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 int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c);
  64 /* type is a 'bitmap' of acceptable string types.
  65  */
  66 ASN1_STRING *d2i_ASN1_type_bytes(ASN1_STRING **a, const unsigned char **pp,
  67              long length, int type)
  68         {
  69         ASN1_STRING *ret=NULL;
  70         const unsigned char *p;
  71         unsigned char *s;
  72         long len;
  73         int inf,tag,xclass;
  74         int i=0;
  75
  76         p= *pp;
  77         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
  78         if (inf & 0x80) goto err;
  79
  80         if (tag >= 32)
  81                 {
  82                 i=ASN1_R_TAG_VALUE_TOO_HIGH;
  83                 goto err;
  84                 }
  85         if (!(ASN1_tag2bit(tag) & type))
  86                 {
  87                 i=ASN1_R_WRONG_TYPE;
  88                 goto err;
  89                 }
  90
  91         /* If a bit-string, exit early */
  92         if (tag == V_ASN1_BIT_STRING)
  93                 return(d2i_ASN1_BIT_STRING(a,pp,length));
  94
  95         if ((a == NULL) || ((*a) == NULL))
  96                 {
  97                 if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
  98                 }
  99         else
 100                 ret=(*a);
 101
 102         if (len != 0)
 103                 {
 104                 s=(unsigned char *)OPENSSL_malloc((int)len+1);
 105                 if (s == NULL)
 106                         {
 107                         i=ERR_R_MALLOC_FAILURE;
 108                         goto err;
 109                         }
 110                 memcpy(s,p,(int)len);
 111                 s[len]='\0';
 112                 p+=len;
 113                 }
 114         else
 115                 s=NULL;
 116
 117         if (ret->data != NULL) OPENSSL_free(ret->data);
 118         ret->length=(int)len;
 119         ret->data=s;
 120         ret->type=tag;
 121         if (a != NULL) (*a)=ret;
 122         *pp=p;
 123         return(ret);
 124 err:
 125         ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,i);
 126         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 127                 ASN1_STRING_free(ret);
 128         return(NULL);
 129         }
 130
 131 int i2d_ASN1_bytes(ASN1_STRING *a, unsigned char **pp, int tag, int xclass)
 132         {
 133         int ret,r,constructed;
 134         unsigned char *p;
 135
 136         if (a == NULL)  return(0);
 137
 138         if (tag == V_ASN1_BIT_STRING)
 139                 return(i2d_ASN1_BIT_STRING(a,pp));
 140
 141         ret=a->length;
 142         r=ASN1_object_size(0,ret,tag);
 143         if (pp == NULL) return(r);
 144         p= *pp;
 145
 146         if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET))
 147                 constructed=1;
 148         else
 149                 constructed=0;
 150         ASN1_put_object(&p,constructed,ret,tag,xclass);
 151         memcpy(p,a->data,a->length);
 152         p+=a->length;
 153         *pp= p;
 154         return(r);
 155         }
 156
 157 ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, const unsigned char **pp,
 158              long length, int Ptag, int Pclass)
 159         {
 160         ASN1_STRING *ret=NULL;
 161         const unsigned char *p;
 162         unsigned char *s;
 163         long len;
 164         int inf,tag,xclass;
 165         int i=0;
 166
 167         if ((a == NULL) || ((*a) == NULL))
 168                 {
 169                 if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
 170                 }
 171         else
 172                 ret=(*a);
 173
 174         p= *pp;
 175         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
 176         if (inf & 0x80)
 177                 {
 178                 i=ASN1_R_BAD_OBJECT_HEADER;
 179                 goto err;
 180                 }
 181
 182         if (tag != Ptag)
 183                 {
 184                 i=ASN1_R_WRONG_TAG;
 185                 goto err;
 186                 }
 187
 188         if (inf & V_ASN1_CONSTRUCTED)
 189                 {
 190                 ASN1_const_CTX c;
 191
 192                 c.pp=pp;
 193                 c.p=p;
 194                 c.inf=inf;
 195                 c.slen=len;
 196                 c.tag=Ptag;
 197                 c.xclass=Pclass;
 198                 c.max=(length == 0)?0:(p+length);
 199                 if (!asn1_collate_primitive(ret,&c))
 200                         goto err;
 201                 else
 202                         {
 203                         p=c.p;
 204                         }
 205                 }
 206         else
 207                 {
 208                 if (len != 0)
 209                         {
 210                         if ((ret->length < len) || (ret->data == NULL))
 211                                 {
 212                                 if (ret->data != NULL) OPENSSL_free(ret->data);
 213                                 s=(unsigned char *)OPENSSL_malloc((int)len + 1);
 214                                 if (s == NULL)
 215                                         {
 216                                         i=ERR_R_MALLOC_FAILURE;
 217                                         goto err;
 218                                         }
 219                                 }
 220                         else
 221                                 s=ret->data;
 222                         memcpy(s,p,(int)len);
 223                         s[len] = '\0';
 224                         p+=len;
 225                         }
 226                 else
 227                         {
 228                         s=NULL;
 229                         if (ret->data != NULL) OPENSSL_free(ret->data);
 230                         }
 231
 232                 ret->length=(int)len;
 233                 ret->data=s;
 234                 ret->type=Ptag;
 235                 }
 236
 237         if (a != NULL) (*a)=ret;
 238         *pp=p;
 239         return(ret);
 240 err:
 241         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 242                 ASN1_STRING_free(ret);
 243         ASN1err(ASN1_F_D2I_ASN1_BYTES,i);
 244         return(NULL);
 245         }
 246
 247
 248 /* We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapse
 249  * them into the one structure that is then returned */
 250 /* There have been a few bug fixes for this function from
 251  * Paul Keogh <paul.keogh@sse.ie>, many thanks to him */
 252 static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c)
 253         {
 254         ASN1_STRING *os=NULL;
 255         BUF_MEM b;
 256         int num;
 257
 258         b.length=0;
 259         b.max=0;
 260         b.data=NULL;
 261
 262         if (a == NULL)
 263                 {
 264                 c->error=ERR_R_PASSED_NULL_PARAMETER;
 265                 goto err;
 266                 }
 267
 268         num=0;
 269         for (;;)
 270                 {
 271                 if (c->inf & 1)
 272                         {
 273                         c->eos=ASN1_const_check_infinite_end(&c->p,
 274                                 (long)(c->max-c->p));
 275                         if (c->eos) break;
 276                         }
 277                 else
 278                         {
 279                         if (c->slen <= 0) break;
 280                         }
 281
 282                 c->q=c->p;
 283                 if (d2i_ASN1_bytes(&os,&c->p,c->max-c->p,c->tag,c->xclass)
 284                         == NULL)
 285                         {
 286                         c->error=ERR_R_ASN1_LIB;
 287                         goto err;
 288                         }
 289
 290                 if (!BUF_MEM_grow_clean(&b,num+os->length))
 291                         {
 292                         c->error=ERR_R_BUF_LIB;
 293                         goto err;
 294                         }
 295                 memcpy(&(b.data[num]),os->data,os->length);
 296                 if (!(c->inf & 1))
 297                         c->slen-=(c->p-c->q);
 298                 num+=os->length;
 299                 }
 300
 301         if (!asn1_const_Finish(c)) goto err;
 302
 303         a->length=num;
 304         if (a->data != NULL) OPENSSL_free(a->data);
 305         a->data=(unsigned char *)b.data;
 306         if (os != NULL) ASN1_STRING_free(os);
 307         return(1);
 308 err:
 309         ASN1err(ASN1_F_ASN1_COLLATE_PRIMITIVE,c->error);
 310         if (os != NULL) ASN1_STRING_free(os);
 311         if (b.data != NULL) OPENSSL_free(b.data);
 312         return(0);
 313         }
 314