1 /* ssl/bio_ssl.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 } 600
