2 * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include <openssl/ocsp.h>
11 #include "../ssl_locl.h"
12 #include "internal/cryptlib.h"
13 #include "statem_locl.h"
15 EXT_RETURN
tls_construct_ctos_renegotiate(SSL
*s
, WPACKET
*pkt
,
16 unsigned int context
, X509
*x
,
19 /* Add RI if renegotiating */
21 return EXT_RETURN_NOT_SENT
;
23 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_renegotiate
)
24 || !WPACKET_start_sub_packet_u16(pkt
)
25 || !WPACKET_sub_memcpy_u8(pkt
, s
->s3
->previous_client_finished
,
26 s
->s3
->previous_client_finished_len
)
27 || !WPACKET_close(pkt
)) {
28 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_RENEGOTIATE
,
29 ERR_R_INTERNAL_ERROR
);
30 return EXT_RETURN_FAIL
;
33 return EXT_RETURN_SENT
;
36 EXT_RETURN
tls_construct_ctos_server_name(SSL
*s
, WPACKET
*pkt
,
37 unsigned int context
, X509
*x
,
40 if (s
->ext
.hostname
== NULL
)
41 return EXT_RETURN_NOT_SENT
;
43 /* Add TLS extension servername to the Client Hello message */
44 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_server_name
)
45 /* Sub-packet for server_name extension */
46 || !WPACKET_start_sub_packet_u16(pkt
)
47 /* Sub-packet for servername list (always 1 hostname)*/
48 || !WPACKET_start_sub_packet_u16(pkt
)
49 || !WPACKET_put_bytes_u8(pkt
, TLSEXT_NAMETYPE_host_name
)
50 || !WPACKET_sub_memcpy_u16(pkt
, s
->ext
.hostname
,
51 strlen(s
->ext
.hostname
))
52 || !WPACKET_close(pkt
)
53 || !WPACKET_close(pkt
)) {
54 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_SERVER_NAME
,
55 ERR_R_INTERNAL_ERROR
);
56 return EXT_RETURN_FAIL
;
59 return EXT_RETURN_SENT
;
62 /* Push a Max Fragment Len extension into ClientHello */
63 EXT_RETURN
tls_construct_ctos_maxfragmentlen(SSL
*s
, WPACKET
*pkt
,
64 unsigned int context
, X509
*x
,
67 if (s
->ext
.max_fragment_len_mode
== TLSEXT_max_fragment_length_DISABLED
)
68 return EXT_RETURN_NOT_SENT
;
70 /* Add Max Fragment Length extension if client enabled it. */
72 * 4 bytes for this extension type and extension length
73 * 1 byte for the Max Fragment Length code value.
75 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_max_fragment_length
)
76 /* Sub-packet for Max Fragment Length extension (1 byte) */
77 || !WPACKET_start_sub_packet_u16(pkt
)
78 || !WPACKET_put_bytes_u8(pkt
, s
->ext
.max_fragment_len_mode
)
79 || !WPACKET_close(pkt
)) {
80 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
81 SSL_F_TLS_CONSTRUCT_CTOS_MAXFRAGMENTLEN
, ERR_R_INTERNAL_ERROR
);
82 return EXT_RETURN_FAIL
;
85 return EXT_RETURN_SENT
;
88 #ifndef OPENSSL_NO_SRP
89 EXT_RETURN
tls_construct_ctos_srp(SSL
*s
, WPACKET
*pkt
, unsigned int context
,
90 X509
*x
, size_t chainidx
)
92 /* Add SRP username if there is one */
93 if (s
->srp_ctx
.login
== NULL
)
94 return EXT_RETURN_NOT_SENT
;
96 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_srp
)
97 /* Sub-packet for SRP extension */
98 || !WPACKET_start_sub_packet_u16(pkt
)
99 || !WPACKET_start_sub_packet_u8(pkt
)
100 /* login must not be zero...internal error if so */
101 || !WPACKET_set_flags(pkt
, WPACKET_FLAGS_NON_ZERO_LENGTH
)
102 || !WPACKET_memcpy(pkt
, s
->srp_ctx
.login
,
103 strlen(s
->srp_ctx
.login
))
104 || !WPACKET_close(pkt
)
105 || !WPACKET_close(pkt
)) {
106 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_SRP
,
107 ERR_R_INTERNAL_ERROR
);
108 return EXT_RETURN_FAIL
;
111 return EXT_RETURN_SENT
;
115 #ifndef OPENSSL_NO_EC
116 static int use_ecc(SSL
*s
)
119 unsigned long alg_k
, alg_a
;
120 STACK_OF(SSL_CIPHER
) *cipher_stack
= NULL
;
122 /* See if we support any ECC ciphersuites */
123 if (s
->version
== SSL3_VERSION
)
126 cipher_stack
= SSL_get1_supported_ciphers(s
);
127 end
= sk_SSL_CIPHER_num(cipher_stack
);
128 for (i
= 0; i
< end
; i
++) {
129 const SSL_CIPHER
*c
= sk_SSL_CIPHER_value(cipher_stack
, i
);
131 alg_k
= c
->algorithm_mkey
;
132 alg_a
= c
->algorithm_auth
;
133 if ((alg_k
& (SSL_kECDHE
| SSL_kECDHEPSK
))
134 || (alg_a
& SSL_aECDSA
)
135 || c
->min_tls
>= TLS1_3_VERSION
) {
141 sk_SSL_CIPHER_free(cipher_stack
);
145 EXT_RETURN
tls_construct_ctos_ec_pt_formats(SSL
*s
, WPACKET
*pkt
,
146 unsigned int context
, X509
*x
,
149 const unsigned char *pformats
;
153 return EXT_RETURN_NOT_SENT
;
155 /* Add TLS extension ECPointFormats to the ClientHello message */
156 tls1_get_formatlist(s
, &pformats
, &num_formats
);
158 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_ec_point_formats
)
159 /* Sub-packet for formats extension */
160 || !WPACKET_start_sub_packet_u16(pkt
)
161 || !WPACKET_sub_memcpy_u8(pkt
, pformats
, num_formats
)
162 || !WPACKET_close(pkt
)) {
163 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
164 SSL_F_TLS_CONSTRUCT_CTOS_EC_PT_FORMATS
, ERR_R_INTERNAL_ERROR
);
165 return EXT_RETURN_FAIL
;
168 return EXT_RETURN_SENT
;
171 EXT_RETURN
tls_construct_ctos_supported_groups(SSL
*s
, WPACKET
*pkt
,
172 unsigned int context
, X509
*x
,
175 const uint16_t *pgroups
= NULL
;
176 size_t num_groups
= 0, i
;
179 return EXT_RETURN_NOT_SENT
;
182 * Add TLS extension supported_groups to the ClientHello message
184 /* TODO(TLS1.3): Add support for DHE groups */
185 tls1_get_supported_groups(s
, &pgroups
, &num_groups
);
187 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_supported_groups
)
188 /* Sub-packet for supported_groups extension */
189 || !WPACKET_start_sub_packet_u16(pkt
)
190 || !WPACKET_start_sub_packet_u16(pkt
)) {
191 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
192 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS
,
193 ERR_R_INTERNAL_ERROR
);
194 return EXT_RETURN_FAIL
;
196 /* Copy curve ID if supported */
197 for (i
= 0; i
< num_groups
; i
++) {
198 uint16_t ctmp
= pgroups
[i
];
200 if (tls_curve_allowed(s
, ctmp
, SSL_SECOP_CURVE_SUPPORTED
)) {
201 if (!WPACKET_put_bytes_u16(pkt
, ctmp
)) {
202 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
203 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS
,
204 ERR_R_INTERNAL_ERROR
);
205 return EXT_RETURN_FAIL
;
209 if (!WPACKET_close(pkt
) || !WPACKET_close(pkt
)) {
210 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
211 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS
,
212 ERR_R_INTERNAL_ERROR
);
213 return EXT_RETURN_FAIL
;
216 return EXT_RETURN_SENT
;
220 EXT_RETURN
tls_construct_ctos_session_ticket(SSL
*s
, WPACKET
*pkt
,
221 unsigned int context
, X509
*x
,
226 if (!tls_use_ticket(s
))
227 return EXT_RETURN_NOT_SENT
;
229 if (!s
->new_session
&& s
->session
!= NULL
230 && s
->session
->ext
.tick
!= NULL
231 && s
->session
->ssl_version
!= TLS1_3_VERSION
) {
232 ticklen
= s
->session
->ext
.ticklen
;
233 } else if (s
->session
&& s
->ext
.session_ticket
!= NULL
234 && s
->ext
.session_ticket
->data
!= NULL
) {
235 ticklen
= s
->ext
.session_ticket
->length
;
236 s
->session
->ext
.tick
= OPENSSL_malloc(ticklen
);
237 if (s
->session
->ext
.tick
== NULL
) {
238 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
239 SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET
,
240 ERR_R_INTERNAL_ERROR
);
241 return EXT_RETURN_FAIL
;
243 memcpy(s
->session
->ext
.tick
,
244 s
->ext
.session_ticket
->data
, ticklen
);
245 s
->session
->ext
.ticklen
= ticklen
;
250 if (ticklen
== 0 && s
->ext
.session_ticket
!= NULL
&&
251 s
->ext
.session_ticket
->data
== NULL
)
252 return EXT_RETURN_NOT_SENT
;
254 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_session_ticket
)
255 || !WPACKET_sub_memcpy_u16(pkt
, s
->session
->ext
.tick
, ticklen
)) {
256 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
257 SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET
, ERR_R_INTERNAL_ERROR
);
258 return EXT_RETURN_FAIL
;
261 return EXT_RETURN_SENT
;
264 EXT_RETURN
tls_construct_ctos_sig_algs(SSL
*s
, WPACKET
*pkt
,
265 unsigned int context
, X509
*x
,
269 const uint16_t *salg
;
271 if (!SSL_CLIENT_USE_SIGALGS(s
))
272 return EXT_RETURN_NOT_SENT
;
274 salglen
= tls12_get_psigalgs(s
, 1, &salg
);
275 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_signature_algorithms
)
276 /* Sub-packet for sig-algs extension */
277 || !WPACKET_start_sub_packet_u16(pkt
)
278 /* Sub-packet for the actual list */
279 || !WPACKET_start_sub_packet_u16(pkt
)
280 || !tls12_copy_sigalgs(s
, pkt
, salg
, salglen
)
281 || !WPACKET_close(pkt
)
282 || !WPACKET_close(pkt
)) {
283 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_SIG_ALGS
,
284 ERR_R_INTERNAL_ERROR
);
285 return EXT_RETURN_FAIL
;
288 return EXT_RETURN_SENT
;
291 #ifndef OPENSSL_NO_OCSP
292 EXT_RETURN
tls_construct_ctos_status_request(SSL
*s
, WPACKET
*pkt
,
293 unsigned int context
, X509
*x
,
298 /* This extension isn't defined for client Certificates */
300 return EXT_RETURN_NOT_SENT
;
302 if (s
->ext
.status_type
!= TLSEXT_STATUSTYPE_ocsp
)
303 return EXT_RETURN_NOT_SENT
;
305 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_status_request
)
306 /* Sub-packet for status request extension */
307 || !WPACKET_start_sub_packet_u16(pkt
)
308 || !WPACKET_put_bytes_u8(pkt
, TLSEXT_STATUSTYPE_ocsp
)
309 /* Sub-packet for the ids */
310 || !WPACKET_start_sub_packet_u16(pkt
)) {
311 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
312 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
, ERR_R_INTERNAL_ERROR
);
313 return EXT_RETURN_FAIL
;
315 for (i
= 0; i
< sk_OCSP_RESPID_num(s
->ext
.ocsp
.ids
); i
++) {
316 unsigned char *idbytes
;
317 OCSP_RESPID
*id
= sk_OCSP_RESPID_value(s
->ext
.ocsp
.ids
, i
);
318 int idlen
= i2d_OCSP_RESPID(id
, NULL
);
321 /* Sub-packet for an individual id */
322 || !WPACKET_sub_allocate_bytes_u16(pkt
, idlen
, &idbytes
)
323 || i2d_OCSP_RESPID(id
, &idbytes
) != idlen
) {
324 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
325 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
,
326 ERR_R_INTERNAL_ERROR
);
327 return EXT_RETURN_FAIL
;
330 if (!WPACKET_close(pkt
)
331 || !WPACKET_start_sub_packet_u16(pkt
)) {
332 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
333 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
, ERR_R_INTERNAL_ERROR
);
334 return EXT_RETURN_FAIL
;
336 if (s
->ext
.ocsp
.exts
) {
337 unsigned char *extbytes
;
338 int extlen
= i2d_X509_EXTENSIONS(s
->ext
.ocsp
.exts
, NULL
);
341 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
342 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
,
343 ERR_R_INTERNAL_ERROR
);
344 return EXT_RETURN_FAIL
;
346 if (!WPACKET_allocate_bytes(pkt
, extlen
, &extbytes
)
347 || i2d_X509_EXTENSIONS(s
->ext
.ocsp
.exts
, &extbytes
)
349 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
350 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
,
351 ERR_R_INTERNAL_ERROR
);
352 return EXT_RETURN_FAIL
;
355 if (!WPACKET_close(pkt
) || !WPACKET_close(pkt
)) {
356 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
357 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
, ERR_R_INTERNAL_ERROR
);
358 return EXT_RETURN_FAIL
;
361 return EXT_RETURN_SENT
;
365 #ifndef OPENSSL_NO_NEXTPROTONEG
366 EXT_RETURN
tls_construct_ctos_npn(SSL
*s
, WPACKET
*pkt
, unsigned int context
,
367 X509
*x
, size_t chainidx
)
369 if (s
->ctx
->ext
.npn_select_cb
== NULL
|| !SSL_IS_FIRST_HANDSHAKE(s
))
370 return EXT_RETURN_NOT_SENT
;
373 * The client advertises an empty extension to indicate its support
374 * for Next Protocol Negotiation
376 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_next_proto_neg
)
377 || !WPACKET_put_bytes_u16(pkt
, 0)) {
378 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_NPN
,
379 ERR_R_INTERNAL_ERROR
);
380 return EXT_RETURN_FAIL
;
383 return EXT_RETURN_SENT
;
387 EXT_RETURN
tls_construct_ctos_alpn(SSL
*s
, WPACKET
*pkt
, unsigned int context
,
388 X509
*x
, size_t chainidx
)
390 s
->s3
->alpn_sent
= 0;
392 if (s
->ext
.alpn
== NULL
|| !SSL_IS_FIRST_HANDSHAKE(s
))
393 return EXT_RETURN_NOT_SENT
;
395 if (!WPACKET_put_bytes_u16(pkt
,
396 TLSEXT_TYPE_application_layer_protocol_negotiation
)
397 /* Sub-packet ALPN extension */
398 || !WPACKET_start_sub_packet_u16(pkt
)
399 || !WPACKET_sub_memcpy_u16(pkt
, s
->ext
.alpn
, s
->ext
.alpn_len
)
400 || !WPACKET_close(pkt
)) {
401 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_ALPN
,
402 ERR_R_INTERNAL_ERROR
);
403 return EXT_RETURN_FAIL
;
405 s
->s3
->alpn_sent
= 1;
407 return EXT_RETURN_SENT
;
411 #ifndef OPENSSL_NO_SRTP
412 EXT_RETURN
tls_construct_ctos_use_srtp(SSL
*s
, WPACKET
*pkt
,
413 unsigned int context
, X509
*x
,
416 STACK_OF(SRTP_PROTECTION_PROFILE
) *clnt
= SSL_get_srtp_profiles(s
);
420 return EXT_RETURN_NOT_SENT
;
422 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_use_srtp
)
423 /* Sub-packet for SRTP extension */
424 || !WPACKET_start_sub_packet_u16(pkt
)
425 /* Sub-packet for the protection profile list */
426 || !WPACKET_start_sub_packet_u16(pkt
)) {
427 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP
,
428 ERR_R_INTERNAL_ERROR
);
429 return EXT_RETURN_FAIL
;
432 end
= sk_SRTP_PROTECTION_PROFILE_num(clnt
);
433 for (i
= 0; i
< end
; i
++) {
434 const SRTP_PROTECTION_PROFILE
*prof
=
435 sk_SRTP_PROTECTION_PROFILE_value(clnt
, i
);
437 if (prof
== NULL
|| !WPACKET_put_bytes_u16(pkt
, prof
->id
)) {
438 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
439 SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP
, ERR_R_INTERNAL_ERROR
);
440 return EXT_RETURN_FAIL
;
443 if (!WPACKET_close(pkt
)
444 /* Add an empty use_mki value */
445 || !WPACKET_put_bytes_u8(pkt
, 0)
446 || !WPACKET_close(pkt
)) {
447 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP
,
448 ERR_R_INTERNAL_ERROR
);
449 return EXT_RETURN_FAIL
;
452 return EXT_RETURN_SENT
;
456 EXT_RETURN
tls_construct_ctos_etm(SSL
*s
, WPACKET
*pkt
, unsigned int context
,
457 X509
*x
, size_t chainidx
)
459 if (s
->options
& SSL_OP_NO_ENCRYPT_THEN_MAC
)
460 return EXT_RETURN_NOT_SENT
;
462 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_encrypt_then_mac
)
463 || !WPACKET_put_bytes_u16(pkt
, 0)) {
464 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_ETM
,
465 ERR_R_INTERNAL_ERROR
);
466 return EXT_RETURN_FAIL
;
469 return EXT_RETURN_SENT
;
472 #ifndef OPENSSL_NO_CT
473 EXT_RETURN
tls_construct_ctos_sct(SSL
*s
, WPACKET
*pkt
, unsigned int context
,
474 X509
*x
, size_t chainidx
)
476 if (s
->ct_validation_callback
== NULL
)
477 return EXT_RETURN_NOT_SENT
;
479 /* Not defined for client Certificates */
481 return EXT_RETURN_NOT_SENT
;
483 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_signed_certificate_timestamp
)
484 || !WPACKET_put_bytes_u16(pkt
, 0)) {
485 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_SCT
,
486 ERR_R_INTERNAL_ERROR
);
487 return EXT_RETURN_FAIL
;
490 return EXT_RETURN_SENT
;
494 EXT_RETURN
tls_construct_ctos_ems(SSL
*s
, WPACKET
*pkt
, unsigned int context
,
495 X509
*x
, size_t chainidx
)
497 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_extended_master_secret
)
498 || !WPACKET_put_bytes_u16(pkt
, 0)) {
499 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_EMS
,
500 ERR_R_INTERNAL_ERROR
);
501 return EXT_RETURN_FAIL
;
504 return EXT_RETURN_SENT
;
507 EXT_RETURN
tls_construct_ctos_supported_versions(SSL
*s
, WPACKET
*pkt
,
508 unsigned int context
, X509
*x
,
511 int currv
, min_version
, max_version
, reason
;
513 reason
= ssl_get_min_max_version(s
, &min_version
, &max_version
, NULL
);
515 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
516 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS
, reason
);
517 return EXT_RETURN_FAIL
;
521 * Don't include this if we can't negotiate TLSv1.3. We can do a straight
522 * comparison here because we will never be called in DTLS.
524 if (max_version
< TLS1_3_VERSION
)
525 return EXT_RETURN_NOT_SENT
;
527 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_supported_versions
)
528 || !WPACKET_start_sub_packet_u16(pkt
)
529 || !WPACKET_start_sub_packet_u8(pkt
)) {
530 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
531 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS
,
532 ERR_R_INTERNAL_ERROR
);
533 return EXT_RETURN_FAIL
;
536 for (currv
= max_version
; currv
>= min_version
; currv
--) {
537 if (!WPACKET_put_bytes_u16(pkt
, currv
)) {
538 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
539 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS
,
540 ERR_R_INTERNAL_ERROR
);
541 return EXT_RETURN_FAIL
;
544 if (!WPACKET_close(pkt
) || !WPACKET_close(pkt
)) {
545 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
546 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS
,
547 ERR_R_INTERNAL_ERROR
);
548 return EXT_RETURN_FAIL
;
551 return EXT_RETURN_SENT
;
555 * Construct a psk_kex_modes extension.
557 EXT_RETURN
tls_construct_ctos_psk_kex_modes(SSL
*s
, WPACKET
*pkt
,
558 unsigned int context
, X509
*x
,
561 #ifndef OPENSSL_NO_TLS1_3
562 int nodhe
= s
->options
& SSL_OP_ALLOW_NO_DHE_KEX
;
564 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_psk_kex_modes
)
565 || !WPACKET_start_sub_packet_u16(pkt
)
566 || !WPACKET_start_sub_packet_u8(pkt
)
567 || !WPACKET_put_bytes_u8(pkt
, TLSEXT_KEX_MODE_KE_DHE
)
568 || (nodhe
&& !WPACKET_put_bytes_u8(pkt
, TLSEXT_KEX_MODE_KE
))
569 || !WPACKET_close(pkt
)
570 || !WPACKET_close(pkt
)) {
571 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
572 SSL_F_TLS_CONSTRUCT_CTOS_PSK_KEX_MODES
, ERR_R_INTERNAL_ERROR
);
573 return EXT_RETURN_FAIL
;
576 s
->ext
.psk_kex_mode
= TLSEXT_KEX_MODE_FLAG_KE_DHE
;
578 s
->ext
.psk_kex_mode
|= TLSEXT_KEX_MODE_FLAG_KE
;
581 return EXT_RETURN_SENT
;
584 #ifndef OPENSSL_NO_TLS1_3
585 static int add_key_share(SSL
*s
, WPACKET
*pkt
, unsigned int curve_id
)
587 unsigned char *encoded_point
= NULL
;
588 EVP_PKEY
*key_share_key
= NULL
;
591 if (s
->s3
->tmp
.pkey
!= NULL
) {
592 if (!ossl_assert(s
->hello_retry_request
== SSL_HRR_PENDING
)) {
593 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_ADD_KEY_SHARE
,
594 ERR_R_INTERNAL_ERROR
);
598 * Could happen if we got an HRR that wasn't requesting a new key_share
600 key_share_key
= s
->s3
->tmp
.pkey
;
602 key_share_key
= ssl_generate_pkey_group(s
, curve_id
);
603 if (key_share_key
== NULL
) {
604 /* SSLfatal() already called */
609 /* Encode the public key. */
610 encodedlen
= EVP_PKEY_get1_tls_encodedpoint(key_share_key
,
612 if (encodedlen
== 0) {
613 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_ADD_KEY_SHARE
, ERR_R_EC_LIB
);
617 /* Create KeyShareEntry */
618 if (!WPACKET_put_bytes_u16(pkt
, curve_id
)
619 || !WPACKET_sub_memcpy_u16(pkt
, encoded_point
, encodedlen
)) {
620 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_ADD_KEY_SHARE
,
621 ERR_R_INTERNAL_ERROR
);
626 * TODO(TLS1.3): When changing to send more than one key_share we're
627 * going to need to be able to save more than one EVP_PKEY. For now
628 * we reuse the existing tmp.pkey
630 s
->s3
->tmp
.pkey
= key_share_key
;
631 s
->s3
->group_id
= curve_id
;
632 OPENSSL_free(encoded_point
);
636 if (s
->s3
->tmp
.pkey
== NULL
)
637 EVP_PKEY_free(key_share_key
);
638 OPENSSL_free(encoded_point
);
643 EXT_RETURN
tls_construct_ctos_key_share(SSL
*s
, WPACKET
*pkt
,
644 unsigned int context
, X509
*x
,
647 #ifndef OPENSSL_NO_TLS1_3
648 size_t i
, num_groups
= 0;
649 const uint16_t *pgroups
= NULL
;
650 uint16_t curve_id
= 0;
652 /* key_share extension */
653 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_key_share
)
654 /* Extension data sub-packet */
655 || !WPACKET_start_sub_packet_u16(pkt
)
656 /* KeyShare list sub-packet */
657 || !WPACKET_start_sub_packet_u16(pkt
)) {
658 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE
,
659 ERR_R_INTERNAL_ERROR
);
660 return EXT_RETURN_FAIL
;
663 tls1_get_supported_groups(s
, &pgroups
, &num_groups
);
666 * TODO(TLS1.3): Make the number of key_shares sent configurable. For
669 if (s
->s3
->group_id
!= 0) {
670 curve_id
= s
->s3
->group_id
;
672 for (i
= 0; i
< num_groups
; i
++) {
674 if (!tls_curve_allowed(s
, pgroups
[i
], SSL_SECOP_CURVE_SUPPORTED
))
677 curve_id
= pgroups
[i
];
683 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE
,
684 SSL_R_NO_SUITABLE_KEY_SHARE
);
685 return EXT_RETURN_FAIL
;
688 if (!add_key_share(s
, pkt
, curve_id
)) {
689 /* SSLfatal() already called */
690 return EXT_RETURN_FAIL
;
693 if (!WPACKET_close(pkt
) || !WPACKET_close(pkt
)) {
694 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE
,
695 ERR_R_INTERNAL_ERROR
);
696 return EXT_RETURN_FAIL
;
698 return EXT_RETURN_SENT
;
700 return EXT_RETURN_NOT_SENT
;
704 EXT_RETURN
tls_construct_ctos_cookie(SSL
*s
, WPACKET
*pkt
, unsigned int context
,
705 X509
*x
, size_t chainidx
)
707 EXT_RETURN ret
= EXT_RETURN_FAIL
;
709 /* Should only be set if we've had an HRR */
710 if (s
->ext
.tls13_cookie_len
== 0)
711 return EXT_RETURN_NOT_SENT
;
713 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_cookie
)
714 /* Extension data sub-packet */
715 || !WPACKET_start_sub_packet_u16(pkt
)
716 || !WPACKET_sub_memcpy_u16(pkt
, s
->ext
.tls13_cookie
,
717 s
->ext
.tls13_cookie_len
)
718 || !WPACKET_close(pkt
)) {
719 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_COOKIE
,
720 ERR_R_INTERNAL_ERROR
);
724 ret
= EXT_RETURN_SENT
;
726 OPENSSL_free(s
->ext
.tls13_cookie
);
727 s
->ext
.tls13_cookie
= NULL
;
728 s
->ext
.tls13_cookie_len
= 0;
733 EXT_RETURN
tls_construct_ctos_early_data(SSL
*s
, WPACKET
*pkt
,
734 unsigned int context
, X509
*x
,
737 #ifndef OPENSSL_NO_PSK
738 char identity
[PSK_MAX_IDENTITY_LEN
+ 1];
739 #endif /* OPENSSL_NO_PSK */
740 const unsigned char *id
= NULL
;
742 SSL_SESSION
*psksess
= NULL
;
743 SSL_SESSION
*edsess
= NULL
;
744 const EVP_MD
*handmd
= NULL
;
746 if (s
->hello_retry_request
== SSL_HRR_PENDING
)
747 handmd
= ssl_handshake_md(s
);
749 if (s
->psk_use_session_cb
!= NULL
750 && (!s
->psk_use_session_cb(s
, handmd
, &id
, &idlen
, &psksess
)
752 && psksess
->ssl_version
!= TLS1_3_VERSION
))) {
753 SSL_SESSION_free(psksess
);
754 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA
,
756 return EXT_RETURN_FAIL
;
759 #ifndef OPENSSL_NO_PSK
760 if (psksess
== NULL
&& s
->psk_client_callback
!= NULL
) {
761 unsigned char psk
[PSK_MAX_PSK_LEN
];
764 memset(identity
, 0, sizeof(identity
));
765 psklen
= s
->psk_client_callback(s
, NULL
, identity
, sizeof(identity
) - 1,
768 if (psklen
> PSK_MAX_PSK_LEN
) {
769 SSLfatal(s
, SSL_AD_HANDSHAKE_FAILURE
,
770 SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA
, ERR_R_INTERNAL_ERROR
);
771 return EXT_RETURN_FAIL
;
772 } else if (psklen
> 0) {
773 const unsigned char tls13_aes128gcmsha256_id
[] = { 0x13, 0x01 };
774 const SSL_CIPHER
*cipher
;
776 idlen
= strlen(identity
);
777 if (idlen
> PSK_MAX_IDENTITY_LEN
) {
778 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
779 SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA
,
780 ERR_R_INTERNAL_ERROR
);
781 return EXT_RETURN_FAIL
;
783 id
= (unsigned char *)identity
;
786 * We found a PSK using an old style callback. We don't know
787 * the digest so we default to SHA256 as per the TLSv1.3 spec
789 cipher
= SSL_CIPHER_find(s
, tls13_aes128gcmsha256_id
);
790 if (cipher
== NULL
) {
791 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
792 SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA
,
793 ERR_R_INTERNAL_ERROR
);
794 return EXT_RETURN_FAIL
;
797 psksess
= SSL_SESSION_new();
799 || !SSL_SESSION_set1_master_key(psksess
, psk
, psklen
)
800 || !SSL_SESSION_set_cipher(psksess
, cipher
)
801 || !SSL_SESSION_set_protocol_version(psksess
, TLS1_3_VERSION
)) {
802 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
803 SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA
,
804 ERR_R_INTERNAL_ERROR
);
805 OPENSSL_cleanse(psk
, psklen
);
806 return EXT_RETURN_FAIL
;
808 OPENSSL_cleanse(psk
, psklen
);
811 #endif /* OPENSSL_NO_PSK */
813 SSL_SESSION_free(s
->psksession
);
814 s
->psksession
= psksess
;
815 if (psksess
!= NULL
) {
816 OPENSSL_free(s
->psksession_id
);
817 s
->psksession_id
= OPENSSL_memdup(id
, idlen
);
818 if (s
->psksession_id
== NULL
) {
819 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
820 SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA
, ERR_R_INTERNAL_ERROR
);
821 return EXT_RETURN_FAIL
;
823 s
->psksession_id_len
= idlen
;
826 if (s
->early_data_state
!= SSL_EARLY_DATA_CONNECTING
827 || (s
->session
->ext
.max_early_data
== 0
828 && (psksess
== NULL
|| psksess
->ext
.max_early_data
== 0))) {
829 s
->max_early_data
= 0;
830 return EXT_RETURN_NOT_SENT
;
832 edsess
= s
->session
->ext
.max_early_data
!= 0 ? s
->session
: psksess
;
833 s
->max_early_data
= edsess
->ext
.max_early_data
;
835 if (edsess
->ext
.hostname
!= NULL
) {
836 if (s
->ext
.hostname
== NULL
837 || (s
->ext
.hostname
!= NULL
838 && strcmp(s
->ext
.hostname
, edsess
->ext
.hostname
) != 0)) {
839 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
840 SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA
,
841 SSL_R_INCONSISTENT_EARLY_DATA_SNI
);
842 return EXT_RETURN_FAIL
;
846 if ((s
->ext
.alpn
== NULL
&& edsess
->ext
.alpn_selected
!= NULL
)) {
847 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA
,
848 SSL_R_INCONSISTENT_EARLY_DATA_ALPN
);
849 return EXT_RETURN_FAIL
;
853 * Verify that we are offering an ALPN protocol consistent with the early
856 if (edsess
->ext
.alpn_selected
!= NULL
) {
857 PACKET prots
, alpnpkt
;
860 if (!PACKET_buf_init(&prots
, s
->ext
.alpn
, s
->ext
.alpn_len
)) {
861 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
862 SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA
, ERR_R_INTERNAL_ERROR
);
863 return EXT_RETURN_FAIL
;
865 while (PACKET_get_length_prefixed_1(&prots
, &alpnpkt
)) {
866 if (PACKET_equal(&alpnpkt
, edsess
->ext
.alpn_selected
,
867 edsess
->ext
.alpn_selected_len
)) {
873 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
874 SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA
,
875 SSL_R_INCONSISTENT_EARLY_DATA_ALPN
);
876 return EXT_RETURN_FAIL
;
880 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_early_data
)
881 || !WPACKET_start_sub_packet_u16(pkt
)
882 || !WPACKET_close(pkt
)) {
883 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA
,
884 ERR_R_INTERNAL_ERROR
);
885 return EXT_RETURN_FAIL
;
889 * We set this to rejected here. Later, if the server acknowledges the
890 * extension, we set it to accepted.
892 s
->ext
.early_data
= SSL_EARLY_DATA_REJECTED
;
893 s
->ext
.early_data_ok
= 1;
895 return EXT_RETURN_SENT
;
898 #define F5_WORKAROUND_MIN_MSG_LEN 0xff
899 #define F5_WORKAROUND_MAX_MSG_LEN 0x200
902 * PSK pre binder overhead =
903 * 2 bytes for TLSEXT_TYPE_psk
904 * 2 bytes for extension length
905 * 2 bytes for identities list length
906 * 2 bytes for identity length
907 * 4 bytes for obfuscated_ticket_age
908 * 2 bytes for binder list length
909 * 1 byte for binder length
910 * The above excludes the number of bytes for the identity itself and the
911 * subsequent binder bytes
913 #define PSK_PRE_BINDER_OVERHEAD (2 + 2 + 2 + 2 + 4 + 2 + 1)
915 EXT_RETURN
tls_construct_ctos_padding(SSL
*s
, WPACKET
*pkt
,
916 unsigned int context
, X509
*x
,
919 unsigned char *padbytes
;
922 if ((s
->options
& SSL_OP_TLSEXT_PADDING
) == 0)
923 return EXT_RETURN_NOT_SENT
;
926 * Add padding to workaround bugs in F5 terminators. See RFC7685.
927 * This code calculates the length of all extensions added so far but
928 * excludes the PSK extension (because that MUST be written last). Therefore
929 * this extension MUST always appear second to last.
931 if (!WPACKET_get_total_written(pkt
, &hlen
)) {
932 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_PADDING
,
933 ERR_R_INTERNAL_ERROR
);
934 return EXT_RETURN_FAIL
;
938 * If we're going to send a PSK then that will be written out after this
939 * extension, so we need to calculate how long it is going to be.
941 if (s
->session
->ssl_version
== TLS1_3_VERSION
942 && s
->session
->ext
.ticklen
!= 0
943 && s
->session
->cipher
!= NULL
) {
944 const EVP_MD
*md
= ssl_md(s
->session
->cipher
->algorithm2
);
948 * Add the fixed PSK overhead, the identity length and the binder
951 hlen
+= PSK_PRE_BINDER_OVERHEAD
+ s
->session
->ext
.ticklen
956 if (hlen
> F5_WORKAROUND_MIN_MSG_LEN
&& hlen
< F5_WORKAROUND_MAX_MSG_LEN
) {
957 /* Calculate the amount of padding we need to add */
958 hlen
= F5_WORKAROUND_MAX_MSG_LEN
- hlen
;
961 * Take off the size of extension header itself (2 bytes for type and
962 * 2 bytes for length bytes), but ensure that the extension is at least
963 * 1 byte long so as not to have an empty extension last (WebSphere 7.x,
964 * 8.x are intolerant of that condition)
971 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_padding
)
972 || !WPACKET_sub_allocate_bytes_u16(pkt
, hlen
, &padbytes
)) {
973 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_PADDING
,
974 ERR_R_INTERNAL_ERROR
);
975 return EXT_RETURN_FAIL
;
977 memset(padbytes
, 0, hlen
);
980 return EXT_RETURN_SENT
;
984 * Construct the pre_shared_key extension
986 EXT_RETURN
tls_construct_ctos_psk(SSL
*s
, WPACKET
*pkt
, unsigned int context
,
987 X509
*x
, size_t chainidx
)
989 #ifndef OPENSSL_NO_TLS1_3
990 uint32_t now
, agesec
, agems
= 0;
991 size_t reshashsize
= 0, pskhashsize
= 0, binderoffset
, msglen
;
992 unsigned char *resbinder
= NULL
, *pskbinder
= NULL
, *msgstart
= NULL
;
993 const EVP_MD
*handmd
= NULL
, *mdres
= NULL
, *mdpsk
= NULL
;
996 s
->session
->ext
.tick_identity
= TLSEXT_PSK_BAD_IDENTITY
;
999 * Note: At this stage of the code we only support adding a single
1000 * resumption PSK. If we add support for multiple PSKs then the length
1001 * calculations in the padding extension will need to be adjusted.
1005 * If this is an incompatible or new session then we have nothing to resume
1006 * so don't add this extension.
1008 if (s
->session
->ssl_version
!= TLS1_3_VERSION
1009 || (s
->session
->ext
.ticklen
== 0 && s
->psksession
== NULL
))
1010 return EXT_RETURN_NOT_SENT
;
1012 if (s
->hello_retry_request
== SSL_HRR_PENDING
)
1013 handmd
= ssl_handshake_md(s
);
1015 if (s
->session
->ext
.ticklen
!= 0) {
1016 /* Get the digest associated with the ciphersuite in the session */
1017 if (s
->session
->cipher
== NULL
) {
1018 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_PSK
,
1019 ERR_R_INTERNAL_ERROR
);
1020 return EXT_RETURN_FAIL
;
1022 mdres
= ssl_md(s
->session
->cipher
->algorithm2
);
1023 if (mdres
== NULL
) {
1025 * Don't recognize this cipher so we can't use the session.
1031 if (s
->hello_retry_request
== SSL_HRR_PENDING
&& mdres
!= handmd
) {
1033 * Selected ciphersuite hash does not match the hash for the session
1034 * so we can't use it.
1040 * Technically the C standard just says time() returns a time_t and says
1041 * nothing about the encoding of that type. In practice most
1042 * implementations follow POSIX which holds it as an integral type in
1043 * seconds since epoch. We've already made the assumption that we can do
1044 * this in multiple places in the code, so portability shouldn't be an
1047 now
= (uint32_t)time(NULL
);
1048 agesec
= now
- (uint32_t)s
->session
->time
;
1050 * We calculate the age in seconds but the server may work in ms. Due to
1051 * rounding errors we could overestimate the age by up to 1s. It is
1052 * better to underestimate it. Otherwise, if the RTT is very short, when
1053 * the server calculates the age reported by the client it could be
1054 * bigger than the age calculated on the server - which should never
1060 if (s
->session
->ext
.tick_lifetime_hint
< agesec
) {
1061 /* Ticket is too old. Ignore it. */
1066 * Calculate age in ms. We're just doing it to nearest second. Should be
1069 agems
= agesec
* (uint32_t)1000;
1071 if (agesec
!= 0 && agems
/ (uint32_t)1000 != agesec
) {
1073 * Overflow. Shouldn't happen unless this is a *really* old session.
1074 * If so we just ignore it.
1080 * Obfuscate the age. Overflow here is fine, this addition is supposed
1083 agems
+= s
->session
->ext
.tick_age_add
;
1085 reshashsize
= EVP_MD_size(mdres
);
1090 if (!dores
&& s
->psksession
== NULL
)
1091 return EXT_RETURN_NOT_SENT
;
1093 if (s
->psksession
!= NULL
) {
1094 mdpsk
= ssl_md(s
->psksession
->cipher
->algorithm2
);
1095 if (mdpsk
== NULL
) {
1097 * Don't recognize this cipher so we can't use the session.
1098 * If this happens it's an application bug.
1100 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_PSK
,
1102 return EXT_RETURN_FAIL
;
1105 if (s
->hello_retry_request
== SSL_HRR_PENDING
&& mdpsk
!= handmd
) {
1107 * Selected ciphersuite hash does not match the hash for the PSK
1108 * session. This is an application bug.
1110 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_PSK
,
1112 return EXT_RETURN_FAIL
;
1115 pskhashsize
= EVP_MD_size(mdpsk
);
1118 /* Create the extension, but skip over the binder for now */
1119 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_psk
)
1120 || !WPACKET_start_sub_packet_u16(pkt
)
1121 || !WPACKET_start_sub_packet_u16(pkt
)) {
1122 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_PSK
,
1123 ERR_R_INTERNAL_ERROR
);
1124 return EXT_RETURN_FAIL
;
1128 if (!WPACKET_sub_memcpy_u16(pkt
, s
->session
->ext
.tick
,
1129 s
->session
->ext
.ticklen
)
1130 || !WPACKET_put_bytes_u32(pkt
, agems
)) {
1131 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_PSK
,
1132 ERR_R_INTERNAL_ERROR
);
1133 return EXT_RETURN_FAIL
;
1137 if (s
->psksession
!= NULL
) {
1138 if (!WPACKET_sub_memcpy_u16(pkt
, s
->psksession_id
,
1139 s
->psksession_id_len
)
1140 || !WPACKET_put_bytes_u32(pkt
, 0)) {
1141 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_PSK
,
1142 ERR_R_INTERNAL_ERROR
);
1143 return EXT_RETURN_FAIL
;
1147 if (!WPACKET_close(pkt
)
1148 || !WPACKET_get_total_written(pkt
, &binderoffset
)
1149 || !WPACKET_start_sub_packet_u16(pkt
)
1151 && !WPACKET_sub_allocate_bytes_u8(pkt
, reshashsize
, &resbinder
))
1152 || (s
->psksession
!= NULL
1153 && !WPACKET_sub_allocate_bytes_u8(pkt
, pskhashsize
, &pskbinder
))
1154 || !WPACKET_close(pkt
)
1155 || !WPACKET_close(pkt
)
1156 || !WPACKET_get_total_written(pkt
, &msglen
)
1158 * We need to fill in all the sub-packet lengths now so we can
1159 * calculate the HMAC of the message up to the binders
1161 || !WPACKET_fill_lengths(pkt
)) {
1162 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_CONSTRUCT_CTOS_PSK
,
1163 ERR_R_INTERNAL_ERROR
);
1164 return EXT_RETURN_FAIL
;
1167 msgstart
= WPACKET_get_curr(pkt
) - msglen
;
1170 && tls_psk_do_binder(s
, mdres
, msgstart
, binderoffset
, NULL
,
1171 resbinder
, s
->session
, 1, 0) != 1) {
1172 /* SSLfatal() already called */
1173 return EXT_RETURN_FAIL
;
1176 if (s
->psksession
!= NULL
1177 && tls_psk_do_binder(s
, mdpsk
, msgstart
, binderoffset
, NULL
,
1178 pskbinder
, s
->psksession
, 1, 1) != 1) {
1179 /* SSLfatal() already called */
1180 return EXT_RETURN_FAIL
;
1184 s
->session
->ext
.tick_identity
= 0;
1185 if (s
->psksession
!= NULL
)
1186 s
->psksession
->ext
.tick_identity
= (dores
? 1 : 0);
1188 return EXT_RETURN_SENT
;
1190 return EXT_RETURN_NOT_SENT
;
1194 EXT_RETURN
tls_construct_ctos_post_handshake_auth(SSL
*s
, WPACKET
*pkt
,
1195 unsigned int context
,
1196 X509
*x
, size_t chainidx
)
1198 #ifndef OPENSSL_NO_TLS1_3
1199 if (!s
->pha_enabled
)
1200 return EXT_RETURN_NOT_SENT
;
1202 /* construct extension - 0 length, no contents */
1203 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_post_handshake_auth
)
1204 || !WPACKET_start_sub_packet_u16(pkt
)
1205 || !WPACKET_close(pkt
)) {
1206 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
1207 SSL_F_TLS_CONSTRUCT_CTOS_POST_HANDSHAKE_AUTH
,
1208 ERR_R_INTERNAL_ERROR
);
1209 return EXT_RETURN_FAIL
;
1212 s
->post_handshake_auth
= SSL_PHA_EXT_SENT
;
1214 return EXT_RETURN_SENT
;
1216 return EXT_RETURN_NOT_SENT
;
1222 * Parse the server's renegotiation binding and abort if it's not right
1224 int tls_parse_stoc_renegotiate(SSL
*s
, PACKET
*pkt
, unsigned int context
,
1225 X509
*x
, size_t chainidx
)
1227 size_t expected_len
= s
->s3
->previous_client_finished_len
1228 + s
->s3
->previous_server_finished_len
;
1230 const unsigned char *data
;
1232 /* Check for logic errors */
1233 if (!ossl_assert(expected_len
== 0
1234 || s
->s3
->previous_client_finished_len
!= 0)
1235 || !ossl_assert(expected_len
== 0
1236 || s
->s3
->previous_server_finished_len
!= 0)) {
1237 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_PARSE_STOC_RENEGOTIATE
,
1238 ERR_R_INTERNAL_ERROR
);
1242 /* Parse the length byte */
1243 if (!PACKET_get_1_len(pkt
, &ilen
)) {
1244 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_TLS_PARSE_STOC_RENEGOTIATE
,
1245 SSL_R_RENEGOTIATION_ENCODING_ERR
);
1249 /* Consistency check */
1250 if (PACKET_remaining(pkt
) != ilen
) {
1251 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_TLS_PARSE_STOC_RENEGOTIATE
,
1252 SSL_R_RENEGOTIATION_ENCODING_ERR
);
1256 /* Check that the extension matches */
1257 if (ilen
!= expected_len
) {
1258 SSLfatal(s
, SSL_AD_ILLEGAL_PARAMETER
, SSL_F_TLS_PARSE_STOC_RENEGOTIATE
,
1259 SSL_R_RENEGOTIATION_MISMATCH
);
1263 if (!PACKET_get_bytes(pkt
, &data
, s
->s3
->previous_client_finished_len
)
1264 || memcmp(data
, s
->s3
->previous_client_finished
,
1265 s
->s3
->previous_client_finished_len
) != 0) {
1266 SSLfatal(s
, SSL_AD_ILLEGAL_PARAMETER
, SSL_F_TLS_PARSE_STOC_RENEGOTIATE
,
1267 SSL_R_RENEGOTIATION_MISMATCH
);
1271 if (!PACKET_get_bytes(pkt
, &data
, s
->s3
->previous_server_finished_len
)
1272 || memcmp(data
, s
->s3
->previous_server_finished
,
1273 s
->s3
->previous_server_finished_len
) != 0) {
1274 SSLfatal(s
, SSL_AD_ILLEGAL_PARAMETER
, SSL_F_TLS_PARSE_STOC_RENEGOTIATE
,
1275 SSL_R_RENEGOTIATION_MISMATCH
);
1278 s
->s3
->send_connection_binding
= 1;
1283 /* Parse the server's max fragment len extension packet */
1284 int tls_parse_stoc_maxfragmentlen(SSL
*s
, PACKET
*pkt
, unsigned int context
,
1285 X509
*x
, size_t chainidx
)
1289 if (PACKET_remaining(pkt
) != 1 || !PACKET_get_1(pkt
, &value
)) {
1290 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_TLS_PARSE_STOC_MAXFRAGMENTLEN
,
1291 SSL_R_BAD_EXTENSION
);
1295 /* |value| should contains a valid max-fragment-length code. */
1296 if (!IS_MAX_FRAGMENT_LENGTH_EXT_VALID(value
)) {
1297 SSLfatal(s
, SSL_AD_ILLEGAL_PARAMETER
,
1298 SSL_F_TLS_PARSE_STOC_MAXFRAGMENTLEN
,
1299 SSL_R_SSL3_EXT_INVALID_MAX_FRAGMENT_LENGTH
);
1303 /* Must be the same value as client-configured one who was sent to server */
1305 * RFC 6066: if a client receives a maximum fragment length negotiation
1306 * response that differs from the length it requested, ...
1307 * It must abort with SSL_AD_ILLEGAL_PARAMETER alert
1309 if (value
!= s
->ext
.max_fragment_len_mode
) {
1310 SSLfatal(s
, SSL_AD_ILLEGAL_PARAMETER
,
1311 SSL_F_TLS_PARSE_STOC_MAXFRAGMENTLEN
,
1312 SSL_R_SSL3_EXT_INVALID_MAX_FRAGMENT_LENGTH
);
1317 * Maximum Fragment Length Negotiation succeeded.
1318 * The negotiated Maximum Fragment Length is binding now.
1320 s
->session
->ext
.max_fragment_len_mode
= value
;
1325 int tls_parse_stoc_server_name(SSL
*s
, PACKET
*pkt
, unsigned int context
,
1326 X509
*x
, size_t chainidx
)
1328 if (s
->ext
.hostname
== NULL
) {
1329 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_PARSE_STOC_SERVER_NAME
,
1330 ERR_R_INTERNAL_ERROR
);
1334 if (PACKET_remaining(pkt
) > 0) {
1335 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_TLS_PARSE_STOC_SERVER_NAME
,
1336 SSL_R_BAD_EXTENSION
);
1341 if (s
->session
->ext
.hostname
!= NULL
) {
1342 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_PARSE_STOC_SERVER_NAME
,
1343 ERR_R_INTERNAL_ERROR
);
1346 s
->session
->ext
.hostname
= OPENSSL_strdup(s
->ext
.hostname
);
1347 if (s
->session
->ext
.hostname
== NULL
) {
1348 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_PARSE_STOC_SERVER_NAME
,
1349 ERR_R_INTERNAL_ERROR
);
1357 #ifndef OPENSSL_NO_EC
1358 int tls_parse_stoc_ec_pt_formats(SSL
*s
, PACKET
*pkt
, unsigned int context
,
1359 X509
*x
, size_t chainidx
)
1361 size_t ecpointformats_len
;
1362 PACKET ecptformatlist
;
1364 if (!PACKET_as_length_prefixed_1(pkt
, &ecptformatlist
)) {
1365 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_TLS_PARSE_STOC_EC_PT_FORMATS
,
1366 SSL_R_BAD_EXTENSION
);
1370 ecpointformats_len
= PACKET_remaining(&ecptformatlist
);
1371 if (ecpointformats_len
== 0) {
1372 SSLfatal(s
, SSL_AD_DECODE_ERROR
,
1373 SSL_F_TLS_PARSE_STOC_EC_PT_FORMATS
, SSL_R_BAD_LENGTH
);
1377 s
->session
->ext
.ecpointformats_len
= 0;
1378 OPENSSL_free(s
->session
->ext
.ecpointformats
);
1379 s
->session
->ext
.ecpointformats
= OPENSSL_malloc(ecpointformats_len
);
1380 if (s
->session
->ext
.ecpointformats
== NULL
) {
1381 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
1382 SSL_F_TLS_PARSE_STOC_EC_PT_FORMATS
, ERR_R_INTERNAL_ERROR
);
1386 s
->session
->ext
.ecpointformats_len
= ecpointformats_len
;
1388 if (!PACKET_copy_bytes(&ecptformatlist
,
1389 s
->session
->ext
.ecpointformats
,
1390 ecpointformats_len
)) {
1391 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
1392 SSL_F_TLS_PARSE_STOC_EC_PT_FORMATS
, ERR_R_INTERNAL_ERROR
);
1401 int tls_parse_stoc_session_ticket(SSL
*s
, PACKET
*pkt
, unsigned int context
,
1402 X509
*x
, size_t chainidx
)
1404 if (s
->ext
.session_ticket_cb
!= NULL
&&
1405 !s
->ext
.session_ticket_cb(s
, PACKET_data(pkt
),
1406 PACKET_remaining(pkt
),
1407 s
->ext
.session_ticket_cb_arg
)) {
1408 SSLfatal(s
, SSL_AD_HANDSHAKE_FAILURE
,
1409 SSL_F_TLS_PARSE_STOC_SESSION_TICKET
, SSL_R_BAD_EXTENSION
);
1413 if (!tls_use_ticket(s
)) {
1414 SSLfatal(s
, SSL_AD_UNSUPPORTED_EXTENSION
,
1415 SSL_F_TLS_PARSE_STOC_SESSION_TICKET
, SSL_R_BAD_EXTENSION
);
1418 if (PACKET_remaining(pkt
) > 0) {
1419 SSLfatal(s
, SSL_AD_DECODE_ERROR
,
1420 SSL_F_TLS_PARSE_STOC_SESSION_TICKET
, SSL_R_BAD_EXTENSION
);
1424 s
->ext
.ticket_expected
= 1;
1429 #ifndef OPENSSL_NO_OCSP
1430 int tls_parse_stoc_status_request(SSL
*s
, PACKET
*pkt
, unsigned int context
,
1431 X509
*x
, size_t chainidx
)
1433 if (context
== SSL_EXT_TLS1_3_CERTIFICATE_REQUEST
) {
1434 /* We ignore this if the server sends a CertificateRequest */
1435 /* TODO(TLS1.3): Add support for this */
1440 * MUST only be sent if we've requested a status
1441 * request message. In TLS <= 1.2 it must also be empty.
1443 if (s
->ext
.status_type
!= TLSEXT_STATUSTYPE_ocsp
) {
1444 SSLfatal(s
, SSL_AD_UNSUPPORTED_EXTENSION
,
1445 SSL_F_TLS_PARSE_STOC_STATUS_REQUEST
, SSL_R_BAD_EXTENSION
);
1448 if (!SSL_IS_TLS13(s
) && PACKET_remaining(pkt
) > 0) {
1449 SSLfatal(s
, SSL_AD_DECODE_ERROR
,
1450 SSL_F_TLS_PARSE_STOC_STATUS_REQUEST
, SSL_R_BAD_EXTENSION
);
1454 if (SSL_IS_TLS13(s
)) {
1455 /* We only know how to handle this if it's for the first Certificate in
1456 * the chain. We ignore any other responses.
1461 /* SSLfatal() already called */
1462 return tls_process_cert_status_body(s
, pkt
);
1465 /* Set flag to expect CertificateStatus message */
1466 s
->ext
.status_expected
= 1;
1473 #ifndef OPENSSL_NO_CT
1474 int tls_parse_stoc_sct(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1477 if (context
== SSL_EXT_TLS1_3_CERTIFICATE_REQUEST
) {
1478 /* We ignore this if the server sends it in a CertificateRequest */
1479 /* TODO(TLS1.3): Add support for this */
1484 * Only take it if we asked for it - i.e if there is no CT validation
1485 * callback set, then a custom extension MAY be processing it, so we
1486 * need to let control continue to flow to that.
1488 if (s
->ct_validation_callback
!= NULL
) {
1489 size_t size
= PACKET_remaining(pkt
);
1491 /* Simply copy it off for later processing */
1492 OPENSSL_free(s
->ext
.scts
);
1495 s
->ext
.scts_len
= (uint16_t)size
;
1497 s
->ext
.scts
= OPENSSL_malloc(size
);
1498 if (s
->ext
.scts
== NULL
1499 || !PACKET_copy_bytes(pkt
, s
->ext
.scts
, size
)) {
1500 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_PARSE_STOC_SCT
,
1501 ERR_R_INTERNAL_ERROR
);
1506 ENDPOINT role
= (context
& SSL_EXT_TLS1_2_SERVER_HELLO
) != 0
1507 ? ENDPOINT_CLIENT
: ENDPOINT_BOTH
;
1510 * If we didn't ask for it then there must be a custom extension,
1511 * otherwise this is unsolicited.
1513 if (custom_ext_find(&s
->cert
->custext
, role
,
1514 TLSEXT_TYPE_signed_certificate_timestamp
,
1516 SSLfatal(s
, TLS1_AD_UNSUPPORTED_EXTENSION
, SSL_F_TLS_PARSE_STOC_SCT
,
1517 SSL_R_BAD_EXTENSION
);
1521 if (!custom_ext_parse(s
, context
,
1522 TLSEXT_TYPE_signed_certificate_timestamp
,
1523 PACKET_data(pkt
), PACKET_remaining(pkt
),
1525 /* SSLfatal already called */
1535 #ifndef OPENSSL_NO_NEXTPROTONEG
1537 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1538 * elements of zero length are allowed and the set of elements must exactly
1539 * fill the length of the block. Returns 1 on success or 0 on failure.
1541 static int ssl_next_proto_validate(SSL
*s
, PACKET
*pkt
)
1543 PACKET tmp_protocol
;
1545 while (PACKET_remaining(pkt
)) {
1546 if (!PACKET_get_length_prefixed_1(pkt
, &tmp_protocol
)
1547 || PACKET_remaining(&tmp_protocol
) == 0) {
1548 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_SSL_NEXT_PROTO_VALIDATE
,
1549 SSL_R_BAD_EXTENSION
);
1557 int tls_parse_stoc_npn(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1560 unsigned char *selected
;
1561 unsigned char selected_len
;
1564 /* Check if we are in a renegotiation. If so ignore this extension */
1565 if (!SSL_IS_FIRST_HANDSHAKE(s
))
1568 /* We must have requested it. */
1569 if (s
->ctx
->ext
.npn_select_cb
== NULL
) {
1570 SSLfatal(s
, SSL_AD_UNSUPPORTED_EXTENSION
, SSL_F_TLS_PARSE_STOC_NPN
,
1571 SSL_R_BAD_EXTENSION
);
1575 /* The data must be valid */
1577 if (!ssl_next_proto_validate(s
, &tmppkt
)) {
1578 /* SSLfatal() already called */
1581 if (s
->ctx
->ext
.npn_select_cb(s
, &selected
, &selected_len
,
1583 PACKET_remaining(pkt
),
1584 s
->ctx
->ext
.npn_select_cb_arg
) !=
1585 SSL_TLSEXT_ERR_OK
) {
1586 SSLfatal(s
, SSL_AD_HANDSHAKE_FAILURE
, SSL_F_TLS_PARSE_STOC_NPN
,
1587 SSL_R_BAD_EXTENSION
);
1592 * Could be non-NULL if server has sent multiple NPN extensions in
1593 * a single Serverhello
1595 OPENSSL_free(s
->ext
.npn
);
1596 s
->ext
.npn
= OPENSSL_malloc(selected_len
);
1597 if (s
->ext
.npn
== NULL
) {
1598 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_PARSE_STOC_NPN
,
1599 ERR_R_INTERNAL_ERROR
);
1603 memcpy(s
->ext
.npn
, selected
, selected_len
);
1604 s
->ext
.npn_len
= selected_len
;
1605 s
->s3
->npn_seen
= 1;
1611 int tls_parse_stoc_alpn(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1616 /* We must have requested it. */
1617 if (!s
->s3
->alpn_sent
) {
1618 SSLfatal(s
, SSL_AD_UNSUPPORTED_EXTENSION
, SSL_F_TLS_PARSE_STOC_ALPN
,
1619 SSL_R_BAD_EXTENSION
);
1623 * The extension data consists of:
1624 * uint16 list_length
1625 * uint8 proto_length;
1626 * uint8 proto[proto_length];
1628 if (!PACKET_get_net_2_len(pkt
, &len
)
1629 || PACKET_remaining(pkt
) != len
|| !PACKET_get_1_len(pkt
, &len
)
1630 || PACKET_remaining(pkt
) != len
) {
1631 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_TLS_PARSE_STOC_ALPN
,
1632 SSL_R_BAD_EXTENSION
);
1635 OPENSSL_free(s
->s3
->alpn_selected
);
1636 s
->s3
->alpn_selected
= OPENSSL_malloc(len
);
1637 if (s
->s3
->alpn_selected
== NULL
) {
1638 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_PARSE_STOC_ALPN
,
1639 ERR_R_INTERNAL_ERROR
);
1642 if (!PACKET_copy_bytes(pkt
, s
->s3
->alpn_selected
, len
)) {
1643 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_TLS_PARSE_STOC_ALPN
,
1644 SSL_R_BAD_EXTENSION
);
1647 s
->s3
->alpn_selected_len
= len
;
1649 if (s
->session
->ext
.alpn_selected
== NULL
1650 || s
->session
->ext
.alpn_selected_len
!= len
1651 || memcmp(s
->session
->ext
.alpn_selected
, s
->s3
->alpn_selected
, len
)
1653 /* ALPN not consistent with the old session so cannot use early_data */
1654 s
->ext
.early_data_ok
= 0;
1658 * This is a new session and so alpn_selected should have been
1659 * initialised to NULL. We should update it with the selected ALPN.
1661 if (!ossl_assert(s
->session
->ext
.alpn_selected
== NULL
)) {
1662 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_PARSE_STOC_ALPN
,
1663 ERR_R_INTERNAL_ERROR
);
1666 s
->session
->ext
.alpn_selected
=
1667 OPENSSL_memdup(s
->s3
->alpn_selected
, s
->s3
->alpn_selected_len
);
1668 if (s
->session
->ext
.alpn_selected
== NULL
) {
1669 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_PARSE_STOC_ALPN
,
1670 ERR_R_INTERNAL_ERROR
);
1673 s
->session
->ext
.alpn_selected_len
= s
->s3
->alpn_selected_len
;
1679 #ifndef OPENSSL_NO_SRTP
1680 int tls_parse_stoc_use_srtp(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1683 unsigned int id
, ct
, mki
;
1685 STACK_OF(SRTP_PROTECTION_PROFILE
) *clnt
;
1686 SRTP_PROTECTION_PROFILE
*prof
;
1688 if (!PACKET_get_net_2(pkt
, &ct
) || ct
!= 2
1689 || !PACKET_get_net_2(pkt
, &id
)
1690 || !PACKET_get_1(pkt
, &mki
)
1691 || PACKET_remaining(pkt
) != 0) {
1692 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_TLS_PARSE_STOC_USE_SRTP
,
1693 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST
);
1698 /* Must be no MKI, since we never offer one */
1699 SSLfatal(s
, SSL_AD_ILLEGAL_PARAMETER
, SSL_F_TLS_PARSE_STOC_USE_SRTP
,
1700 SSL_R_BAD_SRTP_MKI_VALUE
);
1704 /* Throw an error if the server gave us an unsolicited extension */
1705 clnt
= SSL_get_srtp_profiles(s
);
1707 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_TLS_PARSE_STOC_USE_SRTP
,
1708 SSL_R_NO_SRTP_PROFILES
);
1713 * Check to see if the server gave us something we support (and
1714 * presumably offered)
1716 for (i
= 0; i
< sk_SRTP_PROTECTION_PROFILE_num(clnt
); i
++) {
1717 prof
= sk_SRTP_PROTECTION_PROFILE_value(clnt
, i
);
1719 if (prof
->id
== id
) {
1720 s
->srtp_profile
= prof
;
1725 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_TLS_PARSE_STOC_USE_SRTP
,
1726 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST
);
1731 int tls_parse_stoc_etm(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1734 /* Ignore if inappropriate ciphersuite */
1735 if (!(s
->options
& SSL_OP_NO_ENCRYPT_THEN_MAC
)
1736 && s
->s3
->tmp
.new_cipher
->algorithm_mac
!= SSL_AEAD
1737 && s
->s3
->tmp
.new_cipher
->algorithm_enc
!= SSL_RC4
)
1743 int tls_parse_stoc_ems(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1746 s
->s3
->flags
|= TLS1_FLAGS_RECEIVED_EXTMS
;
1748 s
->session
->flags
|= SSL_SESS_FLAG_EXTMS
;
1753 int tls_parse_stoc_supported_versions(SSL
*s
, PACKET
*pkt
, unsigned int context
,
1754 X509
*x
, size_t chainidx
)
1756 unsigned int version
;
1758 if (!PACKET_get_net_2(pkt
, &version
)
1759 || PACKET_remaining(pkt
) != 0) {
1760 SSLfatal(s
, SSL_AD_DECODE_ERROR
,
1761 SSL_F_TLS_PARSE_STOC_SUPPORTED_VERSIONS
,
1762 SSL_R_LENGTH_MISMATCH
);
1767 * The only protocol version we support which is valid in this extension in
1768 * a ServerHello is TLSv1.3 therefore we shouldn't be getting anything else.
1770 if (version
!= TLS1_3_VERSION
) {
1771 SSLfatal(s
, SSL_AD_ILLEGAL_PARAMETER
,
1772 SSL_F_TLS_PARSE_STOC_SUPPORTED_VERSIONS
,
1773 SSL_R_BAD_PROTOCOL_VERSION_NUMBER
);
1777 /* We ignore this extension for HRRs except to sanity check it */
1778 if (context
== SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST
)
1781 /* We just set it here. We validate it in ssl_choose_client_version */
1782 s
->version
= version
;
1787 int tls_parse_stoc_key_share(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1790 #ifndef OPENSSL_NO_TLS1_3
1791 unsigned int group_id
;
1793 EVP_PKEY
*ckey
= s
->s3
->tmp
.pkey
, *skey
= NULL
;
1796 if (ckey
== NULL
|| s
->s3
->peer_tmp
!= NULL
) {
1797 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_PARSE_STOC_KEY_SHARE
,
1798 ERR_R_INTERNAL_ERROR
);
1802 if (!PACKET_get_net_2(pkt
, &group_id
)) {
1803 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_TLS_PARSE_STOC_KEY_SHARE
,
1804 SSL_R_LENGTH_MISMATCH
);
1808 if ((context
& SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST
) != 0) {
1809 const uint16_t *pgroups
= NULL
;
1810 size_t i
, num_groups
;
1812 if (PACKET_remaining(pkt
) != 0) {
1813 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_TLS_PARSE_STOC_KEY_SHARE
,
1814 SSL_R_LENGTH_MISMATCH
);
1819 * It is an error if the HelloRetryRequest wants a key_share that we
1820 * already sent in the first ClientHello
1822 if (group_id
== s
->s3
->group_id
) {
1823 SSLfatal(s
, SSL_AD_ILLEGAL_PARAMETER
,
1824 SSL_F_TLS_PARSE_STOC_KEY_SHARE
, SSL_R_BAD_KEY_SHARE
);
1828 /* Validate the selected group is one we support */
1829 tls1_get_supported_groups(s
, &pgroups
, &num_groups
);
1830 for (i
= 0; i
< num_groups
; i
++) {
1831 if (group_id
== pgroups
[i
])
1835 || !tls_curve_allowed(s
, group_id
, SSL_SECOP_CURVE_SUPPORTED
)) {
1836 SSLfatal(s
, SSL_AD_ILLEGAL_PARAMETER
,
1837 SSL_F_TLS_PARSE_STOC_KEY_SHARE
, SSL_R_BAD_KEY_SHARE
);
1841 s
->s3
->group_id
= group_id
;
1842 EVP_PKEY_free(s
->s3
->tmp
.pkey
);
1843 s
->s3
->tmp
.pkey
= NULL
;
1847 if (group_id
!= s
->s3
->group_id
) {
1849 * This isn't for the group that we sent in the original
1852 SSLfatal(s
, SSL_AD_ILLEGAL_PARAMETER
, SSL_F_TLS_PARSE_STOC_KEY_SHARE
,
1853 SSL_R_BAD_KEY_SHARE
);
1857 if (!PACKET_as_length_prefixed_2(pkt
, &encoded_pt
)
1858 || PACKET_remaining(&encoded_pt
) == 0) {
1859 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_TLS_PARSE_STOC_KEY_SHARE
,
1860 SSL_R_LENGTH_MISMATCH
);
1864 skey
= ssl_generate_pkey(ckey
);
1866 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_F_TLS_PARSE_STOC_KEY_SHARE
,
1867 ERR_R_MALLOC_FAILURE
);
1870 if (!EVP_PKEY_set1_tls_encodedpoint(skey
, PACKET_data(&encoded_pt
),
1871 PACKET_remaining(&encoded_pt
))) {
1872 SSLfatal(s
, SSL_AD_ILLEGAL_PARAMETER
, SSL_F_TLS_PARSE_STOC_KEY_SHARE
,
1874 EVP_PKEY_free(skey
);
1878 if (ssl_derive(s
, ckey
, skey
, 1) == 0) {
1879 /* SSLfatal() already called */
1880 EVP_PKEY_free(skey
);
1883 s
->s3
->peer_tmp
= skey
;
1889 int tls_parse_stoc_cookie(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1894 if (!PACKET_as_length_prefixed_2(pkt
, &cookie
)
1895 || !PACKET_memdup(&cookie
, &s
->ext
.tls13_cookie
,
1896 &s
->ext
.tls13_cookie_len
)) {
1897 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_TLS_PARSE_STOC_COOKIE
,
1898 SSL_R_LENGTH_MISMATCH
);
1905 int tls_parse_stoc_early_data(SSL
*s
, PACKET
*pkt
, unsigned int context
,
1906 X509
*x
, size_t chainidx
)
1908 if (context
== SSL_EXT_TLS1_3_NEW_SESSION_TICKET
) {
1909 unsigned long max_early_data
;
1911 if (!PACKET_get_net_4(pkt
, &max_early_data
)
1912 || PACKET_remaining(pkt
) != 0) {
1913 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_TLS_PARSE_STOC_EARLY_DATA
,
1914 SSL_R_INVALID_MAX_EARLY_DATA
);
1918 s
->session
->ext
.max_early_data
= max_early_data
;
1923 if (PACKET_remaining(pkt
) != 0) {
1924 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_TLS_PARSE_STOC_EARLY_DATA
,
1925 SSL_R_BAD_EXTENSION
);
1929 if (!s
->ext
.early_data_ok
1931 || s
->session
->ext
.tick_identity
!= 0) {
1933 * If we get here then we didn't send early data, or we didn't resume
1934 * using the first identity, or the SNI/ALPN is not consistent so the
1935 * server should not be accepting it.
1937 SSLfatal(s
, SSL_AD_ILLEGAL_PARAMETER
, SSL_F_TLS_PARSE_STOC_EARLY_DATA
,
1938 SSL_R_BAD_EXTENSION
);
1942 s
->ext
.early_data
= SSL_EARLY_DATA_ACCEPTED
;
1947 int tls_parse_stoc_psk(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1950 #ifndef OPENSSL_NO_TLS1_3
1951 unsigned int identity
;
1953 if (!PACKET_get_net_2(pkt
, &identity
) || PACKET_remaining(pkt
) != 0) {
1954 SSLfatal(s
, SSL_AD_DECODE_ERROR
, SSL_F_TLS_PARSE_STOC_PSK
,
1955 SSL_R_LENGTH_MISMATCH
);
1959 if (s
->session
->ext
.tick_identity
== (int)identity
) {
1961 SSL_SESSION_free(s
->psksession
);
1962 s
->psksession
= NULL
;
1966 if (s
->psksession
== NULL
1967 || s
->psksession
->ext
.tick_identity
!= (int)identity
) {
1968 SSLfatal(s
, SSL_AD_ILLEGAL_PARAMETER
, SSL_F_TLS_PARSE_STOC_PSK
,
1969 SSL_R_BAD_PSK_IDENTITY
);
1974 * If we used the external PSK for sending early_data then s->early_secret
1975 * is already set up, so don't overwrite it. Otherwise we copy the
1976 * early_secret across that we generated earlier.
1978 if ((s
->early_data_state
!= SSL_EARLY_DATA_WRITE_RETRY
1979 && s
->early_data_state
!= SSL_EARLY_DATA_FINISHED_WRITING
)
1980 || s
->session
->ext
.max_early_data
> 0
1981 || s
->psksession
->ext
.max_early_data
== 0)
1982 memcpy(s
->early_secret
, s
->psksession
->early_secret
, EVP_MAX_MD_SIZE
);
1984 SSL_SESSION_free(s
->session
);
1985 s
->session
= s
->psksession
;
1986 s
->psksession
= NULL
;