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             ASN1err(ASN1_F_I2D_ASN1_OBJECT, 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         ASN1err(ASN1_F_A2D_ASN1_OBJECT, ASN1_R_FIRST_NUM_TOO_LARGE);
  74         goto err;
  75     }
  76
  77     if (num <= 0) {
  78         ASN1err(ASN1_F_A2D_ASN1_OBJECT, 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             ASN1err(ASN1_F_A2D_ASN1_OBJECT, 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                 ASN1err(ASN1_F_A2D_ASN1_OBJECT, 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                 ASN1err(ASN1_F_A2D_ASN1_OBJECT,
 120                         ASN1_R_SECOND_NUMBER_TOO_LARGE);
 121                 goto err;
 122             }
 123             if (use_bn) {
 124                 if (!BN_add_word(bl, first * 40))
 125                     goto err;
 126             } else
 127                 l += (long)first *40;
 128         }
 129         i = 0;
 130         if (use_bn) {
 131             int blsize;
 132             blsize = BN_num_bits(bl);
 133             blsize = (blsize + 6) / 7;
 134             if (blsize > tmpsize) {
 135                 if (tmp != ftmp)
 136                     OPENSSL_free(tmp);
 137                 tmpsize = blsize + 32;
 138                 tmp = OPENSSL_malloc(tmpsize);
 139                 if (tmp == NULL)
 140                     goto err;
 141             }
 142             while (blsize--) {
 143                 BN_ULONG t = BN_div_word(bl, 0x80L);
 144                 if (t == (BN_ULONG)-1)
 145                     goto err;
 146                 tmp[i++] = (unsigned char)t;
 147             }
 148         } else {
 149
 150             for (;;) {
 151                 tmp[i++] = (unsigned char)l & 0x7f;
 152                 l >>= 7L;
 153                 if (l == 0L)
 154                     break;
 155             }
 156
 157         }
 158         if (out != NULL) {
 159             if (len + i > olen) {
 160                 ASN1err(ASN1_F_A2D_ASN1_OBJECT, ASN1_R_BUFFER_TOO_SMALL);
 161                 goto err;
 162             }
 163             while (--i > 0)
 164                 out[len++] = tmp[i] | 0x80;
 165             out[len++] = tmp[0];
 166         } else
 167             len += i;
 168     }
 169     if (tmp != ftmp)
 170         OPENSSL_free(tmp);
 171     BN_free(bl);
 172     return len;
 173  err:
 174     if (tmp != ftmp)
 175         OPENSSL_free(tmp);
 176     BN_free(bl);
 177     return 0;
 178 }
 179
 180 int i2t_ASN1_OBJECT(char *buf, int buf_len, const ASN1_OBJECT *a)
 181 {
 182     return OBJ_obj2txt(buf, buf_len, a, 0);
 183 }
 184
 185 int i2a_ASN1_OBJECT(BIO *bp, const ASN1_OBJECT *a)
 186 {
 187     char buf[80], *p = buf;
 188     int i;
 189
 190     if ((a == NULL) || (a->data == NULL))
 191         return BIO_write(bp, "NULL", 4);
 192     i = i2t_ASN1_OBJECT(buf, sizeof(buf), a);
 193     if (i > (int)(sizeof(buf) - 1)) {
 194         if ((p = OPENSSL_malloc(i + 1)) == NULL) {
 195             ASN1err(ASN1_F_I2A_ASN1_OBJECT, ERR_R_MALLOC_FAILURE);
 196             return -1;
 197         }
 198         i2t_ASN1_OBJECT(p, i + 1, a);
 199     }
 200     if (i <= 0) {
 201         i = BIO_write(bp, "<INVALID>", 9);
 202         i += BIO_dump(bp, (const char *)a->data, a->length);
 203         return i;
 204     }
 205     BIO_write(bp, p, i);
 206     if (p != buf)
 207         OPENSSL_free(p);
 208     return i;
 209 }
 210
 211 ASN1_OBJECT *d2i_ASN1_OBJECT(ASN1_OBJECT **a, const unsigned char **pp,
 212                              long length)
 213 {
 214     const unsigned char *p;
 215     long len;
 216     int tag, xclass;
 217     int inf, i;
 218     ASN1_OBJECT *ret = NULL;
 219     p = *pp;
 220     inf = ASN1_get_object(&p, &len, &tag, &xclass, length);
 221     if (inf & 0x80) {
 222         i = ASN1_R_BAD_OBJECT_HEADER;
 223         goto err;
 224     }
 225
 226     if (tag != V_ASN1_OBJECT) {
 227         i = ASN1_R_EXPECTING_AN_OBJECT;
 228         goto err;
 229     }
 230     ret = c2i_ASN1_OBJECT(a, &p, len);
 231     if (ret)
 232         *pp = p;
 233     return ret;
 234  err:
 235     ASN1err(ASN1_F_D2I_ASN1_OBJECT, i);
 236     return NULL;
 237 }
 238
 239 ASN1_OBJECT *c2i_ASN1_OBJECT(ASN1_OBJECT **a, const unsigned char **pp,
 240                              long len)
 241 {
 242     ASN1_OBJECT *ret = NULL, tobj;
 243     const unsigned char *p;
 244     unsigned char *data;
 245     int i, length;
 246
 247     /*
 248      * Sanity check OID encoding. Need at least one content octet. MSB must
 249      * be clear in the last octet. can't have leading 0x80 in subidentifiers,
 250      * see: X.690 8.19.2
 251      */
 252     if (len <= 0 || len > INT_MAX || pp == NULL || (p = *pp) == NULL ||
 253         p[len - 1] & 0x80) {
 254         ASN1err(ASN1_F_C2I_ASN1_OBJECT, ASN1_R_INVALID_OBJECT_ENCODING);
 255         return NULL;
 256     }
 257     /* Now 0 < len <= INT_MAX, so the cast is safe. */
 258     length = (int)len;
 259     /*
 260      * Try to lookup OID in table: these are all valid encodings so if we get
 261      * a match we know the OID is valid.
 262      */
 263     tobj.nid = NID_undef;
 264     tobj.data = p;
 265     tobj.length = length;
 266     tobj.flags = 0;
 267     i = OBJ_obj2nid(&tobj);
 268     if (i != NID_undef) {
 269         /*
 270          * Return shared registered OID object: this improves efficiency
 271          * because we don't have to return a dynamically allocated OID
 272          * and NID lookups can use the cached value.
 273          */
 274         ret = OBJ_nid2obj(i);
 275         if (a) {
 276             ASN1_OBJECT_free(*a);
 277             *a = ret;
 278         }
 279         *pp += len;
 280         return ret;
 281     }
 282     for (i = 0; i < length; i++, p++) {
 283         if (*p == 0x80 && (!i || !(p[-1] & 0x80))) {
 284             ASN1err(ASN1_F_C2I_ASN1_OBJECT, ASN1_R_INVALID_OBJECT_ENCODING);
 285             return NULL;
 286         }
 287     }
 288
 289     /*
 290      * only the ASN1_OBJECTs from the 'table' will have values for ->sn or
 291      * ->ln
 292      */
 293     if ((a == NULL) || ((*a) == NULL) ||
 294         !((*a)->flags & ASN1_OBJECT_FLAG_DYNAMIC)) {
 295         if ((ret = ASN1_OBJECT_new()) == NULL)
 296             return NULL;
 297     } else
 298         ret = (*a);
 299
 300     p = *pp;
 301     /* detach data from object */
 302     data = (unsigned char *)ret->data;
 303     ret->data = NULL;
 304     /* once detached we can change it */
 305     if ((data == NULL) || (ret->length < length)) {
 306         ret->length = 0;
 307         OPENSSL_free(data);
 308         data = OPENSSL_malloc(length);
 309         if (data == NULL) {
 310             i = ERR_R_MALLOC_FAILURE;
 311             goto err;
 312         }
 313         ret->flags |= ASN1_OBJECT_FLAG_DYNAMIC_DATA;
 314     }
 315     memcpy(data, p, length);
 316     /* reattach data to object, after which it remains const */
 317     ret->data = data;
 318     ret->length = length;
 319     ret->sn = NULL;
 320     ret->ln = NULL;
 321     /* ret->flags=ASN1_OBJECT_FLAG_DYNAMIC; we know it is dynamic */
 322     p += length;
 323
 324     if (a != NULL)
 325         (*a) = ret;
 326     *pp = p;
 327     return ret;
 328  err:
 329     ASN1err(ASN1_F_C2I_ASN1_OBJECT, i);
 330     if ((a == NULL) || (*a != ret))
 331         ASN1_OBJECT_free(ret);
 332     return NULL;
 333 }
 334
 335 ASN1_OBJECT *ASN1_OBJECT_new(void)
 336 {
 337     ASN1_OBJECT *ret;
 338
 339     ret = OPENSSL_zalloc(sizeof(*ret));
 340     if (ret == NULL) {
 341         ASN1err(ASN1_F_ASN1_OBJECT_NEW, ERR_R_MALLOC_FAILURE);
 342         return NULL;
 343     }
 344     ret->flags = ASN1_OBJECT_FLAG_DYNAMIC;
 345     return ret;
 346 }
 347
 348 void ASN1_OBJECT_free(ASN1_OBJECT *a)
 349 {
 350     if (a == NULL)
 351         return;
 352     if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC_STRINGS) {
 353 #ifndef CONST_STRICT            /* disable purely for compile-time strict
 354                                  * const checking. Doing this on a "real"
 355                                  * compile will cause memory leaks */
 356         OPENSSL_free((void*)a->sn);
 357         OPENSSL_free((void*)a->ln);
 358 #endif
 359         a->sn = a->ln = NULL;
 360     }
 361     if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC_DATA) {
 362         OPENSSL_free((void*)a->data);
 363         a->data = NULL;
 364         a->length = 0;
 365     }
 366     if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC)
 367         OPENSSL_free(a);
 368 }
 369
 370 ASN1_OBJECT *ASN1_OBJECT_create(int nid, unsigned char *data, int len,
 371                                 const char *sn, const char *ln)
 372 {
 373     ASN1_OBJECT o;
 374
 375     o.sn = sn;
 376     o.ln = ln;
 377     o.data = data;
 378     o.nid = nid;
 379     o.length = len;
 380     o.flags = ASN1_OBJECT_FLAG_DYNAMIC | ASN1_OBJECT_FLAG_DYNAMIC_STRINGS |
 381         ASN1_OBJECT_FLAG_DYNAMIC_DATA;
 382     return OBJ_dup(&o);
 383 }