Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* ssl/s23_clnt.c */ |
| 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This package is an SSL implementation written |
| 6 | * by Eric Young (eay@cryptsoft.com). |
| 7 | * The implementation was written so as to conform with Netscapes SSL. |
| 8 | * |
| 9 | * This library is free for commercial and non-commercial use as long as |
| 10 | * the following conditions are aheared to. The following conditions |
| 11 | * apply to all code found in this distribution, be it the RC4, RSA, |
| 12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| 13 | * included with this distribution is covered by the same copyright terms |
| 14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| 15 | * |
| 16 | * Copyright remains Eric Young's, and as such any Copyright notices in |
| 17 | * the code are not to be removed. |
| 18 | * If this package is used in a product, Eric Young should be given attribution |
| 19 | * as the author of the parts of the library used. |
| 20 | * This can be in the form of a textual message at program startup or |
| 21 | * in documentation (online or textual) provided with the package. |
| 22 | * |
| 23 | * Redistribution and use in source and binary forms, with or without |
| 24 | * modification, are permitted provided that the following conditions |
| 25 | * are met: |
| 26 | * 1. Redistributions of source code must retain the copyright |
| 27 | * notice, this list of conditions and the following disclaimer. |
| 28 | * 2. Redistributions in binary form must reproduce the above copyright |
| 29 | * notice, this list of conditions and the following disclaimer in the |
| 30 | * documentation and/or other materials provided with the distribution. |
| 31 | * 3. All advertising materials mentioning features or use of this software |
| 32 | * must display the following acknowledgement: |
| 33 | * "This product includes cryptographic software written by |
| 34 | * Eric Young (eay@cryptsoft.com)" |
| 35 | * The word 'cryptographic' can be left out if the rouines from the library |
| 36 | * being used are not cryptographic related :-). |
| 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
| 38 | * the apps directory (application code) you must include an acknowledgement: |
| 39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| 40 | * |
| 41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| 42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 51 | * SUCH DAMAGE. |
| 52 | * |
| 53 | * The licence and distribution terms for any publically available version or |
| 54 | * derivative of this code cannot be changed. i.e. this code cannot simply be |
| 55 | * copied and put under another distribution licence |
| 56 | * [including the GNU Public Licence.] |
| 57 | */ |
| 58 | /* ==================================================================== |
| 59 | * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved. |
| 60 | * |
| 61 | * Redistribution and use in source and binary forms, with or without |
| 62 | * modification, are permitted provided that the following conditions |
| 63 | * are met: |
| 64 | * |
| 65 | * 1. Redistributions of source code must retain the above copyright |
| 66 | * notice, this list of conditions and the following disclaimer. |
| 67 | * |
| 68 | * 2. Redistributions in binary form must reproduce the above copyright |
| 69 | * notice, this list of conditions and the following disclaimer in |
| 70 | * the documentation and/or other materials provided with the |
| 71 | * distribution. |
| 72 | * |
| 73 | * 3. All advertising materials mentioning features or use of this |
| 74 | * software must display the following acknowledgment: |
| 75 | * "This product includes software developed by the OpenSSL Project |
| 76 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" |
| 77 | * |
| 78 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| 79 | * endorse or promote products derived from this software without |
| 80 | * prior written permission. For written permission, please contact |
| 81 | * openssl-core@openssl.org. |
| 82 | * |
| 83 | * 5. Products derived from this software may not be called "OpenSSL" |
| 84 | * nor may "OpenSSL" appear in their names without prior written |
| 85 | * permission of the OpenSSL Project. |
| 86 | * |
| 87 | * 6. Redistributions of any form whatsoever must retain the following |
| 88 | * acknowledgment: |
| 89 | * "This product includes software developed by the OpenSSL Project |
| 90 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" |
| 91 | * |
| 92 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| 93 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 94 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 95 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| 96 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 97 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 98 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 99 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 100 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 101 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 102 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 103 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 104 | * ==================================================================== |
| 105 | * |
| 106 | * This product includes cryptographic software written by Eric Young |
| 107 | * (eay@cryptsoft.com). This product includes software written by Tim |
| 108 | * Hudson (tjh@cryptsoft.com). |
| 109 | * |
| 110 | */ |
| 111 | |
| 112 | #include <stdio.h> |
| 113 | #include "ssl_locl.h" |
| 114 | #include <openssl/buffer.h> |
| 115 | #include <openssl/rand.h> |
| 116 | #include <openssl/objects.h> |
| 117 | #include <openssl/evp.h> |
| 118 | |
| 119 | static const SSL_METHOD *ssl23_get_client_method(int ver); |
| 120 | static int ssl23_client_hello(SSL *s); |
| 121 | static int ssl23_get_server_hello(SSL *s); |
| 122 | static const SSL_METHOD *ssl23_get_client_method(int ver) |
| 123 | { |
| 124 | #ifndef OPENSSL_NO_SSL2 |
| 125 | if (ver == SSL2_VERSION) |
| 126 | return(SSLv2_client_method()); |
| 127 | #endif |
| 128 | if (ver == SSL3_VERSION) |
| 129 | return(SSLv3_client_method()); |
| 130 | else if (ver == TLS1_VERSION) |
| 131 | return(TLSv1_client_method()); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 132 | else |
| 133 | return(NULL); |
| 134 | } |
| 135 | |
| 136 | IMPLEMENT_ssl23_meth_func(SSLv23_client_method, |
| 137 | ssl_undefined_function, |
| 138 | ssl23_connect, |
| 139 | ssl23_get_client_method) |
| 140 | |
| 141 | int ssl23_connect(SSL *s) |
| 142 | { |
| 143 | BUF_MEM *buf=NULL; |
| 144 | unsigned long Time=(unsigned long)time(NULL); |
| 145 | void (*cb)(const SSL *ssl,int type,int val)=NULL; |
| 146 | int ret= -1; |
| 147 | int new_state,state; |
| 148 | |
| 149 | RAND_add(&Time,sizeof(Time),0); |
| 150 | ERR_clear_error(); |
| 151 | clear_sys_error(); |
| 152 | |
| 153 | if (s->info_callback != NULL) |
| 154 | cb=s->info_callback; |
| 155 | else if (s->ctx->info_callback != NULL) |
| 156 | cb=s->ctx->info_callback; |
| 157 | |
| 158 | s->in_handshake++; |
| 159 | if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); |
| 160 | |
| 161 | for (;;) |
| 162 | { |
| 163 | state=s->state; |
| 164 | |
| 165 | switch(s->state) |
| 166 | { |
| 167 | case SSL_ST_BEFORE: |
| 168 | case SSL_ST_CONNECT: |
| 169 | case SSL_ST_BEFORE|SSL_ST_CONNECT: |
| 170 | case SSL_ST_OK|SSL_ST_CONNECT: |
| 171 | |
| 172 | if (s->session != NULL) |
| 173 | { |
| 174 | SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE); |
| 175 | ret= -1; |
| 176 | goto end; |
| 177 | } |
| 178 | s->server=0; |
| 179 | if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); |
| 180 | |
| 181 | /* s->version=TLS1_VERSION; */ |
| 182 | s->type=SSL_ST_CONNECT; |
| 183 | |
| 184 | if (s->init_buf == NULL) |
| 185 | { |
| 186 | if ((buf=BUF_MEM_new()) == NULL) |
| 187 | { |
| 188 | ret= -1; |
| 189 | goto end; |
| 190 | } |
| 191 | if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) |
| 192 | { |
| 193 | ret= -1; |
| 194 | goto end; |
| 195 | } |
| 196 | s->init_buf=buf; |
| 197 | buf=NULL; |
| 198 | } |
| 199 | |
| 200 | if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } |
| 201 | |
| 202 | ssl3_init_finished_mac(s); |
| 203 | |
| 204 | s->state=SSL23_ST_CW_CLNT_HELLO_A; |
| 205 | s->ctx->stats.sess_connect++; |
| 206 | s->init_num=0; |
| 207 | break; |
| 208 | |
| 209 | case SSL23_ST_CW_CLNT_HELLO_A: |
| 210 | case SSL23_ST_CW_CLNT_HELLO_B: |
| 211 | |
| 212 | s->shutdown=0; |
| 213 | ret=ssl23_client_hello(s); |
| 214 | if (ret <= 0) goto end; |
| 215 | s->state=SSL23_ST_CR_SRVR_HELLO_A; |
| 216 | s->init_num=0; |
| 217 | |
| 218 | break; |
| 219 | |
| 220 | case SSL23_ST_CR_SRVR_HELLO_A: |
| 221 | case SSL23_ST_CR_SRVR_HELLO_B: |
| 222 | ret=ssl23_get_server_hello(s); |
| 223 | if (ret >= 0) cb=NULL; |
| 224 | goto end; |
| 225 | /* break; */ |
| 226 | |
| 227 | default: |
| 228 | SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE); |
| 229 | ret= -1; |
| 230 | goto end; |
| 231 | /* break; */ |
| 232 | } |
| 233 | |
| 234 | if (s->debug) { (void)BIO_flush(s->wbio); } |
| 235 | |
| 236 | if ((cb != NULL) && (s->state != state)) |
| 237 | { |
| 238 | new_state=s->state; |
| 239 | s->state=state; |
| 240 | cb(s,SSL_CB_CONNECT_LOOP,1); |
| 241 | s->state=new_state; |
| 242 | } |
| 243 | } |
| 244 | end: |
| 245 | s->in_handshake--; |
| 246 | if (buf != NULL) |
| 247 | BUF_MEM_free(buf); |
| 248 | if (cb != NULL) |
| 249 | cb(s,SSL_CB_CONNECT_EXIT,ret); |
| 250 | return(ret); |
| 251 | } |
| 252 | |
| 253 | static int ssl23_no_ssl2_ciphers(SSL *s) |
| 254 | { |
| 255 | SSL_CIPHER *cipher; |
| 256 | STACK_OF(SSL_CIPHER) *ciphers; |
| 257 | int i; |
| 258 | ciphers = SSL_get_ciphers(s); |
| 259 | for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) |
| 260 | { |
| 261 | cipher = sk_SSL_CIPHER_value(ciphers, i); |
| 262 | if (cipher->algorithm_ssl == SSL_SSLV2) |
| 263 | return 0; |
| 264 | } |
| 265 | return 1; |
| 266 | } |
| 267 | |
| 268 | static int ssl23_client_hello(SSL *s) |
| 269 | { |
| 270 | unsigned char *buf; |
| 271 | unsigned char *p,*d; |
| 272 | int i,ch_len; |
| 273 | unsigned long Time,l; |
| 274 | int ssl2_compat; |
| 275 | int version = 0, version_major, version_minor; |
| 276 | #ifndef OPENSSL_NO_COMP |
| 277 | int j; |
| 278 | SSL_COMP *comp; |
| 279 | #endif |
| 280 | int ret; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 281 | |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 282 | ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 283 | |
| 284 | if (ssl2_compat && ssl23_no_ssl2_ciphers(s)) |
| 285 | ssl2_compat = 0; |
| 286 | |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 287 | if (!(s->options & SSL_OP_NO_TLSv1)) |
| 288 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 289 | version = TLS1_VERSION; |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 290 | } |
| 291 | else if (!(s->options & SSL_OP_NO_SSLv3)) |
| 292 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 293 | version = SSL3_VERSION; |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 294 | } |
| 295 | else if (!(s->options & SSL_OP_NO_SSLv2)) |
| 296 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 297 | version = SSL2_VERSION; |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 298 | } |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 299 | #ifndef OPENSSL_NO_TLSEXT |
| 300 | if (version != SSL2_VERSION) |
| 301 | { |
| 302 | /* have to disable SSL 2.0 compatibility if we need TLS extensions */ |
| 303 | |
| 304 | if (s->tlsext_hostname != NULL) |
| 305 | ssl2_compat = 0; |
| 306 | if (s->tlsext_status_type != -1) |
| 307 | ssl2_compat = 0; |
| 308 | #ifdef TLSEXT_TYPE_opaque_prf_input |
| 309 | if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL) |
| 310 | ssl2_compat = 0; |
| 311 | #endif |
| 312 | } |
| 313 | #endif |
| 314 | |
| 315 | buf=(unsigned char *)s->init_buf->data; |
| 316 | if (s->state == SSL23_ST_CW_CLNT_HELLO_A) |
| 317 | { |
| 318 | #if 0 |
| 319 | /* don't reuse session-id's */ |
| 320 | if (!ssl_get_new_session(s,0)) |
| 321 | { |
| 322 | return(-1); |
| 323 | } |
| 324 | #endif |
| 325 | |
| 326 | p=s->s3->client_random; |
| 327 | Time=(unsigned long)time(NULL); /* Time */ |
| 328 | l2n(Time,p); |
| 329 | if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0) |
| 330 | return -1; |
| 331 | |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 332 | if (version == TLS1_VERSION) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 333 | { |
| 334 | version_major = TLS1_VERSION_MAJOR; |
| 335 | version_minor = TLS1_VERSION_MINOR; |
| 336 | } |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 337 | else if (version == SSL3_VERSION) |
| 338 | { |
| 339 | version_major = SSL3_VERSION_MAJOR; |
| 340 | version_minor = SSL3_VERSION_MINOR; |
| 341 | } |
| 342 | else if (version == SSL2_VERSION) |
| 343 | { |
| 344 | version_major = SSL2_VERSION_MAJOR; |
| 345 | version_minor = SSL2_VERSION_MINOR; |
| 346 | } |
| 347 | else |
| 348 | { |
| 349 | SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE); |
| 350 | return(-1); |
| 351 | } |
| 352 | |
| 353 | s->client_version = version; |
| 354 | |
| 355 | if (ssl2_compat) |
| 356 | { |
| 357 | /* create SSL 2.0 compatible Client Hello */ |
| 358 | |
| 359 | /* two byte record header will be written last */ |
| 360 | d = &(buf[2]); |
| 361 | p = d + 9; /* leave space for message type, version, individual length fields */ |
| 362 | |
| 363 | *(d++) = SSL2_MT_CLIENT_HELLO; |
| 364 | *(d++) = version_major; |
| 365 | *(d++) = version_minor; |
| 366 | |
| 367 | /* Ciphers supported */ |
| 368 | i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0); |
| 369 | if (i == 0) |
| 370 | { |
| 371 | /* no ciphers */ |
| 372 | SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); |
| 373 | return -1; |
| 374 | } |
| 375 | s2n(i,d); |
| 376 | p+=i; |
| 377 | |
| 378 | /* put in the session-id length (zero since there is no reuse) */ |
| 379 | #if 0 |
| 380 | s->session->session_id_length=0; |
| 381 | #endif |
| 382 | s2n(0,d); |
| 383 | |
| 384 | if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) |
| 385 | ch_len=SSL2_CHALLENGE_LENGTH; |
| 386 | else |
| 387 | ch_len=SSL2_MAX_CHALLENGE_LENGTH; |
| 388 | |
| 389 | /* write out sslv2 challenge */ |
| 390 | /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), |
| 391 | because it is one of SSL2_MAX_CHALLENGE_LENGTH (32) |
| 392 | or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the |
| 393 | check in for futurproofing */ |
| 394 | if (SSL3_RANDOM_SIZE < ch_len) |
| 395 | i=SSL3_RANDOM_SIZE; |
| 396 | else |
| 397 | i=ch_len; |
| 398 | s2n(i,d); |
| 399 | memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE); |
| 400 | if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0) |
| 401 | return -1; |
| 402 | |
| 403 | memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); |
| 404 | p+=i; |
| 405 | |
| 406 | i= p- &(buf[2]); |
| 407 | buf[0]=((i>>8)&0xff)|0x80; |
| 408 | buf[1]=(i&0xff); |
| 409 | |
| 410 | /* number of bytes to write */ |
| 411 | s->init_num=i+2; |
| 412 | s->init_off=0; |
| 413 | |
| 414 | ssl3_finish_mac(s,&(buf[2]),i); |
| 415 | } |
| 416 | else |
| 417 | { |
| 418 | /* create Client Hello in SSL 3.0/TLS 1.0 format */ |
| 419 | |
| 420 | /* do the record header (5 bytes) and handshake message header (4 bytes) last */ |
| 421 | d = p = &(buf[9]); |
| 422 | |
| 423 | *(p++) = version_major; |
| 424 | *(p++) = version_minor; |
| 425 | |
| 426 | /* Random stuff */ |
| 427 | memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); |
| 428 | p += SSL3_RANDOM_SIZE; |
| 429 | |
| 430 | /* Session ID (zero since there is no reuse) */ |
| 431 | *(p++) = 0; |
| 432 | |
| 433 | /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */ |
| 434 | i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char); |
| 435 | if (i == 0) |
| 436 | { |
| 437 | SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); |
| 438 | return -1; |
| 439 | } |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 440 | s2n(i,p); |
| 441 | p+=i; |
| 442 | |
| 443 | /* COMPRESSION */ |
| 444 | #ifdef OPENSSL_NO_COMP |
| 445 | *(p++)=1; |
| 446 | #else |
| 447 | if ((s->options & SSL_OP_NO_COMPRESSION) |
| 448 | || !s->ctx->comp_methods) |
| 449 | j=0; |
| 450 | else |
| 451 | j=sk_SSL_COMP_num(s->ctx->comp_methods); |
| 452 | *(p++)=1+j; |
| 453 | for (i=0; i<j; i++) |
| 454 | { |
| 455 | comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); |
| 456 | *(p++)=comp->id; |
| 457 | } |
| 458 | #endif |
| 459 | *(p++)=0; /* Add the NULL method */ |
| 460 | |
| 461 | #ifndef OPENSSL_NO_TLSEXT |
| 462 | /* TLS extensions*/ |
| 463 | if (ssl_prepare_clienthello_tlsext(s) <= 0) |
| 464 | { |
| 465 | SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT); |
| 466 | return -1; |
| 467 | } |
| 468 | if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) |
| 469 | { |
| 470 | SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); |
| 471 | return -1; |
| 472 | } |
| 473 | #endif |
| 474 | |
| 475 | l = p-d; |
| 476 | |
| 477 | /* fill in 4-byte handshake header */ |
| 478 | d=&(buf[5]); |
| 479 | *(d++)=SSL3_MT_CLIENT_HELLO; |
| 480 | l2n3(l,d); |
| 481 | |
| 482 | l += 4; |
| 483 | |
| 484 | if (l > SSL3_RT_MAX_PLAIN_LENGTH) |
| 485 | { |
| 486 | SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); |
| 487 | return -1; |
| 488 | } |
| 489 | |
| 490 | /* fill in 5-byte record header */ |
| 491 | d=buf; |
| 492 | *(d++) = SSL3_RT_HANDSHAKE; |
| 493 | *(d++) = version_major; |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 494 | *(d++) = version_minor; /* arguably we should send the *lowest* suported version here |
| 495 | * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */ |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 496 | s2n((int)l,d); |
| 497 | |
| 498 | /* number of bytes to write */ |
| 499 | s->init_num=p-buf; |
| 500 | s->init_off=0; |
| 501 | |
| 502 | ssl3_finish_mac(s,&(buf[5]), s->init_num - 5); |
| 503 | } |
| 504 | |
| 505 | s->state=SSL23_ST_CW_CLNT_HELLO_B; |
| 506 | s->init_off=0; |
| 507 | } |
| 508 | |
| 509 | /* SSL3_ST_CW_CLNT_HELLO_B */ |
| 510 | ret = ssl23_write_bytes(s); |
| 511 | |
| 512 | if ((ret >= 2) && s->msg_callback) |
| 513 | { |
| 514 | /* Client Hello has been sent; tell msg_callback */ |
| 515 | |
| 516 | if (ssl2_compat) |
| 517 | s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); |
| 518 | else |
| 519 | s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg); |
| 520 | } |
| 521 | |
| 522 | return ret; |
| 523 | } |
| 524 | |
| 525 | static int ssl23_get_server_hello(SSL *s) |
| 526 | { |
| 527 | char buf[8]; |
| 528 | unsigned char *p; |
| 529 | int i; |
| 530 | int n; |
| 531 | |
| 532 | n=ssl23_read_bytes(s,7); |
| 533 | |
| 534 | if (n != 7) return(n); |
| 535 | p=s->packet; |
| 536 | |
| 537 | memcpy(buf,p,n); |
| 538 | |
| 539 | if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && |
| 540 | (p[5] == 0x00) && (p[6] == 0x02)) |
| 541 | { |
| 542 | #ifdef OPENSSL_NO_SSL2 |
| 543 | SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); |
| 544 | goto err; |
| 545 | #else |
| 546 | /* we are talking sslv2 */ |
| 547 | /* we need to clean up the SSLv3 setup and put in the |
| 548 | * sslv2 stuff. */ |
| 549 | int ch_len; |
| 550 | |
| 551 | if (s->options & SSL_OP_NO_SSLv2) |
| 552 | { |
| 553 | SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); |
| 554 | goto err; |
| 555 | } |
| 556 | if (s->s2 == NULL) |
| 557 | { |
| 558 | if (!ssl2_new(s)) |
| 559 | goto err; |
| 560 | } |
| 561 | else |
| 562 | ssl2_clear(s); |
| 563 | |
| 564 | if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) |
| 565 | ch_len=SSL2_CHALLENGE_LENGTH; |
| 566 | else |
| 567 | ch_len=SSL2_MAX_CHALLENGE_LENGTH; |
| 568 | |
| 569 | /* write out sslv2 challenge */ |
| 570 | /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because |
| 571 | it is one of SSL2_MAX_CHALLENGE_LENGTH (32) or |
| 572 | SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for |
| 573 | futurproofing */ |
| 574 | i=(SSL3_RANDOM_SIZE < ch_len) |
| 575 | ?SSL3_RANDOM_SIZE:ch_len; |
| 576 | s->s2->challenge_length=i; |
| 577 | memcpy(s->s2->challenge, |
| 578 | &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); |
| 579 | |
| 580 | if (s->s3 != NULL) ssl3_free(s); |
| 581 | |
| 582 | if (!BUF_MEM_grow_clean(s->init_buf, |
| 583 | SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) |
| 584 | { |
| 585 | SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB); |
| 586 | goto err; |
| 587 | } |
| 588 | |
| 589 | s->state=SSL2_ST_GET_SERVER_HELLO_A; |
| 590 | if (!(s->client_version == SSL2_VERSION)) |
| 591 | /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */ |
| 592 | s->s2->ssl2_rollback=1; |
| 593 | |
| 594 | /* setup the 7 bytes we have read so we get them from |
| 595 | * the sslv2 buffer */ |
| 596 | s->rstate=SSL_ST_READ_HEADER; |
| 597 | s->packet_length=n; |
| 598 | s->packet= &(s->s2->rbuf[0]); |
| 599 | memcpy(s->packet,buf,n); |
| 600 | s->s2->rbuf_left=n; |
| 601 | s->s2->rbuf_offs=0; |
| 602 | |
| 603 | /* we have already written one */ |
| 604 | s->s2->write_sequence=1; |
| 605 | |
| 606 | s->method=SSLv2_client_method(); |
| 607 | s->handshake_func=s->method->ssl_connect; |
| 608 | #endif |
| 609 | } |
| 610 | else if (p[1] == SSL3_VERSION_MAJOR && |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 611 | (p[2] == SSL3_VERSION_MINOR || p[2] == TLS1_VERSION_MINOR) && |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 612 | ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) || |
| 613 | (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) |
| 614 | { |
| 615 | /* we have sslv3 or tls1 (server hello or alert) */ |
| 616 | |
| 617 | if ((p[2] == SSL3_VERSION_MINOR) && |
| 618 | !(s->options & SSL_OP_NO_SSLv3)) |
| 619 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 620 | s->version=SSL3_VERSION; |
| 621 | s->method=SSLv3_client_method(); |
| 622 | } |
| 623 | else if ((p[2] == TLS1_VERSION_MINOR) && |
| 624 | !(s->options & SSL_OP_NO_TLSv1)) |
| 625 | { |
| 626 | s->version=TLS1_VERSION; |
| 627 | s->method=TLSv1_client_method(); |
| 628 | } |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 629 | else |
| 630 | { |
| 631 | SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); |
| 632 | goto err; |
| 633 | } |
| 634 | |
| 635 | if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) |
| 636 | { |
| 637 | /* fatal alert */ |
| 638 | |
| 639 | void (*cb)(const SSL *ssl,int type,int val)=NULL; |
| 640 | int j; |
| 641 | |
| 642 | if (s->info_callback != NULL) |
| 643 | cb=s->info_callback; |
| 644 | else if (s->ctx->info_callback != NULL) |
| 645 | cb=s->ctx->info_callback; |
| 646 | |
| 647 | i=p[5]; |
| 648 | if (cb != NULL) |
| 649 | { |
| 650 | j=(i<<8)|p[6]; |
| 651 | cb(s,SSL_CB_READ_ALERT,j); |
| 652 | } |
| 653 | |
| 654 | if (s->msg_callback) |
| 655 | s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg); |
| 656 | |
| 657 | s->rwstate=SSL_NOTHING; |
| 658 | SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]); |
| 659 | goto err; |
| 660 | } |
| 661 | |
| 662 | if (!ssl_init_wbio_buffer(s,1)) goto err; |
| 663 | |
| 664 | /* we are in this state */ |
| 665 | s->state=SSL3_ST_CR_SRVR_HELLO_A; |
| 666 | |
| 667 | /* put the 7 bytes we have read into the input buffer |
| 668 | * for SSLv3 */ |
| 669 | s->rstate=SSL_ST_READ_HEADER; |
| 670 | s->packet_length=n; |
| 671 | if (s->s3->rbuf.buf == NULL) |
| 672 | if (!ssl3_setup_read_buffer(s)) |
| 673 | goto err; |
| 674 | s->packet= &(s->s3->rbuf.buf[0]); |
| 675 | memcpy(s->packet,buf,n); |
| 676 | s->s3->rbuf.left=n; |
| 677 | s->s3->rbuf.offset=0; |
| 678 | |
| 679 | s->handshake_func=s->method->ssl_connect; |
| 680 | } |
| 681 | else |
| 682 | { |
| 683 | SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL); |
| 684 | goto err; |
| 685 | } |
| 686 | s->init_num=0; |
| 687 | |
| 688 | /* Since, if we are sending a ssl23 client hello, we are not |
| 689 | * reusing a session-id */ |
| 690 | if (!s->session_creation_enabled) |
| 691 | { |
| 692 | if (!(s->client_version == SSL2_VERSION)) |
| 693 | ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); |
| 694 | SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_SESSION_MAY_NOT_BE_CREATED); |
| 695 | goto err; |
| 696 | } |
| 697 | if (!ssl_get_new_session(s,0)) |
| 698 | goto err; |
| 699 | |
| 700 | return(SSL_connect(s)); |
| 701 | err: |
| 702 | return(-1); |
| 703 | } |