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.]
65 static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend);
66 static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len);
67 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len);
68 static int ssl_mt_error(int n);
69 int ssl2_peek(SSL *s, char *buf, int len)
73 ret=ssl2_read(s,buf,len);
76 s->s2->ract_data_length+=ret;
77 s->s2->ract_data-=ret;
83 * This routine will return 0 to len bytes, decrypted etc if required.
85 int ssl2_read(SSL *s, void *buf, int len)
88 unsigned char mac[MAX_MAC_SIZE];
91 unsigned int mac_size=0;
94 if (SSL_in_init(s) && !s->in_handshake)
96 n=s->handshake_func(s);
100 SSLerr(SSL_F_SSL2_READ,SSL_R_SSL_HANDSHAKE_FAILURE);
106 s->rwstate=SSL_NOTHING;
107 if (len <= 0) return(len);
109 if (s->s2->ract_data_length != 0) /* read from buffer */
111 if (len > s->s2->ract_data_length)
112 n=s->s2->ract_data_length;
116 memcpy(buf,s->s2->ract_data,(unsigned int)n);
117 s->s2->ract_data_length-=n;
119 if (s->s2->ract_data_length == 0)
120 s->rstate=SSL_ST_READ_HEADER;
124 if (s->rstate == SSL_ST_READ_HEADER)
128 n=read_n(s,5,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
129 if (n <= 0) return(n); /* error or non-blocking */
132 if (!((p[0] & 0x80) && (
133 (p[2] == SSL2_MT_CLIENT_HELLO) ||
134 (p[2] == SSL2_MT_SERVER_HELLO))))
136 SSLerr(SSL_F_SSL2_READ,SSL_R_NON_SSLV2_INITIAL_PACKET);
142 n=read_n(s,2,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
143 if (n <= 0) return(n); /* error or non-blocking */
145 /* part read stuff */
147 s->rstate=SSL_ST_READ_BODY;
150 /*s->s2->padding=0;*/
152 s->s2->rlength=(((unsigned int)p[0])<<8)|((unsigned int)p[1]);
153 if ((p[0] & TWO_BYTE_BIT)) /* Two byte header? */
155 s->s2->three_byte_header=0;
156 s->s2->rlength&=TWO_BYTE_MASK;
160 s->s2->three_byte_header=1;
161 s->s2->rlength&=THREE_BYTE_MASK;
163 /* security >s2->escape */
164 s->s2->escape=((p[0] & SEC_ESC_BIT))?1:0;
168 if (s->rstate == SSL_ST_READ_BODY)
170 n=s->s2->rlength+2+s->s2->three_byte_header;
171 if (n > (int)s->packet_length)
174 i=read_n(s,(unsigned int)n,(unsigned int)n,1);
175 if (i <= 0) return(i); /* ERROR */
179 s->rstate=SSL_ST_READ_HEADER;
180 if (s->s2->three_byte_header)
181 s->s2->padding= *(p++);
182 else s->s2->padding=0;
185 if (s->s2->clear_text)
189 s->s2->pad_data=NULL;
193 mac_size=EVP_MD_size(s->read_hash);
195 s->s2->ract_data= &p[mac_size];
196 s->s2->pad_data= &p[mac_size+
197 s->s2->rlength-s->s2->padding];
200 s->s2->ract_data_length=s->s2->rlength;
201 /* added a check for length > max_size in case
202 * encryption was not turned on yet due to an error */
203 if ((!s->s2->clear_text) &&
204 (s->s2->rlength >= mac_size))
207 s->s2->ract_data_length-=mac_size;
209 s->s2->ract_data_length-=s->s2->padding;
210 if ( (memcmp(mac,s->s2->mac_data,
211 (unsigned int)mac_size) != 0) ||
212 (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0))
214 SSLerr(SSL_F_SSL2_READ,SSL_R_BAD_MAC_DECODE);
218 INC32(s->s2->read_sequence); /* expect next number */
219 /* s->s2->ract_data is now available for processing */
222 /* How should we react when a packet containing 0
223 * bytes is received? (Note that SSLeay/OpenSSL itself
224 * never sends such packets; see ssl2_write.)
225 * Returning 0 would be interpreted by the caller as
226 * indicating EOF, so it's not a good idea.
227 * Instead, we just continue reading. Note that using
228 * select() for blocking sockets *never* guarantees
229 * that the next SSL_read will not block -- the available
230 * data may contain incomplete packets, and except for SSL 2
231 * renegotiation can confuse things even more. */
233 goto ssl2_read_again; /* This should really be
234 * "return ssl2_read(s,buf,len)",
235 * but that would allow for
236 * denial-of-service attacks if a
237 * C compiler is used that does not
238 * recognize end-recursion. */
240 /* If a 0 byte packet was sent, return 0, otherwise
241 * we play havoc with people using select with
242 * blocking sockets. Let them handle a packet at a time,
243 * they should really be using non-blocking sockets. */
244 if (s->s2->ract_data_length == 0)
246 return(ssl2_read(s,buf,len));
251 SSLerr(SSL_F_SSL2_READ,SSL_R_BAD_STATE);
256 static int read_n(SSL *s, unsigned int n, unsigned int max,
261 /* if there is stuff still in the buffer from a previous read,
262 * and there is more than we want, take some. */
263 if (s->s2->rbuf_left >= (int)n)
269 s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]);
277 if (!s->read_ahead) max=n;
278 if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2))
279 max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2;
282 /* Else we want more than we have.
283 * First, if there is some left or we want to extend */
285 if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend))
287 newb=s->s2->rbuf_left;
290 off=s->packet_length;
291 if (s->packet != s->s2->rbuf)
292 memcpy(s->s2->rbuf,s->packet,
293 (unsigned int)newb+off);
295 else if (s->s2->rbuf_offs != 0)
297 memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]),
306 /* off is the offset to start writing too.
307 * r->s2->rbuf_offs is the 'unread data', now 0.
308 * newb is the number of new bytes so far
310 s->packet=s->s2->rbuf;
311 while (newb < (int)n)
316 s->rwstate=SSL_READING;
317 i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]),
322 SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET);
326 if (s->debug & 0x01) sleep(1);
330 s->s2->rbuf_left+=newb;
336 /* record unread data */
339 s->s2->rbuf_offs=n+off;
340 s->s2->rbuf_left=newb-n;
351 s->rwstate=SSL_NOTHING;
355 int ssl2_write(SSL *s, const void *_buf, int len)
357 const unsigned char *buf=_buf;
361 if (SSL_in_init(s) && !s->in_handshake)
363 i=s->handshake_func(s);
364 if (i < 0) return(i);
367 SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE);
380 s->rwstate=SSL_NOTHING;
381 if (len <= 0) return(len);
389 i=do_ssl_write(s,&(buf[tot]),n);
396 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))
406 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len)
410 /* s->s2->wpend_len != 0 MUST be true. */
412 /* check that they have given us the same buffer to
414 if ((s->s2->wpend_tot > (int)len) ||
415 ((s->s2->wpend_buf != buf) &&
416 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)))
418 SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
427 s->rwstate=SSL_WRITING;
429 (char *)&(s->s2->write_ptr[s->s2->wpend_off]),
430 (unsigned int)s->s2->wpend_len);
434 SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET);
438 if (s->debug & 0x01) sleep(1);
440 if (i == s->s2->wpend_len)
443 s->rwstate=SSL_NOTHING;
444 return(s->s2->wpend_ret);
453 static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len)
455 unsigned int j,k,olen,p,mac_size,bs;
456 register unsigned char *pp;
460 /* first check if there is data from an encryption waiting to
461 * be sent - it must be sent because the other end is waiting.
462 * This will happen with non-blocking IO. We print it and then
465 if (s->s2->wpend_len != 0) return(write_pending(s,buf,len));
467 /* set mac_size to mac size */
468 if (s->s2->clear_text)
471 mac_size=EVP_MD_size(s->write_hash);
473 /* lets set the pad p */
474 if (s->s2->clear_text)
476 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
477 len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
479 s->s2->three_byte_header=0;
484 bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx);
486 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) &&
489 if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
490 j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
491 /* set k to the max number of bytes with 2
494 /* how many data bytes? */
496 s->s2->three_byte_header=0;
499 else if ((bs <= 1) && (!s->s2->escape))
502 s->s2->three_byte_header=0;
505 else /* 3 byte header */
511 s->s2->three_byte_header=1;
513 s->s2->three_byte_header=(p == 0)?0:1;
516 /* mac_size is the number of MAC bytes
517 * len is the number of data bytes we are going to send
518 * p is the number of padding bytes
519 * if p == 0, it is a 2 byte header */
523 s->s2->mac_data= &(s->s2->wbuf[3]);
524 s->s2->wact_data= &(s->s2->wbuf[3+mac_size]);
525 /* we copy the data into s->s2->wbuf */
526 memcpy(s->s2->wact_data,buf,len);
529 memset(&(s->s2->wact_data[len]),0,p);
532 if (!s->s2->clear_text)
534 s->s2->wact_data_length=len+p;
535 ssl2_mac(s,s->s2->mac_data,1);
536 s->s2->wlength+=p+mac_size;
540 /* package up the header */
541 s->s2->wpend_len=s->s2->wlength;
542 if (s->s2->three_byte_header) /* 3 byte header */
546 pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8);
547 if (s->s2->escape) pp[0]|=SEC_ESC_BIT;
548 pp[1]=s->s2->wlength&0xff;
549 pp[2]=s->s2->padding;
556 pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT;
557 pp[1]=s->s2->wlength&0xff;
562 INC32(s->s2->write_sequence); /* expect next number */
564 /* lets try to actually write the data */
565 s->s2->wpend_tot=olen;
566 s->s2->wpend_buf=buf;
568 s->s2->wpend_ret=len;
571 return(write_pending(s,buf,olen));
574 int ssl2_part_read(SSL *s, unsigned long f, int i)
579 /* check for error */
580 if ((s->init_num == 0) && (i >= 3))
582 p=(unsigned char *)s->init_buf->data;
583 if (p[0] == SSL2_MT_ERROR)
586 SSLerr((int)f,ssl_mt_error(j));
592 /* ssl2_return_error(s); */
593 /* for non-blocking io,
594 * this is not fatal */
604 int ssl2_do_write(SSL *s)
608 ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num);
609 if (ret == s->init_num)
618 static int ssl_mt_error(int n)
624 case SSL2_PE_NO_CIPHER:
625 ret=SSL_R_PEER_ERROR_NO_CIPHER;
627 case SSL2_PE_NO_CERTIFICATE:
628 ret=SSL_R_PEER_ERROR_NO_CERTIFICATE;
630 case SSL2_PE_BAD_CERTIFICATE:
631 ret=SSL_R_PEER_ERROR_CERTIFICATE;
633 case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE:
634 ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE;
637 ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE;
645 static void *dummy=&dummy;