2 * Copyright 1999-2020 The OpenSSL Project Authors. All Rights Reserved.
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
10 /* extension creation utilities */
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>
20 DEFINE_STACK_OF(CONF_VALUE)
21 DEFINE_STACK_OF(X509_EXTENSION)
23 static int v3_check_critical(const char **value);
24 static int v3_check_generic(const char **value);
25 static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid,
26 int crit, const char *value);
27 static X509_EXTENSION *v3_generic_extension(const char *ext, const char *value,
30 static char *conf_lhash_get_string(void *db, const char *section, const char *value);
31 static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, const char *section);
32 static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method,
33 int ext_nid, int crit, void *ext_struc);
34 static unsigned char *generic_asn1(const char *value, X509V3_CTX *ctx,
36 /* CONF *conf: Config file */
37 /* char *name: Name */
38 /* char *value: Value */
39 X509_EXTENSION *X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, const char *name,
45 crit = v3_check_critical(&value);
46 if ((ext_type = v3_check_generic(&value)))
47 return v3_generic_extension(name, value, crit, ext_type, ctx);
48 ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value);
50 X509V3err(X509V3_F_X509V3_EXT_NCONF, X509V3_R_ERROR_IN_EXTENSION);
51 ERR_add_error_data(4, "name=", name, ", value=", value);
56 /* CONF *conf: Config file */
57 /* char *value: Value */
58 X509_EXTENSION *X509V3_EXT_nconf_nid(CONF *conf, X509V3_CTX *ctx, int ext_nid,
63 crit = v3_check_critical(&value);
64 if ((ext_type = v3_check_generic(&value)))
65 return v3_generic_extension(OBJ_nid2sn(ext_nid),
66 value, crit, ext_type, ctx);
67 return do_ext_nconf(conf, ctx, ext_nid, crit, value);
70 /* CONF *conf: Config file */
71 /* char *value: Value */
72 static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid,
73 int crit, const char *value)
75 const X509V3_EXT_METHOD *method;
77 STACK_OF(CONF_VALUE) *nval;
80 if (ext_nid == NID_undef) {
81 X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_UNKNOWN_EXTENSION_NAME);
84 if ((method = X509V3_EXT_get_nid(ext_nid)) == NULL) {
85 X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_UNKNOWN_EXTENSION);
88 /* Now get internal extension representation based on type */
91 nval = NCONF_get_section(conf, value + 1);
93 nval = X509V3_parse_list(value);
94 if (nval == NULL || sk_CONF_VALUE_num(nval) <= 0) {
95 X509V3err(X509V3_F_DO_EXT_NCONF,
96 X509V3_R_INVALID_EXTENSION_STRING);
97 ERR_add_error_data(4, "name=", OBJ_nid2sn(ext_nid), ",section=",
100 sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);
103 ext_struc = method->v2i(method, ctx, nval);
105 sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);
108 } else if (method->s2i) {
109 if ((ext_struc = method->s2i(method, ctx, value)) == NULL)
111 } else if (method->r2i) {
112 if (!ctx->db || !ctx->db_meth) {
113 X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_NO_CONFIG_DATABASE);
116 if ((ext_struc = method->r2i(method, ctx, value)) == NULL)
119 X509V3err(X509V3_F_DO_EXT_NCONF,
120 X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED);
121 ERR_add_error_data(2, "name=", OBJ_nid2sn(ext_nid));
125 ext = do_ext_i2d(method, ext_nid, crit, ext_struc);
127 ASN1_item_free(ext_struc, ASN1_ITEM_ptr(method->it));
129 method->ext_free(ext_struc);
134 static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method,
135 int ext_nid, int crit, void *ext_struc)
137 unsigned char *ext_der = NULL;
139 ASN1_OCTET_STRING *ext_oct = NULL;
141 /* Convert internal representation to DER */
145 ASN1_item_i2d(ext_struc, &ext_der, ASN1_ITEM_ptr(method->it));
151 ext_len = method->i2d(ext_struc, NULL);
152 if ((ext_der = OPENSSL_malloc(ext_len)) == NULL)
155 method->i2d(ext_struc, &p);
157 if ((ext_oct = ASN1_OCTET_STRING_new()) == NULL)
159 ext_oct->data = ext_der;
161 ext_oct->length = ext_len;
163 ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct);
166 ASN1_OCTET_STRING_free(ext_oct);
171 X509V3err(X509V3_F_DO_EXT_I2D, ERR_R_MALLOC_FAILURE);
172 OPENSSL_free(ext_der);
173 ASN1_OCTET_STRING_free(ext_oct);
178 /* Given an internal structure, nid and critical flag create an extension */
180 X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc)
182 const X509V3_EXT_METHOD *method;
184 if ((method = X509V3_EXT_get_nid(ext_nid)) == NULL) {
185 X509V3err(X509V3_F_X509V3_EXT_I2D, X509V3_R_UNKNOWN_EXTENSION);
188 return do_ext_i2d(method, ext_nid, crit, ext_struc);
191 /* Check the extension string for critical flag */
192 static int v3_check_critical(const char **value)
194 const char *p = *value;
195 if ((strlen(p) < 9) || strncmp(p, "critical,", 9))
198 while (ossl_isspace(*p))
204 /* Check extension string for generic extension and return the type */
205 static int v3_check_generic(const char **value)
208 const char *p = *value;
209 if ((strlen(p) >= 4) && strncmp(p, "DER:", 4) == 0) {
212 } else if ((strlen(p) >= 5) && strncmp(p, "ASN1:", 5) == 0) {
218 while (ossl_isspace(*p))
224 /* Create a generic extension: for now just handle DER type */
225 static X509_EXTENSION *v3_generic_extension(const char *ext, const char *value,
226 int crit, int gen_type,
229 unsigned char *ext_der = NULL;
231 ASN1_OBJECT *obj = NULL;
232 ASN1_OCTET_STRING *oct = NULL;
233 X509_EXTENSION *extension = NULL;
235 if ((obj = OBJ_txt2obj(ext, 0)) == NULL) {
236 X509V3err(X509V3_F_V3_GENERIC_EXTENSION,
237 X509V3_R_EXTENSION_NAME_ERROR);
238 ERR_add_error_data(2, "name=", ext);
243 ext_der = OPENSSL_hexstr2buf(value, &ext_len);
244 else if (gen_type == 2)
245 ext_der = generic_asn1(value, ctx, &ext_len);
247 if (ext_der == NULL) {
248 X509V3err(X509V3_F_V3_GENERIC_EXTENSION,
249 X509V3_R_EXTENSION_VALUE_ERROR);
250 ERR_add_error_data(2, "value=", value);
254 if ((oct = ASN1_OCTET_STRING_new()) == NULL) {
255 X509V3err(X509V3_F_V3_GENERIC_EXTENSION, ERR_R_MALLOC_FAILURE);
260 oct->length = ext_len;
263 extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct);
266 ASN1_OBJECT_free(obj);
267 ASN1_OCTET_STRING_free(oct);
268 OPENSSL_free(ext_der);
273 static unsigned char *generic_asn1(const char *value, X509V3_CTX *ctx,
277 unsigned char *ext_der = NULL;
278 typ = ASN1_generate_v3(value, ctx);
281 *ext_len = i2d_ASN1_TYPE(typ, &ext_der);
286 static void delete_ext(STACK_OF(X509_EXTENSION) *sk, X509_EXTENSION *dext)
290 obj = X509_EXTENSION_get_object(dext);
291 while ((idx = X509v3_get_ext_by_OBJ(sk, obj, -1)) >= 0) {
292 X509_EXTENSION *tmpext = X509v3_get_ext(sk, idx);
293 X509v3_delete_ext(sk, idx);
294 X509_EXTENSION_free(tmpext);
299 * This is the main function: add a bunch of extensions based on a config
300 * file section to an extension STACK.
303 int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, const char *section,
304 STACK_OF(X509_EXTENSION) **sk)
307 STACK_OF(CONF_VALUE) *nval;
311 if ((nval = NCONF_get_section(conf, section)) == NULL)
313 for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
314 val = sk_CONF_VALUE_value(nval, i);
315 if ((ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value)) == NULL)
317 if (ctx->flags == X509V3_CTX_REPLACE)
318 delete_ext(*sk, ext);
320 if (X509v3_add_ext(sk, ext, -1) == NULL) {
321 X509_EXTENSION_free(ext);
325 X509_EXTENSION_free(ext);
331 * Convenience functions to add extensions to a certificate, CRL and request
334 int X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,
337 STACK_OF(X509_EXTENSION) **sk = NULL;
339 sk = &cert->cert_info.extensions;
340 return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
343 /* Same as above but for a CRL */
345 int X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,
348 STACK_OF(X509_EXTENSION) **sk = NULL;
350 sk = &crl->crl.extensions;
351 return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
354 /* Add extensions to certificate request */
356 int X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,
359 STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL;
363 i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
366 i = X509_REQ_add_extensions(req, extlist);
367 sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free);
371 /* Config database functions */
373 char *X509V3_get_string(X509V3_CTX *ctx, const char *name, const char *section)
375 if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string) {
376 X509V3err(X509V3_F_X509V3_GET_STRING, X509V3_R_OPERATION_NOT_DEFINED);
379 if (ctx->db_meth->get_string)
380 return ctx->db_meth->get_string(ctx->db, name, section);
384 STACK_OF(CONF_VALUE) *X509V3_get_section(X509V3_CTX *ctx, const char *section)
386 if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section) {
387 X509V3err(X509V3_F_X509V3_GET_SECTION,
388 X509V3_R_OPERATION_NOT_DEFINED);
391 if (ctx->db_meth->get_section)
392 return ctx->db_meth->get_section(ctx->db, section);
396 void X509V3_string_free(X509V3_CTX *ctx, char *str)
400 if (ctx->db_meth->free_string)
401 ctx->db_meth->free_string(ctx->db, str);
404 void X509V3_section_free(X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *section)
408 if (ctx->db_meth->free_section)
409 ctx->db_meth->free_section(ctx->db, section);
412 static char *nconf_get_string(void *db, const char *section, const char *value)
414 return NCONF_get_string(db, section, value);
417 static STACK_OF(CONF_VALUE) *nconf_get_section(void *db, const char *section)
419 return NCONF_get_section(db, section);
422 static X509V3_CONF_METHOD nconf_method = {
429 void X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf)
431 ctx->db_meth = &nconf_method;
435 void X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req,
436 X509_CRL *crl, int flags)
438 ctx->issuer_cert = issuer;
439 ctx->subject_cert = subj;
441 ctx->subject_req = req;
445 /* Old conf compatibility functions */
447 X509_EXTENSION *X509V3_EXT_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
448 const char *name, const char *value)
451 CONF_set_nconf(&ctmp, conf);
452 return X509V3_EXT_nconf(&ctmp, ctx, name, value);
455 /* LHASH *conf: Config file */
456 /* char *value: Value */
457 X509_EXTENSION *X509V3_EXT_conf_nid(LHASH_OF(CONF_VALUE) *conf,
458 X509V3_CTX *ctx, int ext_nid, const char *value)
461 CONF_set_nconf(&ctmp, conf);
462 return X509V3_EXT_nconf_nid(&ctmp, ctx, ext_nid, value);
465 static char *conf_lhash_get_string(void *db, const char *section, const char *value)
467 return CONF_get_string(db, section, value);
470 static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, const char *section)
472 return CONF_get_section(db, section);
475 static X509V3_CONF_METHOD conf_lhash_method = {
476 conf_lhash_get_string,
477 conf_lhash_get_section,
482 void X509V3_set_conf_lhash(X509V3_CTX *ctx, LHASH_OF(CONF_VALUE) *lhash)
484 ctx->db_meth = &conf_lhash_method;
488 int X509V3_EXT_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
489 const char *section, X509 *cert)
492 CONF_set_nconf(&ctmp, conf);
493 return X509V3_EXT_add_nconf(&ctmp, ctx, section, cert);
496 /* Same as above but for a CRL */
498 int X509V3_EXT_CRL_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
499 const char *section, X509_CRL *crl)
502 CONF_set_nconf(&ctmp, conf);
503 return X509V3_EXT_CRL_add_nconf(&ctmp, ctx, section, crl);
506 /* Add extensions to certificate request */
508 int X509V3_EXT_REQ_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
509 const char *section, X509_REQ *req)
512 CONF_set_nconf(&ctmp, conf);
513 return X509V3_EXT_REQ_add_nconf(&ctmp, ctx, section, req);