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.h>
  62
  63 static unsigned long tag2bit[32]={
  64 0,      0,      0,      B_ASN1_BIT_STRING,      /* tags  0 -  3 */
  65 B_ASN1_OCTET_STRING,    0,      0,              B_ASN1_UNKNOWN,/* tags  4- 7 */
  66 B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,/* tags  8-11 */
  67 B_ASN1_UTF8STRING,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,/* tags 12-15 */
  68 0,      0,      B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING,   /* tags 16-19 */
  69 B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING,       /* tags 20-22 */
  70 B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME,                        /* tags 23-24 */
  71 B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING,  /* tags 25-27 */
  72 B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN, /* tags 28-31 */
  73         };
  74
  75 unsigned long ASN1_tag2bit(int tag)
  76 {
  77         if((tag < 0) || (tag > 30)) return 0;
  78         return tag2bit[tag];
  79 }
  80
  81 static int asn1_collate_primitive(ASN1_STRING *a, ASN1_CTX *c);
  82 /* type is a 'bitmap' of acceptable string types.
  83  */
  84 ASN1_STRING *d2i_ASN1_type_bytes(ASN1_STRING **a, unsigned char **pp,
  85              long length, int type)
  86         {
  87         ASN1_STRING *ret=NULL;
  88         unsigned char *p,*s;
  89         long len;
  90         int inf,tag,xclass;
  91         int i=0;
  92
  93         p= *pp;
  94         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
  95         if (inf & 0x80) goto err;
  96
  97         if (tag >= 32)
  98                 {
  99                 i=ASN1_R_TAG_VALUE_TOO_HIGH;;
 100                 goto err;
 101                 }
 102         if (!(tag2bit[tag] & type))
 103                 {
 104                 i=ASN1_R_WRONG_TYPE;
 105                 goto err;
 106                 }
 107
 108         /* If a bit-string, exit early */
 109         if (tag == V_ASN1_BIT_STRING)
 110                 return(d2i_ASN1_BIT_STRING(a,pp,length));
 111
 112         if ((a == NULL) || ((*a) == NULL))
 113                 {
 114                 if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
 115                 }
 116         else
 117                 ret=(*a);
 118
 119         if (len != 0)
 120                 {
 121                 s=(unsigned char *)OPENSSL_malloc((int)len+1);
 122                 if (s == NULL)
 123                         {
 124                         i=ERR_R_MALLOC_FAILURE;
 125                         goto err;
 126                         }
 127                 memcpy(s,p,(int)len);
 128                 s[len]='\0';
 129                 p+=len;
 130                 }
 131         else
 132                 s=NULL;
 133
 134         if (ret->data != NULL) OPENSSL_free(ret->data);
 135         ret->length=(int)len;
 136         ret->data=s;
 137         ret->type=tag;
 138         if (a != NULL) (*a)=ret;
 139         *pp=p;
 140         return(ret);
 141 err:
 142         ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,i);
 143         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 144                 ASN1_STRING_free(ret);
 145         return(NULL);
 146         }
 147
 148 int i2d_ASN1_bytes(ASN1_STRING *a, unsigned char **pp, int tag, int xclass)
 149         {
 150         int ret,r,constructed;
 151         unsigned char *p;
 152
 153         if (a == NULL)  return(0);
 154
 155         if (tag == V_ASN1_BIT_STRING)
 156                 return(i2d_ASN1_BIT_STRING(a,pp));
 157
 158         ret=a->length;
 159         r=ASN1_object_size(0,ret,tag);
 160         if (pp == NULL) return(r);
 161         p= *pp;
 162
 163         if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET))
 164                 constructed=1;
 165         else
 166                 constructed=0;
 167         ASN1_put_object(&p,constructed,ret,tag,xclass);
 168         memcpy(p,a->data,a->length);
 169         p+=a->length;
 170         *pp= p;
 171         return(r);
 172         }
 173
 174 ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, unsigned char **pp, long length,
 175              int Ptag, int Pclass)
 176         {
 177         ASN1_STRING *ret=NULL;
 178         unsigned char *p,*s;
 179         long len;
 180         int inf,tag,xclass;
 181         int i=0;
 182
 183         if ((a == NULL) || ((*a) == NULL))
 184                 {
 185                 if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
 186                 }
 187         else
 188                 ret=(*a);
 189
 190         p= *pp;
 191         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
 192         if (inf & 0x80)
 193                 {
 194                 i=ASN1_R_BAD_OBJECT_HEADER;
 195                 goto err;
 196                 }
 197
 198         if (tag != Ptag)
 199                 {
 200                 i=ASN1_R_WRONG_TAG;
 201                 goto err;
 202                 }
 203
 204         if (inf & V_ASN1_CONSTRUCTED)
 205                 {
 206                 ASN1_CTX c;
 207
 208                 c.pp=pp;
 209                 c.p=p;
 210                 c.inf=inf;
 211                 c.slen=len;
 212                 c.tag=Ptag;
 213                 c.xclass=Pclass;
 214                 c.max=(length == 0)?0:(p+length);
 215                 if (!asn1_collate_primitive(ret,&c))
 216                         goto err;
 217                 else
 218                         {
 219                         p=c.p;
 220                         }
 221                 }
 222         else
 223                 {
 224                 if (len != 0)
 225                         {
 226                         if ((ret->length < len) || (ret->data == NULL))
 227                                 {
 228                                 if (ret->data != NULL) OPENSSL_free(ret->data);
 229                                 s=(unsigned char *)OPENSSL_malloc((int)len + 1);
 230                                 if (s == NULL)
 231                                         {
 232                                         i=ERR_R_MALLOC_FAILURE;
 233                                         goto err;
 234                                         }
 235                                 }
 236                         else
 237                                 s=ret->data;
 238                         memcpy(s,p,(int)len);
 239                         s[len] = '\0';
 240                         p+=len;
 241                         }
 242                 else
 243                         {
 244                         s=NULL;
 245                         if (ret->data != NULL) OPENSSL_free(ret->data);
 246                         }
 247
 248                 ret->length=(int)len;
 249                 ret->data=s;
 250                 ret->type=Ptag;
 251                 }
 252
 253         if (a != NULL) (*a)=ret;
 254         *pp=p;
 255         return(ret);
 256 err:
 257         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 258                 ASN1_STRING_free(ret);
 259         ASN1err(ASN1_F_D2I_ASN1_BYTES,i);
 260         return(NULL);
 261         }
 262
 263
 264 /* We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapse
 265  * them into the one structure that is then returned */
 266 /* There have been a few bug fixes for this function from
 267  * Paul Keogh <paul.keogh@sse.ie>, many thanks to him */
 268 static int asn1_collate_primitive(ASN1_STRING *a, ASN1_CTX *c)
 269         {
 270         ASN1_STRING *os=NULL;
 271         BUF_MEM b;
 272         int num;
 273
 274         b.length=0;
 275         b.max=0;
 276         b.data=NULL;
 277
 278         if (a == NULL)
 279                 {
 280                 c->error=ERR_R_PASSED_NULL_PARAMETER;
 281                 goto err;
 282                 }
 283
 284         num=0;
 285         for (;;)
 286                 {
 287                 if (c->inf & 1)
 288                         {
 289                         c->eos=ASN1_check_infinite_end(&c->p,
 290                                 (long)(c->max-c->p));
 291                         if (c->eos) break;
 292                         }
 293                 else
 294                         {
 295                         if (c->slen <= 0) break;
 296                         }
 297
 298                 c->q=c->p;
 299                 if (d2i_ASN1_bytes(&os,&c->p,c->max-c->p,c->tag,c->xclass)
 300                         == NULL)
 301                         {
 302                         c->error=ERR_R_ASN1_LIB;
 303                         goto err;
 304                         }
 305
 306                 if (!BUF_MEM_grow(&b,num+os->length))
 307                         {
 308                         c->error=ERR_R_BUF_LIB;
 309                         goto err;
 310                         }
 311                 memcpy(&(b.data[num]),os->data,os->length);
 312                 if (!(c->inf & 1))
 313                         c->slen-=(c->p-c->q);
 314                 num+=os->length;
 315                 }
 316
 317         if (!asn1_Finish(c)) goto err;
 318
 319         a->length=num;
 320         if (a->data != NULL) OPENSSL_free(a->data);
 321         a->data=(unsigned char *)b.data;
 322         if (os != NULL) ASN1_STRING_free(os);
 323         return(1);
 324 err:
 325         ASN1err(ASN1_F_ASN1_COLLATE_PRIMITIVE,c->error);
 326         if (os != NULL) ASN1_STRING_free(os);
 327         if (b.data != NULL) OPENSSL_free(b.data);
 328         return(0);
 329         }
 330