Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* ssl/s2_pkt.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) 1998-2001 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 "ssl_locl.h" |
| 113 | #ifndef OPENSSL_NO_SSL2 |
| 114 | #include <stdio.h> |
| 115 | #include <errno.h> |
| 116 | #define USE_SOCKETS |
| 117 | |
| 118 | static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend); |
| 119 | static int n_do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len); |
| 120 | static int write_pending(SSL *s, const unsigned char *buf, unsigned int len); |
| 121 | static int ssl_mt_error(int n); |
| 122 | |
| 123 | |
| 124 | /* SSL 2.0 imlementation for SSL_read/SSL_peek - |
| 125 | * This routine will return 0 to len bytes, decrypted etc if required. |
| 126 | */ |
| 127 | static int ssl2_read_internal(SSL *s, void *buf, int len, int peek) |
| 128 | { |
| 129 | int n; |
| 130 | unsigned char mac[MAX_MAC_SIZE]; |
| 131 | unsigned char *p; |
| 132 | int i; |
| 133 | int mac_size; |
| 134 | |
| 135 | ssl2_read_again: |
| 136 | if (SSL_in_init(s) && !s->in_handshake) |
| 137 | { |
| 138 | n=s->handshake_func(s); |
| 139 | if (n < 0) return(n); |
| 140 | if (n == 0) |
| 141 | { |
| 142 | SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_SSL_HANDSHAKE_FAILURE); |
| 143 | return(-1); |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | clear_sys_error(); |
| 148 | s->rwstate=SSL_NOTHING; |
| 149 | if (len <= 0) return(len); |
| 150 | |
| 151 | if (s->s2->ract_data_length != 0) /* read from buffer */ |
| 152 | { |
| 153 | if (len > s->s2->ract_data_length) |
| 154 | n=s->s2->ract_data_length; |
| 155 | else |
| 156 | n=len; |
| 157 | |
| 158 | memcpy(buf,s->s2->ract_data,(unsigned int)n); |
| 159 | if (!peek) |
| 160 | { |
| 161 | s->s2->ract_data_length-=n; |
| 162 | s->s2->ract_data+=n; |
| 163 | if (s->s2->ract_data_length == 0) |
| 164 | s->rstate=SSL_ST_READ_HEADER; |
| 165 | } |
| 166 | |
| 167 | return(n); |
| 168 | } |
| 169 | |
| 170 | /* s->s2->ract_data_length == 0 |
| 171 | * |
| 172 | * Fill the buffer, then goto ssl2_read_again. |
| 173 | */ |
| 174 | |
| 175 | if (s->rstate == SSL_ST_READ_HEADER) |
| 176 | { |
| 177 | if (s->first_packet) |
| 178 | { |
| 179 | n=read_n(s,5,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0); |
| 180 | if (n <= 0) return(n); /* error or non-blocking */ |
| 181 | s->first_packet=0; |
| 182 | p=s->packet; |
| 183 | if (!((p[0] & 0x80) && ( |
| 184 | (p[2] == SSL2_MT_CLIENT_HELLO) || |
| 185 | (p[2] == SSL2_MT_SERVER_HELLO)))) |
| 186 | { |
| 187 | SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_NON_SSLV2_INITIAL_PACKET); |
| 188 | return(-1); |
| 189 | } |
| 190 | } |
| 191 | else |
| 192 | { |
| 193 | n=read_n(s,2,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0); |
| 194 | if (n <= 0) return(n); /* error or non-blocking */ |
| 195 | } |
| 196 | /* part read stuff */ |
| 197 | |
| 198 | s->rstate=SSL_ST_READ_BODY; |
| 199 | p=s->packet; |
| 200 | /* Do header */ |
| 201 | /*s->s2->padding=0;*/ |
| 202 | s->s2->escape=0; |
| 203 | s->s2->rlength=(((unsigned int)p[0])<<8)|((unsigned int)p[1]); |
| 204 | if ((p[0] & TWO_BYTE_BIT)) /* Two byte header? */ |
| 205 | { |
| 206 | s->s2->three_byte_header=0; |
| 207 | s->s2->rlength&=TWO_BYTE_MASK; |
| 208 | } |
| 209 | else |
| 210 | { |
| 211 | s->s2->three_byte_header=1; |
| 212 | s->s2->rlength&=THREE_BYTE_MASK; |
| 213 | |
| 214 | /* security >s2->escape */ |
| 215 | s->s2->escape=((p[0] & SEC_ESC_BIT))?1:0; |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | if (s->rstate == SSL_ST_READ_BODY) |
| 220 | { |
| 221 | n=s->s2->rlength+2+s->s2->three_byte_header; |
| 222 | if (n > (int)s->packet_length) |
| 223 | { |
| 224 | n-=s->packet_length; |
| 225 | i=read_n(s,(unsigned int)n,(unsigned int)n,1); |
| 226 | if (i <= 0) return(i); /* ERROR */ |
| 227 | } |
| 228 | |
| 229 | p= &(s->packet[2]); |
| 230 | s->rstate=SSL_ST_READ_HEADER; |
| 231 | if (s->s2->three_byte_header) |
| 232 | s->s2->padding= *(p++); |
| 233 | else s->s2->padding=0; |
| 234 | |
| 235 | /* Data portion */ |
| 236 | if (s->s2->clear_text) |
| 237 | { |
| 238 | mac_size = 0; |
| 239 | s->s2->mac_data=p; |
| 240 | s->s2->ract_data=p; |
| 241 | if (s->s2->padding) |
| 242 | { |
| 243 | SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING); |
| 244 | return(-1); |
| 245 | } |
| 246 | } |
| 247 | else |
| 248 | { |
| 249 | mac_size=EVP_MD_CTX_size(s->read_hash); |
| 250 | if (mac_size < 0) |
| 251 | return -1; |
| 252 | OPENSSL_assert(mac_size <= MAX_MAC_SIZE); |
| 253 | s->s2->mac_data=p; |
| 254 | s->s2->ract_data= &p[mac_size]; |
| 255 | if (s->s2->padding + mac_size > s->s2->rlength) |
| 256 | { |
| 257 | SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING); |
| 258 | return(-1); |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | s->s2->ract_data_length=s->s2->rlength; |
| 263 | /* added a check for length > max_size in case |
| 264 | * encryption was not turned on yet due to an error */ |
| 265 | if ((!s->s2->clear_text) && |
| 266 | (s->s2->rlength >= (unsigned int)mac_size)) |
| 267 | { |
| 268 | ssl2_enc(s,0); |
| 269 | s->s2->ract_data_length-=mac_size; |
| 270 | ssl2_mac(s,mac,0); |
| 271 | s->s2->ract_data_length-=s->s2->padding; |
| 272 | if ( (memcmp(mac,s->s2->mac_data, |
| 273 | (unsigned int)mac_size) != 0) || |
| 274 | (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0)) |
| 275 | { |
| 276 | SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_MAC_DECODE); |
| 277 | return(-1); |
| 278 | } |
| 279 | } |
| 280 | INC32(s->s2->read_sequence); /* expect next number */ |
| 281 | /* s->s2->ract_data is now available for processing */ |
| 282 | |
| 283 | /* Possibly the packet that we just read had 0 actual data bytes. |
| 284 | * (SSLeay/OpenSSL itself never sends such packets; see ssl2_write.) |
| 285 | * In this case, returning 0 would be interpreted by the caller |
| 286 | * as indicating EOF, so it's not a good idea. Instead, we just |
| 287 | * continue reading; thus ssl2_read_internal may have to process |
| 288 | * multiple packets before it can return. |
| 289 | * |
| 290 | * [Note that using select() for blocking sockets *never* guarantees |
| 291 | * that the next SSL_read will not block -- the available |
| 292 | * data may contain incomplete packets, and except for SSL 2, |
| 293 | * renegotiation can confuse things even more.] */ |
| 294 | |
| 295 | goto ssl2_read_again; /* This should really be |
| 296 | * "return ssl2_read(s,buf,len)", |
| 297 | * but that would allow for |
| 298 | * denial-of-service attacks if a |
| 299 | * C compiler is used that does not |
| 300 | * recognize end-recursion. */ |
| 301 | } |
| 302 | else |
| 303 | { |
| 304 | SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_STATE); |
| 305 | return(-1); |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | int ssl2_read(SSL *s, void *buf, int len) |
| 310 | { |
| 311 | return ssl2_read_internal(s, buf, len, 0); |
| 312 | } |
| 313 | |
| 314 | int ssl2_peek(SSL *s, void *buf, int len) |
| 315 | { |
| 316 | return ssl2_read_internal(s, buf, len, 1); |
| 317 | } |
| 318 | |
| 319 | static int read_n(SSL *s, unsigned int n, unsigned int max, |
| 320 | unsigned int extend) |
| 321 | { |
| 322 | int i,off,newb; |
| 323 | |
| 324 | /* if there is stuff still in the buffer from a previous read, |
| 325 | * and there is more than we want, take some. */ |
| 326 | if (s->s2->rbuf_left >= (int)n) |
| 327 | { |
| 328 | if (extend) |
| 329 | s->packet_length+=n; |
| 330 | else |
| 331 | { |
| 332 | s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]); |
| 333 | s->packet_length=n; |
| 334 | } |
| 335 | s->s2->rbuf_left-=n; |
| 336 | s->s2->rbuf_offs+=n; |
| 337 | return(n); |
| 338 | } |
| 339 | |
| 340 | if (!s->read_ahead) max=n; |
| 341 | if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) |
| 342 | max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2; |
| 343 | |
| 344 | |
| 345 | /* Else we want more than we have. |
| 346 | * First, if there is some left or we want to extend */ |
| 347 | off=0; |
| 348 | if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend)) |
| 349 | { |
| 350 | newb=s->s2->rbuf_left; |
| 351 | if (extend) |
| 352 | { |
| 353 | off=s->packet_length; |
| 354 | if (s->packet != s->s2->rbuf) |
| 355 | memcpy(s->s2->rbuf,s->packet, |
| 356 | (unsigned int)newb+off); |
| 357 | } |
| 358 | else if (s->s2->rbuf_offs != 0) |
| 359 | { |
| 360 | memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]), |
| 361 | (unsigned int)newb); |
| 362 | s->s2->rbuf_offs=0; |
| 363 | } |
| 364 | s->s2->rbuf_left=0; |
| 365 | } |
| 366 | else |
| 367 | newb=0; |
| 368 | |
| 369 | /* off is the offset to start writing too. |
| 370 | * r->s2->rbuf_offs is the 'unread data', now 0. |
| 371 | * newb is the number of new bytes so far |
| 372 | */ |
| 373 | s->packet=s->s2->rbuf; |
| 374 | while (newb < (int)n) |
| 375 | { |
| 376 | clear_sys_error(); |
| 377 | if (s->rbio != NULL) |
| 378 | { |
| 379 | s->rwstate=SSL_READING; |
| 380 | i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]), |
| 381 | max-newb); |
| 382 | } |
| 383 | else |
| 384 | { |
| 385 | SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET); |
| 386 | i= -1; |
| 387 | } |
| 388 | #ifdef PKT_DEBUG |
| 389 | if (s->debug & 0x01) sleep(1); |
| 390 | #endif |
| 391 | if (i <= 0) |
| 392 | { |
| 393 | s->s2->rbuf_left+=newb; |
| 394 | return(i); |
| 395 | } |
| 396 | newb+=i; |
| 397 | } |
| 398 | |
| 399 | /* record unread data */ |
| 400 | if (newb > (int)n) |
| 401 | { |
| 402 | s->s2->rbuf_offs=n+off; |
| 403 | s->s2->rbuf_left=newb-n; |
| 404 | } |
| 405 | else |
| 406 | { |
| 407 | s->s2->rbuf_offs=0; |
| 408 | s->s2->rbuf_left=0; |
| 409 | } |
| 410 | if (extend) |
| 411 | s->packet_length+=n; |
| 412 | else |
| 413 | s->packet_length=n; |
| 414 | s->rwstate=SSL_NOTHING; |
| 415 | return(n); |
| 416 | } |
| 417 | |
| 418 | int ssl2_write(SSL *s, const void *_buf, int len) |
| 419 | { |
| 420 | const unsigned char *buf=_buf; |
| 421 | unsigned int n,tot; |
| 422 | int i; |
| 423 | |
| 424 | if (SSL_in_init(s) && !s->in_handshake) |
| 425 | { |
| 426 | i=s->handshake_func(s); |
| 427 | if (i < 0) return(i); |
| 428 | if (i == 0) |
| 429 | { |
| 430 | SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE); |
| 431 | return(-1); |
| 432 | } |
| 433 | } |
| 434 | |
| 435 | if (s->error) |
| 436 | { |
| 437 | ssl2_write_error(s); |
| 438 | if (s->error) |
| 439 | return(-1); |
| 440 | } |
| 441 | |
| 442 | clear_sys_error(); |
| 443 | s->rwstate=SSL_NOTHING; |
| 444 | if (len <= 0) return(len); |
| 445 | |
| 446 | tot=s->s2->wnum; |
| 447 | s->s2->wnum=0; |
| 448 | |
| 449 | n=(len-tot); |
| 450 | for (;;) |
| 451 | { |
| 452 | i=n_do_ssl_write(s,&(buf[tot]),n); |
| 453 | if (i <= 0) |
| 454 | { |
| 455 | s->s2->wnum=tot; |
| 456 | return(i); |
| 457 | } |
| 458 | if ((i == (int)n) || |
| 459 | (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)) |
| 460 | { |
| 461 | return(tot+i); |
| 462 | } |
| 463 | |
| 464 | n-=i; |
| 465 | tot+=i; |
| 466 | } |
| 467 | } |
| 468 | |
| 469 | static int write_pending(SSL *s, const unsigned char *buf, unsigned int len) |
| 470 | { |
| 471 | int i; |
| 472 | |
| 473 | /* s->s2->wpend_len != 0 MUST be true. */ |
| 474 | |
| 475 | /* check that they have given us the same buffer to |
| 476 | * write */ |
| 477 | if ((s->s2->wpend_tot > (int)len) || |
| 478 | ((s->s2->wpend_buf != buf) && |
| 479 | !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))) |
| 480 | { |
| 481 | SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY); |
| 482 | return(-1); |
| 483 | } |
| 484 | |
| 485 | for (;;) |
| 486 | { |
| 487 | clear_sys_error(); |
| 488 | if (s->wbio != NULL) |
| 489 | { |
| 490 | s->rwstate=SSL_WRITING; |
| 491 | i=BIO_write(s->wbio, |
| 492 | (char *)&(s->s2->write_ptr[s->s2->wpend_off]), |
| 493 | (unsigned int)s->s2->wpend_len); |
| 494 | } |
| 495 | else |
| 496 | { |
| 497 | SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET); |
| 498 | i= -1; |
| 499 | } |
| 500 | #ifdef PKT_DEBUG |
| 501 | if (s->debug & 0x01) sleep(1); |
| 502 | #endif |
| 503 | if (i == s->s2->wpend_len) |
| 504 | { |
| 505 | s->s2->wpend_len=0; |
| 506 | s->rwstate=SSL_NOTHING; |
| 507 | return(s->s2->wpend_ret); |
| 508 | } |
| 509 | else if (i <= 0) |
| 510 | return(i); |
| 511 | s->s2->wpend_off+=i; |
| 512 | s->s2->wpend_len-=i; |
| 513 | } |
| 514 | } |
| 515 | |
| 516 | static int n_do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len) |
| 517 | { |
| 518 | unsigned int j,k,olen,p,bs; |
| 519 | int mac_size; |
| 520 | register unsigned char *pp; |
| 521 | |
| 522 | olen=len; |
| 523 | |
| 524 | /* first check if there is data from an encryption waiting to |
| 525 | * be sent - it must be sent because the other end is waiting. |
| 526 | * This will happen with non-blocking IO. We print it and then |
| 527 | * return. |
| 528 | */ |
| 529 | if (s->s2->wpend_len != 0) return(write_pending(s,buf,len)); |
| 530 | |
| 531 | /* set mac_size to mac size */ |
| 532 | if (s->s2->clear_text) |
| 533 | mac_size=0; |
| 534 | else |
| 535 | { |
| 536 | mac_size=EVP_MD_CTX_size(s->write_hash); |
| 537 | if (mac_size < 0) |
| 538 | return -1; |
| 539 | } |
| 540 | |
| 541 | /* lets set the pad p */ |
| 542 | if (s->s2->clear_text) |
| 543 | { |
| 544 | if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) |
| 545 | len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; |
| 546 | p=0; |
| 547 | s->s2->three_byte_header=0; |
| 548 | /* len=len; */ |
| 549 | } |
| 550 | else |
| 551 | { |
| 552 | bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx); |
| 553 | j=len+mac_size; |
| 554 | /* Two-byte headers allow for a larger record length than |
| 555 | * three-byte headers, but we can't use them if we need |
| 556 | * padding or if we have to set the escape bit. */ |
| 557 | if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) && |
| 558 | (!s->s2->escape)) |
| 559 | { |
| 560 | if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) |
| 561 | j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; |
| 562 | /* set k to the max number of bytes with 2 |
| 563 | * byte header */ |
| 564 | k=j-(j%bs); |
| 565 | /* how many data bytes? */ |
| 566 | len=k-mac_size; |
| 567 | s->s2->three_byte_header=0; |
| 568 | p=0; |
| 569 | } |
| 570 | else if ((bs <= 1) && (!s->s2->escape)) |
| 571 | { |
| 572 | /* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus |
| 573 | * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER */ |
| 574 | s->s2->three_byte_header=0; |
| 575 | p=0; |
| 576 | } |
| 577 | else /* we may have to use a 3 byte header */ |
| 578 | { |
| 579 | /* If s->s2->escape is not set, then |
| 580 | * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus |
| 581 | * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. */ |
| 582 | p=(j%bs); |
| 583 | p=(p == 0)?0:(bs-p); |
| 584 | if (s->s2->escape) |
| 585 | { |
| 586 | s->s2->three_byte_header=1; |
| 587 | if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) |
| 588 | j=SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER; |
| 589 | } |
| 590 | else |
| 591 | s->s2->three_byte_header=(p == 0)?0:1; |
| 592 | } |
| 593 | } |
| 594 | |
| 595 | /* Now |
| 596 | * j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER |
| 597 | * holds, and if s->s2->three_byte_header is set, then even |
| 598 | * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER. |
| 599 | */ |
| 600 | |
| 601 | /* mac_size is the number of MAC bytes |
| 602 | * len is the number of data bytes we are going to send |
| 603 | * p is the number of padding bytes |
| 604 | * (if it is a two-byte header, then p == 0) */ |
| 605 | |
| 606 | s->s2->wlength=len; |
| 607 | s->s2->padding=p; |
| 608 | s->s2->mac_data= &(s->s2->wbuf[3]); |
| 609 | s->s2->wact_data= &(s->s2->wbuf[3+mac_size]); |
| 610 | /* we copy the data into s->s2->wbuf */ |
| 611 | memcpy(s->s2->wact_data,buf,len); |
| 612 | if (p) |
| 613 | memset(&(s->s2->wact_data[len]),0,p); /* arbitrary padding */ |
| 614 | |
| 615 | if (!s->s2->clear_text) |
| 616 | { |
| 617 | s->s2->wact_data_length=len+p; |
| 618 | ssl2_mac(s,s->s2->mac_data,1); |
| 619 | s->s2->wlength+=p+mac_size; |
| 620 | ssl2_enc(s,1); |
| 621 | } |
| 622 | |
| 623 | /* package up the header */ |
| 624 | s->s2->wpend_len=s->s2->wlength; |
| 625 | if (s->s2->three_byte_header) /* 3 byte header */ |
| 626 | { |
| 627 | pp=s->s2->mac_data; |
| 628 | pp-=3; |
| 629 | pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8); |
| 630 | if (s->s2->escape) pp[0]|=SEC_ESC_BIT; |
| 631 | pp[1]=s->s2->wlength&0xff; |
| 632 | pp[2]=s->s2->padding; |
| 633 | s->s2->wpend_len+=3; |
| 634 | } |
| 635 | else |
| 636 | { |
| 637 | pp=s->s2->mac_data; |
| 638 | pp-=2; |
| 639 | pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT; |
| 640 | pp[1]=s->s2->wlength&0xff; |
| 641 | s->s2->wpend_len+=2; |
| 642 | } |
| 643 | s->s2->write_ptr=pp; |
| 644 | |
| 645 | INC32(s->s2->write_sequence); /* expect next number */ |
| 646 | |
| 647 | /* lets try to actually write the data */ |
| 648 | s->s2->wpend_tot=olen; |
| 649 | s->s2->wpend_buf=buf; |
| 650 | |
| 651 | s->s2->wpend_ret=len; |
| 652 | |
| 653 | s->s2->wpend_off=0; |
| 654 | return(write_pending(s,buf,olen)); |
| 655 | } |
| 656 | |
| 657 | int ssl2_part_read(SSL *s, unsigned long f, int i) |
| 658 | { |
| 659 | unsigned char *p; |
| 660 | int j; |
| 661 | |
| 662 | if (i < 0) |
| 663 | { |
| 664 | /* ssl2_return_error(s); */ |
| 665 | /* for non-blocking io, |
| 666 | * this is not necessarily fatal */ |
| 667 | return(i); |
| 668 | } |
| 669 | else |
| 670 | { |
| 671 | s->init_num+=i; |
| 672 | |
| 673 | /* Check for error. While there are recoverable errors, |
| 674 | * this function is not called when those must be expected; |
| 675 | * any error detected here is fatal. */ |
| 676 | if (s->init_num >= 3) |
| 677 | { |
| 678 | p=(unsigned char *)s->init_buf->data; |
| 679 | if (p[0] == SSL2_MT_ERROR) |
| 680 | { |
| 681 | j=(p[1]<<8)|p[2]; |
| 682 | SSLerr((int)f,ssl_mt_error(j)); |
| 683 | s->init_num -= 3; |
| 684 | if (s->init_num > 0) |
| 685 | memmove(p, p+3, s->init_num); |
| 686 | } |
| 687 | } |
| 688 | |
| 689 | /* If it's not an error message, we have some error anyway -- |
| 690 | * the message was shorter than expected. This too is treated |
| 691 | * as fatal (at least if SSL_get_error is asked for its opinion). */ |
| 692 | return(0); |
| 693 | } |
| 694 | } |
| 695 | |
| 696 | int ssl2_do_write(SSL *s) |
| 697 | { |
| 698 | int ret; |
| 699 | |
| 700 | ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num); |
| 701 | if (ret == s->init_num) |
| 702 | { |
| 703 | if (s->msg_callback) |
| 704 | s->msg_callback(1, s->version, 0, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg); |
| 705 | return(1); |
| 706 | } |
| 707 | if (ret < 0) |
| 708 | return(-1); |
| 709 | s->init_off+=ret; |
| 710 | s->init_num-=ret; |
| 711 | return(0); |
| 712 | } |
| 713 | |
| 714 | static int ssl_mt_error(int n) |
| 715 | { |
| 716 | int ret; |
| 717 | |
| 718 | switch (n) |
| 719 | { |
| 720 | case SSL2_PE_NO_CIPHER: |
| 721 | ret=SSL_R_PEER_ERROR_NO_CIPHER; |
| 722 | break; |
| 723 | case SSL2_PE_NO_CERTIFICATE: |
| 724 | ret=SSL_R_PEER_ERROR_NO_CERTIFICATE; |
| 725 | break; |
| 726 | case SSL2_PE_BAD_CERTIFICATE: |
| 727 | ret=SSL_R_PEER_ERROR_CERTIFICATE; |
| 728 | break; |
| 729 | case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE: |
| 730 | ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE; |
| 731 | break; |
| 732 | default: |
| 733 | ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE; |
| 734 | break; |
| 735 | } |
| 736 | return(ret); |
| 737 | } |
| 738 | #else /* !OPENSSL_NO_SSL2 */ |
| 739 | |
| 740 | # if PEDANTIC |
| 741 | static void *dummy=&dummy; |
| 742 | # endif |
| 743 | |
| 744 | #endif |