ssl/s2_clnt.c

   1 /* ssl/s2_clnt.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 #include "ssl_locl.h"
  60 #ifndef NO_SSL2
  61 #include <stdio.h>
  62 #include <openssl/rand.h>
  63 #include <openssl/buffer.h>
  64 #include <openssl/objects.h>
  65 #include <openssl/evp.h>
  66
  67 static SSL_METHOD *ssl2_get_client_method(int ver);
  68 static int get_server_finished(SSL *s);
  69 static int get_server_verify(SSL *s);
  70 static int get_server_hello(SSL *s);
  71 static int client_hello(SSL *s);
  72 static int client_master_key(SSL *s);
  73 static int client_finished(SSL *s);
  74 static int client_certificate(SSL *s);
  75 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
  76         unsigned char *to,int padding);
  77 #define BREAK   break
  78
  79 static SSL_METHOD *ssl2_get_client_method(int ver)
  80         {
  81         if (ver == SSL2_VERSION)
  82                 return(SSLv2_client_method());
  83         else
  84                 return(NULL);
  85         }
  86
  87 SSL_METHOD *SSLv2_client_method(void)
  88         {
  89         static int init=1;
  90         static SSL_METHOD SSLv2_client_data;
  91
  92         if (init)
  93                 {
  94                 memcpy((char *)&SSLv2_client_data,(char *)sslv2_base_method(),
  95                         sizeof(SSL_METHOD));
  96                 SSLv2_client_data.ssl_connect=ssl2_connect;
  97                 SSLv2_client_data.get_ssl_method=ssl2_get_client_method;
  98                 init=0;
  99                 }
 100         return(&SSLv2_client_data);
 101         }
 102
 103 int ssl2_connect(SSL *s)
 104         {
 105         unsigned long l=time(NULL);
 106         BUF_MEM *buf=NULL;
 107         int ret= -1;
 108         void (*cb)()=NULL;
 109         int new_state,state;
 110
 111         RAND_add(&l,sizeof(l),0);
 112         ERR_clear_error();
 113         clear_sys_error();
 114
 115         if (s->info_callback != NULL)
 116                 cb=s->info_callback;
 117         else if (s->ctx->info_callback != NULL)
 118                 cb=s->ctx->info_callback;
 119
 120         /* init things to blank */
 121         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 122         s->in_handshake++;
 123
 124         for (;;)
 125                 {
 126                 state=s->state;
 127
 128                 switch (s->state)
 129                         {
 130                 case SSL_ST_BEFORE:
 131                 case SSL_ST_CONNECT:
 132                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 133                 case SSL_ST_OK|SSL_ST_CONNECT:
 134
 135                         s->server=0;
 136                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 137
 138                         s->version=SSL2_VERSION;
 139                         s->type=SSL_ST_CONNECT;
 140
 141                         buf=s->init_buf;
 142                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
 143                                 {
 144                                 ret= -1;
 145                                 goto end;
 146                                 }
 147                         if (!BUF_MEM_grow(buf,
 148                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 149                                 {
 150                                 ret= -1;
 151                                 goto end;
 152                                 }
 153                         s->init_buf=buf;
 154                         s->init_num=0;
 155                         s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
 156                         s->ctx->stats.sess_connect++;
 157                         s->handshake_func=ssl2_connect;
 158                         BREAK;
 159
 160                 case SSL2_ST_SEND_CLIENT_HELLO_A:
 161                 case SSL2_ST_SEND_CLIENT_HELLO_B:
 162                         s->shutdown=0;
 163                         ret=client_hello(s);
 164                         if (ret <= 0) goto end;
 165                         s->init_num=0;
 166                         s->state=SSL2_ST_GET_SERVER_HELLO_A;
 167                         BREAK;
 168
 169                 case SSL2_ST_GET_SERVER_HELLO_A:
 170                 case SSL2_ST_GET_SERVER_HELLO_B:
 171                         ret=get_server_hello(s);
 172                         if (ret <= 0) goto end;
 173                         s->init_num=0;
 174                         if (!s->hit) /* new session */
 175                                 {
 176                                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
 177                                 BREAK;
 178                                 }
 179                         else
 180                                 {
 181                                 s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
 182                                 break;
 183                                 }
 184
 185                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
 186                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
 187                         ret=client_master_key(s);
 188                         if (ret <= 0) goto end;
 189                         s->init_num=0;
 190                         s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
 191                         break;
 192
 193                 case SSL2_ST_CLIENT_START_ENCRYPTION:
 194                         /* Ok, we now have all the stuff needed to
 195                          * start encrypting, so lets fire it up :-) */
 196                         if (!ssl2_enc_init(s,1))
 197                                 {
 198                                 ret= -1;
 199                                 goto end;
 200                                 }
 201                         s->s2->clear_text=0;
 202                         s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
 203                         break;
 204
 205                 case SSL2_ST_SEND_CLIENT_FINISHED_A:
 206                 case SSL2_ST_SEND_CLIENT_FINISHED_B:
 207                         ret=client_finished(s);
 208                         if (ret <= 0) goto end;
 209                         s->init_num=0;
 210                         s->state=SSL2_ST_GET_SERVER_VERIFY_A;
 211                         break;
 212
 213                 case SSL2_ST_GET_SERVER_VERIFY_A:
 214                 case SSL2_ST_GET_SERVER_VERIFY_B:
 215                         ret=get_server_verify(s);
 216                         if (ret <= 0) goto end;
 217                         s->init_num=0;
 218                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
 219                         break;
 220
 221                 case SSL2_ST_GET_SERVER_FINISHED_A:
 222                 case SSL2_ST_GET_SERVER_FINISHED_B:
 223                         ret=get_server_finished(s);
 224                         if (ret <= 0) goto end;
 225                         break;
 226
 227                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
 228                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
 229                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
 230                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
 231                 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
 232                         ret=client_certificate(s);
 233                         if (ret <= 0) goto end;
 234                         s->init_num=0;
 235                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
 236                         break;
 237
 238                 case SSL_ST_OK:
 239                         if (s->init_buf != NULL)
 240                                 {
 241                                 BUF_MEM_free(s->init_buf);
 242                                 s->init_buf=NULL;
 243                                 }
 244                         s->init_num=0;
 245                 /*      ERR_clear_error();*/
 246
 247                         /* If we want to cache session-ids in the client
 248                          * and we successfully add the session-id to the
 249                          * cache, and there is a callback, then pass it out.
 250                          * 26/11/96 - eay - only add if not a re-used session.
 251                          */
 252
 253                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 254                         if (s->hit) s->ctx->stats.sess_hit++;
 255
 256                         ret=1;
 257                         /* s->server=0; */
 258                         s->ctx->stats.sess_connect_good++;
 259
 260                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 261
 262                         goto end;
 263                         /* break; */
 264                 default:
 265                         SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
 266                         return(-1);
 267                         /* break; */
 268                         }
 269
 270                 if ((cb != NULL) && (s->state != state))
 271                         {
 272                         new_state=s->state;
 273                         s->state=state;
 274                         cb(s,SSL_CB_CONNECT_LOOP,1);
 275                         s->state=new_state;
 276                         }
 277                 }
 278 end:
 279         s->in_handshake--;
 280         if (cb != NULL)
 281                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 282         return(ret);
 283         }
 284
 285 static int get_server_hello(SSL *s)
 286         {
 287         unsigned char *buf;
 288         unsigned char *p;
 289         int i,j;
 290         STACK_OF(SSL_CIPHER) *sk=NULL,*cl;
 291
 292         buf=(unsigned char *)s->init_buf->data;
 293         p=buf;
 294         if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
 295                 {
 296                 i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
 297                 if (i < (11-s->init_num))
 298                         return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
 299
 300                 if (*(p++) != SSL2_MT_SERVER_HELLO)
 301                         {
 302                         if (p[-1] != SSL2_MT_ERROR)
 303                                 {
 304                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 305                                 SSLerr(SSL_F_GET_SERVER_HELLO,
 306                                         SSL_R_READ_WRONG_PACKET_TYPE);
 307                                 }
 308                         else
 309                                 SSLerr(SSL_F_GET_SERVER_HELLO,
 310                                         SSL_R_PEER_ERROR);
 311                         return(-1);
 312                         }
 313 #ifdef __APPLE_CC__
 314                 /* The Rhapsody 5.5 (a.k.a. MacOS X) compiler bug
 315                  * workaround. <appro@fy.chalmers.se> */
 316                 s->hit=(i=*(p++))?1:0;
 317 #else
 318                 s->hit=(*(p++))?1:0;
 319 #endif
 320                 s->s2->tmp.cert_type= *(p++);
 321                 n2s(p,i);
 322                 if (i < s->version) s->version=i;
 323                 n2s(p,i); s->s2->tmp.cert_length=i;
 324                 n2s(p,i); s->s2->tmp.csl=i;
 325                 n2s(p,i); s->s2->tmp.conn_id_length=i;
 326                 s->state=SSL2_ST_GET_SERVER_HELLO_B;
 327                 s->init_num=0;
 328                 }
 329
 330         /* SSL2_ST_GET_SERVER_HELLO_B */
 331         j=s->s2->tmp.cert_length+s->s2->tmp.csl+s->s2->tmp.conn_id_length
 332                 - s->init_num;
 333         i=ssl2_read(s,(char *)&(buf[s->init_num]),j);
 334         if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
 335
 336         /* things are looking good */
 337
 338         p=buf;
 339         if (s->hit)
 340                 {
 341                 if (s->s2->tmp.cert_length != 0)
 342                         {
 343                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
 344                         return(-1);
 345                         }
 346                 if (s->s2->tmp.cert_type != 0)
 347                         {
 348                         if (!(s->options &
 349                                 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
 350                                 {
 351                                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
 352                                 return(-1);
 353                                 }
 354                         }
 355                 if (s->s2->tmp.csl != 0)
 356                         {
 357                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
 358                         return(-1);
 359                         }
 360                 }
 361         else
 362                 {
 363 #ifdef undef
 364                 /* very bad */
 365                 memset(s->session->session_id,0,
 366                         SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
 367                 s->session->session_id_length=0;
 368                 */
 369 #endif
 370
 371                 /* we need to do this in case we were trying to reuse a
 372                  * client session but others are already reusing it.
 373                  * If this was a new 'blank' session ID, the session-id
 374                  * length will still be 0 */
 375                 if (s->session->session_id_length > 0)
 376                         {
 377                         if (!ssl_get_new_session(s,0))
 378                                 {
 379                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 380                                 return(-1);
 381                                 }
 382                         }
 383
 384                 if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
 385                         s->s2->tmp.cert_length,p) <= 0)
 386                         {
 387                         ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 388                         return(-1);
 389                         }
 390                 p+=s->s2->tmp.cert_length;
 391
 392                 if (s->s2->tmp.csl == 0)
 393                         {
 394                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 395                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
 396                         return(-1);
 397                         }
 398
 399                 /* We have just received a list of ciphers back from the
 400                  * server.  We need to get the ones that match, then select
 401                  * the one we want the most :-). */
 402
 403                 /* load the ciphers */
 404                 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
 405                                             &s->session->ciphers);
 406                 p+=s->s2->tmp.csl;
 407                 if (sk == NULL)
 408                         {
 409                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 410                         SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
 411                         return(-1);
 412                         }
 413
 414                 sk_SSL_CIPHER_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
 415
 416                 /* get the array of ciphers we will accept */
 417                 cl=ssl_get_ciphers_by_id(s);
 418
 419                 /* In theory we could have ciphers sent back that we
 420                  * don't want to use but that does not matter since we
 421                  * will check against the list we originally sent and
 422                  * for performance reasons we should not bother to match
 423                  * the two lists up just to check. */
 424                 for (i=0; i<sk_SSL_CIPHER_num(cl); i++)
 425                         {
 426                         if (sk_SSL_CIPHER_find(sk,
 427                                                sk_SSL_CIPHER_value(cl,i)) >= 0)
 428                                 break;
 429                         }
 430
 431                 if (i >= sk_SSL_CIPHER_num(cl))
 432                         {
 433                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 434                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
 435                         return(-1);
 436                         }
 437                 s->session->cipher=sk_SSL_CIPHER_value(cl,i);
 438
 439
 440                 if (s->session->peer != NULL) /* can't happen*/
 441                         {
 442                         ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
 443                         SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_INTERNAL_ERROR);
 444                         return(-1);
 445                         }
 446
 447                 s->session->peer = s->session->sess_cert->peer_key->x509;
 448                 /* peer_key->x509 has been set by ssl2_set_certificate. */
 449                 CRYPTO_add(&s->session->peer->references, 1, CRYPTO_LOCK_X509);
 450                 }
 451
 452         if (s->session->peer != s->session->sess_cert->peer_key->x509)
 453                 /* can't happen */
 454                 {
 455                 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
 456                 SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_INTERNAL_ERROR);
 457                 return(-1);
 458                 }
 459
 460         s->s2->conn_id_length=s->s2->tmp.conn_id_length;
 461         memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
 462         return(1);
 463         }
 464
 465 static int client_hello(SSL *s)
 466         {
 467         unsigned char *buf;
 468         unsigned char *p,*d;
 469 /*      CIPHER **cipher;*/
 470         int i,n,j;
 471
 472         buf=(unsigned char *)s->init_buf->data;
 473         if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
 474                 {
 475                 if ((s->session == NULL) ||
 476                         (s->session->ssl_version != s->version))
 477                         {
 478                         if (!ssl_get_new_session(s,0))
 479                                 {
 480                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 481                                 return(-1);
 482                                 }
 483                         }
 484                 /* else use the pre-loaded session */
 485
 486                 p=buf;                                  /* header */
 487                 d=p+9;                                  /* data section */
 488                 *(p++)=SSL2_MT_CLIENT_HELLO;            /* type */
 489                 s2n(SSL2_VERSION,p);                    /* version */
 490                 n=j=0;
 491
 492                 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d);
 493                 d+=n;
 494
 495                 if (n == 0)
 496                         {
 497                         SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 498                         return(-1);
 499                         }
 500
 501                 s2n(n,p);                       /* cipher spec num bytes */
 502
 503                 if ((s->session->session_id_length > 0) &&
 504                         (s->session->session_id_length <=
 505                         SSL2_MAX_SSL_SESSION_ID_LENGTH))
 506                         {
 507                         i=s->session->session_id_length;
 508                         s2n(i,p);               /* session id length */
 509                         memcpy(d,s->session->session_id,(unsigned int)i);
 510                         d+=i;
 511                         }
 512                 else
 513                         {
 514                         s2n(0,p);
 515                         }
 516
 517                 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
 518                 s2n(SSL2_CHALLENGE_LENGTH,p);           /* challenge length */
 519                 /*challenge id data*/
 520                 RAND_pseudo_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 521                 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 522                 d+=SSL2_CHALLENGE_LENGTH;
 523
 524                 s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
 525                 s->init_num=d-buf;
 526                 s->init_off=0;
 527                 }
 528         /* SSL2_ST_SEND_CLIENT_HELLO_B */
 529         return(ssl2_do_write(s));
 530         }
 531
 532 static int client_master_key(SSL *s)
 533         {
 534         unsigned char *buf;
 535         unsigned char *p,*d;
 536         int clear,enc,karg,i;
 537         SSL_SESSION *sess;
 538         const EVP_CIPHER *c;
 539         const EVP_MD *md;
 540
 541         buf=(unsigned char *)s->init_buf->data;
 542         if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
 543                 {
 544
 545                 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
 546                         {
 547                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 548                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 549                         return(-1);
 550                         }
 551                 sess=s->session;
 552                 p=buf;
 553                 d=p+10;
 554                 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
 555
 556                 i=ssl_put_cipher_by_char(s,sess->cipher,p);
 557                 p+=i;
 558
 559                 /* make key_arg data */
 560                 i=EVP_CIPHER_iv_length(c);
 561                 sess->key_arg_length=i;
 562                 if (i > 0) RAND_pseudo_bytes(sess->key_arg,i);
 563
 564                 /* make a master key */
 565                 i=EVP_CIPHER_key_length(c);
 566                 sess->master_key_length=i;
 567                 if (i > 0)
 568                         {
 569                         if (RAND_bytes(sess->master_key,i) <= 0)
 570                                 {
 571                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 572                                 return(-1);
 573                                 }
 574                         }
 575
 576                 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 577                         enc=8;
 578                 else if (SSL_C_IS_EXPORT(sess->cipher))
 579                         enc=5;
 580                 else
 581                         enc=i;
 582
 583                 if (i < enc)
 584                         {
 585                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 586                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
 587                         return(-1);
 588                         }
 589                 clear=i-enc;
 590                 s2n(clear,p);
 591                 memcpy(d,sess->master_key,(unsigned int)clear);
 592                 d+=clear;
 593
 594                 enc=ssl_rsa_public_encrypt(sess->sess_cert,enc,
 595                         &(sess->master_key[clear]),d,
 596                         (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
 597                 if (enc <= 0)
 598                         {
 599                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 600                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
 601                         return(-1);
 602                         }
 603 #ifdef PKCS1_CHECK
 604                 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
 605                 if (s->options & SSL_OP_PKCS1_CHECK_2)
 606                         sess->master_key[clear]++;
 607 #endif
 608                 s2n(enc,p);
 609                 d+=enc;
 610                 karg=sess->key_arg_length;
 611                 s2n(karg,p); /* key arg size */
 612                 memcpy(d,sess->key_arg,(unsigned int)karg);
 613                 d+=karg;
 614
 615                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
 616                 s->init_num=d-buf;
 617                 s->init_off=0;
 618                 }
 619
 620         /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
 621         return(ssl2_do_write(s));
 622         }
 623
 624 static int client_finished(SSL *s)
 625         {
 626         unsigned char *p;
 627
 628         if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
 629                 {
 630                 p=(unsigned char *)s->init_buf->data;
 631                 *(p++)=SSL2_MT_CLIENT_FINISHED;
 632                 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
 633
 634                 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
 635                 s->init_num=s->s2->conn_id_length+1;
 636                 s->init_off=0;
 637                 }
 638         return(ssl2_do_write(s));
 639         }
 640
 641 /* read the data and then respond */
 642 static int client_certificate(SSL *s)
 643         {
 644         unsigned char *buf;
 645         unsigned char *p,*d;
 646         int i;
 647         unsigned int n;
 648         int cert_ch_len=0;
 649         unsigned char *cert_ch;
 650
 651         buf=(unsigned char *)s->init_buf->data;
 652         cert_ch= &(buf[2]);
 653
 654         /* We have a cert associated with the SSL, so attach it to
 655          * the session if it does not have one */
 656
 657         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
 658                 {
 659                 i=ssl2_read(s,(char *)&(buf[s->init_num]),
 660                         SSL2_MAX_CERT_CHALLENGE_LENGTH+1-s->init_num);
 661                 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+1-s->init_num))
 662                         return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
 663
 664                 /* type=buf[0]; */
 665                 /* type eq x509 */
 666                 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 667                         {
 668                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 669                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
 670                         return(-1);
 671                         }
 672                 cert_ch_len=i-1;
 673
 674                 if ((s->cert == NULL) ||
 675                         (s->cert->key->x509 == NULL) ||
 676                         (s->cert->key->privatekey == NULL))
 677                         {
 678                         s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
 679                         }
 680                 else
 681                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 682                 }
 683
 684         if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
 685                 {
 686                 X509 *x509=NULL;
 687                 EVP_PKEY *pkey=NULL;
 688
 689                 /* If we get an error we need to
 690                  * ssl->rwstate=SSL_X509_LOOKUP;
 691                  * return(error);
 692                  * We should then be retried when things are ok and we
 693                  * can get a cert or not */
 694
 695                 i=0;
 696                 if (s->ctx->client_cert_cb != NULL)
 697                         {
 698                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
 699                         }
 700
 701                 if (i < 0)
 702                         {
 703                         s->rwstate=SSL_X509_LOOKUP;
 704                         return(-1);
 705                         }
 706                 s->rwstate=SSL_NOTHING;
 707
 708                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
 709                         {
 710                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 711                         if (    !SSL_use_certificate(s,x509) ||
 712                                 !SSL_use_PrivateKey(s,pkey))
 713                                 {
 714                                 i=0;
 715                                 }
 716                         X509_free(x509);
 717                         EVP_PKEY_free(pkey);
 718                         }
 719                 else if (i == 1)
 720                         {
 721                         if (x509 != NULL) X509_free(x509);
 722                         if (pkey != NULL) EVP_PKEY_free(pkey);
 723                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
 724                         i=0;
 725                         }
 726
 727                 if (i == 0)
 728                         {
 729                         /* We have no client certificate to respond with
 730                          * so send the correct error message back */
 731                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
 732                         p=buf;
 733                         *(p++)=SSL2_MT_ERROR;
 734                         s2n(SSL2_PE_NO_CERTIFICATE,p);
 735                         s->init_off=0;
 736                         s->init_num=3;
 737                         /* Write is done at the end */
 738                         }
 739                 }
 740
 741         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
 742                 {
 743                 return(ssl2_do_write(s));
 744                 }
 745
 746         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
 747                 {
 748                 EVP_MD_CTX ctx;
 749
 750                 /* ok, now we calculate the checksum
 751                  * do it first so we can reuse buf :-) */
 752                 p=buf;
 753                 EVP_SignInit(&ctx,s->ctx->rsa_md5);
 754                 EVP_SignUpdate(&ctx,s->s2->key_material,
 755                         (unsigned int)s->s2->key_material_length);
 756                 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
 757                 n=i2d_X509(s->session->sess_cert->peer_key->x509,&p);
 758                 EVP_SignUpdate(&ctx,buf,(unsigned int)n);
 759
 760                 p=buf;
 761                 d=p+6;
 762                 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
 763                 *(p++)=SSL2_CT_X509_CERTIFICATE;
 764                 n=i2d_X509(s->cert->key->x509,&d);
 765                 s2n(n,p);
 766
 767                 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
 768                         {
 769                         /* this is not good.  If things have failed it
 770                          * means there so something wrong with the key.
 771                          * We will continue with a 0 length signature
 772                          */
 773                         }
 774                 memset(&ctx,0,sizeof(ctx));
 775                 s2n(n,p);
 776                 d+=n;
 777
 778                 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
 779                 s->init_num=d-buf;
 780                 s->init_off=0;
 781                 }
 782         /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
 783         return(ssl2_do_write(s));
 784         }
 785
 786 static int get_server_verify(SSL *s)
 787         {
 788         unsigned char *p;
 789         int i;
 790
 791         p=(unsigned char *)s->init_buf->data;
 792         if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
 793                 {
 794                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 795                 if (i < (1-s->init_num))
 796                         return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 797
 798                 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
 799                 s->init_num=0;
 800                 if (*p != SSL2_MT_SERVER_VERIFY)
 801                         {
 802                         if (p[0] != SSL2_MT_ERROR)
 803                                 {
 804                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 805                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 806                                         SSL_R_READ_WRONG_PACKET_TYPE);
 807                                 }
 808                         else
 809                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 810                                         SSL_R_PEER_ERROR);
 811                         return(-1);
 812                         }
 813                 }
 814
 815         p=(unsigned char *)s->init_buf->data;
 816         i=ssl2_read(s,(char *)&(p[s->init_num]),
 817                 (unsigned int)s->s2->challenge_length-s->init_num);
 818         if (i < ((int)s->s2->challenge_length-s->init_num))
 819                 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 820         if (memcmp(p,s->s2->challenge,(unsigned int)s->s2->challenge_length) != 0)
 821                 {
 822                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 823                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
 824                 return(-1);
 825                 }
 826         return(1);
 827         }
 828
 829 static int get_server_finished(SSL *s)
 830         {
 831         unsigned char *buf;
 832         unsigned char *p;
 833         int i;
 834
 835         buf=(unsigned char *)s->init_buf->data;
 836         p=buf;
 837         if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
 838                 {
 839                 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
 840                 if (i < (1-s->init_num))
 841                         return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 842                 s->init_num=i;
 843                 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
 844                         {
 845                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
 846                         return(1);
 847                         }
 848                 else if (*p != SSL2_MT_SERVER_FINISHED)
 849                         {
 850                         if (p[0] != SSL2_MT_ERROR)
 851                                 {
 852                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 853                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 854                                 }
 855                         else
 856                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
 857                         return(-1);
 858                         }
 859                 s->state=SSL_ST_OK;
 860                 s->init_num=0;
 861                 }
 862
 863         i=ssl2_read(s,(char *)&(buf[s->init_num]),
 864                 SSL2_SSL_SESSION_ID_LENGTH-s->init_num);
 865         if (i < (SSL2_SSL_SESSION_ID_LENGTH-s->init_num))
 866                 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 867
 868         if (!s->hit) /* new session */
 869                 {
 870                 /* new session-id */
 871                 /* Make sure we were not trying to re-use an old SSL_SESSION
 872                  * or bad things can happen */
 873                 /* ZZZZZZZZZZZZZ */
 874                 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
 875                 memcpy(s->session->session_id,p,SSL2_SSL_SESSION_ID_LENGTH);
 876                 }
 877         else
 878                 {
 879                 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
 880                         {
 881                         if (memcmp(buf,s->session->session_id,
 882                                 (unsigned int)s->session->session_id_length) != 0)
 883                                 {
 884                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 885                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
 886                                 return(-1);
 887                                 }
 888                         }
 889                 }
 890         return(1);
 891         }
 892
 893 /* loads in the certificate from the server */
 894 int ssl2_set_certificate(SSL *s, int type, int len, unsigned char *data)
 895         {
 896         STACK_OF(X509) *sk=NULL;
 897         EVP_PKEY *pkey=NULL;
 898         SESS_CERT *sc=NULL;
 899         int i;
 900         X509 *x509=NULL;
 901         int ret=0;
 902
 903         x509=d2i_X509(NULL,&data,(long)len);
 904         if (x509 == NULL)
 905                 {
 906                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
 907                 goto err;
 908                 }
 909
 910         if ((sk=sk_X509_new_null()) == NULL || !sk_X509_push(sk,x509))
 911                 {
 912                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 913                 goto err;
 914                 }
 915
 916         i=ssl_verify_cert_chain(s,sk);
 917
 918         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
 919                 {
 920                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 921                 goto err;
 922                 }
 923
 924         /* server's cert for this session */
 925         sc=ssl_sess_cert_new();
 926         if (sc == NULL)
 927                 {
 928                 ret= -1;
 929                 goto err;
 930                 }
 931         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 932         s->session->sess_cert=sc;
 933
 934         sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509=x509;
 935         sc->peer_key= &(sc->peer_pkeys[SSL_PKEY_RSA_ENC]);
 936
 937         pkey=X509_get_pubkey(x509);
 938         x509=NULL;
 939         if (pkey == NULL)
 940                 {
 941                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
 942                 goto err;
 943                 }
 944         if (pkey->type != EVP_PKEY_RSA)
 945                 {
 946                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
 947                 goto err;
 948                 }
 949
 950         if (!ssl_set_peer_cert_type(sc,SSL2_CT_X509_CERTIFICATE))
 951                 goto err;
 952         ret=1;
 953 err:
 954         sk_X509_free(sk);
 955         X509_free(x509);
 956         EVP_PKEY_free(pkey);
 957         return(ret);
 958         }
 959
 960 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
 961              unsigned char *to, int padding)
 962         {
 963         EVP_PKEY *pkey=NULL;
 964         int i= -1;
 965
 966         if ((sc == NULL) || (sc->peer_key->x509 == NULL) ||
 967                 ((pkey=X509_get_pubkey(sc->peer_key->x509)) == NULL))
 968                 {
 969                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
 970                 return(-1);
 971                 }
 972         if (pkey->type != EVP_PKEY_RSA)
 973                 {
 974                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
 975                 goto end;
 976                 }
 977
 978         /* we have the public key */
 979         i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
 980         if (i < 0)
 981                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
 982 end:
 983         EVP_PKEY_free(pkey);
 984         return(i);
 985         }
 986 #else /* !NO_SSL2 */
 987
 988 # if PEDANTIC
 989 static void *dummy=&dummy;
 990 # endif
 991
 992 #endif