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(SSL *s, int a, int b, unsigned char *sender,
  73              int slen)
  74         {
  75         unsigned char *p,*d;
  76         int i;
  77         unsigned long l;
  78
  79         if (s->state == a)
  80                 {
  81                 d=(unsigned char *)s->init_buf->data;
  82                 p= &(d[4]);
  83
  84                 i=s->method->ssl3_enc->final_finish_mac(s,
  85                         &(s->s3->finish_dgst1),
  86                         &(s->s3->finish_dgst2),
  87                         sender,slen,p);
  88                 p+=i;
  89                 l=i;
  90
  91 #ifdef WIN16
  92                 /* MSVC 1.5 does not clear the top bytes of the word unless
  93                  * I do this.
  94                  */
  95                 l&=0xffff;
  96 #endif
  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(SSL *s, int a, int b)
 111         {
 112         int al,i,ok;
 113         long n;
 114         unsigned char *p;
 115
 116         /* the mac has already been generated when we received the
 117          * change cipher spec message and is in s->s3->tmp.in_dgst[12]
 118          */
 119
 120         n=ssl3_get_message(s,
 121                 a,
 122                 b,
 123                 SSL3_MT_FINISHED,
 124                 64, /* should actually be 36+4 :-) */
 125                 &ok);
 126
 127         if (!ok) return((int)n);
 128
 129         /* If this occurs if we has missed a message */
 130         if (!s->s3->change_cipher_spec)
 131                 {
 132                 al=SSL_AD_UNEXPECTED_MESSAGE;
 133                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_GOT_A_FIN_BEFORE_A_CCS);
 134                 goto f_err;
 135                 }
 136         s->s3->change_cipher_spec=0;
 137
 138         p=(unsigned char *)s->init_buf->data;
 139
 140         i=s->method->ssl3_enc->finish_mac_length;
 141
 142         if (i != n)
 143                 {
 144                 al=SSL_AD_DECODE_ERROR;
 145                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_BAD_DIGEST_LENGTH);
 146                 goto f_err;
 147                 }
 148
 149         if (memcmp(  p,    (char *)&(s->s3->tmp.finish_md[0]),i) != 0)
 150                 {
 151                 al=SSL_AD_DECRYPT_ERROR;
 152                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);
 153                 goto f_err;
 154                 }
 155
 156         return(1);
 157 f_err:
 158         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 159         return(0);
 160         }
 161
 162 /* for these 2 messages, we need to
 163  * ssl->enc_read_ctx                    re-init
 164  * ssl->s3->read_sequence               zero
 165  * ssl->s3->read_mac_secret             re-init
 166  * ssl->session->read_sym_enc           assign
 167  * ssl->session->read_compression       assign
 168  * ssl->session->read_hash              assign
 169  */
 170 int ssl3_send_change_cipher_spec(SSL *s, int a, int b)
 171         {
 172         unsigned char *p;
 173
 174         if (s->state == a)
 175                 {
 176                 p=(unsigned char *)s->init_buf->data;
 177                 *p=SSL3_MT_CCS;
 178                 s->init_num=1;
 179                 s->init_off=0;
 180
 181                 s->state=b;
 182                 }
 183
 184         /* SSL3_ST_CW_CHANGE_B */
 185         return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
 186         }
 187
 188 unsigned long ssl3_output_cert_chain(SSL *s, X509 *x)
 189         {
 190         unsigned char *p;
 191         int n,i;
 192         unsigned long l=7;
 193         BUF_MEM *buf;
 194         X509_STORE_CTX xs_ctx;
 195         X509_OBJECT obj;
 196
 197         /* TLSv1 sends a chain with nothing in it, instead of an alert */
 198         buf=s->init_buf;
 199         if (!BUF_MEM_grow(buf,(int)(10)))
 200                 {
 201                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 202                 return(0);
 203                 }
 204         if (x != NULL)
 205                 {
 206                 X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL);
 207
 208                 for (;;)
 209                         {
 210                         n=i2d_X509(x,NULL);
 211                         if (!BUF_MEM_grow(buf,(int)(n+l+3)))
 212                                 {
 213                                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 214                                 return(0);
 215                                 }
 216                         p=(unsigned char *)&(buf->data[l]);
 217                         l2n3(n,p);
 218                         i2d_X509(x,&p);
 219                         l+=n+3;
 220                         if (X509_NAME_cmp(X509_get_subject_name(x),
 221                                 X509_get_issuer_name(x)) == 0) break;
 222
 223                         i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509,
 224                                 X509_get_issuer_name(x),&obj);
 225                         if (i <= 0) break;
 226                         x=obj.data.x509;
 227                         /* Count is one too high since the X509_STORE_get uped the
 228                          * ref count */
 229                         X509_free(x);
 230                         }
 231
 232                 X509_STORE_CTX_cleanup(&xs_ctx);
 233                 }
 234
 235         /* Thawte special :-) */
 236         if (s->ctx->extra_certs != NULL)
 237         for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
 238                 {
 239                 x=sk_X509_value(s->ctx->extra_certs,i);
 240                 n=i2d_X509(x,NULL);
 241                 if (!BUF_MEM_grow(buf,(int)(n+l+3)))
 242                         {
 243                         SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 244                         return(0);
 245                         }
 246                 p=(unsigned char *)&(buf->data[l]);
 247                 l2n3(n,p);
 248                 i2d_X509(x,&p);
 249                 l+=n+3;
 250                 }
 251
 252         l-=7;
 253         p=(unsigned char *)&(buf->data[4]);
 254         l2n3(l,p);
 255         l+=3;
 256         p=(unsigned char *)&(buf->data[0]);
 257         *(p++)=SSL3_MT_CERTIFICATE;
 258         l2n3(l,p);
 259         l+=4;
 260         return(l);
 261         }
 262
 263 long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
 264         {
 265         unsigned char *p;
 266         unsigned long l;
 267         long n;
 268         int i,al;
 269
 270         if (s->s3->tmp.reuse_message)
 271                 {
 272                 s->s3->tmp.reuse_message=0;
 273                 if ((mt >= 0) && (s->s3->tmp.message_type != mt))
 274                         {
 275                         al=SSL_AD_UNEXPECTED_MESSAGE;
 276                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 277                         goto f_err;
 278                         }
 279                 *ok=1;
 280                 return((int)s->s3->tmp.message_size);
 281                 }
 282
 283         p=(unsigned char *)s->init_buf->data;
 284
 285         if (s->state == st1)
 286                 {
 287                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,
 288                         (char *)&(p[s->init_num]),
 289                         4-s->init_num);
 290                 if (i < (4-s->init_num))
 291                         {
 292                         *ok=0;
 293                         return(ssl3_part_read(s,i));
 294                         }
 295
 296                 if ((mt >= 0) && (*p != 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                 s->s3->tmp.message_type= *(p++);
 303
 304                 n2l3(p,l);
 305                 if (l > (unsigned long)max)
 306                         {
 307                         al=SSL_AD_ILLEGAL_PARAMETER;
 308                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
 309                         goto f_err;
 310                         }
 311                 if (l && !BUF_MEM_grow(s->init_buf,(int)l))
 312                         {
 313                         SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
 314                         goto err;
 315                         }
 316                 s->s3->tmp.message_size=l;
 317                 s->state=stn;
 318
 319                 s->init_num=0;
 320                 }
 321
 322         /* next state (stn) */
 323         p=(unsigned char *)s->init_buf->data;
 324         n=s->s3->tmp.message_size;
 325         if (n > 0)
 326                 {
 327                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,
 328                         (char *)&(p[s->init_num]),(int)n);
 329                 if (i != (int)n)
 330                         {
 331                         *ok=0;
 332                         return(ssl3_part_read(s,i));
 333                         }
 334                 }
 335         *ok=1;
 336         return(n);
 337 f_err:
 338         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 339 err:
 340         *ok=0;
 341         return(-1);
 342         }
 343
 344 int ssl_cert_type(X509 *x, EVP_PKEY *pkey)
 345         {
 346         EVP_PKEY *pk;
 347         int ret= -1,i,j;
 348
 349         if (pkey == NULL)
 350                 pk=X509_get_pubkey(x);
 351         else
 352                 pk=pkey;
 353         if (pk == NULL) goto err;
 354
 355         i=pk->type;
 356         if (i == EVP_PKEY_RSA)
 357                 {
 358                 ret=SSL_PKEY_RSA_ENC;
 359                 if (x != NULL)
 360                         {
 361                         j=X509_get_ext_count(x);
 362                         /* check to see if this is a signing only certificate */
 363                         /* EAY EAY EAY EAY */
 364                         }
 365                 }
 366         else if (i == EVP_PKEY_DSA)
 367                 {
 368                 ret=SSL_PKEY_DSA_SIGN;
 369                 }
 370         else if (i == EVP_PKEY_DH)
 371                 {
 372                 /* if we just have a key, we needs to be guess */
 373
 374                 if (x == NULL)
 375                         ret=SSL_PKEY_DH_DSA;
 376                 else
 377                         {
 378                         j=X509_get_signature_type(x);
 379                         if (j == EVP_PKEY_RSA)
 380                                 ret=SSL_PKEY_DH_RSA;
 381                         else if (j== EVP_PKEY_DSA)
 382                                 ret=SSL_PKEY_DH_DSA;
 383                         else ret= -1;
 384                         }
 385                 }
 386         else
 387                 ret= -1;
 388
 389 err:
 390         if(!pkey) EVP_PKEY_free(pk);
 391         return(ret);
 392         }
 393
 394 int ssl_verify_alarm_type(long type)
 395         {
 396         int al;
 397
 398         switch(type)
 399                 {
 400         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
 401         case X509_V_ERR_UNABLE_TO_GET_CRL:
 402                 al=SSL_AD_UNKNOWN_CA;
 403                 break;
 404         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
 405         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
 406         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
 407         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
 408         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
 409         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
 410         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
 411         case X509_V_ERR_CERT_NOT_YET_VALID:
 412         case X509_V_ERR_CRL_NOT_YET_VALID:
 413                 al=SSL_AD_BAD_CERTIFICATE;
 414                 break;
 415         case X509_V_ERR_CERT_SIGNATURE_FAILURE:
 416         case X509_V_ERR_CRL_SIGNATURE_FAILURE:
 417                 al=SSL_AD_DECRYPT_ERROR;
 418                 break;
 419         case X509_V_ERR_CERT_HAS_EXPIRED:
 420         case X509_V_ERR_CRL_HAS_EXPIRED:
 421                 al=SSL_AD_CERTIFICATE_EXPIRED;
 422                 break;
 423         case X509_V_ERR_CERT_REVOKED:
 424                 al=SSL_AD_CERTIFICATE_REVOKED;
 425                 break;
 426         case X509_V_ERR_OUT_OF_MEM:
 427                 al=SSL_AD_INTERNAL_ERROR;
 428                 break;
 429         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
 430         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
 431         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
 432         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
 433         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
 434                 al=SSL_AD_UNKNOWN_CA;
 435                 break;
 436         case X509_V_ERR_APPLICATION_VERIFICATION:
 437                 al=SSL_AD_HANDSHAKE_FAILURE;
 438                 break;
 439         default:
 440                 al=SSL_AD_CERTIFICATE_UNKNOWN;
 441                 break;
 442                 }
 443         return(al);
 444         }
 445
 446 int ssl3_setup_buffers(SSL *s)
 447         {
 448         unsigned char *p;
 449         unsigned int extra;
 450
 451         if (s->s3->rbuf.buf == NULL)
 452                 {
 453                 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 454                         extra=SSL3_RT_MAX_EXTRA;
 455                 else
 456                         extra=0;
 457                 if ((p=(unsigned char *)Malloc(SSL3_RT_MAX_PACKET_SIZE+extra))
 458                         == NULL)
 459                         goto err;
 460                 s->s3->rbuf.buf=p;
 461                 }
 462
 463         if (s->s3->wbuf.buf == NULL)
 464                 {
 465                 if ((p=(unsigned char *)Malloc(SSL3_RT_MAX_PACKET_SIZE))
 466                         == NULL)
 467                         goto err;
 468                 s->s3->wbuf.buf=p;
 469                 }
 470         s->packet= &(s->s3->rbuf.buf[0]);
 471         return(1);
 472 err:
 473         SSLerr(SSL_F_SSL3_SETUP_BUFFERS,ERR_R_MALLOC_FAILURE);
 474         return(0);
 475         }