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