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openssl/ssl/statem/statem_clnt.c
Matt Caswell 4ff65f77b6 Add support for client side parsing of the PSK extension 
Requires a refactor of the ServerHello parsing, so that we parse first and
then subsequently process. This is because the resumption information is
held in the extensions block which is parsed last - but we need to know that
information earlier.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2259)
2017-01-30 10:18:20 +00:00

3363 lines
104 KiB
C
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/*
* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/* ====================================================================
* 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 <time.h>
#include "../ssl_locl.h"
#include "statem_locl.h"
#include <openssl/buffer.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/md5.h>
#include <openssl/dh.h>
#include <openssl/bn.h>
#include <openssl/engine.h>
static MSG_PROCESS_RETURN tls_process_encrypted_extensions(SSL *s, PACKET *pkt);
static ossl_inline int cert_req_allowed(SSL *s);
static int key_exchange_expected(SSL *s);
static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b);
static int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk,
WPACKET *pkt);
/*
* Is a CertificateRequest message allowed at the moment or not?
*
* Return values are:
* 1: Yes
* 0: No
*/
static ossl_inline int cert_req_allowed(SSL *s)
{
/* TLS does not like anon-DH with client cert */
if ((s->version > SSL3_VERSION
&& (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
|| (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aSRP | SSL_aPSK)))
return 0;
return 1;
}
/*
* Should we expect the ServerKeyExchange message or not?
*
* Return values are:
* 1: Yes
* 0: No
*/
static int key_exchange_expected(SSL *s)
{
long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
/*
* Can't skip server key exchange if this is an ephemeral
* ciphersuite or for SRP
*/
if (alg_k & (SSL_kDHE | SSL_kECDHE | SSL_kDHEPSK | SSL_kECDHEPSK
| SSL_kSRP)) {
return 1;
}
return 0;
}
/*
* ossl_statem_client_read_transition() encapsulates the logic for the allowed
* handshake state transitions when a TLS1.3 client is reading messages from the
* server. The message type that the server has sent is provided in |mt|. The
* current state is in |s->statem.hand_state|.
*
* Return values are 1 for success (transition allowed) and 0 on error
* (transition not allowed)
*/
static int ossl_statem_client13_read_transition(SSL *s, int mt)
{
OSSL_STATEM *st = &s->statem;
/*
* TODO(TLS1.3): This is still based on the TLSv1.2 state machine. Over time
* we will update this to look more like real TLSv1.3
*/
/*
* Note: There is no case for TLS_ST_CW_CLNT_HELLO, because we haven't
* yet negotiated TLSv1.3 at that point so that is handled by
* ossl_statem_client_read_transition()
*/
switch (st->hand_state) {
default:
break;
case TLS_ST_CR_SRVR_HELLO:
if (mt == SSL3_MT_ENCRYPTED_EXTENSIONS) {
st->hand_state = TLS_ST_CR_ENCRYPTED_EXTENSIONS;
return 1;
}
break;
case TLS_ST_CR_ENCRYPTED_EXTENSIONS:
if (s->hit) {
if (mt == SSL3_MT_FINISHED) {
st->hand_state = TLS_ST_CR_FINISHED;
return 1;
}
} else {
if (mt == SSL3_MT_CERTIFICATE_REQUEST) {
st->hand_state = TLS_ST_CR_CERT_REQ;
return 1;
}
if (mt == SSL3_MT_CERTIFICATE) {
st->hand_state = TLS_ST_CR_CERT;
return 1;
}
}
break;
case TLS_ST_CR_CERT_REQ:
if (mt == SSL3_MT_CERTIFICATE) {
st->hand_state = TLS_ST_CR_CERT;
return 1;
}
break;
case TLS_ST_CR_CERT:
if (mt == SSL3_MT_CERTIFICATE_VERIFY) {
st->hand_state = TLS_ST_CR_CERT_VRFY;
return 1;
}
break;
case TLS_ST_CR_CERT_VRFY:
if (mt == SSL3_MT_FINISHED) {
st->hand_state = TLS_ST_CR_FINISHED;
return 1;
}
break;
case TLS_ST_OK:
if (mt == SSL3_MT_NEWSESSION_TICKET) {
st->hand_state = TLS_ST_CR_SESSION_TICKET;
return 1;
}
break;
}
/* No valid transition found */
return 0;
}
/*
* ossl_statem_client_read_transition() encapsulates the logic for the allowed
* handshake state transitions when the client is reading messages from the
* server. The message type that the server has sent is provided in |mt|. The
* current state is in |s->statem.hand_state|.
*
* Return values are 1 for success (transition allowed) and 0 on error
* (transition not allowed)
*/
int ossl_statem_client_read_transition(SSL *s, int mt)
{
OSSL_STATEM *st = &s->statem;
int ske_expected;
/*
* Note that after a ClientHello we don't know what version we are going
* to negotiate yet, so we don't take this branch until later
*/
if (SSL_IS_TLS13(s)) {
if (!ossl_statem_client13_read_transition(s, mt))
goto err;
return 1;
}
switch (st->hand_state) {
default:
break;
case TLS_ST_CW_CLNT_HELLO:
if (mt == SSL3_MT_SERVER_HELLO) {
st->hand_state = TLS_ST_CR_SRVR_HELLO;
return 1;
}
if (SSL_IS_DTLS(s)) {
if (mt == DTLS1_MT_HELLO_VERIFY_REQUEST) {
st->hand_state = DTLS_ST_CR_HELLO_VERIFY_REQUEST;
return 1;
}
}
break;
case TLS_ST_CR_SRVR_HELLO:
if (s->hit) {
if (s->ext.ticket_expected) {
if (mt == SSL3_MT_NEWSESSION_TICKET) {
st->hand_state = TLS_ST_CR_SESSION_TICKET;
return 1;
}
} else if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
st->hand_state = TLS_ST_CR_CHANGE;
return 1;
}
} else {
if (SSL_IS_DTLS(s) && mt == DTLS1_MT_HELLO_VERIFY_REQUEST) {
st->hand_state = DTLS_ST_CR_HELLO_VERIFY_REQUEST;
return 1;
} else if (s->version >= TLS1_VERSION
&& s->ext.session_secret_cb != NULL
&& s->session->ext.tick != NULL
&& mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
/*
* Normally, we can tell if the server is resuming the session
* from the session ID. EAP-FAST (RFC 4851), however, relies on
* the next server message after the ServerHello to determine if
* the server is resuming.
*/
s->hit = 1;
st->hand_state = TLS_ST_CR_CHANGE;
return 1;
} else if (!(s->s3->tmp.new_cipher->algorithm_auth
& (SSL_aNULL | SSL_aSRP | SSL_aPSK))) {
if (mt == SSL3_MT_CERTIFICATE) {
st->hand_state = TLS_ST_CR_CERT;
return 1;
}
} else {
ske_expected = key_exchange_expected(s);
/* SKE is optional for some PSK ciphersuites */
if (ske_expected
|| ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)
&& mt == SSL3_MT_SERVER_KEY_EXCHANGE)) {
if (mt == SSL3_MT_SERVER_KEY_EXCHANGE) {
st->hand_state = TLS_ST_CR_KEY_EXCH;
return 1;
}
} else if (mt == SSL3_MT_CERTIFICATE_REQUEST
&& cert_req_allowed(s)) {
st->hand_state = TLS_ST_CR_CERT_REQ;
return 1;
} else if (mt == SSL3_MT_SERVER_DONE) {
st->hand_state = TLS_ST_CR_SRVR_DONE;
return 1;
}
}
}
break;
case TLS_ST_CR_CERT:
/*
* The CertificateStatus message is optional even if
* |ext.status_expected| is set
*/
if (s->ext.status_expected && mt == SSL3_MT_CERTIFICATE_STATUS) {
st->hand_state = TLS_ST_CR_CERT_STATUS;
return 1;
}
/* Fall through */
case TLS_ST_CR_CERT_STATUS:
ske_expected = key_exchange_expected(s);
/* SKE is optional for some PSK ciphersuites */
if (ske_expected || ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)
&& mt == SSL3_MT_SERVER_KEY_EXCHANGE)) {
if (mt == SSL3_MT_SERVER_KEY_EXCHANGE) {
st->hand_state = TLS_ST_CR_KEY_EXCH;
return 1;
}
goto err;
}
/* Fall through */
case TLS_ST_CR_KEY_EXCH:
if (mt == SSL3_MT_CERTIFICATE_REQUEST) {
if (cert_req_allowed(s)) {
st->hand_state = TLS_ST_CR_CERT_REQ;
return 1;
}
goto err;
}
/* Fall through */
case TLS_ST_CR_CERT_REQ:
if (mt == SSL3_MT_SERVER_DONE) {
st->hand_state = TLS_ST_CR_SRVR_DONE;
return 1;
}
break;
case TLS_ST_CW_FINISHED:
if (s->ext.ticket_expected) {
if (mt == SSL3_MT_NEWSESSION_TICKET) {
st->hand_state = TLS_ST_CR_SESSION_TICKET;
return 1;
}
} else if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
st->hand_state = TLS_ST_CR_CHANGE;
return 1;
}
break;
case TLS_ST_CR_SESSION_TICKET:
if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
st->hand_state = TLS_ST_CR_CHANGE;
return 1;
}
break;
case TLS_ST_CR_CHANGE:
if (mt == SSL3_MT_FINISHED) {
st->hand_state = TLS_ST_CR_FINISHED;
return 1;
}
break;
case TLS_ST_OK:
if (mt == SSL3_MT_HELLO_REQUEST) {
st->hand_state = TLS_ST_CR_HELLO_REQ;
return 1;
}
break;
}
err:
/* No valid transition found */
ssl3_send_alert(s, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE);
SSLerr(SSL_F_OSSL_STATEM_CLIENT_READ_TRANSITION, SSL_R_UNEXPECTED_MESSAGE);
return 0;
}
/*
* ossl_statem_client13_write_transition() works out what handshake state to
* move to next when the TLSv1.3 client is writing messages to be sent to the
* server.
*/
static WRITE_TRAN ossl_statem_client13_write_transition(SSL *s)
{
OSSL_STATEM *st = &s->statem;
/*
* TODO(TLS1.3): This is still based on the TLSv1.2 state machine. Over time
* we will update this to look more like real TLSv1.3
*/
/*
* Note: There are no cases for TLS_ST_BEFORE or TLS_ST_CW_CLNT_HELLO,
* because we haven't negotiated TLSv1.3 yet at that point. They are
* handled by ossl_statem_client_write_transition().
*/
switch (st->hand_state) {
default:
/* Shouldn't happen */
return WRITE_TRAN_ERROR;
case TLS_ST_CR_FINISHED:
st->hand_state = (s->s3->tmp.cert_req != 0) ? TLS_ST_CW_CERT
: TLS_ST_CW_FINISHED;
return WRITE_TRAN_CONTINUE;
case TLS_ST_CW_CERT:
/* If a non-empty Certificate we also send CertificateVerify */
st->hand_state = (s->s3->tmp.cert_req == 1) ? TLS_ST_CW_CERT_VRFY
: TLS_ST_CW_FINISHED;
return WRITE_TRAN_CONTINUE;
case TLS_ST_CW_CERT_VRFY:
st->hand_state = TLS_ST_CW_FINISHED;
return WRITE_TRAN_CONTINUE;
case TLS_ST_CR_SESSION_TICKET:
case TLS_ST_CW_FINISHED:
st->hand_state = TLS_ST_OK;
ossl_statem_set_in_init(s, 0);
return WRITE_TRAN_CONTINUE;
case TLS_ST_OK:
/* Just go straight to trying to read from the server */
return WRITE_TRAN_FINISHED;
}
}
/*
* ossl_statem_client_write_transition() works out what handshake state to
* move to next when the client is writing messages to be sent to the server.
*/
WRITE_TRAN ossl_statem_client_write_transition(SSL *s)
{
OSSL_STATEM *st = &s->statem;
/*
* Note that immediately before/after a ClientHello we don't know what
* version we are going to negotiate yet, so we don't take this branch until
* later
*/
if (SSL_IS_TLS13(s))
return ossl_statem_client13_write_transition(s);
switch (st->hand_state) {
default:
/* Shouldn't happen */
return WRITE_TRAN_ERROR;
case TLS_ST_OK:
if (!s->renegotiate) {
/*
* We haven't requested a renegotiation ourselves so we must have
* received a message from the server. Better read it.
*/
return WRITE_TRAN_FINISHED;
}
/* Renegotiation - fall through */
case TLS_ST_BEFORE:
st->hand_state = TLS_ST_CW_CLNT_HELLO;
return WRITE_TRAN_CONTINUE;
case TLS_ST_CW_CLNT_HELLO:
/*
* No transition at the end of writing because we don't know what
* we will be sent
*/
return WRITE_TRAN_FINISHED;
case DTLS_ST_CR_HELLO_VERIFY_REQUEST:
st->hand_state = TLS_ST_CW_CLNT_HELLO;
return WRITE_TRAN_CONTINUE;
case TLS_ST_CR_SRVR_DONE:
if (s->s3->tmp.cert_req)
st->hand_state = TLS_ST_CW_CERT;
else
st->hand_state = TLS_ST_CW_KEY_EXCH;
return WRITE_TRAN_CONTINUE;
case TLS_ST_CW_CERT:
st->hand_state = TLS_ST_CW_KEY_EXCH;
return WRITE_TRAN_CONTINUE;
case TLS_ST_CW_KEY_EXCH:
/*
* For TLS, cert_req is set to 2, so a cert chain of nothing is
* sent, but no verify packet is sent
*/
/*
* XXX: For now, we do not support client authentication in ECDH
* cipher suites with ECDH (rather than ECDSA) certificates. We
* need to skip the certificate verify message when client's
* ECDH public key is sent inside the client certificate.
*/
if (s->s3->tmp.cert_req == 1) {
st->hand_state = TLS_ST_CW_CERT_VRFY;
} else {
st->hand_state = TLS_ST_CW_CHANGE;
}
if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
st->hand_state = TLS_ST_CW_CHANGE;
}
return WRITE_TRAN_CONTINUE;
case TLS_ST_CW_CERT_VRFY:
st->hand_state = TLS_ST_CW_CHANGE;
return WRITE_TRAN_CONTINUE;
case TLS_ST_CW_CHANGE:
#if defined(OPENSSL_NO_NEXTPROTONEG)
st->hand_state = TLS_ST_CW_FINISHED;
#else
if (!SSL_IS_DTLS(s) && s->s3->npn_seen)
st->hand_state = TLS_ST_CW_NEXT_PROTO;
else
st->hand_state = TLS_ST_CW_FINISHED;
#endif
return WRITE_TRAN_CONTINUE;
#if !defined(OPENSSL_NO_NEXTPROTONEG)
case TLS_ST_CW_NEXT_PROTO:
st->hand_state = TLS_ST_CW_FINISHED;
return WRITE_TRAN_CONTINUE;
#endif
case TLS_ST_CW_FINISHED:
if (s->hit) {
st->hand_state = TLS_ST_OK;
ossl_statem_set_in_init(s, 0);
return WRITE_TRAN_CONTINUE;
} else {
return WRITE_TRAN_FINISHED;
}
case TLS_ST_CR_FINISHED:
if (s->hit) {
st->hand_state = TLS_ST_CW_CHANGE;
return WRITE_TRAN_CONTINUE;
} else {
st->hand_state = TLS_ST_OK;
ossl_statem_set_in_init(s, 0);
return WRITE_TRAN_CONTINUE;
}
case TLS_ST_CR_HELLO_REQ:
/*
* If we can renegotiate now then do so, otherwise wait for a more
* convenient time.
*/
if (ssl3_renegotiate_check(s, 1)) {
if (!tls_setup_handshake(s)) {
ossl_statem_set_error(s);
return WRITE_TRAN_ERROR;
}
st->hand_state = TLS_ST_CW_CLNT_HELLO;
return WRITE_TRAN_CONTINUE;
}
st->hand_state = TLS_ST_OK;
ossl_statem_set_in_init(s, 0);
return WRITE_TRAN_CONTINUE;
}
}
/*
* Perform any pre work that needs to be done prior to sending a message from
* the client to the server.
*/
WORK_STATE ossl_statem_client_pre_work(SSL *s, WORK_STATE wst)
{
OSSL_STATEM *st = &s->statem;
switch (st->hand_state) {
default:
/* No pre work to be done */
break;
case TLS_ST_CW_CLNT_HELLO:
s->shutdown = 0;
if (SSL_IS_DTLS(s)) {
/* every DTLS ClientHello resets Finished MAC */
if (!ssl3_init_finished_mac(s)) {
ossl_statem_set_error(s);
return WORK_ERROR;
}
}
break;
case TLS_ST_CW_CHANGE:
if (SSL_IS_DTLS(s)) {
if (s->hit) {
/*
* We're into the last flight so we don't retransmit these
* messages unless we need to.
*/
st->use_timer = 0;
}
#ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
return dtls_wait_for_dry(s);
#endif
}
break;
case TLS_ST_OK:
return tls_finish_handshake(s, wst, 1);
}
return WORK_FINISHED_CONTINUE;
}
/*
* Perform any work that needs to be done after sending a message from the
* client to the server.
case TLS_ST_SR_CERT_VRFY:
return SSL3_RT_MAX_PLAIN_LENGTH;
*/
WORK_STATE ossl_statem_client_post_work(SSL *s, WORK_STATE wst)
{
OSSL_STATEM *st = &s->statem;
s->init_num = 0;
switch (st->hand_state) {
default:
/* No post work to be done */
break;
case TLS_ST_CW_CLNT_HELLO:
if (wst == WORK_MORE_A && statem_flush(s) != 1)
return WORK_MORE_A;
if (SSL_IS_DTLS(s)) {
/* Treat the next message as the first packet */
s->first_packet = 1;
}
break;
case TLS_ST_CW_KEY_EXCH:
if (tls_client_key_exchange_post_work(s) == 0)
return WORK_ERROR;
break;
case TLS_ST_CW_CHANGE:
s->session->cipher = s->s3->tmp.new_cipher;
#ifdef OPENSSL_NO_COMP
s->session->compress_meth = 0;
#else
if (s->s3->tmp.new_compression == NULL)
s->session->compress_meth = 0;
else
s->session->compress_meth = s->s3->tmp.new_compression->id;
#endif
if (!s->method->ssl3_enc->setup_key_block(s))
return WORK_ERROR;
if (!s->method->ssl3_enc->change_cipher_state(s,
SSL3_CHANGE_CIPHER_CLIENT_WRITE))
return WORK_ERROR;
if (SSL_IS_DTLS(s)) {
#ifndef OPENSSL_NO_SCTP
if (s->hit) {
/*
* Change to new shared key of SCTP-Auth, will be ignored if
* no SCTP used.
*/
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
0, NULL);
}
#endif
dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
}
break;
case TLS_ST_CW_FINISHED:
#ifndef OPENSSL_NO_SCTP
if (wst == WORK_MORE_A && SSL_IS_DTLS(s) && s->hit == 0) {
/*
* Change to new shared key of SCTP-Auth, will be ignored if
* no SCTP used.
*/
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
0, NULL);
}
#endif
if (statem_flush(s) != 1)
return WORK_MORE_B;
if (SSL_IS_TLS13(s)) {
if (!s->method->ssl3_enc->change_cipher_state(s,
SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_CLIENT_WRITE))
return WORK_ERROR;
}
break;
}
return WORK_FINISHED_CONTINUE;
}
/*
* Get the message construction function and message type for sending from the
* client
*
* Valid return values are:
* 1: Success
* 0: Error
*/
int ossl_statem_client_construct_message(SSL *s, WPACKET *pkt,
confunc_f *confunc, int *mt)
{
OSSL_STATEM *st = &s->statem;
switch (st->hand_state) {
default:
/* Shouldn't happen */
return 0;
case TLS_ST_CW_CHANGE:
if (SSL_IS_DTLS(s))
*confunc = dtls_construct_change_cipher_spec;
else
*confunc = tls_construct_change_cipher_spec;
*mt = SSL3_MT_CHANGE_CIPHER_SPEC;
break;
case TLS_ST_CW_CLNT_HELLO:
*confunc = tls_construct_client_hello;
*mt = SSL3_MT_CLIENT_HELLO;
break;
case TLS_ST_CW_CERT:
*confunc = tls_construct_client_certificate;
*mt = SSL3_MT_CERTIFICATE;
break;
case TLS_ST_CW_KEY_EXCH:
*confunc = tls_construct_client_key_exchange;
*mt = SSL3_MT_CLIENT_KEY_EXCHANGE;
break;
case TLS_ST_CW_CERT_VRFY:
*confunc = tls_construct_cert_verify;
*mt = SSL3_MT_CERTIFICATE_VERIFY;
break;
#if !defined(OPENSSL_NO_NEXTPROTONEG)
case TLS_ST_CW_NEXT_PROTO:
*confunc = tls_construct_next_proto;
*mt = SSL3_MT_NEXT_PROTO;
break;
#endif
case TLS_ST_CW_FINISHED:
*confunc = tls_construct_finished;
*mt = SSL3_MT_FINISHED;
break;
}
return 1;
}
/*
* Returns the maximum allowed length for the current message that we are
* reading. Excludes the message header.
*/
size_t ossl_statem_client_max_message_size(SSL *s)
{
OSSL_STATEM *st = &s->statem;
switch (st->hand_state) {
default:
/* Shouldn't happen */
return 0;
case TLS_ST_CR_SRVR_HELLO:
return SERVER_HELLO_MAX_LENGTH;
case DTLS_ST_CR_HELLO_VERIFY_REQUEST:
return HELLO_VERIFY_REQUEST_MAX_LENGTH;
case TLS_ST_CR_CERT:
return s->max_cert_list;
case TLS_ST_CR_CERT_VRFY:
return SSL3_RT_MAX_PLAIN_LENGTH;
case TLS_ST_CR_CERT_STATUS:
return SSL3_RT_MAX_PLAIN_LENGTH;
case TLS_ST_CR_KEY_EXCH:
return SERVER_KEY_EXCH_MAX_LENGTH;
case TLS_ST_CR_CERT_REQ:
/*
* Set to s->max_cert_list for compatibility with previous releases. In
* practice these messages can get quite long if servers are configured
* to provide a long list of acceptable CAs
*/
return s->max_cert_list;
case TLS_ST_CR_SRVR_DONE:
return SERVER_HELLO_DONE_MAX_LENGTH;
case TLS_ST_CR_CHANGE:
if (s->version == DTLS1_BAD_VER)
return 3;
return CCS_MAX_LENGTH;
case TLS_ST_CR_SESSION_TICKET:
return SSL3_RT_MAX_PLAIN_LENGTH;
case TLS_ST_CR_FINISHED:
return FINISHED_MAX_LENGTH;
case TLS_ST_CR_ENCRYPTED_EXTENSIONS:
return ENCRYPTED_EXTENSIONS_MAX_LENGTH;
}
}
/*
* Process a message that the client has been received from the server.
*/
MSG_PROCESS_RETURN ossl_statem_client_process_message(SSL *s, PACKET *pkt)
{
OSSL_STATEM *st = &s->statem;
switch (st->hand_state) {
default:
/* Shouldn't happen */
return MSG_PROCESS_ERROR;
case TLS_ST_CR_SRVR_HELLO:
return tls_process_server_hello(s, pkt);
case DTLS_ST_CR_HELLO_VERIFY_REQUEST:
return dtls_process_hello_verify(s, pkt);
case TLS_ST_CR_CERT:
return tls_process_server_certificate(s, pkt);
case TLS_ST_CR_CERT_VRFY:
return tls_process_cert_verify(s, pkt);
case TLS_ST_CR_CERT_STATUS:
return tls_process_cert_status(s, pkt);
case TLS_ST_CR_KEY_EXCH:
return tls_process_key_exchange(s, pkt);
case TLS_ST_CR_CERT_REQ:
return tls_process_certificate_request(s, pkt);
case TLS_ST_CR_SRVR_DONE:
return tls_process_server_done(s, pkt);
case TLS_ST_CR_CHANGE:
return tls_process_change_cipher_spec(s, pkt);
case TLS_ST_CR_SESSION_TICKET:
return tls_process_new_session_ticket(s, pkt);
case TLS_ST_CR_FINISHED:
return tls_process_finished(s, pkt);
case TLS_ST_CR_HELLO_REQ:
return tls_process_hello_req(s, pkt);
case TLS_ST_CR_ENCRYPTED_EXTENSIONS:
return tls_process_encrypted_extensions(s, pkt);
}
}
/*
* Perform any further processing required following the receipt of a message
* from the server
*/
WORK_STATE ossl_statem_client_post_process_message(SSL *s, WORK_STATE wst)
{
OSSL_STATEM *st = &s->statem;
switch (st->hand_state) {
default:
/* Shouldn't happen */
return WORK_ERROR;
case TLS_ST_CR_CERT_REQ:
return tls_prepare_client_certificate(s, wst);
#ifndef OPENSSL_NO_SCTP
case TLS_ST_CR_SRVR_DONE:
/* We only get here if we are using SCTP and we are renegotiating */
if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
s->s3->in_read_app_data = 2;
s->rwstate = SSL_READING;
BIO_clear_retry_flags(SSL_get_rbio(s));
BIO_set_retry_read(SSL_get_rbio(s));
ossl_statem_set_sctp_read_sock(s, 1);
return WORK_MORE_A;
}
ossl_statem_set_sctp_read_sock(s, 0);
return WORK_FINISHED_STOP;
#endif
}
}
int tls_construct_client_hello(SSL *s, WPACKET *pkt)
{
unsigned char *p;
size_t sess_id_len;
int i, protverr;
int al = SSL_AD_HANDSHAKE_FAILURE;
#ifndef OPENSSL_NO_COMP
SSL_COMP *comp;
#endif
SSL_SESSION *sess = s->session;
if (!WPACKET_set_max_size(pkt, SSL3_RT_MAX_PLAIN_LENGTH)) {
/* Should not happen */
SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
return 0;
}
/* Work out what SSL/TLS/DTLS version to use */
protverr = ssl_set_client_hello_version(s);
if (protverr != 0) {
SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, protverr);
return 0;
}
if ((sess == NULL) || !ssl_version_supported(s, sess->ssl_version) ||
/*
* In the case of EAP-FAST, we can have a pre-shared
* "ticket" without a session ID.
*/
(!sess->session_id_length && !sess->ext.tick) ||
(sess->not_resumable)) {
if (!ssl_get_new_session(s, 0))
return 0;
}
/* else use the pre-loaded session */
/* This is a real handshake so make sure we clean it up at the end */
s->statem.cleanuphand = 1;
p = s->s3->client_random;
/*
* for DTLS if client_random is initialized, reuse it, we are
* required to use same upon reply to HelloVerify
*/
if (SSL_IS_DTLS(s)) {
size_t idx;
i = 1;
for (idx = 0; idx < sizeof(s->s3->client_random); idx++) {
if (p[idx]) {
i = 0;
break;
}
}
} else
i = 1;
if (i && ssl_fill_hello_random(s, 0, p, sizeof(s->s3->client_random)) <= 0)
return 0;
/*-
* version indicates the negotiated version: for example from
* an SSLv2/v3 compatible client hello). The client_version
* field is the maximum version we permit and it is also
* used in RSA encrypted premaster secrets. Some servers can
* choke if we initially report a higher version then
* renegotiate to a lower one in the premaster secret. This
* didn't happen with TLS 1.0 as most servers supported it
* but it can with TLS 1.1 or later if the server only supports
* 1.0.
*
* Possible scenario with previous logic:
* 1. Client hello indicates TLS 1.2
* 2. Server hello says TLS 1.0
* 3. RSA encrypted premaster secret uses 1.2.
* 4. Handshake proceeds using TLS 1.0.
* 5. Server sends hello request to renegotiate.
* 6. Client hello indicates TLS v1.0 as we now
* know that is maximum server supports.
* 7. Server chokes on RSA encrypted premaster secret
* containing version 1.0.
*
* For interoperability it should be OK to always use the
* maximum version we support in client hello and then rely
* on the checking of version to ensure the servers isn't
* being inconsistent: for example initially negotiating with
* TLS 1.0 and renegotiating with TLS 1.2. We do this by using
* client_version in client hello and not resetting it to
* the negotiated version.
*
* For TLS 1.3 we always set the ClientHello version to 1.2 and rely on the
* supported_versions extension for the real supported versions.
*/
if (!WPACKET_put_bytes_u16(pkt, s->client_version)
|| !WPACKET_memcpy(pkt, s->s3->client_random, SSL3_RANDOM_SIZE)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
return 0;
}
/* Session ID */
if (s->new_session || s->session->ssl_version == TLS1_3_VERSION)
sess_id_len = 0;
else
sess_id_len = s->session->session_id_length;
if (sess_id_len > sizeof(s->session->session_id)
|| !WPACKET_start_sub_packet_u8(pkt)
|| (sess_id_len != 0 && !WPACKET_memcpy(pkt, s->session->session_id,
sess_id_len))
|| !WPACKET_close(pkt)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
return 0;
}
/* cookie stuff for DTLS */
if (SSL_IS_DTLS(s)) {
if (s->d1->cookie_len > sizeof(s->d1->cookie)
|| !WPACKET_sub_memcpy_u8(pkt, s->d1->cookie,
s->d1->cookie_len)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
return 0;
}
}
/* Ciphers supported */
if (!WPACKET_start_sub_packet_u16(pkt)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
return 0;
}
/* ssl_cipher_list_to_bytes() raises SSLerr if appropriate */
if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), pkt))
return 0;
if (!WPACKET_close(pkt)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
return 0;
}
/* COMPRESSION */
if (!WPACKET_start_sub_packet_u8(pkt)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
return 0;
}
#ifndef OPENSSL_NO_COMP
if (ssl_allow_compression(s) && s->ctx->comp_methods) {
int compnum = sk_SSL_COMP_num(s->ctx->comp_methods);
for (i = 0; i < compnum; i++) {
comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
if (!WPACKET_put_bytes_u8(pkt, comp->id)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
return 0;
}
}
}
#endif
/* Add the NULL method */
if (!WPACKET_put_bytes_u8(pkt, 0) || !WPACKET_close(pkt)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
return 0;
}
/* TLS extensions */
if (!tls_construct_extensions(s, pkt, EXT_CLIENT_HELLO, NULL, 0, &al)) {
ssl3_send_alert(s, SSL3_AL_FATAL, al);
SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
return 0;
}
return 1;
}
MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, PACKET *pkt)
{
int al;
size_t cookie_len;
PACKET cookiepkt;
if (!PACKET_forward(pkt, 2)
|| !PACKET_get_length_prefixed_1(pkt, &cookiepkt)) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_DTLS_PROCESS_HELLO_VERIFY, SSL_R_LENGTH_MISMATCH);
goto f_err;
}
cookie_len = PACKET_remaining(&cookiepkt);
if (cookie_len > sizeof(s->d1->cookie)) {
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_DTLS_PROCESS_HELLO_VERIFY, SSL_R_LENGTH_TOO_LONG);
goto f_err;
}
if (!PACKET_copy_bytes(&cookiepkt, s->d1->cookie, cookie_len)) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_DTLS_PROCESS_HELLO_VERIFY, SSL_R_LENGTH_MISMATCH);
goto f_err;
}
s->d1->cookie_len = cookie_len;
return MSG_PROCESS_FINISHED_READING;
f_err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
ossl_statem_set_error(s);
return MSG_PROCESS_ERROR;
}
MSG_PROCESS_RETURN tls_process_server_hello(SSL *s, PACKET *pkt)
{
STACK_OF(SSL_CIPHER) *sk;
const SSL_CIPHER *c;
PACKET session_id, extpkt;
size_t session_id_len;
const unsigned char *cipherchars;
int i, al = SSL_AD_INTERNAL_ERROR;
unsigned int compression;
unsigned int sversion;
unsigned int context;
int protverr;
RAW_EXTENSION *extensions = NULL;
#ifndef OPENSSL_NO_COMP
SSL_COMP *comp;
#endif
if (!PACKET_get_net_2(pkt, &sversion)) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_LENGTH_MISMATCH);
goto f_err;
}
/* We do this immediately so we know what format the ServerHello is in */
protverr = ssl_choose_client_version(s, sversion);
if (protverr != 0) {
al = SSL_AD_PROTOCOL_VERSION;
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, protverr);
goto f_err;
}
/* load the server hello data */
/* load the server random */
if (!PACKET_copy_bytes(pkt, s->s3->server_random, SSL3_RANDOM_SIZE)) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_LENGTH_MISMATCH);
goto f_err;
}
/* Get the session-id. */
if (!SSL_IS_TLS13(s)) {
if (!PACKET_get_length_prefixed_1(pkt, &session_id)) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_LENGTH_MISMATCH);
goto f_err;
}
session_id_len = PACKET_remaining(&session_id);
if (session_id_len > sizeof s->session->session_id
|| session_id_len > SSL3_SESSION_ID_SIZE) {
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO,
SSL_R_SSL3_SESSION_ID_TOO_LONG);
goto f_err;
}
} else {
PACKET_null_init(&session_id);
session_id_len = 0;
}
if (!PACKET_get_bytes(pkt, &cipherchars, TLS_CIPHER_LEN)) {
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_LENGTH_MISMATCH);
al = SSL_AD_DECODE_ERROR;
goto f_err;
}
if (!SSL_IS_TLS13(s)) {
if (!PACKET_get_1(pkt, &compression)) {
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_LENGTH_MISMATCH);
al = SSL_AD_DECODE_ERROR;
goto f_err;
}
} else {
compression = 0;
}
/* TLS extensions */
if (PACKET_remaining(pkt) == 0) {
PACKET_null_init(&extpkt);
} else if (!PACKET_as_length_prefixed_2(pkt, &extpkt)) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_BAD_LENGTH);
goto f_err;
}
context = SSL_IS_TLS13(s) ? EXT_TLS1_3_SERVER_HELLO
: EXT_TLS1_2_SERVER_HELLO;
if (!tls_collect_extensions(s, &extpkt, context, &extensions, &al))
goto f_err;
s->hit = 0;
if (SSL_IS_TLS13(s)) {
/* This will set s->hit if we are resuming */
if (!tls_parse_extension(s, TLSEXT_IDX_psk,
EXT_TLS1_3_SERVER_HELLO,
extensions, NULL, 0, &al))
goto f_err;
} else {
/*
* Check if we can resume the session based on external pre-shared
* secret. EAP-FAST (RFC 4851) supports two types of session resumption.
* Resumption based on server-side state works with session IDs.
* Resumption based on pre-shared Protected Access Credentials (PACs)
* works by overriding the SessionTicket extension at the application
* layer, and does not send a session ID. (We do not know whether
* EAP-FAST servers would honour the session ID.) Therefore, the session
* ID alone is not a reliable indicator of session resumption, so we
* first check if we can resume, and later peek at the next handshake
* message to see if the server wants to resume.
*/
if (s->version >= TLS1_VERSION
&& s->ext.session_secret_cb != NULL && s->session->ext.tick) {
const SSL_CIPHER *pref_cipher = NULL;
/*
* s->session->master_key_length is a size_t, but this is an int for
* backwards compat reasons
*/
int master_key_length;
master_key_length = sizeof(s->session->master_key);
if (s->ext.session_secret_cb(s, s->session->master_key,
&master_key_length,
NULL, &pref_cipher,
s->ext.session_secret_cb_arg)
&& master_key_length > 0) {
s->session->master_key_length = master_key_length;
s->session->cipher = pref_cipher ?
pref_cipher : ssl_get_cipher_by_char(s, cipherchars);
} else {
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
al = SSL_AD_INTERNAL_ERROR;
goto f_err;
}
}
if (session_id_len != 0
&& session_id_len == s->session->session_id_length
&& memcmp(PACKET_data(&session_id), s->session->session_id,
session_id_len) == 0)
s->hit = 1;
}
if (s->hit) {
if (s->sid_ctx_length != s->session->sid_ctx_length
|| memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) {
/* actually a client application bug */
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO,
SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
goto f_err;
}
} else {
/*
* If we were trying for session-id reuse but the server
* didn't resume, make a new SSL_SESSION.
* In the case of EAP-FAST and PAC, we do not send a session ID,
* so the PAC-based session secret is always preserved. It'll be
* overwritten if the server refuses resumption.
*/
if (s->session->session_id_length > 0
|| (SSL_IS_TLS13(s)
&& s->session->ext.tick_identity
!= TLSEXT_PSK_BAD_IDENTITY)) {
s->ctx->stats.sess_miss++;
if (!ssl_get_new_session(s, 0)) {
goto f_err;
}
}
s->session->ssl_version = s->version;
s->session->session_id_length = session_id_len;
/* session_id_len could be 0 */
if (session_id_len > 0)
memcpy(s->session->session_id, PACKET_data(&session_id),
session_id_len);
}
/* Session version and negotiated protocol version should match */
if (s->version != s->session->ssl_version) {
al = SSL_AD_PROTOCOL_VERSION;
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO,
SSL_R_SSL_SESSION_VERSION_MISMATCH);
goto f_err;
}
c = ssl_get_cipher_by_char(s, cipherchars);
if (c == NULL) {
/* unknown cipher */
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_UNKNOWN_CIPHER_RETURNED);
goto f_err;
}
/*
* Now that we know the version, update the check to see if it's an allowed
* version.
*/
s->s3->tmp.min_ver = s->version;
s->s3->tmp.max_ver = s->version;
/*
* If it is a disabled cipher we either didn't send it in client hello,
* or it's not allowed for the selected protocol. So we return an error.
*/
if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK)) {
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
goto f_err;
}
sk = ssl_get_ciphers_by_id(s);
i = sk_SSL_CIPHER_find(sk, c);
if (i < 0) {
/* we did not say we would use this cipher */
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
goto f_err;
}
/*
* Depending on the session caching (internal/external), the cipher
* and/or cipher_id values may not be set. Make sure that cipher_id is
* set and use it for comparison.
*/
if (s->session->cipher)
s->session->cipher_id = s->session->cipher->id;
if (s->hit && (s->session->cipher_id != c->id)) {
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO,
SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
goto f_err;
}
s->s3->tmp.new_cipher = c;
#ifdef OPENSSL_NO_COMP
if (compression != 0) {
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO,
SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
goto f_err;
}
/*
* If compression is disabled we'd better not try to resume a session
* using compression.
*/
if (s->session->compress_meth != 0) {
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_INCONSISTENT_COMPRESSION);
goto f_err;
}
#else
if (s->hit && compression != s->session->compress_meth) {
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO,
SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
goto f_err;
}
if (compression == 0)
comp = NULL;
else if (!ssl_allow_compression(s)) {
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_COMPRESSION_DISABLED);
goto f_err;
} else {
comp = ssl3_comp_find(s->ctx->comp_methods, compression);
}
if (compression != 0 && comp == NULL) {
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO,
SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
goto f_err;
} else {
s->s3->tmp.new_compression = comp;
}
#endif
if (!tls_parse_all_extensions(s, context, extensions, NULL, 0, &al))
goto f_err;
#ifndef OPENSSL_NO_SCTP
if (SSL_IS_DTLS(s) && s->hit) {
unsigned char sctpauthkey[64];
char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
/*
* Add new shared key for SCTP-Auth, will be ignored if
* no SCTP used.
*/
memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
sizeof(DTLS1_SCTP_AUTH_LABEL));
if (SSL_export_keying_material(s, sctpauthkey,
sizeof(sctpauthkey),
labelbuffer,
sizeof(labelbuffer), NULL, 0, 0) <= 0)
goto f_err;
BIO_ctrl(SSL_get_wbio(s),
BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
sizeof(sctpauthkey), sctpauthkey);
}
#endif
/*
* In TLSv1.3 we have some post-processing to change cipher state, otherwise
* we're done with this message
*/
if (SSL_IS_TLS13(s)
&& (!s->method->ssl3_enc->setup_key_block(s)
|| !s->method->ssl3_enc->change_cipher_state(s,
SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_CLIENT_WRITE)
|| !s->method->ssl3_enc->change_cipher_state(s,
SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_CLIENT_READ))) {
al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_CANNOT_CHANGE_CIPHER);
goto f_err;
}
OPENSSL_free(extensions);
return MSG_PROCESS_CONTINUE_READING;
f_err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
ossl_statem_set_error(s);
OPENSSL_free(extensions);
return MSG_PROCESS_ERROR;
}
MSG_PROCESS_RETURN tls_process_server_certificate(SSL *s, PACKET *pkt)
{
int al, i, ret = MSG_PROCESS_ERROR, exp_idx;
unsigned long cert_list_len, cert_len;
X509 *x = NULL;
const unsigned char *certstart, *certbytes;
STACK_OF(X509) *sk = NULL;
EVP_PKEY *pkey = NULL;
size_t chainidx;
unsigned int context = 0;
if ((sk = sk_X509_new_null()) == NULL) {
SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
goto err;
}
if ((SSL_IS_TLS13(s) && !PACKET_get_1(pkt, &context))
|| context != 0
|| !PACKET_get_net_3(pkt, &cert_list_len)
|| PACKET_remaining(pkt) != cert_list_len) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
goto f_err;
}
for (chainidx = 0; PACKET_remaining(pkt); chainidx++) {
if (!PACKET_get_net_3(pkt, &cert_len)
|| !PACKET_get_bytes(pkt, &certbytes, cert_len)) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE,
SSL_R_CERT_LENGTH_MISMATCH);
goto f_err;
}
certstart = certbytes;
x = d2i_X509(NULL, (const unsigned char **)&certbytes, cert_len);
if (x == NULL) {
al = SSL_AD_BAD_CERTIFICATE;
SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, ERR_R_ASN1_LIB);
goto f_err;
}
if (certbytes != (certstart + cert_len)) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE,
SSL_R_CERT_LENGTH_MISMATCH);
goto f_err;
}
if (SSL_IS_TLS13(s)) {
RAW_EXTENSION *rawexts = NULL;
PACKET extensions;
if (!PACKET_get_length_prefixed_2(pkt, &extensions)) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, SSL_R_BAD_LENGTH);
goto f_err;
}
if (!tls_collect_extensions(s, &extensions, EXT_TLS1_3_CERTIFICATE,
&rawexts, &al)
|| !tls_parse_all_extensions(s, EXT_TLS1_3_CERTIFICATE,
rawexts, x, chainidx, &al)) {
OPENSSL_free(rawexts);
goto f_err;
}
OPENSSL_free(rawexts);
}
if (!sk_X509_push(sk, x)) {
SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
goto err;
}
x = NULL;
}
i = ssl_verify_cert_chain(s, sk);
/*
* The documented interface is that SSL_VERIFY_PEER should be set in order
* for client side verification of the server certificate to take place.
* However, historically the code has only checked that *any* flag is set
* to cause server verification to take place. Use of the other flags makes
* no sense in client mode. An attempt to clean up the semantics was
* reverted because at least one application *only* set
* SSL_VERIFY_FAIL_IF_NO_PEER_CERT. Prior to the clean up this still caused
* server verification to take place, after the clean up it silently did
* nothing. SSL_CTX_set_verify()/SSL_set_verify() cannot validate the flags
* sent to them because they are void functions. Therefore, we now use the
* (less clean) historic behaviour of performing validation if any flag is
* set. The *documented* interface remains the same.
*/
if (s->verify_mode != SSL_VERIFY_NONE && i <= 0) {
al = ssl_verify_alarm_type(s->verify_result);
SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE,
SSL_R_CERTIFICATE_VERIFY_FAILED);
goto f_err;
}
ERR_clear_error(); /* but we keep s->verify_result */
if (i > 1) {
SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, i);
al = SSL_AD_HANDSHAKE_FAILURE;
goto f_err;
}
s->session->peer_chain = sk;
/*
* Inconsistency alert: cert_chain does include the peer's certificate,
* which we don't include in statem_srvr.c
*/
x = sk_X509_value(sk, 0);
sk = NULL;
/*
* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end
*/
pkey = X509_get0_pubkey(x);
if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) {
x = NULL;
al = SSL3_AL_FATAL;
SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE,
SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
goto f_err;
}
i = ssl_cert_type(x, pkey);
if (i < 0) {
x = NULL;
al = SSL3_AL_FATAL;
SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE,
SSL_R_UNKNOWN_CERTIFICATE_TYPE);
goto f_err;
}
exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
if (exp_idx >= 0 && i != exp_idx
&& (exp_idx != SSL_PKEY_GOST_EC ||
(i != SSL_PKEY_GOST12_512 && i != SSL_PKEY_GOST12_256
&& i != SSL_PKEY_GOST01))) {
x = NULL;
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE,
SSL_R_WRONG_CERTIFICATE_TYPE);
goto f_err;
}
s->session->peer_type = i;
X509_free(s->session->peer);
X509_up_ref(x);
s->session->peer = x;
s->session->verify_result = s->verify_result;
x = NULL;
/* Save the current hash state for when we receive the CertificateVerify */
if (SSL_IS_TLS13(s)
&& !ssl_handshake_hash(s, s->cert_verify_hash,
sizeof(s->cert_verify_hash),
&s->cert_verify_hash_len)) {
al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
goto f_err;
}
ret = MSG_PROCESS_CONTINUE_READING;
goto done;
f_err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
err:
ossl_statem_set_error(s);
done:
X509_free(x);
sk_X509_pop_free(sk, X509_free);
return ret;
}
static int tls_process_ske_psk_preamble(SSL *s, PACKET *pkt, int *al)
{
#ifndef OPENSSL_NO_PSK
PACKET psk_identity_hint;
/* PSK ciphersuites are preceded by an identity hint */
if (!PACKET_get_length_prefixed_2(pkt, &psk_identity_hint)) {
*al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_PSK_PREAMBLE, SSL_R_LENGTH_MISMATCH);
return 0;
}
/*
* Store PSK identity hint for later use, hint is used in
* tls_construct_client_key_exchange. Assume that the maximum length of
* a PSK identity hint can be as long as the maximum length of a PSK
* identity.
*/
if (PACKET_remaining(&psk_identity_hint) > PSK_MAX_IDENTITY_LEN) {
*al = SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_TLS_PROCESS_SKE_PSK_PREAMBLE, SSL_R_DATA_LENGTH_TOO_LONG);
return 0;
}
if (PACKET_remaining(&psk_identity_hint) == 0) {
OPENSSL_free(s->session->psk_identity_hint);
s->session->psk_identity_hint = NULL;
} else if (!PACKET_strndup(&psk_identity_hint,
&s->session->psk_identity_hint)) {
*al = SSL_AD_INTERNAL_ERROR;
return 0;
}
return 1;
#else
SSLerr(SSL_F_TLS_PROCESS_SKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
*al = SSL_AD_INTERNAL_ERROR;
return 0;
#endif
}
static int tls_process_ske_srp(SSL *s, PACKET *pkt, EVP_PKEY **pkey, int *al)
{
#ifndef OPENSSL_NO_SRP
PACKET prime, generator, salt, server_pub;
if (!PACKET_get_length_prefixed_2(pkt, &prime)
|| !PACKET_get_length_prefixed_2(pkt, &generator)
|| !PACKET_get_length_prefixed_1(pkt, &salt)
|| !PACKET_get_length_prefixed_2(pkt, &server_pub)) {
*al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_SRP, SSL_R_LENGTH_MISMATCH);
return 0;
}
/* TODO(size_t): Convert BN_bin2bn() calls */
if ((s->srp_ctx.N =
BN_bin2bn(PACKET_data(&prime),
(int)PACKET_remaining(&prime), NULL)) == NULL
|| (s->srp_ctx.g =
BN_bin2bn(PACKET_data(&generator),
(int)PACKET_remaining(&generator), NULL)) == NULL
|| (s->srp_ctx.s =
BN_bin2bn(PACKET_data(&salt),
(int)PACKET_remaining(&salt), NULL)) == NULL
|| (s->srp_ctx.B =
BN_bin2bn(PACKET_data(&server_pub),
(int)PACKET_remaining(&server_pub), NULL)) == NULL) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_SRP, ERR_R_BN_LIB);
return 0;
}
if (!srp_verify_server_param(s, al)) {
*al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_SRP, SSL_R_BAD_SRP_PARAMETERS);
return 0;
}
/* We must check if there is a certificate */
if (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aRSA | SSL_aDSS))
*pkey = X509_get0_pubkey(s->session->peer);
return 1;
#else
SSLerr(SSL_F_TLS_PROCESS_SKE_SRP, ERR_R_INTERNAL_ERROR);
*al = SSL_AD_INTERNAL_ERROR;
return 0;
#endif
}
static int tls_process_ske_dhe(SSL *s, PACKET *pkt, EVP_PKEY **pkey, int *al)
{
#ifndef OPENSSL_NO_DH
PACKET prime, generator, pub_key;
EVP_PKEY *peer_tmp = NULL;
DH *dh = NULL;
BIGNUM *p = NULL, *g = NULL, *bnpub_key = NULL;
int check_bits = 0;
if (!PACKET_get_length_prefixed_2(pkt, &prime)
|| !PACKET_get_length_prefixed_2(pkt, &generator)
|| !PACKET_get_length_prefixed_2(pkt, &pub_key)) {
*al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, SSL_R_LENGTH_MISMATCH);
return 0;
}
peer_tmp = EVP_PKEY_new();
dh = DH_new();
if (peer_tmp == NULL || dh == NULL) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_MALLOC_FAILURE);
goto err;
}
/* TODO(size_t): Convert these calls */
p = BN_bin2bn(PACKET_data(&prime), (int)PACKET_remaining(&prime), NULL);
g = BN_bin2bn(PACKET_data(&generator), (int)PACKET_remaining(&generator),
NULL);
bnpub_key = BN_bin2bn(PACKET_data(&pub_key),
(int)PACKET_remaining(&pub_key), NULL);
if (p == NULL || g == NULL || bnpub_key == NULL) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_BN_LIB);
goto err;
}
/* test non-zero pupkey */
if (BN_is_zero(bnpub_key)) {
*al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, SSL_R_BAD_DH_VALUE);
goto err;
}
if (!DH_set0_pqg(dh, p, NULL, g)) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_BN_LIB);
goto err;
}
p = g = NULL;
if (DH_check_params(dh, &check_bits) == 0 || check_bits != 0) {
*al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, SSL_R_BAD_DH_VALUE);
goto err;
}
if (!DH_set0_key(dh, bnpub_key, NULL)) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_BN_LIB);
goto err;
}
bnpub_key = NULL;
if (!ssl_security(s, SSL_SECOP_TMP_DH, DH_security_bits(dh), 0, dh)) {
*al = SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, SSL_R_DH_KEY_TOO_SMALL);
goto err;
}
if (EVP_PKEY_assign_DH(peer_tmp, dh) == 0) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_EVP_LIB);
goto err;
}
s->s3->peer_tmp = peer_tmp;
/*
* FIXME: This makes assumptions about which ciphersuites come with
* public keys. We should have a less ad-hoc way of doing this
*/
if (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aRSA | SSL_aDSS))
*pkey = X509_get0_pubkey(s->session->peer);
/* else anonymous DH, so no certificate or pkey. */
return 1;
err:
BN_free(p);
BN_free(g);
BN_free(bnpub_key);
DH_free(dh);
EVP_PKEY_free(peer_tmp);
return 0;
#else
SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_INTERNAL_ERROR);
*al = SSL_AD_INTERNAL_ERROR;
return 0;
#endif
}
static int tls_process_ske_ecdhe(SSL *s, PACKET *pkt, EVP_PKEY **pkey, int *al)
{
#ifndef OPENSSL_NO_EC
PACKET encoded_pt;
const unsigned char *ecparams;
int curve_nid;
unsigned int curve_flags;
EVP_PKEY_CTX *pctx = NULL;
/*
* Extract elliptic curve parameters and the server's ephemeral ECDH
* public key. For now we only support named (not generic) curves and
* ECParameters in this case is just three bytes.
*/
if (!PACKET_get_bytes(pkt, &ecparams, 3)) {
*al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, SSL_R_LENGTH_TOO_SHORT);
return 0;
}
/*
* Check curve is one of our preferences, if not server has sent an
* invalid curve. ECParameters is 3 bytes.
*/
if (!tls1_check_curve(s, ecparams, 3)) {
*al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, SSL_R_WRONG_CURVE);
return 0;
}
curve_nid = tls1_ec_curve_id2nid(*(ecparams + 2), &curve_flags);
if (curve_nid == 0) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE,
SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
return 0;
}
if ((curve_flags & TLS_CURVE_TYPE) == TLS_CURVE_CUSTOM) {
EVP_PKEY *key = EVP_PKEY_new();
if (key == NULL || !EVP_PKEY_set_type(key, curve_nid)) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, ERR_R_EVP_LIB);
EVP_PKEY_free(key);
return 0;
}
s->s3->peer_tmp = key;
} else {
/* Set up EVP_PKEY with named curve as parameters */
pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_EC, NULL);
if (pctx == NULL
|| EVP_PKEY_paramgen_init(pctx) <= 0
|| EVP_PKEY_CTX_set_ec_paramgen_curve_nid(pctx, curve_nid) <= 0
|| EVP_PKEY_paramgen(pctx, &s->s3->peer_tmp) <= 0) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, ERR_R_EVP_LIB);
EVP_PKEY_CTX_free(pctx);
return 0;
}
EVP_PKEY_CTX_free(pctx);
pctx = NULL;
}
if (!PACKET_get_length_prefixed_1(pkt, &encoded_pt)) {
*al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, SSL_R_LENGTH_MISMATCH);
return 0;
}
if (!EVP_PKEY_set1_tls_encodedpoint(s->s3->peer_tmp,
PACKET_data(&encoded_pt),
PACKET_remaining(&encoded_pt))) {
*al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, SSL_R_BAD_ECPOINT);
return 0;
}
/*
* The ECC/TLS specification does not mention the use of DSA to sign
* ECParameters in the server key exchange message. We do support RSA
* and ECDSA.
*/
if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aECDSA)
*pkey = X509_get0_pubkey(s->session->peer);
else if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aRSA)
*pkey = X509_get0_pubkey(s->session->peer);
/* else anonymous ECDH, so no certificate or pkey. */
return 1;
#else
SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, ERR_R_INTERNAL_ERROR);
*al = SSL_AD_INTERNAL_ERROR;
return 0;
#endif
}
MSG_PROCESS_RETURN tls_process_key_exchange(SSL *s, PACKET *pkt)
{
int al = -1, ispss = 0;
long alg_k;
EVP_PKEY *pkey = NULL;
EVP_MD_CTX *md_ctx = NULL;
EVP_PKEY_CTX *pctx = NULL;
PACKET save_param_start, signature;
alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
save_param_start = *pkt;
#if !defined(OPENSSL_NO_EC) || !defined(OPENSSL_NO_DH)
EVP_PKEY_free(s->s3->peer_tmp);
s->s3->peer_tmp = NULL;
#endif
if (alg_k & SSL_PSK) {
if (!tls_process_ske_psk_preamble(s, pkt, &al))
goto err;
}
/* Nothing else to do for plain PSK or RSAPSK */
if (alg_k & (SSL_kPSK | SSL_kRSAPSK)) {
} else if (alg_k & SSL_kSRP) {
if (!tls_process_ske_srp(s, pkt, &pkey, &al))
goto err;
} else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) {
if (!tls_process_ske_dhe(s, pkt, &pkey, &al))
goto err;
} else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) {
if (!tls_process_ske_ecdhe(s, pkt, &pkey, &al))
goto err;
} else if (alg_k) {
al = SSL_AD_UNEXPECTED_MESSAGE;
SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
goto err;
}
/* if it was signed, check the signature */
if (pkey != NULL) {
PACKET params;
int maxsig;
const EVP_MD *md = NULL;
/*
* |pkt| now points to the beginning of the signature, so the difference
* equals the length of the parameters.
*/
if (!PACKET_get_sub_packet(&save_param_start, &params,
PACKET_remaining(&save_param_start) -
PACKET_remaining(pkt))) {
al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
goto err;
}
if (SSL_USE_SIGALGS(s)) {
unsigned int sigalg;
int rv;
if (!PACKET_get_net_2(pkt, &sigalg)) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
goto err;
}
rv = tls12_check_peer_sigalg(&md, s, sigalg, pkey);
if (rv == -1) {
al = SSL_AD_INTERNAL_ERROR;
goto err;
} else if (rv == 0) {
al = SSL_AD_DECODE_ERROR;
goto err;
}
ispss = SIGID_IS_PSS(sigalg);
#ifdef SSL_DEBUG
fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
#endif
} else if (EVP_PKEY_id(pkey) == EVP_PKEY_RSA) {
md = EVP_md5_sha1();
} else {
md = EVP_sha1();
}
if (!PACKET_get_length_prefixed_2(pkt, &signature)
|| PACKET_remaining(pkt) != 0) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH);
goto err;
}
maxsig = EVP_PKEY_size(pkey);
if (maxsig < 0) {
al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
goto err;
}
/*
* Check signature length
*/
if (PACKET_remaining(&signature) > (size_t)maxsig) {
/* wrong packet length */
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE,
SSL_R_WRONG_SIGNATURE_LENGTH);
goto err;
}
md_ctx = EVP_MD_CTX_new();
if (md_ctx == NULL) {
al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
goto err;
}
if (EVP_DigestVerifyInit(md_ctx, &pctx, md, NULL, pkey) <= 0) {
al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, ERR_R_EVP_LIB);
goto err;
}
if (ispss) {
if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0
/* -1 here means set saltlen to the digest len */
|| EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1) <= 0) {
al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, ERR_R_EVP_LIB);
goto err;
}
}
if (EVP_DigestVerifyUpdate(md_ctx, &(s->s3->client_random[0]),
SSL3_RANDOM_SIZE) <= 0
|| EVP_DigestVerifyUpdate(md_ctx, &(s->s3->server_random[0]),
SSL3_RANDOM_SIZE) <= 0
|| EVP_DigestVerifyUpdate(md_ctx, PACKET_data(&params),
PACKET_remaining(&params)) <= 0) {
al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, ERR_R_EVP_LIB);
goto err;
}
if (EVP_DigestVerifyFinal(md_ctx, PACKET_data(&signature),
PACKET_remaining(&signature)) <= 0) {
/* bad signature */
al = SSL_AD_DECRYPT_ERROR;
SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
goto err;
}
EVP_MD_CTX_free(md_ctx);
md_ctx = NULL;
} else {
/* aNULL, aSRP or PSK do not need public keys */
if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP))
&& !(alg_k & SSL_PSK)) {
/* Might be wrong key type, check it */
if (ssl3_check_cert_and_algorithm(s)) {
/* Otherwise this shouldn't happen */
al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
} else {
al = SSL_AD_DECODE_ERROR;
}
goto err;
}
/* still data left over */
if (PACKET_remaining(pkt) != 0) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, SSL_R_EXTRA_DATA_IN_MESSAGE);
goto err;
}
}
return MSG_PROCESS_CONTINUE_READING;
err:
if (al != -1)
ssl3_send_alert(s, SSL3_AL_FATAL, al);
ossl_statem_set_error(s);
EVP_MD_CTX_free(md_ctx);
return MSG_PROCESS_ERROR;
}
MSG_PROCESS_RETURN tls_process_certificate_request(SSL *s, PACKET *pkt)
{
int ret = MSG_PROCESS_ERROR;
unsigned int list_len, ctype_num, i, name_len;
X509_NAME *xn = NULL;
const unsigned char *data;
const unsigned char *namestart, *namebytes;
STACK_OF(X509_NAME) *ca_sk = NULL;
if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) {
SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
goto err;
}
/* get the certificate types */
if (!PACKET_get_1(pkt, &ctype_num)
|| !PACKET_get_bytes(pkt, &data, ctype_num)) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH);
goto err;
}
OPENSSL_free(s->cert->ctypes);
s->cert->ctypes = NULL;
if (ctype_num > SSL3_CT_NUMBER) {
/* If we exceed static buffer copy all to cert structure */
s->cert->ctypes = OPENSSL_malloc(ctype_num);
if (s->cert->ctypes == NULL) {
SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
goto err;
}
memcpy(s->cert->ctypes, data, ctype_num);
s->cert->ctype_num = ctype_num;
ctype_num = SSL3_CT_NUMBER;
}
for (i = 0; i < ctype_num; i++)
s->s3->tmp.ctype[i] = data[i];
if (SSL_USE_SIGALGS(s)) {
PACKET sigalgs;
if (!PACKET_get_length_prefixed_2(pkt, &sigalgs)) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST,
SSL_R_LENGTH_MISMATCH);
goto err;
}
/* Clear certificate digests and validity flags */
for (i = 0; i < SSL_PKEY_NUM; i++) {
s->s3->tmp.md[i] = NULL;
s->s3->tmp.valid_flags[i] = 0;
}
if (!tls1_save_sigalgs(s, &sigalgs)) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST,
SSL_R_SIGNATURE_ALGORITHMS_ERROR);
goto err;
}
if (!tls1_process_sigalgs(s)) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
goto err;
}
} else {
ssl_set_default_md(s);
}
/* get the CA RDNs */
if (!PACKET_get_net_2(pkt, &list_len)
|| PACKET_remaining(pkt) != list_len) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH);
goto err;
}
while (PACKET_remaining(pkt)) {
if (!PACKET_get_net_2(pkt, &name_len)
|| !PACKET_get_bytes(pkt, &namebytes, name_len)) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST,
SSL_R_LENGTH_MISMATCH);
goto err;
}
namestart = namebytes;
if ((xn = d2i_X509_NAME(NULL, (const unsigned char **)&namebytes,
name_len)) == NULL) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, ERR_R_ASN1_LIB);
goto err;
}
if (namebytes != (namestart + name_len)) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST,
SSL_R_CA_DN_LENGTH_MISMATCH);
goto err;
}
if (!sk_X509_NAME_push(ca_sk, xn)) {
SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
goto err;
}
xn = NULL;
}
/* we should setup a certificate to return.... */
s->s3->tmp.cert_req = 1;
s->s3->tmp.ctype_num = ctype_num;
sk_X509_NAME_pop_free(s->s3->tmp.ca_names, X509_NAME_free);
s->s3->tmp.ca_names = ca_sk;
ca_sk = NULL;
ret = MSG_PROCESS_CONTINUE_PROCESSING;
goto done;
err:
ossl_statem_set_error(s);
done:
X509_NAME_free(xn);
sk_X509_NAME_pop_free(ca_sk, X509_NAME_free);
return ret;
}
static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
{
return (X509_NAME_cmp(*a, *b));
}
MSG_PROCESS_RETURN tls_process_new_session_ticket(SSL *s, PACKET *pkt)
{
int al;
unsigned int ticklen;
unsigned long ticket_lifetime_hint, age_add;
unsigned int sess_len;
RAW_EXTENSION *exts = NULL;
if (!PACKET_get_net_4(pkt, &ticket_lifetime_hint)
|| (SSL_IS_TLS13(s) && !PACKET_get_net_4(pkt, &age_add))
|| !PACKET_get_net_2(pkt, &ticklen)
|| (!SSL_IS_TLS13(s) && PACKET_remaining(pkt) != ticklen)
|| (SSL_IS_TLS13(s) && (ticklen == 0
|| PACKET_remaining(pkt) < ticklen))) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
goto f_err;
}
/*
* Server is allowed to change its mind (in <=TLSv1.2) and send an empty
* ticket. We already checked this TLSv1.3 case above, so it should never
* be 0 here in that instance
*/
if (ticklen == 0)
return MSG_PROCESS_CONTINUE_READING;
/* TODO(TLS1.3): Is this a suitable test for TLS1.3? */
if (s->session->session_id_length > 0) {
int i = s->session_ctx->session_cache_mode;
SSL_SESSION *new_sess;
/*
* We reused an existing session, so we need to replace it with a new
* one
*/
if (i & SSL_SESS_CACHE_CLIENT) {
/*
* Remove the old session from the cache. We carry on if this fails
*/
SSL_CTX_remove_session(s->session_ctx, s->session);
}
if ((new_sess = ssl_session_dup(s->session, 0)) == 0) {
al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
goto f_err;
}
SSL_SESSION_free(s->session);
s->session = new_sess;
}
/*
* Technically the cast to long here is not guaranteed by the C standard -
* but we use it elsewhere, so this should be ok.
*/
s->session->time = (long)time(NULL);
OPENSSL_free(s->session->ext.tick);
s->session->ext.tick = NULL;
s->session->ext.ticklen = 0;
s->session->ext.tick = OPENSSL_malloc(ticklen);
if (s->session->ext.tick == NULL) {
SSLerr(SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!PACKET_copy_bytes(pkt, s->session->ext.tick, ticklen)) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
goto f_err;
}
s->session->ext.tick_lifetime_hint = ticket_lifetime_hint;
s->session->ext.tick_age_add = age_add;
s->session->ext.ticklen = ticklen;
if (SSL_IS_TLS13(s)) {
PACKET extpkt;
if (!PACKET_as_length_prefixed_2(pkt, &extpkt)
|| !tls_collect_extensions(s, &extpkt,
EXT_TLS1_3_NEW_SESSION_TICKET,
&exts, &al)
|| !tls_parse_all_extensions(s, EXT_TLS1_3_NEW_SESSION_TICKET,
exts, NULL, 0, &al)) {
SSLerr(SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, SSL_R_BAD_EXTENSION);
goto f_err;
}
}
/*
* There are two ways to detect a resumed ticket session. One is to set
* an appropriate session ID and then the server must return a match in
* ServerHello. This allows the normal client session ID matching to work
* and we know much earlier that the ticket has been accepted. The
* other way is to set zero length session ID when the ticket is
* presented and rely on the handshake to determine session resumption.
* We choose the former approach because this fits in with assumptions
* elsewhere in OpenSSL. The session ID is set to the SHA256 (or SHA1 is
* SHA256 is disabled) hash of the ticket.
*/
/*
* TODO(size_t): we use sess_len here because EVP_Digest expects an int
* but s->session->session_id_length is a size_t
*/
if (!EVP_Digest(s->session->ext.tick, ticklen,
s->session->session_id, &sess_len,
EVP_sha256(), NULL)) {
SSLerr(SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, ERR_R_EVP_LIB);
goto err;
}
s->session->session_id_length = sess_len;
/* This is a standalone message in TLSv1.3, so there is no more to read */
if (SSL_IS_TLS13(s)) {
ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
return MSG_PROCESS_FINISHED_READING;
}
return MSG_PROCESS_CONTINUE_READING;
f_err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
err:
ossl_statem_set_error(s);
return MSG_PROCESS_ERROR;
}
/*
* In TLSv1.3 this is called from the extensions code, otherwise it is used to
* parse a separate message. Returns 1 on success or 0 on failure. On failure
* |*al| is populated with a suitable alert code.
*/
int tls_process_cert_status_body(SSL *s, PACKET *pkt, int *al)
{
size_t resplen;
unsigned int type;
if (!PACKET_get_1(pkt, &type)
|| type != TLSEXT_STATUSTYPE_ocsp) {
*al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_CERT_STATUS_BODY,
SSL_R_UNSUPPORTED_STATUS_TYPE);
return 0;
}
if (!PACKET_get_net_3_len(pkt, &resplen)
|| PACKET_remaining(pkt) != resplen) {
*al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_CERT_STATUS_BODY, SSL_R_LENGTH_MISMATCH);
return 0;
}
s->ext.ocsp.resp = OPENSSL_malloc(resplen);
if (s->ext.ocsp.resp == NULL) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_CERT_STATUS_BODY, ERR_R_MALLOC_FAILURE);
return 0;
}
if (!PACKET_copy_bytes(pkt, s->ext.ocsp.resp, resplen)) {
*al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_CERT_STATUS_BODY, SSL_R_LENGTH_MISMATCH);
return 0;
}
s->ext.ocsp.resp_len = resplen;
return 1;
}
MSG_PROCESS_RETURN tls_process_cert_status(SSL *s, PACKET *pkt)
{
int al;
if (!tls_process_cert_status_body(s, pkt, &al)) {
ssl3_send_alert(s, SSL3_AL_FATAL, al);
ossl_statem_set_error(s);
return MSG_PROCESS_ERROR;
}
return MSG_PROCESS_CONTINUE_READING;
}
/*
* Perform miscellaneous checks and processing after we have received the
* server's initial flight. In TLS1.3 this is after the Server Finished message.
* In <=TLS1.2 this is after the ServerDone message. Returns 1 on success or 0
* on failure.
*/
int tls_process_initial_server_flight(SSL *s, int *al)
{
/*
* at this point we check that we have the required stuff from
* the server
*/
if (!ssl3_check_cert_and_algorithm(s)) {
*al = SSL_AD_HANDSHAKE_FAILURE;
return 0;
}
/*
* Call the ocsp status callback if needed. The |ext.ocsp.resp| and
* |ext.ocsp.resp_len| values will be set if we actually received a status
* message, or NULL and -1 otherwise
*/
if (s->ext.status_type != TLSEXT_STATUSTYPE_nothing
&& s->ctx->ext.status_cb != NULL) {
int ret = s->ctx->ext.status_cb(s, s->ctx->ext.status_arg);
if (ret == 0) {
*al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
SSLerr(SSL_F_TLS_PROCESS_INITIAL_SERVER_FLIGHT,
SSL_R_INVALID_STATUS_RESPONSE);
return 0;
}
if (ret < 0) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_INITIAL_SERVER_FLIGHT,
ERR_R_MALLOC_FAILURE);
return 0;
}
}
#ifndef OPENSSL_NO_CT
if (s->ct_validation_callback != NULL) {
/* Note we validate the SCTs whether or not we abort on error */
if (!ssl_validate_ct(s) && (s->verify_mode & SSL_VERIFY_PEER)) {
*al = SSL_AD_HANDSHAKE_FAILURE;
return 0;
}
}
#endif
return 1;
}
MSG_PROCESS_RETURN tls_process_server_done(SSL *s, PACKET *pkt)
{
int al = SSL_AD_INTERNAL_ERROR;
if (PACKET_remaining(pkt) > 0) {
/* should contain no data */
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_SERVER_DONE, SSL_R_LENGTH_MISMATCH);
goto err;
}
#ifndef OPENSSL_NO_SRP
if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) {
if (SRP_Calc_A_param(s) <= 0) {
SSLerr(SSL_F_TLS_PROCESS_SERVER_DONE, SSL_R_SRP_A_CALC);
goto err;
}
}
#endif
/*
* Error queue messages are generated directly by this function
*/
if (!tls_process_initial_server_flight(s, &al))
goto err;
#ifndef OPENSSL_NO_SCTP
/* Only applies to renegotiation */
if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))
&& s->renegotiate != 0)
return MSG_PROCESS_CONTINUE_PROCESSING;
else
#endif
return MSG_PROCESS_FINISHED_READING;
err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
ossl_statem_set_error(s);
return MSG_PROCESS_ERROR;
}
static int tls_construct_cke_psk_preamble(SSL *s, WPACKET *pkt, int *al)
{
#ifndef OPENSSL_NO_PSK
int ret = 0;
/*
* The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes to return a
* \0-terminated identity. The last byte is for us for simulating
* strnlen.
*/
char identity[PSK_MAX_IDENTITY_LEN + 1];
size_t identitylen = 0;
unsigned char psk[PSK_MAX_PSK_LEN];
unsigned char *tmppsk = NULL;
char *tmpidentity = NULL;
size_t psklen = 0;
if (s->psk_client_callback == NULL) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, SSL_R_PSK_NO_CLIENT_CB);
*al = SSL_AD_INTERNAL_ERROR;
goto err;
}
memset(identity, 0, sizeof(identity));
psklen = s->psk_client_callback(s, s->session->psk_identity_hint,
identity, sizeof(identity) - 1,
psk, sizeof(psk));
if (psklen > PSK_MAX_PSK_LEN) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
*al = SSL_AD_HANDSHAKE_FAILURE;
goto err;
} else if (psklen == 0) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE,
SSL_R_PSK_IDENTITY_NOT_FOUND);
*al = SSL_AD_HANDSHAKE_FAILURE;
goto err;
}
identitylen = strlen(identity);
if (identitylen > PSK_MAX_IDENTITY_LEN) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
*al = SSL_AD_HANDSHAKE_FAILURE;
goto err;
}
tmppsk = OPENSSL_memdup(psk, psklen);
tmpidentity = OPENSSL_strdup(identity);
if (tmppsk == NULL || tmpidentity == NULL) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, ERR_R_MALLOC_FAILURE);
*al = SSL_AD_INTERNAL_ERROR;
goto err;
}
OPENSSL_free(s->s3->tmp.psk);
s->s3->tmp.psk = tmppsk;
s->s3->tmp.psklen = psklen;
tmppsk = NULL;
OPENSSL_free(s->session->psk_identity);
s->session->psk_identity = tmpidentity;
tmpidentity = NULL;
if (!WPACKET_sub_memcpy_u16(pkt, identity, identitylen)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
*al = SSL_AD_INTERNAL_ERROR;
goto err;
}
ret = 1;
err:
OPENSSL_cleanse(psk, psklen);
OPENSSL_cleanse(identity, sizeof(identity));
OPENSSL_clear_free(tmppsk, psklen);
OPENSSL_clear_free(tmpidentity, identitylen);
return ret;
#else
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
*al = SSL_AD_INTERNAL_ERROR;
return 0;
#endif
}
static int tls_construct_cke_rsa(SSL *s, WPACKET *pkt, int *al)
{
#ifndef OPENSSL_NO_RSA
unsigned char *encdata = NULL;
EVP_PKEY *pkey = NULL;
EVP_PKEY_CTX *pctx = NULL;
size_t enclen;
unsigned char *pms = NULL;
size_t pmslen = 0;
if (s->session->peer == NULL) {
/*
* We should always have a server certificate with SSL_kRSA.
*/
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_INTERNAL_ERROR);
return 0;
}
pkey = X509_get0_pubkey(s->session->peer);
if (EVP_PKEY_get0_RSA(pkey) == NULL) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_INTERNAL_ERROR);
return 0;
}
pmslen = SSL_MAX_MASTER_KEY_LENGTH;
pms = OPENSSL_malloc(pmslen);
if (pms == NULL) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_MALLOC_FAILURE);
*al = SSL_AD_INTERNAL_ERROR;
return 0;
}
pms[0] = s->client_version >> 8;
pms[1] = s->client_version & 0xff;
/* TODO(size_t): Convert this function */
if (RAND_bytes(pms + 2, (int)(pmslen - 2)) <= 0) {
goto err;
}
/* Fix buf for TLS and beyond */
if (s->version > SSL3_VERSION && !WPACKET_start_sub_packet_u16(pkt)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_INTERNAL_ERROR);
goto err;
}
pctx = EVP_PKEY_CTX_new(pkey, NULL);
if (pctx == NULL || EVP_PKEY_encrypt_init(pctx) <= 0
|| EVP_PKEY_encrypt(pctx, NULL, &enclen, pms, pmslen) <= 0) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_EVP_LIB);
goto err;
}
if (!WPACKET_allocate_bytes(pkt, enclen, &encdata)
|| EVP_PKEY_encrypt(pctx, encdata, &enclen, pms, pmslen) <= 0) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, SSL_R_BAD_RSA_ENCRYPT);
goto err;
}
EVP_PKEY_CTX_free(pctx);
pctx = NULL;
# ifdef PKCS1_CHECK
if (s->options & SSL_OP_PKCS1_CHECK_1)
(*p)[1]++;
if (s->options & SSL_OP_PKCS1_CHECK_2)
tmp_buf[0] = 0x70;
# endif
/* Fix buf for TLS and beyond */
if (s->version > SSL3_VERSION && !WPACKET_close(pkt)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_INTERNAL_ERROR);
goto err;
}
s->s3->tmp.pms = pms;
s->s3->tmp.pmslen = pmslen;
/* Log the premaster secret, if logging is enabled. */
if (!ssl_log_rsa_client_key_exchange(s, encdata, enclen, pms, pmslen))
goto err;
return 1;
err:
OPENSSL_clear_free(pms, pmslen);
EVP_PKEY_CTX_free(pctx);
return 0;
#else
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_INTERNAL_ERROR);
*al = SSL_AD_INTERNAL_ERROR;
return 0;
#endif
}
static int tls_construct_cke_dhe(SSL *s, WPACKET *pkt, int *al)
{
#ifndef OPENSSL_NO_DH
DH *dh_clnt = NULL;
const BIGNUM *pub_key;
EVP_PKEY *ckey = NULL, *skey = NULL;
unsigned char *keybytes = NULL;
skey = s->s3->peer_tmp;
if (skey == NULL)
goto err;
ckey = ssl_generate_pkey(skey);
if (ckey == NULL)
goto err;
dh_clnt = EVP_PKEY_get0_DH(ckey);
if (dh_clnt == NULL || ssl_derive(s, ckey, skey, 0) == 0)
goto err;
/* send off the data */
DH_get0_key(dh_clnt, &pub_key, NULL);
if (!WPACKET_sub_allocate_bytes_u16(pkt, BN_num_bytes(pub_key), &keybytes))
goto err;
BN_bn2bin(pub_key, keybytes);
EVP_PKEY_free(ckey);
return 1;
err:
EVP_PKEY_free(ckey);
#endif
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_DHE, ERR_R_INTERNAL_ERROR);
*al = SSL_AD_INTERNAL_ERROR;
return 0;
}
static int tls_construct_cke_ecdhe(SSL *s, WPACKET *pkt, int *al)
{
#ifndef OPENSSL_NO_EC
unsigned char *encodedPoint = NULL;
size_t encoded_pt_len = 0;
EVP_PKEY *ckey = NULL, *skey = NULL;
int ret = 0;
skey = s->s3->peer_tmp;
if (skey == NULL) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_ECDHE, ERR_R_INTERNAL_ERROR);
return 0;
}
ckey = ssl_generate_pkey(skey);
if (ckey == NULL) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_ECDHE, ERR_R_MALLOC_FAILURE);
goto err;
}
if (ssl_derive(s, ckey, skey, 0) == 0) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_ECDHE, ERR_R_EVP_LIB);
goto err;
}
/* Generate encoding of client key */
encoded_pt_len = EVP_PKEY_get1_tls_encodedpoint(ckey, &encodedPoint);
if (encoded_pt_len == 0) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_ECDHE, ERR_R_EC_LIB);
goto err;
}
if (!WPACKET_sub_memcpy_u8(pkt, encodedPoint, encoded_pt_len)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_ECDHE, ERR_R_INTERNAL_ERROR);
goto err;
}
ret = 1;
err:
OPENSSL_free(encodedPoint);
EVP_PKEY_free(ckey);
return ret;
#else
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_ECDHE, ERR_R_INTERNAL_ERROR);
*al = SSL_AD_INTERNAL_ERROR;
return 0;
#endif
}
static int tls_construct_cke_gost(SSL *s, WPACKET *pkt, int *al)
{
#ifndef OPENSSL_NO_GOST
/* GOST key exchange message creation */
EVP_PKEY_CTX *pkey_ctx = NULL;
X509 *peer_cert;
size_t msglen;
unsigned int md_len;
unsigned char shared_ukm[32], tmp[256];
EVP_MD_CTX *ukm_hash = NULL;
int dgst_nid = NID_id_GostR3411_94;
unsigned char *pms = NULL;
size_t pmslen = 0;
if ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aGOST12) != 0)
dgst_nid = NID_id_GostR3411_2012_256;
/*
* Get server sertificate PKEY and create ctx from it
*/
peer_cert = s->session->peer;
if (!peer_cert) {
*al = SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST,
SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
return 0;
}
pkey_ctx = EVP_PKEY_CTX_new(X509_get0_pubkey(peer_cert), NULL);
if (pkey_ctx == NULL) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, ERR_R_MALLOC_FAILURE);
return 0;
}
/*
* If we have send a certificate, and certificate key
* parameters match those of server certificate, use
* certificate key for key exchange
*/
/* Otherwise, generate ephemeral key pair */
pmslen = 32;
pms = OPENSSL_malloc(pmslen);
if (pms == NULL) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, ERR_R_MALLOC_FAILURE);
goto err;
}
if (EVP_PKEY_encrypt_init(pkey_ctx) <= 0
/* Generate session key
* TODO(size_t): Convert this function
*/
|| RAND_bytes(pms, (int)pmslen) <= 0) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, ERR_R_INTERNAL_ERROR);
goto err;
};
/*
* Compute shared IV and store it in algorithm-specific context
* data
*/
ukm_hash = EVP_MD_CTX_new();
if (ukm_hash == NULL
|| EVP_DigestInit(ukm_hash, EVP_get_digestbynid(dgst_nid)) <= 0
|| EVP_DigestUpdate(ukm_hash, s->s3->client_random,
SSL3_RANDOM_SIZE) <= 0
|| EVP_DigestUpdate(ukm_hash, s->s3->server_random,
SSL3_RANDOM_SIZE) <= 0
|| EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len) <= 0) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, ERR_R_INTERNAL_ERROR);
goto err;
}
EVP_MD_CTX_free(ukm_hash);
ukm_hash = NULL;
if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT,
EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, SSL_R_LIBRARY_BUG);
goto err;
}
/* Make GOST keytransport blob message */
/*
* Encapsulate it into sequence
*/
msglen = 255;
if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, pms, pmslen) <= 0) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, SSL_R_LIBRARY_BUG);
goto err;
}
if (!WPACKET_put_bytes_u8(pkt, V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED)
|| (msglen >= 0x80 && !WPACKET_put_bytes_u8(pkt, 0x81))
|| !WPACKET_sub_memcpy_u8(pkt, tmp, msglen)) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, ERR_R_INTERNAL_ERROR);
goto err;
}
EVP_PKEY_CTX_free(pkey_ctx);
s->s3->tmp.pms = pms;
s->s3->tmp.pmslen = pmslen;
return 1;
err:
EVP_PKEY_CTX_free(pkey_ctx);
OPENSSL_clear_free(pms, pmslen);
EVP_MD_CTX_free(ukm_hash);
return 0;
#else
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, ERR_R_INTERNAL_ERROR);
*al = SSL_AD_INTERNAL_ERROR;
return 0;
#endif
}
static int tls_construct_cke_srp(SSL *s, WPACKET *pkt, int *al)
{
#ifndef OPENSSL_NO_SRP
unsigned char *abytes = NULL;
if (s->srp_ctx.A == NULL
|| !WPACKET_sub_allocate_bytes_u16(pkt, BN_num_bytes(s->srp_ctx.A),
&abytes)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_SRP, ERR_R_INTERNAL_ERROR);
return 0;
}
BN_bn2bin(s->srp_ctx.A, abytes);
OPENSSL_free(s->session->srp_username);
s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login);
if (s->session->srp_username == NULL) {
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_SRP, ERR_R_MALLOC_FAILURE);
return 0;
}
return 1;
#else
SSLerr(SSL_F_TLS_CONSTRUCT_CKE_SRP, ERR_R_INTERNAL_ERROR);
*al = SSL_AD_INTERNAL_ERROR;
return 0;
#endif
}
int tls_construct_client_key_exchange(SSL *s, WPACKET *pkt)
{
unsigned long alg_k;
int al = -1;
alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
if ((alg_k & SSL_PSK)
&& !tls_construct_cke_psk_preamble(s, pkt, &al))
goto err;
if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) {
if (!tls_construct_cke_rsa(s, pkt, &al))
goto err;
} else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) {
if (!tls_construct_cke_dhe(s, pkt, &al))
goto err;
} else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) {
if (!tls_construct_cke_ecdhe(s, pkt, &al))
goto err;
} else if (alg_k & SSL_kGOST) {
if (!tls_construct_cke_gost(s, pkt, &al))
goto err;
} else if (alg_k & SSL_kSRP) {
if (!tls_construct_cke_srp(s, pkt, &al))
goto err;
} else if (!(alg_k & SSL_kPSK)) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
goto err;
}
return 1;
err:
if (al != -1)
ssl3_send_alert(s, SSL3_AL_FATAL, al);
OPENSSL_clear_free(s->s3->tmp.pms, s->s3->tmp.pmslen);
s->s3->tmp.pms = NULL;
#ifndef OPENSSL_NO_PSK
OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen);
s->s3->tmp.psk = NULL;
#endif
return 0;
}
int tls_client_key_exchange_post_work(SSL *s)
{
unsigned char *pms = NULL;
size_t pmslen = 0;
pms = s->s3->tmp.pms;
pmslen = s->s3->tmp.pmslen;
#ifndef OPENSSL_NO_SRP
/* Check for SRP */
if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) {
if (!srp_generate_client_master_secret(s)) {
SSLerr(SSL_F_TLS_CLIENT_KEY_EXCHANGE_POST_WORK,
ERR_R_INTERNAL_ERROR);
goto err;
}
return 1;
}
#endif
if (pms == NULL && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
SSLerr(SSL_F_TLS_CLIENT_KEY_EXCHANGE_POST_WORK, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!ssl_generate_master_secret(s, pms, pmslen, 1)) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
SSLerr(SSL_F_TLS_CLIENT_KEY_EXCHANGE_POST_WORK, ERR_R_INTERNAL_ERROR);
/* ssl_generate_master_secret frees the pms even on error */
pms = NULL;
pmslen = 0;
goto err;
}
pms = NULL;
pmslen = 0;
#ifndef OPENSSL_NO_SCTP
if (SSL_IS_DTLS(s)) {
unsigned char sctpauthkey[64];
char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
/*
* Add new shared key for SCTP-Auth, will be ignored if no SCTP
* used.
*/
memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
sizeof(DTLS1_SCTP_AUTH_LABEL));
if (SSL_export_keying_material(s, sctpauthkey,
sizeof(sctpauthkey), labelbuffer,
sizeof(labelbuffer), NULL, 0, 0) <= 0)
goto err;
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
sizeof(sctpauthkey), sctpauthkey);
}
#endif
return 1;
err:
OPENSSL_clear_free(pms, pmslen);
s->s3->tmp.pms = NULL;
return 0;
}
/*
* Check a certificate can be used for client authentication. Currently check
* cert exists, if we have a suitable digest for TLS 1.2 if static DH client
* certificates can be used and optionally checks suitability for Suite B.
*/
static int ssl3_check_client_certificate(SSL *s)
{
if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
return 0;
/* If no suitable signature algorithm can't use certificate */
if (SSL_USE_SIGALGS(s) && !s->s3->tmp.md[s->cert->key - s->cert->pkeys])
return 0;
/*
* If strict mode check suitability of chain before using it. This also
* adjusts suite B digest if necessary.
*/
if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
!tls1_check_chain(s, NULL, NULL, NULL, -2))
return 0;
return 1;
}
WORK_STATE tls_prepare_client_certificate(SSL *s, WORK_STATE wst)
{
X509 *x509 = NULL;
EVP_PKEY *pkey = NULL;
int i;
if (wst == WORK_MORE_A) {
/* Let cert callback update client certificates if required */
if (s->cert->cert_cb) {
i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
if (i < 0) {
s->rwstate = SSL_X509_LOOKUP;
return WORK_MORE_A;
}
if (i == 0) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
ossl_statem_set_error(s);
return 0;
}
s->rwstate = SSL_NOTHING;
}
if (ssl3_check_client_certificate(s))
return WORK_FINISHED_CONTINUE;
/* Fall through to WORK_MORE_B */
wst = WORK_MORE_B;
}
/* We need to get a client cert */
if (wst == WORK_MORE_B) {
/*
* If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
* return(-1); We then get retied later
*/
i = ssl_do_client_cert_cb(s, &x509, &pkey);
if (i < 0) {
s->rwstate = SSL_X509_LOOKUP;
return WORK_MORE_B;
}
s->rwstate = SSL_NOTHING;
if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
i = 0;
} else if (i == 1) {
i = 0;
SSLerr(SSL_F_TLS_PREPARE_CLIENT_CERTIFICATE,
SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
}
X509_free(x509);
EVP_PKEY_free(pkey);
if (i && !ssl3_check_client_certificate(s))
i = 0;
if (i == 0) {
if (s->version == SSL3_VERSION) {
s->s3->tmp.cert_req = 0;
ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
return WORK_FINISHED_CONTINUE;
} else {
s->s3->tmp.cert_req = 2;
if (!ssl3_digest_cached_records(s, 0)) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
ossl_statem_set_error(s);
return 0;
}
}
}
return WORK_FINISHED_CONTINUE;
}
/* Shouldn't ever get here */
return WORK_ERROR;
}
int tls_construct_client_certificate(SSL *s, WPACKET *pkt)
{
int al = SSL_AD_INTERNAL_ERROR;
/*
* TODO(TLS1.3): For now we must put an empty context. Needs to be filled in
* later
*/
if ((SSL_IS_TLS13(s) && !WPACKET_put_bytes_u8(pkt, 0))
|| !ssl3_output_cert_chain(s, pkt,
(s->s3->tmp.cert_req == 2) ? NULL
: s->cert->key,
&al)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
ssl3_send_alert(s, SSL3_AL_FATAL, al);
return 0;
}
return 1;
}
#define has_bits(i,m) (((i)&(m)) == (m))
int ssl3_check_cert_and_algorithm(SSL *s)
{
int i;
#ifndef OPENSSL_NO_EC
int idx;
#endif
long alg_k, alg_a;
EVP_PKEY *pkey = NULL;
int al = SSL_AD_HANDSHAKE_FAILURE;
alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
alg_a = s->s3->tmp.new_cipher->algorithm_auth;
/* we don't have a certificate */
if ((alg_a & SSL_aNULL) || (alg_k & SSL_kPSK))
return (1);
/* This is the passed certificate */
#ifndef OPENSSL_NO_EC
idx = s->session->peer_type;
if (idx == SSL_PKEY_ECC) {
if (ssl_check_srvr_ecc_cert_and_alg(s->session->peer, s) == 0) {
/* check failed */
SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_BAD_ECC_CERT);
goto f_err;
} else {
return 1;
}
} else if (alg_a & SSL_aECDSA) {
SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
SSL_R_MISSING_ECDSA_SIGNING_CERT);
goto f_err;
}
#endif
pkey = X509_get0_pubkey(s->session->peer);
i = X509_certificate_type(s->session->peer, pkey);
/* Check that we have a certificate if we require one */
if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA | EVP_PKT_SIGN)) {
SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
SSL_R_MISSING_RSA_SIGNING_CERT);
goto f_err;
}
#ifndef OPENSSL_NO_DSA
else if ((alg_a & SSL_aDSS) && !has_bits(i, EVP_PK_DSA | EVP_PKT_SIGN)) {
SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
SSL_R_MISSING_DSA_SIGNING_CERT);
goto f_err;
}
#endif
#ifndef OPENSSL_NO_RSA
if (alg_k & (SSL_kRSA | SSL_kRSAPSK) &&
!has_bits(i, EVP_PK_RSA | EVP_PKT_ENC)) {
SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
SSL_R_MISSING_RSA_ENCRYPTING_CERT);
goto f_err;
}
#endif
#ifndef OPENSSL_NO_DH
if ((alg_k & SSL_kDHE) && (s->s3->peer_tmp == NULL)) {
al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
goto f_err;
}
#endif
return (1);
f_err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
return (0);
}
#ifndef OPENSSL_NO_NEXTPROTONEG
int tls_construct_next_proto(SSL *s, WPACKET *pkt)
{
size_t len, padding_len;
unsigned char *padding = NULL;
len = s->ext.npn_len;
padding_len = 32 - ((len + 2) % 32);
if (!WPACKET_sub_memcpy_u8(pkt, s->ext.npn, len)
|| !WPACKET_sub_allocate_bytes_u8(pkt, padding_len, &padding)) {
SSLerr(SSL_F_TLS_CONSTRUCT_NEXT_PROTO, ERR_R_INTERNAL_ERROR);
goto err;
}
memset(padding, 0, padding_len);
return 1;
err:
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
return 0;
}
#endif
MSG_PROCESS_RETURN tls_process_hello_req(SSL *s, PACKET *pkt)
{
if (PACKET_remaining(pkt) > 0) {
/* should contain no data */
SSLerr(SSL_F_TLS_PROCESS_HELLO_REQ, SSL_R_LENGTH_MISMATCH);
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
ossl_statem_set_error(s);
return MSG_PROCESS_ERROR;
}
/*
* This is a historical discrepancy maintained for compatibility
* reasons. If a TLS client receives a HelloRequest it will attempt
* an abbreviated handshake. However if a DTLS client receives a
* HelloRequest it will do a full handshake.
*/
if (SSL_IS_DTLS(s))
SSL_renegotiate(s);
else
SSL_renegotiate_abbreviated(s);
return MSG_PROCESS_FINISHED_READING;
}
static MSG_PROCESS_RETURN tls_process_encrypted_extensions(SSL *s, PACKET *pkt)
{
int al = SSL_AD_INTERNAL_ERROR;
PACKET extensions;
RAW_EXTENSION *rawexts = NULL;
if (!PACKET_as_length_prefixed_2(pkt, &extensions)) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_TLS_PROCESS_ENCRYPTED_EXTENSIONS, SSL_R_LENGTH_MISMATCH);
goto err;
}
if (!tls_collect_extensions(s, &extensions, EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
&rawexts, &al)
|| !tls_parse_all_extensions(s, EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
rawexts, NULL, 0, &al))
goto err;
OPENSSL_free(rawexts);
return MSG_PROCESS_CONTINUE_READING;
err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
ossl_statem_set_error(s);
OPENSSL_free(rawexts);
return MSG_PROCESS_ERROR;
}
int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
{
int i = 0;
#ifndef OPENSSL_NO_ENGINE
if (s->ctx->client_cert_engine) {
i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
SSL_get_client_CA_list(s),
px509, ppkey, NULL, NULL, NULL);
if (i != 0)
return i;
}
#endif
if (s->ctx->client_cert_cb)
i = s->ctx->client_cert_cb(s, px509, ppkey);
return i;
}
int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk, WPACKET *pkt)
{
int i;
size_t totlen = 0, len, maxlen;
int empty_reneg_info_scsv = !s->renegotiate;
/* Set disabled masks for this session */
ssl_set_client_disabled(s);
if (sk == NULL)
return (0);
#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
# if OPENSSL_MAX_TLS1_2_CIPHER_LENGTH < 6
# error Max cipher length too short
# endif
/*
* Some servers hang if client hello > 256 bytes as hack workaround
* chop number of supported ciphers to keep it well below this if we
* use TLS v1.2
*/
if (TLS1_get_version(s) >= TLS1_2_VERSION)
maxlen = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
else
#endif
/* Maximum length that can be stored in 2 bytes. Length must be even */
maxlen = 0xfffe;
if (empty_reneg_info_scsv)
maxlen -= 2;
if (s->mode & SSL_MODE_SEND_FALLBACK_SCSV)
maxlen -= 2;
for (i = 0; i < sk_SSL_CIPHER_num(sk) && totlen < maxlen; i++) {
const SSL_CIPHER *c;
c = sk_SSL_CIPHER_value(sk, i);
/* Skip disabled ciphers */
if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_SUPPORTED))
continue;
if (!s->method->put_cipher_by_char(c, pkt, &len)) {
SSLerr(SSL_F_SSL_CIPHER_LIST_TO_BYTES, ERR_R_INTERNAL_ERROR);
return 0;
}
totlen += len;
}
if (totlen == 0) {
SSLerr(SSL_F_SSL_CIPHER_LIST_TO_BYTES, SSL_R_NO_CIPHERS_AVAILABLE);
return 0;
}
if (totlen != 0) {
if (empty_reneg_info_scsv) {
static SSL_CIPHER scsv = {
0, NULL, SSL3_CK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
if (!s->method->put_cipher_by_char(&scsv, pkt, &len)) {
SSLerr(SSL_F_SSL_CIPHER_LIST_TO_BYTES, ERR_R_INTERNAL_ERROR);
return 0;
}
}
if (s->mode & SSL_MODE_SEND_FALLBACK_SCSV) {
static SSL_CIPHER scsv = {
0, NULL, SSL3_CK_FALLBACK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
if (!s->method->put_cipher_by_char(&scsv, pkt, &len)) {
SSLerr(SSL_F_SSL_CIPHER_LIST_TO_BYTES, ERR_R_INTERNAL_ERROR);
return 0;
}
}
}
return 1;
}
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