2 * Copyright 2016-2017 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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 "statem_locl.h"
14 EXT_RETURN
tls_construct_ctos_renegotiate(SSL
*s
, WPACKET
*pkt
,
15 unsigned int context
, X509
*x
,
16 size_t chainidx
, int *al
)
18 /* Add RI if renegotiating */
20 return EXT_RETURN_NOT_SENT
;
22 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_renegotiate
)
23 || !WPACKET_start_sub_packet_u16(pkt
)
24 || !WPACKET_sub_memcpy_u8(pkt
, s
->s3
->previous_client_finished
,
25 s
->s3
->previous_client_finished_len
)
26 || !WPACKET_close(pkt
)) {
27 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_RENEGOTIATE
, ERR_R_INTERNAL_ERROR
);
28 return EXT_RETURN_FAIL
;
31 return EXT_RETURN_SENT
;
34 EXT_RETURN
tls_construct_ctos_server_name(SSL
*s
, WPACKET
*pkt
,
35 unsigned int context
, X509
*x
,
36 size_t chainidx
, int *al
)
38 if (s
->ext
.hostname
== NULL
)
39 return EXT_RETURN_NOT_SENT
;
41 /* Add TLS extension servername to the Client Hello message */
42 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_server_name
)
43 /* Sub-packet for server_name extension */
44 || !WPACKET_start_sub_packet_u16(pkt
)
45 /* Sub-packet for servername list (always 1 hostname)*/
46 || !WPACKET_start_sub_packet_u16(pkt
)
47 || !WPACKET_put_bytes_u8(pkt
, TLSEXT_NAMETYPE_host_name
)
48 || !WPACKET_sub_memcpy_u16(pkt
, s
->ext
.hostname
,
49 strlen(s
->ext
.hostname
))
50 || !WPACKET_close(pkt
)
51 || !WPACKET_close(pkt
)) {
52 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SERVER_NAME
, ERR_R_INTERNAL_ERROR
);
53 return EXT_RETURN_FAIL
;
56 return EXT_RETURN_SENT
;
59 #ifndef OPENSSL_NO_SRP
60 EXT_RETURN
tls_construct_ctos_srp(SSL
*s
, WPACKET
*pkt
, unsigned int context
,
61 X509
*x
, size_t chainidx
, int *al
)
63 /* Add SRP username if there is one */
64 if (s
->srp_ctx
.login
== NULL
)
65 return EXT_RETURN_NOT_SENT
;
67 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_srp
)
68 /* Sub-packet for SRP extension */
69 || !WPACKET_start_sub_packet_u16(pkt
)
70 || !WPACKET_start_sub_packet_u8(pkt
)
71 /* login must not be zero...internal error if so */
72 || !WPACKET_set_flags(pkt
, WPACKET_FLAGS_NON_ZERO_LENGTH
)
73 || !WPACKET_memcpy(pkt
, s
->srp_ctx
.login
,
74 strlen(s
->srp_ctx
.login
))
75 || !WPACKET_close(pkt
)
76 || !WPACKET_close(pkt
)) {
77 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SRP
, ERR_R_INTERNAL_ERROR
);
78 return EXT_RETURN_FAIL
;
81 return EXT_RETURN_SENT
;
86 static int use_ecc(SSL
*s
)
89 unsigned long alg_k
, alg_a
;
90 STACK_OF(SSL_CIPHER
) *cipher_stack
= NULL
;
92 /* See if we support any ECC ciphersuites */
93 if (s
->version
== SSL3_VERSION
)
96 cipher_stack
= SSL_get_ciphers(s
);
97 end
= sk_SSL_CIPHER_num(cipher_stack
);
98 for (i
= 0; i
< end
; i
++) {
99 const SSL_CIPHER
*c
= sk_SSL_CIPHER_value(cipher_stack
, i
);
101 alg_k
= c
->algorithm_mkey
;
102 alg_a
= c
->algorithm_auth
;
103 if ((alg_k
& (SSL_kECDHE
| SSL_kECDHEPSK
))
104 || (alg_a
& SSL_aECDSA
)
105 || c
->min_tls
>= TLS1_3_VERSION
)
112 EXT_RETURN
tls_construct_ctos_ec_pt_formats(SSL
*s
, WPACKET
*pkt
,
113 unsigned int context
, X509
*x
,
114 size_t chainidx
, int *al
)
116 const unsigned char *pformats
;
120 return EXT_RETURN_NOT_SENT
;
122 /* Add TLS extension ECPointFormats to the ClientHello message */
123 tls1_get_formatlist(s
, &pformats
, &num_formats
);
125 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_ec_point_formats
)
126 /* Sub-packet for formats extension */
127 || !WPACKET_start_sub_packet_u16(pkt
)
128 || !WPACKET_sub_memcpy_u8(pkt
, pformats
, num_formats
)
129 || !WPACKET_close(pkt
)) {
130 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EC_PT_FORMATS
, ERR_R_INTERNAL_ERROR
);
131 return EXT_RETURN_FAIL
;
134 return EXT_RETURN_SENT
;
137 EXT_RETURN
tls_construct_ctos_supported_groups(SSL
*s
, WPACKET
*pkt
,
138 unsigned int context
, X509
*x
,
139 size_t chainidx
, int *al
)
141 const unsigned char *pcurves
= NULL
, *pcurvestmp
;
142 size_t num_curves
= 0, i
;
145 return EXT_RETURN_NOT_SENT
;
148 * Add TLS extension supported_groups to the ClientHello message
150 /* TODO(TLS1.3): Add support for DHE groups */
151 if (!tls1_get_curvelist(s
, 0, &pcurves
, &num_curves
)) {
152 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS
,
153 ERR_R_INTERNAL_ERROR
);
154 return EXT_RETURN_FAIL
;
156 pcurvestmp
= pcurves
;
158 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_supported_groups
)
159 /* Sub-packet for supported_groups extension */
160 || !WPACKET_start_sub_packet_u16(pkt
)
161 || !WPACKET_start_sub_packet_u16(pkt
)) {
162 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS
,
163 ERR_R_INTERNAL_ERROR
);
164 return EXT_RETURN_FAIL
;
166 /* Copy curve ID if supported */
167 for (i
= 0; i
< num_curves
; i
++, pcurvestmp
+= 2) {
168 if (tls_curve_allowed(s
, pcurvestmp
, SSL_SECOP_CURVE_SUPPORTED
)) {
169 if (!WPACKET_put_bytes_u8(pkt
, pcurvestmp
[0])
170 || !WPACKET_put_bytes_u8(pkt
, pcurvestmp
[1])) {
171 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS
,
172 ERR_R_INTERNAL_ERROR
);
173 return EXT_RETURN_FAIL
;
177 if (!WPACKET_close(pkt
) || !WPACKET_close(pkt
)) {
178 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS
,
179 ERR_R_INTERNAL_ERROR
);
180 return EXT_RETURN_FAIL
;
183 return EXT_RETURN_SENT
;
187 EXT_RETURN
tls_construct_ctos_session_ticket(SSL
*s
, WPACKET
*pkt
,
188 unsigned int context
, X509
*x
,
189 size_t chainidx
, int *al
)
193 if (!tls_use_ticket(s
))
194 return EXT_RETURN_NOT_SENT
;
196 if (!s
->new_session
&& s
->session
!= NULL
197 && s
->session
->ext
.tick
!= NULL
198 && s
->session
->ssl_version
!= TLS1_3_VERSION
) {
199 ticklen
= s
->session
->ext
.ticklen
;
200 } else if (s
->session
&& s
->ext
.session_ticket
!= NULL
201 && s
->ext
.session_ticket
->data
!= NULL
) {
202 ticklen
= s
->ext
.session_ticket
->length
;
203 s
->session
->ext
.tick
= OPENSSL_malloc(ticklen
);
204 if (s
->session
->ext
.tick
== NULL
) {
205 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET
,
206 ERR_R_INTERNAL_ERROR
);
207 return EXT_RETURN_FAIL
;
209 memcpy(s
->session
->ext
.tick
,
210 s
->ext
.session_ticket
->data
, ticklen
);
211 s
->session
->ext
.ticklen
= ticklen
;
216 if (ticklen
== 0 && s
->ext
.session_ticket
!= NULL
&&
217 s
->ext
.session_ticket
->data
== NULL
)
218 return EXT_RETURN_NOT_SENT
;
220 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_session_ticket
)
221 || !WPACKET_sub_memcpy_u16(pkt
, s
->session
->ext
.tick
, ticklen
)) {
222 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET
, ERR_R_INTERNAL_ERROR
);
223 return EXT_RETURN_FAIL
;
226 return EXT_RETURN_SENT
;
229 EXT_RETURN
tls_construct_ctos_sig_algs(SSL
*s
, WPACKET
*pkt
,
230 unsigned int context
, X509
*x
,
231 size_t chainidx
, int *al
)
234 const uint16_t *salg
;
236 if (!SSL_CLIENT_USE_SIGALGS(s
))
237 return EXT_RETURN_NOT_SENT
;
239 salglen
= tls12_get_psigalgs(s
, 1, &salg
);
240 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_signature_algorithms
)
241 /* Sub-packet for sig-algs extension */
242 || !WPACKET_start_sub_packet_u16(pkt
)
243 /* Sub-packet for the actual list */
244 || !WPACKET_start_sub_packet_u16(pkt
)
245 || !tls12_copy_sigalgs(s
, pkt
, salg
, salglen
)
246 || !WPACKET_close(pkt
)
247 || !WPACKET_close(pkt
)) {
248 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SIG_ALGS
, ERR_R_INTERNAL_ERROR
);
249 return EXT_RETURN_FAIL
;
252 return EXT_RETURN_SENT
;
255 #ifndef OPENSSL_NO_OCSP
256 EXT_RETURN
tls_construct_ctos_status_request(SSL
*s
, WPACKET
*pkt
,
257 unsigned int context
, X509
*x
,
258 size_t chainidx
, int *al
)
262 /* This extension isn't defined for client Certificates */
264 return EXT_RETURN_NOT_SENT
;
266 if (s
->ext
.status_type
!= TLSEXT_STATUSTYPE_ocsp
)
267 return EXT_RETURN_NOT_SENT
;
269 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_status_request
)
270 /* Sub-packet for status request extension */
271 || !WPACKET_start_sub_packet_u16(pkt
)
272 || !WPACKET_put_bytes_u8(pkt
, TLSEXT_STATUSTYPE_ocsp
)
273 /* Sub-packet for the ids */
274 || !WPACKET_start_sub_packet_u16(pkt
)) {
275 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
, ERR_R_INTERNAL_ERROR
);
276 return EXT_RETURN_FAIL
;
278 for (i
= 0; i
< sk_OCSP_RESPID_num(s
->ext
.ocsp
.ids
); i
++) {
279 unsigned char *idbytes
;
280 OCSP_RESPID
*id
= sk_OCSP_RESPID_value(s
->ext
.ocsp
.ids
, i
);
281 int idlen
= i2d_OCSP_RESPID(id
, NULL
);
284 /* Sub-packet for an individual id */
285 || !WPACKET_sub_allocate_bytes_u16(pkt
, idlen
, &idbytes
)
286 || i2d_OCSP_RESPID(id
, &idbytes
) != idlen
) {
287 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
,
288 ERR_R_INTERNAL_ERROR
);
289 return EXT_RETURN_FAIL
;
292 if (!WPACKET_close(pkt
)
293 || !WPACKET_start_sub_packet_u16(pkt
)) {
294 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
, ERR_R_INTERNAL_ERROR
);
295 return EXT_RETURN_FAIL
;
297 if (s
->ext
.ocsp
.exts
) {
298 unsigned char *extbytes
;
299 int extlen
= i2d_X509_EXTENSIONS(s
->ext
.ocsp
.exts
, NULL
);
302 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
,
303 ERR_R_INTERNAL_ERROR
);
304 return EXT_RETURN_FAIL
;
306 if (!WPACKET_allocate_bytes(pkt
, extlen
, &extbytes
)
307 || i2d_X509_EXTENSIONS(s
->ext
.ocsp
.exts
, &extbytes
)
309 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
,
310 ERR_R_INTERNAL_ERROR
);
311 return EXT_RETURN_FAIL
;
314 if (!WPACKET_close(pkt
) || !WPACKET_close(pkt
)) {
315 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
, ERR_R_INTERNAL_ERROR
);
316 return EXT_RETURN_FAIL
;
319 return EXT_RETURN_SENT
;
323 #ifndef OPENSSL_NO_NEXTPROTONEG
324 EXT_RETURN
tls_construct_ctos_npn(SSL
*s
, WPACKET
*pkt
, unsigned int context
,
325 X509
*x
, size_t chainidx
, int *al
)
327 if (s
->ctx
->ext
.npn_select_cb
== NULL
|| !SSL_IS_FIRST_HANDSHAKE(s
))
328 return EXT_RETURN_NOT_SENT
;
331 * The client advertises an empty extension to indicate its support
332 * for Next Protocol Negotiation
334 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_next_proto_neg
)
335 || !WPACKET_put_bytes_u16(pkt
, 0)) {
336 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_NPN
, ERR_R_INTERNAL_ERROR
);
337 return EXT_RETURN_FAIL
;
340 return EXT_RETURN_SENT
;
344 EXT_RETURN
tls_construct_ctos_alpn(SSL
*s
, WPACKET
*pkt
, unsigned int context
,
345 X509
*x
, size_t chainidx
, int *al
)
347 s
->s3
->alpn_sent
= 0;
349 if (s
->ext
.alpn
== NULL
|| !SSL_IS_FIRST_HANDSHAKE(s
))
350 return EXT_RETURN_NOT_SENT
;
352 if (!WPACKET_put_bytes_u16(pkt
,
353 TLSEXT_TYPE_application_layer_protocol_negotiation
)
354 /* Sub-packet ALPN extension */
355 || !WPACKET_start_sub_packet_u16(pkt
)
356 || !WPACKET_sub_memcpy_u16(pkt
, s
->ext
.alpn
, s
->ext
.alpn_len
)
357 || !WPACKET_close(pkt
)) {
358 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ALPN
, ERR_R_INTERNAL_ERROR
);
359 return EXT_RETURN_FAIL
;
361 s
->s3
->alpn_sent
= 1;
363 return EXT_RETURN_SENT
;
367 #ifndef OPENSSL_NO_SRTP
368 EXT_RETURN
tls_construct_ctos_use_srtp(SSL
*s
, WPACKET
*pkt
,
369 unsigned int context
, X509
*x
,
370 size_t chainidx
, int *al
)
372 STACK_OF(SRTP_PROTECTION_PROFILE
) *clnt
= SSL_get_srtp_profiles(s
);
376 return EXT_RETURN_NOT_SENT
;
378 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_use_srtp
)
379 /* Sub-packet for SRTP extension */
380 || !WPACKET_start_sub_packet_u16(pkt
)
381 /* Sub-packet for the protection profile list */
382 || !WPACKET_start_sub_packet_u16(pkt
)) {
383 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP
, ERR_R_INTERNAL_ERROR
);
384 return EXT_RETURN_FAIL
;
387 end
= sk_SRTP_PROTECTION_PROFILE_num(clnt
);
388 for (i
= 0; i
< end
; i
++) {
389 const SRTP_PROTECTION_PROFILE
*prof
=
390 sk_SRTP_PROTECTION_PROFILE_value(clnt
, i
);
392 if (prof
== NULL
|| !WPACKET_put_bytes_u16(pkt
, prof
->id
)) {
393 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP
, ERR_R_INTERNAL_ERROR
);
394 return EXT_RETURN_FAIL
;
397 if (!WPACKET_close(pkt
)
398 /* Add an empty use_mki value */
399 || !WPACKET_put_bytes_u8(pkt
, 0)
400 || !WPACKET_close(pkt
)) {
401 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP
, ERR_R_INTERNAL_ERROR
);
402 return EXT_RETURN_FAIL
;
405 return EXT_RETURN_SENT
;
409 EXT_RETURN
tls_construct_ctos_etm(SSL
*s
, WPACKET
*pkt
, unsigned int context
,
410 X509
*x
, size_t chainidx
, int *al
)
412 if (s
->options
& SSL_OP_NO_ENCRYPT_THEN_MAC
)
413 return EXT_RETURN_NOT_SENT
;
415 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_encrypt_then_mac
)
416 || !WPACKET_put_bytes_u16(pkt
, 0)) {
417 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ETM
, ERR_R_INTERNAL_ERROR
);
418 return EXT_RETURN_FAIL
;
421 return EXT_RETURN_SENT
;
424 #ifndef OPENSSL_NO_CT
425 EXT_RETURN
tls_construct_ctos_sct(SSL
*s
, WPACKET
*pkt
, unsigned int context
,
426 X509
*x
, size_t chainidx
, int *al
)
428 if (s
->ct_validation_callback
== NULL
)
429 return EXT_RETURN_NOT_SENT
;
431 /* Not defined for client Certificates */
433 return EXT_RETURN_NOT_SENT
;
435 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_signed_certificate_timestamp
)
436 || !WPACKET_put_bytes_u16(pkt
, 0)) {
437 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SCT
, ERR_R_INTERNAL_ERROR
);
438 return EXT_RETURN_FAIL
;
441 return EXT_RETURN_SENT
;
445 EXT_RETURN
tls_construct_ctos_ems(SSL
*s
, WPACKET
*pkt
, unsigned int context
,
446 X509
*x
, size_t chainidx
, int *al
)
448 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_extended_master_secret
)
449 || !WPACKET_put_bytes_u16(pkt
, 0)) {
450 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EMS
, ERR_R_INTERNAL_ERROR
);
451 return EXT_RETURN_FAIL
;
454 return EXT_RETURN_SENT
;
457 EXT_RETURN
tls_construct_ctos_supported_versions(SSL
*s
, WPACKET
*pkt
,
458 unsigned int context
, X509
*x
,
459 size_t chainidx
, int *al
)
461 int currv
, min_version
, max_version
, reason
;
463 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_supported_versions
)
464 || !WPACKET_start_sub_packet_u16(pkt
)
465 || !WPACKET_start_sub_packet_u8(pkt
)) {
466 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS
,
467 ERR_R_INTERNAL_ERROR
);
468 return EXT_RETURN_FAIL
;
471 reason
= ssl_get_min_max_version(s
, &min_version
, &max_version
);
473 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS
, reason
);
474 return EXT_RETURN_FAIL
;
478 * TODO(TLS1.3): There is some discussion on the TLS list as to whether
479 * we should include versions <TLS1.2. For the moment we do. To be
482 for (currv
= max_version
; currv
>= min_version
; currv
--) {
483 /* TODO(TLS1.3): Remove this first if clause prior to release!! */
484 if (currv
== TLS1_3_VERSION
) {
485 if (!WPACKET_put_bytes_u16(pkt
, TLS1_3_VERSION_DRAFT
)) {
486 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS
,
487 ERR_R_INTERNAL_ERROR
);
488 return EXT_RETURN_FAIL
;
490 } else if (!WPACKET_put_bytes_u16(pkt
, currv
)) {
491 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS
,
492 ERR_R_INTERNAL_ERROR
);
493 return EXT_RETURN_FAIL
;
496 if (!WPACKET_close(pkt
) || !WPACKET_close(pkt
)) {
497 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS
,
498 ERR_R_INTERNAL_ERROR
);
499 return EXT_RETURN_FAIL
;
502 return EXT_RETURN_SENT
;
506 * Construct a psk_kex_modes extension. We only have two modes we know about
507 * at this stage, so we send both.
509 EXT_RETURN
tls_construct_ctos_psk_kex_modes(SSL
*s
, WPACKET
*pkt
,
510 unsigned int context
, X509
*x
,
511 size_t chainidx
, int *al
)
513 #ifndef OPENSSL_NO_TLS1_3
515 * TODO(TLS1.3): Do we want this list to be configurable? For now we always
516 * just send both supported modes
518 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_psk_kex_modes
)
519 || !WPACKET_start_sub_packet_u16(pkt
)
520 || !WPACKET_start_sub_packet_u8(pkt
)
521 || !WPACKET_put_bytes_u8(pkt
, TLSEXT_KEX_MODE_KE_DHE
)
522 || !WPACKET_put_bytes_u8(pkt
, TLSEXT_KEX_MODE_KE
)
523 || !WPACKET_close(pkt
)
524 || !WPACKET_close(pkt
)) {
525 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK_KEX_MODES
, ERR_R_INTERNAL_ERROR
);
526 return EXT_RETURN_FAIL
;
529 s
->ext
.psk_kex_mode
= TLSEXT_KEX_MODE_FLAG_KE
| TLSEXT_KEX_MODE_FLAG_KE_DHE
;
532 return EXT_RETURN_SENT
;
535 #ifndef OPENSSL_NO_TLS1_3
536 static int add_key_share(SSL
*s
, WPACKET
*pkt
, unsigned int curve_id
)
538 unsigned char *encoded_point
= NULL
;
539 EVP_PKEY
*key_share_key
= NULL
;
542 if (s
->s3
->tmp
.pkey
!= NULL
) {
543 if (!ossl_assert(s
->hello_retry_request
)) {
544 SSLerr(SSL_F_ADD_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
548 * Could happen if we got an HRR that wasn't requesting a new key_share
550 key_share_key
= s
->s3
->tmp
.pkey
;
552 key_share_key
= ssl_generate_pkey_curve(curve_id
);
553 if (key_share_key
== NULL
) {
554 SSLerr(SSL_F_ADD_KEY_SHARE
, ERR_R_EVP_LIB
);
559 /* Encode the public key. */
560 encodedlen
= EVP_PKEY_get1_tls_encodedpoint(key_share_key
,
562 if (encodedlen
== 0) {
563 SSLerr(SSL_F_ADD_KEY_SHARE
, ERR_R_EC_LIB
);
567 /* Create KeyShareEntry */
568 if (!WPACKET_put_bytes_u16(pkt
, curve_id
)
569 || !WPACKET_sub_memcpy_u16(pkt
, encoded_point
, encodedlen
)) {
570 SSLerr(SSL_F_ADD_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
575 * TODO(TLS1.3): When changing to send more than one key_share we're
576 * going to need to be able to save more than one EVP_PKEY. For now
577 * we reuse the existing tmp.pkey
579 s
->s3
->tmp
.pkey
= key_share_key
;
580 s
->s3
->group_id
= curve_id
;
581 OPENSSL_free(encoded_point
);
585 if (s
->s3
->tmp
.pkey
== NULL
)
586 EVP_PKEY_free(key_share_key
);
587 OPENSSL_free(encoded_point
);
592 EXT_RETURN
tls_construct_ctos_key_share(SSL
*s
, WPACKET
*pkt
,
593 unsigned int context
, X509
*x
,
594 size_t chainidx
, int *al
)
596 #ifndef OPENSSL_NO_TLS1_3
597 size_t i
, num_curves
= 0;
598 const unsigned char *pcurves
= NULL
;
599 unsigned int curve_id
= 0;
601 /* key_share extension */
602 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_key_share
)
603 /* Extension data sub-packet */
604 || !WPACKET_start_sub_packet_u16(pkt
)
605 /* KeyShare list sub-packet */
606 || !WPACKET_start_sub_packet_u16(pkt
)) {
607 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
608 return EXT_RETURN_FAIL
;
611 if (!tls1_get_curvelist(s
, 0, &pcurves
, &num_curves
)) {
612 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
613 return EXT_RETURN_FAIL
;
617 * TODO(TLS1.3): Make the number of key_shares sent configurable. For
620 if (s
->s3
->group_id
!= 0) {
621 curve_id
= s
->s3
->group_id
;
623 for (i
= 0; i
< num_curves
; i
++, pcurves
+= 2) {
625 if (!tls_curve_allowed(s
, pcurves
, SSL_SECOP_CURVE_SUPPORTED
))
628 curve_id
= bytestogroup(pcurves
);
634 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE
, SSL_R_NO_SUITABLE_KEY_SHARE
);
635 return EXT_RETURN_FAIL
;
638 if (!add_key_share(s
, pkt
, curve_id
))
639 return EXT_RETURN_FAIL
;
641 if (!WPACKET_close(pkt
) || !WPACKET_close(pkt
)) {
642 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
643 return EXT_RETURN_FAIL
;
647 return EXT_RETURN_SENT
;
650 EXT_RETURN
tls_construct_ctos_cookie(SSL
*s
, WPACKET
*pkt
, unsigned int context
,
651 X509
*x
, size_t chainidx
, int *al
)
653 EXT_RETURN ret
= EXT_RETURN_FAIL
;
655 /* Should only be set if we've had an HRR */
656 if (s
->ext
.tls13_cookie_len
== 0)
657 return EXT_RETURN_NOT_SENT
;
659 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_cookie
)
660 /* Extension data sub-packet */
661 || !WPACKET_start_sub_packet_u16(pkt
)
662 || !WPACKET_sub_memcpy_u16(pkt
, s
->ext
.tls13_cookie
,
663 s
->ext
.tls13_cookie_len
)
664 || !WPACKET_close(pkt
)) {
665 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_COOKIE
, ERR_R_INTERNAL_ERROR
);
669 ret
= EXT_RETURN_SENT
;
671 OPENSSL_free(s
->ext
.tls13_cookie
);
672 s
->ext
.tls13_cookie
= NULL
;
673 s
->ext
.tls13_cookie_len
= 0;
678 EXT_RETURN
tls_construct_ctos_early_data(SSL
*s
, WPACKET
*pkt
,
679 unsigned int context
, X509
*x
,
680 size_t chainidx
, int *al
)
682 if (s
->early_data_state
!= SSL_EARLY_DATA_CONNECTING
683 || s
->session
->ext
.max_early_data
== 0) {
684 s
->max_early_data
= 0;
685 return EXT_RETURN_NOT_SENT
;
687 s
->max_early_data
= s
->session
->ext
.max_early_data
;
689 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_early_data
)
690 || !WPACKET_start_sub_packet_u16(pkt
)
691 || !WPACKET_close(pkt
)) {
692 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA
, ERR_R_INTERNAL_ERROR
);
693 return EXT_RETURN_FAIL
;
697 * We set this to rejected here. Later, if the server acknowledges the
698 * extension, we set it to accepted.
700 s
->ext
.early_data
= SSL_EARLY_DATA_REJECTED
;
702 return EXT_RETURN_SENT
;
705 #define F5_WORKAROUND_MIN_MSG_LEN 0xff
706 #define F5_WORKAROUND_MAX_MSG_LEN 0x200
709 * PSK pre binder overhead =
710 * 2 bytes for TLSEXT_TYPE_psk
711 * 2 bytes for extension length
712 * 2 bytes for identities list length
713 * 2 bytes for identity length
714 * 4 bytes for obfuscated_ticket_age
715 * 2 bytes for binder list length
716 * 1 byte for binder length
717 * The above excludes the number of bytes for the identity itself and the
718 * subsequent binder bytes
720 #define PSK_PRE_BINDER_OVERHEAD (2 + 2 + 2 + 2 + 4 + 2 + 1)
722 EXT_RETURN
tls_construct_ctos_padding(SSL
*s
, WPACKET
*pkt
,
723 unsigned int context
, X509
*x
,
724 size_t chainidx
, int *al
)
726 unsigned char *padbytes
;
729 if ((s
->options
& SSL_OP_TLSEXT_PADDING
) == 0)
730 return EXT_RETURN_NOT_SENT
;
733 * Add padding to workaround bugs in F5 terminators. See RFC7685.
734 * This code calculates the length of all extensions added so far but
735 * excludes the PSK extension (because that MUST be written last). Therefore
736 * this extension MUST always appear second to last.
738 if (!WPACKET_get_total_written(pkt
, &hlen
)) {
739 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING
, ERR_R_INTERNAL_ERROR
);
740 return EXT_RETURN_FAIL
;
744 * If we're going to send a PSK then that will be written out after this
745 * extension, so we need to calculate how long it is going to be.
747 if (s
->session
->ssl_version
== TLS1_3_VERSION
748 && s
->session
->ext
.ticklen
!= 0
749 && s
->session
->cipher
!= NULL
) {
750 const EVP_MD
*md
= ssl_md(s
->session
->cipher
->algorithm2
);
754 * Add the fixed PSK overhead, the identity length and the binder
757 hlen
+= PSK_PRE_BINDER_OVERHEAD
+ s
->session
->ext
.ticklen
762 if (hlen
> F5_WORKAROUND_MIN_MSG_LEN
&& hlen
< F5_WORKAROUND_MAX_MSG_LEN
) {
763 /* Calculate the amount of padding we need to add */
764 hlen
= F5_WORKAROUND_MAX_MSG_LEN
- hlen
;
767 * Take off the size of extension header itself (2 bytes for type and
768 * 2 bytes for length bytes)
775 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_padding
)
776 || !WPACKET_sub_allocate_bytes_u16(pkt
, hlen
, &padbytes
)) {
777 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING
, ERR_R_INTERNAL_ERROR
);
780 memset(padbytes
, 0, hlen
);
783 return EXT_RETURN_SENT
;
787 * Construct the pre_shared_key extension
789 EXT_RETURN
tls_construct_ctos_psk(SSL
*s
, WPACKET
*pkt
, unsigned int context
,
790 X509
*x
, size_t chainidx
, int *al
)
792 #ifndef OPENSSL_NO_TLS1_3
793 uint32_t now
, agesec
, agems
;
794 size_t hashsize
, binderoffset
, msglen
;
795 unsigned char *binder
= NULL
, *msgstart
= NULL
;
797 EXT_RETURN ret
= EXT_RETURN_FAIL
;
799 s
->session
->ext
.tick_identity
= TLSEXT_PSK_BAD_IDENTITY
;
802 * Note: At this stage of the code we only support adding a single
803 * resumption PSK. If we add support for multiple PSKs then the length
804 * calculations in the padding extension will need to be adjusted.
808 * If this is an incompatible or new session then we have nothing to resume
809 * so don't add this extension.
811 if (s
->session
->ssl_version
!= TLS1_3_VERSION
812 || s
->session
->ext
.ticklen
== 0)
813 return EXT_RETURN_NOT_SENT
;
815 if (s
->session
->cipher
== NULL
) {
816 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK
, ERR_R_INTERNAL_ERROR
);
820 md
= ssl_md(s
->session
->cipher
->algorithm2
);
822 /* Don't recognize this cipher so we can't use the session. Ignore it */
823 return EXT_RETURN_NOT_SENT
;
826 if (s
->hello_retry_request
&& md
!= ssl_handshake_md(s
)) {
828 * Selected ciphersuite hash does not match the hash for the session so
831 return EXT_RETURN_NOT_SENT
;
835 * Technically the C standard just says time() returns a time_t and says
836 * nothing about the encoding of that type. In practice most implementations
837 * follow POSIX which holds it as an integral type in seconds since epoch.
838 * We've already made the assumption that we can do this in multiple places
839 * in the code, so portability shouldn't be an issue.
841 now
= (uint32_t)time(NULL
);
842 agesec
= now
- (uint32_t)s
->session
->time
;
844 if (s
->session
->ext
.tick_lifetime_hint
< agesec
) {
845 /* Ticket is too old. Ignore it. */
846 return EXT_RETURN_NOT_SENT
;
850 * Calculate age in ms. We're just doing it to nearest second. Should be
853 agems
= agesec
* (uint32_t)1000;
855 if (agesec
!= 0 && agems
/ (uint32_t)1000 != agesec
) {
857 * Overflow. Shouldn't happen unless this is a *really* old session. If
858 * so we just ignore it.
860 return EXT_RETURN_NOT_SENT
;
864 * Obfuscate the age. Overflow here is fine, this addition is supposed to
867 agems
+= s
->session
->ext
.tick_age_add
;
869 hashsize
= EVP_MD_size(md
);
871 /* Create the extension, but skip over the binder for now */
872 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_psk
)
873 || !WPACKET_start_sub_packet_u16(pkt
)
874 || !WPACKET_start_sub_packet_u16(pkt
)
875 || !WPACKET_sub_memcpy_u16(pkt
, s
->session
->ext
.tick
,
876 s
->session
->ext
.ticklen
)
877 || !WPACKET_put_bytes_u32(pkt
, agems
)
878 || !WPACKET_close(pkt
)
879 || !WPACKET_get_total_written(pkt
, &binderoffset
)
880 || !WPACKET_start_sub_packet_u16(pkt
)
881 || !WPACKET_sub_allocate_bytes_u8(pkt
, hashsize
, &binder
)
882 || !WPACKET_close(pkt
)
883 || !WPACKET_close(pkt
)
884 || !WPACKET_get_total_written(pkt
, &msglen
)
886 * We need to fill in all the sub-packet lengths now so we can
887 * calculate the HMAC of the message up to the binders
889 || !WPACKET_fill_lengths(pkt
)) {
890 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK
, ERR_R_INTERNAL_ERROR
);
894 msgstart
= WPACKET_get_curr(pkt
) - msglen
;
896 if (tls_psk_do_binder(s
, md
, msgstart
, binderoffset
, NULL
, binder
,
897 s
->session
, 1, 0) != 1) {
898 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK
, ERR_R_INTERNAL_ERROR
);
902 s
->session
->ext
.tick_identity
= 0;
904 ret
= EXT_RETURN_SENT
;
913 * Parse the server's renegotiation binding and abort if it's not right
915 int tls_parse_stoc_renegotiate(SSL
*s
, PACKET
*pkt
, unsigned int context
,
916 X509
*x
, size_t chainidx
, int *al
)
918 size_t expected_len
= s
->s3
->previous_client_finished_len
919 + s
->s3
->previous_server_finished_len
;
921 const unsigned char *data
;
923 /* Check for logic errors */
924 if (!ossl_assert(expected_len
== 0
925 || s
->s3
->previous_client_finished_len
!= 0)
926 || !ossl_assert(expected_len
== 0
927 || s
->s3
->previous_server_finished_len
!= 0)) {
928 *al
= SSL_AD_INTERNAL_ERROR
;
932 /* Parse the length byte */
933 if (!PACKET_get_1_len(pkt
, &ilen
)) {
934 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE
,
935 SSL_R_RENEGOTIATION_ENCODING_ERR
);
936 *al
= SSL_AD_DECODE_ERROR
;
940 /* Consistency check */
941 if (PACKET_remaining(pkt
) != ilen
) {
942 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE
,
943 SSL_R_RENEGOTIATION_ENCODING_ERR
);
944 *al
= SSL_AD_DECODE_ERROR
;
948 /* Check that the extension matches */
949 if (ilen
!= expected_len
) {
950 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE
,
951 SSL_R_RENEGOTIATION_MISMATCH
);
952 *al
= SSL_AD_ILLEGAL_PARAMETER
;
956 if (!PACKET_get_bytes(pkt
, &data
, s
->s3
->previous_client_finished_len
)
957 || memcmp(data
, s
->s3
->previous_client_finished
,
958 s
->s3
->previous_client_finished_len
) != 0) {
959 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE
,
960 SSL_R_RENEGOTIATION_MISMATCH
);
961 *al
= SSL_AD_ILLEGAL_PARAMETER
;
965 if (!PACKET_get_bytes(pkt
, &data
, s
->s3
->previous_server_finished_len
)
966 || memcmp(data
, s
->s3
->previous_server_finished
,
967 s
->s3
->previous_server_finished_len
) != 0) {
968 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE
,
969 SSL_R_RENEGOTIATION_MISMATCH
);
970 *al
= SSL_AD_ILLEGAL_PARAMETER
;
973 s
->s3
->send_connection_binding
= 1;
978 int tls_parse_stoc_server_name(SSL
*s
, PACKET
*pkt
, unsigned int context
,
979 X509
*x
, size_t chainidx
, int *al
)
981 if (s
->ext
.hostname
== NULL
) {
982 *al
= SSL_AD_INTERNAL_ERROR
;
986 if (PACKET_remaining(pkt
) > 0) {
987 *al
= SSL_AD_DECODE_ERROR
;
992 if (s
->session
->ext
.hostname
!= NULL
) {
993 *al
= SSL_AD_INTERNAL_ERROR
;
996 s
->session
->ext
.hostname
= OPENSSL_strdup(s
->ext
.hostname
);
997 if (s
->session
->ext
.hostname
== NULL
) {
998 *al
= SSL_AD_INTERNAL_ERROR
;
1006 #ifndef OPENSSL_NO_EC
1007 int tls_parse_stoc_ec_pt_formats(SSL
*s
, PACKET
*pkt
, unsigned int context
,
1008 X509
*x
, size_t chainidx
, int *al
)
1010 unsigned int ecpointformats_len
;
1011 PACKET ecptformatlist
;
1013 if (!PACKET_as_length_prefixed_1(pkt
, &ecptformatlist
)) {
1014 *al
= SSL_AD_DECODE_ERROR
;
1018 ecpointformats_len
= PACKET_remaining(&ecptformatlist
);
1019 s
->session
->ext
.ecpointformats_len
= 0;
1021 OPENSSL_free(s
->session
->ext
.ecpointformats
);
1022 s
->session
->ext
.ecpointformats
= OPENSSL_malloc(ecpointformats_len
);
1023 if (s
->session
->ext
.ecpointformats
== NULL
) {
1024 *al
= SSL_AD_INTERNAL_ERROR
;
1028 s
->session
->ext
.ecpointformats_len
= ecpointformats_len
;
1030 if (!PACKET_copy_bytes(&ecptformatlist
,
1031 s
->session
->ext
.ecpointformats
,
1032 ecpointformats_len
)) {
1033 *al
= SSL_AD_INTERNAL_ERROR
;
1042 int tls_parse_stoc_session_ticket(SSL
*s
, PACKET
*pkt
, unsigned int context
,
1043 X509
*x
, size_t chainidx
, int *al
)
1045 if (s
->ext
.session_ticket_cb
!= NULL
&&
1046 !s
->ext
.session_ticket_cb(s
, PACKET_data(pkt
),
1047 PACKET_remaining(pkt
),
1048 s
->ext
.session_ticket_cb_arg
)) {
1049 *al
= SSL_AD_INTERNAL_ERROR
;
1053 if (!tls_use_ticket(s
)) {
1054 *al
= SSL_AD_UNSUPPORTED_EXTENSION
;
1057 if (PACKET_remaining(pkt
) > 0) {
1058 *al
= SSL_AD_DECODE_ERROR
;
1062 s
->ext
.ticket_expected
= 1;
1067 #ifndef OPENSSL_NO_OCSP
1068 int tls_parse_stoc_status_request(SSL
*s
, PACKET
*pkt
, unsigned int context
,
1069 X509
*x
, size_t chainidx
, int *al
)
1072 * MUST only be sent if we've requested a status
1073 * request message. In TLS <= 1.2 it must also be empty.
1075 if (s
->ext
.status_type
!= TLSEXT_STATUSTYPE_ocsp
) {
1076 *al
= SSL_AD_UNSUPPORTED_EXTENSION
;
1079 if (!SSL_IS_TLS13(s
) && PACKET_remaining(pkt
) > 0) {
1080 *al
= SSL_AD_DECODE_ERROR
;
1084 if (SSL_IS_TLS13(s
)) {
1085 /* We only know how to handle this if it's for the first Certificate in
1086 * the chain. We ignore any other responses.
1090 return tls_process_cert_status_body(s
, pkt
, al
);
1093 /* Set flag to expect CertificateStatus message */
1094 s
->ext
.status_expected
= 1;
1101 #ifndef OPENSSL_NO_CT
1102 int tls_parse_stoc_sct(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1103 size_t chainidx
, int *al
)
1106 * Only take it if we asked for it - i.e if there is no CT validation
1107 * callback set, then a custom extension MAY be processing it, so we
1108 * need to let control continue to flow to that.
1110 if (s
->ct_validation_callback
!= NULL
) {
1111 size_t size
= PACKET_remaining(pkt
);
1113 /* Simply copy it off for later processing */
1114 OPENSSL_free(s
->ext
.scts
);
1117 s
->ext
.scts_len
= size
;
1119 s
->ext
.scts
= OPENSSL_malloc(size
);
1120 if (s
->ext
.scts
== NULL
1121 || !PACKET_copy_bytes(pkt
, s
->ext
.scts
, size
)) {
1122 *al
= SSL_AD_INTERNAL_ERROR
;
1127 ENDPOINT role
= (context
& SSL_EXT_TLS1_2_SERVER_HELLO
) != 0
1128 ? ENDPOINT_CLIENT
: ENDPOINT_BOTH
;
1131 * If we didn't ask for it then there must be a custom extension,
1132 * otherwise this is unsolicited.
1134 if (custom_ext_find(&s
->cert
->custext
, role
,
1135 TLSEXT_TYPE_signed_certificate_timestamp
,
1137 *al
= TLS1_AD_UNSUPPORTED_EXTENSION
;
1141 if (custom_ext_parse(s
, context
,
1142 TLSEXT_TYPE_signed_certificate_timestamp
,
1143 PACKET_data(pkt
), PACKET_remaining(pkt
),
1144 x
, chainidx
, al
) <= 0)
1153 #ifndef OPENSSL_NO_NEXTPROTONEG
1155 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1156 * elements of zero length are allowed and the set of elements must exactly
1157 * fill the length of the block. Returns 1 on success or 0 on failure.
1159 static int ssl_next_proto_validate(PACKET
*pkt
)
1161 PACKET tmp_protocol
;
1163 while (PACKET_remaining(pkt
)) {
1164 if (!PACKET_get_length_prefixed_1(pkt
, &tmp_protocol
)
1165 || PACKET_remaining(&tmp_protocol
) == 0)
1172 int tls_parse_stoc_npn(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1173 size_t chainidx
, int *al
)
1175 unsigned char *selected
;
1176 unsigned char selected_len
;
1179 /* Check if we are in a renegotiation. If so ignore this extension */
1180 if (!SSL_IS_FIRST_HANDSHAKE(s
))
1183 /* We must have requested it. */
1184 if (s
->ctx
->ext
.npn_select_cb
== NULL
) {
1185 *al
= SSL_AD_UNSUPPORTED_EXTENSION
;
1189 /* The data must be valid */
1191 if (!ssl_next_proto_validate(&tmppkt
)) {
1192 *al
= SSL_AD_DECODE_ERROR
;
1195 if (s
->ctx
->ext
.npn_select_cb(s
, &selected
, &selected_len
,
1197 PACKET_remaining(pkt
),
1198 s
->ctx
->ext
.npn_select_cb_arg
) !=
1199 SSL_TLSEXT_ERR_OK
) {
1200 *al
= SSL_AD_INTERNAL_ERROR
;
1205 * Could be non-NULL if server has sent multiple NPN extensions in
1206 * a single Serverhello
1208 OPENSSL_free(s
->ext
.npn
);
1209 s
->ext
.npn
= OPENSSL_malloc(selected_len
);
1210 if (s
->ext
.npn
== NULL
) {
1211 *al
= SSL_AD_INTERNAL_ERROR
;
1215 memcpy(s
->ext
.npn
, selected
, selected_len
);
1216 s
->ext
.npn_len
= selected_len
;
1217 s
->s3
->npn_seen
= 1;
1223 int tls_parse_stoc_alpn(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1224 size_t chainidx
, int *al
)
1228 /* We must have requested it. */
1229 if (!s
->s3
->alpn_sent
) {
1230 *al
= SSL_AD_UNSUPPORTED_EXTENSION
;
1234 * The extension data consists of:
1235 * uint16 list_length
1236 * uint8 proto_length;
1237 * uint8 proto[proto_length];
1239 if (!PACKET_get_net_2_len(pkt
, &len
)
1240 || PACKET_remaining(pkt
) != len
|| !PACKET_get_1_len(pkt
, &len
)
1241 || PACKET_remaining(pkt
) != len
) {
1242 *al
= SSL_AD_DECODE_ERROR
;
1245 OPENSSL_free(s
->s3
->alpn_selected
);
1246 s
->s3
->alpn_selected
= OPENSSL_malloc(len
);
1247 if (s
->s3
->alpn_selected
== NULL
) {
1248 *al
= SSL_AD_INTERNAL_ERROR
;
1251 if (!PACKET_copy_bytes(pkt
, s
->s3
->alpn_selected
, len
)) {
1252 *al
= SSL_AD_DECODE_ERROR
;
1255 s
->s3
->alpn_selected_len
= len
;
1260 #ifndef OPENSSL_NO_SRTP
1261 int tls_parse_stoc_use_srtp(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1262 size_t chainidx
, int *al
)
1264 unsigned int id
, ct
, mki
;
1266 STACK_OF(SRTP_PROTECTION_PROFILE
) *clnt
;
1267 SRTP_PROTECTION_PROFILE
*prof
;
1269 if (!PACKET_get_net_2(pkt
, &ct
) || ct
!= 2
1270 || !PACKET_get_net_2(pkt
, &id
)
1271 || !PACKET_get_1(pkt
, &mki
)
1272 || PACKET_remaining(pkt
) != 0) {
1273 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP
,
1274 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST
);
1275 *al
= SSL_AD_DECODE_ERROR
;
1280 /* Must be no MKI, since we never offer one */
1281 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP
, SSL_R_BAD_SRTP_MKI_VALUE
);
1282 *al
= SSL_AD_ILLEGAL_PARAMETER
;
1286 /* Throw an error if the server gave us an unsolicited extension */
1287 clnt
= SSL_get_srtp_profiles(s
);
1289 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP
, SSL_R_NO_SRTP_PROFILES
);
1290 *al
= SSL_AD_DECODE_ERROR
;
1295 * Check to see if the server gave us something we support (and
1296 * presumably offered)
1298 for (i
= 0; i
< sk_SRTP_PROTECTION_PROFILE_num(clnt
); i
++) {
1299 prof
= sk_SRTP_PROTECTION_PROFILE_value(clnt
, i
);
1301 if (prof
->id
== id
) {
1302 s
->srtp_profile
= prof
;
1308 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP
,
1309 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST
);
1310 *al
= SSL_AD_DECODE_ERROR
;
1315 int tls_parse_stoc_etm(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1316 size_t chainidx
, int *al
)
1318 /* Ignore if inappropriate ciphersuite */
1319 if (!(s
->options
& SSL_OP_NO_ENCRYPT_THEN_MAC
)
1320 && s
->s3
->tmp
.new_cipher
->algorithm_mac
!= SSL_AEAD
1321 && s
->s3
->tmp
.new_cipher
->algorithm_enc
!= SSL_RC4
)
1327 int tls_parse_stoc_ems(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1328 size_t chainidx
, int *al
)
1330 s
->s3
->flags
|= TLS1_FLAGS_RECEIVED_EXTMS
;
1332 s
->session
->flags
|= SSL_SESS_FLAG_EXTMS
;
1337 int tls_parse_stoc_key_share(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1338 size_t chainidx
, int *al
)
1340 #ifndef OPENSSL_NO_TLS1_3
1341 unsigned int group_id
;
1343 EVP_PKEY
*ckey
= s
->s3
->tmp
.pkey
, *skey
= NULL
;
1346 if (ckey
== NULL
|| s
->s3
->peer_tmp
!= NULL
) {
1347 *al
= SSL_AD_INTERNAL_ERROR
;
1348 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
1352 if (!PACKET_get_net_2(pkt
, &group_id
)) {
1353 *al
= SSL_AD_DECODE_ERROR
;
1354 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, SSL_R_LENGTH_MISMATCH
);
1358 if ((context
& SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST
) != 0) {
1359 unsigned const char *pcurves
= NULL
;
1360 size_t i
, num_curves
;
1362 if (PACKET_remaining(pkt
) != 0) {
1363 *al
= SSL_AD_DECODE_ERROR
;
1364 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, SSL_R_LENGTH_MISMATCH
);
1369 * It is an error if the HelloRetryRequest wants a key_share that we
1370 * already sent in the first ClientHello
1372 if (group_id
== s
->s3
->group_id
) {
1373 *al
= SSL_AD_ILLEGAL_PARAMETER
;
1374 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, SSL_R_BAD_KEY_SHARE
);
1378 /* Validate the selected group is one we support */
1379 if (!tls1_get_curvelist(s
, 0, &pcurves
, &num_curves
)) {
1380 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
1383 for (i
= 0; i
< num_curves
; i
++, pcurves
+= 2) {
1384 if (group_id
== bytestogroup(pcurves
))
1388 || !tls_curve_allowed(s
, pcurves
, SSL_SECOP_CURVE_SUPPORTED
)) {
1389 *al
= SSL_AD_ILLEGAL_PARAMETER
;
1390 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, SSL_R_BAD_KEY_SHARE
);
1394 s
->s3
->group_id
= group_id
;
1395 EVP_PKEY_free(s
->s3
->tmp
.pkey
);
1396 s
->s3
->tmp
.pkey
= NULL
;
1400 if (group_id
!= s
->s3
->group_id
) {
1402 * This isn't for the group that we sent in the original
1405 *al
= SSL_AD_ILLEGAL_PARAMETER
;
1406 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, SSL_R_BAD_KEY_SHARE
);
1410 if (!PACKET_as_length_prefixed_2(pkt
, &encoded_pt
)
1411 || PACKET_remaining(&encoded_pt
) == 0) {
1412 *al
= SSL_AD_DECODE_ERROR
;
1413 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, SSL_R_LENGTH_MISMATCH
);
1417 skey
= ssl_generate_pkey(ckey
);
1419 *al
= SSL_AD_INTERNAL_ERROR
;
1420 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, ERR_R_MALLOC_FAILURE
);
1423 if (!EVP_PKEY_set1_tls_encodedpoint(skey
, PACKET_data(&encoded_pt
),
1424 PACKET_remaining(&encoded_pt
))) {
1425 *al
= SSL_AD_ILLEGAL_PARAMETER
;
1426 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, SSL_R_BAD_ECPOINT
);
1427 EVP_PKEY_free(skey
);
1431 if (ssl_derive(s
, ckey
, skey
, 1) == 0) {
1432 *al
= SSL_AD_INTERNAL_ERROR
;
1433 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
1434 EVP_PKEY_free(skey
);
1437 s
->s3
->peer_tmp
= skey
;
1443 int tls_parse_stoc_cookie(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1444 size_t chainidx
, int *al
)
1448 if (!PACKET_as_length_prefixed_2(pkt
, &cookie
)
1449 || !PACKET_memdup(&cookie
, &s
->ext
.tls13_cookie
,
1450 &s
->ext
.tls13_cookie_len
)) {
1451 *al
= SSL_AD_DECODE_ERROR
;
1452 SSLerr(SSL_F_TLS_PARSE_STOC_COOKIE
, SSL_R_LENGTH_MISMATCH
);
1459 int tls_parse_stoc_early_data(SSL
*s
, PACKET
*pkt
, unsigned int context
,
1460 X509
*x
, size_t chainidx
, int *al
)
1462 if (context
== SSL_EXT_TLS1_3_NEW_SESSION_TICKET
) {
1463 unsigned long max_early_data
;
1465 if (!PACKET_get_net_4(pkt
, &max_early_data
)
1466 || PACKET_remaining(pkt
) != 0) {
1467 SSLerr(SSL_F_TLS_PARSE_STOC_EARLY_DATA
,
1468 SSL_R_INVALID_MAX_EARLY_DATA
);
1469 *al
= SSL_AD_DECODE_ERROR
;
1473 s
->session
->ext
.max_early_data
= max_early_data
;
1478 if (PACKET_remaining(pkt
) != 0) {
1479 *al
= SSL_AD_DECODE_ERROR
;
1483 if (s
->ext
.early_data
!= SSL_EARLY_DATA_REJECTED
1485 || s
->session
->ext
.tick_identity
!= 0) {
1487 * If we get here then we didn't send early data, or we didn't resume
1488 * using the first identity so the server should not be accepting it.
1490 *al
= SSL_AD_ILLEGAL_PARAMETER
;
1494 s
->ext
.early_data
= SSL_EARLY_DATA_ACCEPTED
;
1499 int tls_parse_stoc_psk(SSL
*s
, PACKET
*pkt
, unsigned int context
, X509
*x
,
1500 size_t chainidx
, int *al
)
1502 #ifndef OPENSSL_NO_TLS1_3
1503 unsigned int identity
;
1505 if (!PACKET_get_net_2(pkt
, &identity
) || PACKET_remaining(pkt
) != 0) {
1506 *al
= SSL_AD_DECODE_ERROR
;
1507 SSLerr(SSL_F_TLS_PARSE_STOC_PSK
, SSL_R_LENGTH_MISMATCH
);
1511 if (s
->session
->ext
.tick_identity
!= (int)identity
) {
1512 *al
= SSL_AD_ILLEGAL_PARAMETER
;
1513 SSLerr(SSL_F_TLS_PARSE_STOC_PSK
, SSL_R_BAD_PSK_IDENTITY
);