ssl/s2_srvr.c

   1 /* ssl/s2_srvr.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #ifndef NO_RSA
  60 #include <stdio.h>
  61 #include <openssl/bio.h>
  62 #include <openssl/rand.h>
  63 #include <openssl/objects.h>
  64 #include "ssl_locl.h"
  65 #include <openssl/evp.h>
  66
  67 static SSL_METHOD *ssl2_get_server_method(int ver);
  68 static int get_client_master_key(SSL *s);
  69 static int get_client_hello(SSL *s);
  70 static int server_hello(SSL *s);
  71 static int get_client_finished(SSL *s);
  72 static int server_verify(SSL *s);
  73 static int server_finish(SSL *s);
  74 static int request_certificate(SSL *s);
  75 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
  76         unsigned char *to,int padding);
  77 #define BREAK   break
  78
  79 static SSL_METHOD *ssl2_get_server_method(int ver)
  80         {
  81         if (ver == SSL2_VERSION)
  82                 return(SSLv2_server_method());
  83         else
  84                 return(NULL);
  85         }
  86
  87 SSL_METHOD *SSLv2_server_method(void)
  88         {
  89         static int init=1;
  90         static SSL_METHOD SSLv2_server_data;
  91
  92         if (init)
  93                 {
  94                 memcpy((char *)&SSLv2_server_data,(char *)sslv2_base_method(),
  95                         sizeof(SSL_METHOD));
  96                 SSLv2_server_data.ssl_accept=ssl2_accept;
  97                 SSLv2_server_data.get_ssl_method=ssl2_get_server_method;
  98                 init=0;
  99                 }
 100         return(&SSLv2_server_data);
 101         }
 102
 103 int ssl2_accept(SSL *s)
 104         {
 105         unsigned long l=time(NULL);
 106         BUF_MEM *buf=NULL;
 107         int ret= -1;
 108         long num1;
 109         void (*cb)()=NULL;
 110         int new_state,state;
 111
 112         RAND_seed(&l,sizeof(l));
 113         ERR_clear_error();
 114         clear_sys_error();
 115
 116         if (s->info_callback != NULL)
 117                 cb=s->info_callback;
 118         else if (s->ctx->info_callback != NULL)
 119                 cb=s->ctx->info_callback;
 120
 121         /* init things to blank */
 122         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 123         s->in_handshake++;
 124
 125         if (((s->session == NULL) || (s->session->sess_cert == NULL)) &&
 126                 (s->cert == NULL))
 127                 {
 128                 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 129                 return(-1);
 130                 }
 131
 132         clear_sys_error();
 133         for (;;)
 134                 {
 135                 state=s->state;
 136
 137                 switch (s->state)
 138                         {
 139                 case SSL_ST_BEFORE:
 140                 case SSL_ST_ACCEPT:
 141                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 142                 case SSL_ST_OK|SSL_ST_ACCEPT:
 143
 144                         s->server=1;
 145                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 146
 147                         s->version=SSL2_VERSION;
 148                         s->type=SSL_ST_ACCEPT;
 149
 150                         buf=s->init_buf;
 151                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
 152                                 { ret= -1; goto end; }
 153                         if (!BUF_MEM_grow(buf,(int)
 154                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 155                                 { ret= -1; goto end; }
 156                         s->init_buf=buf;
 157                         s->init_num=0;
 158                         s->ctx->stats.sess_accept++;
 159                         s->handshake_func=ssl2_accept;
 160                         s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 161                         BREAK;
 162
 163                 case SSL2_ST_GET_CLIENT_HELLO_A:
 164                 case SSL2_ST_GET_CLIENT_HELLO_B:
 165                 case SSL2_ST_GET_CLIENT_HELLO_C:
 166                         s->shutdown=0;
 167                         ret=get_client_hello(s);
 168                         if (ret <= 0) goto end;
 169                         s->init_num=0;
 170                         s->state=SSL2_ST_SEND_SERVER_HELLO_A;
 171                         BREAK;
 172
 173                 case SSL2_ST_SEND_SERVER_HELLO_A:
 174                 case SSL2_ST_SEND_SERVER_HELLO_B:
 175                         ret=server_hello(s);
 176                         if (ret <= 0) goto end;
 177                         s->init_num=0;
 178                         if (!s->hit)
 179                                 {
 180                                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;
 181                                 BREAK;
 182                                 }
 183                         else
 184                                 {
 185                                 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 186                                 BREAK;
 187                                 }
 188                 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
 189                 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
 190                         ret=get_client_master_key(s);
 191                         if (ret <= 0) goto end;
 192                         s->init_num=0;
 193                         s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 194                         BREAK;
 195
 196                 case SSL2_ST_SERVER_START_ENCRYPTION:
 197                         /* Ok we how have sent all the stuff needed to
 198                          * start encrypting, the next packet back will
 199                          * be encrypted. */
 200                         if (!ssl2_enc_init(s,0))
 201                                 { ret= -1; goto end; }
 202                         s->s2->clear_text=0;
 203                         s->state=SSL2_ST_SEND_SERVER_VERIFY_A;
 204                         BREAK;
 205
 206                 case SSL2_ST_SEND_SERVER_VERIFY_A:
 207                 case SSL2_ST_SEND_SERVER_VERIFY_B:
 208                         ret=server_verify(s);
 209                         if (ret <= 0) goto end;
 210                         s->init_num=0;
 211                         if (s->hit)
 212                                 {
 213                                 /* If we are in here, we have been
 214                                  * buffering the output, so we need to
 215                                  * flush it and remove buffering from
 216                                  * future traffic */
 217                                 s->state=SSL2_ST_SEND_SERVER_VERIFY_C;
 218                                 BREAK;
 219                                 }
 220                         else
 221                                 {
 222                                 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 223                                 break;
 224                                 }
 225
 226                 case SSL2_ST_SEND_SERVER_VERIFY_C:
 227                         /* get the number of bytes to write */
 228                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 229                         if (num1 != 0)
 230                                 {
 231                                 s->rwstate=SSL_WRITING;
 232                                 num1=BIO_flush(s->wbio);
 233                                 if (num1 <= 0) { ret= -1; goto end; }
 234                                 s->rwstate=SSL_NOTHING;
 235                                 }
 236
 237                         /* flushed and now remove buffering */
 238                         s->wbio=BIO_pop(s->wbio);
 239
 240                         s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 241                         BREAK;
 242
 243                 case SSL2_ST_GET_CLIENT_FINISHED_A:
 244                 case SSL2_ST_GET_CLIENT_FINISHED_B:
 245                         ret=get_client_finished(s);
 246                         if (ret <= 0)
 247                                 goto end;
 248                         s->init_num=0;
 249                         s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
 250                         BREAK;
 251
 252                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
 253                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
 254                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
 255                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
 256                         /* don't do a 'request certificate' if we
 257                          * don't want to, or we already have one, and
 258                          * we only want to do it once. */
 259                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 260                                 ((s->session->peer != NULL) &&
 261                                 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 262                                 {
 263                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 264                                 break;
 265                                 }
 266                         else
 267                                 {
 268                                 ret=request_certificate(s);
 269                                 if (ret <= 0) goto end;
 270                                 s->init_num=0;
 271                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 272                                 }
 273                         BREAK;
 274
 275                 case SSL2_ST_SEND_SERVER_FINISHED_A:
 276                 case SSL2_ST_SEND_SERVER_FINISHED_B:
 277                         ret=server_finish(s);
 278                         if (ret <= 0) goto end;
 279                         s->init_num=0;
 280                         s->state=SSL_ST_OK;
 281                         break;
 282
 283                 case SSL_ST_OK:
 284                         BUF_MEM_free(s->init_buf);
 285                         ssl_free_wbio_buffer(s);
 286                         s->init_buf=NULL;
 287                         s->init_num=0;
 288                 /*      ERR_clear_error();*/
 289
 290                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 291
 292                         s->ctx->stats.sess_accept_good++;
 293                         /* s->server=1; */
 294                         ret=1;
 295
 296                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 297
 298                         goto end;
 299                         /* BREAK; */
 300
 301                 default:
 302                         SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);
 303                         ret= -1;
 304                         goto end;
 305                         /* BREAK; */
 306                         }
 307
 308                 if ((cb != NULL) && (s->state != state))
 309                         {
 310                         new_state=s->state;
 311                         s->state=state;
 312                         cb(s,SSL_CB_ACCEPT_LOOP,1);
 313                         s->state=new_state;
 314                         }
 315                 }
 316 end:
 317         s->in_handshake--;
 318         if (cb != NULL)
 319                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 320         return(ret);
 321         }
 322
 323 static int get_client_master_key(SSL *s)
 324         {
 325         int export,i,n,keya,ek;
 326         unsigned char *p;
 327         SSL_CIPHER *cp;
 328         const EVP_CIPHER *c;
 329         const EVP_MD *md;
 330
 331         p=(unsigned char *)s->init_buf->data;
 332         if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)
 333                 {
 334                 i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);
 335
 336                 if (i < (10-s->init_num))
 337                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 338                 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)
 339                         {
 340                         if (p[-1] != SSL2_MT_ERROR)
 341                                 {
 342                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 343                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
 344                                 }
 345                         else
 346                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
 347                                         SSL_R_PEER_ERROR);
 348                         return(-1);
 349                         }
 350
 351                 cp=ssl2_get_cipher_by_char(p);
 352                 if (cp == NULL)
 353                         {
 354                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 355                         SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
 356                                 SSL_R_NO_CIPHER_MATCH);
 357                         return(-1);
 358                         }
 359                 s->session->cipher= cp;
 360
 361                 p+=3;
 362                 n2s(p,i); s->s2->tmp.clear=i;
 363                 n2s(p,i); s->s2->tmp.enc=i;
 364                 n2s(p,i); s->session->key_arg_length=i;
 365                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
 366                 s->init_num=0;
 367                 }
 368
 369         /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
 370         p=(unsigned char *)s->init_buf->data;
 371         keya=s->session->key_arg_length;
 372         n=s->s2->tmp.clear+s->s2->tmp.enc+keya - s->init_num;
 373         i=ssl2_read(s,(char *)&(p[s->init_num]),n);
 374         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 375
 376         memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
 377                 (unsigned int)keya);
 378
 379         if (s->session->sess_cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
 380                 {
 381                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 382                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
 383                 return(-1);
 384                 }
 385         i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,
 386                 &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),
 387                 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
 388
 389         export=SSL_C_IS_EXPORT(s->session->cipher);
 390
 391         if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
 392                 {
 393                 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 394                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 395                 return(0);
 396                 }
 397
 398         if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 399                 {
 400                 export=1;
 401                 ek=8;
 402                 }
 403         else
 404                 ek=5;
 405
 406         /* bad decrypt */
 407 #if 1
 408         /* If a bad decrypt, continue with protocol but with a
 409          * dud master secret */
 410         if ((i < 0) ||
 411                 ((!export && (i != EVP_CIPHER_key_length(c)))
 412                 || ( export && ((i != ek) || (s->s2->tmp.clear+i !=
 413                         EVP_CIPHER_key_length(c))))))
 414                 {
 415                 if (export)
 416                         i=ek;
 417                 else
 418                         i=EVP_CIPHER_key_length(c);
 419                 RAND_bytes(p,i);
 420                 }
 421 #else
 422         if (i < 0)
 423                 {
 424                 error=1;
 425                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
 426                 }
 427         /* incorrect number of key bytes for non export cipher */
 428         else if ((!export && (i != EVP_CIPHER_key_length(c)))
 429                 || ( export && ((i != ek) || (s->s2->tmp.clear+i !=
 430                         EVP_CIPHER_key_length(c)))))
 431                 {
 432                 error=1;
 433                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
 434                 }
 435         if (error)
 436                 {
 437                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 438                 return(-1);
 439                 }
 440 #endif
 441
 442         if (export) i+=s->s2->tmp.clear;
 443         s->session->master_key_length=i;
 444         memcpy(s->session->master_key,p,(unsigned int)i);
 445         return(1);
 446         }
 447
 448 static int get_client_hello(SSL *s)
 449         {
 450         int i,n;
 451         unsigned char *p;
 452         STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */
 453         STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */
 454         int z;
 455
 456         /* This is a bit of a hack to check for the correct packet
 457          * type the first time round. */
 458         if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
 459                 {
 460                 s->first_packet=1;
 461                 s->state=SSL2_ST_GET_CLIENT_HELLO_B;
 462                 }
 463
 464         p=(unsigned char *)s->init_buf->data;
 465         if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
 466                 {
 467                 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
 468                 if (i < (9-s->init_num))
 469                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 470
 471                 if (*(p++) != SSL2_MT_CLIENT_HELLO)
 472                         {
 473                         if (p[-1] != SSL2_MT_ERROR)
 474                                 {
 475                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 476                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
 477                                 }
 478                         else
 479                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
 480                         return(-1);
 481                         }
 482                 n2s(p,i);
 483                 if (i < s->version) s->version=i;
 484                 n2s(p,i); s->s2->tmp.cipher_spec_length=i;
 485                 n2s(p,i); s->s2->tmp.session_id_length=i;
 486                 n2s(p,i); s->s2->challenge_length=i;
 487                 if (    (i < SSL2_MIN_CHALLENGE_LENGTH) ||
 488                         (i > SSL2_MAX_CHALLENGE_LENGTH))
 489                         {
 490                         SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
 491                         return(-1);
 492                         }
 493                 s->state=SSL2_ST_GET_CLIENT_HELLO_C;
 494                 s->init_num=0;
 495                 }
 496
 497         /* SSL2_ST_GET_CLIENT_HELLO_C */
 498         p=(unsigned char *)s->init_buf->data;
 499         n=s->s2->tmp.cipher_spec_length+s->s2->challenge_length+
 500                 s->s2->tmp.session_id_length-s->init_num;
 501         i=ssl2_read(s,(char *)&(p[s->init_num]),n);
 502         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 503
 504         /* get session-id before cipher stuff so we can get out session
 505          * structure if it is cached */
 506         /* session-id */
 507         if ((s->s2->tmp.session_id_length != 0) &&
 508                 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
 509                 {
 510                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 511                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
 512                 return(-1);
 513                 }
 514
 515         if (s->s2->tmp.session_id_length == 0)
 516                 {
 517                 if (!ssl_get_new_session(s,1))
 518                         {
 519                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 520                         return(-1);
 521                         }
 522                 }
 523         else
 524                 {
 525                 i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),
 526                         s->s2->tmp.session_id_length);
 527                 if (i == 1)
 528                         { /* previous session */
 529                         s->hit=1;
 530                         }
 531                 else if (i == -1)
 532                         {
 533                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 534                         return(-1);
 535                         }
 536                 else
 537                         {
 538                         if (s->cert == NULL)
 539                                 {
 540                                 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 541                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
 542                                 return(-1);
 543                                 }
 544
 545                         if (!ssl_get_new_session(s,1))
 546                                 {
 547                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 548                                 return(-1);
 549                                 }
 550                         }
 551                 }
 552
 553         if (!s->hit)
 554                 {
 555                 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
 556                         &s->session->ciphers);
 557                 if (cs == NULL) goto mem_err;
 558
 559                 cl=ssl_get_ciphers_by_id(s);
 560
 561                 for (z=0; z<sk_SSL_CIPHER_num(cs); z++)
 562                         {
 563                         if (sk_SSL_CIPHER_find(cl,sk_SSL_CIPHER_value(cs,z)) < 0)
 564                                 {
 565                                 sk_SSL_CIPHER_delete(cs,z);
 566                                 z--;
 567                                 }
 568                         }
 569
 570                 /* s->session->ciphers should now have a list of
 571                  * ciphers that are on both the client and server.
 572                  * This list is ordered by the order the client sent
 573                  * the ciphers.
 574                  */
 575                 }
 576         p+=s->s2->tmp.cipher_spec_length;
 577         /* done cipher selection */
 578
 579         /* session id extracted already */
 580         p+=s->s2->tmp.session_id_length;
 581
 582         /* challenge */
 583         memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
 584         return(1);
 585 mem_err:
 586         SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 587         return(0);
 588         }
 589
 590 static int server_hello(SSL *s)
 591         {
 592         unsigned char *p,*d;
 593         int n,hit;
 594         STACK_OF(SSL_CIPHER) *sk;
 595
 596         p=(unsigned char *)s->init_buf->data;
 597         if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
 598                 {
 599                 d=p+11;
 600                 *(p++)=SSL2_MT_SERVER_HELLO;            /* type */
 601                 hit=s->hit;
 602                 *(p++)=(unsigned char)hit;
 603                 if (!hit)
 604                         {                       /* else add cert to session */
 605                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
 606                         if (s->session->sess_cert != NULL)
 607                                 ssl_cert_free(s->session->sess_cert);
 608                         s->session->sess_cert=s->cert;
 609                         }
 610                 else    /* We have a session id-cache hit, if the
 611                          * session-id has no certificate listed against
 612                          * the 'cert' structure, grab the 'old' one
 613                          * listed against the SSL connection */
 614                         {
 615                         if (s->session->sess_cert == NULL)
 616                                 {
 617                                 CRYPTO_add(&s->cert->references,1,
 618                                         CRYPTO_LOCK_SSL_CERT);
 619                                 s->session->sess_cert=s->cert;
 620                                 }
 621                         }
 622
 623                 if (s->session->sess_cert == NULL)
 624                         {
 625                         ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 626                         SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
 627                         return(-1);
 628                         }
 629
 630                 if (hit)
 631                         {
 632                         *(p++)=0;               /* no certificate type */
 633                         s2n(s->version,p);      /* version */
 634                         s2n(0,p);               /* cert len */
 635                         s2n(0,p);               /* ciphers len */
 636                         }
 637                 else
 638                         {
 639                         /* EAY EAY */
 640                         /* put certificate type */
 641                         *(p++)=SSL2_CT_X509_CERTIFICATE;
 642                         s2n(s->version,p);      /* version */
 643                         n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
 644                         s2n(n,p);               /* certificate length */
 645                         i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
 646                         n=0;
 647
 648                         /* lets send out the ciphers we like in the
 649                          * prefered order */
 650                         sk= s->session->ciphers;
 651                         n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d);
 652                         d+=n;
 653                         s2n(n,p);               /* add cipher length */
 654                         }
 655
 656                 /* make and send conn_id */
 657                 s2n(SSL2_CONNECTION_ID_LENGTH,p);       /* add conn_id length */
 658                 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
 659                 RAND_bytes(s->s2->conn_id,(int)s->s2->conn_id_length);
 660                 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
 661                 d+=SSL2_CONNECTION_ID_LENGTH;
 662
 663                 s->state=SSL2_ST_SEND_SERVER_HELLO_B;
 664                 s->init_num=d-(unsigned char *)s->init_buf->data;
 665                 s->init_off=0;
 666                 }
 667         /* SSL2_ST_SEND_SERVER_HELLO_B */
 668         /* If we are using TCP/IP, the performace is bad if we do 2
 669          * writes without a read between them.  This occurs when
 670          * Session-id reuse is used, so I will put in a buffering module
 671          */
 672         if (s->hit)
 673                 {
 674                 if (!ssl_init_wbio_buffer(s,1)) return(-1);
 675                 }
 676
 677         return(ssl2_do_write(s));
 678         }
 679
 680 static int get_client_finished(SSL *s)
 681         {
 682         unsigned char *p;
 683         int i;
 684
 685         p=(unsigned char *)s->init_buf->data;
 686         if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
 687                 {
 688                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 689                 if (i < 1-s->init_num)
 690                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 691
 692                 if (*p != SSL2_MT_CLIENT_FINISHED)
 693                         {
 694                         if (*p != SSL2_MT_ERROR)
 695                                 {
 696                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 697                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 698                                 }
 699                         else
 700                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
 701                         return(-1);
 702                         }
 703                 s->init_num=0;
 704                 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
 705                 }
 706
 707         /* SSL2_ST_GET_CLIENT_FINISHED_B */
 708         i=ssl2_read(s,(char *)&(p[s->init_num]),s->s2->conn_id_length-s->init_num);
 709         if (i < (int)s->s2->conn_id_length-s->init_num)
 710                 {
 711                 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 712                 }
 713         if (memcmp(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length) != 0)
 714                 {
 715                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 716                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
 717                 return(-1);
 718                 }
 719         return(1);
 720         }
 721
 722 static int server_verify(SSL *s)
 723         {
 724         unsigned char *p;
 725
 726         if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
 727                 {
 728                 p=(unsigned char *)s->init_buf->data;
 729                 *(p++)=SSL2_MT_SERVER_VERIFY;
 730                 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
 731                 /* p+=s->s2->challenge_length; */
 732
 733                 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
 734                 s->init_num=s->s2->challenge_length+1;
 735                 s->init_off=0;
 736                 }
 737         return(ssl2_do_write(s));
 738         }
 739
 740 static int server_finish(SSL *s)
 741         {
 742         unsigned char *p;
 743
 744         if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
 745                 {
 746                 p=(unsigned char *)s->init_buf->data;
 747                 *(p++)=SSL2_MT_SERVER_FINISHED;
 748
 749                 memcpy(p,s->session->session_id,
 750                         (unsigned int)s->session->session_id_length);
 751                 /* p+=s->session->session_id_length; */
 752
 753                 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
 754                 s->init_num=s->session->session_id_length+1;
 755                 s->init_off=0;
 756                 }
 757
 758         /* SSL2_ST_SEND_SERVER_FINISHED_B */
 759         return(ssl2_do_write(s));
 760         }
 761
 762 /* send the request and check the response */
 763 static int request_certificate(SSL *s)
 764         {
 765         unsigned char *p,*p2,*buf2;
 766         unsigned char *ccd;
 767         int i,j,ctype,ret= -1;
 768         X509 *x509=NULL;
 769         STACK_OF(X509) *sk=NULL;
 770
 771         ccd=s->s2->tmp.ccl;
 772         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
 773                 {
 774                 p=(unsigned char *)s->init_buf->data;
 775                 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
 776                 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
 777                 RAND_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 778                 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 779
 780                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
 781                 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
 782                 s->init_off=0;
 783                 }
 784
 785         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
 786                 {
 787                 i=ssl2_do_write(s);
 788                 if (i <= 0)
 789                         {
 790                         ret=i;
 791                         goto end;
 792                         }
 793
 794                 s->init_num=0;
 795                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
 796                 }
 797
 798         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
 799                 {
 800                 p=(unsigned char *)s->init_buf->data;
 801                 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num);
 802                 if (i < 3)
 803                         {
 804                         ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
 805                         goto end;
 806                         }
 807
 808                 if ((*p == SSL2_MT_ERROR) && (i >= 3))
 809                         {
 810                         n2s(p,i);
 811                         if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
 812                                 {
 813                                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 814                                 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
 815                                 goto end;
 816                                 }
 817                         ret=1;
 818                         goto end;
 819                         }
 820                 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (i < 6))
 821                         {
 822                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 823                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
 824                         goto end;
 825                         }
 826                 /* ok we have a response */
 827                 /* certificate type, there is only one right now. */
 828                 ctype= *(p++);
 829                 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 830                         {
 831                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 832                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
 833                         goto end;
 834                         }
 835                 n2s(p,i); s->s2->tmp.clen=i;
 836                 n2s(p,i); s->s2->tmp.rlen=i;
 837                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
 838                 s->init_num=0;
 839                 }
 840
 841         /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
 842         p=(unsigned char *)s->init_buf->data;
 843         j=s->s2->tmp.clen+s->s2->tmp.rlen-s->init_num;
 844         i=ssl2_read(s,(char *)&(p[s->init_num]),j);
 845         if (i < j)
 846                 {
 847                 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
 848                 goto end;
 849                 }
 850
 851         x509=(X509 *)d2i_X509(NULL,&p,(long)s->s2->tmp.clen);
 852         if (x509 == NULL)
 853                 {
 854                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
 855                 goto msg_end;
 856                 }
 857
 858         if (((sk=sk_X509_new_null()) == NULL) || (!sk_X509_push(sk,x509)))
 859                 {
 860                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 861                 goto msg_end;
 862                 }
 863
 864         i=ssl_verify_cert_chain(s,sk);
 865
 866         if (i)  /* we like the packet, now check the chksum */
 867                 {
 868                 EVP_MD_CTX ctx;
 869                 EVP_PKEY *pkey=NULL;
 870
 871                 EVP_VerifyInit(&ctx,s->ctx->rsa_md5);
 872                 EVP_VerifyUpdate(&ctx,s->s2->key_material,
 873                         (unsigned int)s->s2->key_material_length);
 874                 EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 875
 876                 i=i2d_X509(s->session->sess_cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
 877                 buf2=(unsigned char *)Malloc((unsigned int)i);
 878                 if (buf2 == NULL)
 879                         {
 880                         SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 881                         goto msg_end;
 882                         }
 883                 p2=buf2;
 884                 i=i2d_X509(s->session->sess_cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
 885                 EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i);
 886                 Free(buf2);
 887
 888                 pkey=X509_get_pubkey(x509);
 889                 if (pkey == NULL) goto end;
 890                 i=EVP_VerifyFinal(&ctx,p,s->s2->tmp.rlen,pkey);
 891                 EVP_PKEY_free(pkey);
 892                 memset(&ctx,0,sizeof(ctx));
 893
 894                 if (i)
 895                         {
 896                         if (s->session->peer != NULL)
 897                                 X509_free(s->session->peer);
 898                         s->session->peer=x509;
 899                         CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
 900                         ret=1;
 901                         goto end;
 902                         }
 903                 else
 904                         {
 905                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
 906                         goto msg_end;
 907                         }
 908                 }
 909         else
 910                 {
 911 msg_end:
 912                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 913                 }
 914 end:
 915         sk_X509_free(sk);
 916         X509_free(x509);
 917         return(ret);
 918         }
 919
 920 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
 921              unsigned char *to, int padding)
 922         {
 923         RSA *rsa;
 924         int i;
 925
 926         if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))
 927                 {
 928                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
 929                 return(-1);
 930                 }
 931         if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)
 932                 {
 933                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
 934                 return(-1);
 935                 }
 936         rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
 937
 938         /* we have the public key */
 939         i=RSA_private_decrypt(len,from,to,rsa,padding);
 940         if (i < 0)
 941                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
 942         return(i);
 943         }
 944 #endif