2 * Copyright 2016 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
11 #include <openssl/ocsp.h>
12 #include "../ssl_locl.h"
13 #include "statem_locl.h"
15 int tls_construct_ctos_renegotiate(SSL
*s
, WPACKET
*pkt
, X509
*x
,
16 size_t chainidx
, int *al
)
18 /* Add RI if renegotiating */
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
);
34 int tls_construct_ctos_server_name(SSL
*s
, WPACKET
*pkt
, X509
*x
,
35 size_t chainidx
, int *al
)
37 if (s
->ext
.hostname
== NULL
)
40 /* Add TLS extension servername to the Client Hello message */
41 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_server_name
)
42 /* Sub-packet for server_name extension */
43 || !WPACKET_start_sub_packet_u16(pkt
)
44 /* Sub-packet for servername list (always 1 hostname)*/
45 || !WPACKET_start_sub_packet_u16(pkt
)
46 || !WPACKET_put_bytes_u8(pkt
, TLSEXT_NAMETYPE_host_name
)
47 || !WPACKET_sub_memcpy_u16(pkt
, s
->ext
.hostname
,
48 strlen(s
->ext
.hostname
))
49 || !WPACKET_close(pkt
)
50 || !WPACKET_close(pkt
)) {
51 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SERVER_NAME
, ERR_R_INTERNAL_ERROR
);
58 #ifndef OPENSSL_NO_SRP
59 int tls_construct_ctos_srp(SSL
*s
, WPACKET
*pkt
, X509
*x
, size_t chainidx
,
62 /* Add SRP username if there is one */
63 if (s
->srp_ctx
.login
== NULL
)
66 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_srp
)
67 /* Sub-packet for SRP extension */
68 || !WPACKET_start_sub_packet_u16(pkt
)
69 || !WPACKET_start_sub_packet_u8(pkt
)
70 /* login must not be zero...internal error if so */
71 || !WPACKET_set_flags(pkt
, WPACKET_FLAGS_NON_ZERO_LENGTH
)
72 || !WPACKET_memcpy(pkt
, s
->srp_ctx
.login
,
73 strlen(s
->srp_ctx
.login
))
74 || !WPACKET_close(pkt
)
75 || !WPACKET_close(pkt
)) {
76 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SRP
, ERR_R_INTERNAL_ERROR
);
85 static int use_ecc(SSL
*s
)
88 unsigned long alg_k
, alg_a
;
89 STACK_OF(SSL_CIPHER
) *cipher_stack
= NULL
;
91 /* See if we support any ECC ciphersuites */
92 if (s
->version
== SSL3_VERSION
)
95 cipher_stack
= SSL_get_ciphers(s
);
96 end
= sk_SSL_CIPHER_num(cipher_stack
);
97 for (i
= 0; i
< end
; i
++) {
98 const SSL_CIPHER
*c
= sk_SSL_CIPHER_value(cipher_stack
, i
);
100 alg_k
= c
->algorithm_mkey
;
101 alg_a
= c
->algorithm_auth
;
102 if ((alg_k
& (SSL_kECDHE
| SSL_kECDHEPSK
))
103 || (alg_a
& SSL_aECDSA
)
104 || c
->min_tls
>= TLS1_3_VERSION
)
111 int tls_construct_ctos_ec_pt_formats(SSL
*s
, WPACKET
*pkt
, X509
*x
,
112 size_t chainidx
, int *al
)
114 const unsigned char *pformats
;
120 /* Add TLS extension ECPointFormats to the ClientHello message */
121 tls1_get_formatlist(s
, &pformats
, &num_formats
);
123 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_ec_point_formats
)
124 /* Sub-packet for formats extension */
125 || !WPACKET_start_sub_packet_u16(pkt
)
126 || !WPACKET_sub_memcpy_u8(pkt
, pformats
, num_formats
)
127 || !WPACKET_close(pkt
)) {
128 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EC_PT_FORMATS
, ERR_R_INTERNAL_ERROR
);
135 int tls_construct_ctos_supported_groups(SSL
*s
, WPACKET
*pkt
, X509
*x
,
136 size_t chainidx
, int *al
)
138 const unsigned char *pcurves
= NULL
, *pcurvestmp
;
139 size_t num_curves
= 0, i
;
145 * Add TLS extension supported_groups to the ClientHello message
147 /* TODO(TLS1.3): Add support for DHE groups */
148 pcurves
= s
->ext
.supportedgroups
;
149 if (!tls1_get_curvelist(s
, 0, &pcurves
, &num_curves
)) {
150 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS
,
151 ERR_R_INTERNAL_ERROR
);
154 pcurvestmp
= pcurves
;
156 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_supported_groups
)
157 /* Sub-packet for supported_groups extension */
158 || !WPACKET_start_sub_packet_u16(pkt
)
159 || !WPACKET_start_sub_packet_u16(pkt
)) {
160 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS
,
161 ERR_R_INTERNAL_ERROR
);
164 /* Copy curve ID if supported */
165 for (i
= 0; i
< num_curves
; i
++, pcurvestmp
+= 2) {
166 if (tls_curve_allowed(s
, pcurves
, SSL_SECOP_CURVE_SUPPORTED
)) {
167 if (!WPACKET_put_bytes_u8(pkt
, pcurvestmp
[0])
168 || !WPACKET_put_bytes_u8(pkt
, pcurvestmp
[1])) {
169 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS
,
170 ERR_R_INTERNAL_ERROR
);
175 if (!WPACKET_close(pkt
) || !WPACKET_close(pkt
)) {
176 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS
,
177 ERR_R_INTERNAL_ERROR
);
185 int tls_construct_ctos_session_ticket(SSL
*s
, WPACKET
*pkt
, X509
*x
,
186 size_t chainidx
, int *al
)
190 if (!tls_use_ticket(s
))
193 if (!s
->new_session
&& s
->session
!= NULL
194 && s
->session
->ext
.tick
!= NULL
195 && s
->session
->ssl_version
!= TLS1_3_VERSION
) {
196 ticklen
= s
->session
->ext
.ticklen
;
197 } else if (s
->session
&& s
->ext
.session_ticket
!= NULL
198 && s
->ext
.session_ticket
->data
!= NULL
) {
199 ticklen
= s
->ext
.session_ticket
->length
;
200 s
->session
->ext
.tick
= OPENSSL_malloc(ticklen
);
201 if (s
->session
->ext
.tick
== NULL
) {
202 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET
,
203 ERR_R_INTERNAL_ERROR
);
206 memcpy(s
->session
->ext
.tick
,
207 s
->ext
.session_ticket
->data
, ticklen
);
208 s
->session
->ext
.ticklen
= ticklen
;
213 if (ticklen
== 0 && s
->ext
.session_ticket
!= NULL
&&
214 s
->ext
.session_ticket
->data
== NULL
)
217 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_session_ticket
)
218 || !WPACKET_sub_memcpy_u16(pkt
, s
->session
->ext
.tick
, ticklen
)) {
219 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET
, ERR_R_INTERNAL_ERROR
);
226 int tls_construct_ctos_sig_algs(SSL
*s
, WPACKET
*pkt
, X509
*x
, size_t chainidx
,
230 const unsigned int *salg
;
232 if (!SSL_CLIENT_USE_SIGALGS(s
))
235 salglen
= tls12_get_psigalgs(s
, 1, &salg
);
236 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_signature_algorithms
)
237 /* Sub-packet for sig-algs extension */
238 || !WPACKET_start_sub_packet_u16(pkt
)
239 /* Sub-packet for the actual list */
240 || !WPACKET_start_sub_packet_u16(pkt
)
241 || !tls12_copy_sigalgs(s
, pkt
, salg
, salglen
)
242 || !WPACKET_close(pkt
)
243 || !WPACKET_close(pkt
)) {
244 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SIG_ALGS
, ERR_R_INTERNAL_ERROR
);
251 #ifndef OPENSSL_NO_OCSP
252 int tls_construct_ctos_status_request(SSL
*s
, WPACKET
*pkt
, X509
*x
,
253 size_t chainidx
, int *al
)
257 /* This extension isn't defined for client Certificates */
261 if (s
->ext
.status_type
!= TLSEXT_STATUSTYPE_ocsp
)
264 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_status_request
)
265 /* Sub-packet for status request extension */
266 || !WPACKET_start_sub_packet_u16(pkt
)
267 || !WPACKET_put_bytes_u8(pkt
, TLSEXT_STATUSTYPE_ocsp
)
268 /* Sub-packet for the ids */
269 || !WPACKET_start_sub_packet_u16(pkt
)) {
270 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
, ERR_R_INTERNAL_ERROR
);
273 for (i
= 0; i
< sk_OCSP_RESPID_num(s
->ext
.ocsp
.ids
); i
++) {
274 unsigned char *idbytes
;
275 OCSP_RESPID
*id
= sk_OCSP_RESPID_value(s
->ext
.ocsp
.ids
, i
);
276 int idlen
= i2d_OCSP_RESPID(id
, NULL
);
279 /* Sub-packet for an individual id */
280 || !WPACKET_sub_allocate_bytes_u16(pkt
, idlen
, &idbytes
)
281 || i2d_OCSP_RESPID(id
, &idbytes
) != idlen
) {
282 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
,
283 ERR_R_INTERNAL_ERROR
);
287 if (!WPACKET_close(pkt
)
288 || !WPACKET_start_sub_packet_u16(pkt
)) {
289 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
, ERR_R_INTERNAL_ERROR
);
292 if (s
->ext
.ocsp
.exts
) {
293 unsigned char *extbytes
;
294 int extlen
= i2d_X509_EXTENSIONS(s
->ext
.ocsp
.exts
, NULL
);
297 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
,
298 ERR_R_INTERNAL_ERROR
);
301 if (!WPACKET_allocate_bytes(pkt
, extlen
, &extbytes
)
302 || i2d_X509_EXTENSIONS(s
->ext
.ocsp
.exts
, &extbytes
)
304 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
,
305 ERR_R_INTERNAL_ERROR
);
309 if (!WPACKET_close(pkt
) || !WPACKET_close(pkt
)) {
310 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST
, ERR_R_INTERNAL_ERROR
);
318 #ifndef OPENSSL_NO_NEXTPROTONEG
319 int tls_construct_ctos_npn(SSL
*s
, WPACKET
*pkt
, X509
*x
, size_t chainidx
,
322 if (s
->ctx
->ext
.npn_select_cb
== NULL
|| !SSL_IS_FIRST_HANDSHAKE(s
))
326 * The client advertises an empty extension to indicate its support
327 * for Next Protocol Negotiation
329 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_next_proto_neg
)
330 || !WPACKET_put_bytes_u16(pkt
, 0)) {
331 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_NPN
, ERR_R_INTERNAL_ERROR
);
339 int tls_construct_ctos_alpn(SSL
*s
, WPACKET
*pkt
, X509
*x
, size_t chainidx
,
342 s
->s3
->alpn_sent
= 0;
344 if (s
->ext
.alpn
== NULL
|| !SSL_IS_FIRST_HANDSHAKE(s
))
347 if (!WPACKET_put_bytes_u16(pkt
,
348 TLSEXT_TYPE_application_layer_protocol_negotiation
)
349 /* Sub-packet ALPN extension */
350 || !WPACKET_start_sub_packet_u16(pkt
)
351 || !WPACKET_sub_memcpy_u16(pkt
, s
->ext
.alpn
, s
->ext
.alpn_len
)
352 || !WPACKET_close(pkt
)) {
353 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ALPN
, ERR_R_INTERNAL_ERROR
);
356 s
->s3
->alpn_sent
= 1;
362 #ifndef OPENSSL_NO_SRTP
363 int tls_construct_ctos_use_srtp(SSL
*s
, WPACKET
*pkt
, X509
*x
, size_t chainidx
,
366 STACK_OF(SRTP_PROTECTION_PROFILE
) *clnt
= SSL_get_srtp_profiles(s
);
372 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_use_srtp
)
373 /* Sub-packet for SRTP extension */
374 || !WPACKET_start_sub_packet_u16(pkt
)
375 /* Sub-packet for the protection profile list */
376 || !WPACKET_start_sub_packet_u16(pkt
)) {
377 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP
, ERR_R_INTERNAL_ERROR
);
381 end
= sk_SRTP_PROTECTION_PROFILE_num(clnt
);
382 for (i
= 0; i
< end
; i
++) {
383 const SRTP_PROTECTION_PROFILE
*prof
=
384 sk_SRTP_PROTECTION_PROFILE_value(clnt
, i
);
386 if (prof
== NULL
|| !WPACKET_put_bytes_u16(pkt
, prof
->id
)) {
387 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP
, ERR_R_INTERNAL_ERROR
);
391 if (!WPACKET_close(pkt
)
392 /* Add an empty use_mki value */
393 || !WPACKET_put_bytes_u8(pkt
, 0)
394 || !WPACKET_close(pkt
)) {
395 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP
, ERR_R_INTERNAL_ERROR
);
403 int tls_construct_ctos_etm(SSL
*s
, WPACKET
*pkt
, X509
*x
, size_t chainidx
,
406 if (s
->options
& SSL_OP_NO_ENCRYPT_THEN_MAC
)
409 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_encrypt_then_mac
)
410 || !WPACKET_put_bytes_u16(pkt
, 0)) {
411 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ETM
, ERR_R_INTERNAL_ERROR
);
418 #ifndef OPENSSL_NO_CT
419 int tls_construct_ctos_sct(SSL
*s
, WPACKET
*pkt
, X509
*x
, size_t chainidx
,
422 if (s
->ct_validation_callback
== NULL
)
425 /* Not defined for client Certificates */
429 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_signed_certificate_timestamp
)
430 || !WPACKET_put_bytes_u16(pkt
, 0)) {
431 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SCT
, ERR_R_INTERNAL_ERROR
);
439 int tls_construct_ctos_ems(SSL
*s
, WPACKET
*pkt
, X509
*x
, size_t chainidx
,
442 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_extended_master_secret
)
443 || !WPACKET_put_bytes_u16(pkt
, 0)) {
444 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EMS
, ERR_R_INTERNAL_ERROR
);
451 int tls_construct_ctos_supported_versions(SSL
*s
, WPACKET
*pkt
, X509
*x
,
452 size_t chainidx
, int *al
)
454 int currv
, min_version
, max_version
, reason
;
456 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_supported_versions
)
457 || !WPACKET_start_sub_packet_u16(pkt
)
458 || !WPACKET_start_sub_packet_u8(pkt
)) {
459 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS
,
460 ERR_R_INTERNAL_ERROR
);
464 reason
= ssl_get_client_min_max_version(s
, &min_version
, &max_version
);
466 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS
, reason
);
471 * TODO(TLS1.3): There is some discussion on the TLS list as to wheter
472 * we should include versions <TLS1.2. For the moment we do. To be
475 for (currv
= max_version
; currv
>= min_version
; currv
--) {
476 /* TODO(TLS1.3): Remove this first if clause prior to release!! */
477 if (currv
== TLS1_3_VERSION
) {
478 if (!WPACKET_put_bytes_u16(pkt
, TLS1_3_VERSION_DRAFT
)) {
479 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS
,
480 ERR_R_INTERNAL_ERROR
);
483 } else if (!WPACKET_put_bytes_u16(pkt
, currv
)) {
484 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS
,
485 ERR_R_INTERNAL_ERROR
);
489 if (!WPACKET_close(pkt
) || !WPACKET_close(pkt
)) {
490 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS
,
491 ERR_R_INTERNAL_ERROR
);
499 * Construct a psk_kex_modes extension. We only have two modes we know about
500 * at this stage, so we send both.
502 int tls_construct_ctos_psk_kex_modes(SSL
*s
, WPACKET
*pkt
, X509
*x
,
503 size_t chainidx
, int *al
)
505 #ifndef OPENSSL_NO_TLS1_3
507 * TODO(TLS1.3): Do we want this list to be configurable? For now we always
508 * just send both supported modes
510 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_psk_kex_modes
)
511 || !WPACKET_start_sub_packet_u16(pkt
)
512 || !WPACKET_start_sub_packet_u8(pkt
)
513 || !WPACKET_put_bytes_u8(pkt
, TLSEXT_KEX_MODE_KE_DHE
)
514 || !WPACKET_put_bytes_u8(pkt
, TLSEXT_KEX_MODE_KE
)
515 || !WPACKET_close(pkt
)
516 || !WPACKET_close(pkt
)) {
517 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK_KEX_MODES
, ERR_R_INTERNAL_ERROR
);
521 s
->ext
.psk_kex_mode
= TLSEXT_KEX_MODE_FLAG_KE
| TLSEXT_KEX_MODE_FLAG_KE_DHE
;
527 int tls_construct_ctos_key_share(SSL
*s
, WPACKET
*pkt
, X509
*x
, size_t chainidx
,
530 #ifndef OPENSSL_NO_TLS1_3
531 size_t i
, sharessent
= 0, num_curves
= 0;
532 const unsigned char *pcurves
= NULL
;
534 /* key_share extension */
535 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_key_share
)
536 /* Extension data sub-packet */
537 || !WPACKET_start_sub_packet_u16(pkt
)
538 /* KeyShare list sub-packet */
539 || !WPACKET_start_sub_packet_u16(pkt
)) {
540 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
544 pcurves
= s
->ext
.supportedgroups
;
545 if (!tls1_get_curvelist(s
, 0, &pcurves
, &num_curves
)) {
546 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
551 * TODO(TLS1.3): Make the number of key_shares sent configurable. For
554 for (i
= 0; i
< num_curves
&& sharessent
< 1; i
++, pcurves
+= 2) {
555 unsigned char *encodedPoint
= NULL
;
556 unsigned int curve_id
= 0;
557 EVP_PKEY
*key_share_key
= NULL
;
560 if (!tls_curve_allowed(s
, pcurves
, SSL_SECOP_CURVE_SUPPORTED
))
563 if (s
->s3
->tmp
.pkey
!= NULL
) {
564 /* Shouldn't happen! */
565 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
569 /* Generate a key for this key_share */
570 curve_id
= (pcurves
[0] << 8) | pcurves
[1];
571 key_share_key
= ssl_generate_pkey_curve(curve_id
);
572 if (key_share_key
== NULL
) {
573 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE
, ERR_R_EVP_LIB
);
577 /* Encode the public key. */
578 encodedlen
= EVP_PKEY_get1_tls_encodedpoint(key_share_key
,
580 if (encodedlen
== 0) {
581 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE
, ERR_R_EC_LIB
);
582 EVP_PKEY_free(key_share_key
);
586 /* Create KeyShareEntry */
587 if (!WPACKET_put_bytes_u16(pkt
, curve_id
)
588 || !WPACKET_sub_memcpy_u16(pkt
, encodedPoint
, encodedlen
)) {
589 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
590 EVP_PKEY_free(key_share_key
);
591 OPENSSL_free(encodedPoint
);
596 * TODO(TLS1.3): When changing to send more than one key_share we're
597 * going to need to be able to save more than one EVP_PKEY. For now
598 * we reuse the existing tmp.pkey
600 s
->s3
->group_id
= curve_id
;
601 s
->s3
->tmp
.pkey
= key_share_key
;
603 OPENSSL_free(encodedPoint
);
606 if (!WPACKET_close(pkt
) || !WPACKET_close(pkt
)) {
607 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
615 #define F5_WORKAROUND_MIN_MSG_LEN 0xff
616 #define F5_WORKAROUND_MAX_MSG_LEN 0x200
618 int tls_construct_ctos_padding(SSL
*s
, WPACKET
*pkt
, X509
*x
, size_t chainidx
,
621 unsigned char *padbytes
;
624 if ((s
->options
& SSL_OP_TLSEXT_PADDING
) == 0)
628 * Add padding to workaround bugs in F5 terminators. See
629 * https://tools.ietf.org/html/draft-agl-tls-padding-03 NB: because this
630 * code calculates the length of all existing extensions it MUST always
633 if (!WPACKET_get_total_written(pkt
, &hlen
)) {
634 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING
, ERR_R_INTERNAL_ERROR
);
638 if (hlen
> F5_WORKAROUND_MIN_MSG_LEN
&& hlen
< F5_WORKAROUND_MAX_MSG_LEN
) {
639 /* Calculate the amond of padding we need to add */
640 hlen
= F5_WORKAROUND_MAX_MSG_LEN
- hlen
;
643 * Take off the size of extension header itself (2 bytes for type and
644 * 2 bytes for length bytes)
651 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_padding
)
652 || !WPACKET_sub_allocate_bytes_u16(pkt
, hlen
, &padbytes
)) {
653 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING
, ERR_R_INTERNAL_ERROR
);
656 memset(padbytes
, 0, hlen
);
663 * Construct the pre_shared_key extension
665 int tls_construct_ctos_psk(SSL
*s
, WPACKET
*pkt
, X509
*x
, size_t chainidx
,
668 #ifndef OPENSSL_NO_TLS1_3
669 uint32_t now
, ages
, agems
;
670 size_t hashsize
, binderoffset
, msglen
;
671 unsigned char *binder
= NULL
, *msgstart
= NULL
;
675 s
->session
->ext
.tick_identity
= TLSEXT_PSK_BAD_IDENTITY
;
678 * If this is an incompatible or new session then we have nothing to resume
679 * so don't add this extension.
681 if (s
->session
->ssl_version
!= TLS1_3_VERSION
682 || s
->session
->ext
.ticklen
== 0)
686 * Technically the C standard just says time() returns a time_t and says
687 * nothing about the encoding of that type. In practice most implementations
688 * follow POSIX which holds it as an integral type in seconds since epoch.
689 * We've already made the assumption that we can do this in multiple places
690 * in the code, so portability shouldn't be an issue.
692 now
= (uint32_t)time(NULL
);
693 ages
= now
- (uint32_t)s
->session
->time
;
695 if (s
->session
->ext
.tick_lifetime_hint
< ages
) {
696 /* Ticket is too old. Ignore it. */
701 * Calculate age in ms. We're just doing it to nearest second. Should be
704 agems
= ages
* (uint32_t)1000;
706 if (ages
!= 0 && agems
/ (uint32_t)1000 != ages
) {
708 * Overflow. Shouldn't happen unless this is a *really* old session. If
709 * so we just ignore it.
715 * Obfuscate the age. Overflow here is fine, this addition is supposed to
718 agems
+= s
->session
->ext
.tick_age_add
;
720 md
= ssl_cipher_get_handshake_md(s
->session
->cipher_id
);
722 /* Don't recognise this cipher so we can't use the session. Ignore it */
726 hashsize
= EVP_MD_size(md
);
728 /* Create the extension, but skip over the binder for now */
729 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_psk
)
730 || !WPACKET_start_sub_packet_u16(pkt
)
731 || !WPACKET_start_sub_packet_u16(pkt
)
732 || !WPACKET_sub_memcpy_u16(pkt
, s
->session
->ext
.tick
,
733 s
->session
->ext
.ticklen
)
734 || !WPACKET_put_bytes_u32(pkt
, agems
)
735 || !WPACKET_close(pkt
)
736 || !WPACKET_get_total_written(pkt
, &binderoffset
)
737 || !WPACKET_start_sub_packet_u16(pkt
)
738 || !WPACKET_sub_allocate_bytes_u8(pkt
, hashsize
, &binder
)
739 || !WPACKET_close(pkt
)
740 || !WPACKET_close(pkt
)
741 || !WPACKET_get_total_written(pkt
, &msglen
)
743 * We need to fill in all the sub-packet lengths now so we can
744 * calculate the HMAC of the message up to the binders
746 || !WPACKET_fill_lengths(pkt
)) {
747 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK
, ERR_R_INTERNAL_ERROR
);
751 msgstart
= WPACKET_get_curr(pkt
) - msglen
;
753 if (tls_psk_do_binder(s
, md
, msgstart
, binderoffset
, NULL
, binder
,
754 s
->session
, 1) != 1) {
755 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK
, ERR_R_INTERNAL_ERROR
);
759 s
->session
->ext
.tick_identity
= 0;
770 * Parse the server's renegotiation binding and abort if it's not right
772 int tls_parse_stoc_renegotiate(SSL
*s
, PACKET
*pkt
, X509
*x
, size_t chainidx
,
775 size_t expected_len
= s
->s3
->previous_client_finished_len
776 + s
->s3
->previous_server_finished_len
;
778 const unsigned char *data
;
780 /* Check for logic errors */
781 assert(expected_len
== 0 || s
->s3
->previous_client_finished_len
!= 0);
782 assert(expected_len
== 0 || s
->s3
->previous_server_finished_len
!= 0);
784 /* Parse the length byte */
785 if (!PACKET_get_1_len(pkt
, &ilen
)) {
786 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE
,
787 SSL_R_RENEGOTIATION_ENCODING_ERR
);
788 *al
= SSL_AD_ILLEGAL_PARAMETER
;
792 /* Consistency check */
793 if (PACKET_remaining(pkt
) != ilen
) {
794 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE
,
795 SSL_R_RENEGOTIATION_ENCODING_ERR
);
796 *al
= SSL_AD_ILLEGAL_PARAMETER
;
800 /* Check that the extension matches */
801 if (ilen
!= expected_len
) {
802 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE
,
803 SSL_R_RENEGOTIATION_MISMATCH
);
804 *al
= SSL_AD_HANDSHAKE_FAILURE
;
808 if (!PACKET_get_bytes(pkt
, &data
, s
->s3
->previous_client_finished_len
)
809 || memcmp(data
, s
->s3
->previous_client_finished
,
810 s
->s3
->previous_client_finished_len
) != 0) {
811 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE
,
812 SSL_R_RENEGOTIATION_MISMATCH
);
813 *al
= SSL_AD_HANDSHAKE_FAILURE
;
817 if (!PACKET_get_bytes(pkt
, &data
, s
->s3
->previous_server_finished_len
)
818 || memcmp(data
, s
->s3
->previous_server_finished
,
819 s
->s3
->previous_server_finished_len
) != 0) {
820 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE
,
821 SSL_R_RENEGOTIATION_MISMATCH
);
822 *al
= SSL_AD_ILLEGAL_PARAMETER
;
825 s
->s3
->send_connection_binding
= 1;
830 int tls_parse_stoc_server_name(SSL
*s
, PACKET
*pkt
, X509
*x
, size_t chainidx
,
833 if (s
->ext
.hostname
== NULL
|| PACKET_remaining(pkt
) > 0) {
834 *al
= SSL_AD_UNRECOGNIZED_NAME
;
839 if (s
->session
->ext
.hostname
!= NULL
) {
840 *al
= SSL_AD_INTERNAL_ERROR
;
843 s
->session
->ext
.hostname
= OPENSSL_strdup(s
->ext
.hostname
);
844 if (s
->session
->ext
.hostname
== NULL
) {
845 *al
= SSL_AD_INTERNAL_ERROR
;
853 #ifndef OPENSSL_NO_EC
854 int tls_parse_stoc_ec_pt_formats(SSL
*s
, PACKET
*pkt
, X509
*x
, size_t chainidx
,
857 unsigned int ecpointformats_len
;
858 PACKET ecptformatlist
;
860 if (!PACKET_as_length_prefixed_1(pkt
, &ecptformatlist
)) {
861 *al
= SSL_AD_DECODE_ERROR
;
865 ecpointformats_len
= PACKET_remaining(&ecptformatlist
);
866 s
->session
->ext
.ecpointformats_len
= 0;
868 OPENSSL_free(s
->session
->ext
.ecpointformats
);
869 s
->session
->ext
.ecpointformats
= OPENSSL_malloc(ecpointformats_len
);
870 if (s
->session
->ext
.ecpointformats
== NULL
) {
871 *al
= SSL_AD_INTERNAL_ERROR
;
875 s
->session
->ext
.ecpointformats_len
= ecpointformats_len
;
877 if (!PACKET_copy_bytes(&ecptformatlist
,
878 s
->session
->ext
.ecpointformats
,
879 ecpointformats_len
)) {
880 *al
= SSL_AD_INTERNAL_ERROR
;
889 int tls_parse_stoc_session_ticket(SSL
*s
, PACKET
*pkt
, X509
*x
, size_t chainidx
,
892 if (s
->ext
.session_ticket_cb
!= NULL
&&
893 !s
->ext
.session_ticket_cb(s
, PACKET_data(pkt
),
894 PACKET_remaining(pkt
),
895 s
->ext
.session_ticket_cb_arg
)) {
896 *al
= SSL_AD_INTERNAL_ERROR
;
900 if (!tls_use_ticket(s
) || PACKET_remaining(pkt
) > 0) {
901 *al
= SSL_AD_UNSUPPORTED_EXTENSION
;
905 s
->ext
.ticket_expected
= 1;
910 #ifndef OPENSSL_NO_OCSP
911 int tls_parse_stoc_status_request(SSL
*s
, PACKET
*pkt
, X509
*x
, size_t chainidx
,
915 * MUST only be sent if we've requested a status
916 * request message. In TLS <= 1.2 it must also be empty.
918 if (s
->ext
.status_type
== TLSEXT_STATUSTYPE_nothing
919 || (!SSL_IS_TLS13(s
) && PACKET_remaining(pkt
) > 0)) {
920 *al
= SSL_AD_UNSUPPORTED_EXTENSION
;
924 if (SSL_IS_TLS13(s
)) {
925 /* We only know how to handle this if it's for the first Certificate in
926 * the chain. We ignore any other repsonses.
930 return tls_process_cert_status_body(s
, pkt
, al
);
933 /* Set flag to expect CertificateStatus message */
934 s
->ext
.status_expected
= 1;
941 #ifndef OPENSSL_NO_CT
942 int tls_parse_stoc_sct(SSL
*s
, PACKET
*pkt
, X509
*x
, size_t chainidx
, int *al
)
945 * Only take it if we asked for it - i.e if there is no CT validation
946 * callback set, then a custom extension MAY be processing it, so we
947 * need to let control continue to flow to that.
949 if (s
->ct_validation_callback
!= NULL
) {
950 size_t size
= PACKET_remaining(pkt
);
952 /* Simply copy it off for later processing */
953 OPENSSL_free(s
->ext
.scts
);
956 s
->ext
.scts_len
= size
;
958 s
->ext
.scts
= OPENSSL_malloc(size
);
959 if (s
->ext
.scts
== NULL
960 || !PACKET_copy_bytes(pkt
, s
->ext
.scts
, size
)) {
961 *al
= SSL_AD_INTERNAL_ERROR
;
966 if (custom_ext_parse(s
, 0, TLSEXT_TYPE_signed_certificate_timestamp
,
967 PACKET_data(pkt
), PACKET_remaining(pkt
), al
) <= 0)
976 #ifndef OPENSSL_NO_NEXTPROTONEG
978 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
979 * elements of zero length are allowed and the set of elements must exactly
980 * fill the length of the block. Returns 1 on success or 0 on failure.
982 static int ssl_next_proto_validate(PACKET
*pkt
)
986 while (PACKET_remaining(pkt
)) {
987 if (!PACKET_get_length_prefixed_1(pkt
, &tmp_protocol
)
988 || PACKET_remaining(&tmp_protocol
) == 0)
995 int tls_parse_stoc_npn(SSL
*s
, PACKET
*pkt
, X509
*x
, size_t chainidx
, int *al
)
997 unsigned char *selected
;
998 unsigned char selected_len
;
1001 /* Check if we are in a renegotiation. If so ignore this extension */
1002 if (!SSL_IS_FIRST_HANDSHAKE(s
))
1005 /* We must have requested it. */
1006 if (s
->ctx
->ext
.npn_select_cb
== NULL
) {
1007 *al
= SSL_AD_UNSUPPORTED_EXTENSION
;
1011 /* The data must be valid */
1013 if (!ssl_next_proto_validate(&tmppkt
)) {
1014 *al
= SSL_AD_DECODE_ERROR
;
1017 if (s
->ctx
->ext
.npn_select_cb(s
, &selected
, &selected_len
,
1019 PACKET_remaining(pkt
),
1020 s
->ctx
->ext
.npn_select_cb_arg
) !=
1021 SSL_TLSEXT_ERR_OK
) {
1022 *al
= SSL_AD_INTERNAL_ERROR
;
1027 * Could be non-NULL if server has sent multiple NPN extensions in
1028 * a single Serverhello
1030 OPENSSL_free(s
->ext
.npn
);
1031 s
->ext
.npn
= OPENSSL_malloc(selected_len
);
1032 if (s
->ext
.npn
== NULL
) {
1033 *al
= SSL_AD_INTERNAL_ERROR
;
1037 memcpy(s
->ext
.npn
, selected
, selected_len
);
1038 s
->ext
.npn_len
= selected_len
;
1039 s
->s3
->npn_seen
= 1;
1045 int tls_parse_stoc_alpn(SSL
*s
, PACKET
*pkt
, X509
*x
, size_t chainidx
, int *al
)
1049 /* We must have requested it. */
1050 if (!s
->s3
->alpn_sent
) {
1051 *al
= SSL_AD_UNSUPPORTED_EXTENSION
;
1055 * The extension data consists of:
1056 * uint16 list_length
1057 * uint8 proto_length;
1058 * uint8 proto[proto_length];
1060 if (!PACKET_get_net_2_len(pkt
, &len
)
1061 || PACKET_remaining(pkt
) != len
|| !PACKET_get_1_len(pkt
, &len
)
1062 || PACKET_remaining(pkt
) != len
) {
1063 *al
= SSL_AD_DECODE_ERROR
;
1066 OPENSSL_free(s
->s3
->alpn_selected
);
1067 s
->s3
->alpn_selected
= OPENSSL_malloc(len
);
1068 if (s
->s3
->alpn_selected
== NULL
) {
1069 *al
= SSL_AD_INTERNAL_ERROR
;
1072 if (!PACKET_copy_bytes(pkt
, s
->s3
->alpn_selected
, len
)) {
1073 *al
= SSL_AD_DECODE_ERROR
;
1076 s
->s3
->alpn_selected_len
= len
;
1081 #ifndef OPENSSL_NO_SRTP
1082 int tls_parse_stoc_use_srtp(SSL
*s
, PACKET
*pkt
, X509
*x
, size_t chainidx
,
1085 unsigned int id
, ct
, mki
;
1087 STACK_OF(SRTP_PROTECTION_PROFILE
) *clnt
;
1088 SRTP_PROTECTION_PROFILE
*prof
;
1090 if (!PACKET_get_net_2(pkt
, &ct
) || ct
!= 2
1091 || !PACKET_get_net_2(pkt
, &id
)
1092 || !PACKET_get_1(pkt
, &mki
)
1093 || PACKET_remaining(pkt
) != 0) {
1094 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP
,
1095 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST
);
1096 *al
= SSL_AD_DECODE_ERROR
;
1101 /* Must be no MKI, since we never offer one */
1102 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP
, SSL_R_BAD_SRTP_MKI_VALUE
);
1103 *al
= SSL_AD_ILLEGAL_PARAMETER
;
1107 /* Throw an error if the server gave us an unsolicited extension */
1108 clnt
= SSL_get_srtp_profiles(s
);
1110 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP
, SSL_R_NO_SRTP_PROFILES
);
1111 *al
= SSL_AD_DECODE_ERROR
;
1116 * Check to see if the server gave us something we support (and
1117 * presumably offered)
1119 for (i
= 0; i
< sk_SRTP_PROTECTION_PROFILE_num(clnt
); i
++) {
1120 prof
= sk_SRTP_PROTECTION_PROFILE_value(clnt
, i
);
1122 if (prof
->id
== id
) {
1123 s
->srtp_profile
= prof
;
1129 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP
,
1130 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST
);
1131 *al
= SSL_AD_DECODE_ERROR
;
1136 int tls_parse_stoc_etm(SSL
*s
, PACKET
*pkt
, X509
*x
, size_t chainidx
, int *al
)
1138 /* Ignore if inappropriate ciphersuite */
1139 if (!(s
->options
& SSL_OP_NO_ENCRYPT_THEN_MAC
)
1140 && s
->s3
->tmp
.new_cipher
->algorithm_mac
!= SSL_AEAD
1141 && s
->s3
->tmp
.new_cipher
->algorithm_enc
!= SSL_RC4
)
1142 s
->s3
->flags
|= TLS1_FLAGS_ENCRYPT_THEN_MAC
;
1147 int tls_parse_stoc_ems(SSL
*s
, PACKET
*pkt
, X509
*x
, size_t chainidx
, int *al
)
1149 s
->s3
->flags
|= TLS1_FLAGS_RECEIVED_EXTMS
;
1151 s
->session
->flags
|= SSL_SESS_FLAG_EXTMS
;
1156 int tls_parse_stoc_key_share(SSL
*s
, PACKET
*pkt
, X509
*x
, size_t chainidx
,
1159 #ifndef OPENSSL_NO_TLS1_3
1160 unsigned int group_id
;
1162 EVP_PKEY
*ckey
= s
->s3
->tmp
.pkey
, *skey
= NULL
;
1166 *al
= SSL_AD_INTERNAL_ERROR
;
1167 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
1171 if (!PACKET_get_net_2(pkt
, &group_id
)) {
1172 *al
= SSL_AD_HANDSHAKE_FAILURE
;
1173 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, SSL_R_LENGTH_MISMATCH
);
1177 if (group_id
!= s
->s3
->group_id
) {
1179 * This isn't for the group that we sent in the original
1182 *al
= SSL_AD_HANDSHAKE_FAILURE
;
1183 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, SSL_R_BAD_KEY_SHARE
);
1187 if (!PACKET_as_length_prefixed_2(pkt
, &encoded_pt
)
1188 || PACKET_remaining(&encoded_pt
) == 0) {
1189 *al
= SSL_AD_DECODE_ERROR
;
1190 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, SSL_R_LENGTH_MISMATCH
);
1194 skey
= ssl_generate_pkey(ckey
);
1196 *al
= SSL_AD_INTERNAL_ERROR
;
1197 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, ERR_R_MALLOC_FAILURE
);
1200 if (!EVP_PKEY_set1_tls_encodedpoint(skey
, PACKET_data(&encoded_pt
),
1201 PACKET_remaining(&encoded_pt
))) {
1202 *al
= SSL_AD_DECODE_ERROR
;
1203 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, SSL_R_BAD_ECPOINT
);
1204 EVP_PKEY_free(skey
);
1208 if (ssl_derive(s
, ckey
, skey
, 1) == 0) {
1209 *al
= SSL_AD_INTERNAL_ERROR
;
1210 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
1211 EVP_PKEY_free(skey
);
1214 EVP_PKEY_free(skey
);
1220 int tls_parse_stoc_psk(SSL
*s
, PACKET
*pkt
, X509
*x
, size_t chainidx
, int *al
)
1222 #ifndef OPENSSL_NO_TLS1_3
1223 unsigned int identity
;
1225 if (!PACKET_get_net_2(pkt
, &identity
) || PACKET_remaining(pkt
) != 0) {
1226 *al
= SSL_AD_HANDSHAKE_FAILURE
;
1227 SSLerr(SSL_F_TLS_PARSE_STOC_PSK
, SSL_R_LENGTH_MISMATCH
);
1231 if (s
->session
->ext
.tick_identity
!= (int)identity
) {
1232 *al
= SSL_AD_HANDSHAKE_FAILURE
;
1233 SSLerr(SSL_F_TLS_PARSE_STOC_PSK
, SSL_R_BAD_PSK_IDENTITY
);