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d1_clnt.c
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1 /* ssl/d1_clnt.c */
2 /*
3  * DTLS implementation written by Nagendra Modadugu
4  * ([email protected]) for the OpenSSL project 2005.
5  */
6 /* ====================================================================
7  * Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
18  * the documentation and/or other materials provided with the
19  * distribution.
20  *
21  * 3. All advertising materials mentioning features or use of this
22  * software must display the following acknowledgment:
23  * "This product includes software developed by the OpenSSL Project
24  * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25  *
26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27  * endorse or promote products derived from this software without
28  * prior written permission. For written permission, please contact
29  * [email protected].
30  *
31  * 5. Products derived from this software may not be called "OpenSSL"
32  * nor may "OpenSSL" appear in their names without prior written
33  * permission of the OpenSSL Project.
34  *
35  * 6. Redistributions of any form whatsoever must retain the following
36  * acknowledgment:
37  * "This product includes software developed by the OpenSSL Project
38  * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39  *
40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51  * OF THE POSSIBILITY OF SUCH DAMAGE.
52  * ====================================================================
53  *
54  * This product includes cryptographic software written by Eric Young
55  * ([email protected]). This product includes software written by Tim
56  * Hudson ([email protected]).
57  *
58  */
59 /* Copyright (C) 1995-1998 Eric Young ([email protected])
60  * All rights reserved.
61  *
62  * This package is an SSL implementation written
63  * by Eric Young ([email protected]).
64  * The implementation was written so as to conform with Netscapes SSL.
65  *
66  * This library is free for commercial and non-commercial use as long as
67  * the following conditions are aheared to. The following conditions
68  * apply to all code found in this distribution, be it the RC4, RSA,
69  * lhash, DES, etc., code; not just the SSL code. The SSL documentation
70  * included with this distribution is covered by the same copyright terms
71  * except that the holder is Tim Hudson ([email protected]).
72  *
73  * Copyright remains Eric Young's, and as such any Copyright notices in
74  * the code are not to be removed.
75  * If this package is used in a product, Eric Young should be given attribution
76  * as the author of the parts of the library used.
77  * This can be in the form of a textual message at program startup or
78  * in documentation (online or textual) provided with the package.
79  *
80  * Redistribution and use in source and binary forms, with or without
81  * modification, are permitted provided that the following conditions
82  * are met:
83  * 1. Redistributions of source code must retain the copyright
84  * notice, this list of conditions and the following disclaimer.
85  * 2. Redistributions in binary form must reproduce the above copyright
86  * notice, this list of conditions and the following disclaimer in the
87  * documentation and/or other materials provided with the distribution.
88  * 3. All advertising materials mentioning features or use of this software
89  * must display the following acknowledgement:
90  * "This product includes cryptographic software written by
91  * Eric Young ([email protected])"
92  * The word 'cryptographic' can be left out if the rouines from the library
93  * being used are not cryptographic related :-).
94  * 4. If you include any Windows specific code (or a derivative thereof) from
95  * the apps directory (application code) you must include an acknowledgement:
96  * "This product includes software written by Tim Hudson ([email protected])"
97  *
98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
101  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
108  * SUCH DAMAGE.
109  *
110  * The licence and distribution terms for any publically available version or
111  * derivative of this code cannot be changed. i.e. this code cannot simply be
112  * copied and put under another distribution licence
113  * [including the GNU Public Licence.]
114  */
115 
116 #include <stdio.h>
117 #include "ssl_locl.h"
118 #ifndef OPENSSL_NO_KRB5
119 #include "kssl_lcl.h"
120 #endif
121 #include <openssl/buffer.h>
122 #include <openssl/rand.h>
123 #include <openssl/objects.h>
124 #include <openssl/evp.h>
125 #include <openssl/md5.h>
126 #include <openssl/bn.h>
127 #ifndef OPENSSL_NO_DH
128 #include <openssl/dh.h>
129 #endif
130 
131 static const SSL_METHOD *dtls1_get_client_method(int ver);
132 static int dtls1_get_hello_verify(SSL *s);
133 
134 static const SSL_METHOD *dtls1_get_client_method(int ver)
135  {
136  if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
137  return(DTLSv1_client_method());
138  else
139  return(NULL);
140  }
141 
142 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
143  ssl_undefined_function,
144  dtls1_connect,
145  dtls1_get_client_method)
146 
147 int dtls1_connect(SSL *s)
148  {
149  BUF_MEM *buf=NULL;
150  unsigned long Time=(unsigned long)time(NULL);
151  void (*cb)(const SSL *ssl,int type,int val)=NULL;
152  int ret= -1;
153  int new_state,state,skip=0;
154 #ifndef OPENSSL_NO_SCTP
155  unsigned char sctpauthkey[64];
156  char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
157 #endif
158 
159  RAND_add(&Time,sizeof(Time),0);
160  ERR_clear_error();
161  clear_sys_error();
162 
163  if (s->info_callback != NULL)
164  cb=s->info_callback;
165  else if (s->ctx->info_callback != NULL)
166  cb=s->ctx->info_callback;
167 
168  s->in_handshake++;
169  if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
170 
171 #ifndef OPENSSL_NO_SCTP
172  /* Notify SCTP BIO socket to enter handshake
173  * mode and prevent stream identifier other
174  * than 0. Will be ignored if no SCTP is used.
175  */
176  BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
177 #endif
178 
179 #ifndef OPENSSL_NO_HEARTBEATS
180  /* If we're awaiting a HeartbeatResponse, pretend we
181  * already got and don't await it anymore, because
182  * Heartbeats don't make sense during handshakes anyway.
183  */
184  if (s->tlsext_hb_pending)
185  {
186  dtls1_stop_timer(s);
187  s->tlsext_hb_pending = 0;
188  s->tlsext_hb_seq++;
189  }
190 #endif
191 
192  for (;;)
193  {
194  state=s->state;
195 
196  switch(s->state)
197  {
198  case SSL_ST_RENEGOTIATE:
199  s->renegotiate=1;
200  s->state=SSL_ST_CONNECT;
201  s->ctx->stats.sess_connect_renegotiate++;
202  /* break */
203  case SSL_ST_BEFORE:
204  case SSL_ST_CONNECT:
205  case SSL_ST_BEFORE|SSL_ST_CONNECT:
206  case SSL_ST_OK|SSL_ST_CONNECT:
207 
208  s->server=0;
209  if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
210 
211  if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
212  (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
213  {
214  SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
215  ret = -1;
216  goto end;
217  }
218 
219  /* s->version=SSL3_VERSION; */
220  s->type=SSL_ST_CONNECT;
221 
222  if (s->init_buf == NULL)
223  {
224  if ((buf=BUF_MEM_new()) == NULL)
225  {
226  ret= -1;
227  goto end;
228  }
229  if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
230  {
231  ret= -1;
232  goto end;
233  }
234  s->init_buf=buf;
235  buf=NULL;
236  }
237 
238  if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
239 
240  /* setup buffing BIO */
241  if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
242 
243  /* don't push the buffering BIO quite yet */
244 
245  s->state=SSL3_ST_CW_CLNT_HELLO_A;
246  s->ctx->stats.sess_connect++;
247  s->init_num=0;
248  /* mark client_random uninitialized */
249  memset(s->s3->client_random,0,sizeof(s->s3->client_random));
250  s->d1->send_cookie = 0;
251  s->hit = 0;
252  break;
253 
254 #ifndef OPENSSL_NO_SCTP
255  case DTLS1_SCTP_ST_CR_READ_SOCK:
256 
257  if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
258  {
259  s->s3->in_read_app_data=2;
260  s->rwstate=SSL_READING;
261  BIO_clear_retry_flags(SSL_get_rbio(s));
262  BIO_set_retry_read(SSL_get_rbio(s));
263  ret = -1;
264  goto end;
265  }
266 
267  s->state=s->s3->tmp.next_state;
268  break;
269 
270  case DTLS1_SCTP_ST_CW_WRITE_SOCK:
271  /* read app data until dry event */
272 
273  ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
274  if (ret < 0) goto end;
275 
276  if (ret == 0)
277  {
278  s->s3->in_read_app_data=2;
279  s->rwstate=SSL_READING;
280  BIO_clear_retry_flags(SSL_get_rbio(s));
281  BIO_set_retry_read(SSL_get_rbio(s));
282  ret = -1;
283  goto end;
284  }
285 
286  s->state=s->d1->next_state;
287  break;
288 #endif
289 
290  case SSL3_ST_CW_CLNT_HELLO_A:
291  case SSL3_ST_CW_CLNT_HELLO_B:
292 
293  s->shutdown=0;
294 
295  /* every DTLS ClientHello resets Finished MAC */
296  ssl3_init_finished_mac(s);
297 
298  dtls1_start_timer(s);
299  ret=dtls1_client_hello(s);
300  if (ret <= 0) goto end;
301 
302  if ( s->d1->send_cookie)
303  {
304  s->state=SSL3_ST_CW_FLUSH;
305  s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
306  }
307  else
308  s->state=SSL3_ST_CR_SRVR_HELLO_A;
309 
310  s->init_num=0;
311 
312 #ifndef OPENSSL_NO_SCTP
313  /* Disable buffering for SCTP */
314  if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
315  {
316 #endif
317  /* turn on buffering for the next lot of output */
318  if (s->bbio != s->wbio)
319  s->wbio=BIO_push(s->bbio,s->wbio);
320 #ifndef OPENSSL_NO_SCTP
321  }
322 #endif
323 
324  break;
325 
326  case SSL3_ST_CR_SRVR_HELLO_A:
327  case SSL3_ST_CR_SRVR_HELLO_B:
328  ret=ssl3_get_server_hello(s);
329  if (ret <= 0) goto end;
330  else
331  {
332  if (s->hit)
333  {
334 #ifndef OPENSSL_NO_SCTP
335  /* Add new shared key for SCTP-Auth,
336  * will be ignored if no SCTP used.
337  */
338  snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
339  DTLS1_SCTP_AUTH_LABEL);
340 
341  SSL_export_keying_material(s, sctpauthkey,
342  sizeof(sctpauthkey), labelbuffer,
343  sizeof(labelbuffer), NULL, 0, 0);
344 
345  BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
346  sizeof(sctpauthkey), sctpauthkey);
347 #endif
348 
349  s->state=SSL3_ST_CR_FINISHED_A;
350  }
351  else
352  s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
353  }
354  s->init_num=0;
355  break;
356 
357  case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
358  case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
359 
360  ret = dtls1_get_hello_verify(s);
361  if ( ret <= 0)
362  goto end;
363  dtls1_stop_timer(s);
364  if ( s->d1->send_cookie) /* start again, with a cookie */
365  s->state=SSL3_ST_CW_CLNT_HELLO_A;
366  else
367  s->state = SSL3_ST_CR_CERT_A;
368  s->init_num = 0;
369  break;
370 
371  case SSL3_ST_CR_CERT_A:
372  case SSL3_ST_CR_CERT_B:
373 #ifndef OPENSSL_NO_TLSEXT
374  ret=ssl3_check_finished(s);
375  if (ret <= 0) goto end;
376  if (ret == 2)
377  {
378  s->hit = 1;
379  if (s->tlsext_ticket_expected)
380  s->state=SSL3_ST_CR_SESSION_TICKET_A;
381  else
382  s->state=SSL3_ST_CR_FINISHED_A;
383  s->init_num=0;
384  break;
385  }
386 #endif
387  /* Check if it is anon DH or PSK */
388  if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
389  !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
390  {
391  ret=ssl3_get_server_certificate(s);
392  if (ret <= 0) goto end;
393 #ifndef OPENSSL_NO_TLSEXT
394  if (s->tlsext_status_expected)
395  s->state=SSL3_ST_CR_CERT_STATUS_A;
396  else
397  s->state=SSL3_ST_CR_KEY_EXCH_A;
398  }
399  else
400  {
401  skip = 1;
402  s->state=SSL3_ST_CR_KEY_EXCH_A;
403  }
404 #else
405  }
406  else
407  skip=1;
408 
409  s->state=SSL3_ST_CR_KEY_EXCH_A;
410 #endif
411  s->init_num=0;
412  break;
413 
414  case SSL3_ST_CR_KEY_EXCH_A:
415  case SSL3_ST_CR_KEY_EXCH_B:
416  ret=ssl3_get_key_exchange(s);
417  if (ret <= 0) goto end;
418  s->state=SSL3_ST_CR_CERT_REQ_A;
419  s->init_num=0;
420 
421  /* at this point we check that we have the
422  * required stuff from the server */
423  if (!ssl3_check_cert_and_algorithm(s))
424  {
425  ret= -1;
426  goto end;
427  }
428  break;
429 
430  case SSL3_ST_CR_CERT_REQ_A:
431  case SSL3_ST_CR_CERT_REQ_B:
432  ret=ssl3_get_certificate_request(s);
433  if (ret <= 0) goto end;
434  s->state=SSL3_ST_CR_SRVR_DONE_A;
435  s->init_num=0;
436  break;
437 
438  case SSL3_ST_CR_SRVR_DONE_A:
439  case SSL3_ST_CR_SRVR_DONE_B:
440  ret=ssl3_get_server_done(s);
441  if (ret <= 0) goto end;
442  dtls1_stop_timer(s);
443  if (s->s3->tmp.cert_req)
444  s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;
445  else
446  s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;
447  s->init_num=0;
448 
449 #ifndef OPENSSL_NO_SCTP
450  if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
451  state == SSL_ST_RENEGOTIATE)
452  s->state=DTLS1_SCTP_ST_CR_READ_SOCK;
453  else
454 #endif
455  s->state=s->s3->tmp.next_state;
456  break;
457 
458  case SSL3_ST_CW_CERT_A:
459  case SSL3_ST_CW_CERT_B:
460  case SSL3_ST_CW_CERT_C:
461  case SSL3_ST_CW_CERT_D:
462  dtls1_start_timer(s);
463  ret=dtls1_send_client_certificate(s);
464  if (ret <= 0) goto end;
465  s->state=SSL3_ST_CW_KEY_EXCH_A;
466  s->init_num=0;
467  break;
468 
469  case SSL3_ST_CW_KEY_EXCH_A:
470  case SSL3_ST_CW_KEY_EXCH_B:
471  dtls1_start_timer(s);
472  ret=dtls1_send_client_key_exchange(s);
473  if (ret <= 0) goto end;
474 
475 #ifndef OPENSSL_NO_SCTP
476  /* Add new shared key for SCTP-Auth,
477  * will be ignored if no SCTP used.
478  */
479  snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
480  DTLS1_SCTP_AUTH_LABEL);
481 
482  SSL_export_keying_material(s, sctpauthkey,
483  sizeof(sctpauthkey), labelbuffer,
484  sizeof(labelbuffer), NULL, 0, 0);
485 
486  BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
487  sizeof(sctpauthkey), sctpauthkey);
488 #endif
489 
490  /* EAY EAY EAY need to check for DH fix cert
491  * sent back */
492  /* For TLS, cert_req is set to 2, so a cert chain
493  * of nothing is sent, but no verify packet is sent */
494  if (s->s3->tmp.cert_req == 1)
495  {
496  s->state=SSL3_ST_CW_CERT_VRFY_A;
497  }
498  else
499  {
500 #ifndef OPENSSL_NO_SCTP
501  if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
502  {
503  s->d1->next_state=SSL3_ST_CW_CHANGE_A;
504  s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
505  }
506  else
507 #endif
508  s->state=SSL3_ST_CW_CHANGE_A;
509  s->s3->change_cipher_spec=0;
510  }
511 
512  s->init_num=0;
513  break;
514 
515  case SSL3_ST_CW_CERT_VRFY_A:
516  case SSL3_ST_CW_CERT_VRFY_B:
517  dtls1_start_timer(s);
518  ret=dtls1_send_client_verify(s);
519  if (ret <= 0) goto end;
520 #ifndef OPENSSL_NO_SCTP
521  if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
522  {
523  s->d1->next_state=SSL3_ST_CW_CHANGE_A;
524  s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
525  }
526  else
527 #endif
528  s->state=SSL3_ST_CW_CHANGE_A;
529  s->init_num=0;
530  s->s3->change_cipher_spec=0;
531  break;
532 
533  case SSL3_ST_CW_CHANGE_A:
534  case SSL3_ST_CW_CHANGE_B:
535  if (!s->hit)
536  dtls1_start_timer(s);
537  ret=dtls1_send_change_cipher_spec(s,
538  SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
539  if (ret <= 0) goto end;
540 
541 #ifndef OPENSSL_NO_SCTP
542  /* Change to new shared key of SCTP-Auth,
543  * will be ignored if no SCTP used.
544  */
545  BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
546 #endif
547 
548  s->state=SSL3_ST_CW_FINISHED_A;
549  s->init_num=0;
550 
551  s->session->cipher=s->s3->tmp.new_cipher;
552 #ifdef OPENSSL_NO_COMP
553  s->session->compress_meth=0;
554 #else
555  if (s->s3->tmp.new_compression == NULL)
556  s->session->compress_meth=0;
557  else
558  s->session->compress_meth=
559  s->s3->tmp.new_compression->id;
560 #endif
561  if (!s->method->ssl3_enc->setup_key_block(s))
562  {
563  ret= -1;
564  goto end;
565  }
566 
567  if (!s->method->ssl3_enc->change_cipher_state(s,
568  SSL3_CHANGE_CIPHER_CLIENT_WRITE))
569  {
570  ret= -1;
571  goto end;
572  }
573 
574  dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
575  break;
576 
577  case SSL3_ST_CW_FINISHED_A:
578  case SSL3_ST_CW_FINISHED_B:
579  if (!s->hit)
580  dtls1_start_timer(s);
581  ret=dtls1_send_finished(s,
582  SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
583  s->method->ssl3_enc->client_finished_label,
584  s->method->ssl3_enc->client_finished_label_len);
585  if (ret <= 0) goto end;
586  s->state=SSL3_ST_CW_FLUSH;
587 
588  /* clear flags */
589  s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
590  if (s->hit)
591  {
592  s->s3->tmp.next_state=SSL_ST_OK;
593 #ifndef OPENSSL_NO_SCTP
594  if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
595  {
596  s->d1->next_state = s->s3->tmp.next_state;
597  s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
598  }
599 #endif
600  if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
601  {
602  s->state=SSL_ST_OK;
603 #ifndef OPENSSL_NO_SCTP
604  if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
605  {
606  s->d1->next_state = SSL_ST_OK;
607  s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
608  }
609 #endif
610  s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
611  s->s3->delay_buf_pop_ret=0;
612  }
613  }
614  else
615  {
616 #ifndef OPENSSL_NO_TLSEXT
617  /* Allow NewSessionTicket if ticket expected */
618  if (s->tlsext_ticket_expected)
619  s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
620  else
621 #endif
622 
623  s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
624  }
625  s->init_num=0;
626  break;
627 
628 #ifndef OPENSSL_NO_TLSEXT
629  case SSL3_ST_CR_SESSION_TICKET_A:
630  case SSL3_ST_CR_SESSION_TICKET_B:
631  ret=ssl3_get_new_session_ticket(s);
632  if (ret <= 0) goto end;
633  s->state=SSL3_ST_CR_FINISHED_A;
634  s->init_num=0;
635  break;
636 
637  case SSL3_ST_CR_CERT_STATUS_A:
638  case SSL3_ST_CR_CERT_STATUS_B:
639  ret=ssl3_get_cert_status(s);
640  if (ret <= 0) goto end;
641  s->state=SSL3_ST_CR_KEY_EXCH_A;
642  s->init_num=0;
643  break;
644 #endif
645 
646  case SSL3_ST_CR_FINISHED_A:
647  case SSL3_ST_CR_FINISHED_B:
648  s->d1->change_cipher_spec_ok = 1;
649  ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
650  SSL3_ST_CR_FINISHED_B);
651  if (ret <= 0) goto end;
652  dtls1_stop_timer(s);
653 
654  if (s->hit)
655  s->state=SSL3_ST_CW_CHANGE_A;
656  else
657  s->state=SSL_ST_OK;
658 
659 #ifndef OPENSSL_NO_SCTP
660  if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
661  state == SSL_ST_RENEGOTIATE)
662  {
663  s->d1->next_state=s->state;
664  s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
665  }
666 #endif
667 
668  s->init_num=0;
669  break;
670 
671  case SSL3_ST_CW_FLUSH:
672  s->rwstate=SSL_WRITING;
673  if (BIO_flush(s->wbio) <= 0)
674  {
675  /* If the write error was fatal, stop trying */
676  if (!BIO_should_retry(s->wbio))
677  {
678  s->rwstate=SSL_NOTHING;
679  s->state=s->s3->tmp.next_state;
680  }
681 
682  ret= -1;
683  goto end;
684  }
685  s->rwstate=SSL_NOTHING;
686  s->state=s->s3->tmp.next_state;
687  break;
688 
689  case SSL_ST_OK:
690  /* clean a few things up */
691  ssl3_cleanup_key_block(s);
692 
693 #if 0
694  if (s->init_buf != NULL)
695  {
696  BUF_MEM_free(s->init_buf);
697  s->init_buf=NULL;
698  }
699 #endif
700 
701  /* If we are not 'joining' the last two packets,
702  * remove the buffering now */
703  if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
704  ssl_free_wbio_buffer(s);
705  /* else do it later in ssl3_write */
706 
707  s->init_num=0;
708  s->renegotiate=0;
709  s->new_session=0;
710 
711  ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
712  if (s->hit) s->ctx->stats.sess_hit++;
713 
714  ret=1;
715  /* s->server=0; */
716  s->handshake_func=dtls1_connect;
717  s->ctx->stats.sess_connect_good++;
718 
719  if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
720 
721  /* done with handshaking */
722  s->d1->handshake_read_seq = 0;
723  s->d1->next_handshake_write_seq = 0;
724  goto end;
725  /* break; */
726 
727  default:
728  SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
729  ret= -1;
730  goto end;
731  /* break; */
732  }
733 
734  /* did we do anything */
735  if (!s->s3->tmp.reuse_message && !skip)
736  {
737  if (s->debug)
738  {
739  if ((ret=BIO_flush(s->wbio)) <= 0)
740  goto end;
741  }
742 
743  if ((cb != NULL) && (s->state != state))
744  {
745  new_state=s->state;
746  s->state=state;
747  cb(s,SSL_CB_CONNECT_LOOP,1);
748  s->state=new_state;
749  }
750  }
751  skip=0;
752  }
753 end:
754  s->in_handshake--;
755 
756 #ifndef OPENSSL_NO_SCTP
757  /* Notify SCTP BIO socket to leave handshake
758  * mode and allow stream identifier other
759  * than 0. Will be ignored if no SCTP is used.
760  */
761  BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
762 #endif
763 
764  if (buf != NULL)
765  BUF_MEM_free(buf);
766  if (cb != NULL)
767  cb(s,SSL_CB_CONNECT_EXIT,ret);
768  return(ret);
769  }
770 
771 int dtls1_client_hello(SSL *s)
772  {
773  unsigned char *buf;
774  unsigned char *p,*d;
775  unsigned int i,j;
776  unsigned long Time,l;
777  SSL_COMP *comp;
778 
779  buf=(unsigned char *)s->init_buf->data;
780  if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
781  {
782  SSL_SESSION *sess = s->session;
783  if ((s->session == NULL) ||
784  (s->session->ssl_version != s->version) ||
785 #ifdef OPENSSL_NO_TLSEXT
786  !sess->session_id_length ||
787 #else
788  (!sess->session_id_length && !sess->tlsext_tick) ||
789 #endif
790  (s->session->not_resumable))
791  {
792  if (!ssl_get_new_session(s,0))
793  goto err;
794  }
795  /* else use the pre-loaded session */
796 
797  p=s->s3->client_random;
798 
799  /* if client_random is initialized, reuse it, we are
800  * required to use same upon reply to HelloVerify */
801  for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
802  if (i==sizeof(s->s3->client_random))
803  {
804  Time=(unsigned long)time(NULL); /* Time */
805  l2n(Time,p);
806  RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
807  }
808 
809  /* Do the message type and length last */
810  d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
811 
812  *(p++)=s->version>>8;
813  *(p++)=s->version&0xff;
814  s->client_version=s->version;
815 
816  /* Random stuff */
817  memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
818  p+=SSL3_RANDOM_SIZE;
819 
820  /* Session ID */
821  if (s->new_session)
822  i=0;
823  else
824  i=s->session->session_id_length;
825  *(p++)=i;
826  if (i != 0)
827  {
828  if (i > sizeof s->session->session_id)
829  {
830  SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
831  goto err;
832  }
833  memcpy(p,s->session->session_id,i);
834  p+=i;
835  }
836 
837  /* cookie stuff */
838  if ( s->d1->cookie_len > sizeof(s->d1->cookie))
839  {
840  SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
841  goto err;
842  }
843  *(p++) = s->d1->cookie_len;
844  memcpy(p, s->d1->cookie, s->d1->cookie_len);
845  p += s->d1->cookie_len;
846 
847  /* Ciphers supported */
848  i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
849  if (i == 0)
850  {
851  SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
852  goto err;
853  }
854  s2n(i,p);
855  p+=i;
856 
857  /* COMPRESSION */
858  if (s->ctx->comp_methods == NULL)
859  j=0;
860  else
861  j=sk_SSL_COMP_num(s->ctx->comp_methods);
862  *(p++)=1+j;
863  for (i=0; i<j; i++)
864  {
865  comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
866  *(p++)=comp->id;
867  }
868  *(p++)=0; /* Add the NULL method */
869 
870 #ifndef OPENSSL_NO_TLSEXT
871  if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
872  {
873  SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
874  goto err;
875  }
876 #endif
877 
878  l=(p-d);
879  d=buf;
880 
881  d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
882 
883  s->state=SSL3_ST_CW_CLNT_HELLO_B;
884  /* number of bytes to write */
885  s->init_num=p-buf;
886  s->init_off=0;
887 
888  /* buffer the message to handle re-xmits */
889  dtls1_buffer_message(s, 0);
890  }
891 
892  /* SSL3_ST_CW_CLNT_HELLO_B */
893  return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
894 err:
895  return(-1);
896  }
897 
898 static int dtls1_get_hello_verify(SSL *s)
899  {
900  int n, al, ok = 0;
901  unsigned char *data;
902  unsigned int cookie_len;
903 
904  n=s->method->ssl_get_message(s,
905  DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
906  DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
907  -1,
908  s->max_cert_list,
909  &ok);
910 
911  if (!ok) return((int)n);
912 
913  if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
914  {
915  s->d1->send_cookie = 0;
916  s->s3->tmp.reuse_message=1;
917  return(1);
918  }
919 
920  data = (unsigned char *)s->init_msg;
921 
922  if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
923  {
924  SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
925  s->version=(s->version&0xff00)|data[1];
926  al = SSL_AD_PROTOCOL_VERSION;
927  goto f_err;
928  }
929  data+=2;
930 
931  cookie_len = *(data++);
932  if ( cookie_len > sizeof(s->d1->cookie))
933  {
934  al=SSL_AD_ILLEGAL_PARAMETER;
935  goto f_err;
936  }
937 
938  memcpy(s->d1->cookie, data, cookie_len);
939  s->d1->cookie_len = cookie_len;
940 
941  s->d1->send_cookie = 1;
942  return 1;
943 
944 f_err:
945  ssl3_send_alert(s, SSL3_AL_FATAL, al);
946  return -1;
947  }
948 
949 int dtls1_send_client_key_exchange(SSL *s)
950  {
951  unsigned char *p,*d;
952  int n;
953  unsigned long alg_k;
954 #ifndef OPENSSL_NO_RSA
955  unsigned char *q;
956  EVP_PKEY *pkey=NULL;
957 #endif
958 #ifndef OPENSSL_NO_KRB5
959  KSSL_ERR kssl_err;
960 #endif /* OPENSSL_NO_KRB5 */
961 #ifndef OPENSSL_NO_ECDH
962  EC_KEY *clnt_ecdh = NULL;
963  const EC_POINT *srvr_ecpoint = NULL;
964  EVP_PKEY *srvr_pub_pkey = NULL;
965  unsigned char *encodedPoint = NULL;
966  int encoded_pt_len = 0;
967  BN_CTX * bn_ctx = NULL;
968 #endif
969 
970  if (s->state == SSL3_ST_CW_KEY_EXCH_A)
971  {
972  d=(unsigned char *)s->init_buf->data;
973  p= &(d[DTLS1_HM_HEADER_LENGTH]);
974 
975  alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
976 
977  /* Fool emacs indentation */
978  if (0) {}
979 #ifndef OPENSSL_NO_RSA
980  else if (alg_k & SSL_kRSA)
981  {
982  RSA *rsa;
983  unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
984 
985  if (s->session->sess_cert->peer_rsa_tmp != NULL)
986  rsa=s->session->sess_cert->peer_rsa_tmp;
987  else
988  {
989  pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
990  if ((pkey == NULL) ||
991  (pkey->type != EVP_PKEY_RSA) ||
992  (pkey->pkey.rsa == NULL))
993  {
994  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
995  goto err;
996  }
997  rsa=pkey->pkey.rsa;
998  EVP_PKEY_free(pkey);
999  }
1000 
1001  tmp_buf[0]=s->client_version>>8;
1002  tmp_buf[1]=s->client_version&0xff;
1003  if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1004  goto err;
1005 
1006  s->session->master_key_length=sizeof tmp_buf;
1007 
1008  q=p;
1009  /* Fix buf for TLS and [incidentally] DTLS */
1010  if (s->version > SSL3_VERSION)
1011  p+=2;
1012  n=RSA_public_encrypt(sizeof tmp_buf,
1013  tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1014 #ifdef PKCS1_CHECK
1015  if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1016  if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1017 #endif
1018  if (n <= 0)
1019  {
1020  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1021  goto err;
1022  }
1023 
1024  /* Fix buf for TLS and [incidentally] DTLS */
1025  if (s->version > SSL3_VERSION)
1026  {
1027  s2n(n,q);
1028  n+=2;
1029  }
1030 
1031  s->session->master_key_length=
1032  s->method->ssl3_enc->generate_master_secret(s,
1033  s->session->master_key,
1034  tmp_buf,sizeof tmp_buf);
1035  OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1036  }
1037 #endif
1038 #ifndef OPENSSL_NO_KRB5
1039  else if (alg_k & SSL_kKRB5)
1040  {
1041  krb5_error_code krb5rc;
1042  KSSL_CTX *kssl_ctx = s->kssl_ctx;
1043  /* krb5_data krb5_ap_req; */
1044  krb5_data *enc_ticket;
1045  krb5_data authenticator, *authp = NULL;
1046  EVP_CIPHER_CTX ciph_ctx;
1047  const EVP_CIPHER *enc = NULL;
1048  unsigned char iv[EVP_MAX_IV_LENGTH];
1049  unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1050  unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
1051  + EVP_MAX_IV_LENGTH];
1052  int padl, outl = sizeof(epms);
1053 
1054  EVP_CIPHER_CTX_init(&ciph_ctx);
1055 
1056 #ifdef KSSL_DEBUG
1057  printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1058  alg_k, SSL_kKRB5);
1059 #endif /* KSSL_DEBUG */
1060 
1061  authp = NULL;
1062 #ifdef KRB5SENDAUTH
1063  if (KRB5SENDAUTH) authp = &authenticator;
1064 #endif /* KRB5SENDAUTH */
1065 
1066  krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1067  &kssl_err);
1068  enc = kssl_map_enc(kssl_ctx->enctype);
1069  if (enc == NULL)
1070  goto err;
1071 #ifdef KSSL_DEBUG
1072  {
1073  printf("kssl_cget_tkt rtn %d\n", krb5rc);
1074  if (krb5rc && kssl_err.text)
1075  printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1076  }
1077 #endif /* KSSL_DEBUG */
1078 
1079  if (krb5rc)
1080  {
1081  ssl3_send_alert(s,SSL3_AL_FATAL,
1082  SSL_AD_HANDSHAKE_FAILURE);
1083  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1084  kssl_err.reason);
1085  goto err;
1086  }
1087 
1088  /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
1089  ** in place of RFC 2712 KerberosWrapper, as in:
1090  **
1091  ** Send ticket (copy to *p, set n = length)
1092  ** n = krb5_ap_req.length;
1093  ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1094  ** if (krb5_ap_req.data)
1095  ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1096  **
1097  ** Now using real RFC 2712 KerberosWrapper
1098  ** (Thanks to Simon Wilkinson <[email protected]>)
1099  ** Note: 2712 "opaque" types are here replaced
1100  ** with a 2-byte length followed by the value.
1101  ** Example:
1102  ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1103  ** Where "xx xx" = length bytes. Shown here with
1104  ** optional authenticator omitted.
1105  */
1106 
1107  /* KerberosWrapper.Ticket */
1108  s2n(enc_ticket->length,p);
1109  memcpy(p, enc_ticket->data, enc_ticket->length);
1110  p+= enc_ticket->length;
1111  n = enc_ticket->length + 2;
1112 
1113  /* KerberosWrapper.Authenticator */
1114  if (authp && authp->length)
1115  {
1116  s2n(authp->length,p);
1117  memcpy(p, authp->data, authp->length);
1118  p+= authp->length;
1119  n+= authp->length + 2;
1120 
1121  free(authp->data);
1122  authp->data = NULL;
1123  authp->length = 0;
1124  }
1125  else
1126  {
1127  s2n(0,p);/* null authenticator length */
1128  n+=2;
1129  }
1130 
1131  if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1132  goto err;
1133 
1134  /* 20010420 VRS. Tried it this way; failed.
1135  ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1136  ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1137  ** kssl_ctx->length);
1138  ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1139  */
1140 
1141  memset(iv, 0, sizeof iv); /* per RFC 1510 */
1142  EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1143  kssl_ctx->key,iv);
1144  EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1145  sizeof tmp_buf);
1146  EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1147  outl += padl;
1148  if (outl > (int)sizeof epms)
1149  {
1150  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1151  goto err;
1152  }
1153  EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1154 
1155  /* KerberosWrapper.EncryptedPreMasterSecret */
1156  s2n(outl,p);
1157  memcpy(p, epms, outl);
1158  p+=outl;
1159  n+=outl + 2;
1160 
1161  s->session->master_key_length=
1162  s->method->ssl3_enc->generate_master_secret(s,
1163  s->session->master_key,
1164  tmp_buf, sizeof tmp_buf);
1165 
1166  OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1167  OPENSSL_cleanse(epms, outl);
1168  }
1169 #endif
1170 #ifndef OPENSSL_NO_DH
1171  else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1172  {
1173  DH *dh_srvr,*dh_clnt;
1174 
1175  if (s->session->sess_cert->peer_dh_tmp != NULL)
1176  dh_srvr=s->session->sess_cert->peer_dh_tmp;
1177  else
1178  {
1179  /* we get them from the cert */
1180  ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1181  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1182  goto err;
1183  }
1184 
1185  /* generate a new random key */
1186  if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1187  {
1188  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1189  goto err;
1190  }
1191  if (!DH_generate_key(dh_clnt))
1192  {
1193  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1194  goto err;
1195  }
1196 
1197  /* use the 'p' output buffer for the DH key, but
1198  * make sure to clear it out afterwards */
1199 
1200  n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1201 
1202  if (n <= 0)
1203  {
1204  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1205  goto err;
1206  }
1207 
1208  /* generate master key from the result */
1209  s->session->master_key_length=
1210  s->method->ssl3_enc->generate_master_secret(s,
1211  s->session->master_key,p,n);
1212  /* clean up */
1213  memset(p,0,n);
1214 
1215  /* send off the data */
1216  n=BN_num_bytes(dh_clnt->pub_key);
1217  s2n(n,p);
1218  BN_bn2bin(dh_clnt->pub_key,p);
1219  n+=2;
1220 
1221  DH_free(dh_clnt);
1222 
1223  /* perhaps clean things up a bit EAY EAY EAY EAY*/
1224  }
1225 #endif
1226 #ifndef OPENSSL_NO_ECDH
1227  else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
1228  {
1229  const EC_GROUP *srvr_group = NULL;
1230  EC_KEY *tkey;
1231  int ecdh_clnt_cert = 0;
1232  int field_size = 0;
1233 
1234  /* Did we send out the client's
1235  * ECDH share for use in premaster
1236  * computation as part of client certificate?
1237  * If so, set ecdh_clnt_cert to 1.
1238  */
1239  if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
1240  {
1241  /* XXX: For now, we do not support client
1242  * authentication using ECDH certificates.
1243  * To add such support, one needs to add
1244  * code that checks for appropriate
1245  * conditions and sets ecdh_clnt_cert to 1.
1246  * For example, the cert have an ECC
1247  * key on the same curve as the server's
1248  * and the key should be authorized for
1249  * key agreement.
1250  *
1251  * One also needs to add code in ssl3_connect
1252  * to skip sending the certificate verify
1253  * message.
1254  *
1255  * if ((s->cert->key->privatekey != NULL) &&
1256  * (s->cert->key->privatekey->type ==
1257  * EVP_PKEY_EC) && ...)
1258  * ecdh_clnt_cert = 1;
1259  */
1260  }
1261 
1262  if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1263  {
1264  tkey = s->session->sess_cert->peer_ecdh_tmp;
1265  }
1266  else
1267  {
1268  /* Get the Server Public Key from Cert */
1269  srvr_pub_pkey = X509_get_pubkey(s->session-> \
1270  sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1271  if ((srvr_pub_pkey == NULL) ||
1272  (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1273  (srvr_pub_pkey->pkey.ec == NULL))
1274  {
1275  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1276  ERR_R_INTERNAL_ERROR);
1277  goto err;
1278  }
1279 
1280  tkey = srvr_pub_pkey->pkey.ec;
1281  }
1282 
1283  srvr_group = EC_KEY_get0_group(tkey);
1284  srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1285 
1286  if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1287  {
1288  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1289  ERR_R_INTERNAL_ERROR);
1290  goto err;
1291  }
1292 
1293  if ((clnt_ecdh=EC_KEY_new()) == NULL)
1294  {
1295  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1296  goto err;
1297  }
1298 
1299  if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1300  {
1301  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1302  goto err;
1303  }
1304  if (ecdh_clnt_cert)
1305  {
1306  /* Reuse key info from our certificate
1307  * We only need our private key to perform
1308  * the ECDH computation.
1309  */
1310  const BIGNUM *priv_key;
1311  tkey = s->cert->key->privatekey->pkey.ec;
1312  priv_key = EC_KEY_get0_private_key(tkey);
1313  if (priv_key == NULL)
1314  {
1315  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1316  goto err;
1317  }
1318  if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1319  {
1320  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1321  goto err;
1322  }
1323  }
1324  else
1325  {
1326  /* Generate a new ECDH key pair */
1327  if (!(EC_KEY_generate_key(clnt_ecdh)))
1328  {
1329  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1330  goto err;
1331  }
1332  }
1333 
1334  /* use the 'p' output buffer for the ECDH key, but
1335  * make sure to clear it out afterwards
1336  */
1337 
1338  field_size = EC_GROUP_get_degree(srvr_group);
1339  if (field_size <= 0)
1340  {
1341  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1342  ERR_R_ECDH_LIB);
1343  goto err;
1344  }
1345  n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1346  if (n <= 0)
1347  {
1348  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1349  ERR_R_ECDH_LIB);
1350  goto err;
1351  }
1352 
1353  /* generate master key from the result */
1354  s->session->master_key_length = s->method->ssl3_enc \
1355  -> generate_master_secret(s,
1356  s->session->master_key,
1357  p, n);
1358 
1359  memset(p, 0, n); /* clean up */
1360 
1361  if (ecdh_clnt_cert)
1362  {
1363  /* Send empty client key exch message */
1364  n = 0;
1365  }
1366  else
1367  {
1368  /* First check the size of encoding and
1369  * allocate memory accordingly.
1370  */
1371  encoded_pt_len =
1372  EC_POINT_point2oct(srvr_group,
1373  EC_KEY_get0_public_key(clnt_ecdh),
1374  POINT_CONVERSION_UNCOMPRESSED,
1375  NULL, 0, NULL);
1376 
1377  encodedPoint = (unsigned char *)
1378  OPENSSL_malloc(encoded_pt_len *
1379  sizeof(unsigned char));
1380  bn_ctx = BN_CTX_new();
1381  if ((encodedPoint == NULL) ||
1382  (bn_ctx == NULL))
1383  {
1384  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1385  goto err;
1386  }
1387 
1388  /* Encode the public key */
1389  n = EC_POINT_point2oct(srvr_group,
1390  EC_KEY_get0_public_key(clnt_ecdh),
1391  POINT_CONVERSION_UNCOMPRESSED,
1392  encodedPoint, encoded_pt_len, bn_ctx);
1393 
1394  *p = n; /* length of encoded point */
1395  /* Encoded point will be copied here */
1396  p += 1;
1397  /* copy the point */
1398  memcpy((unsigned char *)p, encodedPoint, n);
1399  /* increment n to account for length field */
1400  n += 1;
1401  }
1402 
1403  /* Free allocated memory */
1404  BN_CTX_free(bn_ctx);
1405  if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1406  if (clnt_ecdh != NULL)
1407  EC_KEY_free(clnt_ecdh);
1408  EVP_PKEY_free(srvr_pub_pkey);
1409  }
1410 #endif /* !OPENSSL_NO_ECDH */
1411 
1412 #ifndef OPENSSL_NO_PSK
1413  else if (alg_k & SSL_kPSK)
1414  {
1415  char identity[PSK_MAX_IDENTITY_LEN];
1416  unsigned char *t = NULL;
1417  unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1418  unsigned int pre_ms_len = 0, psk_len = 0;
1419  int psk_err = 1;
1420 
1421  n = 0;
1422  if (s->psk_client_callback == NULL)
1423  {
1424  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1425  SSL_R_PSK_NO_CLIENT_CB);
1426  goto err;
1427  }
1428 
1429  psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1430  identity, PSK_MAX_IDENTITY_LEN,
1431  psk_or_pre_ms, sizeof(psk_or_pre_ms));
1432  if (psk_len > PSK_MAX_PSK_LEN)
1433  {
1434  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1435  ERR_R_INTERNAL_ERROR);
1436  goto psk_err;
1437  }
1438  else if (psk_len == 0)
1439  {
1440  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1441  SSL_R_PSK_IDENTITY_NOT_FOUND);
1442  goto psk_err;
1443  }
1444 
1445  /* create PSK pre_master_secret */
1446  pre_ms_len = 2+psk_len+2+psk_len;
1447  t = psk_or_pre_ms;
1448  memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1449  s2n(psk_len, t);
1450  memset(t, 0, psk_len);
1451  t+=psk_len;
1452  s2n(psk_len, t);
1453 
1454  if (s->session->psk_identity_hint != NULL)
1455  OPENSSL_free(s->session->psk_identity_hint);
1456  s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1457  if (s->ctx->psk_identity_hint != NULL &&
1458  s->session->psk_identity_hint == NULL)
1459  {
1460  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1461  ERR_R_MALLOC_FAILURE);
1462  goto psk_err;
1463  }
1464 
1465  if (s->session->psk_identity != NULL)
1466  OPENSSL_free(s->session->psk_identity);
1467  s->session->psk_identity = BUF_strdup(identity);
1468  if (s->session->psk_identity == NULL)
1469  {
1470  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1471  ERR_R_MALLOC_FAILURE);
1472  goto psk_err;
1473  }
1474 
1475  s->session->master_key_length =
1476  s->method->ssl3_enc->generate_master_secret(s,
1477  s->session->master_key,
1478  psk_or_pre_ms, pre_ms_len);
1479  n = strlen(identity);
1480  s2n(n, p);
1481  memcpy(p, identity, n);
1482  n+=2;
1483  psk_err = 0;
1484  psk_err:
1485  OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1486  OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1487  if (psk_err != 0)
1488  {
1489  ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1490  goto err;
1491  }
1492  }
1493 #endif
1494  else
1495  {
1496  ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1497  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1498  goto err;
1499  }
1500 
1501  d = dtls1_set_message_header(s, d,
1502  SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1503  /*
1504  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1505  l2n3(n,d);
1506  l2n(s->d1->handshake_write_seq,d);
1507  s->d1->handshake_write_seq++;
1508  */
1509 
1510  s->state=SSL3_ST_CW_KEY_EXCH_B;
1511  /* number of bytes to write */
1512  s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1513  s->init_off=0;
1514 
1515  /* buffer the message to handle re-xmits */
1516  dtls1_buffer_message(s, 0);
1517  }
1518 
1519  /* SSL3_ST_CW_KEY_EXCH_B */
1520  return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1521 err:
1522 #ifndef OPENSSL_NO_ECDH
1523  BN_CTX_free(bn_ctx);
1524  if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1525  if (clnt_ecdh != NULL)
1526  EC_KEY_free(clnt_ecdh);
1527  EVP_PKEY_free(srvr_pub_pkey);
1528 #endif
1529  return(-1);
1530  }
1531 
1532 int dtls1_send_client_verify(SSL *s)
1533  {
1534  unsigned char *p,*d;
1535  unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1536  EVP_PKEY *pkey;
1537 #ifndef OPENSSL_NO_RSA
1538  unsigned u=0;
1539 #endif
1540  unsigned long n;
1541 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1542  int j;
1543 #endif
1544 
1545  if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1546  {
1547  d=(unsigned char *)s->init_buf->data;
1548  p= &(d[DTLS1_HM_HEADER_LENGTH]);
1549  pkey=s->cert->key->privatekey;
1550 
1551  s->method->ssl3_enc->cert_verify_mac(s,
1552  NID_sha1,
1553  &(data[MD5_DIGEST_LENGTH]));
1554 
1555 #ifndef OPENSSL_NO_RSA
1556  if (pkey->type == EVP_PKEY_RSA)
1557  {
1558  s->method->ssl3_enc->cert_verify_mac(s,
1559  NID_md5,
1560  &(data[0]));
1561  if (RSA_sign(NID_md5_sha1, data,
1562  MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1563  &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1564  {
1565  SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1566  goto err;
1567  }
1568  s2n(u,p);
1569  n=u+2;
1570  }
1571  else
1572 #endif
1573 #ifndef OPENSSL_NO_DSA
1574  if (pkey->type == EVP_PKEY_DSA)
1575  {
1576  if (!DSA_sign(pkey->save_type,
1577  &(data[MD5_DIGEST_LENGTH]),
1578  SHA_DIGEST_LENGTH,&(p[2]),
1579  (unsigned int *)&j,pkey->pkey.dsa))
1580  {
1581  SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1582  goto err;
1583  }
1584  s2n(j,p);
1585  n=j+2;
1586  }
1587  else
1588 #endif
1589 #ifndef OPENSSL_NO_ECDSA
1590  if (pkey->type == EVP_PKEY_EC)
1591  {
1592  if (!ECDSA_sign(pkey->save_type,
1593  &(data[MD5_DIGEST_LENGTH]),
1594  SHA_DIGEST_LENGTH,&(p[2]),
1595  (unsigned int *)&j,pkey->pkey.ec))
1596  {
1597  SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1598  ERR_R_ECDSA_LIB);
1599  goto err;
1600  }
1601  s2n(j,p);
1602  n=j+2;
1603  }
1604  else
1605 #endif
1606  {
1607  SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1608  goto err;
1609  }
1610 
1611  d = dtls1_set_message_header(s, d,
1612  SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1613 
1614  s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1615  s->init_off=0;
1616 
1617  /* buffer the message to handle re-xmits */
1618  dtls1_buffer_message(s, 0);
1619 
1620  s->state = SSL3_ST_CW_CERT_VRFY_B;
1621  }
1622 
1623  /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1624  return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1625 err:
1626  return(-1);
1627  }
1628 
1629 int dtls1_send_client_certificate(SSL *s)
1630  {
1631  X509 *x509=NULL;
1632  EVP_PKEY *pkey=NULL;
1633  int i;
1634  unsigned long l;
1635 
1636  if (s->state == SSL3_ST_CW_CERT_A)
1637  {
1638  if ((s->cert == NULL) ||
1639  (s->cert->key->x509 == NULL) ||
1640  (s->cert->key->privatekey == NULL))
1641  s->state=SSL3_ST_CW_CERT_B;
1642  else
1643  s->state=SSL3_ST_CW_CERT_C;
1644  }
1645 
1646  /* We need to get a client cert */
1647  if (s->state == SSL3_ST_CW_CERT_B)
1648  {
1649  /* If we get an error, we need to
1650  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1651  * We then get retied later */
1652  i=0;
1653  i = ssl_do_client_cert_cb(s, &x509, &pkey);
1654  if (i < 0)
1655  {
1656  s->rwstate=SSL_X509_LOOKUP;
1657  return(-1);
1658  }
1659  s->rwstate=SSL_NOTHING;
1660  if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1661  {
1662  s->state=SSL3_ST_CW_CERT_B;
1663  if ( !SSL_use_certificate(s,x509) ||
1664  !SSL_use_PrivateKey(s,pkey))
1665  i=0;
1666  }
1667  else if (i == 1)
1668  {
1669  i=0;
1670  SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1671  }
1672 
1673  if (x509 != NULL) X509_free(x509);
1674  if (pkey != NULL) EVP_PKEY_free(pkey);
1675  if (i == 0)
1676  {
1677  if (s->version == SSL3_VERSION)
1678  {
1679  s->s3->tmp.cert_req=0;
1680  ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1681  return(1);
1682  }
1683  else
1684  {
1685  s->s3->tmp.cert_req=2;
1686  }
1687  }
1688 
1689  /* Ok, we have a cert */
1690  s->state=SSL3_ST_CW_CERT_C;
1691  }
1692 
1693  if (s->state == SSL3_ST_CW_CERT_C)
1694  {
1695  s->state=SSL3_ST_CW_CERT_D;
1696  l=dtls1_output_cert_chain(s,
1697  (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1698  s->init_num=(int)l;
1699  s->init_off=0;
1700 
1701  /* set header called by dtls1_output_cert_chain() */
1702 
1703  /* buffer the message to handle re-xmits */
1704  dtls1_buffer_message(s, 0);
1705  }
1706  /* SSL3_ST_CW_CERT_D */
1707  return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1708  }
1709 
1710 
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