| /* 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" |
| |
| |
| BSSL_NAMESPACE_BEGIN |
| |
| 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; |
| } |
| |
| if (!tls_flush_pending_hs_data(ssl)) { |
| return -1; |
| } |
| 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 (!tls_append_handshake_data(ssl, body)) { |
| *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) { |
| if (ssl->ctx->quic_method) { |
| if (!ssl->ctx->quic_method->send_alert(ssl, ssl->s3->write_level, |
| ssl->s3->send_alert[1])) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_QUIC_INTERNAL_ERROR); |
| return 0; |
| } |
| } else { |
| 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.get()); |
| } |
| |
| 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; |
| } |
| |
| BSSL_NAMESPACE_END |