ssl/s3_both.c

   1 /* ssl/s3_both.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 <string.h>
  60 #include <stdio.h>
  61 #include <openssl/buffer.h>
  62 #include <openssl/rand.h>
  63 #include <openssl/objects.h>
  64 #include <openssl/evp.h>
  65 #include <openssl/x509.h>
  66 #include "ssl_locl.h"
  67
  68 /* send s->init_buf in records of type 'type' */
  69 int ssl3_do_write(SSL *s, int type)
  70         {
  71         int ret;
  72
  73         ret=ssl3_write_bytes(s,type,&s->init_buf->data[s->init_off],
  74                              s->init_num);
  75         if (ret < 0) return(-1);
  76         if (type == SSL3_RT_HANDSHAKE)
  77                 /* should not be done for 'Hello Request's, but in that case
  78                  * we'll ignore the result anyway */
  79                 ssl3_finish_mac(s,(unsigned char *)&s->init_buf->data[s->init_off],ret);
  80
  81         if (ret == s->init_num)
  82                 return(1);
  83         s->init_off+=ret;
  84         s->init_num-=ret;
  85         return(0);
  86         }
  87
  88 int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
  89         {
  90         unsigned char *p,*d;
  91         int i;
  92         unsigned long l;
  93
  94         if (s->state == a)
  95                 {
  96                 d=(unsigned char *)s->init_buf->data;
  97                 p= &(d[4]);
  98
  99                 i=s->method->ssl3_enc->final_finish_mac(s,
 100                         &(s->s3->finish_dgst1),
 101                         &(s->s3->finish_dgst2),
 102                         sender,slen,s->s3->tmp.finish_md);
 103                 s->s3->tmp.finish_md_len = i;
 104                 memcpy(p, s->s3->tmp.finish_md, i);
 105                 p+=i;
 106                 l=i;
 107
 108 #ifdef WIN16
 109                 /* MSVC 1.5 does not clear the top bytes of the word unless
 110                  * I do this.
 111                  */
 112                 l&=0xffff;
 113 #endif
 114
 115                 *(d++)=SSL3_MT_FINISHED;
 116                 l2n3(l,d);
 117                 s->init_num=(int)l+4;
 118                 s->init_off=0;
 119
 120                 s->state=b;
 121                 }
 122
 123         /* SSL3_ST_SEND_xxxxxx_HELLO_B */
 124         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 125         }
 126
 127 int ssl3_get_finished(SSL *s, int a, int b)
 128         {
 129         int al,i,ok;
 130         long n;
 131         unsigned char *p;
 132
 133         /* the mac has already been generated when we received the
 134          * change cipher spec message and is in s->s3->tmp.peer_finish_md
 135          */
 136
 137         n=ssl3_get_message(s,
 138                 a,
 139                 b,
 140                 SSL3_MT_FINISHED,
 141                 64, /* should actually be 36+4 :-) */
 142                 &ok);
 143
 144         if (!ok) return((int)n);
 145
 146         /* If this occurs, we have missed a message */
 147         if (!s->s3->change_cipher_spec)
 148                 {
 149                 al=SSL_AD_UNEXPECTED_MESSAGE;
 150                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_GOT_A_FIN_BEFORE_A_CCS);
 151                 goto f_err;
 152                 }
 153         s->s3->change_cipher_spec=0;
 154
 155         p = (unsigned char *)s->init_buf->data;
 156         i = s->s3->tmp.peer_finish_md_len;
 157
 158         if (i != n)
 159                 {
 160                 al=SSL_AD_DECODE_ERROR;
 161                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_BAD_DIGEST_LENGTH);
 162                 goto f_err;
 163                 }
 164
 165         if (memcmp(p, s->s3->tmp.peer_finish_md, i) != 0)
 166                 {
 167                 al=SSL_AD_DECRYPT_ERROR;
 168                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);
 169                 goto f_err;
 170                 }
 171
 172         return(1);
 173 f_err:
 174         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 175         return(0);
 176         }
 177
 178 /* for these 2 messages, we need to
 179  * ssl->enc_read_ctx                    re-init
 180  * ssl->s3->read_sequence               zero
 181  * ssl->s3->read_mac_secret             re-init
 182  * ssl->session->read_sym_enc           assign
 183  * ssl->session->read_compression       assign
 184  * ssl->session->read_hash              assign
 185  */
 186 int ssl3_send_change_cipher_spec(SSL *s, int a, int b)
 187         {
 188         unsigned char *p;
 189
 190         if (s->state == a)
 191                 {
 192                 p=(unsigned char *)s->init_buf->data;
 193                 *p=SSL3_MT_CCS;
 194                 s->init_num=1;
 195                 s->init_off=0;
 196
 197                 s->state=b;
 198                 }
 199
 200         /* SSL3_ST_CW_CHANGE_B */
 201         return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
 202         }
 203
 204 unsigned long ssl3_output_cert_chain(SSL *s, X509 *x)
 205         {
 206         unsigned char *p;
 207         int n,i;
 208         unsigned long l=7;
 209         BUF_MEM *buf;
 210         X509_STORE_CTX xs_ctx;
 211         X509_OBJECT obj;
 212
 213         /* TLSv1 sends a chain with nothing in it, instead of an alert */
 214         buf=s->init_buf;
 215         if (!BUF_MEM_grow(buf,(int)(10)))
 216                 {
 217                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 218                 return(0);
 219                 }
 220         if (x != NULL)
 221                 {
 222                 X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL);
 223
 224                 for (;;)
 225                         {
 226                         n=i2d_X509(x,NULL);
 227                         if (!BUF_MEM_grow(buf,(int)(n+l+3)))
 228                                 {
 229                                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 230                                 return(0);
 231                                 }
 232                         p=(unsigned char *)&(buf->data[l]);
 233                         l2n3(n,p);
 234                         i2d_X509(x,&p);
 235                         l+=n+3;
 236                         if (X509_NAME_cmp(X509_get_subject_name(x),
 237                                 X509_get_issuer_name(x)) == 0) break;
 238
 239                         i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509,
 240                                 X509_get_issuer_name(x),&obj);
 241                         if (i <= 0) break;
 242                         x=obj.data.x509;
 243                         /* Count is one too high since the X509_STORE_get uped the
 244                          * ref count */
 245                         X509_free(x);
 246                         }
 247
 248                 X509_STORE_CTX_cleanup(&xs_ctx);
 249                 }
 250
 251         /* Thawte special :-) */
 252         if (s->ctx->extra_certs != NULL)
 253         for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
 254                 {
 255                 x=sk_X509_value(s->ctx->extra_certs,i);
 256                 n=i2d_X509(x,NULL);
 257                 if (!BUF_MEM_grow(buf,(int)(n+l+3)))
 258                         {
 259                         SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 260                         return(0);
 261                         }
 262                 p=(unsigned char *)&(buf->data[l]);
 263                 l2n3(n,p);
 264                 i2d_X509(x,&p);
 265                 l+=n+3;
 266                 }
 267
 268         l-=7;
 269         p=(unsigned char *)&(buf->data[4]);
 270         l2n3(l,p);
 271         l+=3;
 272         p=(unsigned char *)&(buf->data[0]);
 273         *(p++)=SSL3_MT_CERTIFICATE;
 274         l2n3(l,p);
 275         l+=4;
 276         return(l);
 277         }
 278
 279 /* Obtain handshake message of message type 'mt' (any if mt == -1),
 280  * maximum acceptable body length 'max'.
 281  * The first four bytes (msg_type and length) are read in state 'st1',
 282  * the body is read in state 'stn'.
 283  */
 284 long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
 285         {
 286         unsigned char *p;
 287         unsigned long l;
 288         long n;
 289         int i,al;
 290
 291         if (s->s3->tmp.reuse_message)
 292                 {
 293                 s->s3->tmp.reuse_message=0;
 294                 if ((mt >= 0) && (s->s3->tmp.message_type != mt))
 295                         {
 296                         al=SSL_AD_UNEXPECTED_MESSAGE;
 297                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 298                         goto f_err;
 299                         }
 300                 *ok=1;
 301                 return((int)s->s3->tmp.message_size);
 302                 }
 303
 304         p=(unsigned char *)s->init_buf->data;
 305
 306         if (s->state == st1) /* s->init_num < 4 */
 307                 {
 308                 int skip_message;
 309
 310                 do
 311                         {
 312                         while (s->init_num < 4)
 313                                 {
 314                                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],
 315                                         4 - s->init_num);
 316                                 if (i <= 0)
 317                                         {
 318                                         s->rwstate=SSL_READING;
 319                                         *ok = 0;
 320                                         return i;
 321                                         }
 322                                 s->init_num+=i;
 323                                 }
 324
 325                         skip_message = 0;
 326                         if (!s->server)
 327                                 if (p[0] == SSL3_MT_HELLO_REQUEST)
 328                                         /* The server may always send 'Hello Request' messages --
 329                                          * we are doing a handshake anyway now, so ignore them
 330                                          * if their format is correct. Does not count for
 331                                          * 'Finished' MAC. */
 332                                         if (p[1] == 0 && p[2] == 0 &&p[3] == 0)
 333                                                 skip_message = 1;
 334                         }
 335                 while (skip_message);
 336
 337                 /* s->init_num == 4 */
 338
 339                 if ((mt >= 0) && (*p != mt))
 340                         {
 341                         al=SSL_AD_UNEXPECTED_MESSAGE;
 342                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 343                         goto f_err;
 344                         }
 345                 if ((mt < 0) && (*p == SSL3_MT_CLIENT_HELLO) &&
 346                                         (st1 == SSL3_ST_SR_CERT_A) &&
 347                                         (stn == SSL3_ST_SR_CERT_B))
 348                         {
 349                         /* At this point we have got an MS SGC second client
 350                          * hello (maybe we should always allow the client to
 351                          * start a new handshake?). We need to restart the mac.
 352                          * Don't increment {num,total}_renegotiations because
 353                          * we have not completed the handshake. */
 354                         ssl3_init_finished_mac(s);
 355                         }
 356
 357                 ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, 4);
 358
 359                 s->s3->tmp.message_type= *(p++);
 360
 361                 n2l3(p,l);
 362                 if (l > (unsigned long)max)
 363                         {
 364                         al=SSL_AD_ILLEGAL_PARAMETER;
 365                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
 366                         goto f_err;
 367                         }
 368                 if (l && !BUF_MEM_grow(s->init_buf,(int)l))
 369                         {
 370                         SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
 371                         goto err;
 372                         }
 373                 s->s3->tmp.message_size=l;
 374                 s->state=stn;
 375
 376                 s->init_num=0;
 377                 }
 378
 379         /* next state (stn) */
 380         p=(unsigned char *)s->init_buf->data;
 381         n=s->s3->tmp.message_size;
 382         while (n > 0)
 383                 {
 384                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],n);
 385                 if (i <= 0)
 386                         {
 387                         s->rwstate=SSL_READING;
 388                         *ok = 0;
 389                         return i;
 390                         }
 391                 s->init_num += i;
 392                 n -= i;
 393                 }
 394         ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num);
 395         *ok=1;
 396         return s->init_num;
 397 f_err:
 398         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 399 err:
 400         *ok=0;
 401         return(-1);
 402         }
 403
 404 int ssl_cert_type(X509 *x, EVP_PKEY *pkey)
 405         {
 406         EVP_PKEY *pk;
 407         int ret= -1,i,j;
 408
 409         if (pkey == NULL)
 410                 pk=X509_get_pubkey(x);
 411         else
 412                 pk=pkey;
 413         if (pk == NULL) goto err;
 414
 415         i=pk->type;
 416         if (i == EVP_PKEY_RSA)
 417                 {
 418                 ret=SSL_PKEY_RSA_ENC;
 419                 if (x != NULL)
 420                         {
 421                         j=X509_get_ext_count(x);
 422                         /* check to see if this is a signing only certificate */
 423                         /* EAY EAY EAY EAY */
 424                         }
 425                 }
 426         else if (i == EVP_PKEY_DSA)
 427                 {
 428                 ret=SSL_PKEY_DSA_SIGN;
 429                 }
 430         else if (i == EVP_PKEY_DH)
 431                 {
 432                 /* if we just have a key, we needs to be guess */
 433
 434                 if (x == NULL)
 435                         ret=SSL_PKEY_DH_DSA;
 436                 else
 437                         {
 438                         j=X509_get_signature_type(x);
 439                         if (j == EVP_PKEY_RSA)
 440                                 ret=SSL_PKEY_DH_RSA;
 441                         else if (j== EVP_PKEY_DSA)
 442                                 ret=SSL_PKEY_DH_DSA;
 443                         else ret= -1;
 444                         }
 445                 }
 446         else
 447                 ret= -1;
 448
 449 err:
 450         if(!pkey) EVP_PKEY_free(pk);
 451         return(ret);
 452         }
 453
 454 int ssl_verify_alarm_type(long type)
 455         {
 456         int al;
 457
 458         switch(type)
 459                 {
 460         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
 461         case X509_V_ERR_UNABLE_TO_GET_CRL:
 462                 al=SSL_AD_UNKNOWN_CA;
 463                 break;
 464         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
 465         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
 466         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
 467         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
 468         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
 469         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
 470         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
 471         case X509_V_ERR_CERT_NOT_YET_VALID:
 472         case X509_V_ERR_CRL_NOT_YET_VALID:
 473                 al=SSL_AD_BAD_CERTIFICATE;
 474                 break;
 475         case X509_V_ERR_CERT_SIGNATURE_FAILURE:
 476         case X509_V_ERR_CRL_SIGNATURE_FAILURE:
 477                 al=SSL_AD_DECRYPT_ERROR;
 478                 break;
 479         case X509_V_ERR_CERT_HAS_EXPIRED:
 480         case X509_V_ERR_CRL_HAS_EXPIRED:
 481                 al=SSL_AD_CERTIFICATE_EXPIRED;
 482                 break;
 483         case X509_V_ERR_CERT_REVOKED:
 484                 al=SSL_AD_CERTIFICATE_REVOKED;
 485                 break;
 486         case X509_V_ERR_OUT_OF_MEM:
 487                 al=SSL_AD_INTERNAL_ERROR;
 488                 break;
 489         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
 490         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
 491         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
 492         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
 493         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
 494                 al=SSL_AD_UNKNOWN_CA;
 495                 break;
 496         case X509_V_ERR_APPLICATION_VERIFICATION:
 497                 al=SSL_AD_HANDSHAKE_FAILURE;
 498                 break;
 499         default:
 500                 al=SSL_AD_CERTIFICATE_UNKNOWN;
 501                 break;
 502                 }
 503         return(al);
 504         }
 505
 506 int ssl3_setup_buffers(SSL *s)
 507         {
 508         unsigned char *p;
 509         unsigned int extra;
 510
 511         if (s->s3->rbuf.buf == NULL)
 512                 {
 513                 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 514                         extra=SSL3_RT_MAX_EXTRA;
 515                 else
 516                         extra=0;
 517                 if ((p=Malloc(SSL3_RT_MAX_PACKET_SIZE+extra))
 518                         == NULL)
 519                         goto err;
 520                 s->s3->rbuf.buf=p;
 521                 }
 522
 523         if (s->s3->wbuf.buf == NULL)
 524                 {
 525                 if ((p=Malloc(SSL3_RT_MAX_PACKET_SIZE))
 526                         == NULL)
 527                         goto err;
 528                 s->s3->wbuf.buf=p;
 529                 }
 530         s->packet= &(s->s3->rbuf.buf[0]);
 531         return(1);
 532 err:
 533         SSLerr(SSL_F_SSL3_SETUP_BUFFERS,ERR_R_MALLOC_FAILURE);
 534         return(0);
 535         }