diff options
Diffstat (limited to 'openssl/crypto/bio/bss_bio.c')
| -rw-r--r-- | openssl/crypto/bio/bss_bio.c | 924 |
1 files changed, 924 insertions, 0 deletions
diff --git a/openssl/crypto/bio/bss_bio.c b/openssl/crypto/bio/bss_bio.c new file mode 100644 index 000000000..76bd48e76 --- /dev/null +++ b/openssl/crypto/bio/bss_bio.c @@ -0,0 +1,924 @@ +/* crypto/bio/bss_bio.c -*- Mode: C; c-file-style: "eay" -*- */ +/* ==================================================================== + * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * openssl-core@openssl.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.openssl.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). + * + */ + +/* Special method for a BIO where the other endpoint is also a BIO + * of this kind, handled by the same thread (i.e. the "peer" is actually + * ourselves, wearing a different hat). + * Such "BIO pairs" are mainly for using the SSL library with I/O interfaces + * for which no specific BIO method is available. + * See ssl/ssltest.c for some hints on how this can be used. */ + +/* BIO_DEBUG implies BIO_PAIR_DEBUG */ +#ifdef BIO_DEBUG +# ifndef BIO_PAIR_DEBUG +# define BIO_PAIR_DEBUG +# endif +#endif + +/* disable assert() unless BIO_PAIR_DEBUG has been defined */ +#ifndef BIO_PAIR_DEBUG +# ifndef NDEBUG +# define NDEBUG +# endif +#endif + +#include <assert.h> +#include <limits.h> +#include <stdlib.h> +#include <string.h> + +#include <openssl/bio.h> +#include <openssl/err.h> +#include <openssl/crypto.h> + +#include "e_os.h" + +/* VxWorks defines SSIZE_MAX with an empty value causing compile errors */ +#if defined(OPENSSL_SYS_VXWORKS) +# undef SSIZE_MAX +#endif +#ifndef SSIZE_MAX +# define SSIZE_MAX INT_MAX +#endif + +static int bio_new(BIO *bio); +static int bio_free(BIO *bio); +static int bio_read(BIO *bio, char *buf, int size); +static int bio_write(BIO *bio, const char *buf, int num); +static long bio_ctrl(BIO *bio, int cmd, long num, void *ptr); +static int bio_puts(BIO *bio, const char *str); + +static int bio_make_pair(BIO *bio1, BIO *bio2); +static void bio_destroy_pair(BIO *bio); + +static BIO_METHOD methods_biop = +{ + BIO_TYPE_BIO, + "BIO pair", + bio_write, + bio_read, + bio_puts, + NULL /* no bio_gets */, + bio_ctrl, + bio_new, + bio_free, + NULL /* no bio_callback_ctrl */ +}; + +BIO_METHOD *BIO_s_bio(void) + { + return &methods_biop; + } + +struct bio_bio_st +{ + BIO *peer; /* NULL if buf == NULL. + * If peer != NULL, then peer->ptr is also a bio_bio_st, + * and its "peer" member points back to us. + * peer != NULL iff init != 0 in the BIO. */ + + /* This is for what we write (i.e. reading uses peer's struct): */ + int closed; /* valid iff peer != NULL */ + size_t len; /* valid iff buf != NULL; 0 if peer == NULL */ + size_t offset; /* valid iff buf != NULL; 0 if len == 0 */ + size_t size; + char *buf; /* "size" elements (if != NULL) */ + + size_t request; /* valid iff peer != NULL; 0 if len != 0, + * otherwise set by peer to number of bytes + * it (unsuccessfully) tried to read, + * never more than buffer space (size-len) warrants. */ +}; + +static int bio_new(BIO *bio) + { + struct bio_bio_st *b; + + b = OPENSSL_malloc(sizeof *b); + if (b == NULL) + return 0; + + b->peer = NULL; + b->size = 17*1024; /* enough for one TLS record (just a default) */ + b->buf = NULL; + + bio->ptr = b; + return 1; + } + + +static int bio_free(BIO *bio) + { + struct bio_bio_st *b; + + if (bio == NULL) + return 0; + b = bio->ptr; + + assert(b != NULL); + + if (b->peer) + bio_destroy_pair(bio); + + if (b->buf != NULL) + { + OPENSSL_free(b->buf); + } + + OPENSSL_free(b); + + return 1; + } + + + +static int bio_read(BIO *bio, char *buf, int size_) + { + size_t size = size_; + size_t rest; + struct bio_bio_st *b, *peer_b; + + BIO_clear_retry_flags(bio); + + if (!bio->init) + return 0; + + b = bio->ptr; + assert(b != NULL); + assert(b->peer != NULL); + peer_b = b->peer->ptr; + assert(peer_b != NULL); + assert(peer_b->buf != NULL); + + peer_b->request = 0; /* will be set in "retry_read" situation */ + + if (buf == NULL || size == 0) + return 0; + + if (peer_b->len == 0) + { + if (peer_b->closed) + return 0; /* writer has closed, and no data is left */ + else + { + BIO_set_retry_read(bio); /* buffer is empty */ + if (size <= peer_b->size) + peer_b->request = size; + else + /* don't ask for more than the peer can + * deliver in one write */ + peer_b->request = peer_b->size; + return -1; + } + } + + /* we can read */ + if (peer_b->len < size) + size = peer_b->len; + + /* now read "size" bytes */ + + rest = size; + + assert(rest > 0); + do /* one or two iterations */ + { + size_t chunk; + + assert(rest <= peer_b->len); + if (peer_b->offset + rest <= peer_b->size) + chunk = rest; + else + /* wrap around ring buffer */ + chunk = peer_b->size - peer_b->offset; + assert(peer_b->offset + chunk <= peer_b->size); + + memcpy(buf, peer_b->buf + peer_b->offset, chunk); + + peer_b->len -= chunk; + if (peer_b->len) + { + peer_b->offset += chunk; + assert(peer_b->offset <= peer_b->size); + if (peer_b->offset == peer_b->size) + peer_b->offset = 0; + buf += chunk; + } + else + { + /* buffer now empty, no need to advance "buf" */ + assert(chunk == rest); + peer_b->offset = 0; + } + rest -= chunk; + } + while (rest); + + return size; + } + +/* non-copying interface: provide pointer to available data in buffer + * bio_nread0: return number of available bytes + * bio_nread: also advance index + * (example usage: bio_nread0(), read from buffer, bio_nread() + * or just bio_nread(), read from buffer) + */ +/* WARNING: The non-copying interface is largely untested as of yet + * and may contain bugs. */ +static ssize_t bio_nread0(BIO *bio, char **buf) + { + struct bio_bio_st *b, *peer_b; + ssize_t num; + + BIO_clear_retry_flags(bio); + + if (!bio->init) + return 0; + + b = bio->ptr; + assert(b != NULL); + assert(b->peer != NULL); + peer_b = b->peer->ptr; + assert(peer_b != NULL); + assert(peer_b->buf != NULL); + + peer_b->request = 0; + + if (peer_b->len == 0) + { + char dummy; + + /* avoid code duplication -- nothing available for reading */ + return bio_read(bio, &dummy, 1); /* returns 0 or -1 */ + } + + num = peer_b->len; + if (peer_b->size < peer_b->offset + num) + /* no ring buffer wrap-around for non-copying interface */ + num = peer_b->size - peer_b->offset; + assert(num > 0); + + if (buf != NULL) + *buf = peer_b->buf + peer_b->offset; + return num; + } + +static ssize_t bio_nread(BIO *bio, char **buf, size_t num_) + { + struct bio_bio_st *b, *peer_b; + ssize_t num, available; + + if (num_ > SSIZE_MAX) + num = SSIZE_MAX; + else + num = (ssize_t)num_; + + available = bio_nread0(bio, buf); + if (num > available) + num = available; + if (num <= 0) + return num; + + b = bio->ptr; + peer_b = b->peer->ptr; + + peer_b->len -= num; + if (peer_b->len) + { + peer_b->offset += num; + assert(peer_b->offset <= peer_b->size); + if (peer_b->offset == peer_b->size) + peer_b->offset = 0; + } + else + peer_b->offset = 0; + + return num; + } + + +static int bio_write(BIO *bio, const char *buf, int num_) + { + size_t num = num_; + size_t rest; + struct bio_bio_st *b; + + BIO_clear_retry_flags(bio); + + if (!bio->init || buf == NULL || num == 0) + return 0; + + b = bio->ptr; + assert(b != NULL); + assert(b->peer != NULL); + assert(b->buf != NULL); + + b->request = 0; + if (b->closed) + { + /* we already closed */ + BIOerr(BIO_F_BIO_WRITE, BIO_R_BROKEN_PIPE); + return -1; + } + + assert(b->len <= b->size); + + if (b->len == b->size) + { + BIO_set_retry_write(bio); /* buffer is full */ + return -1; + } + + /* we can write */ + if (num > b->size - b->len) + num = b->size - b->len; + + /* now write "num" bytes */ + + rest = num; + + assert(rest > 0); + do /* one or two iterations */ + { + size_t write_offset; + size_t chunk; + + assert(b->len + rest <= b->size); + + write_offset = b->offset + b->len; + if (write_offset >= b->size) + write_offset -= b->size; + /* b->buf[write_offset] is the first byte we can write to. */ + + if (write_offset + rest <= b->size) + chunk = rest; + else + /* wrap around ring buffer */ + chunk = b->size - write_offset; + + memcpy(b->buf + write_offset, buf, chunk); + + b->len += chunk; + + assert(b->len <= b->size); + + rest -= chunk; + buf += chunk; + } + while (rest); + + return num; + } + +/* non-copying interface: provide pointer to region to write to + * bio_nwrite0: check how much space is available + * bio_nwrite: also increase length + * (example usage: bio_nwrite0(), write to buffer, bio_nwrite() + * or just bio_nwrite(), write to buffer) + */ +static ssize_t bio_nwrite0(BIO *bio, char **buf) + { + struct bio_bio_st *b; + size_t num; + size_t write_offset; + + BIO_clear_retry_flags(bio); + + if (!bio->init) + return 0; + + b = bio->ptr; + assert(b != NULL); + assert(b->peer != NULL); + assert(b->buf != NULL); + + b->request = 0; + if (b->closed) + { + BIOerr(BIO_F_BIO_NWRITE0, BIO_R_BROKEN_PIPE); + return -1; + } + + assert(b->len <= b->size); + + if (b->len == b->size) + { + BIO_set_retry_write(bio); + return -1; + } + + num = b->size - b->len; + write_offset = b->offset + b->len; + if (write_offset >= b->size) + write_offset -= b->size; + if (write_offset + num > b->size) + /* no ring buffer wrap-around for non-copying interface + * (to fulfil the promise by BIO_ctrl_get_write_guarantee, + * BIO_nwrite may have to be called twice) */ + num = b->size - write_offset; + + if (buf != NULL) + *buf = b->buf + write_offset; + assert(write_offset + num <= b->size); + + return num; + } + +static ssize_t bio_nwrite(BIO *bio, char **buf, size_t num_) + { + struct bio_bio_st *b; + ssize_t num, space; + + if (num_ > SSIZE_MAX) + num = SSIZE_MAX; + else + num = (ssize_t)num_; + + space = bio_nwrite0(bio, buf); + if (num > space) + num = space; + if (num <= 0) + return num; + b = bio->ptr; + assert(b != NULL); + b->len += num; + assert(b->len <= b->size); + + return num; + } + + +static long bio_ctrl(BIO *bio, int cmd, long num, void *ptr) + { + long ret; + struct bio_bio_st *b = bio->ptr; + + assert(b != NULL); + + switch (cmd) + { + /* specific CTRL codes */ + + case BIO_C_SET_WRITE_BUF_SIZE: + if (b->peer) + { + BIOerr(BIO_F_BIO_CTRL, BIO_R_IN_USE); + ret = 0; + } + else if (num == 0) + { + BIOerr(BIO_F_BIO_CTRL, BIO_R_INVALID_ARGUMENT); + ret = 0; + } + else + { + size_t new_size = num; + + if (b->size != new_size) + { + if (b->buf) + { + OPENSSL_free(b->buf); + b->buf = NULL; + } + b->size = new_size; + } + ret = 1; + } + break; + + case BIO_C_GET_WRITE_BUF_SIZE: + ret = (long) b->size; + break; + + case BIO_C_MAKE_BIO_PAIR: + { + BIO *other_bio = ptr; + + if (bio_make_pair(bio, other_bio)) + ret = 1; + else + ret = 0; + } + break; + + case BIO_C_DESTROY_BIO_PAIR: + /* Affects both BIOs in the pair -- call just once! + * Or let BIO_free(bio1); BIO_free(bio2); do the job. */ + bio_destroy_pair(bio); + ret = 1; + break; + + case BIO_C_GET_WRITE_GUARANTEE: + /* How many bytes can the caller feed to the next write + * without having to keep any? */ + if (b->peer == NULL || b->closed) + ret = 0; + else + ret = (long) b->size - b->len; + break; + + case BIO_C_GET_READ_REQUEST: + /* If the peer unsuccessfully tried to read, how many bytes + * were requested? (As with BIO_CTRL_PENDING, that number + * can usually be treated as boolean.) */ + ret = (long) b->request; + break; + + case BIO_C_RESET_READ_REQUEST: + /* Reset request. (Can be useful after read attempts + * at the other side that are meant to be non-blocking, + * e.g. when probing SSL_read to see if any data is + * available.) */ + b->request = 0; + ret = 1; + break; + + case BIO_C_SHUTDOWN_WR: + /* similar to shutdown(..., SHUT_WR) */ + b->closed = 1; + ret = 1; + break; + + case BIO_C_NREAD0: + /* prepare for non-copying read */ + ret = (long) bio_nread0(bio, ptr); + break; + + case BIO_C_NREAD: + /* non-copying read */ + ret = (long) bio_nread(bio, ptr, (size_t) num); + break; + + case BIO_C_NWRITE0: + /* prepare for non-copying write */ + ret = (long) bio_nwrite0(bio, ptr); + break; + + case BIO_C_NWRITE: + /* non-copying write */ + ret = (long) bio_nwrite(bio, ptr, (size_t) num); + break; + + + /* standard CTRL codes follow */ + + case BIO_CTRL_RESET: + if (b->buf != NULL) + { + b->len = 0; + b->offset = 0; + } + ret = 0; + break; + + case BIO_CTRL_GET_CLOSE: + ret = bio->shutdown; + break; + + case BIO_CTRL_SET_CLOSE: + bio->shutdown = (int) num; + ret = 1; + break; + + case BIO_CTRL_PENDING: + if (b->peer != NULL) + { + struct bio_bio_st *peer_b = b->peer->ptr; + + ret = (long) peer_b->len; + } + else + ret = 0; + break; + + case BIO_CTRL_WPENDING: + if (b->buf != NULL) + ret = (long) b->len; + else + ret = 0; + break; + + case BIO_CTRL_DUP: + /* See BIO_dup_chain for circumstances we have to expect. */ + { + BIO *other_bio = ptr; + struct bio_bio_st *other_b; + + assert(other_bio != NULL); + other_b = other_bio->ptr; + assert(other_b != NULL); + + assert(other_b->buf == NULL); /* other_bio is always fresh */ + + other_b->size = b->size; + } + + ret = 1; + break; + + case BIO_CTRL_FLUSH: + ret = 1; + break; + + case BIO_CTRL_EOF: + { + BIO *other_bio = ptr; + + if (other_bio) + { + struct bio_bio_st *other_b = other_bio->ptr; + + assert(other_b != NULL); + ret = other_b->len == 0 && other_b->closed; + } + else + ret = 1; + } + break; + + default: + ret = 0; + } + return ret; + } + +static int bio_puts(BIO *bio, const char *str) + { + return bio_write(bio, str, strlen(str)); + } + + +static int bio_make_pair(BIO *bio1, BIO *bio2) + { + struct bio_bio_st *b1, *b2; + + assert(bio1 != NULL); + assert(bio2 != NULL); + + b1 = bio1->ptr; + b2 = bio2->ptr; + + if (b1->peer != NULL || b2->peer != NULL) + { + BIOerr(BIO_F_BIO_MAKE_PAIR, BIO_R_IN_USE); + return 0; + } + + if (b1->buf == NULL) + { + b1->buf = OPENSSL_malloc(b1->size); + if (b1->buf == NULL) + { + BIOerr(BIO_F_BIO_MAKE_PAIR, ERR_R_MALLOC_FAILURE); + return 0; + } + b1->len = 0; + b1->offset = 0; + } + + if (b2->buf == NULL) + { + b2->buf = OPENSSL_malloc(b2->size); + if (b2->buf == NULL) + { + BIOerr(BIO_F_BIO_MAKE_PAIR, ERR_R_MALLOC_FAILURE); + return 0; + } + b2->len = 0; + b2->offset = 0; + } + + b1->peer = bio2; + b1->closed = 0; + b1->request = 0; + b2->peer = bio1; + b2->closed = 0; + b2->request = 0; + + bio1->init = 1; + bio2->init = 1; + + return 1; + } + +static void bio_destroy_pair(BIO *bio) + { + struct bio_bio_st *b = bio->ptr; + + if (b != NULL) + { + BIO *peer_bio = b->peer; + + if (peer_bio != NULL) + { + struct bio_bio_st *peer_b = peer_bio->ptr; + + assert(peer_b != NULL); + assert(peer_b->peer == bio); + + peer_b->peer = NULL; + peer_bio->init = 0; + assert(peer_b->buf != NULL); + peer_b->len = 0; + peer_b->offset = 0; + + b->peer = NULL; + bio->init = 0; + assert(b->buf != NULL); + b->len = 0; + b->offset = 0; + } + } + } + + +/* Exported convenience functions */ +int BIO_new_bio_pair(BIO **bio1_p, size_t writebuf1, + BIO **bio2_p, size_t writebuf2) + { + BIO *bio1 = NULL, *bio2 = NULL; + long r; + int ret = 0; + + bio1 = BIO_new(BIO_s_bio()); + if (bio1 == NULL) + goto err; + bio2 = BIO_new(BIO_s_bio()); + if (bio2 == NULL) + goto err; + + if (writebuf1) + { + r = BIO_set_write_buf_size(bio1, writebuf1); + if (!r) + goto err; + } + if (writebuf2) + { + r = BIO_set_write_buf_size(bio2, writebuf2); + if (!r) + goto err; + } + + r = BIO_make_bio_pair(bio1, bio2); + if (!r) + goto err; + ret = 1; + + err: + if (ret == 0) + { + if (bio1) + { + BIO_free(bio1); + bio1 = NULL; + } + if (bio2) + { + BIO_free(bio2); + bio2 = NULL; + } + } + + *bio1_p = bio1; + *bio2_p = bio2; + return ret; + } + +size_t BIO_ctrl_get_write_guarantee(BIO *bio) + { + return BIO_ctrl(bio, BIO_C_GET_WRITE_GUARANTEE, 0, NULL); + } + +size_t BIO_ctrl_get_read_request(BIO *bio) + { + return BIO_ctrl(bio, BIO_C_GET_READ_REQUEST, 0, NULL); + } + +int BIO_ctrl_reset_read_request(BIO *bio) + { + return (BIO_ctrl(bio, BIO_C_RESET_READ_REQUEST, 0, NULL) != 0); + } + + +/* BIO_nread0/nread/nwrite0/nwrite are available only for BIO pairs for now + * (conceivably some other BIOs could allow non-copying reads and writes too.) + */ +int BIO_nread0(BIO *bio, char **buf) + { + long ret; + + if (!bio->init) + { + BIOerr(BIO_F_BIO_NREAD0, BIO_R_UNINITIALIZED); + return -2; + } + + ret = BIO_ctrl(bio, BIO_C_NREAD0, 0, buf); + if (ret > INT_MAX) + return INT_MAX; + else + return (int) ret; + } + +int BIO_nread(BIO *bio, char **buf, int num) + { + int ret; + + if (!bio->init) + { + BIOerr(BIO_F_BIO_NREAD, BIO_R_UNINITIALIZED); + return -2; + } + + ret = (int) BIO_ctrl(bio, BIO_C_NREAD, num, buf); + if (ret > 0) + bio->num_read += ret; + return ret; + } + +int BIO_nwrite0(BIO *bio, char **buf) + { + long ret; + + if (!bio->init) + { + BIOerr(BIO_F_BIO_NWRITE0, BIO_R_UNINITIALIZED); + return -2; + } + + ret = BIO_ctrl(bio, BIO_C_NWRITE0, 0, buf); + if (ret > INT_MAX) + return INT_MAX; + else + return (int) ret; + } + +int BIO_nwrite(BIO *bio, char **buf, int num) + { + int ret; + + if (!bio->init) + { + BIOerr(BIO_F_BIO_NWRITE, BIO_R_UNINITIALIZED); + return -2; + } + + ret = BIO_ctrl(bio, BIO_C_NWRITE, num, buf); + if (ret > 0) + bio->num_write += ret; + return ret; + } |