4275ee389b
Ensure we check for a NULL return from OPENSSL_malloc Issue reported by Guido Vranken. Reviewed-by: Richard Levitte <levitte@openssl.org>
2706 lines
89 KiB
C
2706 lines
89 KiB
C
/* ssl/t1_lib.c */
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/* 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) 1998-2007 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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*
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*/
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#include <stdio.h>
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#include <openssl/objects.h>
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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#include <openssl/ocsp.h>
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#include <openssl/rand.h>
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#include "ssl_locl.h"
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const char tls1_version_str[] = "TLSv1" OPENSSL_VERSION_PTEXT;
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#ifndef OPENSSL_NO_TLSEXT
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static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
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const unsigned char *sess_id, int sesslen,
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SSL_SESSION **psess);
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#endif
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SSL3_ENC_METHOD TLSv1_enc_data = {
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tls1_enc,
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tls1_mac,
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tls1_setup_key_block,
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tls1_generate_master_secret,
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tls1_change_cipher_state,
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tls1_final_finish_mac,
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TLS1_FINISH_MAC_LENGTH,
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tls1_cert_verify_mac,
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TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
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TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
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tls1_alert_code,
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tls1_export_keying_material,
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};
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long tls1_default_timeout(void)
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{
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/*
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* 2 hours, the 24 hours mentioned in the TLSv1 spec is way too long for
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* http, the cache would over fill
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*/
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return (60 * 60 * 2);
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}
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int tls1_new(SSL *s)
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{
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if (!ssl3_new(s))
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return (0);
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s->method->ssl_clear(s);
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return (1);
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}
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void tls1_free(SSL *s)
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{
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#ifndef OPENSSL_NO_TLSEXT
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if (s->tlsext_session_ticket) {
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OPENSSL_free(s->tlsext_session_ticket);
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}
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#endif /* OPENSSL_NO_TLSEXT */
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ssl3_free(s);
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}
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void tls1_clear(SSL *s)
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{
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ssl3_clear(s);
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s->version = s->method->version;
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}
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#ifndef OPENSSL_NO_EC
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static int nid_list[] = {
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NID_sect163k1, /* sect163k1 (1) */
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NID_sect163r1, /* sect163r1 (2) */
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NID_sect163r2, /* sect163r2 (3) */
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NID_sect193r1, /* sect193r1 (4) */
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NID_sect193r2, /* sect193r2 (5) */
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NID_sect233k1, /* sect233k1 (6) */
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NID_sect233r1, /* sect233r1 (7) */
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NID_sect239k1, /* sect239k1 (8) */
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NID_sect283k1, /* sect283k1 (9) */
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NID_sect283r1, /* sect283r1 (10) */
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NID_sect409k1, /* sect409k1 (11) */
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NID_sect409r1, /* sect409r1 (12) */
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NID_sect571k1, /* sect571k1 (13) */
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NID_sect571r1, /* sect571r1 (14) */
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NID_secp160k1, /* secp160k1 (15) */
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NID_secp160r1, /* secp160r1 (16) */
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NID_secp160r2, /* secp160r2 (17) */
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NID_secp192k1, /* secp192k1 (18) */
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NID_X9_62_prime192v1, /* secp192r1 (19) */
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NID_secp224k1, /* secp224k1 (20) */
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NID_secp224r1, /* secp224r1 (21) */
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NID_secp256k1, /* secp256k1 (22) */
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NID_X9_62_prime256v1, /* secp256r1 (23) */
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NID_secp384r1, /* secp384r1 (24) */
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NID_secp521r1 /* secp521r1 (25) */
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};
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static int pref_list[] = {
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# ifndef OPENSSL_NO_EC2M
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NID_sect571r1, /* sect571r1 (14) */
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NID_sect571k1, /* sect571k1 (13) */
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# endif
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NID_secp521r1, /* secp521r1 (25) */
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# ifndef OPENSSL_NO_EC2M
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NID_sect409k1, /* sect409k1 (11) */
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NID_sect409r1, /* sect409r1 (12) */
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# endif
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NID_secp384r1, /* secp384r1 (24) */
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# ifndef OPENSSL_NO_EC2M
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NID_sect283k1, /* sect283k1 (9) */
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NID_sect283r1, /* sect283r1 (10) */
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# endif
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NID_secp256k1, /* secp256k1 (22) */
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NID_X9_62_prime256v1, /* secp256r1 (23) */
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# ifndef OPENSSL_NO_EC2M
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NID_sect239k1, /* sect239k1 (8) */
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NID_sect233k1, /* sect233k1 (6) */
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NID_sect233r1, /* sect233r1 (7) */
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# endif
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NID_secp224k1, /* secp224k1 (20) */
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NID_secp224r1, /* secp224r1 (21) */
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# ifndef OPENSSL_NO_EC2M
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NID_sect193r1, /* sect193r1 (4) */
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NID_sect193r2, /* sect193r2 (5) */
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# endif
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NID_secp192k1, /* secp192k1 (18) */
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NID_X9_62_prime192v1, /* secp192r1 (19) */
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# ifndef OPENSSL_NO_EC2M
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NID_sect163k1, /* sect163k1 (1) */
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NID_sect163r1, /* sect163r1 (2) */
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NID_sect163r2, /* sect163r2 (3) */
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# endif
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NID_secp160k1, /* secp160k1 (15) */
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NID_secp160r1, /* secp160r1 (16) */
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NID_secp160r2, /* secp160r2 (17) */
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};
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int tls1_ec_curve_id2nid(int curve_id)
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{
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/* ECC curves from RFC 4492 */
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if ((curve_id < 1) || ((unsigned int)curve_id >
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sizeof(nid_list) / sizeof(nid_list[0])))
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return 0;
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return nid_list[curve_id - 1];
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}
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int tls1_ec_nid2curve_id(int nid)
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{
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/* ECC curves from RFC 4492 */
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switch (nid) {
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case NID_sect163k1: /* sect163k1 (1) */
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return 1;
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case NID_sect163r1: /* sect163r1 (2) */
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return 2;
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case NID_sect163r2: /* sect163r2 (3) */
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return 3;
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case NID_sect193r1: /* sect193r1 (4) */
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return 4;
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case NID_sect193r2: /* sect193r2 (5) */
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return 5;
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case NID_sect233k1: /* sect233k1 (6) */
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return 6;
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case NID_sect233r1: /* sect233r1 (7) */
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return 7;
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case NID_sect239k1: /* sect239k1 (8) */
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return 8;
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case NID_sect283k1: /* sect283k1 (9) */
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return 9;
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case NID_sect283r1: /* sect283r1 (10) */
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return 10;
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case NID_sect409k1: /* sect409k1 (11) */
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return 11;
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case NID_sect409r1: /* sect409r1 (12) */
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return 12;
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case NID_sect571k1: /* sect571k1 (13) */
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return 13;
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case NID_sect571r1: /* sect571r1 (14) */
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return 14;
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case NID_secp160k1: /* secp160k1 (15) */
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return 15;
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case NID_secp160r1: /* secp160r1 (16) */
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return 16;
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case NID_secp160r2: /* secp160r2 (17) */
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return 17;
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case NID_secp192k1: /* secp192k1 (18) */
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return 18;
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case NID_X9_62_prime192v1: /* secp192r1 (19) */
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return 19;
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case NID_secp224k1: /* secp224k1 (20) */
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return 20;
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case NID_secp224r1: /* secp224r1 (21) */
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return 21;
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case NID_secp256k1: /* secp256k1 (22) */
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return 22;
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case NID_X9_62_prime256v1: /* secp256r1 (23) */
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return 23;
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case NID_secp384r1: /* secp384r1 (24) */
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return 24;
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case NID_secp521r1: /* secp521r1 (25) */
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return 25;
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default:
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return 0;
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}
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}
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#endif /* OPENSSL_NO_EC */
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#ifndef OPENSSL_NO_TLSEXT
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/*
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* List of supported signature algorithms and hashes. Should make this
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* customisable at some point, for now include everything we support.
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*/
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# ifdef OPENSSL_NO_RSA
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# define tlsext_sigalg_rsa(md) /* */
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# else
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# define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa,
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# endif
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# ifdef OPENSSL_NO_DSA
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# define tlsext_sigalg_dsa(md) /* */
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# else
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# define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa,
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# endif
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# ifdef OPENSSL_NO_ECDSA
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# define tlsext_sigalg_ecdsa(md)
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/* */
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# else
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# define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa,
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# endif
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# define tlsext_sigalg(md) \
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tlsext_sigalg_rsa(md) \
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tlsext_sigalg_dsa(md) \
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tlsext_sigalg_ecdsa(md)
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static unsigned char tls12_sigalgs[] = {
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# ifndef OPENSSL_NO_SHA512
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tlsext_sigalg(TLSEXT_hash_sha512)
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tlsext_sigalg(TLSEXT_hash_sha384)
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# endif
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# ifndef OPENSSL_NO_SHA256
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tlsext_sigalg(TLSEXT_hash_sha256)
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tlsext_sigalg(TLSEXT_hash_sha224)
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# endif
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# ifndef OPENSSL_NO_SHA
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tlsext_sigalg(TLSEXT_hash_sha1)
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# endif
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};
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int tls12_get_req_sig_algs(SSL *s, unsigned char *p)
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{
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size_t slen = sizeof(tls12_sigalgs);
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if (p)
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memcpy(p, tls12_sigalgs, slen);
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return (int)slen;
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}
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unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *buf,
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unsigned char *limit)
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{
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int extdatalen = 0;
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unsigned char *orig = buf;
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unsigned char *ret = buf;
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/* don't add extensions for SSLv3 unless doing secure renegotiation */
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if (s->client_version == SSL3_VERSION && !s->s3->send_connection_binding)
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return orig;
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ret += 2;
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if (ret >= limit)
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return NULL; /* this really never occurs, but ... */
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if (s->tlsext_hostname != NULL) {
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/* Add TLS extension servername to the Client Hello message */
|
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unsigned long size_str;
|
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long lenmax;
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|
|
|
/*-
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* check for enough space.
|
|
* 4 for the servername type and entension length
|
|
* 2 for servernamelist length
|
|
* 1 for the hostname type
|
|
* 2 for hostname length
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* + hostname length
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|
*/
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if ((lenmax = limit - ret - 9) < 0
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|| (size_str =
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strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
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return NULL;
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/* extension type and length */
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s2n(TLSEXT_TYPE_server_name, ret);
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s2n(size_str + 5, ret);
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/* length of servername list */
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s2n(size_str + 3, ret);
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/* hostname type, length and hostname */
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*(ret++) = (unsigned char)TLSEXT_NAMETYPE_host_name;
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s2n(size_str, ret);
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memcpy(ret, s->tlsext_hostname, size_str);
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ret += size_str;
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}
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/* Add RI if renegotiating */
|
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if (s->renegotiate) {
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int el;
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if (!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0)) {
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SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
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return NULL;
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}
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if ((limit - ret - 4 - el) < 0)
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return NULL;
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s2n(TLSEXT_TYPE_renegotiate, ret);
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s2n(el, ret);
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if (!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el)) {
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SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
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return NULL;
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}
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ret += el;
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}
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# ifndef OPENSSL_NO_SRP
|
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/* Add SRP username if there is one */
|
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if (s->srp_ctx.login != NULL) { /* Add TLS extension SRP username to the
|
|
* Client Hello message */
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int login_len = strlen(s->srp_ctx.login);
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if (login_len > 255 || login_len == 0) {
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SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
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return NULL;
|
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}
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|
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/*-
|
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* check for enough space.
|
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* 4 for the srp type type and entension length
|
|
* 1 for the srp user identity
|
|
* + srp user identity length
|
|
*/
|
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if ((limit - ret - 5 - login_len) < 0)
|
|
return NULL;
|
|
|
|
/* fill in the extension */
|
|
s2n(TLSEXT_TYPE_srp, ret);
|
|
s2n(login_len + 1, ret);
|
|
(*ret++) = (unsigned char)login_len;
|
|
memcpy(ret, s->srp_ctx.login, login_len);
|
|
ret += login_len;
|
|
}
|
|
# endif
|
|
|
|
# ifndef OPENSSL_NO_EC
|
|
if (s->tlsext_ecpointformatlist != NULL) {
|
|
/*
|
|
* Add TLS extension ECPointFormats to the ClientHello message
|
|
*/
|
|
long lenmax;
|
|
|
|
if ((lenmax = limit - ret - 5) < 0)
|
|
return NULL;
|
|
if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax)
|
|
return NULL;
|
|
if (s->tlsext_ecpointformatlist_length > 255) {
|
|
SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
|
|
return NULL;
|
|
}
|
|
|
|
s2n(TLSEXT_TYPE_ec_point_formats, ret);
|
|
s2n(s->tlsext_ecpointformatlist_length + 1, ret);
|
|
*(ret++) = (unsigned char)s->tlsext_ecpointformatlist_length;
|
|
memcpy(ret, s->tlsext_ecpointformatlist,
|
|
s->tlsext_ecpointformatlist_length);
|
|
ret += s->tlsext_ecpointformatlist_length;
|
|
}
|
|
if (s->tlsext_ellipticcurvelist != NULL) {
|
|
/*
|
|
* Add TLS extension EllipticCurves to the ClientHello message
|
|
*/
|
|
long lenmax;
|
|
|
|
if ((lenmax = limit - ret - 6) < 0)
|
|
return NULL;
|
|
if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax)
|
|
return NULL;
|
|
if (s->tlsext_ellipticcurvelist_length > 65532) {
|
|
SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
|
|
return NULL;
|
|
}
|
|
|
|
s2n(TLSEXT_TYPE_elliptic_curves, ret);
|
|
s2n(s->tlsext_ellipticcurvelist_length + 2, ret);
|
|
|
|
s2n(s->tlsext_ellipticcurvelist_length, ret);
|
|
memcpy(ret, s->tlsext_ellipticcurvelist,
|
|
s->tlsext_ellipticcurvelist_length);
|
|
ret += s->tlsext_ellipticcurvelist_length;
|
|
}
|
|
# endif /* OPENSSL_NO_EC */
|
|
|
|
if (!(SSL_get_options(s) & SSL_OP_NO_TICKET)) {
|
|
int ticklen;
|
|
if (!s->new_session && s->session && s->session->tlsext_tick)
|
|
ticklen = s->session->tlsext_ticklen;
|
|
else if (s->session && s->tlsext_session_ticket &&
|
|
s->tlsext_session_ticket->data) {
|
|
ticklen = s->tlsext_session_ticket->length;
|
|
s->session->tlsext_tick = OPENSSL_malloc(ticklen);
|
|
if (!s->session->tlsext_tick)
|
|
return NULL;
|
|
memcpy(s->session->tlsext_tick,
|
|
s->tlsext_session_ticket->data, ticklen);
|
|
s->session->tlsext_ticklen = ticklen;
|
|
} else
|
|
ticklen = 0;
|
|
if (ticklen == 0 && s->tlsext_session_ticket &&
|
|
s->tlsext_session_ticket->data == NULL)
|
|
goto skip_ext;
|
|
/*
|
|
* Check for enough room 2 for extension type, 2 for len rest for
|
|
* ticket
|
|
*/
|
|
if ((long)(limit - ret - 4 - ticklen) < 0)
|
|
return NULL;
|
|
s2n(TLSEXT_TYPE_session_ticket, ret);
|
|
s2n(ticklen, ret);
|
|
if (ticklen) {
|
|
memcpy(ret, s->session->tlsext_tick, ticklen);
|
|
ret += ticklen;
|
|
}
|
|
}
|
|
skip_ext:
|
|
|
|
if (TLS1_get_client_version(s) >= TLS1_2_VERSION) {
|
|
if ((size_t)(limit - ret) < sizeof(tls12_sigalgs) + 6)
|
|
return NULL;
|
|
s2n(TLSEXT_TYPE_signature_algorithms, ret);
|
|
s2n(sizeof(tls12_sigalgs) + 2, ret);
|
|
s2n(sizeof(tls12_sigalgs), ret);
|
|
memcpy(ret, tls12_sigalgs, sizeof(tls12_sigalgs));
|
|
ret += sizeof(tls12_sigalgs);
|
|
}
|
|
# ifdef TLSEXT_TYPE_opaque_prf_input
|
|
if (s->s3->client_opaque_prf_input != NULL && s->version != DTLS1_VERSION) {
|
|
size_t col = s->s3->client_opaque_prf_input_len;
|
|
|
|
if ((long)(limit - ret - 6 - col < 0))
|
|
return NULL;
|
|
if (col > 0xFFFD) /* can't happen */
|
|
return NULL;
|
|
|
|
s2n(TLSEXT_TYPE_opaque_prf_input, ret);
|
|
s2n(col + 2, ret);
|
|
s2n(col, ret);
|
|
memcpy(ret, s->s3->client_opaque_prf_input, col);
|
|
ret += col;
|
|
}
|
|
# endif
|
|
|
|
if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
|
|
s->version != DTLS1_VERSION) {
|
|
int i;
|
|
long extlen, idlen, itmp;
|
|
OCSP_RESPID *id;
|
|
|
|
idlen = 0;
|
|
for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) {
|
|
id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
|
|
itmp = i2d_OCSP_RESPID(id, NULL);
|
|
if (itmp <= 0)
|
|
return NULL;
|
|
idlen += itmp + 2;
|
|
}
|
|
|
|
if (s->tlsext_ocsp_exts) {
|
|
extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
|
|
if (extlen < 0)
|
|
return NULL;
|
|
} else
|
|
extlen = 0;
|
|
|
|
if ((long)(limit - ret - 7 - extlen - idlen) < 0)
|
|
return NULL;
|
|
s2n(TLSEXT_TYPE_status_request, ret);
|
|
if (extlen + idlen > 0xFFF0)
|
|
return NULL;
|
|
s2n(extlen + idlen + 5, ret);
|
|
*(ret++) = TLSEXT_STATUSTYPE_ocsp;
|
|
s2n(idlen, ret);
|
|
for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) {
|
|
/* save position of id len */
|
|
unsigned char *q = ret;
|
|
id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
|
|
/* skip over id len */
|
|
ret += 2;
|
|
itmp = i2d_OCSP_RESPID(id, &ret);
|
|
/* write id len */
|
|
s2n(itmp, q);
|
|
}
|
|
s2n(extlen, ret);
|
|
if (extlen > 0)
|
|
i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
|
|
}
|
|
# ifndef OPENSSL_NO_HEARTBEATS
|
|
/* Add Heartbeat extension */
|
|
if ((limit - ret - 4 - 1) < 0)
|
|
return NULL;
|
|
s2n(TLSEXT_TYPE_heartbeat, ret);
|
|
s2n(1, ret);
|
|
/*-
|
|
* Set mode:
|
|
* 1: peer may send requests
|
|
* 2: peer not allowed to send requests
|
|
*/
|
|
if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
|
|
*(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
|
|
else
|
|
*(ret++) = SSL_TLSEXT_HB_ENABLED;
|
|
# endif
|
|
|
|
# ifndef OPENSSL_NO_NEXTPROTONEG
|
|
if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len) {
|
|
/*
|
|
* The client advertises an emtpy extension to indicate its support
|
|
* for Next Protocol Negotiation
|
|
*/
|
|
if (limit - ret - 4 < 0)
|
|
return NULL;
|
|
s2n(TLSEXT_TYPE_next_proto_neg, ret);
|
|
s2n(0, ret);
|
|
}
|
|
# endif
|
|
|
|
# ifndef OPENSSL_NO_SRTP
|
|
if (SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s)) {
|
|
int el;
|
|
|
|
ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);
|
|
|
|
if ((limit - ret - 4 - el) < 0)
|
|
return NULL;
|
|
|
|
s2n(TLSEXT_TYPE_use_srtp, ret);
|
|
s2n(el, ret);
|
|
|
|
if (ssl_add_clienthello_use_srtp_ext(s, ret, &el, el)) {
|
|
SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
|
|
return NULL;
|
|
}
|
|
ret += el;
|
|
}
|
|
# endif
|
|
/*
|
|
* Add padding to workaround bugs in F5 terminators. See
|
|
* https://tools.ietf.org/html/draft-agl-tls-padding-03 NB: because this
|
|
* code works out the length of all existing extensions it MUST always
|
|
* appear last.
|
|
*/
|
|
if (s->options & SSL_OP_TLSEXT_PADDING) {
|
|
int hlen = ret - (unsigned char *)s->init_buf->data;
|
|
/*
|
|
* The code in s23_clnt.c to build ClientHello messages includes the
|
|
* 5-byte record header in the buffer, while the code in s3_clnt.c
|
|
* does not.
|
|
*/
|
|
if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
|
|
hlen -= 5;
|
|
if (hlen > 0xff && hlen < 0x200) {
|
|
hlen = 0x200 - hlen;
|
|
if (hlen >= 4)
|
|
hlen -= 4;
|
|
else
|
|
hlen = 0;
|
|
|
|
s2n(TLSEXT_TYPE_padding, ret);
|
|
s2n(hlen, ret);
|
|
memset(ret, 0, hlen);
|
|
ret += hlen;
|
|
}
|
|
}
|
|
|
|
if ((extdatalen = ret - orig - 2) == 0)
|
|
return orig;
|
|
|
|
s2n(extdatalen, orig);
|
|
return ret;
|
|
}
|
|
|
|
unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *buf,
|
|
unsigned char *limit)
|
|
{
|
|
int extdatalen = 0;
|
|
unsigned char *orig = buf;
|
|
unsigned char *ret = buf;
|
|
# ifndef OPENSSL_NO_NEXTPROTONEG
|
|
int next_proto_neg_seen;
|
|
# endif
|
|
|
|
/*
|
|
* don't add extensions for SSLv3, unless doing secure renegotiation
|
|
*/
|
|
if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
|
|
return orig;
|
|
|
|
ret += 2;
|
|
if (ret >= limit)
|
|
return NULL; /* this really never occurs, but ... */
|
|
|
|
if (!s->hit && s->servername_done == 1
|
|
&& s->session->tlsext_hostname != NULL) {
|
|
if ((long)(limit - ret - 4) < 0)
|
|
return NULL;
|
|
|
|
s2n(TLSEXT_TYPE_server_name, ret);
|
|
s2n(0, ret);
|
|
}
|
|
|
|
if (s->s3->send_connection_binding) {
|
|
int el;
|
|
|
|
if (!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0)) {
|
|
SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
|
|
return NULL;
|
|
}
|
|
|
|
if ((limit - ret - 4 - el) < 0)
|
|
return NULL;
|
|
|
|
s2n(TLSEXT_TYPE_renegotiate, ret);
|
|
s2n(el, ret);
|
|
|
|
if (!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el)) {
|
|
SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
|
|
return NULL;
|
|
}
|
|
|
|
ret += el;
|
|
}
|
|
# ifndef OPENSSL_NO_EC
|
|
if (s->tlsext_ecpointformatlist != NULL) {
|
|
/*
|
|
* Add TLS extension ECPointFormats to the ServerHello message
|
|
*/
|
|
long lenmax;
|
|
|
|
if ((lenmax = limit - ret - 5) < 0)
|
|
return NULL;
|
|
if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax)
|
|
return NULL;
|
|
if (s->tlsext_ecpointformatlist_length > 255) {
|
|
SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
|
|
return NULL;
|
|
}
|
|
|
|
s2n(TLSEXT_TYPE_ec_point_formats, ret);
|
|
s2n(s->tlsext_ecpointformatlist_length + 1, ret);
|
|
*(ret++) = (unsigned char)s->tlsext_ecpointformatlist_length;
|
|
memcpy(ret, s->tlsext_ecpointformatlist,
|
|
s->tlsext_ecpointformatlist_length);
|
|
ret += s->tlsext_ecpointformatlist_length;
|
|
|
|
}
|
|
/*
|
|
* Currently the server should not respond with a SupportedCurves
|
|
* extension
|
|
*/
|
|
# endif /* OPENSSL_NO_EC */
|
|
|
|
if (s->tlsext_ticket_expected && !(SSL_get_options(s) & SSL_OP_NO_TICKET)) {
|
|
if ((long)(limit - ret - 4) < 0)
|
|
return NULL;
|
|
s2n(TLSEXT_TYPE_session_ticket, ret);
|
|
s2n(0, ret);
|
|
}
|
|
|
|
if (s->tlsext_status_expected) {
|
|
if ((long)(limit - ret - 4) < 0)
|
|
return NULL;
|
|
s2n(TLSEXT_TYPE_status_request, ret);
|
|
s2n(0, ret);
|
|
}
|
|
# ifdef TLSEXT_TYPE_opaque_prf_input
|
|
if (s->s3->server_opaque_prf_input != NULL && s->version != DTLS1_VERSION) {
|
|
size_t sol = s->s3->server_opaque_prf_input_len;
|
|
|
|
if ((long)(limit - ret - 6 - sol) < 0)
|
|
return NULL;
|
|
if (sol > 0xFFFD) /* can't happen */
|
|
return NULL;
|
|
|
|
s2n(TLSEXT_TYPE_opaque_prf_input, ret);
|
|
s2n(sol + 2, ret);
|
|
s2n(sol, ret);
|
|
memcpy(ret, s->s3->server_opaque_prf_input, sol);
|
|
ret += sol;
|
|
}
|
|
# endif
|
|
|
|
# ifndef OPENSSL_NO_SRTP
|
|
if (SSL_IS_DTLS(s) && s->srtp_profile) {
|
|
int el;
|
|
|
|
ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
|
|
|
|
if ((limit - ret - 4 - el) < 0)
|
|
return NULL;
|
|
|
|
s2n(TLSEXT_TYPE_use_srtp, ret);
|
|
s2n(el, ret);
|
|
|
|
if (ssl_add_serverhello_use_srtp_ext(s, ret, &el, el)) {
|
|
SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
|
|
return NULL;
|
|
}
|
|
ret += el;
|
|
}
|
|
# endif
|
|
|
|
if (((s->s3->tmp.new_cipher->id & 0xFFFF) == 0x80
|
|
|| (s->s3->tmp.new_cipher->id & 0xFFFF) == 0x81)
|
|
&& (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG)) {
|
|
const unsigned char cryptopro_ext[36] = {
|
|
0xfd, 0xe8, /* 65000 */
|
|
0x00, 0x20, /* 32 bytes length */
|
|
0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
|
|
0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
|
|
0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
|
|
0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17
|
|
};
|
|
if (limit - ret < 36)
|
|
return NULL;
|
|
memcpy(ret, cryptopro_ext, 36);
|
|
ret += 36;
|
|
|
|
}
|
|
# ifndef OPENSSL_NO_HEARTBEATS
|
|
/* Add Heartbeat extension if we've received one */
|
|
if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) {
|
|
if ((limit - ret - 4 - 1) < 0)
|
|
return NULL;
|
|
s2n(TLSEXT_TYPE_heartbeat, ret);
|
|
s2n(1, ret);
|
|
/*-
|
|
* Set mode:
|
|
* 1: peer may send requests
|
|
* 2: peer not allowed to send requests
|
|
*/
|
|
if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
|
|
*(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
|
|
else
|
|
*(ret++) = SSL_TLSEXT_HB_ENABLED;
|
|
|
|
}
|
|
# endif
|
|
|
|
# ifndef OPENSSL_NO_NEXTPROTONEG
|
|
next_proto_neg_seen = s->s3->next_proto_neg_seen;
|
|
s->s3->next_proto_neg_seen = 0;
|
|
if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb) {
|
|
const unsigned char *npa;
|
|
unsigned int npalen;
|
|
int r;
|
|
|
|
r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen,
|
|
s->
|
|
ctx->next_protos_advertised_cb_arg);
|
|
if (r == SSL_TLSEXT_ERR_OK) {
|
|
if ((long)(limit - ret - 4 - npalen) < 0)
|
|
return NULL;
|
|
s2n(TLSEXT_TYPE_next_proto_neg, ret);
|
|
s2n(npalen, ret);
|
|
memcpy(ret, npa, npalen);
|
|
ret += npalen;
|
|
s->s3->next_proto_neg_seen = 1;
|
|
}
|
|
}
|
|
# endif
|
|
|
|
if ((extdatalen = ret - orig - 2) == 0)
|
|
return orig;
|
|
|
|
s2n(extdatalen, orig);
|
|
return ret;
|
|
}
|
|
|
|
# ifndef OPENSSL_NO_EC
|
|
/*-
|
|
* ssl_check_for_safari attempts to fingerprint Safari using OS X
|
|
* SecureTransport using the TLS extension block in |d|, of length |n|.
|
|
* Safari, since 10.6, sends exactly these extensions, in this order:
|
|
* SNI,
|
|
* elliptic_curves
|
|
* ec_point_formats
|
|
*
|
|
* We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8,
|
|
* but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them.
|
|
* Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from
|
|
* 10.8..10.8.3 (which don't work).
|
|
*/
|
|
static void ssl_check_for_safari(SSL *s, const unsigned char *data,
|
|
const unsigned char *limit)
|
|
{
|
|
unsigned short type, size;
|
|
static const unsigned char kSafariExtensionsBlock[] = {
|
|
0x00, 0x0a, /* elliptic_curves extension */
|
|
0x00, 0x08, /* 8 bytes */
|
|
0x00, 0x06, /* 6 bytes of curve ids */
|
|
0x00, 0x17, /* P-256 */
|
|
0x00, 0x18, /* P-384 */
|
|
0x00, 0x19, /* P-521 */
|
|
|
|
0x00, 0x0b, /* ec_point_formats */
|
|
0x00, 0x02, /* 2 bytes */
|
|
0x01, /* 1 point format */
|
|
0x00, /* uncompressed */
|
|
};
|
|
|
|
/* The following is only present in TLS 1.2 */
|
|
static const unsigned char kSafariTLS12ExtensionsBlock[] = {
|
|
0x00, 0x0d, /* signature_algorithms */
|
|
0x00, 0x0c, /* 12 bytes */
|
|
0x00, 0x0a, /* 10 bytes */
|
|
0x05, 0x01, /* SHA-384/RSA */
|
|
0x04, 0x01, /* SHA-256/RSA */
|
|
0x02, 0x01, /* SHA-1/RSA */
|
|
0x04, 0x03, /* SHA-256/ECDSA */
|
|
0x02, 0x03, /* SHA-1/ECDSA */
|
|
};
|
|
|
|
if (data >= (limit - 2))
|
|
return;
|
|
data += 2;
|
|
|
|
if (data > (limit - 4))
|
|
return;
|
|
n2s(data, type);
|
|
n2s(data, size);
|
|
|
|
if (type != TLSEXT_TYPE_server_name)
|
|
return;
|
|
|
|
if (data + size > limit)
|
|
return;
|
|
data += size;
|
|
|
|
if (TLS1_get_client_version(s) >= TLS1_2_VERSION) {
|
|
const size_t len1 = sizeof(kSafariExtensionsBlock);
|
|
const size_t len2 = sizeof(kSafariTLS12ExtensionsBlock);
|
|
|
|
if (data + len1 + len2 != limit)
|
|
return;
|
|
if (memcmp(data, kSafariExtensionsBlock, len1) != 0)
|
|
return;
|
|
if (memcmp(data + len1, kSafariTLS12ExtensionsBlock, len2) != 0)
|
|
return;
|
|
} else {
|
|
const size_t len = sizeof(kSafariExtensionsBlock);
|
|
|
|
if (data + len != limit)
|
|
return;
|
|
if (memcmp(data, kSafariExtensionsBlock, len) != 0)
|
|
return;
|
|
}
|
|
|
|
s->s3->is_probably_safari = 1;
|
|
}
|
|
# endif /* !OPENSSL_NO_EC */
|
|
|
|
int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p,
|
|
unsigned char *limit, int *al)
|
|
{
|
|
unsigned short type;
|
|
unsigned short size;
|
|
unsigned short len;
|
|
unsigned char *data = *p;
|
|
int renegotiate_seen = 0;
|
|
int sigalg_seen = 0;
|
|
|
|
s->servername_done = 0;
|
|
s->tlsext_status_type = -1;
|
|
# ifndef OPENSSL_NO_NEXTPROTONEG
|
|
s->s3->next_proto_neg_seen = 0;
|
|
# endif
|
|
|
|
# ifndef OPENSSL_NO_HEARTBEATS
|
|
s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
|
|
SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
|
|
# endif
|
|
|
|
# ifndef OPENSSL_NO_EC
|
|
if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
|
|
ssl_check_for_safari(s, data, limit);
|
|
# endif /* !OPENSSL_NO_EC */
|
|
|
|
# ifndef OPENSSL_NO_SRP
|
|
if (s->srp_ctx.login != NULL) {
|
|
OPENSSL_free(s->srp_ctx.login);
|
|
s->srp_ctx.login = NULL;
|
|
}
|
|
# endif
|
|
|
|
s->srtp_profile = NULL;
|
|
|
|
if (data == limit)
|
|
goto ri_check;
|
|
|
|
if (data > (limit - 2))
|
|
goto err;
|
|
|
|
n2s(data, len);
|
|
|
|
if (data + len != limit)
|
|
goto err;
|
|
|
|
while (data <= (limit - 4)) {
|
|
n2s(data, type);
|
|
n2s(data, size);
|
|
|
|
if (data + size > (limit))
|
|
goto err;
|
|
# if 0
|
|
fprintf(stderr, "Received extension type %d size %d\n", type, size);
|
|
# endif
|
|
if (s->tlsext_debug_cb)
|
|
s->tlsext_debug_cb(s, 0, type, data, size, s->tlsext_debug_arg);
|
|
/*-
|
|
* The servername extension is treated as follows:
|
|
*
|
|
* - Only the hostname type is supported with a maximum length of 255.
|
|
* - The servername is rejected if too long or if it contains zeros,
|
|
* in which case an fatal alert is generated.
|
|
* - The servername field is maintained together with the session cache.
|
|
* - When a session is resumed, the servername call back invoked in order
|
|
* to allow the application to position itself to the right context.
|
|
* - The servername is acknowledged if it is new for a session or when
|
|
* it is identical to a previously used for the same session.
|
|
* Applications can control the behaviour. They can at any time
|
|
* set a 'desirable' servername for a new SSL object. This can be the
|
|
* case for example with HTTPS when a Host: header field is received and
|
|
* a renegotiation is requested. In this case, a possible servername
|
|
* presented in the new client hello is only acknowledged if it matches
|
|
* the value of the Host: field.
|
|
* - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
|
|
* if they provide for changing an explicit servername context for the
|
|
* session, i.e. when the session has been established with a servername
|
|
* extension.
|
|
* - On session reconnect, the servername extension may be absent.
|
|
*
|
|
*/
|
|
|
|
if (type == TLSEXT_TYPE_server_name) {
|
|
unsigned char *sdata;
|
|
int servname_type;
|
|
int dsize;
|
|
|
|
if (size < 2)
|
|
goto err;
|
|
n2s(data, dsize);
|
|
size -= 2;
|
|
if (dsize > size)
|
|
goto err;
|
|
|
|
sdata = data;
|
|
while (dsize > 3) {
|
|
servname_type = *(sdata++);
|
|
n2s(sdata, len);
|
|
dsize -= 3;
|
|
|
|
if (len > dsize)
|
|
goto err;
|
|
|
|
if (s->servername_done == 0)
|
|
switch (servname_type) {
|
|
case TLSEXT_NAMETYPE_host_name:
|
|
if (!s->hit) {
|
|
if (s->session->tlsext_hostname)
|
|
goto err;
|
|
|
|
if (len > TLSEXT_MAXLEN_host_name) {
|
|
*al = TLS1_AD_UNRECOGNIZED_NAME;
|
|
return 0;
|
|
}
|
|
if ((s->session->tlsext_hostname =
|
|
OPENSSL_malloc(len + 1)) == NULL) {
|
|
*al = TLS1_AD_INTERNAL_ERROR;
|
|
return 0;
|
|
}
|
|
memcpy(s->session->tlsext_hostname, sdata, len);
|
|
s->session->tlsext_hostname[len] = '\0';
|
|
if (strlen(s->session->tlsext_hostname) != len) {
|
|
OPENSSL_free(s->session->tlsext_hostname);
|
|
s->session->tlsext_hostname = NULL;
|
|
*al = TLS1_AD_UNRECOGNIZED_NAME;
|
|
return 0;
|
|
}
|
|
s->servername_done = 1;
|
|
|
|
} else
|
|
s->servername_done = s->session->tlsext_hostname
|
|
&& strlen(s->session->tlsext_hostname) == len
|
|
&& strncmp(s->session->tlsext_hostname,
|
|
(char *)sdata, len) == 0;
|
|
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
dsize -= len;
|
|
}
|
|
if (dsize != 0)
|
|
goto err;
|
|
|
|
}
|
|
# ifndef OPENSSL_NO_SRP
|
|
else if (type == TLSEXT_TYPE_srp) {
|
|
if (size == 0 || ((len = data[0])) != (size - 1))
|
|
goto err;
|
|
if (s->srp_ctx.login != NULL)
|
|
goto err;
|
|
if ((s->srp_ctx.login = OPENSSL_malloc(len + 1)) == NULL)
|
|
return -1;
|
|
memcpy(s->srp_ctx.login, &data[1], len);
|
|
s->srp_ctx.login[len] = '\0';
|
|
|
|
if (strlen(s->srp_ctx.login) != len)
|
|
goto err;
|
|
}
|
|
# endif
|
|
|
|
# ifndef OPENSSL_NO_EC
|
|
else if (type == TLSEXT_TYPE_ec_point_formats) {
|
|
unsigned char *sdata = data;
|
|
int ecpointformatlist_length = *(sdata++);
|
|
|
|
if (ecpointformatlist_length != size - 1)
|
|
goto err;
|
|
if (!s->hit) {
|
|
if (s->session->tlsext_ecpointformatlist) {
|
|
OPENSSL_free(s->session->tlsext_ecpointformatlist);
|
|
s->session->tlsext_ecpointformatlist = NULL;
|
|
}
|
|
s->session->tlsext_ecpointformatlist_length = 0;
|
|
if ((s->session->tlsext_ecpointformatlist =
|
|
OPENSSL_malloc(ecpointformatlist_length)) == NULL) {
|
|
*al = TLS1_AD_INTERNAL_ERROR;
|
|
return 0;
|
|
}
|
|
s->session->tlsext_ecpointformatlist_length =
|
|
ecpointformatlist_length;
|
|
memcpy(s->session->tlsext_ecpointformatlist, sdata,
|
|
ecpointformatlist_length);
|
|
}
|
|
# if 0
|
|
fprintf(stderr,
|
|
"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ",
|
|
s->session->tlsext_ecpointformatlist_length);
|
|
sdata = s->session->tlsext_ecpointformatlist;
|
|
for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
|
|
fprintf(stderr, "%i ", *(sdata++));
|
|
fprintf(stderr, "\n");
|
|
# endif
|
|
} else if (type == TLSEXT_TYPE_elliptic_curves) {
|
|
unsigned char *sdata = data;
|
|
int ellipticcurvelist_length = (*(sdata++) << 8);
|
|
ellipticcurvelist_length += (*(sdata++));
|
|
|
|
if (ellipticcurvelist_length != size - 2 ||
|
|
ellipticcurvelist_length < 1 ||
|
|
/* Each NamedCurve is 2 bytes. */
|
|
ellipticcurvelist_length & 1)
|
|
goto err;
|
|
|
|
if (!s->hit) {
|
|
if (s->session->tlsext_ellipticcurvelist)
|
|
goto err;
|
|
|
|
s->session->tlsext_ellipticcurvelist_length = 0;
|
|
if ((s->session->tlsext_ellipticcurvelist =
|
|
OPENSSL_malloc(ellipticcurvelist_length)) == NULL) {
|
|
*al = TLS1_AD_INTERNAL_ERROR;
|
|
return 0;
|
|
}
|
|
s->session->tlsext_ellipticcurvelist_length =
|
|
ellipticcurvelist_length;
|
|
memcpy(s->session->tlsext_ellipticcurvelist, sdata,
|
|
ellipticcurvelist_length);
|
|
}
|
|
# if 0
|
|
fprintf(stderr,
|
|
"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ",
|
|
s->session->tlsext_ellipticcurvelist_length);
|
|
sdata = s->session->tlsext_ellipticcurvelist;
|
|
for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
|
|
fprintf(stderr, "%i ", *(sdata++));
|
|
fprintf(stderr, "\n");
|
|
# endif
|
|
}
|
|
# endif /* OPENSSL_NO_EC */
|
|
# ifdef TLSEXT_TYPE_opaque_prf_input
|
|
else if (type == TLSEXT_TYPE_opaque_prf_input &&
|
|
s->version != DTLS1_VERSION) {
|
|
unsigned char *sdata = data;
|
|
|
|
if (size < 2) {
|
|
*al = SSL_AD_DECODE_ERROR;
|
|
return 0;
|
|
}
|
|
n2s(sdata, s->s3->client_opaque_prf_input_len);
|
|
if (s->s3->client_opaque_prf_input_len != size - 2) {
|
|
*al = SSL_AD_DECODE_ERROR;
|
|
return 0;
|
|
}
|
|
|
|
if (s->s3->client_opaque_prf_input != NULL) {
|
|
/* shouldn't really happen */
|
|
OPENSSL_free(s->s3->client_opaque_prf_input);
|
|
}
|
|
|
|
/* dummy byte just to get non-NULL */
|
|
if (s->s3->client_opaque_prf_input_len == 0)
|
|
s->s3->client_opaque_prf_input = OPENSSL_malloc(1);
|
|
else
|
|
s->s3->client_opaque_prf_input =
|
|
BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
|
|
if (s->s3->client_opaque_prf_input == NULL) {
|
|
*al = TLS1_AD_INTERNAL_ERROR;
|
|
return 0;
|
|
}
|
|
}
|
|
# endif
|
|
else if (type == TLSEXT_TYPE_session_ticket) {
|
|
if (s->tls_session_ticket_ext_cb &&
|
|
!s->tls_session_ticket_ext_cb(s, data, size,
|
|
s->tls_session_ticket_ext_cb_arg))
|
|
{
|
|
*al = TLS1_AD_INTERNAL_ERROR;
|
|
return 0;
|
|
}
|
|
} else if (type == TLSEXT_TYPE_renegotiate) {
|
|
if (!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
|
|
return 0;
|
|
renegotiate_seen = 1;
|
|
} else if (type == TLSEXT_TYPE_signature_algorithms) {
|
|
int dsize;
|
|
if (sigalg_seen || size < 2)
|
|
goto err;
|
|
sigalg_seen = 1;
|
|
n2s(data, dsize);
|
|
size -= 2;
|
|
if (dsize != size || dsize & 1)
|
|
goto err;
|
|
if (!tls1_process_sigalgs(s, data, dsize))
|
|
goto err;
|
|
} else if (type == TLSEXT_TYPE_status_request &&
|
|
s->version != DTLS1_VERSION) {
|
|
|
|
if (size < 5)
|
|
goto err;
|
|
|
|
s->tlsext_status_type = *data++;
|
|
size--;
|
|
if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) {
|
|
const unsigned char *sdata;
|
|
int dsize;
|
|
/* Read in responder_id_list */
|
|
n2s(data, dsize);
|
|
size -= 2;
|
|
if (dsize > size)
|
|
goto err;
|
|
while (dsize > 0) {
|
|
OCSP_RESPID *id;
|
|
int idsize;
|
|
if (dsize < 4)
|
|
goto err;
|
|
n2s(data, idsize);
|
|
dsize -= 2 + idsize;
|
|
size -= 2 + idsize;
|
|
if (dsize < 0)
|
|
goto err;
|
|
sdata = data;
|
|
data += idsize;
|
|
id = d2i_OCSP_RESPID(NULL, &sdata, idsize);
|
|
if (!id)
|
|
goto err;
|
|
if (data != sdata) {
|
|
OCSP_RESPID_free(id);
|
|
goto err;
|
|
}
|
|
if (!s->tlsext_ocsp_ids
|
|
&& !(s->tlsext_ocsp_ids =
|
|
sk_OCSP_RESPID_new_null())) {
|
|
OCSP_RESPID_free(id);
|
|
*al = SSL_AD_INTERNAL_ERROR;
|
|
return 0;
|
|
}
|
|
if (!sk_OCSP_RESPID_push(s->tlsext_ocsp_ids, id)) {
|
|
OCSP_RESPID_free(id);
|
|
*al = SSL_AD_INTERNAL_ERROR;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Read in request_extensions */
|
|
if (size < 2)
|
|
goto err;
|
|
n2s(data, dsize);
|
|
size -= 2;
|
|
if (dsize != size)
|
|
goto err;
|
|
sdata = data;
|
|
if (dsize > 0) {
|
|
if (s->tlsext_ocsp_exts) {
|
|
sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
|
|
X509_EXTENSION_free);
|
|
}
|
|
|
|
s->tlsext_ocsp_exts =
|
|
d2i_X509_EXTENSIONS(NULL, &sdata, dsize);
|
|
if (!s->tlsext_ocsp_exts || (data + dsize != sdata))
|
|
goto err;
|
|
}
|
|
}
|
|
/*
|
|
* We don't know what to do with any other type * so ignore it.
|
|
*/
|
|
else
|
|
s->tlsext_status_type = -1;
|
|
}
|
|
# ifndef OPENSSL_NO_HEARTBEATS
|
|
else if (type == TLSEXT_TYPE_heartbeat) {
|
|
switch (data[0]) {
|
|
case 0x01: /* Client allows us to send HB requests */
|
|
s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
|
|
break;
|
|
case 0x02: /* Client doesn't accept HB requests */
|
|
s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
|
|
s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
|
|
break;
|
|
default:
|
|
*al = SSL_AD_ILLEGAL_PARAMETER;
|
|
return 0;
|
|
}
|
|
}
|
|
# endif
|
|
# ifndef OPENSSL_NO_NEXTPROTONEG
|
|
else if (type == TLSEXT_TYPE_next_proto_neg &&
|
|
s->s3->tmp.finish_md_len == 0) {
|
|
/*-
|
|
* We shouldn't accept this extension on a
|
|
* renegotiation.
|
|
*
|
|
* s->new_session will be set on renegotiation, but we
|
|
* probably shouldn't rely that it couldn't be set on
|
|
* the initial renegotation too in certain cases (when
|
|
* there's some other reason to disallow resuming an
|
|
* earlier session -- the current code won't be doing
|
|
* anything like that, but this might change).
|
|
*
|
|
* A valid sign that there's been a previous handshake
|
|
* in this connection is if s->s3->tmp.finish_md_len >
|
|
* 0. (We are talking about a check that will happen
|
|
* in the Hello protocol round, well before a new
|
|
* Finished message could have been computed.)
|
|
*/
|
|
s->s3->next_proto_neg_seen = 1;
|
|
}
|
|
# endif
|
|
|
|
/* session ticket processed earlier */
|
|
# ifndef OPENSSL_NO_SRTP
|
|
else if (SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s)
|
|
&& type == TLSEXT_TYPE_use_srtp) {
|
|
if (ssl_parse_clienthello_use_srtp_ext(s, data, size, al))
|
|
return 0;
|
|
}
|
|
# endif
|
|
|
|
data += size;
|
|
}
|
|
|
|
/* Spurious data on the end */
|
|
if (data != limit)
|
|
goto err;
|
|
|
|
*p = data;
|
|
|
|
ri_check:
|
|
|
|
/* Need RI if renegotiating */
|
|
|
|
if (!renegotiate_seen && s->renegotiate &&
|
|
!(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
|
|
*al = SSL_AD_HANDSHAKE_FAILURE;
|
|
SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,
|
|
SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
err:
|
|
*al = SSL_AD_DECODE_ERROR;
|
|
return 0;
|
|
}
|
|
|
|
# ifndef OPENSSL_NO_NEXTPROTONEG
|
|
/*
|
|
* ssl_next_proto_validate validates a Next Protocol Negotiation block. No
|
|
* elements of zero length are allowed and the set of elements must exactly
|
|
* fill the length of the block.
|
|
*/
|
|
static char ssl_next_proto_validate(unsigned char *d, unsigned len)
|
|
{
|
|
unsigned int off = 0;
|
|
|
|
while (off < len) {
|
|
if (d[off] == 0)
|
|
return 0;
|
|
off += d[off];
|
|
off++;
|
|
}
|
|
|
|
return off == len;
|
|
}
|
|
# endif
|
|
|
|
int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d,
|
|
int n, int *al)
|
|
{
|
|
unsigned short length;
|
|
unsigned short type;
|
|
unsigned short size;
|
|
unsigned char *data = *p;
|
|
int tlsext_servername = 0;
|
|
int renegotiate_seen = 0;
|
|
|
|
# ifndef OPENSSL_NO_NEXTPROTONEG
|
|
s->s3->next_proto_neg_seen = 0;
|
|
# endif
|
|
s->tlsext_ticket_expected = 0;
|
|
|
|
# ifndef OPENSSL_NO_HEARTBEATS
|
|
s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
|
|
SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
|
|
# endif
|
|
|
|
if (data >= (d + n - 2))
|
|
goto ri_check;
|
|
|
|
n2s(data, length);
|
|
if (data + length != d + n) {
|
|
*al = SSL_AD_DECODE_ERROR;
|
|
return 0;
|
|
}
|
|
|
|
while (data <= (d + n - 4)) {
|
|
n2s(data, type);
|
|
n2s(data, size);
|
|
|
|
if (data + size > (d + n))
|
|
goto ri_check;
|
|
|
|
if (s->tlsext_debug_cb)
|
|
s->tlsext_debug_cb(s, 1, type, data, size, s->tlsext_debug_arg);
|
|
|
|
if (type == TLSEXT_TYPE_server_name) {
|
|
if (s->tlsext_hostname == NULL || size > 0) {
|
|
*al = TLS1_AD_UNRECOGNIZED_NAME;
|
|
return 0;
|
|
}
|
|
tlsext_servername = 1;
|
|
}
|
|
# ifndef OPENSSL_NO_EC
|
|
else if (type == TLSEXT_TYPE_ec_point_formats) {
|
|
unsigned char *sdata = data;
|
|
int ecpointformatlist_length = *(sdata++);
|
|
|
|
if (ecpointformatlist_length != size - 1 ||
|
|
ecpointformatlist_length < 1) {
|
|
*al = TLS1_AD_DECODE_ERROR;
|
|
return 0;
|
|
}
|
|
if (!s->hit) {
|
|
s->session->tlsext_ecpointformatlist_length = 0;
|
|
if (s->session->tlsext_ecpointformatlist != NULL)
|
|
OPENSSL_free(s->session->tlsext_ecpointformatlist);
|
|
if ((s->session->tlsext_ecpointformatlist =
|
|
OPENSSL_malloc(ecpointformatlist_length)) == NULL) {
|
|
*al = TLS1_AD_INTERNAL_ERROR;
|
|
return 0;
|
|
}
|
|
s->session->tlsext_ecpointformatlist_length =
|
|
ecpointformatlist_length;
|
|
memcpy(s->session->tlsext_ecpointformatlist, sdata,
|
|
ecpointformatlist_length);
|
|
}
|
|
# if 0
|
|
fprintf(stderr,
|
|
"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
|
|
sdata = s->session->tlsext_ecpointformatlist;
|
|
for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
|
|
fprintf(stderr, "%i ", *(sdata++));
|
|
fprintf(stderr, "\n");
|
|
# endif
|
|
}
|
|
# endif /* OPENSSL_NO_EC */
|
|
|
|
else if (type == TLSEXT_TYPE_session_ticket) {
|
|
if (s->tls_session_ticket_ext_cb &&
|
|
!s->tls_session_ticket_ext_cb(s, data, size,
|
|
s->tls_session_ticket_ext_cb_arg))
|
|
{
|
|
*al = TLS1_AD_INTERNAL_ERROR;
|
|
return 0;
|
|
}
|
|
if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
|
|
|| (size > 0)) {
|
|
*al = TLS1_AD_UNSUPPORTED_EXTENSION;
|
|
return 0;
|
|
}
|
|
s->tlsext_ticket_expected = 1;
|
|
}
|
|
# ifdef TLSEXT_TYPE_opaque_prf_input
|
|
else if (type == TLSEXT_TYPE_opaque_prf_input &&
|
|
s->version != DTLS1_VERSION) {
|
|
unsigned char *sdata = data;
|
|
|
|
if (size < 2) {
|
|
*al = SSL_AD_DECODE_ERROR;
|
|
return 0;
|
|
}
|
|
n2s(sdata, s->s3->server_opaque_prf_input_len);
|
|
if (s->s3->server_opaque_prf_input_len != size - 2) {
|
|
*al = SSL_AD_DECODE_ERROR;
|
|
return 0;
|
|
}
|
|
|
|
if (s->s3->server_opaque_prf_input != NULL) {
|
|
/* shouldn't really happen */
|
|
OPENSSL_free(s->s3->server_opaque_prf_input);
|
|
}
|
|
if (s->s3->server_opaque_prf_input_len == 0) {
|
|
/* dummy byte just to get non-NULL */
|
|
s->s3->server_opaque_prf_input = OPENSSL_malloc(1);
|
|
} else {
|
|
s->s3->server_opaque_prf_input =
|
|
BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
|
|
}
|
|
|
|
if (s->s3->server_opaque_prf_input == NULL) {
|
|
*al = TLS1_AD_INTERNAL_ERROR;
|
|
return 0;
|
|
}
|
|
}
|
|
# endif
|
|
else if (type == TLSEXT_TYPE_status_request &&
|
|
s->version != DTLS1_VERSION) {
|
|
/*
|
|
* MUST be empty and only sent if we've requested a status
|
|
* request message.
|
|
*/
|
|
if ((s->tlsext_status_type == -1) || (size > 0)) {
|
|
*al = TLS1_AD_UNSUPPORTED_EXTENSION;
|
|
return 0;
|
|
}
|
|
/* Set flag to expect CertificateStatus message */
|
|
s->tlsext_status_expected = 1;
|
|
}
|
|
# ifndef OPENSSL_NO_NEXTPROTONEG
|
|
else if (type == TLSEXT_TYPE_next_proto_neg &&
|
|
s->s3->tmp.finish_md_len == 0) {
|
|
unsigned char *selected;
|
|
unsigned char selected_len;
|
|
|
|
/* We must have requested it. */
|
|
if (s->ctx->next_proto_select_cb == NULL) {
|
|
*al = TLS1_AD_UNSUPPORTED_EXTENSION;
|
|
return 0;
|
|
}
|
|
/* The data must be valid */
|
|
if (!ssl_next_proto_validate(data, size)) {
|
|
*al = TLS1_AD_DECODE_ERROR;
|
|
return 0;
|
|
}
|
|
if (s->
|
|
ctx->next_proto_select_cb(s, &selected, &selected_len, data,
|
|
size,
|
|
s->ctx->next_proto_select_cb_arg) !=
|
|
SSL_TLSEXT_ERR_OK) {
|
|
*al = TLS1_AD_INTERNAL_ERROR;
|
|
return 0;
|
|
}
|
|
s->next_proto_negotiated = OPENSSL_malloc(selected_len);
|
|
if (!s->next_proto_negotiated) {
|
|
*al = TLS1_AD_INTERNAL_ERROR;
|
|
return 0;
|
|
}
|
|
memcpy(s->next_proto_negotiated, selected, selected_len);
|
|
s->next_proto_negotiated_len = selected_len;
|
|
s->s3->next_proto_neg_seen = 1;
|
|
}
|
|
# endif
|
|
else if (type == TLSEXT_TYPE_renegotiate) {
|
|
if (!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
|
|
return 0;
|
|
renegotiate_seen = 1;
|
|
}
|
|
# ifndef OPENSSL_NO_HEARTBEATS
|
|
else if (type == TLSEXT_TYPE_heartbeat) {
|
|
switch (data[0]) {
|
|
case 0x01: /* Server allows us to send HB requests */
|
|
s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
|
|
break;
|
|
case 0x02: /* Server doesn't accept HB requests */
|
|
s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
|
|
s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
|
|
break;
|
|
default:
|
|
*al = SSL_AD_ILLEGAL_PARAMETER;
|
|
return 0;
|
|
}
|
|
}
|
|
# endif
|
|
# ifndef OPENSSL_NO_SRTP
|
|
else if (SSL_IS_DTLS(s) && type == TLSEXT_TYPE_use_srtp) {
|
|
if (ssl_parse_serverhello_use_srtp_ext(s, data, size, al))
|
|
return 0;
|
|
}
|
|
# endif
|
|
|
|
data += size;
|
|
}
|
|
|
|
if (data != d + n) {
|
|
*al = SSL_AD_DECODE_ERROR;
|
|
return 0;
|
|
}
|
|
|
|
if (!s->hit && tlsext_servername == 1) {
|
|
if (s->tlsext_hostname) {
|
|
if (s->session->tlsext_hostname == NULL) {
|
|
s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
|
|
if (!s->session->tlsext_hostname) {
|
|
*al = SSL_AD_UNRECOGNIZED_NAME;
|
|
return 0;
|
|
}
|
|
} else {
|
|
*al = SSL_AD_DECODE_ERROR;
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
*p = data;
|
|
|
|
ri_check:
|
|
|
|
/*
|
|
* Determine if we need to see RI. Strictly speaking if we want to avoid
|
|
* an attack we should *always* see RI even on initial server hello
|
|
* because the client doesn't see any renegotiation during an attack.
|
|
* However this would mean we could not connect to any server which
|
|
* doesn't support RI so for the immediate future tolerate RI absence on
|
|
* initial connect only.
|
|
*/
|
|
if (!renegotiate_seen && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
|
|
&& !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
|
|
*al = SSL_AD_HANDSHAKE_FAILURE;
|
|
SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,
|
|
SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int ssl_prepare_clienthello_tlsext(SSL *s)
|
|
{
|
|
# ifndef OPENSSL_NO_EC
|
|
/*
|
|
* If we are client and using an elliptic curve cryptography cipher
|
|
* suite, send the point formats and elliptic curves we support.
|
|
*/
|
|
int using_ecc = 0;
|
|
int i;
|
|
unsigned char *j;
|
|
unsigned long alg_k, alg_a;
|
|
STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
|
|
|
|
for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++) {
|
|
SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
|
|
|
|
alg_k = c->algorithm_mkey;
|
|
alg_a = c->algorithm_auth;
|
|
if ((alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)
|
|
|| (alg_a & SSL_aECDSA))) {
|
|
using_ecc = 1;
|
|
break;
|
|
}
|
|
}
|
|
using_ecc = using_ecc && (s->version >= TLS1_VERSION);
|
|
if (using_ecc) {
|
|
if (s->tlsext_ecpointformatlist != NULL)
|
|
OPENSSL_free(s->tlsext_ecpointformatlist);
|
|
if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) {
|
|
SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,
|
|
ERR_R_MALLOC_FAILURE);
|
|
return -1;
|
|
}
|
|
s->tlsext_ecpointformatlist_length = 3;
|
|
s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
|
|
s->tlsext_ecpointformatlist[1] =
|
|
TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
|
|
s->tlsext_ecpointformatlist[2] =
|
|
TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
|
|
|
|
/* we support all named elliptic curves in RFC 4492 */
|
|
if (s->tlsext_ellipticcurvelist != NULL)
|
|
OPENSSL_free(s->tlsext_ellipticcurvelist);
|
|
s->tlsext_ellipticcurvelist_length =
|
|
sizeof(pref_list) / sizeof(pref_list[0]) * 2;
|
|
if ((s->tlsext_ellipticcurvelist =
|
|
OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL) {
|
|
s->tlsext_ellipticcurvelist_length = 0;
|
|
SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,
|
|
ERR_R_MALLOC_FAILURE);
|
|
return -1;
|
|
}
|
|
for (i = 0, j = s->tlsext_ellipticcurvelist; (unsigned int)i <
|
|
sizeof(pref_list) / sizeof(pref_list[0]); i++) {
|
|
int id = tls1_ec_nid2curve_id(pref_list[i]);
|
|
s2n(id, j);
|
|
}
|
|
}
|
|
# endif /* OPENSSL_NO_EC */
|
|
|
|
# ifdef TLSEXT_TYPE_opaque_prf_input
|
|
{
|
|
int r = 1;
|
|
|
|
if (s->ctx->tlsext_opaque_prf_input_callback != 0) {
|
|
r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0,
|
|
s->
|
|
ctx->tlsext_opaque_prf_input_callback_arg);
|
|
if (!r)
|
|
return -1;
|
|
}
|
|
|
|
if (s->tlsext_opaque_prf_input != NULL) {
|
|
if (s->s3->client_opaque_prf_input != NULL) {
|
|
/* shouldn't really happen */
|
|
OPENSSL_free(s->s3->client_opaque_prf_input);
|
|
}
|
|
|
|
if (s->tlsext_opaque_prf_input_len == 0) {
|
|
/* dummy byte just to get non-NULL */
|
|
s->s3->client_opaque_prf_input = OPENSSL_malloc(1);
|
|
} else {
|
|
s->s3->client_opaque_prf_input =
|
|
BUF_memdup(s->tlsext_opaque_prf_input,
|
|
s->tlsext_opaque_prf_input_len);
|
|
}
|
|
if (s->s3->client_opaque_prf_input == NULL) {
|
|
SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,
|
|
ERR_R_MALLOC_FAILURE);
|
|
return -1;
|
|
}
|
|
s->s3->client_opaque_prf_input_len =
|
|
s->tlsext_opaque_prf_input_len;
|
|
}
|
|
|
|
if (r == 2)
|
|
/*
|
|
* at callback's request, insist on receiving an appropriate
|
|
* server opaque PRF input
|
|
*/
|
|
s->s3->server_opaque_prf_input_len =
|
|
s->tlsext_opaque_prf_input_len;
|
|
}
|
|
# endif
|
|
|
|
return 1;
|
|
}
|
|
|
|
int ssl_prepare_serverhello_tlsext(SSL *s)
|
|
{
|
|
# ifndef OPENSSL_NO_EC
|
|
/*
|
|
* If we are server and using an ECC cipher suite, send the point formats
|
|
* we support if the client sent us an ECPointsFormat extension. Note
|
|
* that the server is not supposed to send an EllipticCurves extension.
|
|
*/
|
|
|
|
unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
|
|
unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
|
|
int using_ecc = (alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe))
|
|
|| (alg_a & SSL_aECDSA);
|
|
using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
|
|
|
|
if (using_ecc) {
|
|
if (s->tlsext_ecpointformatlist != NULL)
|
|
OPENSSL_free(s->tlsext_ecpointformatlist);
|
|
if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) {
|
|
SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,
|
|
ERR_R_MALLOC_FAILURE);
|
|
return -1;
|
|
}
|
|
s->tlsext_ecpointformatlist_length = 3;
|
|
s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
|
|
s->tlsext_ecpointformatlist[1] =
|
|
TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
|
|
s->tlsext_ecpointformatlist[2] =
|
|
TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
|
|
}
|
|
# endif /* OPENSSL_NO_EC */
|
|
|
|
return 1;
|
|
}
|
|
|
|
int ssl_check_clienthello_tlsext_early(SSL *s)
|
|
{
|
|
int ret = SSL_TLSEXT_ERR_NOACK;
|
|
int al = SSL_AD_UNRECOGNIZED_NAME;
|
|
|
|
# ifndef OPENSSL_NO_EC
|
|
/*
|
|
* The handling of the ECPointFormats extension is done elsewhere, namely
|
|
* in ssl3_choose_cipher in s3_lib.c.
|
|
*/
|
|
/*
|
|
* The handling of the EllipticCurves extension is done elsewhere, namely
|
|
* in ssl3_choose_cipher in s3_lib.c.
|
|
*/
|
|
# endif
|
|
|
|
if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
|
|
ret =
|
|
s->ctx->tlsext_servername_callback(s, &al,
|
|
s->ctx->tlsext_servername_arg);
|
|
else if (s->initial_ctx != NULL
|
|
&& s->initial_ctx->tlsext_servername_callback != 0)
|
|
ret =
|
|
s->initial_ctx->tlsext_servername_callback(s, &al,
|
|
s->
|
|
initial_ctx->tlsext_servername_arg);
|
|
|
|
# ifdef TLSEXT_TYPE_opaque_prf_input
|
|
{
|
|
/*
|
|
* This sort of belongs into ssl_prepare_serverhello_tlsext(), but we
|
|
* might be sending an alert in response to the client hello, so this
|
|
* has to happen here in ssl_check_clienthello_tlsext_early().
|
|
*/
|
|
|
|
int r = 1;
|
|
|
|
if (s->ctx->tlsext_opaque_prf_input_callback != 0) {
|
|
r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0,
|
|
s->
|
|
ctx->tlsext_opaque_prf_input_callback_arg);
|
|
if (!r) {
|
|
ret = SSL_TLSEXT_ERR_ALERT_FATAL;
|
|
al = SSL_AD_INTERNAL_ERROR;
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
if (s->s3->server_opaque_prf_input != NULL) {
|
|
/* shouldn't really happen */
|
|
OPENSSL_free(s->s3->server_opaque_prf_input);
|
|
}
|
|
s->s3->server_opaque_prf_input = NULL;
|
|
|
|
if (s->tlsext_opaque_prf_input != NULL) {
|
|
if (s->s3->client_opaque_prf_input != NULL &&
|
|
s->s3->client_opaque_prf_input_len ==
|
|
s->tlsext_opaque_prf_input_len) {
|
|
/*
|
|
* can only use this extension if we have a server opaque PRF
|
|
* input of the same length as the client opaque PRF input!
|
|
*/
|
|
|
|
if (s->tlsext_opaque_prf_input_len == 0) {
|
|
/* dummy byte just to get non-NULL */
|
|
s->s3->server_opaque_prf_input = OPENSSL_malloc(1);
|
|
} else {
|
|
s->s3->server_opaque_prf_input =
|
|
BUF_memdup(s->tlsext_opaque_prf_input,
|
|
s->tlsext_opaque_prf_input_len);
|
|
}
|
|
if (s->s3->server_opaque_prf_input == NULL) {
|
|
ret = SSL_TLSEXT_ERR_ALERT_FATAL;
|
|
al = SSL_AD_INTERNAL_ERROR;
|
|
goto err;
|
|
}
|
|
s->s3->server_opaque_prf_input_len =
|
|
s->tlsext_opaque_prf_input_len;
|
|
}
|
|
}
|
|
|
|
if (r == 2 && s->s3->server_opaque_prf_input == NULL) {
|
|
/*
|
|
* The callback wants to enforce use of the extension, but we
|
|
* can't do that with the client opaque PRF input; abort the
|
|
* handshake.
|
|
*/
|
|
ret = SSL_TLSEXT_ERR_ALERT_FATAL;
|
|
al = SSL_AD_HANDSHAKE_FAILURE;
|
|
}
|
|
}
|
|
|
|
err:
|
|
# endif
|
|
switch (ret) {
|
|
case SSL_TLSEXT_ERR_ALERT_FATAL:
|
|
ssl3_send_alert(s, SSL3_AL_FATAL, al);
|
|
return -1;
|
|
|
|
case SSL_TLSEXT_ERR_ALERT_WARNING:
|
|
ssl3_send_alert(s, SSL3_AL_WARNING, al);
|
|
return 1;
|
|
|
|
case SSL_TLSEXT_ERR_NOACK:
|
|
s->servername_done = 0;
|
|
default:
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
int ssl_check_clienthello_tlsext_late(SSL *s)
|
|
{
|
|
int ret = SSL_TLSEXT_ERR_OK;
|
|
int al;
|
|
|
|
/*
|
|
* If status request then ask callback what to do. Note: this must be
|
|
* called after servername callbacks in case the certificate has
|
|
* changed, and must be called after the cipher has been chosen because
|
|
* this may influence which certificate is sent
|
|
*/
|
|
if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb) {
|
|
int r;
|
|
CERT_PKEY *certpkey;
|
|
certpkey = ssl_get_server_send_pkey(s);
|
|
/* If no certificate can't return certificate status */
|
|
if (certpkey == NULL) {
|
|
s->tlsext_status_expected = 0;
|
|
return 1;
|
|
}
|
|
/*
|
|
* Set current certificate to one we will use so SSL_get_certificate
|
|
* et al can pick it up.
|
|
*/
|
|
s->cert->key = certpkey;
|
|
r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
|
|
switch (r) {
|
|
/* We don't want to send a status request response */
|
|
case SSL_TLSEXT_ERR_NOACK:
|
|
s->tlsext_status_expected = 0;
|
|
break;
|
|
/* status request response should be sent */
|
|
case SSL_TLSEXT_ERR_OK:
|
|
if (s->tlsext_ocsp_resp)
|
|
s->tlsext_status_expected = 1;
|
|
else
|
|
s->tlsext_status_expected = 0;
|
|
break;
|
|
/* something bad happened */
|
|
case SSL_TLSEXT_ERR_ALERT_FATAL:
|
|
ret = SSL_TLSEXT_ERR_ALERT_FATAL;
|
|
al = SSL_AD_INTERNAL_ERROR;
|
|
goto err;
|
|
}
|
|
} else
|
|
s->tlsext_status_expected = 0;
|
|
|
|
err:
|
|
switch (ret) {
|
|
case SSL_TLSEXT_ERR_ALERT_FATAL:
|
|
ssl3_send_alert(s, SSL3_AL_FATAL, al);
|
|
return -1;
|
|
|
|
case SSL_TLSEXT_ERR_ALERT_WARNING:
|
|
ssl3_send_alert(s, SSL3_AL_WARNING, al);
|
|
return 1;
|
|
|
|
default:
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
int ssl_check_serverhello_tlsext(SSL *s)
|
|
{
|
|
int ret = SSL_TLSEXT_ERR_NOACK;
|
|
int al = SSL_AD_UNRECOGNIZED_NAME;
|
|
|
|
# ifndef OPENSSL_NO_EC
|
|
/*
|
|
* If we are client and using an elliptic curve cryptography cipher
|
|
* suite, then if server returns an EC point formats lists extension it
|
|
* must contain uncompressed.
|
|
*/
|
|
unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
|
|
unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
|
|
if ((s->tlsext_ecpointformatlist != NULL)
|
|
&& (s->tlsext_ecpointformatlist_length > 0)
|
|
&& (s->session->tlsext_ecpointformatlist != NULL)
|
|
&& (s->session->tlsext_ecpointformatlist_length > 0)
|
|
&& ((alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe))
|
|
|| (alg_a & SSL_aECDSA))) {
|
|
/* we are using an ECC cipher */
|
|
size_t i;
|
|
unsigned char *list;
|
|
int found_uncompressed = 0;
|
|
list = s->session->tlsext_ecpointformatlist;
|
|
for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) {
|
|
if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed) {
|
|
found_uncompressed = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (!found_uncompressed) {
|
|
SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,
|
|
SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
|
|
return -1;
|
|
}
|
|
}
|
|
ret = SSL_TLSEXT_ERR_OK;
|
|
# endif /* OPENSSL_NO_EC */
|
|
|
|
if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
|
|
ret =
|
|
s->ctx->tlsext_servername_callback(s, &al,
|
|
s->ctx->tlsext_servername_arg);
|
|
else if (s->initial_ctx != NULL
|
|
&& s->initial_ctx->tlsext_servername_callback != 0)
|
|
ret =
|
|
s->initial_ctx->tlsext_servername_callback(s, &al,
|
|
s->
|
|
initial_ctx->tlsext_servername_arg);
|
|
|
|
# ifdef TLSEXT_TYPE_opaque_prf_input
|
|
if (s->s3->server_opaque_prf_input_len > 0) {
|
|
/*
|
|
* This case may indicate that we, as a client, want to insist on
|
|
* using opaque PRF inputs. So first verify that we really have a
|
|
* value from the server too.
|
|
*/
|
|
|
|
if (s->s3->server_opaque_prf_input == NULL) {
|
|
ret = SSL_TLSEXT_ERR_ALERT_FATAL;
|
|
al = SSL_AD_HANDSHAKE_FAILURE;
|
|
}
|
|
|
|
/*
|
|
* Anytime the server *has* sent an opaque PRF input, we need to
|
|
* check that we have a client opaque PRF input of the same size.
|
|
*/
|
|
if (s->s3->client_opaque_prf_input == NULL ||
|
|
s->s3->client_opaque_prf_input_len !=
|
|
s->s3->server_opaque_prf_input_len) {
|
|
ret = SSL_TLSEXT_ERR_ALERT_FATAL;
|
|
al = SSL_AD_ILLEGAL_PARAMETER;
|
|
}
|
|
}
|
|
# endif
|
|
|
|
OPENSSL_free(s->tlsext_ocsp_resp);
|
|
s->tlsext_ocsp_resp = NULL;
|
|
s->tlsext_ocsp_resplen = -1;
|
|
/*
|
|
* If we've requested certificate status and we wont get one tell the
|
|
* callback
|
|
*/
|
|
if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
|
|
&& !(s->hit) && s->ctx && s->ctx->tlsext_status_cb) {
|
|
int r;
|
|
/*
|
|
* Call callback with resp == NULL and resplen == -1 so callback
|
|
* knows there is no response
|
|
*/
|
|
r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
|
|
if (r == 0) {
|
|
al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
|
|
ret = SSL_TLSEXT_ERR_ALERT_FATAL;
|
|
}
|
|
if (r < 0) {
|
|
al = SSL_AD_INTERNAL_ERROR;
|
|
ret = SSL_TLSEXT_ERR_ALERT_FATAL;
|
|
}
|
|
}
|
|
|
|
switch (ret) {
|
|
case SSL_TLSEXT_ERR_ALERT_FATAL:
|
|
ssl3_send_alert(s, SSL3_AL_FATAL, al);
|
|
return -1;
|
|
|
|
case SSL_TLSEXT_ERR_ALERT_WARNING:
|
|
ssl3_send_alert(s, SSL3_AL_WARNING, al);
|
|
return 1;
|
|
|
|
case SSL_TLSEXT_ERR_NOACK:
|
|
s->servername_done = 0;
|
|
default:
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/*-
|
|
* Since the server cache lookup is done early on in the processing of the
|
|
* ClientHello, and other operations depend on the result, we need to handle
|
|
* any TLS session ticket extension at the same time.
|
|
*
|
|
* session_id: points at the session ID in the ClientHello. This code will
|
|
* read past the end of this in order to parse out the session ticket
|
|
* extension, if any.
|
|
* len: the length of the session ID.
|
|
* limit: a pointer to the first byte after the ClientHello.
|
|
* ret: (output) on return, if a ticket was decrypted, then this is set to
|
|
* point to the resulting session.
|
|
*
|
|
* If s->tls_session_secret_cb is set then we are expecting a pre-shared key
|
|
* ciphersuite, in which case we have no use for session tickets and one will
|
|
* never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
|
|
*
|
|
* Returns:
|
|
* -1: fatal error, either from parsing or decrypting the ticket.
|
|
* 0: no ticket was found (or was ignored, based on settings).
|
|
* 1: a zero length extension was found, indicating that the client supports
|
|
* session tickets but doesn't currently have one to offer.
|
|
* 2: either s->tls_session_secret_cb was set, or a ticket was offered but
|
|
* couldn't be decrypted because of a non-fatal error.
|
|
* 3: a ticket was successfully decrypted and *ret was set.
|
|
*
|
|
* Side effects:
|
|
* Sets s->tlsext_ticket_expected to 1 if the server will have to issue
|
|
* a new session ticket to the client because the client indicated support
|
|
* (and s->tls_session_secret_cb is NULL) but the client either doesn't have
|
|
* a session ticket or we couldn't use the one it gave us, or if
|
|
* s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
|
|
* Otherwise, s->tlsext_ticket_expected is set to 0.
|
|
*/
|
|
int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
|
|
const unsigned char *limit, SSL_SESSION **ret)
|
|
{
|
|
/* Point after session ID in client hello */
|
|
const unsigned char *p = session_id + len;
|
|
unsigned short i;
|
|
|
|
*ret = NULL;
|
|
s->tlsext_ticket_expected = 0;
|
|
|
|
/*
|
|
* If tickets disabled behave as if no ticket present to permit stateful
|
|
* resumption.
|
|
*/
|
|
if (SSL_get_options(s) & SSL_OP_NO_TICKET)
|
|
return 0;
|
|
if ((s->version <= SSL3_VERSION) || !limit)
|
|
return 0;
|
|
if (p >= limit)
|
|
return -1;
|
|
/* Skip past DTLS cookie */
|
|
if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER) {
|
|
i = *(p++);
|
|
p += i;
|
|
if (p >= limit)
|
|
return -1;
|
|
}
|
|
/* Skip past cipher list */
|
|
n2s(p, i);
|
|
p += i;
|
|
if (p >= limit)
|
|
return -1;
|
|
/* Skip past compression algorithm list */
|
|
i = *(p++);
|
|
p += i;
|
|
if (p > limit)
|
|
return -1;
|
|
/* Now at start of extensions */
|
|
if ((p + 2) >= limit)
|
|
return 0;
|
|
n2s(p, i);
|
|
while ((p + 4) <= limit) {
|
|
unsigned short type, size;
|
|
n2s(p, type);
|
|
n2s(p, size);
|
|
if (p + size > limit)
|
|
return 0;
|
|
if (type == TLSEXT_TYPE_session_ticket) {
|
|
int r;
|
|
if (size == 0) {
|
|
/*
|
|
* The client will accept a ticket but doesn't currently have
|
|
* one.
|
|
*/
|
|
s->tlsext_ticket_expected = 1;
|
|
return 1;
|
|
}
|
|
if (s->tls_session_secret_cb) {
|
|
/*
|
|
* Indicate that the ticket couldn't be decrypted rather than
|
|
* generating the session from ticket now, trigger
|
|
* abbreviated handshake based on external mechanism to
|
|
* calculate the master secret later.
|
|
*/
|
|
return 2;
|
|
}
|
|
r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
|
|
switch (r) {
|
|
case 2: /* ticket couldn't be decrypted */
|
|
s->tlsext_ticket_expected = 1;
|
|
return 2;
|
|
case 3: /* ticket was decrypted */
|
|
return r;
|
|
case 4: /* ticket decrypted but need to renew */
|
|
s->tlsext_ticket_expected = 1;
|
|
return 3;
|
|
default: /* fatal error */
|
|
return -1;
|
|
}
|
|
}
|
|
p += size;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*-
|
|
* tls_decrypt_ticket attempts to decrypt a session ticket.
|
|
*
|
|
* etick: points to the body of the session ticket extension.
|
|
* eticklen: the length of the session tickets extenion.
|
|
* sess_id: points at the session ID.
|
|
* sesslen: the length of the session ID.
|
|
* psess: (output) on return, if a ticket was decrypted, then this is set to
|
|
* point to the resulting session.
|
|
*
|
|
* Returns:
|
|
* -1: fatal error, either from parsing or decrypting the ticket.
|
|
* 2: the ticket couldn't be decrypted.
|
|
* 3: a ticket was successfully decrypted and *psess was set.
|
|
* 4: same as 3, but the ticket needs to be renewed.
|
|
*/
|
|
static int tls_decrypt_ticket(SSL *s, const unsigned char *etick,
|
|
int eticklen, const unsigned char *sess_id,
|
|
int sesslen, SSL_SESSION **psess)
|
|
{
|
|
SSL_SESSION *sess;
|
|
unsigned char *sdec;
|
|
const unsigned char *p;
|
|
int slen, mlen, renew_ticket = 0;
|
|
unsigned char tick_hmac[EVP_MAX_MD_SIZE];
|
|
HMAC_CTX hctx;
|
|
EVP_CIPHER_CTX ctx;
|
|
SSL_CTX *tctx = s->initial_ctx;
|
|
/* Need at least keyname + iv + some encrypted data */
|
|
if (eticklen < 48)
|
|
return 2;
|
|
/* Initialize session ticket encryption and HMAC contexts */
|
|
HMAC_CTX_init(&hctx);
|
|
EVP_CIPHER_CTX_init(&ctx);
|
|
if (tctx->tlsext_ticket_key_cb) {
|
|
unsigned char *nctick = (unsigned char *)etick;
|
|
int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
|
|
&ctx, &hctx, 0);
|
|
if (rv < 0)
|
|
return -1;
|
|
if (rv == 0)
|
|
return 2;
|
|
if (rv == 2)
|
|
renew_ticket = 1;
|
|
} else {
|
|
/* Check key name matches */
|
|
if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
|
|
return 2;
|
|
if (HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
|
|
tlsext_tick_md(), NULL) <= 0
|
|
|| EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
|
|
tctx->tlsext_tick_aes_key,
|
|
etick + 16) <= 0) {
|
|
goto err;
|
|
}
|
|
}
|
|
/*
|
|
* Attempt to process session ticket, first conduct sanity and integrity
|
|
* checks on ticket.
|
|
*/
|
|
mlen = HMAC_size(&hctx);
|
|
if (mlen < 0) {
|
|
goto err;
|
|
}
|
|
eticklen -= mlen;
|
|
/* Check HMAC of encrypted ticket */
|
|
if (HMAC_Update(&hctx, etick, eticklen) <= 0
|
|
|| HMAC_Final(&hctx, tick_hmac, NULL) <= 0) {
|
|
goto err;
|
|
}
|
|
HMAC_CTX_cleanup(&hctx);
|
|
if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen)) {
|
|
EVP_CIPHER_CTX_cleanup(&ctx);
|
|
return 2;
|
|
}
|
|
/* Attempt to decrypt session data */
|
|
/* Move p after IV to start of encrypted ticket, update length */
|
|
p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
|
|
eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
|
|
sdec = OPENSSL_malloc(eticklen);
|
|
if (sdec == NULL
|
|
|| EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen) <= 0) {
|
|
EVP_CIPHER_CTX_cleanup(&ctx);
|
|
OPENSSL_free(sdec);
|
|
return -1;
|
|
}
|
|
if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0) {
|
|
EVP_CIPHER_CTX_cleanup(&ctx);
|
|
OPENSSL_free(sdec);
|
|
return 2;
|
|
}
|
|
slen += mlen;
|
|
EVP_CIPHER_CTX_cleanup(&ctx);
|
|
p = sdec;
|
|
|
|
sess = d2i_SSL_SESSION(NULL, &p, slen);
|
|
OPENSSL_free(sdec);
|
|
if (sess) {
|
|
/*
|
|
* The session ID, if non-empty, is used by some clients to detect
|
|
* that the ticket has been accepted. So we copy it to the session
|
|
* structure. If it is empty set length to zero as required by
|
|
* standard.
|
|
*/
|
|
if (sesslen)
|
|
memcpy(sess->session_id, sess_id, sesslen);
|
|
sess->session_id_length = sesslen;
|
|
*psess = sess;
|
|
if (renew_ticket)
|
|
return 4;
|
|
else
|
|
return 3;
|
|
}
|
|
ERR_clear_error();
|
|
/*
|
|
* For session parse failure, indicate that we need to send a new ticket.
|
|
*/
|
|
return 2;
|
|
err:
|
|
EVP_CIPHER_CTX_cleanup(&ctx);
|
|
HMAC_CTX_cleanup(&hctx);
|
|
return -1;
|
|
}
|
|
|
|
/* Tables to translate from NIDs to TLS v1.2 ids */
|
|
|
|
typedef struct {
|
|
int nid;
|
|
int id;
|
|
} tls12_lookup;
|
|
|
|
static tls12_lookup tls12_md[] = {
|
|
# ifndef OPENSSL_NO_MD5
|
|
{NID_md5, TLSEXT_hash_md5},
|
|
# endif
|
|
# ifndef OPENSSL_NO_SHA
|
|
{NID_sha1, TLSEXT_hash_sha1},
|
|
# endif
|
|
# ifndef OPENSSL_NO_SHA256
|
|
{NID_sha224, TLSEXT_hash_sha224},
|
|
{NID_sha256, TLSEXT_hash_sha256},
|
|
# endif
|
|
# ifndef OPENSSL_NO_SHA512
|
|
{NID_sha384, TLSEXT_hash_sha384},
|
|
{NID_sha512, TLSEXT_hash_sha512}
|
|
# endif
|
|
};
|
|
|
|
static tls12_lookup tls12_sig[] = {
|
|
# ifndef OPENSSL_NO_RSA
|
|
{EVP_PKEY_RSA, TLSEXT_signature_rsa},
|
|
# endif
|
|
# ifndef OPENSSL_NO_DSA
|
|
{EVP_PKEY_DSA, TLSEXT_signature_dsa},
|
|
# endif
|
|
# ifndef OPENSSL_NO_ECDSA
|
|
{EVP_PKEY_EC, TLSEXT_signature_ecdsa}
|
|
# endif
|
|
};
|
|
|
|
static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
|
|
{
|
|
size_t i;
|
|
for (i = 0; i < tlen; i++) {
|
|
if (table[i].nid == nid)
|
|
return table[i].id;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
# if 0
|
|
static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
|
|
{
|
|
size_t i;
|
|
for (i = 0; i < tlen; i++) {
|
|
if (table[i].id == id)
|
|
return table[i].nid;
|
|
}
|
|
return -1;
|
|
}
|
|
# endif
|
|
|
|
int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk,
|
|
const EVP_MD *md)
|
|
{
|
|
int sig_id, md_id;
|
|
if (!md)
|
|
return 0;
|
|
md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
|
|
sizeof(tls12_md) / sizeof(tls12_lookup));
|
|
if (md_id == -1)
|
|
return 0;
|
|
sig_id = tls12_get_sigid(pk);
|
|
if (sig_id == -1)
|
|
return 0;
|
|
p[0] = (unsigned char)md_id;
|
|
p[1] = (unsigned char)sig_id;
|
|
return 1;
|
|
}
|
|
|
|
int tls12_get_sigid(const EVP_PKEY *pk)
|
|
{
|
|
return tls12_find_id(pk->type, tls12_sig,
|
|
sizeof(tls12_sig) / sizeof(tls12_lookup));
|
|
}
|
|
|
|
const EVP_MD *tls12_get_hash(unsigned char hash_alg)
|
|
{
|
|
switch (hash_alg) {
|
|
# ifndef OPENSSL_NO_SHA
|
|
case TLSEXT_hash_sha1:
|
|
return EVP_sha1();
|
|
# endif
|
|
# ifndef OPENSSL_NO_SHA256
|
|
case TLSEXT_hash_sha224:
|
|
return EVP_sha224();
|
|
|
|
case TLSEXT_hash_sha256:
|
|
return EVP_sha256();
|
|
# endif
|
|
# ifndef OPENSSL_NO_SHA512
|
|
case TLSEXT_hash_sha384:
|
|
return EVP_sha384();
|
|
|
|
case TLSEXT_hash_sha512:
|
|
return EVP_sha512();
|
|
# endif
|
|
default:
|
|
return NULL;
|
|
|
|
}
|
|
}
|
|
|
|
/* Set preferred digest for each key type */
|
|
|
|
int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
|
|
{
|
|
int i, idx;
|
|
const EVP_MD *md;
|
|
CERT *c = s->cert;
|
|
/* Extension ignored for TLS versions below 1.2 */
|
|
if (TLS1_get_version(s) < TLS1_2_VERSION)
|
|
return 1;
|
|
/* Should never happen */
|
|
if (!c)
|
|
return 0;
|
|
|
|
c->pkeys[SSL_PKEY_DSA_SIGN].digest = NULL;
|
|
c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL;
|
|
c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL;
|
|
c->pkeys[SSL_PKEY_ECC].digest = NULL;
|
|
|
|
for (i = 0; i < dsize; i += 2) {
|
|
unsigned char hash_alg = data[i], sig_alg = data[i + 1];
|
|
|
|
switch (sig_alg) {
|
|
# ifndef OPENSSL_NO_RSA
|
|
case TLSEXT_signature_rsa:
|
|
idx = SSL_PKEY_RSA_SIGN;
|
|
break;
|
|
# endif
|
|
# ifndef OPENSSL_NO_DSA
|
|
case TLSEXT_signature_dsa:
|
|
idx = SSL_PKEY_DSA_SIGN;
|
|
break;
|
|
# endif
|
|
# ifndef OPENSSL_NO_ECDSA
|
|
case TLSEXT_signature_ecdsa:
|
|
idx = SSL_PKEY_ECC;
|
|
break;
|
|
# endif
|
|
default:
|
|
continue;
|
|
}
|
|
|
|
if (c->pkeys[idx].digest == NULL) {
|
|
md = tls12_get_hash(hash_alg);
|
|
if (md) {
|
|
c->pkeys[idx].digest = md;
|
|
if (idx == SSL_PKEY_RSA_SIGN)
|
|
c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
* Set any remaining keys to default values. NOTE: if alg is not
|
|
* supported it stays as NULL.
|
|
*/
|
|
# ifndef OPENSSL_NO_DSA
|
|
if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
|
|
c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_sha1();
|
|
# endif
|
|
# ifndef OPENSSL_NO_RSA
|
|
if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest) {
|
|
c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
|
|
c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
|
|
}
|
|
# endif
|
|
# ifndef OPENSSL_NO_ECDSA
|
|
if (!c->pkeys[SSL_PKEY_ECC].digest)
|
|
c->pkeys[SSL_PKEY_ECC].digest = EVP_sha1();
|
|
# endif
|
|
return 1;
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifndef OPENSSL_NO_HEARTBEATS
|
|
int tls1_process_heartbeat(SSL *s)
|
|
{
|
|
unsigned char *p = &s->s3->rrec.data[0], *pl;
|
|
unsigned short hbtype;
|
|
unsigned int payload;
|
|
unsigned int padding = 16; /* Use minimum padding */
|
|
|
|
if (s->msg_callback)
|
|
s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
|
|
&s->s3->rrec.data[0], s->s3->rrec.length,
|
|
s, s->msg_callback_arg);
|
|
|
|
/* Read type and payload length first */
|
|
if (1 + 2 + 16 > s->s3->rrec.length)
|
|
return 0; /* silently discard */
|
|
hbtype = *p++;
|
|
n2s(p, payload);
|
|
if (1 + 2 + payload + 16 > s->s3->rrec.length)
|
|
return 0; /* silently discard per RFC 6520 sec. 4 */
|
|
pl = p;
|
|
|
|
if (hbtype == TLS1_HB_REQUEST) {
|
|
unsigned char *buffer, *bp;
|
|
int r;
|
|
|
|
/*
|
|
* Allocate memory for the response, size is 1 bytes message type,
|
|
* plus 2 bytes payload length, plus payload, plus padding
|
|
*/
|
|
buffer = OPENSSL_malloc(1 + 2 + payload + padding);
|
|
if (buffer == NULL)
|
|
return -1;
|
|
bp = buffer;
|
|
|
|
/* Enter response type, length and copy payload */
|
|
*bp++ = TLS1_HB_RESPONSE;
|
|
s2n(payload, bp);
|
|
memcpy(bp, pl, payload);
|
|
bp += payload;
|
|
/* Random padding */
|
|
if (RAND_pseudo_bytes(bp, padding) < 0) {
|
|
OPENSSL_free(buffer);
|
|
return -1;
|
|
}
|
|
|
|
r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer,
|
|
3 + payload + padding);
|
|
|
|
if (r >= 0 && s->msg_callback)
|
|
s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
|
|
buffer, 3 + payload + padding,
|
|
s, s->msg_callback_arg);
|
|
|
|
OPENSSL_free(buffer);
|
|
|
|
if (r < 0)
|
|
return r;
|
|
} else if (hbtype == TLS1_HB_RESPONSE) {
|
|
unsigned int seq;
|
|
|
|
/*
|
|
* We only send sequence numbers (2 bytes unsigned int), and 16
|
|
* random bytes, so we just try to read the sequence number
|
|
*/
|
|
n2s(pl, seq);
|
|
|
|
if (payload == 18 && seq == s->tlsext_hb_seq) {
|
|
s->tlsext_hb_seq++;
|
|
s->tlsext_hb_pending = 0;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int tls1_heartbeat(SSL *s)
|
|
{
|
|
unsigned char *buf, *p;
|
|
int ret = -1;
|
|
unsigned int payload = 18; /* Sequence number + random bytes */
|
|
unsigned int padding = 16; /* Use minimum padding */
|
|
|
|
/* Only send if peer supports and accepts HB requests... */
|
|
if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
|
|
s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS) {
|
|
SSLerr(SSL_F_TLS1_HEARTBEAT, SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
|
|
return -1;
|
|
}
|
|
|
|
/* ...and there is none in flight yet... */
|
|
if (s->tlsext_hb_pending) {
|
|
SSLerr(SSL_F_TLS1_HEARTBEAT, SSL_R_TLS_HEARTBEAT_PENDING);
|
|
return -1;
|
|
}
|
|
|
|
/* ...and no handshake in progress. */
|
|
if (SSL_in_init(s) || s->in_handshake) {
|
|
SSLerr(SSL_F_TLS1_HEARTBEAT, SSL_R_UNEXPECTED_MESSAGE);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Check if padding is too long, payload and padding must not exceed 2^14
|
|
* - 3 = 16381 bytes in total.
|
|
*/
|
|
OPENSSL_assert(payload + padding <= 16381);
|
|
|
|
/*-
|
|
* Create HeartBeat message, we just use a sequence number
|
|
* as payload to distuingish different messages and add
|
|
* some random stuff.
|
|
* - Message Type, 1 byte
|
|
* - Payload Length, 2 bytes (unsigned int)
|
|
* - Payload, the sequence number (2 bytes uint)
|
|
* - Payload, random bytes (16 bytes uint)
|
|
* - Padding
|
|
*/
|
|
buf = OPENSSL_malloc(1 + 2 + payload + padding);
|
|
p = buf;
|
|
/* Message Type */
|
|
*p++ = TLS1_HB_REQUEST;
|
|
/* Payload length (18 bytes here) */
|
|
s2n(payload, p);
|
|
/* Sequence number */
|
|
s2n(s->tlsext_hb_seq, p);
|
|
/* 16 random bytes */
|
|
if (RAND_pseudo_bytes(p, 16) < 0) {
|
|
SSLerr(SSL_F_TLS1_HEARTBEAT, ERR_R_INTERNAL_ERROR);
|
|
goto err;
|
|
}
|
|
p += 16;
|
|
/* Random padding */
|
|
if (RAND_pseudo_bytes(p, padding) < 0) {
|
|
SSLerr(SSL_F_TLS1_HEARTBEAT, ERR_R_INTERNAL_ERROR);
|
|
goto err;
|
|
}
|
|
|
|
ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
|
|
if (ret >= 0) {
|
|
if (s->msg_callback)
|
|
s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
|
|
buf, 3 + payload + padding,
|
|
s, s->msg_callback_arg);
|
|
|
|
s->tlsext_hb_pending = 1;
|
|
}
|
|
|
|
err:
|
|
OPENSSL_free(buf);
|
|
|
|
return ret;
|
|
}
|
|
#endif
|