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                 *(d++)=SSL3_MT_FINISHED;
  96                 l2n3(l,d);
  97                 s->init_num=(int)l+4;
  98                 s->init_off=0;
  99
 100                 s->state=b;
 101                 }
 102
 103         /* SSL3_ST_SEND_xxxxxx_HELLO_B */
 104         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 105         }
 106
 107 int ssl3_get_finished(s,a,b)
 108 SSL *s;
 109 int a;
 110 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(s,a,b)
 171 SSL *s;
 172 int a,b;
 173         {
 174         unsigned char *p;
 175
 176         if (s->state == a)
 177                 {
 178                 p=(unsigned char *)s->init_buf->data;
 179                 *p=SSL3_MT_CCS;
 180                 s->init_num=1;
 181                 s->init_off=0;
 182
 183                 s->state=b;
 184                 }
 185
 186         /* SSL3_ST_CW_CHANGE_B */
 187         return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
 188         }
 189
 190 unsigned long ssl3_output_cert_chain(s,x)
 191 SSL *s;
 192 X509 *x;
 193         {
 194         unsigned char *p;
 195         int n,i;
 196         unsigned long l=7;
 197         BUF_MEM *buf;
 198         X509_STORE_CTX xs_ctx;
 199         X509_OBJECT obj;
 200
 201         /* TLSv1 sends a chain with nothing in it, instead of an alert */
 202         buf=s->init_buf;
 203         if (!BUF_MEM_grow(buf,(int)(10)))
 204                 {
 205                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 206                 return(0);
 207                 }
 208         if (x != NULL)
 209                 {
 210                 X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL);
 211
 212                 for (;;)
 213                         {
 214                         n=i2d_X509(x,NULL);
 215                         if (!BUF_MEM_grow(buf,(int)(n+l+3)))
 216                                 {
 217                                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 218                                 return(0);
 219                                 }
 220                         p=(unsigned char *)&(buf->data[l]);
 221                         l2n3(n,p);
 222                         i2d_X509(x,&p);
 223                         l+=n+3;
 224                         if (X509_NAME_cmp(X509_get_subject_name(x),
 225                                 X509_get_issuer_name(x)) == 0) break;
 226
 227                         i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509,
 228                                 X509_get_issuer_name(x),&obj);
 229                         if (i <= 0) break;
 230                         x=obj.data.x509;
 231                         /* Count is one too high since the X509_STORE_get uped the
 232                          * ref count */
 233                         X509_free(x);
 234                         }
 235
 236                 X509_STORE_CTX_cleanup(&xs_ctx);
 237                 }
 238
 239         l-=7;
 240         p=(unsigned char *)&(buf->data[4]);
 241         l2n3(l,p);
 242         l+=3;
 243         p=(unsigned char *)&(buf->data[0]);
 244         *(p++)=SSL3_MT_CERTIFICATE;
 245         l2n3(l,p);
 246         l+=4;
 247         return(l);
 248         }
 249
 250 long ssl3_get_message(s,st1,stn,mt,max,ok)
 251 SSL *s;
 252 int st1,stn,mt;
 253 long max;
 254 int *ok;
 255         {
 256         unsigned char *p;
 257         unsigned long l;
 258         long n;
 259         int i,al;
 260
 261         if (s->s3->tmp.reuse_message)
 262                 {
 263                 s->s3->tmp.reuse_message=0;
 264                 if ((mt >= 0) && (s->s3->tmp.message_type != mt))
 265                         {
 266                         al=SSL_AD_UNEXPECTED_MESSAGE;
 267                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 268                         goto f_err;
 269                         }
 270                 *ok=1;
 271                 return((int)s->s3->tmp.message_size);
 272                 }
 273
 274         p=(unsigned char *)s->init_buf->data;
 275
 276         if (s->state == st1)
 277                 {
 278                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,
 279                         (char *)&(p[s->init_num]),
 280                         4-s->init_num);
 281                 if (i < (4-s->init_num))
 282                         {
 283                         *ok=0;
 284                         return(ssl3_part_read(s,i));
 285                         }
 286
 287                 if ((mt >= 0) && (*p != mt))
 288                         {
 289                         al=SSL_AD_UNEXPECTED_MESSAGE;
 290                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 291                         goto f_err;
 292                         }
 293                 s->s3->tmp.message_type= *(p++);
 294
 295                 n2l3(p,l);
 296                 if (l > (unsigned long)max)
 297                         {
 298                         al=SSL_AD_ILLEGAL_PARAMETER;
 299                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
 300                         goto f_err;
 301                         }
 302                 if (l && !BUF_MEM_grow(s->init_buf,(int)l))
 303                         {
 304                         SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
 305                         goto err;
 306                         }
 307                 s->s3->tmp.message_size=l;
 308                 s->state=stn;
 309
 310                 s->init_num=0;
 311                 }
 312
 313         /* next state (stn) */
 314         p=(unsigned char *)s->init_buf->data;
 315         n=s->s3->tmp.message_size;
 316         if (n > 0)
 317                 {
 318                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,
 319                         (char *)&(p[s->init_num]),(int)n);
 320                 if (i != (int)n)
 321                         {
 322                         *ok=0;
 323                         return(ssl3_part_read(s,i));
 324                         }
 325                 }
 326         *ok=1;
 327         return(n);
 328 f_err:
 329         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 330 err:
 331         *ok=0;
 332         return(-1);
 333         }
 334
 335 int ssl_cert_type(x,pkey)
 336 X509 *x;
 337 EVP_PKEY *pkey;
 338         {
 339         EVP_PKEY *pk;
 340         int ret= -1,i,j;
 341
 342         if (pkey == NULL)
 343                 pk=X509_get_pubkey(x);
 344         else
 345                 pk=pkey;
 346         if (pk == NULL) goto err;
 347
 348         i=pk->type;
 349         if (i == EVP_PKEY_RSA)
 350                 {
 351                 ret=SSL_PKEY_RSA_ENC;
 352                 if (x != NULL)
 353                         {
 354                         j=X509_get_ext_count(x);
 355                         /* check to see if this is a signing only certificate */
 356                         /* EAY EAY EAY EAY */
 357                         }
 358                 }
 359         else if (i == EVP_PKEY_DSA)
 360                 {
 361                 ret=SSL_PKEY_DSA_SIGN;
 362                 }
 363         else if (i == EVP_PKEY_DH)
 364                 {
 365                 /* if we just have a key, we needs to be guess */
 366
 367                 if (x == NULL)
 368                         ret=SSL_PKEY_DH_DSA;
 369                 else
 370                         {
 371                         j=X509_get_signature_type(x);
 372                         if (j == EVP_PKEY_RSA)
 373                                 ret=SSL_PKEY_DH_RSA;
 374                         else if (j== EVP_PKEY_DSA)
 375                                 ret=SSL_PKEY_DH_DSA;
 376                         else ret= -1;
 377                         }
 378                 }
 379         else
 380                 ret= -1;
 381
 382 err:
 383         return(ret);
 384         }
 385
 386 int ssl_verify_alarm_type(type)
 387 long type;
 388         {
 389         int al;
 390
 391         switch(type)
 392                 {
 393         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
 394         case X509_V_ERR_UNABLE_TO_GET_CRL:
 395                 al=SSL_AD_UNKNOWN_CA;
 396                 break;
 397         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
 398         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
 399         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
 400         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
 401         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
 402         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
 403         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
 404         case X509_V_ERR_CERT_NOT_YET_VALID:
 405         case X509_V_ERR_CRL_NOT_YET_VALID:
 406                 al=SSL_AD_BAD_CERTIFICATE;
 407                 break;
 408         case X509_V_ERR_CERT_SIGNATURE_FAILURE:
 409         case X509_V_ERR_CRL_SIGNATURE_FAILURE:
 410                 al=SSL_AD_DECRYPT_ERROR;
 411                 break;
 412         case X509_V_ERR_CERT_HAS_EXPIRED:
 413         case X509_V_ERR_CRL_HAS_EXPIRED:
 414                 al=SSL_AD_CERTIFICATE_EXPIRED;
 415                 break;
 416         case X509_V_ERR_CERT_REVOKED:
 417                 al=SSL_AD_CERTIFICATE_REVOKED;
 418                 break;
 419         case X509_V_ERR_OUT_OF_MEM:
 420                 al=SSL_AD_INTERNAL_ERROR;
 421                 break;
 422         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
 423         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
 424         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
 425         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
 426         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
 427                 al=SSL_AD_UNKNOWN_CA;
 428                 break;
 429         case X509_V_ERR_APPLICATION_VERIFICATION:
 430                 al=SSL_AD_HANDSHAKE_FAILURE;
 431                 break;
 432         default:
 433                 al=SSL_AD_CERTIFICATE_UNKNOWN;
 434                 break;
 435                 }
 436         return(al);
 437         }
 438
 439 int ssl3_setup_buffers(s)
 440 SSL *s;
 441         {
 442         unsigned char *p;
 443         unsigned int extra;
 444
 445         if (s->s3->rbuf.buf == NULL)
 446                 {
 447                 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 448                         extra=SSL3_RT_MAX_EXTRA;
 449                 else
 450                         extra=0;
 451                 if ((p=(unsigned char *)Malloc(SSL3_RT_MAX_PACKET_SIZE+extra))
 452                         == NULL)
 453                         goto err;
 454                 s->s3->rbuf.buf=p;
 455                 }
 456
 457         if (s->s3->wbuf.buf == NULL)
 458                 {
 459                 if ((p=(unsigned char *)Malloc(SSL3_RT_MAX_PACKET_SIZE))
 460                         == NULL)
 461                         goto err;
 462                 s->s3->wbuf.buf=p;
 463                 }
 464         s->packet= &(s->s3->rbuf.buf[0]);
 465         return(1);
 466 err:
 467         SSLerr(SSL_F_SSL3_SETUP_BUFFERS,ERR_R_MALLOC_FAILURE);
 468         return(0);
 469         }