2 * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 /*****************************************************************************
12 * These enums should be considered PRIVATE to the state machine. No *
13 * non-state machine code should need to use these *
15 *****************************************************************************/
17 * Valid return codes used for functions performing work prior to or after
18 * sending or receiving a message
21 /* Something went wrong */
23 /* We're done working and there shouldn't be anything else to do after */
25 /* We're done working move onto the next thing */
26 WORK_FINISHED_CONTINUE,
27 /* We're working on phase A */
29 /* We're working on phase B */
31 /* We're working on phase C */
35 /* Write transition return codes */
37 /* Something went wrong */
39 /* A transition was successfully completed and we should continue */
41 /* There is no more write work to be done */
45 /* Message flow states */
47 /* No handshake in progress */
49 /* A permanent error with this connection */
51 /* We are reading messages */
53 /* We are writing messages */
55 /* Handshake has finished */
63 READ_STATE_POST_PROCESS
68 WRITE_STATE_TRANSITION,
74 /*****************************************************************************
76 * This structure should be considered "opaque" to anything outside of the *
77 * state machine. No non-state machine code should be accessing the members *
78 * of this structure. *
80 *****************************************************************************/
82 struct ossl_statem_st {
84 WRITE_STATE write_state;
85 WORK_STATE write_state_work;
86 READ_STATE read_state;
87 WORK_STATE read_state_work;
88 OSSL_HANDSHAKE_STATE hand_state;
89 /* The handshake state requested by an API call (e.g. HelloRequest) */
90 OSSL_HANDSHAKE_STATE request_state;
92 int read_state_first_init;
93 /* true when we are actually in SSL_accept() or SSL_connect() */
96 * True when are processing a "real" handshake that needs cleaning up (not
97 * just a HelloRequest or similar).
100 /* Should we skip the CertificateVerify message? */
101 unsigned int no_cert_verify;
103 #ifndef OPENSSL_NO_SCTP
104 int in_sctp_read_sock;
107 typedef struct ossl_statem_st OSSL_STATEM;
109 /*****************************************************************************
111 * The following macros/functions represent the libssl internal API to the *
112 * state machine. Any libssl code may call these functions/macros *
114 *****************************************************************************/
116 __owur int ossl_statem_accept(SSL *s);
117 __owur int ossl_statem_connect(SSL *s);
118 void ossl_statem_clear(SSL *s);
119 void ossl_statem_set_renegotiate(SSL *s);
120 void ossl_statem_set_error(SSL *s);
121 int ossl_statem_in_error(const SSL *s);
122 void ossl_statem_set_in_init(SSL *s, int init);
123 int ossl_statem_get_in_handshake(SSL *s);
124 void ossl_statem_set_in_handshake(SSL *s, int inhand);
125 __owur int ossl_statem_skip_early_data(SSL *s);
126 void ossl_statem_check_finish_init(SSL *s, int send);
127 void ossl_statem_set_hello_verify_done(SSL *s);
128 __owur int ossl_statem_app_data_allowed(SSL *s);
129 #ifndef OPENSSL_NO_SCTP
130 void ossl_statem_set_sctp_read_sock(SSL *s, int read_sock);
131 __owur int ossl_statem_in_sctp_read_sock(SSL *s);