asn1/element.c

   1 /*
   2  *      Copyright (C) 2000,2001,2002,2003 Fabio Fiorina
   3  *
   4  * This file is part of LIBASN1.
   5  *
   6  * The LIBTASN1 library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
  19  */
  20
  21 /*****************************************************/
  22 /* File: element.c                                   */
  23 /* Description: Functions with the read and write    */
  24 /*   functions.                                      */
  25 /*****************************************************/
  26
  27
  28 #include <int.h>
  29 #include <errors.h>
  30 #include "parser_aux.h"
  31 #include "der.h"
  32 #include <gstr.h>
  33 #include "structure.h"
  34
  35 void
  36 _asn1_hierarchical_name(node_asn *node,char *name,int name_size)
  37 {
  38   node_asn *p;
  39   char tmp_name[64];
  40
  41   p=node;
  42
  43   name[0]=0;
  44
  45   while(p != NULL){
  46     if(p->name != NULL){
  47       _asn1_str_cpy(tmp_name,sizeof(tmp_name),name),
  48
  49       _asn1_str_cpy(name,name_size,p->name);
  50       _asn1_str_cat(name,name_size,".");
  51       _asn1_str_cat(name,name_size,tmp_name);
  52     }
  53     p=_asn1_find_up(p);
  54   }
  55
  56   if(name[0]==0) _asn1_str_cpy(name,name_size,"ROOT");
  57 }
  58
  59
  60 /******************************************************************/
  61 /* Function : _asn1_convert_integer                               */
  62 /* Description: converts an integer from a null terminated string */
  63 /*              to der decoding. The convertion from a null       */
  64 /*              terminated string to an integer is made with      */
  65 /*              the 'strtol' function.                            */
  66 /* Parameters:                                                    */
  67 /*   value: null terminated string to convert.                    */
  68 /*   value_out: convertion result (memory must be already         */
  69 /*              allocated).                                       */
  70 /*   value_out_size: number of bytes of value_out.                */
  71 /*   len: number of significant byte of value_out.                */
  72 /* Return: ASN1_MEM_ERROR or ASN1_SUCCESS                         */
  73 /******************************************************************/
  74 asn1_retCode
  75 _asn1_convert_integer(const char *value,unsigned char *value_out,int value_out_size, int *len)
  76 {
  77   char negative;
  78   unsigned char val[SIZEOF_UNSIGNED_LONG_INT];
  79   long valtmp;
  80   int k,k2;
  81
  82   valtmp=strtol(value,NULL,10);
  83
  84   for(k=0;k<SIZEOF_UNSIGNED_LONG_INT;k++){
  85     val[SIZEOF_UNSIGNED_LONG_INT-k-1]=(valtmp >> (8*k)) & 0xFF;
  86   }
  87
  88   if(val[0]&0x80) negative=1;
  89   else negative=0;
  90
  91   for(k=0;k<SIZEOF_UNSIGNED_LONG_INT-1;k++){
  92     if(negative && (val[k]!=0xFF)) break;
  93     else if(!negative && val[k]) break;
  94   }
  95
  96   if((negative && !(val[k]&0x80)) ||
  97      (!negative && (val[k]&0x80))) k--;
  98
  99   *len=SIZEOF_UNSIGNED_LONG_INT-k;
 100
 101   if (SIZEOF_UNSIGNED_LONG_INT-k> value_out_size)
 102     /* VALUE_OUT is too short to contain the value convertion */
 103     return ASN1_MEM_ERROR;
 104
 105   for(k2=k;k2<SIZEOF_UNSIGNED_LONG_INT;k2++)
 106     value_out[k2-k]=val[k2];
 107
 108
 109 #ifdef LIBTASN1_DEBUG_INTEGER
 110   _libtasn1_log("_asn1_convert_integer: valueIn=%s, lenOut=%d",value,*len);
 111   for(k=0;k<SIZEOF_UNSIGNED_LONG_INT;k++)
 112     _libtasn1_log(", vOut[%d]=%d",k,value_out[k]);
 113   _libtasn1_log("\n");
 114 #endif
 115
 116
 117   return ASN1_SUCCESS;
 118 }
 119
 120
 121 int
 122 _asn1_append_sequence_set(node_asn *node)
 123 {
 124   node_asn *p,*p2;
 125   char temp[10];
 126   long n;
 127
 128   if(!node || !(node->down)) return ASN1_GENERIC_ERROR;
 129
 130   p=node->down;
 131   while((type_field(p->type)==TYPE_TAG) || (type_field(p->type)==TYPE_SIZE)) p=p->right;
 132   p2=_asn1_copy_structure3(p);
 133   while(p->right) p=p->right;
 134   _asn1_set_right(p,p2);
 135
 136   if(p->name==NULL) _asn1_str_cpy(temp,sizeof(temp),"?1");
 137   else{
 138     n=strtol(p->name+1,NULL,0);
 139     n++;
 140     temp[0]='?';
 141     _asn1_ltostr(n,temp+1);
 142   }
 143   _asn1_set_name(p2,temp);
 144   /*  p2->type |= CONST_OPTION; */
 145
 146   return ASN1_SUCCESS;
 147 }
 148
 149
 150 /**
 151   * asn1_write_value - Set the value of one element inside a structure.
 152   * @node_root: pointer to a structure
 153   * @name: the name of the element inside the structure that you want to set.
 154   * @value: vector used to specify the value to set. If len is >0,
 155   * VALUE must be a two's complement form integer.
 156   * if len=0 *VALUE must be a null terminated string with an integer value.
 157   * @len: number of bytes of *value to use to set the value: value[0]..value[len-1]
 158   *  or 0 if value is a null terminated string
 159   * Description:
 160   *
 161   * Set the value of one element inside a structure.
 162   *
 163   * Returns:
 164   *
 165   *   ASN1_SUCCESS\: set value OK
 166   *
 167   *   ASN1_ELEMENT_NOT_FOUND\: NAME is not a valid element.
 168   *
 169   *   ASN1_VALUE_NOT_VALID\: VALUE has a wrong format.
 170   *
 171   * Examples:
 172   *   description for each type
 173   *
 174   *\begin{itemize}
 175   * \item INTEGER\: VALUE must contain a two's complement form integer.
 176   *            value[0]=0xFF ,               len=1 -> integer=-1
 177   *            value[0]=0xFF value[1]=0xFF , len=2 -> integer=-1
 178   *            value[0]=0x01 ,               len=1 -> integer= 1
 179   *            value[0]=0x00 value[1]=0x01 , len=2 -> integer= 1
 180   *            value="123"                 , len=0 -> integer= 123
 181   *
 182   * \item ENUMERATED\: as INTEGER (but only with not negative numbers)
 183   *
 184   * \item BOOLEAN\: VALUE must be the null terminated string "TRUE" or "FALSE" and LEN != 0
 185   *            value="TRUE" , len=1 -> boolean=TRUE
 186   *            value="FALSE" , len=1 -> boolean=FALSE
 187   *
 188   * \item OBJECT IDENTIFIER\: VALUE must be a null terminated string with each number separated by
 189   *                      a dot (e.g. "1.2.3.543.1").
 190   *                      LEN != 0
 191   *            value="1 2 840 10040 4 3" , len=1 -> OID=dsa-with-sha
 192   *
 193   * \item UTCTime\: VALUE must be a null terminated string in one of these formats\:
 194   *            "YYMMDDhhmmssZ" "YYMMDDhhmmssZ" "YYMMDDhhmmss+hh'mm'" "YYMMDDhhmmss-hh'mm'"
 195   *            "YYMMDDhhmm+hh'mm'" "YYMMDDhhmm-hh'mm'".
 196   *            LEN != 0
 197   *            value="9801011200Z" , len=1 -> time=Jannuary 1st, 1998 at 12h 00m  Greenwich Mean Time
 198   *
 199   * \item GeneralizedTime\: VALUE must be in one of this format\:
 200   *                    "YYYYMMDDhhmmss.sZ" "YYYYMMDDhhmmss.sZ" "YYYYMMDDhhmmss.s+hh'mm'"
 201   *                    "YYYYMMDDhhmmss.s-hh'mm'" "YYYYMMDDhhmm+hh'mm'" "YYYYMMDDhhmm-hh'mm'"
 202   *                    where ss.s indicates the seconds with any precision like "10.1" or "01.02".
 203   *                    LEN != 0
 204   *            value="2001010112001.12-0700" , len=1 -> time=Jannuary 1st, 2001 at 12h 00m 01.12s
 205   *                                                     Pacific Daylight Time
 206   *
 207   * \item OCTET STRING\: VALUE contains the octet string and LEN is the number of octet.
 208   *            value="$\backslash$x01$\backslash$x02$\backslash$x03" , len=3  -> three bytes octet string
 209   *
 210   * \item GeneralString\: VALUE contains the generalstring and LEN is the number of octet.
 211   *            value="$\backslash$x01$\backslash$x02$\backslash$x03" , len=3  -> three bytes generalstring
 212   *
 213   * \item BIT STRING\: VALUE contains the bit string organized by bytes and LEN is the number of bits.
 214   *            value="$\backslash$xCF" , len=6 -> bit string="110011" (six bits)
 215   *
 216   * \item CHOICE\: if NAME indicates a choice type, VALUE must specify one of the alternatives with a
 217   *           null terminated string. LEN != 0
 218   *           Using "pkix.asn"\:
 219   *           result=asn1_write_value(cert,"certificate1.tbsCertificate.subject","rdnSequence",1);
 220   *
 221   * \item ANY\: VALUE indicates the der encoding of a structure.
 222   *        LEN != 0
 223   *
 224   * \item SEQUENCE OF\: VALUE must be the null terminated string "NEW" and LEN != 0. With this
 225   *                instruction another element is appended in the sequence. The name of this
 226   *                element will be "?1" if it's the first one, "?2" for the second and so on.
 227   *
 228   *           Using "pkix.asn"\:
 229   *
 230   *           result=asn1_write_value(cert,"certificate1.tbsCertificate.subject.rdnSequence","NEW",1);
 231   *
 232   * \item SET OF\: the same as SEQUENCE OF.
 233   *           Using "pkix.asn":
 234   *
 235   *           result=asn1_write_value(cert,"tbsCertificate.subject.rdnSequence.?LAST","NEW",1);
 236   *\end{itemize}
 237   *
 238   * If an element is OPTIONAL and you want to delete it, you must use the value=NULL and len=0.
 239   *
 240   *           Using "pkix.asn"\:
 241   *
 242   *           result=asn1_write_value(cert,"tbsCertificate.issuerUniqueID",NULL,0);
 243   *
 244   **/
 245 asn1_retCode
 246 asn1_write_value(node_asn *node_root,const char *name,
 247                  const unsigned char *value,int len)
 248 {
 249   node_asn *node,*p,*p2;
 250   unsigned char *temp,*value_temp=NULL,*default_temp=NULL;
 251   int len2,k,k2,negative;
 252
 253   node=_asn1_find_node(node_root,name);
 254   if(node==NULL) return  ASN1_ELEMENT_NOT_FOUND;
 255
 256   if((node->type & CONST_OPTION) && (value==NULL) && (len==0)){
 257     asn1_delete_structure(&node);
 258     return ASN1_SUCCESS;
 259   }
 260
 261   if((type_field(node->type) == TYPE_SEQUENCE_OF) && (value == NULL) && (len==0)){
 262     p=node->down;
 263     while((type_field(p->type)==TYPE_TAG) || (type_field(p->type)==TYPE_SIZE)) p=p->right;
 264
 265     while(p->right)
 266       asn1_delete_structure(&p->right);
 267
 268     return ASN1_SUCCESS;
 269   }
 270
 271   switch(type_field(node->type)){
 272   case TYPE_BOOLEAN:
 273     if(!strcmp(value,"TRUE")){
 274       if(node->type&CONST_DEFAULT){
 275         p=node->down;
 276         while(type_field(p->type)!=TYPE_DEFAULT) p=p->right;
 277         if(p->type&CONST_TRUE) _asn1_set_value(node,NULL,0);
 278         else _asn1_set_value(node,"T",1);
 279       }
 280       else _asn1_set_value(node,"T",1);
 281     }
 282     else if(!strcmp(value,"FALSE")){
 283       if(node->type&CONST_DEFAULT){
 284         p=node->down;
 285         while(type_field(p->type)!=TYPE_DEFAULT) p=p->right;
 286         if(p->type&CONST_FALSE) _asn1_set_value(node,NULL,0);
 287         else _asn1_set_value(node,"F",1);
 288       }
 289       else _asn1_set_value(node,"F",1);
 290     }
 291     else return ASN1_VALUE_NOT_VALID;
 292     break;
 293   case TYPE_INTEGER: case TYPE_ENUMERATED:
 294     if(len==0){
 295       if((isdigit(value[0])) || (value[0]=='-')){
 296         value_temp=(unsigned char *)_asn1_alloca(SIZEOF_UNSIGNED_LONG_INT);
 297         if (value_temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 298
 299         _asn1_convert_integer(value,value_temp,SIZEOF_UNSIGNED_LONG_INT, &len);
 300       }
 301       else{ /* is an identifier like v1 */
 302         if(!(node->type&CONST_LIST)) return ASN1_VALUE_NOT_VALID;
 303         p=node->down;
 304         while(p){
 305           if(type_field(p->type)==TYPE_CONSTANT){
 306             if((p->name) && (!strcmp(p->name,value))){
 307               value_temp=(unsigned char *)_asn1_alloca(SIZEOF_UNSIGNED_LONG_INT);
 308               if (value_temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 309
 310               _asn1_convert_integer(p->value,value_temp,SIZEOF_UNSIGNED_LONG_INT, &len);
 311               break;
 312             }
 313           }
 314           p=p->right;
 315         }
 316         if(p==NULL) return ASN1_VALUE_NOT_VALID;
 317       }
 318     }
 319     else{ /* len != 0 */
 320       value_temp=(unsigned char *)_asn1_alloca(len);
 321       if (value_temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 322       memcpy(value_temp,value,len);
 323     }
 324
 325
 326     if(value_temp[0]&0x80) negative=1;
 327     else negative=0;
 328
 329     if(negative && (type_field(node->type)==TYPE_ENUMERATED))
 330       {_asn1_afree(value_temp);return ASN1_VALUE_NOT_VALID;}
 331
 332     for(k=0;k<len-1;k++)
 333       if(negative && (value_temp[k]!=0xFF)) break;
 334       else if(!negative && value_temp[k]) break;
 335
 336     if((negative && !(value_temp[k]&0x80)) ||
 337        (!negative && (value_temp[k]&0x80))) k--;
 338
 339     _asn1_length_der(len-k,NULL,&len2);
 340     temp=(unsigned char *)_asn1_alloca(len-k+len2);
 341     if (temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 342
 343     _asn1_octet_der(value_temp+k,len-k,temp,&len2);
 344     _asn1_set_value(node,temp,len2);
 345
 346     _asn1_afree(temp);
 347
 348
 349     if(node->type&CONST_DEFAULT){
 350       p=node->down;
 351       while(type_field(p->type)!=TYPE_DEFAULT) p=p->right;
 352       if((isdigit(p->value[0])) || (p->value[0]=='-')){
 353         default_temp=(unsigned char *)_asn1_alloca(SIZEOF_UNSIGNED_LONG_INT);
 354         if (default_temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 355
 356         _asn1_convert_integer(p->value,default_temp,SIZEOF_UNSIGNED_LONG_INT,&len2);
 357       }
 358       else{ /* is an identifier like v1 */
 359         if(!(node->type&CONST_LIST)) return ASN1_VALUE_NOT_VALID;
 360         p2=node->down;
 361         while(p2){
 362           if(type_field(p2->type)==TYPE_CONSTANT){
 363             if((p2->name) && (!strcmp(p2->name,p->value))){
 364               default_temp=(unsigned char *)_asn1_alloca(SIZEOF_UNSIGNED_LONG_INT);
 365               if (default_temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 366
 367               _asn1_convert_integer(p2->value,default_temp,SIZEOF_UNSIGNED_LONG_INT,&len2);
 368               break;
 369             }
 370           }
 371           p2=p2->right;
 372         }
 373         if(p2==NULL) return ASN1_VALUE_NOT_VALID;
 374       }
 375
 376
 377       if((len-k)==len2){
 378         for(k2=0;k2<len2;k2++)
 379           if(value_temp[k+k2]!=default_temp[k2]){
 380             break;
 381           }
 382         if(k2==len2) _asn1_set_value(node,NULL,0);
 383       }
 384       _asn1_afree(default_temp);
 385     }
 386     _asn1_afree(value_temp);
 387     break;
 388   case TYPE_OBJECT_ID:
 389     for(k=0;k<strlen(value);k++)
 390       if((!isdigit(value[k])) && (value[k]!='.') && (value[k]!='+'))
 391         return ASN1_VALUE_NOT_VALID;
 392     if(node->type&CONST_DEFAULT){
 393       p=node->down;
 394       while(type_field(p->type)!=TYPE_DEFAULT) p=p->right;
 395       if(!strcmp(value,p->value)){
 396         _asn1_set_value(node,NULL,0);
 397         break;
 398       }
 399     }
 400     _asn1_set_value(node,value,strlen(value)+1);
 401     break;
 402   case TYPE_TIME:
 403     if(node->type&CONST_UTC){
 404       if(strlen(value)<11) return ASN1_VALUE_NOT_VALID;
 405       for(k=0;k<10;k++)
 406         if(!isdigit(value[k])) return ASN1_VALUE_NOT_VALID;
 407       switch(strlen(value)){
 408       case 11:
 409       if(value[10]!='Z') return ASN1_VALUE_NOT_VALID;
 410       break;
 411       case 13:
 412         if((!isdigit(value[10])) || (!isdigit(value[11])) ||
 413            (value[12]!='Z')) return ASN1_VALUE_NOT_VALID;
 414         break;
 415       case 15:
 416         if((value[10]!='+') && (value[10]!='-')) return ASN1_VALUE_NOT_VALID;
 417         for(k=11;k<15;k++)
 418           if(!isdigit(value[k])) return ASN1_VALUE_NOT_VALID;
 419         break;
 420       case 17:
 421         if((!isdigit(value[10])) || (!isdigit(value[11])))
 422            return ASN1_VALUE_NOT_VALID;
 423         if((value[12]!='+') && (value[12]!='-')) return ASN1_VALUE_NOT_VALID;
 424         for(k=13;k<17;k++)
 425           if(!isdigit(value[k])) return ASN1_VALUE_NOT_VALID;
 426         break;
 427       default:
 428         return ASN1_VALUE_NOT_FOUND;
 429       }
 430       _asn1_set_value(node,value,strlen(value)+1);
 431     }
 432     else{  /* GENERALIZED TIME */
 433       if(value) _asn1_set_value(node,value,strlen(value)+1);
 434     }
 435     break;
 436   case  TYPE_OCTET_STRING:
 437     if(len==0)
 438       len=strlen(value);
 439     _asn1_length_der(len,NULL,&len2);
 440     temp=(unsigned char *)_asn1_alloca(len+len2);
 441     if (temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 442
 443     _asn1_octet_der(value,len,temp,&len2);
 444     _asn1_set_value(node,temp,len2);
 445     _asn1_afree(temp);
 446     break;
 447   case  TYPE_GENERALSTRING:
 448     if(len==0)
 449       len=strlen(value);
 450     _asn1_length_der(len,NULL,&len2);
 451     temp=(unsigned char *)_asn1_alloca(len+len2);
 452     if (temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 453
 454     _asn1_octet_der(value,len,temp,&len2);
 455     _asn1_set_value(node,temp,len2);
 456     _asn1_afree(temp);
 457     break;
 458   case  TYPE_BIT_STRING:
 459     if(len==0)
 460       len=strlen(value);
 461     _asn1_length_der((len>>3)+2,NULL,&len2);
 462     temp=(unsigned char *)_asn1_alloca((len>>3)+2+len2);
 463     if (temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 464
 465     _asn1_bit_der(value,len,temp,&len2);
 466     _asn1_set_value(node,temp,len2);
 467     _asn1_afree(temp);
 468     break;
 469   case  TYPE_CHOICE:
 470     p=node->down;
 471     while(p){
 472       if(!strcmp(p->name,value)){
 473         p2=node->down;
 474         while(p2){
 475           if(p2!=p){asn1_delete_structure(&p2); p2=node->down;}
 476           else p2=p2->right;
 477         }
 478         break;
 479       }
 480       p=p->right;
 481     }
 482     if(!p) return ASN1_ELEMENT_NOT_FOUND;
 483     break;
 484   case TYPE_ANY:
 485     _asn1_length_der(len,NULL,&len2);
 486     temp=(unsigned char *)_asn1_alloca(len+len2);
 487     if (temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 488
 489     _asn1_octet_der(value,len,temp,&len2);
 490     _asn1_set_value(node,temp,len2);
 491     _asn1_afree(temp);
 492     break;
 493   case TYPE_SEQUENCE_OF: case TYPE_SET_OF:
 494     if(strcmp(value,"NEW")) return ASN1_VALUE_NOT_VALID;
 495     _asn1_append_sequence_set(node);
 496     break;
 497   default:
 498     return  ASN1_ELEMENT_NOT_FOUND;
 499     break;
 500   }
 501
 502   return ASN1_SUCCESS;
 503 }
 504
 505
 506 #define PUT_VALUE( ptr, ptr_size, data, data_size) \
 507         *len = data_size; \
 508         if (ptr_size < data_size) { \
 509                 return ASN1_MEM_ERROR; \
 510         } else { \
 511                 memcpy( ptr, data, data_size); \
 512         }
 513
 514 #define PUT_STR_VALUE( ptr, ptr_size, data) \
 515         *len = strlen(data) + 1; \
 516         if (ptr_size < *len) { \
 517                 return ASN1_MEM_ERROR; \
 518         } else { \
 519                 /* this strcpy is checked */ \
 520                 strcpy(ptr, data); \
 521         }
 522
 523 #define ADD_STR_VALUE( ptr, ptr_size, data) \
 524         *len = strlen(data) + 1; \
 525         if (ptr_size < strlen(ptr)+(*len)) { \
 526                 return ASN1_MEM_ERROR; \
 527         } else { \
 528                 /* this strcat is checked */ \
 529                 strcat(ptr, data); \
 530         }
 531
 532 /**
 533   * asn1_read_value - Returns the value of one element inside a structure
 534   * @root: pointer to a structure
 535   * @name: the name of the element inside a structure that you want to read.
 536   * @value: vector that will contain the element's content.
 537   * VALUE must be a pointer to memory cells already allocated.
 538   * @len: number of bytes of *value: value[0]..value[len-1]. Initialy holds the sizeof value.
 539   *
 540   * Description:
 541   *
 542   * Returns the value of one element inside a structure.
 543   *
 544   * Returns:
 545   *
 546   *   ASN1_SUCCESS\: set value OK
 547   *
 548   *   ASN1_ELEMENT_NOT_FOUND\: NAME is not a valid element.
 549   *
 550   *   ASN1_VALUE_NOT_FOUND\: there isn't any value for the element selected.
 551   *
 552   *   ASN1_MEM_ERROR\: the value vector isn't big enough to store the result.
 553   *   In this case LEN will contain the number of bytes needed.
 554   *
 555   * Examples:
 556   *   a description for each type
 557   *
 558   *\begin{itemize}
 559   * \item INTEGER\: VALUE will contain a two's complement form integer.
 560   *            integer=-1  -> value[0]=0xFF , len=1
 561   *            integer=1   -> value[0]=0x01 , len=1
 562   *
 563   * \item ENUMERATED\: as INTEGER (but only with not negative numbers)
 564   *
 565   * \item BOOLEAN\: VALUE will be the null terminated string "TRUE" or "FALSE" and LEN=5 or LEN=6
 566   *
 567   * \item OBJECT IDENTIFIER\: VALUE will be a null terminated string with each number separated by
 568   *                      a dot (i.e. "1.2.3.543.1").
 569   *                      LEN = strlen(VALUE)+1
 570   *
 571   * \item UTCTime\: VALUE will be a null terminated string in one of these formats\:
 572   *            "YYMMDDhhmmss+hh'mm'" or "YYMMDDhhmmss-hh'mm'"
 573   *            LEN=strlen(VALUE)+1
 574   *
 575   * \item GeneralizedTime\: VALUE will be a null terminated string in the same format used to set
 576   *                    the value
 577   *
 578   * \item OCTET STRING\: VALUE will contain the octet string and LEN will be the number of octet.
 579   *
 580   * \item GeneralString\: VALUE will contain the generalstring and LEN will be the number of octet.
 581   *
 582   * \item BIT STRING\: VALUE will contain the bit string organized by bytes and LEN will be the
 583   *               number of bits.
 584   *
 585   * \item CHOICE\: if NAME indicates a choice type, VALUE will specify the alternative selected
 586   *
 587   * \item ANY\: if NAME indicates an any type, VALUE will indicate the DER encoding of the structure
 588   *        actually used.
 589   *\end{itemize}
 590   *
 591   * If an element is OPTIONAL and the function "read_value" returns ASN1_ELEMENT_NOT_FOUND, it
 592   * means that this element wasn't present in the der encoding that created the structure.
 593   * The first element of a SEQUENCE_OF or SET_OF is named "?1". The second one "?2" and so on.
 594   *
 595   **/
 596 asn1_retCode
 597 asn1_read_value(node_asn *root,const char *name,unsigned char *value, int *len)
 598 {
 599   node_asn *node,*p,*p2;
 600   int len2,len3;
 601   int value_size = *len;
 602
 603   node=_asn1_find_node(root,name);
 604   if(node==NULL) return  ASN1_ELEMENT_NOT_FOUND;
 605
 606   if((type_field(node->type)!=TYPE_NULL) &&
 607      (type_field(node->type)!=TYPE_CHOICE) &&
 608      !(node->type&CONST_DEFAULT) && !(node->type&CONST_ASSIGN) &&
 609      (node->value==NULL))
 610     return ASN1_VALUE_NOT_FOUND;
 611
 612   switch(type_field(node->type)){
 613   case TYPE_NULL:
 614     PUT_STR_VALUE( value, value_size, "NULL");
 615     break;
 616   case TYPE_BOOLEAN:
 617     if((node->type&CONST_DEFAULT) && (node->value==NULL)){
 618       p=node->down;
 619       while(type_field(p->type)!=TYPE_DEFAULT) p=p->right;
 620       if(p->type&CONST_TRUE) {
 621         PUT_STR_VALUE( value, value_size, "TRUE");
 622       } else {
 623         PUT_STR_VALUE(value, value_size, "FALSE");
 624       }
 625     }
 626     else if(node->value[0]=='T') {
 627         PUT_STR_VALUE(value, value_size, "TRUE");
 628     }
 629     else {
 630         PUT_STR_VALUE(value, value_size, "FALSE");
 631     }
 632     break;
 633   case TYPE_INTEGER: case TYPE_ENUMERATED:
 634     if((node->type&CONST_DEFAULT) && (node->value==NULL)){
 635       p=node->down;
 636       while(type_field(p->type)!=TYPE_DEFAULT) p=p->right;
 637       if((isdigit(p->value[0])) || (p->value[0]=='-') || (p->value[0]=='+')){
 638         if (_asn1_convert_integer(p->value,value,value_size, len) !=
 639             ASN1_SUCCESS)
 640           return ASN1_MEM_ERROR;
 641       }
 642       else{ /* is an identifier like v1 */
 643         p2=node->down;
 644         while(p2){
 645           if(type_field(p2->type)==TYPE_CONSTANT){
 646             if((p2->name) && (!strcmp(p2->name,p->value))){
 647               if (_asn1_convert_integer(p2->value,value,value_size, len) !=
 648                   ASN1_SUCCESS)
 649                 return ASN1_MEM_ERROR;
 650               break;
 651             }
 652           }
 653           p2=p2->right;
 654         }
 655       }
 656     }
 657     else{
 658       len2=-1;
 659       if (_asn1_get_octet_der(node->value,&len2,value, value_size, len)!=ASN1_SUCCESS) return ASN1_MEM_ERROR;
 660     }
 661     break;
 662   case TYPE_OBJECT_ID:
 663     if(node->type&CONST_ASSIGN){
 664       value[0]=0;
 665       p=node->down;
 666       while(p){
 667         if(type_field(p->type)==TYPE_CONSTANT){
 668           ADD_STR_VALUE(value,value_size,p->value);
 669           if(p->right) {
 670           ADD_STR_VALUE(value,value_size,".");
 671           }
 672         }
 673         p=p->right;
 674       }
 675       *len = strlen(value) + 1;
 676     }
 677     else if((node->type&CONST_DEFAULT) && (node->value==NULL)){
 678       p=node->down;
 679       while(type_field(p->type)!=TYPE_DEFAULT) p=p->right;
 680       PUT_STR_VALUE(value, value_size, p->value);
 681       }
 682     else {
 683       PUT_STR_VALUE(value, value_size, node->value);
 684     }
 685     break;
 686   case TYPE_TIME:
 687     PUT_STR_VALUE( value, value_size, node->value);
 688     break;
 689   case TYPE_OCTET_STRING:
 690     len2=-1;
 691     if (_asn1_get_octet_der(node->value,&len2,value, value_size, len)!=ASN1_SUCCESS) return ASN1_MEM_ERROR;
 692     break;
 693   case TYPE_GENERALSTRING:
 694     len2=-1;
 695     if (_asn1_get_octet_der(node->value,&len2,value, value_size, len)!=ASN1_SUCCESS) return ASN1_MEM_ERROR;
 696     break;
 697   case TYPE_BIT_STRING:
 698     len2=-1;
 699     if (_asn1_get_bit_der(node->value,&len2,value,value_size,len)!=ASN1_SUCCESS) return ASN1_MEM_ERROR;
 700     break;
 701   case TYPE_CHOICE:
 702     PUT_STR_VALUE( value, value_size, node->down->name);
 703     break;
 704   case TYPE_ANY:
 705     len3=-1;
 706     len2=_asn1_get_length_der(node->value,&len3);
 707     PUT_VALUE( value, value_size, node->value+len3, len2);
 708     break;
 709   default:
 710     return  ASN1_ELEMENT_NOT_FOUND;
 711     break;
 712   }
 713   return ASN1_SUCCESS;
 714 }
 715
 716
 717 /**
 718   * asn1_read_tag - Returns the TAG of one element inside a structure
 719   * @root: pointer to a structure
 720   * @name: the name of the element inside a structure.
 721   * @tagValue:  variable that will contain the TAG value.
 722   * @classValue: variable that will specify the TAG type.
 723   *
 724   * Description:
 725   *
 726   * Returns the TAG and the CLASS of one element inside a structure.
 727   * CLASS can have one of these constants: ASN1_CLASS_APPLICATION,
 728   * ASN1_CLASS_UNIVERSAL, ASN1_CLASS_PRIVATE or ASN1_CLASS_CONTEXT_SPECIFIC.
 729   *
 730   * Returns:
 731   *
 732   *   ASN1_SUCCESS\: set value OK
 733   *
 734   *   ASN1_ELEMENT_NOT_FOUND\: NAME is not a valid element.
 735   *
 736   **/
 737 asn1_retCode
 738 asn1_read_tag(node_asn *root,const char *name,int *tagValue, int *classValue)
 739 {
 740   node_asn *node,*p,*pTag;
 741
 742   node=_asn1_find_node(root,name);
 743   if(node==NULL) return  ASN1_ELEMENT_NOT_FOUND;
 744
 745   p=node->down;
 746
 747   /* pTag will points to the IMPLICIT TAG */
 748   pTag=NULL;
 749   if(node->type&CONST_TAG){
 750     while(p){
 751       if(type_field(p->type)==TYPE_TAG){
 752         if((p->type&CONST_IMPLICIT) && (pTag==NULL))
 753           pTag=p;
 754         else if(p->type&CONST_EXPLICIT)
 755           pTag=NULL;
 756       }
 757       p=p->right;
 758     }
 759   }
 760
 761   if(pTag){
 762     *tagValue=strtoul(pTag->value,NULL,10);
 763
 764     if(pTag->type&CONST_APPLICATION) *classValue=ASN1_CLASS_APPLICATION;
 765     else if(pTag->type&CONST_UNIVERSAL) *classValue=ASN1_CLASS_UNIVERSAL;
 766     else if(pTag->type&CONST_PRIVATE) *classValue=ASN1_CLASS_PRIVATE;
 767     else *classValue=ASN1_CLASS_CONTEXT_SPECIFIC;
 768   }
 769   else{
 770     *classValue=ASN1_CLASS_UNIVERSAL;
 771
 772     switch(type_field(node->type)){
 773     case TYPE_NULL:
 774       *tagValue=ASN1_TAG_NULL;break;
 775     case TYPE_BOOLEAN:
 776       *tagValue=ASN1_TAG_BOOLEAN;break;
 777     case TYPE_INTEGER:
 778       *tagValue=ASN1_TAG_INTEGER;break;
 779     case TYPE_ENUMERATED:
 780       *tagValue=ASN1_TAG_ENUMERATED;break;
 781     case TYPE_OBJECT_ID:
 782       *tagValue=ASN1_TAG_OBJECT_ID;break;
 783     case TYPE_TIME:
 784       if(node->type&CONST_UTC){
 785         *tagValue=ASN1_TAG_UTCTime;
 786       }
 787       else *tagValue=ASN1_TAG_GENERALIZEDTime;
 788       break;
 789     case TYPE_OCTET_STRING:
 790       *tagValue=ASN1_TAG_OCTET_STRING;break;
 791     case TYPE_GENERALSTRING:
 792       *tagValue=ASN1_TAG_GENERALSTRING;break;
 793     case TYPE_BIT_STRING:
 794       *tagValue=ASN1_TAG_BIT_STRING;break;
 795     case TYPE_SEQUENCE: case TYPE_SEQUENCE_OF:
 796       *tagValue=ASN1_TAG_SEQUENCE;break;
 797     case TYPE_SET: case TYPE_SET_OF:
 798       *tagValue=ASN1_TAG_SET;break;
 799     case TYPE_TAG:
 800     case TYPE_CHOICE:
 801     case TYPE_ANY:
 802       break;
 803     default:
 804       break;
 805     }
 806   }
 807
 808
 809   return ASN1_SUCCESS;
 810
 811 }
 812
 813
 814
 815