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