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