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) 1998-2000 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=0;
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)
240 s->s2->pad_data=NULL;
244 mac_size=EVP_MD_size(s->read_hash);
246 s->s2->ract_data= &p[mac_size];
247 s->s2->pad_data= &p[mac_size+
248 s->s2->rlength-s->s2->padding];
251 s->s2->ract_data_length=s->s2->rlength;
252 /* added a check for length > max_size in case
253 * encryption was not turned on yet due to an error */
254 if ((!s->s2->clear_text) &&
255 (s->s2->rlength >= mac_size))
258 s->s2->ract_data_length-=mac_size;
260 s->s2->ract_data_length-=s->s2->padding;
261 if ( (memcmp(mac,s->s2->mac_data,
262 (unsigned int)mac_size) != 0) ||
263 (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0))
265 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_MAC_DECODE);
269 INC32(s->s2->read_sequence); /* expect next number */
270 /* s->s2->ract_data is now available for processing */
272 /* Possibly the packet that we just read had 0 actual data bytes.
273 * (SSLeay/OpenSSL itself never sends such packets; see ssl2_write.)
274 * In this case, returning 0 would be interpreted by the caller
275 * as indicating EOF, so it's not a good idea. Instead, we just
276 * continue reading; thus ssl2_read_internal may have to process
277 * multiple packets before it can return.
279 * [Note that using select() for blocking sockets *never* guarantees
280 * that the next SSL_read will not block -- the available
281 * data may contain incomplete packets, and except for SSL 2,
282 * renegotiation can confuse things even more.] */
284 goto ssl2_read_again; /* This should really be
285 * "return ssl2_read(s,buf,len)",
286 * but that would allow for
287 * denial-of-service attacks if a
288 * C compiler is used that does not
289 * recognize end-recursion. */
293 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_STATE);
298 int ssl2_read(SSL *s, void *buf, int len)
300 return ssl2_read_internal(s, buf, len, 0);
303 int ssl2_peek(SSL *s, char *buf, int len)
305 return ssl2_read_internal(s, buf, len, 1);
308 static int read_n(SSL *s, unsigned int n, unsigned int max,
313 /* if there is stuff still in the buffer from a previous read,
314 * and there is more than we want, take some. */
315 if (s->s2->rbuf_left >= (int)n)
321 s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]);
329 if (!s->read_ahead) max=n;
330 if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2))
331 max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2;
334 /* Else we want more than we have.
335 * First, if there is some left or we want to extend */
337 if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend))
339 newb=s->s2->rbuf_left;
342 off=s->packet_length;
343 if (s->packet != s->s2->rbuf)
344 memcpy(s->s2->rbuf,s->packet,
345 (unsigned int)newb+off);
347 else if (s->s2->rbuf_offs != 0)
349 memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]),
358 /* off is the offset to start writing too.
359 * r->s2->rbuf_offs is the 'unread data', now 0.
360 * newb is the number of new bytes so far
362 s->packet=s->s2->rbuf;
363 while (newb < (int)n)
368 s->rwstate=SSL_READING;
369 i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]),
374 SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET);
378 if (s->debug & 0x01) sleep(1);
382 s->s2->rbuf_left+=newb;
388 /* record unread data */
391 s->s2->rbuf_offs=n+off;
392 s->s2->rbuf_left=newb-n;
403 s->rwstate=SSL_NOTHING;
407 int ssl2_write(SSL *s, const void *_buf, int len)
409 const unsigned char *buf=_buf;
413 if (SSL_in_init(s) && !s->in_handshake)
415 i=s->handshake_func(s);
416 if (i < 0) return(i);
419 SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE);
432 s->rwstate=SSL_NOTHING;
433 if (len <= 0) return(len);
441 i=do_ssl_write(s,&(buf[tot]),n);
448 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))
458 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len)
462 /* s->s2->wpend_len != 0 MUST be true. */
464 /* check that they have given us the same buffer to
466 if ((s->s2->wpend_tot > (int)len) ||
467 ((s->s2->wpend_buf != buf) &&
468 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)))
470 SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
479 s->rwstate=SSL_WRITING;
481 (char *)&(s->s2->write_ptr[s->s2->wpend_off]),
482 (unsigned int)s->s2->wpend_len);
486 SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET);
490 if (s->debug & 0x01) sleep(1);
492 if (i == s->s2->wpend_len)
495 s->rwstate=SSL_NOTHING;
496 return(s->s2->wpend_ret);
505 static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len)
507 unsigned int j,k,olen,p,mac_size,bs;
508 register unsigned char *pp;
512 /* first check if there is data from an encryption waiting to
513 * be sent - it must be sent because the other end is waiting.
514 * This will happen with non-blocking IO. We print it and then
517 if (s->s2->wpend_len != 0) return(write_pending(s,buf,len));
519 /* set mac_size to mac size */
520 if (s->s2->clear_text)
523 mac_size=EVP_MD_size(s->write_hash);
525 /* lets set the pad p */
526 if (s->s2->clear_text)
528 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
529 len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
531 s->s2->three_byte_header=0;
536 bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx);
538 /* Two-byte headers allow for a larger record length than
539 * three-byte headers, but we can't use them if we need
540 * padding or if we have to set the escape bit. */
541 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) &&
544 if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
545 j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
546 /* set k to the max number of bytes with 2
549 /* how many data bytes? */
551 s->s2->three_byte_header=0;
554 else if ((bs <= 1) && (!s->s2->escape))
556 /* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus
557 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER */
558 s->s2->three_byte_header=0;
561 else /* we may have to use a 3 byte header */
563 /* If s->s2->escape is not set, then
564 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus
565 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. */
570 s->s2->three_byte_header=1;
571 if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
572 j=SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER;
575 s->s2->three_byte_header=(p == 0)?0:1;
580 * j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER
581 * holds, and if s->s2->three_byte_header is set, then even
582 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER.
585 /* mac_size is the number of MAC bytes
586 * len is the number of data bytes we are going to send
587 * p is the number of padding bytes
588 * (if it is a two-byte header, then p == 0) */
592 s->s2->mac_data= &(s->s2->wbuf[3]);
593 s->s2->wact_data= &(s->s2->wbuf[3+mac_size]);
594 /* we copy the data into s->s2->wbuf */
595 memcpy(s->s2->wact_data,buf,len);
598 memset(&(s->s2->wact_data[len]),0,p);
601 if (!s->s2->clear_text)
603 s->s2->wact_data_length=len+p;
604 ssl2_mac(s,s->s2->mac_data,1);
605 s->s2->wlength+=p+mac_size;
609 /* package up the header */
610 s->s2->wpend_len=s->s2->wlength;
611 if (s->s2->three_byte_header) /* 3 byte header */
615 pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8);
616 if (s->s2->escape) pp[0]|=SEC_ESC_BIT;
617 pp[1]=s->s2->wlength&0xff;
618 pp[2]=s->s2->padding;
625 pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT;
626 pp[1]=s->s2->wlength&0xff;
631 INC32(s->s2->write_sequence); /* expect next number */
633 /* lets try to actually write the data */
634 s->s2->wpend_tot=olen;
635 s->s2->wpend_buf=buf;
637 s->s2->wpend_ret=len;
640 return(write_pending(s,buf,olen));
643 int ssl2_part_read(SSL *s, unsigned long f, int i)
648 /* check for error */
649 if ((s->init_num == 0) && (i >= 3))
651 p=(unsigned char *)s->init_buf->data;
652 if (p[0] == SSL2_MT_ERROR)
655 SSLerr((int)f,ssl_mt_error(j));
661 /* ssl2_return_error(s); */
662 /* for non-blocking io,
663 * this is not fatal */
673 int ssl2_do_write(SSL *s)
677 ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num);
678 if (ret == s->init_num)
687 static int ssl_mt_error(int n)
693 case SSL2_PE_NO_CIPHER:
694 ret=SSL_R_PEER_ERROR_NO_CIPHER;
696 case SSL2_PE_NO_CERTIFICATE:
697 ret=SSL_R_PEER_ERROR_NO_CERTIFICATE;
699 case SSL2_PE_BAD_CERTIFICATE:
700 ret=SSL_R_PEER_ERROR_CERTIFICATE;
702 case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE:
703 ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE;
706 ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE;
711 #else /* !OPENSSL_NO_SSL2 */
714 static void *dummy=&dummy;