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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