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