Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame^] | 1 | /* ssl/d1_srvr.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 | #include <openssl/buffer.h> |
| 119 | #include <openssl/rand.h> |
| 120 | #include <openssl/objects.h> |
| 121 | #include <openssl/evp.h> |
| 122 | #include <openssl/x509.h> |
| 123 | #include <openssl/md5.h> |
| 124 | #include <openssl/bn.h> |
| 125 | #ifndef OPENSSL_NO_DH |
| 126 | #include <openssl/dh.h> |
| 127 | #endif |
| 128 | |
| 129 | static const SSL_METHOD *dtls1_get_server_method(int ver); |
| 130 | static int dtls1_send_hello_verify_request(SSL *s); |
| 131 | |
| 132 | static const SSL_METHOD *dtls1_get_server_method(int ver) |
| 133 | { |
| 134 | if (ver == DTLS1_VERSION) |
| 135 | return(DTLSv1_server_method()); |
| 136 | else |
| 137 | return(NULL); |
| 138 | } |
| 139 | |
| 140 | IMPLEMENT_dtls1_meth_func(DTLSv1_server_method, |
| 141 | dtls1_accept, |
| 142 | ssl_undefined_function, |
| 143 | dtls1_get_server_method) |
| 144 | |
| 145 | int dtls1_accept(SSL *s) |
| 146 | { |
| 147 | BUF_MEM *buf; |
| 148 | unsigned long Time=(unsigned long)time(NULL); |
| 149 | void (*cb)(const SSL *ssl,int type,int val)=NULL; |
| 150 | unsigned long alg_k; |
| 151 | int ret= -1; |
| 152 | int new_state,state,skip=0; |
| 153 | int listen; |
| 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 | listen = s->d1->listen; |
| 169 | |
| 170 | /* init things to blank */ |
| 171 | s->in_handshake++; |
| 172 | if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); |
| 173 | |
| 174 | s->d1->listen = listen; |
| 175 | #ifndef OPENSSL_NO_SCTP |
| 176 | /* Notify SCTP BIO socket to enter handshake |
| 177 | * mode and prevent stream identifier other |
| 178 | * than 0. Will be ignored if no SCTP is used. |
| 179 | */ |
| 180 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL); |
| 181 | #endif |
| 182 | |
| 183 | if (s->cert == NULL) |
| 184 | { |
| 185 | SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET); |
| 186 | return(-1); |
| 187 | } |
| 188 | |
| 189 | #ifndef OPENSSL_NO_HEARTBEATS |
| 190 | /* If we're awaiting a HeartbeatResponse, pretend we |
| 191 | * already got and don't await it anymore, because |
| 192 | * Heartbeats don't make sense during handshakes anyway. |
| 193 | */ |
| 194 | if (s->tlsext_hb_pending) |
| 195 | { |
| 196 | dtls1_stop_timer(s); |
| 197 | s->tlsext_hb_pending = 0; |
| 198 | s->tlsext_hb_seq++; |
| 199 | } |
| 200 | #endif |
| 201 | |
| 202 | for (;;) |
| 203 | { |
| 204 | state=s->state; |
| 205 | |
| 206 | switch (s->state) |
| 207 | { |
| 208 | case SSL_ST_RENEGOTIATE: |
| 209 | s->renegotiate=1; |
| 210 | /* s->state=SSL_ST_ACCEPT; */ |
| 211 | |
| 212 | case SSL_ST_BEFORE: |
| 213 | case SSL_ST_ACCEPT: |
| 214 | case SSL_ST_BEFORE|SSL_ST_ACCEPT: |
| 215 | case SSL_ST_OK|SSL_ST_ACCEPT: |
| 216 | |
| 217 | s->server=1; |
| 218 | if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); |
| 219 | |
| 220 | if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) |
| 221 | { |
| 222 | SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR); |
| 223 | return -1; |
| 224 | } |
| 225 | s->type=SSL_ST_ACCEPT; |
| 226 | |
| 227 | if (s->init_buf == NULL) |
| 228 | { |
| 229 | if ((buf=BUF_MEM_new()) == NULL) |
| 230 | { |
| 231 | ret= -1; |
| 232 | goto end; |
| 233 | } |
| 234 | if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) |
| 235 | { |
| 236 | ret= -1; |
| 237 | goto end; |
| 238 | } |
| 239 | s->init_buf=buf; |
| 240 | } |
| 241 | |
| 242 | if (!ssl3_setup_buffers(s)) |
| 243 | { |
| 244 | ret= -1; |
| 245 | goto end; |
| 246 | } |
| 247 | |
| 248 | s->init_num=0; |
| 249 | |
| 250 | if (s->state != SSL_ST_RENEGOTIATE) |
| 251 | { |
| 252 | /* Ok, we now need to push on a buffering BIO so that |
| 253 | * the output is sent in a way that TCP likes :-) |
| 254 | * ...but not with SCTP :-) |
| 255 | */ |
| 256 | #ifndef OPENSSL_NO_SCTP |
| 257 | if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) |
| 258 | #endif |
| 259 | if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; } |
| 260 | |
| 261 | ssl3_init_finished_mac(s); |
| 262 | s->state=SSL3_ST_SR_CLNT_HELLO_A; |
| 263 | s->ctx->stats.sess_accept++; |
| 264 | } |
| 265 | else |
| 266 | { |
| 267 | /* s->state == SSL_ST_RENEGOTIATE, |
| 268 | * we will just send a HelloRequest */ |
| 269 | s->ctx->stats.sess_accept_renegotiate++; |
| 270 | s->state=SSL3_ST_SW_HELLO_REQ_A; |
| 271 | } |
| 272 | |
| 273 | break; |
| 274 | |
| 275 | case SSL3_ST_SW_HELLO_REQ_A: |
| 276 | case SSL3_ST_SW_HELLO_REQ_B: |
| 277 | |
| 278 | s->shutdown=0; |
| 279 | dtls1_start_timer(s); |
| 280 | ret=dtls1_send_hello_request(s); |
| 281 | if (ret <= 0) goto end; |
| 282 | s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C; |
| 283 | s->state=SSL3_ST_SW_FLUSH; |
| 284 | s->init_num=0; |
| 285 | |
| 286 | ssl3_init_finished_mac(s); |
| 287 | break; |
| 288 | |
| 289 | case SSL3_ST_SW_HELLO_REQ_C: |
| 290 | s->state=SSL_ST_OK; |
| 291 | break; |
| 292 | |
| 293 | case SSL3_ST_SR_CLNT_HELLO_A: |
| 294 | case SSL3_ST_SR_CLNT_HELLO_B: |
| 295 | case SSL3_ST_SR_CLNT_HELLO_C: |
| 296 | |
| 297 | s->shutdown=0; |
| 298 | ret=ssl3_get_client_hello(s); |
| 299 | if (ret <= 0) goto end; |
| 300 | dtls1_stop_timer(s); |
| 301 | |
| 302 | if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) |
| 303 | s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; |
| 304 | else |
| 305 | s->state = SSL3_ST_SW_SRVR_HELLO_A; |
| 306 | |
| 307 | s->init_num=0; |
| 308 | |
| 309 | /* Reflect ClientHello sequence to remain stateless while listening */ |
| 310 | if (listen) |
| 311 | { |
| 312 | memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence)); |
| 313 | } |
| 314 | |
| 315 | /* If we're just listening, stop here */ |
| 316 | if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) |
| 317 | { |
| 318 | ret = 2; |
| 319 | s->d1->listen = 0; |
| 320 | /* Set expected sequence numbers |
| 321 | * to continue the handshake. |
| 322 | */ |
| 323 | s->d1->handshake_read_seq = 2; |
| 324 | s->d1->handshake_write_seq = 1; |
| 325 | s->d1->next_handshake_write_seq = 1; |
| 326 | goto end; |
| 327 | } |
| 328 | |
| 329 | break; |
| 330 | |
| 331 | case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: |
| 332 | case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: |
| 333 | |
| 334 | ret = dtls1_send_hello_verify_request(s); |
| 335 | if ( ret <= 0) goto end; |
| 336 | s->state=SSL3_ST_SW_FLUSH; |
| 337 | s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A; |
| 338 | |
| 339 | /* HelloVerifyRequest resets Finished MAC */ |
| 340 | if (s->version != DTLS1_BAD_VER) |
| 341 | ssl3_init_finished_mac(s); |
| 342 | break; |
| 343 | |
| 344 | #ifndef OPENSSL_NO_SCTP |
| 345 | case DTLS1_SCTP_ST_SR_READ_SOCK: |
| 346 | |
| 347 | if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) |
| 348 | { |
| 349 | s->s3->in_read_app_data=2; |
| 350 | s->rwstate=SSL_READING; |
| 351 | BIO_clear_retry_flags(SSL_get_rbio(s)); |
| 352 | BIO_set_retry_read(SSL_get_rbio(s)); |
| 353 | ret = -1; |
| 354 | goto end; |
| 355 | } |
| 356 | |
| 357 | s->state=SSL3_ST_SR_FINISHED_A; |
| 358 | break; |
| 359 | |
| 360 | case DTLS1_SCTP_ST_SW_WRITE_SOCK: |
| 361 | ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); |
| 362 | if (ret < 0) goto end; |
| 363 | |
| 364 | if (ret == 0) |
| 365 | { |
| 366 | if (s->d1->next_state != SSL_ST_OK) |
| 367 | { |
| 368 | s->s3->in_read_app_data=2; |
| 369 | s->rwstate=SSL_READING; |
| 370 | BIO_clear_retry_flags(SSL_get_rbio(s)); |
| 371 | BIO_set_retry_read(SSL_get_rbio(s)); |
| 372 | ret = -1; |
| 373 | goto end; |
| 374 | } |
| 375 | } |
| 376 | |
| 377 | s->state=s->d1->next_state; |
| 378 | break; |
| 379 | #endif |
| 380 | |
| 381 | case SSL3_ST_SW_SRVR_HELLO_A: |
| 382 | case SSL3_ST_SW_SRVR_HELLO_B: |
| 383 | s->renegotiate = 2; |
| 384 | dtls1_start_timer(s); |
| 385 | ret=dtls1_send_server_hello(s); |
| 386 | if (ret <= 0) goto end; |
| 387 | |
| 388 | if (s->hit) |
| 389 | { |
| 390 | #ifndef OPENSSL_NO_SCTP |
| 391 | /* Add new shared key for SCTP-Auth, |
| 392 | * will be ignored if no SCTP used. |
| 393 | */ |
| 394 | snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), |
| 395 | DTLS1_SCTP_AUTH_LABEL); |
| 396 | |
| 397 | SSL_export_keying_material(s, sctpauthkey, |
| 398 | sizeof(sctpauthkey), labelbuffer, |
| 399 | sizeof(labelbuffer), NULL, 0, 0); |
| 400 | |
| 401 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, |
| 402 | sizeof(sctpauthkey), sctpauthkey); |
| 403 | #endif |
| 404 | #ifndef OPENSSL_NO_TLSEXT |
| 405 | if (s->tlsext_ticket_expected) |
| 406 | s->state=SSL3_ST_SW_SESSION_TICKET_A; |
| 407 | else |
| 408 | s->state=SSL3_ST_SW_CHANGE_A; |
| 409 | #else |
| 410 | s->state=SSL3_ST_SW_CHANGE_A; |
| 411 | #endif |
| 412 | } |
| 413 | else |
| 414 | s->state=SSL3_ST_SW_CERT_A; |
| 415 | s->init_num=0; |
| 416 | break; |
| 417 | |
| 418 | case SSL3_ST_SW_CERT_A: |
| 419 | case SSL3_ST_SW_CERT_B: |
| 420 | /* Check if it is anon DH or normal PSK */ |
| 421 | if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) |
| 422 | && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) |
| 423 | { |
| 424 | dtls1_start_timer(s); |
| 425 | ret=dtls1_send_server_certificate(s); |
| 426 | if (ret <= 0) goto end; |
| 427 | #ifndef OPENSSL_NO_TLSEXT |
| 428 | if (s->tlsext_status_expected) |
| 429 | s->state=SSL3_ST_SW_CERT_STATUS_A; |
| 430 | else |
| 431 | s->state=SSL3_ST_SW_KEY_EXCH_A; |
| 432 | } |
| 433 | else |
| 434 | { |
| 435 | skip = 1; |
| 436 | s->state=SSL3_ST_SW_KEY_EXCH_A; |
| 437 | } |
| 438 | #else |
| 439 | } |
| 440 | else |
| 441 | skip=1; |
| 442 | |
| 443 | s->state=SSL3_ST_SW_KEY_EXCH_A; |
| 444 | #endif |
| 445 | s->init_num=0; |
| 446 | break; |
| 447 | |
| 448 | case SSL3_ST_SW_KEY_EXCH_A: |
| 449 | case SSL3_ST_SW_KEY_EXCH_B: |
| 450 | alg_k = s->s3->tmp.new_cipher->algorithm_mkey; |
| 451 | |
| 452 | /* clear this, it may get reset by |
| 453 | * send_server_key_exchange */ |
| 454 | if ((s->options & SSL_OP_EPHEMERAL_RSA) |
| 455 | #ifndef OPENSSL_NO_KRB5 |
| 456 | && !(alg_k & SSL_kKRB5) |
| 457 | #endif /* OPENSSL_NO_KRB5 */ |
| 458 | ) |
| 459 | /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key |
| 460 | * even when forbidden by protocol specs |
| 461 | * (handshake may fail as clients are not required to |
| 462 | * be able to handle this) */ |
| 463 | s->s3->tmp.use_rsa_tmp=1; |
| 464 | else |
| 465 | s->s3->tmp.use_rsa_tmp=0; |
| 466 | |
| 467 | /* only send if a DH key exchange or |
| 468 | * RSA but we have a sign only certificate */ |
| 469 | if (s->s3->tmp.use_rsa_tmp |
| 470 | /* PSK: send ServerKeyExchange if PSK identity |
| 471 | * hint if provided */ |
| 472 | #ifndef OPENSSL_NO_PSK |
| 473 | || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint) |
| 474 | #endif |
| 475 | || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) |
| 476 | || (alg_k & SSL_kEECDH) |
| 477 | || ((alg_k & SSL_kRSA) |
| 478 | && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL |
| 479 | || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) |
| 480 | && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) |
| 481 | ) |
| 482 | ) |
| 483 | ) |
| 484 | ) |
| 485 | { |
| 486 | dtls1_start_timer(s); |
| 487 | ret=dtls1_send_server_key_exchange(s); |
| 488 | if (ret <= 0) goto end; |
| 489 | } |
| 490 | else |
| 491 | skip=1; |
| 492 | |
| 493 | s->state=SSL3_ST_SW_CERT_REQ_A; |
| 494 | s->init_num=0; |
| 495 | break; |
| 496 | |
| 497 | case SSL3_ST_SW_CERT_REQ_A: |
| 498 | case SSL3_ST_SW_CERT_REQ_B: |
| 499 | if (/* don't request cert unless asked for it: */ |
| 500 | !(s->verify_mode & SSL_VERIFY_PEER) || |
| 501 | /* if SSL_VERIFY_CLIENT_ONCE is set, |
| 502 | * don't request cert during re-negotiation: */ |
| 503 | ((s->session->peer != NULL) && |
| 504 | (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || |
| 505 | /* never request cert in anonymous ciphersuites |
| 506 | * (see section "Certificate request" in SSL 3 drafts |
| 507 | * and in RFC 2246): */ |
| 508 | ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && |
| 509 | /* ... except when the application insists on verification |
| 510 | * (against the specs, but s3_clnt.c accepts this for SSL 3) */ |
| 511 | !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || |
| 512 | /* never request cert in Kerberos ciphersuites */ |
| 513 | (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) |
| 514 | /* With normal PSK Certificates and |
| 515 | * Certificate Requests are omitted */ |
| 516 | || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) |
| 517 | { |
| 518 | /* no cert request */ |
| 519 | skip=1; |
| 520 | s->s3->tmp.cert_request=0; |
| 521 | s->state=SSL3_ST_SW_SRVR_DONE_A; |
| 522 | #ifndef OPENSSL_NO_SCTP |
| 523 | if (BIO_dgram_is_sctp(SSL_get_wbio(s))) |
| 524 | { |
| 525 | s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; |
| 526 | s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; |
| 527 | } |
| 528 | #endif |
| 529 | } |
| 530 | else |
| 531 | { |
| 532 | s->s3->tmp.cert_request=1; |
| 533 | dtls1_start_timer(s); |
| 534 | ret=dtls1_send_certificate_request(s); |
| 535 | if (ret <= 0) goto end; |
| 536 | #ifndef NETSCAPE_HANG_BUG |
| 537 | s->state=SSL3_ST_SW_SRVR_DONE_A; |
| 538 | #ifndef OPENSSL_NO_SCTP |
| 539 | if (BIO_dgram_is_sctp(SSL_get_wbio(s))) |
| 540 | { |
| 541 | s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; |
| 542 | s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; |
| 543 | } |
| 544 | #endif |
| 545 | #else |
| 546 | s->state=SSL3_ST_SW_FLUSH; |
| 547 | s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; |
| 548 | #ifndef OPENSSL_NO_SCTP |
| 549 | if (BIO_dgram_is_sctp(SSL_get_wbio(s))) |
| 550 | { |
| 551 | s->d1->next_state = s->s3->tmp.next_state; |
| 552 | s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK; |
| 553 | } |
| 554 | #endif |
| 555 | #endif |
| 556 | s->init_num=0; |
| 557 | } |
| 558 | break; |
| 559 | |
| 560 | case SSL3_ST_SW_SRVR_DONE_A: |
| 561 | case SSL3_ST_SW_SRVR_DONE_B: |
| 562 | dtls1_start_timer(s); |
| 563 | ret=dtls1_send_server_done(s); |
| 564 | if (ret <= 0) goto end; |
| 565 | s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; |
| 566 | s->state=SSL3_ST_SW_FLUSH; |
| 567 | s->init_num=0; |
| 568 | break; |
| 569 | |
| 570 | case SSL3_ST_SW_FLUSH: |
| 571 | s->rwstate=SSL_WRITING; |
| 572 | if (BIO_flush(s->wbio) <= 0) |
| 573 | { |
| 574 | /* If the write error was fatal, stop trying */ |
| 575 | if (!BIO_should_retry(s->wbio)) |
| 576 | { |
| 577 | s->rwstate=SSL_NOTHING; |
| 578 | s->state=s->s3->tmp.next_state; |
| 579 | } |
| 580 | |
| 581 | ret= -1; |
| 582 | goto end; |
| 583 | } |
| 584 | s->rwstate=SSL_NOTHING; |
| 585 | s->state=s->s3->tmp.next_state; |
| 586 | break; |
| 587 | |
| 588 | case SSL3_ST_SR_CERT_A: |
| 589 | case SSL3_ST_SR_CERT_B: |
| 590 | /* Check for second client hello (MS SGC) */ |
| 591 | ret = ssl3_check_client_hello(s); |
| 592 | if (ret <= 0) |
| 593 | goto end; |
| 594 | if (ret == 2) |
| 595 | { |
| 596 | dtls1_stop_timer(s); |
| 597 | s->state = SSL3_ST_SR_CLNT_HELLO_C; |
| 598 | } |
| 599 | else { |
| 600 | /* could be sent for a DH cert, even if we |
| 601 | * have not asked for it :-) */ |
| 602 | ret=ssl3_get_client_certificate(s); |
| 603 | if (ret <= 0) goto end; |
| 604 | s->init_num=0; |
| 605 | s->state=SSL3_ST_SR_KEY_EXCH_A; |
| 606 | } |
| 607 | break; |
| 608 | |
| 609 | case SSL3_ST_SR_KEY_EXCH_A: |
| 610 | case SSL3_ST_SR_KEY_EXCH_B: |
| 611 | ret=ssl3_get_client_key_exchange(s); |
| 612 | if (ret <= 0) goto end; |
| 613 | #ifndef OPENSSL_NO_SCTP |
| 614 | /* Add new shared key for SCTP-Auth, |
| 615 | * will be ignored if no SCTP used. |
| 616 | */ |
| 617 | snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), |
| 618 | DTLS1_SCTP_AUTH_LABEL); |
| 619 | |
| 620 | SSL_export_keying_material(s, sctpauthkey, |
| 621 | sizeof(sctpauthkey), labelbuffer, |
| 622 | sizeof(labelbuffer), NULL, 0, 0); |
| 623 | |
| 624 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, |
| 625 | sizeof(sctpauthkey), sctpauthkey); |
| 626 | #endif |
| 627 | |
| 628 | s->state=SSL3_ST_SR_CERT_VRFY_A; |
| 629 | s->init_num=0; |
| 630 | |
| 631 | if (ret == 2) |
| 632 | { |
| 633 | /* For the ECDH ciphersuites when |
| 634 | * the client sends its ECDH pub key in |
| 635 | * a certificate, the CertificateVerify |
| 636 | * message is not sent. |
| 637 | */ |
| 638 | s->state=SSL3_ST_SR_FINISHED_A; |
| 639 | s->init_num = 0; |
| 640 | } |
| 641 | else |
| 642 | { |
| 643 | s->state=SSL3_ST_SR_CERT_VRFY_A; |
| 644 | s->init_num=0; |
| 645 | |
| 646 | /* We need to get hashes here so if there is |
| 647 | * a client cert, it can be verified */ |
| 648 | s->method->ssl3_enc->cert_verify_mac(s, |
| 649 | NID_md5, |
| 650 | &(s->s3->tmp.cert_verify_md[0])); |
| 651 | s->method->ssl3_enc->cert_verify_mac(s, |
| 652 | NID_sha1, |
| 653 | &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH])); |
| 654 | } |
| 655 | break; |
| 656 | |
| 657 | case SSL3_ST_SR_CERT_VRFY_A: |
| 658 | case SSL3_ST_SR_CERT_VRFY_B: |
| 659 | |
| 660 | s->d1->change_cipher_spec_ok = 1; |
| 661 | /* we should decide if we expected this one */ |
| 662 | ret=ssl3_get_cert_verify(s); |
| 663 | if (ret <= 0) goto end; |
| 664 | #ifndef OPENSSL_NO_SCTP |
| 665 | if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && |
| 666 | state == SSL_ST_RENEGOTIATE) |
| 667 | s->state=DTLS1_SCTP_ST_SR_READ_SOCK; |
| 668 | else |
| 669 | #endif |
| 670 | s->state=SSL3_ST_SR_FINISHED_A; |
| 671 | s->init_num=0; |
| 672 | break; |
| 673 | |
| 674 | case SSL3_ST_SR_FINISHED_A: |
| 675 | case SSL3_ST_SR_FINISHED_B: |
| 676 | s->d1->change_cipher_spec_ok = 1; |
| 677 | ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A, |
| 678 | SSL3_ST_SR_FINISHED_B); |
| 679 | if (ret <= 0) goto end; |
| 680 | dtls1_stop_timer(s); |
| 681 | if (s->hit) |
| 682 | s->state=SSL_ST_OK; |
| 683 | #ifndef OPENSSL_NO_TLSEXT |
| 684 | else if (s->tlsext_ticket_expected) |
| 685 | s->state=SSL3_ST_SW_SESSION_TICKET_A; |
| 686 | #endif |
| 687 | else |
| 688 | s->state=SSL3_ST_SW_CHANGE_A; |
| 689 | s->init_num=0; |
| 690 | break; |
| 691 | |
| 692 | #ifndef OPENSSL_NO_TLSEXT |
| 693 | case SSL3_ST_SW_SESSION_TICKET_A: |
| 694 | case SSL3_ST_SW_SESSION_TICKET_B: |
| 695 | ret=dtls1_send_newsession_ticket(s); |
| 696 | if (ret <= 0) goto end; |
| 697 | s->state=SSL3_ST_SW_CHANGE_A; |
| 698 | s->init_num=0; |
| 699 | break; |
| 700 | |
| 701 | case SSL3_ST_SW_CERT_STATUS_A: |
| 702 | case SSL3_ST_SW_CERT_STATUS_B: |
| 703 | ret=ssl3_send_cert_status(s); |
| 704 | if (ret <= 0) goto end; |
| 705 | s->state=SSL3_ST_SW_KEY_EXCH_A; |
| 706 | s->init_num=0; |
| 707 | break; |
| 708 | |
| 709 | #endif |
| 710 | |
| 711 | case SSL3_ST_SW_CHANGE_A: |
| 712 | case SSL3_ST_SW_CHANGE_B: |
| 713 | |
| 714 | s->session->cipher=s->s3->tmp.new_cipher; |
| 715 | if (!s->method->ssl3_enc->setup_key_block(s)) |
| 716 | { ret= -1; goto end; } |
| 717 | |
| 718 | ret=dtls1_send_change_cipher_spec(s, |
| 719 | SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B); |
| 720 | |
| 721 | if (ret <= 0) goto end; |
| 722 | |
| 723 | #ifndef OPENSSL_NO_SCTP |
| 724 | /* Change to new shared key of SCTP-Auth, |
| 725 | * will be ignored if no SCTP used. |
| 726 | */ |
| 727 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); |
| 728 | #endif |
| 729 | |
| 730 | s->state=SSL3_ST_SW_FINISHED_A; |
| 731 | s->init_num=0; |
| 732 | |
| 733 | if (!s->method->ssl3_enc->change_cipher_state(s, |
| 734 | SSL3_CHANGE_CIPHER_SERVER_WRITE)) |
| 735 | { |
| 736 | ret= -1; |
| 737 | goto end; |
| 738 | } |
| 739 | |
| 740 | dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); |
| 741 | break; |
| 742 | |
| 743 | case SSL3_ST_SW_FINISHED_A: |
| 744 | case SSL3_ST_SW_FINISHED_B: |
| 745 | ret=dtls1_send_finished(s, |
| 746 | SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B, |
| 747 | s->method->ssl3_enc->server_finished_label, |
| 748 | s->method->ssl3_enc->server_finished_label_len); |
| 749 | if (ret <= 0) goto end; |
| 750 | s->state=SSL3_ST_SW_FLUSH; |
| 751 | if (s->hit) |
| 752 | s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A; |
| 753 | else |
| 754 | { |
| 755 | s->s3->tmp.next_state=SSL_ST_OK; |
| 756 | #ifndef OPENSSL_NO_SCTP |
| 757 | if (BIO_dgram_is_sctp(SSL_get_wbio(s))) |
| 758 | { |
| 759 | s->d1->next_state = s->s3->tmp.next_state; |
| 760 | s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK; |
| 761 | } |
| 762 | #endif |
| 763 | } |
| 764 | s->init_num=0; |
| 765 | break; |
| 766 | |
| 767 | case SSL_ST_OK: |
| 768 | /* clean a few things up */ |
| 769 | ssl3_cleanup_key_block(s); |
| 770 | |
| 771 | #if 0 |
| 772 | BUF_MEM_free(s->init_buf); |
| 773 | s->init_buf=NULL; |
| 774 | #endif |
| 775 | |
| 776 | /* remove buffering on output */ |
| 777 | ssl_free_wbio_buffer(s); |
| 778 | |
| 779 | s->init_num=0; |
| 780 | |
| 781 | if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */ |
| 782 | { |
| 783 | s->renegotiate=0; |
| 784 | s->new_session=0; |
| 785 | |
| 786 | ssl_update_cache(s,SSL_SESS_CACHE_SERVER); |
| 787 | |
| 788 | s->ctx->stats.sess_accept_good++; |
| 789 | /* s->server=1; */ |
| 790 | s->handshake_func=dtls1_accept; |
| 791 | |
| 792 | if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); |
| 793 | } |
| 794 | |
| 795 | ret = 1; |
| 796 | |
| 797 | /* done handshaking, next message is client hello */ |
| 798 | s->d1->handshake_read_seq = 0; |
| 799 | /* next message is server hello */ |
| 800 | s->d1->handshake_write_seq = 0; |
| 801 | s->d1->next_handshake_write_seq = 0; |
| 802 | goto end; |
| 803 | /* break; */ |
| 804 | |
| 805 | default: |
| 806 | SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE); |
| 807 | ret= -1; |
| 808 | goto end; |
| 809 | /* break; */ |
| 810 | } |
| 811 | |
| 812 | if (!s->s3->tmp.reuse_message && !skip) |
| 813 | { |
| 814 | if (s->debug) |
| 815 | { |
| 816 | if ((ret=BIO_flush(s->wbio)) <= 0) |
| 817 | goto end; |
| 818 | } |
| 819 | |
| 820 | |
| 821 | if ((cb != NULL) && (s->state != state)) |
| 822 | { |
| 823 | new_state=s->state; |
| 824 | s->state=state; |
| 825 | cb(s,SSL_CB_ACCEPT_LOOP,1); |
| 826 | s->state=new_state; |
| 827 | } |
| 828 | } |
| 829 | skip=0; |
| 830 | } |
| 831 | end: |
| 832 | /* BIO_flush(s->wbio); */ |
| 833 | |
| 834 | s->in_handshake--; |
| 835 | #ifndef OPENSSL_NO_SCTP |
| 836 | /* Notify SCTP BIO socket to leave handshake |
| 837 | * mode and prevent stream identifier other |
| 838 | * than 0. Will be ignored if no SCTP is used. |
| 839 | */ |
| 840 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL); |
| 841 | #endif |
| 842 | |
| 843 | if (cb != NULL) |
| 844 | cb(s,SSL_CB_ACCEPT_EXIT,ret); |
| 845 | return(ret); |
| 846 | } |
| 847 | |
| 848 | int dtls1_send_hello_request(SSL *s) |
| 849 | { |
| 850 | unsigned char *p; |
| 851 | |
| 852 | if (s->state == SSL3_ST_SW_HELLO_REQ_A) |
| 853 | { |
| 854 | p=(unsigned char *)s->init_buf->data; |
| 855 | p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0); |
| 856 | |
| 857 | s->state=SSL3_ST_SW_HELLO_REQ_B; |
| 858 | /* number of bytes to write */ |
| 859 | s->init_num=DTLS1_HM_HEADER_LENGTH; |
| 860 | s->init_off=0; |
| 861 | |
| 862 | /* no need to buffer this message, since there are no retransmit |
| 863 | * requests for it */ |
| 864 | } |
| 865 | |
| 866 | /* SSL3_ST_SW_HELLO_REQ_B */ |
| 867 | return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); |
| 868 | } |
| 869 | |
| 870 | int dtls1_send_hello_verify_request(SSL *s) |
| 871 | { |
| 872 | unsigned int msg_len; |
| 873 | unsigned char *msg, *buf, *p; |
| 874 | |
| 875 | if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) |
| 876 | { |
| 877 | buf = (unsigned char *)s->init_buf->data; |
| 878 | |
| 879 | msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); |
| 880 | *(p++) = s->version >> 8; |
| 881 | *(p++) = s->version & 0xFF; |
| 882 | |
| 883 | if (s->ctx->app_gen_cookie_cb == NULL || |
| 884 | s->ctx->app_gen_cookie_cb(s, s->d1->cookie, |
| 885 | &(s->d1->cookie_len)) == 0) |
| 886 | { |
| 887 | SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR); |
| 888 | return 0; |
| 889 | } |
| 890 | |
| 891 | *(p++) = (unsigned char) s->d1->cookie_len; |
| 892 | memcpy(p, s->d1->cookie, s->d1->cookie_len); |
| 893 | p += s->d1->cookie_len; |
| 894 | msg_len = p - msg; |
| 895 | |
| 896 | dtls1_set_message_header(s, buf, |
| 897 | DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len); |
| 898 | |
| 899 | s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; |
| 900 | /* number of bytes to write */ |
| 901 | s->init_num=p-buf; |
| 902 | s->init_off=0; |
| 903 | } |
| 904 | |
| 905 | /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ |
| 906 | return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); |
| 907 | } |
| 908 | |
| 909 | int dtls1_send_server_hello(SSL *s) |
| 910 | { |
| 911 | unsigned char *buf; |
| 912 | unsigned char *p,*d; |
| 913 | int i; |
| 914 | unsigned int sl; |
| 915 | unsigned long l,Time; |
| 916 | |
| 917 | if (s->state == SSL3_ST_SW_SRVR_HELLO_A) |
| 918 | { |
| 919 | buf=(unsigned char *)s->init_buf->data; |
| 920 | p=s->s3->server_random; |
| 921 | Time=(unsigned long)time(NULL); /* Time */ |
| 922 | l2n(Time,p); |
| 923 | RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4); |
| 924 | /* Do the message type and length last */ |
| 925 | d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); |
| 926 | |
| 927 | *(p++)=s->version>>8; |
| 928 | *(p++)=s->version&0xff; |
| 929 | |
| 930 | /* Random stuff */ |
| 931 | memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); |
| 932 | p+=SSL3_RANDOM_SIZE; |
| 933 | |
| 934 | /* now in theory we have 3 options to sending back the |
| 935 | * session id. If it is a re-use, we send back the |
| 936 | * old session-id, if it is a new session, we send |
| 937 | * back the new session-id or we send back a 0 length |
| 938 | * session-id if we want it to be single use. |
| 939 | * Currently I will not implement the '0' length session-id |
| 940 | * 12-Jan-98 - I'll now support the '0' length stuff. |
| 941 | */ |
| 942 | if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) |
| 943 | s->session->session_id_length=0; |
| 944 | |
| 945 | sl=s->session->session_id_length; |
| 946 | if (sl > sizeof s->session->session_id) |
| 947 | { |
| 948 | SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); |
| 949 | return -1; |
| 950 | } |
| 951 | *(p++)=sl; |
| 952 | memcpy(p,s->session->session_id,sl); |
| 953 | p+=sl; |
| 954 | |
| 955 | /* put the cipher */ |
| 956 | if (s->s3->tmp.new_cipher == NULL) |
| 957 | return -1; |
| 958 | i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p); |
| 959 | p+=i; |
| 960 | |
| 961 | /* put the compression method */ |
| 962 | #ifdef OPENSSL_NO_COMP |
| 963 | *(p++)=0; |
| 964 | #else |
| 965 | if (s->s3->tmp.new_compression == NULL) |
| 966 | *(p++)=0; |
| 967 | else |
| 968 | *(p++)=s->s3->tmp.new_compression->id; |
| 969 | #endif |
| 970 | |
| 971 | #ifndef OPENSSL_NO_TLSEXT |
| 972 | if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) |
| 973 | { |
| 974 | SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR); |
| 975 | return -1; |
| 976 | } |
| 977 | #endif |
| 978 | |
| 979 | /* do the header */ |
| 980 | l=(p-d); |
| 981 | d=buf; |
| 982 | |
| 983 | d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l); |
| 984 | |
| 985 | s->state=SSL3_ST_SW_SRVR_HELLO_B; |
| 986 | /* number of bytes to write */ |
| 987 | s->init_num=p-buf; |
| 988 | s->init_off=0; |
| 989 | |
| 990 | /* buffer the message to handle re-xmits */ |
| 991 | dtls1_buffer_message(s, 0); |
| 992 | } |
| 993 | |
| 994 | /* SSL3_ST_SW_SRVR_HELLO_B */ |
| 995 | return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); |
| 996 | } |
| 997 | |
| 998 | int dtls1_send_server_done(SSL *s) |
| 999 | { |
| 1000 | unsigned char *p; |
| 1001 | |
| 1002 | if (s->state == SSL3_ST_SW_SRVR_DONE_A) |
| 1003 | { |
| 1004 | p=(unsigned char *)s->init_buf->data; |
| 1005 | |
| 1006 | /* do the header */ |
| 1007 | p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0); |
| 1008 | |
| 1009 | s->state=SSL3_ST_SW_SRVR_DONE_B; |
| 1010 | /* number of bytes to write */ |
| 1011 | s->init_num=DTLS1_HM_HEADER_LENGTH; |
| 1012 | s->init_off=0; |
| 1013 | |
| 1014 | /* buffer the message to handle re-xmits */ |
| 1015 | dtls1_buffer_message(s, 0); |
| 1016 | } |
| 1017 | |
| 1018 | /* SSL3_ST_SW_SRVR_DONE_B */ |
| 1019 | return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); |
| 1020 | } |
| 1021 | |
| 1022 | int dtls1_send_server_key_exchange(SSL *s) |
| 1023 | { |
| 1024 | #ifndef OPENSSL_NO_RSA |
| 1025 | unsigned char *q; |
| 1026 | int j,num; |
| 1027 | RSA *rsa; |
| 1028 | unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; |
| 1029 | unsigned int u; |
| 1030 | #endif |
| 1031 | #ifndef OPENSSL_NO_DH |
| 1032 | DH *dh=NULL,*dhp; |
| 1033 | #endif |
| 1034 | #ifndef OPENSSL_NO_ECDH |
| 1035 | EC_KEY *ecdh=NULL, *ecdhp; |
| 1036 | unsigned char *encodedPoint = NULL; |
| 1037 | int encodedlen = 0; |
| 1038 | int curve_id = 0; |
| 1039 | BN_CTX *bn_ctx = NULL; |
| 1040 | #endif |
| 1041 | EVP_PKEY *pkey; |
| 1042 | unsigned char *p,*d; |
| 1043 | int al,i; |
| 1044 | unsigned long type; |
| 1045 | int n; |
| 1046 | CERT *cert; |
| 1047 | BIGNUM *r[4]; |
| 1048 | int nr[4],kn; |
| 1049 | BUF_MEM *buf; |
| 1050 | EVP_MD_CTX md_ctx; |
| 1051 | |
| 1052 | EVP_MD_CTX_init(&md_ctx); |
| 1053 | if (s->state == SSL3_ST_SW_KEY_EXCH_A) |
| 1054 | { |
| 1055 | type=s->s3->tmp.new_cipher->algorithm_mkey; |
| 1056 | cert=s->cert; |
| 1057 | |
| 1058 | buf=s->init_buf; |
| 1059 | |
| 1060 | r[0]=r[1]=r[2]=r[3]=NULL; |
| 1061 | n=0; |
| 1062 | #ifndef OPENSSL_NO_RSA |
| 1063 | if (type & SSL_kRSA) |
| 1064 | { |
| 1065 | rsa=cert->rsa_tmp; |
| 1066 | if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) |
| 1067 | { |
| 1068 | rsa=s->cert->rsa_tmp_cb(s, |
| 1069 | SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), |
| 1070 | SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); |
| 1071 | if(rsa == NULL) |
| 1072 | { |
| 1073 | al=SSL_AD_HANDSHAKE_FAILURE; |
| 1074 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY); |
| 1075 | goto f_err; |
| 1076 | } |
| 1077 | RSA_up_ref(rsa); |
| 1078 | cert->rsa_tmp=rsa; |
| 1079 | } |
| 1080 | if (rsa == NULL) |
| 1081 | { |
| 1082 | al=SSL_AD_HANDSHAKE_FAILURE; |
| 1083 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY); |
| 1084 | goto f_err; |
| 1085 | } |
| 1086 | r[0]=rsa->n; |
| 1087 | r[1]=rsa->e; |
| 1088 | s->s3->tmp.use_rsa_tmp=1; |
| 1089 | } |
| 1090 | else |
| 1091 | #endif |
| 1092 | #ifndef OPENSSL_NO_DH |
| 1093 | if (type & SSL_kEDH) |
| 1094 | { |
| 1095 | dhp=cert->dh_tmp; |
| 1096 | if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) |
| 1097 | dhp=s->cert->dh_tmp_cb(s, |
| 1098 | SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), |
| 1099 | SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); |
| 1100 | if (dhp == NULL) |
| 1101 | { |
| 1102 | al=SSL_AD_HANDSHAKE_FAILURE; |
| 1103 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY); |
| 1104 | goto f_err; |
| 1105 | } |
| 1106 | |
| 1107 | if (s->s3->tmp.dh != NULL) |
| 1108 | { |
| 1109 | DH_free(dh); |
| 1110 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
| 1111 | goto err; |
| 1112 | } |
| 1113 | |
| 1114 | if ((dh=DHparams_dup(dhp)) == NULL) |
| 1115 | { |
| 1116 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); |
| 1117 | goto err; |
| 1118 | } |
| 1119 | |
| 1120 | s->s3->tmp.dh=dh; |
| 1121 | if ((dhp->pub_key == NULL || |
| 1122 | dhp->priv_key == NULL || |
| 1123 | (s->options & SSL_OP_SINGLE_DH_USE))) |
| 1124 | { |
| 1125 | if(!DH_generate_key(dh)) |
| 1126 | { |
| 1127 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, |
| 1128 | ERR_R_DH_LIB); |
| 1129 | goto err; |
| 1130 | } |
| 1131 | } |
| 1132 | else |
| 1133 | { |
| 1134 | dh->pub_key=BN_dup(dhp->pub_key); |
| 1135 | dh->priv_key=BN_dup(dhp->priv_key); |
| 1136 | if ((dh->pub_key == NULL) || |
| 1137 | (dh->priv_key == NULL)) |
| 1138 | { |
| 1139 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); |
| 1140 | goto err; |
| 1141 | } |
| 1142 | } |
| 1143 | r[0]=dh->p; |
| 1144 | r[1]=dh->g; |
| 1145 | r[2]=dh->pub_key; |
| 1146 | } |
| 1147 | else |
| 1148 | #endif |
| 1149 | #ifndef OPENSSL_NO_ECDH |
| 1150 | if (type & SSL_kEECDH) |
| 1151 | { |
| 1152 | const EC_GROUP *group; |
| 1153 | |
| 1154 | ecdhp=cert->ecdh_tmp; |
| 1155 | if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL)) |
| 1156 | { |
| 1157 | ecdhp=s->cert->ecdh_tmp_cb(s, |
| 1158 | SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), |
| 1159 | SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); |
| 1160 | } |
| 1161 | if (ecdhp == NULL) |
| 1162 | { |
| 1163 | al=SSL_AD_HANDSHAKE_FAILURE; |
| 1164 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY); |
| 1165 | goto f_err; |
| 1166 | } |
| 1167 | |
| 1168 | if (s->s3->tmp.ecdh != NULL) |
| 1169 | { |
| 1170 | EC_KEY_free(s->s3->tmp.ecdh); |
| 1171 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
| 1172 | goto err; |
| 1173 | } |
| 1174 | |
| 1175 | /* Duplicate the ECDH structure. */ |
| 1176 | if (ecdhp == NULL) |
| 1177 | { |
| 1178 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); |
| 1179 | goto err; |
| 1180 | } |
| 1181 | if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) |
| 1182 | { |
| 1183 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); |
| 1184 | goto err; |
| 1185 | } |
| 1186 | |
| 1187 | s->s3->tmp.ecdh=ecdh; |
| 1188 | if ((EC_KEY_get0_public_key(ecdh) == NULL) || |
| 1189 | (EC_KEY_get0_private_key(ecdh) == NULL) || |
| 1190 | (s->options & SSL_OP_SINGLE_ECDH_USE)) |
| 1191 | { |
| 1192 | if(!EC_KEY_generate_key(ecdh)) |
| 1193 | { |
| 1194 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); |
| 1195 | goto err; |
| 1196 | } |
| 1197 | } |
| 1198 | |
| 1199 | if (((group = EC_KEY_get0_group(ecdh)) == NULL) || |
| 1200 | (EC_KEY_get0_public_key(ecdh) == NULL) || |
| 1201 | (EC_KEY_get0_private_key(ecdh) == NULL)) |
| 1202 | { |
| 1203 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); |
| 1204 | goto err; |
| 1205 | } |
| 1206 | |
| 1207 | if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && |
| 1208 | (EC_GROUP_get_degree(group) > 163)) |
| 1209 | { |
| 1210 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER); |
| 1211 | goto err; |
| 1212 | } |
| 1213 | |
| 1214 | /* XXX: For now, we only support ephemeral ECDH |
| 1215 | * keys over named (not generic) curves. For |
| 1216 | * supported named curves, curve_id is non-zero. |
| 1217 | */ |
| 1218 | if ((curve_id = |
| 1219 | tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group))) |
| 1220 | == 0) |
| 1221 | { |
| 1222 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); |
| 1223 | goto err; |
| 1224 | } |
| 1225 | |
| 1226 | /* Encode the public key. |
| 1227 | * First check the size of encoding and |
| 1228 | * allocate memory accordingly. |
| 1229 | */ |
| 1230 | encodedlen = EC_POINT_point2oct(group, |
| 1231 | EC_KEY_get0_public_key(ecdh), |
| 1232 | POINT_CONVERSION_UNCOMPRESSED, |
| 1233 | NULL, 0, NULL); |
| 1234 | |
| 1235 | encodedPoint = (unsigned char *) |
| 1236 | OPENSSL_malloc(encodedlen*sizeof(unsigned char)); |
| 1237 | bn_ctx = BN_CTX_new(); |
| 1238 | if ((encodedPoint == NULL) || (bn_ctx == NULL)) |
| 1239 | { |
| 1240 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); |
| 1241 | goto err; |
| 1242 | } |
| 1243 | |
| 1244 | |
| 1245 | encodedlen = EC_POINT_point2oct(group, |
| 1246 | EC_KEY_get0_public_key(ecdh), |
| 1247 | POINT_CONVERSION_UNCOMPRESSED, |
| 1248 | encodedPoint, encodedlen, bn_ctx); |
| 1249 | |
| 1250 | if (encodedlen == 0) |
| 1251 | { |
| 1252 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); |
| 1253 | goto err; |
| 1254 | } |
| 1255 | |
| 1256 | BN_CTX_free(bn_ctx); bn_ctx=NULL; |
| 1257 | |
| 1258 | /* XXX: For now, we only support named (not |
| 1259 | * generic) curves in ECDH ephemeral key exchanges. |
| 1260 | * In this situation, we need four additional bytes |
| 1261 | * to encode the entire ServerECDHParams |
| 1262 | * structure. |
| 1263 | */ |
| 1264 | n = 4 + encodedlen; |
| 1265 | |
| 1266 | /* We'll generate the serverKeyExchange message |
| 1267 | * explicitly so we can set these to NULLs |
| 1268 | */ |
| 1269 | r[0]=NULL; |
| 1270 | r[1]=NULL; |
| 1271 | r[2]=NULL; |
| 1272 | r[3]=NULL; |
| 1273 | } |
| 1274 | else |
| 1275 | #endif /* !OPENSSL_NO_ECDH */ |
| 1276 | #ifndef OPENSSL_NO_PSK |
| 1277 | if (type & SSL_kPSK) |
| 1278 | { |
| 1279 | /* reserve size for record length and PSK identity hint*/ |
| 1280 | n+=2+strlen(s->ctx->psk_identity_hint); |
| 1281 | } |
| 1282 | else |
| 1283 | #endif /* !OPENSSL_NO_PSK */ |
| 1284 | { |
| 1285 | al=SSL_AD_HANDSHAKE_FAILURE; |
| 1286 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); |
| 1287 | goto f_err; |
| 1288 | } |
| 1289 | for (i=0; r[i] != NULL; i++) |
| 1290 | { |
| 1291 | nr[i]=BN_num_bytes(r[i]); |
| 1292 | n+=2+nr[i]; |
| 1293 | } |
| 1294 | |
| 1295 | if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) |
| 1296 | && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) |
| 1297 | { |
| 1298 | if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL)) |
| 1299 | == NULL) |
| 1300 | { |
| 1301 | al=SSL_AD_DECODE_ERROR; |
| 1302 | goto f_err; |
| 1303 | } |
| 1304 | kn=EVP_PKEY_size(pkey); |
| 1305 | } |
| 1306 | else |
| 1307 | { |
| 1308 | pkey=NULL; |
| 1309 | kn=0; |
| 1310 | } |
| 1311 | |
| 1312 | if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn)) |
| 1313 | { |
| 1314 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF); |
| 1315 | goto err; |
| 1316 | } |
| 1317 | d=(unsigned char *)s->init_buf->data; |
| 1318 | p= &(d[DTLS1_HM_HEADER_LENGTH]); |
| 1319 | |
| 1320 | for (i=0; r[i] != NULL; i++) |
| 1321 | { |
| 1322 | s2n(nr[i],p); |
| 1323 | BN_bn2bin(r[i],p); |
| 1324 | p+=nr[i]; |
| 1325 | } |
| 1326 | |
| 1327 | #ifndef OPENSSL_NO_ECDH |
| 1328 | if (type & SSL_kEECDH) |
| 1329 | { |
| 1330 | /* XXX: For now, we only support named (not generic) curves. |
| 1331 | * In this situation, the serverKeyExchange message has: |
| 1332 | * [1 byte CurveType], [2 byte CurveName] |
| 1333 | * [1 byte length of encoded point], followed by |
| 1334 | * the actual encoded point itself |
| 1335 | */ |
| 1336 | *p = NAMED_CURVE_TYPE; |
| 1337 | p += 1; |
| 1338 | *p = 0; |
| 1339 | p += 1; |
| 1340 | *p = curve_id; |
| 1341 | p += 1; |
| 1342 | *p = encodedlen; |
| 1343 | p += 1; |
| 1344 | memcpy((unsigned char*)p, |
| 1345 | (unsigned char *)encodedPoint, |
| 1346 | encodedlen); |
| 1347 | OPENSSL_free(encodedPoint); |
| 1348 | p += encodedlen; |
| 1349 | } |
| 1350 | #endif |
| 1351 | |
| 1352 | #ifndef OPENSSL_NO_PSK |
| 1353 | if (type & SSL_kPSK) |
| 1354 | { |
| 1355 | /* copy PSK identity hint */ |
| 1356 | s2n(strlen(s->ctx->psk_identity_hint), p); |
| 1357 | strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint)); |
| 1358 | p+=strlen(s->ctx->psk_identity_hint); |
| 1359 | } |
| 1360 | #endif |
| 1361 | |
| 1362 | /* not anonymous */ |
| 1363 | if (pkey != NULL) |
| 1364 | { |
| 1365 | /* n is the length of the params, they start at |
| 1366 | * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space |
| 1367 | * at the end. */ |
| 1368 | #ifndef OPENSSL_NO_RSA |
| 1369 | if (pkey->type == EVP_PKEY_RSA) |
| 1370 | { |
| 1371 | q=md_buf; |
| 1372 | j=0; |
| 1373 | for (num=2; num > 0; num--) |
| 1374 | { |
| 1375 | EVP_DigestInit_ex(&md_ctx,(num == 2) |
| 1376 | ?s->ctx->md5:s->ctx->sha1, NULL); |
| 1377 | EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); |
| 1378 | EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); |
| 1379 | EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); |
| 1380 | EVP_DigestFinal_ex(&md_ctx,q, |
| 1381 | (unsigned int *)&i); |
| 1382 | q+=i; |
| 1383 | j+=i; |
| 1384 | } |
| 1385 | if (RSA_sign(NID_md5_sha1, md_buf, j, |
| 1386 | &(p[2]), &u, pkey->pkey.rsa) <= 0) |
| 1387 | { |
| 1388 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA); |
| 1389 | goto err; |
| 1390 | } |
| 1391 | s2n(u,p); |
| 1392 | n+=u+2; |
| 1393 | } |
| 1394 | else |
| 1395 | #endif |
| 1396 | #if !defined(OPENSSL_NO_DSA) |
| 1397 | if (pkey->type == EVP_PKEY_DSA) |
| 1398 | { |
| 1399 | /* lets do DSS */ |
| 1400 | EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL); |
| 1401 | EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); |
| 1402 | EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); |
| 1403 | EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); |
| 1404 | if (!EVP_SignFinal(&md_ctx,&(p[2]), |
| 1405 | (unsigned int *)&i,pkey)) |
| 1406 | { |
| 1407 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA); |
| 1408 | goto err; |
| 1409 | } |
| 1410 | s2n(i,p); |
| 1411 | n+=i+2; |
| 1412 | } |
| 1413 | else |
| 1414 | #endif |
| 1415 | #if !defined(OPENSSL_NO_ECDSA) |
| 1416 | if (pkey->type == EVP_PKEY_EC) |
| 1417 | { |
| 1418 | /* let's do ECDSA */ |
| 1419 | EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL); |
| 1420 | EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); |
| 1421 | EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); |
| 1422 | EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); |
| 1423 | if (!EVP_SignFinal(&md_ctx,&(p[2]), |
| 1424 | (unsigned int *)&i,pkey)) |
| 1425 | { |
| 1426 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA); |
| 1427 | goto err; |
| 1428 | } |
| 1429 | s2n(i,p); |
| 1430 | n+=i+2; |
| 1431 | } |
| 1432 | else |
| 1433 | #endif |
| 1434 | { |
| 1435 | /* Is this error check actually needed? */ |
| 1436 | al=SSL_AD_HANDSHAKE_FAILURE; |
| 1437 | SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE); |
| 1438 | goto f_err; |
| 1439 | } |
| 1440 | } |
| 1441 | |
| 1442 | d = dtls1_set_message_header(s, d, |
| 1443 | SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n); |
| 1444 | |
| 1445 | /* we should now have things packed up, so lets send |
| 1446 | * it off */ |
| 1447 | s->init_num=n+DTLS1_HM_HEADER_LENGTH; |
| 1448 | s->init_off=0; |
| 1449 | |
| 1450 | /* buffer the message to handle re-xmits */ |
| 1451 | dtls1_buffer_message(s, 0); |
| 1452 | } |
| 1453 | |
| 1454 | s->state = SSL3_ST_SW_KEY_EXCH_B; |
| 1455 | EVP_MD_CTX_cleanup(&md_ctx); |
| 1456 | return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); |
| 1457 | f_err: |
| 1458 | ssl3_send_alert(s,SSL3_AL_FATAL,al); |
| 1459 | err: |
| 1460 | #ifndef OPENSSL_NO_ECDH |
| 1461 | if (encodedPoint != NULL) OPENSSL_free(encodedPoint); |
| 1462 | BN_CTX_free(bn_ctx); |
| 1463 | #endif |
| 1464 | EVP_MD_CTX_cleanup(&md_ctx); |
| 1465 | return(-1); |
| 1466 | } |
| 1467 | |
| 1468 | int dtls1_send_certificate_request(SSL *s) |
| 1469 | { |
| 1470 | unsigned char *p,*d; |
| 1471 | int i,j,nl,off,n; |
| 1472 | STACK_OF(X509_NAME) *sk=NULL; |
| 1473 | X509_NAME *name; |
| 1474 | BUF_MEM *buf; |
| 1475 | unsigned int msg_len; |
| 1476 | |
| 1477 | if (s->state == SSL3_ST_SW_CERT_REQ_A) |
| 1478 | { |
| 1479 | buf=s->init_buf; |
| 1480 | |
| 1481 | d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); |
| 1482 | |
| 1483 | /* get the list of acceptable cert types */ |
| 1484 | p++; |
| 1485 | n=ssl3_get_req_cert_type(s,p); |
| 1486 | d[0]=n; |
| 1487 | p+=n; |
| 1488 | n++; |
| 1489 | |
| 1490 | off=n; |
| 1491 | p+=2; |
| 1492 | n+=2; |
| 1493 | |
| 1494 | sk=SSL_get_client_CA_list(s); |
| 1495 | nl=0; |
| 1496 | if (sk != NULL) |
| 1497 | { |
| 1498 | for (i=0; i<sk_X509_NAME_num(sk); i++) |
| 1499 | { |
| 1500 | name=sk_X509_NAME_value(sk,i); |
| 1501 | j=i2d_X509_NAME(name,NULL); |
| 1502 | if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2)) |
| 1503 | { |
| 1504 | SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB); |
| 1505 | goto err; |
| 1506 | } |
| 1507 | p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]); |
| 1508 | if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) |
| 1509 | { |
| 1510 | s2n(j,p); |
| 1511 | i2d_X509_NAME(name,&p); |
| 1512 | n+=2+j; |
| 1513 | nl+=2+j; |
| 1514 | } |
| 1515 | else |
| 1516 | { |
| 1517 | d=p; |
| 1518 | i2d_X509_NAME(name,&p); |
| 1519 | j-=2; s2n(j,d); j+=2; |
| 1520 | n+=j; |
| 1521 | nl+=j; |
| 1522 | } |
| 1523 | } |
| 1524 | } |
| 1525 | /* else no CA names */ |
| 1526 | p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]); |
| 1527 | s2n(nl,p); |
| 1528 | |
| 1529 | d=(unsigned char *)buf->data; |
| 1530 | *(d++)=SSL3_MT_CERTIFICATE_REQUEST; |
| 1531 | l2n3(n,d); |
| 1532 | s2n(s->d1->handshake_write_seq,d); |
| 1533 | s->d1->handshake_write_seq++; |
| 1534 | |
| 1535 | /* we should now have things packed up, so lets send |
| 1536 | * it off */ |
| 1537 | |
| 1538 | s->init_num=n+DTLS1_HM_HEADER_LENGTH; |
| 1539 | s->init_off=0; |
| 1540 | #ifdef NETSCAPE_HANG_BUG |
| 1541 | /* XXX: what to do about this? */ |
| 1542 | p=(unsigned char *)s->init_buf->data + s->init_num; |
| 1543 | |
| 1544 | /* do the header */ |
| 1545 | *(p++)=SSL3_MT_SERVER_DONE; |
| 1546 | *(p++)=0; |
| 1547 | *(p++)=0; |
| 1548 | *(p++)=0; |
| 1549 | s->init_num += 4; |
| 1550 | #endif |
| 1551 | |
| 1552 | /* XDTLS: set message header ? */ |
| 1553 | msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; |
| 1554 | dtls1_set_message_header(s, (void *)s->init_buf->data, |
| 1555 | SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len); |
| 1556 | |
| 1557 | /* buffer the message to handle re-xmits */ |
| 1558 | dtls1_buffer_message(s, 0); |
| 1559 | |
| 1560 | s->state = SSL3_ST_SW_CERT_REQ_B; |
| 1561 | } |
| 1562 | |
| 1563 | /* SSL3_ST_SW_CERT_REQ_B */ |
| 1564 | return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); |
| 1565 | err: |
| 1566 | return(-1); |
| 1567 | } |
| 1568 | |
| 1569 | int dtls1_send_server_certificate(SSL *s) |
| 1570 | { |
| 1571 | unsigned long l; |
| 1572 | X509 *x; |
| 1573 | |
| 1574 | if (s->state == SSL3_ST_SW_CERT_A) |
| 1575 | { |
| 1576 | x=ssl_get_server_send_cert(s); |
| 1577 | if (x == NULL) |
| 1578 | { |
| 1579 | /* VRS: allow null cert if auth == KRB5 */ |
| 1580 | if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) || |
| 1581 | (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5)) |
| 1582 | { |
| 1583 | SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR); |
| 1584 | return(0); |
| 1585 | } |
| 1586 | } |
| 1587 | |
| 1588 | l=dtls1_output_cert_chain(s,x); |
| 1589 | s->state=SSL3_ST_SW_CERT_B; |
| 1590 | s->init_num=(int)l; |
| 1591 | s->init_off=0; |
| 1592 | |
| 1593 | /* buffer the message to handle re-xmits */ |
| 1594 | dtls1_buffer_message(s, 0); |
| 1595 | } |
| 1596 | |
| 1597 | /* SSL3_ST_SW_CERT_B */ |
| 1598 | return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); |
| 1599 | } |
| 1600 | |
| 1601 | #ifndef OPENSSL_NO_TLSEXT |
| 1602 | int dtls1_send_newsession_ticket(SSL *s) |
| 1603 | { |
| 1604 | if (s->state == SSL3_ST_SW_SESSION_TICKET_A) |
| 1605 | { |
| 1606 | unsigned char *p, *senc, *macstart; |
| 1607 | int len, slen; |
| 1608 | unsigned int hlen, msg_len; |
| 1609 | EVP_CIPHER_CTX ctx; |
| 1610 | HMAC_CTX hctx; |
| 1611 | SSL_CTX *tctx = s->initial_ctx; |
| 1612 | unsigned char iv[EVP_MAX_IV_LENGTH]; |
| 1613 | unsigned char key_name[16]; |
| 1614 | |
| 1615 | /* get session encoding length */ |
| 1616 | slen = i2d_SSL_SESSION(s->session, NULL); |
| 1617 | /* Some length values are 16 bits, so forget it if session is |
| 1618 | * too long |
| 1619 | */ |
| 1620 | if (slen > 0xFF00) |
| 1621 | return -1; |
| 1622 | /* Grow buffer if need be: the length calculation is as |
| 1623 | * follows 12 (DTLS handshake message header) + |
| 1624 | * 4 (ticket lifetime hint) + 2 (ticket length) + |
| 1625 | * 16 (key name) + max_iv_len (iv length) + |
| 1626 | * session_length + max_enc_block_size (max encrypted session |
| 1627 | * length) + max_md_size (HMAC). |
| 1628 | */ |
| 1629 | if (!BUF_MEM_grow(s->init_buf, |
| 1630 | DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH + |
| 1631 | EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) |
| 1632 | return -1; |
| 1633 | senc = OPENSSL_malloc(slen); |
| 1634 | if (!senc) |
| 1635 | return -1; |
| 1636 | p = senc; |
| 1637 | i2d_SSL_SESSION(s->session, &p); |
| 1638 | |
| 1639 | p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]); |
| 1640 | EVP_CIPHER_CTX_init(&ctx); |
| 1641 | HMAC_CTX_init(&hctx); |
| 1642 | /* Initialize HMAC and cipher contexts. If callback present |
| 1643 | * it does all the work otherwise use generated values |
| 1644 | * from parent ctx. |
| 1645 | */ |
| 1646 | if (tctx->tlsext_ticket_key_cb) |
| 1647 | { |
| 1648 | if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, |
| 1649 | &hctx, 1) < 0) |
| 1650 | { |
| 1651 | OPENSSL_free(senc); |
| 1652 | return -1; |
| 1653 | } |
| 1654 | } |
| 1655 | else |
| 1656 | { |
| 1657 | RAND_pseudo_bytes(iv, 16); |
| 1658 | EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, |
| 1659 | tctx->tlsext_tick_aes_key, iv); |
| 1660 | HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, |
| 1661 | tlsext_tick_md(), NULL); |
| 1662 | memcpy(key_name, tctx->tlsext_tick_key_name, 16); |
| 1663 | } |
| 1664 | l2n(s->session->tlsext_tick_lifetime_hint, p); |
| 1665 | /* Skip ticket length for now */ |
| 1666 | p += 2; |
| 1667 | /* Output key name */ |
| 1668 | macstart = p; |
| 1669 | memcpy(p, key_name, 16); |
| 1670 | p += 16; |
| 1671 | /* output IV */ |
| 1672 | memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx)); |
| 1673 | p += EVP_CIPHER_CTX_iv_length(&ctx); |
| 1674 | /* Encrypt session data */ |
| 1675 | EVP_EncryptUpdate(&ctx, p, &len, senc, slen); |
| 1676 | p += len; |
| 1677 | EVP_EncryptFinal(&ctx, p, &len); |
| 1678 | p += len; |
| 1679 | EVP_CIPHER_CTX_cleanup(&ctx); |
| 1680 | |
| 1681 | HMAC_Update(&hctx, macstart, p - macstart); |
| 1682 | HMAC_Final(&hctx, p, &hlen); |
| 1683 | HMAC_CTX_cleanup(&hctx); |
| 1684 | |
| 1685 | p += hlen; |
| 1686 | /* Now write out lengths: p points to end of data written */ |
| 1687 | /* Total length */ |
| 1688 | len = p - (unsigned char *)(s->init_buf->data); |
| 1689 | /* Ticket length */ |
| 1690 | p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4; |
| 1691 | s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p); |
| 1692 | |
| 1693 | /* number of bytes to write */ |
| 1694 | s->init_num= len; |
| 1695 | s->state=SSL3_ST_SW_SESSION_TICKET_B; |
| 1696 | s->init_off=0; |
| 1697 | OPENSSL_free(senc); |
| 1698 | |
| 1699 | /* XDTLS: set message header ? */ |
| 1700 | msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; |
| 1701 | dtls1_set_message_header(s, (void *)s->init_buf->data, |
| 1702 | SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len); |
| 1703 | |
| 1704 | /* buffer the message to handle re-xmits */ |
| 1705 | dtls1_buffer_message(s, 0); |
| 1706 | } |
| 1707 | |
| 1708 | /* SSL3_ST_SW_SESSION_TICKET_B */ |
| 1709 | return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); |
| 1710 | } |
| 1711 | #endif |