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,long *rl,int max);
  66 static void asn1_put_length(unsigned char **pp, int length);
  67 const char ASN1_version[]="ASN.1" OPENSSL_VERSION_PTEXT;
  68
  69 static int _asn1_check_infinite_end(const unsigned char **p, long len)
  70         {
  71         /* If there is 0 or 1 byte left, the length check should pick
  72          * things up */
  73         if (len <= 0)
  74                 return(1);
  75         else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0))
  76                 {
  77                 (*p)+=2;
  78                 return(1);
  79                 }
  80         return(0);
  81         }
  82
  83 int ASN1_check_infinite_end(unsigned char **p, long len)
  84         {
  85         return _asn1_check_infinite_end((const unsigned char **)p, len);
  86         }
  87
  88 int ASN1_const_check_infinite_end(const unsigned char **p, long len)
  89         {
  90         return _asn1_check_infinite_end(p, len);
  91         }
  92
  93
  94 int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
  95         int *pclass, long omax)
  96         {
  97         int i,ret;
  98         long l;
  99         const unsigned char *p= *pp;
 100         int tag,xclass,inf;
 101         long max=omax;
 102
 103         if (!max) goto err;
 104         ret=(*p&V_ASN1_CONSTRUCTED);
 105         xclass=(*p&V_ASN1_PRIVATE);
 106         i= *p&V_ASN1_PRIMITIVE_TAG;
 107         if (i == V_ASN1_PRIMITIVE_TAG)
 108                 {               /* high-tag */
 109                 p++;
 110                 if (--max == 0) goto err;
 111                 l=0;
 112                 while (*p&0x80)
 113                         {
 114                         l<<=7L;
 115                         l|= *(p++)&0x7f;
 116                         if (--max == 0) goto err;
 117                         if (l > (INT_MAX >> 7L)) goto err;
 118                         }
 119                 l<<=7L;
 120                 l|= *(p++)&0x7f;
 121                 tag=(int)l;
 122                 if (--max == 0) goto err;
 123                 }
 124         else
 125                 {
 126                 tag=i;
 127                 p++;
 128                 if (--max == 0) goto err;
 129                 }
 130         *ptag=tag;
 131         *pclass=xclass;
 132         if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err;
 133
 134         if (inf && !(ret & V_ASN1_CONSTRUCTED))
 135                 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, long *rl, int max)
 158         {
 159         const unsigned char *p= *pp;
 160         unsigned long ret=0;
 161         unsigned int i;
 162
 163         if (max-- < 1) return(0);
 164         if (*p == 0x80)
 165                 {
 166                 *inf=1;
 167                 ret=0;
 168                 p++;
 169                 }
 170         else
 171                 {
 172                 *inf=0;
 173                 i= *p&0x7f;
 174                 if (*(p++) & 0x80)
 175                         {
 176                         if (max < (int)i)
 177                                 return 0;
 178                         /* Skip leading zeroes */
 179                         while (i && *p == 0)
 180                                 {
 181                                 p++;
 182                                 i--;
 183                                 }
 184                         if (i > sizeof(long))
 185                                 return 0;
 186                         while (i-- > 0)
 187                                 {
 188                                 ret<<=8L;
 189                                 ret|= *(p++);
 190                                 }
 191                         }
 192                 else
 193                         ret=i;
 194                 }
 195         if (ret > LONG_MAX)
 196                 return 0;
 197         *pp=p;
 198         *rl=(long)ret;
 199         return(1);
 200         }
 201
 202 /* class 0 is constructed
 203  * constructed == 2 for indefinite length constructed */
 204 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
 205              int xclass)
 206         {
 207         unsigned char *p= *pp;
 208         int i, ttag;
 209
 210         i=(constructed)?V_ASN1_CONSTRUCTED:0;
 211         i|=(xclass&V_ASN1_PRIVATE);
 212         if (tag < 31)
 213                 *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
 214         else
 215                 {
 216                 *(p++)=i|V_ASN1_PRIMITIVE_TAG;
 217                 for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
 218                 ttag = i;
 219                 while(i-- > 0)
 220                         {
 221                         p[i] = tag & 0x7f;
 222                         if(i != (ttag - 1)) p[i] |= 0x80;
 223                         tag >>= 7;
 224                         }
 225                 p += ttag;
 226                 }
 227         if (constructed == 2)
 228                 *(p++)=0x80;
 229         else
 230                 asn1_put_length(&p,length);
 231         *pp=p;
 232         }
 233
 234 int ASN1_put_eoc(unsigned char **pp)
 235         {
 236         unsigned char *p = *pp;
 237         *p++ = 0;
 238         *p++ = 0;
 239         *pp = p;
 240         return 2;
 241         }
 242
 243 static void asn1_put_length(unsigned char **pp, int length)
 244         {
 245         unsigned char *p= *pp;
 246         int i,l;
 247         if (length <= 127)
 248                 *(p++)=(unsigned char)length;
 249         else
 250                 {
 251                 l=length;
 252                 for (i=0; l > 0; i++)
 253                         l>>=8;
 254                 *(p++)=i|0x80;
 255                 l=i;
 256                 while (i-- > 0)
 257                         {
 258                         p[i]=length&0xff;
 259                         length>>=8;
 260                         }
 261                 p+=l;
 262                 }
 263         *pp=p;
 264         }
 265
 266 int ASN1_object_size(int constructed, int length, int tag)
 267         {
 268         int ret;
 269
 270         ret=length;
 271         ret++;
 272         if (tag >= 31)
 273                 {
 274                 while (tag > 0)
 275                         {
 276                         tag>>=7;
 277                         ret++;
 278                         }
 279                 }
 280         if (constructed == 2)
 281                 return ret + 3;
 282         ret++;
 283         if (length > 127)
 284                 {
 285                 while (length > 0)
 286                         {
 287                         length>>=8;
 288                         ret++;
 289                         }
 290                 }
 291         return(ret);
 292         }
 293
 294 static int _asn1_Finish(ASN1_const_CTX *c)
 295         {
 296         if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
 297                 {
 298                 if (!ASN1_const_check_infinite_end(&c->p,c->slen))
 299                         {
 300                         c->error=ERR_R_MISSING_ASN1_EOS;
 301                         return(0);
 302                         }
 303                 }
 304         if (    ((c->slen != 0) && !(c->inf & 1)) ||
 305                 ((c->slen < 0) && (c->inf & 1)))
 306                 {
 307                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
 308                 return(0);
 309                 }
 310         return(1);
 311         }
 312
 313 int asn1_Finish(ASN1_CTX *c)
 314         {
 315         return _asn1_Finish((ASN1_const_CTX *)c);
 316         }
 317
 318 int asn1_const_Finish(ASN1_const_CTX *c)
 319         {
 320         return _asn1_Finish(c);
 321         }
 322
 323 int asn1_GetSequence(ASN1_const_CTX *c, long *length)
 324         {
 325         const unsigned char *q;
 326
 327         q=c->p;
 328         c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
 329                 *length);
 330         if (c->inf & 0x80)
 331                 {
 332                 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
 333                 return(0);
 334                 }
 335         if (c->tag != V_ASN1_SEQUENCE)
 336                 {
 337                 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
 338                 return(0);
 339                 }
 340         (*length)-=(c->p-q);
 341         if (c->max && (*length < 0))
 342                 {
 343                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
 344                 return(0);
 345                 }
 346         if (c->inf == (1|V_ASN1_CONSTRUCTED))
 347                 c->slen= *length+ *(c->pp)-c->p;
 348         c->eos=0;
 349         return(1);
 350         }
 351
 352 int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
 353         {
 354         if (str == NULL)
 355                 return 0;
 356         dst->type = str->type;
 357         if (!ASN1_STRING_set(dst,str->data,str->length))
 358                 return 0;
 359         dst->flags = str->flags;
 360         return 1;
 361         }
 362
 363 ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
 364         {
 365         ASN1_STRING *ret;
 366         if (!str)
 367                  return NULL;
 368         ret=ASN1_STRING_new();
 369         if (!ret)
 370                 return NULL;
 371         if (!ASN1_STRING_copy(ret,str))
 372                 {
 373                 ASN1_STRING_free(ret);
 374                 return NULL;
 375                 }
 376         return ret;
 377         }
 378
 379 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
 380         {
 381         unsigned char *c;
 382         const char *data=_data;
 383
 384         if (len < 0)
 385                 {
 386                 if (data == NULL)
 387                         return(0);
 388                 else
 389                         len=strlen(data);
 390                 }
 391         if ((str->length < len) || (str->data == NULL))
 392                 {
 393                 c=str->data;
 394                 if (c == NULL)
 395                         str->data=OPENSSL_malloc(len+1);
 396                 else
 397                         str->data=OPENSSL_realloc(c,len+1);
 398
 399                 if (str->data == NULL)
 400                         {
 401                         ASN1err(ASN1_F_ASN1_STRING_SET,ERR_R_MALLOC_FAILURE);
 402                         str->data=c;
 403                         return(0);
 404                         }
 405                 }
 406         str->length=len;
 407         if (data != NULL)
 408                 {
 409                 memcpy(str->data,data,len);
 410                 /* an allowance for strings :-) */
 411                 str->data[len]='\0';
 412                 }
 413         return(1);
 414         }
 415
 416 void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
 417         {
 418         if (str->data)
 419                 OPENSSL_free(str->data);
 420         str->data = data;
 421         str->length = len;
 422         }
 423
 424 ASN1_STRING *ASN1_STRING_new(void)
 425         {
 426         return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
 427         }
 428
 429
 430 ASN1_STRING *ASN1_STRING_type_new(int type)
 431         {
 432         ASN1_STRING *ret;
 433
 434         ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
 435         if (ret == NULL)
 436                 {
 437                 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
 438                 return(NULL);
 439                 }
 440         ret->length=0;
 441         ret->type=type;
 442         ret->data=NULL;
 443         ret->flags=0;
 444         return(ret);
 445         }
 446
 447 void ASN1_STRING_free(ASN1_STRING *a)
 448         {
 449         if (a == NULL) return;
 450         if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
 451                 OPENSSL_free(a->data);
 452         OPENSSL_free(a);
 453         }
 454
 455 int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
 456         {
 457         int i;
 458
 459         i=(a->length-b->length);
 460         if (i == 0)
 461                 {
 462                 i=memcmp(a->data,b->data,a->length);
 463                 if (i == 0)
 464                         return(a->type-b->type);
 465                 else
 466                         return(i);
 467                 }
 468         else
 469                 return(i);
 470         }
 471
 472 void asn1_add_error(const unsigned char *address, int offset)
 473         {
 474         char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];
 475
 476         BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address);
 477         BIO_snprintf(buf2,sizeof buf2,"%d",offset);
 478         ERR_add_error_data(4,"address=",buf1," offset=",buf2);
 479         }
 480
 481 int ASN1_STRING_length(const ASN1_STRING *x)
 482 { return M_ASN1_STRING_length(x); }
 483
 484 void ASN1_STRING_length_set(ASN1_STRING *x, int len)
 485 { M_ASN1_STRING_length_set(x, len); return; }
 486
 487 int ASN1_STRING_type(ASN1_STRING *x)
 488 { return M_ASN1_STRING_type(x); }
 489
 490 unsigned char * ASN1_STRING_data(ASN1_STRING *x)
 491 { return M_ASN1_STRING_data(x); }