1160814Ssimon/* ssl/d1_srvr.c */ 2160814Ssimon/* 3160814Ssimon * DTLS implementation written by Nagendra Modadugu 4160814Ssimon * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. 5160814Ssimon */ 6160814Ssimon/* ==================================================================== 7238405Sjkim * Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved. 8160814Ssimon * 9160814Ssimon * Redistribution and use in source and binary forms, with or without 10160814Ssimon * modification, are permitted provided that the following conditions 11160814Ssimon * are met: 12160814Ssimon * 13160814Ssimon * 1. Redistributions of source code must retain the above copyright 14160814Ssimon * notice, this list of conditions and the following disclaimer. 15160814Ssimon * 16160814Ssimon * 2. Redistributions in binary form must reproduce the above copyright 17160814Ssimon * notice, this list of conditions and the following disclaimer in 18160814Ssimon * the documentation and/or other materials provided with the 19160814Ssimon * distribution. 20160814Ssimon * 21160814Ssimon * 3. All advertising materials mentioning features or use of this 22160814Ssimon * software must display the following acknowledgment: 23160814Ssimon * "This product includes software developed by the OpenSSL Project 24160814Ssimon * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25160814Ssimon * 26160814Ssimon * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27160814Ssimon * endorse or promote products derived from this software without 28160814Ssimon * prior written permission. For written permission, please contact 29160814Ssimon * openssl-core@OpenSSL.org. 30160814Ssimon * 31160814Ssimon * 5. Products derived from this software may not be called "OpenSSL" 32160814Ssimon * nor may "OpenSSL" appear in their names without prior written 33160814Ssimon * permission of the OpenSSL Project. 34160814Ssimon * 35160814Ssimon * 6. Redistributions of any form whatsoever must retain the following 36160814Ssimon * acknowledgment: 37160814Ssimon * "This product includes software developed by the OpenSSL Project 38160814Ssimon * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39160814Ssimon * 40160814Ssimon * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41160814Ssimon * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42160814Ssimon * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43160814Ssimon * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44160814Ssimon * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45160814Ssimon * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46160814Ssimon * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47160814Ssimon * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48160814Ssimon * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49160814Ssimon * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50160814Ssimon * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51160814Ssimon * OF THE POSSIBILITY OF SUCH DAMAGE. 52160814Ssimon * ==================================================================== 53160814Ssimon * 54160814Ssimon * This product includes cryptographic software written by Eric Young 55160814Ssimon * (eay@cryptsoft.com). This product includes software written by Tim 56160814Ssimon * Hudson (tjh@cryptsoft.com). 57160814Ssimon * 58160814Ssimon */ 59160814Ssimon/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 60160814Ssimon * All rights reserved. 61160814Ssimon * 62160814Ssimon * This package is an SSL implementation written 63160814Ssimon * by Eric Young (eay@cryptsoft.com). 64160814Ssimon * The implementation was written so as to conform with Netscapes SSL. 65160814Ssimon * 66160814Ssimon * This library is free for commercial and non-commercial use as long as 67160814Ssimon * the following conditions are aheared to. The following conditions 68160814Ssimon * apply to all code found in this distribution, be it the RC4, RSA, 69160814Ssimon * lhash, DES, etc., code; not just the SSL code. The SSL documentation 70160814Ssimon * included with this distribution is covered by the same copyright terms 71160814Ssimon * except that the holder is Tim Hudson (tjh@cryptsoft.com). 72160814Ssimon * 73160814Ssimon * Copyright remains Eric Young's, and as such any Copyright notices in 74160814Ssimon * the code are not to be removed. 75160814Ssimon * If this package is used in a product, Eric Young should be given attribution 76160814Ssimon * as the author of the parts of the library used. 77160814Ssimon * This can be in the form of a textual message at program startup or 78160814Ssimon * in documentation (online or textual) provided with the package. 79160814Ssimon * 80160814Ssimon * Redistribution and use in source and binary forms, with or without 81160814Ssimon * modification, are permitted provided that the following conditions 82160814Ssimon * are met: 83160814Ssimon * 1. Redistributions of source code must retain the copyright 84160814Ssimon * notice, this list of conditions and the following disclaimer. 85160814Ssimon * 2. Redistributions in binary form must reproduce the above copyright 86160814Ssimon * notice, this list of conditions and the following disclaimer in the 87160814Ssimon * documentation and/or other materials provided with the distribution. 88160814Ssimon * 3. All advertising materials mentioning features or use of this software 89160814Ssimon * must display the following acknowledgement: 90160814Ssimon * "This product includes cryptographic software written by 91160814Ssimon * Eric Young (eay@cryptsoft.com)" 92160814Ssimon * The word 'cryptographic' can be left out if the rouines from the library 93160814Ssimon * being used are not cryptographic related :-). 94160814Ssimon * 4. If you include any Windows specific code (or a derivative thereof) from 95160814Ssimon * the apps directory (application code) you must include an acknowledgement: 96160814Ssimon * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 97160814Ssimon * 98160814Ssimon * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 99160814Ssimon * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 100160814Ssimon * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 101160814Ssimon * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 102160814Ssimon * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 103160814Ssimon * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 104160814Ssimon * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 105160814Ssimon * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 106160814Ssimon * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 107160814Ssimon * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 108160814Ssimon * SUCH DAMAGE. 109160814Ssimon * 110160814Ssimon * The licence and distribution terms for any publically available version or 111160814Ssimon * derivative of this code cannot be changed. i.e. this code cannot simply be 112160814Ssimon * copied and put under another distribution licence 113160814Ssimon * [including the GNU Public Licence.] 114160814Ssimon */ 115160814Ssimon 116160814Ssimon#include <stdio.h> 117160814Ssimon#include "ssl_locl.h" 118160814Ssimon#include <openssl/buffer.h> 119160814Ssimon#include <openssl/rand.h> 120160814Ssimon#include <openssl/objects.h> 121160814Ssimon#include <openssl/evp.h> 122160814Ssimon#include <openssl/x509.h> 123160814Ssimon#include <openssl/md5.h> 124238405Sjkim#include <openssl/bn.h> 125160814Ssimon#ifndef OPENSSL_NO_DH 126160814Ssimon#include <openssl/dh.h> 127160814Ssimon#endif 128160814Ssimon 129238405Sjkimstatic const SSL_METHOD *dtls1_get_server_method(int ver); 130160814Ssimonstatic int dtls1_send_hello_verify_request(SSL *s); 131160814Ssimon 132238405Sjkimstatic const SSL_METHOD *dtls1_get_server_method(int ver) 133160814Ssimon { 134160814Ssimon if (ver == DTLS1_VERSION) 135160814Ssimon return(DTLSv1_server_method()); 136160814Ssimon else 137160814Ssimon return(NULL); 138160814Ssimon } 139160814Ssimon 140160814SsimonIMPLEMENT_dtls1_meth_func(DTLSv1_server_method, 141160814Ssimon dtls1_accept, 142160814Ssimon ssl_undefined_function, 143160814Ssimon dtls1_get_server_method) 144160814Ssimon 145160814Ssimonint dtls1_accept(SSL *s) 146160814Ssimon { 147160814Ssimon BUF_MEM *buf; 148238405Sjkim unsigned long Time=(unsigned long)time(NULL); 149160814Ssimon void (*cb)(const SSL *ssl,int type,int val)=NULL; 150238405Sjkim unsigned long alg_k; 151160814Ssimon int ret= -1; 152160814Ssimon int new_state,state,skip=0; 153237657Sjkim int listen; 154238405Sjkim#ifndef OPENSSL_NO_SCTP 155238405Sjkim unsigned char sctpauthkey[64]; 156238405Sjkim char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; 157238405Sjkim#endif 158160814Ssimon 159160814Ssimon RAND_add(&Time,sizeof(Time),0); 160160814Ssimon ERR_clear_error(); 161160814Ssimon clear_sys_error(); 162160814Ssimon 163160814Ssimon if (s->info_callback != NULL) 164160814Ssimon cb=s->info_callback; 165160814Ssimon else if (s->ctx->info_callback != NULL) 166160814Ssimon cb=s->ctx->info_callback; 167237657Sjkim 168237657Sjkim listen = s->d1->listen; 169160814Ssimon 170160814Ssimon /* init things to blank */ 171160814Ssimon s->in_handshake++; 172160814Ssimon if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 173160814Ssimon 174237657Sjkim s->d1->listen = listen; 175238405Sjkim#ifndef OPENSSL_NO_SCTP 176238405Sjkim /* Notify SCTP BIO socket to enter handshake 177238405Sjkim * mode and prevent stream identifier other 178238405Sjkim * than 0. Will be ignored if no SCTP is used. 179238405Sjkim */ 180238405Sjkim BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL); 181238405Sjkim#endif 182237657Sjkim 183160814Ssimon if (s->cert == NULL) 184160814Ssimon { 185160814Ssimon SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET); 186160814Ssimon return(-1); 187160814Ssimon } 188160814Ssimon 189238405Sjkim#ifndef OPENSSL_NO_HEARTBEATS 190238405Sjkim /* If we're awaiting a HeartbeatResponse, pretend we 191238405Sjkim * already got and don't await it anymore, because 192238405Sjkim * Heartbeats don't make sense during handshakes anyway. 193238405Sjkim */ 194238405Sjkim if (s->tlsext_hb_pending) 195238405Sjkim { 196238405Sjkim dtls1_stop_timer(s); 197238405Sjkim s->tlsext_hb_pending = 0; 198238405Sjkim s->tlsext_hb_seq++; 199238405Sjkim } 200238405Sjkim#endif 201238405Sjkim 202160814Ssimon for (;;) 203160814Ssimon { 204160814Ssimon state=s->state; 205160814Ssimon 206160814Ssimon switch (s->state) 207160814Ssimon { 208160814Ssimon case SSL_ST_RENEGOTIATE: 209238405Sjkim s->renegotiate=1; 210160814Ssimon /* s->state=SSL_ST_ACCEPT; */ 211160814Ssimon 212160814Ssimon case SSL_ST_BEFORE: 213160814Ssimon case SSL_ST_ACCEPT: 214160814Ssimon case SSL_ST_BEFORE|SSL_ST_ACCEPT: 215160814Ssimon case SSL_ST_OK|SSL_ST_ACCEPT: 216160814Ssimon 217160814Ssimon s->server=1; 218160814Ssimon if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 219160814Ssimon 220160814Ssimon if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) 221160814Ssimon { 222160814Ssimon SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR); 223160814Ssimon return -1; 224160814Ssimon } 225160814Ssimon s->type=SSL_ST_ACCEPT; 226160814Ssimon 227160814Ssimon if (s->init_buf == NULL) 228160814Ssimon { 229160814Ssimon if ((buf=BUF_MEM_new()) == NULL) 230160814Ssimon { 231160814Ssimon ret= -1; 232160814Ssimon goto end; 233160814Ssimon } 234160814Ssimon if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 235160814Ssimon { 236279264Sdelphij BUF_MEM_free(buf); 237160814Ssimon ret= -1; 238160814Ssimon goto end; 239160814Ssimon } 240160814Ssimon s->init_buf=buf; 241160814Ssimon } 242160814Ssimon 243160814Ssimon if (!ssl3_setup_buffers(s)) 244160814Ssimon { 245160814Ssimon ret= -1; 246160814Ssimon goto end; 247160814Ssimon } 248160814Ssimon 249160814Ssimon s->init_num=0; 250279264Sdelphij s->d1->change_cipher_spec_ok = 0; 251279264Sdelphij /* Should have been reset by ssl3_get_finished, too. */ 252279264Sdelphij s->s3->change_cipher_spec = 0; 253160814Ssimon 254160814Ssimon if (s->state != SSL_ST_RENEGOTIATE) 255160814Ssimon { 256160814Ssimon /* Ok, we now need to push on a buffering BIO so that 257160814Ssimon * the output is sent in a way that TCP likes :-) 258238405Sjkim * ...but not with SCTP :-) 259160814Ssimon */ 260238405Sjkim#ifndef OPENSSL_NO_SCTP 261238405Sjkim if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) 262238405Sjkim#endif 263238405Sjkim if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; } 264160814Ssimon 265160814Ssimon ssl3_init_finished_mac(s); 266160814Ssimon s->state=SSL3_ST_SR_CLNT_HELLO_A; 267160814Ssimon s->ctx->stats.sess_accept++; 268160814Ssimon } 269160814Ssimon else 270160814Ssimon { 271160814Ssimon /* s->state == SSL_ST_RENEGOTIATE, 272160814Ssimon * we will just send a HelloRequest */ 273160814Ssimon s->ctx->stats.sess_accept_renegotiate++; 274160814Ssimon s->state=SSL3_ST_SW_HELLO_REQ_A; 275160814Ssimon } 276160814Ssimon 277160814Ssimon break; 278160814Ssimon 279160814Ssimon case SSL3_ST_SW_HELLO_REQ_A: 280160814Ssimon case SSL3_ST_SW_HELLO_REQ_B: 281160814Ssimon 282160814Ssimon s->shutdown=0; 283279264Sdelphij dtls1_clear_record_buffer(s); 284205128Ssimon dtls1_start_timer(s); 285160814Ssimon ret=dtls1_send_hello_request(s); 286160814Ssimon if (ret <= 0) goto end; 287279264Sdelphij s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A; 288160814Ssimon s->state=SSL3_ST_SW_FLUSH; 289160814Ssimon s->init_num=0; 290160814Ssimon 291160814Ssimon ssl3_init_finished_mac(s); 292160814Ssimon break; 293160814Ssimon 294160814Ssimon case SSL3_ST_SW_HELLO_REQ_C: 295160814Ssimon s->state=SSL_ST_OK; 296160814Ssimon break; 297160814Ssimon 298160814Ssimon case SSL3_ST_SR_CLNT_HELLO_A: 299160814Ssimon case SSL3_ST_SR_CLNT_HELLO_B: 300160814Ssimon case SSL3_ST_SR_CLNT_HELLO_C: 301160814Ssimon 302160814Ssimon s->shutdown=0; 303160814Ssimon ret=ssl3_get_client_hello(s); 304160814Ssimon if (ret <= 0) goto end; 305205128Ssimon dtls1_stop_timer(s); 306160814Ssimon 307205128Ssimon if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 308160814Ssimon s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 309160814Ssimon else 310160814Ssimon s->state = SSL3_ST_SW_SRVR_HELLO_A; 311160814Ssimon 312160814Ssimon s->init_num=0; 313205128Ssimon 314237657Sjkim /* Reflect ClientHello sequence to remain stateless while listening */ 315237657Sjkim if (listen) 316237657Sjkim { 317237657Sjkim memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence)); 318237657Sjkim } 319237657Sjkim 320205128Ssimon /* If we're just listening, stop here */ 321237657Sjkim if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) 322205128Ssimon { 323205128Ssimon ret = 2; 324205128Ssimon s->d1->listen = 0; 325237657Sjkim /* Set expected sequence numbers 326237657Sjkim * to continue the handshake. 327237657Sjkim */ 328237657Sjkim s->d1->handshake_read_seq = 2; 329237657Sjkim s->d1->handshake_write_seq = 1; 330237657Sjkim s->d1->next_handshake_write_seq = 1; 331205128Ssimon goto end; 332205128Ssimon } 333205128Ssimon 334160814Ssimon break; 335160814Ssimon 336160814Ssimon case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 337160814Ssimon case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 338160814Ssimon 339160814Ssimon ret = dtls1_send_hello_verify_request(s); 340160814Ssimon if ( ret <= 0) goto end; 341160814Ssimon s->state=SSL3_ST_SW_FLUSH; 342160814Ssimon s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A; 343194206Ssimon 344238405Sjkim /* HelloVerifyRequest resets Finished MAC */ 345238405Sjkim if (s->version != DTLS1_BAD_VER) 346194206Ssimon ssl3_init_finished_mac(s); 347160814Ssimon break; 348160814Ssimon 349238405Sjkim#ifndef OPENSSL_NO_SCTP 350238405Sjkim case DTLS1_SCTP_ST_SR_READ_SOCK: 351238405Sjkim 352238405Sjkim if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) 353238405Sjkim { 354238405Sjkim s->s3->in_read_app_data=2; 355238405Sjkim s->rwstate=SSL_READING; 356238405Sjkim BIO_clear_retry_flags(SSL_get_rbio(s)); 357238405Sjkim BIO_set_retry_read(SSL_get_rbio(s)); 358238405Sjkim ret = -1; 359238405Sjkim goto end; 360238405Sjkim } 361238405Sjkim 362238405Sjkim s->state=SSL3_ST_SR_FINISHED_A; 363238405Sjkim break; 364238405Sjkim 365238405Sjkim case DTLS1_SCTP_ST_SW_WRITE_SOCK: 366238405Sjkim ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 367238405Sjkim if (ret < 0) goto end; 368238405Sjkim 369238405Sjkim if (ret == 0) 370238405Sjkim { 371238405Sjkim if (s->d1->next_state != SSL_ST_OK) 372238405Sjkim { 373238405Sjkim s->s3->in_read_app_data=2; 374238405Sjkim s->rwstate=SSL_READING; 375238405Sjkim BIO_clear_retry_flags(SSL_get_rbio(s)); 376238405Sjkim BIO_set_retry_read(SSL_get_rbio(s)); 377238405Sjkim ret = -1; 378238405Sjkim goto end; 379238405Sjkim } 380238405Sjkim } 381238405Sjkim 382238405Sjkim s->state=s->d1->next_state; 383238405Sjkim break; 384238405Sjkim#endif 385238405Sjkim 386160814Ssimon case SSL3_ST_SW_SRVR_HELLO_A: 387160814Ssimon case SSL3_ST_SW_SRVR_HELLO_B: 388238405Sjkim s->renegotiate = 2; 389205128Ssimon dtls1_start_timer(s); 390160814Ssimon ret=dtls1_send_server_hello(s); 391160814Ssimon if (ret <= 0) goto end; 392160814Ssimon 393160814Ssimon if (s->hit) 394205128Ssimon { 395238405Sjkim#ifndef OPENSSL_NO_SCTP 396238405Sjkim /* Add new shared key for SCTP-Auth, 397238405Sjkim * will be ignored if no SCTP used. 398238405Sjkim */ 399238405Sjkim snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 400238405Sjkim DTLS1_SCTP_AUTH_LABEL); 401238405Sjkim 402238405Sjkim SSL_export_keying_material(s, sctpauthkey, 403238405Sjkim sizeof(sctpauthkey), labelbuffer, 404238405Sjkim sizeof(labelbuffer), NULL, 0, 0); 405238405Sjkim 406238405Sjkim BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 407238405Sjkim sizeof(sctpauthkey), sctpauthkey); 408238405Sjkim#endif 409238405Sjkim#ifndef OPENSSL_NO_TLSEXT 410205128Ssimon if (s->tlsext_ticket_expected) 411205128Ssimon s->state=SSL3_ST_SW_SESSION_TICKET_A; 412205128Ssimon else 413205128Ssimon s->state=SSL3_ST_SW_CHANGE_A; 414205128Ssimon#else 415238405Sjkim s->state=SSL3_ST_SW_CHANGE_A; 416205128Ssimon#endif 417238405Sjkim } 418160814Ssimon else 419160814Ssimon s->state=SSL3_ST_SW_CERT_A; 420160814Ssimon s->init_num=0; 421160814Ssimon break; 422160814Ssimon 423160814Ssimon case SSL3_ST_SW_CERT_A: 424160814Ssimon case SSL3_ST_SW_CERT_B: 425238405Sjkim /* Check if it is anon DH or normal PSK */ 426238405Sjkim if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 427238405Sjkim && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 428160814Ssimon { 429205128Ssimon dtls1_start_timer(s); 430160814Ssimon ret=dtls1_send_server_certificate(s); 431160814Ssimon if (ret <= 0) goto end; 432205128Ssimon#ifndef OPENSSL_NO_TLSEXT 433205128Ssimon if (s->tlsext_status_expected) 434205128Ssimon s->state=SSL3_ST_SW_CERT_STATUS_A; 435205128Ssimon else 436205128Ssimon s->state=SSL3_ST_SW_KEY_EXCH_A; 437160814Ssimon } 438160814Ssimon else 439205128Ssimon { 440205128Ssimon skip = 1; 441205128Ssimon s->state=SSL3_ST_SW_KEY_EXCH_A; 442205128Ssimon } 443205128Ssimon#else 444205128Ssimon } 445205128Ssimon else 446160814Ssimon skip=1; 447205128Ssimon 448160814Ssimon s->state=SSL3_ST_SW_KEY_EXCH_A; 449205128Ssimon#endif 450160814Ssimon s->init_num=0; 451160814Ssimon break; 452160814Ssimon 453160814Ssimon case SSL3_ST_SW_KEY_EXCH_A: 454160814Ssimon case SSL3_ST_SW_KEY_EXCH_B: 455238405Sjkim alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 456160814Ssimon 457277195Sdelphij /* 458277195Sdelphij * clear this, it may get reset by 459277195Sdelphij * send_server_key_exchange 460277195Sdelphij */ 461277195Sdelphij s->s3->tmp.use_rsa_tmp=0; 462160814Ssimon 463238405Sjkim /* only send if a DH key exchange or 464160814Ssimon * RSA but we have a sign only certificate */ 465277195Sdelphij if (0 466238405Sjkim /* PSK: send ServerKeyExchange if PSK identity 467238405Sjkim * hint if provided */ 468238405Sjkim#ifndef OPENSSL_NO_PSK 469238405Sjkim || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint) 470238405Sjkim#endif 471238405Sjkim || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 472238405Sjkim || (alg_k & SSL_kEECDH) 473238405Sjkim || ((alg_k & SSL_kRSA) 474160814Ssimon && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL 475160814Ssimon || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) 476160814Ssimon && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) 477160814Ssimon ) 478160814Ssimon ) 479160814Ssimon ) 480160814Ssimon ) 481160814Ssimon { 482205128Ssimon dtls1_start_timer(s); 483160814Ssimon ret=dtls1_send_server_key_exchange(s); 484160814Ssimon if (ret <= 0) goto end; 485160814Ssimon } 486160814Ssimon else 487160814Ssimon skip=1; 488160814Ssimon 489160814Ssimon s->state=SSL3_ST_SW_CERT_REQ_A; 490160814Ssimon s->init_num=0; 491160814Ssimon break; 492160814Ssimon 493160814Ssimon case SSL3_ST_SW_CERT_REQ_A: 494160814Ssimon case SSL3_ST_SW_CERT_REQ_B: 495160814Ssimon if (/* don't request cert unless asked for it: */ 496160814Ssimon !(s->verify_mode & SSL_VERIFY_PEER) || 497160814Ssimon /* if SSL_VERIFY_CLIENT_ONCE is set, 498160814Ssimon * don't request cert during re-negotiation: */ 499160814Ssimon ((s->session->peer != NULL) && 500160814Ssimon (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 501160814Ssimon /* never request cert in anonymous ciphersuites 502160814Ssimon * (see section "Certificate request" in SSL 3 drafts 503160814Ssimon * and in RFC 2246): */ 504238405Sjkim ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 505160814Ssimon /* ... except when the application insists on verification 506160814Ssimon * (against the specs, but s3_clnt.c accepts this for SSL 3) */ 507160814Ssimon !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || 508238405Sjkim /* never request cert in Kerberos ciphersuites */ 509238405Sjkim (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) 510238405Sjkim /* With normal PSK Certificates and 511238405Sjkim * Certificate Requests are omitted */ 512238405Sjkim || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 513160814Ssimon { 514160814Ssimon /* no cert request */ 515160814Ssimon skip=1; 516160814Ssimon s->s3->tmp.cert_request=0; 517160814Ssimon s->state=SSL3_ST_SW_SRVR_DONE_A; 518238405Sjkim#ifndef OPENSSL_NO_SCTP 519238405Sjkim if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 520238405Sjkim { 521238405Sjkim s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 522238405Sjkim s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 523238405Sjkim } 524238405Sjkim#endif 525160814Ssimon } 526160814Ssimon else 527160814Ssimon { 528160814Ssimon s->s3->tmp.cert_request=1; 529205128Ssimon dtls1_start_timer(s); 530160814Ssimon ret=dtls1_send_certificate_request(s); 531160814Ssimon if (ret <= 0) goto end; 532160814Ssimon#ifndef NETSCAPE_HANG_BUG 533160814Ssimon s->state=SSL3_ST_SW_SRVR_DONE_A; 534238405Sjkim#ifndef OPENSSL_NO_SCTP 535238405Sjkim if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 536238405Sjkim { 537238405Sjkim s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 538238405Sjkim s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 539238405Sjkim } 540238405Sjkim#endif 541160814Ssimon#else 542160814Ssimon s->state=SSL3_ST_SW_FLUSH; 543160814Ssimon s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 544238405Sjkim#ifndef OPENSSL_NO_SCTP 545238405Sjkim if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 546238405Sjkim { 547238405Sjkim s->d1->next_state = s->s3->tmp.next_state; 548238405Sjkim s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK; 549238405Sjkim } 550160814Ssimon#endif 551238405Sjkim#endif 552160814Ssimon s->init_num=0; 553160814Ssimon } 554160814Ssimon break; 555160814Ssimon 556160814Ssimon case SSL3_ST_SW_SRVR_DONE_A: 557160814Ssimon case SSL3_ST_SW_SRVR_DONE_B: 558205128Ssimon dtls1_start_timer(s); 559160814Ssimon ret=dtls1_send_server_done(s); 560160814Ssimon if (ret <= 0) goto end; 561160814Ssimon s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 562160814Ssimon s->state=SSL3_ST_SW_FLUSH; 563160814Ssimon s->init_num=0; 564160814Ssimon break; 565160814Ssimon 566160814Ssimon case SSL3_ST_SW_FLUSH: 567205128Ssimon s->rwstate=SSL_WRITING; 568205128Ssimon if (BIO_flush(s->wbio) <= 0) 569160814Ssimon { 570238405Sjkim /* If the write error was fatal, stop trying */ 571238405Sjkim if (!BIO_should_retry(s->wbio)) 572238405Sjkim { 573238405Sjkim s->rwstate=SSL_NOTHING; 574238405Sjkim s->state=s->s3->tmp.next_state; 575238405Sjkim } 576238405Sjkim 577205128Ssimon ret= -1; 578205128Ssimon goto end; 579160814Ssimon } 580205128Ssimon s->rwstate=SSL_NOTHING; 581160814Ssimon s->state=s->s3->tmp.next_state; 582160814Ssimon break; 583160814Ssimon 584160814Ssimon case SSL3_ST_SR_CERT_A: 585160814Ssimon case SSL3_ST_SR_CERT_B: 586160814Ssimon /* Check for second client hello (MS SGC) */ 587160814Ssimon ret = ssl3_check_client_hello(s); 588160814Ssimon if (ret <= 0) 589160814Ssimon goto end; 590160814Ssimon if (ret == 2) 591237657Sjkim { 592237657Sjkim dtls1_stop_timer(s); 593160814Ssimon s->state = SSL3_ST_SR_CLNT_HELLO_C; 594237657Sjkim } 595160814Ssimon else { 596279264Sdelphij if (s->s3->tmp.cert_request) 597279264Sdelphij { 598279264Sdelphij ret=ssl3_get_client_certificate(s); 599279264Sdelphij if (ret <= 0) goto end; 600279264Sdelphij } 601160814Ssimon s->init_num=0; 602160814Ssimon s->state=SSL3_ST_SR_KEY_EXCH_A; 603160814Ssimon } 604160814Ssimon break; 605160814Ssimon 606160814Ssimon case SSL3_ST_SR_KEY_EXCH_A: 607160814Ssimon case SSL3_ST_SR_KEY_EXCH_B: 608160814Ssimon ret=ssl3_get_client_key_exchange(s); 609160814Ssimon if (ret <= 0) goto end; 610238405Sjkim#ifndef OPENSSL_NO_SCTP 611238405Sjkim /* Add new shared key for SCTP-Auth, 612238405Sjkim * will be ignored if no SCTP used. 613238405Sjkim */ 614238405Sjkim snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 615238405Sjkim DTLS1_SCTP_AUTH_LABEL); 616238405Sjkim 617238405Sjkim SSL_export_keying_material(s, sctpauthkey, 618238405Sjkim sizeof(sctpauthkey), labelbuffer, 619238405Sjkim sizeof(labelbuffer), NULL, 0, 0); 620238405Sjkim 621238405Sjkim BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 622238405Sjkim sizeof(sctpauthkey), sctpauthkey); 623238405Sjkim#endif 624238405Sjkim 625160814Ssimon s->state=SSL3_ST_SR_CERT_VRFY_A; 626160814Ssimon s->init_num=0; 627160814Ssimon 628238405Sjkim if (ret == 2) 629238405Sjkim { 630238405Sjkim /* For the ECDH ciphersuites when 631238405Sjkim * the client sends its ECDH pub key in 632238405Sjkim * a certificate, the CertificateVerify 633238405Sjkim * message is not sent. 634238405Sjkim */ 635238405Sjkim s->state=SSL3_ST_SR_FINISHED_A; 636238405Sjkim s->init_num = 0; 637238405Sjkim } 638238405Sjkim else 639238405Sjkim { 640238405Sjkim s->state=SSL3_ST_SR_CERT_VRFY_A; 641238405Sjkim s->init_num=0; 642160814Ssimon 643238405Sjkim /* We need to get hashes here so if there is 644238405Sjkim * a client cert, it can be verified */ 645238405Sjkim s->method->ssl3_enc->cert_verify_mac(s, 646238405Sjkim NID_md5, 647238405Sjkim &(s->s3->tmp.cert_verify_md[0])); 648238405Sjkim s->method->ssl3_enc->cert_verify_mac(s, 649238405Sjkim NID_sha1, 650238405Sjkim &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH])); 651238405Sjkim } 652160814Ssimon break; 653160814Ssimon 654160814Ssimon case SSL3_ST_SR_CERT_VRFY_A: 655160814Ssimon case SSL3_ST_SR_CERT_VRFY_B: 656279264Sdelphij /* 657279264Sdelphij * This *should* be the first time we enable CCS, but be 658279264Sdelphij * extra careful about surrounding code changes. We need 659279264Sdelphij * to set this here because we don't know if we're 660279264Sdelphij * expecting a CertificateVerify or not. 661279264Sdelphij */ 662279264Sdelphij if (!s->s3->change_cipher_spec) 663279264Sdelphij s->d1->change_cipher_spec_ok = 1; 664160814Ssimon /* we should decide if we expected this one */ 665160814Ssimon ret=ssl3_get_cert_verify(s); 666160814Ssimon if (ret <= 0) goto end; 667238405Sjkim#ifndef OPENSSL_NO_SCTP 668238405Sjkim if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 669238405Sjkim state == SSL_ST_RENEGOTIATE) 670238405Sjkim s->state=DTLS1_SCTP_ST_SR_READ_SOCK; 671238405Sjkim else 672238405Sjkim#endif 673238405Sjkim s->state=SSL3_ST_SR_FINISHED_A; 674160814Ssimon s->init_num=0; 675160814Ssimon break; 676160814Ssimon 677160814Ssimon case SSL3_ST_SR_FINISHED_A: 678160814Ssimon case SSL3_ST_SR_FINISHED_B: 679279264Sdelphij /* 680279264Sdelphij * Enable CCS for resumed handshakes. 681279264Sdelphij * In a full handshake, we end up here through 682279264Sdelphij * SSL3_ST_SR_CERT_VRFY_B, so change_cipher_spec_ok was 683279264Sdelphij * already set. Receiving a CCS clears the flag, so make 684279264Sdelphij * sure not to re-enable it to ban duplicates. 685279264Sdelphij * s->s3->change_cipher_spec is set when a CCS is 686279264Sdelphij * processed in d1_pkt.c, and remains set until 687279264Sdelphij * the client's Finished message is read. 688279264Sdelphij */ 689279264Sdelphij if (!s->s3->change_cipher_spec) 690279264Sdelphij s->d1->change_cipher_spec_ok = 1; 691160814Ssimon ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A, 692160814Ssimon SSL3_ST_SR_FINISHED_B); 693160814Ssimon if (ret <= 0) goto end; 694205128Ssimon dtls1_stop_timer(s); 695160814Ssimon if (s->hit) 696160814Ssimon s->state=SSL_ST_OK; 697205128Ssimon#ifndef OPENSSL_NO_TLSEXT 698205128Ssimon else if (s->tlsext_ticket_expected) 699205128Ssimon s->state=SSL3_ST_SW_SESSION_TICKET_A; 700205128Ssimon#endif 701160814Ssimon else 702160814Ssimon s->state=SSL3_ST_SW_CHANGE_A; 703160814Ssimon s->init_num=0; 704160814Ssimon break; 705160814Ssimon 706205128Ssimon#ifndef OPENSSL_NO_TLSEXT 707205128Ssimon case SSL3_ST_SW_SESSION_TICKET_A: 708205128Ssimon case SSL3_ST_SW_SESSION_TICKET_B: 709205128Ssimon ret=dtls1_send_newsession_ticket(s); 710205128Ssimon if (ret <= 0) goto end; 711205128Ssimon s->state=SSL3_ST_SW_CHANGE_A; 712205128Ssimon s->init_num=0; 713205128Ssimon break; 714205128Ssimon 715205128Ssimon case SSL3_ST_SW_CERT_STATUS_A: 716205128Ssimon case SSL3_ST_SW_CERT_STATUS_B: 717205128Ssimon ret=ssl3_send_cert_status(s); 718205128Ssimon if (ret <= 0) goto end; 719205128Ssimon s->state=SSL3_ST_SW_KEY_EXCH_A; 720205128Ssimon s->init_num=0; 721205128Ssimon break; 722205128Ssimon 723205128Ssimon#endif 724205128Ssimon 725160814Ssimon case SSL3_ST_SW_CHANGE_A: 726160814Ssimon case SSL3_ST_SW_CHANGE_B: 727160814Ssimon 728160814Ssimon s->session->cipher=s->s3->tmp.new_cipher; 729160814Ssimon if (!s->method->ssl3_enc->setup_key_block(s)) 730160814Ssimon { ret= -1; goto end; } 731160814Ssimon 732160814Ssimon ret=dtls1_send_change_cipher_spec(s, 733160814Ssimon SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B); 734160814Ssimon 735160814Ssimon if (ret <= 0) goto end; 736238405Sjkim 737238405Sjkim#ifndef OPENSSL_NO_SCTP 738279264Sdelphij if (!s->hit) 739279264Sdelphij { 740279264Sdelphij /* Change to new shared key of SCTP-Auth, 741279264Sdelphij * will be ignored if no SCTP used. 742279264Sdelphij */ 743279264Sdelphij BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 744279264Sdelphij } 745238405Sjkim#endif 746238405Sjkim 747160814Ssimon s->state=SSL3_ST_SW_FINISHED_A; 748160814Ssimon s->init_num=0; 749160814Ssimon 750160814Ssimon if (!s->method->ssl3_enc->change_cipher_state(s, 751160814Ssimon SSL3_CHANGE_CIPHER_SERVER_WRITE)) 752160814Ssimon { 753160814Ssimon ret= -1; 754160814Ssimon goto end; 755160814Ssimon } 756160814Ssimon 757160814Ssimon dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 758160814Ssimon break; 759160814Ssimon 760160814Ssimon case SSL3_ST_SW_FINISHED_A: 761160814Ssimon case SSL3_ST_SW_FINISHED_B: 762160814Ssimon ret=dtls1_send_finished(s, 763160814Ssimon SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B, 764160814Ssimon s->method->ssl3_enc->server_finished_label, 765160814Ssimon s->method->ssl3_enc->server_finished_label_len); 766160814Ssimon if (ret <= 0) goto end; 767160814Ssimon s->state=SSL3_ST_SW_FLUSH; 768160814Ssimon if (s->hit) 769279264Sdelphij { 770160814Ssimon s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A; 771279264Sdelphij 772279264Sdelphij#ifndef OPENSSL_NO_SCTP 773279264Sdelphij /* Change to new shared key of SCTP-Auth, 774279264Sdelphij * will be ignored if no SCTP used. 775279264Sdelphij */ 776279264Sdelphij BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 777279264Sdelphij#endif 778279264Sdelphij } 779160814Ssimon else 780238405Sjkim { 781160814Ssimon s->s3->tmp.next_state=SSL_ST_OK; 782238405Sjkim#ifndef OPENSSL_NO_SCTP 783238405Sjkim if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 784238405Sjkim { 785238405Sjkim s->d1->next_state = s->s3->tmp.next_state; 786238405Sjkim s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK; 787238405Sjkim } 788238405Sjkim#endif 789238405Sjkim } 790160814Ssimon s->init_num=0; 791160814Ssimon break; 792160814Ssimon 793160814Ssimon case SSL_ST_OK: 794160814Ssimon /* clean a few things up */ 795160814Ssimon ssl3_cleanup_key_block(s); 796160814Ssimon 797160814Ssimon#if 0 798160814Ssimon BUF_MEM_free(s->init_buf); 799160814Ssimon s->init_buf=NULL; 800160814Ssimon#endif 801160814Ssimon 802160814Ssimon /* remove buffering on output */ 803160814Ssimon ssl_free_wbio_buffer(s); 804160814Ssimon 805160814Ssimon s->init_num=0; 806160814Ssimon 807238405Sjkim if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */ 808160814Ssimon { 809238405Sjkim s->renegotiate=0; 810160814Ssimon s->new_session=0; 811160814Ssimon 812160814Ssimon ssl_update_cache(s,SSL_SESS_CACHE_SERVER); 813160814Ssimon 814160814Ssimon s->ctx->stats.sess_accept_good++; 815160814Ssimon /* s->server=1; */ 816160814Ssimon s->handshake_func=dtls1_accept; 817160814Ssimon 818160814Ssimon if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 819160814Ssimon } 820160814Ssimon 821160814Ssimon ret = 1; 822160814Ssimon 823160814Ssimon /* done handshaking, next message is client hello */ 824160814Ssimon s->d1->handshake_read_seq = 0; 825160814Ssimon /* next message is server hello */ 826160814Ssimon s->d1->handshake_write_seq = 0; 827205128Ssimon s->d1->next_handshake_write_seq = 0; 828160814Ssimon goto end; 829160814Ssimon /* break; */ 830160814Ssimon 831160814Ssimon default: 832160814Ssimon SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE); 833160814Ssimon ret= -1; 834160814Ssimon goto end; 835160814Ssimon /* break; */ 836160814Ssimon } 837160814Ssimon 838160814Ssimon if (!s->s3->tmp.reuse_message && !skip) 839160814Ssimon { 840160814Ssimon if (s->debug) 841160814Ssimon { 842160814Ssimon if ((ret=BIO_flush(s->wbio)) <= 0) 843160814Ssimon goto end; 844160814Ssimon } 845160814Ssimon 846160814Ssimon 847160814Ssimon if ((cb != NULL) && (s->state != state)) 848160814Ssimon { 849160814Ssimon new_state=s->state; 850160814Ssimon s->state=state; 851160814Ssimon cb(s,SSL_CB_ACCEPT_LOOP,1); 852160814Ssimon s->state=new_state; 853160814Ssimon } 854160814Ssimon } 855160814Ssimon skip=0; 856160814Ssimon } 857160814Ssimonend: 858160814Ssimon /* BIO_flush(s->wbio); */ 859160814Ssimon 860160814Ssimon s->in_handshake--; 861238405Sjkim#ifndef OPENSSL_NO_SCTP 862238405Sjkim /* Notify SCTP BIO socket to leave handshake 863238405Sjkim * mode and prevent stream identifier other 864238405Sjkim * than 0. Will be ignored if no SCTP is used. 865238405Sjkim */ 866238405Sjkim BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL); 867238405Sjkim#endif 868238405Sjkim 869160814Ssimon if (cb != NULL) 870160814Ssimon cb(s,SSL_CB_ACCEPT_EXIT,ret); 871160814Ssimon return(ret); 872160814Ssimon } 873160814Ssimon 874160814Ssimonint dtls1_send_hello_request(SSL *s) 875160814Ssimon { 876160814Ssimon unsigned char *p; 877160814Ssimon 878160814Ssimon if (s->state == SSL3_ST_SW_HELLO_REQ_A) 879160814Ssimon { 880160814Ssimon p=(unsigned char *)s->init_buf->data; 881160814Ssimon p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0); 882160814Ssimon 883160814Ssimon s->state=SSL3_ST_SW_HELLO_REQ_B; 884160814Ssimon /* number of bytes to write */ 885160814Ssimon s->init_num=DTLS1_HM_HEADER_LENGTH; 886160814Ssimon s->init_off=0; 887160814Ssimon 888160814Ssimon /* no need to buffer this message, since there are no retransmit 889160814Ssimon * requests for it */ 890160814Ssimon } 891160814Ssimon 892160814Ssimon /* SSL3_ST_SW_HELLO_REQ_B */ 893160814Ssimon return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 894160814Ssimon } 895160814Ssimon 896160814Ssimonint dtls1_send_hello_verify_request(SSL *s) 897160814Ssimon { 898160814Ssimon unsigned int msg_len; 899160814Ssimon unsigned char *msg, *buf, *p; 900160814Ssimon 901160814Ssimon if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) 902160814Ssimon { 903160814Ssimon buf = (unsigned char *)s->init_buf->data; 904160814Ssimon 905160814Ssimon msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 906238405Sjkim *(p++) = s->version >> 8; 907238405Sjkim *(p++) = s->version & 0xFF; 908160814Ssimon 909205128Ssimon if (s->ctx->app_gen_cookie_cb == NULL || 910205128Ssimon s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 911205128Ssimon &(s->d1->cookie_len)) == 0) 912194206Ssimon { 913160814Ssimon SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR); 914194206Ssimon return 0; 915194206Ssimon } 916160814Ssimon 917194206Ssimon *(p++) = (unsigned char) s->d1->cookie_len; 918160814Ssimon memcpy(p, s->d1->cookie, s->d1->cookie_len); 919160814Ssimon p += s->d1->cookie_len; 920160814Ssimon msg_len = p - msg; 921160814Ssimon 922160814Ssimon dtls1_set_message_header(s, buf, 923160814Ssimon DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len); 924160814Ssimon 925160814Ssimon s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 926160814Ssimon /* number of bytes to write */ 927160814Ssimon s->init_num=p-buf; 928160814Ssimon s->init_off=0; 929160814Ssimon } 930160814Ssimon 931160814Ssimon /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 932160814Ssimon return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 933160814Ssimon } 934160814Ssimon 935160814Ssimonint dtls1_send_server_hello(SSL *s) 936160814Ssimon { 937160814Ssimon unsigned char *buf; 938160814Ssimon unsigned char *p,*d; 939160814Ssimon int i; 940160814Ssimon unsigned int sl; 941279264Sdelphij unsigned long l; 942160814Ssimon 943160814Ssimon if (s->state == SSL3_ST_SW_SRVR_HELLO_A) 944160814Ssimon { 945160814Ssimon buf=(unsigned char *)s->init_buf->data; 946160814Ssimon p=s->s3->server_random; 947279264Sdelphij ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE); 948160814Ssimon /* Do the message type and length last */ 949160814Ssimon d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 950160814Ssimon 951238405Sjkim *(p++)=s->version>>8; 952238405Sjkim *(p++)=s->version&0xff; 953160814Ssimon 954160814Ssimon /* Random stuff */ 955160814Ssimon memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 956160814Ssimon p+=SSL3_RANDOM_SIZE; 957160814Ssimon 958160814Ssimon /* now in theory we have 3 options to sending back the 959160814Ssimon * session id. If it is a re-use, we send back the 960160814Ssimon * old session-id, if it is a new session, we send 961160814Ssimon * back the new session-id or we send back a 0 length 962160814Ssimon * session-id if we want it to be single use. 963160814Ssimon * Currently I will not implement the '0' length session-id 964160814Ssimon * 12-Jan-98 - I'll now support the '0' length stuff. 965160814Ssimon */ 966160814Ssimon if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) 967160814Ssimon s->session->session_id_length=0; 968160814Ssimon 969160814Ssimon sl=s->session->session_id_length; 970160814Ssimon if (sl > sizeof s->session->session_id) 971160814Ssimon { 972160814Ssimon SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 973160814Ssimon return -1; 974160814Ssimon } 975160814Ssimon *(p++)=sl; 976160814Ssimon memcpy(p,s->session->session_id,sl); 977160814Ssimon p+=sl; 978160814Ssimon 979160814Ssimon /* put the cipher */ 980205128Ssimon if (s->s3->tmp.new_cipher == NULL) 981205128Ssimon return -1; 982160814Ssimon i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p); 983160814Ssimon p+=i; 984160814Ssimon 985160814Ssimon /* put the compression method */ 986160814Ssimon#ifdef OPENSSL_NO_COMP 987160814Ssimon *(p++)=0; 988160814Ssimon#else 989160814Ssimon if (s->s3->tmp.new_compression == NULL) 990160814Ssimon *(p++)=0; 991160814Ssimon else 992160814Ssimon *(p++)=s->s3->tmp.new_compression->id; 993160814Ssimon#endif 994160814Ssimon 995205128Ssimon#ifndef OPENSSL_NO_TLSEXT 996279264Sdelphij if (ssl_prepare_serverhello_tlsext(s) <= 0) 997279264Sdelphij { 998279264Sdelphij SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT); 999279264Sdelphij return -1; 1000279264Sdelphij } 1001205128Ssimon if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 1002205128Ssimon { 1003205128Ssimon SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR); 1004205128Ssimon return -1; 1005205128Ssimon } 1006205128Ssimon#endif 1007205128Ssimon 1008160814Ssimon /* do the header */ 1009160814Ssimon l=(p-d); 1010160814Ssimon d=buf; 1011160814Ssimon 1012160814Ssimon d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l); 1013160814Ssimon 1014194206Ssimon s->state=SSL3_ST_SW_SRVR_HELLO_B; 1015160814Ssimon /* number of bytes to write */ 1016160814Ssimon s->init_num=p-buf; 1017160814Ssimon s->init_off=0; 1018160814Ssimon 1019160814Ssimon /* buffer the message to handle re-xmits */ 1020160814Ssimon dtls1_buffer_message(s, 0); 1021160814Ssimon } 1022160814Ssimon 1023194206Ssimon /* SSL3_ST_SW_SRVR_HELLO_B */ 1024160814Ssimon return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1025160814Ssimon } 1026160814Ssimon 1027160814Ssimonint dtls1_send_server_done(SSL *s) 1028160814Ssimon { 1029160814Ssimon unsigned char *p; 1030160814Ssimon 1031160814Ssimon if (s->state == SSL3_ST_SW_SRVR_DONE_A) 1032160814Ssimon { 1033160814Ssimon p=(unsigned char *)s->init_buf->data; 1034160814Ssimon 1035160814Ssimon /* do the header */ 1036160814Ssimon p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0); 1037160814Ssimon 1038160814Ssimon s->state=SSL3_ST_SW_SRVR_DONE_B; 1039160814Ssimon /* number of bytes to write */ 1040160814Ssimon s->init_num=DTLS1_HM_HEADER_LENGTH; 1041160814Ssimon s->init_off=0; 1042160814Ssimon 1043160814Ssimon /* buffer the message to handle re-xmits */ 1044160814Ssimon dtls1_buffer_message(s, 0); 1045160814Ssimon } 1046160814Ssimon 1047194206Ssimon /* SSL3_ST_SW_SRVR_DONE_B */ 1048160814Ssimon return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1049160814Ssimon } 1050160814Ssimon 1051160814Ssimonint dtls1_send_server_key_exchange(SSL *s) 1052160814Ssimon { 1053160814Ssimon#ifndef OPENSSL_NO_RSA 1054160814Ssimon unsigned char *q; 1055160814Ssimon int j,num; 1056160814Ssimon RSA *rsa; 1057160814Ssimon unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1058160814Ssimon unsigned int u; 1059160814Ssimon#endif 1060160814Ssimon#ifndef OPENSSL_NO_DH 1061160814Ssimon DH *dh=NULL,*dhp; 1062160814Ssimon#endif 1063238405Sjkim#ifndef OPENSSL_NO_ECDH 1064238405Sjkim EC_KEY *ecdh=NULL, *ecdhp; 1065238405Sjkim unsigned char *encodedPoint = NULL; 1066238405Sjkim int encodedlen = 0; 1067238405Sjkim int curve_id = 0; 1068238405Sjkim BN_CTX *bn_ctx = NULL; 1069238405Sjkim#endif 1070160814Ssimon EVP_PKEY *pkey; 1071160814Ssimon unsigned char *p,*d; 1072160814Ssimon int al,i; 1073160814Ssimon unsigned long type; 1074160814Ssimon int n; 1075160814Ssimon CERT *cert; 1076160814Ssimon BIGNUM *r[4]; 1077160814Ssimon int nr[4],kn; 1078160814Ssimon BUF_MEM *buf; 1079160814Ssimon EVP_MD_CTX md_ctx; 1080160814Ssimon 1081160814Ssimon EVP_MD_CTX_init(&md_ctx); 1082160814Ssimon if (s->state == SSL3_ST_SW_KEY_EXCH_A) 1083160814Ssimon { 1084238405Sjkim type=s->s3->tmp.new_cipher->algorithm_mkey; 1085160814Ssimon cert=s->cert; 1086160814Ssimon 1087160814Ssimon buf=s->init_buf; 1088160814Ssimon 1089160814Ssimon r[0]=r[1]=r[2]=r[3]=NULL; 1090160814Ssimon n=0; 1091160814Ssimon#ifndef OPENSSL_NO_RSA 1092160814Ssimon if (type & SSL_kRSA) 1093160814Ssimon { 1094160814Ssimon rsa=cert->rsa_tmp; 1095160814Ssimon if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) 1096160814Ssimon { 1097160814Ssimon rsa=s->cert->rsa_tmp_cb(s, 1098160814Ssimon SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1099160814Ssimon SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1100160814Ssimon if(rsa == NULL) 1101160814Ssimon { 1102160814Ssimon al=SSL_AD_HANDSHAKE_FAILURE; 1103160814Ssimon SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY); 1104160814Ssimon goto f_err; 1105160814Ssimon } 1106160814Ssimon RSA_up_ref(rsa); 1107160814Ssimon cert->rsa_tmp=rsa; 1108160814Ssimon } 1109160814Ssimon if (rsa == NULL) 1110160814Ssimon { 1111160814Ssimon al=SSL_AD_HANDSHAKE_FAILURE; 1112160814Ssimon SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY); 1113160814Ssimon goto f_err; 1114160814Ssimon } 1115160814Ssimon r[0]=rsa->n; 1116160814Ssimon r[1]=rsa->e; 1117160814Ssimon s->s3->tmp.use_rsa_tmp=1; 1118160814Ssimon } 1119160814Ssimon else 1120160814Ssimon#endif 1121160814Ssimon#ifndef OPENSSL_NO_DH 1122160814Ssimon if (type & SSL_kEDH) 1123160814Ssimon { 1124160814Ssimon dhp=cert->dh_tmp; 1125160814Ssimon if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) 1126160814Ssimon dhp=s->cert->dh_tmp_cb(s, 1127160814Ssimon SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1128160814Ssimon SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1129160814Ssimon if (dhp == NULL) 1130160814Ssimon { 1131160814Ssimon al=SSL_AD_HANDSHAKE_FAILURE; 1132160814Ssimon SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY); 1133160814Ssimon goto f_err; 1134160814Ssimon } 1135160814Ssimon 1136160814Ssimon if (s->s3->tmp.dh != NULL) 1137160814Ssimon { 1138160814Ssimon DH_free(dh); 1139160814Ssimon SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1140160814Ssimon goto err; 1141160814Ssimon } 1142160814Ssimon 1143160814Ssimon if ((dh=DHparams_dup(dhp)) == NULL) 1144160814Ssimon { 1145160814Ssimon SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 1146160814Ssimon goto err; 1147160814Ssimon } 1148160814Ssimon 1149160814Ssimon s->s3->tmp.dh=dh; 1150160814Ssimon if ((dhp->pub_key == NULL || 1151160814Ssimon dhp->priv_key == NULL || 1152160814Ssimon (s->options & SSL_OP_SINGLE_DH_USE))) 1153160814Ssimon { 1154160814Ssimon if(!DH_generate_key(dh)) 1155160814Ssimon { 1156160814Ssimon SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1157160814Ssimon ERR_R_DH_LIB); 1158160814Ssimon goto err; 1159160814Ssimon } 1160160814Ssimon } 1161160814Ssimon else 1162160814Ssimon { 1163160814Ssimon dh->pub_key=BN_dup(dhp->pub_key); 1164160814Ssimon dh->priv_key=BN_dup(dhp->priv_key); 1165160814Ssimon if ((dh->pub_key == NULL) || 1166160814Ssimon (dh->priv_key == NULL)) 1167160814Ssimon { 1168160814Ssimon SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 1169160814Ssimon goto err; 1170160814Ssimon } 1171160814Ssimon } 1172160814Ssimon r[0]=dh->p; 1173160814Ssimon r[1]=dh->g; 1174160814Ssimon r[2]=dh->pub_key; 1175160814Ssimon } 1176160814Ssimon else 1177160814Ssimon#endif 1178238405Sjkim#ifndef OPENSSL_NO_ECDH 1179238405Sjkim if (type & SSL_kEECDH) 1180160814Ssimon { 1181238405Sjkim const EC_GROUP *group; 1182238405Sjkim 1183238405Sjkim ecdhp=cert->ecdh_tmp; 1184238405Sjkim if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL)) 1185238405Sjkim { 1186238405Sjkim ecdhp=s->cert->ecdh_tmp_cb(s, 1187238405Sjkim SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1188238405Sjkim SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1189238405Sjkim } 1190238405Sjkim if (ecdhp == NULL) 1191238405Sjkim { 1192238405Sjkim al=SSL_AD_HANDSHAKE_FAILURE; 1193238405Sjkim SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY); 1194238405Sjkim goto f_err; 1195238405Sjkim } 1196238405Sjkim 1197238405Sjkim if (s->s3->tmp.ecdh != NULL) 1198238405Sjkim { 1199238405Sjkim EC_KEY_free(s->s3->tmp.ecdh); 1200238405Sjkim SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1201238405Sjkim goto err; 1202238405Sjkim } 1203238405Sjkim 1204238405Sjkim /* Duplicate the ECDH structure. */ 1205238405Sjkim if (ecdhp == NULL) 1206238405Sjkim { 1207238405Sjkim SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1208238405Sjkim goto err; 1209238405Sjkim } 1210238405Sjkim if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) 1211238405Sjkim { 1212238405Sjkim SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1213238405Sjkim goto err; 1214238405Sjkim } 1215238405Sjkim 1216238405Sjkim s->s3->tmp.ecdh=ecdh; 1217238405Sjkim if ((EC_KEY_get0_public_key(ecdh) == NULL) || 1218238405Sjkim (EC_KEY_get0_private_key(ecdh) == NULL) || 1219238405Sjkim (s->options & SSL_OP_SINGLE_ECDH_USE)) 1220238405Sjkim { 1221238405Sjkim if(!EC_KEY_generate_key(ecdh)) 1222238405Sjkim { 1223238405Sjkim SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1224238405Sjkim goto err; 1225238405Sjkim } 1226238405Sjkim } 1227238405Sjkim 1228238405Sjkim if (((group = EC_KEY_get0_group(ecdh)) == NULL) || 1229238405Sjkim (EC_KEY_get0_public_key(ecdh) == NULL) || 1230238405Sjkim (EC_KEY_get0_private_key(ecdh) == NULL)) 1231238405Sjkim { 1232238405Sjkim SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1233238405Sjkim goto err; 1234238405Sjkim } 1235238405Sjkim 1236238405Sjkim if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 1237238405Sjkim (EC_GROUP_get_degree(group) > 163)) 1238238405Sjkim { 1239238405Sjkim SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER); 1240238405Sjkim goto err; 1241238405Sjkim } 1242238405Sjkim 1243238405Sjkim /* XXX: For now, we only support ephemeral ECDH 1244238405Sjkim * keys over named (not generic) curves. For 1245238405Sjkim * supported named curves, curve_id is non-zero. 1246238405Sjkim */ 1247238405Sjkim if ((curve_id = 1248238405Sjkim tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group))) 1249238405Sjkim == 0) 1250238405Sjkim { 1251238405Sjkim SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1252238405Sjkim goto err; 1253238405Sjkim } 1254238405Sjkim 1255238405Sjkim /* Encode the public key. 1256238405Sjkim * First check the size of encoding and 1257238405Sjkim * allocate memory accordingly. 1258238405Sjkim */ 1259238405Sjkim encodedlen = EC_POINT_point2oct(group, 1260238405Sjkim EC_KEY_get0_public_key(ecdh), 1261238405Sjkim POINT_CONVERSION_UNCOMPRESSED, 1262238405Sjkim NULL, 0, NULL); 1263238405Sjkim 1264238405Sjkim encodedPoint = (unsigned char *) 1265238405Sjkim OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 1266238405Sjkim bn_ctx = BN_CTX_new(); 1267238405Sjkim if ((encodedPoint == NULL) || (bn_ctx == NULL)) 1268238405Sjkim { 1269238405Sjkim SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1270238405Sjkim goto err; 1271238405Sjkim } 1272238405Sjkim 1273238405Sjkim 1274238405Sjkim encodedlen = EC_POINT_point2oct(group, 1275238405Sjkim EC_KEY_get0_public_key(ecdh), 1276238405Sjkim POINT_CONVERSION_UNCOMPRESSED, 1277238405Sjkim encodedPoint, encodedlen, bn_ctx); 1278238405Sjkim 1279238405Sjkim if (encodedlen == 0) 1280238405Sjkim { 1281238405Sjkim SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1282238405Sjkim goto err; 1283238405Sjkim } 1284238405Sjkim 1285238405Sjkim BN_CTX_free(bn_ctx); bn_ctx=NULL; 1286238405Sjkim 1287238405Sjkim /* XXX: For now, we only support named (not 1288238405Sjkim * generic) curves in ECDH ephemeral key exchanges. 1289238405Sjkim * In this situation, we need four additional bytes 1290238405Sjkim * to encode the entire ServerECDHParams 1291238405Sjkim * structure. 1292238405Sjkim */ 1293238405Sjkim n = 4 + encodedlen; 1294238405Sjkim 1295238405Sjkim /* We'll generate the serverKeyExchange message 1296238405Sjkim * explicitly so we can set these to NULLs 1297238405Sjkim */ 1298238405Sjkim r[0]=NULL; 1299238405Sjkim r[1]=NULL; 1300238405Sjkim r[2]=NULL; 1301238405Sjkim r[3]=NULL; 1302238405Sjkim } 1303238405Sjkim else 1304238405Sjkim#endif /* !OPENSSL_NO_ECDH */ 1305238405Sjkim#ifndef OPENSSL_NO_PSK 1306238405Sjkim if (type & SSL_kPSK) 1307238405Sjkim { 1308238405Sjkim /* reserve size for record length and PSK identity hint*/ 1309238405Sjkim n+=2+strlen(s->ctx->psk_identity_hint); 1310238405Sjkim } 1311238405Sjkim else 1312238405Sjkim#endif /* !OPENSSL_NO_PSK */ 1313238405Sjkim { 1314160814Ssimon al=SSL_AD_HANDSHAKE_FAILURE; 1315160814Ssimon SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1316160814Ssimon goto f_err; 1317160814Ssimon } 1318160814Ssimon for (i=0; r[i] != NULL; i++) 1319160814Ssimon { 1320160814Ssimon nr[i]=BN_num_bytes(r[i]); 1321160814Ssimon n+=2+nr[i]; 1322160814Ssimon } 1323160814Ssimon 1324238405Sjkim if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 1325238405Sjkim && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 1326160814Ssimon { 1327238405Sjkim if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL)) 1328160814Ssimon == NULL) 1329160814Ssimon { 1330160814Ssimon al=SSL_AD_DECODE_ERROR; 1331160814Ssimon goto f_err; 1332160814Ssimon } 1333160814Ssimon kn=EVP_PKEY_size(pkey); 1334160814Ssimon } 1335160814Ssimon else 1336160814Ssimon { 1337160814Ssimon pkey=NULL; 1338160814Ssimon kn=0; 1339160814Ssimon } 1340160814Ssimon 1341160814Ssimon if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn)) 1342160814Ssimon { 1343160814Ssimon SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF); 1344160814Ssimon goto err; 1345160814Ssimon } 1346160814Ssimon d=(unsigned char *)s->init_buf->data; 1347160814Ssimon p= &(d[DTLS1_HM_HEADER_LENGTH]); 1348160814Ssimon 1349160814Ssimon for (i=0; r[i] != NULL; i++) 1350160814Ssimon { 1351160814Ssimon s2n(nr[i],p); 1352160814Ssimon BN_bn2bin(r[i],p); 1353160814Ssimon p+=nr[i]; 1354160814Ssimon } 1355160814Ssimon 1356238405Sjkim#ifndef OPENSSL_NO_ECDH 1357238405Sjkim if (type & SSL_kEECDH) 1358238405Sjkim { 1359238405Sjkim /* XXX: For now, we only support named (not generic) curves. 1360238405Sjkim * In this situation, the serverKeyExchange message has: 1361238405Sjkim * [1 byte CurveType], [2 byte CurveName] 1362238405Sjkim * [1 byte length of encoded point], followed by 1363238405Sjkim * the actual encoded point itself 1364238405Sjkim */ 1365238405Sjkim *p = NAMED_CURVE_TYPE; 1366238405Sjkim p += 1; 1367238405Sjkim *p = 0; 1368238405Sjkim p += 1; 1369238405Sjkim *p = curve_id; 1370238405Sjkim p += 1; 1371238405Sjkim *p = encodedlen; 1372238405Sjkim p += 1; 1373238405Sjkim memcpy((unsigned char*)p, 1374238405Sjkim (unsigned char *)encodedPoint, 1375238405Sjkim encodedlen); 1376238405Sjkim OPENSSL_free(encodedPoint); 1377279264Sdelphij encodedPoint = NULL; 1378238405Sjkim p += encodedlen; 1379238405Sjkim } 1380238405Sjkim#endif 1381238405Sjkim 1382238405Sjkim#ifndef OPENSSL_NO_PSK 1383238405Sjkim if (type & SSL_kPSK) 1384238405Sjkim { 1385238405Sjkim /* copy PSK identity hint */ 1386238405Sjkim s2n(strlen(s->ctx->psk_identity_hint), p); 1387238405Sjkim strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint)); 1388238405Sjkim p+=strlen(s->ctx->psk_identity_hint); 1389238405Sjkim } 1390238405Sjkim#endif 1391238405Sjkim 1392160814Ssimon /* not anonymous */ 1393160814Ssimon if (pkey != NULL) 1394160814Ssimon { 1395160814Ssimon /* n is the length of the params, they start at 1396160814Ssimon * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space 1397160814Ssimon * at the end. */ 1398160814Ssimon#ifndef OPENSSL_NO_RSA 1399160814Ssimon if (pkey->type == EVP_PKEY_RSA) 1400160814Ssimon { 1401160814Ssimon q=md_buf; 1402160814Ssimon j=0; 1403160814Ssimon for (num=2; num > 0; num--) 1404160814Ssimon { 1405160814Ssimon EVP_DigestInit_ex(&md_ctx,(num == 2) 1406160814Ssimon ?s->ctx->md5:s->ctx->sha1, NULL); 1407160814Ssimon EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1408160814Ssimon EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1409160814Ssimon EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1410160814Ssimon EVP_DigestFinal_ex(&md_ctx,q, 1411160814Ssimon (unsigned int *)&i); 1412160814Ssimon q+=i; 1413160814Ssimon j+=i; 1414160814Ssimon } 1415160814Ssimon if (RSA_sign(NID_md5_sha1, md_buf, j, 1416160814Ssimon &(p[2]), &u, pkey->pkey.rsa) <= 0) 1417160814Ssimon { 1418160814Ssimon SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA); 1419160814Ssimon goto err; 1420160814Ssimon } 1421160814Ssimon s2n(u,p); 1422160814Ssimon n+=u+2; 1423160814Ssimon } 1424160814Ssimon else 1425160814Ssimon#endif 1426160814Ssimon#if !defined(OPENSSL_NO_DSA) 1427160814Ssimon if (pkey->type == EVP_PKEY_DSA) 1428160814Ssimon { 1429160814Ssimon /* lets do DSS */ 1430160814Ssimon EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL); 1431160814Ssimon EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1432160814Ssimon EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1433160814Ssimon EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1434160814Ssimon if (!EVP_SignFinal(&md_ctx,&(p[2]), 1435160814Ssimon (unsigned int *)&i,pkey)) 1436160814Ssimon { 1437160814Ssimon SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA); 1438160814Ssimon goto err; 1439160814Ssimon } 1440160814Ssimon s2n(i,p); 1441160814Ssimon n+=i+2; 1442160814Ssimon } 1443160814Ssimon else 1444160814Ssimon#endif 1445238405Sjkim#if !defined(OPENSSL_NO_ECDSA) 1446238405Sjkim if (pkey->type == EVP_PKEY_EC) 1447160814Ssimon { 1448238405Sjkim /* let's do ECDSA */ 1449238405Sjkim EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL); 1450238405Sjkim EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1451238405Sjkim EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1452238405Sjkim EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1453238405Sjkim if (!EVP_SignFinal(&md_ctx,&(p[2]), 1454238405Sjkim (unsigned int *)&i,pkey)) 1455238405Sjkim { 1456238405Sjkim SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA); 1457238405Sjkim goto err; 1458238405Sjkim } 1459238405Sjkim s2n(i,p); 1460238405Sjkim n+=i+2; 1461238405Sjkim } 1462238405Sjkim else 1463238405Sjkim#endif 1464238405Sjkim { 1465160814Ssimon /* Is this error check actually needed? */ 1466160814Ssimon al=SSL_AD_HANDSHAKE_FAILURE; 1467160814Ssimon SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE); 1468160814Ssimon goto f_err; 1469160814Ssimon } 1470160814Ssimon } 1471160814Ssimon 1472160814Ssimon d = dtls1_set_message_header(s, d, 1473160814Ssimon SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n); 1474160814Ssimon 1475160814Ssimon /* we should now have things packed up, so lets send 1476160814Ssimon * it off */ 1477160814Ssimon s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1478160814Ssimon s->init_off=0; 1479160814Ssimon 1480160814Ssimon /* buffer the message to handle re-xmits */ 1481160814Ssimon dtls1_buffer_message(s, 0); 1482160814Ssimon } 1483160814Ssimon 1484160814Ssimon s->state = SSL3_ST_SW_KEY_EXCH_B; 1485160814Ssimon EVP_MD_CTX_cleanup(&md_ctx); 1486160814Ssimon return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1487160814Ssimonf_err: 1488160814Ssimon ssl3_send_alert(s,SSL3_AL_FATAL,al); 1489160814Ssimonerr: 1490238405Sjkim#ifndef OPENSSL_NO_ECDH 1491238405Sjkim if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1492238405Sjkim BN_CTX_free(bn_ctx); 1493238405Sjkim#endif 1494160814Ssimon EVP_MD_CTX_cleanup(&md_ctx); 1495160814Ssimon return(-1); 1496160814Ssimon } 1497160814Ssimon 1498160814Ssimonint dtls1_send_certificate_request(SSL *s) 1499160814Ssimon { 1500160814Ssimon unsigned char *p,*d; 1501160814Ssimon int i,j,nl,off,n; 1502160814Ssimon STACK_OF(X509_NAME) *sk=NULL; 1503160814Ssimon X509_NAME *name; 1504160814Ssimon BUF_MEM *buf; 1505194206Ssimon unsigned int msg_len; 1506160814Ssimon 1507160814Ssimon if (s->state == SSL3_ST_SW_CERT_REQ_A) 1508160814Ssimon { 1509160814Ssimon buf=s->init_buf; 1510160814Ssimon 1511160814Ssimon d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); 1512160814Ssimon 1513160814Ssimon /* get the list of acceptable cert types */ 1514160814Ssimon p++; 1515160814Ssimon n=ssl3_get_req_cert_type(s,p); 1516160814Ssimon d[0]=n; 1517160814Ssimon p+=n; 1518160814Ssimon n++; 1519160814Ssimon 1520160814Ssimon off=n; 1521160814Ssimon p+=2; 1522160814Ssimon n+=2; 1523160814Ssimon 1524160814Ssimon sk=SSL_get_client_CA_list(s); 1525160814Ssimon nl=0; 1526160814Ssimon if (sk != NULL) 1527160814Ssimon { 1528160814Ssimon for (i=0; i<sk_X509_NAME_num(sk); i++) 1529160814Ssimon { 1530160814Ssimon name=sk_X509_NAME_value(sk,i); 1531160814Ssimon j=i2d_X509_NAME(name,NULL); 1532160814Ssimon if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2)) 1533160814Ssimon { 1534160814Ssimon SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB); 1535160814Ssimon goto err; 1536160814Ssimon } 1537160814Ssimon p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]); 1538160814Ssimon if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) 1539160814Ssimon { 1540160814Ssimon s2n(j,p); 1541160814Ssimon i2d_X509_NAME(name,&p); 1542160814Ssimon n+=2+j; 1543160814Ssimon nl+=2+j; 1544160814Ssimon } 1545160814Ssimon else 1546160814Ssimon { 1547160814Ssimon d=p; 1548160814Ssimon i2d_X509_NAME(name,&p); 1549160814Ssimon j-=2; s2n(j,d); j+=2; 1550160814Ssimon n+=j; 1551160814Ssimon nl+=j; 1552160814Ssimon } 1553160814Ssimon } 1554160814Ssimon } 1555160814Ssimon /* else no CA names */ 1556160814Ssimon p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]); 1557160814Ssimon s2n(nl,p); 1558160814Ssimon 1559160814Ssimon d=(unsigned char *)buf->data; 1560160814Ssimon *(d++)=SSL3_MT_CERTIFICATE_REQUEST; 1561160814Ssimon l2n3(n,d); 1562160814Ssimon s2n(s->d1->handshake_write_seq,d); 1563160814Ssimon s->d1->handshake_write_seq++; 1564160814Ssimon 1565160814Ssimon /* we should now have things packed up, so lets send 1566160814Ssimon * it off */ 1567160814Ssimon 1568160814Ssimon s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1569160814Ssimon s->init_off=0; 1570160814Ssimon#ifdef NETSCAPE_HANG_BUG 1571160814Ssimon/* XXX: what to do about this? */ 1572160814Ssimon p=(unsigned char *)s->init_buf->data + s->init_num; 1573160814Ssimon 1574160814Ssimon /* do the header */ 1575160814Ssimon *(p++)=SSL3_MT_SERVER_DONE; 1576160814Ssimon *(p++)=0; 1577160814Ssimon *(p++)=0; 1578160814Ssimon *(p++)=0; 1579160814Ssimon s->init_num += 4; 1580160814Ssimon#endif 1581160814Ssimon 1582160814Ssimon /* XDTLS: set message header ? */ 1583194206Ssimon msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1584194206Ssimon dtls1_set_message_header(s, (void *)s->init_buf->data, 1585194206Ssimon SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len); 1586194206Ssimon 1587160814Ssimon /* buffer the message to handle re-xmits */ 1588160814Ssimon dtls1_buffer_message(s, 0); 1589160814Ssimon 1590160814Ssimon s->state = SSL3_ST_SW_CERT_REQ_B; 1591160814Ssimon } 1592160814Ssimon 1593160814Ssimon /* SSL3_ST_SW_CERT_REQ_B */ 1594160814Ssimon return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1595160814Ssimonerr: 1596160814Ssimon return(-1); 1597160814Ssimon } 1598160814Ssimon 1599160814Ssimonint dtls1_send_server_certificate(SSL *s) 1600160814Ssimon { 1601160814Ssimon unsigned long l; 1602160814Ssimon X509 *x; 1603160814Ssimon 1604160814Ssimon if (s->state == SSL3_ST_SW_CERT_A) 1605160814Ssimon { 1606160814Ssimon x=ssl_get_server_send_cert(s); 1607238405Sjkim if (x == NULL) 1608160814Ssimon { 1609238405Sjkim /* VRS: allow null cert if auth == KRB5 */ 1610238405Sjkim if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) || 1611238405Sjkim (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5)) 1612238405Sjkim { 1613238405Sjkim SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR); 1614238405Sjkim return(0); 1615238405Sjkim } 1616160814Ssimon } 1617160814Ssimon 1618160814Ssimon l=dtls1_output_cert_chain(s,x); 1619279264Sdelphij if (!l) 1620279264Sdelphij { 1621279264Sdelphij SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR); 1622279264Sdelphij return(0); 1623279264Sdelphij } 1624160814Ssimon s->state=SSL3_ST_SW_CERT_B; 1625160814Ssimon s->init_num=(int)l; 1626160814Ssimon s->init_off=0; 1627160814Ssimon 1628160814Ssimon /* buffer the message to handle re-xmits */ 1629160814Ssimon dtls1_buffer_message(s, 0); 1630160814Ssimon } 1631160814Ssimon 1632160814Ssimon /* SSL3_ST_SW_CERT_B */ 1633160814Ssimon return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1634160814Ssimon } 1635205128Ssimon 1636205128Ssimon#ifndef OPENSSL_NO_TLSEXT 1637205128Ssimonint dtls1_send_newsession_ticket(SSL *s) 1638205128Ssimon { 1639205128Ssimon if (s->state == SSL3_ST_SW_SESSION_TICKET_A) 1640205128Ssimon { 1641205128Ssimon unsigned char *p, *senc, *macstart; 1642205128Ssimon int len, slen; 1643205128Ssimon unsigned int hlen, msg_len; 1644205128Ssimon EVP_CIPHER_CTX ctx; 1645205128Ssimon HMAC_CTX hctx; 1646205128Ssimon SSL_CTX *tctx = s->initial_ctx; 1647205128Ssimon unsigned char iv[EVP_MAX_IV_LENGTH]; 1648205128Ssimon unsigned char key_name[16]; 1649205128Ssimon 1650205128Ssimon /* get session encoding length */ 1651205128Ssimon slen = i2d_SSL_SESSION(s->session, NULL); 1652205128Ssimon /* Some length values are 16 bits, so forget it if session is 1653205128Ssimon * too long 1654205128Ssimon */ 1655205128Ssimon if (slen > 0xFF00) 1656205128Ssimon return -1; 1657205128Ssimon /* Grow buffer if need be: the length calculation is as 1658205128Ssimon * follows 12 (DTLS handshake message header) + 1659205128Ssimon * 4 (ticket lifetime hint) + 2 (ticket length) + 1660205128Ssimon * 16 (key name) + max_iv_len (iv length) + 1661205128Ssimon * session_length + max_enc_block_size (max encrypted session 1662205128Ssimon * length) + max_md_size (HMAC). 1663205128Ssimon */ 1664205128Ssimon if (!BUF_MEM_grow(s->init_buf, 1665205128Ssimon DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH + 1666205128Ssimon EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) 1667205128Ssimon return -1; 1668205128Ssimon senc = OPENSSL_malloc(slen); 1669205128Ssimon if (!senc) 1670205128Ssimon return -1; 1671205128Ssimon p = senc; 1672205128Ssimon i2d_SSL_SESSION(s->session, &p); 1673205128Ssimon 1674205128Ssimon p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]); 1675205128Ssimon EVP_CIPHER_CTX_init(&ctx); 1676205128Ssimon HMAC_CTX_init(&hctx); 1677205128Ssimon /* Initialize HMAC and cipher contexts. If callback present 1678205128Ssimon * it does all the work otherwise use generated values 1679205128Ssimon * from parent ctx. 1680205128Ssimon */ 1681205128Ssimon if (tctx->tlsext_ticket_key_cb) 1682205128Ssimon { 1683205128Ssimon if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, 1684205128Ssimon &hctx, 1) < 0) 1685205128Ssimon { 1686205128Ssimon OPENSSL_free(senc); 1687205128Ssimon return -1; 1688205128Ssimon } 1689205128Ssimon } 1690205128Ssimon else 1691205128Ssimon { 1692205128Ssimon RAND_pseudo_bytes(iv, 16); 1693205128Ssimon EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 1694205128Ssimon tctx->tlsext_tick_aes_key, iv); 1695205128Ssimon HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, 1696205128Ssimon tlsext_tick_md(), NULL); 1697205128Ssimon memcpy(key_name, tctx->tlsext_tick_key_name, 16); 1698205128Ssimon } 1699205128Ssimon l2n(s->session->tlsext_tick_lifetime_hint, p); 1700205128Ssimon /* Skip ticket length for now */ 1701205128Ssimon p += 2; 1702205128Ssimon /* Output key name */ 1703205128Ssimon macstart = p; 1704205128Ssimon memcpy(p, key_name, 16); 1705205128Ssimon p += 16; 1706205128Ssimon /* output IV */ 1707205128Ssimon memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx)); 1708205128Ssimon p += EVP_CIPHER_CTX_iv_length(&ctx); 1709205128Ssimon /* Encrypt session data */ 1710205128Ssimon EVP_EncryptUpdate(&ctx, p, &len, senc, slen); 1711205128Ssimon p += len; 1712205128Ssimon EVP_EncryptFinal(&ctx, p, &len); 1713205128Ssimon p += len; 1714205128Ssimon EVP_CIPHER_CTX_cleanup(&ctx); 1715205128Ssimon 1716205128Ssimon HMAC_Update(&hctx, macstart, p - macstart); 1717205128Ssimon HMAC_Final(&hctx, p, &hlen); 1718205128Ssimon HMAC_CTX_cleanup(&hctx); 1719205128Ssimon 1720205128Ssimon p += hlen; 1721205128Ssimon /* Now write out lengths: p points to end of data written */ 1722205128Ssimon /* Total length */ 1723205128Ssimon len = p - (unsigned char *)(s->init_buf->data); 1724205128Ssimon /* Ticket length */ 1725205128Ssimon p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4; 1726205128Ssimon s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p); 1727205128Ssimon 1728205128Ssimon /* number of bytes to write */ 1729205128Ssimon s->init_num= len; 1730205128Ssimon s->state=SSL3_ST_SW_SESSION_TICKET_B; 1731205128Ssimon s->init_off=0; 1732205128Ssimon OPENSSL_free(senc); 1733205128Ssimon 1734205128Ssimon /* XDTLS: set message header ? */ 1735205128Ssimon msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1736205128Ssimon dtls1_set_message_header(s, (void *)s->init_buf->data, 1737205128Ssimon SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len); 1738205128Ssimon 1739205128Ssimon /* buffer the message to handle re-xmits */ 1740205128Ssimon dtls1_buffer_message(s, 0); 1741205128Ssimon } 1742205128Ssimon 1743205128Ssimon /* SSL3_ST_SW_SESSION_TICKET_B */ 1744205128Ssimon return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1745205128Ssimon } 1746205128Ssimon#endif 1747