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diff --git a/src/lib/libssl/tls13_internal.h b/src/lib/libssl/tls13_internal.h
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1/* $OpenBSD: tls13_internal.h,v 1.101 2022/07/24 14:28:16 jsing Exp $ */
2/*
3 * Copyright (c) 2018 Bob Beck <beck@openbsd.org>
4 * Copyright (c) 2018 Theo Buehler <tb@openbsd.org>
5 * Copyright (c) 2018, 2019 Joel Sing <jsing@openbsd.org>
6 *
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
14 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
16 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
17 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20#ifndef HEADER_TLS13_INTERNAL_H
21#define HEADER_TLS13_INTERNAL_H
22
23#include <openssl/evp.h>
24#include <openssl/ssl.h>
25
26#include "bytestring.h"
27#include "tls_internal.h"
28
29__BEGIN_HIDDEN_DECLS
30
31#define TLS13_HS_CLIENT 1
32#define TLS13_HS_SERVER 2
33
34#define TLS13_IO_SUCCESS 1
35#define TLS13_IO_EOF 0
36#define TLS13_IO_FAILURE -1
37#define TLS13_IO_ALERT -2
38#define TLS13_IO_WANT_POLLIN -3
39#define TLS13_IO_WANT_POLLOUT -4
40#define TLS13_IO_WANT_RETRY -5 /* Retry the previous call immediately. */
41#define TLS13_IO_USE_LEGACY -6
42#define TLS13_IO_RECORD_VERSION -7
43#define TLS13_IO_RECORD_OVERFLOW -8
44
45#define TLS13_ERR_VERIFY_FAILED 16
46#define TLS13_ERR_HRR_FAILED 17
47#define TLS13_ERR_TRAILING_DATA 18
48#define TLS13_ERR_NO_SHARED_CIPHER 19
49#define TLS13_ERR_NO_CERTIFICATE 20
50#define TLS13_ERR_NO_PEER_CERTIFICATE 21
51
52#define TLS13_ALERT_LEVEL_WARNING 1
53#define TLS13_ALERT_LEVEL_FATAL 2
54
55#define TLS13_ALERT_CLOSE_NOTIFY 0
56#define TLS13_ALERT_UNEXPECTED_MESSAGE 10
57#define TLS13_ALERT_BAD_RECORD_MAC 20
58#define TLS13_ALERT_RECORD_OVERFLOW 22
59#define TLS13_ALERT_HANDSHAKE_FAILURE 40
60#define TLS13_ALERT_BAD_CERTIFICATE 42
61#define TLS13_ALERT_UNSUPPORTED_CERTIFICATE 43
62#define TLS13_ALERT_CERTIFICATE_REVOKED 44
63#define TLS13_ALERT_CERTIFICATE_EXPIRED 45
64#define TLS13_ALERT_CERTIFICATE_UNKNOWN 46
65#define TLS13_ALERT_ILLEGAL_PARAMETER 47
66#define TLS13_ALERT_UNKNOWN_CA 48
67#define TLS13_ALERT_ACCESS_DENIED 49
68#define TLS13_ALERT_DECODE_ERROR 50
69#define TLS13_ALERT_DECRYPT_ERROR 51
70#define TLS13_ALERT_PROTOCOL_VERSION 70
71#define TLS13_ALERT_INSUFFICIENT_SECURITY 71
72#define TLS13_ALERT_INTERNAL_ERROR 80
73#define TLS13_ALERT_INAPPROPRIATE_FALLBACK 86
74#define TLS13_ALERT_USER_CANCELED 90
75#define TLS13_ALERT_MISSING_EXTENSION 109
76#define TLS13_ALERT_UNSUPPORTED_EXTENSION 110
77#define TLS13_ALERT_UNRECOGNIZED_NAME 112
78#define TLS13_ALERT_BAD_CERTIFICATE_STATUS_RESPONSE 113
79#define TLS13_ALERT_UNKNOWN_PSK_IDENTITY 115
80#define TLS13_ALERT_CERTIFICATE_REQUIRED 116
81#define TLS13_ALERT_NO_APPLICATION_PROTOCOL 120
82
83#define TLS13_INFO_HANDSHAKE_STARTED SSL_CB_HANDSHAKE_START
84#define TLS13_INFO_HANDSHAKE_COMPLETED SSL_CB_HANDSHAKE_DONE
85#define TLS13_INFO_ACCEPT_LOOP SSL_CB_ACCEPT_LOOP
86#define TLS13_INFO_CONNECT_LOOP SSL_CB_CONNECT_LOOP
87#define TLS13_INFO_ACCEPT_EXIT SSL_CB_ACCEPT_EXIT
88#define TLS13_INFO_CONNECT_EXIT SSL_CB_CONNECT_EXIT
89
90typedef void (*tls13_alert_cb)(uint8_t _alert_desc, void *_cb_arg);
91typedef ssize_t (*tls13_phh_recv_cb)(void *_cb_arg);
92typedef void (*tls13_phh_sent_cb)(void *_cb_arg);
93typedef void (*tls13_handshake_message_cb)(void *_cb_arg);
94typedef void (*tls13_info_cb)(void *_cb_arg, int _state, int _ret);
95typedef int (*tls13_ocsp_status_cb)(void *_cb_arg);
96
97/*
98 * PSK support.
99 */
100
101/*
102 * Known PskKeyExchangeMode values.
103 * https://www.iana.org/assignments/tls-parameters/#tls-pskkeyexchangemode
104 */
105#define TLS13_PSK_KE 0
106#define TLS13_PSK_DHE_KE 1
107
108/*
109 * Secrets.
110 */
111struct tls13_secret {
112 uint8_t *data;
113 size_t len;
114};
115
116/* RFC 8446 Section 7.1 Page 92 */
117struct tls13_secrets {
118 const EVP_MD *digest;
119 int resumption;
120 int init_done;
121 int early_done;
122 int handshake_done;
123 int schedule_done;
124 int insecure; /* Set by tests */
125 struct tls13_secret zeros;
126 struct tls13_secret empty_hash;
127 struct tls13_secret extracted_early;
128 struct tls13_secret binder_key;
129 struct tls13_secret client_early_traffic;
130 struct tls13_secret early_exporter_master;
131 struct tls13_secret derived_early;
132 struct tls13_secret extracted_handshake;
133 struct tls13_secret client_handshake_traffic;
134 struct tls13_secret server_handshake_traffic;
135 struct tls13_secret derived_handshake;
136 struct tls13_secret extracted_master;
137 struct tls13_secret client_application_traffic;
138 struct tls13_secret server_application_traffic;
139 struct tls13_secret exporter_master;
140 struct tls13_secret resumption_master;
141};
142
143int tls13_secret_init(struct tls13_secret *secret, size_t len);
144void tls13_secret_cleanup(struct tls13_secret *secret);
145struct tls13_secrets *tls13_secrets_create(const EVP_MD *digest,
146 int resumption);
147void tls13_secrets_destroy(struct tls13_secrets *secrets);
148
149int tls13_hkdf_expand_label(struct tls13_secret *out, const EVP_MD *digest,
150 const struct tls13_secret *secret, const char *label,
151 const struct tls13_secret *context);
152int tls13_hkdf_expand_label_with_length(struct tls13_secret *out,
153 const EVP_MD *digest, const struct tls13_secret *secret,
154 const uint8_t *label, size_t label_len, const struct tls13_secret *context);
155
156int tls13_derive_secret(struct tls13_secret *out, const EVP_MD *digest,
157 const struct tls13_secret *secret, const char *label,
158 const struct tls13_secret *context);
159int tls13_derive_secret_with_label_length(struct tls13_secret *out,
160 const EVP_MD *digest, const struct tls13_secret *secret,
161 const uint8_t *label, size_t label_len, const struct tls13_secret *context);
162
163int tls13_derive_early_secrets(struct tls13_secrets *secrets, uint8_t *psk,
164 size_t psk_len, const struct tls13_secret *context);
165int tls13_derive_handshake_secrets(struct tls13_secrets *secrets,
166 const uint8_t *ecdhe, size_t ecdhe_len, const struct tls13_secret *context);
167int tls13_derive_application_secrets(struct tls13_secrets *secrets,
168 const struct tls13_secret *context);
169int tls13_update_client_traffic_secret(struct tls13_secrets *secrets);
170int tls13_update_server_traffic_secret(struct tls13_secrets *secrets);
171
172/*
173 * Record Layer.
174 */
175struct tls13_record_layer;
176
177struct tls13_record_layer_callbacks {
178 /* Wire callbacks. */
179 tls_read_cb wire_read;
180 tls_write_cb wire_write;
181 tls_flush_cb wire_flush;
182
183 /* Interceptors. */
184 tls_handshake_read_cb handshake_read;
185 tls_handshake_write_cb handshake_write;
186 tls_traffic_key_cb set_read_traffic_key;
187 tls_traffic_key_cb set_write_traffic_key;
188 tls_alert_send_cb alert_send;
189
190 /* Notification callbacks. */
191 tls13_alert_cb alert_recv;
192 tls13_alert_cb alert_sent;
193 tls13_phh_recv_cb phh_recv;
194 tls13_phh_sent_cb phh_sent;
195};
196
197struct tls13_record_layer *tls13_record_layer_new(
198 const struct tls13_record_layer_callbacks *callbacks, void *cb_arg);
199void tls13_record_layer_free(struct tls13_record_layer *rl);
200void tls13_record_layer_set_callbacks(struct tls13_record_layer *rl,
201 const struct tls13_record_layer_callbacks *callbacks, void *cb_arg);
202void tls13_record_layer_allow_ccs(struct tls13_record_layer *rl, int allow);
203void tls13_record_layer_allow_legacy_alerts(struct tls13_record_layer *rl, int allow);
204void tls13_record_layer_rcontent(struct tls13_record_layer *rl, CBS *cbs);
205void tls13_record_layer_set_aead(struct tls13_record_layer *rl,
206 const EVP_AEAD *aead);
207void tls13_record_layer_set_hash(struct tls13_record_layer *rl,
208 const EVP_MD *hash);
209void tls13_record_layer_set_legacy_version(struct tls13_record_layer *rl,
210 uint16_t version);
211void tls13_record_layer_set_retry_after_phh(struct tls13_record_layer *rl, int retry);
212void tls13_record_layer_handshake_completed(struct tls13_record_layer *rl);
213int tls13_record_layer_set_read_traffic_key(struct tls13_record_layer *rl,
214 struct tls13_secret *read_key, enum ssl_encryption_level_t read_level);
215int tls13_record_layer_set_write_traffic_key(struct tls13_record_layer *rl,
216 struct tls13_secret *write_key, enum ssl_encryption_level_t write_level);
217ssize_t tls13_record_layer_send_pending(struct tls13_record_layer *rl);
218ssize_t tls13_record_layer_phh(struct tls13_record_layer *rl, CBS *cbs);
219ssize_t tls13_record_layer_flush(struct tls13_record_layer *rl);
220
221ssize_t tls13_read_handshake_data(struct tls13_record_layer *rl, uint8_t *buf, size_t n);
222ssize_t tls13_write_handshake_data(struct tls13_record_layer *rl, const uint8_t *buf,
223 size_t n);
224ssize_t tls13_pending_application_data(struct tls13_record_layer *rl);
225ssize_t tls13_peek_application_data(struct tls13_record_layer *rl, uint8_t *buf, size_t n);
226ssize_t tls13_read_application_data(struct tls13_record_layer *rl, uint8_t *buf, size_t n);
227ssize_t tls13_write_application_data(struct tls13_record_layer *rl, const uint8_t *buf,
228 size_t n);
229
230ssize_t tls13_send_alert(struct tls13_record_layer *rl, uint8_t alert_desc);
231ssize_t tls13_send_dummy_ccs(struct tls13_record_layer *rl);
232
233/*
234 * Handshake Messages.
235 */
236struct tls13_handshake_msg;
237
238struct tls13_handshake_msg *tls13_handshake_msg_new(void);
239void tls13_handshake_msg_free(struct tls13_handshake_msg *msg);
240void tls13_handshake_msg_data(struct tls13_handshake_msg *msg, CBS *cbs);
241uint8_t tls13_handshake_msg_type(struct tls13_handshake_msg *msg);
242int tls13_handshake_msg_content(struct tls13_handshake_msg *msg, CBS *cbs);
243int tls13_handshake_msg_start(struct tls13_handshake_msg *msg, CBB *body,
244 uint8_t msg_type);
245int tls13_handshake_msg_finish(struct tls13_handshake_msg *msg);
246int tls13_handshake_msg_recv(struct tls13_handshake_msg *msg,
247 struct tls13_record_layer *rl);
248int tls13_handshake_msg_send(struct tls13_handshake_msg *msg,
249 struct tls13_record_layer *rl);
250
251struct tls13_handshake_stage {
252 uint8_t hs_type;
253 uint8_t message_number;
254};
255
256struct ssl_handshake_tls13_st;
257
258struct tls13_error {
259 int code;
260 int subcode;
261 int errnum;
262 const char *file;
263 int line;
264 char *msg;
265};
266
267struct tls13_ctx {
268 struct tls13_error error;
269
270 SSL *ssl;
271 struct ssl_handshake_st *hs;
272 uint8_t mode;
273 struct tls13_handshake_stage handshake_stage;
274 int handshake_started;
275 int handshake_completed;
276 int need_flush;
277 int middlebox_compat;
278 int send_dummy_ccs;
279 int send_dummy_ccs_after;
280
281 int close_notify_sent;
282 int close_notify_recv;
283
284 const EVP_AEAD *aead;
285 const EVP_MD *hash;
286
287 struct tls13_record_layer *rl;
288 struct tls13_handshake_msg *hs_msg;
289 uint8_t key_update_request;
290 uint8_t alert;
291 int phh_count;
292 time_t phh_last_seen;
293
294 tls13_handshake_message_cb handshake_message_sent_cb;
295 tls13_handshake_message_cb handshake_message_recv_cb;
296 tls13_info_cb info_cb;
297 tls13_ocsp_status_cb ocsp_status_recv_cb;
298};
299#ifndef TLS13_PHH_LIMIT_TIME
300#define TLS13_PHH_LIMIT_TIME 3600
301#endif
302#ifndef TLS13_PHH_LIMIT
303#define TLS13_PHH_LIMIT 100
304#endif
305
306struct tls13_ctx *tls13_ctx_new(int mode, SSL *ssl);
307void tls13_ctx_free(struct tls13_ctx *ctx);
308
309const EVP_AEAD *tls13_cipher_aead(const SSL_CIPHER *cipher);
310const EVP_MD *tls13_cipher_hash(const SSL_CIPHER *cipher);
311
312void tls13_alert_received_cb(uint8_t alert_desc, void *arg);
313void tls13_alert_sent_cb(uint8_t alert_desc, void *arg);
314ssize_t tls13_phh_received_cb(void *cb_arg);
315void tls13_phh_done_cb(void *cb_arg);
316
317int tls13_quic_init(struct tls13_ctx *ctx);
318
319/*
320 * Legacy interfaces.
321 */
322int tls13_use_legacy_client(struct tls13_ctx *ctx);
323int tls13_use_legacy_server(struct tls13_ctx *ctx);
324int tls13_legacy_accept(SSL *ssl);
325int tls13_legacy_connect(SSL *ssl);
326int tls13_legacy_return_code(SSL *ssl, ssize_t ret);
327ssize_t tls13_legacy_wire_read_cb(void *buf, size_t n, void *arg);
328ssize_t tls13_legacy_wire_write_cb(const void *buf, size_t n, void *arg);
329ssize_t tls13_legacy_wire_flush_cb(void *arg);
330int tls13_legacy_pending(const SSL *ssl);
331int tls13_legacy_read_bytes(SSL *ssl, int type, unsigned char *buf, int len,
332 int peek);
333int tls13_legacy_write_bytes(SSL *ssl, int type, const void *buf, int len);
334int tls13_legacy_shutdown(SSL *ssl);
335int tls13_legacy_servername_process(struct tls13_ctx *ctx, uint8_t *alert);
336
337/*
338 * Message Types - RFC 8446, Section B.3.
339 *
340 * Values listed as "_RESERVED" were used in previous versions of TLS and are
341 * listed here for completeness. TLS 1.3 implementations MUST NOT send them but
342 * might receive them from older TLS implementations.
343 */
344#define TLS13_MT_HELLO_REQUEST_RESERVED 0
345#define TLS13_MT_CLIENT_HELLO 1
346#define TLS13_MT_SERVER_HELLO 2
347#define TLS13_MT_HELLO_VERIFY_REQUEST_RESERVED 3
348#define TLS13_MT_NEW_SESSION_TICKET 4
349#define TLS13_MT_END_OF_EARLY_DATA 5
350#define TLS13_MT_HELLO_RETRY_REQUEST_RESERVED 6
351#define TLS13_MT_ENCRYPTED_EXTENSIONS 8
352#define TLS13_MT_CERTIFICATE 11
353#define TLS13_MT_SERVER_KEY_EXCHANGE_RESERVED 12
354#define TLS13_MT_CERTIFICATE_REQUEST 13
355#define TLS13_MT_SERVER_HELLO_DONE_RESERVED 14
356#define TLS13_MT_CERTIFICATE_VERIFY 15
357#define TLS13_MT_CLIENT_KEY_EXCHANGE_RESERVED 16
358#define TLS13_MT_FINISHED 20
359#define TLS13_MT_CERTIFICATE_URL_RESERVED 21
360#define TLS13_MT_CERTIFICATE_STATUS_RESERVED 22
361#define TLS13_MT_SUPPLEMENTAL_DATA_RESERVED 23
362#define TLS13_MT_KEY_UPDATE 24
363#define TLS13_MT_MESSAGE_HASH 254
364
365int tls13_handshake_msg_record(struct tls13_ctx *ctx);
366int tls13_handshake_perform(struct tls13_ctx *ctx);
367
368int tls13_client_init(struct tls13_ctx *ctx);
369int tls13_server_init(struct tls13_ctx *ctx);
370int tls13_client_connect(struct tls13_ctx *ctx);
371int tls13_server_accept(struct tls13_ctx *ctx);
372
373int tls13_client_hello_send(struct tls13_ctx *ctx, CBB *cbb);
374int tls13_client_hello_sent(struct tls13_ctx *ctx);
375int tls13_client_hello_recv(struct tls13_ctx *ctx, CBS *cbs);
376int tls13_client_hello_retry_send(struct tls13_ctx *ctx, CBB *cbb);
377int tls13_client_hello_retry_recv(struct tls13_ctx *ctx, CBS *cbs);
378int tls13_client_end_of_early_data_send(struct tls13_ctx *ctx, CBB *cbb);
379int tls13_client_end_of_early_data_recv(struct tls13_ctx *ctx, CBS *cbs);
380int tls13_client_certificate_send(struct tls13_ctx *ctx, CBB *cbb);
381int tls13_client_certificate_recv(struct tls13_ctx *ctx, CBS *cbs);
382int tls13_client_certificate_verify_send(struct tls13_ctx *ctx, CBB *cbb);
383int tls13_client_certificate_verify_recv(struct tls13_ctx *ctx, CBS *cbs);
384int tls13_client_finished_recv(struct tls13_ctx *ctx, CBS *cbs);
385int tls13_client_finished_send(struct tls13_ctx *ctx, CBB *cbb);
386int tls13_client_finished_sent(struct tls13_ctx *ctx);
387int tls13_server_hello_recv(struct tls13_ctx *ctx, CBS *cbs);
388int tls13_server_hello_send(struct tls13_ctx *ctx, CBB *cbb);
389int tls13_server_hello_sent(struct tls13_ctx *ctx);
390int tls13_server_hello_retry_request_recv(struct tls13_ctx *ctx, CBS *cbs);
391int tls13_server_hello_retry_request_send(struct tls13_ctx *ctx, CBB *cbb);
392int tls13_server_hello_retry_request_sent(struct tls13_ctx *ctx);
393int tls13_server_encrypted_extensions_recv(struct tls13_ctx *ctx, CBS *cbs);
394int tls13_server_encrypted_extensions_send(struct tls13_ctx *ctx, CBB *cbb);
395int tls13_server_certificate_recv(struct tls13_ctx *ctx, CBS *cbs);
396int tls13_server_certificate_send(struct tls13_ctx *ctx, CBB *cbb);
397int tls13_server_certificate_request_recv(struct tls13_ctx *ctx, CBS *cbs);
398int tls13_server_certificate_request_send(struct tls13_ctx *ctx, CBB *cbb);
399int tls13_server_certificate_verify_send(struct tls13_ctx *ctx, CBB *cbb);
400int tls13_server_certificate_verify_recv(struct tls13_ctx *ctx, CBS *cbs);
401int tls13_server_finished_recv(struct tls13_ctx *ctx, CBS *cbs);
402int tls13_server_finished_send(struct tls13_ctx *ctx, CBB *cbb);
403int tls13_server_finished_sent(struct tls13_ctx *ctx);
404
405void tls13_error_clear(struct tls13_error *error);
406int tls13_cert_add(struct tls13_ctx *ctx, CBB *cbb, X509 *cert,
407 int(*build_extensions)(SSL *s, uint16_t msg_type, CBB *cbb));
408
409int tls13_synthetic_handshake_message(struct tls13_ctx *ctx);
410int tls13_clienthello_hash_init(struct tls13_ctx *ctx);
411void tls13_clienthello_hash_clear(struct ssl_handshake_tls13_st *hs);
412int tls13_clienthello_hash_update_bytes(struct tls13_ctx *ctx, void *data,
413 size_t len);
414int tls13_clienthello_hash_update(struct tls13_ctx *ctx, CBS *cbs);
415int tls13_clienthello_hash_finalize(struct tls13_ctx *ctx);
416int tls13_clienthello_hash_validate(struct tls13_ctx *ctx);
417
418int tls13_error_set(struct tls13_error *error, int code, int subcode,
419 const char *file, int line, const char *fmt, ...);
420int tls13_error_setx(struct tls13_error *error, int code, int subcode,
421 const char *file, int line, const char *fmt, ...);
422
423#define tls13_set_error(ctx, code, subcode, fmt, ...) \
424 tls13_error_set(&(ctx)->error, (code), (subcode), __FILE__, __LINE__, \
425 (fmt), __VA_ARGS__)
426#define tls13_set_errorx(ctx, code, subcode, fmt, ...) \
427 tls13_error_setx(&(ctx)->error, (code), (subcode), __FILE__, __LINE__, \
428 (fmt), __VA_ARGS__)
429
430int tls13_exporter(struct tls13_ctx *ctx, const uint8_t *label, size_t label_len,
431 const uint8_t *context_value, size_t context_value_len, uint8_t *out,
432 size_t out_len);
433
434extern const uint8_t tls13_downgrade_12[8];
435extern const uint8_t tls13_downgrade_11[8];
436extern const uint8_t tls13_hello_retry_request_hash[32];
437extern const uint8_t tls13_cert_verify_pad[64];
438extern const uint8_t tls13_cert_client_verify_context[];
439extern const uint8_t tls13_cert_server_verify_context[];
440
441__END_HIDDEN_DECLS
442
443#endif
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