1 /* v3_conf.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 1999.
4 */
5 /* ====================================================================
6 * Copyright (c) 1999-2002 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 /* extension creation utilities */
59
60
61
62 #include <stdio.h>
63 #include <ctype.h>
64 #include "cryptlib.h"
65 #include <openssl/conf.h>
66 #include <openssl/x509.h>
67 #include <openssl/x509v3.h>
68
69 static int v3_check_critical(char **value);
70 static int v3_check_generic(char **value);
71 static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid, int crit, char *value);
72 static X509_EXTENSION *v3_generic_extension(const char *ext, char *value, int crit, int type, X509V3_CTX *ctx);
73 static char *conf_lhash_get_string(void *db, char *section, char *value);
74 static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, char *section);
75 static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, int ext_nid,
76 int crit, void *ext_struc);
77 static unsigned char *generic_asn1(char *value, X509V3_CTX *ctx, long *ext_len);
78 /* CONF *conf: Config file */
79 /* char *name: Name */
80 /* char *value: Value */
81 X509_EXTENSION *X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, char *name,
82 char *value)
83 {
84 int crit;
85 int ext_type;
86 X509_EXTENSION *ret;
87 crit = v3_check_critical(&value);
88 if ((ext_type = v3_check_generic(&value)))
89 return v3_generic_extension(name, value, crit, ext_type, ctx);
90 ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value);
91 if (!ret)
92 {
93 X509V3err(X509V3_F_X509V3_EXT_NCONF,X509V3_R_ERROR_IN_EXTENSION);
94 ERR_add_error_data(4,"name=", name, ", value=", value);
95 }
96 return ret;
97 }
98
99 /* CONF *conf: Config file */
100 /* char *value: Value */
101 X509_EXTENSION *X509V3_EXT_nconf_nid(CONF *conf, X509V3_CTX *ctx, int ext_nid,
102 char *value)
103 {
104 int crit;
105 int ext_type;
106 crit = v3_check_critical(&value);
107 if ((ext_type = v3_check_generic(&value)))
108 return v3_generic_extension(OBJ_nid2sn(ext_nid),
109 value, crit, ext_type, ctx);
110 return do_ext_nconf(conf, ctx, ext_nid, crit, value);
111 }
112
113 /* CONF *conf: Config file */
114 /* char *value: Value */
115 static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid,
116 int crit, char *value)
117 {
118 const X509V3_EXT_METHOD *method;
119 X509_EXTENSION *ext;
120 STACK_OF(CONF_VALUE) *nval;
121 void *ext_struc;
122 if (ext_nid == NID_undef)
123 {
124 X509V3err(X509V3_F_DO_EXT_NCONF,X509V3_R_UNKNOWN_EXTENSION_NAME);
125 return NULL;
126 }
127 if (!(method = X509V3_EXT_get_nid(ext_nid)))
128 {
129 X509V3err(X509V3_F_DO_EXT_NCONF,X509V3_R_UNKNOWN_EXTENSION);
130 return NULL;
131 }
132 /* Now get internal extension representation based on type */
133 if (method->v2i)
134 {
135 if(*value == '@') nval = NCONF_get_section(conf, value + 1);
136 else nval = X509V3_parse_list(value);
137 if(sk_CONF_VALUE_num(nval) <= 0)
138 {
139 X509V3err(X509V3_F_DO_EXT_NCONF,X509V3_R_INVALID_EXTENSION_STRING);
140 ERR_add_error_data(4, "name=", OBJ_nid2sn(ext_nid), ",section=", value);
141 return NULL;
142 }
143 ext_struc = method->v2i(method, ctx, nval);
144 if(*value != '@') sk_CONF_VALUE_pop_free(nval,
145 X509V3_conf_free);
146 if(!ext_struc) return NULL;
147 }
148 else if(method->s2i)
149 {
150 if(!(ext_struc = method->s2i(method, ctx, value))) return NULL;
151 }
152 else if(method->r2i)
153 {
154 if(!ctx->db || !ctx->db_meth)
155 {
156 X509V3err(X509V3_F_DO_EXT_NCONF,X509V3_R_NO_CONFIG_DATABASE);
157 return NULL;
158 }
159 if(!(ext_struc = method->r2i(method, ctx, value))) return NULL;
160 }
161 else
162 {
163 X509V3err(X509V3_F_DO_EXT_NCONF,X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED);
164 ERR_add_error_data(2, "name=", OBJ_nid2sn(ext_nid));
165 return NULL;
166 }
167
168 ext = do_ext_i2d(method, ext_nid, crit, ext_struc);
169 if(method->it) ASN1_item_free(ext_struc, ASN1_ITEM_ptr(method->it));
170 else method->ext_free(ext_struc);
171 return ext;
172
173 }
174
175 static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, int ext_nid,
176 int crit, void *ext_struc)
177 {
178 unsigned char *ext_der;
179 int ext_len;
180 ASN1_OCTET_STRING *ext_oct;
181 X509_EXTENSION *ext;
182 /* Convert internal representation to DER */
183 if (method->it)
184 {
185 ext_der = NULL;
186 ext_len = ASN1_item_i2d(ext_struc, &ext_der, ASN1_ITEM_ptr(method->it));
187 if (ext_len < 0) goto merr;
188 }
189 else
190 {
191 unsigned char *p;
192 ext_len = method->i2d(ext_struc, NULL);
193 if(!(ext_der = OPENSSL_malloc(ext_len))) goto merr;
194 p = ext_der;
195 method->i2d(ext_struc, &p);
196 }
197 if (!(ext_oct = M_ASN1_OCTET_STRING_new())) goto merr;
198 ext_oct->data = ext_der;
199 ext_oct->length = ext_len;
200
201 ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct);
202 if (!ext) goto merr;
203 M_ASN1_OCTET_STRING_free(ext_oct);
204
205 return ext;
206
207 merr:
208 X509V3err(X509V3_F_DO_EXT_I2D,ERR_R_MALLOC_FAILURE);
209 return NULL;
210
211 }
212
213 /* Given an internal structure, nid and critical flag create an extension */
214
215 X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc)
216 {
217 const X509V3_EXT_METHOD *method;
218 if (!(method = X509V3_EXT_get_nid(ext_nid))) {
219 X509V3err(X509V3_F_X509V3_EXT_I2D,X509V3_R_UNKNOWN_EXTENSION);
220 return NULL;
221 }
222 return do_ext_i2d(method, ext_nid, crit, ext_struc);
223 }
224
225 /* Check the extension string for critical flag */
226 static int v3_check_critical(char **value)
227 {
228 char *p = *value;
229 if ((strlen(p) < 9) || strncmp(p, "critical,", 9)) return 0;
230 p+=9;
231 while(isspace((unsigned char)*p)) p++;
232 *value = p;
233 return 1;
234 }
235
236 /* Check extension string for generic extension and return the type */
237 static int v3_check_generic(char **value)
238 {
239 int gen_type = 0;
240 char *p = *value;
241 if ((strlen(p) >= 4) && !strncmp(p, "DER:", 4))
242 {
243 p+=4;
244 gen_type = 1;
245 }
246 else if ((strlen(p) >= 5) && !strncmp(p, "ASN1:", 5))
247 {
248 p+=5;
249 gen_type = 2;
250 }
251 else
252 return 0;
253
254 while (isspace((unsigned char)*p)) p++;
255 *value = p;
256 return gen_type;
257 }
258
259 /* Create a generic extension: for now just handle DER type */
260 static X509_EXTENSION *v3_generic_extension(const char *ext, char *value,
261 int crit, int gen_type,
262 X509V3_CTX *ctx)
263 {
264 unsigned char *ext_der=NULL;
265 long ext_len;
266 ASN1_OBJECT *obj=NULL;
267 ASN1_OCTET_STRING *oct=NULL;
268 X509_EXTENSION *extension=NULL;
269 if (!(obj = OBJ_txt2obj(ext, 0)))
270 {
271 X509V3err(X509V3_F_V3_GENERIC_EXTENSION,X509V3_R_EXTENSION_NAME_ERROR);
272 ERR_add_error_data(2, "name=", ext);
273 goto err;
274 }
275
276 if (gen_type == 1)
277 ext_der = string_to_hex(value, &ext_len);
278 else if (gen_type == 2)
279 ext_der = generic_asn1(value, ctx, &ext_len);
280
281 if (ext_der == NULL)
282 {
283 X509V3err(X509V3_F_V3_GENERIC_EXTENSION,X509V3_R_EXTENSION_VALUE_ERROR);
284 ERR_add_error_data(2, "value=", value);
285 goto err;
286 }
287
288 if (!(oct = M_ASN1_OCTET_STRING_new()))
289 {
290 X509V3err(X509V3_F_V3_GENERIC_EXTENSION,ERR_R_MALLOC_FAILURE);
291 goto err;
292 }
293
294 oct->data = ext_der;
295 oct->length = ext_len;
296 ext_der = NULL;
297
298 extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct);
299
300 err:
301 ASN1_OBJECT_free(obj);
302 M_ASN1_OCTET_STRING_free(oct);
303 if(ext_der) OPENSSL_free(ext_der);
304 return extension;
305
306 }
307
308 static unsigned char *generic_asn1(char *value, X509V3_CTX *ctx, long *ext_len)
309 {
310 ASN1_TYPE *typ;
311 unsigned char *ext_der = NULL;
312 typ = ASN1_generate_v3(value, ctx);
313 if (typ == NULL)
314 return NULL;
315 *ext_len = i2d_ASN1_TYPE(typ, &ext_der);
316 ASN1_TYPE_free(typ);
317 return ext_der;
318 }
319
320 /* This is the main function: add a bunch of extensions based on a config file
321 * section to an extension STACK.
322 */
323
324
325 int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, char *section,
326 STACK_OF(X509_EXTENSION) **sk)
327 {
328 X509_EXTENSION *ext;
329 STACK_OF(CONF_VALUE) *nval;
330 CONF_VALUE *val;
331 int i;
332 if (!(nval = NCONF_get_section(conf, section))) return 0;
333 for (i = 0; i < sk_CONF_VALUE_num(nval); i++)
334 {
335 val = sk_CONF_VALUE_value(nval, i);
336 if (!(ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value)))
337 return 0;
338 if (sk) X509v3_add_ext(sk, ext, -1);
339 X509_EXTENSION_free(ext);
340 }
341 return 1;
342 }
343
344 /* Convenience functions to add extensions to a certificate, CRL and request */
345
346 int X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
347 X509 *cert)
348 {
349 STACK_OF(X509_EXTENSION) **sk = NULL;
350 if (cert)
351 sk = &cert->cert_info->extensions;
352 return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
353 }
354
355 /* Same as above but for a CRL */
356
357 int X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
358 X509_CRL *crl)
359 {
360 STACK_OF(X509_EXTENSION) **sk = NULL;
361 if (crl)
362 sk = &crl->crl->extensions;
363 return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
364 }
365
366 /* Add extensions to certificate request */
367
368 int X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
369 X509_REQ *req)
370 {
371 STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL;
372 int i;
373 if (req)
374 sk = &extlist;
375 i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
376 if (!i || !sk)
377 return i;
378 i = X509_REQ_add_extensions(req, extlist);
379 sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free);
380 return i;
381 }
382
383 /* Config database functions */
384
385 char * X509V3_get_string(X509V3_CTX *ctx, char *name, char *section)
386 {
387 if(!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string)
388 {
389 X509V3err(X509V3_F_X509V3_GET_STRING,X509V3_R_OPERATION_NOT_DEFINED);
390 return NULL;
391 }
392 if (ctx->db_meth->get_string)
393 return ctx->db_meth->get_string(ctx->db, name, section);
394 return NULL;
395 }
396
397 STACK_OF(CONF_VALUE) * X509V3_get_section(X509V3_CTX *ctx, char *section)
398 {
399 if(!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section)
400 {
401 X509V3err(X509V3_F_X509V3_GET_SECTION,X509V3_R_OPERATION_NOT_DEFINED);
402 return NULL;
403 }
404 if (ctx->db_meth->get_section)
405 return ctx->db_meth->get_section(ctx->db, section);
406 return NULL;
407 }
408
409 void X509V3_string_free(X509V3_CTX *ctx, char *str)
410 {
411 if (!str) return;
412 if (ctx->db_meth->free_string)
413 ctx->db_meth->free_string(ctx->db, str);
414 }
415
416 void X509V3_section_free(X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *section)
417 {
418 if (!section) return;
419 if (ctx->db_meth->free_section)
420 ctx->db_meth->free_section(ctx->db, section);
421 }
422
423 static char *nconf_get_string(void *db, char *section, char *value)
424 {
425 return NCONF_get_string(db, section, value);
426 }
427
428 static STACK_OF(CONF_VALUE) *nconf_get_section(void *db, char *section)
429 {
430 return NCONF_get_section(db, section);
431 }
432
433 static X509V3_CONF_METHOD nconf_method = {
434 nconf_get_string,
435 nconf_get_section,
436 NULL,
437 NULL
438 };
439
440 void X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf)
441 {
442 ctx->db_meth = &nconf_method;
443 ctx->db = conf;
444 }
445
446 void X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req,
447 X509_CRL *crl, int flags)
448 {
449 ctx->issuer_cert = issuer;
450 ctx->subject_cert = subj;
451 ctx->crl = crl;
452 ctx->subject_req = req;
453 ctx->flags = flags;
454 }
455
456 /* Old conf compatibility functions */
457
458 X509_EXTENSION *X509V3_EXT_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
459 char *name, char *value)
460 {
461 CONF ctmp;
462 CONF_set_nconf(&ctmp, conf);
463 return X509V3_EXT_nconf(&ctmp, ctx, name, value);
464 }
465
466 /* LHASH *conf: Config file */
467 /* char *value: Value */
468 X509_EXTENSION *X509V3_EXT_conf_nid(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
469 int ext_nid, char *value)
470 {
471 CONF ctmp;
472 CONF_set_nconf(&ctmp, conf);
473 return X509V3_EXT_nconf_nid(&ctmp, ctx, ext_nid, value);
474 }
475
476 static char *conf_lhash_get_string(void *db, char *section, char *value)
477 {
478 return CONF_get_string(db, section, value);
479 }
480
481 static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, char *section)
482 {
483 return CONF_get_section(db, section);
484 }
485
486 static X509V3_CONF_METHOD conf_lhash_method = {
487 conf_lhash_get_string,
488 conf_lhash_get_section,
489 NULL,
490 NULL
491 };
492
493 void X509V3_set_conf_lhash(X509V3_CTX *ctx, LHASH_OF(CONF_VALUE) *lhash)
494 {
495 ctx->db_meth = &conf_lhash_method;
496 ctx->db = lhash;
497 }
498
499 int X509V3_EXT_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
500 char *section, X509 *cert)
501 {
502 CONF ctmp;
503 CONF_set_nconf(&ctmp, conf);
504 return X509V3_EXT_add_nconf(&ctmp, ctx, section, cert);
505 }
506
507 /* Same as above but for a CRL */
508
509 int X509V3_EXT_CRL_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
510 char *section, X509_CRL *crl)
511 {
512 CONF ctmp;
513 CONF_set_nconf(&ctmp, conf);
514 return X509V3_EXT_CRL_add_nconf(&ctmp, ctx, section, crl);
515 }
516
517 /* Add extensions to certificate request */
518
519 int X509V3_EXT_REQ_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
520 char *section, X509_REQ *req)
521 {
522 CONF ctmp;
523 CONF_set_nconf(&ctmp, conf);
524 return X509V3_EXT_REQ_add_nconf(&ctmp, ctx, section, req);
525 }