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ext-libressl-portable/ssl/t1_lib.c

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/* $OpenBSD: t1_lib.c,v 1.137 2017/08/30 16:44:37 jsing Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
/* ====================================================================
* Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <stdio.h>
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/objects.h>
#include <openssl/ocsp.h>
#include "ssl_locl.h"
#include "bytestring.h"
#include "ssl_tlsext.h"
static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
const unsigned char *sess_id, int sesslen,
SSL_SESSION **psess);
SSL3_ENC_METHOD TLSv1_enc_data = {
.enc = tls1_enc,
.enc_flags = 0,
};
SSL3_ENC_METHOD TLSv1_1_enc_data = {
.enc = tls1_enc,
.enc_flags = SSL_ENC_FLAG_EXPLICIT_IV,
};
SSL3_ENC_METHOD TLSv1_2_enc_data = {
.enc = tls1_enc,
.enc_flags = SSL_ENC_FLAG_EXPLICIT_IV|SSL_ENC_FLAG_SIGALGS|
SSL_ENC_FLAG_SHA256_PRF|SSL_ENC_FLAG_TLS1_2_CIPHERS,
};
long
tls1_default_timeout(void)
{
/* 2 hours, the 24 hours mentioned in the TLSv1 spec
* is way too long for http, the cache would over fill */
return (60 * 60 * 2);
}
int
tls1_new(SSL *s)
{
if (!ssl3_new(s))
return (0);
s->method->internal->ssl_clear(s);
return (1);
}
void
tls1_free(SSL *s)
{
if (s == NULL)
return;
free(s->internal->tlsext_session_ticket);
ssl3_free(s);
}
void
tls1_clear(SSL *s)
{
ssl3_clear(s);
s->version = s->method->internal->version;
}
static int nid_list[] = {
NID_sect163k1, /* sect163k1 (1) */
NID_sect163r1, /* sect163r1 (2) */
NID_sect163r2, /* sect163r2 (3) */
NID_sect193r1, /* sect193r1 (4) */
NID_sect193r2, /* sect193r2 (5) */
NID_sect233k1, /* sect233k1 (6) */
NID_sect233r1, /* sect233r1 (7) */
NID_sect239k1, /* sect239k1 (8) */
NID_sect283k1, /* sect283k1 (9) */
NID_sect283r1, /* sect283r1 (10) */
NID_sect409k1, /* sect409k1 (11) */
NID_sect409r1, /* sect409r1 (12) */
NID_sect571k1, /* sect571k1 (13) */
NID_sect571r1, /* sect571r1 (14) */
NID_secp160k1, /* secp160k1 (15) */
NID_secp160r1, /* secp160r1 (16) */
NID_secp160r2, /* secp160r2 (17) */
NID_secp192k1, /* secp192k1 (18) */
NID_X9_62_prime192v1, /* secp192r1 (19) */
NID_secp224k1, /* secp224k1 (20) */
NID_secp224r1, /* secp224r1 (21) */
NID_secp256k1, /* secp256k1 (22) */
NID_X9_62_prime256v1, /* secp256r1 (23) */
NID_secp384r1, /* secp384r1 (24) */
NID_secp521r1, /* secp521r1 (25) */
NID_brainpoolP256r1, /* brainpoolP256r1 (26) */
NID_brainpoolP384r1, /* brainpoolP384r1 (27) */
NID_brainpoolP512r1, /* brainpoolP512r1 (28) */
NID_X25519, /* X25519 (29) */
};
#if 0
static const uint8_t ecformats_list[] = {
TLSEXT_ECPOINTFORMAT_uncompressed,
TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
};
#endif
static const uint8_t ecformats_default[] = {
TLSEXT_ECPOINTFORMAT_uncompressed,
};
#if 0
static const uint16_t eccurves_list[] = {
29, /* X25519 (29) */
14, /* sect571r1 (14) */
13, /* sect571k1 (13) */
25, /* secp521r1 (25) */
28, /* brainpoolP512r1 (28) */
11, /* sect409k1 (11) */
12, /* sect409r1 (12) */
27, /* brainpoolP384r1 (27) */
24, /* secp384r1 (24) */
9, /* sect283k1 (9) */
10, /* sect283r1 (10) */
26, /* brainpoolP256r1 (26) */
22, /* secp256k1 (22) */
23, /* secp256r1 (23) */
8, /* sect239k1 (8) */
6, /* sect233k1 (6) */
7, /* sect233r1 (7) */
20, /* secp224k1 (20) */
21, /* secp224r1 (21) */
4, /* sect193r1 (4) */
5, /* sect193r2 (5) */
18, /* secp192k1 (18) */
19, /* secp192r1 (19) */
1, /* sect163k1 (1) */
2, /* sect163r1 (2) */
3, /* sect163r2 (3) */
15, /* secp160k1 (15) */
16, /* secp160r1 (16) */
17, /* secp160r2 (17) */
};
#endif
static const uint16_t eccurves_default[] = {
29, /* X25519 (29) */
23, /* secp256r1 (23) */
24, /* secp384r1 (24) */
};
int
tls1_ec_curve_id2nid(const uint16_t curve_id)
{
/* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
if ((curve_id < 1) ||
((unsigned int)curve_id > sizeof(nid_list) / sizeof(nid_list[0])))
return 0;
return nid_list[curve_id - 1];
}
uint16_t
tls1_ec_nid2curve_id(const int nid)
{
/* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
switch (nid) {
case NID_sect163k1: /* sect163k1 (1) */
return 1;
case NID_sect163r1: /* sect163r1 (2) */
return 2;
case NID_sect163r2: /* sect163r2 (3) */
return 3;
case NID_sect193r1: /* sect193r1 (4) */
return 4;
case NID_sect193r2: /* sect193r2 (5) */
return 5;
case NID_sect233k1: /* sect233k1 (6) */
return 6;
case NID_sect233r1: /* sect233r1 (7) */
return 7;
case NID_sect239k1: /* sect239k1 (8) */
return 8;
case NID_sect283k1: /* sect283k1 (9) */
return 9;
case NID_sect283r1: /* sect283r1 (10) */
return 10;
case NID_sect409k1: /* sect409k1 (11) */
return 11;
case NID_sect409r1: /* sect409r1 (12) */
return 12;
case NID_sect571k1: /* sect571k1 (13) */
return 13;
case NID_sect571r1: /* sect571r1 (14) */
return 14;
case NID_secp160k1: /* secp160k1 (15) */
return 15;
case NID_secp160r1: /* secp160r1 (16) */
return 16;
case NID_secp160r2: /* secp160r2 (17) */
return 17;
case NID_secp192k1: /* secp192k1 (18) */
return 18;
case NID_X9_62_prime192v1: /* secp192r1 (19) */
return 19;
case NID_secp224k1: /* secp224k1 (20) */
return 20;
case NID_secp224r1: /* secp224r1 (21) */
return 21;
case NID_secp256k1: /* secp256k1 (22) */
return 22;
case NID_X9_62_prime256v1: /* secp256r1 (23) */
return 23;
case NID_secp384r1: /* secp384r1 (24) */
return 24;
case NID_secp521r1: /* secp521r1 (25) */
return 25;
case NID_brainpoolP256r1: /* brainpoolP256r1 (26) */
return 26;
case NID_brainpoolP384r1: /* brainpoolP384r1 (27) */
return 27;
case NID_brainpoolP512r1: /* brainpoolP512r1 (28) */
return 28;
case NID_X25519: /* X25519 (29) */
return 29;
default:
return 0;
}
}
/*
* Return the appropriate format list. If client_formats is non-zero, return
* the client/session formats. Otherwise return the custom format list if one
* exists, or the default formats if a custom list has not been specified.
*/
void
tls1_get_formatlist(SSL *s, int client_formats, const uint8_t **pformats,
size_t *pformatslen)
{
if (client_formats != 0) {
*pformats = SSI(s)->tlsext_ecpointformatlist;
*pformatslen = SSI(s)->tlsext_ecpointformatlist_length;
return;
}
*pformats = s->internal->tlsext_ecpointformatlist;
*pformatslen = s->internal->tlsext_ecpointformatlist_length;
if (*pformats == NULL) {
*pformats = ecformats_default;
*pformatslen = sizeof(ecformats_default);
}
}
/*
* Return the appropriate curve list. If client_curves is non-zero, return
* the client/session curves. Otherwise return the custom curve list if one
* exists, or the default curves if a custom list has not been specified.
*/
void
tls1_get_curvelist(SSL *s, int client_curves, const uint16_t **pcurves,
size_t *pcurveslen)
{
if (client_curves != 0) {
*pcurves = SSI(s)->tlsext_supportedgroups;
*pcurveslen = SSI(s)->tlsext_supportedgroups_length;
return;
}
*pcurves = s->internal->tlsext_supportedgroups;
*pcurveslen = s->internal->tlsext_supportedgroups_length;
if (*pcurves == NULL) {
*pcurves = eccurves_default;
*pcurveslen = sizeof(eccurves_default) / 2;
}
}
int
tls1_set_groups(uint16_t **out_group_ids, size_t *out_group_ids_len,
const int *groups, size_t ngroups)
{
uint16_t *group_ids;
size_t i;
group_ids = calloc(ngroups, sizeof(uint16_t));
if (group_ids == NULL)
return 0;
for (i = 0; i < ngroups; i++) {
group_ids[i] = tls1_ec_nid2curve_id(groups[i]);
if (group_ids[i] == 0) {
free(group_ids);
return 0;
}
}
free(*out_group_ids);
*out_group_ids = group_ids;
*out_group_ids_len = ngroups;
return 1;
}
int
tls1_set_groups_list(uint16_t **out_group_ids, size_t *out_group_ids_len,
const char *groups)
{
uint16_t *new_group_ids, *group_ids = NULL;
size_t ngroups = 0;
char *gs, *p, *q;
int nid;
if ((gs = strdup(groups)) == NULL)
return 0;
q = gs;
while ((p = strsep(&q, ":")) != NULL) {
nid = OBJ_sn2nid(p);
if (nid == NID_undef)
nid = OBJ_ln2nid(p);
if (nid == NID_undef)
nid = EC_curve_nist2nid(p);
if (nid == NID_undef)
goto err;
if ((new_group_ids = reallocarray(group_ids, ngroups + 1,
sizeof(uint16_t))) == NULL)
goto err;
group_ids = new_group_ids;
group_ids[ngroups] = tls1_ec_nid2curve_id(nid);
if (group_ids[ngroups] == 0)
goto err;
ngroups++;
}
free(gs);
free(*out_group_ids);
*out_group_ids = group_ids;
*out_group_ids_len = ngroups;
return 1;
err:
free(gs);
free(group_ids);
return 0;
}
/* Check that a curve is one of our preferences. */
int
tls1_check_curve(SSL *s, const uint16_t curve_id)
{
const uint16_t *curves;
size_t curveslen, i;
tls1_get_curvelist(s, 0, &curves, &curveslen);
for (i = 0; i < curveslen; i++) {
if (curves[i] == curve_id)
return (1);
}
return (0);
}
int
tls1_get_shared_curve(SSL *s)
{
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_curvelist(s, (server_pref == 0), &pref, &preflen);
tls1_get_curvelist(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 is_prime = 0;
int nid, id;
if (ec == NULL)
return (0);
/* Determine if it is a prime field. */
if ((grp = EC_KEY_get0_group(ec)) == NULL)
return (0);
if ((meth = EC_GROUP_method_of(grp)) == NULL)
return (0);
if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field)
is_prime = 1;
/* Determine curve ID. */
nid = EC_GROUP_get_curve_name(grp);
id = tls1_ec_nid2curve_id(nid);
/* If we have an ID set it, otherwise set arbitrary explicit curve. */
if (id != 0)
*curve_id = id;
else
*curve_id = is_prime ? 0xff01 : 0xff02;
/* Specify the compression identifier. */
if (comp_id != NULL) {
if (EC_KEY_get0_public_key(ec) == NULL)
return (0);
if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED) {
*comp_id = is_prime ?
TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime :
TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
} else {
*comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
}
}
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 curveslen, formatslen, i;
const uint16_t *curves;
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_curvelist(s, 1, &curves, &curveslen);
if (curve_id != NULL && curves != NULL) {
for (i = 0; i < curveslen; i++) {
if (curves[i] == *curve_id)
break;
}
if (i == curveslen)
return (0);
}
return (1);
}
/* Check EC server key is compatible with client extensions. */
int
tls1_check_ec_server_key(SSL *s)
{
CERT_PKEY *cpk = s->cert->pkeys + SSL_PKEY_ECC;
uint16_t curve_id;
uint8_t comp_id;
EVP_PKEY *pkey;
int rv;
if (cpk->x509 == NULL || cpk->privatekey == NULL)
return (0);
if ((pkey = X509_get_pubkey(cpk->x509)) == NULL)
return (0);
rv = tls1_set_ec_id(&curve_id, &comp_id, pkey->pkey.ec);
EVP_PKEY_free(pkey);
if (rv != 1)
return (0);
return tls1_check_ec_key(s, &curve_id, &comp_id);
}
/* Check EC temporary key is compatible with client extensions. */
int
tls1_check_ec_tmp_key(SSL *s)
{
EC_KEY *ec = s->cert->ecdh_tmp;
uint16_t curve_id;
/* Need a shared curve. */
if (tls1_get_shared_curve(s) != NID_undef)
return (1);
if (ec == NULL)
return (0);
if (tls1_set_ec_id(&curve_id, NULL, ec) != 1)
return (0);
return tls1_check_ec_key(s, &curve_id, NULL);
}
/*
* List of supported signature algorithms and hashes. Should make this
* customisable at some point, for now include everything we support.
*/
static unsigned char tls12_sigalgs[] = {
TLSEXT_hash_sha512, TLSEXT_signature_rsa,
TLSEXT_hash_sha512, TLSEXT_signature_ecdsa,
#ifndef OPENSSL_NO_GOST
TLSEXT_hash_streebog_512, TLSEXT_signature_gostr12_512,
#endif
TLSEXT_hash_sha384, TLSEXT_signature_rsa,
TLSEXT_hash_sha384, TLSEXT_signature_ecdsa,
TLSEXT_hash_sha256, TLSEXT_signature_rsa,
TLSEXT_hash_sha256, TLSEXT_signature_ecdsa,
#ifndef OPENSSL_NO_GOST
TLSEXT_hash_streebog_256, TLSEXT_signature_gostr12_256,
TLSEXT_hash_gost94, TLSEXT_signature_gostr01,
#endif
TLSEXT_hash_sha224, TLSEXT_signature_rsa,
TLSEXT_hash_sha224, TLSEXT_signature_ecdsa,
TLSEXT_hash_sha1, TLSEXT_signature_rsa,
TLSEXT_hash_sha1, TLSEXT_signature_ecdsa,
};
void
tls12_get_req_sig_algs(SSL *s, unsigned char **sigalgs, size_t *sigalgs_len)
{
*sigalgs = tls12_sigalgs;
*sigalgs_len = sizeof(tls12_sigalgs);
}
unsigned char *
ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
{
size_t len;
CBB cbb;
if (p >= limit)
return NULL;
if (!CBB_init_fixed(&cbb, p, limit - p))
return NULL;
if (!tlsext_clienthello_build(s, &cbb)) {
CBB_cleanup(&cbb);
return NULL;
}
if (!CBB_finish(&cbb, NULL, &len)) {
CBB_cleanup(&cbb);
return NULL;
}
return (p + len);
}
unsigned char *
ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
{
size_t len;
CBB cbb;
if (p >= limit)
return NULL;
if (!CBB_init_fixed(&cbb, p, limit - p))
return NULL;
if (!tlsext_serverhello_build(s, &cbb)) {
CBB_cleanup(&cbb);
return NULL;
}
if (!CBB_finish(&cbb, NULL, &len)) {
CBB_cleanup(&cbb);
return NULL;
}
return (p + len);
}
int
ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d,
int n, int *al)
{
unsigned short type;
unsigned short size;
unsigned short len;
unsigned char *data = *p;
unsigned char *end = d + n;
CBS cbs;
s->internal->servername_done = 0;
s->tlsext_status_type = -1;
S3I(s)->renegotiate_seen = 0;
free(S3I(s)->alpn_selected);
S3I(s)->alpn_selected = NULL;
s->internal->srtp_profile = NULL;
if (data == end)
goto ri_check;
if (end - data < 2)
goto err;
n2s(data, len);
if (end - data != len)
goto err;
while (end - data >= 4) {
n2s(data, type);
n2s(data, size);
if (end - data < size)
goto err;
if (s->internal->tlsext_debug_cb)
s->internal->tlsext_debug_cb(s, 0, type, data, size,
s->internal->tlsext_debug_arg);
CBS_init(&cbs, data, size);
if (!tlsext_clienthello_parse_one(s, &cbs, type, al))
return 0;
data += size;
}
/* Spurious data on the end */
if (data != end)
goto err;
*p = data;
ri_check:
/* Need RI if renegotiating */
if (!S3I(s)->renegotiate_seen && s->internal->renegotiate) {
*al = SSL_AD_HANDSHAKE_FAILURE;
SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
return 0;
}
return 1;
err:
*al = SSL_AD_DECODE_ERROR;
return 0;
}
int
ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, size_t n, int *al)
{
unsigned short type;
unsigned short size;
unsigned short len;
unsigned char *data = *p;
unsigned char *end = *p + n;
CBS cbs;
S3I(s)->renegotiate_seen = 0;
free(S3I(s)->alpn_selected);
S3I(s)->alpn_selected = NULL;
if (data == end)
goto ri_check;
if (end - data < 2)
goto err;
n2s(data, len);
if (end - data != len)
goto err;
while (end - data >= 4) {
n2s(data, type);
n2s(data, size);
if (end - data < size)
goto err;
if (s->internal->tlsext_debug_cb)
s->internal->tlsext_debug_cb(s, 1, type, data, size,
s->internal->tlsext_debug_arg);
CBS_init(&cbs, data, size);
if (!tlsext_serverhello_parse_one(s, &cbs, type, al))
return 0;
data += size;
}
if (data != end) {
*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 (!S3I(s)->renegotiate_seen &&
!(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) {
*al = SSL_AD_HANDSHAKE_FAILURE;
SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
return 0;
}
return 1;
err:
*al = SSL_AD_DECODE_ERROR;
return 0;
}
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:
s->internal->servername_done = 0;
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;
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;
/* Set resp to NULL, resplen to -1 so callback knows
* there is no response.
*/
free(s->internal->tlsext_ocsp_resp);
s->internal->tlsext_ocsp_resp = NULL;
s->internal->tlsext_ocsp_resplen = -1;
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:
s->internal->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->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:
* -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->internal->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->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, const unsigned char *session, int session_len,
const unsigned char *limit, SSL_SESSION **ret)
{
/* Point after session ID in client hello */
CBS session_id, cookie, cipher_list, compress_algo, extensions;
*ret = NULL;
s->internal->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 (!limit)
return 0;
if (limit < session)
return -1;
CBS_init(&session_id, session, limit - session);
/* Skip past the session id */
if (!CBS_skip(&session_id, session_len))
return -1;
/* Skip past DTLS cookie */
if (SSL_IS_DTLS(s)) {
if (!CBS_get_u8_length_prefixed(&session_id, &cookie))
return -1;
}
/* Skip past cipher list */
if (!CBS_get_u16_length_prefixed(&session_id, &cipher_list))
return -1;
/* Skip past compression algorithm list */
if (!CBS_get_u8_length_prefixed(&session_id, &compress_algo))
return -1;
/* Now at start of extensions */
if (CBS_len(&session_id) == 0)
return 0;
if (!CBS_get_u16_length_prefixed(&session_id, &extensions))
return -1;
while (CBS_len(&extensions) > 0) {
CBS ext_data;
uint16_t ext_type;
if (!CBS_get_u16(&extensions, &ext_type) ||
!CBS_get_u16_length_prefixed(&extensions, &ext_data))
return -1;
if (ext_type == TLSEXT_TYPE_session_ticket) {
int r;
if (CBS_len(&ext_data) == 0) {
/* The client will accept a ticket but doesn't
* currently have one. */
s->internal->tlsext_ticket_expected = 1;
return 1;
}
if (s->internal->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, CBS_data(&ext_data),
CBS_len(&ext_data), session, session_len, ret);
switch (r) {
case 2: /* ticket couldn't be decrypted */
s->internal->tlsext_ticket_expected = 1;
return 2;
case 3: /* ticket was decrypted */
return r;
case 4: /* ticket decrypted but need to renew */
s->internal->tlsext_ticket_expected = 1;
return 3;
default: /* fatal error */
return -1;
}
}
}
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;
/*
* 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 (eticklen < 16 + EVP_MAX_IV_LENGTH)
return 2;
/* Initialize session ticket encryption and HMAC contexts */
HMAC_CTX_init(&hctx);
EVP_CIPHER_CTX_init(&ctx);
if (tctx->internal->tlsext_ticket_key_cb) {
unsigned char *nctick = (unsigned char *)etick;
int rv = tctx->internal->tlsext_ticket_key_cb(s,
nctick, nctick + 16, &ctx, &hctx, 0);
if (rv < 0) {
HMAC_CTX_cleanup(&hctx);
EVP_CIPHER_CTX_cleanup(&ctx);
return -1;
}
if (rv == 0) {
HMAC_CTX_cleanup(&hctx);
EVP_CIPHER_CTX_cleanup(&ctx);
return 2;
}
if (rv == 2)
renew_ticket = 1;
} else {
/* Check key name matches */
if (timingsafe_memcmp(etick,
tctx->internal->tlsext_tick_key_name, 16))
return 2;
HMAC_Init_ex(&hctx, tctx->internal->tlsext_tick_hmac_key,
16, tlsext_tick_md(), NULL);
EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
tctx->internal->tlsext_tick_aes_key, etick + 16);
}
/*
* Attempt to process session ticket, first conduct sanity and
* integrity checks on ticket.
*/
mlen = HMAC_size(&hctx);
if (mlen < 0) {
HMAC_CTX_cleanup(&hctx);
EVP_CIPHER_CTX_cleanup(&ctx);
return -1;
}
/* Sanity check ticket length: must exceed keyname + IV + HMAC */
if (eticklen <= 16 + EVP_CIPHER_CTX_iv_length(&ctx) + mlen) {
HMAC_CTX_cleanup(&hctx);
EVP_CIPHER_CTX_cleanup(&ctx);
return 2;
}
eticklen -= mlen;
/* Check HMAC of encrypted ticket */
if (HMAC_Update(&hctx, etick, eticklen) <= 0 ||
HMAC_Final(&hctx, tick_hmac, NULL) <= 0) {
HMAC_CTX_cleanup(&hctx);
EVP_CIPHER_CTX_cleanup(&ctx);
return -1;
}
HMAC_CTX_cleanup(&hctx);
if (timingsafe_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 = malloc(eticklen);
if (sdec == NULL ||
EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen) <= 0) {
free(sdec);
EVP_CIPHER_CTX_cleanup(&ctx);
return -1;
}
if (EVP_DecryptFinal_ex(&ctx, sdec + slen, &mlen) <= 0) {
free(sdec);
EVP_CIPHER_CTX_cleanup(&ctx);
return 2;
}
slen += mlen;
EVP_CIPHER_CTX_cleanup(&ctx);
p = sdec;
sess = d2i_SSL_SESSION(NULL, &p, slen);
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;
}
/* Tables to translate from NIDs to TLS v1.2 ids */
typedef struct {
int nid;
int id;
} tls12_lookup;
static tls12_lookup tls12_md[] = {
{NID_md5, TLSEXT_hash_md5},
{NID_sha1, TLSEXT_hash_sha1},
{NID_sha224, TLSEXT_hash_sha224},
{NID_sha256, TLSEXT_hash_sha256},
{NID_sha384, TLSEXT_hash_sha384},
{NID_sha512, TLSEXT_hash_sha512},
{NID_id_GostR3411_94, TLSEXT_hash_gost94},
{NID_id_tc26_gost3411_2012_256, TLSEXT_hash_streebog_256},
{NID_id_tc26_gost3411_2012_512, TLSEXT_hash_streebog_512}
};
static tls12_lookup tls12_sig[] = {
{EVP_PKEY_RSA, TLSEXT_signature_rsa},
{EVP_PKEY_EC, TLSEXT_signature_ecdsa},
{EVP_PKEY_GOSTR01, TLSEXT_signature_gostr01},
};
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;
}
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) {
case TLSEXT_hash_sha1:
return EVP_sha1();
case TLSEXT_hash_sha224:
return EVP_sha224();
case TLSEXT_hash_sha256:
return EVP_sha256();
case TLSEXT_hash_sha384:
return EVP_sha384();
case TLSEXT_hash_sha512:
return EVP_sha512();
#ifndef OPENSSL_NO_GOST
case TLSEXT_hash_gost94:
return EVP_gostr341194();
case TLSEXT_hash_streebog_256:
return EVP_streebog256();
case TLSEXT_hash_streebog_512:
return EVP_streebog512();
#endif
default:
return NULL;
}
}
/* Set preferred digest for each key type */
int
tls1_process_sigalgs(SSL *s, CBS *cbs)
{
const EVP_MD *md;
CERT *c = s->cert;
int idx;
/* Extension ignored for inappropriate versions */
if (!SSL_USE_SIGALGS(s))
return 1;
/* Should never happen */
if (c == NULL)
return 0;
c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL;
c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL;
c->pkeys[SSL_PKEY_ECC].digest = NULL;
c->pkeys[SSL_PKEY_GOST01].digest = NULL;
while (CBS_len(cbs) > 0) {
uint8_t hash_alg, sig_alg;
if (!CBS_get_u8(cbs, &hash_alg) || !CBS_get_u8(cbs, &sig_alg))
return 0;
switch (sig_alg) {
case TLSEXT_signature_rsa:
idx = SSL_PKEY_RSA_SIGN;
break;
case TLSEXT_signature_ecdsa:
idx = SSL_PKEY_ECC;
break;
case TLSEXT_signature_gostr01:
case TLSEXT_signature_gostr12_256:
case TLSEXT_signature_gostr12_512:
idx = SSL_PKEY_GOST01;
break;
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.
*/
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();
}
if (!c->pkeys[SSL_PKEY_ECC].digest)
c->pkeys[SSL_PKEY_ECC].digest = EVP_sha1();
#ifndef OPENSSL_NO_GOST
if (!c->pkeys[SSL_PKEY_GOST01].digest)
c->pkeys[SSL_PKEY_GOST01].digest = EVP_gostr341194();
#endif
return 1;
}
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