1/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@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@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@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@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/x509.h>
65#include <openssl/x509v3.h>
66
67#include "../asn1/asn1_locl.h"
68
69
70static int X509_REVOKED_cmp(const X509_REVOKED **a,
71				const X509_REVOKED **b);
72static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp);
73
74ASN1_SEQUENCE(X509_REVOKED) = {
75	ASN1_SIMPLE(X509_REVOKED,serialNumber, ASN1_INTEGER),
76	ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME),
77	ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION)
78} ASN1_SEQUENCE_END(X509_REVOKED)
79
80static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r);
81static int def_crl_lookup(X509_CRL *crl,
82		X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer);
83
84static X509_CRL_METHOD int_crl_meth =
85	{
86	0,
87	0,0,
88	def_crl_lookup,
89	def_crl_verify
90	};
91
92static const X509_CRL_METHOD *default_crl_method = &int_crl_meth;
93
94/* The X509_CRL_INFO structure needs a bit of customisation.
95 * Since we cache the original encoding the signature wont be affected by
96 * reordering of the revoked field.
97 */
98static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
99								void *exarg)
100{
101	X509_CRL_INFO *a = (X509_CRL_INFO *)*pval;
102
103	if(!a || !a->revoked) return 1;
104	switch(operation) {
105		/* Just set cmp function here. We don't sort because that
106		 * would affect the output of X509_CRL_print().
107		 */
108		case ASN1_OP_D2I_POST:
109		(void)sk_X509_REVOKED_set_cmp_func(a->revoked,X509_REVOKED_cmp);
110		break;
111	}
112	return 1;
113}
114
115
116ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = {
117	ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER),
118	ASN1_SIMPLE(X509_CRL_INFO, sig_alg, X509_ALGOR),
119	ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME),
120	ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME),
121	ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME),
122	ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED),
123	ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0)
124} ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO)
125
126/* Set CRL entry issuer according to CRL certificate issuer extension.
127 * Check for unhandled critical CRL entry extensions.
128 */
129
130static int crl_set_issuers(X509_CRL *crl)
131	{
132
133	size_t i, k;
134	int j;
135	GENERAL_NAMES *gens, *gtmp;
136	STACK_OF(X509_REVOKED) *revoked;
137
138	revoked = X509_CRL_get_REVOKED(crl);
139
140	gens = NULL;
141	for (i = 0; i < sk_X509_REVOKED_num(revoked); i++)
142		{
143		X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i);
144		STACK_OF(X509_EXTENSION) *exts;
145		ASN1_ENUMERATED *reason;
146		X509_EXTENSION *ext;
147		gtmp = X509_REVOKED_get_ext_d2i(rev,
148						NID_certificate_issuer,
149						&j, NULL);
150		if (!gtmp && (j != -1))
151			{
152			crl->flags |= EXFLAG_INVALID;
153			return 1;
154			}
155
156		if (gtmp)
157			{
158			gens = gtmp;
159			if (!crl->issuers)
160				{
161				crl->issuers = sk_GENERAL_NAMES_new_null();
162				if (!crl->issuers)
163					return 0;
164				}
165			if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp))
166				return 0;
167			}
168		rev->issuer = gens;
169
170		reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason,
171								&j, NULL);
172		if (!reason && (j != -1))
173			{
174			crl->flags |= EXFLAG_INVALID;
175			return 1;
176			}
177
178		if (reason)
179			{
180			rev->reason = ASN1_ENUMERATED_get(reason);
181			ASN1_ENUMERATED_free(reason);
182			}
183		else
184			rev->reason = CRL_REASON_NONE;
185
186		/* Check for critical CRL entry extensions */
187
188		exts = rev->extensions;
189
190		for (k = 0; k < sk_X509_EXTENSION_num(exts); k++)
191			{
192			ext = sk_X509_EXTENSION_value(exts, k);
193			if (ext->critical > 0)
194				{
195				if (OBJ_obj2nid(ext->object) ==
196					NID_certificate_issuer)
197					continue;
198				crl->flags |= EXFLAG_CRITICAL;
199				break;
200				}
201			}
202
203
204		}
205
206	return 1;
207
208	}
209
210/* The X509_CRL structure needs a bit of customisation. Cache some extensions
211 * and hash of the whole CRL.
212 */
213static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
214								void *exarg)
215	{
216	X509_CRL *crl = (X509_CRL *)*pval;
217	STACK_OF(X509_EXTENSION) *exts;
218	X509_EXTENSION *ext;
219	size_t idx;
220
221	switch(operation)
222		{
223		case ASN1_OP_NEW_POST:
224		crl->idp = NULL;
225		crl->akid = NULL;
226		crl->flags = 0;
227		crl->idp_flags = 0;
228		crl->idp_reasons = CRLDP_ALL_REASONS;
229		crl->meth = default_crl_method;
230		crl->meth_data = NULL;
231		crl->issuers = NULL;
232		crl->crl_number = NULL;
233		crl->base_crl_number = NULL;
234		break;
235
236		case ASN1_OP_D2I_POST:
237		X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL);
238		crl->idp = X509_CRL_get_ext_d2i(crl,
239				NID_issuing_distribution_point, NULL, NULL);
240		if (crl->idp)
241			setup_idp(crl, crl->idp);
242
243		crl->akid = X509_CRL_get_ext_d2i(crl,
244				NID_authority_key_identifier, NULL, NULL);
245
246		crl->crl_number = X509_CRL_get_ext_d2i(crl,
247				NID_crl_number, NULL, NULL);
248
249		crl->base_crl_number = X509_CRL_get_ext_d2i(crl,
250				NID_delta_crl, NULL, NULL);
251		/* Delta CRLs must have CRL number */
252		if (crl->base_crl_number && !crl->crl_number)
253			crl->flags |= EXFLAG_INVALID;
254
255		/* See if we have any unhandled critical CRL extensions and
256		 * indicate this in a flag. We only currently handle IDP so
257		 * anything else critical sets the flag.
258		 *
259		 * This code accesses the X509_CRL structure directly:
260		 * applications shouldn't do this.
261		 */
262
263		exts = crl->crl->extensions;
264
265		for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++)
266			{
267			int nid;
268			ext = sk_X509_EXTENSION_value(exts, idx);
269			nid = OBJ_obj2nid(ext->object);
270			if (nid == NID_freshest_crl)
271				crl->flags |= EXFLAG_FRESHEST;
272			if (ext->critical > 0)
273				{
274				/* We handle IDP and deltas */
275				if ((nid == NID_issuing_distribution_point)
276					|| (nid == NID_authority_key_identifier)
277					|| (nid == NID_delta_crl))
278					break;;
279				crl->flags |= EXFLAG_CRITICAL;
280				break;
281				}
282			}
283
284
285		if (!crl_set_issuers(crl))
286			return 0;
287
288		if (crl->meth->crl_init)
289			{
290			if (crl->meth->crl_init(crl) == 0)
291				return 0;
292			}
293		break;
294
295		case ASN1_OP_FREE_POST:
296		if (crl->meth->crl_free)
297			{
298			if (!crl->meth->crl_free(crl))
299				return 0;
300			}
301		if (crl->akid)
302			AUTHORITY_KEYID_free(crl->akid);
303		if (crl->idp)
304			ISSUING_DIST_POINT_free(crl->idp);
305		ASN1_INTEGER_free(crl->crl_number);
306		ASN1_INTEGER_free(crl->base_crl_number);
307		sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
308		break;
309		}
310	return 1;
311	}
312
313/* Convert IDP into a more convenient form */
314
315static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
316	{
317	int idp_only = 0;
318	/* Set various flags according to IDP */
319	crl->idp_flags |= IDP_PRESENT;
320	if (idp->onlyuser > 0)
321		{
322		idp_only++;
323		crl->idp_flags |= IDP_ONLYUSER;
324		}
325	if (idp->onlyCA > 0)
326		{
327		idp_only++;
328		crl->idp_flags |= IDP_ONLYCA;
329		}
330	if (idp->onlyattr > 0)
331		{
332		idp_only++;
333		crl->idp_flags |= IDP_ONLYATTR;
334		}
335
336	if (idp_only > 1)
337		crl->idp_flags |= IDP_INVALID;
338
339	if (idp->indirectCRL > 0)
340		crl->idp_flags |= IDP_INDIRECT;
341
342	if (idp->onlysomereasons)
343		{
344		crl->idp_flags |= IDP_REASONS;
345		if (idp->onlysomereasons->length > 0)
346			crl->idp_reasons = idp->onlysomereasons->data[0];
347		if (idp->onlysomereasons->length > 1)
348			crl->idp_reasons |=
349				(idp->onlysomereasons->data[1] << 8);
350		crl->idp_reasons &= CRLDP_ALL_REASONS;
351		}
352
353	DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
354	}
355
356ASN1_SEQUENCE_ref(X509_CRL, crl_cb, CRYPTO_LOCK_X509_CRL) = {
357	ASN1_SIMPLE(X509_CRL, crl, X509_CRL_INFO),
358	ASN1_SIMPLE(X509_CRL, sig_alg, X509_ALGOR),
359	ASN1_SIMPLE(X509_CRL, signature, ASN1_BIT_STRING)
360} ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
361
362IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
363IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED)
364IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
365IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
366IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
367
368static int X509_REVOKED_cmp(const X509_REVOKED **a,
369			const X509_REVOKED **b)
370	{
371	return(ASN1_STRING_cmp(
372		(ASN1_STRING *)(*a)->serialNumber,
373		(ASN1_STRING *)(*b)->serialNumber));
374	}
375
376int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
377{
378	X509_CRL_INFO *inf;
379	inf = crl->crl;
380	if(!inf->revoked)
381		inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
382	if(!inf->revoked || !sk_X509_REVOKED_push(inf->revoked, rev)) {
383		OPENSSL_PUT_ERROR(X509, X509_CRL_add0_revoked, ERR_R_MALLOC_FAILURE);
384		return 0;
385	}
386	inf->enc.modified = 1;
387	return 1;
388}
389
390int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
391	{
392	if (crl->meth->crl_verify)
393		return crl->meth->crl_verify(crl, r);
394	return 0;
395	}
396
397int X509_CRL_get0_by_serial(X509_CRL *crl,
398		X509_REVOKED **ret, ASN1_INTEGER *serial)
399	{
400	if (crl->meth->crl_lookup)
401		return crl->meth->crl_lookup(crl, ret, serial, NULL);
402	return 0;
403	}
404
405int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
406	{
407	if (crl->meth->crl_lookup)
408		return crl->meth->crl_lookup(crl, ret,
409						X509_get_serialNumber(x),
410						X509_get_issuer_name(x));
411	return 0;
412	}
413
414static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
415	{
416	return(ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
417		crl->sig_alg, crl->signature,crl->crl,r));
418	}
419
420static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm,
421						X509_REVOKED *rev)
422	{
423	size_t i;
424
425	if (!rev->issuer)
426		{
427		if (!nm)
428			return 1;
429		if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
430			return 1;
431		return 0;
432		}
433
434	if (!nm)
435		nm = X509_CRL_get_issuer(crl);
436
437	for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++)
438		{
439		GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
440		if (gen->type != GEN_DIRNAME)
441			continue;
442		if (!X509_NAME_cmp(nm, gen->d.directoryName))
443			return 1;
444		}
445	return 0;
446
447	}
448
449static int def_crl_lookup(X509_CRL *crl,
450		X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer)
451	{
452	X509_REVOKED rtmp, *rev;
453	size_t idx;
454	rtmp.serialNumber = serial;
455	/* Sort revoked into serial number order if not already sorted.
456	 * Do this under a lock to avoid race condition.
457 	 */
458	if (!sk_X509_REVOKED_is_sorted(crl->crl->revoked))
459		{
460		CRYPTO_w_lock(CRYPTO_LOCK_X509_CRL);
461		sk_X509_REVOKED_sort(crl->crl->revoked);
462		CRYPTO_w_unlock(CRYPTO_LOCK_X509_CRL);
463		}
464	if (!sk_X509_REVOKED_find(crl->crl->revoked, &idx, &rtmp))
465		return 0;
466	/* Need to look for matching name */
467	for(;idx < sk_X509_REVOKED_num(crl->crl->revoked); idx++)
468		{
469		rev = sk_X509_REVOKED_value(crl->crl->revoked, idx);
470		if (ASN1_INTEGER_cmp(rev->serialNumber, serial))
471			return 0;
472		if (crl_revoked_issuer_match(crl, issuer, rev))
473			{
474			if (ret)
475				*ret = rev;
476			if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
477				return 2;
478			return 1;
479			}
480		}
481	return 0;
482	}
483
484void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
485	{
486	if (meth == NULL)
487		default_crl_method = &int_crl_meth;
488	else
489		default_crl_method = meth;
490	}
491
492X509_CRL_METHOD *X509_CRL_METHOD_new(
493	int (*crl_init)(X509_CRL *crl),
494	int (*crl_free)(X509_CRL *crl),
495	int (*crl_lookup)(X509_CRL *crl, X509_REVOKED **ret,
496				ASN1_INTEGER *ser, X509_NAME *issuer),
497	int (*crl_verify)(X509_CRL *crl, EVP_PKEY *pk))
498	{
499	X509_CRL_METHOD *m;
500	m = OPENSSL_malloc(sizeof(X509_CRL_METHOD));
501	if (!m)
502		return NULL;
503	m->crl_init = crl_init;
504	m->crl_free = crl_free;
505	m->crl_lookup = crl_lookup;
506	m->crl_verify = crl_verify;
507	m->flags = X509_CRL_METHOD_DYNAMIC;
508	return m;
509	}
510
511void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
512	{
513	if (!(m->flags & X509_CRL_METHOD_DYNAMIC))
514		return;
515	OPENSSL_free(m);
516	}
517
518void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
519	{
520	crl->meth_data = dat;
521	}
522
523void *X509_CRL_get_meth_data(X509_CRL *crl)
524	{
525	return crl->meth_data;
526	}
527
528IMPLEMENT_ASN1_SET_OF(X509_REVOKED)
529IMPLEMENT_ASN1_SET_OF(X509_CRL)
530