Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* ssl/s23_srvr.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> |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 118 | |
| 119 | static const SSL_METHOD *ssl23_get_server_method(int ver); |
| 120 | int ssl23_get_client_hello(SSL *s); |
| 121 | static const SSL_METHOD *ssl23_get_server_method(int ver) |
| 122 | { |
| 123 | #ifndef OPENSSL_NO_SSL2 |
| 124 | if (ver == SSL2_VERSION) |
| 125 | return(SSLv2_server_method()); |
| 126 | #endif |
| 127 | if (ver == SSL3_VERSION) |
| 128 | return(SSLv3_server_method()); |
| 129 | else if (ver == TLS1_VERSION) |
| 130 | return(TLSv1_server_method()); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 131 | else |
| 132 | return(NULL); |
| 133 | } |
| 134 | |
| 135 | IMPLEMENT_ssl23_meth_func(SSLv23_server_method, |
| 136 | ssl23_accept, |
| 137 | ssl_undefined_function, |
| 138 | ssl23_get_server_method) |
| 139 | |
| 140 | int ssl23_accept(SSL *s) |
| 141 | { |
| 142 | BUF_MEM *buf; |
| 143 | unsigned long Time=(unsigned long)time(NULL); |
| 144 | void (*cb)(const SSL *ssl,int type,int val)=NULL; |
| 145 | int ret= -1; |
| 146 | int new_state,state; |
| 147 | |
| 148 | RAND_add(&Time,sizeof(Time),0); |
| 149 | ERR_clear_error(); |
| 150 | clear_sys_error(); |
| 151 | |
| 152 | if (s->info_callback != NULL) |
| 153 | cb=s->info_callback; |
| 154 | else if (s->ctx->info_callback != NULL) |
| 155 | cb=s->ctx->info_callback; |
| 156 | |
| 157 | s->in_handshake++; |
| 158 | if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); |
| 159 | |
| 160 | for (;;) |
| 161 | { |
| 162 | state=s->state; |
| 163 | |
| 164 | switch(s->state) |
| 165 | { |
| 166 | case SSL_ST_BEFORE: |
| 167 | case SSL_ST_ACCEPT: |
| 168 | case SSL_ST_BEFORE|SSL_ST_ACCEPT: |
| 169 | case SSL_ST_OK|SSL_ST_ACCEPT: |
| 170 | |
| 171 | s->server=1; |
| 172 | if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); |
| 173 | |
| 174 | /* s->version=SSL3_VERSION; */ |
| 175 | s->type=SSL_ST_ACCEPT; |
| 176 | |
| 177 | if (s->init_buf == NULL) |
| 178 | { |
| 179 | if ((buf=BUF_MEM_new()) == NULL) |
| 180 | { |
| 181 | ret= -1; |
| 182 | goto end; |
| 183 | } |
| 184 | if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) |
| 185 | { |
| 186 | ret= -1; |
| 187 | goto end; |
| 188 | } |
| 189 | s->init_buf=buf; |
| 190 | } |
| 191 | |
| 192 | ssl3_init_finished_mac(s); |
| 193 | |
| 194 | s->state=SSL23_ST_SR_CLNT_HELLO_A; |
| 195 | s->ctx->stats.sess_accept++; |
| 196 | s->init_num=0; |
| 197 | break; |
| 198 | |
| 199 | case SSL23_ST_SR_CLNT_HELLO_A: |
| 200 | case SSL23_ST_SR_CLNT_HELLO_B: |
| 201 | |
| 202 | s->shutdown=0; |
| 203 | ret=ssl23_get_client_hello(s); |
| 204 | if (ret >= 0) cb=NULL; |
| 205 | goto end; |
| 206 | /* break; */ |
| 207 | |
| 208 | default: |
| 209 | SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE); |
| 210 | ret= -1; |
| 211 | goto end; |
| 212 | /* break; */ |
| 213 | } |
| 214 | |
| 215 | if ((cb != NULL) && (s->state != state)) |
| 216 | { |
| 217 | new_state=s->state; |
| 218 | s->state=state; |
| 219 | cb(s,SSL_CB_ACCEPT_LOOP,1); |
| 220 | s->state=new_state; |
| 221 | } |
| 222 | } |
| 223 | end: |
| 224 | s->in_handshake--; |
| 225 | if (cb != NULL) |
| 226 | cb(s,SSL_CB_ACCEPT_EXIT,ret); |
| 227 | return(ret); |
| 228 | } |
| 229 | |
| 230 | |
| 231 | int ssl23_get_client_hello(SSL *s) |
| 232 | { |
| 233 | char buf_space[11]; /* Request this many bytes in initial read. |
| 234 | * We can detect SSL 3.0/TLS 1.0 Client Hellos |
| 235 | * ('type == 3') correctly only when the following |
| 236 | * is in a single record, which is not guaranteed by |
| 237 | * the protocol specification: |
| 238 | * Byte Content |
| 239 | * 0 type \ |
| 240 | * 1/2 version > record header |
| 241 | * 3/4 length / |
| 242 | * 5 msg_type \ |
| 243 | * 6-8 length > Client Hello message |
| 244 | * 9/10 client_version / |
| 245 | */ |
| 246 | char *buf= &(buf_space[0]); |
| 247 | unsigned char *p,*d,*d_len,*dd; |
| 248 | unsigned int i; |
| 249 | unsigned int csl,sil,cl; |
| 250 | int n=0,j; |
| 251 | int type=0; |
| 252 | int v[2]; |
| 253 | |
| 254 | if (s->state == SSL23_ST_SR_CLNT_HELLO_A) |
| 255 | { |
| 256 | /* read the initial header */ |
| 257 | v[0]=v[1]=0; |
| 258 | |
| 259 | if (!ssl3_setup_buffers(s)) goto err; |
| 260 | |
| 261 | n=ssl23_read_bytes(s, sizeof buf_space); |
| 262 | if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */ |
| 263 | |
| 264 | p=s->packet; |
| 265 | |
| 266 | memcpy(buf,p,n); |
| 267 | |
| 268 | if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO)) |
| 269 | { |
| 270 | /* |
| 271 | * SSLv2 header |
| 272 | */ |
| 273 | if ((p[3] == 0x00) && (p[4] == 0x02)) |
| 274 | { |
| 275 | v[0]=p[3]; v[1]=p[4]; |
| 276 | /* SSLv2 */ |
| 277 | if (!(s->options & SSL_OP_NO_SSLv2)) |
| 278 | type=1; |
| 279 | } |
| 280 | else if (p[3] == SSL3_VERSION_MAJOR) |
| 281 | { |
| 282 | v[0]=p[3]; v[1]=p[4]; |
| 283 | /* SSLv3/TLSv1 */ |
| 284 | if (p[4] >= TLS1_VERSION_MINOR) |
| 285 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 286 | if (!(s->options & SSL_OP_NO_TLSv1)) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 287 | { |
| 288 | s->version=TLS1_VERSION; |
| 289 | /* type=2; */ /* done later to survive restarts */ |
| 290 | s->state=SSL23_ST_SR_CLNT_HELLO_B; |
| 291 | } |
| 292 | else if (!(s->options & SSL_OP_NO_SSLv3)) |
| 293 | { |
| 294 | s->version=SSL3_VERSION; |
| 295 | /* type=2; */ |
| 296 | s->state=SSL23_ST_SR_CLNT_HELLO_B; |
| 297 | } |
| 298 | else if (!(s->options & SSL_OP_NO_SSLv2)) |
| 299 | { |
| 300 | type=1; |
| 301 | } |
| 302 | } |
| 303 | else if (!(s->options & SSL_OP_NO_SSLv3)) |
| 304 | { |
| 305 | s->version=SSL3_VERSION; |
| 306 | /* type=2; */ |
| 307 | s->state=SSL23_ST_SR_CLNT_HELLO_B; |
| 308 | } |
| 309 | else if (!(s->options & SSL_OP_NO_SSLv2)) |
| 310 | type=1; |
| 311 | |
| 312 | } |
| 313 | } |
| 314 | else if ((p[0] == SSL3_RT_HANDSHAKE) && |
| 315 | (p[1] == SSL3_VERSION_MAJOR) && |
| 316 | (p[5] == SSL3_MT_CLIENT_HELLO) && |
| 317 | ((p[3] == 0 && p[4] < 5 /* silly record length? */) |
| 318 | || (p[9] >= p[1]))) |
| 319 | { |
| 320 | /* |
| 321 | * SSLv3 or tls1 header |
| 322 | */ |
| 323 | |
| 324 | v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */ |
| 325 | /* We must look at client_version inside the Client Hello message |
| 326 | * to get the correct minor version. |
| 327 | * However if we have only a pathologically small fragment of the |
| 328 | * Client Hello message, this would be difficult, and we'd have |
| 329 | * to read more records to find out. |
| 330 | * No known SSL 3.0 client fragments ClientHello like this, |
| 331 | * so we simply assume TLS 1.0 to avoid protocol version downgrade |
| 332 | * attacks. */ |
| 333 | if (p[3] == 0 && p[4] < 6) |
| 334 | { |
| 335 | #if 0 |
| 336 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL); |
| 337 | goto err; |
| 338 | #else |
| 339 | v[1] = TLS1_VERSION_MINOR; |
| 340 | #endif |
| 341 | } |
| 342 | /* if major version number > 3 set minor to a value |
| 343 | * which will use the highest version 3 we support. |
| 344 | * If TLS 2.0 ever appears we will need to revise |
| 345 | * this.... |
| 346 | */ |
| 347 | else if (p[9] > SSL3_VERSION_MAJOR) |
| 348 | v[1]=0xff; |
| 349 | else |
| 350 | v[1]=p[10]; /* minor version according to client_version */ |
| 351 | if (v[1] >= TLS1_VERSION_MINOR) |
| 352 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 353 | if (!(s->options & SSL_OP_NO_TLSv1)) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 354 | { |
| 355 | s->version=TLS1_VERSION; |
| 356 | type=3; |
| 357 | } |
| 358 | else if (!(s->options & SSL_OP_NO_SSLv3)) |
| 359 | { |
| 360 | s->version=SSL3_VERSION; |
| 361 | type=3; |
| 362 | } |
| 363 | } |
| 364 | else |
| 365 | { |
| 366 | /* client requests SSL 3.0 */ |
| 367 | if (!(s->options & SSL_OP_NO_SSLv3)) |
| 368 | { |
| 369 | s->version=SSL3_VERSION; |
| 370 | type=3; |
| 371 | } |
| 372 | else if (!(s->options & SSL_OP_NO_TLSv1)) |
| 373 | { |
| 374 | /* we won't be able to use TLS of course, |
| 375 | * but this will send an appropriate alert */ |
| 376 | s->version=TLS1_VERSION; |
| 377 | type=3; |
| 378 | } |
| 379 | } |
| 380 | } |
| 381 | else if ((strncmp("GET ", (char *)p,4) == 0) || |
| 382 | (strncmp("POST ",(char *)p,5) == 0) || |
| 383 | (strncmp("HEAD ",(char *)p,5) == 0) || |
| 384 | (strncmp("PUT ", (char *)p,4) == 0)) |
| 385 | { |
| 386 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST); |
| 387 | goto err; |
| 388 | } |
| 389 | else if (strncmp("CONNECT",(char *)p,7) == 0) |
| 390 | { |
| 391 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST); |
| 392 | goto err; |
| 393 | } |
| 394 | } |
| 395 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 396 | if (s->state == SSL23_ST_SR_CLNT_HELLO_B) |
| 397 | { |
| 398 | /* we have SSLv3/TLSv1 in an SSLv2 header |
| 399 | * (other cases skip this state) */ |
| 400 | |
| 401 | type=2; |
| 402 | p=s->packet; |
| 403 | v[0] = p[3]; /* == SSL3_VERSION_MAJOR */ |
| 404 | v[1] = p[4]; |
| 405 | |
| 406 | /* The SSL2 protocol allows n to be larger, just pick |
| 407 | * a reasonable buffer size. */ |
| 408 | #if SSL3_RT_DEFAULT_PACKET_SIZE < 1024*4 - SSL3_RT_DEFAULT_WRITE_OVERHEAD |
| 409 | #error "SSL3_RT_DEFAULT_PACKET_SIZE is too small." |
| 410 | #endif |
| 411 | n=((p[0]&0x7f)<<8)|p[1]; |
| 412 | if (n > SSL3_RT_DEFAULT_PACKET_SIZE - 2) |
| 413 | { |
| 414 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE); |
| 415 | goto err; |
| 416 | } |
| 417 | |
| 418 | j=ssl23_read_bytes(s,n+2); |
| 419 | if (j <= 0) return(j); |
| 420 | |
| 421 | ssl3_finish_mac(s, s->packet+2, s->packet_length-2); |
| 422 | if (s->msg_callback) |
| 423 | s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg); /* CLIENT-HELLO */ |
| 424 | |
| 425 | p=s->packet; |
| 426 | p+=5; |
| 427 | n2s(p,csl); |
| 428 | n2s(p,sil); |
| 429 | n2s(p,cl); |
| 430 | d=(unsigned char *)s->init_buf->data; |
| 431 | if ((csl+sil+cl+11) != s->packet_length) /* We can't have TLS extensions in SSL 2.0 format |
| 432 | * Client Hello, can we? Error condition should be |
| 433 | * '>' otherweise */ |
| 434 | { |
| 435 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH); |
| 436 | goto err; |
| 437 | } |
| 438 | |
| 439 | /* record header: msg_type ... */ |
| 440 | *(d++) = SSL3_MT_CLIENT_HELLO; |
| 441 | /* ... and length (actual value will be written later) */ |
| 442 | d_len = d; |
| 443 | d += 3; |
| 444 | |
| 445 | /* client_version */ |
| 446 | *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */ |
| 447 | *(d++) = v[1]; |
| 448 | |
| 449 | /* lets populate the random area */ |
| 450 | /* get the challenge_length */ |
| 451 | i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl; |
| 452 | memset(d,0,SSL3_RANDOM_SIZE); |
| 453 | memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i); |
| 454 | d+=SSL3_RANDOM_SIZE; |
| 455 | |
| 456 | /* no session-id reuse */ |
| 457 | *(d++)=0; |
| 458 | |
| 459 | /* ciphers */ |
| 460 | j=0; |
| 461 | dd=d; |
| 462 | d+=2; |
| 463 | for (i=0; i<csl; i+=3) |
| 464 | { |
| 465 | if (p[i] != 0) continue; |
| 466 | *(d++)=p[i+1]; |
| 467 | *(d++)=p[i+2]; |
| 468 | j+=2; |
| 469 | } |
| 470 | s2n(j,dd); |
| 471 | |
| 472 | /* COMPRESSION */ |
| 473 | *(d++)=1; |
| 474 | *(d++)=0; |
| 475 | |
| 476 | #if 0 |
| 477 | /* copy any remaining data with may be extensions */ |
| 478 | p = p+csl+sil+cl; |
| 479 | while (p < s->packet+s->packet_length) |
| 480 | { |
| 481 | *(d++)=*(p++); |
| 482 | } |
| 483 | #endif |
| 484 | |
| 485 | i = (d-(unsigned char *)s->init_buf->data) - 4; |
| 486 | l2n3((long)i, d_len); |
| 487 | |
| 488 | /* get the data reused from the init_buf */ |
| 489 | s->s3->tmp.reuse_message=1; |
| 490 | s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO; |
| 491 | s->s3->tmp.message_size=i; |
| 492 | } |
| 493 | |
| 494 | /* imaginary new state (for program structure): */ |
| 495 | /* s->state = SSL23_SR_CLNT_HELLO_C */ |
| 496 | |
| 497 | if (type == 1) |
| 498 | { |
| 499 | #ifdef OPENSSL_NO_SSL2 |
| 500 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); |
| 501 | goto err; |
| 502 | #else |
| 503 | /* we are talking sslv2 */ |
| 504 | /* we need to clean up the SSLv3/TLSv1 setup and put in the |
| 505 | * sslv2 stuff. */ |
| 506 | |
| 507 | if (s->s2 == NULL) |
| 508 | { |
| 509 | if (!ssl2_new(s)) |
| 510 | goto err; |
| 511 | } |
| 512 | else |
| 513 | ssl2_clear(s); |
| 514 | |
| 515 | if (s->s3 != NULL) ssl3_free(s); |
| 516 | |
| 517 | if (!BUF_MEM_grow_clean(s->init_buf, |
| 518 | SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) |
| 519 | { |
| 520 | goto err; |
| 521 | } |
| 522 | |
| 523 | s->state=SSL2_ST_GET_CLIENT_HELLO_A; |
| 524 | if (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3) |
| 525 | s->s2->ssl2_rollback=0; |
| 526 | else |
| 527 | /* reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0 |
| 528 | * (SSL 3.0 draft/RFC 2246, App. E.2) */ |
| 529 | s->s2->ssl2_rollback=1; |
| 530 | |
| 531 | /* setup the n bytes we have read so we get them from |
| 532 | * the sslv2 buffer */ |
| 533 | s->rstate=SSL_ST_READ_HEADER; |
| 534 | s->packet_length=n; |
| 535 | s->packet= &(s->s2->rbuf[0]); |
| 536 | memcpy(s->packet,buf,n); |
| 537 | s->s2->rbuf_left=n; |
| 538 | s->s2->rbuf_offs=0; |
| 539 | |
| 540 | s->method=SSLv2_server_method(); |
| 541 | s->handshake_func=s->method->ssl_accept; |
| 542 | #endif |
| 543 | } |
| 544 | |
| 545 | if ((type == 2) || (type == 3)) |
| 546 | { |
| 547 | /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */ |
| 548 | |
| 549 | if (!ssl_init_wbio_buffer(s,1)) goto err; |
| 550 | |
| 551 | /* we are in this state */ |
| 552 | s->state=SSL3_ST_SR_CLNT_HELLO_A; |
| 553 | |
| 554 | if (type == 3) |
| 555 | { |
| 556 | /* put the 'n' bytes we have read into the input buffer |
| 557 | * for SSLv3 */ |
| 558 | s->rstate=SSL_ST_READ_HEADER; |
| 559 | s->packet_length=n; |
| 560 | if (s->s3->rbuf.buf == NULL) |
| 561 | if (!ssl3_setup_read_buffer(s)) |
| 562 | goto err; |
| 563 | |
| 564 | s->packet= &(s->s3->rbuf.buf[0]); |
| 565 | memcpy(s->packet,buf,n); |
| 566 | s->s3->rbuf.left=n; |
| 567 | s->s3->rbuf.offset=0; |
| 568 | } |
| 569 | else |
| 570 | { |
| 571 | s->packet_length=0; |
| 572 | s->s3->rbuf.left=0; |
| 573 | s->s3->rbuf.offset=0; |
| 574 | } |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 575 | |
| 576 | if (s->version == TLS1_VERSION) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 577 | s->method = TLSv1_server_method(); |
| 578 | else |
| 579 | s->method = SSLv3_server_method(); |
| 580 | #if 0 /* ssl3_get_client_hello does this */ |
| 581 | s->client_version=(v[0]<<8)|v[1]; |
| 582 | #endif |
| 583 | s->handshake_func=s->method->ssl_accept; |
| 584 | } |
| 585 | |
| 586 | if ((type < 1) || (type > 3)) |
| 587 | { |
| 588 | /* bad, very bad */ |
| 589 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL); |
| 590 | goto err; |
| 591 | } |
| 592 | s->init_num=0; |
| 593 | |
| 594 | if (buf != buf_space) OPENSSL_free(buf); |
| 595 | return(SSL_accept(s)); |
| 596 | err: |
| 597 | if (buf != buf_space) OPENSSL_free(buf); |
| 598 | return(-1); |
| 599 | } |