crypto/asn1/a_object.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <limits.h>
  12 #include "crypto/ctype.h"
  13 #include "internal/cryptlib.h"
  14 #include <openssl/buffer.h>
  15 #include <openssl/asn1.h>
  16 #include <openssl/objects.h>
  17 #include <openssl/bn.h>
  18 #include "crypto/asn1.h"
  19 #include "asn1_local.h"
  20
  21 int i2d_ASN1_OBJECT(const ASN1_OBJECT *a, unsigned char **pp)
  22 {
  23     unsigned char *p, *allocated = NULL;
  24     int objsize;
  25
  26     if ((a == NULL) || (a->data == NULL))
  27         return 0;
  28
  29     objsize = ASN1_object_size(0, a->length, V_ASN1_OBJECT);
  30     if (pp == NULL || objsize == -1)
  31         return objsize;
  32
  33     if (*pp == NULL) {
  34         if ((p = allocated = OPENSSL_malloc(objsize)) == NULL) {
  35             ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
  36             return 0;
  37         }
  38     } else {
  39         p = *pp;
  40     }
  41
  42     ASN1_put_object(&p, 0, a->length, V_ASN1_OBJECT, V_ASN1_UNIVERSAL);
  43     memcpy(p, a->data, a->length);
  44
  45     /*
  46      * If a new buffer was allocated, just return it back.
  47      * If not, return the incremented buffer pointer.
  48      */
  49     *pp = allocated != NULL ? allocated : p + a->length;
  50     return objsize;
  51 }
  52
  53 int a2d_ASN1_OBJECT(unsigned char *out, int olen, const char *buf, int num)
  54 {
  55     int i, first, len = 0, c, use_bn;
  56     char ftmp[24], *tmp = ftmp;
  57     int tmpsize = sizeof(ftmp);
  58     const char *p;
  59     unsigned long l;
  60     BIGNUM *bl = NULL;
  61
  62     if (num == 0)
  63         return 0;
  64     else if (num == -1)
  65         num = strlen(buf);
  66
  67     p = buf;
  68     c = *(p++);
  69     num--;
  70     if ((c >= '0') && (c <= '2')) {
  71         first = c - '0';
  72     } else {
  73         ERR_raise(ERR_LIB_ASN1, ASN1_R_FIRST_NUM_TOO_LARGE);
  74         goto err;
  75     }
  76
  77     if (num <= 0) {
  78         ERR_raise(ERR_LIB_ASN1, ASN1_R_MISSING_SECOND_NUMBER);
  79         goto err;
  80     }
  81     c = *(p++);
  82     num--;
  83     for (;;) {
  84         if (num <= 0)
  85             break;
  86         if ((c != '.') && (c != ' ')) {
  87             ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_SEPARATOR);
  88             goto err;
  89         }
  90         l = 0;
  91         use_bn = 0;
  92         for (;;) {
  93             if (num <= 0)
  94                 break;
  95             num--;
  96             c = *(p++);
  97             if ((c == ' ') || (c == '.'))
  98                 break;
  99             if (!ossl_isdigit(c)) {
 100                 ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_DIGIT);
 101                 goto err;
 102             }
 103             if (!use_bn && l >= ((ULONG_MAX - 80) / 10L)) {
 104                 use_bn = 1;
 105                 if (bl == NULL)
 106                     bl = BN_new();
 107                 if (bl == NULL || !BN_set_word(bl, l))
 108                     goto err;
 109             }
 110             if (use_bn) {
 111                 if (!BN_mul_word(bl, 10L)
 112                     || !BN_add_word(bl, c - '0'))
 113                     goto err;
 114             } else
 115                 l = l * 10L + (long)(c - '0');
 116         }
 117         if (len == 0) {
 118             if ((first < 2) && (l >= 40)) {
 119                 ERR_raise(ERR_LIB_ASN1, ASN1_R_SECOND_NUMBER_TOO_LARGE);
 120                 goto err;
 121             }
 122             if (use_bn) {
 123                 if (!BN_add_word(bl, first * 40))
 124                     goto err;
 125             } else
 126                 l += (long)first *40;
 127         }
 128         i = 0;
 129         if (use_bn) {
 130             int blsize;
 131             blsize = BN_num_bits(bl);
 132             blsize = (blsize + 6) / 7;
 133             if (blsize > tmpsize) {
 134                 if (tmp != ftmp)
 135                     OPENSSL_free(tmp);
 136                 tmpsize = blsize + 32;
 137                 tmp = OPENSSL_malloc(tmpsize);
 138                 if (tmp == NULL)
 139                     goto err;
 140             }
 141             while (blsize--) {
 142                 BN_ULONG t = BN_div_word(bl, 0x80L);
 143                 if (t == (BN_ULONG)-1)
 144                     goto err;
 145                 tmp[i++] = (unsigned char)t;
 146             }
 147         } else {
 148
 149             for (;;) {
 150                 tmp[i++] = (unsigned char)l & 0x7f;
 151                 l >>= 7L;
 152                 if (l == 0L)
 153                     break;
 154             }
 155
 156         }
 157         if (out != NULL) {
 158             if (len + i > olen) {
 159                 ERR_raise(ERR_LIB_ASN1, ASN1_R_BUFFER_TOO_SMALL);
 160                 goto err;
 161             }
 162             while (--i > 0)
 163                 out[len++] = tmp[i] | 0x80;
 164             out[len++] = tmp[0];
 165         } else
 166             len += i;
 167     }
 168     if (tmp != ftmp)
 169         OPENSSL_free(tmp);
 170     BN_free(bl);
 171     return len;
 172  err:
 173     if (tmp != ftmp)
 174         OPENSSL_free(tmp);
 175     BN_free(bl);
 176     return 0;
 177 }
 178
 179 int i2t_ASN1_OBJECT(char *buf, int buf_len, const ASN1_OBJECT *a)
 180 {
 181     return OBJ_obj2txt(buf, buf_len, a, 0);
 182 }
 183
 184 int i2a_ASN1_OBJECT(BIO *bp, const ASN1_OBJECT *a)
 185 {
 186     char buf[80], *p = buf;
 187     int i;
 188
 189     if ((a == NULL) || (a->data == NULL))
 190         return BIO_write(bp, "NULL", 4);
 191     i = i2t_ASN1_OBJECT(buf, sizeof(buf), a);
 192     if (i > (int)(sizeof(buf) - 1)) {
 193         if ((p = OPENSSL_malloc(i + 1)) == NULL) {
 194             ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
 195             return -1;
 196         }
 197         i2t_ASN1_OBJECT(p, i + 1, a);
 198     }
 199     if (i <= 0) {
 200         i = BIO_write(bp, "<INVALID>", 9);
 201         i += BIO_dump(bp, (const char *)a->data, a->length);
 202         return i;
 203     }
 204     BIO_write(bp, p, i);
 205     if (p != buf)
 206         OPENSSL_free(p);
 207     return i;
 208 }
 209
 210 ASN1_OBJECT *d2i_ASN1_OBJECT(ASN1_OBJECT **a, const unsigned char **pp,
 211                              long length)
 212 {
 213     const unsigned char *p;
 214     long len;
 215     int tag, xclass;
 216     int inf, i;
 217     ASN1_OBJECT *ret = NULL;
 218     p = *pp;
 219     inf = ASN1_get_object(&p, &len, &tag, &xclass, length);
 220     if (inf & 0x80) {
 221         i = ASN1_R_BAD_OBJECT_HEADER;
 222         goto err;
 223     }
 224
 225     if (tag != V_ASN1_OBJECT) {
 226         i = ASN1_R_EXPECTING_AN_OBJECT;
 227         goto err;
 228     }
 229     ret = c2i_ASN1_OBJECT(a, &p, len);
 230     if (ret)
 231         *pp = p;
 232     return ret;
 233  err:
 234     ERR_raise(ERR_LIB_ASN1, i);
 235     return NULL;
 236 }
 237
 238 ASN1_OBJECT *c2i_ASN1_OBJECT(ASN1_OBJECT **a, const unsigned char **pp,
 239                              long len)
 240 {
 241     ASN1_OBJECT *ret = NULL, tobj;
 242     const unsigned char *p;
 243     unsigned char *data;
 244     int i, length;
 245
 246     /*
 247      * Sanity check OID encoding. Need at least one content octet. MSB must
 248      * be clear in the last octet. can't have leading 0x80 in subidentifiers,
 249      * see: X.690 8.19.2
 250      */
 251     if (len <= 0 || len > INT_MAX || pp == NULL || (p = *pp) == NULL ||
 252         p[len - 1] & 0x80) {
 253         ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_OBJECT_ENCODING);
 254         return NULL;
 255     }
 256     /* Now 0 < len <= INT_MAX, so the cast is safe. */
 257     length = (int)len;
 258     /*
 259      * Try to lookup OID in table: these are all valid encodings so if we get
 260      * a match we know the OID is valid.
 261      */
 262     tobj.nid = NID_undef;
 263     tobj.data = p;
 264     tobj.length = length;
 265     tobj.flags = 0;
 266     i = OBJ_obj2nid(&tobj);
 267     if (i != NID_undef) {
 268         /*
 269          * Return shared registered OID object: this improves efficiency
 270          * because we don't have to return a dynamically allocated OID
 271          * and NID lookups can use the cached value.
 272          */
 273         ret = OBJ_nid2obj(i);
 274         if (a) {
 275             ASN1_OBJECT_free(*a);
 276             *a = ret;
 277         }
 278         *pp += len;
 279         return ret;
 280     }
 281     for (i = 0; i < length; i++, p++) {
 282         if (*p == 0x80 && (!i || !(p[-1] & 0x80))) {
 283             ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_OBJECT_ENCODING);
 284             return NULL;
 285         }
 286     }
 287
 288     /*
 289      * only the ASN1_OBJECTs from the 'table' will have values for ->sn or
 290      * ->ln
 291      */
 292     if ((a == NULL) || ((*a) == NULL) ||
 293         !((*a)->flags & ASN1_OBJECT_FLAG_DYNAMIC)) {
 294         if ((ret = ASN1_OBJECT_new()) == NULL)
 295             return NULL;
 296     } else
 297         ret = (*a);
 298
 299     p = *pp;
 300     /* detach data from object */
 301     data = (unsigned char *)ret->data;
 302     ret->data = NULL;
 303     /* once detached we can change it */
 304     if ((data == NULL) || (ret->length < length)) {
 305         ret->length = 0;
 306         OPENSSL_free(data);
 307         data = OPENSSL_malloc(length);
 308         if (data == NULL) {
 309             i = ERR_R_MALLOC_FAILURE;
 310             goto err;
 311         }
 312         ret->flags |= ASN1_OBJECT_FLAG_DYNAMIC_DATA;
 313     }
 314     memcpy(data, p, length);
 315     /* reattach data to object, after which it remains const */
 316     ret->data = data;
 317     ret->length = length;
 318     ret->sn = NULL;
 319     ret->ln = NULL;
 320     /* ret->flags=ASN1_OBJECT_FLAG_DYNAMIC; we know it is dynamic */
 321     p += length;
 322
 323     if (a != NULL)
 324         (*a) = ret;
 325     *pp = p;
 326     return ret;
 327  err:
 328     ERR_raise(ERR_LIB_ASN1, i);
 329     if ((a == NULL) || (*a != ret))
 330         ASN1_OBJECT_free(ret);
 331     return NULL;
 332 }
 333
 334 ASN1_OBJECT *ASN1_OBJECT_new(void)
 335 {
 336     ASN1_OBJECT *ret;
 337
 338     ret = OPENSSL_zalloc(sizeof(*ret));
 339     if (ret == NULL) {
 340         ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
 341         return NULL;
 342     }
 343     ret->flags = ASN1_OBJECT_FLAG_DYNAMIC;
 344     return ret;
 345 }
 346
 347 void ASN1_OBJECT_free(ASN1_OBJECT *a)
 348 {
 349     if (a == NULL)
 350         return;
 351     if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC_STRINGS) {
 352 #ifndef CONST_STRICT            /* disable purely for compile-time strict
 353                                  * const checking. Doing this on a "real"
 354                                  * compile will cause memory leaks */
 355         OPENSSL_free((void*)a->sn);
 356         OPENSSL_free((void*)a->ln);
 357 #endif
 358         a->sn = a->ln = NULL;
 359     }
 360     if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC_DATA) {
 361         OPENSSL_free((void*)a->data);
 362         a->data = NULL;
 363         a->length = 0;
 364     }
 365     if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC)
 366         OPENSSL_free(a);
 367 }
 368
 369 ASN1_OBJECT *ASN1_OBJECT_create(int nid, unsigned char *data, int len,
 370                                 const char *sn, const char *ln)
 371 {
 372     ASN1_OBJECT o;
 373
 374     o.sn = sn;
 375     o.ln = ln;
 376     o.data = data;
 377     o.nid = nid;
 378     o.length = len;
 379     o.flags = ASN1_OBJECT_FLAG_DYNAMIC | ASN1_OBJECT_FLAG_DYNAMIC_STRINGS |
 380         ASN1_OBJECT_FLAG_DYNAMIC_DATA;
 381     return OBJ_dup(&o);
 382 }