470 lines
17 KiB
Plaintext
470 lines
17 KiB
Plaintext
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/* ====================================================================
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* Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com). */
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#include <openssl_grpc/ssl.h>
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#include <assert.h>
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#include <limits.h>
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#include <string.h>
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#include <algorithm>
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#include <openssl_grpc/err.h>
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#include <openssl_grpc/evp.h>
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#include <openssl_grpc/mem.h>
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#include <openssl_grpc/rand.h>
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#include "../crypto/err/internal.h"
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#include "../crypto/internal.h"
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#include "internal.h"
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BSSL_NAMESPACE_BEGIN
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static int do_tls_write(SSL *ssl, size_t *out_bytes_written, uint8_t type,
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Span<const uint8_t> in);
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int tls_write_app_data(SSL *ssl, bool *out_needs_handshake,
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size_t *out_bytes_written, Span<const uint8_t> in) {
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assert(ssl_can_write(ssl));
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assert(!ssl->s3->aead_write_ctx->is_null_cipher());
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*out_needs_handshake = false;
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if (ssl->s3->write_shutdown != ssl_shutdown_none) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_PROTOCOL_IS_SHUTDOWN);
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return -1;
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}
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size_t total_bytes_written = ssl->s3->unreported_bytes_written;
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if (in.size() < total_bytes_written) {
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// This can happen if the caller disables |SSL_MODE_ENABLE_PARTIAL_WRITE|,
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// asks us to write some input of length N, we successfully encrypt M bytes
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// and write it, but fail to write the rest. We will report
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// |SSL_ERROR_WANT_WRITE|. If the caller then retries with fewer than M
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// bytes, we cannot satisfy that request. The caller is required to always
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// retry with at least as many bytes as the previous attempt.
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OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_LENGTH);
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return -1;
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}
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in = in.subspan(total_bytes_written);
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const bool is_early_data_write =
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!ssl->server && SSL_in_early_data(ssl) && ssl->s3->hs->can_early_write;
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for (;;) {
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size_t max_send_fragment = ssl->max_send_fragment;
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if (is_early_data_write) {
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SSL_HANDSHAKE *hs = ssl->s3->hs.get();
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if (hs->early_data_written >= hs->early_session->ticket_max_early_data) {
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ssl->s3->unreported_bytes_written = total_bytes_written;
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hs->can_early_write = false;
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*out_needs_handshake = true;
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return -1;
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}
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max_send_fragment = std::min(
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max_send_fragment, size_t{hs->early_session->ticket_max_early_data -
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hs->early_data_written});
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}
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const size_t to_write = std::min(max_send_fragment, in.size());
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size_t bytes_written;
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int ret = do_tls_write(ssl, &bytes_written, SSL3_RT_APPLICATION_DATA,
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in.subspan(0, to_write));
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if (ret <= 0) {
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ssl->s3->unreported_bytes_written = total_bytes_written;
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return ret;
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}
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// Note |bytes_written| may be less than |to_write| if there was a pending
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// record from a smaller write attempt.
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assert(bytes_written <= to_write);
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total_bytes_written += bytes_written;
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in = in.subspan(bytes_written);
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if (is_early_data_write) {
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ssl->s3->hs->early_data_written += bytes_written;
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}
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if (in.empty() || (ssl->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)) {
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ssl->s3->unreported_bytes_written = 0;
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*out_bytes_written = total_bytes_written;
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return 1;
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}
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}
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}
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// do_tls_write writes an SSL record of the given type. On success, it sets
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// |*out_bytes_written| to number of bytes successfully written and returns one.
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// On error, it returns a value <= 0 from the underlying |BIO|.
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static int do_tls_write(SSL *ssl, size_t *out_bytes_written, uint8_t type,
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Span<const uint8_t> in) {
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// If there is a pending write, the retry must be consistent.
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if (!ssl->s3->pending_write.empty() &&
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(ssl->s3->pending_write.size() > in.size() ||
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(!(ssl->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER) &&
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ssl->s3->pending_write.data() != in.data()) ||
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ssl->s3->pending_write_type != type)) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_WRITE_RETRY);
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return -1;
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}
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// Flush any unwritten data to the transport. There may be data to flush even
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// if |wpend_tot| is zero.
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int ret = ssl_write_buffer_flush(ssl);
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if (ret <= 0) {
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return ret;
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}
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// If there is a pending write, we just completed it. Report it to the caller.
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if (!ssl->s3->pending_write.empty()) {
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*out_bytes_written = ssl->s3->pending_write.size();
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ssl->s3->pending_write = {};
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return 1;
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}
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SSLBuffer *buf = &ssl->s3->write_buffer;
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if (in.size() > SSL3_RT_MAX_PLAIN_LENGTH || buf->size() > 0) {
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OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
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return -1;
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}
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if (!tls_flush_pending_hs_data(ssl)) {
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return -1;
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}
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// We may have unflushed handshake data that must be written before |in|. This
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// may be a KeyUpdate acknowledgment, 0-RTT key change messages, or a
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// NewSessionTicket.
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Span<const uint8_t> pending_flight;
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if (ssl->s3->pending_flight != nullptr) {
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pending_flight = MakeConstSpan(
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reinterpret_cast<const uint8_t *>(ssl->s3->pending_flight->data),
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ssl->s3->pending_flight->length);
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pending_flight = pending_flight.subspan(ssl->s3->pending_flight_offset);
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}
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size_t max_out = pending_flight.size();
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if (!in.empty()) {
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const size_t max_ciphertext_len = in.size() + SSL_max_seal_overhead(ssl);
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if (max_ciphertext_len < in.size() ||
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max_out + max_ciphertext_len < max_out) {
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OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
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return -1;
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}
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max_out += max_ciphertext_len;
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}
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if (max_out == 0) {
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// Nothing to write.
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*out_bytes_written = 0;
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return 1;
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}
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if (!buf->EnsureCap(pending_flight.size() + ssl_seal_align_prefix_len(ssl),
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max_out)) {
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return -1;
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}
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// Copy |pending_flight| to the output.
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if (!pending_flight.empty()) {
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OPENSSL_memcpy(buf->remaining().data(), pending_flight.data(),
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pending_flight.size());
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ssl->s3->pending_flight.reset();
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ssl->s3->pending_flight_offset = 0;
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buf->DidWrite(pending_flight.size());
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}
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if (!in.empty()) {
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size_t ciphertext_len;
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if (!tls_seal_record(ssl, buf->remaining().data(), &ciphertext_len,
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buf->remaining().size(), type, in.data(), in.size())) {
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return -1;
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}
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buf->DidWrite(ciphertext_len);
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}
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// Now that we've made progress on the connection, uncork KeyUpdate
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// acknowledgments.
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ssl->s3->key_update_pending = false;
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// Flush the write buffer.
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ret = ssl_write_buffer_flush(ssl);
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if (ret <= 0) {
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// Track the unfinished write.
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if (!in.empty()) {
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ssl->s3->pending_write = in;
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ssl->s3->pending_write_type = type;
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}
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return ret;
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}
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*out_bytes_written = in.size();
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return 1;
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}
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ssl_open_record_t tls_open_app_data(SSL *ssl, Span<uint8_t> *out,
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size_t *out_consumed, uint8_t *out_alert,
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Span<uint8_t> in) {
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assert(ssl_can_read(ssl));
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assert(!ssl->s3->aead_read_ctx->is_null_cipher());
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uint8_t type;
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Span<uint8_t> body;
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auto ret = tls_open_record(ssl, &type, &body, out_consumed, out_alert, in);
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if (ret != ssl_open_record_success) {
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return ret;
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}
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const bool is_early_data_read = ssl->server && SSL_in_early_data(ssl);
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if (type == SSL3_RT_HANDSHAKE) {
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// Post-handshake data prior to TLS 1.3 is always renegotiation, which we
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// never accept as a server. Otherwise |tls_get_message| will send
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// |SSL_R_EXCESSIVE_MESSAGE_SIZE|.
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if (ssl->server && ssl_protocol_version(ssl) < TLS1_3_VERSION) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_NO_RENEGOTIATION);
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*out_alert = SSL_AD_NO_RENEGOTIATION;
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return ssl_open_record_error;
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}
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if (!tls_append_handshake_data(ssl, body)) {
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*out_alert = SSL_AD_INTERNAL_ERROR;
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return ssl_open_record_error;
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}
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return ssl_open_record_discard;
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}
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if (type != SSL3_RT_APPLICATION_DATA) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_RECORD);
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*out_alert = SSL_AD_UNEXPECTED_MESSAGE;
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return ssl_open_record_error;
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}
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if (is_early_data_read) {
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if (body.size() > kMaxEarlyDataAccepted - ssl->s3->hs->early_data_read) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_TOO_MUCH_READ_EARLY_DATA);
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*out_alert = SSL3_AD_UNEXPECTED_MESSAGE;
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return ssl_open_record_error;
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}
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ssl->s3->hs->early_data_read += body.size();
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}
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if (body.empty()) {
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return ssl_open_record_discard;
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}
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*out = body;
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return ssl_open_record_success;
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}
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ssl_open_record_t tls_open_change_cipher_spec(SSL *ssl, size_t *out_consumed,
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uint8_t *out_alert,
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Span<uint8_t> in) {
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uint8_t type;
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Span<uint8_t> body;
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auto ret = tls_open_record(ssl, &type, &body, out_consumed, out_alert, in);
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if (ret != ssl_open_record_success) {
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return ret;
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}
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if (type != SSL3_RT_CHANGE_CIPHER_SPEC) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_RECORD);
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*out_alert = SSL_AD_UNEXPECTED_MESSAGE;
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return ssl_open_record_error;
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}
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if (body.size() != 1 || body[0] != SSL3_MT_CCS) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_CHANGE_CIPHER_SPEC);
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*out_alert = SSL_AD_ILLEGAL_PARAMETER;
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return ssl_open_record_error;
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}
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ssl_do_msg_callback(ssl, 0 /* read */, SSL3_RT_CHANGE_CIPHER_SPEC, body);
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return ssl_open_record_success;
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}
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void ssl_send_alert(SSL *ssl, int level, int desc) {
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// This function is called in response to a fatal error from the peer. Ignore
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// any failures writing the alert and report only the original error. In
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// particular, if the transport uses |SSL_write|, our existing error will be
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// clobbered so we must save and restore the error queue. See
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// https://crbug.com/959305.
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//
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// TODO(davidben): Return the alert out of the handshake, rather than calling
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// this function internally everywhere.
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//
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// TODO(davidben): This does not allow retrying if the alert hit EAGAIN. See
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// https://crbug.com/boringssl/130.
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UniquePtr<ERR_SAVE_STATE> err_state(ERR_save_state());
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ssl_send_alert_impl(ssl, level, desc);
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ERR_restore_state(err_state.get());
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}
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int ssl_send_alert_impl(SSL *ssl, int level, int desc) {
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// It is illegal to send an alert when we've already sent a closing one.
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if (ssl->s3->write_shutdown != ssl_shutdown_none) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_PROTOCOL_IS_SHUTDOWN);
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return -1;
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}
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if (level == SSL3_AL_WARNING && desc == SSL_AD_CLOSE_NOTIFY) {
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ssl->s3->write_shutdown = ssl_shutdown_close_notify;
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} else {
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assert(level == SSL3_AL_FATAL);
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assert(desc != SSL_AD_CLOSE_NOTIFY);
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ssl->s3->write_shutdown = ssl_shutdown_error;
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}
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ssl->s3->alert_dispatch = true;
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ssl->s3->send_alert[0] = level;
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ssl->s3->send_alert[1] = desc;
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if (ssl->s3->write_buffer.empty()) {
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// Nothing is being written out, so the alert may be dispatched
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// immediately.
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return ssl->method->dispatch_alert(ssl);
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}
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// The alert will be dispatched later.
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return -1;
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}
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int tls_dispatch_alert(SSL *ssl) {
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if (ssl->quic_method) {
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if (!ssl->quic_method->send_alert(ssl, ssl->s3->write_level,
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ssl->s3->send_alert[1])) {
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OPENSSL_PUT_ERROR(SSL, SSL_R_QUIC_INTERNAL_ERROR);
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return 0;
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}
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} else {
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size_t bytes_written;
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int ret =
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do_tls_write(ssl, &bytes_written, SSL3_RT_ALERT, ssl->s3->send_alert);
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if (ret <= 0) {
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return ret;
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}
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assert(bytes_written == 2);
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}
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ssl->s3->alert_dispatch = false;
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// 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
|