crypto/openssl/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 (i > sizeof(long))
 177                                 return 0;
 178                         if (max-- == 0) return(0);
 179                         while (i-- > 0)
 180                                 {
 181                                 ret<<=8L;
 182                                 ret|= *(p++);
 183                                 if (max-- == 0) return(0);
 184                                 }
 185                         }
 186                 else
 187                         ret=i;
 188                 }
 189         if (ret > LONG_MAX)
 190                 return 0;
 191         *pp=p;
 192         *rl=(long)ret;
 193         return(1);
 194         }
 195
 196 /* class 0 is constructed
 197  * constructed == 2 for indefinite length constructed */
 198 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
 199              int xclass)
 200         {
 201         unsigned char *p= *pp;
 202         int i, ttag;
 203
 204         i=(constructed)?V_ASN1_CONSTRUCTED:0;
 205         i|=(xclass&V_ASN1_PRIVATE);
 206         if (tag < 31)
 207                 *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
 208         else
 209                 {
 210                 *(p++)=i|V_ASN1_PRIMITIVE_TAG;
 211                 for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
 212                 ttag = i;
 213                 while(i-- > 0)
 214                         {
 215                         p[i] = tag & 0x7f;
 216                         if(i != (ttag - 1)) p[i] |= 0x80;
 217                         tag >>= 7;
 218                         }
 219                 p += ttag;
 220                 }
 221         if (constructed == 2)
 222                 *(p++)=0x80;
 223         else
 224                 asn1_put_length(&p,length);
 225         *pp=p;
 226         }
 227
 228 int ASN1_put_eoc(unsigned char **pp)
 229         {
 230         unsigned char *p = *pp;
 231         *p++ = 0;
 232         *p++ = 0;
 233         *pp = p;
 234         return 2;
 235         }
 236
 237 static void asn1_put_length(unsigned char **pp, int length)
 238         {
 239         unsigned char *p= *pp;
 240         int i,l;
 241         if (length <= 127)
 242                 *(p++)=(unsigned char)length;
 243         else
 244                 {
 245                 l=length;
 246                 for (i=0; l > 0; i++)
 247                         l>>=8;
 248                 *(p++)=i|0x80;
 249                 l=i;
 250                 while (i-- > 0)
 251                         {
 252                         p[i]=length&0xff;
 253                         length>>=8;
 254                         }
 255                 p+=l;
 256                 }
 257         *pp=p;
 258         }
 259
 260 int ASN1_object_size(int constructed, int length, int tag)
 261         {
 262         int ret;
 263
 264         ret=length;
 265         ret++;
 266         if (tag >= 31)
 267                 {
 268                 while (tag > 0)
 269                         {
 270                         tag>>=7;
 271                         ret++;
 272                         }
 273                 }
 274         if (constructed == 2)
 275                 return ret + 3;
 276         ret++;
 277         if (length > 127)
 278                 {
 279                 while (length > 0)
 280                         {
 281                         length>>=8;
 282                         ret++;
 283                         }
 284                 }
 285         return(ret);
 286         }
 287
 288 static int _asn1_Finish(ASN1_const_CTX *c)
 289         {
 290         if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
 291                 {
 292                 if (!ASN1_const_check_infinite_end(&c->p,c->slen))
 293                         {
 294                         c->error=ERR_R_MISSING_ASN1_EOS;
 295                         return(0);
 296                         }
 297                 }
 298         if (    ((c->slen != 0) && !(c->inf & 1)) ||
 299                 ((c->slen < 0) && (c->inf & 1)))
 300                 {
 301                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
 302                 return(0);
 303                 }
 304         return(1);
 305         }
 306
 307 int asn1_Finish(ASN1_CTX *c)
 308         {
 309         return _asn1_Finish((ASN1_const_CTX *)c);
 310         }
 311
 312 int asn1_const_Finish(ASN1_const_CTX *c)
 313         {
 314         return _asn1_Finish(c);
 315         }
 316
 317 int asn1_GetSequence(ASN1_const_CTX *c, long *length)
 318         {
 319         const unsigned char *q;
 320
 321         q=c->p;
 322         c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
 323                 *length);
 324         if (c->inf & 0x80)
 325                 {
 326                 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
 327                 return(0);
 328                 }
 329         if (c->tag != V_ASN1_SEQUENCE)
 330                 {
 331                 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
 332                 return(0);
 333                 }
 334         (*length)-=(c->p-q);
 335         if (c->max && (*length < 0))
 336                 {
 337                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
 338                 return(0);
 339                 }
 340         if (c->inf == (1|V_ASN1_CONSTRUCTED))
 341                 c->slen= *length+ *(c->pp)-c->p;
 342         c->eos=0;
 343         return(1);
 344         }
 345
 346 ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str)
 347         {
 348         ASN1_STRING *ret;
 349
 350         if (str == NULL) return(NULL);
 351         if ((ret=ASN1_STRING_type_new(str->type)) == NULL)
 352                 return(NULL);
 353         if (!ASN1_STRING_set(ret,str->data,str->length))
 354                 {
 355                 ASN1_STRING_free(ret);
 356                 return(NULL);
 357                 }
 358         ret->flags = str->flags;
 359         return(ret);
 360         }
 361
 362 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
 363         {
 364         unsigned char *c;
 365         const char *data=_data;
 366
 367         if (len < 0)
 368                 {
 369                 if (data == NULL)
 370                         return(0);
 371                 else
 372                         len=strlen(data);
 373                 }
 374         if ((str->length < len) || (str->data == NULL))
 375                 {
 376                 c=str->data;
 377                 if (c == NULL)
 378                         str->data=OPENSSL_malloc(len+1);
 379                 else
 380                         str->data=OPENSSL_realloc(c,len+1);
 381
 382                 if (str->data == NULL)
 383                         {
 384                         ASN1err(ASN1_F_ASN1_STRING_SET,ERR_R_MALLOC_FAILURE);
 385                         str->data=c;
 386                         return(0);
 387                         }
 388                 }
 389         str->length=len;
 390         if (data != NULL)
 391                 {
 392                 memcpy(str->data,data,len);
 393                 /* an allowance for strings :-) */
 394                 str->data[len]='\0';
 395                 }
 396         return(1);
 397         }
 398
 399 void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
 400         {
 401         if (str->data)
 402                 OPENSSL_free(str->data);
 403         str->data = data;
 404         str->length = len;
 405         }
 406
 407 ASN1_STRING *ASN1_STRING_new(void)
 408         {
 409         return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
 410         }
 411
 412
 413 ASN1_STRING *ASN1_STRING_type_new(int type)
 414         {
 415         ASN1_STRING *ret;
 416
 417         ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
 418         if (ret == NULL)
 419                 {
 420                 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
 421                 return(NULL);
 422                 }
 423         ret->length=0;
 424         ret->type=type;
 425         ret->data=NULL;
 426         ret->flags=0;
 427         return(ret);
 428         }
 429
 430 void ASN1_STRING_free(ASN1_STRING *a)
 431         {
 432         if (a == NULL) return;
 433         if (a->data != NULL) OPENSSL_free(a->data);
 434         OPENSSL_free(a);
 435         }
 436
 437 int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b)
 438         {
 439         int i;
 440
 441         i=(a->length-b->length);
 442         if (i == 0)
 443                 {
 444                 i=memcmp(a->data,b->data,a->length);
 445                 if (i == 0)
 446                         return(a->type-b->type);
 447                 else
 448                         return(i);
 449                 }
 450         else
 451                 return(i);
 452         }
 453
 454 void asn1_add_error(const unsigned char *address, int offset)
 455         {
 456         char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];
 457
 458         BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address);
 459         BIO_snprintf(buf2,sizeof buf2,"%d",offset);
 460         ERR_add_error_data(4,"address=",buf1," offset=",buf2);
 461         }
 462
 463 int ASN1_STRING_length(ASN1_STRING *x)
 464 { return M_ASN1_STRING_length(x); }
 465
 466 void ASN1_STRING_length_set(ASN1_STRING *x, int len)
 467 { M_ASN1_STRING_length_set(x, len); return; }
 468
 469 int ASN1_STRING_type(ASN1_STRING *x)
 470 { return M_ASN1_STRING_type(x); }
 471
 472 unsigned char * ASN1_STRING_data(ASN1_STRING *x)
 473 { return M_ASN1_STRING_data(x); }