2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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
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.]
59 #define REUSE_CIPHER_BUG
60 #define NETSCAPE_HANG_BUG
64 #include <openssl/buffer.h>
65 #include <openssl/rand.h>
66 #include <openssl/objects.h>
67 #include <openssl/md5.h>
68 #include <openssl/sha.h>
69 #include <openssl/evp.h>
70 #include <openssl/x509.h>
73 static SSL_METHOD *ssl3_get_server_method(int ver);
74 static int ssl3_get_client_hello(SSL *s);
75 static int ssl3_check_client_hello(SSL *s);
76 static int ssl3_send_server_hello(SSL *s);
77 static int ssl3_send_server_key_exchange(SSL *s);
78 static int ssl3_send_certificate_request(SSL *s);
79 static int ssl3_send_server_done(SSL *s);
80 static int ssl3_get_client_key_exchange(SSL *s);
81 static int ssl3_get_client_certificate(SSL *s);
82 static int ssl3_get_cert_verify(SSL *s);
83 static int ssl3_send_hello_request(SSL *s);
85 static SSL_METHOD *ssl3_get_server_method(int ver)
87 if (ver == SSL3_VERSION)
88 return(SSLv3_server_method());
93 SSL_METHOD *SSLv3_server_method(void)
96 static SSL_METHOD SSLv3_server_data;
100 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
102 SSLv3_server_data.ssl_accept=ssl3_accept;
103 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
106 return(&SSLv3_server_data);
109 int ssl3_accept(SSL *s)
112 unsigned long l,Time=time(NULL);
116 int new_state,state,skip=0;
118 RAND_add(&Time,sizeof(Time),0);
122 if (s->info_callback != NULL)
124 else if (s->ctx->info_callback != NULL)
125 cb=s->ctx->info_callback;
127 /* init things to blank */
128 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
133 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
143 case SSL_ST_RENEGOTIATE:
145 /* s->state=SSL_ST_ACCEPT; */
149 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
150 case SSL_ST_OK|SSL_ST_ACCEPT:
153 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
155 if ((s->version>>8) != 3)
157 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_INTERNAL_ERROR);
160 s->type=SSL_ST_ACCEPT;
162 if (s->init_buf == NULL)
164 if ((buf=BUF_MEM_new()) == NULL)
169 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
177 if (!ssl3_setup_buffers(s))
183 /* Ok, we now need to push on a buffering BIO so that
184 * the output is sent in a way that TCP likes :-)
186 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
190 if (s->state != SSL_ST_RENEGOTIATE)
192 ssl3_init_finished_mac(s);
193 s->state=SSL3_ST_SR_CLNT_HELLO_A;
194 s->ctx->stats.sess_accept++;
198 s->ctx->stats.sess_accept_renegotiate++;
199 s->state=SSL3_ST_SW_HELLO_REQ_A;
203 case SSL3_ST_SW_HELLO_REQ_A:
204 case SSL3_ST_SW_HELLO_REQ_B:
207 ret=ssl3_send_hello_request(s);
208 if (ret <= 0) goto end;
209 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
210 s->state=SSL3_ST_SW_FLUSH;
213 ssl3_init_finished_mac(s);
216 case SSL3_ST_SW_HELLO_REQ_C:
222 case SSL3_ST_SR_CLNT_HELLO_A:
223 case SSL3_ST_SR_CLNT_HELLO_B:
224 case SSL3_ST_SR_CLNT_HELLO_C:
227 ret=ssl3_get_client_hello(s);
228 if (ret <= 0) goto end;
229 s->state=SSL3_ST_SW_SRVR_HELLO_A;
233 case SSL3_ST_SW_SRVR_HELLO_A:
234 case SSL3_ST_SW_SRVR_HELLO_B:
235 ret=ssl3_send_server_hello(s);
236 if (ret <= 0) goto end;
239 s->state=SSL3_ST_SW_CHANGE_A;
241 s->state=SSL3_ST_SW_CERT_A;
245 case SSL3_ST_SW_CERT_A:
246 case SSL3_ST_SW_CERT_B:
247 /* Check if it is anon DH */
248 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
250 ret=ssl3_send_server_certificate(s);
251 if (ret <= 0) goto end;
255 s->state=SSL3_ST_SW_KEY_EXCH_A;
259 case SSL3_ST_SW_KEY_EXCH_A:
260 case SSL3_ST_SW_KEY_EXCH_B:
261 l=s->s3->tmp.new_cipher->algorithms;
263 /* clear this, it may get reset by
264 * send_server_key_exchange */
265 if (s->options & SSL_OP_EPHEMERAL_RSA)
266 s->s3->tmp.use_rsa_tmp=1;
268 s->s3->tmp.use_rsa_tmp=0;
270 /* only send if a DH key exchange, fortezza or
271 * RSA but we have a sign only certificate */
272 if (s->s3->tmp.use_rsa_tmp
273 || (l & (SSL_DH|SSL_kFZA))
275 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
276 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
277 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
283 ret=ssl3_send_server_key_exchange(s);
284 if (ret <= 0) goto end;
289 s->state=SSL3_ST_SW_CERT_REQ_A;
293 case SSL3_ST_SW_CERT_REQ_A:
294 case SSL3_ST_SW_CERT_REQ_B:
295 if (/* don't request cert unless asked for it: */
296 !(s->verify_mode & SSL_VERIFY_PEER) ||
297 /* if SSL_VERIFY_CLIENT_ONCE is set,
298 * don't request cert during re-negotiation: */
299 ((s->session->peer != NULL) &&
300 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
301 /* never request cert in anonymous ciphersuites
302 * (see section "Certificate request" in SSL 3 drafts
303 * and in RFC 2246): */
304 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
305 /* ... except when the application insists on verification
306 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
307 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)))
309 /* no cert request */
311 s->s3->tmp.cert_request=0;
312 s->state=SSL3_ST_SW_SRVR_DONE_A;
316 s->s3->tmp.cert_request=1;
317 ret=ssl3_send_certificate_request(s);
318 if (ret <= 0) goto end;
319 #ifndef NETSCAPE_HANG_BUG
320 s->state=SSL3_ST_SW_SRVR_DONE_A;
322 s->state=SSL3_ST_SW_FLUSH;
323 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
329 case SSL3_ST_SW_SRVR_DONE_A:
330 case SSL3_ST_SW_SRVR_DONE_B:
331 ret=ssl3_send_server_done(s);
332 if (ret <= 0) goto end;
333 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
334 s->state=SSL3_ST_SW_FLUSH;
338 case SSL3_ST_SW_FLUSH:
339 /* number of bytes to be flushed */
340 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
343 s->rwstate=SSL_WRITING;
344 num1=BIO_flush(s->wbio);
345 if (num1 <= 0) { ret= -1; goto end; }
346 s->rwstate=SSL_NOTHING;
349 s->state=s->s3->tmp.next_state;
352 case SSL3_ST_SR_CERT_A:
353 case SSL3_ST_SR_CERT_B:
354 /* Check for second client hello (MS SGC) */
355 ret = ssl3_check_client_hello(s);
359 s->state = SSL3_ST_SR_CLNT_HELLO_C;
361 /* could be sent for a DH cert, even if we
362 * have not asked for it :-) */
363 ret=ssl3_get_client_certificate(s);
364 if (ret <= 0) goto end;
366 s->state=SSL3_ST_SR_KEY_EXCH_A;
370 case SSL3_ST_SR_KEY_EXCH_A:
371 case SSL3_ST_SR_KEY_EXCH_B:
372 ret=ssl3_get_client_key_exchange(s);
373 if (ret <= 0) goto end;
374 s->state=SSL3_ST_SR_CERT_VRFY_A;
377 /* We need to get hashes here so if there is
378 * a client cert, it can be verified */
379 s->method->ssl3_enc->cert_verify_mac(s,
380 &(s->s3->finish_dgst1),
381 &(s->s3->tmp.cert_verify_md[0]));
382 s->method->ssl3_enc->cert_verify_mac(s,
383 &(s->s3->finish_dgst2),
384 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
388 case SSL3_ST_SR_CERT_VRFY_A:
389 case SSL3_ST_SR_CERT_VRFY_B:
391 /* we should decide if we expected this one */
392 ret=ssl3_get_cert_verify(s);
393 if (ret <= 0) goto end;
395 s->state=SSL3_ST_SR_FINISHED_A;
399 case SSL3_ST_SR_FINISHED_A:
400 case SSL3_ST_SR_FINISHED_B:
401 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
402 SSL3_ST_SR_FINISHED_B);
403 if (ret <= 0) goto end;
407 s->state=SSL3_ST_SW_CHANGE_A;
411 case SSL3_ST_SW_CHANGE_A:
412 case SSL3_ST_SW_CHANGE_B:
414 s->session->cipher=s->s3->tmp.new_cipher;
415 if (!s->method->ssl3_enc->setup_key_block(s))
416 { ret= -1; goto end; }
418 ret=ssl3_send_change_cipher_spec(s,
419 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
421 if (ret <= 0) goto end;
422 s->state=SSL3_ST_SW_FINISHED_A;
425 if (!s->method->ssl3_enc->change_cipher_state(s,
426 SSL3_CHANGE_CIPHER_SERVER_WRITE))
434 case SSL3_ST_SW_FINISHED_A:
435 case SSL3_ST_SW_FINISHED_B:
436 ret=ssl3_send_finished(s,
437 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
438 s->method->ssl3_enc->server_finished_label,
439 s->method->ssl3_enc->server_finished_label_len);
440 if (ret <= 0) goto end;
441 s->state=SSL3_ST_SW_FLUSH;
443 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
445 s->s3->tmp.next_state=SSL_ST_OK;
450 /* clean a few things up */
451 ssl3_cleanup_key_block(s);
453 BUF_MEM_free(s->init_buf);
456 /* remove buffering on output */
457 ssl_free_wbio_buffer(s);
462 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
464 s->ctx->stats.sess_accept_good++;
466 s->handshake_func=ssl3_accept;
469 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
475 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
481 if (!s->s3->tmp.reuse_message && !skip)
485 if ((ret=BIO_flush(s->wbio)) <= 0)
490 if ((cb != NULL) && (s->state != state))
494 cb(s,SSL_CB_ACCEPT_LOOP,1);
501 /* BIO_flush(s->wbio); */
504 cb(s,SSL_CB_ACCEPT_EXIT,ret);
509 static int ssl3_send_hello_request(SSL *s)
513 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
515 p=(unsigned char *)s->init_buf->data;
516 *(p++)=SSL3_MT_HELLO_REQUEST;
521 s->state=SSL3_ST_SW_HELLO_REQ_B;
522 /* number of bytes to write */
527 /* SSL3_ST_SW_HELLO_REQ_B */
528 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
531 static int ssl3_check_client_hello(SSL *s)
536 n=ssl3_get_message(s,
540 SSL3_RT_MAX_PLAIN_LENGTH,
542 if (!ok) return((int)n);
543 s->s3->tmp.reuse_message = 1;
544 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
546 /* Throw away what we have done so far in the current handshake,
547 * which will now be aborted. (A full SSL_clear would be too much.)
548 * I hope that tmp.dh is the only thing that may need to be cleared
549 * when a handshake is not completed ... */
551 if (s->s3->tmp.dh != NULL)
553 DH_free(s->s3->tmp.dh);
554 s->s3->tmp.dh = NULL;
562 static int ssl3_get_client_hello(SSL *s)
564 int i,j,ok,al,ret= -1;
567 unsigned char *p,*d,*q;
570 STACK_OF(SSL_CIPHER) *ciphers=NULL;
572 /* We do this so that we will respond with our native type.
573 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
574 * This down switching should be handled by a different method.
575 * If we are SSLv3, we will respond with SSLv3, even if prompted with
578 if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
581 s->state=SSL3_ST_SR_CLNT_HELLO_B;
583 n=ssl3_get_message(s,
584 SSL3_ST_SR_CLNT_HELLO_B,
585 SSL3_ST_SR_CLNT_HELLO_C,
586 SSL3_MT_CLIENT_HELLO,
587 SSL3_RT_MAX_PLAIN_LENGTH,
590 if (!ok) return((int)n);
591 d=p=(unsigned char *)s->init_buf->data;
593 /* use version from inside client hello, not from record header
594 * (may differ: see RFC 2246, Appendix E, second paragraph) */
595 s->client_version=(((int)p[0])<<8)|(int)p[1];
598 /* load the client random */
599 memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
602 /* get the session-id */
608 if (!ssl_get_new_session(s,1))
613 i=ssl_get_prev_session(s,p,j);
615 { /* previous session */
622 if (!ssl_get_new_session(s,1))
629 if ((i == 0) && (j != 0))
631 /* we need a cipher if we are not resuming a session */
632 al=SSL_AD_ILLEGAL_PARAMETER;
633 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
638 /* not enough data */
639 al=SSL_AD_DECODE_ERROR;
640 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
643 if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
650 /* If it is a hit, check that the cipher is in the list */
651 if ((s->hit) && (i > 0))
654 id=s->session->cipher->id;
657 printf("client sent %d ciphers\n",sk_num(ciphers));
659 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
661 c=sk_SSL_CIPHER_value(ciphers,i);
663 printf("client [%2d of %2d]:%s\n",
664 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
674 if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
676 /* Very bad for multi-threading.... */
677 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
682 /* we need to have the cipher in the cipher
683 * list if we are asked to reuse it */
684 al=SSL_AD_ILLEGAL_PARAMETER;
685 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
696 if (p[j] == 0) break;
703 al=SSL_AD_DECODE_ERROR;
704 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
708 /* Worst case, we will use the NULL compression, but if we have other
709 * options, we will now look for them. We have i-1 compression
710 * algorithms from the client, starting at q. */
711 s->s3->tmp.new_compression=NULL;
712 if (s->ctx->comp_methods != NULL)
713 { /* See if we have a match */
716 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
719 comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
732 s->s3->tmp.new_compression=comp;
737 /* TLS does not mind if there is extra stuff */
738 if (s->version == SSL3_VERSION)
742 /* wrong number of bytes,
743 * there could be more to follow */
744 al=SSL_AD_DECODE_ERROR;
745 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
750 /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
755 s->session->compress_meth=(comp == NULL)?0:comp->id;
756 if (s->session->ciphers != NULL)
757 sk_SSL_CIPHER_free(s->session->ciphers);
758 s->session->ciphers=ciphers;
761 al=SSL_AD_ILLEGAL_PARAMETER;
762 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
766 c=ssl3_choose_cipher(s,s->session->ciphers,
767 ssl_get_ciphers_by_id(s));
771 al=SSL_AD_HANDSHAKE_FAILURE;
772 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
775 s->s3->tmp.new_cipher=c;
779 /* Session-id reuse */
780 #ifdef REUSE_CIPHER_BUG
781 STACK_OF(SSL_CIPHER) *sk;
785 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
787 sk=s->session->ciphers;
788 for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
790 c=sk_SSL_CIPHER_value(sk,i);
791 if (c->algorithms & SSL_eNULL)
793 if (SSL_C_IS_EXPORT(c))
797 s->s3->tmp.new_cipher=nc;
799 s->s3->tmp.new_cipher=ec;
801 s->s3->tmp.new_cipher=s->session->cipher;
805 s->s3->tmp.new_cipher=s->session->cipher;
808 /* we now have the following setup.
810 * cipher_list - our prefered list of ciphers
811 * ciphers - the clients prefered list of ciphers
812 * compression - basically ignored right now
813 * ssl version is set - sslv3
814 * s->session - The ssl session has been setup.
815 * s->hit - session reuse flag
816 * s->tmp.new_cipher - the new cipher to use.
823 ssl3_send_alert(s,SSL3_AL_FATAL,al);
826 if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
830 static int ssl3_send_server_hello(SSL *s)
835 unsigned long l,Time;
837 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
839 buf=(unsigned char *)s->init_buf->data;
840 p=s->s3->server_random;
841 Time=time(NULL); /* Time */
843 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
844 /* Do the message type and length last */
847 *(p++)=s->version>>8;
848 *(p++)=s->version&0xff;
851 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
854 /* now in theory we have 3 options to sending back the
855 * session id. If it is a re-use, we send back the
856 * old session-id, if it is a new session, we send
857 * back the new session-id or we send back a 0 length
858 * session-id if we want it to be single use.
859 * Currently I will not implement the '0' length session-id
860 * 12-Jan-98 - I'll now support the '0' length stuff.
862 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
863 s->session->session_id_length=0;
865 sl=s->session->session_id_length;
867 memcpy(p,s->session->session_id,sl);
871 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
874 /* put the compression method */
875 if (s->s3->tmp.new_compression == NULL)
878 *(p++)=s->s3->tmp.new_compression->id;
883 *(d++)=SSL3_MT_SERVER_HELLO;
886 s->state=SSL3_ST_CW_CLNT_HELLO_B;
887 /* number of bytes to write */
892 /* SSL3_ST_CW_CLNT_HELLO_B */
893 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
896 static int ssl3_send_server_done(SSL *s)
900 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
902 p=(unsigned char *)s->init_buf->data;
905 *(p++)=SSL3_MT_SERVER_DONE;
910 s->state=SSL3_ST_SW_SRVR_DONE_B;
911 /* number of bytes to write */
916 /* SSL3_ST_CW_CLNT_HELLO_B */
917 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
920 static int ssl3_send_server_key_exchange(SSL *s)
926 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
943 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
945 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
950 r[0]=r[1]=r[2]=r[3]=NULL;
956 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
958 rsa=s->cert->rsa_tmp_cb(s,
959 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
960 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
963 al=SSL_AD_HANDSHAKE_FAILURE;
964 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
967 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
972 al=SSL_AD_HANDSHAKE_FAILURE;
973 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
978 s->s3->tmp.use_rsa_tmp=1;
986 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
987 dhp=s->cert->dh_tmp_cb(s,
988 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
989 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
992 al=SSL_AD_HANDSHAKE_FAILURE;
993 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
997 if (s->s3->tmp.dh != NULL)
1000 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, SSL_R_INTERNAL_ERROR);
1004 if ((dh=DHparams_dup(dhp)) == NULL)
1006 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1011 if ((dhp->pub_key == NULL ||
1012 dhp->priv_key == NULL ||
1013 (s->options & SSL_OP_SINGLE_DH_USE)))
1015 if(!DH_generate_key(dh))
1017 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1024 dh->pub_key=BN_dup(dhp->pub_key);
1025 dh->priv_key=BN_dup(dhp->priv_key);
1026 if ((dh->pub_key == NULL) ||
1027 (dh->priv_key == NULL))
1029 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1040 al=SSL_AD_HANDSHAKE_FAILURE;
1041 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1044 for (i=0; r[i] != NULL; i++)
1046 nr[i]=BN_num_bytes(r[i]);
1050 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1052 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1055 al=SSL_AD_DECODE_ERROR;
1058 kn=EVP_PKEY_size(pkey);
1066 if (!BUF_MEM_grow(buf,n+4+kn))
1068 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1071 d=(unsigned char *)s->init_buf->data;
1074 for (i=0; r[i] != NULL; i++)
1084 /* n is the length of the params, they start at &(d[4])
1085 * and p points to the space at the end. */
1087 if (pkey->type == EVP_PKEY_RSA)
1091 for (num=2; num > 0; num--)
1093 EVP_DigestInit(&md_ctx,(num == 2)
1094 ?s->ctx->md5:s->ctx->sha1);
1095 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1096 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1097 EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1098 EVP_DigestFinal(&md_ctx,q,
1099 (unsigned int *)&i);
1103 if (RSA_sign(NID_md5_sha1, md_buf, j,
1104 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1106 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1114 #if !defined(NO_DSA)
1115 if (pkey->type == EVP_PKEY_DSA)
1118 EVP_SignInit(&md_ctx,EVP_dss1());
1119 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1120 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1121 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1122 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1123 (unsigned int *)&i,pkey))
1125 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1134 /* Is this error check actually needed? */
1135 al=SSL_AD_HANDSHAKE_FAILURE;
1136 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1141 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1144 /* we should now have things packed up, so lets send
1150 s->state = SSL3_ST_SW_KEY_EXCH_B;
1151 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1153 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1158 static int ssl3_send_certificate_request(SSL *s)
1160 unsigned char *p,*d;
1162 STACK_OF(X509_NAME) *sk=NULL;
1166 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1170 d=p=(unsigned char *)&(buf->data[4]);
1172 /* get the list of acceptable cert types */
1174 n=ssl3_get_req_cert_type(s,p);
1183 sk=SSL_get_client_CA_list(s);
1187 for (i=0; i<sk_X509_NAME_num(sk); i++)
1189 name=sk_X509_NAME_value(sk,i);
1190 j=i2d_X509_NAME(name,NULL);
1191 if (!BUF_MEM_grow(buf,4+n+j+2))
1193 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1196 p=(unsigned char *)&(buf->data[4+n]);
1197 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1200 i2d_X509_NAME(name,&p);
1207 i2d_X509_NAME(name,&p);
1208 j-=2; s2n(j,d); j+=2;
1214 /* else no CA names */
1215 p=(unsigned char *)&(buf->data[4+off]);
1218 d=(unsigned char *)buf->data;
1219 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1222 /* we should now have things packed up, so lets send
1227 #ifdef NETSCAPE_HANG_BUG
1228 p=(unsigned char *)s->init_buf->data + s->init_num;
1231 *(p++)=SSL3_MT_SERVER_DONE;
1240 /* SSL3_ST_SW_CERT_REQ_B */
1241 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1246 static int ssl3_get_client_key_exchange(SSL *s)
1254 EVP_PKEY *pkey=NULL;
1261 n=ssl3_get_message(s,
1262 SSL3_ST_SR_KEY_EXCH_A,
1263 SSL3_ST_SR_KEY_EXCH_B,
1264 SSL3_MT_CLIENT_KEY_EXCHANGE,
1268 if (!ok) return((int)n);
1269 p=(unsigned char *)s->init_buf->data;
1271 l=s->s3->tmp.new_cipher->algorithms;
1276 /* FIX THIS UP EAY EAY EAY EAY */
1277 if (s->s3->tmp.use_rsa_tmp)
1279 if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1280 rsa=s->cert->rsa_tmp;
1281 /* Don't do a callback because rsa_tmp should
1282 * be sent already */
1285 al=SSL_AD_HANDSHAKE_FAILURE;
1286 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1293 pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1294 if ( (pkey == NULL) ||
1295 (pkey->type != EVP_PKEY_RSA) ||
1296 (pkey->pkey.rsa == NULL))
1298 al=SSL_AD_HANDSHAKE_FAILURE;
1299 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1306 if (s->version > SSL3_VERSION)
1311 if (!(s->options & SSL_OP_TLS_D5_BUG))
1313 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1323 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1325 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1327 al=SSL_AD_DECODE_ERROR;
1328 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1332 if (!((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1334 /* The premaster secret must contain the same version number as the
1335 * ClientHello to detect version rollback attacks (strangely, the
1336 * protocol does not offer such protection for DH ciphersuites).
1337 * However, buggy clients exist that send the negotiated protocol
1338 * version instead if the server does not support the requested
1340 * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1341 if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1342 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1344 al=SSL_AD_DECODE_ERROR;
1345 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1350 s->session->master_key_length=
1351 s->method->ssl3_enc->generate_master_secret(s,
1352 s->session->master_key,
1359 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1364 if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1366 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1376 if (n == 0L) /* the parameters are in the cert */
1378 al=SSL_AD_HANDSHAKE_FAILURE;
1379 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1384 if (s->s3->tmp.dh == NULL)
1386 al=SSL_AD_HANDSHAKE_FAILURE;
1387 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1391 dh_srvr=s->s3->tmp.dh;
1394 pub=BN_bin2bn(p,i,NULL);
1397 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1401 i=DH_compute_key(p,pub,dh_srvr);
1405 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1409 DH_free(s->s3->tmp.dh);
1414 s->session->master_key_length=
1415 s->method->ssl3_enc->generate_master_secret(s,
1416 s->session->master_key,p,i);
1421 al=SSL_AD_HANDSHAKE_FAILURE;
1422 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1428 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1429 #if !defined(NO_DH) || !defined(NO_RSA)
1435 static int ssl3_get_cert_verify(SSL *s)
1437 EVP_PKEY *pkey=NULL;
1444 n=ssl3_get_message(s,
1445 SSL3_ST_SR_CERT_VRFY_A,
1446 SSL3_ST_SR_CERT_VRFY_B,
1451 if (!ok) return((int)n);
1453 if (s->session->peer != NULL)
1455 peer=s->session->peer;
1456 pkey=X509_get_pubkey(peer);
1457 type=X509_certificate_type(peer,pkey);
1465 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1467 s->s3->tmp.reuse_message=1;
1468 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1470 al=SSL_AD_UNEXPECTED_MESSAGE;
1471 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1480 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1481 al=SSL_AD_UNEXPECTED_MESSAGE;
1485 if (!(type & EVP_PKT_SIGN))
1487 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1488 al=SSL_AD_ILLEGAL_PARAMETER;
1492 if (s->s3->change_cipher_spec)
1494 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1495 al=SSL_AD_UNEXPECTED_MESSAGE;
1499 /* we now have a signature that we need to verify */
1500 p=(unsigned char *)s->init_buf->data;
1505 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1506 al=SSL_AD_DECODE_ERROR;
1510 j=EVP_PKEY_size(pkey);
1511 if ((i > j) || (n > j) || (n <= 0))
1513 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1514 al=SSL_AD_DECODE_ERROR;
1519 if (pkey->type == EVP_PKEY_RSA)
1521 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1522 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1526 al=SSL_AD_DECRYPT_ERROR;
1527 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1532 al=SSL_AD_DECRYPT_ERROR;
1533 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1540 if (pkey->type == EVP_PKEY_DSA)
1542 j=DSA_verify(pkey->save_type,
1543 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1544 SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1548 al=SSL_AD_DECRYPT_ERROR;
1549 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1556 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1557 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1566 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1569 EVP_PKEY_free(pkey);
1573 static int ssl3_get_client_certificate(SSL *s)
1575 int i,ok,al,ret= -1;
1577 unsigned long l,nc,llen,n;
1578 unsigned char *p,*d,*q;
1579 STACK_OF(X509) *sk=NULL;
1581 n=ssl3_get_message(s,
1585 #if defined(MSDOS) && !defined(WIN32)
1586 1024*30, /* 30k max cert list :-) */
1588 1024*100, /* 100k max cert list :-) */
1592 if (!ok) return((int)n);
1594 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1596 if ( (s->verify_mode & SSL_VERIFY_PEER) &&
1597 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1599 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1600 al=SSL_AD_HANDSHAKE_FAILURE;
1603 /* If tls asked for a client cert, the client must return a 0 list */
1604 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1606 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1607 al=SSL_AD_UNEXPECTED_MESSAGE;
1610 s->s3->tmp.reuse_message=1;
1614 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1616 al=SSL_AD_UNEXPECTED_MESSAGE;
1617 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1620 d=p=(unsigned char *)s->init_buf->data;
1622 if ((sk=sk_X509_new_null()) == NULL)
1624 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1631 al=SSL_AD_DECODE_ERROR;
1632 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1635 for (nc=0; nc<llen; )
1638 if ((l+nc+3) > llen)
1640 al=SSL_AD_DECODE_ERROR;
1641 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1646 x=d2i_X509(NULL,&p,l);
1649 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1654 al=SSL_AD_DECODE_ERROR;
1655 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1658 if (!sk_X509_push(sk,x))
1660 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1667 if (sk_X509_num(sk) <= 0)
1669 /* TLS does not mind 0 certs returned */
1670 if (s->version == SSL3_VERSION)
1672 al=SSL_AD_HANDSHAKE_FAILURE;
1673 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1676 /* Fail for TLS only if we required a certificate */
1677 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1678 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1680 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1681 al=SSL_AD_HANDSHAKE_FAILURE;
1687 i=ssl_verify_cert_chain(s,sk);
1690 al=ssl_verify_alarm_type(s->verify_result);
1691 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1696 if (s->session->peer != NULL) /* This should not be needed */
1697 X509_free(s->session->peer);
1698 s->session->peer=sk_X509_shift(sk);
1699 s->session->verify_result = s->verify_result;
1701 /* With the current implementation, sess_cert will always be NULL
1702 * when we arrive here. */
1703 if (s->session->sess_cert == NULL)
1705 s->session->sess_cert = ssl_sess_cert_new();
1706 if (s->session->sess_cert == NULL)
1708 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1712 if (s->session->sess_cert->cert_chain != NULL)
1713 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1714 s->session->sess_cert->cert_chain=sk;
1715 /* Inconsistency alert: cert_chain does *not* include the
1716 * peer's own certificate, while we do include it in s3_clnt.c */
1724 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1727 if (x != NULL) X509_free(x);
1728 if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1732 int ssl3_send_server_certificate(SSL *s)
1737 if (s->state == SSL3_ST_SW_CERT_A)
1739 x=ssl_get_server_send_cert(s);
1742 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1746 l=ssl3_output_cert_chain(s,x);
1747 s->state=SSL3_ST_SW_CERT_B;
1752 /* SSL3_ST_SW_CERT_B */
1753 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));