1 /*
2 * Copyright 1999-2018 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (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 */
X509V3_EXT_nconf(CONF * conf,X509V3_CTX * ctx,const char * name,const char * 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 */
X509V3_EXT_nconf_nid(CONF * conf,X509V3_CTX * ctx,int ext_nid,const char * 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 */
do_ext_nconf(CONF * conf,X509V3_CTX * ctx,int ext_nid,int crit,const char * 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
do_ext_i2d(const X509V3_EXT_METHOD * method,int ext_nid,int crit,void * ext_struc)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
X509V3_EXT_i2d(int ext_nid,int crit,void * ext_struc)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 */
v3_check_critical(const char ** value)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 */
v3_check_generic(const char ** value)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 */
v3_generic_extension(const char * ext,const char * value,int crit,int gen_type,X509V3_CTX * ctx)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
generic_asn1(const char * value,X509V3_CTX * ctx,long * ext_len)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
delete_ext(STACK_OF (X509_EXTENSION)* sk,X509_EXTENSION * dext)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
X509V3_EXT_add_nconf_sk(CONF * conf,X509V3_CTX * ctx,const char * section,STACK_OF (X509_EXTENSION)** sk)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
X509V3_EXT_add_nconf(CONF * conf,X509V3_CTX * ctx,const char * section,X509 * cert)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
X509V3_EXT_CRL_add_nconf(CONF * conf,X509V3_CTX * ctx,const char * section,X509_CRL * crl)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
X509V3_EXT_REQ_add_nconf(CONF * conf,X509V3_CTX * ctx,const char * section,X509_REQ * req)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
X509V3_get_string(X509V3_CTX * ctx,const char * name,const char * section)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
STACK_OF(CONF_VALUE)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
X509V3_string_free(X509V3_CTX * ctx,char * str)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
X509V3_section_free(X509V3_CTX * ctx,STACK_OF (CONF_VALUE)* section)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
nconf_get_string(void * db,const char * section,const char * value)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
STACK_OF(CONF_VALUE)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
X509V3_set_nconf(X509V3_CTX * ctx,CONF * conf)426 void X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf)
427 {
428 ctx->db_meth = &nconf_method;
429 ctx->db = conf;
430 }
431
X509V3_set_ctx(X509V3_CTX * ctx,X509 * issuer,X509 * subj,X509_REQ * req,X509_CRL * crl,int flags)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
X509V3_EXT_conf(LHASH_OF (CONF_VALUE)* conf,X509V3_CTX * ctx,const char * name,const char * value)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 */
X509V3_EXT_conf_nid(LHASH_OF (CONF_VALUE)* conf,X509V3_CTX * ctx,int ext_nid,const char * 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
conf_lhash_get_string(void * db,const char * section,const char * value)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
STACK_OF(CONF_VALUE)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
X509V3_set_conf_lhash(X509V3_CTX * ctx,LHASH_OF (CONF_VALUE)* lhash)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
X509V3_EXT_add_conf(LHASH_OF (CONF_VALUE)* conf,X509V3_CTX * ctx,const char * section,X509 * cert)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
X509V3_EXT_CRL_add_conf(LHASH_OF (CONF_VALUE)* conf,X509V3_CTX * ctx,const char * section,X509_CRL * crl)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
X509V3_EXT_REQ_add_conf(LHASH_OF (CONF_VALUE)* conf,X509V3_CTX * ctx,const char * section,X509_REQ * req)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