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
, int *al
)
17 /* Add RI if renegotiating */
21 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_renegotiate
)
22 || !WPACKET_start_sub_packet_u16(pkt
)
23 || !WPACKET_sub_memcpy_u8(pkt
, s
->s3
->previous_client_finished
,
24 s
->s3
->previous_client_finished_len
)
25 || !WPACKET_close(pkt
)) {
26 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_RENEGOTIATE
, ERR_R_INTERNAL_ERROR
);
33 int tls_construct_ctos_server_name(SSL
*s
, WPACKET
*pkt
, int *al
)
35 if (s
->tlsext_hostname
== NULL
)
38 /* Add TLS extension servername to the Client Hello message */
39 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_server_name
)
40 /* Sub-packet for server_name extension */
41 || !WPACKET_start_sub_packet_u16(pkt
)
42 /* Sub-packet for servername list (always 1 hostname)*/
43 || !WPACKET_start_sub_packet_u16(pkt
)
44 || !WPACKET_put_bytes_u8(pkt
, TLSEXT_NAMETYPE_host_name
)
45 || !WPACKET_sub_memcpy_u16(pkt
, s
->tlsext_hostname
,
46 strlen(s
->tlsext_hostname
))
47 || !WPACKET_close(pkt
)
48 || !WPACKET_close(pkt
)) {
49 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_SERVER_NAME
, ERR_R_INTERNAL_ERROR
);
56 #ifndef OPENSSL_NO_SRP
57 int tls_construct_ctos_srp(SSL
*s
, WPACKET
*pkt
, int *al
)
59 /* Add SRP username if there is one */
60 if (s
->srp_ctx
.login
== NULL
)
63 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_srp
)
64 /* Sub-packet for SRP extension */
65 || !WPACKET_start_sub_packet_u16(pkt
)
66 || !WPACKET_start_sub_packet_u8(pkt
)
67 /* login must not be zero...internal error if so */
68 || !WPACKET_set_flags(pkt
, WPACKET_FLAGS_NON_ZERO_LENGTH
)
69 || !WPACKET_memcpy(pkt
, s
->srp_ctx
.login
,
70 strlen(s
->srp_ctx
.login
))
71 || !WPACKET_close(pkt
)
72 || !WPACKET_close(pkt
)) {
73 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_SRP
, ERR_R_INTERNAL_ERROR
);
82 static int use_ecc(SSL
*s
)
85 unsigned long alg_k
, alg_a
;
86 STACK_OF(SSL_CIPHER
) *cipher_stack
= NULL
;
88 /* See if we support any ECC ciphersuites */
89 if (s
->version
== SSL3_VERSION
)
92 cipher_stack
= SSL_get_ciphers(s
);
93 end
= sk_SSL_CIPHER_num(cipher_stack
);
94 for (i
= 0; i
< end
; i
++) {
95 const SSL_CIPHER
*c
= sk_SSL_CIPHER_value(cipher_stack
, i
);
97 alg_k
= c
->algorithm_mkey
;
98 alg_a
= c
->algorithm_auth
;
99 if ((alg_k
& (SSL_kECDHE
| SSL_kECDHEPSK
))
100 || (alg_a
& SSL_aECDSA
)
101 || c
->min_tls
>= TLS1_3_VERSION
)
108 int tls_construct_ctos_ec_pt_formats(SSL
*s
, WPACKET
*pkt
, int *al
)
110 const unsigned char *pformats
;
116 /* Add TLS extension ECPointFormats to the ClientHello message */
117 tls1_get_formatlist(s
, &pformats
, &num_formats
);
119 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_ec_point_formats
)
120 /* Sub-packet for formats extension */
121 || !WPACKET_start_sub_packet_u16(pkt
)
122 || !WPACKET_sub_memcpy_u8(pkt
, pformats
, num_formats
)
123 || !WPACKET_close(pkt
)) {
124 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_EC_PT_FORMATS
, ERR_R_INTERNAL_ERROR
);
132 int tls_construct_ctos_supported_groups(SSL
*s
, WPACKET
*pkt
, int *al
)
134 const unsigned char *pcurves
= NULL
, *pcurvestmp
;
135 size_t num_curves
= 0, i
;
141 * Add TLS extension supported_groups to the ClientHello message
143 /* TODO(TLS1.3): Add support for DHE groups */
144 pcurves
= s
->tlsext_supportedgroupslist
;
145 if (!tls1_get_curvelist(s
, 0, &pcurves
, &num_curves
)) {
146 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_SUPPORTED_GROUPS
,
147 ERR_R_INTERNAL_ERROR
);
150 pcurvestmp
= pcurves
;
152 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_supported_groups
)
153 /* Sub-packet for supported_groups extension */
154 || !WPACKET_start_sub_packet_u16(pkt
)
155 || !WPACKET_start_sub_packet_u16(pkt
)) {
156 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_SUPPORTED_GROUPS
,
157 ERR_R_INTERNAL_ERROR
);
160 /* Copy curve ID if supported */
161 for (i
= 0; i
< num_curves
; i
++, pcurvestmp
+= 2) {
162 if (tls_curve_allowed(s
, pcurves
, SSL_SECOP_CURVE_SUPPORTED
)) {
163 if (!WPACKET_put_bytes_u8(pkt
, pcurvestmp
[0])
164 || !WPACKET_put_bytes_u8(pkt
, pcurvestmp
[1])) {
165 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_SUPPORTED_GROUPS
,
166 ERR_R_INTERNAL_ERROR
);
171 if (!WPACKET_close(pkt
) || !WPACKET_close(pkt
)) {
172 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_SUPPORTED_GROUPS
,
173 ERR_R_INTERNAL_ERROR
);
181 int tls_construct_ctos_session_ticket(SSL
*s
, WPACKET
*pkt
, int *al
)
185 if (!tls_use_ticket(s
))
188 if (!s
->new_session
&& s
->session
!= NULL
189 && s
->session
->tlsext_tick
!= NULL
) {
190 ticklen
= s
->session
->tlsext_ticklen
;
191 } else if (s
->session
&& s
->tlsext_session_ticket
!= NULL
192 && s
->tlsext_session_ticket
->data
!= NULL
) {
193 ticklen
= s
->tlsext_session_ticket
->length
;
194 s
->session
->tlsext_tick
= OPENSSL_malloc(ticklen
);
195 if (s
->session
->tlsext_tick
== NULL
) {
196 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_SESSION_TICKET
,
197 ERR_R_INTERNAL_ERROR
);
200 memcpy(s
->session
->tlsext_tick
,
201 s
->tlsext_session_ticket
->data
, ticklen
);
202 s
->session
->tlsext_ticklen
= ticklen
;
207 if (ticklen
== 0 && s
->tlsext_session_ticket
!= NULL
&&
208 s
->tlsext_session_ticket
->data
== NULL
)
211 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_session_ticket
)
212 || !WPACKET_sub_memcpy_u16(pkt
, s
->session
->tlsext_tick
, ticklen
)) {
213 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_SESSION_TICKET
, ERR_R_INTERNAL_ERROR
);
220 int tls_construct_ctos_sig_algs(SSL
*s
, WPACKET
*pkt
, int *al
)
223 const unsigned char *salg
;
225 if (!SSL_CLIENT_USE_SIGALGS(s
))
228 salglen
= tls12_get_psigalgs(s
, &salg
);
229 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_signature_algorithms
)
230 /* Sub-packet for sig-algs extension */
231 || !WPACKET_start_sub_packet_u16(pkt
)
232 /* Sub-packet for the actual list */
233 || !WPACKET_start_sub_packet_u16(pkt
)
234 || !tls12_copy_sigalgs(s
, pkt
, salg
, salglen
)
235 || !WPACKET_close(pkt
)
236 || !WPACKET_close(pkt
)) {
237 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_SIG_ALGS
, ERR_R_INTERNAL_ERROR
);
244 #ifndef OPENSSL_NO_OCSP
245 int tls_construct_ctos_status_request(SSL
*s
, WPACKET
*pkt
, int *al
)
249 if (s
->tlsext_status_type
!= TLSEXT_STATUSTYPE_ocsp
)
252 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_status_request
)
253 /* Sub-packet for status request extension */
254 || !WPACKET_start_sub_packet_u16(pkt
)
255 || !WPACKET_put_bytes_u8(pkt
, TLSEXT_STATUSTYPE_ocsp
)
256 /* Sub-packet for the ids */
257 || !WPACKET_start_sub_packet_u16(pkt
)) {
258 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_STATUS_REQUEST
, ERR_R_INTERNAL_ERROR
);
261 for (i
= 0; i
< sk_OCSP_RESPID_num(s
->tlsext_ocsp_ids
); i
++) {
262 unsigned char *idbytes
;
263 OCSP_RESPID
*id
= sk_OCSP_RESPID_value(s
->tlsext_ocsp_ids
, i
);
264 int idlen
= i2d_OCSP_RESPID(id
, NULL
);
267 /* Sub-packet for an individual id */
268 || !WPACKET_sub_allocate_bytes_u16(pkt
, idlen
, &idbytes
)
269 || i2d_OCSP_RESPID(id
, &idbytes
) != idlen
) {
270 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_STATUS_REQUEST
,
271 ERR_R_INTERNAL_ERROR
);
275 if (!WPACKET_close(pkt
)
276 || !WPACKET_start_sub_packet_u16(pkt
)) {
277 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_STATUS_REQUEST
, ERR_R_INTERNAL_ERROR
);
280 if (s
->tlsext_ocsp_exts
) {
281 unsigned char *extbytes
;
282 int extlen
= i2d_X509_EXTENSIONS(s
->tlsext_ocsp_exts
, NULL
);
285 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_STATUS_REQUEST
,
286 ERR_R_INTERNAL_ERROR
);
289 if (!WPACKET_allocate_bytes(pkt
, extlen
, &extbytes
)
290 || i2d_X509_EXTENSIONS(s
->tlsext_ocsp_exts
, &extbytes
)
292 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_STATUS_REQUEST
,
293 ERR_R_INTERNAL_ERROR
);
297 if (!WPACKET_close(pkt
) || !WPACKET_close(pkt
)) {
298 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_STATUS_REQUEST
, ERR_R_INTERNAL_ERROR
);
306 #ifndef OPENSSL_NO_NEXTPROTONEG
307 int tls_construct_ctos_npn(SSL
*s
, WPACKET
*pkt
, int *al
)
309 if (s
->ctx
->next_proto_select_cb
== NULL
|| s
->s3
->tmp
.finish_md_len
!= 0)
313 * The client advertises an empty extension to indicate its support
314 * for Next Protocol Negotiation
316 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_next_proto_neg
)
317 || !WPACKET_put_bytes_u16(pkt
, 0)) {
318 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_NPN
, ERR_R_INTERNAL_ERROR
);
326 int tls_construct_ctos_alpn(SSL
*s
, WPACKET
*pkt
, int *al
)
328 s
->s3
->alpn_sent
= 0;
331 * finish_md_len is non-zero during a renegotiation, so
332 * this avoids sending ALPN during the renegotiation
334 if (s
->alpn_client_proto_list
== NULL
|| s
->s3
->tmp
.finish_md_len
!= 0)
337 if (!WPACKET_put_bytes_u16(pkt
,
338 TLSEXT_TYPE_application_layer_protocol_negotiation
)
339 /* Sub-packet ALPN extension */
340 || !WPACKET_start_sub_packet_u16(pkt
)
341 || !WPACKET_sub_memcpy_u16(pkt
, s
->alpn_client_proto_list
,
342 s
->alpn_client_proto_list_len
)
343 || !WPACKET_close(pkt
)) {
344 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_ALPN
, ERR_R_INTERNAL_ERROR
);
347 s
->s3
->alpn_sent
= 1;
353 #ifndef OPENSSL_NO_SRTP
354 int tls_construct_ctos_use_srtp(SSL
*s
, WPACKET
*pkt
, int *al
)
356 STACK_OF(SRTP_PROTECTION_PROFILE
) *clnt
= SSL_get_srtp_profiles(s
);
362 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_use_srtp
)
363 /* Sub-packet for SRTP extension */
364 || !WPACKET_start_sub_packet_u16(pkt
)
365 /* Sub-packet for the protection profile list */
366 || !WPACKET_start_sub_packet_u16(pkt
)) {
367 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_USE_SRTP
, ERR_R_INTERNAL_ERROR
);
371 end
= sk_SRTP_PROTECTION_PROFILE_num(clnt
);
372 for (i
= 0; i
< end
; i
++) {
373 const SRTP_PROTECTION_PROFILE
*prof
=
374 sk_SRTP_PROTECTION_PROFILE_value(clnt
, i
);
376 if (prof
== NULL
|| !WPACKET_put_bytes_u16(pkt
, prof
->id
)) {
377 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_USE_SRTP
, ERR_R_INTERNAL_ERROR
);
381 if (!WPACKET_close(pkt
)
382 /* Add an empty use_mki value */
383 || !WPACKET_put_bytes_u8(pkt
, 0)
384 || !WPACKET_close(pkt
)) {
385 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_USE_SRTP
, ERR_R_INTERNAL_ERROR
);
393 int tls_construct_ctos_etm(SSL
*s
, WPACKET
*pkt
, int *al
)
395 if (s
->options
& SSL_OP_NO_ENCRYPT_THEN_MAC
)
398 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_encrypt_then_mac
)
399 || !WPACKET_put_bytes_u16(pkt
, 0)) {
400 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_ETM
, ERR_R_INTERNAL_ERROR
);
407 #ifndef OPENSSL_NO_CT
408 int tls_construct_ctos_sct(SSL
*s
, WPACKET
*pkt
, int *al
)
410 if (s
->ct_validation_callback
== NULL
)
413 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_signed_certificate_timestamp
)
414 || !WPACKET_put_bytes_u16(pkt
, 0)) {
415 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_SCT
, ERR_R_INTERNAL_ERROR
);
423 int tls_construct_ctos_ems(SSL
*s
, WPACKET
*pkt
, int *al
)
425 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_extended_master_secret
)
426 || !WPACKET_put_bytes_u16(pkt
, 0)) {
427 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_EMS
, ERR_R_INTERNAL_ERROR
);
434 int tls_construct_ctos_supported_versions(SSL
*s
, WPACKET
*pkt
, int *al
)
436 int currv
, min_version
, max_version
, reason
;
438 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_supported_versions
)
439 || !WPACKET_start_sub_packet_u16(pkt
)
440 || !WPACKET_start_sub_packet_u8(pkt
)) {
441 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_SUPPORTED_VERSIONS
,
442 ERR_R_INTERNAL_ERROR
);
446 reason
= ssl_get_client_min_max_version(s
, &min_version
, &max_version
);
448 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_SUPPORTED_VERSIONS
, reason
);
453 * TODO(TLS1.3): There is some discussion on the TLS list as to wheter
454 * we should include versions <TLS1.2. For the moment we do. To be
457 for (currv
= max_version
; currv
>= min_version
; currv
--) {
458 /* TODO(TLS1.3): Remove this first if clause prior to release!! */
459 if (currv
== TLS1_3_VERSION
) {
460 if (!WPACKET_put_bytes_u16(pkt
, TLS1_3_VERSION_DRAFT
)) {
461 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_SUPPORTED_VERSIONS
,
462 ERR_R_INTERNAL_ERROR
);
465 } else if (!WPACKET_put_bytes_u16(pkt
, currv
)) {
466 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_SUPPORTED_VERSIONS
,
467 ERR_R_INTERNAL_ERROR
);
471 if (!WPACKET_close(pkt
) || !WPACKET_close(pkt
)) {
472 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_SUPPORTED_VERSIONS
,
473 ERR_R_INTERNAL_ERROR
);
481 int tls_construct_ctos_key_share(SSL
*s
, WPACKET
*pkt
, int *al
)
483 size_t i
, sharessent
= 0, num_curves
= 0;
484 const unsigned char *pcurves
= NULL
;
486 /* key_share extension */
487 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_key_share
)
488 /* Extension data sub-packet */
489 || !WPACKET_start_sub_packet_u16(pkt
)
490 /* KeyShare list sub-packet */
491 || !WPACKET_start_sub_packet_u16(pkt
)) {
492 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
496 pcurves
= s
->tlsext_supportedgroupslist
;
497 if (!tls1_get_curvelist(s
, 0, &pcurves
, &num_curves
)) {
498 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
503 * TODO(TLS1.3): Make the number of key_shares sent configurable. For
506 for (i
= 0; i
< num_curves
&& sharessent
< 1; i
++, pcurves
+= 2) {
507 unsigned char *encodedPoint
= NULL
;
508 unsigned int curve_id
= 0;
509 EVP_PKEY
*key_share_key
= NULL
;
512 if (!tls_curve_allowed(s
, pcurves
, SSL_SECOP_CURVE_SUPPORTED
))
515 if (s
->s3
->tmp
.pkey
!= NULL
) {
516 /* Shouldn't happen! */
517 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
521 /* Generate a key for this key_share */
522 curve_id
= (pcurves
[0] << 8) | pcurves
[1];
523 key_share_key
= ssl_generate_pkey_curve(curve_id
);
524 if (key_share_key
== NULL
) {
525 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_KEY_SHARE
, ERR_R_EVP_LIB
);
529 /* Encode the public key. */
530 encodedlen
= EVP_PKEY_get1_tls_encodedpoint(key_share_key
,
532 if (encodedlen
== 0) {
533 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_KEY_SHARE
, ERR_R_EC_LIB
);
534 EVP_PKEY_free(key_share_key
);
538 /* Create KeyShareEntry */
539 if (!WPACKET_put_bytes_u16(pkt
, curve_id
)
540 || !WPACKET_sub_memcpy_u16(pkt
, encodedPoint
, encodedlen
)) {
541 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
542 EVP_PKEY_free(key_share_key
);
543 OPENSSL_free(encodedPoint
);
548 * TODO(TLS1.3): When changing to send more than one key_share we're
549 * going to need to be able to save more than one EVP_PKEY. For now
550 * we reuse the existing tmp.pkey
552 s
->s3
->group_id
= curve_id
;
553 s
->s3
->tmp
.pkey
= key_share_key
;
555 OPENSSL_free(encodedPoint
);
558 if (!WPACKET_close(pkt
) || !WPACKET_close(pkt
)) {
559 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
566 #define F5_WORKAROUND_MIN_MSG_LEN 0xff
567 #define F5_WORKAROUND_MAX_MSG_LEN 0x200
569 int tls_construct_ctos_padding(SSL
*s
, WPACKET
*pkt
, int *al
)
571 unsigned char *padbytes
;
574 if ((s
->options
& SSL_OP_TLSEXT_PADDING
) == 0)
578 * Add padding to workaround bugs in F5 terminators. See
579 * https://tools.ietf.org/html/draft-agl-tls-padding-03 NB: because this
580 * code calculates the length of all existing extensions it MUST always
583 if (!WPACKET_get_total_written(pkt
, &hlen
)) {
584 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_PADDING
, ERR_R_INTERNAL_ERROR
);
588 if (hlen
> F5_WORKAROUND_MIN_MSG_LEN
&& hlen
< F5_WORKAROUND_MAX_MSG_LEN
) {
589 /* Calculate the amond of padding we need to add */
590 hlen
= F5_WORKAROUND_MAX_MSG_LEN
- hlen
;
593 * Take off the size of extension header itself (2 bytes for type and
594 * 2 bytes for length bytes)
601 if (!WPACKET_put_bytes_u16(pkt
, TLSEXT_TYPE_padding
)
602 || !WPACKET_sub_allocate_bytes_u16(pkt
, hlen
, &padbytes
)) {
603 SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_PADDING
, ERR_R_INTERNAL_ERROR
);
606 memset(padbytes
, 0, hlen
);
613 * Parse the server's renegotiation binding and abort if it's not right
615 int tls_parse_stoc_renegotiate(SSL
*s
, PACKET
*pkt
, int *al
)
617 size_t expected_len
= s
->s3
->previous_client_finished_len
618 + s
->s3
->previous_server_finished_len
;
620 const unsigned char *data
;
622 /* Check for logic errors */
623 assert(expected_len
== 0 || s
->s3
->previous_client_finished_len
!= 0);
624 assert(expected_len
== 0 || s
->s3
->previous_server_finished_len
!= 0);
626 /* Parse the length byte */
627 if (!PACKET_get_1_len(pkt
, &ilen
)) {
628 SSLerr(SSL_F_TLS_PARSE_SERVER_RENEGOTIATE
,
629 SSL_R_RENEGOTIATION_ENCODING_ERR
);
630 *al
= SSL_AD_ILLEGAL_PARAMETER
;
634 /* Consistency check */
635 if (PACKET_remaining(pkt
) != ilen
) {
636 SSLerr(SSL_F_TLS_PARSE_SERVER_RENEGOTIATE
,
637 SSL_R_RENEGOTIATION_ENCODING_ERR
);
638 *al
= SSL_AD_ILLEGAL_PARAMETER
;
642 /* Check that the extension matches */
643 if (ilen
!= expected_len
) {
644 SSLerr(SSL_F_TLS_PARSE_SERVER_RENEGOTIATE
,
645 SSL_R_RENEGOTIATION_MISMATCH
);
646 *al
= SSL_AD_HANDSHAKE_FAILURE
;
650 if (!PACKET_get_bytes(pkt
, &data
, s
->s3
->previous_client_finished_len
)
651 || memcmp(data
, s
->s3
->previous_client_finished
,
652 s
->s3
->previous_client_finished_len
) != 0) {
653 SSLerr(SSL_F_TLS_PARSE_SERVER_RENEGOTIATE
,
654 SSL_R_RENEGOTIATION_MISMATCH
);
655 *al
= SSL_AD_HANDSHAKE_FAILURE
;
659 if (!PACKET_get_bytes(pkt
, &data
, s
->s3
->previous_server_finished_len
)
660 || memcmp(data
, s
->s3
->previous_server_finished
,
661 s
->s3
->previous_server_finished_len
) != 0) {
662 SSLerr(SSL_F_TLS_PARSE_SERVER_RENEGOTIATE
,
663 SSL_R_RENEGOTIATION_MISMATCH
);
664 *al
= SSL_AD_ILLEGAL_PARAMETER
;
667 s
->s3
->send_connection_binding
= 1;
672 int tls_parse_stoc_server_name(SSL
*s
, PACKET
*pkt
, int *al
)
674 if (s
->tlsext_hostname
== NULL
|| PACKET_remaining(pkt
) > 0) {
675 *al
= SSL_AD_UNRECOGNIZED_NAME
;
680 if (s
->session
->tlsext_hostname
!= NULL
) {
681 *al
= SSL_AD_INTERNAL_ERROR
;
684 s
->session
->tlsext_hostname
= OPENSSL_strdup(s
->tlsext_hostname
);
685 if (s
->session
->tlsext_hostname
== NULL
) {
686 *al
= SSL_AD_INTERNAL_ERROR
;
694 #ifndef OPENSSL_NO_EC
695 int tls_parse_stoc_ec_pt_formats(SSL
*s
, PACKET
*pkt
, int *al
)
697 unsigned int ecpointformatlist_length
;
698 PACKET ecptformatlist
;
700 if (!PACKET_as_length_prefixed_1(pkt
, &ecptformatlist
)) {
701 *al
= SSL_AD_DECODE_ERROR
;
705 ecpointformatlist_length
= PACKET_remaining(&ecptformatlist
);
706 s
->session
->tlsext_ecpointformatlist_length
= 0;
708 OPENSSL_free(s
->session
->tlsext_ecpointformatlist
);
709 s
->session
->tlsext_ecpointformatlist
=
710 OPENSSL_malloc(ecpointformatlist_length
);
711 if (s
->session
->tlsext_ecpointformatlist
== NULL
) {
712 *al
= SSL_AD_INTERNAL_ERROR
;
716 s
->session
->tlsext_ecpointformatlist_length
= ecpointformatlist_length
;
718 if (!PACKET_copy_bytes(&ecptformatlist
,
719 s
->session
->tlsext_ecpointformatlist
,
720 ecpointformatlist_length
)) {
721 *al
= SSL_AD_INTERNAL_ERROR
;
730 int tls_parse_stoc_session_ticket(SSL
*s
, PACKET
*pkt
, int *al
)
732 if (s
->tls_session_ticket_ext_cb
!= NULL
&&
733 !s
->tls_session_ticket_ext_cb(s
, PACKET_data(pkt
),
734 PACKET_remaining(pkt
),
735 s
->tls_session_ticket_ext_cb_arg
)) {
736 *al
= SSL_AD_INTERNAL_ERROR
;
740 if (!tls_use_ticket(s
) || PACKET_remaining(pkt
) > 0) {
741 *al
= SSL_AD_UNSUPPORTED_EXTENSION
;
745 s
->tlsext_ticket_expected
= 1;
750 #ifndef OPENSSL_NO_OCSP
751 int tls_parse_stoc_status_request(SSL
*s
, PACKET
*pkt
, int *al
)
754 * MUST be empty and only sent if we've requested a status
757 if (s
->tlsext_status_type
== TLSEXT_STATUSTYPE_nothing
758 || PACKET_remaining(pkt
) > 0) {
759 *al
= SSL_AD_UNSUPPORTED_EXTENSION
;
762 /* Set flag to expect CertificateStatus message */
763 s
->tlsext_status_expected
= 1;
770 #ifndef OPENSSL_NO_CT
771 int tls_parse_stoc_sct(SSL
*s
, PACKET
*pkt
, int *al
)
774 * Only take it if we asked for it - i.e if there is no CT validation
775 * callback set, then a custom extension MAY be processing it, so we
776 * need to let control continue to flow to that.
778 if (s
->ct_validation_callback
!= NULL
) {
779 size_t size
= PACKET_remaining(pkt
);
781 /* Simply copy it off for later processing */
782 OPENSSL_free(s
->tlsext_scts
);
783 s
->tlsext_scts
= NULL
;
785 s
->tlsext_scts_len
= size
;
787 s
->tlsext_scts
= OPENSSL_malloc(size
);
788 if (s
->tlsext_scts
== NULL
789 || !PACKET_copy_bytes(pkt
, s
->tlsext_scts
, size
)) {
790 *al
= SSL_AD_INTERNAL_ERROR
;
795 if (custom_ext_parse(s
, 0, TLSEXT_TYPE_signed_certificate_timestamp
,
796 PACKET_data(pkt
), PACKET_remaining(pkt
), al
) <= 0)
805 #ifndef OPENSSL_NO_NEXTPROTONEG
807 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
808 * elements of zero length are allowed and the set of elements must exactly
809 * fill the length of the block. Returns 1 on success or 0 on failure.
811 static int ssl_next_proto_validate(PACKET
*pkt
)
815 while (PACKET_remaining(pkt
)) {
816 if (!PACKET_get_length_prefixed_1(pkt
, &tmp_protocol
)
817 || PACKET_remaining(&tmp_protocol
) == 0)
824 int tls_parse_stoc_npn(SSL
*s
, PACKET
*pkt
, int *al
)
826 unsigned char *selected
;
827 unsigned char selected_len
;
830 /* Check if we are in a renegotiation. If so ignore this extension */
831 if (s
->s3
->tmp
.finish_md_len
!= 0)
834 /* We must have requested it. */
835 if (s
->ctx
->next_proto_select_cb
== NULL
) {
836 *al
= SSL_AD_UNSUPPORTED_EXTENSION
;
840 /* The data must be valid */
842 if (!ssl_next_proto_validate(&tmppkt
)) {
843 *al
= SSL_AD_DECODE_ERROR
;
846 if (s
->ctx
->next_proto_select_cb(s
, &selected
, &selected_len
,
848 PACKET_remaining(pkt
),
849 s
->ctx
->next_proto_select_cb_arg
) !=
851 *al
= SSL_AD_INTERNAL_ERROR
;
856 * Could be non-NULL if server has sent multiple NPN extensions in
857 * a single Serverhello
859 OPENSSL_free(s
->next_proto_negotiated
);
860 s
->next_proto_negotiated
= OPENSSL_malloc(selected_len
);
861 if (s
->next_proto_negotiated
== NULL
) {
862 *al
= SSL_AD_INTERNAL_ERROR
;
866 memcpy(s
->next_proto_negotiated
, selected
, selected_len
);
867 s
->next_proto_negotiated_len
= selected_len
;
868 s
->s3
->next_proto_neg_seen
= 1;
874 int tls_parse_stoc_alpn(SSL
*s
, PACKET
*pkt
, int *al
)
878 /* We must have requested it. */
879 if (!s
->s3
->alpn_sent
) {
880 *al
= SSL_AD_UNSUPPORTED_EXTENSION
;
884 * The extension data consists of:
886 * uint8 proto_length;
887 * uint8 proto[proto_length];
889 if (!PACKET_get_net_2_len(pkt
, &len
)
890 || PACKET_remaining(pkt
) != len
|| !PACKET_get_1_len(pkt
, &len
)
891 || PACKET_remaining(pkt
) != len
) {
892 *al
= SSL_AD_DECODE_ERROR
;
895 OPENSSL_free(s
->s3
->alpn_selected
);
896 s
->s3
->alpn_selected
= OPENSSL_malloc(len
);
897 if (s
->s3
->alpn_selected
== NULL
) {
898 *al
= SSL_AD_INTERNAL_ERROR
;
901 if (!PACKET_copy_bytes(pkt
, s
->s3
->alpn_selected
, len
)) {
902 *al
= SSL_AD_DECODE_ERROR
;
905 s
->s3
->alpn_selected_len
= len
;
910 #ifndef OPENSSL_NO_SRTP
911 int tls_parse_stoc_use_srtp(SSL
*s
, PACKET
*pkt
, int *al
)
913 unsigned int id
, ct
, mki
;
915 STACK_OF(SRTP_PROTECTION_PROFILE
) *clnt
;
916 SRTP_PROTECTION_PROFILE
*prof
;
918 if (!PACKET_get_net_2(pkt
, &ct
) || ct
!= 2
919 || !PACKET_get_net_2(pkt
, &id
)
920 || !PACKET_get_1(pkt
, &mki
)
921 || PACKET_remaining(pkt
) != 0) {
922 SSLerr(SSL_F_TLS_PARSE_SERVER_USE_SRTP
,
923 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST
);
924 *al
= SSL_AD_DECODE_ERROR
;
929 /* Must be no MKI, since we never offer one */
930 SSLerr(SSL_F_TLS_PARSE_SERVER_USE_SRTP
, SSL_R_BAD_SRTP_MKI_VALUE
);
931 *al
= SSL_AD_ILLEGAL_PARAMETER
;
935 /* Throw an error if the server gave us an unsolicited extension */
936 clnt
= SSL_get_srtp_profiles(s
);
938 SSLerr(SSL_F_TLS_PARSE_SERVER_USE_SRTP
, SSL_R_NO_SRTP_PROFILES
);
939 *al
= SSL_AD_DECODE_ERROR
;
944 * Check to see if the server gave us something we support (and
945 * presumably offered)
947 for (i
= 0; i
< sk_SRTP_PROTECTION_PROFILE_num(clnt
); i
++) {
948 prof
= sk_SRTP_PROTECTION_PROFILE_value(clnt
, i
);
950 if (prof
->id
== id
) {
951 s
->srtp_profile
= prof
;
957 SSLerr(SSL_F_TLS_PARSE_SERVER_USE_SRTP
,
958 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST
);
959 *al
= SSL_AD_DECODE_ERROR
;
964 int tls_parse_stoc_etm(SSL
*s
, PACKET
*pkt
, int *al
)
966 /* Ignore if inappropriate ciphersuite */
967 if (!(s
->options
& SSL_OP_NO_ENCRYPT_THEN_MAC
)
968 && s
->s3
->tmp
.new_cipher
->algorithm_mac
!= SSL_AEAD
969 && s
->s3
->tmp
.new_cipher
->algorithm_enc
!= SSL_RC4
)
970 s
->s3
->flags
|= TLS1_FLAGS_ENCRYPT_THEN_MAC
;
975 int tls_parse_stoc_ems(SSL
*s
, PACKET
*pkt
, int *al
)
977 s
->s3
->flags
|= TLS1_FLAGS_RECEIVED_EXTMS
;
979 s
->session
->flags
|= SSL_SESS_FLAG_EXTMS
;
984 int tls_parse_stoc_key_share(SSL
*s
, PACKET
*pkt
, int *al
)
986 unsigned int group_id
;
988 EVP_PKEY
*ckey
= s
->s3
->tmp
.pkey
, *skey
= NULL
;
992 *al
= SSL_AD_INTERNAL_ERROR
;
993 SSLerr(SSL_F_TLS_PARSE_SERVER_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
997 if (!PACKET_get_net_2(pkt
, &group_id
)) {
998 *al
= SSL_AD_HANDSHAKE_FAILURE
;
999 SSLerr(SSL_F_TLS_PARSE_SERVER_KEY_SHARE
, SSL_R_LENGTH_MISMATCH
);
1003 if (group_id
!= s
->s3
->group_id
) {
1005 * This isn't for the group that we sent in the original
1008 *al
= SSL_AD_HANDSHAKE_FAILURE
;
1009 SSLerr(SSL_F_TLS_PARSE_SERVER_KEY_SHARE
, SSL_R_BAD_KEY_SHARE
);
1013 if (!PACKET_as_length_prefixed_2(pkt
, &encoded_pt
)
1014 || PACKET_remaining(&encoded_pt
) == 0) {
1015 *al
= SSL_AD_DECODE_ERROR
;
1016 SSLerr(SSL_F_TLS_PARSE_SERVER_KEY_SHARE
, SSL_R_LENGTH_MISMATCH
);
1020 skey
= ssl_generate_pkey(ckey
);
1022 *al
= SSL_AD_INTERNAL_ERROR
;
1023 SSLerr(SSL_F_TLS_PARSE_SERVER_KEY_SHARE
, ERR_R_MALLOC_FAILURE
);
1026 if (!EVP_PKEY_set1_tls_encodedpoint(skey
, PACKET_data(&encoded_pt
),
1027 PACKET_remaining(&encoded_pt
))) {
1028 *al
= SSL_AD_DECODE_ERROR
;
1029 SSLerr(SSL_F_TLS_PARSE_SERVER_KEY_SHARE
, SSL_R_BAD_ECPOINT
);
1033 if (ssl_derive(s
, ckey
, skey
, 1) == 0) {
1034 *al
= SSL_AD_INTERNAL_ERROR
;
1035 SSLerr(SSL_F_TLS_PARSE_SERVER_KEY_SHARE
, ERR_R_INTERNAL_ERROR
);
1036 EVP_PKEY_free(skey
);
1039 EVP_PKEY_free(skey
);