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/* extension creation utilities */
58
59#include <stdio.h>
60#include <ctype.h>
61
62#include <openssl/conf.h>
63#include <openssl/err.h>
64#include <openssl/mem.h>
65#include <openssl/obj.h>
66#include <openssl/x509.h>
67#include <openssl/x509v3.h>
68
69
70static int v3_check_critical(char **value);
71static int v3_check_generic(char **value);
72static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid, int crit, char *value);
73static X509_EXTENSION *v3_generic_extension(const char *ext, char *value, int crit, int type, X509V3_CTX *ctx);
74static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, int ext_nid,
75				  int crit, void *ext_struc);
76static unsigned char *generic_asn1(char *value, X509V3_CTX *ctx, long *ext_len);
77/* CONF *conf:  Config file    */
78/* char *name:  Name    */
79/* char *value:  Value    */
80X509_EXTENSION *X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, char *name,
81				 char *value)
82	{
83	int crit;
84	int ext_type;
85	X509_EXTENSION *ret;
86	crit = v3_check_critical(&value);
87	if ((ext_type = v3_check_generic(&value)))
88		return v3_generic_extension(name, value, crit, ext_type, ctx);
89	ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value);
90	if (!ret)
91		{
92		OPENSSL_PUT_ERROR(X509V3, X509V3_EXT_nconf, X509V3_R_ERROR_IN_EXTENSION);
93		ERR_add_error_data(4,"name=", name, ", value=", value);
94		}
95	return ret;
96	}
97
98/* CONF *conf:  Config file    */
99/* char *value:  Value    */
100X509_EXTENSION *X509V3_EXT_nconf_nid(CONF *conf, X509V3_CTX *ctx, int ext_nid,
101				     char *value)
102	{
103	int crit;
104	int ext_type;
105	crit = v3_check_critical(&value);
106	if ((ext_type = v3_check_generic(&value)))
107		return v3_generic_extension(OBJ_nid2sn(ext_nid),
108						 value, crit, ext_type, ctx);
109	return do_ext_nconf(conf, ctx, ext_nid, crit, value);
110	}
111
112/* CONF *conf:  Config file    */
113/* char *value:  Value    */
114static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid,
115				    int crit, char *value)
116	{
117	const X509V3_EXT_METHOD *method;
118	X509_EXTENSION *ext;
119	STACK_OF(CONF_VALUE) *nval;
120	void *ext_struc;
121	if (ext_nid == NID_undef)
122		{
123		OPENSSL_PUT_ERROR(X509V3, do_ext_nconf, X509V3_R_UNKNOWN_EXTENSION_NAME);
124		return NULL;
125		}
126	if (!(method = X509V3_EXT_get_nid(ext_nid)))
127		{
128		OPENSSL_PUT_ERROR(X509V3, do_ext_nconf, X509V3_R_UNKNOWN_EXTENSION);
129		return NULL;
130		}
131	/* Now get internal extension representation based on type */
132	if (method->v2i)
133		{
134		if(*value == '@') nval = NCONF_get_section(conf, value + 1);
135		else nval = X509V3_parse_list(value);
136		if(sk_CONF_VALUE_num(nval) <= 0)
137			{
138			OPENSSL_PUT_ERROR(X509V3, do_ext_nconf, X509V3_R_INVALID_EXTENSION_STRING);
139			ERR_add_error_data(4, "name=", OBJ_nid2sn(ext_nid), ",section=", value);
140			return NULL;
141			}
142		ext_struc = method->v2i(method, ctx, nval);
143		if(*value != '@') sk_CONF_VALUE_pop_free(nval,
144							 X509V3_conf_free);
145		if(!ext_struc) return NULL;
146		}
147	else if(method->s2i)
148		{
149		if(!(ext_struc = method->s2i(method, ctx, value))) return NULL;
150		}
151	else if(method->r2i)
152		{
153		if(!ctx->db || !ctx->db_meth)
154			{
155			OPENSSL_PUT_ERROR(X509V3, do_ext_nconf, X509V3_R_NO_CONFIG_DATABASE);
156			return NULL;
157			}
158		if(!(ext_struc = method->r2i(method, ctx, value))) return NULL;
159		}
160	else
161		{
162		OPENSSL_PUT_ERROR(X509V3, do_ext_nconf, X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED);
163		ERR_add_error_data(2, "name=", OBJ_nid2sn(ext_nid));
164		return NULL;
165		}
166
167	ext  = do_ext_i2d(method, ext_nid, crit, ext_struc);
168	if(method->it) ASN1_item_free(ext_struc, ASN1_ITEM_ptr(method->it));
169	else method->ext_free(ext_struc);
170	return ext;
171
172	}
173
174static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, int ext_nid,
175				  int crit, void *ext_struc)
176	{
177	unsigned char *ext_der;
178	int ext_len;
179	ASN1_OCTET_STRING *ext_oct;
180	X509_EXTENSION *ext;
181	/* Convert internal representation to DER */
182	if (method->it)
183		{
184		ext_der = NULL;
185		ext_len = ASN1_item_i2d(ext_struc, &ext_der, ASN1_ITEM_ptr(method->it));
186		if (ext_len < 0) goto merr;
187		}
188	 else
189		{
190		unsigned char *p;
191		ext_len = method->i2d(ext_struc, NULL);
192		if(!(ext_der = OPENSSL_malloc(ext_len))) goto merr;
193		p = ext_der;
194		method->i2d(ext_struc, &p);
195		}
196	if (!(ext_oct = M_ASN1_OCTET_STRING_new())) goto merr;
197	ext_oct->data = ext_der;
198	ext_oct->length = ext_len;
199
200	ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct);
201	if (!ext) goto merr;
202	M_ASN1_OCTET_STRING_free(ext_oct);
203
204	return ext;
205
206	merr:
207	OPENSSL_PUT_ERROR(X509V3, do_ext_i2d, ERR_R_MALLOC_FAILURE);
208	return NULL;
209
210	}
211
212/* Given an internal structure, nid and critical flag create an extension */
213
214X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc)
215	{
216	const X509V3_EXT_METHOD *method;
217	if (!(method = X509V3_EXT_get_nid(ext_nid))) {
218		OPENSSL_PUT_ERROR(X509V3, X509V3_EXT_i2d, X509V3_R_UNKNOWN_EXTENSION);
219		return NULL;
220	}
221	return do_ext_i2d(method, ext_nid, crit, ext_struc);
222}
223
224/* Check the extension string for critical flag */
225static int v3_check_critical(char **value)
226{
227	char *p = *value;
228	if ((strlen(p) < 9) || strncmp(p, "critical,", 9)) return 0;
229	p+=9;
230	while(isspace((unsigned char)*p)) p++;
231	*value = p;
232	return 1;
233}
234
235/* Check extension string for generic extension and return the type */
236static int v3_check_generic(char **value)
237{
238	int gen_type = 0;
239	char *p = *value;
240	if ((strlen(p) >= 4) && !strncmp(p, "DER:", 4))
241		{
242		p+=4;
243		gen_type = 1;
244		}
245	else if ((strlen(p) >= 5) && !strncmp(p, "ASN1:", 5))
246		{
247		p+=5;
248		gen_type = 2;
249		}
250	else
251		return 0;
252
253	while (isspace((unsigned char)*p)) p++;
254	*value = p;
255	return gen_type;
256}
257
258/* Create a generic extension: for now just handle DER type */
259static X509_EXTENSION *v3_generic_extension(const char *ext, char *value,
260					    int crit, int gen_type,
261					    X509V3_CTX *ctx)
262	{
263	unsigned char *ext_der=NULL;
264	long ext_len;
265	ASN1_OBJECT *obj=NULL;
266	ASN1_OCTET_STRING *oct=NULL;
267	X509_EXTENSION *extension=NULL;
268	if (!(obj = OBJ_txt2obj(ext, 0)))
269		{
270		OPENSSL_PUT_ERROR(X509V3, v3_generic_extension, X509V3_R_EXTENSION_NAME_ERROR);
271		ERR_add_error_data(2, "name=", ext);
272		goto err;
273		}
274
275	if (gen_type == 1)
276		ext_der = string_to_hex(value, &ext_len);
277	else if (gen_type == 2)
278		ext_der = generic_asn1(value, ctx, &ext_len);
279
280	if (ext_der == NULL)
281		{
282		OPENSSL_PUT_ERROR(X509V3, v3_generic_extension, X509V3_R_EXTENSION_VALUE_ERROR);
283		ERR_add_error_data(2, "value=", value);
284		goto err;
285		}
286
287	if (!(oct = M_ASN1_OCTET_STRING_new()))
288		{
289		OPENSSL_PUT_ERROR(X509V3, v3_generic_extension, ERR_R_MALLOC_FAILURE);
290		goto err;
291		}
292
293	oct->data = ext_der;
294	oct->length = ext_len;
295	ext_der = NULL;
296
297	extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct);
298
299	err:
300	ASN1_OBJECT_free(obj);
301	M_ASN1_OCTET_STRING_free(oct);
302	if(ext_der) OPENSSL_free(ext_der);
303	return extension;
304
305	}
306
307static unsigned char *generic_asn1(char *value, X509V3_CTX *ctx, long *ext_len)
308	{
309	ASN1_TYPE *typ;
310	unsigned char *ext_der = NULL;
311	typ = ASN1_generate_v3(value, ctx);
312	if (typ == NULL)
313		return NULL;
314	*ext_len = i2d_ASN1_TYPE(typ, &ext_der);
315	ASN1_TYPE_free(typ);
316	return ext_der;
317	}
318
319/* This is the main function: add a bunch of extensions based on a config file
320 * section to an extension STACK.
321 */
322
323
324int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, char *section,
325			    STACK_OF(X509_EXTENSION) **sk)
326	{
327	X509_EXTENSION *ext;
328	STACK_OF(CONF_VALUE) *nval;
329	CONF_VALUE *val;
330	size_t i;
331	if (!(nval = NCONF_get_section(conf, section))) return 0;
332	for (i = 0; i < sk_CONF_VALUE_num(nval); i++)
333		{
334		val = sk_CONF_VALUE_value(nval, i);
335		if (!(ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value)))
336								return 0;
337		if (sk) X509v3_add_ext(sk, ext, -1);
338		X509_EXTENSION_free(ext);
339		}
340	return 1;
341	}
342
343/* Convenience functions to add extensions to a certificate, CRL and request */
344
345int X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
346			 X509 *cert)
347	{
348	STACK_OF(X509_EXTENSION) **sk = NULL;
349	if (cert)
350		sk = &cert->cert_info->extensions;
351	return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
352	}
353
354/* Same as above but for a CRL */
355
356int X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
357			     X509_CRL *crl)
358	{
359	STACK_OF(X509_EXTENSION) **sk = NULL;
360	if (crl)
361		sk = &crl->crl->extensions;
362	return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
363	}
364
365/* Add extensions to certificate request */
366
367int X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
368	     X509_REQ *req)
369	{
370	STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL;
371	int i;
372	if (req)
373		sk = &extlist;
374	i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
375	if (!i || !sk)
376		return i;
377	i = X509_REQ_add_extensions(req, extlist);
378	sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free);
379	return i;
380	}
381
382/* Config database functions */
383
384char * X509V3_get_string(X509V3_CTX *ctx, char *name, char *section)
385	{
386	if(!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string)
387		{
388		OPENSSL_PUT_ERROR(X509V3, X509V3_get_string, X509V3_R_OPERATION_NOT_DEFINED);
389		return NULL;
390		}
391	if (ctx->db_meth->get_string)
392			return ctx->db_meth->get_string(ctx->db, name, section);
393	return NULL;
394	}
395
396STACK_OF(CONF_VALUE) * X509V3_get_section(X509V3_CTX *ctx, char *section)
397	{
398	if(!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section)
399		{
400		OPENSSL_PUT_ERROR(X509V3, X509V3_get_section, X509V3_R_OPERATION_NOT_DEFINED);
401		return NULL;
402		}
403	if (ctx->db_meth->get_section)
404			return ctx->db_meth->get_section(ctx->db, section);
405	return NULL;
406	}
407
408void X509V3_string_free(X509V3_CTX *ctx, char *str)
409	{
410	if (!str) return;
411	if (ctx->db_meth->free_string)
412			ctx->db_meth->free_string(ctx->db, str);
413	}
414
415void X509V3_section_free(X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *section)
416	{
417	if (!section) return;
418	if (ctx->db_meth->free_section)
419			ctx->db_meth->free_section(ctx->db, section);
420	}
421
422static char *nconf_get_string(void *db, char *section, char *value)
423	{
424        /* TODO(fork): this should return a const value. */
425	return (char *) NCONF_get_string(db, section, value);
426	}
427
428static STACK_OF(CONF_VALUE) *nconf_get_section(void *db, char *section)
429	{
430	return NCONF_get_section(db, section);
431	}
432
433static X509V3_CONF_METHOD nconf_method = {
434nconf_get_string,
435nconf_get_section,
436NULL,
437NULL
438};
439
440void X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf)
441	{
442	ctx->db_meth = &nconf_method;
443	ctx->db = conf;
444	}
445
446void 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/* TODO(fork): remove */
457#if 0
458/* Old conf compatibility functions */
459
460X509_EXTENSION *X509V3_EXT_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
461				char *name, char *value)
462	{
463	CONF ctmp;
464	CONF_set_nconf(&ctmp, conf);
465	return X509V3_EXT_nconf(&ctmp, ctx, name, value);
466	}
467
468/* LHASH *conf:  Config file    */
469/* char *value:  Value    */
470X509_EXTENSION *X509V3_EXT_conf_nid(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
471				    int ext_nid, char *value)
472	{
473	CONF ctmp;
474	CONF_set_nconf(&ctmp, conf);
475	return X509V3_EXT_nconf_nid(&ctmp, ctx, ext_nid, value);
476	}
477
478static char *conf_lhash_get_string(void *db, char *section, char *value)
479	{
480	return CONF_get_string(db, section, value);
481	}
482
483static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, char *section)
484	{
485	return CONF_get_section(db, section);
486	}
487
488static X509V3_CONF_METHOD conf_lhash_method = {
489conf_lhash_get_string,
490conf_lhash_get_section,
491NULL,
492NULL
493};
494
495void X509V3_set_conf_lhash(X509V3_CTX *ctx, LHASH_OF(CONF_VALUE) *lhash)
496	{
497	ctx->db_meth = &conf_lhash_method;
498	ctx->db = lhash;
499	}
500
501int X509V3_EXT_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
502			char *section, X509 *cert)
503	{
504	CONF ctmp;
505	CONF_set_nconf(&ctmp, conf);
506	return X509V3_EXT_add_nconf(&ctmp, ctx, section, cert);
507	}
508
509/* Same as above but for a CRL */
510
511int X509V3_EXT_CRL_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
512			    char *section, X509_CRL *crl)
513	{
514	CONF ctmp;
515	CONF_set_nconf(&ctmp, conf);
516	return X509V3_EXT_CRL_add_nconf(&ctmp, ctx, section, crl);
517	}
518
519/* Add extensions to certificate request */
520
521int X509V3_EXT_REQ_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
522			    char *section, X509_REQ *req)
523	{
524	CONF ctmp;
525	CONF_set_nconf(&ctmp, conf);
526	return X509V3_EXT_REQ_add_nconf(&ctmp, ctx, section, req);
527	}
528#endif
529