--- /dev/null
+/* 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"
+
+
+namespace bssl {
+
+static int do_ssl3_write(SSL *ssl, int type, const uint8_t *in, unsigned len);
+
+int ssl3_write_app_data(SSL *ssl, bool *out_needs_handshake, const uint8_t *in,
+ int len) {
+ assert(ssl_can_write(ssl));
+ assert(!ssl->s3->aead_write_ctx->is_null_cipher());
+
+ *out_needs_handshake = false;
+
+ if (ssl->s3->write_shutdown != ssl_shutdown_none) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_PROTOCOL_IS_SHUTDOWN);
+ return -1;
+ }
+
+ 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;
+ }
+
+ const int is_early_data_write =
+ !ssl->server && SSL_in_early_data(ssl) && ssl->s3->hs->can_early_write;
+
+ 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 (is_early_data_write && max > ssl->session->ticket_max_early_data -
+ ssl->s3->hs->early_data_written) {
+ max = ssl->session->ticket_max_early_data - ssl->s3->hs->early_data_written;
+ if (max == 0) {
+ ssl->s3->wnum = tot;
+ ssl->s3->hs->can_early_write = false;
+ *out_needs_handshake = true;
+ return -1;
+ }
+ }
+
+ if (n > max) {
+ nw = max;
+ } else {
+ nw = n;
+ }
+
+ int ret = do_ssl3_write(ssl, SSL3_RT_APPLICATION_DATA, &in[tot], nw);
+ if (ret <= 0) {
+ ssl->s3->wnum = tot;
+ return ret;
+ }
+
+ if (is_early_data_write) {
+ ssl->s3->hs->early_data_written += 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 *in,
+ unsigned int len) {
+ if (ssl->s3->wpend_tot > (int)len ||
+ (!(ssl->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER) &&
+ ssl->s3->wpend_buf != in) ||
+ 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;
+ }
+ ssl->s3->wpend_pending = false;
+ 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 *in, unsigned len) {
+ // If there is still data from the previous record, flush it.
+ if (ssl->s3->wpend_pending) {
+ return ssl3_write_pending(ssl, type, in, len);
+ }
+
+ SSLBuffer *buf = &ssl->s3->write_buffer;
+ if (len > SSL3_RT_MAX_PLAIN_LENGTH || buf->size() > 0) {
+ 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 != nullptr) {
+ 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;
+
+ if (!buf->EnsureCap(flight_len + ssl_seal_align_prefix_len(ssl), 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 != nullptr) {
+ OPENSSL_memcpy(
+ buf->remaining().data(),
+ ssl->s3->pending_flight->data + ssl->s3->pending_flight_offset,
+ flight_len);
+ ssl->s3->pending_flight.reset();
+ ssl->s3->pending_flight_offset = 0;
+ buf->DidWrite(flight_len);
+ }
+
+ size_t ciphertext_len;
+ if (!tls_seal_record(ssl, buf->remaining().data(), &ciphertext_len,
+ buf->remaining().size(), type, in, len)) {
+ return -1;
+ }
+ buf->DidWrite(ciphertext_len);
+
+ // Now that we've made progress on the connection, uncork KeyUpdate
+ // acknowledgments.
+ ssl->s3->key_update_pending = false;
+
+ // Memorize arguments so that ssl3_write_pending can detect bad write retries
+ // later.
+ ssl->s3->wpend_tot = len;
+ ssl->s3->wpend_buf = in;
+ ssl->s3->wpend_type = type;
+ ssl->s3->wpend_ret = len;
+ ssl->s3->wpend_pending = true;
+
+ // We now just need to write the buffer.
+ return ssl3_write_pending(ssl, type, in, len);
+}
+
+ssl_open_record_t ssl3_open_app_data(SSL *ssl, Span<uint8_t> *out,
+ size_t *out_consumed, uint8_t *out_alert,
+ Span<uint8_t> in) {
+ assert(ssl_can_read(ssl));
+ assert(!ssl->s3->aead_read_ctx->is_null_cipher());
+
+ uint8_t type;
+ Span<uint8_t> body;
+ auto ret = tls_open_record(ssl, &type, &body, out_consumed, out_alert, in);
+ if (ret != ssl_open_record_success) {
+ return ret;
+ }
+
+ const bool is_early_data_read = ssl->server && SSL_in_early_data(ssl);
+
+ if (type == SSL3_RT_HANDSHAKE) {
+ // 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 && ssl_protocol_version(ssl) < TLS1_3_VERSION) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_NO_RENEGOTIATION);
+ *out_alert = SSL_AD_NO_RENEGOTIATION;
+ return ssl_open_record_error;
+ }
+
+ if (!ssl->s3->hs_buf) {
+ ssl->s3->hs_buf.reset(BUF_MEM_new());
+ }
+ if (!ssl->s3->hs_buf ||
+ !BUF_MEM_append(ssl->s3->hs_buf.get(), body.data(), body.size())) {
+ *out_alert = SSL_AD_INTERNAL_ERROR;
+ return ssl_open_record_error;
+ }
+ return ssl_open_record_discard;
+ }
+
+ if (type != SSL3_RT_APPLICATION_DATA) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_RECORD);
+ *out_alert = SSL_AD_UNEXPECTED_MESSAGE;
+ return ssl_open_record_error;
+ }
+
+ if (is_early_data_read) {
+ if (body.size() > kMaxEarlyDataAccepted - ssl->s3->hs->early_data_read) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_TOO_MUCH_READ_EARLY_DATA);
+ *out_alert = SSL3_AD_UNEXPECTED_MESSAGE;
+ return ssl_open_record_error;
+ }
+
+ ssl->s3->hs->early_data_read += body.size();
+ }
+
+ if (body.empty()) {
+ return ssl_open_record_discard;
+ }
+
+ *out = body;
+ return ssl_open_record_success;
+}
+
+ssl_open_record_t ssl3_open_change_cipher_spec(SSL *ssl, size_t *out_consumed,
+ uint8_t *out_alert,
+ Span<uint8_t> in) {
+ uint8_t type;
+ Span<uint8_t> body;
+ auto ret = tls_open_record(ssl, &type, &body, out_consumed, out_alert, in);
+ if (ret != ssl_open_record_success) {
+ return ret;
+ }
+
+ if (type != SSL3_RT_CHANGE_CIPHER_SPEC) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_RECORD);
+ *out_alert = SSL_AD_UNEXPECTED_MESSAGE;
+ return ssl_open_record_error;
+ }
+
+ if (body.size() != 1 || body[0] != SSL3_MT_CCS) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_CHANGE_CIPHER_SPEC);
+ *out_alert = SSL_AD_ILLEGAL_PARAMETER;
+ return ssl_open_record_error;
+ }
+
+ ssl_do_msg_callback(ssl, 0 /* read */, SSL3_RT_CHANGE_CIPHER_SPEC, body);
+ return ssl_open_record_success;
+}
+
+int ssl_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->write_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->write_shutdown = ssl_shutdown_close_notify;
+ } else {
+ assert(level == SSL3_AL_FATAL);
+ assert(desc != SSL_AD_CLOSE_NOTIFY);
+ ssl->s3->write_shutdown = ssl_shutdown_error;
+ }
+
+ ssl->s3->alert_dispatch = 1;
+ ssl->s3->send_alert[0] = level;
+ ssl->s3->send_alert[1] = desc;
+ if (ssl->s3->write_buffer.empty()) {
+ // 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);
+
+ 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;
+}
+
+} // namespace bssl
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