1/* crypto/asn1/x_crl.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 * 
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 * 
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 * 
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from 
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 * 
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 * 
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#include <stdio.h>
60#include "cryptlib.h"
61#include "asn1_locl.h"
62#include <openssl/asn1t.h>
63#include <openssl/x509.h>
64#include <openssl/x509v3.h>
65
66static int X509_REVOKED_cmp(const X509_REVOKED * const *a,
67				const X509_REVOKED * const *b);
68static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp);
69
70ASN1_SEQUENCE(X509_REVOKED) = {
71	ASN1_SIMPLE(X509_REVOKED,serialNumber, ASN1_INTEGER),
72	ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME),
73	ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION)
74} ASN1_SEQUENCE_END(X509_REVOKED)
75
76static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r);
77static int def_crl_lookup(X509_CRL *crl,
78		X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer);
79
80static X509_CRL_METHOD int_crl_meth =
81	{
82	0,
83	0,0,
84	def_crl_lookup,
85	def_crl_verify
86	};
87
88static const X509_CRL_METHOD *default_crl_method = &int_crl_meth;
89
90/* The X509_CRL_INFO structure needs a bit of customisation.
91 * Since we cache the original encoding the signature wont be affected by
92 * reordering of the revoked field.
93 */
94static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
95								void *exarg)
96{
97	X509_CRL_INFO *a = (X509_CRL_INFO *)*pval;
98
99	if(!a || !a->revoked) return 1;
100	switch(operation) {
101		/* Just set cmp function here. We don't sort because that
102		 * would affect the output of X509_CRL_print().
103		 */
104		case ASN1_OP_D2I_POST:
105		(void)sk_X509_REVOKED_set_cmp_func(a->revoked,X509_REVOKED_cmp);
106		break;
107	}
108	return 1;
109}
110
111
112ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = {
113	ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER),
114	ASN1_SIMPLE(X509_CRL_INFO, sig_alg, X509_ALGOR),
115	ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME),
116	ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME),
117	ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME),
118	ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED),
119	ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0)
120} ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO)
121
122/* Set CRL entry issuer according to CRL certificate issuer extension.
123 * Check for unhandled critical CRL entry extensions.
124 */
125
126static int crl_set_issuers(X509_CRL *crl)
127	{
128
129	int i, j;
130	GENERAL_NAMES *gens, *gtmp;
131	STACK_OF(X509_REVOKED) *revoked;
132
133	revoked = X509_CRL_get_REVOKED(crl);
134
135	gens = NULL;
136	for (i = 0; i < sk_X509_REVOKED_num(revoked); i++)
137		{
138		X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i);
139		STACK_OF(X509_EXTENSION) *exts;
140		ASN1_ENUMERATED *reason;
141		X509_EXTENSION *ext;
142		gtmp = X509_REVOKED_get_ext_d2i(rev, 
143						NID_certificate_issuer,
144						&j, NULL);
145		if (!gtmp && (j != -1))
146			{
147			crl->flags |= EXFLAG_INVALID;
148			return 1;
149			}
150
151		if (gtmp)
152			{
153			gens = gtmp;
154			if (!crl->issuers)
155				{
156				crl->issuers = sk_GENERAL_NAMES_new_null();
157				if (!crl->issuers)
158					return 0;
159				}
160			if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp))
161				return 0;
162			}
163		rev->issuer = gens;
164
165		reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason,
166								&j, NULL);
167		if (!reason && (j != -1))
168			{
169			crl->flags |= EXFLAG_INVALID;
170			return 1;
171			}
172
173		if (reason)
174			{
175			rev->reason = ASN1_ENUMERATED_get(reason);
176			ASN1_ENUMERATED_free(reason);
177			}
178		else
179			rev->reason = CRL_REASON_NONE;	
180
181		/* Check for critical CRL entry extensions */
182
183		exts = rev->extensions;
184
185		for (j = 0; j < sk_X509_EXTENSION_num(exts); j++)
186			{
187			ext = sk_X509_EXTENSION_value(exts, j);
188			if (ext->critical > 0)
189				{
190				if (OBJ_obj2nid(ext->object) ==
191					NID_certificate_issuer)
192					continue;
193				crl->flags |= EXFLAG_CRITICAL;
194				break;
195				}
196			}
197
198
199		}
200
201	return 1;
202
203	}
204
205/* The X509_CRL structure needs a bit of customisation. Cache some extensions
206 * and hash of the whole CRL.
207 */
208static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
209								void *exarg)
210	{
211	X509_CRL *crl = (X509_CRL *)*pval;
212	STACK_OF(X509_EXTENSION) *exts;
213	X509_EXTENSION *ext;
214	int idx;
215
216	switch(operation)
217		{
218		case ASN1_OP_NEW_POST:
219		crl->idp = NULL;
220		crl->akid = NULL;
221		crl->flags = 0;
222		crl->idp_flags = 0;
223		crl->idp_reasons = CRLDP_ALL_REASONS;
224		crl->meth = default_crl_method;
225		crl->meth_data = NULL;
226		crl->issuers = NULL;
227		crl->crl_number = NULL;
228		crl->base_crl_number = NULL;
229		break;
230
231		case ASN1_OP_D2I_POST:
232#ifndef OPENSSL_NO_SHA
233		X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL);
234#endif
235		crl->idp = X509_CRL_get_ext_d2i(crl,
236				NID_issuing_distribution_point, NULL, NULL);
237		if (crl->idp)
238			setup_idp(crl, crl->idp);
239
240		crl->akid = X509_CRL_get_ext_d2i(crl,
241				NID_authority_key_identifier, NULL, NULL);	
242
243		crl->crl_number = X509_CRL_get_ext_d2i(crl,
244				NID_crl_number, NULL, NULL);	
245
246		crl->base_crl_number = X509_CRL_get_ext_d2i(crl,
247				NID_delta_crl, NULL, NULL);	
248		/* Delta CRLs must have CRL number */
249		if (crl->base_crl_number && !crl->crl_number)
250			crl->flags |= EXFLAG_INVALID;
251
252		/* See if we have any unhandled critical CRL extensions and 
253		 * indicate this in a flag. We only currently handle IDP so
254		 * anything else critical sets the flag.
255		 *
256		 * This code accesses the X509_CRL structure directly:
257		 * applications shouldn't do this.
258		 */
259
260		exts = crl->crl->extensions;
261
262		for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++)
263			{
264			int nid;
265			ext = sk_X509_EXTENSION_value(exts, idx);
266			nid = OBJ_obj2nid(ext->object);
267			if (nid == NID_freshest_crl)
268				crl->flags |= EXFLAG_FRESHEST;
269			if (ext->critical > 0)
270				{
271				/* We handle IDP and deltas */
272				if ((nid == NID_issuing_distribution_point)
273					|| (nid == NID_delta_crl))
274					break;;
275				crl->flags |= EXFLAG_CRITICAL;
276				break;
277				}
278			}
279
280
281		if (!crl_set_issuers(crl))
282			return 0;
283
284		if (crl->meth->crl_init)
285			{
286			if (crl->meth->crl_init(crl) == 0)
287				return 0;
288			}
289		break;
290
291		case ASN1_OP_FREE_POST:
292		if (crl->meth->crl_free)
293			{
294			if (!crl->meth->crl_free(crl))
295				return 0;
296			}
297		if (crl->akid)
298			AUTHORITY_KEYID_free(crl->akid);
299		if (crl->idp)
300			ISSUING_DIST_POINT_free(crl->idp);
301		ASN1_INTEGER_free(crl->crl_number);
302		ASN1_INTEGER_free(crl->base_crl_number);
303		sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
304		break;
305		}
306	return 1;
307	}
308
309/* Convert IDP into a more convenient form */
310
311static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
312	{
313	int idp_only = 0;
314	/* Set various flags according to IDP */
315	crl->idp_flags |= IDP_PRESENT;
316	if (idp->onlyuser > 0)
317		{
318		idp_only++;
319		crl->idp_flags |= IDP_ONLYUSER;
320		}
321	if (idp->onlyCA > 0)
322		{
323		idp_only++;
324		crl->idp_flags |= IDP_ONLYCA;
325		}
326	if (idp->onlyattr > 0)
327		{
328		idp_only++;
329		crl->idp_flags |= IDP_ONLYATTR;
330		}
331
332	if (idp_only > 1)
333		crl->idp_flags |= IDP_INVALID;
334
335	if (idp->indirectCRL > 0)
336		crl->idp_flags |= IDP_INDIRECT;
337
338	if (idp->onlysomereasons)
339		{
340		crl->idp_flags |= IDP_REASONS;
341		if (idp->onlysomereasons->length > 0)
342			crl->idp_reasons = idp->onlysomereasons->data[0];
343		if (idp->onlysomereasons->length > 1)
344			crl->idp_reasons |=
345				(idp->onlysomereasons->data[1] << 8);
346		crl->idp_reasons &= CRLDP_ALL_REASONS;
347		}
348
349	DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
350	}
351
352ASN1_SEQUENCE_ref(X509_CRL, crl_cb, CRYPTO_LOCK_X509_CRL) = {
353	ASN1_SIMPLE(X509_CRL, crl, X509_CRL_INFO),
354	ASN1_SIMPLE(X509_CRL, sig_alg, X509_ALGOR),
355	ASN1_SIMPLE(X509_CRL, signature, ASN1_BIT_STRING)
356} ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
357
358IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
359IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
360IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
361IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
362
363static int X509_REVOKED_cmp(const X509_REVOKED * const *a,
364			const X509_REVOKED * const *b)
365	{
366	return(ASN1_STRING_cmp(
367		(ASN1_STRING *)(*a)->serialNumber,
368		(ASN1_STRING *)(*b)->serialNumber));
369	}
370
371int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
372{
373	X509_CRL_INFO *inf;
374	inf = crl->crl;
375	if(!inf->revoked)
376		inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
377	if(!inf->revoked || !sk_X509_REVOKED_push(inf->revoked, rev)) {
378		ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE);
379		return 0;
380	}
381	inf->enc.modified = 1;
382	return 1;
383}
384
385int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
386	{
387	if (crl->meth->crl_verify)
388		return crl->meth->crl_verify(crl, r);
389	return 0;
390	}
391
392int X509_CRL_get0_by_serial(X509_CRL *crl,
393		X509_REVOKED **ret, ASN1_INTEGER *serial)
394	{
395	if (crl->meth->crl_lookup)
396		return crl->meth->crl_lookup(crl, ret, serial, NULL);
397	return 0;
398	}
399
400int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
401	{
402	if (crl->meth->crl_lookup)
403		return crl->meth->crl_lookup(crl, ret,
404						X509_get_serialNumber(x),
405						X509_get_issuer_name(x));
406	return 0;
407	}
408
409static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
410	{
411	return(ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
412		crl->sig_alg, crl->signature,crl->crl,r));
413	}
414
415static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm,
416						X509_REVOKED *rev)
417	{
418	int i;
419
420	if (!rev->issuer)
421		{
422		if (!nm)
423			return 1;
424		if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
425			return 1;
426		return 0;
427		}
428
429	if (!nm)
430		nm = X509_CRL_get_issuer(crl);
431
432	for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++)
433		{
434		GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
435		if (gen->type != GEN_DIRNAME)
436			continue;
437		if (!X509_NAME_cmp(nm, gen->d.directoryName))
438			return 1;
439		}
440	return 0;
441
442	}
443
444static int def_crl_lookup(X509_CRL *crl,
445		X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer)
446	{
447	X509_REVOKED rtmp, *rev;
448	int idx;
449	rtmp.serialNumber = serial;
450	/* Sort revoked into serial number order if not already sorted.
451	 * Do this under a lock to avoid race condition.
452 	 */
453	if (!sk_X509_REVOKED_is_sorted(crl->crl->revoked))
454		{
455		CRYPTO_w_lock(CRYPTO_LOCK_X509_CRL);
456		sk_X509_REVOKED_sort(crl->crl->revoked);
457		CRYPTO_w_unlock(CRYPTO_LOCK_X509_CRL);
458		}
459	idx = sk_X509_REVOKED_find(crl->crl->revoked, &rtmp);
460	if(idx < 0)
461		return 0;
462	/* Need to look for matching name */
463	for(;idx < sk_X509_REVOKED_num(crl->crl->revoked); idx++)
464		{
465		rev = sk_X509_REVOKED_value(crl->crl->revoked, idx);
466		if (ASN1_INTEGER_cmp(rev->serialNumber, serial))
467			return 0;
468		if (crl_revoked_issuer_match(crl, issuer, rev))
469			{
470			if (ret)
471				*ret = rev;
472			if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
473				return 2;
474			return 1;
475			}
476		}
477	return 0;
478	}
479
480void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
481	{
482	if (meth == NULL)
483		default_crl_method = &int_crl_meth;
484	else 
485		default_crl_method = meth;
486	}
487
488X509_CRL_METHOD *X509_CRL_METHOD_new(
489	int (*crl_init)(X509_CRL *crl),
490	int (*crl_free)(X509_CRL *crl),
491	int (*crl_lookup)(X509_CRL *crl, X509_REVOKED **ret,
492				ASN1_INTEGER *ser, X509_NAME *issuer),
493	int (*crl_verify)(X509_CRL *crl, EVP_PKEY *pk))
494	{
495	X509_CRL_METHOD *m;
496	m = OPENSSL_malloc(sizeof(X509_CRL_METHOD));
497	if (!m)
498		return NULL;
499	m->crl_init = crl_init;
500	m->crl_free = crl_free;
501	m->crl_lookup = crl_lookup;
502	m->crl_verify = crl_verify;
503	m->flags = X509_CRL_METHOD_DYNAMIC;
504	return m;
505	}
506
507void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
508	{
509	if (!(m->flags & X509_CRL_METHOD_DYNAMIC))
510		return;
511	OPENSSL_free(m);
512	}
513
514void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
515	{
516	crl->meth_data = dat;
517	}
518
519void *X509_CRL_get_meth_data(X509_CRL *crl)
520	{
521	return crl->meth_data;
522	}
523
524IMPLEMENT_STACK_OF(X509_REVOKED)
525IMPLEMENT_ASN1_SET_OF(X509_REVOKED)
526IMPLEMENT_STACK_OF(X509_CRL)
527IMPLEMENT_ASN1_SET_OF(X509_CRL)
528