crypto/asn1/asn1_lib.c

   1 /* crypto/asn1/asn1_lib.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/asn1.h>
  63 #include <openssl/asn1_mac.h>
  64
  65 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
  66                            int max);
  67 static void asn1_put_length(unsigned char **pp, int length);
  68 const char ASN1_version[] = "ASN.1" OPENSSL_VERSION_PTEXT;
  69
  70 static int _asn1_check_infinite_end(const unsigned char **p, long len)
  71 {
  72     /*
  73      * If there is 0 or 1 byte left, the length check should pick things up
  74      */
  75     if (len <= 0)
  76         return (1);
  77     else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) {
  78         (*p) += 2;
  79         return (1);
  80     }
  81     return (0);
  82 }
  83
  84 int ASN1_check_infinite_end(unsigned char **p, long len)
  85 {
  86     return _asn1_check_infinite_end((const unsigned char **)p, len);
  87 }
  88
  89 int ASN1_const_check_infinite_end(const unsigned char **p, long len)
  90 {
  91     return _asn1_check_infinite_end(p, len);
  92 }
  93
  94 int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
  95                     int *pclass, long omax)
  96 {
  97     int i, ret;
  98     long l;
  99     const unsigned char *p = *pp;
 100     int tag, xclass, inf;
 101     long max = omax;
 102
 103     if (!max)
 104         goto err;
 105     ret = (*p & V_ASN1_CONSTRUCTED);
 106     xclass = (*p & V_ASN1_PRIVATE);
 107     i = *p & V_ASN1_PRIMITIVE_TAG;
 108     if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
 109         p++;
 110         if (--max == 0)
 111             goto err;
 112         l = 0;
 113         while (*p & 0x80) {
 114             l <<= 7L;
 115             l |= *(p++) & 0x7f;
 116             if (--max == 0)
 117                 goto err;
 118             if (l > (INT_MAX >> 7L))
 119                 goto err;
 120         }
 121         l <<= 7L;
 122         l |= *(p++) & 0x7f;
 123         tag = (int)l;
 124         if (--max == 0)
 125             goto err;
 126     } else {
 127         tag = i;
 128         p++;
 129         if (--max == 0)
 130             goto err;
 131     }
 132     *ptag = tag;
 133     *pclass = xclass;
 134     if (!asn1_get_length(&p, &inf, plength, (int)max))
 135         goto err;
 136
 137     if (inf && !(ret & V_ASN1_CONSTRUCTED))
 138         goto err;
 139
 140     if (*plength > (omax - (p - *pp))) {
 141         ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_TOO_LONG);
 142         /*
 143          * Set this so that even if things are not long enough the values are
 144          * set correctly
 145          */
 146         ret |= 0x80;
 147     }
 148     *pp = p;
 149     return (ret | inf);
 150  err:
 151     ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG);
 152     return (0x80);
 153 }
 154
 155 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
 156                            int max)
 157 {
 158     const unsigned char *p = *pp;
 159     unsigned long ret = 0;
 160     unsigned int i;
 161
 162     if (max-- < 1)
 163         return (0);
 164     if (*p == 0x80) {
 165         *inf = 1;
 166         ret = 0;
 167         p++;
 168     } else {
 169         *inf = 0;
 170         i = *p & 0x7f;
 171         if (*(p++) & 0x80) {
 172             if (max < (int)i)
 173                 return 0;
 174             /* Skip leading zeroes */
 175             while (i && *p == 0) {
 176                 p++;
 177                 i--;
 178             }
 179             if (i > sizeof(long))
 180                 return 0;
 181             while (i-- > 0) {
 182                 ret <<= 8L;
 183                 ret |= *(p++);
 184             }
 185         } else
 186             ret = i;
 187     }
 188     if (ret > LONG_MAX)
 189         return 0;
 190     *pp = p;
 191     *rl = (long)ret;
 192     return (1);
 193 }
 194
 195 /*
 196  * class 0 is constructed constructed == 2 for indefinite length constructed
 197  */
 198 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
 199                      int xclass)
 200 {
 201     unsigned char *p = *pp;
 202     int i, ttag;
 203
 204     i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
 205     i |= (xclass & V_ASN1_PRIVATE);
 206     if (tag < 31)
 207         *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG);
 208     else {
 209         *(p++) = i | V_ASN1_PRIMITIVE_TAG;
 210         for (i = 0, ttag = tag; ttag > 0; i++)
 211             ttag >>= 7;
 212         ttag = i;
 213         while (i-- > 0) {
 214             p[i] = tag & 0x7f;
 215             if (i != (ttag - 1))
 216                 p[i] |= 0x80;
 217             tag >>= 7;
 218         }
 219         p += ttag;
 220     }
 221     if (constructed == 2)
 222         *(p++) = 0x80;
 223     else
 224         asn1_put_length(&p, length);
 225     *pp = p;
 226 }
 227
 228 int ASN1_put_eoc(unsigned char **pp)
 229 {
 230     unsigned char *p = *pp;
 231     *p++ = 0;
 232     *p++ = 0;
 233     *pp = p;
 234     return 2;
 235 }
 236
 237 static void asn1_put_length(unsigned char **pp, int length)
 238 {
 239     unsigned char *p = *pp;
 240     int i, l;
 241     if (length <= 127)
 242         *(p++) = (unsigned char)length;
 243     else {
 244         l = length;
 245         for (i = 0; l > 0; i++)
 246             l >>= 8;
 247         *(p++) = i | 0x80;
 248         l = i;
 249         while (i-- > 0) {
 250             p[i] = length & 0xff;
 251             length >>= 8;
 252         }
 253         p += l;
 254     }
 255     *pp = p;
 256 }
 257
 258 int ASN1_object_size(int constructed, int length, int tag)
 259 {
 260     int ret;
 261
 262     ret = length;
 263     ret++;
 264     if (tag >= 31) {
 265         while (tag > 0) {
 266             tag >>= 7;
 267             ret++;
 268         }
 269     }
 270     if (constructed == 2)
 271         return ret + 3;
 272     ret++;
 273     if (length > 127) {
 274         while (length > 0) {
 275             length >>= 8;
 276             ret++;
 277         }
 278     }
 279     return (ret);
 280 }
 281
 282 static int _asn1_Finish(ASN1_const_CTX *c)
 283 {
 284     if ((c->inf == (1 | V_ASN1_CONSTRUCTED)) && (!c->eos)) {
 285         if (!ASN1_const_check_infinite_end(&c->p, c->slen)) {
 286             c->error = ERR_R_MISSING_ASN1_EOS;
 287             return (0);
 288         }
 289     }
 290     if (((c->slen != 0) && !(c->inf & 1)) || ((c->slen < 0) && (c->inf & 1))) {
 291         c->error = ERR_R_ASN1_LENGTH_MISMATCH;
 292         return (0);
 293     }
 294     return (1);
 295 }
 296
 297 int asn1_Finish(ASN1_CTX *c)
 298 {
 299     return _asn1_Finish((ASN1_const_CTX *)c);
 300 }
 301
 302 int asn1_const_Finish(ASN1_const_CTX *c)
 303 {
 304     return _asn1_Finish(c);
 305 }
 306
 307 int asn1_GetSequence(ASN1_const_CTX *c, long *length)
 308 {
 309     const unsigned char *q;
 310
 311     q = c->p;
 312     c->inf = ASN1_get_object(&(c->p), &(c->slen), &(c->tag), &(c->xclass),
 313                              *length);
 314     if (c->inf & 0x80) {
 315         c->error = ERR_R_BAD_GET_ASN1_OBJECT_CALL;
 316         return (0);
 317     }
 318     if (c->tag != V_ASN1_SEQUENCE) {
 319         c->error = ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
 320         return (0);
 321     }
 322     (*length) -= (c->p - q);
 323     if (c->max && (*length < 0)) {
 324         c->error = ERR_R_ASN1_LENGTH_MISMATCH;
 325         return (0);
 326     }
 327     if (c->inf == (1 | V_ASN1_CONSTRUCTED))
 328         c->slen = *length + *(c->pp) - c->p;
 329     c->eos = 0;
 330     return (1);
 331 }
 332
 333 int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
 334 {
 335     if (str == NULL)
 336         return 0;
 337     dst->type = str->type;
 338     if (!ASN1_STRING_set(dst, str->data, str->length))
 339         return 0;
 340     dst->flags = str->flags;
 341     return 1;
 342 }
 343
 344 ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
 345 {
 346     ASN1_STRING *ret;
 347     if (!str)
 348         return NULL;
 349     ret = ASN1_STRING_new();
 350     if (!ret)
 351         return NULL;
 352     if (!ASN1_STRING_copy(ret, str)) {
 353         ASN1_STRING_free(ret);
 354         return NULL;
 355     }
 356     return ret;
 357 }
 358
 359 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
 360 {
 361     unsigned char *c;
 362     const char *data = _data;
 363
 364     if (len < 0) {
 365         if (data == NULL)
 366             return (0);
 367         else
 368             len = strlen(data);
 369     }
 370     if ((str->length < len) || (str->data == NULL)) {
 371         c = str->data;
 372         if (c == NULL)
 373             str->data = OPENSSL_malloc(len + 1);
 374         else
 375             str->data = OPENSSL_realloc(c, len + 1);
 376
 377         if (str->data == NULL) {
 378             ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE);
 379             str->data = c;
 380             return (0);
 381         }
 382     }
 383     str->length = len;
 384     if (data != NULL) {
 385         memcpy(str->data, data, len);
 386         /* an allowance for strings :-) */
 387         str->data[len] = '\0';
 388     }
 389     return (1);
 390 }
 391
 392 void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
 393 {
 394     if (str->data)
 395         OPENSSL_free(str->data);
 396     str->data = data;
 397     str->length = len;
 398 }
 399
 400 ASN1_STRING *ASN1_STRING_new(void)
 401 {
 402     return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
 403 }
 404
 405 ASN1_STRING *ASN1_STRING_type_new(int type)
 406 {
 407     ASN1_STRING *ret;
 408
 409     ret = (ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
 410     if (ret == NULL) {
 411         ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE);
 412         return (NULL);
 413     }
 414     ret->length = 0;
 415     ret->type = type;
 416     ret->data = NULL;
 417     ret->flags = 0;
 418     return (ret);
 419 }
 420
 421 void ASN1_STRING_free(ASN1_STRING *a)
 422 {
 423     if (a == NULL)
 424         return;
 425     if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
 426         OPENSSL_free(a->data);
 427     OPENSSL_free(a);
 428 }
 429
 430 void ASN1_STRING_clear_free(ASN1_STRING *a)
 431 {
 432     if (a && a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
 433         OPENSSL_cleanse(a->data, a->length);
 434     ASN1_STRING_free(a);
 435 }
 436
 437 int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
 438 {
 439     int i;
 440
 441     i = (a->length - b->length);
 442     if (i == 0) {
 443         i = memcmp(a->data, b->data, a->length);
 444         if (i == 0)
 445             return (a->type - b->type);
 446         else
 447             return (i);
 448     } else
 449         return (i);
 450 }
 451
 452 void asn1_add_error(const unsigned char *address, int offset)
 453 {
 454     char buf1[DECIMAL_SIZE(address) + 1], buf2[DECIMAL_SIZE(offset) + 1];
 455
 456     BIO_snprintf(buf1, sizeof buf1, "%lu", (unsigned long)address);
 457     BIO_snprintf(buf2, sizeof buf2, "%d", offset);
 458     ERR_add_error_data(4, "address=", buf1, " offset=", buf2);
 459 }
 460
 461 int ASN1_STRING_length(const ASN1_STRING *x)
 462 {
 463     return x->length;
 464 }
 465
 466 void ASN1_STRING_length_set(ASN1_STRING *x, int len)
 467 {
 468     x->length = len;
 469 }
 470
 471 int ASN1_STRING_type(ASN1_STRING *x)
 472 {
 473     return x->type;
 474 }
 475
 476 unsigned char *ASN1_STRING_data(ASN1_STRING *x)
 477 {
 478     return x->data;
 479 }