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.]
64 /* SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_PEER_ERROR_NO_CIPHER);
65 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_PEER_ERROR_NO_CERTIFICATE);
66 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_PEER_ERROR_CERTIFICATE);
67 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE);
68 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_UNKNOWN_REMOTE_ERROR_TYPE);
72 static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend);
73 static int do_ssl_write(SSL *s, const char *buf, unsigned int len);
74 static int write_pending(SSL *s, const char *buf, unsigned int len);
75 static int ssl_mt_error(int n);
78 static int do_ssl_write();
79 static int write_pending();
80 static int ssl_mt_error();
83 int ssl2_peek(s,buf,len)
90 ret=ssl2_read(s,buf,len);
93 s->s2->ract_data_length+=ret;
94 s->s2->ract_data-=ret;
100 * This routine will return 0 to len bytes, decrypted etc if required.
102 int ssl2_read(s, buf, len)
108 unsigned char mac[MAX_MAC_SIZE];
111 unsigned int mac_size=0;
113 if (SSL_in_init(s) && !s->in_handshake)
115 n=s->handshake_func(s);
116 if (n < 0) return(n);
119 SSLerr(SSL_F_SSL2_READ,SSL_R_SSL_HANDSHAKE_FAILURE);
125 s->rwstate=SSL_NOTHING;
126 if (len <= 0) return(len);
128 if (s->s2->ract_data_length != 0) /* read from buffer */
130 if (len > s->s2->ract_data_length)
131 n=s->s2->ract_data_length;
135 memcpy(buf,s->s2->ract_data,(unsigned int)n);
136 s->s2->ract_data_length-=n;
138 if (s->s2->ract_data_length == 0)
139 s->rstate=SSL_ST_READ_HEADER;
143 if (s->rstate == SSL_ST_READ_HEADER)
147 n=read_n(s,5,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
148 if (n <= 0) return(n); /* error or non-blocking */
151 if (!((p[0] & 0x80) && (
152 (p[2] == SSL2_MT_CLIENT_HELLO) ||
153 (p[2] == SSL2_MT_SERVER_HELLO))))
155 SSLerr(SSL_F_SSL2_READ,SSL_R_NON_SSLV2_INITIAL_PACKET);
161 n=read_n(s,2,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
162 if (n <= 0) return(n); /* error or non-blocking */
164 /* part read stuff */
166 s->rstate=SSL_ST_READ_BODY;
169 /*s->s2->padding=0;*/
171 s->s2->rlength=(((unsigned int)p[0])<<8)|((unsigned int)p[1]);
172 if ((p[0] & TWO_BYTE_BIT)) /* Two byte header? */
174 s->s2->three_byte_header=0;
175 s->s2->rlength&=TWO_BYTE_MASK;
179 s->s2->three_byte_header=1;
180 s->s2->rlength&=THREE_BYTE_MASK;
182 /* security >s2->escape */
183 s->s2->escape=((p[0] & SEC_ESC_BIT))?1:0;
187 if (s->rstate == SSL_ST_READ_BODY)
189 n=s->s2->rlength+2+s->s2->three_byte_header;
190 if (n > (int)s->packet_length)
193 i=read_n(s,(unsigned int)n,(unsigned int)n,1);
194 if (i <= 0) return(i); /* ERROR */
198 s->rstate=SSL_ST_READ_HEADER;
199 if (s->s2->three_byte_header)
200 s->s2->padding= *(p++);
201 else s->s2->padding=0;
204 if (s->s2->clear_text)
208 s->s2->pad_data=NULL;
212 mac_size=EVP_MD_size(s->read_hash);
214 s->s2->ract_data= &p[mac_size];
215 s->s2->pad_data= &p[mac_size+
216 s->s2->rlength-s->s2->padding];
219 s->s2->ract_data_length=s->s2->rlength;
220 /* added a check for length > max_size in case
221 * encryption was not turned on yet due to an error */
222 if ((!s->s2->clear_text) &&
223 (s->s2->rlength >= mac_size))
226 s->s2->ract_data_length-=mac_size;
228 s->s2->ract_data_length-=s->s2->padding;
229 if ( (memcmp(mac,s->s2->mac_data,
230 (unsigned int)mac_size) != 0) ||
231 (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0))
233 SSLerr(SSL_F_SSL2_READ,SSL_R_BAD_MAC_DECODE);
237 INC32(s->s2->read_sequence); /* expect next number */
238 /* s->s2->ract_data is now available for processing */
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));
250 SSLerr(SSL_F_SSL2_READ,SSL_R_BAD_STATE);
255 static int read_n(s, n, max, extend)
263 /* if there is stuff still in the buffer from a previous read,
264 * and there is more than we want, take some. */
265 if (s->s2->rbuf_left >= (int)n)
271 s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]);
279 if (!s->read_ahead) max=n;
280 if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2))
281 max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2;
284 /* Else we want more than we have.
285 * First, if there is some left or we want to extend */
287 if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend))
289 newb=s->s2->rbuf_left;
292 off=s->packet_length;
293 if (s->packet != s->s2->rbuf)
294 memcpy(s->s2->rbuf,s->packet,
295 (unsigned int)newb+off);
297 else if (s->s2->rbuf_offs != 0)
299 memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]),
308 /* off is the offset to start writing too.
309 * r->s2->rbuf_offs is the 'unread data', now 0.
310 * newb is the number of new bytes so far
312 s->packet=s->s2->rbuf;
313 while (newb < (int)n)
318 s->rwstate=SSL_READING;
319 i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]),
324 SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET);
328 if (s->debug & 0x01) sleep(1);
332 s->s2->rbuf_left+=newb;
338 /* record unread data */
341 s->s2->rbuf_offs=n+off;
342 s->s2->rbuf_left=newb-n;
353 s->rwstate=SSL_NOTHING;
357 int ssl2_write(s, buf, len)
365 if (SSL_in_init(s) && !s->in_handshake)
367 i=s->handshake_func(s);
368 if (i < 0) return(i);
371 SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE);
384 s->rwstate=SSL_NOTHING;
385 if (len <= 0) return(len);
393 i=do_ssl_write(s,&(buf[tot]),n);
399 if (i == (int)n) return(tot+i);
406 static int write_pending(s,buf,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) || (s->s2->wpend_buf != buf))
419 SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
428 s->rwstate=SSL_WRITING;
430 (char *)&(s->s2->write_ptr[s->s2->wpend_off]),
431 (unsigned int)s->s2->wpend_len);
435 SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET);
439 if (s->debug & 0x01) sleep(1);
441 if (i == s->s2->wpend_len)
444 s->rwstate=SSL_NOTHING;
445 return(s->s2->wpend_ret);
454 static int do_ssl_write(s, buf, len)
459 unsigned int j,k,olen,p,mac_size,bs;
460 register unsigned char *pp;
464 /* first check if there is data from an encryption waiting to
465 * be sent - it must be sent because the other end is waiting.
466 * This will happen with non-blocking IO. We print it and then
469 if (s->s2->wpend_len != 0) return(write_pending(s,buf,len));
471 /* set mac_size to mac size */
472 if (s->s2->clear_text)
475 mac_size=EVP_MD_size(s->write_hash);
477 /* lets set the pad p */
478 if (s->s2->clear_text)
480 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
481 len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
483 s->s2->three_byte_header=0;
488 bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx);
490 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) &&
493 if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
494 j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
495 /* set k to the max number of bytes with 2
498 /* how many data bytes? */
500 s->s2->three_byte_header=0;
503 else if ((bs <= 1) && (!s->s2->escape))
506 s->s2->three_byte_header=0;
509 else /* 3 byte header */
515 s->s2->three_byte_header=1;
517 s->s2->three_byte_header=(p == 0)?0:1;
520 /* mac_size is the number of MAC bytes
521 * len is the number of data bytes we are going to send
522 * p is the number of padding bytes
523 * if p == 0, it is a 2 byte header */
527 s->s2->mac_data= &(s->s2->wbuf[3]);
528 s->s2->wact_data= &(s->s2->wbuf[3+mac_size]);
529 /* we copy the data into s->s2->wbuf */
530 memcpy(s->s2->wact_data,buf,len);
533 memset(&(s->s2->wact_data[len]),0,p);
536 if (!s->s2->clear_text)
538 s->s2->wact_data_length=len+p;
539 ssl2_mac(s,s->s2->mac_data,1);
540 s->s2->wlength+=p+mac_size;
544 /* package up the header */
545 s->s2->wpend_len=s->s2->wlength;
546 if (s->s2->three_byte_header) /* 3 byte header */
550 pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8);
551 if (s->s2->escape) pp[0]|=SEC_ESC_BIT;
552 pp[1]=s->s2->wlength&0xff;
553 pp[2]=s->s2->padding;
560 pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT;
561 pp[1]=s->s2->wlength&0xff;
566 INC32(s->s2->write_sequence); /* expect next number */
568 /* lets try to actually write the data */
569 s->s2->wpend_tot=olen;
570 s->s2->wpend_buf=buf;
572 s->s2->wpend_ret=len;
575 return(write_pending(s,buf,olen));
578 int ssl2_part_read(s,f,i)
586 /* check for error */
587 if ((s->init_num == 0) && (i >= 3))
589 p=(unsigned char *)s->init_buf->data;
590 if (p[0] == SSL2_MT_ERROR)
593 SSLerr((int)f,ssl_mt_error(j));
599 /* ssl2_return_error(s); */
600 /* for non-blocking io,
601 * this is not fatal */
616 ret=ssl2_write(s,(char *)&(s->init_buf->data[s->init_off]),
618 if (ret == s->init_num)
627 static int ssl_mt_error(n)
634 case SSL2_PE_NO_CIPHER:
635 ret=SSL_R_PEER_ERROR_NO_CIPHER;
637 case SSL2_PE_NO_CERTIFICATE:
638 ret=SSL_R_PEER_ERROR_NO_CERTIFICATE;
640 case SSL2_PE_BAD_CERTIFICATE:
641 ret=SSL_R_PEER_ERROR_CERTIFICATE;
643 case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE:
644 ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE;
647 ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE;