[331] | 1 | /*
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| 2 | * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /*****************************************************************************
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| 11 | * *
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| 12 | * The following definitions are PRIVATE to the state machine. They should *
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| 13 | * NOT be used outside of the state machine. *
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| 14 | * *
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| 15 | *****************************************************************************/
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| 16 |
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| 17 | /* Max message length definitions */
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| 18 |
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| 19 | /* The spec allows for a longer length than this, but we limit it */
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| 20 | #define HELLO_VERIFY_REQUEST_MAX_LENGTH 258
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| 21 | #define SERVER_HELLO_MAX_LENGTH 20000
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| 22 | #define SERVER_KEY_EXCH_MAX_LENGTH 102400
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| 23 | #define SERVER_HELLO_DONE_MAX_LENGTH 0
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| 24 | #define CCS_MAX_LENGTH 1
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| 25 | /* Max should actually be 36 but we are generous */
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| 26 | #define FINISHED_MAX_LENGTH 64
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| 27 |
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| 28 | /* Message processing return codes */
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| 29 | typedef enum {
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| 30 | /* Something bad happened */
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| 31 | MSG_PROCESS_ERROR,
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| 32 | /* We've finished reading - swap to writing */
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| 33 | MSG_PROCESS_FINISHED_READING,
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| 34 | /*
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| 35 | * We've completed the main processing of this message but there is some
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| 36 | * post processing to be done.
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| 37 | */
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| 38 | MSG_PROCESS_CONTINUE_PROCESSING,
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| 39 | /* We've finished this message - read the next message */
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| 40 | MSG_PROCESS_CONTINUE_READING
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| 41 | } MSG_PROCESS_RETURN;
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| 42 |
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| 43 | /* Flush the write BIO */
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| 44 | int statem_flush(SSL *s);
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| 45 |
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| 46 | /*
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| 47 | * TLS/DTLS client state machine functions
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| 48 | */
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| 49 | int ossl_statem_client_read_transition(SSL *s, int mt);
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| 50 | WRITE_TRAN ossl_statem_client_write_transition(SSL *s);
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| 51 | WORK_STATE ossl_statem_client_pre_work(SSL *s, WORK_STATE wst);
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| 52 | WORK_STATE ossl_statem_client_post_work(SSL *s, WORK_STATE wst);
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| 53 | int ossl_statem_client_construct_message(SSL *s);
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| 54 | unsigned long ossl_statem_client_max_message_size(SSL *s);
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| 55 | MSG_PROCESS_RETURN ossl_statem_client_process_message(SSL *s, PACKET *pkt);
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| 56 | WORK_STATE ossl_statem_client_post_process_message(SSL *s, WORK_STATE wst);
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| 57 |
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| 58 | /*
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| 59 | * TLS/DTLS server state machine functions
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| 60 | */
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| 61 | int ossl_statem_server_read_transition(SSL *s, int mt);
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| 62 | WRITE_TRAN ossl_statem_server_write_transition(SSL *s);
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| 63 | WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst);
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| 64 | WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst);
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| 65 | int ossl_statem_server_construct_message(SSL *s);
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| 66 | unsigned long ossl_statem_server_max_message_size(SSL *s);
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| 67 | MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt);
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| 68 | WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst);
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| 69 |
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| 70 | /* Functions for getting new message data */
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| 71 | __owur int tls_get_message_header(SSL *s, int *mt);
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| 72 | __owur int tls_get_message_body(SSL *s, unsigned long *len);
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| 73 | __owur int dtls_get_message(SSL *s, int *mt, unsigned long *len);
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| 74 |
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| 75 | /* Message construction and processing functions */
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| 76 | __owur MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt);
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| 77 | __owur MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt);
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| 78 | __owur int tls_construct_change_cipher_spec(SSL *s);
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| 79 | __owur int dtls_construct_change_cipher_spec(SSL *s);
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| 80 |
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| 81 | __owur int tls_construct_finished(SSL *s, const char *sender, int slen);
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| 82 | __owur WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst);
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| 83 | __owur WORK_STATE dtls_wait_for_dry(SSL *s);
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| 84 |
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| 85 | /* some client-only functions */
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| 86 | __owur int tls_construct_client_hello(SSL *s);
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| 87 | __owur MSG_PROCESS_RETURN tls_process_server_hello(SSL *s, PACKET *pkt);
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| 88 | __owur MSG_PROCESS_RETURN tls_process_certificate_request(SSL *s, PACKET *pkt);
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| 89 | __owur MSG_PROCESS_RETURN tls_process_new_session_ticket(SSL *s, PACKET *pkt);
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| 90 | __owur MSG_PROCESS_RETURN tls_process_cert_status(SSL *s, PACKET *pkt);
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| 91 | __owur MSG_PROCESS_RETURN tls_process_server_done(SSL *s, PACKET *pkt);
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| 92 | __owur int tls_construct_client_verify(SSL *s);
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| 93 | __owur WORK_STATE tls_prepare_client_certificate(SSL *s, WORK_STATE wst);
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| 94 | __owur int tls_construct_client_certificate(SSL *s);
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| 95 | __owur int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey);
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| 96 | __owur int tls_construct_client_key_exchange(SSL *s);
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| 97 | __owur int tls_client_key_exchange_post_work(SSL *s);
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| 98 | __owur int tls_construct_cert_status(SSL *s);
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| 99 | __owur MSG_PROCESS_RETURN tls_process_key_exchange(SSL *s, PACKET *pkt);
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| 100 | __owur MSG_PROCESS_RETURN tls_process_server_certificate(SSL *s, PACKET *pkt);
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| 101 | __owur int ssl3_check_cert_and_algorithm(SSL *s);
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| 102 | #ifndef OPENSSL_NO_NEXTPROTONEG
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| 103 | __owur int tls_construct_next_proto(SSL *s);
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| 104 | #endif
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| 105 | __owur MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, PACKET *pkt);
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| 106 |
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| 107 | /* some server-only functions */
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| 108 | __owur MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt);
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| 109 | __owur WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst);
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| 110 | __owur int tls_construct_server_hello(SSL *s);
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| 111 | __owur int tls_construct_hello_request(SSL *s);
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| 112 | __owur int dtls_construct_hello_verify_request(SSL *s);
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| 113 | __owur int tls_construct_server_certificate(SSL *s);
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| 114 | __owur int tls_construct_server_key_exchange(SSL *s);
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| 115 | __owur int tls_construct_certificate_request(SSL *s);
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| 116 | __owur int tls_construct_server_done(SSL *s);
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| 117 | __owur MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt);
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| 118 | __owur MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt);
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| 119 | __owur WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst);
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| 120 | __owur MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt);
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| 121 | #ifndef OPENSSL_NO_NEXTPROTONEG
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| 122 | __owur MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt);
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| 123 | #endif
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| 124 | __owur int tls_construct_new_session_ticket(SSL *s);
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