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/* ====================================================================
* Copyright (c) 1998-2015 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/*****************************************************************************
* *
* These emums should be considered PRIVATE to the state machine. No *
* non-state machine code should need to use these *
* *
*****************************************************************************/
/*
* Valid return codes used for functions performing work prior to or after
* sending or receiving a message
*/
typedef enum {
/* Something went wrong */
WORK_ERROR,
/* We're done working and there shouldn't be anything else to do after */
WORK_FINISHED_STOP,
/* We're done working move onto the next thing */
WORK_FINISHED_CONTINUE,
/* We're working on phase A */
WORK_MORE_A,
/* We're working on phase B */
WORK_MORE_B
} WORK_STATE;
/* Write transition return codes */
typedef enum {
/* Something went wrong */
WRITE_TRAN_ERROR,
/* A transition was successfully completed and we should continue */
WRITE_TRAN_CONTINUE,
/* There is no more write work to be done */
WRITE_TRAN_FINISHED
} WRITE_TRAN;
/* Message flow states */
typedef enum {
/* No handshake in progress */
MSG_FLOW_UNINITED,
/* A permanent error with this connection */
MSG_FLOW_ERROR,
/* We are about to renegotiate */
MSG_FLOW_RENEGOTIATE,
/* We are reading messages */
MSG_FLOW_READING,
/* We are writing messages */
MSG_FLOW_WRITING,
/* Handshake has finished */
MSG_FLOW_FINISHED
} MSG_FLOW_STATE;
/* Read states */
typedef enum {
READ_STATE_HEADER,
READ_STATE_BODY,
READ_STATE_POST_PROCESS
} READ_STATE;
/* Write states */
typedef enum {
WRITE_STATE_TRANSITION,
WRITE_STATE_PRE_WORK,
WRITE_STATE_SEND,
WRITE_STATE_POST_WORK
} WRITE_STATE;
/*****************************************************************************
* *
* This structure should be considered "opaque" to anything outside of the *
* state machine. No non-state machine code should be accessing the members *
* of this structure. *
* *
*****************************************************************************/
struct ossl_statem_st {
MSG_FLOW_STATE state;
WRITE_STATE write_state;
WORK_STATE write_state_work;
READ_STATE read_state;
WORK_STATE read_state_work;
OSSL_HANDSHAKE_STATE hand_state;
int in_init;
int read_state_first_init;
/* true when we are actually in SSL_accept() or SSL_connect() */
int in_handshake;
/* Should we skip the CertificateVerify message? */
unsigned int no_cert_verify;
int use_timer;
#ifndef OPENSSL_NO_SCTP
int in_sctp_read_sock;
#endif
};
typedef struct ossl_statem_st OSSL_STATEM;
/*****************************************************************************
* *
* The following macros/functions represent the libssl internal API to the *
* state machine. Any libssl code may call these functions/macros *
* *
*****************************************************************************/
__owur int ossl_statem_accept(SSL *s);
__owur int ossl_statem_connect(SSL *s);
void ossl_statem_clear(SSL *s);
void ossl_statem_set_renegotiate(SSL *s);
void ossl_statem_set_error(SSL *s);
int ossl_statem_in_error(const SSL *s);
void ossl_statem_set_in_init(SSL *s, int init);
int ossl_statem_get_in_handshake(SSL *s);
void ossl_statem_set_in_handshake(SSL *s, int inhand);
void ossl_statem_set_hello_verify_done(SSL *s);
__owur int ossl_statem_app_data_allowed(SSL *s);
#ifndef OPENSSL_NO_SCTP
void ossl_statem_set_sctp_read_sock(SSL *s, int read_sock);
__owur int ossl_statem_in_sctp_read_sock(SSL *s);
#endif
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