ssl/s3_both.c

   1 /* ssl/s3_both.c */
   2 /* Copyright (C) 1995-1997 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 "buffer.h"
  61 #include "rand.h"
  62 #include "objects.h"
  63 #include "evp.h"
  64 #include "x509.h"
  65 #include "ssl_locl.h"
  66
  67 #define BREAK   break
  68
  69 /* SSL3err(SSL_F_SSL3_GET_FINISHED,SSL_R_EXCESSIVE_MESSAGE_SIZE);
  70  */
  71
  72 unsigned char ssl3_server_finished_const[4]=
  73         {SSL3_MD_SERVER_FINISHED_CONST};
  74 unsigned char ssl3_client_finished_const[4]=
  75         {SSL3_MD_CLIENT_FINISHED_CONST};
  76
  77 int ssl3_send_finished(s,a,b,sender)
  78 SSL *s;
  79 int a;
  80 int b;
  81 unsigned char *sender;
  82         {
  83         unsigned char *p,*d;
  84         int i;
  85         unsigned long l;
  86
  87         if (s->state == a)
  88                 {
  89                 d=(unsigned char *)s->init_buf->data;
  90                 p= &(d[4]);
  91
  92                 i=ssl3_final_finish_mac(s,&(s->s3->finish_dgst1),sender,p);
  93                 p+=i;
  94                 l=i;
  95                 i=ssl3_final_finish_mac(s,&(s->s3->finish_dgst2),sender,p);
  96                 l+=i;
  97
  98                 *(d++)=SSL3_MT_FINISHED;
  99                 l2n3(l,d);
 100                 s->init_num=(int)l+4;
 101                 s->init_off=0;
 102
 103                 s->state=b;
 104                 }
 105
 106         /* SSL3_ST_SEND_xxxxxx_HELLO_B */
 107         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 108         }
 109
 110 int ssl3_get_finished(s,a,b,sender)
 111 SSL *s;
 112 int a;
 113 int b;
 114 unsigned char *sender;
 115         {
 116         int al,i,j,ok;
 117         long n;
 118         unsigned char *p;
 119
 120         /* the mac has already been generated when we received the
 121          * change cipher spec message and is in s->s3->tmp.in_dgst[12]
 122          */
 123
 124         n=ssl3_get_message(s,
 125                 a,
 126                 b,
 127                 SSL3_MT_FINISHED,
 128                 64, /* should actually be 36+4 :-) */
 129                 &ok);
 130
 131         if (!ok) return((int)n);
 132
 133         /* If this occurs if we has missed a message */
 134         if (!s->s3->change_cipher_spec)
 135                 {
 136                 al=SSL3_AD_UNEXPECTED_MESSAGE;
 137                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_GOT_A_FIN_BEFORE_A_CCS);
 138                 goto f_err;
 139                 }
 140         s->s3->change_cipher_spec=0;
 141
 142         p=(unsigned char *)s->init_buf->data;
 143
 144         i=EVP_MD_CTX_size(&(s->s3->finish_dgst1));
 145         j=EVP_MD_CTX_size(&(s->s3->finish_dgst2));
 146
 147         if ((i+j) != n)
 148                 {
 149                 al=SSL3_AD_ILLEGAL_PARAMETER;
 150                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_BAD_DIGEST_LENGTH);
 151                 goto f_err;
 152                 }
 153
 154         if (    (memcmp(  p,    &(s->s3->tmp.finish_md1[0]),i) != 0) ||
 155                 (memcmp(&(p[i]),&(s->s3->tmp.finish_md2[0]),j) != 0))
 156                 {
 157                 al=SSL3_AD_ILLEGAL_PARAMETER;
 158                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);
 159                 goto f_err;
 160                 }
 161
 162         return(1);
 163 f_err:
 164         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 165         return(0);
 166         }
 167
 168 /* for these 2 messages, we need to
 169  * ssl->enc_read_ctx                    re-init
 170  * ssl->s3->read_sequence               zero
 171  * ssl->s3->read_mac_secret             re-init
 172  * ssl->session->read_sym_enc           assign
 173  * ssl->session->read_compression       assign
 174  * ssl->session->read_hash              assign
 175  */
 176 int ssl3_send_change_cipher_spec(s,a,b)
 177 SSL *s;
 178 int a,b;
 179         {
 180         unsigned char *p;
 181
 182         if (s->state == a)
 183                 {
 184                 p=(unsigned char *)s->init_buf->data;
 185                 *p=SSL3_MT_CCS;
 186                 s->init_num=1;
 187                 s->init_off=0;
 188
 189                 s->state=b;
 190                 }
 191
 192         /* SSL3_ST_CW_CHANGE_B */
 193         return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
 194         }
 195
 196 unsigned long ssl3_output_cert_chain(s,x)
 197 SSL *s;
 198 X509 *x;
 199         {
 200         unsigned char *p;
 201         int n,i;
 202         unsigned long l=7;
 203         BUF_MEM *buf;
 204         X509_STORE_CTX xs_ctx;
 205         X509_OBJECT obj;
 206
 207         X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL);
 208
 209         buf=s->init_buf;
 210         for (;;)
 211                 {
 212                 n=i2d_X509(x,NULL);
 213                 if (!BUF_MEM_grow(buf,(int)(n+l+3)))
 214                         {
 215                         SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 216                         return(0);
 217                         }
 218                 p=(unsigned char *)&(buf->data[l]);
 219                 l2n3(n,p);
 220                 i2d_X509(x,&p);
 221                 l+=n+3;
 222                 if (X509_NAME_cmp(X509_get_subject_name(x),
 223                         X509_get_issuer_name(x)) == 0) break;
 224
 225                 i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509,
 226                         X509_get_issuer_name(x),&obj);
 227                 if (i <= 0) break;
 228                 x=obj.data.x509;
 229                 /* Count is one too high since the X509_STORE_get uped the
 230                  * ref count */
 231                 X509_free(x);
 232                 }
 233
 234         X509_STORE_CTX_cleanup(&xs_ctx);
 235
 236         l-=7;
 237         p=(unsigned char *)&(buf->data[4]);
 238         l2n3(l,p);
 239         l+=3;
 240         p=(unsigned char *)&(buf->data[0]);
 241         *(p++)=SSL3_MT_CERTIFICATE;
 242         l2n3(l,p);
 243         l+=4;
 244         return(l);
 245         }
 246
 247 long ssl3_get_message(s,st1,stn,mt,max,ok)
 248 SSL *s;
 249 int st1,stn,mt;
 250 long max;
 251 int *ok;
 252         {
 253         unsigned char *p;
 254         unsigned long l;
 255         long n;
 256         int i,al;
 257
 258         if (s->s3->tmp.reuse_message)
 259                 {
 260                 s->s3->tmp.reuse_message=0;
 261                 if ((mt >= 0) && (s->s3->tmp.message_type != mt))
 262                         {
 263                         al=SSL3_AD_UNEXPECTED_MESSAGE;
 264                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 265                         goto f_err;
 266                         }
 267                 *ok=1;
 268                 return((int)s->s3->tmp.message_size);
 269                 }
 270
 271         p=(unsigned char *)s->init_buf->data;
 272
 273         if (s->state == st1)
 274                 {
 275                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,
 276                         (char *)&(p[s->init_num]),
 277                         4-s->init_num);
 278                 if (i < (4-s->init_num))
 279                         {
 280                         *ok=0;
 281                         return(ssl3_part_read(s,i));
 282                         }
 283
 284                 if ((mt >= 0) && (*p != mt))
 285                         {
 286                         al=SSL3_AD_UNEXPECTED_MESSAGE;
 287                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 288                         goto f_err;
 289                         }
 290                 s->s3->tmp.message_type= *(p++);
 291
 292                 n2l3(p,l);
 293                 if (l > (unsigned long)max)
 294                         {
 295                         al=SSL3_AD_ILLEGAL_PARAMETER;
 296                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
 297                         goto f_err;
 298                         }
 299                 if (l && !BUF_MEM_grow(s->init_buf,(int)l))
 300                         {
 301                         SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
 302                         goto err;
 303                         }
 304                 s->s3->tmp.message_size=l;
 305                 s->state=stn;
 306
 307                 s->init_num=0;
 308                 }
 309
 310         /* next state (stn) */
 311         p=(unsigned char *)s->init_buf->data;
 312         n=s->s3->tmp.message_size;
 313         if (n > 0)
 314                 {
 315                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,
 316                         (char *)&(p[s->init_num]),(int)n);
 317                 if (i != (int)n)
 318                         {
 319                         *ok=0;
 320                         return(ssl3_part_read(s,i));
 321                         }
 322                 }
 323         *ok=1;
 324         return(n);
 325 f_err:
 326         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 327 err:
 328         *ok=0;
 329         return(-1);
 330         }
 331
 332 int ssl_cert_type(x,pkey)
 333 X509 *x;
 334 EVP_PKEY *pkey;
 335         {
 336         EVP_PKEY *pk;
 337         int ret= -1,i,j;
 338
 339         if (pkey == NULL)
 340                 pk=X509_get_pubkey(x);
 341         else
 342                 pk=pkey;
 343         if (pk == NULL) goto err;
 344
 345         i=pk->type;
 346         if (i == EVP_PKEY_RSA)
 347                 {
 348                 ret=SSL_PKEY_RSA_ENC;
 349                 if (x != NULL)
 350                         {
 351                         j=X509_get_ext_count(x);
 352                         /* check to see if this is a signing only certificate */
 353                         /* EAY EAY EAY EAY */
 354                         }
 355                 }
 356         else if (i == EVP_PKEY_DSA)
 357                 {
 358                 ret=SSL_PKEY_DSA_SIGN;
 359                 }
 360         else if (i == EVP_PKEY_DH)
 361                 {
 362                 /* if we just have a key, we needs to be guess */
 363
 364                 if (x == NULL)
 365                         ret=SSL_PKEY_DH_DSA;
 366                 else
 367                         {
 368                         j=X509_get_signature_type(x);
 369                         if (j == EVP_PKEY_RSA)
 370                                 ret=SSL_PKEY_DH_RSA;
 371                         else if (j== EVP_PKEY_DSA)
 372                                 ret=SSL_PKEY_DH_DSA;
 373                         else ret= -1;
 374                         }
 375                 }
 376         else
 377                 ret= -1;
 378
 379 err:
 380         return(ret);
 381         }
 382
 383 int ssl_verify_alarm_type(type)
 384 int type;
 385         {
 386         int al;
 387
 388         switch(type)
 389                 {
 390         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
 391
 392         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
 393         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
 394         case X509_V_ERR_CERT_SIGNATURE_FAILURE:
 395         case X509_V_ERR_CERT_NOT_YET_VALID:
 396         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
 397         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
 398         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
 399         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
 400         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
 401         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
 402                 al=SSL3_AD_BAD_CERTIFICATE;
 403                 break;
 404         case X509_V_ERR_CERT_HAS_EXPIRED:
 405                 al=SSL3_AD_CERTIFICATE_EXPIRED;
 406                 break;
 407         default:
 408                 al=SSL3_AD_CERTIFICATE_UNKNOWN;
 409                 break;
 410                 }
 411         return(al);
 412         }
 413
 414 int ssl3_setup_buffers(s)
 415 SSL *s;
 416         {
 417         unsigned char *p;
 418         unsigned int extra;
 419
 420         if (s->s3->rbuf.buf == NULL)
 421                 {
 422                 if (s->ctx->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 423                         extra=SSL3_RT_MAX_EXTRA;
 424                 else
 425                         extra=0;
 426                 if ((p=(unsigned char *)Malloc(SSL3_RT_MAX_PACKET_SIZE+extra))
 427                         == NULL)
 428                         goto err;
 429                 s->s3->rbuf.buf=p;
 430                 }
 431
 432         if (s->s3->wbuf.buf == NULL)
 433                 {
 434                 if ((p=(unsigned char *)Malloc(SSL3_RT_MAX_PACKET_SIZE))
 435                         == NULL)
 436                         goto err;
 437                 s->s3->wbuf.buf=p;
 438                 }
 439         s->packet= &(s->s3->rbuf.buf[0]);
 440         return(1);
 441 err:
 442         SSLerr(SSL_F_SSL3_SETUP_BUFFERS,ERR_R_MALLOC_FAILURE);
 443         return(0);
 444         }