--- /dev/null
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+/* ====================================================================
+ * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
+ *
+ * Portions of the attached software ("Contribution") are developed by
+ * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
+ *
+ * The Contribution is licensed pursuant to the OpenSSL open source
+ * license provided above.
+ *
+ * ECC cipher suite support in OpenSSL originally written by
+ * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
+ *
+ */
+/* ====================================================================
+ * Copyright 2005 Nokia. All rights reserved.
+ *
+ * The portions of the attached software ("Contribution") is developed by
+ * Nokia Corporation and is licensed pursuant to the OpenSSL open source
+ * license.
+ *
+ * The Contribution, originally written by Mika Kousa and Pasi Eronen of
+ * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
+ * support (see RFC 4279) to OpenSSL.
+ *
+ * No patent licenses or other rights except those expressly stated in
+ * the OpenSSL open source license shall be deemed granted or received
+ * expressly, by implication, estoppel, or otherwise.
+ *
+ * No assurances are provided by Nokia that the Contribution does not
+ * infringe the patent or other intellectual property rights of any third
+ * party or that the license provides you with all the necessary rights
+ * to make use of the Contribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
+ * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
+ * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
+ * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
+ * OTHERWISE.
+ */
+
+#include <stdio.h>
+#include "../ssl_locl.h"
+#include "statem_locl.h"
+#include "internal/constant_time_locl.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>
+
+static STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,
+ PACKET *cipher_suites,
+ STACK_OF(SSL_CIPHER)
+ **skp, int sslv2format,
+ int *al);
+
+/*
+ * 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|.
+ *
+ * Valid return values are:
+ * 1: Success (transition allowed)
+ * 0: Error (transition not allowed)
+ */
+int ossl_statem_server_read_transition(SSL *s, int mt)
+{
+ OSSL_STATEM *st = &s->statem;
+
+ switch (st->hand_state) {
+ case TLS_ST_BEFORE:
+ 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.
+ */
+ ssl3_send_alert(s, SSL3_AL_FATAL,
+ SSL3_AD_HANDSHAKE_FAILURE);
+ SSLerr(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->next_proto_neg_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;
+
+ default:
+ break;
+ }
+
+ /* No valid transition found */
+ ssl3_send_alert(s, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE);
+ SSLerr(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
+ */
+static int send_certificate_request(SSL *s)
+{
+ if (
+ /* don't request cert unless asked for it: */
+ s->verify_mode & SSL_VERIFY_PEER
+ /*
+ * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
+ * during re-negotiation:
+ */
+ && ((s->session->peer == NULL) ||
+ !(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;
+}
+
+/*
+ * 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;
+
+ switch (st->hand_state) {
+ case TLS_ST_BEFORE:
+ /* Just go straight to trying to read from the client */
+ return WRITE_TRAN_FINISHED;
+
+ case TLS_ST_OK:
+ /* We must be trying to renegotiate */
+ st->hand_state = TLS_ST_SW_HELLO_REQ;
+ return WRITE_TRAN_CONTINUE;
+
+ case TLS_ST_SW_HELLO_REQ:
+ st->hand_state = TLS_ST_OK;
+ ossl_statem_set_in_init(s, 0);
+ 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
+ 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->tlsext_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->tlsext_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;
+ ossl_statem_set_in_init(s, 0);
+ return WRITE_TRAN_CONTINUE;
+ } else if (s->tlsext_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;
+ ossl_statem_set_in_init(s, 0);
+ return WRITE_TRAN_CONTINUE;
+
+ default:
+ /* Shouldn't happen */
+ return WRITE_TRAN_ERROR;
+ }
+}
+
+/*
+ * 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) {
+ 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 bufferred 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)))
+ return dtls_wait_for_dry(s);
+#endif
+ return WORK_FINISHED_CONTINUE;
+
+ case TLS_ST_SW_SESSION_TICKET:
+ 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:
+ s->session->cipher = s->s3->tmp.new_cipher;
+ if (!s->method->ssl3_enc->setup_key_block(s)) {
+ ossl_statem_set_error(s);
+ 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_OK:
+ return tls_finish_handshake(s, wst);
+
+ default:
+ /* No pre work to be done */
+ break;
+ }
+
+ return WORK_FINISHED_CONTINUE;
+}
+
+/*
+ * 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) {
+ case TLS_ST_SW_HELLO_REQ:
+ if (statem_flush(s) != 1)
+ return WORK_MORE_A;
+ if (!ssl3_init_finished_mac(s)) {
+ ossl_statem_set_error(s);
+ 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)) {
+ ossl_statem_set_error(s);
+ 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:
+#ifndef OPENSSL_NO_SCTP
+ if (SSL_IS_DTLS(s) && s->hit) {
+ unsigned char sctpauthkey[64];
+ char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
+
+ /*
+ * Add new shared key for SCTP-Auth, will be ignored if no
+ * SCTP used.
+ */
+ memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
+ sizeof(DTLS1_SCTP_AUTH_LABEL));
+
+ if (SSL_export_keying_material(s, sctpauthkey,
+ sizeof(sctpauthkey), labelbuffer,
+ sizeof(labelbuffer), NULL, 0,
+ 0) <= 0) {
+ ossl_statem_set_error(s);
+ return WORK_ERROR;
+ }
+
+ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
+ sizeof(sctpauthkey), sctpauthkey);
+ }
+#endif
+ break;
+
+ case TLS_ST_SW_CHANGE:
+#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))
+ {
+ ossl_statem_set_error(s);
+ 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
+ break;
+
+ default:
+ /* No post work to be done */
+ break;
+ }
+
+ return WORK_FINISHED_CONTINUE;
+}
+
+/*
+ * Construct a message to be sent from the server to the client.
+ *
+ * Valid return values are:
+ * 1: Success
+ * 0: Error
+ */
+int ossl_statem_server_construct_message(SSL *s)
+{
+ OSSL_STATEM *st = &s->statem;
+
+ switch (st->hand_state) {
+ case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
+ return dtls_construct_hello_verify_request(s);
+
+ case TLS_ST_SW_HELLO_REQ:
+ return tls_construct_hello_request(s);
+
+ case TLS_ST_SW_SRVR_HELLO:
+ return tls_construct_server_hello(s);
+
+ case TLS_ST_SW_CERT:
+ return tls_construct_server_certificate(s);
+
+ case TLS_ST_SW_KEY_EXCH:
+ return tls_construct_server_key_exchange(s);
+
+ case TLS_ST_SW_CERT_REQ:
+ return tls_construct_certificate_request(s);
+
+ case TLS_ST_SW_SRVR_DONE:
+ return tls_construct_server_done(s);
+
+ case TLS_ST_SW_SESSION_TICKET:
+ return tls_construct_new_session_ticket(s);
+
+ case TLS_ST_SW_CERT_STATUS:
+ return tls_construct_cert_status(s);
+
+ case TLS_ST_SW_CHANGE:
+ if (SSL_IS_DTLS(s))
+ return dtls_construct_change_cipher_spec(s);
+ else
+ return tls_construct_change_cipher_spec(s);
+
+ case TLS_ST_SW_FINISHED:
+ return tls_construct_finished(s,
+ s->method->
+ ssl3_enc->server_finished_label,
+ s->method->
+ ssl3_enc->server_finished_label_len);
+
+ default:
+ /* Shouldn't happen */
+ break;
+ }
+
+ return 0;
+}
+
+/*
+ * 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.
+ */
+unsigned long ossl_statem_server_max_message_size(SSL *s)
+{
+ OSSL_STATEM *st = &s->statem;
+
+ switch (st->hand_state) {
+ case TLS_ST_SR_CLNT_HELLO:
+ return CLIENT_HELLO_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;
+
+ default:
+ /* Shouldn't happen */
+ break;
+ }
+
+ return 0;
+}
+
+/*
+ * 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) {
+ case TLS_ST_SR_CLNT_HELLO:
+ return tls_process_client_hello(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);
+
+ default:
+ /* Shouldn't happen */
+ break;
+ }
+
+ return MSG_PROCESS_ERROR;
+}
+
+/*
+ * 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) {
+ 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);
+
+ case TLS_ST_SR_CERT_VRFY:
+#ifndef OPENSSL_NO_SCTP
+ if ( /* Is this SCTP? */
+ BIO_dgram_is_sctp(SSL_get_wbio(s))
+ /* Are we renegotiating? */
+ && s->renegotiate && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
+ s->s3->in_read_app_data = 2;
+ s->rwstate = SSL_READING;
+ BIO_clear_retry_flags(SSL_get_rbio(s));
+ BIO_set_retry_read(SSL_get_rbio(s));
+ ossl_statem_set_sctp_read_sock(s, 1);
+ return WORK_MORE_A;
+ } else {
+ ossl_statem_set_sctp_read_sock(s, 0);
+ }
+#endif
+ return WORK_FINISHED_CONTINUE;
+
+ default:
+ break;
+ }
+
+ /* Shouldn't happen */
+ return WORK_ERROR;
+}
+
+#ifndef OPENSSL_NO_SRP
+static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
+{
+ int ret = SSL_ERROR_NONE;
+
+ *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
+ */
+ ret = SSL3_AL_FATAL;
+ *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
+ } else {
+ ret = SSL_srp_server_param_with_username(s, al);
+ }
+ }
+ return ret;
+}
+#endif
+
+int tls_construct_hello_request(SSL *s)
+{
+ if (!ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0)) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_HELLO_REQUEST, ERR_R_INTERNAL_ERROR);
+ ossl_statem_set_error(s);
+ return 0;
+ }
+
+ return 1;
+}
+
+unsigned int dtls_raw_hello_verify_request(unsigned char *buf,
+ unsigned char *cookie,
+ unsigned char cookie_len)
+{
+ unsigned int msg_len;
+ unsigned char *p;
+
+ p = buf;
+ /* Always use DTLS 1.0 version: see RFC 6347 */
+ *(p++) = DTLS1_VERSION >> 8;
+ *(p++) = DTLS1_VERSION & 0xFF;
+
+ *(p++) = (unsigned char)cookie_len;
+ memcpy(p, cookie, cookie_len);
+ p += cookie_len;
+ msg_len = p - buf;
+
+ return msg_len;
+}
+
+int dtls_construct_hello_verify_request(SSL *s)
+{
+ unsigned int len;
+ unsigned char *buf;
+
+ buf = (unsigned char *)s->init_buf->data;
+
+ if (s->ctx->app_gen_cookie_cb == NULL ||
+ s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
+ &(s->d1->cookie_len)) == 0 ||
+ s->d1->cookie_len > 255) {
+ SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST,
+ SSL_R_COOKIE_GEN_CALLBACK_FAILURE);
+ ossl_statem_set_error(s);
+ return 0;
+ }
+
+ len = dtls_raw_hello_verify_request(&buf[DTLS1_HM_HEADER_LENGTH],
+ s->d1->cookie, s->d1->cookie_len);
+
+ dtls1_set_message_header(s, DTLS1_MT_HELLO_VERIFY_REQUEST, len, 0, len);
+ len += DTLS1_HM_HEADER_LENGTH;
+
+ /* number of bytes to write */
+ s->init_num = len;
+ s->init_off = 0;
+
+ return 1;
+}
+
+MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt)
+{
+ int i, al = SSL_AD_INTERNAL_ERROR;
+ unsigned int j, complen = 0;
+ unsigned long id;
+ const SSL_CIPHER *c;
+#ifndef OPENSSL_NO_COMP
+ SSL_COMP *comp = NULL;
+#endif
+ STACK_OF(SSL_CIPHER) *ciphers = NULL;
+ int protverr;
+ /* |cookie| will only be initialized for DTLS. */
+ PACKET session_id, cipher_suites, compression, extensions, cookie;
+ int is_v2_record;
+ static const unsigned char null_compression = 0;
+
+ is_v2_record = RECORD_LAYER_is_sslv2_record(&s->rlayer);
+
+ PACKET_null_init(&cookie);
+ /* First lets get s->client_version set correctly */
+ if (is_v2_record) {
+ unsigned int version;
+ unsigned int mt;
+ /*-
+ * 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
+ */
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ if (!PACKET_get_net_2(pkt, &version)) {
+ /* No protocol version supplied! */
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
+ goto err;
+ }
+ if (version == 0x0002) {
+ /* This is real SSLv2. We don't support it. */
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
+ goto err;
+ } else if ((version & 0xff00) == (SSL3_VERSION_MAJOR << 8)) {
+ /* SSLv3/TLS */
+ s->client_version = version;
+ } else {
+ /* No idea what protocol this is */
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
+ goto err;
+ }
+ } else {
+ /*
+ * use version from inside client hello, not from record header (may
+ * differ: see RFC 2246, Appendix E, second paragraph)
+ */
+ if (!PACKET_get_net_2(pkt, (unsigned int *)&s->client_version)) {
+ al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
+ goto f_err;
+ }
+ }
+
+ /*
+ * 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);
+ } else if (s->method->version != DTLS_ANY_VERSION &&
+ DTLS_VERSION_LT(s->client_version, s->version)) {
+ protverr = SSL_R_VERSION_TOO_LOW;
+ } else {
+ protverr = 0;
+ }
+
+ if (protverr) {
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr);
+ if ((!s->enc_write_ctx && !s->write_hash)) {
+ /*
+ * similar to ssl3_get_record, send alert using remote version
+ * number
+ */
+ s->version = s->client_version;
+ }
+ al = SSL_AD_PROTOCOL_VERSION;
+ goto f_err;
+ }
+
+ /* Parse the message and load client random. */
+ if (is_v2_record) {
+ /*
+ * 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 above.
+ */
+ unsigned int cipher_len, session_id_len, challenge_len;
+ PACKET challenge;
+
+ if (!PACKET_get_net_2(pkt, &cipher_len)
+ || !PACKET_get_net_2(pkt, &session_id_len)
+ || !PACKET_get_net_2(pkt, &challenge_len)) {
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
+ SSL_R_RECORD_LENGTH_MISMATCH);
+ al = SSL_AD_DECODE_ERROR;
+ goto f_err;
+ }
+
+ if (session_id_len > SSL_MAX_SSL_SESSION_ID_LENGTH) {
+ al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
+ goto f_err;
+ }
+
+ if (!PACKET_get_sub_packet(pkt, &cipher_suites, cipher_len)
+ || !PACKET_get_sub_packet(pkt, &session_id, session_id_len)
+ || !PACKET_get_sub_packet(pkt, &challenge, challenge_len)
+ /* No extensions. */
+ || PACKET_remaining(pkt) != 0) {
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
+ SSL_R_RECORD_LENGTH_MISMATCH);
+ al = SSL_AD_DECODE_ERROR;
+ goto f_err;
+ }
+
+ /* Load the client random and compression list. */
+ challenge_len = challenge_len > SSL3_RANDOM_SIZE ? SSL3_RANDOM_SIZE :
+ challenge_len;
+ memset(s->s3->client_random, 0, SSL3_RANDOM_SIZE);
+ if (!PACKET_copy_bytes(&challenge,
+ s->s3->client_random + SSL3_RANDOM_SIZE -
+ challenge_len, challenge_len)
+ /* Advertise only null compression. */
+ || !PACKET_buf_init(&compression, &null_compression, 1)) {
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
+ al = SSL_AD_INTERNAL_ERROR;
+ goto f_err;
+ }
+
+ PACKET_null_init(&extensions);
+ } else {
+ /* Regular ClientHello. */
+ if (!PACKET_copy_bytes(pkt, s->s3->client_random, SSL3_RANDOM_SIZE)
+ || !PACKET_get_length_prefixed_1(pkt, &session_id)) {
+ al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
+ goto f_err;
+ }
+
+ if (PACKET_remaining(&session_id) > SSL_MAX_SSL_SESSION_ID_LENGTH) {
+ al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
+ goto f_err;
+ }
+
+ if (SSL_IS_DTLS(s)) {
+ if (!PACKET_get_length_prefixed_1(pkt, &cookie)) {
+ al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
+ goto f_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 (PACKET_remaining(&cookie) == 0)
+ return 1;
+ }
+ }
+
+ if (!PACKET_get_length_prefixed_2(pkt, &cipher_suites)
+ || !PACKET_get_length_prefixed_1(pkt, &compression)) {
+ al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
+ goto f_err;
+ }
+ /* Could be empty. */
+ extensions = *pkt;
+ }
+
+ 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, PACKET_data(&cookie),
+ PACKET_remaining(&cookie)) ==
+ 0) {
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
+ SSL_R_COOKIE_MISMATCH);
+ goto f_err;
+ /* else cookie verification succeeded */
+ }
+ /* default verification */
+ } else if (!PACKET_equal(&cookie, s->d1->cookie, s->d1->cookie_len)) {
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
+ goto f_err;
+ }
+ s->d1->cookie_verified = 1;
+ }
+ if (s->method->version == DTLS_ANY_VERSION) {
+ protverr = ssl_choose_server_version(s);
+ if (protverr != 0) {
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr);
+ s->version = s->client_version;
+ al = SSL_AD_PROTOCOL_VERSION;
+ goto f_err;
+ }
+ }
+ }
+
+ s->hit = 0;
+
+ /*
+ * 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 (is_v2_record ||
+ (s->new_session &&
+ (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) {
+ if (!ssl_get_new_session(s, 1))
+ goto err;
+ } else {
+ i = ssl_get_prev_session(s, &extensions, &session_id);
+ /*
+ * Only resume if the session's version matches the negotiated
+ * version.
+ * RFC 5246 does not provide much useful advice on resumption
+ * with a different protocol version. It doesn't forbid it but
+ * the sanity of such behaviour would be questionable.
+ * In practice, clients do not accept a version mismatch and
+ * will abort the handshake with an error.
+ */
+ if (i == 1 && s->version == s->session->ssl_version) {
+ /* previous session */
+ s->hit = 1;
+ } else if (i == -1) {
+ goto err;
+ } else {
+ /* i == 0 */
+ if (!ssl_get_new_session(s, 1))
+ goto err;
+ }
+ }
+
+ if (ssl_bytes_to_cipher_list(s, &cipher_suites, &(ciphers),
+ is_v2_record, &al) == NULL) {
+ goto f_err;
+ }
+
+ /* If it is a hit, check that the cipher is in the list */
+ if (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
+ */
+ al = SSL_AD_ILLEGAL_PARAMETER;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
+ SSL_R_REQUIRED_CIPHER_MISSING);
+ goto f_err;
+ }
+ }
+
+ complen = PACKET_remaining(&compression);
+ for (j = 0; j < complen; j++) {
+ if (PACKET_data(&compression)[j] == 0)
+ break;
+ }
+
+ if (j >= complen) {
+ /* no compress */
+ al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_COMPRESSION_SPECIFIED);
+ goto f_err;
+ }
+
+ /* TLS extensions */
+ if (s->version >= SSL3_VERSION) {
+ if (!ssl_parse_clienthello_tlsext(s, &extensions)) {
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_PARSE_TLSEXT);
+ goto err;
+ }
+ }
+
+ /*
+ * Check if we want to use external pre-shared secret for this handshake
+ * for not reused session only. We need to generate server_random before
+ * calling tls_session_secret_cb in order to allow SessionTicket
+ * processing to use it in key derivation.
+ */
+ {
+ unsigned char *pos;
+ pos = s->s3->server_random;
+ if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0) {
+ goto f_err;
+ }
+ }
+
+ if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb) {
+ const SSL_CIPHER *pref_cipher = NULL;
+
+ s->session->master_key_length = sizeof(s->session->master_key);
+ if (s->tls_session_secret_cb(s, s->session->master_key,
+ &s->session->master_key_length, ciphers,
+ &pref_cipher,
+ s->tls_session_secret_cb_arg)) {
+ s->hit = 1;
+ s->session->ciphers = ciphers;
+ s->session->verify_result = X509_V_OK;
+
+ ciphers = NULL;
+
+ /* check if some cipher was preferred by call back */
+ pref_cipher =
+ pref_cipher ? pref_cipher : ssl3_choose_cipher(s,
+ s->
+ session->ciphers,
+ SSL_get_ciphers
+ (s));
+ if (pref_cipher == NULL) {
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER);
+ goto f_err;
+ }
+
+ s->session->cipher = pref_cipher;
+ sk_SSL_CIPHER_free(s->cipher_list);
+ s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
+ sk_SSL_CIPHER_free(s->cipher_list_by_id);
+ s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->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;
+#ifndef OPENSSL_NO_COMP
+ /* This only happens if we have a cache hit */
+ 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)) {
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
+ SSL_R_INCONSISTENT_COMPRESSION);
+ goto f_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) {
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
+ SSL_R_INVALID_COMPRESSION_ALGORITHM);
+ goto f_err;
+ }
+ /* Look for resumed method in compression list */
+ for (k = 0; k < complen; k++) {
+ if (PACKET_data(&compression)[k] == comp_id)
+ break;
+ }
+ if (k >= complen) {
+ al = SSL_AD_ILLEGAL_PARAMETER;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
+ SSL_R_REQUIRED_COMPRESSION_ALGORITHM_MISSING);
+ goto f_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 < complen; o++) {
+ if (v == PACKET_data(&compression)[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) {
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_INCONSISTENT_COMPRESSION);
+ goto f_err;
+ }
+#endif
+
+ /*
+ * Given s->session->ciphers and SSL_get_ciphers, we must pick a cipher
+ */
+
+ if (!s->hit) {
+#ifdef OPENSSL_NO_COMP
+ s->session->compress_meth = 0;
+#else
+ s->session->compress_meth = (comp == NULL) ? 0 : comp->id;
+#endif
+ sk_SSL_CIPHER_free(s->session->ciphers);
+ s->session->ciphers = ciphers;
+ if (ciphers == NULL) {
+ al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
+ goto f_err;
+ }
+ ciphers = NULL;
+ if (!tls1_set_server_sigalgs(s)) {
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
+ goto err;
+ }
+ }
+
+ sk_SSL_CIPHER_free(ciphers);
+ return MSG_PROCESS_CONTINUE_PROCESSING;
+ f_err:
+ ssl3_send_alert(s, SSL3_AL_FATAL, al);
+ err:
+ ossl_statem_set_error(s);
+
+ sk_SSL_CIPHER_free(ciphers);
+ return MSG_PROCESS_ERROR;
+
+}
+
+WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst)
+{
+ int al = SSL_AD_HANDSHAKE_FAILURE;
+ const SSL_CIPHER *cipher;
+
+ if (wst == WORK_MORE_A) {
+ if (!s->hit) {
+ /* Let cert callback update server certificates if required */
+ if (s->cert->cert_cb) {
+ int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
+ if (rv == 0) {
+ al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
+ SSL_R_CERT_CB_ERROR);
+ goto f_err;
+ }
+ if (rv < 0) {
+ s->rwstate = SSL_X509_LOOKUP;
+ return WORK_MORE_A;
+ }
+ s->rwstate = SSL_NOTHING;
+ }
+ cipher =
+ ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
+
+ if (cipher == NULL) {
+ SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
+ SSL_R_NO_SHARED_CIPHER);
+ goto f_err;
+ }
+ s->s3->tmp.new_cipher = cipher;
+ /* check whether we should disable session resumption */
+ if (s->not_resumable_session_cb != NULL)
+ s->session->not_resumable = s->not_resumable_session_cb(s,
+ ((cipher->algorithm_mkey & (SSL_kDHE | SSL_kECDHE)) != 0));
+ if (s->session->not_resumable)
+ /* do not send a session ticket */
+ s->tlsext_ticket_expected = 0;
+ } else {
+ /* Session-id reuse */
+ s->s3->tmp.new_cipher = s->session->cipher;
+ }
+
+ if (!(s->verify_mode & SSL_VERIFY_PEER)) {
+ if (!ssl3_digest_cached_records(s, 0)) {
+ al = SSL_AD_INTERNAL_ERROR;
+ goto f_err;
+ }
+ }
+
+ /*-
+ * 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.
+ */
+
+ /* Handles TLS extensions that we couldn't check earlier */
+ if (s->version >= SSL3_VERSION) {
+ if (!ssl_check_clienthello_tlsext_late(s, &al)) {
+ SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
+ SSL_R_CLIENTHELLO_TLSEXT);
+ goto f_err;
+ }
+ }
+
+ wst = WORK_MORE_B;
+ }
+#ifndef OPENSSL_NO_SRP
+ if (wst == WORK_MORE_B) {
+ int ret;
+ if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) {
+ /*
+ * callback indicates further work to be done
+ */
+ s->rwstate = SSL_X509_LOOKUP;
+ return WORK_MORE_B;
+ }
+ if (ret != SSL_ERROR_NONE) {
+ /*
+ * This is not really an error but the only means to for
+ * a client to detect whether srp is supported.
+ */
+ if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
+ SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
+ SSL_R_CLIENTHELLO_TLSEXT);
+ else
+ SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
+ SSL_R_PSK_IDENTITY_NOT_FOUND);
+ goto f_err;
+ }
+ }
+#endif
+ s->renegotiate = 2;
+
+ return WORK_FINISHED_STOP;
+ f_err:
+ ssl3_send_alert(s, SSL3_AL_FATAL, al);
+ ossl_statem_set_error(s);
+ return WORK_ERROR;
+}
+
+int tls_construct_server_hello(SSL *s)
+{
+ unsigned char *buf;
+ unsigned char *p, *d;
+ int i, sl;
+ int al = 0;
+ unsigned long l;
+
+ buf = (unsigned char *)s->init_buf->data;
+
+ /* Do the message type and length last */
+ d = p = ssl_handshake_start(s);
+
+ *(p++) = s->version >> 8;
+ *(p++) = s->version & 0xff;
+
+ /*
+ * Random stuff. Filling of the server_random takes place in
+ * tls_process_client_hello()
+ */
+ memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE);
+ p += SSL3_RANDOM_SIZE;
+
+ /*-
+ * There are several cases for the session ID to send
+ * back in the server hello:
+ * - For session reuse from the session cache,
+ * we send back the old session ID.
+ * - If stateless session reuse (using a session ticket)
+ * is successful, we send back the client's "session ID"
+ * (which doesn't actually identify the session).
+ * - If it is a new session, we send back the new
+ * session ID.
+ * - However, if we want the new session to be single-use,
+ * we send back a 0-length session ID.
+ * s->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;
+
+ sl = s->session->session_id_length;
+ if (sl > (int)sizeof(s->session->session_id)) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
+ ossl_statem_set_error(s);
+ return 0;
+ }
+ *(p++) = sl;
+ memcpy(p, s->session->session_id, sl);
+ p += sl;
+
+ /* put the cipher */
+ i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p);
+ p += i;
+
+ /* put the compression method */
+#ifdef OPENSSL_NO_COMP
+ *(p++) = 0;
+#else
+ if (s->s3->tmp.new_compression == NULL)
+ *(p++) = 0;
+ else
+ *(p++) = s->s3->tmp.new_compression->id;
+#endif
+
+ if (ssl_prepare_serverhello_tlsext(s) <= 0) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT);
+ ossl_statem_set_error(s);
+ return 0;
+ }
+ if ((p =
+ ssl_add_serverhello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH,
+ &al)) == NULL) {
+ ssl3_send_alert(s, SSL3_AL_FATAL, al);
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
+ ossl_statem_set_error(s);
+ return 0;
+ }
+
+ /* do the header */
+ l = (p - d);
+ if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l)) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
+ ossl_statem_set_error(s);
+ return 0;
+ }
+
+ return 1;
+}
+
+int tls_construct_server_done(SSL *s)
+{
+ if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0)) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_DONE, ERR_R_INTERNAL_ERROR);
+ ossl_statem_set_error(s);
+ return 0;
+ }
+
+ if (!s->s3->tmp.cert_request) {
+ if (!ssl3_digest_cached_records(s, 0)) {
+ ossl_statem_set_error(s);
+ }
+ }
+
+ return 1;
+}
+
+int tls_construct_server_key_exchange(SSL *s)
+{
+#ifndef OPENSSL_NO_DH
+ EVP_PKEY *pkdh = NULL;
+ int j;
+#endif
+#ifndef OPENSSL_NO_EC
+ unsigned char *encodedPoint = NULL;
+ int encodedlen = 0;
+ int curve_id = 0;
+#endif
+ EVP_PKEY *pkey;
+ const EVP_MD *md = NULL;
+ unsigned char *p, *d;
+ int al, i;
+ unsigned long type;
+ int n;
+ const BIGNUM *r[4];
+ int nr[4], kn;
+ BUF_MEM *buf;
+ EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
+
+ if (md_ctx == NULL) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
+ al = SSL_AD_INTERNAL_ERROR;
+ goto f_err;
+ }
+
+ type = s->s3->tmp.new_cipher->algorithm_mkey;
+
+ buf = s->init_buf;
+
+ r[0] = r[1] = r[2] = r[3] = NULL;
+ n = 0;
+#ifndef OPENSSL_NO_PSK
+ if (type & SSL_PSK) {
+ /*
+ * reserve size for record length and PSK identity hint
+ */
+ n += 2;
+ if (s->cert->psk_identity_hint)
+ n += strlen(s->cert->psk_identity_hint);
+ }
+ /* 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);
+ al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ goto f_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) {
+ al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ goto f_err;
+ }
+ pkdhp = pkdh;
+ }
+ if (pkdhp == NULL) {
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ SSL_R_MISSING_TMP_DH_KEY);
+ goto f_err;
+ }
+ if (!ssl_security(s, SSL_SECOP_TMP_DH,
+ EVP_PKEY_security_bits(pkdhp), 0, pkdhp)) {
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ SSL_R_DH_KEY_TOO_SMALL);
+ goto f_err;
+ }
+ if (s->s3->tmp.pkey != NULL) {
+ SSLerr(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) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB);
+ goto err;
+ }
+
+ dh = EVP_PKEY_get0_DH(s->s3->tmp.pkey);
+
+ 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)) {
+ int nid;
+
+ if (s->s3->tmp.pkey != NULL) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ /* Get NID of appropriate shared curve */
+ nid = tls1_shared_curve(s, -2);
+ curve_id = tls1_ec_nid2curve_id(nid);
+ if (curve_id == 0) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
+ goto err;
+ }
+ s->s3->tmp.pkey = ssl_generate_pkey_curve(curve_id);
+ /* Generate a new key for this curve */
+ if (s->s3->tmp.pkey == NULL) {
+ al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB);
+ goto f_err;
+ }
+
+ /* Encode the public key. */
+ encodedlen = EVP_PKEY_get1_tls_encodedpoint(s->s3->tmp.pkey,
+ &encodedPoint);
+ if (encodedlen == 0) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EC_LIB);
+ goto err;
+ }
+
+ /*
+ * We only support named (not generic) curves in ECDH ephemeral key
+ * exchanges. In this situation, we need four additional bytes to
+ * encode the entire ServerECDHParams structure.
+ */
+ n += 4 + encodedlen;
+
+ /*
+ * 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)) {
+ SSLerr(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
+ {
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
+ goto f_err;
+ }
+ for (i = 0; i < 4 && r[i] != NULL; i++) {
+ nr[i] = BN_num_bytes(r[i]);
+#ifndef OPENSSL_NO_SRP
+ if ((i == 2) && (type & SSL_kSRP))
+ n += 1 + nr[i];
+ else
+#endif
+#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, so use the length of the prime here
+ */
+ if ((i == 2) && (type & (SSL_kDHE | SSL_kDHEPSK)))
+ n += 2 + nr[0];
+ else
+#endif
+ n += 2 + nr[i];
+ }
+
+ if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP))
+ && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) {
+ if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, &md))
+ == NULL) {
+ al = SSL_AD_DECODE_ERROR;
+ goto f_err;
+ }
+ kn = EVP_PKEY_size(pkey);
+ /* Allow space for signature algorithm */
+ if (SSL_USE_SIGALGS(s))
+ kn += 2;
+ /* Allow space for signature length */
+ kn += 2;
+ } else {
+ pkey = NULL;
+ kn = 0;
+ }
+
+ if (!BUF_MEM_grow_clean(buf, n + SSL_HM_HEADER_LENGTH(s) + kn)) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_BUF);
+ goto err;
+ }
+ d = p = ssl_handshake_start(s);
+
+#ifndef OPENSSL_NO_PSK
+ if (type & SSL_PSK) {
+ /* copy PSK identity hint */
+ if (s->cert->psk_identity_hint) {
+ size_t len = strlen(s->cert->psk_identity_hint);
+ if (len > PSK_MAX_IDENTITY_LEN) {
+ /*
+ * Should not happen - we already checked this when we set
+ * the identity hint
+ */
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ s2n(len, p);
+ memcpy(p, s->cert->psk_identity_hint, len);
+ p += len;
+ } else {
+ s2n(0, p);
+ }
+ }
+#endif
+
+ for (i = 0; i < 4 && r[i] != NULL; i++) {
+#ifndef OPENSSL_NO_SRP
+ if ((i == 2) && (type & SSL_kSRP)) {
+ *p = nr[i];
+ p++;
+ } else
+#endif
+#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))) {
+ s2n(nr[0], p);
+ for (j = 0; j < (nr[0] - nr[2]); ++j) {
+ *p = 0;
+ ++p;
+ }
+ } else
+#endif
+ s2n(nr[i], p);
+ BN_bn2bin(r[i], p);
+ p += nr[i];
+ }
+
+#ifndef OPENSSL_NO_EC
+ if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
+ /*
+ * XXX: For now, 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
+ */
+ *p = NAMED_CURVE_TYPE;
+ p += 1;
+ *p = 0;
+ p += 1;
+ *p = curve_id;
+ p += 1;
+ *p = encodedlen;
+ p += 1;
+ memcpy(p, encodedPoint, encodedlen);
+ OPENSSL_free(encodedPoint);
+ encodedPoint = NULL;
+ p += encodedlen;
+ }
+#endif
+
+ /* not anonymous */
+ if (pkey != NULL) {
+ /*
+ * n is the length of the params, they start at &(d[4]) and p
+ * points to the space at the end.
+ */
+ if (md) {
+ /* send signature algorithm */
+ if (SSL_USE_SIGALGS(s)) {
+ if (!tls12_get_sigandhash(p, pkey, md)) {
+ /* Should never happen */
+ al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ goto f_err;
+ }
+ p += 2;
+ }
+#ifdef SSL_DEBUG
+ fprintf(stderr, "Using hash %s\n", EVP_MD_name(md));
+#endif
+ if (EVP_SignInit_ex(md_ctx, md, NULL) <= 0
+ || EVP_SignUpdate(md_ctx, &(s->s3->client_random[0]),
+ SSL3_RANDOM_SIZE) <= 0
+ || EVP_SignUpdate(md_ctx, &(s->s3->server_random[0]),
+ SSL3_RANDOM_SIZE) <= 0
+ || EVP_SignUpdate(md_ctx, d, n) <= 0
+ || EVP_SignFinal(md_ctx, &(p[2]),
+ (unsigned int *)&i, pkey) <= 0) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_EVP);
+ al = SSL_AD_INTERNAL_ERROR;
+ goto f_err;
+ }
+ s2n(i, p);
+ n += i + 2;
+ if (SSL_USE_SIGALGS(s))
+ n += 2;
+ } else {
+ /* Is this error check actually needed? */
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
+ SSL_R_UNKNOWN_PKEY_TYPE);
+ goto f_err;
+ }
+ }
+
+ if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n)) {
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
+ goto f_err;
+ }
+
+ EVP_MD_CTX_free(md_ctx);
+ return 1;
+ f_err:
+ ssl3_send_alert(s, SSL3_AL_FATAL, al);
+ err:
+#ifndef OPENSSL_NO_DH
+ EVP_PKEY_free(pkdh);
+#endif
+#ifndef OPENSSL_NO_EC
+ OPENSSL_free(encodedPoint);
+#endif
+ EVP_MD_CTX_free(md_ctx);
+ ossl_statem_set_error(s);
+ return 0;
+}
+
+int tls_construct_certificate_request(SSL *s)
+{
+ unsigned char *p, *d;
+ int i, j, nl, off, n;
+ STACK_OF(X509_NAME) *sk = NULL;
+ X509_NAME *name;
+ BUF_MEM *buf;
+
+ buf = s->init_buf;
+
+ d = p = ssl_handshake_start(s);
+
+ /* get the list of acceptable cert types */
+ p++;
+ n = ssl3_get_req_cert_type(s, p);
+ d[0] = n;
+ p += n;
+ n++;
+
+ if (SSL_USE_SIGALGS(s)) {
+ const unsigned char *psigs;
+ unsigned char *etmp = p;
+ nl = tls12_get_psigalgs(s, &psigs);
+ /* Skip over length for now */
+ p += 2;
+ nl = tls12_copy_sigalgs(s, p, psigs, nl);
+ /* Now fill in length */
+ s2n(nl, etmp);
+ p += nl;
+ n += nl + 2;
+ }
+
+ off = n;
+ p += 2;
+ n += 2;
+
+ sk = SSL_get_client_CA_list(s);
+ nl = 0;
+ if (sk != NULL) {
+ for (i = 0; i < sk_X509_NAME_num(sk); i++) {
+ name = sk_X509_NAME_value(sk, i);
+ j = i2d_X509_NAME(name, NULL);
+ if (!BUF_MEM_grow_clean(buf, SSL_HM_HEADER_LENGTH(s) + n + j + 2)) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_BUF_LIB);
+ goto err;
+ }
+ p = ssl_handshake_start(s) + n;
+ s2n(j, p);
+ i2d_X509_NAME(name, &p);
+ n += 2 + j;
+ nl += 2 + j;
+ }
+ }
+ /* else no CA names */
+ p = ssl_handshake_start(s) + off;
+ s2n(nl, p);
+
+ if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n)) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ s->s3->tmp.cert_request = 1;
+
+ return 1;
+ err:
+ ossl_statem_set_error(s);
+ return 0;
+}
+
+static int tls_process_cke_psk_preamble(SSL *s, PACKET *pkt, int *al)
+{
+#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)) {
+ *al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_LENGTH_MISMATCH);
+ return 0;
+ }
+ if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) {
+ *al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_DATA_LENGTH_TOO_LONG);
+ return 0;
+ }
+ if (s->psk_server_callback == NULL) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_PSK_NO_SERVER_CB);
+ return 0;
+ }
+
+ if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(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) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(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
+ */
+ *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
+ SSLerr(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) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+
+ s->s3->tmp.psklen = psklen;
+
+ return 1;
+#else
+ /* Should never happen */
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
+ return 0;
+#endif
+}
+
+static int tls_process_cke_rsa(SSL *s, PACKET *pkt, int *al)
+{
+#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_ENC].privatekey);
+ if (rsa == NULL) {
+ *al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(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) {
+ *al = SSL_AD_DECODE_ERROR;
+ SSLerr(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) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(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) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(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_bytes(rand_premaster_secret, sizeof(rand_premaster_secret)) <= 0)
+ goto err;
+
+ /*
+ * Decrypt with no padding. PKCS#1 padding will be removed as part of
+ * the timing-sensitive code below.
+ */
+ decrypt_len = RSA_private_decrypt(PACKET_remaining(&enc_premaster),
+ PACKET_data(&enc_premaster),
+ rsa_decrypt, rsa, RSA_NO_PADDING);
+ if (decrypt_len < 0)
+ 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) {
+ *al = SSL_AD_DECRYPT_ERROR;
+ SSLerr(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)) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ ret = 1;
+ err:
+ OPENSSL_free(rsa_decrypt);
+ return ret;
+#else
+ /* Should never happen */
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_INTERNAL_ERROR);
+ return 0;
+#endif
+}
+
+static int tls_process_cke_dhe(SSL *s, PACKET *pkt, int *al)
+{
+#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) {
+ *al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_DHE,
+ SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
+ goto err;
+ }
+ skey = s->s3->tmp.pkey;
+ if (skey == NULL) {
+ *al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_MISSING_TMP_DH_KEY);
+ goto err;
+ }
+
+ if (PACKET_remaining(pkt) == 0L) {
+ *al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(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 */
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(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) {
+ SSLerr(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 || !DH_set0_key(cdh, pub_key, NULL)) {
+ SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
+ if (pub_key != NULL)
+ BN_free(pub_key);
+ goto err;
+ }
+
+ if (ssl_derive(s, skey, ckey) == 0) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
+ 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 */
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
+ return 0;
+#endif
+}
+
+static int tls_process_cke_ecdhe(SSL *s, PACKET *pkt, int *al)
+{
+#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 */
+ *al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(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) {
+ *al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, SSL_R_LENGTH_MISMATCH);
+ goto err;
+ }
+ ckey = EVP_PKEY_new();
+ if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) <= 0) {
+ SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_EVP_LIB);
+ goto err;
+ }
+ if (EVP_PKEY_set1_tls_encodedpoint(ckey, data, i) == 0) {
+ *al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_EC_LIB);
+ goto err;
+ }
+ }
+
+ if (ssl_derive(s, skey, ckey) == 0) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_INTERNAL_ERROR);
+ 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 */
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_INTERNAL_ERROR);
+ return 0;
+#endif
+}
+
+static int tls_process_cke_srp(SSL *s, PACKET *pkt, int *al)
+{
+#ifndef OPENSSL_NO_SRP
+ unsigned int i;
+ const unsigned char *data;
+
+ if (!PACKET_get_net_2(pkt, &i)
+ || !PACKET_get_bytes(pkt, &data, i)) {
+ *al = SSL_AD_DECODE_ERROR;
+ SSLerr(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) {
+ SSLerr(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)) {
+ *al = SSL_AD_ILLEGAL_PARAMETER;
+ SSLerr(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) {
+ SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+
+ if (!srp_generate_server_master_secret(s)) {
+ SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+
+ return 1;
+#else
+ /* Should never happen */
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_INTERNAL_ERROR);
+ return 0;
+#endif
+}
+
+static int tls_process_cke_gost(SSL *s, PACKET *pkt, int *al)
+{
+#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;
+ int Ttag, Tclass;
+ long Tlen;
+ long sess_key_len;
+ const unsigned char *data;
+ 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) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(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();
+ }
+ /* Decrypt session key */
+ sess_key_len = PACKET_remaining(pkt);
+ if (!PACKET_get_bytes(pkt, &data, sess_key_len)) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ if (ASN1_get_object((const unsigned char **)&data, &Tlen, &Ttag,
+ &Tclass, sess_key_len) != V_ASN1_CONSTRUCTED
+ || Ttag != V_ASN1_SEQUENCE || Tclass != V_ASN1_UNIVERSAL) {
+ *al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, SSL_R_DECRYPTION_FAILED);
+ goto err;
+ }
+ start = data;
+ inlen = Tlen;
+ if (EVP_PKEY_decrypt
+ (pkey_ctx, premaster_secret, &outlen, start, inlen) <= 0) {
+ *al = SSL_AD_DECODE_ERROR;
+ SSLerr(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)) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
+ 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);
+ return ret;
+#else
+ /* Should never happen */
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(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)
+{
+ int al = -1;
+ 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, &al))
+ goto err;
+
+ if (alg_k & SSL_kPSK) {
+ /* Identity extracted earlier: should be nothing left */
+ if (PACKET_remaining(pkt) != 0) {
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(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)) {
+ al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ } else if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) {
+ if (!tls_process_cke_rsa(s, pkt, &al))
+ goto err;
+ } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) {
+ if (!tls_process_cke_dhe(s, pkt, &al))
+ goto err;
+ } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) {
+ if (!tls_process_cke_ecdhe(s, pkt, &al))
+ goto err;
+ } else if (alg_k & SSL_kSRP) {
+ if (!tls_process_cke_srp(s, pkt, &al))
+ goto err;
+ } else if (alg_k & SSL_kGOST) {
+ if (!tls_process_cke_gost(s, pkt, &al))
+ goto err;
+ } else {
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
+ SSL_R_UNKNOWN_CIPHER_TYPE);
+ goto err;
+ }
+
+ return MSG_PROCESS_CONTINUE_PROCESSING;
+ err:
+ if (al != -1)
+ ssl3_send_alert(s, SSL3_AL_FATAL, al);
+#ifndef OPENSSL_NO_PSK
+ OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen);
+ s->s3->tmp.psk = NULL;
+#endif
+ ossl_statem_set_error(s);
+ 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)];
+ /*
+ * Add new shared key for SCTP-Auth, will be ignored if no SCTP
+ * used.
+ */
+ memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
+ sizeof(DTLS1_SCTP_AUTH_LABEL));
+
+ if (SSL_export_keying_material(s, sctpauthkey,
+ sizeof(sctpauthkey), labelbuffer,
+ sizeof(labelbuffer), NULL, 0,
+ 0) <= 0) {
+ ossl_statem_set_error(s);
+ return WORK_ERROR;;
+ }
+
+ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
+ sizeof(sctpauthkey), sctpauthkey);
+ }
+ wst = WORK_MORE_B;
+ }
+
+ if ((wst == WORK_MORE_B)
+ /* Is this SCTP? */
+ && BIO_dgram_is_sctp(SSL_get_wbio(s))
+ /* Are we renegotiating? */
+ && s->renegotiate
+ /* Are we going to skip the CertificateVerify? */
+ && (s->session->peer == NULL || s->statem.no_cert_verify)
+ && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
+ s->s3->in_read_app_data = 2;
+ s->rwstate = SSL_READING;
+ BIO_clear_retry_flags(SSL_get_rbio(s));
+ BIO_set_retry_read(SSL_get_rbio(s));
+ ossl_statem_set_sctp_read_sock(s, 1);
+ return WORK_MORE_B;
+ } else {
+ ossl_statem_set_sctp_read_sock(s, 0);
+ }
+#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)) {
+ ossl_statem_set_error(s);
+ return WORK_ERROR;
+ }
+ return WORK_FINISHED_CONTINUE;
+ } else {
+ if (!s->s3->handshake_buffer) {
+ SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE,
+ ERR_R_INTERNAL_ERROR);
+ ossl_statem_set_error(s);
+ 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)) {
+ ossl_statem_set_error(s);
+ return WORK_ERROR;
+ }
+ }
+
+ return WORK_FINISHED_CONTINUE;
+}
+
+MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt)
+{
+ EVP_PKEY *pkey = NULL;
+ const unsigned char *sig, *data;
+#ifndef OPENSSL_NO_GOST
+ unsigned char *gost_data = NULL;
+#endif
+ int al, ret = MSG_PROCESS_ERROR;
+ int type = 0, j;
+ unsigned int len;
+ X509 *peer;
+ const EVP_MD *md = NULL;
+ long hdatalen = 0;
+ void *hdata;
+
+ EVP_MD_CTX *mctx = EVP_MD_CTX_new();
+
+ if (mctx == NULL) {
+ SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE);
+ al = SSL_AD_INTERNAL_ERROR;
+ goto f_err;
+ }
+
+ peer = s->session->peer;
+ pkey = X509_get0_pubkey(peer);
+ type = X509_certificate_type(peer, pkey);
+
+ if (!(type & EVP_PKT_SIGN)) {
+ SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY,
+ SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
+ al = SSL_AD_ILLEGAL_PARAMETER;
+ goto f_err;
+ }
+
+ /* Check for broken implementations of GOST ciphersuites */
+ /*
+ * If key is GOST and n is exactly 64, it is bare signature without
+ * length field (CryptoPro implementations at least till CSP 4.0)
+ */
+#ifndef OPENSSL_NO_GOST
+ if (PACKET_remaining(pkt) == 64
+ && EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) {
+ len = 64;
+ } else
+#endif
+ {
+ if (SSL_USE_SIGALGS(s)) {
+ int rv;
+
+ if (!PACKET_get_bytes(pkt, &sig, 2)) {
+ al = SSL_AD_DECODE_ERROR;
+ goto f_err;
+ }
+ rv = tls12_check_peer_sigalg(&md, s, sig, pkey);
+ if (rv == -1) {
+ al = SSL_AD_INTERNAL_ERROR;
+ goto f_err;
+ } else if (rv == 0) {
+ al = SSL_AD_DECODE_ERROR;
+ goto f_err;
+ }
+#ifdef SSL_DEBUG
+ fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
+#endif
+ } else {
+ /* Use default digest for this key type */
+ int idx = ssl_cert_type(NULL, pkey);
+ if (idx >= 0)
+ md = s->s3->tmp.md[idx];
+ if (md == NULL) {
+ al = SSL_AD_INTERNAL_ERROR;
+ goto f_err;
+ }
+ }
+
+ if (!PACKET_get_net_2(pkt, &len)) {
+ SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);
+ al = SSL_AD_DECODE_ERROR;
+ goto f_err;
+ }
+ }
+ j = EVP_PKEY_size(pkey);
+ if (((int)len > j) || ((int)PACKET_remaining(pkt) > j)
+ || (PACKET_remaining(pkt) == 0)) {
+ SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE);
+ al = SSL_AD_DECODE_ERROR;
+ goto f_err;
+ }
+ if (!PACKET_get_bytes(pkt, &data, len)) {
+ SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);
+ al = SSL_AD_DECODE_ERROR;
+ goto f_err;
+ }
+
+ hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
+ if (hdatalen <= 0) {
+ SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
+ al = SSL_AD_INTERNAL_ERROR;
+ goto f_err;
+ }
+#ifdef SSL_DEBUG
+ fprintf(stderr, "Using client verify alg %s\n", EVP_MD_name(md));
+#endif
+ if (!EVP_VerifyInit_ex(mctx, md, NULL)
+ || !EVP_VerifyUpdate(mctx, hdata, hdatalen)) {
+ SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB);
+ al = SSL_AD_INTERNAL_ERROR;
+ goto f_err;
+ }
+#ifndef OPENSSL_NO_GOST
+ {
+ int pktype = EVP_PKEY_id(pkey);
+ if (pktype == NID_id_GostR3410_2001
+ || pktype == NID_id_GostR3410_2012_256
+ || pktype == NID_id_GostR3410_2012_512) {
+ if ((gost_data = OPENSSL_malloc(len)) == NULL) {
+ SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE);
+ al = SSL_AD_INTERNAL_ERROR;
+ goto f_err;
+ }
+ BUF_reverse(gost_data, data, len);
+ data = gost_data;
+ }
+ }
+#endif
+
+ if (s->version == SSL3_VERSION
+ && !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET,
+ s->session->master_key_length,
+ s->session->master_key)) {
+ SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB);
+ al = SSL_AD_INTERNAL_ERROR;
+ goto f_err;
+ }
+
+ if (EVP_VerifyFinal(mctx, data, len, pkey) <= 0) {
+ al = SSL_AD_DECRYPT_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE);
+ goto f_err;
+ }
+
+ ret = MSG_PROCESS_CONTINUE_PROCESSING;
+ if (0) {
+ f_err:
+ ssl3_send_alert(s, SSL3_AL_FATAL, al);
+ ossl_statem_set_error(s);
+ }
+ BIO_free(s->s3->handshake_buffer);
+ s->s3->handshake_buffer = NULL;
+ EVP_MD_CTX_free(mctx);
+#ifndef OPENSSL_NO_GOST
+ OPENSSL_free(gost_data);
+#endif
+ return ret;
+}
+
+MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt)
+{
+ int i, al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR;
+ X509 *x = NULL;
+ unsigned long l, llen;
+ const unsigned char *certstart, *certbytes;
+ STACK_OF(X509) *sk = NULL;
+ PACKET spkt;
+
+ if ((sk = sk_X509_new_null()) == NULL) {
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
+ goto f_err;
+ }
+
+ if (!PACKET_get_net_3(pkt, &llen)
+ || !PACKET_get_sub_packet(pkt, &spkt, llen)
+ || PACKET_remaining(pkt) != 0) {
+ al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
+ goto f_err;
+ }
+
+ while (PACKET_remaining(&spkt) > 0) {
+ if (!PACKET_get_net_3(&spkt, &l)
+ || !PACKET_get_bytes(&spkt, &certbytes, l)) {
+ al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ SSL_R_CERT_LENGTH_MISMATCH);
+ goto f_err;
+ }
+
+ certstart = certbytes;
+ x = d2i_X509(NULL, (const unsigned char **)&certbytes, l);
+ if (x == NULL) {
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB);
+ goto f_err;
+ }
+ if (certbytes != (certstart + l)) {
+ al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ SSL_R_CERT_LENGTH_MISMATCH);
+ goto f_err;
+ }
+ if (!sk_X509_push(sk, x)) {
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
+ goto f_err;
+ }
+ x = NULL;
+ }
+
+ if (sk_X509_num(sk) <= 0) {
+ /* TLS does not mind 0 certs returned */
+ if (s->version == SSL3_VERSION) {
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ SSL_R_NO_CERTIFICATES_RETURNED);
+ goto f_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)) {
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ goto f_err;
+ }
+ /* No client certificate so digest cached records */
+ if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) {
+ goto f_err;
+ }
+ } else {
+ EVP_PKEY *pkey;
+ i = ssl_verify_cert_chain(s, sk);
+ if (i <= 0) {
+ al = ssl_verify_alarm_type(s->verify_result);
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ SSL_R_CERTIFICATE_VERIFY_FAILED);
+ goto f_err;
+ }
+ if (i > 1) {
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i);
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ goto f_err;
+ }
+ pkey = X509_get0_pubkey(sk_X509_value(sk, 0));
+ if (pkey == NULL) {
+ al = SSL3_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
+ SSL_R_UNKNOWN_CERTIFICATE_TYPE);
+ goto f_err;
+ }
+ }
+
+ 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;
+ /*
+ * Inconsistency alert: cert_chain does *not* include the peer's own
+ * certificate, while we do include it in statem_clnt.c
+ */
+ sk = NULL;
+ ret = MSG_PROCESS_CONTINUE_READING;
+ goto done;
+
+ f_err:
+ ssl3_send_alert(s, SSL3_AL_FATAL, al);
+ ossl_statem_set_error(s);
+ done:
+ X509_free(x);
+ sk_X509_pop_free(sk, X509_free);
+ return ret;
+}
+
+int tls_construct_server_certificate(SSL *s)
+{
+ CERT_PKEY *cpk;
+
+ cpk = ssl_get_server_send_pkey(s);
+ if (cpk == NULL) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
+ ossl_statem_set_error(s);
+ return 0;
+ }
+
+ if (!ssl3_output_cert_chain(s, cpk)) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
+ ossl_statem_set_error(s);
+ return 0;
+ }
+
+ return 1;
+}
+
+int tls_construct_new_session_ticket(SSL *s)
+{
+ unsigned char *senc = NULL;
+ EVP_CIPHER_CTX *ctx = NULL;
+ HMAC_CTX *hctx = NULL;
+ unsigned char *p, *macstart;
+ const unsigned char *const_p;
+ int len, slen_full, slen;
+ SSL_SESSION *sess;
+ unsigned int hlen;
+ SSL_CTX *tctx = s->initial_ctx;
+ unsigned char iv[EVP_MAX_IV_LENGTH];
+ unsigned char key_name[TLSEXT_KEYNAME_LENGTH];
+ int iv_len;
+
+ /* 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) {
+ ossl_statem_set_error(s);
+ return 0;
+ }
+ senc = OPENSSL_malloc(slen_full);
+ if (senc == NULL) {
+ ossl_statem_set_error(s);
+ return 0;
+ }
+
+ ctx = EVP_CIPHER_CTX_new();
+ hctx = HMAC_CTX_new();
+ if (ctx == NULL || hctx == NULL) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ p = senc;
+ if (!i2d_SSL_SESSION(s->session, &p))
+ 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)
+ goto err;
+ sess->session_id_length = 0; /* ID is irrelevant for the ticket */
+
+ slen = i2d_SSL_SESSION(sess, NULL);
+ if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */
+ SSL_SESSION_free(sess);
+ goto err;
+ }
+ p = senc;
+ if (!i2d_SSL_SESSION(sess, &p)) {
+ SSL_SESSION_free(sess);
+ goto err;
+ }
+ SSL_SESSION_free(sess);
+
+ /*-
+ * Grow buffer if need be: the length calculation is as
+ * follows handshake_header_length +
+ * 4 (ticket lifetime hint) + 2 (ticket length) +
+ * sizeof(keyname) + max_iv_len (iv length) +
+ * max_enc_block_size (max encrypted session * length) +
+ * max_md_size (HMAC) + session_length.
+ */
+ if (!BUF_MEM_grow(s->init_buf,
+ SSL_HM_HEADER_LENGTH(s) + 6 + sizeof(key_name) +
+ EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
+ EVP_MAX_MD_SIZE + slen))
+ goto err;
+
+ p = ssl_handshake_start(s);
+ /*
+ * Initialize HMAC and cipher contexts. If callback present it does
+ * all the work otherwise use generated values from parent ctx.
+ */
+ if (tctx->tlsext_ticket_key_cb) {
+ /* if 0 is returned, write an empty ticket */
+ int ret = tctx->tlsext_ticket_key_cb(s, key_name, iv, ctx,
+ hctx, 1);
+
+ if (ret == 0) {
+ l2n(0, p); /* timeout */
+ s2n(0, p); /* length */
+ if (!ssl_set_handshake_header
+ (s, SSL3_MT_NEWSESSION_TICKET, p - ssl_handshake_start(s)))
+ goto err;
+ OPENSSL_free(senc);
+ EVP_CIPHER_CTX_free(ctx);
+ HMAC_CTX_free(hctx);
+ return 1;
+ }
+ if (ret < 0)
+ 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)
+ goto err;
+ if (!EVP_EncryptInit_ex(ctx, cipher, NULL,
+ tctx->tlsext_tick_aes_key, iv))
+ goto err;
+ if (!HMAC_Init_ex(hctx, tctx->tlsext_tick_hmac_key,
+ sizeof(tctx->tlsext_tick_hmac_key),
+ EVP_sha256(), NULL))
+ goto err;
+ memcpy(key_name, tctx->tlsext_tick_key_name,
+ sizeof(tctx->tlsext_tick_key_name));
+ }
+
+ /*
+ * Ticket lifetime hint (advisory only): We leave this unspecified
+ * for resumed session (for simplicity), and guess that tickets for
+ * new sessions will live as long as their sessions.
+ */
+ l2n(s->hit ? 0 : s->session->timeout, p);
+
+ /* Skip ticket length for now */
+ p += 2;
+ /* Output key name */
+ macstart = p;
+ memcpy(p, key_name, sizeof(key_name));
+ p += sizeof(key_name);
+ /* output IV */
+ memcpy(p, iv, iv_len);
+ p += iv_len;
+ /* Encrypt session data */
+ if (!EVP_EncryptUpdate(ctx, p, &len, senc, slen))
+ goto err;
+ p += len;
+ if (!EVP_EncryptFinal(ctx, p, &len))
+ goto err;
+ p += len;
+
+ if (!HMAC_Update(hctx, macstart, p - macstart))
+ goto err;
+ if (!HMAC_Final(hctx, p, &hlen))
+ goto err;
+
+ EVP_CIPHER_CTX_free(ctx);
+ HMAC_CTX_free(hctx);
+ ctx = NULL;
+ hctx = NULL;
+
+ p += hlen;
+ /* Now write out lengths: p points to end of data written */
+ /* Total length */
+ len = p - ssl_handshake_start(s);
+ /* Skip ticket lifetime hint */
+ p = ssl_handshake_start(s) + 4;
+ s2n(len - 6, p);
+ if (!ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len))
+ goto err;
+ OPENSSL_free(senc);
+
+ return 1;
+ err:
+ OPENSSL_free(senc);
+ EVP_CIPHER_CTX_free(ctx);
+ HMAC_CTX_free(hctx);
+ ossl_statem_set_error(s);
+ return 0;
+}
+
+int tls_construct_cert_status(SSL *s)
+{
+ unsigned char *p;
+ size_t msglen;
+
+ /*-
+ * Grow buffer if need be: the length calculation is as
+ * follows handshake_header_length +
+ * 1 (ocsp response type) + 3 (ocsp response length)
+ * + (ocsp response)
+ */
+ msglen = 4 + s->tlsext_ocsp_resplen;
+ if (!BUF_MEM_grow(s->init_buf, SSL_HM_HEADER_LENGTH(s) + msglen))
+ goto err;
+
+ p = ssl_handshake_start(s);
+
+ /* status type */
+ *(p++) = s->tlsext_status_type;
+ /* length of OCSP response */
+ l2n3(s->tlsext_ocsp_resplen, p);
+ /* actual response */
+ memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
+
+ if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_STATUS, msglen))
+ goto err;
+
+ return 1;
+
+ err:
+ ossl_statem_set_error(s);
+ return 0;
+}
+
+#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) {
+ SSLerr(SSL_F_TLS_PROCESS_NEXT_PROTO, SSL_R_LENGTH_MISMATCH);
+ goto err;
+ }
+
+ if (!PACKET_memdup(&next_proto, &s->next_proto_negotiated, &next_proto_len)) {
+ s->next_proto_negotiated_len = 0;
+ goto err;
+ }
+
+ s->next_proto_negotiated_len = (unsigned char)next_proto_len;
+
+ return MSG_PROCESS_CONTINUE_READING;
+ err:
+ ossl_statem_set_error(s);
+ return MSG_PROCESS_ERROR;
+}
+#endif
+
+#define SSLV2_CIPHER_LEN 3
+
+STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,
+ PACKET *cipher_suites,
+ STACK_OF(SSL_CIPHER) **skp,
+ int sslv2format, int *al)
+{
+ const SSL_CIPHER *c;
+ STACK_OF(SSL_CIPHER) *sk;
+ int n;
+ /* 3 = SSLV2_CIPHER_LEN > TLS_CIPHER_LEN = 2. */
+ unsigned char cipher[SSLV2_CIPHER_LEN];
+
+ s->s3->send_connection_binding = 0;
+
+ n = sslv2format ? SSLV2_CIPHER_LEN : TLS_CIPHER_LEN;
+
+ if (PACKET_remaining(cipher_suites) == 0) {
+ SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, SSL_R_NO_CIPHERS_SPECIFIED);
+ *al = SSL_AD_ILLEGAL_PARAMETER;
+ return NULL;
+ }
+
+ if (PACKET_remaining(cipher_suites) % n != 0) {
+ SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
+ SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
+ *al = SSL_AD_DECODE_ERROR;
+ return NULL;
+ }
+
+ if ((skp == NULL) || (*skp == NULL)) {
+ sk = sk_SSL_CIPHER_new_null(); /* change perhaps later */
+ if (sk == NULL) {
+ SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
+ *al = SSL_AD_INTERNAL_ERROR;
+ return NULL;
+ }
+ } else {
+ sk = *skp;
+ sk_SSL_CIPHER_zero(sk);
+ }
+
+ if (!PACKET_memdup(cipher_suites, &s->s3->tmp.ciphers_raw,
+ &s->s3->tmp.ciphers_rawlen)) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ goto err;
+ }
+
+ while (PACKET_copy_bytes(cipher_suites, cipher, n)) {
+ /*
+ * SSLv3 ciphers wrapped in an SSLv2-compatible ClientHello have the
+ * first byte set to zero, while true SSLv2 ciphers have a non-zero
+ * first byte. We don't support any true SSLv2 ciphers, so skip them.
+ */
+ if (sslv2format && cipher[0] != '\0')
+ continue;
+
+ /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */
+ if ((cipher[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) &&
+ (cipher[n - 1] == (SSL3_CK_SCSV & 0xff))) {
+ /* SCSV fatal if renegotiating */
+ if (s->renegotiate) {
+ SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
+ SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING);
+ *al = SSL_AD_HANDSHAKE_FAILURE;
+ goto err;
+ }
+ s->s3->send_connection_binding = 1;
+ continue;
+ }
+
+ /* Check for TLS_FALLBACK_SCSV */
+ if ((cipher[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) &&
+ (cipher[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) {
+ /*
+ * The SCSV indicates that the client previously tried a higher
+ * version. Fail if the current version is an unexpected
+ * downgrade.
+ */
+ if (!ssl_check_version_downgrade(s)) {
+ SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
+ SSL_R_INAPPROPRIATE_FALLBACK);
+ *al = SSL_AD_INAPPROPRIATE_FALLBACK;
+ goto err;
+ }
+ continue;
+ }
+
+ /* For SSLv2-compat, ignore leading 0-byte. */
+ c = ssl_get_cipher_by_char(s, sslv2format ? &cipher[1] : cipher);
+ if (c != NULL) {
+ if (!sk_SSL_CIPHER_push(sk, c)) {
+ SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
+ *al = SSL_AD_INTERNAL_ERROR;
+ goto err;
+ }
+ }
+ }
+ if (PACKET_remaining(cipher_suites) > 0) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ if (skp != NULL)
+ *skp = sk;
+ return (sk);
+ err:
+ if ((skp == NULL) || (*skp == NULL))
+ sk_SSL_CIPHER_free(sk);
+ return NULL;
+}
projects / cassiopeia.git / blobdiff