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995 lines
29 KiB
C
Executable File
995 lines
29 KiB
C
Executable File
/* $OpenBSD: t1_lib.c,v 1.186 2022/01/24 13:47:53 tb Exp $ */
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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/evp.h>
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#include <openssl/hmac.h>
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#include <openssl/objects.h>
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#include <openssl/ocsp.h>
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#include "bytestring.h"
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#include "ssl_locl.h"
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#include "ssl_sigalgs.h"
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#include "ssl_tlsext.h"
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static int tls_decrypt_ticket(SSL *s, CBS *ticket, int *alert,
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SSL_SESSION **psess);
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int
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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
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tls1_free(SSL *s)
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{
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if (s == NULL)
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return;
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free(s->internal->tlsext_session_ticket);
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ssl3_free(s);
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}
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void
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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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static const 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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NID_brainpoolP256r1, /* brainpoolP256r1 (26) */
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NID_brainpoolP384r1, /* brainpoolP384r1 (27) */
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NID_brainpoolP512r1, /* brainpoolP512r1 (28) */
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NID_X25519, /* X25519 (29) */
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};
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#if 0
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static const uint8_t ecformats_list[] = {
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TLSEXT_ECPOINTFORMAT_uncompressed,
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TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
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TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
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};
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#endif
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static const uint8_t ecformats_default[] = {
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TLSEXT_ECPOINTFORMAT_uncompressed,
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};
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#if 0
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static const uint16_t eccurves_list[] = {
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29, /* X25519 (29) */
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14, /* sect571r1 (14) */
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13, /* sect571k1 (13) */
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25, /* secp521r1 (25) */
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28, /* brainpoolP512r1 (28) */
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11, /* sect409k1 (11) */
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12, /* sect409r1 (12) */
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27, /* brainpoolP384r1 (27) */
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24, /* secp384r1 (24) */
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9, /* sect283k1 (9) */
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10, /* sect283r1 (10) */
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26, /* brainpoolP256r1 (26) */
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22, /* secp256k1 (22) */
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23, /* secp256r1 (23) */
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8, /* sect239k1 (8) */
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6, /* sect233k1 (6) */
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7, /* sect233r1 (7) */
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20, /* secp224k1 (20) */
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21, /* secp224r1 (21) */
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4, /* sect193r1 (4) */
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5, /* sect193r2 (5) */
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18, /* secp192k1 (18) */
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19, /* secp192r1 (19) */
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1, /* sect163k1 (1) */
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2, /* sect163r1 (2) */
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3, /* sect163r2 (3) */
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15, /* secp160k1 (15) */
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16, /* secp160r1 (16) */
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17, /* secp160r2 (17) */
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};
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#endif
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static const uint16_t eccurves_client_default[] = {
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29, /* X25519 (29) */
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23, /* secp256r1 (23) */
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24, /* secp384r1 (24) */
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25, /* secp521r1 (25) */
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};
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static const uint16_t eccurves_server_default[] = {
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29, /* X25519 (29) */
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23, /* secp256r1 (23) */
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24, /* secp384r1 (24) */
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};
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int
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tls1_ec_curve_id2nid(const uint16_t curve_id)
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{
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/* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
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if ((curve_id < 1) ||
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((unsigned int)curve_id > 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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uint16_t
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tls1_ec_nid2curve_id(const int nid)
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{
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/* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
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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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case NID_brainpoolP256r1: /* brainpoolP256r1 (26) */
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return 26;
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case NID_brainpoolP384r1: /* brainpoolP384r1 (27) */
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return 27;
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case NID_brainpoolP512r1: /* brainpoolP512r1 (28) */
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return 28;
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case NID_X25519: /* X25519 (29) */
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return 29;
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default:
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return 0;
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}
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}
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/*
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* Return the appropriate format list. If client_formats is non-zero, return
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* the client/session formats. Otherwise return the custom format list if one
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* exists, or the default formats if a custom list has not been specified.
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*/
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void
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tls1_get_formatlist(SSL *s, int client_formats, const uint8_t **pformats,
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size_t *pformatslen)
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{
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if (client_formats != 0) {
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*pformats = s->session->tlsext_ecpointformatlist;
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*pformatslen = s->session->tlsext_ecpointformatlist_length;
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return;
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}
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*pformats = s->internal->tlsext_ecpointformatlist;
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*pformatslen = s->internal->tlsext_ecpointformatlist_length;
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if (*pformats == NULL) {
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*pformats = ecformats_default;
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*pformatslen = sizeof(ecformats_default);
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}
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}
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/*
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* Return the appropriate group list. If client_groups is non-zero, return
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* the client/session groups. Otherwise return the custom group list if one
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* exists, or the default groups if a custom list has not been specified.
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*/
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void
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tls1_get_group_list(SSL *s, int client_groups, const uint16_t **pgroups,
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size_t *pgroupslen)
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{
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if (client_groups != 0) {
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*pgroups = s->session->tlsext_supportedgroups;
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*pgroupslen = s->session->tlsext_supportedgroups_length;
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return;
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}
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*pgroups = s->internal->tlsext_supportedgroups;
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*pgroupslen = s->internal->tlsext_supportedgroups_length;
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if (*pgroups != NULL)
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return;
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if (!s->server) {
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*pgroups = eccurves_client_default;
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*pgroupslen = sizeof(eccurves_client_default) / 2;
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} else {
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*pgroups = eccurves_server_default;
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*pgroupslen = sizeof(eccurves_server_default) / 2;
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}
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}
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int
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tls1_set_groups(uint16_t **out_group_ids, size_t *out_group_ids_len,
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const int *groups, size_t ngroups)
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{
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uint16_t *group_ids;
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size_t i;
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group_ids = calloc(ngroups, sizeof(uint16_t));
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if (group_ids == NULL)
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return 0;
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for (i = 0; i < ngroups; i++) {
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group_ids[i] = tls1_ec_nid2curve_id(groups[i]);
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if (group_ids[i] == 0) {
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free(group_ids);
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return 0;
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}
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}
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free(*out_group_ids);
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*out_group_ids = group_ids;
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*out_group_ids_len = ngroups;
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return 1;
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}
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int
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tls1_set_group_list(uint16_t **out_group_ids, size_t *out_group_ids_len,
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const char *groups)
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{
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uint16_t *new_group_ids, *group_ids = NULL;
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size_t ngroups = 0;
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char *gs, *p, *q;
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int nid;
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if ((gs = strdup(groups)) == NULL)
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return 0;
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q = gs;
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while ((p = strsep(&q, ":")) != NULL) {
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nid = OBJ_sn2nid(p);
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if (nid == NID_undef)
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nid = OBJ_ln2nid(p);
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if (nid == NID_undef)
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nid = EC_curve_nist2nid(p);
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if (nid == NID_undef)
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goto err;
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if ((new_group_ids = reallocarray(group_ids, ngroups + 1,
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sizeof(uint16_t))) == NULL)
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goto err;
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group_ids = new_group_ids;
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group_ids[ngroups] = tls1_ec_nid2curve_id(nid);
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if (group_ids[ngroups] == 0)
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goto err;
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ngroups++;
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}
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free(gs);
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free(*out_group_ids);
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*out_group_ids = group_ids;
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*out_group_ids_len = ngroups;
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return 1;
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err:
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free(gs);
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free(group_ids);
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return 0;
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}
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/* Check that a curve is one of our preferences. */
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int
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tls1_check_curve(SSL *s, const uint16_t curve_id)
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{
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const uint16_t *groups;
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size_t groupslen, i;
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tls1_get_group_list(s, 0, &groups, &groupslen);
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for (i = 0; i < groupslen; i++) {
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if (groups[i] == curve_id)
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return (1);
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}
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return (0);
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}
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int
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tls1_get_shared_curve(SSL *s)
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{
|
|
size_t preflen, supplen, i, j;
|
|
const uint16_t *pref, *supp;
|
|
unsigned long server_pref;
|
|
|
|
/* Cannot do anything on the client side. */
|
|
if (s->server == 0)
|
|
return (NID_undef);
|
|
|
|
/* Return first preference shared curve. */
|
|
server_pref = (s->internal->options & SSL_OP_CIPHER_SERVER_PREFERENCE);
|
|
tls1_get_group_list(s, (server_pref == 0), &pref, &preflen);
|
|
tls1_get_group_list(s, (server_pref != 0), &supp, &supplen);
|
|
|
|
for (i = 0; i < preflen; i++) {
|
|
for (j = 0; j < supplen; j++) {
|
|
if (pref[i] == supp[j])
|
|
return (tls1_ec_curve_id2nid(pref[i]));
|
|
}
|
|
}
|
|
return (NID_undef);
|
|
}
|
|
|
|
/* For an EC key set TLS ID and required compression based on parameters. */
|
|
static int
|
|
tls1_set_ec_id(uint16_t *curve_id, uint8_t *comp_id, EC_KEY *ec)
|
|
{
|
|
const EC_GROUP *grp;
|
|
const EC_METHOD *meth;
|
|
int prime_field;
|
|
int nid;
|
|
|
|
if (ec == NULL)
|
|
return (0);
|
|
|
|
/* Determine whether the curve is defined over a prime field. */
|
|
if ((grp = EC_KEY_get0_group(ec)) == NULL)
|
|
return (0);
|
|
if ((meth = EC_GROUP_method_of(grp)) == NULL)
|
|
return (0);
|
|
prime_field = (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field);
|
|
|
|
/* Determine curve ID - NID_undef results in a curve ID of zero. */
|
|
nid = EC_GROUP_get_curve_name(grp);
|
|
/* If we have an ID set it, otherwise set arbitrary explicit curve. */
|
|
if ((*curve_id = tls1_ec_nid2curve_id(nid)) == 0)
|
|
*curve_id = prime_field ? 0xff01 : 0xff02;
|
|
|
|
if (comp_id == NULL)
|
|
return (1);
|
|
|
|
/* Specify the compression identifier. */
|
|
if (EC_KEY_get0_public_key(ec) == NULL)
|
|
return (0);
|
|
*comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
|
|
if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED) {
|
|
*comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
|
|
if (prime_field)
|
|
*comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
/* Check that an EC key is compatible with extensions. */
|
|
static int
|
|
tls1_check_ec_key(SSL *s, const uint16_t *curve_id, const uint8_t *comp_id)
|
|
{
|
|
size_t groupslen, formatslen, i;
|
|
const uint16_t *groups;
|
|
const uint8_t *formats;
|
|
|
|
/*
|
|
* Check point formats extension if present, otherwise everything
|
|
* is supported (see RFC4492).
|
|
*/
|
|
tls1_get_formatlist(s, 1, &formats, &formatslen);
|
|
if (comp_id != NULL && formats != NULL) {
|
|
for (i = 0; i < formatslen; i++) {
|
|
if (formats[i] == *comp_id)
|
|
break;
|
|
}
|
|
if (i == formatslen)
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Check curve list if present, otherwise everything is supported.
|
|
*/
|
|
tls1_get_group_list(s, 1, &groups, &groupslen);
|
|
if (curve_id != NULL && groups != NULL) {
|
|
for (i = 0; i < groupslen; i++) {
|
|
if (groups[i] == *curve_id)
|
|
break;
|
|
}
|
|
if (i == groupslen)
|
|
return (0);
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
/* Check EC server key is compatible with client extensions. */
|
|
int
|
|
tls1_check_ec_server_key(SSL *s)
|
|
{
|
|
SSL_CERT_PKEY *cpk = s->cert->pkeys + SSL_PKEY_ECC;
|
|
uint16_t curve_id;
|
|
uint8_t comp_id;
|
|
EC_KEY *eckey;
|
|
EVP_PKEY *pkey;
|
|
|
|
if (cpk->x509 == NULL || cpk->privatekey == NULL)
|
|
return (0);
|
|
if ((pkey = X509_get0_pubkey(cpk->x509)) == NULL)
|
|
return (0);
|
|
if ((eckey = EVP_PKEY_get0_EC_KEY(pkey)) == NULL)
|
|
return (0);
|
|
if (!tls1_set_ec_id(&curve_id, &comp_id, eckey))
|
|
return (0);
|
|
|
|
return tls1_check_ec_key(s, &curve_id, &comp_id);
|
|
}
|
|
|
|
int
|
|
ssl_check_clienthello_tlsext_early(SSL *s)
|
|
{
|
|
int ret = SSL_TLSEXT_ERR_NOACK;
|
|
int al = SSL_AD_UNRECOGNIZED_NAME;
|
|
|
|
/* 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.
|
|
*/
|
|
|
|
if (s->ctx != NULL && s->ctx->internal->tlsext_servername_callback != 0)
|
|
ret = s->ctx->internal->tlsext_servername_callback(s, &al,
|
|
s->ctx->internal->tlsext_servername_arg);
|
|
else if (s->initial_ctx != NULL && s->initial_ctx->internal->tlsext_servername_callback != 0)
|
|
ret = s->initial_ctx->internal->tlsext_servername_callback(s, &al,
|
|
s->initial_ctx->internal->tlsext_servername_arg);
|
|
|
|
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:
|
|
default:
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
int
|
|
ssl_check_clienthello_tlsext_late(SSL *s)
|
|
{
|
|
int ret = SSL_TLSEXT_ERR_OK;
|
|
int al = 0; /* XXX gcc3 */
|
|
|
|
/* 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->internal->tlsext_status_cb) {
|
|
int r;
|
|
SSL_CERT_PKEY *certpkey;
|
|
certpkey = ssl_get_server_send_pkey(s);
|
|
/* If no certificate can't return certificate status */
|
|
if (certpkey == NULL) {
|
|
s->internal->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->internal->tlsext_status_cb(s,
|
|
s->ctx->internal->tlsext_status_arg);
|
|
switch (r) {
|
|
/* We don't want to send a status request response */
|
|
case SSL_TLSEXT_ERR_NOACK:
|
|
s->internal->tlsext_status_expected = 0;
|
|
break;
|
|
/* status request response should be sent */
|
|
case SSL_TLSEXT_ERR_OK:
|
|
if (s->internal->tlsext_ocsp_resp)
|
|
s->internal->tlsext_status_expected = 1;
|
|
else
|
|
s->internal->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->internal->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;
|
|
|
|
ret = SSL_TLSEXT_ERR_OK;
|
|
|
|
if (s->ctx != NULL && s->ctx->internal->tlsext_servername_callback != 0)
|
|
ret = s->ctx->internal->tlsext_servername_callback(s, &al,
|
|
s->ctx->internal->tlsext_servername_arg);
|
|
else if (s->initial_ctx != NULL && s->initial_ctx->internal->tlsext_servername_callback != 0)
|
|
ret = s->initial_ctx->internal->tlsext_servername_callback(s, &al,
|
|
s->initial_ctx->internal->tlsext_servername_arg);
|
|
|
|
/* If we've requested certificate status and we wont get one
|
|
* tell the callback
|
|
*/
|
|
if ((s->tlsext_status_type != -1) && !(s->internal->tlsext_status_expected) &&
|
|
s->ctx && s->ctx->internal->tlsext_status_cb) {
|
|
int r;
|
|
|
|
free(s->internal->tlsext_ocsp_resp);
|
|
s->internal->tlsext_ocsp_resp = NULL;
|
|
s->internal->tlsext_ocsp_resp_len = 0;
|
|
|
|
r = s->ctx->internal->tlsext_status_cb(s,
|
|
s->ctx->internal->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:
|
|
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.
|
|
*
|
|
* ext_block: a CBS for the ClientHello extensions block.
|
|
* ret: (output) on return, if a ticket was decrypted, then this is set to
|
|
* point to the resulting session.
|
|
*
|
|
* If s->internal->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->internal->tlsext_ticket_expected be set to 1.
|
|
*
|
|
* Returns:
|
|
* TLS1_TICKET_FATAL_ERROR: error from parsing or decrypting the ticket.
|
|
* TLS1_TICKET_NONE: no ticket was found (or was ignored, based on settings).
|
|
* TLS1_TICKET_EMPTY: a zero length extension was found, indicating that the
|
|
* client supports session tickets but doesn't currently have one to offer.
|
|
* TLS1_TICKET_NOT_DECRYPTED: either s->internal->tls_session_secret_cb was
|
|
* set, or a ticket was offered but couldn't be decrypted because of a
|
|
* non-fatal error.
|
|
* TLS1_TICKET_DECRYPTED: a ticket was successfully decrypted and *ret was set.
|
|
*
|
|
* Side effects:
|
|
* Sets s->internal->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->internal->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->internal->tlsext_ticket_expected is set to 0.
|
|
*/
|
|
int
|
|
tls1_process_ticket(SSL *s, CBS *ext_block, int *alert, SSL_SESSION **ret)
|
|
{
|
|
CBS extensions, ext_data;
|
|
uint16_t ext_type = 0;
|
|
|
|
s->internal->tlsext_ticket_expected = 0;
|
|
*ret = NULL;
|
|
|
|
/*
|
|
* If tickets disabled behave as if no ticket present to permit stateful
|
|
* resumption.
|
|
*/
|
|
if (SSL_get_options(s) & SSL_OP_NO_TICKET)
|
|
return TLS1_TICKET_NONE;
|
|
|
|
/*
|
|
* An empty extensions block is valid, but obviously does not contain
|
|
* a session ticket.
|
|
*/
|
|
if (CBS_len(ext_block) == 0)
|
|
return TLS1_TICKET_NONE;
|
|
|
|
if (!CBS_get_u16_length_prefixed(ext_block, &extensions)) {
|
|
*alert = SSL_AD_DECODE_ERROR;
|
|
return TLS1_TICKET_FATAL_ERROR;
|
|
}
|
|
|
|
while (CBS_len(&extensions) > 0) {
|
|
if (!CBS_get_u16(&extensions, &ext_type) ||
|
|
!CBS_get_u16_length_prefixed(&extensions, &ext_data)) {
|
|
*alert = SSL_AD_DECODE_ERROR;
|
|
return TLS1_TICKET_FATAL_ERROR;
|
|
}
|
|
|
|
if (ext_type == TLSEXT_TYPE_session_ticket)
|
|
break;
|
|
}
|
|
|
|
if (ext_type != TLSEXT_TYPE_session_ticket)
|
|
return TLS1_TICKET_NONE;
|
|
|
|
if (CBS_len(&ext_data) == 0) {
|
|
/*
|
|
* The client will accept a ticket but does not currently
|
|
* have one.
|
|
*/
|
|
s->internal->tlsext_ticket_expected = 1;
|
|
return TLS1_TICKET_EMPTY;
|
|
}
|
|
|
|
if (s->internal->tls_session_secret_cb != NULL) {
|
|
/*
|
|
* Indicate that the ticket could not be decrypted rather than
|
|
* generating the session from ticket now, trigger abbreviated
|
|
* handshake based on external mechanism to calculate the master
|
|
* secret later.
|
|
*/
|
|
return TLS1_TICKET_NOT_DECRYPTED;
|
|
}
|
|
|
|
return tls_decrypt_ticket(s, &ext_data, alert, ret);
|
|
}
|
|
|
|
/* tls_decrypt_ticket attempts to decrypt a session ticket.
|
|
*
|
|
* ticket: a CBS containing the body of the session ticket extension.
|
|
* psess: (output) on return, if a ticket was decrypted, then this is set to
|
|
* point to the resulting session.
|
|
*
|
|
* Returns:
|
|
* TLS1_TICKET_FATAL_ERROR: error from parsing or decrypting the ticket.
|
|
* TLS1_TICKET_NOT_DECRYPTED: the ticket couldn't be decrypted.
|
|
* TLS1_TICKET_DECRYPTED: a ticket was decrypted and *psess was set.
|
|
*/
|
|
static int
|
|
tls_decrypt_ticket(SSL *s, CBS *ticket, int *alert, SSL_SESSION **psess)
|
|
{
|
|
CBS ticket_name, ticket_iv, ticket_encdata, ticket_hmac;
|
|
SSL_SESSION *sess = NULL;
|
|
unsigned char *sdec = NULL;
|
|
size_t sdec_len = 0;
|
|
const unsigned char *p;
|
|
unsigned char hmac[EVP_MAX_MD_SIZE];
|
|
HMAC_CTX *hctx = NULL;
|
|
EVP_CIPHER_CTX *cctx = NULL;
|
|
SSL_CTX *tctx = s->initial_ctx;
|
|
int slen, hlen;
|
|
int alert_desc = SSL_AD_INTERNAL_ERROR;
|
|
int ret = TLS1_TICKET_FATAL_ERROR;
|
|
|
|
*psess = NULL;
|
|
|
|
if (!CBS_get_bytes(ticket, &ticket_name, 16))
|
|
goto derr;
|
|
|
|
/*
|
|
* Initialize session ticket encryption and HMAC contexts.
|
|
*/
|
|
if ((cctx = EVP_CIPHER_CTX_new()) == NULL)
|
|
goto err;
|
|
if ((hctx = HMAC_CTX_new()) == NULL)
|
|
goto err;
|
|
|
|
if (tctx->internal->tlsext_ticket_key_cb != NULL) {
|
|
int rv;
|
|
|
|
/*
|
|
* The API guarantees EVP_MAX_IV_LENGTH bytes of space for
|
|
* the iv to tlsext_ticket_key_cb(). Since the total space
|
|
* required for a session cookie is never less than this,
|
|
* this check isn't too strict. The exact check comes later.
|
|
*/
|
|
if (CBS_len(ticket) < EVP_MAX_IV_LENGTH)
|
|
goto derr;
|
|
|
|
if ((rv = tctx->internal->tlsext_ticket_key_cb(s,
|
|
(unsigned char *)CBS_data(&ticket_name),
|
|
(unsigned char *)CBS_data(ticket), cctx, hctx, 0)) < 0)
|
|
goto err;
|
|
if (rv == 0)
|
|
goto derr;
|
|
if (rv == 2) {
|
|
/* Renew ticket. */
|
|
s->internal->tlsext_ticket_expected = 1;
|
|
}
|
|
|
|
/*
|
|
* Now that the cipher context is initialised, we can extract
|
|
* the IV since its length is known.
|
|
*/
|
|
if (!CBS_get_bytes(ticket, &ticket_iv,
|
|
EVP_CIPHER_CTX_iv_length(cctx)))
|
|
goto derr;
|
|
} else {
|
|
/* Check that the key name matches. */
|
|
if (!CBS_mem_equal(&ticket_name,
|
|
tctx->internal->tlsext_tick_key_name,
|
|
sizeof(tctx->internal->tlsext_tick_key_name)))
|
|
goto derr;
|
|
if (!CBS_get_bytes(ticket, &ticket_iv,
|
|
EVP_CIPHER_iv_length(EVP_aes_128_cbc())))
|
|
goto derr;
|
|
if (!EVP_DecryptInit_ex(cctx, EVP_aes_128_cbc(), NULL,
|
|
tctx->internal->tlsext_tick_aes_key, CBS_data(&ticket_iv)))
|
|
goto err;
|
|
if (!HMAC_Init_ex(hctx, tctx->internal->tlsext_tick_hmac_key,
|
|
sizeof(tctx->internal->tlsext_tick_hmac_key), EVP_sha256(),
|
|
NULL))
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* Attempt to process session ticket.
|
|
*/
|
|
|
|
if ((hlen = HMAC_size(hctx)) < 0)
|
|
goto err;
|
|
|
|
if (hlen > CBS_len(ticket))
|
|
goto derr;
|
|
if (!CBS_get_bytes(ticket, &ticket_encdata, CBS_len(ticket) - hlen))
|
|
goto derr;
|
|
if (!CBS_get_bytes(ticket, &ticket_hmac, hlen))
|
|
goto derr;
|
|
if (CBS_len(ticket) != 0) {
|
|
alert_desc = SSL_AD_DECODE_ERROR;
|
|
goto err;
|
|
}
|
|
|
|
/* Check HMAC of encrypted ticket. */
|
|
if (HMAC_Update(hctx, CBS_data(&ticket_name),
|
|
CBS_len(&ticket_name)) <= 0)
|
|
goto err;
|
|
if (HMAC_Update(hctx, CBS_data(&ticket_iv),
|
|
CBS_len(&ticket_iv)) <= 0)
|
|
goto err;
|
|
if (HMAC_Update(hctx, CBS_data(&ticket_encdata),
|
|
CBS_len(&ticket_encdata)) <= 0)
|
|
goto err;
|
|
if (HMAC_Final(hctx, hmac, &hlen) <= 0)
|
|
goto err;
|
|
|
|
if (!CBS_mem_equal(&ticket_hmac, hmac, hlen))
|
|
goto derr;
|
|
|
|
/* Attempt to decrypt session data. */
|
|
sdec_len = CBS_len(&ticket_encdata);
|
|
if ((sdec = calloc(1, sdec_len)) == NULL)
|
|
goto err;
|
|
if (EVP_DecryptUpdate(cctx, sdec, &slen, CBS_data(&ticket_encdata),
|
|
CBS_len(&ticket_encdata)) <= 0)
|
|
goto derr;
|
|
if (EVP_DecryptFinal_ex(cctx, sdec + slen, &hlen) <= 0)
|
|
goto derr;
|
|
|
|
slen += hlen;
|
|
|
|
/*
|
|
* For session parse failures, indicate that we need to send a new
|
|
* ticket.
|
|
*/
|
|
p = sdec;
|
|
if ((sess = d2i_SSL_SESSION(NULL, &p, slen)) == NULL)
|
|
goto derr;
|
|
*psess = sess;
|
|
sess = NULL;
|
|
|
|
ret = TLS1_TICKET_DECRYPTED;
|
|
goto done;
|
|
|
|
derr:
|
|
ERR_clear_error();
|
|
s->internal->tlsext_ticket_expected = 1;
|
|
ret = TLS1_TICKET_NOT_DECRYPTED;
|
|
goto done;
|
|
|
|
err:
|
|
*alert = alert_desc;
|
|
ret = TLS1_TICKET_FATAL_ERROR;
|
|
goto done;
|
|
|
|
done:
|
|
freezero(sdec, sdec_len);
|
|
EVP_CIPHER_CTX_free(cctx);
|
|
HMAC_CTX_free(hctx);
|
|
SSL_SESSION_free(sess);
|
|
|
|
return ret;
|
|
}
|