case SSL3_AD_CERTIFICATE_EXPIRED:
1022                                         str_details2 = " certificate_expired";
1023                                         break;
1024
1025                                 case SSL3_AD_CERTIFICATE_UNKNOWN:
1026                                         str_details2 = " certificate_unknown";
1027                                         break;
1028
1029                                 case SSL3_AD_ILLEGAL_PARAMETER:
1030                                         str_details2 = " illegal_parameter";
1031                                         break;
1032
1033                                 case TLS1_AD_UNKNOWN_CA:
1034                                         str_details2 = " unknown_ca";
1035                                         break;
1036
1037                                 case TLS1_AD_ACCESS_DENIED:
1038                                         str_details2 = " access_denied";
1039                                         break;
1040
1041                                 case TLS1_AD_DECODE_ERROR:
1042                                         str_details2 = " decode_error";
1043                                         break;
1044
1045                                 case TLS1_AD_DECRYPT_ERROR:
1046                                         str_details2 = " decrypt_error";
1047                                         break;
1048
1049                                 case TLS1_AD_EXPORT_RESTRICTION:
1050                                         str_details2 = " export_restriction";
1051                                         break;
1052
1053                                 case TLS1_AD_PROTOCOL_VERSION:
1054                                         str_details2 = " protocol_version";
1055                                         break;
1056
1057                                 case TLS1_AD_INSUFFICIENT_SECURITY:
1058                                         str_details2 = " insufficient_security";
1059                                         break;
1060
1061                                 case TLS1_AD_INTERNAL_ERROR:
1062                                         str_details2 = " internal_error";
1063                                         break;
1064
1065                                 case TLS1_AD_USER_CANCELLED:
1066                                         str_details2 = " user_canceled";
1067                                         break;
1068
1069                                 case TLS1_AD_NO_RENEGOTIATION:
1070                                         str_details2 = " no_renegotiation";
1071                                         break;
1072                                 }
1073                         }
1074                 }
1075
1076                 if (tls_session->info.content_type == SSL3_RT_HANDSHAKE) {
1077                         str_details1 = "???";
1078
1079                         if (tls_session->info.record_len > 0) switch (tls_session->info.handshake_type) {
1080                         case SSL3_MT_HELLO_REQUEST:
1081                                 str_details1 = ", HelloRequest";
1082                                 break;
1083
1084                         case SSL3_MT_CLIENT_HELLO:
1085                                 str_details1 = ", ClientHello";
1086                                 break;
1087
1088                         case SSL3_MT_SERVER_HELLO:
1089                                 str_details1 = ", ServerHello";
1090                                 break;
1091
1092                         case SSL3_MT_CERTIFICATE:
1093                                 str_details1 = ", Certificate";
1094                                 break;
1095
1096                         case SSL3_MT_SERVER_KEY_EXCHANGE:
1097                                 str_details1 = ", ServerKeyExchange";
1098                                 break;
1099
1100                         case SSL3_MT_CERTIFICATE_REQUEST:
1101                                 str_details1 = ", CertificateRequest";
1102                                 break;
1103
1104                         case SSL3_MT_SERVER_DONE:
1105                                 str_details1 = ", ServerHelloDone";
1106                                 break;
1107
1108                         case SSL3_MT_CERTIFICATE_VERIFY:
1109                                 str_details1 = ", CertificateVerify";
1110                                 break;
1111
1112                         case SSL3_MT_CLIENT_KEY_EXCHANGE:
1113                                 str_details1 = ", ClientKeyExchange";
1114                                 break;
1115
1116                         case SSL3_MT_FINISHED:
1117                                 str_details1 = ", Finished";
1118                                 break;
1119                         }
1120                 }
1121         }
1122
1123         snprintf(tls_session->info.info_description,
1124                  sizeof(tls_session->info.info_description),
1125                  "%s %s%s [length %04lx]%s%s\n",
1126                  str_write_p, str_version, str_content_type,
1127                  (unsigned long)tls_session->info.record_len,
1128                  str_details1, str_details2);
1129
1130         request = SSL_get_ex_data(tls_session->ssl, FR_TLS_EX_INDEX_REQUEST);
1131         ROPTIONAL(RDEBUG2, DEBUG2, "%s", tls_session->info.info_description);
1132 }
1133
1134 static CONF_PARSER cache_config[] = {
1135         { "enable", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, session_cache_enable), "no" },
1136
1137         { "lifetime", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, session_timeout), "24" },
1138         { "name", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, session_id_name), NULL },
1139
1140         { "max_entries", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, session_cache_size), "255" },
1141         { "persist_dir", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, session_cache_path), NULL },
1142         CONF_PARSER_TERMINATOR
1143 };
1144
1145 static CONF_PARSER verify_config[] = {
1146         { "skip_if_ocsp_ok", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, verify_skip_if_ocsp_ok), "no" },
1147         { "tmpdir", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, verify_tmp_dir), NULL },
1148         { "client", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, verify_client_cert_cmd), NULL },
1149         CONF_PARSER_TERMINATOR
1150 };
1151
1152 #ifdef HAVE_OPENSSL_OCSP_H
1153 static CONF_PARSER ocsp_config[] = {
1154         { "enable", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_enable), "no" },
1155         { "override_cert_url", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_override_url), "no" },
1156         { "url", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, ocsp_url), NULL },
1157         { "use_nonce", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_use_nonce), "yes" },
1158         { "timeout", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, ocsp_timeout), "yes" },
1159         { "softfail", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_softfail), "no" },
1160         CONF_PARSER_TERMINATOR
1161 };
1162 #endif
1163
1164 static CONF_PARSER tls_server_config[] = {
1165         { "verify_depth", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, verify_depth), "0" },
1166         { "CA_path", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT | PW_TYPE_DEPRECATED, fr_tls_server_conf_t, ca_path), NULL },
1167         { "ca_path", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_path), NULL },
1168         { "pem_file_type", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, file_type), "yes" },
1169         { "private_key_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, private_key_file), NULL },
1170         { "certificate_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, certificate_file), NULL },
1171         { "CA_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT | PW_TYPE_DEPRECATED, fr_tls_server_conf_t, ca_file), NULL },
1172         { "ca_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_file), NULL },
1173         { "private_key_password", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_SECRET, fr_tls_server_conf_t, private_key_password), NULL },
1174 #ifdef PSK_MAX_IDENTITY_LEN
1175         { "psk_identity", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, psk_identity), NULL },
1176         { "psk_hexphrase", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_SECRET, fr_tls_server_conf_t, psk_password), NULL },
1177         { "psk_query", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, psk_query), NULL },
1178 #endif
1179         { "dh_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, dh_file), NULL },
1180         { "random_file", FR_CONF_OFFSET(PW_TYPE_FILE_EXISTS, fr_tls_server_conf_t, random_file), NULL },
1181         { "fragment_size", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, fragment_size), "1024" },
1182         { "include_length", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, include_length), "yes" },
1183         { "auto_chain", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, auto_chain), "yes" },
1184         { "disable_single_dh_use", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_single_dh_use), NULL },
1185         { "check_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, check_crl), "no" },
1186 #ifdef X509_V_FLAG_CRL_CHECK_ALL
1187         { "check_all_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, check_all_crl), "no" },
1188 #endif
1189         { "allow_expired_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, allow_expired_crl), NULL },
1190         { "check_cert_cn", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_cn), NULL },
1191         { "cipher_list", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, cipher_list), NULL },
1192         { "cipher_server_preference", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, cipher_server_preference), NULL },
1193         { "check_cert_issuer", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_issuer), NULL },
1194         { "require_client_cert", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, require_client_cert), NULL },
1195
1196 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
1197 #ifndef OPENSSL_NO_ECDH
1198         { "ecdh_curve", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, ecdh_curve), "prime256v1" },
1199 #endif
1200 #endif
1201
1202 #ifdef SSL_OP_NO_TLSv1
1203         { "disable_tlsv1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1), NULL },
1204 #endif
1205
1206 #ifdef SSL_OP_NO_TLSv1_1
1207         { "disable_tlsv1_1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_1), NULL },
1208 #endif
1209
1210 #ifdef SSL_OP_NO_TLSv1_2
1211         { "disable_tlsv1_2", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_2), NULL },
1212 #endif
1213
1214         { "cache", FR_CONF_POINTER(PW_TYPE_SUBSECTION, NULL), (void const *) cache_config },
1215
1216         { "verify", FR_CONF_POINTER(PW_TYPE_SUBSECTION, NULL), (void const *) verify_config },
1217
1218 #ifdef HAVE_OPENSSL_OCSP_H
1219         { "ocsp", FR_CONF_POINTER(PW_TYPE_SUBSECTION, NULL), (void const *) ocsp_config },
1220 #endif
1221         CONF_PARSER_TERMINATOR
1222 };
1223
1224
1225 static CONF_PARSER tls_client_config[] = {
1226         { "verify_depth", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, verify_depth), "0" },
1227         { "ca_path", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_path), NULL },
1228         { "pem_file_type", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, file_type), "yes" },
1229         { "private_key_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, private_key_file), NULL },
1230         { "certificate_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, certificate_file), NULL },
1231         { "ca_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_file), NULL },
1232         { "private_key_password", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_SECRET, fr_tls_server_conf_t, private_key_password), NULL },
1233         { "dh_file", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, dh_file), NULL },
1234         { "random_file", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, random_file), NULL },
1235         { "fragment_size", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, fragment_size), "1024" },
1236         { "include_length", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, include_length), "yes" },
1237         { "check_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, check_crl), "no" },
1238         { "check_cert_cn", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_cn), NULL },
1239         { "cipher_list", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, cipher_list), NULL },
1240         { "check_cert_issuer", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_issuer), NULL },
1241
1242 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
1243 #ifndef OPENSSL_NO_ECDH
1244         { "ecdh_curve", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, ecdh_curve), "prime256v1" },
1245 #endif
1246 #endif
1247
1248 #ifdef SSL_OP_NO_TLSv1
1249         { "disable_tlsv1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1), NULL },
1250 #endif
1251
1252 #ifdef SSL_OP_NO_TLSv1_1
1253         { "disable_tlsv1_1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_1), NULL },
1254 #endif
1255
1256 #ifdef SSL_OP_NO_TLSv1_2
1257         { "disable_tlsv1_2", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_2), NULL },
1258 #endif
1259         CONF_PARSER_TERMINATOR
1260 };
1261
1262
1263 /*
1264  *      TODO: Check for the type of key exchange * like conf->dh_key
1265  */
1266 static int load_dh_params(SSL_CTX *ctx, char *file)
1267 {
1268         DH *dh = NULL;
1269         BIO *bio;
1270
1271         if (!file) return 0;
1272
1273         if ((bio = BIO_new_file(file, "r")) == NULL) {
1274                 ERROR(LOG_PREFIX ": Unable to open DH file - %s", file);
1275                 return -1;
1276         }
1277
1278         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
1279         BIO_free(bio);
1280         if (!dh) {
1281                 WARN(LOG_PREFIX ": Unable to set DH parameters.  DH cipher suites may not work!");
1282                 WARN(LOG_PREFIX ": Fix this by running the OpenSSL command listed in eap.conf");
1283                 return 0;
1284         }
1285
1286         if (SSL_CTX_set_tmp_dh(ctx, dh) < 0) {
1287                 ERROR(LOG_PREFIX ": Unable to set DH parameters");
1288                 DH_free(dh);
1289                 return -1;
1290         }
1291
1292         DH_free(dh);
1293         return 0;
1294 }
1295
1296
1297 /*
1298  *      Print debugging messages, and free data.
1299  */
1300 static void cbtls_remove_session(SSL_CTX *ctx, SSL_SESSION *sess)
1301 {
1302         char                    buffer[2 * MAX_SESSION_SIZE + 1];
1303         fr_tls_server_conf_t    *conf;
1304
1305         tls_session_id(sess, buffer, MAX_SESSION_SIZE);
1306
1307         conf = (fr_tls_server_conf_t *)SSL_CTX_get_app_data(ctx);
1308         if (!conf) {
1309                 DEBUG(LOG_PREFIX ": Failed to find TLS configuration in session");
1310                 return;
1311         }
1312
1313         {
1314                 int rv;
1315                 char filename[256];
1316
1317                 DEBUG2(LOG_PREFIX ": Removing session %s from the cache", buffer);
1318
1319                 /* remove session and any cached VPs */
1320                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
1321                          conf->session_cache_path, FR_DIR_SEP, buffer);
1322                 rv = unlink(filename);
1323                 if (rv != 0) {
1324                         DEBUG2(LOG_PREFIX ": Could not remove persisted session file %s: %s",
1325                                filename, fr_syserror(errno));
1326                 }
1327                 /* VPs might be absent; might not have been written to disk yet */
1328                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
1329                          conf->session_cache_path, FR_DIR_SEP, buffer);
1330                 unlink(filename);
1331         }
1332
1333         return;
1334 }
1335
1336 static int cbtls_new_session(SSL *ssl, SSL_SESSION *sess)
1337 {
1338         char                    buffer[2 * MAX_SESSION_SIZE + 1];
1339         fr_tls_server_conf_t    *conf;
1340         unsigned char           *sess_blob = NULL;
1341
1342         REQUEST                 *request = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
1343
1344         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1345         if (!conf) {
1346                 RWDEBUG("Failed to find TLS configuration in session");
1347                 return 0;
1348         }
1349
1350         tls_session_id(sess, buffer, MAX_SESSION_SIZE);
1351
1352         {
1353                 int fd, rv, todo, blob_len;
1354                 char filename[256];
1355                 unsigned char *p;
1356
1357                 RDEBUG2("Serialising session %s, and storing in cache", buffer);
1358
1359                 /* find out what length data we need */
1360                 blob_len = i2d_SSL_SESSION(sess, NULL);
1361                 if (blob_len < 1) {
1362                         /* something went wrong */
1363                         if (request) RWDEBUG("Session serialisation failed, couldn't determine required buffer length");
1364                         return 0;
1365                 }
1366
1367                 /* Do not convert to TALLOC - Thread safety */
1368                 /* alloc and convert to ASN.1 */
1369                 sess_blob = malloc(blob_len);
1370                 if (!sess_blob) {
1371                         RWDEBUG("Session serialisation failed, couldn't allocate buffer (%d bytes)", blob_len);
1372                         return 0;
1373                 }
1374                 /* openssl mutates &p */
1375                 p = sess_blob;
1376                 rv = i2d_SSL_SESSION(sess, &p);
1377                 if (rv != blob_len) {
1378                         if (request) RWDEBUG("Session serialisation failed");
1379                         goto error;
1380                 }
1381
1382                 /* open output file */
1383                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
1384                          conf->session_cache_path, FR_DIR_SEP, buffer);
1385                 fd = open(filename, O_RDWR|O_CREAT|O_EXCL, S_IWUSR);
1386                 if (fd < 0) {
1387                         if (request) RERROR("Session serialisation failed, failed opening session file %s: %s",
1388                                             filename, fr_syserror(errno));
1389                         goto error;
1390                 }
1391
1392                 /*
1393                  *      Set the filename to be temporarily write-only.
1394                  */
1395                 if (request) {
1396                         VALUE_PAIR *vp;
1397
1398                         vp = fr_pair_afrom_num(request->state_ctx, PW_TLS_CACHE_FILENAME, 0);
1399                         if (vp) {
1400                                 fr_pair_value_strcpy(vp, filename);
1401                                 fr_pair_add(&request->state, vp);
1402                         }
1403                 }
1404
1405                 todo = blob_len;
1406                 p = sess_blob;
1407                 while (todo > 0) {
1408                         rv = write(fd, p, todo);
1409                         if (rv < 1) {
1410                                 if (request) RWDEBUG("Failed writing session: %s", fr_syserror(errno));
1411                                 close(fd);
1412                                 goto error;
1413                         }
1414                         p += rv;
1415                         todo -= rv;
1416                 }
1417                 close(fd);
1418                 if (request) RWDEBUG("Wrote session %s to %s (%d bytes)", buffer, filename, blob_len);
1419         }
1420
1421 error:
1422         free(sess_blob);
1423
1424         return 0;
1425 }
1426
1427 /** Convert OpenSSL's ASN1_TIME to an epoch time
1428  *
1429  * @param[out] out      Where to write the time_t.
1430  * @param[in] asn1      The ASN1_TIME to convert.
1431  * @return
1432  *      - 0 success.
1433  *      - -1 on failure.
1434  */
1435 static int ocsp_asn1time_to_epoch(time_t *out, char const *asn1)
1436 {
1437         struct          tm t;
1438         char const      *p = asn1, *end = p + strlen(p);
1439
1440         memset(&t, 0, sizeof(t));
1441
1442         if ((end - p) <= 12) {
1443                 if ((end - p) < 2) {
1444                         fr_strerror_printf("ASN1 date string too short, expected 2 additional bytes, got %zu bytes",
1445                                            end - p);
1446                         return -1;
1447                 }
1448
1449                 t.tm_year = (*(p++) - '0') * 10;
1450                 t.tm_year += (*(p++) - '0');
1451                 if (t.tm_year < 70) t.tm_year += 100;
1452         } else {
1453                 t.tm_year = (*(p++) - '0') * 1000;
1454                 t.tm_year += (*(p++) - '0') * 100;
1455                 t.tm_year += (*(p++) - '0') * 10;
1456                 t.tm_year += (*(p++) - '0');
1457                 t.tm_year -= 1900;
1458         }
1459
1460         if ((end - p) < 10) {
1461                 fr_strerror_printf("ASN1 string too short, expected 10 additional bytes, got %zu bytes",
1462                                    end - p);
1463                 return -1;
1464         }
1465
1466         t.tm_mon = (*(p++) - '0') * 10;
1467         t.tm_mon += (*(p++) - '0') - 1; // -1 since January is 0 not 1.
1468         t.tm_mday = (*(p++) - '0') * 10;
1469         t.tm_mday += (*(p++) - '0');
1470         t.tm_hour = (*(p++) - '0') * 10;
1471         t.tm_hour += (*(p++) - '0');
1472         t.tm_min = (*(p++) - '0') * 10;
1473         t.tm_min += (*(p++) - '0');
1474         t.tm_sec = (*(p++) - '0') * 10;
1475         t.tm_sec += (*(p++) - '0');
1476
1477         /* Apparently OpenSSL converts all timestamps to UTC? Maybe? */
1478         *out = timegm(&t);
1479         return 0;
1480 }
1481
1482 #if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
1483 static SSL_SESSION *cbtls_get_session(SSL *ssl, unsigned char *data, int len, int *copy)
1484 #else
1485 static SSL_SESSION *cbtls_get_session(SSL *ssl, const unsigned char *data, int len, int *copy)
1486 #endif
1487 {
1488         size_t                  size;
1489         char                    buffer[2 * MAX_SESSION_SIZE + 1];
1490         fr_tls_server_conf_t    *conf;
1491         TALLOC_CTX              *talloc_ctx;
1492
1493         SSL_SESSION             *sess = NULL;
1494         unsigned char           *sess_data = NULL;
1495         PAIR_LIST               *pairlist = NULL;
1496
1497         REQUEST                 *request = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
1498
1499         rad_assert(request != NULL);
1500
1501         size = len;
1502         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
1503
1504         fr_bin2hex(buffer, data, size);
1505
1506         RDEBUG2("Peer requested cached session: %s", buffer);
1507
1508         *copy = 0;
1509
1510         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1511         if (!conf) {
1512                 RWDEBUG("Failed to find TLS configuration in session");
1513                 return NULL;
1514         }
1515
1516         talloc_ctx = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_TALLOC);
1517
1518         {
1519                 int             rv, fd, todo;
1520                 char            filename[256];
1521
1522                 unsigned char const     **o;
1523                 unsigned char           **p;
1524                 uint8_t                 *q;
1525
1526                 struct stat     st;
1527                 VALUE_PAIR      *vps = NULL;
1528                 VALUE_PAIR      *vp;
1529
1530                 /* load the actual SSL session */
1531                 snprintf(filename, sizeof(filename), "%s%c%s.asn1", conf->session_cache_path, FR_DIR_SEP, buffer);
1532                 fd = open(filename, O_RDONLY);
1533                 if (fd < 0) {
1534                         RWDEBUG("No persisted session file %s: %s", filename, fr_syserror(errno));
1535                         goto error;
1536                 }
1537
1538                 rv = fstat(fd, &st);
1539                 if (rv < 0) {
1540                         RWDEBUG("Failed stating persisted session file %s: %s", filename, fr_syserror(errno));
1541                         close(fd);
1542                         goto error;
1543                 }
1544
1545                 sess_data = talloc_array(NULL, unsigned char, st.st_size);
1546                 if (!sess_data) {
1547                         RWDEBUG("Failed allocating buffer for persisted session (%d bytes)", (int) st.st_size);
1548                         close(fd);
1549                         goto error;
1550                 }
1551
1552                 q = sess_data;
1553                 todo = st.st_size;
1554                 while (todo > 0) {
1555                         rv = read(fd, q, todo);
1556                         if (rv < 1) {
1557                                 RWDEBUG("Failed reading persisted session: %s", fr_syserror(errno));
1558                                 close(fd);
1559                                 goto error;
1560                         }
1561                         todo -= rv;
1562                         q += rv;
1563                 }
1564                 close(fd);
1565
1566                 /*
1567                  *      OpenSSL mutates what's passed in, so we assign sess_data to q,
1568                  *      so the value of q gets mutated, and not the value of sess_data.
1569                  *
1570                  *      We then need a pointer to hold &q, but it can't be const, because
1571                  *      clang complains about lack of consting in nested pointer types.
1572                  *
1573                  *      So we memcpy the value of that pointer, to one that
1574                  *      does have a const, which we then pass into d2i_SSL_SESSION *sigh*.
1575                  */
1576                 q = sess_data;
1577                 p = &q;
1578                 memcpy(&o, &p, sizeof(o));
1579                 sess = d2i_SSL_SESSION(NULL, o, st.st_size);
1580                 if (!sess) {
1581                         RWDEBUG("Failed loading persisted session: %s", ERR_error_string(ERR_get_error(), NULL));
1582                         goto error;
1583                 }
1584
1585                 /* read in the cached VPs from the .vps file */
1586                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
1587                          conf->session_cache_path, FR_DIR_SEP, buffer);
1588                 rv = pairlist_read(talloc_ctx, filename, &pairlist, 1);
1589                 if (rv < 0) {
1590                         /* not safe to un-persist a session w/o VPs */
1591                         RWDEBUG("Failed loading persisted VPs for session %s", buffer);
1592                         SSL_SESSION_free(sess);
1593                         goto error;
1594                 }
1595
1596                 /*
1597                  *      Enforce client certificate expiration.
1598                  */
1599                 vp = fr_pair_find_by_num(pairlist->reply, PW_TLS_CLIENT_CERT_EXPIRATION, 0, TAG_ANY);
1600                 if (vp) {
1601                         time_t expires;
1602
1603                         if (ocsp_asn1time_to_epoch(&expires, vp->vp_strvalue) < 0) {
1604                                 RDEBUG2("Failed getting certificate expiration, removing cache entry for session %s", buffer);
1605                                 SSL_SESSION_free(sess);
1606                                 goto error;
1607                         }
1608
1609                         if (expires <= request->timestamp) {
1610                                 RDEBUG2("Certificate has expired, removing cache entry for session %s", buffer);
1611                                 SSL_SESSION_free(sess);
1612                                 goto error;
1613                         }
1614
1615                         /*
1616                          *      Account for Session-Timeout, if it's available.
1617                          */
1618                         vp = fr_pair_find_by_num(request->reply->vps, PW_SESSION_TIMEOUT, 0, TAG_ANY);
1619                         if (vp) {
1620                                 if ((request->timestamp + vp->vp_integer) > expires) {
1621                                         vp->vp_integer = expires - request->timestamp;
1622                                         RWDEBUG2("Updating Session-Timeout to %u, due to impending certificate expiration",
1623                                                  vp->vp_integer);
1624                                 }
1625                         }
1626                 }
1627
1628                 /* move the cached VPs into the session */
1629                 fr_pair_list_mcopy_by_num(talloc_ctx, &vps, &pairlist->reply, 0, 0, TAG_ANY);
1630
1631                 SSL_SESSION_set_ex_data(sess, fr_tls_ex_index_vps, vps);
1632                 RWDEBUG("Successfully restored session %s", buffer);
1633                 rdebug_pair_list(L_DBG_LVL_2, request, vps, "reply:");
1634         }
1635 error:
1636         if (sess_data) talloc_free(sess_data);
1637         if (pairlist) pairlist_free(&pairlist);
1638
1639         return sess;
1640 }
1641
1642 #ifdef HAVE_OPENSSL_OCSP_H
1643
1644 /** Extract components of OCSP responser URL from a certificate
1645  *
1646  * @param[in] cert to extract URL from.
1647  * @param[out] host_out Portion of the URL (must be freed with free()).
1648  * @param[out] port_out Port portion of the URL (must be freed with free()).
1649  * @param[out] path_out Path portion of the URL (must be freed with free()).
1650  * @param[out] is_https Whether the responder should be contacted using https.
1651  * @return
1652  *      - 0 if no valid URL is contained in the certificate.
1653  *      - 1 if a URL was found and parsed.
1654  *      - -1 if at least one URL was found, but none could be parsed.
1655  */
1656 static int ocsp_parse_cert_url(X509 *cert, char **host_out, char **port_out,
1657                                char **path_out, int *is_https)
1658 {
1659         int                     i;
1660         bool                    found_uri = false;
1661
1662         AUTHORITY_INFO_ACCESS   *aia;
1663         ACCESS_DESCRIPTION      *ad;
1664
1665         aia = X509_get_ext_d2i(cert, NID_info_access, NULL, NULL);
1666
1667         for (i = 0; i < sk_ACCESS_DESCRIPTION_num(aia); i++) {
1668                 ad = sk_ACCESS_DESCRIPTION_value(aia, i);
1669                 if (OBJ_obj2nid(ad->method) != NID_ad_OCSP) continue;
1670                 if (ad->location->type != GEN_URI) continue;
1671                 found_uri = true;
1672
1673                 if (OCSP_parse_url((char *) ad->location->d.ia5->data, host_out,
1674                                    port_out, path_out, is_https)) return 1;
1675         }
1676         return found_uri ? -1 : 0;
1677 }
1678
1679 /*
1680  * This function sends a OCSP request to a defined OCSP responder
1681  * and checks the OCSP response for correctness.
1682  */
1683
1684 /* Maximum leeway in validity period: default 5 minutes */
1685 #define MAX_VALIDITY_PERIOD     (5 * 60)
1686
1687 typedef enum {
1688         OCSP_STATUS_FAILED      = 0,
1689         OCSP_STATUS_OK          = 1,
1690         OCSP_STATUS_SKIPPED     = 2,
1691 } ocsp_status_t;
1692
1693 static ocsp_status_t ocsp_check(REQUEST *request, X509_STORE *store, X509 *issuer_cert, X509 *client_cert,
1694                                 fr_tls_server_conf_t *conf)
1695 {
1696         OCSP_CERTID     *certid;
1697         OCSP_REQUEST    *req;
1698         OCSP_RESPONSE   *resp = NULL;
1699         OCSP_BASICRESP  *bresp = NULL;
1700         char            *host = NULL;
1701         char            *port = NULL;
1702         char            *path = NULL;
1703         char            hostheader[1024];
1704         int             use_ssl = -1;
1705         long            nsec = MAX_VALIDITY_PERIOD, maxage = -1;
1706         BIO             *cbio, *bio_out;
1707         ocsp_status_t   ocsp_status = OCSP_STATUS_FAILED;
1708         int             status;
1709         ASN1_GENERALIZEDTIME *rev, *thisupd, *nextupd;
1710         int             reason;
1711 #if OPENSSL_VERSION_NUMBER >= 0x1000003f
1712         OCSP_REQ_CTX    *ctx;
1713         int             rc;
1714         struct timeval  now;
1715         struct timeval  when;
1716 #endif
1717         VALUE_PAIR      *vp;
1718
1719         /*
1720          * Create OCSP Request
1721          */
1722         certid = OCSP_cert_to_id(NULL, client_cert, issuer_cert);
1723         req = OCSP_REQUEST_new();
1724         OCSP_request_add0_id(req, certid);
1725         if (conf->ocsp_use_nonce) OCSP_request_add1_nonce(req, NULL, 8);
1726
1727         /*
1728          * Send OCSP Request and get OCSP Response
1729          */
1730
1731         /* Get OCSP responder URL */
1732         if (conf->ocsp_override_url) {
1733                 char *url;
1734
1735         use_ocsp_url:
1736                 memcpy(&url, &conf->ocsp_url, sizeof(url));
1737                 /* Reading the libssl src, they do a strdup on the URL, so it could of been const *sigh* */
1738                 OCSP_parse_url(url, &host, &port, &path, &use_ssl);
1739                 if (!host || !port || !path) {
1740                         RWDEBUG("ocsp: Host or port or path missing from configured URL \"%s\".  Not doing OCSP", url);
1741                         goto skipped;
1742                 }
1743         } else {
1744                 int ret;
1745
1746                 ret = ocsp_parse_cert_url(client_cert, &host, &port, &path, &use_ssl);
1747                 switch (ret) {
1748                 case -1:
1749                         RWDEBUG("ocsp: Invalid URL in certificate.  Not doing OCSP");
1750                         break;
1751
1752                 case 0:
1753                         if (conf->ocsp_url) {
1754                                 RWDEBUG("ocsp: No OCSP URL in certificate, falling back to configured URL");
1755                                 goto use_ocsp_url;
1756                         }
1757                         RWDEBUG("ocsp: No OCSP URL in certificate.  Not doing OCSP");
1758                         goto skipped;
1759
1760                 case 1:
1761                         break;
1762                 }
1763         }
1764
1765         RDEBUG2("ocsp: Using responder URL \"http://%s:%s%s\"", host, port, path);
1766
1767         /* Check host and port length are sane, then create Host: HTTP header */
1768         if ((strlen(host) + strlen(port) + 2) > sizeof(hostheader)) {
1769                 RWDEBUG("ocsp: Host and port too long");
1770                 goto skipped;
1771         }
1772         snprintf(hostheader, sizeof(hostheader), "%s:%s", host, port);
1773
1774         /* Setup BIO socket to OCSP responder */
1775         cbio = BIO_new_connect(host);
1776
1777         bio_out = NULL;
1778         if (rad_debug_lvl) {
1779                 if (default_log.dst == L_DST_STDOUT) {
1780                         bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
1781                 } else if (default_log.dst == L_DST_STDERR) {
1782                         bio_out = BIO_new_fp(stderr, BIO_NOCLOSE);
1783                 }
1784         }
1785
1786         BIO_set_conn_port(cbio, port);
1787 #if OPENSSL_VERSION_NUMBER < 0x1000003f
1788         BIO_do_connect(cbio);
1789
1790         /* Send OCSP request and wait for response */
1791         resp = OCSP_sendreq_bio(cbio, path, req);
1792         if (!resp) {
1793                 REDEBUG("ocsp: Couldn't get OCSP response");
1794                 ocsp_status = OCSP_STATUS_SKIPPED;
1795                 goto ocsp_end;
1796         }
1797 #else
1798         if (conf->ocsp_timeout)
1799                 BIO_set_nbio(cbio, 1);
1800
1801         rc = BIO_do_connect(cbio);
1802         if ((rc <= 0) && ((!conf->ocsp_timeout) || !BIO_should_retry(cbio))) {
1803                 REDEBUG("ocsp: Couldn't connect to OCSP responder");
1804                 ocsp_status = OCSP_STATUS_SKIPPED;
1805                 goto ocsp_end;
1806         }
1807
1808         ctx = OCSP_sendreq_new(cbio, path, NULL, -1);
1809         if (!ctx) {
1810                 REDEBUG("ocsp: Couldn't create OCSP request");
1811                 ocsp_status = OCSP_STATUS_SKIPPED;
1812                 goto ocsp_end;
1813         }
1814
1815         if (!OCSP_REQ_CTX_add1_header(ctx, "Host", hostheader)) {
1816                 REDEBUG("ocsp: Couldn't set Host header");
1817                 ocsp_status = OCSP_STATUS_SKIPPED;
1818                 goto ocsp_end;
1819         }
1820
1821         if (!OCSP_REQ_CTX_set1_req(ctx, req)) {
1822                 REDEBUG("ocsp: Couldn't add data to OCSP request");
1823                 ocsp_status = OCSP_STATUS_SKIPPED;
1824                 goto ocsp_end;
1825         }
1826
1827         gettimeofday(&when, NULL);
1828         when.tv_sec += conf->ocsp_timeout;
1829
1830         do {
1831                 rc = OCSP_sendreq_nbio(&resp, ctx);
1832                 if (conf->ocsp_timeout) {
1833                         gettimeofday(&now, NULL);
1834                         if (!timercmp(&now, &when, <))
1835                                 break;
1836                 }
1837         } while ((rc == -1) && BIO_should_retry(cbio));
1838
1839         if (conf->ocsp_timeout && (rc == -1) && BIO_should_retry(cbio)) {
1840                 REDEBUG("ocsp: Response timed out");
1841                 ocsp_status = OCSP_STATUS_SKIPPED;
1842                 goto ocsp_end;
1843         }
1844
1845         OCSP_REQ_CTX_free(ctx);
1846
1847         if (rc == 0) {
1848                 REDEBUG("ocsp: Couldn't get OCSP response");
1849                 ocsp_status = OCSP_STATUS_SKIPPED;
1850                 goto ocsp_end;
1851         }
1852 #endif
1853
1854         /* Verify OCSP response status */
1855         status = OCSP_response_status(resp);
1856         if (status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
1857                 REDEBUG("ocsp: Response status: %s", OCSP_response_status_str(status));
1858                 goto ocsp_end;
1859         }
1860         bresp = OCSP_response_get1_basic(resp);
1861         if (conf->ocsp_use_nonce && OCSP_check_nonce(req, bresp)!=1) {
1862                 REDEBUG("ocsp: Response has wrong nonce value");
1863                 goto ocsp_end;
1864         }
1865         if (OCSP_basic_verify(bresp, NULL, store, 0)!=1){
1866                 REDEBUG("ocsp: Couldn't verify OCSP basic response");
1867                 goto ocsp_end;
1868         }
1869
1870         /*      Verify OCSP cert status */
1871         if (!OCSP_resp_find_status(bresp, certid, &status, &reason, &rev, &thisupd, &nextupd)) {
1872                 REDEBUG("ocsp: No Status found");
1873                 goto ocsp_end;
1874         }
1875
1876         if (!OCSP_check_validity(thisupd, nextupd, nsec, maxage)) {
1877                 if (bio_out) {
1878                         BIO_puts(bio_out, "WARNING: Status times invalid.\n");
1879                         ERR_print_errors(bio_out);
1880                 }
1881                 goto ocsp_end;
1882         }
1883
1884         if (bio_out) {
1885                 BIO_puts(bio_out, "\tThis Update: ");
1886                 ASN1_GENERALIZEDTIME_print(bio_out, thisupd);
1887                 BIO_puts(bio_out, "\n");
1888                 if (nextupd) {
1889                         BIO_puts(bio_out, "\tNext Update: ");
1890                         ASN1_GENERALIZEDTIME_print(bio_out, nextupd);
1891                         BIO_puts(bio_out, "\n");
1892                 }
1893         }
1894
1895         switch (status) {
1896         case V_OCSP_CERTSTATUS_GOOD:
1897                 RDEBUG2("ocsp: Cert status: good");
1898                 vp = pair_make_request("TLS-OCSP-Cert-Valid", NULL, T_OP_SET);
1899                 vp->vp_integer = 1;     /* yes */
1900                 ocsp_status = OCSP_STATUS_OK;
1901                 break;
1902
1903         default:
1904                 /* REVOKED / UNKNOWN */
1905                 REDEBUG("ocsp: Cert status: %s", OCSP_cert_status_str(status));
1906                 if (reason != -1) REDEBUG("ocsp: Reason: %s", OCSP_crl_reason_str(reason));
1907
1908                 if (bio_out) {
1909                         BIO_puts(bio_out, "\tRevocation Time: ");
1910                         ASN1_GENERALIZEDTIME_print(bio_out, rev);
1911                         BIO_puts(bio_out, "\n");
1912                 }
1913                 break;
1914         }
1915
1916 ocsp_end:
1917         /* Free OCSP Stuff */
1918         OCSP_REQUEST_free(req);
1919         OCSP_RESPONSE_free(resp);
1920         free(host);
1921         free(port);
1922         free(path);
1923         BIO_free_all(cbio);
1924         if (bio_out) BIO_free(bio_out);
1925         OCSP_BASICRESP_free(bresp);
1926
1927         switch (ocsp_status) {
1928         case OCSP_STATUS_OK:
1929                 RDEBUG2("ocsp: Certificate is valid");
1930                 break;
1931
1932         case OCSP_STATUS_SKIPPED:
1933         skipped:
1934                 vp = pair_make_request("TLS-OCSP-Cert-Valid", NULL, T_OP_SET);
1935                 vp->vp_integer = 2;     /* skipped */
1936                 if (conf->ocsp_softfail) {
1937                         RWDEBUG("ocsp: Unable to check certificate, assuming it's valid");
1938                         RWDEBUG("ocsp: This may be insecure");
1939
1940                         /* Remove OpenSSL errors from queue or handshake will fail */
1941                         while (ERR_get_error());
1942
1943                         ocsp_status = OCSP_STATUS_SKIPPED;
1944                 } else {
1945                         REDEBUG("ocsp: Unable to check certificate, failing");
1946                         ocsp_status = OCSP_STATUS_FAILED;
1947                 }
1948                 break;
1949
1950         default:
1951                 vp = pair_make_request("TLS-OCSP-Cert-Valid", NULL, T_OP_SET);
1952                 vp->vp_integer = 0;     /* no */
1953                 REDEBUG("ocsp: Certificate has been expired/revoked");
1954                 break;
1955         }
1956
1957         return ocsp_status;
1958 }
1959 #endif  /* HAVE_OPENSSL_OCSP_H */
1960
1961 /*
1962  *      For creating certificate attributes.
1963  */
1964 static char const *cert_attr_names[8][2] = {
1965         { "TLS-Client-Cert-Serial",                     "TLS-Cert-Serial" },
1966         { "TLS-Client-Cert-Expiration",                 "TLS-Cert-Expiration" },
1967         { "TLS-Client-Cert-Subject",                    "TLS-Cert-Subject" },
1968         { "TLS-Client-Cert-Issuer",                     "TLS-Cert-Issuer" },
1969         { "TLS-Client-Cert-Common-Name",                "TLS-Cert-Common-Name" },
1970         { "TLS-Client-Cert-Subject-Alt-Name-Email",     "TLS-Cert-Subject-Alt-Name-Email" },
1971         { "TLS-Client-Cert-Subject-Alt-Name-Dns",       "TLS-Cert-Subject-Alt-Name-Dns" },
1972         { "TLS-Client-Cert-Subject-Alt-Name-Upn",       "TLS-Cert-Subject-Alt-Name-Upn" }
1973 };
1974
1975 #define FR_TLS_SERIAL           (0)
1976 #define FR_TLS_EXPIRATION       (1)
1977 #define FR_TLS_SUBJECT          (2)
1978 #define FR_TLS_ISSUER           (3)
1979 #define FR_TLS_CN               (4)
1980 #define FR_TLS_SAN_EMAIL        (5)
1981 #define FR_TLS_SAN_DNS          (6)
1982 #define FR_TLS_SAN_UPN          (7)
1983
1984 /*
1985  *      Before trusting a certificate, you must make sure that the
1986  *      certificate is 'valid'. There are several steps that your
1987  *      application can take in determining if a certificate is
1988  *      valid. Commonly used steps are:
1989  *
1990  *      1.Verifying the certificate's signature, and verifying that
1991  *      the certificate has been issued by a trusted Certificate
1992  *      Authority.
1993  *
1994  *      2.Verifying that the certificate is valid for the present date
1995  *      (i.e. it is being presented within its validity dates).
1996  *
1997  *      3.Verifying that the certificate has not been revoked by its
1998  *      issuing Certificate Authority, by checking with respect to a
1999  *      Certificate Revocation List (CRL).
2000  *
2001  *      4.Verifying that the credentials presented by the certificate
2002  *      fulfill additional requirements specific to the application,
2003  *      such as with respect to access control lists or with respect
2004  *      to OCSP (Online Certificate Status Processing).
2005  *
2006  *      NOTE: This callback will be called multiple times based on the
2007  *      depth of the root certificate chain
2008  */
2009 int cbtls_verify(int ok, X509_STORE_CTX *ctx)
2010 {
2011         char            subject[1024]; /* Used for the subject name */
2012         char            issuer[1024]; /* Used for the issuer name */
2013         char            attribute[1024];
2014         char            value[1024];
2015         char            common_name[1024];
2016         char            cn_str[1024];
2017         char            buf[64];
2018         X509            *client_cert;
2019 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
2020         const STACK_OF(X509_EXTENSION) *ext_list;
2021 #else
2022         STACK_OF(X509_EXTENSION) *ext_list;
2023 #endif
2024         SSL             *ssl;
2025         int             err, depth, lookup, loc;
2026         fr_tls_server_conf_t *conf;
2027         int             my_ok = ok;
2028
2029         ASN1_INTEGER    *sn = NULL;
2030         ASN1_TIME       *asn_time = NULL;
2031         VALUE_PAIR      **certs;
2032         char **identity;
2033 #ifdef HAVE_OPENSSL_OCSP_H
2034         X509_STORE      *ocsp_store = NULL;
2035         X509            *issuer_cert;
2036         bool            do_verify = false;
2037 #endif
2038         VALUE_PAIR      *vp;
2039         TALLOC_CTX      *talloc_ctx;
2040
2041         REQUEST         *request;
2042
2043         client_cert = X509_STORE_CTX_get_current_cert(ctx);
2044         err = X509_STORE_CTX_get_error(ctx);
2045         depth = X509_STORE_CTX_get_error_depth(ctx);
2046
2047         lookup = depth;
2048
2049         /*
2050          *      Log client/issuing cert.  If there's an error, log
2051          *      issuing cert.
2052          */
2053         if ((lookup > 1) && !my_ok) lookup = 1;
2054
2055         /*
2056          * Retrieve the pointer to the SSL of the connection currently treated
2057          * and the application specific data stored into the SSL object.
2058          */
2059         ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
2060         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
2061         if (!conf) return 1;
2062
2063         request = (REQUEST *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
2064         rad_assert(request != NULL);
2065         certs = (VALUE_PAIR **)SSL_get_ex_data(ssl, fr_tls_ex_index_certs);
2066
2067         identity = (char **)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_IDENTITY);
2068 #ifdef HAVE_OPENSSL_OCSP_H
2069         ocsp_store = conf->ocsp_store;
2070 #endif
2071
2072         talloc_ctx = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_TALLOC);
2073
2074         /*
2075          *      Get the Serial Number
2076          */
2077         buf[0] = '\0';
2078         sn = X509_get_serialNumber(client_cert);
2079
2080         RDEBUG2("Creating attributes from certificate OIDs");
2081         RINDENT();
2082
2083         /*
2084          *      For this next bit, we create the attributes *only* if
2085          *      we're at the client or issuing certificate, AND we
2086          *      have a user identity.  i.e. we don't create the
2087          *      attributes for RadSec connections.
2088          */
2089         if (certs && identity &&
2090             (lookup <= 1) && sn && ((size_t) sn->length < (sizeof(buf) / 2))) {
2091                 char *p = buf;
2092                 int i;
2093
2094                 for (i = 0; i < sn->length; i++) {
2095                         sprintf(p, "%02x", (unsigned int)sn->data[i]);
2096                         p += 2;
2097                 }
2098                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SERIAL][lookup], buf, T_OP_SET);
2099                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2100         }
2101
2102
2103         /*
2104          *      Get the Expiration Date
2105          */
2106         buf[0] = '\0';
2107         asn_time = X509_get_notAfter(client_cert);
2108         if (certs && identity && (lookup <= 1) && asn_time &&
2109             (asn_time->length < (int) sizeof(buf))) {
2110                 memcpy(buf, (char*) asn_time->data, asn_time->length);
2111                 buf[asn_time->length] = '\0';
2112                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_EXPIRATION][lookup], buf, T_OP_SET);
2113                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2114         }
2115
2116         /*
2117          *      Get the Subject & Issuer
2118          */
2119         subject[0] = issuer[0] = '\0';
2120         X509_NAME_oneline(X509_get_subject_name(client_cert), subject,
2121                           sizeof(subject));
2122         subject[sizeof(subject) - 1] = '\0';
2123         if (certs && identity && (lookup <= 1) && subject[0]) {
2124                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SUBJECT][lookup], subject, T_OP_SET);
2125                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2126         }
2127
2128         X509_NAME_oneline(X509_get_issuer_name(client_cert), issuer,
2129                           sizeof(issuer));
2130         issuer[sizeof(issuer) - 1] = '\0';
2131         if (certs && identity && (lookup <= 1) && issuer[0]) {
2132                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_ISSUER][lookup], issuer, T_OP_SET);
2133                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2134         }
2135
2136         /*
2137          *      Get the Common Name, if there is a subject.
2138          */
2139         X509_NAME_get_text_by_NID(X509_get_subject_name(client_cert),
2140                                   NID_commonName, common_name, sizeof(common_name));
2141         common_name[sizeof(common_name) - 1] = '\0';
2142         if (certs && identity && (lookup <= 1) && common_name[0] && subject[0]) {
2143                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_CN][lookup], common_name, T_OP_SET);
2144                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2145         }
2146
2147         /*
2148          *      Get the RFC822 Subject Alternative Name
2149          */
2150         loc = X509_get_ext_by_NID(client_cert, NID_subject_alt_name, -1);
2151         if (certs && (lookup <= 1) && (loc >= 0)) {
2152                 X509_EXTENSION *ext = NULL;
2153                 GENERAL_NAMES *names = NULL;
2154                 int i;
2155
2156                 if ((ext = X509_get_ext(client_cert, loc)) &&
2157                     (names = X509V3_EXT_d2i(ext))) {
2158                         for (i = 0; i < sk_GENERAL_NAME_num(names); i++) {
2159                                 GENERAL_NAME *name = sk_GENERAL_NAME_value(names, i);
2160
2161                                 switch (name->type) {
2162 #ifdef GEN_EMAIL
2163                                 case GEN_EMAIL:
2164                                         vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SAN_EMAIL][lookup],
2165                                                       (char const *) ASN1_STRING_get0_data(name->d.rfc822Name), T_OP_SET);
2166                                         rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2167                                         break;
2168 #endif  /* GEN_EMAIL */
2169 #ifdef GEN_DNS
2170                                 case GEN_DNS:
2171                                         vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SAN_DNS][lookup],
2172                                                       (char const *) ASN1_STRING_get0_data(name->d.dNSName), T_OP_SET);
2173                                         rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2174                                         break;
2175 #endif  /* GEN_DNS */
2176 #ifdef GEN_OTHERNAME
2177                                 case GEN_OTHERNAME:
2178                                         /* look for a MS UPN */
2179                                         if (NID_ms_upn == OBJ_obj2nid(name->d.otherName->type_id)) {
2180                                             /* we've got a UPN - Must be ASN1-encoded UTF8 string */
2181                                             if (name->d.otherName->value->type == V_ASN1_UTF8STRING) {
2182                                                     vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SAN_UPN][lookup],
2183                                                                   (char const *) ASN1_STRING_get0_data(name->d.otherName->value->value.utf8string), T_OP_SET);
2184                                                     rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2185                                                 break;
2186                                             } else {
2187                                                 RWARN("Invalid UPN in Subject Alt Name (should be UTF-8)");
2188                                                 break;
2189                                             }
2190                                         }
2191                                         break;
2192 #endif  /* GEN_OTHERNAME */
2193                                 default:
2194                                         /* XXX TODO handle other SAN types */
2195                                         break;
2196                                 }
2197                         }
2198                 }
2199                 if (names != NULL)
2200                         sk_GENERAL_NAME_free(names);
2201         }
2202
2203         /*
2204          *      If the CRL has expired, that might still be OK.
2205          */
2206         if (!my_ok &&
2207             (conf->allow_expired_crl) &&
2208             (err == X509_V_ERR_CRL_HAS_EXPIRED)) {
2209                 my_ok = 1;
2210                 X509_STORE_CTX_set_error( ctx, 0 );
2211         }
2212
2213         if (!my_ok) {
2214                 char const *p = X509_verify_cert_error_string(err);
2215                 RERROR("SSL says error %d : %s", err, p);
2216                 REXDENT();
2217                 return my_ok;
2218         }
2219
2220         if (lookup == 0) {
2221 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
2222                 ext_list = X509_get0_extensions(client_cert);
2223 #else
2224                 X509_CINF       *client_inf;
2225                 client_inf = client_cert->cert_info;
2226                 ext_list = client_inf->extensions;
2227 #endif
2228         } else {
2229                 ext_list = NULL;
2230         }
2231
2232         /*
2233          *      Grab the X509 extensions, and create attributes out of them.
2234          *      For laziness, we re-use the OpenSSL names
2235          */
2236         if (certs && (sk_X509_EXTENSION_num(ext_list) > 0)) {
2237                 int i, len;
2238                 char *p;
2239                 BIO *out;
2240
2241                 out = BIO_new(BIO_s_mem());
2242                 strlcpy(attribute, "TLS-Client-Cert-", sizeof(attribute));
2243
2244                 for (i = 0; i < sk_X509_EXTENSION_num(ext_list); i++) {
2245                         ASN1_OBJECT *obj;
2246                         X509_EXTENSION *ext;
2247
2248                         ext = sk_X509_EXTENSION_value(ext_list, i);
2249
2250                         obj = X509_EXTENSION_get_object(ext);
2251                         i2a_ASN1_OBJECT(out, obj);
2252                         len = BIO_read(out, attribute + 16 , sizeof(attribute) - 16 - 1);
2253                         if (len <= 0) continue;
2254
2255                         attribute[16 + len] = '\0';
2256
2257                         for (p = attribute + 16; *p != '\0'; p++) {
2258                                 if (*p == ' ') *p = '-';
2259                         }
2260
2261                         X509V3_EXT_print(out, ext, 0, 0);
2262                         len = BIO_read(out, value , sizeof(value) - 1);
2263                         if (len <= 0) continue;
2264
2265                         value[len] = '\0';
2266
2267                         vp = fr_pair_make(talloc_ctx, certs, attribute, value, T_OP_ADD);
2268                         if (!vp) {
2269                                 RDEBUG3("Skipping %s += '%s'.  Please check that both the "
2270                                         "attribute and value are defined in the dictionaries",
2271                                         attribute, value);
2272                         } else {
2273                                 /*
2274                                  *      rdebug_pair_list indents (so pre REXDENT())
2275                                  */
2276                                 REXDENT();
2277                                 rdebug_pair_list(L_DBG_LVL_2, request, vp, NULL);
2278                                 RINDENT();
2279                         }
2280                 }
2281
2282                 BIO_free_all(out);
2283         }
2284
2285         REXDENT();
2286
2287         switch (X509_STORE_CTX_get_error(ctx)) {
2288         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
2289                 RERROR("issuer=%s", issuer);
2290                 break;
2291
2292         case X509_V_ERR_CERT_NOT_YET_VALID:
2293         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
2294                 RERROR("notBefore=");
2295 #if 0
2296                 ASN1_TIME_print(bio_err, X509_get_notBefore(ctx->current_cert));
2297 #endif
2298                 break;
2299
2300         case X509_V_ERR_CERT_HAS_EXPIRED:
2301         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
2302                 RERROR("notAfter=");
2303 #if 0
2304                 ASN1_TIME_print(bio_err, X509_get_notAfter(ctx->current_cert));
2305 #endif
2306                 break;
2307         }
2308
2309         /*
2310          *      If we're at the actual client cert, apply additional
2311          *      checks.
2312          */
2313         if (depth == 0) {
2314                 /*
2315                  *      If the conf tells us to, check cert issuer
2316                  *      against the specified value and fail
2317                  *      verification if they don't match.
2318                  */
2319                 if (conf->check_cert_issuer &&
2320                     (strcmp(issuer, conf->check_cert_issuer) != 0)) {
2321                         AUTH(LOG_PREFIX ": Certificate issuer (%s) does not match specified value (%s)!",
2322                              issuer, conf->check_cert_issuer);
2323                         my_ok = 0;
2324                 }
2325
2326                 /*
2327                  *      If the conf tells us to, check the CN in the
2328                  *      cert against xlat'ed value, but only if the
2329                  *      previous checks passed.
2330                  */
2331                 if (my_ok && conf->check_cert_cn) {
2332                         if (radius_xlat(cn_str, sizeof(cn_str), request, conf->check_cert_cn, NULL, NULL) < 0) {
2333                                 /* if this fails, fail the verification */
2334                                 my_ok = 0;
2335                         } else {
2336                                 RDEBUG2("checking certificate CN (%s) with xlat'ed value (%s)", common_name, cn_str);
2337                                 if (strcmp(cn_str, common_name) != 0) {
2338                                         AUTH(LOG_PREFIX ": Certificate CN (%s) does not match specified value (%s)!",
2339                                              common_name, cn_str);
2340                                         my_ok = 0;
2341                                 }
2342                         }
2343                 } /* check_cert_cn */
2344
2345 #ifdef HAVE_OPENSSL_OCSP_H
2346                 if (my_ok) {
2347                         /*
2348                          *      No OCSP, allow external verification.
2349                          */
2350                         if (!conf->ocsp_enable) {
2351                                 do_verify = true;
2352
2353                         } else {
2354                                 RDEBUG2("Starting OCSP Request");
2355                                 if ((X509_STORE_CTX_get1_issuer(&issuer_cert, ctx, client_cert) != 1) ||
2356                                     !issuer_cert) {
2357                                         /*
2358                                          *      Allow for external verify.
2359                                          */
2360                                         RERROR("Couldn't get issuer_cert for %s", common_name);
2361                                         do_verify = true;
2362
2363                                 } else {
2364                                         /*
2365                                          *      Do the full OCSP checks.
2366                                          *
2367                                          *      If they fail, don't run the external verify.  We don't want
2368                                          *      to allow admins to force authentication success for bad
2369                                          *      certificates.
2370                                          *
2371                                          *      If the OCSP checks succeed, check whether we still want to
2372                                          *      run the external verification routine.  If it's marked as
2373                                          *      "skip verify on OK", then we don't do verify.
2374                                          */
2375                                         my_ok = ocsp_check(request, ocsp_store, issuer_cert, client_cert, conf);
2376                                         if (my_ok != OCSP_STATUS_FAILED) {
2377                                                 do_verify = !conf->verify_skip_if_ocsp_ok;
2378                                         }
2379                                 }
2380                         }
2381                 }
2382 #endif
2383
2384                 if ((my_ok != OCSP_STATUS_FAILED)
2385 #ifdef HAVE_OPENSSL_OCSP_H
2386                     && do_verify
2387 #endif
2388                         ) while (conf->verify_client_cert_cmd) {
2389                         char filename[256];
2390                         int fd;
2391                         FILE *fp;
2392
2393                         snprintf(filename, sizeof(filename), "%s/%s.client.XXXXXXXX",
2394                                  conf->verify_tmp_dir, main_config.name);
2395                         fd = mkstemp(filename);
2396                         if (fd < 0) {
2397                                 RDEBUG("Failed creating file in %s: %s",
2398                                        conf->verify_tmp_dir, fr_syserror(errno));
2399                                 break;
2400                         }
2401
2402                         fp = fdopen(fd, "w");
2403                         if (!fp) {
2404                                 close(fd);
2405                                 RDEBUG("Failed opening file %s: %s",
2406                                        filename, fr_syserror(errno));
2407                                 break;
2408                         }
2409
2410                         if (!PEM_write_X509(fp, client_cert)) {
2411                                 fclose(fp);
2412                                 RDEBUG("Failed writing certificate to file");
2413                                 goto do_unlink;
2414                         }
2415                         fclose(fp);
2416
2417                         if (!pair_make_request("TLS-Client-Cert-Filename",
2418                                              filename, T_OP_SET)) {
2419                                 RDEBUG("Failed creating TLS-Client-Cert-Filename");
2420
2421                                 goto do_unlink;
2422                         }
2423
2424                         RDEBUG("Verifying client certificate: %s", conf->verify_client_cert_cmd);
2425                         if (radius_exec_program(request, NULL, 0, NULL, request, conf->verify_client_cert_cmd,
2426                                                 request->packet->vps,
2427                                                 true, true, EXEC_TIMEOUT) != 0) {
2428                                 AUTH(LOG_PREFIX ": Certificate CN (%s) fails external verification!", common_name);
2429                                 my_ok = 0;
2430
2431                         } else  if (request) {
2432                                 RDEBUG("Client certificate CN %s passed external validation", common_name);
2433                         }
2434
2435                 do_unlink:
2436                         unlink(filename);
2437                         break;
2438                 }
2439         } /* depth == 0 */
2440
2441         if (certs && request && !my_ok) {
2442                 fr_pair_add(&request->packet->vps, fr_pair_list_copy(request->packet, *certs));
2443         }
2444
2445         if (RDEBUG_ENABLED3) {
2446                 RDEBUG3("chain-depth   : %d", depth);
2447                 RDEBUG3("error         : %d", err);
2448
2449                 if (identity) RDEBUG3("identity      : %s", *identity);
2450                 RDEBUG3("common name   : %s", common_name);
2451                 RDEBUG3("subject       : %s", subject);
2452                 RDEBUG3("issuer        : %s", issuer);
2453                 RDEBUG3("verify return : %d", my_ok);
2454         }
2455
2456         return (my_ok != 0);
2457 }
2458
2459
2460 #ifdef HAVE_OPENSSL_OCSP_H
2461 /*
2462  *      Create Global X509 revocation store and use it to verify
2463  *      OCSP responses
2464  *
2465  *      - Load the trusted CAs
2466  *      - Load the trusted issuer certificates
2467  */
2468 static X509_STORE *init_revocation_store(fr_tls_server_conf_t *conf)
2469 {
2470         X509_STORE *store = NULL;
2471
2472         store = X509_STORE_new();
2473
2474         /* Load the CAs we trust */
2475         if (conf->ca_file || conf->ca_path)
2476                 if (!X509_STORE_load_locations(store, conf->ca_file, conf->ca_path)) {
2477                         tls_error_log(NULL, "Error reading Trusted root CA list \"%s\"", conf->ca_file);
2478                         return NULL;
2479                 }
2480
2481 #ifdef X509_V_FLAG_CRL_CHECK
2482         if (conf->check_crl)
2483                 X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK);
2484 #endif
2485 #ifdef X509_V_FLAG_CRL_CHECK_ALL
2486         if (conf->check_all_crl)
2487                 X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK_ALL);
2488 #endif
2489         return store;
2490 }
2491 #endif  /* HAVE_OPENSSL_OCSP_H */
2492
2493 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
2494 #ifndef OPENSSL_NO_ECDH
2495 static int set_ecdh_curve(SSL_CTX *ctx, char const *ecdh_curve, bool disable_single_dh_use)
2496 {
2497         int      nid;
2498         EC_KEY  *ecdh;
2499
2500         if (!ecdh_curve || !*ecdh_curve) return 0;
2501
2502         nid = OBJ_sn2nid(ecdh_curve);
2503         if (!nid) {
2504                 ERROR(LOG_PREFIX ": Unknown ecdh_curve \"%s\"", ecdh_curve);
2505                 return -1;
2506         }
2507
2508         ecdh = EC_KEY_new_by_curve_name(nid);
2509         if (!ecdh) {
2510                 ERROR(LOG_PREFIX ": Unable to create new curve \"%s\"", ecdh_curve);
2511                 return -1;
2512         }
2513
2514         SSL_CTX_set_tmp_ecdh(ctx, ecdh);
2515
2516         if (!disable_single_dh_use) {
2517                 SSL_CTX_set_options(ctx, SSL_OP_SINGLE_ECDH_USE);
2518         }
2519
2520         EC_KEY_free(ecdh);
2521
2522         return 0;
2523 }
2524 #endif
2525 #endif
2526
2527 /*
2528  * DIE OPENSSL DIE DIE DIE
2529  *
2530  * What a palaver, just to free some data attached the
2531  * session. We need to do this because the "remove" callback
2532  * is called when refcount > 0 sometimes, if another thread
2533  * is using the session
2534  */
2535 static void sess_free_vps(UNUSED void *parent, void *data_ptr,
2536                                 UNUSED CRYPTO_EX_DATA *ad, UNUSED int idx,
2537                                 UNUSED long argl, UNUSED void *argp)
2538 {
2539         VALUE_PAIR *vp = data_ptr;
2540         if (!vp) return;
2541
2542         DEBUG2(LOG_PREFIX ": Freeing cached session VPs");
2543
2544         fr_pair_list_free(&vp);
2545 }
2546
2547 static void sess_free_certs(UNUSED void *parent, void *data_ptr,
2548                                 UNUSED CRYPTO_EX_DATA *ad, UNUSED int idx,
2549                                 UNUSED long argl, UNUSED void *argp)
2550 {
2551         VALUE_PAIR **certs = data_ptr;
2552         if (!certs) return;
2553
2554         DEBUG2(LOG_PREFIX ": Freeing cached session Certificates");
2555
2556         fr_pair_list_free(certs);
2557 }
2558
2559 /** Add all the default ciphers and message digests reate our context.
2560  *
2561  * This should be called exactly once from main, before reading the main config
2562  * or initialising any modules.
2563  */
2564 void tls_global_init(void)
2565 {
2566         SSL_load_error_strings();       /* readable error messages (examples show call before library_init) */
2567         SSL_library_init();             /* initialize library */
2568         OpenSSL_add_all_algorithms();   /* required for SHA2 in OpenSSL < 0.9.8o and 1.0.0.a */
2569         CONF_modules_load_file(NULL, NULL, 0);
2570
2571         /*
2572          *      Initialize the index for the certificates.
2573          */
2574         fr_tls_ex_index_certs = SSL_SESSION_get_ex_new_index(0, NULL, NULL, NULL, sess_free_certs);
2575 }
2576
2577 #ifdef ENABLE_OPENSSL_VERSION_CHECK
2578 /** Check for vulnerable versions of libssl
2579  *
2580  * @param acknowledged The highest CVE number a user has confirmed is not present in the system's libssl.
2581  * @return 0 if the CVE specified by the user matches the most recent CVE we have, else -1.
2582  */
2583 int tls_global_version_check(char const *acknowledged)
2584 {
2585         uint64_t v;
2586         bool bad = false;
2587         size_t i;
2588
2589         if (strcmp(acknowledged, "yes") == 0) return 0;
2590
2591         /* Check for bad versions */
2592         v = (uint64_t) SSLeay();
2593
2594         for (i = 0; i < (sizeof(libssl_defects) / sizeof(*libssl_defects)); i++) {
2595                 libssl_defect_t *defect = &libssl_defects[i];
2596
2597                 if ((v >= defect->low) && (v <= defect->high)) {
2598                         /*
2599                          *      If the CVE is acknowledged, allow it.
2600                          */
2601                         if (!bad && (strcmp(acknowledged, defect->id) == 0)) return 0;
2602
2603                         ERROR("Refusing to start with libssl version %s (in range %s)",
2604                               ssl_version(), ssl_version_range(defect->low, defect->high));
2605                         ERROR("Security advisory %s (%s)", defect->id, defect->name);
2606                         ERROR("%s", defect->comment);
2607
2608                         /*
2609                          *      Only warn about the first one...
2610                          */
2611                         if (!bad) {
2612                                 INFO("Once you have verified libssl has been correctly patched, "
2613                                      "set security.allow_vulnerable_openssl = '%s'", defect->id);
2614
2615                                 bad = true;
2616                         }
2617                 }
2618         }
2619
2620         if (bad) return -1;
2621
2622         return 0;
2623 }
2624 #endif
2625
2626 /** Free any memory alloced by libssl
2627  *
2628  */
2629 void tls_global_cleanup(void)
2630 {
2631 #if OPENSSL_VERSION_NUMBER < 0x10000000L
2632         ERR_remove_state(0);
2633 #elif OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
2634         ERR_remove_thread_state(NULL);
2635 #endif
2636         ENGINE_cleanup();
2637         CONF_modules_unload(1);
2638         ERR_free_strings();
2639         EVP_cleanup();
2640         CRYPTO_cleanup_all_ex_data();
2641 }
2642
2643 /** Create SSL context
2644  *
2645  * - Load the trusted CAs
2646  * - Load the Private key & the certificate
2647  * - Set the Context options & Verify options
2648  */
2649 SSL_CTX *tls_init_ctx(fr_tls_server_conf_t *conf, int client)
2650 {
2651         SSL_CTX         *ctx;
2652         X509_STORE      *certstore;
2653         int             verify_mode = SSL_VERIFY_NONE;
2654         int             ctx_options = 0;
2655         int             ctx_tls_versions = 0;
2656         int             type;
2657
2658         /*
2659          *      SHA256 is in all versions of OpenSSL, but isn't
2660          *      initialized by default.  It's needed for WiMAX
2661          *      certificates.
2662          */
2663 #ifdef HAVE_OPENSSL_EVP_SHA256
2664         EVP_add_digest(EVP_sha256());
2665 #endif
2666
2667         ctx = SSL_CTX_new(SSLv23_method()); /* which is really "all known SSL / TLS methods".  Idiots. */
2668         if (!ctx) {
2669                 tls_error_log(NULL, "Failed creating TLS context");
2670                 return NULL;
2671         }
2672
2673         /*
2674          * Save the config on the context so that callbacks which
2675          * only get SSL_CTX* e.g. session persistence, can get it
2676          */
2677         SSL_CTX_set_app_data(ctx, conf);
2678
2679         /*
2680          * Identify the type of certificates that needs to be loaded
2681          */
2682         if (conf->file_type) {
2683                 type = SSL_FILETYPE_PEM;
2684         } else {
2685                 type = SSL_FILETYPE_ASN1;
2686         }
2687
2688         /*
2689          * Set the password to load private key
2690          */
2691         if (conf->private_key_password) {
2692 #ifdef __APPLE__
2693                 /*
2694                  * We don't want to put the private key password in eap.conf, so  check
2695                  * for our special string which indicates we should get the password
2696                  * programmatically.
2697                  */
2698                 char const* special_string = "Apple:UseCertAdmin";
2699                 if (strncmp(conf->private_key_password, special_string, strlen(special_string)) == 0) {
2700                         char cmd[256];
2701                         char *password;
2702                         long const max_password_len = 128;
2703                         snprintf(cmd, sizeof(cmd) - 1, "/usr/sbin/certadmin --get-private-key-passphrase \"%s\"",
2704                                  conf->private_key_file);
2705
2706                         DEBUG2(LOG_PREFIX ":  Getting private key passphrase using command \"%s\"", cmd);
2707
2708                         FILE* cmd_pipe = popen(cmd, "r");
2709                         if (!cmd_pipe) {
2710                                 ERROR(LOG_PREFIX ": %s command failed: Unable to get private_key_password", cmd);
2711                                 ERROR(LOG_PREFIX ": Error reading private_key_file %s", conf->private_key_file);
2712                                 return NULL;
2713                         }
2714
2715                         rad_const_free(conf->private_key_password);
2716                         password = talloc_array(conf, char, max_password_len);
2717                         if (!password) {
2718                                 ERROR(LOG_PREFIX ": Can't allocate space for private_key_password");
2719                                 ERROR(LOG_PREFIX ": Error reading private_key_file %s", conf->private_key_file);
2720                                 pclose(cmd_pipe);
2721                                 return NULL;
2722                         }
2723
2724                         fgets(password, max_password_len, cmd_pipe);
2725                         pclose(cmd_pipe);
2726
2727                         /* Get rid of newline at end of password. */
2728                         password[strlen(password) - 1] = '\0';
2729
2730                         DEBUG3(LOG_PREFIX ": Password from command = \"%s\"", password);
2731                         conf->private_key_password = password;
2732                 }
2733 #endif
2734
2735                 {
2736                         char *password;
2737
2738                         memcpy(&password, &conf->private_key_password, sizeof(password));
2739                         SSL_CTX_set_default_passwd_cb_userdata(ctx, password);
2740                         SSL_CTX_set_default_passwd_cb(ctx, cbtls_password);
2741                 }
2742         }
2743
2744 #ifdef PSK_MAX_IDENTITY_LEN
2745         if (!client) {
2746                 /*
2747                  *      No dynamic query exists.  There MUST be a
2748                  *      statically configured identity and password.
2749                  */
2750                 if (conf->psk_query && !*conf->psk_query) {
2751                         ERROR(LOG_PREFIX ": Invalid PSK Configuration: psk_query cannot be empty");
2752                         return NULL;
2753                 }
2754
2755                 /*
2756                  *      Set the callback only if we can check things.
2757                  */
2758                 if (conf->psk_identity || conf->psk_query) {
2759                         SSL_CTX_set_psk_server_callback(ctx, psk_server_callback);
2760                 }
2761
2762         } else if (conf->psk_query) {
2763                 ERROR(LOG_PREFIX ": Invalid PSK Configuration: psk_query cannot be used for outgoing connections");
2764                 return NULL;
2765         }
2766
2767         /*
2768          *      Now check that if PSK is being used, the config is valid.
2769          */
2770         if ((conf->psk_identity && !conf->psk_password) ||
2771             (!conf->psk_identity && conf->psk_password) ||
2772             (conf->psk_identity && !*conf->psk_identity) ||
2773             (conf->psk_password && !*conf->psk_password)) {
2774                 ERROR(LOG_PREFIX ": Invalid PSK Configuration: psk_identity or psk_password are empty");
2775                 return NULL;
2776         }
2777
2778         if (conf->psk_identity) {
2779                 size_t psk_len, hex_len;
2780                 uint8_t buffer[PSK_MAX_PSK_LEN];
2781
2782                 if (conf->certificate_file ||
2783                     conf->private_key_password || conf->private_key_file ||
2784                     conf->ca_file || conf->ca_path) {
2785                         ERROR(LOG_PREFIX ": When PSKs are used, No certificate configuration is permitted");
2786                         return NULL;
2787                 }
2788
2789                 if (client) {
2790                         SSL_CTX_set_psk_client_callback(ctx,
2791                                                         psk_client_callback);
2792                 }
2793
2794                 psk_len = strlen(conf->psk_password);
2795                 if (strlen(conf->psk_password) > (2 * PSK_MAX_PSK_LEN)) {
2796                         ERROR(LOG_PREFIX ": psk_hexphrase is too long (max %d)", PSK_MAX_PSK_LEN);
2797                         return NULL;
2798                 }
2799
2800                 /*
2801                  *      Check the password now, so that we don't have
2802                  *      errors at run-time.
2803                  */
2804                 hex_len = fr_hex2bin(buffer, sizeof(buffer), conf->psk_password, psk_len);
2805                 if (psk_len != (2 * hex_len)) {
2806                         ERROR(LOG_PREFIX ": psk_hexphrase is not all hex");
2807                         return NULL;
2808                 }
2809
2810                 goto post_ca;
2811         }
2812 #else
2813         (void) client;  /* -Wunused */
2814 #endif
2815
2816         /*
2817          *      Load our keys and certificates
2818          *
2819          *      If certificates are of type PEM then we can make use
2820          *      of cert chain authentication using openssl api call
2821          *      SSL_CTX_use_certificate_chain_file.  Please see how
2822          *      the cert chain needs to be given in PEM from
2823          *      openSSL.org
2824          */
2825         if (!conf->certificate_file) goto load_ca;
2826
2827         if (type == SSL_FILETYPE_PEM) {
2828                 if (!(SSL_CTX_use_certificate_chain_file(ctx, conf->certificate_file))) {
2829                         tls_error_log(NULL, "Failed reading certificate file \"%s\"",
2830                                       conf->certificate_file);
2831                         return NULL;
2832                 }
2833
2834         } else if (!(SSL_CTX_use_certificate_file(ctx, conf->certificate_file, type))) {
2835                 tls_error_log(NULL, "Failed reading certificate file \"%s\"",
2836                               conf->certificate_file);
2837                 return NULL;
2838         }
2839
2840         /* Load the CAs we trust */
2841 load_ca:
2842         if (conf->ca_file || conf->ca_path) {
2843                 if (!SSL_CTX_load_verify_locations(ctx, conf->ca_file, conf->ca_path)) {
2844                         tls_error_log(NULL, "Failed reading Trusted root CA list \"%s\"",
2845                                       conf->ca_file);
2846                         return NULL;
2847                 }
2848         }
2849         if (conf->ca_file && *conf->ca_file) SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(conf->ca_file));
2850
2851         if (conf->private_key_file) {
2852                 if (!(SSL_CTX_use_PrivateKey_file(ctx, conf->private_key_file, type))) {
2853                         tls_error_log(NULL, "Failed reading private key file \"%s\"",
2854                                       conf->private_key_file);
2855                         return NULL;
2856                 }
2857
2858                 /*
2859                  * Check if the loaded private key is the right one
2860                  */
2861                 if (!SSL_CTX_check_private_key(ctx)) {
2862                         ERROR(LOG_PREFIX ": Private key does not match the certificate public key");
2863                         return NULL;
2864                 }
2865         }
2866
2867 #ifdef PSK_MAX_IDENTITY_LEN
2868 post_ca:
2869 #endif
2870
2871         /*
2872          *      We never want SSLv2 or SSLv3.
2873          */
2874         ctx_options |= SSL_OP_NO_SSLv2;
2875         ctx_options |= SSL_OP_NO_SSLv3;
2876
2877         /*
2878          *      As of 3.0.5, we always allow TLSv1.1 and TLSv1.2.
2879          *      Though they can be *globally* disabled if necessary.x
2880          */
2881 #ifdef SSL_OP_NO_TLSv1
2882         if (conf->disable_tlsv1) ctx_options |= SSL_OP_NO_TLSv1;
2883
2884         ctx_tls_versions |= SSL_OP_NO_TLSv1;
2885 #endif
2886 #ifdef SSL_OP_NO_TLSv1_1
2887         if (conf->disable_tlsv1_1) ctx_options |= SSL_OP_NO_TLSv1_1;
2888
2889         ctx_tls_versions |= SSL_OP_NO_TLSv1_1;
2890 #endif
2891 #ifdef SSL_OP_NO_TLSv1_2
2892
2893         if (conf->disable_tlsv1_2) ctx_options |= SSL_OP_NO_TLSv1_2;
2894
2895         ctx_tls_versions |= SSL_OP_NO_TLSv1_2;
2896
2897 #endif
2898
2899         if ((ctx_options & ctx_tls_versions) == ctx_tls_versions) {
2900                 ERROR(LOG_PREFIX ": You have disabled all available TLS versions.  EAP will not work");
2901                 return NULL;
2902         }
2903
2904 #ifdef SSL_OP_NO_TICKET
2905         ctx_options |= SSL_OP_NO_TICKET;
2906 #endif
2907
2908         if (!conf->disable_single_dh_use) {
2909                 /*
2910                  *      SSL_OP_SINGLE_DH_USE must be used in order to prevent
2911                  *      small subgroup attacks and forward secrecy. Always
2912                  *      using SSL_OP_SINGLE_DH_USE has an impact on the
2913                  *      computer time needed during negotiation, but it is not
2914                  *      very large.
2915                  */
2916                 ctx_options |= SSL_OP_SINGLE_DH_USE;
2917         }
2918
2919         /*
2920          *      SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS to work around issues
2921          *      in Windows Vista client.
2922          *      http://www.openssl.org/~bodo/tls-cbc.txt
2923          *      http://www.nabble.com/(RADIATOR)-Radiator-Version-3.16-released-t2600070.html
2924          */
2925         ctx_options |= SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
2926
2927         if (conf->cipher_server_preference) {
2928                 /*
2929                  *      SSL_OP_CIPHER_SERVER_PREFERENCE to follow best practice
2930                  *      of nowday's TLS: do not allow poorly-selected ciphers from
2931                  *      client to take preference
2932                  */
2933                 ctx_options |= SSL_OP_CIPHER_SERVER_PREFERENCE;
2934         }
2935
2936         SSL_CTX_set_options(ctx, ctx_options);
2937
2938         /*
2939          *      TODO: Set the RSA & DH
2940          *      SSL_CTX_set_tmp_rsa_callback(ctx, cbtls_rsa);
2941          *      SSL_CTX_set_tmp_dh_callback(ctx, cbtls_dh);
2942          */
2943
2944         /*
2945          *      set the message callback to identify the type of
2946          *      message.  For every new session, there can be a
2947          *      different callback argument.
2948          *
2949          *      SSL_CTX_set_msg_callback(ctx, cbtls_msg);
2950          */
2951
2952         /*
2953          *      Set eliptical curve crypto configuration.
2954          */
2955 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
2956 #ifndef OPENSSL_NO_ECDH
2957         if (set_ecdh_curve(ctx, conf->ecdh_curve, conf->disable_single_dh_use) < 0) {
2958                 return NULL;
2959         }
2960 #endif
2961 #endif
2962
2963         /*
2964          *      OpenSSL will automatically create certificate chains,
2965          *      unless we tell it to not do that.  The problem is that
2966          *      it sometimes gets the chains right from a certificate
2967          *      signature view, but wrong from the clients view.
2968          */
2969         if (!conf->auto_chain) {
2970                 SSL_CTX_set_mode(ctx, SSL_MODE_NO_AUTO_CHAIN);
2971         }
2972
2973         /* Set Info callback */
2974         SSL_CTX_set_info_callback(ctx, cbtls_info);
2975
2976         /*
2977          *      Callbacks, etc. for session resumption.
2978          */
2979         if (conf->session_cache_enable) {
2980                 /*
2981                  *      Cache sessions on disk if requested.
2982                  */
2983                 if (conf->session_cache_path) {
2984                         SSL_CTX_sess_set_new_cb(ctx, cbtls_new_session);
2985                         SSL_CTX_sess_set_get_cb(ctx, cbtls_get_session);
2986                         SSL_CTX_sess_set_remove_cb(ctx, cbtls_remove_session);
2987                 }
2988
2989                 SSL_CTX_set_quiet_shutdown(ctx, 1);
2990                 if (fr_tls_ex_index_vps < 0)
2991                         fr_tls_ex_index_vps = SSL_SESSION_get_ex_new_index(0, NULL, NULL, NULL, sess_free_vps);
2992         }
2993
2994         /*
2995          *      Check the certificates for revocation.
2996          */
2997 #ifdef X509_V_FLAG_CRL_CHECK
2998         if (conf->check_crl) {
2999                 certstore = SSL_CTX_get_cert_store(ctx);
3000                 if (certstore == NULL) {
3001                         tls_error_log(NULL, "Error reading Certificate Store");
3002                         return NULL;
3003                 }
3004                 X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK);
3005
3006 #ifdef X509_V_FLAG_CRL_CHECK_ALL
3007                 if (conf->check_all_crl)
3008                         X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK_ALL);
3009 #endif
3010         }
3011 #endif
3012
3013         /*
3014          *      Set verify modes
3015          *      Always verify the peer certificate
3016          */
3017         verify_mode |= SSL_VERIFY_PEER;
3018         verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
3019         verify_mode |= SSL_VERIFY_CLIENT_ONCE;
3020         SSL_CTX_set_verify(ctx, verify_mode, cbtls_verify);
3021
3022         if (conf->verify_depth) {
3023                 SSL_CTX_set_verify_depth(ctx, conf->verify_depth);
3024         }
3025
3026         /* Load randomness */
3027         if (conf->random_file) {
3028                 if (!(RAND_load_file(conf->random_file, 1024*10))) {
3029                         tls_error_log(NULL, "Failed loading randomness");
3030                         return NULL;
3031                 }
3032         }
3033
3034         /*
3035          * Set the cipher list if we were told to
3036          */
3037         if (conf->cipher_list) {
3038                 if (!SSL_CTX_set_cipher_list(ctx, conf->cipher_list)) {
3039                         tls_error_log(NULL, "Failed setting cipher list");
3040                         return NULL;
3041                 }
3042         }
3043
3044         /*
3045          *      Setup session caching
3046          */
3047         if (conf->session_cache_enable) {
3048                 /*
3049                  *      Create a unique context Id per EAP-TLS configuration.
3050                  */
3051                 if (conf->session_id_name) {
3052                         snprintf(conf->session_context_id, sizeof(conf->session_context_id),
3053                                  "FR eap %s", conf->session_id_name);
3054                 } else {
3055                         snprintf(conf->session_context_id, sizeof(conf->session_context_id),
3056                                  "FR eap %p", conf);
3057                 }
3058
3059                 /*
3060                  *      Cache it, DON'T auto-clear it, and disable the internal OpenSSL session cache.
3061                  */
3062                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_SERVER | SSL_SESS_CACHE_NO_AUTO_CLEAR | SSL_SESS_CACHE_NO_INTERNAL);
3063
3064                 SSL_CTX_set_session_id_context(ctx,
3065                                                (unsigned char *) conf->session_context_id,
3066                                                (unsigned int) strlen(conf->session_context_id));
3067
3068                 /*
3069                  *      Our timeout is in hours, this is in seconds.
3070                  */
3071                 SSL_CTX_set_timeout(ctx, conf->session_timeout * 3600);
3072
3073                 /*
3074                  *      Set the maximum number of entries in the
3075                  *      session cache.
3076                  */
3077                 SSL_CTX_sess_set_cache_size(ctx, conf->session_cache_size);
3078
3079         } else {
3080                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
3081         }
3082
3083         return ctx;
3084 }
3085
3086
3087 /*
3088  *      Free TLS client/server config
3089  *      Should not be called outside this code, as a callback is
3090  *      added to automatically free the data when the CONF_SECTION
3091  *      is freed.
3092  */
3093 static int _tls_server_conf_free(fr_tls_server_conf_t *conf)
3094 {
3095         if (conf->ctx) SSL_CTX_free(conf->ctx);
3096
3097 #ifdef HAVE_OPENSSL_OCSP_H
3098         if (conf->ocsp_store) X509_STORE_free(conf->ocsp_store);
3099         conf->ocsp_store = NULL;
3100 #endif
3101
3102 #ifndef NDEBUG
3103         memset(conf, 0, sizeof(*conf));
3104 #endif
3105         return 0;
3106 }
3107
3108 fr_tls_server_conf_t *tls_server_conf_alloc(TALLOC_CTX *ctx)
3109 {
3110         fr_tls_server_conf_t *conf;
3111
3112         conf = talloc_zero(ctx, fr_tls_server_conf_t);
3113         if (!conf) {
3114                 ERROR(LOG_PREFIX ": Out of memory");
3115                 return NULL;
3116         }
3117
3118         talloc_set_destructor(conf, _tls_server_conf_free);
3119
3120         return conf;
3121 }
3122
3123 fr_tls_server_conf_t *tls_server_conf_parse(CONF_SECTION *cs)
3124 {
3125         fr_tls_server_conf_t *conf;
3126
3127         /*
3128          *      If cs has already been parsed there should be a cached copy
3129          *      of conf already stored, so just return that.
3130          */
3131         conf = cf_data_find(cs, "tls-conf");
3132         if (conf) {
3133                 DEBUG(LOG_PREFIX ": Using cached TLS configuration from previous invocation");
3134                 return conf;
3135         }
3136
3137         conf = tls_server_conf_alloc(cs);
3138
3139         if (cf_section_parse(cs, conf, tls_server_config) < 0) {
3140         error:
3141                 talloc_free(conf);
3142                 return NULL;
3143         }
3144
3145         /*
3146          *      Save people from their own stupidity.
3147          */
3148         if (conf->fragment_size < 100) conf->fragment_size = 100;
3149
3150         /*
3151          *      Only check for certificate things if we don't have a
3152          *      PSK query.
3153          */
3154         if (conf->psk_identity) {
3155                 if (conf->private_key_file) {
3156                         WARN(LOG_PREFIX ": Ignoring private key file due to psk_identity being used");
3157                 }
3158
3159                 if (conf->certificate_file) {
3160                         WARN(LOG_PREFIX ": Ignoring certificate file due to psk_identity being used");
3161                 }
3162
3163         } else {
3164                 if (!conf->private_key_file) {
3165                         ERROR(LOG_PREFIX ": TLS Server requires a private key file");
3166                         goto error;
3167                 }
3168
3169                 if (!conf->certificate_file) {
3170                         ERROR(LOG_PREFIX ": TLS Server requires a certificate file");
3171                         goto error;
3172                 }
3173         }
3174
3175         /*
3176          *      Initialize TLS
3177          */
3178         conf->ctx = tls_init_ctx(conf, 0);
3179         if (conf->ctx == NULL) {
3180                 goto error;
3181         }
3182
3183 #ifdef HAVE_OPENSSL_OCSP_H
3184         /*
3185          *      Initialize OCSP Revocation Store
3186          */
3187         if (conf->ocsp_enable) {
3188                 conf->ocsp_store = init_revocation_store(conf);
3189                 if (conf->ocsp_store == NULL) goto error;
3190         }
3191 #endif /*HAVE_OPENSSL_OCSP_H*/
3192         {
3193                 char *dh_file;
3194
3195                 memcpy(&dh_file, &conf->dh_file, sizeof(dh_file));
3196                 if (load_dh_params(conf->ctx, dh_file) < 0) {
3197                         goto error;
3198                 }
3199         }
3200
3201         if (conf->verify_tmp_dir) {
3202                 if (chmod(conf->verify_tmp_dir, S_IRWXU) < 0) {
3203                         ERROR(LOG_PREFIX ": Failed changing permissions on %s: %s",
3204                               conf->verify_tmp_dir, fr_syserror(errno));
3205                         goto error;
3206                 }
3207         }
3208
3209         if (conf->verify_client_cert_cmd && !conf->verify_tmp_dir) {
3210                 ERROR(LOG_PREFIX ": You MUST set the verify directory in order to use verify_client_cmd");
3211                 goto error;
3212         }
3213
3214 #ifdef SSL_OP_NO_TLSv1_2
3215         /*
3216          *      OpenSSL 1.0.1f and 1.0.1g get the MS-MPPE keys wrong.
3217          */
3218 #if (OPENSSL_VERSION_NUMBER >= 0x10010060L) && (OPENSSL_VERSION_NUMBER < 0x10010060L)
3219         conf->disable_tlsv1_2 = true;
3220         WARN(LOG_PREFIX ": Disabling TLSv1.2 due to OpenSSL bugs");
3221 #endif
3222 #endif
3223
3224         /*
3225          *      Cache conf in cs in case we're asked to parse this again.
3226          */
3227         cf_data_add(cs, "tls-conf", conf, NULL);
3228
3229         return conf;
3230 }
3231
3232 fr_tls_server_conf_t *tls_client_conf_parse(CONF_SECTION *cs)
3233 {
3234         fr_tls_server_conf_t *conf;
3235
3236         conf = cf_data_find(cs, "tls-conf");
3237         if (conf) {
3238                 DEBUG2(LOG_PREFIX ": Using cached TLS configuration from previous invocation");
3239                 return conf;
3240         }
3241
3242         conf = tls_server_conf_alloc(cs);
3243
3244         if (cf_section_parse(cs, conf, tls_client_config) < 0) {
3245         error:
3246                 talloc_free(conf);
3247                 return NULL;
3248         }
3249
3250         /*
3251          *      Save people from their own stupidity.
3252          */
3253         if (conf->fragment_size < 100) conf->fragment_size = 100;
3254
3255         /*
3256          *      Initialize TLS
3257          */
3258         conf->ctx = tls_init_ctx(conf, 1);
3259         if (conf->ctx == NULL) {
3260                 goto error;
3261         }
3262
3263         {
3264                 char *dh_file;
3265
3266                 memcpy(&dh_file, &conf->dh_file, sizeof(dh_file));
3267                 if (load_dh_params(conf->ctx, dh_file) < 0) {
3268                         goto error;
3269                 }
3270         }
3271
3272         cf_data_add(cs, "tls-conf", conf, NULL);
3273
3274         return conf;
3275 }
3276
3277
3278 int tls_success(tls_session_t *ssn, REQUEST *request)
3279 {
3280         VALUE_PAIR *vp, *vps = NULL;
3281         fr_tls_server_conf_t *conf;
3282         TALLOC_CTX *talloc_ctx;
3283
3284         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CONF);
3285         rad_assert(conf != NULL);
3286
3287         talloc_ctx = SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_TALLOC);
3288
3289         /*
3290          *      If there's no session resumption, delete the entry
3291          *      from the cache.  This means either it's disabled
3292          *      globally for this SSL context, OR we were told to
3293          *      disable it for this user.
3294          *
3295          *      This also means you can't turn it on just for one
3296          *      user.
3297          */
3298         if ((!ssn->allow_session_resumption) ||
3299             (((vp = fr_pair_find_by_num(request->config, PW_ALLOW_SESSION_RESUMPTION, 0, TAG_ANY)) != NULL) &&
3300              (vp->vp_integer == 0))) {
3301                 SSL_CTX_remove_session(ssn->ctx,
3302                                        ssn->ssl_session);
3303                 ssn->allow_session_resumption = false;
3304
3305                 /*
3306                  *      If we're in a resumed session and it's
3307                  *      not allowed,
3308                  */
3309                 if (SSL_session_reused(ssn->ssl)) {
3310                         RDEBUG("Forcibly stopping session resumption as it is not allowed");
3311                         return -1;
3312                 }
3313
3314         /*
3315          *      Else resumption IS allowed, so we store the
3316          *      user data in the cache.
3317          */
3318         } else if (!SSL_session_reused(ssn->ssl)) {
3319                 VALUE_PAIR **certs;
3320                 char buffer[2 * MAX_SESSION_SIZE + 1];
3321
3322                 tls_session_id(ssn->ssl_session, buffer, MAX_SESSION_SIZE);
3323
3324                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->reply->vps, PW_USER_NAME, 0, TAG_ANY);
3325                 if (vp) fr_pair_add(&vps, vp);
3326
3327                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->packet->vps, PW_STRIPPED_USER_NAME, 0, TAG_ANY);
3328                 if (vp) fr_pair_add(&vps, vp);
3329
3330                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->packet->vps, PW_STRIPPED_USER_DOMAIN, 0, TAG_ANY);
3331                 if (vp) fr_pair_add(&vps, vp);
3332
3333                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->reply->vps, PW_CHARGEABLE_USER_IDENTITY, 0, TAG_ANY);
3334                 if (vp) fr_pair_add(&vps, vp);
3335
3336                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->reply->vps, PW_CACHED_SESSION_POLICY, 0, TAG_ANY);
3337                 if (vp) fr_pair_add(&vps, vp);
3338
3339                 certs = (VALUE_PAIR **)SSL_get_ex_data(ssn->ssl, fr_tls_ex_index_certs);
3340
3341                 /*
3342                  *      Hmm... the certs should probably be session data.
3343                  */
3344                 if (certs) {
3345                         /*
3346                          *      @todo: some go into reply, others into
3347                          *      request
3348                          */
3349                         fr_pair_add(&vps, fr_pair_list_copy(talloc_ctx, *certs));
3350
3351                         /*
3352                          *      Save the certs in the packet, so that we can see them.
3353                          */
3354                         fr_pair_add(&request->packet->vps, fr_pair_list_copy(request->packet, *certs));
3355
3356                         vp = fr_pair_find_by_num(request->packet->vps, PW_TLS_CLIENT_CERT_EXPIRATION, 0, TAG_ANY);
3357                         if (vp) {
3358                                 time_t expires;
3359
3360                                 if (ocsp_asn1time_to_epoch(&expires, vp->vp_strvalue) < 0) {
3361                                         RDEBUG2("Failed getting certificate expiration, removing cache entry for session %s", buffer);
3362                                         SSL_CTX_remove_session(ssn->ctx, ssn->ssl_session);
3363                                         return -1;
3364                                 }
3365
3366                                 if (expires <= request->timestamp) {
3367                                         RDEBUG2("Certificate has expired, removing cache entry for session %s", buffer);
3368                                         SSL_CTX_remove_session(ssn->ctx, ssn->ssl_session);
3369                                         return -1;
3370                                 }
3371
3372                                 /*
3373                                  *      Account for Session-Timeout, if it's available.
3374                                  */
3375                                 vp = fr_pair_find_by_num(request->reply->vps, PW_SESSION_TIMEOUT, 0, TAG_ANY);
3376                                 if (vp) {
3377                                         if ((request->timestamp + vp->vp_integer) > expires) {
3378                                                 vp->vp_integer = expires - request->timestamp;
3379                                                 RWDEBUG2("Updating Session-Timeout to %u, due to impending certificate expiration",
3380                                                          vp->vp_integer);
3381                                         }
3382                                 }
3383                         }
3384                 }
3385
3386                 if (vps) {
3387                         SSL_SESSION_set_ex_data(ssn->ssl_session, fr_tls_ex_index_vps, vps);
3388                         rdebug_pair_list(L_DBG_LVL_2, request, vps, "  caching ");
3389
3390                         if (conf->session_cache_path) {
3391                                 /* write the VPs to the cache file */
3392                                 char filename[256], buf[1024];
3393                                 FILE *vp_file;
3394
3395                                 RDEBUG2("Saving session %s in the disk cache", buffer);
3396
3397                                 snprintf(filename, sizeof(filename), "%s%c%s.vps", conf->session_cache_path,
3398                                          FR_DIR_SEP, buffer);
3399                                 vp_file = fopen(filename, "w");
3400                                 if (vp_file == NULL) {
3401                                         RWDEBUG("Could not write session VPs to persistent cache: %s",
3402                                                 fr_syserror(errno));
3403                                 } else {
3404                                         VALUE_PAIR *prev = NULL;
3405                                         vp_cursor_t cursor;
3406                                         /* generate a dummy user-style entry which is easy to read back */
3407                                         fprintf(vp_file, "# SSL cached session\n");
3408                                         fprintf(vp_file, "%s\n\t", buffer);
3409
3410                                         for (vp = fr_cursor_init(&cursor, &vps);
3411                                              vp;
3412                                              vp = fr_cursor_next(&cursor)) {
3413                                                 /*
3414                                                  *      Terminate the previous line.
3415                                                  */
3416                                                 if (prev) fprintf(vp_file, ",\n\t");
3417
3418                                                 /*
3419                                                  *      Write this one.
3420                                                  */
3421                                                 vp_prints(buf, sizeof(buf), vp);
3422                                                 fputs(buf, vp_file);
3423                                                 prev = vp;
3424                                         }
3425
3426                                         /*
3427                                          *      Terminate the final line.
3428                                          */
3429                                         fprintf(vp_file, "\n");
3430                                         fclose(vp_file);
3431                                 }
3432                         } else {
3433                                 RDEBUG("Failed to find 'persist_dir' in TLS configuration.  Session will not be cached on disk.");
3434                         }
3435                 } else {
3436                         RDEBUG2("No information to cache: session caching will be disabled for session %s", buffer);
3437                         SSL_CTX_remove_session(ssn->ctx, ssn->ssl_session);
3438                 }
3439
3440         /*
3441          *      Else the session WAS allowed.  Copy the cached reply.
3442          */
3443         } else {
3444                 char buffer[2 * MAX_SESSION_SIZE + 1];
3445
3446                 tls_session_id(ssn->ssl_session, buffer, MAX_SESSION_SIZE);
3447
3448                 /*
3449                  *      The "restore VPs from OpenSSL cache" code is
3450                  *      now in eaptls_process()
3451                  */
3452
3453                 if (conf->session_cache_path) {
3454                         /* "touch" the cached session/vp file */
3455                         char filename[256];
3456
3457                         snprintf(filename, sizeof(filename), "%s%c%s.asn1",
3458                                  conf->session_cache_path, FR_DIR_SEP, buffer);
3459                         utime(filename, NULL);
3460                         snprintf(filename, sizeof(filename), "%s%c%s.vps",
3461                                  conf->session_cache_path, FR_DIR_SEP, buffer);
3462                         utime(filename, NULL);
3463                 }
3464
3465                 /*
3466                  *      Mark the request as resumed.
3467                  */
3468                 pair_make_request("EAP-Session-Resumed", "1", T_OP_SET);
3469         }
3470
3471         return 0;
3472 }
3473
3474
3475 void tls_fail(tls_session_t *ssn)
3476 {
3477         /*
3478          *      Force the session to NOT be cached.
3479          */
3480         SSL_CTX_remove_session(ssn->ctx, ssn->ssl_session);
3481 }
3482
3483 fr_tls_status_t tls_application_data(tls_session_t *ssn, REQUEST *request)
3484
3485 {
3486         int err;
3487         VALUE_PAIR **certs;
3488
3489         /*
3490          *      Decrypt the complete record.
3491          */
3492         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data,
3493                         ssn->dirty_in.used);
3494         if (err != (int) ssn->dirty_in.used) {
3495                 record_init(&ssn->dirty_in);
3496                 RDEBUG("Failed writing %zd bytes to SSL BIO: %d", ssn->dirty_in.used, err);
3497                 return FR_TLS_FAIL;
3498         }
3499
3500         /*
3501          *      Clear the dirty buffer now that we are done with it
3502          *      and init the clean_out buffer to store decrypted data
3503          */
3504         record_init(&ssn->dirty_in);
3505         record_init(&ssn->clean_out);
3506
3507         /*
3508          *      Read (and decrypt) the tunneled data from the
3509          *      SSL session, and put it into the decrypted
3510          *      data buffer.
3511          */
3512         err = SSL_read(ssn->ssl, ssn->clean_out.data, sizeof(ssn->clean_out.data));
3513         if (err < 0) {
3514                 int code;
3515
3516                 RDEBUG("SSL_read Error");
3517
3518                 code = SSL_get_error(ssn->ssl, err);
3519                 switch (code) {
3520                 case SSL_ERROR_WANT_READ:
3521                         DEBUG("Error in fragmentation logic: SSL_WANT_READ");
3522                         return FR_TLS_MORE_FRAGMENTS;
3523
3524                 case SSL_ERROR_WANT_WRITE:
3525                         DEBUG("Error in fragmentation logic: SSL_WANT_WRITE");
3526                         break;
3527
3528                 default:
3529                         REDEBUG("Error in fragmentation logic");
3530                         tls_error_io_log(request, ssn, err,
3531                                          "Failed in " STRINGIFY(__FUNCTION__) " (SSL_read)");
3532                         break;
3533                 }
3534                 return FR_TLS_FAIL;
3535         }
3536
3537         if (err == 0) RWDEBUG("No data inside of the tunnel");
3538
3539         /*
3540          *      Passed all checks, successfully decrypted data
3541          */
3542         ssn->clean_out.used = err;
3543
3544         /*
3545          *      Add the certificates to intermediate packets, so that
3546          *      the inner tunnel policies can use them.
3547          */
3548         certs = (VALUE_PAIR **)SSL_get_ex_data(ssn->ssl, fr_tls_ex_index_certs);
3549
3550         if (certs) fr_pair_add(&request->packet->vps, fr_pair_list_copy(request->packet, *certs));
3551
3552         return FR_TLS_OK;
3553 }
3554
3555
3556 /*
3557  * Acknowledge received is for one of the following messages sent earlier
3558  * 1. Handshake completed Message, so now send, EAP-Success
3559  * 2. Alert Message, now send, EAP-Failure
3560  * 3. Fragment Message, now send, next Fragment
3561  */
3562 fr_tls_status_t tls_ack_handler(tls_session_t *ssn, REQUEST *request)
3563 {
3564         if (ssn == NULL){
3565                 REDEBUG("Unexpected ACK received:  No ongoing SSL session");
3566                 return FR_TLS_INVALID;
3567         }
3568         if (!ssn->info.initialized) {
3569                 RDEBUG("No SSL info available.  Waiting for more SSL data");
3570                 return FR_TLS_REQUEST;
3571         }
3572
3573         if ((ssn->info.content_type == handshake) && (ssn->info.origin == 0)) {
3574                 REDEBUG("Unexpected ACK received:  We sent no previous messages");
3575                 return FR_TLS_INVALID;
3576         }
3577
3578         switch (ssn->info.content_type) {
3579         case alert:
3580                 RDEBUG2("Peer ACKed our alert");
3581                 return FR_TLS_FAIL;
3582
3583         case handshake:
3584                 if ((ssn->info.handshake_type == handshake_finished) && (ssn->dirty_out.used == 0)) {
3585                         RDEBUG2("Peer ACKed our handshake fragment.  handshake is finished");
3586
3587                         /*
3588                          *      From now on all the content is
3589                          *      application data set it here as nobody else
3590                          *      sets it.
3591                          */
3592                         ssn->info.content_type = application_data;
3593                         return FR_TLS_SUCCESS;
3594                 } /* else more data to send */
3595
3596                 RDEBUG2("Peer ACKed our handshake fragment");
3597                 /* Fragmentation handler, send next fragment */
3598                 return FR_TLS_REQUEST;
3599
3600         case application_data:
3601                 RDEBUG2("Peer ACKed our application data fragment");
3602                 return FR_TLS_REQUEST;
3603
3604                 /*
3605                  *      For the rest of the conditions, switch over
3606                  *      to the default section below.
3607                  */
3608         default:
3609                 REDEBUG("Invalid ACK received: %d", ssn->info.content_type);
3610                 return FR_TLS_INVALID;
3611         }
3612 }
3613 #endif  /* WITH_TLS */
3614