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      1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com)
      2  * All rights reserved.
      3  *
      4  * This package is an SSL implementation written
      5  * by Eric Young (eay (at) cryptsoft.com).
      6  * The implementation was written so as to conform with Netscapes SSL.
      7  *
      8  * This library is free for commercial and non-commercial use as long as
      9  * the following conditions are aheared to.  The following conditions
     10  * apply to all code found in this distribution, be it the RC4, RSA,
     11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
     12  * included with this distribution is covered by the same copyright terms
     13  * except that the holder is Tim Hudson (tjh (at) cryptsoft.com).
     14  *
     15  * Copyright remains Eric Young's, and as such any Copyright notices in
     16  * the code are not to be removed.
     17  * If this package is used in a product, Eric Young should be given attribution
     18  * as the author of the parts of the library used.
     19  * This can be in the form of a textual message at program startup or
     20  * in documentation (online or textual) provided with the package.
     21  *
     22  * Redistribution and use in source and binary forms, with or without
     23  * modification, are permitted provided that the following conditions
     24  * are met:
     25  * 1. Redistributions of source code must retain the copyright
     26  *    notice, this list of conditions and the following disclaimer.
     27  * 2. Redistributions in binary form must reproduce the above copyright
     28  *    notice, this list of conditions and the following disclaimer in the
     29  *    documentation and/or other materials provided with the distribution.
     30  * 3. All advertising materials mentioning features or use of this software
     31  *    must display the following acknowledgement:
     32  *    "This product includes cryptographic software written by
     33  *     Eric Young (eay (at) cryptsoft.com)"
     34  *    The word 'cryptographic' can be left out if the rouines from the library
     35  *    being used are not cryptographic related :-).
     36  * 4. If you include any Windows specific code (or a derivative thereof) from
     37  *    the apps directory (application code) you must include an acknowledgement:
     38  *    "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)"
     39  *
     40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
     41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     50  * SUCH DAMAGE.
     51  *
     52  * The licence and distribution terms for any publically available version or
     53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
     54  * copied and put under another distribution licence
     55  * [including the GNU Public Licence.] */
     56 
     57 #include <openssl/asn1.h>
     58 #include <openssl/asn1t.h>
     59 #include <openssl/digest.h>
     60 #include <openssl/err.h>
     61 #include <openssl/mem.h>
     62 #include <openssl/obj.h>
     63 #include <openssl/stack.h>
     64 #include <openssl/thread.h>
     65 #include <openssl/x509.h>
     66 #include <openssl/x509v3.h>
     67 
     68 #include "../internal.h"
     69 
     70 
     71 /* Method to handle CRL access.
     72  * In general a CRL could be very large (several Mb) and can consume large
     73  * amounts of resources if stored in memory by multiple processes.
     74  * This method allows general CRL operations to be redirected to more
     75  * efficient callbacks: for example a CRL entry database.
     76  */
     77 
     78 #define X509_CRL_METHOD_DYNAMIC		1
     79 
     80 struct x509_crl_method_st
     81 	{
     82 	int flags;
     83 	int (*crl_init)(X509_CRL *crl);
     84 	int (*crl_free)(X509_CRL *crl);
     85 	int (*crl_lookup)(X509_CRL *crl, X509_REVOKED **ret,
     86 				ASN1_INTEGER *ser, X509_NAME *issuer);
     87 	int (*crl_verify)(X509_CRL *crl, EVP_PKEY *pk);
     88 	};
     89 
     90 static int X509_REVOKED_cmp(const X509_REVOKED **a,
     91 				const X509_REVOKED **b);
     92 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp);
     93 
     94 ASN1_SEQUENCE(X509_REVOKED) = {
     95 	ASN1_SIMPLE(X509_REVOKED,serialNumber, ASN1_INTEGER),
     96 	ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME),
     97 	ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION)
     98 } ASN1_SEQUENCE_END(X509_REVOKED)
     99 
    100 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r);
    101 static int def_crl_lookup(X509_CRL *crl,
    102 		X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer);
    103 
    104 static const X509_CRL_METHOD int_crl_meth =
    105 	{
    106 	0,
    107 	0,0,
    108 	def_crl_lookup,
    109 	def_crl_verify
    110 	};
    111 
    112 static const X509_CRL_METHOD *default_crl_method = &int_crl_meth;
    113 
    114 /* The X509_CRL_INFO structure needs a bit of customisation.
    115  * Since we cache the original encoding the signature wont be affected by
    116  * reordering of the revoked field.
    117  */
    118 static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
    119 								void *exarg)
    120 {
    121 	X509_CRL_INFO *a = (X509_CRL_INFO *)*pval;
    122 
    123 	if(!a || !a->revoked) return 1;
    124 	switch(operation) {
    125 		/* Just set cmp function here. We don't sort because that
    126 		 * would affect the output of X509_CRL_print().
    127 		 */
    128 		case ASN1_OP_D2I_POST:
    129 		(void)sk_X509_REVOKED_set_cmp_func(a->revoked,X509_REVOKED_cmp);
    130 		break;
    131 	}
    132 	return 1;
    133 }
    134 
    135 
    136 ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = {
    137 	ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER),
    138 	ASN1_SIMPLE(X509_CRL_INFO, sig_alg, X509_ALGOR),
    139 	ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME),
    140 	ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME),
    141 	ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME),
    142 	ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED),
    143 	ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0)
    144 } ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO)
    145 
    146 /* Set CRL entry issuer according to CRL certificate issuer extension.
    147  * Check for unhandled critical CRL entry extensions.
    148  */
    149 
    150 static int crl_set_issuers(X509_CRL *crl)
    151 	{
    152 
    153 	size_t i, k;
    154 	int j;
    155 	GENERAL_NAMES *gens, *gtmp;
    156 	STACK_OF(X509_REVOKED) *revoked;
    157 
    158 	revoked = X509_CRL_get_REVOKED(crl);
    159 
    160 	gens = NULL;
    161 	for (i = 0; i < sk_X509_REVOKED_num(revoked); i++)
    162 		{
    163 		X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i);
    164 		STACK_OF(X509_EXTENSION) *exts;
    165 		ASN1_ENUMERATED *reason;
    166 		X509_EXTENSION *ext;
    167 		gtmp = X509_REVOKED_get_ext_d2i(rev,
    168 						NID_certificate_issuer,
    169 						&j, NULL);
    170 		if (!gtmp && (j != -1))
    171 			{
    172 			crl->flags |= EXFLAG_INVALID;
    173 			return 1;
    174 			}
    175 
    176 		if (gtmp)
    177 			{
    178 			gens = gtmp;
    179 			if (!crl->issuers)
    180 				{
    181 				crl->issuers = sk_GENERAL_NAMES_new_null();
    182 				if (!crl->issuers)
    183 					return 0;
    184 				}
    185 			if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp))
    186 				return 0;
    187 			}
    188 		rev->issuer = gens;
    189 
    190 		reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason,
    191 								&j, NULL);
    192 		if (!reason && (j != -1))
    193 			{
    194 			crl->flags |= EXFLAG_INVALID;
    195 			return 1;
    196 			}
    197 
    198 		if (reason)
    199 			{
    200 			rev->reason = ASN1_ENUMERATED_get(reason);
    201 			ASN1_ENUMERATED_free(reason);
    202 			}
    203 		else
    204 			rev->reason = CRL_REASON_NONE;
    205 
    206 		/* Check for critical CRL entry extensions */
    207 
    208 		exts = rev->extensions;
    209 
    210 		for (k = 0; k < sk_X509_EXTENSION_num(exts); k++)
    211 			{
    212 			ext = sk_X509_EXTENSION_value(exts, k);
    213 			if (ext->critical > 0)
    214 				{
    215 				if (OBJ_obj2nid(ext->object) ==
    216 					NID_certificate_issuer)
    217 					continue;
    218 				crl->flags |= EXFLAG_CRITICAL;
    219 				break;
    220 				}
    221 			}
    222 
    223 
    224 		}
    225 
    226 	return 1;
    227 
    228 	}
    229 
    230 /* The X509_CRL structure needs a bit of customisation. Cache some extensions
    231  * and hash of the whole CRL.
    232  */
    233 static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
    234 								void *exarg)
    235 	{
    236 	X509_CRL *crl = (X509_CRL *)*pval;
    237 	STACK_OF(X509_EXTENSION) *exts;
    238 	X509_EXTENSION *ext;
    239 	size_t idx;
    240 
    241 	switch(operation)
    242 		{
    243 		case ASN1_OP_NEW_POST:
    244 		crl->idp = NULL;
    245 		crl->akid = NULL;
    246 		crl->flags = 0;
    247 		crl->idp_flags = 0;
    248 		crl->idp_reasons = CRLDP_ALL_REASONS;
    249 		crl->meth = default_crl_method;
    250 		crl->meth_data = NULL;
    251 		crl->issuers = NULL;
    252 		crl->crl_number = NULL;
    253 		crl->base_crl_number = NULL;
    254 		break;
    255 
    256 		case ASN1_OP_D2I_POST:
    257 		X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL);
    258 		crl->idp = X509_CRL_get_ext_d2i(crl,
    259 				NID_issuing_distribution_point, NULL, NULL);
    260 		if (crl->idp)
    261 			setup_idp(crl, crl->idp);
    262 
    263 		crl->akid = X509_CRL_get_ext_d2i(crl,
    264 				NID_authority_key_identifier, NULL, NULL);
    265 
    266 		crl->crl_number = X509_CRL_get_ext_d2i(crl,
    267 				NID_crl_number, NULL, NULL);
    268 
    269 		crl->base_crl_number = X509_CRL_get_ext_d2i(crl,
    270 				NID_delta_crl, NULL, NULL);
    271 		/* Delta CRLs must have CRL number */
    272 		if (crl->base_crl_number && !crl->crl_number)
    273 			crl->flags |= EXFLAG_INVALID;
    274 
    275 		/* See if we have any unhandled critical CRL extensions and
    276 		 * indicate this in a flag. We only currently handle IDP so
    277 		 * anything else critical sets the flag.
    278 		 *
    279 		 * This code accesses the X509_CRL structure directly:
    280 		 * applications shouldn't do this.
    281 		 */
    282 
    283 		exts = crl->crl->extensions;
    284 
    285 		for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++)
    286 			{
    287 			int nid;
    288 			ext = sk_X509_EXTENSION_value(exts, idx);
    289 			nid = OBJ_obj2nid(ext->object);
    290 			if (nid == NID_freshest_crl)
    291 				crl->flags |= EXFLAG_FRESHEST;
    292 			if (ext->critical > 0)
    293 				{
    294 				/* We handle IDP and deltas */
    295 				if ((nid == NID_issuing_distribution_point)
    296 					|| (nid == NID_authority_key_identifier)
    297 					|| (nid == NID_delta_crl))
    298 					break;;
    299 				crl->flags |= EXFLAG_CRITICAL;
    300 				break;
    301 				}
    302 			}
    303 
    304 
    305 		if (!crl_set_issuers(crl))
    306 			return 0;
    307 
    308 		if (crl->meth->crl_init)
    309 			{
    310 			if (crl->meth->crl_init(crl) == 0)
    311 				return 0;
    312 			}
    313 		break;
    314 
    315 		case ASN1_OP_FREE_POST:
    316 		if (crl->meth->crl_free)
    317 			{
    318 			if (!crl->meth->crl_free(crl))
    319 				return 0;
    320 			}
    321 		if (crl->akid)
    322 			AUTHORITY_KEYID_free(crl->akid);
    323 		if (crl->idp)
    324 			ISSUING_DIST_POINT_free(crl->idp);
    325 		ASN1_INTEGER_free(crl->crl_number);
    326 		ASN1_INTEGER_free(crl->base_crl_number);
    327 		sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
    328 		break;
    329 		}
    330 	return 1;
    331 	}
    332 
    333 /* Convert IDP into a more convenient form */
    334 
    335 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
    336 	{
    337 	int idp_only = 0;
    338 	/* Set various flags according to IDP */
    339 	crl->idp_flags |= IDP_PRESENT;
    340 	if (idp->onlyuser > 0)
    341 		{
    342 		idp_only++;
    343 		crl->idp_flags |= IDP_ONLYUSER;
    344 		}
    345 	if (idp->onlyCA > 0)
    346 		{
    347 		idp_only++;
    348 		crl->idp_flags |= IDP_ONLYCA;
    349 		}
    350 	if (idp->onlyattr > 0)
    351 		{
    352 		idp_only++;
    353 		crl->idp_flags |= IDP_ONLYATTR;
    354 		}
    355 
    356 	if (idp_only > 1)
    357 		crl->idp_flags |= IDP_INVALID;
    358 
    359 	if (idp->indirectCRL > 0)
    360 		crl->idp_flags |= IDP_INDIRECT;
    361 
    362 	if (idp->onlysomereasons)
    363 		{
    364 		crl->idp_flags |= IDP_REASONS;
    365 		if (idp->onlysomereasons->length > 0)
    366 			crl->idp_reasons = idp->onlysomereasons->data[0];
    367 		if (idp->onlysomereasons->length > 1)
    368 			crl->idp_reasons |=
    369 				(idp->onlysomereasons->data[1] << 8);
    370 		crl->idp_reasons &= CRLDP_ALL_REASONS;
    371 		}
    372 
    373 	DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
    374 	}
    375 
    376 ASN1_SEQUENCE_ref(X509_CRL, crl_cb) = {
    377 	ASN1_SIMPLE(X509_CRL, crl, X509_CRL_INFO),
    378 	ASN1_SIMPLE(X509_CRL, sig_alg, X509_ALGOR),
    379 	ASN1_SIMPLE(X509_CRL, signature, ASN1_BIT_STRING)
    380 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
    381 
    382 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
    383 IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED)
    384 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
    385 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
    386 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
    387 
    388 static int X509_REVOKED_cmp(const X509_REVOKED **a,
    389 			const X509_REVOKED **b)
    390 	{
    391 	return(ASN1_STRING_cmp(
    392 		(ASN1_STRING *)(*a)->serialNumber,
    393 		(ASN1_STRING *)(*b)->serialNumber));
    394 	}
    395 
    396 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
    397 {
    398 	X509_CRL_INFO *inf;
    399 	inf = crl->crl;
    400 	if(!inf->revoked)
    401 		inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
    402 	if(!inf->revoked || !sk_X509_REVOKED_push(inf->revoked, rev)) {
    403 		OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
    404 		return 0;
    405 	}
    406 	inf->enc.modified = 1;
    407 	return 1;
    408 }
    409 
    410 int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
    411 	{
    412 	if (crl->meth->crl_verify)
    413 		return crl->meth->crl_verify(crl, r);
    414 	return 0;
    415 	}
    416 
    417 int X509_CRL_get0_by_serial(X509_CRL *crl,
    418 		X509_REVOKED **ret, ASN1_INTEGER *serial)
    419 	{
    420 	if (crl->meth->crl_lookup)
    421 		return crl->meth->crl_lookup(crl, ret, serial, NULL);
    422 	return 0;
    423 	}
    424 
    425 int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
    426 	{
    427 	if (crl->meth->crl_lookup)
    428 		return crl->meth->crl_lookup(crl, ret,
    429 						X509_get_serialNumber(x),
    430 						X509_get_issuer_name(x));
    431 	return 0;
    432 	}
    433 
    434 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
    435 	{
    436 	return(ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
    437 		crl->sig_alg, crl->signature,crl->crl,r));
    438 	}
    439 
    440 static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm,
    441 						X509_REVOKED *rev)
    442 	{
    443 	size_t i;
    444 
    445 	if (!rev->issuer)
    446 		{
    447 		if (!nm)
    448 			return 1;
    449 		if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
    450 			return 1;
    451 		return 0;
    452 		}
    453 
    454 	if (!nm)
    455 		nm = X509_CRL_get_issuer(crl);
    456 
    457 	for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++)
    458 		{
    459 		GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
    460 		if (gen->type != GEN_DIRNAME)
    461 			continue;
    462 		if (!X509_NAME_cmp(nm, gen->d.directoryName))
    463 			return 1;
    464 		}
    465 	return 0;
    466 
    467 	}
    468 
    469 static struct CRYPTO_STATIC_MUTEX g_crl_sort_lock = CRYPTO_STATIC_MUTEX_INIT;
    470 
    471 static int def_crl_lookup(X509_CRL *crl,
    472 		X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer)
    473 	{
    474 	X509_REVOKED rtmp, *rev;
    475 	size_t idx;
    476 	rtmp.serialNumber = serial;
    477 	/* Sort revoked into serial number order if not already sorted.
    478 	 * Do this under a lock to avoid race condition.
    479 	 */
    480 
    481 	CRYPTO_STATIC_MUTEX_lock_read(&g_crl_sort_lock);
    482 	const int is_sorted = sk_X509_REVOKED_is_sorted(crl->crl->revoked);
    483 	CRYPTO_STATIC_MUTEX_unlock(&g_crl_sort_lock);
    484 
    485 	if (!is_sorted)
    486 		{
    487 		CRYPTO_STATIC_MUTEX_lock_write(&g_crl_sort_lock);
    488 		if (!sk_X509_REVOKED_is_sorted(crl->crl->revoked))
    489 			{
    490 			sk_X509_REVOKED_sort(crl->crl->revoked);
    491 			}
    492 		CRYPTO_STATIC_MUTEX_unlock(&g_crl_sort_lock);
    493 		}
    494 
    495 	if (!sk_X509_REVOKED_find(crl->crl->revoked, &idx, &rtmp))
    496 		return 0;
    497 	/* Need to look for matching name */
    498 	for(;idx < sk_X509_REVOKED_num(crl->crl->revoked); idx++)
    499 		{
    500 		rev = sk_X509_REVOKED_value(crl->crl->revoked, idx);
    501 		if (ASN1_INTEGER_cmp(rev->serialNumber, serial))
    502 			return 0;
    503 		if (crl_revoked_issuer_match(crl, issuer, rev))
    504 			{
    505 			if (ret)
    506 				*ret = rev;
    507 			if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
    508 				return 2;
    509 			return 1;
    510 			}
    511 		}
    512 	return 0;
    513 	}
    514 
    515 void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
    516 	{
    517 	if (meth == NULL)
    518 		default_crl_method = &int_crl_meth;
    519 	else
    520 		default_crl_method = meth;
    521 	}
    522 
    523 X509_CRL_METHOD *X509_CRL_METHOD_new(
    524 	int (*crl_init)(X509_CRL *crl),
    525 	int (*crl_free)(X509_CRL *crl),
    526 	int (*crl_lookup)(X509_CRL *crl, X509_REVOKED **ret,
    527 				ASN1_INTEGER *ser, X509_NAME *issuer),
    528 	int (*crl_verify)(X509_CRL *crl, EVP_PKEY *pk))
    529 	{
    530 	X509_CRL_METHOD *m;
    531 	m = OPENSSL_malloc(sizeof(X509_CRL_METHOD));
    532 	if (!m)
    533 		return NULL;
    534 	m->crl_init = crl_init;
    535 	m->crl_free = crl_free;
    536 	m->crl_lookup = crl_lookup;
    537 	m->crl_verify = crl_verify;
    538 	m->flags = X509_CRL_METHOD_DYNAMIC;
    539 	return m;
    540 	}
    541 
    542 void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
    543 	{
    544 	if (!(m->flags & X509_CRL_METHOD_DYNAMIC))
    545 		return;
    546 	OPENSSL_free(m);
    547 	}
    548 
    549 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
    550 	{
    551 	crl->meth_data = dat;
    552 	}
    553 
    554 void *X509_CRL_get_meth_data(X509_CRL *crl)
    555 	{
    556 	return crl->meth_data;
    557 	}
    558 
    559 IMPLEMENT_ASN1_SET_OF(X509_REVOKED)
    560 IMPLEMENT_ASN1_SET_OF(X509_CRL)
    561