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 "internal/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 "x509_lcl.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 static int int_x509_param_set_hosts(X509_VERIFY_PARAM_ID *id, int mode,
  87                                     const char *name, size_t namelen)
  88 {
  89     char *copy;
  90
  91     /*
  92      * Refuse names with embedded NUL bytes, except perhaps as final byte.
  93      * XXX: Do we need to push an error onto the error stack?
  94      */
  95     if (namelen == 0)
  96         namelen = name ? strlen(name) : 0;
  97     else if (name && memchr(name, '\0', namelen > 1 ? namelen - 1 : namelen))
  98         return 0;
  99     if (name && name[namelen - 1] == '\0')
 100         --namelen;
 101
 102     if (mode == SET_HOST) {
 103         sk_OPENSSL_STRING_pop_free(id->hosts, str_free);
 104         id->hosts = NULL;
 105     }
 106     if (name == NULL || namelen == 0)
 107         return 1;
 108
 109     copy = BUF_strndup(name, namelen);
 110     if (copy == NULL)
 111         return 0;
 112
 113     if (id->hosts == NULL &&
 114         (id->hosts = sk_OPENSSL_STRING_new_null()) == NULL) {
 115         OPENSSL_free(copy);
 116         return 0;
 117     }
 118
 119     if (!sk_OPENSSL_STRING_push(id->hosts, copy)) {
 120         OPENSSL_free(copy);
 121         if (sk_OPENSSL_STRING_num(id->hosts) == 0) {
 122             sk_OPENSSL_STRING_free(id->hosts);
 123             id->hosts = NULL;
 124         }
 125         return 0;
 126     }
 127
 128     return 1;
 129 }
 130
 131 static void x509_verify_param_zero(X509_VERIFY_PARAM *param)
 132 {
 133     X509_VERIFY_PARAM_ID *paramid;
 134     if (!param)
 135         return;
 136     param->name = NULL;
 137     param->purpose = 0;
 138     param->trust = 0;
 139     /*
 140      * param->inh_flags = X509_VP_FLAG_DEFAULT;
 141      */
 142     param->inh_flags = 0;
 143     param->flags = 0;
 144     param->depth = -1;
 145     sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
 146     param->policies = NULL;
 147     paramid = param->id;
 148     sk_OPENSSL_STRING_pop_free(paramid->hosts, str_free);
 149     paramid->hosts = NULL;
 150     OPENSSL_free(paramid->peername);
 151     OPENSSL_free(paramid->email);
 152     paramid->email = NULL;
 153     paramid->emaillen = 0;
 154     OPENSSL_free(paramid->ip);
 155     paramid->ip = NULL;
 156     paramid->iplen = 0;
 157 }
 158
 159 X509_VERIFY_PARAM *X509_VERIFY_PARAM_new(void)
 160 {
 161     X509_VERIFY_PARAM *param;
 162     X509_VERIFY_PARAM_ID *paramid;
 163
 164     param = OPENSSL_malloc(sizeof(*param));
 165     if (!param)
 166         return NULL;
 167     paramid = OPENSSL_malloc(sizeof(*paramid));
 168     if (!paramid) {
 169         OPENSSL_free(param);
 170         return NULL;
 171     }
 172     memset(param, 0, sizeof(*param));
 173     memset(paramid, 0, sizeof(*paramid));
 174     param->id = paramid;
 175     x509_verify_param_zero(param);
 176     return param;
 177 }
 178
 179 void X509_VERIFY_PARAM_free(X509_VERIFY_PARAM *param)
 180 {
 181     if (!param)
 182         return;
 183     x509_verify_param_zero(param);
 184     OPENSSL_free(param->id);
 185     OPENSSL_free(param);
 186 }
 187
 188 /*-
 189  * This function determines how parameters are "inherited" from one structure
 190  * to another. There are several different ways this can happen.
 191  *
 192  * 1. If a child structure needs to have its values initialized from a parent
 193  *    they are simply copied across. For example SSL_CTX copied to SSL.
 194  * 2. If the structure should take on values only if they are currently unset.
 195  *    For example the values in an SSL structure will take appropriate value
 196  *    for SSL servers or clients but only if the application has not set new
 197  *    ones.
 198  *
 199  * The "inh_flags" field determines how this function behaves.
 200  *
 201  * Normally any values which are set in the default are not copied from the
 202  * destination and verify flags are ORed together.
 203  *
 204  * If X509_VP_FLAG_DEFAULT is set then anything set in the source is copied
 205  * to the destination. Effectively the values in "to" become default values
 206  * which will be used only if nothing new is set in "from".
 207  *
 208  * If X509_VP_FLAG_OVERWRITE is set then all value are copied across whether
 209  * they are set or not. Flags is still Ored though.
 210  *
 211  * If X509_VP_FLAG_RESET_FLAGS is set then the flags value is copied instead
 212  * of ORed.
 213  *
 214  * If X509_VP_FLAG_LOCKED is set then no values are copied.
 215  *
 216  * If X509_VP_FLAG_ONCE is set then the current inh_flags setting is zeroed
 217  * after the next call.
 218  */
 219
 220 /* Macro to test if a field should be copied from src to dest */
 221
 222 #define test_x509_verify_param_copy(field, def) \
 223         (to_overwrite || \
 224                 ((src->field != def) && (to_default || (dest->field == def))))
 225
 226 /* As above but for ID fields */
 227
 228 #define test_x509_verify_param_copy_id(idf, def) \
 229         test_x509_verify_param_copy(id->idf, def)
 230
 231 /* Macro to test and copy a field if necessary */
 232
 233 #define x509_verify_param_copy(field, def) \
 234         if (test_x509_verify_param_copy(field, def)) \
 235                 dest->field = src->field
 236
 237 int X509_VERIFY_PARAM_inherit(X509_VERIFY_PARAM *dest,
 238                               const X509_VERIFY_PARAM *src)
 239 {
 240     unsigned long inh_flags;
 241     int to_default, to_overwrite;
 242     X509_VERIFY_PARAM_ID *id;
 243     if (!src)
 244         return 1;
 245     id = src->id;
 246     inh_flags = dest->inh_flags | src->inh_flags;
 247
 248     if (inh_flags & X509_VP_FLAG_ONCE)
 249         dest->inh_flags = 0;
 250
 251     if (inh_flags & X509_VP_FLAG_LOCKED)
 252         return 1;
 253
 254     if (inh_flags & X509_VP_FLAG_DEFAULT)
 255         to_default = 1;
 256     else
 257         to_default = 0;
 258
 259     if (inh_flags & X509_VP_FLAG_OVERWRITE)
 260         to_overwrite = 1;
 261     else
 262         to_overwrite = 0;
 263
 264     x509_verify_param_copy(purpose, 0);
 265     x509_verify_param_copy(trust, 0);
 266     x509_verify_param_copy(depth, -1);
 267
 268     /* If overwrite or check time not set, copy across */
 269
 270     if (to_overwrite || !(dest->flags & X509_V_FLAG_USE_CHECK_TIME)) {
 271         dest->check_time = src->check_time;
 272         dest->flags &= ~X509_V_FLAG_USE_CHECK_TIME;
 273         /* Don't need to copy flag: that is done below */
 274     }
 275
 276     if (inh_flags & X509_VP_FLAG_RESET_FLAGS)
 277         dest->flags = 0;
 278
 279     dest->flags |= src->flags;
 280
 281     if (test_x509_verify_param_copy(policies, NULL)) {
 282         if (!X509_VERIFY_PARAM_set1_policies(dest, src->policies))
 283             return 0;
 284     }
 285
 286     /* Copy the host flags if and only if we're copying the host list */
 287     if (test_x509_verify_param_copy_id(hosts, NULL)) {
 288         sk_OPENSSL_STRING_pop_free(dest->id->hosts, str_free);
 289         dest->id->hosts = NULL;
 290         if (id->hosts) {
 291             dest->id->hosts =
 292                 sk_OPENSSL_STRING_deep_copy(id->hosts, str_copy, str_free);
 293             if (dest->id->hosts == NULL)
 294                 return 0;
 295             dest->id->hostflags = id->hostflags;
 296         }
 297     }
 298
 299     if (test_x509_verify_param_copy_id(email, NULL)) {
 300         if (!X509_VERIFY_PARAM_set1_email(dest, id->email, id->emaillen))
 301             return 0;
 302     }
 303
 304     if (test_x509_verify_param_copy_id(ip, NULL)) {
 305         if (!X509_VERIFY_PARAM_set1_ip(dest, id->ip, id->iplen))
 306             return 0;
 307     }
 308
 309     return 1;
 310 }
 311
 312 int X509_VERIFY_PARAM_set1(X509_VERIFY_PARAM *to,
 313                            const X509_VERIFY_PARAM *from)
 314 {
 315     unsigned long save_flags = to->inh_flags;
 316     int ret;
 317     to->inh_flags |= X509_VP_FLAG_DEFAULT;
 318     ret = X509_VERIFY_PARAM_inherit(to, from);
 319     to->inh_flags = save_flags;
 320     return ret;
 321 }
 322
 323 static int int_x509_param_set1(char **pdest, size_t *pdestlen,
 324                                const char *src, size_t srclen)
 325 {
 326     void *tmp;
 327     if (src) {
 328         if (srclen == 0) {
 329             tmp = BUF_strdup(src);
 330             srclen = strlen(src);
 331         } else
 332             tmp = BUF_memdup(src, srclen);
 333         if (!tmp)
 334             return 0;
 335     } else {
 336         tmp = NULL;
 337         srclen = 0;
 338     }
 339     OPENSSL_free(*pdest);
 340     *pdest = tmp;
 341     if (pdestlen)
 342         *pdestlen = srclen;
 343     return 1;
 344 }
 345
 346 int X509_VERIFY_PARAM_set1_name(X509_VERIFY_PARAM *param, const char *name)
 347 {
 348     OPENSSL_free(param->name);
 349     param->name = BUF_strdup(name);
 350     if (param->name)
 351         return 1;
 352     return 0;
 353 }
 354
 355 int X509_VERIFY_PARAM_set_flags(X509_VERIFY_PARAM *param, unsigned long flags)
 356 {
 357     param->flags |= flags;
 358     if (flags & X509_V_FLAG_POLICY_MASK)
 359         param->flags |= X509_V_FLAG_POLICY_CHECK;
 360     return 1;
 361 }
 362
 363 int X509_VERIFY_PARAM_clear_flags(X509_VERIFY_PARAM *param,
 364                                   unsigned long flags)
 365 {
 366     param->flags &= ~flags;
 367     return 1;
 368 }
 369
 370 unsigned long X509_VERIFY_PARAM_get_flags(X509_VERIFY_PARAM *param)
 371 {
 372     return param->flags;
 373 }
 374
 375 int X509_VERIFY_PARAM_set_purpose(X509_VERIFY_PARAM *param, int purpose)
 376 {
 377     return X509_PURPOSE_set(&param->purpose, purpose);
 378 }
 379
 380 int X509_VERIFY_PARAM_set_trust(X509_VERIFY_PARAM *param, int trust)
 381 {
 382     return X509_TRUST_set(&param->trust, trust);
 383 }
 384
 385 void X509_VERIFY_PARAM_set_depth(X509_VERIFY_PARAM *param, int depth)
 386 {
 387     param->depth = depth;
 388 }
 389
 390 void X509_VERIFY_PARAM_set_time(X509_VERIFY_PARAM *param, time_t t)
 391 {
 392     param->check_time = t;
 393     param->flags |= X509_V_FLAG_USE_CHECK_TIME;
 394 }
 395
 396 int X509_VERIFY_PARAM_add0_policy(X509_VERIFY_PARAM *param,
 397                                   ASN1_OBJECT *policy)
 398 {
 399     if (!param->policies) {
 400         param->policies = sk_ASN1_OBJECT_new_null();
 401         if (!param->policies)
 402             return 0;
 403     }
 404     if (!sk_ASN1_OBJECT_push(param->policies, policy))
 405         return 0;
 406     return 1;
 407 }
 408
 409 int X509_VERIFY_PARAM_set1_policies(X509_VERIFY_PARAM *param,
 410                                     STACK_OF(ASN1_OBJECT) *policies)
 411 {
 412     int i;
 413     ASN1_OBJECT *oid, *doid;
 414
 415     if (!param)
 416         return 0;
 417     sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
 418
 419     if (!policies) {
 420         param->policies = NULL;
 421         return 1;
 422     }
 423
 424     param->policies = sk_ASN1_OBJECT_new_null();
 425     if (!param->policies)
 426         return 0;
 427
 428     for (i = 0; i < sk_ASN1_OBJECT_num(policies); i++) {
 429         oid = sk_ASN1_OBJECT_value(policies, i);
 430         doid = OBJ_dup(oid);
 431         if (!doid)
 432             return 0;
 433         if (!sk_ASN1_OBJECT_push(param->policies, doid)) {
 434             ASN1_OBJECT_free(doid);
 435             return 0;
 436         }
 437     }
 438     param->flags |= X509_V_FLAG_POLICY_CHECK;
 439     return 1;
 440 }
 441
 442 int X509_VERIFY_PARAM_set1_host(X509_VERIFY_PARAM *param,
 443                                 const char *name, size_t namelen)
 444 {
 445     return int_x509_param_set_hosts(param->id, SET_HOST, name, namelen);
 446 }
 447
 448 int X509_VERIFY_PARAM_add1_host(X509_VERIFY_PARAM *param,
 449                                 const char *name, size_t namelen)
 450 {
 451     return int_x509_param_set_hosts(param->id, ADD_HOST, name, namelen);
 452 }
 453
 454 void X509_VERIFY_PARAM_set_hostflags(X509_VERIFY_PARAM *param,
 455                                      unsigned int flags)
 456 {
 457     param->id->hostflags = flags;
 458 }
 459
 460 char *X509_VERIFY_PARAM_get0_peername(X509_VERIFY_PARAM *param)
 461 {
 462     return param->id->peername;
 463 }
 464
 465 int X509_VERIFY_PARAM_set1_email(X509_VERIFY_PARAM *param,
 466                                  const char *email, size_t emaillen)
 467 {
 468     return int_x509_param_set1(&param->id->email, &param->id->emaillen,
 469                                email, emaillen);
 470 }
 471
 472 int X509_VERIFY_PARAM_set1_ip(X509_VERIFY_PARAM *param,
 473                               const unsigned char *ip, size_t iplen)
 474 {
 475     if (iplen != 0 && iplen != 4 && iplen != 16)
 476         return 0;
 477     return int_x509_param_set1((char **)&param->id->ip, &param->id->iplen,
 478                                (char *)ip, iplen);
 479 }
 480
 481 int X509_VERIFY_PARAM_set1_ip_asc(X509_VERIFY_PARAM *param, const char *ipasc)
 482 {
 483     unsigned char ipout[16];
 484     size_t iplen;
 485
 486     iplen = (size_t)a2i_ipadd(ipout, ipasc);
 487     if (iplen == 0)
 488         return 0;
 489     return X509_VERIFY_PARAM_set1_ip(param, ipout, iplen);
 490 }
 491
 492 int X509_VERIFY_PARAM_get_depth(const X509_VERIFY_PARAM *param)
 493 {
 494     return param->depth;
 495 }
 496
 497 const char *X509_VERIFY_PARAM_get0_name(const X509_VERIFY_PARAM *param)
 498 {
 499     return param->name;
 500 }
 501
 502 static X509_VERIFY_PARAM_ID _empty_id = { NULL, 0U, NULL, NULL, 0, NULL, 0 };
 503
 504 #define vpm_empty_id (X509_VERIFY_PARAM_ID *)&_empty_id
 505
 506 /*
 507  * Default verify parameters: these are used for various applications and can
 508  * be overridden by the user specified table. NB: the 'name' field *must* be
 509  * in alphabetical order because it will be searched using OBJ_search.
 510  */
 511
 512 static const X509_VERIFY_PARAM default_table[] = {
 513     {
 514      "default",                 /* X509 default parameters */
 515      0,                         /* Check time */
 516      0,                         /* internal flags */
 517      0,                         /* flags */
 518      0,                         /* purpose */
 519      0,                         /* trust */
 520      100,                       /* depth */
 521      NULL,                      /* policies */
 522      vpm_empty_id},
 523     {
 524      "pkcs7",                   /* S/MIME sign parameters */
 525      0,                         /* Check time */
 526      0,                         /* internal flags */
 527      0,                         /* flags */
 528      X509_PURPOSE_SMIME_SIGN,   /* purpose */
 529      X509_TRUST_EMAIL,          /* trust */
 530      -1,                        /* depth */
 531      NULL,                      /* policies */
 532      vpm_empty_id},
 533     {
 534      "smime_sign",              /* S/MIME sign parameters */
 535      0,                         /* Check time */
 536      0,                         /* internal flags */
 537      0,                         /* flags */
 538      X509_PURPOSE_SMIME_SIGN,   /* purpose */
 539      X509_TRUST_EMAIL,          /* trust */
 540      -1,                        /* depth */
 541      NULL,                      /* policies */
 542      vpm_empty_id},
 543     {
 544      "ssl_client",              /* SSL/TLS client parameters */
 545      0,                         /* Check time */
 546      0,                         /* internal flags */
 547      0,                         /* flags */
 548      X509_PURPOSE_SSL_CLIENT,   /* purpose */
 549      X509_TRUST_SSL_CLIENT,     /* trust */
 550      -1,                        /* depth */
 551      NULL,                      /* policies */
 552      vpm_empty_id},
 553     {
 554      "ssl_server",              /* SSL/TLS server parameters */
 555      0,                         /* Check time */
 556      0,                         /* internal flags */
 557      0,                         /* flags */
 558      X509_PURPOSE_SSL_SERVER,   /* purpose */
 559      X509_TRUST_SSL_SERVER,     /* trust */
 560      -1,                        /* depth */
 561      NULL,                      /* policies */
 562      vpm_empty_id}
 563 };
 564
 565 static STACK_OF(X509_VERIFY_PARAM) *param_table = NULL;
 566
 567 static int table_cmp(const X509_VERIFY_PARAM *a, const X509_VERIFY_PARAM *b)
 568 {
 569     return strcmp(a->name, b->name);
 570 }
 571
 572 DECLARE_OBJ_BSEARCH_CMP_FN(X509_VERIFY_PARAM, X509_VERIFY_PARAM, table);
 573 IMPLEMENT_OBJ_BSEARCH_CMP_FN(X509_VERIFY_PARAM, X509_VERIFY_PARAM, table);
 574
 575 static int param_cmp(const X509_VERIFY_PARAM *const *a,
 576                      const X509_VERIFY_PARAM *const *b)
 577 {
 578     return strcmp((*a)->name, (*b)->name);
 579 }
 580
 581 int X509_VERIFY_PARAM_add0_table(X509_VERIFY_PARAM *param)
 582 {
 583     int idx;
 584     X509_VERIFY_PARAM *ptmp;
 585     if (!param_table) {
 586         param_table = sk_X509_VERIFY_PARAM_new(param_cmp);
 587         if (!param_table)
 588             return 0;
 589     } else {
 590         idx = sk_X509_VERIFY_PARAM_find(param_table, param);
 591         if (idx != -1) {
 592             ptmp = sk_X509_VERIFY_PARAM_value(param_table, idx);
 593             X509_VERIFY_PARAM_free(ptmp);
 594             (void)sk_X509_VERIFY_PARAM_delete(param_table, idx);
 595         }
 596     }
 597     if (!sk_X509_VERIFY_PARAM_push(param_table, param))
 598         return 0;
 599     return 1;
 600 }
 601
 602 int X509_VERIFY_PARAM_get_count(void)
 603 {
 604     int num = OSSL_NELEM(default_table);
 605     if (param_table)
 606         num += sk_X509_VERIFY_PARAM_num(param_table);
 607     return num;
 608 }
 609
 610 const X509_VERIFY_PARAM *X509_VERIFY_PARAM_get0(int id)
 611 {
 612     int num = OSSL_NELEM(default_table);
 613     if (id < num)
 614         return default_table + id;
 615     return sk_X509_VERIFY_PARAM_value(param_table, id - num);
 616 }
 617
 618 const X509_VERIFY_PARAM *X509_VERIFY_PARAM_lookup(const char *name)
 619 {
 620     int idx;
 621     X509_VERIFY_PARAM pm;
 622
 623     pm.name = (char *)name;
 624     if (param_table) {
 625         idx = sk_X509_VERIFY_PARAM_find(param_table, &pm);
 626         if (idx != -1)
 627             return sk_X509_VERIFY_PARAM_value(param_table, idx);
 628     }
 629     return OBJ_bsearch_table(&pm, default_table, OSSL_NELEM(default_table));
 630 }
 631
 632 void X509_VERIFY_PARAM_table_cleanup(void)
 633 {
 634     sk_X509_VERIFY_PARAM_pop_free(param_table, X509_VERIFY_PARAM_free);
 635     param_table = NULL;
 636 }