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 "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 int ssl3_send_finished(s,a,b,sender,slen)
  73 SSL *s;
  74 int a;
  75 int b;
  76 unsigned char *sender;
  77 int slen;
  78         {
  79         unsigned char *p,*d;
  80         int i;
  81         unsigned long l;
  82
  83         if (s->state == a)
  84                 {
  85                 d=(unsigned char *)s->init_buf->data;
  86                 p= &(d[4]);
  87
  88                 i=s->method->ssl3_enc->final_finish_mac(s,
  89                         &(s->s3->finish_dgst1),
  90                         &(s->s3->finish_dgst2),
  91                         sender,slen,p);
  92                 p+=i;
  93                 l=i;
  94
  95 #ifdef WIN16
  96                 /* MSVC 1.5 does not clear the top bytes of the word unless
  97                  * I do this.
  98                  */
  99                 l&=0xffff;
 100 #endif
 101
 102                 *(d++)=SSL3_MT_FINISHED;
 103                 l2n3(l,d);
 104                 s->init_num=(int)l+4;
 105                 s->init_off=0;
 106
 107                 s->state=b;
 108                 }
 109
 110         /* SSL3_ST_SEND_xxxxxx_HELLO_B */
 111         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 112         }
 113
 114 int ssl3_get_finished(s,a,b)
 115 SSL *s;
 116 int a;
 117 int b;
 118         {
 119         int al,i,ok;
 120         long n;
 121         unsigned char *p;
 122
 123         /* the mac has already been generated when we received the
 124          * change cipher spec message and is in s->s3->tmp.in_dgst[12]
 125          */
 126
 127         n=ssl3_get_message(s,
 128                 a,
 129                 b,
 130                 SSL3_MT_FINISHED,
 131                 64, /* should actually be 36+4 :-) */
 132                 &ok);
 133
 134         if (!ok) return((int)n);
 135
 136         /* If this occurs if we has missed a message */
 137         if (!s->s3->change_cipher_spec)
 138                 {
 139                 al=SSL_AD_UNEXPECTED_MESSAGE;
 140                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_GOT_A_FIN_BEFORE_A_CCS);
 141                 goto f_err;
 142                 }
 143         s->s3->change_cipher_spec=0;
 144
 145         p=(unsigned char *)s->init_buf->data;
 146
 147         i=s->method->ssl3_enc->finish_mac_length;
 148
 149         if (i != n)
 150                 {
 151                 al=SSL_AD_DECODE_ERROR;
 152                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_BAD_DIGEST_LENGTH);
 153                 goto f_err;
 154                 }
 155
 156         if (memcmp(  p,    (char *)&(s->s3->tmp.finish_md[0]),i) != 0)
 157                 {
 158                 al=SSL_AD_DECRYPT_ERROR;
 159                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);
 160                 goto f_err;
 161                 }
 162
 163         return(1);
 164 f_err:
 165         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 166         return(0);
 167         }
 168
 169 /* for these 2 messages, we need to
 170  * ssl->enc_read_ctx                    re-init
 171  * ssl->s3->read_sequence               zero
 172  * ssl->s3->read_mac_secret             re-init
 173  * ssl->session->read_sym_enc           assign
 174  * ssl->session->read_compression       assign
 175  * ssl->session->read_hash              assign
 176  */
 177 int ssl3_send_change_cipher_spec(s,a,b)
 178 SSL *s;
 179 int a,b;
 180         {
 181         unsigned char *p;
 182
 183         if (s->state == a)
 184                 {
 185                 p=(unsigned char *)s->init_buf->data;
 186                 *p=SSL3_MT_CCS;
 187                 s->init_num=1;
 188                 s->init_off=0;
 189
 190                 s->state=b;
 191                 }
 192
 193         /* SSL3_ST_CW_CHANGE_B */
 194         return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
 195         }
 196
 197 unsigned long ssl3_output_cert_chain(s,x)
 198 SSL *s;
 199 X509 *x;
 200         {
 201         unsigned char *p;
 202         int n,i;
 203         unsigned long l=7;
 204         BUF_MEM *buf;
 205         X509_STORE_CTX xs_ctx;
 206         X509_OBJECT obj;
 207
 208         /* TLSv1 sends a chain with nothing in it, instead of an alert */
 209         buf=s->init_buf;
 210         if (!BUF_MEM_grow(buf,(int)(10)))
 211                 {
 212                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 213                 return(0);
 214                 }
 215         if (x != NULL)
 216                 {
 217                 X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL);
 218
 219                 for (;;)
 220                         {
 221                         n=i2d_X509(x,NULL);
 222                         if (!BUF_MEM_grow(buf,(int)(n+l+3)))
 223                                 {
 224                                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 225                                 return(0);
 226                                 }
 227                         p=(unsigned char *)&(buf->data[l]);
 228                         l2n3(n,p);
 229                         i2d_X509(x,&p);
 230                         l+=n+3;
 231                         if (X509_NAME_cmp(X509_get_subject_name(x),
 232                                 X509_get_issuer_name(x)) == 0) break;
 233
 234                         i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509,
 235                                 X509_get_issuer_name(x),&obj);
 236                         if (i <= 0) break;
 237                         x=obj.data.x509;
 238                         /* Count is one too high since the X509_STORE_get uped the
 239                          * ref count */
 240                         X509_free(x);
 241                         }
 242
 243                 X509_STORE_CTX_cleanup(&xs_ctx);
 244                 }
 245
 246         /* Thawte special :-) */
 247         if (s->ctx->extra_certs != NULL)
 248         for (i=0; i<sk_num(s->ctx->extra_certs); i++)
 249                 {
 250                 x=(X509 *)sk_value(s->ctx->extra_certs,i);
 251                 n=i2d_X509(x,NULL);
 252                 if (!BUF_MEM_grow(buf,(int)(n+l+3)))
 253                         {
 254                         SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 255                         return(0);
 256                         }
 257                 p=(unsigned char *)&(buf->data[l]);
 258                 l2n3(n,p);
 259                 i2d_X509(x,&p);
 260                 l+=n+3;
 261                 }
 262
 263         l-=7;
 264         p=(unsigned char *)&(buf->data[4]);
 265         l2n3(l,p);
 266         l+=3;
 267         p=(unsigned char *)&(buf->data[0]);
 268         *(p++)=SSL3_MT_CERTIFICATE;
 269         l2n3(l,p);
 270         l+=4;
 271         return(l);
 272         }
 273
 274 long ssl3_get_message(s,st1,stn,mt,max,ok)
 275 SSL *s;
 276 int st1,stn,mt;
 277 long max;
 278 int *ok;
 279         {
 280         unsigned char *p;
 281         unsigned long l;
 282         long n;
 283         int i,al;
 284
 285         if (s->s3->tmp.reuse_message)
 286                 {
 287                 s->s3->tmp.reuse_message=0;
 288                 if ((mt >= 0) && (s->s3->tmp.message_type != mt))
 289                         {
 290                         al=SSL_AD_UNEXPECTED_MESSAGE;
 291                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 292                         goto f_err;
 293                         }
 294                 *ok=1;
 295                 return((int)s->s3->tmp.message_size);
 296                 }
 297
 298         p=(unsigned char *)s->init_buf->data;
 299
 300         if (s->state == st1)
 301                 {
 302                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,
 303                         (char *)&(p[s->init_num]),
 304                         4-s->init_num);
 305                 if (i < (4-s->init_num))
 306                         {
 307                         *ok=0;
 308                         return(ssl3_part_read(s,i));
 309                         }
 310
 311                 if ((mt >= 0) && (*p != mt))
 312                         {
 313                         al=SSL_AD_UNEXPECTED_MESSAGE;
 314                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 315                         goto f_err;
 316                         }
 317                 s->s3->tmp.message_type= *(p++);
 318
 319                 n2l3(p,l);
 320                 if (l > (unsigned long)max)
 321                         {
 322                         al=SSL_AD_ILLEGAL_PARAMETER;
 323                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
 324                         goto f_err;
 325                         }
 326                 if (l && !BUF_MEM_grow(s->init_buf,(int)l))
 327                         {
 328                         SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
 329                         goto err;
 330                         }
 331                 s->s3->tmp.message_size=l;
 332                 s->state=stn;
 333
 334                 s->init_num=0;
 335                 }
 336
 337         /* next state (stn) */
 338         p=(unsigned char *)s->init_buf->data;
 339         n=s->s3->tmp.message_size;
 340         if (n > 0)
 341                 {
 342                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,
 343                         (char *)&(p[s->init_num]),(int)n);
 344                 if (i != (int)n)
 345                         {
 346                         *ok=0;
 347                         return(ssl3_part_read(s,i));
 348                         }
 349                 }
 350         *ok=1;
 351         return(n);
 352 f_err:
 353         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 354 err:
 355         *ok=0;
 356         return(-1);
 357         }
 358
 359 int ssl_cert_type(x,pkey)
 360 X509 *x;
 361 EVP_PKEY *pkey;
 362         {
 363         EVP_PKEY *pk;
 364         int ret= -1,i,j;
 365
 366         if (pkey == NULL)
 367                 pk=X509_get_pubkey(x);
 368         else
 369                 pk=pkey;
 370         if (pk == NULL) goto err;
 371
 372         i=pk->type;
 373         if (i == EVP_PKEY_RSA)
 374                 {
 375                 ret=SSL_PKEY_RSA_ENC;
 376                 if (x != NULL)
 377                         {
 378                         j=X509_get_ext_count(x);
 379                         /* check to see if this is a signing only certificate */
 380                         /* EAY EAY EAY EAY */
 381                         }
 382                 }
 383         else if (i == EVP_PKEY_DSA)
 384                 {
 385                 ret=SSL_PKEY_DSA_SIGN;
 386                 }
 387         else if (i == EVP_PKEY_DH)
 388                 {
 389                 /* if we just have a key, we needs to be guess */
 390
 391                 if (x == NULL)
 392                         ret=SSL_PKEY_DH_DSA;
 393                 else
 394                         {
 395                         j=X509_get_signature_type(x);
 396                         if (j == EVP_PKEY_RSA)
 397                                 ret=SSL_PKEY_DH_RSA;
 398                         else if (j== EVP_PKEY_DSA)
 399                                 ret=SSL_PKEY_DH_DSA;
 400                         else ret= -1;
 401                         }
 402                 }
 403         else
 404                 ret= -1;
 405
 406 err:
 407         return(ret);
 408         }
 409
 410 int ssl_verify_alarm_type(type)
 411 long type;
 412         {
 413         int al;
 414
 415         switch(type)
 416                 {
 417         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
 418         case X509_V_ERR_UNABLE_TO_GET_CRL:
 419                 al=SSL_AD_UNKNOWN_CA;
 420                 break;
 421         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
 422         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
 423         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
 424         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
 425         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
 426         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
 427         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
 428         case X509_V_ERR_CERT_NOT_YET_VALID:
 429         case X509_V_ERR_CRL_NOT_YET_VALID:
 430                 al=SSL_AD_BAD_CERTIFICATE;
 431                 break;
 432         case X509_V_ERR_CERT_SIGNATURE_FAILURE:
 433         case X509_V_ERR_CRL_SIGNATURE_FAILURE:
 434                 al=SSL_AD_DECRYPT_ERROR;
 435                 break;
 436         case X509_V_ERR_CERT_HAS_EXPIRED:
 437         case X509_V_ERR_CRL_HAS_EXPIRED:
 438                 al=SSL_AD_CERTIFICATE_EXPIRED;
 439                 break;
 440         case X509_V_ERR_CERT_REVOKED:
 441                 al=SSL_AD_CERTIFICATE_REVOKED;
 442                 break;
 443         case X509_V_ERR_OUT_OF_MEM:
 444                 al=SSL_AD_INTERNAL_ERROR;
 445                 break;
 446         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
 447         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
 448         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
 449         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
 450         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
 451                 al=SSL_AD_UNKNOWN_CA;
 452                 break;
 453         case X509_V_ERR_APPLICATION_VERIFICATION:
 454                 al=SSL_AD_HANDSHAKE_FAILURE;
 455                 break;
 456         default:
 457                 al=SSL_AD_CERTIFICATE_UNKNOWN;
 458                 break;
 459                 }
 460         return(al);
 461         }
 462
 463 int ssl3_setup_buffers(s)
 464 SSL *s;
 465         {
 466         unsigned char *p;
 467         unsigned int extra;
 468
 469         if (s->s3->rbuf.buf == NULL)
 470                 {
 471                 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 472                         extra=SSL3_RT_MAX_EXTRA;
 473                 else
 474                         extra=0;
 475                 if ((p=(unsigned char *)Malloc(SSL3_RT_MAX_PACKET_SIZE+extra))
 476                         == NULL)
 477                         goto err;
 478                 s->s3->rbuf.buf=p;
 479                 }
 480
 481         if (s->s3->wbuf.buf == NULL)
 482                 {
 483                 if ((p=(unsigned char *)Malloc(SSL3_RT_MAX_PACKET_SIZE))
 484                         == NULL)
 485                         goto err;
 486                 s->s3->wbuf.buf=p;
 487                 }
 488         s->packet= &(s->s3->rbuf.buf[0]);
 489         return(1);
 490 err:
 491         SSLerr(SSL_F_SSL3_SETUP_BUFFERS,ERR_R_MALLOC_FAILURE);
 492         return(0);
 493         }