zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/lib/libssl/openssl-1.1.1o/ssl/statem/statem_srvr.c b/ap/lib/libssl/openssl-1.1.1o/ssl/statem/statem_srvr.c
new file mode 100644
index 0000000..43f77a5
--- /dev/null
+++ b/ap/lib/libssl/openssl-1.1.1o/ssl/statem/statem_srvr.c
@@ -0,0 +1,4308 @@
+/*
+ * Copyright 1995-2022 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 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
+ */
+
+#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/hmac.h>
+#include <openssl/x509.h>
+#include <openssl/dh.h>
+#include <openssl/bn.h>
+#include <openssl/md5.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_F_OSSL_STATEM_SERVER_READ_TRANSITION,
+ 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_F_OSSL_STATEM_SERVER_READ_TRANSITION,
+ 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,
+ SSL_F_OSSL_STATEM_SERVER13_WRITE_TRANSITION,
+ 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;
+ }
+ /* 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 (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,
+ SSL_F_OSSL_STATEM_SERVER_WRITE_TRANSITION,
+ 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) {
+ /*
+ * 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,
+ SSL_F_OSSL_STATEM_SERVER_PRE_WORK,
+ 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,
+ SSL_F_OSSL_STATEM_SERVER_POST_WORK,
+ 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_F_OSSL_STATEM_SERVER_CONSTRUCT_MESSAGE,
+ 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,
+ SSL_F_OSSL_STATEM_SERVER_PROCESS_MESSAGE,
+ 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,
+ SSL_F_OSSL_STATEM_SERVER_POST_PROCESS_MESSAGE,
+ 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_F_SSL_CHECK_SRP_EXT_CLIENTHELLO,
+ SSL_R_PSK_IDENTITY_NOT_FOUND);
+ return -1;
+ } else {
+ ret = SSL_srp_server_param_with_username(s, &al);
+ if (ret < 0)
+ return 0;
+ if (ret == SSL3_AL_FATAL) {
+ SSLfatal(s, al, SSL_F_SSL_CHECK_SRP_EXT_CLIENTHELLO,
+ 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 > 255) {
+ SSLfatal(s, SSL_AD_NO_ALERT, SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST,
+ 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, SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+
+ return 1;
+}
+
+#ifndef OPENSSL_NO_EC
+/*-
+ * 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);
+}
+#endif /* !OPENSSL_NO_EC */
+
+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, SSL_F_TLS_PROCESS_CLIENT_HELLO,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ if ((s->options & SSL_OP_NO_RENEGOTIATION) != 0
+ || (!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, SSL_F_TLS_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_PROCESS_CLIENT_HELLO, 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, SSL_F_TLS_PROCESS_CLIENT_HELLO,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ }
+
+ if (!PACKET_get_net_2(pkt, &clienthello->legacy_version)) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_PROCESS_CLIENT_HELLO,
+ SSL_R_RECORD_LENGTH_MISMATCH);
+ goto err;
+ }
+
+ if (session_id_len > SSL_MAX_SSL_SESSION_ID_LENGTH) {
+ SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
+ SSL_F_TLS_PROCESS_CLIENT_HELLO, 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_F_TLS_PROCESS_CLIENT_HELLO,
+ 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, SSL_F_TLS_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_PROCESS_CLIENT_HELLO,
+ 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,
+ SSL_F_TLS_PROCESS_CLIENT_HELLO, 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_F_TLS_PROCESS_CLIENT_HELLO,
+ SSL_R_LENGTH_MISMATCH);
+ goto err;
+ }
+
+ if (!PACKET_get_length_prefixed_1(pkt, &compression)) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_PROCESS_CLIENT_HELLO,
+ 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, SSL_F_TLS_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ 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,
+ SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 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_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ 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,
+ SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 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_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ 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.
+ * TODO(openssl-team): 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;
+
+#ifdef CIPHER_DEBUG
+ fprintf(stderr, "client sent %d ciphers\n", sk_SSL_CIPHER_num(ciphers));
+#endif
+ for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
+ c = sk_SSL_CIPHER_value(ciphers, i);
+#ifdef CIPHER_DEBUG
+ fprintf(stderr, "client [%2d of %2d]:%s\n",
+ i, sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c));
+#endif
+ 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_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ SSL_R_REQUIRED_CIPHER_MISSING);
+ goto err;
+ }
+ }
+
+ 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_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ SSL_R_NO_COMPRESSION_SPECIFIED);
+ goto err;
+ }
+
+#ifndef OPENSSL_NO_EC
+ if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
+ ssl_check_for_safari(s, clienthello);
+#endif /* !OPENSSL_NO_EC */
+
+ /* 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,
+ SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ 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,
+ SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_HANDLE_STATUS_REQUEST,
+ 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, SSL_F_TLS_HANDLE_ALPN,
+ 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,
+ SSL_F_TLS_HANDLE_ALPN,
+ 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,
+ SSL_F_TLS_HANDLE_ALPN,
+ 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_F_TLS_HANDLE_ALPN,
+ 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_F_TLS_POST_PROCESS_CLIENT_HELLO,
+ 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_F_TLS_POST_PROCESS_CLIENT_HELLO,
+ 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, SSL_F_TLS_CONSTRUCT_SERVER_HELLO,
+ 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, SSL_F_TLS_CONSTRUCT_SERVER_HELLO,
+ 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, SSL_F_TLS_CONSTRUCT_SERVER_HELLO,
+ 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)
+{
+#ifndef OPENSSL_NO_DH
+ EVP_PKEY *pkdh = NULL;
+#endif
+#ifndef OPENSSL_NO_EC
+ unsigned char *encodedPoint = NULL;
+ size_t encodedlen = 0;
+ int curve_id = 0;
+#endif
+ const SIGALG_LOOKUP *lu = s->s3->tmp.sigalg;
+ int i;
+ unsigned long type;
+ const BIGNUM *r[4];
+ EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
+ EVP_PKEY_CTX *pctx = NULL;
+ size_t paramlen, paramoffset;
+
+ if (!WPACKET_get_total_written(pkt, ¶moffset)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ if (md_ctx == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 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 */
+#ifndef OPENSSL_NO_DH
+ if (type & (SSL_kDHE | SSL_kDHEPSK)) {
+ CERT *cert = s->cert;
+
+ EVP_PKEY *pkdhp = NULL;
+ DH *dh;
+
+ if (s->cert->dh_tmp_auto) {
+ DH *dhp = ssl_get_auto_dh(s);
+ pkdh = EVP_PKEY_new();
+ if (pkdh == NULL || dhp == NULL) {
+ DH_free(dhp);
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ EVP_PKEY_assign_DH(pkdh, dhp);
+ pkdhp = pkdh;
+ } else {
+ pkdhp = cert->dh_tmp;
+ }
+ if ((pkdhp == NULL) && (s->cert->dh_tmp_cb != NULL)) {
+ DH *dhp = s->cert->dh_tmp_cb(s, 0, 1024);
+ pkdh = ssl_dh_to_pkey(dhp);
+ if (pkdh == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ pkdhp = pkdh;
+ }
+ if (pkdhp == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ SSL_R_MISSING_TMP_DH_KEY);
+ goto err;
+ }
+ if (!ssl_security(s, SSL_SECOP_TMP_DH,
+ EVP_PKEY_security_bits(pkdhp), 0, pkdhp)) {
+ SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ SSL_R_DH_KEY_TOO_SMALL);
+ goto err;
+ }
+ if (s->s3->tmp.pkey != NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ s->s3->tmp.pkey = ssl_generate_pkey(pkdhp);
+ if (s->s3->tmp.pkey == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, 0, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ dh = EVP_PKEY_get0_DH(s->s3->tmp.pkey);
+ if (dh == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ EVP_PKEY_free(pkdh);
+ pkdh = NULL;
+
+ DH_get0_pqg(dh, &r[0], NULL, &r[1]);
+ DH_get0_key(dh, &r[2], NULL);
+ } else
+#endif
+#ifndef OPENSSL_NO_EC
+ if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
+
+ if (s->s3->tmp.pkey != NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ 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_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
+ goto err;
+ }
+ s->s3->tmp.pkey = ssl_generate_pkey_group(s, curve_id);
+ /* Generate a new key for this curve */
+ if (s->s3->tmp.pkey == NULL) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+
+ /* Encode the public key. */
+ encodedlen = EVP_PKEY_get1_tls_encodedpoint(s->s3->tmp.pkey,
+ &encodedPoint);
+ if (encodedlen == 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 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
+#endif /* !OPENSSL_NO_EC */
+#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_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ 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_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ 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,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 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,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ 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,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+#ifndef OPENSSL_NO_DH
+ /*-
+ * 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,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ memset(binval, 0, len);
+ }
+ }
+#endif
+ if (!WPACKET_allocate_bytes(pkt, BN_num_bytes(r[i]), &binval)
+ || !WPACKET_close(pkt)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ BN_bn2bin(r[i], binval);
+ }
+
+#ifndef OPENSSL_NO_EC
+ 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,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ OPENSSL_free(encodedPoint);
+ encodedPoint = NULL;
+ }
+#endif
+
+ /* 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, tbslen;
+ int rv;
+
+ if (pkey == NULL || !tls1_lookup_md(lu, &md)) {
+ /* Should never happen */
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ /* Get length of the parameters we have written above */
+ if (!WPACKET_get_length(pkt, ¶mlen)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ 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,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ /*
+ * Create the signature. We don't know the actual length of the sig
+ * until after we've created it, so we reserve enough bytes for it
+ * up front, and then properly allocate them in the WPACKET
+ * afterwards.
+ */
+ siglen = EVP_PKEY_size(pkey);
+ if (!WPACKET_sub_reserve_bytes_u16(pkt, siglen, &sigbytes1)
+ || EVP_DigestSignInit(md_ctx, &pctx, md, NULL, pkey) <= 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ 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,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ 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;
+ }
+ rv = EVP_DigestSign(md_ctx, sigbytes1, &siglen, tbs, tbslen);
+ OPENSSL_free(tbs);
+ if (rv <= 0 || !WPACKET_sub_allocate_bytes_u16(pkt, siglen, &sigbytes2)
+ || sigbytes1 != sigbytes2) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ }
+
+ EVP_MD_CTX_free(md_ctx);
+ return 1;
+ err:
+#ifndef OPENSSL_NO_DH
+ EVP_PKEY_free(pkdh);
+#endif
+#ifndef OPENSSL_NO_EC
+ OPENSSL_free(encodedPoint);
+#endif
+ EVP_MD_CTX_free(md_ctx);
+ return 0;
+}
+
+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,
+ SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+ if (RAND_bytes(s->pha_context, s->pha_context_len) <= 0
+ || !WPACKET_sub_memcpy_u8(pkt, s->pha_context,
+ s->pha_context_len)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,
+ 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,
+ SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,
+ 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,
+ SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, 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,
+ SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,
+ 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_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
+ SSL_R_LENGTH_MISMATCH);
+ return 0;
+ }
+ if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
+ SSL_R_DATA_LENGTH_TOO_LONG);
+ return 0;
+ }
+ if (s->psk_server_callback == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
+ SSL_R_PSK_NO_SERVER_CB);
+ return 0;
+ }
+
+ if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
+ 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, SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
+ 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_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
+ 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,
+ SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+
+ s->s3->tmp.psklen = psklen;
+
+ return 1;
+#else
+ /* Should never happen */
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
+#endif
+}
+
+static int tls_process_cke_rsa(SSL *s, PACKET *pkt)
+{
+#ifndef OPENSSL_NO_RSA
+ unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
+ int decrypt_len;
+ unsigned char decrypt_good, version_good;
+ size_t j, padding_len;
+ PACKET enc_premaster;
+ RSA *rsa = NULL;
+ unsigned char *rsa_decrypt = NULL;
+ int ret = 0;
+
+ rsa = EVP_PKEY_get0_RSA(s->cert->pkeys[SSL_PKEY_RSA].privatekey);
+ if (rsa == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_RSA,
+ SSL_R_MISSING_RSA_CERTIFICATE);
+ return 0;
+ }
+
+ /* SSLv3 and pre-standard DTLS omit the length bytes. */
+ if (s->version == SSL3_VERSION || s->version == DTLS1_BAD_VER) {
+ enc_premaster = *pkt;
+ } else {
+ if (!PACKET_get_length_prefixed_2(pkt, &enc_premaster)
+ || PACKET_remaining(pkt) != 0) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_RSA,
+ SSL_R_LENGTH_MISMATCH);
+ return 0;
+ }
+ }
+
+ /*
+ * We want to be sure that the plaintext buffer size makes it safe to
+ * iterate over the entire size of a premaster secret
+ * (SSL_MAX_MASTER_KEY_LENGTH). Reject overly short RSA keys because
+ * their ciphertext cannot accommodate a premaster secret anyway.
+ */
+ if (RSA_size(rsa) < SSL_MAX_MASTER_KEY_LENGTH) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_RSA,
+ RSA_R_KEY_SIZE_TOO_SMALL);
+ return 0;
+ }
+
+ rsa_decrypt = OPENSSL_malloc(RSA_size(rsa));
+ if (rsa_decrypt == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_RSA,
+ ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+
+ /*
+ * We must not leak whether a decryption failure occurs because of
+ * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246,
+ * section 7.4.7.1). The code follows that advice of the TLS RFC and
+ * generates a random premaster secret for the case that the decrypt
+ * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1
+ */
+
+ if (RAND_priv_bytes(rand_premaster_secret,
+ sizeof(rand_premaster_secret)) <= 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_RSA,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ /*
+ * Decrypt with no padding. PKCS#1 padding will be removed as part of
+ * the timing-sensitive code below.
+ */
+ /* TODO(size_t): Convert this function */
+ decrypt_len = (int)RSA_private_decrypt((int)PACKET_remaining(&enc_premaster),
+ PACKET_data(&enc_premaster),
+ rsa_decrypt, rsa, RSA_NO_PADDING);
+ if (decrypt_len < 0) {
+ SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_F_TLS_PROCESS_CKE_RSA,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ /* Check the padding. See RFC 3447, section 7.2.2. */
+
+ /*
+ * The smallest padded premaster is 11 bytes of overhead. Small keys
+ * are publicly invalid, so this may return immediately. This ensures
+ * PS is at least 8 bytes.
+ */
+ if (decrypt_len < 11 + SSL_MAX_MASTER_KEY_LENGTH) {
+ SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_F_TLS_PROCESS_CKE_RSA,
+ SSL_R_DECRYPTION_FAILED);
+ goto err;
+ }
+
+ padding_len = decrypt_len - SSL_MAX_MASTER_KEY_LENGTH;
+ decrypt_good = constant_time_eq_int_8(rsa_decrypt[0], 0) &
+ constant_time_eq_int_8(rsa_decrypt[1], 2);
+ for (j = 2; j < padding_len - 1; j++) {
+ decrypt_good &= ~constant_time_is_zero_8(rsa_decrypt[j]);
+ }
+ decrypt_good &= constant_time_is_zero_8(rsa_decrypt[padding_len - 1]);
+
+ /*
+ * If the version in the decrypted pre-master secret is correct then
+ * version_good will be 0xff, otherwise it'll be zero. The
+ * Klima-Pokorny-Rosa extension of Bleichenbacher's attack
+ * (http://eprint.iacr.org/2003/052/) exploits the version number
+ * check as a "bad version oracle". Thus version checks are done in
+ * constant time and are treated like any other decryption error.
+ */
+ version_good =
+ constant_time_eq_8(rsa_decrypt[padding_len],
+ (unsigned)(s->client_version >> 8));
+ version_good &=
+ constant_time_eq_8(rsa_decrypt[padding_len + 1],
+ (unsigned)(s->client_version & 0xff));
+
+ /*
+ * The premaster secret must contain the same version number as the
+ * ClientHello to detect version rollback attacks (strangely, the
+ * protocol does not offer such protection for DH ciphersuites).
+ * However, buggy clients exist that send the negotiated protocol
+ * version instead if the server does not support the requested
+ * protocol version. If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such
+ * clients.
+ */
+ if (s->options & SSL_OP_TLS_ROLLBACK_BUG) {
+ unsigned char workaround_good;
+ workaround_good = constant_time_eq_8(rsa_decrypt[padding_len],
+ (unsigned)(s->version >> 8));
+ workaround_good &=
+ constant_time_eq_8(rsa_decrypt[padding_len + 1],
+ (unsigned)(s->version & 0xff));
+ version_good |= workaround_good;
+ }
+
+ /*
+ * Both decryption and version must be good for decrypt_good to
+ * remain non-zero (0xff).
+ */
+ decrypt_good &= version_good;
+
+ /*
+ * Now copy rand_premaster_secret over from p using
+ * decrypt_good_mask. If decryption failed, then p does not
+ * contain valid plaintext, however, a check above guarantees
+ * it is still sufficiently large to read from.
+ */
+ for (j = 0; j < sizeof(rand_premaster_secret); j++) {
+ rsa_decrypt[padding_len + j] =
+ constant_time_select_8(decrypt_good,
+ rsa_decrypt[padding_len + j],
+ rand_premaster_secret[j]);
+ }
+
+ if (!ssl_generate_master_secret(s, rsa_decrypt + padding_len,
+ sizeof(rand_premaster_secret), 0)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+
+ ret = 1;
+ err:
+ OPENSSL_free(rsa_decrypt);
+ return ret;
+#else
+ /* Should never happen */
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_RSA,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
+#endif
+}
+
+static int tls_process_cke_dhe(SSL *s, PACKET *pkt)
+{
+#ifndef OPENSSL_NO_DH
+ EVP_PKEY *skey = NULL;
+ DH *cdh;
+ unsigned int i;
+ BIGNUM *pub_key;
+ const unsigned char *data;
+ EVP_PKEY *ckey = NULL;
+ int ret = 0;
+
+ if (!PACKET_get_net_2(pkt, &i) || PACKET_remaining(pkt) != i) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_DHE,
+ SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
+ goto err;
+ }
+ skey = s->s3->tmp.pkey;
+ if (skey == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_DHE,
+ SSL_R_MISSING_TMP_DH_KEY);
+ goto err;
+ }
+
+ if (PACKET_remaining(pkt) == 0L) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_DHE,
+ SSL_R_MISSING_TMP_DH_KEY);
+ goto err;
+ }
+ if (!PACKET_get_bytes(pkt, &data, i)) {
+ /* We already checked we have enough data */
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_DHE,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ ckey = EVP_PKEY_new();
+ if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) == 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_DHE,
+ SSL_R_BN_LIB);
+ goto err;
+ }
+
+ cdh = EVP_PKEY_get0_DH(ckey);
+ pub_key = BN_bin2bn(data, i, NULL);
+ if (pub_key == NULL || cdh == NULL || !DH_set0_key(cdh, pub_key, NULL)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_DHE,
+ ERR_R_INTERNAL_ERROR);
+ BN_free(pub_key);
+ goto err;
+ }
+
+ if (ssl_derive(s, skey, ckey, 1) == 0) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+
+ ret = 1;
+ EVP_PKEY_free(s->s3->tmp.pkey);
+ s->s3->tmp.pkey = NULL;
+ err:
+ EVP_PKEY_free(ckey);
+ return ret;
+#else
+ /* Should never happen */
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_DHE,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
+#endif
+}
+
+static int tls_process_cke_ecdhe(SSL *s, PACKET *pkt)
+{
+#ifndef OPENSSL_NO_EC
+ EVP_PKEY *skey = s->s3->tmp.pkey;
+ EVP_PKEY *ckey = NULL;
+ int ret = 0;
+
+ if (PACKET_remaining(pkt) == 0L) {
+ /* We don't support ECDH client auth */
+ SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS_PROCESS_CKE_ECDHE,
+ SSL_R_MISSING_TMP_ECDH_KEY);
+ goto err;
+ } else {
+ unsigned int i;
+ const unsigned char *data;
+
+ /*
+ * Get client's public key from encoded point in the
+ * ClientKeyExchange message.
+ */
+
+ /* Get encoded point length */
+ if (!PACKET_get_1(pkt, &i) || !PACKET_get_bytes(pkt, &data, i)
+ || PACKET_remaining(pkt) != 0) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_ECDHE,
+ SSL_R_LENGTH_MISMATCH);
+ goto err;
+ }
+ if (skey == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_ECDHE,
+ SSL_R_MISSING_TMP_ECDH_KEY);
+ goto err;
+ }
+
+ ckey = EVP_PKEY_new();
+ if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) <= 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_ECDHE,
+ ERR_R_EVP_LIB);
+ goto err;
+ }
+ if (EVP_PKEY_set1_tls_encodedpoint(ckey, data, i) == 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_ECDHE,
+ ERR_R_EC_LIB);
+ goto err;
+ }
+ }
+
+ if (ssl_derive(s, skey, ckey, 1) == 0) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+
+ ret = 1;
+ EVP_PKEY_free(s->s3->tmp.pkey);
+ s->s3->tmp.pkey = NULL;
+ err:
+ EVP_PKEY_free(ckey);
+
+ return ret;
+#else
+ /* Should never happen */
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_ECDHE,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
+#endif
+}
+
+static int tls_process_cke_srp(SSL *s, PACKET *pkt)
+{
+#ifndef OPENSSL_NO_SRP
+ unsigned int i;
+ const unsigned char *data;
+
+ if (!PACKET_get_net_2(pkt, &i)
+ || !PACKET_get_bytes(pkt, &data, i)) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_SRP,
+ SSL_R_BAD_SRP_A_LENGTH);
+ return 0;
+ }
+ if ((s->srp_ctx.A = BN_bin2bn(data, i, NULL)) == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_SRP,
+ ERR_R_BN_LIB);
+ return 0;
+ }
+ if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0 || BN_is_zero(s->srp_ctx.A)) {
+ SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PROCESS_CKE_SRP,
+ SSL_R_BAD_SRP_PARAMETERS);
+ return 0;
+ }
+ OPENSSL_free(s->session->srp_username);
+ s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login);
+ if (s->session->srp_username == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_SRP,
+ ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+
+ if (!srp_generate_server_master_secret(s)) {
+ /* SSLfatal() already called */
+ return 0;
+ }
+
+ return 1;
+#else
+ /* Should never happen */
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_SRP,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
+#endif
+}
+
+static int tls_process_cke_gost(SSL *s, PACKET *pkt)
+{
+#ifndef OPENSSL_NO_GOST
+ EVP_PKEY_CTX *pkey_ctx;
+ EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
+ unsigned char premaster_secret[32];
+ const unsigned char *start;
+ size_t outlen = 32, inlen;
+ unsigned long alg_a;
+ GOST_KX_MESSAGE *pKX = NULL;
+ const unsigned char *ptr;
+ int ret = 0;
+
+ /* Get our certificate private key */
+ alg_a = s->s3->tmp.new_cipher->algorithm_auth;
+ if (alg_a & SSL_aGOST12) {
+ /*
+ * New GOST ciphersuites have SSL_aGOST01 bit too
+ */
+ pk = s->cert->pkeys[SSL_PKEY_GOST12_512].privatekey;
+ if (pk == NULL) {
+ pk = s->cert->pkeys[SSL_PKEY_GOST12_256].privatekey;
+ }
+ if (pk == NULL) {
+ pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
+ }
+ } else if (alg_a & SSL_aGOST01) {
+ pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
+ }
+
+ pkey_ctx = EVP_PKEY_CTX_new(pk, NULL);
+ if (pkey_ctx == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_GOST,
+ ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_GOST,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+ /*
+ * If client certificate is present and is of the same type, maybe
+ * use it for key exchange. Don't mind errors from
+ * EVP_PKEY_derive_set_peer, because it is completely valid to use a
+ * client certificate for authorization only.
+ */
+ client_pub_pkey = X509_get0_pubkey(s->session->peer);
+ if (client_pub_pkey) {
+ if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
+ ERR_clear_error();
+ }
+
+ ptr = PACKET_data(pkt);
+ /* Some implementations provide extra data in the opaqueBlob
+ * We have nothing to do with this blob so we just skip it */
+ pKX = d2i_GOST_KX_MESSAGE(NULL, &ptr, PACKET_remaining(pkt));
+ if (pKX == NULL
+ || pKX->kxBlob == NULL
+ || ASN1_TYPE_get(pKX->kxBlob) != V_ASN1_SEQUENCE) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_GOST,
+ SSL_R_DECRYPTION_FAILED);
+ goto err;
+ }
+
+ if (!PACKET_forward(pkt, ptr - PACKET_data(pkt))) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_GOST,
+ SSL_R_DECRYPTION_FAILED);
+ goto err;
+ }
+
+ if (PACKET_remaining(pkt) != 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_GOST,
+ SSL_R_DECRYPTION_FAILED);
+ goto err;
+ }
+
+ inlen = pKX->kxBlob->value.sequence->length;
+ start = pKX->kxBlob->value.sequence->data;
+
+ if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen, start,
+ inlen) <= 0) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_GOST,
+ SSL_R_DECRYPTION_FAILED);
+ goto err;
+ }
+ /* Generate master secret */
+ if (!ssl_generate_master_secret(s, premaster_secret,
+ sizeof(premaster_secret), 0)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+ /* Check if pubkey from client certificate was used */
+ if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2,
+ NULL) > 0)
+ s->statem.no_cert_verify = 1;
+
+ ret = 1;
+ err:
+ EVP_PKEY_CTX_free(pkey_ctx);
+ GOST_KX_MESSAGE_free(pKX);
+ return ret;
+#else
+ /* Should never happen */
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_GOST,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
+#endif
+}
+
+MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt)
+{
+ unsigned long alg_k;
+
+ alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
+
+ /* For PSK parse and retrieve identity, obtain PSK key */
+ if ((alg_k & SSL_PSK) && !tls_process_cke_psk_preamble(s, pkt)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+
+ if (alg_k & SSL_kPSK) {
+ /* Identity extracted earlier: should be nothing left */
+ if (PACKET_remaining(pkt) != 0) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR,
+ SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
+ SSL_R_LENGTH_MISMATCH);
+ goto err;
+ }
+ /* PSK handled by ssl_generate_master_secret */
+ if (!ssl_generate_master_secret(s, NULL, 0, 0)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+ } else if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) {
+ if (!tls_process_cke_rsa(s, pkt)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+ } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) {
+ if (!tls_process_cke_dhe(s, pkt)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+ } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) {
+ if (!tls_process_cke_ecdhe(s, pkt)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+ } else if (alg_k & SSL_kSRP) {
+ if (!tls_process_cke_srp(s, pkt)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+ } else if (alg_k & SSL_kGOST) {
+ if (!tls_process_cke_gost(s, pkt)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+ } else {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
+ SSL_R_UNKNOWN_CIPHER_TYPE);
+ goto err;
+ }
+
+ return MSG_PROCESS_CONTINUE_PROCESSING;
+ err:
+#ifndef OPENSSL_NO_PSK
+ OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen);
+ s->s3->tmp.psk = NULL;
+ s->s3->tmp.psklen = 0;
+#endif
+ return MSG_PROCESS_ERROR;
+}
+
+WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst)
+{
+#ifndef OPENSSL_NO_SCTP
+ if (wst == WORK_MORE_A) {
+ if (SSL_IS_DTLS(s)) {
+ 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,
+ SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE,
+ 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 (s->statem.no_cert_verify || !s->session->peer) {
+ /*
+ * No certificate verify or no peer certificate so we no longer need
+ * the handshake_buffer
+ */
+ if (!ssl3_digest_cached_records(s, 0)) {
+ /* SSLfatal() already called */
+ return WORK_ERROR;
+ }
+ return WORK_FINISHED_CONTINUE;
+ } else {
+ if (!s->s3->handshake_buffer) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ return WORK_ERROR;
+ }
+ /*
+ * For sigalgs freeze the handshake buffer. If we support
+ * extms we've done this already so this is a no-op
+ */
+ if (!ssl3_digest_cached_records(s, 1)) {
+ /* SSLfatal() already called */
+ return WORK_ERROR;
+ }
+ }
+
+ return WORK_FINISHED_CONTINUE;
+}
+
+MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt)
+{
+ int i;
+ MSG_PROCESS_RETURN ret = MSG_PROCESS_ERROR;
+ X509 *x = NULL;
+ unsigned long l;
+ const unsigned char *certstart, *certbytes;
+ STACK_OF(X509) *sk = NULL;
+ PACKET spkt, context;
+ size_t chainidx;
+ SSL_SESSION *new_sess = NULL;
+
+ /*
+ * To get this far we must have read encrypted data from the client. We no
+ * longer tolerate unencrypted alerts. This value is ignored if less than
+ * TLSv1.3
+ */
+ s->statem.enc_read_state = ENC_READ_STATE_VALID;
+
+ if ((sk = sk_X509_new_null()) == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ if (SSL_IS_TLS13(s) && (!PACKET_get_length_prefixed_1(pkt, &context)
+ || (s->pha_context == NULL && PACKET_remaining(&context) != 0)
+ || (s->pha_context != NULL &&
+ !PACKET_equal(&context, s->pha_context, s->pha_context_len)))) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ SSL_R_INVALID_CONTEXT);
+ goto err;
+ }
+
+ if (!PACKET_get_length_prefixed_3(pkt, &spkt)
+ || PACKET_remaining(pkt) != 0) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ SSL_R_LENGTH_MISMATCH);
+ goto err;
+ }
+
+ for (chainidx = 0; PACKET_remaining(&spkt) > 0; chainidx++) {
+ if (!PACKET_get_net_3(&spkt, &l)
+ || !PACKET_get_bytes(&spkt, &certbytes, l)) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR,
+ SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ SSL_R_CERT_LENGTH_MISMATCH);
+ goto err;
+ }
+
+ certstart = certbytes;
+ x = d2i_X509(NULL, (const unsigned char **)&certbytes, l);
+ if (x == NULL) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR,
+ SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB);
+ goto err;
+ }
+ if (certbytes != (certstart + l)) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR,
+ SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ SSL_R_CERT_LENGTH_MISMATCH);
+ goto err;
+ }
+
+ if (SSL_IS_TLS13(s)) {
+ RAW_EXTENSION *rawexts = NULL;
+ PACKET extensions;
+
+ if (!PACKET_get_length_prefixed_2(&spkt, &extensions)) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR,
+ SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ SSL_R_BAD_LENGTH);
+ goto err;
+ }
+ if (!tls_collect_extensions(s, &extensions,
+ SSL_EXT_TLS1_3_CERTIFICATE, &rawexts,
+ NULL, chainidx == 0)
+ || !tls_parse_all_extensions(s, SSL_EXT_TLS1_3_CERTIFICATE,
+ rawexts, x, chainidx,
+ PACKET_remaining(&spkt) == 0)) {
+ OPENSSL_free(rawexts);
+ goto err;
+ }
+ OPENSSL_free(rawexts);
+ }
+
+ if (!sk_X509_push(sk, x)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ x = NULL;
+ }
+
+ if (sk_X509_num(sk) <= 0) {
+ /* TLS does not mind 0 certs returned */
+ if (s->version == SSL3_VERSION) {
+ SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
+ SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ SSL_R_NO_CERTIFICATES_RETURNED);
+ goto err;
+ }
+ /* Fail for TLS only if we required a certificate */
+ else if ((s->verify_mode & SSL_VERIFY_PEER) &&
+ (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
+ SSLfatal(s, SSL_AD_CERTIFICATE_REQUIRED,
+ SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
+ goto err;
+ }
+ /* No client certificate so digest cached records */
+ if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+ } else {
+ EVP_PKEY *pkey;
+ i = ssl_verify_cert_chain(s, sk);
+ if (i <= 0) {
+ SSLfatal(s, ssl_x509err2alert(s->verify_result),
+ SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ SSL_R_CERTIFICATE_VERIFY_FAILED);
+ goto err;
+ }
+ if (i > 1) {
+ SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
+ SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i);
+ goto err;
+ }
+ pkey = X509_get0_pubkey(sk_X509_value(sk, 0));
+ if (pkey == NULL) {
+ SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
+ SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ SSL_R_UNKNOWN_CERTIFICATE_TYPE);
+ goto err;
+ }
+ }
+
+ /*
+ * Sessions must be immutable once they go into the session cache. Otherwise
+ * we can get multi-thread problems. Therefore we don't "update" sessions,
+ * we replace them with a duplicate. Here, we need to do this every time
+ * a new certificate is received via post-handshake authentication, as the
+ * session may have already gone into the session cache.
+ */
+
+ if (s->post_handshake_auth == SSL_PHA_REQUESTED) {
+ if ((new_sess = ssl_session_dup(s->session, 0)) == 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ SSL_SESSION_free(s->session);
+ s->session = new_sess;
+ }
+
+ X509_free(s->session->peer);
+ s->session->peer = sk_X509_shift(sk);
+ s->session->verify_result = s->verify_result;
+
+ sk_X509_pop_free(s->session->peer_chain, X509_free);
+ s->session->peer_chain = sk;
+ sk = NULL;
+
+ /*
+ * Freeze the handshake buffer. For <TLS1.3 we do this after the CKE
+ * message
+ */
+ if (SSL_IS_TLS13(s) && !ssl3_digest_cached_records(s, 1)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+
+ /*
+ * Inconsistency alert: cert_chain does *not* include the peer's own
+ * certificate, while we do include it in statem_clnt.c
+ */
+
+ /* Save the current hash state for when we receive the CertificateVerify */
+ if (SSL_IS_TLS13(s)) {
+ if (!ssl_handshake_hash(s, s->cert_verify_hash,
+ sizeof(s->cert_verify_hash),
+ &s->cert_verify_hash_len)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+
+ /* Resend session tickets */
+ s->sent_tickets = 0;
+ }
+
+ ret = MSG_PROCESS_CONTINUE_READING;
+
+ err:
+ X509_free(x);
+ sk_X509_pop_free(sk, X509_free);
+ return ret;
+}
+
+int tls_construct_server_certificate(SSL *s, WPACKET *pkt)
+{
+ CERT_PKEY *cpk = s->s3->tmp.cert;
+
+ if (cpk == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+
+ /*
+ * In TLSv1.3 the certificate chain is always preceded by a 0 length context
+ * for the server Certificate message
+ */
+ if (SSL_IS_TLS13(s) && !WPACKET_put_bytes_u8(pkt, 0)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+ if (!ssl3_output_cert_chain(s, pkt, cpk)) {
+ /* SSLfatal() already called */
+ return 0;
+ }
+
+ return 1;
+}
+
+static int create_ticket_prequel(SSL *s, WPACKET *pkt, uint32_t age_add,
+ unsigned char *tick_nonce)
+{
+ uint32_t timeout = (uint32_t)s->session->timeout;
+
+ /*
+ * Ticket lifetime hint:
+ * In TLSv1.3 we reset the "time" field above, and always specify the
+ * timeout, limited to a 1 week period per RFC8446.
+ * For TLSv1.2 this is advisory only and we leave this unspecified for
+ * resumed session (for simplicity).
+ */
+#define ONE_WEEK_SEC (7 * 24 * 60 * 60)
+
+ if (SSL_IS_TLS13(s)) {
+ if (s->session->timeout > ONE_WEEK_SEC)
+ timeout = ONE_WEEK_SEC;
+ } else if (s->hit)
+ timeout = 0;
+
+ if (!WPACKET_put_bytes_u32(pkt, timeout)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CREATE_TICKET_PREQUEL,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+
+ if (SSL_IS_TLS13(s)) {
+ if (!WPACKET_put_bytes_u32(pkt, age_add)
+ || !WPACKET_sub_memcpy_u8(pkt, tick_nonce, TICKET_NONCE_SIZE)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CREATE_TICKET_PREQUEL,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+ }
+
+ /* Start the sub-packet for the actual ticket data */
+ if (!WPACKET_start_sub_packet_u16(pkt)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CREATE_TICKET_PREQUEL,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+
+ return 1;
+}
+
+static int construct_stateless_ticket(SSL *s, WPACKET *pkt, uint32_t age_add,
+ unsigned char *tick_nonce)
+{
+ unsigned char *senc = NULL;
+ EVP_CIPHER_CTX *ctx = NULL;
+ HMAC_CTX *hctx = NULL;
+ unsigned char *p, *encdata1, *encdata2, *macdata1, *macdata2;
+ const unsigned char *const_p;
+ int len, slen_full, slen, lenfinal;
+ SSL_SESSION *sess;
+ unsigned int hlen;
+ SSL_CTX *tctx = s->session_ctx;
+ unsigned char iv[EVP_MAX_IV_LENGTH];
+ unsigned char key_name[TLSEXT_KEYNAME_LENGTH];
+ int iv_len, ok = 0;
+ size_t macoffset, macendoffset;
+
+ /* get session encoding length */
+ slen_full = i2d_SSL_SESSION(s->session, NULL);
+ /*
+ * Some length values are 16 bits, so forget it if session is too
+ * long
+ */
+ if (slen_full == 0 || slen_full > 0xFF00) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ senc = OPENSSL_malloc(slen_full);
+ if (senc == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_CONSTRUCT_STATELESS_TICKET, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ ctx = EVP_CIPHER_CTX_new();
+ hctx = HMAC_CTX_new();
+ if (ctx == NULL || hctx == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
+ ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ p = senc;
+ if (!i2d_SSL_SESSION(s->session, &p)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ /*
+ * create a fresh copy (not shared with other threads) to clean up
+ */
+ const_p = senc;
+ sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
+ if (sess == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ slen = i2d_SSL_SESSION(sess, NULL);
+ if (slen == 0 || slen > slen_full) {
+ /* shouldn't ever happen */
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
+ ERR_R_INTERNAL_ERROR);
+ SSL_SESSION_free(sess);
+ goto err;
+ }
+ p = senc;
+ if (!i2d_SSL_SESSION(sess, &p)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
+ ERR_R_INTERNAL_ERROR);
+ SSL_SESSION_free(sess);
+ goto err;
+ }
+ SSL_SESSION_free(sess);
+
+ /*
+ * Initialize HMAC and cipher contexts. If callback present it does
+ * all the work otherwise use generated values from parent ctx.
+ */
+ if (tctx->ext.ticket_key_cb) {
+ /* if 0 is returned, write an empty ticket */
+ int ret = tctx->ext.ticket_key_cb(s, key_name, iv, ctx,
+ hctx, 1);
+
+ if (ret == 0) {
+
+ /* Put timeout and length */
+ if (!WPACKET_put_bytes_u32(pkt, 0)
+ || !WPACKET_put_bytes_u16(pkt, 0)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_CONSTRUCT_STATELESS_TICKET,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ OPENSSL_free(senc);
+ EVP_CIPHER_CTX_free(ctx);
+ HMAC_CTX_free(hctx);
+ return 1;
+ }
+ if (ret < 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
+ SSL_R_CALLBACK_FAILED);
+ goto err;
+ }
+ iv_len = EVP_CIPHER_CTX_iv_length(ctx);
+ } else {
+ const EVP_CIPHER *cipher = EVP_aes_256_cbc();
+
+ iv_len = EVP_CIPHER_iv_length(cipher);
+ if (RAND_bytes(iv, iv_len) <= 0
+ || !EVP_EncryptInit_ex(ctx, cipher, NULL,
+ tctx->ext.secure->tick_aes_key, iv)
+ || !HMAC_Init_ex(hctx, tctx->ext.secure->tick_hmac_key,
+ sizeof(tctx->ext.secure->tick_hmac_key),
+ EVP_sha256(), NULL)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ memcpy(key_name, tctx->ext.tick_key_name,
+ sizeof(tctx->ext.tick_key_name));
+ }
+
+ if (!create_ticket_prequel(s, pkt, age_add, tick_nonce)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+
+ if (!WPACKET_get_total_written(pkt, &macoffset)
+ /* Output key name */
+ || !WPACKET_memcpy(pkt, key_name, sizeof(key_name))
+ /* output IV */
+ || !WPACKET_memcpy(pkt, iv, iv_len)
+ || !WPACKET_reserve_bytes(pkt, slen + EVP_MAX_BLOCK_LENGTH,
+ &encdata1)
+ /* Encrypt session data */
+ || !EVP_EncryptUpdate(ctx, encdata1, &len, senc, slen)
+ || !WPACKET_allocate_bytes(pkt, len, &encdata2)
+ || encdata1 != encdata2
+ || !EVP_EncryptFinal(ctx, encdata1 + len, &lenfinal)
+ || !WPACKET_allocate_bytes(pkt, lenfinal, &encdata2)
+ || encdata1 + len != encdata2
+ || len + lenfinal > slen + EVP_MAX_BLOCK_LENGTH
+ || !WPACKET_get_total_written(pkt, &macendoffset)
+ || !HMAC_Update(hctx,
+ (unsigned char *)s->init_buf->data + macoffset,
+ macendoffset - macoffset)
+ || !WPACKET_reserve_bytes(pkt, EVP_MAX_MD_SIZE, &macdata1)
+ || !HMAC_Final(hctx, macdata1, &hlen)
+ || hlen > EVP_MAX_MD_SIZE
+ || !WPACKET_allocate_bytes(pkt, hlen, &macdata2)
+ || macdata1 != macdata2) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_CONSTRUCT_STATELESS_TICKET, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ /* Close the sub-packet created by create_ticket_prequel() */
+ if (!WPACKET_close(pkt)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ ok = 1;
+ err:
+ OPENSSL_free(senc);
+ EVP_CIPHER_CTX_free(ctx);
+ HMAC_CTX_free(hctx);
+ return ok;
+}
+
+static int construct_stateful_ticket(SSL *s, WPACKET *pkt, uint32_t age_add,
+ unsigned char *tick_nonce)
+{
+ if (!create_ticket_prequel(s, pkt, age_add, tick_nonce)) {
+ /* SSLfatal() already called */
+ return 0;
+ }
+
+ if (!WPACKET_memcpy(pkt, s->session->session_id,
+ s->session->session_id_length)
+ || !WPACKET_close(pkt)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATEFUL_TICKET,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+
+ return 1;
+}
+
+int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt)
+{
+ SSL_CTX *tctx = s->session_ctx;
+ unsigned char tick_nonce[TICKET_NONCE_SIZE];
+ union {
+ unsigned char age_add_c[sizeof(uint32_t)];
+ uint32_t age_add;
+ } age_add_u;
+
+ age_add_u.age_add = 0;
+
+ if (SSL_IS_TLS13(s)) {
+ size_t i, hashlen;
+ uint64_t nonce;
+ static const unsigned char nonce_label[] = "resumption";
+ const EVP_MD *md = ssl_handshake_md(s);
+ int hashleni = EVP_MD_size(md);
+
+ /* Ensure cast to size_t is safe */
+ if (!ossl_assert(hashleni >= 0)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ hashlen = (size_t)hashleni;
+
+ /*
+ * If we already sent one NewSessionTicket, or we resumed then
+ * s->session may already be in a cache and so we must not modify it.
+ * Instead we need to take a copy of it and modify that.
+ */
+ if (s->sent_tickets != 0 || s->hit) {
+ SSL_SESSION *new_sess = ssl_session_dup(s->session, 0);
+
+ if (new_sess == NULL) {
+ /* SSLfatal already called */
+ goto err;
+ }
+
+ SSL_SESSION_free(s->session);
+ s->session = new_sess;
+ }
+
+ if (!ssl_generate_session_id(s, s->session)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+ if (RAND_bytes(age_add_u.age_add_c, sizeof(age_add_u)) <= 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ s->session->ext.tick_age_add = age_add_u.age_add;
+
+ nonce = s->next_ticket_nonce;
+ for (i = TICKET_NONCE_SIZE; i > 0; i--) {
+ tick_nonce[i - 1] = (unsigned char)(nonce & 0xff);
+ nonce >>= 8;
+ }
+
+ if (!tls13_hkdf_expand(s, md, s->resumption_master_secret,
+ nonce_label,
+ sizeof(nonce_label) - 1,
+ tick_nonce,
+ TICKET_NONCE_SIZE,
+ s->session->master_key,
+ hashlen, 1)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+ s->session->master_key_length = hashlen;
+
+ s->session->time = (long)time(NULL);
+ if (s->s3->alpn_selected != NULL) {
+ OPENSSL_free(s->session->ext.alpn_selected);
+ s->session->ext.alpn_selected =
+ OPENSSL_memdup(s->s3->alpn_selected, s->s3->alpn_selected_len);
+ if (s->session->ext.alpn_selected == NULL) {
+ s->session->ext.alpn_selected_len = 0;
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET,
+ ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ s->session->ext.alpn_selected_len = s->s3->alpn_selected_len;
+ }
+ s->session->ext.max_early_data = s->max_early_data;
+ }
+
+ if (tctx->generate_ticket_cb != NULL &&
+ tctx->generate_ticket_cb(s, tctx->ticket_cb_data) == 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ /*
+ * If we are using anti-replay protection then we behave as if
+ * SSL_OP_NO_TICKET is set - we are caching tickets anyway so there
+ * is no point in using full stateless tickets.
+ */
+ if (SSL_IS_TLS13(s)
+ && ((s->options & SSL_OP_NO_TICKET) != 0
+ || (s->max_early_data > 0
+ && (s->options & SSL_OP_NO_ANTI_REPLAY) == 0))) {
+ if (!construct_stateful_ticket(s, pkt, age_add_u.age_add, tick_nonce)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+ } else if (!construct_stateless_ticket(s, pkt, age_add_u.age_add,
+ tick_nonce)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+
+ if (SSL_IS_TLS13(s)) {
+ if (!tls_construct_extensions(s, pkt,
+ SSL_EXT_TLS1_3_NEW_SESSION_TICKET,
+ NULL, 0)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+ /*
+ * Increment both |sent_tickets| and |next_ticket_nonce|. |sent_tickets|
+ * gets reset to 0 if we send more tickets following a post-handshake
+ * auth, but |next_ticket_nonce| does not.
+ */
+ s->sent_tickets++;
+ s->next_ticket_nonce++;
+ ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
+ }
+
+ return 1;
+ err:
+ return 0;
+}
+
+/*
+ * In TLSv1.3 this is called from the extensions code, otherwise it is used to
+ * create a separate message. Returns 1 on success or 0 on failure.
+ */
+int tls_construct_cert_status_body(SSL *s, WPACKET *pkt)
+{
+ if (!WPACKET_put_bytes_u8(pkt, s->ext.status_type)
+ || !WPACKET_sub_memcpy_u24(pkt, s->ext.ocsp.resp,
+ s->ext.ocsp.resp_len)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_STATUS_BODY,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+
+ return 1;
+}
+
+int tls_construct_cert_status(SSL *s, WPACKET *pkt)
+{
+ if (!tls_construct_cert_status_body(s, pkt)) {
+ /* SSLfatal() already called */
+ return 0;
+ }
+
+ return 1;
+}
+
+#ifndef OPENSSL_NO_NEXTPROTONEG
+/*
+ * tls_process_next_proto reads a Next Protocol Negotiation handshake message.
+ * It sets the next_proto member in s if found
+ */
+MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt)
+{
+ PACKET next_proto, padding;
+ size_t next_proto_len;
+
+ /*-
+ * The payload looks like:
+ * uint8 proto_len;
+ * uint8 proto[proto_len];
+ * uint8 padding_len;
+ * uint8 padding[padding_len];
+ */
+ if (!PACKET_get_length_prefixed_1(pkt, &next_proto)
+ || !PACKET_get_length_prefixed_1(pkt, &padding)
+ || PACKET_remaining(pkt) > 0) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_NEXT_PROTO,
+ SSL_R_LENGTH_MISMATCH);
+ return MSG_PROCESS_ERROR;
+ }
+
+ if (!PACKET_memdup(&next_proto, &s->ext.npn, &next_proto_len)) {
+ s->ext.npn_len = 0;
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_NEXT_PROTO,
+ ERR_R_INTERNAL_ERROR);
+ return MSG_PROCESS_ERROR;
+ }
+
+ s->ext.npn_len = (unsigned char)next_proto_len;
+
+ return MSG_PROCESS_CONTINUE_READING;
+}
+#endif
+
+static int tls_construct_encrypted_extensions(SSL *s, WPACKET *pkt)
+{
+ if (!tls_construct_extensions(s, pkt, SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
+ NULL, 0)) {
+ /* SSLfatal() already called */
+ return 0;
+ }
+
+ return 1;
+}
+
+MSG_PROCESS_RETURN tls_process_end_of_early_data(SSL *s, PACKET *pkt)
+{
+ if (PACKET_remaining(pkt) != 0) {
+ SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_END_OF_EARLY_DATA,
+ SSL_R_LENGTH_MISMATCH);
+ return MSG_PROCESS_ERROR;
+ }
+
+ if (s->early_data_state != SSL_EARLY_DATA_READING
+ && s->early_data_state != SSL_EARLY_DATA_READ_RETRY) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_END_OF_EARLY_DATA,
+ ERR_R_INTERNAL_ERROR);
+ return MSG_PROCESS_ERROR;
+ }
+
+ /*
+ * EndOfEarlyData signals a key change so the end of the message must be on
+ * a record boundary.
+ */
+ if (RECORD_LAYER_processed_read_pending(&s->rlayer)) {
+ SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE,
+ SSL_F_TLS_PROCESS_END_OF_EARLY_DATA,
+ SSL_R_NOT_ON_RECORD_BOUNDARY);
+ return MSG_PROCESS_ERROR;
+ }
+
+ s->early_data_state = SSL_EARLY_DATA_FINISHED_READING;
+ if (!s->method->ssl3_enc->change_cipher_state(s,
+ SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_SERVER_READ)) {
+ /* SSLfatal() already called */
+ return MSG_PROCESS_ERROR;
+ }
+
+ return MSG_PROCESS_CONTINUE_READING;
+}