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 0
 141     fprintf(stderr, "p=%d + *plength=%ld > omax=%ld + *pp=%d  (%d > %d)\n",
 142             (int)p, *plength, omax, (int)*pp, (int)(p + *plength),
 143             (int)(omax + *pp));
 144
 145 #endif
 146     if (*plength > (omax - (p - *pp))) {
 147         ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_TOO_LONG);
 148         /*
 149          * Set this so that even if things are not long enough the values are
 150          * set correctly
 151          */
 152         ret |= 0x80;
 153     }
 154     *pp = p;
 155     return (ret | inf);
 156  err:
 157     ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG);
 158     return (0x80);
 159 }
 160
 161 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
 162                            int max)
 163 {
 164     const unsigned char *p = *pp;
 165     unsigned long ret = 0;
 166     unsigned int i;
 167
 168     if (max-- < 1)
 169         return (0);
 170     if (*p == 0x80) {
 171         *inf = 1;
 172         ret = 0;
 173         p++;
 174     } else {
 175         *inf = 0;
 176         i = *p & 0x7f;
 177         if (*(p++) & 0x80) {
 178             if (max < (int)i)
 179                 return 0;
 180             /* Skip leading zeroes */
 181             while (i && *p == 0) {
 182                 p++;
 183                 i--;
 184             }
 185             if (i > sizeof(long))
 186                 return 0;
 187             while (i-- > 0) {
 188                 ret <<= 8L;
 189                 ret |= *(p++);
 190             }
 191         } else
 192             ret = i;
 193     }
 194     if (ret > LONG_MAX)
 195         return 0;
 196     *pp = p;
 197     *rl = (long)ret;
 198     return (1);
 199 }
 200
 201 /*
 202  * class 0 is constructed constructed == 2 for indefinite length constructed
 203  */
 204 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
 205                      int xclass)
 206 {
 207     unsigned char *p = *pp;
 208     int i, ttag;
 209
 210     i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
 211     i |= (xclass & V_ASN1_PRIVATE);
 212     if (tag < 31)
 213         *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG);
 214     else {
 215         *(p++) = i | V_ASN1_PRIMITIVE_TAG;
 216         for (i = 0, ttag = tag; ttag > 0; i++)
 217             ttag >>= 7;
 218         ttag = i;
 219         while (i-- > 0) {
 220             p[i] = tag & 0x7f;
 221             if (i != (ttag - 1))
 222                 p[i] |= 0x80;
 223             tag >>= 7;
 224         }
 225         p += ttag;
 226     }
 227     if (constructed == 2)
 228         *(p++) = 0x80;
 229     else
 230         asn1_put_length(&p, length);
 231     *pp = p;
 232 }
 233
 234 int ASN1_put_eoc(unsigned char **pp)
 235 {
 236     unsigned char *p = *pp;
 237     *p++ = 0;
 238     *p++ = 0;
 239     *pp = p;
 240     return 2;
 241 }
 242
 243 static void asn1_put_length(unsigned char **pp, int length)
 244 {
 245     unsigned char *p = *pp;
 246     int i, l;
 247     if (length <= 127)
 248         *(p++) = (unsigned char)length;
 249     else {
 250         l = length;
 251         for (i = 0; l > 0; i++)
 252             l >>= 8;
 253         *(p++) = i | 0x80;
 254         l = i;
 255         while (i-- > 0) {
 256             p[i] = length & 0xff;
 257             length >>= 8;
 258         }
 259         p += l;
 260     }
 261     *pp = p;
 262 }
 263
 264 int ASN1_object_size(int constructed, int length, int tag)
 265 {
 266     int ret;
 267
 268     ret = length;
 269     ret++;
 270     if (tag >= 31) {
 271         while (tag > 0) {
 272             tag >>= 7;
 273             ret++;
 274         }
 275     }
 276     if (constructed == 2)
 277         return ret + 3;
 278     ret++;
 279     if (length > 127) {
 280         while (length > 0) {
 281             length >>= 8;
 282             ret++;
 283         }
 284     }
 285     return (ret);
 286 }
 287
 288 static int _asn1_Finish(ASN1_const_CTX *c)
 289 {
 290     if ((c->inf == (1 | V_ASN1_CONSTRUCTED)) && (!c->eos)) {
 291         if (!ASN1_const_check_infinite_end(&c->p, c->slen)) {
 292             c->error = ERR_R_MISSING_ASN1_EOS;
 293             return (0);
 294         }
 295     }
 296     if (((c->slen != 0) && !(c->inf & 1)) || ((c->slen < 0) && (c->inf & 1))) {
 297         c->error = ERR_R_ASN1_LENGTH_MISMATCH;
 298         return (0);
 299     }
 300     return (1);
 301 }
 302
 303 int asn1_Finish(ASN1_CTX *c)
 304 {
 305     return _asn1_Finish((ASN1_const_CTX *)c);
 306 }
 307
 308 int asn1_const_Finish(ASN1_const_CTX *c)
 309 {
 310     return _asn1_Finish(c);
 311 }
 312
 313 int asn1_GetSequence(ASN1_const_CTX *c, long *length)
 314 {
 315     const unsigned char *q;
 316
 317     q = c->p;
 318     c->inf = ASN1_get_object(&(c->p), &(c->slen), &(c->tag), &(c->xclass),
 319                              *length);
 320     if (c->inf & 0x80) {
 321         c->error = ERR_R_BAD_GET_ASN1_OBJECT_CALL;
 322         return (0);
 323     }
 324     if (c->tag != V_ASN1_SEQUENCE) {
 325         c->error = ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
 326         return (0);
 327     }
 328     (*length) -= (c->p - q);
 329     if (c->max && (*length < 0)) {
 330         c->error = ERR_R_ASN1_LENGTH_MISMATCH;
 331         return (0);
 332     }
 333     if (c->inf == (1 | V_ASN1_CONSTRUCTED))
 334         c->slen = *length + *(c->pp) - c->p;
 335     c->eos = 0;
 336     return (1);
 337 }
 338
 339 int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
 340 {
 341     if (str == NULL)
 342         return 0;
 343     dst->type = str->type;
 344     if (!ASN1_STRING_set(dst, str->data, str->length))
 345         return 0;
 346     dst->flags = str->flags;
 347     return 1;
 348 }
 349
 350 ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
 351 {
 352     ASN1_STRING *ret;
 353     if (!str)
 354         return NULL;
 355     ret = ASN1_STRING_new();
 356     if (!ret)
 357         return NULL;
 358     if (!ASN1_STRING_copy(ret, str)) {
 359         ASN1_STRING_free(ret);
 360         return NULL;
 361     }
 362     return ret;
 363 }
 364
 365 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
 366 {
 367     unsigned char *c;
 368     const char *data = _data;
 369
 370     if (len < 0) {
 371         if (data == NULL)
 372             return (0);
 373         else
 374             len = strlen(data);
 375     }
 376     if ((str->length < len) || (str->data == NULL)) {
 377         c = str->data;
 378         if (c == NULL)
 379             str->data = OPENSSL_malloc(len + 1);
 380         else
 381             str->data = OPENSSL_realloc(c, len + 1);
 382
 383         if (str->data == NULL) {
 384             ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE);
 385             str->data = c;
 386             return (0);
 387         }
 388     }
 389     str->length = len;
 390     if (data != NULL) {
 391         memcpy(str->data, data, len);
 392         /* an allowance for strings :-) */
 393         str->data[len] = '\0';
 394     }
 395     return (1);
 396 }
 397
 398 void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
 399 {
 400     if (str->data)
 401         OPENSSL_free(str->data);
 402     str->data = data;
 403     str->length = len;
 404 }
 405
 406 ASN1_STRING *ASN1_STRING_new(void)
 407 {
 408     return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
 409 }
 410
 411 ASN1_STRING *ASN1_STRING_type_new(int type)
 412 {
 413     ASN1_STRING *ret;
 414
 415     ret = (ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
 416     if (ret == NULL) {
 417         ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE);
 418         return (NULL);
 419     }
 420     ret->length = 0;
 421     ret->type = type;
 422     ret->data = NULL;
 423     ret->flags = 0;
 424     return (ret);
 425 }
 426
 427 void ASN1_STRING_free(ASN1_STRING *a)
 428 {
 429     if (a == NULL)
 430         return;
 431     if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
 432         OPENSSL_free(a->data);
 433     OPENSSL_free(a);
 434 }
 435
 436 int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
 437 {
 438     int i;
 439
 440     i = (a->length - b->length);
 441     if (i == 0) {
 442         i = memcmp(a->data, b->data, a->length);
 443         if (i == 0)
 444             return (a->type - b->type);
 445         else
 446             return (i);
 447     } else
 448         return (i);
 449 }
 450
 451 void asn1_add_error(const unsigned char *address, int offset)
 452 {
 453     char buf1[DECIMAL_SIZE(address) + 1], buf2[DECIMAL_SIZE(offset) + 1];
 454
 455     BIO_snprintf(buf1, sizeof buf1, "%lu", (unsigned long)address);
 456     BIO_snprintf(buf2, sizeof buf2, "%d", offset);
 457     ERR_add_error_data(4, "address=", buf1, " offset=", buf2);
 458 }
 459
 460 int ASN1_STRING_length(const ASN1_STRING *x)
 461 {
 462     return M_ASN1_STRING_length(x);
 463 }
 464
 465 void ASN1_STRING_length_set(ASN1_STRING *x, int len)
 466 {
 467     M_ASN1_STRING_length_set(x, len);
 468     return;
 469 }
 470
 471 int ASN1_STRING_type(ASN1_STRING *x)
 472 {
 473     return M_ASN1_STRING_type(x);
 474 }
 475
 476 unsigned char *ASN1_STRING_data(ASN1_STRING *x)
 477 {
 478     return M_ASN1_STRING_data(x);
 479 }