crypto/asn1/a_object.c

   1 /* crypto/asn1/a_object.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/buffer.h>
  63 #include <openssl/asn1.h>
  64 #include <openssl/objects.h>
  65 #include <openssl/bn.h>
  66 #include "internal/asn1_int.h"
  67 #include "asn1_locl.h"
  68
  69 int i2d_ASN1_OBJECT(ASN1_OBJECT *a, unsigned char **pp)
  70 {
  71     unsigned char *p;
  72     int objsize;
  73
  74     if ((a == NULL) || (a->data == NULL))
  75         return (0);
  76
  77     objsize = ASN1_object_size(0, a->length, V_ASN1_OBJECT);
  78     if (pp == NULL)
  79         return objsize;
  80
  81     p = *pp;
  82     ASN1_put_object(&p, 0, a->length, V_ASN1_OBJECT, V_ASN1_UNIVERSAL);
  83     memcpy(p, a->data, a->length);
  84     p += a->length;
  85
  86     *pp = p;
  87     return (objsize);
  88 }
  89
  90 int a2d_ASN1_OBJECT(unsigned char *out, int olen, const char *buf, int num)
  91 {
  92     int i, first, len = 0, c, use_bn;
  93     char ftmp[24], *tmp = ftmp;
  94     int tmpsize = sizeof ftmp;
  95     const char *p;
  96     unsigned long l;
  97     BIGNUM *bl = NULL;
  98
  99     if (num == 0)
 100         return (0);
 101     else if (num == -1)
 102         num = strlen(buf);
 103
 104     p = buf;
 105     c = *(p++);
 106     num--;
 107     if ((c >= '0') && (c <= '2')) {
 108         first = c - '0';
 109     } else {
 110         ASN1err(ASN1_F_A2D_ASN1_OBJECT, ASN1_R_FIRST_NUM_TOO_LARGE);
 111         goto err;
 112     }
 113
 114     if (num <= 0) {
 115         ASN1err(ASN1_F_A2D_ASN1_OBJECT, ASN1_R_MISSING_SECOND_NUMBER);
 116         goto err;
 117     }
 118     c = *(p++);
 119     num--;
 120     for (;;) {
 121         if (num <= 0)
 122             break;
 123         if ((c != '.') && (c != ' ')) {
 124             ASN1err(ASN1_F_A2D_ASN1_OBJECT, ASN1_R_INVALID_SEPARATOR);
 125             goto err;
 126         }
 127         l = 0;
 128         use_bn = 0;
 129         for (;;) {
 130             if (num <= 0)
 131                 break;
 132             num--;
 133             c = *(p++);
 134             if ((c == ' ') || (c == '.'))
 135                 break;
 136             if ((c < '0') || (c > '9')) {
 137                 ASN1err(ASN1_F_A2D_ASN1_OBJECT, ASN1_R_INVALID_DIGIT);
 138                 goto err;
 139             }
 140             if (!use_bn && l >= ((ULONG_MAX - 80) / 10L)) {
 141                 use_bn = 1;
 142                 if (!bl)
 143                     bl = BN_new();
 144                 if (!bl || !BN_set_word(bl, l))
 145                     goto err;
 146             }
 147             if (use_bn) {
 148                 if (!BN_mul_word(bl, 10L)
 149                     || !BN_add_word(bl, c - '0'))
 150                     goto err;
 151             } else
 152                 l = l * 10L + (long)(c - '0');
 153         }
 154         if (len == 0) {
 155             if ((first < 2) && (l >= 40)) {
 156                 ASN1err(ASN1_F_A2D_ASN1_OBJECT,
 157                         ASN1_R_SECOND_NUMBER_TOO_LARGE);
 158                 goto err;
 159             }
 160             if (use_bn) {
 161                 if (!BN_add_word(bl, first * 40))
 162                     goto err;
 163             } else
 164                 l += (long)first *40;
 165         }
 166         i = 0;
 167         if (use_bn) {
 168             int blsize;
 169             blsize = BN_num_bits(bl);
 170             blsize = (blsize + 6) / 7;
 171             if (blsize > tmpsize) {
 172                 if (tmp != ftmp)
 173                     OPENSSL_free(tmp);
 174                 tmpsize = blsize + 32;
 175                 tmp = OPENSSL_malloc(tmpsize);
 176                 if (!tmp)
 177                     goto err;
 178             }
 179             while (blsize--)
 180                 tmp[i++] = (unsigned char)BN_div_word(bl, 0x80L);
 181         } else {
 182
 183             for (;;) {
 184                 tmp[i++] = (unsigned char)l & 0x7f;
 185                 l >>= 7L;
 186                 if (l == 0L)
 187                     break;
 188             }
 189
 190         }
 191         if (out != NULL) {
 192             if (len + i > olen) {
 193                 ASN1err(ASN1_F_A2D_ASN1_OBJECT, ASN1_R_BUFFER_TOO_SMALL);
 194                 goto err;
 195             }
 196             while (--i > 0)
 197                 out[len++] = tmp[i] | 0x80;
 198             out[len++] = tmp[0];
 199         } else
 200             len += i;
 201     }
 202     if (tmp != ftmp)
 203         OPENSSL_free(tmp);
 204     BN_free(bl);
 205     return (len);
 206  err:
 207     if (tmp != ftmp)
 208         OPENSSL_free(tmp);
 209     BN_free(bl);
 210     return (0);
 211 }
 212
 213 int i2t_ASN1_OBJECT(char *buf, int buf_len, ASN1_OBJECT *a)
 214 {
 215     return OBJ_obj2txt(buf, buf_len, a, 0);
 216 }
 217
 218 int i2a_ASN1_OBJECT(BIO *bp, ASN1_OBJECT *a)
 219 {
 220     char buf[80], *p = buf;
 221     int i;
 222
 223     if ((a == NULL) || (a->data == NULL))
 224         return (BIO_write(bp, "NULL", 4));
 225     i = i2t_ASN1_OBJECT(buf, sizeof buf, a);
 226     if (i > (int)(sizeof(buf) - 1)) {
 227         p = OPENSSL_malloc(i + 1);
 228         if (!p)
 229             return -1;
 230         i2t_ASN1_OBJECT(p, i + 1, a);
 231     }
 232     if (i <= 0) {
 233         i = BIO_write(bp, "<INVALID>", 9);
 234         i += BIO_dump(bp, (const char *)a->data, a->length);
 235         return i;
 236     }
 237     BIO_write(bp, p, i);
 238     if (p != buf)
 239         OPENSSL_free(p);
 240     return (i);
 241 }
 242
 243 ASN1_OBJECT *d2i_ASN1_OBJECT(ASN1_OBJECT **a, const unsigned char **pp,
 244                              long length)
 245 {
 246     const unsigned char *p;
 247     long len;
 248     int tag, xclass;
 249     int inf, i;
 250     ASN1_OBJECT *ret = NULL;
 251     p = *pp;
 252     inf = ASN1_get_object(&p, &len, &tag, &xclass, length);
 253     if (inf & 0x80) {
 254         i = ASN1_R_BAD_OBJECT_HEADER;
 255         goto err;
 256     }
 257
 258     if (tag != V_ASN1_OBJECT) {
 259         i = ASN1_R_EXPECTING_AN_OBJECT;
 260         goto err;
 261     }
 262     ret = c2i_ASN1_OBJECT(a, &p, len);
 263     if (ret)
 264         *pp = p;
 265     return ret;
 266  err:
 267     ASN1err(ASN1_F_D2I_ASN1_OBJECT, i);
 268     return (NULL);
 269 }
 270
 271 ASN1_OBJECT *c2i_ASN1_OBJECT(ASN1_OBJECT **a, const unsigned char **pp,
 272                              long len)
 273 {
 274     ASN1_OBJECT *ret = NULL;
 275     const unsigned char *p;
 276     unsigned char *data;
 277     int i, length;
 278
 279     /*
 280      * Sanity check OID encoding. Need at least one content octet. MSB must
 281      * be clear in the last octet. can't have leading 0x80 in subidentifiers,
 282      * see: X.690 8.19.2
 283      */
 284     if (len <= 0 || len > INT_MAX || pp == NULL || (p = *pp) == NULL ||
 285         p[len - 1] & 0x80) {
 286         ASN1err(ASN1_F_C2I_ASN1_OBJECT, ASN1_R_INVALID_OBJECT_ENCODING);
 287         return NULL;
 288     }
 289     /* Now 0 < len <= INT_MAX, so the cast is safe. */
 290     length = (int)len;
 291     for (i = 0; i < length; i++, p++) {
 292         if (*p == 0x80 && (!i || !(p[-1] & 0x80))) {
 293             ASN1err(ASN1_F_C2I_ASN1_OBJECT, ASN1_R_INVALID_OBJECT_ENCODING);
 294             return NULL;
 295         }
 296     }
 297
 298     /*
 299      * only the ASN1_OBJECTs from the 'table' will have values for ->sn or
 300      * ->ln
 301      */
 302     if ((a == NULL) || ((*a) == NULL) ||
 303         !((*a)->flags & ASN1_OBJECT_FLAG_DYNAMIC)) {
 304         if ((ret = ASN1_OBJECT_new()) == NULL)
 305             return (NULL);
 306     } else
 307         ret = (*a);
 308
 309     p = *pp;
 310     /* detach data from object */
 311     data = (unsigned char *)ret->data;
 312     ret->data = NULL;
 313     /* once detached we can change it */
 314     if ((data == NULL) || (ret->length < length)) {
 315         ret->length = 0;
 316         if (data != NULL)
 317             OPENSSL_free(data);
 318         data = OPENSSL_malloc(length);
 319         if (data == NULL) {
 320             i = ERR_R_MALLOC_FAILURE;
 321             goto err;
 322         }
 323         ret->flags |= ASN1_OBJECT_FLAG_DYNAMIC_DATA;
 324     }
 325     memcpy(data, p, length);
 326     /* reattach data to object, after which it remains const */
 327     ret->data = data;
 328     ret->length = length;
 329     ret->sn = NULL;
 330     ret->ln = NULL;
 331     /* ret->flags=ASN1_OBJECT_FLAG_DYNAMIC; we know it is dynamic */
 332     p += length;
 333
 334     if (a != NULL)
 335         (*a) = ret;
 336     *pp = p;
 337     return (ret);
 338  err:
 339     ASN1err(ASN1_F_C2I_ASN1_OBJECT, i);
 340     if ((a == NULL) || (*a != ret))
 341         ASN1_OBJECT_free(ret);
 342     return (NULL);
 343 }
 344
 345 ASN1_OBJECT *ASN1_OBJECT_new(void)
 346 {
 347     ASN1_OBJECT *ret;
 348
 349     ret = OPENSSL_malloc(sizeof(ASN1_OBJECT));
 350     if (ret == NULL) {
 351         ASN1err(ASN1_F_ASN1_OBJECT_NEW, ERR_R_MALLOC_FAILURE);
 352         return (NULL);
 353     }
 354     ret->length = 0;
 355     ret->data = NULL;
 356     ret->nid = 0;
 357     ret->sn = NULL;
 358     ret->ln = NULL;
 359     ret->flags = ASN1_OBJECT_FLAG_DYNAMIC;
 360     return (ret);
 361 }
 362
 363 void ASN1_OBJECT_free(ASN1_OBJECT *a)
 364 {
 365     if (a == NULL)
 366         return;
 367     if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC_STRINGS) {
 368 #ifndef CONST_STRICT            /* disable purely for compile-time strict
 369                                  * const checking. Doing this on a "real"
 370                                  * compile will cause memory leaks */
 371         if (a->sn != NULL)
 372             OPENSSL_free((void *)a->sn);
 373         if (a->ln != NULL)
 374             OPENSSL_free((void *)a->ln);
 375 #endif
 376         a->sn = a->ln = NULL;
 377     }
 378     if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC_DATA) {
 379         if (a->data != NULL)
 380             OPENSSL_free((void *)a->data);
 381         a->data = NULL;
 382         a->length = 0;
 383     }
 384     if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC)
 385         OPENSSL_free(a);
 386 }
 387
 388 ASN1_OBJECT *ASN1_OBJECT_create(int nid, unsigned char *data, int len,
 389                                 const char *sn, const char *ln)
 390 {
 391     ASN1_OBJECT o;
 392
 393     o.sn = sn;
 394     o.ln = ln;
 395     o.data = data;
 396     o.nid = nid;
 397     o.length = len;
 398     o.flags = ASN1_OBJECT_FLAG_DYNAMIC | ASN1_OBJECT_FLAG_DYNAMIC_STRINGS |
 399         ASN1_OBJECT_FLAG_DYNAMIC_DATA;
 400     return (OBJ_dup(&o));
 401 }