/* $OpenBSD: tls13_internal.h,v 1.90 2021/06/28 15:35:14 tb Exp $ */ /* * Copyright (c) 2018 Bob Beck * Copyright (c) 2018 Theo Buehler * Copyright (c) 2018, 2019 Joel Sing * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #ifndef HEADER_TLS13_INTERNAL_H #define HEADER_TLS13_INTERNAL_H #include #include #include "bytestring.h" __BEGIN_HIDDEN_DECLS #define TLS13_HS_CLIENT 1 #define TLS13_HS_SERVER 2 #define TLS13_IO_SUCCESS 1 #define TLS13_IO_EOF 0 #define TLS13_IO_FAILURE -1 #define TLS13_IO_ALERT -2 #define TLS13_IO_WANT_POLLIN -3 #define TLS13_IO_WANT_POLLOUT -4 #define TLS13_IO_WANT_RETRY -5 /* Retry the previous call immediately. */ #define TLS13_IO_USE_LEGACY -6 #define TLS13_IO_RECORD_VERSION -7 #define TLS13_IO_RECORD_OVERFLOW -8 #define TLS13_ERR_VERIFY_FAILED 16 #define TLS13_ERR_HRR_FAILED 17 #define TLS13_ERR_TRAILING_DATA 18 #define TLS13_ERR_NO_SHARED_CIPHER 19 #define TLS13_ERR_NO_CERTIFICATE 20 #define TLS13_ERR_NO_PEER_CERTIFICATE 21 #define TLS13_ALERT_LEVEL_WARNING 1 #define TLS13_ALERT_LEVEL_FATAL 2 #define TLS13_ALERT_CLOSE_NOTIFY 0 #define TLS13_ALERT_UNEXPECTED_MESSAGE 10 #define TLS13_ALERT_BAD_RECORD_MAC 20 #define TLS13_ALERT_RECORD_OVERFLOW 22 #define TLS13_ALERT_HANDSHAKE_FAILURE 40 #define TLS13_ALERT_BAD_CERTIFICATE 42 #define TLS13_ALERT_UNSUPPORTED_CERTIFICATE 43 #define TLS13_ALERT_CERTIFICATE_REVOKED 44 #define TLS13_ALERT_CERTIFICATE_EXPIRED 45 #define TLS13_ALERT_CERTIFICATE_UNKNOWN 46 #define TLS13_ALERT_ILLEGAL_PARAMETER 47 #define TLS13_ALERT_UNKNOWN_CA 48 #define TLS13_ALERT_ACCESS_DENIED 49 #define TLS13_ALERT_DECODE_ERROR 50 #define TLS13_ALERT_DECRYPT_ERROR 51 #define TLS13_ALERT_PROTOCOL_VERSION 70 #define TLS13_ALERT_INSUFFICIENT_SECURITY 71 #define TLS13_ALERT_INTERNAL_ERROR 80 #define TLS13_ALERT_INAPPROPRIATE_FALLBACK 86 #define TLS13_ALERT_USER_CANCELED 90 #define TLS13_ALERT_MISSING_EXTENSION 109 #define TLS13_ALERT_UNSUPPORTED_EXTENSION 110 #define TLS13_ALERT_UNRECOGNIZED_NAME 112 #define TLS13_ALERT_BAD_CERTIFICATE_STATUS_RESPONSE 113 #define TLS13_ALERT_UNKNOWN_PSK_IDENTITY 115 #define TLS13_ALERT_CERTIFICATE_REQUIRED 116 #define TLS13_ALERT_NO_APPLICATION_PROTOCOL 120 #define TLS13_INFO_HANDSHAKE_STARTED SSL_CB_HANDSHAKE_START #define TLS13_INFO_HANDSHAKE_COMPLETED SSL_CB_HANDSHAKE_DONE #define TLS13_INFO_ACCEPT_LOOP SSL_CB_ACCEPT_LOOP #define TLS13_INFO_CONNECT_LOOP SSL_CB_CONNECT_LOOP typedef void (*tls13_alert_cb)(uint8_t _alert_desc, void *_cb_arg); typedef ssize_t (*tls13_phh_recv_cb)(void *_cb_arg, CBS *_cbs); typedef void (*tls13_phh_sent_cb)(void *_cb_arg); typedef ssize_t (*tls13_read_cb)(void *_buf, size_t _buflen, void *_cb_arg); typedef ssize_t (*tls13_write_cb)(const void *_buf, size_t _buflen, void *_cb_arg); typedef void (*tls13_handshake_message_cb)(void *_cb_arg); typedef void (*tls13_info_cb)(void *_cb_arg, int _state, int _ret); typedef int (*tls13_ocsp_status_cb)(void *_cb_arg); /* * Buffers. */ struct tls13_buffer; struct tls13_buffer *tls13_buffer_new(size_t init_size); int tls13_buffer_set_data(struct tls13_buffer *buf, CBS *data); void tls13_buffer_free(struct tls13_buffer *buf); ssize_t tls13_buffer_extend(struct tls13_buffer *buf, size_t len, tls13_read_cb read_cb, void *cb_arg); void tls13_buffer_cbs(struct tls13_buffer *buf, CBS *cbs); int tls13_buffer_finish(struct tls13_buffer *buf, uint8_t **out, size_t *out_len); /* * Secrets. */ struct tls13_secret { uint8_t *data; size_t len; }; /* RFC 8446 Section 7.1 Page 92 */ struct tls13_secrets { const EVP_MD *digest; int resumption; int init_done; int early_done; int handshake_done; int schedule_done; int insecure; /* Set by tests */ struct tls13_secret zeros; struct tls13_secret empty_hash; struct tls13_secret extracted_early; struct tls13_secret binder_key; struct tls13_secret client_early_traffic; struct tls13_secret early_exporter_master; struct tls13_secret derived_early; struct tls13_secret extracted_handshake; struct tls13_secret client_handshake_traffic; struct tls13_secret server_handshake_traffic; struct tls13_secret derived_handshake; struct tls13_secret extracted_master; struct tls13_secret client_application_traffic; struct tls13_secret server_application_traffic; struct tls13_secret exporter_master; struct tls13_secret resumption_master; }; int tls13_secret_init(struct tls13_secret *secret, size_t len); void tls13_secret_cleanup(struct tls13_secret *secret); struct tls13_secrets *tls13_secrets_create(const EVP_MD *digest, int resumption); void tls13_secrets_destroy(struct tls13_secrets *secrets); int tls13_hkdf_expand_label(struct tls13_secret *out, const EVP_MD *digest, const struct tls13_secret *secret, const char *label, const struct tls13_secret *context); int tls13_hkdf_expand_label_with_length(struct tls13_secret *out, const EVP_MD *digest, const struct tls13_secret *secret, const uint8_t *label, size_t label_len, const struct tls13_secret *context); int tls13_derive_secret(struct tls13_secret *out, const EVP_MD *digest, const struct tls13_secret *secret, const char *label, const struct tls13_secret *context); int tls13_derive_secret_with_label_length(struct tls13_secret *out, const EVP_MD *digest, const struct tls13_secret *secret, const uint8_t *label, size_t label_len, const struct tls13_secret *context); int tls13_derive_early_secrets(struct tls13_secrets *secrets, uint8_t *psk, size_t psk_len, const struct tls13_secret *context); int tls13_derive_handshake_secrets(struct tls13_secrets *secrets, const uint8_t *ecdhe, size_t ecdhe_len, const struct tls13_secret *context); int tls13_derive_application_secrets(struct tls13_secrets *secrets, const struct tls13_secret *context); int tls13_update_client_traffic_secret(struct tls13_secrets *secrets); int tls13_update_server_traffic_secret(struct tls13_secrets *secrets); /* * Key shares. */ struct tls13_key_share; struct tls13_key_share *tls13_key_share_new(uint16_t group_id); struct tls13_key_share *tls13_key_share_new_nid(int nid); void tls13_key_share_free(struct tls13_key_share *ks); uint16_t tls13_key_share_group(struct tls13_key_share *ks); int tls13_key_share_peer_pkey(struct tls13_key_share *ks, EVP_PKEY *pkey); int tls13_key_share_generate(struct tls13_key_share *ks); int tls13_key_share_public(struct tls13_key_share *ks, CBB *cbb); int tls13_key_share_peer_public(struct tls13_key_share *ks, uint16_t group, CBS *cbs); int tls13_key_share_derive(struct tls13_key_share *ks, uint8_t **shared_key, size_t *shared_key_len); /* * Record Layer. */ struct tls13_record_layer; struct tls13_record_layer_callbacks { tls13_read_cb wire_read; tls13_write_cb wire_write; tls13_alert_cb alert_recv; tls13_alert_cb alert_sent; tls13_phh_recv_cb phh_recv; tls13_phh_sent_cb phh_sent; }; struct tls13_record_layer *tls13_record_layer_new( const struct tls13_record_layer_callbacks *callbacks, void *cb_arg); void tls13_record_layer_free(struct tls13_record_layer *rl); void tls13_record_layer_allow_ccs(struct tls13_record_layer *rl, int allow); void tls13_record_layer_allow_legacy_alerts(struct tls13_record_layer *rl, int allow); void tls13_record_layer_rbuf(struct tls13_record_layer *rl, CBS *cbs); void tls13_record_layer_set_aead(struct tls13_record_layer *rl, const EVP_AEAD *aead); void tls13_record_layer_set_hash(struct tls13_record_layer *rl, const EVP_MD *hash); void tls13_record_layer_set_legacy_version(struct tls13_record_layer *rl, uint16_t version); void tls13_record_layer_set_retry_after_phh(struct tls13_record_layer *rl, int retry); void tls13_record_layer_handshake_completed(struct tls13_record_layer *rl); int tls13_record_layer_set_read_traffic_key(struct tls13_record_layer *rl, struct tls13_secret *read_key); int tls13_record_layer_set_write_traffic_key(struct tls13_record_layer *rl, struct tls13_secret *write_key); ssize_t tls13_record_layer_send_pending(struct tls13_record_layer *rl); ssize_t tls13_record_layer_phh(struct tls13_record_layer *rl, CBS *cbs); ssize_t tls13_read_handshake_data(struct tls13_record_layer *rl, uint8_t *buf, size_t n); ssize_t tls13_write_handshake_data(struct tls13_record_layer *rl, const uint8_t *buf, size_t n); ssize_t tls13_pending_application_data(struct tls13_record_layer *rl); ssize_t tls13_peek_application_data(struct tls13_record_layer *rl, uint8_t *buf, size_t n); ssize_t tls13_read_application_data(struct tls13_record_layer *rl, uint8_t *buf, size_t n); ssize_t tls13_write_application_data(struct tls13_record_layer *rl, const uint8_t *buf, size_t n); ssize_t tls13_send_alert(struct tls13_record_layer *rl, uint8_t alert_desc); ssize_t tls13_send_dummy_ccs(struct tls13_record_layer *rl); /* * Handshake Messages. */ struct tls13_handshake_msg; struct tls13_handshake_msg *tls13_handshake_msg_new(void); void tls13_handshake_msg_free(struct tls13_handshake_msg *msg); void tls13_handshake_msg_data(struct tls13_handshake_msg *msg, CBS *cbs); int tls13_handshake_msg_set_buffer(struct tls13_handshake_msg *msg, CBS *cbs); uint8_t tls13_handshake_msg_type(struct tls13_handshake_msg *msg); int tls13_handshake_msg_content(struct tls13_handshake_msg *msg, CBS *cbs); int tls13_handshake_msg_start(struct tls13_handshake_msg *msg, CBB *body, uint8_t msg_type); int tls13_handshake_msg_finish(struct tls13_handshake_msg *msg); int tls13_handshake_msg_recv(struct tls13_handshake_msg *msg, struct tls13_record_layer *rl); int tls13_handshake_msg_send(struct tls13_handshake_msg *msg, struct tls13_record_layer *rl); struct tls13_handshake_stage { uint8_t hs_type; uint8_t message_number; }; struct ssl_handshake_tls13_st; struct tls13_error { int code; int subcode; int errnum; const char *file; int line; char *msg; }; struct tls13_ctx { struct tls13_error error; SSL *ssl; struct ssl_handshake_st *hs; uint8_t mode; struct tls13_handshake_stage handshake_stage; int handshake_started; int handshake_completed; int middlebox_compat; int send_dummy_ccs; int send_dummy_ccs_after; int close_notify_sent; int close_notify_recv; const EVP_AEAD *aead; const EVP_MD *hash; struct tls13_record_layer *rl; struct tls13_handshake_msg *hs_msg; uint8_t key_update_request; uint8_t alert; int phh_count; time_t phh_last_seen; tls13_handshake_message_cb handshake_message_sent_cb; tls13_handshake_message_cb handshake_message_recv_cb; tls13_info_cb info_cb; tls13_ocsp_status_cb ocsp_status_recv_cb; }; #ifndef TLS13_PHH_LIMIT_TIME #define TLS13_PHH_LIMIT_TIME 3600 #endif #ifndef TLS13_PHH_LIMIT #define TLS13_PHH_LIMIT 100 #endif struct tls13_ctx *tls13_ctx_new(int mode); void tls13_ctx_free(struct tls13_ctx *ctx); const EVP_AEAD *tls13_cipher_aead(const SSL_CIPHER *cipher); const EVP_MD *tls13_cipher_hash(const SSL_CIPHER *cipher); /* * Legacy interfaces. */ int tls13_use_legacy_client(struct tls13_ctx *ctx); int tls13_use_legacy_server(struct tls13_ctx *ctx); int tls13_legacy_accept(SSL *ssl); int tls13_legacy_connect(SSL *ssl); int tls13_legacy_return_code(SSL *ssl, ssize_t ret); ssize_t tls13_legacy_wire_read_cb(void *buf, size_t n, void *arg); ssize_t tls13_legacy_wire_write_cb(const void *buf, size_t n, void *arg); int tls13_legacy_pending(const SSL *ssl); int tls13_legacy_read_bytes(SSL *ssl, int type, unsigned char *buf, int len, int peek); int tls13_legacy_write_bytes(SSL *ssl, int type, const void *buf, int len); int tls13_legacy_shutdown(SSL *ssl); int tls13_legacy_servername_process(struct tls13_ctx *ctx, uint8_t *alert); /* * Message Types - RFC 8446, Section B.3. * * Values listed as "_RESERVED" were used in previous versions of TLS and are * listed here for completeness. TLS 1.3 implementations MUST NOT send them but * might receive them from older TLS implementations. */ #define TLS13_MT_HELLO_REQUEST_RESERVED 0 #define TLS13_MT_CLIENT_HELLO 1 #define TLS13_MT_SERVER_HELLO 2 #define TLS13_MT_HELLO_VERIFY_REQUEST_RESERVED 3 #define TLS13_MT_NEW_SESSION_TICKET 4 #define TLS13_MT_END_OF_EARLY_DATA 5 #define TLS13_MT_HELLO_RETRY_REQUEST_RESERVED 6 #define TLS13_MT_ENCRYPTED_EXTENSIONS 8 #define TLS13_MT_CERTIFICATE 11 #define TLS13_MT_SERVER_KEY_EXCHANGE_RESERVED 12 #define TLS13_MT_CERTIFICATE_REQUEST 13 #define TLS13_MT_SERVER_HELLO_DONE_RESERVED 14 #define TLS13_MT_CERTIFICATE_VERIFY 15 #define TLS13_MT_CLIENT_KEY_EXCHANGE_RESERVED 16 #define TLS13_MT_FINISHED 20 #define TLS13_MT_CERTIFICATE_URL_RESERVED 21 #define TLS13_MT_CERTIFICATE_STATUS_RESERVED 22 #define TLS13_MT_SUPPLEMENTAL_DATA_RESERVED 23 #define TLS13_MT_KEY_UPDATE 24 #define TLS13_MT_MESSAGE_HASH 254 int tls13_handshake_msg_record(struct tls13_ctx *ctx); int tls13_handshake_perform(struct tls13_ctx *ctx); int tls13_client_init(struct tls13_ctx *ctx); int tls13_server_init(struct tls13_ctx *ctx); int tls13_client_connect(struct tls13_ctx *ctx); int tls13_server_accept(struct tls13_ctx *ctx); int tls13_client_hello_send(struct tls13_ctx *ctx, CBB *cbb); int tls13_client_hello_sent(struct tls13_ctx *ctx); int tls13_client_hello_recv(struct tls13_ctx *ctx, CBS *cbs); int tls13_client_hello_retry_send(struct tls13_ctx *ctx, CBB *cbb); int tls13_client_hello_retry_recv(struct tls13_ctx *ctx, CBS *cbs); int tls13_client_end_of_early_data_send(struct tls13_ctx *ctx, CBB *cbb); int tls13_client_end_of_early_data_recv(struct tls13_ctx *ctx, CBS *cbs); int tls13_client_certificate_send(struct tls13_ctx *ctx, CBB *cbb); int tls13_client_certificate_recv(struct tls13_ctx *ctx, CBS *cbs); int tls13_client_certificate_verify_send(struct tls13_ctx *ctx, CBB *cbb); int tls13_client_certificate_verify_recv(struct tls13_ctx *ctx, CBS *cbs); int tls13_client_finished_recv(struct tls13_ctx *ctx, CBS *cbs); int tls13_client_finished_send(struct tls13_ctx *ctx, CBB *cbb); int tls13_client_finished_sent(struct tls13_ctx *ctx); int tls13_server_hello_recv(struct tls13_ctx *ctx, CBS *cbs); int tls13_server_hello_send(struct tls13_ctx *ctx, CBB *cbb); int tls13_server_hello_sent(struct tls13_ctx *ctx); int tls13_server_hello_retry_request_recv(struct tls13_ctx *ctx, CBS *cbs); int tls13_server_hello_retry_request_send(struct tls13_ctx *ctx, CBB *cbb); int tls13_server_hello_retry_request_sent(struct tls13_ctx *ctx); int tls13_server_encrypted_extensions_recv(struct tls13_ctx *ctx, CBS *cbs); int tls13_server_encrypted_extensions_send(struct tls13_ctx *ctx, CBB *cbb); int tls13_server_certificate_recv(struct tls13_ctx *ctx, CBS *cbs); int tls13_server_certificate_send(struct tls13_ctx *ctx, CBB *cbb); int tls13_server_certificate_request_recv(struct tls13_ctx *ctx, CBS *cbs); int tls13_server_certificate_request_send(struct tls13_ctx *ctx, CBB *cbb); int tls13_server_certificate_verify_send(struct tls13_ctx *ctx, CBB *cbb); int tls13_server_certificate_verify_recv(struct tls13_ctx *ctx, CBS *cbs); int tls13_server_finished_recv(struct tls13_ctx *ctx, CBS *cbs); int tls13_server_finished_send(struct tls13_ctx *ctx, CBB *cbb); int tls13_server_finished_sent(struct tls13_ctx *ctx); void tls13_error_clear(struct tls13_error *error); int tls13_cert_add(struct tls13_ctx *ctx, CBB *cbb, X509 *cert, int(*build_extensions)(SSL *s, uint16_t msg_type, CBB *cbb)); int tls13_synthetic_handshake_message(struct tls13_ctx *ctx); int tls13_clienthello_hash_init(struct tls13_ctx *ctx); void tls13_clienthello_hash_clear(struct ssl_handshake_tls13_st *hs); int tls13_clienthello_hash_update_bytes(struct tls13_ctx *ctx, void *data, size_t len); int tls13_clienthello_hash_update(struct tls13_ctx *ctx, CBS *cbs); int tls13_clienthello_hash_finalize(struct tls13_ctx *ctx); int tls13_clienthello_hash_validate(struct tls13_ctx *ctx); int tls13_error_set(struct tls13_error *error, int code, int subcode, const char *file, int line, const char *fmt, ...); int tls13_error_setx(struct tls13_error *error, int code, int subcode, const char *file, int line, const char *fmt, ...); #define tls13_set_error(ctx, code, subcode, fmt, ...) \ tls13_error_set(&(ctx)->error, (code), (subcode), __FILE__, __LINE__, \ (fmt), __VA_ARGS__) #define tls13_set_errorx(ctx, code, subcode, fmt, ...) \ tls13_error_setx(&(ctx)->error, (code), (subcode), __FILE__, __LINE__, \ (fmt), __VA_ARGS__) int tls13_exporter(struct tls13_ctx *ctx, const uint8_t *label, size_t label_len, const uint8_t *context_value, size_t context_value_len, uint8_t *out, size_t out_len); extern const uint8_t tls13_downgrade_12[8]; extern const uint8_t tls13_downgrade_11[8]; extern const uint8_t tls13_hello_retry_request_hash[32]; extern const uint8_t tls13_cert_verify_pad[64]; extern const uint8_t tls13_cert_client_verify_context[]; extern const uint8_t tls13_cert_server_verify_context[]; __END_HIDDEN_DECLS #endif