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ext-libressl-portable/ssl/ssl_srvr.c

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/* $OpenBSD: ssl_srvr.c,v 1.22 2017/08/12 21:47:59 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).
*
*/
/* ====================================================================
* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
*
* Portions of the attached software ("Contribution") are developed by
* SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
*
* The Contribution is licensed pursuant to the OpenSSL open source
* license provided above.
*
* ECC cipher suite support in OpenSSL originally written by
* Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
*
*/
/* ====================================================================
* Copyright 2005 Nokia. All rights reserved.
*
* The portions of the attached software ("Contribution") is developed by
* Nokia Corporation and is licensed pursuant to the OpenSSL open source
* license.
*
* The Contribution, originally written by Mika Kousa and Pasi Eronen of
* Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
* support (see RFC 4279) to OpenSSL.
*
* No patent licenses or other rights except those expressly stated in
* the OpenSSL open source license shall be deemed granted or received
* expressly, by implication, estoppel, or otherwise.
*
* No assurances are provided by Nokia that the Contribution does not
* infringe the patent or other intellectual property rights of any third
* party or that the license provides you with all the necessary rights
* to make use of the Contribution.
*
* THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
* ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
* SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
* OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
* OTHERWISE.
*/
#include <stdio.h>
#include "ssl_locl.h"
#include <openssl/bn.h>
#include <openssl/buffer.h>
#include <openssl/curve25519.h>
#include <openssl/evp.h>
#include <openssl/dh.h>
#ifndef OPENSSL_NO_GOST
#include <openssl/gost.h>
#endif
#include <openssl/hmac.h>
#include <openssl/md5.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include "bytestring.h"
int
ssl3_accept(SSL *s)
{
unsigned long alg_k;
void (*cb)(const SSL *ssl, int type, int val) = NULL;
int ret = -1;
int new_state, state, skip = 0;
ERR_clear_error();
errno = 0;
if (s->internal->info_callback != NULL)
cb = s->internal->info_callback;
else if (s->ctx->internal->info_callback != NULL)
cb = s->ctx->internal->info_callback;
/* init things to blank */
s->internal->in_handshake++;
if (!SSL_in_init(s) || SSL_in_before(s))
SSL_clear(s);
if (s->cert == NULL) {
SSLerror(s, SSL_R_NO_CERTIFICATE_SET);
ret = -1;
goto end;
}
for (;;) {
state = S3I(s)->hs.state;
switch (S3I(s)->hs.state) {
case SSL_ST_RENEGOTIATE:
s->internal->renegotiate = 1;
/* S3I(s)->hs.state=SSL_ST_ACCEPT; */
case SSL_ST_BEFORE:
case SSL_ST_ACCEPT:
case SSL_ST_BEFORE|SSL_ST_ACCEPT:
case SSL_ST_OK|SSL_ST_ACCEPT:
s->server = 1;
if (cb != NULL)
cb(s, SSL_CB_HANDSHAKE_START, 1);
if ((s->version >> 8) != 3) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
ret = -1;
goto end;
}
s->internal->type = SSL_ST_ACCEPT;
if (!ssl3_setup_init_buffer(s)) {
ret = -1;
goto end;
}
if (!ssl3_setup_buffers(s)) {
ret = -1;
goto end;
}
s->internal->init_num = 0;
if (S3I(s)->hs.state != SSL_ST_RENEGOTIATE) {
/*
* Ok, we now need to push on a buffering BIO
* so that the output is sent in a way that
* TCP likes :-)
*/
if (!ssl_init_wbio_buffer(s, 1)) {
ret = -1;
goto end;
}
if (!tls1_init_finished_mac(s)) {
ret = -1;
goto end;
}
S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_A;
s->ctx->internal->stats.sess_accept++;
} else if (!S3I(s)->send_connection_binding) {
/*
* Server attempting to renegotiate with
* client that doesn't support secure
* renegotiation.
*/
SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
ssl3_send_alert(s, SSL3_AL_FATAL,
SSL_AD_HANDSHAKE_FAILURE);
ret = -1;
goto end;
} else {
/*
* S3I(s)->hs.state == SSL_ST_RENEGOTIATE,
* we will just send a HelloRequest
*/
s->ctx->internal->stats.sess_accept_renegotiate++;
S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_A;
}
break;
case SSL3_ST_SW_HELLO_REQ_A:
case SSL3_ST_SW_HELLO_REQ_B:
s->internal->shutdown = 0;
ret = ssl3_send_hello_request(s);
if (ret <= 0)
goto end;
S3I(s)->hs.next_state = SSL3_ST_SW_HELLO_REQ_C;
S3I(s)->hs.state = SSL3_ST_SW_FLUSH;
s->internal->init_num = 0;
if (!tls1_init_finished_mac(s)) {
ret = -1;
goto end;
}
break;
case SSL3_ST_SW_HELLO_REQ_C:
S3I(s)->hs.state = SSL_ST_OK;
break;
case SSL3_ST_SR_CLNT_HELLO_A:
case SSL3_ST_SR_CLNT_HELLO_B:
case SSL3_ST_SR_CLNT_HELLO_C:
s->internal->shutdown = 0;
if (s->internal->rwstate != SSL_X509_LOOKUP) {
ret = ssl3_get_client_hello(s);
if (ret <= 0)
goto end;
}
s->internal->renegotiate = 2;
S3I(s)->hs.state = SSL3_ST_SW_SRVR_HELLO_A;
s->internal->init_num = 0;
break;
case SSL3_ST_SW_SRVR_HELLO_A:
case SSL3_ST_SW_SRVR_HELLO_B:
ret = ssl3_send_server_hello(s);
if (ret <= 0)
goto end;
if (s->internal->hit) {
if (s->internal->tlsext_ticket_expected)
S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A;
else
S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A;
}
else
S3I(s)->hs.state = SSL3_ST_SW_CERT_A;
s->internal->init_num = 0;
break;
case SSL3_ST_SW_CERT_A:
case SSL3_ST_SW_CERT_B:
/* Check if it is anon DH or anon ECDH. */
if (!(S3I(s)->hs.new_cipher->algorithm_auth &
SSL_aNULL)) {
ret = ssl3_send_server_certificate(s);
if (ret <= 0)
goto end;
if (s->internal->tlsext_status_expected)
S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_A;
else
S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A;
} else {
skip = 1;
S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A;
}
s->internal->init_num = 0;
break;
case SSL3_ST_SW_KEY_EXCH_A:
case SSL3_ST_SW_KEY_EXCH_B:
alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
/*
* Only send if using a DH key exchange.
*
* For ECC ciphersuites, we send a ServerKeyExchange
* message only if the cipher suite is ECDHE. In other
* cases, the server certificate contains the server's
* public key for key exchange.
*/
if (alg_k & (SSL_kDHE|SSL_kECDHE)) {
ret = ssl3_send_server_key_exchange(s);
if (ret <= 0)
goto end;
} else
skip = 1;
S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_A;
s->internal->init_num = 0;
break;
case SSL3_ST_SW_CERT_REQ_A:
case SSL3_ST_SW_CERT_REQ_B:
/*
* Determine whether or not we need to request a
* certificate.
*
* Do not request a certificate if:
*
* - We did not ask for it (SSL_VERIFY_PEER is unset).
*
* - SSL_VERIFY_CLIENT_ONCE is set and we are
* renegotiating.
*
* - We are using an anonymous ciphersuites
* (see section "Certificate request" in SSL 3 drafts
* and in RFC 2246) ... except when the application
* insists on verification (against the specs, but
* s3_clnt.c accepts this for SSL 3).
*/
if (!(s->verify_mode & SSL_VERIFY_PEER) ||
((s->session->peer != NULL) &&
(s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
((S3I(s)->hs.new_cipher->algorithm_auth &
SSL_aNULL) && !(s->verify_mode &
SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) {
/* No cert request */
skip = 1;
S3I(s)->tmp.cert_request = 0;
S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A;
if (S3I(s)->handshake_buffer) {
if (!tls1_digest_cached_records(s)) {
ret = -1;
goto end;
}
}
} else {
S3I(s)->tmp.cert_request = 1;
ret = ssl3_send_certificate_request(s);
if (ret <= 0)
goto end;
S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A;
s->internal->init_num = 0;
}
break;
case SSL3_ST_SW_SRVR_DONE_A:
case SSL3_ST_SW_SRVR_DONE_B:
ret = ssl3_send_server_done(s);
if (ret <= 0)
goto end;
S3I(s)->hs.next_state = SSL3_ST_SR_CERT_A;
S3I(s)->hs.state = SSL3_ST_SW_FLUSH;
s->internal->init_num = 0;
break;
case SSL3_ST_SW_FLUSH:
/*
* This code originally checked to see if
* any data was pending using BIO_CTRL_INFO
* and then flushed. This caused problems
* as documented in PR#1939. The proposed
* fix doesn't completely resolve this issue
* as buggy implementations of BIO_CTRL_PENDING
* still exist. So instead we just flush
* unconditionally.
*/
s->internal->rwstate = SSL_WRITING;
if (BIO_flush(s->wbio) <= 0) {
ret = -1;
goto end;
}
s->internal->rwstate = SSL_NOTHING;
S3I(s)->hs.state = S3I(s)->hs.next_state;
break;
case SSL3_ST_SR_CERT_A:
case SSL3_ST_SR_CERT_B:
if (S3I(s)->tmp.cert_request) {
ret = ssl3_get_client_certificate(s);
if (ret <= 0)
goto end;
}
s->internal->init_num = 0;
S3I(s)->hs.state = SSL3_ST_SR_KEY_EXCH_A;
break;
case SSL3_ST_SR_KEY_EXCH_A:
case SSL3_ST_SR_KEY_EXCH_B:
ret = ssl3_get_client_key_exchange(s);
if (ret <= 0)
goto end;
alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
if (ret == 2) {
/*
* For the ECDH ciphersuites when
* the client sends its ECDH pub key in
* a certificate, the CertificateVerify
* message is not sent.
* Also for GOST ciphersuites when
* the client uses its key from the certificate
* for key exchange.
*/
S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A;
s->internal->init_num = 0;
} else if (SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) {
S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A;
s->internal->init_num = 0;
if (!s->session->peer)
break;
/*
* For sigalgs freeze the handshake buffer
* at this point and digest cached records.
*/
if (!S3I(s)->handshake_buffer) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
ret = -1;
goto end;
}
s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
if (!tls1_digest_cached_records(s)) {
ret = -1;
goto end;
}
} else {
S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A;
s->internal->init_num = 0;
/*
* We need to get hashes here so if there is
* a client cert, it can be verified.
*/
if (S3I(s)->handshake_buffer) {
if (!tls1_digest_cached_records(s)) {
ret = -1;
goto end;
}
}
if (!tls1_handshake_hash_value(s,
S3I(s)->tmp.cert_verify_md,
sizeof(S3I(s)->tmp.cert_verify_md),
NULL)) {
ret = -1;
goto end;
}
}
break;
case SSL3_ST_SR_CERT_VRFY_A:
case SSL3_ST_SR_CERT_VRFY_B:
s->s3->flags |= SSL3_FLAGS_CCS_OK;
/* we should decide if we expected this one */
ret = ssl3_get_cert_verify(s);
if (ret <= 0)
goto end;
S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A;
s->internal->init_num = 0;
break;
case SSL3_ST_SR_FINISHED_A:
case SSL3_ST_SR_FINISHED_B:
s->s3->flags |= SSL3_FLAGS_CCS_OK;
ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
SSL3_ST_SR_FINISHED_B);
if (ret <= 0)
goto end;
if (s->internal->hit)
S3I(s)->hs.state = SSL_ST_OK;
else if (s->internal->tlsext_ticket_expected)
S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A;
else
S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A;
s->internal->init_num = 0;
break;
case SSL3_ST_SW_SESSION_TICKET_A:
case SSL3_ST_SW_SESSION_TICKET_B:
ret = ssl3_send_newsession_ticket(s);
if (ret <= 0)
goto end;
S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A;
s->internal->init_num = 0;
break;
case SSL3_ST_SW_CERT_STATUS_A:
case SSL3_ST_SW_CERT_STATUS_B:
ret = ssl3_send_cert_status(s);
if (ret <= 0)
goto end;
S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A;
s->internal->init_num = 0;
break;
case SSL3_ST_SW_CHANGE_A:
case SSL3_ST_SW_CHANGE_B:
s->session->cipher = S3I(s)->hs.new_cipher;
if (!tls1_setup_key_block(s)) {
ret = -1;
goto end;
}
ret = ssl3_send_change_cipher_spec(s,
SSL3_ST_SW_CHANGE_A, SSL3_ST_SW_CHANGE_B);
if (ret <= 0)
goto end;
S3I(s)->hs.state = SSL3_ST_SW_FINISHED_A;
s->internal->init_num = 0;
if (!tls1_change_cipher_state(
s, SSL3_CHANGE_CIPHER_SERVER_WRITE)) {
ret = -1;
goto end;
}
break;
case SSL3_ST_SW_FINISHED_A:
case SSL3_ST_SW_FINISHED_B:
ret = ssl3_send_finished(s,
SSL3_ST_SW_FINISHED_A, SSL3_ST_SW_FINISHED_B,
TLS_MD_SERVER_FINISH_CONST,
TLS_MD_SERVER_FINISH_CONST_SIZE);
if (ret <= 0)
goto end;
S3I(s)->hs.state = SSL3_ST_SW_FLUSH;
if (s->internal->hit)
S3I(s)->hs.next_state = SSL3_ST_SR_FINISHED_A;
else
S3I(s)->hs.next_state = SSL_ST_OK;
s->internal->init_num = 0;
break;
case SSL_ST_OK:
/* clean a few things up */
tls1_cleanup_key_block(s);
BUF_MEM_free(s->internal->init_buf);
s->internal->init_buf = NULL;
/* remove buffering on output */
ssl_free_wbio_buffer(s);
s->internal->init_num = 0;
/* skipped if we just sent a HelloRequest */
if (s->internal->renegotiate == 2) {
s->internal->renegotiate = 0;
s->internal->new_session = 0;
ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
s->ctx->internal->stats.sess_accept_good++;
/* s->server=1; */
s->internal->handshake_func = ssl3_accept;
if (cb != NULL)
cb(s, SSL_CB_HANDSHAKE_DONE, 1);
}
ret = 1;
goto end;
/* break; */
default:
SSLerror(s, SSL_R_UNKNOWN_STATE);
ret = -1;
goto end;
/* break; */
}
if (!S3I(s)->tmp.reuse_message && !skip) {
if (s->internal->debug) {
if ((ret = BIO_flush(s->wbio)) <= 0)
goto end;
}
if ((cb != NULL) && (S3I(s)->hs.state != state)) {
new_state = S3I(s)->hs.state;
S3I(s)->hs.state = state;
cb(s, SSL_CB_ACCEPT_LOOP, 1);
S3I(s)->hs.state = new_state;
}
}
skip = 0;
}
end:
/* BIO_flush(s->wbio); */
s->internal->in_handshake--;
if (cb != NULL)
cb(s, SSL_CB_ACCEPT_EXIT, ret);
return (ret);
}
int
ssl3_send_hello_request(SSL *s)
{
CBB cbb, hello;
memset(&cbb, 0, sizeof(cbb));
if (S3I(s)->hs.state == SSL3_ST_SW_HELLO_REQ_A) {
if (!ssl3_handshake_msg_start_cbb(s, &cbb, &hello,
SSL3_MT_HELLO_REQUEST))
goto err;
if (!ssl3_handshake_msg_finish_cbb(s, &cbb))
goto err;
S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_B;
}
/* SSL3_ST_SW_HELLO_REQ_B */
return (ssl3_handshake_write(s));
err:
CBB_cleanup(&cbb);
return (-1);
}
int
ssl3_get_client_hello(SSL *s)
{
CBS cbs, client_random, session_id, cookie, cipher_suites;
CBS compression_methods;
uint16_t client_version;
uint8_t comp_method;
int comp_null;
int i, j, ok, al, ret = -1, cookie_valid = 0;
long n;
unsigned long id;
unsigned char *p, *d;
SSL_CIPHER *c;
STACK_OF(SSL_CIPHER) *ciphers = NULL;
unsigned long alg_k;
const SSL_METHOD *method;
uint16_t shared_version;
unsigned char *end;
/*
* We do this so that we will respond with our native type.
* If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
* This down switching should be handled by a different method.
* If we are SSLv3, we will respond with SSLv3, even if prompted with
* TLSv1.
*/
if (S3I(s)->hs.state == SSL3_ST_SR_CLNT_HELLO_A) {
S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_B;
}
s->internal->first_packet = 1;
n = s->method->internal->ssl_get_message(s, SSL3_ST_SR_CLNT_HELLO_B,
SSL3_ST_SR_CLNT_HELLO_C, SSL3_MT_CLIENT_HELLO,
SSL3_RT_MAX_PLAIN_LENGTH, &ok);
if (!ok)
return ((int)n);
s->internal->first_packet = 0;
if (n < 0)
goto err;
d = p = (unsigned char *)s->internal->init_msg;
end = d + n;
CBS_init(&cbs, s->internal->init_msg, n);
/*
* Use version from inside client hello, not from record header.
* (may differ: see RFC 2246, Appendix E, second paragraph)
*/
if (!CBS_get_u16(&cbs, &client_version))
goto truncated;
if (ssl_max_shared_version(s, client_version, &shared_version) != 1) {
SSLerror(s, SSL_R_WRONG_VERSION_NUMBER);
if ((s->client_version >> 8) == SSL3_VERSION_MAJOR &&
!s->internal->enc_write_ctx && !s->internal->write_hash) {
/*
* Similar to ssl3_get_record, send alert using remote
* version number.
*/
s->version = s->client_version;
}
al = SSL_AD_PROTOCOL_VERSION;
goto f_err;
}
s->client_version = client_version;
s->version = shared_version;
if ((method = tls1_get_server_method(shared_version)) == NULL)
method = dtls1_get_server_method(shared_version);
if (method == NULL) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
goto err;
}
s->method = method;
if (!CBS_get_bytes(&cbs, &client_random, SSL3_RANDOM_SIZE))
goto truncated;
if (!CBS_get_u8_length_prefixed(&cbs, &session_id))
goto truncated;
/*
* If we require cookies (DTLS) and this ClientHello doesn't
* contain one, just return since we do not want to
* allocate any memory yet. So check cookie length...
*/
if (SSL_IS_DTLS(s)) {
if (!CBS_get_u8_length_prefixed(&cbs, &cookie))
goto truncated;
if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
if (CBS_len(&cookie) == 0)
return (1);
}
}
if (!CBS_write_bytes(&client_random, s->s3->client_random,
sizeof(s->s3->client_random), NULL))
goto err;
s->internal->hit = 0;
/*
* Versions before 0.9.7 always allow clients to resume sessions in
* renegotiation. 0.9.7 and later allow this by default, but optionally
* ignore resumption requests with flag
* SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag
* rather than a change to default behavior so that applications
* relying on this for security won't even compile against older
* library versions).
*
* 1.0.1 and later also have a function SSL_renegotiate_abbreviated()
* to request renegotiation but not a new session (s->internal->new_session
* remains unset): for servers, this essentially just means that the
* SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be
* ignored.
*/
if ((s->internal->new_session && (s->internal->options &
SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) {
if (!ssl_get_new_session(s, 1))
goto err;
} else {
/* XXX - pass CBS through instead... */
i = ssl_get_prev_session(s,
(unsigned char *)CBS_data(&session_id),
CBS_len(&session_id), end);
if (i == 1) { /* previous session */
s->internal->hit = 1;
} else if (i == -1)
goto err;
else {
/* i == 0 */
if (!ssl_get_new_session(s, 1))
goto err;
}
}
if (SSL_IS_DTLS(s)) {
/*
* The ClientHello may contain a cookie even if the HelloVerify
* message has not been sent - make sure that it does not cause
* an overflow.
*/
if (CBS_len(&cookie) > sizeof(D1I(s)->rcvd_cookie)) {
al = SSL_AD_DECODE_ERROR;
SSLerror(s, SSL_R_COOKIE_MISMATCH);
goto f_err;
}
/* Verify the cookie if appropriate option is set. */
if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
CBS_len(&cookie) > 0) {
size_t cookie_len;
/* XXX - rcvd_cookie seems to only be used here... */
if (!CBS_write_bytes(&cookie, D1I(s)->rcvd_cookie,
sizeof(D1I(s)->rcvd_cookie), &cookie_len))
goto err;
if (s->ctx->internal->app_verify_cookie_cb != NULL) {
if (s->ctx->internal->app_verify_cookie_cb(s,
D1I(s)->rcvd_cookie, cookie_len) == 0) {
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerror(s, SSL_R_COOKIE_MISMATCH);
goto f_err;
}
/* else cookie verification succeeded */
/* XXX - can d1->cookie_len > sizeof(rcvd_cookie) ? */
} else if (timingsafe_memcmp(D1I(s)->rcvd_cookie,
D1I(s)->cookie, D1I(s)->cookie_len) != 0) {
/* default verification */
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerror(s, SSL_R_COOKIE_MISMATCH);
goto f_err;
}
cookie_valid = 1;
}
}
if (!CBS_get_u16_length_prefixed(&cbs, &cipher_suites))
goto truncated;
/* XXX - This logic seems wrong... */
if (CBS_len(&cipher_suites) == 0 && CBS_len(&session_id) != 0) {
/* we need a cipher if we are not resuming a session */
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerror(s, SSL_R_NO_CIPHERS_SPECIFIED);
goto f_err;
}
if (CBS_len(&cipher_suites) > 0) {
if ((ciphers = ssl_bytes_to_cipher_list(s,
CBS_data(&cipher_suites), CBS_len(&cipher_suites))) == NULL)
goto err;
}
/* If it is a hit, check that the cipher is in the list */
if (s->internal->hit && CBS_len(&cipher_suites) > 0) {
j = 0;
id = s->session->cipher->id;
for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
c = sk_SSL_CIPHER_value(ciphers, i);
if (c->id == id) {
j = 1;
break;
}
}
if (j == 0) {
/*
* We need to have the cipher in the cipher
* list if we are asked to reuse it
*/
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerror(s, SSL_R_REQUIRED_CIPHER_MISSING);
goto f_err;
}
}
if (!CBS_get_u8_length_prefixed(&cbs, &compression_methods))
goto truncated;
comp_null = 0;
while (CBS_len(&compression_methods) > 0) {
if (!CBS_get_u8(&compression_methods, &comp_method))
goto truncated;
if (comp_method == 0)
comp_null = 1;
}
if (comp_null == 0) {
al = SSL_AD_DECODE_ERROR;
SSLerror(s, SSL_R_NO_COMPRESSION_SPECIFIED);
goto f_err;
}
p = (unsigned char *)CBS_data(&cbs);
/* TLS extensions*/
if (!ssl_parse_clienthello_tlsext(s, &p, d, n, &al)) {
/* 'al' set by ssl_parse_clienthello_tlsext */
SSLerror(s, SSL_R_PARSE_TLSEXT);
goto f_err;
}
if (ssl_check_clienthello_tlsext_early(s) <= 0) {
SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT);
goto err;
}
/*
* Check if we want to use external pre-shared secret for this
* handshake for not reused session only. We need to generate
* server_random before calling tls_session_secret_cb in order to allow
* SessionTicket processing to use it in key derivation.
*/
arc4random_buf(s->s3->server_random, SSL3_RANDOM_SIZE);
if (!s->internal->hit && s->internal->tls_session_secret_cb) {
SSL_CIPHER *pref_cipher = NULL;
s->session->master_key_length = sizeof(s->session->master_key);
if (s->internal->tls_session_secret_cb(s, s->session->master_key,
&s->session->master_key_length, ciphers, &pref_cipher,
s->internal->tls_session_secret_cb_arg)) {
s->internal->hit = 1;
s->session->ciphers = ciphers;
s->session->verify_result = X509_V_OK;
ciphers = NULL;
/* check if some cipher was preferred by call back */
pref_cipher = pref_cipher ? pref_cipher :
ssl3_choose_cipher(s, s->session->ciphers,
SSL_get_ciphers(s));
if (pref_cipher == NULL) {
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerror(s, SSL_R_NO_SHARED_CIPHER);
goto f_err;
}
s->session->cipher = pref_cipher;
sk_SSL_CIPHER_free(s->cipher_list);
sk_SSL_CIPHER_free(s->internal->cipher_list_by_id);
s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
s->internal->cipher_list_by_id =
sk_SSL_CIPHER_dup(s->session->ciphers);
}
}
/*
* Given s->session->ciphers and SSL_get_ciphers, we must
* pick a cipher
*/
if (!s->internal->hit) {
sk_SSL_CIPHER_free(s->session->ciphers);
s->session->ciphers = ciphers;
if (ciphers == NULL) {
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerror(s, SSL_R_NO_CIPHERS_PASSED);
goto f_err;
}
ciphers = NULL;
c = ssl3_choose_cipher(s, s->session->ciphers,
SSL_get_ciphers(s));
if (c == NULL) {
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerror(s, SSL_R_NO_SHARED_CIPHER);
goto f_err;
}
S3I(s)->hs.new_cipher = c;
} else {
S3I(s)->hs.new_cipher = s->session->cipher;
}
if (!tls1_handshake_hash_init(s))
goto err;
alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) ||
!(s->verify_mode & SSL_VERIFY_PEER)) {
if (!tls1_digest_cached_records(s)) {
al = SSL_AD_INTERNAL_ERROR;
goto f_err;
}
}
/*
* We now have the following setup.
* client_random
* cipher_list - our prefered list of ciphers
* ciphers - the clients prefered list of ciphers
* compression - basically ignored right now
* ssl version is set - sslv3
* s->session - The ssl session has been setup.
* s->internal->hit - session reuse flag
* s->hs.new_cipher - the new cipher to use.
*/
/* Handles TLS extensions that we couldn't check earlier */
if (ssl_check_clienthello_tlsext_late(s) <= 0) {
SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT);
goto err;
}
ret = cookie_valid ? 2 : 1;
if (0) {
truncated:
al = SSL_AD_DECODE_ERROR;
SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
f_err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
}
err:
sk_SSL_CIPHER_free(ciphers);
return (ret);
}
int
ssl3_send_server_hello(SSL *s)
{
unsigned char *bufend;
unsigned char *p, *d;
CBB cbb, session_id;
size_t outlen;
int sl;
memset(&cbb, 0, sizeof(cbb));
bufend = (unsigned char *)s->internal->init_buf->data + SSL3_RT_MAX_PLAIN_LENGTH;
if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) {
d = p = ssl3_handshake_msg_start(s, SSL3_MT_SERVER_HELLO);
if (!CBB_init_fixed(&cbb, p, bufend - p))
goto err;
if (!CBB_add_u16(&cbb, s->version))
goto err;
if (!CBB_add_bytes(&cbb, s->s3->server_random,
sizeof(s->s3->server_random)))
goto err;
/*
* There are several cases for the session ID to send
* back in the server hello:
*
* - For session reuse from the session cache,
* we send back the old session ID.
* - If stateless session reuse (using a session ticket)
* is successful, we send back the client's "session ID"
* (which doesn't actually identify the session).
* - If it is a new session, we send back the new
* session ID.
* - However, if we want the new session to be single-use,
* we send back a 0-length session ID.
*
* s->internal->hit is non-zero in either case of session reuse,
* so the following won't overwrite an ID that we're supposed
* to send back.
*/
if (!(s->ctx->internal->session_cache_mode & SSL_SESS_CACHE_SERVER)
&& !s->internal->hit)
s->session->session_id_length = 0;
sl = s->session->session_id_length;
if (sl > (int)sizeof(s->session->session_id)) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
goto err;
}
if (!CBB_add_u8_length_prefixed(&cbb, &session_id))
goto err;
if (!CBB_add_bytes(&session_id, s->session->session_id, sl))
goto err;
/* Cipher suite. */
if (!CBB_add_u16(&cbb,
ssl3_cipher_get_value(S3I(s)->hs.new_cipher)))
goto err;
/* Compression method. */
if (!CBB_add_u8(&cbb, 0))
goto err;
if (!CBB_finish(&cbb, NULL, &outlen))
goto err;
if ((p = ssl_add_serverhello_tlsext(s, p + outlen,
bufend)) == NULL) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
goto err;
}
ssl3_handshake_msg_finish(s, p - d);
}
/* SSL3_ST_SW_SRVR_HELLO_B */
return (ssl3_handshake_write(s));
err:
CBB_cleanup(&cbb);
return (-1);
}
int
ssl3_send_server_done(SSL *s)
{
CBB cbb, done;
memset(&cbb, 0, sizeof(cbb));
if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_DONE_A) {
if (!ssl3_handshake_msg_start_cbb(s, &cbb, &done,
SSL3_MT_SERVER_DONE))
goto err;
if (!ssl3_handshake_msg_finish_cbb(s, &cbb))
goto err;
S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_B;
}
/* SSL3_ST_SW_SRVR_DONE_B */
return (ssl3_handshake_write(s));
err:
CBB_cleanup(&cbb);
return (-1);
}
int
ssl3_send_server_kex_dhe(SSL *s, CBB *cbb)
{
CBB dh_p, dh_g, dh_Ys;
DH *dh = NULL, *dhp;
unsigned char *data;
int al;
if (s->cert->dh_tmp_auto != 0) {
if ((dhp = ssl_get_auto_dh(s)) == NULL) {
al = SSL_AD_INTERNAL_ERROR;
SSLerror(s, ERR_R_INTERNAL_ERROR);
goto f_err;
}
} else
dhp = s->cert->dh_tmp;
if (dhp == NULL && s->cert->dh_tmp_cb != NULL)
dhp = s->cert->dh_tmp_cb(s, 0,
SSL_C_PKEYLENGTH(S3I(s)->hs.new_cipher));
if (dhp == NULL) {
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerror(s, SSL_R_MISSING_TMP_DH_KEY);
goto f_err;
}
if (S3I(s)->tmp.dh != NULL) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
goto err;
}
if (s->cert->dh_tmp_auto != 0) {
dh = dhp;
} else if ((dh = DHparams_dup(dhp)) == NULL) {
SSLerror(s, ERR_R_DH_LIB);
goto err;
}
S3I(s)->tmp.dh = dh;
if (!DH_generate_key(dh)) {
SSLerror(s, ERR_R_DH_LIB);
goto err;
}
/*
* Serialize the DH parameters and public key.
*/
if (!CBB_add_u16_length_prefixed(cbb, &dh_p))
goto err;
if (!CBB_add_space(&dh_p, &data, BN_num_bytes(dh->p)))
goto err;
BN_bn2bin(dh->p, data);
if (!CBB_add_u16_length_prefixed(cbb, &dh_g))
goto err;
if (!CBB_add_space(&dh_g, &data, BN_num_bytes(dh->g)))
goto err;
BN_bn2bin(dh->g, data);
if (!CBB_add_u16_length_prefixed(cbb, &dh_Ys))
goto err;
if (!CBB_add_space(&dh_Ys, &data, BN_num_bytes(dh->pub_key)))
goto err;
BN_bn2bin(dh->pub_key, data);
if (!CBB_flush(cbb))
goto err;
return (1);
f_err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
err:
return (-1);
}
static int
ssl3_send_server_kex_ecdhe_ecp(SSL *s, int nid, CBB *cbb)
{
const EC_GROUP *group;
const EC_POINT *pubkey;
unsigned char *data;
int encoded_len = 0;
int curve_id = 0;
BN_CTX *bn_ctx = NULL;
EC_KEY *ecdh;
CBB ecpoint;
int al;
/*
* Only named curves are supported in ECDH ephemeral key exchanges.
* For supported named curves, curve_id is non-zero.
*/
if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) {
SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
goto err;
}
if (S3I(s)->tmp.ecdh != NULL) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
goto err;
}
if ((S3I(s)->tmp.ecdh = EC_KEY_new_by_curve_name(nid)) == NULL) {
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerror(s, SSL_R_MISSING_TMP_ECDH_KEY);
goto f_err;
}
ecdh = S3I(s)->tmp.ecdh;
if (!EC_KEY_generate_key(ecdh)) {
SSLerror(s, ERR_R_ECDH_LIB);
goto err;
}
if ((group = EC_KEY_get0_group(ecdh)) == NULL ||
(pubkey = EC_KEY_get0_public_key(ecdh)) == NULL ||
EC_KEY_get0_private_key(ecdh) == NULL) {
SSLerror(s, ERR_R_ECDH_LIB);
goto err;
}
/*
* Encode the public key.
*/
encoded_len = EC_POINT_point2oct(group, pubkey,
POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL);
if (encoded_len == 0) {
SSLerror(s, ERR_R_ECDH_LIB);
goto err;
}
if ((bn_ctx = BN_CTX_new()) == NULL) {
SSLerror(s, ERR_R_MALLOC_FAILURE);
goto err;
}
/*
* Only named curves are supported in ECDH ephemeral key exchanges.
* In this case the ServerKeyExchange message has:
* [1 byte CurveType], [2 byte CurveName]
* [1 byte length of encoded point], followed by
* the actual encoded point itself.
*/
if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE))
goto err;
if (!CBB_add_u16(cbb, curve_id))
goto err;
if (!CBB_add_u8_length_prefixed(cbb, &ecpoint))
goto err;
if (!CBB_add_space(&ecpoint, &data, encoded_len))
goto err;
if (EC_POINT_point2oct(group, pubkey, POINT_CONVERSION_UNCOMPRESSED,
data, encoded_len, bn_ctx) == 0) {
SSLerror(s, ERR_R_ECDH_LIB);
goto err;
}
if (!CBB_flush(cbb))
goto err;
BN_CTX_free(bn_ctx);
return (1);
f_err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
err:
BN_CTX_free(bn_ctx);
return (-1);
}
static int
ssl3_send_server_kex_ecdhe_ecx(SSL *s, int nid, CBB *cbb)
{
uint8_t *public_key = NULL;
int curve_id;
CBB ecpoint;
int ret = -1;
/* Generate an X25519 key pair. */
if (S3I(s)->tmp.x25519 != NULL) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
goto err;
}
if ((S3I(s)->tmp.x25519 = malloc(X25519_KEY_LENGTH)) == NULL)
goto err;
if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL)
goto err;
X25519_keypair(public_key, S3I(s)->tmp.x25519);
/* Serialize public key. */
if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) {
SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
goto err;
}
if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE))
goto err;
if (!CBB_add_u16(cbb, curve_id))
goto err;
if (!CBB_add_u8_length_prefixed(cbb, &ecpoint))
goto err;
if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH))
goto err;
if (!CBB_flush(cbb))
goto err;
ret = 1;
err:
free(public_key);
return (ret);
}
static int
ssl3_send_server_kex_ecdhe(SSL *s, CBB *cbb)
{
int nid;
nid = tls1_get_shared_curve(s);
if (nid == NID_X25519)
return ssl3_send_server_kex_ecdhe_ecx(s, nid, cbb);
return ssl3_send_server_kex_ecdhe_ecp(s, nid, cbb);
}
int
ssl3_send_server_key_exchange(SSL *s)
{
CBB cbb;
unsigned char *params = NULL;
size_t params_len;
unsigned char *q;
unsigned char md_buf[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
unsigned int u;
EVP_PKEY *pkey;
const EVP_MD *md = NULL;
unsigned char *p, *d;
int al, i, j, n, kn;
unsigned long type;
BUF_MEM *buf;
EVP_MD_CTX md_ctx;
memset(&cbb, 0, sizeof(cbb));
EVP_MD_CTX_init(&md_ctx);
if (S3I(s)->hs.state == SSL3_ST_SW_KEY_EXCH_A) {
type = S3I(s)->hs.new_cipher->algorithm_mkey;
buf = s->internal->init_buf;
if (!CBB_init(&cbb, 0))
goto err;
if (type & SSL_kDHE) {
if (ssl3_send_server_kex_dhe(s, &cbb) != 1)
goto err;
} else if (type & SSL_kECDHE) {
if (ssl3_send_server_kex_ecdhe(s, &cbb) != 1)
goto err;
} else {
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerror(s, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
goto f_err;
}
if (!CBB_finish(&cbb, &params, &params_len))
goto err;
if (!(S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL)) {
if ((pkey = ssl_get_sign_pkey(
s, S3I(s)->hs.new_cipher, &md)) == NULL) {
al = SSL_AD_DECODE_ERROR;
goto f_err;
}
kn = EVP_PKEY_size(pkey);
} else {
pkey = NULL;
kn = 0;
}
if (!BUF_MEM_grow_clean(buf, ssl3_handshake_msg_hdr_len(s) +
params_len + kn)) {
SSLerror(s, ERR_LIB_BUF);
goto err;
}
d = p = ssl3_handshake_msg_start(s,
SSL3_MT_SERVER_KEY_EXCHANGE);
memcpy(p, params, params_len);
free(params);
params = NULL;
n = params_len;
p += params_len;
/* not anonymous */
if (pkey != NULL) {
/*
* n is the length of the params, they start at &(d[4])
* and p points to the space at the end.
*/
if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) {
q = md_buf;
j = 0;
if (!EVP_DigestInit_ex(&md_ctx, EVP_md5_sha1(),
NULL))
goto err;
EVP_DigestUpdate(&md_ctx, s->s3->client_random,
SSL3_RANDOM_SIZE);
EVP_DigestUpdate(&md_ctx, s->s3->server_random,
SSL3_RANDOM_SIZE);
EVP_DigestUpdate(&md_ctx, d, n);
EVP_DigestFinal_ex(&md_ctx, q,
(unsigned int *)&i);
q += i;
j += i;
if (RSA_sign(NID_md5_sha1, md_buf, j,
&(p[2]), &u, pkey->pkey.rsa) <= 0) {
SSLerror(s, ERR_R_RSA_LIB);
goto err;
}
s2n(u, p);
n += u + 2;
} else if (md) {
/* Send signature algorithm. */
if (SSL_USE_SIGALGS(s)) {
if (!tls12_get_sigandhash(p, pkey, md)) {
/* Should never happen */
al = SSL_AD_INTERNAL_ERROR;
SSLerror(s, ERR_R_INTERNAL_ERROR);
goto f_err;
}
p += 2;
}
EVP_SignInit_ex(&md_ctx, md, NULL);
EVP_SignUpdate(&md_ctx,
s->s3->client_random,
SSL3_RANDOM_SIZE);
EVP_SignUpdate(&md_ctx,
s->s3->server_random,
SSL3_RANDOM_SIZE);
EVP_SignUpdate(&md_ctx, d, n);
if (!EVP_SignFinal(&md_ctx, &p[2],
(unsigned int *)&i, pkey)) {
SSLerror(s, ERR_R_EVP_LIB);
goto err;
}
s2n(i, p);
n += i + 2;
if (SSL_USE_SIGALGS(s))
n += 2;
} else {
/* Is this error check actually needed? */
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerror(s, SSL_R_UNKNOWN_PKEY_TYPE);
goto f_err;
}
}
ssl3_handshake_msg_finish(s, n);
}
S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_B;
EVP_MD_CTX_cleanup(&md_ctx);
return (ssl3_handshake_write(s));
f_err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
err:
free(params);
EVP_MD_CTX_cleanup(&md_ctx);
CBB_cleanup(&cbb);
return (-1);
}
int
ssl3_send_certificate_request(SSL *s)
{
CBB cbb, cert_request, cert_types, sigalgs, cert_auth, dn;
STACK_OF(X509_NAME) *sk = NULL;
X509_NAME *name;
int i;
/*
* Certificate Request - RFC 5246 section 7.4.4.
*/
memset(&cbb, 0, sizeof(cbb));
if (S3I(s)->hs.state == SSL3_ST_SW_CERT_REQ_A) {
if (!ssl3_handshake_msg_start_cbb(s, &cbb, &cert_request,
SSL3_MT_CERTIFICATE_REQUEST))
goto err;
if (!CBB_add_u8_length_prefixed(&cert_request, &cert_types))
goto err;
if (!ssl3_get_req_cert_types(s, &cert_types))
goto err;
if (SSL_USE_SIGALGS(s)) {
unsigned char *sigalgs_data;
size_t sigalgs_len;
tls12_get_req_sig_algs(s, &sigalgs_data, &sigalgs_len);
if (!CBB_add_u16_length_prefixed(&cert_request, &sigalgs))
goto err;
if (!CBB_add_bytes(&sigalgs, sigalgs_data, sigalgs_len))
goto err;
}
if (!CBB_add_u16_length_prefixed(&cert_request, &cert_auth))
goto err;
sk = SSL_get_client_CA_list(s);
for (i = 0; i < sk_X509_NAME_num(sk); i++) {
unsigned char *name_data;
size_t name_len;
name = sk_X509_NAME_value(sk, i);
name_len = i2d_X509_NAME(name, NULL);
if (!CBB_add_u16_length_prefixed(&cert_auth, &dn))
goto err;
if (!CBB_add_space(&dn, &name_data, name_len))
goto err;
if (i2d_X509_NAME(name, &name_data) != name_len)
goto err;
}
if (!ssl3_handshake_msg_finish_cbb(s, &cbb))
goto err;
S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_B;
}
/* SSL3_ST_SW_CERT_REQ_B */
return (ssl3_handshake_write(s));
err:
CBB_cleanup(&cbb);
return (-1);
}
static int
ssl3_get_client_kex_rsa(SSL *s, unsigned char *p, long n)
{
unsigned char fakekey[SSL_MAX_MASTER_KEY_LENGTH];
unsigned char *d;
RSA *rsa = NULL;
EVP_PKEY *pkey = NULL;
int i, al;
d = p;
arc4random_buf(fakekey, sizeof(fakekey));
fakekey[0] = s->client_version >> 8;
fakekey[1] = s->client_version & 0xff;
pkey = s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) ||
(pkey->pkey.rsa == NULL)) {
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerror(s, SSL_R_MISSING_RSA_CERTIFICATE);
goto f_err;
}
rsa = pkey->pkey.rsa;
if (2 > n)
goto truncated;
n2s(p, i);
if (n != i + 2) {
SSLerror(s, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
goto err;
} else
n = i;
i = RSA_private_decrypt((int)n, p, p, rsa, RSA_PKCS1_PADDING);
ERR_clear_error();
al = -1;
if (i != SSL_MAX_MASTER_KEY_LENGTH) {
al = SSL_AD_DECODE_ERROR;
/* SSLerror(s, SSL_R_BAD_RSA_DECRYPT); */
}
if (p - d + 2 > n) /* needed in the SSL3 case */
goto truncated;
if ((al == -1) && !((p[0] == (s->client_version >> 8)) &&
(p[1] == (s->client_version & 0xff)))) {
/*
* The premaster secret must contain the same version
* number as the ClientHello to detect version rollback
* attacks (strangely, the protocol does not offer such
* protection for DH ciphersuites).
* However, buggy clients exist that send the negotiated
* protocol version instead if the server does not
* support the requested protocol version.
* If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such
* clients.
*/
if (!((s->internal->options & SSL_OP_TLS_ROLLBACK_BUG) &&
(p[0] == (s->version >> 8)) &&
(p[1] == (s->version & 0xff)))) {
al = SSL_AD_DECODE_ERROR;
/* SSLerror(s, SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
/*
* The Klima-Pokorny-Rosa extension of
* Bleichenbacher's attack
* (http://eprint.iacr.org/2003/052/) exploits
* the version number check as a "bad version
* oracle" -- an alert would reveal that the
* plaintext corresponding to some ciphertext
* made up by the adversary is properly
* formatted except that the version number is
* wrong.
* To avoid such attacks, we should treat this
* just like any other decryption error.
*/
}
}
if (al != -1) {
/*
* Some decryption failure -- use random value instead
* as countermeasure against Bleichenbacher's attack
* on PKCS #1 v1.5 RSA padding (see RFC 2246,
* section 7.4.7.1).
*/
i = SSL_MAX_MASTER_KEY_LENGTH;
p = fakekey;
}
s->session->master_key_length =
tls1_generate_master_secret(s,
s->session->master_key, p, i);
explicit_bzero(p, i);
return (1);
truncated:
al = SSL_AD_DECODE_ERROR;
SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
f_err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
err:
return (-1);
}
static int
ssl3_get_client_kex_dhe(SSL *s, unsigned char *p, long n)
{
BIGNUM *bn = NULL;
int key_size, al;
CBS cbs, dh_Yc;
DH *dh;
if (n < 0)
goto err;
CBS_init(&cbs, p, n);
if (!CBS_get_u16_length_prefixed(&cbs, &dh_Yc))
goto truncated;
if (CBS_len(&cbs) != 0)
goto truncated;
if (S3I(s)->tmp.dh == NULL) {
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerror(s, SSL_R_MISSING_TMP_DH_KEY);
goto f_err;
}
dh = S3I(s)->tmp.dh;
if ((bn = BN_bin2bn(CBS_data(&dh_Yc), CBS_len(&dh_Yc), NULL)) == NULL) {
SSLerror(s, SSL_R_BN_LIB);
goto err;
}
key_size = DH_compute_key(p, bn, dh);
if (key_size <= 0) {
SSLerror(s, ERR_R_DH_LIB);
BN_clear_free(bn);
goto err;
}
s->session->master_key_length =
tls1_generate_master_secret(
s, s->session->master_key, p, key_size);
explicit_bzero(p, key_size);
DH_free(S3I(s)->tmp.dh);
S3I(s)->tmp.dh = NULL;
BN_clear_free(bn);
return (1);
truncated:
al = SSL_AD_DECODE_ERROR;
SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
f_err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
err:
return (-1);
}
static int
ssl3_get_client_kex_ecdhe_ecp(SSL *s, unsigned char *p, long n)
{
EC_KEY *srvr_ecdh = NULL;
EVP_PKEY *clnt_pub_pkey = NULL;
EC_POINT *clnt_ecpoint = NULL;
BN_CTX *bn_ctx = NULL;
int i, al;
int ret = 1;
int key_size;
const EC_KEY *tkey;
const EC_GROUP *group;
const BIGNUM *priv_key;
/* Initialize structures for server's ECDH key pair. */
if ((srvr_ecdh = EC_KEY_new()) == NULL) {
SSLerror(s, ERR_R_MALLOC_FAILURE);
goto err;
}
/*
* Use the ephemeral values we saved when
* generating the ServerKeyExchange message.
*/
tkey = S3I(s)->tmp.ecdh;
group = EC_KEY_get0_group(tkey);
priv_key = EC_KEY_get0_private_key(tkey);
if (!EC_KEY_set_group(srvr_ecdh, group) ||
!EC_KEY_set_private_key(srvr_ecdh, priv_key)) {
SSLerror(s, ERR_R_EC_LIB);
goto err;
}
/* Let's get client's public key */
if ((clnt_ecpoint = EC_POINT_new(group)) == NULL) {
SSLerror(s, ERR_R_MALLOC_FAILURE);
goto err;
}
if (n == 0L) {
/* Client Publickey was in Client Certificate */
if (((clnt_pub_pkey = X509_get_pubkey(
s->session->peer)) == NULL) ||
(clnt_pub_pkey->type != EVP_PKEY_EC)) {
/*
* XXX: For now, we do not support client
* authentication using ECDH certificates
* so this branch (n == 0L) of the code is
* never executed. When that support is
* added, we ought to ensure the key
* received in the certificate is
* authorized for key agreement.
* ECDH_compute_key implicitly checks that
* the two ECDH shares are for the same
* group.
*/
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerror(s, SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
goto f_err;
}
if (EC_POINT_copy(clnt_ecpoint,
EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec))
== 0) {
SSLerror(s, ERR_R_EC_LIB);
goto err;
}
ret = 2; /* Skip certificate verify processing */
} else {
/*
* Get client's public key from encoded point
* in the ClientKeyExchange message.
*/
if ((bn_ctx = BN_CTX_new()) == NULL) {
SSLerror(s, ERR_R_MALLOC_FAILURE);
goto err;
}
/* Get encoded point length */
i = *p;
p += 1;
if (n != 1 + i) {
SSLerror(s, ERR_R_EC_LIB);
goto err;
}
if (EC_POINT_oct2point(group,
clnt_ecpoint, p, i, bn_ctx) == 0) {
SSLerror(s, ERR_R_EC_LIB);
goto err;
}
/*
* p is pointing to somewhere in the buffer
* currently, so set it to the start.
*/
p = (unsigned char *)s->internal->init_buf->data;
}
/* Compute the shared pre-master secret */
key_size = ECDH_size(srvr_ecdh);
if (key_size <= 0) {
SSLerror(s, ERR_R_ECDH_LIB);
goto err;
}
i = ECDH_compute_key(p, key_size, clnt_ecpoint, srvr_ecdh,
NULL);
if (i <= 0) {
SSLerror(s, ERR_R_ECDH_LIB);
goto err;
}
EVP_PKEY_free(clnt_pub_pkey);
EC_POINT_free(clnt_ecpoint);
EC_KEY_free(srvr_ecdh);
BN_CTX_free(bn_ctx);
EC_KEY_free(S3I(s)->tmp.ecdh);
S3I(s)->tmp.ecdh = NULL;
/* Compute the master secret */
s->session->master_key_length =
tls1_generate_master_secret(
s, s->session->master_key, p, i);
explicit_bzero(p, i);
return (ret);
f_err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
err:
EVP_PKEY_free(clnt_pub_pkey);
EC_POINT_free(clnt_ecpoint);
EC_KEY_free(srvr_ecdh);
BN_CTX_free(bn_ctx);
return (-1);
}
static int
ssl3_get_client_kex_ecdhe_ecx(SSL *s, unsigned char *p, long n)
{
uint8_t *shared_key = NULL;
CBS cbs, ecpoint;
int ret = -1;
if (n < 0)
goto err;
CBS_init(&cbs, p, n);
if (!CBS_get_u8_length_prefixed(&cbs, &ecpoint))
goto err;
if (CBS_len(&ecpoint) != X25519_KEY_LENGTH)
goto err;
if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL)
goto err;
if (!X25519(shared_key, S3I(s)->tmp.x25519, CBS_data(&ecpoint)))
goto err;
freezero(S3I(s)->tmp.x25519, X25519_KEY_LENGTH);
S3I(s)->tmp.x25519 = NULL;
s->session->master_key_length =
tls1_generate_master_secret(
s, s->session->master_key, shared_key, X25519_KEY_LENGTH);
ret = 1;
err:
freezero(shared_key, X25519_KEY_LENGTH);
return (ret);
}
static int
ssl3_get_client_kex_ecdhe(SSL *s, unsigned char *p, long n)
{
if (S3I(s)->tmp.x25519 != NULL)
return ssl3_get_client_kex_ecdhe_ecx(s, p, n);
return ssl3_get_client_kex_ecdhe_ecp(s, p, n);
}
static int
ssl3_get_client_kex_gost(SSL *s, unsigned char *p, long n)
{
EVP_PKEY_CTX *pkey_ctx;
EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
unsigned char premaster_secret[32], *start;
size_t outlen = 32, inlen;
unsigned long alg_a;
int Ttag, Tclass;
long Tlen;
int al;
int ret = 0;
/* Get our certificate private key*/
alg_a = S3I(s)->hs.new_cipher->algorithm_auth;
if (alg_a & SSL_aGOST01)
pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
pkey_ctx = EVP_PKEY_CTX_new(pk, NULL);
EVP_PKEY_decrypt_init(pkey_ctx);
/*
* If client certificate is present and is of the same type,
* maybe use it for key exchange.
* Don't mind errors from EVP_PKEY_derive_set_peer, because
* it is completely valid to use a client certificate for
* authorization only.
*/
client_pub_pkey = X509_get_pubkey(s->session->peer);
if (client_pub_pkey) {
if (EVP_PKEY_derive_set_peer(pkey_ctx,
client_pub_pkey) <= 0)
ERR_clear_error();
}
if (2 > n)
goto truncated;
/* Decrypt session key */
if (ASN1_get_object((const unsigned char **)&p, &Tlen, &Ttag,
&Tclass, n) != V_ASN1_CONSTRUCTED ||
Ttag != V_ASN1_SEQUENCE || Tclass != V_ASN1_UNIVERSAL) {
SSLerror(s, SSL_R_DECRYPTION_FAILED);
goto gerr;
}
start = p;
inlen = Tlen;
if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen,
start, inlen) <=0) {
SSLerror(s, SSL_R_DECRYPTION_FAILED);
goto gerr;
}
/* Generate master secret */
s->session->master_key_length =
tls1_generate_master_secret(
s, s->session->master_key, premaster_secret, 32);
/* Check if pubkey from client certificate was used */
if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1,
EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
ret = 2;
else
ret = 1;
gerr:
EVP_PKEY_free(client_pub_pkey);
EVP_PKEY_CTX_free(pkey_ctx);
if (ret)
return (ret);
else
goto err;
truncated:
al = SSL_AD_DECODE_ERROR;
SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
ssl3_send_alert(s, SSL3_AL_FATAL, al);
err:
return (-1);
}
int
ssl3_get_client_key_exchange(SSL *s)
{
unsigned long alg_k;
unsigned char *p;
int al, ok;
long n;
/* 2048 maxlen is a guess. How long a key does that permit? */
n = s->method->internal->ssl_get_message(s, SSL3_ST_SR_KEY_EXCH_A,
SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048, &ok);
if (!ok)
return ((int)n);
p = (unsigned char *)s->internal->init_msg;
alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
if (alg_k & SSL_kRSA) {
if (ssl3_get_client_kex_rsa(s, p, n) != 1)
goto err;
} else if (alg_k & SSL_kDHE) {
if (ssl3_get_client_kex_dhe(s, p, n) != 1)
goto err;
} else if (alg_k & SSL_kECDHE) {
if (ssl3_get_client_kex_ecdhe(s, p, n) != 1)
goto err;
} else if (alg_k & SSL_kGOST) {
if (ssl3_get_client_kex_gost(s, p, n) != 1)
goto err;
} else {
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerror(s, SSL_R_UNKNOWN_CIPHER_TYPE);
goto f_err;
}
return (1);
f_err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
err:
return (-1);
}
int
ssl3_get_cert_verify(SSL *s)
{
EVP_PKEY *pkey = NULL;
unsigned char *p;
int al, ok, ret = 0;
long n;
int type = 0, i, j;
X509 *peer;
const EVP_MD *md = NULL;
EVP_MD_CTX mctx;
EVP_MD_CTX_init(&mctx);
n = s->method->internal->ssl_get_message(s, SSL3_ST_SR_CERT_VRFY_A,
SSL3_ST_SR_CERT_VRFY_B, -1, SSL3_RT_MAX_PLAIN_LENGTH, &ok);
if (!ok)
return ((int)n);
if (s->session->peer != NULL) {
peer = s->session->peer;
pkey = X509_get_pubkey(peer);
type = X509_certificate_type(peer, pkey);
} else {
peer = NULL;
pkey = NULL;
}
if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY) {
S3I(s)->tmp.reuse_message = 1;
if (peer != NULL) {
al = SSL_AD_UNEXPECTED_MESSAGE;
SSLerror(s, SSL_R_MISSING_VERIFY_MESSAGE);
goto f_err;
}
ret = 1;
goto end;
}
if (peer == NULL) {
SSLerror(s, SSL_R_NO_CLIENT_CERT_RECEIVED);
al = SSL_AD_UNEXPECTED_MESSAGE;
goto f_err;
}
if (!(type & EVP_PKT_SIGN)) {
SSLerror(s, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
al = SSL_AD_ILLEGAL_PARAMETER;
goto f_err;
}
if (S3I(s)->change_cipher_spec) {
SSLerror(s, SSL_R_CCS_RECEIVED_EARLY);
al = SSL_AD_UNEXPECTED_MESSAGE;
goto f_err;
}
/* we now have a signature that we need to verify */
p = (unsigned char *)s->internal->init_msg;
/*
* Check for broken implementations of GOST ciphersuites.
*
* If key is GOST and n is exactly 64, it is a bare
* signature without length field.
*/
if (n == 64 && (pkey->type == NID_id_GostR3410_94 ||
pkey->type == NID_id_GostR3410_2001) ) {
i = 64;
} else {
if (SSL_USE_SIGALGS(s)) {
int sigalg = tls12_get_sigid(pkey);
/* Should never happen */
if (sigalg == -1) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
al = SSL_AD_INTERNAL_ERROR;
goto f_err;
}
if (2 > n)
goto truncated;
/* Check key type is consistent with signature */
if (sigalg != (int)p[1]) {
SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE);
al = SSL_AD_DECODE_ERROR;
goto f_err;
}
md = tls12_get_hash(p[0]);
if (md == NULL) {
SSLerror(s, SSL_R_UNKNOWN_DIGEST);
al = SSL_AD_DECODE_ERROR;
goto f_err;
}
p += 2;
n -= 2;
}
if (2 > n)
goto truncated;
n2s(p, i);
n -= 2;
if (i > n)
goto truncated;
}
j = EVP_PKEY_size(pkey);
if ((i > j) || (n > j) || (n <= 0)) {
SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE);
al = SSL_AD_DECODE_ERROR;
goto f_err;
}
if (SSL_USE_SIGALGS(s)) {
long hdatalen = 0;
void *hdata;
hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer, &hdata);
if (hdatalen <= 0) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
al = SSL_AD_INTERNAL_ERROR;
goto f_err;
}
if (!EVP_VerifyInit_ex(&mctx, md, NULL) ||
!EVP_VerifyUpdate(&mctx, hdata, hdatalen)) {
SSLerror(s, ERR_R_EVP_LIB);
al = SSL_AD_INTERNAL_ERROR;
goto f_err;
}
if (EVP_VerifyFinal(&mctx, p, i, pkey) <= 0) {
al = SSL_AD_DECRYPT_ERROR;
SSLerror(s, SSL_R_BAD_SIGNATURE);
goto f_err;
}
} else
if (pkey->type == EVP_PKEY_RSA) {
i = RSA_verify(NID_md5_sha1, S3I(s)->tmp.cert_verify_md,
MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, p, i,
pkey->pkey.rsa);
if (i < 0) {
al = SSL_AD_DECRYPT_ERROR;
SSLerror(s, SSL_R_BAD_RSA_DECRYPT);
goto f_err;
}
if (i == 0) {
al = SSL_AD_DECRYPT_ERROR;
SSLerror(s, SSL_R_BAD_RSA_SIGNATURE);
goto f_err;
}
} else
if (pkey->type == EVP_PKEY_EC) {
j = ECDSA_verify(pkey->save_type,
&(S3I(s)->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
SHA_DIGEST_LENGTH, p, i, pkey->pkey.ec);
if (j <= 0) {
/* bad signature */
al = SSL_AD_DECRYPT_ERROR;
SSLerror(s, SSL_R_BAD_ECDSA_SIGNATURE);
goto f_err;
}
} else
#ifndef OPENSSL_NO_GOST
if (pkey->type == NID_id_GostR3410_94 ||
pkey->type == NID_id_GostR3410_2001) {
long hdatalen = 0;
void *hdata;
unsigned char signature[128];
unsigned int siglen = sizeof(signature);
int nid;
EVP_PKEY_CTX *pctx;
hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer, &hdata);
if (hdatalen <= 0) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
al = SSL_AD_INTERNAL_ERROR;
goto f_err;
}
if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) ||
!(md = EVP_get_digestbynid(nid))) {
SSLerror(s, ERR_R_EVP_LIB);
al = SSL_AD_INTERNAL_ERROR;
goto f_err;
}
pctx = EVP_PKEY_CTX_new(pkey, NULL);
if (!pctx) {
SSLerror(s, ERR_R_EVP_LIB);
al = SSL_AD_INTERNAL_ERROR;
goto f_err;
}
if (!EVP_DigestInit_ex(&mctx, md, NULL) ||
!EVP_DigestUpdate(&mctx, hdata, hdatalen) ||
!EVP_DigestFinal(&mctx, signature, &siglen) ||
(EVP_PKEY_verify_init(pctx) <= 0) ||
(EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) ||
(EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY,
EVP_PKEY_CTRL_GOST_SIG_FORMAT,
GOST_SIG_FORMAT_RS_LE,
NULL) <= 0)) {
SSLerror(s, ERR_R_EVP_LIB);
al = SSL_AD_INTERNAL_ERROR;
EVP_PKEY_CTX_free(pctx);
goto f_err;
}
if (EVP_PKEY_verify(pctx, p, i, signature, siglen) <= 0) {
al = SSL_AD_DECRYPT_ERROR;
SSLerror(s, SSL_R_BAD_SIGNATURE);
EVP_PKEY_CTX_free(pctx);
goto f_err;
}
EVP_PKEY_CTX_free(pctx);
} else
#endif
{
SSLerror(s, ERR_R_INTERNAL_ERROR);
al = SSL_AD_UNSUPPORTED_CERTIFICATE;
goto f_err;
}
ret = 1;
if (0) {
truncated:
al = SSL_AD_DECODE_ERROR;
SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
f_err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
}
end:
if (S3I(s)->handshake_buffer) {
BIO_free(S3I(s)->handshake_buffer);
S3I(s)->handshake_buffer = NULL;
s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
}
EVP_MD_CTX_cleanup(&mctx);
EVP_PKEY_free(pkey);
return (ret);
}
int
ssl3_get_client_certificate(SSL *s)
{
CBS cbs, client_certs;
int i, ok, al, ret = -1;
X509 *x = NULL;
long n;
const unsigned char *q;
STACK_OF(X509) *sk = NULL;
n = s->method->internal->ssl_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B,
-1, s->internal->max_cert_list, &ok);
if (!ok)
return ((int)n);
if (S3I(s)->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) {
if ((s->verify_mode & SSL_VERIFY_PEER) &&
(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
al = SSL_AD_HANDSHAKE_FAILURE;
goto f_err;
}
/*
* If tls asked for a client cert,
* the client must return a 0 list.
*/
if (S3I(s)->tmp.cert_request) {
SSLerror(s, SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST
);
al = SSL_AD_UNEXPECTED_MESSAGE;
goto f_err;
}
S3I(s)->tmp.reuse_message = 1;
return (1);
}
if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) {
al = SSL_AD_UNEXPECTED_MESSAGE;
SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE);
goto f_err;
}
if (n < 0)
goto truncated;
CBS_init(&cbs, s->internal->init_msg, n);
if ((sk = sk_X509_new_null()) == NULL) {
SSLerror(s, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!CBS_get_u24_length_prefixed(&cbs, &client_certs) ||
CBS_len(&cbs) != 0)
goto truncated;
while (CBS_len(&client_certs) > 0) {
CBS cert;
if (!CBS_get_u24_length_prefixed(&client_certs, &cert)) {
al = SSL_AD_DECODE_ERROR;
SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH);
goto f_err;
}
q = CBS_data(&cert);
x = d2i_X509(NULL, &q, CBS_len(&cert));
if (x == NULL) {
SSLerror(s, ERR_R_ASN1_LIB);
goto err;
}
if (q != CBS_data(&cert) + CBS_len(&cert)) {
al = SSL_AD_DECODE_ERROR;
SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH);
goto f_err;
}
if (!sk_X509_push(sk, x)) {
SSLerror(s, ERR_R_MALLOC_FAILURE);
goto err;
}
x = NULL;
}
if (sk_X509_num(sk) <= 0) {
/*
* TLS does not mind 0 certs returned.
* Fail for TLS only if we required a certificate.
*/
if ((s->verify_mode & SSL_VERIFY_PEER) &&
(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
al = SSL_AD_HANDSHAKE_FAILURE;
goto f_err;
}
/* No client certificate so digest cached records */
if (S3I(s)->handshake_buffer && !tls1_digest_cached_records(s)) {
al = SSL_AD_INTERNAL_ERROR;
goto f_err;
}
} else {
i = ssl_verify_cert_chain(s, sk);
if (i <= 0) {
al = ssl_verify_alarm_type(s->verify_result);
SSLerror(s, SSL_R_NO_CERTIFICATE_RETURNED);
goto f_err;
}
}
X509_free(s->session->peer);
s->session->peer = sk_X509_shift(sk);
s->session->verify_result = s->verify_result;
/*
* With the current implementation, sess_cert will always be NULL
* when we arrive here
*/
if (SSI(s)->sess_cert == NULL) {
SSI(s)->sess_cert = ssl_sess_cert_new();
if (SSI(s)->sess_cert == NULL) {
SSLerror(s, ERR_R_MALLOC_FAILURE);
goto err;
}
}
sk_X509_pop_free(SSI(s)->sess_cert->cert_chain, X509_free);
SSI(s)->sess_cert->cert_chain = sk;
/*
* Inconsistency alert: cert_chain does *not* include the
* peer's own certificate, while we do include it in s3_clnt.c
*/
sk = NULL;
ret = 1;
if (0) {
truncated:
al = SSL_AD_DECODE_ERROR;
SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
f_err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
}
err:
X509_free(x);
sk_X509_pop_free(sk, X509_free);
return (ret);
}
int
ssl3_send_server_certificate(SSL *s)
{
CBB cbb, server_cert;
X509 *x;
/*
* Server Certificate - RFC 5246, section 7.4.2.
*/
memset(&cbb, 0, sizeof(cbb));
if (S3I(s)->hs.state == SSL3_ST_SW_CERT_A) {
if ((x = ssl_get_server_send_cert(s)) == NULL) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
return (0);
}
if (!ssl3_handshake_msg_start_cbb(s, &cbb, &server_cert,
SSL3_MT_CERTIFICATE))
goto err;
if (!ssl3_output_cert_chain(s, &server_cert, x))
goto err;
if (!ssl3_handshake_msg_finish_cbb(s, &cbb))
goto err;
S3I(s)->hs.state = SSL3_ST_SW_CERT_B;
}
/* SSL3_ST_SW_CERT_B */
return (ssl3_handshake_write(s));
err:
CBB_cleanup(&cbb);
return (0);
}
/* send a new session ticket (not necessarily for a new session) */
int
ssl3_send_newsession_ticket(SSL *s)
{
unsigned char *d, *p, *macstart;
unsigned char *senc = NULL;
const unsigned char *const_p;
int len, slen_full, slen;
SSL_SESSION *sess;
unsigned int hlen;
EVP_CIPHER_CTX ctx;
HMAC_CTX hctx;
SSL_CTX *tctx = s->initial_ctx;
unsigned char iv[EVP_MAX_IV_LENGTH];
unsigned char key_name[16];
if (S3I(s)->hs.state == SSL3_ST_SW_SESSION_TICKET_A) {
/* get session encoding length */
slen_full = i2d_SSL_SESSION(s->session, NULL);
/*
* Some length values are 16 bits, so forget it if session is
* too long
*/
if (slen_full > 0xFF00)
goto err;
senc = malloc(slen_full);
if (!senc)
goto err;
p = senc;
i2d_SSL_SESSION(s->session, &p);
/*
* Create a fresh copy (not shared with other threads) to
* clean up
*/
const_p = senc;
sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
if (sess == NULL)
goto err;
/* ID is irrelevant for the ticket */
sess->session_id_length = 0;
slen = i2d_SSL_SESSION(sess, NULL);
if (slen > slen_full) {
/* shouldn't ever happen */
goto err;
}
p = senc;
i2d_SSL_SESSION(sess, &p);
SSL_SESSION_free(sess);
/*
* Grow buffer if need be: the length calculation is as
* follows 1 (size of message name) + 3 (message length
* bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
* 16 (key name) + max_iv_len (iv length) +
* session_length + max_enc_block_size (max encrypted session
* length) + max_md_size (HMAC).
*/
if (!BUF_MEM_grow(s->internal->init_buf, ssl3_handshake_msg_hdr_len(s) +
22 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
EVP_MAX_MD_SIZE + slen))
goto err;
d = p = ssl3_handshake_msg_start(s, SSL3_MT_NEWSESSION_TICKET);
EVP_CIPHER_CTX_init(&ctx);
HMAC_CTX_init(&hctx);
/*
* Initialize HMAC and cipher contexts. If callback present
* it does all the work otherwise use generated values
* from parent ctx.
*/
if (tctx->internal->tlsext_ticket_key_cb) {
if (tctx->internal->tlsext_ticket_key_cb(s,
key_name, iv, &ctx, &hctx, 1) < 0) {
EVP_CIPHER_CTX_cleanup(&ctx);
goto err;
}
} else {
arc4random_buf(iv, 16);
EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
tctx->internal->tlsext_tick_aes_key, iv);
HMAC_Init_ex(&hctx, tctx->internal->tlsext_tick_hmac_key,
16, tlsext_tick_md(), NULL);
memcpy(key_name, tctx->internal->tlsext_tick_key_name, 16);
}
/*
* Ticket lifetime hint (advisory only):
* We leave this unspecified for resumed session
* (for simplicity), and guess that tickets for new
* sessions will live as long as their sessions.
*/
l2n(s->internal->hit ? 0 : s->session->timeout, p);
/* Skip ticket length for now */
p += 2;
/* Output key name */
macstart = p;
memcpy(p, key_name, 16);
p += 16;
/* output IV */
memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
p += EVP_CIPHER_CTX_iv_length(&ctx);
/* Encrypt session data */
EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
p += len;
EVP_EncryptFinal_ex(&ctx, p, &len);
p += len;
EVP_CIPHER_CTX_cleanup(&ctx);
HMAC_Update(&hctx, macstart, p - macstart);
HMAC_Final(&hctx, p, &hlen);
HMAC_CTX_cleanup(&hctx);
p += hlen;
/* Now write out lengths: p points to end of data written */
/* Total length */
len = p - d;
/* Skip ticket lifetime hint. */
p = d + 4;
s2n(len - 6, p); /* Message length */
ssl3_handshake_msg_finish(s, len);
S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_B;
freezero(senc, slen_full);
}
/* SSL3_ST_SW_SESSION_TICKET_B */
return (ssl3_handshake_write(s));
err:
freezero(senc, slen_full);
return (-1);
}
int
ssl3_send_cert_status(SSL *s)
{
CBB cbb, certstatus, ocspresp;
memset(&cbb, 0, sizeof(cbb));
if (S3I(s)->hs.state == SSL3_ST_SW_CERT_STATUS_A) {
if (!ssl3_handshake_msg_start_cbb(s, &cbb, &certstatus,
SSL3_MT_CERTIFICATE_STATUS))
goto err;
if (!CBB_add_u8(&certstatus, s->tlsext_status_type))
goto err;
if (!CBB_add_u24_length_prefixed(&certstatus, &ocspresp))
goto err;
if (!CBB_add_bytes(&ocspresp, s->internal->tlsext_ocsp_resp,
s->internal->tlsext_ocsp_resplen))
goto err;
if (!ssl3_handshake_msg_finish_cbb(s, &cbb))
goto err;
S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_B;
}
/* SSL3_ST_SW_CERT_STATUS_B */
return (ssl3_handshake_write(s));
err:
CBB_cleanup(&cbb);
return (-1);
}
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