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_CONNECT: 210 BIO_set_retry_special(b); 211 retry_reason=BIO_RR_CONNECT; 212 break; 213 case SSL_ERROR_SYSCALL: 214 case SSL_ERROR_SSL: 215 case SSL_ERROR_ZERO_RETURN: 216 default: 217 break; 218 } 219 220 b->retry_reason=retry_reason; 221 return(ret); 222 } 223 224 static int ssl_write(BIO *b, const char *out, int outl) 225 { 226 int ret,r=0; 227 int retry_reason=0; 228 SSL *ssl; 229 BIO_SSL *bs; 230 231 if (out == NULL) return(0); 232 bs=(BIO_SSL *)b->ptr; 233 ssl=bs->ssl; 234 235 BIO_clear_retry_flags(b); 236 237 /* ret=SSL_do_handshake(ssl); 238 if (ret > 0) */ 239 ret=SSL_write(ssl,out,outl); 240 241 switch (SSL_get_error(ssl,ret)) 242 { 243 case SSL_ERROR_NONE: 244 if (ret <= 0) break; 245 if (bs->renegotiate_count > 0) 246 { 247 bs->byte_count+=ret; 248 if (bs->byte_count > bs->renegotiate_count) 249 { 250 bs->byte_count=0; 251 bs->num_renegotiates++; 252 SSL_renegotiate(ssl); 253 r=1; 254 } 255 } 256 if ((bs->renegotiate_timeout > 0) && (!r)) 257 { 258 unsigned long tm; 259 260 tm=(unsigned long)time(NULL); 261 if (tm > bs->last_time+bs->renegotiate_timeout) 262 { 263 bs->last_time=tm; 264 bs->num_renegotiates++; 265 SSL_renegotiate(ssl); 266 } 267 } 268 break; 269 case SSL_ERROR_WANT_WRITE: 270 BIO_set_retry_write(b); 271 break; 272 case SSL_ERROR_WANT_READ: 273 BIO_set_retry_read(b); 274 break; 275 case SSL_ERROR_WANT_X509_LOOKUP: 276 BIO_set_retry_special(b); 277 retry_reason=BIO_RR_SSL_X509_LOOKUP; 278 break; 279 case SSL_ERROR_WANT_CONNECT: 280 BIO_set_retry_special(b); 281 retry_reason=BIO_RR_CONNECT; 282 case SSL_ERROR_SYSCALL: 283 case SSL_ERROR_SSL: 284 default: 285 break; 286 } 287 288 b->retry_reason=retry_reason; 289 return(ret); 290 } 291 292 static long ssl_ctrl(BIO *b, int cmd, long num, void *ptr) 293 { 294 SSL **sslp,*ssl; 295 BIO_SSL *bs; 296 BIO *dbio,*bio; 297 long ret=1; 298 299 bs=(BIO_SSL *)b->ptr; 300 ssl=bs->ssl; 301 if ((ssl == NULL) && (cmd != BIO_C_SET_SSL)) 302 return(0); 303 switch (cmd) 304 { 305 case BIO_CTRL_RESET: 306 SSL_shutdown(ssl); 307 308 if (ssl->handshake_func == ssl->method->ssl_connect) 309 SSL_set_connect_state(ssl); 310 else if (ssl->handshake_func == ssl->method->ssl_accept) 311 SSL_set_accept_state(ssl); 312 313 SSL_clear(ssl); 314 315 if (b->next_bio != NULL) 316 ret=BIO_ctrl(b->next_bio,cmd,num,ptr); 317 else if (ssl->rbio != NULL) 318 ret=BIO_ctrl(ssl->rbio,cmd,num,ptr); 319 else 320 ret=1; 321 break; 322 case BIO_CTRL_INFO: 323 ret=0; 324 break; 325 case BIO_C_SSL_MODE: 326 if (num) /* client mode */ 327 SSL_set_connect_state(ssl); 328 else 329 SSL_set_accept_state(ssl); 330 break; 331 case BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT: 332 ret=bs->renegotiate_timeout; 333 if (num < 60) num=5; 334 bs->renegotiate_timeout=(unsigned long)num; 335 bs->last_time=(unsigned long)time(NULL); 336 break; 337 case BIO_C_SET_SSL_RENEGOTIATE_BYTES: 338 ret=bs->renegotiate_count; 339 if ((long)num >=512) 340 bs->renegotiate_count=(unsigned long)num; 341 break; 342 case BIO_C_GET_SSL_NUM_RENEGOTIATES: 343 ret=bs->num_renegotiates; 344 break; 345 case BIO_C_SET_SSL: 346 if (ssl != NULL) 347 ssl_free(b); 348 b->shutdown=(int)num; 349 ssl=(SSL *)ptr; 350 ((BIO_SSL *)b->ptr)->ssl=ssl; 351 bio=SSL_get_rbio(ssl); 352 if (bio != NULL) 353 { 354 if (b->next_bio != NULL) 355 BIO_push(bio,b->next_bio); 356 b->next_bio=bio; 357 CRYPTO_add(&bio->references,1,CRYPTO_LOCK_BIO); 358 } 359 b->init=1; 360 break; 361 case BIO_C_GET_SSL: 362 if (ptr != NULL) 363 { 364 sslp=(SSL **)ptr; 365 *sslp=ssl; 366 } 367 else 368 ret=0; 369 break; 370 case BIO_CTRL_GET_CLOSE: 371 ret=b->shutdown; 372 break; 373 case BIO_CTRL_SET_CLOSE: 374 b->shutdown=(int)num; 375 break; 376 case BIO_CTRL_WPENDING: 377 ret=BIO_ctrl(ssl->wbio,cmd,num,ptr); 378 break; 379 case BIO_CTRL_PENDING: 380 ret=SSL_pending(ssl); 381 if (ret == 0) 382 ret=BIO_pending(ssl->rbio); 383 break; 384 case BIO_CTRL_FLUSH: 385 BIO_clear_retry_flags(b); 386 ret=BIO_ctrl(ssl->wbio,cmd,num,ptr); 387 BIO_copy_next_retry(b); 388 break; 389 case BIO_CTRL_PUSH: 390 if ((b->next_bio != NULL) && (b->next_bio != ssl->rbio)) 391 { 392 SSL_set_bio(ssl,b->next_bio,b->next_bio); 393 CRYPTO_add(&b->next_bio->references,1,CRYPTO_LOCK_BIO); 394 } 395 break; 396 case BIO_CTRL_POP: 397 /* ugly bit of a hack */ 398 if (ssl->rbio != ssl->wbio) /* we are in trouble :-( */ 399 { 400 BIO_free_all(ssl->wbio); 401 } 402 ssl->wbio=NULL; 403 ssl->rbio=NULL; 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 { 413 case SSL_ERROR_WANT_READ: 414 BIO_set_flags(b, 415 BIO_FLAGS_READ|BIO_FLAGS_SHOULD_RETRY); 416 break; 417 case SSL_ERROR_WANT_WRITE: 418 BIO_set_flags(b, 419 BIO_FLAGS_WRITE|BIO_FLAGS_SHOULD_RETRY); 420 break; 421 case SSL_ERROR_WANT_CONNECT: 422 BIO_set_flags(b, 423 BIO_FLAGS_IO_SPECIAL|BIO_FLAGS_SHOULD_RETRY); 424 b->retry_reason=b->next_bio->retry_reason; 425 break; 426 default: 427 break; 428 } 429 break; 430 case BIO_CTRL_DUP: 431 dbio=(BIO *)ptr; 432 if (((BIO_SSL *)dbio->ptr)->ssl != NULL) 433 SSL_free(((BIO_SSL *)dbio->ptr)->ssl); 434 ((BIO_SSL *)dbio->ptr)->ssl=SSL_dup(ssl); 435 ((BIO_SSL *)dbio->ptr)->renegotiate_count= 436 ((BIO_SSL *)b->ptr)->renegotiate_count; 437 ((BIO_SSL *)dbio->ptr)->byte_count= 438 ((BIO_SSL *)b->ptr)->byte_count; 439 ((BIO_SSL *)dbio->ptr)->renegotiate_timeout= 440 ((BIO_SSL *)b->ptr)->renegotiate_timeout; 441 ((BIO_SSL *)dbio->ptr)->last_time= 442 ((BIO_SSL *)b->ptr)->last_time; 443 ret=(((BIO_SSL *)dbio->ptr)->ssl != NULL); 444 break; 445 case BIO_C_GET_FD: 446 ret=BIO_ctrl(ssl->rbio,cmd,num,ptr); 447 break; 448 case BIO_CTRL_SET_CALLBACK: 449 { 450 #if 0 /* FIXME: Should this be used? -- Richard Levitte */ 451 BIOerr(SSL_F_SSL_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 452 ret = -1; 453 #else 454 ret=0; 455 #endif 456 } 457 break; 458 case BIO_CTRL_GET_CALLBACK: 459 { 460 void (**fptr)(); 461 462 fptr=(void (**)())ptr; 463 *fptr=SSL_get_info_callback(ssl); 464 } 465 break; 466 default: 467 ret=BIO_ctrl(ssl->rbio,cmd,num,ptr); 468 break; 469 } 470 return(ret); 471 } 472 473 static long ssl_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) 474 { 475 SSL *ssl; 476 BIO_SSL *bs; 477 long ret=1; 478 479 bs=(BIO_SSL *)b->ptr; 480 ssl=bs->ssl; 481 switch (cmd) 482 { 483 case BIO_CTRL_SET_CALLBACK: 484 { 485 SSL_set_info_callback(ssl,fp); 486 } 487 break; 488 default: 489 ret=BIO_callback_ctrl(ssl->rbio,cmd,fp); 490 break; 491 } 492 return(ret); 493 } 494 495 static int ssl_puts(BIO *bp, const char *str) 496 { 497 int n,ret; 498 499 n=strlen(str); 500 ret=BIO_write(bp,str,n); 501 return(ret); 502 } 503 504 BIO *BIO_new_buffer_ssl_connect(SSL_CTX *ctx) 505 { 506 BIO *ret=NULL,*buf=NULL,*ssl=NULL; 507 508 if ((buf=BIO_new(BIO_f_buffer())) == NULL) 509 return(NULL); 510 if ((ssl=BIO_new_ssl_connect(ctx)) == NULL) 511 goto err; 512 if ((ret=BIO_push(buf,ssl)) == NULL) 513 goto err; 514 return(ret); 515 err: 516 if (buf != NULL) BIO_free(buf); 517 if (ssl != NULL) BIO_free(ssl); 518 return(NULL); 519 } 520 521 BIO *BIO_new_ssl_connect(SSL_CTX *ctx) 522 { 523 BIO *ret=NULL,*con=NULL,*ssl=NULL; 524 525 if ((con=BIO_new(BIO_s_connect())) == NULL) 526 return(NULL); 527 if ((ssl=BIO_new_ssl(ctx,1)) == NULL) 528 goto err; 529 if ((ret=BIO_push(ssl,con)) == NULL) 530 goto err; 531 return(ret); 532 err: 533 if (con != NULL) BIO_free(con); 534 if (ret != NULL) BIO_free(ret); 535 return(NULL); 536 } 537 538 BIO *BIO_new_ssl(SSL_CTX *ctx, int client) 539 { 540 BIO *ret; 541 SSL *ssl; 542 543 if ((ret=BIO_new(BIO_f_ssl())) == NULL) 544 return(NULL); 545 if ((ssl=SSL_new(ctx)) == NULL) 546 { 547 BIO_free(ret); 548 return(NULL); 549 } 550 if (client) 551 SSL_set_connect_state(ssl); 552 else 553 SSL_set_accept_state(ssl); 554 555 BIO_set_ssl(ret,ssl,BIO_CLOSE); 556 return(ret); 557 } 558 559 int BIO_ssl_copy_session_id(BIO *t, BIO *f) 560 { 561 t=BIO_find_type(t,BIO_TYPE_SSL); 562 f=BIO_find_type(f,BIO_TYPE_SSL); 563 if ((t == NULL) || (f == NULL)) 564 return(0); 565 if ( (((BIO_SSL *)t->ptr)->ssl == NULL) || 566 (((BIO_SSL *)f->ptr)->ssl == NULL)) 567 return(0); 568 SSL_copy_session_id(((BIO_SSL *)t->ptr)->ssl,((BIO_SSL *)f->ptr)->ssl); 569 return(1); 570 } 571 572 void BIO_ssl_shutdown(BIO *b) 573 { 574 SSL *s; 575 576 while (b != NULL) 577 { 578 if (b->method->type == BIO_TYPE_SSL) 579 { 580 s=((BIO_SSL *)b->ptr)->ssl; 581 SSL_shutdown(s); 582 break; 583 } 584 b=b->next_bio; 585 } 586 } 587