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 * The following definitions are PRIVATE to the state machine. They should *
13 * NOT be used outside of the state machine. *
15 *****************************************************************************/
17 /* Max message length definitions */
19 /* The spec allows for a longer length than this, but we limit it */
20 #define HELLO_VERIFY_REQUEST_MAX_LENGTH 258
21 #define SERVER_HELLO_MAX_LENGTH 20000
22 #define ENCRYPTED_EXTENSIONS_MAX_LENGTH 20000
23 #define SERVER_KEY_EXCH_MAX_LENGTH 102400
24 #define SERVER_HELLO_DONE_MAX_LENGTH 0
25 #define CCS_MAX_LENGTH 1
26 /* Max should actually be 36 but we are generous */
27 #define FINISHED_MAX_LENGTH 64
29 /* Message processing return codes */
31 /* Something bad happened */
33 /* We've finished reading - swap to writing */
34 MSG_PROCESS_FINISHED_READING,
36 * We've completed the main processing of this message but there is some
37 * post processing to be done.
39 MSG_PROCESS_CONTINUE_PROCESSING,
40 /* We've finished this message - read the next message */
41 MSG_PROCESS_CONTINUE_READING
44 /* Flush the write BIO */
45 int statem_flush(SSL *s);
47 typedef int (*confunc_f) (SSL *s, WPACKET *pkt);
50 * TLS/DTLS client state machine functions
52 int ossl_statem_client_read_transition(SSL *s, int mt);
53 WRITE_TRAN ossl_statem_client_write_transition(SSL *s);
54 WORK_STATE ossl_statem_client_pre_work(SSL *s, WORK_STATE wst);
55 WORK_STATE ossl_statem_client_post_work(SSL *s, WORK_STATE wst);
56 int ossl_statem_client_construct_message(SSL *s, WPACKET *pkt,
57 confunc_f *confunc, int *mt);
58 size_t ossl_statem_client_max_message_size(SSL *s);
59 MSG_PROCESS_RETURN ossl_statem_client_process_message(SSL *s, PACKET *pkt);
60 WORK_STATE ossl_statem_client_post_process_message(SSL *s, WORK_STATE wst);
63 * TLS/DTLS server state machine functions
65 int ossl_statem_server_read_transition(SSL *s, int mt);
66 WRITE_TRAN ossl_statem_server_write_transition(SSL *s);
67 WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst);
68 WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst);
69 int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt,
70 confunc_f *confunc,int *mt);
71 size_t ossl_statem_server_max_message_size(SSL *s);
72 MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt);
73 WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst);
75 /* Functions for getting new message data */
76 __owur int tls_get_message_header(SSL *s, int *mt);
77 __owur int tls_get_message_body(SSL *s, size_t *len);
78 __owur int dtls_get_message(SSL *s, int *mt, size_t *len);
80 /* Message construction and processing functions */
81 __owur int tls_process_initial_server_flight(SSL *s, int *al);
82 __owur MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt);
83 __owur MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt);
84 __owur int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
85 __owur int dtls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
87 __owur int tls_construct_finished(SSL *s, WPACKET *pkt);
88 __owur WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst);
89 __owur WORK_STATE dtls_wait_for_dry(SSL *s);
91 int tls_collect_extensions(PACKET *packet, RAW_EXTENSION **res,
92 size_t *numfound, int *ad);
94 /* some client-only functions */
95 __owur int tls_construct_client_hello(SSL *s, WPACKET *pkt);
96 __owur MSG_PROCESS_RETURN tls_process_server_hello(SSL *s, PACKET *pkt);
97 __owur MSG_PROCESS_RETURN tls_process_certificate_request(SSL *s, PACKET *pkt);
98 __owur MSG_PROCESS_RETURN tls_process_new_session_ticket(SSL *s, PACKET *pkt);
99 __owur MSG_PROCESS_RETURN tls_process_cert_status(SSL *s, PACKET *pkt);
100 __owur MSG_PROCESS_RETURN tls_process_server_done(SSL *s, PACKET *pkt);
101 __owur int tls_construct_client_verify(SSL *s, WPACKET *pkt);
102 __owur WORK_STATE tls_prepare_client_certificate(SSL *s, WORK_STATE wst);
103 __owur int tls_construct_client_certificate(SSL *s, WPACKET *pkt);
104 __owur int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey);
105 __owur int tls_construct_client_key_exchange(SSL *s, WPACKET *pkt);
106 __owur int tls_client_key_exchange_post_work(SSL *s);
107 __owur int tls_construct_cert_status(SSL *s, WPACKET *pkt);
108 __owur MSG_PROCESS_RETURN tls_process_key_exchange(SSL *s, PACKET *pkt);
109 __owur MSG_PROCESS_RETURN tls_process_server_certificate(SSL *s, PACKET *pkt);
110 __owur int ssl3_check_cert_and_algorithm(SSL *s);
111 #ifndef OPENSSL_NO_NEXTPROTONEG
112 __owur int tls_construct_next_proto(SSL *s, WPACKET *pkt);
114 __owur MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, PACKET *pkt);
116 /* some server-only functions */
117 __owur MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt);
118 __owur WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst);
119 __owur int tls_construct_server_hello(SSL *s, WPACKET *pkt);
120 __owur int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt);
121 __owur int tls_construct_server_certificate(SSL *s, WPACKET *pkt);
122 __owur int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt);
123 __owur int tls_construct_certificate_request(SSL *s, WPACKET *pkt);
124 __owur int tls_construct_server_done(SSL *s, WPACKET *pkt);
125 __owur MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt);
126 __owur MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt);
127 __owur WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst);
128 __owur MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt);
129 #ifndef OPENSSL_NO_NEXTPROTONEG
130 __owur MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt);
132 __owur int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt);