crypto/external/bsd/openssl/dist/ssl/bio_ssl.c

   1 /* ssl/bio_ssl.c */
   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 <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include <errno.h>
  63 #include <openssl/crypto.h>
  64 #include <openssl/bio.h>
  65 #include <openssl/err.h>
  66 #include <openssl/ssl.h>
  67
  68 static int ssl_write(BIO *h, const char *buf, int num);
  69 static int ssl_read(BIO *h, char *buf, int size);
  70 static int ssl_puts(BIO *h, const char *str);
  71 static long ssl_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  72 static int ssl_new(BIO *h);
  73 static int ssl_free(BIO *data);
  74 static long ssl_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
  75 typedef struct bio_ssl_st {
  76     SSL *ssl;                   /* The ssl handle :-) */
  77     /* re-negotiate every time the total number of bytes is this size */
  78     int num_renegotiates;
  79     unsigned long renegotiate_count;
  80     unsigned long byte_count;
  81     unsigned long renegotiate_timeout;
  82     unsigned long last_time;
  83 } BIO_SSL;
  84
  85 static BIO_METHOD methods_sslp = {
  86     BIO_TYPE_SSL, "ssl",
  87     ssl_write,
  88     ssl_read,
  89     ssl_puts,
  90     NULL,                       /* ssl_gets, */
  91     ssl_ctrl,
  92     ssl_new,
  93     ssl_free,
  94     ssl_callback_ctrl,
  95 };
  96
  97 BIO_METHOD *BIO_f_ssl(void)
  98 {
  99     return (&methods_sslp);
 100 }
 101
 102 static int ssl_new(BIO *bi)
 103 {
 104     BIO_SSL *bs;
 105
 106     bs = (BIO_SSL *)OPENSSL_malloc(sizeof(BIO_SSL));
 107     if (bs == NULL) {
 108         BIOerr(BIO_F_SSL_NEW, ERR_R_MALLOC_FAILURE);
 109         return (0);
 110     }
 111     memset(bs, 0, sizeof(BIO_SSL));
 112     bi->init = 0;
 113     bi->ptr = (char *)bs;
 114     bi->flags = 0;
 115     return (1);
 116 }
 117
 118 static int ssl_free(BIO *a)
 119 {
 120     BIO_SSL *bs;
 121
 122     if (a == NULL)
 123         return (0);
 124     bs = (BIO_SSL *)a->ptr;
 125     if (bs->ssl != NULL)
 126         SSL_shutdown(bs->ssl);
 127     if (a->shutdown) {
 128         if (a->init && (bs->ssl != NULL))
 129             SSL_free(bs->ssl);
 130         a->init = 0;
 131         a->flags = 0;
 132     }
 133     if (a->ptr != NULL)
 134         OPENSSL_free(a->ptr);
 135     return (1);
 136 }
 137
 138 static int ssl_read(BIO *b, char *out, int outl)
 139 {
 140     int ret = 1;
 141     BIO_SSL *sb;
 142     SSL *ssl;
 143     int retry_reason = 0;
 144     int r = 0;
 145
 146     if (out == NULL)
 147         return (0);
 148     sb = (BIO_SSL *)b->ptr;
 149     ssl = sb->ssl;
 150
 151     BIO_clear_retry_flags(b);
 152
 153 #if 0
 154     if (!SSL_is_init_finished(ssl)) {
 155 /*              ret=SSL_do_handshake(ssl); */
 156         if (ret > 0) {
 157
 158             outflags = (BIO_FLAGS_READ | BIO_FLAGS_SHOULD_RETRY);
 159             ret = -1;
 160             goto end;
 161         }
 162     }
 163 #endif
 164 /*      if (ret > 0) */
 165     ret = SSL_read(ssl, out, outl);
 166
 167     switch (SSL_get_error(ssl, ret)) {
 168     case SSL_ERROR_NONE:
 169         if (ret <= 0)
 170             break;
 171         if (sb->renegotiate_count > 0) {
 172             sb->byte_count += ret;
 173             if (sb->byte_count > sb->renegotiate_count) {
 174                 sb->byte_count = 0;
 175                 sb->num_renegotiates++;
 176                 SSL_renegotiate(ssl);
 177                 r = 1;
 178             }
 179         }
 180         if ((sb->renegotiate_timeout > 0) && (!r)) {
 181             unsigned long tm;
 182
 183             tm = (unsigned long)time(NULL);
 184             if (tm > sb->last_time + sb->renegotiate_timeout) {
 185                 sb->last_time = tm;
 186                 sb->num_renegotiates++;
 187                 SSL_renegotiate(ssl);
 188             }
 189         }
 190
 191         break;
 192     case SSL_ERROR_WANT_READ:
 193         BIO_set_retry_read(b);
 194         break;
 195     case SSL_ERROR_WANT_WRITE:
 196         BIO_set_retry_write(b);
 197         break;
 198     case SSL_ERROR_WANT_X509_LOOKUP:
 199         BIO_set_retry_special(b);
 200         retry_reason = BIO_RR_SSL_X509_LOOKUP;
 201         break;
 202     case SSL_ERROR_WANT_ACCEPT:
 203         BIO_set_retry_special(b);
 204         retry_reason = BIO_RR_ACCEPT;
 205         break;
 206     case SSL_ERROR_WANT_CONNECT:
 207         BIO_set_retry_special(b);
 208         retry_reason = BIO_RR_CONNECT;
 209         break;
 210     case SSL_ERROR_SYSCALL:
 211     case SSL_ERROR_SSL:
 212     case SSL_ERROR_ZERO_RETURN:
 213     default:
 214         break;
 215     }
 216
 217     b->retry_reason = retry_reason;
 218     return (ret);
 219 }
 220
 221 static int ssl_write(BIO *b, const char *out, int outl)
 222 {
 223     int ret, r = 0;
 224     int retry_reason = 0;
 225     SSL *ssl;
 226     BIO_SSL *bs;
 227
 228     if (out == NULL)
 229         return (0);
 230     bs = (BIO_SSL *)b->ptr;
 231     ssl = bs->ssl;
 232
 233     BIO_clear_retry_flags(b);
 234
 235     /*
 236      * ret=SSL_do_handshake(ssl); if (ret > 0)
 237      */
 238     ret = SSL_write(ssl, out, outl);
 239
 240     switch (SSL_get_error(ssl, ret)) {
 241     case SSL_ERROR_NONE:
 242         if (ret <= 0)
 243             break;
 244         if (bs->renegotiate_count > 0) {
 245             bs->byte_count += ret;
 246             if (bs->byte_count > bs->renegotiate_count) {
 247                 bs->byte_count = 0;
 248                 bs->num_renegotiates++;
 249                 SSL_renegotiate(ssl);
 250                 r = 1;
 251             }
 252         }
 253         if ((bs->renegotiate_timeout > 0) && (!r)) {
 254             unsigned long tm;
 255
 256             tm = (unsigned long)time(NULL);
 257             if (tm > bs->last_time + bs->renegotiate_timeout) {
 258                 bs->last_time = tm;
 259                 bs->num_renegotiates++;
 260                 SSL_renegotiate(ssl);
 261             }
 262         }
 263         break;
 264     case SSL_ERROR_WANT_WRITE:
 265         BIO_set_retry_write(b);
 266         break;
 267     case SSL_ERROR_WANT_READ:
 268         BIO_set_retry_read(b);
 269         break;
 270     case SSL_ERROR_WANT_X509_LOOKUP:
 271         BIO_set_retry_special(b);
 272         retry_reason = BIO_RR_SSL_X509_LOOKUP;
 273         break;
 274     case SSL_ERROR_WANT_CONNECT:
 275         BIO_set_retry_special(b);
 276         retry_reason = BIO_RR_CONNECT;
 277     case SSL_ERROR_SYSCALL:
 278     case SSL_ERROR_SSL:
 279     default:
 280         break;
 281     }
 282
 283     b->retry_reason = retry_reason;
 284     return (ret);
 285 }
 286
 287 static long ssl_ctrl(BIO *b, int cmd, long num, void *ptr)
 288 {
 289     SSL **sslp, *ssl;
 290     BIO_SSL *bs;
 291     BIO *dbio, *bio;
 292     long ret = 1;
 293
 294     bs = (BIO_SSL *)b->ptr;
 295     ssl = bs->ssl;
 296     if ((ssl == NULL) && (cmd != BIO_C_SET_SSL))
 297         return (0);
 298     switch (cmd) {
 299     case BIO_CTRL_RESET:
 300         SSL_shutdown(ssl);
 301
 302         if (ssl->handshake_func == ssl->method->ssl_connect)
 303             SSL_set_connect_state(ssl);
 304         else if (ssl->handshake_func == ssl->method->ssl_accept)
 305             SSL_set_accept_state(ssl);
 306
 307         SSL_clear(ssl);
 308
 309         if (b->next_bio != NULL)
 310             ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 311         else if (ssl->rbio != NULL)
 312             ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);
 313         else
 314             ret = 1;
 315         break;
 316     case BIO_CTRL_INFO:
 317         ret = 0;
 318         break;
 319     case BIO_C_SSL_MODE:
 320         if (num)                /* client mode */
 321             SSL_set_connect_state(ssl);
 322         else
 323             SSL_set_accept_state(ssl);
 324         break;
 325     case BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT:
 326         ret = bs->renegotiate_timeout;
 327         if (num < 60)
 328             num = 5;
 329         bs->renegotiate_timeout = (unsigned long)num;
 330         bs->last_time = (unsigned long)time(NULL);
 331         break;
 332     case BIO_C_SET_SSL_RENEGOTIATE_BYTES:
 333         ret = bs->renegotiate_count;
 334         if ((long)num >= 512)
 335             bs->renegotiate_count = (unsigned long)num;
 336         break;
 337     case BIO_C_GET_SSL_NUM_RENEGOTIATES:
 338         ret = bs->num_renegotiates;
 339         break;
 340     case BIO_C_SET_SSL:
 341         if (ssl != NULL) {
 342             ssl_free(b);
 343             if (!ssl_new(b))
 344                 return 0;
 345         }
 346         b->shutdown = (int)num;
 347         ssl = (SSL *)ptr;
 348         ((BIO_SSL *)b->ptr)->ssl = ssl;
 349         bio = SSL_get_rbio(ssl);
 350         if (bio != NULL) {
 351             if (b->next_bio != NULL)
 352                 BIO_push(bio, b->next_bio);
 353             b->next_bio = bio;
 354             CRYPTO_add(&bio->references, 1, CRYPTO_LOCK_BIO);
 355         }
 356         b->init = 1;
 357         break;
 358     case BIO_C_GET_SSL:
 359         if (ptr != NULL) {
 360             sslp = (SSL **)ptr;
 361             *sslp = ssl;
 362         } else
 363             ret = 0;
 364         break;
 365     case BIO_CTRL_GET_CLOSE:
 366         ret = b->shutdown;
 367         break;
 368     case BIO_CTRL_SET_CLOSE:
 369         b->shutdown = (int)num;
 370         break;
 371     case BIO_CTRL_WPENDING:
 372         ret = BIO_ctrl(ssl->wbio, cmd, num, ptr);
 373         break;
 374     case BIO_CTRL_PENDING:
 375         ret = SSL_pending(ssl);
 376         if (ret == 0)
 377             ret = BIO_pending(ssl->rbio);
 378         break;
 379     case BIO_CTRL_FLUSH:
 380         BIO_clear_retry_flags(b);
 381         ret = BIO_ctrl(ssl->wbio, cmd, num, ptr);
 382         BIO_copy_next_retry(b);
 383         break;
 384     case BIO_CTRL_PUSH:
 385         if ((b->next_bio != NULL) && (b->next_bio != ssl->rbio)) {
 386             SSL_set_bio(ssl, b->next_bio, b->next_bio);
 387             CRYPTO_add(&b->next_bio->references, 1, CRYPTO_LOCK_BIO);
 388         }
 389         break;
 390     case BIO_CTRL_POP:
 391         /* Only detach if we are the BIO explicitly being popped */
 392         if (b == ptr) {
 393             /*
 394              * Shouldn't happen in practice because the rbio and wbio are the
 395              * same when pushed.
 396              */
 397             if (ssl->rbio != ssl->wbio)
 398                 BIO_free_all(ssl->wbio);
 399             if (b->next_bio != NULL)
 400                 CRYPTO_add(&b->next_bio->references, -1, CRYPTO_LOCK_BIO);
 401             ssl->wbio = NULL;
 402             ssl->rbio = NULL;
 403         }
 404         break;
 405     case BIO_C_DO_STATE_MACHINE:
 406         BIO_clear_retry_flags(b);
 407
 408         b->retry_reason = 0;
 409         ret = (int)SSL_do_handshake(ssl);
 410
 411         switch (SSL_get_error(ssl, (int)ret)) {
 412         case SSL_ERROR_WANT_READ:
 413             BIO_set_flags(b, BIO_FLAGS_READ | BIO_FLAGS_SHOULD_RETRY);
 414             break;
 415         case SSL_ERROR_WANT_WRITE:
 416             BIO_set_flags(b, BIO_FLAGS_WRITE | BIO_FLAGS_SHOULD_RETRY);
 417             break;
 418         case SSL_ERROR_WANT_CONNECT:
 419             BIO_set_flags(b, BIO_FLAGS_IO_SPECIAL | BIO_FLAGS_SHOULD_RETRY);
 420             b->retry_reason = b->next_bio->retry_reason;
 421             break;
 422         default:
 423             break;
 424         }
 425         break;
 426     case BIO_CTRL_DUP:
 427         dbio = (BIO *)ptr;
 428         if (((BIO_SSL *)dbio->ptr)->ssl != NULL)
 429             SSL_free(((BIO_SSL *)dbio->ptr)->ssl);
 430         ((BIO_SSL *)dbio->ptr)->ssl = SSL_dup(ssl);
 431         ((BIO_SSL *)dbio->ptr)->renegotiate_count =
 432             ((BIO_SSL *)b->ptr)->renegotiate_count;
 433         ((BIO_SSL *)dbio->ptr)->byte_count = ((BIO_SSL *)b->ptr)->byte_count;
 434         ((BIO_SSL *)dbio->ptr)->renegotiate_timeout =
 435             ((BIO_SSL *)b->ptr)->renegotiate_timeout;
 436         ((BIO_SSL *)dbio->ptr)->last_time = ((BIO_SSL *)b->ptr)->last_time;
 437         ret = (((BIO_SSL *)dbio->ptr)->ssl != NULL);
 438         break;
 439     case BIO_C_GET_FD:
 440         ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);
 441         break;
 442     case BIO_CTRL_SET_CALLBACK:
 443         {
 444 #if 0                           /* FIXME: Should this be used? -- Richard
 445                                  * Levitte */
 446             SSLerr(SSL_F_SSL_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 447             ret = -1;
 448 #else
 449             ret = 0;
 450 #endif
 451         }
 452         break;
 453     case BIO_CTRL_GET_CALLBACK:
 454         {
 455             void (**fptr) (const SSL *xssl, int type, int val);
 456
 457             fptr = (void (**)(const SSL *xssl, int type, int val))ptr;
 458             *fptr = SSL_get_info_callback(ssl);
 459         }
 460         break;
 461     default:
 462         ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);
 463         break;
 464     }
 465     return (ret);
 466 }
 467
 468 static long ssl_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 469 {
 470     SSL *ssl;
 471     BIO_SSL *bs;
 472     long ret = 1;
 473
 474     bs = (BIO_SSL *)b->ptr;
 475     ssl = bs->ssl;
 476     switch (cmd) {
 477     case BIO_CTRL_SET_CALLBACK:
 478         {
 479             /*
 480              * FIXME: setting this via a completely different prototype seems
 481              * like a crap idea
 482              */
 483             SSL_set_info_callback(ssl, (void (*)(const SSL *, int, int))fp);
 484         }
 485         break;
 486     default:
 487         ret = BIO_callback_ctrl(ssl->rbio, cmd, fp);
 488         break;
 489     }
 490     return (ret);
 491 }
 492
 493 static int ssl_puts(BIO *bp, const char *str)
 494 {
 495     int n, ret;
 496
 497     n = strlen(str);
 498     ret = BIO_write(bp, str, n);
 499     return (ret);
 500 }
 501
 502 BIO *BIO_new_buffer_ssl_connect(SSL_CTX *ctx)
 503 {
 504 #ifndef OPENSSL_NO_SOCK
 505     BIO *ret = NULL, *buf = NULL, *ssl = NULL;
 506
 507     if ((buf = BIO_new(BIO_f_buffer())) == NULL)
 508         return (NULL);
 509     if ((ssl = BIO_new_ssl_connect(ctx)) == NULL)
 510         goto err;
 511     if ((ret = BIO_push(buf, ssl)) == NULL)
 512         goto err;
 513     return (ret);
 514  err:
 515     if (buf != NULL)
 516         BIO_free(buf);
 517     if (ssl != NULL)
 518         BIO_free(ssl);
 519 #endif
 520     return (NULL);
 521 }
 522
 523 BIO *BIO_new_ssl_connect(SSL_CTX *ctx)
 524 {
 525 #ifndef OPENSSL_NO_SOCK
 526     BIO *ret = NULL, *con = NULL, *ssl = NULL;
 527
 528     if ((con = BIO_new(BIO_s_connect())) == NULL)
 529         return (NULL);
 530     if ((ssl = BIO_new_ssl(ctx, 1)) == NULL)
 531         goto err;
 532     if ((ret = BIO_push(ssl, con)) == NULL)
 533         goto err;
 534     return (ret);
 535  err:
 536     if (con != NULL)
 537         BIO_free(con);
 538 #endif
 539     return (NULL);
 540 }
 541
 542 BIO *BIO_new_ssl(SSL_CTX *ctx, int client)
 543 {
 544     BIO *ret;
 545     SSL *ssl;
 546
 547     if ((ret = BIO_new(BIO_f_ssl())) == NULL)
 548         return (NULL);
 549     if ((ssl = SSL_new(ctx)) == NULL) {
 550         BIO_free(ret);
 551         return (NULL);
 552     }
 553     if (client)
 554         SSL_set_connect_state(ssl);
 555     else
 556         SSL_set_accept_state(ssl);
 557
 558     BIO_set_ssl(ret, ssl, BIO_CLOSE);
 559     return (ret);
 560 }
 561
 562 int BIO_ssl_copy_session_id(BIO *t, BIO *f)
 563 {
 564     t = BIO_find_type(t, BIO_TYPE_SSL);
 565     f = BIO_find_type(f, BIO_TYPE_SSL);
 566     if ((t == NULL) || (f == NULL))
 567         return (0);
 568     if ((((BIO_SSL *)t->ptr)->ssl == NULL) ||
 569         (((BIO_SSL *)f->ptr)->ssl == NULL))
 570         return (0);
 571     SSL_copy_session_id(((BIO_SSL *)t->ptr)->ssl, ((BIO_SSL *)f->ptr)->ssl);
 572     return (1);
 573 }
 574
 575 void BIO_ssl_shutdown(BIO *b)
 576 {
 577     SSL *s;
 578
 579     while (b != NULL) {
 580         if (b->method->type == BIO_TYPE_SSL) {
 581             s = ((BIO_SSL *)b->ptr)->ssl;
 582             SSL_shutdown(s);
 583             break;
 584         }
 585         b = b->next_bio;
 586     }
 587 }