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