src/main/tls_listen.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 WITH_TLS
  37 #ifdef HAVE_OPENSSL_RAND_H
  38 #include <openssl/rand.h>
  39 #endif
  40
  41 #ifdef HAVE_OPENSSL_OCSP_H
  42 #include <openssl/ocsp.h>
  43 #endif
  44
  45 #ifdef HAVE_PTHREAD_H
  46 #define PTHREAD_MUTEX_LOCK pthread_mutex_lock
  47 #define PTHREAD_MUTEX_UNLOCK pthread_mutex_unlock
  48 #else
  49 #define PTHREAD_MUTEX_LOCK(_x)
  50 #define PTHREAD_MUTEX_UNLOCK(_x)
  51 #endif
  52
  53 static void dump_hex(char const *msg, uint8_t const *data, size_t data_len)
  54 {
  55         size_t i;
  56
  57         if (debug_flag < 3) return;
  58
  59         printf("%s %d\n", msg, (int) data_len);
  60         if (data_len > 256) data_len = 256;
  61
  62         for (i = 0; i < data_len; i++) {
  63                 if ((i & 0x0f) == 0x00) printf ("%02x: ", (unsigned int) i);
  64                 printf("%02x ", data[i]);
  65                 if ((i & 0x0f) == 0x0f) printf ("\n");
  66         }
  67         printf("\n");
  68         fflush(stdout);
  69 }
  70
  71 static void tls_socket_close(rad_listen_t *listener)
  72 {
  73         listen_socket_t *sock = listener->data;
  74
  75         SSL_shutdown(sock->ssn->ssl);
  76
  77         listener->status = RAD_LISTEN_STATUS_EOL;
  78         listener->tls = NULL; /* parent owns this! */
  79
  80         /*
  81          *      Tell the event handler that an FD has disappeared.
  82          */
  83         DEBUG("Client has closed connection");
  84         radius_update_listener(listener);
  85
  86         /*
  87          *      Do NOT free the listener here.  It's in use by
  88          *      a request, and will need to hang around until
  89          *      all of the requests are done.
  90          *
  91          *      It is instead free'd in remove_from_request_hash()
  92          */
  93 }
  94
  95 static int CC_HINT(nonnull) tls_socket_write(rad_listen_t *listener, REQUEST *request)
  96 {
  97         uint8_t *p;
  98         ssize_t rcode;
  99         listen_socket_t *sock = listener->data;
 100
 101         p = sock->ssn->dirty_out.data;
 102
 103         while (p < (sock->ssn->dirty_out.data + sock->ssn->dirty_out.used)) {
 104                 RDEBUG3("Writing to socket %d", request->packet->sockfd);
 105                 rcode = write(request->packet->sockfd, p,
 106                               (sock->ssn->dirty_out.data + sock->ssn->dirty_out.used) - p);
 107                 if (rcode <= 0) {
 108                         RDEBUG("Error writing to TLS socket: %s", fr_syserror(errno));
 109
 110                         tls_socket_close(listener);
 111                         return 0;
 112                 }
 113                 p += rcode;
 114         }
 115
 116         sock->ssn->dirty_out.used = 0;
 117
 118         return 1;
 119 }
 120
 121
 122 static int tls_socket_recv(rad_listen_t *listener)
 123 {
 124         bool doing_init = false;
 125         ssize_t rcode;
 126         RADIUS_PACKET *packet;
 127         REQUEST *request;
 128         listen_socket_t *sock = listener->data;
 129         fr_tls_status_t status;
 130         RADCLIENT *client = sock->client;
 131
 132         if (!sock->packet) {
 133                 sock->packet = rad_alloc(sock, 0);
 134                 if (!sock->packet) return 0;
 135
 136                 sock->packet->sockfd = listener->fd;
 137                 sock->packet->src_ipaddr = sock->other_ipaddr;
 138                 sock->packet->src_port = sock->other_port;
 139                 sock->packet->dst_ipaddr = sock->my_ipaddr;
 140                 sock->packet->dst_port = sock->my_port;
 141
 142                 if (sock->request) {
 143                         sock->request->packet = talloc_steal(sock->request, sock->packet);
 144                 }
 145         }
 146
 147         /*
 148          *      Allocate a REQUEST for debugging.
 149          */
 150         if (!sock->request) {
 151                 sock->request = request = request_alloc(NULL);
 152                 if (!sock->request) {
 153                         ERROR("Out of memory");
 154                         return 0;
 155                 }
 156
 157                 rad_assert(request->packet == NULL);
 158                 rad_assert(sock->packet != NULL);
 159                 request->packet = talloc_steal(request, sock->packet);
 160
 161                 request->component = "<core>";
 162                 request->component = "<tls-connect>";
 163
 164                 /*
 165                  *      Not sure if we should do this on every packet...
 166                  */
 167                 request->reply = rad_alloc(request, 0);
 168                 if (!request->reply) return 0;
 169
 170                 rad_assert(sock->ssn == NULL);
 171
 172                 sock->ssn = tls_new_session(listener->tls, listener->tls, sock->request,
 173                                             listener->tls->require_client_cert);
 174                 if (!sock->ssn) {
 175                         TALLOC_FREE(sock->request);
 176                         sock->packet = NULL;
 177                         return 0;
 178                 }
 179
 180                 (void) talloc_steal(sock, sock->ssn);
 181                 SSL_set_ex_data(sock->ssn->ssl, FR_TLS_EX_INDEX_REQUEST, (void *)request);
 182                 SSL_set_ex_data(sock->ssn->ssl, FR_TLS_EX_INDEX_CERTS, (void *)&request->packet->vps);
 183                 SSL_set_ex_data(sock->ssn->ssl, FR_TLS_EX_INDEX_TALLOC, sock->parent);
 184
 185                 doing_init = true;
 186         }
 187
 188         rad_assert(sock->request != NULL);
 189         rad_assert(sock->request->packet != NULL);
 190         rad_assert(sock->packet != NULL);
 191         rad_assert(sock->ssn != NULL);
 192
 193         request = sock->request;
 194
 195         RDEBUG3("Reading from socket %d", request->packet->sockfd);
 196         PTHREAD_MUTEX_LOCK(&sock->mutex);
 197         rcode = read(request->packet->sockfd,
 198                      sock->ssn->dirty_in.data,
 199                      sizeof(sock->ssn->dirty_in.data));
 200         if ((rcode < 0) && (errno == ECONNRESET)) {
 201         do_close:
 202                 DEBUG("Closing TLS socket from client port %u", sock->other_port);
 203                 tls_socket_close(listener);
 204                 PTHREAD_MUTEX_UNLOCK(&sock->mutex);
 205                 return 0;
 206         }
 207
 208         if (rcode < 0) {
 209                 RDEBUG("Error reading TLS socket: %s", fr_syserror(errno));
 210                 goto do_close;
 211         }
 212
 213         /*
 214          *      Normal socket close.
 215          */
 216         if (rcode == 0) goto do_close;
 217
 218         sock->ssn->dirty_in.used = rcode;
 219
 220         dump_hex("READ FROM SSL", sock->ssn->dirty_in.data, sock->ssn->dirty_in.used);
 221
 222         /*
 223          *      Catch attempts to use non-SSL.
 224          */
 225         if (doing_init && (sock->ssn->dirty_in.data[0] != handshake)) {
 226                 RDEBUG("Non-TLS data sent to TLS socket: closing");
 227                 goto do_close;
 228         }
 229
 230         /*
 231          *      Skip ahead to reading application data.
 232          */
 233         if (SSL_is_init_finished(sock->ssn->ssl)) goto app;
 234
 235         if (!tls_handshake_recv(request, sock->ssn)) {
 236                 RDEBUG("FAILED in TLS handshake receive");
 237                 goto do_close;
 238         }
 239
 240         if (sock->ssn->dirty_out.used > 0) {
 241                 tls_socket_write(listener, request);
 242                 PTHREAD_MUTEX_UNLOCK(&sock->mutex);
 243                 return 0;
 244         }
 245
 246 app:
 247         /*
 248          *      FIXME: Run the packet through a virtual server in
 249          *      order to see if we like the certificate presented by
 250          *      the client.
 251          */
 252
 253         status = tls_application_data(sock->ssn, request);
 254         RDEBUG("Application data status %d", status);
 255
 256         if (status == FR_TLS_MORE_FRAGMENTS) {
 257                 PTHREAD_MUTEX_UNLOCK(&sock->mutex);
 258                 return 0;
 259         }
 260
 261         if (sock->ssn->clean_out.used == 0) {
 262                 PTHREAD_MUTEX_UNLOCK(&sock->mutex);
 263                 return 0;
 264         }
 265
 266         dump_hex("TUNNELED DATA > ", sock->ssn->clean_out.data, sock->ssn->clean_out.used);
 267
 268         /*
 269          *      If the packet is a complete RADIUS packet, return it to
 270          *      the caller.  Otherwise...
 271          */
 272         if ((sock->ssn->clean_out.used < 20) ||
 273             (((sock->ssn->clean_out.data[2] << 8) | sock->ssn->clean_out.data[3]) != (int) sock->ssn->clean_out.used)) {
 274                 RDEBUG("Received bad packet: Length %d contents %d",
 275                        sock->ssn->clean_out.used,
 276                        (sock->ssn->clean_out.data[2] << 8) | sock->ssn->clean_out.data[3]);
 277                 goto do_close;
 278         }
 279
 280         packet = sock->packet;
 281         packet->data = talloc_array(packet, uint8_t, sock->ssn->clean_out.used);
 282         packet->data_len = sock->ssn->clean_out.used;
 283         sock->ssn->record_minus(&sock->ssn->clean_out, packet->data, packet->data_len);
 284         packet->vps = NULL;
 285         PTHREAD_MUTEX_UNLOCK(&sock->mutex);
 286
 287         if (!rad_packet_ok(packet, 0, NULL)) {
 288                 RDEBUG("Received bad packet: %s", fr_strerror());
 289                 DEBUG("Closing TLS socket from client");
 290                 PTHREAD_MUTEX_LOCK(&sock->mutex);
 291                 tls_socket_close(listener);
 292                 PTHREAD_MUTEX_UNLOCK(&sock->mutex);
 293                 return 0;       /* do_close unlocks the mutex */
 294         }
 295
 296         /*
 297          *      Copied from src/lib/radius.c, rad_recv();
 298          */
 299         if (fr_debug_flag) {
 300                 char host_ipaddr[128];
 301
 302                 if (is_radius_code(packet->code)) {
 303                         RDEBUG("tls_recv: %s packet from host %s port %d, id=%d, length=%d",
 304                                fr_packet_codes[packet->code],
 305                                inet_ntop(packet->src_ipaddr.af,
 306                                          &packet->src_ipaddr.ipaddr,
 307                                          host_ipaddr, sizeof(host_ipaddr)),
 308                                packet->src_port,
 309                                packet->id, (int) packet->data_len);
 310                 } else {
 311                         RDEBUG("tls_recv: Packet from host %s port %d code=%d, id=%d, length=%d",
 312                                inet_ntop(packet->src_ipaddr.af,
 313                                          &packet->src_ipaddr.ipaddr,
 314                                          host_ipaddr, sizeof(host_ipaddr)),
 315                                packet->src_port,
 316                                packet->code,
 317                                packet->id, (int) packet->data_len);
 318                 }
 319         }
 320
 321         FR_STATS_INC(auth, total_requests);
 322
 323         return 1;
 324 }
 325
 326
 327 int dual_tls_recv(rad_listen_t *listener)
 328 {
 329         RADIUS_PACKET *packet;
 330         REQUEST *request;
 331         RAD_REQUEST_FUNP fun = NULL;
 332         listen_socket_t *sock = listener->data;
 333         RADCLIENT       *client = sock->client;
 334
 335         if (listener->status != RAD_LISTEN_STATUS_KNOWN) return 0;
 336
 337         if (!tls_socket_recv(listener)) {
 338                 return 0;
 339         }
 340
 341         rad_assert(sock->request != NULL);
 342         rad_assert(sock->request->packet != NULL);
 343         rad_assert(sock->packet != NULL);
 344         rad_assert(sock->ssn != NULL);
 345         rad_assert(client != NULL);
 346
 347         request = sock->request;
 348         packet = sock->packet;
 349
 350         /*
 351          *      Some sanity checks, based on the packet code.
 352          *
 353          *      "auth+acct" are marked as "auth", with the "dual" flag
 354          *      set.
 355          */
 356         switch(packet->code) {
 357         case PW_CODE_ACCESS_REQUEST:
 358                 if (listener->type != RAD_LISTEN_AUTH) goto bad_packet;
 359                 FR_STATS_INC(auth, total_requests);
 360                 fun = rad_authenticate;
 361                 break;
 362
 363 #ifdef WITH_ACCOUNTING
 364         case PW_CODE_ACCOUNTING_REQUEST:
 365                 if (listener->type != RAD_LISTEN_ACCT) {
 366                         /*
 367                          *      Allow auth + dual.  Disallow
 368                          *      everything else.
 369                          */
 370                         if (!((listener->type == RAD_LISTEN_AUTH) &&
 371                               (listener->dual))) {
 372                                     goto bad_packet;
 373                         }
 374                 }
 375                 FR_STATS_INC(acct, total_requests);
 376                 fun = rad_accounting;
 377                 break;
 378 #endif
 379
 380         case PW_CODE_STATUS_SERVER:
 381                 if (!main_config.status_server) {
 382                         FR_STATS_INC(auth, total_unknown_types);
 383                         WARN("Ignoring Status-Server request due to security configuration");
 384                         rad_free(&sock->packet);
 385                         request->packet = NULL;
 386                         return 0;
 387                 }
 388                 fun = rad_status_server;
 389                 break;
 390
 391         default:
 392         bad_packet:
 393                 FR_STATS_INC(auth, total_unknown_types);
 394
 395                 DEBUG("Invalid packet code %d sent from client %s port %d : IGNORED",
 396                       packet->code, client->shortname, packet->src_port);
 397                 rad_free(&sock->packet);
 398                 request->packet = NULL;
 399                 return 0;
 400         } /* switch over packet types */
 401
 402         if (!request_receive(listener, packet, client, fun)) {
 403                 FR_STATS_INC(auth, total_packets_dropped);
 404                 rad_free(&sock->packet);
 405                 request->packet = NULL;
 406                 return 0;
 407         }
 408
 409         sock->packet = NULL;    /* we have no need for more partial reads */
 410         request->packet = NULL;
 411
 412         return 1;
 413 }
 414
 415
 416 /*
 417  *      Send a response packet
 418  */
 419 int dual_tls_send(rad_listen_t *listener, REQUEST *request)
 420 {
 421         listen_socket_t *sock = listener->data;
 422
 423         VERIFY_REQUEST(request);
 424
 425         rad_assert(request->listener == listener);
 426         rad_assert(listener->send == dual_tls_send);
 427
 428         if (listener->status != RAD_LISTEN_STATUS_KNOWN) return 0;
 429
 430         /*
 431          *      Accounting reject's are silently dropped.
 432          *
 433          *      We do it here to avoid polluting the rest of the
 434          *      code with this knowledge
 435          */
 436         if (request->reply->code == 0) return 0;
 437
 438         /*
 439          *      Pack the VPs
 440          */
 441         if (rad_encode(request->reply, request->packet,
 442                        request->client->secret) < 0) {
 443                 RERROR("Failed encoding packet: %s", fr_strerror());
 444                 return 0;
 445         }
 446
 447         /*
 448          *      Sign the packet.
 449          */
 450         if (rad_sign(request->reply, request->packet,
 451                        request->client->secret) < 0) {
 452                 RERROR("Failed signing packet: %s", fr_strerror());
 453                 return 0;
 454         }
 455
 456         PTHREAD_MUTEX_LOCK(&sock->mutex);
 457
 458         /*
 459          *      Write the packet to the SSL buffers.
 460          */
 461         sock->ssn->record_plus(&sock->ssn->clean_in,
 462                                request->reply->data, request->reply->data_len);
 463
 464         dump_hex("TUNNELED DATA < ", sock->ssn->clean_in.data, sock->ssn->clean_in.used);
 465
 466         /*
 467          *      Do SSL magic to get encrypted data.
 468          */
 469         tls_handshake_send(request, sock->ssn);
 470
 471         /*
 472          *      And finally write the data to the socket.
 473          */
 474         if (sock->ssn->dirty_out.used > 0) {
 475                 dump_hex("WRITE TO SSL", sock->ssn->dirty_out.data, sock->ssn->dirty_out.used);
 476
 477                 tls_socket_write(listener, request);
 478         }
 479         PTHREAD_MUTEX_UNLOCK(&sock->mutex);
 480
 481         return 0;
 482 }
 483
 484
 485 #ifdef WITH_PROXY
 486 /*
 487  *      Read from the SSL socket.  Safe with either blocking or
 488  *      non-blocking IO.  This level of complexity is probably not
 489  *      necessary, as each packet gets put into one SSL application
 490  *      record.  When SSL has a full record, we should be able to read
 491  *      the entire packet via one SSL_read().
 492  *
 493  *      When SSL has a partial record, SSL_read() will return
 494  *      WANT_READ or WANT_WRITE, and zero application data.
 495  *
 496  *      Called with the mutex held.
 497  */
 498 static ssize_t proxy_tls_read(rad_listen_t *listener)
 499 {
 500         int rcode;
 501         size_t length;
 502         uint8_t *data;
 503         listen_socket_t *sock = listener->data;
 504
 505         /*
 506          *      Get the maximum size of data to receive.
 507          */
 508         if (!sock->data) sock->data = talloc_array(sock, uint8_t,
 509                                                    sock->ssn->offset);
 510
 511         data = sock->data;
 512
 513         if (sock->partial < 4) {
 514                 rcode = SSL_read(sock->ssn->ssl, data + sock->partial,
 515                                  4 - sock->partial);
 516                 if (rcode <= 0) {
 517                         int err = SSL_get_error(sock->ssn->ssl, rcode);
 518                         switch (err) {
 519                         case SSL_ERROR_WANT_READ:
 520                         case SSL_ERROR_WANT_WRITE:
 521                                 return 0; /* do some more work later */
 522
 523                         case SSL_ERROR_ZERO_RETURN:
 524                                 /* remote end sent close_notify, send one back */
 525                                 SSL_shutdown(sock->ssn->ssl);
 526
 527                         case SSL_ERROR_SYSCALL:
 528                         do_close:
 529                                 return -1;
 530
 531                         default:
 532                                 while ((err = ERR_get_error())) {
 533                                         DEBUG("proxy recv says %s",
 534                                               ERR_error_string(err, NULL));
 535                                 }
 536
 537                                 goto do_close;
 538                         }
 539                 }
 540
 541                 sock->partial = rcode;
 542         } /* try reading the packet header */
 543
 544         if (sock->partial < 4) return 0; /* read more data */
 545
 546         length = (data[2] << 8) | data[3];
 547
 548         /*
 549          *      Do these checks only once, when we read the header.
 550          */
 551         if (sock->partial == 4) {
 552                 DEBUG3("Proxy received header saying we have a packet of %u bytes",
 553                        (unsigned int) length);
 554
 555                 /*
 556                  *      FIXME: allocate a RADIUS_PACKET, and set
 557                  *      "data" to be as large as necessary.
 558                  */
 559                 if (length > sock->ssn->offset) {
 560                         INFO("Received packet will be too large! Set \"fragment_size = %u\"",
 561                              (data[2] << 8) | data[3]);
 562                         goto do_close;
 563                 }
 564         }
 565
 566         /*
 567          *      Try to read some more.
 568          */
 569         if (sock->partial < length) {
 570                 rcode = SSL_read(sock->ssn->ssl, data + sock->partial,
 571                                  length - sock->partial);
 572                 if (rcode <= 0) {
 573                         switch (SSL_get_error(sock->ssn->ssl, rcode)) {
 574                         case SSL_ERROR_WANT_READ:
 575                         case SSL_ERROR_WANT_WRITE:
 576                                 return 0;
 577
 578                         case SSL_ERROR_ZERO_RETURN:
 579                                 /* remote end sent close_notify, send one back */
 580                                 SSL_shutdown(sock->ssn->ssl);
 581                                 goto do_close;
 582                         default:
 583                                 goto do_close;
 584                         }
 585                 }
 586
 587                 sock->partial += rcode;
 588         }
 589
 590         /*
 591          *      If we're not done, say so.
 592          *
 593          *      Otherwise, reset the partially read data flag, and say
 594          *      we have a packet.
 595          */
 596         if (sock->partial < length) {
 597                 return 0;
 598         }
 599
 600         sock->partial = 0;      /* we've now read the packet */
 601         return length;
 602 }
 603
 604
 605 int proxy_tls_recv(rad_listen_t *listener)
 606 {
 607         listen_socket_t *sock = listener->data;
 608         char buffer[256];
 609         RADIUS_PACKET *packet;
 610         uint8_t *data;
 611         ssize_t data_len;
 612
 613         if (listener->status != RAD_LISTEN_STATUS_KNOWN) return 0;
 614
 615         DEBUG3("Proxy SSL socket has data to read");
 616         PTHREAD_MUTEX_LOCK(&sock->mutex);
 617         data_len = proxy_tls_read(listener);
 618         PTHREAD_MUTEX_UNLOCK(&sock->mutex);
 619
 620         if (data_len < 0) {
 621                 DEBUG("Closing TLS socket to home server");
 622                 PTHREAD_MUTEX_LOCK(&sock->mutex);
 623                 tls_socket_close(listener);
 624                 PTHREAD_MUTEX_UNLOCK(&sock->mutex);
 625                 return 0;
 626         }
 627
 628         if (data_len == 0) return 0; /* not done yet */
 629
 630         data = sock->data;
 631
 632         packet = rad_alloc(sock, 0);
 633         packet->sockfd = listener->fd;
 634         packet->src_ipaddr = sock->other_ipaddr;
 635         packet->src_port = sock->other_port;
 636         packet->dst_ipaddr = sock->my_ipaddr;
 637         packet->dst_port = sock->my_port;
 638         packet->code = data[0];
 639         packet->id = data[1];
 640         packet->data_len = data_len;
 641         packet->data = talloc_array(packet, uint8_t, packet->data_len);
 642         memcpy(packet->data, data, packet->data_len);
 643         memcpy(packet->vector, packet->data + 4, 16);
 644
 645         /*
 646          *      FIXME: Client MIB updates?
 647          */
 648         switch(packet->code) {
 649         case PW_CODE_ACCESS_ACCEPT:
 650         case PW_CODE_ACCESS_CHALLENGE:
 651         case PW_CODE_ACCESS_REJECT:
 652                 break;
 653
 654 #ifdef WITH_ACCOUNTING
 655         case PW_CODE_ACCOUNTING_RESPONSE:
 656                 break;
 657 #endif
 658
 659         default:
 660                 /*
 661                  *      FIXME: Update MIB for packet types?
 662                  */
 663                 ERROR("Invalid packet code %d sent to a proxy port "
 664                        "from home server %s port %d - ID %d : IGNORED",
 665                        packet->code,
 666                        ip_ntoh(&packet->src_ipaddr, buffer, sizeof(buffer)),
 667                        packet->src_port, packet->id);
 668                 rad_free(&packet);
 669                 return 0;
 670         }
 671
 672         if (!request_proxy_reply(packet)) {
 673                 rad_free(&packet);
 674                 return 0;
 675         }
 676
 677         return 1;
 678 }
 679
 680
 681 int proxy_tls_send(rad_listen_t *listener, REQUEST *request)
 682 {
 683         int rcode;
 684         listen_socket_t *sock = listener->data;
 685
 686         VERIFY_REQUEST(request);
 687
 688         if ((listener->status != RAD_LISTEN_STATUS_INIT) &&
 689             (listener->status != RAD_LISTEN_STATUS_KNOWN)) return 0;
 690
 691         /*
 692          *      Normal proxying calls us with the data already
 693          *      encoded.  The "ping home server" code does not.  So,
 694          *      if there's no packet, encode it here.
 695          */
 696         if (!request->proxy->data) {
 697                 request->proxy_listener->encode(request->proxy_listener,
 698                                                 request);
 699         }
 700
 701         DEBUG3("Proxy is writing %u bytes to SSL",
 702                (unsigned int) request->proxy->data_len);
 703         PTHREAD_MUTEX_LOCK(&sock->mutex);
 704         rcode = SSL_write(sock->ssn->ssl, request->proxy->data,
 705                           request->proxy->data_len);
 706         if (rcode < 0) {
 707                 int err;
 708
 709                 err = ERR_get_error();
 710                 switch (err) {
 711                 case SSL_ERROR_NONE:
 712                 case SSL_ERROR_WANT_READ:
 713                 case SSL_ERROR_WANT_WRITE:
 714                         break;  /* let someone else retry */
 715
 716                 default:
 717                         DEBUG("proxy SSL_write says %s",
 718                               ERR_error_string(err, NULL));
 719                         DEBUG("Closing TLS socket to home server");
 720                         tls_socket_close(listener);
 721                         PTHREAD_MUTEX_UNLOCK(&sock->mutex);
 722                         return 0;
 723                 }
 724         }
 725         PTHREAD_MUTEX_UNLOCK(&sock->mutex);
 726
 727         return 1;
 728 }
 729 #endif  /* WITH_PROXY */
 730
 731 #endif  /* WITH_TLS */