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