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- /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * 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 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 acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS 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 AUTHOR OR 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.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
- */
- /* ====================================================================
- * Copyright (c) 1998-2002 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). */
-
- #include <openssl/ssl.h>
-
- #include <assert.h>
- #include <limits.h>
- #include <string.h>
-
- #include <openssl/buf.h>
- #include <openssl/err.h>
- #include <openssl/evp.h>
- #include <openssl/mem.h>
- #include <openssl/rand.h>
-
- #include "../crypto/internal.h"
- #include "internal.h"
-
-
- static int do_ssl3_write(SSL *ssl, int type, const uint8_t *buf, unsigned len);
-
- /* ssl3_get_record reads a new input record. On success, it places it in
- * |ssl->s3->rrec| and returns one. Otherwise it returns <= 0 on error or if
- * more data is needed. */
- static int ssl3_get_record(SSL *ssl) {
- again:
- switch (ssl->s3->recv_shutdown) {
- case ssl_shutdown_none:
- break;
- case ssl_shutdown_fatal_alert:
- OPENSSL_PUT_ERROR(SSL, SSL_R_PROTOCOL_IS_SHUTDOWN);
- return -1;
- case ssl_shutdown_close_notify:
- return 0;
- }
-
- CBS body;
- uint8_t type, alert = SSL_AD_DECODE_ERROR;
- size_t consumed;
- enum ssl_open_record_t open_ret =
- tls_open_record(ssl, &type, &body, &consumed, &alert,
- ssl_read_buffer(ssl), ssl_read_buffer_len(ssl));
- if (open_ret != ssl_open_record_partial) {
- ssl_read_buffer_consume(ssl, consumed);
- }
- switch (open_ret) {
- case ssl_open_record_partial: {
- int read_ret = ssl_read_buffer_extend_to(ssl, consumed);
- if (read_ret <= 0) {
- return read_ret;
- }
- goto again;
- }
-
- case ssl_open_record_success:
- if (CBS_len(&body) > 0xffff) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
- return -1;
- }
-
- SSL3_RECORD *rr = &ssl->s3->rrec;
- rr->type = type;
- rr->length = (uint16_t)CBS_len(&body);
- rr->data = (uint8_t *)CBS_data(&body);
- return 1;
-
- case ssl_open_record_discard:
- goto again;
-
- case ssl_open_record_close_notify:
- return 0;
-
- case ssl_open_record_fatal_alert:
- return -1;
-
- case ssl_open_record_error:
- ssl3_send_alert(ssl, SSL3_AL_FATAL, alert);
- return -1;
- }
-
- assert(0);
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return -1;
- }
-
- int ssl3_write_app_data(SSL *ssl, const uint8_t *buf, int len) {
- assert(ssl_can_write(ssl));
- assert(ssl->s3->aead_write_ctx != NULL);
-
- unsigned tot, n, nw;
-
- assert(ssl->s3->wnum <= INT_MAX);
- tot = ssl->s3->wnum;
- ssl->s3->wnum = 0;
-
- /* Ensure that if we end up with a smaller value of data to write out than
- * the the original len from a write which didn't complete for non-blocking
- * I/O and also somehow ended up avoiding the check for this in
- * ssl3_write_pending/SSL_R_BAD_WRITE_RETRY as it must never be possible to
- * end up with (len-tot) as a large number that will then promptly send
- * beyond the end of the users buffer ... so we trap and report the error in
- * a way the user will notice. */
- if (len < 0 || (size_t)len < tot) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_LENGTH);
- return -1;
- }
-
- n = len - tot;
- for (;;) {
- /* max contains the maximum number of bytes that we can put into a
- * record. */
- unsigned max = ssl->max_send_fragment;
- if (n > max) {
- nw = max;
- } else {
- nw = n;
- }
-
- int ret = do_ssl3_write(ssl, SSL3_RT_APPLICATION_DATA, &buf[tot], nw);
- if (ret <= 0) {
- ssl->s3->wnum = tot;
- return ret;
- }
-
- if (ret == (int)n || (ssl->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)) {
- return tot + ret;
- }
-
- n -= ret;
- tot += ret;
- }
- }
-
- static int ssl3_write_pending(SSL *ssl, int type, const uint8_t *buf,
- unsigned int len) {
- if (ssl->s3->wpend_tot > (int)len ||
- (!(ssl->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER) &&
- ssl->s3->wpend_buf != buf) ||
- ssl->s3->wpend_type != type) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_WRITE_RETRY);
- return -1;
- }
-
- int ret = ssl_write_buffer_flush(ssl);
- if (ret <= 0) {
- return ret;
- }
- return ssl->s3->wpend_ret;
- }
-
- /* do_ssl3_write writes an SSL record of the given type. */
- static int do_ssl3_write(SSL *ssl, int type, const uint8_t *buf, unsigned len) {
- /* If there is still data from the previous record, flush it. */
- if (ssl_write_buffer_is_pending(ssl)) {
- return ssl3_write_pending(ssl, type, buf, len);
- }
-
- if (len > SSL3_RT_MAX_PLAIN_LENGTH) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return -1;
- }
-
- if (len == 0) {
- return 0;
- }
-
- size_t flight_len = 0;
- if (ssl->s3->pending_flight != NULL) {
- flight_len =
- ssl->s3->pending_flight->length - ssl->s3->pending_flight_offset;
- }
-
- size_t max_out = len + SSL_max_seal_overhead(ssl);
- if (max_out < len || max_out + flight_len < max_out) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
- return -1;
- }
- max_out += flight_len;
-
- uint8_t *out;
- size_t ciphertext_len;
- if (!ssl_write_buffer_init(ssl, &out, max_out)) {
- return -1;
- }
-
- /* Add any unflushed handshake data as a prefix. This may be a KeyUpdate
- * acknowledgment or 0-RTT key change messages. |pending_flight| must be clear
- * when data is added to |write_buffer| or it will be written in the wrong
- * order. */
- if (ssl->s3->pending_flight != NULL) {
- OPENSSL_memcpy(
- out, ssl->s3->pending_flight->data + ssl->s3->pending_flight_offset,
- flight_len);
- BUF_MEM_free(ssl->s3->pending_flight);
- ssl->s3->pending_flight = NULL;
- ssl->s3->pending_flight_offset = 0;
- }
-
- if (!tls_seal_record(ssl, out + flight_len, &ciphertext_len,
- max_out - flight_len, type, buf, len)) {
- return -1;
- }
- ssl_write_buffer_set_len(ssl, flight_len + ciphertext_len);
-
- /* Now that we've made progress on the connection, uncork KeyUpdate
- * acknowledgments. */
- ssl->s3->key_update_pending = 0;
-
- /* memorize arguments so that ssl3_write_pending can detect bad write retries
- * later */
- ssl->s3->wpend_tot = len;
- ssl->s3->wpend_buf = buf;
- ssl->s3->wpend_type = type;
- ssl->s3->wpend_ret = len;
-
- /* we now just need to write the buffer */
- return ssl3_write_pending(ssl, type, buf, len);
- }
-
- static int consume_record(SSL *ssl, uint8_t *out, int len, int peek) {
- SSL3_RECORD *rr = &ssl->s3->rrec;
-
- if (len <= 0) {
- return len;
- }
-
- if (len > (int)rr->length) {
- len = (int)rr->length;
- }
-
- OPENSSL_memcpy(out, rr->data, len);
- if (!peek) {
- rr->length -= len;
- rr->data += len;
- if (rr->length == 0) {
- /* The record has been consumed, so we may now clear the buffer. */
- ssl_read_buffer_discard(ssl);
- }
- }
- return len;
- }
-
- int ssl3_read_app_data(SSL *ssl, int *out_got_handshake, uint8_t *buf, int len,
- int peek) {
- assert(ssl_can_read(ssl));
- assert(ssl->s3->aead_read_ctx != NULL);
- *out_got_handshake = 0;
-
- ssl->method->release_current_message(ssl, 0 /* don't free buffer */);
-
- SSL3_RECORD *rr = &ssl->s3->rrec;
-
- for (;;) {
- /* A previous iteration may have read a partial handshake message. Do not
- * allow more app data in that case. */
- int has_hs_data = ssl->init_buf != NULL && ssl->init_buf->length > 0;
-
- /* Get new packet if necessary. */
- if (rr->length == 0 && !has_hs_data) {
- int ret = ssl3_get_record(ssl);
- if (ret <= 0) {
- return ret;
- }
- }
-
- if (has_hs_data || rr->type == SSL3_RT_HANDSHAKE) {
- /* If reading 0-RTT data, reject handshake data. 0-RTT data is terminated
- * by an alert. */
- if (SSL_in_init(ssl)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_RECORD);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
- return -1;
- }
-
- /* Post-handshake data prior to TLS 1.3 is always renegotiation, which we
- * never accept as a server. Otherwise |ssl3_get_message| will send
- * |SSL_R_EXCESSIVE_MESSAGE_SIZE|. */
- if (ssl->server && ssl3_protocol_version(ssl) < TLS1_3_VERSION) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_NO_RENEGOTIATION);
- OPENSSL_PUT_ERROR(SSL, SSL_R_NO_RENEGOTIATION);
- return -1;
- }
-
- /* Parse post-handshake handshake messages. */
- int ret = ssl3_get_message(ssl);
- if (ret <= 0) {
- return ret;
- }
- *out_got_handshake = 1;
- return -1;
- }
-
- const int is_early_data_read = ssl->server &&
- ssl->s3->hs != NULL &&
- ssl->s3->hs->can_early_read &&
- ssl3_protocol_version(ssl) >= TLS1_3_VERSION;
-
- /* Handle the end_of_early_data alert. */
- if (rr->type == SSL3_RT_ALERT &&
- rr->length == 2 &&
- rr->data[0] == SSL3_AL_WARNING &&
- rr->data[1] == TLS1_AD_END_OF_EARLY_DATA &&
- is_early_data_read) {
- /* Consume the record. */
- rr->length = 0;
- ssl_read_buffer_discard(ssl);
- /* Stop accepting early data. */
- ssl->s3->hs->can_early_read = 0;
- *out_got_handshake = 1;
- return -1;
- }
-
- if (rr->type != SSL3_RT_APPLICATION_DATA) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_RECORD);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
- return -1;
- }
-
- if (is_early_data_read) {
- if (rr->length > kMaxEarlyDataAccepted - ssl->s3->hs->early_data_read) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_TOO_MUCH_READ_EARLY_DATA);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE);
- return -1;
- }
-
- ssl->s3->hs->early_data_read += rr->length;
- }
-
- if (rr->length != 0) {
- return consume_record(ssl, buf, len, peek);
- }
-
- /* Discard empty records and loop again. */
- }
- }
-
- int ssl3_read_change_cipher_spec(SSL *ssl) {
- SSL3_RECORD *rr = &ssl->s3->rrec;
-
- if (rr->length == 0) {
- int ret = ssl3_get_record(ssl);
- if (ret <= 0) {
- return ret;
- }
- }
-
- if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_RECORD);
- return -1;
- }
-
- if (rr->length != 1 || rr->data[0] != SSL3_MT_CCS) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_CHANGE_CIPHER_SPEC);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
- return -1;
- }
-
- ssl_do_msg_callback(ssl, 0 /* read */, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data,
- rr->length);
-
- rr->length = 0;
- ssl_read_buffer_discard(ssl);
- return 1;
- }
-
- void ssl3_read_close_notify(SSL *ssl) {
- /* Read records until an error or close_notify. */
- while (ssl3_get_record(ssl) > 0) {
- ;
- }
- }
-
- int ssl3_read_handshake_bytes(SSL *ssl, uint8_t *buf, int len) {
- SSL3_RECORD *rr = &ssl->s3->rrec;
-
- for (;;) {
- /* Get new packet if necessary. */
- if (rr->length == 0) {
- int ret = ssl3_get_record(ssl);
- if (ret <= 0) {
- return ret;
- }
- }
-
- if (rr->type != SSL3_RT_HANDSHAKE) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_RECORD);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
- return -1;
- }
-
- if (rr->length != 0) {
- return consume_record(ssl, buf, len, 0 /* consume data */);
- }
-
- /* Discard empty records and loop again. */
- }
- }
-
- int ssl3_send_alert(SSL *ssl, int level, int desc) {
- /* It is illegal to send an alert when we've already sent a closing one. */
- if (ssl->s3->send_shutdown != ssl_shutdown_none) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_PROTOCOL_IS_SHUTDOWN);
- return -1;
- }
-
- if (level == SSL3_AL_WARNING && desc == SSL_AD_CLOSE_NOTIFY) {
- ssl->s3->send_shutdown = ssl_shutdown_close_notify;
- } else {
- assert(level == SSL3_AL_FATAL);
- ssl->s3->send_shutdown = ssl_shutdown_fatal_alert;
- }
-
- ssl->s3->alert_dispatch = 1;
- ssl->s3->send_alert[0] = level;
- ssl->s3->send_alert[1] = desc;
- if (!ssl_write_buffer_is_pending(ssl)) {
- /* Nothing is being written out, so the alert may be dispatched
- * immediately. */
- return ssl->method->dispatch_alert(ssl);
- }
-
- /* The alert will be dispatched later. */
- return -1;
- }
-
- int ssl3_dispatch_alert(SSL *ssl) {
- int ret = do_ssl3_write(ssl, SSL3_RT_ALERT, &ssl->s3->send_alert[0], 2);
- if (ret <= 0) {
- return ret;
- }
- ssl->s3->alert_dispatch = 0;
-
- /* If the alert is fatal, flush the BIO now. */
- if (ssl->s3->send_alert[0] == SSL3_AL_FATAL) {
- BIO_flush(ssl->wbio);
- }
-
- ssl_do_msg_callback(ssl, 1 /* write */, SSL3_RT_ALERT, ssl->s3->send_alert,
- 2);
-
- int alert = (ssl->s3->send_alert[0] << 8) | ssl->s3->send_alert[1];
- ssl_do_info_callback(ssl, SSL_CB_WRITE_ALERT, alert);
-
- return 1;
- }
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