crypto/openssl-0.9.7d/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         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) && (length == 0))
 209                 *(p++)=0x80; /* der_put_length would output 0 instead */
 210         else
 211                 asn1_put_length(&p,length);
 212         *pp=p;
 213         }
 214
 215 static void asn1_put_length(unsigned char **pp, int length)
 216         {
 217         unsigned char *p= *pp;
 218         int i,l;
 219         if (length <= 127)
 220                 *(p++)=(unsigned char)length;
 221         else
 222                 {
 223                 l=length;
 224                 for (i=0; l > 0; i++)
 225                         l>>=8;
 226                 *(p++)=i|0x80;
 227                 l=i;
 228                 while (i-- > 0)
 229                         {
 230                         p[i]=length&0xff;
 231                         length>>=8;
 232                         }
 233                 p+=l;
 234                 }
 235         *pp=p;
 236         }
 237
 238 int ASN1_object_size(int constructed, int length, int tag)
 239         {
 240         int ret;
 241
 242         ret=length;
 243         ret++;
 244         if (tag >= 31)
 245                 {
 246                 while (tag > 0)
 247                         {
 248                         tag>>=7;
 249                         ret++;
 250                         }
 251                 }
 252         if ((length == 0) && (constructed == 2))
 253                 ret+=2;
 254         ret++;
 255         if (length > 127)
 256                 {
 257                 while (length > 0)
 258                         {
 259                         length>>=8;
 260                         ret++;
 261                         }
 262                 }
 263         return(ret);
 264         }
 265
 266 int asn1_Finish(ASN1_CTX *c)
 267         {
 268         if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
 269                 {
 270                 if (!ASN1_check_infinite_end(&c->p,c->slen))
 271                         {
 272                         c->error=ERR_R_MISSING_ASN1_EOS;
 273                         return(0);
 274                         }
 275                 }
 276         if (    ((c->slen != 0) && !(c->inf & 1)) ||
 277                 ((c->slen < 0) && (c->inf & 1)))
 278                 {
 279                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
 280                 return(0);
 281                 }
 282         return(1);
 283         }
 284
 285 int asn1_GetSequence(ASN1_CTX *c, long *length)
 286         {
 287         unsigned char *q;
 288
 289         q=c->p;
 290         c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
 291                 *length);
 292         if (c->inf & 0x80)
 293                 {
 294                 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
 295                 return(0);
 296                 }
 297         if (c->tag != V_ASN1_SEQUENCE)
 298                 {
 299                 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
 300                 return(0);
 301                 }
 302         (*length)-=(c->p-q);
 303         if (c->max && (*length < 0))
 304                 {
 305                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
 306                 return(0);
 307                 }
 308         if (c->inf == (1|V_ASN1_CONSTRUCTED))
 309                 c->slen= *length+ *(c->pp)-c->p;
 310         c->eos=0;
 311         return(1);
 312         }
 313
 314 ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str)
 315         {
 316         ASN1_STRING *ret;
 317
 318         if (str == NULL) return(NULL);
 319         if ((ret=ASN1_STRING_type_new(str->type)) == NULL)
 320                 return(NULL);
 321         if (!ASN1_STRING_set(ret,str->data,str->length))
 322                 {
 323                 ASN1_STRING_free(ret);
 324                 return(NULL);
 325                 }
 326         ret->flags = str->flags;
 327         return(ret);
 328         }
 329
 330 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
 331         {
 332         unsigned char *c;
 333         const char *data=_data;
 334
 335         if (len < 0)
 336                 {
 337                 if (data == NULL)
 338                         return(0);
 339                 else
 340                         len=strlen(data);
 341                 }
 342         if ((str->length < len) || (str->data == NULL))
 343                 {
 344                 c=str->data;
 345                 if (c == NULL)
 346                         str->data=OPENSSL_malloc(len+1);
 347                 else
 348                         str->data=OPENSSL_realloc(c,len+1);
 349
 350                 if (str->data == NULL)
 351                         {
 352                         str->data=c;
 353                         return(0);
 354                         }
 355                 }
 356         str->length=len;
 357         if (data != NULL)
 358                 {
 359                 memcpy(str->data,data,len);
 360                 /* an allowance for strings :-) */
 361                 str->data[len]='\0';
 362                 }
 363         return(1);
 364         }
 365
 366 ASN1_STRING *ASN1_STRING_new(void)
 367         {
 368         return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
 369         }
 370
 371
 372 ASN1_STRING *ASN1_STRING_type_new(int type)
 373         {
 374         ASN1_STRING *ret;
 375
 376         ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
 377         if (ret == NULL)
 378                 {
 379                 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
 380                 return(NULL);
 381                 }
 382         ret->length=0;
 383         ret->type=type;
 384         ret->data=NULL;
 385         ret->flags=0;
 386         return(ret);
 387         }
 388
 389 void ASN1_STRING_free(ASN1_STRING *a)
 390         {
 391         if (a == NULL) return;
 392         if (a->data != NULL) OPENSSL_free(a->data);
 393         OPENSSL_free(a);
 394         }
 395
 396 int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b)
 397         {
 398         int i;
 399
 400         i=(a->length-b->length);
 401         if (i == 0)
 402                 {
 403                 i=memcmp(a->data,b->data,a->length);
 404                 if (i == 0)
 405                         return(a->type-b->type);
 406                 else
 407                         return(i);
 408                 }
 409         else
 410                 return(i);
 411         }
 412
 413 void asn1_add_error(unsigned char *address, int offset)
 414         {
 415         char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];
 416
 417         BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address);
 418         BIO_snprintf(buf2,sizeof buf2,"%d",offset);
 419         ERR_add_error_data(4,"address=",buf1," offset=",buf2);
 420         }
 421
 422 int ASN1_STRING_length(ASN1_STRING *x)
 423 { return M_ASN1_STRING_length(x); }
 424
 425 void ASN1_STRING_length_set(ASN1_STRING *x, int len)
 426 { M_ASN1_STRING_length_set(x, len); return; }
 427
 428 int ASN1_STRING_type(ASN1_STRING *x)
 429 { return M_ASN1_STRING_type(x); }
 430
 431 unsigned char * ASN1_STRING_data(ASN1_STRING *x)
 432 { return M_ASN1_STRING_data(x); }