v3_conf.c revision 331638 
1/* v3_conf.c */
2/*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 * 1999.
5 */
6/* ====================================================================
7 * Copyright (c) 1999-2018 The OpenSSL Project.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in
18 *    the documentation and/or other materials provided with the
19 *    distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 *    software must display the following acknowledgment:
23 *    "This product includes software developed by the OpenSSL Project
24 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 *    endorse or promote products derived from this software without
28 *    prior written permission. For written permission, please contact
29 *    licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 *    nor may "OpenSSL" appear in their names without prior written
33 *    permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 *    acknowledgment:
37 *    "This product includes software developed by the OpenSSL Project
38 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com).  This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59/* extension creation utilities */
60
61#include <stdio.h>
62#include <ctype.h>
63#include "cryptlib.h"
64#include <openssl/conf.h>
65#include <openssl/x509.h>
66#include <openssl/x509v3.h>
67
68static int v3_check_critical(char **value);
69static int v3_check_generic(char **value);
70static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid,
71                                    int crit, char *value);
72static X509_EXTENSION *v3_generic_extension(const char *ext, char *value,
73                                            int crit, int type,
74                                            X509V3_CTX *ctx);
75static char *conf_lhash_get_string(void *db, char *section, char *value);
76static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, char *section);
77static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method,
78                                  int ext_nid, int crit, void *ext_struc);
79static unsigned char *generic_asn1(char *value, X509V3_CTX *ctx,
80                                   long *ext_len);
81/* CONF *conf:  Config file    */
82/* char *name:  Name    */
83/* char *value:  Value    */
84X509_EXTENSION *X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, char *name,
85                                 char *value)
86{
87    int crit;
88    int ext_type;
89    X509_EXTENSION *ret;
90    crit = v3_check_critical(&value);
91    if ((ext_type = v3_check_generic(&value)))
92        return v3_generic_extension(name, value, crit, ext_type, ctx);
93    ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value);
94    if (!ret) {
95        X509V3err(X509V3_F_X509V3_EXT_NCONF, X509V3_R_ERROR_IN_EXTENSION);
96        ERR_add_error_data(4, "name=", name, ", value=", value);
97    }
98    return ret;
99}
100
101/* CONF *conf:  Config file    */
102/* char *value:  Value    */
103X509_EXTENSION *X509V3_EXT_nconf_nid(CONF *conf, X509V3_CTX *ctx, int ext_nid,
104                                     char *value)
105{
106    int crit;
107    int ext_type;
108    crit = v3_check_critical(&value);
109    if ((ext_type = v3_check_generic(&value)))
110        return v3_generic_extension(OBJ_nid2sn(ext_nid),
111                                    value, crit, ext_type, ctx);
112    return do_ext_nconf(conf, ctx, ext_nid, crit, value);
113}
114
115/* CONF *conf:  Config file    */
116/* char *value:  Value    */
117static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid,
118                                    int crit, char *value)
119{
120    const X509V3_EXT_METHOD *method;
121    X509_EXTENSION *ext;
122    STACK_OF(CONF_VALUE) *nval;
123    void *ext_struc;
124    if (ext_nid == NID_undef) {
125        X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_UNKNOWN_EXTENSION_NAME);
126        return NULL;
127    }
128    if (!(method = X509V3_EXT_get_nid(ext_nid))) {
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        if (*value == '@')
135            nval = NCONF_get_section(conf, value + 1);
136        else
137            nval = X509V3_parse_list(value);
138        if (nval == NULL || sk_CONF_VALUE_num(nval) <= 0) {
139            X509V3err(X509V3_F_DO_EXT_NCONF,
140                      X509V3_R_INVALID_EXTENSION_STRING);
141            ERR_add_error_data(4, "name=", OBJ_nid2sn(ext_nid), ",section=",
142                               value);
143            if (*value != '@')
144                sk_CONF_VALUE_free(nval);
145            return NULL;
146        }
147        ext_struc = method->v2i(method, ctx, nval);
148        if (*value != '@')
149            sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);
150        if (!ext_struc)
151            return NULL;
152    } else if (method->s2i) {
153        if (!(ext_struc = method->s2i(method, ctx, value)))
154            return NULL;
155    } else if (method->r2i) {
156        if (!ctx->db || !ctx->db_meth) {
157            X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_NO_CONFIG_DATABASE);
158            return NULL;
159        }
160        if (!(ext_struc = method->r2i(method, ctx, value)))
161            return NULL;
162    } else {
163        X509V3err(X509V3_F_DO_EXT_NCONF,
164                  X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED);
165        ERR_add_error_data(2, "name=", OBJ_nid2sn(ext_nid));
166        return NULL;
167    }
168
169    ext = do_ext_i2d(method, ext_nid, crit, ext_struc);
170    if (method->it)
171        ASN1_item_free(ext_struc, ASN1_ITEM_ptr(method->it));
172    else
173        method->ext_free(ext_struc);
174    return ext;
175
176}
177
178static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method,
179                                  int ext_nid, int crit, void *ext_struc)
180{
181    unsigned char *ext_der;
182    int ext_len;
183    ASN1_OCTET_STRING *ext_oct;
184    X509_EXTENSION *ext;
185    /* Convert internal representation to DER */
186    if (method->it) {
187        ext_der = NULL;
188        ext_len =
189            ASN1_item_i2d(ext_struc, &ext_der, ASN1_ITEM_ptr(method->it));
190        if (ext_len < 0)
191            goto merr;
192    } else {
193        unsigned char *p;
194        ext_len = method->i2d(ext_struc, NULL);
195        if (!(ext_der = OPENSSL_malloc(ext_len)))
196            goto merr;
197        p = ext_der;
198        method->i2d(ext_struc, &p);
199    }
200    if (!(ext_oct = M_ASN1_OCTET_STRING_new()))
201        goto merr;
202    ext_oct->data = ext_der;
203    ext_oct->length = ext_len;
204
205    ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct);
206    if (!ext)
207        goto merr;
208    M_ASN1_OCTET_STRING_free(ext_oct);
209
210    return ext;
211
212 merr:
213    X509V3err(X509V3_F_DO_EXT_I2D, ERR_R_MALLOC_FAILURE);
214    return NULL;
215
216}
217
218/* Given an internal structure, nid and critical flag create an extension */
219
220X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc)
221{
222    const X509V3_EXT_METHOD *method;
223    if (!(method = X509V3_EXT_get_nid(ext_nid))) {
224        X509V3err(X509V3_F_X509V3_EXT_I2D, X509V3_R_UNKNOWN_EXTENSION);
225        return NULL;
226    }
227    return do_ext_i2d(method, ext_nid, crit, ext_struc);
228}
229
230/* Check the extension string for critical flag */
231static int v3_check_critical(char **value)
232{
233    char *p = *value;
234    if ((strlen(p) < 9) || strncmp(p, "critical,", 9))
235        return 0;
236    p += 9;
237    while (isspace((unsigned char)*p))
238        p++;
239    *value = p;
240    return 1;
241}
242
243/* Check extension string for generic extension and return the type */
244static int v3_check_generic(char **value)
245{
246    int gen_type = 0;
247    char *p = *value;
248    if ((strlen(p) >= 4) && !strncmp(p, "DER:", 4)) {
249        p += 4;
250        gen_type = 1;
251    } else if ((strlen(p) >= 5) && !strncmp(p, "ASN1:", 5)) {
252        p += 5;
253        gen_type = 2;
254    } else
255        return 0;
256
257    while (isspace((unsigned char)*p))
258        p++;
259    *value = p;
260    return gen_type;
261}
262
263/* Create a generic extension: for now just handle DER type */
264static X509_EXTENSION *v3_generic_extension(const char *ext, char *value,
265                                            int crit, int gen_type,
266                                            X509V3_CTX *ctx)
267{
268    unsigned char *ext_der = NULL;
269    long ext_len;
270    ASN1_OBJECT *obj = NULL;
271    ASN1_OCTET_STRING *oct = NULL;
272    X509_EXTENSION *extension = NULL;
273    if (!(obj = OBJ_txt2obj(ext, 0))) {
274        X509V3err(X509V3_F_V3_GENERIC_EXTENSION,
275                  X509V3_R_EXTENSION_NAME_ERROR);
276        ERR_add_error_data(2, "name=", ext);
277        goto err;
278    }
279
280    if (gen_type == 1)
281        ext_der = string_to_hex(value, &ext_len);
282    else if (gen_type == 2)
283        ext_der = generic_asn1(value, ctx, &ext_len);
284
285    if (ext_der == NULL) {
286        X509V3err(X509V3_F_V3_GENERIC_EXTENSION,
287                  X509V3_R_EXTENSION_VALUE_ERROR);
288        ERR_add_error_data(2, "value=", value);
289        goto err;
290    }
291
292    if (!(oct = M_ASN1_OCTET_STRING_new())) {
293        X509V3err(X509V3_F_V3_GENERIC_EXTENSION, ERR_R_MALLOC_FAILURE);
294        goto err;
295    }
296
297    oct->data = ext_der;
298    oct->length = ext_len;
299    ext_der = NULL;
300
301    extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct);
302
303 err:
304    ASN1_OBJECT_free(obj);
305    M_ASN1_OCTET_STRING_free(oct);
306    if (ext_der)
307        OPENSSL_free(ext_der);
308    return extension;
309
310}
311
312static unsigned char *generic_asn1(char *value, X509V3_CTX *ctx,
313                                   long *ext_len)
314{
315    ASN1_TYPE *typ;
316    unsigned char *ext_der = NULL;
317    typ = ASN1_generate_v3(value, ctx);
318    if (typ == NULL)
319        return NULL;
320    *ext_len = i2d_ASN1_TYPE(typ, &ext_der);
321    ASN1_TYPE_free(typ);
322    return ext_der;
323}
324
325/*
326 * This is the main function: add a bunch of extensions based on a config
327 * file section to an extension STACK.
328 */
329
330int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, char *section,
331                            STACK_OF(X509_EXTENSION) **sk)
332{
333    X509_EXTENSION *ext;
334    STACK_OF(CONF_VALUE) *nval;
335    CONF_VALUE *val;
336    int i;
337    if (!(nval = NCONF_get_section(conf, section)))
338        return 0;
339    for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
340        val = sk_CONF_VALUE_value(nval, i);
341        if (!(ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value)))
342            return 0;
343        if (sk != NULL) {
344            if (X509v3_add_ext(sk, ext, -1) == NULL) {
345                X509_EXTENSION_free(ext);
346                return 0;
347            }
348        }
349        X509_EXTENSION_free(ext);
350    }
351    return 1;
352}
353
354/*
355 * Convenience functions to add extensions to a certificate, CRL and request
356 */
357
358int X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
359                         X509 *cert)
360{
361    STACK_OF(X509_EXTENSION) **sk = NULL;
362    if (cert)
363        sk = &cert->cert_info->extensions;
364    return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
365}
366
367/* Same as above but for a CRL */
368
369int X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
370                             X509_CRL *crl)
371{
372    STACK_OF(X509_EXTENSION) **sk = NULL;
373    if (crl)
374        sk = &crl->crl->extensions;
375    return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
376}
377
378/* Add extensions to certificate request */
379
380int X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
381                             X509_REQ *req)
382{
383    STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL;
384    int i;
385    if (req)
386        sk = &extlist;
387    i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
388    if (!i || !sk)
389        return i;
390    i = X509_REQ_add_extensions(req, extlist);
391    sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free);
392    return i;
393}
394
395/* Config database functions */
396
397char *X509V3_get_string(X509V3_CTX *ctx, char *name, char *section)
398{
399    if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string) {
400        X509V3err(X509V3_F_X509V3_GET_STRING, X509V3_R_OPERATION_NOT_DEFINED);
401        return NULL;
402    }
403    if (ctx->db_meth->get_string)
404        return ctx->db_meth->get_string(ctx->db, name, section);
405    return NULL;
406}
407
408STACK_OF(CONF_VALUE) *X509V3_get_section(X509V3_CTX *ctx, char *section)
409{
410    if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section) {
411        X509V3err(X509V3_F_X509V3_GET_SECTION,
412                  X509V3_R_OPERATION_NOT_DEFINED);
413        return NULL;
414    }
415    if (ctx->db_meth->get_section)
416        return ctx->db_meth->get_section(ctx->db, section);
417    return NULL;
418}
419
420void X509V3_string_free(X509V3_CTX *ctx, char *str)
421{
422    if (!str)
423        return;
424    if (ctx->db_meth->free_string)
425        ctx->db_meth->free_string(ctx->db, str);
426}
427
428void X509V3_section_free(X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *section)
429{
430    if (!section)
431        return;
432    if (ctx->db_meth->free_section)
433        ctx->db_meth->free_section(ctx->db, section);
434}
435
436static char *nconf_get_string(void *db, char *section, char *value)
437{
438    return NCONF_get_string(db, section, value);
439}
440
441static STACK_OF(CONF_VALUE) *nconf_get_section(void *db, char *section)
442{
443    return NCONF_get_section(db, section);
444}
445
446static X509V3_CONF_METHOD nconf_method = {
447    nconf_get_string,
448    nconf_get_section,
449    NULL,
450    NULL
451};
452
453void X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf)
454{
455    ctx->db_meth = &nconf_method;
456    ctx->db = conf;
457}
458
459void X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req,
460                    X509_CRL *crl, int flags)
461{
462    ctx->issuer_cert = issuer;
463    ctx->subject_cert = subj;
464    ctx->crl = crl;
465    ctx->subject_req = req;
466    ctx->flags = flags;
467}
468
469/* Old conf compatibility functions */
470
471X509_EXTENSION *X509V3_EXT_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
472                                char *name, char *value)
473{
474    CONF ctmp;
475    CONF_set_nconf(&ctmp, conf);
476    return X509V3_EXT_nconf(&ctmp, ctx, name, value);
477}
478
479/* LHASH *conf:  Config file    */
480/* char *value:  Value    */
481X509_EXTENSION *X509V3_EXT_conf_nid(LHASH_OF(CONF_VALUE) *conf,
482                                    X509V3_CTX *ctx, int ext_nid, char *value)
483{
484    CONF ctmp;
485    CONF_set_nconf(&ctmp, conf);
486    return X509V3_EXT_nconf_nid(&ctmp, ctx, ext_nid, value);
487}
488
489static char *conf_lhash_get_string(void *db, char *section, char *value)
490{
491    return CONF_get_string(db, section, value);
492}
493
494static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, char *section)
495{
496    return CONF_get_section(db, section);
497}
498
499static X509V3_CONF_METHOD conf_lhash_method = {
500    conf_lhash_get_string,
501    conf_lhash_get_section,
502    NULL,
503    NULL
504};
505
506void X509V3_set_conf_lhash(X509V3_CTX *ctx, LHASH_OF(CONF_VALUE) *lhash)
507{
508    ctx->db_meth = &conf_lhash_method;
509    ctx->db = lhash;
510}
511
512int X509V3_EXT_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
513                        char *section, X509 *cert)
514{
515    CONF ctmp;
516    CONF_set_nconf(&ctmp, conf);
517    return X509V3_EXT_add_nconf(&ctmp, ctx, section, cert);
518}
519
520/* Same as above but for a CRL */
521
522int X509V3_EXT_CRL_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
523                            char *section, X509_CRL *crl)
524{
525    CONF ctmp;
526    CONF_set_nconf(&ctmp, conf);
527    return X509V3_EXT_CRL_add_nconf(&ctmp, ctx, section, crl);
528}
529
530/* Add extensions to certificate request */
531
532int X509V3_EXT_REQ_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
533                            char *section, X509_REQ *req)
534{
535    CONF ctmp;
536    CONF_set_nconf(&ctmp, conf);
537    return X509V3_EXT_REQ_add_nconf(&ctmp, ctx, section, req);
538}
539