/* * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the OpenSSL license (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ /***************************************************************************** * * * The following definitions are PRIVATE to the state machine. They should * * NOT be used outside of the state machine. * * * *****************************************************************************/ /* Max message length definitions */ /* The spec allows for a longer length than this, but we limit it */ #define HELLO_VERIFY_REQUEST_MAX_LENGTH 258 #define SERVER_HELLO_MAX_LENGTH 20000 #define ENCRYPTED_EXTENSIONS_MAX_LENGTH 20000 #define SERVER_KEY_EXCH_MAX_LENGTH 102400 #define SERVER_HELLO_DONE_MAX_LENGTH 0 #define CCS_MAX_LENGTH 1 /* Max should actually be 36 but we are generous */ #define FINISHED_MAX_LENGTH 64 /* Extension context codes */ #define EXT_TLS_ONLY 0x0001 #define EXT_DTLS_ONLY 0x0002 /* Some extensions may be allowed in DTLS but we don't implement them for it */ #define EXT_TLS_IMPLEMENTATION_ONLY 0x0004 /* Most extensions are not defined for SSLv3 but EXT_TYPE_renegotiate is */ #define EXT_SSL3_ALLOWED 0x0008 #define EXT_TLS1_2_AND_BELOW_ONLY 0x0010 #define EXT_TLS1_3_ONLY 0x0020 #define EXT_CLIENT_HELLO 0x0040 /* Really means TLS1.2 or below */ #define EXT_TLS1_2_SERVER_HELLO 0x0080 #define EXT_TLS1_3_SERVER_HELLO 0x0100 #define EXT_TLS1_3_ENCRYPTED_EXTENSIONS 0x0200 #define EXT_TLS1_3_HELLO_RETRY_REQUEST 0x0400 #define EXT_TLS1_3_CERTIFICATE 0x0800 #define EXT_TLS1_3_NEW_SESSION_TICKET 0x1000 /* Message processing return codes */ typedef enum { /* Something bad happened */ MSG_PROCESS_ERROR, /* We've finished reading - swap to writing */ MSG_PROCESS_FINISHED_READING, /* * We've completed the main processing of this message but there is some * post processing to be done. */ MSG_PROCESS_CONTINUE_PROCESSING, /* We've finished this message - read the next message */ MSG_PROCESS_CONTINUE_READING } MSG_PROCESS_RETURN; /* Flush the write BIO */ int statem_flush(SSL *s); typedef int (*confunc_f) (SSL *s, WPACKET *pkt); /* * TLS/DTLS client state machine functions */ int ossl_statem_client_read_transition(SSL *s, int mt); WRITE_TRAN ossl_statem_client_write_transition(SSL *s); WORK_STATE ossl_statem_client_pre_work(SSL *s, WORK_STATE wst); WORK_STATE ossl_statem_client_post_work(SSL *s, WORK_STATE wst); int ossl_statem_client_construct_message(SSL *s, WPACKET *pkt, confunc_f *confunc, int *mt); size_t ossl_statem_client_max_message_size(SSL *s); MSG_PROCESS_RETURN ossl_statem_client_process_message(SSL *s, PACKET *pkt); WORK_STATE ossl_statem_client_post_process_message(SSL *s, WORK_STATE wst); /* * TLS/DTLS server state machine functions */ int ossl_statem_server_read_transition(SSL *s, int mt); WRITE_TRAN ossl_statem_server_write_transition(SSL *s); WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst); WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst); int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt, confunc_f *confunc,int *mt); size_t ossl_statem_server_max_message_size(SSL *s); MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt); WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst); /* Functions for getting new message data */ __owur int tls_get_message_header(SSL *s, int *mt); __owur int tls_get_message_body(SSL *s, size_t *len); __owur int dtls_get_message(SSL *s, int *mt, size_t *len); /* Message construction and processing functions */ __owur int tls_process_initial_server_flight(SSL *s, int *al); __owur MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt); __owur MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt); __owur int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt); __owur int dtls_construct_change_cipher_spec(SSL *s, WPACKET *pkt); __owur int tls_construct_finished(SSL *s, WPACKET *pkt); __owur WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst); __owur WORK_STATE dtls_wait_for_dry(SSL *s); int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context, RAW_EXTENSION **res, size_t *numfound, int *ad); /* some client-only functions */ __owur int tls_construct_client_hello(SSL *s, WPACKET *pkt); __owur MSG_PROCESS_RETURN tls_process_server_hello(SSL *s, PACKET *pkt); __owur MSG_PROCESS_RETURN tls_process_certificate_request(SSL *s, PACKET *pkt); __owur MSG_PROCESS_RETURN tls_process_new_session_ticket(SSL *s, PACKET *pkt); __owur MSG_PROCESS_RETURN tls_process_cert_status(SSL *s, PACKET *pkt); __owur MSG_PROCESS_RETURN tls_process_server_done(SSL *s, PACKET *pkt); __owur int tls_construct_client_verify(SSL *s, WPACKET *pkt); __owur WORK_STATE tls_prepare_client_certificate(SSL *s, WORK_STATE wst); __owur int tls_construct_client_certificate(SSL *s, WPACKET *pkt); __owur int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey); __owur int tls_construct_client_key_exchange(SSL *s, WPACKET *pkt); __owur int tls_client_key_exchange_post_work(SSL *s); __owur int tls_construct_cert_status(SSL *s, WPACKET *pkt); __owur MSG_PROCESS_RETURN tls_process_key_exchange(SSL *s, PACKET *pkt); __owur MSG_PROCESS_RETURN tls_process_server_certificate(SSL *s, PACKET *pkt); __owur int ssl3_check_cert_and_algorithm(SSL *s); #ifndef OPENSSL_NO_NEXTPROTONEG __owur int tls_construct_next_proto(SSL *s, WPACKET *pkt); #endif __owur MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, PACKET *pkt); /* some server-only functions */ __owur MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt); __owur WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst); __owur int tls_construct_server_hello(SSL *s, WPACKET *pkt); __owur int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt); __owur int tls_construct_server_certificate(SSL *s, WPACKET *pkt); __owur int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt); __owur int tls_construct_certificate_request(SSL *s, WPACKET *pkt); __owur int tls_construct_server_done(SSL *s, WPACKET *pkt); __owur MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt); __owur MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt); __owur WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst); __owur MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt); #ifndef OPENSSL_NO_NEXTPROTONEG __owur MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt); #endif __owur int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt); __owur int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts, size_t numexts, int *al); __owur int tls_parse_extension(SSL *s, int type, int context, RAW_EXTENSION *exts, size_t numexts, int *al); __owur int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context, int *al); /* Server Extension processing */ int tls_parse_clienthello_renegotiate(SSL *s, PACKET *pkt, int *al); int tls_parse_clienthello_server_name(SSL *s, PACKET *pkt, int *al); #ifndef OPENSSL_NO_SRP int tls_parse_clienthello_srp(SSL *s, PACKET *pkt, int *al); #endif #ifndef OPENSSL_NO_EC int tls_parse_clienthello_ec_pt_formats(SSL *s, PACKET *pkt, int *al); int tls_parse_clienthello_supported_groups(SSL *s, PACKET *pkt, int *al); #endif int tls_parse_clienthello_session_ticket(SSL *s, PACKET *pkt, int *al); int tls_parse_clienthello_sig_algs(SSL *s, PACKET *pkt, int *al); int tls_parse_clienthello_status_request(SSL *s, PACKET *pkt, int *al); #ifndef OPENSSL_NO_NEXTPROTONEG int tls_parse_clienthello_npn(SSL *s, PACKET *pkt, int *al); #endif int tls_parse_clienthello_alpn(SSL *s, PACKET *pkt, int *al); #ifndef OPENSSL_NO_SRTP int tls_parse_clienthello_use_srtp(SSL *s, PACKET *pkt, int *al); #endif int tls_parse_clienthello_etm(SSL *s, PACKET *pkt, int *al); int tls_parse_clienthello_key_share(SSL *s, PACKET *pkt, int *al); int tls_parse_clienthello_ems(SSL *s, PACKET *pkt, int *al);