ssl/s3_pkt.c

   1 /* ssl/s3_pkt.c */
   2 /* Copyright (C) 1995-1997 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 #include <stdio.h>
  60 #include <errno.h>
  61 #define USE_SOCKETS
  62 #include "evp.h"
  63 #include "buffer.h"
  64 #include "ssl_locl.h"
  65
  66 /* SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_PEER_ERROR_NO_CIPHER);
  67  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_PEER_ERROR_NO_CERTIFICATE);
  68  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_PEER_ERROR_CERTIFICATE);
  69  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE);
  70  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_UNKNOWN_REMOTE_ERROR_TYPE);
  71  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_UNEXPECTED_MESSAGE);
  72  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_BAD_RECORD_MAC);
  73  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_DECOMPRESSION_FAILURE);
  74  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_HANDSHAKE_FAILURE);
  75  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_NO_CERTIFICATE);
  76  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_BAD_CERTIFICATE);
  77  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_UNSUPPORTED_CERTIFICATE);
  78  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_CERTIFICATE_REVOKED);
  79  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_CERTIFICATE_EXPIRED);
  80  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_CERTIFICATE_UNKNOWN);
  81  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_ILLEGAL_PARAMETER);
  82  */
  83
  84 #ifndef NOPROTO
  85 static int do_ssl3_write(SSL *s, int type, char *buf, unsigned int len);
  86 static int ssl3_write_pending(SSL *s, int type, char *buf, unsigned int len);
  87 static int ssl3_get_record(SSL *s);
  88 static int do_compress(SSL *ssl);
  89 static int do_uncompress(SSL *ssl);
  90 #else
  91 static int do_ssl3_write();
  92 static int ssl3_write_pending();
  93 static int ssl3_get_record();
  94 static int do_compress();
  95 static int do_uncompress();
  96 #endif
  97
  98 static int ssl3_read_n(s,n,max,extend)
  99 SSL *s;
 100 int n;
 101 int max;
 102 int extend;
 103         {
 104         int i,off,newb;
 105
 106         /* if there is stuff still in the buffer from a previous read,
 107          * and there is more than we want, take some. */
 108         if (s->s3->rbuf.left >= (int)n)
 109                 {
 110                 if (extend)
 111                         s->packet_length+=n;
 112                 else
 113                         {
 114                         s->packet= &(s->s3->rbuf.buf[s->s3->rbuf.offset]);
 115                         s->packet_length=n;
 116                         }
 117                 s->s3->rbuf.left-=n;
 118                 s->s3->rbuf.offset+=n;
 119                 return(n);
 120                 }
 121
 122         /* else we need to read more data */
 123         if (!s->read_ahead) max=n;
 124         if (max > SSL3_RT_MAX_PACKET_SIZE)
 125                 max=SSL3_RT_MAX_PACKET_SIZE;
 126
 127         /* First check if there is some left or we want to extend */
 128         off=0;
 129         if (    (s->s3->rbuf.left != 0) ||
 130                 ((s->packet_length != 0) && extend))
 131                 {
 132                 newb=s->s3->rbuf.left;
 133                 if (extend)
 134                         {
 135                         /* Copy bytes back to the front of the buffer
 136                          * Take the bytes already pointed to by 'packet'
 137                          * and take the extra ones on the end. */
 138                         off=s->packet_length;
 139                         if (s->packet != s->s3->rbuf.buf)
 140                                 memcpy(s->s3->rbuf.buf,s->packet,newb+off);
 141                         }
 142                 else if (s->s3->rbuf.offset != 0)
 143                         { /* so the data is not at the start of the buffer */
 144                         memcpy(s->s3->rbuf.buf,
 145                                 &(s->s3->rbuf.buf[s->s3->rbuf.offset]),newb);
 146                         s->s3->rbuf.offset=0;
 147                         }
 148
 149                 s->s3->rbuf.left=0;
 150                 }
 151         else
 152                 newb=0;
 153
 154         /* So we now have 'newb' bytes at the front of
 155          * s->s3->rbuf.buf and need to read some more in on the end
 156          * We start reading into the buffer at 's->s3->rbuf.offset'
 157          */
 158         s->packet=s->s3->rbuf.buf;
 159
 160         while (newb < n)
 161                 {
 162                 errno=0;
 163                 if (s->rbio != NULL)
 164                         {
 165                         s->rwstate=SSL_READING;
 166                         i=BIO_read(s->rbio,
 167                                 (char *)&(s->s3->rbuf.buf[off+newb]),
 168                                 max-newb);
 169                         }
 170                 else
 171                         {
 172                         SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
 173                         i= -1;
 174                         }
 175
 176                 if (i <= 0)
 177                         {
 178                         s->s3->rbuf.left+=newb;
 179                         return(i);
 180                         }
 181                 newb+=i;
 182                 }
 183
 184         /* record used data read */
 185         if (newb > n)
 186                 {
 187                 s->s3->rbuf.offset=n+off;
 188                 s->s3->rbuf.left=newb-n;
 189                 }
 190         else
 191                 {
 192                 s->s3->rbuf.offset=0;
 193                 s->s3->rbuf.left=0;
 194                 }
 195
 196         if (extend)
 197                 s->packet_length+=n;
 198         else
 199                 s->packet_length+=n;
 200         return(n);
 201         }
 202
 203 /* Call this to get a new input record.
 204  * It will return <= 0 if more data is needed, normally due to an error
 205  * or non-blocking IO.
 206  * When it finishes, one packet has been decoded and can be found in
 207  * ssl->s3->rrec.type   - is the type of record
 208  * ssl->s3->rrec.data,  - data
 209  * ssl->s3->rrec.length, - number of bytes
 210  */
 211 static int ssl3_get_record(s)
 212 SSL *s;
 213         {
 214         int ssl_major,ssl_minor,al;
 215         int n,i,ret= -1;
 216         SSL3_BUFFER *rb;
 217         SSL3_RECORD *rr;
 218         SSL_SESSION *sess;
 219         unsigned char *p;
 220         unsigned char md[EVP_MAX_MD_SIZE];
 221         short version;
 222         unsigned int mac_size;
 223         int clear=0,extra;
 224
 225         rr= &(s->s3->rrec);
 226         rb= &(s->s3->rbuf);
 227         sess=s->session;
 228
 229         if (s->ctx->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 230                 extra=SSL3_RT_MAX_EXTRA;
 231         else
 232                 extra=0;
 233
 234 again:
 235         /* check if we have the header */
 236         if (    (s->rstate != SSL_ST_READ_BODY) ||
 237                 (s->packet_length < SSL3_RT_HEADER_LENGTH))
 238                 {
 239                 n=ssl3_read_n(s,SSL3_RT_HEADER_LENGTH,
 240                         SSL3_RT_MAX_PACKET_SIZE,0);
 241                 if (n <= 0) return(n); /* error or non-blocking */
 242                 s->rstate=SSL_ST_READ_BODY;
 243
 244                 p=s->packet;
 245
 246                 /* Pull apart the header into the SSL3_RECORD */
 247                 rr->type= *(p++);
 248                 ssl_major= *(p++);
 249                 ssl_minor= *(p++);
 250                 version=(ssl_major<<8)|ssl_minor;
 251                 n2s(p,rr->length);
 252
 253                 /* Lets check version */
 254                 if (s->first_packet)
 255                         {
 256                         s->first_packet=0;
 257                         }
 258                 else
 259                         {
 260                 if (    (ssl_major != SSL3_VERSION_MAJOR) ||
 261                         (ssl_minor != SSL3_VERSION_MINOR))
 262                         {
 263                         al=SSL3_AD_ILLEGAL_PARAMETER;
 264                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 265                         goto f_err;
 266                         }
 267                         }
 268
 269                 if (s->version != SSL3_VERSION_MAJOR)
 270                         {
 271                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_INTERNAL_ERROR);
 272                         goto err;
 273                         }
 274
 275                 if (rr->length >
 276                         (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 277                         {
 278                         al=SSL3_AD_ILLEGAL_PARAMETER;
 279                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
 280                         goto f_err;
 281                         }
 282
 283                 s->rstate=SSL_ST_READ_BODY;
 284                 }
 285
 286         /* get and decode the data */
 287         if (s->rstate == SSL_ST_READ_BODY)
 288                 {
 289                 if (rr->length > (s->packet_length-SSL3_RT_HEADER_LENGTH))
 290                         {
 291                         i=rr->length;
 292                         /*-(s->packet_length-SSL3_RT_HEADER_LENGTH); */
 293                         n=ssl3_read_n(s,i,i,1);
 294                         if (n <= 0) return(n); /* error or non-blocking io */
 295                         }
 296                 s->rstate=SSL_ST_READ_HEADER;
 297                 }
 298
 299         /* At this point, we have the data in s->packet and there should be
 300          * s->packet_length bytes, we must not 'overrun' this buffer :-)
 301          * One of the following functions will copy the data from the
 302          * s->packet buffer */
 303
 304         rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
 305
 306         /* ok, we can now read from 's->packet' data into 'rr'
 307          * rr->input points at rr->length bytes, which
 308          * need to be copied into rr->data by either
 309          * the decryption or by the decompression
 310          * When the data is 'copied' into the rr->data buffer,
 311          * rr->input will be pointed at the new buffer */
 312
 313         /* Set the state for the following operations */
 314         s->rstate=SSL_ST_READ_HEADER;
 315
 316         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
 317          * rr->length bytes of encrypted compressed stuff. */
 318
 319         /* check is not needed I belive */
 320         if (rr->length > (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 321                 {
 322                 al=SSL3_AD_ILLEGAL_PARAMETER;
 323                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
 324                 goto f_err;
 325                 }
 326
 327         /* decrypt in place in 'rr->input' */
 328         rr->data=rr->input;
 329
 330         if (!ssl3_enc(s,0))
 331                 {
 332                 al=SSL3_AD_ILLEGAL_PARAMETER;
 333                 goto f_err;
 334                 }
 335
 336         /* r->length is now the compressed data plus mac */
 337         if (    (sess == NULL) ||
 338                 (s->enc_read_ctx == NULL) ||
 339                 (s->read_hash == NULL))
 340                 clear=1;
 341
 342         if (!clear)
 343                 {
 344                 mac_size=EVP_MD_size(s->read_hash);
 345
 346                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
 347                         {
 348                         al=SSL3_AD_ILLEGAL_PARAMETER;
 349                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
 350                         goto f_err;
 351                         }
 352                 /* check MAC for rr->input' */
 353                 if (rr->length < mac_size)
 354                         {
 355                         al=SSL3_AD_ILLEGAL_PARAMETER;
 356                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
 357                         goto f_err;
 358                         }
 359                 rr->length-=mac_size;
 360                 i=ssl3_mac(s,md,0);
 361                 if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
 362                         {
 363                         al=SSL3_AD_BAD_RECORD_MAC;
 364                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_MAC_DECODE);
 365                         ret=SSL_RWERR_BAD_MAC_DECODE;
 366                         goto f_err;
 367                         }
 368                 }
 369
 370         /* r->length is now just compressed */
 371         if ((sess != NULL) && (sess->read_compression != NULL))
 372                 {
 373                 if (rr->length >
 374                         (unsigned int)SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
 375                         {
 376                         al=SSL3_AD_ILLEGAL_PARAMETER;
 377                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
 378                         goto f_err;
 379                         }
 380                 if (!do_uncompress(s))
 381                         {
 382                         al=SSL3_AD_DECOMPRESSION_FAILURE;
 383                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
 384                         goto f_err;
 385                         }
 386                 }
 387
 388         if (rr->length > (unsigned int)SSL3_RT_MAX_PLAIN_LENGTH+extra)
 389                 {
 390                 al=SSL3_AD_DECOMPRESSION_FAILURE;
 391                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
 392                 goto f_err;
 393                 }
 394
 395         rr->off=0;
 396         /* So at this point the following is true
 397          * ssl->s3->rrec.type   is the type of record
 398          * ssl->s3->rrec.length == number of bytes in record
 399          * ssl->s3->rrec.off    == offset to first valid byte
 400          * ssl->s3->rrec.data   == where to take bytes from, increment
 401          *                         after use :-).
 402          */
 403
 404         /* we have pulled in a full packet so zero things */
 405         s->packet_length=0;
 406
 407         /* just read a 0 length packet */
 408         if (rr->length == 0) goto again;
 409
 410         return(1);
 411 f_err:
 412         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 413 err:
 414         return(ret);
 415         }
 416
 417 static int do_uncompress(ssl)
 418 SSL *ssl;
 419         {
 420         return(1);
 421         }
 422
 423 static int do_compress(ssl)
 424 SSL *ssl;
 425         {
 426         return(1);
 427         }
 428
 429 /* Call this write a data
 430  * It will return <= 0 if not all data has been sent or non-blocking IO.
 431  */
 432 int ssl3_write_bytes(s,type,buf,len)
 433 SSL *s;
 434 int type;
 435 char *buf;
 436 int len;
 437         {
 438         unsigned int tot,n,nw;
 439         int i;
 440
 441         s->rwstate=SSL_NOTHING;
 442         tot=s->s3->wnum;
 443         s->s3->wnum=0;
 444
 445         if (SSL_in_init(s) && !s->in_handshake)
 446                 {
 447                 i=s->handshake_func(s);
 448                 if (i < 0) return(i);
 449                 if (i == 0)
 450                         {
 451                         SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 452                         return(-1);
 453                         }
 454                 }
 455
 456         n=(len-tot);
 457         for (;;)
 458                 {
 459                 if (n > SSL3_RT_MAX_PLAIN_LENGTH)
 460                         nw=SSL3_RT_MAX_PLAIN_LENGTH;
 461                 else
 462                         nw=n;
 463
 464                 i=do_ssl3_write(s,type,&(buf[tot]),nw);
 465                 if (i <= 0)
 466                         {
 467                         s->s3->wnum=tot;
 468                         return(i);
 469                         }
 470
 471                 if (type == SSL3_RT_HANDSHAKE)
 472                         ssl3_finish_mac(s,(unsigned char *)&(buf[tot]),i);
 473
 474                 if (i == (int)n) return(tot+i);
 475
 476                 n-=i;
 477                 tot+=i;
 478                 }
 479         }
 480
 481 static int do_ssl3_write(s,type,buf,len)
 482 SSL *s;
 483 int type;
 484 char *buf;
 485 unsigned int len;
 486         {
 487         unsigned char *p,*plen;
 488         int i,mac_size,clear=0;
 489         SSL3_RECORD *wr;
 490         SSL3_BUFFER *wb;
 491         SSL_SESSION *sess;
 492
 493         /* first check is there is a SSL3_RECORD still being written
 494          * out.  This will happen with non blocking IO */
 495         if (s->s3->wbuf.left != 0)
 496                 return(ssl3_write_pending(s,type,buf,len));
 497
 498         /* If we have an alert to send, lets send it */
 499         if (s->s3->alert_dispatch)
 500                 {
 501                 i=ssl3_dispatch_alert(s);
 502                 if (i <= 0)
 503                         return(i);
 504                 /* if it went, fall through and send more stuff */
 505                 }
 506
 507         if (len <= 0) return(len);
 508
 509         wr= &(s->s3->wrec);
 510         wb= &(s->s3->wbuf);
 511         sess=s->session;
 512
 513         if (    (sess == NULL) ||
 514                 (s->enc_write_ctx == NULL) ||
 515                 (s->write_hash == NULL))
 516                 clear=1;
 517
 518         if (clear)
 519                 mac_size=0;
 520         else
 521                 mac_size=EVP_MD_size(s->write_hash);
 522
 523         p=wb->buf;
 524
 525         /* write the header */
 526         *(p++)=type&0xff;
 527         wr->type=type;
 528
 529         *(p++)=SSL3_VERSION_MAJOR;
 530         *(p++)=SSL3_VERSION_MINOR;
 531
 532         /* record where we are to write out packet length */
 533         plen=p;
 534         p+=2;
 535
 536         /* lets setup the record stuff. */
 537         wr->data=p;
 538         wr->length=(int)len;
 539         wr->input=(unsigned char *)buf;
 540
 541         /* we now 'read' from wr->input, wr->length bytes into
 542          * wr->data */
 543
 544         /* first we compress */
 545         if ((sess != NULL) && (sess->write_compression != NULL))
 546                 {
 547                 if (!do_compress(s))
 548                         {
 549                         SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
 550                         goto err;
 551                         }
 552                 }
 553         else
 554                 {
 555                 memcpy(wr->data,wr->input,wr->length);
 556                 wr->input=wr->data;
 557                 }
 558
 559         /* we should still have the output to wr->data and the input
 560          * from wr->input.  Length should be wr->length.
 561          * wr->data still points in the wb->buf */
 562
 563         if (mac_size != 0)
 564                 {
 565                 ssl3_mac(s,&(p[wr->length]),1);
 566                 wr->length+=mac_size;
 567                 wr->input=p;
 568                 wr->data=p;
 569                 }
 570
 571         /* ssl3_enc can only have an error on read */
 572         ssl3_enc(s,1);
 573
 574         /* record length after mac and block padding */
 575         s2n(wr->length,plen);
 576
 577         /* we should now have
 578          * wr->data pointing to the encrypted data, which is
 579          * wr->length long */
 580         wr->type=type; /* not needed but helps for debugging */
 581         wr->length+=SSL3_RT_HEADER_LENGTH;
 582
 583         /* Now lets setup wb */
 584         wb->left=wr->length;
 585         wb->offset=0;
 586
 587         s->s3->wpend_tot=len;
 588         s->s3->wpend_buf=buf;
 589         s->s3->wpend_type=type;
 590         s->s3->wpend_ret=len;
 591
 592         /* we now just need to write the buffer */
 593         return(ssl3_write_pending(s,type,buf,len));
 594 err:
 595         return(-1);
 596         }
 597
 598 /* if s->s3->wbuf.left != 0, we need to call this */
 599 static int ssl3_write_pending(s,type,buf,len)
 600 SSL *s;
 601 int type;
 602 char *buf;
 603 unsigned int len;
 604         {
 605         int i;
 606
 607         if ((s->s3->wpend_tot != (int)len) || (s->s3->wpend_buf != buf)
 608                 || (s->s3->wpend_type != type))
 609                 {
 610                 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
 611                 return(SSL_RWERR_BAD_WRITE_RETRY);
 612                 }
 613
 614         for (;;)
 615                 {
 616                 errno=0;
 617                 if (s->wbio != NULL)
 618                         {
 619                         s->rwstate=SSL_WRITING;
 620                         i=BIO_write(s->wbio,
 621                                 (char *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]),
 622                                 (unsigned int)s->s3->wbuf.left);
 623                         }
 624                 else
 625                         {
 626                         SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
 627                         i= -1;
 628                         }
 629                 if (i == s->s3->wbuf.left)
 630                         {
 631                         s->s3->wbuf.left=0;
 632                         s->rwstate=SSL_NOTHING;
 633                         return(s->s3->wpend_ret);
 634                         }
 635                 else if (i <= 0)
 636                         return(i);
 637                 s->s3->wbuf.offset+=i;
 638                 s->s3->wbuf.left-=i;
 639                 }
 640         }
 641
 642 int ssl3_read_bytes(s,type,buf,len)
 643 SSL *s;
 644 int type;
 645 char *buf;
 646 int len;
 647         {
 648         int al,i,j,n,ret;
 649         SSL3_RECORD *rr;
 650         unsigned char *sender;
 651         void (*cb)()=NULL;
 652
 653         if (s->s3->rbuf.buf == NULL) /* Not initalised yet */
 654                 if (!ssl3_setup_buffers(s))
 655                         return(-1);
 656
 657         if (!s->in_handshake && SSL_in_before(s))
 658                 {
 659                 i=s->handshake_func(s);
 660                 if (i < 0) return(i);
 661                 if (i == 0)
 662                         {
 663                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 664                         return(-1);
 665                         }
 666                 }
 667 start:
 668         s->rwstate=SSL_NOTHING;
 669
 670         /* s->s3->rrec.type     - is the type of record
 671          * s->s3->rrec.data,    - data
 672          * s->s3->rrec.off,     - ofset into 'data' for next read
 673          * s->s3->rrec.length,  - number of bytes. */
 674         rr= &(s->s3->rrec);
 675
 676         /* get new packet */
 677         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
 678                 {
 679                 ret=ssl3_get_record(s);
 680                 if (ret <= 0) return(ret);
 681                 }
 682
 683         /* we now have a packet which can be read and processed */
 684
 685         if (s->s3->change_cipher_spec && (rr->type != SSL3_RT_HANDSHAKE))
 686                 {
 687                 al=SSL3_AD_UNEXPECTED_MESSAGE;
 688                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
 689                 goto err;
 690                 }
 691
 692         /* If the other end has shutdown, throw anything we read away */
 693         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
 694                 {
 695                 rr->length=0;
 696                 s->rwstate=SSL_NOTHING;
 697                 return(0);
 698                 }
 699
 700         /* Check for an incoming 'Client Request' message */
 701         if ((rr->type == SSL3_RT_HANDSHAKE) && (rr->length == 4) &&
 702                 (rr->data[0] == SSL3_MT_CLIENT_REQUEST) &&
 703                 (s->session != NULL) && (s->session->cipher != NULL))
 704                 {
 705                 if ((rr->data[1] != 0) || (rr->data[2] != 0) ||
 706                         (rr->data[3] != 0))
 707                         {
 708                         al=SSL3_AD_ILLEGAL_PARAMETER;
 709                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CLIENT_REQUEST);
 710                         goto err;
 711                         }
 712
 713                 if (SSL_is_init_finished(s) &&
 714                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
 715                         {
 716                         ssl3_renegotiate(s);
 717                         n=s->handshake_func(s);
 718                         if (n < 0) return(n);
 719                         if (n == 0)
 720                                 {
 721                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 722                                 return(-1);
 723                                 }
 724                         }
 725                 rr->length=0;
 726 /* ZZZ */       goto start;
 727                 }
 728
 729         /* if it is not the type we want, or we have shutdown and want
 730          * the peer shutdown */
 731         if ((rr->type != type) || (s->shutdown & SSL_SENT_SHUTDOWN))
 732                 {
 733                 if (rr->type == SSL3_RT_ALERT)
 734                         {
 735                         if ((rr->length != 2) || (rr->off != 0))
 736                                 {
 737                                 al=SSL3_AD_ILLEGAL_PARAMETER;
 738                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_ALERT_RECORD);
 739                                 goto f_err;
 740                                 }
 741
 742                         i=rr->data[0];
 743                         n=rr->data[1];
 744
 745                         /* clear from buffer */
 746                         rr->length=0;
 747
 748                         if (s->info_callback != NULL)
 749                                 cb=s->info_callback;
 750                         else if (s->ctx->info_callback != NULL)
 751                                 cb=s->ctx->info_callback;
 752
 753                         if (cb != NULL)
 754                                 {
 755                                 j=(i<<8)|n;
 756                                 cb(s,SSL_CB_READ_ALERT,j);
 757                                 }
 758
 759                         if (i == 1)
 760                                 {
 761                                 s->s3->warn_alert=n;
 762                                 if (n == SSL3_AD_CLOSE_NOTIFY)
 763                                         {
 764                                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
 765                                         return(0);
 766                                         }
 767                                 }
 768                         else if (i == 2)
 769                                 {
 770                                 s->rwstate=SSL_NOTHING;
 771                                 s->s3->fatal_alert=n;
 772                                 SSLerr(SSL_F_SSL3_READ_BYTES,1000+n);
 773                                 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
 774                                 SSL_CTX_remove_session(s->ctx,s->session);
 775                                 return(0);
 776                                 }
 777                         else
 778                                 {
 779                                 al=SSL3_AD_ILLEGAL_PARAMETER;
 780                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
 781                                 goto f_err;
 782                                 }
 783
 784                         rr->length=0;
 785                         goto start;
 786                         }
 787
 788                 if (s->shutdown & SSL_SENT_SHUTDOWN)
 789                         {
 790                         s->rwstate=SSL_NOTHING;
 791                         rr->length=0;
 792                         return(0);
 793                         }
 794
 795                 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
 796                         {
 797                         if (    (rr->length != 1) || (rr->off != 0) ||
 798                                 (rr->data[0] != SSL3_MT_CCS))
 799                                 {
 800                                 i=SSL3_AD_ILLEGAL_PARAMETER;
 801                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
 802                                 goto err;
 803                                 }
 804
 805                         rr->length=0;
 806
 807                         s->s3->change_cipher_spec=1;
 808
 809                         if (s->state & SSL_ST_ACCEPT)
 810                                 i=SSL3_CHANGE_CIPHER_SERVER_READ;
 811                         else
 812                                 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
 813
 814                         if (s->s3->tmp.key_block == NULL)
 815                                 {
 816                                 s->session->cipher=s->s3->tmp.new_cipher;
 817                                 if (!ssl3_setup_key_block(s))
 818                                         goto err;
 819                                 }
 820
 821                         if (!ssl3_change_cipher_state(s,i))
 822                                 goto err;
 823
 824                         /* we have to record the message digest at
 825                          * this point so we can get it before we read
 826                          * the finished message */
 827                         sender=(s->state & SSL_ST_CONNECT)
 828                                 ?&(ssl3_server_finished_const[0])
 829                                 :&(ssl3_client_finished_const[0]);
 830
 831                         ssl3_final_finish_mac(s,&(s->s3->finish_dgst1),
 832                                 sender,&(s->s3->tmp.finish_md1[0]));
 833                         ssl3_final_finish_mac(s,&(s->s3->finish_dgst2),
 834                                 sender,&(s->s3->tmp.finish_md2[0]));
 835
 836                         goto start;
 837                         }
 838
 839                 /* else we have a handshake */
 840                 if ((rr->type == SSL3_RT_HANDSHAKE) &&
 841                         !s->in_handshake)
 842                         {
 843                         if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
 844                                 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
 845                                 {
 846                                 s->state=SSL_ST_BEFORE;
 847                                 s->new_session=1;
 848                                 }
 849                         n=s->handshake_func(s);
 850                         if (n < 0) return(n);
 851                         if (n == 0)
 852                                 {
 853                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 854                                 return(-1);
 855                                 }
 856                         goto start;
 857                         }
 858
 859                 al=SSL3_AD_UNEXPECTED_MESSAGE;
 860                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
 861                 goto f_err;
 862                 }
 863
 864         /* make sure that we are not getting application data when we
 865          * are doing a handshake for the first time */
 866         if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
 867                 (s->enc_read_ctx == NULL))
 868                 {
 869                 al=SSL3_AD_UNEXPECTED_MESSAGE;
 870                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
 871                 goto f_err;
 872                 }
 873
 874         if (len <= 0) return(len);
 875
 876         if ((unsigned int)len > rr->length)
 877                 n=rr->length;
 878         else
 879                 n=len;
 880
 881         memcpy(buf,&(rr->data[rr->off]),(unsigned int)n);
 882         rr->length-=n;
 883         rr->off+=n;
 884         if (rr->length <= 0)
 885                 s->rstate=SSL_ST_READ_HEADER;
 886
 887         if (type == SSL3_RT_HANDSHAKE)
 888                 ssl3_finish_mac(s,(unsigned char *)buf,n);
 889         return(n);
 890 f_err:
 891         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 892 err:
 893         return(-1);
 894         }
 895
 896 int ssl3_do_write(s,type)
 897 SSL *s;
 898 int type;
 899         {
 900         int ret;
 901
 902         ret=ssl3_write_bytes(s,type,(char *)
 903                 &(s->init_buf->data[s->init_off]),s->init_num);
 904         if (ret == s->init_num)
 905                 return(1);
 906         if (ret < 0) return(-1);
 907         s->init_off+=ret;
 908         s->init_num-=ret;
 909         return(0);
 910         }
 911
 912 void ssl3_send_alert(s,level,desc)
 913 SSL *s;
 914 int level;
 915 int desc;
 916         {
 917         /* If a fatal one, remove from cache */
 918         if ((level == 2) && (s->session != NULL))
 919                 SSL_CTX_remove_session(s->ctx,s->session);
 920
 921         s->s3->alert_dispatch=1;
 922         s->s3->send_alert[0]=level;
 923         s->s3->send_alert[1]=desc;
 924         if (s->s3->wbuf.left == 0) /* data still being written out */
 925                 ssl3_dispatch_alert(s);
 926         /* else data is still being written out, we will get written
 927          * some time in the future */
 928         }
 929
 930 int ssl3_dispatch_alert(s)
 931 SSL *s;
 932         {
 933         int i,j;
 934         void (*cb)()=NULL;
 935
 936         s->s3->alert_dispatch=0;
 937         i=do_ssl3_write(s,SSL3_RT_ALERT,&(s->s3->send_alert[0]),2);
 938         if (i <= 0)
 939                 {
 940                 s->s3->alert_dispatch=1;
 941                 }
 942         else
 943                 {
 944                 /* If it is important, send it now.  If the message
 945                  * does not get sent due to non-blocking IO, we will
 946                  * not worry too much. */
 947                 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
 948                         BIO_flush(s->wbio);
 949
 950                 if (s->info_callback != NULL)
 951                         cb=s->info_callback;
 952                 else if (s->ctx->info_callback != NULL)
 953                         cb=s->ctx->info_callback;
 954
 955                 if (cb != NULL)
 956                         {
 957                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
 958                         cb(s,SSL_CB_WRITE_ALERT,j);
 959                         }
 960                 }
 961         return(i);
 962         }
 963