ssl/bio_ssl.c

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <errno.h>
  14 #include <openssl/crypto.h>
  15 #include "internal/bio.h"
  16 #include <openssl/err.h>
  17 #include "ssl_locl.h"
  18
  19 static int ssl_write(BIO *h, const char *buf, size_t size, size_t *written);
  20 static int ssl_read(BIO *b, char *buf, size_t size, size_t *readbytes);
  21 static int ssl_puts(BIO *h, const char *str);
  22 static long ssl_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  23 static int ssl_new(BIO *h);
  24 static int ssl_free(BIO *data);
  25 static long ssl_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
  26 typedef struct bio_ssl_st {
  27     SSL *ssl;                   /* The ssl handle :-) */
  28     /* re-negotiate every time the total number of bytes is this size */
  29     int num_renegotiates;
  30     unsigned long renegotiate_count;
  31     size_t byte_count;
  32     unsigned long renegotiate_timeout;
  33     unsigned long last_time;
  34 } BIO_SSL;
  35
  36 static const BIO_METHOD methods_sslp = {
  37     BIO_TYPE_SSL,
  38     "ssl",
  39     ssl_write,
  40     NULL,                       /* ssl_write_old, */
  41     ssl_read,
  42     NULL,                       /* ssl_read_old,  */
  43     ssl_puts,
  44     NULL,                       /* ssl_gets,      */
  45     ssl_ctrl,
  46     ssl_new,
  47     ssl_free,
  48     ssl_callback_ctrl,
  49 };
  50
  51 const BIO_METHOD *BIO_f_ssl(void)
  52 {
  53     return &methods_sslp;
  54 }
  55
  56 static int ssl_new(BIO *bi)
  57 {
  58     BIO_SSL *bs = OPENSSL_zalloc(sizeof(*bs));
  59
  60     if (bs == NULL) {
  61         BIOerr(BIO_F_SSL_NEW, ERR_R_MALLOC_FAILURE);
  62         return 0;
  63     }
  64     BIO_set_init(bi, 0);
  65     BIO_set_data(bi, bs);
  66     /* Clear all flags */
  67     BIO_clear_flags(bi, ~0);
  68
  69     return 1;
  70 }
  71
  72 static int ssl_free(BIO *a)
  73 {
  74     BIO_SSL *bs;
  75
  76     if (a == NULL)
  77         return 0;
  78     bs = BIO_get_data(a);
  79     if (bs->ssl != NULL)
  80         SSL_shutdown(bs->ssl);
  81     if (BIO_get_shutdown(a)) {
  82         if (BIO_get_init(a))
  83             SSL_free(bs->ssl);
  84         /* Clear all flags */
  85         BIO_clear_flags(a, ~0);
  86         BIO_set_init(a, 0);
  87     }
  88     OPENSSL_free(bs);
  89     return 1;
  90 }
  91
  92 static int ssl_read(BIO *b, char *buf, size_t size, size_t *readbytes)
  93 {
  94     int ret = 1;
  95     BIO_SSL *sb;
  96     SSL *ssl;
  97     int retry_reason = 0;
  98     int r = 0;
  99
 100     if (buf == NULL)
 101         return 0;
 102     sb = BIO_get_data(b);
 103     ssl = sb->ssl;
 104
 105     BIO_clear_retry_flags(b);
 106
 107     ret = ssl_read_internal(ssl, buf, size, readbytes);
 108
 109     switch (SSL_get_error(ssl, ret)) {
 110     case SSL_ERROR_NONE:
 111         if (sb->renegotiate_count > 0) {
 112             sb->byte_count += *readbytes;
 113             if (sb->byte_count > sb->renegotiate_count) {
 114                 sb->byte_count = 0;
 115                 sb->num_renegotiates++;
 116                 SSL_renegotiate(ssl);
 117                 r = 1;
 118             }
 119         }
 120         if ((sb->renegotiate_timeout > 0) && (!r)) {
 121             unsigned long tm;
 122
 123             tm = (unsigned long)time(NULL);
 124             if (tm > sb->last_time + sb->renegotiate_timeout) {
 125                 sb->last_time = tm;
 126                 sb->num_renegotiates++;
 127                 SSL_renegotiate(ssl);
 128             }
 129         }
 130
 131         break;
 132     case SSL_ERROR_WANT_READ:
 133         BIO_set_retry_read(b);
 134         break;
 135     case SSL_ERROR_WANT_WRITE:
 136         BIO_set_retry_write(b);
 137         break;
 138     case SSL_ERROR_WANT_X509_LOOKUP:
 139         BIO_set_retry_special(b);
 140         retry_reason = BIO_RR_SSL_X509_LOOKUP;
 141         break;
 142     case SSL_ERROR_WANT_ACCEPT:
 143         BIO_set_retry_special(b);
 144         retry_reason = BIO_RR_ACCEPT;
 145         break;
 146     case SSL_ERROR_WANT_CONNECT:
 147         BIO_set_retry_special(b);
 148         retry_reason = BIO_RR_CONNECT;
 149         break;
 150     case SSL_ERROR_SYSCALL:
 151     case SSL_ERROR_SSL:
 152     case SSL_ERROR_ZERO_RETURN:
 153     default:
 154         break;
 155     }
 156
 157     BIO_set_retry_reason(b, retry_reason);
 158
 159     return ret;
 160 }
 161
 162 static int ssl_write(BIO *b, const char *buf, size_t size, size_t *written)
 163 {
 164     int ret, r = 0;
 165     int retry_reason = 0;
 166     SSL *ssl;
 167     BIO_SSL *bs;
 168
 169     if (buf == NULL)
 170         return 0;
 171     bs = BIO_get_data(b);
 172     ssl = bs->ssl;
 173
 174     BIO_clear_retry_flags(b);
 175
 176     ret = ssl_write_internal(ssl, buf, size, written);
 177
 178     switch (SSL_get_error(ssl, ret)) {
 179     case SSL_ERROR_NONE:
 180         if (bs->renegotiate_count > 0) {
 181             bs->byte_count += *written;
 182             if (bs->byte_count > bs->renegotiate_count) {
 183                 bs->byte_count = 0;
 184                 bs->num_renegotiates++;
 185                 SSL_renegotiate(ssl);
 186                 r = 1;
 187             }
 188         }
 189         if ((bs->renegotiate_timeout > 0) && (!r)) {
 190             unsigned long tm;
 191
 192             tm = (unsigned long)time(NULL);
 193             if (tm > bs->last_time + bs->renegotiate_timeout) {
 194                 bs->last_time = tm;
 195                 bs->num_renegotiates++;
 196                 SSL_renegotiate(ssl);
 197             }
 198         }
 199         break;
 200     case SSL_ERROR_WANT_WRITE:
 201         BIO_set_retry_write(b);
 202         break;
 203     case SSL_ERROR_WANT_READ:
 204         BIO_set_retry_read(b);
 205         break;
 206     case SSL_ERROR_WANT_X509_LOOKUP:
 207         BIO_set_retry_special(b);
 208         retry_reason = BIO_RR_SSL_X509_LOOKUP;
 209         break;
 210     case SSL_ERROR_WANT_CONNECT:
 211         BIO_set_retry_special(b);
 212         retry_reason = BIO_RR_CONNECT;
 213     case SSL_ERROR_SYSCALL:
 214     case SSL_ERROR_SSL:
 215     default:
 216         break;
 217     }
 218
 219     BIO_set_retry_reason(b, retry_reason);
 220
 221     return ret;
 222 }
 223
 224 static long ssl_ctrl(BIO *b, int cmd, long num, void *ptr)
 225 {
 226     SSL **sslp, *ssl;
 227     BIO_SSL *bs, *dbs;
 228     BIO *dbio, *bio;
 229     long ret = 1;
 230     BIO *next;
 231
 232     bs = BIO_get_data(b);
 233     next = BIO_next(b);
 234     ssl = bs->ssl;
 235     if ((ssl == NULL) && (cmd != BIO_C_SET_SSL))
 236         return 0;
 237     switch (cmd) {
 238     case BIO_CTRL_RESET:
 239         SSL_shutdown(ssl);
 240
 241         if (ssl->handshake_func == ssl->method->ssl_connect)
 242             SSL_set_connect_state(ssl);
 243         else if (ssl->handshake_func == ssl->method->ssl_accept)
 244             SSL_set_accept_state(ssl);
 245
 246         if (!SSL_clear(ssl)) {
 247             ret = 0;
 248             break;
 249         }
 250
 251         if (next != NULL)
 252             ret = BIO_ctrl(next, cmd, num, ptr);
 253         else if (ssl->rbio != NULL)
 254             ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);
 255         else
 256             ret = 1;
 257         break;
 258     case BIO_CTRL_INFO:
 259         ret = 0;
 260         break;
 261     case BIO_C_SSL_MODE:
 262         if (num)                /* client mode */
 263             SSL_set_connect_state(ssl);
 264         else
 265             SSL_set_accept_state(ssl);
 266         break;
 267     case BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT:
 268         ret = bs->renegotiate_timeout;
 269         if (num < 60)
 270             num = 5;
 271         bs->renegotiate_timeout = (unsigned long)num;
 272         bs->last_time = (unsigned long)time(NULL);
 273         break;
 274     case BIO_C_SET_SSL_RENEGOTIATE_BYTES:
 275         ret = bs->renegotiate_count;
 276         if ((long)num >= 512)
 277             bs->renegotiate_count = (unsigned long)num;
 278         break;
 279     case BIO_C_GET_SSL_NUM_RENEGOTIATES:
 280         ret = bs->num_renegotiates;
 281         break;
 282     case BIO_C_SET_SSL:
 283         if (ssl != NULL) {
 284             ssl_free(b);
 285             if (!ssl_new(b))
 286                 return 0;
 287         }
 288         BIO_set_shutdown(b, num);
 289         ssl = (SSL *)ptr;
 290         bs->ssl = ssl;
 291         bio = SSL_get_rbio(ssl);
 292         if (bio != NULL) {
 293             if (next != NULL)
 294                 BIO_push(bio, next);
 295             BIO_set_next(b, bio);
 296             BIO_up_ref(bio);
 297         }
 298         BIO_set_init(b, 1);
 299         break;
 300     case BIO_C_GET_SSL:
 301         if (ptr != NULL) {
 302             sslp = (SSL **)ptr;
 303             *sslp = ssl;
 304         } else
 305             ret = 0;
 306         break;
 307     case BIO_CTRL_GET_CLOSE:
 308         ret = BIO_get_shutdown(b);
 309         break;
 310     case BIO_CTRL_SET_CLOSE:
 311         BIO_set_shutdown(b, (int)num);
 312         break;
 313     case BIO_CTRL_WPENDING:
 314         ret = BIO_ctrl(ssl->wbio, cmd, num, ptr);
 315         break;
 316     case BIO_CTRL_PENDING:
 317         ret = SSL_pending(ssl);
 318         if (ret == 0)
 319             ret = BIO_pending(ssl->rbio);
 320         break;
 321     case BIO_CTRL_FLUSH:
 322         BIO_clear_retry_flags(b);
 323         ret = BIO_ctrl(ssl->wbio, cmd, num, ptr);
 324         BIO_copy_next_retry(b);
 325         break;
 326     case BIO_CTRL_PUSH:
 327         if ((next != NULL) && (next != ssl->rbio)) {
 328             /*
 329              * We are going to pass ownership of next to the SSL object...but
 330              * we don't own a reference to pass yet - so up ref
 331              */
 332             BIO_up_ref(next);
 333             SSL_set_bio(ssl, next, next);
 334         }
 335         break;
 336     case BIO_CTRL_POP:
 337         /* Only detach if we are the BIO explicitly being popped */
 338         if (b == ptr) {
 339             /* This will clear the reference we obtained during push */
 340             SSL_set_bio(ssl, NULL, NULL);
 341         }
 342         break;
 343     case BIO_C_DO_STATE_MACHINE:
 344         BIO_clear_retry_flags(b);
 345
 346         BIO_set_retry_reason(b, 0);
 347         ret = (int)SSL_do_handshake(ssl);
 348
 349         switch (SSL_get_error(ssl, (int)ret)) {
 350         case SSL_ERROR_WANT_READ:
 351             BIO_set_flags(b, BIO_FLAGS_READ | BIO_FLAGS_SHOULD_RETRY);
 352             break;
 353         case SSL_ERROR_WANT_WRITE:
 354             BIO_set_flags(b, BIO_FLAGS_WRITE | BIO_FLAGS_SHOULD_RETRY);
 355             break;
 356         case SSL_ERROR_WANT_CONNECT:
 357             BIO_set_flags(b, BIO_FLAGS_IO_SPECIAL | BIO_FLAGS_SHOULD_RETRY);
 358             BIO_set_retry_reason(b, BIO_get_retry_reason(next));
 359             break;
 360         case SSL_ERROR_WANT_X509_LOOKUP:
 361             BIO_set_retry_special(b);
 362             BIO_set_retry_reason(b, BIO_RR_SSL_X509_LOOKUP);
 363             break;
 364         default:
 365             break;
 366         }
 367         break;
 368     case BIO_CTRL_DUP:
 369         dbio = (BIO *)ptr;
 370         dbs = BIO_get_data(dbio);
 371         SSL_free(dbs->ssl);
 372         dbs->ssl = SSL_dup(ssl);
 373         dbs->num_renegotiates = bs->num_renegotiates;
 374         dbs->renegotiate_count = bs->renegotiate_count;
 375         dbs->byte_count = bs->byte_count;
 376         dbs->renegotiate_timeout = bs->renegotiate_timeout;
 377         dbs->last_time = bs->last_time;
 378         ret = (dbs->ssl != NULL);
 379         break;
 380     case BIO_C_GET_FD:
 381         ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);
 382         break;
 383     case BIO_CTRL_SET_CALLBACK:
 384         ret = 0; /* use callback ctrl */
 385         break;
 386     default:
 387         ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);
 388         break;
 389     }
 390     return ret;
 391 }
 392
 393 static long ssl_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
 394 {
 395     SSL *ssl;
 396     BIO_SSL *bs;
 397     long ret = 1;
 398
 399     bs = BIO_get_data(b);
 400     ssl = bs->ssl;
 401     switch (cmd) {
 402     case BIO_CTRL_SET_CALLBACK:
 403         ret = BIO_callback_ctrl(ssl->rbio, cmd, fp);
 404         break;
 405     default:
 406         ret = 0;
 407         break;
 408     }
 409     return ret;
 410 }
 411
 412 static int ssl_puts(BIO *bp, const char *str)
 413 {
 414     int n, ret;
 415
 416     n = strlen(str);
 417     ret = BIO_write(bp, str, n);
 418     return ret;
 419 }
 420
 421 BIO *BIO_new_buffer_ssl_connect(SSL_CTX *ctx)
 422 {
 423 #ifndef OPENSSL_NO_SOCK
 424     BIO *ret = NULL, *buf = NULL, *ssl = NULL;
 425
 426     if ((buf = BIO_new(BIO_f_buffer())) == NULL)
 427         return NULL;
 428     if ((ssl = BIO_new_ssl_connect(ctx)) == NULL)
 429         goto err;
 430     if ((ret = BIO_push(buf, ssl)) == NULL)
 431         goto err;
 432     return ret;
 433  err:
 434     BIO_free(buf);
 435     BIO_free(ssl);
 436 #endif
 437     return NULL;
 438 }
 439
 440 BIO *BIO_new_ssl_connect(SSL_CTX *ctx)
 441 {
 442 #ifndef OPENSSL_NO_SOCK
 443     BIO *ret = NULL, *con = NULL, *ssl = NULL;
 444
 445     if ((con = BIO_new(BIO_s_connect())) == NULL)
 446         return NULL;
 447     if ((ssl = BIO_new_ssl(ctx, 1)) == NULL)
 448         goto err;
 449     if ((ret = BIO_push(ssl, con)) == NULL)
 450         goto err;
 451     return ret;
 452  err:
 453     BIO_free(con);
 454 #endif
 455     return NULL;
 456 }
 457
 458 BIO *BIO_new_ssl(SSL_CTX *ctx, int client)
 459 {
 460     BIO *ret;
 461     SSL *ssl;
 462
 463     if ((ret = BIO_new(BIO_f_ssl())) == NULL)
 464         return NULL;
 465     if ((ssl = SSL_new(ctx)) == NULL) {
 466         BIO_free(ret);
 467         return NULL;
 468     }
 469     if (client)
 470         SSL_set_connect_state(ssl);
 471     else
 472         SSL_set_accept_state(ssl);
 473
 474     BIO_set_ssl(ret, ssl, BIO_CLOSE);
 475     return ret;
 476 }
 477
 478 int BIO_ssl_copy_session_id(BIO *t, BIO *f)
 479 {
 480     BIO_SSL *tdata, *fdata;
 481     t = BIO_find_type(t, BIO_TYPE_SSL);
 482     f = BIO_find_type(f, BIO_TYPE_SSL);
 483     if ((t == NULL) || (f == NULL))
 484         return 0;
 485     tdata = BIO_get_data(t);
 486     fdata = BIO_get_data(f);
 487     if ((tdata->ssl == NULL) || (fdata->ssl == NULL))
 488         return 0;
 489     if (!SSL_copy_session_id(tdata->ssl, (fdata->ssl)))
 490         return 0;
 491     return 1;
 492 }
 493
 494 void BIO_ssl_shutdown(BIO *b)
 495 {
 496     BIO_SSL *bdata;
 497
 498     for (; b != NULL; b = BIO_next(b)) {
 499         if (BIO_method_type(b) != BIO_TYPE_SSL)
 500             continue;
 501         bdata = BIO_get_data(b);
 502         if (bdata != NULL && bdata->ssl != NULL)
 503             SSL_shutdown(bdata->ssl);
 504     }
 505 }