ocsp_ext.c revision 296465 
1/* ocsp_ext.c */
2/*
3 * Written by Tom Titchener <Tom_Titchener@groove.net> for the OpenSSL
4 * project.
5 */
6
7/*
8 * History: This file was transfered to Richard Levitte from CertCo by Kathy
9 * Weinhold in mid-spring 2000 to be included in OpenSSL or released as a
10 * patch kit.
11 */
12
13/* ====================================================================
14 * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 *
20 * 1. Redistributions of source code must retain the above copyright
21 *    notice, this list of conditions and the following disclaimer.
22 *
23 * 2. Redistributions in binary form must reproduce the above copyright
24 *    notice, this list of conditions and the following disclaimer in
25 *    the documentation and/or other materials provided with the
26 *    distribution.
27 *
28 * 3. All advertising materials mentioning features or use of this
29 *    software must display the following acknowledgment:
30 *    "This product includes software developed by the OpenSSL Project
31 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
32 *
33 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
34 *    endorse or promote products derived from this software without
35 *    prior written permission. For written permission, please contact
36 *    openssl-core@openssl.org.
37 *
38 * 5. Products derived from this software may not be called "OpenSSL"
39 *    nor may "OpenSSL" appear in their names without prior written
40 *    permission of the OpenSSL Project.
41 *
42 * 6. Redistributions of any form whatsoever must retain the following
43 *    acknowledgment:
44 *    "This product includes software developed by the OpenSSL Project
45 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
46 *
47 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
48 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
50 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
51 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
52 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
53 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
54 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
56 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
57 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
58 * OF THE POSSIBILITY OF SUCH DAMAGE.
59 * ====================================================================
60 *
61 * This product includes cryptographic software written by Eric Young
62 * (eay@cryptsoft.com).  This product includes software written by Tim
63 * Hudson (tjh@cryptsoft.com).
64 *
65 */
66
67#include <stdio.h>
68#include <cryptlib.h>
69#include <openssl/objects.h>
70#include <openssl/x509.h>
71#include <openssl/ocsp.h>
72#include <openssl/rand.h>
73#include <openssl/x509v3.h>
74
75/* Standard wrapper functions for extensions */
76
77/* OCSP request extensions */
78
79int OCSP_REQUEST_get_ext_count(OCSP_REQUEST *x)
80{
81    return (X509v3_get_ext_count(x->tbsRequest->requestExtensions));
82}
83
84int OCSP_REQUEST_get_ext_by_NID(OCSP_REQUEST *x, int nid, int lastpos)
85{
86    return (X509v3_get_ext_by_NID
87            (x->tbsRequest->requestExtensions, nid, lastpos));
88}
89
90int OCSP_REQUEST_get_ext_by_OBJ(OCSP_REQUEST *x, ASN1_OBJECT *obj,
91                                int lastpos)
92{
93    return (X509v3_get_ext_by_OBJ
94            (x->tbsRequest->requestExtensions, obj, lastpos));
95}
96
97int OCSP_REQUEST_get_ext_by_critical(OCSP_REQUEST *x, int crit, int lastpos)
98{
99    return (X509v3_get_ext_by_critical
100            (x->tbsRequest->requestExtensions, crit, lastpos));
101}
102
103X509_EXTENSION *OCSP_REQUEST_get_ext(OCSP_REQUEST *x, int loc)
104{
105    return (X509v3_get_ext(x->tbsRequest->requestExtensions, loc));
106}
107
108X509_EXTENSION *OCSP_REQUEST_delete_ext(OCSP_REQUEST *x, int loc)
109{
110    return (X509v3_delete_ext(x->tbsRequest->requestExtensions, loc));
111}
112
113void *OCSP_REQUEST_get1_ext_d2i(OCSP_REQUEST *x, int nid, int *crit, int *idx)
114{
115    return X509V3_get_d2i(x->tbsRequest->requestExtensions, nid, crit, idx);
116}
117
118int OCSP_REQUEST_add1_ext_i2d(OCSP_REQUEST *x, int nid, void *value, int crit,
119                              unsigned long flags)
120{
121    return X509V3_add1_i2d(&x->tbsRequest->requestExtensions, nid, value,
122                           crit, flags);
123}
124
125int OCSP_REQUEST_add_ext(OCSP_REQUEST *x, X509_EXTENSION *ex, int loc)
126{
127    return (X509v3_add_ext(&(x->tbsRequest->requestExtensions), ex, loc) !=
128            NULL);
129}
130
131/* Single extensions */
132
133int OCSP_ONEREQ_get_ext_count(OCSP_ONEREQ *x)
134{
135    return (X509v3_get_ext_count(x->singleRequestExtensions));
136}
137
138int OCSP_ONEREQ_get_ext_by_NID(OCSP_ONEREQ *x, int nid, int lastpos)
139{
140    return (X509v3_get_ext_by_NID(x->singleRequestExtensions, nid, lastpos));
141}
142
143int OCSP_ONEREQ_get_ext_by_OBJ(OCSP_ONEREQ *x, ASN1_OBJECT *obj, int lastpos)
144{
145    return (X509v3_get_ext_by_OBJ(x->singleRequestExtensions, obj, lastpos));
146}
147
148int OCSP_ONEREQ_get_ext_by_critical(OCSP_ONEREQ *x, int crit, int lastpos)
149{
150    return (X509v3_get_ext_by_critical
151            (x->singleRequestExtensions, crit, lastpos));
152}
153
154X509_EXTENSION *OCSP_ONEREQ_get_ext(OCSP_ONEREQ *x, int loc)
155{
156    return (X509v3_get_ext(x->singleRequestExtensions, loc));
157}
158
159X509_EXTENSION *OCSP_ONEREQ_delete_ext(OCSP_ONEREQ *x, int loc)
160{
161    return (X509v3_delete_ext(x->singleRequestExtensions, loc));
162}
163
164void *OCSP_ONEREQ_get1_ext_d2i(OCSP_ONEREQ *x, int nid, int *crit, int *idx)
165{
166    return X509V3_get_d2i(x->singleRequestExtensions, nid, crit, idx);
167}
168
169int OCSP_ONEREQ_add1_ext_i2d(OCSP_ONEREQ *x, int nid, void *value, int crit,
170                             unsigned long flags)
171{
172    return X509V3_add1_i2d(&x->singleRequestExtensions, nid, value, crit,
173                           flags);
174}
175
176int OCSP_ONEREQ_add_ext(OCSP_ONEREQ *x, X509_EXTENSION *ex, int loc)
177{
178    return (X509v3_add_ext(&(x->singleRequestExtensions), ex, loc) != NULL);
179}
180
181/* OCSP Basic response */
182
183int OCSP_BASICRESP_get_ext_count(OCSP_BASICRESP *x)
184{
185    return (X509v3_get_ext_count(x->tbsResponseData->responseExtensions));
186}
187
188int OCSP_BASICRESP_get_ext_by_NID(OCSP_BASICRESP *x, int nid, int lastpos)
189{
190    return (X509v3_get_ext_by_NID
191            (x->tbsResponseData->responseExtensions, nid, lastpos));
192}
193
194int OCSP_BASICRESP_get_ext_by_OBJ(OCSP_BASICRESP *x, ASN1_OBJECT *obj,
195                                  int lastpos)
196{
197    return (X509v3_get_ext_by_OBJ
198            (x->tbsResponseData->responseExtensions, obj, lastpos));
199}
200
201int OCSP_BASICRESP_get_ext_by_critical(OCSP_BASICRESP *x, int crit,
202                                       int lastpos)
203{
204    return (X509v3_get_ext_by_critical
205            (x->tbsResponseData->responseExtensions, crit, lastpos));
206}
207
208X509_EXTENSION *OCSP_BASICRESP_get_ext(OCSP_BASICRESP *x, int loc)
209{
210    return (X509v3_get_ext(x->tbsResponseData->responseExtensions, loc));
211}
212
213X509_EXTENSION *OCSP_BASICRESP_delete_ext(OCSP_BASICRESP *x, int loc)
214{
215    return (X509v3_delete_ext(x->tbsResponseData->responseExtensions, loc));
216}
217
218void *OCSP_BASICRESP_get1_ext_d2i(OCSP_BASICRESP *x, int nid, int *crit,
219                                  int *idx)
220{
221    return X509V3_get_d2i(x->tbsResponseData->responseExtensions, nid, crit,
222                          idx);
223}
224
225int OCSP_BASICRESP_add1_ext_i2d(OCSP_BASICRESP *x, int nid, void *value,
226                                int crit, unsigned long flags)
227{
228    return X509V3_add1_i2d(&x->tbsResponseData->responseExtensions, nid,
229                           value, crit, flags);
230}
231
232int OCSP_BASICRESP_add_ext(OCSP_BASICRESP *x, X509_EXTENSION *ex, int loc)
233{
234    return (X509v3_add_ext(&(x->tbsResponseData->responseExtensions), ex, loc)
235            != NULL);
236}
237
238/* OCSP single response extensions */
239
240int OCSP_SINGLERESP_get_ext_count(OCSP_SINGLERESP *x)
241{
242    return (X509v3_get_ext_count(x->singleExtensions));
243}
244
245int OCSP_SINGLERESP_get_ext_by_NID(OCSP_SINGLERESP *x, int nid, int lastpos)
246{
247    return (X509v3_get_ext_by_NID(x->singleExtensions, nid, lastpos));
248}
249
250int OCSP_SINGLERESP_get_ext_by_OBJ(OCSP_SINGLERESP *x, ASN1_OBJECT *obj,
251                                   int lastpos)
252{
253    return (X509v3_get_ext_by_OBJ(x->singleExtensions, obj, lastpos));
254}
255
256int OCSP_SINGLERESP_get_ext_by_critical(OCSP_SINGLERESP *x, int crit,
257                                        int lastpos)
258{
259    return (X509v3_get_ext_by_critical(x->singleExtensions, crit, lastpos));
260}
261
262X509_EXTENSION *OCSP_SINGLERESP_get_ext(OCSP_SINGLERESP *x, int loc)
263{
264    return (X509v3_get_ext(x->singleExtensions, loc));
265}
266
267X509_EXTENSION *OCSP_SINGLERESP_delete_ext(OCSP_SINGLERESP *x, int loc)
268{
269    return (X509v3_delete_ext(x->singleExtensions, loc));
270}
271
272void *OCSP_SINGLERESP_get1_ext_d2i(OCSP_SINGLERESP *x, int nid, int *crit,
273                                   int *idx)
274{
275    return X509V3_get_d2i(x->singleExtensions, nid, crit, idx);
276}
277
278int OCSP_SINGLERESP_add1_ext_i2d(OCSP_SINGLERESP *x, int nid, void *value,
279                                 int crit, unsigned long flags)
280{
281    return X509V3_add1_i2d(&x->singleExtensions, nid, value, crit, flags);
282}
283
284int OCSP_SINGLERESP_add_ext(OCSP_SINGLERESP *x, X509_EXTENSION *ex, int loc)
285{
286    return (X509v3_add_ext(&(x->singleExtensions), ex, loc) != NULL);
287}
288
289/* also CRL Entry Extensions */
290
291ASN1_STRING *ASN1_STRING_encode(ASN1_STRING *s, i2d_of_void *i2d,
292                                void *data, STACK_OF(ASN1_OBJECT) *sk)
293{
294    int i;
295    unsigned char *p, *b = NULL;
296
297    if (data) {
298        if ((i = i2d(data, NULL)) <= 0)
299            goto err;
300        if (!(b = p = OPENSSL_malloc((unsigned int)i)))
301            goto err;
302        if (i2d(data, &p) <= 0)
303            goto err;
304    } else if (sk) {
305        if ((i = i2d_ASN1_SET_OF_ASN1_OBJECT(sk, NULL,
306                                             (I2D_OF(ASN1_OBJECT)) i2d,
307                                             V_ASN1_SEQUENCE,
308                                             V_ASN1_UNIVERSAL,
309                                             IS_SEQUENCE)) <= 0)
310             goto err;
311        if (!(b = p = OPENSSL_malloc((unsigned int)i)))
312            goto err;
313        if (i2d_ASN1_SET_OF_ASN1_OBJECT(sk, &p, (I2D_OF(ASN1_OBJECT)) i2d,
314                                        V_ASN1_SEQUENCE,
315                                        V_ASN1_UNIVERSAL, IS_SEQUENCE) <= 0)
316             goto err;
317    } else {
318        OCSPerr(OCSP_F_ASN1_STRING_ENCODE, OCSP_R_BAD_DATA);
319        goto err;
320    }
321    if (!s && !(s = ASN1_STRING_new()))
322        goto err;
323    if (!(ASN1_STRING_set(s, b, i)))
324        goto err;
325    OPENSSL_free(b);
326    return s;
327 err:
328    if (b)
329        OPENSSL_free(b);
330    return NULL;
331}
332
333/* Nonce handling functions */
334
335/*
336 * Add a nonce to an extension stack. A nonce can be specificed or if NULL a
337 * random nonce will be generated. Note: OpenSSL 0.9.7d and later create an
338 * OCTET STRING containing the nonce, previous versions used the raw nonce.
339 */
340
341static int ocsp_add1_nonce(STACK_OF(X509_EXTENSION) **exts,
342                           unsigned char *val, int len)
343{
344    unsigned char *tmpval;
345    ASN1_OCTET_STRING os;
346    int ret = 0;
347    if (len <= 0)
348        len = OCSP_DEFAULT_NONCE_LENGTH;
349    /*
350     * Create the OCTET STRING manually by writing out the header and
351     * appending the content octets. This avoids an extra memory allocation
352     * operation in some cases. Applications should *NOT* do this because it
353     * relies on library internals.
354     */
355    os.length = ASN1_object_size(0, len, V_ASN1_OCTET_STRING);
356    os.data = OPENSSL_malloc(os.length);
357    if (os.data == NULL)
358        goto err;
359    tmpval = os.data;
360    ASN1_put_object(&tmpval, 0, len, V_ASN1_OCTET_STRING, V_ASN1_UNIVERSAL);
361    if (val)
362        memcpy(tmpval, val, len);
363    else
364        RAND_pseudo_bytes(tmpval, len);
365    if (!X509V3_add1_i2d(exts, NID_id_pkix_OCSP_Nonce,
366                         &os, 0, X509V3_ADD_REPLACE))
367        goto err;
368    ret = 1;
369 err:
370    if (os.data)
371        OPENSSL_free(os.data);
372    return ret;
373}
374
375/* Add nonce to an OCSP request */
376
377int OCSP_request_add1_nonce(OCSP_REQUEST *req, unsigned char *val, int len)
378{
379    return ocsp_add1_nonce(&req->tbsRequest->requestExtensions, val, len);
380}
381
382/* Same as above but for a response */
383
384int OCSP_basic_add1_nonce(OCSP_BASICRESP *resp, unsigned char *val, int len)
385{
386    return ocsp_add1_nonce(&resp->tbsResponseData->responseExtensions, val,
387                           len);
388}
389
390/*-
391 * Check nonce validity in a request and response.
392 * Return value reflects result:
393 *  1: nonces present and equal.
394 *  2: nonces both absent.
395 *  3: nonce present in response only.
396 *  0: nonces both present and not equal.
397 * -1: nonce in request only.
398 *
399 *  For most responders clients can check return > 0.
400 *  If responder doesn't handle nonces return != 0 may be
401 *  necessary. return == 0 is always an error.
402 */
403
404int OCSP_check_nonce(OCSP_REQUEST *req, OCSP_BASICRESP *bs)
405{
406    /*
407     * Since we are only interested in the presence or absence of
408     * the nonce and comparing its value there is no need to use
409     * the X509V3 routines: this way we can avoid them allocating an
410     * ASN1_OCTET_STRING structure for the value which would be
411     * freed immediately anyway.
412     */
413
414    int req_idx, resp_idx;
415    X509_EXTENSION *req_ext, *resp_ext;
416    req_idx = OCSP_REQUEST_get_ext_by_NID(req, NID_id_pkix_OCSP_Nonce, -1);
417    resp_idx = OCSP_BASICRESP_get_ext_by_NID(bs, NID_id_pkix_OCSP_Nonce, -1);
418    /* Check both absent */
419    if ((req_idx < 0) && (resp_idx < 0))
420        return 2;
421    /* Check in request only */
422    if ((req_idx >= 0) && (resp_idx < 0))
423        return -1;
424    /* Check in response but not request */
425    if ((req_idx < 0) && (resp_idx >= 0))
426        return 3;
427    /*
428     * Otherwise nonce in request and response so retrieve the extensions
429     */
430    req_ext = OCSP_REQUEST_get_ext(req, req_idx);
431    resp_ext = OCSP_BASICRESP_get_ext(bs, resp_idx);
432    if (ASN1_OCTET_STRING_cmp(req_ext->value, resp_ext->value))
433        return 0;
434    return 1;
435}
436
437/*
438 * Copy the nonce value (if any) from an OCSP request to a response.
439 */
440
441int OCSP_copy_nonce(OCSP_BASICRESP *resp, OCSP_REQUEST *req)
442{
443    X509_EXTENSION *req_ext;
444    int req_idx;
445    /* Check for nonce in request */
446    req_idx = OCSP_REQUEST_get_ext_by_NID(req, NID_id_pkix_OCSP_Nonce, -1);
447    /* If no nonce that's OK */
448    if (req_idx < 0)
449        return 2;
450    req_ext = OCSP_REQUEST_get_ext(req, req_idx);
451    return OCSP_BASICRESP_add_ext(resp, req_ext, -1);
452}
453
454X509_EXTENSION *OCSP_crlID_new(char *url, long *n, char *tim)
455{
456    X509_EXTENSION *x = NULL;
457    OCSP_CRLID *cid = NULL;
458
459    if (!(cid = OCSP_CRLID_new()))
460        goto err;
461    if (url) {
462        if (!(cid->crlUrl = ASN1_IA5STRING_new()))
463            goto err;
464        if (!(ASN1_STRING_set(cid->crlUrl, url, -1)))
465            goto err;
466    }
467    if (n) {
468        if (!(cid->crlNum = ASN1_INTEGER_new()))
469            goto err;
470        if (!(ASN1_INTEGER_set(cid->crlNum, *n)))
471            goto err;
472    }
473    if (tim) {
474        if (!(cid->crlTime = ASN1_GENERALIZEDTIME_new()))
475            goto err;
476        if (!(ASN1_GENERALIZEDTIME_set_string(cid->crlTime, tim)))
477            goto err;
478    }
479    if (!(x = X509_EXTENSION_new()))
480        goto err;
481    if (!(x->object = OBJ_nid2obj(NID_id_pkix_OCSP_CrlID)))
482        goto err;
483    if (!(ASN1_STRING_encode_of(OCSP_CRLID, x->value, i2d_OCSP_CRLID, cid,
484                                NULL)))
485         goto err;
486    OCSP_CRLID_free(cid);
487    return x;
488 err:
489    if (x)
490        X509_EXTENSION_free(x);
491    if (cid)
492        OCSP_CRLID_free(cid);
493    return NULL;
494}
495
496/*   AcceptableResponses ::= SEQUENCE OF OBJECT IDENTIFIER */
497X509_EXTENSION *OCSP_accept_responses_new(char **oids)
498{
499    int nid;
500    STACK_OF(ASN1_OBJECT) *sk = NULL;
501    ASN1_OBJECT *o = NULL;
502    X509_EXTENSION *x = NULL;
503
504    if (!(sk = sk_ASN1_OBJECT_new_null()))
505        goto err;
506    while (oids && *oids) {
507        if ((nid = OBJ_txt2nid(*oids)) != NID_undef && (o = OBJ_nid2obj(nid)))
508            sk_ASN1_OBJECT_push(sk, o);
509        oids++;
510    }
511    if (!(x = X509_EXTENSION_new()))
512        goto err;
513    if (!(x->object = OBJ_nid2obj(NID_id_pkix_OCSP_acceptableResponses)))
514        goto err;
515    if (!(ASN1_STRING_encode_of(ASN1_OBJECT, x->value, i2d_ASN1_OBJECT, NULL,
516                                sk)))
517         goto err;
518    sk_ASN1_OBJECT_pop_free(sk, ASN1_OBJECT_free);
519    return x;
520 err:
521    if (x)
522        X509_EXTENSION_free(x);
523    if (sk)
524        sk_ASN1_OBJECT_pop_free(sk, ASN1_OBJECT_free);
525    return NULL;
526}
527
528/*  ArchiveCutoff ::= GeneralizedTime */
529X509_EXTENSION *OCSP_archive_cutoff_new(char *tim)
530{
531    X509_EXTENSION *x = NULL;
532    ASN1_GENERALIZEDTIME *gt = NULL;
533
534    if (!(gt = ASN1_GENERALIZEDTIME_new()))
535        goto err;
536    if (!(ASN1_GENERALIZEDTIME_set_string(gt, tim)))
537        goto err;
538    if (!(x = X509_EXTENSION_new()))
539        goto err;
540    if (!(x->object = OBJ_nid2obj(NID_id_pkix_OCSP_archiveCutoff)))
541        goto err;
542    if (!(ASN1_STRING_encode_of(ASN1_GENERALIZEDTIME, x->value,
543                                i2d_ASN1_GENERALIZEDTIME, gt, NULL)))
544         goto err;
545    ASN1_GENERALIZEDTIME_free(gt);
546    return x;
547 err:
548    if (gt)
549        ASN1_GENERALIZEDTIME_free(gt);
550    if (x)
551        X509_EXTENSION_free(x);
552    return NULL;
553}
554
555/*
556 * per ACCESS_DESCRIPTION parameter are oids, of which there are currently
557 * two--NID_ad_ocsp, NID_id_ad_caIssuers--and GeneralName value.  This method
558 * forces NID_ad_ocsp and uniformResourceLocator [6] IA5String.
559 */
560X509_EXTENSION *OCSP_url_svcloc_new(X509_NAME *issuer, char **urls)
561{
562    X509_EXTENSION *x = NULL;
563    ASN1_IA5STRING *ia5 = NULL;
564    OCSP_SERVICELOC *sloc = NULL;
565    ACCESS_DESCRIPTION *ad = NULL;
566
567    if (!(sloc = OCSP_SERVICELOC_new()))
568        goto err;
569    if (!(sloc->issuer = X509_NAME_dup(issuer)))
570        goto err;
571    if (urls && *urls && !(sloc->locator = sk_ACCESS_DESCRIPTION_new_null()))
572        goto err;
573    while (urls && *urls) {
574        if (!(ad = ACCESS_DESCRIPTION_new()))
575            goto err;
576        if (!(ad->method = OBJ_nid2obj(NID_ad_OCSP)))
577            goto err;
578        if (!(ad->location = GENERAL_NAME_new()))
579            goto err;
580        if (!(ia5 = ASN1_IA5STRING_new()))
581            goto err;
582        if (!ASN1_STRING_set((ASN1_STRING *)ia5, *urls, -1))
583            goto err;
584        ad->location->type = GEN_URI;
585        ad->location->d.ia5 = ia5;
586        if (!sk_ACCESS_DESCRIPTION_push(sloc->locator, ad))
587            goto err;
588        urls++;
589    }
590    if (!(x = X509_EXTENSION_new()))
591        goto err;
592    if (!(x->object = OBJ_nid2obj(NID_id_pkix_OCSP_serviceLocator)))
593        goto err;
594    if (!(ASN1_STRING_encode_of(OCSP_SERVICELOC, x->value,
595                                i2d_OCSP_SERVICELOC, sloc, NULL)))
596         goto err;
597    OCSP_SERVICELOC_free(sloc);
598    return x;
599 err:
600    if (x)
601        X509_EXTENSION_free(x);
602    if (sloc)
603        OCSP_SERVICELOC_free(sloc);
604    return NULL;
605}
606