crypto/x509/x509_vpm.c

   1 /*
   2  * Copyright 2004-2023 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
  12 #include "internal/cryptlib.h"
  13 #include <openssl/crypto.h>
  14 #include <openssl/buffer.h>
  15 #include <openssl/x509.h>
  16 #include <openssl/x509v3.h>
  17 #include "crypto/x509.h"
  18
  19 #include "x509_local.h"
  20
  21 /* X509_VERIFY_PARAM functions */
  22
  23 #define SET_HOST 0
  24 #define ADD_HOST 1
  25
  26 static char *str_copy(const char *s)
  27 {
  28     return OPENSSL_strdup(s);
  29 }
  30
  31 static void str_free(char *s)
  32 {
  33     OPENSSL_free(s);
  34 }
  35
  36 static int int_x509_param_set_hosts(X509_VERIFY_PARAM *vpm, int mode,
  37                                     const char *name, size_t namelen)
  38 {
  39     char *copy;
  40
  41     /*
  42      * Refuse names with embedded NUL bytes, except perhaps as final byte.
  43      * XXX: Do we need to push an error onto the error stack?
  44      */
  45     if (namelen == 0 || name == NULL)
  46         namelen = name ? strlen(name) : 0;
  47     else if (name != NULL
  48              && memchr(name, '\0', namelen > 1 ? namelen - 1 : namelen) != NULL)
  49         return 0;
  50     if (namelen > 0 && name[namelen - 1] == '\0')
  51         --namelen;
  52
  53     if (mode == SET_HOST) {
  54         sk_OPENSSL_STRING_pop_free(vpm->hosts, str_free);
  55         vpm->hosts = NULL;
  56     }
  57     if (name == NULL || namelen == 0)
  58         return 1;
  59
  60     copy = OPENSSL_strndup(name, namelen);
  61     if (copy == NULL)
  62         return 0;
  63
  64     if (vpm->hosts == NULL &&
  65         (vpm->hosts = sk_OPENSSL_STRING_new_null()) == NULL) {
  66         OPENSSL_free(copy);
  67         return 0;
  68     }
  69
  70     if (!sk_OPENSSL_STRING_push(vpm->hosts, copy)) {
  71         OPENSSL_free(copy);
  72         if (sk_OPENSSL_STRING_num(vpm->hosts) == 0) {
  73             sk_OPENSSL_STRING_free(vpm->hosts);
  74             vpm->hosts = NULL;
  75         }
  76         return 0;
  77     }
  78
  79     return 1;
  80 }
  81
  82 X509_VERIFY_PARAM *X509_VERIFY_PARAM_new(void)
  83 {
  84     X509_VERIFY_PARAM *param;
  85
  86     param = OPENSSL_zalloc(sizeof(*param));
  87     if (param == NULL)
  88         return NULL;
  89     param->trust = X509_TRUST_DEFAULT;
  90     /* param->inh_flags = X509_VP_FLAG_DEFAULT; */
  91     param->depth = -1;
  92     param->auth_level = -1; /* -1 means unset, 0 is explicit */
  93     return param;
  94 }
  95
  96 void X509_VERIFY_PARAM_free(X509_VERIFY_PARAM *param)
  97 {
  98     if (param == NULL)
  99         return;
 100     sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
 101     sk_OPENSSL_STRING_pop_free(param->hosts, str_free);
 102     OPENSSL_free(param->peername);
 103     OPENSSL_free(param->email);
 104     OPENSSL_free(param->ip);
 105     OPENSSL_free(param);
 106 }
 107
 108 /*-
 109  * This function determines how parameters are "inherited" from one structure
 110  * to another. There are several different ways this can happen.
 111  *
 112  * 1. If a child structure needs to have its values initialized from a parent
 113  *    they are simply copied across. For example SSL_CTX copied to SSL.
 114  * 2. If the structure should take on values only if they are currently unset.
 115  *    For example the values in an SSL structure will take appropriate value
 116  *    for SSL servers or clients but only if the application has not set new
 117  *    ones.
 118  *
 119  * The "inh_flags" field determines how this function behaves.
 120  *
 121  * Normally any values which are set in the default are not copied from the
 122  * destination and verify flags are ORed together.
 123  *
 124  * If X509_VP_FLAG_DEFAULT is set then anything set in the source is copied
 125  * to the destination. Effectively the values in "to" become default values
 126  * which will be used only if nothing new is set in "from".
 127  *
 128  * If X509_VP_FLAG_OVERWRITE is set then all value are copied across whether
 129  * they are set or not. Flags is still Ored though.
 130  *
 131  * If X509_VP_FLAG_RESET_FLAGS is set then the flags value is copied instead
 132  * of ORed.
 133  *
 134  * If X509_VP_FLAG_LOCKED is set then no values are copied.
 135  *
 136  * If X509_VP_FLAG_ONCE is set then the current inh_flags setting is zeroed
 137  * after the next call.
 138  */
 139
 140 /* Macro to test if a field should be copied from src to dest */
 141
 142 #define test_x509_verify_param_copy(field, def) \
 143     (to_overwrite || (src->field != def && (to_default || dest->field == def)))
 144
 145 /* Macro to test and copy a field if necessary */
 146
 147 #define x509_verify_param_copy(field, def) \
 148     if (test_x509_verify_param_copy(field, def)) \
 149         dest->field = src->field;
 150
 151 int X509_VERIFY_PARAM_inherit(X509_VERIFY_PARAM *dest,
 152                               const X509_VERIFY_PARAM *src)
 153 {
 154     unsigned long inh_flags;
 155     int to_default, to_overwrite;
 156
 157     if (src == NULL)
 158         return 1;
 159     inh_flags = dest->inh_flags | src->inh_flags;
 160
 161     if ((inh_flags & X509_VP_FLAG_ONCE) != 0)
 162         dest->inh_flags = 0;
 163
 164     if ((inh_flags & X509_VP_FLAG_LOCKED) != 0)
 165         return 1;
 166
 167     to_default = (inh_flags & X509_VP_FLAG_DEFAULT) != 0;
 168     to_overwrite = (inh_flags & X509_VP_FLAG_OVERWRITE) != 0;
 169
 170     x509_verify_param_copy(purpose, 0);
 171     x509_verify_param_copy(trust, X509_TRUST_DEFAULT);
 172     x509_verify_param_copy(depth, -1);
 173     x509_verify_param_copy(auth_level, -1);
 174
 175     /* If overwrite or check time not set, copy across */
 176
 177     if (to_overwrite || (dest->flags & X509_V_FLAG_USE_CHECK_TIME) == 0) {
 178         dest->check_time = src->check_time;
 179         dest->flags &= ~X509_V_FLAG_USE_CHECK_TIME;
 180         /* Don't need to copy flag: that is done below */
 181     }
 182
 183     if ((inh_flags & X509_VP_FLAG_RESET_FLAGS) != 0)
 184         dest->flags = 0;
 185
 186     dest->flags |= src->flags;
 187
 188     if (test_x509_verify_param_copy(policies, NULL)) {
 189         if (!X509_VERIFY_PARAM_set1_policies(dest, src->policies))
 190             return 0;
 191     }
 192
 193     x509_verify_param_copy(hostflags, 0);
 194
 195     if (test_x509_verify_param_copy(hosts, NULL)) {
 196         sk_OPENSSL_STRING_pop_free(dest->hosts, str_free);
 197         dest->hosts = NULL;
 198         if (src->hosts != NULL) {
 199             dest->hosts =
 200                 sk_OPENSSL_STRING_deep_copy(src->hosts, str_copy, str_free);
 201             if (dest->hosts == NULL)
 202                 return 0;
 203         }
 204     }
 205
 206     if (test_x509_verify_param_copy(email, NULL)) {
 207         if (!X509_VERIFY_PARAM_set1_email(dest, src->email, src->emaillen))
 208             return 0;
 209     }
 210
 211     if (test_x509_verify_param_copy(ip, NULL)) {
 212         if (!X509_VERIFY_PARAM_set1_ip(dest, src->ip, src->iplen))
 213             return 0;
 214     }
 215
 216     return 1;
 217 }
 218
 219 int X509_VERIFY_PARAM_set1(X509_VERIFY_PARAM *to,
 220                            const X509_VERIFY_PARAM *from)
 221 {
 222     unsigned long save_flags;
 223     int ret;
 224
 225     if (to == NULL) {
 226         ERR_raise(ERR_LIB_X509, ERR_R_PASSED_NULL_PARAMETER);
 227         return 0;
 228     }
 229     save_flags = to->inh_flags;
 230     to->inh_flags |= X509_VP_FLAG_DEFAULT;
 231     ret = X509_VERIFY_PARAM_inherit(to, from);
 232     to->inh_flags = save_flags;
 233     return ret;
 234 }
 235
 236 static int int_x509_param_set1(char **pdest, size_t *pdestlen,
 237                                const char *src, size_t srclen)
 238 {
 239     char *tmp;
 240
 241     if (src != NULL) {
 242         if (srclen == 0)
 243             srclen = strlen(src);
 244
 245         tmp = OPENSSL_malloc(srclen + 1);
 246         if (tmp == NULL)
 247             return 0;
 248         memcpy(tmp, src, srclen);
 249         tmp[srclen] = '\0'; /* enforce NUL termination */
 250     } else {
 251         tmp = NULL;
 252         srclen = 0;
 253     }
 254     OPENSSL_free(*pdest);
 255     *pdest = tmp;
 256     if (pdestlen != NULL)
 257         *pdestlen = srclen;
 258     return 1;
 259 }
 260
 261 int X509_VERIFY_PARAM_set1_name(X509_VERIFY_PARAM *param, const char *name)
 262 {
 263     OPENSSL_free(param->name);
 264     param->name = OPENSSL_strdup(name);
 265     return param->name != NULL;
 266 }
 267
 268 int X509_VERIFY_PARAM_set_flags(X509_VERIFY_PARAM *param, unsigned long flags)
 269 {
 270     param->flags |= flags;
 271     if ((flags & X509_V_FLAG_POLICY_MASK) != 0)
 272         param->flags |= X509_V_FLAG_POLICY_CHECK;
 273     return 1;
 274 }
 275
 276 int X509_VERIFY_PARAM_clear_flags(X509_VERIFY_PARAM *param,
 277                                   unsigned long flags)
 278 {
 279     param->flags &= ~flags;
 280     return 1;
 281 }
 282
 283 unsigned long X509_VERIFY_PARAM_get_flags(const X509_VERIFY_PARAM *param)
 284 {
 285     return param->flags;
 286 }
 287
 288 uint32_t X509_VERIFY_PARAM_get_inh_flags(const X509_VERIFY_PARAM *param)
 289 {
 290     return param->inh_flags;
 291 }
 292
 293 int X509_VERIFY_PARAM_set_inh_flags(X509_VERIFY_PARAM *param, uint32_t flags)
 294 {
 295     param->inh_flags = flags;
 296     return 1;
 297 }
 298
 299 int X509_VERIFY_PARAM_set_purpose(X509_VERIFY_PARAM *param, int purpose)
 300 {
 301     return X509_PURPOSE_set(&param->purpose, purpose);
 302 }
 303
 304 int X509_VERIFY_PARAM_set_trust(X509_VERIFY_PARAM *param, int trust)
 305 {
 306     return X509_TRUST_set(&param->trust, trust);
 307 }
 308
 309 void X509_VERIFY_PARAM_set_depth(X509_VERIFY_PARAM *param, int depth)
 310 {
 311     param->depth = depth;
 312 }
 313
 314 void X509_VERIFY_PARAM_set_auth_level(X509_VERIFY_PARAM *param, int auth_level)
 315 {
 316     param->auth_level = auth_level;
 317 }
 318
 319 time_t X509_VERIFY_PARAM_get_time(const X509_VERIFY_PARAM *param)
 320 {
 321     return param->check_time;
 322 }
 323
 324 void X509_VERIFY_PARAM_set_time(X509_VERIFY_PARAM *param, time_t t)
 325 {
 326     param->check_time = t;
 327     param->flags |= X509_V_FLAG_USE_CHECK_TIME;
 328 }
 329
 330 int X509_VERIFY_PARAM_add0_policy(X509_VERIFY_PARAM *param,
 331                                   ASN1_OBJECT *policy)
 332 {
 333     if (param->policies == NULL) {
 334         param->policies = sk_ASN1_OBJECT_new_null();
 335         if (param->policies == NULL)
 336             return 0;
 337     }
 338
 339     if (sk_ASN1_OBJECT_push(param->policies, policy) <= 0)
 340         return 0;
 341     return 1;
 342 }
 343
 344 int X509_VERIFY_PARAM_set1_policies(X509_VERIFY_PARAM *param,
 345                                     STACK_OF(ASN1_OBJECT) *policies)
 346 {
 347     int i;
 348     ASN1_OBJECT *oid, *doid;
 349
 350     if (param == NULL) {
 351         ERR_raise(ERR_LIB_X509, ERR_R_PASSED_NULL_PARAMETER);
 352         return 0;
 353     }
 354     sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
 355
 356     if (policies == NULL) {
 357         param->policies = NULL;
 358         return 1;
 359     }
 360
 361     param->policies = sk_ASN1_OBJECT_new_null();
 362     if (param->policies == NULL)
 363         return 0;
 364
 365     for (i = 0; i < sk_ASN1_OBJECT_num(policies); i++) {
 366         oid = sk_ASN1_OBJECT_value(policies, i);
 367         doid = OBJ_dup(oid);
 368         if (doid == NULL)
 369             return 0;
 370         if (!sk_ASN1_OBJECT_push(param->policies, doid)) {
 371             ASN1_OBJECT_free(doid);
 372             return 0;
 373         }
 374     }
 375     param->flags |= X509_V_FLAG_POLICY_CHECK;
 376     return 1;
 377 }
 378
 379 char *X509_VERIFY_PARAM_get0_host(X509_VERIFY_PARAM *param, int idx)
 380 {
 381     return sk_OPENSSL_STRING_value(param->hosts, idx);
 382 }
 383
 384 int X509_VERIFY_PARAM_set1_host(X509_VERIFY_PARAM *param,
 385                                 const char *name, size_t namelen)
 386 {
 387     return int_x509_param_set_hosts(param, SET_HOST, name, namelen);
 388 }
 389
 390 int X509_VERIFY_PARAM_add1_host(X509_VERIFY_PARAM *param,
 391                                 const char *name, size_t namelen)
 392 {
 393     return int_x509_param_set_hosts(param, ADD_HOST, name, namelen);
 394 }
 395
 396 void X509_VERIFY_PARAM_set_hostflags(X509_VERIFY_PARAM *param,
 397                                      unsigned int flags)
 398 {
 399     param->hostflags = flags;
 400 }
 401
 402 unsigned int X509_VERIFY_PARAM_get_hostflags(const X509_VERIFY_PARAM *param)
 403 {
 404     return param->hostflags;
 405 }
 406
 407 char *X509_VERIFY_PARAM_get0_peername(const X509_VERIFY_PARAM *param)
 408 {
 409     return param->peername;
 410 }
 411
 412 /*
 413  * Move peername from one param structure to another, freeing any name present
 414  * at the target.  If the source is a NULL parameter structure, free and zero
 415  * the target peername.
 416  */
 417 void X509_VERIFY_PARAM_move_peername(X509_VERIFY_PARAM *to,
 418                                      X509_VERIFY_PARAM *from)
 419 {
 420     char *peername = (from != NULL) ? from->peername : NULL;
 421
 422     if (to->peername != peername) {
 423         OPENSSL_free(to->peername);
 424         to->peername = peername;
 425     }
 426     if (from != NULL)
 427         from->peername = NULL;
 428 }
 429
 430 char *X509_VERIFY_PARAM_get0_email(X509_VERIFY_PARAM *param)
 431 {
 432     return param->email;
 433 }
 434
 435 int X509_VERIFY_PARAM_set1_email(X509_VERIFY_PARAM *param,
 436                                  const char *email, size_t emaillen)
 437 {
 438     return int_x509_param_set1(&param->email, &param->emaillen,
 439                                email, emaillen);
 440 }
 441
 442 static unsigned char
 443 *int_X509_VERIFY_PARAM_get0_ip(X509_VERIFY_PARAM *param, size_t *plen)
 444 {
 445     if (param == NULL || param->ip == NULL) {
 446         ERR_raise(ERR_LIB_X509, ERR_R_PASSED_NULL_PARAMETER);
 447         return NULL;
 448     }
 449     if (plen != NULL)
 450         *plen = param->iplen;
 451     return param->ip;
 452 }
 453
 454 char *X509_VERIFY_PARAM_get1_ip_asc(X509_VERIFY_PARAM *param)
 455 {
 456     size_t iplen;
 457     unsigned char *ip = int_X509_VERIFY_PARAM_get0_ip(param, &iplen);
 458
 459     return ip == NULL ? NULL : ossl_ipaddr_to_asc(ip, iplen);
 460 }
 461
 462 int X509_VERIFY_PARAM_set1_ip(X509_VERIFY_PARAM *param,
 463                               const unsigned char *ip, size_t iplen)
 464 {
 465     if (iplen != 0 && iplen != 4 && iplen != 16) {
 466         ERR_raise(ERR_LIB_X509, ERR_R_PASSED_INVALID_ARGUMENT);
 467         return 0;
 468     }
 469     return int_x509_param_set1((char **)&param->ip, &param->iplen,
 470                                (char *)ip, iplen);
 471 }
 472
 473 int X509_VERIFY_PARAM_set1_ip_asc(X509_VERIFY_PARAM *param, const char *ipasc)
 474 {
 475     unsigned char ipout[16];
 476     size_t iplen = (size_t)ossl_a2i_ipadd(ipout, ipasc);
 477
 478     if (iplen == 0)
 479         return 0;
 480     return X509_VERIFY_PARAM_set1_ip(param, ipout, iplen);
 481 }
 482
 483 int X509_VERIFY_PARAM_get_depth(const X509_VERIFY_PARAM *param)
 484 {
 485     return param->depth;
 486 }
 487
 488 int X509_VERIFY_PARAM_get_auth_level(const X509_VERIFY_PARAM *param)
 489 {
 490     return param->auth_level;
 491 }
 492
 493 const char *X509_VERIFY_PARAM_get0_name(const X509_VERIFY_PARAM *param)
 494 {
 495     return param->name;
 496 }
 497
 498 #define vpm_empty_id NULL, 0U, NULL, NULL, 0, NULL, 0
 499
 500 /*
 501  * Default verify parameters: these are used for various applications and can
 502  * be overridden by the user specified table. NB: the 'name' field *must* be
 503  * in alphabetical order because it will be searched using OBJ_search.
 504  */
 505
 506 static const X509_VERIFY_PARAM default_table[] = {
 507     {
 508      "code_sign",               /* Code sign parameters */
 509      0,                         /* check time to use */
 510      0,                         /* inheritance flags */
 511      0,                         /* flags */
 512      X509_PURPOSE_CODE_SIGN,    /* purpose */
 513      X509_TRUST_OBJECT_SIGN,    /* trust */
 514      -1,                        /* depth */
 515      -1,                        /* auth_level */
 516      NULL,                      /* policies */
 517      vpm_empty_id
 518     },
 519     {
 520      "default",                 /* X509 default parameters */
 521      0,                         /* check time to use */
 522      0,                         /* inheritance flags */
 523      X509_V_FLAG_TRUSTED_FIRST, /* flags */
 524      0,                         /* purpose */
 525      0,                         /* trust */
 526      100,                       /* depth */
 527      -1,                        /* auth_level */
 528      NULL,                      /* policies */
 529      vpm_empty_id
 530     },
 531     {
 532      "pkcs7",                   /* S/MIME sign parameters */
 533      0,                         /* check time to use */
 534      0,                         /* inheritance flags */
 535      0,                         /* flags */
 536      X509_PURPOSE_SMIME_SIGN,   /* purpose */
 537      X509_TRUST_EMAIL,          /* trust */
 538      -1,                        /* depth */
 539      -1,                        /* auth_level */
 540      NULL,                      /* policies */
 541      vpm_empty_id
 542     },
 543     {
 544      "smime_sign",              /* S/MIME sign parameters */
 545      0,                         /* check time to use */
 546      0,                         /* inheritance flags */
 547      0,                         /* flags */
 548      X509_PURPOSE_SMIME_SIGN,   /* purpose */
 549      X509_TRUST_EMAIL,          /* trust */
 550      -1,                        /* depth */
 551      -1,                        /* auth_level */
 552      NULL,                      /* policies */
 553      vpm_empty_id
 554     },
 555     {
 556      "ssl_client",              /* SSL/TLS client parameters */
 557      0,                         /* check time to use */
 558      0,                         /* inheritance flags */
 559      0,                         /* flags */
 560      X509_PURPOSE_SSL_CLIENT,   /* purpose */
 561      X509_TRUST_SSL_CLIENT,     /* trust */
 562      -1,                        /* depth */
 563      -1,                        /* auth_level */
 564      NULL,                      /* policies */
 565      vpm_empty_id
 566     },
 567     {
 568      "ssl_server",              /* SSL/TLS server parameters */
 569      0,                         /* check time to use */
 570      0,                         /* inheritance flags */
 571      0,                         /* flags */
 572      X509_PURPOSE_SSL_SERVER,   /* purpose */
 573      X509_TRUST_SSL_SERVER,     /* trust */
 574      -1,                        /* depth */
 575      -1,                        /* auth_level */
 576      NULL,                      /* policies */
 577      vpm_empty_id
 578     }
 579 };
 580
 581 static STACK_OF(X509_VERIFY_PARAM) *param_table = NULL;
 582
 583 static int table_cmp(const X509_VERIFY_PARAM *a, const X509_VERIFY_PARAM *b)
 584 {
 585     return strcmp(a->name, b->name);
 586 }
 587
 588 DECLARE_OBJ_BSEARCH_CMP_FN(X509_VERIFY_PARAM, X509_VERIFY_PARAM, table);
 589 IMPLEMENT_OBJ_BSEARCH_CMP_FN(X509_VERIFY_PARAM, X509_VERIFY_PARAM, table);
 590
 591 static int param_cmp(const X509_VERIFY_PARAM *const *a,
 592                      const X509_VERIFY_PARAM *const *b)
 593 {
 594     return strcmp((*a)->name, (*b)->name);
 595 }
 596
 597 int X509_VERIFY_PARAM_add0_table(X509_VERIFY_PARAM *param)
 598 {
 599     int idx;
 600     X509_VERIFY_PARAM *ptmp;
 601
 602     if (param_table == NULL) {
 603         param_table = sk_X509_VERIFY_PARAM_new(param_cmp);
 604         if (param_table == NULL)
 605             return 0;
 606     } else {
 607         idx = sk_X509_VERIFY_PARAM_find(param_table, param);
 608         if (idx >= 0) {
 609             ptmp = sk_X509_VERIFY_PARAM_delete(param_table, idx);
 610             X509_VERIFY_PARAM_free(ptmp);
 611         }
 612     }
 613
 614     if (sk_X509_VERIFY_PARAM_push(param_table, param) <= 0)
 615         return 0;
 616     return 1;
 617 }
 618
 619 int X509_VERIFY_PARAM_get_count(void)
 620 {
 621     int num = OSSL_NELEM(default_table);
 622
 623     if (param_table != NULL)
 624         num += sk_X509_VERIFY_PARAM_num(param_table);
 625     return num;
 626 }
 627
 628 const X509_VERIFY_PARAM *X509_VERIFY_PARAM_get0(int id)
 629 {
 630     int num = OSSL_NELEM(default_table);
 631
 632     if (id < num)
 633         return default_table + id;
 634     return sk_X509_VERIFY_PARAM_value(param_table, id - num);
 635 }
 636
 637 const X509_VERIFY_PARAM *X509_VERIFY_PARAM_lookup(const char *name)
 638 {
 639     int idx;
 640     X509_VERIFY_PARAM pm;
 641
 642     pm.name = (char *)name;
 643     if (param_table != NULL) {
 644         /* Ideally, this would be done under a lock */
 645         sk_X509_VERIFY_PARAM_sort(param_table);
 646         idx = sk_X509_VERIFY_PARAM_find(param_table, &pm);
 647         if (idx >= 0)
 648             return sk_X509_VERIFY_PARAM_value(param_table, idx);
 649     }
 650     return OBJ_bsearch_table(&pm, default_table, OSSL_NELEM(default_table));
 651 }
 652
 653 void X509_VERIFY_PARAM_table_cleanup(void)
 654 {
 655     sk_X509_VERIFY_PARAM_pop_free(param_table, X509_VERIFY_PARAM_free);
 656     param_table = NULL;
 657 }