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