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         {
  77         SSL *ssl; /* The ssl handle :-) */
  78         /* re-negotiate every time the total number of bytes is this size */
  79         int num_renegotiates;
  80         unsigned long renegotiate_count;
  81         unsigned long byte_count;
  82         unsigned long renegotiate_timeout;
  83         unsigned long last_time;
  84         } BIO_SSL;
  85
  86 static BIO_METHOD methods_sslp=
  87         {
  88         BIO_TYPE_SSL,"ssl",
  89         ssl_write,
  90         ssl_read,
  91         ssl_puts,
  92         NULL, /* ssl_gets, */
  93         ssl_ctrl,
  94         ssl_new,
  95         ssl_free,
  96         ssl_callback_ctrl,
  97         };
  98
  99 BIO_METHOD *BIO_f_ssl(void)
 100         {
 101         return(&methods_sslp);
 102         }
 103
 104 static int ssl_new(BIO *bi)
 105         {
 106         BIO_SSL *bs;
 107
 108         bs=(BIO_SSL *)OPENSSL_malloc(sizeof(BIO_SSL));
 109         if (bs == NULL)
 110                 {
 111                 BIOerr(BIO_F_SSL_NEW,ERR_R_MALLOC_FAILURE);
 112                 return(0);
 113                 }
 114         memset(bs,0,sizeof(BIO_SSL));
 115         bi->init=0;
 116         bi->ptr=(char *)bs;
 117         bi->flags=0;
 118         return(1);
 119         }
 120
 121 static int ssl_free(BIO *a)
 122         {
 123         BIO_SSL *bs;
 124
 125         if (a == NULL) return(0);
 126         bs=(BIO_SSL *)a->ptr;
 127         if (bs->ssl != NULL) SSL_shutdown(bs->ssl);
 128         if (a->shutdown)
 129                 {
 130                 if (a->init && (bs->ssl != NULL))
 131                         SSL_free(bs->ssl);
 132                 a->init=0;
 133                 a->flags=0;
 134                 }
 135         if (a->ptr != NULL)
 136                 OPENSSL_free(a->ptr);
 137         return(1);
 138         }
 139
 140 static int ssl_read(BIO *b, char *out, int outl)
 141         {
 142         int ret=1;
 143         BIO_SSL *sb;
 144         SSL *ssl;
 145         int retry_reason=0;
 146         int r=0;
 147
 148         if (out == NULL) return(0);
 149         sb=(BIO_SSL *)b->ptr;
 150         ssl=sb->ssl;
 151
 152         BIO_clear_retry_flags(b);
 153
 154 #if 0
 155         if (!SSL_is_init_finished(ssl))
 156                 {
 157 /*              ret=SSL_do_handshake(ssl); */
 158                 if (ret > 0)
 159                         {
 160
 161                         outflags=(BIO_FLAGS_READ|BIO_FLAGS_SHOULD_RETRY);
 162                         ret= -1;
 163                         goto end;
 164                         }
 165                 }
 166 #endif
 167 /*      if (ret > 0) */
 168         ret=SSL_read(ssl,out,outl);
 169
 170         switch (SSL_get_error(ssl,ret))
 171                 {
 172         case SSL_ERROR_NONE:
 173                 if (ret <= 0) break;
 174                 if (sb->renegotiate_count > 0)
 175                         {
 176                         sb->byte_count+=ret;
 177                         if (sb->byte_count > sb->renegotiate_count)
 178                                 {
 179                                 sb->byte_count=0;
 180                                 sb->num_renegotiates++;
 181                                 SSL_renegotiate(ssl);
 182                                 r=1;
 183                                 }
 184                         }
 185                 if ((sb->renegotiate_timeout > 0) && (!r))
 186                         {
 187                         unsigned long tm;
 188
 189                         tm=(unsigned long)time(NULL);
 190                         if (tm > sb->last_time+sb->renegotiate_timeout)
 191                                 {
 192                                 sb->last_time=tm;
 193                                 sb->num_renegotiates++;
 194                                 SSL_renegotiate(ssl);
 195                                 }
 196                         }
 197
 198                 break;
 199         case SSL_ERROR_WANT_READ:
 200                 BIO_set_retry_read(b);
 201                 break;
 202         case SSL_ERROR_WANT_WRITE:
 203                 BIO_set_retry_write(b);
 204                 break;
 205         case SSL_ERROR_WANT_X509_LOOKUP:
 206                 BIO_set_retry_special(b);
 207                 retry_reason=BIO_RR_SSL_X509_LOOKUP;
 208                 break;
 209         case SSL_ERROR_WANT_ACCEPT:
 210                 BIO_set_retry_special(b);
 211                 retry_reason=BIO_RR_ACCEPT;
 212                 break;
 213         case SSL_ERROR_WANT_CONNECT:
 214                 BIO_set_retry_special(b);
 215                 retry_reason=BIO_RR_CONNECT;
 216                 break;
 217         case SSL_ERROR_SYSCALL:
 218         case SSL_ERROR_SSL:
 219         case SSL_ERROR_ZERO_RETURN:
 220         default:
 221                 break;
 222                 }
 223
 224         b->retry_reason=retry_reason;
 225         return(ret);
 226         }
 227
 228 static int ssl_write(BIO *b, const char *out, int outl)
 229         {
 230         int ret,r=0;
 231         int retry_reason=0;
 232         SSL *ssl;
 233         BIO_SSL *bs;
 234
 235         if (out == NULL) return(0);
 236         bs=(BIO_SSL *)b->ptr;
 237         ssl=bs->ssl;
 238
 239         BIO_clear_retry_flags(b);
 240
 241 /*      ret=SSL_do_handshake(ssl);
 242         if (ret > 0) */
 243         ret=SSL_write(ssl,out,outl);
 244
 245         switch (SSL_get_error(ssl,ret))
 246                 {
 247         case SSL_ERROR_NONE:
 248                 if (ret <= 0) break;
 249                 if (bs->renegotiate_count > 0)
 250                         {
 251                         bs->byte_count+=ret;
 252                         if (bs->byte_count > bs->renegotiate_count)
 253                                 {
 254                                 bs->byte_count=0;
 255                                 bs->num_renegotiates++;
 256                                 SSL_renegotiate(ssl);
 257                                 r=1;
 258                                 }
 259                         }
 260                 if ((bs->renegotiate_timeout > 0) && (!r))
 261                         {
 262                         unsigned long tm;
 263
 264                         tm=(unsigned long)time(NULL);
 265                         if (tm > bs->last_time+bs->renegotiate_timeout)
 266                                 {
 267                                 bs->last_time=tm;
 268                                 bs->num_renegotiates++;
 269                                 SSL_renegotiate(ssl);
 270                                 }
 271                         }
 272                 break;
 273         case SSL_ERROR_WANT_WRITE:
 274                 BIO_set_retry_write(b);
 275                 break;
 276         case SSL_ERROR_WANT_READ:
 277                 BIO_set_retry_read(b);
 278                 break;
 279         case SSL_ERROR_WANT_X509_LOOKUP:
 280                 BIO_set_retry_special(b);
 281                 retry_reason=BIO_RR_SSL_X509_LOOKUP;
 282                 break;
 283         case SSL_ERROR_WANT_CONNECT:
 284                 BIO_set_retry_special(b);
 285                 retry_reason=BIO_RR_CONNECT;
 286         case SSL_ERROR_SYSCALL:
 287         case SSL_ERROR_SSL:
 288         default:
 289                 break;
 290                 }
 291
 292         b->retry_reason=retry_reason;
 293         return(ret);
 294         }
 295
 296 static long ssl_ctrl(BIO *b, int cmd, long num, void *ptr)
 297         {
 298         SSL **sslp,*ssl;
 299         BIO_SSL *bs;
 300         BIO *dbio,*bio;
 301         long ret=1;
 302
 303         bs=(BIO_SSL *)b->ptr;
 304         ssl=bs->ssl;
 305         if ((ssl == NULL)  && (cmd != BIO_C_SET_SSL))
 306                 return(0);
 307         switch (cmd)
 308                 {
 309         case BIO_CTRL_RESET:
 310                 SSL_shutdown(ssl);
 311
 312                 if (ssl->handshake_func == ssl->method->ssl_connect)
 313                         SSL_set_connect_state(ssl);
 314                 else if (ssl->handshake_func == ssl->method->ssl_accept)
 315                         SSL_set_accept_state(ssl);
 316
 317                 SSL_clear(ssl);
 318
 319                 if (b->next_bio != NULL)
 320                         ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 321                 else if (ssl->rbio != NULL)
 322                         ret=BIO_ctrl(ssl->rbio,cmd,num,ptr);
 323                 else
 324                         ret=1;
 325                 break;
 326         case BIO_CTRL_INFO:
 327                 ret=0;
 328                 break;
 329         case BIO_C_SSL_MODE:
 330                 if (num) /* client mode */
 331                         SSL_set_connect_state(ssl);
 332                 else
 333                         SSL_set_accept_state(ssl);
 334                 break;
 335         case BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT:
 336                 ret=bs->renegotiate_timeout;
 337                 if (num < 60) num=5;
 338                 bs->renegotiate_timeout=(unsigned long)num;
 339                 bs->last_time=(unsigned long)time(NULL);
 340                 break;
 341         case BIO_C_SET_SSL_RENEGOTIATE_BYTES:
 342                 ret=bs->renegotiate_count;
 343                 if ((long)num >=512)
 344                         bs->renegotiate_count=(unsigned long)num;
 345                 break;
 346         case BIO_C_GET_SSL_NUM_RENEGOTIATES:
 347                 ret=bs->num_renegotiates;
 348                 break;
 349         case BIO_C_SET_SSL:
 350                 if (ssl != NULL)
 351                         ssl_free(b);
 352                 b->shutdown=(int)num;
 353                 ssl=(SSL *)ptr;
 354                 ((BIO_SSL *)b->ptr)->ssl=ssl;
 355                 bio=SSL_get_rbio(ssl);
 356                 if (bio != NULL)
 357                         {
 358                         if (b->next_bio != NULL)
 359                                 BIO_push(bio,b->next_bio);
 360                         b->next_bio=bio;
 361                         CRYPTO_add(&bio->references,1,CRYPTO_LOCK_BIO);
 362                         }
 363                 b->init=1;
 364                 break;
 365         case BIO_C_GET_SSL:
 366                 if (ptr != NULL)
 367                         {
 368                         sslp=(SSL **)ptr;
 369                         *sslp=ssl;
 370                         }
 371                 else
 372                         ret=0;
 373                 break;
 374         case BIO_CTRL_GET_CLOSE:
 375                 ret=b->shutdown;
 376                 break;
 377         case BIO_CTRL_SET_CLOSE:
 378                 b->shutdown=(int)num;
 379                 break;
 380         case BIO_CTRL_WPENDING:
 381                 ret=BIO_ctrl(ssl->wbio,cmd,num,ptr);
 382                 break;
 383         case BIO_CTRL_PENDING:
 384                 ret=SSL_pending(ssl);
 385                 if (ret == 0)
 386                         ret=BIO_pending(ssl->rbio);
 387                 break;
 388         case BIO_CTRL_FLUSH:
 389                 BIO_clear_retry_flags(b);
 390                 ret=BIO_ctrl(ssl->wbio,cmd,num,ptr);
 391                 BIO_copy_next_retry(b);
 392                 break;
 393         case BIO_CTRL_PUSH:
 394                 if ((b->next_bio != NULL) && (b->next_bio != ssl->rbio))
 395                         {
 396                         SSL_set_bio(ssl,b->next_bio,b->next_bio);
 397                         CRYPTO_add(&b->next_bio->references,1,CRYPTO_LOCK_BIO);
 398                         }
 399                 break;
 400         case BIO_CTRL_POP:
 401                 /* Only detach if we are the BIO explicitly being popped */
 402                 if (b == ptr)
 403                         {
 404                         /* Shouldn't happen in practice because the
 405                          * rbio and wbio are the same when pushed.
 406                          */
 407                         if (ssl->rbio != ssl->wbio)
 408                                 BIO_free_all(ssl->wbio);
 409                         if (b->next_bio != NULL)
 410                                 CRYPTO_add(&b->next_bio->references,-1,CRYPTO_LOCK_BIO);
 411                         ssl->wbio=NULL;
 412                         ssl->rbio=NULL;
 413                         }
 414                 break;
 415         case BIO_C_DO_STATE_MACHINE:
 416                 BIO_clear_retry_flags(b);
 417
 418                 b->retry_reason=0;
 419                 ret=(int)SSL_do_handshake(ssl);
 420
 421                 switch (SSL_get_error(ssl,(int)ret))
 422                         {
 423                 case SSL_ERROR_WANT_READ:
 424                         BIO_set_flags(b,
 425                                 BIO_FLAGS_READ|BIO_FLAGS_SHOULD_RETRY);
 426                         break;
 427                 case SSL_ERROR_WANT_WRITE:
 428                         BIO_set_flags(b,
 429                                 BIO_FLAGS_WRITE|BIO_FLAGS_SHOULD_RETRY);
 430                         break;
 431                 case SSL_ERROR_WANT_CONNECT:
 432                         BIO_set_flags(b,
 433                                 BIO_FLAGS_IO_SPECIAL|BIO_FLAGS_SHOULD_RETRY);
 434                         b->retry_reason=b->next_bio->retry_reason;
 435                         break;
 436                 default:
 437                         break;
 438                         }
 439                 break;
 440         case BIO_CTRL_DUP:
 441                 dbio=(BIO *)ptr;
 442                 if (((BIO_SSL *)dbio->ptr)->ssl != NULL)
 443                         SSL_free(((BIO_SSL *)dbio->ptr)->ssl);
 444                 ((BIO_SSL *)dbio->ptr)->ssl=SSL_dup(ssl);
 445                 ((BIO_SSL *)dbio->ptr)->renegotiate_count=
 446                         ((BIO_SSL *)b->ptr)->renegotiate_count;
 447                 ((BIO_SSL *)dbio->ptr)->byte_count=
 448                         ((BIO_SSL *)b->ptr)->byte_count;
 449                 ((BIO_SSL *)dbio->ptr)->renegotiate_timeout=
 450                         ((BIO_SSL *)b->ptr)->renegotiate_timeout;
 451                 ((BIO_SSL *)dbio->ptr)->last_time=
 452                         ((BIO_SSL *)b->ptr)->last_time;
 453                 ret=(((BIO_SSL *)dbio->ptr)->ssl != NULL);
 454                 break;
 455         case BIO_C_GET_FD:
 456                 ret=BIO_ctrl(ssl->rbio,cmd,num,ptr);
 457                 break;
 458         case BIO_CTRL_SET_CALLBACK:
 459                 {
 460 #if 0 /* FIXME: Should this be used?  -- Richard Levitte */
 461                 SSLerr(SSL_F_SSL_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 462                 ret = -1;
 463 #else
 464                 ret=0;
 465 #endif
 466                 }
 467                 break;
 468         case BIO_CTRL_GET_CALLBACK:
 469                 {
 470                 void (**fptr)(const SSL *xssl,int type,int val);
 471
 472                 fptr=(void (**)(const SSL *xssl,int type,int val))ptr;
 473                 *fptr=SSL_get_info_callback(ssl);
 474                 }
 475                 break;
 476         default:
 477                 ret=BIO_ctrl(ssl->rbio,cmd,num,ptr);
 478                 break;
 479                 }
 480         return(ret);
 481         }
 482
 483 static long ssl_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 484         {
 485         SSL *ssl;
 486         BIO_SSL *bs;
 487         long ret=1;
 488
 489         bs=(BIO_SSL *)b->ptr;
 490         ssl=bs->ssl;
 491         switch (cmd)
 492                 {
 493         case BIO_CTRL_SET_CALLBACK:
 494                 {
 495                 /* FIXME: setting this via a completely different prototype
 496                    seems like a crap idea */
 497                 SSL_set_info_callback(ssl,(void (*)(const SSL *,int,int))fp);
 498                 }
 499                 break;
 500         default:
 501                 ret=BIO_callback_ctrl(ssl->rbio,cmd,fp);
 502                 break;
 503                 }
 504         return(ret);
 505         }
 506
 507 static int ssl_puts(BIO *bp, const char *str)
 508         {
 509         int n,ret;
 510
 511         n=strlen(str);
 512         ret=BIO_write(bp,str,n);
 513         return(ret);
 514         }
 515
 516 BIO *BIO_new_buffer_ssl_connect(SSL_CTX *ctx)
 517         {
 518 #ifndef OPENSSL_NO_SOCK
 519         BIO *ret=NULL,*buf=NULL,*ssl=NULL;
 520
 521         if ((buf=BIO_new(BIO_f_buffer())) == NULL)
 522                 return(NULL);
 523         if ((ssl=BIO_new_ssl_connect(ctx)) == NULL)
 524                 goto err;
 525         if ((ret=BIO_push(buf,ssl)) == NULL)
 526                 goto err;
 527         return(ret);
 528 err:
 529         if (buf != NULL) BIO_free(buf);
 530         if (ssl != NULL) BIO_free(ssl);
 531 #endif
 532         return(NULL);
 533         }
 534
 535 BIO *BIO_new_ssl_connect(SSL_CTX *ctx)
 536         {
 537         BIO *ret=NULL,*con=NULL,*ssl=NULL;
 538
 539         if ((con=BIO_new(BIO_s_connect())) == NULL)
 540                 return(NULL);
 541         if ((ssl=BIO_new_ssl(ctx,1)) == NULL)
 542                 goto err;
 543         if ((ret=BIO_push(ssl,con)) == NULL)
 544                 goto err;
 545         return(ret);
 546 err:
 547         if (con != NULL) BIO_free(con);
 548         return(NULL);
 549         }
 550
 551 BIO *BIO_new_ssl(SSL_CTX *ctx, int client)
 552         {
 553         BIO *ret;
 554         SSL *ssl;
 555
 556         if ((ret=BIO_new(BIO_f_ssl())) == NULL)
 557                 return(NULL);
 558         if ((ssl=SSL_new(ctx)) == NULL)
 559                 {
 560                 BIO_free(ret);
 561                 return(NULL);
 562                 }
 563         if (client)
 564                 SSL_set_connect_state(ssl);
 565         else
 566                 SSL_set_accept_state(ssl);
 567
 568         BIO_set_ssl(ret,ssl,BIO_CLOSE);
 569         return(ret);
 570         }
 571
 572 int BIO_ssl_copy_session_id(BIO *t, BIO *f)
 573         {
 574         t=BIO_find_type(t,BIO_TYPE_SSL);
 575         f=BIO_find_type(f,BIO_TYPE_SSL);
 576         if ((t == NULL) || (f == NULL))
 577                 return(0);
 578         if (    (((BIO_SSL *)t->ptr)->ssl == NULL) ||
 579                 (((BIO_SSL *)f->ptr)->ssl == NULL))
 580                 return(0);
 581         SSL_copy_session_id(((BIO_SSL *)t->ptr)->ssl,((BIO_SSL *)f->ptr)->ssl);
 582         return(1);
 583         }
 584
 585 void BIO_ssl_shutdown(BIO *b)
 586         {
 587         SSL *s;
 588
 589         while (b != NULL)
 590                 {
 591                 if (b->method->type == BIO_TYPE_SSL)
 592                         {
 593                         s=((BIO_SSL *)b->ptr)->ssl;
 594                         SSL_shutdown(s);
 595                         break;
 596                         }
 597                 b=b->next_bio;
 598                 }
 599         }