2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
58 /* ====================================================================
59 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
87 * 6. Redistributions of any form whatsoever must retain the following
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * ====================================================================
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).
112 #include "ssl_locl.h"
113 #ifndef OPENSSL_NO_SSL2
118 static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend);
119 static int 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);
124 /* SSL 2.0 imlementation for SSL_read/SSL_peek -
125 * This routine will return 0 to len bytes, decrypted etc if required.
127 static int ssl2_read_internal(SSL *s, void *buf, int len, int peek)
130 unsigned char mac[MAX_MAC_SIZE];
133 unsigned int mac_size;
136 if (SSL_in_init(s) && !s->in_handshake)
138 n=s->handshake_func(s);
139 if (n < 0) return(n);
142 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_SSL_HANDSHAKE_FAILURE);
148 s->rwstate=SSL_NOTHING;
149 if (len <= 0) return(len);
151 if (s->s2->ract_data_length != 0) /* read from buffer */
153 if (len > s->s2->ract_data_length)
154 n=s->s2->ract_data_length;
158 memcpy(buf,s->s2->ract_data,(unsigned int)n);
161 s->s2->ract_data_length-=n;
163 if (s->s2->ract_data_length == 0)
164 s->rstate=SSL_ST_READ_HEADER;
170 /* s->s2->ract_data_length == 0
172 * Fill the buffer, then goto ssl2_read_again.
175 if (s->rstate == SSL_ST_READ_HEADER)
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 */
183 if (!((p[0] & 0x80) && (
184 (p[2] == SSL2_MT_CLIENT_HELLO) ||
185 (p[2] == SSL2_MT_SERVER_HELLO))))
187 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_NON_SSLV2_INITIAL_PACKET);
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 */
196 /* part read stuff */
198 s->rstate=SSL_ST_READ_BODY;
201 /*s->s2->padding=0;*/
203 s->s2->rlength=(((unsigned int)p[0])<<8)|((unsigned int)p[1]);
204 if ((p[0] & TWO_BYTE_BIT)) /* Two byte header? */
206 s->s2->three_byte_header=0;
207 s->s2->rlength&=TWO_BYTE_MASK;
211 s->s2->three_byte_header=1;
212 s->s2->rlength&=THREE_BYTE_MASK;
214 /* security >s2->escape */
215 s->s2->escape=((p[0] & SEC_ESC_BIT))?1:0;
219 if (s->rstate == SSL_ST_READ_BODY)
221 n=s->s2->rlength+2+s->s2->three_byte_header;
222 if (n > (int)s->packet_length)
225 i=read_n(s,(unsigned int)n,(unsigned int)n,1);
226 if (i <= 0) return(i); /* ERROR */
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;
236 if (s->s2->clear_text)
243 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING);
249 mac_size=EVP_MD_size(s->read_hash);
251 s->s2->ract_data= &p[mac_size];
252 if (s->s2->padding + mac_size > s->s2->rlength)
254 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING);
259 s->s2->ract_data_length=s->s2->rlength;
260 /* added a check for length > max_size in case
261 * encryption was not turned on yet due to an error */
262 if ((!s->s2->clear_text) &&
263 (s->s2->rlength >= mac_size))
266 s->s2->ract_data_length-=mac_size;
268 s->s2->ract_data_length-=s->s2->padding;
269 if ( (memcmp(mac,s->s2->mac_data,
270 (unsigned int)mac_size) != 0) ||
271 (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0))
273 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_MAC_DECODE);
277 INC32(s->s2->read_sequence); /* expect next number */
278 /* s->s2->ract_data is now available for processing */
280 /* Possibly the packet that we just read had 0 actual data bytes.
281 * (SSLeay/OpenSSL itself never sends such packets; see ssl2_write.)
282 * In this case, returning 0 would be interpreted by the caller
283 * as indicating EOF, so it's not a good idea. Instead, we just
284 * continue reading; thus ssl2_read_internal may have to process
285 * multiple packets before it can return.
287 * [Note that using select() for blocking sockets *never* guarantees
288 * that the next SSL_read will not block -- the available
289 * data may contain incomplete packets, and except for SSL 2,
290 * renegotiation can confuse things even more.] */
292 goto ssl2_read_again; /* This should really be
293 * "return ssl2_read(s,buf,len)",
294 * but that would allow for
295 * denial-of-service attacks if a
296 * C compiler is used that does not
297 * recognize end-recursion. */
301 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_STATE);
306 int ssl2_read(SSL *s, void *buf, int len)
308 return ssl2_read_internal(s, buf, len, 0);
311 int ssl2_peek(SSL *s, void *buf, int len)
313 return ssl2_read_internal(s, buf, len, 1);
316 static int read_n(SSL *s, unsigned int n, unsigned int max,
321 /* if there is stuff still in the buffer from a previous read,
322 * and there is more than we want, take some. */
323 if (s->s2->rbuf_left >= (int)n)
329 s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]);
337 if (!s->read_ahead) max=n;
338 if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2))
339 max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2;
342 /* Else we want more than we have.
343 * First, if there is some left or we want to extend */
345 if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend))
347 newb=s->s2->rbuf_left;
350 off=s->packet_length;
351 if (s->packet != s->s2->rbuf)
352 memcpy(s->s2->rbuf,s->packet,
353 (unsigned int)newb+off);
355 else if (s->s2->rbuf_offs != 0)
357 memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]),
366 /* off is the offset to start writing too.
367 * r->s2->rbuf_offs is the 'unread data', now 0.
368 * newb is the number of new bytes so far
370 s->packet=s->s2->rbuf;
371 while (newb < (int)n)
376 s->rwstate=SSL_READING;
377 i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]),
382 SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET);
386 if (s->debug & 0x01) sleep(1);
390 s->s2->rbuf_left+=newb;
396 /* record unread data */
399 s->s2->rbuf_offs=n+off;
400 s->s2->rbuf_left=newb-n;
411 s->rwstate=SSL_NOTHING;
415 int ssl2_write(SSL *s, const void *_buf, int len)
417 const unsigned char *buf=_buf;
421 if (SSL_in_init(s) && !s->in_handshake)
423 i=s->handshake_func(s);
424 if (i < 0) return(i);
427 SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE);
440 s->rwstate=SSL_NOTHING;
441 if (len <= 0) return(len);
449 i=do_ssl_write(s,&(buf[tot]),n);
456 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))
466 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len)
470 /* s->s2->wpend_len != 0 MUST be true. */
472 /* check that they have given us the same buffer to
474 if ((s->s2->wpend_tot > (int)len) ||
475 ((s->s2->wpend_buf != buf) &&
476 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)))
478 SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
487 s->rwstate=SSL_WRITING;
489 (char *)&(s->s2->write_ptr[s->s2->wpend_off]),
490 (unsigned int)s->s2->wpend_len);
494 SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET);
498 if (s->debug & 0x01) sleep(1);
500 if (i == s->s2->wpend_len)
503 s->rwstate=SSL_NOTHING;
504 return(s->s2->wpend_ret);
513 static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len)
515 unsigned int j,k,olen,p,mac_size,bs;
516 register unsigned char *pp;
520 /* first check if there is data from an encryption waiting to
521 * be sent - it must be sent because the other end is waiting.
522 * This will happen with non-blocking IO. We print it and then
525 if (s->s2->wpend_len != 0) return(write_pending(s,buf,len));
527 /* set mac_size to mac size */
528 if (s->s2->clear_text)
531 mac_size=EVP_MD_size(s->write_hash);
533 /* lets set the pad p */
534 if (s->s2->clear_text)
536 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
537 len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
539 s->s2->three_byte_header=0;
544 bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx);
546 /* Two-byte headers allow for a larger record length than
547 * three-byte headers, but we can't use them if we need
548 * padding or if we have to set the escape bit. */
549 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) &&
552 if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
553 j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
554 /* set k to the max number of bytes with 2
557 /* how many data bytes? */
559 s->s2->three_byte_header=0;
562 else if ((bs <= 1) && (!s->s2->escape))
564 /* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus
565 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER */
566 s->s2->three_byte_header=0;
569 else /* we may have to use a 3 byte header */
571 /* If s->s2->escape is not set, then
572 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus
573 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. */
578 s->s2->three_byte_header=1;
579 if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
580 j=SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER;
583 s->s2->three_byte_header=(p == 0)?0:1;
588 * j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER
589 * holds, and if s->s2->three_byte_header is set, then even
590 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER.
593 /* mac_size is the number of MAC bytes
594 * len is the number of data bytes we are going to send
595 * p is the number of padding bytes
596 * (if it is a two-byte header, then p == 0) */
600 s->s2->mac_data= &(s->s2->wbuf[3]);
601 s->s2->wact_data= &(s->s2->wbuf[3+mac_size]);
602 /* we copy the data into s->s2->wbuf */
603 memcpy(s->s2->wact_data,buf,len);
605 memset(&(s->s2->wact_data[len]),0,p); /* arbitrary padding */
607 if (!s->s2->clear_text)
609 s->s2->wact_data_length=len+p;
610 ssl2_mac(s,s->s2->mac_data,1);
611 s->s2->wlength+=p+mac_size;
615 /* package up the header */
616 s->s2->wpend_len=s->s2->wlength;
617 if (s->s2->three_byte_header) /* 3 byte header */
621 pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8);
622 if (s->s2->escape) pp[0]|=SEC_ESC_BIT;
623 pp[1]=s->s2->wlength&0xff;
624 pp[2]=s->s2->padding;
631 pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT;
632 pp[1]=s->s2->wlength&0xff;
637 INC32(s->s2->write_sequence); /* expect next number */
639 /* lets try to actually write the data */
640 s->s2->wpend_tot=olen;
641 s->s2->wpend_buf=buf;
643 s->s2->wpend_ret=len;
646 return(write_pending(s,buf,olen));
649 int ssl2_part_read(SSL *s, unsigned long f, int i)
656 /* ssl2_return_error(s); */
657 /* for non-blocking io,
658 * this is not necessarily fatal */
665 /* Check for error. While there are recoverable errors,
666 * this function is not called when those must be expected;
667 * any error detected here is fatal. */
668 if (s->init_num >= 3)
670 p=(unsigned char *)s->init_buf->data;
671 if (p[0] == SSL2_MT_ERROR)
674 SSLerr((int)f,ssl_mt_error(j));
677 memmove(p, p+3, s->init_num);
681 /* If it's not an error message, we have some error anyway --
682 * the message was shorter than expected. This too is treated
683 * as fatal (at least if SSL_get_error is asked for its opinion). */
688 int ssl2_do_write(SSL *s)
692 ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num);
693 if (ret == s->init_num)
696 s->msg_callback(1, s->version, 0, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg);
706 static int ssl_mt_error(int n)
712 case SSL2_PE_NO_CIPHER:
713 ret=SSL_R_PEER_ERROR_NO_CIPHER;
715 case SSL2_PE_NO_CERTIFICATE:
716 ret=SSL_R_PEER_ERROR_NO_CERTIFICATE;
718 case SSL2_PE_BAD_CERTIFICATE:
719 ret=SSL_R_PEER_ERROR_CERTIFICATE;
721 case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE:
722 ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE;
725 ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE;
730 #else /* !OPENSSL_NO_SSL2 */
733 static void *dummy=&dummy;