lib/libcrypto/bio/bss_conn.c

   1 /* $OpenBSD: bss_conn.c,v 1.35 2018/05/12 18:51:59 tb Exp $ */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <sys/socket.h>
  60
  61 #include <netinet/in.h>
  62
  63 #include <errno.h>
  64 #include <netdb.h>
  65 #include <stdio.h>
  66 #include <string.h>
  67 #include <unistd.h>
  68
  69 #include <openssl/bio.h>
  70 #include <openssl/buffer.h>
  71 #include <openssl/err.h>
  72
  73 #define SOCKET_PROTOCOL IPPROTO_TCP
  74
  75 typedef struct bio_connect_st {
  76         int state;
  77
  78         char *param_hostname;
  79         char *param_port;
  80         int nbio;
  81
  82         unsigned char ip[4];
  83         unsigned short port;
  84
  85         struct sockaddr_in them;
  86
  87         /* int socket; this will be kept in bio->num so that it is
  88          * compatible with the bss_sock bio */
  89
  90         /* called when the connection is initially made
  91          *  callback(BIO,state,ret);  The callback should return
  92          * 'ret'.  state is for compatibility with the ssl info_callback */
  93         int (*info_callback)(const BIO *bio, int state, int ret);
  94 } BIO_CONNECT;
  95
  96 static int conn_write(BIO *h, const char *buf, int num);
  97 static int conn_read(BIO *h, char *buf, int size);
  98 static int conn_puts(BIO *h, const char *str);
  99 static long conn_ctrl(BIO *h, int cmd, long arg1, void *arg2);
 100 static int conn_new(BIO *h);
 101 static int conn_free(BIO *data);
 102 static long conn_callback_ctrl(BIO *h, int cmd, bio_info_cb *);
 103
 104 static int conn_state(BIO *b, BIO_CONNECT *c);
 105 static void conn_close_socket(BIO *data);
 106 BIO_CONNECT *BIO_CONNECT_new(void);
 107 void BIO_CONNECT_free(BIO_CONNECT *a);
 108
 109 static const BIO_METHOD methods_connectp = {
 110         .type = BIO_TYPE_CONNECT,
 111         .name = "socket connect",
 112         .bwrite = conn_write,
 113         .bread = conn_read,
 114         .bputs = conn_puts,
 115         .ctrl = conn_ctrl,
 116         .create = conn_new,
 117         .destroy = conn_free,
 118         .callback_ctrl = conn_callback_ctrl
 119 };
 120
 121 static int
 122 conn_state(BIO *b, BIO_CONNECT *c)
 123 {
 124         int ret = -1, i;
 125         unsigned long l;
 126         char *p, *q;
 127         int (*cb)(const BIO *, int, int) = NULL;
 128
 129         if (c->info_callback != NULL)
 130                 cb = c->info_callback;
 131
 132         for (;;) {
 133                 switch (c->state) {
 134                 case BIO_CONN_S_BEFORE:
 135                         p = c->param_hostname;
 136                         if (p == NULL) {
 137                                 BIOerror(BIO_R_NO_HOSTNAME_SPECIFIED);
 138                                 goto exit_loop;
 139                         }
 140                         for (; *p != '\0'; p++) {
 141                                 if ((*p == ':') || (*p == '/'))
 142                                 break;
 143                         }
 144
 145                         i= *p;
 146                         if ((i == ':') || (i == '/')) {
 147                                 *(p++) = '\0';
 148                                 if (i == ':') {
 149                                         for (q = p; *q; q++)
 150                                                 if (*q == '/') {
 151                                                         *q = '\0';
 152                                                         break;
 153                                                 }
 154                                         free(c->param_port);
 155                                         c->param_port = strdup(p);
 156                                 }
 157                         }
 158
 159                         if (c->param_port == NULL) {
 160                                 BIOerror(BIO_R_NO_PORT_SPECIFIED);
 161                                 ERR_asprintf_error_data("host=%s",
 162                                     c->param_hostname);
 163                                 goto exit_loop;
 164                         }
 165                         c->state = BIO_CONN_S_GET_IP;
 166                         break;
 167
 168                 case BIO_CONN_S_GET_IP:
 169                         if (BIO_get_host_ip(c->param_hostname, &(c->ip[0])) <= 0)
 170                                 goto exit_loop;
 171                         c->state = BIO_CONN_S_GET_PORT;
 172                         break;
 173
 174                 case BIO_CONN_S_GET_PORT:
 175                         if (c->param_port == NULL) {
 176                                 /* abort(); */
 177                                 goto exit_loop;
 178                         } else if (BIO_get_port(c->param_port, &c->port) <= 0)
 179                                 goto exit_loop;
 180                         c->state = BIO_CONN_S_CREATE_SOCKET;
 181                         break;
 182
 183                 case BIO_CONN_S_CREATE_SOCKET:
 184                         /* now setup address */
 185                         memset((char *)&c->them, 0, sizeof(c->them));
 186                         c->them.sin_family = AF_INET;
 187                         c->them.sin_port = htons((unsigned short)c->port);
 188                         l = (unsigned long)
 189                             ((unsigned long)c->ip[0] << 24L)|
 190                             ((unsigned long)c->ip[1] << 16L)|
 191                             ((unsigned long)c->ip[2] << 8L)|
 192                             ((unsigned long)c->ip[3]);
 193                         c->them.sin_addr.s_addr = htonl(l);
 194                         c->state = BIO_CONN_S_CREATE_SOCKET;
 195
 196                         ret = socket(AF_INET, SOCK_STREAM, SOCKET_PROTOCOL);
 197                         if (ret == -1) {
 198                                 SYSerror(errno);
 199                                 ERR_asprintf_error_data("host=%s:%s",
 200                                     c->param_hostname, c->param_port);
 201                                 BIOerror(BIO_R_UNABLE_TO_CREATE_SOCKET);
 202                                 goto exit_loop;
 203                         }
 204                         b->num = ret;
 205                         c->state = BIO_CONN_S_NBIO;
 206                         break;
 207
 208                 case BIO_CONN_S_NBIO:
 209                         if (c->nbio) {
 210                                 if (!BIO_socket_nbio(b->num, 1)) {
 211                                         BIOerror(BIO_R_ERROR_SETTING_NBIO);
 212                                         ERR_asprintf_error_data("host=%s:%s",
 213                                             c->param_hostname, c->param_port);
 214                                         goto exit_loop;
 215                                 }
 216                         }
 217                         c->state = BIO_CONN_S_CONNECT;
 218
 219 #if defined(SO_KEEPALIVE)
 220                         i = 1;
 221                         i = setsockopt(b->num, SOL_SOCKET, SO_KEEPALIVE, &i, sizeof(i));
 222                         if (i < 0) {
 223                                 SYSerror(errno);
 224                                 ERR_asprintf_error_data("host=%s:%s",
 225                                     c->param_hostname, c->param_port);
 226                                 BIOerror(BIO_R_KEEPALIVE);
 227                                 goto exit_loop;
 228                         }
 229 #endif
 230                         break;
 231
 232                 case BIO_CONN_S_CONNECT:
 233                         BIO_clear_retry_flags(b);
 234                         ret = connect(b->num,
 235                         (struct sockaddr *)&c->them,
 236                         sizeof(c->them));
 237                         b->retry_reason = 0;
 238                         if (ret < 0) {
 239                                 if (BIO_sock_should_retry(ret)) {
 240                                         BIO_set_retry_special(b);
 241                                         c->state = BIO_CONN_S_BLOCKED_CONNECT;
 242                                         b->retry_reason = BIO_RR_CONNECT;
 243                                 } else {
 244                                         SYSerror(errno);
 245                                         ERR_asprintf_error_data("host=%s:%s",
 246                                             c->param_hostname, c->param_port);
 247                                         BIOerror(BIO_R_CONNECT_ERROR);
 248                                 }
 249                                 goto exit_loop;
 250                         } else
 251                                 c->state = BIO_CONN_S_OK;
 252                         break;
 253
 254                 case BIO_CONN_S_BLOCKED_CONNECT:
 255                         i = BIO_sock_error(b->num);
 256                         if (i) {
 257                                 BIO_clear_retry_flags(b);
 258                                 SYSerror(i);
 259                                 ERR_asprintf_error_data("host=%s:%s",
 260                                     c->param_hostname, c->param_port);
 261                                 BIOerror(BIO_R_NBIO_CONNECT_ERROR);
 262                                 ret = 0;
 263                                 goto exit_loop;
 264                         } else
 265                                 c->state = BIO_CONN_S_OK;
 266                         break;
 267
 268                 case BIO_CONN_S_OK:
 269                         ret = 1;
 270                         goto exit_loop;
 271                 default:
 272                         /* abort(); */
 273                         goto exit_loop;
 274                 }
 275
 276                 if (cb != NULL) {
 277                         if (!(ret = cb((BIO *)b, c->state, ret)))
 278                                 goto end;
 279                 }
 280         }
 281
 282         /* Loop does not exit */
 283 exit_loop:
 284         if (cb != NULL)
 285                 ret = cb((BIO *)b, c->state, ret);
 286 end:
 287         return (ret);
 288 }
 289
 290 BIO_CONNECT *
 291 BIO_CONNECT_new(void)
 292 {
 293         BIO_CONNECT *ret;
 294
 295         if ((ret = malloc(sizeof(BIO_CONNECT))) == NULL)
 296                 return (NULL);
 297         ret->state = BIO_CONN_S_BEFORE;
 298         ret->param_hostname = NULL;
 299         ret->param_port = NULL;
 300         ret->info_callback = NULL;
 301         ret->nbio = 0;
 302         ret->ip[0] = 0;
 303         ret->ip[1] = 0;
 304         ret->ip[2] = 0;
 305         ret->ip[3] = 0;
 306         ret->port = 0;
 307         memset((char *)&ret->them, 0, sizeof(ret->them));
 308         return (ret);
 309 }
 310
 311 void
 312 BIO_CONNECT_free(BIO_CONNECT *a)
 313 {
 314         if (a == NULL)
 315                 return;
 316
 317         free(a->param_hostname);
 318         free(a->param_port);
 319         free(a);
 320 }
 321
 322 const BIO_METHOD *
 323 BIO_s_connect(void)
 324 {
 325         return (&methods_connectp);
 326 }
 327
 328 static int
 329 conn_new(BIO *bi)
 330 {
 331         bi->init = 0;
 332         bi->num = -1;
 333         bi->flags = 0;
 334         if ((bi->ptr = (char *)BIO_CONNECT_new()) == NULL)
 335                 return (0);
 336         else
 337                 return (1);
 338 }
 339
 340 static void
 341 conn_close_socket(BIO *bio)
 342 {
 343         BIO_CONNECT *c;
 344
 345         c = (BIO_CONNECT *)bio->ptr;
 346         if (bio->num != -1) {
 347                 /* Only do a shutdown if things were established */
 348                 if (c->state == BIO_CONN_S_OK)
 349                         shutdown(bio->num, SHUT_RDWR);
 350                 close(bio->num);
 351                 bio->num = -1;
 352         }
 353 }
 354
 355 static int
 356 conn_free(BIO *a)
 357 {
 358         BIO_CONNECT *data;
 359
 360         if (a == NULL)
 361                 return (0);
 362         data = (BIO_CONNECT *)a->ptr;
 363
 364         if (a->shutdown) {
 365                 conn_close_socket(a);
 366                 BIO_CONNECT_free(data);
 367                 a->ptr = NULL;
 368                 a->flags = 0;
 369                 a->init = 0;
 370         }
 371         return (1);
 372 }
 373
 374 static int
 375 conn_read(BIO *b, char *out, int outl)
 376 {
 377         int ret = 0;
 378         BIO_CONNECT *data;
 379
 380         data = (BIO_CONNECT *)b->ptr;
 381         if (data->state != BIO_CONN_S_OK) {
 382                 ret = conn_state(b, data);
 383                 if (ret <= 0)
 384                         return (ret);
 385         }
 386
 387         if (out != NULL) {
 388                 errno = 0;
 389                 ret = read(b->num, out, outl);
 390                 BIO_clear_retry_flags(b);
 391                 if (ret <= 0) {
 392                         if (BIO_sock_should_retry(ret))
 393                                 BIO_set_retry_read(b);
 394                 }
 395         }
 396         return (ret);
 397 }
 398
 399 static int
 400 conn_write(BIO *b, const char *in, int inl)
 401 {
 402         int ret;
 403         BIO_CONNECT *data;
 404
 405         data = (BIO_CONNECT *)b->ptr;
 406         if (data->state != BIO_CONN_S_OK) {
 407                 ret = conn_state(b, data);
 408                 if (ret <= 0)
 409                         return (ret);
 410         }
 411
 412         errno = 0;
 413         ret = write(b->num, in, inl);
 414         BIO_clear_retry_flags(b);
 415         if (ret <= 0) {
 416                 if (BIO_sock_should_retry(ret))
 417                         BIO_set_retry_write(b);
 418         }
 419         return (ret);
 420 }
 421
 422 static long
 423 conn_ctrl(BIO *b, int cmd, long num, void *ptr)
 424 {
 425         BIO *dbio;
 426         int *ip;
 427         const char **pptr;
 428         long ret = 1;
 429         BIO_CONNECT *data;
 430
 431         data = (BIO_CONNECT *)b->ptr;
 432
 433         switch (cmd) {
 434         case BIO_CTRL_RESET:
 435                 ret = 0;
 436                 data->state = BIO_CONN_S_BEFORE;
 437                 conn_close_socket(b);
 438                 b->flags = 0;
 439                 break;
 440         case BIO_C_DO_STATE_MACHINE:
 441                 /* use this one to start the connection */
 442                 if (data->state != BIO_CONN_S_OK)
 443                         ret = (long)conn_state(b, data);
 444                 else
 445                         ret = 1;
 446                 break;
 447         case BIO_C_GET_CONNECT:
 448                 if (ptr != NULL) {
 449                         pptr = (const char **)ptr;
 450                         if (num == 0) {
 451                                 *pptr = data->param_hostname;
 452
 453                         } else if (num == 1) {
 454                                 *pptr = data->param_port;
 455                         } else if (num == 2) {
 456                                 *pptr = (char *)&(data->ip[0]);
 457                         } else if (num == 3) {
 458                                 *((int *)ptr) = data->port;
 459                         }
 460                         if ((!b->init) || (ptr == NULL))
 461                                 *pptr = "not initialized";
 462                         ret = 1;
 463                 }
 464                 break;
 465         case BIO_C_SET_CONNECT:
 466                 if (ptr != NULL) {
 467                         b->init = 1;
 468                         if (num == 0) {
 469                                 free(data->param_hostname);
 470                                 data->param_hostname = strdup(ptr);
 471                         } else if (num == 1) {
 472                                 free(data->param_port);
 473                                 data->param_port = strdup(ptr);
 474                         } else if (num == 2) {
 475                                 unsigned char *p = ptr;
 476                                 free(data->param_hostname);
 477                                 if (asprintf(&data->param_hostname,
 478                                         "%u.%u.%u.%u", p[0], p[1],
 479                                         p[2], p[3]) == -1)
 480                                         data->param_hostname = NULL;
 481                                 memcpy(&(data->ip[0]), ptr, 4);
 482                         } else if (num == 3) {
 483                                 free(data->param_port);
 484                                 data->port= *(int *)ptr;
 485                                 if (asprintf(&data->param_port, "%d",
 486                                         data->port) == -1)
 487                                         data->param_port = NULL;
 488                         }
 489                 }
 490                 break;
 491         case BIO_C_SET_NBIO:
 492                 data->nbio = (int)num;
 493                 break;
 494         case BIO_C_GET_FD:
 495                 if (b->init) {
 496                         ip = (int *)ptr;
 497                         if (ip != NULL)
 498                                 *ip = b->num;
 499                         ret = b->num;
 500                 } else
 501                         ret = -1;
 502                 break;
 503         case BIO_CTRL_GET_CLOSE:
 504                 ret = b->shutdown;
 505                 break;
 506         case BIO_CTRL_SET_CLOSE:
 507                 b->shutdown = (int)num;
 508                 break;
 509         case BIO_CTRL_PENDING:
 510         case BIO_CTRL_WPENDING:
 511                 ret = 0;
 512                 break;
 513         case BIO_CTRL_FLUSH:
 514                 break;
 515         case BIO_CTRL_DUP:
 516                 {
 517                         dbio = (BIO *)ptr;
 518                         if (data->param_port)
 519                                 BIO_set_conn_port(dbio, data->param_port);
 520                         if (data->param_hostname)
 521                                 BIO_set_conn_hostname(dbio,
 522                                     data->param_hostname);
 523                         BIO_set_nbio(dbio, data->nbio);
 524                         /* FIXME: the cast of the function seems unlikely to be a good idea */
 525                         (void)BIO_set_info_callback(dbio,
 526                             (bio_info_cb *)data->info_callback);
 527                 }
 528                 break;
 529         case BIO_CTRL_SET_CALLBACK:
 530                 {
 531 #if 0 /* FIXME: Should this be used?  -- Richard Levitte */
 532                         BIOerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 533                         ret = -1;
 534 #else
 535                         ret = 0;
 536 #endif
 537                 }
 538                 break;
 539         case BIO_CTRL_GET_CALLBACK:
 540                 {
 541                         int (**fptr)(const BIO *bio, int state, int xret);
 542
 543                         fptr = (int (**)(const BIO *bio, int state, int xret))ptr;
 544                         *fptr = data->info_callback;
 545                 }
 546                 break;
 547         default:
 548                 ret = 0;
 549                 break;
 550         }
 551         return (ret);
 552 }
 553
 554 static long
 555 conn_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 556 {
 557         long ret = 1;
 558         BIO_CONNECT *data;
 559
 560         data = (BIO_CONNECT *)b->ptr;
 561
 562         switch (cmd) {
 563         case BIO_CTRL_SET_CALLBACK:
 564                 {
 565                         data->info_callback = (int (*)(const struct bio_st *, int, int))fp;
 566                 }
 567                 break;
 568         default:
 569                 ret = 0;
 570                 break;
 571         }
 572         return (ret);
 573 }
 574
 575 static int
 576 conn_puts(BIO *bp, const char *str)
 577 {
 578         int n, ret;
 579
 580         n = strlen(str);
 581         ret = conn_write(bp, str, n);
 582         return (ret);
 583 }
 584
 585 BIO *
 586 BIO_new_connect(const char *str)
 587 {
 588         BIO *ret;
 589
 590         ret = BIO_new(BIO_s_connect());
 591         if (ret == NULL)
 592                 return (NULL);
 593         if (BIO_set_conn_hostname(ret, str))
 594                 return (ret);
 595         else {
 596                 BIO_free(ret);
 597                 return (NULL);
 598         }
 599 }
 600