v3_conf.c revision 296465 
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) 1999-2002 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(X509V3_EXT_METHOD *method, int ext_nid,
78                                  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    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 (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            return NULL;
144        }
145        ext_struc = method->v2i(method, ctx, nval);
146        if (*value != '@')
147            sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);
148        if (!ext_struc)
149            return NULL;
150    } else if (method->s2i) {
151        if (!(ext_struc = method->s2i(method, ctx, value)))
152            return NULL;
153    } else if (method->r2i) {
154        if (!ctx->db || !ctx->db_meth) {
155            X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_NO_CONFIG_DATABASE);
156            return NULL;
157        }
158        if (!(ext_struc = method->r2i(method, ctx, value)))
159            return NULL;
160    } else {
161        X509V3err(X509V3_F_DO_EXT_NCONF,
162                  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)
169        ASN1_item_free(ext_struc, ASN1_ITEM_ptr(method->it));
170    else
171        method->ext_free(ext_struc);
172    return ext;
173
174}
175
176static X509_EXTENSION *do_ext_i2d(X509V3_EXT_METHOD *method, int ext_nid,
177                                  int crit, void *ext_struc)
178{
179    unsigned char *ext_der;
180    int ext_len;
181    ASN1_OCTET_STRING *ext_oct;
182    X509_EXTENSION *ext;
183    /* Convert internal representation to DER */
184    if (method->it) {
185        ext_der = NULL;
186        ext_len =
187            ASN1_item_i2d(ext_struc, &ext_der, ASN1_ITEM_ptr(method->it));
188        if (ext_len < 0)
189            goto merr;
190    } else {
191        unsigned char *p;
192        ext_len = method->i2d(ext_struc, NULL);
193        if (!(ext_der = OPENSSL_malloc(ext_len)))
194            goto merr;
195        p = ext_der;
196        method->i2d(ext_struc, &p);
197    }
198    if (!(ext_oct = M_ASN1_OCTET_STRING_new()))
199        goto merr;
200    ext_oct->data = ext_der;
201    ext_oct->length = ext_len;
202
203    ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct);
204    if (!ext)
205        goto merr;
206    M_ASN1_OCTET_STRING_free(ext_oct);
207
208    return ext;
209
210 merr:
211    X509V3err(X509V3_F_DO_EXT_I2D, ERR_R_MALLOC_FAILURE);
212    return NULL;
213
214}
215
216/* Given an internal structure, nid and critical flag create an extension */
217
218X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc)
219{
220    X509V3_EXT_METHOD *method;
221    if (!(method = X509V3_EXT_get_nid(ext_nid))) {
222        X509V3err(X509V3_F_X509V3_EXT_I2D, X509V3_R_UNKNOWN_EXTENSION);
223        return NULL;
224    }
225    return do_ext_i2d(method, ext_nid, crit, ext_struc);
226}
227
228/* Check the extension string for critical flag */
229static int v3_check_critical(char **value)
230{
231    char *p = *value;
232    if ((strlen(p) < 9) || strncmp(p, "critical,", 9))
233        return 0;
234    p += 9;
235    while (isspace((unsigned char)*p))
236        p++;
237    *value = p;
238    return 1;
239}
240
241/* Check extension string for generic extension and return the type */
242static int v3_check_generic(char **value)
243{
244    int gen_type = 0;
245    char *p = *value;
246    if ((strlen(p) >= 4) && !strncmp(p, "DER:", 4)) {
247        p += 4;
248        gen_type = 1;
249    } else if ((strlen(p) >= 5) && !strncmp(p, "ASN1:", 5)) {
250        p += 5;
251        gen_type = 2;
252    } else
253        return 0;
254
255    while (isspace((unsigned char)*p))
256        p++;
257    *value = p;
258    return gen_type;
259}
260
261/* Create a generic extension: for now just handle DER type */
262static X509_EXTENSION *v3_generic_extension(const char *ext, char *value,
263                                            int crit, int gen_type,
264                                            X509V3_CTX *ctx)
265{
266    unsigned char *ext_der = NULL;
267    long ext_len;
268    ASN1_OBJECT *obj = NULL;
269    ASN1_OCTET_STRING *oct = NULL;
270    X509_EXTENSION *extension = NULL;
271    if (!(obj = OBJ_txt2obj(ext, 0))) {
272        X509V3err(X509V3_F_V3_GENERIC_EXTENSION,
273                  X509V3_R_EXTENSION_NAME_ERROR);
274        ERR_add_error_data(2, "name=", ext);
275        goto err;
276    }
277
278    if (gen_type == 1)
279        ext_der = string_to_hex(value, &ext_len);
280    else if (gen_type == 2)
281        ext_der = generic_asn1(value, ctx, &ext_len);
282
283    if (ext_der == NULL) {
284        X509V3err(X509V3_F_V3_GENERIC_EXTENSION,
285                  X509V3_R_EXTENSION_VALUE_ERROR);
286        ERR_add_error_data(2, "value=", value);
287        goto err;
288    }
289
290    if (!(oct = M_ASN1_OCTET_STRING_new())) {
291        X509V3err(X509V3_F_V3_GENERIC_EXTENSION, ERR_R_MALLOC_FAILURE);
292        goto err;
293    }
294
295    oct->data = ext_der;
296    oct->length = ext_len;
297    ext_der = NULL;
298
299    extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct);
300
301 err:
302    ASN1_OBJECT_free(obj);
303    M_ASN1_OCTET_STRING_free(oct);
304    if (ext_der)
305        OPENSSL_free(ext_der);
306    return extension;
307
308}
309
310static unsigned char *generic_asn1(char *value, X509V3_CTX *ctx,
311                                   long *ext_len)
312{
313    ASN1_TYPE *typ;
314    unsigned char *ext_der = NULL;
315    typ = ASN1_generate_v3(value, ctx);
316    if (typ == NULL)
317        return NULL;
318    *ext_len = i2d_ASN1_TYPE(typ, &ext_der);
319    ASN1_TYPE_free(typ);
320    return ext_der;
321}
322
323/*
324 * This is the main function: add a bunch of extensions based on a config
325 * file section to an extension STACK.
326 */
327
328int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, char *section,
329                            STACK_OF(X509_EXTENSION) **sk)
330{
331    X509_EXTENSION *ext;
332    STACK_OF(CONF_VALUE) *nval;
333    CONF_VALUE *val;
334    int i;
335    if (!(nval = NCONF_get_section(conf, section)))
336        return 0;
337    for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
338        val = sk_CONF_VALUE_value(nval, i);
339        if (!(ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value)))
340            return 0;
341        if (sk)
342            X509v3_add_ext(sk, ext, -1);
343        X509_EXTENSION_free(ext);
344    }
345    return 1;
346}
347
348/*
349 * Convenience functions to add extensions to a certificate, CRL and request
350 */
351
352int X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
353                         X509 *cert)
354{
355    STACK_OF(X509_EXTENSION) **sk = NULL;
356    if (cert)
357        sk = &cert->cert_info->extensions;
358    return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
359}
360
361/* Same as above but for a CRL */
362
363int X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
364                             X509_CRL *crl)
365{
366    STACK_OF(X509_EXTENSION) **sk = NULL;
367    if (crl)
368        sk = &crl->crl->extensions;
369    return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
370}
371
372/* Add extensions to certificate request */
373
374int X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
375                             X509_REQ *req)
376{
377    STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL;
378    int i;
379    if (req)
380        sk = &extlist;
381    i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
382    if (!i || !sk)
383        return i;
384    i = X509_REQ_add_extensions(req, extlist);
385    sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free);
386    return i;
387}
388
389/* Config database functions */
390
391char *X509V3_get_string(X509V3_CTX *ctx, char *name, char *section)
392{
393    if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string) {
394        X509V3err(X509V3_F_X509V3_GET_STRING, X509V3_R_OPERATION_NOT_DEFINED);
395        return NULL;
396    }
397    if (ctx->db_meth->get_string)
398        return ctx->db_meth->get_string(ctx->db, name, section);
399    return NULL;
400}
401
402STACK_OF(CONF_VALUE) *X509V3_get_section(X509V3_CTX *ctx, char *section)
403{
404    if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section) {
405        X509V3err(X509V3_F_X509V3_GET_SECTION,
406                  X509V3_R_OPERATION_NOT_DEFINED);
407        return NULL;
408    }
409    if (ctx->db_meth->get_section)
410        return ctx->db_meth->get_section(ctx->db, section);
411    return NULL;
412}
413
414void X509V3_string_free(X509V3_CTX *ctx, char *str)
415{
416    if (!str)
417        return;
418    if (ctx->db_meth->free_string)
419        ctx->db_meth->free_string(ctx->db, str);
420}
421
422void X509V3_section_free(X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *section)
423{
424    if (!section)
425        return;
426    if (ctx->db_meth->free_section)
427        ctx->db_meth->free_section(ctx->db, section);
428}
429
430static char *nconf_get_string(void *db, char *section, char *value)
431{
432    return NCONF_get_string(db, section, value);
433}
434
435static STACK_OF(CONF_VALUE) *nconf_get_section(void *db, char *section)
436{
437    return NCONF_get_section(db, section);
438}
439
440static X509V3_CONF_METHOD nconf_method = {
441    nconf_get_string,
442    nconf_get_section,
443    NULL,
444    NULL
445};
446
447void X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf)
448{
449    ctx->db_meth = &nconf_method;
450    ctx->db = conf;
451}
452
453void X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req,
454                    X509_CRL *crl, int flags)
455{
456    ctx->issuer_cert = issuer;
457    ctx->subject_cert = subj;
458    ctx->crl = crl;
459    ctx->subject_req = req;
460    ctx->flags = flags;
461}
462
463/* Old conf compatibility functions */
464
465X509_EXTENSION *X509V3_EXT_conf(LHASH *conf, X509V3_CTX *ctx, char *name,
466                                char *value)
467{
468    CONF ctmp;
469    CONF_set_nconf(&ctmp, conf);
470    return X509V3_EXT_nconf(&ctmp, ctx, name, value);
471}
472
473/* LHASH *conf:  Config file    */
474/* char *value:  Value    */
475X509_EXTENSION *X509V3_EXT_conf_nid(LHASH *conf, X509V3_CTX *ctx, int ext_nid,
476                                    char *value)
477{
478    CONF ctmp;
479    CONF_set_nconf(&ctmp, conf);
480    return X509V3_EXT_nconf_nid(&ctmp, ctx, ext_nid, value);
481}
482
483static char *conf_lhash_get_string(void *db, char *section, char *value)
484{
485    return CONF_get_string(db, section, value);
486}
487
488static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, char *section)
489{
490    return CONF_get_section(db, section);
491}
492
493static X509V3_CONF_METHOD conf_lhash_method = {
494    conf_lhash_get_string,
495    conf_lhash_get_section,
496    NULL,
497    NULL
498};
499
500void X509V3_set_conf_lhash(X509V3_CTX *ctx, LHASH *lhash)
501{
502    ctx->db_meth = &conf_lhash_method;
503    ctx->db = lhash;
504}
505
506int X509V3_EXT_add_conf(LHASH *conf, X509V3_CTX *ctx, char *section,
507                        X509 *cert)
508{
509    CONF ctmp;
510    CONF_set_nconf(&ctmp, conf);
511    return X509V3_EXT_add_nconf(&ctmp, ctx, section, cert);
512}
513
514/* Same as above but for a CRL */
515
516int X509V3_EXT_CRL_add_conf(LHASH *conf, X509V3_CTX *ctx, char *section,
517                            X509_CRL *crl)
518{
519    CONF ctmp;
520    CONF_set_nconf(&ctmp, conf);
521    return X509V3_EXT_CRL_add_nconf(&ctmp, ctx, section, crl);
522}
523
524/* Add extensions to certificate request */
525
526int X509V3_EXT_REQ_add_conf(LHASH *conf, X509V3_CTX *ctx, char *section,
527                            X509_REQ *req)
528{
529    CONF ctmp;
530    CONF_set_nconf(&ctmp, conf);
531    return X509V3_EXT_REQ_add_nconf(&ctmp, ctx, section, req);
532}
533