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.]
68 static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend);
69 static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len);
70 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len);
71 static int ssl_mt_error(int n);
72 int ssl2_peek(SSL *s, char *buf, int len)
76 ret=ssl2_read(s,buf,len);
79 s->s2->ract_data_length+=ret;
80 s->s2->ract_data-=ret;
86 * This routine will return 0 to len bytes, decrypted etc if required.
88 int ssl2_read(SSL *s, void *buf, int len)
91 unsigned char mac[MAX_MAC_SIZE];
94 unsigned int mac_size=0;
97 if (SSL_in_init(s) && !s->in_handshake)
99 n=s->handshake_func(s);
100 if (n < 0) return(n);
103 SSLerr(SSL_F_SSL2_READ,SSL_R_SSL_HANDSHAKE_FAILURE);
109 s->rwstate=SSL_NOTHING;
110 if (len <= 0) return(len);
112 if (s->s2->ract_data_length != 0) /* read from buffer */
114 if (len > s->s2->ract_data_length)
115 n=s->s2->ract_data_length;
119 memcpy(buf,s->s2->ract_data,(unsigned int)n);
120 s->s2->ract_data_length-=n;
122 if (s->s2->ract_data_length == 0)
123 s->rstate=SSL_ST_READ_HEADER;
127 if (s->rstate == SSL_ST_READ_HEADER)
131 n=read_n(s,5,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
132 if (n <= 0) return(n); /* error or non-blocking */
135 if (!((p[0] & 0x80) && (
136 (p[2] == SSL2_MT_CLIENT_HELLO) ||
137 (p[2] == SSL2_MT_SERVER_HELLO))))
139 SSLerr(SSL_F_SSL2_READ,SSL_R_NON_SSLV2_INITIAL_PACKET);
145 n=read_n(s,2,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
146 if (n <= 0) return(n); /* error or non-blocking */
148 /* part read stuff */
150 s->rstate=SSL_ST_READ_BODY;
153 /*s->s2->padding=0;*/
155 s->s2->rlength=(((unsigned int)p[0])<<8)|((unsigned int)p[1]);
156 if ((p[0] & TWO_BYTE_BIT)) /* Two byte header? */
158 s->s2->three_byte_header=0;
159 s->s2->rlength&=TWO_BYTE_MASK;
163 s->s2->three_byte_header=1;
164 s->s2->rlength&=THREE_BYTE_MASK;
166 /* security >s2->escape */
167 s->s2->escape=((p[0] & SEC_ESC_BIT))?1:0;
171 if (s->rstate == SSL_ST_READ_BODY)
173 n=s->s2->rlength+2+s->s2->three_byte_header;
174 if (n > (int)s->packet_length)
177 i=read_n(s,(unsigned int)n,(unsigned int)n,1);
178 if (i <= 0) return(i); /* ERROR */
182 s->rstate=SSL_ST_READ_HEADER;
183 if (s->s2->three_byte_header)
184 s->s2->padding= *(p++);
185 else s->s2->padding=0;
188 if (s->s2->clear_text)
192 s->s2->pad_data=NULL;
196 mac_size=EVP_MD_size(s->read_hash);
198 s->s2->ract_data= &p[mac_size];
199 s->s2->pad_data= &p[mac_size+
200 s->s2->rlength-s->s2->padding];
203 s->s2->ract_data_length=s->s2->rlength;
204 /* added a check for length > max_size in case
205 * encryption was not turned on yet due to an error */
206 if ((!s->s2->clear_text) &&
207 (s->s2->rlength >= mac_size))
210 s->s2->ract_data_length-=mac_size;
212 s->s2->ract_data_length-=s->s2->padding;
213 if ( (memcmp(mac,s->s2->mac_data,
214 (unsigned int)mac_size) != 0) ||
215 (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0))
217 SSLerr(SSL_F_SSL2_READ,SSL_R_BAD_MAC_DECODE);
221 INC32(s->s2->read_sequence); /* expect next number */
222 /* s->s2->ract_data is now available for processing */
225 /* How should we react when a packet containing 0
226 * bytes is received? (Note that SSLeay/OpenSSL itself
227 * never sends such packets; see ssl2_write.)
228 * Returning 0 would be interpreted by the caller as
229 * indicating EOF, so it's not a good idea.
230 * Instead, we just continue reading. Note that using
231 * select() for blocking sockets *never* guarantees
232 * that the next SSL_read will not block -- the available
233 * data may contain incomplete packets, and except for SSL 2
234 * renegotiation can confuse things even more. */
236 goto ssl2_read_again; /* This should really be
237 * "return ssl2_read(s,buf,len)",
238 * but that would allow for
239 * denial-of-service attacks if a
240 * C compiler is used that does not
241 * recognize end-recursion. */
243 /* If a 0 byte packet was sent, return 0, otherwise
244 * we play havoc with people using select with
245 * blocking sockets. Let them handle a packet at a time,
246 * they should really be using non-blocking sockets. */
247 if (s->s2->ract_data_length == 0)
249 return(ssl2_read(s,buf,len));
254 SSLerr(SSL_F_SSL2_READ,SSL_R_BAD_STATE);
259 static int read_n(SSL *s, unsigned int n, unsigned int max,
264 /* if there is stuff still in the buffer from a previous read,
265 * and there is more than we want, take some. */
266 if (s->s2->rbuf_left >= (int)n)
272 s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]);
280 if (!s->read_ahead) max=n;
281 if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2))
282 max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2;
285 /* Else we want more than we have.
286 * First, if there is some left or we want to extend */
288 if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend))
290 newb=s->s2->rbuf_left;
293 off=s->packet_length;
294 if (s->packet != s->s2->rbuf)
295 memcpy(s->s2->rbuf,s->packet,
296 (unsigned int)newb+off);
298 else if (s->s2->rbuf_offs != 0)
300 memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]),
309 /* off is the offset to start writing too.
310 * r->s2->rbuf_offs is the 'unread data', now 0.
311 * newb is the number of new bytes so far
313 s->packet=s->s2->rbuf;
314 while (newb < (int)n)
319 s->rwstate=SSL_READING;
320 i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]),
325 SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET);
329 if (s->debug & 0x01) sleep(1);
333 s->s2->rbuf_left+=newb;
339 /* record unread data */
342 s->s2->rbuf_offs=n+off;
343 s->s2->rbuf_left=newb-n;
354 s->rwstate=SSL_NOTHING;
358 int ssl2_write(SSL *s, const void *_buf, int len)
360 const unsigned char *buf=_buf;
364 if (SSL_in_init(s) && !s->in_handshake)
366 i=s->handshake_func(s);
367 if (i < 0) return(i);
370 SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE);
383 s->rwstate=SSL_NOTHING;
384 if (len <= 0) return(len);
392 i=do_ssl_write(s,&(buf[tot]),n);
399 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))
409 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len)
413 /* s->s2->wpend_len != 0 MUST be true. */
415 /* check that they have given us the same buffer to
417 if ((s->s2->wpend_tot > (int)len) ||
418 ((s->s2->wpend_buf != buf) &&
419 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)))
421 SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
430 s->rwstate=SSL_WRITING;
432 (char *)&(s->s2->write_ptr[s->s2->wpend_off]),
433 (unsigned int)s->s2->wpend_len);
437 SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET);
441 if (s->debug & 0x01) sleep(1);
443 if (i == s->s2->wpend_len)
446 s->rwstate=SSL_NOTHING;
447 return(s->s2->wpend_ret);
456 static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len)
458 unsigned int j,k,olen,p,mac_size,bs;
459 register unsigned char *pp;
463 /* first check if there is data from an encryption waiting to
464 * be sent - it must be sent because the other end is waiting.
465 * This will happen with non-blocking IO. We print it and then
468 if (s->s2->wpend_len != 0) return(write_pending(s,buf,len));
470 /* set mac_size to mac size */
471 if (s->s2->clear_text)
474 mac_size=EVP_MD_size(s->write_hash);
476 /* lets set the pad p */
477 if (s->s2->clear_text)
479 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
480 len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
482 s->s2->three_byte_header=0;
487 bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx);
489 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) &&
492 if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
493 j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
494 /* set k to the max number of bytes with 2
497 /* how many data bytes? */
499 s->s2->three_byte_header=0;
502 else if ((bs <= 1) && (!s->s2->escape))
505 s->s2->three_byte_header=0;
508 else /* 3 byte header */
514 s->s2->three_byte_header=1;
516 s->s2->three_byte_header=(p == 0)?0:1;
519 /* mac_size is the number of MAC bytes
520 * len is the number of data bytes we are going to send
521 * p is the number of padding bytes
522 * if p == 0, it is a 2 byte header */
526 s->s2->mac_data= &(s->s2->wbuf[3]);
527 s->s2->wact_data= &(s->s2->wbuf[3+mac_size]);
528 /* we copy the data into s->s2->wbuf */
529 memcpy(s->s2->wact_data,buf,len);
532 memset(&(s->s2->wact_data[len]),0,p);
535 if (!s->s2->clear_text)
537 s->s2->wact_data_length=len+p;
538 ssl2_mac(s,s->s2->mac_data,1);
539 s->s2->wlength+=p+mac_size;
543 /* package up the header */
544 s->s2->wpend_len=s->s2->wlength;
545 if (s->s2->three_byte_header) /* 3 byte header */
549 pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8);
550 if (s->s2->escape) pp[0]|=SEC_ESC_BIT;
551 pp[1]=s->s2->wlength&0xff;
552 pp[2]=s->s2->padding;
559 pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT;
560 pp[1]=s->s2->wlength&0xff;
565 INC32(s->s2->write_sequence); /* expect next number */
567 /* lets try to actually write the data */
568 s->s2->wpend_tot=olen;
569 s->s2->wpend_buf=buf;
571 s->s2->wpend_ret=len;
574 return(write_pending(s,buf,olen));
577 int ssl2_part_read(SSL *s, unsigned long f, int i)
582 /* check for error */
583 if ((s->init_num == 0) && (i >= 3))
585 p=(unsigned char *)s->init_buf->data;
586 if (p[0] == SSL2_MT_ERROR)
589 SSLerr((int)f,ssl_mt_error(j));
595 /* ssl2_return_error(s); */
596 /* for non-blocking io,
597 * this is not fatal */
607 int ssl2_do_write(SSL *s)
611 ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num);
612 if (ret == s->init_num)
621 static int ssl_mt_error(int n)
627 case SSL2_PE_NO_CIPHER:
628 ret=SSL_R_PEER_ERROR_NO_CIPHER;
630 case SSL2_PE_NO_CERTIFICATE:
631 ret=SSL_R_PEER_ERROR_NO_CERTIFICATE;
633 case SSL2_PE_BAD_CERTIFICATE:
634 ret=SSL_R_PEER_ERROR_CERTIFICATE;
636 case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE:
637 ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE;
640 ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE;