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 | /* extension creation utilities */ |
11 | |
12 | #include <stdio.h> |
13 | #include "crypto/ctype.h" |
14 | #include "internal/cryptlib.h" |
15 | #include <openssl/conf.h> |
16 | #include <openssl/x509.h> |
17 | #include "crypto/x509.h" |
18 | #include <openssl/x509v3.h> |
19 | |
20 | static int v3_check_critical(const char **value); |
21 | static int v3_check_generic(const char **value); |
22 | static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid, |
23 | int crit, const char *value); |
24 | static X509_EXTENSION *v3_generic_extension(const char *ext, const char *value, |
25 | int crit, int type, |
26 | X509V3_CTX *ctx); |
27 | static char *conf_lhash_get_string(void *db, const char *section, const char *value); |
28 | static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, const char *section); |
29 | static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, |
30 | int ext_nid, int crit, void *ext_struc); |
31 | static unsigned char *generic_asn1(const char *value, X509V3_CTX *ctx, |
32 | long *ext_len); |
33 | /* CONF *conf: Config file */ |
34 | /* char *name: Name */ |
35 | /* char *value: Value */ |
36 | X509_EXTENSION *X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, const char *name, |
37 | const char *value) |
38 | { |
39 | int crit; |
40 | int ext_type; |
41 | X509_EXTENSION *ret; |
42 | crit = v3_check_critical(&value); |
43 | if ((ext_type = v3_check_generic(&value))) |
44 | return v3_generic_extension(name, value, crit, ext_type, ctx); |
45 | ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value); |
46 | if (!ret) { |
47 | X509V3err(X509V3_F_X509V3_EXT_NCONF, X509V3_R_ERROR_IN_EXTENSION); |
48 | ERR_add_error_data(4, "name=" , name, ", value=" , value); |
49 | } |
50 | return ret; |
51 | } |
52 | |
53 | /* CONF *conf: Config file */ |
54 | /* char *value: Value */ |
55 | X509_EXTENSION *X509V3_EXT_nconf_nid(CONF *conf, X509V3_CTX *ctx, int ext_nid, |
56 | const char *value) |
57 | { |
58 | int crit; |
59 | int ext_type; |
60 | crit = v3_check_critical(&value); |
61 | if ((ext_type = v3_check_generic(&value))) |
62 | return v3_generic_extension(OBJ_nid2sn(ext_nid), |
63 | value, crit, ext_type, ctx); |
64 | return do_ext_nconf(conf, ctx, ext_nid, crit, value); |
65 | } |
66 | |
67 | /* CONF *conf: Config file */ |
68 | /* char *value: Value */ |
69 | static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid, |
70 | int crit, const char *value) |
71 | { |
72 | const X509V3_EXT_METHOD *method; |
73 | X509_EXTENSION *ext; |
74 | STACK_OF(CONF_VALUE) *nval; |
75 | void *ext_struc; |
76 | |
77 | if (ext_nid == NID_undef) { |
78 | X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_UNKNOWN_EXTENSION_NAME); |
79 | return NULL; |
80 | } |
81 | if ((method = X509V3_EXT_get_nid(ext_nid)) == NULL) { |
82 | X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_UNKNOWN_EXTENSION); |
83 | return NULL; |
84 | } |
85 | /* Now get internal extension representation based on type */ |
86 | if (method->v2i) { |
87 | if (*value == '@') |
88 | nval = NCONF_get_section(conf, value + 1); |
89 | else |
90 | nval = X509V3_parse_list(value); |
91 | if (nval == NULL || sk_CONF_VALUE_num(nval) <= 0) { |
92 | X509V3err(X509V3_F_DO_EXT_NCONF, |
93 | X509V3_R_INVALID_EXTENSION_STRING); |
94 | ERR_add_error_data(4, "name=" , OBJ_nid2sn(ext_nid), ",section=" , |
95 | value); |
96 | if (*value != '@') |
97 | sk_CONF_VALUE_pop_free(nval, X509V3_conf_free); |
98 | return NULL; |
99 | } |
100 | ext_struc = method->v2i(method, ctx, nval); |
101 | if (*value != '@') |
102 | sk_CONF_VALUE_pop_free(nval, X509V3_conf_free); |
103 | if (!ext_struc) |
104 | return NULL; |
105 | } else if (method->s2i) { |
106 | if ((ext_struc = method->s2i(method, ctx, value)) == NULL) |
107 | return NULL; |
108 | } else if (method->r2i) { |
109 | if (!ctx->db || !ctx->db_meth) { |
110 | X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_NO_CONFIG_DATABASE); |
111 | return NULL; |
112 | } |
113 | if ((ext_struc = method->r2i(method, ctx, value)) == NULL) |
114 | return NULL; |
115 | } else { |
116 | X509V3err(X509V3_F_DO_EXT_NCONF, |
117 | X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED); |
118 | ERR_add_error_data(2, "name=" , OBJ_nid2sn(ext_nid)); |
119 | return NULL; |
120 | } |
121 | |
122 | ext = do_ext_i2d(method, ext_nid, crit, ext_struc); |
123 | if (method->it) |
124 | ASN1_item_free(ext_struc, ASN1_ITEM_ptr(method->it)); |
125 | else |
126 | method->ext_free(ext_struc); |
127 | return ext; |
128 | |
129 | } |
130 | |
131 | static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, |
132 | int ext_nid, int crit, void *ext_struc) |
133 | { |
134 | unsigned char *ext_der = NULL; |
135 | int ext_len; |
136 | ASN1_OCTET_STRING *ext_oct = NULL; |
137 | X509_EXTENSION *ext; |
138 | /* Convert internal representation to DER */ |
139 | if (method->it) { |
140 | ext_der = NULL; |
141 | ext_len = |
142 | ASN1_item_i2d(ext_struc, &ext_der, ASN1_ITEM_ptr(method->it)); |
143 | if (ext_len < 0) |
144 | goto merr; |
145 | } else { |
146 | unsigned char *p; |
147 | |
148 | ext_len = method->i2d(ext_struc, NULL); |
149 | if ((ext_der = OPENSSL_malloc(ext_len)) == NULL) |
150 | goto merr; |
151 | p = ext_der; |
152 | method->i2d(ext_struc, &p); |
153 | } |
154 | if ((ext_oct = ASN1_OCTET_STRING_new()) == NULL) |
155 | goto merr; |
156 | ext_oct->data = ext_der; |
157 | ext_der = NULL; |
158 | ext_oct->length = ext_len; |
159 | |
160 | ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct); |
161 | if (!ext) |
162 | goto merr; |
163 | ASN1_OCTET_STRING_free(ext_oct); |
164 | |
165 | return ext; |
166 | |
167 | merr: |
168 | X509V3err(X509V3_F_DO_EXT_I2D, ERR_R_MALLOC_FAILURE); |
169 | OPENSSL_free(ext_der); |
170 | ASN1_OCTET_STRING_free(ext_oct); |
171 | return NULL; |
172 | |
173 | } |
174 | |
175 | /* Given an internal structure, nid and critical flag create an extension */ |
176 | |
177 | X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc) |
178 | { |
179 | const X509V3_EXT_METHOD *method; |
180 | |
181 | if ((method = X509V3_EXT_get_nid(ext_nid)) == NULL) { |
182 | X509V3err(X509V3_F_X509V3_EXT_I2D, X509V3_R_UNKNOWN_EXTENSION); |
183 | return NULL; |
184 | } |
185 | return do_ext_i2d(method, ext_nid, crit, ext_struc); |
186 | } |
187 | |
188 | /* Check the extension string for critical flag */ |
189 | static int v3_check_critical(const char **value) |
190 | { |
191 | const char *p = *value; |
192 | if ((strlen(p) < 9) || strncmp(p, "critical," , 9)) |
193 | return 0; |
194 | p += 9; |
195 | while (ossl_isspace(*p)) |
196 | p++; |
197 | *value = p; |
198 | return 1; |
199 | } |
200 | |
201 | /* Check extension string for generic extension and return the type */ |
202 | static int v3_check_generic(const char **value) |
203 | { |
204 | int gen_type = 0; |
205 | const char *p = *value; |
206 | if ((strlen(p) >= 4) && strncmp(p, "DER:" , 4) == 0) { |
207 | p += 4; |
208 | gen_type = 1; |
209 | } else if ((strlen(p) >= 5) && strncmp(p, "ASN1:" , 5) == 0) { |
210 | p += 5; |
211 | gen_type = 2; |
212 | } else |
213 | return 0; |
214 | |
215 | while (ossl_isspace(*p)) |
216 | p++; |
217 | *value = p; |
218 | return gen_type; |
219 | } |
220 | |
221 | /* Create a generic extension: for now just handle DER type */ |
222 | static X509_EXTENSION *v3_generic_extension(const char *ext, const char *value, |
223 | int crit, int gen_type, |
224 | X509V3_CTX *ctx) |
225 | { |
226 | unsigned char *ext_der = NULL; |
227 | long ext_len = 0; |
228 | ASN1_OBJECT *obj = NULL; |
229 | ASN1_OCTET_STRING *oct = NULL; |
230 | X509_EXTENSION *extension = NULL; |
231 | |
232 | if ((obj = OBJ_txt2obj(ext, 0)) == NULL) { |
233 | X509V3err(X509V3_F_V3_GENERIC_EXTENSION, |
234 | X509V3_R_EXTENSION_NAME_ERROR); |
235 | ERR_add_error_data(2, "name=" , ext); |
236 | goto err; |
237 | } |
238 | |
239 | if (gen_type == 1) |
240 | ext_der = OPENSSL_hexstr2buf(value, &ext_len); |
241 | else if (gen_type == 2) |
242 | ext_der = generic_asn1(value, ctx, &ext_len); |
243 | |
244 | if (ext_der == NULL) { |
245 | X509V3err(X509V3_F_V3_GENERIC_EXTENSION, |
246 | X509V3_R_EXTENSION_VALUE_ERROR); |
247 | ERR_add_error_data(2, "value=" , value); |
248 | goto err; |
249 | } |
250 | |
251 | if ((oct = ASN1_OCTET_STRING_new()) == NULL) { |
252 | X509V3err(X509V3_F_V3_GENERIC_EXTENSION, ERR_R_MALLOC_FAILURE); |
253 | goto err; |
254 | } |
255 | |
256 | oct->data = ext_der; |
257 | oct->length = ext_len; |
258 | ext_der = NULL; |
259 | |
260 | extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct); |
261 | |
262 | err: |
263 | ASN1_OBJECT_free(obj); |
264 | ASN1_OCTET_STRING_free(oct); |
265 | OPENSSL_free(ext_der); |
266 | return extension; |
267 | |
268 | } |
269 | |
270 | static unsigned char *generic_asn1(const char *value, X509V3_CTX *ctx, |
271 | long *ext_len) |
272 | { |
273 | ASN1_TYPE *typ; |
274 | unsigned char *ext_der = NULL; |
275 | typ = ASN1_generate_v3(value, ctx); |
276 | if (typ == NULL) |
277 | return NULL; |
278 | *ext_len = i2d_ASN1_TYPE(typ, &ext_der); |
279 | ASN1_TYPE_free(typ); |
280 | return ext_der; |
281 | } |
282 | |
283 | static void delete_ext(STACK_OF(X509_EXTENSION) *sk, X509_EXTENSION *dext) |
284 | { |
285 | int idx; |
286 | ASN1_OBJECT *obj; |
287 | obj = X509_EXTENSION_get_object(dext); |
288 | while ((idx = X509v3_get_ext_by_OBJ(sk, obj, -1)) >= 0) { |
289 | X509_EXTENSION *tmpext = X509v3_get_ext(sk, idx); |
290 | X509v3_delete_ext(sk, idx); |
291 | X509_EXTENSION_free(tmpext); |
292 | } |
293 | } |
294 | |
295 | /* |
296 | * This is the main function: add a bunch of extensions based on a config |
297 | * file section to an extension STACK. |
298 | */ |
299 | |
300 | int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, const char *section, |
301 | STACK_OF(X509_EXTENSION) **sk) |
302 | { |
303 | X509_EXTENSION *ext; |
304 | STACK_OF(CONF_VALUE) *nval; |
305 | CONF_VALUE *val; |
306 | int i; |
307 | |
308 | if ((nval = NCONF_get_section(conf, section)) == NULL) |
309 | return 0; |
310 | for (i = 0; i < sk_CONF_VALUE_num(nval); i++) { |
311 | val = sk_CONF_VALUE_value(nval, i); |
312 | if ((ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value)) == NULL) |
313 | return 0; |
314 | if (ctx->flags == X509V3_CTX_REPLACE) |
315 | delete_ext(*sk, ext); |
316 | if (sk != NULL) { |
317 | if (X509v3_add_ext(sk, ext, -1) == NULL) { |
318 | X509_EXTENSION_free(ext); |
319 | return 0; |
320 | } |
321 | } |
322 | X509_EXTENSION_free(ext); |
323 | } |
324 | return 1; |
325 | } |
326 | |
327 | /* |
328 | * Convenience functions to add extensions to a certificate, CRL and request |
329 | */ |
330 | |
331 | int X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section, |
332 | X509 *cert) |
333 | { |
334 | STACK_OF(X509_EXTENSION) **sk = NULL; |
335 | if (cert) |
336 | sk = &cert->cert_info.extensions; |
337 | return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); |
338 | } |
339 | |
340 | /* Same as above but for a CRL */ |
341 | |
342 | int X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section, |
343 | X509_CRL *crl) |
344 | { |
345 | STACK_OF(X509_EXTENSION) **sk = NULL; |
346 | if (crl) |
347 | sk = &crl->crl.extensions; |
348 | return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); |
349 | } |
350 | |
351 | /* Add extensions to certificate request */ |
352 | |
353 | int X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section, |
354 | X509_REQ *req) |
355 | { |
356 | STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL; |
357 | int i; |
358 | if (req) |
359 | sk = &extlist; |
360 | i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); |
361 | if (!i || !sk) |
362 | return i; |
363 | i = X509_REQ_add_extensions(req, extlist); |
364 | sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free); |
365 | return i; |
366 | } |
367 | |
368 | /* Config database functions */ |
369 | |
370 | char *X509V3_get_string(X509V3_CTX *ctx, const char *name, const char *section) |
371 | { |
372 | if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string) { |
373 | X509V3err(X509V3_F_X509V3_GET_STRING, X509V3_R_OPERATION_NOT_DEFINED); |
374 | return NULL; |
375 | } |
376 | if (ctx->db_meth->get_string) |
377 | return ctx->db_meth->get_string(ctx->db, name, section); |
378 | return NULL; |
379 | } |
380 | |
381 | STACK_OF(CONF_VALUE) *X509V3_get_section(X509V3_CTX *ctx, const char *section) |
382 | { |
383 | if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section) { |
384 | X509V3err(X509V3_F_X509V3_GET_SECTION, |
385 | X509V3_R_OPERATION_NOT_DEFINED); |
386 | return NULL; |
387 | } |
388 | if (ctx->db_meth->get_section) |
389 | return ctx->db_meth->get_section(ctx->db, section); |
390 | return NULL; |
391 | } |
392 | |
393 | void X509V3_string_free(X509V3_CTX *ctx, char *str) |
394 | { |
395 | if (!str) |
396 | return; |
397 | if (ctx->db_meth->free_string) |
398 | ctx->db_meth->free_string(ctx->db, str); |
399 | } |
400 | |
401 | void X509V3_section_free(X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *section) |
402 | { |
403 | if (!section) |
404 | return; |
405 | if (ctx->db_meth->free_section) |
406 | ctx->db_meth->free_section(ctx->db, section); |
407 | } |
408 | |
409 | static char *nconf_get_string(void *db, const char *section, const char *value) |
410 | { |
411 | return NCONF_get_string(db, section, value); |
412 | } |
413 | |
414 | static STACK_OF(CONF_VALUE) *nconf_get_section(void *db, const char *section) |
415 | { |
416 | return NCONF_get_section(db, section); |
417 | } |
418 | |
419 | static X509V3_CONF_METHOD nconf_method = { |
420 | nconf_get_string, |
421 | nconf_get_section, |
422 | NULL, |
423 | NULL |
424 | }; |
425 | |
426 | void X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf) |
427 | { |
428 | ctx->db_meth = &nconf_method; |
429 | ctx->db = conf; |
430 | } |
431 | |
432 | void X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req, |
433 | X509_CRL *crl, int flags) |
434 | { |
435 | ctx->issuer_cert = issuer; |
436 | ctx->subject_cert = subj; |
437 | ctx->crl = crl; |
438 | ctx->subject_req = req; |
439 | ctx->flags = flags; |
440 | } |
441 | |
442 | /* Old conf compatibility functions */ |
443 | |
444 | X509_EXTENSION *X509V3_EXT_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx, |
445 | const char *name, const char *value) |
446 | { |
447 | CONF ctmp; |
448 | CONF_set_nconf(&ctmp, conf); |
449 | return X509V3_EXT_nconf(&ctmp, ctx, name, value); |
450 | } |
451 | |
452 | /* LHASH *conf: Config file */ |
453 | /* char *value: Value */ |
454 | X509_EXTENSION *X509V3_EXT_conf_nid(LHASH_OF(CONF_VALUE) *conf, |
455 | X509V3_CTX *ctx, int ext_nid, const char *value) |
456 | { |
457 | CONF ctmp; |
458 | CONF_set_nconf(&ctmp, conf); |
459 | return X509V3_EXT_nconf_nid(&ctmp, ctx, ext_nid, value); |
460 | } |
461 | |
462 | static char *conf_lhash_get_string(void *db, const char *section, const char *value) |
463 | { |
464 | return CONF_get_string(db, section, value); |
465 | } |
466 | |
467 | static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, const char *section) |
468 | { |
469 | return CONF_get_section(db, section); |
470 | } |
471 | |
472 | static X509V3_CONF_METHOD conf_lhash_method = { |
473 | conf_lhash_get_string, |
474 | conf_lhash_get_section, |
475 | NULL, |
476 | NULL |
477 | }; |
478 | |
479 | void X509V3_set_conf_lhash(X509V3_CTX *ctx, LHASH_OF(CONF_VALUE) *lhash) |
480 | { |
481 | ctx->db_meth = &conf_lhash_method; |
482 | ctx->db = lhash; |
483 | } |
484 | |
485 | int X509V3_EXT_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx, |
486 | const char *section, X509 *cert) |
487 | { |
488 | CONF ctmp; |
489 | CONF_set_nconf(&ctmp, conf); |
490 | return X509V3_EXT_add_nconf(&ctmp, ctx, section, cert); |
491 | } |
492 | |
493 | /* Same as above but for a CRL */ |
494 | |
495 | int X509V3_EXT_CRL_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx, |
496 | const char *section, X509_CRL *crl) |
497 | { |
498 | CONF ctmp; |
499 | CONF_set_nconf(&ctmp, conf); |
500 | return X509V3_EXT_CRL_add_nconf(&ctmp, ctx, section, crl); |
501 | } |
502 | |
503 | /* Add extensions to certificate request */ |
504 | |
505 | int X509V3_EXT_REQ_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx, |
506 | const char *section, X509_REQ *req) |
507 | { |
508 | CONF ctmp; |
509 | CONF_set_nconf(&ctmp, conf); |
510 | return X509V3_EXT_REQ_add_nconf(&ctmp, ctx, section, req); |
511 | } |
512 | |