Line data Source code
1 : /* ssl/s2_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) 1998-2001 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 "ssl_locl.h"
113 : #ifndef OPENSSL_NO_SSL2
114 : #include "../crypto/constant_time_locl.h"
115 : # include <stdio.h>
116 : # include <openssl/bio.h>
117 : # include <openssl/rand.h>
118 : # include <openssl/objects.h>
119 : # include <openssl/evp.h>
120 :
121 : static const SSL_METHOD *ssl2_get_server_method(int ver);
122 : static int get_client_master_key(SSL *s);
123 : static int get_client_hello(SSL *s);
124 : static int server_hello(SSL *s);
125 : static int get_client_finished(SSL *s);
126 : static int server_verify(SSL *s);
127 : static int server_finish(SSL *s);
128 : static int request_certificate(SSL *s);
129 : static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
130 : unsigned char *to, int padding);
131 : # define BREAK break
132 :
133 0 : static const SSL_METHOD *ssl2_get_server_method(int ver)
134 : {
135 0 : if (ver == SSL2_VERSION)
136 : return (SSLv2_server_method());
137 : else
138 0 : return (NULL);
139 : }
140 :
141 0 : IMPLEMENT_ssl2_meth_func(SSLv2_server_method,
142 : ssl2_accept,
143 : ssl_undefined_function, ssl2_get_server_method)
144 :
145 0 : int ssl2_accept(SSL *s)
146 : {
147 0 : unsigned long l = (unsigned long)time(NULL);
148 : BUF_MEM *buf = NULL;
149 : int ret = -1;
150 : long num1;
151 : void (*cb) (const SSL *ssl, int type, int val) = NULL;
152 : int new_state, state;
153 :
154 0 : RAND_add(&l, sizeof(l), 0);
155 0 : ERR_clear_error();
156 0 : clear_sys_error();
157 :
158 0 : if (s->info_callback != NULL)
159 : cb = s->info_callback;
160 0 : else if (s->ctx->info_callback != NULL)
161 : cb = s->ctx->info_callback;
162 :
163 : /* init things to blank */
164 0 : s->in_handshake++;
165 0 : if (!SSL_in_init(s) || SSL_in_before(s))
166 0 : SSL_clear(s);
167 :
168 0 : if (s->cert == NULL) {
169 0 : SSLerr(SSL_F_SSL2_ACCEPT, SSL_R_NO_CERTIFICATE_SET);
170 0 : return (-1);
171 : }
172 :
173 0 : clear_sys_error();
174 : for (;;) {
175 0 : state = s->state;
176 :
177 0 : switch (s->state) {
178 : case SSL_ST_BEFORE:
179 : case SSL_ST_ACCEPT:
180 : case SSL_ST_BEFORE | SSL_ST_ACCEPT:
181 : case SSL_ST_OK | SSL_ST_ACCEPT:
182 :
183 0 : s->server = 1;
184 0 : if (cb != NULL)
185 0 : cb(s, SSL_CB_HANDSHAKE_START, 1);
186 :
187 0 : s->version = SSL2_VERSION;
188 0 : s->type = SSL_ST_ACCEPT;
189 :
190 0 : if (s->init_buf == NULL) {
191 0 : if ((buf = BUF_MEM_new()) == NULL) {
192 : ret = -1;
193 : goto end;
194 : }
195 0 : if (!BUF_MEM_grow
196 0 : (buf, (int)SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) {
197 0 : BUF_MEM_free(buf);
198 : ret = -1;
199 0 : goto end;
200 : }
201 0 : s->init_buf = buf;
202 : }
203 0 : s->init_num = 0;
204 0 : s->ctx->stats.sess_accept++;
205 0 : s->handshake_func = ssl2_accept;
206 0 : s->state = SSL2_ST_GET_CLIENT_HELLO_A;
207 0 : BREAK;
208 :
209 : case SSL2_ST_GET_CLIENT_HELLO_A:
210 : case SSL2_ST_GET_CLIENT_HELLO_B:
211 : case SSL2_ST_GET_CLIENT_HELLO_C:
212 0 : s->shutdown = 0;
213 0 : ret = get_client_hello(s);
214 0 : if (ret <= 0)
215 : goto end;
216 0 : s->init_num = 0;
217 0 : s->state = SSL2_ST_SEND_SERVER_HELLO_A;
218 0 : BREAK;
219 :
220 : case SSL2_ST_SEND_SERVER_HELLO_A:
221 : case SSL2_ST_SEND_SERVER_HELLO_B:
222 0 : ret = server_hello(s);
223 0 : if (ret <= 0)
224 : goto end;
225 0 : s->init_num = 0;
226 0 : if (!s->hit) {
227 0 : s->state = SSL2_ST_GET_CLIENT_MASTER_KEY_A;
228 0 : BREAK;
229 : } else {
230 0 : s->state = SSL2_ST_SERVER_START_ENCRYPTION;
231 0 : BREAK;
232 : }
233 : case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
234 : case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
235 0 : ret = get_client_master_key(s);
236 0 : if (ret <= 0)
237 : goto end;
238 0 : s->init_num = 0;
239 0 : s->state = SSL2_ST_SERVER_START_ENCRYPTION;
240 0 : BREAK;
241 :
242 : case SSL2_ST_SERVER_START_ENCRYPTION:
243 : /*
244 : * Ok we how have sent all the stuff needed to start encrypting,
245 : * the next packet back will be encrypted.
246 : */
247 0 : if (!ssl2_enc_init(s, 0)) {
248 : ret = -1;
249 : goto end;
250 : }
251 0 : s->s2->clear_text = 0;
252 0 : s->state = SSL2_ST_SEND_SERVER_VERIFY_A;
253 0 : BREAK;
254 :
255 : case SSL2_ST_SEND_SERVER_VERIFY_A:
256 : case SSL2_ST_SEND_SERVER_VERIFY_B:
257 0 : ret = server_verify(s);
258 0 : if (ret <= 0)
259 : goto end;
260 0 : s->init_num = 0;
261 0 : if (s->hit) {
262 : /*
263 : * If we are in here, we have been buffering the output, so
264 : * we need to flush it and remove buffering from future
265 : * traffic
266 : */
267 0 : s->state = SSL2_ST_SEND_SERVER_VERIFY_C;
268 0 : BREAK;
269 : } else {
270 0 : s->state = SSL2_ST_GET_CLIENT_FINISHED_A;
271 0 : break;
272 : }
273 :
274 : case SSL2_ST_SEND_SERVER_VERIFY_C:
275 : /* get the number of bytes to write */
276 0 : num1 = BIO_ctrl(s->wbio, BIO_CTRL_INFO, 0, NULL);
277 0 : if (num1 > 0) {
278 0 : s->rwstate = SSL_WRITING;
279 0 : num1 = BIO_flush(s->wbio);
280 0 : if (num1 <= 0) {
281 : ret = -1;
282 : goto end;
283 : }
284 0 : s->rwstate = SSL_NOTHING;
285 : }
286 :
287 : /* flushed and now remove buffering */
288 0 : s->wbio = BIO_pop(s->wbio);
289 :
290 0 : s->state = SSL2_ST_GET_CLIENT_FINISHED_A;
291 0 : BREAK;
292 :
293 : case SSL2_ST_GET_CLIENT_FINISHED_A:
294 : case SSL2_ST_GET_CLIENT_FINISHED_B:
295 0 : ret = get_client_finished(s);
296 0 : if (ret <= 0)
297 : goto end;
298 0 : s->init_num = 0;
299 0 : s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
300 0 : BREAK;
301 :
302 : case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
303 : case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
304 : case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
305 : case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
306 : /*
307 : * don't do a 'request certificate' if we don't want to, or we
308 : * already have one, and we only want to do it once.
309 : */
310 0 : if (!(s->verify_mode & SSL_VERIFY_PEER) ||
311 0 : ((s->session->peer != NULL) &&
312 0 : (s->verify_mode & SSL_VERIFY_CLIENT_ONCE))) {
313 0 : s->state = SSL2_ST_SEND_SERVER_FINISHED_A;
314 0 : break;
315 : } else {
316 0 : ret = request_certificate(s);
317 0 : if (ret <= 0)
318 : goto end;
319 0 : s->init_num = 0;
320 0 : s->state = SSL2_ST_SEND_SERVER_FINISHED_A;
321 : }
322 0 : BREAK;
323 :
324 : case SSL2_ST_SEND_SERVER_FINISHED_A:
325 : case SSL2_ST_SEND_SERVER_FINISHED_B:
326 0 : ret = server_finish(s);
327 0 : if (ret <= 0)
328 : goto end;
329 0 : s->init_num = 0;
330 0 : s->state = SSL_ST_OK;
331 0 : break;
332 :
333 : case SSL_ST_OK:
334 0 : BUF_MEM_free(s->init_buf);
335 0 : ssl_free_wbio_buffer(s);
336 0 : s->init_buf = NULL;
337 0 : s->init_num = 0;
338 : /* ERR_clear_error(); */
339 :
340 0 : ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
341 :
342 0 : s->ctx->stats.sess_accept_good++;
343 : /* s->server=1; */
344 : ret = 1;
345 :
346 0 : if (cb != NULL)
347 0 : cb(s, SSL_CB_HANDSHAKE_DONE, 1);
348 :
349 : goto end;
350 : /* BREAK; */
351 :
352 : default:
353 0 : SSLerr(SSL_F_SSL2_ACCEPT, SSL_R_UNKNOWN_STATE);
354 : ret = -1;
355 0 : goto end;
356 : /* BREAK; */
357 : }
358 :
359 0 : if ((cb != NULL) && (s->state != state)) {
360 : new_state = s->state;
361 0 : s->state = state;
362 0 : cb(s, SSL_CB_ACCEPT_LOOP, 1);
363 0 : s->state = new_state;
364 : }
365 : }
366 : end:
367 0 : s->in_handshake--;
368 0 : if (cb != NULL)
369 0 : cb(s, SSL_CB_ACCEPT_EXIT, ret);
370 0 : return (ret);
371 : }
372 :
373 0 : static int get_client_master_key(SSL *s)
374 : {
375 : int is_export, i, n, keya;
376 : unsigned int num_encrypted_key_bytes, key_length;
377 : unsigned long len;
378 : unsigned char *p;
379 : const SSL_CIPHER *cp;
380 : const EVP_CIPHER *c;
381 : const EVP_MD *md;
382 : unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
383 : unsigned char decrypt_good;
384 : size_t j;
385 :
386 0 : p = (unsigned char *)s->init_buf->data;
387 0 : if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A) {
388 0 : i = ssl2_read(s, (char *)&(p[s->init_num]), 10 - s->init_num);
389 :
390 0 : if (i < (10 - s->init_num))
391 0 : return (ssl2_part_read(s, SSL_F_GET_CLIENT_MASTER_KEY, i));
392 0 : s->init_num = 10;
393 :
394 0 : if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY) {
395 0 : if (p[-1] != SSL2_MT_ERROR) {
396 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
397 0 : SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
398 : SSL_R_READ_WRONG_PACKET_TYPE);
399 : } else
400 0 : SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR);
401 : return (-1);
402 : }
403 :
404 0 : cp = ssl2_get_cipher_by_char(p);
405 0 : if (cp == NULL) {
406 0 : ssl2_return_error(s, SSL2_PE_NO_CIPHER);
407 0 : SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH);
408 0 : return (-1);
409 : }
410 0 : s->session->cipher = cp;
411 :
412 : p += 3;
413 0 : n2s(p, i);
414 0 : s->s2->tmp.clear = i;
415 0 : n2s(p, i);
416 0 : s->s2->tmp.enc = i;
417 0 : n2s(p, i);
418 0 : if (i > SSL_MAX_KEY_ARG_LENGTH) {
419 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
420 0 : SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG);
421 0 : return -1;
422 : }
423 0 : s->session->key_arg_length = i;
424 0 : s->state = SSL2_ST_GET_CLIENT_MASTER_KEY_B;
425 : }
426 :
427 : /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
428 0 : p = (unsigned char *)s->init_buf->data;
429 0 : if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) {
430 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
431 0 : SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
432 0 : return -1;
433 : }
434 0 : keya = s->session->key_arg_length;
435 0 : len =
436 0 : 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc +
437 0 : (unsigned long)keya;
438 0 : if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) {
439 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
440 0 : SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_MESSAGE_TOO_LONG);
441 0 : return -1;
442 : }
443 0 : n = (int)len - s->init_num;
444 0 : i = ssl2_read(s, (char *)&(p[s->init_num]), n);
445 0 : if (i != n)
446 0 : return (ssl2_part_read(s, SSL_F_GET_CLIENT_MASTER_KEY, i));
447 0 : if (s->msg_callback) {
448 : /* CLIENT-MASTER-KEY */
449 0 : s->msg_callback(0, s->version, 0, p, (size_t)len, s,
450 : s->msg_callback_arg);
451 : }
452 0 : p += 10;
453 :
454 0 : memcpy(s->session->key_arg, &(p[s->s2->tmp.clear + s->s2->tmp.enc]),
455 : (unsigned int)keya);
456 :
457 0 : if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL) {
458 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
459 0 : SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_PRIVATEKEY);
460 0 : return (-1);
461 : }
462 :
463 0 : is_export = SSL_C_IS_EXPORT(s->session->cipher);
464 :
465 0 : if (!ssl_cipher_get_evp(s->session, &c, &md, NULL, NULL, NULL)) {
466 0 : ssl2_return_error(s, SSL2_PE_NO_CIPHER);
467 0 : SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
468 : SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
469 0 : return (0);
470 : }
471 :
472 : /*
473 : * The format of the CLIENT-MASTER-KEY message is
474 : * 1 byte message type
475 : * 3 bytes cipher
476 : * 2-byte clear key length (stored in s->s2->tmp.clear)
477 : * 2-byte encrypted key length (stored in s->s2->tmp.enc)
478 : * 2-byte key args length (IV etc)
479 : * clear key
480 : * encrypted key
481 : * key args
482 : *
483 : * If the cipher is an export cipher, then the encrypted key bytes
484 : * are a fixed portion of the total key (5 or 8 bytes). The size of
485 : * this portion is in |num_encrypted_key_bytes|. If the cipher is not an
486 : * export cipher, then the entire key material is encrypted (i.e., clear
487 : * key length must be zero).
488 : */
489 0 : key_length = (unsigned int)EVP_CIPHER_key_length(c);
490 0 : if (key_length > SSL_MAX_MASTER_KEY_LENGTH) {
491 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
492 0 : SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
493 0 : return -1;
494 : }
495 :
496 0 : if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC) {
497 : is_export = 1;
498 : num_encrypted_key_bytes = 8;
499 0 : } else if (is_export) {
500 : num_encrypted_key_bytes = 5;
501 : } else {
502 : num_encrypted_key_bytes = key_length;
503 : }
504 :
505 0 : if (s->s2->tmp.clear + num_encrypted_key_bytes != key_length) {
506 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
507 0 : SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_LENGTH);
508 0 : return -1;
509 : }
510 : /*
511 : * The encrypted blob must decrypt to the encrypted portion of the key.
512 : * Decryption can't be expanding, so if we don't have enough encrypted
513 : * bytes to fit the key in the buffer, stop now.
514 : */
515 0 : if (s->s2->tmp.enc < num_encrypted_key_bytes) {
516 0 : ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
517 0 : SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_LENGTH_TOO_SHORT);
518 0 : return -1;
519 : }
520 :
521 : /*
522 : * We must not leak whether a decryption failure occurs because of
523 : * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246,
524 : * section 7.4.7.1). The code follows that advice of the TLS RFC and
525 : * generates a random premaster secret for the case that the decrypt
526 : * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1
527 : */
528 :
529 : /*
530 : * should be RAND_bytes, but we cannot work around a failure.
531 : */
532 0 : if (RAND_pseudo_bytes(rand_premaster_secret,
533 : (int)num_encrypted_key_bytes) <= 0)
534 : return 0;
535 :
536 0 : i = ssl_rsa_private_decrypt(s->cert, s->s2->tmp.enc,
537 0 : &(p[s->s2->tmp.clear]),
538 : &(p[s->s2->tmp.clear]),
539 0 : (s->s2->ssl2_rollback) ? RSA_SSLV23_PADDING :
540 : RSA_PKCS1_PADDING);
541 0 : ERR_clear_error();
542 : /*
543 : * If a bad decrypt, continue with protocol but with a random master
544 : * secret (Bleichenbacher attack)
545 : */
546 : decrypt_good = constant_time_eq_int_8(i, (int)num_encrypted_key_bytes);
547 0 : for (j = 0; j < num_encrypted_key_bytes; j++) {
548 0 : p[s->s2->tmp.clear + j] =
549 0 : constant_time_select_8(decrypt_good, p[s->s2->tmp.clear + j],
550 0 : rand_premaster_secret[j]);
551 : }
552 :
553 0 : s->session->master_key_length = (int)key_length;
554 0 : memcpy(s->session->master_key, p, key_length);
555 0 : OPENSSL_cleanse(p, key_length);
556 :
557 0 : return 1;
558 : }
559 :
560 0 : static int get_client_hello(SSL *s)
561 : {
562 : int i, n;
563 : unsigned long len;
564 : unsigned char *p;
565 : STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */
566 : STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */
567 : STACK_OF(SSL_CIPHER) *prio, *allow;
568 : int z;
569 :
570 : /*
571 : * This is a bit of a hack to check for the correct packet type the first
572 : * time round.
573 : */
574 0 : if (s->state == SSL2_ST_GET_CLIENT_HELLO_A) {
575 0 : s->first_packet = 1;
576 0 : s->state = SSL2_ST_GET_CLIENT_HELLO_B;
577 : }
578 :
579 0 : p = (unsigned char *)s->init_buf->data;
580 0 : if (s->state == SSL2_ST_GET_CLIENT_HELLO_B) {
581 0 : i = ssl2_read(s, (char *)&(p[s->init_num]), 9 - s->init_num);
582 0 : if (i < (9 - s->init_num))
583 0 : return (ssl2_part_read(s, SSL_F_GET_CLIENT_HELLO, i));
584 0 : s->init_num = 9;
585 :
586 0 : if (*(p++) != SSL2_MT_CLIENT_HELLO) {
587 0 : if (p[-1] != SSL2_MT_ERROR) {
588 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
589 0 : SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_READ_WRONG_PACKET_TYPE);
590 : } else
591 0 : SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_PEER_ERROR);
592 : return (-1);
593 : }
594 0 : n2s(p, i);
595 0 : if (i < s->version)
596 0 : s->version = i;
597 0 : n2s(p, i);
598 0 : s->s2->tmp.cipher_spec_length = i;
599 0 : n2s(p, i);
600 0 : s->s2->tmp.session_id_length = i;
601 0 : n2s(p, i);
602 0 : s->s2->challenge_length = i;
603 0 : if ((i < SSL2_MIN_CHALLENGE_LENGTH) ||
604 : (i > SSL2_MAX_CHALLENGE_LENGTH)) {
605 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
606 0 : SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_INVALID_CHALLENGE_LENGTH);
607 0 : return (-1);
608 : }
609 0 : s->state = SSL2_ST_GET_CLIENT_HELLO_C;
610 : }
611 :
612 : /* SSL2_ST_GET_CLIENT_HELLO_C */
613 0 : p = (unsigned char *)s->init_buf->data;
614 0 : len =
615 0 : 9 + (unsigned long)s->s2->tmp.cipher_spec_length +
616 0 : (unsigned long)s->s2->challenge_length +
617 0 : (unsigned long)s->s2->tmp.session_id_length;
618 0 : if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) {
619 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
620 0 : SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_MESSAGE_TOO_LONG);
621 0 : return -1;
622 : }
623 0 : n = (int)len - s->init_num;
624 0 : i = ssl2_read(s, (char *)&(p[s->init_num]), n);
625 0 : if (i != n)
626 0 : return (ssl2_part_read(s, SSL_F_GET_CLIENT_HELLO, i));
627 0 : if (s->msg_callback) {
628 : /* CLIENT-HELLO */
629 0 : s->msg_callback(0, s->version, 0, p, (size_t)len, s,
630 : s->msg_callback_arg);
631 : }
632 0 : p += 9;
633 :
634 : /*
635 : * get session-id before cipher stuff so we can get out session structure
636 : * if it is cached
637 : */
638 : /* session-id */
639 0 : if ((s->s2->tmp.session_id_length != 0) &&
640 : (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH)) {
641 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
642 0 : SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_BAD_SSL_SESSION_ID_LENGTH);
643 0 : return (-1);
644 : }
645 :
646 0 : if (s->s2->tmp.session_id_length == 0) {
647 0 : if (!ssl_get_new_session(s, 1)) {
648 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
649 0 : return (-1);
650 : }
651 : } else {
652 0 : i = ssl_get_prev_session(s, &(p[s->s2->tmp.cipher_spec_length]),
653 : s->s2->tmp.session_id_length, NULL);
654 0 : if (i == 1) { /* previous session */
655 0 : s->hit = 1;
656 0 : } else if (i == -1) {
657 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
658 0 : return (-1);
659 : } else {
660 0 : if (s->cert == NULL) {
661 0 : ssl2_return_error(s, SSL2_PE_NO_CERTIFICATE);
662 0 : SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_NO_CERTIFICATE_SET);
663 0 : return (-1);
664 : }
665 :
666 0 : if (!ssl_get_new_session(s, 1)) {
667 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
668 0 : return (-1);
669 : }
670 : }
671 : }
672 :
673 0 : if (!s->hit) {
674 0 : cs = ssl_bytes_to_cipher_list(s, p, s->s2->tmp.cipher_spec_length,
675 0 : &s->session->ciphers);
676 0 : if (cs == NULL)
677 : goto mem_err;
678 :
679 0 : cl = SSL_get_ciphers(s);
680 :
681 0 : if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) {
682 0 : prio = sk_SSL_CIPHER_dup(cl);
683 0 : if (prio == NULL)
684 : goto mem_err;
685 : allow = cs;
686 : } else {
687 : prio = cs;
688 : allow = cl;
689 : }
690 0 : for (z = 0; z < sk_SSL_CIPHER_num(prio); z++) {
691 0 : if (sk_SSL_CIPHER_find(allow, sk_SSL_CIPHER_value(prio, z)) < 0) {
692 0 : (void)sk_SSL_CIPHER_delete(prio, z);
693 0 : z--;
694 : }
695 : }
696 0 : if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) {
697 0 : sk_SSL_CIPHER_free(s->session->ciphers);
698 0 : s->session->ciphers = prio;
699 : }
700 : /*
701 : * s->session->ciphers should now have a list of ciphers that are on
702 : * both the client and server. This list is ordered by the order the
703 : * client sent the ciphers or in the order of the server's preference
704 : * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.
705 : */
706 : }
707 0 : p += s->s2->tmp.cipher_spec_length;
708 : /* done cipher selection */
709 :
710 : /* session id extracted already */
711 0 : p += s->s2->tmp.session_id_length;
712 :
713 : /* challenge */
714 0 : if (s->s2->challenge_length > sizeof s->s2->challenge) {
715 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
716 0 : SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
717 0 : return -1;
718 : }
719 0 : memcpy(s->s2->challenge, p, (unsigned int)s->s2->challenge_length);
720 0 : return (1);
721 : mem_err:
722 0 : SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_MALLOC_FAILURE);
723 0 : return (0);
724 : }
725 :
726 0 : static int server_hello(SSL *s)
727 : {
728 : unsigned char *p, *d;
729 : int n, hit;
730 :
731 0 : p = (unsigned char *)s->init_buf->data;
732 0 : if (s->state == SSL2_ST_SEND_SERVER_HELLO_A) {
733 0 : d = p + 11;
734 0 : *(p++) = SSL2_MT_SERVER_HELLO; /* type */
735 0 : hit = s->hit;
736 0 : *(p++) = (unsigned char)hit;
737 : # if 1
738 0 : if (!hit) {
739 0 : if (s->session->sess_cert != NULL)
740 : /*
741 : * This can't really happen because get_client_hello has
742 : * called ssl_get_new_session, which does not set sess_cert.
743 : */
744 0 : ssl_sess_cert_free(s->session->sess_cert);
745 0 : s->session->sess_cert = ssl_sess_cert_new();
746 0 : if (s->session->sess_cert == NULL) {
747 0 : SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE);
748 0 : return (-1);
749 : }
750 : }
751 : /*
752 : * If 'hit' is set, then s->sess_cert may be non-NULL or NULL,
753 : * depending on whether it survived in the internal cache or was
754 : * retrieved from an external cache. If it is NULL, we cannot put any
755 : * useful data in it anyway, so we don't touch it.
756 : */
757 :
758 : # else /* That's what used to be done when cert_st
759 : * and sess_cert_st were * the same. */
760 : if (!hit) { /* else add cert to session */
761 : CRYPTO_add(&s->cert->references, 1, CRYPTO_LOCK_SSL_CERT);
762 : if (s->session->sess_cert != NULL)
763 : ssl_cert_free(s->session->sess_cert);
764 : s->session->sess_cert = s->cert;
765 : } else { /* We have a session id-cache hit, if the *
766 : * session-id has no certificate listed
767 : * against * the 'cert' structure, grab the
768 : * 'old' one * listed against the SSL
769 : * connection */
770 : if (s->session->sess_cert == NULL) {
771 : CRYPTO_add(&s->cert->references, 1, CRYPTO_LOCK_SSL_CERT);
772 : s->session->sess_cert = s->cert;
773 : }
774 : }
775 : # endif
776 :
777 0 : if (s->cert == NULL) {
778 0 : ssl2_return_error(s, SSL2_PE_NO_CERTIFICATE);
779 0 : SSLerr(SSL_F_SERVER_HELLO, SSL_R_NO_CERTIFICATE_SPECIFIED);
780 0 : return (-1);
781 : }
782 :
783 0 : if (hit) {
784 0 : *(p++) = 0; /* no certificate type */
785 0 : s2n(s->version, p); /* version */
786 0 : s2n(0, p); /* cert len */
787 0 : s2n(0, p); /* ciphers len */
788 : } else {
789 : /* EAY EAY */
790 : /* put certificate type */
791 0 : *(p++) = SSL2_CT_X509_CERTIFICATE;
792 0 : s2n(s->version, p); /* version */
793 0 : n = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, NULL);
794 0 : s2n(n, p); /* certificate length */
795 0 : i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, &d);
796 : n = 0;
797 :
798 : /*
799 : * lets send out the ciphers we like in the prefered order
800 : */
801 0 : n = ssl_cipher_list_to_bytes(s, s->session->ciphers, d, 0);
802 0 : d += n;
803 0 : s2n(n, p); /* add cipher length */
804 : }
805 :
806 : /* make and send conn_id */
807 0 : s2n(SSL2_CONNECTION_ID_LENGTH, p); /* add conn_id length */
808 0 : s->s2->conn_id_length = SSL2_CONNECTION_ID_LENGTH;
809 0 : if (RAND_pseudo_bytes(s->s2->conn_id, (int)s->s2->conn_id_length) <=
810 : 0)
811 : return -1;
812 0 : memcpy(d, s->s2->conn_id, SSL2_CONNECTION_ID_LENGTH);
813 0 : d += SSL2_CONNECTION_ID_LENGTH;
814 :
815 0 : s->state = SSL2_ST_SEND_SERVER_HELLO_B;
816 0 : s->init_num = d - (unsigned char *)s->init_buf->data;
817 0 : s->init_off = 0;
818 : }
819 : /* SSL2_ST_SEND_SERVER_HELLO_B */
820 : /*
821 : * If we are using TCP/IP, the performance is bad if we do 2 writes
822 : * without a read between them. This occurs when Session-id reuse is
823 : * used, so I will put in a buffering module
824 : */
825 0 : if (s->hit) {
826 0 : if (!ssl_init_wbio_buffer(s, 1))
827 : return (-1);
828 : }
829 :
830 0 : return (ssl2_do_write(s));
831 : }
832 :
833 0 : static int get_client_finished(SSL *s)
834 : {
835 : unsigned char *p;
836 : int i, n;
837 : unsigned long len;
838 :
839 0 : p = (unsigned char *)s->init_buf->data;
840 0 : if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A) {
841 0 : i = ssl2_read(s, (char *)&(p[s->init_num]), 1 - s->init_num);
842 0 : if (i < 1 - s->init_num)
843 0 : return (ssl2_part_read(s, SSL_F_GET_CLIENT_FINISHED, i));
844 0 : s->init_num += i;
845 :
846 0 : if (*p != SSL2_MT_CLIENT_FINISHED) {
847 0 : if (*p != SSL2_MT_ERROR) {
848 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
849 0 : SSLerr(SSL_F_GET_CLIENT_FINISHED,
850 : SSL_R_READ_WRONG_PACKET_TYPE);
851 : } else {
852 0 : SSLerr(SSL_F_GET_CLIENT_FINISHED, SSL_R_PEER_ERROR);
853 : /* try to read the error message */
854 0 : i = ssl2_read(s, (char *)&(p[s->init_num]), 3 - s->init_num);
855 0 : return ssl2_part_read(s, SSL_F_GET_SERVER_VERIFY, i);
856 : }
857 0 : return (-1);
858 : }
859 0 : s->state = SSL2_ST_GET_CLIENT_FINISHED_B;
860 : }
861 :
862 : /* SSL2_ST_GET_CLIENT_FINISHED_B */
863 0 : if (s->s2->conn_id_length > sizeof s->s2->conn_id) {
864 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
865 0 : SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
866 0 : return -1;
867 : }
868 0 : len = 1 + (unsigned long)s->s2->conn_id_length;
869 0 : n = (int)len - s->init_num;
870 0 : i = ssl2_read(s, (char *)&(p[s->init_num]), n);
871 0 : if (i < n) {
872 0 : return (ssl2_part_read(s, SSL_F_GET_CLIENT_FINISHED, i));
873 : }
874 0 : if (s->msg_callback) {
875 : /* CLIENT-FINISHED */
876 0 : s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg);
877 : }
878 0 : p += 1;
879 0 : if (memcmp(p, s->s2->conn_id, s->s2->conn_id_length) != 0) {
880 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
881 0 : SSLerr(SSL_F_GET_CLIENT_FINISHED, SSL_R_CONNECTION_ID_IS_DIFFERENT);
882 0 : return (-1);
883 : }
884 : return (1);
885 : }
886 :
887 0 : static int server_verify(SSL *s)
888 : {
889 : unsigned char *p;
890 :
891 0 : if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A) {
892 0 : p = (unsigned char *)s->init_buf->data;
893 0 : *(p++) = SSL2_MT_SERVER_VERIFY;
894 0 : if (s->s2->challenge_length > sizeof s->s2->challenge) {
895 0 : SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);
896 0 : return -1;
897 : }
898 0 : memcpy(p, s->s2->challenge, (unsigned int)s->s2->challenge_length);
899 : /* p+=s->s2->challenge_length; */
900 :
901 0 : s->state = SSL2_ST_SEND_SERVER_VERIFY_B;
902 0 : s->init_num = s->s2->challenge_length + 1;
903 0 : s->init_off = 0;
904 : }
905 0 : return (ssl2_do_write(s));
906 : }
907 :
908 0 : static int server_finish(SSL *s)
909 : {
910 : unsigned char *p;
911 :
912 0 : if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A) {
913 0 : p = (unsigned char *)s->init_buf->data;
914 0 : *(p++) = SSL2_MT_SERVER_FINISHED;
915 :
916 0 : if (s->session->session_id_length > sizeof s->session->session_id) {
917 0 : SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);
918 0 : return -1;
919 : }
920 0 : memcpy(p, s->session->session_id,
921 : (unsigned int)s->session->session_id_length);
922 : /* p+=s->session->session_id_length; */
923 :
924 0 : s->state = SSL2_ST_SEND_SERVER_FINISHED_B;
925 0 : s->init_num = s->session->session_id_length + 1;
926 0 : s->init_off = 0;
927 : }
928 :
929 : /* SSL2_ST_SEND_SERVER_FINISHED_B */
930 0 : return (ssl2_do_write(s));
931 : }
932 :
933 : /* send the request and check the response */
934 0 : static int request_certificate(SSL *s)
935 : {
936 : const unsigned char *cp;
937 : unsigned char *p, *p2, *buf2;
938 : unsigned char *ccd;
939 : int i, j, ctype, ret = -1;
940 : unsigned long len;
941 : X509 *x509 = NULL;
942 : STACK_OF(X509) *sk = NULL;
943 :
944 0 : ccd = s->s2->tmp.ccl;
945 0 : if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A) {
946 0 : p = (unsigned char *)s->init_buf->data;
947 0 : *(p++) = SSL2_MT_REQUEST_CERTIFICATE;
948 0 : *(p++) = SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
949 0 : if (RAND_pseudo_bytes(ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)
950 : return -1;
951 : memcpy(p, ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH);
952 :
953 0 : s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
954 0 : s->init_num = SSL2_MIN_CERT_CHALLENGE_LENGTH + 2;
955 0 : s->init_off = 0;
956 : }
957 :
958 0 : if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B) {
959 0 : i = ssl2_do_write(s);
960 0 : if (i <= 0) {
961 : ret = i;
962 : goto end;
963 : }
964 :
965 0 : s->init_num = 0;
966 0 : s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
967 : }
968 :
969 0 : if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C) {
970 0 : p = (unsigned char *)s->init_buf->data;
971 : /* try to read 6 octets ... */
972 0 : i = ssl2_read(s, (char *)&(p[s->init_num]), 6 - s->init_num);
973 : /*
974 : * ... but don't call ssl2_part_read now if we got at least 3
975 : * (probably NO-CERTIFICATE-ERROR)
976 : */
977 0 : if (i < 3 - s->init_num) {
978 0 : ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, i);
979 0 : goto end;
980 : }
981 0 : s->init_num += i;
982 :
983 0 : if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR)) {
984 0 : n2s(p, i);
985 0 : if (i != SSL2_PE_NO_CERTIFICATE) {
986 : /*
987 : * not the error message we expected -- let ssl2_part_read
988 : * handle it
989 : */
990 0 : s->init_num -= 3;
991 0 : ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, 3);
992 0 : goto end;
993 : }
994 :
995 0 : if (s->msg_callback) {
996 : /* ERROR */
997 0 : s->msg_callback(0, s->version, 0, p, 3, s,
998 : s->msg_callback_arg);
999 : }
1000 :
1001 : /*
1002 : * this is the one place where we can recover from an SSL 2.0
1003 : * error
1004 : */
1005 :
1006 0 : if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
1007 0 : ssl2_return_error(s, SSL2_PE_BAD_CERTIFICATE);
1008 0 : SSLerr(SSL_F_REQUEST_CERTIFICATE,
1009 : SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1010 0 : goto end;
1011 : }
1012 : ret = 1;
1013 : goto end;
1014 : }
1015 0 : if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6)) {
1016 0 : ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
1017 0 : SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_SHORT_READ);
1018 0 : goto end;
1019 : }
1020 0 : if (s->init_num != 6) {
1021 0 : SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1022 0 : goto end;
1023 : }
1024 :
1025 : /* ok we have a response */
1026 : /* certificate type, there is only one right now. */
1027 0 : ctype = *(p++);
1028 0 : if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION) {
1029 0 : ssl2_return_error(s, SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
1030 0 : SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_BAD_RESPONSE_ARGUMENT);
1031 0 : goto end;
1032 : }
1033 0 : n2s(p, i);
1034 0 : s->s2->tmp.clen = i;
1035 0 : n2s(p, i);
1036 0 : s->s2->tmp.rlen = i;
1037 0 : s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
1038 : }
1039 :
1040 : /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
1041 0 : p = (unsigned char *)s->init_buf->data;
1042 0 : len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen;
1043 0 : if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) {
1044 0 : SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_MESSAGE_TOO_LONG);
1045 0 : goto end;
1046 : }
1047 0 : j = (int)len - s->init_num;
1048 0 : i = ssl2_read(s, (char *)&(p[s->init_num]), j);
1049 0 : if (i < j) {
1050 0 : ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, i);
1051 0 : goto end;
1052 : }
1053 0 : if (s->msg_callback) {
1054 : /* CLIENT-CERTIFICATE */
1055 0 : s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg);
1056 : }
1057 0 : p += 6;
1058 :
1059 0 : cp = p;
1060 0 : x509 = (X509 *)d2i_X509(NULL, &cp, (long)s->s2->tmp.clen);
1061 0 : if (x509 == NULL) {
1062 0 : SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_X509_LIB);
1063 0 : goto msg_end;
1064 : }
1065 :
1066 0 : if (((sk = sk_X509_new_null()) == NULL) || (!sk_X509_push(sk, x509))) {
1067 0 : SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1068 0 : goto msg_end;
1069 : }
1070 :
1071 0 : i = ssl_verify_cert_chain(s, sk);
1072 :
1073 0 : if (i > 0) { /* we like the packet, now check the chksum */
1074 : EVP_MD_CTX ctx;
1075 : EVP_PKEY *pkey = NULL;
1076 :
1077 0 : EVP_MD_CTX_init(&ctx);
1078 0 : if (!EVP_VerifyInit_ex(&ctx, s->ctx->rsa_md5, NULL)
1079 0 : || !EVP_VerifyUpdate(&ctx, s->s2->key_material,
1080 : s->s2->key_material_length)
1081 0 : || !EVP_VerifyUpdate(&ctx, ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH))
1082 : goto msg_end;
1083 :
1084 0 : i = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, NULL);
1085 0 : buf2 = OPENSSL_malloc((unsigned int)i);
1086 0 : if (buf2 == NULL) {
1087 0 : SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1088 0 : goto msg_end;
1089 : }
1090 0 : p2 = buf2;
1091 0 : i = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, &p2);
1092 0 : if (!EVP_VerifyUpdate(&ctx, buf2, (unsigned int)i)) {
1093 0 : OPENSSL_free(buf2);
1094 0 : goto msg_end;
1095 : }
1096 0 : OPENSSL_free(buf2);
1097 :
1098 0 : pkey = X509_get_pubkey(x509);
1099 0 : if (pkey == NULL)
1100 : goto end;
1101 0 : i = EVP_VerifyFinal(&ctx, cp, s->s2->tmp.rlen, pkey);
1102 0 : EVP_PKEY_free(pkey);
1103 0 : EVP_MD_CTX_cleanup(&ctx);
1104 :
1105 0 : if (i > 0) {
1106 0 : if (s->session->peer != NULL)
1107 0 : X509_free(s->session->peer);
1108 0 : s->session->peer = x509;
1109 0 : CRYPTO_add(&x509->references, 1, CRYPTO_LOCK_X509);
1110 0 : s->session->verify_result = s->verify_result;
1111 : ret = 1;
1112 0 : goto end;
1113 : } else {
1114 0 : SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_BAD_CHECKSUM);
1115 0 : goto msg_end;
1116 : }
1117 : } else {
1118 : msg_end:
1119 0 : ssl2_return_error(s, SSL2_PE_BAD_CERTIFICATE);
1120 : }
1121 : end:
1122 0 : sk_X509_free(sk);
1123 0 : X509_free(x509);
1124 0 : return (ret);
1125 : }
1126 :
1127 0 : static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
1128 : unsigned char *to, int padding)
1129 : {
1130 : RSA *rsa;
1131 : int i;
1132 :
1133 0 : if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)) {
1134 0 : SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, SSL_R_NO_PRIVATEKEY);
1135 0 : return (-1);
1136 : }
1137 0 : if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA) {
1138 0 : SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1139 0 : return (-1);
1140 : }
1141 0 : rsa = c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
1142 :
1143 : /* we have the public key */
1144 0 : i = RSA_private_decrypt(len, from, to, rsa, padding);
1145 0 : if (i < 0)
1146 0 : SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, ERR_R_RSA_LIB);
1147 0 : return (i);
1148 : }
1149 : #else /* !OPENSSL_NO_SSL2 */
1150 :
1151 : # if PEDANTIC
1152 : static void *dummy = &dummy;
1153 : # endif
1154 :
1155 : #endif
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