crypto/asn1/a_bytes.c

   1 /* crypto/asn1/a_bytes.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 "cryptlib.h"
  61 #include <openssl/asn1_mac.h>
  62
  63 /* ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,ASN1_R_WRONG_TYPE);
  64  * ASN1err(ASN1_F_ASN1_COLLATE_PRIMATIVE,ASN1_R_WRONG_TAG);
  65  */
  66
  67 static unsigned long tag2bit[32]={
  68 0,      0,      0,      B_ASN1_BIT_STRING,      /* tags  0 -  3 */
  69 B_ASN1_OCTET_STRING,    0,      0,              B_ASN1_UNKNOWN,/* tags  4- 7 */
  70 B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,/* tags  8-11 */
  71 B_ASN1_UTF8STRING,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,/* tags 12-15 */
  72 0,      0,      B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING,
  73 B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING,0,
  74 0,B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING,
  75 B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN,
  76         };
  77
  78 #ifndef NOPROTO
  79 static int asn1_collate_primative(ASN1_STRING *a, ASN1_CTX *c);
  80 #else
  81 static int asn1_collate_primative();
  82 #endif
  83
  84 /* type is a 'bitmap' of acceptable string types.
  85  */
  86 ASN1_STRING *d2i_ASN1_type_bytes(ASN1_STRING **a, unsigned char **pp,
  87              long length, int type)
  88         {
  89         ASN1_STRING *ret=NULL;
  90         unsigned char *p,*s;
  91         long len;
  92         int inf,tag,xclass;
  93         int i=0;
  94
  95         p= *pp;
  96         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
  97         if (inf & 0x80) goto err;
  98
  99         if (tag >= 32)
 100                 {
 101                 i=ASN1_R_TAG_VALUE_TOO_HIGH;;
 102                 goto err;
 103                 }
 104         if (!(tag2bit[tag] & type))
 105                 {
 106                 i=ASN1_R_WRONG_TYPE;
 107                 goto err;
 108                 }
 109
 110         /* If a bit-string, exit early */
 111         if (tag == V_ASN1_BIT_STRING)
 112                 return(d2i_ASN1_BIT_STRING(a,pp,length));
 113
 114         if ((a == NULL) || ((*a) == NULL))
 115                 {
 116                 if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
 117                 }
 118         else
 119                 ret=(*a);
 120
 121         if (len != 0)
 122                 {
 123                 s=(unsigned char *)Malloc((int)len+1);
 124                 if (s == NULL)
 125                         {
 126                         i=ERR_R_MALLOC_FAILURE;
 127                         goto err;
 128                         }
 129                 memcpy(s,p,(int)len);
 130                 s[len]='\0';
 131                 p+=len;
 132                 }
 133         else
 134                 s=NULL;
 135
 136         if (ret->data != NULL) Free((char *)ret->data);
 137         ret->length=(int)len;
 138         ret->data=s;
 139         ret->type=tag;
 140         if (a != NULL) (*a)=ret;
 141         *pp=p;
 142         return(ret);
 143 err:
 144         ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,i);
 145         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 146                 ASN1_STRING_free(ret);
 147         return(NULL);
 148         }
 149
 150 int i2d_ASN1_bytes(ASN1_STRING *a, unsigned char **pp, int tag, int xclass)
 151         {
 152         int ret,r,constructed;
 153         unsigned char *p;
 154
 155         if (a == NULL)  return(0);
 156
 157         if (tag == V_ASN1_BIT_STRING)
 158                 return(i2d_ASN1_BIT_STRING(a,pp));
 159
 160         ret=a->length;
 161         r=ASN1_object_size(0,ret,tag);
 162         if (pp == NULL) return(r);
 163         p= *pp;
 164
 165         if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET))
 166                 constructed=1;
 167         else
 168                 constructed=0;
 169         ASN1_put_object(&p,constructed,ret,tag,xclass);
 170         memcpy(p,a->data,a->length);
 171         p+=a->length;
 172         *pp= p;
 173         return(r);
 174         }
 175
 176 ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, unsigned char **pp, long length,
 177              int Ptag, int Pclass)
 178         {
 179         ASN1_STRING *ret=NULL;
 180         unsigned char *p,*s;
 181         long len;
 182         int inf,tag,xclass;
 183         int i=0;
 184
 185         if ((a == NULL) || ((*a) == NULL))
 186                 {
 187                 if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
 188                 }
 189         else
 190                 ret=(*a);
 191
 192         p= *pp;
 193         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
 194         if (inf & 0x80)
 195                 {
 196                 i=ASN1_R_BAD_OBJECT_HEADER;
 197                 goto err;
 198                 }
 199
 200         if (tag != Ptag)
 201                 {
 202                 i=ASN1_R_WRONG_TAG;
 203                 goto err;
 204                 }
 205
 206         if (inf & V_ASN1_CONSTRUCTED)
 207                 {
 208                 ASN1_CTX c;
 209
 210                 c.pp=pp;
 211                 c.p=p;
 212                 c.inf=inf;
 213                 c.slen=len;
 214                 c.tag=Ptag;
 215                 c.xclass=Pclass;
 216                 c.max=(length == 0)?0:(p+length);
 217                 if (!asn1_collate_primative(ret,&c))
 218                         goto err;
 219                 else
 220                         {
 221                         p=c.p;
 222                         }
 223                 }
 224         else
 225                 {
 226                 if (len != 0)
 227                         {
 228                         if ((ret->length < len) || (ret->data == NULL))
 229                                 {
 230                                 if (ret->data != NULL) Free((char *)ret->data);
 231                                 s=(unsigned char *)Malloc((int)len);
 232                                 if (s == NULL)
 233                                         {
 234                                         i=ERR_R_MALLOC_FAILURE;
 235                                         goto err;
 236                                         }
 237                                 }
 238                         else
 239                                 s=ret->data;
 240                         memcpy(s,p,(int)len);
 241                         p+=len;
 242                         }
 243                 else
 244                         {
 245                         s=NULL;
 246                         if (ret->data != NULL) Free((char *)ret->data);
 247                         }
 248
 249                 ret->length=(int)len;
 250                 ret->data=s;
 251                 ret->type=Ptag;
 252                 }
 253
 254         if (a != NULL) (*a)=ret;
 255         *pp=p;
 256         return(ret);
 257 err:
 258         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 259                 ASN1_STRING_free(ret);
 260         ASN1err(ASN1_F_D2I_ASN1_BYTES,i);
 261         return(NULL);
 262         }
 263
 264
 265 /* We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapes
 266  * them into the one struture that is then returned */
 267 /* There have been a few bug fixes for this function from
 268  * Paul Keogh <paul.keogh@sse.ie>, many thanks to him */
 269 static int asn1_collate_primative(ASN1_STRING *a, ASN1_CTX *c)
 270         {
 271         ASN1_STRING *os=NULL;
 272         BUF_MEM b;
 273         int num;
 274
 275         b.length=0;
 276         b.max=0;
 277         b.data=NULL;
 278
 279         if (a == NULL)
 280                 {
 281                 c->error=ERR_R_PASSED_NULL_PARAMETER;
 282                 goto err;
 283                 }
 284
 285         num=0;
 286         for (;;)
 287                 {
 288                 if (c->inf & 1)
 289                         {
 290                         c->eos=ASN1_check_infinite_end(&c->p,
 291                                 (long)(c->max-c->p));
 292                         if (c->eos) break;
 293                         }
 294                 else
 295                         {
 296                         if (c->slen <= 0) break;
 297                         }
 298
 299                 c->q=c->p;
 300                 if (d2i_ASN1_bytes(&os,&c->p,c->max-c->p,c->tag,c->xclass)
 301                         == NULL)
 302                         {
 303                         c->error=ERR_R_ASN1_LIB;
 304                         goto err;
 305                         }
 306
 307                 if (!BUF_MEM_grow(&b,num+os->length))
 308                         {
 309                         c->error=ERR_R_BUF_LIB;
 310                         goto err;
 311                         }
 312                 memcpy(&(b.data[num]),os->data,os->length);
 313                 if (!(c->inf & 1))
 314                         c->slen-=(c->p-c->q);
 315                 num+=os->length;
 316                 }
 317
 318         if (!asn1_Finish(c)) goto err;
 319
 320         a->length=num;
 321         if (a->data != NULL) Free(a->data);
 322         a->data=(unsigned char *)b.data;
 323         if (os != NULL) ASN1_STRING_free(os);
 324         return(1);
 325 err:
 326         ASN1err(ASN1_F_ASN1_COLLATE_PRIMATIVE,c->error);
 327         if (os != NULL) ASN1_STRING_free(os);
 328         if (b.data != NULL) Free(b.data);
 329         return(0);
 330         }
 331