extensions_clnt.c 44.7 KB
Newer Older
1 2 3 4 5 6 7 8 9 10
/*
 * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <assert.h>
11
#include <openssl/ocsp.h>
12 13 14
#include "../ssl_locl.h"
#include "statem_locl.h"

15 16
int tls_construct_ctos_renegotiate(SSL *s, WPACKET *pkt, unsigned int context,
                                   X509 *x, size_t chainidx, int *al)
17 18 19 20 21 22 23 24 25 26
{
    /* Add RI if renegotiating */
    if (!s->renegotiate)
        return 1;

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_renegotiate)
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_sub_memcpy_u8(pkt, s->s3->previous_client_finished,
                               s->s3->previous_client_finished_len)
            || !WPACKET_close(pkt)) {
M
Matt Caswell 已提交
27
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_RENEGOTIATE, ERR_R_INTERNAL_ERROR);
28 29 30 31 32 33
        return 0;
    }

    return 1;
}

34 35
int tls_construct_ctos_server_name(SSL *s, WPACKET *pkt, unsigned int context,
                                   X509 *x, size_t chainidx, int *al)
36
{
R
Rich Salz 已提交
37
    if (s->ext.hostname == NULL)
38 39 40 41 42 43 44 45 46
        return 1;

    /* Add TLS extension servername to the Client Hello message */
    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_server_name)
               /* Sub-packet for server_name extension */
            || !WPACKET_start_sub_packet_u16(pkt)
               /* Sub-packet for servername list (always 1 hostname)*/
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_put_bytes_u8(pkt, TLSEXT_NAMETYPE_host_name)
R
Rich Salz 已提交
47 48
            || !WPACKET_sub_memcpy_u16(pkt, s->ext.hostname,
                                       strlen(s->ext.hostname))
49 50
            || !WPACKET_close(pkt)
            || !WPACKET_close(pkt)) {
M
Matt Caswell 已提交
51
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SERVER_NAME, ERR_R_INTERNAL_ERROR);
52 53 54 55 56 57 58
        return 0;
    }

    return 1;
}

#ifndef OPENSSL_NO_SRP
59 60
int tls_construct_ctos_srp(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
                           size_t chainidx, int *al)
61 62 63 64 65 66 67 68 69 70 71 72 73 74 75
{
    /* Add SRP username if there is one */
    if (s->srp_ctx.login == NULL)
        return 1;

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_srp)
               /* Sub-packet for SRP extension */
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_start_sub_packet_u8(pkt)
               /* login must not be zero...internal error if so */
            || !WPACKET_set_flags(pkt, WPACKET_FLAGS_NON_ZERO_LENGTH)
            || !WPACKET_memcpy(pkt, s->srp_ctx.login,
                               strlen(s->srp_ctx.login))
            || !WPACKET_close(pkt)
            || !WPACKET_close(pkt)) {
M
Matt Caswell 已提交
76
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SRP, ERR_R_INTERNAL_ERROR);
77 78 79 80 81 82 83 84 85 86
        return 0;
    }

    return 1;
}
#endif

#ifndef OPENSSL_NO_EC
static int use_ecc(SSL *s)
{
87
    int i, end;
88 89 90 91 92 93 94 95
    unsigned long alg_k, alg_a;
    STACK_OF(SSL_CIPHER) *cipher_stack = NULL;

    /* See if we support any ECC ciphersuites */
    if (s->version == SSL3_VERSION)
        return 0;

    cipher_stack = SSL_get_ciphers(s);
96 97
    end = sk_SSL_CIPHER_num(cipher_stack);
    for (i = 0; i < end; i++) {
98 99 100 101 102
        const SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);

        alg_k = c->algorithm_mkey;
        alg_a = c->algorithm_auth;
        if ((alg_k & (SSL_kECDHE | SSL_kECDHEPSK))
103 104
                || (alg_a & SSL_aECDSA)
                || c->min_tls >= TLS1_3_VERSION)
B
Benjamin Kaduk 已提交
105
            return 1;
106 107
    }

B
Benjamin Kaduk 已提交
108
    return 0;
109 110
}

111 112
int tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt, unsigned int context,
                                     X509 *x, size_t chainidx, int *al)
113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
{
    const unsigned char *pformats;
    size_t num_formats;

    if (!use_ecc(s))
        return 1;

    /* Add TLS extension ECPointFormats to the ClientHello message */
    tls1_get_formatlist(s, &pformats, &num_formats);

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats)
               /* Sub-packet for formats extension */
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_sub_memcpy_u8(pkt, pformats, num_formats)
            || !WPACKET_close(pkt)) {
M
Matt Caswell 已提交
128
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
129 130 131 132 133 134
        return 0;
    }

    return 1;
}

135 136
int tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt,
                                        unsigned int context, X509 *x,
137
                                        size_t chainidx, int *al)
138 139 140 141 142 143 144 145 146 147 148 149
{
    const unsigned char *pcurves = NULL, *pcurvestmp;
    size_t num_curves = 0, i;

    if (!use_ecc(s))
        return 1;

    /*
     * Add TLS extension supported_groups to the ClientHello message
     */
    /* TODO(TLS1.3): Add support for DHE groups */
    if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
M
Matt Caswell 已提交
150
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
151 152 153 154 155 156 157 158 159
               ERR_R_INTERNAL_ERROR);
        return 0;
    }
    pcurvestmp = pcurves;

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_groups)
               /* Sub-packet for supported_groups extension */
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_start_sub_packet_u16(pkt)) {
M
Matt Caswell 已提交
160
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
161 162 163 164 165
               ERR_R_INTERNAL_ERROR);
        return 0;
    }
    /* Copy curve ID if supported */
    for (i = 0; i < num_curves; i++, pcurvestmp += 2) {
166
        if (tls_curve_allowed(s, pcurvestmp, SSL_SECOP_CURVE_SUPPORTED)) {
167 168
            if (!WPACKET_put_bytes_u8(pkt, pcurvestmp[0])
                || !WPACKET_put_bytes_u8(pkt, pcurvestmp[1])) {
M
Matt Caswell 已提交
169
                    SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
170 171 172 173 174 175
                           ERR_R_INTERNAL_ERROR);
                    return 0;
                }
        }
    }
    if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
M
Matt Caswell 已提交
176
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
177 178 179 180 181 182 183 184
               ERR_R_INTERNAL_ERROR);
        return 0;
    }

    return 1;
}
#endif

185 186
int tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt,
                                      unsigned int context, X509 *x,
187
                                      size_t chainidx, int *al)
188 189 190 191 192 193 194
{
    size_t ticklen;

    if (!tls_use_ticket(s))
        return 1;

    if (!s->new_session && s->session != NULL
195 196
            && s->session->ext.tick != NULL
            && s->session->ssl_version != TLS1_3_VERSION) {
R
Rich Salz 已提交
197 198 199 200 201 202
        ticklen = s->session->ext.ticklen;
    } else if (s->session && s->ext.session_ticket != NULL
               && s->ext.session_ticket->data != NULL) {
        ticklen = s->ext.session_ticket->length;
        s->session->ext.tick = OPENSSL_malloc(ticklen);
        if (s->session->ext.tick == NULL) {
M
Matt Caswell 已提交
203
            SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET,
204 205 206
                   ERR_R_INTERNAL_ERROR);
            return 0;
        }
R
Rich Salz 已提交
207 208 209
        memcpy(s->session->ext.tick,
               s->ext.session_ticket->data, ticklen);
        s->session->ext.ticklen = ticklen;
210 211 212 213
    } else {
        ticklen = 0;
    }

R
Rich Salz 已提交
214 215
    if (ticklen == 0 && s->ext.session_ticket != NULL &&
            s->ext.session_ticket->data == NULL)
216 217 218
        return 1;

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket)
R
Rich Salz 已提交
219
            || !WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick, ticklen)) {
M
Matt Caswell 已提交
220
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
221 222 223 224 225 226
        return 0;
    }

    return 1;
}

227 228
int tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt, unsigned int context,
                                X509 *x, size_t chainidx, int *al)
229 230
{
    size_t salglen;
231
    const uint16_t *salg;
232 233 234 235

    if (!SSL_CLIENT_USE_SIGALGS(s))
        return 1;

236
    salglen = tls12_get_psigalgs(s, 1, &salg);
237 238 239 240 241 242 243 244
    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signature_algorithms)
               /* Sub-packet for sig-algs extension */
            || !WPACKET_start_sub_packet_u16(pkt)
               /* Sub-packet for the actual list */
            || !WPACKET_start_sub_packet_u16(pkt)
            || !tls12_copy_sigalgs(s, pkt, salg, salglen)
            || !WPACKET_close(pkt)
            || !WPACKET_close(pkt)) {
M
Matt Caswell 已提交
245
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SIG_ALGS, ERR_R_INTERNAL_ERROR);
246 247 248 249 250 251 252
        return 0;
    }

    return 1;
}

#ifndef OPENSSL_NO_OCSP
253 254
int tls_construct_ctos_status_request(SSL *s, WPACKET *pkt,
                                      unsigned int context, X509 *x,
255
                                      size_t chainidx, int *al)
256 257 258
{
    int i;

259 260 261 262
    /* This extension isn't defined for client Certificates */
    if (x != NULL)
        return 1;

R
Rich Salz 已提交
263
    if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp)
264 265 266 267 268 269 270 271
        return 1;

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request)
               /* Sub-packet for status request extension */
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_put_bytes_u8(pkt, TLSEXT_STATUSTYPE_ocsp)
               /* Sub-packet for the ids */
            || !WPACKET_start_sub_packet_u16(pkt)) {
M
Matt Caswell 已提交
272
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
273 274
        return 0;
    }
R
Rich Salz 已提交
275
    for (i = 0; i < sk_OCSP_RESPID_num(s->ext.ocsp.ids); i++) {
276
        unsigned char *idbytes;
R
Rich Salz 已提交
277
        OCSP_RESPID *id = sk_OCSP_RESPID_value(s->ext.ocsp.ids, i);
278
        int idlen = i2d_OCSP_RESPID(id, NULL);
279 280 281 282 283

        if (idlen <= 0
                   /* Sub-packet for an individual id */
                || !WPACKET_sub_allocate_bytes_u16(pkt, idlen, &idbytes)
                || i2d_OCSP_RESPID(id, &idbytes) != idlen) {
M
Matt Caswell 已提交
284
            SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
285 286 287 288 289 290
                   ERR_R_INTERNAL_ERROR);
            return 0;
        }
    }
    if (!WPACKET_close(pkt)
            || !WPACKET_start_sub_packet_u16(pkt)) {
M
Matt Caswell 已提交
291
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
292 293
        return 0;
    }
R
Rich Salz 已提交
294
    if (s->ext.ocsp.exts) {
295
        unsigned char *extbytes;
R
Rich Salz 已提交
296
        int extlen = i2d_X509_EXTENSIONS(s->ext.ocsp.exts, NULL);
297 298

        if (extlen < 0) {
M
Matt Caswell 已提交
299
            SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
300 301 302 303
                   ERR_R_INTERNAL_ERROR);
            return 0;
        }
        if (!WPACKET_allocate_bytes(pkt, extlen, &extbytes)
R
Rich Salz 已提交
304
                || i2d_X509_EXTENSIONS(s->ext.ocsp.exts, &extbytes)
305
                   != extlen) {
M
Matt Caswell 已提交
306
            SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
307 308 309 310 311
                   ERR_R_INTERNAL_ERROR);
            return 0;
       }
    }
    if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
M
Matt Caswell 已提交
312
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
313 314 315 316 317 318 319 320
        return 0;
    }

    return 1;
}
#endif

#ifndef OPENSSL_NO_NEXTPROTONEG
321 322
int tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
                           size_t chainidx, int *al)
323
{
324
    if (s->ctx->ext.npn_select_cb == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
325 326 327 328 329 330 331 332
        return 1;

    /*
     * The client advertises an empty extension to indicate its support
     * for Next Protocol Negotiation
     */
    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg)
            || !WPACKET_put_bytes_u16(pkt, 0)) {
M
Matt Caswell 已提交
333
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_NPN, ERR_R_INTERNAL_ERROR);
334 335 336 337 338 339 340
        return 0;
    }

    return 1;
}
#endif

341 342
int tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
                            size_t chainidx, int *al)
343 344 345
{
    s->s3->alpn_sent = 0;

346
    if (s->ext.alpn == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
347 348 349 350 351 352
        return 1;

    if (!WPACKET_put_bytes_u16(pkt,
                TLSEXT_TYPE_application_layer_protocol_negotiation)
               /* Sub-packet ALPN extension */
            || !WPACKET_start_sub_packet_u16(pkt)
R
Rich Salz 已提交
353
            || !WPACKET_sub_memcpy_u16(pkt, s->ext.alpn, s->ext.alpn_len)
354
            || !WPACKET_close(pkt)) {
M
Matt Caswell 已提交
355
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ALPN, ERR_R_INTERNAL_ERROR);
356 357 358 359 360 361 362 363 364
        return 0;
    }
    s->s3->alpn_sent = 1;

    return 1;
}


#ifndef OPENSSL_NO_SRTP
365 366
int tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
                                X509 *x, size_t chainidx, int *al)
367 368
{
    STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = SSL_get_srtp_profiles(s);
369
    int i, end;
370 371 372 373 374 375 376 377 378

    if (clnt == NULL)
        return 1;

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp)
               /* Sub-packet for SRTP extension */
            || !WPACKET_start_sub_packet_u16(pkt)
               /* Sub-packet for the protection profile list */
            || !WPACKET_start_sub_packet_u16(pkt)) {
M
Matt Caswell 已提交
379
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
380 381
        return 0;
    }
382 383 384 385 386 387

    end = sk_SRTP_PROTECTION_PROFILE_num(clnt);
    for (i = 0; i < end; i++) {
        const SRTP_PROTECTION_PROFILE *prof =
            sk_SRTP_PROTECTION_PROFILE_value(clnt, i);

388
        if (prof == NULL || !WPACKET_put_bytes_u16(pkt, prof->id)) {
M
Matt Caswell 已提交
389
            SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
390 391 392 393 394 395 396
            return 0;
        }
    }
    if (!WPACKET_close(pkt)
               /* Add an empty use_mki value */
            || !WPACKET_put_bytes_u8(pkt, 0)
            || !WPACKET_close(pkt)) {
M
Matt Caswell 已提交
397
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
398 399 400 401 402 403 404
        return 0;
    }

    return 1;
}
#endif

405 406
int tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
                           size_t chainidx, int *al)
407 408 409 410 411 412
{
    if (s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
        return 1;

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac)
            || !WPACKET_put_bytes_u16(pkt, 0)) {
M
Matt Caswell 已提交
413
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ETM, ERR_R_INTERNAL_ERROR);
414 415 416 417 418 419 420
        return 0;
    }

    return 1;
}

#ifndef OPENSSL_NO_CT
421 422
int tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
                           size_t chainidx, int *al)
423 424 425 426
{
    if (s->ct_validation_callback == NULL)
        return 1;

427 428 429 430
    /* Not defined for client Certificates */
    if (x != NULL)
        return 1;

431 432
    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signed_certificate_timestamp)
            || !WPACKET_put_bytes_u16(pkt, 0)) {
M
Matt Caswell 已提交
433
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SCT, ERR_R_INTERNAL_ERROR);
434 435 436 437 438 439 440
        return 0;
    }

    return 1;
}
#endif

441 442
int tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
                           size_t chainidx, int *al)
443 444 445
{
    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret)
            || !WPACKET_put_bytes_u16(pkt, 0)) {
M
Matt Caswell 已提交
446
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EMS, ERR_R_INTERNAL_ERROR);
447 448 449 450 451 452
        return 0;
    }

    return 1;
}

453 454
int tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt,
                                          unsigned int context, X509 *x,
455
                                          size_t chainidx, int *al)
456 457 458 459 460 461
{
    int currv, min_version, max_version, reason;

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_versions)
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_start_sub_packet_u8(pkt)) {
M
Matt Caswell 已提交
462
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
463 464 465 466 467 468
               ERR_R_INTERNAL_ERROR);
        return 0;
    }

    reason = ssl_get_client_min_max_version(s, &min_version, &max_version);
    if (reason != 0) {
M
Matt Caswell 已提交
469
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS, reason);
470 471 472 473
        return 0;
    }

    /*
F
FdaSilvaYY 已提交
474
     * TODO(TLS1.3): There is some discussion on the TLS list as to whether
475 476 477 478 479 480 481
     * we should include versions <TLS1.2. For the moment we do. To be
     * reviewed later.
     */
    for (currv = max_version; currv >= min_version; currv--) {
        /* TODO(TLS1.3): Remove this first if clause prior to release!! */
        if (currv == TLS1_3_VERSION) {
            if (!WPACKET_put_bytes_u16(pkt, TLS1_3_VERSION_DRAFT)) {
M
Matt Caswell 已提交
482
                SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
483 484 485 486
                       ERR_R_INTERNAL_ERROR);
                return 0;
            }
        } else if (!WPACKET_put_bytes_u16(pkt, currv)) {
M
Matt Caswell 已提交
487
            SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
488 489 490 491 492
                   ERR_R_INTERNAL_ERROR);
            return 0;
        }
    }
    if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
M
Matt Caswell 已提交
493
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
494 495 496 497 498 499 500
               ERR_R_INTERNAL_ERROR);
        return 0;
    }

    return 1;
}

501 502 503 504
/*
 * Construct a psk_kex_modes extension. We only have two modes we know about
 * at this stage, so we send both.
 */
505 506
int tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt, unsigned int context,
                                     X509 *x, size_t chainidx, int *al)
507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522
{
#ifndef OPENSSL_NO_TLS1_3
    /*
     * TODO(TLS1.3): Do we want this list to be configurable? For now we always
     * just send both supported modes
     */
    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk_kex_modes)
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_start_sub_packet_u8(pkt)
            || !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE_DHE)
            || !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE)
            || !WPACKET_close(pkt)
            || !WPACKET_close(pkt)) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK_KEX_MODES, ERR_R_INTERNAL_ERROR);
        return 0;
    }
523 524

    s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_KE | TLSEXT_KEX_MODE_FLAG_KE_DHE;
525 526 527 528 529
#endif

    return 1;
}

530 531 532
#ifndef OPENSSL_NO_TLS1_3
static int add_key_share(SSL *s, WPACKET *pkt, unsigned int curve_id)
{
533 534
    unsigned char *encoded_point;
    EVP_PKEY *key_share_key;
535 536 537 538 539 540 541 542 543 544
    size_t encodedlen;

    key_share_key = ssl_generate_pkey_curve(curve_id);
    if (key_share_key == NULL) {
        SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_EVP_LIB);
        return 0;
    }

    /* Encode the public key. */
    encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key,
545
                                                &encoded_point);
546 547 548 549 550 551 552 553
    if (encodedlen == 0) {
        SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_EC_LIB);
        EVP_PKEY_free(key_share_key);
        return 0;
    }

    /* Create KeyShareEntry */
    if (!WPACKET_put_bytes_u16(pkt, curve_id)
554
            || !WPACKET_sub_memcpy_u16(pkt, encoded_point, encodedlen)) {
555 556
        SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_INTERNAL_ERROR);
        EVP_PKEY_free(key_share_key);
557
        OPENSSL_free(encoded_point);
558 559 560 561 562 563 564 565 566 567
        return 0;
    }

    /*
     * TODO(TLS1.3): When changing to send more than one key_share we're
     * going to need to be able to save more than one EVP_PKEY. For now
     * we reuse the existing tmp.pkey
     */
    s->s3->tmp.pkey = key_share_key;
    s->s3->group_id = curve_id;
568
    OPENSSL_free(encoded_point);
569 570 571 572 573

    return 1;
}
#endif

574 575
int tls_construct_ctos_key_share(SSL *s, WPACKET *pkt, unsigned int context,
                                 X509 *x, size_t chainidx, int *al)
576
{
M
Matt Caswell 已提交
577
#ifndef OPENSSL_NO_TLS1_3
578
    size_t i, num_curves = 0;
579
    const unsigned char *pcurves = NULL;
580
    unsigned int curve_id = 0;
581 582 583 584 585 586 587

    /* key_share extension */
    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
               /* Extension data sub-packet */
            || !WPACKET_start_sub_packet_u16(pkt)
               /* KeyShare list sub-packet */
            || !WPACKET_start_sub_packet_u16(pkt)) {
M
Matt Caswell 已提交
588
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
589 590 591 592
        return 0;
    }

    if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
M
Matt Caswell 已提交
593
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
594 595 596
        return 0;
    }

597 598 599 600 601 602
    if (s->s3->tmp.pkey != NULL) {
        /* Shouldn't happen! */
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
        return 0;
    }

603 604 605 606
    /*
     * TODO(TLS1.3): Make the number of key_shares sent configurable. For
     * now, just send one
     */
607 608 609 610
    if (s->s3->group_id != 0) {
        curve_id = s->s3->group_id;
    } else {
        for (i = 0; i < num_curves; i++, pcurves += 2) {
611

612 613
            if (!tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED))
                continue;
614

M
Matt Caswell 已提交
615
            curve_id = bytestogroup(pcurves);
616
            break;
617
        }
618
    }
619

620 621 622
    if (curve_id == 0) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, SSL_R_NO_SUITABLE_KEY_SHARE);
        return 0;
623 624
    }

625 626 627
    if (!add_key_share(s, pkt, curve_id))
        return 0;

628
    if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
M
Matt Caswell 已提交
629
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
630 631
        return 0;
    }
M
Matt Caswell 已提交
632
#endif
633 634 635 636

    return 1;
}

M
Matt Caswell 已提交
637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658
int tls_construct_ctos_cookie(SSL *s, WPACKET *pkt, unsigned int context,
                              X509 *x, size_t chainidx, int *al)
{
    int ret = 0;

    /* Should only be set if we've had an HRR */
    if (s->ext.tls13_cookie_len == 0)
        return 1;

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_cookie)
               /* Extension data sub-packet */
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_sub_memcpy_u16(pkt, s->ext.tls13_cookie,
                                       s->ext.tls13_cookie_len)
            || !WPACKET_close(pkt)) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_COOKIE, ERR_R_INTERNAL_ERROR);
        goto end;
    }

    ret = 1;
 end:
    OPENSSL_free(s->ext.tls13_cookie);
659
    s->ext.tls13_cookie = NULL;
M
Matt Caswell 已提交
660 661 662 663 664
    s->ext.tls13_cookie_len = 0;

    return ret;
}

665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690
int tls_construct_ctos_early_data(SSL *s, WPACKET *pkt, unsigned int context,
                                  X509 *x, size_t chainidx, int *al)
{
    if (s->early_data_state != SSL_EARLY_DATA_CONNECTING
            || s->session->ext.max_early_data == 0) {
        s->max_early_data = 0;
        return 1;
    }
    s->max_early_data = s->session->ext.max_early_data;

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_early_data)
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_close(pkt)) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA, ERR_R_INTERNAL_ERROR);
        return 0;
    }

    /*
     * We set this to rejected here. Later, if the server acknowledges the
     * extension, we set it to accepted.
     */
    s->ext.early_data = SSL_EARLY_DATA_REJECTED;

    return 1;
}

691 692 693
#define F5_WORKAROUND_MIN_MSG_LEN   0xff
#define F5_WORKAROUND_MAX_MSG_LEN   0x200

M
Matt Caswell 已提交
694 695 696 697 698 699 700 701 702 703 704 705 706 707
/*
 * PSK pre binder overhead =
 *  2 bytes for TLSEXT_TYPE_psk
 *  2 bytes for extension length
 *  2 bytes for identities list length
 *  2 bytes for identity length
 *  4 bytes for obfuscated_ticket_age
 *  2 bytes for binder list length
 *  1 byte for binder length
 * The above excludes the number of bytes for the identity itself and the
 * subsequent binder bytes
 */
#define PSK_PRE_BINDER_OVERHEAD (2 + 2 + 2 + 2 + 4 + 2 + 1)

708 709
int tls_construct_ctos_padding(SSL *s, WPACKET *pkt, unsigned int context,
                               X509 *x, size_t chainidx, int *al)
710 711 712 713 714 715 716 717
{
    unsigned char *padbytes;
    size_t hlen;

    if ((s->options & SSL_OP_TLSEXT_PADDING) == 0)
        return 1;

    /*
M
Matt Caswell 已提交
718 719 720 721
     * Add padding to workaround bugs in F5 terminators. See RFC7685.
     * This code calculates the length of all extensions added so far but
     * excludes the PSK extension (because that MUST be written last). Therefore
     * this extension MUST always appear second to last.
722 723
     */
    if (!WPACKET_get_total_written(pkt, &hlen)) {
M
Matt Caswell 已提交
724
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
725 726 727
        return 0;
    }

M
Matt Caswell 已提交
728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746
    /*
     * If we're going to send a PSK then that will be written out after this
     * extension, so we need to calculate how long it is going to be.
     */
    if (s->session->ssl_version == TLS1_3_VERSION
            && s->session->ext.ticklen != 0
            && s->session->cipher != NULL) {
        const EVP_MD *md = ssl_md(s->session->cipher->algorithm2);

        if (md != NULL) {
            /*
             * Add the fixed PSK overhead, the identity length and the binder
             * length.
             */
            hlen +=  PSK_PRE_BINDER_OVERHEAD + s->session->ext.ticklen
                     + EVP_MD_size(md);
        }
    }

747
    if (hlen > F5_WORKAROUND_MIN_MSG_LEN && hlen < F5_WORKAROUND_MAX_MSG_LEN) {
F
FdaSilvaYY 已提交
748
        /* Calculate the amount of padding we need to add */
749 750 751 752 753 754
        hlen = F5_WORKAROUND_MAX_MSG_LEN - hlen;

        /*
         * Take off the size of extension header itself (2 bytes for type and
         * 2 bytes for length bytes)
         */
755 756 757 758 759 760 761
        if (hlen >= 4)
            hlen -= 4;
        else
            hlen = 0;

        if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_padding)
                || !WPACKET_sub_allocate_bytes_u16(pkt, hlen, &padbytes)) {
M
Matt Caswell 已提交
762
            SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
763 764 765 766 767 768 769 770
            return 0;
        }
        memset(padbytes, 0, hlen);
    }

    return 1;
}

771 772 773
/*
 * Construct the pre_shared_key extension
 */
774 775
int tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
                           size_t chainidx, int *al)
776 777
{
#ifndef OPENSSL_NO_TLS1_3
778
    uint32_t now, agesec, agems;
779
    size_t hashsize, binderoffset, msglen;
780 781 782 783 784 785
    unsigned char *binder = NULL, *msgstart = NULL;
    const EVP_MD *md;
    int ret = 0;

    s->session->ext.tick_identity = TLSEXT_PSK_BAD_IDENTITY;

M
Matt Caswell 已提交
786 787 788 789 790 791
    /*
     * Note: At this stage of the code we only support adding a single
     * resumption PSK. If we add support for multiple PSKs then the length
     * calculations in the padding extension will need to be adjusted.
     */

792
    /*
793 794
     * If this is an incompatible or new session then we have nothing to resume
     * so don't add this extension.
795
     */
796 797
    if (s->session->ssl_version != TLS1_3_VERSION
            || s->session->ext.ticklen == 0)
798 799
        return 1;

800 801 802 803 804
    if (s->session->cipher == NULL) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
        goto err;
    }

805 806
    md = ssl_md(s->session->cipher->algorithm2);
    if (md == NULL) {
F
FdaSilvaYY 已提交
807
        /* Don't recognize this cipher so we can't use the session. Ignore it */
808 809 810
        return 1;
    }

811 812 813 814 815 816 817 818
    if (s->hello_retry_request && md != ssl_handshake_md(s)) {
        /*
         * Selected ciphersuite hash does not match the hash for the session so
         * we can't use it.
         */
        return 1;
    }

819 820 821 822 823 824 825 826
    /*
     * Technically the C standard just says time() returns a time_t and says
     * nothing about the encoding of that type. In practice most implementations
     * follow POSIX which holds it as an integral type in seconds since epoch.
     * We've already made the assumption that we can do this in multiple places
     * in the code, so portability shouldn't be an issue.
     */
    now = (uint32_t)time(NULL);
827
    agesec = now - (uint32_t)s->session->time;
828

829
    if (s->session->ext.tick_lifetime_hint < agesec) {
M
Matt Caswell 已提交
830 831 832 833
        /* Ticket is too old. Ignore it. */
        return 1;
    }

834 835 836 837
    /*
     * Calculate age in ms. We're just doing it to nearest second. Should be
     * good enough.
     */
838
    agems = agesec * (uint32_t)1000;
839

840
    if (agesec != 0 && agems / (uint32_t)1000 != agesec) {
841 842 843 844 845 846 847
        /*
         * Overflow. Shouldn't happen unless this is a *really* old session. If
         * so we just ignore it.
         */
        return 1;
    }

M
Matt Caswell 已提交
848 849 850 851 852
    /*
     * Obfuscate the age. Overflow here is fine, this addition is supposed to
     * be mod 2^32.
     */
    agems += s->session->ext.tick_age_add;
853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880

    hashsize = EVP_MD_size(md);

    /* Create the extension, but skip over the binder for now */
    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk)
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick,
                                       s->session->ext.ticklen)
            || !WPACKET_put_bytes_u32(pkt, agems)
            || !WPACKET_close(pkt)
            || !WPACKET_get_total_written(pkt, &binderoffset)
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_sub_allocate_bytes_u8(pkt, hashsize, &binder)
            || !WPACKET_close(pkt)
            || !WPACKET_close(pkt)
            || !WPACKET_get_total_written(pkt, &msglen)
               /*
                * We need to fill in all the sub-packet lengths now so we can
                * calculate the HMAC of the message up to the binders
                */
            || !WPACKET_fill_lengths(pkt)) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    msgstart = WPACKET_get_curr(pkt) - msglen;

881 882
    if (tls_psk_do_binder(s, md, msgstart, binderoffset, NULL, binder,
                          s->session, 1) != 1) {
883 884 885 886 887 888 889 890 891 892 893 894 895 896
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    s->session->ext.tick_identity = 0;

    ret = 1;
 err:
    return ret;
#else
    return 1;
#endif
}

897 898 899
/*
 * Parse the server's renegotiation binding and abort if it's not right
 */
900 901
int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
                               X509 *x, size_t chainidx, int *al)
902 903 904 905 906 907 908 909 910 911 912 913
{
    size_t expected_len = s->s3->previous_client_finished_len
        + s->s3->previous_server_finished_len;
    size_t ilen;
    const unsigned char *data;

    /* Check for logic errors */
    assert(expected_len == 0 || s->s3->previous_client_finished_len != 0);
    assert(expected_len == 0 || s->s3->previous_server_finished_len != 0);

    /* Parse the length byte */
    if (!PACKET_get_1_len(pkt, &ilen)) {
M
Matt Caswell 已提交
914
        SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
915 916 917 918 919 920 921
               SSL_R_RENEGOTIATION_ENCODING_ERR);
        *al = SSL_AD_ILLEGAL_PARAMETER;
        return 0;
    }

    /* Consistency check */
    if (PACKET_remaining(pkt) != ilen) {
M
Matt Caswell 已提交
922
        SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
923 924 925 926 927 928 929
               SSL_R_RENEGOTIATION_ENCODING_ERR);
        *al = SSL_AD_ILLEGAL_PARAMETER;
        return 0;
    }

    /* Check that the extension matches */
    if (ilen != expected_len) {
M
Matt Caswell 已提交
930
        SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
931 932 933 934 935 936 937 938
               SSL_R_RENEGOTIATION_MISMATCH);
        *al = SSL_AD_HANDSHAKE_FAILURE;
        return 0;
    }

    if (!PACKET_get_bytes(pkt, &data, s->s3->previous_client_finished_len)
        || memcmp(data, s->s3->previous_client_finished,
                  s->s3->previous_client_finished_len) != 0) {
M
Matt Caswell 已提交
939
        SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
940 941 942 943 944 945 946 947
               SSL_R_RENEGOTIATION_MISMATCH);
        *al = SSL_AD_HANDSHAKE_FAILURE;
        return 0;
    }

    if (!PACKET_get_bytes(pkt, &data, s->s3->previous_server_finished_len)
        || memcmp(data, s->s3->previous_server_finished,
                  s->s3->previous_server_finished_len) != 0) {
M
Matt Caswell 已提交
948
        SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
949 950 951 952 953 954 955 956 957
               SSL_R_RENEGOTIATION_MISMATCH);
        *al = SSL_AD_ILLEGAL_PARAMETER;
        return 0;
    }
    s->s3->send_connection_binding = 1;

    return 1;
}

958 959
int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context,
                               X509 *x, size_t chainidx, int *al)
960
{
R
Rich Salz 已提交
961
    if (s->ext.hostname == NULL || PACKET_remaining(pkt) > 0) {
962 963 964 965 966
        *al = SSL_AD_UNRECOGNIZED_NAME;
        return 0;
    }

    if (!s->hit) {
R
Rich Salz 已提交
967
        if (s->session->ext.hostname != NULL) {
968 969 970
            *al = SSL_AD_INTERNAL_ERROR;
            return 0;
        }
R
Rich Salz 已提交
971 972
        s->session->ext.hostname = OPENSSL_strdup(s->ext.hostname);
        if (s->session->ext.hostname == NULL) {
973 974 975 976 977 978 979 980 981
            *al = SSL_AD_INTERNAL_ERROR;
            return 0;
        }
    }

    return 1;
}

#ifndef OPENSSL_NO_EC
982 983
int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
                                 X509 *x, size_t chainidx, int *al)
984
{
R
Rich Salz 已提交
985
    unsigned int ecpointformats_len;
986 987 988 989 990 991 992
    PACKET ecptformatlist;

    if (!PACKET_as_length_prefixed_1(pkt, &ecptformatlist)) {
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }
    if (!s->hit) {
R
Rich Salz 已提交
993 994
        ecpointformats_len = PACKET_remaining(&ecptformatlist);
        s->session->ext.ecpointformats_len = 0;
995

R
Rich Salz 已提交
996 997 998
        OPENSSL_free(s->session->ext.ecpointformats);
        s->session->ext.ecpointformats = OPENSSL_malloc(ecpointformats_len);
        if (s->session->ext.ecpointformats == NULL) {
999 1000 1001 1002
            *al = SSL_AD_INTERNAL_ERROR;
            return 0;
        }

R
Rich Salz 已提交
1003
        s->session->ext.ecpointformats_len = ecpointformats_len;
1004 1005

        if (!PACKET_copy_bytes(&ecptformatlist,
R
Rich Salz 已提交
1006 1007
                               s->session->ext.ecpointformats,
                               ecpointformats_len)) {
1008 1009 1010 1011 1012 1013 1014 1015 1016
            *al = SSL_AD_INTERNAL_ERROR;
            return 0;
        }
    }

    return 1;
}
#endif

1017 1018
int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
                                  X509 *x, size_t chainidx, int *al)
1019
{
R
Rich Salz 已提交
1020 1021 1022 1023
    if (s->ext.session_ticket_cb != NULL &&
        !s->ext.session_ticket_cb(s, PACKET_data(pkt),
                              PACKET_remaining(pkt),
                              s->ext.session_ticket_cb_arg)) {
1024 1025 1026
        *al = SSL_AD_INTERNAL_ERROR;
        return 0;
    }
1027

1028 1029 1030 1031
    if (!tls_use_ticket(s) || PACKET_remaining(pkt) > 0) {
        *al = SSL_AD_UNSUPPORTED_EXTENSION;
        return 0;
    }
1032

R
Rich Salz 已提交
1033
    s->ext.ticket_expected = 1;
1034 1035 1036 1037

    return 1;
}

1038
#ifndef OPENSSL_NO_OCSP
1039 1040
int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context,
                                  X509 *x, size_t chainidx, int *al)
1041 1042
{
    /*
1043 1044
     * MUST only be sent if we've requested a status
     * request message. In TLS <= 1.2 it must also be empty.
1045
     */
1046
    if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp
1047
            || (!SSL_IS_TLS13(s) && PACKET_remaining(pkt) > 0)) {
1048 1049 1050
        *al = SSL_AD_UNSUPPORTED_EXTENSION;
        return 0;
    }
1051 1052 1053

    if (SSL_IS_TLS13(s)) {
        /* We only know how to handle this if it's for the first Certificate in
F
FdaSilvaYY 已提交
1054
         * the chain. We ignore any other responses.
1055
         */
1056
        if (chainidx != 0)
1057 1058 1059 1060
            return 1;
        return tls_process_cert_status_body(s, pkt, al);
    }

1061
    /* Set flag to expect CertificateStatus message */
R
Rich Salz 已提交
1062
    s->ext.status_expected = 1;
1063 1064 1065

    return 1;
}
1066
#endif
1067 1068 1069


#ifndef OPENSSL_NO_CT
1070 1071
int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                       size_t chainidx, int *al)
1072 1073 1074 1075 1076 1077 1078 1079 1080 1081
{
    /*
     * Only take it if we asked for it - i.e if there is no CT validation
     * callback set, then a custom extension MAY be processing it, so we
     * need to let control continue to flow to that.
     */
    if (s->ct_validation_callback != NULL) {
        size_t size = PACKET_remaining(pkt);

        /* Simply copy it off for later processing */
R
Rich Salz 已提交
1082 1083
        OPENSSL_free(s->ext.scts);
        s->ext.scts = NULL;
1084

R
Rich Salz 已提交
1085
        s->ext.scts_len = size;
1086
        if (size > 0) {
R
Rich Salz 已提交
1087 1088 1089
            s->ext.scts = OPENSSL_malloc(size);
            if (s->ext.scts == NULL
                    || !PACKET_copy_bytes(pkt, s->ext.scts, size)) {
1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123
                *al = SSL_AD_INTERNAL_ERROR;
                return 0;
            }
        }
    } else {
        if (custom_ext_parse(s, 0, TLSEXT_TYPE_signed_certificate_timestamp,
                             PACKET_data(pkt), PACKET_remaining(pkt), al) <= 0)
            return 0;
    }

    return 1;
}
#endif


#ifndef OPENSSL_NO_NEXTPROTONEG
/*
 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
 * elements of zero length are allowed and the set of elements must exactly
 * fill the length of the block. Returns 1 on success or 0 on failure.
 */
static int ssl_next_proto_validate(PACKET *pkt)
{
    PACKET tmp_protocol;

    while (PACKET_remaining(pkt)) {
        if (!PACKET_get_length_prefixed_1(pkt, &tmp_protocol)
            || PACKET_remaining(&tmp_protocol) == 0)
            return 0;
    }

    return 1;
}

1124 1125
int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                       size_t chainidx, int *al)
1126 1127 1128 1129 1130
{
    unsigned char *selected;
    unsigned char selected_len;
    PACKET tmppkt;

1131
    /* Check if we are in a renegotiation. If so ignore this extension */
1132
    if (!SSL_IS_FIRST_HANDSHAKE(s))
1133 1134 1135
        return 1;

    /* We must have requested it. */
R
Rich Salz 已提交
1136
    if (s->ctx->ext.npn_select_cb == NULL) {
1137 1138 1139
        *al = SSL_AD_UNSUPPORTED_EXTENSION;
        return 0;
    }
1140

1141 1142 1143 1144 1145 1146
    /* The data must be valid */
    tmppkt = *pkt;
    if (!ssl_next_proto_validate(&tmppkt)) {
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }
R
Rich Salz 已提交
1147 1148 1149 1150
    if (s->ctx->ext.npn_select_cb(s, &selected, &selected_len,
                                  PACKET_data(pkt),
                                  PACKET_remaining(pkt),
                                  s->ctx->ext.npn_select_cb_arg) !=
1151 1152 1153 1154
             SSL_TLSEXT_ERR_OK) {
        *al = SSL_AD_INTERNAL_ERROR;
        return 0;
    }
1155

1156 1157 1158 1159
    /*
     * Could be non-NULL if server has sent multiple NPN extensions in
     * a single Serverhello
     */
R
Rich Salz 已提交
1160 1161 1162
    OPENSSL_free(s->ext.npn);
    s->ext.npn = OPENSSL_malloc(selected_len);
    if (s->ext.npn == NULL) {
1163 1164 1165 1166
        *al = SSL_AD_INTERNAL_ERROR;
        return 0;
    }

R
Rich Salz 已提交
1167 1168 1169
    memcpy(s->ext.npn, selected, selected_len);
    s->ext.npn_len = selected_len;
    s->s3->npn_seen = 1;
1170 1171 1172 1173 1174

    return 1;
}
#endif

1175 1176
int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                        size_t chainidx, int *al)
1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212
{
    size_t len;

    /* We must have requested it. */
    if (!s->s3->alpn_sent) {
        *al = SSL_AD_UNSUPPORTED_EXTENSION;
        return 0;
    }
    /*-
     * The extension data consists of:
     *   uint16 list_length
     *   uint8 proto_length;
     *   uint8 proto[proto_length];
     */
    if (!PACKET_get_net_2_len(pkt, &len)
        || PACKET_remaining(pkt) != len || !PACKET_get_1_len(pkt, &len)
        || PACKET_remaining(pkt) != len) {
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }
    OPENSSL_free(s->s3->alpn_selected);
    s->s3->alpn_selected = OPENSSL_malloc(len);
    if (s->s3->alpn_selected == NULL) {
        *al = SSL_AD_INTERNAL_ERROR;
        return 0;
    }
    if (!PACKET_copy_bytes(pkt, s->s3->alpn_selected, len)) {
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }
    s->s3->alpn_selected_len = len;

    return 1;
}

#ifndef OPENSSL_NO_SRTP
1213 1214
int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                            size_t chainidx, int *al)
1215 1216 1217 1218 1219 1220
{
    unsigned int id, ct, mki;
    int i;
    STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
    SRTP_PROTECTION_PROFILE *prof;

1221 1222 1223 1224
    if (!PACKET_get_net_2(pkt, &ct) || ct != 2
            || !PACKET_get_net_2(pkt, &id)
            || !PACKET_get_1(pkt, &mki)
            || PACKET_remaining(pkt) != 0) {
M
Matt Caswell 已提交
1225
        SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
1226 1227 1228 1229 1230 1231 1232
               SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }

    if (mki != 0) {
        /* Must be no MKI, since we never offer one */
M
Matt Caswell 已提交
1233
        SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_BAD_SRTP_MKI_VALUE);
1234 1235 1236 1237 1238
        *al = SSL_AD_ILLEGAL_PARAMETER;
        return 0;
    }

    /* Throw an error if the server gave us an unsolicited extension */
1239
    clnt = SSL_get_srtp_profiles(s);
1240
    if (clnt == NULL) {
M
Matt Caswell 已提交
1241
        SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_NO_SRTP_PROFILES);
1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }

    /*
     * Check to see if the server gave us something we support (and
     * presumably offered)
     */
    for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) {
        prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);

        if (prof->id == id) {
            s->srtp_profile = prof;
            *al = 0;
            return 1;
        }
    }

M
Matt Caswell 已提交
1260
    SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
1261 1262 1263 1264 1265 1266
           SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
    *al = SSL_AD_DECODE_ERROR;
    return 0;
}
#endif

1267 1268
int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                       size_t chainidx, int *al)
1269 1270 1271 1272 1273
{
    /* Ignore if inappropriate ciphersuite */
    if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
            && s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
            && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
1274
        s->ext.use_etm = 1;
1275 1276 1277 1278

    return 1;
}

1279 1280
int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                       size_t chainidx, int *al)
1281 1282 1283 1284 1285 1286 1287 1288
{
    s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
    if (!s->hit)
        s->session->flags |= SSL_SESS_FLAG_EXTMS;

    return 1;
}

1289 1290
int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                             size_t chainidx, int *al)
1291
{
M
Matt Caswell 已提交
1292
#ifndef OPENSSL_NO_TLS1_3
1293 1294 1295 1296 1297
    unsigned int group_id;
    PACKET encoded_pt;
    EVP_PKEY *ckey = s->s3->tmp.pkey, *skey = NULL;

    /* Sanity check */
1298
    if (ckey == NULL || s->s3->peer_tmp != NULL) {
1299
        *al = SSL_AD_INTERNAL_ERROR;
M
Matt Caswell 已提交
1300
        SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1301 1302 1303 1304 1305
        return 0;
    }

    if (!PACKET_get_net_2(pkt, &group_id)) {
        *al = SSL_AD_HANDSHAKE_FAILURE;
M
Matt Caswell 已提交
1306
        SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1307 1308 1309
        return 0;
    }

1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335
    if ((context & EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) {
        unsigned const char *pcurves = NULL;
        size_t i, num_curves;

        if (PACKET_remaining(pkt) != 0) {
            *al = SSL_AD_HANDSHAKE_FAILURE;
            SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
            return 0;
        }

        /*
         * It is an error if the HelloRetryRequest wants a key_share that we
         * already sent in the first ClientHello
         */
        if (group_id == s->s3->group_id) {
            *al = SSL_AD_ILLEGAL_PARAMETER;
            SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
            return 0;
        }

        /* Validate the selected group is one we support */
        if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
            SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
            return 0;
        }
        for (i = 0; i < num_curves; i++, pcurves += 2) {
M
Matt Caswell 已提交
1336
            if (group_id == bytestogroup(pcurves))
1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351
                break;
        }
        if (i >= num_curves
                || !tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED)) {
            *al = SSL_AD_ILLEGAL_PARAMETER;
            SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
            return 0;
        }

        s->s3->group_id = group_id;
        EVP_PKEY_free(s->s3->tmp.pkey);
        s->s3->tmp.pkey = NULL;
        return 1;
    }

1352 1353 1354 1355 1356 1357
    if (group_id != s->s3->group_id) {
        /*
         * This isn't for the group that we sent in the original
         * key_share!
         */
        *al = SSL_AD_HANDSHAKE_FAILURE;
M
Matt Caswell 已提交
1358
        SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1359 1360 1361 1362 1363 1364
        return 0;
    }

    if (!PACKET_as_length_prefixed_2(pkt, &encoded_pt)
            || PACKET_remaining(&encoded_pt) == 0) {
        *al = SSL_AD_DECODE_ERROR;
M
Matt Caswell 已提交
1365
        SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1366 1367 1368 1369 1370 1371
        return 0;
    }

    skey = ssl_generate_pkey(ckey);
    if (skey == NULL) {
        *al = SSL_AD_INTERNAL_ERROR;
M
Matt Caswell 已提交
1372
        SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_MALLOC_FAILURE);
1373 1374 1375 1376 1377
        return 0;
    }
    if (!EVP_PKEY_set1_tls_encodedpoint(skey, PACKET_data(&encoded_pt),
                                        PACKET_remaining(&encoded_pt))) {
        *al = SSL_AD_DECODE_ERROR;
M
Matt Caswell 已提交
1378
        SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_ECPOINT);
1379
        EVP_PKEY_free(skey);
1380 1381 1382 1383 1384
        return 0;
    }

    if (ssl_derive(s, ckey, skey, 1) == 0) {
        *al = SSL_AD_INTERNAL_ERROR;
M
Matt Caswell 已提交
1385
        SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1386 1387 1388
        EVP_PKEY_free(skey);
        return 0;
    }
1389
    s->s3->peer_tmp = skey;
M
Matt Caswell 已提交
1390
#endif
1391 1392 1393

    return 1;
}
1394

M
Matt Caswell 已提交
1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410
int tls_parse_stoc_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                       size_t chainidx, int *al)
{
    PACKET cookie;

    if (!PACKET_as_length_prefixed_2(pkt, &cookie)
            || !PACKET_memdup(&cookie, &s->ext.tls13_cookie,
                              &s->ext.tls13_cookie_len)) {
        *al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PARSE_STOC_COOKIE, SSL_R_LENGTH_MISMATCH);
        return 0;
    }

    return 1;
}

1411 1412 1413
int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
                              X509 *x, size_t chainidx, int *al)
{
1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429
    if (context == EXT_TLS1_3_NEW_SESSION_TICKET) {
        unsigned long max_early_data;

        if (!PACKET_get_net_4(pkt, &max_early_data)
                || PACKET_remaining(pkt) != 0) {
            SSLerr(SSL_F_TLS_PARSE_STOC_EARLY_DATA,
                   SSL_R_INVALID_MAX_EARLY_DATA);
            *al = SSL_AD_DECODE_ERROR;
            return 0;
        }

        s->session->ext.max_early_data = max_early_data;

        return 1;
    }

1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450
    if (PACKET_remaining(pkt) != 0) {
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }

    if (s->ext.early_data != SSL_EARLY_DATA_REJECTED
            || !s->hit
            || s->session->ext.tick_identity != 0) {
        /*
         * If we get here then we didn't send early data, or we didn't resume
         * using the first identity so the server should not be accepting it.
         */
        *al = SSL_AD_ILLEGAL_PARAMETER;
        return 0;
    }

    s->ext.early_data = SSL_EARLY_DATA_ACCEPTED;

    return 1;
}

1451 1452
int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                       size_t chainidx, int *al)
1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473
{
#ifndef OPENSSL_NO_TLS1_3
    unsigned int identity;

    if (!PACKET_get_net_2(pkt, &identity) || PACKET_remaining(pkt) != 0) {
        *al = SSL_AD_HANDSHAKE_FAILURE;
        SSLerr(SSL_F_TLS_PARSE_STOC_PSK, SSL_R_LENGTH_MISMATCH);
        return 0;
    }

    if (s->session->ext.tick_identity != (int)identity) {
        *al = SSL_AD_HANDSHAKE_FAILURE;
        SSLerr(SSL_F_TLS_PARSE_STOC_PSK, SSL_R_BAD_PSK_IDENTITY);
        return 0;
    }

    s->hit = 1;
#endif

    return 1;
}