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56276539 SS |
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. | |
9eaaad39 | 8 | * |
56276539 SS |
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). | |
9eaaad39 | 15 | * |
56276539 SS |
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. | |
9eaaad39 | 22 | * |
56276539 SS |
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 :-). | |
9eaaad39 | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
56276539 SS |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
9eaaad39 | 40 | * |
56276539 SS |
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. | |
9eaaad39 | 52 | * |
56276539 SS |
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 | |
9eaaad39 | 66 | * notice, this list of conditions and the following disclaimer. |
56276539 SS |
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 | |
25952ef9 | 114 | #include "../crypto/constant_time_locl.h" |
9eaaad39 SW |
115 | # include <stdio.h> |
116 | # include <openssl/bio.h> | |
117 | # include <openssl/rand.h> | |
118 | # include <openssl/objects.h> | |
119 | # include <openssl/evp.h> | |
56276539 | 120 | |
919b01cc | 121 | static const SSL_METHOD *ssl2_get_server_method(int ver); |
56276539 SS |
122 | static int get_client_master_key(SSL *s); |
123 | static int get_client_hello(SSL *s); | |
9eaaad39 | 124 | static int server_hello(SSL *s); |
56276539 SS |
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, | |
9eaaad39 SW |
130 | unsigned char *to, int padding); |
131 | # define BREAK break | |
56276539 | 132 | |
919b01cc | 133 | static const SSL_METHOD *ssl2_get_server_method(int ver) |
9eaaad39 SW |
134 | { |
135 | if (ver == SSL2_VERSION) | |
136 | return (SSLv2_server_method()); | |
137 | else | |
138 | return (NULL); | |
139 | } | |
56276539 | 140 | |
5bd86ce5 | 141 | IMPLEMENT_ssl2_meth_func(SSLv2_server_method, |
9eaaad39 SW |
142 | ssl2_accept, |
143 | ssl_undefined_function, ssl2_get_server_method) | |
56276539 SS |
144 | |
145 | int ssl2_accept(SSL *s) | |
9eaaad39 SW |
146 | { |
147 | 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 | RAND_add(&l, sizeof(l), 0); | |
155 | ERR_clear_error(); | |
156 | clear_sys_error(); | |
157 | ||
158 | if (s->info_callback != NULL) | |
159 | cb = s->info_callback; | |
160 | else if (s->ctx->info_callback != NULL) | |
161 | cb = s->ctx->info_callback; | |
162 | ||
163 | /* init things to blank */ | |
164 | s->in_handshake++; | |
165 | if (!SSL_in_init(s) || SSL_in_before(s)) | |
166 | SSL_clear(s); | |
167 | ||
168 | if (s->cert == NULL) { | |
169 | SSLerr(SSL_F_SSL2_ACCEPT, SSL_R_NO_CERTIFICATE_SET); | |
170 | return (-1); | |
171 | } | |
172 | ||
173 | clear_sys_error(); | |
174 | for (;;) { | |
175 | state = s->state; | |
176 | ||
177 | 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 | s->server = 1; | |
184 | if (cb != NULL) | |
185 | cb(s, SSL_CB_HANDSHAKE_START, 1); | |
186 | ||
187 | s->version = SSL2_VERSION; | |
188 | s->type = SSL_ST_ACCEPT; | |
189 | ||
190 | if (s->init_buf == NULL) { | |
191 | if ((buf = BUF_MEM_new()) == NULL) { | |
192 | ret = -1; | |
193 | goto end; | |
194 | } | |
195 | if (!BUF_MEM_grow | |
196 | (buf, (int)SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) { | |
197 | BUF_MEM_free(buf); | |
198 | ret = -1; | |
199 | goto end; | |
200 | } | |
201 | s->init_buf = buf; | |
202 | } | |
203 | s->init_num = 0; | |
204 | s->ctx->stats.sess_accept++; | |
205 | s->handshake_func = ssl2_accept; | |
206 | s->state = SSL2_ST_GET_CLIENT_HELLO_A; | |
207 | 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 | s->shutdown = 0; | |
213 | ret = get_client_hello(s); | |
214 | if (ret <= 0) | |
215 | goto end; | |
216 | s->init_num = 0; | |
217 | s->state = SSL2_ST_SEND_SERVER_HELLO_A; | |
218 | BREAK; | |
219 | ||
220 | case SSL2_ST_SEND_SERVER_HELLO_A: | |
221 | case SSL2_ST_SEND_SERVER_HELLO_B: | |
222 | ret = server_hello(s); | |
223 | if (ret <= 0) | |
224 | goto end; | |
225 | s->init_num = 0; | |
226 | if (!s->hit) { | |
227 | s->state = SSL2_ST_GET_CLIENT_MASTER_KEY_A; | |
228 | BREAK; | |
229 | } else { | |
230 | s->state = SSL2_ST_SERVER_START_ENCRYPTION; | |
231 | BREAK; | |
232 | } | |
233 | case SSL2_ST_GET_CLIENT_MASTER_KEY_A: | |
234 | case SSL2_ST_GET_CLIENT_MASTER_KEY_B: | |
235 | ret = get_client_master_key(s); | |
236 | if (ret <= 0) | |
237 | goto end; | |
238 | s->init_num = 0; | |
239 | s->state = SSL2_ST_SERVER_START_ENCRYPTION; | |
240 | 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 | if (!ssl2_enc_init(s, 0)) { | |
248 | ret = -1; | |
249 | goto end; | |
250 | } | |
251 | s->s2->clear_text = 0; | |
252 | s->state = SSL2_ST_SEND_SERVER_VERIFY_A; | |
253 | BREAK; | |
254 | ||
255 | case SSL2_ST_SEND_SERVER_VERIFY_A: | |
256 | case SSL2_ST_SEND_SERVER_VERIFY_B: | |
257 | ret = server_verify(s); | |
258 | if (ret <= 0) | |
259 | goto end; | |
260 | s->init_num = 0; | |
261 | 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 | s->state = SSL2_ST_SEND_SERVER_VERIFY_C; | |
268 | BREAK; | |
269 | } else { | |
270 | s->state = SSL2_ST_GET_CLIENT_FINISHED_A; | |
271 | break; | |
272 | } | |
273 | ||
274 | case SSL2_ST_SEND_SERVER_VERIFY_C: | |
275 | /* get the number of bytes to write */ | |
276 | num1 = BIO_ctrl(s->wbio, BIO_CTRL_INFO, 0, NULL); | |
277 | if (num1 > 0) { | |
278 | s->rwstate = SSL_WRITING; | |
279 | num1 = BIO_flush(s->wbio); | |
280 | if (num1 <= 0) { | |
281 | ret = -1; | |
282 | goto end; | |
283 | } | |
284 | s->rwstate = SSL_NOTHING; | |
285 | } | |
286 | ||
287 | /* flushed and now remove buffering */ | |
288 | s->wbio = BIO_pop(s->wbio); | |
289 | ||
290 | s->state = SSL2_ST_GET_CLIENT_FINISHED_A; | |
291 | BREAK; | |
292 | ||
293 | case SSL2_ST_GET_CLIENT_FINISHED_A: | |
294 | case SSL2_ST_GET_CLIENT_FINISHED_B: | |
295 | ret = get_client_finished(s); | |
296 | if (ret <= 0) | |
297 | goto end; | |
298 | s->init_num = 0; | |
299 | s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_A; | |
300 | 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 | if (!(s->verify_mode & SSL_VERIFY_PEER) || | |
311 | ((s->session->peer != NULL) && | |
312 | (s->verify_mode & SSL_VERIFY_CLIENT_ONCE))) { | |
313 | s->state = SSL2_ST_SEND_SERVER_FINISHED_A; | |
314 | break; | |
315 | } else { | |
316 | ret = request_certificate(s); | |
317 | if (ret <= 0) | |
318 | goto end; | |
319 | s->init_num = 0; | |
320 | s->state = SSL2_ST_SEND_SERVER_FINISHED_A; | |
321 | } | |
322 | BREAK; | |
323 | ||
324 | case SSL2_ST_SEND_SERVER_FINISHED_A: | |
325 | case SSL2_ST_SEND_SERVER_FINISHED_B: | |
326 | ret = server_finish(s); | |
327 | if (ret <= 0) | |
328 | goto end; | |
329 | s->init_num = 0; | |
330 | s->state = SSL_ST_OK; | |
331 | break; | |
332 | ||
333 | case SSL_ST_OK: | |
334 | BUF_MEM_free(s->init_buf); | |
335 | ssl_free_wbio_buffer(s); | |
336 | s->init_buf = NULL; | |
337 | s->init_num = 0; | |
338 | /* ERR_clear_error(); */ | |
339 | ||
340 | ssl_update_cache(s, SSL_SESS_CACHE_SERVER); | |
341 | ||
342 | s->ctx->stats.sess_accept_good++; | |
343 | /* s->server=1; */ | |
344 | ret = 1; | |
345 | ||
346 | if (cb != NULL) | |
347 | cb(s, SSL_CB_HANDSHAKE_DONE, 1); | |
348 | ||
349 | goto end; | |
350 | /* BREAK; */ | |
351 | ||
352 | default: | |
353 | SSLerr(SSL_F_SSL2_ACCEPT, SSL_R_UNKNOWN_STATE); | |
354 | ret = -1; | |
355 | goto end; | |
356 | /* BREAK; */ | |
357 | } | |
358 | ||
359 | if ((cb != NULL) && (s->state != state)) { | |
360 | new_state = s->state; | |
361 | s->state = state; | |
362 | cb(s, SSL_CB_ACCEPT_LOOP, 1); | |
363 | s->state = new_state; | |
364 | } | |
365 | } | |
366 | end: | |
367 | s->in_handshake--; | |
368 | if (cb != NULL) | |
369 | cb(s, SSL_CB_ACCEPT_EXIT, ret); | |
370 | return (ret); | |
371 | } | |
56276539 SS |
372 | |
373 | static int get_client_master_key(SSL *s) | |
9eaaad39 SW |
374 | { |
375 | int is_export, i, n, keya; | |
25952ef9 | 376 | unsigned int num_encrypted_key_bytes, key_length; |
9eaaad39 SW |
377 | unsigned long len; |
378 | unsigned char *p; | |
379 | const SSL_CIPHER *cp; | |
380 | const EVP_CIPHER *c; | |
381 | const EVP_MD *md; | |
25952ef9 SW |
382 | unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH]; |
383 | unsigned char decrypt_good; | |
384 | size_t j; | |
9eaaad39 SW |
385 | |
386 | p = (unsigned char *)s->init_buf->data; | |
387 | if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A) { | |
388 | i = ssl2_read(s, (char *)&(p[s->init_num]), 10 - s->init_num); | |
389 | ||
390 | if (i < (10 - s->init_num)) | |
391 | return (ssl2_part_read(s, SSL_F_GET_CLIENT_MASTER_KEY, i)); | |
392 | s->init_num = 10; | |
393 | ||
394 | if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY) { | |
395 | if (p[-1] != SSL2_MT_ERROR) { | |
396 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
397 | SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, | |
398 | SSL_R_READ_WRONG_PACKET_TYPE); | |
399 | } else | |
400 | SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR); | |
401 | return (-1); | |
402 | } | |
403 | ||
404 | cp = ssl2_get_cipher_by_char(p); | |
405 | if (cp == NULL) { | |
406 | ssl2_return_error(s, SSL2_PE_NO_CIPHER); | |
407 | SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH); | |
408 | return (-1); | |
409 | } | |
410 | s->session->cipher = cp; | |
411 | ||
412 | p += 3; | |
413 | n2s(p, i); | |
414 | s->s2->tmp.clear = i; | |
415 | n2s(p, i); | |
416 | s->s2->tmp.enc = i; | |
417 | n2s(p, i); | |
418 | if (i > SSL_MAX_KEY_ARG_LENGTH) { | |
419 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
420 | SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG); | |
421 | return -1; | |
422 | } | |
423 | s->session->key_arg_length = i; | |
424 | s->state = SSL2_ST_GET_CLIENT_MASTER_KEY_B; | |
425 | } | |
426 | ||
427 | /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */ | |
428 | p = (unsigned char *)s->init_buf->data; | |
429 | if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) { | |
430 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
431 | SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR); | |
432 | return -1; | |
433 | } | |
434 | keya = s->session->key_arg_length; | |
435 | len = | |
436 | 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc + | |
437 | (unsigned long)keya; | |
438 | if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) { | |
439 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
440 | SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_MESSAGE_TOO_LONG); | |
441 | return -1; | |
442 | } | |
443 | n = (int)len - s->init_num; | |
444 | i = ssl2_read(s, (char *)&(p[s->init_num]), n); | |
445 | if (i != n) | |
446 | return (ssl2_part_read(s, SSL_F_GET_CLIENT_MASTER_KEY, i)); | |
447 | if (s->msg_callback) { | |
448 | /* CLIENT-MASTER-KEY */ | |
449 | s->msg_callback(0, s->version, 0, p, (size_t)len, s, | |
450 | s->msg_callback_arg); | |
451 | } | |
452 | p += 10; | |
453 | ||
454 | memcpy(s->session->key_arg, &(p[s->s2->tmp.clear + s->s2->tmp.enc]), | |
455 | (unsigned int)keya); | |
456 | ||
457 | if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL) { | |
458 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
459 | SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_PRIVATEKEY); | |
460 | return (-1); | |
461 | } | |
462 | ||
463 | is_export = SSL_C_IS_EXPORT(s->session->cipher); | |
464 | ||
465 | if (!ssl_cipher_get_evp(s->session, &c, &md, NULL, NULL, NULL)) { | |
466 | ssl2_return_error(s, SSL2_PE_NO_CIPHER); | |
467 | SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, | |
468 | SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS); | |
469 | return (0); | |
470 | } | |
471 | ||
9eaaad39 SW |
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 | |
25952ef9 SW |
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). | |
9eaaad39 | 488 | */ |
25952ef9 SW |
489 | key_length = (unsigned int)EVP_CIPHER_key_length(c); |
490 | if (key_length > SSL_MAX_MASTER_KEY_LENGTH) { | |
491 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
492 | SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR); | |
493 | return -1; | |
494 | } | |
495 | ||
496 | if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC) { | |
497 | is_export = 1; | |
498 | num_encrypted_key_bytes = 8; | |
499 | } else if (is_export) { | |
500 | num_encrypted_key_bytes = 5; | |
501 | } else { | |
502 | num_encrypted_key_bytes = key_length; | |
503 | } | |
504 | ||
505 | if (s->s2->tmp.clear + num_encrypted_key_bytes != key_length) { | |
9eaaad39 SW |
506 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); |
507 | SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_LENGTH); | |
508 | 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 | */ | |
25952ef9 | 515 | if (s->s2->tmp.enc < num_encrypted_key_bytes) { |
9eaaad39 SW |
516 | ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); |
517 | SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_LENGTH_TOO_SHORT); | |
518 | return -1; | |
519 | } | |
520 | ||
25952ef9 SW |
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 | if (RAND_pseudo_bytes(rand_premaster_secret, | |
533 | (int)num_encrypted_key_bytes) <= 0) | |
534 | return 0; | |
535 | ||
9eaaad39 SW |
536 | i = ssl_rsa_private_decrypt(s->cert, s->s2->tmp.enc, |
537 | &(p[s->s2->tmp.clear]), | |
538 | &(p[s->s2->tmp.clear]), | |
539 | (s->s2->ssl2_rollback) ? RSA_SSLV23_PADDING : | |
540 | RSA_PKCS1_PADDING); | |
25952ef9 | 541 | ERR_clear_error(); |
9eaaad39 SW |
542 | /* |
543 | * If a bad decrypt, continue with protocol but with a random master | |
544 | * secret (Bleichenbacher attack) | |
545 | */ | |
25952ef9 SW |
546 | decrypt_good = constant_time_eq_int_8(i, (int)num_encrypted_key_bytes); |
547 | for (j = 0; j < num_encrypted_key_bytes; j++) { | |
548 | p[s->s2->tmp.clear + j] = | |
549 | constant_time_select_8(decrypt_good, p[s->s2->tmp.clear + j], | |
550 | rand_premaster_secret[j]); | |
9eaaad39 | 551 | } |
56276539 | 552 | |
25952ef9 SW |
553 | s->session->master_key_length = (int)key_length; |
554 | memcpy(s->session->master_key, p, key_length); | |
555 | OPENSSL_cleanse(p, key_length); | |
56276539 | 556 | |
25952ef9 | 557 | return 1; |
9eaaad39 | 558 | } |
56276539 SS |
559 | |
560 | static int get_client_hello(SSL *s) | |
9eaaad39 SW |
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 | if (s->state == SSL2_ST_GET_CLIENT_HELLO_A) { | |
575 | s->first_packet = 1; | |
576 | s->state = SSL2_ST_GET_CLIENT_HELLO_B; | |
577 | } | |
578 | ||
579 | p = (unsigned char *)s->init_buf->data; | |
580 | if (s->state == SSL2_ST_GET_CLIENT_HELLO_B) { | |
581 | i = ssl2_read(s, (char *)&(p[s->init_num]), 9 - s->init_num); | |
582 | if (i < (9 - s->init_num)) | |
583 | return (ssl2_part_read(s, SSL_F_GET_CLIENT_HELLO, i)); | |
584 | s->init_num = 9; | |
585 | ||
586 | if (*(p++) != SSL2_MT_CLIENT_HELLO) { | |
587 | if (p[-1] != SSL2_MT_ERROR) { | |
588 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
589 | SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_READ_WRONG_PACKET_TYPE); | |
590 | } else | |
591 | SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_PEER_ERROR); | |
592 | return (-1); | |
593 | } | |
594 | n2s(p, i); | |
595 | if (i < s->version) | |
596 | s->version = i; | |
597 | n2s(p, i); | |
598 | s->s2->tmp.cipher_spec_length = i; | |
599 | n2s(p, i); | |
600 | s->s2->tmp.session_id_length = i; | |
601 | n2s(p, i); | |
602 | s->s2->challenge_length = i; | |
603 | if ((i < SSL2_MIN_CHALLENGE_LENGTH) || | |
604 | (i > SSL2_MAX_CHALLENGE_LENGTH)) { | |
605 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
606 | SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_INVALID_CHALLENGE_LENGTH); | |
607 | return (-1); | |
608 | } | |
609 | s->state = SSL2_ST_GET_CLIENT_HELLO_C; | |
610 | } | |
611 | ||
612 | /* SSL2_ST_GET_CLIENT_HELLO_C */ | |
613 | p = (unsigned char *)s->init_buf->data; | |
614 | len = | |
615 | 9 + (unsigned long)s->s2->tmp.cipher_spec_length + | |
616 | (unsigned long)s->s2->challenge_length + | |
617 | (unsigned long)s->s2->tmp.session_id_length; | |
618 | if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) { | |
619 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
620 | SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_MESSAGE_TOO_LONG); | |
621 | return -1; | |
622 | } | |
623 | n = (int)len - s->init_num; | |
624 | i = ssl2_read(s, (char *)&(p[s->init_num]), n); | |
625 | if (i != n) | |
626 | return (ssl2_part_read(s, SSL_F_GET_CLIENT_HELLO, i)); | |
627 | if (s->msg_callback) { | |
628 | /* CLIENT-HELLO */ | |
629 | s->msg_callback(0, s->version, 0, p, (size_t)len, s, | |
630 | s->msg_callback_arg); | |
631 | } | |
632 | 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 | if ((s->s2->tmp.session_id_length != 0) && | |
640 | (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH)) { | |
641 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
642 | SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_BAD_SSL_SESSION_ID_LENGTH); | |
643 | return (-1); | |
644 | } | |
645 | ||
646 | if (s->s2->tmp.session_id_length == 0) { | |
647 | if (!ssl_get_new_session(s, 1)) { | |
648 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
649 | return (-1); | |
650 | } | |
651 | } else { | |
652 | i = ssl_get_prev_session(s, &(p[s->s2->tmp.cipher_spec_length]), | |
653 | s->s2->tmp.session_id_length, NULL); | |
654 | if (i == 1) { /* previous session */ | |
655 | s->hit = 1; | |
656 | } else if (i == -1) { | |
657 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
658 | return (-1); | |
659 | } else { | |
660 | if (s->cert == NULL) { | |
661 | ssl2_return_error(s, SSL2_PE_NO_CERTIFICATE); | |
662 | SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_NO_CERTIFICATE_SET); | |
663 | return (-1); | |
664 | } | |
665 | ||
666 | if (!ssl_get_new_session(s, 1)) { | |
667 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
668 | return (-1); | |
669 | } | |
670 | } | |
671 | } | |
672 | ||
673 | if (!s->hit) { | |
674 | cs = ssl_bytes_to_cipher_list(s, p, s->s2->tmp.cipher_spec_length, | |
675 | &s->session->ciphers); | |
676 | if (cs == NULL) | |
677 | goto mem_err; | |
678 | ||
679 | cl = SSL_get_ciphers(s); | |
680 | ||
681 | if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) { | |
682 | prio = sk_SSL_CIPHER_dup(cl); | |
683 | if (prio == NULL) | |
684 | goto mem_err; | |
685 | allow = cs; | |
686 | } else { | |
687 | prio = cs; | |
688 | allow = cl; | |
689 | } | |
690 | for (z = 0; z < sk_SSL_CIPHER_num(prio); z++) { | |
691 | if (sk_SSL_CIPHER_find(allow, sk_SSL_CIPHER_value(prio, z)) < 0) { | |
692 | (void)sk_SSL_CIPHER_delete(prio, z); | |
693 | z--; | |
694 | } | |
695 | } | |
696 | if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) { | |
697 | sk_SSL_CIPHER_free(s->session->ciphers); | |
698 | 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 | p += s->s2->tmp.cipher_spec_length; | |
708 | /* done cipher selection */ | |
709 | ||
710 | /* session id extracted already */ | |
711 | p += s->s2->tmp.session_id_length; | |
712 | ||
713 | /* challenge */ | |
714 | if (s->s2->challenge_length > sizeof s->s2->challenge) { | |
715 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
716 | SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); | |
717 | return -1; | |
718 | } | |
719 | memcpy(s->s2->challenge, p, (unsigned int)s->s2->challenge_length); | |
720 | return (1); | |
721 | mem_err: | |
722 | SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_MALLOC_FAILURE); | |
723 | return (0); | |
724 | } | |
56276539 SS |
725 | |
726 | static int server_hello(SSL *s) | |
9eaaad39 SW |
727 | { |
728 | unsigned char *p, *d; | |
729 | int n, hit; | |
730 | ||
731 | p = (unsigned char *)s->init_buf->data; | |
732 | if (s->state == SSL2_ST_SEND_SERVER_HELLO_A) { | |
733 | d = p + 11; | |
734 | *(p++) = SSL2_MT_SERVER_HELLO; /* type */ | |
735 | hit = s->hit; | |
736 | *(p++) = (unsigned char)hit; | |
737 | # if 1 | |
738 | if (!hit) { | |
739 | 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 | ssl_sess_cert_free(s->session->sess_cert); | |
745 | s->session->sess_cert = ssl_sess_cert_new(); | |
746 | if (s->session->sess_cert == NULL) { | |
747 | SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE); | |
748 | 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 | |
56276539 | 776 | |
9eaaad39 SW |
777 | if (s->cert == NULL) { |
778 | ssl2_return_error(s, SSL2_PE_NO_CERTIFICATE); | |
779 | SSLerr(SSL_F_SERVER_HELLO, SSL_R_NO_CERTIFICATE_SPECIFIED); | |
780 | return (-1); | |
781 | } | |
782 | ||
783 | if (hit) { | |
784 | *(p++) = 0; /* no certificate type */ | |
785 | s2n(s->version, p); /* version */ | |
786 | s2n(0, p); /* cert len */ | |
787 | s2n(0, p); /* ciphers len */ | |
788 | } else { | |
789 | /* EAY EAY */ | |
790 | /* put certificate type */ | |
791 | *(p++) = SSL2_CT_X509_CERTIFICATE; | |
792 | s2n(s->version, p); /* version */ | |
793 | n = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, NULL); | |
794 | s2n(n, p); /* certificate length */ | |
795 | 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 | n = ssl_cipher_list_to_bytes(s, s->session->ciphers, d, 0); | |
802 | d += n; | |
803 | s2n(n, p); /* add cipher length */ | |
804 | } | |
805 | ||
806 | /* make and send conn_id */ | |
807 | s2n(SSL2_CONNECTION_ID_LENGTH, p); /* add conn_id length */ | |
808 | s->s2->conn_id_length = SSL2_CONNECTION_ID_LENGTH; | |
809 | if (RAND_pseudo_bytes(s->s2->conn_id, (int)s->s2->conn_id_length) <= | |
810 | 0) | |
811 | return -1; | |
812 | memcpy(d, s->s2->conn_id, SSL2_CONNECTION_ID_LENGTH); | |
813 | d += SSL2_CONNECTION_ID_LENGTH; | |
814 | ||
815 | s->state = SSL2_ST_SEND_SERVER_HELLO_B; | |
816 | s->init_num = d - (unsigned char *)s->init_buf->data; | |
817 | 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 | if (s->hit) { | |
826 | if (!ssl_init_wbio_buffer(s, 1)) | |
827 | return (-1); | |
828 | } | |
829 | ||
830 | return (ssl2_do_write(s)); | |
831 | } | |
56276539 SS |
832 | |
833 | static int get_client_finished(SSL *s) | |
9eaaad39 SW |
834 | { |
835 | unsigned char *p; | |
836 | int i, n; | |
837 | unsigned long len; | |
838 | ||
839 | p = (unsigned char *)s->init_buf->data; | |
840 | if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A) { | |
841 | i = ssl2_read(s, (char *)&(p[s->init_num]), 1 - s->init_num); | |
842 | if (i < 1 - s->init_num) | |
843 | return (ssl2_part_read(s, SSL_F_GET_CLIENT_FINISHED, i)); | |
844 | s->init_num += i; | |
845 | ||
846 | if (*p != SSL2_MT_CLIENT_FINISHED) { | |
847 | if (*p != SSL2_MT_ERROR) { | |
848 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
849 | SSLerr(SSL_F_GET_CLIENT_FINISHED, | |
850 | SSL_R_READ_WRONG_PACKET_TYPE); | |
851 | } else { | |
852 | SSLerr(SSL_F_GET_CLIENT_FINISHED, SSL_R_PEER_ERROR); | |
853 | /* try to read the error message */ | |
854 | i = ssl2_read(s, (char *)&(p[s->init_num]), 3 - s->init_num); | |
855 | return ssl2_part_read(s, SSL_F_GET_SERVER_VERIFY, i); | |
856 | } | |
857 | return (-1); | |
858 | } | |
859 | s->state = SSL2_ST_GET_CLIENT_FINISHED_B; | |
860 | } | |
861 | ||
862 | /* SSL2_ST_GET_CLIENT_FINISHED_B */ | |
863 | if (s->s2->conn_id_length > sizeof s->s2->conn_id) { | |
864 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
865 | SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR); | |
866 | return -1; | |
867 | } | |
868 | len = 1 + (unsigned long)s->s2->conn_id_length; | |
869 | n = (int)len - s->init_num; | |
870 | i = ssl2_read(s, (char *)&(p[s->init_num]), n); | |
871 | if (i < n) { | |
872 | return (ssl2_part_read(s, SSL_F_GET_CLIENT_FINISHED, i)); | |
873 | } | |
874 | if (s->msg_callback) { | |
875 | /* CLIENT-FINISHED */ | |
876 | s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); | |
877 | } | |
878 | p += 1; | |
879 | if (memcmp(p, s->s2->conn_id, s->s2->conn_id_length) != 0) { | |
880 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
881 | SSLerr(SSL_F_GET_CLIENT_FINISHED, SSL_R_CONNECTION_ID_IS_DIFFERENT); | |
882 | return (-1); | |
883 | } | |
884 | return (1); | |
885 | } | |
56276539 SS |
886 | |
887 | static int server_verify(SSL *s) | |
9eaaad39 SW |
888 | { |
889 | unsigned char *p; | |
890 | ||
891 | if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A) { | |
892 | p = (unsigned char *)s->init_buf->data; | |
893 | *(p++) = SSL2_MT_SERVER_VERIFY; | |
894 | if (s->s2->challenge_length > sizeof s->s2->challenge) { | |
895 | SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR); | |
896 | return -1; | |
897 | } | |
898 | memcpy(p, s->s2->challenge, (unsigned int)s->s2->challenge_length); | |
899 | /* p+=s->s2->challenge_length; */ | |
900 | ||
901 | s->state = SSL2_ST_SEND_SERVER_VERIFY_B; | |
902 | s->init_num = s->s2->challenge_length + 1; | |
903 | s->init_off = 0; | |
904 | } | |
905 | return (ssl2_do_write(s)); | |
906 | } | |
56276539 SS |
907 | |
908 | static int server_finish(SSL *s) | |
9eaaad39 SW |
909 | { |
910 | unsigned char *p; | |
911 | ||
912 | if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A) { | |
913 | p = (unsigned char *)s->init_buf->data; | |
914 | *(p++) = SSL2_MT_SERVER_FINISHED; | |
915 | ||
916 | if (s->session->session_id_length > sizeof s->session->session_id) { | |
917 | SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR); | |
918 | return -1; | |
919 | } | |
920 | memcpy(p, s->session->session_id, | |
921 | (unsigned int)s->session->session_id_length); | |
922 | /* p+=s->session->session_id_length; */ | |
923 | ||
924 | s->state = SSL2_ST_SEND_SERVER_FINISHED_B; | |
925 | s->init_num = s->session->session_id_length + 1; | |
926 | s->init_off = 0; | |
927 | } | |
928 | ||
929 | /* SSL2_ST_SEND_SERVER_FINISHED_B */ | |
930 | return (ssl2_do_write(s)); | |
931 | } | |
56276539 SS |
932 | |
933 | /* send the request and check the response */ | |
934 | static int request_certificate(SSL *s) | |
9eaaad39 SW |
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 | ccd = s->s2->tmp.ccl; | |
945 | if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A) { | |
946 | p = (unsigned char *)s->init_buf->data; | |
947 | *(p++) = SSL2_MT_REQUEST_CERTIFICATE; | |
948 | *(p++) = SSL2_AT_MD5_WITH_RSA_ENCRYPTION; | |
949 | 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 | s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_B; | |
954 | s->init_num = SSL2_MIN_CERT_CHALLENGE_LENGTH + 2; | |
955 | s->init_off = 0; | |
956 | } | |
957 | ||
958 | if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B) { | |
959 | i = ssl2_do_write(s); | |
960 | if (i <= 0) { | |
961 | ret = i; | |
962 | goto end; | |
963 | } | |
964 | ||
965 | s->init_num = 0; | |
966 | s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_C; | |
967 | } | |
968 | ||
969 | if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C) { | |
970 | p = (unsigned char *)s->init_buf->data; | |
971 | /* try to read 6 octets ... */ | |
972 | 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 | if (i < 3 - s->init_num) { | |
978 | ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, i); | |
979 | goto end; | |
980 | } | |
981 | s->init_num += i; | |
982 | ||
983 | if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR)) { | |
984 | n2s(p, i); | |
985 | if (i != SSL2_PE_NO_CERTIFICATE) { | |
986 | /* | |
987 | * not the error message we expected -- let ssl2_part_read | |
988 | * handle it | |
989 | */ | |
990 | s->init_num -= 3; | |
991 | ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, 3); | |
992 | goto end; | |
993 | } | |
994 | ||
995 | if (s->msg_callback) { | |
996 | /* ERROR */ | |
997 | 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 | if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) { | |
1007 | ssl2_return_error(s, SSL2_PE_BAD_CERTIFICATE); | |
1008 | SSLerr(SSL_F_REQUEST_CERTIFICATE, | |
1009 | SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); | |
1010 | goto end; | |
1011 | } | |
1012 | ret = 1; | |
1013 | goto end; | |
1014 | } | |
1015 | if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6)) { | |
1016 | ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); | |
1017 | SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_SHORT_READ); | |
1018 | goto end; | |
1019 | } | |
1020 | if (s->init_num != 6) { | |
1021 | SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR); | |
1022 | goto end; | |
1023 | } | |
1024 | ||
1025 | /* ok we have a response */ | |
1026 | /* certificate type, there is only one right now. */ | |
1027 | ctype = *(p++); | |
1028 | if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION) { | |
1029 | ssl2_return_error(s, SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE); | |
1030 | SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_BAD_RESPONSE_ARGUMENT); | |
1031 | goto end; | |
1032 | } | |
1033 | n2s(p, i); | |
1034 | s->s2->tmp.clen = i; | |
1035 | n2s(p, i); | |
1036 | s->s2->tmp.rlen = i; | |
1037 | s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_D; | |
1038 | } | |
1039 | ||
1040 | /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */ | |
1041 | p = (unsigned char *)s->init_buf->data; | |
1042 | len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen; | |
1043 | if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) { | |
1044 | SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_MESSAGE_TOO_LONG); | |
1045 | goto end; | |
1046 | } | |
1047 | j = (int)len - s->init_num; | |
1048 | i = ssl2_read(s, (char *)&(p[s->init_num]), j); | |
1049 | if (i < j) { | |
1050 | ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, i); | |
1051 | goto end; | |
1052 | } | |
1053 | if (s->msg_callback) { | |
1054 | /* CLIENT-CERTIFICATE */ | |
1055 | s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); | |
1056 | } | |
1057 | p += 6; | |
1058 | ||
1059 | cp = p; | |
1060 | x509 = (X509 *)d2i_X509(NULL, &cp, (long)s->s2->tmp.clen); | |
1061 | if (x509 == NULL) { | |
1062 | SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_X509_LIB); | |
1063 | goto msg_end; | |
1064 | } | |
1065 | ||
1066 | if (((sk = sk_X509_new_null()) == NULL) || (!sk_X509_push(sk, x509))) { | |
1067 | SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_MALLOC_FAILURE); | |
1068 | goto msg_end; | |
1069 | } | |
1070 | ||
1071 | i = ssl_verify_cert_chain(s, sk); | |
1072 | ||
1073 | if (i > 0) { /* we like the packet, now check the chksum */ | |
1074 | EVP_MD_CTX ctx; | |
1075 | EVP_PKEY *pkey = NULL; | |
1076 | ||
1077 | EVP_MD_CTX_init(&ctx); | |
1078 | if (!EVP_VerifyInit_ex(&ctx, s->ctx->rsa_md5, NULL) | |
1079 | || !EVP_VerifyUpdate(&ctx, s->s2->key_material, | |
1080 | s->s2->key_material_length) | |
1081 | || !EVP_VerifyUpdate(&ctx, ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH)) | |
1082 | goto msg_end; | |
1083 | ||
1084 | i = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, NULL); | |
1085 | buf2 = OPENSSL_malloc((unsigned int)i); | |
1086 | if (buf2 == NULL) { | |
1087 | SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_MALLOC_FAILURE); | |
1088 | goto msg_end; | |
1089 | } | |
1090 | p2 = buf2; | |
1091 | i = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, &p2); | |
1092 | if (!EVP_VerifyUpdate(&ctx, buf2, (unsigned int)i)) { | |
1093 | OPENSSL_free(buf2); | |
1094 | goto msg_end; | |
1095 | } | |
1096 | OPENSSL_free(buf2); | |
1097 | ||
1098 | pkey = X509_get_pubkey(x509); | |
1099 | if (pkey == NULL) | |
1100 | goto end; | |
1101 | i = EVP_VerifyFinal(&ctx, cp, s->s2->tmp.rlen, pkey); | |
1102 | EVP_PKEY_free(pkey); | |
1103 | EVP_MD_CTX_cleanup(&ctx); | |
1104 | ||
1105 | if (i > 0) { | |
1106 | if (s->session->peer != NULL) | |
1107 | X509_free(s->session->peer); | |
1108 | s->session->peer = x509; | |
1109 | CRYPTO_add(&x509->references, 1, CRYPTO_LOCK_X509); | |
1110 | s->session->verify_result = s->verify_result; | |
1111 | ret = 1; | |
1112 | goto end; | |
1113 | } else { | |
1114 | SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_BAD_CHECKSUM); | |
1115 | goto msg_end; | |
1116 | } | |
1117 | } else { | |
1118 | msg_end: | |
1119 | ssl2_return_error(s, SSL2_PE_BAD_CERTIFICATE); | |
1120 | } | |
1121 | end: | |
1122 | sk_X509_free(sk); | |
1123 | X509_free(x509); | |
1124 | return (ret); | |
1125 | } | |
56276539 SS |
1126 | |
1127 | static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from, | |
9eaaad39 SW |
1128 | unsigned char *to, int padding) |
1129 | { | |
1130 | RSA *rsa; | |
1131 | int i; | |
1132 | ||
1133 | if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)) { | |
1134 | SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, SSL_R_NO_PRIVATEKEY); | |
1135 | return (-1); | |
1136 | } | |
1137 | if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA) { | |
1138 | SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, SSL_R_PUBLIC_KEY_IS_NOT_RSA); | |
1139 | return (-1); | |
1140 | } | |
1141 | rsa = c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa; | |
1142 | ||
1143 | /* we have the public key */ | |
1144 | i = RSA_private_decrypt(len, from, to, rsa, padding); | |
1145 | if (i < 0) | |
1146 | SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, ERR_R_RSA_LIB); | |
1147 | return (i); | |
1148 | } | |
1149 | #else /* !OPENSSL_NO_SSL2 */ | |
56276539 SS |
1150 | |
1151 | # if PEDANTIC | |
9eaaad39 | 1152 | static void *dummy = &dummy; |
56276539 SS |
1153 | # endif |
1154 | ||
1155 | #endif |