1/* x509_vpm.c */
2/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
3 * project 2004.
4 */
5/* ====================================================================
6 * Copyright (c) 2004 The OpenSSL Project.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in
17 *    the documentation and/or other materials provided with the
18 *    distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 *    software must display the following acknowledgment:
22 *    "This product includes software developed by the OpenSSL Project
23 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 *    endorse or promote products derived from this software without
27 *    prior written permission. For written permission, please contact
28 *    licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 *    nor may "OpenSSL" appear in their names without prior written
32 *    permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 *    acknowledgment:
36 *    "This product includes software developed by the OpenSSL Project
37 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com).  This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59#include <stdio.h>
60
61#include "cryptlib.h"
62#include <openssl/crypto.h>
63#include <openssl/lhash.h>
64#include <openssl/buffer.h>
65#include <openssl/x509.h>
66#include <openssl/x509v3.h>
67
68/* X509_VERIFY_PARAM functions */
69
70static void x509_verify_param_zero(X509_VERIFY_PARAM *param)
71	{
72	if (!param)
73		return;
74	param->name = NULL;
75	param->purpose = 0;
76	param->trust = 0;
77	param->inh_flags = X509_VP_FLAG_DEFAULT;
78	param->flags = 0;
79	param->depth = -1;
80	if (param->policies)
81		{
82		sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
83		param->policies = NULL;
84		}
85	}
86
87X509_VERIFY_PARAM *X509_VERIFY_PARAM_new(void)
88	{
89	X509_VERIFY_PARAM *param;
90	param = OPENSSL_malloc(sizeof(X509_VERIFY_PARAM));
91	memset(param, 0, sizeof(X509_VERIFY_PARAM));
92	x509_verify_param_zero(param);
93	return param;
94	}
95
96void X509_VERIFY_PARAM_free(X509_VERIFY_PARAM *param)
97	{
98	x509_verify_param_zero(param);
99	OPENSSL_free(param);
100	}
101
102/* This function determines how parameters are "inherited" from one structure
103 * to another. There are several different ways this can happen.
104 *
105 * 1. If a child structure needs to have its values initialized from a parent
106 *    they are simply copied across. For example SSL_CTX copied to SSL.
107 * 2. If the structure should take on values only if they are currently unset.
108 *    For example the values in an SSL structure will take appropriate value
109 *    for SSL servers or clients but only if the application has not set new
110 *    ones.
111 *
112 * The "inh_flags" field determines how this function behaves.
113 *
114 * Normally any values which are set in the default are not copied from the
115 * destination and verify flags are ORed together.
116 *
117 * If X509_VP_FLAG_DEFAULT is set then anything set in the source is copied
118 * to the destination. Effectively the values in "to" become default values
119 * which will be used only if nothing new is set in "from".
120 *
121 * If X509_VP_FLAG_OVERWRITE is set then all value are copied across whether
122 * they are set or not. Flags is still Ored though.
123 *
124 * If X509_VP_FLAG_RESET_FLAGS is set then the flags value is copied instead
125 * of ORed.
126 *
127 * If X509_VP_FLAG_LOCKED is set then no values are copied.
128 *
129 * If X509_VP_FLAG_ONCE is set then the current inh_flags setting is zeroed
130 * after the next call.
131 */
132
133/* Macro to test if a field should be copied from src to dest */
134
135#define test_x509_verify_param_copy(field, def) \
136	(to_overwrite || \
137		((src->field != def) && (to_default || (dest->field == def))))
138
139/* Macro to test and copy a field if necessary */
140
141#define x509_verify_param_copy(field, def) \
142	if (test_x509_verify_param_copy(field, def)) \
143		dest->field = src->field
144
145
146int X509_VERIFY_PARAM_inherit(X509_VERIFY_PARAM *dest,
147						const X509_VERIFY_PARAM *src)
148	{
149	unsigned long inh_flags;
150	int to_default, to_overwrite;
151	if (!src)
152		return 1;
153	inh_flags = dest->inh_flags | src->inh_flags;
154
155	if (inh_flags & X509_VP_FLAG_ONCE)
156		dest->inh_flags = 0;
157
158	if (inh_flags & X509_VP_FLAG_LOCKED)
159		return 1;
160
161	if (inh_flags & X509_VP_FLAG_DEFAULT)
162		to_default = 1;
163	else
164		to_default = 0;
165
166	if (inh_flags & X509_VP_FLAG_OVERWRITE)
167		to_overwrite = 1;
168	else
169		to_overwrite = 0;
170
171	x509_verify_param_copy(purpose, 0);
172	x509_verify_param_copy(trust, 0);
173	x509_verify_param_copy(depth, -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))
178		{
179		dest->check_time = src->check_time;
180		dest->flags &= ~X509_V_FLAG_USE_CHECK_TIME;
181		/* Don't need to copy flag: that is done below */
182		}
183
184	if (inh_flags & X509_VP_FLAG_RESET_FLAGS)
185		dest->flags = 0;
186
187	dest->flags |= src->flags;
188
189	if (test_x509_verify_param_copy(policies, NULL))
190		{
191		if (!X509_VERIFY_PARAM_set1_policies(dest, src->policies))
192			return 0;
193		}
194
195	return 1;
196	}
197
198int X509_VERIFY_PARAM_set1(X509_VERIFY_PARAM *to,
199						const X509_VERIFY_PARAM *from)
200	{
201	to->inh_flags |= X509_VP_FLAG_DEFAULT;
202	return X509_VERIFY_PARAM_inherit(to, from);
203	}
204
205int X509_VERIFY_PARAM_set1_name(X509_VERIFY_PARAM *param, const char *name)
206	{
207	if (param->name)
208		OPENSSL_free(param->name);
209	param->name = BUF_strdup(name);
210	if (param->name)
211		return 1;
212	return 0;
213	}
214
215int X509_VERIFY_PARAM_set_flags(X509_VERIFY_PARAM *param, unsigned long flags)
216	{
217	param->flags |= flags;
218	if (flags & X509_V_FLAG_POLICY_MASK)
219		param->flags |= X509_V_FLAG_POLICY_CHECK;
220	return 1;
221	}
222
223int X509_VERIFY_PARAM_clear_flags(X509_VERIFY_PARAM *param, unsigned long flags)
224	{
225	param->flags &= ~flags;
226	return 1;
227	}
228
229unsigned long X509_VERIFY_PARAM_get_flags(X509_VERIFY_PARAM *param)
230	{
231	return param->flags;
232	}
233
234int X509_VERIFY_PARAM_set_purpose(X509_VERIFY_PARAM *param, int purpose)
235	{
236	return X509_PURPOSE_set(&param->purpose, purpose);
237	}
238
239int X509_VERIFY_PARAM_set_trust(X509_VERIFY_PARAM *param, int trust)
240	{
241	return X509_TRUST_set(&param->trust, trust);
242	}
243
244void X509_VERIFY_PARAM_set_depth(X509_VERIFY_PARAM *param, int depth)
245	{
246	param->depth = depth;
247	}
248
249void X509_VERIFY_PARAM_set_time(X509_VERIFY_PARAM *param, time_t t)
250	{
251	param->check_time = t;
252	param->flags |= X509_V_FLAG_USE_CHECK_TIME;
253	}
254
255int X509_VERIFY_PARAM_add0_policy(X509_VERIFY_PARAM *param, ASN1_OBJECT *policy)
256	{
257	if (!param->policies)
258		{
259		param->policies = sk_ASN1_OBJECT_new_null();
260		if (!param->policies)
261			return 0;
262		}
263	if (!sk_ASN1_OBJECT_push(param->policies, policy))
264		return 0;
265	return 1;
266	}
267
268int X509_VERIFY_PARAM_set1_policies(X509_VERIFY_PARAM *param,
269					STACK_OF(ASN1_OBJECT) *policies)
270	{
271	int i;
272	ASN1_OBJECT *oid, *doid;
273	if (!param)
274		return 0;
275	if (param->policies)
276		sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
277
278	if (!policies)
279		{
280		param->policies = NULL;
281		return 1;
282		}
283
284	param->policies = sk_ASN1_OBJECT_new_null();
285	if (!param->policies)
286		return 0;
287
288	for (i = 0; i < sk_ASN1_OBJECT_num(policies); i++)
289		{
290		oid = sk_ASN1_OBJECT_value(policies, i);
291		doid = OBJ_dup(oid);
292		if (!doid)
293			return 0;
294		if (!sk_ASN1_OBJECT_push(param->policies, doid))
295			{
296			ASN1_OBJECT_free(doid);
297			return 0;
298			}
299		}
300	param->flags |= X509_V_FLAG_POLICY_CHECK;
301	return 1;
302	}
303
304int X509_VERIFY_PARAM_get_depth(const X509_VERIFY_PARAM *param)
305	{
306	return param->depth;
307	}
308
309/* Default verify parameters: these are used for various
310 * applications and can be overridden by the user specified table.
311 * NB: the 'name' field *must* be in alphabetical order because it
312 * will be searched using OBJ_search.
313 */
314
315static const X509_VERIFY_PARAM default_table[] = {
316	{
317	"default",	/* X509 default parameters */
318	0,		/* Check time */
319	0,		/* internal flags */
320	0,		/* flags */
321	0,		/* purpose */
322	0,		/* trust */
323	9,		/* depth */
324	NULL		/* policies */
325	},
326	{
327	"pkcs7",			/* SSL/TLS client parameters */
328	0,				/* Check time */
329	0,				/* internal flags */
330	0,				/* flags */
331	X509_PURPOSE_SMIME_SIGN,	/* purpose */
332	X509_TRUST_EMAIL,		/* trust */
333	-1,				/* depth */
334	NULL				/* policies */
335	},
336	{
337	"ssl_client",			/* SSL/TLS client parameters */
338	0,				/* Check time */
339	0,				/* internal flags */
340	0,				/* flags */
341	X509_PURPOSE_SSL_CLIENT,	/* purpose */
342	X509_TRUST_SSL_CLIENT,		/* trust */
343	-1,				/* depth */
344	NULL				/* policies */
345	},
346	{
347	"ssl_server",			/* SSL/TLS server parameters */
348	0,				/* Check time */
349	0,				/* internal flags */
350	0,				/* flags */
351	X509_PURPOSE_SSL_SERVER,	/* purpose */
352	X509_TRUST_SSL_SERVER,		/* trust */
353	-1,				/* depth */
354	NULL				/* policies */
355	}};
356
357static STACK_OF(X509_VERIFY_PARAM) *param_table = NULL;
358
359static int table_cmp(const void *pa, const void *pb)
360	{
361	const X509_VERIFY_PARAM *a = pa, *b = pb;
362	return strcmp(a->name, b->name);
363	}
364
365static int param_cmp(const X509_VERIFY_PARAM * const *a,
366			const X509_VERIFY_PARAM * const *b)
367	{
368	return strcmp((*a)->name, (*b)->name);
369	}
370
371int X509_VERIFY_PARAM_add0_table(X509_VERIFY_PARAM *param)
372	{
373	int idx;
374	X509_VERIFY_PARAM *ptmp;
375	if (!param_table)
376		{
377		param_table = sk_X509_VERIFY_PARAM_new(param_cmp);
378		if (!param_table)
379			return 0;
380		}
381	else
382		{
383		idx = sk_X509_VERIFY_PARAM_find(param_table, param);
384		if (idx != -1)
385			{
386			ptmp = sk_X509_VERIFY_PARAM_value(param_table, idx);
387			X509_VERIFY_PARAM_free(ptmp);
388			sk_X509_VERIFY_PARAM_delete(param_table, idx);
389			}
390		}
391	if (!sk_X509_VERIFY_PARAM_push(param_table, param))
392		return 0;
393	return 1;
394	}
395
396const X509_VERIFY_PARAM *X509_VERIFY_PARAM_lookup(const char *name)
397	{
398	int idx;
399	X509_VERIFY_PARAM pm;
400	pm.name = (char *)name;
401	if (param_table)
402		{
403		idx = sk_X509_VERIFY_PARAM_find(param_table, &pm);
404		if (idx != -1)
405			return sk_X509_VERIFY_PARAM_value(param_table, idx);
406		}
407	return (const X509_VERIFY_PARAM *) OBJ_bsearch((char *)&pm,
408				(char *)&default_table,
409				sizeof(default_table)/sizeof(X509_VERIFY_PARAM),
410				sizeof(X509_VERIFY_PARAM),
411				table_cmp);
412	}
413
414void X509_VERIFY_PARAM_table_cleanup(void)
415	{
416	if (param_table)
417		sk_X509_VERIFY_PARAM_pop_free(param_table,
418						X509_VERIFY_PARAM_free);
419	param_table = NULL;
420	}
421