1 /* ssl/s23_srvr.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
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.
8 *
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).
15 *
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.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
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)"
40 *
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
51 * SUCH DAMAGE.
52 *
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.]
57 */
58 /* ====================================================================
59 * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
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
71 * distribution.
72 *
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/)"
77 *
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.
82 *
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.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
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 * ====================================================================
105 *
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).
109 *
110 */
111
112 #include <stdio.h>
113 #include "ssl_locl.h"
114 #include <openssl/buffer.h>
115 #include <openssl/rand.h>
116 #include <openssl/objects.h>
117 #include <openssl/evp.h>
118 #ifdef OPENSSL_FIPS
119 #include <openssl/fips.h>
120 #endif
121
122 static const SSL_METHOD *ssl23_get_server_method(int ver);
123 int ssl23_get_client_hello(SSL *s);
ssl23_get_server_method(int ver)124 static const SSL_METHOD *ssl23_get_server_method(int ver)
125 {
126 #ifndef OPENSSL_NO_SSL2
127 if (ver == SSL2_VERSION)
128 return(SSLv2_server_method());
129 #endif
130 if (ver == SSL3_VERSION)
131 return(SSLv3_server_method());
132 else if (ver == TLS1_VERSION)
133 return(TLSv1_server_method());
134 else if (ver == TLS1_1_VERSION)
135 return(TLSv1_1_server_method());
136 else if (ver == TLS1_2_VERSION)
137 return(TLSv1_2_server_method());
138 else
139 return(NULL);
140 }
141
IMPLEMENT_ssl23_meth_func(SSLv23_server_method,ssl23_accept,ssl_undefined_function,ssl23_get_server_method)142 IMPLEMENT_ssl23_meth_func(SSLv23_server_method,
143 ssl23_accept,
144 ssl_undefined_function,
145 ssl23_get_server_method)
146
147 int ssl23_accept(SSL *s)
148 {
149 BUF_MEM *buf;
150 unsigned long Time=(unsigned long)time(NULL);
151 void (*cb)(const SSL *ssl,int type,int val)=NULL;
152 int ret= -1;
153 int new_state,state;
154
155 RAND_add(&Time,sizeof(Time),0);
156 ERR_clear_error();
157 clear_sys_error();
158
159 if (s->info_callback != NULL)
160 cb=s->info_callback;
161 else if (s->ctx->info_callback != NULL)
162 cb=s->ctx->info_callback;
163
164 s->in_handshake++;
165 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
166
167 for (;;)
168 {
169 state=s->state;
170
171 switch(s->state)
172 {
173 case SSL_ST_BEFORE:
174 case SSL_ST_ACCEPT:
175 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
176 case SSL_ST_OK|SSL_ST_ACCEPT:
177
178 s->server=1;
179 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
180
181 /* s->version=SSL3_VERSION; */
182 s->type=SSL_ST_ACCEPT;
183
184 if (s->init_buf == NULL)
185 {
186 if ((buf=BUF_MEM_new()) == NULL)
187 {
188 ret= -1;
189 goto end;
190 }
191 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
192 {
193 ret= -1;
194 goto end;
195 }
196 s->init_buf=buf;
197 }
198
199 ssl3_init_finished_mac(s);
200
201 s->state=SSL23_ST_SR_CLNT_HELLO_A;
202 s->ctx->stats.sess_accept++;
203 s->init_num=0;
204 break;
205
206 case SSL23_ST_SR_CLNT_HELLO_A:
207 case SSL23_ST_SR_CLNT_HELLO_B:
208
209 s->shutdown=0;
210 ret=ssl23_get_client_hello(s);
211 if (ret >= 0) cb=NULL;
212 goto end;
213 /* break; */
214
215 default:
216 SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
217 ret= -1;
218 goto end;
219 /* break; */
220 }
221
222 if ((cb != NULL) && (s->state != state))
223 {
224 new_state=s->state;
225 s->state=state;
226 cb(s,SSL_CB_ACCEPT_LOOP,1);
227 s->state=new_state;
228 }
229 }
230 end:
231 s->in_handshake--;
232 if (cb != NULL)
233 cb(s,SSL_CB_ACCEPT_EXIT,ret);
234 return(ret);
235 }
236
237
ssl23_get_client_hello(SSL * s)238 int ssl23_get_client_hello(SSL *s)
239 {
240 char buf_space[11]; /* Request this many bytes in initial read.
241 * We can detect SSL 3.0/TLS 1.0 Client Hellos
242 * ('type == 3') correctly only when the following
243 * is in a single record, which is not guaranteed by
244 * the protocol specification:
245 * Byte Content
246 * 0 type \
247 * 1/2 version > record header
248 * 3/4 length /
249 * 5 msg_type \
250 * 6-8 length > Client Hello message
251 * 9/10 client_version /
252 */
253 char *buf= &(buf_space[0]);
254 unsigned char *p,*d,*d_len,*dd;
255 unsigned int i;
256 unsigned int csl,sil,cl;
257 int n=0,j;
258 int type=0;
259 int v[2];
260
261 if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
262 {
263 /* read the initial header */
264 v[0]=v[1]=0;
265
266 if (!ssl3_setup_buffers(s)) goto err;
267
268 n=ssl23_read_bytes(s, sizeof buf_space);
269 if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */
270
271 p=s->packet;
272
273 memcpy(buf,p,n);
274
275 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
276 {
277 /*
278 * SSLv2 header
279 */
280 if ((p[3] == 0x00) && (p[4] == 0x02))
281 {
282 v[0]=p[3]; v[1]=p[4];
283 /* SSLv2 */
284 if (!(s->options & SSL_OP_NO_SSLv2))
285 type=1;
286 }
287 else if (p[3] == SSL3_VERSION_MAJOR)
288 {
289 v[0]=p[3]; v[1]=p[4];
290 /* SSLv3/TLSv1 */
291 if (p[4] >= TLS1_VERSION_MINOR)
292 {
293 if (p[4] >= TLS1_2_VERSION_MINOR &&
294 !(s->options & SSL_OP_NO_TLSv1_2))
295 {
296 s->version=TLS1_2_VERSION;
297 s->state=SSL23_ST_SR_CLNT_HELLO_B;
298 }
299 else if (p[4] >= TLS1_1_VERSION_MINOR &&
300 !(s->options & SSL_OP_NO_TLSv1_1))
301 {
302 s->version=TLS1_1_VERSION;
303 /* type=2; */ /* done later to survive restarts */
304 s->state=SSL23_ST_SR_CLNT_HELLO_B;
305 }
306 else if (!(s->options & SSL_OP_NO_TLSv1))
307 {
308 s->version=TLS1_VERSION;
309 /* type=2; */ /* done later to survive restarts */
310 s->state=SSL23_ST_SR_CLNT_HELLO_B;
311 }
312 else if (!(s->options & SSL_OP_NO_SSLv3))
313 {
314 s->version=SSL3_VERSION;
315 /* type=2; */
316 s->state=SSL23_ST_SR_CLNT_HELLO_B;
317 }
318 else if (!(s->options & SSL_OP_NO_SSLv2))
319 {
320 type=1;
321 }
322 }
323 else if (!(s->options & SSL_OP_NO_SSLv3))
324 {
325 s->version=SSL3_VERSION;
326 /* type=2; */
327 s->state=SSL23_ST_SR_CLNT_HELLO_B;
328 }
329 else if (!(s->options & SSL_OP_NO_SSLv2))
330 type=1;
331
332 }
333 }
334 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
335 (p[1] == SSL3_VERSION_MAJOR) &&
336 (p[5] == SSL3_MT_CLIENT_HELLO) &&
337 ((p[3] == 0 && p[4] < 5 /* silly record length? */)
338 || (p[9] >= p[1])))
339 {
340 /*
341 * SSLv3 or tls1 header
342 */
343
344 v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */
345 /* We must look at client_version inside the Client Hello message
346 * to get the correct minor version.
347 * However if we have only a pathologically small fragment of the
348 * Client Hello message, this would be difficult, and we'd have
349 * to read more records to find out.
350 * No known SSL 3.0 client fragments ClientHello like this,
351 * so we simply assume TLS 1.0 to avoid protocol version downgrade
352 * attacks. */
353 if (p[3] == 0 && p[4] < 6)
354 {
355 #if 0
356 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
357 goto err;
358 #else
359 v[1] = TLS1_VERSION_MINOR;
360 #endif
361 }
362 /* if major version number > 3 set minor to a value
363 * which will use the highest version 3 we support.
364 * If TLS 2.0 ever appears we will need to revise
365 * this....
366 */
367 else if (p[9] > SSL3_VERSION_MAJOR)
368 v[1]=0xff;
369 else
370 v[1]=p[10]; /* minor version according to client_version */
371 if (v[1] >= TLS1_VERSION_MINOR)
372 {
373 if (v[1] >= TLS1_2_VERSION_MINOR &&
374 !(s->options & SSL_OP_NO_TLSv1_2))
375 {
376 s->version=TLS1_2_VERSION;
377 type=3;
378 }
379 else if (v[1] >= TLS1_1_VERSION_MINOR &&
380 !(s->options & SSL_OP_NO_TLSv1_1))
381 {
382 s->version=TLS1_1_VERSION;
383 type=3;
384 }
385 else if (!(s->options & SSL_OP_NO_TLSv1))
386 {
387 s->version=TLS1_VERSION;
388 type=3;
389 }
390 else if (!(s->options & SSL_OP_NO_SSLv3))
391 {
392 s->version=SSL3_VERSION;
393 type=3;
394 }
395 }
396 else
397 {
398 /* client requests SSL 3.0 */
399 if (!(s->options & SSL_OP_NO_SSLv3))
400 {
401 s->version=SSL3_VERSION;
402 type=3;
403 }
404 else if (!(s->options & SSL_OP_NO_TLSv1))
405 {
406 /* we won't be able to use TLS of course,
407 * but this will send an appropriate alert */
408 s->version=TLS1_VERSION;
409 type=3;
410 }
411 }
412 }
413 else if ((strncmp("GET ", (char *)p,4) == 0) ||
414 (strncmp("POST ",(char *)p,5) == 0) ||
415 (strncmp("HEAD ",(char *)p,5) == 0) ||
416 (strncmp("PUT ", (char *)p,4) == 0))
417 {
418 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
419 goto err;
420 }
421 else if (strncmp("CONNECT",(char *)p,7) == 0)
422 {
423 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
424 goto err;
425 }
426 }
427
428 #ifdef OPENSSL_FIPS
429 if (FIPS_mode() && (s->version < TLS1_VERSION))
430 {
431 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
432 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
433 goto err;
434 }
435 #endif
436
437 if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
438 {
439 /* we have SSLv3/TLSv1 in an SSLv2 header
440 * (other cases skip this state) */
441
442 type=2;
443 p=s->packet;
444 v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
445 v[1] = p[4];
446
447 n=((p[0]&0x7f)<<8)|p[1];
448 if (n > (1024*4))
449 {
450 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
451 goto err;
452 }
453
454 j=ssl23_read_bytes(s,n+2);
455 if (j <= 0) return(j);
456
457 ssl3_finish_mac(s, s->packet+2, s->packet_length-2);
458 if (s->msg_callback)
459 s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
460
461 p=s->packet;
462 p+=5;
463 n2s(p,csl);
464 n2s(p,sil);
465 n2s(p,cl);
466 d=(unsigned char *)s->init_buf->data;
467 if ((csl+sil+cl+11) != s->packet_length) /* We can't have TLS extensions in SSL 2.0 format
468 * Client Hello, can we? Error condition should be
469 * '>' otherweise */
470 {
471 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
472 goto err;
473 }
474
475 /* record header: msg_type ... */
476 *(d++) = SSL3_MT_CLIENT_HELLO;
477 /* ... and length (actual value will be written later) */
478 d_len = d;
479 d += 3;
480
481 /* client_version */
482 *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
483 *(d++) = v[1];
484
485 /* lets populate the random area */
486 /* get the challenge_length */
487 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
488 memset(d,0,SSL3_RANDOM_SIZE);
489 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
490 d+=SSL3_RANDOM_SIZE;
491
492 /* no session-id reuse */
493 *(d++)=0;
494
495 /* ciphers */
496 j=0;
497 dd=d;
498 d+=2;
499 for (i=0; i<csl; i+=3)
500 {
501 if (p[i] != 0) continue;
502 *(d++)=p[i+1];
503 *(d++)=p[i+2];
504 j+=2;
505 }
506 s2n(j,dd);
507
508 /* COMPRESSION */
509 *(d++)=1;
510 *(d++)=0;
511
512 #if 0
513 /* copy any remaining data with may be extensions */
514 p = p+csl+sil+cl;
515 while (p < s->packet+s->packet_length)
516 {
517 *(d++)=*(p++);
518 }
519 #endif
520
521 i = (d-(unsigned char *)s->init_buf->data) - 4;
522 l2n3((long)i, d_len);
523
524 /* get the data reused from the init_buf */
525 s->s3->tmp.reuse_message=1;
526 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
527 s->s3->tmp.message_size=i;
528 }
529
530 /* imaginary new state (for program structure): */
531 /* s->state = SSL23_SR_CLNT_HELLO_C */
532
533 if (type == 1)
534 {
535 #ifdef OPENSSL_NO_SSL2
536 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
537 goto err;
538 #else
539 /* we are talking sslv2 */
540 /* we need to clean up the SSLv3/TLSv1 setup and put in the
541 * sslv2 stuff. */
542
543 if (s->s2 == NULL)
544 {
545 if (!ssl2_new(s))
546 goto err;
547 }
548 else
549 ssl2_clear(s);
550
551 if (s->s3 != NULL) ssl3_free(s);
552
553 if (!BUF_MEM_grow_clean(s->init_buf,
554 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
555 {
556 goto err;
557 }
558
559 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
560 if (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3)
561 s->s2->ssl2_rollback=0;
562 else
563 /* reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0
564 * (SSL 3.0 draft/RFC 2246, App. E.2) */
565 s->s2->ssl2_rollback=1;
566
567 /* setup the n bytes we have read so we get them from
568 * the sslv2 buffer */
569 s->rstate=SSL_ST_READ_HEADER;
570 s->packet_length=n;
571 s->packet= &(s->s2->rbuf[0]);
572 memcpy(s->packet,buf,n);
573 s->s2->rbuf_left=n;
574 s->s2->rbuf_offs=0;
575
576 s->method=SSLv2_server_method();
577 s->handshake_func=s->method->ssl_accept;
578 #endif
579 }
580
581 if ((type == 2) || (type == 3))
582 {
583 /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
584
585 if (!ssl_init_wbio_buffer(s,1)) goto err;
586
587 /* we are in this state */
588 s->state=SSL3_ST_SR_CLNT_HELLO_A;
589
590 if (type == 3)
591 {
592 /* put the 'n' bytes we have read into the input buffer
593 * for SSLv3 */
594 s->rstate=SSL_ST_READ_HEADER;
595 s->packet_length=n;
596 if (s->s3->rbuf.buf == NULL)
597 if (!ssl3_setup_read_buffer(s))
598 goto err;
599
600 s->packet= &(s->s3->rbuf.buf[0]);
601 memcpy(s->packet,buf,n);
602 s->s3->rbuf.left=n;
603 s->s3->rbuf.offset=0;
604 }
605 else
606 {
607 s->packet_length=0;
608 s->s3->rbuf.left=0;
609 s->s3->rbuf.offset=0;
610 }
611 if (s->version == TLS1_2_VERSION)
612 s->method = TLSv1_2_server_method();
613 else if (s->version == TLS1_1_VERSION)
614 s->method = TLSv1_1_server_method();
615 else if (s->version == TLS1_VERSION)
616 s->method = TLSv1_server_method();
617 else
618 s->method = SSLv3_server_method();
619 #if 0 /* ssl3_get_client_hello does this */
620 s->client_version=(v[0]<<8)|v[1];
621 #endif
622 s->handshake_func=s->method->ssl_accept;
623 }
624
625 if ((type < 1) || (type > 3))
626 {
627 /* bad, very bad */
628 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
629 goto err;
630 }
631 s->init_num=0;
632
633 if (buf != buf_space) OPENSSL_free(buf);
634 return(SSL_accept(s));
635 err:
636 if (buf != buf_space) OPENSSL_free(buf);
637 return(-1);
638 }
639