A local copy of OpenSSL from GitHub
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/*
* Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
* Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
* Copyright 2005 Nokia. All rights reserved.
*
* Licensed under the Apache License 2.0 (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
*/
#include <stdio.h>
#include "../ssl_local.h"
#include "statem_local.h"
#include "internal/constant_time.h"
#include "internal/cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/dh.h>
#include <openssl/rsa.h>
#include <openssl/bn.h>
#include <openssl/md5.h>
#include <openssl/trace.h>
#include <openssl/core_names.h>
#include <openssl/asn1t.h>
#define TICKET_NONCE_SIZE 8
typedef struct {
ASN1_TYPE *kxBlob;
ASN1_TYPE *opaqueBlob;
} GOST_KX_MESSAGE;
DECLARE_ASN1_FUNCTIONS(GOST_KX_MESSAGE)
ASN1_SEQUENCE(GOST_KX_MESSAGE) = {
ASN1_SIMPLE(GOST_KX_MESSAGE, kxBlob, ASN1_ANY),
ASN1_OPT(GOST_KX_MESSAGE, opaqueBlob, ASN1_ANY),
} ASN1_SEQUENCE_END(GOST_KX_MESSAGE)
IMPLEMENT_ASN1_FUNCTIONS(GOST_KX_MESSAGE)
static int tls_construct_encrypted_extensions(SSL *s, WPACKET *pkt);
/*
* ossl_statem_server13_read_transition() encapsulates the logic for the allowed
* handshake state transitions when a TLSv1.3 server is reading messages from
* the client. The message type that the client 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_server13_read_transition(SSL *s, int mt)
{
OSSL_STATEM *st = &s->statem;
/*
* Note: There is no case for TLS_ST_BEFORE because at that stage we have
* not negotiated TLSv1.3 yet, so that case is handled by
* ossl_statem_server_read_transition()
*/
switch (st->hand_state) {
default:
break;
case TLS_ST_EARLY_DATA:
if (s->hello_retry_request == SSL_HRR_PENDING) {
if (mt == SSL3_MT_CLIENT_HELLO) {
st->hand_state = TLS_ST_SR_CLNT_HELLO;
return 1;
}
break;
} else if (s->ext.early_data == SSL_EARLY_DATA_ACCEPTED) {
if (mt == SSL3_MT_END_OF_EARLY_DATA) {
st->hand_state = TLS_ST_SR_END_OF_EARLY_DATA;
return 1;
}
break;
}
/* Fall through */
case TLS_ST_SR_END_OF_EARLY_DATA:
case TLS_ST_SW_FINISHED:
if (s->s3.tmp.cert_request) {
if (mt == SSL3_MT_CERTIFICATE) {
st->hand_state = TLS_ST_SR_CERT;
return 1;
}
} else {
if (mt == SSL3_MT_FINISHED) {
st->hand_state = TLS_ST_SR_FINISHED;
return 1;
}
}
break;
case TLS_ST_SR_CERT:
if (s->session->peer == NULL) {
if (mt == SSL3_MT_FINISHED) {
st->hand_state = TLS_ST_SR_FINISHED;
return 1;
}
} else {
if (mt == SSL3_MT_CERTIFICATE_VERIFY) {
st->hand_state = TLS_ST_SR_CERT_VRFY;
return 1;
}
}
break;
case TLS_ST_SR_CERT_VRFY:
if (mt == SSL3_MT_FINISHED) {
st->hand_state = TLS_ST_SR_FINISHED;
return 1;
}
break;
case TLS_ST_OK:
/*
* Its never ok to start processing handshake messages in the middle of
* early data (i.e. before we've received the end of early data alert)
*/
if (s->early_data_state == SSL_EARLY_DATA_READING)
break;
if (mt == SSL3_MT_CERTIFICATE
&& s->post_handshake_auth == SSL_PHA_REQUESTED) {
st->hand_state = TLS_ST_SR_CERT;
return 1;
}
if (mt == SSL3_MT_KEY_UPDATE) {
st->hand_state = TLS_ST_SR_KEY_UPDATE;
return 1;
}
break;
}
/* No valid transition found */
return 0;
}
/*
* ossl_statem_server_read_transition() encapsulates the logic for the allowed
* handshake state transitions when the server is reading messages from the
* client. The message type that the client 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_server_read_transition(SSL *s, int mt)
{
OSSL_STATEM *st = &s->statem;
if (SSL_IS_TLS13(s)) {
if (!ossl_statem_server13_read_transition(s, mt))
goto err;
return 1;
}
switch (st->hand_state) {
default:
break;
case TLS_ST_BEFORE:
case TLS_ST_OK:
case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
if (mt == SSL3_MT_CLIENT_HELLO) {
st->hand_state = TLS_ST_SR_CLNT_HELLO;
return 1;
}
break;
case TLS_ST_SW_SRVR_DONE:
/*
* If we get a CKE message after a ServerDone then either
* 1) We didn't request a Certificate
* OR
* 2) If we did request one then
* a) We allow no Certificate to be returned
* AND
* b) We are running SSL3 (in TLS1.0+ the client must return a 0
* list if we requested a certificate)
*/
if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) {
if (s->s3.tmp.cert_request) {
if (s->version == SSL3_VERSION) {
if ((s->verify_mode & SSL_VERIFY_PEER)
&& (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
/*
* This isn't an unexpected message as such - we're just
* not going to accept it because we require a client
* cert.
*/
SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
return 0;
}
st->hand_state = TLS_ST_SR_KEY_EXCH;
return 1;
}
} else {
st->hand_state = TLS_ST_SR_KEY_EXCH;
return 1;
}
} else if (s->s3.tmp.cert_request) {
if (mt == SSL3_MT_CERTIFICATE) {
st->hand_state = TLS_ST_SR_CERT;
return 1;
}
}
break;
case TLS_ST_SR_CERT:
if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) {
st->hand_state = TLS_ST_SR_KEY_EXCH;
return 1;
}
break;
case TLS_ST_SR_KEY_EXCH:
/*
* We should only process a CertificateVerify message if we have
* received a Certificate from the client. If so then |s->session->peer|
* will be non NULL. In some instances a CertificateVerify message is
* not required even if the peer has sent a Certificate (e.g. such as in
* the case of static DH). In that case |st->no_cert_verify| should be
* set.
*/
if (s->session->peer == NULL || st->no_cert_verify) {
if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
/*
* 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.
*/
st->hand_state = TLS_ST_SR_CHANGE;
return 1;
}
} else {
if (mt == SSL3_MT_CERTIFICATE_VERIFY) {
st->hand_state = TLS_ST_SR_CERT_VRFY;
return 1;
}
}
break;
case TLS_ST_SR_CERT_VRFY:
if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
st->hand_state = TLS_ST_SR_CHANGE;
return 1;
}
break;
case TLS_ST_SR_CHANGE:
#ifndef OPENSSL_NO_NEXTPROTONEG
if (s->s3.npn_seen) {
if (mt == SSL3_MT_NEXT_PROTO) {
st->hand_state = TLS_ST_SR_NEXT_PROTO;
return 1;
}
} else {
#endif
if (mt == SSL3_MT_FINISHED) {
st->hand_state = TLS_ST_SR_FINISHED;
return 1;
}
#ifndef OPENSSL_NO_NEXTPROTONEG
}
#endif
break;
#ifndef OPENSSL_NO_NEXTPROTONEG
case TLS_ST_SR_NEXT_PROTO:
if (mt == SSL3_MT_FINISHED) {
st->hand_state = TLS_ST_SR_FINISHED;
return 1;
}
break;
#endif
case TLS_ST_SW_FINISHED:
if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
st->hand_state = TLS_ST_SR_CHANGE;
return 1;
}
break;
}
err:
/* No valid transition found */
if (SSL_IS_DTLS(s) && mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
BIO *rbio;
/*
* CCS messages don't have a message sequence number so this is probably
* because of an out-of-order CCS. We'll just drop it.
*/
s->init_num = 0;
s->rwstate = SSL_READING;
rbio = SSL_get_rbio(s);
BIO_clear_retry_flags(rbio);
BIO_set_retry_read(rbio);
return 0;
}
SSLfatal(s, SSL3_AD_UNEXPECTED_MESSAGE, SSL_R_UNEXPECTED_MESSAGE);
return 0;
}
/*
* Should we send a ServerKeyExchange message?
*
* Valid return values are:
* 1: Yes
* 0: No
*/
static int send_server_key_exchange(SSL *s)
{
unsigned long alg_k = s->s3.tmp.new_cipher->algorithm_mkey;
/*
* only send a ServerKeyExchange if DH or fortezza but we have a
* sign only certificate PSK: may send PSK identity hints For
* ECC ciphersuites, we send a serverKeyExchange message only if
* the cipher suite is either ECDH-anon or ECDHE. In other cases,
* the server certificate contains the server's public key for
* key exchange.
*/
if (alg_k & (SSL_kDHE | SSL_kECDHE)
/*
* PSK: send ServerKeyExchange if PSK identity hint if
* provided
*/
#ifndef OPENSSL_NO_PSK
/* Only send SKE if we have identity hint for plain PSK */
|| ((alg_k & (SSL_kPSK | SSL_kRSAPSK))
&& s->cert->psk_identity_hint)
/* For other PSK always send SKE */
|| (alg_k & (SSL_PSK & (SSL_kDHEPSK | SSL_kECDHEPSK)))
#endif
#ifndef OPENSSL_NO_SRP
/* SRP: send ServerKeyExchange */
|| (alg_k & SSL_kSRP)
#endif
) {
return 1;
}
return 0;
}
/*
* Should we send a CertificateRequest message?
*
* Valid return values are:
* 1: Yes
* 0: No
*/
int send_certificate_request(SSL *s)
{
if (
/* don't request cert unless asked for it: */
s->verify_mode & SSL_VERIFY_PEER
/*
* don't request if post-handshake-only unless doing
* post-handshake in TLSv1.3:
*/
&& (!SSL_IS_TLS13(s) || !(s->verify_mode & SSL_VERIFY_POST_HANDSHAKE)
|| s->post_handshake_auth == SSL_PHA_REQUEST_PENDING)
/*
* if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
* a second time:
*/
&& (s->certreqs_sent < 1 ||
!(s->verify_mode & SSL_VERIFY_CLIENT_ONCE))
/*
* never request cert in anonymous ciphersuites (see
* section "Certificate request" in SSL 3 drafts and in
* RFC 2246):
*/
&& (!(s->s3.tmp.new_cipher->algorithm_auth & SSL_aNULL)
/*
* ... except when the application insists on
* verification (against the specs, but statem_clnt.c accepts
* this for SSL 3)
*/
|| (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
/* don't request certificate for SRP auth */
&& !(s->s3.tmp.new_cipher->algorithm_auth & SSL_aSRP)
/*
* With normal PSK Certificates and Certificate Requests
* are omitted
*/
&& !(s->s3.tmp.new_cipher->algorithm_auth & SSL_aPSK)) {
return 1;
}
return 0;
}
/*
* ossl_statem_server13_write_transition() works out what handshake state to
* move to next when a TLSv1.3 server is writing messages to be sent to the
* client.
*/
static WRITE_TRAN ossl_statem_server13_write_transition(SSL *s)
{
OSSL_STATEM *st = &s->statem;
/*
* No case for TLS_ST_BEFORE, because at that stage we have not negotiated
* TLSv1.3 yet, so that is handled by ossl_statem_server_write_transition()
*/
switch (st->hand_state) {
default:
/* Shouldn't happen */
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return WRITE_TRAN_ERROR;
case TLS_ST_OK:
if (s->key_update != SSL_KEY_UPDATE_NONE) {
st->hand_state = TLS_ST_SW_KEY_UPDATE;
return WRITE_TRAN_CONTINUE;
}
if (s->post_handshake_auth == SSL_PHA_REQUEST_PENDING) {
st->hand_state = TLS_ST_SW_CERT_REQ;
return WRITE_TRAN_CONTINUE;
}
if (s->ext.extra_tickets_expected > 0) {
st->hand_state = TLS_ST_SW_SESSION_TICKET;
return WRITE_TRAN_CONTINUE;
}
/* Try to read from the client instead */
return WRITE_TRAN_FINISHED;
case TLS_ST_SR_CLNT_HELLO:
st->hand_state = TLS_ST_SW_SRVR_HELLO;
return WRITE_TRAN_CONTINUE;
case TLS_ST_SW_SRVR_HELLO:
if ((s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) != 0
&& s->hello_retry_request != SSL_HRR_COMPLETE)
st->hand_state = TLS_ST_SW_CHANGE;
else if (s->hello_retry_request == SSL_HRR_PENDING)
st->hand_state = TLS_ST_EARLY_DATA;
else
st->hand_state = TLS_ST_SW_ENCRYPTED_EXTENSIONS;
return WRITE_TRAN_CONTINUE;
case TLS_ST_SW_CHANGE:
if (s->hello_retry_request == SSL_HRR_PENDING)
st->hand_state = TLS_ST_EARLY_DATA;
else
st->hand_state = TLS_ST_SW_ENCRYPTED_EXTENSIONS;
return WRITE_TRAN_CONTINUE;
case TLS_ST_SW_ENCRYPTED_EXTENSIONS:
if (s->hit)
st->hand_state = TLS_ST_SW_FINISHED;
else if (send_certificate_request(s))
st->hand_state = TLS_ST_SW_CERT_REQ;
else
st->hand_state = TLS_ST_SW_CERT;
return WRITE_TRAN_CONTINUE;
case TLS_ST_SW_CERT_REQ:
if (s->post_handshake_auth == SSL_PHA_REQUEST_PENDING) {
s->post_handshake_auth = SSL_PHA_REQUESTED;
st->hand_state = TLS_ST_OK;
} else {
st->hand_state = TLS_ST_SW_CERT;
}
return WRITE_TRAN_CONTINUE;
case TLS_ST_SW_CERT:
st->hand_state = TLS_ST_SW_CERT_VRFY;
return WRITE_TRAN_CONTINUE;
case TLS_ST_SW_CERT_VRFY:
st->hand_state = TLS_ST_SW_FINISHED;
return WRITE_TRAN_CONTINUE;
case TLS_ST_SW_FINISHED:
st->hand_state = TLS_ST_EARLY_DATA;
return WRITE_TRAN_CONTINUE;
case TLS_ST_EARLY_DATA:
return WRITE_TRAN_FINISHED;
case TLS_ST_SR_FINISHED:
/*
* Technically we have finished the handshake at this point, but we're
* going to remain "in_init" for now and write out any session tickets
* immediately.
*/
if (s->post_handshake_auth == SSL_PHA_REQUESTED) {
s->post_handshake_auth = SSL_PHA_EXT_RECEIVED;
} else if (!s->ext.ticket_expected) {
/*
* If we're not going to renew the ticket then we just finish the
* handshake at this point.
*/
st->hand_state = TLS_ST_OK;
return WRITE_TRAN_CONTINUE;
}
if (s->num_tickets > s->sent_tickets)
st->hand_state = TLS_ST_SW_SESSION_TICKET;
else
st->hand_state = TLS_ST_OK;
return WRITE_TRAN_CONTINUE;
case TLS_ST_SR_KEY_UPDATE:
case TLS_ST_SW_KEY_UPDATE:
st->hand_state = TLS_ST_OK;
return WRITE_TRAN_CONTINUE;
case TLS_ST_SW_SESSION_TICKET:
/* In a resumption we only ever send a maximum of one new ticket.
* Following an initial handshake we send the number of tickets we have
* been configured for.
*/
if (!SSL_IS_FIRST_HANDSHAKE(s) && s->ext.extra_tickets_expected > 0) {
return WRITE_TRAN_CONTINUE;
} else if (s->hit || s->num_tickets <= s->sent_tickets) {
/* We've written enough tickets out. */
st->hand_state = TLS_ST_OK;
}
return WRITE_TRAN_CONTINUE;
}
}
/*
* ossl_statem_server_write_transition() works out what handshake state to move
* to next when the server is writing messages to be sent to the client.
*/
WRITE_TRAN ossl_statem_server_write_transition(SSL *s)
{
OSSL_STATEM *st = &s->statem;
/*
* Note that before the 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_server13_write_transition(s);
switch (st->hand_state) {
default:
/* Shouldn't happen */
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return WRITE_TRAN_ERROR;
case TLS_ST_OK:
if (st->request_state == TLS_ST_SW_HELLO_REQ) {
/* We must be trying to renegotiate */
st->hand_state = TLS_ST_SW_HELLO_REQ;
st->request_state = TLS_ST_BEFORE;
return WRITE_TRAN_CONTINUE;
}
/* Must be an incoming ClientHello */
if (!tls_setup_handshake(s)) {
/* SSLfatal() already called */
return WRITE_TRAN_ERROR;
}
/* Fall through */
case TLS_ST_BEFORE:
/* Just go straight to trying to read from the client */
return WRITE_TRAN_FINISHED;
case TLS_ST_SW_HELLO_REQ:
st->hand_state = TLS_ST_OK;
return WRITE_TRAN_CONTINUE;
case TLS_ST_SR_CLNT_HELLO:
if (SSL_IS_DTLS(s) && !s->d1->cookie_verified
&& (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) {
st->hand_state = DTLS_ST_SW_HELLO_VERIFY_REQUEST;
} else if (s->renegotiate == 0 && !SSL_IS_FIRST_HANDSHAKE(s)) {
/* We must have rejected the renegotiation */
st->hand_state = TLS_ST_OK;
return WRITE_TRAN_CONTINUE;
} else {
st->hand_state = TLS_ST_SW_SRVR_HELLO;
}
return WRITE_TRAN_CONTINUE;
case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
return WRITE_TRAN_FINISHED;
case TLS_ST_SW_SRVR_HELLO:
if (s->hit) {
if (s->ext.ticket_expected)
st->hand_state = TLS_ST_SW_SESSION_TICKET;
else
st->hand_state = TLS_ST_SW_CHANGE;
} else {
/* Check if it is anon DH or anon ECDH, */
/* normal PSK or SRP */
if (!(s->s3.tmp.new_cipher->algorithm_auth &
(SSL_aNULL | SSL_aSRP | SSL_aPSK))) {
st->hand_state = TLS_ST_SW_CERT;
} else if (send_server_key_exchange(s)) {
st->hand_state = TLS_ST_SW_KEY_EXCH;
} else if (send_certificate_request(s)) {
st->hand_state = TLS_ST_SW_CERT_REQ;
} else {
st->hand_state = TLS_ST_SW_SRVR_DONE;
}
}
return WRITE_TRAN_CONTINUE;
case TLS_ST_SW_CERT:
if (s->ext.status_expected) {
st->hand_state = TLS_ST_SW_CERT_STATUS;
return WRITE_TRAN_CONTINUE;
}
/* Fall through */
case TLS_ST_SW_CERT_STATUS:
if (send_server_key_exchange(s)) {
st->hand_state = TLS_ST_SW_KEY_EXCH;
return WRITE_TRAN_CONTINUE;
}
/* Fall through */
case TLS_ST_SW_KEY_EXCH:
if (send_certificate_request(s)) {
st->hand_state = TLS_ST_SW_CERT_REQ;
return WRITE_TRAN_CONTINUE;
}
/* Fall through */
case TLS_ST_SW_CERT_REQ:
st->hand_state = TLS_ST_SW_SRVR_DONE;
return WRITE_TRAN_CONTINUE;
case TLS_ST_SW_SRVR_DONE:
return WRITE_TRAN_FINISHED;
case TLS_ST_SR_FINISHED:
if (s->hit) {
st->hand_state = TLS_ST_OK;
return WRITE_TRAN_CONTINUE;
} else if (s->ext.ticket_expected) {
st->hand_state = TLS_ST_SW_SESSION_TICKET;
} else {
st->hand_state = TLS_ST_SW_CHANGE;
}
return WRITE_TRAN_CONTINUE;
case TLS_ST_SW_SESSION_TICKET:
st->hand_state = TLS_ST_SW_CHANGE;
return WRITE_TRAN_CONTINUE;
case TLS_ST_SW_CHANGE:
st->hand_state = TLS_ST_SW_FINISHED;
return WRITE_TRAN_CONTINUE;
case TLS_ST_SW_FINISHED:
if (s->hit) {
return WRITE_TRAN_FINISHED;
}
st->hand_state = TLS_ST_OK;
return WRITE_TRAN_CONTINUE;
}
}
/*
* Perform any pre work that needs to be done prior to sending a message from
* the server to the client.
*/
WORK_STATE ossl_statem_server_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_SW_HELLO_REQ:
s->shutdown = 0;
if (SSL_IS_DTLS(s))
dtls1_clear_sent_buffer(s);
break;
case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
s->shutdown = 0;
if (SSL_IS_DTLS(s)) {
dtls1_clear_sent_buffer(s);
/* We don't buffer this message so don't use the timer */
st->use_timer = 0;
}
break;
case TLS_ST_SW_SRVR_HELLO:
if (SSL_IS_DTLS(s)) {
/*
* Messages we write from now on should be buffered and
* retransmitted if necessary, so we need to use the timer now
*/
st->use_timer = 1;
}
break;
case TLS_ST_SW_SRVR_DONE:
#ifndef OPENSSL_NO_SCTP
if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))) {
/* Calls SSLfatal() as required */
return dtls_wait_for_dry(s);
}
#endif
return WORK_FINISHED_CONTINUE;
case TLS_ST_SW_SESSION_TICKET:
if (SSL_IS_TLS13(s) && s->sent_tickets == 0
&& s->ext.extra_tickets_expected == 0) {
/*
* Actually this is the end of the handshake, but we're going
* straight into writing the session ticket out. So we finish off
* the handshake, but keep the various buffers active.
*
* Calls SSLfatal as required.
*/
return tls_finish_handshake(s, wst, 0, 0);
}
if (SSL_IS_DTLS(s)) {
/*
* We're into the last flight. We don't retransmit the last flight
* unless we need to, so we don't use the timer
*/
st->use_timer = 0;
}
break;
case TLS_ST_SW_CHANGE:
if (SSL_IS_TLS13(s))
break;
/* Writes to s->session are only safe for initial handshakes */
if (s->session->cipher == NULL) {
s->session->cipher = s->s3.tmp.new_cipher;
} else if (s->session->cipher != s->s3.tmp.new_cipher) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return WORK_ERROR;
}
if (!s->method->ssl3_enc->setup_key_block(s)) {
/* SSLfatal() already called */
return WORK_ERROR;
}
if (SSL_IS_DTLS(s)) {
/*
* We're into the last flight. We don't retransmit the last flight
* unless we need to, so we don't use the timer. This might have
* already been set to 0 if we sent a NewSessionTicket message,
* but we'll set it again here in case we didn't.
*/
st->use_timer = 0;
}
return WORK_FINISHED_CONTINUE;
case TLS_ST_EARLY_DATA:
if (s->early_data_state != SSL_EARLY_DATA_ACCEPTING
&& (s->s3.flags & TLS1_FLAGS_STATELESS) == 0)
return WORK_FINISHED_CONTINUE;
/* Fall through */
case TLS_ST_OK:
/* Calls SSLfatal() as required */
return tls_finish_handshake(s, wst, 1, 1);
}
return WORK_FINISHED_CONTINUE;
}
static ossl_inline int conn_is_closed(void)
{
switch (get_last_sys_error()) {
#if defined(EPIPE)
case EPIPE:
return 1;
#endif
#if defined(ECONNRESET)
case ECONNRESET:
return 1;
#endif
#if defined(WSAECONNRESET)
case WSAECONNRESET:
return 1;
#endif
default:
return 0;
}
}
/*
* Perform any work that needs to be done after sending a message from the
* server to the client.
*/
WORK_STATE ossl_statem_server_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_SW_HELLO_REQ:
if (statem_flush(s) != 1)
return WORK_MORE_A;
if (!ssl3_init_finished_mac(s)) {
/* SSLfatal() already called */
return WORK_ERROR;
}
break;
case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
if (statem_flush(s) != 1)
return WORK_MORE_A;
/* HelloVerifyRequest resets Finished MAC */
if (s->version != DTLS1_BAD_VER && !ssl3_init_finished_mac(s)) {
/* SSLfatal() already called */
return WORK_ERROR;
}
/*
* The next message should be another ClientHello which we need to
* treat like it was the first packet
*/
s->first_packet = 1;
break;
case TLS_ST_SW_SRVR_HELLO:
if (SSL_IS_TLS13(s) && s->hello_retry_request == SSL_HRR_PENDING) {
if ((s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) == 0
&& statem_flush(s) != 1)
return WORK_MORE_A;
break;
}
#ifndef OPENSSL_NO_SCTP
if (SSL_IS_DTLS(s) && s->hit) {
unsigned char sctpauthkey[64];
char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
size_t labellen;
/*
* 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));
/* Don't include the terminating zero. */
labellen = sizeof(labelbuffer) - 1;
if (s->mode & SSL_MODE_DTLS_SCTP_LABEL_LENGTH_BUG)
labellen += 1;
if (SSL_export_keying_material(s, sctpauthkey,
sizeof(sctpauthkey), labelbuffer,
labellen, NULL, 0,
0) <= 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return WORK_ERROR;
}
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
sizeof(sctpauthkey), sctpauthkey);
}
#endif
if (!SSL_IS_TLS13(s)
|| ((s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) != 0
&& s->hello_retry_request != SSL_HRR_COMPLETE))
break;
/* Fall through */
case TLS_ST_SW_CHANGE:
if (s->hello_retry_request == SSL_HRR_PENDING) {
if (!statem_flush(s))
return WORK_MORE_A;
break;
}
if (SSL_IS_TLS13(s)) {
if (!s->method->ssl3_enc->setup_key_block(s)
|| !s->method->ssl3_enc->change_cipher_state(s,
SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_SERVER_WRITE)) {
/* SSLfatal() already called */
return WORK_ERROR;
}
if (s->ext.early_data != SSL_EARLY_DATA_ACCEPTED
&& !s->method->ssl3_enc->change_cipher_state(s,
SSL3_CC_HANDSHAKE |SSL3_CHANGE_CIPHER_SERVER_READ)) {
/* SSLfatal() already called */
return WORK_ERROR;
}
/*
* We don't yet know whether the next record we are going to receive
* is an unencrypted alert, an encrypted alert, or an encrypted
* handshake message. We temporarily tolerate unencrypted alerts.
*/
s->statem.enc_read_state = ENC_READ_STATE_ALLOW_PLAIN_ALERTS;
break;
}
#ifndef OPENSSL_NO_SCTP
if (SSL_IS_DTLS(s) && !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
if (!s->method->ssl3_enc->change_cipher_state(s,
SSL3_CHANGE_CIPHER_SERVER_WRITE))
{
/* SSLfatal() already called */
return WORK_ERROR;
}
if (SSL_IS_DTLS(s))
dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
break;
case TLS_ST_SW_SRVR_DONE:
if (statem_flush(s) != 1)
return WORK_MORE_A;
break;
case TLS_ST_SW_FINISHED:
if (statem_flush(s) != 1)
return WORK_MORE_A;
#ifndef OPENSSL_NO_SCTP
if (SSL_IS_DTLS(s) && 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
if (SSL_IS_TLS13(s)) {
/* TLS 1.3 gets the secret size from the handshake md */
size_t dummy;
if (!s->method->ssl3_enc->generate_master_secret(s,
s->master_secret, s->handshake_secret, 0,
&dummy)
|| !s->method->ssl3_enc->change_cipher_state(s,
SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_SERVER_WRITE))
/* SSLfatal() already called */
return WORK_ERROR;
}
break;
case TLS_ST_SW_CERT_REQ:
if (s->post_handshake_auth == SSL_PHA_REQUEST_PENDING) {
if (statem_flush(s) != 1)
return WORK_MORE_A;
}
break;
case TLS_ST_SW_KEY_UPDATE:
if (statem_flush(s) != 1)
return WORK_MORE_A;
if (!tls13_update_key(s, 1)) {
/* SSLfatal() already called */
return WORK_ERROR;
}
break;
case TLS_ST_SW_SESSION_TICKET:
clear_sys_error();
if (SSL_IS_TLS13(s) && statem_flush(s) != 1) {
if (SSL_get_error(s, 0) == SSL_ERROR_SYSCALL
&& conn_is_closed()) {
/*
* We ignore connection closed errors in TLSv1.3 when sending a
* NewSessionTicket and behave as if we were successful. This is
* so that we are still able to read data sent to us by a client
* that closes soon after the end of the handshake without
* waiting to read our post-handshake NewSessionTickets.
*/
s->rwstate = SSL_NOTHING;
break;
}
return WORK_MORE_A;
}
break;
}
return WORK_FINISHED_CONTINUE;
}
/*
* Get the message construction function and message type for sending from the
* server
*
* Valid return values are:
* 1: Success
* 0: Error
*/
int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt,
confunc_f *confunc, int *mt)
{
OSSL_STATEM *st = &s->statem;
switch (st->hand_state) {
default:
/* Shouldn't happen */
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_STATE);
return 0;
case TLS_ST_SW_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 DTLS_ST_SW_HELLO_VERIFY_REQUEST:
*confunc = dtls_construct_hello_verify_request;
*mt = DTLS1_MT_HELLO_VERIFY_REQUEST;
break;
case TLS_ST_SW_HELLO_REQ:
/* No construction function needed */
*confunc = NULL;
*mt = SSL3_MT_HELLO_REQUEST;
break;
case TLS_ST_SW_SRVR_HELLO:
*confunc = tls_construct_server_hello;
*mt = SSL3_MT_SERVER_HELLO;
break;
case TLS_ST_SW_CERT:
*confunc = tls_construct_server_certificate;
*mt = SSL3_MT_CERTIFICATE;
break;
case TLS_ST_SW_CERT_VRFY:
*confunc = tls_construct_cert_verify;
*mt = SSL3_MT_CERTIFICATE_VERIFY;
break;
case TLS_ST_SW_KEY_EXCH:
*confunc = tls_construct_server_key_exchange;
*mt = SSL3_MT_SERVER_KEY_EXCHANGE;
break;
case TLS_ST_SW_CERT_REQ:
*confunc = tls_construct_certificate_request;
*mt = SSL3_MT_CERTIFICATE_REQUEST;
break;
case TLS_ST_SW_SRVR_DONE:
*confunc = tls_construct_server_done;
*mt = SSL3_MT_SERVER_DONE;
break;
case TLS_ST_SW_SESSION_TICKET:
*confunc = tls_construct_new_session_ticket;
*mt = SSL3_MT_NEWSESSION_TICKET;
break;
case TLS_ST_SW_CERT_STATUS:
*confunc = tls_construct_cert_status;
*mt = SSL3_MT_CERTIFICATE_STATUS;
break;
case TLS_ST_SW_FINISHED:
*confunc = tls_construct_finished;
*mt = SSL3_MT_FINISHED;
break;
case TLS_ST_EARLY_DATA:
*confunc = NULL;
*mt = SSL3_MT_DUMMY;
break;
case TLS_ST_SW_ENCRYPTED_EXTENSIONS:
*confunc = tls_construct_encrypted_extensions;
*mt = SSL3_MT_ENCRYPTED_EXTENSIONS;
break;
case TLS_ST_SW_KEY_UPDATE:
*confunc = tls_construct_key_update;
*mt = SSL3_MT_KEY_UPDATE;
break;
}
return 1;
}
/*
* Maximum size (excluding the Handshake header) of a ClientHello message,
* calculated as follows:
*
* 2 + # client_version
* 32 + # only valid length for random
* 1 + # length of session_id
* 32 + # maximum size for session_id
* 2 + # length of cipher suites
* 2^16-2 + # maximum length of cipher suites array
* 1 + # length of compression_methods
* 2^8-1 + # maximum length of compression methods
* 2 + # length of extensions
* 2^16-1 # maximum length of extensions
*/
#define CLIENT_HELLO_MAX_LENGTH 131396
#define CLIENT_KEY_EXCH_MAX_LENGTH 2048
#define NEXT_PROTO_MAX_LENGTH 514
/*
* Returns the maximum allowed length for the current message that we are
* reading. Excludes the message header.
*/
size_t ossl_statem_server_max_message_size(SSL *s)
{
OSSL_STATEM *st = &s->statem;
switch (st->hand_state) {
default:
/* Shouldn't happen */
return 0;
case TLS_ST_SR_CLNT_HELLO:
return CLIENT_HELLO_MAX_LENGTH;
case TLS_ST_SR_END_OF_EARLY_DATA:
return END_OF_EARLY_DATA_MAX_LENGTH;
case TLS_ST_SR_CERT:
return s->max_cert_list;
case TLS_ST_SR_KEY_EXCH:
return CLIENT_KEY_EXCH_MAX_LENGTH;
case TLS_ST_SR_CERT_VRFY:
return SSL3_RT_MAX_PLAIN_LENGTH;
#ifndef OPENSSL_NO_NEXTPROTONEG
case TLS_ST_SR_NEXT_PROTO:
return NEXT_PROTO_MAX_LENGTH;
#endif
case TLS_ST_SR_CHANGE:
return CCS_MAX_LENGTH;
case TLS_ST_SR_FINISHED:
return FINISHED_MAX_LENGTH;
case TLS_ST_SR_KEY_UPDATE:
return KEY_UPDATE_MAX_LENGTH;
}
}
/*
* Process a message that the server has received from the client.
*/
MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt)
{
OSSL_STATEM *st = &s->statem;
switch (st->hand_state) {
default:
/* Shouldn't happen */
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return MSG_PROCESS_ERROR;
case TLS_ST_SR_CLNT_HELLO:
return tls_process_client_hello(s, pkt);
case TLS_ST_SR_END_OF_EARLY_DATA:
return tls_process_end_of_early_data(s, pkt);
case TLS_ST_SR_CERT:
return tls_process_client_certificate(s, pkt);
case TLS_ST_SR_KEY_EXCH:
return tls_process_client_key_exchange(s, pkt);
case TLS_ST_SR_CERT_VRFY:
return tls_process_cert_verify(s, pkt);
#ifndef OPENSSL_NO_NEXTPROTONEG
case TLS_ST_SR_NEXT_PROTO:
return tls_process_next_proto(s, pkt);
#endif
case TLS_ST_SR_CHANGE:
return tls_process_change_cipher_spec(s, pkt);
case TLS_ST_SR_FINISHED:
return tls_process_finished(s, pkt);
case TLS_ST_SR_KEY_UPDATE:
return tls_process_key_update(s, pkt);
}
}
/*
* Perform any further processing required following the receipt of a message
* from the client
*/
WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst)
{
OSSL_STATEM *st = &s->statem;
switch (st->hand_state) {
default:
/* Shouldn't happen */
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return WORK_ERROR;
case TLS_ST_SR_CLNT_HELLO:
return tls_post_process_client_hello(s, wst);
case TLS_ST_SR_KEY_EXCH:
return tls_post_process_client_key_exchange(s, wst);
}
}
#ifndef OPENSSL_NO_SRP
/* Returns 1 on success, 0 for retryable error, -1 for fatal error */
static int ssl_check_srp_ext_ClientHello(SSL *s)
{
int ret;
int al = SSL_AD_UNRECOGNIZED_NAME;
if ((s->s3.tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
(s->srp_ctx.TLS_ext_srp_username_callback != NULL)) {
if (s->srp_ctx.login == NULL) {
/*
* RFC 5054 says SHOULD reject, we do so if There is no srp
* login name
*/
SSLfatal(s, SSL_AD_UNKNOWN_PSK_IDENTITY,
SSL_R_PSK_IDENTITY_NOT_FOUND);
return -1;
} else {
ret = ssl_srp_server_param_with_username_intern(s, &al);
if (ret < 0)
return 0;
if (ret == SSL3_AL_FATAL) {
SSLfatal(s, al,
al == SSL_AD_UNKNOWN_PSK_IDENTITY
? SSL_R_PSK_IDENTITY_NOT_FOUND
: SSL_R_CLIENTHELLO_TLSEXT);
return -1;
}
}
}
return 1;
}
#endif
int dtls_raw_hello_verify_request(WPACKET *pkt, unsigned char *cookie,
size_t cookie_len)
{
/* Always use DTLS 1.0 version: see RFC 6347 */
if (!WPACKET_put_bytes_u16(pkt, DTLS1_VERSION)
|| !WPACKET_sub_memcpy_u8(pkt, cookie, cookie_len))
return 0;
return 1;
}
int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt)
{
unsigned int cookie_leni;
if (s->ctx->app_gen_cookie_cb == NULL ||
s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
&cookie_leni) == 0 ||
cookie_leni > DTLS1_COOKIE_LENGTH) {
SSLfatal(s, SSL_AD_NO_ALERT, SSL_R_COOKIE_GEN_CALLBACK_FAILURE);
return 0;
}
s->d1->cookie_len = cookie_leni;
if (!dtls_raw_hello_verify_request(pkt, s->d1->cookie,
s->d1->cookie_len)) {
SSLfatal(s, SSL_AD_NO_ALERT, ERR_R_INTERNAL_ERROR);
return 0;
}
return 1;
}
/*-
* ssl_check_for_safari attempts to fingerprint Safari using OS X
* SecureTransport using the TLS extension block in |hello|.
* Safari, since 10.6, sends exactly these extensions, in this order:
* SNI,
* elliptic_curves
* ec_point_formats
* signature_algorithms (for TLSv1.2 only)
*
* We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8,
* but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them.
* Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from
* 10.8..10.8.3 (which don't work).
*/
static void ssl_check_for_safari(SSL *s, const CLIENTHELLO_MSG *hello)
{
static const unsigned char kSafariExtensionsBlock[] = {
0x00, 0x0a, /* elliptic_curves extension */
0x00, 0x08, /* 8 bytes */
0x00, 0x06, /* 6 bytes of curve ids */
0x00, 0x17, /* P-256 */
0x00, 0x18, /* P-384 */
0x00, 0x19, /* P-521 */
0x00, 0x0b, /* ec_point_formats */
0x00, 0x02, /* 2 bytes */
0x01, /* 1 point format */
0x00, /* uncompressed */
/* The following is only present in TLS 1.2 */
0x00, 0x0d, /* signature_algorithms */
0x00, 0x0c, /* 12 bytes */
0x00, 0x0a, /* 10 bytes */
0x05, 0x01, /* SHA-384/RSA */
0x04, 0x01, /* SHA-256/RSA */
0x02, 0x01, /* SHA-1/RSA */
0x04, 0x03, /* SHA-256/ECDSA */
0x02, 0x03, /* SHA-1/ECDSA */
};
/* Length of the common prefix (first two extensions). */
static const size_t kSafariCommonExtensionsLength = 18;
unsigned int type;
PACKET sni, tmppkt;
size_t ext_len;
tmppkt = hello->extensions;
if (!PACKET_forward(&tmppkt, 2)
|| !PACKET_get_net_2(&tmppkt, &type)
|| !PACKET_get_length_prefixed_2(&tmppkt, &sni)) {
return;
}
if (type != TLSEXT_TYPE_server_name)
return;
ext_len = TLS1_get_client_version(s) >= TLS1_2_VERSION ?
sizeof(kSafariExtensionsBlock) : kSafariCommonExtensionsLength;
s->s3.is_probably_safari = PACKET_equal(&tmppkt, kSafariExtensionsBlock,
ext_len);
}
#define RENEG_OPTIONS_OK(options) \
((options & SSL_OP_NO_RENEGOTIATION) == 0 \
&& (options & SSL_OP_ALLOW_CLIENT_RENEGOTIATION) != 0)
MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt)
{
/* |cookie| will only be initialized for DTLS. */
PACKET session_id, compression, extensions, cookie;
static const unsigned char null_compression = 0;
CLIENTHELLO_MSG *clienthello = NULL;
/* Check if this is actually an unexpected renegotiation ClientHello */
if (s->renegotiate == 0 && !SSL_IS_FIRST_HANDSHAKE(s)) {
if (!ossl_assert(!SSL_IS_TLS13(s))) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
if (!RENEG_OPTIONS_OK(s->options)
|| (!s->s3.send_connection_binding
&& (s->options
& SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) == 0)) {
ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_RENEGOTIATION);
return MSG_PROCESS_FINISHED_READING;
}
s->renegotiate = 1;
s->new_session = 1;
}
clienthello = OPENSSL_zalloc(sizeof(*clienthello));
if (clienthello == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
/*
* First, parse the raw ClientHello data into the CLIENTHELLO_MSG structure.
*/
clienthello->isv2 = RECORD_LAYER_is_sslv2_record(&s->rlayer);
PACKET_null_init(&cookie);
if (clienthello->isv2) {
unsigned int mt;
if (!SSL_IS_FIRST_HANDSHAKE(s)
|| s->hello_retry_request != SSL_HRR_NONE) {
SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_R_UNEXPECTED_MESSAGE);
goto err;
}
/*-
* An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
* header is sent directly on the wire, not wrapped as a TLS
* record. Our record layer just processes the message length and passes
* the rest right through. Its format is:
* Byte Content
* 0-1 msg_length - decoded by the record layer
* 2 msg_type - s->init_msg points here
* 3-4 version
* 5-6 cipher_spec_length
* 7-8 session_id_length
* 9-10 challenge_length
* ... ...
*/
if (!PACKET_get_1(pkt, &mt)
|| mt != SSL2_MT_CLIENT_HELLO) {
/*
* Should never happen. We should have tested this in the record
* layer in order to have determined that this is a SSLv2 record
* in the first place
*/
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
}
if (!PACKET_get_net_2(pkt, &clienthello->legacy_version)) {
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_TOO_SHORT);
goto err;
}
/* Parse the message and load client random. */
if (clienthello->isv2) {
/*
* Handle an SSLv2 backwards compatible ClientHello
* Note, this is only for SSLv3+ using the backward compatible format.
* Real SSLv2 is not supported, and is rejected below.
*/
unsigned int ciphersuite_len, session_id_len, challenge_len;
PACKET challenge;
if (!PACKET_get_net_2(pkt, &ciphersuite_len)
|| !PACKET_get_net_2(pkt, &session_id_len)
|| !PACKET_get_net_2(pkt, &challenge_len)) {
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_RECORD_LENGTH_MISMATCH);
goto err;
}
if (session_id_len > SSL_MAX_SSL_SESSION_ID_LENGTH) {
SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_LENGTH_MISMATCH);
goto err;
}
if (!PACKET_get_sub_packet(pkt, &clienthello->ciphersuites,
ciphersuite_len)
|| !PACKET_copy_bytes(pkt, clienthello->session_id, session_id_len)
|| !PACKET_get_sub_packet(pkt, &challenge, challenge_len)
/* No extensions. */
|| PACKET_remaining(pkt) != 0) {
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_RECORD_LENGTH_MISMATCH);
goto err;
}
clienthello->session_id_len = session_id_len;
/* Load the client random and compression list. We use SSL3_RANDOM_SIZE
* here rather than sizeof(clienthello->random) because that is the limit
* for SSLv3 and it is fixed. It won't change even if
* sizeof(clienthello->random) does.
*/
challenge_len = challenge_len > SSL3_RANDOM_SIZE
? SSL3_RANDOM_SIZE : challenge_len;
memset(clienthello->random, 0, SSL3_RANDOM_SIZE);
if (!PACKET_copy_bytes(&challenge,
clienthello->random + SSL3_RANDOM_SIZE -
challenge_len, challenge_len)
/* Advertise only null compression. */
|| !PACKET_buf_init(&compression, &null_compression, 1)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
PACKET_null_init(&clienthello->extensions);
} else {
/* Regular ClientHello. */
if (!PACKET_copy_bytes(pkt, clienthello->random, SSL3_RANDOM_SIZE)
|| !PACKET_get_length_prefixed_1(pkt, &session_id)
|| !PACKET_copy_all(&session_id, clienthello->session_id,
SSL_MAX_SSL_SESSION_ID_LENGTH,
&clienthello->session_id_len)) {
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
goto err;
}
if (SSL_IS_DTLS(s)) {
if (!PACKET_get_length_prefixed_1(pkt, &cookie)) {
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
goto err;
}
if (!PACKET_copy_all(&cookie, clienthello->dtls_cookie,
DTLS1_COOKIE_LENGTH,
&clienthello->dtls_cookie_len)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
/*
* If we require cookies 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_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
if (clienthello->dtls_cookie_len == 0) {
OPENSSL_free(clienthello);
return MSG_PROCESS_FINISHED_READING;
}
}
}
if (!PACKET_get_length_prefixed_2(pkt, &clienthello->ciphersuites)) {
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
goto err;
}
if (!PACKET_get_length_prefixed_1(pkt, &compression)) {
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
goto err;
}
/* Could be empty. */
if (PACKET_remaining(pkt) == 0) {
PACKET_null_init(&clienthello->extensions);
} else {
if (!PACKET_get_length_prefixed_2(pkt, &clienthello->extensions)
|| PACKET_remaining(pkt) != 0) {
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
goto err;
}
}
}
if (!PACKET_copy_all(&compression, clienthello->compressions,
MAX_COMPRESSIONS_SIZE,
&clienthello->compressions_len)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
/* Preserve the raw extensions PACKET for later use */
extensions = clienthello->extensions;
if (!tls_collect_extensions(s, &extensions, SSL_EXT_CLIENT_HELLO,
&clienthello->pre_proc_exts,
&clienthello->pre_proc_exts_len, 1)) {
/* SSLfatal already been called */
goto err;
}
s->clienthello = clienthello;
return MSG_PROCESS_CONTINUE_PROCESSING;
err:
if (clienthello != NULL)
OPENSSL_free(clienthello->pre_proc_exts);
OPENSSL_free(clienthello);
return MSG_PROCESS_ERROR;
}
static int tls_early_post_process_client_hello(SSL *s)
{
unsigned int j;
int i, al = SSL_AD_INTERNAL_ERROR;
int protverr;
size_t loop;
unsigned long id;
#ifndef OPENSSL_NO_COMP
SSL_COMP *comp = NULL;
#endif
const SSL_CIPHER *c;
STACK_OF(SSL_CIPHER) *ciphers = NULL;
STACK_OF(SSL_CIPHER) *scsvs = NULL;
CLIENTHELLO_MSG *clienthello = s->clienthello;
DOWNGRADE dgrd = DOWNGRADE_NONE;
/* Finished parsing the ClientHello, now we can start processing it */
/* Give the ClientHello callback a crack at things */
if (s->ctx->client_hello_cb != NULL) {
/* A failure in the ClientHello callback terminates the connection. */
switch (s->ctx->client_hello_cb(s, &al, s->ctx->client_hello_cb_arg)) {
case SSL_CLIENT_HELLO_SUCCESS:
break;
case SSL_CLIENT_HELLO_RETRY:
s->rwstate = SSL_CLIENT_HELLO_CB;
return -1;
case SSL_CLIENT_HELLO_ERROR:
default:
SSLfatal(s, al, SSL_R_CALLBACK_FAILED);
goto err;
}
}
/* Set up the client_random */
memcpy(s->s3.client_random, clienthello->random, SSL3_RANDOM_SIZE);
/* Choose the version */
if (clienthello->isv2) {
if (clienthello->legacy_version == SSL2_VERSION
|| (clienthello->legacy_version & 0xff00)
!= (SSL3_VERSION_MAJOR << 8)) {
/*
* This is real SSLv2 or something completely unknown. We don't
* support it.
*/
SSLfatal(s, SSL_AD_PROTOCOL_VERSION, SSL_R_UNKNOWN_PROTOCOL);
goto err;
}
/* SSLv3/TLS */
s->client_version = clienthello->legacy_version;
}
/*
* Do SSL/TLS version negotiation if applicable. For DTLS we just check
* versions are potentially compatible. Version negotiation comes later.
*/
if (!SSL_IS_DTLS(s)) {
protverr = ssl_choose_server_version(s, clienthello, &dgrd);
} else if (s->method->version != DTLS_ANY_VERSION &&
DTLS_VERSION_LT((int)clienthello->legacy_version, s->version)) {
protverr = SSL_R_VERSION_TOO_LOW;
} else {
protverr = 0;
}
if (protverr) {
if (SSL_IS_FIRST_HANDSHAKE(s)) {
/* like ssl3_get_record, send alert using remote version number */
s->version = s->client_version = clienthello->legacy_version;
}
SSLfatal(s, SSL_AD_PROTOCOL_VERSION, protverr);
goto err;
}
/* TLSv1.3 specifies that a ClientHello must end on a record boundary */
if (SSL_IS_TLS13(s) && RECORD_LAYER_processed_read_pending(&s->rlayer)) {
SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_R_NOT_ON_RECORD_BOUNDARY);
goto err;
}
if (SSL_IS_DTLS(s)) {
/* Empty cookie was already handled above by returning early. */
if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
if (s->ctx->app_verify_cookie_cb != NULL) {
if (s->ctx->app_verify_cookie_cb(s, clienthello->dtls_cookie,
clienthello->dtls_cookie_len) == 0) {
SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
SSL_R_COOKIE_MISMATCH);
goto err;
/* else cookie verification succeeded */
}
/* default verification */
} else if (s->d1->cookie_len != clienthello->dtls_cookie_len
|| memcmp(clienthello->dtls_cookie, s->d1->cookie,
s->d1->cookie_len) != 0) {
SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_COOKIE_MISMATCH);
goto err;
}
s->d1->cookie_verified = 1;
}
if (s->method->version == DTLS_ANY_VERSION) {
protverr = ssl_choose_server_version(s, clienthello, &dgrd);
if (protverr != 0) {
s->version = s->client_version;
SSLfatal(s, SSL_AD_PROTOCOL_VERSION, protverr);
goto err;
}
}
}
s->hit = 0;
if (!ssl_cache_cipherlist(s, &clienthello->ciphersuites,
clienthello->isv2) ||
!bytes_to_cipher_list(s, &clienthello->ciphersuites, &ciphers, &scsvs,
clienthello->isv2, 1)) {
/* SSLfatal() already called */
goto err;
}
s->s3.send_connection_binding = 0;
/* Check what signalling cipher-suite values were received. */
if (scsvs != NULL) {
for(i = 0; i < sk_SSL_CIPHER_num(scsvs); i++) {
c = sk_SSL_CIPHER_value(scsvs, i);
if (SSL_CIPHER_get_id(c) == SSL3_CK_SCSV) {
if (s->renegotiate) {
/* SCSV is fatal if renegotiating */
SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING);
goto err;
}
s->s3.send_connection_binding = 1;
} else if (SSL_CIPHER_get_id(c) == SSL3_CK_FALLBACK_SCSV &&
!ssl_check_version_downgrade(s)) {
/*
* This SCSV indicates that the client previously tried
* a higher version. We should fail if the current version
* is an unexpected downgrade, as that indicates that the first
* connection may have been tampered with in order to trigger
* an insecure downgrade.
*/
SSLfatal(s, SSL_AD_INAPPROPRIATE_FALLBACK,
SSL_R_INAPPROPRIATE_FALLBACK);
goto err;
}
}
}
/* For TLSv1.3 we must select the ciphersuite *before* session resumption */
if (SSL_IS_TLS13(s)) {
const SSL_CIPHER *cipher =
ssl3_choose_cipher(s, ciphers, SSL_get_ciphers(s));
if (cipher == NULL) {
SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_NO_SHARED_CIPHER);
goto err;
}
if (s->hello_retry_request == SSL_HRR_PENDING
&& (s->s3.tmp.new_cipher == NULL
|| s->s3.tmp.new_cipher->id != cipher->id)) {
/*
* A previous HRR picked a different ciphersuite to the one we
* just selected. Something must have changed.
*/
SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_CIPHER);
goto err;
}
s->s3.tmp.new_cipher = cipher;
}
/* We need to do this before getting the session */
if (!tls_parse_extension(s, TLSEXT_IDX_extended_master_secret,
SSL_EXT_CLIENT_HELLO,
clienthello->pre_proc_exts, NULL, 0)) {
/* SSLfatal() already called */
goto err;
}
/*
* We don't allow resumption in a backwards compatible ClientHello.
* In TLS1.1+, session_id MUST be empty.
*
* 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->new_session remains
* unset): for servers, this essentially just means that the
* SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be
* ignored.
*/
if (clienthello->isv2 ||
(s->new_session &&
(s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) {
if (!ssl_get_new_session(s, 1)) {
/* SSLfatal() already called */
goto err;
}
} else {
i = ssl_get_prev_session(s, clienthello);
if (i == 1) {
/* previous session */
s->hit = 1;
} else if (i == -1) {
/* SSLfatal() already called */
goto err;
} else {
/* i == 0 */
if (!ssl_get_new_session(s, 1)) {
/* SSLfatal() already called */
goto err;
}
}
}
if (SSL_IS_TLS13(s)) {
memcpy(s->tmp_session_id, s->clienthello->session_id,
s->clienthello->session_id_len);
s->tmp_session_id_len = s->clienthello->session_id_len;
}
/*
* If it is a hit, check that the cipher is in the list. In TLSv1.3 we check
* ciphersuite compatibility with the session as part of resumption.
*/
if (!SSL_IS_TLS13(s) && s->hit) {
j = 0;
id = s->session->cipher->id;
OSSL_TRACE_BEGIN(TLS_CIPHER) {
BIO_printf(trc_out, "client sent %d ciphers\n",
sk_SSL_CIPHER_num(ciphers));
}
for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
c = sk_SSL_CIPHER_value(ciphers, i);
if (trc_out != NULL)
BIO_printf(trc_out, "client [%2d of %2d]:%s\n", i,
sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c));
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
*/
SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
SSL_R_REQUIRED_CIPHER_MISSING);
OSSL_TRACE_CANCEL(TLS_CIPHER);
goto err;
}
OSSL_TRACE_END(TLS_CIPHER);
}
for (loop = 0; loop < clienthello->compressions_len; loop++) {
if (clienthello->compressions[loop] == 0)
break;
}
if (loop >= clienthello->compressions_len) {
/* no compress */
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_NO_COMPRESSION_SPECIFIED);
goto err;
}
if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
ssl_check_for_safari(s, clienthello);
/* TLS extensions */
if (!tls_parse_all_extensions(s, SSL_EXT_CLIENT_HELLO,
clienthello->pre_proc_exts, NULL, 0, 1)) {
/* SSLfatal() already called */
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.
*/
{
unsigned char *pos;
pos = s->s3.server_random;
if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE, dgrd) <= 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
}
if (!s->hit
&& s->version >= TLS1_VERSION
&& !SSL_IS_TLS13(s)
&& !SSL_IS_DTLS(s)
&& s->ext.session_secret_cb) {
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, ciphers,
&pref_cipher,
s->ext.session_secret_cb_arg)
&& master_key_length > 0) {
s->session->master_key_length = master_key_length;
s->hit = 1;
s->peer_ciphers = ciphers;
s->session->verify_result = X509_V_OK;
ciphers = NULL;
/* check if some cipher was preferred by call back */
if (pref_cipher == NULL)
pref_cipher = ssl3_choose_cipher(s, s->peer_ciphers,
SSL_get_ciphers(s));
if (pref_cipher == NULL) {
SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_NO_SHARED_CIPHER);
goto err;
}
s->session->cipher = pref_cipher;
sk_SSL_CIPHER_free(s->cipher_list);
s->cipher_list = sk_SSL_CIPHER_dup(s->peer_ciphers);
sk_SSL_CIPHER_free(s->cipher_list_by_id);
s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->peer_ciphers);
}
}
/*
* Worst case, we will use the NULL compression, but if we have other
* options, we will now look for them. We have complen-1 compression
* algorithms from the client, starting at q.
*/
s->s3.tmp.new_compression = NULL;
if (SSL_IS_TLS13(s)) {
/*
* We already checked above that the NULL compression method appears in
* the list. Now we check there aren't any others (which is illegal in
* a TLSv1.3 ClientHello.
*/
if (clienthello->compressions_len != 1) {
SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
SSL_R_INVALID_COMPRESSION_ALGORITHM);
goto err;
}
}
#ifndef OPENSSL_NO_COMP
/* This only happens if we have a cache hit */
else if (s->session->compress_meth != 0) {
int m, comp_id = s->session->compress_meth;
unsigned int k;
/* Perform sanity checks on resumed compression algorithm */
/* Can't disable compression */
if (!ssl_allow_compression(s)) {
SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
SSL_R_INCONSISTENT_COMPRESSION);
goto err;
}
/* Look for resumed compression method */
for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) {
comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
if (comp_id == comp->id) {
s->s3.tmp.new_compression = comp;
break;
}
}
if (s->s3.tmp.new_compression == NULL) {
SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
SSL_R_INVALID_COMPRESSION_ALGORITHM);
goto err;
}
/* Look for resumed method in compression list */
for (k = 0; k < clienthello->compressions_len; k++) {
if (clienthello->compressions[k] == comp_id)
break;
}
if (k >= clienthello->compressions_len) {
SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
SSL_R_REQUIRED_COMPRESSION_ALGORITHM_MISSING);
goto err;
}
} else if (s->hit) {
comp = NULL;
} else if (ssl_allow_compression(s) && s->ctx->comp_methods) {
/* See if we have a match */
int m, nn, v, done = 0;
unsigned int o;
nn = sk_SSL_COMP_num(s->ctx->comp_methods);
for (m = 0; m < nn; m++) {
comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
v = comp->id;
for (o = 0; o < clienthello->compressions_len; o++) {
if (v == clienthello->compressions[o]) {
done = 1;
break;
}
}
if (done)
break;
}
if (done)
s->s3.tmp.new_compression = comp;
else
comp = NULL;
}
#else
/*
* If compression is disabled we'd better not try to resume a session
* using compression.
*/
if (s->session->compress_meth != 0) {
SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_INCONSISTENT_COMPRESSION);
goto err;
}
#endif
/*
* Given s->peer_ciphers and SSL_get_ciphers, we must pick a cipher
*/
if (!s->hit || SSL_IS_TLS13(s)) {
sk_SSL_CIPHER_free(s->peer_ciphers);
s->peer_ciphers = ciphers;
if (ciphers == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
ciphers = NULL;
}
if (!s->hit) {
#ifdef OPENSSL_NO_COMP
s->session->compress_meth = 0;
#else
s->session->compress_meth = (comp == NULL) ? 0 : comp->id;
#endif
if (!tls1_set_server_sigalgs(s)) {
/* SSLfatal() already called */
goto err;
}
}
sk_SSL_CIPHER_free(ciphers);
sk_SSL_CIPHER_free(scsvs);
OPENSSL_free(clienthello->pre_proc_exts);
OPENSSL_free(s->clienthello);
s->clienthello = NULL;
return 1;
err:
sk_SSL_CIPHER_free(ciphers);
sk_SSL_CIPHER_free(scsvs);
OPENSSL_free(clienthello->pre_proc_exts);
OPENSSL_free(s->clienthello);
s->clienthello = NULL;
return 0;
}
/*
* Call the status request callback if needed. Upon success, returns 1.
* Upon failure, returns 0.
*/
static int tls_handle_status_request(SSL *s)
{
s->ext.status_expected = 0;
/*
* If status request then ask callback what to do. Note: this must be
* called after servername callbacks in case the certificate has changed,
* and must be called after the cipher has been chosen because this may
* influence which certificate is sent
*/
if (s->ext.status_type != TLSEXT_STATUSTYPE_nothing && s->ctx != NULL
&& s->ctx->ext.status_cb != NULL) {
int ret;
/* If no certificate can't return certificate status */
if (s->s3.tmp.cert != NULL) {
/*
* Set current certificate to one we will use so SSL_get_certificate
* et al can pick it up.
*/
s->cert->key = s->s3.tmp.cert;
ret = s->ctx->ext.status_cb(s, s->ctx->ext.status_arg);
switch (ret) {
/* We don't want to send a status request response */
case SSL_TLSEXT_ERR_NOACK:
s->ext.status_expected = 0;
break;
/* status request response should be sent */
case SSL_TLSEXT_ERR_OK:
if (s->ext.ocsp.resp)
s->ext.status_expected = 1;
break;
/* something bad happened */
case SSL_TLSEXT_ERR_ALERT_FATAL:
default:
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_CLIENTHELLO_TLSEXT);
return 0;
}
}
}
return 1;
}
/*
* Call the alpn_select callback if needed. Upon success, returns 1.
* Upon failure, returns 0.
*/
int tls_handle_alpn(SSL *s)
{
const unsigned char *selected = NULL;
unsigned char selected_len = 0;
if (s->ctx->ext.alpn_select_cb != NULL && s->s3.alpn_proposed != NULL) {
int r = s->ctx->ext.alpn_select_cb(s, &selected, &selected_len,
s->s3.alpn_proposed,
(unsigned int)s->s3.alpn_proposed_len,
s->ctx->ext.alpn_select_cb_arg);
if (r == SSL_TLSEXT_ERR_OK) {
OPENSSL_free(s->s3.alpn_selected);
s->s3.alpn_selected = OPENSSL_memdup(selected, selected_len);
if (s->s3.alpn_selected == NULL) {
s->s3.alpn_selected_len = 0;
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return 0;
}
s->s3.alpn_selected_len = selected_len;
#ifndef OPENSSL_NO_NEXTPROTONEG
/* ALPN takes precedence over NPN. */
s->s3.npn_seen = 0;
#endif
/* Check ALPN is consistent with session */
if (s->session->ext.alpn_selected == NULL
|| selected_len != s->session->ext.alpn_selected_len
|| memcmp(selected, s->session->ext.alpn_selected,
selected_len) != 0) {
/* Not consistent so can't be used for early_data */
s->ext.early_data_ok = 0;
if (!s->hit) {
/*
* This is a new session and so alpn_selected should have
* been initialised to NULL. We should update it with the
* selected ALPN.
*/
if (!ossl_assert(s->session->ext.alpn_selected == NULL)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR,
ERR_R_INTERNAL_ERROR);
return 0;
}
s->session->ext.alpn_selected = OPENSSL_memdup(selected,
selected_len);
if (s->session->ext.alpn_selected == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR,
ERR_R_INTERNAL_ERROR);
return 0;
}
s->session->ext.alpn_selected_len = selected_len;
}
}
return 1;
} else if (r != SSL_TLSEXT_ERR_NOACK) {
SSLfatal(s, SSL_AD_NO_APPLICATION_PROTOCOL,
SSL_R_NO_APPLICATION_PROTOCOL);
return 0;
}
/*
* If r == SSL_TLSEXT_ERR_NOACK then behave as if no callback was
* present.
*/
}
/* Check ALPN is consistent with session */
if (s->session->ext.alpn_selected != NULL) {
/* Not consistent so can't be used for early_data */
s->ext.early_data_ok = 0;
}
return 1;
}
WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst)
{
const SSL_CIPHER *cipher;
if (wst == WORK_MORE_A) {
int rv = tls_early_post_process_client_hello(s);
if (rv == 0) {
/* SSLfatal() was already called */
goto err;
}
if (rv < 0)
return WORK_MORE_A;
wst = WORK_MORE_B;
}
if (wst == WORK_MORE_B) {
if (!s->hit || SSL_IS_TLS13(s)) {
/* Let cert callback update server certificates if required */
if (!s->hit && s->cert->cert_cb != NULL) {
int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
if (rv == 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_CERT_CB_ERROR);
goto err;
}
if (rv < 0) {
s->rwstate = SSL_X509_LOOKUP;
return WORK_MORE_B;
}
s->rwstate = SSL_NOTHING;
}
/* In TLSv1.3 we selected the ciphersuite before resumption */
if (!SSL_IS_TLS13(s)) {
cipher =
ssl3_choose_cipher(s, s->peer_ciphers, SSL_get_ciphers(s));
if (cipher == NULL) {
SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
SSL_R_NO_SHARED_CIPHER);
goto err;
}
s->s3.tmp.new_cipher = cipher;
}
if (!s->hit) {
if (!tls_choose_sigalg(s, 1)) {
/* SSLfatal already called */
goto err;
}
/* check whether we should disable session resumption */
if (s->not_resumable_session_cb != NULL)
s->session->not_resumable =
s->not_resumable_session_cb(s,
((s->s3.tmp.new_cipher->algorithm_mkey
& (SSL_kDHE | SSL_kECDHE)) != 0));
if (s->session->not_resumable)
/* do not send a session ticket */
s->ext.ticket_expected = 0;
}
} else {
/* Session-id reuse */
s->s3.tmp.new_cipher = s->session->cipher;
}
/*-
* we now have the following setup.
* client_random
* cipher_list - our preferred list of ciphers
* ciphers - the clients preferred list of ciphers
* compression - basically ignored right now
* ssl version is set - sslv3
* s->session - The ssl session has been setup.
* s->hit - session reuse flag
* s->s3.tmp.new_cipher - the new cipher to use.
*/
/*
* Call status_request callback if needed. Has to be done after the
* certificate callbacks etc above.
*/
if (!tls_handle_status_request(s)) {
/* SSLfatal() already called */
goto err;
}
/*
* Call alpn_select callback if needed. Has to be done after SNI and
* cipher negotiation (HTTP/2 restricts permitted ciphers). In TLSv1.3
* we already did this because cipher negotiation happens earlier, and
* we must handle ALPN before we decide whether to accept early_data.
*/
if (!SSL_IS_TLS13(s) && !tls_handle_alpn(s)) {
/* SSLfatal() already called */
goto err;
}
wst = WORK_MORE_C;
}
#ifndef OPENSSL_NO_SRP
if (wst == WORK_MORE_C) {
int ret;
if ((ret = ssl_check_srp_ext_ClientHello(s)) == 0) {
/*
* callback indicates further work to be done
*/
s->rwstate = SSL_X509_LOOKUP;
return WORK_MORE_C;
}
if (ret < 0) {
/* SSLfatal() already called */
goto err;
}
}
#endif
return WORK_FINISHED_STOP;
err:
return WORK_ERROR;
}
int tls_construct_server_hello(SSL *s, WPACKET *pkt)
{
int compm;
size_t sl, len;
int version;
unsigned char *session_id;
int usetls13 = SSL_IS_TLS13(s) || s->hello_retry_request == SSL_HRR_PENDING;
version = usetls13 ? TLS1_2_VERSION : s->version;
if (!WPACKET_put_bytes_u16(pkt, version)
/*
* Random stuff. Filling of the server_random takes place in
* tls_process_client_hello()
*/
|| !WPACKET_memcpy(pkt,
s->hello_retry_request == SSL_HRR_PENDING
? hrrrandom : s->s3.server_random,
SSL3_RANDOM_SIZE)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return 0;
}
/*-
* 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.
* - In TLSv1.3 we echo back the session id sent to us by the client
* regardless
* s->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->session->not_resumable ||
(!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
&& !s->hit))
s->session->session_id_length = 0;
if (usetls13) {
sl = s->tmp_session_id_len;
session_id = s->tmp_session_id;
} else {
sl = s->session->session_id_length;
session_id = s->session->session_id;
}
if (sl > sizeof(s->session->session_id)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return 0;
}
/* set up the compression method */
#ifdef OPENSSL_NO_COMP
compm = 0;
#else
if (usetls13 || s->s3.tmp.new_compression == NULL)
compm = 0;
else
compm = s->s3.tmp.new_compression->id;
#endif
if (!WPACKET_sub_memcpy_u8(pkt, session_id, sl)
|| !s->method->put_cipher_by_char(s->s3.tmp.new_cipher, pkt, &len)
|| !WPACKET_put_bytes_u8(pkt, compm)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return 0;
}
if (!tls_construct_extensions(s, pkt,
s->hello_retry_request == SSL_HRR_PENDING
? SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST
: (SSL_IS_TLS13(s)
? SSL_EXT_TLS1_3_SERVER_HELLO
: SSL_EXT_TLS1_2_SERVER_HELLO),
NULL, 0)) {
/* SSLfatal() already called */
return 0;
}
if (s->hello_retry_request == SSL_HRR_PENDING) {
/* Ditch the session. We'll create a new one next time around */
SSL_SESSION_free(s->session);
s->session = NULL;
s->hit = 0;
/*
* Re-initialise the Transcript Hash. We're going to prepopulate it with
* a synthetic message_hash in place of ClientHello1.
*/
if (!create_synthetic_message_hash(s, NULL, 0, NULL, 0)) {
/* SSLfatal() already called */
return 0;
}
} else if (!(s->verify_mode & SSL_VERIFY_PEER)
&& !ssl3_digest_cached_records(s, 0)) {
/* SSLfatal() already called */;
return 0;
}
return 1;
}
int tls_construct_server_done(SSL *s, WPACKET *pkt)
{
if (!s->s3.tmp.cert_request) {
if (!ssl3_digest_cached_records(s, 0)) {
/* SSLfatal() already called */
return 0;
}
}
return 1;
}
int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt)
{
EVP_PKEY *pkdh = NULL;
unsigned char *encodedPoint = NULL;
size_t encodedlen = 0;
int curve_id = 0;
const SIGALG_LOOKUP *lu = s->s3.tmp.sigalg;
int i;
unsigned long type;
BIGNUM *r[4];
EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
EVP_PKEY_CTX *pctx = NULL;
size_t paramlen, paramoffset;
int freer = 0, ret = 0;
if (!WPACKET_get_total_written(pkt, &paramoffset)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
if (md_ctx == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
goto err;
}
type = s->s3.tmp.new_cipher->algorithm_mkey;
r[0] = r[1] = r[2] = r[3] = NULL;
#ifndef OPENSSL_NO_PSK
/* Plain PSK or RSAPSK nothing to do */
if (type & (SSL_kPSK | SSL_kRSAPSK)) {
} else
#endif /* !OPENSSL_NO_PSK */
if (type & (SSL_kDHE | SSL_kDHEPSK)) {
CERT *cert = s->cert;
EVP_PKEY *pkdhp = NULL;
if (s->cert->dh_tmp_auto) {
pkdh = ssl_get_auto_dh(s);
if (pkdh == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
pkdhp = pkdh;
} else {
pkdhp = cert->dh_tmp;
}
#if !defined(OPENSSL_NO_DEPRECATED_3_0)
if ((pkdhp == NULL) && (s->cert->dh_tmp_cb != NULL)) {
pkdh = ssl_dh_to_pkey(s->cert->dh_tmp_cb(s, 0, 1024));
if (pkdh == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
pkdhp = pkdh;
}
#endif
if (pkdhp == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_MISSING_TMP_DH_KEY);
goto err;
}
if (!ssl_security(s, SSL_SECOP_TMP_DH,
EVP_PKEY_get_security_bits(pkdhp), 0, pkdhp)) {
SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_DH_KEY_TOO_SMALL);
goto err;
}
if (s->s3.tmp.pkey != NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
s->s3.tmp.pkey = ssl_generate_pkey(s, pkdhp);
if (s->s3.tmp.pkey == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
EVP_PKEY_free(pkdh);
pkdh = NULL;
/* These BIGNUMs need to be freed when we're finished */
freer = 1;
if (!EVP_PKEY_get_bn_param(s->s3.tmp.pkey, OSSL_PKEY_PARAM_FFC_P,
&r[0])
|| !EVP_PKEY_get_bn_param(s->s3.tmp.pkey, OSSL_PKEY_PARAM_FFC_G,
&r[1])
|| !EVP_PKEY_get_bn_param(s->s3.tmp.pkey,
OSSL_PKEY_PARAM_PUB_KEY, &r[2])) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
} else if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
if (s->s3.tmp.pkey != NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
/* Get NID of appropriate shared curve */
curve_id = tls1_shared_group(s, -2);
if (curve_id == 0) {
SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
goto err;
}
/* Cache the group used in the SSL_SESSION */
s->session->kex_group = curve_id;
/* Generate a new key for this curve */
s->s3.tmp.pkey = ssl_generate_pkey_group(s, curve_id);
if (s->s3.tmp.pkey == NULL) {
/* SSLfatal() already called */
goto err;
}
/* Encode the public key. */
encodedlen = EVP_PKEY_get1_encoded_public_key(s->s3.tmp.pkey,
&encodedPoint);
if (encodedlen == 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EC_LIB);
goto err;
}
/*
* We'll generate the serverKeyExchange message explicitly so we
* can set these to NULLs
*/
r[0] = NULL;
r[1] = NULL;
r[2] = NULL;
r[3] = NULL;
} else
#ifndef OPENSSL_NO_SRP
if (type & SSL_kSRP) {
if ((s->srp_ctx.N == NULL) ||
(s->srp_ctx.g == NULL) ||
(s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_MISSING_SRP_PARAM);
goto err;
}
r[0] = s->srp_ctx.N;
r[1] = s->srp_ctx.g;
r[2] = s->srp_ctx.s;
r[3] = s->srp_ctx.B;
} else
#endif
{
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
goto err;
}
if (((s->s3.tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP)) != 0)
|| ((s->s3.tmp.new_cipher->algorithm_mkey & SSL_PSK)) != 0) {
lu = NULL;
} else if (lu == NULL) {
SSLfatal(s, SSL_AD_DECODE_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
#ifndef OPENSSL_NO_PSK
if (type & SSL_PSK) {
size_t len = (s->cert->psk_identity_hint == NULL)
? 0 : strlen(s->cert->psk_identity_hint);
/*
* It should not happen that len > PSK_MAX_IDENTITY_LEN - we already
* checked this when we set the identity hint - but just in case
*/
if (len > PSK_MAX_IDENTITY_LEN
|| !WPACKET_sub_memcpy_u16(pkt, s->cert->psk_identity_hint,
len)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
}
#endif
for (i = 0; i < 4 && r[i] != NULL; i++) {
unsigned char *binval;
int res;
#ifndef OPENSSL_NO_SRP
if ((i == 2) && (type & SSL_kSRP)) {
res = WPACKET_start_sub_packet_u8(pkt);
} else
#endif
res = WPACKET_start_sub_packet_u16(pkt);
if (!res) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
/*-
* for interoperability with some versions of the Microsoft TLS
* stack, we need to zero pad the DHE pub key to the same length
* as the prime
*/
if ((i == 2) && (type & (SSL_kDHE | SSL_kDHEPSK))) {
size_t len = BN_num_bytes(r[0]) - BN_num_bytes(r[2]);
if (len > 0) {
if (!WPACKET_allocate_bytes(pkt, len, &binval)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
memset(binval, 0, len);
}
}
if (!WPACKET_allocate_bytes(pkt, BN_num_bytes(r[i]), &binval)
|| !WPACKET_close(pkt)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
BN_bn2bin(r[i], binval);
}
if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
/*
* We only support named (not generic) curves. In this situation, the
* ServerKeyExchange message has: [1 byte CurveType], [2 byte CurveName]
* [1 byte length of encoded point], followed by the actual encoded
* point itself
*/
if (!WPACKET_put_bytes_u8(pkt, NAMED_CURVE_TYPE)
|| !WPACKET_put_bytes_u8(pkt, 0)
|| !WPACKET_put_bytes_u8(pkt, curve_id)
|| !WPACKET_sub_memcpy_u8(pkt, encodedPoint, encodedlen)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
OPENSSL_free(encodedPoint);
encodedPoint = NULL;
}
/* not anonymous */
if (lu != NULL) {
EVP_PKEY *pkey = s->s3.tmp.cert->privatekey;
const EVP_MD *md;
unsigned char *sigbytes1, *sigbytes2, *tbs;
size_t siglen = 0, tbslen;
if (pkey == NULL || !tls1_lookup_md(s->ctx, lu, &md)) {
/* Should never happen */
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
/* Get length of the parameters we have written above */
if (!WPACKET_get_length(pkt, &paramlen)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
/* send signature algorithm */
if (SSL_USE_SIGALGS(s) && !WPACKET_put_bytes_u16(pkt, lu->sigalg)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
if (EVP_DigestSignInit_ex(md_ctx, &pctx,
md == NULL ? NULL : EVP_MD_get0_name(md),
s->ctx->libctx, s->ctx->propq, pkey,
NULL) <= 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
if (lu->sig == EVP_PKEY_RSA_PSS) {
if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0
|| EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, RSA_PSS_SALTLEN_DIGEST) <= 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
goto err;
}
}
tbslen = construct_key_exchange_tbs(s, &tbs,
s->init_buf->data + paramoffset,
paramlen);
if (tbslen == 0) {
/* SSLfatal() already called */
goto err;
}
if (EVP_DigestSign(md_ctx, NULL, &siglen, tbs, tbslen) <=0
|| !WPACKET_sub_reserve_bytes_u16(pkt, siglen, &sigbytes1)
|| EVP_DigestSign(md_ctx, sigbytes1, &siglen, tbs, tbslen) <= 0
|| !WPACKET_sub_allocate_bytes_u16(pkt, siglen, &sigbytes2)
|| sigbytes1 != sigbytes2) {
OPENSSL_free(tbs);
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
OPENSSL_free(tbs);
}
ret = 1;
err:
EVP_PKEY_free(pkdh);
OPENSSL_free(encodedPoint);
EVP_MD_CTX_free(md_ctx);
if (freer) {
BN_free(r[0]);
BN_free(r[1]);
BN_free(r[2]);
BN_free(r[3]);
}
return ret;
}
int tls_construct_certificate_request(SSL *s, WPACKET *pkt)
{
if (SSL_IS_TLS13(s)) {
/* Send random context when doing post-handshake auth */
if (s->post_handshake_auth == SSL_PHA_REQUEST_PENDING) {
OPENSSL_free(s->pha_context);
s->pha_context_len = 32;
if ((s->pha_context = OPENSSL_malloc(s->pha_context_len)) == NULL) {
s->pha_context_len = 0;
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return 0;
}
if (RAND_bytes_ex(s->ctx->libctx, s->pha_context,
s->pha_context_len, 0) <= 0
|| !WPACKET_sub_memcpy_u8(pkt, s->pha_context,
s->pha_context_len)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return 0;
}
/* reset the handshake hash back to just after the ClientFinished */
if (!tls13_restore_handshake_digest_for_pha(s)) {
/* SSLfatal() already called */
return 0;
}
} else {
if (!WPACKET_put_bytes_u8(pkt, 0)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return 0;
}
}
if (!tls_construct_extensions(s, pkt,
SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, NULL,
0)) {
/* SSLfatal() already called */
return 0;
}
goto done;
}
/* get the list of acceptable cert types */
if (!WPACKET_start_sub_packet_u8(pkt)
|| !ssl3_get_req_cert_type(s, pkt) || !WPACKET_close(pkt)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return 0;
}
if (SSL_USE_SIGALGS(s)) {
const uint16_t *psigs;
size_t nl = tls12_get_psigalgs(s, 1, &psigs);
if (!WPACKET_start_sub_packet_u16(pkt)
|| !WPACKET_set_flags(pkt, WPACKET_FLAGS_NON_ZERO_LENGTH)
|| !tls12_copy_sigalgs(s, pkt, psigs, nl)
|| !WPACKET_close(pkt)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return 0;
}
}
if (!construct_ca_names(s, get_ca_names(s), pkt)) {
/* SSLfatal() already called */
return 0;
}
done:
s->certreqs_sent++;
s->s3.tmp.cert_request = 1;
return 1;
}
static int tls_process_cke_psk_preamble(SSL *s, PACKET *pkt)
{
#ifndef OPENSSL_NO_PSK
unsigned char psk[PSK_MAX_PSK_LEN];
size_t psklen;
PACKET psk_identity;
if (!PACKET_get_length_prefixed_2(pkt, &psk_identity)) {
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
return 0;
}
if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) {
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_DATA_LENGTH_TOO_LONG);
return 0;
}
if (s->psk_server_callback == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_PSK_NO_SERVER_CB);
return 0;
}
if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return 0;
}
psklen = s->psk_server_callback(s, s->session->psk_identity,
psk, sizeof(psk));
if (psklen > PSK_MAX_PSK_LEN) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return 0;
} else if (psklen == 0) {
/*
* PSK related to the given identity not found
*/
SSLfatal(s, SSL_AD_UNKNOWN_PSK_IDENTITY, SSL_R_PSK_IDENTITY_NOT_FOUND);
return 0;
}
OPENSSL_free(s->s3.tmp.psk);
s->s3.tmp.psk = OPENSSL_memdup(psk, psklen);
OPENSSL_cleanse(psk, psklen);
if (s->s3.tmp.psk == NULL) {
s->s3.tmp.psklen = 0;
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
return 0;
}
s->s3.tmp.psklen = psklen;
return 1;