openssl/ssl/d1_clnt.c - Issue 2072073002: Delete bundled copy of OpenSSL and replace with README.

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Issue 2072073002: Delete bundled copy of OpenSSL and replace with README. (Closed) Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master

Patch Set: Delete bundled copy of OpenSSL and replace with README. Created 4 years, 6 months ago

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1 /* ssl/d1_clnt.c */

2 /*

3 * DTLS implementation written by Nagendra Modadugu

4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.

5 */

6 /* ====================================================================

7 * Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved.

8 *

9 * Redistribution and use in source and binary forms, with or without

10 * modification, are permitted provided that the following conditions

11 * are met:

12 *

13 * 1. Redistributions of source code must retain the above copyright

14 * notice, this list of conditions and the following disclaimer.

15 *

16 * 2. Redistributions in binary form must reproduce the above copyright

17 * notice, this list of conditions and the following disclaimer in

18 * the documentation and/or other materials provided with the

19 * distribution.

20 *

21 * 3. All advertising materials mentioning features or use of this

22 * software must display the following acknowledgment:

23 * "This product includes software developed by the OpenSSL Project

24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"

25 *

26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

27 * endorse or promote products derived from this software without

28 * prior written permission. For written permission, please contact

29 * openssl-core@OpenSSL.org.

30 *

31 * 5. Products derived from this software may not be called "OpenSSL"

32 * nor may "OpenSSL" appear in their names without prior written

33 * permission of the OpenSSL Project.

34 *

35 * 6. Redistributions of any form whatsoever must retain the following

36 * acknowledgment:

37 * "This product includes software developed by the OpenSSL Project

38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"

39 *

40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR

44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

51 * OF THE POSSIBILITY OF SUCH DAMAGE.

52 * ====================================================================

53 *

54 * This product includes cryptographic software written by Eric Young

55 * (eay@cryptsoft.com). This product includes software written by Tim

56 * Hudson (tjh@cryptsoft.com).

57 *

58 */

59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

60 * All rights reserved.

61 *

62 * This package is an SSL implementation written

63 * by Eric Young (eay@cryptsoft.com).

64 * The implementation was written so as to conform with Netscapes SSL.

65 *

66 * This library is free for commercial and non-commercial use as long as

67 * the following conditions are aheared to. The following conditions

68 * apply to all code found in this distribution, be it the RC4, RSA,

69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation

70 * included with this distribution is covered by the same copyright terms

71 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

72 *

73 * Copyright remains Eric Young's, and as such any Copyright notices in

74 * the code are not to be removed.

75 * If this package is used in a product, Eric Young should be given attribution

76 * as the author of the parts of the library used.

77 * This can be in the form of a textual message at program startup or

78 * in documentation (online or textual) provided with the package.

79 *

80 * Redistribution and use in source and binary forms, with or without

81 * modification, are permitted provided that the following conditions

82 * are met:

83 * 1. Redistributions of source code must retain the copyright

84 * notice, this list of conditions and the following disclaimer.

85 * 2. Redistributions in binary form must reproduce the above copyright

86 * notice, this list of conditions and the following disclaimer in the

87 * documentation and/or other materials provided with the distribution.

88 * 3. All advertising materials mentioning features or use of this software

89 * must display the following acknowledgement:

90 * "This product includes cryptographic software written by

91 * Eric Young (eay@cryptsoft.com)"

92 * The word 'cryptographic' can be left out if the rouines from the library

93 * being used are not cryptographic related :-).

94 * 4. If you include any Windows specific code (or a derivative thereof) from

95 * the apps directory (application code) you must include an acknowledgement:

96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

97 *

98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

101 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

108 * SUCH DAMAGE.

109 *

110 * The licence and distribution terms for any publically available version or

111 * derivative of this code cannot be changed. i.e. this code cannot simply be

112 * copied and put under another distribution licence

113 * [including the GNU Public Licence.]

114 */

115

116 #include <stdio.h>

117 #include "ssl_locl.h"

118 #ifndef OPENSSL_NO_KRB5

119 #include "kssl_lcl.h"

120 #endif

121 #include <openssl/buffer.h>

122 #include <openssl/rand.h>

123 #include <openssl/objects.h>

124 #include <openssl/evp.h>

125 #include <openssl/md5.h>

126 #include <openssl/bn.h>

127 #ifndef OPENSSL_NO_DH

128 #include <openssl/dh.h>

129 #endif

130

131 static const SSL_METHOD *dtls1_get_client_method(int ver);

132 static int dtls1_get_hello_verify(SSL *s);

133

134 static const SSL_METHOD *dtls1_get_client_method(int ver)

135 {

136 if (ver == DTLS1_VERSION \|\| ver == DTLS1_BAD_VER)

137 return(DTLSv1_client_method());

138 else

139 return(NULL);

140 }

141

142 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,

143 ssl_undefined_function,

144 dtls1_connect,

145 dtls1_get_client_method)

146

147 int dtls1_connect(SSL *s)

148 {

149 BUF_MEM *buf=NULL;

150 unsigned long Time=(unsigned long)time(NULL);

151 void (cb)(const SSL ssl,int type,int val)=NULL;

152 int ret= -1;

153 int new_state,state,skip=0;

154 #ifndef OPENSSL_NO_SCTP

155 unsigned char sctpauthkey[64];

156 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];

157 #endif

158

159 RAND_add(&Time,sizeof(Time),0);

160 ERR_clear_error();

161 clear_sys_error();

162

163 if (s->info_callback != NULL)

164 cb=s->info_callback;

165 else if (s->ctx->info_callback != NULL)

166 cb=s->ctx->info_callback;

167

168 s->in_handshake++;

169 if (!SSL_in_init(s) \|\| SSL_in_before(s)) SSL_clear(s);

170

171 #ifndef OPENSSL_NO_SCTP

172 /* Notify SCTP BIO socket to enter handshake

173 * mode and prevent stream identifier other

174 * than 0. Will be ignored if no SCTP is used.

175 */

176 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_ha ndshake, NULL);

177 #endif

178

179 #ifndef OPENSSL_NO_HEARTBEATS

180 /* If we're awaiting a HeartbeatResponse, pretend we

181 * already got and don't await it anymore, because

182 * Heartbeats don't make sense during handshakes anyway.

183 */

184 if (s->tlsext_hb_pending)

185 {

186 dtls1_stop_timer(s);

187 s->tlsext_hb_pending = 0;

188 s->tlsext_hb_seq++;

189 }

190 #endif

191

192 for (;;)

193 {

194 state=s->state;

195

196 switch(s->state)

197 {

198 case SSL_ST_RENEGOTIATE:

199 s->renegotiate=1;

200 s->state=SSL_ST_CONNECT;

201 s->ctx->stats.sess_connect_renegotiate++;

202 /* break */

203 case SSL_ST_BEFORE:

204 case SSL_ST_CONNECT:

205 case SSL_ST_BEFORE\|SSL_ST_CONNECT:

206 case SSL_ST_OK\|SSL_ST_CONNECT:

207

208 s->server=0;

209 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);

210

211 if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) & &

212 (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))

213 {

214 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR );

215 ret = -1;

216 goto end;

217 }

218

219 /* s->version=SSL3_VERSION; */

220 s->type=SSL_ST_CONNECT;

221

222 if (s->init_buf == NULL)

223 {

224 if ((buf=BUF_MEM_new()) == NULL)

225 {

226 ret= -1;

227 goto end;

228 }

229 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))

230 {

231 ret= -1;

232 goto end;

233 }

234 s->init_buf=buf;

235 buf=NULL;

236 }

237

238 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }

239

240 /* setup buffing BIO */

241 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }

242

243 /* don't push the buffering BIO quite yet */

244

245 s->state=SSL3_ST_CW_CLNT_HELLO_A;

246 s->ctx->stats.sess_connect++;

247 s->init_num=0;

248 /* mark client_random uninitialized */

249 memset(s->s3->client_random,0,sizeof(s->s3->client_rando m));

250 s->d1->send_cookie = 0;

251 s->hit = 0;

252 break;

253

254 #ifndef OPENSSL_NO_SCTP

255 case DTLS1_SCTP_ST_CR_READ_SOCK:

256

257 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))

258 {

259 s->s3->in_read_app_data=2;

260 s->rwstate=SSL_READING;

261 BIO_clear_retry_flags(SSL_get_rbio(s));

262 BIO_set_retry_read(SSL_get_rbio(s));

263 ret = -1;

264 goto end;

265 }

266

267 s->state=s->s3->tmp.next_state;

268 break;

269

270 case DTLS1_SCTP_ST_CW_WRITE_SOCK:

271 /* read app data until dry event */

272

273 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));

274 if (ret < 0) goto end;

275

276 if (ret == 0)

277 {

278 s->s3->in_read_app_data=2;

279 s->rwstate=SSL_READING;

280 BIO_clear_retry_flags(SSL_get_rbio(s));

281 BIO_set_retry_read(SSL_get_rbio(s));

282 ret = -1;

283 goto end;

284 }

285

286 s->state=s->d1->next_state;

287 break;

288 #endif

289

290 case SSL3_ST_CW_CLNT_HELLO_A:

291 case SSL3_ST_CW_CLNT_HELLO_B:

292

293 s->shutdown=0;

294

295 /* every DTLS ClientHello resets Finished MAC */

296 ssl3_init_finished_mac(s);

297

298 dtls1_start_timer(s);

299 ret=dtls1_client_hello(s);

300 if (ret <= 0) goto end;

301

302 if ( s->d1->send_cookie)

303 {

304 s->state=SSL3_ST_CW_FLUSH;

305 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;

306 }

307 else

308 s->state=SSL3_ST_CR_SRVR_HELLO_A;

309

310 s->init_num=0;

311

312 #ifndef OPENSSL_NO_SCTP

313 /* Disable buffering for SCTP */

314 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))

315 {

316 #endif

317 /* turn on buffering for the next lot of output */

318 if (s->bbio != s->wbio)

319 s->wbio=BIO_push(s->bbio,s->wbio);

320 #ifndef OPENSSL_NO_SCTP

321 }

322 #endif

323

324 break;

325

326 case SSL3_ST_CR_SRVR_HELLO_A:

327 case SSL3_ST_CR_SRVR_HELLO_B:

328 ret=ssl3_get_server_hello(s);

329 if (ret <= 0) goto end;

330 else

331 {

332 if (s->hit)

333 {

334 #ifndef OPENSSL_NO_SCTP

335 /* Add new shared key for SCTP-Auth,

336 * will be ignored if no SCTP used.

337 */

338 snprintf((char*) labelbuffer, sizeof(DTL S1_SCTP_AUTH_LABEL),

339 DTLS1_SCTP_AUTH_LABEL);

340

341 SSL_export_keying_material(s, sctpauthke y,

342 sizeof(sctpau thkey), labelbuffer,

343 sizeof(labelb uffer), NULL, 0, 0);

344

345 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM _SCTP_ADD_AUTH_KEY,

346 sizeof(sctpauthkey), sc tpauthkey);

347 #endif

348

349 s->state=SSL3_ST_CR_FINISHED_A;

350 }

351 else

352 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUES T_A;

353 }

354 s->init_num=0;

355 break;

356

357 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:

358 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:

359

360 ret = dtls1_get_hello_verify(s);

361 if ( ret <= 0)

362 goto end;

363 dtls1_stop_timer(s);

364 if ( s->d1->send_cookie) /* start again, with a cookie * /

365 s->state=SSL3_ST_CW_CLNT_HELLO_A;

366 else

367 s->state = SSL3_ST_CR_CERT_A;

368 s->init_num = 0;

369 break;

370

371 case SSL3_ST_CR_CERT_A:

372 case SSL3_ST_CR_CERT_B:

373 #ifndef OPENSSL_NO_TLSEXT

374 ret=ssl3_check_finished(s);

375 if (ret <= 0) goto end;

376 if (ret == 2)

377 {

378 s->hit = 1;

379 if (s->tlsext_ticket_expected)

380 s->state=SSL3_ST_CR_SESSION_TICKET_A;

381 else

382 s->state=SSL3_ST_CR_FINISHED_A;

383 s->init_num=0;

384 break;

385 }

386 #endif

387 /* Check if it is anon DH or PSK */

388 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&

389 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))

390 {

391 ret=ssl3_get_server_certificate(s);

392 if (ret <= 0) goto end;

393 #ifndef OPENSSL_NO_TLSEXT

394 if (s->tlsext_status_expected)

395 s->state=SSL3_ST_CR_CERT_STATUS_A;

396 else

397 s->state=SSL3_ST_CR_KEY_EXCH_A;

398 }

399 else

400 {

401 skip = 1;

402 s->state=SSL3_ST_CR_KEY_EXCH_A;

403 }

404 #else

405 }

406 else

407 skip=1;

408

409 s->state=SSL3_ST_CR_KEY_EXCH_A;

410 #endif

411 s->init_num=0;

412 break;

413

414 case SSL3_ST_CR_KEY_EXCH_A:

415 case SSL3_ST_CR_KEY_EXCH_B:

416 ret=ssl3_get_key_exchange(s);

417 if (ret <= 0) goto end;

418 s->state=SSL3_ST_CR_CERT_REQ_A;

419 s->init_num=0;

420

421 /* at this point we check that we have the

422 * required stuff from the server */

423 if (!ssl3_check_cert_and_algorithm(s))

424 {

425 ret= -1;

426 goto end;

427 }

428 break;

429

430 case SSL3_ST_CR_CERT_REQ_A:

431 case SSL3_ST_CR_CERT_REQ_B:

432 ret=ssl3_get_certificate_request(s);

433 if (ret <= 0) goto end;

434 s->state=SSL3_ST_CR_SRVR_DONE_A;

435 s->init_num=0;

436 break;

437

438 case SSL3_ST_CR_SRVR_DONE_A:

439 case SSL3_ST_CR_SRVR_DONE_B:

440 ret=ssl3_get_server_done(s);

441 if (ret <= 0) goto end;

442 dtls1_stop_timer(s);

443 if (s->s3->tmp.cert_req)

444 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;

445 else

446 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;

447 s->init_num=0;

448

449 #ifndef OPENSSL_NO_SCTP

450 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&

451 state == SSL_ST_RENEGOTIATE)

452 s->state=DTLS1_SCTP_ST_CR_READ_SOCK;

453 else

454 #endif

455 s->state=s->s3->tmp.next_state;

456 break;

457

458 case SSL3_ST_CW_CERT_A:

459 case SSL3_ST_CW_CERT_B:

460 case SSL3_ST_CW_CERT_C:

461 case SSL3_ST_CW_CERT_D:

462 dtls1_start_timer(s);

463 ret=dtls1_send_client_certificate(s);

464 if (ret <= 0) goto end;

465 s->state=SSL3_ST_CW_KEY_EXCH_A;

466 s->init_num=0;

467 break;

468

469 case SSL3_ST_CW_KEY_EXCH_A:

470 case SSL3_ST_CW_KEY_EXCH_B:

471 dtls1_start_timer(s);

472 ret=dtls1_send_client_key_exchange(s);

473 if (ret <= 0) goto end;

474

475 #ifndef OPENSSL_NO_SCTP

476 /* Add new shared key for SCTP-Auth,

477 * will be ignored if no SCTP used.

478 */

479 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LAB EL),

480 DTLS1_SCTP_AUTH_LABEL);

481

482 SSL_export_keying_material(s, sctpauthkey,

483 sizeof(sctpauthkey), labelbuf fer,

484 sizeof(labelbuffer), NULL, 0, 0);

485

486 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_K EY,

487 sizeof(sctpauthkey), sctpauthkey);

488 #endif

489

490 /* EAY EAY EAY need to check for DH fix cert

491 * sent back */

492 /* For TLS, cert_req is set to 2, so a cert chain

493 * of nothing is sent, but no verify packet is sent */

494 if (s->s3->tmp.cert_req == 1)

495 {

496 s->state=SSL3_ST_CW_CERT_VRFY_A;

497 }

498 else

499 {

500 #ifndef OPENSSL_NO_SCTP

501 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))

502 {

503 s->d1->next_state=SSL3_ST_CW_CHANGE_A;

504 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;

505 }

506 else

507 #endif

508 s->state=SSL3_ST_CW_CHANGE_A;

509 s->s3->change_cipher_spec=0;

510 }

511

512 s->init_num=0;

513 break;

514

515 case SSL3_ST_CW_CERT_VRFY_A:

516 case SSL3_ST_CW_CERT_VRFY_B:

517 dtls1_start_timer(s);

518 ret=dtls1_send_client_verify(s);

519 if (ret <= 0) goto end;

520 #ifndef OPENSSL_NO_SCTP

521 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))

522 {

523 s->d1->next_state=SSL3_ST_CW_CHANGE_A;

524 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;

525 }

526 else

527 #endif

528 s->state=SSL3_ST_CW_CHANGE_A;

529 s->init_num=0;

530 s->s3->change_cipher_spec=0;

531 break;

532

533 case SSL3_ST_CW_CHANGE_A:

534 case SSL3_ST_CW_CHANGE_B:

535 if (!s->hit)

536 dtls1_start_timer(s);

537 ret=dtls1_send_change_cipher_spec(s,

538 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);

539 if (ret <= 0) goto end;

540

541 #ifndef OPENSSL_NO_SCTP

542 /* Change to new shared key of SCTP-Auth,

543 * will be ignored if no SCTP used.

544 */

545 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_ KEY, 0, NULL);

546 #endif

547

548 s->state=SSL3_ST_CW_FINISHED_A;

549 s->init_num=0;

550

551 s->session->cipher=s->s3->tmp.new_cipher;

552 #ifdef OPENSSL_NO_COMP

553 s->session->compress_meth=0;

554 #else

555 if (s->s3->tmp.new_compression == NULL)

556 s->session->compress_meth=0;

557 else

558 s->session->compress_meth=

559 s->s3->tmp.new_compression->id;

560 #endif

561 if (!s->method->ssl3_enc->setup_key_block(s))

562 {

563 ret= -1;

564 goto end;

565 }

566

567 if (!s->method->ssl3_enc->change_cipher_state(s,

568 SSL3_CHANGE_CIPHER_CLIENT_WRITE))

569 {

570 ret= -1;

571 goto end;

572 }

573

574 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);

575 break;

576

577 case SSL3_ST_CW_FINISHED_A:

578 case SSL3_ST_CW_FINISHED_B:

579 if (!s->hit)

580 dtls1_start_timer(s);

581 ret=dtls1_send_finished(s,

582 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,

583 s->method->ssl3_enc->client_finished_label,

584 s->method->ssl3_enc->client_finished_label_len);

585 if (ret <= 0) goto end;

586 s->state=SSL3_ST_CW_FLUSH;

587

588 /* clear flags */

589 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;

590 if (s->hit)

591 {

592 s->s3->tmp.next_state=SSL_ST_OK;

593 #ifndef OPENSSL_NO_SCTP

594 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))

595 {

596 s->d1->next_state = s->s3->tmp.n ext_state;

597 s->s3->tmp.next_state=DTLS1_SCTP _ST_CW_WRITE_SOCK;

598 }

599 #endif

600 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINIS HED)

601 {

602 s->state=SSL_ST_OK;

603 #ifndef OPENSSL_NO_SCTP

604 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))

605 {

606 s->d1->next_state = SSL_ ST_OK;

607 s->state=DTLS1_SCTP_ST_C W_WRITE_SOCK;

608 }

609 #endif

610 s->s3->flags\|=SSL3_FLAGS_POP_BUFFER;

611 s->s3->delay_buf_pop_ret=0;

612 }

613 }

614 else

615 {

616 #ifndef OPENSSL_NO_TLSEXT

617 /* Allow NewSessionTicket if ticket expected */

618 if (s->tlsext_ticket_expected)

619 s->s3->tmp.next_state=SSL3_ST_CR_SESSION _TICKET_A;

620 else

621 #endif

622

623 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;

624 }

625 s->init_num=0;

626 break;

627

628 #ifndef OPENSSL_NO_TLSEXT

629 case SSL3_ST_CR_SESSION_TICKET_A:

630 case SSL3_ST_CR_SESSION_TICKET_B:

631 ret=ssl3_get_new_session_ticket(s);

632 if (ret <= 0) goto end;

633 s->state=SSL3_ST_CR_FINISHED_A;

634 s->init_num=0;

635 break;

636

637 case SSL3_ST_CR_CERT_STATUS_A:

638 case SSL3_ST_CR_CERT_STATUS_B:

639 ret=ssl3_get_cert_status(s);

640 if (ret <= 0) goto end;

641 s->state=SSL3_ST_CR_KEY_EXCH_A;

642 s->init_num=0;

643 break;

644 #endif

645

646 case SSL3_ST_CR_FINISHED_A:

647 case SSL3_ST_CR_FINISHED_B:

648 s->d1->change_cipher_spec_ok = 1;

649 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,

650 SSL3_ST_CR_FINISHED_B);

651 if (ret <= 0) goto end;

652 dtls1_stop_timer(s);

653

654 if (s->hit)

655 s->state=SSL3_ST_CW_CHANGE_A;

656 else

657 s->state=SSL_ST_OK;

658

659 #ifndef OPENSSL_NO_SCTP

660 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&

661 state == SSL_ST_RENEGOTIATE)

662 {

663 s->d1->next_state=s->state;

664 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;

665 }

666 #endif

667

668 s->init_num=0;

669 break;

670

671 case SSL3_ST_CW_FLUSH:

672 s->rwstate=SSL_WRITING;

673 if (BIO_flush(s->wbio) <= 0)

674 {

675 /* If the write error was fatal, stop trying */

676 if (!BIO_should_retry(s->wbio))

677 {

678 s->rwstate=SSL_NOTHING;

679 s->state=s->s3->tmp.next_state;

680 }

681

682 ret= -1;

683 goto end;

684 }

685 s->rwstate=SSL_NOTHING;

686 s->state=s->s3->tmp.next_state;

687 break;

688

689 case SSL_ST_OK:

690 /* clean a few things up */

691 ssl3_cleanup_key_block(s);

692

693 #if 0

694 if (s->init_buf != NULL)

695 {

696 BUF_MEM_free(s->init_buf);

697 s->init_buf=NULL;

698 }

699 #endif

700

701 /* If we are not 'joining' the last two packets,

702 * remove the buffering now */

703 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))

704 ssl_free_wbio_buffer(s);

705 /* else do it later in ssl3_write */

706

707 s->init_num=0;

708 s->renegotiate=0;

709 s->new_session=0;

710

711 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);

712 if (s->hit) s->ctx->stats.sess_hit++;

713

714 ret=1;

715 /* s->server=0; */

716 s->handshake_func=dtls1_connect;

717 s->ctx->stats.sess_connect_good++;

718

719 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);

720

721 /* done with handshaking */

722 s->d1->handshake_read_seq = 0;

723 s->d1->next_handshake_write_seq = 0;

724 goto end;

725 /* break; */

726

727 default:

728 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);

729 ret= -1;

730 goto end;

731 /* break; */

732 }

733

734 /* did we do anything */

735 if (!s->s3->tmp.reuse_message && !skip)

736 {

737 if (s->debug)

738 {

739 if ((ret=BIO_flush(s->wbio)) <= 0)

740 goto end;

741 }

742

743 if ((cb != NULL) && (s->state != state))

744 {

745 new_state=s->state;

746 s->state=state;

747 cb(s,SSL_CB_CONNECT_LOOP,1);

748 s->state=new_state;

749 }

750 }

751 skip=0;

752 }

753 end:

754 s->in_handshake--;

755

756 #ifndef OPENSSL_NO_SCTP

757 /* Notify SCTP BIO socket to leave handshake

758 * mode and allow stream identifier other

759 * than 0. Will be ignored if no SCTP is used.

760 */

761 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_ha ndshake, NULL);

762 #endif

763

764 if (buf != NULL)

765 BUF_MEM_free(buf);

766 if (cb != NULL)

767 cb(s,SSL_CB_CONNECT_EXIT,ret);

768 return(ret);

769 }

770

771 int dtls1_client_hello(SSL *s)

772 {

773 unsigned char *buf;

774 unsigned char p,d;

775 unsigned int i,j;

776 unsigned long Time,l;

777 SSL_COMP *comp;

778

779 buf=(unsigned char *)s->init_buf->data;

780 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)

781 {

782 SSL_SESSION *sess = s->session;

783 if ((s->session == NULL) \|\|

784 (s->session->ssl_version != s->version) \|\|

785 #ifdef OPENSSL_NO_TLSEXT

786 !sess->session_id_length \|\|

787 #else

788 (!sess->session_id_length && !sess->tlsext_tick) \|\|

789 #endif

790 (s->session->not_resumable))

791 {

792 if (!s->session_creation_enabled)

793 {

794 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE _FAILURE);

795 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_SESSION_MA Y_NOT_BE_CREATED);

796 goto err;

797 }

798 if (!ssl_get_new_session(s,0))

799 goto err;

800 }

801 /* else use the pre-loaded session */

802

803 p=s->s3->client_random;

804

805 /* if client_random is initialized, reuse it, we are

806 * required to use same upon reply to HelloVerify */

807 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;

808 if (i==sizeof(s->s3->client_random))

809 {

810 Time=(unsigned long)time(NULL); /* Time */

811 l2n(Time,p);

812 RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);

813 }

814

815 /* Do the message type and length last */

816 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);

817

818 *(p++)=s->version>>8;

819 *(p++)=s->version&0xff;

820 s->client_version=s->version;

821

822 /* Random stuff */

823 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);

824 p+=SSL3_RANDOM_SIZE;

825

826 /* Session ID */

827 if (s->new_session)

828 i=0;

829 else

830 i=s->session->session_id_length;

831 *(p++)=i;

832 if (i != 0)

833 {

834 if (i > sizeof s->session->session_id)

835 {

836 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ ERROR);

837 goto err;

838 }

839 memcpy(p,s->session->session_id,i);

840 p+=i;

841 }

842

843 /* cookie stuff */

844 if ( s->d1->cookie_len > sizeof(s->d1->cookie))

845 {

846 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);

847 goto err;

848 }

849 *(p++) = s->d1->cookie_len;

850 memcpy(p, s->d1->cookie, s->d1->cookie_len);

851 p += s->d1->cookie_len;

852

853 /* Ciphers supported */

854 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);

855 if (i == 0)

856 {

857 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILAB LE);

858 goto err;

859 }

860 s2n(i,p);

861 p+=i;

862

863 /* COMPRESSION */

864 if (s->ctx->comp_methods == NULL)

865 j=0;

866 else

867 j=sk_SSL_COMP_num(s->ctx->comp_methods);

868 *(p++)=1+j;

869 for (i=0; i<j; i++)

870 {

871 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);

872 *(p++)=comp->id;

873 }

874 (p++)=0; / Add the NULL method */

875

876 #ifndef OPENSSL_NO_TLSEXT

877 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_ LENGTH, 0)) == NULL)

878 {

879 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);

880 goto err;

881 }

882 #endif

883

884 l=(p-d);

885 d=buf;

886

887 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l );

888

889 s->state=SSL3_ST_CW_CLNT_HELLO_B;

890 /* number of bytes to write */

891 s->init_num=p-buf;

892 s->init_off=0;

893

894 /* buffer the message to handle re-xmits */

895 dtls1_buffer_message(s, 0);

896 }

897

898 /* SSL3_ST_CW_CLNT_HELLO_B */

899 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));

900 err:

901 return(-1);

902 }

903

904 static int dtls1_get_hello_verify(SSL *s)

905 {

906 int n, al, ok = 0;

907 unsigned char *data;

908 unsigned int cookie_len;

909

910 n=s->method->ssl_get_message(s,

911 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,

912 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,

913 -1,

914 s->max_cert_list,

915 &ok);

916

917 if (!ok) return((int)n);

918

919 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)

920 {

921 s->d1->send_cookie = 0;

922 s->s3->tmp.reuse_message=1;

923 return(1);

924 }

925

926 data = (unsigned char *)s->init_msg;

927

928 if ((data[0] != (s->version>>8)) \|\| (data[1] != (s->version&0xff)))

929 {

930 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);

931 s->version=(s->version&0xff00)\|data[1];

932 al = SSL_AD_PROTOCOL_VERSION;

933 goto f_err;

934 }

935 data+=2;

936

937 cookie_len = *(data++);

938 if ( cookie_len > sizeof(s->d1->cookie))

939 {

940 al=SSL_AD_ILLEGAL_PARAMETER;

941 goto f_err;

942 }

943

944 memcpy(s->d1->cookie, data, cookie_len);

945 s->d1->cookie_len = cookie_len;

946

947 s->d1->send_cookie = 1;

948 return 1;

949

950 f_err:

951 ssl3_send_alert(s, SSL3_AL_FATAL, al);

952 return -1;

953 }

954

955 int dtls1_send_client_key_exchange(SSL *s)

956 {

957 unsigned char p,d;

958 int n;

959 unsigned long alg_k;

960 #ifndef OPENSSL_NO_RSA

961 unsigned char *q;

962 EVP_PKEY *pkey=NULL;

963 #endif

964 #ifndef OPENSSL_NO_KRB5

965 KSSL_ERR kssl_err;

966 #endif /* OPENSSL_NO_KRB5 */

967 #ifndef OPENSSL_NO_ECDH

968 EC_KEY *clnt_ecdh = NULL;

969 const EC_POINT *srvr_ecpoint = NULL;

970 EVP_PKEY *srvr_pub_pkey = NULL;

971 unsigned char *encodedPoint = NULL;

972 int encoded_pt_len = 0;

973 BN_CTX * bn_ctx = NULL;

974 #endif

975

976 if (s->state == SSL3_ST_CW_KEY_EXCH_A)

977 {

978 d=(unsigned char *)s->init_buf->data;

979 p= &(d[DTLS1_HM_HEADER_LENGTH]);

980

981 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;

982

983 /* Fool emacs indentation */

984 if (0) {}

985 #ifndef OPENSSL_NO_RSA

986 else if (alg_k & SSL_kRSA)

987 {

988 RSA *rsa;

989 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];

990

991 if (s->session->sess_cert->peer_rsa_tmp != NULL)

992 rsa=s->session->sess_cert->peer_rsa_tmp;

993 else

994 {

995 pkey=X509_get_pubkey(s->session->sess_cert->peer _pkeys[SSL_PKEY_RSA_ENC].x509);

996 if ((pkey == NULL) \|\|

997 (pkey->type != EVP_PKEY_RSA) \|\|

998 (pkey->pkey.rsa == NULL))

999 {

1000 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHA NGE,ERR_R_INTERNAL_ERROR);

1001 goto err;

1002 }

1003 rsa=pkey->pkey.rsa;

1004 EVP_PKEY_free(pkey);

1005 }

1006

1007 tmp_buf[0]=s->client_version>>8;

1008 tmp_buf[1]=s->client_version&0xff;

1009 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)

1010 goto err;

1011

1012 s->session->master_key_length=sizeof tmp_buf;

1013

1014 q=p;

1015 /* Fix buf for TLS and [incidentally] DTLS */

1016 if (s->version > SSL3_VERSION)

1017 p+=2;

1018 n=RSA_public_encrypt(sizeof tmp_buf,

1019 tmp_buf,p,rsa,RSA_PKCS1_PADDING);

1020 #ifdef PKCS1_CHECK

1021 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;

1022 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;

1023 #endif

1024 if (n <= 0)

1025 {

1026 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_ R_BAD_RSA_ENCRYPT);

1027 goto err;

1028 }

1029

1030 /* Fix buf for TLS and [incidentally] DTLS */

1031 if (s->version > SSL3_VERSION)

1032 {

1033 s2n(n,q);

1034 n+=2;

1035 }

1036

1037 s->session->master_key_length=

1038 s->method->ssl3_enc->generate_master_secret(s,

1039 s->session->master_key,

1040 tmp_buf,sizeof tmp_buf);

1041 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);

1042 }

1043 #endif

1044 #ifndef OPENSSL_NO_KRB5

1045 else if (alg_k & SSL_kKRB5)

1046 {

1047 krb5_error_code krb5rc;

1048 KSSL_CTX *kssl_ctx = s->kssl_ctx;

1049 /* krb5_data krb5_ap_req; */

1050 krb5_data *enc_ticket;

1051 krb5_data authenticator, *authp = NULL;

1052 EVP_CIPHER_CTX ciph_ctx;

1053 const EVP_CIPHER *enc = NULL;

1054 unsigned char iv[EVP_MAX_IV_LENGTH];

1055 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];

1056 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH

1057 + EVP_MAX_IV_LENGTH];

1058 int padl, outl = sizeof(epms);

1059

1060 EVP_CIPHER_CTX_init(&ciph_ctx);

1061

1062 #ifdef KSSL_DEBUG

1063 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",

1064 alg_k, SSL_kKRB5);

1065 #endif /* KSSL_DEBUG */

1066

1067 authp = NULL;

1068 #ifdef KRB5SENDAUTH

1069 if (KRB5SENDAUTH) authp = &authenticator;

1070 #endif /* KRB5SENDAUTH */

1071

1072 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,

1073 &kssl_err);

1074 enc = kssl_map_enc(kssl_ctx->enctype);

1075 if (enc == NULL)

1076 goto err;

1077 #ifdef KSSL_DEBUG

1078 {

1079 printf("kssl_cget_tkt rtn %d\n", krb5rc);

1080 if (krb5rc && kssl_err.text)

1081 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);

1082 }

1083 #endif /* KSSL_DEBUG */

1084

1085 if (krb5rc)

1086 {

1087 ssl3_send_alert(s,SSL3_AL_FATAL,

1088 SSL_AD_HANDSHAKE_FAILURE);

1089 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,

1090 kssl_err.reason);

1091 goto err;

1092 }

1093

1094 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ

1095 ** in place of RFC 2712 KerberosWrapper, as in:

1096 **

1097 ** Send ticket (copy to *p, set n = length)

1098 ** n = krb5_ap_req.length;

1099 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);

1100 ** if (krb5_ap_req.data)

1101 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);

1102 **

1103 ** Now using real RFC 2712 KerberosWrapper

1104 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)

1105 ** Note: 2712 "opaque" types are here replaced

1106 ** with a 2-byte length followed by the value.

1107 ** Example:

1108 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms

1109 ** Where "xx xx" = length bytes. Shown here with

1110 ** optional authenticator omitted.

1111 */

1112

1113 /* KerberosWrapper.Ticket */

1114 s2n(enc_ticket->length,p);

1115 memcpy(p, enc_ticket->data, enc_ticket->length);

1116 p+= enc_ticket->length;

1117 n = enc_ticket->length + 2;

1118

1119 /* KerberosWrapper.Authenticator */

1120 if (authp && authp->length)

1121 {

1122 s2n(authp->length,p);

1123 memcpy(p, authp->data, authp->length);

1124 p+= authp->length;

1125 n+= authp->length + 2;

1126

1127 free(authp->data);

1128 authp->data = NULL;

1129 authp->length = 0;

1130 }

1131 else

1132 {

1133 s2n(0,p);/* null authenticator length */

1134 n+=2;

1135 }

1136

1137 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)

1138 goto err;

1139

1140 /* 20010420 VRS. Tried it this way; failed.

1141 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);

1142 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,

1143 ** kssl_ctx->length);

1144 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);

1145 */

1146

1147 memset(iv, 0, sizeof iv); /* per RFC 1510 */

1148 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,

1149 kssl_ctx->key,iv);

1150 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,

1151 sizeof tmp_buf);

1152 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);

1153 outl += padl;

1154 if (outl > (int)sizeof epms)

1155 {

1156 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR _R_INTERNAL_ERROR);

1157 goto err;

1158 }

1159 EVP_CIPHER_CTX_cleanup(&ciph_ctx);

1160

1161 /* KerberosWrapper.EncryptedPreMasterSecret */

1162 s2n(outl,p);

1163 memcpy(p, epms, outl);

1164 p+=outl;

1165 n+=outl + 2;

1166

1167 s->session->master_key_length=

1168 s->method->ssl3_enc->generate_master_secret(s,

1169 s->session->master_key,

1170 tmp_buf, sizeof tmp_buf);

1171

1172 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);

1173 OPENSSL_cleanse(epms, outl);

1174 }

1175 #endif

1176 #ifndef OPENSSL_NO_DH

1177 else if (alg_k & (SSL_kEDH\|SSL_kDHr\|SSL_kDHd))

1178 {

1179 DH dh_srvr,dh_clnt;

1180

1181 if (s->session->sess_cert->peer_dh_tmp != NULL)

1182 dh_srvr=s->session->sess_cert->peer_dh_tmp;

1183 else

1184 {

1185 /* we get them from the cert */

1186 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE _FAILURE);

1187 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_ R_UNABLE_TO_FIND_DH_PARAMETERS);

1188 goto err;

1189 }

1190

1191 /* generate a new random key */

1192 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)

1193 {

1194 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_ R_DH_LIB);

1195 goto err;

1196 }

1197 if (!DH_generate_key(dh_clnt))

1198 {

1199 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_ R_DH_LIB);

1200 goto err;

1201 }

1202

1203 /* use the 'p' output buffer for the DH key, but

1204 * make sure to clear it out afterwards */

1205

1206 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);

1207

1208 if (n <= 0)

1209 {

1210 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_ R_DH_LIB);

1211 goto err;

1212 }

1213

1214 /* generate master key from the result */

1215 s->session->master_key_length=

1216 s->method->ssl3_enc->generate_master_secret(s,

1217 s->session->master_key,p,n);

1218 /* clean up */

1219 memset(p,0,n);

1220

1221 /* send off the data */

1222 n=BN_num_bytes(dh_clnt->pub_key);

1223 s2n(n,p);

1224 BN_bn2bin(dh_clnt->pub_key,p);

1225 n+=2;

1226

1227 DH_free(dh_clnt);

1228

1229 /* perhaps clean things up a bit EAY EAY EAY EAY*/

1230 }

1231 #endif

1232 #ifndef OPENSSL_NO_ECDH

1233 else if (alg_k & (SSL_kEECDH\|SSL_kECDHr\|SSL_kECDHe))

1234 {

1235 const EC_GROUP *srvr_group = NULL;

1236 EC_KEY *tkey;

1237 int ecdh_clnt_cert = 0;

1238 int field_size = 0;

1239

1240 /* Did we send out the client's

1241 * ECDH share for use in premaster

1242 * computation as part of client certificate?

1243 * If so, set ecdh_clnt_cert to 1.

1244 */

1245 if ((alg_k & (SSL_kECDHr\|SSL_kECDHe)) && (s->cert != NUL L))

1246 {

1247 /* XXX: For now, we do not support client

1248 * authentication using ECDH certificates.

1249 * To add such support, one needs to add

1250 * code that checks for appropriate

1251 * conditions and sets ecdh_clnt_cert to 1.

1252 * For example, the cert have an ECC

1253 * key on the same curve as the server's

1254 * and the key should be authorized for

1255 * key agreement.

1256 *

1257 * One also needs to add code in ssl3_connect

1258 * to skip sending the certificate verify

1259 * message.

1260 *

1261 * if ((s->cert->key->privatekey != NULL) &&

1262 * (s->cert->key->privatekey->type ==

1263 * EVP_PKEY_EC) && ...)

1264 * ecdh_clnt_cert = 1;

1265 */

1266 }

1267

1268 if (s->session->sess_cert->peer_ecdh_tmp != NULL)

1269 {

1270 tkey = s->session->sess_cert->peer_ecdh_tmp;

1271 }

1272 else

1273 {

1274 /* Get the Server Public Key from Cert */

1275 srvr_pub_pkey = X509_get_pubkey(s->session-> \

1276 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);

1277 if ((srvr_pub_pkey == NULL) \|\|

1278 (srvr_pub_pkey->type != EVP_PKEY_EC) \|\|

1279 (srvr_pub_pkey->pkey.ec == NULL))

1280 {

1281 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHA NGE,

1282 ERR_R_INTERNAL_ERROR);

1283 goto err;

1284 }

1285

1286 tkey = srvr_pub_pkey->pkey.ec;

1287 }

1288

1289 srvr_group = EC_KEY_get0_group(tkey);

1290 srvr_ecpoint = EC_KEY_get0_public_key(tkey);

1291

1292 if ((srvr_group == NULL) \|\| (srvr_ecpoint == NULL))

1293 {

1294 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,

1295 ERR_R_INTERNAL_ERROR);

1296 goto err;

1297 }

1298

1299 if ((clnt_ecdh=EC_KEY_new()) == NULL)

1300 {

1301 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_ R_MALLOC_FAILURE);

1302 goto err;

1303 }

1304

1305 if (!EC_KEY_set_group(clnt_ecdh, srvr_group))

1306 {

1307 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_ R_EC_LIB);

1308 goto err;

1309 }

1310 if (ecdh_clnt_cert)

1311 {

1312 /* Reuse key info from our certificate

1313 * We only need our private key to perform

1314 * the ECDH computation.

1315 */

1316 const BIGNUM *priv_key;

1317 tkey = s->cert->key->privatekey->pkey.ec;

1318 priv_key = EC_KEY_get0_private_key(tkey);

1319 if (priv_key == NULL)

1320 {

1321 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHA NGE,ERR_R_MALLOC_FAILURE);

1322 goto err;

1323 }

1324 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key) )

1325 {

1326 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHA NGE,ERR_R_EC_LIB);

1327 goto err;

1328 }

1329 }

1330 else

1331 {

1332 /* Generate a new ECDH key pair */

1333 if (!(EC_KEY_generate_key(clnt_ecdh)))

1334 {

1335 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHA NGE, ERR_R_ECDH_LIB);

1336 goto err;

1337 }

1338 }

1339

1340 /* use the 'p' output buffer for the ECDH key, but

1341 * make sure to clear it out afterwards

1342 */

1343

1344 field_size = EC_GROUP_get_degree(srvr_group);

1345 if (field_size <= 0)

1346 {

1347 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,

1348 ERR_R_ECDH_LIB);

1349 goto err;

1350 }

1351 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, cl nt_ecdh, NULL);

1352 if (n <= 0)

1353 {

1354 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,

1355 ERR_R_ECDH_LIB);

1356 goto err;

1357 }

1358

1359 /* generate master key from the result */

1360 s->session->master_key_length = s->method->ssl3_enc \

1361 -> generate_master_secret(s,

1362 s->session->master_key,

1363 p, n);

1364

1365 memset(p, 0, n); /* clean up */

1366

1367 if (ecdh_clnt_cert)

1368 {

1369 /* Send empty client key exch message */

1370 n = 0;

1371 }

1372 else

1373 {

1374 /* First check the size of encoding and

1375 * allocate memory accordingly.

1376 */

1377 encoded_pt_len =

1378 EC_POINT_point2oct(srvr_group,

1379 EC_KEY_get0_public_key(clnt_ecdh),

1380 POINT_CONVERSION_UNCOMPRESSED,

1381 NULL, 0, NULL);

1382

1383 encodedPoint = (unsigned char *)

1384 OPENSSL_malloc(encoded_pt_len *

1385 sizeof(unsigned char));

1386 bn_ctx = BN_CTX_new();

1387 if ((encodedPoint == NULL) \|\|

1388 (bn_ctx == NULL))

1389 {

1390 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHA NGE,ERR_R_MALLOC_FAILURE);

1391 goto err;

1392 }

1393

1394 /* Encode the public key */

1395 n = EC_POINT_point2oct(srvr_group,

1396 EC_KEY_get0_public_key(clnt_ecdh),

1397 POINT_CONVERSION_UNCOMPRESSED,

1398 encodedPoint, encoded_pt_len, bn_ctx);

1399

1400 p = n; / length of encoded point */

1401 /* Encoded point will be copied here */

1402 p += 1;

1403 /* copy the point */

1404 memcpy((unsigned char *)p, encodedPoint, n);

1405 /* increment n to account for length field */

1406 n += 1;

1407 }

1408

1409 /* Free allocated memory */

1410 BN_CTX_free(bn_ctx);

1411 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);

1412 if (clnt_ecdh != NULL)

1413 EC_KEY_free(clnt_ecdh);

1414 EVP_PKEY_free(srvr_pub_pkey);

1415 }

1416 #endif /* !OPENSSL_NO_ECDH */

1417

1418 #ifndef OPENSSL_NO_PSK

1419 else if (alg_k & SSL_kPSK)

1420 {

1421 char identity[PSK_MAX_IDENTITY_LEN];

1422 unsigned char *t = NULL;

1423 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];

1424 unsigned int pre_ms_len = 0, psk_len = 0;

1425 int psk_err = 1;

1426

1427 n = 0;

1428 if (s->psk_client_callback == NULL)

1429 {

1430 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,

1431 SSL_R_PSK_NO_CLIENT_CB);

1432 goto err;

1433 }

1434

1435 psk_len = s->psk_client_callback(s, s->ctx->psk_identity _hint,

1436 identity, PSK_MAX_IDENTITY_LEN,

1437 psk_or_pre_ms, sizeof(psk_or_pre_ms));

1438 if (psk_len > PSK_MAX_PSK_LEN)

1439 {

1440 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,

1441 ERR_R_INTERNAL_ERROR);

1442 goto psk_err;

1443 }

1444 else if (psk_len == 0)

1445 {

1446 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,

1447 SSL_R_PSK_IDENTITY_NOT_FOUND);

1448 goto psk_err;

1449 }

1450

1451 /* create PSK pre_master_secret */

1452 pre_ms_len = 2+psk_len+2+psk_len;

1453 t = psk_or_pre_ms;

1454 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len) ;

1455 s2n(psk_len, t);

1456 memset(t, 0, psk_len);

1457 t+=psk_len;

1458 s2n(psk_len, t);

1459

1460 if (s->session->psk_identity_hint != NULL)

1461 OPENSSL_free(s->session->psk_identity_hint);

1462 s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_i dentity_hint);

1463 if (s->ctx->psk_identity_hint != NULL &&

1464 s->session->psk_identity_hint == NULL)

1465 {

1466 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,

1467 ERR_R_MALLOC_FAILURE);

1468 goto psk_err;

1469 }

1470

1471 if (s->session->psk_identity != NULL)

1472 OPENSSL_free(s->session->psk_identity);

1473 s->session->psk_identity = BUF_strdup(identity);

1474 if (s->session->psk_identity == NULL)

1475 {

1476 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,

1477 ERR_R_MALLOC_FAILURE);

1478 goto psk_err;

1479 }

1480

1481 s->session->master_key_length =

1482 s->method->ssl3_enc->generate_master_secret(s,

1483 s->session->master_key,

1484 psk_or_pre_ms, pre_ms_len);

1485 n = strlen(identity);

1486 s2n(n, p);

1487 memcpy(p, identity, n);

1488 n+=2;

1489 psk_err = 0;

1490 psk_err:

1491 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);

1492 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));

1493 if (psk_err != 0)

1494 {

1495 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHA KE_FAILURE);

1496 goto err;

1497 }

1498 }

1499 #endif

1500 else

1501 {

1502 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE );

1503 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERN AL_ERROR);

1504 goto err;

1505 }

1506

1507 d = dtls1_set_message_header(s, d,

1508 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);

1509 /*

1510 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;

1511 l2n3(n,d);

1512 l2n(s->d1->handshake_write_seq,d);

1513 s->d1->handshake_write_seq++;

1514 */

1515

1516 s->state=SSL3_ST_CW_KEY_EXCH_B;

1517 /* number of bytes to write */

1518 s->init_num=n+DTLS1_HM_HEADER_LENGTH;

1519 s->init_off=0;

1520

1521 /* buffer the message to handle re-xmits */

1522 dtls1_buffer_message(s, 0);

1523 }

1524

1525 /* SSL3_ST_CW_KEY_EXCH_B */

1526 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));

1527 err:

1528 #ifndef OPENSSL_NO_ECDH

1529 BN_CTX_free(bn_ctx);

1530 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);

1531 if (clnt_ecdh != NULL)

1532 EC_KEY_free(clnt_ecdh);

1533 EVP_PKEY_free(srvr_pub_pkey);

1534 #endif

1535 return(-1);

1536 }

1537

1538 int dtls1_send_client_verify(SSL *s)

1539 {

1540 unsigned char p,d;

1541 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];

1542 EVP_PKEY *pkey;

1543 #ifndef OPENSSL_NO_RSA

1544 unsigned u=0;

1545 #endif

1546 unsigned long n;

1547 #if !defined(OPENSSL_NO_DSA) \|\| !defined(OPENSSL_NO_ECDSA)

1548 int j;

1549 #endif

1550

1551 if (s->state == SSL3_ST_CW_CERT_VRFY_A)

1552 {

1553 d=(unsigned char *)s->init_buf->data;

1554 p= &(d[DTLS1_HM_HEADER_LENGTH]);

1555 pkey=s->cert->key->privatekey;

1556

1557 s->method->ssl3_enc->cert_verify_mac(s,

1558 NID_sha1,

1559 &(data[MD5_DIGEST_LENGTH]));

1560

1561 #ifndef OPENSSL_NO_RSA

1562 if (pkey->type == EVP_PKEY_RSA)

1563 {

1564 s->method->ssl3_enc->cert_verify_mac(s,

1565 NID_md5,

1566 &(data[0]));

1567 if (RSA_sign(NID_md5_sha1, data,

1568 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,

1569 &(p[2]), &u, pkey->pkey.rsa) <= 0 )

1570 {

1571 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_ LIB);

1572 goto err;

1573 }

1574 s2n(u,p);

1575 n=u+2;

1576 }

1577 else

1578 #endif

1579 #ifndef OPENSSL_NO_DSA

1580 if (pkey->type == EVP_PKEY_DSA)

1581 {

1582 if (!DSA_sign(pkey->save_type,

1583 &(data[MD5_DIGEST_LENGTH]),

1584 SHA_DIGEST_LENGTH,&(p[2]),

1585 (unsigned int *)&j,pkey->pkey.dsa))

1586 {

1587 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_ LIB);

1588 goto err;

1589 }

1590 s2n(j,p);

1591 n=j+2;

1592 }

1593 else

1594 #endif

1595 #ifndef OPENSSL_NO_ECDSA

1596 if (pkey->type == EVP_PKEY_EC)

1597 {

1598 if (!ECDSA_sign(pkey->save_type,

1599 &(data[MD5_DIGEST_LENGTH]),

1600 SHA_DIGEST_LENGTH,&(p[2]),

1601 (unsigned int *)&j,pkey->pkey.ec))

1602 {

1603 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,

1604 ERR_R_ECDSA_LIB);

1605 goto err;

1606 }

1607 s2n(j,p);

1608 n=j+2;

1609 }

1610 else

1611 #endif

1612 {

1613 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERR OR);

1614 goto err;

1615 }

1616

1617 d = dtls1_set_message_header(s, d,

1618 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;

1619

1620 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;

1621 s->init_off=0;

1622

1623 /* buffer the message to handle re-xmits */

1624 dtls1_buffer_message(s, 0);

1625

1626 s->state = SSL3_ST_CW_CERT_VRFY_B;

1627 }

1628

1629 /* s->state = SSL3_ST_CW_CERT_VRFY_B */

1630 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));

1631 err:

1632 return(-1);

1633 }

1634

1635 int dtls1_send_client_certificate(SSL *s)

1636 {

1637 X509 *x509=NULL;

1638 EVP_PKEY *pkey=NULL;

1639 int i;

1640 unsigned long l;

1641

1642 if (s->state == SSL3_ST_CW_CERT_A)

1643 {

1644 if ((s->cert == NULL) \|\|

1645 (s->cert->key->x509 == NULL) \|\|

1646 (s->cert->key->privatekey == NULL))

1647 s->state=SSL3_ST_CW_CERT_B;

1648 else

1649 s->state=SSL3_ST_CW_CERT_C;

1650 }

1651

1652 /* We need to get a client cert */

1653 if (s->state == SSL3_ST_CW_CERT_B)

1654 {

1655 /* If we get an error, we need to

1656 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);

1657 * We then get retied later */

1658 i=0;

1659 i = ssl_do_client_cert_cb(s, &x509, &pkey);

1660 if (i < 0)

1661 {

1662 s->rwstate=SSL_X509_LOOKUP;

1663 return(-1);

1664 }

1665 s->rwstate=SSL_NOTHING;

1666 if ((i == 1) && (pkey != NULL) && (x509 != NULL))

1667 {

1668 s->state=SSL3_ST_CW_CERT_B;

1669 if ( !SSL_use_certificate(s,x509) \|\|

1670 !SSL_use_PrivateKey(s,pkey))

1671 i=0;

1672 }

1673 else if (i == 1)

1674 {

1675 i=0;

1676 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DAT A_RETURNED_BY_CALLBACK);

1677 }

1678

1679 if (x509 != NULL) X509_free(x509);

1680 if (pkey != NULL) EVP_PKEY_free(pkey);

1681 if (i == 0)

1682 {

1683 if (s->version == SSL3_VERSION)

1684 {

1685 s->s3->tmp.cert_req=0;

1686 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERT IFICATE);

1687 return(1);

1688 }

1689 else

1690 {

1691 s->s3->tmp.cert_req=2;

1692 }

1693 }

1694

1695 /* Ok, we have a cert */

1696 s->state=SSL3_ST_CW_CERT_C;

1697 }

1698

1699 if (s->state == SSL3_ST_CW_CERT_C)

1700 {

1701 s->state=SSL3_ST_CW_CERT_D;

1702 l=dtls1_output_cert_chain(s,

1703 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);

1704 s->init_num=(int)l;

1705 s->init_off=0;

1706

1707 /* set header called by dtls1_output_cert_chain() */

1708

1709 /* buffer the message to handle re-xmits */

1710 dtls1_buffer_message(s, 0);

1711 }

1712 /* SSL3_ST_CW_CERT_D */

1713 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));

1714 }

1715

1716

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