From 1e4884f615b20946411a74e41eb9c6aa65e2d5f3 Mon Sep 17 00:00:00 2001 From: Adam Langley Date: Thu, 24 Sep 2015 10:57:52 -0700 Subject: external/boringssl: sync with upstream. This change imports the current version of BoringSSL. The only local change now is that |BORINGSSL_201509| is defined in base.h. This allows this change to be made without (hopefully) breaking the build. This change will need https://android-review.googlesource.com/172744 to be landed afterwards to update a test. Change-Id: I6d1f463f7785a2423bd846305af91c973c326104 --- src/ssl/tls_record.c | 338 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 338 insertions(+) create mode 100644 src/ssl/tls_record.c (limited to 'src/ssl/tls_record.c') diff --git a/src/ssl/tls_record.c b/src/ssl/tls_record.c new file mode 100644 index 0000000..36e31b4 --- /dev/null +++ b/src/ssl/tls_record.c @@ -0,0 +1,338 @@ +/* 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 + +#include + +#include +#include + +#include "internal.h" + + +/* kMaxEmptyRecords is the number of consecutive, empty records that will be + * processed. Without this limit an attacker could send empty records at a + * faster rate than we can process and cause record processing to loop + * forever. */ +static const uint8_t kMaxEmptyRecords = 32; + +size_t ssl_record_prefix_len(const SSL *ssl) { + if (SSL_IS_DTLS(ssl)) { + return DTLS1_RT_HEADER_LENGTH + + SSL_AEAD_CTX_explicit_nonce_len(ssl->aead_read_ctx); + } else { + return SSL3_RT_HEADER_LENGTH + + SSL_AEAD_CTX_explicit_nonce_len(ssl->aead_read_ctx); + } +} + +size_t ssl_seal_prefix_len(const SSL *ssl) { + if (SSL_IS_DTLS(ssl)) { + return DTLS1_RT_HEADER_LENGTH + + SSL_AEAD_CTX_explicit_nonce_len(ssl->aead_write_ctx); + } else { + size_t ret = SSL3_RT_HEADER_LENGTH + + SSL_AEAD_CTX_explicit_nonce_len(ssl->aead_write_ctx); + if (ssl->s3->need_record_splitting) { + ret += SSL3_RT_HEADER_LENGTH; + ret += ssl_cipher_get_record_split_len(ssl->aead_write_ctx->cipher); + } + return ret; + } +} + +size_t ssl_max_seal_overhead(const SSL *ssl) { + if (SSL_IS_DTLS(ssl)) { + return DTLS1_RT_HEADER_LENGTH + + SSL_AEAD_CTX_max_overhead(ssl->aead_write_ctx); + } else { + size_t ret = SSL3_RT_HEADER_LENGTH + + SSL_AEAD_CTX_max_overhead(ssl->aead_write_ctx); + if (ssl->s3->need_record_splitting) { + ret *= 2; + } + return ret; + } +} + +enum ssl_open_record_t tls_open_record( + SSL *ssl, uint8_t *out_type, uint8_t *out, size_t *out_len, + size_t *out_consumed, uint8_t *out_alert, size_t max_out, const uint8_t *in, + size_t in_len) { + CBS cbs; + CBS_init(&cbs, in, in_len); + + /* Decode the record header. */ + uint8_t type; + uint16_t version, ciphertext_len; + if (!CBS_get_u8(&cbs, &type) || + !CBS_get_u16(&cbs, &version) || + !CBS_get_u16(&cbs, &ciphertext_len)) { + *out_consumed = SSL3_RT_HEADER_LENGTH; + return ssl_open_record_partial; + } + + /* Check the version. */ + if ((ssl->s3->have_version && version != ssl->version) || + (version >> 8) != SSL3_VERSION_MAJOR) { + OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_VERSION_NUMBER); + *out_alert = SSL_AD_PROTOCOL_VERSION; + return ssl_open_record_error; + } + + /* Check the ciphertext length. */ + size_t extra = 0; + if (ssl->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER) { + extra = SSL3_RT_MAX_EXTRA; + } + if (ciphertext_len > SSL3_RT_MAX_ENCRYPTED_LENGTH + extra) { + OPENSSL_PUT_ERROR(SSL, SSL_R_ENCRYPTED_LENGTH_TOO_LONG); + *out_alert = SSL_AD_RECORD_OVERFLOW; + return ssl_open_record_error; + } + + /* Extract the body. */ + CBS body; + if (!CBS_get_bytes(&cbs, &body, ciphertext_len)) { + *out_consumed = SSL3_RT_HEADER_LENGTH + (size_t)ciphertext_len; + return ssl_open_record_partial; + } + + if (ssl->msg_callback != NULL) { + ssl->msg_callback(0 /* read */, 0, SSL3_RT_HEADER, in, + SSL3_RT_HEADER_LENGTH, ssl, ssl->msg_callback_arg); + } + + /* Decrypt the body. */ + size_t plaintext_len; + if (!SSL_AEAD_CTX_open(ssl->aead_read_ctx, out, &plaintext_len, max_out, + type, version, ssl->s3->read_sequence, CBS_data(&body), + CBS_len(&body))) { + OPENSSL_PUT_ERROR(SSL, SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC); + *out_alert = SSL_AD_BAD_RECORD_MAC; + return ssl_open_record_error; + } + if (!ssl3_record_sequence_update(ssl->s3->read_sequence, 8)) { + *out_alert = SSL_AD_INTERNAL_ERROR; + return ssl_open_record_error; + } + + /* Check the plaintext length. */ + if (plaintext_len > SSL3_RT_MAX_PLAIN_LENGTH + extra) { + OPENSSL_PUT_ERROR(SSL, SSL_R_DATA_LENGTH_TOO_LONG); + *out_alert = SSL_AD_RECORD_OVERFLOW; + return ssl_open_record_error; + } + + /* Limit the number of consecutive empty records. */ + if (plaintext_len == 0) { + ssl->s3->empty_record_count++; + if (ssl->s3->empty_record_count > kMaxEmptyRecords) { + OPENSSL_PUT_ERROR(SSL, SSL_R_TOO_MANY_EMPTY_FRAGMENTS); + *out_alert = SSL_AD_UNEXPECTED_MESSAGE; + return ssl_open_record_error; + } + /* Apart from the limit, empty records are returned up to the caller. This + * allows the caller to reject records of the wrong type. */ + } else { + ssl->s3->empty_record_count = 0; + } + + *out_type = type; + *out_len = plaintext_len; + *out_consumed = in_len - CBS_len(&cbs); + return ssl_open_record_success; +} + +static int do_seal_record(SSL *ssl, uint8_t *out, size_t *out_len, + size_t max_out, uint8_t type, const uint8_t *in, + size_t in_len) { + if (max_out < SSL3_RT_HEADER_LENGTH) { + OPENSSL_PUT_ERROR(SSL, SSL_R_BUFFER_TOO_SMALL); + return 0; + } + /* Check the record header does not alias any part of the input. + * |SSL_AEAD_CTX_seal| will internally enforce other aliasing requirements. */ + if (in < out + SSL3_RT_HEADER_LENGTH && out < in + in_len) { + OPENSSL_PUT_ERROR(SSL, SSL_R_OUTPUT_ALIASES_INPUT); + return 0; + } + + out[0] = type; + + /* Some servers hang if initial ClientHello is larger than 256 bytes and + * record version number > TLS 1.0. */ + uint16_t wire_version = ssl->version; + if (!ssl->s3->have_version && ssl->version > SSL3_VERSION) { + wire_version = TLS1_VERSION; + } + out[1] = wire_version >> 8; + out[2] = wire_version & 0xff; + + size_t ciphertext_len; + if (!SSL_AEAD_CTX_seal(ssl->aead_write_ctx, out + SSL3_RT_HEADER_LENGTH, + &ciphertext_len, max_out - SSL3_RT_HEADER_LENGTH, + type, wire_version, ssl->s3->write_sequence, in, + in_len) || + !ssl3_record_sequence_update(ssl->s3->write_sequence, 8)) { + return 0; + } + + if (ciphertext_len >= 1 << 16) { + OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW); + return 0; + } + out[3] = ciphertext_len >> 8; + out[4] = ciphertext_len & 0xff; + + *out_len = SSL3_RT_HEADER_LENGTH + ciphertext_len; + + if (ssl->msg_callback) { + ssl->msg_callback(1 /* write */, 0, SSL3_RT_HEADER, out, + SSL3_RT_HEADER_LENGTH, ssl, ssl->msg_callback_arg); + } + + return 1; +} + +int tls_seal_record(SSL *ssl, uint8_t *out, size_t *out_len, size_t max_out, + uint8_t type, const uint8_t *in, size_t in_len) { + size_t frag_len = 0; + if (ssl->s3->need_record_splitting && type == SSL3_RT_APPLICATION_DATA && + in_len > 1) { + /* |do_seal_record| will notice if it clobbers |in[0]|, but not if it + * aliases the rest of |in|. */ + if (in + 1 <= out && out < in + in_len) { + OPENSSL_PUT_ERROR(SSL, SSL_R_OUTPUT_ALIASES_INPUT); + return 0; + } + /* Ensure |do_seal_record| does not write beyond |in[0]|. */ + size_t frag_max_out = max_out; + if (out <= in + 1 && in + 1 < out + frag_max_out) { + frag_max_out = (size_t)(in + 1 - out); + } + if (!do_seal_record(ssl, out, &frag_len, frag_max_out, type, in, 1)) { + return 0; + } + in++; + in_len--; + out += frag_len; + max_out -= frag_len; + + assert(SSL3_RT_HEADER_LENGTH + + ssl_cipher_get_record_split_len(ssl->aead_write_ctx->cipher) == + frag_len); + } + + if (!do_seal_record(ssl, out, out_len, max_out, type, in, in_len)) { + return 0; + } + *out_len += frag_len; + return 1; +} -- cgit v1.1