2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
58 /* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
87 * 6. Redistributions of any form whatsoever must retain the following
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
113 #include <openssl/objects.h>
114 #include <openssl/evp.h>
115 #include <openssl/hmac.h>
116 #include "ssl_locl.h"
118 const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
120 #ifndef OPENSSL_NO_TLSEXT
121 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
122 const unsigned char *sess_id, int sesslen,
123 SSL_SESSION **psess);
126 SSL3_ENC_METHOD TLSv1_enc_data={
129 tls1_setup_key_block,
130 tls1_generate_master_secret,
131 tls1_change_cipher_state,
132 tls1_final_finish_mac,
133 TLS1_FINISH_MAC_LENGTH,
134 tls1_cert_verify_mac,
135 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
136 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
140 long tls1_default_timeout(void)
142 /* 2 hours, the 24 hours mentioned in the TLSv1 spec
143 * is way too long for http, the cache would over fill */
149 if (!ssl3_new(s)) return(0);
150 s->method->ssl_clear(s);
154 void tls1_free(SSL *s)
159 void tls1_clear(SSL *s)
162 s->version=TLS1_VERSION;
165 #ifndef OPENSSL_NO_EC
166 static int nid_list[] =
168 NID_sect163k1, /* sect163k1 (1) */
169 NID_sect163r1, /* sect163r1 (2) */
170 NID_sect163r2, /* sect163r2 (3) */
171 NID_sect193r1, /* sect193r1 (4) */
172 NID_sect193r2, /* sect193r2 (5) */
173 NID_sect233k1, /* sect233k1 (6) */
174 NID_sect233r1, /* sect233r1 (7) */
175 NID_sect239k1, /* sect239k1 (8) */
176 NID_sect283k1, /* sect283k1 (9) */
177 NID_sect283r1, /* sect283r1 (10) */
178 NID_sect409k1, /* sect409k1 (11) */
179 NID_sect409r1, /* sect409r1 (12) */
180 NID_sect571k1, /* sect571k1 (13) */
181 NID_sect571r1, /* sect571r1 (14) */
182 NID_secp160k1, /* secp160k1 (15) */
183 NID_secp160r1, /* secp160r1 (16) */
184 NID_secp160r2, /* secp160r2 (17) */
185 NID_secp192k1, /* secp192k1 (18) */
186 NID_X9_62_prime192v1, /* secp192r1 (19) */
187 NID_secp224k1, /* secp224k1 (20) */
188 NID_secp224r1, /* secp224r1 (21) */
189 NID_secp256k1, /* secp256k1 (22) */
190 NID_X9_62_prime256v1, /* secp256r1 (23) */
191 NID_secp384r1, /* secp384r1 (24) */
192 NID_secp521r1 /* secp521r1 (25) */
195 int tls1_ec_curve_id2nid(int curve_id)
197 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
198 if ((curve_id < 1) || (curve_id > sizeof(nid_list)/sizeof(nid_list[0]))) return 0;
199 return nid_list[curve_id-1];
202 int tls1_ec_nid2curve_id(int nid)
204 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
207 case NID_sect163k1: /* sect163k1 (1) */
209 case NID_sect163r1: /* sect163r1 (2) */
211 case NID_sect163r2: /* sect163r2 (3) */
213 case NID_sect193r1: /* sect193r1 (4) */
215 case NID_sect193r2: /* sect193r2 (5) */
217 case NID_sect233k1: /* sect233k1 (6) */
219 case NID_sect233r1: /* sect233r1 (7) */
221 case NID_sect239k1: /* sect239k1 (8) */
223 case NID_sect283k1: /* sect283k1 (9) */
225 case NID_sect283r1: /* sect283r1 (10) */
227 case NID_sect409k1: /* sect409k1 (11) */
229 case NID_sect409r1: /* sect409r1 (12) */
231 case NID_sect571k1: /* sect571k1 (13) */
233 case NID_sect571r1: /* sect571r1 (14) */
235 case NID_secp160k1: /* secp160k1 (15) */
237 case NID_secp160r1: /* secp160r1 (16) */
239 case NID_secp160r2: /* secp160r2 (17) */
241 case NID_secp192k1: /* secp192k1 (18) */
243 case NID_X9_62_prime192v1: /* secp192r1 (19) */
245 case NID_secp224k1: /* secp224k1 (20) */
247 case NID_secp224r1: /* secp224r1 (21) */
249 case NID_secp256k1: /* secp256k1 (22) */
251 case NID_X9_62_prime256v1: /* secp256r1 (23) */
253 case NID_secp384r1: /* secp384r1 (24) */
255 case NID_secp521r1: /* secp521r1 (25) */
261 #endif /* OPENSSL_NO_EC */
263 #ifndef OPENSSL_NO_TLSEXT
264 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
267 unsigned char *ret = p;
271 if (ret>=limit) return NULL; /* this really never occurs, but ... */
273 if (s->tlsext_hostname != NULL)
275 /* Add TLS extension servername to the Client Hello message */
276 unsigned long size_str;
279 /* check for enough space.
280 4 for the servername type and entension length
281 2 for servernamelist length
282 1 for the hostname type
283 2 for hostname length
287 if ((lenmax = limit - p - 9) < 0
288 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
291 /* extension type and length */
292 s2n(TLSEXT_TYPE_server_name,ret);
295 /* length of servername list */
298 /* hostname type, length and hostname */
299 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
301 memcpy(ret, s->tlsext_hostname, size_str);
305 #ifndef OPENSSL_NO_EC
306 if (s->tlsext_ecpointformatlist != NULL)
308 /* Add TLS extension ECPointFormats to the ClientHello message */
311 if ((lenmax = limit - p - 5) < 0) return NULL;
312 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
313 if (s->tlsext_ecpointformatlist_length > 255)
315 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
319 s2n(TLSEXT_TYPE_ec_point_formats,ret);
320 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
321 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
322 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
323 ret+=s->tlsext_ecpointformatlist_length;
325 if (s->tlsext_ellipticcurvelist != NULL)
327 /* Add TLS extension EllipticCurves to the ClientHello message */
330 if ((lenmax = limit - p - 6) < 0) return NULL;
331 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL;
332 if (s->tlsext_ellipticcurvelist_length > 65532)
334 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
338 s2n(TLSEXT_TYPE_elliptic_curves,ret);
339 s2n(s->tlsext_ellipticcurvelist_length + 2, ret);
341 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
342 * elliptic_curve_list, but the examples use two bytes.
343 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
344 * resolves this to two bytes.
346 s2n(s->tlsext_ellipticcurvelist_length, ret);
347 memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length);
348 ret+=s->tlsext_ellipticcurvelist_length;
350 #endif /* OPENSSL_NO_EC */
352 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
355 if (s->session && s->session->tlsext_tick)
356 ticklen = s->session->tlsext_ticklen;
359 /* Check for enough room 2 for extension type, 2 for len
362 if (limit - p - 4 - ticklen < 0)
364 s2n(TLSEXT_TYPE_session_ticket,ret);
368 memcpy(ret, s->session->tlsext_tick, ticklen);
373 if ((extdatalen = ret-p-2)== 0)
380 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
383 unsigned char *ret = p;
386 if (ret>=limit) return NULL; /* this really never occurs, but ... */
388 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
390 if (limit - p - 4 < 0) return NULL;
392 s2n(TLSEXT_TYPE_server_name,ret);
395 #ifndef OPENSSL_NO_EC
396 if (s->tlsext_ecpointformatlist != NULL)
398 /* Add TLS extension ECPointFormats to the ServerHello message */
401 if ((lenmax = limit - p - 5) < 0) return NULL;
402 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
403 if (s->tlsext_ecpointformatlist_length > 255)
405 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
409 s2n(TLSEXT_TYPE_ec_point_formats,ret);
410 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
411 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
412 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
413 ret+=s->tlsext_ecpointformatlist_length;
416 /* Currently the server should not respond with a SupportedCurves extension */
417 #endif /* OPENSSL_NO_EC */
419 if (s->tlsext_ticket_expected
420 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
422 if (limit - p - 4 < 0) return NULL;
423 s2n(TLSEXT_TYPE_session_ticket,ret);
427 if ((extdatalen = ret-p-2)== 0)
434 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
439 unsigned char *data = *p;
440 s->servername_done = 0;
446 if (data > (d+n-len))
449 while (data <= (d+n-4))
454 if (data+size > (d+n))
457 if (s->tlsext_debug_cb)
458 s->tlsext_debug_cb(s, 0, type, data, size,
459 s->tlsext_debug_arg);
460 /* The servername extension is treated as follows:
462 - Only the hostname type is supported with a maximum length of 255.
463 - The servername is rejected if too long or if it contains zeros,
464 in which case an fatal alert is generated.
465 - The servername field is maintained together with the session cache.
466 - When a session is resumed, the servername call back invoked in order
467 to allow the application to position itself to the right context.
468 - The servername is acknowledged if it is new for a session or when
469 it is identical to a previously used for the same session.
470 Applications can control the behaviour. They can at any time
471 set a 'desirable' servername for a new SSL object. This can be the
472 case for example with HTTPS when a Host: header field is received and
473 a renegotiation is requested. In this case, a possible servername
474 presented in the new client hello is only acknowledged if it matches
475 the value of the Host: field.
476 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
477 if they provide for changing an explicit servername context for the session,
478 i.e. when the session has been established with a servername extension.
479 - On session reconnect, the servername extension may be absent.
483 if (type == TLSEXT_TYPE_server_name)
485 unsigned char *sdata;
491 *al = SSL_AD_DECODE_ERROR;
498 *al = SSL_AD_DECODE_ERROR;
505 servname_type = *(sdata++);
511 *al = SSL_AD_DECODE_ERROR;
514 if (s->servername_done == 0)
515 switch (servname_type)
517 case TLSEXT_NAMETYPE_host_name:
518 if (s->session->tlsext_hostname == NULL)
520 if (len > TLSEXT_MAXLEN_host_name ||
521 ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL))
523 *al = TLS1_AD_UNRECOGNIZED_NAME;
526 memcpy(s->session->tlsext_hostname, sdata, len);
527 s->session->tlsext_hostname[len]='\0';
528 if (strlen(s->session->tlsext_hostname) != len) {
529 OPENSSL_free(s->session->tlsext_hostname);
530 *al = TLS1_AD_UNRECOGNIZED_NAME;
533 s->servername_done = 1;
537 s->servername_done = strlen(s->session->tlsext_hostname) == len
538 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
550 *al = SSL_AD_DECODE_ERROR;
556 #ifndef OPENSSL_NO_EC
557 else if (type == TLSEXT_TYPE_ec_point_formats)
559 unsigned char *sdata = data;
560 int ecpointformatlist_length = *(sdata++);
562 if (ecpointformatlist_length != size - 1)
564 *al = TLS1_AD_DECODE_ERROR;
567 s->session->tlsext_ecpointformatlist_length = 0;
568 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
569 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
571 *al = TLS1_AD_INTERNAL_ERROR;
574 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
575 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
577 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
578 sdata = s->session->tlsext_ecpointformatlist;
579 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
580 fprintf(stderr,"%i ",*(sdata++));
581 fprintf(stderr,"\n");
584 else if (type == TLSEXT_TYPE_elliptic_curves)
586 unsigned char *sdata = data;
587 int ellipticcurvelist_length = (*(sdata++) << 8);
588 ellipticcurvelist_length += (*(sdata++));
590 if (ellipticcurvelist_length != size - 2)
592 *al = TLS1_AD_DECODE_ERROR;
595 s->session->tlsext_ellipticcurvelist_length = 0;
596 if (s->session->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->session->tlsext_ellipticcurvelist);
597 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
599 *al = TLS1_AD_INTERNAL_ERROR;
602 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
603 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
605 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
606 sdata = s->session->tlsext_ellipticcurvelist;
607 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
608 fprintf(stderr,"%i ",*(sdata++));
609 fprintf(stderr,"\n");
612 #endif /* OPENSSL_NO_EC */
613 /* session ticket processed earlier */
621 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
626 unsigned char *data = *p;
628 int tlsext_servername = 0;
635 while(data <= (d+n-4))
640 if (data+size > (d+n))
643 if (s->tlsext_debug_cb)
644 s->tlsext_debug_cb(s, 1, type, data, size,
645 s->tlsext_debug_arg);
647 if (type == TLSEXT_TYPE_server_name)
649 if (s->tlsext_hostname == NULL || size > 0)
651 *al = TLS1_AD_UNRECOGNIZED_NAME;
654 tlsext_servername = 1;
657 #ifndef OPENSSL_NO_EC
658 else if (type == TLSEXT_TYPE_ec_point_formats)
660 unsigned char *sdata = data;
661 int ecpointformatlist_length = *(sdata++);
663 if (ecpointformatlist_length != size - 1)
665 *al = TLS1_AD_DECODE_ERROR;
668 s->session->tlsext_ecpointformatlist_length = 0;
669 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
670 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
672 *al = TLS1_AD_INTERNAL_ERROR;
675 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
676 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
678 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
679 sdata = s->session->tlsext_ecpointformatlist;
680 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
681 fprintf(stderr,"%i ",*(sdata++));
682 fprintf(stderr,"\n");
685 #endif /* OPENSSL_NO_EC */
687 else if (type == TLSEXT_TYPE_session_ticket)
689 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
692 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
695 s->tlsext_ticket_expected = 1;
702 *al = SSL_AD_DECODE_ERROR;
706 if (!s->hit && tlsext_servername == 1)
708 if (s->tlsext_hostname)
710 if (s->session->tlsext_hostname == NULL)
712 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
713 if (!s->session->tlsext_hostname)
715 *al = SSL_AD_UNRECOGNIZED_NAME;
721 *al = SSL_AD_DECODE_ERROR;
732 int ssl_prepare_clienthello_tlsext(SSL *s)
734 #ifndef OPENSSL_NO_EC
735 /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats
736 * and elliptic curves we support.
741 unsigned long alg_k, alg_a;
742 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
744 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
746 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
748 alg_k = c->algorithm_mkey;
749 alg_a = c->algorithm_auth;
750 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA)))
756 using_ecc = using_ecc && (s->version == TLS1_VERSION);
759 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
760 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
762 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
765 s->tlsext_ecpointformatlist_length = 3;
766 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
767 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
768 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
770 /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */
771 if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist);
772 s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2;
773 if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL)
775 s->tlsext_ellipticcurvelist_length = 0;
776 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
779 for (i = 1, j = s->tlsext_ellipticcurvelist; i <= sizeof(nid_list)/sizeof(nid_list[0]); i++)
782 #endif /* OPENSSL_NO_EC */
786 int ssl_prepare_serverhello_tlsext(SSL *s)
788 #ifndef OPENSSL_NO_EC
789 /* If we are server and using an ECC cipher suite, send the point formats we support
790 * if the client sent us an ECPointsFormat extension. Note that the server is not
791 * supposed to send an EllipticCurves extension.
794 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
795 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
796 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
797 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
801 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
802 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
804 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
807 s->tlsext_ecpointformatlist_length = 3;
808 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
809 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
810 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
812 #endif /* OPENSSL_NO_EC */
816 int ssl_check_clienthello_tlsext(SSL *s)
818 int ret=SSL_TLSEXT_ERR_NOACK;
819 int al = SSL_AD_UNRECOGNIZED_NAME;
821 #ifndef OPENSSL_NO_EC
822 /* The handling of the ECPointFormats extension is done elsewhere, namely in
823 * ssl3_choose_cipher in s3_lib.c.
825 /* The handling of the EllipticCurves extension is done elsewhere, namely in
826 * ssl3_choose_cipher in s3_lib.c.
830 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
831 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
832 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
833 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
837 case SSL_TLSEXT_ERR_ALERT_FATAL:
838 ssl3_send_alert(s,SSL3_AL_FATAL,al);
841 case SSL_TLSEXT_ERR_ALERT_WARNING:
842 ssl3_send_alert(s,SSL3_AL_WARNING,al);
845 case SSL_TLSEXT_ERR_NOACK:
846 s->servername_done=0;
852 int ssl_check_serverhello_tlsext(SSL *s)
854 int ret=SSL_TLSEXT_ERR_NOACK;
855 int al = SSL_AD_UNRECOGNIZED_NAME;
857 #ifndef OPENSSL_NO_EC
858 /* If we are client and using an elliptic curve cryptography cipher suite, then server
859 * must return a an EC point formats lists containing uncompressed.
861 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
862 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
863 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
864 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
866 /* we are using an ECC cipher */
869 int found_uncompressed = 0;
870 if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0))
872 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
875 list = s->session->tlsext_ecpointformatlist;
876 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
878 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
880 found_uncompressed = 1;
884 if (!found_uncompressed)
886 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
890 ret = SSL_TLSEXT_ERR_OK;
891 #endif /* OPENSSL_NO_EC */
893 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
894 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
895 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
896 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
900 case SSL_TLSEXT_ERR_ALERT_FATAL:
901 ssl3_send_alert(s,SSL3_AL_FATAL,al);
904 case SSL_TLSEXT_ERR_ALERT_WARNING:
905 ssl3_send_alert(s,SSL3_AL_WARNING,al);
908 case SSL_TLSEXT_ERR_NOACK:
909 s->servername_done=0;
915 /* Since the server cache lookup is done early on in the processing of client
916 * hello and other operations depend on the result we need to handle any TLS
917 * session ticket extension at the same time.
920 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
921 const unsigned char *limit, SSL_SESSION **ret)
923 /* Point after session ID in client hello */
924 const unsigned char *p = session_id + len;
926 if ((s->version <= SSL3_VERSION) || !limit)
930 /* Skip past cipher list */
935 /* Skip past compression algorithm list */
940 /* Now at start of extensions */
941 if ((p + 2) >= limit)
944 while ((p + 4) <= limit)
946 unsigned short type, size;
949 if (p + size > limit)
951 if (type == TLSEXT_TYPE_session_ticket)
953 /* If tickets disabled indicate cache miss which will
954 * trigger a full handshake
956 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
958 /* If zero length not client will accept a ticket
959 * and indicate cache miss to trigger full handshake
963 s->tlsext_ticket_expected = 1;
964 return 0; /* Cache miss */
966 return tls_decrypt_ticket(s, p, size, session_id, len,
974 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
975 const unsigned char *sess_id, int sesslen,
980 const unsigned char *p;
982 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
985 /* Attempt to process session ticket, first conduct sanity and
986 * integrity checks on ticket.
988 mlen = EVP_MD_size(tlsext_tick_md());
990 /* Need at least keyname + iv + some encrypted data */
993 /* Check key name matches */
994 if (memcmp(etick, s->ctx->tlsext_tick_key_name, 16))
996 /* Check HMAC of encrypted ticket */
997 HMAC_CTX_init(&hctx);
998 HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16,
999 tlsext_tick_md(), NULL);
1000 HMAC_Update(&hctx, etick, eticklen);
1001 HMAC_Final(&hctx, tick_hmac, NULL);
1002 HMAC_CTX_cleanup(&hctx);
1003 if (memcmp(tick_hmac, etick + eticklen, mlen))
1005 /* Set p to start of IV */
1007 EVP_CIPHER_CTX_init(&ctx);
1008 /* Attempt to decrypt session data */
1009 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1010 s->ctx->tlsext_tick_aes_key, p);
1011 /* Move p after IV to start of encrypted ticket, update length */
1014 sdec = OPENSSL_malloc(eticklen);
1017 EVP_CIPHER_CTX_cleanup(&ctx);
1020 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
1021 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
1024 EVP_CIPHER_CTX_cleanup(&ctx);
1027 sess = d2i_SSL_SESSION(NULL, &p, slen);
1031 /* The session ID if non-empty is used by some clients to
1032 * detect that the ticket has been accepted. So we copy it to
1033 * the session structure. If it is empty set length to zero
1034 * as required by standard.
1037 memcpy(sess->session_id, sess_id, sesslen);
1038 sess->session_id_length = sesslen;
1042 /* If session decrypt failure indicate a cache miss and set state to
1046 s->tlsext_ticket_expected = 1;