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1 /* v3_lib.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3  * project 1999.
4  */
5 /* ====================================================================
6  * Copyright (c) 1999 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 /* X509 v3 extension utilities */
59 
60 #include <stdio.h>
61 #include "cryptlib.h"
62 #include <openssl/conf.h>
63 #include <openssl/x509v3.h>
64 
65 #include "ext_dat.h"
66 
67 static STACK_OF(X509V3_EXT_METHOD) *ext_list = NULL;
68 
69 static int ext_cmp(const X509V3_EXT_METHOD * const *a,
70 		const X509V3_EXT_METHOD * const *b);
71 static void ext_list_free(X509V3_EXT_METHOD *ext);
72 
X509V3_EXT_add(X509V3_EXT_METHOD * ext)73 int X509V3_EXT_add(X509V3_EXT_METHOD *ext)
74 {
75 	if(!ext_list && !(ext_list = sk_X509V3_EXT_METHOD_new(ext_cmp))) {
76 		X509V3err(X509V3_F_X509V3_EXT_ADD,ERR_R_MALLOC_FAILURE);
77 		return 0;
78 	}
79 	if(!sk_X509V3_EXT_METHOD_push(ext_list, ext)) {
80 		X509V3err(X509V3_F_X509V3_EXT_ADD,ERR_R_MALLOC_FAILURE);
81 		return 0;
82 	}
83 	return 1;
84 }
85 
ext_cmp(const X509V3_EXT_METHOD * const * a,const X509V3_EXT_METHOD * const * b)86 static int ext_cmp(const X509V3_EXT_METHOD * const *a,
87 		   const X509V3_EXT_METHOD * const *b)
88 {
89 	return ((*a)->ext_nid - (*b)->ext_nid);
90 }
91 
92 DECLARE_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *, const X509V3_EXT_METHOD *,
93 			   ext);
94 IMPLEMENT_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *,
95 			     const X509V3_EXT_METHOD *, ext);
96 
X509V3_EXT_get_nid(int nid)97 const X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid)
98 {
99 	X509V3_EXT_METHOD tmp;
100 	const X509V3_EXT_METHOD *t = &tmp, * const *ret;
101 	int idx;
102 	if(nid < 0) return NULL;
103 	tmp.ext_nid = nid;
104 	ret = OBJ_bsearch_ext(&t, standard_exts, STANDARD_EXTENSION_COUNT);
105 	if(ret) return *ret;
106 	if(!ext_list) return NULL;
107 	idx = sk_X509V3_EXT_METHOD_find(ext_list, &tmp);
108 	if(idx == -1) return NULL;
109 	return sk_X509V3_EXT_METHOD_value(ext_list, idx);
110 }
111 
X509V3_EXT_get(X509_EXTENSION * ext)112 const X509V3_EXT_METHOD *X509V3_EXT_get(X509_EXTENSION *ext)
113 {
114 	int nid;
115 	if((nid = OBJ_obj2nid(ext->object)) == NID_undef) return NULL;
116 	return X509V3_EXT_get_nid(nid);
117 }
118 
119 
X509V3_EXT_add_list(X509V3_EXT_METHOD * extlist)120 int X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist)
121 {
122 	for(;extlist->ext_nid!=-1;extlist++)
123 			if(!X509V3_EXT_add(extlist)) return 0;
124 	return 1;
125 }
126 
X509V3_EXT_add_alias(int nid_to,int nid_from)127 int X509V3_EXT_add_alias(int nid_to, int nid_from)
128 {
129 	const X509V3_EXT_METHOD *ext;
130 	X509V3_EXT_METHOD *tmpext;
131 
132 	if(!(ext = X509V3_EXT_get_nid(nid_from))) {
133 		X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,X509V3_R_EXTENSION_NOT_FOUND);
134 		return 0;
135 	}
136 	if(!(tmpext = (X509V3_EXT_METHOD *)OPENSSL_malloc(sizeof(X509V3_EXT_METHOD)))) {
137 		X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,ERR_R_MALLOC_FAILURE);
138 		return 0;
139 	}
140 	*tmpext = *ext;
141 	tmpext->ext_nid = nid_to;
142 	tmpext->ext_flags |= X509V3_EXT_DYNAMIC;
143 	return X509V3_EXT_add(tmpext);
144 }
145 
X509V3_EXT_cleanup(void)146 void X509V3_EXT_cleanup(void)
147 {
148 	sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free);
149 	ext_list = NULL;
150 }
151 
ext_list_free(X509V3_EXT_METHOD * ext)152 static void ext_list_free(X509V3_EXT_METHOD *ext)
153 {
154 	if(ext->ext_flags & X509V3_EXT_DYNAMIC) OPENSSL_free(ext);
155 }
156 
157 /* Legacy function: we don't need to add standard extensions
158  * any more because they are now kept in ext_dat.h.
159  */
160 
X509V3_add_standard_extensions(void)161 int X509V3_add_standard_extensions(void)
162 {
163 	return 1;
164 }
165 
166 /* Return an extension internal structure */
167 
X509V3_EXT_d2i(X509_EXTENSION * ext)168 void *X509V3_EXT_d2i(X509_EXTENSION *ext)
169 {
170 	const X509V3_EXT_METHOD *method;
171 	const unsigned char *p;
172 
173 	if(!(method = X509V3_EXT_get(ext))) return NULL;
174 	p = ext->value->data;
175 	if(method->it) return ASN1_item_d2i(NULL, &p, ext->value->length, ASN1_ITEM_ptr(method->it));
176 	return method->d2i(NULL, &p, ext->value->length);
177 }
178 
179 /* Get critical flag and decoded version of extension from a NID.
180  * The "idx" variable returns the last found extension and can
181  * be used to retrieve multiple extensions of the same NID.
182  * However multiple extensions with the same NID is usually
183  * due to a badly encoded certificate so if idx is NULL we
184  * choke if multiple extensions exist.
185  * The "crit" variable is set to the critical value.
186  * The return value is the decoded extension or NULL on
187  * error. The actual error can have several different causes,
188  * the value of *crit reflects the cause:
189  * >= 0, extension found but not decoded (reflects critical value).
190  * -1 extension not found.
191  * -2 extension occurs more than once.
192  */
193 
X509V3_get_d2i(STACK_OF (X509_EXTENSION)* x,int nid,int * crit,int * idx)194 void *X509V3_get_d2i(STACK_OF(X509_EXTENSION) *x, int nid, int *crit, int *idx)
195 {
196 	int lastpos, i;
197 	X509_EXTENSION *ex, *found_ex = NULL;
198 	if(!x) {
199 		if(idx) *idx = -1;
200 		if(crit) *crit = -1;
201 		return NULL;
202 	}
203 	if(idx) lastpos = *idx + 1;
204 	else lastpos = 0;
205 	if(lastpos < 0) lastpos = 0;
206 	for(i = lastpos; i < sk_X509_EXTENSION_num(x); i++)
207 	{
208 		ex = sk_X509_EXTENSION_value(x, i);
209 		if(OBJ_obj2nid(ex->object) == nid) {
210 			if(idx) {
211 				*idx = i;
212 				found_ex = ex;
213 				break;
214 			} else if(found_ex) {
215 				/* Found more than one */
216 				if(crit) *crit = -2;
217 				return NULL;
218 			}
219 			found_ex = ex;
220 		}
221 	}
222 	if(found_ex) {
223 		/* Found it */
224 		if(crit) *crit = X509_EXTENSION_get_critical(found_ex);
225 		return X509V3_EXT_d2i(found_ex);
226 	}
227 
228 	/* Extension not found */
229 	if(idx) *idx = -1;
230 	if(crit) *crit = -1;
231 	return NULL;
232 }
233 
234 /* This function is a general extension append, replace and delete utility.
235  * The precise operation is governed by the 'flags' value. The 'crit' and
236  * 'value' arguments (if relevant) are the extensions internal structure.
237  */
238 
X509V3_add1_i2d(STACK_OF (X509_EXTENSION)** x,int nid,void * value,int crit,unsigned long flags)239 int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value,
240 					int crit, unsigned long flags)
241 {
242 	int extidx = -1;
243 	int errcode;
244 	X509_EXTENSION *ext, *extmp;
245 	unsigned long ext_op = flags & X509V3_ADD_OP_MASK;
246 
247 	/* If appending we don't care if it exists, otherwise
248 	 * look for existing extension.
249 	 */
250 	if(ext_op != X509V3_ADD_APPEND)
251 		extidx = X509v3_get_ext_by_NID(*x, nid, -1);
252 
253 	/* See if extension exists */
254 	if(extidx >= 0) {
255 		/* If keep existing, nothing to do */
256 		if(ext_op == X509V3_ADD_KEEP_EXISTING)
257 			return 1;
258 		/* If default then its an error */
259 		if(ext_op == X509V3_ADD_DEFAULT) {
260 			errcode = X509V3_R_EXTENSION_EXISTS;
261 			goto err;
262 		}
263 		/* If delete, just delete it */
264 		if(ext_op == X509V3_ADD_DELETE) {
265 			if(!sk_X509_EXTENSION_delete(*x, extidx)) return -1;
266 			return 1;
267 		}
268 	} else {
269 		/* If replace existing or delete, error since
270 		 * extension must exist
271 		 */
272 		if((ext_op == X509V3_ADD_REPLACE_EXISTING) ||
273 		   (ext_op == X509V3_ADD_DELETE)) {
274 			errcode = X509V3_R_EXTENSION_NOT_FOUND;
275 			goto err;
276 		}
277 	}
278 
279 	/* If we get this far then we have to create an extension:
280 	 * could have some flags for alternative encoding schemes...
281 	 */
282 
283 	ext = X509V3_EXT_i2d(nid, crit, value);
284 
285 	if(!ext) {
286 		X509V3err(X509V3_F_X509V3_ADD1_I2D, X509V3_R_ERROR_CREATING_EXTENSION);
287 		return 0;
288 	}
289 
290 	/* If extension exists replace it.. */
291 	if(extidx >= 0) {
292 		extmp = sk_X509_EXTENSION_value(*x, extidx);
293 		X509_EXTENSION_free(extmp);
294 		if(!sk_X509_EXTENSION_set(*x, extidx, ext)) return -1;
295 		return 1;
296 	}
297 
298 	if(!*x && !(*x = sk_X509_EXTENSION_new_null())) return -1;
299 	if(!sk_X509_EXTENSION_push(*x, ext)) return -1;
300 
301 	return 1;
302 
303 	err:
304 	if(!(flags & X509V3_ADD_SILENT))
305 		X509V3err(X509V3_F_X509V3_ADD1_I2D, errcode);
306 	return 0;
307 }
308 
309 IMPLEMENT_STACK_OF(X509V3_EXT_METHOD)
310