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v3_conf.c
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1 /* v3_conf.c */
2 /* Written by Dr Stephen N Henson ([email protected]) 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
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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
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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  * ([email protected]). This product includes software written by Tim
55  * Hudson ([email protected]).
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  {
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 */
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;
120  STACK_OF(CONF_VALUE) *nval;
121  void *ext_struc;
122  if (ext_nid == NID_undef)
123  {
125  return NULL;
126  }
127  if (!(method = X509V3_EXT_get_nid(ext_nid)))
128  {
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  {
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,
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  {
157  return NULL;
158  }
159  if(!(ext_struc = method->r2i(method, ctx, value))) return NULL;
160  }
161  else
162  {
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;
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:
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))) {
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  {
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  {
284  ERR_add_error_data(2, "value=", value);
285  goto err;
286  }
287 
288  if (!(oct = M_ASN1_OCTET_STRING_new()))
289  {
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);
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  {
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  {
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  {
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 
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 
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 
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 */
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 
494  {
495  ctx->db_meth = &conf_lhash_method;
496  ctx->db = lhash;
497  }
498 
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 
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 
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  }