crypto/openssl/crypto/x509/x509_vpm.c

   1 /* x509_vpm.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   4  * 2004.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2004 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <stdio.h>
  61
  62 #include "cryptlib.h"
  63 #include <openssl/crypto.h>
  64 #include <openssl/lhash.h>
  65 #include <openssl/buffer.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 #define SET_HOST 0
  74 #define ADD_HOST 1
  75
  76 static char *str_copy(const char *s)
  77 {
  78     return OPENSSL_strdup(s);
  79 }
  80
  81 static void str_free(char *s)
  82 {
  83     OPENSSL_free(s);
  84 }
  85
  86 #define string_stack_free(sk) sk_OPENSSL_STRING_pop_free(sk, str_free)
  87
  88 static int int_x509_param_set_hosts(X509_VERIFY_PARAM_ID *id, int mode,
  89                                     const char *name, size_t namelen)
  90 {
  91     char *copy;
  92
  93     /*
  94      * Refuse names with embedded NUL bytes, except perhaps as final byte.
  95      * XXX: Do we need to push an error onto the error stack?
  96      */
  97     if (namelen == 0 || name == NULL)
  98         namelen = name ? strlen(name) : 0;
  99     else if (name && memchr(name, '\0', namelen > 1 ? namelen - 1 : namelen))
 100         return 0;
 101     if (namelen > 0 && name[namelen - 1] == '\0')
 102         --namelen;
 103
 104     if (mode == SET_HOST && id->hosts) {
 105         string_stack_free(id->hosts);
 106         id->hosts = NULL;
 107     }
 108     if (name == NULL || namelen == 0)
 109         return 1;
 110
 111     copy = BUF_strndup(name, namelen);
 112     if (copy == NULL)
 113         return 0;
 114
 115     if (id->hosts == NULL &&
 116         (id->hosts = sk_OPENSSL_STRING_new_null()) == NULL) {
 117         OPENSSL_free(copy);
 118         return 0;
 119     }
 120
 121     if (!sk_OPENSSL_STRING_push(id->hosts, copy)) {
 122         OPENSSL_free(copy);
 123         if (sk_OPENSSL_STRING_num(id->hosts) == 0) {
 124             sk_OPENSSL_STRING_free(id->hosts);
 125             id->hosts = NULL;
 126         }
 127         return 0;
 128     }
 129
 130     return 1;
 131 }
 132
 133 static void x509_verify_param_zero(X509_VERIFY_PARAM *param)
 134 {
 135     X509_VERIFY_PARAM_ID *paramid;
 136     if (!param)
 137         return;
 138     param->name = NULL;
 139     param->purpose = 0;
 140     param->trust = 0;
 141     /*
 142      * param->inh_flags = X509_VP_FLAG_DEFAULT;
 143      */
 144     param->inh_flags = 0;
 145     param->flags = 0;
 146     param->depth = -1;
 147     if (param->policies) {
 148         sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
 149         param->policies = NULL;
 150     }
 151     paramid = param->id;
 152     if (paramid->hosts) {
 153         string_stack_free(paramid->hosts);
 154         paramid->hosts = NULL;
 155     }
 156     if (paramid->peername)
 157         OPENSSL_free(paramid->peername);
 158     paramid->peername = NULL;
 159     if (paramid->email) {
 160         OPENSSL_free(paramid->email);
 161         paramid->email = NULL;
 162         paramid->emaillen = 0;
 163     }
 164     if (paramid->ip) {
 165         OPENSSL_free(paramid->ip);
 166         paramid->ip = NULL;
 167         paramid->iplen = 0;
 168     }
 169 }
 170
 171 X509_VERIFY_PARAM *X509_VERIFY_PARAM_new(void)
 172 {
 173     X509_VERIFY_PARAM *param;
 174     X509_VERIFY_PARAM_ID *paramid;
 175
 176     param = OPENSSL_malloc(sizeof *param);
 177     if (!param)
 178         return NULL;
 179     memset(param, 0, sizeof(*param));
 180
 181     paramid = OPENSSL_malloc(sizeof(*paramid));
 182     if (!paramid) {
 183         OPENSSL_free(param);
 184         return NULL;
 185     }
 186     memset(paramid, 0, sizeof(*paramid));
 187     /* Exotic platforms may have non-zero bit representation of NULL */
 188     paramid->hosts = NULL;
 189     paramid->peername = NULL;
 190     paramid->email = NULL;
 191     paramid->ip = NULL;
 192
 193     param->id = paramid;
 194     x509_verify_param_zero(param);
 195     return param;
 196 }
 197
 198 void X509_VERIFY_PARAM_free(X509_VERIFY_PARAM *param)
 199 {
 200     if (param == NULL)
 201         return;
 202     x509_verify_param_zero(param);
 203     OPENSSL_free(param->id);
 204     OPENSSL_free(param);
 205 }
 206
 207 /*-
 208  * This function determines how parameters are "inherited" from one structure
 209  * to another. There are several different ways this can happen.
 210  *
 211  * 1. If a child structure needs to have its values initialized from a parent
 212  *    they are simply copied across. For example SSL_CTX copied to SSL.
 213  * 2. If the structure should take on values only if they are currently unset.
 214  *    For example the values in an SSL structure will take appropriate value
 215  *    for SSL servers or clients but only if the application has not set new
 216  *    ones.
 217  *
 218  * The "inh_flags" field determines how this function behaves.
 219  *
 220  * Normally any values which are set in the default are not copied from the
 221  * destination and verify flags are ORed together.
 222  *
 223  * If X509_VP_FLAG_DEFAULT is set then anything set in the source is copied
 224  * to the destination. Effectively the values in "to" become default values
 225  * which will be used only if nothing new is set in "from".
 226  *
 227  * If X509_VP_FLAG_OVERWRITE is set then all value are copied across whether
 228  * they are set or not. Flags is still Ored though.
 229  *
 230  * If X509_VP_FLAG_RESET_FLAGS is set then the flags value is copied instead
 231  * of ORed.
 232  *
 233  * If X509_VP_FLAG_LOCKED is set then no values are copied.
 234  *
 235  * If X509_VP_FLAG_ONCE is set then the current inh_flags setting is zeroed
 236  * after the next call.
 237  */
 238
 239 /* Macro to test if a field should be copied from src to dest */
 240
 241 #define test_x509_verify_param_copy(field, def) \
 242         (to_overwrite || \
 243                 ((src->field != def) && (to_default || (dest->field == def))))
 244
 245 /* As above but for ID fields */
 246
 247 #define test_x509_verify_param_copy_id(idf, def) \
 248         test_x509_verify_param_copy(id->idf, def)
 249
 250 /* Macro to test and copy a field if necessary */
 251
 252 #define x509_verify_param_copy(field, def) \
 253         if (test_x509_verify_param_copy(field, def)) \
 254                 dest->field = src->field
 255
 256 int X509_VERIFY_PARAM_inherit(X509_VERIFY_PARAM *dest,
 257                               const X509_VERIFY_PARAM *src)
 258 {
 259     unsigned long inh_flags;
 260     int to_default, to_overwrite;
 261     X509_VERIFY_PARAM_ID *id;
 262     if (!src)
 263         return 1;
 264     id = src->id;
 265     inh_flags = dest->inh_flags | src->inh_flags;
 266
 267     if (inh_flags & X509_VP_FLAG_ONCE)
 268         dest->inh_flags = 0;
 269
 270     if (inh_flags & X509_VP_FLAG_LOCKED)
 271         return 1;
 272
 273     if (inh_flags & X509_VP_FLAG_DEFAULT)
 274         to_default = 1;
 275     else
 276         to_default = 0;
 277
 278     if (inh_flags & X509_VP_FLAG_OVERWRITE)
 279         to_overwrite = 1;
 280     else
 281         to_overwrite = 0;
 282
 283     x509_verify_param_copy(purpose, 0);
 284     x509_verify_param_copy(trust, 0);
 285     x509_verify_param_copy(depth, -1);
 286
 287     /* If overwrite or check time not set, copy across */
 288
 289     if (to_overwrite || !(dest->flags & X509_V_FLAG_USE_CHECK_TIME)) {
 290         dest->check_time = src->check_time;
 291         dest->flags &= ~X509_V_FLAG_USE_CHECK_TIME;
 292         /* Don't need to copy flag: that is done below */
 293     }
 294
 295     if (inh_flags & X509_VP_FLAG_RESET_FLAGS)
 296         dest->flags = 0;
 297
 298     dest->flags |= src->flags;
 299
 300     if (test_x509_verify_param_copy(policies, NULL)) {
 301         if (!X509_VERIFY_PARAM_set1_policies(dest, src->policies))
 302             return 0;
 303     }
 304
 305     /* Copy the host flags if and only if we're copying the host list */
 306     if (test_x509_verify_param_copy_id(hosts, NULL)) {
 307         if (dest->id->hosts) {
 308             string_stack_free(dest->id->hosts);
 309             dest->id->hosts = NULL;
 310         }
 311         if (id->hosts) {
 312             dest->id->hosts =
 313                 sk_OPENSSL_STRING_deep_copy(id->hosts, str_copy, str_free);
 314             if (dest->id->hosts == NULL)
 315                 return 0;
 316             dest->id->hostflags = id->hostflags;
 317         }
 318     }
 319
 320     if (test_x509_verify_param_copy_id(email, NULL)) {
 321         if (!X509_VERIFY_PARAM_set1_email(dest, id->email, id->emaillen))
 322             return 0;
 323     }
 324
 325     if (test_x509_verify_param_copy_id(ip, NULL)) {
 326         if (!X509_VERIFY_PARAM_set1_ip(dest, id->ip, id->iplen))
 327             return 0;
 328     }
 329
 330     return 1;
 331 }
 332
 333 int X509_VERIFY_PARAM_set1(X509_VERIFY_PARAM *to,
 334                            const X509_VERIFY_PARAM *from)
 335 {
 336     unsigned long save_flags = to->inh_flags;
 337     int ret;
 338     to->inh_flags |= X509_VP_FLAG_DEFAULT;
 339     ret = X509_VERIFY_PARAM_inherit(to, from);
 340     to->inh_flags = save_flags;
 341     return ret;
 342 }
 343
 344 static int int_x509_param_set1(char **pdest, size_t *pdestlen,
 345                                const char *src, size_t srclen)
 346 {
 347     void *tmp;
 348     if (src) {
 349         if (srclen == 0) {
 350             tmp = BUF_strdup(src);
 351             srclen = strlen(src);
 352         } else
 353             tmp = BUF_memdup(src, srclen);
 354         if (!tmp)
 355             return 0;
 356     } else {
 357         tmp = NULL;
 358         srclen = 0;
 359     }
 360     if (*pdest)
 361         OPENSSL_free(*pdest);
 362     *pdest = tmp;
 363     if (pdestlen)
 364         *pdestlen = srclen;
 365     return 1;
 366 }
 367
 368 int X509_VERIFY_PARAM_set1_name(X509_VERIFY_PARAM *param, const char *name)
 369 {
 370     if (param->name)
 371         OPENSSL_free(param->name);
 372     param->name = BUF_strdup(name);
 373     if (param->name)
 374         return 1;
 375     return 0;
 376 }
 377
 378 int X509_VERIFY_PARAM_set_flags(X509_VERIFY_PARAM *param, unsigned long flags)
 379 {
 380     param->flags |= flags;
 381     if (flags & X509_V_FLAG_POLICY_MASK)
 382         param->flags |= X509_V_FLAG_POLICY_CHECK;
 383     return 1;
 384 }
 385
 386 int X509_VERIFY_PARAM_clear_flags(X509_VERIFY_PARAM *param,
 387                                   unsigned long flags)
 388 {
 389     param->flags &= ~flags;
 390     return 1;
 391 }
 392
 393 unsigned long X509_VERIFY_PARAM_get_flags(X509_VERIFY_PARAM *param)
 394 {
 395     return param->flags;
 396 }
 397
 398 int X509_VERIFY_PARAM_set_purpose(X509_VERIFY_PARAM *param, int purpose)
 399 {
 400     return X509_PURPOSE_set(&param->purpose, purpose);
 401 }
 402
 403 int X509_VERIFY_PARAM_set_trust(X509_VERIFY_PARAM *param, int trust)
 404 {
 405     return X509_TRUST_set(&param->trust, trust);
 406 }
 407
 408 void X509_VERIFY_PARAM_set_depth(X509_VERIFY_PARAM *param, int depth)
 409 {
 410     param->depth = depth;
 411 }
 412
 413 void X509_VERIFY_PARAM_set_time(X509_VERIFY_PARAM *param, time_t t)
 414 {
 415     param->check_time = t;
 416     param->flags |= X509_V_FLAG_USE_CHECK_TIME;
 417 }
 418
 419 int X509_VERIFY_PARAM_add0_policy(X509_VERIFY_PARAM *param,
 420                                   ASN1_OBJECT *policy)
 421 {
 422     if (!param->policies) {
 423         param->policies = sk_ASN1_OBJECT_new_null();
 424         if (!param->policies)
 425             return 0;
 426     }
 427     if (!sk_ASN1_OBJECT_push(param->policies, policy))
 428         return 0;
 429     return 1;
 430 }
 431
 432 int X509_VERIFY_PARAM_set1_policies(X509_VERIFY_PARAM *param,
 433                                     STACK_OF(ASN1_OBJECT) *policies)
 434 {
 435     int i;
 436     ASN1_OBJECT *oid, *doid;
 437     if (!param)
 438         return 0;
 439     if (param->policies)
 440         sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
 441
 442     if (!policies) {
 443         param->policies = NULL;
 444         return 1;
 445     }
 446
 447     param->policies = sk_ASN1_OBJECT_new_null();
 448     if (!param->policies)
 449         return 0;
 450
 451     for (i = 0; i < sk_ASN1_OBJECT_num(policies); i++) {
 452         oid = sk_ASN1_OBJECT_value(policies, i);
 453         doid = OBJ_dup(oid);
 454         if (!doid)
 455             return 0;
 456         if (!sk_ASN1_OBJECT_push(param->policies, doid)) {
 457             ASN1_OBJECT_free(doid);
 458             return 0;
 459         }
 460     }
 461     param->flags |= X509_V_FLAG_POLICY_CHECK;
 462     return 1;
 463 }
 464
 465 int X509_VERIFY_PARAM_set1_host(X509_VERIFY_PARAM *param,
 466                                 const char *name, size_t namelen)
 467 {
 468     return int_x509_param_set_hosts(param->id, SET_HOST, name, namelen);
 469 }
 470
 471 int X509_VERIFY_PARAM_add1_host(X509_VERIFY_PARAM *param,
 472                                 const char *name, size_t namelen)
 473 {
 474     return int_x509_param_set_hosts(param->id, ADD_HOST, name, namelen);
 475 }
 476
 477 void X509_VERIFY_PARAM_set_hostflags(X509_VERIFY_PARAM *param,
 478                                      unsigned int flags)
 479 {
 480     param->id->hostflags = flags;
 481 }
 482
 483 char *X509_VERIFY_PARAM_get0_peername(X509_VERIFY_PARAM *param)
 484 {
 485     return param->id->peername;
 486 }
 487
 488 int X509_VERIFY_PARAM_set1_email(X509_VERIFY_PARAM *param,
 489                                  const char *email, size_t emaillen)
 490 {
 491     return int_x509_param_set1(&param->id->email, &param->id->emaillen,
 492                                email, emaillen);
 493 }
 494
 495 int X509_VERIFY_PARAM_set1_ip(X509_VERIFY_PARAM *param,
 496                               const unsigned char *ip, size_t iplen)
 497 {
 498     if (iplen != 0 && iplen != 4 && iplen != 16)
 499         return 0;
 500     return int_x509_param_set1((char **)&param->id->ip, &param->id->iplen,
 501                                (char *)ip, iplen);
 502 }
 503
 504 int X509_VERIFY_PARAM_set1_ip_asc(X509_VERIFY_PARAM *param, const char *ipasc)
 505 {
 506     unsigned char ipout[16];
 507     size_t iplen;
 508
 509     iplen = (size_t)a2i_ipadd(ipout, ipasc);
 510     if (iplen == 0)
 511         return 0;
 512     return X509_VERIFY_PARAM_set1_ip(param, ipout, iplen);
 513 }
 514
 515 int X509_VERIFY_PARAM_get_depth(const X509_VERIFY_PARAM *param)
 516 {
 517     return param->depth;
 518 }
 519
 520 const char *X509_VERIFY_PARAM_get0_name(const X509_VERIFY_PARAM *param)
 521 {
 522     return param->name;
 523 }
 524
 525 static X509_VERIFY_PARAM_ID _empty_id = { NULL, 0U, NULL, NULL, 0, NULL, 0 };
 526
 527 #define vpm_empty_id (X509_VERIFY_PARAM_ID *)&_empty_id
 528
 529 /*
 530  * Default verify parameters: these are used for various applications and can
 531  * be overridden by the user specified table. NB: the 'name' field *must* be
 532  * in alphabetical order because it will be searched using OBJ_search.
 533  */
 534
 535 static const X509_VERIFY_PARAM default_table[] = {
 536     {
 537      "default",                 /* X509 default parameters */
 538      0,                         /* Check time */
 539      0,                         /* internal flags */
 540      0,                         /* flags */
 541      0,                         /* purpose */
 542      0,                         /* trust */
 543      100,                       /* depth */
 544      NULL,                      /* policies */
 545      vpm_empty_id},
 546     {
 547      "pkcs7",                   /* S/MIME sign parameters */
 548      0,                         /* Check time */
 549      0,                         /* internal flags */
 550      0,                         /* flags */
 551      X509_PURPOSE_SMIME_SIGN,   /* purpose */
 552      X509_TRUST_EMAIL,          /* trust */
 553      -1,                        /* depth */
 554      NULL,                      /* policies */
 555      vpm_empty_id},
 556     {
 557      "smime_sign",              /* S/MIME sign parameters */
 558      0,                         /* Check time */
 559      0,                         /* internal flags */
 560      0,                         /* flags */
 561      X509_PURPOSE_SMIME_SIGN,   /* purpose */
 562      X509_TRUST_EMAIL,          /* trust */
 563      -1,                        /* depth */
 564      NULL,                      /* policies */
 565      vpm_empty_id},
 566     {
 567      "ssl_client",              /* SSL/TLS client parameters */
 568      0,                         /* Check time */
 569      0,                         /* internal flags */
 570      0,                         /* flags */
 571      X509_PURPOSE_SSL_CLIENT,   /* purpose */
 572      X509_TRUST_SSL_CLIENT,     /* trust */
 573      -1,                        /* depth */
 574      NULL,                      /* policies */
 575      vpm_empty_id},
 576     {
 577      "ssl_server",              /* SSL/TLS server parameters */
 578      0,                         /* Check time */
 579      0,                         /* internal flags */
 580      0,                         /* flags */
 581      X509_PURPOSE_SSL_SERVER,   /* purpose */
 582      X509_TRUST_SSL_SERVER,     /* trust */
 583      -1,                        /* depth */
 584      NULL,                      /* policies */
 585      vpm_empty_id}
 586 };
 587
 588 static STACK_OF(X509_VERIFY_PARAM) *param_table = NULL;
 589
 590 static int table_cmp(const X509_VERIFY_PARAM *a, const X509_VERIFY_PARAM *b)
 591 {
 592     return strcmp(a->name, b->name);
 593 }
 594
 595 DECLARE_OBJ_BSEARCH_CMP_FN(X509_VERIFY_PARAM, X509_VERIFY_PARAM, table);
 596 IMPLEMENT_OBJ_BSEARCH_CMP_FN(X509_VERIFY_PARAM, X509_VERIFY_PARAM, table);
 597
 598 static int param_cmp(const X509_VERIFY_PARAM *const *a,
 599                      const X509_VERIFY_PARAM *const *b)
 600 {
 601     return strcmp((*a)->name, (*b)->name);
 602 }
 603
 604 int X509_VERIFY_PARAM_add0_table(X509_VERIFY_PARAM *param)
 605 {
 606     int idx;
 607     X509_VERIFY_PARAM *ptmp;
 608     if (!param_table) {
 609         param_table = sk_X509_VERIFY_PARAM_new(param_cmp);
 610         if (!param_table)
 611             return 0;
 612     } else {
 613         idx = sk_X509_VERIFY_PARAM_find(param_table, param);
 614         if (idx != -1) {
 615             ptmp = sk_X509_VERIFY_PARAM_value(param_table, idx);
 616             X509_VERIFY_PARAM_free(ptmp);
 617             (void)sk_X509_VERIFY_PARAM_delete(param_table, idx);
 618         }
 619     }
 620     if (!sk_X509_VERIFY_PARAM_push(param_table, param))
 621         return 0;
 622     return 1;
 623 }
 624
 625 int X509_VERIFY_PARAM_get_count(void)
 626 {
 627     int num = sizeof(default_table) / sizeof(X509_VERIFY_PARAM);
 628     if (param_table)
 629         num += sk_X509_VERIFY_PARAM_num(param_table);
 630     return num;
 631 }
 632
 633 const X509_VERIFY_PARAM *X509_VERIFY_PARAM_get0(int id)
 634 {
 635     int num = sizeof(default_table) / sizeof(X509_VERIFY_PARAM);
 636     if (id < num)
 637         return default_table + id;
 638     return sk_X509_VERIFY_PARAM_value(param_table, id - num);
 639 }
 640
 641 const X509_VERIFY_PARAM *X509_VERIFY_PARAM_lookup(const char *name)
 642 {
 643     int idx;
 644     X509_VERIFY_PARAM pm;
 645
 646     pm.name = (char *)name;
 647     if (param_table) {
 648         idx = sk_X509_VERIFY_PARAM_find(param_table, &pm);
 649         if (idx != -1)
 650             return sk_X509_VERIFY_PARAM_value(param_table, idx);
 651     }
 652     return OBJ_bsearch_table(&pm, default_table,
 653                              sizeof(default_table) /
 654                              sizeof(X509_VERIFY_PARAM));
 655 }
 656
 657 void X509_VERIFY_PARAM_table_cleanup(void)
 658 {
 659     if (param_table)
 660         sk_X509_VERIFY_PARAM_pop_free(param_table, X509_VERIFY_PARAM_free);
 661     param_table = NULL;
 662 }