1 | /* |
2 | * Copyright 1999-2018 The OpenSSL Project Authors. All Rights Reserved. |
3 | * |
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 |
8 | */ |
9 | |
10 | /* X509 v3 extension utilities */ |
11 | |
12 | #include <stdio.h> |
13 | #include "internal/cryptlib.h" |
14 | #include <openssl/conf.h> |
15 | #include <openssl/x509v3.h> |
16 | |
17 | #include "ext_dat.h" |
18 | |
19 | static STACK_OF(X509V3_EXT_METHOD) *ext_list = NULL; |
20 | |
21 | static int ext_cmp(const X509V3_EXT_METHOD *const *a, |
22 | const X509V3_EXT_METHOD *const *b); |
23 | static void ext_list_free(X509V3_EXT_METHOD *ext); |
24 | |
25 | int X509V3_EXT_add(X509V3_EXT_METHOD *ext) |
26 | { |
27 | if (ext_list == NULL |
28 | && (ext_list = sk_X509V3_EXT_METHOD_new(ext_cmp)) == NULL) { |
29 | X509V3err(X509V3_F_X509V3_EXT_ADD, ERR_R_MALLOC_FAILURE); |
30 | return 0; |
31 | } |
32 | if (!sk_X509V3_EXT_METHOD_push(ext_list, ext)) { |
33 | X509V3err(X509V3_F_X509V3_EXT_ADD, ERR_R_MALLOC_FAILURE); |
34 | return 0; |
35 | } |
36 | return 1; |
37 | } |
38 | |
39 | static int ext_cmp(const X509V3_EXT_METHOD *const *a, |
40 | const X509V3_EXT_METHOD *const *b) |
41 | { |
42 | return ((*a)->ext_nid - (*b)->ext_nid); |
43 | } |
44 | |
45 | DECLARE_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *, |
46 | const X509V3_EXT_METHOD *, ext); |
47 | IMPLEMENT_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *, |
48 | const X509V3_EXT_METHOD *, ext); |
49 | |
50 | #include "standard_exts.h" |
51 | |
52 | const X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid) |
53 | { |
54 | X509V3_EXT_METHOD tmp; |
55 | const X509V3_EXT_METHOD *t = &tmp, *const *ret; |
56 | int idx; |
57 | |
58 | if (nid < 0) |
59 | return NULL; |
60 | tmp.ext_nid = nid; |
61 | ret = OBJ_bsearch_ext(&t, standard_exts, STANDARD_EXTENSION_COUNT); |
62 | if (ret) |
63 | return *ret; |
64 | if (!ext_list) |
65 | return NULL; |
66 | idx = sk_X509V3_EXT_METHOD_find(ext_list, &tmp); |
67 | return sk_X509V3_EXT_METHOD_value(ext_list, idx); |
68 | } |
69 | |
70 | const X509V3_EXT_METHOD *X509V3_EXT_get(X509_EXTENSION *ext) |
71 | { |
72 | int nid; |
73 | if ((nid = OBJ_obj2nid(X509_EXTENSION_get_object(ext))) == NID_undef) |
74 | return NULL; |
75 | return X509V3_EXT_get_nid(nid); |
76 | } |
77 | |
78 | int X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist) |
79 | { |
80 | for (; extlist->ext_nid != -1; extlist++) |
81 | if (!X509V3_EXT_add(extlist)) |
82 | return 0; |
83 | return 1; |
84 | } |
85 | |
86 | int X509V3_EXT_add_alias(int nid_to, int nid_from) |
87 | { |
88 | const X509V3_EXT_METHOD *ext; |
89 | X509V3_EXT_METHOD *tmpext; |
90 | |
91 | if ((ext = X509V3_EXT_get_nid(nid_from)) == NULL) { |
92 | X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS, X509V3_R_EXTENSION_NOT_FOUND); |
93 | return 0; |
94 | } |
95 | if ((tmpext = OPENSSL_malloc(sizeof(*tmpext))) == NULL) { |
96 | X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS, ERR_R_MALLOC_FAILURE); |
97 | return 0; |
98 | } |
99 | *tmpext = *ext; |
100 | tmpext->ext_nid = nid_to; |
101 | tmpext->ext_flags |= X509V3_EXT_DYNAMIC; |
102 | return X509V3_EXT_add(tmpext); |
103 | } |
104 | |
105 | void X509V3_EXT_cleanup(void) |
106 | { |
107 | sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free); |
108 | ext_list = NULL; |
109 | } |
110 | |
111 | static void ext_list_free(X509V3_EXT_METHOD *ext) |
112 | { |
113 | if (ext->ext_flags & X509V3_EXT_DYNAMIC) |
114 | OPENSSL_free(ext); |
115 | } |
116 | |
117 | /* |
118 | * Legacy function: we don't need to add standard extensions any more because |
119 | * they are now kept in ext_dat.h. |
120 | */ |
121 | |
122 | int X509V3_add_standard_extensions(void) |
123 | { |
124 | return 1; |
125 | } |
126 | |
127 | /* Return an extension internal structure */ |
128 | |
129 | void *X509V3_EXT_d2i(X509_EXTENSION *ext) |
130 | { |
131 | const X509V3_EXT_METHOD *method; |
132 | const unsigned char *p; |
133 | ASN1_STRING *extvalue; |
134 | int extlen; |
135 | |
136 | if ((method = X509V3_EXT_get(ext)) == NULL) |
137 | return NULL; |
138 | extvalue = X509_EXTENSION_get_data(ext); |
139 | p = ASN1_STRING_get0_data(extvalue); |
140 | extlen = ASN1_STRING_length(extvalue); |
141 | if (method->it) |
142 | return ASN1_item_d2i(NULL, &p, extlen, ASN1_ITEM_ptr(method->it)); |
143 | return method->d2i(NULL, &p, extlen); |
144 | } |
145 | |
146 | /*- |
147 | * Get critical flag and decoded version of extension from a NID. |
148 | * The "idx" variable returns the last found extension and can |
149 | * be used to retrieve multiple extensions of the same NID. |
150 | * However multiple extensions with the same NID is usually |
151 | * due to a badly encoded certificate so if idx is NULL we |
152 | * choke if multiple extensions exist. |
153 | * The "crit" variable is set to the critical value. |
154 | * The return value is the decoded extension or NULL on |
155 | * error. The actual error can have several different causes, |
156 | * the value of *crit reflects the cause: |
157 | * >= 0, extension found but not decoded (reflects critical value). |
158 | * -1 extension not found. |
159 | * -2 extension occurs more than once. |
160 | */ |
161 | |
162 | void *X509V3_get_d2i(const STACK_OF(X509_EXTENSION) *x, int nid, int *crit, |
163 | int *idx) |
164 | { |
165 | int lastpos, i; |
166 | X509_EXTENSION *ex, *found_ex = NULL; |
167 | |
168 | if (!x) { |
169 | if (idx) |
170 | *idx = -1; |
171 | if (crit) |
172 | *crit = -1; |
173 | return NULL; |
174 | } |
175 | if (idx) |
176 | lastpos = *idx + 1; |
177 | else |
178 | lastpos = 0; |
179 | if (lastpos < 0) |
180 | lastpos = 0; |
181 | for (i = lastpos; i < sk_X509_EXTENSION_num(x); i++) { |
182 | ex = sk_X509_EXTENSION_value(x, i); |
183 | if (OBJ_obj2nid(X509_EXTENSION_get_object(ex)) == nid) { |
184 | if (idx) { |
185 | *idx = i; |
186 | found_ex = ex; |
187 | break; |
188 | } else if (found_ex) { |
189 | /* Found more than one */ |
190 | if (crit) |
191 | *crit = -2; |
192 | return NULL; |
193 | } |
194 | found_ex = ex; |
195 | } |
196 | } |
197 | if (found_ex) { |
198 | /* Found it */ |
199 | if (crit) |
200 | *crit = X509_EXTENSION_get_critical(found_ex); |
201 | return X509V3_EXT_d2i(found_ex); |
202 | } |
203 | |
204 | /* Extension not found */ |
205 | if (idx) |
206 | *idx = -1; |
207 | if (crit) |
208 | *crit = -1; |
209 | return NULL; |
210 | } |
211 | |
212 | /* |
213 | * This function is a general extension append, replace and delete utility. |
214 | * The precise operation is governed by the 'flags' value. The 'crit' and |
215 | * 'value' arguments (if relevant) are the extensions internal structure. |
216 | */ |
217 | |
218 | int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value, |
219 | int crit, unsigned long flags) |
220 | { |
221 | int errcode, extidx = -1; |
222 | X509_EXTENSION *ext = NULL, *extmp; |
223 | STACK_OF(X509_EXTENSION) *ret = NULL; |
224 | unsigned long ext_op = flags & X509V3_ADD_OP_MASK; |
225 | |
226 | /* |
227 | * If appending we don't care if it exists, otherwise look for existing |
228 | * extension. |
229 | */ |
230 | if (ext_op != X509V3_ADD_APPEND) |
231 | extidx = X509v3_get_ext_by_NID(*x, nid, -1); |
232 | |
233 | /* See if extension exists */ |
234 | if (extidx >= 0) { |
235 | /* If keep existing, nothing to do */ |
236 | if (ext_op == X509V3_ADD_KEEP_EXISTING) |
237 | return 1; |
238 | /* If default then its an error */ |
239 | if (ext_op == X509V3_ADD_DEFAULT) { |
240 | errcode = X509V3_R_EXTENSION_EXISTS; |
241 | goto err; |
242 | } |
243 | /* If delete, just delete it */ |
244 | if (ext_op == X509V3_ADD_DELETE) { |
245 | if (!sk_X509_EXTENSION_delete(*x, extidx)) |
246 | return -1; |
247 | return 1; |
248 | } |
249 | } else { |
250 | /* |
251 | * If replace existing or delete, error since extension must exist |
252 | */ |
253 | if ((ext_op == X509V3_ADD_REPLACE_EXISTING) || |
254 | (ext_op == X509V3_ADD_DELETE)) { |
255 | errcode = X509V3_R_EXTENSION_NOT_FOUND; |
256 | goto err; |
257 | } |
258 | } |
259 | |
260 | /* |
261 | * If we get this far then we have to create an extension: could have |
262 | * some flags for alternative encoding schemes... |
263 | */ |
264 | |
265 | ext = X509V3_EXT_i2d(nid, crit, value); |
266 | |
267 | if (!ext) { |
268 | X509V3err(X509V3_F_X509V3_ADD1_I2D, |
269 | X509V3_R_ERROR_CREATING_EXTENSION); |
270 | return 0; |
271 | } |
272 | |
273 | /* If extension exists replace it.. */ |
274 | if (extidx >= 0) { |
275 | extmp = sk_X509_EXTENSION_value(*x, extidx); |
276 | X509_EXTENSION_free(extmp); |
277 | if (!sk_X509_EXTENSION_set(*x, extidx, ext)) |
278 | return -1; |
279 | return 1; |
280 | } |
281 | |
282 | ret = *x; |
283 | if (*x == NULL |
284 | && (ret = sk_X509_EXTENSION_new_null()) == NULL) |
285 | goto m_fail; |
286 | if (!sk_X509_EXTENSION_push(ret, ext)) |
287 | goto m_fail; |
288 | |
289 | *x = ret; |
290 | return 1; |
291 | |
292 | m_fail: |
293 | /* X509V3err(X509V3_F_X509V3_ADD1_I2D, ERR_R_MALLOC_FAILURE); */ |
294 | if (ret != *x) |
295 | sk_X509_EXTENSION_free(ret); |
296 | X509_EXTENSION_free(ext); |
297 | return -1; |
298 | |
299 | err: |
300 | if (!(flags & X509V3_ADD_SILENT)) |
301 | X509V3err(X509V3_F_X509V3_ADD1_I2D, errcode); |
302 | return 0; |
303 | } |
304 | |