crypto/libressl/crypto/asn1/a_set.c

   1 /* $OpenBSD: a_set.c,v 1.16 2014/07/11 08:44:47 jsing Exp $ */
   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 <string.h>
  61
  62 #include <openssl/asn1_mac.h>
  63 #include <openssl/err.h>
  64
  65 #ifndef NO_ASN1_OLD
  66
  67 typedef struct {
  68         unsigned char *pbData;
  69         int cbData;
  70 } MYBLOB;
  71
  72 /* SetBlobCmp
  73  * This function compares two elements of SET_OF block
  74  */
  75 static int
  76 SetBlobCmp(const void *elem1, const void *elem2)
  77 {
  78         const MYBLOB *b1 = (const MYBLOB *)elem1;
  79         const MYBLOB *b2 = (const MYBLOB *)elem2;
  80         int r;
  81
  82         r = memcmp(b1->pbData, b2->pbData,
  83             b1->cbData < b2->cbData ? b1->cbData : b2->cbData);
  84         if (r != 0)
  85                 return r;
  86         return b1->cbData - b2->cbData;
  87 }
  88
  89 /* int is_set:  if TRUE, then sort the contents (i.e. it isn't a SEQUENCE) */
  90 int
  91 i2d_ASN1_SET(STACK_OF(OPENSSL_BLOCK) *a, unsigned char **pp, i2d_of_void *i2d,
  92     int ex_tag, int ex_class, int is_set)
  93 {
  94         int ret = 0, r;
  95         int i;
  96         unsigned char *p;
  97         unsigned char *pStart, *pTempMem;
  98         MYBLOB *rgSetBlob;
  99         int totSize;
 100
 101         if (a == NULL)
 102                 return 0;
 103         for (i = sk_OPENSSL_BLOCK_num(a) - 1; i >= 0; i--)
 104                 ret += i2d(sk_OPENSSL_BLOCK_value(a, i), NULL);
 105         r = ASN1_object_size(1, ret, ex_tag);
 106         if (pp == NULL)
 107                 return r;
 108
 109         p = *pp;
 110         ASN1_put_object(&p, 1, ret, ex_tag, ex_class);
 111
 112         /* Modified by gp@nsj.co.jp */
 113         /* And then again by Ben */
 114         /* And again by Steve */
 115
 116         if (!is_set || (sk_OPENSSL_BLOCK_num(a) < 2)) {
 117                 for (i = 0; i < sk_OPENSSL_BLOCK_num(a); i++)
 118                         i2d(sk_OPENSSL_BLOCK_value(a, i), &p);
 119
 120                 *pp = p;
 121                 return r;
 122         }
 123
 124         pStart  = p;    /* Catch the beg of Setblobs*/
 125         /* In this array we will store the SET blobs */
 126         rgSetBlob = reallocarray(NULL, sk_OPENSSL_BLOCK_num(a), sizeof(MYBLOB));
 127         if (rgSetBlob == NULL) {
 128                 ASN1err(ASN1_F_I2D_ASN1_SET, ERR_R_MALLOC_FAILURE);
 129                 return 0;
 130         }
 131
 132         for (i = 0; i < sk_OPENSSL_BLOCK_num(a); i++) {
 133                 rgSetBlob[i].pbData = p;        /* catch each set encode blob */
 134                 i2d(sk_OPENSSL_BLOCK_value(a, i), &p);
 135                 /* Length of this SetBlob */
 136                 rgSetBlob[i].cbData = p - rgSetBlob[i].pbData;
 137         }
 138         *pp = p;
 139         totSize = p - pStart;   /* This is the total size of all set blobs */
 140
 141         /* Now we have to sort the blobs. I am using a simple algo.
 142          * Sort ptrs
 143          * Copy to temp-mem
 144          * Copy from temp-mem to user-mem
 145          */
 146         qsort(rgSetBlob, sk_OPENSSL_BLOCK_num(a), sizeof(MYBLOB), SetBlobCmp);
 147         if ((pTempMem = malloc(totSize)) == NULL) {
 148                 free(rgSetBlob);
 149                 ASN1err(ASN1_F_I2D_ASN1_SET, ERR_R_MALLOC_FAILURE);
 150                 return 0;
 151         }
 152
 153         /* Copy to temp mem */
 154         p = pTempMem;
 155         for (i = 0; i < sk_OPENSSL_BLOCK_num(a); ++i) {
 156                 memcpy(p, rgSetBlob[i].pbData, rgSetBlob[i].cbData);
 157                 p += rgSetBlob[i].cbData;
 158         }
 159
 160         /* Copy back to user mem*/
 161         memcpy(pStart, pTempMem, totSize);
 162         free(pTempMem);
 163         free(rgSetBlob);
 164
 165         return r;
 166 }
 167
 168 STACK_OF(OPENSSL_BLOCK) *
 169 d2i_ASN1_SET(STACK_OF(OPENSSL_BLOCK) **a, const unsigned char **pp, long length,
 170     d2i_of_void *d2i, void (*free_func)(OPENSSL_BLOCK), int ex_tag,
 171     int ex_class)
 172 {
 173         ASN1_const_CTX c;
 174         STACK_OF(OPENSSL_BLOCK) *ret = NULL;
 175
 176         if (a == NULL || (*a) == NULL) {
 177                 if ((ret = sk_OPENSSL_BLOCK_new_null()) == NULL) {
 178                         ASN1err(ASN1_F_D2I_ASN1_SET, ERR_R_MALLOC_FAILURE);
 179                         goto err;
 180                 }
 181         } else
 182                 ret = *a;
 183
 184         c.p = *pp;
 185         c.max = (length == 0) ? 0 : (c.p + length);
 186
 187         c.inf = ASN1_get_object(&c.p, &c.slen, &c.tag, &c.xclass, c.max - c.p);
 188         if (c.inf & 0x80)
 189                 goto err;
 190         if (ex_class != c.xclass) {
 191                 ASN1err(ASN1_F_D2I_ASN1_SET, ASN1_R_BAD_CLASS);
 192                 goto err;
 193         }
 194         if (ex_tag != c.tag) {
 195                 ASN1err(ASN1_F_D2I_ASN1_SET, ASN1_R_BAD_TAG);
 196                 goto err;
 197         }
 198         if (c.slen + c.p > c.max) {
 199                 ASN1err(ASN1_F_D2I_ASN1_SET, ASN1_R_LENGTH_ERROR);
 200                 goto err;
 201         }
 202         /* check for infinite constructed - it can be as long
 203          * as the amount of data passed to us */
 204         if (c.inf == (V_ASN1_CONSTRUCTED + 1))
 205                 c.slen = length + *pp - c.p;
 206         c.max = c.p + c.slen;
 207
 208         while (c.p < c.max) {
 209                 char *s;
 210
 211                 if (M_ASN1_D2I_end_sequence())
 212                         break;
 213                 if ((s = d2i(NULL, &c.p, c.slen)) == NULL) {
 214                         ASN1err(ASN1_F_D2I_ASN1_SET,
 215                             ASN1_R_ERROR_PARSING_SET_ELEMENT);
 216                         asn1_add_error(*pp, (int)(c.p - *pp));
 217                         goto err;
 218                 }
 219                 if (!sk_OPENSSL_BLOCK_push(ret, s))
 220                         goto err;
 221         }
 222         if (a != NULL)
 223                 *a = ret;
 224         *pp = c.p;
 225         return ret;
 226
 227 err:
 228         if (a == NULL || *a != ret) {
 229                 if (free_func != NULL)
 230                         sk_OPENSSL_BLOCK_pop_free(ret, free_func);
 231                 else
 232                         sk_OPENSSL_BLOCK_free(ret);
 233         }
 234         return NULL;
 235 }
 236
 237 #endif