src/third_party/boringssl/src/crypto/x509v3/v3_ncons.c

   1 /* v3_ncons.c */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2003 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com). */
  56
  57
  58 #include <stdio.h>
  59 #include <string.h>
  60
  61 #include <openssl/asn1t.h>
  62 #include <openssl/conf.h>
  63 #include <openssl/err.h>
  64 #include <openssl/mem.h>
  65 #include <openssl/obj.h>
  66 #include <openssl/x509v3.h>
  67
  68
  69 static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
  70                                   X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval);
  71 static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
  72                                 void *a, BIO *bp, int ind);
  73 static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
  74                                    STACK_OF(GENERAL_SUBTREE) *trees,
  75                                    BIO *bp, int ind, const char *name);
  76 static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip);
  77
  78 static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc);
  79 static int nc_match_single(GENERAL_NAME *sub, GENERAL_NAME *gen);
  80 static int nc_dn(X509_NAME *sub, X509_NAME *nm);
  81 static int nc_dns(ASN1_IA5STRING *sub, ASN1_IA5STRING *dns);
  82 static int nc_email(ASN1_IA5STRING *sub, ASN1_IA5STRING *eml);
  83 static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base);
  84
  85 const X509V3_EXT_METHOD v3_name_constraints = {
  86         NID_name_constraints, 0,
  87         ASN1_ITEM_ref(NAME_CONSTRAINTS),
  88         0,0,0,0,
  89         0,0,
  90         0, v2i_NAME_CONSTRAINTS,
  91         i2r_NAME_CONSTRAINTS,0,
  92         NULL
  93 };
  94
  95 ASN1_SEQUENCE(GENERAL_SUBTREE) = {
  96         ASN1_SIMPLE(GENERAL_SUBTREE, base, GENERAL_NAME),
  97         ASN1_IMP_OPT(GENERAL_SUBTREE, minimum, ASN1_INTEGER, 0),
  98         ASN1_IMP_OPT(GENERAL_SUBTREE, maximum, ASN1_INTEGER, 1)
  99 } ASN1_SEQUENCE_END(GENERAL_SUBTREE)
 100
 101 ASN1_SEQUENCE(NAME_CONSTRAINTS) = {
 102         ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, permittedSubtrees,
 103                                                         GENERAL_SUBTREE, 0),
 104         ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, excludedSubtrees,
 105                                                         GENERAL_SUBTREE, 1),
 106 } ASN1_SEQUENCE_END(NAME_CONSTRAINTS)
 107
 108
 109 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(GENERAL_SUBTREE)
 110 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(NAME_CONSTRAINTS)
 111
 112 static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
 113                                   X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
 114         {
 115         size_t i;
 116         CONF_VALUE tval, *val;
 117         STACK_OF(GENERAL_SUBTREE) **ptree = NULL;
 118         NAME_CONSTRAINTS *ncons = NULL;
 119         GENERAL_SUBTREE *sub = NULL;
 120         ncons = NAME_CONSTRAINTS_new();
 121         if (!ncons)
 122                 goto memerr;
 123         for(i = 0; i < sk_CONF_VALUE_num(nval); i++)
 124                 {
 125                 val = sk_CONF_VALUE_value(nval, i);
 126                 if (!strncmp(val->name, "permitted", 9) && val->name[9])
 127                         {
 128                         ptree = &ncons->permittedSubtrees;
 129                         tval.name = val->name + 10;
 130                         }
 131                 else if (!strncmp(val->name, "excluded", 8) && val->name[8])
 132                         {
 133                         ptree = &ncons->excludedSubtrees;
 134                         tval.name = val->name + 9;
 135                         }
 136                 else
 137                         {
 138                         OPENSSL_PUT_ERROR(X509V3, v2i_NAME_CONSTRAINTS, X509V3_R_INVALID_SYNTAX);
 139                         goto err;
 140                         }
 141                 tval.value = val->value;
 142                 sub = GENERAL_SUBTREE_new();
 143                 if (!v2i_GENERAL_NAME_ex(sub->base, method, ctx, &tval, 1))
 144                         goto err;
 145                 if (!*ptree)
 146                         *ptree = sk_GENERAL_SUBTREE_new_null();
 147                 if (!*ptree || !sk_GENERAL_SUBTREE_push(*ptree, sub))
 148                         goto memerr;
 149                 sub = NULL;
 150                 }
 151
 152         return ncons;
 153
 154         memerr:
 155         OPENSSL_PUT_ERROR(X509V3, v2i_NAME_CONSTRAINTS, ERR_R_MALLOC_FAILURE);
 156         err:
 157         if (ncons)
 158                 NAME_CONSTRAINTS_free(ncons);
 159         if (sub)
 160                 GENERAL_SUBTREE_free(sub);
 161
 162         return NULL;
 163         }
 164
 165
 166
 167
 168 static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a,
 169                                 BIO *bp, int ind)
 170         {
 171         NAME_CONSTRAINTS *ncons = a;
 172         do_i2r_name_constraints(method, ncons->permittedSubtrees,
 173                                         bp, ind, "Permitted");
 174         do_i2r_name_constraints(method, ncons->excludedSubtrees,
 175                                         bp, ind, "Excluded");
 176         return 1;
 177         }
 178
 179 static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
 180                                    STACK_OF(GENERAL_SUBTREE) *trees,
 181                                    BIO *bp, int ind, const char *name)
 182         {
 183         GENERAL_SUBTREE *tree;
 184         size_t i;
 185         if (sk_GENERAL_SUBTREE_num(trees) > 0)
 186                 BIO_printf(bp, "%*s%s:\n", ind, "", name);
 187         for(i = 0; i < sk_GENERAL_SUBTREE_num(trees); i++)
 188                 {
 189                 tree = sk_GENERAL_SUBTREE_value(trees, i);
 190                 BIO_printf(bp, "%*s", ind + 2, "");
 191                 if (tree->base->type == GEN_IPADD)
 192                         print_nc_ipadd(bp, tree->base->d.ip);
 193                 else
 194                         GENERAL_NAME_print(bp, tree->base);
 195                 BIO_puts(bp, "\n");
 196                 }
 197         return 1;
 198         }
 199
 200 static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip)
 201         {
 202         int i, len;
 203         unsigned char *p;
 204         p = ip->data;
 205         len = ip->length;
 206         BIO_puts(bp, "IP:");
 207         if(len == 8)
 208                 {
 209                 BIO_printf(bp, "%d.%d.%d.%d/%d.%d.%d.%d",
 210                                 p[0], p[1], p[2], p[3],
 211                                 p[4], p[5], p[6], p[7]);
 212                 }
 213         else if(len == 32)
 214                 {
 215                 for (i = 0; i < 16; i++)
 216                         {
 217                         BIO_printf(bp, "%X", p[0] << 8 | p[1]);
 218                         p += 2;
 219                         if (i == 7)
 220                                 BIO_puts(bp, "/");
 221                         else if (i != 15)
 222                                 BIO_puts(bp, ":");
 223                         }
 224                 }
 225         else
 226                 BIO_printf(bp, "IP Address:<invalid>");
 227         return 1;
 228         }
 229
 230 /* Check a certificate conforms to a specified set of constraints.
 231  * Return values:
 232  *  X509_V_OK: All constraints obeyed.
 233  *  X509_V_ERR_PERMITTED_VIOLATION: Permitted subtree violation.
 234  *  X509_V_ERR_EXCLUDED_VIOLATION: Excluded subtree violation.
 235  *  X509_V_ERR_SUBTREE_MINMAX: Min or max values present and matching type.
 236  *  X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE:  Unsupported constraint type.
 237  *  X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: bad unsupported constraint syntax.
 238  *  X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: bad or unsupported syntax of name
 239
 240  */
 241
 242 int NAME_CONSTRAINTS_check(X509 *x, NAME_CONSTRAINTS *nc)
 243         {
 244         int r, i;
 245         size_t j;
 246         X509_NAME *nm;
 247
 248         nm = X509_get_subject_name(x);
 249
 250         if (X509_NAME_entry_count(nm) > 0)
 251                 {
 252                 GENERAL_NAME gntmp;
 253                 gntmp.type = GEN_DIRNAME;
 254                 gntmp.d.directoryName = nm;
 255
 256                 r = nc_match(&gntmp, nc);
 257
 258                 if (r != X509_V_OK)
 259                         return r;
 260
 261                 gntmp.type = GEN_EMAIL;
 262
 263
 264                 /* Process any email address attributes in subject name */
 265
 266                 for (i = -1;;)
 267                         {
 268                         X509_NAME_ENTRY *ne;
 269                         i = X509_NAME_get_index_by_NID(nm,
 270                                                        NID_pkcs9_emailAddress,
 271                                                        i);
 272                         if (i == -1)
 273                                 break;
 274                         ne = X509_NAME_get_entry(nm, i);
 275                         gntmp.d.rfc822Name = X509_NAME_ENTRY_get_data(ne);
 276                         if (gntmp.d.rfc822Name->type != V_ASN1_IA5STRING)
 277                                 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
 278
 279                         r = nc_match(&gntmp, nc);
 280
 281                         if (r != X509_V_OK)
 282                                 return r;
 283                         }
 284
 285                 }
 286
 287         for (j = 0; j < sk_GENERAL_NAME_num(x->altname); j++)
 288                 {
 289                 GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, j);
 290                 r = nc_match(gen, nc);
 291                 if (r != X509_V_OK)
 292                         return r;
 293                 }
 294
 295         return X509_V_OK;
 296
 297         }
 298
 299 static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc)
 300         {
 301         GENERAL_SUBTREE *sub;
 302         int r, match = 0;
 303         size_t i;
 304
 305         /* Permitted subtrees: if any subtrees exist of matching the type
 306          * at least one subtree must match.
 307          */
 308
 309         for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->permittedSubtrees); i++)
 310                 {
 311                 sub = sk_GENERAL_SUBTREE_value(nc->permittedSubtrees, i);
 312                 if (gen->type != sub->base->type)
 313                         continue;
 314                 if (sub->minimum || sub->maximum)
 315                         return X509_V_ERR_SUBTREE_MINMAX;
 316                 /* If we already have a match don't bother trying any more */
 317                 if (match == 2)
 318                         continue;
 319                 if (match == 0)
 320                         match = 1;
 321                 r = nc_match_single(gen, sub->base);
 322                 if (r == X509_V_OK)
 323                         match = 2;
 324                 else if (r != X509_V_ERR_PERMITTED_VIOLATION)
 325                         return r;
 326                 }
 327
 328         if (match == 1)
 329                 return X509_V_ERR_PERMITTED_VIOLATION;
 330
 331         /* Excluded subtrees: must not match any of these */
 332
 333         for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->excludedSubtrees); i++)
 334                 {
 335                 sub = sk_GENERAL_SUBTREE_value(nc->excludedSubtrees, i);
 336                 if (gen->type != sub->base->type)
 337                         continue;
 338                 if (sub->minimum || sub->maximum)
 339                         return X509_V_ERR_SUBTREE_MINMAX;
 340
 341                 r = nc_match_single(gen, sub->base);
 342                 if (r == X509_V_OK)
 343                         return X509_V_ERR_EXCLUDED_VIOLATION;
 344                 else if (r != X509_V_ERR_PERMITTED_VIOLATION)
 345                         return r;
 346
 347                 }
 348
 349         return X509_V_OK;
 350
 351         }
 352
 353 static int nc_match_single(GENERAL_NAME *gen, GENERAL_NAME *base)
 354         {
 355         switch(base->type)
 356                 {
 357                 case GEN_DIRNAME:
 358                 return nc_dn(gen->d.directoryName, base->d.directoryName);
 359
 360                 case GEN_DNS:
 361                 return nc_dns(gen->d.dNSName, base->d.dNSName);
 362
 363                 case GEN_EMAIL:
 364                 return nc_email(gen->d.rfc822Name, base->d.rfc822Name);
 365
 366                 case GEN_URI:
 367                 return nc_uri(gen->d.uniformResourceIdentifier,
 368                                         base->d.uniformResourceIdentifier);
 369
 370                 default:
 371                 return X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE;
 372                 }
 373
 374         }
 375
 376 /* directoryName name constraint matching.
 377  * The canonical encoding of X509_NAME makes this comparison easy. It is
 378  * matched if the subtree is a subset of the name.
 379  */
 380
 381 static int nc_dn(X509_NAME *nm, X509_NAME *base)
 382         {
 383         /* Ensure canonical encodings are up to date.  */
 384         if (nm->modified && i2d_X509_NAME(nm, NULL) < 0)
 385                 return X509_V_ERR_OUT_OF_MEM;
 386         if (base->modified && i2d_X509_NAME(base, NULL) < 0)
 387                 return X509_V_ERR_OUT_OF_MEM;
 388         if (base->canon_enclen > nm->canon_enclen)
 389                 return X509_V_ERR_PERMITTED_VIOLATION;
 390         if (memcmp(base->canon_enc, nm->canon_enc, base->canon_enclen))
 391                 return X509_V_ERR_PERMITTED_VIOLATION;
 392         return X509_V_OK;
 393         }
 394
 395 static int nc_dns(ASN1_IA5STRING *dns, ASN1_IA5STRING *base)
 396         {
 397         char *baseptr = (char *)base->data;
 398         char *dnsptr = (char *)dns->data;
 399         /* Empty matches everything */
 400         if (!*baseptr)
 401                 return X509_V_OK;
 402         /* Otherwise can add zero or more components on the left so
 403          * compare RHS and if dns is longer and expect '.' as preceding
 404          * character.
 405          */
 406         if (dns->length > base->length)
 407                 {
 408                 dnsptr += dns->length - base->length;
 409                 if (dnsptr[-1] != '.')
 410                         return X509_V_ERR_PERMITTED_VIOLATION;
 411                 }
 412
 413         if (OPENSSL_strcasecmp(baseptr, dnsptr))
 414                         return X509_V_ERR_PERMITTED_VIOLATION;
 415
 416         return X509_V_OK;
 417
 418         }
 419
 420 static int nc_email(ASN1_IA5STRING *eml, ASN1_IA5STRING *base)
 421         {
 422         const char *baseptr = (char *)base->data;
 423         const char *emlptr = (char *)eml->data;
 424
 425         const char *baseat = strchr(baseptr, '@');
 426         const char *emlat = strchr(emlptr, '@');
 427         if (!emlat)
 428                 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
 429         /* Special case: inital '.' is RHS match */
 430         if (!baseat && (*baseptr == '.'))
 431                 {
 432                 if (eml->length > base->length)
 433                         {
 434                         emlptr += eml->length - base->length;
 435                         if (!OPENSSL_strcasecmp(baseptr, emlptr))
 436                                 return X509_V_OK;
 437                         }
 438                 return X509_V_ERR_PERMITTED_VIOLATION;
 439                 }
 440
 441         /* If we have anything before '@' match local part */
 442
 443         if (baseat)
 444                 {
 445                 if (baseat != baseptr)
 446                         {
 447                         if ((baseat - baseptr) != (emlat - emlptr))
 448                                 return X509_V_ERR_PERMITTED_VIOLATION;
 449                         /* Case sensitive match of local part */
 450                         if (strncmp(baseptr, emlptr, emlat - emlptr))
 451                                 return X509_V_ERR_PERMITTED_VIOLATION;
 452                         }
 453                 /* Position base after '@' */
 454                 baseptr = baseat + 1;
 455                 }
 456         emlptr = emlat + 1;
 457         /* Just have hostname left to match: case insensitive */
 458         if (OPENSSL_strcasecmp(baseptr, emlptr))
 459                 return X509_V_ERR_PERMITTED_VIOLATION;
 460
 461         return X509_V_OK;
 462
 463         }
 464
 465 static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base)
 466         {
 467         const char *baseptr = (char *)base->data;
 468         const char *hostptr = (char *)uri->data;
 469         const char *p = strchr(hostptr, ':');
 470         int hostlen;
 471         /* Check for foo:// and skip past it */
 472         if (!p || (p[1] != '/') || (p[2] != '/'))
 473                 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
 474         hostptr = p + 3;
 475
 476         /* Determine length of hostname part of URI */
 477
 478         /* Look for a port indicator as end of hostname first */
 479
 480         p = strchr(hostptr, ':');
 481         /* Otherwise look for trailing slash */
 482         if (!p)
 483                 p = strchr(hostptr, '/');
 484
 485         if (!p)
 486                 hostlen = strlen(hostptr);
 487         else
 488                 hostlen = p - hostptr;
 489
 490         if (hostlen == 0)
 491                 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
 492
 493         /* Special case: inital '.' is RHS match */
 494         if (*baseptr == '.')
 495                 {
 496                 if (hostlen > base->length)
 497                         {
 498                         p = hostptr + hostlen - base->length;
 499                         if (!OPENSSL_strncasecmp(p, baseptr, base->length))
 500                                 return X509_V_OK;
 501                         }
 502                 return X509_V_ERR_PERMITTED_VIOLATION;
 503                 }
 504
 505         if ((base->length != (int)hostlen) || OPENSSL_strncasecmp(hostptr, baseptr, hostlen))
 506                 return X509_V_ERR_PERMITTED_VIOLATION;
 507
 508         return X509_V_OK;
 509
 510         }