lib/libcrypto/x509/x509_vpm.c

   1 /* $OpenBSD: x509_vpm.c,v 1.18 2018/04/06 07:08:20 beck Exp $ */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project 2004.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2004 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
  59 #include <stdio.h>
  60 #include <string.h>
  61
  62 #include <openssl/buffer.h>
  63 #include <openssl/crypto.h>
  64 #include <openssl/lhash.h>
  65 #include <openssl/stack.h>
  66 #include <openssl/x509.h>
  67 #include <openssl/x509v3.h>
  68
  69 #include "vpm_int.h"
  70
  71 /* X509_VERIFY_PARAM functions */
  72
  73 int X509_VERIFY_PARAM_set1_email(X509_VERIFY_PARAM *param, const char *email,
  74     size_t emaillen);
  75 int X509_VERIFY_PARAM_set1_ip(X509_VERIFY_PARAM *param, const unsigned char *ip,
  76     size_t iplen);
  77
  78 #define SET_HOST 0
  79 #define ADD_HOST 1
  80
  81 static void
  82 str_free(char *s)
  83 {
  84     free(s);
  85 }
  86
  87 #define string_stack_free(sk) sk_OPENSSL_STRING_pop_free(sk, str_free)
  88
  89
  90 /*
  91  * Post 1.0.1 sk function "deep_copy".  For the moment we simply make
  92  * these take void * and use them directly without a glorious blob of
  93  * obfuscating macros of dubious value in front of them. All this in
  94  * preparation for a rototilling of safestack.h (likely inspired by
  95  * this).
  96  */
  97 static void *
  98 sk_deep_copy(void *sk_void, void *copy_func_void, void *free_func_void)
  99 {
 100         _STACK *sk = sk_void;
 101         void *(*copy_func)(void *) = copy_func_void;
 102         void (*free_func)(void *) = free_func_void;
 103         _STACK *ret = sk_dup(sk);
 104         size_t i;
 105
 106         if (ret == NULL)
 107                 return NULL;
 108
 109         for (i = 0; i < ret->num; i++) {
 110                 if (ret->data[i] == NULL)
 111                         continue;
 112                 ret->data[i] = copy_func(ret->data[i]);
 113                 if (ret->data[i] == NULL) {
 114                         size_t j;
 115                         for (j = 0; j < i; j++) {
 116                                 if (ret->data[j] != NULL)
 117                                         free_func(ret->data[j]);
 118                         }
 119                         sk_free(ret);
 120                         return NULL;
 121                 }
 122         }
 123
 124         return ret;
 125 }
 126
 127 static int
 128 x509_param_set_hosts_internal(X509_VERIFY_PARAM_ID *id, int mode,
 129     const char *name, size_t namelen)
 130 {
 131         char *copy;
 132
 133         if (name != NULL && namelen == 0)
 134                 namelen = strlen(name);
 135         /*
 136          * Refuse names with embedded NUL bytes.
 137          */
 138         if (name && memchr(name, '\0', namelen))
 139                 return 0;
 140
 141         if (mode == SET_HOST && id->hosts) {
 142                 string_stack_free(id->hosts);
 143                 id->hosts = NULL;
 144         }
 145         if (name == NULL || namelen == 0)
 146                 return 1;
 147         copy = strndup(name, namelen);
 148         if (copy == NULL)
 149                 return 0;
 150
 151         if (id->hosts == NULL &&
 152             (id->hosts = sk_OPENSSL_STRING_new_null()) == NULL) {
 153                 free(copy);
 154                 return 0;
 155         }
 156
 157         if (!sk_OPENSSL_STRING_push(id->hosts, copy)) {
 158                 free(copy);
 159                 if (sk_OPENSSL_STRING_num(id->hosts) == 0) {
 160                         sk_OPENSSL_STRING_free(id->hosts);
 161                         id->hosts = NULL;
 162                 }
 163                 return 0;
 164         }
 165
 166         return 1;
 167 }
 168
 169 static void
 170 x509_verify_param_zero(X509_VERIFY_PARAM *param)
 171 {
 172         X509_VERIFY_PARAM_ID *paramid;
 173         if (!param)
 174                 return;
 175         param->name = NULL;
 176         param->purpose = 0;
 177         param->trust = 0;
 178         /*param->inh_flags = X509_VP_FLAG_DEFAULT;*/
 179         param->inh_flags = 0;
 180         param->flags = 0;
 181         param->depth = -1;
 182         if (param->policies) {
 183                 sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
 184                 param->policies = NULL;
 185         }
 186         paramid = param->id;
 187         if (paramid->hosts) {
 188                 string_stack_free(paramid->hosts);
 189                 paramid->hosts = NULL;
 190         }
 191         free(paramid->peername);
 192         paramid->peername = NULL;
 193         free(paramid->email);
 194         paramid->email = NULL;
 195         paramid->emaillen = 0;
 196         free(paramid->ip);
 197         paramid->ip = NULL;
 198         paramid->iplen = 0;
 199         paramid->poisoned = 0;
 200 }
 201
 202 X509_VERIFY_PARAM *
 203 X509_VERIFY_PARAM_new(void)
 204 {
 205         X509_VERIFY_PARAM *param;
 206         X509_VERIFY_PARAM_ID *paramid;
 207         param = calloc(1, sizeof(X509_VERIFY_PARAM));
 208         if (param == NULL)
 209                 return NULL;
 210         paramid = calloc (1, sizeof(X509_VERIFY_PARAM_ID));
 211         if (paramid == NULL) {
 212                 free(param);
 213                 return NULL;
 214         }
 215         param->id = paramid;
 216         x509_verify_param_zero(param);
 217         return param;
 218 }
 219
 220 void
 221 X509_VERIFY_PARAM_free(X509_VERIFY_PARAM *param)
 222 {
 223         if (param == NULL)
 224                 return;
 225         x509_verify_param_zero(param);
 226         free(param->id);
 227         free(param);
 228 }
 229
 230 /* This function determines how parameters are "inherited" from one structure
 231  * to another. There are several different ways this can happen.
 232  *
 233  * 1. If a child structure needs to have its values initialized from a parent
 234  *    they are simply copied across. For example SSL_CTX copied to SSL.
 235  * 2. If the structure should take on values only if they are currently unset.
 236  *    For example the values in an SSL structure will take appropriate value
 237  *    for SSL servers or clients but only if the application has not set new
 238  *    ones.
 239  *
 240  * The "inh_flags" field determines how this function behaves.
 241  *
 242  * Normally any values which are set in the default are not copied from the
 243  * destination and verify flags are ORed together.
 244  *
 245  * If X509_VP_FLAG_DEFAULT is set then anything set in the source is copied
 246  * to the destination. Effectively the values in "to" become default values
 247  * which will be used only if nothing new is set in "from".
 248  *
 249  * If X509_VP_FLAG_OVERWRITE is set then all value are copied across whether
 250  * they are set or not. Flags is still Ored though.
 251  *
 252  * If X509_VP_FLAG_RESET_FLAGS is set then the flags value is copied instead
 253  * of ORed.
 254  *
 255  * If X509_VP_FLAG_LOCKED is set then no values are copied.
 256  *
 257  * If X509_VP_FLAG_ONCE is set then the current inh_flags setting is zeroed
 258  * after the next call.
 259  */
 260
 261 /* Macro to test if a field should be copied from src to dest */
 262
 263 #define test_x509_verify_param_copy(field, def) \
 264         (to_overwrite || \
 265                 ((src->field != def) && (to_default || (dest->field == def))))
 266
 267 /* As above but for ID fields */
 268
 269 #define test_x509_verify_param_copy_id(idf, def) \
 270         test_x509_verify_param_copy(id->idf, def)
 271
 272 /* Macro to test and copy a field if necessary */
 273
 274 #define x509_verify_param_copy(field, def) \
 275         if (test_x509_verify_param_copy(field, def)) \
 276                 dest->field = src->field
 277
 278 int
 279 X509_VERIFY_PARAM_inherit(X509_VERIFY_PARAM *dest, const X509_VERIFY_PARAM *src)
 280 {
 281         unsigned long inh_flags;
 282         int to_default, to_overwrite;
 283         X509_VERIFY_PARAM_ID *id;
 284
 285         if (!src)
 286                 return 1;
 287         id = src->id;
 288         inh_flags = dest->inh_flags | src->inh_flags;
 289
 290         if (inh_flags & X509_VP_FLAG_ONCE)
 291                 dest->inh_flags = 0;
 292
 293         if (inh_flags & X509_VP_FLAG_LOCKED)
 294                 return 1;
 295
 296         if (inh_flags & X509_VP_FLAG_DEFAULT)
 297                 to_default = 1;
 298         else
 299                 to_default = 0;
 300
 301         if (inh_flags & X509_VP_FLAG_OVERWRITE)
 302                 to_overwrite = 1;
 303         else
 304                 to_overwrite = 0;
 305
 306         x509_verify_param_copy(purpose, 0);
 307         x509_verify_param_copy(trust, 0);
 308         x509_verify_param_copy(depth, -1);
 309
 310         /* If overwrite or check time not set, copy across */
 311
 312         if (to_overwrite || !(dest->flags & X509_V_FLAG_USE_CHECK_TIME)) {
 313                 dest->check_time = src->check_time;
 314                 dest->flags &= ~X509_V_FLAG_USE_CHECK_TIME;
 315                 /* Don't need to copy flag: that is done below */
 316         }
 317
 318         if (inh_flags & X509_VP_FLAG_RESET_FLAGS)
 319                 dest->flags = 0;
 320
 321         dest->flags |= src->flags;
 322
 323         if (test_x509_verify_param_copy(policies, NULL)) {
 324                 if (!X509_VERIFY_PARAM_set1_policies(dest, src->policies))
 325                         return 0;
 326         }
 327
 328         /* Copy the host flags if and only if we're copying the host list */
 329         if (test_x509_verify_param_copy_id(hosts, NULL)) {
 330                 if (dest->id->hosts) {
 331                         string_stack_free(dest->id->hosts);
 332                         dest->id->hosts = NULL;
 333                 }
 334                 if (id->hosts) {
 335                         dest->id->hosts =
 336                             sk_deep_copy(id->hosts, strdup, str_free);
 337                         if (dest->id->hosts == NULL)
 338                                 return 0;
 339                         dest->id->hostflags = id->hostflags;
 340                 }
 341         }
 342
 343         if (test_x509_verify_param_copy_id(email, NULL)) {
 344                 if (!X509_VERIFY_PARAM_set1_email(dest, id->email,
 345                     id->emaillen))
 346                         return 0;
 347         }
 348
 349         if (test_x509_verify_param_copy_id(ip, NULL)) {
 350                 if (!X509_VERIFY_PARAM_set1_ip(dest, id->ip, id->iplen))
 351                         return 0;
 352         }
 353
 354         return 1;
 355 }
 356
 357 int
 358 X509_VERIFY_PARAM_set1(X509_VERIFY_PARAM *to, const X509_VERIFY_PARAM *from)
 359 {
 360         unsigned long save_flags = to->inh_flags;
 361         int ret;
 362
 363         to->inh_flags |= X509_VP_FLAG_DEFAULT;
 364         ret = X509_VERIFY_PARAM_inherit(to, from);
 365         to->inh_flags = save_flags;
 366         return ret;
 367 }
 368
 369 static int
 370 x509_param_set1_internal(char **pdest, size_t *pdestlen,  const char *src,
 371     size_t srclen, int nonul)
 372 {
 373         char *tmp;
 374
 375         if (src == NULL)
 376                 return 0;
 377
 378         if (srclen == 0) {
 379                 srclen = strlen(src);
 380                 if (srclen == 0)
 381                         return 0;
 382                 if ((tmp = strdup(src)) == NULL)
 383                         return 0;
 384         } else {
 385                 if (nonul && memchr(src, '\0', srclen))
 386                         return 0;
 387                 if ((tmp = malloc(srclen)) == NULL)
 388                         return 0;
 389                 memcpy(tmp, src, srclen);
 390         }
 391
 392         if (*pdest)
 393                 free(*pdest);
 394         *pdest = tmp;
 395         if (pdestlen)
 396                 *pdestlen = srclen;
 397         return 1;
 398 }
 399
 400 int
 401 X509_VERIFY_PARAM_set1_name(X509_VERIFY_PARAM *param, const char *name)
 402 {
 403         free(param->name);
 404         param->name = NULL;
 405         if (name == NULL)
 406                 return 1;
 407         param->name = strdup(name);
 408         if (param->name)
 409                 return 1;
 410         return 0;
 411 }
 412
 413 int
 414 X509_VERIFY_PARAM_set_flags(X509_VERIFY_PARAM *param, unsigned long flags)
 415 {
 416         param->flags |= flags;
 417         if (flags & X509_V_FLAG_POLICY_MASK)
 418                 param->flags |= X509_V_FLAG_POLICY_CHECK;
 419         return 1;
 420 }
 421
 422 int
 423 X509_VERIFY_PARAM_clear_flags(X509_VERIFY_PARAM *param, unsigned long flags)
 424 {
 425         param->flags &= ~flags;
 426         return 1;
 427 }
 428
 429 unsigned long
 430 X509_VERIFY_PARAM_get_flags(X509_VERIFY_PARAM *param)
 431 {
 432         return param->flags;
 433 }
 434
 435 int
 436 X509_VERIFY_PARAM_set_purpose(X509_VERIFY_PARAM *param, int purpose)
 437 {
 438         return X509_PURPOSE_set(&param->purpose, purpose);
 439 }
 440
 441 int
 442 X509_VERIFY_PARAM_set_trust(X509_VERIFY_PARAM *param, int trust)
 443 {
 444         return X509_TRUST_set(&param->trust, trust);
 445 }
 446
 447 void
 448 X509_VERIFY_PARAM_set_depth(X509_VERIFY_PARAM *param, int depth)
 449 {
 450         param->depth = depth;
 451 }
 452
 453 void
 454 X509_VERIFY_PARAM_set_time(X509_VERIFY_PARAM *param, time_t t)
 455 {
 456         param->check_time = t;
 457         param->flags |= X509_V_FLAG_USE_CHECK_TIME;
 458 }
 459
 460 int
 461 X509_VERIFY_PARAM_add0_policy(X509_VERIFY_PARAM *param, ASN1_OBJECT *policy)
 462 {
 463         if (!param->policies) {
 464                 param->policies = sk_ASN1_OBJECT_new_null();
 465                 if (!param->policies)
 466                         return 0;
 467         }
 468         if (!sk_ASN1_OBJECT_push(param->policies, policy))
 469                 return 0;
 470         return 1;
 471 }
 472
 473 int
 474 X509_VERIFY_PARAM_set1_policies(X509_VERIFY_PARAM *param,
 475     STACK_OF(ASN1_OBJECT) *policies)
 476 {
 477         int i;
 478         ASN1_OBJECT *oid, *doid;
 479
 480         if (!param)
 481                 return 0;
 482         if (param->policies)
 483                 sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
 484
 485         if (!policies) {
 486                 param->policies = NULL;
 487                 return 1;
 488         }
 489
 490         param->policies = sk_ASN1_OBJECT_new_null();
 491         if (!param->policies)
 492                 return 0;
 493
 494         for (i = 0; i < sk_ASN1_OBJECT_num(policies); i++) {
 495                 oid = sk_ASN1_OBJECT_value(policies, i);
 496                 doid = OBJ_dup(oid);
 497                 if (!doid)
 498                         return 0;
 499                 if (!sk_ASN1_OBJECT_push(param->policies, doid)) {
 500                         ASN1_OBJECT_free(doid);
 501                         return 0;
 502                 }
 503         }
 504         param->flags |= X509_V_FLAG_POLICY_CHECK;
 505         return 1;
 506 }
 507
 508 int
 509 X509_VERIFY_PARAM_set1_host(X509_VERIFY_PARAM *param,
 510     const char *name, size_t namelen)
 511 {
 512         if (x509_param_set_hosts_internal(param->id, SET_HOST, name, namelen))
 513                 return 1;
 514         param->id->poisoned = 1;
 515         return 0;
 516 }
 517
 518 int
 519 X509_VERIFY_PARAM_add1_host(X509_VERIFY_PARAM *param,
 520     const char *name, size_t namelen)
 521 {
 522         if (x509_param_set_hosts_internal(param->id, ADD_HOST, name, namelen))
 523                 return 1;
 524         param->id->poisoned = 1;
 525         return 0;
 526 }
 527
 528 void
 529 X509_VERIFY_PARAM_set_hostflags(X509_VERIFY_PARAM *param, unsigned int flags)
 530 {
 531         param->id->hostflags = flags;
 532 }
 533
 534 char *
 535 X509_VERIFY_PARAM_get0_peername(X509_VERIFY_PARAM *param)
 536 {
 537         return param->id->peername;
 538 }
 539
 540 int
 541 X509_VERIFY_PARAM_set1_email(X509_VERIFY_PARAM *param,  const char *email,
 542     size_t emaillen)
 543 {
 544         if (x509_param_set1_internal(&param->id->email, &param->id->emaillen,
 545             email, emaillen, 1))
 546                 return 1;
 547         param->id->poisoned = 1;
 548         return 0;
 549 }
 550
 551 int
 552 X509_VERIFY_PARAM_set1_ip(X509_VERIFY_PARAM *param, const unsigned char *ip,
 553     size_t iplen)
 554 {
 555         if (iplen != 4 && iplen != 16)
 556                 goto err;
 557         if (x509_param_set1_internal((char **)&param->id->ip, &param->id->iplen,
 558                 (char *)ip, iplen, 0))
 559                 return 1;
 560  err:
 561         param->id->poisoned = 1;
 562         return 0;
 563 }
 564
 565 int
 566 X509_VERIFY_PARAM_set1_ip_asc(X509_VERIFY_PARAM *param, const char *ipasc)
 567 {
 568         unsigned char ipout[16];
 569         size_t iplen;
 570
 571         iplen = (size_t)a2i_ipadd(ipout, ipasc);
 572         return X509_VERIFY_PARAM_set1_ip(param, ipout, iplen);
 573 }
 574
 575 int
 576 X509_VERIFY_PARAM_get_depth(const X509_VERIFY_PARAM *param)
 577 {
 578         return param->depth;
 579 }
 580
 581 const char *
 582 X509_VERIFY_PARAM_get0_name(const X509_VERIFY_PARAM *param)
 583 {
 584         return param->name;
 585 }
 586
 587 static const X509_VERIFY_PARAM_ID _empty_id = { NULL };
 588
 589 #define vpm_empty_id (X509_VERIFY_PARAM_ID *)&_empty_id
 590
 591 /*
 592  * Default verify parameters: these are used for various applications and can
 593  * be overridden by the user specified table.
 594  */
 595
 596 static const X509_VERIFY_PARAM default_table[] = {
 597         {
 598                 .name = "default",
 599                 .depth = 100,
 600                 .trust = 0,  /* XXX This is not the default trust value */
 601                 .id = vpm_empty_id
 602         },
 603         {
 604                 .name = "pkcs7",
 605                 .purpose = X509_PURPOSE_SMIME_SIGN,
 606                 .trust = X509_TRUST_EMAIL,
 607                 .depth = -1,
 608                 .id = vpm_empty_id
 609         },
 610         {
 611                 .name = "smime_sign",
 612                 .purpose = X509_PURPOSE_SMIME_SIGN,
 613                 .trust = X509_TRUST_EMAIL,
 614                 .depth =  -1,
 615                 .id = vpm_empty_id
 616         },
 617         {
 618                 .name = "ssl_client",
 619                 .purpose = X509_PURPOSE_SSL_CLIENT,
 620                 .trust = X509_TRUST_SSL_CLIENT,
 621                 .depth = -1,
 622                 .id = vpm_empty_id
 623         },
 624         {
 625                 .name = "ssl_server",
 626                 .purpose = X509_PURPOSE_SSL_SERVER,
 627                 .trust = X509_TRUST_SSL_SERVER,
 628                 .depth = -1,
 629                 .id = vpm_empty_id
 630         }
 631 };
 632
 633 static STACK_OF(X509_VERIFY_PARAM) *param_table = NULL;
 634
 635 static int
 636 param_cmp(const X509_VERIFY_PARAM * const *a,
 637     const X509_VERIFY_PARAM * const *b)
 638 {
 639         return strcmp((*a)->name, (*b)->name);
 640 }
 641
 642 int
 643 X509_VERIFY_PARAM_add0_table(X509_VERIFY_PARAM *param)
 644 {
 645         X509_VERIFY_PARAM *ptmp;
 646         if (!param_table) {
 647                 param_table = sk_X509_VERIFY_PARAM_new(param_cmp);
 648                 if (!param_table)
 649                         return 0;
 650         } else {
 651                 size_t idx;
 652
 653                 if ((idx = sk_X509_VERIFY_PARAM_find(param_table, param))
 654                     != -1) {
 655                         ptmp = sk_X509_VERIFY_PARAM_value(param_table,
 656                             idx);
 657                         X509_VERIFY_PARAM_free(ptmp);
 658                         (void)sk_X509_VERIFY_PARAM_delete(param_table,
 659                             idx);
 660                 }
 661         }
 662         if (!sk_X509_VERIFY_PARAM_push(param_table, param))
 663                 return 0;
 664         return 1;
 665 }
 666
 667 int
 668 X509_VERIFY_PARAM_get_count(void)
 669 {
 670         int num = sizeof(default_table) / sizeof(X509_VERIFY_PARAM);
 671         if (param_table)
 672                 num += sk_X509_VERIFY_PARAM_num(param_table);
 673         return num;
 674 }
 675
 676 const
 677 X509_VERIFY_PARAM *X509_VERIFY_PARAM_get0(int id)
 678 {
 679         int num = sizeof(default_table) / sizeof(X509_VERIFY_PARAM);
 680         if (id < num)
 681                 return default_table + id;
 682         return sk_X509_VERIFY_PARAM_value(param_table, id - num);
 683 }
 684
 685 const
 686 X509_VERIFY_PARAM *X509_VERIFY_PARAM_lookup(const char *name)
 687 {
 688         X509_VERIFY_PARAM pm;
 689         unsigned int i, limit;
 690
 691         pm.name = (char *)name;
 692         if (param_table) {
 693                 size_t idx;
 694                 if ((idx = sk_X509_VERIFY_PARAM_find(param_table, &pm)) != -1)
 695                         return sk_X509_VERIFY_PARAM_value(param_table, idx);
 696         }
 697
 698         limit = sizeof(default_table) / sizeof(X509_VERIFY_PARAM);
 699         for (i = 0; i < limit; i++) {
 700                 if (strcmp(default_table[i].name, name) == 0) {
 701                         return &default_table[i];
 702                 }
 703         }
 704         return NULL;
 705 }
 706
 707 void
 708 X509_VERIFY_PARAM_table_cleanup(void)
 709 {
 710         if (param_table)
 711                 sk_X509_VERIFY_PARAM_pop_free(param_table,
 712                     X509_VERIFY_PARAM_free);
 713         param_table = NULL;
 714 }