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d02b48c6 | 1 | /* ssl/s23_srvr.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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 | */ | |
a661b653 | 58 | /* ==================================================================== |
f1fd4544 | 59 | * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved. |
a661b653 BM |
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 | */ | |
d02b48c6 RE |
111 | |
112 | #include <stdio.h> | |
7b63c0fa | 113 | #include "ssl_locl.h" |
ec577822 BM |
114 | #include <openssl/buffer.h> |
115 | #include <openssl/rand.h> | |
116 | #include <openssl/objects.h> | |
117 | #include <openssl/evp.h> | |
7043fa70 DSH |
118 | #ifdef OPENSSL_FIPS |
119 | #include <openssl/fips.h> | |
120 | #endif | |
d02b48c6 | 121 | |
4ebb342f | 122 | static const SSL_METHOD *ssl23_get_server_method(int ver); |
d02b48c6 | 123 | int ssl23_get_client_hello(SSL *s); |
4ebb342f | 124 | static const SSL_METHOD *ssl23_get_server_method(int ver) |
d02b48c6 | 125 | { |
bc36ee62 | 126 | #ifndef OPENSSL_NO_SSL2 |
58964a49 | 127 | if (ver == SSL2_VERSION) |
d02b48c6 | 128 | return(SSLv2_server_method()); |
aa82db4f | 129 | #endif |
82180dcc | 130 | #ifndef OPENSSL_NO_SSL3 |
79df9d62 | 131 | if (ver == SSL3_VERSION) |
d02b48c6 | 132 | return(SSLv3_server_method()); |
82180dcc GT |
133 | #endif |
134 | if (ver == TLS1_VERSION) | |
58964a49 | 135 | return(TLSv1_server_method()); |
b4b15f68 DSH |
136 | else if (ver == TLS1_1_VERSION) |
137 | return(TLSv1_1_server_method()); | |
9472baae DSH |
138 | else if (ver == TLS1_2_VERSION) |
139 | return(TLSv1_2_server_method()); | |
d02b48c6 RE |
140 | else |
141 | return(NULL); | |
142 | } | |
143 | ||
f3b656b2 DSH |
144 | IMPLEMENT_ssl23_meth_func(SSLv23_server_method, |
145 | ssl23_accept, | |
146 | ssl_undefined_function, | |
147 | ssl23_get_server_method) | |
d02b48c6 | 148 | |
6b691a5c | 149 | int ssl23_accept(SSL *s) |
d02b48c6 RE |
150 | { |
151 | BUF_MEM *buf; | |
f1fd4544 | 152 | unsigned long Time=(unsigned long)time(NULL); |
45d87a1f | 153 | void (*cb)(const SSL *ssl,int type,int val)=NULL; |
d02b48c6 RE |
154 | int ret= -1; |
155 | int new_state,state; | |
156 | ||
eb952088 | 157 | RAND_add(&Time,sizeof(Time),0); |
d02b48c6 | 158 | ERR_clear_error(); |
58964a49 | 159 | clear_sys_error(); |
d02b48c6 RE |
160 | |
161 | if (s->info_callback != NULL) | |
162 | cb=s->info_callback; | |
163 | else if (s->ctx->info_callback != NULL) | |
164 | cb=s->ctx->info_callback; | |
165 | ||
d02b48c6 | 166 | s->in_handshake++; |
979689aa | 167 | if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); |
d02b48c6 RE |
168 | |
169 | for (;;) | |
170 | { | |
171 | state=s->state; | |
172 | ||
173 | switch(s->state) | |
174 | { | |
175 | case SSL_ST_BEFORE: | |
176 | case SSL_ST_ACCEPT: | |
177 | case SSL_ST_BEFORE|SSL_ST_ACCEPT: | |
178 | case SSL_ST_OK|SSL_ST_ACCEPT: | |
179 | ||
413c4f45 | 180 | s->server=1; |
d02b48c6 RE |
181 | if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); |
182 | ||
58964a49 | 183 | /* s->version=SSL3_VERSION; */ |
d02b48c6 RE |
184 | s->type=SSL_ST_ACCEPT; |
185 | ||
186 | if (s->init_buf == NULL) | |
187 | { | |
188 | if ((buf=BUF_MEM_new()) == NULL) | |
189 | { | |
190 | ret= -1; | |
191 | goto end; | |
192 | } | |
193 | if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) | |
194 | { | |
bb1ddd3d | 195 | BUF_MEM_free(buf); |
d02b48c6 RE |
196 | ret= -1; |
197 | goto end; | |
198 | } | |
199 | s->init_buf=buf; | |
200 | } | |
201 | ||
202 | ssl3_init_finished_mac(s); | |
203 | ||
204 | s->state=SSL23_ST_SR_CLNT_HELLO_A; | |
413c4f45 | 205 | s->ctx->stats.sess_accept++; |
d02b48c6 RE |
206 | s->init_num=0; |
207 | break; | |
208 | ||
209 | case SSL23_ST_SR_CLNT_HELLO_A: | |
210 | case SSL23_ST_SR_CLNT_HELLO_B: | |
211 | ||
212 | s->shutdown=0; | |
213 | ret=ssl23_get_client_hello(s); | |
214 | if (ret >= 0) cb=NULL; | |
215 | goto end; | |
dfeab068 | 216 | /* break; */ |
d02b48c6 RE |
217 | |
218 | default: | |
219 | SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE); | |
220 | ret= -1; | |
221 | goto end; | |
222 | /* break; */ | |
223 | } | |
224 | ||
225 | if ((cb != NULL) && (s->state != state)) | |
226 | { | |
227 | new_state=s->state; | |
228 | s->state=state; | |
229 | cb(s,SSL_CB_ACCEPT_LOOP,1); | |
230 | s->state=new_state; | |
231 | } | |
232 | } | |
233 | end: | |
ba1c6022 | 234 | s->in_handshake--; |
d02b48c6 RE |
235 | if (cb != NULL) |
236 | cb(s,SSL_CB_ACCEPT_EXIT,ret); | |
d02b48c6 RE |
237 | return(ret); |
238 | } | |
239 | ||
240 | ||
6b691a5c | 241 | int ssl23_get_client_hello(SSL *s) |
d02b48c6 | 242 | { |
c51ae173 | 243 | char buf_space[11]; /* Request this many bytes in initial read. |
dab6f095 BM |
244 | * We can detect SSL 3.0/TLS 1.0 Client Hellos |
245 | * ('type == 3') correctly only when the following | |
246 | * is in a single record, which is not guaranteed by | |
247 | * the protocol specification: | |
c51ae173 BM |
248 | * Byte Content |
249 | * 0 type \ | |
250 | * 1/2 version > record header | |
251 | * 3/4 length / | |
252 | * 5 msg_type \ | |
253 | * 6-8 length > Client Hello message | |
254 | * 9/10 client_version / | |
255 | */ | |
d02b48c6 | 256 | char *buf= &(buf_space[0]); |
48948d53 | 257 | unsigned char *p,*d,*d_len,*dd; |
d02b48c6 RE |
258 | unsigned int i; |
259 | unsigned int csl,sil,cl; | |
cb0369d8 | 260 | int n=0,j; |
4c5fac4a | 261 | int type=0; |
413c4f45 | 262 | int v[2]; |
d02b48c6 | 263 | |
d02b48c6 RE |
264 | if (s->state == SSL23_ST_SR_CLNT_HELLO_A) |
265 | { | |
de1915e4 BM |
266 | /* read the initial header */ |
267 | v[0]=v[1]=0; | |
268 | ||
d02b48c6 RE |
269 | if (!ssl3_setup_buffers(s)) goto err; |
270 | ||
ba3a6e72 BM |
271 | n=ssl23_read_bytes(s, sizeof buf_space); |
272 | if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */ | |
d02b48c6 RE |
273 | |
274 | p=s->packet; | |
275 | ||
276 | memcpy(buf,p,n); | |
277 | ||
278 | if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO)) | |
279 | { | |
074309b7 BM |
280 | /* |
281 | * SSLv2 header | |
282 | */ | |
d02b48c6 RE |
283 | if ((p[3] == 0x00) && (p[4] == 0x02)) |
284 | { | |
413c4f45 | 285 | v[0]=p[3]; v[1]=p[4]; |
d02b48c6 | 286 | /* SSLv2 */ |
58964a49 RE |
287 | if (!(s->options & SSL_OP_NO_SSLv2)) |
288 | type=1; | |
d02b48c6 RE |
289 | } |
290 | else if (p[3] == SSL3_VERSION_MAJOR) | |
291 | { | |
413c4f45 | 292 | v[0]=p[3]; v[1]=p[4]; |
58964a49 RE |
293 | /* SSLv3/TLSv1 */ |
294 | if (p[4] >= TLS1_VERSION_MINOR) | |
295 | { | |
9472baae DSH |
296 | if (p[4] >= TLS1_2_VERSION_MINOR && |
297 | !(s->options & SSL_OP_NO_TLSv1_2)) | |
298 | { | |
299 | s->version=TLS1_2_VERSION; | |
300 | s->state=SSL23_ST_SR_CLNT_HELLO_B; | |
301 | } | |
302 | else if (p[4] >= TLS1_1_VERSION_MINOR && | |
b4b15f68 DSH |
303 | !(s->options & SSL_OP_NO_TLSv1_1)) |
304 | { | |
305 | s->version=TLS1_1_VERSION; | |
9472baae | 306 | /* type=2; */ /* done later to survive restarts */ |
b4b15f68 DSH |
307 | s->state=SSL23_ST_SR_CLNT_HELLO_B; |
308 | } | |
309 | else if (!(s->options & SSL_OP_NO_TLSv1)) | |
58964a49 | 310 | { |
cb0369d8 | 311 | s->version=TLS1_VERSION; |
074309b7 | 312 | /* type=2; */ /* done later to survive restarts */ |
58964a49 RE |
313 | s->state=SSL23_ST_SR_CLNT_HELLO_B; |
314 | } | |
315 | else if (!(s->options & SSL_OP_NO_SSLv3)) | |
316 | { | |
cb0369d8 | 317 | s->version=SSL3_VERSION; |
074309b7 | 318 | /* type=2; */ |
58964a49 RE |
319 | s->state=SSL23_ST_SR_CLNT_HELLO_B; |
320 | } | |
dfeab068 RE |
321 | else if (!(s->options & SSL_OP_NO_SSLv2)) |
322 | { | |
323 | type=1; | |
324 | } | |
58964a49 RE |
325 | } |
326 | else if (!(s->options & SSL_OP_NO_SSLv3)) | |
074309b7 | 327 | { |
cb0369d8 | 328 | s->version=SSL3_VERSION; |
074309b7 | 329 | /* type=2; */ |
58964a49 | 330 | s->state=SSL23_ST_SR_CLNT_HELLO_B; |
074309b7 | 331 | } |
dfeab068 RE |
332 | else if (!(s->options & SSL_OP_NO_SSLv2)) |
333 | type=1; | |
58964a49 | 334 | |
d02b48c6 RE |
335 | } |
336 | } | |
bc2d623c | 337 | /* p[4] < 5 ... silly record length? */ |
d02b48c6 RE |
338 | else if ((p[0] == SSL3_RT_HANDSHAKE) && |
339 | (p[1] == SSL3_VERSION_MAJOR) && | |
074309b7 | 340 | (p[5] == SSL3_MT_CLIENT_HELLO) && |
bc2d623c | 341 | ((p[3] == 0 && p[4] < 5) |
41c0f686 | 342 | || (p[9] >= p[1]))) |
d02b48c6 | 343 | { |
074309b7 BM |
344 | /* |
345 | * SSLv3 or tls1 header | |
346 | */ | |
347 | ||
f1192b7f | 348 | v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */ |
dab6f095 | 349 | /* We must look at client_version inside the Client Hello message |
f1192b7f BM |
350 | * to get the correct minor version. |
351 | * However if we have only a pathologically small fragment of the | |
ba1c6022 BM |
352 | * Client Hello message, this would be difficult, and we'd have |
353 | * to read more records to find out. | |
354 | * No known SSL 3.0 client fragments ClientHello like this, | |
40a2200d DB |
355 | * so we simply reject such connections to avoid |
356 | * protocol version downgrade attacks. */ | |
dab6f095 | 357 | if (p[3] == 0 && p[4] < 6) |
f1192b7f BM |
358 | { |
359 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL); | |
360 | goto err; | |
361 | } | |
41c0f686 DSH |
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 | */ | |
40a2200d | 367 | if (p[9] > SSL3_VERSION_MAJOR) |
41c0f686 | 368 | v[1]=0xff; |
ba1c6022 BM |
369 | else |
370 | v[1]=p[10]; /* minor version according to client_version */ | |
f70df1b8 | 371 | if (v[1] >= TLS1_VERSION_MINOR) |
58964a49 | 372 | { |
9472baae DSH |
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 && | |
b4b15f68 DSH |
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)) | |
58964a49 | 386 | { |
cb0369d8 | 387 | s->version=TLS1_VERSION; |
58964a49 | 388 | type=3; |
58964a49 RE |
389 | } |
390 | else if (!(s->options & SSL_OP_NO_SSLv3)) | |
cb0369d8 BM |
391 | { |
392 | s->version=SSL3_VERSION; | |
58964a49 | 393 | type=3; |
cb0369d8 | 394 | } |
58964a49 | 395 | } |
a661b653 | 396 | else |
ac7da000 | 397 | { |
a661b653 BM |
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 | } | |
ac7da000 | 411 | } |
d02b48c6 | 412 | } |
dfeab068 RE |
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)) | |
d02b48c6 | 417 | { |
58964a49 | 418 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST); |
d02b48c6 RE |
419 | goto err; |
420 | } | |
dfeab068 | 421 | else if (strncmp("CONNECT",(char *)p,7) == 0) |
d02b48c6 | 422 | { |
58964a49 | 423 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST); |
d02b48c6 RE |
424 | goto err; |
425 | } | |
426 | } | |
427 | ||
a46c7052 BM |
428 | /* ensure that TLS_MAX_VERSION is up-to-date */ |
429 | OPENSSL_assert(s->version <= TLS_MAX_VERSION); | |
430 | ||
ccf6a19e DSH |
431 | if (s->version < TLS1_2_VERSION && tls1_suiteb(s)) |
432 | { | |
433 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, | |
434 | SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE); | |
435 | goto err; | |
436 | } | |
437 | ||
7043fa70 DSH |
438 | #ifdef OPENSSL_FIPS |
439 | if (FIPS_mode() && (s->version < TLS1_VERSION)) | |
440 | { | |
441 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, | |
442 | SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); | |
443 | goto err; | |
444 | } | |
445 | #endif | |
446 | ||
d02b48c6 RE |
447 | if (s->state == SSL23_ST_SR_CLNT_HELLO_B) |
448 | { | |
cb0369d8 BM |
449 | /* we have SSLv3/TLSv1 in an SSLv2 header |
450 | * (other cases skip this state) */ | |
451 | ||
d02b48c6 RE |
452 | type=2; |
453 | p=s->packet; | |
cb0369d8 | 454 | v[0] = p[3]; /* == SSL3_VERSION_MAJOR */ |
de1915e4 | 455 | v[1] = p[4]; |
cb0369d8 | 456 | |
6977c7e2 TH |
457 | /*- |
458 | * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2 | |
40a2200d DB |
459 | * header is sent directly on the wire, not wrapped as a TLS |
460 | * record. It's format is: | |
461 | * Byte Content | |
462 | * 0-1 msg_length | |
463 | * 2 msg_type | |
464 | * 3-4 version | |
465 | * 5-6 cipher_spec_length | |
466 | * 7-8 session_id_length | |
467 | * 9-10 challenge_length | |
468 | * ... ... | |
469 | */ | |
d02b48c6 RE |
470 | n=((p[0]&0x7f)<<8)|p[1]; |
471 | if (n > (1024*4)) | |
472 | { | |
473 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE); | |
474 | goto err; | |
475 | } | |
40a2200d DB |
476 | if (n < 9) |
477 | { | |
478 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH); | |
479 | goto err; | |
480 | } | |
d02b48c6 RE |
481 | |
482 | j=ssl23_read_bytes(s,n+2); | |
40a2200d DB |
483 | /* We previously read 11 bytes, so if j > 0, we must have |
484 | * j == n+2 == s->packet_length. We have at least 11 valid | |
485 | * packet bytes. */ | |
d02b48c6 RE |
486 | if (j <= 0) return(j); |
487 | ||
cf82191d | 488 | ssl3_finish_mac(s, s->packet+2, s->packet_length-2); |
bc2d623c MC |
489 | |
490 | /* CLIENT-HELLO */ | |
cf82191d | 491 | if (s->msg_callback) |
bc2d623c | 492 | s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg); |
d02b48c6 RE |
493 | |
494 | p=s->packet; | |
495 | p+=5; | |
496 | n2s(p,csl); | |
497 | n2s(p,sil); | |
498 | n2s(p,cl); | |
499 | d=(unsigned char *)s->init_buf->data; | |
f1fd4544 BM |
500 | if ((csl+sil+cl+11) != s->packet_length) /* We can't have TLS extensions in SSL 2.0 format |
501 | * Client Hello, can we? Error condition should be | |
502 | * '>' otherweise */ | |
d02b48c6 RE |
503 | { |
504 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH); | |
505 | goto err; | |
506 | } | |
507 | ||
9ba3ec91 BM |
508 | /* record header: msg_type ... */ |
509 | *(d++) = SSL3_MT_CLIENT_HELLO; | |
48948d53 | 510 | /* ... and length (actual value will be written later) */ |
9ba3ec91 BM |
511 | d_len = d; |
512 | d += 3; | |
48948d53 BM |
513 | |
514 | /* client_version */ | |
cb0369d8 BM |
515 | *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */ |
516 | *(d++) = v[1]; | |
d02b48c6 RE |
517 | |
518 | /* lets populate the random area */ | |
657e60fa | 519 | /* get the challenge_length */ |
d02b48c6 RE |
520 | i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl; |
521 | memset(d,0,SSL3_RANDOM_SIZE); | |
522 | memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i); | |
523 | d+=SSL3_RANDOM_SIZE; | |
524 | ||
525 | /* no session-id reuse */ | |
526 | *(d++)=0; | |
527 | ||
528 | /* ciphers */ | |
529 | j=0; | |
530 | dd=d; | |
531 | d+=2; | |
532 | for (i=0; i<csl; i+=3) | |
533 | { | |
534 | if (p[i] != 0) continue; | |
535 | *(d++)=p[i+1]; | |
536 | *(d++)=p[i+2]; | |
537 | j+=2; | |
538 | } | |
539 | s2n(j,dd); | |
540 | ||
dfeab068 | 541 | /* COMPRESSION */ |
d02b48c6 RE |
542 | *(d++)=1; |
543 | *(d++)=0; | |
544 | ||
f1fd4544 | 545 | #if 0 |
ed3883d2 | 546 | /* copy any remaining data with may be extensions */ |
f1fd4544 BM |
547 | p = p+csl+sil+cl; |
548 | while (p < s->packet+s->packet_length) | |
549 | { | |
ed3883d2 | 550 | *(d++)=*(p++); |
f1fd4544 BM |
551 | } |
552 | #endif | |
ed3883d2 | 553 | |
2fb3f002 | 554 | i = (d-(unsigned char *)s->init_buf->data) - 4; |
9ba3ec91 | 555 | l2n3((long)i, d_len); |
d02b48c6 RE |
556 | |
557 | /* get the data reused from the init_buf */ | |
558 | s->s3->tmp.reuse_message=1; | |
559 | s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO; | |
560 | s->s3->tmp.message_size=i; | |
561 | } | |
562 | ||
074309b7 BM |
563 | /* imaginary new state (for program structure): */ |
564 | /* s->state = SSL23_SR_CLNT_HELLO_C */ | |
565 | ||
d02b48c6 RE |
566 | if (type == 1) |
567 | { | |
bc36ee62 | 568 | #ifdef OPENSSL_NO_SSL2 |
cef80e8c | 569 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); |
aa82db4f UM |
570 | goto err; |
571 | #else | |
d02b48c6 | 572 | /* we are talking sslv2 */ |
58964a49 | 573 | /* we need to clean up the SSLv3/TLSv1 setup and put in the |
d02b48c6 RE |
574 | * sslv2 stuff. */ |
575 | ||
576 | if (s->s2 == NULL) | |
577 | { | |
578 | if (!ssl2_new(s)) | |
579 | goto err; | |
580 | } | |
581 | else | |
582 | ssl2_clear(s); | |
583 | ||
584 | if (s->s3 != NULL) ssl3_free(s); | |
585 | ||
54a656ef | 586 | if (!BUF_MEM_grow_clean(s->init_buf, |
d02b48c6 RE |
587 | SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) |
588 | { | |
589 | goto err; | |
590 | } | |
591 | ||
592 | s->state=SSL2_ST_GET_CLIENT_HELLO_A; | |
72dce768 | 593 | if (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3) |
d02b48c6 RE |
594 | s->s2->ssl2_rollback=0; |
595 | else | |
aa826d88 BM |
596 | /* reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0 |
597 | * (SSL 3.0 draft/RFC 2246, App. E.2) */ | |
d02b48c6 RE |
598 | s->s2->ssl2_rollback=1; |
599 | ||
074309b7 | 600 | /* setup the n bytes we have read so we get them from |
d02b48c6 RE |
601 | * the sslv2 buffer */ |
602 | s->rstate=SSL_ST_READ_HEADER; | |
603 | s->packet_length=n; | |
604 | s->packet= &(s->s2->rbuf[0]); | |
605 | memcpy(s->packet,buf,n); | |
606 | s->s2->rbuf_left=n; | |
607 | s->s2->rbuf_offs=0; | |
608 | ||
609 | s->method=SSLv2_server_method(); | |
610 | s->handshake_func=s->method->ssl_accept; | |
aa82db4f | 611 | #endif |
d02b48c6 RE |
612 | } |
613 | ||
614 | if ((type == 2) || (type == 3)) | |
615 | { | |
074309b7 | 616 | /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */ |
b6ece4c1 KR |
617 | const SSL_METHOD *new_method; |
618 | new_method = ssl23_get_server_method(s->version); | |
619 | if (new_method == NULL) | |
82180dcc GT |
620 | { |
621 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); | |
622 | goto err; | |
623 | } | |
b6ece4c1 | 624 | s->method = new_method; |
d02b48c6 | 625 | |
58964a49 | 626 | if (!ssl_init_wbio_buffer(s,1)) goto err; |
d02b48c6 RE |
627 | |
628 | /* we are in this state */ | |
629 | s->state=SSL3_ST_SR_CLNT_HELLO_A; | |
630 | ||
631 | if (type == 3) | |
632 | { | |
633 | /* put the 'n' bytes we have read into the input buffer | |
634 | * for SSLv3 */ | |
635 | s->rstate=SSL_ST_READ_HEADER; | |
636 | s->packet_length=n; | |
8671b898 BL |
637 | if (s->s3->rbuf.buf == NULL) |
638 | if (!ssl3_setup_read_buffer(s)) | |
639 | goto err; | |
640 | ||
d02b48c6 RE |
641 | s->packet= &(s->s3->rbuf.buf[0]); |
642 | memcpy(s->packet,buf,n); | |
643 | s->s3->rbuf.left=n; | |
644 | s->s3->rbuf.offset=0; | |
645 | } | |
646 | else | |
647 | { | |
648 | s->packet_length=0; | |
649 | s->s3->rbuf.left=0; | |
650 | s->s3->rbuf.offset=0; | |
651 | } | |
074309b7 | 652 | #if 0 /* ssl3_get_client_hello does this */ |
413c4f45 | 653 | s->client_version=(v[0]<<8)|v[1]; |
074309b7 | 654 | #endif |
d02b48c6 RE |
655 | s->handshake_func=s->method->ssl_accept; |
656 | } | |
657 | ||
658 | if ((type < 1) || (type > 3)) | |
659 | { | |
660 | /* bad, very bad */ | |
661 | SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL); | |
662 | goto err; | |
663 | } | |
664 | s->init_num=0; | |
665 | ||
26a3a48d | 666 | if (buf != buf_space) OPENSSL_free(buf); |
d02b48c6 RE |
667 | return(SSL_accept(s)); |
668 | err: | |
26a3a48d | 669 | if (buf != buf_space) OPENSSL_free(buf); |
d02b48c6 RE |
670 | return(-1); |
671 | } |