crypto/asn1/asn1_lib.c

   1 /* crypto/asn1/asn1_lib.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 <limits.h>
  61 #include "cryptlib.h"
  62 #include <openssl/asn1.h>
  63 #include <openssl/asn1_mac.h>
  64
  65 static int asn1_get_length(const unsigned char **pp, int *inf, size_t *rl,
  66                            size_t max);
  67 static void asn1_put_length(unsigned char **pp, int length);
  68 const char ASN1_version[]="ASN.1" OPENSSL_VERSION_PTEXT;
  69
  70 static int _asn1_check_infinite_end(const unsigned char **p, long len)
  71         {
  72         /* If there is 0 or 1 byte left, the length check should pick
  73          * things up */
  74         if (len <= 0)
  75                 return(1);
  76         else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0))
  77                 {
  78                 (*p)+=2;
  79                 return(1);
  80                 }
  81         return(0);
  82         }
  83
  84 int ASN1_check_infinite_end(unsigned char **p, size_t len)
  85         {
  86         return _asn1_check_infinite_end((const unsigned char **)p, len);
  87         }
  88
  89 int ASN1_const_check_infinite_end(const unsigned char **p, size_t len)
  90         {
  91         return _asn1_check_infinite_end(p, len);
  92         }
  93
  94
  95 int ASN1_get_object(const unsigned char **pp, size_t *plength, int *ptag,
  96                     int *pclass, size_t omax)
  97         {
  98         int i,ret;
  99         long l;
 100         const unsigned char *p= *pp;
 101         int tag,xclass,inf;
 102         size_t max=omax;
 103
 104         if (!max)
 105             goto err;
 106
 107         ret=(*p&V_ASN1_CONSTRUCTED);
 108         xclass=(*p&V_ASN1_PRIVATE);
 109         i= *p&V_ASN1_PRIMITIVE_TAG;
 110         if (i == V_ASN1_PRIMITIVE_TAG)
 111                 {               /* high-tag */
 112                 p++;
 113                 if (--max == 0) goto err;
 114                 l=0;
 115                 while (*p&0x80)
 116                         {
 117                         l<<=7L;
 118                         l|= *(p++)&0x7f;
 119                         if (--max == 0) goto err;
 120                         if (l > (INT_MAX >> 7L)) goto err;
 121                         }
 122                 l<<=7L;
 123                 l|= *(p++)&0x7f;
 124                 tag=(int)l;
 125                 if (--max == 0) goto err;
 126                 }
 127         else
 128                 {
 129                 tag=i;
 130                 p++;
 131                 if (--max == 0) goto err;
 132                 }
 133         *ptag=tag;
 134         *pclass=xclass;
 135         if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err;
 136
 137 #if 0
 138         fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d  (%d > %d)\n",
 139                 (int)p,*plength,omax,(int)*pp,(int)(p+ *plength),
 140                 (int)(omax+ *pp));
 141
 142 #endif
 143         if (*plength > (omax - (p - *pp)))
 144                 {
 145                 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG);
 146                 /* Set this so that even if things are not long enough
 147                  * the values are set correctly */
 148                 ret|=0x80;
 149                 }
 150         *pp=p;
 151         return(ret|inf);
 152 err:
 153         ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
 154         return(0x80);
 155         }
 156
 157 static int asn1_get_length(const unsigned char **pp, int *inf, size_t *rl,
 158                            size_t max)
 159         {
 160         const unsigned char *p= *pp;
 161         unsigned long ret=0;
 162         unsigned int i;
 163
 164         if (max-- < 1) return(0);
 165         if (*p == 0x80)
 166                 {
 167                 *inf=1;
 168                 ret=0;
 169                 p++;
 170                 }
 171         else
 172                 {
 173                 *inf=0;
 174                 i= *p&0x7f;
 175                 if (*(p++) & 0x80)
 176                         {
 177                         if (i > sizeof(long))
 178                                 return 0;
 179                         if (max-- == 0) return(0);
 180                         while (i-- > 0)
 181                                 {
 182                                 ret<<=8L;
 183                                 ret|= *(p++);
 184                                 if (max-- == 0) return(0);
 185                                 }
 186                         }
 187                 else
 188                         ret=i;
 189                 }
 190         if (ret > LONG_MAX)
 191                 return 0;
 192         *pp=p;
 193         *rl=(long)ret;
 194         return(1);
 195         }
 196
 197 /* class 0 is constructed
 198  * constructed == 2 for indefinite length constructed */
 199 void ASN1_put_object(unsigned char **pp, int constructed, size_t length,
 200                      int tag, int xclass)
 201         {
 202         unsigned char *p= *pp;
 203         int i, ttag;
 204
 205         i=(constructed)?V_ASN1_CONSTRUCTED:0;
 206         i|=(xclass&V_ASN1_PRIVATE);
 207         if (tag < 31)
 208                 *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
 209         else
 210                 {
 211                 *(p++)=i|V_ASN1_PRIMITIVE_TAG;
 212                 for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
 213                 ttag = i;
 214                 while(i-- > 0)
 215                         {
 216                         p[i] = tag & 0x7f;
 217                         if(i != (ttag - 1)) p[i] |= 0x80;
 218                         tag >>= 7;
 219                         }
 220                 p += ttag;
 221                 }
 222         if (constructed == 2)
 223                 *(p++)=0x80;
 224         else
 225                 asn1_put_length(&p,length);
 226         *pp=p;
 227         }
 228
 229 int ASN1_put_eoc(unsigned char **pp)
 230         {
 231         unsigned char *p = *pp;
 232         *p++ = 0;
 233         *p++ = 0;
 234         *pp = p;
 235         return 2;
 236         }
 237
 238 static void asn1_put_length(unsigned char **pp, int length)
 239         {
 240         unsigned char *p= *pp;
 241         int i,l;
 242         if (length <= 127)
 243                 *(p++)=(unsigned char)length;
 244         else
 245                 {
 246                 l=length;
 247                 for (i=0; l > 0; i++)
 248                         l>>=8;
 249                 *(p++)=i|0x80;
 250                 l=i;
 251                 while (i-- > 0)
 252                         {
 253                         p[i]=length&0xff;
 254                         length>>=8;
 255                         }
 256                 p+=l;
 257                 }
 258         *pp=p;
 259         }
 260
 261 size_t ASN1_object_size(int constructed, size_t length, int tag)
 262         {
 263         int ret;
 264
 265         ret=length;
 266         ret++;
 267         if (tag >= 31)
 268                 {
 269                 while (tag > 0)
 270                         {
 271                         tag>>=7;
 272                         ret++;
 273                         }
 274                 }
 275         if (constructed == 2)
 276                 return ret + 3;
 277         ret++;
 278         if (length > 127)
 279                 {
 280                 while (length > 0)
 281                         {
 282                         length>>=8;
 283                         ret++;
 284                         }
 285                 }
 286         return(ret);
 287         }
 288
 289 static int _asn1_Finish(ASN1_const_CTX *c)
 290         {
 291         if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
 292                 {
 293                 if (!ASN1_const_check_infinite_end(&c->p,c->slen))
 294                         {
 295                         c->error=ERR_R_MISSING_ASN1_EOS;
 296                         return(0);
 297                         }
 298                 }
 299         if (    ((c->slen != 0) && !(c->inf & 1)) ||
 300                 ((c->slen < 0) && (c->inf & 1)))
 301                 {
 302                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
 303                 return(0);
 304                 }
 305         return(1);
 306         }
 307
 308 int asn1_Finish(ASN1_CTX *c)
 309         {
 310         return _asn1_Finish((ASN1_const_CTX *)c);
 311         }
 312
 313 int asn1_const_Finish(ASN1_const_CTX *c)
 314         {
 315         return _asn1_Finish(c);
 316         }
 317
 318 int asn1_GetSequence(ASN1_const_CTX *c, long *length)
 319         {
 320         const unsigned char *q;
 321
 322         q=c->p;
 323         c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
 324                 *length);
 325         if (c->inf & 0x80)
 326                 {
 327                 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
 328                 return(0);
 329                 }
 330         if (c->tag != V_ASN1_SEQUENCE)
 331                 {
 332                 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
 333                 return(0);
 334                 }
 335         (*length)-=(c->p-q);
 336         if (c->max && (*length < 0))
 337                 {
 338                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
 339                 return(0);
 340                 }
 341         if (c->inf == (1|V_ASN1_CONSTRUCTED))
 342                 c->slen= *length+ *(c->pp)-c->p;
 343         c->eos=0;
 344         return(1);
 345         }
 346
 347 int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
 348         {
 349         if (str == NULL)
 350                 return 0;
 351         dst->type = str->type;
 352         if (!ASN1_STRING_set(dst,str->data,str->length))
 353                 return 0;
 354         dst->flags = str->flags;
 355         return 1;
 356         }
 357
 358 ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
 359         {
 360         ASN1_STRING *ret;
 361         if (!str)
 362                  return NULL;
 363         ret=ASN1_STRING_new();
 364         if (!ret)
 365                 return NULL;
 366         if (!ASN1_STRING_copy(ret,str))
 367                 {
 368                 ASN1_STRING_free(ret);
 369                 return NULL;
 370                 }
 371         return ret;
 372         }
 373
 374 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, size_t len)
 375         {
 376         unsigned char *c;
 377         const char *data=_data;
 378
 379         if (len < 0)
 380                 {
 381                 if (data == NULL)
 382                         return(0);
 383                 else
 384                         len=strlen(data);
 385                 }
 386         if ((str->length < len) || (str->data == NULL))
 387                 {
 388                 c=str->data;
 389                 if (c == NULL)
 390                         str->data=OPENSSL_malloc(len+1);
 391                 else
 392                         str->data=OPENSSL_realloc(c,len+1);
 393
 394                 if (str->data == NULL)
 395                         {
 396                         ASN1err(ASN1_F_ASN1_STRING_SET,ERR_R_MALLOC_FAILURE);
 397                         str->data=c;
 398                         return(0);
 399                         }
 400                 }
 401         str->length=len;
 402         if (data != NULL)
 403                 {
 404                 memcpy(str->data,data,len);
 405                 /* an allowance for strings :-) */
 406                 str->data[len]='\0';
 407                 }
 408         return(1);
 409         }
 410
 411 void ASN1_STRING_set0(ASN1_STRING *str, void *data, size_t len)
 412         {
 413         if (str->data)
 414                 OPENSSL_free(str->data);
 415         str->data = data;
 416         str->length = len;
 417         }
 418
 419 ASN1_STRING *ASN1_STRING_new(void)
 420         {
 421         return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
 422         }
 423
 424
 425 ASN1_STRING *ASN1_STRING_type_new(int type)
 426         {
 427         ASN1_STRING *ret;
 428
 429         ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
 430         if (ret == NULL)
 431                 {
 432                 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
 433                 return(NULL);
 434                 }
 435         ret->length=0;
 436         ret->type=type;
 437         ret->data=NULL;
 438         ret->flags=0;
 439         return(ret);
 440         }
 441
 442 void ASN1_STRING_free(ASN1_STRING *a)
 443         {
 444         if (a == NULL) return;
 445         if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
 446                 OPENSSL_free(a->data);
 447         OPENSSL_free(a);
 448         }
 449
 450 int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
 451         {
 452         int i;
 453
 454         i=(a->length-b->length);
 455         if (i == 0)
 456                 {
 457                 i=memcmp(a->data,b->data,a->length);
 458                 if (i == 0)
 459                         return(a->type-b->type);
 460                 else
 461                         return(i);
 462                 }
 463         else
 464                 return(i);
 465         }
 466
 467 void asn1_add_error(const unsigned char *address, int offset)
 468         {
 469         char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];
 470
 471         BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address);
 472         BIO_snprintf(buf2,sizeof buf2,"%d",offset);
 473         ERR_add_error_data(4,"address=",buf1," offset=",buf2);
 474         }
 475
 476 size_t ASN1_STRING_length(const ASN1_STRING *x)
 477         { return M_ASN1_STRING_length(x); }
 478
 479 void ASN1_STRING_length_set(ASN1_STRING *x, size_t len)
 480         { M_ASN1_STRING_length_set(x, len); return; }
 481
 482 int ASN1_STRING_type(ASN1_STRING *x)
 483         { return M_ASN1_STRING_type(x); }
 484
 485 unsigned char * ASN1_STRING_data(ASN1_STRING *x)
 486         { return M_ASN1_STRING_data(x); }