2 * Copyright 1999-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 /* X509 v3 extension utilities */
13 #include "internal/cryptlib.h"
14 #include <openssl/conf.h>
15 #include <openssl/x509v3.h>
19 DEFINE_STACK_OF(X509V3_EXT_METHOD)
20 DEFINE_STACK_OF(X509_EXTENSION)
22 static STACK_OF(X509V3_EXT_METHOD) *ext_list = NULL;
24 static int ext_cmp(const X509V3_EXT_METHOD *const *a,
25 const X509V3_EXT_METHOD *const *b);
26 static void ext_list_free(X509V3_EXT_METHOD *ext);
28 int X509V3_EXT_add(X509V3_EXT_METHOD *ext)
31 && (ext_list = sk_X509V3_EXT_METHOD_new(ext_cmp)) == NULL) {
32 X509V3err(X509V3_F_X509V3_EXT_ADD, ERR_R_MALLOC_FAILURE);
35 if (!sk_X509V3_EXT_METHOD_push(ext_list, ext)) {
36 X509V3err(X509V3_F_X509V3_EXT_ADD, ERR_R_MALLOC_FAILURE);
42 static int ext_cmp(const X509V3_EXT_METHOD *const *a,
43 const X509V3_EXT_METHOD *const *b)
45 return ((*a)->ext_nid - (*b)->ext_nid);
48 DECLARE_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *,
49 const X509V3_EXT_METHOD *, ext);
50 IMPLEMENT_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *,
51 const X509V3_EXT_METHOD *, ext);
53 #include "standard_exts.h"
55 const X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid)
57 X509V3_EXT_METHOD tmp;
58 const X509V3_EXT_METHOD *t = &tmp, *const *ret;
64 ret = OBJ_bsearch_ext(&t, standard_exts, STANDARD_EXTENSION_COUNT);
69 idx = sk_X509V3_EXT_METHOD_find(ext_list, &tmp);
70 return sk_X509V3_EXT_METHOD_value(ext_list, idx);
73 const X509V3_EXT_METHOD *X509V3_EXT_get(X509_EXTENSION *ext)
76 if ((nid = OBJ_obj2nid(X509_EXTENSION_get_object(ext))) == NID_undef)
78 return X509V3_EXT_get_nid(nid);
81 int X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist)
83 for (; extlist->ext_nid != -1; extlist++)
84 if (!X509V3_EXT_add(extlist))
89 int X509V3_EXT_add_alias(int nid_to, int nid_from)
91 const X509V3_EXT_METHOD *ext;
92 X509V3_EXT_METHOD *tmpext;
94 if ((ext = X509V3_EXT_get_nid(nid_from)) == NULL) {
95 X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS, X509V3_R_EXTENSION_NOT_FOUND);
98 if ((tmpext = OPENSSL_malloc(sizeof(*tmpext))) == NULL) {
99 X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS, ERR_R_MALLOC_FAILURE);
103 tmpext->ext_nid = nid_to;
104 tmpext->ext_flags |= X509V3_EXT_DYNAMIC;
105 return X509V3_EXT_add(tmpext);
108 void X509V3_EXT_cleanup(void)
110 sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free);
114 static void ext_list_free(X509V3_EXT_METHOD *ext)
116 if (ext->ext_flags & X509V3_EXT_DYNAMIC)
121 * Legacy function: we don't need to add standard extensions any more because
122 * they are now kept in ext_dat.h.
125 int X509V3_add_standard_extensions(void)
130 /* Return an extension internal structure */
132 void *X509V3_EXT_d2i(X509_EXTENSION *ext)
134 const X509V3_EXT_METHOD *method;
135 const unsigned char *p;
136 ASN1_STRING *extvalue;
139 if ((method = X509V3_EXT_get(ext)) == NULL)
141 extvalue = X509_EXTENSION_get_data(ext);
142 p = ASN1_STRING_get0_data(extvalue);
143 extlen = ASN1_STRING_length(extvalue);
145 return ASN1_item_d2i(NULL, &p, extlen, ASN1_ITEM_ptr(method->it));
146 return method->d2i(NULL, &p, extlen);
150 * Get critical flag and decoded version of extension from a NID.
151 * The "idx" variable returns the last found extension and can
152 * be used to retrieve multiple extensions of the same NID.
153 * However multiple extensions with the same NID is usually
154 * due to a badly encoded certificate so if idx is NULL we
155 * choke if multiple extensions exist.
156 * The "crit" variable is set to the critical value.
157 * The return value is the decoded extension or NULL on
158 * error. The actual error can have several different causes,
159 * the value of *crit reflects the cause:
160 * >= 0, extension found but not decoded (reflects critical value).
161 * -1 extension not found.
162 * -2 extension occurs more than once.
165 void *X509V3_get_d2i(const STACK_OF(X509_EXTENSION) *x, int nid, int *crit,
169 X509_EXTENSION *ex, *found_ex = NULL;
184 for (i = lastpos; i < sk_X509_EXTENSION_num(x); i++) {
185 ex = sk_X509_EXTENSION_value(x, i);
186 if (OBJ_obj2nid(X509_EXTENSION_get_object(ex)) == nid) {
191 } else if (found_ex) {
192 /* Found more than one */
203 *crit = X509_EXTENSION_get_critical(found_ex);
204 return X509V3_EXT_d2i(found_ex);
207 /* Extension not found */
216 * This function is a general extension append, replace and delete utility.
217 * The precise operation is governed by the 'flags' value. The 'crit' and
218 * 'value' arguments (if relevant) are the extensions internal structure.
221 int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value,
222 int crit, unsigned long flags)
224 int errcode, extidx = -1;
225 X509_EXTENSION *ext = NULL, *extmp;
226 STACK_OF(X509_EXTENSION) *ret = NULL;
227 unsigned long ext_op = flags & X509V3_ADD_OP_MASK;
230 * If appending we don't care if it exists, otherwise look for existing
233 if (ext_op != X509V3_ADD_APPEND)
234 extidx = X509v3_get_ext_by_NID(*x, nid, -1);
236 /* See if extension exists */
238 /* If keep existing, nothing to do */
239 if (ext_op == X509V3_ADD_KEEP_EXISTING)
241 /* If default then its an error */
242 if (ext_op == X509V3_ADD_DEFAULT) {
243 errcode = X509V3_R_EXTENSION_EXISTS;
246 /* If delete, just delete it */
247 if (ext_op == X509V3_ADD_DELETE) {
248 if (!sk_X509_EXTENSION_delete(*x, extidx))
254 * If replace existing or delete, error since extension must exist
256 if ((ext_op == X509V3_ADD_REPLACE_EXISTING) ||
257 (ext_op == X509V3_ADD_DELETE)) {
258 errcode = X509V3_R_EXTENSION_NOT_FOUND;
264 * If we get this far then we have to create an extension: could have
265 * some flags for alternative encoding schemes...
268 ext = X509V3_EXT_i2d(nid, crit, value);
271 X509V3err(X509V3_F_X509V3_ADD1_I2D,
272 X509V3_R_ERROR_CREATING_EXTENSION);
276 /* If extension exists replace it.. */
278 extmp = sk_X509_EXTENSION_value(*x, extidx);
279 X509_EXTENSION_free(extmp);
280 if (!sk_X509_EXTENSION_set(*x, extidx, ext))
287 && (ret = sk_X509_EXTENSION_new_null()) == NULL)
289 if (!sk_X509_EXTENSION_push(ret, ext))
296 /* X509V3err(X509V3_F_X509V3_ADD1_I2D, ERR_R_MALLOC_FAILURE); */
298 sk_X509_EXTENSION_free(ret);
299 X509_EXTENSION_free(ext);
303 if (!(flags & X509V3_ADD_SILENT))
304 X509V3err(X509V3_F_X509V3_ADD1_I2D, errcode);