/* * Copyright 2015-2017 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 END_OF_EARLY_DATA_MAX_LENGTH 0 #define SERVER_HELLO_MAX_LENGTH 20000 #define HELLO_RETRY_REQUEST_MAX_LENGTH 20000 #define ENCRYPTED_EXTENSIONS_MAX_LENGTH 20000 #define SERVER_KEY_EXCH_MAX_LENGTH 102400 #define SERVER_HELLO_DONE_MAX_LENGTH 0 #define KEY_UPDATE_MAX_LENGTH 1 #define CCS_MAX_LENGTH 1 /* Max should actually be 36 but we are generous */ #define FINISHED_MAX_LENGTH 64 /* The maximum number of incoming KeyUpdate messages we will accept */ #define MAX_KEY_UPDATE_MESSAGES 32 /* Dummy message type */ #define SSL3_MT_DUMMY -1 extern const unsigned char hrrrandom[]; /* 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); int check_in_list(SSL *s, uint16_t group_id, const uint16_t *groups, size_t num_groups, int checkallow); int create_synthetic_message_hash(SSL *s); int parse_ca_names(SSL *s, PACKET *pkt); int construct_ca_names(SSL *s, WPACKET *pkt); size_t construct_key_exchange_tbs(SSL *s, unsigned char **ptbs, const void *param, size_t paramlen); /* * 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); __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 int tls_construct_key_update(SSL *s, WPACKET *pkt); __owur MSG_PROCESS_RETURN tls_process_key_update(SSL *s, PACKET *pkt); __owur WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst, int clearbufs); __owur WORK_STATE dtls_wait_for_dry(SSL *s); /* 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 int tls_process_cert_status_body(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_cert_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_body(SSL *s, WPACKET *pkt); __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 tls_process_hello_req(SSL *s, PACKET *pkt); __owur MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, PACKET *pkt); __owur int tls_construct_end_of_early_data(SSL *s, WPACKET *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); MSG_PROCESS_RETURN tls_process_end_of_early_data(SSL *s, PACKET *pkt); /* Extension processing */ typedef enum ext_return_en { EXT_RETURN_FAIL, EXT_RETURN_SENT, EXT_RETURN_NOT_SENT } EXT_RETURN; __owur int tls_validate_all_contexts(SSL *s, unsigned int thisctx, RAW_EXTENSION *exts); __owur int extension_is_relevant(SSL *s, unsigned int extctx, unsigned int thisctx); __owur int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context, RAW_EXTENSION **res, size_t *len, int init); __owur int tls_parse_extension(SSL *s, TLSEXT_INDEX idx, int context, RAW_EXTENSION *exts, X509 *x, size_t chainidx); __owur int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts, X509 *x, size_t chainidx, int fin); __owur int should_add_extension(SSL *s, unsigned int extctx, unsigned int thisctx, int max_version); __owur int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); __owur int tls_psk_do_binder(SSL *s, const EVP_MD *md, const unsigned char *msgstart, size_t binderoffset, const unsigned char *binderin, unsigned char *binderout, SSL_SESSION *sess, int sign, int external); /* Server Extension processing */ int tls_parse_ctos_renegotiate(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_parse_ctos_server_name(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_parse_ctos_maxfragmentlen(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #ifndef OPENSSL_NO_SRP int tls_parse_ctos_srp(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif int tls_parse_ctos_early_data(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #ifndef OPENSSL_NO_EC int tls_parse_ctos_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_parse_ctos_supported_groups(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidxl); #endif int tls_parse_ctos_session_ticket(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_parse_ctos_sig_algs(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #ifndef OPENSSL_NO_OCSP int tls_parse_ctos_status_request(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif #ifndef OPENSSL_NO_NEXTPROTONEG int tls_parse_ctos_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif int tls_parse_ctos_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #ifndef OPENSSL_NO_SRTP int tls_parse_ctos_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif int tls_parse_ctos_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_parse_ctos_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_parse_ctos_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_parse_ctos_psk_kex_modes(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_parse_ctos_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_stoc_renegotiate(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_stoc_server_name(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_stoc_early_data(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_stoc_maxfragmentlen(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #ifndef OPENSSL_NO_EC EXT_RETURN tls_construct_stoc_ec_pt_formats(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif EXT_RETURN tls_construct_stoc_supported_groups(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_stoc_session_ticket(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #ifndef OPENSSL_NO_OCSP EXT_RETURN tls_construct_stoc_status_request(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif #ifndef OPENSSL_NO_NEXTPROTONEG EXT_RETURN tls_construct_stoc_next_proto_neg(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif EXT_RETURN tls_construct_stoc_alpn(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #ifndef OPENSSL_NO_SRTP EXT_RETURN tls_construct_stoc_use_srtp(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif EXT_RETURN tls_construct_stoc_etm(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_stoc_ems(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_stoc_supported_versions(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_stoc_key_share(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); /* * Not in public headers as this is not an official extension. Only used when * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set. */ #define TLSEXT_TYPE_cryptopro_bug 0xfde8 EXT_RETURN tls_construct_stoc_cryptopro_bug(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_stoc_psk(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); /* Client Extension processing */ EXT_RETURN tls_construct_ctos_renegotiate(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_ctos_server_name(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_ctos_maxfragmentlen(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #ifndef OPENSSL_NO_SRP EXT_RETURN tls_construct_ctos_srp(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif #ifndef OPENSSL_NO_EC EXT_RETURN tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif EXT_RETURN tls_construct_ctos_early_data(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #ifndef OPENSSL_NO_OCSP EXT_RETURN tls_construct_ctos_status_request(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif #ifndef OPENSSL_NO_NEXTPROTONEG EXT_RETURN tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif EXT_RETURN tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #ifndef OPENSSL_NO_SRTP EXT_RETURN tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif EXT_RETURN tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #ifndef OPENSSL_NO_CT EXT_RETURN tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif EXT_RETURN tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_ctos_key_share(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_ctos_cookie(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_ctos_padding(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); EXT_RETURN tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_parse_stoc_maxfragmentlen(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #ifndef OPENSSL_NO_EC int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #ifndef OPENSSL_NO_OCSP int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif #ifndef OPENSSL_NO_CT int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif #ifndef OPENSSL_NO_NEXTPROTONEG int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #ifndef OPENSSL_NO_SRTP int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); #endif int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_parse_stoc_supported_versions(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_parse_stoc_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x, size_t chainidx); int tls_handle_alpn(SSL *s);