ssl/bio_ssl.c

   1 /* ssl/bio_ssl.c */
   2 /* Copyright (C) 1995-1997 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 <string.h>
  61 #include <errno.h>
  62 #include "bio.h"
  63 #include "err.h"
  64 #include "ssl.h"
  65
  66 #ifndef NOPROTO
  67 static int ssl_write(BIO *h,char *buf,int num);
  68 static int ssl_read(BIO *h,char *buf,int size);
  69 static int ssl_puts(BIO *h,char *str);
  70 static long ssl_ctrl(BIO *h,int cmd,long arg1,char *arg2);
  71 static int ssl_new(BIO *h);
  72 static int ssl_free(BIO *data);
  73 #else
  74 static int ssl_write();
  75 static int ssl_read();
  76 static int ssl_puts();
  77 static long ssl_ctrl();
  78 static int ssl_new();
  79 static int ssl_free();
  80 #endif
  81
  82 static BIO_METHOD methods_sslp=
  83         {
  84         BIO_TYPE_SSL,"ssl",
  85         ssl_write,
  86         ssl_read,
  87         ssl_puts,
  88         NULL, /* ssl_gets, */
  89         ssl_ctrl,
  90         ssl_new,
  91         ssl_free,
  92         };
  93
  94 BIO_METHOD *BIO_f_ssl()
  95         {
  96         return(&methods_sslp);
  97         }
  98
  99 static int ssl_new(bi)
 100 BIO *bi;
 101         {
 102         bi->init=0;
 103         bi->ptr=NULL;   /* The SSL structure */
 104         bi->flags=0;
 105         return(1);
 106         }
 107
 108 static int ssl_free(a)
 109 BIO *a;
 110         {
 111         if (a == NULL) return(0);
 112         if (a->ptr != NULL) SSL_shutdown((SSL *)a->ptr);
 113         if (a->shutdown)
 114                 {
 115                 if (a->init) SSL_free((SSL *)a->ptr);
 116                 a->init=0;
 117                 a->flags=0;
 118                 a->ptr=NULL;
 119                 }
 120         return(1);
 121         }
 122
 123 static int ssl_read(b,out,outl)
 124 BIO *b;
 125 char *out;
 126 int outl;
 127         {
 128         int ret=1;
 129         int inflags,outflags;
 130         SSL *ssl;
 131         int retry_reason=0;
 132
 133         if (out == NULL) return(0);
 134         ssl=(SSL *)b->ptr;
 135
 136         inflags=outflags=b->flags;
 137
 138         outflags&= ~(BIO_FLAGS_RWS|BIO_FLAGS_SHOULD_RETRY);
 139
 140         if (!SSL_is_init_finished(ssl))
 141                 {
 142                 ret=SSL_do_handshake(ssl);
 143 #if 0
 144                 if (ret > 0)
 145                         {
 146                         outflags=(BIO_FLAGS_READ|BIO_FLAGS_SHOULD_RETRY);
 147                         ret= -1;
 148                         goto end;
 149                         }
 150 #endif
 151                 }
 152         if (ret > 0)
 153                 ret=SSL_read(ssl,out,outl);
 154
 155         switch (SSL_get_error(ssl,ret))
 156                 {
 157         case SSL_ERROR_NONE:
 158                 if (ret <= 0) break;
 159                 break;
 160         case SSL_ERROR_WANT_READ:
 161                 outflags=(BIO_FLAGS_READ|BIO_FLAGS_SHOULD_RETRY);
 162                 break;
 163         case SSL_ERROR_WANT_WRITE:
 164                 outflags=(BIO_FLAGS_WRITE|BIO_FLAGS_SHOULD_RETRY);
 165                 break;
 166         case SSL_ERROR_WANT_X509_LOOKUP:
 167                 outflags=(BIO_FLAGS_IO_SPECIAL|BIO_FLAGS_SHOULD_RETRY);
 168                 retry_reason=BIO_RR_SSL_X509_LOOKUP;
 169                 break;
 170         case SSL_ERROR_WANT_CONNECT:
 171                 outflags=(BIO_FLAGS_IO_SPECIAL|BIO_FLAGS_SHOULD_RETRY);
 172                 retry_reason=BIO_RR_CONNECT;
 173                 break;
 174         case SSL_ERROR_SYSCALL:
 175         case SSL_ERROR_SSL:
 176         case SSL_ERROR_ZERO_RETURN:
 177         default:
 178                 break;
 179                 }
 180
 181         b->retry_reason=retry_reason;
 182         b->flags=outflags;
 183         return(ret);
 184         }
 185
 186 static int ssl_write(b,out,outl)
 187 BIO *b;
 188 char *out;
 189 int outl;
 190         {
 191         int ret;
 192         int inflags,outflags,retry_reason=0;
 193         SSL *ssl;
 194
 195         if (out == NULL) return(0);
 196         ssl=(SSL *)b->ptr;
 197
 198         inflags=outflags=b->flags;
 199
 200         outflags&= ~(BIO_FLAGS_RWS|BIO_FLAGS_SHOULD_RETRY);
 201
 202         ret=SSL_do_handshake(ssl);
 203         if (ret > 0)
 204                 ret=SSL_write(ssl,out,outl);
 205
 206         switch (SSL_get_error(ssl,ret))
 207                 {
 208         case SSL_ERROR_NONE:
 209                 if (ret <= 0) break;
 210                 break;
 211         case SSL_ERROR_WANT_WRITE:
 212                 outflags=(BIO_FLAGS_WRITE|BIO_FLAGS_SHOULD_RETRY);
 213                 break;
 214         case SSL_ERROR_WANT_READ:
 215                 outflags=(BIO_FLAGS_READ|BIO_FLAGS_SHOULD_RETRY);
 216                 break;
 217         case SSL_ERROR_WANT_X509_LOOKUP:
 218                 outflags=(BIO_FLAGS_IO_SPECIAL|BIO_FLAGS_SHOULD_RETRY);
 219                 retry_reason=BIO_RR_SSL_X509_LOOKUP;
 220                 break;
 221         case SSL_ERROR_WANT_CONNECT:
 222                 outflags=(BIO_FLAGS_IO_SPECIAL|BIO_FLAGS_SHOULD_RETRY);
 223                 retry_reason=BIO_RR_CONNECT;
 224         case SSL_ERROR_SYSCALL:
 225         case SSL_ERROR_SSL:
 226         default:
 227                 break;
 228                 }
 229
 230         b->retry_reason=retry_reason;
 231         b->flags=outflags;
 232         return(ret);
 233         }
 234
 235 static long ssl_ctrl(b,cmd,num,ptr)
 236 BIO *b;
 237 int cmd;
 238 long num;
 239 char *ptr;
 240         {
 241         SSL **sslp,*ssl;
 242         BIO *dbio,*bio;
 243         long ret=1;
 244
 245         ssl=(SSL *)b->ptr;
 246         switch (cmd)
 247                 {
 248         case BIO_CTRL_RESET:
 249                 SSL_shutdown(ssl);
 250
 251                 if (ssl->handshake_func == ssl->method->ssl_connect)
 252                         SSL_set_connect_state(ssl);
 253                 else if (ssl->handshake_func == ssl->method->ssl_accept)
 254                         SSL_set_accept_state(ssl);
 255
 256                 SSL_clear(ssl);
 257
 258                 if (b->next_bio != NULL)
 259                         ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 260                 else if (ssl->rbio != NULL)
 261                         ret=BIO_ctrl(ssl->rbio,cmd,num,ptr);
 262                 else
 263                         ret=1;
 264                 break;
 265         case BIO_CTRL_EOF:
 266         case BIO_CTRL_INFO:
 267                 ret=0;
 268                 break;
 269         case BIO_C_SSL_MODE:
 270                 if (num) /* client mode */
 271                         SSL_set_connect_state(ssl);
 272                 else
 273                         SSL_set_accept_state(ssl);
 274                 break;
 275         case BIO_C_SET_SSL:
 276                 ssl_free(b);
 277                 b->shutdown=(int)num;
 278                 b->ptr=ptr;
 279                 ssl=(SSL *)ptr;
 280                 bio=SSL_get_rbio(ssl);
 281                 if (bio != NULL)
 282                         {
 283                         if (b->next_bio != NULL)
 284                                 BIO_push(bio,b->next_bio);
 285                         b->next_bio=bio;
 286                         }
 287                 b->init=1;
 288                 break;
 289         case BIO_C_GET_SSL:
 290                 if (ptr != NULL)
 291                         {
 292                         sslp=(SSL **)ptr;
 293                         *sslp=ssl;
 294                         }
 295                 break;
 296         case BIO_CTRL_GET_CLOSE:
 297                 ret=b->shutdown;
 298                 break;
 299         case BIO_CTRL_SET_CLOSE:
 300                 b->shutdown=(int)num;
 301                 break;
 302         case BIO_CTRL_WPENDING:
 303                 ret=BIO_ctrl(ssl->wbio,cmd,num,ptr);
 304                 break;
 305         case BIO_CTRL_PENDING:
 306                 ret=SSL_pending(ssl);
 307                 if (ret == 0)
 308                         ret=BIO_pending(ssl->rbio);
 309                 break;
 310         case BIO_CTRL_FLUSH:
 311                 BIO_clear_retry_flags(b);
 312                 ret=BIO_ctrl(ssl->wbio,cmd,num,ptr);
 313                 BIO_copy_next_retry(b);
 314                 break;
 315         case BIO_CTRL_PUSH:
 316                 if (b->next_bio != NULL)
 317                         {
 318                         SSL_set_bio(ssl,b->next_bio,b->next_bio);
 319                         b->next_bio->references++;
 320                         }
 321                 break;
 322         case BIO_CTRL_POP:
 323                 /* ugly bit of a hack */
 324                 if (ssl->rbio != ssl->wbio) /* we are in trouble :-( */
 325                         {
 326                         BIO_free_all(ssl->wbio);
 327                         }
 328                 ssl->wbio=NULL;
 329                 ssl->rbio=NULL;
 330                 break;
 331         case BIO_C_DO_STATE_MACHINE:
 332                 BIO_clear_retry_flags(b);
 333
 334                 b->retry_reason=0;
 335                 ret=(int)SSL_do_handshake(ssl);
 336
 337                 switch (SSL_get_error(ssl,(int)ret))
 338                         {
 339                 case SSL_ERROR_WANT_READ:
 340                         BIO_set_flags(b,
 341                                 BIO_FLAGS_READ|BIO_FLAGS_SHOULD_RETRY);
 342                         break;
 343                 case SSL_ERROR_WANT_WRITE:
 344                         BIO_set_flags(b,
 345                                 BIO_FLAGS_WRITE|BIO_FLAGS_SHOULD_RETRY);
 346                         break;
 347                 case SSL_ERROR_WANT_CONNECT:
 348                         BIO_set_flags(b,
 349                                 BIO_FLAGS_IO_SPECIAL|BIO_FLAGS_SHOULD_RETRY);
 350                         b->retry_reason=b->next_bio->retry_reason;
 351                         break;
 352                 default:
 353                         break;
 354                         }
 355                 break;
 356         case BIO_CTRL_DUP:
 357                 dbio=(BIO *)ptr;
 358                 if (dbio->ptr != NULL)
 359                         SSL_free((SSL *)dbio->ptr);
 360                 dbio->ptr=(char *)SSL_dup(ssl);
 361                 ret=(dbio->ptr != NULL);
 362                 break;
 363         default:
 364                 return(0);
 365                 break;
 366                 }
 367         return(ret);
 368         }
 369
 370 static int ssl_puts(bp,str)
 371 BIO *bp;
 372 char *str;
 373         {
 374         int n,ret;
 375
 376         n=strlen(str);
 377         ret=BIO_write(bp,str,n);
 378         return(ret);
 379         }
 380
 381 BIO *BIO_new_ssl(ctx,client)
 382 SSL_CTX *ctx;
 383 int client;
 384         {
 385         BIO *ret;
 386         SSL *ssl;
 387
 388         if ((ret=BIO_new(BIO_f_ssl())) == NULL)
 389                 return(NULL);
 390         if ((ssl=SSL_new(ctx)) == NULL)
 391                 {
 392                 BIO_free(ret);
 393                 return(NULL);
 394                 }
 395         if (client)
 396                 SSL_set_connect_state(ssl);
 397         else
 398                 SSL_set_accept_state(ssl);
 399
 400         BIO_set_ssl(ret,ssl,BIO_CLOSE);
 401         return(ret);
 402         }
 403
 404 int BIO_ssl_copy_session_id(t,f)
 405 BIO *t,*f;
 406         {
 407         t=BIO_find_type(t,BIO_TYPE_SSL);
 408         f=BIO_find_type(f,BIO_TYPE_SSL);
 409         if ((t == NULL) || (f == NULL))
 410                 return(0);
 411         if ((t->ptr == NULL) || (f->ptr == NULL))
 412                 return(0);
 413         SSL_copy_session_id((SSL *)t->ptr,(SSL *)f->ptr);
 414         return(1);
 415         }
 416
 417 void BIO_ssl_shutdown(b)
 418 BIO *b;
 419         {
 420         SSL *s;
 421
 422         while (b != NULL)
 423                 {
 424                 if (b->method->type == BIO_TYPE_SSL)
 425                         {
 426                         s=(SSL *)b->ptr;
 427                         SSL_shutdown(s);
 428                         break;
 429                         }
 430                 b=b->next_bio;
 431                 }
 432         }