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         unsigned char *finish_md;
  74         int *finish_md_len;
  75
  76         if (s->state & SSL_ST_ACCEPT)
  77                 {
  78                 finish_md = s->s3->tmp.server_finish_md;
  79                 finish_md_len = &s->s3->tmp.server_finish_md_len;
  80                 }
  81         else
  82                 {
  83                 finish_md = s->s3->tmp.client_finish_md;
  84                 finish_md_len = &s->s3->tmp.client_finish_md_len;
  85                 }
  86
  87         if (s->state == a)
  88                 {
  89                 d=(unsigned char *)s->init_buf->data;
  90                 p= &(d[4]);
  91
  92                 i=s->method->ssl3_enc->final_finish_mac(s,
  93                         &(s->s3->finish_dgst1),
  94                         &(s->s3->finish_dgst2),
  95                         sender,slen,finish_md);
  96                 *finish_md_len = i;
  97                 memcpy(p, finish_md, i);
  98                 p+=i;
  99                 l=i;
 100
 101 #ifdef WIN16
 102                 /* MSVC 1.5 does not clear the top bytes of the word unless
 103                  * I do this.
 104                  */
 105                 l&=0xffff;
 106 #endif
 107
 108                 *(d++)=SSL3_MT_FINISHED;
 109                 l2n3(l,d);
 110                 s->init_num=(int)l+4;
 111                 s->init_off=0;
 112
 113                 s->state=b;
 114                 }
 115
 116         /* SSL3_ST_SEND_xxxxxx_HELLO_B */
 117         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 118         }
 119
 120 int ssl3_get_finished(SSL *s, int a, int b)
 121         {
 122         int al,i,ok;
 123         long n;
 124         unsigned char *p;
 125         unsigned char *finish_md;
 126         int *finish_md_len;
 127
 128         if (s->state & SSL_ST_ACCEPT)
 129                 {
 130                 finish_md = s->s3->tmp.client_finish_md;
 131                 finish_md_len = &s->s3->tmp.client_finish_md_len;
 132                 }
 133         else
 134                 {
 135                 finish_md = s->s3->tmp.server_finish_md;
 136                 finish_md_len = &s->s3->tmp.server_finish_md_len;
 137                 }
 138
 139         /* the mac has already been generated when we received the
 140          * change cipher spec message and is in finish_md
 141          */
 142
 143         n=ssl3_get_message(s,
 144                 a,
 145                 b,
 146                 SSL3_MT_FINISHED,
 147                 64, /* should actually be 36+4 :-) */
 148                 &ok);
 149
 150         if (!ok) return((int)n);
 151
 152         /* If this occurs if we has missed a message */
 153         if (!s->s3->change_cipher_spec)
 154                 {
 155                 al=SSL_AD_UNEXPECTED_MESSAGE;
 156                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_GOT_A_FIN_BEFORE_A_CCS);
 157                 goto f_err;
 158                 }
 159         s->s3->change_cipher_spec=0;
 160
 161         p=(unsigned char *)s->init_buf->data;
 162
 163         i=*finish_md_len;
 164
 165         if (i != n)
 166                 {
 167                 al=SSL_AD_DECODE_ERROR;
 168                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_BAD_DIGEST_LENGTH);
 169                 goto f_err;
 170                 }
 171
 172         if (memcmp(p, finish_md, i) != 0)
 173                 {
 174                 al=SSL_AD_DECRYPT_ERROR;
 175                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);
 176                 goto f_err;
 177                 }
 178
 179         return(1);
 180 f_err:
 181         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 182         return(0);
 183         }
 184
 185 /* for these 2 messages, we need to
 186  * ssl->enc_read_ctx                    re-init
 187  * ssl->s3->read_sequence               zero
 188  * ssl->s3->read_mac_secret             re-init
 189  * ssl->session->read_sym_enc           assign
 190  * ssl->session->read_compression       assign
 191  * ssl->session->read_hash              assign
 192  */
 193 int ssl3_send_change_cipher_spec(SSL *s, int a, int b)
 194         {
 195         unsigned char *p;
 196
 197         if (s->state == a)
 198                 {
 199                 p=(unsigned char *)s->init_buf->data;
 200                 *p=SSL3_MT_CCS;
 201                 s->init_num=1;
 202                 s->init_off=0;
 203
 204                 s->state=b;
 205                 }
 206
 207         /* SSL3_ST_CW_CHANGE_B */
 208         return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
 209         }
 210
 211 unsigned long ssl3_output_cert_chain(SSL *s, X509 *x)
 212         {
 213         unsigned char *p;
 214         int n,i;
 215         unsigned long l=7;
 216         BUF_MEM *buf;
 217         X509_STORE_CTX xs_ctx;
 218         X509_OBJECT obj;
 219
 220         /* TLSv1 sends a chain with nothing in it, instead of an alert */
 221         buf=s->init_buf;
 222         if (!BUF_MEM_grow(buf,(int)(10)))
 223                 {
 224                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 225                 return(0);
 226                 }
 227         if (x != NULL)
 228                 {
 229                 X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL);
 230
 231                 for (;;)
 232                         {
 233                         n=i2d_X509(x,NULL);
 234                         if (!BUF_MEM_grow(buf,(int)(n+l+3)))
 235                                 {
 236                                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 237                                 return(0);
 238                                 }
 239                         p=(unsigned char *)&(buf->data[l]);
 240                         l2n3(n,p);
 241                         i2d_X509(x,&p);
 242                         l+=n+3;
 243                         if (X509_NAME_cmp(X509_get_subject_name(x),
 244                                 X509_get_issuer_name(x)) == 0) break;
 245
 246                         i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509,
 247                                 X509_get_issuer_name(x),&obj);
 248                         if (i <= 0) break;
 249                         x=obj.data.x509;
 250                         /* Count is one too high since the X509_STORE_get uped the
 251                          * ref count */
 252                         X509_free(x);
 253                         }
 254
 255                 X509_STORE_CTX_cleanup(&xs_ctx);
 256                 }
 257
 258         /* Thawte special :-) */
 259         if (s->ctx->extra_certs != NULL)
 260         for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
 261                 {
 262                 x=sk_X509_value(s->ctx->extra_certs,i);
 263                 n=i2d_X509(x,NULL);
 264                 if (!BUF_MEM_grow(buf,(int)(n+l+3)))
 265                         {
 266                         SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 267                         return(0);
 268                         }
 269                 p=(unsigned char *)&(buf->data[l]);
 270                 l2n3(n,p);
 271                 i2d_X509(x,&p);
 272                 l+=n+3;
 273                 }
 274
 275         l-=7;
 276         p=(unsigned char *)&(buf->data[4]);
 277         l2n3(l,p);
 278         l+=3;
 279         p=(unsigned char *)&(buf->data[0]);
 280         *(p++)=SSL3_MT_CERTIFICATE;
 281         l2n3(l,p);
 282         l+=4;
 283         return(l);
 284         }
 285
 286 long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
 287         {
 288         unsigned char *p;
 289         unsigned long l;
 290         long n;
 291         int i,al;
 292
 293         if (s->s3->tmp.reuse_message)
 294                 {
 295                 s->s3->tmp.reuse_message=0;
 296                 if ((mt >= 0) && (s->s3->tmp.message_type != mt))
 297                         {
 298                         al=SSL_AD_UNEXPECTED_MESSAGE;
 299                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 300                         goto f_err;
 301                         }
 302                 *ok=1;
 303                 return((int)s->s3->tmp.message_size);
 304                 }
 305
 306         p=(unsigned char *)s->init_buf->data;
 307
 308         if (s->state == st1)
 309                 {
 310                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],
 311                                   4-s->init_num);
 312                 if (i < (4-s->init_num))
 313                         {
 314                         *ok=0;
 315                         return(ssl3_part_read(s,i));
 316                         }
 317
 318                 if ((mt >= 0) && (*p != mt))
 319                         {
 320                         al=SSL_AD_UNEXPECTED_MESSAGE;
 321                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 322                         goto f_err;
 323                         }
 324                 if((mt < 0) && (*p == SSL3_MT_CLIENT_HELLO) &&
 325                                         (st1 == SSL3_ST_SR_CERT_A) &&
 326                                         (stn == SSL3_ST_SR_CERT_B))
 327                         {
 328                         /* At this point we have got an MS SGC second client
 329                          * hello. We need to restart the mac and mac the data
 330                          * currently received.
 331                          */
 332                         ssl3_init_finished_mac(s);
 333                         ssl3_finish_mac(s, p + s->init_num, i);
 334                         }
 335
 336                 s->s3->tmp.message_type= *(p++);
 337
 338                 n2l3(p,l);
 339                 if (l > (unsigned long)max)
 340                         {
 341                         al=SSL_AD_ILLEGAL_PARAMETER;
 342                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
 343                         goto f_err;
 344                         }
 345                 if (l && !BUF_MEM_grow(s->init_buf,(int)l))
 346                         {
 347                         SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
 348                         goto err;
 349                         }
 350                 s->s3->tmp.message_size=l;
 351                 s->state=stn;
 352
 353                 s->init_num=0;
 354                 }
 355
 356         /* next state (stn) */
 357         p=(unsigned char *)s->init_buf->data;
 358         n=s->s3->tmp.message_size;
 359         if (n > 0)
 360                 {
 361                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],n);
 362                 if (i != (int)n)
 363                         {
 364                         *ok=0;
 365                         return(ssl3_part_read(s,i));
 366                         }
 367                 }
 368         *ok=1;
 369         return(n);
 370 f_err:
 371         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 372 err:
 373         *ok=0;
 374         return(-1);
 375         }
 376
 377 int ssl_cert_type(X509 *x, EVP_PKEY *pkey)
 378         {
 379         EVP_PKEY *pk;
 380         int ret= -1,i,j;
 381
 382         if (pkey == NULL)
 383                 pk=X509_get_pubkey(x);
 384         else
 385                 pk=pkey;
 386         if (pk == NULL) goto err;
 387
 388         i=pk->type;
 389         if (i == EVP_PKEY_RSA)
 390                 {
 391                 ret=SSL_PKEY_RSA_ENC;
 392                 if (x != NULL)
 393                         {
 394                         j=X509_get_ext_count(x);
 395                         /* check to see if this is a signing only certificate */
 396                         /* EAY EAY EAY EAY */
 397                         }
 398                 }
 399         else if (i == EVP_PKEY_DSA)
 400                 {
 401                 ret=SSL_PKEY_DSA_SIGN;
 402                 }
 403         else if (i == EVP_PKEY_DH)
 404                 {
 405                 /* if we just have a key, we needs to be guess */
 406
 407                 if (x == NULL)
 408                         ret=SSL_PKEY_DH_DSA;
 409                 else
 410                         {
 411                         j=X509_get_signature_type(x);
 412                         if (j == EVP_PKEY_RSA)
 413                                 ret=SSL_PKEY_DH_RSA;
 414                         else if (j== EVP_PKEY_DSA)
 415                                 ret=SSL_PKEY_DH_DSA;
 416                         else ret= -1;
 417                         }
 418                 }
 419         else
 420                 ret= -1;
 421
 422 err:
 423         if(!pkey) EVP_PKEY_free(pk);
 424         return(ret);
 425         }
 426
 427 int ssl_verify_alarm_type(long type)
 428         {
 429         int al;
 430
 431         switch(type)
 432                 {
 433         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
 434         case X509_V_ERR_UNABLE_TO_GET_CRL:
 435                 al=SSL_AD_UNKNOWN_CA;
 436                 break;
 437         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
 438         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
 439         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
 440         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
 441         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
 442         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
 443         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
 444         case X509_V_ERR_CERT_NOT_YET_VALID:
 445         case X509_V_ERR_CRL_NOT_YET_VALID:
 446                 al=SSL_AD_BAD_CERTIFICATE;
 447                 break;
 448         case X509_V_ERR_CERT_SIGNATURE_FAILURE:
 449         case X509_V_ERR_CRL_SIGNATURE_FAILURE:
 450                 al=SSL_AD_DECRYPT_ERROR;
 451                 break;
 452         case X509_V_ERR_CERT_HAS_EXPIRED:
 453         case X509_V_ERR_CRL_HAS_EXPIRED:
 454                 al=SSL_AD_CERTIFICATE_EXPIRED;
 455                 break;
 456         case X509_V_ERR_CERT_REVOKED:
 457                 al=SSL_AD_CERTIFICATE_REVOKED;
 458                 break;
 459         case X509_V_ERR_OUT_OF_MEM:
 460                 al=SSL_AD_INTERNAL_ERROR;
 461                 break;
 462         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
 463         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
 464         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
 465         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
 466         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
 467                 al=SSL_AD_UNKNOWN_CA;
 468                 break;
 469         case X509_V_ERR_APPLICATION_VERIFICATION:
 470                 al=SSL_AD_HANDSHAKE_FAILURE;
 471                 break;
 472         default:
 473                 al=SSL_AD_CERTIFICATE_UNKNOWN;
 474                 break;
 475                 }
 476         return(al);
 477         }
 478
 479 int ssl3_setup_buffers(SSL *s)
 480         {
 481         unsigned char *p;
 482         unsigned int extra;
 483
 484         if (s->s3->rbuf.buf == NULL)
 485                 {
 486                 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 487                         extra=SSL3_RT_MAX_EXTRA;
 488                 else
 489                         extra=0;
 490                 if ((p=(unsigned char *)Malloc(SSL3_RT_MAX_PACKET_SIZE+extra))
 491                         == NULL)
 492                         goto err;
 493                 s->s3->rbuf.buf=p;
 494                 }
 495
 496         if (s->s3->wbuf.buf == NULL)
 497                 {
 498                 if ((p=(unsigned char *)Malloc(SSL3_RT_MAX_PACKET_SIZE))
 499                         == NULL)
 500                         goto err;
 501                 s->s3->wbuf.buf=p;
 502                 }
 503         s->packet= &(s->s3->rbuf.buf[0]);
 504         return(1);
 505 err:
 506         SSLerr(SSL_F_SSL3_SETUP_BUFFERS,ERR_R_MALLOC_FAILURE);
 507         return(0);
 508         }