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 <stdio.h>
  60 #include <openssl/buffer.h>
  61 #include <openssl/rand.h>
  62 #include <openssl/objects.h>
  63 #include <openssl/evp.h>
  64 #include <openssl/x509.h>
  65 #include "ssl_locl.h"
  66
  67 int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
  68         {
  69         unsigned char *p,*d;
  70         int i;
  71         unsigned long l;
  72
  73         if (s->state == a)
  74                 {
  75                 d=(unsigned char *)s->init_buf->data;
  76                 p= &(d[4]);
  77
  78                 i=s->method->ssl3_enc->final_finish_mac(s,
  79                         &(s->s3->finish_dgst1),
  80                         &(s->s3->finish_dgst2),
  81                         sender,slen,p);
  82                 p+=i;
  83                 l=i;
  84
  85 #ifdef WIN16
  86                 /* MSVC 1.5 does not clear the top bytes of the word unless
  87                  * I do this.
  88                  */
  89                 l&=0xffff;
  90 #endif
  91
  92                 *(d++)=SSL3_MT_FINISHED;
  93                 l2n3(l,d);
  94                 s->init_num=(int)l+4;
  95                 s->init_off=0;
  96
  97                 s->state=b;
  98                 }
  99
 100         /* SSL3_ST_SEND_xxxxxx_HELLO_B */
 101         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 102         }
 103
 104 int ssl3_get_finished(SSL *s, int a, int b)
 105         {
 106         int al,i,ok;
 107         long n;
 108         unsigned char *p;
 109
 110         /* the mac has already been generated when we received the
 111          * change cipher spec message and is in s->s3->tmp.finish_md
 112          */
 113
 114         n=ssl3_get_message(s,
 115                 a,
 116                 b,
 117                 SSL3_MT_FINISHED,
 118                 64, /* should actually be 36+4 :-) */
 119                 &ok);
 120
 121         if (!ok) return((int)n);
 122
 123         /* If this occurs if we has missed a message */
 124         if (!s->s3->change_cipher_spec)
 125                 {
 126                 al=SSL_AD_UNEXPECTED_MESSAGE;
 127                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_GOT_A_FIN_BEFORE_A_CCS);
 128                 goto f_err;
 129                 }
 130         s->s3->change_cipher_spec=0;
 131
 132         p=(unsigned char *)s->init_buf->data;
 133
 134         i=s->method->ssl3_enc->finish_mac_length;
 135
 136         if (i != n)
 137                 {
 138                 al=SSL_AD_DECODE_ERROR;
 139                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_BAD_DIGEST_LENGTH);
 140                 goto f_err;
 141                 }
 142
 143         if (memcmp(  p,    (char *)&(s->s3->tmp.finish_md[0]),i) != 0)
 144                 {
 145                 al=SSL_AD_DECRYPT_ERROR;
 146                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);
 147                 goto f_err;
 148                 }
 149
 150         return(1);
 151 f_err:
 152         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 153         return(0);
 154         }
 155
 156 /* for these 2 messages, we need to
 157  * ssl->enc_read_ctx                    re-init
 158  * ssl->s3->read_sequence               zero
 159  * ssl->s3->read_mac_secret             re-init
 160  * ssl->session->read_sym_enc           assign
 161  * ssl->session->read_compression       assign
 162  * ssl->session->read_hash              assign
 163  */
 164 int ssl3_send_change_cipher_spec(SSL *s, int a, int b)
 165         {
 166         unsigned char *p;
 167
 168         if (s->state == a)
 169                 {
 170                 p=(unsigned char *)s->init_buf->data;
 171                 *p=SSL3_MT_CCS;
 172                 s->init_num=1;
 173                 s->init_off=0;
 174
 175                 s->state=b;
 176                 }
 177
 178         /* SSL3_ST_CW_CHANGE_B */
 179         return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
 180         }
 181
 182 unsigned long ssl3_output_cert_chain(SSL *s, X509 *x)
 183         {
 184         unsigned char *p;
 185         int n,i;
 186         unsigned long l=7;
 187         BUF_MEM *buf;
 188         X509_STORE_CTX xs_ctx;
 189         X509_OBJECT obj;
 190
 191         /* TLSv1 sends a chain with nothing in it, instead of an alert */
 192         buf=s->init_buf;
 193         if (!BUF_MEM_grow(buf,(int)(10)))
 194                 {
 195                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 196                 return(0);
 197                 }
 198         if (x != NULL)
 199                 {
 200                 X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL);
 201
 202                 for (;;)
 203                         {
 204                         n=i2d_X509(x,NULL);
 205                         if (!BUF_MEM_grow(buf,(int)(n+l+3)))
 206                                 {
 207                                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 208                                 return(0);
 209                                 }
 210                         p=(unsigned char *)&(buf->data[l]);
 211                         l2n3(n,p);
 212                         i2d_X509(x,&p);
 213                         l+=n+3;
 214                         if (X509_NAME_cmp(X509_get_subject_name(x),
 215                                 X509_get_issuer_name(x)) == 0) break;
 216
 217                         i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509,
 218                                 X509_get_issuer_name(x),&obj);
 219                         if (i <= 0) break;
 220                         x=obj.data.x509;
 221                         /* Count is one too high since the X509_STORE_get uped the
 222                          * ref count */
 223                         X509_free(x);
 224                         }
 225
 226                 X509_STORE_CTX_cleanup(&xs_ctx);
 227                 }
 228
 229         /* Thawte special :-) */
 230         if (s->ctx->extra_certs != NULL)
 231         for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
 232                 {
 233                 x=sk_X509_value(s->ctx->extra_certs,i);
 234                 n=i2d_X509(x,NULL);
 235                 if (!BUF_MEM_grow(buf,(int)(n+l+3)))
 236                         {
 237                         SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 238                         return(0);
 239                         }
 240                 p=(unsigned char *)&(buf->data[l]);
 241                 l2n3(n,p);
 242                 i2d_X509(x,&p);
 243                 l+=n+3;
 244                 }
 245
 246         l-=7;
 247         p=(unsigned char *)&(buf->data[4]);
 248         l2n3(l,p);
 249         l+=3;
 250         p=(unsigned char *)&(buf->data[0]);
 251         *(p++)=SSL3_MT_CERTIFICATE;
 252         l2n3(l,p);
 253         l+=4;
 254         return(l);
 255         }
 256
 257 long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
 258         {
 259         unsigned char *p;
 260         unsigned long l;
 261         long n;
 262         int i,al;
 263
 264         if (s->s3->tmp.reuse_message)
 265                 {
 266                 s->s3->tmp.reuse_message=0;
 267                 if ((mt >= 0) && (s->s3->tmp.message_type != mt))
 268                         {
 269                         al=SSL_AD_UNEXPECTED_MESSAGE;
 270                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 271                         goto f_err;
 272                         }
 273                 *ok=1;
 274                 return((int)s->s3->tmp.message_size);
 275                 }
 276
 277         p=(unsigned char *)s->init_buf->data;
 278
 279         if (s->state == st1)
 280                 {
 281                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],
 282                                   4-s->init_num);
 283                 if (i < (4-s->init_num))
 284                         {
 285                         *ok=0;
 286                         return(ssl3_part_read(s,i));
 287                         }
 288
 289                 if ((mt >= 0) && (*p != mt))
 290                         {
 291                         al=SSL_AD_UNEXPECTED_MESSAGE;
 292                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 293                         goto f_err;
 294                         }
 295                 if((mt < 0) && (*p == SSL3_MT_CLIENT_HELLO) &&
 296                                         (st1 == SSL3_ST_SR_CERT_A) &&
 297                                         (stn == SSL3_ST_SR_CERT_B))
 298                         {
 299                         /* At this point we have got an MS SGC second client
 300                          * hello. We need to restart the mac and mac the data
 301                          * currently received.
 302                          */
 303                         ssl3_init_finished_mac(s);
 304                         ssl3_finish_mac(s, p + s->init_num, i);
 305                         }
 306
 307                 s->s3->tmp.message_type= *(p++);
 308
 309                 n2l3(p,l);
 310                 if (l > (unsigned long)max)
 311                         {
 312                         al=SSL_AD_ILLEGAL_PARAMETER;
 313                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
 314                         goto f_err;
 315                         }
 316                 if (l && !BUF_MEM_grow(s->init_buf,(int)l))
 317                         {
 318                         SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
 319                         goto err;
 320                         }
 321                 s->s3->tmp.message_size=l;
 322                 s->state=stn;
 323
 324                 s->init_num=0;
 325                 }
 326
 327         /* next state (stn) */
 328         p=(unsigned char *)s->init_buf->data;
 329         n=s->s3->tmp.message_size;
 330         if (n > 0)
 331                 {
 332                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],n);
 333                 if (i != (int)n)
 334                         {
 335                         *ok=0;
 336                         return(ssl3_part_read(s,i));
 337                         }
 338                 }
 339         *ok=1;
 340         return(n);
 341 f_err:
 342         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 343 err:
 344         *ok=0;
 345         return(-1);
 346         }
 347
 348 int ssl_cert_type(X509 *x, EVP_PKEY *pkey)
 349         {
 350         EVP_PKEY *pk;
 351         int ret= -1,i,j;
 352
 353         if (pkey == NULL)
 354                 pk=X509_get_pubkey(x);
 355         else
 356                 pk=pkey;
 357         if (pk == NULL) goto err;
 358
 359         i=pk->type;
 360         if (i == EVP_PKEY_RSA)
 361                 {
 362                 ret=SSL_PKEY_RSA_ENC;
 363                 if (x != NULL)
 364                         {
 365                         j=X509_get_ext_count(x);
 366                         /* check to see if this is a signing only certificate */
 367                         /* EAY EAY EAY EAY */
 368                         }
 369                 }
 370         else if (i == EVP_PKEY_DSA)
 371                 {
 372                 ret=SSL_PKEY_DSA_SIGN;
 373                 }
 374         else if (i == EVP_PKEY_DH)
 375                 {
 376                 /* if we just have a key, we needs to be guess */
 377
 378                 if (x == NULL)
 379                         ret=SSL_PKEY_DH_DSA;
 380                 else
 381                         {
 382                         j=X509_get_signature_type(x);
 383                         if (j == EVP_PKEY_RSA)
 384                                 ret=SSL_PKEY_DH_RSA;
 385                         else if (j== EVP_PKEY_DSA)
 386                                 ret=SSL_PKEY_DH_DSA;
 387                         else ret= -1;
 388                         }
 389                 }
 390         else
 391                 ret= -1;
 392
 393 err:
 394         if(!pkey) EVP_PKEY_free(pk);
 395         return(ret);
 396         }
 397
 398 int ssl_verify_alarm_type(long type)
 399         {
 400         int al;
 401
 402         switch(type)
 403                 {
 404         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
 405         case X509_V_ERR_UNABLE_TO_GET_CRL:
 406                 al=SSL_AD_UNKNOWN_CA;
 407                 break;
 408         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
 409         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
 410         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
 411         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
 412         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
 413         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
 414         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
 415         case X509_V_ERR_CERT_NOT_YET_VALID:
 416         case X509_V_ERR_CRL_NOT_YET_VALID:
 417                 al=SSL_AD_BAD_CERTIFICATE;
 418                 break;
 419         case X509_V_ERR_CERT_SIGNATURE_FAILURE:
 420         case X509_V_ERR_CRL_SIGNATURE_FAILURE:
 421                 al=SSL_AD_DECRYPT_ERROR;
 422                 break;
 423         case X509_V_ERR_CERT_HAS_EXPIRED:
 424         case X509_V_ERR_CRL_HAS_EXPIRED:
 425                 al=SSL_AD_CERTIFICATE_EXPIRED;
 426                 break;
 427         case X509_V_ERR_CERT_REVOKED:
 428                 al=SSL_AD_CERTIFICATE_REVOKED;
 429                 break;
 430         case X509_V_ERR_OUT_OF_MEM:
 431                 al=SSL_AD_INTERNAL_ERROR;
 432                 break;
 433         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
 434         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
 435         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
 436         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
 437         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
 438                 al=SSL_AD_UNKNOWN_CA;
 439                 break;
 440         case X509_V_ERR_APPLICATION_VERIFICATION:
 441                 al=SSL_AD_HANDSHAKE_FAILURE;
 442                 break;
 443         default:
 444                 al=SSL_AD_CERTIFICATE_UNKNOWN;
 445                 break;
 446                 }
 447         return(al);
 448         }
 449
 450 int ssl3_setup_buffers(SSL *s)
 451         {
 452         unsigned char *p;
 453         unsigned int extra;
 454
 455         if (s->s3->rbuf.buf == NULL)
 456                 {
 457                 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 458                         extra=SSL3_RT_MAX_EXTRA;
 459                 else
 460                         extra=0;
 461                 if ((p=(unsigned char *)Malloc(SSL3_RT_MAX_PACKET_SIZE+extra))
 462                         == NULL)
 463                         goto err;
 464                 s->s3->rbuf.buf=p;
 465                 }
 466
 467         if (s->s3->wbuf.buf == NULL)
 468                 {
 469                 if ((p=(unsigned char *)Malloc(SSL3_RT_MAX_PACKET_SIZE))
 470                         == NULL)
 471                         goto err;
 472                 s->s3->wbuf.buf=p;
 473                 }
 474         s->packet= &(s->s3->rbuf.buf[0]);
 475         return(1);
 476 err:
 477         SSLerr(SSL_F_SSL3_SETUP_BUFFERS,ERR_R_MALLOC_FAILURE);
 478         return(0);
 479         }